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WO2019106829A1 - Display unit, display device and display method - Google Patents

Display unit, display device and display method Download PDF

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Publication number
WO2019106829A1
WO2019106829A1 PCT/JP2017/043278 JP2017043278W WO2019106829A1 WO 2019106829 A1 WO2019106829 A1 WO 2019106829A1 JP 2017043278 W JP2017043278 W JP 2017043278W WO 2019106829 A1 WO2019106829 A1 WO 2019106829A1
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WO
WIPO (PCT)
Prior art keywords
display
current
black image
abnormality
unit
Prior art date
Application number
PCT/JP2017/043278
Other languages
French (fr)
Japanese (ja)
Inventor
正英 小池
順司 助野
山田　和彦
敏明 花村
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2019556513A priority Critical patent/JP6679203B2/en
Priority to PCT/JP2017/043278 priority patent/WO2019106829A1/en
Priority to CN201780097194.3A priority patent/CN111406279B/en
Publication of WO2019106829A1 publication Critical patent/WO2019106829A1/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]

Definitions

  • the present invention relates to a display unit capable of controlling current flowing in each of LEDs (Light Emitting Diodes) arranged in a matrix on a flat surface, a display device using the display unit, and a display method of the display unit.
  • LEDs Light Emitting Diodes
  • the LED type large image display device forms a screen by arranging a large number of LEDs on a plane, and displays an image by changing the luminance of each LED.
  • color display of images is realized by using red, green and blue LEDs.
  • the control of the brightness of the LED is implemented by changing the magnitude of the current flowing to the LED.
  • the current value is 0, the LED is black in the light-off state, and the larger the current, the brighter the light.
  • a drive circuit is used for current control.
  • Drive circuits are required for each of the LEDs. Although it is possible to configure the drive circuit by combining electronic components, since current control of a large number of LEDs is required, generally, an IC (Integrated Circuit) mounted with the drive circuit is used.
  • the large image display apparatus is in operation all day, and it may be difficult to turn off the power and maintain it. In places where maintenance is difficult, abnormality detection and automatic recovery in an operating state are required.
  • the cause of the phenomenon that can be recovered by turning off the power once is considered to be the latch-up phenomenon of the LED drive circuit.
  • the latch-up is a state in which the semiconductor element remains uncontrollable with the on state and current continues to flow, and occurs when a voltage higher than the rated voltage is input to the semiconductor element due to noise, static electricity or the like. In order to recover from the latch-up state, the power supply to the semiconductor element in the latch-up state needs to be stopped once and supplied again.
  • Patent Document 1 When abnormality generate
  • Patent Document 2 a technique for determining a failure state of a light emitting device by comparing a luminance calculation value calculated from video data to be displayed on a large display panel with the measured luminance value.
  • the luminance is measured because the abnormality is detected by measuring the luminance of all the light emitting devices and comparing the luminance calculation value calculated from the video data with the measured luminance value. Needs a luminance measuring device to measure the luminance of all the light emitting devices.
  • a display unit comprises: an image receiving means for receiving image data; and a light emitting element portion comprising a plurality of light emitting elements arranged in a matrix on a plane for displaying an image based on the image data by light emission;
  • a display control means for generating a luminance control signal for controlling the luminance of each of the light emitting elements based on the video data;
  • a driving means for driving each of the light emitting elements based on the luminance control signal;
  • the image data is determined to be a black image by the black image determination means for performing the black image determination, the current detection means for detecting the current value I of the current flowing from the power source to the light emitting element portion, In the case where the display abnormality is detected, the display abnormality of the light emitting element portion is detected based on the current value I B of the current flowing during the black image display period, which is detected by the current detection means.
  • the detection means and the display abnormality detection means do not detect display abnormality, the power supply to the drive means is continued, and when the
  • a display device includes a display panel in which a plurality of display units are arranged in a matrix, a power supply unit for supplying power to the display units, and power supply from the power supply unit to the display units. And display unit control means for controlling.
  • the display method comprises the steps of receiving video data, and based on the video data, with respect to a plurality of light emitting elements arranged in a matrix on the plane of the light emitting element unit, Generating a luminance control signal for controlling; driving each of the light emitting elements by a driving unit based on the luminance control signal; detecting a current value flowing to the light emitting element portion; and performing a black image determining data, the steps of the image data is compared with the abnormality determination threshold current I TH1 current value I B of the current flowing to the light emitting element section when it is determined that the black image, the If the current value I B above the abnormality judgment threshold current I TH1, a step of a predetermined time stopping the power supply to the drive means by the power control means, after the predetermined time Resuming the supply of power to the drive means by the power control means after a failure.
  • the display abnormality detection unit can detect the display abnormality, and when the display abnormality is detected, the power control circuit controls the power supply to the drive circuit to display It is possible to recover from an abnormality.
  • the display device when display abnormality occurs in the display unit, the power supply of only the display unit in which the display abnormality occurs is stopped and turned on again. It is not necessary to shut down the power supply of the whole, and the display unit in which the display abnormality has not occurred can continue the display operation.
  • the display abnormality detection unit can detect the display abnormality, and when the display abnormality is detected, the power supply control circuit controls the power supply to the drive circuit to display It is possible to recover from an abnormality.
  • FIG. 6 is a timing diagram of power supply OFF control to the drive circuit at the time of display abnormality detection in the display unit according to Embodiment 1 of the present invention.
  • FIG. 5 is a control flow diagram of display abnormality detection in the display unit according to Embodiment 1 of the present invention.
  • FIG. 1 is a block diagram showing a configuration of a display device according to Embodiment 1 of the present invention.
  • FIG. 1 is a block diagram schematically showing a configuration of a display unit 100 according to the first embodiment.
  • the display unit 100 is a device for displaying an image such as various information, live broadcast images of competitions and advertisement images on, for example, public facilities, stadiums, and wall surfaces of buildings, and is a basic unit constituting a screen for displaying the images. Is a unit that The display unit 100 is a unit in which about 2000 LEDs are arranged on a plane, and a large number of display units 100 are arranged in a two-dimensional matrix to form one screen.
  • the display unit 100 displays an image by controlling the luminance of each LED on the display unit 100 according to the image data.
  • the display unit 100 is a light emission composed of a video reception circuit 101, a display control circuit 102, a drive circuit 103, and a plurality of LEDs 114 (light emitting elements) arranged in a matrix on a plane.
  • An element unit 104, a current detection unit 105, a black image determination circuit 106, a display abnormality detection unit 107, and a power control circuit 108 are provided.
  • the video reception circuit 101 externally receives video data to be displayed by the display unit 100, and outputs the video data to the display control circuit 102 and the black image determination circuit 106.
  • the display control circuit 102 performs display control by generating a brightness control signal for individually controlling the brightness of each of the LEDs 114 that constitute the light emitting element unit 104 based on the video data output from the video receiving circuit 101.
  • the drive circuit 103 drives each of the LEDs 114 that constitute the light emitting element unit 104 based on the luminance control signal generated by the display control circuit 102.
  • the LED 114 displays an image based on the image data by emitting light.
  • FIG. 2 is a diagram showing the configuration of the LED 114 described above.
  • FIG. 2 shows a configuration in which one LED 114 includes three LED light sources 114a, 114b and 114c.
  • the LED light source 114a emits red light
  • the LED light source 114b emits green light
  • the LED light source 114c emits blue light.
  • FIG. 2 shows a configuration in which a plurality of LEDs 114 including three LED light sources 114a, 114b and 114c are arranged
  • the number of LED light sources included in LED 114 is not limited to three.
  • LEDs 114 capable of emitting three colors in the display unit 100 LEDs emitting light of red, green and blue individually may be arranged in a matrix on a plane.
  • FIG. 3 is a view showing the appearance of the display unit 100 according to the first embodiment.
  • LEDs 114 for displaying an image are arranged in a matrix on a plane. For example, 30 LEDs are arranged in the horizontal direction on the display unit 100, and 20 LEDs are arranged in the vertical direction.
  • the current detection unit 105 detects the current of the power supplied to each LED 114.
  • the black image determination circuit 106 determines whether the video data output from the video reception circuit 101 is a black image.
  • the display abnormality detection unit 107 detects an image display abnormality based on the current value detected by the current detection unit 105 when the black image determination circuit 106 determines that the video data is a black image.
  • the power supply control circuit 108 supplies power to the drive circuit 103 in accordance with the detection of display abnormality by the display abnormality detection unit 107.
  • the video reception circuit 101 receives video data to be displayed on the display unit 100 from the terminal 112, and outputs the video data to the display control circuit 102.
  • the image data displayed on the 600 LEDs 114 is received.
  • each of the LEDs 114 includes three LED light sources, image data to be displayed on the 1800 LED light sources is received.
  • the video data includes information on the respective luminance when emitting light of 1800 LED light sources.
  • the video data receives, for example, a signal sent as a complementary metal oxide semiconductor (CMOS) or low voltage differential signaling (LVDS) electrical signal, and outputs the signal as a CMOS electrical signal.
  • CMOS complementary metal oxide semiconductor
  • LVDS low voltage differential signaling
  • the display control circuit 102 performs display control in accordance with the video data output from the video receiving circuit 101.
  • the display control circuit 102 performs video display by controlling the luminance of each LED 114 in accordance with the information on light emission included in the video data.
  • the display control circuit 102 generates a brightness control signal corresponding to each LED 114 in order to control the brightness of each LED 114.
  • the control of the luminance is performed, for example, by PWM (Pulse Width Modulation).
  • FIG. 4 is an explanatory diagram of PWM, which is one of modulation methods in the display unit 100 according to the first embodiment.
  • PWM is a method of controlling the output by the width of ON and OFF of the signal as shown in FIG. 4, and is always ON when emitting the brightest light and always OFF when not emitting the light. From the always OFF state, as the ON period is increased, the light is emitted more brightly.
  • the drive circuit 103 drives each of the LEDs 114 based on the luminance control signal generated by the display control circuit 102.
  • the drive circuit 103 receives the luminance control signal output from the display control circuit 102, and controls the light emission by causing a current to flow to the LED 114 based on the luminance control signal.
  • the drive circuit 103 is, for example, a current drive circuit capable of turning on and off a fixed current value.
  • the drive circuit 103 supplies a current having a predetermined current value to the LED 114, and when the brightness control signal indicates the OFF state, the drive circuit 103.
  • the drive circuit 103 controls the light emission of the LED 114 by setting the magnitude of the current supplied to the LED 114 to zero.
  • the current value of the current flowed when the luminance control signal indicates the ON state is the current value at which the LED 114 emits the brightest light.
  • the light emitting element unit 104 emits light and displays an image according to light emission control by the drive circuit 103.
  • the light emitting element portion 104 is composed of a plurality of LEDs 114 arranged in a matrix on a plane.
  • the display control circuit 102 controls the luminance by PWM
  • the light emitting element unit 104 lights up when the driving circuit 103 supplies a current having a predetermined current value to the light emitting element unit 104. It will be in the In addition, the light emitting element portion 104 is turned off when the magnitude of the current supplied from the driving circuit 103 to the light emitting element portion 104 is zero.
  • the luminance of the light emitting element portion 104 is determined by the temporal ratio of the lighting state and the lighting off state.
  • the current detection unit 105 detects the current of the power supplied to each LED 114.
  • FIG. 5 is a block diagram showing an example of the configuration of current detection unit 105 in display unit 100.
  • the current detection unit 105 includes a current-voltage conversion unit 501, a first amplification unit 502, a voltage limiting unit 503, a second amplification unit 504, and an analog-digital conversion unit 505. .
  • the current-voltage conversion unit 501 converts the current value of the current flowing from the power supply into a voltage value.
  • the current-voltage converter 501 is realized by a small resistor of about 10 milliohms.
  • the resistor for detecting the magnitude of the current is called a shunt resistor.
  • the power supplied from the terminal 506 passes through the current-voltage converter 501, is output from the terminal 507, and is supplied to each part of the display unit 100. Further, the obtained voltage value is output from the current-voltage conversion unit 501 to the first amplification unit 502. Assuming that the resistance value of the shunt resistor is R and the magnitude of the current is I, the current-voltage conversion unit 501 outputs a voltage value (I ⁇ R).
  • the first amplification unit 502 amplifies the voltage output from the current-voltage conversion unit 501 to calculate an amplification voltage value VA , and outputs the amplification voltage value VA to the voltage restriction unit 503.
  • the first amplification unit 502 is realized by an operational amplifier, for example.
  • Voltage limiting section 503 to amplified voltage value V A of the first amplifying unit 502 is output, calculates the limit voltage V R by cutting a predetermined threshold voltage V TH over voltage, the second The signal is output to the amplification unit 504.
  • the reason for calculating the threshold voltage V TH or more cuts to limit voltage V R the voltage is because the cut voltage of the unnecessary range in the display abnormality determination of the black image, to improve the accuracy of determination of the abnormal display is there.
  • the voltage limiting unit 503 is realized by, for example, a diode and an operational amplifier.
  • the predetermined threshold voltage V TH is, for example, a voltage value corresponding to 20 (mA) which is a current value flowing when one LED 114 emits the brightest light.
  • the second amplifying unit 504 calculates the amplification limit voltage value V RA amplifies the limit voltage V R the voltage limiting section 503 is calculated, and output to an analog-digital converter 505.
  • the second amplification unit 504 is realized by, for example, an operational amplifier.
  • the analog-to-digital converter 505 converts the amplification limited voltage value VRA output from the second amplification unit 504 from an analog value to a digital value, and converts the voltage value to a current value to calculate the current value I. Output to the terminal 508.
  • the analog-to-digital converter 505 is realized by, for example, an A / D converter (Analog-to-Digital converter).
  • the current detection unit 105 outputs the current value I output from the analog-to-digital converter 505 from the terminal 508 as a current detection result.
  • the relationship between the voltage values shown by circles is when the voltage P2 output from the first amplification unit 502 exceeds the threshold voltage V TH , and the relationship between the voltage values shown by triangles is the first. This is the case where the voltage P2 output from the amplification unit 502 does not exceed the threshold voltage V TH .
  • the threshold voltage V TH is 20 (mA) ⁇ (resistance value R)
  • a fourth voltage value can be obtained in any case of the voltage values shown by circles and triangles.
  • the current detection unit 105 when the accuracy of the analog-to-digital converter 505 is high, the voltage limiting unit 503 and the second amplification unit 504 may not be provided. In this case, since the number of parts can be reduced, the cost can be further reduced.
  • FIG. 7 is an explanatory diagram of display abnormality detection of the LED 114 in the display unit 100 according to the first embodiment.
  • FIG. 7A when all the LEDs 114 are turned on and a current of about 36 A at maximum flows, an abnormality occurs in one of the LED light sources in one LED 114 at time t. In the case where only one is turned off constantly, it is necessary to detect a fluctuation of 20 (mA) with respect to a current value of about 36 A, and display abnormality detection is difficult.
  • the black image determination circuit 106 determines whether the video data received and output by the video reception circuit 101 is a black image, and outputs a black image determination result.
  • the black image is a state in which all the LEDs 114 of the display unit 100 are off or close thereto.
  • the black image determination circuit 106 determines that the received image data is a black image when the values of the brightness control signals for all the LEDs 114 are less than or equal to a predetermined threshold value.
  • the black image determination circuit 106 determines that the image is a black image, for example, when all the values of the brightness control signals for all the LEDs 114 in the received video data are in the OFF state.
  • the display abnormality detector 107 When the video data is determined as the black image by a black image determining circuit 106, when the value of the current flowing from the power source to each LED114 and I B, the display abnormality detector 107, the display abnormality in the signal using the current value I B Perform detection.
  • An example of the configuration of the display abnormality detection unit 107 is shown in FIG. In the configuration of FIG. 8, the display abnormality detection unit 107 includes an average value calculation unit 801, a standard deviation calculation unit 802, a threshold current calculation unit 803, a threshold current storage unit 804, and a display abnormality determination unit 805.
  • the display abnormality detection unit 107 can be realized using, for example, a CPU, a microcomputer, or the like.
  • the average value calculation unit 801 indicates that the determination of the black image determination circuit 106 input from the terminal 806 indicates a black image when the determination of the black image determination circuit 106 input from the terminal 808 indicates a black image.
  • a current average value of the current value I B which is a current flowing in a period is calculated, and the average of the current value I B is output to the threshold current calculation unit 803.
  • the current average value of the current value I B is set to I MN1 .
  • the standard deviation calculation unit 802 calculates the standard deviation of the current value I B input from the terminal 806 when the determination of the black image determination circuit 106 input from the terminal 808 indicates a black image, and the current value I The standard deviation of B is output to the threshold current calculation unit 803.
  • the standard deviation of the current value I B is I SD1 .
  • the threshold current calculation unit 803 obtains an abnormality determination threshold current from the current average value I MN1 output from the average value calculation unit 801 and the standard deviation I SD1 output from the standard deviation calculation unit 802, and sends the result to the threshold current storage unit 804. Output.
  • the abnormality determination threshold current is I TH1
  • the abnormality determination threshold current I TH1 is obtained by the following equation (1).
  • I TH1 I MN1 + (I SD1 ⁇ 3) (1)
  • the current value I B when the determination of the black image determination circuit 106 input from the terminal 808 indicates a black image falls within the range of the distribution of the normal current value at the time of the black image. It is possible to obtain a threshold current for determining the presence or absence.
  • the threshold current storage unit 804 stores the abnormality determination threshold current I TH1 output from the threshold current calculation unit 803.
  • the calculation of the abnormality determination threshold current I TH1 is performed when there is a threshold current update instruction from the terminal 807.
  • a threshold current update instruction from the terminal 807 for example, a test image is displayed at the time of installation of a large image display device, and an instruction is issued only once at the end of the test, whereby no abnormality occurs.
  • the abnormality determination threshold current I TH1 can be obtained and stored from the current value at the time of black image display in the state.
  • the initial value of the threshold current storage unit 804 before the installation of the large image display apparatus is, for example, ⁇ 1 (A) so that the initial value can be known.
  • the display abnormality determination unit 805 displays the abnormality determination threshold current I TH1 stored in the threshold current storage unit 804 and the terminal 806.
  • the input current value I B is compared. If the current value I B is greater than or abnormality judgment threshold current I TH1, for detecting the abnormal display occurs, and outputs it to the terminal 809 as there abnormal display.
  • the current value I B is less than the abnormality determination threshold current I TH1 , the occurrence of display abnormality is not detected, and therefore, the display abnormality is not generated and is output to the terminal 809.
  • the display abnormality detection unit 107 can detect a display abnormality. Further, since the display abnormality is determined only by the simple comparison, it can be easily realized.
  • the power supply control circuit 108 supplies power to the drive circuit 103 in accordance with the detection of display abnormality by the display abnormality detection unit 107. If the display abnormality detection unit 107 does not detect a display abnormality, the power supply control circuit 108 continues the supply of power to the drive circuit 103 of the display unit 100. When the display abnormality detection unit 107 detects a display abnormality, the power supply control circuit 108 stops the power supply to the drive circuit 103 of the display unit 100 for a certain period of time. The time for stopping the power supply varies depending on the light emitting element used, but is, for example, on the order of one second, and the power supply to the LED 114 is completely stopped.
  • the power control circuit 108 resumes the power supply to the drive circuit 103 of the display unit 100. Therefore, when a display abnormality occurs due to the latch-up phenomenon, the power supply to the drive circuit 103 of the display unit 100 is stopped, and after a predetermined time elapses, the power supply to the drive circuit 103 of the display unit 100 is resumed. Thus, it is possible to recover from the display abnormality caused by the latch-up phenomenon.
  • FIG. 9 is a timing diagram of display abnormality detection at the time of black image display and control of stopping power supply to the drive circuit 103 at the time of display abnormality detection in the display unit 100 according to the first embodiment.
  • a section in which the determination of the black image determination circuit 106 input from the terminal 808 indicates a black image is B1 to B2 and B3 to B4, and when the abnormality determination threshold current is I TH1 , in the section B1 to B2 Since the current value is less than the abnormality determination threshold current I TH1 , no display abnormality is detected. On the other hand, since the current value is equal to or greater than the abnormality determination threshold current I TH1 in the section B3 to B4, display abnormality is detected.
  • a display abnormality detection method of display unit 100 according to the first embodiment will be described using a control flow diagram shown in FIG.
  • the current detection unit 105 detects the current value of the current flowing through the light emitting element unit 104 in step S1.
  • step S2 the black image determination circuit 106 determines whether the video data when the current is detected in step S1 is a black image. If the video data is determined to be a black image, the process proceeds to step S3, and if it is determined that the video data is not a black image, the process proceeds to step S1.
  • step S3 when the black image determination circuit 106 determines that the video data is a black image by the display abnormality detection unit 107, the current value I B of the current flowing to the light emitting element unit detected by the current detection unit 105 is Whether or not the abnormality determination threshold current I TH1 or more is compared. If the current value I B was the abnormality judgment threshold current I TH1 or proceeds to step S4, if the current value I B below abnormality judgment threshold current I TH1 proceeds to step S1.
  • step S4 the power supply control circuit 108 stops the power supply to the drive circuit 103.
  • step S5 the stop of the power supply to the drive circuit 103 by the power supply control circuit 108 is continued until a predetermined time passes.
  • step S6 after the power supply to the drive circuit 103 by the power supply control circuit 108 is stopped and a predetermined time has elapsed, the power supply control circuit 108 resumes the power supply to the drive circuit 103.
  • step S6 After the process of step S6, the process proceeds to step S1.
  • FIG. 11 is a block diagram showing the configuration of the display device 1 according to the first embodiment.
  • the display panel 11 is configured by arranging a plurality of display units 100 in a two-dimensional matrix.
  • the display device 1 is connected to a power supply unit 12 for supplying power to each display unit 100, and the power supply to each display unit 100 is controlled by a display unit control circuit 13.
  • the display abnormality detection unit 107 can detect a display abnormality, and when the display abnormality is detected, the power of the display unit 100 in which the display abnormality has occurred is turned off. Without the power supply of the drive circuit 103 only, it is possible to recover by turning it on again.
  • the display unit 100 when a display abnormality occurs in the display unit 100, the display unit 100 is configured from a large number of display units 100 in order to stop the power supply of only the display unit 100 in which the display abnormality occurs. It is not necessary to stop the entire power supply of the display device 1 to be displayed, and the display unit 100 in which no display abnormality has occurred can continue the display operation.
  • the display abnormality is detected using the current detection unit 105, an effect of eliminating the need for a luminance measuring device for measuring the luminance of the light emitting device can be obtained. Furthermore, in order to detect the display abnormality by detecting the current of the entire display unit 100, when detecting the current value of the current flowing to each LED 114, the current value of the current flowing to each drive circuit 103 is individually detected. The number of current detection units 105 can be reduced as compared to the case of the above, and cost reduction of the apparatus can be realized.
  • the display abnormality detection unit 107 can detect the display abnormality. Further, when the display abnormality is detected, the power to the drive circuit 103 is detected by the power control circuit 108. It becomes possible to control supply and to recover from display abnormalities.
  • the display unit 200 according to the second embodiment is configured to input the black image determination result output from the black image determination circuit 106 not only to the display abnormality detection unit 107 but also to the current detection unit 201.
  • the configuration of the display unit 200 according to the second embodiment is shown in FIG. The description of the same or corresponding configuration and operation as the first embodiment will be omitted, and only parts different from the first embodiment in configuration and operation will be described.
  • FIG. 13 is a block diagram showing the configuration of the current detection unit 201 in the display unit 200 according to the second embodiment.
  • the current detection unit 201 has a configuration in which an averaging unit 509 and a terminal 510 are added to the current detection unit 105 shown in FIG. 5.
  • the terminal 510 inputs the black image determination result output from the black image determination circuit 106.
  • the averaging unit 509 When the averaging unit 509 indicates that the black image determination result input from the terminal 510 is a black image, the averaging unit 509 calculates a current average value of the current value I B output from the analog-to-digital converter 505, and the current The current average value I BMN of the detection result is output to the terminal 508.
  • the current detection unit 201 outputs the current average value IBMN of the current detection result output from the averaging unit 509 from the terminal 508.
  • the display abnormality detection unit 107 in the display unit 200 compares the current average value I BMN with the abnormality determination threshold current I TH1 calculated by the method described in the first embodiment. To detect
  • FIG. 14 is a diagram showing an example of the timing.
  • the average value of the current value I B is determined for the ranges of the sections a, b, and c which are black images during the average value calculation cycle T1, and the averaging process is performed.
  • the current average value I BMN of the current detection result is output to a terminal 508.
  • the current average value of the current value I B is determined for the range of the sections d and e which are black images during the next average value calculation cycle T1, and the averaging process is performed on the current detection result.
  • Current average value I BMN is output to terminal 508.
  • the averaging unit 509 obtains the current average value of the current value I B for the section which is a black image during the average value calculation cycle T1, and the current average of the current detection result obtained by performing the averaging process.
  • the value I BMN is output to terminal 508. Therefore, even when the black image does not continue, it is possible to detect the display abnormality with high accuracy.
  • the average value calculation cycle T1 can be set at an arbitrary time. It is possible to further reduce the influence of noise by setting the average value calculation cycle T1 longer, but if it is too long, the display abnormality will be continued. Is desirable.
  • FIG. 15 is a diagram showing noise-like current fluctuation in the drive circuit 103 in the display unit 200 according to the second embodiment, in a section which is a black image during the average value calculation cycle T1 of FIG. It shows current fluctuation.
  • Q in FIG. 15 indicates a noise-like current fluctuation in the drive circuit 103.
  • the current value is applied to the section which is a black image by the averaging unit 509 of the current detection unit 201. executing an averaging process of I B.
  • the averaging process makes it possible to reduce the influence of current fluctuations.
  • the averaging unit 509 can be realized using, for example, a CPU, a microcomputer, or the like.
  • the current detection unit 201 when the black image determination result input from the terminal 510 indicates that the image is a black image, the current detection unit 201 performs the averaging process on the current detection result terminal. Since the output can be made from 508, the influence of the noise-like current fluctuation on the current detection can be suppressed, and accurate abnormal state detection can be performed.
  • the display unit 300 according to the third embodiment has a configuration in which a black image switching circuit 301 is added to the display unit 100 according to the first embodiment.
  • the configuration of the video input circuit 301 is shown in FIG. The description of the same or corresponding configurations and operations as those of the first and second embodiments will be omitted, and only portions different from the first and second embodiments in the configurations and operations will be described.
  • the black image switching circuit 301 displays black image data corresponding to black image display instead of the video data output from the video reception circuit 101 during a period instructed to the black image by the black image switching instruction input from the terminal 302. It is output to the control circuit 102 and the black image determination circuit 106.
  • the black image switching instruction is not input, the video data output from the video receiving circuit 101 is output to the display control circuit 102 and the black image determination circuit 106.
  • the black image switching instruction input from the terminal 302 is performed when a black image is displayed on the entire surface of the image displayed on the display panel 11 by display switching or the like.
  • a black image is explicitly displayed when the entire image displayed on the display device 1 becomes a black image due to display switching or the like, so that the display image does not have a sense of discomfort.
  • the current value flowing due to the display abnormality of the display unit 300 can be detected more accurately, and the processing for obtaining the abnormality determination threshold current in the display abnormality detection unit 107 can be performed efficiently. Therefore, the abnormality judgment of the display abnormality detection of each display unit 300 of the display device 1 can be performed more accurately and efficiently.
  • a black image switching instruction to the black image switching circuit 301 of the display unit 300 according to the third embodiment is input from the black image determination circuit 106.
  • the configuration of a display unit 400 according to the fourth embodiment is shown in FIG. The description of the same or corresponding configurations and operations as the first, second, and third embodiments will be omitted, and only portions different from the first, second, and third embodiments in configuration and operation will be described.
  • FIG. 17 is a diagram showing the configuration of a display unit 400 according to the fourth embodiment.
  • the black image plane switching circuit 401 displays black image data corresponding to black image display instead of the video data output from the video reception circuit 101. Output to 102.
  • a black image is explicitly displayed to detect a display abnormality when the entire image displayed on the display device 1 becomes a black image due to display switching or the like.
  • the black image judgment circuit 106 judges the black image
  • the black image is explicitly displayed to detect the display abnormality.
  • the black image plane switching circuit 401 may be operated only for several hours a day, for example, by a timer or the like.
  • the black image is explicitly displayed based on the black image determination for each display unit. Therefore, the third embodiment can be performed even when the entire display of the display device 1 is not the black image. It produces the same effect as
  • Embodiment 5 The display device 2 according to the fifth embodiment has a configuration in which the display units 300 described in the third embodiment are arranged in a matrix on a plane.
  • the configuration of the display device 2 according to the fifth embodiment is shown in FIG.
  • the display unit 300 is arranged in a matrix on a plane to configure the display panel 21.
  • the description of the same or corresponding configuration and operation as the first, second, third, and fourth embodiments will be omitted, and only the portions different in the configuration and the operation from the first, second, third, and fourth embodiments will be described. .
  • the display unit control circuit 13 sequentially outputs a black image switching instruction to each display unit 300 every fixed period, and the video data output from the video reception circuit 101 Instead of the black image data corresponding to the black image display is displayed.
  • indication can be determined according to the installation place of the display apparatus 5, etc.
  • the timing at which the black image switching instruction is sequentially output to each display unit 300 can be determined according to the installation place of the display device 5 or the like.
  • a black image display is displayed instead of the video data output from the video reception circuit 101 in order to sequentially output a black image switching instruction to each display unit 300 for each fixed period.
  • Black image data corresponding to Y. can be displayed, and abnormal display can be detected even when black image display does not occur for a long time.
  • the output timing of the black image switching instruction to each display unit 300 can be determined according to the installation situation of the display device 2, it is possible to minimize the discomfort given to the display image.
  • the light emitting element constituting the light emitting element portion 104 has been described using an LED as an example, but another light emitting element such as an organic EL element may be used.
  • the present invention is not limited to the shapes described in the first to fifth embodiments, and the embodiments can be freely combined within the scope of the invention, and the embodiments can be appropriately modified, It is possible to omit.

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Abstract

Provided is a display unit which is capable of controlling a current flowing through each light emitting element. The display unit 100 is provided with: an image receiving means 101 which receives image data; a light emitting element part 104 which is composed of a plurality of light emitting elements that display the image by means of light emission; a display control means 102 which generate a luminance control signal for controlling a luminance of each light emitting element part; a driving means 103 which drives each light emitting element; a black image determination means 106 which performs black image determination; a current detection means 105 which detects a current flowing to the light emitting element part 104; a display abnormality detection means 107 which detects a display abnormality on the basis of a current value IB of a current flowing during a black image display period, when it is determined to be the black image by the black image determination means 106; and a power supply control means 108 which continues supplying power to the driving means 103, when the display abnormality is not detected, and which stops supplying power to the driving means 103 for a certain time and then restarts the supplying power, when the display abnormality is detected.

Description

表示ユニット、表示装置及び表示方法Display unit, display device and display method
　平面上にマトリクス状に配置したＬＥＤ（Ｌｉｇｈｔ　Ｅｍｉｔｔｉｎｇ　Ｄｉｏｄｅ）のそれぞれに流れる電流の制御が可能な表示ユニット、表示ユニットを用いた表示装置、および表示ユニットの表示方法に関する。 The present invention relates to a display unit capable of controlling current flowing in each of LEDs (Light Emitting Diodes) arranged in a matrix on a flat surface, a display device using the display unit, and a display method of the display unit.
　公共施設、競技場及び建物の壁面などに設置され、案内、競技の実況及び広告などを表示する大型映像表示装置は、表示デバイスとしてＬＥＤを使用したものとＬＣＤ（Ｌｉｑｕｉｄ　Ｃｒｙｓｔａｌ　Ｄｉｓｐｌａｙ）を使用したものがある。屋外に設置される大型映像表示装置では、太陽光に照らされた明るい環境下で視認性良く映像を表示するために、高輝度な映像表示が必要であり、これを実現するためにＬＥＤが使用される。 Large-sized image display devices installed on public facilities, stadiums and walls of buildings, etc., for displaying information and information on competitions, events using LEDs as display devices and devices using LCD (Liquid Crystal Display) There is. Large-sized video display devices installed outdoors require high-brightness video display in order to display video with good visibility in bright environments illuminated by sunlight, and LEDs are used to realize this. Be done.
　ＬＥＤタイプの大型映像表示装置は、平面上に多数のＬＥＤを配置することでスクリーンを構成し、各ＬＥＤの輝度を変化させることで映像を表示する。また、赤色、緑色、青色の３色のＬＥＤを使用することで、映像のカラー表示を実現している。 The LED type large image display device forms a screen by arranging a large number of LEDs on a plane, and displays an image by changing the luminance of each LED. In addition, color display of images is realized by using red, green and blue LEDs.
　ＬＥＤの輝度の制御は、ＬＥＤに流れる電流の大きさを変化させることにより実施する。ＬＥＤは、電流値が０のときは消灯状態の黒色であり、流す電流が大きいほど明るく光る。電流制御のために駆動回路が使用される。駆動回路は各ＬＥＤのそれぞれに必要である。電子部品を組み合せて駆動回路を構成することも可能であるが、多数のＬＥＤの電流制御が必要なため、一般的には駆動回路を搭載したＩＣ（Ｉｎｔｅｇｒａｔｅｄ　Ｃｉｒｃｕｉｔ）が使用される。 The control of the brightness of the LED is implemented by changing the magnitude of the current flowing to the LED. When the current value is 0, the LED is black in the light-off state, and the larger the current, the brighter the light. A drive circuit is used for current control. Drive circuits are required for each of the LEDs. Although it is possible to configure the drive circuit by combining electronic components, since current control of a large number of LEDs is required, generally, an IC (Integrated Circuit) mounted with the drive circuit is used.
　屋外に設置される大型映像表示装置は、高所に設置されていたり、近寄りにくい場所に設置されていたりするため、作業員によるメンテナンスが難しい場合も多く、離れた場所からのメンテナンス機能の実現が求められている。 Because large-sized image display devices installed outdoors are installed at high places or places that are difficult to approach, maintenance by workers is often difficult, and maintenance functions can be realized from remote locations. It has been demanded.
　また、大型映像表示装置は、設置場所によっては一日中稼働しており、電源を落としてメンテナンスすることが難しい場合もある。メンテナンスすることが難しい場所では、稼働した状態での異常検知及び自動復旧が求められている。 Further, depending on the installation location, the large image display apparatus is in operation all day, and it may be difficult to turn off the power and maintain it. In places where maintenance is difficult, abnormality detection and automatic recovery in an operating state are required.
　表示ユニットに故障が発生した場合には、故障した表示ユニットを交換する必要があるが、大型映像表示装置の電源を一度落として再投入することで復旧する場合もある。 When a failure occurs in the display unit, it is necessary to replace the failed display unit. However, there is also a case where the power of the large image display apparatus is turned off once and then turned on again.
　電源を一度落とすことで復旧可能な現象の原因としては、ＬＥＤ駆動回路のラッチアップ現象が考えられる。ラッチアップは、半導体素子がオン状態のまま制御不能になり、電流が流れ続けてしまう状態のことであり、ノイズ、静電気等により定格電圧以上の電圧が半導体素子に入力された場合に発生する。ラッチアップ状態から復旧するためには、ラッチアップ状態の半導体素子への電力供給を一旦停止し、再度供給する必要がある。 The cause of the phenomenon that can be recovered by turning off the power once is considered to be the latch-up phenomenon of the LED drive circuit. The latch-up is a state in which the semiconductor element remains uncontrollable with the on state and current continues to flow, and occurs when a voltage higher than the rated voltage is input to the semiconductor element due to noise, static electricity or the like. In order to recover from the latch-up state, the power supply to the semiconductor element in the latch-up state needs to be stopped once and supplied again.
　２４時間稼働していない大型映像表示装置であれば、装置の電源を落として、再度起動したときに復旧する。しかし、２４時間稼働している大型映像装置では、装置の電源を落とすのはユーザーにデメリットとなるため好ましくない。そのため、ラッチアップ等により表示異常が発生した場合には、大型映像表示装置の表示を継続したままで、表示異常が発生した表示ユニットのみ電源を一時的に落とし再投入するのが良い。 If it is a large image display device that has not been in operation for 24 hours, the power of the device is turned off and restored when it is restarted. However, in the case of a large video apparatus operating for 24 hours, it is not preferable to turn off the power of the apparatus since it is a disadvantage for the user. Therefore, when a display abnormality occurs due to latch-up or the like, it is preferable to temporarily turn off the power of the display unit in which the display abnormality has occurred and turn it on again while continuing the display of the large image display device.
　先行技術として、表示パネルを駆動する駆動回路に異常が発生した場合は、当該駆動回路に対する電力供給を遮断する技術が示されている。（特許文献１） As a prior art, when abnormality generate | occur | produces in the drive circuit which drives a display panel, the technique which interrupts | blocks the electric power supply with respect to the said drive circuit is shown. (Patent Document 1)
　また、大型表示盤に表示する映像データから算出した輝度算出値と、測定した輝度値とを比較して発光デバイスの故障状態を判定する技術が示されている。（特許文献２） In addition, there is disclosed a technique for determining a failure state of a light emitting device by comparing a luminance calculation value calculated from video data to be displayed on a large display panel with the measured luminance value. (Patent Document 2)
特開平１１－３０５７２１号公報JP-A-11-305721 特開２０１１－２０９６３７号公報JP, 2011-209637, A
　特許文献１に記載の駆動装置では、駆動回路に異常が発生した場合に、当該駆動回路に対する電力供給を、遮断部（ヒューズ）を用いて遮断しているため、駆動回路に電力供給を再開して復旧させることができない。 In the drive device described in Patent Document 1, when an abnormality occurs in the drive circuit, the power supply to the drive circuit is cut off using a cutoff unit (fuse), so that the power supply to the drive circuit is resumed. Can not be recovered.
　特許文献２に記載の画像表示装置の制御方法では、全ての発光デバイスの輝度を測定し、映像データから算出した輝度算出値と測定輝度値を比較することにより異常を検知するため、輝度を測定するための輝度測定装置が必要となる。 In the control method of the image display device described in Patent Document 2, the luminance is measured because the abnormality is detected by measuring the luminance of all the light emitting devices and comparing the luminance calculation value calculated from the video data with the measured luminance value. Needs a luminance measuring device to
　本発明に係る表示ユニットは、映像データを受信する映像受信手段と、前記映像データに基づく映像を発光によって表示する、平面上にマトリクス状に配置された複数の発光素子からなる発光素子部と、前記映像データに基づき、前記各発光素子の輝度を制御するための輝度制御信号を生成する表示制御手段と、前記輝度制御信号に基づき、前記各発光素子を駆動する駆動手段と、前記映像データの黒画像判定を行う黒画像判定手段と、電源から前記発光素子部へと流れる電流の電流値Ｉの検出を行う電流検出手段と、前記黒画像判定手段によって前記映像データが黒画像と判定された場合に、前記電流検出手段によって検出される、前記黒画像表示の期間に流れる電流の電流値ＩＢに基づき、前記発光素子部の表示異常を検出する表示異常検出手段と、前記表示異常検出手段が表示異常を検出しなかった場合は、前記駆動手段への電力供給を継続し、表示異常を検出した場合は、前記駆動手段への電力供給を一定時間停止した後に再開する電源制御手段と、を備える。 A display unit according to the present invention comprises: an image receiving means for receiving image data; and a light emitting element portion comprising a plurality of light emitting elements arranged in a matrix on a plane for displaying an image based on the image data by light emission; A display control means for generating a luminance control signal for controlling the luminance of each of the light emitting elements based on the video data; a driving means for driving each of the light emitting elements based on the luminance control signal; The image data is determined to be a black image by the black image determination means for performing the black image determination, the current detection means for detecting the current value I of the current flowing from the power source to the light emitting element portion, In the case where the display abnormality is detected, the display abnormality of the light emitting element portion is detected based on the current value I B of the current flowing during the black image display period, which is detected by the current detection means. When the detection means and the display abnormality detection means do not detect display abnormality, the power supply to the drive means is continued, and when the display abnormality is detected, the power supply to the drive means is stopped for a certain period of time And power supply control means to resume operation.
　本発明に係る表示装置は、表示ユニットをマトリクス状に複数個配置した表示パネルと、前記各表示ユニットへ電力を供給するための電源ユニットと、前記電源ユニットから前記各表示ユニットへの電力供給を制御する表示ユニット制御手段と、を備える。 A display device according to the present invention includes a display panel in which a plurality of display units are arranged in a matrix, a power supply unit for supplying power to the display units, and power supply from the power supply unit to the display units. And display unit control means for controlling.
　本発明に係る表示方法は、映像データを受信するステップと、前記映像データに基づき、発光素子部の平面上にマトリクス状に配置された複数の発光素子に対して、前記各発光素子の輝度を制御するための輝度制御信号を生成するステップと、前記輝度制御信号に基づき、駆動手段によって前記各発光素子を駆動するステップと、前記発光素子部へと流れる電流値を検出するステップと、前記映像データの黒画像判定を行うステップと、前記映像データが黒画像と判定された場合に前記発光素子部へと流れる電流の電流値ＩＢと異常判定閾値電流ＩＴＨ１とを比較するステップと、前記電流値ＩＢが前記異常判定閾値電流ＩＴＨ１以上の場合に、電源制御手段による駆動手段への電力供給を一定時間停止するステップと、前記一定時間の経過後に、前記電源制御手段による前記駆動手段への電力供給を再開するステップと、を備える。 The display method according to the present invention comprises the steps of receiving video data, and based on the video data, with respect to a plurality of light emitting elements arranged in a matrix on the plane of the light emitting element unit, Generating a luminance control signal for controlling; driving each of the light emitting elements by a driving unit based on the luminance control signal; detecting a current value flowing to the light emitting element portion; and performing a black image determining data, the steps of the image data is compared with the abnormality determination threshold current I TH1 current value I B of the current flowing to the light emitting element section when it is determined that the black image, the If the current value I B above the abnormality judgment threshold current I TH1, a step of a predetermined time stopping the power supply to the drive means by the power control means, after the predetermined time Resuming the supply of power to the drive means by the power control means after a failure.
　本発明に係る表示ユニットによれば、表示異常検出部により表示異常を検出することが可能であり、さらに表示異常を検出した場合に、電源制御回路により駆動回路への電力供給を制御して表示異常からの復旧を図ることが可能となる。 According to the display unit according to the present invention, the display abnormality detection unit can detect the display abnormality, and when the display abnormality is detected, the power control circuit controls the power supply to the drive circuit to display It is possible to recover from an abnormality.
　本発明に係る表示装置によれば、表示ユニットに表示異常が発生した場合、表示異常が発生している表示ユニットのみの電源を停止し再投入するため、多数の表示ユニットから構成される表示装置の全体の電源を停止する必要がなく、表示異常が発生していない表示ユニットは表示動作を継続することができる。 According to the display device according to the present invention, when display abnormality occurs in the display unit, the power supply of only the display unit in which the display abnormality occurs is stopped and turned on again. It is not necessary to shut down the power supply of the whole, and the display unit in which the display abnormality has not occurred can continue the display operation.
　本発明に係る表示方法によれば、表示異常検出部により表示異常を検出することが可能であり、さらに表示異常を検出した場合に、電源制御回路により駆動回路への電力供給を制御して表示異常からの復旧を図ることが可能となる。 According to the display method according to the present invention, the display abnormality detection unit can detect the display abnormality, and when the display abnormality is detected, the power supply control circuit controls the power supply to the drive circuit to display It is possible to recover from an abnormality.
本発明の実施の形態１に係る表示ユニットの構成を示すブロック図である。It is a block diagram which shows the structure of the display unit which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る表示ユニットにおけるＬＥＤの構成を示すブロック図である。It is a block diagram which shows the structure of LED in the display unit which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る表示ユニットの外観を示す図である。It is a figure which shows the external appearance of the display unit which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る表示ユニットにおける変調方式の１種であるＰＷＭの説明図である。It is explanatory drawing of PWM which is 1 type of the modulation system in the display unit which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る表示ユニットにおける電流検出部の構成を示すブロック図である。It is a block diagram which shows the structure of the electric current detection part in the display unit which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る表示ユニットにおける電流検出部の処理を説明する図である。It is a figure explaining the process of the electric current detection part in the display unit which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る表示ユニットにおける電流検出によるＬＥＤの異常検出の説明の図である。It is a figure of description of abnormality detection of LED by electric current detection in the display unit which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る表示ユニットにおける表示異常検出部の構成を示すブロック図である。It is a block diagram which shows the structure of the display abnormality detection part in the display unit which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る表示ユニットにおける表示異常検出時の駆動回路への電力供給ＯＦＦ制御のタイミング図である。FIG. 6 is a timing diagram of power supply OFF control to the drive circuit at the time of display abnormality detection in the display unit according to Embodiment 1 of the present invention. 本発明の実施の形態１に係る表示ユニットにおける表示異常検出の制御フロー図である。FIG. 5 is a control flow diagram of display abnormality detection in the display unit according to Embodiment 1 of the present invention. 本発明の実施の形態１に係る表示装置の構成を示すブロック図である。FIG. 1 is a block diagram showing a configuration of a display device according to Embodiment 1 of the present invention. 本発明の実施の形態２に係る表示ユニットの構成を示すブロック図である。It is a block diagram which shows the structure of the display unit which concerns on Embodiment 2 of this invention. 本発明の実施の形態２に係る表示ユニットにおける電流検出部の構成を示すブロック図である。It is a block diagram which shows the structure of the electric current detection part in the display unit which concerns on Embodiment 2 of this invention. 本発明の実施の形態２に係る表示ユニットにおける電流検出部の平均化処理を説明する図である。It is a figure explaining the equalization process of the electric current detection part in the display unit which concerns on Embodiment 2 of this invention. 本発明の実施の形態２に係る表示ユニットにおける駆動回路でのノイズ的な電流変動を示す図である。It is a figure which shows noise-like current fluctuation in the drive circuit in the display unit concerning Embodiment 2 of this invention. 本発明の実施の形態３に係る表示ユニットの構成を示すブロック図である。It is a block diagram which shows the structure of the display unit which concerns on Embodiment 3 of this invention. 本発明の実施の形態４に係る表示ユニットの構成を示すブロック図である。It is a block diagram which shows the structure of the display unit which concerns on Embodiment 4 of this invention. 本発明の実施の形態５に係る表示装置の構成を示すブロック図である。It is a block diagram which shows the structure of the display apparatus based on Embodiment 5 of this invention.
実施の形態１．
　図１は、実施の形態１に係る表示ユニット１００の構成を概略的に示すブロック構成図である。表示ユニット１００は、例えば、公共施設、競技場及び建物の壁面などに、各種案内、競技の実況中継映像及び広告映像などの映像を表示する装置であり、映像を表示するスクリーンを構成する基本単位となるユニットである。表示ユニット１００は、平面上に２０００個程度のＬＥＤを配置したユニットであり、さらに多数の表示ユニット１００を２次元のマトリクス状に敷き詰めることで、１つのスクリーンを構成している。表示ユニット１００は、映像データに応じて、表示ユニット１００上の各ＬＥＤの輝度を制御することで映像を表示する。 Embodiment 1
FIG. 1 is a block diagram schematically showing a configuration of a display unit 100 according to the first embodiment. The display unit 100 is a device for displaying an image such as various information, live broadcast images of competitions and advertisement images on, for example, public facilities, stadiums, and wall surfaces of buildings, and is a basic unit constituting a screen for displaying the images. Is a unit that The display unit 100 is a unit in which about 2000 LEDs are arranged on a plane, and a large number of display units 100 are arranged in a two-dimensional matrix to form one screen. The display unit 100 displays an image by controlling the luminance of each LED on the display unit 100 according to the image data.
　図１に示すように、表示ユニット１００は、映像受信回路１０１と、表示制御回路１０２と、駆動回路１０３と、平面上にマトリクス状に配置された複数のＬＥＤ１１４（発光素子）で構成された発光素子部１０４と、電流検出部１０５と、黒画像判定回路１０６と、表示異常検出部１０７と、電源制御回路１０８とを備える。 As shown in FIG. 1, the display unit 100 is a light emission composed of a video reception circuit 101, a display control circuit 102, a drive circuit 103, and a plurality of LEDs 114 (light emitting elements) arranged in a matrix on a plane. An element unit 104, a current detection unit 105, a black image determination circuit 106, a display abnormality detection unit 107, and a power control circuit 108 are provided.
　映像受信回路１０１は、表示ユニット１００によって表示する映像データを外部から受信し、映像データを表示制御回路１０２と、黒画像判定回路１０６へ出力する。 The video reception circuit 101 externally receives video data to be displayed by the display unit 100, and outputs the video data to the display control circuit 102 and the black image determination circuit 106.
　表示制御回路１０２は、映像受信回路１０１が出力した映像データに基づき、発光素子部１０４を構成する各ＬＥＤ１１４の輝度を個別に制御するための輝度制御信号を生成して、表示制御を行う。 The display control circuit 102 performs display control by generating a brightness control signal for individually controlling the brightness of each of the LEDs 114 that constitute the light emitting element unit 104 based on the video data output from the video receiving circuit 101.
　駆動回路１０３は、表示制御回路１０２によって生成された輝度制御信号に基づき、発光素子部１０４を構成する各ＬＥＤ１１４を駆動させる。 The drive circuit 103 drives each of the LEDs 114 that constitute the light emitting element unit 104 based on the luminance control signal generated by the display control circuit 102.
　ＬＥＤ１１４は、映像データに基づく映像を発光することで表示する。 The LED 114 displays an image based on the image data by emitting light.
　図２は、上述のＬＥＤ１１４の構成を示す図である。図２は、１つのＬＥＤ１１４に３つのＬＥＤ発光源１１４ａ，１１４ｂ，１１４ｃを含んでいる構成を示している。１つのＬＥＤ１１４に含まれるＬＥＤ発光源１１４ａ，１１４ｂ，１１４ｃは、ＬＥＤ発光源１１４ａが赤色を発光、ＬＥＤ発光源１１４ｂが緑色を発光、ＬＥＤ発光源１１４ｃが青色をそれぞれ発光する。３つのＬＥＤ発光源１１４ａ，１１４ｂ，１１４ｃそれぞれの輝度を変えることによって、様々な色を発色し、カラー映像を表示することが可能となる。なお、図２では、３つのＬＥＤ発光源１１４ａ，１１４ｂ，１１４ｃを含むＬＥＤ１１４を複数配置する構成を示したが、ＬＥＤ１１４が含むＬＥＤ発光源の数は３つに限るものではない。また、表示ユニット１００に３色が発光可能なＬＥＤ１１４の代わりとして、赤色，緑色，青色にそれぞれ個別に発光するＬＥＤを平面上にマトリクス状に配置してもよい。 FIG. 2 is a diagram showing the configuration of the LED 114 described above. FIG. 2 shows a configuration in which one LED 114 includes three LED light sources 114a, 114b and 114c. The LED light source 114a emits red light, the LED light source 114b emits green light, and the LED light source 114c emits blue light. By changing the luminance of each of the three LED light sources 114a, 114b, 114c, it is possible to develop various colors and display a color image. Although FIG. 2 shows a configuration in which a plurality of LEDs 114 including three LED light sources 114a, 114b and 114c are arranged, the number of LED light sources included in LED 114 is not limited to three. Further, instead of the LEDs 114 capable of emitting three colors in the display unit 100, LEDs emitting light of red, green and blue individually may be arranged in a matrix on a plane.
　図３は、実施の形態１に係る表示ユニット１００の外観を示す図である。表示ユニット１００は、映像を表示するためのＬＥＤ１１４を、平面上にマトリクス状に配置している。例えば、ＬＥＤ１１４は、表示ユニット１００上の水平方向に３０個、垂直方向に２０個配置される。 FIG. 3 is a view showing the appearance of the display unit 100 according to the first embodiment. In the display unit 100, LEDs 114 for displaying an image are arranged in a matrix on a plane. For example, 30 LEDs are arranged in the horizontal direction on the display unit 100, and 20 LEDs are arranged in the vertical direction.
　電流検出部１０５は、各ＬＥＤ１１４へ供給される電力の電流検出を行う。 The current detection unit 105 detects the current of the power supplied to each LED 114.
　黒画像判定回路１０６は、映像受信回路１０１が出力した映像データが黒画像であるか否かを判定する。 The black image determination circuit 106 determines whether the video data output from the video reception circuit 101 is a black image.
　表示異常検出部１０７は、黒画像判定回路１０６によって映像データが黒画像と判定された場合の、電流検出部１０５によって検出された電流値に基づき、映像の表示異常を検出する。 The display abnormality detection unit 107 detects an image display abnormality based on the current value detected by the current detection unit 105 when the black image determination circuit 106 determines that the video data is a black image.
　電源制御回路１０８は、表示異常検出部１０７による表示異常の検出に応じて、駆動回路１０３への電力供給を行う。 The power supply control circuit 108 supplies power to the drive circuit 103 in accordance with the detection of display abnormality by the display abnormality detection unit 107.
　以下、表示ユニット１００の詳細な動作について説明する。 Hereinafter, the detailed operation of the display unit 100 will be described.
　映像受信回路１０１は、表示ユニット１００において表示する映像データを端子１１２から受信し、表示制御回路１０２へと出力する。表示ユニット１００に例えば横３０個、縦２０個のＬＥＤ１１４が配置されている場合、この６００個のＬＥＤ１１４に表示する映像データを受信する。各ＬＥＤ１１４にＬＥＤ発光源が３つ含まれている場合、１８００個分のＬＥＤ発光源に表示する映像データを受信する。この場合、映像データには、１８００個分のＬＥＤ発光源を発光する際のそれぞれの輝度の情報が含まれている。映像データは、例えば、ＣＭＯＳ（Ｃｏｍｐｌｅｍｅｎｔａｒｙ　Ｍｅｔａｌ　Ｏｘｉｄｅ　Ｓｅｍｉｃｏｎｄｕｃｔｏｒ）またはＬＶＤＳ（Ｌｏｗ　Ｖｏｌｔａｇｅ　Ｄｉｆｆｅｒｅｎｔｉａｌ　Ｓｉｇｎａｌｉｎｇ）の電気信号として送られてきたものを受信し、ＣＭＯＳの電気信号として出力する。以下、制御対象をＬＥＤ１１４単位として説明するが、ここでＬＥＤ１１４の制御とは、ＬＥＤ１１４を構成するＬＥＤ発光源を個々に制御することを意味する。 The video reception circuit 101 receives video data to be displayed on the display unit 100 from the terminal 112, and outputs the video data to the display control circuit 102. When, for example, 30 LEDs horizontally and 20 vertically are arranged in the display unit 100, the image data displayed on the 600 LEDs 114 is received. When each of the LEDs 114 includes three LED light sources, image data to be displayed on the 1800 LED light sources is received. In this case, the video data includes information on the respective luminance when emitting light of 1800 LED light sources. The video data receives, for example, a signal sent as a complementary metal oxide semiconductor (CMOS) or low voltage differential signaling (LVDS) electrical signal, and outputs the signal as a CMOS electrical signal. Hereinafter, although a control object is demonstrated as LED114 unit, control of LED114 means controlling the LED light source which comprises LED114 separately here.
　表示制御回路１０２は、映像受信回路１０１から出力された映像データに応じて、表示制御を行う。表示制御回路１０２は、映像データに含まれる発光に関する情報にしたがって、各ＬＥＤ１１４の輝度を制御することで、映像表示を行う。表示制御回路１０２は、各ＬＥＤ１１４の輝度を制御するために、各ＬＥＤ１１４に対応した輝度制御信号を生成する。輝度の制御は、例えば、ＰＷＭ（Ｐｕｌｓｅ　Ｗｉｄｔｈ　Ｍｏｄｕｌａｔｉｏｎ）により行う。図４は、実施の形態１に係る表示ユニット１００における変調方式の１種であるＰＷＭの説明図である。ＰＷＭは、図４に示すように信号のＯＮ、ＯＦＦの幅により出力を制御する方式であり、一番明るく発光する際には常時ＯＮ、発光しないときには常時ＯＦＦとする。常時ＯＦＦの状態から、ＯＮの期間を増やすにつれて、より明るく発光されるようになる。 The display control circuit 102 performs display control in accordance with the video data output from the video receiving circuit 101. The display control circuit 102 performs video display by controlling the luminance of each LED 114 in accordance with the information on light emission included in the video data. The display control circuit 102 generates a brightness control signal corresponding to each LED 114 in order to control the brightness of each LED 114. The control of the luminance is performed, for example, by PWM (Pulse Width Modulation). FIG. 4 is an explanatory diagram of PWM, which is one of modulation methods in the display unit 100 according to the first embodiment. PWM is a method of controlling the output by the width of ON and OFF of the signal as shown in FIG. 4, and is always ON when emitting the brightest light and always OFF when not emitting the light. From the always OFF state, as the ON period is increased, the light is emitted more brightly.
　駆動回路１０３は、表示制御回路１０２によって生成された輝度制御信号に基づき各ＬＥＤ１１４を駆動させる。駆動回路１０３は、表示制御回路１０２が出力した輝度制御信号を受信し、輝度制御信号に基づき電流をＬＥＤ１１４に流すことで発光制御を行う。 The drive circuit 103 drives each of the LEDs 114 based on the luminance control signal generated by the display control circuit 102. The drive circuit 103 receives the luminance control signal output from the display control circuit 102, and controls the light emission by causing a current to flow to the LED 114 based on the luminance control signal.
　表示制御回路１０２がＰＷＭによって輝度を制御する場合、駆動回路１０３は、例えば、固定電流値のＯＮ、ＯＦＦが可能な電流駆動回路とする。輝度制御信号がＯＮ状態を示しているとき、駆動回路１０３はＬＥＤ１１４に対して予め決められた電流値の大きさの電流を流して、輝度制御信号がＯＦＦ状態を示しているとき、駆動回路１０３はＬＥＤ１１４に対して流す電流の大きさを０とすることによって、駆動回路１０３はＬＥＤ１１４を発光制御する。輝度制御信号がＯＮ状態を示しているときに流す電流の電流値は、ＬＥＤ１１４を最も明るく発光させるときの電流値とする。 When the display control circuit 102 controls the luminance by PWM, the drive circuit 103 is, for example, a current drive circuit capable of turning on and off a fixed current value. When the brightness control signal indicates the ON state, the drive circuit 103 supplies a current having a predetermined current value to the LED 114, and when the brightness control signal indicates the OFF state, the drive circuit 103. The drive circuit 103 controls the light emission of the LED 114 by setting the magnitude of the current supplied to the LED 114 to zero. The current value of the current flowed when the luminance control signal indicates the ON state is the current value at which the LED 114 emits the brightest light.
　発光素子部１０４は、駆動回路１０３による発光制御に応じて、発光し映像を表示する。発光素子部１０４は、平面上にマトリクス状に配置された複数のＬＥＤ１１４で構成されている。表示制御回路１０２がＰＷＭにより輝度を制御する場合、発光素子部１０４は、駆動回路１０３が発光素子部１０４に対して予め決められた電流値の大きさの電流を流している場合に点灯している状態となる。また、発光素子部１０４は、駆動回路１０３が発光素子部１０４に対して流す電流の大きさが０の場合に消灯状態となる。発光素子部１０４は、点灯状態と消灯状態の時間的な割合により輝度が決まる。 The light emitting element unit 104 emits light and displays an image according to light emission control by the drive circuit 103. The light emitting element portion 104 is composed of a plurality of LEDs 114 arranged in a matrix on a plane. When the display control circuit 102 controls the luminance by PWM, the light emitting element unit 104 lights up when the driving circuit 103 supplies a current having a predetermined current value to the light emitting element unit 104. It will be in the In addition, the light emitting element portion 104 is turned off when the magnitude of the current supplied from the driving circuit 103 to the light emitting element portion 104 is zero. The luminance of the light emitting element portion 104 is determined by the temporal ratio of the lighting state and the lighting off state.
　電流検出部１０５は、各ＬＥＤ１１４へ供給される電力の電流検出を行う。図５は、表示ユニット１００における電流検出部１０５の構成の一例を示したブロック図である。図５に示すように、電流検出部１０５は、電流電圧変換部５０１と、第１の増幅部５０２と、電圧制限部５０３と、第２の増幅部５０４と、アナログデジタル変換部５０５とを備える。 The current detection unit 105 detects the current of the power supplied to each LED 114. FIG. 5 is a block diagram showing an example of the configuration of current detection unit 105 in display unit 100. Referring to FIG. As shown in FIG. 5, the current detection unit 105 includes a current-voltage conversion unit 501, a first amplification unit 502, a voltage limiting unit 503, a second amplification unit 504, and an analog-digital conversion unit 505. .
　電流電圧変換部５０１は、電源から流れる電流の電流値を電圧値に変換する。電流電圧変換部５０１は、１０ミリオーム程度の値の小さい抵抗器により実現される。なお、電流の大きさを検出するための抵抗は、シャント抵抗器と呼ばれる。図５において、端子５０６から供給された電力は、電流電圧変換部５０１を通り、端子５０７から出力されて、表示ユニット１００の各部へ供給される。また、電流電圧変換部５０１から、得られた電圧値が第１の増幅部５０２へと出力される。シャント抵抗器の抵抗値をＲ、電流の大きさをＩとすると、電流電圧変換部５０１からは、電圧値（Ｉ×Ｒ）が出力される。 The current-voltage conversion unit 501 converts the current value of the current flowing from the power supply into a voltage value. The current-voltage converter 501 is realized by a small resistor of about 10 milliohms. The resistor for detecting the magnitude of the current is called a shunt resistor. In FIG. 5, the power supplied from the terminal 506 passes through the current-voltage converter 501, is output from the terminal 507, and is supplied to each part of the display unit 100. Further, the obtained voltage value is output from the current-voltage conversion unit 501 to the first amplification unit 502. Assuming that the resistance value of the shunt resistor is R and the magnitude of the current is I, the current-voltage conversion unit 501 outputs a voltage value (I × R).
　第１の増幅部５０２は、電流電圧変換部５０１が出力した電圧を増幅して増幅電圧値ＶＡを算出して、電圧制限部５０３へと出力する。第１の増幅部５０２は、例えばオペアンプにより実現する。 The first amplification unit 502 amplifies the voltage output from the current-voltage conversion unit 501 to calculate an amplification voltage value VA , and outputs the amplification voltage value VA to the voltage restriction unit 503. The first amplification unit 502 is realized by an operational amplifier, for example.
　電圧制限部５０３は、第１の増幅部５０２が出力した増幅電圧値ＶＡに対し、予め決められた閾値電圧ＶＴＨ以上の電圧をカットして制限電圧ＶＲを算出して、第２の増幅部５０４へと出力する。閾値電圧ＶＴＨ以上の電圧をカットして制限電圧ＶＲを算出する理由は、黒画像時の表示異常の判定に不要な範囲の電圧をカットし、表示異常の判定の精度を向上させるためである。電圧制限部５０３は、例えば、ダイオードとオペアンプにより実現する。予め決められた閾値電圧ＶＴＨは、例えば１つのＬＥＤ１１４が最も明るく発光したときに流れる電流値である２０（ｍＡ）に対応する電圧値とする。 Voltage limiting section 503 to amplified voltage value V A of the first amplifying unit 502 is output, calculates the limit voltage V R by cutting a predetermined threshold voltage V TH over voltage, the second The signal is output to the amplification unit 504. The reason for calculating the threshold voltage V TH or more cuts to limit voltage V R the voltage is because the cut voltage of the unnecessary range in the display abnormality determination of the black image, to improve the accuracy of determination of the abnormal display is there. The voltage limiting unit 503 is realized by, for example, a diode and an operational amplifier. The predetermined threshold voltage V TH is, for example, a voltage value corresponding to 20 (mA) which is a current value flowing when one LED 114 emits the brightest light.
　第２の増幅部５０４は、電圧制限部５０３が算出した制限電圧ＶＲを増幅して増幅制限電圧値ＶＲＡを算出して、アナログデジタル変換部５０５へと出力する。第２の増幅部５０４は、例えばオペアンプにより実現する。 The second amplifying unit 504, calculates the amplification limit voltage value V RA amplifies the limit voltage V R the voltage limiting section 503 is calculated, and output to an analog-digital converter 505. The second amplification unit 504 is realized by, for example, an operational amplifier.
　アナログデジタル変換部５０５は、第２の増幅部５０４が出力した増幅制限電圧値ＶＲＡをアナログ値からデジタル値に変換するとともに、電圧値を電流値へと変換して、電流値Ｉを算出して、端子５０８へと出力する。アナログデジタル変換部５０５は、例えば、Ａ／Ｄコンバータ（Ａｎａｌｏｇ－ｔｏ－Ｄｉｇｉｔａｌコンバータ）により実現する。 The analog-to-digital converter 505 converts the amplification limited voltage value VRA output from the second amplification unit 504 from an analog value to a digital value, and converts the voltage value to a current value to calculate the current value I. Output to the terminal 508. The analog-to-digital converter 505 is realized by, for example, an A / D converter (Analog-to-Digital converter).
　電流検出部１０５は、アナログデジタル変換部５０５から出力された電流値Ｉを電流検出結果として端子５０８から出力する。 The current detection unit 105 outputs the current value I output from the analog-to-digital converter 505 from the terminal 508 as a current detection result.
　電流検出部１０５における電圧値をＰ１、増幅電圧値ＶＡをＰ２、制限電圧ＶＲをＰ３、増幅制限電圧値ＶＲＡをＰ４として、それぞれの電圧値の関係を図６に示す。丸で示された電圧値の関係は、第１の増幅部５０２から出力された電圧Ｐ２が閾値電圧ＶＴＨを越えている場合であり、三角で示された電圧値の関係は、第１の増幅部５０２から出力された電圧Ｐ２が閾値電圧ＶＴＨを越えていない場合である。例えば、閾値電圧ＶＴＨを２０（ｍＡ）×抵抗値Ｒとすると、丸及び三角で示された電圧値の関係のどちらの場合においても、第４の電圧値を得ることで、０～２０（ｍＡ）程度の範囲の電流の大きさを検知することが可能となる。なお、電流検出部１０５において、アナログデジタル変換部５０５の精度が高い場合には、電圧制限部５０３及び第２の増幅部５０４を備えない構成とすることも可能である。この場合、部品点数の削減できるため、より低コスト化を図ることが可能である。 The voltage value at the current detecting section 105 P1, the amplified voltage value V A P2, the limit voltage V R P3, the amplification limit voltage value V RA as P4, showing the relationship of each voltage value in FIG. The relationship between the voltage values shown by circles is when the voltage P2 output from the first amplification unit 502 exceeds the threshold voltage V TH , and the relationship between the voltage values shown by triangles is the first. This is the case where the voltage P2 output from the amplification unit 502 does not exceed the threshold voltage V TH . For example, assuming that the threshold voltage V TH is 20 (mA) × (resistance value R), a fourth voltage value can be obtained in any case of the voltage values shown by circles and triangles. It becomes possible to detect the magnitude of current in the range of about mA). In the current detection unit 105, when the accuracy of the analog-to-digital converter 505 is high, the voltage limiting unit 503 and the second amplification unit 504 may not be provided. In this case, since the number of parts can be reduced, the cost can be further reduced.
　表示ユニット１００に１８００個のＬＥＤ発光源が配置されている場合において、１つのＬＥＤ発光源が最も明るく発光したときに流れる電流値を２０（ｍＡ）とすると、表示ユニット１００の全てのＬＥＤ発光源が点灯した場合は、電源から２０（ｍＡ）×１８００＝３６０００（ｍＡ）＝３６（Ａ）程度の電流が流れる。これに対し、ＬＥＤ発光源が１個のみ点灯するときの電流は２０（ｍＡ）となる。 In the case where 1800 LED light sources are arranged in the display unit 100, assuming that the current value which flows when one LED light source emits the brightest light is 20 (mA), all the LED light sources of the display unit 100 When is lit, a current of about 20 (mA) × 1800 = 36000 (mA) = 36 (A) flows from the power supply. On the other hand, the current when only one LED light source is lit is 20 (mA).
　図７は、実施の形態１の表示ユニット１００におけるＬＥＤ１１４の表示異常検出の説明図である。図７（ａ）に示すように、全てのＬＥＤ１１４が点灯して最大３６Ａ程度の電流が流れている場合に、時間ｔで１個のＬＥＤ１１４の中の１つのＬＥＤ発光源に異常が発生して１個のみ常時消灯となる場合は、３６Ａ程度の電流値に対し２０（ｍＡ）の変動を検出する必要があり、表示異常検出は難しい。
　一方、表示ユニット１００の全てのＬＥＤ１１４が消灯してほぼ電流が流れていない場合に、時間ｔで１個のＬＥＤ１１４の中の１つのＬＥＤ発光源に異常が発生して１つのＬＥＤ発光源のみ常時点灯となる場合は、図７（ｂ）に示すように０～２０（ｍＡ）程度の範囲の電流を測定できれば良いため、表示異常検出が容易となる。
　本発明では、表示ユニット１００の全てのＬＥＤ１１４が消灯してほぼ電流が流れていない場合に、時間ｔで１個のＬＥＤ１１４の中の１つのＬＥＤ発光源に異常が発生して１つのＬＥＤ発光源のみ常時点灯をしている場合の表示異常の検出を可能とする。以下に表示異常検出方法の詳細を示す。 FIG. 7 is an explanatory diagram of display abnormality detection of the LED 114 in the display unit 100 according to the first embodiment. As shown in FIG. 7A, when all the LEDs 114 are turned on and a current of about 36 A at maximum flows, an abnormality occurs in one of the LED light sources in one LED 114 at time t. In the case where only one is turned off constantly, it is necessary to detect a fluctuation of 20 (mA) with respect to a current value of about 36 A, and display abnormality detection is difficult.
On the other hand, when all the LEDs 114 of the display unit 100 are turned off and almost no current flows, an abnormality occurs in one of the LED light sources in one LED 114 at time t and only one LED light source is always on In the case of lighting, as shown in FIG. 7B, it is sufficient to measure the current in the range of about 0 to 20 (mA), so that display abnormality detection becomes easy.
In the present invention, when all the LEDs 114 of the display unit 100 are turned off and substantially no current flows, an abnormality occurs in one of the LED light sources in one LED 114 at time t, and one LED light source is generated. Enables detection of display abnormalities when the display is always on. The details of the display abnormality detection method are shown below.
　黒画像判定回路１０６は、映像受信回路１０１において受信され出力された映像データが、黒画像であるかどうかを判定し、黒画像判定結果を出力する。ここで黒画像とは、表示ユニット１００の全てのＬＥＤ１１４が消灯しているか、または、それに近い状態のことである。黒画像判定回路１０６は、受信された映像データにおいて、全てのＬＥＤ１１４に対する輝度制御信号の値が予め決められた閾値以下になっている場合に黒画像と判定する。黒画像判定回路１０６は、例えば、受信された映像データにおいて、全てのＬＥＤ１１４に対する輝度制御信号の値が全てＯＦＦ状態の場合に黒画像と判定する。 The black image determination circuit 106 determines whether the video data received and output by the video reception circuit 101 is a black image, and outputs a black image determination result. Here, the black image is a state in which all the LEDs 114 of the display unit 100 are off or close thereto. The black image determination circuit 106 determines that the received image data is a black image when the values of the brightness control signals for all the LEDs 114 are less than or equal to a predetermined threshold value. The black image determination circuit 106 determines that the image is a black image, for example, when all the values of the brightness control signals for all the LEDs 114 in the received video data are in the OFF state.
　映像データが黒画像判定回路１０６によって黒画像と判定された際に、電源から各ＬＥＤ１１４へと流れる電流値をＩＢとする場合、表示異常検出部１０７は、電流値ＩＢにより映像の表示異常検出を行う。表示異常検出部１０７の構成の一例を図８に示す。図８の構成において、表示異常検出部１０７は、平均値算出部８０１と、標準偏差算出部８０２と、閾値電流算出部８０３と、閾値電流記憶部８０４と、表示異常判定部８０５とを備える。表示異常検出部１０７は、例えば、ＣＰＵ、マイコン等を使用して実現することが可能である。 When the video data is determined as the black image by a black image determining circuit 106, when the value of the current flowing from the power source to each LED114 and I B, the display abnormality detector 107, the display abnormality in the signal using the current value I B Perform detection. An example of the configuration of the display abnormality detection unit 107 is shown in FIG. In the configuration of FIG. 8, the display abnormality detection unit 107 includes an average value calculation unit 801, a standard deviation calculation unit 802, a threshold current calculation unit 803, a threshold current storage unit 804, and a display abnormality determination unit 805. The display abnormality detection unit 107 can be realized using, for example, a CPU, a microcomputer, or the like.
　平均値算出部８０１は、端子８０８から入力される黒画像判定回路１０６の判定が黒画像を示している場合に、端子８０６から入力される黒画像判定回路１０６の判定が黒画像を示している期間に流れる電流である電流値ＩＢの電流平均値を算出し、電流値ＩＢの平均を閾値電流算出部８０３へと出力する。電流値ＩＢの電流平均値をＩＭＮ１とする。 The average value calculation unit 801 indicates that the determination of the black image determination circuit 106 input from the terminal 806 indicates a black image when the determination of the black image determination circuit 106 input from the terminal 808 indicates a black image. A current average value of the current value I B which is a current flowing in a period is calculated, and the average of the current value I B is output to the threshold current calculation unit 803. The current average value of the current value I B is set to I MN1 .
　標準偏差算出部８０２は、端子８０８から入力される黒画像判定回路１０６の判定が黒画像を示している場合に、端子８０６から入力される電流値ＩＢの標準偏差を算出し、電流値ＩＢの標準偏差を閾値電流算出部８０３へと出力する。電流値ＩＢの標準偏差をＩＳＤ１とする。 The standard deviation calculation unit 802 calculates the standard deviation of the current value I B input from the terminal 806 when the determination of the black image determination circuit 106 input from the terminal 808 indicates a black image, and the current value I The standard deviation of B is output to the threshold current calculation unit 803. The standard deviation of the current value I B is I SD1 .
　閾値電流算出部８０３は、平均値算出部８０１が出力する電流平均値ＩＭＮ１と、標準偏差算出部８０２が出力する標準偏差ＩＳＤ１から、異常判定閾値電流を求めて閾値電流記憶部８０４へと出力する。異常判定閾値電流をＩＴＨ１とすると、異常判定閾値電流ＩＴＨ１は、以下の式（１）により求める。
　ＩＴＨ１＝ＩＭＮ１＋（ＩＳＤ１×３）　・・・（１）
　式（１）により、端子８０８から入力される黒画像判定回路１０６の判定が黒画像を示している場合の電流値ＩＢが、黒画像時の正常な電流値の分布の範囲内に入っているかを判定するための閾値電流を得ることが可能となる。 The threshold current calculation unit 803 obtains an abnormality determination threshold current from the current average value I MN1 output from the average value calculation unit 801 and the standard deviation I SD1 output from the standard deviation calculation unit 802, and sends the result to the threshold current storage unit 804. Output. Assuming that the abnormality determination threshold current is I TH1 , the abnormality determination threshold current I TH1 is obtained by the following equation (1).
I TH1 = I MN1 + (I SD1 × 3) (1)
According to the equation (1), the current value I B when the determination of the black image determination circuit 106 input from the terminal 808 indicates a black image falls within the range of the distribution of the normal current value at the time of the black image. It is possible to obtain a threshold current for determining the presence or absence.
　閾値電流記憶部８０４は、閾値電流算出部８０３が出力する異常判定閾値電流ＩＴＨ１を記憶する。なお、異常判定閾値電流ＩＴＨ１の算出は、端子８０７から閾値電流更新指示があったときに実行される。端子８０７からの閾値電流更新指示として、例えば、大型映像表示装置の設置の際に試験用の映像を表示し、試験が終了した段階で１度だけ指示を出すことで、異常が発生していない状態での黒画像表示時の電流値から、異常判定閾値電流ＩＴＨ１を求めて記憶することが可能となる。また、端子８０７からの閾値電流更新指示は、気温の変化等の環境変化に伴い行うことが好ましい。なお、大型映像表示装置の設置前の閾値電流記憶部８０４の初期値は、初期値であることが分かるように、例えば－１（Ａ）としておく。 The threshold current storage unit 804 stores the abnormality determination threshold current I TH1 output from the threshold current calculation unit 803. The calculation of the abnormality determination threshold current I TH1 is performed when there is a threshold current update instruction from the terminal 807. As a threshold current update instruction from the terminal 807, for example, a test image is displayed at the time of installation of a large image display device, and an instruction is issued only once at the end of the test, whereby no abnormality occurs. The abnormality determination threshold current I TH1 can be obtained and stored from the current value at the time of black image display in the state. Moreover, it is preferable to perform the threshold current update instruction from the terminal 807 in accordance with environmental changes such as a change in air temperature. The initial value of the threshold current storage unit 804 before the installation of the large image display apparatus is, for example, −1 (A) so that the initial value can be known.
　表示異常判定部８０５は、端子８０８から入力される黒画像判定回路１０６の判定が黒画像を示している場合に、閾値電流記憶部８０４が記憶している異常判定閾値電流ＩＴＨ１と端子８０６から入力される電流値ＩＢとを比較する。電流値ＩＢが異常判定閾値電流ＩＴＨ１以上の場合は、表示異常が発生したと検出するため、表示異常有りとして端子８０９へと出力する。電流値ＩＢが異常判定閾値電流ＩＴＨ１未満の場合は、表示異常の発生は検出されないため、表示異常無しとして端子８０９へと出力する。ただし、閾値電流記憶部８０４で記憶している異常判定閾値電流ＩＴＨ１が初期値の場合は比較を行わず、表示異常検出結果を表示異常無しとして出力する。閾値電流記憶部８０４が記憶している異常判定閾値電流ＩＴＨ１と、端子８０６から入力される電流値ＩＢとの比較により、表示異常検出部１０７は表示異常を検出することが可能となる。また、単純な比較のみで表示異常を判定するため、容易に実現することが可能である。 When the determination of the black image determination circuit 106 input from the terminal 808 indicates a black image, the display abnormality determination unit 805 displays the abnormality determination threshold current I TH1 stored in the threshold current storage unit 804 and the terminal 806. The input current value I B is compared. If the current value I B is greater than or abnormality judgment threshold current I TH1, for detecting the abnormal display occurs, and outputs it to the terminal 809 as there abnormal display. When the current value I B is less than the abnormality determination threshold current I TH1 , the occurrence of display abnormality is not detected, and therefore, the display abnormality is not generated and is output to the terminal 809. However, when the abnormality determination threshold current I TH1 stored in the threshold current storage unit 804 is an initial value, comparison is not performed, and the display abnormality detection result is output as no display abnormality. By comparing the abnormality determination threshold current I TH1 stored in the threshold current storage unit 804 with the current value I B input from the terminal 806, the display abnormality detection unit 107 can detect a display abnormality. Further, since the display abnormality is determined only by the simple comparison, it can be easily realized.
　電源制御回路１０８は、表示異常検出部１０７による表示異常の検出に応じて、駆動回路１０３への電力供給を行う。表示異常検出部１０７が表示異常を検出しない場合、電源制御回路１０８は表示ユニット１００の駆動回路１０３へ電力の供給を継続する。表示異常検出部１０７が表示異常を検出する場合は、電源制御回路１０８は表示ユニット１００の駆動回路１０３へ電力供給を一定時間停止する。電力供給を停止する時間は、使用する発光素子によって異なるが、例えば１秒程度のオーダーの長さであり、ＬＥＤ１１４への電力供給が完全に停止する長さである。一定時間が経過した後、電源制御回路１０８は、表示ユニット１００の駆動回路１０３への電力供給を再開する。したがって、ラッチアップ現象により表示異常が発生した場合、表示ユニット１００の駆動回路１０３への電力供給を停止して、一定時間が経過した後、表示ユニット１００の駆動回路１０３への電力供給を再開することによって、ラッチアップ現象に起因する表示異常からの復旧を図ることが可能となる。 The power supply control circuit 108 supplies power to the drive circuit 103 in accordance with the detection of display abnormality by the display abnormality detection unit 107. If the display abnormality detection unit 107 does not detect a display abnormality, the power supply control circuit 108 continues the supply of power to the drive circuit 103 of the display unit 100. When the display abnormality detection unit 107 detects a display abnormality, the power supply control circuit 108 stops the power supply to the drive circuit 103 of the display unit 100 for a certain period of time. The time for stopping the power supply varies depending on the light emitting element used, but is, for example, on the order of one second, and the power supply to the LED 114 is completely stopped. After a predetermined time has elapsed, the power control circuit 108 resumes the power supply to the drive circuit 103 of the display unit 100. Therefore, when a display abnormality occurs due to the latch-up phenomenon, the power supply to the drive circuit 103 of the display unit 100 is stopped, and after a predetermined time elapses, the power supply to the drive circuit 103 of the display unit 100 is resumed. Thus, it is possible to recover from the display abnormality caused by the latch-up phenomenon.
　実施の形態１に係る表示ユニット１００における、黒画像表示時の表示異常検出と、表示異常検出時の駆動回路１０３への電源供給を停止する制御のタイミング図を図９に示す。端子８０８から入力される黒画像判定回路１０６の判定が黒画像を示している区間は、Ｂ１～Ｂ２、Ｂ３～Ｂ４であり、異常判定閾値電流がＩＴＨ１である場合、Ｂ１～Ｂ２の区間では電流値が異常判定閾値電流ＩＴＨ１未満であるため、表示異常は検出されない。これに対して、Ｂ３～Ｂ４の区間では電流値が異常判定閾値電流ＩＴＨ１以上であるため、表示異常が検出される。 FIG. 9 is a timing diagram of display abnormality detection at the time of black image display and control of stopping power supply to the drive circuit 103 at the time of display abnormality detection in the display unit 100 according to the first embodiment. A section in which the determination of the black image determination circuit 106 input from the terminal 808 indicates a black image is B1 to B2 and B3 to B4, and when the abnormality determination threshold current is I TH1 , in the section B1 to B2 Since the current value is less than the abnormality determination threshold current I TH1 , no display abnormality is detected. On the other hand, since the current value is equal to or greater than the abnormality determination threshold current I TH1 in the section B3 to B4, display abnormality is detected.
　実施の形態１に係る表示ユニット１００の表示異常検出方法について、図１０に示す制御フロー図を用いて説明する。 A display abnormality detection method of display unit 100 according to the first embodiment will be described using a control flow diagram shown in FIG.
　表示装置１の電源がＯＮとなると、ステップＳ１では、電流検出部１０５によって、発光素子部１０４に流れる電流の電流値が検出される。 When the power supply of the display device 1 is turned on, the current detection unit 105 detects the current value of the current flowing through the light emitting element unit 104 in step S1.
　ステップＳ２では、黒画像判定回路１０６によって、ステップＳ１において電流を検出した際の映像データが黒画像であるか否かを判定する。映像データが黒画像と判定された場合は、ステップＳ３へと進み、映像データが黒画像ではないと判定された場合は、ステップＳ１へと進む。 In step S2, the black image determination circuit 106 determines whether the video data when the current is detected in step S1 is a black image. If the video data is determined to be a black image, the process proceeds to step S3, and if it is determined that the video data is not a black image, the process proceeds to step S1.
　ステップＳ３では、表示異常検出部１０７によって、黒画像判定回路１０６によって映像データが黒画像と判定された場合に、電流検出部１０５によって検出された発光素子部へと流れる電流の電流値ＩＢが異常判定閾値電流ＩＴＨ１以上であるか比較する。電流値ＩＢが異常判定閾値電流ＩＴＨ１以上であった場合はステップＳ４へと進み、電流値ＩＢが異常判定閾値電流ＩＴＨ１未満の場合はステップＳ１へと進む。 In step S3, when the black image determination circuit 106 determines that the video data is a black image by the display abnormality detection unit 107, the current value I B of the current flowing to the light emitting element unit detected by the current detection unit 105 is Whether or not the abnormality determination threshold current I TH1 or more is compared. If the current value I B was the abnormality judgment threshold current I TH1 or proceeds to step S4, if the current value I B below abnormality judgment threshold current I TH1 proceeds to step S1.
　ステップＳ４では、電源制御回路１０８によって、駆動回路１０３への電力供給を停止する。 In step S4, the power supply control circuit 108 stops the power supply to the drive circuit 103.
　ステップＳ５では、一定時間が経過するまで、電源制御回路１０８による駆動回路１０３への電力供給の停止を継続する。 In step S5, the stop of the power supply to the drive circuit 103 by the power supply control circuit 108 is continued until a predetermined time passes.
　ステップＳ６では、電源制御回路１０８による駆動回路１０３への電力供給を停止して一定時間経過した後に、電源制御回路１０８によって駆動回路１０３への電力供給を再開する。 In step S6, after the power supply to the drive circuit 103 by the power supply control circuit 108 is stopped and a predetermined time has elapsed, the power supply control circuit 108 resumes the power supply to the drive circuit 103.
　ステップＳ６の処理後、ステップＳ１へ進む。 After the process of step S6, the process proceeds to step S1.
　図１１は、実施の形態１に係る表示装置１の構成を示すブロック図である。図１１に示すように、表示ユニット１００を２次元マトリクス状に複数並べて表示パネル１１を構成する。表示装置１は、各表示ユニット１００へ電力を供給するための電源ユニット１２に接続されており、各表示ユニット１００への電力供給は、表示ユニット制御回路１３によって制御されている。 FIG. 11 is a block diagram showing the configuration of the display device 1 according to the first embodiment. As shown in FIG. 11, the display panel 11 is configured by arranging a plurality of display units 100 in a two-dimensional matrix. The display device 1 is connected to a power supply unit 12 for supplying power to each display unit 100, and the power supply to each display unit 100 is controlled by a display unit control circuit 13.
　実施の形態１に係る表示ユニット１００は、表示異常検出部１０７により表示異常を検出することが可能であり、さらに表示異常を検出した場合に、表示異常が発生した表示ユニット１００の電源を落とすことなしに、駆動回路１０３の電源のみ落として再投入することで、復旧を図ることが可能である。 In the display unit 100 according to the first embodiment, the display abnormality detection unit 107 can detect a display abnormality, and when the display abnormality is detected, the power of the display unit 100 in which the display abnormality has occurred is turned off. Without the power supply of the drive circuit 103 only, it is possible to recover by turning it on again.
　図１１に示された表示装置１において、表示ユニット１００に表示異常が発生した場合、表示異常が発生している表示ユニット１００のみの電源を停止し再投入するため、多数の表示ユニット１００から構成される表示装置１の全体の電源を停止する必要がなく、表示異常が発生していない表示ユニット１００は表示動作を継続することができる。 In the display device 1 shown in FIG. 11, when a display abnormality occurs in the display unit 100, the display unit 100 is configured from a large number of display units 100 in order to stop the power supply of only the display unit 100 in which the display abnormality occurs. It is not necessary to stop the entire power supply of the display device 1 to be displayed, and the display unit 100 in which no display abnormality has occurred can continue the display operation.
　また、電流検出部１０５を使用して表示異常を検出するため、発光デバイスの輝度を測定する輝度測定装置が不要になるという効果が得られる。さらに、表示ユニット１００全体の電流を検出して表示異常を検出するため、各ＬＥＤ１１４に流れる電流の電流値を検出する場合、すなはち、各駆動回路１０３に流れる電流の電流値を個々に検出する場合に比べて、電流検出部１０５の数を減らすことが可能となり、装置の低コスト化を実現できる。 In addition, since the display abnormality is detected using the current detection unit 105, an effect of eliminating the need for a luminance measuring device for measuring the luminance of the light emitting device can be obtained. Furthermore, in order to detect the display abnormality by detecting the current of the entire display unit 100, when detecting the current value of the current flowing to each LED 114, the current value of the current flowing to each drive circuit 103 is individually detected. The number of current detection units 105 can be reduced as compared to the case of the above, and cost reduction of the apparatus can be realized.
　実施の形態１に係る表示ユニット１００によれば、表示異常検出部１０７により表示異常を検出することが可能であり、さらに表示異常を検出した場合に、電源制御回路１０８により駆動回路１０３への電力供給を制御して表示異常からの復旧を図ることが可能となる。 According to the display unit 100 according to the first embodiment, the display abnormality detection unit 107 can detect the display abnormality. Further, when the display abnormality is detected, the power to the drive circuit 103 is detected by the power control circuit 108. It becomes possible to control supply and to recover from display abnormalities.
実施の形態２．
　実施の形態２に係る表示ユニット２００は、黒画像判定回路１０６が出力する黒画像判定結果を表示異常検出部１０７だけでなく電流検出部２０１にも入力する構成である。実施の形態２に係る表示ユニット２００の構成を図１２に示す。なお、実施の形態１と同一または対応する構成及び動作については、その説明を省略し、実施の形態１と構成及び動作の異なる部分のみを説明する。 Second Embodiment
The display unit 200 according to the second embodiment is configured to input the black image determination result output from the black image determination circuit 106 not only to the display abnormality detection unit 107 but also to the current detection unit 201. The configuration of the display unit 200 according to the second embodiment is shown in FIG. The description of the same or corresponding configuration and operation as the first embodiment will be omitted, and only parts different from the first embodiment in configuration and operation will be described.
　図１３は、実施の形態２に係る表示ユニット２００における電流検出部２０１の構成を示すブロック図である。図１３に示すように、電流検出部２０１は、図５に示した電流検出部１０５に平均化部５０９および端子５１０を追加した構成である。端子５１０からは、黒画像判定回路１０６が出力する黒画像判定結果が入力される。 FIG. 13 is a block diagram showing the configuration of the current detection unit 201 in the display unit 200 according to the second embodiment. As shown in FIG. 13, the current detection unit 201 has a configuration in which an averaging unit 509 and a terminal 510 are added to the current detection unit 105 shown in FIG. 5. The terminal 510 inputs the black image determination result output from the black image determination circuit 106.
　平均化部５０９は、端子５１０から入力される黒画像判定結果が黒画像であることを示しているとき、アナログデジタル変換部５０５が出力する電流値ＩＢの電流平均値を算出して、電流検出結果の電流平均値ＩＢＭＮとして端子５０８へと出力する。 When the averaging unit 509 indicates that the black image determination result input from the terminal 510 is a black image, the averaging unit 509 calculates a current average value of the current value I B output from the analog-to-digital converter 505, and the current The current average value I BMN of the detection result is output to the terminal 508.
　電流検出部２０１は、平均化部５０９が出力する電流検出結果の電流平均値ＩＢＭＮを端子５０８から出力する。 The current detection unit 201 outputs the current average value IBMN of the current detection result output from the averaging unit 509 from the terminal 508.
　実施の形態２に係る表示ユニット２００における表示異常検出部１０７は、電流平均値ＩＢＭＮと、実施の形態１に記載の方法によって算出された異常判定閾値電流ＩＴＨ１とを比較することによって表示異常を検出する。 The display abnormality detection unit 107 in the display unit 200 according to the second embodiment compares the current average value I BMN with the abnormality determination threshold current I TH1 calculated by the method described in the first embodiment. To detect
　平均化部５０９の動作を図１４のタイミング図を用いて説明する。図１４は、タイミングの一例を示した図である。図１４に示すように、平均値算出周期Ｔ１の間で黒画像となっている区間ａ、区間ｂ、区間ｃの範囲を対象として電流値ＩＢの電流平均値を求めて、平均化処理を行った電流検出結果の電流平均値ＩＢＭＮを端子５０８へと出力する。その後、次の平均値算出周期Ｔ１の間で黒画像になっている区間ｄ、区間ｅの範囲を対象として電流値ＩＢの電流平均値を求めて、平均化処理を行った電流検出結果の電流平均値ＩＢＭＮを端子５０８へと出力する。つまり、平均化部５０９は、平均値算出周期Ｔ１の間で黒画像となっている区間を対象として電流値ＩＢの電流平均値を求めて、平均化処理を行った電流検出結果の電流平均値ＩＢＭＮを端子５０８へと出力する。したがって、黒画像が継続しない場合でも精度良く表示異常を検出することが可能となる。なお、平均値算出周期Ｔ１は任意の時間で設定することができる。平均値算出周期Ｔ１は、長く設定することでノイズによる影響をさらに軽減することが可能となるが、長すぎると表示異常を継続させてしまうため、数十秒から数十分の間で設定することが望ましい。 The operation of the averaging unit 509 will be described using the timing chart of FIG. FIG. 14 is a diagram showing an example of the timing. As shown in FIG. 14, the average value of the current value I B is determined for the ranges of the sections a, b, and c which are black images during the average value calculation cycle T1, and the averaging process is performed. The current average value I BMN of the current detection result is output to a terminal 508. Thereafter, the current average value of the current value I B is determined for the range of the sections d and e which are black images during the next average value calculation cycle T1, and the averaging process is performed on the current detection result. Current average value I BMN is output to terminal 508. That is, the averaging unit 509 obtains the current average value of the current value I B for the section which is a black image during the average value calculation cycle T1, and the current average of the current detection result obtained by performing the averaging process. The value I BMN is output to terminal 508. Therefore, even when the black image does not continue, it is possible to detect the display abnormality with high accuracy. The average value calculation cycle T1 can be set at an arbitrary time. It is possible to further reduce the influence of noise by setting the average value calculation cycle T1 longer, but if it is too long, the display abnormality will be continued. Is desirable.
　実施の形態２に係る表示ユニット２００では、駆動回路が１８００個程度搭載されるため、ノイズ的な電流変動が蓄積する可能性がある。したがって、駆動回路１０３では、ノイズ的な電流変動が発生する可能性がある。図１５は、実施の形態２に係る表示ユニット２００における駆動回路１０３でのノイズ的な電流変動を示す図であり、図１４の平均値算出周期Ｔ１の間での黒画像となっている区間の電流変動を示している。図１５のＱは、駆動回路１０３でのノイズ的な電流変動を示している。黒画像状態での駆動回路１０３のノイズ的な電流変動による電流検出結果への影響を抑えるために、電流検出部２０１の平均化部５０９によって、黒画像となっている区間を対象として、電流値ＩＢの平均化処理を実行する。平均化処理によって、電流変動の影響を軽減することが可能となる。平均化部５０９は、例えばＣＰＵ、マイコン等を使用して実現することが可能である。 In the display unit 200 according to the second embodiment, about 1800 drive circuits are mounted, and therefore, noise-like current fluctuations may be accumulated. Therefore, in the drive circuit 103, noise-like current fluctuations may occur. FIG. 15 is a diagram showing noise-like current fluctuation in the drive circuit 103 in the display unit 200 according to the second embodiment, in a section which is a black image during the average value calculation cycle T1 of FIG. It shows current fluctuation. Q in FIG. 15 indicates a noise-like current fluctuation in the drive circuit 103. In order to suppress the influence on the current detection result by the noise-like current fluctuation of the drive circuit 103 in the black image state, the current value is applied to the section which is a black image by the averaging unit 509 of the current detection unit 201. executing an averaging process of I B. The averaging process makes it possible to reduce the influence of current fluctuations. The averaging unit 509 can be realized using, for example, a CPU, a microcomputer, or the like.
　実施の形態２に係る表示ユニット２００では、端子５１０から入力される黒画像判定結果が黒画像であることを示している場合に、電流検出部２０１によって平均化処理を行った電流検出結果を端子５０８から出力することができるため、ノイズ的な電流変動による電流検出への影響を抑えることができ、正確な異常状態検出を行うことができる。 In the display unit 200 according to the second embodiment, when the black image determination result input from the terminal 510 indicates that the image is a black image, the current detection unit 201 performs the averaging process on the current detection result terminal. Since the output can be made from 508, the influence of the noise-like current fluctuation on the current detection can be suppressed, and accurate abnormal state detection can be performed.
実施の形態３．
　実施の形態３に係る表示ユニット３００は、実施の形態１に係る表示ユニット１００に、黒画像切り換え回路３０１を追加した構成である。映像入力回路３０１の構成を図１６に示す。なお、実施の形態１、２と同一または対応する構成及び動作については、その説明を省略し、実施の形態１、２と構成及び動作の異なる部分のみを説明する。 Third Embodiment
The display unit 300 according to the third embodiment has a configuration in which a black image switching circuit 301 is added to the display unit 100 according to the first embodiment. The configuration of the video input circuit 301 is shown in FIG. The description of the same or corresponding configurations and operations as those of the first and second embodiments will be omitted, and only portions different from the first and second embodiments in the configurations and operations will be described.
　黒画像切り換え回路３０１は、端子３０２から入力される黒画像切り替え指示により、黒画像に指示された期間、映像受信回路１０１が出力した映像データの代わりに黒画像表示に相当する黒画像データを表示制御回路１０２及び黒画像判定回路１０６へと出力する。黒画像切り替え指示が入力されていない場合は、映像受信回路１０１が出力した映像データを表示制御回路１０２及び黒画像判定回路１０６へと出力する。 The black image switching circuit 301 displays black image data corresponding to black image display instead of the video data output from the video reception circuit 101 during a period instructed to the black image by the black image switching instruction input from the terminal 302. It is output to the control circuit 102 and the black image determination circuit 106. When the black image switching instruction is not input, the video data output from the video receiving circuit 101 is output to the display control circuit 102 and the black image determination circuit 106.
　端子３０２から入力される黒画像切り替え指示は、表示切り替え等によって表示パネル１１に表示する画像の全面が黒画像表示となる際に行われる。 The black image switching instruction input from the terminal 302 is performed when a black image is displayed on the entire surface of the image displayed on the display panel 11 by display switching or the like.
　実施の形態３に係る表示ユニット３００では、表示切り替え等によって表示装置１に表示する画像の全面が黒画像表示となる際に明示的に黒画像を表示するため、表示画像に違和感を与えることなく、表示ユニット３００の表示異常によって流れる電流値をより正確に検出することができ、表示異常検出部１０７での異常判定閾値電流を求める処理を効率良く行うことが可能となる。したがって、表示装置１の各表示ユニット３００の表示異常検出の異常判断をより正確に効率よく行うことができる。 In the display unit 300 according to the third embodiment, a black image is explicitly displayed when the entire image displayed on the display device 1 becomes a black image due to display switching or the like, so that the display image does not have a sense of discomfort. The current value flowing due to the display abnormality of the display unit 300 can be detected more accurately, and the processing for obtaining the abnormality determination threshold current in the display abnormality detection unit 107 can be performed efficiently. Therefore, the abnormality judgment of the display abnormality detection of each display unit 300 of the display device 1 can be performed more accurately and efficiently.
実施の形態４．
　実施の形態４に係る表示ユニット４００は、実施の形態３に係る表示ユニット３００の黒画像切り換え回路３０１への黒画像切り替え指示が黒画像判定回路１０６から入力される構成である。実施の形態４に係る表示ユニット４００の構成を図１７に示す。なお、実施の形態１、２、３と同一または対応する構成及び動作については、その説明を省略し、実施の形態１、２、３と構成及び動作の異なる部分のみを説明する。 Fourth Embodiment
In the display unit 400 according to the fourth embodiment, a black image switching instruction to the black image switching circuit 301 of the display unit 300 according to the third embodiment is input from the black image determination circuit 106. The configuration of a display unit 400 according to the fourth embodiment is shown in FIG. The description of the same or corresponding configurations and operations as the first, second, and third embodiments will be omitted, and only portions different from the first, second, and third embodiments in configuration and operation will be described.
　図１７は、実施の形態４に係る表示ユニット４００の構成を示した図である。黒画像面切り替え回路４０１は、黒画像判定回路１０６による判定結果が黒画像を示している場合、映像受信回路１０１が出力した映像データの代わりに黒画像表示に相当する黒画像データを表示制御回路１０２へと出力する。 FIG. 17 is a diagram showing the configuration of a display unit 400 according to the fourth embodiment. When the determination result by the black image determination circuit 106 indicates a black image, the black image plane switching circuit 401 displays black image data corresponding to black image display instead of the video data output from the video reception circuit 101. Output to 102.
　実施の形態３では、表示切り替え等によって表示装置１に表示する画像の全面が黒画像表示となる際に、黒画像を明示的に表示して表示異常を検出していたが、実施の形態４に係る表示ユニット４００では、黒画像判定回路１０６が黒画像の判定を行った際に、黒画像を明示的に表示して表示異常を検出する。また、タイマー等によって、例えば一日の数時間のみ黒画像面切り替え回路４０１を動作させる構成としてもよい。 In the third embodiment, a black image is explicitly displayed to detect a display abnormality when the entire image displayed on the display device 1 becomes a black image due to display switching or the like. In the display unit 400 according to the present invention, when the black image judgment circuit 106 judges the black image, the black image is explicitly displayed to detect the display abnormality. Further, the black image plane switching circuit 401 may be operated only for several hours a day, for example, by a timer or the like.
　実施の形態４に係る表示ユニット４００では、表示ユニット毎の黒画像判定に基づいて黒画像を明示的に表示するため、表示装置１の全体の表示が黒画像でない場合においても、実施の形態３と同様の効果を奏する。 In the display unit 400 according to the fourth embodiment, the black image is explicitly displayed based on the black image determination for each display unit. Therefore, the third embodiment can be performed even when the entire display of the display device 1 is not the black image. It produces the same effect as
実施の形態５．
　実施の形態５に係る表示装置２は、実施の形態３に記載の表示ユニット３００を平面上にマトリクス状に配置した構成である。実施の形態５に係る表示装置２の構成を図１８に示す。図１８に示すように、実施の形態５に係る表示装置２では、表示ユニット３００を平面上にマトリクス状に配置して、表示パネル２１を構成している。なお、実施の形態１、２、３、４と同一または対応する構成及び動作については、その説明を省略し、実施の形態１、２、３、４と構成及び動作の異なる部分のみを説明する。 Embodiment 5
The display device 2 according to the fifth embodiment has a configuration in which the display units 300 described in the third embodiment are arranged in a matrix on a plane. The configuration of the display device 2 according to the fifth embodiment is shown in FIG. As shown in FIG. 18, in the display device 2 according to the fifth embodiment, the display unit 300 is arranged in a matrix on a plane to configure the display panel 21. The description of the same or corresponding configuration and operation as the first, second, third, and fourth embodiments will be omitted, and only the portions different in the configuration and the operation from the first, second, third, and fourth embodiments will be described. .
　実施の形態５に係る表示装置２では、一定の期間毎に、表示ユニット制御回路１３から、各表示ユニット３００に対して順次黒画像切り替え指示を出力して、映像受信回路１０１が出力した映像データの代わりに黒画像表示に相当する黒画像データを表示させる。なお、黒画像切り替え指示を入力する一定の期間は、表示装置５の設置場所等に応じて決定することができる。 In the display device 2 according to the fifth embodiment, the display unit control circuit 13 sequentially outputs a black image switching instruction to each display unit 300 every fixed period, and the video data output from the video reception circuit 101 Instead of the black image data corresponding to the black image display is displayed. In addition, the fixed period which inputs a black image switching instruction | indication can be determined according to the installation place of the display apparatus 5, etc. FIG.
　各表示ユニット３００に対して順次黒画像切り替え指示を出力するタイミングは、表示装置５の設置場所等に応じて決定することができる。 The timing at which the black image switching instruction is sequentially output to each display unit 300 can be determined according to the installation place of the display device 5 or the like.
　実施の形態５に係る表示装置２では、一定の期間毎に、各表示ユニット３００に対して順次黒画像切り替え指示を出力するため、映像受信回路１０１が出力した映像データの代わりに、黒画像表示に相当する黒画像データを表示させることができ、黒画像表示が長時間発生しない場合においても、異常表示を検出することができる。また、表示装置２の設置状況に応じて各表示ユニット３００への黒画像切り替え指示の出力タイミングを決定することができるため、表示画像に与える違和感を最小限に抑えることができる。 In the display device 2 according to the fifth embodiment, a black image display is displayed instead of the video data output from the video reception circuit 101 in order to sequentially output a black image switching instruction to each display unit 300 for each fixed period. Black image data corresponding to Y. can be displayed, and abnormal display can be detected even when black image display does not occur for a long time. In addition, since the output timing of the black image switching instruction to each display unit 300 can be determined according to the installation situation of the display device 2, it is possible to minimize the discomfort given to the display image.
　以上、実施の形態１から５では、発光素子部１０４を構成する発光素子について、ＬＥＤを一例として説明したが、他の発光素子、例えば、有機ＥＬ素子等でも良い。
　なお、本発明は、実施の形態１から５で説明した形状に限定されるものでなく、発明の範囲内において、各実施の形態を自由に組み合わせることや、各実施の形態を適宜、変形、省略することが可能である。 As described above, in the first to fifth embodiments, the light emitting element constituting the light emitting element portion 104 has been described using an LED as an example, but another light emitting element such as an organic EL element may be used.
The present invention is not limited to the shapes described in the first to fifth embodiments, and the embodiments can be freely combined within the scope of the invention, and the embodiments can be appropriately modified, It is possible to omit.
１、２　表示装置
１１、２１　表示パネル
１２　電源ユニット、１３　表示ユニット制御回路
１００、２００、３００、４００　表示ユニット
１０１　映像受信回路、１０２　表示制御回路、１０３　駆動回路、１０４　発光素子部１０５　電流検出部、１０６　黒画像判定回路１０７　表示異常検出部
１０８　電源制御回路、１１０～１１２　端子、１１４　ＬＥＤ
１１４ａ、１１４ｂ、１１４ｃ　ＬＥＤ発光源
２０１　電流検出部
３０１　黒画像面切り替え回路
４０１　黒画像面切り替え回路
５０１　電流電圧変換部、５０２　第１の増幅部、５０３　電圧制限部
５０４　第２の増幅部、５０５　アナログデジタル変換部、５０６～５０８　端子
５０９　平均化部、５１０　端子
８０１　平均値算出部、８０２　標準偏差算出部、８０３　閾値電流算出部
８０４　閾値電流記憶部、８０５　表示異常判定部、８０６～８０９　端子 Reference Numerals 1, 2 display device 11, 21 display panel 12 power supply unit, 13 display unit control circuit 100, 200, 300, 400 display unit 101 image receiving circuit 102 display control circuit 103 drive circuit 104 light emitting element unit 105 current detection unit , 106 black image judgment circuit 107 display abnormality detection unit 108 power control circuit, 110 to 112 terminals, 114 LEDs
114a, 114b, 114c LED light source 201 current detection unit 301 black image plane switching circuit 401 black image plane switching circuit 501 current voltage conversion unit, 502 first amplification unit, 503 voltage limiting unit 504 second amplification unit, 505 analog Digital converter, 506 to 508 terminals 509 averaging unit, 510 terminals 801 average value calculating unit, 802 standard deviation calculating unit, 803 threshold current calculating unit 804, threshold current storage unit, 805 display abnormality judging unit, 806 to 809 terminals

Claims (10)

  1. 　映像データを受信する映像受信手段と、
    　前記映像データに基づく映像を発光によって表示する、平面上にマトリクス状に配置された複数の発光素子からなる発光素子部と、
    　前記映像データに基づき、前記各発光素子の輝度を制御するための輝度制御信号を生成する表示制御手段と、
    　前記輝度制御信号に基づき、前記各発光素子を駆動する駆動手段と、
    　前記映像データの黒画像判定を行う黒画像判定手段と、
    　電源から前記発光素子部へと流れる電流の電流値Ｉの検出を行う電流検出手段と、
    　前記黒画像判定手段によって前記映像データが黒画像と判定された場合に、前記電流検出手段によって検出される、前記黒画像表示の期間に流れる電流の電流値ＩＢに基づき、前記発光素子部の表示異常を検出する表示異常検出手段と、
    　前記表示異常検出手段が表示異常を検出しなかった場合は、前記駆動手段への電力供給を継続し、表示異常を検出した場合は、前記駆動手段への電力供給を一定時間停止した後に再開する電源制御手段と、
    　を備える表示ユニット。     Video receiving means for receiving video data;
    A light emitting element portion composed of a plurality of light emitting elements arranged in a matrix on a plane for displaying an image based on the image data by light emission;
    Display control means for generating a luminance control signal for controlling the luminance of each of the light emitting elements based on the video data;
    Driving means for driving each of the light emitting elements based on the luminance control signal;
    Black image determining means for determining a black image of the video data;
    Current detection means for detecting a current value I of current flowing from a power supply to the light emitting element portion;
    When the video data is determined to be a black image by the black image determination means, the light emitting element portion is detected by the current detection means based on the current value I B of the current flowing during the black image display period. Display abnormality detection means for detecting display abnormality;
    When the display abnormality detection means does not detect display abnormality, the power supply to the drive means is continued, and when the display abnormality is detected, the power supply to the drive means is stopped after being stopped for a certain period of time. Power control means,
    A display unit comprising:
  2. 　前記表示異常検出手段は、
    　前記表示異常の判定基準となる異常判定閾値電流ＩＴＨ１を記憶する閾値電流記憶手段と、
    　前記電流値ＩＢと前記異常判定閾値電流ＩＴＨ１とを比較し、前記電流値ＩＢが前記異常判定閾値電流ＩＴＨ１以上となる場合に、表示異常が発生したと判定する表示異常判定手段と、
    　を備える請求項１に記載の表示ユニット。     The display abnormality detection means
    Threshold current storage means for storing an abnormality determination threshold current I TH1 serving as a determination reference of the display abnormality;
    Comparing the current value I B and the abnormality judgment threshold current I TH1, when the current value I B is the abnormality judgment threshold current I TH1 above, and determines the display abnormality determination unit and the display abnormality occurs ,
    The display unit according to claim 1, comprising:
  3. 　前記表示異常検出手段は、
    　外部から前記異常判定閾値電流ＩＴＨ１の変更指示が入力された場合に、
    　前記電流値ＩＢを前記黒画像表示の期間内で平均した電流平均値ＩＭＮ１として算出する平均値算出手段と、
    　前記黒画像表示の期間内の前記電流値ＩＢの標準偏差ＩＳＤ１を算出する標準偏差算出手段と、
    　　ＩＴＨ１＝ＩＭＮ１＋（ＩＳＤ１×３）
    　に基づき、前記異常判定閾値電流ＩＴＨ１を算出して、前記閾値電流記憶手段へと出力する閾値電流算出手段と、
    　をさらに備える請求項２に記載の表示ユニット。     The display abnormality detection means
    When an instruction to change the abnormality determination threshold current I TH1 is input from the outside,
    Average value calculation means for calculating the current value I B as a current average value I MN1 obtained by averaging within the period of the black image display;
    Standard deviation calculating means for calculating a standard deviation I SD1 of the current value I B within the black image display period;
    I TH1 = I MN1 + (I SD1 × 3)
    Threshold current calculation means for calculating the abnormality determination threshold current I TH1 based on the above and for outputting to the threshold current storage means;
    The display unit according to claim 2, further comprising:
  4. 　前記電流検出手段は、
    　前記発光素子部へと流れる電流を電圧に変換する電流電圧変換手段と、
    　前記電圧を増幅して、増幅電圧ＶＡを算出する第１の増幅手段と、
    　予め決められた閾値電圧ＶＴＨに基づき、前記増幅電圧ＶＡにおける前記閾値電圧ＶＴＨ以上の電圧をカットして、制限電圧ＶＲを算出する電圧制限手段と、
    　前記制限電圧ＶＲを増幅して、増幅制限電圧ＶＲＡを算出する第２の増幅手段と、
    　前記増幅制限電圧ＶＲＡをアナログ値からデジタル値へと変換するとともに、前記増幅制限電圧ＶＲＡを電流値へと変換して、前記電流値Ｉを算出するアナログデジタル変換手段と、
    　を備える請求項１から請求項３のいずれか１項に記載の表示ユニット。     The current detection means
    Current-voltage conversion means for converting the current flowing to the light emitting element portion into a voltage;
    First amplification means for amplifying the voltage to calculate an amplification voltage V A ;
    Based on the predetermined threshold voltage V TH, and cut the threshold voltage V TH over voltage in the amplified voltage V A, the voltage limiting means for calculating a limit voltage V R,
    Second amplification means for amplifying the limited voltage V R to calculate an amplified limited voltage V RA ;
    Analog-to-digital conversion means for converting the amplification limit voltage VRA from an analog value to a digital value and converting the amplification limit voltage VRA into a current value to calculate the current value I;
    The display unit according to any one of claims 1 to 3, comprising:
  5. 　前記電流検出手段は、平均値算出周期Ｔ１毎に、前記平均値算出周期Ｔ１内で前記黒画像表示の期間内に流れる電流を平均化処理することにより電流平均値ＩＢＭＮを算出する平均化手段をさらに備え、
    　前記表示異常検出手段は、
    　前記表示異常の判定基準となる異常判定閾値電流ＩＴＨ１を記憶する閾値電流記憶手段と、
    　前記電流値ＩＢとして前記電流平均値ＩＢＭＮを用いて、前記電流平均値ＩＢＭＮと異常判定閾値電流ＩＴＨ１とを比較し、前記電流平均値ＩＢＭＮが前記異常判定閾値電流ＩＴＨ１以上となる場合に、表示異常が発生したと判定することを特徴とする請求項１に記載の表示ユニット。     The current detection means is an averaging means for calculating the current average value I BMN by averaging the current flowing within the period of the black image display within the average value calculation cycle T1 every average value calculation cycle T1. And further
    The display abnormality detection means
    Threshold current storage means for storing an abnormality determination threshold current I TH1 serving as a determination reference of the display abnormality;
    The current average value I BMN is used as the current value I B to compare the current average value I BMN with the abnormality determination threshold current I TH1, and the current average value I BMN is greater than or equal to the abnormality determination threshold current I TH1 The display unit according to claim 1, wherein it is determined that a display abnormality has occurred.
  6. 　前記映像受信手段から前記映像データを受信し、外部からの黒画像切り替え指示に基づき、前記映像データを出力する代わりに黒画像に対応する黒画像データを前記黒画像判定手段及び前記表示制御手段へと出力する黒画像切り替え手段をさらに備える請求項１から請求項５のいずれか１項に記載の表示ユニット。 The image data is received from the image receiving means, and the black image data corresponding to the black image is output to the black image judging means and the display control means instead of outputting the image data based on the black image switching instruction from the outside. The display unit according to any one of claims 1 to 5, further comprising black image switching means for outputting the image.
  7. 　前記映像受信手段から前記映像データを受信し、前記黒画像判定手段によって前記映像データが黒画像であると判定された場合に、前記映像データを出力する代わりに黒画像に対応する黒画像データを前記黒画像判定手段及び前記表示制御手段へと出力する黒画像切り替え手段をさらに備える請求項１から請求項５のいずれか１項に記載の表示ユニット。 When the video data is received from the video receiving means, and it is determined by the black image determination means that the video data is a black image, black image data corresponding to the black image is output instead of outputting the video data. The display unit according to any one of claims 1 to 5, further comprising black image switching means for outputting the black image judgment means and the display control means.
  8. 　請求項１から請求項７のいずれか１項に記載の表示ユニットをマトリクス状に複数個配置した表示パネルと、
    　前記各表示ユニットへ電力を供給するための電源ユニットと、
    　前記電源ユニットから前記各表示ユニットへの電力供給を制御する表示ユニット制御手段と、
    　を備える表示装置。     A display panel in which a plurality of display units according to any one of claims 1 to 7 are arranged in a matrix,
    A power supply unit for supplying power to each of the display units;
    Display unit control means for controlling power supply from the power supply unit to each of the display units;
    A display device comprising:
  9. 　請求項６に記載の表示ユニットをマトリクス状に複数個配置した表示パネルと、
    　前記各表示ユニットへ電力を供給するための電源ユニットと、
    　前記電源ユニットから前記各表示ユニットへの電力供給を制御して、一定の期間毎に、前記各表示ユニットに対して順次黒画像切り替え指示を出力する表示ユニット制御手段と、
    　を備える表示装置。     A display panel in which a plurality of display units according to claim 6 are arranged in a matrix,
    A power supply unit for supplying power to each of the display units;
    Display unit control means for controlling the power supply from the power supply unit to the display units and sequentially outputting a black image switching instruction to the display units at predetermined intervals;
    A display device comprising:
  10. 　映像データを受信するステップと、
    　前記映像データに基づき、発光素子部の平面上にマトリクス状に配置された複数の発光素子に対して、前記各発光素子の輝度を制御するための輝度制御信号を生成するステップと、
    　前記輝度制御信号に基づき、駆動手段によって前記各発光素子を駆動するステップと、
    　前記発光素子部へと流れる電流値を検出するステップと、
    　前記映像データの黒画像判定を行うステップと、
    　前記映像データが黒画像と判定された場合に前記発光素子部へと流れる電流の電流値ＩＢと異常判定閾値電流ＩＴＨ１とを比較するステップと、
    　前記電流値ＩＢが前記異常判定閾値電流ＩＴＨ１以上の場合に、電源制御手段による前記駆動手段への電力供給を一定時間停止するステップと、
    　前記一定時間の経過後に、前記電源制御手段による前記駆動手段への電力供給を再開するステップと、
    　を備える表示方法。     Receiving video data;
    Generating a brightness control signal for controlling the brightness of each of the plurality of light emitting elements arranged in a matrix on the plane of the light emitting element unit based on the image data;
    Driving each of the light emitting elements by a driving unit based on the brightness control signal;
    Detecting a current value flowing to the light emitting element unit;
    Performing a black image determination of the video data;
    Comparing the current value I B of the current flowing to the light emitting element unit with the abnormality determination threshold current I TH1 when the image data is determined to be a black image;
    If the current value I B is equal to or larger than the abnormality judgment threshold current I TH1, a step of a predetermined time stopping the power supply to the drive means by the power control unit,
    Resuming power supply to the drive unit by the power control unit after the predetermined time has elapsed;
    A display method comprising:
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