WO2021125568A1 - 접점 수가 감소한 픽셀 및 디지털 구동 방법 - Google Patents
접점 수가 감소한 픽셀 및 디지털 구동 방법 Download PDFInfo
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- WO2021125568A1 WO2021125568A1 PCT/KR2020/015902 KR2020015902W WO2021125568A1 WO 2021125568 A1 WO2021125568 A1 WO 2021125568A1 KR 2020015902 W KR2020015902 W KR 2020015902W WO 2021125568 A1 WO2021125568 A1 WO 2021125568A1
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- 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
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- 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]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G2300/0857—Static memory circuit, e.g. flip-flop
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0267—Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0275—Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0286—Details of a shift registers arranged for use in a driving circuit
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/10—Display system comprising arrangements, such as a coprocessor, specific for motion video images
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- 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
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
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- 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
- G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G3/2096—Details of the interface to the display terminal specific for a flat panel
Definitions
- the present invention relates to a pixel included in a display device, and more particularly, to a pixel having two contacts connected to the outside.
- FIG. 1 is a circuit diagram schematically illustrating the structure of a general pixel.
- a pixel including three light emitting devices R, G, and B may be identified.
- a typical pixel needs 4 contacts.
- Two contacts (Vcc, GND) related to power required to drive a pixel a contact connected to a scan line that simultaneously turns on pixels arranged in a row direction (Scan), and data to which signals related to video data are input It is a contact point (Data) connected to the line.
- Such a pixel driving circuit is generally implemented through a deposition method on a semiconductor wafer, etc., but as the number of contacts increases, the transfer efficiency may be lowered.
- a pixel driving circuit smaller than a conventional pixel is required. However, this also acts as a limit in reducing the size of a pixel as the number of contacts increases.
- An object of the present specification is to provide a pixel circuit having two contacts, and to provide a method in which such a pixel circuit can operate.
- a pixel circuit according to the present specification for solving the above problems is a pixel circuit composed of a positive power terminal and a negative power terminal related to power required for driving a pixel driving circuit for driving a plurality of light emitting devices, wherein the positive power terminal is a data driving circuit connected to the furnace, and the negative power terminal may be connected to a scan driving circuit.
- the pixel driving circuit unit may include a pixel built-in memory unit for storing data related to driving of a plurality of light emitting devices input through the positive power supply terminals.
- the pixel driving circuit unit may further include a reference voltage supply unit for outputting a voltage for operating a circuit included in the pixel embedded memory unit.
- the reference voltage supply unit may output a voltage that changes together according to a change in the potential of the negative power terminal to the pixel embedded memory unit.
- the pixel embedded memory unit includes at least one shift register; and at least one flip-flop for switching the operation of the shift register.
- the pixel embedded memory unit may receive data related to driving of a plurality of light emitting devices through an output terminal of a comparator having a non-inverting input terminal connected to the positive power terminal and an inverting input terminal connected to the negative power terminal. .
- a pixel circuit includes: a display panel including a plurality of pixel circuits; a scan driving circuit connected to any one of a plurality of scan lines connected to a negative power terminal of each pixel circuit to drive pixel circuits arranged in a row direction; and a data driving circuit for outputting signals related to driving of a plurality of light emitting devices included in each pixel circuit through a plurality of data lines connected to both power terminals of each pixel circuit.
- a signal output from the data driving circuit according to the present specification may have a reference potential, a first potential higher than the reference potential, or a second potential higher than the first potential.
- the signal related to the driving of the light emitting devices may be a signal having at least one pulse that changes from a first potential to a second potential.
- the scan driving circuit may output a signal having a driving data input section of the light emitting device and a driving section of the light emitting device for each scan line.
- a signal output from the scan driving circuit according to the present specification may have a reference potential, a first potential higher than the reference potential, or a second potential higher than the first potential.
- the driving data input section may be a signal having a first potential
- the light emitting device driving section may be a signal having at least one pulse that changes from a reference potential to a first potential.
- the scan driving circuit according to the present specification may output the signal having the second potential after the driving period of the light emitting device until the driving data input period of the next frame.
- the pixel circuit can be miniaturized as much as the number of contacts is reduced, so that it is suitable for a driving circuit of a small display or micro LED.
- the signal-to-noise ratio (SNR) is increased so that accurate signal detection is possible.
- FIG. 1 is a circuit diagram schematically illustrating the structure of a general pixel.
- FIG. 2 is a display device including a plurality of pixel circuits according to the present specification.
- FIG. 3 is a block diagram schematically illustrating the configuration of a pixel circuit according to the present specification.
- FIG. 4 is a waveform diagram of a signal output to drive a pixel circuit in the display device according to the present specification.
- 5 is a timing reference diagram for the operation of one pixel circuit.
- FIG. 6 is a reference diagram of the operation of the embedded pixel memory unit in the driving data input section according to the present specification.
- FIG. 7 is a reference diagram of a comparator that outputs data related to driving of a light emitting device to a pixel embedded memory unit according to the present specification.
- FIG. 8 is a block diagram schematically illustrating a configuration of a pixel embedded memory unit according to an exemplary embodiment of the present specification.
- FIG. 2 is a display device including a plurality of pixel circuits according to the present specification.
- the display apparatus 100 may include a display panel 110 , a scan driving circuit 120 , a data driving circuit 130 , and a controller 140 .
- the display panel 110 may include a plurality of pixels (PX) according to the present specification.
- the plurality of pixels PX may be arranged in a matrix form m X n (m, n is a natural number).
- the pattern in which the plurality of pixels are arranged may be arranged in various patterns according to embodiments, such as a zigzag type.
- the display panel 110 is a liquid crystal display (LCD), a light emitting diode (LED) display, an organic LED (OLED) display, an active-matrix OLED (AMOLED) display, an electrochromic display (ECD), a digital mirror device (DMD), It may be implemented as one of AMD (Actuated Mirror Device), GLV (Grating Light Valve), PDP (Plasma Display Panel), ELD (Electro Luminescent Display), VFD (Vacuum Fluorescent Display), and other types of flat panel displays or flexible displays It may be implemented as a display. In this specification, the LED display panel will be described as an example.
- Each pixel PX may include a plurality of light emitting devices.
- the light emitting device may be a light emitting diode (LED).
- the light emitting diode may be a micro LED having a size of 80 ⁇ m or less.
- One pixel PX may output various colors through a plurality of light emitting devices having different colors.
- one pixel PX may include a light emitting device composed of red, green, and blue colors.
- the white light emitting device may replace any one of the red, green, and blue light emitting devices.
- Each light emitting element included in one pixel PX is called a 'sub pixel'.
- Each pixel PX may include a pixel driving circuit for driving a plurality of sub-pixels.
- the pixel driving circuit may drive a turn-on or turn-off operation of a sub-pixel according to a control signal output from the scan driving circuit 120 and/or the data driving circuit 130 .
- the pixel driving circuit may include at least one thin film transistor and at least one capacitor.
- the pixel driving circuit may be implemented by a stacked structure on a semiconductor wafer.
- the display panel 110 may include scan lines SL 1 to SL m arranged in a row direction and data lines DL 1 to DL n arranged in a column direction. Pixels PX may be positioned at intersections of the scan lines SL 1 to SL m and the data lines DL 1 to DL n . Each pixel PX may be connected to any one scan line SL k and any one data line DL k .
- the scan lines SL 1 to SL m may be connected to the scan driving circuit 120
- the data lines DL 1 to DL n may be connected to the data driving circuit 130 .
- the scan driving circuit 120 may drive pixels connected to any one of the scan lines SL 1 to SL m .
- the scan lines SL 1 to SL m may be sequentially selected.
- pixels connected to the first scan line SL 1 may be driven during the first scan driving period
- pixels connected to the second scan line SL 2 may be driven during the second scan driving period.
- the operation of the scan driving circuit 120 according to the present specification will be described in more detail later.
- the data driving circuit 130 may output a signal related to gradation to each pixel through the data lines DL 1 to DL n . Although one data line is connected to a plurality of pixels in the longitudinal direction, a signal related to grayscale may be input only to pixels connected to the scan line selected by the scan driving circuit 120 . The operation of the data driving circuit 130 according to the present specification will be described in more detail later.
- the control unit 140 may output a control signal to execute the operations of the scan driving circuit 120 and the data driving circuit 130 .
- the controller 140 may output a control signal corresponding to image data corresponding to one image frame to the scan driving circuit 120 and the data driving circuit 130 , respectively.
- FIG. 3 is a block diagram schematically illustrating the configuration of a pixel circuit according to the present specification.
- the pixel circuit 1000 may include a plurality of light emitting devices R/G/B and a pixel driving circuit unit 1100 .
- the plurality of light emitting devices may be micro LEDs.
- the pixel driving circuit unit 1100 serves to drive a plurality of light emitting devices. That is, the pixel driving circuit unit 1100 may play a role of controlling the plurality of light emitting devices to operate according to the color and brightness of the light to be output by the pixel for each frame.
- the positive power terminal Vcc and the negative power terminal GND are contacts related to power required for driving the plurality of light emitting devices R/G/B and the pixel driving circuit unit 1100 . Accordingly, all of the electrical energy required for the operation of the pixel circuit 1000 according to the present specification may be supplied by a potential difference between the positive power terminal Vcc and the negative power terminal GND.
- the positive power terminal Vcc may be connected to the data driving circuit 130
- the negative power terminal GND may be connected to the scan driving circuit 120 .
- the pixel circuit 1000 according to the present specification has a contacting point electrically connected to the outside composed of a positive power supply terminal Vcc and a negative power supply terminal GND. Compared with the pixel shown in FIG. 1 , it can be seen that the pixel circuit 1000 according to the present specification has two fewer contacts. Accordingly, in order to operate as a pixel of the display panel despite relatively few contacts, the positive power terminal Vcc of the pixel circuit 1000 according to the present specification is connected to the data driving circuit 130 , and the negative power terminal (GND) is characterized in that it is connected to the scan driving circuit (120). That is, the pixel circuit 1000 operates due to a potential difference between the signal output from the data driving circuit 130 and the signal output from the scan driving circuit 120 .
- the pixel driving circuit unit 1100 may include a pixel embedded memory unit 1140 .
- the pixel embedded memory unit 1140 may store data related to driving of a plurality of light emitting devices input through the positive power terminal Vcc.
- the signal related to driving of the plurality of light emitting devices may be a signal input in a digital format. That is, the display panel 110 according to the present specification may be a device having pixels of a digital driving method.
- the pixel driving circuit unit 1100 may further include a reference voltage supply unit 1120 that outputs a voltage for operating a circuit included in the pixel embedded memory unit 1140 .
- the pixel driving circuit unit 1100 may further include a bias current supply unit 1110 , a reset unit 1130 , and a light emitting device driving unit 1150 .
- the light emitting device driver 1150 is configured to drive the plurality of light emitting devices according to the driving data of each light emitting device stored in the pixel embedded memory unit.
- the light emitting device driver 1150 may be a circuit that drives the light emitting device in a pulse width modulation (PWM) method. Since the PWM driving method is a technique known to those skilled in the art, a detailed description thereof will be omitted.
- PWM pulse width modulation
- FIG. 4 is a waveform diagram of a signal output to drive a pixel circuit in the display device according to the present specification.
- a signal Sync for matching the operations of the scan driving circuit 120 and the data driving circuit 130 for each frame may be identified.
- the sync signal Sync may be output from the control unit 140 that controls the scan driving circuit 120 and the data driving circuit 130 .
- a signal output from the data driving circuit 130 is a reference potential (V 0 ), a first potential (V 1 ) higher than the reference potential (V 0 ), or a second potential (V 1 ) higher than the first potential (V 1 ) V 2 ) may have.
- the reference potential (V 0 ) may be a reference ground voltage of the display device, and the first potential (V 1 ) may have a potential difference of 0.7V or more from the reference potential (V 0 ), and the second potential (V 0 )
- the potential V 2 may have a potential difference of 0.7V or more from the first potential V 1 .
- the signal output from the data driving circuit 130 may be a signal having at least one pulse that changes from a first potential (V 1 ) to a second potential (V 2 ).
- Data of '0' or '1' may be expressed according to the length of the pulse.
- the scan driving circuit 120 may output a signal capable of driving the pixel circuit 1000 for each scan line according to the timing of the sync signal Sync.
- the signal driving the pixel circuit 1000 may have a driving data input period (RGB Program) and a light emitting element driving period (PWM Driving) of the light emitting device.
- a signal output from the scan driving circuit 120 is also a reference potential (V 0 ), a first potential (V 1 ) higher than the reference potential (V 0 ), or a second potential (V 1 ) higher than the first potential (V 1 ) It may have a potential (V 2 ).
- the reference potential (V 0 ) may be a reference ground voltage of the display device, and the first potential (V 1 ) may have a potential difference of 0.7V or more from the reference potential (V 0 ), and the second potential (V 0 )
- the potential V 2 may have a potential difference of 0.7V or more from the first potential V 1 . That is, the reference potential V 0 , the first potential V 1 , and the second potential V 2 of the signal output from the data driving circuit 130 may be the same.
- the driving data input period RGB Program may be a signal having a first potential V 1 .
- the driving data input period (RGB Program) may consist of one pulse.
- the light emitting device driving period (PWM Driving) may be a signal having at least one pulse that changes from the reference potential (V 0 ) to the first potential (V 1 ).
- the light emitting device driving section (PWM Driving) is a region for PWM driving of the light emitting device, and the number of pulses in the light emitting device driving section (PWM Driving) may correspond to a bit size of data related to driving of the light emitting device.
- the data driving circuit 130 applies a voltage between the first potential V 1 and the second potential V 2 to the positive power terminal.
- Vcc the scan driving circuit 120 may apply a voltage between the reference potential (V 0 ) and the first potential (V 1 ) to the negative power terminal (GND).
- the pixel circuit 1000 according to the present specification is generated by the potential difference between the positive power terminal Vcc and the negative power supply terminal GND. drive is possible Meanwhile, the scan driving circuit 120 may output a signal having the second potential V 2 after the light emitting device driving period (PWM Driving) and before the driving data input period (RGB Program) of the next frame. At this time, since there is little potential difference between the positive power terminal Vcc and the negative power terminal GND, the pixel circuit 1000 according to the present specification may not be driven.
- the scan driving circuit 120 may output a signal capable of sequentially driving the pixel circuit 1000 to the plurality of scan lines SL 1 to SL m .
- the scan driving circuit 120 may output a signal delayed by a preset time interval (1H) between the scan line and the scan line.
- the preset time interval 1H may be the same as the driving data input period RGB Program.
- the data driving circuit 130 may output a signal related to driving of the plurality of pixel circuits 1000 .
- the signal related to the driving of the pixel circuit 1000 is a signal including data related to the brightness of light to be output by the plurality of light emitting devices included in the pixel circuit 1000 within one frame.
- the signal output from the data driving circuit 130 to each data line DL 1 to DL n includes data corresponding to the number m of pixels arranged in the vertical direction in the display panel 110 .
- an interval between data signals related to driving of each pixel circuit 1000 by the data driving circuit 130 may be the same as the driving data input period RGB Program.
- the data driving circuit 130 shows that the data signal RGB related to the driving of the pixel circuit 1000 has the same shape, but the shape of the signal may vary depending on the color to be expressed. It should be understood that there is
- 5 is a timing reference diagram for the operation of one pixel circuit.
- a sync signal Sync output to the controller 140 may be checked to distinguish a frame from a frame.
- a signal input through the first data line DL 1 and the first scan line SL 1 may be checked.
- the signal through the first data line DL 1 is input to the positive power terminal Vcc
- the signal through the first scan line SL 1 is input to the negative power terminal GND.
- the pixel driving circuit unit 1100 may start to operate due to a potential difference between the positive power terminal Vcc and the negative power terminal GND.
- the bias current supply unit 1110 may output a bias current to the reference voltage supply unit 1120 .
- the reference voltage supply unit 1120 may output a voltage having a preset size to the reset unit 1130 , the pixel embedded memory unit 1140 , and the light emitting device driver 1150 .
- “VDD_int” is a voltage for operating circuits included in the reset unit 1130 and the internal pixel memory unit 1140
- “V-bias” is the light emitting device driver 1150 . ) to drive the voltage.
- the type and magnitude of the voltage output from the reference voltage supply unit 1120 is not limited to the examples shown in the drawings, and may be variously set.
- the reset unit 1130 may initialize the pixel embedded memory unit 1140 .
- the pixel embedded memory unit 1140 may store a signal output from the reference voltage supply unit 1120 during a driving data input period (RGB Program) after initialization, that is, a signal related to driving of light emitting devices (video data). Thereafter, the pixel embedded memory unit 1140 is respectively transmitted to the light emitting device driving unit 1150 by the PWM control signal PWM CLK input through the negative power terminal GND during the light emitting device driving period (PWM Driving).
- the pixel embedded memory unit 1140 operates in the driving data input section (RGB Program) and the light emitting device driving section (PWM Driving) will be described in more detail.
- FIG. 6 is a reference diagram of the operation of the embedded pixel memory unit in the driving data input section according to the present specification.
- the embedded pixel memory unit 1140 including the shift register 1141 can be identified.
- the pixel embedded memory unit 1140 may receive a voltage VDD_int for operating the shift register 1141 from the reference voltage supply unit 1120 .
- the shift register 1141 may be connected to the negative power terminal GND. Accordingly, the shift register 1141 may be operated by a potential difference between the voltage VDD_int output from the reference voltage supply unit 1120 and the negative power terminal GND.
- the reference voltage supply unit 1120 may output to the pixel embedded memory unit 1140 a voltage that changes together according to a change in the potential of the negative power terminal GND.
- the signal output from the scan driving circuit 120 and input through the negative power terminal GND during the driving data input period RGB Program is a reference potential V 0 to a first potential V 1 .
- the reference voltage supply unit 1120 also stores data related to driving of the light emitting device in the pixel driving circuit unit 1100 , that is, during the driving data input period (RGB Program), the potential of the negative power terminal (GND) is As much as it rises (from V 0 to V1), it is possible to output the increased voltage.
- the power VDD_int supplied from the reference voltage supply unit 1120 and the potential output from the negative power terminal GND increase simultaneously with the output from the data driving circuit 130 A specific section of the signal may be selected and input to the shift register 1141 .
- video data related to driving of the light emitting device input through the positive power supply terminal Vcc is branched and one is directly input to the shift register 1141, and the other is a low pass filter (LPF).
- LPF low pass filter
- a signal that has passed through the low-pass filter (LPF) may be input to 'CLK' of the shift register 1141 , and a signal that has not passed through the low-pass filter (LPF) is transferred to 'DATA' of the shift register 1141 . can be entered. "0" or "1" may be input through the input potential difference of the two signals.
- the pixel circuit 1000 according to the present specification further includes a comparator to improve robustness from noise of data signals related to driving of a plurality of light emitting devices input through the positive power supply terminals.
- a comparator to improve robustness from noise of data signals related to driving of a plurality of light emitting devices input through the positive power supply terminals.
- FIG. 7 is a reference diagram of a comparator that outputs data related to driving of a light emitting device to a pixel embedded memory unit according to the present specification.
- the non-inverting input terminal (Col_shift, '+') of the comparator is connected to the positive power terminal (Vcc), and the inverting input terminal (Row_shift, '-') of the comparator is the negative power terminal GND ) and the output terminal Vout of the comparator may be connected to the pixel embedded memory unit 1140.
- the power supply VDD_int supplied from the reference voltage supply unit 1120 and The potential output from the negative power terminal GND should rise simultaneously, and the voltage difference should be maintained at a specific value (eg, 0.7V or 1V) or more, but the signal output from the data driving circuit 130 is shifted In this case, when the voltage difference falls below a specific value due to an external influence, data related to driving of the light emitting device cannot be accurately input to the shift register 1141 .
- the voltage level difference between the positive power supply terminal Vcc and the negative power supply terminal GND is amplified through a comparator, and the shift register 1141 is used as data related to driving of a plurality of light emitting devices. ), accurate data input is possible despite external influences, that is, signal-to-noise characteristics can be robust.
- FIG. 8 is a block diagram schematically illustrating a configuration of a pixel embedded memory unit 1140 according to an embodiment of the present specification.
- the pixel embedded memory unit 1140 includes three shift registers and one flip-flop. Each of the shift registers may include a plurality of flip-flops.
- one pixel circuit includes three light emitting elements.
- data related to driving of each light emitting device in the one frame may be 8 bits.
- the pixel embedded memory unit 1140 may include three shift registers capable of storing 8 bits.
- the data related to the driving of each light emitting device in the one frame may be 11 bits extended from 8 bits for gamma correction or mismatch correction.
- the pixel embedded memory unit 1140 may include three shift registers capable of storing 11 bits. The three shift resists are connected in series, so that data related to driving of the light emitting device may be sequentially input.
- the pixel embedded memory unit 1140 may include at least one flip-flop for switching the operation of the shift register.
- the operation switching of the shift register means data writing and output switching in a driving data input period (RGB Program) and a light emitting device driving period (PWM Driving).
- a flip-flop for switching the operation of the shift register may be located at the end (last) of the input terminal of the shift register.
- the data output from the data driving circuit 130 may further include an additional 1 bit in addition to the data related to driving of the light emitting device.
- the additional 1 bit is included in the first part of the signal, but finally arrives at the flip-flop for switching the operation of the shift register.
- the shift register may output a signal to a switching circuit to output the stored data to the light emitting device driver 1150 .
- pixel driving circuit unit 1110 bias current supply unit
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Abstract
Description
Claims (11)
- 복수의 발광소자들을 구동시키는 픽셀구동회로부의 구동에 필요한 전력과 관련된 양전원단자와 음전원단자로 구성된 픽셀회로로서,상기 양전원단자는, 데이터구동회로에 연결되고,상기 음전원단자는, 스캔구동회로에 연결된 것을 특징으로 하는 픽셀회로.
- 청구항 1에 있어서,상기 픽셀구동회로부는, 상기 양전원단자를 통해 입력된 복수의 발광소자의 구동과 관련된 데이터를 저장하는 픽셀내장메모리부;를 포함하는 픽셀회로.
- 청구항 2에 있어서,상기 픽셀구동회로부는, 상기 픽셀내장메모리부에 포함된 회로를 동작시키기 위한 전압을 출력하는 기준전압공급부;를 더 포함하는 픽셀회로.
- 청구항 3에 있어서,상기 기준전압공급부는, 상기 음전원단자의 전위 변동에 따라 함께 변동하는 전압을 상기 픽셀내장메모리부에 출력하는 픽셀회로.
- 청구항 2에 있어서,상기 픽셀내장메모리부는, 적어도 하나 이상의 시프트 레지스터; 및 상기 시프트 레지스터의 동작 전환을 위한 적어도 하나의 플립플롭;을 포함하는 픽셀회로.
- 청구항 2에 있어서,상기 픽셀내장메모리부는, 상기 양전원단자와 연결된 비반전입력단자, 상기 음전원단자에 연결된 반전입력단자를 가진 비교기의 출력단자를 통해 복수의 발광소자의 구동과 관련된 데이터를 수신하는 픽셀회로.
- 청구항 1 내지 청구항 6에 따른 복수의 픽셀회로 중 어느 한 청구항에 따른 픽셀회로를 포함하는 디스플레이 패널;각 픽셀회로의 음전원단자와 연결된 복수의 스캔라인들 중 어느 하나 스캔라인에 연결되어 행 방향으로 배열된 픽셀회로들을 구동시키는 스캔구동회로; 및각 픽셀회로의 양전원단자와 연결된 복수의 데이터라인들을 통해 각 픽셀회로에 포함된 복수의 발광소자들의 구동과 관련된 신호를 출력하는 데이터구동회로;를 포함하는 디스플레이 장치.
- 청구항 7에 있어서,상기 데이터구동회로에서 출력되는 신호는 기준전위, 상기 기준전위보다 높은 제1 전위 또는 상기 제1 전위보다 높은 제2 전위를 가지고,상기 발광소자들의 구동과 관련된 신호는, 제1 전위에서 제2 전위로 바뀌는 적어도 하나 이상의 펄스를 가진 신호인 디스플레이 장치.
- 청구항 7에 있어서,상기 스캔구동회로는, 각 스캔라인마다 발광소자의 구동 데이터 입력 구간과 발광소자 구동 구간을 가진 신호를 출력하는 디스플레이 장치.
- 청구항 9에 있어서,상기 스캔구동회로에서 출력되는 신호는 기준전위, 상기 기준전위보다 높은 제1 전위 또는 상기 제1 전위보다 높은 제2 전위를 가지고,상기 구동 데이터 입력 구간은 제1 전위를 가진 신호이고,상기 발광소자 구동 구간은 기준전위에서 제1 전위로 바뀌는 적어도 하나 이상의 펄스를 가진 신호인 디스플레이 장치.
- 청구항 10에 있어서,상기 스캔구동회로는, 상기 발광소자 구동 구간 이후 다음 프레임의 구동 데이터 입력 구간 전까지 상기 제2 전위를 가진 신호를 출력하는 디스플레이 장치.
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KR1020200145446A KR102710653B1 (ko) | 2020-11-03 | 2020-11-03 | 신호 감지 능력이 향상된 2-pin 픽셀 회로를 포함하는 디스플레이 장치 |
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