JP4870609B2 - ADJUSTING METHOD, ADJUSTING SYSTEM, DISPLAY DEVICE, ADJUSTING DEVICE, AND COMPUTER PROGRAM - Google Patents

Description

  The present invention relates to an adjustment method for adjusting a light emission value of a display screen of a display device based on a result measured by a measurement device, an adjustment system to which the adjustment method is applied, and a display device for adjusting a light emission value by the adjustment method. In particular, the present invention relates to an adjustment device used for adjusting a light emission value of a display device by the adjustment method, and a computer program for realizing the adjustment device, and in particular, an adjustment method and an adjustment system for correcting luminance unevenness and color unevenness of the display device. The present invention relates to a display device, an adjustment device, and a computer program.

  LCDs (Liquid Crystal Display) monitors, CRT (Cathode Ray Tube) monitors, PDP (Plasma Display Panel) monitors, images displayed on display screens of projectors and other display devices have uneven brightness due to variations in manufacturing quality. There is a problem of end. For example, in the case of a liquid crystal panel used for a display screen of an LCD monitor, variations in the thickness of the liquid crystal layer, variations in operating characteristics of the driving transistor, and variations in the light emission distribution of the backlight can be exemplified as the causes of luminance unevenness.

  An example of a method for adjusting luminance unevenness will be described. First, in the manufacturing process, an image of a single gradation value is displayed on the entire display screen of the display device, the luminance distribution of the entire display screen is measured by a measuring device such as a luminance sensor, and the luminance as the measurement result is recorded. A luminance unevenness table is generated. In the luminance unevenness table, the luminance as the measurement result is recorded for each screen area obtained by dividing the entire display screen into a plurality of areas. Such a luminance unevenness table is generated for every gradation value or for each selected gradation value. Then, a luminance target value is set based on the luminance distribution recorded in the luminance unevenness table, and the luminance is adjusted by correcting the gradation value so that the set target value is obtained.

  A measuring device such as a luminance sensor for measuring the luminance of the display screen will be described. FIG. 14 is a schematic diagram showing an example of luminance measurement using a measuring apparatus. Measuring devices are roughly classified into two types: non-contact type and contact type. FIG. 14A shows the brightness of a display image displayed on a display unit 10 such as a liquid crystal panel by a measuring device 3 (a measuring device for a wide range) 3 such as a CCD camera capable of measuring a wide range in a non-contact type. Shows the situation. Since the wide range measuring apparatus 3 shown in FIG. 14A uses the entire display image of the display unit 10 as a measurement range, the brightness of the entire display image can be measured by a single measurement. FIG. 14 (b) shows a situation in which the luminance is measured by a measuring device (narrow range measuring device) 4 that is a contact type and has a narrower measuring range than the wide range measuring device 3. As shown in FIG. 14B, the measuring device 4 for narrow range uses only the surface in contact with the display screen of the display unit 10 as the measurement range, so that the brightness of the entire display screen can be measured. The measurement must be performed many times while shifting the contact position. Therefore, the wide-range measuring device 3 is used to generate the luminance unevenness table.

  Further, a specific example of a method for adjusting luminance unevenness will be described. FIG. 15 is an explanatory diagram conceptually illustrating an example of the adjustment method applied to the display device. FIG. 15A shows an image signal output from the personal computer (PC) to the display device as a displayed image, and FIG. 15B shows the image signal shown in FIG. The image of the image displayed when it displays on a display screen is shown. FIG. 15C shows the brightness adjustment processing performed in the display device as an image, and FIG. 15D shows the image signal after the adjustment processing shown in FIG. The image is shown as an image. FIG. 15B shows an image displayed by the display device that has received the input of the image signal of the image shown in FIG. 15A from the personal computer without performing the adjustment process. As shown in FIG. 15 (b), the images displayed in the upper left and lower right areas toward FIG. 15 (b) are brighter than the images displayed in other areas, and the entire screen is displayed. There is uneven brightness. Therefore, the display device performs adjustment processing shown in FIG. 15C on the input image signal shown in FIG. In the adjustment process shown in FIG. 15C, the gradation adjustment process for decreasing the gradation value is performed only on the images displayed in the upper left and lower right areas where the luminance is high. When an image based on the image signal subjected to gradation adjustment processing is displayed on the display screen as shown in FIG. 15C, the luminance unevenness of the display screen and the adjustment of the gradation value by the gradation adjustment processing are offset. Thus, as shown in FIG. 15D, an image that reproduces the input image of FIG. 15A is displayed on the display screen.

  Next, luminance adjustment by gradation adjustment will be described. FIG. 16 is a gradation characteristic diagram showing an example of the relationship between the input gradation and the output luminance. The gradation characteristic diagram shown in FIG. 16 is a gamma curve in which the horizontal axis represents the gradation of the input image signal, the vertical axis represents the luminance of the image displayed on the display screen, and the relationship is indicated by a solid line. is there. As shown in FIG. 16, since the relationship between the input gradation and the output luminance is not 1: 1, for example, when the luminance increases by 10% due to uneven luminance, the desired luminance can be obtained even if the gradation is simply decreased by 10%. In other words, luminance unevenness cannot be eliminated. Therefore, a gradation value for adjusting the luminance is calculated using a gamma curve equation of the following equation a indicating the relationship between the input gradation and the output luminance.

  Γ in Expression a is a constant specific to a display unit such as a liquid crystal panel having a display screen. For example, an LCD monitor is designed so that γ = 2.2. By transforming the equation a, the following equation b for calculating a gradation value for adjusting the luminance is derived. Then, it is possible to correct luminance unevenness by performing gradation correction processing using equation b.

  In addition to the gamma curve formula, the formula used to calculate the tone value for adjusting the luminance is not only a gamma curve formula but also a DICOM (Digital Imaging and Communication in Medicine) curve indicating the tone characteristics applied to a medical LCD monitor. There are more complex equations such as equations.

  There is also a method of avoiding complicated calculation processing by providing a display device with a table in which gradation values and luminance are associated with each other, instead of calculating gradation values for correcting luminance unevenness using mathematical expressions. .

A technique for correcting luminance unevenness of an image displayed on the display screen is disclosed in, for example, Patent Document 1 below.
Japanese Patent Laid-Open No. 3-18822

  However, there is a problem in that luminance unevenness cannot be adjusted with high accuracy because the error measured by the wide-area measurement apparatus has a large error. FIG. 17 is a schematic diagram illustrating an example of luminance measurement using a wide-range measurement apparatus. As shown in FIG. 17, the viewing angle θ of the wide-range measuring device 3 with respect to the display unit 10 varies depending on the measurement location, so that an error occurs in the luminance measurement result. In particular, when the display unit 10 is a liquid crystal panel, the variation in the amount of light with respect to the change in the viewing angle θ is significant. This is because the liquid crystal panel uses the liquid crystal alignment for image display, and thus has a viewing angle characteristic in which the transmittance and the reflectance are affected by the relationship between the direction of the liquid crystal alignment and the observation direction. Therefore, in the manufacturing process, the error based on the viewing angle θ is reduced by increasing the measurement distance between the display unit 10 and the wide range measurement device 3. However, when the measurement distance is increased, the measurement resolution is lowered and the layout of the production line is also affected. Therefore, it is difficult to increase the measurement distance to such an extent that an error based on the viewing angle θ is suppressed.

  When the narrow-range measuring device 4 shown in FIG. 14B is used, it is possible to suppress the error due to the viewing angle θ, but in order to measure the luminance of the entire display screen as described above, Since measurement must be performed many times while shifting the contact position, workability problems such as work amount and work time occur.

  Further, even in a display device in which luminance unevenness is adjusted at the time of manufacture, there is a problem that further luminance unevenness occurs due to deterioration over time. Furthermore, not only the luminance unevenness but also the color unevenness has the same problems such as workability problems and problems with deterioration over time.

  The present invention has been made in view of such circumstances, and the luminance of the entire display screen of the display device, the stimulus value of the color component, the luminescence value such as chromaticity, etc. are measured by a measuring device for a wide range, and the display screen Light emission on the display screen based on the result of correcting some measurement values measured by the measuring device for wide range based on the measurement result measured by the measuring device for narrow range. By adjusting the value, it is possible to suppress an error in the measurement result without increasing the problem of workability, and furthermore, an adjustment method that can be applied to adjustment with respect to secular change, and the adjustment method Provided are an applied adjustment system, a display device for adjusting a light emission value by the adjustment method, an adjustment device used for adjusting a light emission value of the display device by the adjustment method, and a computer program for realizing the adjustment device. Upcoming interest.

The adjustment method according to the first aspect of the present invention is the adjustment method for adjusting the emission value of the emitted light emitted from the display screen of the display device based on the result of measurement by the wide-range measurement means and the narrow-range measurement means. The range measuring means measures the emission value of the emitted light emitted from the display screen at a plurality of locations on the display screen in a range where the viewing angle with respect to the emission direction of the display screen is small. The emission value of the emitted light is measured in a range where the viewing angle with respect to the emission direction of the display screen is larger than the narrow range measuring means, and the measurement result measured by the wide range measuring means is the narrow range measuring means. based on the results but was corrected based on the ratio between the measurement results between the rate of change by the wide range measurement means in the plurality of positions in the same portion as the measurement results between the rate of change between a plurality of locations of measurement , And adjusting the light emission value of the emitted light emitted from the display screen.

An adjustment system according to a second aspect of the present invention records an adjustment value used for adjusting a light emission value of light emitted from a display screen, adjusts the light emission value based on the adjustment value, and a display of the display device In an adjustment system including an adjustment device that calculates an adjustment value to be recorded in the display device based on a result of measuring a light emission value of the screen, a light emission value of emitted light emitted from the display screen of the display device is measured Measuring means for wide range, and measuring means for narrow range for measuring the emission value of the emitted light emitted from a part of the display screen of the display device in a range in which the viewing angle with respect to the emission direction of the display screen is smaller than the wide range measuring means DOO further wherein the adjusting device, the measurement results of the extensive measurement means to measure a change in measurement results with each other between the plurality of positions measured for a plurality of locations of the narrow range measurement means the display screen Comprising a derivation means for deriving an adjustment value from the plurality of locations and results were corrected on the basis of the ratio between the wide measurement means by measurements between the rate of change in the same position as the display device, the adjustment device is derived And a recording means for recording the adjusted value.

  The adjustment system according to a third aspect of the present invention is the adjustment system according to the second aspect, wherein the range measured by the narrow-range measurement means is a local range included in the measurement range measured by the wide-range measurement means, A means for deriving an adjustment value of the local range based on a measurement result of the local range measured by the narrow range measurement means, a measurement result of the local range measured by the narrow range measurement means, and the wide range measurement means Based on the relationship of the measurement results of the range corresponding to the local range in the measured measurement range, the measurement result of the range other than the range corresponding to the local range is corrected among the measurement ranges measured by the wide-range measurement means. And means for deriving an adjustment value in a range other than the range corresponding to the local range.

  An adjustment system according to a fourth invention is the adjustment system according to the second or third invention, wherein the display device is configured to display an image of a light emission value based on a gradation value of an image signal on a display screen. The value corresponds to each gradation value and is a value indicating the light emission value of each screen area obtained by dividing the display screen into a plurality of areas. Based on the distribution of adjustment values of each screen area, the target light emission value for each gradation value And a means for correcting the gradation value based on the relationship between the adjustment value and the target light emission value.

  In the adjustment system according to a fifth aspect, in the fourth aspect, the setting means for setting the target light emission value is configured to set the same target light emission value for each screen region for each gradation value. It is characterized by.

  The adjustment system according to a sixth aspect of the present invention is characterized in that, in any one of the second to fifth aspects, the light emission value is luminance, a stimulus value of a color component, or chromaticity.

According to a seventh aspect of the present invention, there is provided a display device that records an adjustment value used for adjusting a light emission value of light emitted from a display screen, and adjusts the light emission value based on the adjustment value. Means for recording a first adjustment value based on the result of measuring the emission value of the emitted light by the measuring means for a wide range, and the emission value of the emitted light emitted from a part of the display screen. The rate of change between the measurement results between a plurality of locations measured at a plurality of locations on the display screen by the narrow range measuring means that measures the viewing angle with respect to the emission direction in a range smaller than the wide range measuring means and the same location as the plurality of locations. Based on the result of correcting the first adjustment value by the second adjustment value, the means for recording the second adjustment value for correcting the first adjustment value based on the ratio of the change rate between the measurement results by the wide range measurement means. Before Characterized in that it comprises a means for adjusting the light emission value of the display screen.

An adjustment device according to an eighth aspect of the present invention is the adjustment device for deriving an adjustment value for adjusting the emission value of the emitted light emitted from the display screen of the display device, wherein the emission light emitted from the display screen of the display device is Means for receiving a measurement result obtained by measuring a light emission value by a measuring means for a wide range; and a viewing angle with respect to an emission direction of the display screen is emitted from a part of the display screen of the display device in a range smaller than the measuring means for a wide range. The narrow range measuring means measures the measurement results measured by the wide range measuring means and the means for receiving the measurement results measured at a plurality of locations on the display screen by the narrow range measuring means for measuring the emission value of the emitted light. guiding the adjustment value from the correction result based on the measurement result between the rate of change by the wide range measurement means in the plurality of positions in the same portion as the measurement results between the rate of change between a plurality of locations that Characterized in that it comprises means for.

A computer program according to a ninth aspect of the present invention is a computer program for causing a computer to derive an adjustment value for adjusting a light emission value of emitted light emitted from a display screen of a display device. The computer program is emitted from the display screen of the display device. The display device using the narrow-range measuring means that measures the measurement result of the emission value of the emitted light by the wide-range measuring means in a range in which the viewing angle of the display screen with respect to the emission direction is smaller than the wide-area measuring means. The change rate between the measurement results between a plurality of locations obtained by measuring the luminescence values of a part of the display screen at a plurality of locations on the display screen and the change rate between the measurement results obtained by the measuring means for the wide area at the same location as the plurality of locations A procedure for deriving an adjustment value from a result corrected based on the ratio is executed.

  In the present invention, the measurement error based on the viewing angle included in the measurement result measured by the wide range measurement unit can be suppressed by correcting the measurement result by the wide range measurement unit with the measurement result by the narrow range measurement unit. In addition, since it is not necessary to measure the entire screen with the measuring means for narrow range, it is possible to suppress an increase in the work amount and work time.

  Further, in the present invention, by correcting the adjustment value of the entire display screen based on the result of measuring the light emission value of a part of the display screen, for example, luminance unevenness and color unevenness caused by secular change can be efficiently corrected. Is possible.

  An adjustment method, an adjustment system, a display device, an adjustment device, and a computer program according to the present invention measure a light emission value such as brightness of a display screen of a display device with a measuring means for a wide range, and further display the display screen of the display device. Some of the luminescence values such as luminance are measured by the narrow range measuring means having a narrower measuring range than the wide range measuring means. Then, the light emission value of the display screen is adjusted based on a result obtained by correcting the measurement result measured by the wide-range measurement unit based on the measurement result measured by the narrow-range measurement unit.

  With this configuration, in the measurement by the wide-range measurement means, it is possible to suppress an error included in the measurement result of the light emission value such as the luminance of the edge portion of the display screen in which the viewing angle becomes large. . Moreover, since it is not necessary to lengthen the measurement distance in order to suppress errors, it is possible to prevent the measurement resolution from being lowered and to prevent adverse effects on the layout of the production line. Furthermore, since it is not necessary to measure the entire screen with the measuring means for narrow range, it is possible to prevent the deterioration of workability, and there are excellent effects. By adjusting the gradation value so that an image having the same light emission value is displayed on the entire screen, it is possible to eliminate luminance unevenness, and furthermore, the light emission value such as the stimulus value and chromaticity of the color component can be eliminated. By applying it to the adjustment, it is possible to eliminate color unevenness and so on, and so on.

  Further, in the present invention, with respect to the local range measured by the narrow range measuring means, the light emission value is adjusted based on the measurement result of the narrow range measuring means, thereby eliminating errors based on the measurement by the wide range measuring means. For a range other than the local range measured by the narrow range measuring means, the work amount can be adjusted by adjusting the luminescence value based on the measurement result of the wide range measuring means and the measurement result of the narrow range measuring means. It is possible to effectively eliminate the error while suppressing the increase, and so on.

  In the present invention, for example, the adjustment value of the brightness of the entire display screen recorded in the brightness unevenness table provided in the display device is corrected based on the result of measuring the brightness of a part of the display screen, for example, generated in the manufacturing process. Since the adjustment values recorded in the brightness unevenness table can be corrected with simple measurement, it is possible to effectively correct brightness unevenness caused by secular change. Play.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. The present invention relates to a technique for eliminating display unevenness on a display screen of a display device such as a liquid crystal monitor, and is a technique for adjusting light emission values such as brightness of a display screen, stimulus values of color components, and chromaticity. In the following description, a description will be given focusing on a display unevenness related to luminance, which is one of the light emission values, that is, a mode for eliminating luminance unevenness.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing an external appearance of an example of each device used for measurement of luminance in the adjustment method according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a display device such as a liquid crystal monitor. The display device 1 includes a display unit 10 such as a liquid crystal panel. The display screen of the display unit 10 has a luminance based on the gradation value of the image signal. Is displayed. The display device 1 is connected to an adjustment device 2 using a computer such as a personal computer used for adjusting luminance unevenness of the display screen. The adjusting device 2 is connected to a measuring device such as a luminance sensor for measuring the luminance of the display screen. The display device 1 is not limited to an LCD monitor, and may be a device such as a CRT monitor, a PDP monitor, or a projector.

  FIG. 1 (a) shows that a wide range measuring device 3 such as a CCD camera capable of measuring a wide range is connected to the adjusting device 2, and the display screen of the display unit 10 is displayed on the wide range measuring device 3. It shows a state in which the overall luminance is being measured. In FIG. 1B, a contact-type narrow-range measuring device 4 having a narrower measurement range than the wide-range measuring device 3 is connected to the adjustment device 2, and the display on the display unit 10 is displayed on the narrow-range measuring device 4. This shows a state where a part of the screen is being measured.

  An image having a specific gradation value is displayed on the entire display screen on the display unit 10 of the display device 1, and the brightness of the entire display screen of the display unit 10 is measured by the wide-range measurement device 3, thereby measuring the wide range. The brightness of a local range that is a part of the measurement range measured by the device 3 is measured by the narrow range measurement device 4. In addition, the measurement of the brightness | luminance using the measuring apparatus 4 for narrow ranges is performed with respect to the local range of several places. Thereby, the relationship between the gradation value and the luminance of the image displayed on the display screen can be obtained, and the luminance distribution of the entire display screen with respect to the specific gradation value, that is, the luminance unevenness can be obtained. The brightness of the image displayed based on such gradation values is measured for all gradation values or some selected gradation values.

  FIG. 2 is a perspective view showing an example of an apparatus used for displaying an image in the adjustment method according to the first embodiment of the present invention. The display device 1 is connected to a signal output device 5 such as a personal computer that outputs an image signal. The display device 1 receives an input of an image signal output from the signal output device 5, and brightness based on the gradation value of the received image signal. Are displayed on the display screen of the display unit 10. The signal output device 5 is not limited to a personal computer, and a device such as a TV tuner, a DVD player, or a game machine may be used.

  Next, correction of the measured luminance in the adjustment method according to Embodiment 1 of the present invention will be described. In the present invention, the measurement result obtained by the wide-range measurement device 3 is corrected by the measurement result obtained by the narrow-range measurement device 4. FIG. 3 is an explanatory diagram illustrating an example of a measurement result measured by the wide-range measurement device 3 in the adjustment method according to the first embodiment of the present invention. FIG. 3 shows a measurement result obtained by displaying an image based on a specific gradation on the entire display screen of the display device 1 and measuring the displayed image by the wide-range measurement device 3. As shown in FIG. 3, even if the gradation is the same, the luminance varies depending on the position on the display screen, and luminance unevenness occurs. In the adjustment method of the present invention, the brightness is adjusted for each screen area obtained by dividing the display screen into a plurality of areas as shown in FIG. Note that since the wide-range measurement device 3 is a luminance sensor that performs measurement in a non-contact state with respect to the display screen, an error occurs in the luminance measurement result based on the viewing angle of the emitted light emitted from the display unit 10. Therefore, the luminance distribution shown in FIG. 3 is different from the actual luminance distribution.

  FIG. 4 shows an example of a measurement range measured by the narrow-range measurement device 4 in the adjustment method according to Embodiment 1 of the present invention. In the entire display screen shown in FIG. 4, the narrow-range measuring device 4 measures the luminance within the circle. In the example shown in FIG. 4, the luminance of nine local ranges is measured by the narrow range measuring device 4 in the entire display screen measured by the wide range measuring device 3. Note that the position and number of local ranges can be arbitrarily set. For example, the local range includes five local ranges in the center, upper left, upper right, lower left and lower right in the display screen. You may make it measure with the measuring device 4 for a use.

  FIG. 5 is a graph for explaining an example of correction of the measured luminance in the adjustment method according to the first embodiment of the present invention. FIGS. 5A and 5B show measurement results for horizontal scanning lines obtained by measuring the luminance of an image having a specific gradation displayed on the entire display screen of the display device 1. The horizontal distribution of the measurement luminance is shown by taking the measurement coordinates in the horizontal direction on the axis and the measurement luminance as the luminance measurement result on the vertical axis. Note that FIG. 5 shows the measurement result of the image displayed based on the gradation value “255” for displaying the image with the highest luminance among the gradation values classified into 256-level discrete values from 0 to 255. .

  In FIG. 5A, the measurement result measured by the wide-range measurement device 3 is indicated by a solid line, and the measurement result measured by the narrow-range measurement device 4 is indicated by a black circle. At the position of the measurement coordinate “Hc”, which is the central portion of the display screen, the measurement brightness by the wide-range measurement device 3 and the measurement brightness by the narrow-range measurement device 4 match with “La”. At the position of the measurement coordinate “Hl” that is the edge, the measurement luminance “Lc” by the narrow-range measurement device 4 is higher than the measurement luminance “Lb” by the wide-range measurement device 3. Even at the position of the measurement coordinate “Hr”, which is the right edge of the display screen, the measurement luminance by the narrow range measurement device 4 is higher than the measurement luminance by the wide range measurement device 3. This is because the measurement brightness near the central portion where the viewing angle is small corresponds to the measurement brightness measured by the narrow-range measurement device 4 in the measurement by the wide-range measurement device 3, but the measurement brightness near the edge where the viewing angle is large is This is because the error is large and deviates from the brightness measured by the narrow-range measuring device 4. Note that FIG. 5 shows the measurement result of luminance at a high gradation value. However, in the measurement of luminance at a low gradation value, the measurement luminance of the wide-range measurement device 3 is measured near the edge where the viewing angle is large. However, the value is higher than the brightness measured by the narrow-range measuring device 4.

  A method of correcting the measurement brightness by the wide-range measurement device 3 with the measurement brightness by the narrow-range measurement device 4 will be described. First, with respect to each measuring apparatus, the measurement brightness using the following formula 1 and formula 2 from the relationship between the measurement brightness of the measurement coordinate “Hc” that is the central portion and the measurement brightness of the measurement coordinate “H1” that is the left edge. Change rate, that is, how much the measured luminance at the edge is lower than the measured luminance at the center.

Change rate of luminance measured by wide-range measuring device 3 = (La−Lb) / La (1)
Change rate of luminance measured by measuring device 4 for narrow range = (La−Lc) / La (Formula 2)

  Next, the ratio between the respective change rates obtained by the equations 1 and 2, that is, the degree of the influence of the viewing angle on the wide-range measuring device 3 is obtained by the following equation 3.

  Ratio of change rate = change rate of the measuring device 3 for a wide range / change rate of the measuring device 4 for a narrow range: Equation 3

  And between the measurement coordinates “Hc” and the measurement coordinates “H1” that are not measured by the narrow-range measurement device 4, multiply the measurement luminance of the wide-range measurement device 3 by the ratio of the rate of change obtained by Equation 3. Thus, the measurement luminance obtained by linearly interpolating the rate of change is obtained.

  FIG. 5B shows a correction result of luminance, which is a measurement result measured by the wide-range measurement device 3, and a dotted line shows measurement luminance measured by the wide-range measurement device 3, and a solid line shows a wide range. The result of having corrected the measurement brightness | luminance by the measuring device 3 for a system with the measuring brightness | luminance by the measuring device 4 for a narrow range is shown. That is, the luminance at the position of the measurement coordinate “Hc” is the same as the luminance measured by the wide range measuring device 3 and the measured luminance by the narrow range measuring device 4. There is no. The brightness at the position of the measurement coordinate “H1” is obtained by correcting the brightness measured by the wide-range measuring device 3 to the brightness measured by the narrow-range measuring device 3 without an error based on the viewing angle. The positions not measured by the narrow-range measurement device 4 are based on the relationship between the measurement brightness “Lc” of the wide-range measurement device 3 and the measurement brightness “Lb” of the narrow-range measurement device at the measurement coordinate “Hl”. Thus, the measurement brightness of the wide-range measurement device 3 is corrected. The same correction is performed on the measurement coordinate “Hr” side. Note that the method of interpolating the luminance in the range not measured by the narrow-range measuring device 4 is not limited to the linear interpolation described above, and can be appropriately selected according to factors such as the characteristics of the display device 1.

  Next, a specific example for realizing the adjustment method according to the first embodiment of the present invention will be described. FIG. 6 is a block diagram illustrating a configuration example of the display device 1 used in the adjustment method according to the first embodiment of the present invention. The display device 1 executes an input unit 11 that receives an input of an image signal from the signal output device 5 and a process such as a conversion process on the image signal received from the input unit 11 and outputs an image signal after the conversion process The image signal output from the image processing unit 12 is output from the display unit 10 as a display image. The image signal received by the display device 1 from the signal output device 5 is a gradation value indicating the luminance classified into 256 discrete values from 0 to 255 for each of a plurality of pixels constituting the image. By displaying on the display unit 10 pixels that are data and have luminance based on gradation values, the user can visually recognize a display image that is an aggregate of pixels. Further, the display device 1 includes a connection unit 13 such as a connection port based on a standard such as a USB (Universal Serial Bus) for connecting and adjusting various types of information to the adjustment device 2.

  The image processing unit 12 includes a control unit 120 such as an MPU (Micro Processor Unit) that controls the entire image processing unit 12, an image signal input unit 121 that receives an input of an image signal received by the input unit 11, and an image signal input unit. The image signal received at 121 is temporarily recorded, the image signal conversion unit 122 that performs conversion processing on the recorded image signal, and the image signal converted by the image signal conversion unit 122 is output to the display unit 10. And an image signal output means 123 for performing the operation. If the image signal received from the input unit 11 is an analog signal, the image signal input unit 121 performs analog / digital conversion, and the image signal output unit 123 performs digital / analog conversion.

  The image processing unit 12 includes a calculation unit 124 that executes various calculation processes required for conversion of an image signal, a recording unit 125 such as a volatile memory and a nonvolatile memory that records various data used when the calculation unit 124 calculates. The image signal recorded in the image signal conversion unit 122 is converted based on the calculation result of the calculation unit 124. In the recording area of the recording unit 125, various tables and data such as a luminance unevenness table 125a and an adjustment coefficient table 125b required for image processing to be described later are recorded in advance. Although the expressions of the luminance unevenness table 125a and the adjustment coefficient table 125b are used here, they are merely expressed as an example of the innumerable recording format of the present invention, and various information to be recorded is not necessarily in the table format. It is not necessary to record, and the display device 1 is appropriately designed according to hardware, software, purpose, and other factors.

  Further, the image processing unit 12 includes an information input / output unit 126 such as a USB controller that is connected to the connection unit 13 and transmits / receives information to / from an external device connected such as the adjustment device 2.

FIG. 7 is an explanatory diagram conceptually showing an example of the recorded contents of the luminance unevenness table 125a provided in the display device 1 used in the adjustment method according to Embodiment 1 of the present invention. The luminance unevenness table 125a shown in FIG. 7 is a table created based on the luminance obtained by correcting the measurement result obtained by the measurement device 3 with the measurement result obtained by the narrow-range measurement device 4 in the wide-range measurement device 3. The luminance of each screen area displayed based on the gradation value for each screen area into which the screen is divided is shown in units of (cd / m ² ). For the brightness of each screen area, for example, an average value of brightness adjusted for all pixels in the screen area is used as a representative value of brightness in the screen area. As shown in FIG. 7, even when images based on the same gradation value are displayed, the brightness of the displayed image is distributed with a variation of 480 to 336 (cd / m ² ). The luminance recorded in the luminance unevenness table 125a is used as an adjustment value for adjusting the luminance of the display screen of the display device 1.

  A plurality of luminance unevenness tables 125a are recorded for each gradation value, and the luminance unevenness table 125a to be used is appropriately selected according to the gradation value indicated by the input image signal. However, it is not necessary to record the luminance unevenness table 125a corresponding to all gradation values. For example, the luminance unevenness table 125a corresponding to every 10 gradation values such as 0, 10, 20,... In this case, when a gradation value that is not supported by the brightness unevenness table 125a is received, the brightness shown in the brightness unevenness table 125a corresponding to another gradation value is set. A value corresponding to the received gradation value is calculated by weighted averaging.

  In FIG. 7, an example in which the display screen of the display unit 10 is divided into 48 screen areas is illustrated, but the present invention is not limited to this, and can be divided into a large number of screen areas other than 48. Furthermore, it is possible to divide each pixel. As the number of screen areas to be divided increases, higher-precision luminance unevenness correction becomes possible. Further, the luminance unevenness table 125a may be an adjustment value indicating luminance, not an adjustment value indicating luminance itself. For example, it is also possible to set a reference value such as the maximum value or average value of each luminance of each screen area, and record a value obtained by normalizing the luminance based on the set reference value as an adjustment value in the luminance unevenness table 125a. .

  FIG. 8 is an explanatory diagram conceptually showing an example of recorded contents of the adjustment coefficient table 125b provided in the display device 1 used in the adjustment method according to Embodiment 1 of the present invention. The adjustment coefficient table 125b is a table showing adjustment coefficients for adjusting gradation values for the purpose of adjusting luminance and eliminating luminance unevenness, and corresponds to gradation values and adjustment coefficients for adjusting gradation values. It is recorded with. Since the adjustment coefficient of the gradation value varies depending on the luminance adjustment amount, the adjustment coefficient table 125b is recorded for each luminance adjustment amount. The adjustment coefficient table 125b illustrated in FIG. 8 records the gradation value and the adjustment coefficient in the case of performing the adjustment for reducing the luminance by 10%. It is not necessary to prepare the adjustment coefficient table 125b corresponding to all the luminance correction amounts. For example, the adjustment coefficient table 125b for adjusting the brightness by 5%, the adjustment coefficient table 125b for reducing the brightness by 10%, and the adjustment coefficient for reducing the brightness by 20% When the table 125b is recorded in advance and adjustments of rates other than 5%, 10%, and 20% are performed, the values recorded in the respective adjustment coefficient tables 125b may be interpolated by weighted averaging. .

  FIG. 9 is a block diagram illustrating a configuration example of an apparatus such as the adjustment apparatus 2 used in the adjustment method according to the first embodiment of the present invention. The adjustment device 2 includes a control means 20 such as a CPU for controlling the entire device, and a CD-ROM drive for reading various information from a recording medium such as a CD-ROM recording various information such as the computer program 200 and data of the present invention. And the like, a recording means 22 such as a hard disk for recording various information read by the auxiliary storage means 21, and a storage means 23 such as a RAM for temporarily storing information. Then, the computer program 200 of the present invention recorded in the recording means 22 is stored in the storage means 23 and executed by the control of the control means 20, whereby the computer operates as the adjusting device 2 of the present invention. Further, the adjustment device 2 includes an input means 24 such as a mouse and a keyboard for accepting a user's operation, an output means 25 such as a monitor and a printer, a first connection means 26 connected to the display device 1, and a wide-range measurement device. 3 and a third connection means 28 connected to the narrow-range measuring device 4. The second connecting means 27 and the third connecting means 28 may be mounted by one means.

  The wide-range measuring device 3 includes a measuring unit 30 that measures the entire luminance of the display screen, and a connecting unit 31 that is connected to the adjusting device 2 and outputs the luminance as a measurement result. The narrow-range measuring device 4 includes a measuring unit 40 that measures the luminance in the local range, and a connecting unit 41 that is connected to the adjusting device 2 and outputs the luminance that is the measurement result.

  Next, processing of each device according to Embodiment 1 of the present invention will be described. First, processing at the time of measuring the luminance of the display device 1 will be described. FIG. 10 is a flowchart showing an example of processing of the adjustment device 2 according to Embodiment 1 of the present invention. The user measures the luminance of the image displayed on the display screen of the display unit 10 of the display device 1 using each device shown in FIG. The adjustment device 2 receives input of luminance in the entire range, which is a measurement result of the entire display screen measured by the wide-range measurement device 3 under the control of the control unit 20 that executes the computer program 200 stored in the storage unit 23 ( (S101) The measurement results of the entire range received are recorded in the recording means 22 in association with the coordinates indicating the position on the display screen (S102).

  Further, the adjustment device 2 receives an input of luminance, which is a measurement result of the local range measured by the narrow-range measurement device 4 under the control of the control unit 20 (S103), and displays the received measurement result of the local range on the display screen. The information is recorded in the recording means 22 in association with the coordinates indicating the upper position (S104). In step S103, input of measurement results of a plurality of local ranges, for example, nine local ranges within the entire range measured by the wide range measuring apparatus 3, is received and recorded in step S104.

  Then, the adjustment device 2 derives the luminance of the local range under the control of the control unit 20 (S105). In step S105, as described with reference to FIG. 5, for the local range, the luminance is derived based on the measurement result of the local range measured by the narrow range measuring device 4. Specifically, the measurement result of the edge of the display screen measured by the narrow range measuring device 4 is used as the luminance of the range. Note that the luminance derived in step S105 is an adjustment value used for luminance adjustment in the display device 1.

  Further, the adjustment device 2 is controlled by the control means 20 so that the measurement result of the local range measured by the narrow-range measurement device 4 and the range corresponding to the local range in the measurement range measured by the wide-range measurement device 3 are obtained. Based on the relationship between the measurement results, the measurement result measured by the wide-range measurement device 3 is corrected to derive luminance other than the local range (S106). In step S106, as described with reference to FIG. 5, the relationship between the measurement result of the local range measured by the narrow range measurement apparatus 4 and the measurement result of the local range measured by the wide range measurement apparatus 3, that is, the ratio of the change rate. And the ratio of the obtained rate of change is multiplied by the measurement result measured by the wide-range measuring device 3, thereby deriving the luminance outside the local range. Note that the luminance derived in step S106 is an adjustment value used for luminance adjustment in the display device 1.

  Then, under the control of the control unit 20, the adjustment device 2 outputs the luminance derived in steps S105 and S106 as an adjustment value from the first connection unit 26 to the display device 1 (S107). The measurement of the luminance and the output of the luminance adjustment value based on the measurement result are performed for each gradation value. In the display device 1, an input of luminance is received by the connection unit 13, and the image processing unit 12 included in the display device 1 receives luminance through the information input / output unit 126, and the received luminance is recorded as a luminance unevenness table 125a. To record.

  Next, processing when displaying an image on the display device 1 will be described. FIG. 11 is a flowchart showing an example of processing of the display device 1 according to Embodiment 1 of the present invention. The signal output device 5 outputs an image signal to the display device 1, and the display device 1 receives an input of the image signal at the input unit 11. The image processing unit 12 included in the display device 1 receives the input of the image signal by the image signal input unit 121 under the control of the control unit 120 (S201), and determines the gradation value of each pixel received as the image signal. (S202), the luminance unevenness table 125a corresponding to the representative value of the gradation value of the pixel for each screen area based on the determined gradation value, for example, the average value of the gradation value of the pixel in each screen area is selected (S203). ), Setting a target luminance as a target of luminance adjustment based on the luminance adjustment value of each screen area recorded in the selected luminance unevenness table 125a (S204). The target brightness is a value set based on the distribution of brightness adjustment values recorded in the brightness unevenness table 125a. For example, the target brightness is the lowest among the adjustment values recorded in the selected brightness unevenness table 125a. The adjustment value is set as the target brightness of each screen area.

  The image processing unit 12 included in the display device 1 extracts the brightness adjustment value of each screen area corresponding to the gradation value from the selected brightness unevenness table 125a under the control of the control unit 120 (S205). A brightness adjustment amount for adjusting the brightness adjustment value of the screen area to the set target brightness is calculated (S206). The luminance adjustment amount in step S206 is the difference between the luminance and the target luminance as shown in the following Equation 4, and is calculated for each screen area.

  Luminance adjustment amount = luminance−target luminance (Formula 4)

  The image processing unit 12 included in the display device 1 selects the adjustment coefficient table 125b for each screen area based on the luminance adjustment amount of each screen area under the control of the control unit 120 (S207), and selects each screen area. The relationship between the gradation value of the input image signal and the adjustment coefficient is extracted from the adjustment coefficient table 125b (S208), and the relationship between the gradation value of the input image signal and the gradation value for each screen area. The adjusted gradation value is calculated based on the brightness adjustment amount adjusted with the attached adjustment coefficient (S209). The gradation value adjusted in step S209 is calculated for each screen area using the following equation (5).

  Adjusted gradation value = input gradation value−luminance adjustment amount × adjustment coefficient Equation 5

  In the image processing unit 12 included in the display device 1, the control unit 120 controls the image signal output unit 123 from the image signal output unit 123 to display the image signal having each calculated adjusted gradation value as an adjustment value. The display unit 10 displays, in each screen area, a display image having a luminance value based on the gradation value based on the received image signal, that is, each gradation value adjusted for the pixels in each screen area (S210). .

  The first embodiment is merely an example of an infinite number of realization methods of the present invention, and the present invention is not limited to the first embodiment described above, and eliminates errors based on the viewing angle of the wide-range measurement device. It is possible to develop into various forms. For example, in the first embodiment, the mode in which the brightness adjustment value is derived by the adjustment device is shown. However, the present invention is not limited to this, and the measurement of the wide-range measurement device and the narrow-range measurement device is limited to this. The result can be output to the display device, and the brightness adjustment value can be derived by the display device.

  In the first embodiment, the gradation value is adjusted by using the adjustment coefficient table. However, the present invention is not limited to this, and the gradation value is calculated by calculation using an equation such as a gamma curve equation. It is possible to develop into various forms such as calculating.

Embodiment 2. FIG.
The second embodiment is performed when the luminance unevenness needs to be adjusted again due to factors such as secular change with respect to a display device in which the luminance unevenness table is already recorded. Note that the same constituent elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. FIG. 12 is a block diagram illustrating a configuration example of the display device 1 used in the adjustment method according to the second embodiment of the present invention. The display device 1 records the luminance coefficient table 125c in which the luminance coefficient used for adjusting the luminance recorded in the luminance unevenness table 125a is recorded in the recording unit 125 of the image processing unit 12. Note that the luminance recorded in advance in the luminance unevenness table 125a is a value obtained by correcting the luminance measured by the wide-range measurement device 3 with the measurement value of the narrow-range measurement device 4 as described in the first embodiment. It is also possible to record the uncorrected luminance measured by the wide range measuring device 3. The luminance coefficient table 125c is recorded in rewritable recording means 12 such as EPROM (Erasable and Programmable Read Only Memory). In the luminance coefficient table 125c, in order to adjust the luminance for each screen area recorded in the luminance unevenness table 125a, the luminance coefficient associated with each screen area is recorded, and recorded in the luminance unevenness table 125a. By multiplying the recorded luminance by the luminance coefficient recorded in the luminance coefficient table 125c, the luminance as the adjustment value can be derived.

  Next, processing of each device according to Embodiment 2 of the present invention will be described. A process at the time of measuring the luminance of the display device 1 will be described. FIG. 13 is a flowchart showing an example of processing of the adjustment device 2 according to Embodiment 2 of the present invention. The user connects the display device 1 to be adjusted to the adjustment device 2 and measures the luminance of the image displayed on the display screen of the display unit 10 of the display device 1 using the narrow-range measurement device 4. . The adjustment device 2 reads the recorded contents of the luminance unevenness table 125a from the display device 1 connected via the first connection means 26 under the control of the control means 20 that executes the computer program 200 stored in the storage means 23. Reading (S301), and the recorded contents of the read luminance unevenness table 125a are recorded in the recording means 22 (S302).

  Furthermore, the adjustment device 2 receives an input of luminance, which is a measurement result of the local range measured by the narrow-range measurement device 4 under the control of the control unit 20 (S303), and records the received measurement result of the local range in the recording unit 22. (S304). In step S303, input of measurement results of a plurality of local ranges, for example, nine local ranges is received and recorded in step S304.

  Then, the adjustment device 2 derives the luminance coefficient of the local range under the control of the control unit 20 (S305). The luminance coefficient derived in step S305 is an adjustment value to be multiplied by the luminance recorded in the luminance unevenness table 125a, and the display device 1 adjusts the luminance based on the luminance multiplied by the luminance coefficient. In step S305, the luminance is derived for the local range based on the measurement result of the local range measured by the narrow range measuring device 4 by the same method as in the first embodiment. Then, by dividing the derived luminance by the luminance recorded in the luminance unevenness table 125a, a luminance coefficient is derived as an adjustment value.

  Furthermore, the adjustment device 2 controls the brightness of the range corresponding to the local range among the measurement results of the local range measured by the narrow range measurement device 4 and the recorded content read from the luminance unevenness table 125a under the control of the control means 20. Based on the above relationship, the luminance coefficient read from the luminance unevenness table 125a is corrected to derive a luminance coefficient other than the local range (S306). In step S306, the relationship between the measurement result of the local range measured by the narrow-range measuring device 4 and the recorded content read from the luminance unevenness table 125a, that is, the rate of change rate is obtained by the same method as in the first embodiment. The brightness other than the local range is derived by multiplying the change rate ratio by the brightness other than the local range read from the brightness unevenness table 125a. Then, by dividing the derived luminance by the luminance recorded in the luminance unevenness table 125a, a luminance coefficient is derived as an adjustment value.

  Then, under the control of the control unit 20, the adjustment device 2 outputs the luminance coefficient derived in steps S305 and S306 as an adjustment value from the first connection unit 26 to the display device 1 (S307). The luminance measurement and the output of the luminance coefficient based on the measurement result are performed for each gradation value. In the display device 1, the input of the luminance coefficient is received by the connection unit 13, and the image processing unit 12 included in the display device 1 receives the luminance coefficient via the information input / output unit 126, and the received luminance coefficient is used as the luminance coefficient table 125c. Record in the recording means 125.

  When the display device 1 displays an image, the display device 1 adjusts the brightness by the same method as in the first embodiment. However, the brightness recorded in the brightness unevenness table 125a is not used as the brightness adjustment value as it is, but the brightness recorded in the brightness unevenness table 125a is multiplied by the brightness coefficient recorded in the brightness coefficient table 125c. The value is used as a brightness adjustment value.

  The second embodiment is merely an example of the innumerable implementation method of the present invention, and the present invention is not limited to the second embodiment described above, and the luminance recorded in the luminance unevenness table is corrected. It can be developed in various forms. For example, in the second embodiment, the mode in which the luminance coefficient is output from the adjustment device to the display device has been described. However, the present invention is not limited to this, and the corrected luminance may be output as the adjustment value. In that case, the display device performs luminance adjustment using the luminance received as the adjustment value.

  In Embodiments 1 and 2 described above, the present invention is applied to a monochrome image represented by one type of gradation, and the luminance is adjusted as a light emission value. However, the present invention is not limited to this, and the present invention is not limited to this. It can be applied to a color image expressed by a stimulus value, and can be developed into a form in which the stimulus value is adjusted as a light emission value, and further developed into a form in which chromaticity is adjusted as a light emission value. When applied to a color image, the adjustment method of the present invention is applied to each of the stimulation value of the Red component, the stimulation value of the Green component, and the stimulation value of the Blue component. For each color stimulus value, the luminance when displayed for each color component may be measured by the measuring device of the embodiment, or may be measured by using a measuring device capable of measuring chromaticity. Good. At that time, the luminance unevenness table may store the chromaticity itself, or may be each color stimulus value derived from the chromaticity.

In the adjustment method which concerns on Embodiment 1 of this invention, it is a perspective view which shows the external appearance of an example of each apparatus used for the measurement of a brightness | luminance. In the adjustment method which concerns on Embodiment 1 of this invention, it is a perspective view which shows an example of the apparatus used for the display of an image. In the adjustment method which concerns on Embodiment 1 of this invention, it is explanatory drawing which shows an example of the measurement result measured with the measuring apparatus for wide areas. In the adjustment method which concerns on Embodiment 1 of this invention, an example of the measurement range measured with the measuring device for narrow ranges is shown. 6 is a graph for explaining an example of correction of measured luminance in the adjustment method according to the first embodiment of the present invention. It is a block diagram which shows the structural example of the display apparatus used for the adjustment method which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows notionally an example of the recording content of the brightness nonuniformity table with which the display apparatus used with the adjustment method which concerns on Embodiment 1 of this invention is provided. It is explanatory drawing which shows notionally an example of the recording content of the adjustment coefficient table with which the display apparatus used with the adjustment method which concerns on Embodiment 1 of this invention is provided. It is a block diagram which shows the structural example of apparatuses, such as an apparatus for adjustment used for the adjustment method which concerns on Embodiment 1 of this invention. It is a flowchart which shows an example of a process of the apparatus for adjustment which concerns on Embodiment 1 of this invention. It is a flowchart which shows an example of a process of the display apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structural example of the display apparatus used for the adjustment method which concerns on Embodiment 2 of this invention. It is a flowchart which shows an example of the process of the apparatus for adjustment which concerns on Embodiment 2 of this invention. It is a schematic diagram which shows the example of a brightness | luminance measurement using a measuring apparatus. It is explanatory drawing which shows notionally an example of the adjustment method applied to a display apparatus. It is a gradation characteristic diagram showing an example of the relationship between input gradation and output luminance. It is a schematic diagram which shows the example of a brightness | luminance measurement using the measuring apparatus for wide areas.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Adjustment apparatus 3 Wide-area measurement apparatus 4 Narrow-range measurement apparatus 5 Signal output apparatus

Claims (9)

In the adjustment method for adjusting the emission value of the emitted light emitted from the display screen of the display device based on the result of measurement by the wide-range measurement means and the narrow-range measurement means,
The narrow range measuring means measures the emission value of the emitted light emitted from the display screen at a plurality of locations on the display screen in a range where the viewing angle with respect to the emission direction of the display screen is small,
The wide range measuring means measures the emission value of the emitted light emitted from the display screen in a range where the viewing angle with respect to the emission direction of the display screen is larger than the narrow range measuring means,
The measurement results measured by the wide-range measurement means are represented by the rate of change between the measurement results measured by the narrow-range measurement means and the change between the measurement results by the wide-range measurement means at the same location as the multiple locations. An adjustment method comprising adjusting an emission value of emitted light emitted from a display screen based on a result corrected based on a ratio to a rate . Recording the adjustment value used for adjusting the emission value of the emitted light emitted from the display screen, adjusting the emission value based on the adjustment value, and the result of measuring the emission value of the display screen of the display device On the basis of an adjustment system comprising an adjustment device for calculating an adjustment value to be recorded on the display device,
Measuring means for a wide range for measuring the emission value of the emitted light emitted from the display screen of the display device;
A narrow-range measuring means for measuring the emission value of the emitted light emitted from a part of the display screen of the display device in a range in which the viewing angle with respect to the emission direction of the display screen is smaller than the wide-range measuring means;
The adjustment device includes:
The measurement results measured by the wide-range measurement means, the rate of change between the measurement results measured by the narrow-range measurement means at a plurality of locations on the display screen, and the wide-range measurement means at the same location as the multiple locations. Provided with a derivation means for deriving an adjustment value from the result corrected based on the ratio of the change rate between the measurement results by
The display device
An adjustment system comprising recording means for recording an adjustment value derived by the adjustment device. The range measured by the narrow range measuring means is a local range included in the measurement range measured by the wide range measuring means,
The derivation means includes
Means for deriving an adjustment value of the local range based on the measurement result of the local range measured by the narrow range measuring means;
Based on the relationship between the measurement result of the local range measured by the narrow range measurement unit and the measurement result of the range corresponding to the local range among the measurement range measured by the wide range measurement unit, the wide range measurement unit is And a means for deriving an adjustment value of a range other than the range corresponding to the local range by correcting a measurement result of a range other than the range corresponding to the local range in the measured measurement range. Item 3. The adjustment system according to Item 2. The display device
It is configured to display an image of the light emission value based on the gradation value of the image signal on the display screen,
The adjustment value corresponds to each gradation value, and is a value indicating a light emission value of each screen area obtained by dividing the display screen into a plurality of areas,
Setting means for setting a target light emission value for each gradation value based on the distribution of adjustment values in each screen area;
The adjustment system according to claim 2, further comprising: a unit that corrects the gradation value based on a relationship between the adjustment value and the target light emission value.   5. The adjustment system according to claim 4, wherein the setting means for setting the target light emission value is configured to set the same target light emission value for each screen area for each gradation value.   6. The adjustment system according to claim 2, wherein the light emission value is a luminance, a stimulus value of a color component, or chromaticity. In a display device that records an adjustment value used to adjust a light emission value of light emitted from a display screen, and adjusts the light emission value based on the adjustment value.
Means for recording a first adjustment value based on a result of measuring a light emission value of emitted light emitted from the display screen by a wide-range measuring means;
A plurality of locations on the display screen by the narrow range measuring means for measuring the emission value of the emitted light emitted from a part of the display screen in a range in which the viewing angle relative to the exit direction of the display screen is smaller than the wide range measuring means. the second adjustment value for correcting the first adjustment value based on the ratio between the measurement results between the rate of change by the wide range measurement means in the plurality of positions in the same portion as the measurement results between the rate of change between a plurality of locations determined for Means for recording;
A display device comprising: means for adjusting a light emission value of the display screen based on a result of correcting the first adjustment value with the second adjustment value. In the adjustment device for deriving an adjustment value for adjusting the emission value of the emitted light emitted from the display screen of the display device,
Means for receiving a measurement result obtained by measuring the emission value of the emitted light emitted from the display screen of the display device by the wide-range measurement means;
The narrow- screen measuring means measures the emission value of the emitted light emitted from a part of the display screen of the display device in a range in which the viewing angle with respect to the emission direction of the display screen is smaller than the wide-area measuring means. Means for receiving measurement results measured at multiple locations ;
The measurement results measured by the wide-range measurement means are represented by the rate of change between the measurement results measured by the narrow-range measurement means and the change between the measurement results by the wide-range measurement means at the same location as the multiple locations. Means for deriving an adjustment value from a result corrected based on the rate . In a computer program for causing a computer to derive an adjustment value for adjusting a light emission value of emitted light emitted from a display screen of a display device,
The measurement result obtained by measuring the emission value of the emitted light emitted from the display screen of the display device with a wide-range measuring means is measured in a computer in a range where the viewing angle with respect to the emission direction of the display screen is smaller than the wide-area measuring means. The rate of change between the measurement results between a plurality of locations obtained by measuring the light emission values of a part of the display screen of the display device at a plurality of locations on the display screen by the measuring means for narrow range to be measured and the wide range at the same location as the plurality of locations A computer program for executing a procedure for deriving an adjustment value from a result corrected based on a ratio of a change rate between measurement results obtained by the measuring means .

Images