JP6907786B2 - Two-dimensional color measuring device and two-dimensional color measuring method - Google Patents

Description

The present invention is a technique relating to setting a light measurement area in color measurement of a color display screen.

The color measuring device calculates the photometric amount based on the color image information signal obtained from the measurement object, and calculates the chromaticity and the brightness of the measurement object based on the photometric amount. The photometric quantity is a general term for color image information signals (X signal, Y signal, Z signal) output from a two-dimensional image pickup element, and chromaticity and brightness obtained by arithmetic processing from the color image information signal. It is a physical quantity.

The two-dimensional color measuring device is provided with a two-dimensional image sensor, has a feature of being able to measure a plurality of measurement areas at the same time, and is used for color measurement of a two-dimensional area. The two-dimensional region is, for example, a screen of a color display such as a liquid crystal display or an organic electroluminescence display.

As an example of a two-dimensional color measuring device, Patent Document 1 passes through a first, second, and third optical filters that disperse light from a sample into three, and first, second, and third optical filters. A two-dimensional light receiving detection means that receives the generated light at a plurality of measurement points on the sample surface, a spectroscopic detection means that detects the spectral radiance of the light from a specific point in the measurement points, and the detected spectroscopic A calculation means for calculating the tristimulus value at a measurement point other than the specific point by using the relationship between the tristimulus value calculated based on the radiance and the detection result of the two-dimensional light receiving detection means at the specific point. A two-dimensional colorimeter equipped with the above is disclosed.

Japanese Unexamined Patent Publication No. 6-201472

FIG. 5 is a diagram showing the relationship between the color display (DUT = Device Under Test) to be measured and the two-dimensional color measuring device 300. The DUT screen (hereinafter, DUT screen 1) has pixels arranged in two dimensions. Similarly, the two-dimensional image sensor provided in the two-dimensional color measuring device 300 has pixels arranged in two dimensions. Hereinafter, the pixels of the two-dimensional image sensor will be referred to as the first pixel, and the pixels of the DUT screen 1 will be referred to as the second pixel. The second pixel is composed of, for example, a set of red subpixels, green subpixels, and blue subpixels.

The standard for measuring chromaticity and brightness defines that the number of second pixels constituting the measurement area is 500 or more (for example, IEC 62341-5-3 Measurement methods of image sticking and life). Therefore, the case where the number of the second pixels constituting the measurement area is 500 will be described. In the case of a DUT that has a structure in which red subpixels, green subpixels, and blue subpixels are repeatedly arranged only in the horizontal direction, subpixels of the same color are arranged in the vertical direction, so there is no need to consider the measurement position in the vertical direction. .. Therefore, since it may be considered in one dimension in the horizontal direction, the number of pixels in the measurement region may be considered in the measurement region of 22.4 (= √500), which is the square root of the number 500 of the second pixel. Therefore, the size corresponding to the number 22.4 of the second pixel (the size is not the area defined in the SI unit system but the relative area. The same applies hereinafter) is the photometric area. However, the number of red subpixels, the number of green subpixels, and the number of blue subpixels differ depending on the setting position of the photometric area. FIG. 24 is an explanatory diagram illustrating the relationship between the set position of the photometric region 33 and the number of sub-pixels 11 of each color in the photometric region 33. 0 to 24 arranged in the horizontal direction in the figure indicate the order of the second pixel 13. For example, "0" indicates the 0th second pixel 13. In Example 1, Example 2, and Example 3, the setting position of the metering area 33 is different from each other. In the case of Example 1, the number of red subpixels 11-r is 22, the number of green subpixels 11-g is 23, and the number of blue subpixels 11-b is 23. In the case of Example 2, the number of red subpixels 11-r is 23, the number of green subpixels 11-g is 22, and the number of blue subpixels 11-b is 23. In the case of Example 3, the number of red subpixels 11-r is 23, the number of green subpixels 11-g is 23, and the number of blue subpixels 11-b is 22.

The present inventor calculated the chromaticity xy for each of Example 1, Example 2, and Example 3 when the DUT is an LCD (Liquid Crystal Display). Similarly, when the DUT is an OLED (Organic Light Emitting Diode), the chromaticity xy was calculated for each of Example 1, Example 2, and Example 3. Since the spectral radiance is different between the LCD and the OLED, the value of the chromaticity xy is different between the LCD and the OLED. FIG. 25 is a graph showing the spectral radiance of the LCD. FIG. 26 is a graph showing the spectral radiance of the OLED. In FIGS. 25 and 26, the horizontal axis represents wavelength and the vertical axis represents spectral radiance.

The calculation results of LCD and OLED in white display are shown in Tables 1 and 2, respectively. "Max" indicates the maximum value of each chromaticity xy in Example 1, Example 2, and Example 3, and "Min" is the minimum value of each chromaticity xy in Example 1, Example 2, and Example 3. The value is shown, and “Δ” indicates the difference between “Max” and “Min”. “Δ” means a variation in chromaticity measurement caused by the positional relationship between the two-dimensional color measuring device and the DUT. In the case of an LCD, the x value of the chromaticity is 0.3157 in Example 1, 0.3189 in Example 2, and 0.3216 in Example 3. Therefore, "Max" is 0.3216, "Min" is 0.3157, and "Δ" is 0.0059. The y value of the chromaticity is 0.3155 in Example 1, 0.3090 in Example 2, and 0.3185 in Example 3. Therefore, Δ is 0.095. Further, in the case of an OLED having a wider color reproduction range than the LCD, the x value Δ of the chromaticity is 0.0071 and the y value Δ is 0.0106, which are larger than those of the LCD. In recent years, the color reproduction range of Display has become wider, and the measurement variation due to the positional relationship between the two-dimensional color measuring device and the DUT has increased. On the other hand, when the chromaticity of a light source or the like that does not have an RGB matrix type structure is measured with a chromaticity meter, the measurement accuracy of the chromaticity of the chromaticity meter is ± 0.0015, which means that the two-dimensional colorimeter and the DUT There is a problem that the measurement variation due to the positional relationship becomes larger.

The chromaticity measurement variation Δ shown in Tables 1 and 2 is when the number of each sub-pixel 11 in the photometric region 33 is 22 to 23, respectively, and when the photometric region 33 is increased (that is, in the photometric region 33). (Increase the number of second pixels 13), the measurement variation Δ of the chromaticity becomes smaller. FIG. 27 is a graph showing the relationship between the measurement variation of chromaticity and the number of second pixels 13 in the photometric region 33. The horizontal axis shows the number of the second pixels 13 in the light measuring region 33, and the vertical axis shows the measurement variation of the chromaticity x and the chromaticity y.

For example, when the number of the second pixels 13 in the photometric area 33 is 5000, it is 70.7 (= √5000). Therefore, since the number of each sub-pixel in the photometric region 33 is 70 to 71, respectively, the measurement variation of the chromaticity according to the set position of the photometric region 33 can be reduced.

On the other hand, if the photometric region 33 is excessively widened, the chromaticity and the brightness are spatially averaged, so that the evaluation of the spatial brightness, the unevenness of the chromaticity, and the uniformity of the DUT becomes insufficient. For example, the DUT has a resolution of 1920 × 1080 (the number of the second pixels 13 is 2073600), and the number of the first pixels 31 constituting the photometric region 33 is 5000.
2073600/5000 = 414

Therefore, the measurement resolution in the horizontal direction and the vertical direction is 20 × 20 (= √414).

As described above, when the amount of light measurement is obtained using a predetermined measurement area, as shown in FIG. 24, the number of red subpixels 11-r and the number of green subpixels 11-g in the light measurement area 33. There may be a difference in the number and the number of blue sub-pixels 11-b (in other words, the number of the second pixel 13 in the photometric area 33 is not necessarily an integer). As a result, even if the size of the photometric area 33 is the same, the chromaticity and the brightness are different if the set position of the photometric area 33 is different (Tables 1 and 2). That is, there is a large measurement variation in chromaticity and brightness. On the contrary, in the two-dimensional color measuring device, since the number of points for measuring the brightness and chromaticity on the DUT is large (for example, 980 × 980), the number of the second pixels 13 in the photometric area 33 is small. For example, the resolution of the DUT is 1920 × 1080, and the number of points to be measured is 980 × 980. The number of the second pixels 13 in the photometric area 33 is 2.16 (= 1920 × 1080 / (980 × 980)). Therefore, the number of each sub-pixel 11 in the light measuring area 33 becomes 2 to 3, respectively, and as can be seen from FIG. 27, there is a problem that a large measurement variation occurs.

An object of the present invention is to provide a two-dimensional color measuring device and a two-dimensional color measuring method capable of improving the measurement accuracy of a photometric quantity without making the photometric region excessively large.

The two-dimensional color measuring device according to the first aspect of the present invention that achieves the above object is a two-dimensional color measuring device that measures a plurality of measurement areas in a color display screen, and is a first two-dimensionally arranged two-dimensional color measuring device. A two-dimensional imaging unit that has pixels and captures an image of the color display screen on which a predetermined color is displayed, and a plurality of measurement regions including two or more first pixels are made to correspond to the plurality of measurement regions. The measurement area is adjusted so that the measurement variation of the measurement area corresponding to the measurement area falls within a predetermined range due to the positional relationship between the two-dimensional color measuring device and the color display screen. The first process to be performed is provided with an adjusting unit for executing each of the plurality of photometric regions.

The color display screen has a second pixel arranged in two dimensions. The second pixel includes subpixels of a plurality of colors (for example, red subpixel, green subpixel, blue subpixel). The image of a predetermined color displayed on the color display screen is, for example, a primary color image.

The adjustment unit sets a plurality of photometric regions corresponding to a plurality of measurement regions (the photometric region and the measurement region have a one-to-one correspondence), and determines the amount of metering in the measurement region corresponding to the photometric region. The first process of adjusting the photometric area is performed so that the measurement variation due to the positional relationship between the dimensional colorimeter and the color display screen falls within a predetermined range. Adjusting the metering area means changing at least one of the size and position of the metering area. For example, (1) the adjusting unit gradually changes the position of the photometric region to find a photometric region in which the measurement variation falls within a predetermined range. (2) If the measurement variation does not fall within the specified range even if the position of the photometric area is changed, the size of the photometric area is slightly widened and the position of the photometric area is gradually changed to determine the measurement variation. Find a metering area that fits within range. (3) If the measurement variation still does not fall within the predetermined range, repeat (2). Further, for example, the adjusting unit may gradually increase the size of the photometric region so as to find a photometric region in which the measurement variation falls within a predetermined range. The adjusting unit executes the first process for each of the plurality of photometric regions. Therefore, in the two-dimensional color measuring device according to the first aspect of the present invention, it is not necessary to set a relatively large photometric region in the two-dimensional color measuring device in advance in order to eliminate the measurement variation. Therefore, the measurement accuracy of the photometric quantity can be improved without making the photometric region excessively large.

In the above configuration, the adjusting unit calculates the measurement variation using the respective sizes of the normalized sub-pixels of the plurality of colors in the photometric region.

There are many ways to define the measurement variation, and it can be defined using the above size. For example, Δ% defined by the following formula is the measurement variation. This Δ% is the first example of the definition of the measurement variation of chromaticity.
Δ% = {Max (Δr, Δg, Δb) -Min (Δr, Δg, Δb)} ÷ Max (Δr, Δg, Δb)

Here, Δr, Δg, and Δb are expressed (normalized) by the following equations.
Δr = R_mes ÷ (m × R_ref)
Δg = G_mes ÷ (m × G_ref)
Δb = B_mes ÷ (m × B_ref)

Max (Δr, Δg, Δb) indicates the maximum value among Δr, Δg, and Δb. Min (Δr, Δg, Δb) indicates the minimum value among Δr, Δg, and Δb. m is the number of the second pixels (that is, the second pixels constituting the measurement area) in the measurement area. R_mes is the size of the red subpixel in the photometric area. R_ref is the size of the red subpixel included in one second pixel. G_mes is the size of the green subpixel in the photometric area. G_ref is the size of the green subpixel included in one second pixel. B_mes is the size of the blue subpixel in the photometric area. B_ref is the size of the blue subpixel included in one second pixel.

In the above configuration, in the first process, the ratio of the number of the plurality of color subpixels in the photometric region is the ratio of the number of the plurality of color subpixels constituting the second pixel. The photometric region is adjusted so that it is the same as the ratio.

According to this configuration, the ratio of the number of subpixels of a plurality of colors in the photometric area is the same as the ratio of the number of subpixels of a plurality of colors constituting the second pixel, so that the measurement variation is set to zero. be able to. For example, if the second pixel is composed of one red subpixel, one green subpixel, and one blue subpixel, the adjuster has the number of red subpixels in the photometric area: green subpixel. The metering area is adjusted so that the ratio of the number of blue subpixels to the number of blue subpixels is 1: 1: 1. In other words, when the number of the second pixels in the metering area is an integer m, the adjusting unit adjusts the metering area so that the numbers of the red subpixel, the green subpixel, and the blue subpixel are all integer m. do. For example, when the second pixel is composed of one red subpixel, two green subpixels, and one blue subpixel, the adjustment unit determines the number of red subpixels: the number of green subpixels in the photometric area. : Adjust the metering area so that the ratio of the number of blue subpixels is 1: 2: 1. In other words, when the number of the second pixel in the photometric area is an integer m, the adjustment unit has an integer m for both the red subpixel and the blue subpixel, and an integer 2m for the green subpixel. Adjust the metering area.

In the above configuration, a coordinate calculation unit for calculating the coordinates on the two-dimensional imaging unit is further provided for each of the plurality of color subpixels, and the photometric region uses the coordinates on the two-dimensional imaging unit. The adjusting unit calculates the size of each of the plurality of color subpixels in the photometric region using the coordinates.

The photometric area is represented using the coordinates on the two-dimensional imaging unit. The position of the sub-pixel is defined by the coordinates on the two-dimensional imaging unit, and the size of each of the sub-pixels of a plurality of colors in the photometric area is calculated.

In the above configuration, a coordinate calculation unit for calculating the coordinates on the two-dimensional imaging unit is further provided for each of the plurality of color sub-pixels, and the photometric region uses the coordinates on the two-dimensional imaging unit. The adjusting unit adjusts the photometric region using the coordinates.

The photometric area is represented using the coordinates on the two-dimensional imaging unit. The position of the sub-pixel is defined by the coordinates on the two-dimensional imaging unit, and the adjusting unit calculates the number of each of the sub-pixels of a plurality of colors in the photometric area. As a result, the adjusting unit adjusts the photometric area so that the ratio of the number of subpixels of a plurality of colors in the photometric area is the same as the ratio of the number of subpixels of a plurality of colors constituting the second pixel. can do.

In the above configuration, the two-dimensional imaging unit executes a second process of imaging the color display screen on which the primary color image is displayed using the subpixels of one color for each of the subpixels of the plurality of colors. The coordinate calculation unit is a subpixel used for displaying the primary color image based on the waveform of the primary color image information signal output by the two-dimensional image pickup unit when the two-dimensional image pickup unit captures the primary color image. The third process of calculating the coordinates on the two-dimensional imaging unit is executed for each of the subpixels of the plurality of colors.

According to this configuration, the coordinates of the subpixel can be calculated even in the two-dimensional imaging unit whose resolution is not high. For example, if the first pixel corresponding to a subpixel corresponds to 40% of the eighth first pixel, 100% of the ninth first pixel, and 70% of the tenth first pixel, these. Based on the waveform of the signal from the first pixel of, the coordinates of the subpixel can be obtained (coordinates (8.4 to 10.7)).

In the above configuration, the adjusting unit uses the photometric quantity of the measurement region corresponding to the photometric region and the photometric quantity of the magnified measurement region corresponding to the magnified photometric region having a larger size than the photometric region. The measurement variation is calculated.

There are many ways to define the measurement variation, and it can be defined by using the photometric amount of the measurement area and the photometric amount of the enlarged measurement area. For example, Δ defined by the following equation is the measurement variation. This Δ is the second example of the definition of the measurement variation of chromaticity.
Δ = Max (| Δx |, | Δy |)

Max (| Δx |, | Δy |) indicates the larger of | Δx | and | Δy |. Δx and Δy are represented by the following equations.
Δx = x_cal-x_true
Δy = y_cal-y_true

x_true and y_true are true chromaticity xy calculated using the magnified measurement region corresponding to the magnified photometric region. The magnified photometric area has a larger size than the initial photometric area (the photometric area before adjustment set in correspondence with the measurement area) so that the measurement variation of the chromaticity (photometric amount) does not occur. As the size of the photometric area becomes wider, the measurement variation of chromaticity becomes smaller, and when the size of the photometric area becomes larger to some extent (for example, photometry corresponding to the measurement area composed of 1000 × 1000 second pixels). Area), there is no variation in chromaticity measurement. The magnified measurement area corresponds to the magnified photometric area, and is, for example, a measurement area composed of 1000 × 1000 second pixels as described above.

x_cal and y_cal are chromaticity xy (photometric quantity) calculated using a photometric area corresponding to a normal measurement area (that is, a measurement area set when measuring a color on a color display screen).

In the above configuration, an input unit for inputting the predetermined range is further provided.

According to this configuration, the measurer can determine a predetermined range.

In the above configuration, the plurality of fourth processes for calculating the color measurement value of the measurement area based on the photometric amount of the measurement area corresponding to the photometric area adjusted by the adjustment unit by the first process. A first calculation unit is further provided for each of the measurement areas of.

According to this configuration, the color measurement value is calculated based on the photometric amount with improved measurement accuracy, so that the accuracy of the color measurement value can be improved.

In the above configuration, the plurality of fifth processes for calculating the brightness value of the measurement area based on the photometric amount of the measurement area corresponding to the photometric area adjusted by the adjustment unit by the first process. A second calculation unit that executes each of the measurement areas is further provided.

According to this configuration, the brightness value is calculated based on the photometric amount with improved measurement accuracy, so that the accuracy of the brightness value can be improved.

The two-dimensional color measuring method according to the second aspect of the present invention uses a two-dimensional color measuring device including a two-dimensional imaging unit having a first pixel arranged in two dimensions, and a plurality of measurement areas in a color display screen. This is a two-dimensional color measuring method for measuring a color, in which a plurality of measuring regions including two or more of the first pixels are set corresponding to the plurality of measuring regions, and the measurement region corresponding to the measuring region is set. Regarding the amount of light measurement, the first process of adjusting the light measurement area is applied to each of the plurality of light measurement areas so that the measurement variation due to the positional relationship between the two-dimensional color measuring device and the color display screen falls within a predetermined range. It has steps to perform against.

The two-dimensional color measuring method according to the second aspect of the present invention defines the two-dimensional color measuring device according to the first aspect of the present invention from the viewpoint of the method, and the two-dimensional color measuring method according to the first aspect of the present invention. It has the same effect as the device.

According to the present invention, the measurement accuracy of the photometric quantity can be improved without making the photometric region excessively large.

FIG. 5 is a partial plan view of an example of a two-dimensional image sensor built in the two-dimensional color measuring device of FIG. It is a partial plan view of an example of the DUT screen provided in the DUT of FIG. FIG. 5 is a plan view showing a state in which the DUT screen shown in FIG. 2 is formed on the two-dimensional image sensor shown in FIG. 1. FIG. 3 is a plan view showing a state in which a photometric region is set. It is a figure which shows the relationship between the color display (DUT) to be measured, and the two-dimensional color measuring apparatus. It is a schematic diagram of the plane of the DUT screen. It is a block diagram which shows the structure of the 2D color measuring apparatus which concerns on embodiment. It is a schematic diagram which shows an example of an optical filter. It is a schematic diagram which shows the type 1 of the 2nd pixel which constitutes the DUT screen. It is a schematic diagram which shows the type 2 of the 2nd pixel which constitutes the DUT screen. FIG. 5 is a partial plan view of an example of a DUT screen whose color is measured by the two-dimensional color measuring device according to the embodiment. It is a partial plan view of an example of a two-dimensional image sensor. FIG. 5 is a plan view showing a state in which the DUT screen shown in FIG. 10 is formed on the two-dimensional image sensor shown in FIG. It is a top view which shows the state which the line which shows the target coordinates is added with respect to FIG. It is the first half of the flowchart explaining the 1st aspect of embodiment. It is the latter half of the flowchart explaining the 1st aspect of embodiment. FIG. 12 is a plan view showing a state in which only the red subpixels are lit. It is explanatory drawing explaining the relationship between the red subpixel shown in FIG. 15, the x-coordinate, and the y-coordinate. It is explanatory drawing explaining the calculation method of the x coordinate on a two-dimensional image sensor about a red subpixel. FIG. 12 is a plan view showing a state in which only the green subpixels are lit. It is explanatory drawing explaining the relationship between the green sub-pixel shown in FIG. 18, the x-coordinate, and the y-coordinate. FIG. 12 is a plan view showing a state in which only the blue subpixels are lit. It is explanatory drawing explaining the relationship between the blue subpixel shown in FIG. 20, the x-coordinate, and the y-coordinate. It is a flowchart explaining the 2nd aspect of embodiment. It is a flowchart explaining the 3rd aspect of embodiment. It is explanatory drawing explaining the relationship between the set position of a light measuring area and the number of sub-pixels of each color in a light measuring area. It is a graph which shows the spectral radiance of an LCD. It is a graph which shows the spectral radiance of an OLED. It is a graph which shows the relationship between the measurement variation of chromaticity and the number of 2nd pixels in a photometric area.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the configuration of the two-dimensional color measuring device 300 according to the embodiment will be described. With reference to FIG. 5, an image of a predetermined color (for example, a red image, a green image, a blue image) is displayed on the DUT screen 1. The measurement target of the two-dimensional color measuring device 300 is the DUT screen 1 (an example of a color display screen). The two-dimensional color measuring device 300 sets a plurality of measuring areas on the DUT screen 1 based on the instruction of the measurer, and measures the colors of the plurality of measuring areas at the same time. FIG. 6 is a schematic view of the plane of the DUT screen 1. Here, for example, 25 measurement areas 15 are set on the DUT screen 1.

The measurement area and the photometric area will be described. FIG. 1 is a partial plan view of an example of a two-dimensional image sensor 3 built in the two-dimensional color measuring device 300 of FIG. In other words, FIG. 1 is an enlarged plan view of a part of the two-dimensional image sensor 3. In the two-dimensional image sensor 3, the first pixels 31 are arranged in a matrix. This figure shows a part of the two-dimensional image sensor 3 instead of the whole, and the number of pixels in the horizontal direction (x direction) is 28 and the number of pixels in the vertical direction (y direction) is 24. In the entire two-dimensional image pickup element 3, the number of pixels in the horizontal direction and the vertical direction is larger, for example, the number of pixels in the horizontal direction is 1000 and the number of pixels in the vertical direction is 800.

FIG. 2 is a partial plan view of an example of the DUT screen 1 provided in the DUT of FIG. In other words, FIG. 2 is an enlarged plan view of a part of the DUT screen 1. In FIGS. 1 and 2, the two-dimensional image sensor 3 and the DUT screen 1 are drawn to have substantially the same size, but the actual sizes of the two are significantly different. For example, when the DUT screen 1 is a 55-inch television, the display size in the horizontal direction is 1217 mm, and the display size in the vertical direction is 684 mm. When the two-dimensional image sensor 3 is a 1-inch size CCD, the horizontal image pickup size is 22 mm and the vertical image pickup size is 12 mm. FIG. 2 shows, in the DUT screen 1 having a structure in which the same colors are arranged in the vertical direction, the sub-pixels 11 constituting the second pixel 13 are represented by red sub-pixels 11-r, green sub-pixels 11-g, and blue sub-pixels 11. It is shown by −b.

The DUT screen 1 shown in FIG. 2 includes subpixels 11 in which subpixels 11 of the same color are arranged in the vertical direction and arranged in the order of RGB along the horizontal direction. The sub-pixels 11 are repeatedly arranged in the order of red, green, and blue. A pair of red subpixels 11-r, green subpixels 11-g, and blue subpixels 11-b constitute one second pixel 13.

FIG. 3 is a plan view showing a state in which the DUT screen 1 shown in FIG. 2 is imaged on the two-dimensional image sensor 3 shown in FIG. FIG. 3 shows a part of the two-dimensional image sensor 3 and the DUT screen 1 instead of the whole. Since the two-dimensional color measuring device 300 needs to image the entire DUT screen 1, the two-dimensional image sensor 3 is usually set to be larger than the DUT screen 1. In this figure, the first pixel 31 of the two-dimensional image sensor 3 shows a state smaller than the second pixel 13 of the DUT screen 1, but the opposite may be true.

FIG. 4 is a plan view showing a state in which the photometric region 33 is set in FIG.

The measurement area is a position on the DUT screen 1 that the measurer wants to measure, and is determined by the coordinates on the DUT screen 1 (the position of the second pixel 13 on the DUT screen 1). The number of the second pixels 13 in the measurement area is an integer.

The photometric area 33 is an area actually measured by the color measuring device. In the case of the two-dimensional color measuring device 300, the light measuring region 33 is determined by the coordinates on the two-dimensional image sensor 3 (the position of the first pixel 31 on the two-dimensional image sensor 3). For example, in the example shown in FIG. 4, the coordinates of the first pixel 31 (6, 5), the coordinates of the first pixel 31 (23, 5), the coordinates of the first pixel 31 (6, 21), and the first pixel. The region defined by the coordinates (23, 21) of 31 is defined as the photometric region 33. The number of first pixels 31 used for light measurement (the number of first pixels 31 constituting the light measurement area 33) is 306 (= 18 pixels in the horizontal direction x 17 pixels in the vertical direction).

In the case of the two-dimensional color measuring device 300, referring to FIG. 4, in the horizontal direction, the number of red subpixels 11-r is 3, the number of green subpixels 11-g is 2.2, and the number of blue subpixels 11-b. The number of is 3. Therefore, the number of the second pixels 13 in the photometric area 33 is 2.73 (≈ (3 + 2.2 + 3) / 3), and the number of the second pixels 13 in the photometric area 33 is not necessarily an integer.

As can be seen from the above description, the number of the second pixels 13 in the photometric region 33 is not an integer. In other words, the number of red subpixels 11-r, the number of green subpixels 11-g, and the number of blue subpixels 11-b are not equal. Such an event occurs because the positions of the measurement area and the photometric area 33 do not match. This is because in the case of the two-dimensional color measuring device 300, the size of the first pixel 31 of the two-dimensional image sensor 3 and the size of the second pixel 13 of the DUT screen 1 imaged on the two-dimensional image sensor 3 are different. The fact that the number of the second pixels 13 in the light measuring area 33 does not become an integer means that the measurement variation occurs due to the positional relationship between the two-dimensional color measuring device 300 and the DUT screen 1 as described in the problem.

FIG. 7 is a block diagram showing the configuration of the two-dimensional color measuring device 300. The two-dimensional color measuring device 300 includes an optical lens 301, an optical filter 302, a two-dimensional image sensor 3, a signal processing unit 303, an A / D conversion unit 304, an arithmetic processing unit 305, and a communication unit 306. To be equipped. The optical lens 301 converges the light L from the entire DUT screen 1. The light L converged by the optical lens 301 is received by the two-dimensional image sensor 3 via the optical filter 302.

The two-dimensional image sensor 3 is, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary MOS), and is an optical sensor having a two-dimensional region as a measurement range. The two-dimensional image sensor 3 receives light L through the optical filter 302 to capture an image of a predetermined color displayed on the entire DUT screen 1, and an electric signal (image) indicating information on the captured image. Information signal SG) is output. The image information signal SG is a color image information signal when a plurality of primary colors are displayed on the DUT screen 1 at the same time, and is a primary color image information signal when the primary colors (for example, red) are displayed on the DUT screen 1.

The optical filter 302 will be described with reference to FIG. FIG. 8 is a schematic view showing an example of the optical filter 302. The optical filter 302 is a rotary filter including an X filter 302a that transmits the X component, a Y filter 302b that transmits the Y component, a Z filter 302c that transmits the Z component, and a disk-shaped holder 302d that holds these filters. Is. The holder 302d is formed with four through-hole portions 302e, 302f, 302g, and 302h at equal intervals in the circumferential direction. An X filter 302a is fitted in the through-hole portion 302e, and the light L passing through the through-hole portion 302e passes through the X-filter 302a. A Y filter 302b is fitted in the through port portion 302f, and the light L passing through the through port portion 302f passes through the Y filter 302b. A Z filter 302c is fitted in the through port portion 302g, and the light L passing through the through port portion 302g passes through the Z filter 302c. Since the filter is not fitted in the through-hole portion 302h, the light L passing through the through-hole portion 302h does not pass through the filter.

The X filter 302a is set so that the spectral sensitivity of the first pixel 31 and the combined spectral response of the X filter 302a are x (λ) defined by CIE 1931. The Y filter 302b is set so that the spectral sensitivity of the first pixel 31 and the combined spectral response of the Y filter 302b are y (λ) defined by CIE 1931. The Z filter 302c is set so that the spectral sensitivity of the first pixel 31 and the combined spectral response of the Z filter 302c are z (λ) defined by CIE 1931. The holder 302d is rotated by a rotation mechanism (not shown), and the positions of the X filter 302a, the Y filter 302b, and the Z filter 302c can be sequentially switched to positions facing the two-dimensional image sensor 3. The two-dimensional image sensor 3 receives the light L transmitted through the filter at a position facing the two-dimensional image sensor 3.

The two-dimensional image pickup unit 310 is configured by the optical filter 302 and the two-dimensional image pickup element 3. The two-dimensional imaging unit 310 has a structure in which the first pixels 31 are arranged two-dimensionally, and images an image of a predetermined color displayed on the DUT screen 1 (an example of a color display screen).

The signal processing unit 303 is a circuit that performs known signal processing on the image information signal SG output from the two-dimensional image sensor 3. For example, when the two-dimensional image sensor 3 is a CCD, the signal processing unit 303 includes a CDS (Correlated Double Sample), and the CDS removes reset noise from the image information signal SG.

The A / D conversion unit 304 is a circuit that converts the image information signal SG, which has been signal-processed by the signal processing unit 303, from analog to digital.

The arithmetic processing unit 305 executes various settings and calculations necessary for measuring chromaticity and brightness. The arithmetic processing unit 305 is a microcomputer realized by a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. The arithmetic processing unit 305 includes an image storage unit 307, an adjustment unit 308, a coordinate calculation unit 309, a coordinate storage unit 310, a first calculation unit 311 and a second calculation unit 312 as functional blocks. These will be described later.

It should be noted that some or all of the functions of the arithmetic processing unit 305 may be realized by processing by the DSP (Digital Signal Processor) in place of or in combination with the processing by the CPU. Similarly, a part or all of the functions of the arithmetic processing unit 305 may be realized by processing by a dedicated hardware circuit in place of or in combination with processing by software.

The communication unit 306 is a communication interface that communicates with an external PC (Personal Computer) 400 of the two-dimensional color measuring device 300. By operating the PC 400, the measurer can set various settings necessary for color measurement of the DUT screen 1 with respect to the two-dimensional color measurement device 300 (for example, designation of the center position of the measurement area 15 and the number of measurement areas 15). , Command to execute color measurement, etc.

There are various types of second pixels 13 constituting the DUT screen 1. Here, two types will be described. FIG. 9A is a schematic view showing type 1 of the second pixel 13 constituting the DUT screen 1. FIG. 9B is a schematic view showing type 2 of the second pixel 13 constituting the DUT screen 1. With reference to FIG. 9A, type 1 of the second pixel 13 is composed of one red subpixel 11-r, one green subpixel 11-g, and one blue subpixel 11-b. With reference to FIG. 9B, type 2 of the second pixel 13 is composed of one red subpixel 11-r, two green subpixels 11-g, and one blue subpixel 11-b.

As described with reference to FIG. 6, the measurer designates a plurality of measurement areas 15 on the DUT screen 1. The two-dimensional color measuring device 300 calculates the target coordinates based on this. The target coordinates are the coordinates on the two-dimensional image sensor 3, and the photometric region 33 (FIG. 4) is determined based on the target coordinates. The calculation of the target coordinates will be described. FIG. 10 is a partial plan view of an example of the DUT screen 1 whose color is measured by the two-dimensional color measuring device 300 according to the embodiment. In this figure, 25 second pixels 13 are shown. The number of the second pixels 13 in the x direction (horizontal direction) is five, and the number of the second pixels 13 in the y direction (vertical direction) is five. In the entire DUT screen 1, the number of the second pixels 13 is, for example, 2703600 (= 1920 × 1080). The second pixel 13 is a type 1 shown in FIG. 9A. The numbers 1 to 5 arranged in the x direction indicate the value of the x coordinate on the DUT screen 1. The numbers 1 to 5 arranged in the y direction indicate the value of the y coordinate on the DUT screen 1.

The measurer operates the PC 400 (FIG. 7) to specify the coordinates (center position of the measurement area 15) of the second pixel 13 as the measurement point. For example, it is assumed that the second pixel 13 located at the coordinates (3, 3) is designated. The arithmetic processing unit 305 sets the measurement area 15 around the second pixel 13. It is assumed that the number of the second pixels 13 constituting the measurement area 15 is set to, for example, nine. The arithmetic processing unit 305 includes the designated second pixel 13, and sets a measurement area 15 composed of nine second pixels 13 around the second pixel 13. Here, the second pixel 13 of the coordinates (2,2), the second pixel 13 of the coordinates (3,2), the second pixel 13 of the coordinates (4,2), and the second pixel 13 of the coordinates (2,3). , 2nd pixel 13 of coordinates (3,3), 2nd pixel 13 of coordinates (4,3), 2nd pixel 13 of coordinates (2,4), 2nd pixel 13 of coordinates (3,4), and , The measurement area 15 composed of the second pixel 13 of the coordinates (4, 4) is set.

FIG. 11 is a partial plan view of an example of the two-dimensional image sensor 3. The two-dimensional image sensor 3 shown in this figure has the same configuration as the two-dimensional image sensor 3 shown in FIG. The numbers 1 to 46 arranged in the x direction indicate the value of the x coordinate on the two-dimensional image sensor 3. The numbers 1 to 46 arranged in the y direction indicate the value of the y coordinate on the two-dimensional image sensor 3. Actually, the number of the first pixels 31 constituting the two-dimensional image sensor 3 is, for example, 8294400 (= 3840 × 2160). FIG. 11 corresponds to FIG. 10, and 2500 (= 50 × 50) first pixels 31 are shown.

FIG. 12 is a plan view showing a state in which the DUT screen 1 shown in FIG. 10 is imaged on the two-dimensional image sensor 3 shown in FIG. FIG. 13 is a plan view showing a state in which a line indicating the target coordinates indicating the center coordinates of the measurement region 15 is added to FIG. 12. Only the second pixel 13 which is the measurement point specified by the measurer is lit (red subpixel 11-r, green subpixel 11-g, and blue subpixel 11-b are lit, so that a white point is displayed. NS). The two-dimensional image sensor 3 captures an image of the DUT screen 1 in this state, and the arithmetic processing unit 305 calculates the target coordinates using this image. When the measurement point is the second pixel 13 represented by the coordinates (3, 3), the target coordinate is the coordinate corresponding to the center of the second pixel 13. Here, the target coordinates (Target_x, Target_y) are set to, for example, (28.4, 24.0).

An image (x) in which the second pixel 13 including the second pixel 13 as a measurement point is lit and the second pixel 13 including the second pixel 13 is lit in the y direction. The target coordinates may be calculated using an image in which a white line extending in the direction and a white line extending in the y direction are displayed). The intersection of the white line extending in the x direction and the white line extending in the y direction is the target coordinate.

With reference to FIGS. 4, 5 and 6, the measurer sets a plurality of measurement areas 15 on the DUT screen 1, and the two-dimensional colorimeter 300 has a plurality of measurement areas 15 corresponding to each of the plurality of measurement areas 15. A photometric region 33 (FIG. 4) is set, and the photometric quantity (for example, chromaticity) of each of the plurality of measurement regions 15 is measured. As described above, the number of the second pixels 13 in the photometric region 33 is not necessarily an integer, and this is the measurement variation of the photometric amount depending on the positional relationship between the two-dimensional colorimeter 300 and the DUT screen 1 (hereinafter, "" It causes the occurrence of "measurement variation in photometric amount"). The adjusting unit 308 (FIG. 7) executes the first process of adjusting the photometric area 33 for each of the plurality of photometric areas 33 so that the measurement variation of the photometric amount in the measurement area 15 falls within a predetermined range. .. In the embodiment, there are the first mode to the third mode as a method of keeping the measurement variation of the photometric amount within a predetermined range. As a photometric quantity, chromaticity will be described as an example. Although one of the plurality of photometric regions 33 will be described as an example, the same applies to the other photometric regions 33.

The first aspect of the embodiment will be described first. In the first aspect of the embodiment, as the measurement variation of the chromaticity, the measurement variation Δ% represented by the following formula is used. This Δ% is the first example of the definition of the measurement variation of chromaticity.
Δ% = {Max (Δr, Δg, Δb) -Min (Δr, Δg, Δb)} ÷ Max (Δr, Δg, Δb) ... Equation 1

Here, Δr, Δg, and Δb are represented by the following equations.
Δr = R_mes ÷ (m × R_ref) ・ ・ ・ Equation 2
Δg = G_mes ÷ (m × G_ref) ・ ・ ・ Equation 3
Δb = B_mes ÷ (m × B_ref) ・ ・ ・ Equation 4

Max (Δr, Δg, Δb) indicates the maximum value among Δr, Δg, and Δb. Min (Δr, Δg, Δb) indicates the minimum value among Δr, Δg, and Δb. m is the number of the second pixels 13 (that is, the second pixels 13 constituting the measurement area 15) in the measurement area 15 (FIG. 10). m may be preset in the arithmetic processing unit 305, or may be set by the measurer by operating the PC 400 in the arithmetic processing unit 305. Here, the number m of the second pixel 13 constituting the measurement region 15 will be described by taking 9 as an example.

R_mes is the size of the red subpixels 11-r in the photometric region 33. R_ref is the size of the red subpixel 11-r included in one second pixel 13. G_mes is the size of the green subpixel 11-g in the photometric region 33. G_ref is the size of the green subpixel 11-g contained in one second pixel 13. B_mes is the size of the blue subpixels 11-b in the photometric region 33. B_ref is the size of the blue subpixel 11-b included in one second pixel 13.

14A and 14B are flowcharts illustrating a first aspect of the embodiment. With reference to FIGS. 7 and 8, in order to perform the processes of steps S1 to S6 of FIG. 14A, the measurer rotates the holder 302d and penetrates between the optical lens 301 and the two-dimensional image sensor 3. Position the mouth 302h. No filter is arranged at the through-hole portion 302h. The two-dimensional color measuring device 300 captures and stores an image of the DUT screen 1 (hereinafter referred to as a red image) in a state where red is displayed on the entire DUT screen 1 (step S1 in FIG. 14A). The details are as follows.

When displaying red (primary color) on the DUT screen 1, the DUT lights only the red subpixels 11-r. FIG. 15 is a plan view showing a state in which only the red subpixels 11-r are lit in FIG. With reference to FIGS. 7 and 15, in the two-dimensional image sensor 3, the entire DUT screen 1 is displayed in red (that is, all the red subpixels 11-r included in the DUT screen 1 are lit. The image (red image) of the DUT screen 1 is imaged with the remaining sub-pixels 11 not lit). As a result, the two-dimensional image sensor 3 outputs the red primary color image information signal SG. The output primary color image information signal SG is processed by the signal processing unit 303 and the A / D conversion unit 304, then sent to the arithmetic processing unit 305 and stored in the image storage unit 307. As a result, the red image is stored in the image storage unit 307.

With reference to FIG. 7, the two-dimensional color measuring device 300 calculates and stores the coordinates on the two-dimensional image sensor 3 for all the red subpixels 11-r included in the DUT screen 1 (FIG. 14A). Step S2). The details are as follows.

The coordinate calculation unit 309 reads out the red image stored in the image storage unit 307 in step S1, and uses this red image to generate a two-dimensional image sensor for all the red subpixels 11-r included in the DUT screen 1. 3 The above coordinates are calculated and stored in the coordinate storage unit 310. For example, the coordinates of the 25 red subpixels 11-r shown in FIG. 15 are as follows.
x-coordinates: (5.8-7.0), (14.8-16), (23.9-25.0), (32.9-34), (42-43.1)
y-coordinates: (4.1-6.0), (12.7-14.6), (20.3-22.2), (27.0-28.9), (35.4-37. 3)

The combination of the x-coordinate and the y-coordinate represents the coordinates of the red subpixel 11-r. FIG. 16 is an explanatory diagram illustrating the relationship between the red subpixels 11-r shown in FIG. 15, the x-coordinate, and the y-coordinate. For example, the upper left red subpixel 11-r in FIG. 15 is at a position defined by the x-coordinate (5.8 to 7.0) and the y-coordinate (4.1-6.0).

An example of a method of calculating the coordinates on the two-dimensional image sensor 3 will be described. FIG. 17 is an explanatory diagram illustrating a method of calculating the x-coordinate on the two-dimensional image sensor 3 for the red subpixel 11-r. The first to 14th first pixels 31 are arranged in the x direction. In the x direction, the green subpixel 11-g, the blue subpixel 11-b, the red subpixel 11-r, and the green subpixel 11-g are arranged in this order as shown in FIG. The waveform of the signal SG shows the waveform of the primary color image information signal SG output from the two-dimensional image sensor 3 with only the red subpixels 11-r lit.

Red light is incident on a part of the eighth first pixel 31, red light is incident on the entire ninth first pixel 31, and red light is incident on a part of the tenth first pixel 31. As a result, the intensity of the primary color image information signal SG output from the 8th first pixel 31 is 40% of the intensity of the primary color image information signal SG output from the 9th first pixel 31, and the 10th. The intensity of the primary color image information signal SG output from the first pixel 31 of the above is 70% of the intensity of the primary color image information signal SG output from the ninth first pixel 31. In this case, the x-coordinate of the red subpixel 11-r is (8.4 to 10.7). The y-coordinate of the red subpixel 11-r can be obtained by the same method. The xy coordinates of the green subpixel 11-g and the xy coordinates of the blue subpixel 11-b can also be obtained by the same method.

As described above, the two-dimensional image sensor 3 performs the second process of imaging the DUT screen 1 on which the primary color image is displayed by using the sub-pixels 11 of one color, and the sub-pixels 11 (red sub-pixels 11) of a plurality of colors. Execute for each of pixel 11-r, green subpixel 11-g, and blue subpixel 11-b). The coordinate calculation unit 309 describes the subpixel 11 used for displaying the primary color image based on the waveform of the primary color image information signal SG output by the two-dimensional image sensor 3 when the two-dimensional image sensor 3 captures the primary color image. , The third process of calculating the coordinates on the two-dimensional image sensor 3 is executed for each of the subpixels 11 of the plurality of colors. The cases of green and blue will be described below.

With reference to FIG. 7, the two-dimensional color measuring device 300 captures and stores an image of the DUT screen 1 (hereinafter referred to as a green image) in a state where green is displayed on the entire DUT screen 1 (FIG. 14A). Step S3). The details are as follows.

When displaying green (primary color) on the DUT screen 1, the DUT lights only the green subpixel 11-g. FIG. 18 is a plan view showing a state in which only the green subpixels 11-g are lit in FIG. With reference to FIGS. 7 and 18, the two-dimensional image sensor 3 is in a state where the entire DUT screen 1 is displayed in green (that is, all the green subpixels 11-g included in the DUT screen 1 are lit. The image (green image) of the DUT screen 1 is imaged with the remaining sub-pixels 11 not lit). As a result, the two-dimensional image sensor 3 outputs the green primary color image information signal SG. The output primary color image information signal SG is processed by the signal processing unit 303 and the A / D conversion unit 304, then sent to the arithmetic processing unit 305 and stored in the image storage unit 307. As a result, the green image is stored in the image storage unit 307.

With reference to FIG. 7, the two-dimensional color measuring device 300 calculates and stores the coordinates on the two-dimensional image sensor 3 for all the green subpixels 11-g included in the DUT screen 1 (FIG. 14A). Step S4). The details are as follows.

The coordinate calculation unit 309 reads out the green image stored in the image storage unit 307 in step S3, and uses this green image to generate a two-dimensional image sensor for all the green subpixels 11-g included in the DUT screen 1. 3 The above coordinates are calculated and stored in the coordinate storage unit 310. For example, the coordinates of the 25 green subpixels 11-g shown in FIG. 18 are as follows.
x-coordinates: (10.4 to 14.0), (19.4 to 23.0), (28.4 to 32.0), (37.4 to 41.0), (46.4 to 50. 0)
y-coordinates: (4.1-6.0), (12.7-14.6), (20.3-22.2), (27.0-28.9), (35.4-37. 3)

The combination of the x-coordinate and the y-coordinate represents the coordinates of the green subpixel 11-g. FIG. 19 is an explanatory diagram illustrating the relationship between the green subpixel 11-g shown in FIG. 18, the x-coordinate, and the y-coordinate. For example, the green sub-pixel 11-g at the upper left of FIG. 18 is at a position defined by the x-coordinate (10.4 to 14.0) and the y-coordinate (4.1 to 6.0). The method of calculating the coordinates is the same as the method of calculating the coordinates of the red subpixel 11-r.

With reference to FIG. 7, the two-dimensional color measuring device 300 captures and stores an image of the DUT screen 1 (hereinafter referred to as a blue image) in a state where blue is displayed on the entire DUT screen 1 (FIG. 14A). Step S5). The details are as follows.

When displaying blue (primary color) on the DUT screen 1, the DUT lights only the blue subpixels 11-b. FIG. 20 is a plan view showing a state in which only the blue subpixels 11-b are lit in FIG. With reference to FIGS. 7 and 20, in the two-dimensional image sensor 3, the entire DUT screen 1 is displayed in blue (that is, all the blue subpixels 11-b included in the DUT screen 1 are lit. The image (blue image) of the DUT screen 1 is imaged with the remaining sub-pixels 11 not lit). As a result, the two-dimensional image sensor 3 outputs the blue primary color image information signal SG. The output primary color image information signal SG is processed by the signal processing unit 303 and the A / D conversion unit 304, then sent to the arithmetic processing unit 305 and stored in the image storage unit 307. As a result, the blue image is stored in the image storage unit 307.

With reference to FIG. 7, the two-dimensional color measuring device 300 calculates and stores the coordinates on the two-dimensional image sensor 3 for all the blue subpixels 11-b included in the DUT screen 1 (FIG. 14A). Step S6). The details are as follows.

The coordinate calculation unit 309 reads out the blue image stored in the image storage unit 307 in step S5, and uses this blue image to generate a two-dimensional image pickup element for all the blue subpixels 11-b included in the DUT screen 1. The coordinates on 3 are calculated and stored in the coordinate storage unit 310. For example, the coordinates of the 25 blue subpixels 11-b shown in FIG. 20 are as follows.
(A) x coordinate: (6.1 to 12.8), (17.1 to 23.8), (23.9 to 30.6), (34.1 to 40.8), (40.9) ~ 47.6)
(B) y coordinate: (8.4 to 10.3), (23.6 to 25.5), (39.0 to 40.9)
(C) x coordinate: (8.1-14.8), (14.9-21.6), (26.2-32.9), (33.0-39.7), (43.2) ~ 49.9)
(D) y coordinate: (16.1 to 18.0), (31.2 to 33.1)

The combination of the x-coordinate shown in (a) and the y-coordinate shown in (b) represents the coordinates of the blue subpixel 11-b, and the combination of the x-coordinate shown in (c) and the y-coordinate shown in (d). Represents the coordinates of the blue subpixels 11-b. FIG. 21 is an explanatory diagram illustrating the relationship between the blue subpixels 11-b shown in FIG. 20, the x-coordinate, and the y-coordinate. For example, the upper left blue subpixel 11-b in FIG. 20 is at a position defined by the x-coordinate (6.1 to 12.8) and the y-coordinate (8.4 to 10.3). The method of calculating the coordinates is the same as the method of calculating the coordinates of the red subpixel 11-r.

With reference to FIG. 7, the measurer operates the PC 400 (an example of the input unit) to input the upper limit value of the measurement variation Δ% into the two-dimensional color measuring device 300 (step S7 in FIG. 14A). As a result, the arithmetic processing unit 305 sets the upper limit value of the measurement variation Δ% in the adjusting unit 308. The two-dimensional color measuring device 300 adjusts the light measuring area 33 so that the value of the measurement variation Δ% falls within the range of 0% to this upper limit value (an example of a predetermined range). If the upper limit of the measurement variation Δ% is preset in the adjusting unit 308, this input is unnecessary.

The measurer operates the PC 400 to set a plurality of measurement areas 15 (FIG. 6) on the DUT screen 1. The adjusting unit 308 calculates the target coordinates for each of the plurality of measurement regions 15 (step S8 in FIG. 14B). Here, of the plurality of measurement areas 15, the measurement area 15 composed of nine second pixels 13 centered on the second pixel 13 at the coordinates (3, 3) shown in FIG. 13 will be described as an example. .. The target coordinates for the measurement region 15 are (28.4, 24.0) as described above.

The adjusting unit 308 is used for the metering region 33 of the red subpixel 11-r, that is, the metering region 33 including the target coordinates (step S9 in FIG. 14B). This is set based on the target coordinates, the number of the second pixels 13 constituting the measurement area 15 (here, 9), and the coordinates of the red subpixel 11-r (step S2 in FIG. 14A). Will be done. Here, for example, as shown in FIG. 15, the photometric region 33-r defined by the coordinates (15,13), the coordinates (34,13), the coordinates (15,29), and the coordinates (34,29) is set. Suppose it was done.

The adjusting unit 308 is used for measuring the green sub-pixel 11-g, that is, the green sub-pixel 11-g, and sets the light measuring area 33 including the target coordinates (step S10 in FIG. 14B). This is set based on the target coordinates, the number of the second pixels 13 constituting the measurement area 15 (here, 9), and the coordinates of the green subpixel 11-g (step S4 in FIG. 14A). Will be done. Here, for example, as shown in FIG. 18, the photometric region 33-g defined by the coordinates (19,13), the coordinates (41,13), the coordinates (19,29), and the coordinates (41,29) is set. Suppose it was done.

The adjusting unit 308 is used for the metering region 33 of the blue subpixel 11-b, that is, the metering region 33 including the target coordinates (step S11 in FIG. 14B). This is set based on the target coordinates, the number of the second pixels 13 constituting the measurement area 15 (here, 9), and the coordinates of the blue subpixels 11-b (step S6 in FIG. 14A). Will be done. Here, for example, as shown in FIG. 20, the photometric region 33-b defined by the coordinates (15,16), the coordinates (41,16), the coordinates (15,33), and the coordinates (41,33) is set. Suppose it was done.

The adjusting unit 308 calculates Δr (step S12 in FIG. 14B). As described above, Δr is represented by Equation 2. R_ref is the size of the red subpixel 11-r included in one second pixel 13. R_ref can be obtained based on the coordinates of the red subpixels 11-r stored in the coordinate storage unit 310. The adjusting unit 308 obtains R_ref by paying attention to the red subpixel 11-r located at the center of the red subpixels 11-r in FIG. 16, for example. R_ref is 2.09 (= (25.0-23.9) × (22.2-20.3)).

R_mes is the total size of the red subpixels 11-r located in the photometric region 33 (photometric region 33-r shown in FIG. 15) set in step S9. How to obtain R_mes will be described. Regarding the red subpixels 11-r included in the second pixel 13 of the coordinates (2, 2) on the DUT screen 1, the size r1 in the photometric region 33 is as follows.
r1 = (16-15) x (14.6-13) = 1.6

Regarding the red subpixels 11-r included in the second pixel 13 of the coordinates (3, 2) on the DUT screen 1, the size r2 in the photometric region 33 is as follows.
r2 = (25-23.9) x (14.6-13) = 1.76

Regarding the red subpixels 11-r included in the second pixel 13 of the coordinates (4, 2) on the DUT screen 1, the size r3 in the photometric area 33 is as follows.
r3 = (34-32.9) x (14.6-13) = 1.76

Regarding the red subpixels 11-r included in the second pixel 13 of the coordinates (2, 3) on the DUT screen 1, the size r4 in the photometric area 33 is as follows.
r4 = (16-15) x (22.2-20.3) = 1.9

Regarding the red subpixels 11-r included in the second pixel 13 of the coordinates (3, 3) on the DUT screen 1, the size r5 in the photometric region 33 is as follows.
r5 = (25-23.9) x (22.2-20.3) = 2.09

Regarding the red subpixels 11-r included in the second pixel 13 of the coordinates (4, 3) on the DUT screen 1, the size r6 in the photometric area 33 is as follows.
r6 = (34-32.9) x (22.2-20.3) = 2.09

Regarding the red subpixels 11-r included in the second pixel 13 of the coordinates (2, 4) on the DUT screen 1, the size r7 in the photometric area 33 is as follows.
r7 = (16-15) x (28.9-27) = 1.9

Regarding the red subpixels 11-r included in the second pixel 13 of the coordinates (3, 4) on the DUT screen 1, the size r8 in the photometric region 33 is as follows.
r8 = (25-23.9) x (28.9-27) = 2.09

Regarding the red subpixels 11-r included in the second pixel 13 of the coordinates (4, 4) on the DUT screen 1, the size r9 in the photometric region 33 is as follows.
r9 = (34-32.9) x (28.9-27) = 2.09

R_mes is 17.28 (= r1 + r2 + r3 + r4 + r5 + r6 + r7 + r8 + r9).

Therefore, Δr is 0.9186 (= 17.28 ÷ (2.09 × 9)).

The adjusting unit 308 calculates Δg (step S13 in FIG. 14B). As described above, Δg is represented by Equation 3. G_ref is the size of the green subpixel 11-g contained in one second pixel 13. G_ref can be obtained based on the coordinates of the green subpixels 11-g stored in the coordinate storage unit 310. The adjusting unit 308 obtains G_ref by paying attention to the green subpixel 11-g located at the center among the green subpixels 11-g in FIG. 19, for example. G_ref is 6.84 (= (32.0-28.4) × (22.2-20.3)).

G_mes is the total size of the green subpixels 11-g located in the photometric region 33 (photometric region 33-g shown in FIG. 18) set in step S10. How to obtain G_mes will be described. Regarding the green sub-pixels 11-g included in the second pixel 13 of the coordinates (2, 2) on the DUT screen 1, the size g1 in the photometric area 33 is as follows.
g1 = (23-19.4) x (14.6-13) = 5.76

Regarding the green sub-pixel 11-g included in the second pixel 13 of the coordinates (3, 2) on the DUT screen 1, the size g2 in the photometric area 33 is as follows.
g2 = (32-28.4) x (14.6-18) = 5.76

Regarding the green sub-pixels 11-g included in the second pixel 13 of the coordinates (4, 2) on the DUT screen 1, the size g3 in the photometric region 33 is as follows.
g3 = (41-37.4) x (14.6-18) = 5.76

Regarding the green sub-pixels 11-g included in the second pixel 13 of the coordinates (2, 3) on the DUT screen 1, the size g4 in the photometric area 33 is as follows.
g4 = (23-19.4) x (22.2-20.3) = 6.84

Regarding the green sub-pixels 11-g included in the second pixel 13 of the coordinates (3, 3) on the DUT screen 1, the size g5 in the photometric area 33 is as follows.
g5 = (32-28.4) x (22.2-20.3) = 6.84

Regarding the green sub-pixels 11-g included in the second pixel 13 of the coordinates (4, 3) on the DUT screen 1, the size g6 in the photometric area 33 is as follows.
g6 = (41-37.4) x (22.2-20.3) = 6.84

Regarding the green sub-pixels 11-g included in the second pixel 13 of the coordinates (2, 4) on the DUT screen 1, the size g7 in the photometric area 33 is as follows.
g7 = (23-19.4) x (28.9-27) = 6.84

Regarding the green sub-pixels 11-g included in the second pixel 13 of the coordinates (3, 4) on the DUT screen 1, the size g8 in the photometric area 33 is as follows.
g8 = (32-28.4) x (28.9-27) = 6.84

Regarding the green sub-pixels 11-g included in the second pixel 13 of the coordinates (4, 4) on the DUT screen 1, the size g9 in the photometric area 33 is as follows.
g9 = (41-37.4) x (28.9-27) = 6.84

G_mes is 58.32 (= g1 + g2 + g3 + g4 + g5 + g6 + g7 + g8 + g9).

Therefore, Δg is 0.947 (= 58.32 ÷ (6.84 × 9)).

The adjusting unit 308 calculates Δb (step S14 in FIG. 14B). As described above, Δb is represented by Equation 4. B_ref is the size of the blue subpixel 11-b included in one second pixel 13. B_ref can be obtained based on the coordinates of the blue subpixels 11-b stored in the coordinate storage unit 310. The adjusting unit 308 obtains B_ref by paying attention to the blue subpixel 11-b located at the center of the blue subpixels 11-b in FIG. 21, for example. B_ref is 12.73 (= (30.6-23.9) × (25.5-23.6)).

B_mes is the total size of the blue subpixels 11-b located in the photometric region 33 (photometric region 33-b shown in FIG. 20) set in step S11. How to obtain B_mes will be described. Regarding the blue subpixel 11-b included in the second pixel 13 of the coordinates (2, 2) on the DUT screen 1, the size b1 in the photometric area 33 is as follows.
b1 = (21.6-15) x (17-16.1) = 12.54

Regarding the blue subpixels 11-b included in the second pixel 13 of the coordinates (3, 2) on the DUT screen 1, the size b2 in the photometric area 33 is as follows.
b2 = (32.9-26.2) x (17-16.1) = 12.73

Regarding the blue subpixels 11-b included in the second pixel 13 of the coordinates (4, 2) on the DUT screen 1, the size b3 in the photometric area 33 is as follows.
b3 = (39.7-33) x (17-16.1) = 12.73

Regarding the blue subpixels 11-b included in the second pixel 13 of the coordinates (2, 3) on the DUT screen 1, the size b4 in the photometric area 33 is as follows.
b4 = (23.8-17.1) x (25.5-23.6) = 12.73

Regarding the blue subpixels 11-b included in the second pixel 13 of the coordinates (3, 3) on the DUT screen 1, the size b5 in the photometric area 33 is as follows.
b5 = (30.6-23.9) x (25.5-23.6) = 12.73

Regarding the blue subpixels 11-b included in the second pixel 13 of the coordinates (4, 3) on the DUT screen 1, the size b6 in the photometric area 33 is as follows.
b6 = (41-34.1) x (25.5-23.6) = 13.11

Regarding the blue subpixels 11-b included in the second pixel 13 of the coordinates (2, 4) on the DUT screen 1, the size b7 in the photometric area 33 is as follows.
b7 = (21.6-15) x (33-31.2) = 11.88

Regarding the blue subpixels 11-b included in the second pixel 13 of the coordinates (3, 4) on the DUT screen 1, the size b8 in the photometric area 33 is as follows.
b8 = (32.9-26.2) x (33-31.2) = 12.06

Regarding the blue subpixels 11-b included in the second pixel 13 of the coordinates (4, 4) on the DUT screen 1, the size b9 in the photometric area 33 is as follows.
b9 = (39.7-33) x (33-31.2) = 12.06

B_mes is 112.57 (= b1 + b2 + b3 + b4 + b5 + b6 + b7 + b8 + b9).

Therefore, Δb is 0.9825 (= 112.57 ÷ (12.73 × 9)).

The adjusting unit 308 calculates the measurement variation Δ% using Δr, Δg, Δb and Equation 1 (step S15 in FIG. 14B). The adjusting unit 308 determines whether or not the calculated measurement variation Δ% is equal to or less than the upper limit value input in step S7 (step S16 in FIG. 14B). When the adjusting unit 308 determines that the calculated measurement variation Δ% is equal to or less than the upper limit value input in step S7 (Yes in step S16), the metering region 33 of the red subpixel 11-r is set in step S9. The area 33 is determined, the measurement area 33 of the green subpixel 11-g is determined to be the measurement area 33 set in step S10, and the measurement area 33 of the blue subpixel 11-b is determined to be the measurement area 33 set in step S11. (Step S17 in FIG. 14B).

When the adjusting unit 308 determines that the calculated measurement variation Δ% exceeds the upper limit value input in step S7 (No in step S16), the adjusting unit 308 determines that the measurement area 33 of each subpixel 11 The size or position of the above is changed (steps S9 to S11 in FIG. 14B), and the adjusting unit 308 performs the processes of steps S12 to S16. The adjusting unit 308 repeats steps S9 to S16 until the measurement variation Δ% becomes equal to or less than the upper limit value. In this way, the adjusting unit 308 changes the size or position of the photometric region 33 and finds the photometric region 33 in which the measurement variation Δ% is within a predetermined range.

After step S17, the measurer measures the color of the DUT screen 1 using the two-dimensional color measuring device 300. This is the same as normal color measurement. The first calculation unit 311 is based on the photometric amount of the measurement area 15 corresponding to the photometric area 33 adjusted by the adjustment unit 308 in the first process (steps S9 to S17), and the color measurement value of the measurement area 15 is measured. The fourth process of calculating the above is executed for each of the plurality of measurement areas 15. The second calculation unit 312 performs a plurality of fifth processes for calculating the brightness value of the measurement area 15 based on the photometric amount of the measurement area 15 corresponding to the photometric area 33 adjusted by the adjustment unit 308 in the first process. This is performed for each of the measurement regions 15 of. Specifically, it is as follows.

With reference to FIGS. 7 and 8, the two-dimensional color measuring device 300 captures a white image displayed on the DUT screen 1 with the X filter 302a and the two-dimensional image sensor 3 facing each other, and this white image. Based on the above, the metering amount is calculated for each of the plurality of measurement areas 15. Similarly, the two-dimensional color measuring device 300 captures a white image displayed on the DUT screen 1 with the Y filter 302b and the two-dimensional image sensor 3 facing each other, and based on the white image, a plurality of white images are captured. The photometric amount is calculated for each of the measurement areas 15. The two-dimensional color measuring device 300 captures a white image displayed on the DUT screen 1 with the Z filter 302c and the two-dimensional image sensor 3 facing each other, and based on this white image, a plurality of measurement regions 15 Calculate the metering amount for each of. The first calculation unit 311 calculates the chromaticity (color measurement value) for each of the plurality of measurement areas 15 based on these photometric quantities. The second calculation unit 312 calculates the luminance value (color measurement value) for each of the plurality of measurement areas 15 based on these photometric quantities.

In the first aspect of the embodiment, the case where the number of red subpixels 11-r, the number of green subpixels 11-g, and the number of blue subpixels 11-b contained in one second pixel 13 are the same has been described. (Each one). For example, as shown in FIG. 9B, the number of red subpixels 11-r, the number of green subpixels 11-g, and the number of blue subpixels 11-b contained in one second pixel 13 may not be the same. be. The calculation method of Δr, Δg, and Δb differs depending on whether they are the same or not (for example, in the case of Δg, m is 18, and in the case of Δr, Δb, m is 9). Therefore, the measurer operates the PC 400 to calculate the number of red sub-pixels 11-r, the number of green sub-pixels 11-g, and the number of blue sub-pixels 11-b contained in one second pixel 13. It can be set in advance in the unit 305. Alternatively, the two-dimensional color measuring device 300 calculates and calculates the number of red subpixels 11-r, the number of green subpixels 11-g, and the number of blue subpixels 11-b contained in one second pixel 13. The calculated number can be set in advance in the arithmetic processing unit 305. These things are the same in the second aspect described below.

In the first aspect of the embodiment described above, since the coordinates of the photometric region 33 are determined by the unit of the first pixel 31 constituting the two-dimensional image pickup element 3, the red subpixel 11- in the photometric region 33-r The number of r, the number of green subpixels 11-g in the photometric area 33-g, and the number of blue subpixels 11-b in the photometric area 33-b are not necessarily integers. In the second aspect of the embodiment described below, the coordinates of the photometric region 33 are determined so that the number of these subpixels 11 is an integer. In the second aspect of the embodiment, the ratio of the number of red subpixels 11-r, the number of green subpixels 11-g, and the number of blue subpixels 11-b contained in the photometric region 33 is the second pixel 13. The photometric region 33 is adjusted so as to be the same as the ratio of the number of red subpixels 11-r, the number of green subpixels 11-g, and the number of blue subpixels 11-b. This means that the measurement variation Δ% of the chromaticity is set to 0%, as will be described later.

FIG. 22 is a flowchart illustrating a second aspect of the embodiment. Steps S1 to S8 are the same as steps S1 to S8 shown in FIGS. 14A and 14B.

The adjusting unit 308 sets a photometric region 33 in which the number of red subpixels 11-r is an integer m based on the coordinates of the red subpixels 11-r stored in the coordinate storage unit 310 (FIG. 22). Step S21). As described above, the integer m is the number of the second pixels 13 in the measurement area 15, and the integer m is 9. Here, as shown in FIG. 16, a photometric region 33 having an x-coordinate of (14.8 to 34.0) and a y-coordinate of (12.7 to 28.9) is set.

The adjusting unit 308 sets the photometric region 33 in which the number of the green subpixels 11-g is an integer m based on the coordinates of the green subpixels 11-g stored in the coordinate storage unit 310 (FIG. 22). Step S22). Here, as shown in FIG. 19, a photometric region 33 having an x-coordinate of (19.4 to 41.0) and a y-coordinate of (12.7 to 28.9) is set.

The adjusting unit 308 sets the photometric region 33 in which the number of the blue subpixels 11-g is an integer m based on the coordinates of the blue subpixels 11-b stored in the coordinate storage unit 310 (FIG. 22). Step S23). Here, as shown in FIG. 21, a photometric region 33 having an x-coordinate of (14.9 to 40.8) and a y-coordinate of (16.1 to 3.1) is set.

Incidentally, when the measurement variation Δ% is obtained for the photometric region 33 set in steps S21 to S23, it becomes 0% as shown below. The number of red subpixels 11-r included in the photometric region 33 set in step S21 is nine. R_mes is equal to 9 × R_ref. Therefore, Δr becomes 1. The number of green subpixels 11-g included in the photometric region 33 set in step S22 is nine. G_mes is equal to 9 × G_ref. Therefore, Δg becomes 1. The number of blue subpixels 11-b included in the photometric area 33 set in step S23 is nine. B_mes is equal to 9 × B_ref. Therefore, Δb becomes 1. Therefore, the measurement variation Δ% is 0%.

In the first aspect and the second aspect of the embodiment, as the measurement variation, the measurement variation Δ% obtained based on the size of the subpixel 11 in the photometric region 33 is used. In the third aspect of the embodiment described below, the measurement variation Δ obtained based on the chromaticity error is used as the measurement variation. The measurement variation Δ used in the third aspect of the embodiment is represented by the following formula 5. This Δ is the second example of the definition of the measurement variation of chromaticity.
Δ = Max (| Δx |, | Δy |) ... Equation 5

Max (| Δx |, | Δy |) indicates the larger of | Δx | and | Δy |. Δx and Δy are represented by the following equations.
Δx = x_cal-x_true ... Equation 6
Δy = y_cal-y_true ... Equation 7

x_true and y_true are true chromaticity xy calculated using the magnified measurement region corresponding to the magnified photometric region. The magnified photometric region has a larger size than the initial photometric region 33 (the photometric region 33 before adjustment set in correspondence with the measurement region 15) so that the measurement variation of the chromaticity does not occur. As described with reference to FIG. 27, as the size of the photometric region 33 becomes wider, the measurement variation of the chromaticity becomes smaller. When the size of the photometric region 33 becomes large to some extent (for example, the photometric region 33 corresponding to the measurement region 15 composed of 300 × 300 second pixels 13 or the measurement composed of all the second pixels 13). There is no measurement variation in chromaticity in the photometric area 33) corresponding to the area 15.

The magnified measurement area corresponds to the magnified photometric area. For example, as described above, the magnified measurement area is composed of 300 × 300 second pixels 13, or all the second pixels 13. This is the measurement area. In the latter case, the entire DUT screen 1 is the measurement area.

x_cal and y_cal are chromaticity xy calculated using the photometric area 33 corresponding to the measurement area 15 (FIG. 6).

FIG. 23 is a flowchart illustrating a third aspect of the embodiment. Steps S1 to S7 are the same as steps S1 to S7 shown in FIG. 14A. With reference to FIG. 7, the two-dimensional color measuring device 300 calculates and stores x_true and y_true (step S31 in FIG. 23). The details are as follows.

The definition of each of the three stimulus values is shown.
X_r: 3 stimulus values of X when displayed in red X_g: 3 stimulus values of X when displayed in green X_b: 3 stimulus values of X when displayed in blue Y_r: 3 stimulus values of Y when displayed in red Y_g: 3 stimulus values of Y when displayed in green 3 stimulus values of Y Y_b: 3 stimulus values of Y when displayed in blue Z_r: 3 stimulus values of Z when displayed in red Z_g: 3 stimulus values of Z when displayed in green Z_b: 3 stimulus values of Z when displayed in blue

The measurer operates the PC 400 and inputs the coordinates of the enlarged measurement area on the DUT screen 1. As a result, the arithmetic processing unit 305 sets the magnifying metering area corresponding to this magnifying measurement area.

With reference to FIGS. 7 and 8, the two-dimensional color measuring device 300 has a red image, a green image, and a blue image sequentially displayed on the DUT screen 1 in a state where the X filter 302a and the two-dimensional image sensor 3 face each other. , And based on these images, X_r, X_g, and X_b of the magnified measurement region corresponding to the magnified metering region are calculated. Similarly, the two-dimensional color measuring device 300 captures a red image, a green image, and a blue image sequentially displayed on the DUT screen 1 in a state where the Y filter 302b and the two-dimensional image sensor 3 face each other, and these Based on the image, Y_r, Y_g, and Y_b of the magnified measurement region corresponding to the magnified metering region are calculated. The two-dimensional color measuring device 300 captures a red image, a green image, and a blue image sequentially displayed on the DUT screen 1 in a state where the Z filter 302c and the two-dimensional image sensor 3 face each other, and based on these images. Then, Z_r, Z_g, and Z_b of the magnified measurement area corresponding to the magnified metering area are calculated.

The first calculation unit 311 calculates x_true and y_true using X_r, X_g, X_b, Y_r, Y_g, Y_b, Z_r, Z_g, Z_b, and the following equations in the enlarged measurement region.
x_true = X_t / (X_t + Y_t + Z_t) ... Equation 8
y_true = Y_t / (X_t + Y_t + Z_t) ... Equation 9

Here, X_t, Y_t, and Z_t are represented by the following equations.
X_t = X_r + X_g + X_b ... Equation 10
Y_t = Y_r + Y_g + Y_b ... Equation 11
Z_t = Z_r + Z_g + Z_b ... Equation 12

The first calculation unit 311 stores the calculated x_true and y_true in the adjustment unit 308.

After step S31, steps S8 to S11 are executed. These are the same as steps S8 to S11 in FIG. 14B. Next, the two-dimensional color measuring device 300 calculates and stores x_cal and y_cal (step S32 in FIG. 23). The details are as follows.

The first calculation unit 311 uses the red image used for calculating X_r, Y_r, and Z_r in step S31 to obtain X_r, Y_r, and Z_r of the measurement area 15 corresponding to the photometric area 33 set in step S9. calculate. Similarly, the first calculation unit 311 uses the green image used to calculate X_g, Y_g, Z_g in step S31, and X_g, Y_g of the measurement area 15 corresponding to the photometric area 33 set in step S10. , Z_g is calculated. The first calculation unit 311 uses the blue image used for calculating X_b, Y_b, and Z_b in step S31 to obtain X_b, Y_b, and Z_b of the measurement area 15 corresponding to the photometric area 33 set in step S11. calculate.

The first calculation unit 311 calculates the number N_r of the red subpixels 11-r in the photometric region 33 set in step S9 by using the coordinates of the red subpixels 11-r stored in step S2. The first calculation unit 311 calculates the number N_g of the green subpixels 11-g in the photometric area 33 set in step S10 by using the coordinates of the green subpixels 11-g stored in step S4. The first calculation unit 311 calculates the number N_b of the blue subpixels 11-b in the photometric region 33 set in step S11 by using the coordinates of the blue subpixels 11-b stored in step S6.

The first calculation unit 311 includes X_r, X_g, X_b, Y_r, Y_g, Y_b, Z_r, Z_g, Z_b of the measurement area 15, the number of subpixels 11 in the photometric area 33 N_r, N_g, N_b, and the following equations. Is used to calculate x_cal and y_cal.
x_cal = X_c / (X_c + Y_c + Z_c) ... Equation 13
y_cal = Y_c / (X_c + Y_c + Z_c) ... Equation 14

Here, X_c, Y_c, and Z_c are represented by the following equations.
X_c = (N_r × X_r) + (N_g × X_g) + (N_b × X_b) ・ ・ ・ Equation 15
Y_c = (N_r × Y_r) + (N_g × Y_g) + (N_b × X_b) ・ ・ ・ Equation 16
Z_c = (N_r × Z_r) + (N_g × Z_g) + (N_b × X_b) ・ ・ ・ Equation 17

The first calculation unit 311 stores the calculated x_cal and y_cal in the adjustment unit 308.

The adjusting unit 308 calculates the measurement variation Δ using the x_true and y_true stored in step S31, the x_cal and y_cal stored in step S32, and the equations 5, 6 and 7 (step S33).

After step S33, steps S16 and S17 are executed. These are similar to steps S16 and S17 shown in FIG. 14B.

In the first to third aspects of the embodiment, the adjusting unit 308 sets a plurality of photometric regions 33 corresponding to the plurality of measurement regions 15, and measures variations in the photometric amount of the photometric regions 15 corresponding to the photometric regions 33. The first process (steps S09 to S17 in FIG. 14B, steps S21 to S23 in FIG. 22, steps S9 to S11 in FIG. 23, steps S32, and steps) for adjusting the photometric region 33 so that S33, step S16, and step S17) are executed for each of the plurality of photometric regions 33. Therefore, in the two-dimensional color measuring device 300 according to the embodiment, it is not necessary to set a relatively large photometric area 33 in the two-dimensional color measuring device 300 in advance in order to eliminate the measurement variation. Therefore, the measurement accuracy of the photometric quantity can be improved without making the photometric region 33 excessively large.

The sub-pixel 11 constituting the second pixel 13 has been described by taking three examples: a red sub-pixel 11-r, a green sub-pixel 11-g, and a blue sub-pixel 11-b, but the present invention is not limited thereto. For example, the embodiment can be applied to the case where the sub-pixel 11 constituting the second pixel 13 is a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel. The embodiment can also be applied to the four cases of sub-pixel, blue sub-pixel, and yellow sub-pixel.

1 DUT screen (an example of a color display screen)
11 Subpixel 11-r Red subpixel 11-g Green subpixel 11-b Blue subpixel 13 Second pixel 15 Measurement area 3 Two-dimensional image sensor 31 First pixel 33, 33-r, 33-g, 33-b Measuring area 310 Two-dimensional image sensor 300 Two-dimensional color measuring device

Claims (10)

A two-dimensional color measuring device that is arranged in two dimensions and measures a plurality of measurement areas in the color display screen of a color display screen having a second pixel including a red subpixel, a green subpixel, and a blue subpixel. And
A two-dimensional imaging unit that has a first pixel arranged in two dimensions and captures an image of the color display screen on which a predetermined color is displayed.
A plurality of photometric regions including two or more of the first pixels are set corresponding to the plurality of measurement regions, and a photometric quantity generated by a difference in the number of sub-pixels of each color in the measurement region corresponding to the photometric region. The first process for adjusting the photometric region is provided for each of the plurality of photometric regions so that the measurement variation of the above is within a predetermined range.
In the adjusting unit, Max (Δr, Δg, Δb) indicates the maximum value among Δr, Δg, and Δb, Min (Δr, Δg, Δb) indicates the minimum value among Δr, Δg, and Δb, and m. Is the number of second pixels in the measurement area, R_mes is the size of the red subpixels in the light measurement area, R_ref is the size of the red subpixels included in one second pixel, and G_mes. Is the size of the green subpixel in the photometric area, G_ref is the size of the green subpixel included in one second pixel, and B_mes is the size of the blue subpixel in the photometric area. When B_ref is the size of the blue sub-pixel included in one second pixel, the measurement variation Δ% is determined.
Δ% = {Max (Δr, Δg, Δb) -Min (Δr, Δg, Δb)} ÷ Max (Δr, Δg, Δb),
Δr = R_mes ÷ (m × R_ref),
Δg = G_mes ÷ (m × G_ref),
Δb = B_mes ÷ (m × B_ref)
A two-dimensional colorimeter that calculates using. A coordinate calculation unit for calculating the coordinates on the two-dimensional imaging unit is further provided for each of the sub-pixels of each color.
The photometric region is represented using the coordinates on the two-dimensional imaging unit.
The two-dimensional color measuring device according to claim 1, wherein the adjusting unit calculates the size of each of the sub-pixels of each color in the photometric region using the coordinates. The two-dimensional color measuring device according to claim 2, wherein the adjusting unit adjusts the light measuring region by using the coordinates. The two-dimensional image pickup unit executes a second process of imaging the color display screen on which the primary color image is displayed using the subpixels of one color for each of the subpixels of each color.
The coordinate calculation unit refers to the subpixels used for displaying the primary color image based on the waveform of the primary color image information signal output by the two-dimensional image pickup unit when the two-dimensional image pickup unit captures the primary color image. The two-dimensional color measuring device according to claim 2 or 3, wherein the third process of calculating the coordinates on the two-dimensional imaging unit is executed for each of the subpixels of each color. A two-dimensional color measuring device that is arranged in two dimensions and measures a plurality of measurement areas in the color display screen of a color display screen having a second pixel including a red subpixel, a green subpixel, and a blue subpixel. And
A two-dimensional imaging unit that has a first pixel arranged in two dimensions and captures an image of the color display screen on which a predetermined color is displayed.
A plurality of photometric regions including two or more of the first pixels are set corresponding to the plurality of measurement regions, and a photometric quantity generated by a difference in the number of sub-pixels of each color in the measurement region corresponding to the photometric region. The first process for adjusting the photometric region is provided for each of the plurality of photometric regions so that the measurement variation of the above is within a predetermined range.
The adjusting unit uses the photometric amount of the measurement area corresponding to the photometric area and the photometric amount of the magnified measurement area corresponding to the magnified photometric area having a larger size than the photometric area to measure the measurement variation. A two-dimensional colorimeter to calculate. The two-dimensional color measuring device according to claim 1, claim 2, claim 4, and claim 5, further comprising an input unit into which the predetermined range is input. .. The fourth process of calculating the color measurement value of the measurement area based on the photometric amount of the measurement area corresponding to the photometric area adjusted by the adjustment unit by the first process is performed on the plurality of measurement areas. The two-dimensional color measuring device according to any one of claims 1 to 6, further comprising a first calculation unit that executes for each. Each of the plurality of measurement regions is subjected to a fifth process of calculating the brightness value of the measurement region based on the photometric amount of the measurement region corresponding to the photometric region adjusted by the adjustment unit by the first processing. The two-dimensional color measuring device according to any one of claims 1 to 7, further comprising a second calculation unit for executing the above. A two-dimensional color measuring method for measuring a plurality of measurement areas in a color display screen by using a two-dimensional color measuring device including a two-dimensional imaging unit having a first pixel arranged in two dimensions.
The color display screen is arranged two-dimensionally and has a second pixel including a red subpixel, a green subpixel, and a blue subpixel.
A plurality of photometric regions including two or more of the first pixels are set corresponding to the plurality of measurement regions, and a photometric quantity generated by a difference in the number of sub-pixels of each color in the measurement region corresponding to the photometric region. The first process for adjusting the photometric region is executed for each of the plurality of photometric regions so that the measurement variation of the above is within a predetermined range.
In the step, Max (Δr, Δg, Δb) indicates the maximum value among Δr, Δg, and Δb, Min (Δr, Δg, Δb) indicates the minimum value among Δr, Δg, and Δb, and m is. It is the number of the second pixels in the measurement area, R_mes is the size of the red subpixels in the light measurement area, R_ref is the size of the red subpixels included in one second pixel, and G_mes is. The size of the green subpixel in the metering area, G_ref is the size of the green subpixel included in one second pixel, B_mes is the size of the blue subpixel in the metering area, and B_ref. When is the size of the blue sub-pixel included in one second pixel, the measurement variation Δ% is determined.
Δ% = {Max (Δr, Δg, Δb) -Min (Δr, Δg, Δb)} ÷ Max (Δr, Δg, Δb),
Δr = R_mes ÷ (m × R_ref),
Δg = G_mes ÷ (m × G_ref),
Δb = B_mes ÷ (m × B_ref)
It is calculated using a two-dimensional colorimetric method. A two-dimensional color measuring method for measuring a plurality of measurement areas in a color display screen by using a two-dimensional color measuring device including a two-dimensional imaging unit having a first pixel arranged in two dimensions.
The color display screen is arranged two-dimensionally and has a second pixel including a red subpixel, a green subpixel, and a blue subpixel.
A plurality of photometric regions including two or more of the first pixels are set corresponding to the plurality of measurement regions, and a photometric quantity generated by a difference in the number of sub-pixels of each color in the measurement region corresponding to the photometric region. The first process for adjusting the photometric region is executed for each of the plurality of photometric regions so that the measurement variation of the above is within a predetermined range.
In the step, the measurement variation is calculated using the photometric amount of the measurement area corresponding to the photometric area and the photometric amount of the magnified measurement area corresponding to the magnified photometric area having a larger size than the photometric area. Two-dimensional color measurement method.

Images