WO2018012478A1 - 測色計 - Google Patents
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- WO2018012478A1 WO2018012478A1 PCT/JP2017/025205 JP2017025205W WO2018012478A1 WO 2018012478 A1 WO2018012478 A1 WO 2018012478A1 JP 2017025205 W JP2017025205 W JP 2017025205W WO 2018012478 A1 WO2018012478 A1 WO 2018012478A1
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- 230000003595 spectral effect Effects 0.000 claims abstract description 64
- 238000002834 transmittance Methods 0.000 claims abstract description 36
- 238000003860 storage Methods 0.000 claims abstract description 34
- 238000005259 measurement Methods 0.000 claims description 210
- 230000003287 optical effect Effects 0.000 claims description 45
- 238000004364 calculation method Methods 0.000 claims description 30
- 239000013307 optical fiber Substances 0.000 claims description 20
- 238000012790 confirmation Methods 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 24
- 238000000034 method Methods 0.000 description 15
- 230000006870 function Effects 0.000 description 11
- 239000011159 matrix material Substances 0.000 description 11
- 238000012545 processing Methods 0.000 description 8
- 238000012937 correction Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 5
- 238000005401 electroluminescence Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 230000014509 gene expression Effects 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 239000003086 colorant Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 229930091051 Arenine Natural products 0.000 description 1
- 238000000774 X-filter Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
- G01J3/51—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using colour filters
Definitions
- the present invention relates to a colorimeter that measures the color display performance of a display device.
- Display devices are required to improve display performance.
- low luminance performance has been regarded as important.
- a measuring device that measures the display performance of a display device is also required to improve measurement accuracy at low luminance.
- High S / N (Signal Noise Ratio) is required to improve measurement accuracy at low luminance. This is because if the S / N is low, the signal is buried in noise, and chromaticity or luminance cannot be measured accurately.
- the first method is to increase the amount of light incident on the sensor.
- the second method is to reduce the noise of the measuring device.
- Patent Document 1 when measuring a display device having a display area of 133 mm ⁇ 75 mm, in Patent Document 1, since measurement is performed using measurement light from a measurement area having a diameter of 10 mm, the ratio of the area of the measurement area to the entire display area is 5 ⁇ 5 ⁇ ⁇ / (133 ⁇ 75) ⁇ 100 ⁇ 0.79% Therefore, the measuring apparatus used only 0.79% of the light amount of the display area for measurement.
- the viewing angle characteristic is better than that of a liquid crystal display. Therefore, when the object to be measured is an organic EL display, the amount of light used for measurement is reduced. It is possible to increase the S / N ratio.
- Patent Document 2 In order to increase the amount of light used for measurement, it is conceivable to employ a two-dimensional sensor having a large light receiving area as described in Patent Document 2, for example.
- a two-dimensional sensor is employed as a light receiving element, and a color filter for a spectral response suitable for color measurement is attached to the two-dimensional sensor.
- the present invention has been made in view of the above-described circumstances, and an object thereof is to provide a colorimeter capable of measuring with high accuracy while mounting a two-dimensional sensor.
- a colorimeter that reflects one aspect of the present invention has a light guide unit that introduces measurement light and a pixel region that includes a plurality of pixels. Between a light receiving sensor that outputs a light receiving signal from a plurality of pixels, and between the light guide unit and the light receiving sensor, and arranged to be opposed to a plurality of partial pixel regions that are part of the pixel region and are different from each other, A plurality of filters having different spectral transmittance characteristics, a storage unit for storing pixel positions of each pixel group used for calculation among the pixels included in each of the plurality of partial pixel regions, and each pixel group And an arithmetic control unit that calculates an index relating to color using each received light reception signal, and the pixel position of each pixel group is determined in advance based on the positional relationship between each of the plurality of filters and the light reception sensor. Demand It is.
- FIG. 5 is a view taken in the direction of arrow A in FIG. 4 when the two-dimensional sensor is viewed from the side in a direction orthogonal to the optical axis. It is a figure which shows the output data of a colorimeter when displaying red on a standard display apparatus. It is a figure which shows the area
- FIG. 2 schematically illustrates an embodiment comprising an optical fiber arranged around a rod lens.
- FIG. 2 schematically illustrates an embodiment comprising an optical fiber arranged around a rod lens.
- FIG. 2 schematically illustrates an embodiment comprising an optical fiber arranged around a rod lens. It is a figure which shows schematically embodiment which has arrange
- FIG. 6 schematically illustrates an embodiment comprising a bundle fiber. It is a figure which shows schematically the entrance plane of a bundle fiber. It is a figure which shows schematically the output surface of a bundle fiber.
- FIG. 6 schematically illustrates an embodiment with six filters.
- FIG. 6 schematically illustrates an embodiment with six filters. It is a figure which shows the spectral transmittance characteristic of each filter. It is a figure which shows the example of arrangement
- FIGS. 30 and 31 are diagrams schematically showing a state in which a color filter is attached to the light receiving surface of the two-dimensional sensor.
- a colorimeter with an expanded measurement area for example, as shown in FIG. 30, it is considered to use a monochrome two-dimensional sensor 2 in which color filters 1X, 1Y, and 1Z are attached to the light receiving surface. It is done.
- the light measurement amount corresponding to the color filter 1X is calculated, and based on the light reception signal output from the calculation region 2Y, The photometric quantity corresponding to the color filter 1Y is calculated, and the photometric quantity corresponding to the color filter 1Z is calculated based on the received light signal output from the calculation area 2Z.
- the attachment positions of the color filters 1X, 1Y, and 1Z are shifted as shown in FIG.
- a part of the color filter 1X may be disposed in the calculation region 2Y where the
- the light reception signal output by the light passing through the color filter 1X is included in the calculation region 2Y.
- the light reception signal output by the light passing through the gap between the color filter 1X and the color filter 1Y is also included in the calculation region 2Y.
- the photometric quantity corresponding to the color filter 1Y is calculated based on the light reception signal output from the calculation area 2Y, a measurement error occurs.
- the present inventor has come up with an invention capable of measuring with high accuracy while mounting a two-dimensional sensor.
- FIG. 1 is a block diagram schematically showing the configuration of a colorimeter according to an embodiment of the present invention.
- FIG. 2 is a diagram schematically showing a state in which the colorimeter shown in FIG. 1 is measuring an object to be measured.
- the display device 10 that is a device under test is, for example, an organic EL display.
- the display device 10 is not limited to an organic EL display, and may be another display such as a liquid crystal display or a plasma display.
- the colorimeter 20 of the present embodiment receives the measurement light 12 emitted from the display screen 11 of the display device 10.
- the colorimeter 20 includes a lens 30, an integrator optical system 40, an X filter 51, a Y filter 52, a Z filter 53, a two-dimensional sensor 60, an arithmetic control unit 70, and the like.
- the input unit 75 and the storage unit 80 are provided.
- the lens 30 (an example of a light guide unit) is disposed so as to face the display screen 11 of the display device 10.
- the lens 30 focuses the measurement light 12 emitted from the display screen 11 of the display device 10 and guides it to the light incident surface of the integrator optical system 40.
- the lens 30 may be composed of a single lens or a plurality of lenses.
- the integrator optical system 40 (an example of a mixing unit) is configured by a quadrangular prism rod lens.
- the integrator optical system 40 is also referred to as a rod lens 40.
- the measurement light 12 incident on the rod lens 40 repeats total reflection on the side surface of the rod lens 40, thereby mixing chromaticity unevenness and luminance unevenness on the display device 10, and illuminance distribution on the light receiving surface of the two-dimensional sensor 60. Is made uniform.
- the length of the rod lens 40 in the direction of the optical axis L0 is preferably 5 times or more the length in the direction orthogonal to the optical axis L0.
- the measurement light 12 is repeatedly totally reflected by the side surface of the rod lens 40 repeatedly for a certain number of times.
- the illuminance distribution can be made uniform.
- the integrator optical system 40 may be composed of a moth-eye lens.
- the eyelet lens has a structure in which a large number of square or regular hexagonal lenses are spread, and this structure generates a large number of light source images.
- the eyelet lens makes the illuminance distribution uniform on the light irradiation surface by the effect of superimposing the light source images whose positions are gradually shifted.
- the X filter 51, the Y filter 52, and the Z filter 53 each have a combined spectral responsivity with the spectral responsivity of the monochrome two-dimensional sensor 60.
- the X filter 51, the Y filter 52, and the Z filter 53 are formed in a thin film shape and are attached to the light receiving surface of the two-dimensional sensor 60.
- the two-dimensional sensor 60 (an example of a light receiving sensor) is composed of a CMOS sensor or a CCD sensor, and has a pixel region including a plurality of pixels arranged two-dimensionally.
- FIG. 3 is a diagram schematically showing the two-dimensional sensor 60 to which the filters 51, 52, and 53 are attached.
- FIG. 4 is a view in which a rod lens 40 is added to FIG.
- FIG. 5 is a view taken in the direction of arrow A in FIG. 4 when the two-dimensional sensor 60 is viewed from the side in a direction orthogonal to the optical axis L0.
- 3 and 4 are views of the two-dimensional sensor 60 viewed from the display device 10 side in the direction of the optical axis L0 in FIG.
- the upper left pixel coordinates of the two-dimensional sensor 60 are (1, 1), and the lower right pixel coordinates are (1920, 1080).
- the resolution of the sensor 60 is 1920 ⁇ 1080.
- the X filter 51, the Y filter 52, and the Z filter 53 are arranged side by side in the x-axis direction inside the 1920 ⁇ 1080 pixel area of the two-dimensional sensor 60, as shown in FIGS. A slight gap is provided between the X filter 51 and the Y filter 52 and between the Y filter 52 and the Z filter 53, respectively.
- the length of each side of the rectangular entrance surface 40a (exit surface 40b) of the rod lens 40 is the length of the filter region where the X filter 51, the Y filter 52, and the Z filter 53 are attached. It is set to fit inside.
- the size of the two-dimensional sensor 60 is, for example, 12 mm ⁇ 20 mm.
- the length of each side of the rectangular entrance surface 40a (exit surface 40b) of the rod lens 40 is, for example, 10 mm ⁇ 15 mm.
- the length of the rod lens 40 in the optical axis L0 direction is, for example, 50 mm.
- the input unit 75 includes, for example, a keyboard or a mouse.
- the measurer (user) inputs, for example, calibration tristimulus values (described later) using the input unit 75.
- the storage unit 80 includes a semiconductor memory or a hard disk. The storage unit 80 stores in advance position information of the X filter 51, the Y filter 52, and the Z filter 53 attached to the two-dimensional sensor 60.
- the storage unit 80 stores calibration data of tristimulus values input by the measurer using the input unit 75.
- the storage unit 80 stores tristimulus values for calibration or correction coefficients (matrix A described later) obtained in advance by a measurer (user).
- the arithmetic control unit 70 includes, for example, a central processing unit (CPU).
- the arithmetic control unit 70 operates in accordance with a program stored in the storage unit 80, so that the light reception signal output from the two-dimensional sensor 60 and the position information and the correction coefficient stored in the storage unit 80 are used. For example, the color of the measurement light 12 in the Luv color system is calculated.
- the position information of the X filter 51, the Y filter 52, and the Z filter 53 attached to the two-dimensional sensor 60 is calculated in advance at the production stage of the colorimeter 20 and stored in the storage unit 80.
- Tristimulus values or correction coefficients for calibration of the X filter 51, Y filter 52, and Z filter 53 are calculated in advance by the user of the colorimeter 20 before actual measurement and stored in the storage unit 80.
- a method for calculating these will be described.
- a method for calculating positional information of the X filter 51, the Y filter 52, and the Z filter 53 at the production stage of the colorimeter 20 will be described with reference to FIGS.
- a display device with known L value, u ′ value, and v ′ value in the Lu′v ′ color system (hereinafter referred to as “standard display device”) is colorimetrically measured. Measured with a total of 20.
- FIG. 6 is a diagram showing output data of the colorimeter 20 when, for example, the primary color of red is displayed on the standard display device.
- FIG. 7 is a diagram schematically showing a calculated X filter region (affixing position on the two-dimensional sensor 60). The positional information of the X filter 51, the Y filter 52, and the Z filter 53 is calculated by the following processes S1 to S8 and stored in the storage unit 80.
- the X filter 51 has a high spectral transmittance mainly for red. Therefore, using this, the region of the X filter 51 is specified by displaying red.
- Nx ⁇ ⁇ Pr (xmax, j) ⁇ Pr (xmin, j) ⁇ (1)
- j u to b.
- the green primary color is displayed on the entire display screen of the standard display device.
- the combined spectral response of the filters 51, 52, and 53 attached to the light receiving surface of the two-dimensional sensor 60 and the spectral response of the monochrome two-dimensional sensor 60 does not necessarily match the CIE color matching function. Therefore, in order to accurately measure the chromaticity even when the combined spectral response does not match the color matching function, a method for obtaining matrix calibration data using a spectral radiance meter is introduced.
- the user of the colorimeter 20 measures the tristimulus values when the three primary colors are displayed on the standard display device in advance using a spectral radiance meter or the like. More specifically, tristimulus values measured with a spectral radiance meter when red is displayed on a standard display device are Xr, Yr, and Zr. Similarly, tristimulus values measured with a spectral radiance meter when green is displayed on a standard display device are Xg, Yg, and Zg. Similarly, the tristimulus values measured with the spectral radiance meter when blue is displayed on the standard display device are Xb, Yb, and Zb.
- the user of the colorimeter 20 uses the input unit 75 to input the measured tristimulus values Xr, Yr, Zr, Xg, Yg, Zg, Xb, Yb, Zb.
- the arithmetic control unit 70 stores the tristimulus values Xr, Yr, Zr, Xg, Yg, Zg, Xb, Yb, Zb input using the input unit 75 in the storage unit 80.
- the tristimulus values Xr, Yr, Zr, Xg, Yg, Zg, Xb, Yb, and Zb input using the input unit 75 are examples of calibration data.
- the primary color of red is displayed on the entire display screen of the standard display device, and imaged by the two-dimensional sensor 60 of the colorimeter 20.
- the output of the two-dimensional sensor 60 at this time is S (x, y).
- the tristimulus values Xr_2d, Yr_2d, and Zr_2d at the time of red display are calculated by the above equations (2) to (4).
- the tristimulus values Xg_2d, Yg_2d, and Zg_2d at the time of green display are calculated by the above formulas (5) to (7).
- the tristimulus values Xb_2d, Yb_2d, and Zb_2d at the time of blue display are calculated by the above equations (8) to (10).
- A is a 3 ⁇ 3 matrix and includes nine elements (unknown numbers). As a result, since there are nine equations and nine unknowns, the elements of the matrix A can be calculated by solving these equations.
- the user inputs the calibration tristimulus values to the colorimeter 20 using the input unit 75.
- the calculation control unit 70 calculates the matrix A based on the tristimulus values, and stores the calculated matrix A in the storage unit 80 as a correction coefficient.
- the user may calculate the matrix A outside the colorimeter 20 and input the matrix A to the colorimeter 20 using the input unit 75.
- the arithmetic control unit 70 may store the input matrix A in the storage unit 80.
- the matrix A is an example of calibration data corresponding to each pixel group used for the calculation included in the first to third partial pixel areas.
- the contents to be measured such as white and red are displayed on the display screen 11 of the display device 10.
- the display device 10 is imaged by the colorimeter 20.
- the output of the two-dimensional sensor 60 at this time is S (x, y).
- positions where the X filter 51, the Y filter 52, and the Z filter 53 are attached to the two-dimensional sensor 60 are calculated in advance and stored in the storage unit 80. Further, correction coefficients for the X filter 51, the Y filter 52, and the Z filter 53 are calculated in advance and stored in the storage unit 80. Therefore, the tristimulus values X, Y, and Z of the display device 10 that is the object to be measured can be accurately calculated, and the luminance and chromaticity (Lu′v ′) can be obtained from these tristimulus values by calculation. it can.
- the integrator optical system 40 is disposed between the display device 10 as the object to be measured and the two-dimensional sensor 60, and the measurement light 12 is incident on the integrator optical system 40, whereby the measurement of FIG.
- the illuminance distribution of the light 12 is made uniform.
- the display screen of the object to be measured may not necessarily have uniform chromaticity or luminance, and the measurement value is affected by this non-uniformity.
- the measurement light 12 incident on the two-dimensional sensor 60 is emitted from a wide measurement region of the object to be measured using the two-dimensional sensor 60 having a two-dimensional pixel region as in the present embodiment, spatial Unevenness greatly affects measurement accuracy.
- the illuminance distribution is made uniform by using the integrator optical system 40, the measurement light 12 emitted from the display screen 11 of the display device 10 that is the object to be measured has uneven chromaticity or Even if there is a spatial unevenness such as a brightness unevenness, the influence of the unevenness on the measurement accuracy can be reduced.
- the diameter of the measurement region is, for example, 10 mm, which is much smaller than the size of the display device for the object to be measured, and the display device for the object to be measured is installed close to the colorimeter. . For this reason, even if it positioned visually, the situation which images a background other than a display screen did not occur.
- the integrator optical system 40 is disposed between the two-dimensional sensor 60 and the lens 30 to spatially mix the measurement light 12. Due to the influence of the mixing, the image information measured by the two-dimensional sensor 60 has no position information indicating which part of the display device 10 is being measured. As a result, the colorimeter 20 of the above embodiment cannot specify the measurement area on the display screen 11. In order to solve this problem, as shown in FIGS. 8 to 12, a configuration for specifying a measurement region on the display screen 11 may be added to the colorimeter 20 of the above embodiment.
- FIG. 8 to 10 are diagrams schematically showing an embodiment including an optical fiber 42 arranged around the rod lens 40.
- FIG. FIG. 8 is a side view seen from a direction orthogonal to the optical axis L0.
- 9 and 10 are front views of the object to be measured (display device 10) in the optical axis L0 direction.
- FIG. 9 shows only the rod lens 40 and the optical fiber 42.
- FIG. 10 shows the rod lens 40, the optical fiber 42, the two-dimensional sensor 60, and the filters 51 to 53, and represents the positional relationship between the optical fiber 42 and the filters 51 to 53.
- the two-dimensional sensor 60 can receive the measurement light 12 that has not been mixed via the optical fiber 42. Therefore, in the embodiment shown in FIGS. 8 to 10, the calculation control unit 70 can acquire the image signal including the position information by the two-dimensional sensor 60, so that the measurement region is outside the range of the display device 10. Can detect that it is not.
- FIG. 11 is a diagram schematically showing an embodiment in which a condensing lens 43 is arranged on the opposite side of the two-dimensional sensor 60 with respect to the rod lens 40.
- the condenser lens 43 (an example of a light receiving optical system) focuses the incident measurement light 12.
- the light receiving surface of the two-dimensional sensor 60 is disposed at the image forming position of the condensing lens 43, and the incident surface 40 a of the rod lens 40 is disposed at a position different from the image forming position of the condensing lens 43. .
- the arithmetic control unit 70 can acquire an image signal including position information via the two-dimensional sensor 60.
- the measurement light 12 from the condenser lens 43 is obstructed by the rod lens 40, the amount of light that forms an image on the two-dimensional sensor 60 is reduced, but there is no problem because it only determines the measurement region.
- FIG. 12 is a diagram schematically showing an embodiment including the half mirror 32 and the two-dimensional sensor 62.
- the half mirror 32 (an example of a branching portion) is disposed on the opposite side of the two-dimensional sensor 60 with respect to the rod lens 40.
- the half mirror 32 transmits a part of the measurement light 12 and guides it to the two-dimensional sensor 60, and reflects the rest and guides it to the two-dimensional sensor 62.
- the two-dimensional sensor 62 (an example of an image position confirmation sensor) receives the measurement light 12 reflected by the half mirror 32, that is, the measurement light 12 not mixed by the rod lens 40.
- the arithmetic control unit 70 can acquire an image signal including position information via the two-dimensional sensor 62.
- the two-dimensional sensor 62 may be a low-resolution sensor, as long as the positional relationship between the display area and the measurement area can be detected. Further, since the two-dimensional sensor 62 does not require a large amount of light, the half mirror 32 has a light amount ratio between the transmitted light and the reflected light of 5: 1 instead of 5: 5. A mirror having a difference in the light quantity ratio may be used.
- a movable mirror that can move between the position of the half mirror 32 of FIG. 12 and a position off the optical path of the measuring light 12 may be used.
- FIGS. 13 to 16 are diagrams schematically showing examples of various positional relationships between the display screen 11 of the object to be measured and the two-dimensional sensor 60.
- FIG. FIG. 17 is a block diagram schematically showing the colorimeter 20 to which the output unit 90 is added.
- the embodiment of FIGS. 13 to 17 includes an optical fiber 42 disposed around the rod lens 40, similar to the embodiment of FIGS. 13 to 16, the display area 11a corresponds to an image of the display screen 11 of the display device 10 formed by the lens 30.
- the output unit 90 includes, for example, an electronic buzzer and outputs a warning sound.
- the two-dimensional sensor 60 receives the measurement light 12 that passes through the optical fiber 42, that is, the measurement light 12 that is not mixed by the rod lens 40.
- the arithmetic control unit 70 uses the two-dimensional sensor 60 to acquire a light reception signal including position information.
- the arithmetic control unit 70 controls the output unit 90 to output a warning sound from the output unit 90 if the position of the display device 10 to be measured is shifted based on the acquired light reception signal.
- the display device 10 as the object to be measured is disposed at a normal position with respect to the colorimeter 20.
- the display area 11 a is larger than the area of the optical fiber 42 and smaller than the areas of the filters 51 to 53. Therefore, the arithmetic control unit 70 determines that the arrangement position of the display device 10 is normal, and does not output a warning sound from the output unit 90.
- the arithmetic control unit 70 determines that the arrangement position of the display device 10 is deviated from the normal state, and causes the output unit 90 to output a warning sound.
- the display area 11a is smaller and smaller than the area corresponding to the rod lens 40 (an example of a measurement area).
- the signal level of the region other than the region corresponding to the display region 11a among the received light signals output from the two-dimensional sensor 60 becomes zero.
- measurement light having a larger luminance unevenness than expected is incident on the rod lens 40.
- measurement light with extremely large luminance unevenness is incident on the rod lens 40. Will be. In this case, since it is difficult to sufficiently mix the measurement light, it is difficult to perform accurate measurement.
- the calculation control unit 70 can output a warning sound from the output unit 90 to notify the measurer of the warning.
- the integrator optical system 40 is provided, but the configuration for mixing the measurement light 12 is not limited to the integrator optical system 40.
- FIG. 18 is a diagram schematically showing an embodiment including a bundle fiber 44 instead of the integrator optical system 40.
- FIG. 19 is a diagram schematically showing the incident surface 44 a of the bundle fiber 44.
- FIG. 20 is a diagram schematically showing the exit surface 44 b of the bundle fiber 44, and shows a state viewed from the inside of the bundle fiber 44 toward the two-dimensional sensor 60.
- FIG. 19 shows a light incident area
- FIG. 20 shows a light emission area.
- the bundle fiber 44 an example of a mixing unit
- the position of the measurement light 12 on the incident surface 44a and the emission on the two-dimensional sensor 60 side are obtained.
- the position on the surface 44b is changed.
- the colorimeter 20 has a combined spectral response with the spectral response of the two-dimensional sensor 60 for the CIE color matching functions x ( ⁇ ), y ( ⁇ ), and z ( ⁇ ), respectively.
- the X filter 51, the Y filter 52, and the Z filter 53 having spectral transmittance characteristics that coincide with each other are provided, the present invention is not limited to this.
- it may be a multiband type colorimeter including four or more filters having different spectral transmittance characteristics.
- FIG. 21 and 22 are diagrams schematically showing an embodiment including six filters.
- FIG. 21 shows a state viewed from a direction orthogonal to the optical axis L0
- FIG. 22 shows a state viewed in the optical axis L0 direction.
- FIG. 23 is a diagram showing the spectral transmittance characteristics of each filter.
- the horizontal axis indicates the wavelength
- the vertical axis indicates the spectral transmittance.
- the six filters 54a, 54b, 54c, 54d, 54e, 54f have spectral transmittance characteristics P1, P2, P3, P4, P5, P6 shown in FIG.
- filters 54a to 54f are arranged on the two-dimensional sensor 60 in the order of the center wavelength of the spectral transmittance. That is, in FIG. 22, the filter 54a having the shortest spectral transmittance center wavelength is disposed at the upper left, the filter 54b having the next shortest spectral transmittance center wavelength is disposed below the filter 54a, and the spectral transmittance central wavelength.
- the filter 54c having the second shortest wavelength is disposed on the right side of the filter 54a, the filter 54d having the shortest center wavelength of the spectral transmittance is disposed below the filter 54c, and the filter 54e having the next shortest center wavelength of the spectral transmittance is the filter.
- a filter 54f having the longest spectral transmittance center wavelength is disposed below the filter 54e.
- the arrangement positions of the filters 54a to 54f are not limited to this.
- FIG. 24 is a diagram showing an arrangement example of six filters 54a to 54f different from FIG.
- the filter 54a with the shortest spectral transmittance center wavelength is arranged at the upper left, but under the filter 54a, the filter 54f with the longest spectral transmittance center wavelength is arranged. Is arranged.
- the arrangement positions of the filters 54c, 54d, and 54e are the same as those in FIG.
- a filter 54b having the second shortest center wavelength of spectral transmittance is disposed under the filter 54e having the second longest center wavelength of spectral transmittance.
- the filters 54a to 54f arranged on the two-dimensional sensor 60 are not arranged in the order of the center wavelength, but the two having shorter wavelengths are arranged apart from each other, and the longer wavelength side is arranged.
- the two may be arranged apart from each other so that the wavelengths are symmetrically positioned on the left and right of the two-dimensional sensor 60. With such an arrangement, it is possible to reduce the influence of spatial chromaticity or luminance unevenness on the display screen 11 of the display device 10. That is.
- the filters having the different light receiving wavelengths are arranged at close positions, the influence of spatial unevenness can be reduced.
- the X filter 51, the Y filter 52, and the Z filter 53 have substantially the same area, but the present invention is not limited to this.
- the short-wavelength quantum efficiency of a two-dimensional sensor is worse than the long-wavelength quantum efficiency. Therefore, a high S / N cannot be realized on the short-wavelength side unless a large amount of light is guided to the sensor. Therefore, for example, the areas of the X filter 51, the Y filter 52, and the Z filter 53 may be values corresponding to the respective light receiving sensitivities.
- the spectral radiance of the display device 10 to be measured is Le ( ⁇ )
- the area of the X filter 51 is 1 (reference value)
- the area of the Y filter 52 is Ay
- the area of the Z filter 53 is Assuming that Az is used, an area ratio that satisfies the following expression (21) may be adopted.
- the amount of light incident on the areas of the filters 51, 52, and 53 of the two-dimensional sensor 60 is substantially the same value. Can be. As a result, the S / N of the colorimeter 20 as a whole can be improved.
- FIG. 25 is a diagram illustrating an example in which the number of filters is changed in place of the area.
- the light receiving sensitivity of the Z filter 53 is lower than the light receiving sensitivity of the X filter 51 and the Y filter 52. Therefore, in the embodiment shown in FIG. 25, the two filters 51, 52 and 53 have the same area, and two Z filters 53 are used.
- the difference in the amount of light incident on the areas of the filters 51, 52, and 53 of the two-dimensional sensor 60 can be reduced compared to the embodiment of FIG. As a result, the S / N of the colorimeter 20 as a whole can be improved.
- each of the X-filter 51, the Y-filter 52, and the Z-filter 53 uses a relatively large area filter, but the present invention is not limited to this. .
- FIG. 26 is a diagram illustrating an example in which a plurality of filters 51, 52, and 53 having a small area are used.
- a set of filters 51, 52, 53 arranged side by side is arranged on the two-dimensional sensor 60 with three horizontally and five vertically.
- the size of the two-dimensional sensor 60 may be 10 mm ⁇ 18 mm, and the sizes of the filters 51, 52, and 53 may be approximately 2 mm.
- the number is not limited to 3 ⁇ 5, and may be m ⁇ n (m and n are integers of 2 or more).
- a zoom lens with variable magnification may be used as the condenser lens 43.
- the display area 11a for example, FIG. 13
- the area of the display area 11a can be made larger than the area of the measurement area by increasing the magnification of the condenser lens 43.
- a light shielding wall that blocks light may be provided between the filters 51, 52, 53.
- FIG. 27 is a diagram for explaining a problem when a light shielding wall is not provided between the filters.
- FIG. 28 is a diagram schematically showing an embodiment in which a light shielding wall is provided between the filters.
- FIG. 29 is a diagram illustrating another configuration example of the light shielding wall.
- the measurement lights 12a and 12b emitted from the emission surface 40b of the integrator optical system (rod lens) 40 are repeatedly totally reflected by the side surface 40c inside the rod lens 40 before being emitted. Therefore, not only light that enters the two-dimensional sensor 60 perpendicularly like the measurement light 12a but also light that enters the two-dimensional sensor 60 obliquely, such as the measurement light 12b, exists.
- Such measurement light 12 b passes through not only the X filter 51 but also the Y filter 52 before reaching the two-dimensional sensor 60. For this reason, the measurement light 12b becomes stray light in obtaining an accurate tristimulus value.
- light shielding walls 91 and 92 made of black partition walls may be provided between the X filter 51 and the Y filter 52 and between the Y filter 52 and the Z filter 53. .
- the light shielding walls 91 and 92 can prevent the measurement light 12 b emitted obliquely from the integrator optical system 40 from entering the two-dimensional sensor 60.
- the light shielding walls 91 and 92 may be formed of black partition walls that completely absorb light or white partition walls that totally reflect light.
- a light shielding wall 93 having a structure surrounding each of the filters 51, 52 and 53 may be used.
- the light shielding wall 93 may be fixed to the two-dimensional sensor 60.
- the filters 51, 52, and 53 may be dropped into the opening of the light shielding wall 93, respectively. Accordingly, the filters 51, 52, and 53 can be easily attached to the two-dimensional sensor 60.
- one type of pixel position is obtained and stored in the storage unit 80 as shown in FIG. 7, for example.
- the pixel positions of the filters 51, 52, and 53 multiple types of pixel positions may be obtained and stored in the storage unit 80 within the ranges included in the filters 51, 52, and 53, respectively.
- the arithmetic control unit 70 selects one pixel position from a plurality of types of pixel positions as the pixel positions of the filters 51, 52, and 53 according to the level of S / N, and the pixels in the region included in the selected pixel position
- the color may be calculated by using the light reception signal output from.
- the arithmetic control unit 70 may determine the S / N level based on the magnitude of the received light signal.
- the calculation control unit 70 may set the calculation area to an area smaller than Pr (xmin, u) to Pr (xmax, b) in FIG. In this case, the number of pixels used for the calculation is reduced. As a result, the calculation time can be reduced and measurement can be performed at high speed.
- One embodiment of the present invention includes a light guide portion that introduces measurement light emitted from a measurement object, and a pixel region that includes a plurality of pixels that are two-dimensionally arranged. Between a light receiving sensor that outputs a light receiving signal from the pixel and a plurality of partial pixel regions that are part of the pixel region and are different from each other between the light guide unit and the light receiving sensor.
- a plurality of filters having different spectral transmittance characteristics with respect to each other a storage unit that stores pixel positions of each pixel group used for calculation among pixels included in each of the plurality of partial pixel regions, and the plurality of parts
- An arithmetic control unit that calculates an index relating to color using a light reception signal output from each pixel group in a pixel region, and the pixel position of each pixel group includes each of the plurality of filters and the plurality of filters.
- Receiving Stored in the storage unit is obtained in advance based on the positional relationship between the sensor.
- the measurement light emitted from the object to be measured is introduced by the light guide.
- a light receiving sensor having a pixel region including a plurality of pixels arranged two-dimensionally
- a light receiving signal is output from the plurality of pixels.
- a plurality of filters having different spectral transmittance characteristics with respect to the wavelength are disposed so as to face a plurality of different partial pixel regions that are part of the pixel region. .
- pixel positions of a pixel group used for calculation are stored in the storage unit.
- An index related to the color is calculated by the arithmetic control unit using the light reception signal output from each pixel group in the plurality of partial pixel regions.
- the pixel position of each pixel group is obtained in advance based on the positional relationship between each of the plurality of filters and the light receiving sensor, and is stored in the storage unit. Therefore, according to this aspect, it is possible to measure with high accuracy while mounting the two-dimensional sensor.
- each pixel group of the light receiving sensor may output a light receiving signal having a spectral response that approximates a color matching function as the light receiving signal.
- the storage unit may further store calibration data or calibration data acquired in advance corresponding to each pixel group.
- the arithmetic control unit based on the received light signal output from each pixel group, and each calibration data or each calibration data corresponding to each pixel group, color as an index related to the color It may be calculated.
- a light receiving signal having a spectral response level approximating a color matching function is output as a light receiving signal from each pixel group of the light receiving sensor.
- the storage unit further stores calibration data acquired in advance corresponding to each pixel group.
- the arithmetic control unit calculates a color as an index relating to the color based on the light reception signal output from each pixel group and each calibration data corresponding to each pixel group. Therefore, according to this aspect, the color can be calculated with high accuracy.
- the plurality of partial pixel regions may include a first partial pixel region, a second partial pixel region, and a third partial pixel region.
- the plurality of filters include an X filter disposed facing the first partial pixel region, a Y filter disposed facing the second partial pixel region, and a third partial pixel region.
- a Z filter arranged.
- the X filter may be formed such that a spectral transmittance characteristic matches a combined spectral response with the light receiving sensor to the color matching function x ( ⁇ ).
- the Y filter may be formed such that a spectral transmittance characteristic matches a combined spectral response with the light receiving sensor to the color matching function y ( ⁇ ).
- the Z filter may be formed such that a spectral transmittance characteristic matches a combined spectral response with the light receiving sensor to the color matching function z ( ⁇ ).
- the X filter, the Y filter, and the Z filter each have the same spectral transmittance and the combined spectral response with the light receiving sensor matches the color matching functions x ( ⁇ ), y ( ⁇ ), and z ( ⁇ ). It is formed as follows. Therefore, according to this aspect, the tristimulus value can be calculated with high accuracy as the color-related index.
- the X filter, the Y filter, and the Z filter may have the same area.
- N (N is a positive integer)
- N X filters and Y filters may be provided.
- 2 ⁇ N Z filters may be provided.
- the entire area of the Z filter is twice the entire area of the X filter and the entire area of the Y filter.
- the transmitted light amount of the Z filter is about half as low as the transmitted light amount of the X filter and the Y filter, and the transmitted light amount of the X filter is almost the same value as the transmitted light amount of the Y filter.
- the level of the light reception signal output from the light reception sensor by the transmitted light of the X filter and the transmitted light of the Y filter are substantially the same value. For this reason, tristimulus values can be calculated with higher accuracy.
- a plurality of sets of the plurality of filters may be arranged side by side so as to face the light receiving sensor.
- the plurality of filters may include four or more filters having different spectral transmittance characteristics with respect to wavelengths.
- a light shield that is provided in a boundary region between the filters arranged side by side and whose normal direction of the light receiving surface of the light receiving sensor is longer than the filters and does not transmit the measurement light.
- a wall may be further provided.
- the accuracy of the index relating to the calculated color decreases.
- a light shielding wall that does not transmit the measurement light is provided in the boundary region between the filters arranged side by side in the normal direction of the light receiving surface of the light receiving sensor longer than each filter. . Therefore, according to this aspect, the measurement light emitted from the object to be measured does not pass through the plurality of filters and enter the light receiving surface of the light receiving sensor. For this reason, it is possible to prevent a decrease in the accuracy of the color-related index.
- the light shielding wall may have a frame shape integrally formed so as to surround the periphery of each filter.
- the light shielding wall has a frame shape formed integrally so as to surround the periphery of each filter. Therefore, according to this aspect, when arranging each filter, each filter can be easily arranged by being fitted into a frame-shaped light shielding wall.
- the light guide unit is disposed between the device under test and the plurality of filters, the light incident surface is disposed on the device under test side, and the light exit surface is disposed on the plurality of filter sides.
- a mixing unit that mixes the measurement light incident on the light incident surface and emits the measurement light from the light emitting surface toward the plurality of filters, and is disposed outside the light incident surface and the light emitting surface of the mixing unit.
- an optical fiber that guides the measurement light to the plurality of filters without passing through the mixing unit.
- the arithmetic control unit uses a light reception signal output from the two-dimensional sensor on which the measurement light guided by the optical fiber is incident on the object to be measured corresponding to the light incident surface of the mixing unit. You may calculate the position of a measurement area
- the measurement light incident on the light incident surface is mixed by the mixing unit disposed between the object to be measured and the plurality of filters, and emitted from the light exit surface toward the plurality of filters. Therefore, even if there is a spatial unevenness in the measurement light emitted from the object to be measured, the influence of the spatial unevenness is reduced by mixing the measurement light.
- the measurement light is mixed by the mixing unit, the position of the measurement region on the measurement object corresponding to the light incident surface of the mixing unit and the position of the display region on the measurement object that emits measurement light are detected. It will be difficult to do.
- the measurement light is guided to the plurality of filters without passing through the mixing unit by the optical fibers disposed outside the light incident surface and the light output surface of the mixing unit.
- the calculation control unit controls the position of the measurement region on the measurement object corresponding to the light incident surface of the mixing unit, and the measurement The position of the display area on the object to be measured that emits light is calculated. Therefore, according to this aspect, the position of the measurement region on the object to be measured corresponding to the light incident surface of the mixing unit and the measurement light by the optical fiber disposed outside the light incident surface and the light emitting surface of the mixing unit. It is possible to detect the position of the display area on the measurement object that emits light.
- the light guide unit is disposed between the device under test and the plurality of filters, the light incident surface is disposed on the device under test side, and the light exit surface is disposed on the plurality of filter sides.
- the measurement light that is disposed between the mixing unit that mixes the measurement light incident on the light incident surface and emits the measurement light from the light emission surface toward the plurality of filters, and the measurement object and the mixing unit.
- a light receiving optical system that forms an image.
- the light receiving sensor may be disposed at an image forming position by the light receiving optical system.
- the mixing unit may be arranged at a position other than an image forming position by the light receiving optical system.
- the arithmetic control unit uses the light receiving signal output from the two-dimensional sensor on which the measurement light imaged by the light receiving optical system is incident, and the object to be measured corresponding to the light incident surface of the mixing unit The position of the upper measurement area and the position of the display area on the object to be measured that emits the measurement light may be calculated.
- the measurement light incident on the light incident surface is mixed by the mixing unit disposed between the object to be measured and the plurality of filters, and emitted from the light exit surface toward the plurality of filters. Therefore, even if there is a spatial unevenness in the measurement light emitted from the object to be measured, the influence of the spatial unevenness is reduced by mixing the measurement light.
- the measurement light is mixed by the mixing unit, the position of the measurement region on the measurement object corresponding to the light incident surface of the mixing unit and the position of the display region on the measurement object that emits measurement light are detected. It will be difficult to do.
- the light receiving sensor is disposed at an imaging position by a light receiving optical system disposed between the object to be measured and the mixing unit.
- the position of the measurement region on the object to be measured corresponding to the light incident surface of the mixing unit is calculated by the arithmetic control unit using the received light signal output from the two-dimensional sensor on which the measurement light imaged by the light receiving optical system is incident.
- the position of the display area on the object to be measured that emits the measurement light is calculated. Therefore, according to this aspect, since the light receiving sensor is arranged at the image forming position by the light receiving optical system, the position of the measurement region on the object to be measured corresponding to the light incident surface of the mixing unit and the measurement light are emitted. It is possible to detect the position of the display area on the object to be measured.
- the light receiving optical system may be an optical system having a variable magnification.
- the image processing apparatus may further include an image position confirmation sensor that has a pixel region including a plurality of pixels arranged two-dimensionally and outputs a light reception signal from the plurality of pixels when the measurement light is incident.
- the light guide unit includes a light incident surface disposed on the measured object side and a light emitting surface disposed on the plurality of filter sides between the measured object and the plurality of filters, and is incident on the light incident surface.
- the measurement light is mixed between the measurement light that is mixed and emitted from the light exit surface toward the plurality of filters, and the measurement light that is disposed between the object to be measured and the mixing part, and travels toward the mixing part.
- a branching portion that at least partially guides the image position confirmation sensor.
- the calculation control unit uses the light reception signal output from the image position confirmation sensor on which the measurement light guided by the branching unit is incident, and the measurement object corresponding to the light incident surface of the mixing unit The position of the upper measurement area and the position of the display area on the object to be measured that emits the measurement light may be calculated.
- the measurement light incident on the light incident surface is mixed by the mixing unit disposed between the object to be measured and the plurality of filters, and emitted from the light exit surface toward the plurality of filters. Therefore, even if there is a spatial unevenness in the measurement light emitted from the object to be measured, the influence of the spatial unevenness is reduced by mixing the measurement light.
- the measurement light is mixed by the mixing unit, the position of the measurement region on the measurement object corresponding to the light incident surface of the mixing unit and the position of the display region on the measurement object that emits measurement light are detected. It will be difficult to do.
- At least a part of the measurement light directed to the mixing unit is guided to the image position confirmation sensor by the branching unit disposed between the object to be measured and the mixing unit.
- the calculation control unit and the position of the measurement region on the object to be measured corresponding to the light incident surface of the mixing unit The position of the display area on the object to be measured that emits the measurement light is calculated. Therefore, according to this aspect, at least part of the measurement light directed to the mixing unit is guided to the image position confirmation sensor by the branching unit disposed between the object to be measured and the mixing unit. It is possible to detect the position of the measurement region on the measurement object corresponding to the light incident surface and the position of the display region on the measurement object that emits the measurement light.
- an output unit that outputs a warning may be further provided.
- the arithmetic control unit is configured to determine the measurement area based on the calculated position of the measurement area on the measurement object and the position of the display area on the measurement object that emits the calculated measurement light. The size may be compared with the size of the display area, and if the measurement area is larger than the display area, the output unit may output a warning.
- the measurement region on the object to be measured is a region corresponding to the light incident surface of the mixing unit.
- the measurement area on the object to be measured is larger than the display area on the object to be measured that emits measurement light
- the measurement light is not incident on the light incident surface of the mixing unit corresponding to the area other than the display area.
- the light having a large luminance unevenness is incident on the light incident surface of the mixing unit. For this reason, since the measurement light is not sufficiently mixed, it is difficult to perform accurate measurement.
- a warning is output from the output unit when the measurement area on the object to be measured is larger than the display area on the object to be measured that emits measurement light. Therefore, according to this aspect, it is possible to notify the measurer (user) that it is difficult to perform accurate measurement.
- an output unit that outputs a warning may be further provided.
- the arithmetic control unit is configured to determine the measurement area based on the calculated position of the measurement area on the measurement object and the position of the display area on the measurement object that emits the calculated measurement light. It may be determined whether or not the display area overlaps, and if at least a part of the measurement area does not overlap the display area, a warning may be output to the output unit.
- the measurement region on the object to be measured is a region corresponding to the light incident surface of the mixing unit.
- the measurement is performed on the light incident surface of the mixing unit corresponding to the area that does not overlap the display area. Since no light is incident, light with large luminance unevenness is incident on the light incident surface of the mixing unit. For this reason, since the measurement light is not sufficiently mixed, it is difficult to perform accurate measurement.
- the mixing unit may include an integrator optical system configured with a rod lens.
- the mixing unit may include an integrator optical system including a fly-eye lens.
- the mixing unit may include a bundle fiber.
- each of the plurality of filters may have an area in which transmitted light amounts are mutually matched.
- each of the plurality of filters has an area such that the transmitted light amounts coincide with each other. Therefore, according to this aspect, the level difference between the respective light reception signals output from the two-dimensional sensor by the measurement light passing through the respective filters is small. As a result, the S / N of the apparatus can be improved.
- the filter having the longest wavelength and the shortest filter when the transmittance is a peak value may be arranged adjacent to each other.
- the filter with the longest wavelength and the shortest filter when the transmittance is the peak value are arranged adjacent to each other. Therefore, according to this aspect, compared with the case where a plurality of filters are arranged in the order of wavelengths when the transmittance is a peak value, the influence of unevenness of measurement light emitted from the object to be measured is reduced. be able to.
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Abstract
Description
5×5×π/(133×75)×100≒0.79%
であり、測定装置は、表示領域の0.79%の光量しか測定に使用していなかった。
図30、図31は、それぞれ、2次元センサの受光面にカラーフィルタが貼り付けられた状態を概略的に示す図である。最初に、図30、図31を用いて、本発明の基礎となった知見が説明される。
以下、本発明に係る実施の一形態が図面を用いて説明される。なお、各図において、同一の構成には同一の符号が付され、適宜、その説明は省略される。
まず、標準表示装置の表示画面全体に赤の原色を表示させる。Xフィルタ51は、主に赤色に対する分光透過率が高い。そこで、これを利用して、赤色を表示させることによりXフィルタ51の領域を特定する。
赤色が表示された標準表示装置の表示画面を、測色計20の2次元センサ60で撮像する。このときの2次元センサ60の出力をS(x,y)とする。図6では、説明の簡単のために,y座標が540におけるx軸方向の断面が示されている。
2次元センサ60から出力される受光信号において、予め設定された閾値Th_r以上になる、x座標が最小の画素番号Pr(xmin,540)とx座標が最大の画素番号Pr(xmax,540)とを求める。
y軸方向にy=1~1080までy座標を順次変更して、処理S2,S3と同様の操作を行う。これによって、図7に示されるように、2次元センサ60上における、Xフィルタ51が貼り付けられた画素領域が特定される。
三刺激値を演算する際に、Xフィルタ51の計算に使用する画素数Nxを式(1)により算出する。
Nx=Σ{Pr(xmax,j)-Pr(xmin,j)} (1)
ここで、j=u~bである。
処理S4で求めたPr(xmin,j),Pr(xmax,j),j=u~bと、処理S5で求めた画素数Nxとを、測色計20の記憶部80に記憶させる。
次に、標準表示装置の表示画面全体に緑の原色を表示させる。Yフィルタ52は、主に緑色に対する分光透過率が高い。そこで、これを利用して、緑色を表示させることによりYフィルタ52の領域を特定する。すなわち、処理S2~S5と同様の動作を行う。そして、Pg(xmin,j),Pg(xmax,j),j=u~bと、画素数Nyとを、測色計20の記憶部80に記憶させる。
次に、標準表示装置の表示画面全体に青の原色を表示させる。Zフィルタ53は、主に青色に対する分光透過率が高い。そこで、これを利用して、青色を表示させることによりZフィルタ53の領域を特定する。すなわち、処理S2~S5と同様の動作を行う。そして、Pb(xmin,j),Pb(xmax,j),j=u~bと、画素数Nzとを、測色計20の記憶部80に記憶させる。
Xr_2d=ΣΣ{S(x,y)}
x=Pr(xmin,j)~Pr(xmax,j)&j=u~b/Nx (2)
Yr_2d=ΣΣ{S(x,y)}
x=Pg(xmin,j)~Pg(xmax,j)&j=u~b/Ny (3)
Zr_2d=ΣΣ{S(x,y)}
x=Pb(xmin,j)~Pb(xmax,j)&j=u~b/Nz (4)
上記式(2)~(4)によって、赤色表示時の三刺激値Xr_2d,Yr_2d,Zr_2dを算出する。
Xg_2d=ΣΣ{S(x,y)}
x=Pr(xmin,j)~Pr(xmax,j)&j=u~b/Nx (5)
Yg_2d=ΣΣ{S(x,y)}
x=Pg(xmin,j)~Pg(xmax,j)&j=u~b/Ny (6)
Zg_2d=ΣΣ{S(x,y)}
x=Pb(xmin,j)~Pb(xmax,j)&j=u~b/Nz (7)
上記式(5)~(7)によって、緑色表示時の三刺激値Xg_2d,Yg_2d,Zg_2dを算出する。
Xb_2d=ΣΣ{S(x,y)}
x=Pr(xmin,j)~Pr(xmax,j)&j=u~b/Nx (8)
Yb_2d=ΣΣ{S(x,y)}
x=Pg(xmin,j)~Pg(xmax,j)&j=u~b/Ny (9)
Zb_2d=ΣΣ{S(x,y)}
x=Pb(xmin,j)~Pb(xmax,j)&j=u~b/Nz (10)
上記式(8)~(10)によって、青色表示時の三刺激値Xb_2d,Yb_2d,Zb_2dを算出する。
Xr Xr_2d
Yr = A × Yr_2d (11)
Zr Zr_2d
が成立し、緑色表示時の三刺激値に関し、
Xg Xg_2d
Yg = A × Yg_2d (12)
Zg Zg_2d
が成立し、青色表示時の三刺激値に関し、
Xb Xb_2d
Yb = A × Yb_2d (13)
Zb Zb_2d
が成立する。
X_2d=ΣΣ{S(x,y)}
x=Pr(xmin,j)~Pr(xmax,j)&j=u~b/Nx (14)
Y_2d=ΣΣ{S(x,y)}
x=Pg(xmin,j)~Pg(xmax,j)&j=u~b/Ny (15)
Z_2d=ΣΣ{S(x,y)}
x=Pb(xmin,j)~Pb(xmax,j)&j=u~b/Nz (16)
上記式(14)~(16)によって算出する。
X X_2d
Y = A × Y_2d (17)
Z Z_2d
上記式(17)によって算出する。
(1)上記実施形態のように、被測定物である表示装置10の測定領域が大きくなると、測色計20と表示装置10との位置関係によって、測色計20は、表示画面11以外の部分を測定してしまう可能性がある。その場合には、正確な色度、輝度を測定できなくなる。特に、表示装置10の生産ラインにおいて、測色計20を用いて表示装置10の色検査を行う場合には、測定すべき表示装置10が測色計20に対して配置される位置が個々の表示装置10によって異なることがあり得る。
x(λ)=Fx(λ)×Sm(λ) (18)
y(λ)=Fy(λ)×Sm(λ) (19)
z(λ)=Fz(λ)×Sm(λ) (20)
上記式(18)、(19)、(20)が成立する。
=Ay×∫Fy(λ)×Sm(λ)×Le(λ)dλ
=Az×∫Fz(λ)×Sm(λ)×Le(λ)dλ (21)
Claims (19)
- 被測定物から出射された測定光を導入する導光部と、
2次元的に配列された複数の画素を含む画素領域を有し、前記測定光が入射すると前記複数の画素から受光信号を出力する受光センサと、
前記導光部と前記受光センサとの間において、前記画素領域の一部であって互いに異なる複数の部分画素領域にそれぞれ対向して配置され、波長に対する分光透過率の特性が互いに異なる複数のフィルタと、
前記複数の部分画素領域にそれぞれ含まれる画素のなかで、演算に使用する各画素群の画素位置を記憶する記憶部と、
前記複数の部分画素領域内の前記各画素群からそれぞれ出力される受光信号を用いて、色に関する指標を算出する演算制御部と、
を備え、
前記各画素群の画素位置は、前記複数のフィルタの各々と前記受光センサとの位置関係に基づき予め求められて前記記憶部に記憶されている、
測色計。 - 前記受光センサの前記各画素群は、前記受光信号として、それぞれ等色関数に近似する分光応答度を有する受光信号を出力し、
前記記憶部は、さらに、前記各画素群に対応してそれぞれ予め取得された校正用データ又は校正データを記憶し、
前記演算制御部は、前記各画素群からそれぞれ出力される前記受光信号と、前記各画素群に対応する前記各校正用データ又は前記各校正データとに基づいて、前記色に関する指標として、色を算出する、
請求項1に記載の測色計。 - 前記複数の部分画素領域は、第1部分画素領域と、第2部分画素領域と、第3部分画素領域と、を含み、
前記複数のフィルタは、前記第1部分画素領域に対向して配置されたXフィルタと、前記第2部分画素領域に対向して配置されたYフィルタと、前記第3部分画素領域に対向して配置されたZフィルタと、を含み、
前記Xフィルタは、分光透過率の特性が、前記受光センサとの合成分光応答度が等色関数x(λ)に一致するように形成され、
前記Yフィルタは、分光透過率の特性が、前記受光センサとの合成分光応答度が等色関数y(λ)に一致するように形成され、
前記Zフィルタは、分光透過率の特性が、前記受光センサとの合成分光応答度が等色関数z(λ)に一致するように形成され、
請求項2に記載の測色計。 - 前記Xフィルタと前記Yフィルタと前記Zフィルタとは、同一面積を有し、
N(Nは正の整数)個の前記Xフィルタ及び前記Yフィルタを備え、
2×N個の前記Zフィルタを備える、
請求項3に記載の測色計。 - 前記複数のフィルタからなる組が、さらに複数並べられて前記受光センサに対向して配置されている、
請求項2に記載の測色計。 - 前記複数のフィルタは、波長に対する分光透過率の特性が互いに異なる4個以上のフィルタを含む、
請求項1に記載の測色計。 - 並んで配置された前記各フィルタの互いの境界領域に設けられ、前記受光センサの受光面の法線方向の長さが前記各フィルタより長く、前記測定光を透過しない遮光壁をさらに備える請求項1~6のいずれか1項に記載の測色計。
- 前記遮光壁は、前記各フィルタの周囲を取り囲むように一体的に形成された枠形状を有する、
請求項7に記載の測色計。 - 前記導光部は、
前記被測定物と前記複数のフィルタとの間において、光入射面が前記被測定物側に、光出射面が前記複数のフィルタ側に配置され、前記光入射面に入射した前記測定光をミキシングして前記光出射面から前記複数のフィルタに向けて出射するミキシング部と、
前記ミキシング部の前記光入射面及び前記光出射面の外側に配置され、前記ミキシング部を通らずに前記測定光を前記複数のフィルタに導く光ファイバと、
を含み、
前記演算制御部は、前記光ファイバによって導かれた前記測定光が入射した前記2次元センサから出力される受光信号を用いて、前記ミキシング部の前記光入射面に対応する前記被測定物上の測定領域の位置と、前記測定光を出射する前記被測定物上の表示領域の位置とを算出する、
請求項1~8のいずれか1項に記載の測色計。 - 前記導光部は、
前記被測定物と前記複数のフィルタとの間において、光入射面が前記被測定物側に、光出射面が前記複数のフィルタ側に配置され、前記光入射面に入射した前記測定光をミキシングして前記光出射面から前記複数のフィルタに向けて出射するミキシング部と、
前記被測定物と前記ミキシング部との間に配置され、前記測定光を結像する受光光学系と、
を含み、
前記受光センサは、前記受光光学系による結像位置に配置され、
前記ミキシング部は、前記受光光学系による結像位置以外の位置に配置され、
前記演算制御部は、前記受光光学系により結像された前記測定光が入射した前記2次元センサから出力される受光信号を用いて、前記ミキシング部の前記光入射面に対応する前記被測定物上の測定領域の位置と、前記測定光を出射する前記被測定物上の表示領域の位置とを算出する、
請求項1~8のいずれか1項に記載の測色計。 - 前記受光光学系は、倍率が可変の光学系である、
請求項10に記載の測色計。 - 2次元的に配列された複数の画素を含む画素領域を有し、前記測定光が入射すると前記複数の画素から受光信号を出力する画像位置確認用センサをさらに備え、
前記導光部は、
前記被測定物と前記複数のフィルタとの間において、光入射面が前記被測定物側に、光出射面が前記複数のフィルタ側に配置され、前記光入射面に入射した前記測定光をミキシングして前記光出射面から前記複数のフィルタに向けて出射するミキシング部と、
前記被測定物と前記ミキシング部との間に配置され、前記ミキシング部に向かう前記測定光の少なくとも一部を前記画像位置確認用センサに導く分岐部と、
を含み、
前記演算制御部は、前記分岐部により導かれた前記測定光が入射した前記画像位置確認用センサから出力される受光信号を用いて、前記ミキシング部の前記光入射面に対応する前記被測定物上の測定領域の位置と、前記測定光を出射する前記被測定物上の表示領域の位置とを算出する、
請求項1~8のいずれか1項に記載の測色計。 - 警告を出力する出力部をさらに備え、
前記演算制御部は、前記算出された前記被測定物上の測定領域の位置と、前記算出された前記測定光を出射する前記被測定物上の表示領域の位置とに基づき、前記測定領域の大きさと前記表示領域の大きさとを比較し、前記測定領域が前記表示領域より大きい場合に、前記出力部に警告を出力させる、
請求項9~12のいずれか1項に記載の測色計。 - 警告を出力する出力部をさらに備え、
前記演算制御部は、前記算出された前記被測定物上の測定領域の位置と、前記算出された前記測定光を出射する前記被測定物上の表示領域の位置とに基づき、前記測定領域と前記表示領域とが重なるか否かを判定し、前記測定領域の少なくとも一部が前記表示領域と重ならない場合に、前記出力部に警告を出力させる、
請求項9~12のいずれか1項に記載の測色計。 - 前記ミキシング部は、ロッドレンズで構成されたインテグレータ光学系を含む、
請求項9~14のいずれか1項に記載の測色計。 - 前記ミキシング部は、蠅の目レンズで構成されたインテグレータ光学系を含む、
請求項9~14のいずれか1項に記載の測色計。 - 前記ミキシング部は、バンドルファイバを含む、
請求項9~14のいずれか1項に記載の測色計。 - 前記複数のフィルタは、それぞれ、透過光量が互いに一致するような面積を有する、
請求項1~17のいずれか1項に記載の測色計。 - 前記複数のフィルタのうち、透過率がピーク値のときの波長が最長のフィルタと最短のフィルタとは、隣接して配置されている、
請求項6に記載の測色計。
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