JPWO2016203902A1 - Optical characteristic measuring apparatus and setting method of optical characteristic measuring apparatus - Google Patents

Abstract

The optical characteristic measurement apparatus uses an input unit to which the first exposure time and the first integration number are input, and the input first exposure time and the first integration number for measurement using the spectroscopic sensor. A calculation unit for calculating a measurement time (first measurement time) using the spectroscopic sensor, a first measurement time, and a measurement time (second measurement time) using the two-dimensional image sensor, A determination unit that determines at least one of the second exposure time and the second integration number in the measurement using the two-dimensional image sensor so as to reduce or eliminate the difference.

Description

  The present invention relates to a technique for measuring optical characteristics of a display screen, for example.

  The optical property measurement device is a device that measures optical properties (for example, color, luminance, and gloss) using an optical sensor. The two-dimensional colorimeter is a kind of optical characteristic measuring device and measures the color of the measurement surface. Two-dimensional colorimeters are applied in various industrial fields, and are used, for example, for measuring the chromaticity distribution of a display screen.

  Focusing on the feature that the spectroscopic sensor can measure the color of the measurement point (in other words, the spot region) with high accuracy, a two-dimensional colorimeter that combines the spectroscopic sensor and an imaging unit that captures a two-dimensional color image is used. Proposed. For example, Patent Literature 1 discloses a beam splitter that divides light from a measurement object into two parts, an imaging unit that receives one of the two divided lights, a spectral sensor that receives the other of the two divided lights, and a spectral sensor. The tristimulus value is calculated using the spectral distribution of the measurement points measured by the above, and the tristimulus value of each pixel is calculated using the tristimulus value and the data of each pixel of the measurement region imaged by the imaging unit. There is disclosed a two-dimensional colorimeter including an arithmetic unit that calculates The imaging unit is a sensor that combines a monochrome CCD sensor and a filter that approximates a color matching function of the XYZ color system.

  According to the two-dimensional colorimeter, measurement using an imaging unit including a CCD sensor and measurement using a spectroscopic sensor are performed. In the measurement using these optical sensors (CCD sensor, spectral sensor), the exposure time and the number of integrations are set. The exposure time is the time during which the optical sensor is exposed during measurement. The two-dimensional colorimeter performs measurement a plurality of times and integrates the measurement values in each measurement to reduce the error in the measurement values. The number of integrations is the number of measurement values integrated. The integrated measurement value may be sent to the next process as it is, or an average value obtained by dividing the integrated measurement value by the number of integrations may be sent to the next process.

  The measurement time of measurement using an optical sensor depends on the exposure time and the number of integrations. If the exposure time is increased or the number of integrations is increased, the measurement time becomes longer. In contrast, if the exposure time is shortened or the number of integrations is decreased, the measurement time is shortened.

  In the two-dimensional colorimeter, a predetermined exposure time and integration number are set for the imaging unit and the spectral sensor, respectively. When the measurer sets the exposure time and the number of integrations for each of these optical sensors, the present inventor sets the measurement time for measurement using one optical sensor and the measurement time for measurement using the other optical sensor. It has been found that large differences may occur. Of the two optical sensors, the optical sensor with a short measurement time must be on standby during that time. When a large difference occurs between the measurement times of the two optical sensors, an optical sensor with a short measurement time has a long standby time, and the use efficiency of the optical sensor is deteriorated.

Japanese Patent No. 3246021

  The present invention provides an optical property measuring apparatus capable of preventing a long standby time from occurring when any of the optical sensors is measured using two optical sensors, and a method for setting the optical property measuring apparatus. The purpose is to do.

  An optical characteristic measuring apparatus according to the present invention that achieves the above object includes a first optical sensor having a measurement range of a two-dimensional region in a measurement object, and a spot that is included in the two-dimensional region and narrower than the two-dimensional region. For the measurement using one of the second optical sensor having the region as the measurement range, the first optical sensor, and the second optical sensor, the first exposure time and the first integration number are A first measurement that is a measurement time of measurement using the one optical sensor, using the input unit that is input, the first exposure time and the first integration number that are input to the input unit. A calculation unit that calculates time; the first measurement time; and a second measurement time that is a measurement time of measurement using the other optical sensor of the first optical sensor and the second optical sensor; Or the difference between To eliminate, and a determination unit for determining at least one of the second exposure time and the second accumulation count for each measurement using an optical sensor of the other.

  The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

It is a block diagram which shows the structure of the optical characteristic measuring apparatus which concerns on this embodiment. It is explanatory drawing explaining the functional block of a control processing part. It is a graph which shows tristimulus value R, G, B of a certain pixel among each pixel of the measurement area | region which the two-dimensional image sensor imaged (measured). It is a graph which shows the color matching function of XYZ color system. It is a comparison figure which compares the measurement time of the measurement using a spectroscopic sensor with the measurement time of the measurement using a two-dimensional image sensor. In this embodiment, the flowchart explaining the process which sets the exposure time and the frequency | count of integration in the measurement using a spectroscopic sensor, and the exposure time and the frequency | count of integration in the measurement using a two-dimensional image sensor in a control processing part. is there. In this embodiment, it is a comparison figure which compares the measurement time of the measurement using a spectral sensor with the measurement time of the measurement using a two-dimensional image sensor. In the first modification of the present embodiment, a process of setting the exposure time and the number of integrations in the measurement using the spectroscopic sensor and the exposure time and the number of integrations in the measurement using the two-dimensional image sensor in the control processing unit. It is a flowchart to explain. In the modification 1, it is the 1st comparison figure which compares the measurement time of measurement using a spectroscopic sensor, and the measurement time of measurement using a two-dimensional image sensor. It is the 2nd comparison figure. In the second modification of the present embodiment, a process for setting the exposure time and the number of integrations in the measurement using the spectroscopic sensor and the exposure time and the number of integrations in the measurement using the two-dimensional image sensor in the control processing unit. It is a flowchart to explain. It is a graph which shows the relationship between the exposure time in measurement using a spectroscopic sensor, the frequency | count of integration, and measurement time. It is a figure which shows an example of the table used in order to determine the exposure time and the frequency | count of integration in the measurement using a two-dimensional image sensor.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an optical characteristic measuring apparatus 1 according to the present embodiment. The optical characteristic measuring apparatus 1 is a two-dimensional colorimeter that measures a light source color, and includes a light receiving unit 2 and a main body unit 3.

  The measurement target of the optical property measuring apparatus 1 is the optical property (for example, brightness, hue) of various light emitters. Brightness means the luminance and luminous intensity of the light emitter. Hue means chromaticity coordinates, dominant wavelength, stimulus purity, correlated color temperature of the illuminant. As a measurement target, the screen of the flat panel display 4 will be described as an example.

  The light receiving unit 2 includes an optical lens 5, a beam splitter 6, a color filter 7, a two-dimensional image sensor 8, and a spectral sensor 9. In the present embodiment, the two-dimensional image sensor 8 is the first optical sensor and the other optical sensor. The spectroscopic sensor 9 is the second optical sensor and one of the optical sensors.

  The optical lens 5 focuses light from the screen of the flat panel display 4. The beam splitter 6 (an example of a light splitting unit) splits the focused light into two. More specifically, the beam splitter 6 transmits part of the focused light and reflects the rest. The transmitted light is referred to as light L1, and the reflected light is referred to as light L2. The beam splitter 6 transmits, for example, 10 percent of the focused light and reflects 90 percent.

  An RGB color filter 7 and a two-dimensional image sensor 8 are arranged in the optical path of the light L1. The color filter 7 includes a filter that transmits the R component, a filter that transmits the G component, and a filter that transmits the B component.

  The two-dimensional image sensor 8 is a CCD, for example, and is an optical sensor having a two-dimensional area as a measurement range. The two-dimensional image sensor 8 receives the light L1 through the color filter 7 to pick up the light source color of the two-dimensional region (entire or part of the screen of the flat panel display 4) that is the measurement range, and the image Is generated (in other words, a measured value).

  A spectroscopic sensor 9 is disposed in the optical path of the light L2. The spectroscopic sensor 9 uses a spot region included in the two-dimensional region imaged by the two-dimensional image sensor 8 as a measurement range. The spot area has an angle of view of, for example, 0.1 to 3 degrees and is narrower than the two-dimensional area.

  The spectroscopic sensor 9 generates an electric signal S2 (in other words, a measured value) representing the intensity level of each wavelength for the incident light L2. Examples of the spectroscopic sensor 9 include a polychromator using a diffraction grating, a polychromator combining a continuous interference film filter and an SPD (silicon photodiode), and a tristimulus value type that measures colors by rotating three color filters. is there.

  The main body 3 includes a signal processing unit 11, a signal processing unit 12, an AD conversion unit 13, an AD conversion unit 14, a control processing unit 15, an input unit 16, and an output unit 17.

  The signal processing unit 11 is an analog circuit that performs predetermined processing on the electrical signal (measured value) S <b> 1 output from the two-dimensional image sensor 8. The signal processing unit 12 is an analog circuit that performs predetermined processing on the electrical signal (measured value) S <b> 2 output from the spectroscopic sensor 9. These predetermined processes include a process of integrating the measurement values. The optical characteristic measuring apparatus 1 performs measurement a plurality of times and integrates the measured values in each measurement to reduce the error of the measured value.

  The electrical signal S1 processed by the signal processing unit 11 is converted from analog to digital electrical signal D1 by the AD conversion unit 13 and sent to the control processing unit 15. The electric signal S2 processed by the signal processing unit 12 is converted from analog to digital electric signal D2 by the AD conversion unit 14 and sent to the control processing unit 15.

  The control processing unit 15 is a microcomputer realized by a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and is calculated as a functional block as shown in FIG. A unit 21, a determination unit 22, a storage unit 23, and a color calibration unit 24. Details of these blocks will be described later.

  With reference to FIG. 1, the control processing unit 15 performs various settings, controls, and processes in the measurement of optical characteristics using the optical characteristic measuring apparatus 1. For example, the control processing unit 15 sets the exposure time and the number of integrations in the measurement using the two-dimensional image sensor 8 and the exposure time and the number of integrations in the measurement using the spectroscopic sensor 9.

  For example, the control processing unit 15 is disposed in the optical path of the light L1, and is disposed in the optical path of the first shutter (not shown) that causes the light L1 to enter or block the two-dimensional image sensor 8 and the light L2. Then, opening / closing of a second shutter (not shown) that causes the light L2 to enter or block the spectroscopic sensor 9 is controlled. The time when the first shutter is open is the exposure time of the two-dimensional image sensor 8, and the time when the second shutter is open is the exposure time of the spectral sensor 9.

  An electronic shutter may be used instead of the first and second shutters. That is, the control processing unit 15 electrically exposes a signal from the two-dimensional image sensor 8 and electrically exposes a signal from the first electronic shutter that shuts off the signal from the spectral sensor 9, and The operation of the second electronic shutter to be shut off is controlled.

  The control processing unit 15 controls the opening and closing of the first shutter so that the exposure time of the two-dimensional image sensor 8 set in the control processing unit 15 is reached, and the exposure of the spectral sensor 9 set in the control processing unit 15. The opening and closing of the second shutter is controlled so that time is reached. In addition, the control processing unit 15 controls the signal processing unit 11 so that the number of integrations of the two-dimensional image sensor 8 set in the control processing unit 15 is reached, and integration of the spectral sensor 9 set in the control processing unit 15. The signal processing unit 12 is controlled so as to be the number of times.

  The control processing unit 15 performs the following processing. The digital signal D1 is a signal that has been subjected to integration processing (processing for integrating measurement values) by the signal processing unit 11, and the color of each pixel for each pixel in the measurement region imaged (measured) by the two-dimensional image sensor 8. The tristimulus values R, G, and B are shown. FIG. 3 is a graph showing tristimulus values R, G, and B of a certain pixel. The horizontal axis indicates the wavelength, and the vertical axis indicates the relative sensitivity. The digital signal D <b> 2 is a signal that has been subjected to integration processing or the like by the signal processing unit 12, and represents the intensity level of each wavelength with respect to light from the spot area measured by the spectroscopic sensor 9. FIG. 4 is a graph showing color matching functions of the XYZ color system. This graph is stored in the control processing unit 15 in advance. In FIG. 4, the horizontal axis represents the wavelength, and the vertical axis represents the tristimulus value.

  The control processing unit 15 uses the digital signal D2 and the color matching function of the XYZ color system shown in FIG. 4 to obtain the true values of the tristimulus values X, Y, and Z indicating the color of the spot area measured by the spectroscopic sensor 9. calculate. Then, the control processing unit 15 uses the true values of the calculated tristimulus values X, Y, and Z to convert the tristimulus values R, G, and B indicating the color of each pixel into the tristimulus values X for the digital signal D1. , Y, Z are converted into true values. Thereby, the information indicating the color of each pixel in the measurement region can be changed from the tristimulus values R, G, and B to the true values of the tristimulus values X, Y, and Z.

  Through the processing described above, the color data of each pixel in the measurement region imaged by the two-dimensional image sensor 8 is calibrated to highly accurate color data. This processing is performed by the color proofing unit 24 shown in FIG. That is, the color calibration unit 24 calibrates the color data of each pixel in the two-dimensional area including the spot area, measured by the two-dimensional image sensor 8, using the color data of the spot area measured by the spectroscopic sensor 9. . A process similar to this process is described in detail in Patent Document 1 described above.

  The input unit 16 is a device for inputting commands (commands), data, and the like from the outside to the optical characteristic measuring device 1, and is, for example, a touch panel or a keyboard. Alternatively, the input unit 16 uses an interface unit (such as a USB terminal) for inputting commands, data, and the like set by an external controller (such as a personal computer) to the optical property measuring apparatus 1 according to the measurement object and measurement conditions. It may be a device. The output unit 17 is a device for outputting the command and data input from the input unit 16 and the calculation result of the control processing unit 15. For example, the output unit 17 is a display device such as an LCD (liquid crystal display) or an organic EL display. Or, for example, a printing apparatus such as a printer.

The measurement time of the measurement using the optical sensor such as the spectroscopic sensor 9 or the two-dimensional image sensor 8 is based on the exposure time in the measurement using the optical sensor and the integrated number of measurement values output from the optical sensor. Determined. In this embodiment, in order to simplify the determination of the measurement time, the measurement time is represented by the following formula (1).
Measurement time = exposure time x number of integrations (1)

  The measurer operates the input unit 16 (FIG. 1) to input the exposure time and the number of integrations to the optical characteristic measuring device 1 for each of the spectroscopic sensor 9 and the two-dimensional image sensor 8. These values are set for the optical characteristic measuring apparatus 1 and the optical characteristic measuring apparatus 1 performs measurement using the spectroscopic sensor 9 and measurement using the two-dimensional image sensor 8 with the setting. Since the spectroscopic sensor 9 and the two-dimensional image sensor 8 have different characteristics, the exposure time T1 and the number of integrations N1 in the measurement using the spectroscopic sensor 9 and the exposure time T2 and the integration in the measurement using the two-dimensional image sensor 8 are performed. The number of times N2 is input separately.

  FIG. 5 is a comparison diagram comparing the measurement time of measurement using the spectroscopic sensor 9 and the measurement time of measurement using the two-dimensional image sensor 8. Since the number of integrations in the measurement using the spectroscopic sensor 9 is N1, the number of measurements is N1. Since the number of integrations in the measurement using the two-dimensional image sensor 8 is N2, the number of measurements is N2.

  The reason why the spectroscopic sensor measurement time is longer than the two-dimensional image sensor measurement time is that the exposure time in the measurement using the spectroscopic sensor 9 is longer than the exposure time in the measurement using the two-dimensional image sensor 8. Since the spectroscopic sensor 9 divides the light L2 (FIG. 1) into many wavelength components, the amount of light of each component is relatively reduced. For this reason, the exposure time in the measurement using the spectroscopic sensor 9 becomes long.

  When the object to be measured has a low luminance, the exposure time becomes long, so that the difference between the exposure time in the measurement using the two-dimensional image sensor 8 and the exposure time in the measurement using the spectroscopic sensor 9 becomes large. The waiting time of the sensor 8 becomes longer. Thereby, the utilization efficiency of the two-dimensional image sensor 8 is deteriorated.

  Therefore, in the present embodiment and the modification described later, the determination unit 22 (FIG. 2) uses the measurement time (first measurement time) of the measurement using the spectroscopic sensor 9 (one optical sensor) and the two-dimensional image. In order to reduce or eliminate the difference from the measurement time (second measurement time) of measurement using the sensor 8 (the other optical sensor), the second measurement is performed if the first measurement time is long. If the first measurement time is short so that the time is long, at least one of the exposure time and the number of integrations in the measurement using the two-dimensional image sensor 8 is determined so that the second measurement time is short. That is, the second measurement time, which is the measurement time of the measurement using the other optical sensor, is determined based on the first measurement time, which is the measurement time of the measurement using one of the optical sensors.

  Of the two optical sensors, the optical sensor to be one of the optical sensors is determined in advance. If the measurer sets the exposure time and the number of integrations for each of the two optical sensors, the optical sensor that increases the measurement time becomes one of the optical sensors. This is known in advance from the characteristics of the two optical sensors. In the present embodiment, the spectroscopic sensor 9 is one optical sensor, and the two-dimensional image sensor 8 is the other optical sensor.

  In the present embodiment, the exposure time (first exposure time) and the number of integrations (first integration number) in the measurement using the spectroscopic sensor 9 and the exposure time (in the measurement using the two-dimensional image sensor 8) ( A process of setting the second exposure time) and the number of integrations (second integration number) in the control processing unit 15 will be described. FIG. 6 is a flowchart illustrating the process. FIG. 7 shows a measurement time (second measurement time) of measurement using the spectroscopic sensor 9 and a measurement time (first time of measurement using the two-dimensional image sensor 8) in the state in which step S8 of FIG. 6 has been set. It is a comparison figure which compares (measurement time).

  6 and 7, the measurer operates the input unit 16 (FIG. 1) to expose the exposure time T <b> 1 (first exposure time) and the integration number N <b> 1 (first exposure time) in the measurement using the spectroscopic sensor 9. The first integration count) and the exposure time T2 (second exposure time) in the measurement using the two-dimensional image sensor 8 are input to the optical property measuring apparatus 1 (step S1). Exposure time T1> exposure time T2. The number of integrations in the measurement using the two-dimensional image sensor 8 (second integration number) is defined as a variable integration number X.

  The calculation unit 21 (FIG. 2) calculates the measurement time of the measurement using the spectroscopic sensor 9 by using the exposure time T1 and the integration number N1 input to the input unit 16 (step S2). According to the above formula (1), the exposure time T1 × the number of integrations N1 is the measurement time for measurement using the spectroscopic sensor 9.

  The calculating unit 21 sets the variable integration count X to 2 (step S3), and calculates the measurement time of measurement using the two-dimensional image sensor 8 (step S4). According to the above formula (1), the exposure time T2 × the variable integration number X is the measurement time for the measurement using the two-dimensional image sensor 8. Here, the measurement time of the measurement using the two-dimensional image sensor 8 is the exposure time T2 × 2.

  The determination unit 22 determines whether or not the measurement time of the measurement using the two-dimensional image sensor 8 calculated in step S4 exceeds the measurement time of the measurement using the spectroscopic sensor 9 calculated in step S2. Judgment is made (step S5).

  When the determination unit 22 determines that the measurement time of the measurement using the two-dimensional image sensor 8 does not exceed the measurement time of the measurement using the spectroscopic sensor 9 (No in step S5), the determination unit 22 sets the variable integration count X to X = X + 1 is set (step S6), and the process returns to step S4. Here, X = 3, and the calculation unit 21 calculates the measurement time (= exposure time T2 × 3) of the measurement using the two-dimensional image sensor 8 (step S4).

  When the determination unit 22 determines that the measurement time of the measurement using the two-dimensional image sensor 8 exceeds the measurement time of the measurement using the spectroscopic sensor 9 (Yes in step S5), the variable integration at this time point The number obtained by reducing the number of times X by 1, that is, X−1 is determined as the number of times of integration N2 in the measurement using the two-dimensional image sensor 8 (step S7). As described above, in the determination unit 22, the measurement time (second measurement time) using the two-dimensional image sensor 8 does not exceed the measurement time (first measurement time) using the spectroscopic sensor 9. As described above, the number of times of accumulation (second number of times of accumulation) in the measurement using the two-dimensional image sensor 8 is determined.

  The control processing unit 15 sets the exposure time T1 and the number of integrations N1 input in step S1 as the exposure time and the number of integrations in the measurement using the spectroscopic sensor 9, and the exposure time T2 input in step S1, and The integration number N2 determined in step S7 is set as the exposure time and the integration number in the measurement using the two-dimensional image sensor 8 (step S8). As shown in FIG. 7, the measurement time of measurement using the two-dimensional image sensor 8 is close to the measurement time of measurement using the spectroscopic sensor 9.

  The optical property measuring apparatus 1 measures the optical property of the screen of the flat panel display 4 under the setting of step S8.

  The main effects of this embodiment will be described. In this embodiment, the measurer determines the exposure time T1 and the number of integrations N1 in the measurement using the spectroscopic sensor 9, and the exposure time T2 in the measurement using the two-dimensional image sensor 8 (step S1). Then, the determination unit 22 sets the two-dimensional image sensor so that the value that can be set as the measurement time of the measurement using the two-dimensional image sensor 8 is close to the measurement time of the measurement using the spectroscopic sensor 9. The number of times of integration N2 in the measurement using 8 is determined (step S7). Therefore, according to the present embodiment, the difference between the measurement time using the spectroscopic sensor 9 and the measurement time using the two-dimensional image sensor 8 can be reduced, so that the two-dimensional image sensor 8 and the spectroscopic sensor 9 can be used. When optical characteristics are measured by using the optical sensor, it is possible to prevent a long standby time from occurring in any of the optical sensors.

  The measurement time of the optical property measuring apparatus 1 is limited to the longer one of the measurement time using the spectroscopic sensor 9 and the measurement time using the two-dimensional image sensor 8. According to the present embodiment, the two-dimensional image sensor 8 with respect to the measurement time of the measurement using the spectroscopic sensor 9 calculated using the exposure time T1 and the integration number N1 input by the measurer (step S2). Since it is possible to prevent the measurement time of the measurement using the light from exceeding (Step S5, Step S7), it is possible to prevent the measurement time of the optical property measuring apparatus 1 from becoming long.

  In addition, according to the present embodiment, the determination unit 22 uses the spectroscopic sensor 9 among the values that can be set as the measurement time of the measurement using the two-dimensional image sensor 8 in steps S4, S5, and S6. A value closest to the measurement time of measurement can be set as the measurement time of measurement using the two-dimensional image sensor 8. Therefore, the measurement time using the two-dimensional image sensor 8 can be made as long as possible within a range not exceeding the measurement time using the spectroscopic sensor 9 (step S7). Thereby, since the number of integrations in the measurement using the two-dimensional image sensor 8 can be increased, the accuracy of the measurement using the two-dimensional image sensor 8 can be improved.

  In the optical sensors such as the two-dimensional image sensor 8 and the spectroscopic sensor 9, the generated noise is larger when the luminance of the measurement target is low than when the luminance is high. Further, in the apparatus for measuring optical characteristics using two optical sensors as in the present embodiment, noise is generated in each optical sensor, so that these noises are overlapped to increase the noise. For this reason, when the brightness | luminance of a measuring object is low, we are anxious about the fall of a measurement precision. According to this embodiment, since the number of integrations in the measurement using the two-dimensional image sensor 8 can be increased, the accuracy of the measurement using the two-dimensional image sensor 8 can be improved.

  According to the present embodiment, if the measurement time using the spectroscopic sensor 9 is the same as the measurement time using the two-dimensional image sensor 8 in step S5, No in step S5, step S6, step S4, Yes in step S5, step S7. Therefore, exposure times T1, T2 and integration times N1, N2 at which the measurement time using the spectroscopic sensor 9 and the measurement time using the two-dimensional image sensor 8 are the same are set in the control processing unit 15. (Step S8). This eliminates the difference between the measurement time of measurement using the spectroscopic sensor 9 and the measurement time of measurement using the two-dimensional image sensor 8, so that waiting time occurs in both the spectroscopic sensor 9 and the two-dimensional image sensor 8. Absent.

  As described above, according to the present embodiment, the measurement time of the measurement using the two-dimensional image sensor 8 can be made as long as possible, so that the accuracy of the measurement using the two-dimensional image sensor 8 can be improved. As a result, the repetition performance of the optical property measuring apparatus 1 can be improved. The repeatability is a variation in measured values when measured multiple times using the optical property measuring apparatus 1.

  In the present embodiment, there are Modification 1 and Modification 2. In the first modification, the measurer determines the exposure time and the number of integration in the measurement using the spectroscopic sensor 9, and the initial value and the number of integration in the exposure time in the measurement using the two-dimensional image sensor 8. The unit 22 (FIG. 2) determines the exposure time in the measurement using the two-dimensional image sensor 8. In the first modification, the exposure time is determined considering that the measurement target is the flat panel display 4 that operates at a predetermined refresh cycle.

  In the first modification, the exposure time (first exposure time) and the number of integrations (first integration number) in the measurement using the spectroscopic sensor 9 and the exposure time (in the measurement using the two-dimensional image sensor 8) ( A process of setting the second exposure time) and the number of integrations (second integration number) in the control processing unit 15 will be described. FIG. 8 is a flowchart for explaining the process. FIG. 9 shows a measurement time (second measurement time) using the spectroscopic sensor 9 and a measurement time (first measurement) using the two-dimensional image sensor 8 in the state where the input in step S11 of FIG. It is a comparison figure which compares (measurement time). FIG. 10 is a comparison diagram comparing the measurement time of the measurement using the spectroscopic sensor 9 with the measurement time of the measurement using the two-dimensional image sensor 8 in the state in which the setting in step S21 of FIG.

  Referring to FIG. 8, the measurer operates input unit 16 (FIG. 1) to perform exposure time T <b> 1 (first exposure time) and integration number N <b> 1 (first time) in measurement using spectral sensor 9. And the initial value of the exposure time T2 (second exposure time) and the number of times of integration N2 (second number of times of integration) in the measurement using the two-dimensional image sensor 8 are input to the optical characteristic measuring apparatus 1. (Step S11). It is assumed that the exposure time T1> the initial value of the exposure time T2.

  The input unit 16 accepts values that are integer multiples of the refresh period of the flat panel display 4 as initial values of the exposure time T1 and the exposure time T2.

  The calculation unit 21 (FIG. 2) calculates the measurement time of measurement using the spectroscopic sensor 9 (step S12). This is the same as step S2. Therefore, the exposure time T1 × the number of integrations N1 is the measurement time for measurement using the spectroscopic sensor 9. As shown in FIG. 9, the difference between the measurement time using the two-dimensional image sensor 8 and the measurement time using the spectroscopic sensor 9 is large.

  The calculating unit 21 sets the initial value magnification x of the exposure time T2 to 2 (step S13), and calculates the variable exposure time (step S14). Here, the initial value × 2 of the exposure time T2 is the variable exposure time. Since the initial value is an integral multiple of the refresh cycle, the variable exposure time is also an integral multiple of the refresh cycle. The variable exposure time is an exposure time that is a candidate for the exposure time T2. The initial value of the exposure time T2 × the magnification x is the variable exposure time.

  The calculation unit 21 calculates the measurement time by measurement using the two-dimensional image sensor 8 by using the variable exposure time calculated in step S14 and the integration number N2 input in step S1 (step S15). The determination unit 22 determines whether or not the measurement time of the measurement using the two-dimensional image sensor 8 calculated in step S15 exceeds the measurement time of the measurement using the spectroscopic sensor 9 calculated in step S12. Judgment is made (step S16).

  When the determination unit 22 determines that the measurement time of the measurement using the two-dimensional image sensor 8 does not exceed the measurement time of the measurement using the spectroscopic sensor 9 (No in Step S16), the magnification x is set to x = x + 1 is set (step S17), and the process returns to step S14. Here, x = 3, and the calculation unit 21 calculates a variable exposure time (= initial value of the exposure time T2 × 3) (step S14).

  When the determination unit 22 determines that the measurement time of the measurement using the two-dimensional image sensor 8 exceeds the measurement time of the measurement using the spectroscopic sensor 9 (Yes in step S16), the magnification x is set to x = x-1 (step S18). Thereby, the determination unit 22 does not allow the measurement time (second measurement time) of the measurement using the two-dimensional image sensor 8 to exceed the measurement time (first measurement time) of the measurement using the spectroscopic sensor 9. Furthermore, the exposure time in the measurement using the two-dimensional image sensor 8 can be determined.

  The determination unit 22 determines whether or not the variable exposure time (= initial value of the exposure time T2 × the magnification x determined in step S18) is shorter than the saturation exposure time stored in advance in the storage unit 23 (FIG. 2). Judgment is made (step S19). The saturation exposure time is an exposure time at which the output from the two-dimensional image sensor 8 is saturated.

  When the determination unit 22 determines that the variable exposure time is equal to or longer than the saturation exposure time (No in step S19), the determination unit 22 returns to step S18.

  When the determination unit 22 determines that the variable exposure time is shorter than the saturation exposure time (Yes in step S19), the determination unit 22 determines the variable exposure time as the exposure time T2 of the measurement using the two-dimensional image sensor 8 (step S20). ). Therefore, the determination unit 22 can determine the exposure time T2 from the variable exposure time that is a value obtained by multiplying the refresh cycle by an integer.

  The control processing unit 15 sets the exposure time T1 and the integration number N1 input in step S11 as the exposure time and the integration number in the measurement using the spectroscopic sensor 9, and the integration number N2 input in step S11, and The exposure time T2 determined in step S20 is set as the exposure time and the number of integrations in the measurement using the two-dimensional image sensor 8 (step S21). As shown in FIG. 10, the measurement time for measurement using the two-dimensional image sensor 8 is close to the measurement time for measurement using the spectroscopic sensor 9.

  The optical characteristic measuring apparatus 1 measures the optical characteristic of the screen of the flat panel display 4 under the setting of step S21.

  The main effect of the modification 1 is demonstrated. When the exposure time N1 and the exposure time N2 are not an integral multiple of the refresh cycle in the measurement of the screen of the flat panel display 4 operating at a predetermined refresh cycle (for example, measurement of chromaticity distribution), the exposure time N1 and the refresh cycle And the exposure time N2 and the refresh cycle do not match, so that the measurement accuracy is reduced. According to the second modification, a value indicating an integer multiple of the refresh period of the flat panel display 4 is input to the input unit 16 as the initial values of the exposure time T1 and the exposure time T2 (step S11). Then, an integral multiple of the initial value of the exposure time T2 is determined as the exposure time T2 (step S18, step S19, step S20). Therefore, since the exposure time T1 and the exposure time T2 can be made an integral multiple of the refresh cycle, it is possible to prevent a decrease in measurement accuracy.

  If the exposure time T2 exceeds the saturation exposure time, the measurement using the two-dimensional image sensor 8 cannot be performed accurately. According to the modified example 1, the determination unit 22 determines a value smaller than the saturation exposure time as the exposure time T2 (step S19, step S20), and thus can prevent the exposure time T2 from exceeding the saturation exposure time.

  According to the first modification, the determination unit 22 is closest to the saturation exposure time among the values that can be set as the exposure time T2 in the measurement using the two-dimensional image sensor 8 by step S18, step S19, and step S20. The value can be determined as the exposure time T2. Since the exposure time T2 in the measurement using the two-dimensional image sensor 8 can be made as long as possible, the measurement accuracy using the two-dimensional image sensor 8 can be improved.

  Modification 2 will be described. In the modified example 2, the measurer determines the exposure time and the number of integrations in the measurement using the spectroscopic sensor 9, and the determination unit 22 (FIG. 2) determines the exposure time and the measurement in the measurement using the two-dimensional image sensor 8. Determine the number of integrations.

  In the second modification, the exposure time (first exposure time) and the number of integrations (first integration number) in the measurement using the spectroscopic sensor 9, and the exposure time (in the measurement using the two-dimensional image sensor 8) ( A process of setting the second exposure time) and the number of integrations (second integration number) in the control processing unit 15 will be described. FIG. 11 is a flowchart for explaining the process.

  The measurer operates the input unit 16 (FIG. 1) to measure the optical characteristics of the exposure time T1 (first exposure time) and the integration number N1 (first integration number) in the measurement using the spectroscopic sensor 9. Input to the device 1 (step S31).

  In the present embodiment and Modification 1, the measurement time of measurement using the spectroscopic sensor 9 is calculated using an equation. In Modification 2, the measurement time of measurement using the spectroscopic sensor 9 is calculated using a graph. calculate. An example of this graph is shown in FIG. FIG. 12 is a graph showing the relationship between the exposure time T1, the number of times of integration N1, and the measurement time of measurement using the spectroscopic sensor 9. This graph is stored in advance in the storage unit 23 (FIG. 2). The horizontal axis of the graph is the exposure time T1. The vertical axis of the graph is the measurement time of measurement using the spectroscopic sensor 9. The relationship between the exposure time and the measurement time of the measurement using the spectroscopic sensor 9 is shown for each of the integration number N1, the case of 2, and the case of 3 times. In order to simplify FIG. 12, the cumulative number N1 is shown only up to three times, but a graph up to a number that can be set as the cumulative number N1 is stored in the storage unit 23.

  In addition to the exposure time T1 and the number of integrations N1, various processing times are considered in the measurement time of the measurement using the spectroscopic sensor 9. The various processing times are, for example, a time for converting a current, which is an electric signal output from the spectroscopic sensor 9, into a voltage, and a time required for switching the gain. By taking various processing times into account for the measurement time, the measurement time can be made more accurate.

  According to the graph shown in FIG. 12, if the combination of the exposure time T1 and the integration number N1 is determined, the measurement time for measurement using the spectroscopic sensor 9 can be determined (that is, the measurement time can be calculated). The calculation unit 21 (FIG. 2) calculates the measurement time corresponding to the combination of the exposure time T1 and the integration number N1 input in step S31 using the graph shown in FIG. 12 (step S32).

  The determination unit 22 uses the table shown in FIG. 13 and the measurement time calculated in step S32 (that is, the measurement time of measurement using the spectroscopic sensor 9) in the measurement using the two-dimensional image sensor 8. The exposure time N2 and the number of integration N2 are determined (step S33).

  FIG. 13 is a diagram showing an example of a table used for determining the exposure time N2 and the number of integration times T2 in the measurement using the two-dimensional image sensor 8. This table is stored in advance in the storage unit 23 (FIG. 2).

  In the table of FIG. 13, a plurality of measurement times for measurement using the spectroscopic sensor 9 are provided (for example, measurement times are provided in increments of 1 second). In the table, the exposure time and the number of integrations in the measurement using the two-dimensional image sensor 8 assigned to each of these measurement times are provided. These have the following relationship: The measurement time of measurement using the spectroscopic sensor 9 is m. Let t be the exposure time in measurement using the two-dimensional image sensor 8 assigned to the measurement time m, and n be the number of integrations. The measurement time of the measurement using the two-dimensional image sensor 8 under this condition does not exceed the measurement time m, and among the values that can be set as the measurement time of the measurement using the two-dimensional image sensor 8, the measurement time m The value closest to. Thus, the measurement time (second measurement time) using the two-dimensional image sensor 8 is within the range not exceeding the measurement time (first measurement time) using the spectroscopic sensor 9 as much as possible. Can be long. Therefore, since at least one of the exposure time and the number of integrations in the measurement using the two-dimensional image sensor 8 can be increased, the accuracy of the measurement using the two-dimensional image sensor 8 can be improved.

  From the table shown in FIG. 13, the determination unit 22 determines the combination of the exposure time and the number of integrations assigned to the measurement time calculated in step S32 (that is, the measurement time of measurement using the spectroscopic sensor 9). The exposure time T2 (second exposure time) and the integration number N2 (second integration number) in the measurement using the two-dimensional image sensor 8 are determined (step S33).

  The control processing unit 15 sets the exposure time T1 and the integration number N1 input in step S31 as the exposure time and the integration number in the measurement using the spectroscopic sensor 9, and the exposure time T2 and integration determined in step S33. The number of times N2 is set as the exposure time and the number of integrations in the measurement using the two-dimensional image sensor 8 (step S34). The optical characteristic measuring apparatus 1 measures the optical characteristic of the screen of the flat panel display 4 under the setting of step S34.

  According to the modified example 2, since the determination unit 22 determines the exposure time T2 and the number of integrations N2 in the measurement using the two-dimensional image sensor 8, the measurer performs exposure for the measurement using the two-dimensional image sensor 8. The time and effort for determining and inputting the number of times and the number of integrations can be saved.

  In the present embodiment, Modification 1 and Modification 2, the optical characteristic measurement apparatus 1 has been described by taking a two-dimensional colorimeter as an example. However, the present invention is not limited to this, and for example, a two-dimensional luminance meter is also used. Good. In the case of a two-dimensional luminance meter, the color filter 7 (FIG. 1) is not provided, and a luminance sensor is provided instead of the spectroscopic sensor 9 (FIG. 1).

(Summary of embodiment)
An optical property measurement apparatus according to a first aspect of an embodiment includes a first optical sensor having a two-dimensional region in a measurement object as a measurement range, and a spot region included in the two-dimensional region and narrower than the two-dimensional region. The first exposure time and the first integration number are input for the measurement using one of the second optical sensor and the first optical sensor and the second optical sensor. A first measurement time that is a measurement time of measurement using the one optical sensor using the input unit that is input, and the first exposure time and the first integration number input to the input unit. A first measurement time, and a second measurement time which is a measurement time of measurement using the other optical sensor of the first optical sensor and the second optical sensor. Reduce the difference or reduce the difference In Suyo, and a determination unit for determining at least one of the second exposure time and the second accumulation count for each measurement using an optical sensor of the other.

  If the determination unit determines at least one of the second exposure time and the second integration number so that the second measurement time can be a value close to the first measurement time among the values that can be set as the second measurement time, The difference between the first measurement time and the second measurement time can be reduced. If the determination unit determines at least one of the second exposure time and the second integration number so that the second measurement time is the same as the first measurement time, the first measurement time and the second measurement time The difference from the measurement time can be eliminated.

  Thus, according to the optical characteristic measurement apparatus according to the first aspect of the embodiment, the first measurement time that is the time required for the measurement using one optical sensor and the time required for the measurement using the other optical sensor. The difference from the second measurement time can be reduced, or the difference can be eliminated. Therefore, when measuring optical characteristics using two optical sensors, it is possible to prevent a long standby time from occurring in any of the optical sensors.

  The determination unit determines at least one of the second exposure time and the second integration number in the following three modes. For example, the determination unit determines the second integration number based on the first exposure time, the first integration number, and the second exposure time input to the input unit by the measurer. The determining unit determines the second exposure time based on the first exposure time, the first integration number, and the second integration number input to the input unit by the measurer. The determination unit determines both the second exposure time and the second integration number based on the first exposure time and the first integration number input to the input unit by the measurer.

  In the above configuration, the determination unit determines at least one of the second exposure time and the second integration number so that the second measurement time does not exceed the first measurement time.

  The measurement time of the optical property measuring apparatus is limited to the longer one of the first measurement time and the second measurement time. According to this configuration, the second measurement time is set to the first measurement time with respect to the first measurement time determined using the first exposure time and the first integration number input by the measurer. Since it can be made not to exceed, it can suppress that the measurement time of an optical characteristic measuring apparatus becomes long.

  In the above-described configuration, the determination unit includes the second exposure time and the second integration so as to be a value closest to the first measurement time among values that can be set as the second measurement time. Determine at least one of the times.

  According to this configuration, the second measurement time can be made as long as possible within a range not exceeding the first measurement time. Thereby, since at least one of the second exposure time and the second integration number can be increased, the accuracy of measurement using the other optical sensor can be improved.

  In the above configuration, the measurement object is a screen of a display operating at a predetermined refresh cycle, and the input unit receives an input of the first exposure time that is an integer multiple of the refresh cycle, and the determination The unit determines the second exposure time from variable exposure times indicating a value obtained by multiplying the refresh cycle by an integer.

  When measuring the screen of a display operating at a predetermined refresh cycle (for example, measuring the chromaticity distribution), if the exposure time is not an integral multiple of the refresh cycle, the exposure time does not match the refresh cycle, so the measurement accuracy can be improved. descend. According to this configuration, the first exposure time and the second exposure time can be made an integral multiple of the refresh cycle, so that it is possible to prevent a decrease in measurement accuracy.

  In the above configuration, a storage unit that stores in advance a saturation exposure time that is an exposure time at which an output from the other optical sensor is saturated, and the determination unit sets a value smaller than the saturation exposure time as the second exposure time. decide.

  When the second exposure time exceeds the saturation exposure time, measurement using the other optical sensor cannot be performed accurately. According to this configuration, it is possible to prevent the second exposure time from exceeding the saturation exposure time.

  The said structure WHEREIN: The said determination part determines the value nearest to the said saturation exposure time as said 2nd exposure time.

  According to this configuration, since the second exposure time can be made as long as possible, the accuracy of measurement using the second optical sensor can be improved.

  In the above configuration, the first optical sensor includes an RGB color filter and a two-dimensional image sensor that receives light through the RGB color filter, and the second optical sensor includes a spectral sensor.

  This configuration is an example of a combination of the first optical sensor and the second optical sensor.

  In the above configuration, the color data of each pixel of the two-dimensional region including the spot region, which is measured by the two-dimensional image sensor, is calibrated using the color data of the spot region measured by the spectroscopic sensor. A calibration unit is further provided.

  This configuration is an aspect in which the optical characteristic measuring device is a two-dimensional colorimeter.

  In the above-described configuration, a light splitting unit that splits the light from the measurement target into two parts is further provided, and the first optical sensor is disposed in the optical path of the one split light, and the second optical sensor The sensor is arranged in the optical path of the other divided light.

  According to this configuration, the light from the measurement target is sent to the first optical sensor and the second optical sensor using the light dividing unit.

  The setting method of the optical characteristic measuring device according to the second aspect of the embodiment includes a first optical sensor having a two-dimensional region in a measurement object as a measurement range, the two-dimensional region, and the two-dimensional region. A second optical sensor having a narrow spot area as a measurement range, and a method for setting an optical characteristic measurement apparatus, wherein one of the first optical sensor and the second optical sensor is used. The first exposure time and the first integration number, and the first exposure time and the first integration number input to the input step. A calculation step of calculating a first measurement time which is a measurement time of measurement using the optical sensor, the first measurement time, and the other of the first optical sensor and the second optical sensor. Use sensor The second exposure time and the second integration number in the measurement using the other optical sensor so as to reduce or eliminate the difference from the second measurement time which is the measurement time of the measurement. Determining step for determining at least one of the following.

  The setting method of the optical property measurement device according to the second aspect of the embodiment is the same as the optical property measurement device according to the first aspect of the embodiment, when measuring the optical property using two optical sensors, It is possible to prevent a long standby time from occurring in any of the optical sensors.

  This application is based on Japanese Patent Application No. 2015-123680 filed on June 19, 2015, the contents of which are included in the present application.

  In order to express the present invention, the present invention has been properly and fully described through the embodiments with reference to the drawings. However, those skilled in the art can easily change and / or improve the above-described embodiments. It should be recognized that this is possible. Therefore, unless the modifications or improvements implemented by those skilled in the art are at a level that departs from the scope of the claims recited in the claims, the modifications or improvements are not covered by the claims. To be construed as inclusive.

  ADVANTAGE OF THE INVENTION According to this invention, the setting method of an optical property measuring device and an optical property measuring device can be provided.

Claims (10)

A first optical sensor whose measurement range is a two-dimensional region in the measurement object;
A second optical sensor that is included in the two-dimensional region and has a narrower spot region than the two-dimensional region as a measurement range;
For the measurement using one of the first optical sensor and the second optical sensor, an input unit for inputting a first exposure time and a first integration number;
A calculation unit that calculates a first measurement time, which is a measurement time of measurement using the one optical sensor, using the first exposure time and the first integration number input to the input unit; ,
Reducing the difference between the first measurement time and the second measurement time which is the measurement time of the measurement using the other optical sensor of the first optical sensor and the second optical sensor, or An optical characteristic measurement apparatus comprising: a determination unit that determines at least one of a second exposure time and a second integration number in measurement using the other optical sensor so as to eliminate the difference.   2. The optical according to claim 1, wherein the determination unit determines at least one of the second exposure time and the second integration number so that the second measurement time does not exceed the first measurement time. Characteristic measuring device.   The determination unit is configured to set at least one of the second exposure time and the second integration number so as to be a value closest to the first measurement time among values that can be set as the second measurement time. The optical characteristic measuring apparatus according to claim 2, wherein the optical characteristic is determined. The measurement object is a screen of a display operating at a predetermined refresh cycle,
The input unit receives an input of the first exposure time which is an integral multiple of the refresh period;
The optical property measuring apparatus according to claim 1, wherein the determination unit determines the second exposure time from variable exposure times indicating a value obtained by multiplying the refresh cycle by an integer. A storage unit that stores in advance a saturation exposure time that is an exposure time at which the output from the other optical sensor is saturated;
The optical property measurement apparatus according to claim 4, wherein the determination unit determines a value smaller than the saturation exposure time as the second exposure time.   The optical property measuring apparatus according to claim 5, wherein the determination unit determines a value closest to the saturation exposure time as the second exposure time. The first optical sensor includes an RGB color filter, and a two-dimensional image sensor that receives light through the RGB color filter,
The optical characteristic measuring apparatus according to claim 1, wherein the second optical sensor includes a spectroscopic sensor.   A color calibrating unit that calibrates color data of each pixel of the two-dimensional area including the spot area, measured by the two-dimensional image sensor, using the color data of the spot area measured by the spectroscopic sensor; The optical property measuring device according to claim 7 provided. A light splitting unit that splits the light from the measurement object into two parts;
The first optical sensor is disposed in the optical path of the one of the two divided lights,
The optical characteristic measuring device according to any one of claims 1 to 8, wherein the second optical sensor is disposed in an optical path of the other light divided into two. A first optical sensor whose measurement range is a two-dimensional region in a measurement object; and a second optical sensor which is included in the two-dimensional region and has a spot region narrower than the two-dimensional region as a measurement range. A method for setting an optical characteristic measuring device,
An input step in which a first exposure time and a first integration number are input for measurement using one of the first optical sensor and the second optical sensor;
A calculation step of calculating a first measurement time, which is a measurement time of measurement using the one optical sensor, using the first exposure time and the first integration number input in the input step; ,
Reducing the difference between the first measurement time and the second measurement time which is the measurement time of the measurement using the other optical sensor of the first optical sensor and the second optical sensor, or A setting method for an optical characteristic measuring apparatus, comprising: a determining step for determining at least one of a second exposure time and a second integration number in measurement using the other optical sensor so as to eliminate the difference.

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