WO2024024714A1

WO2024024714A1 - Measurement range determining device, optical measuring device, optical measuring system, optical measuring method, display adjusting device and adjusting method, and program

Info

Publication number: WO2024024714A1
Application number: PCT/JP2023/026971
Authority: WO
Inventors: 知宏桐山; 崇慶岡田
Original assignee: コニカミノルタ株式会社
Priority date: 2022-07-29
Filing date: 2023-07-24
Publication date: 2024-02-01

Abstract

A measurement range determining device comprises a determining means (21) for determining a measurement range corresponding to a light emission state of a measurement target object (4), from among a plurality of measurement ranges of an optical measuring device (2) capable of measuring a parameter relating to the light emission state. The measurement range determining device is provided with a control means (205) for causing the optical measuring device (2) to execute preliminary measurement of the parameter prior to main measurement, in a measuring time that is shorter than a measuring time for the main measurement in each measurement range, and the determining means (21) determines the measurement range for the main measurement appropriate for the measurement target object (4) on the basis of the results of the preliminary measurement executed by the optical measuring device (2).

Description

Measurement range determination device, light measurement device, light measurement system, light measurement method, display adjustment device and adjustment method, and program

The present invention relates to a light measuring device capable of measuring the light emitting state of a measurement target such as display brightness and chromaticity in multiple measurement ranges, and a measuring range determining device and a light measuring device that determine a measurement range according to the light emitting state. , a light measurement system, a light measurement method, a display adjustment device, an adjustment method, and a program.

For example, in the manufacturing process of the display that is the object to be measured, the luminance, which is one of the parameters related to the display's light emitting state, is measured using a light measurement device such as a color analyzer, and the gamma adjustment of the display is performed based on the measured luminance. ing.

As such a light measurement device, one having a plurality of measurement ranges is known in order to perform optimal measurement according to the brightness value. In this optical measurement device, a measurement range that allows optimal measurement is automatically determined according to the luminance value. For example, in a case where there are three measurement ranges R1 (dark), R2 (middle), and R3 (bright), if the measurement results cannot be obtained optimally using the R1 measurement range, remeasure the measurement range using the R2 measurement range. . If the measurement cannot be performed optimally using the measurement range R2, the optimum measurement range is determined by re-measuring using the measurement range R3. The same holds true when moving from the R3 measurement range to the R2 and R1 measurement ranges. By determining the optimal measurement range in this way, the user can perform optimal measurement without specifying the measurement range according to the luminance value.

In recent years, in gamma adjustment of displays using optical measurement devices, the number of adjustment points has increased due to the improvement of display performance. It is necessary to repeatedly measure while switching. The process of determining the optimal measurement range is performed each time. For this reason, this gamma adjustment process has become a bottleneck in the display production process. In order to improve production efficiency, it is required to shorten the time spent on gamma adjustment (takt time).

Incidentally, Patent Document 1 discloses a technique of performing measurement based on required accuracy and approximate luminance, with the aim of widening the measurement luminance range and reducing the load on the optical measurement device.

WO2018/198674 publication

However, the technique described in Patent Document 1 aims to reduce the load placed on the optical measurement device. Therefore, even if the method is applied to gamma adjustment by switching the brightness many times and waiting for the switched brightness to stabilize, it is difficult to reduce the time required.

Such issues arise not only when adjusting gamma by measuring brightness, but also when measuring parameters such as chromaticity related to the light emitting state of the object to be measured by determining the optimal measurement range among multiple measurement ranges. The same thing occurs in .

An object of the present invention is to determine the measuring range according to the light emitting state from among a plurality of measurement ranges included in an optical measuring device capable of measuring parameters related to the light emitting state of an object to be measured. The purpose of the present invention is to provide a measurement range determining device, a light measurement device, a light measurement system, a light measurement method, a display adjustment device and adjustment method, and a program that can be shortened.

The above objective is achieved by the following means.
(1) A measurement range determining device comprising a determining means for determining a measurement range according to a light emitting state among a plurality of measurement ranges of an optical measuring device capable of measuring parameters related to a light emitting state of a measurement target,
Before the main measurement, comprising a control means for causing the optical measurement device to perform a preliminary measurement of the parameter in a measurement time shorter than the measurement time of the main measurement in each measurement range,
The determining means is a measurement range determining device that determines a measurement range for the main measurement that is suitable for the object to be measured based on the results of preliminary measurements performed by the optical measuring device.
(2) The measurement range determining device according to item 1, wherein the measurement time of the preliminary measurement is determined according to the frequency of the light emission drive signal of the measurement object.
(3) An optical measurement device comprising the measurement range determining device according to

item

1 or 2 above.
(4) The optical measuring device according to item 3, wherein the measurement time of the preliminary measurement is determined according to the frequency of the light emission drive signal of the measurement target.
(5) a light measuring device capable of measuring parameters related to the light emitting state of a measurement target in multiple measurement ranges;
A control means for causing the optical measurement device to perform a preliminary measurement of the measurement target in a measurement time shorter than the measurement time of the main measurement in each measurement range before the main measurement;
determining means for determining a measurement range for main measurement according to a light emission state based on the results of a preliminary measurement performed by the optical measurement device;
Optical measurement system with.
(6) The optical measurement system according to item 5, further comprising a gamma adjustment means for adjusting the gamma of the object to be measured based on the parameters measured by the main measurement.
(7) The optical measurement system according to item 5 or 6, wherein the measurement time of the preliminary measurement is determined according to the frequency of the light emission drive signal of the measurement object.
(8) An optical measuring device capable of measuring parameters related to the light emitting state of the measurement target in multiple measurement ranges is capable of measuring parameters related to the light emission state of the measurement target in a measurement time shorter than the measurement time of the main measurement in each measurement range. performing a preliminary measurement of the object;
a step of determining a measurement range for the main measurement according to the light emission state based on the results of the preliminary measurement;
a step of the optical measurement device performing the main measurement in the determined measurement range;
Light measurement methods including.
(9) The optical measurement method according to item 8, further comprising the step of adjusting the gamma of the measurement target based on the parameters measured by the optical measurement device.
(10) The optical measurement method according to item 8 or 9, wherein the measurement time of the preliminary measurement is determined according to the frequency of the light emission drive signal of the measurement object.
(11) Before the main measurement, the parameters related to the light emitting state of the measurement target can be measured using an optical measurement device that can measure the light emission state of the measurement target in multiple measurement ranges. performing a preliminary measurement of the object;
a step of determining a measurement range for main measurement according to the light emission state based on the results of the preliminary measurement;
A program that causes the measurement range determination device's computer to execute the following.
(12) The program according to item 11, which causes the computer to further execute the step of adjusting the gamma of the measurement target based on the parameters measured by the optical measurement device.
(13) The program according to item 11 or 12, wherein the measurement time of the preliminary measurement is determined according to the frequency of the light emission drive signal of the object to be measured.
(14) A display adjustment device that uses a light emitting part of a display as a measurement target and performs gamma adjustment of the display,
The optical measuring device according to the preceding section 3,
output means for a light emission drive signal that causes the display to display panel display information for the gamma adjustment;
Gamma adjustment control means that performs gamma adjustment based on parameters related to the light emission state of the display measured in the main measurement in the light measurement device;
gamma adjustment result notification means for notifying the display of the result of gamma adjustment by the gamma adjustment control means;
Display adjustment device with.
(15) A display adjustment method that uses a light emitting part of a display as a measurement target and performs gamma adjustment of the display, comprising:
outputting a light emission drive signal that causes the display to display panel display information for the gamma adjustment;
a gamma adjustment control step of performing gamma adjustment based on the parameters related to the light emission state of the display measured in the main measurement in the light measurement device according to item 3 above;
a gamma adjustment result notification step of notifying the display of the gamma adjustment result in the gamma adjustment control step;
Display adjustment method including.

According to the measurement range determination device, optical measurement device, optical measurement system, and optical measurement method according to the present invention, before the main measurement of parameters such as brightness related to the light emission state of a measurement target such as a display, The preliminary measurement is performed in a measurement time shorter than the measurement time of the main measurement. Based on the results of the preliminary measurement, a measurement range for the main measurement is determined according to the light emission state. Therefore, compared to the conventional case where the measurement range is determined during the main measurement, the time required to determine the measurement range can be shortened, and the overall processing time can be shortened.

It is particularly effective when gamma adjustment is performed on a measurement object that requires measurement at multiple points.

Furthermore, by determining the measurement time of the preliminary measurement according to the light emission drive frequency of the object to be measured, the measurement range can be determined with high accuracy.

Furthermore, according to the program according to the present invention, parameters related to the light emitting state of the object to be measured are sent to an optical measuring device capable of measuring the light emitting state in a plurality of measurement ranges from the measurement time of the main measurement in each measurement range before the main measurement. The computer of the measuring range determining device performs a step of performing a preliminary measurement of the object to be measured in a short measurement time, and a step of determining a measurement range for the main measurement according to the light emission state based on the result of the preliminary measurement. can be executed.

Further, according to the display adjustment device and adjustment method according to the present invention, gamma adjustment is performed based on parameters regarding the light emitting state of the display measured in the main measurement by the optical measurement device, and the result of the gamma adjustment is notified to the display. Can be done.

1 is a block diagram showing the overall configuration of an optical measurement system according to an embodiment of the present invention. FIG. 2 is a block diagram showing specific configurations of a light measurement device, a display inspection/adjustment device, and a display of the light measurement system shown in FIG. 1. FIG. (a) to (e) show various waveforms of drive signals for driving the display to emit light. FIG. 2 is an explanatory diagram of a conventional measurement range determination method. FIG. 3 is an explanatory diagram of a conventional measurement range determination method. FIG. 3 is an explanatory diagram of a conventional measurement range determination method. FIG. 3 is an explanatory diagram of a conventional measurement range determination method. FIG. 3 is an explanatory diagram of a measurement range determining method in an embodiment of the present invention. FIG. 3 is an explanatory diagram of a measurement range determining method according to the embodiment of the present invention. (A) to (D) are diagrams for explaining the relationship between the frequency (period) of the light emission drive signal of the display and the preliminary measurement time. It is a flowchart for explaining the conventional measurement range determination process. It is a flow chart for explaining measurement range decision processing concerning this embodiment. 13 is a flowchart for explaining the contents of the preliminary measurement process in step S12 of FIG. 12. FIG. 14 is a flowchart for explaining the details of the preliminary measurement brightness determination process in step S124 of FIG. 13. FIG. 3 is a flowchart for explaining the contents of gamma adjustment processing. 16 is a flowchart for explaining the content of the gamma adjustment execution process in step S23 of FIG. 15. FIG. 17 is a flowchart for explaining the content of the result determination process in step S238 of FIG. 16. FIG.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the overall configuration of an optical measurement system 1 according to an embodiment of the present invention. This light measurement system 1 includes a light measurement device 2 and a display inspection/adjustment device 3.

The light measurement device 2 is, for example, a device called a color analyzer, and can measure brightness, chromaticity, etc., which are parameters related to the light emission state of the object to be measured. In this embodiment, a case will be described in which the object to be measured is a display 4 including a plurality of light emitters such as LEDs, and the light measuring device 2 measures the brightness in order to perform gamma adjustment of the display 4.

Furthermore, in this embodiment, the optical measurement device 2 has a built-in measurement range determining section 21. The measurement range determining unit 21 determines a measurement range for the main measurement according to the light emitting state of the display 4 in a preliminary measurement performed prior to the main measurement. The determination process will be described later.

The display inspection/adjustment device 3 controls the light emitting state of the display 4 and performs gamma adjustment based on the results of brightness measurement by the light measurement device 2. The display inspection/adjustment device 3 includes a light emission drive signal output section 31 and a gamma (denoted as "γ" in the drawing) adjustment section 32.

The light emission drive signal output unit 31 outputs a pulsed light emission drive signal to the display 4 to drive the display 4 to emit light when the light measurement device 2 measures the brightness of the display 4 . Specifically, the frequency of the light emission drive signal generated by the light emission drive signal output section 31 (light emission drive frequency of the display 4), shape, etc. are matched with those planned by the manufacturer of the display 4, and the display 4 is adjusted. supply to.

The gamma adjustment unit 32 adjusts the gamma of the display 4 using a known method during the main measurement.

The display inspection/adjustment device 3 described above is composed of an information processing device such as a PLC (programmable logic controller) equipped with a CPU as a processor, a RAM as a memory, and a storage device such as a hard disk or SSD. The functions of the light emission drive signal output 31, the gamma adjustment section 32, etc. are executed by the CPU operating according to an operation program stored in the storage device and developed in the RAM.

FIG. 2 is a block diagram showing a specific configuration of the optical measurement device 2, display inspection/adjustment device 3, and display 4 of the optical measurement system 1 shown in FIG.

The optical measuring device 2 includes a communication section 201, an integrating means 202, an IV converting means 203, a light receiving section 204, and a control section 205.

The communication unit 201 is an interface that sends and receives data to and from the display inspection/gamma adjustment device 3. Integrating means 202 obtains a luminance value using an integral method. The IV conversion means 203 converts the light-receiving current into voltage. The light receiving unit 204 receives the light emitted from the display 4 using a light receiving sensor.

The control unit 205 controls the overall operation of the optical measurement device 2. An example of control is switching the measurement range and setting the measurement time in each measurement range so that brightness measurements can be performed by switching to multiple measurement ranges from low to high brightness areas in the main measurement and preliminary measurements described later. , set the measurement start timing, etc.

The control unit 205 also includes a measurement method switching unit 205a, a cycle acquisition unit 205b, a brightness estimation unit 205c, a measurement range switching unit 205d, a measurement time setting unit 205e, a calculation unit 205f, a storage unit 205g, a time measurement unit 205h, etc. There is.

The measurement method switching unit 205a switches the measurement method, such as whether to acquire the luminance value using the integral method or the sequential method.

The cycle acquisition unit 205b acquires the light emission drive cycle of the display 4. The brightness estimating unit 205c estimates the brightness based on the measurement time, the amount of received light, etc. in the preliminary measurement. The measurement range switching unit 205d switches between a plurality of preset measurement ranges.

The measurement time setting section 205e sets the measurement time. The calculation unit 205f corresponds to a CPU, which is a processor, and performs necessary calculations. The storage unit 205g stores various data including programs and measurement results necessary for the operation of the optical measuring device 2. The time measurement unit 205h measures the light reception time and the like.

The functions of the control unit 205 of the optical measurement device 2 are executed by the calculation unit 205f operating according to the operation program stored in the storage unit 205g. The measurement range determining section 21 shown in FIG. 1 is also configured as part of the functions of the control section 205.

On the other hand, the display inspection/adjustment device 3 includes a communication section 301, a display inspection adjustment pattern storage section 302, a display information transmission section 303, a gamma adjustment control section 304, a gamma adjustment mode/brightness/frequency switching section 305, It includes a display brightness stability determination section 306, a gamma adjustment allowable width storage section 307, a gamma adjustment result determination section 308, a gamma adjustment result notification section 309, a time measurement section 310, and the like.

The communication unit 301 functions as an interface that transmits and receives data to and from the optical measurement device 2.

The display inspection adjustment pattern storage unit 302 stores patterns of light emission drive signals for the display 4, and stores patterns for each customer. The pattern of the light emission drive signal also includes a relational expression (ideal curve) between the input signal (voltage value) to the display 4 and the output luminance. In the gamma adjustment process, the relationship between the output brightness and the input signal is reset so as to correct the difference between the output brightness and the ideal curve for the input voltage value.

The display information transmission unit 303 transmits information to be displayed on the display 4 to the display 4. The display inspection adjustment pattern storage section 302, display information transmission section 303, and the like constitute the light emission drive signal output section 31 shown in FIG.

The gamma adjustment control unit 304 controls gamma adjustment processing using the results of the main measurement after the measurement range in the preliminary measurement has been determined. The gamma adjustment mode/brightness/frequency switching unit 305 switches between the gamma adjustment mode, brightness, and frequency.

The display brightness stability determination unit 306 determines whether the brightness of the display 4 is stable during gamma adjustment, and gamma adjustment is performed in a stable state. The gamma adjustment allowable width storage unit 307 stores the gamma adjustment allowable width for each customer or for each type (product number, model number) of the display 4, for example.

The gamma adjustment result determination unit 308 determines the gamma adjustment result, and the gamma adjustment result notification unit 309 notifies the display 4 of the gamma adjustment result. The gamma adjustment result is the relationship (formula or lookup table, etc.) between the output brightness and the reset input signal, or the input signal (voltage value) and output to the display stored in the display inspection adjustment pattern storage unit 302. It is a correction coefficient etc. for the relational expression of brightness. The time measurement unit 310 measures time during gamma adjustment and the like.

The above-mentioned gamma adjustment control section 304, gamma adjustment mode/brightness/frequency switching section 305, display brightness stability determination section 306, gamma adjustment allowable width storage section 307, gamma adjustment result determination section 308, gamma adjustment result notification section 309, time measurement The gamma adjustment section 31 shown in FIG. 1 is configured by the section 310 and the like.

The display 4 includes a control section 41, a light emitting section 42, a drive frequency control section 43, a display information acquisition section 44, a gamma adjustment result storage section 45, and the like.

The control section 41 centrally controls the entire display 4, and the light emitting section 42 consists of light emitting elements such as LEDs. The drive frequency control section 43 drives and controls the light emitting section 2 so that it emits light at the light emission drive frequency output from the display inspection/adjustment device 3 .

The display information acquisition unit 44 acquires information to be displayed on the display 4 transmitted from the display information transmission unit 303 of the display inspection/adjustment device 3. The gamma adjustment result storage unit 45 stores the gamma adjustment result notified from the gamma adjustment result notification unit 309 of the display inspection/adjustment device 3.

FIGS. 3A to 3E show various waveform examples of drive signals for driving the display 4 to emit light. The horizontal axis of each waveform is time, and the vertical axis is intensity. The signal in figure (a) has a constant intensity, the signal in figure (b) has a different intensity repeated every frame (1 flame), and the signal in figure (c) has a pulse waveform with a large width. It is. The signal in (d) of the figure is a pulse waveform with a small width, and the signal in (e) of the figure is a waveform whose intensity gradually decreases from the beginning to the end of one frame.

In this embodiment, it is assumed that a light emission drive signal having a waveform shown in (c) or (d) of the same figure is used.

In this embodiment, the optical measurement device 2 is configured to measure brightness in four measurement ranges R1 to R4. The optical measurement device 2 determines an optimal measurement range in accordance with the light emission state (brightness value), and performs measurement by switching to the measurement range.

Table 1 shows an example of the measurement range (luminance range) in measurement ranges R1 to R4 and the time required to determine the measurement range.

Regarding determining the optimal measurement range, conventionally, the measurement ranges were sequentially switched until the optimal measurement range was reached in the main measurement. For this reason, it takes time to start measuring the four brightness levels of the display.

This conventional situation will be explained with reference to FIGS. 4 to 7. 4 and 5 are explanatory diagrams for high luminance measurement, and FIGS. 6 and 7 are explanatory diagrams for low luminance measurement. The white pulses at the top of each figure indicate the light emission drive signal, and the period of the light emission drive signal is 15 ms.

In Case 1 shown in FIG. 4, the luminance to be measured is 1000 nits, the light emission period is 15 ms, and the measurement period is 30 ms (for measurement ranges R2 to R4) to 60 ms (for measurement range R1). The first two cycles indicate a standby state, and the measurement range in the standby state is set as the previous measurement range.

The main measurement is started based on the measurement start instruction indicated by the arrow T1, but as shown in FIG. 4, if the previous measurement range was R4, the current measurement range is also R4.

The measurement range R4 has a brightness range of 400 nits or more, and the measurement target brightness is 1000 nits, so the measurement range R4 is the optimal measurement range. Therefore, an estimated luminance of 1000 nits is obtained in two cycles (30 ms) from the start of the main measurement, and the measurement range in the main measurement is determined to be R4. The brightness measurement result in this measurement is also 1000 nits. The time from the start of this measurement to the end indicated by arrow T2 is 30 ms.

However, as shown in Case 2 of FIG. 5, when the previous measurement range is R1, the main measurement is started in the measurement range R1. The luminance range of measurement range R1 is 10 nits or less, and the luminance to be measured is 1000 nits. Therefore, measurement range R1 is not the optimal measurement range, and an error occurs because the luminance cannot be estimated within the measurement time of 60 ms. (Indicated by N/A).

Assuming that the four measurement ranges are switched in the order of R1, R2, R3, and R4, the next measurement range R2 also has a brightness range of 10 to 100 nits, which is not the optimal measurement range, and the brightness is estimated within the measurement time of 30ms. Can not. Furthermore, the next measurement range R3 also has a luminance range of 100 to 400 nits, which is not the optimal measurement range, and the luminance cannot be estimated within the measurement time of 30 ms. Then, the measurement range is switched to the next measurement range R4, which becomes the optimum measurement range, and an estimated luminance of 1000 nits is obtained, and the measurement range for the main measurement is determined to be R4.

As shown in FIG. 5, when the measurement range at the start of the main measurement is R1, it takes 150 ms from the start to the end of the main measurement, which takes a long time.

Furthermore, in the measurement of low luminance where the measurement target luminance is 1 nit as shown in Case 3 in FIG. 6, if the previous measurement range is R1, the main measurement is started in the measurement range R1. The luminance range of the measurement range R1 is 10 nit or less, and the luminance to be measured is 1 nit, so the measurement range R1 is the optimal measurement range. Therefore, an estimated luminance of 1 nit is obtained in four cycles (60 ms) from the start of the main measurement, and the measurement range in the main measurement is determined to be R1. The time from start to end of this measurement is 60 ms.

However, as shown in Case 4 in FIG. 7, if the previous measurement range is R4, the main measurement is started in measurement range R4. Since the luminance range of the measurement range R4 is 400 nit or more and the luminance to be measured is 1 nit, the measurement range R4 is not the optimal measurement range, and the luminance cannot be estimated within the measurement time of 30 ms, resulting in an error.

Assuming that the four measurement ranges are switched in the order of R4, R3, R2, and R1, the next measurement range R3 also has a brightness range of 100 to 400 nits, which is not the optimal measurement range, and the brightness is estimated within the 30ms measurement time. Can not. Furthermore, the next measurement range R2 also has a luminance range of 10 to 100 nits, which is not the optimal measurement range, and the luminance cannot be estimated within the measurement time of 30 ms. Then, the measurement range is switched to the next measurement range R1, which becomes the optimum measurement range, and an estimated luminance of 1 nit is obtained, and the measurement range for the main measurement is determined to be R1.

As shown in FIG. 7, when the measurement range at the start of the main measurement was R4, it took 150 ms from the start to the end of the main measurement, which took a long time.

As explained in the examples of FIGS. 5 and 7, the time it takes to determine the optimal measurement range is rarely a problem in normal brightness measurements. However, in gamma adjustment, where the number of adjustment points has increased due to the improved performance of the display 4, it is necessary to repeatedly measure the display 4's light emission drive frequency, number of gamma modes, and number of gamma adjustment points while switching between low and high brightness. . Therefore, the long time required to determine the optimal measurement range leads to a decrease in efficiency due to the lengthening of the overall gamma adjustment time.

Therefore, in this embodiment, the optimal measurement range is determined early by performing preliminary measurement in a measurement time shorter than the measurement time of the main measurement in each measurement range.

In this embodiment, the preliminary measurement is configured to measure the brightness in four measurement ranges R1 to R4 like the main measurement, but the measurement time is set to half of the main measurement shown in Table 1. There is. Therefore, the measurement range in each range is also half of the actual measurement. Table 2 shows an example of the measurement range (luminance range) in the measurement ranges R1 to R4 of the preliminary measurement and the time required to determine the measurement range.

Case 5 in FIG. 8 shows a preliminary measurement method when the luminance of the measurement target is as high as 1000 nits. Luminance is estimated from preliminary measurements, regardless of the measurement range of the previous main measurement. For example, when measurement range R4 is first set, an estimated luminance of 500 nits can be obtained in 15 ms. Therefore, the optimum measurement range is determined to be R4, measurement range R4 is set, and the main measurement is performed in the next 30 ms. The time from the start of the preliminary measurement to the end of the main measurement was 45 ms.

Case 6 in FIG. 9 shows a preliminary measurement method when the luminance of the measurement target is as low as 1 nit. In the preliminary measurement, for example, when measurement range R4 is set first, only an estimated luminance of 200 nit or less can be obtained in 15 ms, so it is determined that measurement range R4 is not optimal, and it is switched to the next measurement range R3.

Even in measurement range R3, only an estimated luminance of 5 nit or less can be obtained in 15 ms. Therefore, it is determined that the optimum measurement range is R1, and the main measurement is performed with measurement range R1 set. Note that the optimum measurement range R1 may be determined after performing a preliminary measurement in the measurement range R2 after a preliminary measurement in the measurement range R3. The time from the start of the preliminary measurement to the end of the main measurement was 90 ms.

When the luminance to be measured is as high as 1000 nits and the preliminary measurement is switched from measurement range R1 to R2, R3, and R4, the time from the start of the preliminary measurement to the end of the main measurement is 90 ms.

From a comparison between the method of determining the optimal measurement range in the main measurement shown in Case 2 in Figure 5 and Case 4 in Figure 7, and the method of determining the optimal measurement range in the preliminary measurement shown in Case 6 in Figure 9. As can be understood, when the initially set measurement range is different from the optimal measurement range, it is better to determine the optimal measurement range by preliminary measurement with a measurement time shorter than the measurement time of the main measurement. The time required to complete the main measurement is shortened. Therefore, when there are many adjustment points such as gamma adjustment, by determining the optimal range through preliminary measurements, the overall processing time can be shortened and work efficiency can be improved.

Incidentally, in the above example, the preliminary measurement time was set to 30 ms in the measurement range R1 and 15 ms in the measurement ranges R2 to R4. The shorter the preliminary measurement time, the shorter the time required to determine the optimal range.

However, if the preliminary measurement time is shorter than the period of the frequency of the light emission drive signal of the display 4, the preliminary measurement time will be shortened, but the accuracy will be reduced. Conversely, if the preliminary measurement time is longer than the period of the frequency of the light emission drive signal of the display 4, the preliminary measurement time will be longer and the accuracy will also be lowered. Therefore, the preliminary measurement time is preferably determined according to the frequency of the light emission drive signal of the display 4. Specifically, in order to reduce the preliminary measurement time and maintain accuracy, it is preferable to synchronize with the cycle of the frequency of the light emission drive signal, that is, set the time length to be the same as the cycle.

This point will be explained with reference to FIG. FIG. 10(A) is a diagram showing the output state of the light emission drive signal of the display 4, and the horizontal axis shows time. Moreover, the white part is the light emission drive signal, and T3 is the period (light emission period) of the light emission drive signal.

The figure (C) shows a case where the preliminary measurement time indicated by double hatching is shorter than the cycle of the light emission drive signal. In this case, the preliminary measurement time is short, but the light emission drive signal may not arrive within the preliminary measurement time and no light is emitted, resulting in a decrease in measurement accuracy.

The same figure (D) shows the case where the preliminary measurement time is longer than the cycle of the light emission drive signal. In this case, the light emission drive signal may arrive once or twice within the preliminary measurement time, and the measurement accuracy also decreases. Moreover, the preliminary measurement time becomes longer.

In the same figure (B), the preliminary measurement time is the same time length as the cycle of the light emission drive signal. In other words, it is synchronized with the cycle of the light emission drive signal. By synchronizing in this manner, one light emission drive signal always arrives within the preliminary measurement time, so it is possible to perform highly accurate and stable measurements. Moreover, the preliminary measurement time is also shorter than that shown in FIG. Therefore, by synchronizing the preliminary measurement time with the period of the light emission drive signal, it is possible to both shorten the preliminary measurement time and maintain accuracy. Note that in the case of low luminance, the preliminary measurement time may be set to a natural number multiple of 2 or more of the cycle of the light emission drive signal in order to ensure accuracy.

Next, measurement range determination processing in this embodiment will be explained in comparison with conventional determination processing.

First, conventional measurement range determination processing will be explained with reference to the flowchart of FIG. 11.

In step S01, it is determined whether there is an instruction to start measurement, and if there is no instruction (NO in step S01), the process waits until there is an instruction. If there is an instruction (YES in step S01), the previous measurement range is set in step S02, and then the main measurement is executed in step S03.

Next, in step S04, the measurement result is determined, and it is determined whether the determination result is OK, that is, whether the brightness could be measured within the measurement range. If the brightness cannot be measured (NG in step S05), the measurement range is switched in step S06, and then the process returns to step S03 to perform the main measurement. The measurement range is switched and the actual measurement is performed until the brightness determination result is OK. If the brightness can be measured (OK in step S05), the display inspection/adjustment device 3 is notified of the measurement result in step S07. Note that instead of notifying the measurement results each time, a plurality of measurement results may be saved and notified all at once at a predetermined timing.

FIG. 12 is a flowchart showing the measurement range determination process executed by the optical measurement device 2 in this embodiment. The processing in FIG. 12 is executed by the calculation unit (processor) 205f in the optical measuring device 2 operating according to an operation program stored in the storage unit 205g or the like.

In step S11, the process waits for an instruction to start measurement (NO in step S11), and when there is an instruction (YES in step S11), a preliminary measurement is performed in step S12. This preliminary measurement will be described later.

Next, in step S13, the measurement range determined in the preliminary measurement in step S12 is set and the main measurement is performed, and then, in step S14, the display inspection/adjustment device 3 is notified of the main measurement result.

The contents of the preliminary measurement process in step S12 will be explained with reference to the flowchart in FIG.

In step S121, a sampling period (measurement time) for preliminary measurement is set. In this embodiment, the sampling period is, for example, 15 ms.

Next, in step S122, a measurement range that is high brightness and does not saturate is set. For example, in this embodiment, R4, which is the measurement range with the highest measurement brightness, is set. After measuring the brightness in step S123, a process for determining the preliminarily measured brightness is performed in step S124. This processing will also be described later.

Next, in step S125, it is determined whether the determination has been completed, and if it has not been completed (NO in step S125), the measurement range is switched in step S126, and the process returns to step S123 to perform preliminary measurement again. If the determination is completed in step S125, the process proceeds to step S127, where the measurement range for the main measurement is determined, and then the preliminary measurement process is ended and the process returns to the flowchart of FIG. 12.

The details of the preliminary measurement brightness determination process in step S124 will be explained with reference to the flowchart in FIG.

In step S1241, preliminary measurement conditions are acquired. The preliminary measurement conditions are the sampling period set in step S121 of FIG. 13 and the current measurement range set in step S122 or switched in step S126.

Next, in step S1242, after estimating the original brightness from the AD value (a value obtained by digitally converting the analog value obtained by the light receiving section), which is the measured value obtained under the preliminary measurement conditions, the brightness determination process for the preliminary measurement is performed. The process ends and returns to the flowchart of FIG. If the brightness can be estimated, in step S127 of FIG. 13, a measurement range suitable for the brightness is determined as the measurement range for the main measurement. If the brightness cannot be estimated, the measurement range is switched in step S126 of FIG. 13 and preliminary measurements are repeated until the brightness can be estimated.

Next, the gamma adjustment process performed by the display inspection/adjustment device 3 will be explained with reference to the flowchart of FIG. 15.

After determining the drive refresh rate of the display (also referred to as panel) to be gamma adjusted in step S21, the drive refresh rate is selected in step S22, and gamma adjustment is performed in step S23. The gamma adjustment execution process will be described later.

Next, in step S24, it is determined whether gamma adjustment has been completed for all drive frequencies. If the process has not been completed (NO in step S24), the process returns to step S22, selects another drive refresh rate, and then repeats steps S22 to S24. If gamma adjustment is completed for all drive frequencies (YES in step S24), the gamma adjustment process is ended.

The contents of the gamma adjustment execution process in step S23 will be explained with reference to the flowchart of FIG. 16.

In step S231, wait for an instruction to start gamma adjustment (NO in step S231), and if there is a start instruction (YES in step S231), determine the gamma adjustment mode in step S232, and then determine the gradation to be adjusted in step S233. do. Next, in step S234, the output value of the panel is determined, and then, in step S235, it is determined whether the panel display has become stable. If it is not stable (NO in step S235), wait until it is stabilized. When it is stabilized (YES in step S235), a measurement start instruction is given to the optical measuring device 2 in step S236, and in step S237 it is determined whether the measurement result has been received from the optical measuring device 2. If it is not received (NO in step S237), it waits until it is received, and if it is received (YES in step S237), a result determination process is performed in step S238. The result determination process will be described later.

Next, in step S239, it is checked whether the result is within an acceptable range. If it is not within the allowable range (NO in step S239), it is determined in step S240 whether the measurement has been repeated up to a preset upper limit. If the upper limit has not been reached (NO in step S240), the process returns to step S234 and the measurement is performed again. If the upper limit has been reached (YES at step S240), the adjustment cannot be completed, so it is determined that there is an abnormality at step S241, and the process returns to the flowchart of FIG. 15.

If the result is within the allowable range in step S239 (YES in step S239), the process advances to step S242, and it is checked whether gamma adjustment for all tones has been completed. If gamma adjustment for all tones has not been completed (NO in step S242), the process returns to step S233 to determine the next tones. That is, steps S233 to S242 are repeated.

When gamma adjustment for all tones is completed (YES in step S242), it is determined in step S243 whether adjustment in all gamma adjustment modes has been completed. If all have not been completed (NO in step S243), the process returns to step S232 to determine the next mode. That is, steps S232 to S243 are repeated. If all have been completed (YES in step S243), the process returns to the flowchart of FIG. 15.

As can be understood from this, it is necessary to adjust multiple tones for each gamma adjustment mode, and as the number of gamma adjustment modes for the display 4 increases these days, the number of repetitions of gamma adjustment becomes extremely large. , the gamma adjustment process takes time. Therefore, by performing preliminary measurements as in this embodiment, the time required to determine the optimal measurement range can be shortened, and the time required to complete gamma adjustment can be significantly shortened.

The result determination process in step S238 in FIG. 16 will be explained with reference to the flowchart in FIG. 17.

In step S2381, a target value of luminance and chromaticity is acquired, and in step S2382, an allowable range of luminance and chromaticity is acquired. Next, in step S2383, the measurement results are obtained, and in step S2384, it is determined whether the measurement results, luminance (Lv) and chromaticity (x, y), are within the allowable range with respect to the target values. Return to the flowchart in step 16.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

For example, a case has been described in which the optical measurement device 2 determines the measurement range through preliminary measurements, but the measurement range is determined through preliminary measurements by the display inspection/adjustment device 3 after receiving measurement data from the optical measurement device 2. Alternatively, another external device different from the display inspection/adjustment device 3 may perform the inspection.

Furthermore, although the display inspection/adjustment device 3 performs gamma adjustment, the optical measurement device 2 may have a built-in gamma adjustment function.

This application claims priority to Japanese Patent Application No. 2022-121738 filed on July 29, 2022, and the disclosure thereof constitutes a part of this application as is. .

INDUSTRIAL APPLICABILITY The present invention can be used as a measurement range determining device that determines the measurement range according to the light emission state of a light measurement device that can measure the light emission state of an object to be measured, such as display brightness and chromaticity, in multiple measurement ranges. It is.

1 Optical measurement system 2 Optical measurement device 21 Measurement range determination section 3 Display inspection/adjustment device 31 Pulse generation section 32 Gamma adjustment section 4 Display (measurement object)
201 Communication section 204 Light receiving section 205 Control section 205c Brightness estimation section 205d Estimated range switching section 205e Measurement time setting section

205f Calculation section

205g Storage section 301 Communication section 304 Gamma adjustment control section

Claims

A measurement range determining device comprising a determining means for determining a measurement range according to a light emission state among a plurality of measurement ranges of an optical measurement device capable of measuring parameters related to a light emission state of a measurement target,
Before the main measurement, comprising a control means for causing the optical measurement device to perform a preliminary measurement of the parameter in a measurement time shorter than the measurement time of the main measurement in each measurement range,
The determining means is a measurement range determining device that determines a measurement range for the main measurement that is suitable for the object to be measured based on the results of preliminary measurements performed by the optical measuring device.
The measurement range determining device according to claim 1, wherein the measurement time of the preliminary measurement is determined according to the frequency of a light emission drive signal of the object to be measured.
An optical measurement device comprising the measurement range determining device according to claim 1 or 2.
The optical measurement device according to claim 3, wherein the measurement time of the preliminary measurement is determined according to the frequency of a light emission drive signal of the measurement target.
A light measuring device capable of measuring parameters related to the light emitting state of a measurement target in multiple measurement ranges;
A control means for causing the optical measurement device to perform a preliminary measurement of the measurement target in a measurement time shorter than the measurement time of the main measurement in each measurement range before the main measurement;
determining means for determining a measurement range for main measurement according to a light emission state based on the results of a preliminary measurement performed by the optical measurement device;
Optical measurement system with.
The optical measurement system according to claim 5, further comprising gamma adjustment means for adjusting the gamma of the object to be measured based on the parameters measured by the main measurement.
The optical measurement system according to claim 5 or 6, wherein the measurement time of the preliminary measurement is determined according to the frequency of the light emission drive signal of the measurement target.
An optical measurement device that can measure parameters related to the light emitting state of a measurement target in multiple measurement ranges can perform a preliminary measurement of the measurement target in a measurement time shorter than the measurement time of the main measurement in each measurement range before the actual measurement. performing a measurement;
a step of determining a measurement range for the main measurement according to the light emission state based on the results of the preliminary measurement;
a step of the optical measurement device performing the main measurement in the determined measurement range;
Light measurement methods including.
The light measurement method according to claim 8, further comprising the step of adjusting the gamma of the measurement target based on the parameters measured by the light measurement device.
The optical measurement method according to claim 8 or 9, wherein the measurement time of the preliminary measurement is determined according to the frequency of a light emission drive signal of the measurement target.
Before the main measurement, the parameters related to the light emission state of the measurement target can be measured using an optical measurement device that can measure the light emission state of the measurement target in multiple measurement ranges. a step of performing the measurement;
a step of determining a measurement range for the main measurement according to the light emission state based on the results of the preliminary measurement;
A program that causes the measurement range determination device's computer to execute the following.
12. The program according to claim 11, which causes the computer to further execute the step of adjusting the gamma of the object to be measured based on the parameters measured by the optical measurement device.
The program according to claim 11 or 12, wherein the measurement time of the preliminary measurement is determined according to the frequency of a light emission drive signal of the measurement target.
A display adjustment device that uses a light emitting part of a display as a measurement object and performs gamma adjustment of the display,
The optical measuring device according to claim 3;
output means for a light emission drive signal that causes the display to display panel display information for the gamma adjustment;
Gamma adjustment control means that performs gamma adjustment based on parameters related to the light emission state of the display measured in the main measurement in the light measurement device;
gamma adjustment result notification means for notifying the display of the result of gamma adjustment by the gamma adjustment control means;
Display adjustment device with.
A display adjustment method that uses a light emitting part of a display as a measurement target and performs gamma adjustment of the display, the method comprising:
outputting a light emission drive signal that causes the display to display panel display information for the gamma adjustment;
A gamma adjustment control step of performing gamma adjustment based on parameters related to the light emission state of the display measured in the main measurement in the light measurement device according to claim 3;
a gamma adjustment result notification step of notifying the display of the result of the gamma adjustment performed by the gamma adjustment control step;
Display adjustment method including.