JP2018056717A - Determination device, method for controlling the same, and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically and quantitatively determine the effect of the response speed correction function of a liquid crystal by using a photosensor requiring a measurement time of one frame time or more.SOLUTION: A determination device includes correction means for performing correction control for correcting the response speed of a display panel, measurement means for measuring luminance in the predetermined measurement area of the display panel, display control means for displaying an image for measurement which is a moving image in the measurement area, and determination means for determining the effect of the correction control on the basis of a measurement value by the time integration of the luminance for a plurality of frames by the measurement means. The determination means determines the effect of the correction control on the basis of a first measurement value by the measurement means when the correction control is validated and the image for measurement is displayed and a second measurement value by the measurement means when the correction control is invalidated and the image for measurement is displayed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a determination device, a control method thereof, and a display device.

  In medical displays that display radiographic images, particularly displays for mammography, it is required by laws and guidelines of academic societies to perform advanced quality control. In order to cope with this, there is a display that strictly controls quality by providing a sensor for receiving luminance on the front surface of the display, for example, and periodically inspecting gradation characteristics automatically.

  On the other hand, tomosynthesis technology that enables stereoscopic display by capturing radiographic images such as mammography from multiple angles, reconstructing the captured images, and displaying them continuously like a moving image is known. Yes. The tomosynthesis image is one of the moving images, but since it is used for screening for breast cancer or the like, it is required to display an accurate image for each frame. For this reason, when displaying on a liquid crystal display, the response speed of the liquid crystal is required to be within one frame.

However, in a liquid crystal display, a response time of one frame or more is required for gradation transition between some frames in normal driving. As a technique for improving the response speed of the liquid crystal, for example, a response speed correction technique represented by overdrive has been proposed (for example, Patent Document 1).
Further, in order to manage the quality of the response speed correction function, a technique has been proposed in which a specific test image is displayed on a display and the response speed can be visually confirmed (for example, Patent Document 2).
Furthermore, a technique is disclosed in which the response time of the liquid crystal is measured from the front of the display using an optical sensor, the correction of the response speed is confirmed, and the overdrive correction amount is determined (for example, see Patent Document 3). .

Japanese Patent Laid-Open No. 1-10299 US Patent Application Publication No. 2013/0335382 JP 2010-008882 A

  However, in the techniques of Patent Documents 1 and 2, in order to perform quality control, the user needs to perform visual evaluation, and there is a problem that it is difficult for some people to confirm the difference. In addition, since it is necessary for humans to visually evaluate, it is necessary for the user to witness the periodic quality control, which is a burden on the user. In the technique of Patent Document 3, it is necessary to use an optical sensor whose measurement time is much shorter than one frame time (for example, about 1/100 or less of one frame time).

However, the above-described sensor for receiving the luminance provided on the front surface of the display has a long measurement time (integration time) so that the luminance of the display screen can be accurately measured. For example, it generally takes a measurement time of 2 frame times to about 1 second for white luminance and about several seconds to several tens of seconds for black luminance. When this optical sensor is used for a measurement time much shorter than one frame time, the S / N tends to decrease, and the degree of correction of the response speed at the time of low luminance or gradation transition in a dark part can be set. In some cases, measurement could not be performed correctly. For this reason, it is difficult to reduce the burden on the user by strictly inspecting not only the gradation characteristics but also the response speed regularly to perform quality control strictly and eliminate the need for the user to be present.

  Accordingly, an object of the present invention is to provide a technique capable of automatically and quantitatively determining the effect of the liquid crystal response speed correction function using an optical sensor that requires a measurement time of one frame time or more.

The present invention comprises a correction means for performing correction control for correcting the response speed of the display panel;
Measuring means for measuring luminance in a predetermined measurement area of the display panel;
Display control means for displaying a measurement image which is a moving image in the measurement region;
A determination unit for determining the effect of the correction control based on a measurement value obtained by time integration of luminance over a plurality of frames by the measurement unit;
With
The determination means includes
A first measurement value by the measurement means when displaying the measurement image with the correction control enabled; and
The determination apparatus is characterized in that the effect of the correction control is determined based on a second measurement value obtained by the measurement unit when the measurement image is displayed with the correction control disabled.

The present invention includes a correction step for performing correction control for correcting the response speed of the display panel;
A measurement step of measuring the luminance in a predetermined measurement area of the display panel;
A display control step of displaying a measurement image that is a moving image in the measurement region;
A determination step of determining the effect of the correction control based on a measurement value by time integration of luminance over a plurality of frames in the measurement step;
Have
In the determination step,
A first measurement value by the measurement step when the measurement image is displayed with the correction control enabled; and
It is a control method of the determination apparatus, wherein the effect of the correction control is determined based on the second measurement value in the measurement step when the measurement image is displayed with the correction control disabled.

  According to the present invention, it is possible to automatically and quantitatively determine the effect of the liquid crystal response speed correction function using an optical sensor that requires a measurement time of one frame time or more.

Functional block diagram of the determination apparatus of Embodiment 1 Example of test image of Example 1 Example of response waveform of liquid crystal Flowchart diagram of response speed correction function determination according to the first embodiment. Functional block diagram of the determination apparatus of Embodiment 2 Flowchart diagram of response speed correction function determination according to the second embodiment. Example of relationship between temperature and threshold coefficient K when determining response speed correction function of embodiment 2 Functional block diagram of display device of embodiment 3 Example of reference image and measurement image of Example 3 Example of transmittance transition, reference luminance, and response luminance in Example 3 Flowchart for measurement of response speed of embodiment 3 Functional block diagram of display device of embodiment 4 Example of reference image and embodiment 4 Example of measurement image of Example 4 Example of transmittance transition, reference luminance, and response luminance in Example 4 Flowchart for response speed measurement of Example 4

Example 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the first embodiment, a front sensor for measuring the luminance of light transmitted through a liquid crystal element is provided on the front surface of a liquid crystal panel, and a moving image measurement image (test chart) is displayed in a measurement region immediately below the front sensor. Is obtained as a measured value. It is determined whether or not the difference between the measured value when the response speed correction function of the liquid crystal is on and the measured value when it is off is equal to or greater than the theoretical difference, and the determination result is notified. As a result, it is possible to perform quantitative quality determination of the response speed correction function that always reduces the burden of visual confirmation by the user with the same quality standard.

  FIG. 1 is a functional block diagram of a display device having a determination device according to the first embodiment. 1 includes a liquid crystal panel 1, a backlight 2, an image input I / F unit 3, a user input I / F unit 4, a control unit 5, a pattern generation unit 6, a screen synthesis unit 7, and a response speed correction unit 8. , Front sensor 9, change amount management unit 10, quality management unit 11, and output I / F unit 12.

  The liquid crystal panel 1 includes a liquid crystal driver, a control board that controls the liquid crystal driver based on an input image signal, and a liquid crystal panel that displays an image by transmitting light from the backlight with a transmittance based on the image signal. Is done.

  The backlight module unit 2 includes a light source, a control circuit that controls the light source, and an optical unit for diffusing light from the light source. As the light source, an LED (Light Emitting Diode), a CCFL (Cold Cathode Fluorescent Lamp), or the like can be used.

  The image input I / F unit 3 is an interface for inputting an image signal to the display device. The image input I / F unit 3 is, for example, a display port, DVI, HDMI (registered trademark), or the like. In the first embodiment, it is assumed that an image signal of a medical image is input from an image signal source such as a workstation (not shown). Note that the present invention can be applied to a display device to which any image signal is input. The image input I / F unit 3 outputs the input image signal to the screen synthesis unit 7.

  The user input I / F unit 4 is an interface that accepts a user operation request, and outputs a user request to the control unit 5 in the subsequent stage. The user input I / F unit 4 includes a push button such as a menu installed on the front surface of the display device, a touch panel, and the like. The user can input an instruction to start determination of the response speed correction function of the liquid crystal to the display device via the user input I / F unit 4.

  The control unit 5 receives the request from the user input I / F unit 4 and performs control for determining the response speed correction function of the liquid crystal panel 1. Details of the determination method of the response speed correction function will be described later.

The pattern generation unit 6 generates a moving image measurement image to be displayed in a measurement region by the front sensor 9 in the liquid crystal panel 1. The pattern generation unit 6 receives an instruction from the control unit 5, generates a measurement image (test image) to be used for determination of the response speed correction function, and transmits it to the screen synthesis unit 7. As a test image, the moving image comprised from the image shown to FIG. 2 (A) and FIG. 2 (B) can be illustrated, for example. The test image is a moving image in which the images in FIGS. 2A and 2B are switched for each frame. The images in FIGS. 2A and 2B are images in which pixels with bright gradation values Lw and pixels with dark gradation values Lb are alternately arranged in the vertical direction and the horizontal direction. The difference between the image in FIG. 2A and the image in FIG. 2B is that the pixel having the gradation value Lw in the image in FIG. 2A is changed to the pixel having the gradation value Lb in the image in FIG. Become. A pixel having a gradation value Lb in the image of FIG. 2A is a pixel having a gradation value Lw in the image of FIG.
Note that the measurement image may be a moving image including the following first frame and second frame. The first frame includes a first gradation value pixel and a second gradation value pixel which are adjacent in at least one of the horizontal direction and the vertical direction. The second frame is a frame in which the positions of the pixels of the first gradation value and the pixels of the second gradation value in the first frame are exchanged.
In addition, although the moving image which repeated the change from the frame of a dark intermediate gradation (gray gradation) to the frame of a bright intermediate gradation (gray gradation) was illustrated as a test image, a test image is not restricted to this. For example, the first gradation value Lb and the second gradation value Lw may be changed for each color (R, G, B) constituting the pixel of the liquid crystal panel. In addition, it includes a pixel in which the gradation value of at least one of the colors (R, G, B) constituting the pixels of the liquid crystal panel repeats a change from the first gradation value to the second gradation value. The moving image to be used may be a test image. This test image is a moving image in which only one or two tone values are changed. Further, the first gradation value Lb and the second gradation value Lw may be determined in consideration of the gradation transition in which the effect of the response speed correction function is most likely to appear in accordance with the characteristics of the liquid crystal panel to be used. Alternatively, the first gray level value Lb and the second gray level value Lw may be determined by statistically analyzing the medical image and extracting the gray level that appears frequently.

  The screen composition unit 7 performs display control for displaying a moving image measurement image in a measurement region by the front sensor 9 in the liquid crystal panel 1. In response to an instruction from the control unit 5, the screen synthesis unit 7 generates image data of a test image generated by the pattern generation unit 6 from image data of a predetermined measurement region (a position immediately below the front sensor) for the input image. The image after replacement is output to the response speed correction unit 8 at the subsequent stage.

  The response speed correction unit 8 performs correction control for correcting the response speed of the liquid crystal panel 1. It is assumed that the second frame (current frame) is input following the first frame (past frame). The response speed correction unit 8 can change the transmittance of each pixel of the liquid crystal to the transmittance corresponding to the image data of the second frame within a predetermined time (one frame in the first embodiment) from the input of the second frame. The image data of the second frame is corrected. In the correction method, for example, the gradation of the first frame is compared with the gradation of the second frame, and the gradation value of the second frame is corrected according to the comparison result. For example, when the gradation value of the second frame is larger than the gradation value of the first frame, the image data is added. Such response speed correction control is called overdrive. The technique for correcting the response speed of the liquid crystal is not limited to the overdrive described above. The response speed correction unit 8 outputs the corrected image data to the liquid crystal panel 1. The response speed correction unit 8 switches on (valid) or off (invalid) response speed correction control according to an instruction from the control unit 5.

  The front sensor 9 measures the luminance in a predetermined measurement area of the liquid crystal panel 1. The measurement area is an area immediately below the front sensor. The front sensor 9 receives an instruction including the measurement timing and measurement time from the control unit 5 and measures the time integration of the luminance of light emitted from the liquid crystal panel 1 immediately below the front sensor for a predetermined measurement time. The front sensor 9 transfers the measurement value to the change amount management unit 10 in response to a request from the change amount management unit 10.

The change amount management unit 10 receives an instruction from the control unit 5, requests the front sensor 9 to transmit a measurement value, and holds the measurement value received from the front sensor 9. The change amount management unit 10 includes a first measured value that is a measurement value by the front sensor 9 when the correction control of the response speed correction unit 8 is enabled, and a front surface when the correction control of the response speed correction unit 8 is disabled. Both the second measurement value that is a measurement value by the sensor 9 is held. Then, the difference is obtained and output to the control unit 5.

  The quality management unit 11 determines the effect of the correction control by the response speed correction unit 8 based on the measurement value obtained by the time integration of the luminance over a plurality of frames by the front sensor 9. The quality management unit 11 receives the difference between the measurement values calculated by the change amount management unit 10 from the control unit 5 and determines whether the correction control by the response speed correction unit 8 is operating properly. The quality management unit 11 outputs the determination result to the output I / F 12.

  The output I / F unit 12 is an interface that notifies the user of the determination result of the quality management unit 11. For example, when an LED lamp is provided on the exterior of the display device and it is determined that the response speed correction function is operating properly, the LED lamp is lit in blue, and it is determined that it is not operating properly Turns on the LED lamp in red. The determination result notification method is not limited to this example. For example, a configuration may be adopted in which a warning screen is displayed on the screen of the display device and the user is notified.

Next, the principle of response speed correction function determination and a detailed flowchart will be described.
When displaying an image that repeatedly transitions from a dark gradation to a bright gradation as shown in FIGS. 2A and 2B, the response speed correction is performed when the liquid crystal response speed correction function is enabled. The display brightness is higher than when the function is disabled. The principle will be described with reference to FIG.

  FIG. 3 shows the transition of the transmissivity of the liquid crystal of the pixel when the horizontal axis shows time, the vertical axis shows the transmissivity, and the brightness of the pixel changes from dark to bright to dark. The response transition A in FIG. 3 shows the transition of the transmittance of the liquid crystal when the response speed correction function is valid, and the response transition B shows the transition of the transmittance of the liquid crystal when the response speed correction function is invalid. As indicated by the response transition A, when the response speed correction function is effective, the transmittance can reach the target transmittance corresponding to the image data within one frame. On the other hand, when the response speed correction function is disabled, the transmittance cannot reach the target transmittance within one frame. Compared with the response transition A and the response transition B in FIG. 3, there is a difference in the amount of light transmitted through the liquid crystal by the area shown by the hatching in FIG. 3 in two frames. When the correction function is valid, the measured luminance is higher by this area than when the correction function is invalid. As shown in FIG. 2A and FIG. 2B, when bright pixels and dark pixels are alternately arranged and the gradation values are exchanged in units of frames, the pixel area is as large as the resolution of human eyes. , Lb and the average luminance corresponding to Lw appear uniform in the measurement region. As described above, when the response speed correction function is valid, the display brightness of bright pixels is higher than when the response speed correction function is invalid. Therefore, when the response speed correction function is valid (FIG. 2C), it looks brighter than when it is invalid (FIG. 2D).

  Based on this principle, in Example 1, in order to determine the effect of the response speed correction function, the difference between the measured values of the luminance when the response speed correction function is on and when the response speed correction function is off is obtained. And when the difference is more than a threshold value, it determines with the effect of a response speed correction function being normal (operating appropriately). The threshold value can be set based on the following two pieces of information. Information on the change in transmittance (response transition A in FIG. 3) when the measurement image is displayed on the display panel in which the response speed correction function is valid and the effect is normal, and the display panel in which the response speed correction function is invalid 3 is information on a change in transmittance (response transition B in FIG. 3) when a measurement image is displayed on the screen. The threshold value may be set by correcting the brightness difference value estimated based on the shaded area in FIG. 3 in consideration of individual differences of liquid crystal panels and measurement errors. The threshold value is the minimum value of the difference between the measured values of brightness when the correction function is enabled and disabled for multiple display devices whose response speed correction function is operating normally. You may decide based on.

A flowchart for determining the response speed correction function is shown in FIG. Hereinafter, each step shown in FIG. 4 will be described in detail.
In step S1, processing for displaying a test image for a predetermined time in a measurement area directly under the front sensor is performed. In step S <b> 1, the control unit 5 instructs the pattern generation unit 6 to display a predetermined test image in the measurement area directly under the front sensor. When the pattern generation unit 6 receives the instruction, the pattern generation unit 6 performs a process for displaying the test image in the measurement region directly under the front sensor. As the test image, the images of FIGS. 2A and 2B are repeatedly displayed in units of frames. The time for displaying the test image is set according to the length of the test image as a moving image.

  In step S2, the luminance (luminance value L1) of the measurement area when the test image is displayed when the response speed correction function is on is measured. In step S <b> 2, the control unit 5 instructs the front sensor 9 to output a luminance measurement value by integration over a predetermined time. Here, the measurement time is 1 second. The front sensor 9 measures the luminance L1 by time integration over a predetermined time. The time for which the front sensor 9 measures the integrated luminance may be set according to the length of the measurement image. For example, if the measurement image is a moving image of 2 frames, the measurement time can be 2 frames or more, and if the measurement image is a moving image of 1 second, the measurement time can be 1 second or more.

  In step S3, the process of storing the measured luminance L1 is now broken. In step S3, the change amount management unit 10 requests the front sensor 9 to output the measurement value L1 to the change amount management unit 10, and the change amount management unit 10 stores the measurement value L1 received from the front sensor 9. To do.

  In step S4, processing for turning off the response speed correction function is performed. In step S4, the control unit 5 instructs the response speed correction unit 8 to turn off the response speed correction.

  In step S5, the luminance (luminance value L2) of the measurement region when the test image is displayed when the response speed correction function is off is measured using the front sensor. In step S5, the same processing as in step S2 is performed.

  In step S6, the change amount management unit 10 receives the measurement value L2 from the front sensor 9, and calculates a difference ΔL (= L1−L2) from the stored measurement value L1.

  In step S <b> 7, the control unit 5 receives the difference ΔL calculated by the change amount management unit 10 and transfers it to the quality management unit 11. The quality management unit 11 compares the threshold value K stored in advance with the difference ΔL. If ΔL ≧ K, the process proceeds to step S8. If ΔL <K, the process proceeds to step S9.

  In step S8, the quality management unit 11 determines that the response speed correction function is operating properly. The quality management unit 11 has a case where the difference between the first measurement value of luminance when the correction control of the response speed correction unit 8 is enabled and the second measurement value of luminance when the correction control is disabled is equal to or greater than a threshold value. In addition, it is determined that the effect of the correction control is normal.

  In step S9, the quality management unit 11 determines that the response speed correction function is not operating properly. The quality management unit 11 has a difference between the first measurement value of the luminance when the correction control of the response speed correction unit 8 is enabled and the second measurement value of the luminance when the correction control is disabled is smaller than the threshold value. In addition, it is determined that the effect of the correction control is not normal.

  In step S10, in order to notify the user of the determination result determined by the quality management unit 11, the quality management unit 11 instructs the output I / F 12 to display the LED lamp according to the result. In the first embodiment, the quality management unit 11 turns on the LED lamp in blue when the effect of the response speed correction function is normal, and turns on the LED lamp in red when the effect is not normal.

  According to the first embodiment, it is possible to perform quality determination of a quantitative response speed correction function that always reduces the burden that the user visually confirms with the same quality standard.

(Example 2)
The response speed of the liquid crystal is low when the temperature of the liquid crystal is low, and is high when the temperature is high. For this reason, since the difference between the measured values of the brightness when the response speed correction function is turned on and off changes according to the temperature of the liquid crystal, it is desirable to adjust the threshold value K used in the response speed correction function determination according to the temperature. . Therefore, in the second embodiment, a temperature sensor is provided in the configuration of the display device shown in the first embodiment, and the threshold value K is adjusted according to the temperature. Thereby, even when the temperature changes, it is possible to appropriately execute the response speed correction function determination. Hereinafter, Example 2 will be described in detail.

  FIG. 5 is a functional block diagram of a display device having a determination device according to the second embodiment. In FIG. 5, the display device includes a liquid crystal panel 1, a backlight 2, an image input I / F unit 3, a user input I / F unit 4, a control unit 102, a pattern generation unit 6, a screen synthesis unit 7, and a response speed correction unit. 8 has. Further, it includes a front sensor 9, a change amount management unit 10, a quality management unit 11, an output I / F unit 12, and a temperature sensor function unit 101. Description of the functional units described in the first embodiment is omitted.

  The temperature sensor function unit 101 measures the surface temperature of the liquid crystal panel. The temperature sensor function unit 101 may directly measure the surface temperature of the liquid crystal panel using a sensor, or may be provided with a sensor that can detect the temperature of the backlight and the outside air temperature. The temperature may be estimated. The temperature sensor function unit 101 transmits information on the temperature of the liquid crystal panel thus acquired to the control unit 102. When a plurality of temperature sensors are arranged, it is desirable that at least one temperature sensor is in the vicinity of the front sensor that measures luminance.

  The control unit 102 executes response speed correction function determination reflecting the temperature measurement result acquired from the temperature sensor function unit 101. A detailed flowchart is shown in FIG. In FIG. 6, the description of the same processing as the step described in the first embodiment is omitted.

  In step S201, a process for acquiring a measured value of temperature is performed. In this step, the temperature sensor function unit 101 outputs a temperature value measured after receiving a request from the control unit 102 to the control unit 102.

  In step S202, the threshold value K used in step S7 is set to a value corresponding to the temperature of the liquid crystal panel 1 acquired from the temperature sensor function unit 101. In the second embodiment, in this step, the control unit 102 obtains a corrected K value from the temperature sensor value using a look-up table. When the temperature increases, the response speed of the liquid crystal increases. Conversely, when the temperature decreases, the response speed decreases. From the waveform of the response transition in FIG. 3, when the temperature is high, the maximum value of the transmittance of the response transition B becomes large, so that the waveforms of the response transition A and the response transition B become close. Therefore, the integrated area indicated by the hatched portion in FIG. On the contrary, when the temperature is lowered and the response speed is lowered, the height of the maximum value of the transmittance of the response transition B is lowered, so that the integrated area indicated by the oblique lines in FIG. 3 is increased. Therefore, the threshold value K increases. Therefore, the relationship between the temperature value and the threshold value K is as shown in FIG. FIG. 7 shows temperature values on the horizontal axis and K values on the vertical axis. As the temperature value of the display device decreases, the speed of the liquid crystal decreases, and thus the threshold value K increases. On the other hand, when the temperature rises, the response speed of the liquid crystal increases and the threshold value decreases. Thus, the threshold value is set to a smaller value as the temperature of the liquid crystal panel 1 acquired from the temperature sensor function unit 101 is higher. Note that the curve in FIG. 7 is an example, and may be determined according to the relationship between the temperature of the liquid crystal device and the response speed.

Thus, the temperature sensor function unit is provided, and the determination threshold value K is adjusted according to the temperature. Thereby, even when the temperature changes, it is possible to appropriately execute the response speed correction function determination.
In the second embodiment, the response speed correction function is not adjusted by temperature. However, the response speed correction function may be adjusted according to the temperature. That is, the intensity of the correction control by the response speed correction unit 8 may be adjusted according to the temperature of the liquid crystal panel 1 acquired from the temperature sensor function unit 101. In this case, the threshold value K table is also changed according to the response speed correction adjustment. That is, the threshold value may be set to a value corresponding to the temperature of the liquid crystal panel 1 acquired from the temperature sensor function unit 101 and the intensity of correction control by the response speed correction unit 8.

(Example 3)
In Example 3 of the present invention, the front brightness sensor capable of measuring the brightness value of the light output from the display screen, the response speed measurement method using the integrated brightness when the moving image test image is displayed, and The response speed correction method using the measurement result will be described below.

FIG. 8 is a functional block diagram of a display device having a liquid crystal panel in the third embodiment.
8 includes a liquid crystal panel 1, a backlight 2, an image input I / F unit 3, a user input I / F unit 4, a control unit 5, a pattern generation unit 6, a screen synthesis unit 7, and a response speed correction unit 8. , Front sensor 9 and change amount management unit 10. The description of the same function described in the first embodiment is omitted.

  In response to a request from the user input I / F unit 4, the control unit 5 measures the response speed of the liquid crystal panel 1 and periodically performs correction control of the response speed correction function.

When the pattern generation unit 6 receives an instruction from the control unit 5 and measures the response speed, the pattern generation unit 6 generates moving image data that is n times the frame period of the liquid crystal panel 1 and sends the image data to the screen synthesis unit 7. Send.
As the image data in the third embodiment, a reference image for measuring the reference luminance or a test image for measuring the response luminance is generated according to an instruction from the control unit 5. The reference image may be used by inputting test image data generated by another signal source from the image input I / F unit 3.

The reference image is configured to include pixels in which the gradation value of at least one of the colors constituting the pixels of the liquid crystal panel 1 repeats a change from the first gradation value to the second gradation value, and the repetition frequency Is a second measurement image which is smaller than a test image described later. For example, using a moving image-like image data group shown in FIG. 9A, bright image data Lw and dark image data Lb are arranged for each pixel, and Lw and Lb are switched in units of three frames.
The pixels of the Lw data in the first frame are also Lw in the second to third frames, and Lb in the fourth to sixth frames.
In the first frame, the Lb data pixel is Lb in the second to third frames, and Lw in the fourth to sixth frames.
In FIG. 9, checker-like image data consisting of 1 × 1 in which Lw and Lb are arranged every other pixel is used, but checker-like image data consisting of 2 × 2 and raster image data consisting of the same gradation on the entire screen. Also good.

The test image includes a pixel in which the gradation value of at least one of the colors constituting the pixel of the liquid crystal panel 1 includes pixels that repeat the change from the first gradation value to the second gradation value. It is an image for. For example, using the moving image-like image data group shown in FIG. 9B, the bright image data Lw and the dark image data Lb are arranged for each pixel, and here, Lw and Lb are exchanged for each frame, and the number of transitions is Different.
The pixel of Lw data in the first frame is Lw in the third and fifth frames, and Lb in the second, fourth, and sixth frames.
The pixel of Lb data in the first frame is Lb in the third and fifth frames, and Lw in the second, fourth, and sixth frames.
Note that it is desirable that the reference image and the test image have the same number of frames and that the average image level (APL) between the six frames is the same. As described above, the reference image and the test image differ in the number of gradation transitions from the first gradation value to the second gradation value. Since the number of frames is the same, it can be said that the gradation transition frequency (frequency) is different.
Further, if it is not necessary to obtain the reference luminance used for calculating the response speed by measurement, the reference image need not be generated.

The screen synthesis unit 7 differs from the first embodiment in that the reference image or test image generated by the pattern generation unit 6 is synthesized.
In the third embodiment, the response speed is measured while the correction by the response speed correction unit 8 is on.

When the luminance sensor has a low S / N at low luminance or due to gradation transition in the dark part, the front sensor 9 sets a flag that prompts the user to change the time when acquiring the number of frames of the test pattern and the integrated luminance. It transmits to the control part 5.
Further, it is desirable that the measurement time is equal to the number of frames of the reference image and the test image. In the third embodiment, the measurement time is about 0.36 msec for a period of 6 frames.
However, if the correspondence relationship between the number of frames of the reference image and the test image and the measurement time is known, the measurement time and the number of frames of the test image may be changed to an integer multiple relationship depending on the display luminance and gradation data.

The change amount management unit 10 holds a measurement value (fourth measurement value) obtained by time integration of luminance by the front sensor 9 when the second measurement image (reference image) is displayed as the reference luminance. The change amount management unit 10 holds a measured value (third measured value) obtained by time integration of luminance by the front sensor 9 when the first measurement image (test image) is displayed as response luminance.
Further, the ratio is obtained from both the luminance of the reference luminance that is the integral luminance at the time of displaying the reference image and the response luminance that is the integral luminance at the time of displaying the test image, and the ratio is output to the control unit 5.

FIG. 10 shows the relationship between the transition of liquid crystal transmittance, the reference luminance obtained from the integrated luminance of the front sensor and the integrated luminance, and the response luminance. Specifically, the horizontal axis shows time, the vertical axis shows the transmittance of the liquid crystal, and when the brightness of the pixel changes from dark → bright → dark, the liquid crystal transmittance transition of the area displayed directly under the front sensor, The reference luminance and the response luminance obtained from the integrated luminance of the front sensor are shown as an example.
FIG. 10 is also a diagram illustrating the relationship between the reference luminance and the response luminance when the response speed correction is not properly performed and when the response speed correction is appropriately performed.

FIG. 10A shows an example of the relationship between the transmittance transition and the reference luminance, and the integrated luminance a obtained by integrating the transmittance transition a indicating the transmittance transition when the reference image is displayed for six frame periods becomes the reference luminance. .
Since the reference image used for measuring the reference luminance is a group of image data that has a lower transition frequency than the test image, it is not easily affected by a decrease in luminance or an increase in luminance due to a response delay of the liquid crystal. It is defined as luminance.
In the third embodiment, the image data group has a 6-frame period. However, when the image data group includes a low gradation, the integral luminance can be increased by increasing the image data group and the measurement period to, for example, 30 frames. Measurement accuracy may be maintained.

FIGS. 10B and 10C show an example of the relationship between the transmittance transition and the response luminance, and the integrated luminance obtained by integrating the transmittance transition indicating the transmittance transition when the test image is displayed for six frame periods. Response brightness.
FIG. 10B and FIG. 10C are diagrams showing the difference in response speed caused by the difference in liquid crystal temperature, and the test images and measurement conditions are the same.

FIG. 10B shows an example of the relationship between the transmittance transition b when the test image is displayed and the integrated luminance b that is the luminance obtained by integrating the transmittance transition b over a period of 6 frames. 1 is defined.
Since the response luminance 1 is 75% with respect to the reference luminance, it can be determined that there is a delay from the response speed of the reference liquid crystal.

FIG. 10C shows an example of the relationship between the transmittance transition c when the test image is displayed and the integrated luminance c, which is the luminance obtained by integrating the transmittance transition c over a period of 6 frames. 2 is defined.
Since the response brightness 2 is 100%, which is the same as the reference brightness, it can be determined that the response speed of the liquid crystal used as a reference is equivalent to the response speed of the liquid crystal when displaying a moving image.
As described above, in Example 3, a response is made based on the third measurement value (response luminance) that is a measurement value by the front sensor 9 when the first measurement image (test image) is displayed and the reference luminance. The effect of the correction control of the speed correction unit 8 is determined. Here, an example will be described in which the fourth measurement value, which is a measurement value by the front sensor 9 when the second measurement image (reference image) is displayed, is used as the reference luminance.

Next, a flowchart for measuring the response speed is shown in FIG.
Hereinafter, each step shown in FIG. 11 will be described in detail.

  In step S11, test image display conditions and measurement conditions are determined.

  In step S12, the reference luminance (L0) is acquired.

  In step S13, a test image for measuring response luminance is displayed for a predetermined time in an area directly under the front sensor. In step S13, the control unit 5 instructs the pattern generation unit 6 to display a predetermined test image in an area immediately below the front sensor for a predetermined time (6 frames in the third embodiment). After receiving the instruction, the pattern generation unit 6 displays the test image in the area directly under the front sensor for a predetermined time as instructed. Note that the image shown in FIG. 9B is displayed as the test image.

  In step S14, the integrated luminance of the test image display area when the test image is displayed using the front sensor is measured. In step S14, the control unit 5 instructs the front sensor 9 to measure the integrated luminance for a predetermined time (6 frames in the third embodiment). The front sensor 9 that has received the instruction measures the predetermined time and obtains the integrated luminance b.

  In step S15, the change amount management unit 10 requests the front sensor 9 to output the measured integrated luminance b to the change amount management unit 10, and the change amount management unit 10 receives the integrated luminance b received from the front sensor 9. Is stored as response luminance (L1).

  In step S16, the change amount management unit 10 receives the response luminance (L1) from the front sensor 9, and calculates a response rate ODk = L1 / L0 with the stored reference luminance (L0).

  In step S <b> 17, the control unit 5 receives the response rate ODk calculated by the change amount management unit 10 and transmits the response rate ODk to the response speed correction unit 8. Further, the response speed correction unit 8 determines the response speed correction value so that the response brightness (L1) approaches the reference brightness (L0) based on the received response rate ODk. Even when the response speed of the liquid crystal changes, a good moving image display can be provided.

In the third embodiment, the response speed is measured when the response speed correction is on. However, the response speed is determined by measuring the response speed correction off or on and off. May be.
In this case, by determining the quality of the response speed compensation means based on the integrated luminance when the response speed compensation means is valid and invalid, it is determined whether the response speed compensation means is functioning as expected. It can also be used as a device or part thereof.
In other words, it is possible to automatically check the quality of the response speed correction function by comparing the response brightness with the reference brightness measured when each test image in the form of a movie is displayed by the brightness sensor provided at the top of the screen. Become.
Further, by creating a correction value for response speed correction so that the response brightness approaches the reference brightness based on the response rate ODk, when the response speed of the liquid crystal itself changes due to a change in the temperature of the liquid crystal, etc. Also, it becomes possible to provide a desired moving image display performance.

  In the third embodiment, the example in which the change amount management unit 10 acquires the reference luminance based on the measurement value obtained by the front sensor 9 when the reference image is displayed has been described. The reference luminance acquisition method is not limited to the method based on actual measurement. For example, the first gradation value, the second gradation value, and the gradation value of the pixel that repeatedly changes in the first measurement image (test image) are the number of frames and the second gradation value that are the first gradation values. A method of acquiring information that is predetermined according to the number of frames and stored in the storage unit may be used. For example, in the example of FIG. 9, in the first measurement image (test image), a pixel that repeats changing between the first gradation value and the second gradation value (for example, the upper left pixel) is the first gradation value. The number of frames that are (Lb) is 3, and the number of frames that are the second gradation value (Lw) is 3. Under the condition that the APL of the test image and the reference image are the same, even in the reference image, the pixel has the first gradation value in 3 frames and the second gradation value in 3 frames. The gradation change pattern in the reference image is a gradation change pattern in which three frames are continuous and have the first gradation value, and the subsequent three frames are continuously and have the second gradation value, as in the example of FIG. A measurement value obtained by the front sensor when such a gradation change pattern is displayed may be obtained in advance and stored in the storage means, or an estimated value of the measurement value obtained by the front sensor is obtained in advance by model calculation and stored. It may be stored in the means.

  Further, the reference luminance can be acquired by the following method. A measured value (fifth measured value) by the front sensor when a still image composed of pixels of the first gradation value is displayed on the liquid crystal panel and a stationary composed of pixels of the second gradation value on the liquid crystal panel. The measurement value (sixth measurement value) obtained by the front sensor when the image is displayed is acquired. Then, in the fifth measurement value, the sixth measurement value, and the first measurement image (test image), the number of frames in which the gradation value of the pixel that repeats the change is the first gradation value and the second number of frames. Based on the above, the reference luminance is calculated. Assuming that the number of frames of the first gradation value is 3 and the number of frames of the second gradation value is 3, and the reference image has a small gradation change frequency so that it can be regarded as a still image, the fifth measurement value for three frames The reference luminance can be estimated based on the value obtained by adding the sixth measurement values for three frames.

Example 4
Next, a response speed measurement method using a test image different from that in Example 3 will be described below.
FIG. 12 is a functional block diagram of a display device having a liquid crystal panel in the fourth embodiment.
The display device in FIG. 12 is different from the third embodiment in that a reference image generation unit 13 and a test image generation unit 14 are provided instead of the pattern generation unit 6. Note that a description of components common to the third embodiment is omitted.

  When measuring the reference luminance, the reference image generation unit 13 receives an instruction from the control unit 5 and generates a reference image that is moving image data that is n times the frame period of the liquid crystal panel 1. The image data is transmitted to 7. As the reference image, for example, an image data group including six moving image frames shown in FIGS. 13A and 13B is used.

FIG. 13A is a reference image used for the luminance measurement at the time of rising. For the pixels that were dark image data Lb in the first and second frames, bright image data Lw is arranged in the third to fourth frames. Dark image data Lb is arranged in the frame.
FIG. 13B is a reference image used for luminance measurement at the time of falling. In the pixels where the first and second frames are bright image data Lw, dark image data Lb is arranged in the third and fourth frames. In the sixth frame, bright image data Lw is arranged.

The reference image used for the brightness measurement at the rising edge is defined as a reference image Tr, and the reference image used for the brightness measurement at the falling edge is defined as a reference image Tf.
Since the reference image Tr is used for measuring the reference luminance at the time of rising, it is desirable to provide at least two frames longer gradation maintaining periods when transitioning from the dark image data Lb to the bright image data Lw.
Similarly, since the reference image Tf is used for measuring the reference luminance at the time of falling, it is desirable to provide a gradation maintaining period that is long for at least two frames or more when transitioning from the bright image data Lw to the dark image data Lb.

FIG. 14A is a test image Tr used for response luminance measurement at the time of rising. The first frame, the third to fourth frames, and the sixth frame are dark image data Lb, and the second frame and the fifth frame are Bright image data Lw is arranged.
Since the test image Tr is used for response luminance measurement at the time of start-up, the frame before and after the bright image data Lw is dark image data Lb, and the bright image data Lw is short as one frame period.

FIG. 14B is a test image Tf used for response luminance measurement at the time of falling. The first frame, the third to fourth frames, and the sixth frame are bright image data Lw, and the second and fifth frames. Is arranged with dark image data Lb.
Since the test image Tf is used for response luminance measurement at the time of falling, the frames before and after the dark image data Lb are characterized by the bright image data Lw and the dark image data Lb is as short as one frame period.

Note that the number of frames of the reference image Tr and the test image Tr is the same, and the average picture level (APL) between the six frames is preferably the same, and the number of gradation transitions is different.
Similarly, it is desirable that the reference image Tf and the test image Tf have the same number of frames, the same average picture level (APL) between the six frames, and the number of gradation transitions is different.

  FIG. 15 shows time just on the horizontal axis and the transmittance of the liquid crystal on the vertical axis, as in Example 3 and FIG. 10, and is displayed directly below the front sensor when the pixel brightness changes from dark to bright to dark. The state of the transition of the transmittance of the liquid crystal in the region is shown. FIG. 15A shows an example of transmittance transition and integral luminance when a reference image is displayed, and FIGS. 15B and 15C show transmittance transition and integral when a test image is displayed. An example of luminance is shown.

FIG. 15A shows the relationship between the transmittance transition a when the reference image is displayed on the liquid crystal panel 1 and the integrated luminance a which is a luminance value obtained by integrating the transmittance transition a for six frame periods.
Since the reference image is an image that has a lower transition frequency than the test image and is close to a still image, and is not easily affected by the luminance change due to the response delay of the liquid crystal, in Example 4, the luminance value of the integrated luminance a is defined as the reference luminance. .
If higher accuracy is required, or if measurement under lower luminance conditions is required, increase the number of frames of the reference image and test image and increase the integration time according to the increment. Good.
In the fourth embodiment, it is assumed that the reference luminance in FIG. 15A is measured in advance and the reference luminance is held in advance.

FIG. 15B shows an example of the relationship between the transmittance transition b when the test image is displayed when the temperature of the liquid crystal is 25 ° C., and the integral luminance b that is the integral luminance of the six-frame period. The integrated luminance b is defined as response luminance 1.
Since the response luminance 1 is 75% with respect to the reference luminance, it can be determined that the response speed of the liquid crystal is slower than the reference.
This indicates that the response speed of the liquid crystal tends to be slower as the temperature of the liquid crystal is lower, so that the gain of the correction value for the response speed correction is insufficient in this state.

FIG. 15C shows an example of the relationship between the transmittance transition c when the test image is displayed when the temperature of the liquid crystal is 35 ° C. and the integral luminance c that is the integral luminance of the six-frame period. The integral luminance c is defined as response luminance 2.
Since the response luminance 2 is 100% which is the same as the reference luminance, it can be determined that the response speed of the liquid crystal is equivalent to the reference.
That is, when the reference luminance and the response luminance (third measured value) are equal (the difference is small), it indicates that the gain of the response speed correction value is appropriate (the correction of the response speed correction unit 8). The effect is normal). When the reference brightness and the response brightness (third measured value) are different (the difference is large), the gain of the response speed correction value is inappropriate (the correction speed of the response speed correction unit 8 needs to be adjusted). Yes).

  In addition, since the response luminance 1 does not satisfy the reference luminance, a correction value that approximates the reference luminance to the gain of the correction value applied by the response speed correction unit 8 can be applied immediately after starting or in a low temperature environment. An image can be displayed at a high response speed.

Next, FIG. 16 shows a flowchart for measuring the reference brightness and response brightness correlated with the response speed, and changing the correction strength of the response speed correction using the measurement result.
Hereinafter, each step shown in FIG. 16 will be described in detail.

  In step S161, a reference image for measuring the reference luminance is displayed in an area immediately below the front sensor for a predetermined time. In step S161, the control unit 5 instructs the pattern generation unit 6 to display a predetermined reference image in an area immediately below the front sensor for a predetermined time (six frame periods). After receiving the instruction, the pattern generation unit 6 displays the reference image in an area immediately below the front sensor for a predetermined time as instructed. Note that the image shown in FIGS. 13A and 13B is displayed as the reference image. 13A is used as a reference image when measuring rising response luminance, and FIG. 13B is used as a reference image when measuring falling response luminance.

  In step S162, the control unit 5 instructs the front sensor 9 to measure the integrated luminance in the measurement time of 6 frame periods in the fourth embodiment. The front sensor 9 that has received the instruction measures the integrated luminance a.

  In step S163, the integrated luminance a is held as the reference luminance (L0).

  In step S164, a test image for measuring response luminance is displayed in an area immediately below the front sensor for a predetermined time. In step S164, the control unit 5 instructs the pattern generation unit 6 to display a predetermined test image in the area immediately below the front sensor for a predetermined time (six frame periods). Note that the images shown in FIGS. 14A and 14B are displayed as test images. However, an image different from the reference image is used as the test image.

  In step S165, the control unit 5 instructs the front sensor 9 to measure the integrated luminance in the measurement time of 6 frame periods in the fourth embodiment. In step S165, the change amount management unit 10 requests the front sensor 9 to output the measured integrated luminance b to the change amount management unit 10, and the change amount management unit 10 receives the response luminance (from the front sensor 9). Save as L1).

  In step S166, the change amount management unit 10 receives the reference luminance (L0) and the response luminance (L1) from the front sensor 9, and the response rate ODk = L1 / L0 from the stored reference luminance (L0) and the response luminance (L0). Calculate

  In step S167, the control unit 5 receives the response rate ODk calculated by the change amount management unit 10, and determines whether or not the response rate ODk is 1. If it is 1, the process proceeds to step S168. If the response rate ODk is other than 1, the process proceeds to step S169. Note that a threshold may be provided for the determination of the response rate ODk. In this case, for example, if the response rate ODk is within the range of 0.9 to 1.1, the process proceeds to step S168, and 0.9 to 1.1. If it is out of the range, the process proceeds to step S169.

  In step S168, since there is no deviation between the reference luminance and the response luminance or it is below a certain level, the gain of the correction value that determines the strength of the response speed correction is not changed.

  On the other hand, in step S169, since there is a difference between the reference luminance and the response luminance, the correction value or gain for determining the response speed correction strength is changed so as to approach the reference luminance, and the process returns to step S161. For example, when the response luminance (third measured value) is smaller than the reference luminance, adjustment is performed to increase the correction intensity of the response speed correction unit 8. When the response luminance (third measured value) is larger than the reference luminance, adjustment is performed to weaken the correction intensity of the response speed correction unit 8.

  In the above flow chart, the reference brightness and the response brightness are measured, and the response speed correction is determined from the difference between the two measurement values. Therefore, it is possible to provide good moving image display performance even when the temperature changes.

In the fourth embodiment, when the response speed correction is on, the test image and the reference image are different from each other and the response speed is measured. However, the response speed correction is off or on and off. The response speed may be determined by measuring at In this case, the test image and the reference image can be the same image.
In this case, it is determined whether the response speed compensation means is functioning as expected by determining the quality of the response speed compensation means based on the integrated luminance when the response speed compensation means is valid and invalid. It can also be used as a device or part thereof.

According to the third and fourth embodiments, in response to a user's request, the determination device uses the luminance sensor of the display device to acquire the integrated luminance when the response speed correction function is on and off, and the ratio of each integrated luminance Alternatively, the quality of the response speed correction function can be automatically confirmed from the difference.
Furthermore, according to the present invention, by comparing the reference luminance with the response luminance measured by the luminance sensor provided on the screen, the degree of correction of the response speed at the time of low luminance or the gradation transition in the dark portion is correctly measured. Therefore, the response speed correction can be performed so as to obtain a desired response speed.
Thereby, a user's convenience can be improved.

(Other examples)
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

1: liquid crystal panel, 5: control unit, 6: pattern generation unit, 7: screen composition unit, 8: response speed correction unit, 9: front sensor, 11: quality control unit

Claims (21)

Correction means for performing correction control for correcting the response speed of the display panel;
Measuring means for measuring luminance in a predetermined measurement area of the display panel;
Display control means for displaying a measurement image which is a moving image in the measurement region;
A determination unit for determining the effect of the correction control based on a measurement value obtained by time integration of luminance over a plurality of frames by the measurement unit;
With
The determination means includes
A first measurement value by the measurement means when displaying the measurement image with the correction control enabled; and
A determination apparatus that determines an effect of the correction control based on a second measurement value by the measurement unit when the measurement image is displayed with the correction control disabled.   The determination apparatus according to claim 1, wherein the determination unit determines the effect of the correction control based on a measurement value of luminance over time according to the length of the measurement image. The determination means includes
When the difference between the first measurement value and the second measurement value is greater than or equal to a threshold, it is determined that the effect of the correction control is normal;
The determination device according to claim 1, wherein when the difference between the first measurement value and the second measurement value is smaller than a threshold value, the effect of the correction control is determined not to be normal. An acquisition means for acquiring the temperature of the display panel;
The determination apparatus according to claim 3, wherein the threshold value is set to a value corresponding to the temperature of the display panel acquired by the acquisition unit.   The determination device according to claim 4, wherein the threshold value is set to a smaller value as the temperature of the display panel acquired by the acquisition unit is higher.   The determination device according to claim 4, wherein the correction unit adjusts the intensity of correction by the correction control according to the temperature of the display panel acquired by the acquisition unit.   The determination device according to claim 6, wherein the threshold value is set to a value according to the temperature of the display panel acquired by the acquisition unit and the intensity of correction by the correction control.   The display control means, as the measurement image, a pixel in which the gradation value of at least one of the colors constituting the pixel of the display panel repeatedly changes from the first gradation value to the second gradation value. The determination apparatus according to claim 1, wherein a moving image including the image is displayed in the measurement region.   The display control means has a gradation value of at least one of the colors constituting the pixels of the display panel adjacent in at least one of a horizontal direction and a vertical direction as the measurement image. A first frame including a pixel having a gradation value and a pixel having a second gradation value; and a pixel having the first gradation value and a pixel having the second gradation value in the first frame. The determination apparatus according to claim 1, wherein a moving image including a second frame whose position is changed is displayed in the measurement region. The threshold is
When the correction control is effective and the effect is normal, information on the change in transmittance when the measurement image is displayed on the display panel;
The information according to any one of claims 3 to 7, which is set based on information on a change in transmittance when the measurement image is displayed on the display panel when the correction control is invalid. Judgment device. The display control means, as the measurement image, a pixel in which the gradation value of at least one of the colors constituting the pixel of the display panel repeatedly changes from the first gradation value to the second gradation value. And displaying a first measurement image comprising:
2. The determination unit according to claim 1, wherein the determination unit determines an effect of the correction control based on a third measurement value obtained by the measurement unit when the first measurement image is displayed and a reference luminance. The determination apparatus described. The display control means, as the measurement image, a pixel in which the gradation value of at least one of the colors constituting the pixel of the display panel repeatedly changes from the first gradation value to the second gradation value. And further displaying a second measurement image that is less frequently repeated than the first measurement image,
The determination device according to claim 11, wherein the determination unit uses a fourth measurement value obtained by the measurement unit when the second measurement image is displayed as the reference luminance.   The determination device according to claim 12, wherein the first measurement image and the second measurement image have the same number of frames and the same average image level. The first gradation value, the second gradation value, and the number of frames in which the gradation value of the pixel that repeatedly changes in the first measurement image is the first gradation value and the frame that is the second gradation value. Storage means for storing information of a reference brightness predetermined according to the number,
The determination device according to claim 11, wherein the determination unit acquires the reference luminance from the storage unit. The determination means includes
A fifth measurement value by the measurement means when a still image composed of pixels of the first gradation value is displayed on the display panel;
A sixth measurement value by the measurement means when a still image composed of pixels of the second gradation value is displayed on the display panel;
Get
In the fifth measurement value, the sixth measurement value, and the first measurement image, the gradation value of the pixel that repeats the change is the number of frames that is the first gradation value and the number of frames that is the second gradation value. The determination device according to claim 11, wherein a value calculated based on the reference luminance is used as the reference luminance. The determination means includes
If the third measurement value and the reference luminance are equal, it is determined that the effect of the correction control is normal,
The determination device according to claim 11, wherein when the third measurement value is different from the reference luminance, it is determined that the intensity of the correction control needs to be adjusted. The correction means includes
If the third measurement value is smaller than the reference brightness, an adjustment is made to increase the intensity of the correction,
The determination device according to any one of claims 11 to 16, wherein when the third measurement value is larger than the reference luminance, adjustment is performed to reduce the strength of the correction.   The first gradation value and the second gradation value are set based on a gradation change in which the effect of the correction control is most likely to appear or a gradation value that appears frequently in a medical image. The determination apparatus according to any one of the above.   The determination apparatus according to claim 1, further comprising notification means for notifying a determination result by the determination means.   The display apparatus provided with the determination apparatus of any one of Claims 1-19. A correction process for performing correction control for correcting the response speed of the display panel;
A measurement step of measuring the luminance in a predetermined measurement area of the display panel;
A display control step of displaying a measurement image that is a moving image in the measurement region;
A determination step of determining the effect of the correction control based on a measurement value by time integration of luminance over a plurality of frames in the measurement step;
Have
In the determination step,
A first measurement value by the measurement step when the measurement image is displayed with the correction control enabled; and
A control method of a determination apparatus, wherein the effect of the correction control is determined based on a second measurement value obtained by the measurement step when the measurement image is displayed with the correction control disabled.

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