Backlight delay detection method and system for display panel

Abstract

The application discloses a backlight delay detection method and system of a display panel. The method comprises the following steps: after local dimming of the display panel is turned on, the display panel is controlled to switch from a first display picture to a second display picture; the interval time length between the maximum display brightness and the minimum display brightness of the display panel in the switching process is detected to obtain a first time length; after the local dimming of the display panel is turned off, the display panel is controlled to switch from the first display picture to the second display picture; the interval time length between the maximum display brightness and the minimum display brightness of the display panel in the switching process is detected to obtain a second time length; and the backlight delay time length of the display panel is determined according to the first time length and the second time length. The application can detect the backlight delay of the display panel, and then judge the display effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a backlight delay detection method and system of a display panel. BACKGROUND

[0002] Compared with the traditional LED backlight, the Mini LED backlight has advantages in display effect and thinness, and can realize high peak brightness, high contrast, low power consumption, high reliability and other advantages. Compared with OLED, the Mini LED backlight has cost advantage, and the display effect can be comparable to OLED.

[0003] The final display picture of the Mini LED backlight display panel is obtained by superimposing the OC signal (display screen signal) and the backlight signal. As shown in Figure 1 The data processed by the SoC 100 is transmitted in two paths. One path is transmitted to the MCU 500 for processing, and then the data processed by the MCU 500 is transmitted to the Mini LED driver 600 for processing to obtain the backlight signal acting on the Mini LED 700. The other path is transmitted to the Tcon 200 for processing, and then the data processed by the Tcon 200 is transmitted to the LCD driver 300 for processing to obtain the display screen signal acting on the LCD panel 400. However, the processing time of the two paths is different, resulting in different synchronization of the backlight signal and the display screen signal, and the backlight delay phenomenon occurs.

[0004] The backlight delay phenomenon may cause the display panel to display moving objects, and there are trailing, ghosting and other phenomena in the opposite direction of the object movement direction, affecting the display effect. Therefore, it is urgent to provide a detection method to detect the backlight delay of the display panel. SUMMARY

[0005] The embodiments of the present application provide a backlight delay detection method and system of a display panel, which can detect the backlight delay of the display panel and further judge the display effect.

[0006] The embodiments of the present application provide a backlight delay detection method of a display panel, comprising:

[0007] After turning on the local dimming of the display panel, the display panel is controlled to switch from a first display picture to a second display picture;

[0008] Detect the interval time length of the maximum display brightness and the minimum display brightness of the display panel in the switching process to obtain a first time length;

[0009] After turning off the local dimming of the display panel, the display panel is controlled to switch from the first display picture to the second display picture;

[0010] detect a time interval between the maximum display brightness and the minimum display brightness of the display panel during the switching process, to obtain a second time interval;

[0011] determine a backlight delay time interval of the display panel according to the first time interval and the second time interval.

[0012] Optionally, the detecting the time interval between the maximum display brightness and the minimum display brightness of the display panel during the switching process comprises:

[0013] detecting the display brightness of the display panel in real time during the switching process;

[0014] obtain a brightness curve, the brightness curve being a curve of the display brightness of the display panel changing with time during the switching process;

[0015] determine a time difference between the maximum display brightness and the minimum display brightness in the brightness curve, and take the time difference as the time interval between the maximum display brightness and the minimum display brightness of the display panel during the switching process.

[0016] Optionally, after the obtaining the brightness curve, the method further comprises:

[0017] smooth the brightness curve.

[0018] Optionally, the first display picture comprises a first background picture and a first window picture, the brightness detection point of the display panel corresponds to the first window picture; the second display picture comprises a second background picture and a second window picture, the brightness detection point corresponds to the second background picture, and the brightness detection point is a detection position for detecting the display brightness of the display panel.

[0019] Optionally, the gray scale values of the first background picture and the second background picture are 0, and the gray scale values of the first window picture and the second window picture are 255.

[0020] Optionally, the area of the first window picture accounts for 10% of the area of the first display picture, and the area of the second window picture accounts for 10% of the area of the second display picture.

[0021] Optionally, the brightness detection point is located at the display center of the display panel, the first window picture is located at the center of the first display picture, and the second window picture is located at the edge of the second display picture.

[0022] Optionally, the method further comprises:

[0023] score the display effect of the display panel based on the backlight delay time interval.

[0024] Optionally, the scoring of the display effect of the display panel based on the backlight delay duration comprises:

[0025] If the backlight delay duration is 0, the score of the display effect of the display panel is the highest;

[0026] If the backlight delay duration is greater than the first preset duration and less than or equal to the second preset duration, the greater the backlight delay duration, the lower the score of the display effect of the display panel;

[0027] If the backlight delay duration is greater than 0 and less than or equal to the first preset duration, or the backlight delay duration is greater than the second preset duration, the score of the display effect of the display panel is the lowest.

[0028] The embodiment of the present application also provides a backlight delay detection system of a display panel, comprising a display panel, a luminance meter, and a server connected with the display panel and the luminance meter respectively;

[0029] The display panel is used for displaying a picture;

[0030] The luminance meter is used for detecting the display luminance of the display panel;

[0031] The server is used for detecting the backlight delay of the display panel by using the backlight delay detection method of the display panel.

[0032] The beneficial effects of the present application are: after turning on the local dimming of the display panel, the display panel is controlled to switch from a first display picture to a second display picture, and the interval duration between the maximum display luminance and the minimum display luminance of the display panel in the switching process is detected; after turning off the local dimming of the display panel, the display panel is controlled to switch from the first display picture to the second display picture, and the interval duration between the maximum display luminance and the minimum display luminance of the display panel is detected; the backlight delay duration of the display panel is determined according to the two interval durations, so as to realize the detection of the backlight delay duration of the display panel, and further judge the display effect of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0033] The technical scheme and other beneficial effects of the present application will be apparent from the following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings.

[0034] Figure 1 A display principle diagram of a Mini LED backlight display panel;

[0035] Figure 2 A flowchart of a backlight delay detection method of a display panel provided by the embodiment of the present application;

[0036] Figure 3A schematic diagram of a first display frame in a backlight delay detection method of a display panel provided by an embodiment of the present application;

[0037] Figure 4 A schematic diagram of a second display frame in a backlight delay detection method of a display panel provided by an embodiment of the present application;

[0038] Figure 5 A luminance curve in a backlight delay detection method of a display panel provided by an embodiment of the present application;

[0039] Figure 6 An eye flicker characteristic curve in a backlight delay detection method of a display panel provided by an embodiment of the present application;

[0040] Figure 7 A corresponding relationship diagram between a backlight delay duration and a score in a backlight delay detection method of a display panel provided by an embodiment of the present application;

[0041] Figure 8 A structural schematic diagram of a backlight delay detection system of a display panel provided by an embodiment of the present application. DETAILED DESCRIPTION

[0042] The specific structural and functional details disclosed herein are merely representative for purposes of describing the exemplary embodiments of the present application. The present application, however, can be embodied in many alternatives, and therefore should not be construed as being limited to the embodiments set forth herein.

[0043] In the description of the present application, it needs to be understood that the terms "center", "transverse", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0044] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0045] The terms used herein are only used to describe specific embodiments and are not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, the singular form "a", "an", "one" used herein is also intended to include the plural. It should also be understood that the terms "include" and / or "contain" used herein specify the existence of the stated features, integers, steps, operations, units and / or components, without excluding the existence or addition of one or more other features, integers, steps, operations, units, components and / or combinations thereof.

[0046] The application will be further described below in conjunction with the drawings and examples.

[0047] Referring to Figure 2 , the flowchart of the backlight delay detection method of the display panel provided by the embodiment of the application. Among them, the display panel can be a Mini LED backlight display. The method comprises steps 101 to 105:

[0048] Step 101, after starting the local dimming of the display panel, the display panel is controlled to switch from the first display picture to the second display picture.

[0049] Local dimming refers to that the Mini LED backlight of the display panel can be adjusted according to the brightness of the display picture, so that the brightness of the highlight part in the display picture can reach the maximum, while the brightness of the dark part is reduced or even turned off, so as to achieve the best contrast.

[0050] After starting the local dimming of the display panel, the display panel displays the first display picture. As shown in Figure 3 , the first display picture 1 can include a first background picture 11 and a first window picture 12. The first window picture 12 can be located at the center of the first display picture 1, and the other pictures in the first display picture 1 except the first window picture 12 are the first background picture 11. The first window picture 12 can be rectangular, and the area of the first window picture 12 can account for 10% of the area of the first display picture 1. The gray scale of the first background picture 11 can be 255, and the gray scale of the first window picture 12 can be 0.

[0051] Then, the display panel is controlled to display a second display screen, i.e., the display panel is controlled to switch from the first display screen to the second display screen. As shown in Figure 4 The second display screen 2 can include a second background screen 21 and a second window screen 22. The second window screen 22 can be located at the edge of the second display screen 2, and the screen other than the second window screen 22 in the second display screen 2 is the second background screen 21. The second window screen 22 is the same as the first window screen 12, i.e., the size and shape of the second window screen 22 are the same as those of the first window screen 12. The second window screen 22 can be rectangular, and the area of the second window screen 22 can account for 10% of the area of the second display screen 2. The gray scale of the second background screen 21 can be 255, and the gray scale of the second window screen 22 can be 0.

[0052] It should be noted that the display panel is switched from the first display screen 1 to the second display screen 2, which is used to simulate the movement of the window, i.e., the window is moved from the position in the first display screen 1 (the position of the first window screen 12) to the position in the second display screen 2 (the position of the second window screen 22). The area of the first window screen 12 accounts for 10% of the area of the first display screen 1, so as to ensure that the display panel outputs the maximum display brightness.

[0053] Step 102, detecting the interval time length between the maximum display brightness and the minimum display brightness of the display panel in the switching process to obtain a first time length.

[0054] A brightness detection point of the display panel is set, which is a detection position for detecting the display brightness of the display panel, i.e., the display brightness of the display panel is detected at the brightness detection point. After the display panel displays the first display screen, the brightness detection point corresponds to the first window screen in the first display screen. As shown in Figure 3 The brightness detection point 3 is located at the display center of the display panel, i.e., the brightness detection point 3 corresponds to the center of the first display screen 1, and the first window screen 12 is located at the center of the first display screen 1, so that the brightness detection point 3 corresponds to the center of the first window screen 12.

[0055] After the brightness detection point is set, the position is fixed and unchanged, and after the display screen is switched from the first display screen to the second display screen, the brightness detection point corresponds to the second background screen in the second display screen. As shown in Figure 4 The brightness detection point 3 is located at the display center of the display panel, i.e., the brightness detection point 3 corresponds to the center of the second display screen 2, and the second window screen 22 is located at the edge of the second display screen 2, so that the brightness detection point 3 does not correspond to the second window screen 22. It should be noted that the second window screen 22 needs to be as far away from the brightness detection point 3 as possible to avoid interference of the second window screen 22 on the brightness detection of the display panel.

[0056] In the process of controlling the display panel to switch from the first display picture to the second display picture, the display brightness at the brightness detection point of the display panel is detected to determine the interval duration of the maximum display brightness and the minimum display brightness of the display panel, i.e., the first duration.

[0057] Specifically, the detection of the interval duration of the maximum display brightness and the minimum display brightness of the display panel in the switching process in step 102 obtains the first duration, including:

[0058] Real-time detection of the display brightness of the display panel in the switching process;

[0059] Obtaining a brightness curve, which is a curve of the display brightness of the display panel changing with time in the switching process;

[0060] Determining the time difference between the maximum display brightness and the minimum display brightness in the brightness curve, and taking the time difference as the interval duration of the maximum display brightness and the minimum display brightness of the display panel in the switching process to obtain the first duration.

[0061] Real-time detection of the display brightness of the display panel at the brightness detection point in the switching process, and obtaining a brightness curve, i.e., a first brightness curve, according to the corresponding relationship between the real-time detected display brightness and time.

[0062] Due to the noise influence in the process of detecting the display brightness, the obtained first brightness curve is a non-smooth brightness curve. After obtaining the first brightness curve, the first brightness curve can be smoothed. Specifically, the first brightness curve is processed by filtering and smoothing, such as sliding average method or low-pass filtering method. Figure 5 As shown in FIG. 4, the brightness curve corresponding from 0 to ta is the first brightness curve.

[0063] Then, the time corresponding to the maximum display brightness in the first brightness curve is determined as t1, the time corresponding to the minimum display brightness in the first brightness curve is determined as ta, and the time difference ta-t1 between t1 and ta is the interval duration of the maximum display brightness and the minimum display brightness of the display panel in the switching process, i.e., the first duration T1=ta-t1.

[0064] It should be noted that after the display panel displays the first display picture, the brightness detection point corresponds to the first window picture, and the gray scale of the first window picture is 255, at which time the display brightness detected by the brightness detection point is the maximum. After the display panel displays the second display picture, the brightness detection point corresponds to the second background picture, and the gray scale of the second background picture is 0, at which time the display brightness detected by the brightness detection point is the minimum.

[0065] Step 103, after the local dimming of the display panel is closed, the display panel is controlled to switch from the first display picture to the second display picture.

[0066] After the local dimming of the display panel is closed, the display panel displays the first display picture. The first display picture is the same as the first display picture displayed by the display panel after the local dimming of the display panel is opened, and will not be described in detail here.

[0067] Then, the display panel displays the second display picture, that is, the display panel is controlled to switch from the first display picture to the second display picture. The second display picture is the same as the second display picture displayed by the display panel after the local dimming of the display panel is opened, and will not be described in detail here.

[0068] Step 104, detecting the interval time length between the maximum display brightness and the minimum display brightness of the display panel, obtaining the second time length.

[0069] The position of the brightness detection point of the display panel is set to be the same as the position of the brightness detection point (i.e. the position of the brightness detection point set after the local dimming of the display panel is opened), and will not be described in detail here.

[0070] During the process of controlling the display panel to switch from the first display picture to the second display picture, the display brightness of the display panel at the brightness detection point is detected to determine the interval time length between the maximum display brightness and the minimum display brightness of the display panel, that is, the second time length.

[0071] Specifically, the detection of the interval time length between the maximum display brightness and the minimum display brightness of the display panel in the switching process in step 104 to obtain the second time length comprises:

[0072] Real-time detection of the display brightness of the display panel in the switching process;

[0073] Obtaining a brightness curve, the brightness curve being a curve of the display brightness of the display panel changing with time in the switching process;

[0074] Determining the time difference between the maximum display brightness and the minimum display brightness in the brightness curve, and taking the time difference as the interval time length between the maximum display brightness and the minimum display brightness of the display panel in the switching process to obtain the second time length.

[0075] Real-time detection of the display brightness of the display panel at the brightness detection point in the switching process, and obtaining a brightness curve, that is, a second brightness curve, according to the corresponding relationship between the real-time detected display brightness and time.

[0076] Due to the influence of noise in the process of detecting the display brightness, the obtained second brightness curve is a non-smooth brightness curve. After obtaining the second brightness curve, the second brightness curve can be smoothed. Specifically, the second brightness curve is processed by filtering and smoothing, such as the sliding average method or low-pass filtering method. As shown in FIG. 2, the brightness curve corresponding to the time from 0 to tb is the second brightness curve. Figure 5

[0077] Then, the time corresponding to the maximum display brightness in the second brightness curve is determined as t1, and the time corresponding to the minimum display brightness in the second brightness curve is determined as tb, and the time difference tb-t1 between t1 and tb is the interval time length of the maximum display brightness and the minimum display brightness of the display panel in the switching process, that is, the second time length T2=tb-t1.

[0078] Step 105, determining the backlight delay time length of the display panel according to the first time length and the second time length.

[0079] After the local dimming of the display panel is turned on, the Mini LED backlight is adjusted, resulting in a long processing time of the backlight signal, that is, the first time length T1 is greater than the second time length T2. The difference between the first time length T1 and the second time length T2 is the backlight delay time length T3=T1-T2 of the display panel.

[0080] The backlight delay of the display panel will affect the display effect of the display panel, and therefore the detection of the backlight delay of the display panel can provide a basis for the evaluation of the display effect of the display panel.

[0081] Specifically, the method further comprises:

[0082] Based on the backlight delay time length, the display effect of the display panel is scored.

[0083] The backlight delay time length T3 of the display panel cannot be too large or too small. When the backlight delay time length T3 is too large, the backlight signal lags seriously, and when the display panel displays a moving picture, there is a serious trailing and ghosting phenomenon. When the backlight delay time length T3 is too small, due to the delay effect of the human eye to light, when a certain intensity of light suddenly enters the retina, the human eye cannot obtain the brightness at that moment. As shown in FIG. 3, when the backlight delay time length T3 is about in the range of 0.05 seconds to 0.15 seconds, the subjective brightness feeling of the human eye rises to the maximum, which may be greater than the actual light brightness, and a very strong flicker feeling appears. Figure 6

[0084] Therefore, in combination with the flicker characteristics of the human eye, the display effect of the display panel can be evaluated from the dimension of backlight delay. Specifically, the scoring of the display effect of the display panel based on the backlight delay time length comprises:​​

[0085] If the backlight delay duration is 0, the score of the display effect of the display panel is the highest;

[0086] If the backlight delay duration is greater than the first preset duration and less than or equal to the second preset duration, the greater the backlight delay duration, the lower the score of the display effect of the display panel;

[0087] If the backlight delay duration is greater than 0 and less than or equal to the first preset duration, or the backlight delay duration is greater than the second preset duration, the score of the display effect of the display panel is the lowest.

[0088] When the display effect of the display panel is scored based on the backlight delay dimension, the score of the display effect changes with the change of the backlight delay duration T3. When the backlight delay duration T3 is 0s, there is no delay on the surface, and the score of the display effect is the highest; when the backlight delay duration T3 is between the first preset duration and the second preset duration, the score of the display effect is inversely proportional to the backlight delay duration, that is, the greater the backlight delay duration, the lower the score of the display effect; when the backlight delay duration T3 is in other ranges, the score of the display effect is the lowest. The first preset duration can be 0.15s, and the second preset duration can be 0.3s.

[0089] For example, the highest score of the display effect is 100, and the lowest score of the display effect is 0, and the score Goal of the display effect is:

[0090]

[0091] As shown in the formula (1), when T3=0s, there is no delay, and the score of the display effect is 100; when 0s Figure 7 The score of the display effect is calculated by the formula (2).

[0092] In summary, after the local dimming of the display panel is turned on, the display panel is controlled to switch from the first display picture to the second display picture, and the interval duration between the maximum display brightness and the minimum display brightness of the display panel in the switching process is detected, after the local dimming of the display panel is turned off, the display panel is controlled to switch from the first display picture to the second display picture, and the interval duration between the maximum display brightness and the minimum display brightness of the display panel is detected, and the backlight delay duration of the display panel is determined according to the two interval durations, so as to realize the detection of the backlight delay duration of the display panel, and further judge the display effect of the display panel.

[0093] Correspondingly, the embodiment of the present application also provides a backlight delay detection system of a display panel.​

[0094] As Figure 8 shown in the figure, the backlight delay detection system of the display panel provided by the embodiment of the present application comprises a display panel 10, a luminance meter 20 and a server 30 connected with the display panel 10 and the luminance meter 20 respectively. Wherein, the display panel 10 is used for displaying a picture; the luminance meter is used for detecting the display luminance of the display panel 10; and the server 30 is used for detecting the backlight delay of the display panel by using the backlight delay detection method of the display panel, which will not be described in detail here.

[0095] Specifically, the server 30 sends a display picture to the display panel 10, so that the display panel 10 displays a first display picture first and then displays a second display picture. The luminance meter 20 is placed at a luminance detection point and is aligned with the display panel 10, so as to detect the display luminance of the display panel 10 in the process of switching from the first display picture to the second display picture, and send the detected display luminance to the server 30. The server 30 calculates the backlight delay duration of the display panel according to the detected display luminance.

[0096] To sum up, after turning on the local dimming of the display panel, the embodiment of the present application controls the display panel to switch from the first display picture to the second display picture, and detects the interval duration between the maximum display luminance and the minimum display luminance of the display panel in the switching process. After turning off the local dimming of the display panel, the display panel is controlled to switch from the first display picture to the second display picture, and the interval duration between the maximum display luminance and the minimum display luminance of the display panel is detected. The backlight delay duration of the display panel is determined according to the two interval durations, so as to realize the detection of the backlight delay duration of the display panel, and further judge the display effect of the display panel.

[0097] To sum up, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not used to limit the present application. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application is subject to the scope defined by the claims.

Claims

1. A method for detecting backlight delay in a display panel, characterized in that, include: After enabling local dimming on the display panel, the display panel is controlled to switch from a first display screen to a second display screen. The first display screen includes a first background screen and a first window screen, and the brightness detection point of the display panel corresponds to the first window screen. The second display screen includes a second background screen and a second window screen, and the brightness detection point corresponds to the second background screen. The brightness detection point is a detection position for detecting the display brightness of the display panel, and its position remains fixed after being set. The grayscale values ​​of the first and second background screens are 0, and the grayscale values ​​of the first and second window screens are 255. The first duration is obtained by detecting the interval between the maximum and minimum display brightness of the display panel during the switching process; After turning off the local dimming of the display panel, control the display panel to switch from the first display screen to the second display screen; The second duration is obtained by detecting the interval between the maximum and minimum display brightness of the display panel during the switching process; The backlight delay duration of the display panel is determined based on the first duration and the second duration.

2. The backlight delay detection method for a display panel as described in claim 1, characterized in that, The interval between the maximum and minimum display brightness of the display panel during the detection switching process includes: Real-time monitoring of the display panel's brightness during the switching process; Obtain a brightness curve, which is a curve showing how the display brightness of the display panel changes over time during the switching process; Determine the time difference between the maximum and minimum display brightness in the brightness curve, and use the time difference as the interval between the maximum and minimum display brightness of the display panel during the switching process.

3. The backlight delay detection method for a display panel as described in claim 2, characterized in that, After obtaining the brightness curve, the process also includes: The brightness curve is smoothed.

4. The backlight delay detection method for a display panel as described in claim 1, characterized in that, The area of ​​the first window screen occupies 10% of the area of ​​the first display screen, and the area of ​​the second window screen occupies 10% of the area of ​​the second display screen.

5. The backlight delay detection method for a display panel as described in claim 1, characterized in that, The brightness detection point is located at the center of the display panel, the first window image is located at the center of the first display image, and the second window image is located at the edge of the second display image.

6. The backlight delay detection method for a display panel as described in claim 1, characterized in that, The method further includes: The display effect of the display panel is scored based on the backlight delay time.

7. The backlight delay detection method for a display panel as described in claim 6, characterized in that, The scoring of the display panel's display effect based on the backlight delay duration includes: If the backlight delay time is 0, the display effect of the display panel will receive the highest score. If the backlight delay duration is greater than the first preset duration and less than or equal to the second preset duration, then the longer the backlight delay duration, the lower the score for the display effect of the display panel. If the backlight delay duration is greater than 0 and less than or equal to the first preset duration, or if the backlight delay duration is greater than the second preset duration, then the display effect score of the display panel is the lowest.

8. A backlight delay detection system for a display panel, characterized in that, Includes a display panel, a luminance meter, and a server connected to the display panel and the luminance meter respectively; The display panel is used to display images; The luminance meter is used to detect the display brightness of the display panel; The server is used to detect the backlight delay of the display panel using the backlight delay detection method of the display panel as described in any one of claims 1 to 7.

Images