A device and method for debugging image retention on a display panel.

Abstract

The present invention discloses a display panel afterimage debugging device and debugging method, using V aging As the optimal Vcom before the afterimage test, during the debugging process, L0 ‑V aging ) and the absolute value of △(V L255 ‑V aging ) are all greater than 0.01V, the gamma voltage corresponding to the black screen is shifted in the same direction by △(V L0 ‑V aging ), shift the gamma voltage corresponding to the white screen in the same direction △(V L255 ‑V aging ), and then repeat the process of displaying the black and white chessboard screen and the third screen until △(V L0 ‑V aging ) and the absolute value of △(V L255 ‑V aging ) are all less than 0.01V, the final common voltage of the display panel and the gamma voltage corresponding to the black and white screen can be determined. aging As the optimal Vcom before the afterimage test, it can accurately debug the afterimage.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an afterimage debugging device and a debugging method for a display panel. Background Art

[0002] TFT-LCD (Thin Film Transistor Liquid Crystal Display) has become an important display platform in modern information technology and video products. The main working principle of TFT-LCD is to load appropriate voltage between the liquid crystal layer between the array substrate and the color filter (CF) substrate, so that the liquid crystal molecules in the liquid crystal layer are deflected under the action of voltage, and different voltages are used to control different transmittances, thereby realizing display.

[0003] However, due to the dielectric anisotropy of the liquid crystal itself, the liquid crystal material is easy to polarize and accumulate charges, and there are factors such as residual sand defects (screen end defects) in the TFT substrate manufacturing process, which makes the afterimage problem widespread in liquid crystal display panels. Summary of the invention

[0004] The embodiments of the present invention provide an afterimage debugging device and a debugging method for a display panel, which are used to solve the problem that afterimage debugging cannot be accurately debugged due to a defective screen end.

[0005] An embodiment of the present invention provides a display panel afterimage debugging device, comprising:

[0006] A control module connected to the display panel, the control module is used to control the display panel to display a first picture, an aging picture, a second picture, a black and white checkerboard picture and a third picture;

[0007] an acquisition module connected to the control module, the acquisition module being used to acquire a first common voltage according to the first picture, to acquire a second common voltage according to the aging picture and the second picture, and to acquire a third common voltage and a fourth common voltage according to the black and white checkerboard picture and the third picture;

[0008] a processing module connected to the control module, the processing module being used to determine numerical relationships between the third common voltage, the fourth common voltage and the second common voltage respectively according to the second common voltage, the third common voltage and the fourth common voltage;

[0009] The regulating module is connected to the processing module and the display panel respectively, and is used to regulate the gamma voltages corresponding to the black and white images in the black and white chessboard image according to the numerical relationship determined by the processing module.

[0010] In a possible implementation, in the afterimage debugging device for the display panel provided in an embodiment of the present invention, the acquisition module is specifically used to acquire the first common voltage corresponding to the first picture when the flicker degree of the two preceding and succeeding frames is the lowest;

[0011] The acquisition module is specifically used to acquire the second common voltage corresponding to the second picture when the flickering degree of the two preceding and succeeding frames is the lowest;

[0012] The acquisition module is specifically used to acquire a third common voltage corresponding to the third picture displayed at the black chessboard position when the flickering degree of the previous and next two frames is the lowest, and is specifically used to acquire a fourth common voltage corresponding to the third picture displayed at the white chessboard position when the flickering degree of the previous and next two frames is the lowest;

[0013] The processing module is specifically used to determine a first difference between the third common voltage and the second common voltage, and to determine a second difference between the fourth common voltage and the second common voltage;

[0014] The adjustment module is specifically used to adjust the gamma voltage corresponding to the black picture in the black and white checkerboard picture according to the first difference, and is specifically used to adjust the gamma voltage corresponding to the white picture in the black and white checkerboard picture according to the second difference;

[0015] The regulating module is also used to regulate the common voltage of the display panel.

[0016] In a possible implementation, in the above-mentioned afterimage debugging device for a display panel provided by an embodiment of the present invention, the display panel includes a timing controller, and the control module is connected to the timing controller;

[0017] The control module includes a first memory, in which a first computer program is stored; the first computer program pre-stores the first picture, the second picture, the third picture, the aging picture and the black-and-white checkerboard picture; the control module is specifically used to control the timing controller to display the pre-stored first picture, the second picture, the third picture, the aging picture and the black-and-white checkerboard picture on the display panel through the I2C bus according to the first computer program.

[0018] In a possible implementation, in the above-mentioned afterimage debugging device for the display panel provided in an embodiment of the present invention, the processing module includes a second memory, on which a second computer program is stored; and the first difference and the second difference are stored in the second computer program.

[0019] In a possible implementation, in the above-mentioned afterimage debugging device for a display panel provided by an embodiment of the present invention, the display panel includes a voltage controller, and the adjustment module is connected to the voltage controller;

[0020] The adjustment module includes a third memory storing a third computer program; the adjustment module is specifically used to control the voltage controller to adjust the gamma voltage of the black and white picture in the black and white checkerboard picture through the I2C bus according to the third computer program.

[0021] In a possible implementation, in the above-mentioned afterimage debugging device for a display panel provided by an embodiment of the present invention, the adjustment module and the control module are integrated, and the internal circuit of the voltage controller is integrated into the timing controller.

[0022] In a possible implementation, in the above-mentioned afterimage debugging device for the display panel provided in an embodiment of the present invention, the acquisition module includes an optical detection device, and the control module is also used to control the placement of the optical fiber probe of the optical detection device at a preset position of the display panel.

[0023] Accordingly, an embodiment of the present invention further provides a method for debugging an afterimage of a display panel, comprising:

[0024] Controlling the display panel to display a first picture, and collecting a first common voltage corresponding to the first picture when the flickering degree of the two preceding and succeeding frames is the lowest;

[0025] Controlling the display panel to display an aging picture under the first common voltage, and after the display panel displays the aging picture for a preset time, controlling the display panel to display a second picture, and collecting a second common voltage corresponding to the second picture when the flickering degree of the two frames before and after the second picture is the lowest;

[0026] Controlling the display panel to display a black and white checkerboard picture under the first common voltage, and after the display panel displays the black and white checkerboard picture for a preset time, controlling the display panel to display a third picture, and collecting a third common voltage corresponding to the third picture displayed at the black checkerboard position when the flickering degree of the previous and next two frames is the lowest, and collecting a fourth common voltage corresponding to the third picture displayed at the white checkerboard position when the flickering degree of the previous and next two frames is the lowest;

[0027] Determine the numerical relationships between the third common voltage, the fourth common voltage and the second common voltage, and adjust the gamma voltages corresponding to the black and white images in the black and white checkerboard image according to the numerical relationships.

[0028] In a possible implementation, in the afterimage debugging method of the display panel provided in an embodiment of the present invention, controlling the display panel to display a first picture, and collecting a first common voltage corresponding to the first picture when the flicker degree of the previous and next two frames is the lowest, specifically includes:

[0029] Placing a fiber optic probe of an optical detection device at a preset position of the display panel;

[0030] Controlling the display panel to display a first picture, adjusting the common voltage of the display panel, and detecting the flickering degree of the first picture in two frames before and after by the optical detection device;

[0031] The first common voltage corresponding to the lowest flickering degree is collected.

[0032] In a possible implementation, in the afterimage debugging method of the display panel provided in the embodiment of the present invention, collecting the second common voltage corresponding to the second picture when the flicker degree of the previous and next two frames is the lowest specifically includes:

[0033] When displaying the second picture, adjusting the common voltage of the display panel, and detecting the flickering degree of the second picture in the two frames before and after by the optical detection device;

[0034] A second common voltage corresponding to the lowest flickering degree is collected.

[0035] In a possible implementation, in the afterimage debugging method of the display panel provided in an embodiment of the present invention, collecting the third common voltage corresponding to the third picture displayed at the black checkerboard position when the flicker degree of the previous and next two frames is the lowest specifically includes:

[0036] After the black and white chessboard image is displayed, placing the optical fiber probe of the optical detection device at the black chessboard at a preset position of the black and white chessboard image;

[0037] Controlling the display panel to display a third picture, adjusting the common voltage of the display panel, and detecting the flickering degree of the third picture displayed at the black checkerboard in the two frames before and after by the optical detection device;

[0038] The third common voltage corresponding to the lowest flickering degree is collected.

[0039] In a possible implementation, in the afterimage debugging method of the display panel provided in an embodiment of the present invention, collecting the fourth common voltage corresponding to the third picture displayed at the white chessboard position when the flickering degree of the previous and next two frames is the lowest specifically includes:

[0040] After the black and white chessboard image is displayed, placing the optical fiber probe of the optical detection device at the white chessboard at a preset position of the black and white chessboard image;

[0041] Controlling the display panel to display a third picture, adjusting the common voltage of the display panel, and detecting the flickering degree of the third picture displayed at the white chessboard in the two frames before and after by the optical detection device;

[0042] A fourth common voltage corresponding to the lowest flickering degree is collected.

[0043] In a possible implementation, in the afterimage debugging method of the display panel provided in an embodiment of the present invention, determining the numerical relationship between the third common voltage, the fourth common voltage and the second common voltage, and adjusting the gamma voltages corresponding to the black and white images in the black and white checkerboard image according to the numerical relationship, specifically includes:

[0044] determining a first difference between the third common voltage and the second common voltage, and determining a second difference between the fourth common voltage and the second common voltage;

[0045] If the first difference and the second difference are both smaller than a preset value, the third common voltage or the fourth common voltage is used as a final common voltage of the display panel;

[0046] If the absolute value of the first difference is greater than the preset value, the sum of the gamma voltage of the black screen in the black and white checkerboard screen displayed last time and the first difference is used as the gamma voltage of the black screen when the black and white checkerboard screen is displayed next time;

[0047] If the absolute value of the second difference is greater than the preset value, the sum of the gamma voltage of the white picture in the black and white checkerboard picture displayed last time and the second difference is used as the gamma voltage of the white picture when the black and white checkerboard picture is displayed next time;

[0048] Afterwards, the black and white checkerboard image and the third image are displayed continuously under the first common voltage using the re-determined black image gamma voltage and white image gamma voltage until both the first difference and the second difference are smaller than the preset value. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic diagram of a black and white chessboard image provided by an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of the pixel structure of the Flicker screen;

[0051] Figure 3A schematic diagram of the connection between a display panel afterimage debugging device and a display panel provided by an embodiment of the present invention;

[0052] Figure 4 A schematic diagram of a connection between another afterimage debugging device for a display panel and a display panel provided by an embodiment of the present invention;

[0053] Figure 5 A schematic diagram of a flow chart of an afterimage debugging device for a display panel provided by an embodiment of the present invention during an afterimage debugging process;

[0054] Figure 6 A schematic flow chart of a method for debugging an afterimage of a display panel provided by an embodiment of the present invention;

[0055] Figure 7 A schematic diagram of another flow chart of a method for debugging an afterimage of a display panel provided by an embodiment of the present invention;

[0056] Figure 8 A schematic diagram of another flow chart of a method for debugging an afterimage of a display panel provided by an embodiment of the present invention;

[0057] Fig. 9 A schematic diagram of another flow chart of a method for debugging an afterimage of a display panel provided by an embodiment of the present invention;

[0058] Fig.10 A schematic diagram of another flow chart of a method for debugging an afterimage of a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. And in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0060] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "include" or "comprise" and the like used in the present invention mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Inside", "outside", "upper", "lower", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0061] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual proportions, but are only intended to illustrate the content of the present invention. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0062] For liquid crystal display panels, the problem of afterimage is widely present in liquid crystal display panels due to the dielectric anisotropy of the liquid crystal itself and the easy polarization and charge accumulation of the liquid crystal material. The current debugging method for afterimage needs to debug the gamma voltage of the black and white checkerboard area according to the change of the Vcom (common voltage) value corresponding to the minimum flickering degree of the Flicker (flickering) image displayed before and after the afterimage debugging (displaying the black and white checkerboard image). The following is the existing afterimage debugging process:

[0063] After the new screen is powered on, the optical fiber probe of the optical detection equipment (CA310) is placed in the center of the display screen, and the screen is switched to the Flicker screen. The flicker level of the Flicker screen is quickly adjusted to the minimum, and the Vcom value at this time is recorded as V1. Then the screen is switched to the black and white checkerboard screen (such as Figure 1 After the afterimage debugging is completed, place the fiber optic probe of CA310 in the black checkerboard area in the center of the display screen, then switch to the Flicker screen, quickly adjust the flicker level of the Flicker screen to the minimum, and record the Vcom value at this time as V L0 The same method is used to measure the Vcom value of the white chessboard area corresponding to the lowest flicker level of the Flicker screen, which is recorded as V L255 Due to the characteristics of the liquid crystal itself and polarization problems, V L0 and V L255 will change relative to V1, so the gamma voltages of the black and white checkerboard regions need to move in the same direction by △(V L0 -V1)、△(V L255 -V1), adjust the black and white gamma voltage values ​​and continue to debug the afterimage until the gamma voltage is symmetrical and there is no afterimage.

[0064] The above-mentioned afterimage debugging does not take into account the problem of defective display panel ends. However, in the actual production process, the etching solution used to make TFT substrates cannot be guaranteed to be consumed before or during the shelf life. Some TFT substrates made with liquid at the end of the shelf life are prone to residual sand defects, which can easily lead to Flicker drift. Precisely because it is impossible to control the etching solution to be consumed in the early and middle stages, almost all panel products will have light or severe Flicker drift defects, and there are batch differences. At present, there is no very systematic afterimage debugging method for Flicker drift. When there is Flicker drift caused by screen defects, it is impossible to determine the Vcom value corresponding to the lowest flickering degree of the Flicker screen before the afterimage debugging. Therefore, the afterimage debugging cannot be accurately adjusted.

[0065] Take the display panel of the HADS series products with defective screen as an example:

[0066] like Figure 2 As shown, Figure 2 The pixel structure diagram of the Flicker screen is a 1V1H screen (also called skip1dot screen). In this screen, the flicker level is adjusted to the optimal level (about 4.0), and the corresponding Vcom is 6.922V; then, the screen is aged for 0.5h in the L255 screen, and after aging, it is switched to the Flicker screen. It is found that the flicker level of the Flicker screen drifts to 25, and the corresponding Vcom is 6.835V. If Vcom=6.835V is written into the screen and aging continues, it will be found that Flicker will drift. Therefore, due to the poor screen end of the display panel, Flicker will drift after each aging, so it is impossible to determine the optimal Vcom value before the residual image debugging, which makes it impossible to accurately adjust the residual image debugging.

[0067] In summary, the current conventional afterimage debugging methods are only applicable to products with no defects on the screen. For display panels with flicker drift caused by residual sand defects, it is impossible to determine the optimal Vcom value before afterimage debugging, resulting in basically blind adjustments during the afterimage debugging process.

[0068] In view of this, in order to solve the problem that afterimage adjustment cannot be accurately adjusted due to the existence of a defective screen end, an embodiment of the present invention provides a device for adjusting afterimage of a display panel, such as Figure 3 As shown, including:

[0069] The control module 1 is connected to the display panel (the timing controller and the voltage controller will be introduced later), and the control module 1 is used to control the display panel to display the first picture, the aging picture, the second picture, the black and white checkerboard picture and the third picture;

[0070] The acquisition module 2 is connected to the control module 1 and is used to acquire the first common voltage V1 according to the first picture and to acquire the second common voltage V according to the aging picture and the second picture. aging , and collecting the third common voltage V according to the black and white chessboard picture and the third picture L0 and the fourth common voltage V L255 ;

[0071] The processing module 3 is connected to the control module 1 and is used to generate a voltage according to the second common voltage V aging , the third common voltage V L0 and the fourth common voltage V L255 Determine the third common voltage V L0 , the fourth common voltage V L255 and the second common voltage V aging The numerical relationship between

[0072] The adjustment module 4 is connected to the processing module 3 and the display panel respectively. The adjustment module 4 is used to adjust the gamma voltage (GAM7 and GAM8) corresponding to the black picture and the gamma voltage (GAM1 and GAM14) corresponding to the white picture in the black and white checkerboard picture according to the numerical relationship determined by the processing module 3.

[0073] Specifically, the first picture, the second picture, and the third picture can all be Figure 2 The special pattern screen displayed under the pixel structure shown, for example, can be a skip1dot pattern screen with alternating light and dark. In this pixel structure, only the G sub-pixel is bright, and each row and each column are an alternating structure of light and dark. The skip1dotpattern screen is very likely to be polarized during long-term aging. When switching from the skip1dot pattern screen to other grayscale screens, the display screen will flicker poorly.

[0074] Specifically, the aged picture may be a white picture with a grayscale of L255.

[0075] In a specific implementation, in the above-mentioned afterimage debugging device of the display panel provided in an embodiment of the present invention, as Figure 3 As shown, the acquisition module 2 includes an optical detection device (CA310), which is mainly used to collect flicker degree data and common voltage values, and can output the common voltage value corresponding to the lowest flicker degree; the control module 1 is also used to control the placement of the optical fiber probe of the optical detection device at a preset position of the display panel.

[0076] In specific implementation, in the above-mentioned afterimage debugging device of the display panel provided in the embodiment of the present invention, afterimage debugging of the display panel can be performed through the control module 1, the acquisition module 2, the processing module 3 and the adjustment module 4. The specific debugging process is as follows:

[0077] (1) The control module 1 controls the optical fiber probe of the optical detection device (CA310) to be placed at a preset position of the display panel (preferably the center position of the display panel); the control module 1 controls the display surface to display the first picture, the adjustment module 4 adjusts the common voltage of the display panel, and the acquisition module 2 detects the flicker degree of the first picture in the two frames before and after the optical detection device to collect the first common voltage V1 corresponding to the lowest flicker degree.

[0078] (2) The control module 1 controls the display panel to display the aging picture (L255 white picture) under the first common voltage V1. After the display panel displays the aging picture for a preset time (for example, 0.5 hours), the control module 1 controls the display panel to display the second picture. The adjustment module 4 adjusts the common voltage of the display panel. The acquisition module 2 detects the flickering degree of the second picture in the two frames before and after through the optical detection device (CA310) to collect the second common voltage V corresponding to the lowest flickering degree. aging .

[0079] (3) The control module 1 controls the display panel to display a black and white checkerboard image under the first common voltage V1 (eg Figure 1 After the display panel displays the black and white chessboard picture for a preset time (e.g., 6 hours), the control module 1 controls the optical detection device (CA310) to place the optical fiber probe at the black chessboard at the preset position of the black and white chessboard picture, and controls the display panel to display the third picture, the adjustment module 4 adjusts the common voltage of the display panel, and the acquisition module 2 detects the optical detection device Figure 1 The third common voltage V corresponding to the lowest flickering degree is collected by measuring the flickering degree of the third picture displayed at the middle black chessboard position in the two frames before and after. L0 , and collected by the same method Figure 1 The fourth common voltage V corresponding to the third picture displayed at the middle white chessboard position when the flickering degree of the two frames before and after is the lowest L255 .

[0080] (4) Processing module 3 determines the third common voltage V L0 and the second common voltage V aging The first difference between △(V L0 -V aging ), and determine the fourth common voltage V L255 and the second common voltage V aging The second difference between △(V L255 -V aging ).

[0081] (5) The adjustment module 4 adjusts the first difference △(V L0 -V aging ) adjusts the gamma voltage (GAM7 and GAM8) corresponding to the black screen in the black and white checkerboard screen, and adjusts the gamma voltage (GAM7 and GAM8) corresponding to the black screen according to the second difference △ (V L255 -V aging ) adjusts the gamma voltage (GAM1 and GAM14) corresponding to the white image in the black and white checkerboard image.

[0082] Specifically, if the processing module 3 determines the first difference Δ(V L0 -V aging ) and the second difference △(V L255 -V aging ) are all smaller than a preset value (for example, the preset value is 0.01V), then the processing module 3 changes the third common voltage V L0 Or the fourth common voltage V L255 As the final common voltage of the display panel; it should be noted that in △ (V L0 -V aging ) and the absolute value of △(V L255 -V aging ) are all less than 0.01V, V L0 and V L255 It may be the same, or there may be some differences, but V L0 and V L255 are basically the same, so V L0 or V L255 As the final common voltage of the display panel.

[0083] If the processing module 3 determines the first difference △(V L0 -V aging ) is greater than the preset value (0.01V), the adjustment module 4 adjusts the gamma voltage (GAM7 and GAM8) of the black screen in the black and white chessboard screen displayed last time and the first difference △ (V L0 -V aging ) is used as the gamma voltage of the black screen when the black and white checkerboard screen is displayed next time; for example, the gamma voltages of the black screen during the first debugging are GAM7 and GAM8 respectively, and the first difference △(V L0 -V aging ) is 0.03V, a second debugging is required, that is, repeatedly displaying the black and white checkerboard picture and the third picture. At this time, the gamma voltages corresponding to the black pictures in the black and white checkerboard picture are GAM7+0.03V and GAM8+0.03V respectively.

[0084] If the processing module 3 determines the second difference △(V L255 -V aging) is greater than the preset value (0.01V), the adjustment module 4 adjusts the gamma voltage (GAM1 and GAM14) of the white screen in the black and white chessboard screen displayed last time and the second difference △ (V L255 -V aging ) is used as the gamma voltage of the white screen when the black and white checkerboard screen is displayed next time; for example, the gamma voltages of the white screen during the first debugging are GAM1 and GAM14 respectively, and the second difference △(V L255 -V aging ) is -0.02V, a second debugging is required, that is, repeatedly displaying the black and white checkerboard picture and the third picture. At this time, the gamma voltages corresponding to the white picture in the black and white checkerboard picture are GAM1-0.02V and GAM14-0.02V respectively.

[0085] Afterwards, the control module 1 continues to control the display panel to display the black and white checkerboard picture and the third picture by using the re-determined gamma voltage of the black picture (for example, GAM7+0.03V and GAM8+0.03V) and the gamma voltage of the white picture (GAM1-0.02V and GAM14-0.02V) under the first common voltage V1, and collects the corresponding V L0 and V L255 , until the processing module 3 determines the first difference △(V L0 -V aging ) and the second difference (V L255 -V aging ) are all smaller than the preset value (0.01V), and the afterimage debugging is completed.

[0086] The afterimage debugging device of the display panel provided by the embodiment of the present invention can realize the flicker drift caused by the defect of the screen end. aging Inside, by using V aging As the optimal Vcom before the afterimage test (displaying the black and white checkerboard screen), during the debugging process, the gamma voltage corresponding to the black and white screen in the black and white checkerboard screen is adjusted to be symmetrical in the two frames before and after. In the ideal state, that is, △(V L0 -V aging ) and △(V L255 -V aging ) are all 0, △(V L0 -V aging ) and the absolute value of △(V L255 -V aging ) is generally less than 0.01V. L0 -V aging ) and the absolute value of △(V L255 -V aging) are both greater than 0.01V, it is necessary to move the gamma voltages (GAM7 and GAM8) corresponding to the black screen in the black and white checkerboard screen in the same direction by △ (V L0 -V aging ), move the gamma voltages (GAM1 and GAM14) corresponding to the white image in the black and white checkerboard image in the same direction by △ (V L255 -V aging ), and then repeat the process of displaying the black and white chessboard screen and the third screen until △(V L0 -V aging ) and the absolute value of △(V L255 -V aging ) are all less than 0.01V, the final common voltage of the display panel and the gamma voltage corresponding to the black and white screen can be determined, and the residual image debugging is completed. aging As the optimal Vcom before the afterimage test, it can accurately debug the afterimage.

[0087] It should be noted that the gamma voltage is used to control the grayscale of the display. Generally, it is divided into GAM 0 ~ GAM 14. The voltage difference between different gamma voltages and Vcom voltages causes different liquid crystal rotation angles, thus forming differences in brightness. The best condition for Vcom voltage is to be located in the middle of GAM0 and GAM14, so that the flicker of the LCD screen will be the best. For example, two adjacent white frames are generally controlled by GAM1 and GAM14, and the difference between GAM1 and Vcom is required to be the same as the difference between GAM14 and Vcom; two adjacent black frames are generally controlled by GAM7 and GAM8, and the difference between GAM7 and Vcom is required to be the same as the difference between GAM8 and Vcom; the remaining GAMs control the remaining grayscales between black and white.

[0088] It should be noted that when the display panel is controlled to display the first picture, the second picture, the third picture, the aging picture and the black-and-white checkerboard picture, the common voltage used by the display panel is the first common voltage V1.

[0089] Specifically, when the display panel has no screen edge defect, the common voltage of the display panel after aging does not change and remains the first common voltage V1; when the display panel has a screen edge defect, the common voltage of the display panel after aging changes to the second common voltage V aging ; Therefore, V aging As the optimal Vcom before the afterimage test, the flicker drift caused by the screen defect can be reflected in V aging Inside, ensure accurate debugging of the afterimage.

[0090] Specifically, the first difference Δ(V L0 -V aging) and the second difference △(V L255 -V aging ), which can reflect the residual image problem caused by the dielectric anisotropy of the liquid crystal itself, the easy polarization and accumulation of charge of the liquid crystal material, and the poor screen end. Therefore, by adjusting the gamma voltage corresponding to the black screen, the first difference △ (V L0 -V aging ) is less than 0.01V, and the gamma voltage corresponding to the white screen is adjusted to make the second difference △(V L255 -V aging ) is less than 0.01V, which can eliminate the afterimage.

[0091] In a specific implementation, in the above-mentioned afterimage debugging device of the display panel provided in an embodiment of the present invention, as Figure 3 As shown, the display panel includes a timing controller 100 (TCON), and the control module 1 is connected to the timing controller 100;

[0092] The control module 1 may include a first memory, the first memory stores a first computer program, and the first computer program pre-stores a first picture, a second picture, a third picture, an aging picture, and a black and white checkerboard picture; the control module 1 is specifically used to control the timing controller 100 through the I2C bus according to the first computer program to display the pre-stored first picture, second picture, third picture, aging picture, and black and white checkerboard picture on the display panel. Specifically, the control module 1 can switch the display screen to a specific picture, such as a Flicker picture, L0, L255, an aging picture, a black and white checkerboard picture, etc., and the picture output time can also be controlled. The control module 1 can formulate a process, such as: after the afterimage debugging starts, cut the Flicker picture (first picture), cut the L255 picture 0.5h after collecting V1, and then cut the Flicker picture (second picture), collect V aging Then cut to the black and white chessboard picture 6h, and then cut to the Flicker picture (the third picture).

[0093] In a specific implementation, in the above-mentioned afterimage debugging device of the display panel provided in an embodiment of the present invention, as Figure 3 As shown, the processing module 3 includes a second memory, and the second memory stores a second computer program; the processing module 3 can L255 and V L0 With V aging Calculate and determine the first difference △(V L0 -V aging ) and the second difference △(V L255 -V aging ), the first difference △(V L0 -V aging ) and the second difference △(V L255 -Vaging ) is stored on a second computer program.

[0094] In a specific implementation, in the above-mentioned afterimage debugging device of the display panel provided in an embodiment of the present invention, as Figure 3 As shown, the display panel includes a voltage controller 200, and the regulating module 4 is connected to the voltage controller 200;

[0095] The adjustment module 4 includes a third memory, in which a third computer program is stored; the first difference △(V L0 -V aging ) and the second difference △(V L255 -V aging ) is input into the third computer program, and the adjustment module 4 is specifically used to adjust the common voltage of the display panel and the gamma voltage of the black and white picture in the black and white checkerboard picture through the I2C bus control voltage controller 200 according to the third computer program.

[0096] Specifically, the I2C (Inter Integrated Circuit) bus includes a data signal line and a common voltage line. Specifically, the control module 1 can control TCON to input the first picture, the second picture, the third picture, the aging picture and the black and white checkerboard picture to the display panel through the corresponding data signal line. Among them, the data signal line is used to transmit the first picture, the second picture, the third picture, the aging picture and the black and white checkerboard picture. The control module 1 can control the voltage controller 200 to adjust the common voltage of the display panel and the gamma voltage of the black and white picture in the black and white checkerboard picture through the corresponding data signal line.

[0097] In a specific implementation, in the above-mentioned afterimage debugging device of the display panel provided in an embodiment of the present invention, as Figure 3 As shown, since the adjustment module 4 is mainly used to adjust the gamma voltage and the common voltage, the adjustment module 4 and the control module 1 can be integrated (eg Figure 4 As shown,), that is Figure 4 The voltage controller 200 can be integrated into the timing controller 100. In this way, the first computer program in the first memory of the control module 1 can directly control and adjust the original internal circuit of the timing controller 100 and the voltage controller 200, thereby simplifying the afterimage debugging device of the display panel provided in the embodiment of the present invention.

[0098] Specifically, Figure 4 As shown, the control / regulation module integrates Figure 3 The control module 1 and the regulating module 4 shown, Figure 4It is required that the timing controller 100 integrates the voltage controller 200 on the basis of the original internal circuit. In this way, the first memory can be directly connected to the timing controller 100 through the I2C bus, and the screen displayed on the display panel can be switched through the original internal circuit of the timing controller 100; the first memory can also receive the data returned by the processing module 3, and adjust the gamma voltage and the common voltage through the voltage controller 200.

[0099] The present invention is as follows Figure 3 The afterimage debugging device of the display panel shown in the figure illustrates the role of each module in the afterimage debugging process and the afterimage debugging method using specific values, such as Figure 5 As shown, Figure 5 This is a flowchart of afterimage debugging. The specific afterimage debugging method is as follows:

[0100] (1) The control module 1 controls the display panel to display the Flicker picture (the first picture), the adjustment module 4 adjusts the common voltage of the display panel, and the acquisition module 2 acquires the first common voltage V1 corresponding to the first picture when the flicker degree of the two frames before and after is the lowest. For example, the first common voltage V1 is 6.922V, and the common voltage of the display panel is kept at 6.922V throughout the debugging process.

[0101] (2) The control module 1 controls the display panel to display the aging picture (e.g., the L255 white picture) for 0.5 h, and then controls the display panel to display the flicker picture (the second picture). The adjustment module 4 adjusts the common voltage of the display panel, and the acquisition module 2 acquires the second common voltage V corresponding to the second picture when the flicker degree of the previous and next two frames is the lowest. aging For example, the second common voltage V aging It is 6.835V.

[0102] (3) The control module 1 controls the display panel to display a black and white checkerboard image under the first common voltage V1 (eg Figure 1 The preset duration (e.g. 6h) is set.

[0103] (4) The control module 1 controls the fiber optic probe of CA310 to be placed at the black chessboard at the center of the black and white chessboard screen; the control module 1 controls the display panel to display the third screen, the adjustment module 4 adjusts the common voltage of the display panel, and the acquisition module 2 acquires the third common voltage V corresponding to the third screen displayed at the black chessboard when the flickering degree of the previous and next two frames is the lowest. L0 , and detecting the flickering degree of the third picture displayed at the white chessboard at the center of the display panel in the two frames before and after to collect the fourth common voltage V corresponding to the lowest flickering degree L255 For example, the third common voltage V L0 is 6.864V, and the fourth common voltage V L255It is 6.791V.

[0104] (5) Processing module 3 determines the third common voltage V L0 and the second common voltage V aging The first difference between △(V L0 -V aging )=6.864V-6.835V=0.029V, and determine the fourth common voltage V L255 and the second common voltage V aging The second difference between △(V L255 -V aging )=6.791V-6.835V=-0.044V.

[0105] (6) Due to △(V L0 -V aging ) and the absolute value of △(V L255 -V aging ) are all greater than 0.01V, the adjustment module 4 adjusts GAM1, GAM14 corresponding to the white chessboard area and GAM7, GAM8 corresponding to the black chessboard area. For example, before adjustment, GAM1 / GAM14=14.364V / 0.56V, before adjustment, GAM7 / GAM8=7.879V / 7.274V, then after adjustment, GAM1 / GAM14=14.32V / 0.516V, after adjustment, GAM7 / GAM8=7.908V / 7.303V, then steps (3) to (5) are repeated with the adjusted GAM1 / GAM14 and GAM7 / GAM8 until △(V L0 -V aging ) and the absolute value of △(V L255 -V aging ) are all less than 0.01V, and the afterimage debugging is completed.

[0106] It should be noted that the afterimage debugging process in step (6) above is based on △(V L0 -V aging ) and the absolute value of △(V L255 -V aging ) are all greater than 0.01V, the gamma voltage of the black and white screen needs to be adjusted at the same time; of course, during the debugging process, it may also be △(V L0 -V aging ) is less than 0.01V, while △(V L255 -V aging ) is greater than 0.01V, the gamma voltage of the black screen does not need to be adjusted, only the gamma voltage of the white screen needs to be adjusted; it may also be △(V L255 -V aging) is less than 0.01V, while △(V L0 -V aging ) is greater than 0.01V, the gamma voltage of the white screen does not need to be adjusted, and only the gamma voltage of the black screen needs to be adjusted.

[0107] Based on the same inventive concept, an embodiment of the present invention further provides a method for debugging an afterimage of a display panel. Figure 6 As shown, including:

[0108] S601, controlling the display panel to display a first picture, and collecting a first common voltage corresponding to the first picture when the flickering degree of the two preceding and succeeding frames is the lowest;

[0109] S602, controlling the display panel to display an aged picture under a first common voltage, and after the display panel displays the aged picture for a preset time, controlling the display panel to display a second picture, and collecting a second common voltage corresponding to the second picture when the flickering degree of the two preceding and succeeding frames is the lowest;

[0110] S603, controlling the display panel to display a black and white checkerboard picture under the first common voltage, and after the display panel displays the black and white checkerboard picture for a preset time, controlling the display panel to display a third picture, and collecting a third common voltage corresponding to the third picture displayed at the black checkerboard position when the flickering degree of the previous and next two frames is the lowest, and collecting a fourth common voltage corresponding to the third picture displayed at the white checkerboard position when the flickering degree of the previous and next two frames is the lowest;

[0111] S604, determining the numerical relationships between the third common voltage, the fourth common voltage and the second common voltage respectively, and adjusting the gamma voltages corresponding to the black and white images in the black and white checkerboard image according to the numerical relationships.

[0112] The afterimage debugging method of the above-mentioned display panel provided by the embodiment of the present invention adopts the second common voltage as the optimal Vcom before the afterimage test, determines the numerical relationship between the third common voltage, the fourth common voltage and the second common voltage respectively, and adjusts the gamma voltage corresponding to the black and white images in the black and white checkerboard image according to the numerical relationship, so as to accurately debug the afterimage.

[0113] In specific implementation, in the above-mentioned display panel afterimage debugging method provided in an embodiment of the present invention, the display panel is controlled to display a first picture, and a first common voltage corresponding to the first picture when the flicker degree of the two preceding and succeeding frames is the lowest is collected, such as Figure 7 As shown, it may specifically include:

[0114] S701, placing a fiber optic probe of an optical detection device at a preset position of a display panel;

[0115] S702, controlling the display panel to display the first picture, adjusting the common voltage of the display panel, and detecting the flickering degree of the first picture in the two preceding and following frames by an optical detection device;

[0116] S703: Collect the first common voltage corresponding to the lowest flicker level.

[0117] In specific implementation, in the afterimage debugging method of the display panel provided in the embodiment of the present invention, the second common voltage corresponding to the second picture when the flicker degree of the previous and next two frames is the lowest is collected, such as Figure 8 As shown, it may specifically include:

[0118] S801, when displaying a second picture, adjusting the common voltage of the display panel, and detecting the flickering degree of the second picture in two frames before and after by an optical detection device;

[0119] S802: Collect a second common voltage corresponding to the lowest flicker level.

[0120] In specific implementation, in the afterimage debugging method of the display panel provided in the embodiment of the present invention, the third common voltage corresponding to the third picture displayed at the black chessboard position when the flickering degree of the previous and next two frames is the lowest is collected, such as Fig. 9 As shown, it may specifically include:

[0121] S901, after the black and white chessboard image is displayed, placing the optical fiber probe of the optical detection device at the black chessboard at a preset position of the black and white chessboard image;

[0122] S902, controlling the display panel to display the third picture, adjusting the common voltage of the display panel, and detecting the flickering degree of the third picture displayed at the black chessboard in the two preceding and following frames by an optical detection device;

[0123] S903, collecting a third common voltage corresponding to the lowest flickering level.

[0124] In a specific implementation, in the afterimage debugging method of the display panel provided in the embodiment of the present invention, the fourth common voltage corresponding to the third picture displayed at the white chessboard position when the flickering degree of the previous and next two frames is the lowest is collected, such as Fig.10 As shown, it may specifically include:

[0125] S1001, after the black and white chessboard image is displayed, placing the optical fiber probe of the optical detection device at the white chessboard at a preset position of the black and white chessboard image;

[0126] S1002, controlling the display panel to display the third picture, adjusting the common voltage of the display panel, and detecting the flickering degree of the third picture displayed at the white chessboard in the two preceding and following frames by an optical detection device;

[0127] S1003, collecting a fourth common voltage corresponding to the lowest flickering level.

[0128] In a specific implementation, in the afterimage debugging method of the display panel provided in the embodiment of the present invention, determining the numerical relationship between the third common voltage, the fourth common voltage and the second common voltage, respectively, and adjusting the gamma voltages corresponding to the black and white images in the black and white checkerboard image according to the numerical relationship, specifically includes:

[0129] determining a first difference between the third common voltage and the second common voltage, and determining a second difference between the fourth common voltage and the second common voltage;

[0130] If the absolute value of the first difference and the absolute value of the second difference are both smaller than the preset value, the third common voltage or the fourth common voltage is used as the final common voltage of the display panel;

[0131] If the absolute value of the first difference is greater than the preset value, the sum of the gamma voltage of the black screen in the black and white checkerboard screen displayed last time and the first difference is used as the gamma voltage of the black screen when the black and white checkerboard screen is displayed next time;

[0132] If the absolute value of the second difference is greater than the preset value, the sum of the gamma voltage of the white screen in the black and white checkerboard screen displayed last time and the second difference is used as the gamma voltage of the white screen when the black and white checkerboard screen is displayed next time;

[0133] Afterwards, the black and white checkerboard image and the third image are displayed under the first common voltage using the re-determined black image gamma voltage and white image gamma voltage until the absolute value of the first difference and the absolute value of the second difference are both smaller than the preset value.

[0134] Specifically, the afterimage debugging method of the above-mentioned display panel provided by an embodiment of the present invention is the same as the afterimage debugging principle disclosed in the afterimage debugging device of the aforementioned display panel. The specific afterimage debugging process can be referred to the description of the afterimage debugging in the afterimage debugging device of the aforementioned display panel, and will not be repeated here.

[0135] Based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the steps of any of the above-mentioned display panel afterimage debugging methods provided by the embodiment of the present invention are implemented. Specifically, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program codes.

[0136] Based on the same inventive concept, an embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps of the afterimage debugging method of any one of the display panels provided in the embodiments of the present invention are implemented.

[0137] The embodiment of the present invention provides a display panel afterimage debugging device and debugging method. The flicker drift caused by the screen end defect has been reflected in V aging Inside, by using V aging As the optimal Vcom before the afterimage test (displaying the black and white checkerboard screen), during the debugging process, the gamma voltage corresponding to the black and white screen in the black and white checkerboard screen is adjusted to be symmetrical in the two frames before and after. In an ideal state, △(V L0 -V aging ) and △(V L255 -V aging ) are all 0, △(V L0 -V aging ) and the absolute value of △(V L255 -V aging ) is generally less than 0.01V. L0 -V aging ) and the absolute value of △(V L255 -V aging ) are both greater than 0.01V, it is necessary to move the gamma voltages (GAM7 and GAM8) corresponding to the black screen in the black and white checkerboard screen in the same direction by △ (V L0 -V aging ), move the gamma voltages (GAM1 and GAM14) corresponding to the white image in the black and white checkerboard image in the same direction by △ (V L255 -V aging ), and then repeat the process of displaying the black and white chessboard screen and the third screen until △(V L0 -V aging ) and the absolute value of △(V L255 -V aging ) are all less than 0.01V, the final common voltage of the display panel and the gamma voltage corresponding to the black and white screen can be determined, and the residual image debugging is completed. aging As the optimal Vcom before the afterimage test, it can accurately debug the afterimage.

[0138] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0139] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A device for debugging afterimage of a display panel, characterized in that: include: A control module connected to the display panel, the control module is used to control the display panel to display a first picture, the common voltage corresponding to the first picture when the flicker degree of the two frames before and after the first picture is the lowest is the first common voltage; the control module is used to control the display panel to display an aging picture under the first common voltage; The control module is used to control the display panel to display a second picture after displaying the aging picture for a preset time, and the common voltage corresponding to the second picture when the flickering degree of the previous and next frames is the second common voltage; the control module is used to control the display panel to display a black and white checkerboard picture under the first common voltage; the control module is used to control the display panel to display a third picture after displaying the black and white checkerboard picture for a preset time, wherein the common voltage corresponding to the third picture displayed at the black checkerboard position when the flickering degree of the previous and next frames is the third common voltage, and the common voltage corresponding to the third picture displayed at the white checkerboard position when the flickering degree of the previous and next frames is the fourth common voltage; an acquisition module, connected to the control module, and configured to acquire the first common voltage, the second common voltage, the third common voltage, and the fourth common voltage; a processing module connected to the control module, the processing module being used to determine numerical relationships between the third common voltage, the fourth common voltage and the second common voltage respectively according to the second common voltage, the third common voltage and the fourth common voltage; The regulating module is connected to the processing module and the display panel respectively, and is used to regulate the gamma voltages corresponding to the black picture and the white picture in the black and white chessboard picture according to the numerical relationship determined by the processing module.

2. The afterimage debugging device of a display panel according to claim 1, characterized in that: The processing module is specifically used to determine a first difference between the third common voltage and the second common voltage, and to determine a second difference between the fourth common voltage and the second common voltage; The adjustment module is specifically used to adjust the gamma voltage corresponding to the black picture in the black and white checkerboard picture according to the first difference, and is specifically used to adjust the gamma voltage corresponding to the white picture in the black and white checkerboard picture according to the second difference; The regulating module is also used to regulate the common voltage of the display panel.

3. The afterimage debugging device of a display panel according to claim 2, characterized in that: The display panel includes a timing controller, and the control module is connected to the timing controller; The control module includes a first memory, in which a first computer program is stored; the first computer program pre-stores the first picture, the second picture, the third picture, the aging picture and the black-and-white checkerboard picture; the control module is specifically used to control the timing controller to display the pre-stored first picture, the second picture, the third picture, the aging picture and the black-and-white checkerboard picture on the display panel through the I2C bus according to the first computer program.

4. The afterimage debugging device for a display panel according to claim 3, characterized in that: The processing module includes a second memory, in which a second computer program is stored; the second computer program stores the first difference and the second difference.

5. The afterimage debugging device of a display panel according to claim 4, characterized in that: The display panel includes a voltage controller, and the regulating module is connected to the voltage controller; The adjustment module includes a third memory storing a third computer program; the adjustment module is specifically used to control the voltage controller to adjust the gamma voltage of the black screen and the white screen in the black and white checkerboard screen through the I2C bus according to the third computer program.

6. The afterimage debugging device of a display panel according to claim 5, characterized in that: The regulating module is integrated with the control module, and the internal circuit of the voltage controller is integrated in the timing controller.

7. The afterimage debugging device for a display panel according to any one of claims 1 to 6, characterized in that: The acquisition module includes an optical detection device, and the control module is further used to control the optical fiber probe of the optical detection device to be placed at a preset position of the display panel.

8. A method for debugging afterimage of a display panel, characterized in that: include: Controlling the display panel to display a first picture, and collecting a first common voltage corresponding to the first picture when the flickering degree of the two preceding and succeeding frames is the lowest; Controlling the display panel to display an aging picture under the first common voltage, and after the display panel displays the aging picture for a preset time, controlling the display panel to display a second picture, and collecting a second common voltage corresponding to the second picture when the flickering degree of the two frames before and after the second picture is the lowest; Controlling the display panel to display a black and white checkerboard picture under the first common voltage, and after the display panel displays the black and white checkerboard picture for a preset time, controlling the display panel to display a third picture, and collecting a third common voltage corresponding to the third picture displayed at the black checkerboard position when the flickering degree of the previous and next two frames is the lowest, and collecting a fourth common voltage corresponding to the third picture displayed at the white checkerboard position when the flickering degree of the previous and next two frames is the lowest; Determine the numerical relationships between the third common voltage, the fourth common voltage and the second common voltage, respectively, and adjust the gamma voltages corresponding to the black picture and the white picture in the black and white checkerboard picture according to the numerical relationships.

9. The method for debugging the afterimage of a display panel according to claim 8, characterized in that: Controlling the display panel to display a first picture, and collecting a first common voltage corresponding to when the flickering degree of the first picture is the lowest between two frames before and after the first picture, specifically includes: Placing a fiber optic probe of an optical detection device at a preset position of the display panel; Controlling the display panel to display a first picture, adjusting the common voltage of the display panel, and detecting the flickering degree of the first picture in two frames before and after by the optical detection device; The first common voltage corresponding to the lowest flickering degree is collected.

10. The method for debugging the afterimage of a display panel according to claim 8, wherein: Collecting the second common voltage corresponding to the second picture when the flickering degree of the two preceding and succeeding frames is the lowest specifically includes: When displaying the second picture, adjusting the common voltage of the display panel, and detecting the flickering degree of the second picture in the two frames before and after by an optical detection device; A second common voltage corresponding to the lowest flickering degree is collected.

11. The method for debugging the afterimage of a display panel according to claim 8, characterized in that: Collecting the third common voltage corresponding to the third picture displayed at the black chessboard position when the flickering degree of the previous and next two frames is the lowest specifically includes: After the black and white chessboard image is displayed, placing the optical fiber probe of the optical detection device at the black chessboard at a preset position of the black and white chessboard image; Controlling the display panel to display a third picture, adjusting the common voltage of the display panel, and detecting the flickering degree of the third picture displayed at the black checkerboard in the two frames before and after by the optical detection device; The third common voltage corresponding to the lowest flickering degree is collected.

12. The method for debugging the afterimage of a display panel according to claim 8, wherein: Collecting the fourth common voltage corresponding to the third picture displayed at the white chessboard position when the flickering degree of the previous and next two frames is the lowest specifically includes: After the black and white chessboard image is displayed, placing the optical fiber probe of the optical detection device at the white chessboard at a preset position of the black and white chessboard image; Controlling the display panel to display a third picture, adjusting the common voltage of the display panel, and detecting the flickering degree of the third picture displayed at the white chessboard in the two frames before and after by the optical detection device; A fourth common voltage corresponding to the lowest flickering degree is collected.

13. The method for debugging the afterimage of a display panel according to claim 8, wherein: Determining the numerical relationships between the third common voltage, the fourth common voltage and the second common voltage respectively, and adjusting the gamma voltages corresponding to the black picture and the white picture in the black and white checkerboard picture according to the numerical relationships, specifically includes: determining a first difference between the third common voltage and the second common voltage, and determining a second difference between the fourth common voltage and the second common voltage; If the first difference and the second difference are both smaller than a preset value, the third common voltage or the fourth common voltage is used as a final common voltage of the display panel; If the absolute value of the first difference is greater than the preset value, the sum of the gamma voltage of the black screen in the black and white checkerboard screen displayed last time and the first difference is used as the gamma voltage of the black screen when the black and white checkerboard screen is displayed next time; If the absolute value of the second difference is greater than the preset value, the sum of the gamma voltage of the white picture in the black and white checkerboard picture displayed last time and the second difference is used as the gamma voltage of the white picture when the black and white checkerboard picture is displayed next time; Afterwards, the black and white checkerboard image and the third image are displayed continuously under the first common voltage using the re-determined black image gamma voltage and white image gamma voltage until both the first difference and the second difference are smaller than the preset value.

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