Gray scale adjusting method of display panel and display device

Abstract

The application discloses a gray scale debugging method of a display panel and a display device. The gray scale debugging method of the display panel comprises the following steps: acquiring a gamma adjustment gray scale table; acquiring a compensation gray scale corresponding to a first binding point gray scale of brightness compensation according to the gamma adjustment gray scale table; acquiring an initial gray scale compensation table corresponding to the compensation gray scale; and acquiring a target gray scale compensation table of the first binding point gray scale according to the gamma adjustment gray scale table and the initial gray scale compensation table corresponding to the compensation gray scale. The application can improve the influence of gamma adjustment on the brightness compensation effect without affecting the gamma adjustment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a gray scale debugging method of display panel and display device. BACKGROUND

[0002] With the progress of science and technology, liquid crystal display panels have been widely used in various fields due to their advantages such as light weight, low power consumption, and no radiation. For liquid crystal display panels, there is usually a problem of display unevenness (mura). Common mura can be divided into line mura, block mura, and planar mura. In response to these problems, a brightness compensation algorithm (Demura compensation) has emerged. At the same time, in order to ensure that the gamma value of the display panel meets the target gamma curve, a gamma adjustment algorithm is also needed to adjust the gamma of the display panel. Generally, gamma adjustment is performed after Demura compensation, and gamma adjustment will cause the gray scale after gamma compensation to deviate, thereby causing the Demura compensation to deviate from the original compensation effect, and making the Demura compensation effect worse. SUMMARY

[0003] The present application provides a gray scale debugging method of display panel and display device to solve the technical problem that the Demura compensation effect is affected by gamma adjustment after Demura compensation in the prior art.

[0004] The present application provides a gray scale debugging method of display panel, which comprises:

[0005] obtaining a gamma adjustment gray scale table;

[0006] obtaining a compensation gray scale corresponding to a first binding point gray scale of brightness compensation according to the gamma adjustment gray scale table;

[0007] obtaining an initial gray scale compensation table corresponding to the compensation gray scale;

[0008] obtaining a target gray scale compensation table of the first binding point gray scale according to the gamma adjustment gray scale table and the initial gray scale compensation table corresponding to the compensation gray scale.

[0009] Optionally, in some embodiments of the present application, the step of obtaining the gamma adjustment gray scale table further comprises:

[0010] obtaining an initial gray scale compensation table corresponding to the first binding point gray scale.

[0011] Optionally, in some embodiments of the present application, the step of obtaining the initial gray scale compensation table corresponding to the compensation gray scale comprises:

[0012] obtaining an initial gray scale compensation table corresponding to the lowest gray scale;

[0013] According to the initial gray scale compensation table corresponding to the first bind point gray scale and the initial gray scale compensation table corresponding to the lowest gray scale, an initial gray scale compensation table corresponding to the compensation gray scale is obtained.

[0014] Optionally, in some embodiments of the present application, the initial gray scale compensation table corresponding to the first bind point gray scale and the initial gray scale compensation table corresponding to the lowest gray scale are subjected to interpolation processing to obtain the initial gray scale compensation table corresponding to the compensation gray scale.

[0015] Optionally, in some embodiments of the present application, the step of obtaining the initial gray scale compensation table corresponding to the first bind point gray scale comprises:

[0016] A plurality of the first bind point gray scales are set, and each of the first bind point gray scales is subjected to brightness compensation to obtain an initial gray scale compensation table corresponding to each of the first bind point gray scales.

[0017] Optionally, in some embodiments of the present application, the step of obtaining the gamma adjustment gray scale table comprises:

[0018] According to the target gamma curve, the display panel is subjected to gamma adjustment to obtain the gamma adjustment gray scale table.

[0019] Optionally, in some embodiments of the present application, the gamma adjustment gray scale table comprises a plurality of second bind point gray scales and a plurality of compensation gray scales corresponding to the plurality of second bind point gray scales one by one; and the step of obtaining the target gray scale compensation table of the first bind point gray scale according to the gamma adjustment gray scale table and the initial gray scale compensation table corresponding to the compensation gray scale comprises:

[0020] In the gamma adjustment gray scale table, the second bind point gray scale corresponding to each gray scale in the initial gray scale compensation table corresponding to the compensation gray scale is searched, and each gray scale in the initial gray scale compensation table corresponding to the compensation gray scale is replaced according to the second bind point gray scale to obtain the target gray scale compensation table.

[0021] Optionally, in some embodiments of the present application, after the step of obtaining the target gray scale compensation table of the first bind point gray scale according to the gamma adjustment gray scale table and the initial gray scale compensation table corresponding to the compensation gray scale, the method further comprises:

[0022] According to the target gray scale compensation table, the display panel is subjected to brightness compensation.

[0023] According to the gamma adjustment gray scale table, the display panel is subjected to gamma adjustment.

[0024] Correspondingly, the present application also provides a display device comprising a display panel and a driving module, wherein the driving module adopts the gray scale debugging method of the display panel according to any one of the above-mentioned embodiments to compensate the display panel.

[0025] Optionally, in some embodiments of the present application, the driving module comprises a timing controller, and the gamma adjustment gray scale table and the target gray scale compensation table are stored in the timing controller.

[0026] The present application discloses a gray scale debugging method of a display panel and a display device. The gray scale debugging method of the display panel comprises: obtaining a gamma adjustment gray scale table; obtaining a compensation gray scale corresponding to a first binding point gray scale with brightness compensation according to the gamma adjustment gray scale table; obtaining an initial gray scale compensation table corresponding to the compensation gray scale; and obtaining a target gray scale compensation table of the first binding point gray scale according to the gamma adjustment gray scale table and the initial gray scale compensation table corresponding to the compensation gray scale. The present application adjusts the initial gray scale compensation table of the first binding point gray scale obtained by brightness compensation (Demura compensation) by using the gamma adjustment gray scale table, so that the compensation effect of the first binding point gray scale after Demura compensation and gamma adjustment is consistent with the effect of the corresponding compensation gray scale after Demura compensation, thereby ensuring the consistency of the Demura compensation effect after gamma adjustment and the Demura initial compensation effect, and improving the influence of gamma adjustment on the Demura compensation effect without affecting the gamma adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0028] Figure 1 is a first data simulation schematic diagram of the gray scale debugging method of the display panel provided by the present application;

[0029] Figure 2 is a flowchart of the gray scale debugging method of the display panel provided by the present application;

[0030] Figure 3 is a second data simulation schematic diagram of the gray scale debugging method of the display panel provided by the present application;

[0031] Figure 4 is a structural schematic diagram of the display device provided by the present application. DETAILED DESCRIPTION

[0032] With reference to the drawings and the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work are within the protection scope of the present application.

[0033] In the description of the present application, it should be understood that the terms "first" and "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features, and therefore cannot be understood as a limitation on the present application. In addition, the term "a plurality of" refers to two or more.

[0034] The present application provides a gray scale debugging method of a display panel and a display device, which will be described in detail below. It should be noted that the description order of the following embodiments is not a limitation on the preferred order of the embodiments of the present application.

[0035] Please refer to Figure 1 , Figure 1 is the first data simulation schematic diagram of the gray scale debugging method of the display panel provided by the present application. As Figure 1 indicated, the embodiments of the present application take the first binding point gray scale of gray scale 100 as an example for description, but this cannot be understood as a limitation on the present application.

[0036] The initial gray scale table corresponding to the first binding point gray scale is represented as: before Demura compensation, when the display panel displays a single gray scale picture of the first binding point gray scale 100, the display gray scale of each sub-region is 100. The display area of the display panel can be divided into a plurality of sub-regions, and each sub-region can include the same number of sub-pixels, which will not be described in detail here.

[0037] Due to the numerous and complex manufacturing processes of the panel, each manufacturing process may cause the display panel to have mura problems due to improper operation. Therefore, Demura compensation needs to be performed on the display panel. After Demura compensation, the initial gray scale compensation table corresponding to the first binding point gray scale can be obtained. It should be noted that in Figure 1 , the initial gray scale compensation table corresponding to the first binding point gray scale is only taken as an example for description that the first binding point gray scale of 100 corresponding to two sub-regions is changed to gray scale 90 and gray scale 110 respectively, but this cannot be understood as a limitation on the present application.

[0038] After the Demura compensation, in order to ensure that the gamma curve of the display panel conforms to the target gamma curve, it is also necessary to perform gamma adjustment on the display panel according to the gamma adjustment gray scale table. For example, assuming that the second anchor point gray scales are set to 80, 90, 100, 105, and 110, after the gamma adjustment, the compensation gray scales of the second anchor point gray scales 80, 90, 100, 105, and 110 are 74.7, 79, 83, 91.3, and 102 respectively. Thus, the gamma adjustment gray scale table is obtained. The compensation gray scales of the non-second anchor point gray scales can be obtained by interpolation of the compensation gray scales of the second anchor point gray scales, which will not be described in detail herein. It should be noted that the gray scale is usually an integer, and the case of the gray scale being a decimal number in the embodiments of the present application is only for illustration and should not be construed as a limitation of the present application.

[0039] It can be seen that, after the Demura compensation and the gamma adjustment, since the first anchor point gray scale 100 corresponds to the second anchor point gray scale 100, the compensation gray scale of the first anchor point gray scale 100 is the gray scale 83. Therefore, the gray scale table of the first anchor point gray scale 100 after the gamma adjustment is equivalent to the initial gray scale compensation table of the gray scale 83 (the compensation gray scale 83) after the Demura compensation. However, for the same sub-region, the gray scale 74.7 and the gray scale 91.3 in the initial gray scale compensation table corresponding to the compensation gray scale 83 are quite different from the gray scale 79 and the gray scale 102 in the gray scale table after the gamma adjustment. Therefore, the gamma adjustment causes the Demura compensation to deviate from the original compensation effect.

[0040] To this end, the embodiments of the present application provide a gray scale debugging method of a display panel. The gray scale debugging method of the display panel comprises: obtaining a gamma adjustment gray scale table; obtaining a compensation gray scale corresponding to a first anchor point gray scale according to the gamma adjustment gray scale table; obtaining an initial gray scale compensation table corresponding to the compensation gray scale; and obtaining a target gray scale compensation table of the first anchor point gray scale according to the gamma adjustment gray scale table and the initial gray scale compensation table corresponding to the compensation gray scale.

[0041] The embodiments of the present application adjust the initial gray scale compensation table corresponding to the first anchor point gray scale obtained by the brightness compensation (Demura compensation) by using the gamma adjustment gray scale table, so that the compensation effect of the first anchor point gray scale after the Demura compensation and the gamma adjustment is consistent with the effect of the corresponding compensation gray scale after the Demura compensation, thereby ensuring the consistency of the Demura compensation effect after the gamma adjustment and the Demura initial compensation effect, and improving the influence of the gamma adjustment on the Demura compensation effect without affecting the gamma adjustment.

[0042] The following will be described in detail.

[0043] Please refer to Figure 2 and Figure 3 , Figure 2is a flowchart of a method for adjusting a gray scale of a display panel provided by the present application; Figure 3 is a second data simulation diagram of a method for adjusting a gray scale of a display panel provided by the present application. The method for adjusting a gray scale of the display panel 10 includes the following steps:

[0044] S1, obtaining a gamma-adjusted gray scale table.

[0045] The gamma-adjusted gray scale table can include a plurality of second binding point gray scales and a plurality of compensation gray scales corresponding to the plurality of second binding point gray scales. For example, as shown in the table, the compensation gray scales of the second binding point gray scales 80, 90, 100, 105, and 110 are 74.7, 79, 83, 91.3, and 102, respectively. For non-second binding point gray scales, the corresponding compensation gray scales can be obtained by interpolating and fitting the compensation gray scales of the second binding point gray scales. Figure 3

[0046] Specifically, in some embodiments of the present application, the second binding point gray scales can be adjusted according to a target gamma curve to obtain a gamma-adjusted gray scale table.

[0047] For example, the actual display brightness of the display panel at the second binding point gray scales can be tested, and the second binding point gray scales can be adjusted according to the actual display brightness to obtain compensation gray scales, so that the actual display brightness of the display panel and the compensation gray scales conform to the target gamma curve, thereby obtaining a gamma-adjusted gray scale table.

[0048] It can be understood that the brightness perceived by the human eye and the actual display brightness of the display panel are not in a linear relationship. In a low brightness environment, the human eye is more sensitive to changes in brightness, and in a high brightness environment, the human eye is less sensitive to changes in brightness. This characteristic of the human eye is called gamma characteristic. Due to the non-linear perception of brightness by the human eye, if we need to obtain a uniform change in brightness perception, the brightness displayed by the display panel needs to be non-uniformly changed to adapt to the gamma characteristic of the human eye. Therefore, if the brightness and the gray scale of the display panel do not conform to the target gamma curve, the gamma voltage of the display panel needs to be corrected.

[0049] In embodiments of the present application, the target gamma curve can be a gamma curve with a gamma parameter of 2.2. Of course, the present application is not limited thereto.

[0050] In some embodiments of the present application, before step S1, the method further includes: obtaining an initial gray scale compensation table corresponding to the first binding point gray scale.

[0051] For example, a plurality of first binding point gray scales can be set. The brightness of each first binding point gray scale is compensated to obtain an initial gray scale compensation table corresponding to each first binding point gray scale.

[0052] ​Specifically, the display panel can be divided into a plurality of sub-regions. Display brightness data of the display panel at a same first binding point gray scale is obtained. A center brightness of the display panel and an actual brightness corresponding to each sub-region are obtained according to the display brightness data. The center brightness is compared with the actual brightness corresponding to each sub-region for compensation, so as to obtain an initial gray scale compensation table corresponding to the first binding point gray scale. The above steps can be repeated to obtain an initial gray scale compensation table corresponding to each first binding point gray scale.

[0053] S2, a compensation gray scale corresponding to the first binding point gray scale for brightness compensation is obtained according to the gamma adjustment gray scale table.

[0054] In the brightness compensation of the display panel, a plurality of first binding point gray scales are usually set. For example, three first binding point gray scales are set. The first binding point gray scale for brightness compensation can be the same as or different from the second binding point gray scale in the gamma adjustment gray scale table.

[0055] After the gamma adjustment gray scale table is obtained, if the first binding point gray scale for brightness compensation is the same as the second binding point gray scale in the gamma adjustment gray scale table, the compensation gray scale corresponding to the first binding point gray scale for brightness compensation can be directly found in the gamma adjustment gray scale table. If the first binding point gray scale for brightness compensation is different from the second binding point gray scale in the gamma adjustment gray scale table, the corresponding compensation gray scale in the gamma adjustment gray scale table can be interpolated to obtain the compensation gray scale corresponding to the first binding point gray scale for brightness compensation.

[0056] S3, an initial gray scale compensation table corresponding to the compensation gray scale is obtained.

[0057] It can be understood that, before the gamma adjustment of the display panel, the brightness compensation of the display panel is needed. In the brightness compensation of the display panel, each first binding point gray scale corresponds to an initial gray scale compensation table. According to the first binding point gray scale for brightness compensation and the corresponding initial gray scale compensation table, the initial gray scale compensation table corresponding to the compensation gray scale can be obtained. It should be noted that, in the actual compensation process of the display panel, the step of obtaining the gamma adjustment gray scale table is performed before the step of obtaining the initial gray scale compensation table corresponding to the binding point gray scale. In the embodiments of the present application, “before the gamma adjustment of the display panel, the brightness compensation of the display panel is needed” means that, after the gamma adjustment gray scale table and the initial gray scale compensation table corresponding to the binding point gray scale are obtained, the time sequence controller first performs the brightness compensation of the display panel according to the initial gray scale compensation table corresponding to the binding point gray scale, and then performs the gamma adjustment of the display panel according to the gamma adjustment gray scale table.

[0058] Specifically, in some embodiments of this application, step S3 includes: obtaining the initial grayscale compensation table corresponding to the lowest grayscale; and obtaining the initial grayscale compensation table corresponding to the compensated grayscale based on the initial grayscale compensation table corresponding to the first binding point grayscale and the initial grayscale compensation table corresponding to the lowest grayscale.

[0059] If the image display data input to the display panel is binary 8-bit, then 2 will be generated. 8 This generates 256 different gray levels, ranging from the darkest to the brightest. Gray level 0 is the lowest gray level, and gray level 255 is the highest gray level.

[0060] Specifically, interpolation can be performed on the initial grayscale compensation table corresponding to the first binding point grayscale and the initial grayscale compensation table corresponding to the lowest grayscale to obtain the initial grayscale compensation table corresponding to the compensation grayscale of the first binding point grayscale.

[0061] like Figure 3 As shown, in the initial grayscale compensation table corresponding to the lowest grayscale level 0, the grayscale level corresponding to each sub-region is still 0. By interpolating the initial grayscale compensation table corresponding to the lowest grayscale level 0 and the initial grayscale compensation table corresponding to the first binding point grayscale level 100, the initial grayscale compensation table corresponding to the compensated grayscale level 83 of the first binding point grayscale level 100 can be obtained.

[0062] S4. Obtain the target grayscale compensation table for the first binding point grayscale based on the gamma-adjusted grayscale table and the initial grayscale compensation table corresponding to the compensation grayscale.

[0063] Specifically, the second binding point gray level corresponding to each gray level in the initial gray level compensation table corresponding to the compensation gray level can be found in the gamma adjustment gray level table, and each gray level in the initial gray level compensation table corresponding to the compensation gray level can be replaced according to the second binding point gray level to obtain the target gray level compensation table.

[0064] like Figure 3 As shown, gray level 74.7 in the initial gray level compensation table corresponds to gray level 74.7 in the gamma adjustment gray level table. Therefore, gray level 90 in the initial gray level compensation table corresponding to the first binding point gray level 100 can be replaced by gray level 80 at the second binding point corresponding to gray level 74.7. Similarly, gray level 91.3 in the initial gray level compensation table corresponding to gray level 83 corresponds to gray level 91.3 in the gamma adjustment gray level table. Therefore, gray level 110 in the initial gray level compensation table corresponding to the first binding point gray level 100 can be replaced by gray level 105 at the second binding point corresponding to gray level 91.3. This yields the target gray level compensation table for the first binding point gray level 100, which will not be detailed here.

[0065] In some embodiments of the present application, step S4 is followed by: performing luminance compensation on the display panel according to the target gray scale compensation table; and performing gamma adjustment on the display panel according to the gamma-adjusted gray scale table.

[0066] Specifically, after obtaining the target gray scale compensation table of the first binding point gray scale, the display panel is compensated by Demura, and the luminance uniformity of the display panel can be improved. Then, the display panel is adjusted by gamma, so that the luminance displayed by the display panel adapts to the gamma characteristics of the human eye, and the display effect is improved.

[0067] It can be understood that the gray scale debugging method of the display panel provided by the embodiments of the present application does not need to change the order of Demura compensation and gamma adjustment in the gray scale debugging method in the related art. It only needs to adjust the initial gray scale compensation table corresponding to the first binding point gray scale compensated by Demura by using the gamma-adjusted gray scale table, so that the compensation effect of the first binding point gray scale after Demura compensation and gamma adjustment is consistent with the effect of the corresponding compensation gray scale after Demura compensation. Thus, the influence of gamma adjustment on the effect of Demura compensation is improved without affecting the gamma adjustment.

[0068] Correspondingly, please refer to Figure 4 The present application also provides a display device 1000. The display device 1000 comprises a display panel 10 and a driving module 20. The driving module 20 performs gray scale debugging on the display panel 10 by using the gray scale debugging method of the display panel according to any of the above embodiments.

[0069] In some embodiments of the present application, the driving module 20 comprises a timing controller (not shown in the figure). The gamma-adjusted gray scale table and the target gray scale compensation table are stored in the timing controller. Specifically, after performing luminance compensation and gamma adjustment on the display panel 10, the gamma-adjusted gray scale table and the target gray scale compensation table can be burned into the timing controller by a burner. Of course, the driving module 20 can also comprise a system chip, a source driving chip and other devices, which are not described here.

[0070] The display device 1000 provided by the embodiments of the present application performs gray scale debugging on the display panel 10 by using the gray scale debugging method of the display panel according to any of the above embodiments, so that the compensation effect of the first binding point gray scale after Demura compensation and gamma adjustment is consistent with the effect of the corresponding compensation gray scale after Demura compensation. Thus, the influence of gamma adjustment on the effect of Demura compensation is improved without affecting the gamma adjustment. Therefore, the quality of the display device 1000 is improved.

[0071] The gray scale debugging method of the display panel and the display device provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed, and the above description of the embodiments should not be understood as a limitation on the present application.

Claims

1. A grayscale adjustment method for a display panel, characterized in that, include: Obtain the gamma-adjusted grayscale table; The compensation gray level corresponding to the first binding point gray level of brightness compensation is obtained according to the gamma adjustment gray level table. Obtain the initial grayscale compensation table corresponding to the compensated grayscale; The target grayscale compensation table for the first binding point grayscale is obtained based on the gamma-adjusted grayscale table and the initial grayscale compensation table corresponding to the compensation grayscale. The brightness of the display panel is compensated according to the target grayscale compensation table; The display panel is gamma-adjusted according to the gamma adjustment grayscale table.

2. The grayscale adjustment method for a display panel according to claim 1, characterized in that, The process includes the following steps before obtaining the gamma-adjusted grayscale table: Obtain the initial grayscale compensation table corresponding to the grayscale of the first binding point.

3. The grayscale adjustment method for a display panel according to claim 2, characterized in that, The step of obtaining the initial grayscale compensation table corresponding to the compensated grayscale includes: Obtain the initial grayscale compensation table corresponding to the lowest grayscale; The initial grayscale compensation table corresponding to the compensated grayscale is obtained based on the initial grayscale compensation table corresponding to the first binding point grayscale and the initial grayscale compensation table corresponding to the lowest grayscale.

4. The grayscale adjustment method for a display panel according to claim 3, characterized in that, Interpolation processing is performed on the initial grayscale compensation table corresponding to the first binding point grayscale and the initial grayscale compensation table corresponding to the lowest grayscale to obtain the initial grayscale compensation table corresponding to the compensation grayscale.

5. The grayscale adjustment method for a display panel according to claim 2, characterized in that, The step of obtaining the initial grayscale compensation table corresponding to the grayscale of the first binding point includes: Multiple first binding point gray levels are set, and brightness compensation is performed on each first binding point gray level to obtain the initial gray level compensation table corresponding to each first binding point gray level.

6. The grayscale adjustment method for a display panel according to claim 1, characterized in that, The steps for obtaining the gamma-adjusted grayscale table include: The display panel is gamma-adjusted according to the target gamma curve to obtain the gamma-adjusted grayscale table.

7. The grayscale adjustment method for a display panel according to claim 1, characterized in that, The gamma-adjusted grayscale table includes multiple second binding point grayscales and multiple compensation grayscales that correspond one-to-one with the multiple second binding point grayscales; the step of obtaining the target grayscale compensation table of the first binding point grayscales based on the gamma-adjusted grayscale table and the initial grayscale compensation table corresponding to the compensation grayscales includes: The second binding point gray level corresponding to each gray level in the initial gray level compensation table corresponding to the compensation gray level is found in the gamma adjustment gray level table, and each gray level in the initial gray level compensation table corresponding to the compensation gray level is replaced according to the second binding point gray level to obtain the target gray level compensation table.

8. A display device, characterized in that, It includes a display panel and a driving module, wherein the driving module performs grayscale adjustment on the display panel using the grayscale adjustment method of the display panel as described in any one of claims 1-7.

9. The display device according to claim 8, characterized in that, The driving module includes a timing controller, and the gamma adjustment grayscale table and the target grayscale compensation table are stored in the timing controller.

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