Gray scale adjusting method of display panel and display device

Abstract

The application provides a gray scale debugging method of a display panel and a display device. The gray scale debugging method of the display panel comprises: setting an abnormal display area comprising a first display area and a second display area which are adjacent, the gray scale of the first sub-pixel located in the first display area being less than or equal to 10 gray scales, and the gray scale of the first sub-pixel located in the second display area being greater than the gray scale of the first sub-pixel located in the first display area; obtaining a to-be-displayed picture of the display panel, and judging whether the abnormal display area exists in the to-be-displayed picture; and if the abnormal display area exists in the to-be-displayed picture, increasing the gray scale of the first sub-pixel located in the first display area by changing a white balance component, so as to improve the display effect of the abnormal display area. The application can improve the watermark problem of the display picture and effectively avoid the reduction of the contrast of the display picture.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a grayscale adjustment method and display device for a display panel. Background Technology

[0002] With the continuous development of display technology, people's pursuit of display quality is getting higher and higher. Currently, watermarking issues still exist in different display images on display panels. Watermarking is usually improved through Gamma voltage adjustment, but Gamma voltage adjustment does not differentiate between the colors of individual pixels. For example, during Gamma voltage adjustment, all RGB sub-pixels are adjusted, resulting in slightly lower precision. Furthermore, the more Gamma voltage adjustments are made to the RGB sub-pixels, the more obvious the watermark improvement, but the more severe the reduction in the contrast of the displayed image. Summary of the Invention

[0003] This application provides a grayscale adjustment method and display device for a display panel, so as to improve the watermark problem of the display screen while avoiding a reduction in the contrast of the display screen.

[0004] This application provides a grayscale adjustment method for a display panel, wherein the display panel includes at least one data line and a first sub-pixel and a second sub-pixel connected to the data line, the first sub-pixel and the second sub-pixel have different colors, and the data line is used to transmit data voltage to the first sub-pixel and the second sub-pixel in sequence;

[0005] The grayscale adjustment method for the display panel includes:

[0006] The display panel includes at least one data line and a first sub-pixel and a second sub-pixel connected to the data line. The first sub-pixel and the second sub-pixel have different colors. The data line is used to transmit data voltages to the first sub-pixel and the second sub-pixel sequentially. The grayscale adjustment method of the display panel includes:

[0007] The display panel obtains the image to be displayed and determines whether there is an abnormal display area in the image to be displayed. The abnormal display area includes an adjacent first display area and a second display area. The gray level of the first sub-pixel located in the first display area is less than or equal to a preset gray level, and the gray level of the first sub-pixel located in the second display area is greater than the gray level of the first sub-pixel located in the first display area.

[0008] If the abnormal display area exists in the image to be displayed, the gray level of the first sub-pixel located in the first display area is increased by changing the white balance component, so as to improve the display effect of the abnormal display area.

[0009] Optionally, in some embodiments of this application, the step of increasing the grayscale of the first sub-pixel located in the first display area by changing the white balance component includes:

[0010] Obtain the initial white balance data table of the display panel;

[0011] Based on the color and grayscale of the first sub-pixel located in the first display area, increase the white balance component of the color corresponding to the grayscale in the initial white balance data table.

[0012] Optionally, in some embodiments of this application, the preset grayscale is 0 grayscale, and the step of increasing the white balance component of the color corresponding to the grayscale in the initial white balance data table includes:

[0013] Increase the white balance component of the color corresponding to gray level 0 in the initial white balance data table, so that the increase corresponding to gray level 0 is 1 to 20 gray levels.

[0014] Optionally, in some embodiments of this application, the preset gray level is any gray level from 0 to 10.

[0015] Optionally, in some embodiments of this application, the preset grayscale is 0 grayscale, and the image to be displayed is a yellow image, a green image, an orange image, or a blue image.

[0016] Optionally, in some embodiments of this application, in the abnormal display area, the gray levels of the second sub-pixels located in the first display area and the second display area are all within a preset gray level range, and the preset gray level is less than the minimum gray level of the preset gray level range.

[0017] Optionally, in some embodiments of this application, the preset gray level is 0 gray level, and in the second display area, the gray level of the plurality of first sub-pixels is greater than or equal to 1, and the gray level of the plurality of first sub-pixels gradually increases.

[0018] Optionally, in some embodiments of this application, the first sub-pixel includes an intersecting first side and a second side, the length of the first side is greater than the length of the second side, and the extension direction of the data line is parallel to the second side.

[0019] Optionally, in some embodiments of this application, the display panel further includes a third sub-pixel connected to the data line, wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel are of different colors, and the data line is used to transmit data voltage to the first sub-pixel, the second sub-pixel, and the third sub-pixel in sequence;

[0020] The first sub-pixel is a blue sub-pixel, the second sub-pixel is a green sub-pixel, and the third sub-pixel is a red sub-pixel. In the same column of sub-pixels, the blue sub-pixel, the green sub-pixel, and the red sub-pixel are arranged in a repeating sequence, and the sub-pixels located in the same row have the same color.

[0021] Accordingly, this application also provides a display device, including a display panel and a driving device, wherein the driving device is used to perform the grayscale adjustment method of the display panel as described in any of the preceding claims.

[0022] In the grayscale adjustment method for the display panel provided in this application, after acquiring the image to be displayed, it can be determined whether an abnormal display area exists in the image based on the grayscale distribution characteristics of the abnormal display area. Then, if the abnormal display area exists in the image to be displayed, the grayscale of the first sub-pixel located in the first display area is increased by changing the white balance component to improve the display effect of the abnormal display area. Since the white balance components of different colors corresponding to the same grayscale can be adjusted independently, this application can adjust the grayscale of the first sub-pixel located in the first display area independently by changing the white balance component to increase the grayscale. The adjustment method is more precise and does not affect the second sub-pixel. While improving the watermark problem of the displayed image, it effectively avoids a reduction in contrast. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a display panel provided in this application;

[0024] Figure 2 This is a schematic diagram illustrating the relationship between grayscale and voltage provided in this application;

[0025] Figure 3 This is a flowchart illustrating a grayscale adjustment method for a display panel provided in this application;

[0026] Figure 4 This is a schematic diagram showing the relationship between different gray levels and the pressure difference changes of RGB sub-pixels provided in this application;

[0027] Figure 5 This is a schematic diagram of an initial white balance data table provided in this application;

[0028] Figure 6 This application provides Figure 3 A flowchart illustrating step 102 in the middle section;

[0029] Figure 7 This is a schematic diagram illustrating the watermark improvement effect corresponding to different grayscale adjustment methods provided in this application;

[0030] Figure 8 This is a schematic diagram of a display device provided in this application. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. The described embodiments are only used to explain the ideas of the present invention and should not be regarded as a limitation on the scope of protection of this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features.

[0032] This application provides a grayscale adjustment method and display device for a display panel, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application.

[0033] Please see Figure 1 , Figure 1 This is a schematic diagram of a display panel structure provided in this application. In this embodiment, the display panel 100 includes at least one data line 10 and a first sub-pixel 11 and a second sub-pixel 12 connected to the data line 10. The first sub-pixel 11 and the second sub-pixel 12 have different colors. When the display panel 100 is in use, the data line 10 is used to transmit data voltage to the first sub-pixel 11 and the second sub-pixel 12 in sequence.

[0034] Specifically, the display panel 100 also includes multiple scan lines 20. The data lines 10 and scan lines 20 are arranged intersectingly. The scan lines 20 can be opened row by row, and the data lines 10 transmit data voltages to the first sub-pixel 11 and the second sub-pixel 12 in sequence.

[0035] In this embodiment, the display panel 100 may further include a third sub-pixel 13 connected to the data line 10. When the display panel 100 is in use, the data line 10 is used to transmit data voltages sequentially to the first sub-pixel 11, the second sub-pixel 12, and the third sub-pixel 13.

[0036] In this embodiment, the first sub-pixel 11, the second sub-pixel 12, and the third sub-pixel 13 can all be selected from red sub-pixels, green sub-pixels, blue sub-pixels, white sub-pixels, yellow sub-pixels, etc. The colors of the first sub-pixel 11, the second sub-pixel 12, and the third sub-pixel 13 can be determined by the pixel architecture of the display panel 100.

[0037] like Figure 1As shown, the display panel 100 provided in this embodiment can adopt a Tri-gate architecture. The Tri-gate architecture is a commonly used cost-reduction method, where all sub-pixels are rotated 90 degrees. Specifically, in the Tri-gate architecture, each sub-pixel (first sub-pixel 11, second sub-pixel 12, and third sub-pixel 13) includes intersecting first side 111 and second side 112. The length of the first side 111 is greater than the length of the second side 112, and the extension direction of the data line 10 is parallel to the second side 112. Thus, when the sub-pixels are arranged in an RGB structure, the number of scan lines 20 increases threefold, and the number of data lines 10 decreases to one-third of the original. Furthermore, during line-by-line scanning of each frame of the display image, the first row of scan lines 20 corresponds to the first sub-pixel 11, the second row of scan lines 20 corresponds to the second sub-pixel 12, and the third row of scan lines 20 corresponds to the third sub-pixel 13.

[0038] Specifically, in some embodiments of this application, the first sub-pixel 11 is a blue sub-pixel, the second sub-pixel 12 is a green sub-pixel, and the third sub-pixel 13 is a red sub-pixel. Within the same column of sub-pixels, the blue, green, and red sub-pixels are arranged in a repeating sequence, and sub-pixels in the same row have the same color. That is, the display panel 100 adopts a Tri-gate BGR pixel arrangement architecture.

[0039] Of course, the pixel arrangement architecture of the display panel 100 provided in this application embodiment is not limited to the Tri-gate architecture, as long as the same data line 10 is connected to the first sub-pixel 11 and the second sub-pixel 12 of different colors, and data voltage is transmitted to the first sub-pixel 11 and the second sub-pixel 12 in sequence.

[0040] Regarding the pixel arrangement architecture described above, the inventors discovered through research that since the first sub-pixel 11 and the second sub-pixel 12 are controlled by the same data line 10, and the data line 10 transmits data voltage to the first sub-pixel 11 and the second sub-pixel 12 in sequence, the data voltage of the second sub-pixel 12 will be affected by the data voltage of the first sub-pixel 11.

[0041] For details, please refer to Figure 2 , Figure 2 This is a schematic diagram illustrating the relationship between voltage and grayscale provided in this application. For example... Figure 2As shown, each grayscale level corresponds to a voltage, which is the data voltage transmitted from data line 10 to the corresponding sub-pixel. It can be seen that the relationship between grayscale and voltage is not linear; at low grayscale levels, the voltage change slope is very high, such as the 0-10 grayscale levels in the figure. If the grayscale of the first sub-pixel 11 is low, it will significantly affect the voltage of the second sub-pixel 12, thus affecting the brightness of the second sub-pixel 12. Therefore, if there are many low-grayscale first sub-pixels 11 in the same area of ​​the displayed image, watermarking problems are likely to occur.

[0042] To address this issue, this application provides a grayscale adjustment method for a display panel. In this method, an abnormal display area is first defined as including an adjacent first display area and a second display area. The grayscale of the first sub-pixel located in the first display area is less than or equal to a preset grayscale, and the grayscale of the first sub-pixel located in the second display area is greater than the grayscale of the first sub-pixel located in the first display area. Then, a display image to be shown on the display panel is acquired, and it is determined whether the abnormal display area exists in the display image. Finally, if the abnormal display area exists in the display image, the grayscale of the first sub-pixel located in the first display area is increased by changing the white balance component to improve the display effect of the abnormal display area.

[0043] This application embodiment pre-defines an abnormal display area. After acquiring the image to be displayed, it can determine whether an abnormal display area exists in the image based on the grayscale distribution characteristics of the pre-define abnormal display area. Then, if an abnormal display area is detected, the grayscale of the first sub-pixel located in the first display area is increased by changing the white balance component. It is understood that since the white balance components of different colors corresponding to the same grayscale can be adjusted independently, this application embodiment, by increasing the grayscale of the first sub-pixel located in the first display area by changing the white balance component, can individually adjust the grayscale of the first sub-pixel. The adjustment method is more precise and will not affect other sub-pixels. While improving the watermark problem of the displayed image, it can effectively avoid a reduction in contrast.

[0044] Please see Figure 1 and Figure 3 , Figure 3 This is a flowchart illustrating the grayscale adjustment method for a display panel provided in this application. In the embodiments of this application, the grayscale adjustment method for the display panel specifically includes the following steps:

[0045] 101. Obtain the image to be displayed on the display panel and determine whether there is an abnormal display area in the image to be displayed. The abnormal display area includes an adjacent first display area and a second display area. The gray level of the first sub-pixel located in the first display area is less than or equal to a preset gray level, and the gray level of the first sub-pixel located in the second display area is greater than the gray level of the first sub-pixel located in the first display area.

[0046] The first and second display areas can be vertically distributed along the extension direction of the data line 10. Alternatively, they can be horizontally arranged along the extension direction of the scan line 20. The first and second display areas only need to be adjacent to each other; this application does not impose specific limitations on this. For example, if the first and second display areas are vertically distributed, with the first display area being dark and the second display area being bright, creating a difference in brightness, and both the first and second display areas are large areas, then subjectively, a watermark is formed.

[0047] The size of the preset grayscale can be set according to the relationship between the grayscale corresponding to the display panel 100 and the voltage.

[0048] Understandably, the grayscale division of the display panel 100 is determined based on its image data. For example, if the image data of the display panel 100 is 8-bit binary, then the grayscale division of the display panel 100 is 0-255 grayscale levels. If the image data of the display panel 100 is 10-bit binary, then the grayscale division of the display panel 100 is 0-1023 grayscale levels, and so on. Therefore, if the display panel 100 uses different image data, the grayscale division of the display panel 100 will be different, the relationship between grayscale and voltage may be different, and the preset grayscale value range will also be different.

[0049] All embodiments in this application are described using the example of the display panel 100 displaying 8-bit binary image data. In this case, as... Figure 2 As shown, the preset gray level can be any gray level from 0 to 10. That is, the voltage change slope corresponding to the preset gray level is very high.

[0050] Specifically, the preset gray levels can be 0 gray level, 1 gray level, 2 gray levels, 5 gray levels, 10 gray levels, etc. Figure 2 It can be seen that the smaller the grayscale, the higher the slope of the voltage change, the more obvious the pull-down effect of the first sub-pixel 11 on the second sub-pixel 12, and the more obvious the watermark in the abnormal display area.

[0051] The grayscale of the second sub-pixel 12 located in the first display area and the second display area can be set according to the actual display screen of the display panel 100.

[0052] For example, in some embodiments of this application, the grayscale of the second sub-pixel 12 located in the first display area and the second display area is within a preset grayscale range. The preset grayscale is less than the smallest grayscale in the preset grayscale range. The preset grayscale range can be 20-200 grayscale levels. Alternatively, the preset grayscale range can include medium-high grayscale levels, such as 90-160 grayscale levels.

[0053] Since the grayscale of the first sub-pixel 11 is lower than that of the second sub-pixel 12, the data voltage corresponding to the first sub-pixel 11 is lower than that corresponding to the second sub-pixel 12. Therefore, the first sub-pixel 11 significantly reduces the brightness of the second sub-pixel 12, making the displayed image prone to watermarking.

[0054] For example, in some embodiments of this application, the preset grayscale is 0 grayscale, that is, in the first display area, the grayscale of the plurality of first sub-pixels 11 is all 0. In the second display area, the grayscale of the plurality of first sub-pixels 11 is greater than or equal to 1, and the grayscale of the plurality of first sub-pixels 11 gradually increases.

[0055] Depend on Figure 2 It can be seen that the voltage change slope is the largest at grayscale 0, therefore the first sub-pixel 11 at grayscale 0 has the greatest impact on the second sub-pixel 12. Furthermore, since the grayscale of the multiple first sub-pixels 11 located in the second display area gradually increases, the pull-down effect of the first sub-pixel 11 at grayscale 0 on the multiple second sub-pixels 12 is different, making the displayed image more prone to watermarking.

[0056] Thus, the designated abnormal display area is an area more prone to watermarking. By detecting the display screen based on the grayscale distribution characteristics of this abnormal display area, the accuracy of watermark improvement can be improved.

[0057] In addition, the grayscale distribution characteristics of the abnormal display area can be stored in a register or in the timing controller (TCON) chip of the display device.

[0058] Typically, the system-on-chip (SOC) of a display device outputs video signals to a timing control chip. The timing control chip analyzes the video signals to obtain image data for the screen to be displayed. This image data includes the grayscale distribution corresponding to each sub-pixel in the screen to be displayed.

[0059] After acquiring the image to be displayed, the grayscale distribution of the image can be analyzed to detect whether there is an area in the image that has the same grayscale distribution characteristics as the abnormal display area. If so, the area is determined to be an abnormal display area.

[0060] In this embodiment, the image to be displayed can be a common mixed-color image used by the display panel 100 in practical applications. For example, when the preset grayscale is 0 grayscale, the image to be displayed can be a yellow image, a green image, an orange image, a blue image, etc.

[0061] If the image to be displayed is yellow, green, or orange, then the first sub-pixel 11 is a blue sub-pixel, and there is an area in the image to be displayed where blue sub-pixels with a grayscale of 0 are concentrated. If the image to be displayed is blue, then the first sub-pixel 11 is a red sub-pixel, and there is an area in the image to be displayed where red sub-pixels with a grayscale of 0 are concentrated.

[0062] Taking a yellow image as an example, since the brightness proportion of blue sub-pixels in a mixed color image is very low, even if the blue sub-pixel in the first display area is 0 grayscale and the blue sub-pixel in the second display area is 1 grayscale, 2 grayscale, etc., under normal circumstances, it will not cause a watermark, and the subjectively perceived display image will still be a normal image. However, in the embodiments of this application, since the data voltage of the first sub-pixel 11 (blue sub-pixel) will affect the data voltage of the second sub-pixel 12 (red or green sub-pixel), the voltage differences of different levels of the first sub-pixel 11 in the first and second display areas are large, and the impact on the second sub-pixel 12 is also large, thus forming a watermark.

[0063] For details, please refer to Table 1 and Figure 4 In this embodiment of the application, the display panel 100 is used as a reference. Figure 1 The following explanation uses the display panel 100 as an example. The first sub-pixel 11 is a blue sub-pixel (B), the second sub-pixel 12 is a green sub-pixel (G), and the third sub-pixel 13 is a red sub-pixel (R). The grayscale of the first sub-pixel 11 is 0 grayscale. The grayscale of the second sub-pixel 12 is 90 grayscale. The grayscale of the third sub-pixel 13 is 160 grayscale.

[0064] Table 1

[0065] 0 0.79 2.14 2.62 1 1.1 1.83 2.31 2 1.36 1.57 2.05 3 1.54 1.39 1.87 4 1.7 1.23 1.72 5 1.83 1.1 1.58 6 1.94 0.99 1.47 7 2.03 0.9 1.38 8 2.1 0.83 1.31 9 2.16 0.77 1.25 10 2.2 0.73 1.21 11 2.24 0.69 1.17 12 2.27 0.66 1.14 13 2.3 0.63 1.12 14 2.32 0.61 1.09 15 2.34 0.59 1.08 16 2.36 0.58 1.06 17 2.37 0.56 1.04 18 2.38 0.55 1.03 19 2.4 0.53 1.02 20 2.41 0.52 1 21 2.42 0.51 0.99 22 2.43 0.5 0.98 23 2.44 0.49 0.97 24 2.45 0.48 0.96 25 2.46 0.47 0.95 26 2.47 0.46 0.95 27 2.48 0.45 0.94 28 2.48 0.45 0.93 29 2.49 0.44 0.92 30 2.5 0.43 0.91 31 2.51 0.42 0.91 32 2.51 0.42 0.9 … … 90 2.93 … … 160 3.41 … …

[0066] From Table 1 and Figure 4 It can be seen that at low grayscale levels, the voltage of the blue sub-pixel changes significantly with the grayscale level. That is, the smaller the grayscale level, the higher the slope of the voltage change. Correspondingly, the smaller the grayscale level, the greater the voltage difference between the green and blue sub-pixels, and also the greater the voltage difference between the red and blue sub-pixels. Therefore, the large voltage differences between different levels of the first sub-pixel 11 in the first and second display areas have a significant impact on the second sub-pixel 12, thus forming a watermark.

[0067] 102. If the abnormal display area exists in the screen to be displayed, the gray level of the first sub-pixel located in the first display area is increased by changing the white balance component.

[0068] White balance, in particular, balances the red, green, and blue components to ensure that the display panel 100 can display true colors. For example... Figure 5 As shown, in the initial white balance data table, each gray level corresponds to a red pixel white balance component R0, a green pixel white balance component G0, and a blue pixel white balance component B0.

[0069] The initial white balance data table represents the conversion of 8-bit image data voltages to 10-bit image data voltages. For example, gray level 2 in the 8-bit image data voltage corresponds to gray level 8 in the 10-bit image data voltage, gray level 3 in the 8-bit image data voltage corresponds to gray level 12 in the 10-bit image data voltage, gray level 255 in the 8-bit image data voltage corresponds to gray level 1020 in the 10-bit image data voltage, and so on. The initial white balance data table is a linear data table, meaning that the values ​​of the red pixel white balance component R0, green pixel white balance component G0, and blue pixel white balance component B0 corresponding to all gray levels are the same gray level value. It should be noted that white balance adjustment is a technique well-known to those skilled in the art and will not be elaborated upon here.

[0070] Therefore, by increasing the white balance component, the grayscale of the first sub-pixel 11 located in the first display area can be increased.

[0071] For details, please refer to Figure 6 , Figure 6 This application provides Figure 3 The first flowchart of step 13 is shown. Step 12 includes the following steps:

[0072] 1021. Obtain the initial white balance data table of the display panel.

[0073] The initial white balance data table can be stored in a register or a timing control chip.

[0074] 1022. Based on the color and grayscale of the first sub-pixel located in the first display area, increase the white balance component of the color corresponding to the grayscale in the initial white balance data table.

[0075] Among them, by Figure 5 As can be seen, in the initial white balance data table, each gray level corresponds to a red pixel white balance component R0, a green pixel white balance component G0, and a blue pixel white balance component B0. This application adjusts only the white balance components of the corresponding colors based on the color of the first sub-pixel 11. For example, when the first sub-pixel 11 is a blue sub-pixel, the blue pixel white balance component B0 corresponding to gray level 0 is increased, while the red pixel white balance component R0 and the green pixel white balance component G0 corresponding to gray level 0 remain at 0.

[0076] In some embodiments of this application, step 1022 may specifically be: increasing the white balance component of the color corresponding to gray level 0 in the initial white balance data table, so that the increase corresponding to gray level 0 is 1 to 20 gray levels.

[0077] For example, if the image data of the display panel 100 is 8 bits, the initial white balance data table indicates that the 8-bit image data voltage is converted to a 10-bit image data voltage. Therefore, to increase the grayscale of the first sub-pixel 11 from grayscale 0 to grayscale 1, the white balance component corresponding to grayscale 0 needs to be increased from grayscale 0 to grayscale 4. To increase the grayscale of the first sub-pixel 11 from grayscale 0 to grayscale 2, the white balance component corresponding to grayscale 0 needs to be increased from grayscale 0 to grayscale 8.

[0078] For example, if the image data of the display panel 100 is 8 bits, the initial white balance data table indicates that the 8-bit image data voltage is converted into a 12-bit image data voltage. Therefore, to increase the grayscale of the first sub-pixel 11 from grayscale 0 to grayscale 1, the white balance component corresponding to grayscale 0 needs to be increased from grayscale 0 to grayscale 16. To increase the grayscale of the first sub-pixel 11 from grayscale 0 to grayscale 2, the white balance component corresponding to grayscale 0 needs to be increased from grayscale 0 to grayscale 32.

[0079] In some embodiments of this application, the increase corresponding to gray level 0 is 1 to 10 gray levels or 1 to 5 gray levels. It is understood that when the white balance component changes significantly, it will affect the white balance effect. Therefore, embodiments of this application limit the increase corresponding to gray level 0 to 10 gray levels or 1 to 5 gray levels, which can improve the watermark while ensuring the white balance effect.

[0080] In addition, logic can be added to the timing control chip to achieve the function of adjusting the white balance component of the corresponding color for each gray level.

[0081] For further details, please refer to Figure 7 , Figure 7 This diagram illustrates the watermark improvement effects of different grayscale adjustment methods provided in this application. The embodiments of this application tested both the Gamma voltage adjustment method and the grayscale adjustment method of this application.

[0082] Before the watermark on the displayed image was improved, the brightness at 0 grayscale was 0.056. The brightness at 255 grayscale was 335.90. The contrast ratio was 5998. Based on this, the contrast ratio was defined as 100%.

[0083] After applying the Gamma voltage adjustment method, the watermark on the displayed image improved. The brightness at 0 grayscale was 0.062, and the brightness at 255 grayscale was 335.90. The contrast ratio was 5418, reduced to 90%. It is evident that the contrast ratio decreased by 10% after the watermark improvement.

[0084] After adopting the grayscale adjustment method of this application, the improvement in watermark quality is consistent with that achieved using the Gamma voltage adjustment method. The brightness of grayscale 0 is 0.057, and the brightness of grayscale 255 is 335.90. The contrast ratio is 5893, reduced to 98%. It is evident that the contrast ratio only decreased by 2% after watermark improvement. The grayscale adjustment method of this application can improve the watermark problem in the display screen and effectively prevent a decrease in the contrast ratio of the display screen.

[0085] Accordingly, please refer to Figure 8 This application also provides a display device 1000. The display device 1000 includes a display panel 100 and a driving device 200. The driving device 200 is used to perform the grayscale adjustment method of the display panel as described in any of the above embodiments.

[0086] The driving device 200 may include a driving chip and a timing control chip. The driving chip can output the data voltage corresponding to each sub-pixel to the data line. The timing control chip is used to acquire the image to be displayed and execute the grayscale adjustment method of the display panel described in any of the above embodiments.

[0087] The display device 1000 provided in this application embodiment includes a display panel 100 and a driving device 200. When the display device 1000 adjusts the grayscale of the display panel 100 using the grayscale adjustment method of the display panel, it can determine whether the abnormal display area exists in the image to be displayed based on the set abnormal display area, and increase the grayscale of the first sub-pixel located in the first display area by changing the white balance component, thereby adjusting the grayscale of the first sub-pixel individually. The adjustment method is more precise and will not affect other sub-pixels. While improving the watermark problem of the displayed image, it can effectively avoid the reduction of contrast.

[0088] Of course, this application may have other various embodiments. Without departing from the spirit and essential points of this application, those skilled in the art can make various corresponding changes and modifications based on this application, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A grayscale adjustment method for a display panel, characterized in that, The display panel includes at least one data line and a first sub-pixel, a second sub-pixel, and a third sub-pixel connected to the data line. The first sub-pixel, the second sub-pixel, and the third sub-pixel are of different colors. The data line is used to transmit data voltage to the first sub-pixel, the second sub-pixel, and the third sub-pixel in sequence. The first sub-pixel is a blue sub-pixel, the second sub-pixel is a green sub-pixel, and the third sub-pixel is a red sub-pixel. In the same column of sub-pixels, the blue sub-pixel, the green sub-pixel, and the red sub-pixel are arranged in a repeating sequence, and the sub-pixels located in the same row have the same color. The grayscale adjustment method for the display panel includes: The abnormal display area is set to include an adjacent first display area and a second display area. The gray level of the first sub-pixel located in the first display area is less than or equal to a preset gray level, and the gray level of the first sub-pixel located in the second display area is greater than the gray level of the first sub-pixel located in the first display area. Obtain the image to be displayed on the display panel and determine whether the abnormal display area exists in the image to be displayed; the image to be displayed is a yellow, green, orange, or blue image. If the abnormal display area exists in the image to be displayed, the gray level of the first sub-pixel located in the first display area is increased by changing the white balance component, so as to improve the display effect of the abnormal display area.

2. The grayscale adjustment method according to claim 1, characterized in that, The step of increasing the grayscale of the first sub-pixel located in the first display area by changing the white balance component includes: Obtain the initial white balance data table of the display panel; Based on the color and grayscale of the first sub-pixel located in the first display area, increase the white balance component of the color corresponding to the grayscale in the initial white balance data table.

3. The grayscale adjustment method for a display panel according to claim 2, characterized in that, The preset grayscale is 0 grayscale, and the step of increasing the white balance component of the color corresponding to the grayscale in the initial white balance data table includes: Increase the white balance component of the color corresponding to gray level 0 in the initial white balance data table, so that the increase corresponding to gray level 0 is 1 to 20 gray levels.

4. The grayscale adjustment method for a display panel according to claim 1, characterized in that, The preset gray level is any gray level from 0 to 10.

5. The grayscale adjustment method for a display panel according to claim 4, characterized in that, The preset gray level is 0 gray level.

6. The grayscale adjustment method for a display panel according to claim 1, characterized in that, The gray levels of the second sub-pixels located in the first display area and the second display area are both within a preset gray level range, and the preset gray level is smaller than the minimum gray level of the preset gray level range.

7. The grayscale adjustment method for a display panel according to claim 6, characterized in that, The preset gray level is 0 gray level. In the second display area, the gray levels of multiple first sub-pixels are all greater than or equal to 1, and the gray levels of multiple first sub-pixels gradually increase.

8. The grayscale adjustment method for a display panel according to claim 1, characterized in that, The first sub-pixel includes an intersecting first side and a second side, the length of the first side is greater than the length of the second side, and the extension direction of the data line is parallel to the second side.

9. A display device, characterized in that, It includes a display panel and a driving device, the driving device being used to perform the grayscale adjustment method of the display panel as described in any one of claims 1-8.

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