A driving method of a display device

Abstract

The embodiment of the present application discloses a display device driving method, comprising: obtaining an intermediate lookup table according to an initial overdrive lookup table, the ratio of the overdrive values of the first m columns in the intermediate lookup table to the overdrive values of the first m columns in the initial overdrive lookup table is a first preset ratio, the ratio of the overdrive values of the last n columns in the intermediate lookup table to the overdrive values of the last n columns in the initial overdrive lookup table is a second preset ratio, the first preset ratio and the second preset ratio are both less than 1, m is a positive integer less than y; providing a j-bit to-be-displayed image signal, j is a positive integer greater than i; converting the to-be-displayed image signal into an i-bit target image signal; and searching for the overdrive value of the target image signal according to the intermediate lookup table. In the present application, the water mark defect problem can be reduced or weakened, or even avoided.

Description

Technical Field

[0001] This application relates to the field of displays, and more specifically to a driving method for a display device. Background Technology

[0002] Display panels are widely used in daily life, such as in the screens of mobile phones and computers. With the rapid development of the display panel industry, in addition to requirements for high resolution, wide viewing angles, and low power consumption, people are also placing other high-performance demands on display panels. The larger the panel size and the higher the refresh rate, the greater the difference in charging between different areas. The charging effect of each data integrated circuit is inconsistent, making it difficult to ensure that the charging on both sides and in the middle of each data integrated circuit is consistent and to guarantee uniformity across the entire surface. Currently, the industry also uses the Line Over Driver (LOD) algorithm to improve the image quality uniformity problem caused by insufficient panel charging. Specifically, when the charging voltage of adjacent pixels is inconsistent, an overdrive voltage is used to reduce the impact of the cell data line RC (resistivity and capacitance) of the panel.

[0003] However, the inventors discovered that after converting the 12-bit image signal into an 8-bit image signal and calling the overdrive lookup table corresponding to the 8-bit signal, the displayed image exhibited watermark defects (watermark mura). Summary of the Invention

[0004] This application provides a driving method for a display device that can solve the problem discovered by the inventors that after converting a 12-bit image signal into an 8-bit image signal and calling the corresponding 8-bit overdrive lookup table, the displayed image exhibits watermark defects (mura).

[0005] This application provides a driving method for a display device, including:

[0006] Obtain an initial overdrive lookup table, which includes grayscale data arranged in y rows and y columns of an array. The grayscale data includes grayscale binding points and their corresponding overdrive values. The initial overdrive lookup table supports displaying i-bit image signals, where y is a positive integer greater than 2 and i is a positive integer greater than 2.

[0007] An intermediate lookup table is obtained based on the initial overdrive lookup table. Both the initial overdrive lookup table and the intermediate lookup table are defined to include a dummy diagonal. One end of the dummy diagonal is the first row and the first column. One side of the dummy diagonal is the grayscale rising area, and the other side of the dummy focus line is the grayscale falling area. The ratio of the overdrive values ​​of the first m columns of the grayscale rising area in the intermediate lookup table to the overdrive values ​​of the first m columns of the grayscale rising area in the initial overdrive lookup table is a first preset ratio. The ratio of the overdrive values ​​of the last n columns of the grayscale falling area in the intermediate lookup table to the overdrive values ​​of the last n columns of the grayscale falling area in the initial overdrive lookup table is a second preset ratio. Both the first preset ratio and the second preset ratio are less than 1, and m is a positive integer less than y.

[0008] Provide a j-bit image signal to be displayed, where j is a positive integer greater than i;

[0009] Convert the image signal to be displayed into the i-bit target image signal;

[0010] The overdrive value of the target image signal is found according to the intermediate lookup table.

[0011] Optionally, in some embodiments of this application, m is a positive integer less than or equal to 5, and n is a positive integer less than or equal to 5.

[0012] Optionally, in some embodiments of this application, the value range of the first preset ratio is 0.4 to 0.6; and the value range of the second preset ratio is 0.7 to 0.9.

[0013] Optionally, in some embodiments of this application, the first preset ratio is equal to 0.5 and the second preset ratio is equal to 0.8.

[0014] Optionally, in some embodiments of this application, j equals 12 and i equals 8.

[0015] Optionally, in some embodiments of this application, the method of "converting the image signal to be displayed into the i-bit target image signal" is linear interpolation.

[0016] Optionally, in some embodiments of this application, the method for obtaining the intermediate lookup table based on the initial overdrive lookup table further includes:

[0017] The last s columns of the gray-scale decreasing region in the intermediate lookup table are linearly interpolated based on the overdrive values ​​of the first row and the first preset row of the corresponding column of the gray-scale decreasing region in the intermediate lookup table to obtain the first linear interpolation result, where s is a positive integer and less than or equal to n.

[0018] Update the overdrive value of the row between the first row and the first preset row in the intermediate lookup table based on the first linear interpolation result.

[0019] Optionally, in some embodiments of this application, the method for obtaining the intermediate lookup table based on the initial overdrive lookup table further includes:

[0020] The first r columns of the gray-scale rising area in the intermediate lookup table are linearly interpolated based on the overdrive values ​​of the second first row and the second preset row of the corresponding column of the gray-scale rising area in the intermediate lookup table to obtain the second linear interpolation result, where r is a positive integer and less than or equal to m.

[0021] Update the overdrive value of the row between the second first row and the second preset row in the intermediate lookup table based on the second linear interpolation result.

[0022] Optionally, in some embodiments of this application, the grayscale value of the first preset row is less than or equal to 96, and the grayscale value of the second preset row is less than or equal to 96.

[0023] Optionally, in some embodiments of this application, s equals 2 and / or r equals 2.

[0024] This application provides a driving method for a display device, comprising: obtaining an initial overdrive lookup table, the initial overdrive lookup table including grayscale data arranged in y rows and y columns, the grayscale data including grayscale binding points and their corresponding overdrive values, and the initial overdrive lookup table supporting the display of i-bit image signals, where y is a positive integer greater than 2 and i is a positive integer greater than 2; obtaining an intermediate lookup table based on the initial overdrive lookup table, defining that both the initial overdrive lookup table and the intermediate lookup table include a dummy diagonal, one end of the dummy diagonal being the first row and the first column, one side of the dummy diagonal being the grayscale rising area, and the other side of the dummy focus line being the grayscale falling area. The ratio of the overdrive values ​​of the first m columns of the grayscale rising region in the intermediate lookup table to the overdrive values ​​of the first m columns of the grayscale rising region in the initial overdrive lookup table is a first preset ratio, and the ratio of the overdrive values ​​of the last n columns of the grayscale falling region in the intermediate lookup table to the overdrive values ​​of the last n columns of the grayscale falling region in the initial overdrive lookup table is a second preset ratio. Both the first and second preset ratios are less than 1, and m is a positive integer less than y. A j-bit image signal to be displayed is provided, where j is a positive integer greater than i. The image signal to be displayed is converted into an i-bit target image signal. The overdrive value of the target image signal is found according to the intermediate lookup table. In this application, an intermediate lookup table is obtained according to the initial overdrive lookup table, and the first overdrive value of the target image signal is found according to the intermediate lookup table. The intermediate lookup table is processed according to the first and second preset ratios, both of which are less than 1. This reduces the difference in overdrive values ​​of two i-bit image signals with a grayscale accuracy difference of 1 after calling the intermediate lookup table when the j-bit image signal is converted into an i-bit image signal, thereby reducing or weakening, or even avoiding, the problem of watermark defects. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram showing the effect comparison before and after the improvement of the driving method of a display device provided in Embodiment 1 of this application;

[0027] Figure 2 A schematic flowchart illustrating the driving steps of a display device according to Embodiment 1 of this application;

[0028] Figure 3 This is a schematic diagram illustrating an example of an initial overdrive lookup table for a display device driving method provided in Embodiment 1 of this application;

[0029] Figure 4 This is a first example schematic diagram of an intermediate lookup table for a display device driving method provided in Embodiment 1 of this application;

[0030] Figure 5 This is a schematic flowchart of a driving method for a display device provided in Embodiment 2 of this application;

[0031] Figure 6 This is a schematic diagram illustrating an example of an intermediate lookup table provided in Embodiment 2 of this application;

[0032] Figure 7 This is a schematic diagram of the first driving step proposed in Embodiment 3 of this application;

[0033] Figure 8 This is a schematic diagram of the second driving step proposed in Embodiment 3 of this application;

[0034] Figure 9 This is a schematic diagram showing the effect comparison before and after the improvement of the driving method of a display device provided in Embodiment 3 of this application. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0036] The inventors discovered that after converting a 12-bit image signal into an 8-bit image signal and calling the corresponding 8-bit overdrive lookup table, the displayed image exhibited a watermark effect (watermark mura).

[0037] After analysis, the inventor discovered that the watermark defect was caused by the fact that when the 12-bit image signal was converted into an 8-bit image signal, the values ​​on both sides of 0.5 would produce a difference of 1 gray level precision after rounding. The difference between the two 8-bit image signals with a difference of 1 gray level precision was amplified after calling the driver lookup table.

[0038] like Figure 1As shown in sub-figure a, the horizontal axis represents the grayscale of the input image signal, and the vertical axis represents the grayscale obtained through the overdrive lookup table. Figure 1 The example shown in Figure a illustrates how to switch the input grayscale to 80 grayscale levels. Figure 1 The following example illustrates the conversion of a 12-bit image signal into an 8-bit image signal, yielding the first signal 241.4 and the second signal 241.6 on either side of 0.5. The first signal 241.4 and the second signal 241.6 are rounded to obtain the third signal 240 grayscale and the fourth signal 241 grayscale. The third signal 240 grayscale and the fourth signal 241 grayscale differ by one grayscale level. This demonstrates that when a 12-bit image signal is converted into an 8-bit image signal, the values ​​on either side of 0.5 will produce a precision difference of one grayscale level after rounding.

[0039] Then, the overdrive grayscale is searched in the overdrive lookup table using the third signal 240 grayscale and the fourth signal 241 grayscale, such as... Figure 1 The first error d1 is obtained from the vertical coordinate of the sub-image a. It can be seen from the figure that the first error d1 is larger because the gray level variation range of the vertical coordinate is larger than that of the horizontal coordinate. Therefore, the difference between the two 8-bit image signals with a gray level difference is amplified after calling the driver lookup table.

[0040] When the display panel uses the third signal 240 grayscale and the fourth signal 241 grayscale to look up the overdrive grayscale display image in the overdrive lookup table, although there is a difference of one grayscale in the 8-bit image signal, the grayscale difference of the overdrive is very large, which causes the image in the display panel to have grayscale difference, thus producing watermark defects.

[0041] Based on the problems discovered by the inventors and the principles underlying these problems, the inventors propose an improvement scheme for this application.

[0042] This application provides a driving method for a display device, comprising: obtaining an initial overdrive lookup table, the initial overdrive lookup table including grayscale data arranged in y rows and y columns, the grayscale data including grayscale binding points and their corresponding overdrive values, and the initial overdrive lookup table supporting the display of i-bit image signals, where y is a positive integer greater than 2 and i is a positive integer greater than 2; obtaining an intermediate lookup table based on the initial overdrive lookup table, defining that both the initial overdrive lookup table and the intermediate lookup table include a dummy diagonal, one end of the dummy diagonal being the first row and the first column, one side of the dummy diagonal being the grayscale rising area, and the other side of the dummy focus line being the grayscale falling area; The ratio of the overdrive values ​​of the first m columns of the grayscale rising region in the intermediate lookup table to the overdrive values ​​of the first m columns of the grayscale rising region in the initial overdrive lookup table is a first preset ratio. The ratio of the overdrive values ​​of the last n columns of the grayscale falling region in the intermediate lookup table to the overdrive values ​​of the last n columns of the grayscale falling region in the initial overdrive lookup table is a second preset ratio. Both the first and second preset ratios are less than 1, and m is a positive integer less than y. A j-bit image signal to be displayed is provided, where j is a positive integer greater than i. The image signal to be displayed is converted into an i-bit target image signal. The overdrive value of the target image signal is found according to the intermediate lookup table.

[0043] The following sections provide detailed descriptions of each example. It should be noted that the order in which the embodiments are described is not intended to limit the preferred order of the embodiments.

[0044] Example 1

[0045] Please see Figures 1 to 4 , Figure 1 A schematic diagram showing the effect comparison before and after the improvement of the driving method of a display device provided in Embodiment 1 of this application; Figure 2 A schematic flowchart illustrating the driving steps of a display device according to Embodiment 1 of this application; Figure 3 This is a schematic diagram illustrating an example of an initial overdrive lookup table for a display device driving method provided in Embodiment 1 of this application; Figure 4 This is a first example schematic diagram of an intermediate lookup table for a display device driving method provided in Embodiment 1 of this application.

[0046] This application provides a driving method for a display device, including steps S100, S200, S300, S400, and S500. The order of the step numbers is not a limitation on the order of the steps.

[0047] S100, obtain the initial overdrive lookup table. The initial overdrive lookup table includes grayscale data of y rows and y columns of array arrangement. The grayscale data includes grayscale binding points and their corresponding overdrive values. The initial overdrive lookup table supports displaying i-bit image signals, where y is a positive integer greater than 2 and i is a positive integer greater than 2.

[0048] Specifically, Figure 3 An example of an initial overdriven lookup table is given, which includes grayscale data arranged in an array of y rows and y columns. Figure 3 In this case, y equals 19. The initial overdrive lookup table can also be called the initial lookup table.

[0049] Specifically, Figure 3 An example of an initial overdrive lookup table is provided, which supports displaying i-bit video signals. Figure 3 In this case, i equals 8.

[0050] S200 or S210: Obtain an intermediate lookup table based on the initial overdrive lookup table. Both the initial overdrive lookup table and the intermediate lookup table are defined to include a dummy diagonal. One end of the dummy diagonal is the first row and the first column. One side of the dummy diagonal is the grayscale rising area, and the other side of the dummy focus line is the grayscale falling area. The ratio of the overdrive values ​​of the first m columns of the grayscale rising area in the intermediate lookup table to the overdrive values ​​of the first m columns of the grayscale rising area in the initial overdrive lookup table is a first preset ratio. The ratio of the overdrive values ​​of the last n columns of the grayscale falling area in the intermediate lookup table to the overdrive values ​​of the last n columns of the grayscale falling area in the initial overdrive lookup table is a second preset ratio. Both the first preset ratio and the second preset ratio are less than 1, and m is a positive integer less than y.

[0051] It should be noted that, in Figure 3 , Figure 4 , Figure 7 In this paper, only the overdrive values ​​of the first two and last two columns are illustrated. The overdrive values ​​of other columns are not illustrated, but this does not affect the explanation of the spirit of the invention.

[0052] It should be noted that, in Figure 3 , Figure 4 Subsequent Figure 7 The example illustrates the relative value data in the initial overdrive lookup table and the intermediate lookup table, for example, Figure 3 The ninth designation, C21, indicates that the grayscale level of the next frame is 24 levels higher than that of the current frame. It should be noted that... Figure 3 , Figure 4 , Figure 7 In the initial lookup table and intermediate lookup tables, the values ​​can also be absolute values, for example, when... Figure 3In the table, number C21 indicates that the grayscale value of the next frame is 24 grayscale levels greater than that of the current frame, and the value of number C21 is 120. The horizontal axis represents the grayscale value of the next frame, and the vertical axis represents the grayscale value of the current frame. The values ​​between the horizontal and vertical axes, or other values ​​in the table, are overdrive values, which can be relative or absolute values ​​as described above. In the driving method of the display device in this application, the overdrive values ​​in the intermediate lookup table are obtained or updated through different steps, while the horizontal and vertical axis values ​​remain unchanged. In this application, the first m columns, last n columns, last s columns, and first r columns all refer to overdrive values ​​other than those on the horizontal and vertical axes, for example... Figure 3 The diagram clearly shows the x-axis, y-axis, first row, second row, first column, and second column.

[0053] Please see Figure 3 The initial overdrive lookup table and Figure 4 The intermediate lookup table defines an initial overdrive lookup table and an intermediate lookup table, both of which include a dummy diagonal 1001. The dummy diagonal 1001 does not actually exist in the initial overdrive lookup table and the intermediate lookup table; it is a dummy line defined to distinguish between grayscale rising areas and grayscale falling areas.

[0054] Please see Figure 3 The initial overdrive lookup table and Figure 4 The intermediate lookup table is used, with one end of the diagonal 1001 arbitrarily designated as the first row and first column, and the other end of the diagonal 1001 arbitrarily designated as the last row and last column.

[0055] Figure 3 and Figure 4 The example illustrates that the table area below the diagonal 1001 is a grayscale rising area, indicating that the grayscale value of the next display frame is greater than the grayscale value of the current display frame. Therefore, in Figure 3 and Figure 4 When representing relative value data, the values ​​in the rising range are positive; Figure 3 and Figure 4 The example illustrates that the table area above the diagonal 1001 is a grayscale decreasing area, indicating that the grayscale value of the next display frame is lower than the grayscale value of the current display frame. Therefore, in Figure 3 and Figure 4 When representing relative value data, the values ​​in the decreasing range are negative.

[0056] Specifically, Figure 4 The example illustrates that the ratio of the overdrive values ​​in the first m columns of the intermediate lookup table to the overdrive values ​​in the first m columns of the initial overdrive lookup table is the first preset ratio, where m = 2 and the first preset ratio is equal to 0.5.

[0057] Specifically, Figure 4 The example illustrates that the ratio of the overdrive values ​​in the last n columns of the intermediate lookup table to the overdrive values ​​in the last n columns of the initial overdrive lookup table is the second preset ratio, where n = 2 and the second preset ratio is equal to 0.8.

[0058] Specifically, the other overdriven values ​​in the first m columns and the last n columns of the intermediate lookup table are the same as the overdriven values ​​in the initial overdriven lookup table.

[0059] S300 provides a j-bit image signal to be displayed, where j is a positive integer greater than i.

[0060] Specifically, a j-bit image signal to be displayed is provided, where j is a positive integer greater than i. In marketed display products or terminal products, the image signals of display panels or terminal products may be 6 bits, 8 bits, 10 bits, 12 bits, or 14 bits. When j equals 14, i can be any one of 6, 8, 10, or 12; when j equals 12, i can be any one of 6, 8, or 10; when j equals 10, i can be any one of 6 or 8; and when j equals 8, i can be 6. In actual display products or terminal products, the values ​​of j and i are determined according to the specific circumstances. This application uses j equal to 12 and i equal to 8 as an example.

[0061] S400 converts the image signal to be displayed into an i-bit target image signal.

[0062] Specifically, the image signal to be displayed is converted into an i-bit target image signal, that is, a j-bit image signal to be displayed is converted into an i-bit target image signal, for example, a 12-bit image signal to be displayed is converted into an 8-bit target image signal.

[0063] S500 searches for the overdrive value of the target image signal according to the intermediate lookup table.

[0064] Specifically, the overdrive values ​​are used to display the image.

[0065] Specifically, the overdrive value of the target image signal is found according to the intermediate lookup table. That is, the overdrive value in the intermediate lookup table is the first overdrive value of the target image signal. For example, if the target image signal currently has a grayscale level of 8 and the grayscale level to be displayed is 255, then... Figure 4 If the target image signal is switched from the current gray level of 8 to the gray level of 255 to be displayed, then the first overdrive value of the target image signal is 0 gray level.

[0066] In some embodiments, m is a positive integer less than or equal to 5, and n is a positive integer less than or equal to 5.

[0067] Specifically, based on the inventor's watermark experiments, the inventor discovered that the first 5 columns and the last 5 columns have a significant negative impact on watermarks. Therefore, m is set to a positive integer less than or equal to 5, and n is set to a positive integer less than or equal to 5. Preferably, m equals 2 and n equals 2, so that the watermarks disappear or become invisible to the naked eye.

[0068] In some embodiments, the first preset ratio ranges from 0.4 to 0.6; the second preset ratio ranges from 0.7 to 0.9.

[0069] Specifically, based on the inventor's watermark experiments, the inventor discovered that the first preset ratio ranges from 0.4 to 0.6, and the second preset ratio ranges from 0.7 to 0.9, which can reduce or eliminate watermark defects.

[0070] In some embodiments, the first preset ratio is equal to 0.5 and the second preset ratio is equal to 0.8.

[0071] Specifically, based on the inventor's watermark experiments, the inventor discovered that a first preset ratio of 0.5 and a second preset ratio of 0.8 can better reduce or eliminate watermark defects.

[0072] In some embodiments, j equals 12 and i equals 8. This application illustrates the conversion of 12 bits into 8 bits of image signal.

[0073] Specifically, the drive or control system in the display device includes multiple processing modules. The input display signal is usually 12 bits. In order to reduce the size of the processing module, the display device stores an initial overdrive lookup table that supports 8-bit display signals. In the drive or control system of the display device, it is necessary to convert the 12-bit display signal into an 8-bit display signal in order to look up the initial overdrive lookup table.

[0074] In some embodiments, the method for converting the image signal to be displayed into an i-bit target image signal is linear interpolation.

[0075] Specifically, the image signal to be displayed can be converted into an i-bit target image signal using the following formula:

[0076]

[0077] Where Fx represents the LOD bilinear interpolation result;

[0078] A and B represent the two endpoints of bilinear interpolation;

[0079] The binding point represents the LOD binding point corresponding to endpoints A and B;

[0080] @j indicates that it has no numerical meaning and refers to j bits of image signal;

[0081] @i indicates that it has no numerical meaning and refers to i bits of image signal;

[0082] FIX() represents the rounding function;

[0083] Cur represents the current grayscale;

[0084] >> indicates a logical right shift.

[0085] Please see Figure 1 The sub-figure in section b illustrates the process of finding the overdrive value of the target image signal according to the intermediate lookup table after improvement in this embodiment, that is, it illustrates the process of finding the first overdrive value of the target image signal according to the intermediate lookup table after improvement in this embodiment. For example... Figure 1 As shown in the sub-figure in the middle (b), the horizontal axis represents the grayscale of the input image signal, and the vertical axis represents the grayscale obtained through the overdrive lookup table. Figure 1 The neutron b-image is illustrated using the example of switching the input grayscale to 80 grayscale levels. Figure 1 The following example illustrates how a 12-bit image signal is converted to an 8-bit image signal, resulting in the first signal 241.4 and the second signal 241.6 on either side of 0.5. The first and second signals 241.4 and 241.6 are rounded to obtain the third signal 240 grayscale and the fourth signal 241 grayscale. Then, the overdrive grayscale / overdrive value is searched in an intermediate lookup table using the third signal 240 grayscale and the fourth signal 241 grayscale. Figure 1 The vertical axis of the neutron b-plot yields the second error d2. The plot shows that the improved second error d2 is significantly smaller than the unimproved first error d1.

[0086] Therefore, in this embodiment, an intermediate lookup table is obtained according to the initial overdrive lookup table, and the first overdrive value of the target image signal is found according to the intermediate lookup table. When the j-bit / 12-bit image signal is converted into an i-bit / 8-bit image signal, the difference in overdrive values ​​of the two i / 8-bit image signals with a gray level precision difference after calling the intermediate lookup table is reduced, thereby reducing or weakening, or even avoiding the problem of watermark defects.

[0087] Implementation of Column 2

[0088] Please see Figure 5 and Figure 6 , Figure 5 This is a schematic flowchart of a driving method for a display device provided in Embodiment 2 of this application; Figure 6 This is a schematic diagram illustrating an example of an intermediate lookup table provided in Embodiment 2 of this application. Figure 6 and Figure 4 They are the same, the difference lies in Figure 6The added numbers indicate the first line, the second line, the first preset line, and the second preset line.

[0089] The driving method of the display device in this embodiment is a further description based on the driving method of the display device in any of the above embodiments.

[0090] This embodiment provides a driving method for a display device, wherein step S200 above includes S210, S220, and S230. Compared with embodiment one, step S200 in this embodiment further includes S220 and S230.

[0091] In this embodiment, the method for obtaining an intermediate lookup table based on an initial overdrive lookup table further includes steps S220 and S230.

[0092] S220, the last s columns of the gray-scale decreasing region in the intermediate lookup table are linearly interpolated based on the overdrive values ​​of the first row and the first preset row of the corresponding column of the gray-scale decreasing region in the intermediate lookup table to obtain the first linear interpolation result, where s is a positive integer and less than or equal to n.

[0093] S230, update the overdrive value of the row between the first row and the first preset row in the intermediate lookup table according to the first linear interpolation result.

[0094] In this embodiment, step S200 includes steps S210, S220, and S230.

[0095] Specifically, the first row and the first preset row of the corresponding column in the last s columns of the gray-scale decreasing region, the first row of a column in the intermediate lookup table that is located in the gray-scale decreasing region is the first row, and the last row of that column in the intermediate lookup table that is located in the gray-scale decreasing region and is involved in or participates in linear interpolation calculation is the first preset row.

[0096] To further explain, the first linear interpolation result is obtained by performing linear interpolation calculation based on the overdrive values ​​of the first row and the first preset row of the corresponding column in the gray-scale decreasing region of the intermediate lookup table. This means that when s=1, the first row of the last column in the intermediate lookup table located in the gray-scale decreasing region is the first row, and the last row of the column in the intermediate lookup table located in the gray-scale decreasing region and participating in the linear interpolation calculation is the first preset row; when s=2, the first row of the last column in the intermediate lookup table located in the gray-scale decreasing region is the first row, and the last row of the last column in the intermediate lookup table located in the gray-scale decreasing region and participating in the linear interpolation calculation is the first preset row, or, the first row of the second-to-last column in the intermediate lookup table located in the gray-scale decreasing region is the first row, and the last row of the second-to-last column in the intermediate lookup table located in the gray-scale decreasing region and participating in the linear interpolation calculation is the first preset row.

[0097] In some embodiments, the grayscale value of the first preset row is less than or equal to 96.

[0098] In some embodiments, s equals 2.

[0099] Specifically, according to the inventor's experimental verification, when the grayscale value of the first preset row is less than or equal to 96, or / and s equals 2, the watermark defect improvement effect is better.

[0100] For example, if s equals 1 and the grayscale value of the first preset row is equal to 96, then the overdrive values ​​of the first row in the grayscale decreasing region of the last column to the rows with grayscale values ​​less than or equal to 96 are linearly interpolated, and the intermediate lookup table is updated.

[0101] For example, if s equals 2 and the grayscale value of the first preset row is equal to 96, then the overdrive values ​​of the first row in the grayscale decreasing region of the last column to the rows with grayscale values ​​less than or equal to 96 are linearly interpolated and the intermediate lookup table is updated; at the same time, the overdrive values ​​of the first row in the grayscale decreasing region of the second to last column to the rows with grayscale values ​​less than or equal to 96 are linearly interpolated and the intermediate lookup table is updated.

[0102] More specifically, Figure 6 The diagram shows that s equals 2, the grayscale value of the first preset row is 96, the first number 91 represents the first row of the last column, the second number 92 represents the first preset row of the last column, the third number 81 represents the first row of the second to last column, and the fourth number 82 represents the first preset row of the second to last column.

[0103] Implementing Column 3

[0104] Please see Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the first driving step proposed in Embodiment 3 of this application; Figure 8 This is a schematic diagram of the second driving step proposed in Embodiment 3 of this application. In some embodiments, based on Embodiment 1 or Embodiment 2, the method for obtaining an intermediate lookup table according to the initial overdrive lookup table further includes: steps S21 and S22.

[0105] S21, take the first r columns of the gray-scale rising area in the intermediate lookup table and perform linear interpolation calculation based on the overdrive values ​​of the second first row and the second preset row of the corresponding column of the gray-scale rising area in the intermediate lookup table to obtain the second linear interpolation result, where r is a positive integer and less than or equal to m.

[0106] S22, update the overdrive value of the row between the second first row and the second preset row in the intermediate lookup table according to the second linear interpolation result.

[0107] Figure 7As illustrated, based on Embodiment 1, the method for obtaining an intermediate lookup table from an initial overdrive lookup table further includes steps S21 and S22. That is, the method for obtaining an intermediate lookup table from an initial overdrive lookup table includes steps S210, S21, and S22.

[0108] Figure 8 As illustrated, based on Embodiment 2, the method for obtaining an intermediate lookup table from the initial overdrive lookup table further includes steps S21 and S22. That is, the method for obtaining an intermediate lookup table from the initial overdrive lookup table includes steps S210, S220, S230, S21, and S22.

[0109] In some embodiments, the second preset grayscale is less than or equal to 96.

[0110] In some embodiments, r equals 2.

[0111] Specifically, according to the inventor's experimental verification, when the grayscale value of the first preset row is less than or equal to 96, or / and s equals 2, the watermark defect improvement effect is better.

[0112] The definition of the second first row in this embodiment is the same as or similar to that of the first first row in Embodiment 2. The definition of the second preset row in this embodiment is the same as or similar to that of the first preset row in Embodiment 2, and will not be repeated here.

[0113] More specifically, Figure 6 The diagram shows that r equals 2, the second preset grayscale equals 96, the fifth number 11 represents the second first row of the first column, the sixth number 12 represents the second preset row of the first column, the seventh number 21 represents the second first row of the second column, and the eighth number 12 represents the second preset row of the second column.

[0114] Figure 9 This is a schematic diagram showing the effect comparison before and after the improvement of the driving method of a display device provided in Embodiment 3 of this application.

[0115] Please see Figure 9 , Figure 9 Subgraph of a in the middle and Figure 1 The subgraph in the middle b is the same. Figure 9 Subgraph of a in the middle and Figure 1 The sub-figures in the middle (b) all illustrate the second error d2. Figure 9 The sub-figure in Figure b illustrates the process of finding the second overdrive value of the target image signal according to the intermediate lookup table after improvement / update in Embodiment 3. For example... Figure 9 As shown in the sub-figure in the middle (b), the horizontal axis represents the grayscale of the input image signal, and the vertical axis represents the grayscale obtained through the overdrive lookup table. Figure 1 The sub-image in section b uses the example of switching the input grayscale to 80 grayscale levels for illustration. Figure 1The example in the middle b sub-image illustrates the transformation of a 12-bit image signal into an 8-bit image signal, yielding the first signal 241.4 and the second signal 241.6 on either side of 0.5. The first signal 241.4 and the second signal 241.6 are rounded to obtain the third signal 240 grayscale and the fourth signal 241 grayscale. Then, the driving value is searched in the intermediate lookup table / second intermediate lookup table using the third signal 240 grayscale and the fourth signal 241 grayscale, such as... Figure 9 The vertical axis of the subplot b is used to obtain the third error d3. It can be seen from the figure that the improved third error d3 is significantly reduced compared to the unimproved second error d2.

[0116] Therefore, in this embodiment, after updating the intermediate lookup table and searching for the overdrive value of the target image signal according to the intermediate lookup table, when the j-bit / 12-bit image signal is converted into an i-bit / 8-bit image signal, the difference in the overdrive value of the two i / 8-bit image signals with a gray level precision difference after calling the intermediate lookup table is further reduced, thereby further reducing or weakening, or even avoiding the problem of watermark defects.

[0117] It should be noted that in the process of converting or converting and updating the intermediate lookup table in step S200 in the above embodiments, some grayscale values ​​that are not integers may be obtained. In this case, the grayscale values ​​in the intermediate lookup table are integers obtained by rounding algorithm.

[0118] The driving method of a display device provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this application. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A driving method for a display device, characterized in that, include: Obtain an initial overdrive lookup table, which includes grayscale data arranged in y rows and y columns of an array. The grayscale data includes grayscale binding points and their corresponding overdrive values. The initial overdrive lookup table supports displaying i-bit image signals, where y is a positive integer greater than 2 and i is a positive integer greater than 2. An intermediate lookup table is obtained based on the initial overdrive lookup table. Both the initial overdrive lookup table and the intermediate lookup table are defined to include a dummy diagonal. One end of the dummy diagonal is the first row and the first column. One side of the dummy diagonal is the grayscale ascending region, and the other side is the grayscale descending region. The ratio of the overdrive values ​​of the first m columns of the grayscale ascending region in the intermediate lookup table to the overdrive values ​​of the first m columns of the grayscale ascending region in the initial overdrive lookup table is a first preset ratio. The ratio of the overdrive values ​​of the last n columns of the grayscale descending region in the intermediate lookup table to the overdrive values ​​of the last n columns of the grayscale descending region in the initial overdrive lookup table is a second preset ratio. Both the first preset ratio and the second preset ratio are less than 1, and m is a positive integer less than y. Provide a j-bit image signal to be displayed, where j is a positive integer greater than i; Convert the image signal to be displayed into the i-bit target image signal; The overdrive value of the target image signal is found according to the intermediate lookup table.

2. The driving method for the display device as described in claim 1, characterized in that, m is a positive integer less than or equal to 5, and n is a positive integer less than or equal to 5.

3. The driving method for the display device as described in claim 1, characterized in that, The first preset ratio ranges from 0.4 to 0.6; The second preset ratio ranges from 0.7 to 0.

9.

4. The driving method for the display device as described in claim 3, characterized in that, The first preset ratio is equal to 0.5, and the second preset ratio is equal to 0.

8.

5. The driving method for the display device as described in claim 1, characterized in that, j equals 12, i equals 8.

6. The driving method for the display device as described in claim 1, characterized in that, The method for "converting the image signal to be displayed into the i-bit target image signal" is linear interpolation.

7. The driving method for the display device as described in claim 1, characterized in that, The method for obtaining the intermediate lookup table based on the initial overdrive lookup table further includes: The last s columns of the gray-scale decreasing region in the intermediate lookup table are linearly interpolated based on the overdrive values ​​of the first row and the first preset row of the corresponding column of the gray-scale decreasing region in the intermediate lookup table to obtain the first linear interpolation result, where s is a positive integer and less than or equal to n. Update the overdrive value of the row between the first row and the first preset row in the intermediate lookup table based on the first linear interpolation result.

8. The driving method for the display device as described in claim 7, characterized in that, The method for obtaining the intermediate lookup table based on the initial overdrive lookup table further includes: The first r columns of the gray-scale rising area in the intermediate lookup table are linearly interpolated based on the overdrive values ​​of the second first row and the second preset row of the corresponding column of the gray-scale rising area in the intermediate lookup table to obtain the second linear interpolation result, where r is a positive integer and less than or equal to m. Update the overdrive value of the row between the second first row and the second preset row in the intermediate lookup table based on the second linear interpolation result.

9. The driving method for the display device as described in claim 8, characterized in that, The grayscale value of the first preset row is less than or equal to 96, and the grayscale value of the second preset row is less than or equal to 96.

10. The driving method for the display device as described in claim 9, characterized in that, s equals 2 or / and r equals 2.

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