Compensation method and compensation device for display panel

Abstract

The embodiment of the present invention discloses a compensation method and compensation device for a display panel. The compensation method for a display panel includes: obtaining the first display data of the curved display area when the display panel displays a preset grayscale at a preset position; determining the compensation target value of the area to be compensated in the curved display area; determining the compensation value of the sub-pixel to be compensated in the area to be compensated when the preset grayscale is displayed according to the first display data of the area to be compensated, the compensation target value and the compensation control function, so that after compensation, when the area to be compensated is observed at the preset position, the display brightness of the area to be compensated gradually decreases in the direction away from the flat display area. The embodiment of the present invention improves the display effect of the curved display area, thereby improving the overall display effect of the display panel.

Description

Technical Field

[0001] The embodiments of the present invention relate to display technology, and more particularly to a compensation method and a compensation device for a display panel. Background Art

[0002] With the development of display technology, curved display panels have emerged to meet users' requirements for display effects. However, the display effects of existing curved display panels are poor, which affects the user experience. Summary of the invention

[0003] The present invention provides a compensation method and a compensation device for a display panel, so as to improve the display effect of a curved display area, thereby improving the overall display effect of the display panel.

[0004] In a first aspect, an embodiment of the present invention provides a compensation method for a display panel, wherein the display panel includes a flat display area and a curved display area located at least on one side of the flat display area, and the compensation method includes:

[0005] Acquiring first display data of the curved display area at a preset position when the display panel displays a preset gray scale;

[0006] Determining a compensation target value of the area to be compensated in the curved display area;

[0007] The compensation value of the sub-pixel to be compensated in the area to be compensated when displaying a preset gray scale is determined according to the first display data of the area to be compensated, the compensation target value and the compensation control function, so that after compensation, when the area to be compensated is observed at the preset position, the display brightness of the area to be compensated gradually decreases in the direction away from the planar display area.

[0008] Optionally, determining the compensation value of the sub-pixel to be compensated in the area to be compensated when displaying a preset gray scale according to the first display data of the area to be compensated, the compensation target value and the compensation control function includes:

[0009] Determine, according to the first display data of each sub-pixel in the area to be compensated, a brightness attenuation function of the display brightness of each sub-pixel in the area to be compensated along the direction from the planar display area to the curved display area;

[0010] Determine the compensation control function according to the brightness attenuation function, wherein the compensation control function is less than 1;

[0011] The difference between the compensation target value corresponding to the sub-pixel to be compensated and the corresponding first display data is calculated, and the product of the difference and the compensation control function is determined as the compensation value of the sub-pixel to be compensated.

[0012] Optionally, determining a brightness attenuation function of the display brightness of each sub-pixel in the area to be compensated along a direction from the planar display area to the curved display area according to the first display data of each sub-pixel in the area to be compensated includes:

[0013] Dividing the area to be compensated into a plurality of first compensation sub-areas along an extending direction of a second boundary of the area to be compensated adjacent to the planar display area;

[0014] Determine, according to the display data of each first sub-compensation area, a sub-brightness attenuation function of the display brightness of each sub-pixel in each first sub-compensation area in a direction from the planar display area to the curved display area;

[0015] Determining the brightness attenuation function according to a plurality of sub-brightness attenuation functions corresponding to the first sub-compensation areas;

[0016] The determining the compensation control function according to the brightness attenuation function comprises:

[0017] The coefficient value of the compensation control function is determined according to the coefficient value of the brightness attenuation function, wherein the compensation control function and the brightness attenuation function are of the same function type.

[0018] Optionally, the area to be compensated further includes a first boundary away from the flat display area; and determining, according to the display data of each first sub-compensation area, a sub-brightness attenuation function of the display brightness of each sub-pixel in each first sub-compensation area along a direction from the flat display area to the curved display area includes:

[0019] Determining a sub-brightness attenuation function of each first sub-compensation area according to an average value of display data of a plurality of sub-pixels located on the first boundary in each first sub-compensation area and an average value of display data of a plurality of sub-pixels located on the second boundary; wherein the sub-brightness attenuation functions of the plurality of first sub-compensation areas are of the same type;

[0020] Determining the brightness attenuation function according to the sub-brightness attenuation functions corresponding to the first sub-compensation areas includes:

[0021] The coefficient value of the brightness attenuation function is determined by taking an average of the coefficient values ​​of the sub-brightness attenuation functions respectively corresponding to the plurality of the first sub-compensation areas.

[0022] Optionally, before determining the compensation target value of the area to be compensated in the curved display area, the method further includes:

[0023] Determine a position along a direction from the flat display area to the curved display area where a brightness change rate of the curved display area is greater than a preset value as a first boundary of the area to be compensated;

[0024] An area between a second boundary of the curved display area adjacent to the flat display area and the first boundary is determined as the area to be compensated.

[0025] Optionally, determining the compensation target value of the area to be compensated includes:

[0026] Acquiring second display data of the planar display area at the preset position when the display panel displays a preset gray scale;

[0027] Determining a partial area of ​​the planar display area adjacent to the area to be compensated as a compensation reference area;

[0028] The compensation target value of the area to be compensated is determined according to the display data of the compensation reference area.

[0029] Optionally, determining the compensation target value of the area to be compensated according to the display data of the compensation reference area includes:

[0030] determining the average value of the display data of the sub-pixels of the same color as the sub-pixel to be compensated in the compensation reference area as the compensation target value; or,

[0031] Dividing the area to be compensated into a plurality of second compensation sub-areas along an extending direction of a second boundary of the curved display area adjacent to the flat display area;

[0032] Dividing the compensation reference area into a plurality of sub-reference areas along an extension direction of a second boundary of the curved display area adjacent to the flat display area; wherein each sub-reference area corresponds to one second sub-compensation area;

[0033] The compensation target value of the second compensation sub-area corresponding to each sub-reference area is determined according to the display data of the sub-reference area.

[0034] Optionally, determining the compensation target value of the second sub-compensation area corresponding to each sub-reference area according to the display data thereof includes:

[0035] The compensation target value of the corresponding second sub-compensation area is determined according to the average value of the display data of the sub-pixels of the same color as the sub-pixel to be compensated in each sub-reference area.

[0036] Optionally, the method further includes:

[0037] The compensation value of the area of ​​the curved display area except the area to be compensated is determined to be zero.

[0038] In a second aspect, an embodiment of the present invention further provides a compensation device for a display panel, wherein the display panel comprises a flat display area and a curved display area located at least on one side of the flat display area, and the compensation device comprises:

[0039] A display data acquisition module, used for acquiring, at a preset position, first display data of the curved display area when the display panel displays a preset gray scale;

[0040] A compensation target value determination module, used to determine a compensation target value of the area to be compensated in the curved display area;

[0041] A compensation value determination module is used to determine the compensation value of the sub-pixel to be compensated in the area to be compensated when displaying a preset grayscale according to the first display data of the area to be compensated, the compensation target value and the compensation control function, so that when the area to be compensated is observed at the preset position after compensation, the display brightness of the area to be compensated gradually decreases in the direction away from the planar display area.

[0042] In the embodiment of the present invention, the first display data of the curved display area when the display panel displays a preset gray scale is obtained at a preset position, and the compensation target value of the area to be compensated is determined. According to the first display data of the area to be compensated, the compensation target value and the compensation control function, the compensation value of the sub-pixel to be compensated in the area to be compensated when the preset gray scale is displayed is determined, so that after the compensation, when the area to be compensated is observed at the preset position, the display brightness of the area to be compensated gradually decreases in the direction away from the flat display area. By using the compensation control function to correct the compensation value or the compensation target value, the compensation value finally determined can not only compensate the display unevenness to a certain extent, but also avoid over-compensation of the curved display area, so that when the display screen is viewed at the preset position after compensation, the display brightness of the curved display area gradually decreases in the direction away from the flat display area, and the display brightness conforms to the curvature change of the flat display area, so that the display effect is more natural, and when the display screen is viewed from the side, there is no problem of excessive brightness of the curved display area, which improves the display effect of the curved display area, thereby improving the overall display effect of the display panel. In addition, the embodiment only needs to collect display data at the same position, and does not need to change the position of the camera, and the compensation process is simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a flow chart of a compensation method for a display panel provided by an embodiment of the present invention;

[0044] Figure 2 is a schematic diagram of a display panel provided by an embodiment of the present invention;

[0045] Figure 3 is a schematic diagram of an attenuation function provided by an embodiment of the present invention;

[0046] Figure 4 is a schematic diagram of another display panel provided by an embodiment of the present invention;

[0047] Figure 5 is a schematic diagram of another display panel provided by an embodiment of the present invention;

[0048] Figure 6 is a schematic diagram of another display panel provided by an embodiment of the present invention;

[0049] Figure 7 It is a schematic diagram of a compensation device for a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0051] Mura mainly refers to the phenomenon of uneven brightness within the display panel when displaying grayscale images. This phenomenon is mostly caused by adverse factors in the production process of the display panel. As the size of display panels becomes larger and larger, the requirements for panel production technology are also getting higher and higher, and the probability of Mura on the panel is also increasing. Demura is the process of compensating the display panel and eliminating Mura.

[0052] Through research, the inventors found that for a curved display panel, its two long sides are arc-shaped surfaces or waterfall-shaped surfaces with large curvatures. Currently, a high-precision CCD camera is required to collect screen brightness data. However, when the camera takes a picture directly above the display panel to obtain brightness information, the main brightness of both sides is reflected to the side, causing distortion of the actual curved surface data, resulting in poor display effect of the curved display area after Demura compensation.

[0053] This embodiment provides a compensation method for a display panel, wherein the display panel includes a flat display area and a curved display area located at at least one side of the flat display area. Figure 1 is a flow chart of a compensation method for a display panel provided by an embodiment of the present invention, with reference to Figure 1 , the method comprising:

[0054] S110, acquiring first display data of the curved display area at a preset position when the display panel displays a preset gray scale.

[0055] Figure 2 is a schematic diagram of a display panel provided by an embodiment of the present invention, with reference to Figure 2The flat display area 11 and the curved display area 12 are both used to display images. The display panel may include one curved display area 12 or two flat display areas 12. The two flat display areas 12 may be located on opposite sides of the flat display area 11. In addition, the display panel may also include multiple curved display areas 12. The present embodiment does not specifically limit the number of the curved display areas 12.

[0056] The first display data may be brightness data or grayscale data when the curved display area 12 displays a monochrome picture of a preset grayscale. The preset grayscale may include grayscales such as 16, 32, 64, or 192. In addition, the preset position may be a position where the user most often views the display picture, and an exemplary preset position may be any position directly above the flat display area 11 of the display panel, such as the preset position may be a position directly above the center of the flat display area 11.

[0057] Specifically, the first display data can be collected by using a lighting platform image generator, a high-definition CCD camera, a computer device, a horizontal stage, a sliding bracket with high-precision electric height control, a manipulator that can perform slight wiping, and a sensor with a positioning function. The horizontal stage is used to flatten the display panel so that the shooting height remains horizontal. The manipulator that can perform slight wiping is used to remove dust from the surface of the display panel. The sensor with a positioning function is used to locate the position of the display panel. The sliding bracket with high-precision electric height control is used to adjust the relative position between the display panel and the CCD camera. The lighting platform image generator is used to light up the display panel. The computer device transmits a specific picture to the lighting platform image generator to drive the display panel to display a specific picture. The CCD camera takes a picture at a preset position, and the CCD camera obtains display data by sampling data of a specific picture. The picture collected by the CCD camera can determine the pixel position coordinates of the photographable area, the position of the junction between the flat display area and the curved display area, and the position of all physical frames of the display panel.

[0058] Exemplarily, the display panel can be driven to display monochrome images with grayscales of 16, 32, 64, 128, 192, etc. in sequence, and the CCD camera collects the display image of the display panel directly above the display panel, thereby obtaining the first display data when the curved display area displays monochrome images with grayscales of 16, 32, 64, 128 and 192, etc.

[0059] S120: Determine a compensation target value of the area to be compensated in the curved display area.

[0060] Among them, the area to be compensated is the area to be compensated in the curved display area. The area to be compensated may be a partial area of ​​the curved display area. An exemplary area to be compensated may be an area of ​​the curved display area adjacent to the flat display area. The area to be compensated may be determined based on the first display data, or may be determined based on the need for compensation, and this embodiment does not make any specific limitations. The compensation target value when setting the grayscale for a sub-pixel of a certain color in the curved display area may be determined based on the display data when setting the grayscale for a sub-pixel of the color in the flat display area, or may be set as needed, and this embodiment does not make any specific limitations. The compensation target value may be a grayscale value, a voltage value, or a brightness value. In addition, the same compensation target value may be used for the entire area to be compensated, or different compensation target values ​​may be used for different areas of the area to be compensated.

[0061] S130, determining the compensation value of the sub-pixel to be compensated in the area to be compensated when displaying a preset gray scale according to the first display data of the area to be compensated, the compensation target value and the compensation control function, so that after compensation, when the area to be compensated is observed at the preset position, the display brightness of the area to be compensated gradually decreases in the direction away from the planar display area.

[0062] Specifically, refer to Figure 2 , the compensation control function is used to correct the compensation data of the curved display area 12, so that the display effect of the curved display area after compensation conforms to the curved shape of the curved display area. The compensation control function can be determined according to the curvature of the curved display area 12, or according to the brightness attenuation trend when the curved display area 12 displays the same grayscale along the direction from the plane display area 11 to the curve display area 12. The difference between the first display data of the sub-pixel to be compensated and the compensation target value can be used as the initial compensation value of the sub-pixel to be compensated, and the initial compensation value can be adjusted using the compensation control function to appropriately reduce the initial compensation value, so that the brightness of the display area to be compensated after compensation gradually decreases in the direction away from the plane display area 11. The compensation target value of the sub-pixel to be compensated can also be adjusted by the compensation control function, so that the adjusted compensation target value gradually decreases in the direction away from the plane display area, and the compensation value is obtained by subtracting the adjusted compensation target value from the first display data of the sub-pixel to be compensated.

[0063] Specifically, since the first display data is the display data of the curved display area when observed from above the display panel, when the display data of the curved display area are compensated to be the same as the target compensation value, when the display screen is observed from the side, the display brightness of the curved display area will be greater than the brightness corresponding to the target compensation value, so that the curved display area is over-compensated. The compensation value or the target compensation value is corrected by using a compensation control function, so that when the area to be compensated is observed at the preset position after compensation, the display brightness of the area to be compensated gradually decreases in the direction away from the flat display area, so that the difference between a part of the curved display area and the flat display area can be compensated, and at the same time, the curved display area will not be over-compensated, so that when the display screen is viewed at the preset position after compensation, the display brightness of the curved display area gradually decreases in the direction away from the flat display area, and the display brightness conforms to the curvature change of the flat display area, so that the display effect is more natural, and when the display screen is viewed from the side, there will be no problem of excessive brightness of the curved display area.

[0064] Exemplarily, the first display data is a red display image when the flat display area displays 16 gray scales. According to the first display data of the area to be compensated, the compensation target value corresponding to the 16 gray scale red image, and the compensation control function, the compensation value when the area to be compensated displays 16 gray scales can be determined. By analogy, the compensation value of the red image of other gray scales displayed in the curved display area can be obtained, as well as the compensation values ​​of each gray scale when the curved display area displays green and blue images.

[0065] In the embodiment of the present invention, the first display data of the curved display area when the display panel displays a preset gray scale is obtained at a preset position, and the compensation target value of the area to be compensated is determined. According to the first display data of the area to be compensated, the compensation target value and the compensation control function, the compensation value of the sub-pixel to be compensated in the area to be compensated when the preset gray scale is displayed is determined, so that after the compensation, when the area to be compensated is observed at the preset position, the display brightness of the area to be compensated gradually decreases in the direction away from the flat display area. By using the compensation control function to correct the compensation value or the compensation target value, the compensation value finally determined can not only compensate the display unevenness to a certain extent, but also avoid over-compensation of the curved display area, so that when the display screen is viewed at the preset position after compensation, the display brightness of the curved display area gradually decreases in the direction away from the flat display area, and the display brightness conforms to the curvature change of the flat display area, so that the display effect is more natural, and when the display screen is viewed from the side, there is no problem of excessive brightness of the curved display area, which improves the display effect of the curved display area, thereby improving the overall display effect of the display panel. In addition, the embodiment only needs to collect display data at the same position, and does not need to change the position of the camera, and the compensation process is simple to operate.

[0066] Optionally, determining the compensation value of the sub-pixel to be compensated in the area to be compensated when displaying a preset gray scale according to the first display data of the area to be compensated, the compensation target value and the compensation control function includes:

[0067] Determine, according to the first display data of each sub-pixel in the area to be compensated, a brightness attenuation function of the display brightness of each sub-pixel in the area to be compensated along the direction from the planar display area to the curved display area;

[0068] Determine the compensation control function according to the brightness attenuation function, wherein the compensation control function is less than 1;

[0069] The difference between the compensation target value corresponding to the sub-pixel to be compensated and the corresponding first display data is calculated, and the product of the difference and the compensation control function is determined as the compensation value of the sub-pixel to be compensated.

[0070] Specifically, the area to be compensated may include a plurality of pixel columns, and the extension direction of the pixel columns is parallel to the boundary where the plane display area and the curved display area intersect. Each pixel column includes a plurality of pixel units, and each pixel unit includes at least three light-emitting units of different light-emitting colors. The display data of the sub-pixels of the preset light-emitting colors in each pixel column in the area to be compensated may be averaged to obtain the display data mean of the sub-pixels of the preset light-emitting colors in each pixel column, and the brightness attenuation function of the sub-pixels of the color may be obtained according to the display data mean of each pixel column. Exemplarily, the brightness attenuation function corresponding to the red sub-pixel is determined according to the display data mean of the red sub-pixel in each pixel column.

[0071] In addition, determining the compensation control function according to the brightness attenuation function may be to set the compensation control function and the brightness attenuation function to use the same function type, and fine-tune the coefficient of the brightness attenuation function as the coefficient of the brightness attenuation function. Alternatively, a curve may be fitted according to the attenuation trend of the brightness attenuation function, and the curve may be determined as the compensation control function.

[0072] In this embodiment, the compensation value is obtained by multiplying the difference between the compensation target value of the sub-pixel to be compensated and the first display data by the compensation control function. Since the compensation control function is less than 1, the compensation value is reduced to a certain extent relative to the difference, thereby avoiding over-compensation of the curved display area, and the compensation control function is determined by the brightness attenuation function, so that the compensation value obtained after the compensation control function reduces the difference corresponding to the sub-pixels at each position is consistent with the shape change of the display panel, so that after the sub-pixel to be compensated is compensated with the final compensation value corrected by the compensation control function, the brightness change trend of the area to be compensated is more consistent with the shape change of the area to be compensated, thereby improving the display effect of the curved display area.

[0073] Optionally, determining the compensation control function according to the brightness attenuation function includes:

[0074] The coefficient value of the compensation control function is determined according to the coefficient value of the brightness attenuation function, wherein the compensation control function and the brightness attenuation function are of the same function type.

[0075] Exemplarily, the brightness attenuation function of the curved display area may be L=ab*exp(c*x), where a, b and c are coefficients determined according to actual brightness, x is the horizontal coordinate of the sub-pixel of the curved display area, i.e., the position in the direction from the plane display area to the curved display area, and L is the brightness of the sub-pixel. Then the compensation control function may be determined as d*b*exp(c*x). Where d is a real number. d is an adjustment factor, which is used to limit the reduction degree of the compensation value of the compensation control function. d may be determined according to the actual compensation effect.

[0076] Figure 3 is a schematic diagram of an attenuation function provided by an embodiment of the present invention, for example, with reference to Figure 3 , y1 is the brightness attenuation function of the area to be compensated, y1 = 120-20*exp(0.01*x). y2 is the compensation value, y2 = 100-y, y is the actual brightness of the sub-pixel, and 100 is the compensation target value. y3 is the compensation value corrected by the compensation control function, y3 = y2*[0.009*20*exp(0.01*x)], where the compensation control function = 0.009*20*exp(0.01*x), y4 is the brightness after compensation, y4 = y3+y. Figure 3 The adjustment factor of the compensation control function shown in is d=0.009.

[0077] It can be seen from the curve corresponding to y2 that the difference between the target compensation value and the actual brightness of the sub-pixel to be compensated gradually increases. After the difference is reduced by the compensation control function, the obtained compensation value (reference y3) is reduced relative to the difference. The farther the sub-pixel is from the plane display area, the greater the reduction in its compensation value relative to the corresponding difference in y2. Therefore, the brightness y4 compensated by the compensation value of y3 gradually decreases in the direction away from the plane display area, and the brightness change trend of the area to be compensated is more in line with the shape change of the area to be compensated.

[0078] It should be noted that Figure 3 A brightness attenuation function and a compensation control function are merely shown for exemplary purposes and are not intended to limit the present invention.

[0079] Optionally, determining a brightness attenuation function of the display brightness of each sub-pixel in the area to be compensated along a direction from the planar display area to the curved display area according to the first display data of each sub-pixel in the area to be compensated includes:

[0080] Dividing the area to be compensated into a plurality of first compensation sub-areas along an extending direction of a second boundary of the area to be compensated adjacent to the planar display area;

[0081] Determine, according to the display data of each first sub-compensation area, a sub-brightness attenuation function of the display brightness of each sub-pixel in each first sub-compensation area in a direction from the planar display area to the curved display area;

[0082] The brightness attenuation function is determined according to the sub-brightness attenuation functions corresponding to the first sub-compensation areas.

[0083] in, Figure 4 is a schematic diagram of another display panel provided by an embodiment of the present invention, referring to Figure 4 Along the extension direction S of the second boundary 122, the area to be compensated 20 includes a plurality of first sub-compensation areas 201, each of which may include a plurality of sub-pixel rows. Exemplarily, each of the first sub-compensation areas 201 may include 200 sub-pixel rows, wherein the direction of the sub-pixel rows is perpendicular to the extension direction S of the second boundary 122.

[0084] Specifically, the display data of the sub-pixels of the preset luminous color in each pixel column in the first sub-compensation area 201 can be averaged to obtain the display data average of the sub-pixels of the preset luminous color in each pixel column, and the sub-brightness attenuation function can be obtained according to the display data average of each pixel column. The extension direction of the pixel column is the same as the extension direction S of the second boundary 122. Determining the brightness attenuation function according to the sub-brightness attenuation functions corresponding to the plurality of first sub-compensation areas can be determining the brightness attenuation function by fitting the plurality of sub-brightness attenuation functions.

[0085] By partitioning the area to be compensated 20 and determining the sub-brightness attenuation function of each first sub-compensation area 201 respectively, the sub-brightness attenuation function can better reflect the brightness attenuation trend of the corresponding first sub-compensation area 201. Therefore, the brightness attenuation function determined by multiple sub-brightness attenuations is more in line with the brightness attenuation trend of the area to be compensated 20, so that the compensation value obtained by correcting the compensation value or the compensation target value through the compensation control function determined by the brightness attenuation function is more in line with the brightness of the area to be compensated and more in line with the shape change of the area to be compensated.

[0086] Optionally, the area to be compensated further includes a first boundary away from the flat display area; and determining, according to the display data of each first sub-compensation area, a sub-brightness attenuation function of the display brightness of each sub-pixel in each first sub-compensation area along a direction from the flat display area to the curved display area includes:

[0087] Determining a sub-brightness attenuation function of each first sub-compensation area according to an average value of display data of a plurality of sub-pixels located on the first boundary in each first sub-compensation area and an average value of display data of a plurality of sub-pixels located on the second boundary; wherein the sub-brightness attenuation functions of the plurality of first sub-compensation areas are of the same type;

[0088] Determining the brightness attenuation function according to the sub-brightness attenuation functions corresponding to the first sub-compensation areas includes:

[0089] The coefficient value of the brightness attenuation function is determined by taking an average of the coefficient values ​​of the sub-brightness attenuation functions respectively corresponding to the plurality of the first sub-compensation areas.

[0090] Specifically, refer to Figure 4 , the area to be compensated 20 also includes a first boundary 121 away from the flat display area 11. A sub-brightness attenuation function of the same type can be preset for each first sub-compensation area 201, and the brightness average of the sub-pixels of the preset color located on the second boundary 122 and the brightness average of the sub-pixels of the preset color located on the first boundary 121 in each first sub-compensation area 201 are sequentially obtained along the extension direction S of the second boundary 122, and the coefficient value of the sub-brightness attenuation function is determined according to the two brightness averages, and then the coefficient value of the brightness attenuation function is determined by taking the average of the coefficient values ​​of multiple first sub-compensation areas 201.

[0091] Exemplarily, the sub-brightness attenuation function may be L=120-b*exp(c*x). Along the extension direction S of the second boundary 122, the brightness mean of the preset color sub-pixel on the second boundary 122 and the brightness mean of the preset color sub-pixel on the first boundary 121 in the first first sub-compensation area are first calculated. The attenuation coefficients c1 and b1 can be calculated through these two brightness mean values. Then, the attenuation coefficients c2 and b2 are calculated through the second first sub-compensation area. And so on, until the attenuation coefficients cn and bn are calculated through the last first sub-compensation area. Finally, c=(c1+c2+...+cn) / n, b+(b1+b2+...+bn) / n are calculated, where n is the number of first sub-compensation areas 201.

[0092] This embodiment determines the sub-brightness attenuation function of each first sub-compensation area according to the average value of the display data of multiple sub-pixels located on the first boundary in each first sub-compensation area and the average value of the display data of multiple sub-pixels located on the second boundary, and takes the average of the coefficient values ​​of the sub-brightness attenuation functions corresponding to the multiple first sub-compensation areas to determine the coefficient value of the brightness attenuation function. The calculation process is simpler, the amount of calculation is reduced, and the compensation speed is improved.

[0093] Optionally, before determining the compensation target value of the area to be compensated in the curved display area, the method further includes:

[0094] Determine a position along a direction from the flat display area to the curved display area where a brightness change rate of the curved display area is greater than a preset value as a first boundary of the area to be compensated;

[0095] An area between a second boundary of the curved display area adjacent to the flat display area and the first boundary is determined as the area to be compensated.

[0096] Specifically, the brightness change rate may be an inclination angle or slope of a tangent of a brightness change curve of the curved display area in a direction from the flat display area to the curved display area. Exemplarily, the display data of each sub-pixel of the same color of each pixel column parallel to the second boundary may be averaged to obtain an average brightness, a brightness change curve may be drawn according to the average brightness of each pixel column, and the inclination angle of the tangent at each position of the brightness change curve may be obtained. The preset value may be 45 degrees or 50 degrees, etc., and this embodiment does not specifically limit this.

[0097] Figure 5 is a schematic diagram of another display panel provided by an embodiment of the present invention, referring to Figure 5 The position where the brightness change rate of the curved display area is greater than the preset value is the part where the 3D shape of the curved display area physically changes dramatically. Since this part has a larger curvature than the flat display area, the brightness data of the area from the first boundary 121 to the third boundary 123 of the curved display area 12 away from the flat display area 11 is distorted after actual photography. This part of the data cannot be effectively compensated, and this area has little effect on the display effect of the entire display panel. In this embodiment, the area between the second boundary 122 and the first boundary 121 is used as the area to be compensated for the curved display area 12, which can more accurately and effectively compensate the curved display area 12 and reduce the difficulty of compensation.

[0098] Optionally, the compensation value of the area of ​​the curved display area other than the area to be compensated may be determined to be zero. Figure 5 That is, the compensation value of the area between the first boundary 121 and the third boundary 123 can be determined to be zero. Since users usually pay more attention to the flat display area 11 of the display panel and the curved display area 12 near the flat display area 11 when using the display panel, non-compensation of this area will not have a great impact on the display during actual compensation. By directly determining the compensation value of this area to be zero, the compensation workload is reduced and the compensation speed is improved.

[0099] It should be noted that, when actually performing compensation, the display data of the area between the first boundary 121 and the third boundary 123 can be directly replaced with the display data of the first boundary 121, so that the display data of each pixel column in the area between the first boundary 121 and the third boundary 123 are equal. During the compensation process, the algorithm recognizes that the display data of each pixel column in the area between the first boundary 121 and the third boundary 123 are equal, and the area will not be compensated directly. The above is only an example of a compensation algorithm, and is not a limitation of the present invention. In other embodiments, the display data between the first boundary 121 and the third boundary 123 can be set according to the compensation rule of the algorithm.

[0100] Optionally, determining the compensation target value of the area to be compensated includes:

[0101] Acquiring second display data of the planar display area at the preset position when the display panel displays a preset gray scale;

[0102] Determining a partial area of ​​the planar display area adjacent to the area to be compensated as a compensation reference area;

[0103] The compensation target value of the area to be compensated is determined according to the display data of the compensation reference area.

[0104] The second display data and the first display data are display brightness data when both the flat display area 11 and the curved display area 12 display a picture of the same color with the same preset grayscale, or they may be display grayscale data when both the flat display area 11 and the curved display area 12 display a picture of the same color with the same preset grayscale. Exemplarily, the second display data may include brightness data of a monochrome picture corresponding to grayscales such as 16, 32, 64, 128 or 192 displayed in the flat display area, and the first display data may be brightness data of a monochrome picture corresponding to grayscales such as 16, 32, 64, 128 or 192 displayed in the curved display area, and the monochrome picture may be a red picture, a green picture or a blue picture, etc. The second display data and the first display data may be obtained simultaneously through an optical device, or they may be obtained separately, and this embodiment does not specifically limit this.

[0105] Specifically, refer to Figure 5 The compensation reference area 13 may be an area with a set width adjacent to the plane display area 11 and the curved display area 12. The set width is the size of the compensation reference area 13 in the direction from the plane display area to the curved display area. The set width may be set as required. For example, the compensation reference area 13 may include at least two pixel columns. The compensation target value may be the average value of the display data of all sub-pixels of the same color as the sub-pixel to be compensated in the compensation reference area 13, or the average value of the display data of sub-pixels of the same color as the sub-pixel to be compensated in a part of the compensation reference area 13. This embodiment does not specifically limit this.

[0106] In this embodiment, the compensation target value of the area to be compensated is determined according to the display data of the flat display area near the area to be compensated, so that the brightness transition between the area to be compensated and the flat display area after compensation is more natural, resulting in a better display effect of the display panel.

[0107] The following describes several methods for determining the compensation target value of the area to be compensated based on the display data of the compensation reference area:

[0108] Optionally, determining the compensation target value of the area to be compensated according to the display data of the compensation reference area includes:

[0109] The average value of the display data of the sub-pixels of the same color as the sub-pixel to be compensated in the compensation reference area is determined as the compensation target value. This arrangement reduces the difficulty of determining the compensation target value and improves the compensation speed.

[0110] Optionally, determining the compensation target value of the area to be compensated according to the display data of the compensation reference area includes:

[0111] Dividing the area to be compensated into a plurality of second compensation sub-areas along an extending direction of a second boundary of the curved display area adjacent to the flat display area;

[0112] Dividing the compensation reference area into a plurality of sub-reference areas along an extension direction of a second boundary of the curved display area adjacent to the flat display area; wherein each sub-reference area corresponds to one second sub-compensation area;

[0113] The compensation target value of the second compensation sub-area corresponding to each sub-reference area is determined according to the display data of the sub-reference area.

[0114] Specifically, Figure 6 is a schematic diagram of another display panel provided by an embodiment of the present invention, referring to Figure 6 The compensation reference area 13 includes a plurality of sub-reference areas 101, and the area to be compensated includes a plurality of second sub-compensation areas 102. Each sub-reference area 101 is adjacent to its corresponding second sub-compensation area 102. The compensation target value of the second sub-compensation area 102 is determined according to the display data of the corresponding sub-reference area 101. After compensation, the brightness transition between the second sub-compensation area 102 and the corresponding sub-reference area 101 is more uniform, so that the brightness transition between the area to be compensated and the flat display area is more uniform.

[0115] It should be noted that the average value of the display data of the sub-pixels of the same color as the sub-pixel to be compensated in the sub-reference area can be directly determined as the target compensation value of the corresponding second sub-compensation area, or the display data of the sub-pixels at the center of the sub-reference area can be determined as the compensation target value of the corresponding second sub-compensation area. In addition, the second sub-compensation area and the first sub-compensation area can be the same area or different areas.

[0116] Optionally, determining the compensation target value of the second sub-compensation area corresponding to each sub-reference area according to the display data thereof includes:

[0117] The compensation target value of the corresponding second sub-compensation area is determined according to the average value of the display data of the sub-pixels of the same color as the sub-pixel to be compensated in each sub-reference area.

[0118] Specifically, the display average value of the sub-pixels of the same color as the sub-pixel to be compensated in the sub-reference area is used as the compensation target value. The algorithm is simple and makes the display transition between the compensated sub-compensation area and the corresponding sub-reference area more uniform.

[0119] This embodiment also provides a compensation device for a display panel. Figure 7 is a schematic diagram of a compensation device for a display panel provided by an embodiment of the present invention, with reference to Figure 7 , the compensation device 300 comprises:

[0120] A display data acquisition module 210, configured to acquire, at a preset position, first display data of the curved display area when the display panel displays a preset gray scale;

[0121] A compensation target value determination module 220, used to determine a compensation target value of the area to be compensated in the curved display area;

[0122] The compensation value determination module 230 is used to determine the compensation value of the sub-pixel to be compensated in the area to be compensated when displaying a preset gray scale according to the first display data of the area to be compensated, the compensation target value and the compensation control function, so that when the area to be compensated is observed at the preset position after compensation, the display brightness of the area to be compensated gradually decreases in the direction away from the planar display area.

[0123] Optionally, the compensation value determination module 230 includes:

[0124] a brightness attenuation function determining unit, configured to determine a brightness attenuation function of the display brightness of each sub-pixel in the area to be compensated along a direction from the planar display area to the curved display area according to first display data of each sub-pixel in the area to be compensated;

[0125] a compensation control function determining unit, configured to determine the compensation control function according to the brightness attenuation function, wherein the compensation control function is less than 1;

[0126] The compensation value determination unit is used to calculate the difference between the compensation target value corresponding to the sub-pixel to be compensated and the corresponding first display data, and determine the product of the difference and the compensation control function as the compensation value of the sub-pixel to be compensated.

[0127] Optionally, the brightness attenuation function determining unit includes:

[0128] A first sub-unit, used for dividing the area to be compensated into a plurality of first sub-compensation areas along an extending direction of a second boundary of the area to be compensated adjacent to the planar display area;

[0129] A second subunit is used to determine a sub-brightness attenuation function of the display brightness of each sub-pixel in each first sub-compensation area along a direction from the planar display area to the curved display area according to the display data of each first sub-compensation area;

[0130] The third subunit is configured to determine the brightness attenuation function according to the sub-brightness attenuation functions corresponding to the first sub-compensation areas.

[0131] Optionally, the compensation control function determination unit is specifically used for:

[0132] The coefficient value of the compensation control function is determined according to the coefficient value of the brightness attenuation function, wherein the compensation control function and the brightness attenuation function are of the same function type.

[0133] Optionally, the area to be compensated further includes a first boundary away from the planar display area; and the second subunit is specifically used for:

[0134] Determining a sub-brightness attenuation function of each first sub-compensation area according to an average value of display data of a plurality of sub-pixels located on the first boundary in each first sub-compensation area and an average value of display data of a plurality of sub-pixels located on the second boundary; wherein the sub-brightness attenuation functions of the plurality of first sub-compensation areas are of the same type;

[0135] The third subunit is specifically used to determine the coefficient value of the brightness attenuation function by taking the average of the coefficient values ​​of the sub-brightness attenuation functions respectively corresponding to the plurality of the first sub-compensation areas.

[0136] Optionally, the compensation device further comprises:

[0137] A first boundary determination module is used for determining, before determining the compensation target value of the area to be compensated in the curved display area, a position where the brightness change rate of the curved display area is greater than a preset value along the direction from the flat display area to the curved display area as a first boundary of the area to be compensated;

[0138] The module for determining an area to be compensated is used to determine an area between a second boundary of the curved display area adjacent to the flat display area and the first boundary as the area to be compensated.

[0139] Optionally, the compensation target value determination module 220 includes:

[0140] A second display data acquisition unit, configured to acquire, at the preset position, second display data of the planar display area when the display panel displays a preset gray scale;

[0141] A compensation reference area determination unit, configured to determine a partial area of ​​the flat display area adjacent to the area to be compensated as a compensation reference area;

[0142] The compensation target value determining unit is used to determine the compensation target value of the area to be compensated according to the display data of the compensation reference area.

[0143] Optionally, the compensation target value determination unit is specifically used for:

[0144] The average value of the display data of the sub-pixels of the same color as the sub-pixel to be compensated in the compensation reference area is determined as the compensation target value.

[0145] Optionally, the compensation target value determining unit includes:

[0146] A second sub-compensation area determining sub-unit, configured to divide the area to be compensated into a plurality of second sub-compensation areas along an extending direction of a second boundary of the curved display area adjacent to the flat display area;

[0147] a sub-reference area determining sub-unit, configured to divide the compensation reference area into a plurality of sub-reference areas along an extending direction of a second boundary of the curved display area adjacent to the flat display area; wherein each sub-reference area corresponds to one second sub-compensation area;

[0148] The compensation target value determining subunit is used to determine the compensation target value of the corresponding second sub-compensation area according to the display data of each sub-reference area.

[0149] Optionally, the compensation target value determining subunit is specifically configured to determine the compensation target value of the corresponding second sub-compensation area according to an average value of display data of sub-pixels of the same color as the sub-pixel to be compensated in each sub-reference area.

[0150] Optionally, the device further comprises:

[0151] The boundary area compensation value determination module is used to determine the compensation value of the area of ​​the curved display area other than the area to be compensated to be zero.

[0152] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A compensation method for a display panel, characterized in that: The display panel includes a flat display area and a curved display area located at least on one side of the flat display area, and the compensation method includes: Acquiring first display data of the curved display area at a preset position when the display panel displays a preset gray scale; Determining a compensation target value of the area to be compensated in the curved display area; Determine, according to the first display data of the area to be compensated, the compensation target value and the compensation control function, a compensation value when the sub-pixel to be compensated in the area to be compensated displays a preset gray scale, so that after compensation, when the area to be compensated is observed at the preset position, the display brightness of the area to be compensated gradually decreases in a direction away from the planar display area; Determining the compensation value of the sub-pixel to be compensated in the area to be compensated when displaying a preset gray scale according to the first display data of the area to be compensated, the compensation target value and the compensation control function comprises: Determine, according to the first display data of each sub-pixel in the area to be compensated, a brightness attenuation function of the display brightness of each sub-pixel in the area to be compensated along the direction from the planar display area to the curved display area; Determine the compensation control function according to the brightness attenuation function, wherein the compensation control function is less than 1; Calculating a difference between the compensation target value corresponding to the sub-pixel to be compensated and the corresponding first display data, and determining a product of the difference and the compensation control function as a compensation value of the sub-pixel to be compensated; Determining a brightness attenuation function of the display brightness of each sub-pixel in the area to be compensated along a direction from the planar display area to the curved display area according to first display data of each sub-pixel in the area to be compensated, comprising: Dividing the area to be compensated into a plurality of first compensation sub-areas along an extending direction of a second boundary of the area to be compensated adjacent to the planar display area; Determine, according to the display data of each first sub-compensation area, a sub-brightness attenuation function of the display brightness of each sub-pixel in each first sub-compensation area in a direction from the planar display area to the curved display area; Determining the brightness attenuation function according to a plurality of sub-brightness attenuation functions corresponding to the first sub-compensation areas; Determining the compensation control function according to the brightness attenuation function includes: The coefficient value of the compensation control function is determined according to the coefficient value of the brightness attenuation function, wherein the compensation control function and the brightness attenuation function are of the same function type.

2. The compensation method according to claim 1, characterized in that: The area to be compensated also includes a first boundary away from the flat display area; and determining, according to the display data of each first sub-compensation area, a sub-brightness attenuation function of the display brightness of each sub-pixel in each first sub-compensation area in a direction from the flat display area to the curved display area includes: Determining a sub-brightness attenuation function of each first sub-compensation area according to an average value of display data of a plurality of sub-pixels located on the first boundary in each first sub-compensation area and an average value of display data of a plurality of sub-pixels located on the second boundary; wherein the sub-brightness attenuation functions of the plurality of first sub-compensation areas are of the same type; Determining the brightness attenuation function according to the sub-brightness attenuation functions corresponding to the first sub-compensation areas includes: The coefficient value of the brightness attenuation function is determined by taking an average of the coefficient values ​​of the sub-brightness attenuation functions respectively corresponding to the plurality of the first sub-compensation areas.

3. The compensation method according to claim 1, characterized in that: Before determining the compensation target value of the area to be compensated in the curved display area, the method further includes: Determine a position along a direction from the flat display area to the curved display area where a brightness change rate of the curved display area is greater than a preset value as a first boundary of the area to be compensated; An area between a second boundary of the curved display area adjacent to the flat display area and the first boundary is determined as the area to be compensated.

4. The compensation method according to claim 1, characterized in that: Determining the compensation target value of the area to be compensated includes: Acquiring second display data of the planar display area at the preset position when the display panel displays a preset gray scale; Determining a partial area of ​​the planar display area adjacent to the area to be compensated as a compensation reference area; The compensation target value of the area to be compensated is determined according to the display data of the compensation reference area.

5. The compensation method according to claim 4, characterized in that: Determining the compensation target value of the area to be compensated according to the display data of the compensation reference area includes: determining the average value of the display data of the sub-pixels of the same color as the sub-pixel to be compensated in the compensation reference area as the compensation target value; or, Dividing the area to be compensated into a plurality of second compensation sub-areas along an extending direction of a second boundary of the curved display area adjacent to the flat display area; Dividing the compensation reference area into a plurality of sub-reference areas along an extension direction of a second boundary of the curved display area adjacent to the flat display area; wherein each sub-reference area corresponds to one second sub-compensation area; The compensation target value of the second compensation sub-area corresponding to each sub-reference area is determined according to the display data of the sub-reference area.

6. The compensation method according to claim 5, characterized in that: Determining the compensation target value of the second sub-compensation area corresponding to each sub-reference area according to the display data of the sub-reference area includes: The compensation target value of the corresponding second sub-compensation area is determined according to the average value of the display data of the sub-pixels of the same color as the sub-pixel to be compensated in each sub-reference area.

7. The compensation method according to claim 1, characterized in that: Also includes: The compensation value of the area of ​​the curved display area except the area to be compensated is determined to be zero.

8. A compensation device for a display panel, characterized in that: The compensation device comprises: A display data acquisition module, used for acquiring first display data when the curved display area of ​​the display panel displays a preset gray scale at a preset position; A compensation target value determination module, used to determine a compensation target value of the area to be compensated in the curved display area; a compensation value determination module, configured to determine, according to the first display data of the area to be compensated, the compensation target value and the compensation control function, a compensation value when the sub-pixel to be compensated in the area to be compensated displays a preset grayscale, so that after compensation, when the area to be compensated is observed at the preset position, the display brightness of the area to be compensated gradually decreases in a direction away from the planar display area; Determining the compensation value of the sub-pixel to be compensated in the area to be compensated when displaying a preset gray scale according to the first display data of the area to be compensated, the compensation target value and the compensation control function comprises: Determine, according to the first display data of each sub-pixel in the area to be compensated, a brightness attenuation function of the display brightness of each sub-pixel in the area to be compensated along the direction from the planar display area to the curved display area; Determine the compensation control function according to the brightness attenuation function, wherein the compensation control function is less than 1; Calculating a difference between the compensation target value corresponding to the sub-pixel to be compensated and the corresponding first display data, and determining a product of the difference and the compensation control function as a compensation value of the sub-pixel to be compensated; Determining a brightness attenuation function of the display brightness of each sub-pixel in the area to be compensated along a direction from the planar display area to the curved display area according to first display data of each sub-pixel in the area to be compensated, comprising: Dividing the area to be compensated into a plurality of first compensation sub-areas along an extending direction of a second boundary of the area to be compensated adjacent to the planar display area; Determine, according to the display data of each first sub-compensation area, a sub-brightness attenuation function of the display brightness of each sub-pixel in each first sub-compensation area in a direction from the planar display area to the curved display area; Determining the brightness attenuation function according to a plurality of sub-brightness attenuation functions corresponding to the first sub-compensation areas; Determining the compensation control function according to the brightness attenuation function includes: The coefficient value of the compensation control function is determined according to the coefficient value of the brightness attenuation function, wherein the compensation control function and the brightness attenuation function are of the same function type.

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