Pixel compensation method, device and display device

Abstract

The present invention provides a pixel compensation method, device and display device, belonging to the field of display technology. The pixel compensation method includes: obtaining at least two sets of test data, each set of test data includes a test grayscale of a test pixel and a corresponding compensation grayscale, and the test pixel can reach a target brightness when the compensation grayscale is input; using at least two sets of test data to obtain a first compensation formula, the first compensation formula is a relationship between the test grayscale of the pixel and the initial compensation grayscale; using the first compensation formula and an angle correction coefficient to obtain a second compensation formula, the second compensation formula is a relationship between the test grayscale of the pixel of the curved display panel and the actual compensation grayscale, the curved display panel is divided into multiple display areas along a first direction, and the angle correction coefficients of different display areas are different; inputting the target grayscale into the second compensation formula, and calculating the corresponding actual compensation grayscale. The technical solution of the present invention can improve the problem of uneven brightness of the display device.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a pixel compensation method, device and display equipment. Background Art

[0002] Due to fluctuations in the manufacturing process and other reasons, the properties of different pixels (or sub-pixels) of the display panel are not exactly the same. Therefore, at the same grayscale (same data voltage), the actual display brightness of different pixels is different, causing uneven brightness (mura).

[0003] Existing demura compensation technology usually takes the average brightness of the entire display panel or a part of the area as the brightness reference value for demura compensation. Each pixel on the display panel takes this brightness reference value as the target, and adjusts the actual grayscale of each pixel according to the "grayscale-brightness" function relationship of each pixel to achieve the purpose of consistent brightness of the entire display panel. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a pixel compensation method, device and display device, which can improve the brightness unevenness problem of the display device.

[0005] To solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0006] In one aspect, a pixel compensation method is provided, comprising:

[0007] Acquire at least two groups of test data, each group of the test data includes a test grayscale of a test pixel and a corresponding compensation grayscale, and the test pixel can achieve a target brightness when the compensation grayscale is input;

[0008] Obtaining a first compensation formula using the at least two sets of test data, wherein the first compensation formula is a relationship between a test grayscale of a pixel and an initial compensation grayscale;

[0009] A second compensation formula is obtained by using the first compensation formula and the angle correction coefficient, wherein the second compensation formula is a relationship between a test grayscale of a pixel of the curved display panel and an actual compensation grayscale, the curved display panel is divided into a plurality of display areas along a first direction, different display areas have different angle correction coefficients, and the first direction is perpendicular to a bending direction of the curved display panel;

[0010] The target grayscale is input into the second compensation formula to calculate the corresponding actual compensation grayscale.

[0011] In some embodiments, obtaining a set of test data includes:

[0012] Inputting a test grayscale to the test pixel;

[0013] Taking a photo of the curved display panel, and obtaining the actual brightness of the test pixel according to the photographed image;

[0014] The compensated grayscale of the test pixel is calculated according to the actual brightness and the target brightness, and the target brightness is the average brightness of the pixels in the central area of ​​the curved display panel when the test grayscale is input.

[0015] In some embodiments, the test pixel is a green pixel, a blue pixel or a red pixel.

[0016] In some embodiments, the first compensation formula determined using at least two sets of test data is:

[0017] y1=x*Gain+Offset;

[0018] Among them, Gain and Offset are compensation coefficients, x is the test grayscale, and y1 is the compensation grayscale.

[0019] In some embodiments, the first compensation formula determined using at least three sets of test data is:

[0020] y1=x*Gain1 2 +x*Gain2+Offset,

[0021] Among them, Offset, Gain1, Gain2 are compensation coefficients, x is the test grayscale, and y1 is the compensation grayscale.

[0022] In some embodiments, the second compensation formula is:

[0023] y=y1*K, K=(1 / Lθ%)^(-1 / γ);

[0024] Among them, y is the actual compensation grayscale, K is the angle correction coefficient, θ is the screen viewing angle, that is, the angle between the normal of the central area of ​​the curved display panel and the normal of the pixel area, Lθ% is the brightness attenuation ratio when the screen viewing angle is θ, and γ is the gamma value.

[0025] An embodiment of the present invention further provides a pixel compensation device, comprising:

[0026] An acquisition module, used for acquiring at least two groups of test data, each group of the test data includes a test grayscale of a test pixel and a corresponding compensation grayscale, and the test pixel can reach a target brightness when the compensation grayscale is input;

[0027] A first compensation module, configured to obtain a first compensation formula using the at least two sets of test data, wherein the first compensation formula is a relationship between a test grayscale of a pixel and an initial compensation grayscale;

[0028] a second compensation module, configured to obtain a second compensation formula by using the first compensation formula and the angle correction coefficient, wherein the second compensation formula is a relationship between a test grayscale of a pixel of the curved display panel and an actual compensation grayscale, the curved display panel being divided into a plurality of display areas along a first direction, different display areas having different angle correction coefficients, and the first direction being perpendicular to a bending direction of the curved display panel;

[0029] The processing module is used to input the target grayscale into the second compensation formula to calculate the corresponding actual compensation grayscale.

[0030] In some embodiments, the acquisition module includes:

[0031] An input unit, used for inputting a test grayscale to the test pixel;

[0032] A shooting unit, used to take a picture of the curved display panel and obtain the actual brightness of the test pixel according to the photographed image;

[0033] A calculation unit is used to calculate the compensated grayscale of the test pixel according to the actual brightness and the target brightness, and the target brightness is the average brightness of the pixels in the central area of ​​the curved display panel when the test grayscale is input.

[0034] In some embodiments, the first compensation formula determined using at least two sets of test data is:

[0035] y1=x*Gain+Offset;

[0036] Among them, Gain and Offset are compensation coefficients, x is the test grayscale, and y1 is the compensation grayscale.

[0037] In some embodiments, the first compensation formula determined using at least three sets of test data is:

[0038] y1=x*Gain1 2 +x*Gain2+Offset,

[0039] Among them, Offset, Gain1, Gain2 are compensation coefficients, x is the test grayscale, and y1 is the compensation grayscale.

[0040] In some embodiments, the second compensation formula is:

[0041] y=y1*K, K=(1 / Lθ%)^(-1 / γ);

[0042] Among them, y is the actual compensation grayscale, K is the angle correction coefficient, θ is the screen viewing angle, that is, the angle between the normal of the central area of ​​the curved display panel and the normal of the pixel area, Lθ% is the brightness attenuation ratio when the screen viewing angle is θ, and γ is the gamma value.

[0043] An embodiment of the present invention further provides a display device, comprising the pixel compensation device as described above.

[0044] The embodiments of the present invention have the following beneficial effects:

[0045] In the above scheme, on the basis of the first compensation formula, the first compensation formula is adjusted using the angle correction coefficient to obtain the second compensation formula, and the second compensation formula is used to determine the actual compensation grayscale. In this way, when the brightness compensation of the curved display panel is performed, the obtained compensation grayscale is corrected by the angle, which can improve the brightness unevenness problem of the curved display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a schematic diagram of a curved display panel;

[0047] Figure 2 Schematic diagram of the process of the pixel compensation method according to an embodiment of the present invention;

[0048] Figure 3 is a schematic diagram of the screen viewing angle of a curved display panel;

[0049] Figure 4 A schematic diagram of test pixels selected according to an embodiment of the present invention;

[0050] Figure 5 A schematic diagram showing the relationship between screen viewing angle and brightness at different positions of a curved display panel;

[0051] Figure 6 Schematic diagram of the structure of a pixel compensation device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0053] In the related art, when a Demura camera takes mura photos of a curved screen, Figure 1 As shown in the figure, the brightness data collected at the bend is actually the viewing angle brightness data of the sampling point, which leads to the distortion of mura collection. During the post-processing compensation, compensation abnormality will occur, resulting in uneven brightness of the curved screen.

[0054] Embodiments of the present invention provide a pixel compensation method, device and display device, which can improve the brightness unevenness problem of the display device.

[0055] An embodiment of the present invention provides a pixel compensation method, such as Figure 2 As shown, including:

[0056] Step 101: Acquire at least two groups of test data, each group of the test data includes a test grayscale of a test pixel and a corresponding compensation grayscale, and the test pixel can reach a target brightness when the compensation grayscale is input;

[0057] Step 102: obtaining a first compensation formula using the at least two sets of test data, wherein the first compensation formula is a relationship between a test grayscale of a pixel and an initial compensation grayscale;

[0058] Step 103: obtaining a second compensation formula using the first compensation formula and the angle correction coefficient, wherein the second compensation formula is a relationship between a test grayscale of a pixel of the curved display panel and an actual compensation grayscale, the curved display panel being divided into a plurality of display areas along a first direction, different display areas having different angle correction coefficients, and the first direction being perpendicular to a bending direction of the curved display panel;

[0059] Step 104: input the target grayscale into the second compensation formula to calculate the corresponding actual compensation grayscale.

[0060] In this embodiment, based on the first compensation formula, the first compensation formula is adjusted using the angle correction coefficient to obtain a second compensation formula, and the second compensation formula is used to determine the actual compensation grayscale. In this way, when the brightness compensation of the curved display panel is performed, the obtained compensation grayscale is corrected by the angle, which can improve the brightness unevenness problem of the curved display panel.

[0061] In some embodiments, obtaining a set of test data includes:

[0062] Inputting a test grayscale to the test pixel, the test pixel may be selected at different positions of the curved display panel, for example, the curved display panel is divided into a plurality of display areas along a first direction, a plurality of test pixels may be selected in different display areas, or a plurality of test pixels may be selected in the same display area;

[0063] Taking a photo of the curved display panel, and obtaining the actual brightness of the test pixel according to the photographed image. Specifically, the curved display panel may be photographed using a CCD (charge coupled device);

[0064] The compensated grayscale of the test pixel is calculated according to the actual brightness and the target brightness, and the target brightness is the average brightness of the pixels in the central area of ​​the curved display panel when the test grayscale is input.

[0065] In some embodiments, the test pixel is a green pixel, a blue pixel or a red pixel. For pixels of different colors, the corresponding first compensation formula and second compensation formula are obtained respectively.

[0066] In a specific embodiment, taking the test pixel as a red pixel as an example, a test pixel is selected, two different test grayscales are input to the test pixel respectively, and a CCD camera is used to photograph the curved display panel, and the actual brightness of the test pixel at each test grayscale is obtained based on the photographed image; wherein the CCD camera takes pictures perpendicular to the center point plane of the curved display panel.

[0067] The target brightness of the test pixel at each test grayscale is obtained. The target brightness is the average brightness of the central display area of ​​the curved display panel. When obtaining the target brightness, all pixels in the central display area of ​​the curved display panel are input into the test grayscale, or all pixels of the same color as the test pixel in the central display area of ​​the curved display panel are input into the test grayscale. The compensation grayscale of the test pixel at each test grayscale is obtained through the target brightness and the actual brightness. The compensation grayscale can make the actual brightness of the pixel equal to the target brightness of the corresponding test grayscale.

[0068] In some embodiments, the first compensation formula determined using two sets of test data is:

[0069] y1=x*Gain+Offset;

[0070] Among them, Gain and Offset are compensation coefficients, x is the test grayscale, and y1 is the compensation grayscale.

[0071] Of course, more than three groups of test data may be obtained, and the first compensation formula may be determined using the three groups of test data. The specific form of the first compensation formula is not limited to the above, and may also be in other forms, such as including more compensation coefficients.

[0072] In some embodiments, at least three sets of test data may be used to determine the first compensation formula as follows:

[0073] y1=x*Gain12+x*Gain2+Offset,

[0074] Wherein, Offset, Gain1, Gain2 are compensation coefficients, x is the test grayscale, and y1 is the compensation grayscale. The specific form of the first compensation formula is not limited to the above, and may also be in other forms, such as including more compensation coefficients.

[0075] The second compensation formula obtained by using the first compensation formula and the angle correction coefficient is:

[0076] y=y1*K, K=(1 / Lθ%)^(-1 / γ);

[0077] Wherein, y is the actual compensation grayscale, K is the angle correction coefficient, θ is the screen viewing angle, that is, the angle between the normal line of the central area of ​​the curved display panel and the normal line of the area where the pixel is located, Lθ% is the brightness attenuation ratio when the screen viewing angle is θ, and γ is the gamma value. In this embodiment, the first compensation formula is adjusted by using the angle correction coefficient to obtain the second compensation formula, so that when the curved display panel is subjected to brightness compensation, the obtained compensation grayscale is corrected by the angle, which can improve the brightness unevenness problem of the curved display panel.

[0078] According to the gamma formula (gray1 / gray2)^γ=L1 / L2, then (y / y1)^γ=(L0° / Lθ)%, and the formula can be derived to obtain K=(1 / Lθ%)^(-1 / γ). Figure 3 As shown, there are different screen viewing angles at different positions of the curved display panel. For the central pixel of the curved display panel, the screen viewing angle is 0°. For pixels at other positions of the curved display panel, the screen viewing angle is the angle between the normal of the central area of ​​the curved display panel and the normal of the area where the pixel is located.

[0079] The curved display panel can be longitudinally divided into a plurality of display areas along the first direction, and the K value of each display area is determined according to the screen viewing angle optical characteristics and the curved surface structure, and then the corresponding second compensation formula is determined, so that each display area corresponds to a different second compensation formula, and the brightness compensation of the curved display panel can be accurately performed. The K value of each display area can be pre-stored in a register and read when needed.

[0080] The above embodiment takes the test pixel as a red pixel as an example to illustrate the pixel compensation method of the present invention. The above embodiment can be used to obtain the second compensation formula for the red pixel; in addition, a green test pixel and a blue test pixel can also be selected to obtain the second compensation formula for the blue pixel and the second compensation formula for the green pixel in the same way. In addition, in this embodiment, one test pixel can be selected or multiple test pixels can be selected.

[0081] In a specific example, taking the resolution of the curved display panel as 1920*720 as an example, Figure 4As shown, a group of test pixels is selected from the center column and the edge column of the curved display panel, and each group of test pixels includes a red pixel (R), a green pixel (G), and a blue pixel (B). The first test grayscale - grayscale 1 is input to the curved display panel, and the CCD camera of the curved display panel is taken to obtain the brightness data of all pixels under grayscale 1: for the test pixels in the edge column, the actual brightness of the red pixel is 2.48, the actual brightness of the green pixel is 8.19, and the actual brightness of the blue pixel is 1.09; for the test pixels in the center column, the actual brightness of the red pixel is 2.87, the actual brightness of the green pixel is 8.46, and the actual brightness of the blue pixel is 1.31. The second test grayscale - Grayscale 2 is input to the curved display panel, and the CCD camera of the curved display panel is taken to obtain the brightness data of all pixels under Grayscale 2: for the test pixels in the edgemost column, the actual brightness of the red pixel is 156, the actual brightness of the green pixel is 665, and the actual brightness of the blue pixel is 50.1; for the test pixels in the center column, the actual brightness of the red pixel is 180, the actual brightness of the green pixel is 682, and the actual brightness of the blue pixel is 58.6.

[0082] Taking the center brightness of the curved display panel as the target brightness, the gain and offset values ​​can be calculated according to the formula y1=x*Gain+Offset and the gamma formula. For red pixels, the gain and offset values ​​are 1.07 and 0.02 respectively; for green pixels, the gain and offset values ​​are 1.01 and 0.16 respectively; for blue pixels, the gain and offset values ​​are 1.07 and 0.48 respectively.

[0083] According to the first compensation formula, the initial compensation grayscale of the edgemost column of pixels can be calculated:

[0084] For red pixels, when the target grayscale is 31 grayscale, the initial compensation grayscale is 33 grayscale; when the target grayscale is 225 grayscale, the initial compensation grayscale is 240 grayscale;

[0085] For green pixels, when the target grayscale is 31 grayscale, the initial compensation grayscale is 32 grayscale; when the target grayscale is 225 grayscale, the initial compensation grayscale is 228 grayscale;

[0086] For a blue pixel, when the target grayscale is grayscale 31, the initial compensation grayscale is grayscale 34; when the target grayscale is grayscale 225, the initial compensation grayscale is grayscale 242.

[0087] According to the formula y=y1*K, K=(1 / Lθ%)^(-1 / γ), the actual compensation grayscale after angle correction can be calculated. Figure 5is a schematic diagram of the relationship between the screen viewing angle and brightness at different positions of the curved display panel. Table 1 is a schematic diagram of the relationship between the screen viewing angle and brightness at different positions of the curved display panel, wherein the brightness at the center position of the curved display panel is set to 1.

[0088] Table 1

[0089]

[0090] For the edgemost column of pixels, the value of θ is 20°. According to the brightness attenuation characteristics of the curved display panel, when θ is 20°, the brightness of R, G, and B decays to 92%, 89%, and 84% of the brightness at the center, respectively. The gamma of R, G, and B is 2.2. Calculated by the second compensation formula, the actual compensation grayscale of the edgemost column of pixels is:

[0091] For red pixels, when the target grayscale is 31 grayscale, the actual compensation grayscale is 32 grayscale; when the target grayscale is 225 grayscale, the actual compensation grayscale is 231 grayscale;

[0092] For green pixels, when the target grayscale is 31 grayscale, the actual compensation grayscale is 30 grayscale; when the target grayscale is 225 grayscale, the actual compensation grayscale is 216 grayscale;

[0093] For a blue pixel, when the target grayscale is grayscale 31, the actual compensation grayscale is grayscale 31; when the target grayscale is grayscale 225, the actual compensation grayscale is grayscale 224.

[0094] Through the technical solution of this embodiment, the brightness of the curved display panel can be accurately compensated to improve the problem of uneven brightness.

[0095] The embodiment of the present invention further provides a pixel compensation device, such as Figure 6 As shown, including:

[0096] An acquisition module 21 is used to acquire at least two groups of test data, each group of the test data includes a test grayscale of a test pixel and a corresponding compensation grayscale, and the test pixel can reach a target brightness when the compensation grayscale is input;

[0097] A first compensation module 22, configured to obtain a first compensation formula using the at least two sets of test data, wherein the first compensation formula is a relationship between a test grayscale of a pixel and an initial compensation grayscale;

[0098] A second compensation module 23, configured to obtain a second compensation formula by using the first compensation formula and the angle correction coefficient, wherein the second compensation formula is a relationship between a test grayscale of a pixel of the curved display panel and an actual compensation grayscale, the curved display panel being divided into a plurality of display areas along a first direction, different display areas having different angle correction coefficients, and the first direction being perpendicular to a bending direction of the curved display panel;

[0099] The processing module 24 is used to input the target grayscale into the second compensation formula to calculate the corresponding actual compensation grayscale.

[0100] In some embodiments, the acquisition module includes:

[0101] An input unit, used to input a test grayscale to the test pixel, and the test pixel can be selected at different positions of the curved display panel, for example, the curved display panel is divided into a plurality of display areas along a first direction, and a plurality of test pixels can be selected in different display areas, or a plurality of test pixels can be selected in the same display area;

[0102] A shooting unit, used to take a picture of the curved display panel, and obtain the actual brightness of the test pixel according to the photographed image. Specifically, the curved display panel can be photographed using a CCD (charge coupled device);

[0103] A calculation unit is used to calculate the compensated grayscale of the test pixel according to the actual brightness and the target brightness, and the target brightness is the average brightness of the pixels in the central area of ​​the curved display panel when the test grayscale is input.

[0104] In some embodiments, the test pixel is a green pixel, a blue pixel or a red pixel. For pixels of different colors, the corresponding first compensation formula and second compensation formula are obtained respectively.

[0105] In a specific embodiment, taking the test pixel as a red pixel as an example, a test pixel is selected, two different test grayscales are input to the test pixel respectively, and a CCD camera is used to photograph the curved display panel, and the actual brightness of the test pixel at each test grayscale is obtained based on the photographed image; wherein the CCD camera takes pictures perpendicular to the center point plane of the curved display panel.

[0106] The target brightness of the test pixel at each test grayscale is obtained. The target brightness is the average brightness of the central display area of ​​the curved display panel. When obtaining the target brightness, all pixels in the central display area of ​​the curved display panel are input into the test grayscale, or all pixels of the same color as the test pixel in the central display area of ​​the curved display panel are input into the test grayscale. The compensation grayscale of the test pixel at each test grayscale is obtained through the target brightness and the actual brightness. The compensation grayscale can make the actual brightness of the pixel equal to the target brightness of the corresponding test grayscale.

[0107] In some embodiments, the first compensation formula determined using two sets of test data is:

[0108] y1=x*Gain+Offset;

[0109] Among them, Gain and Offset are compensation coefficients, x is the test grayscale, and y1 is the compensation grayscale.

[0110] Of course, more than three groups of test data may be obtained, and the first compensation formula may be determined using more than three groups of test data.

[0111] In some embodiments, at least three sets of test data may be used to determine the first compensation formula as follows:

[0112] y1=x*Gain12+x*Gain2+Offset,

[0113] Among them, Offset, Gain1, Gain2 are compensation coefficients, x is the test grayscale, and y1 is the compensation grayscale.

[0114] The second compensation formula obtained by using the first compensation formula and the angle correction coefficient is:

[0115] y=y1*K, K=(1 / Lθ%)^(-1 / γ);

[0116] Among them, y is the actual compensation grayscale, K is the angle correction coefficient, θ is the screen viewing angle, that is, the angle between the normal of the central area of ​​the curved display panel and the normal of the pixel area, Lθ% is the brightness attenuation ratio when the screen viewing angle is θ, and γ is the gamma value.

[0117] According to the gamma formula (gray1 / gray2)^γ=L1 / L2, then (y / y1)^γ=(L0° / Lθ)%, and the formula can be derived to obtain K=(1 / Lθ%)^(-1 / γ). Figure 3 As shown, there are different screen viewing angles at different positions of the curved display panel. For the central pixel of the curved display panel, the screen viewing angle is 0°. For pixels at other positions of the curved display panel, the screen viewing angle is the angle between the normal of the central area of ​​the curved display panel and the normal of the area where the pixel is located.

[0118] The curved display panel can be longitudinally divided into a plurality of display areas along the first direction. The K value of each display area is determined according to the screen viewing angle optical characteristics and the curved surface structure, and then the corresponding second compensation formula is determined.

[0119] The above embodiment takes the test pixel as a red pixel as an example to illustrate the pixel compensation method of the present invention. The above embodiment can be used to obtain the second compensation formula for the red pixel; in addition, a green test pixel and a blue test pixel can also be selected to obtain the second compensation formula for the blue pixel and the second compensation formula for the green pixel in the same way. In addition, in this embodiment, one test pixel can be selected or multiple test pixels can be selected.

[0120] In a specific example, taking the resolution of the curved display panel as 1920*720 as an example, Figure 4 As shown, a group of test pixels is selected from the center column and the edge column of the curved display panel, and each group of test pixels includes a red pixel (R), a green pixel (G), and a blue pixel (B). The first test grayscale - grayscale 1 is input to the curved display panel, and the CCD camera of the curved display panel is taken to obtain the brightness data of all pixels under grayscale 1: for the test pixels in the edge column, the actual brightness of the red pixel is 2.48, the actual brightness of the green pixel is 8.19, and the actual brightness of the blue pixel is 1.09; for the test pixels in the center column, the actual brightness of the red pixel is 2.87, the actual brightness of the green pixel is 8.46, and the actual brightness of the blue pixel is 1.31. The second test grayscale - Grayscale 2 is input to the curved display panel, and the CCD camera of the curved display panel is taken to obtain the brightness data of all pixels under Grayscale 2: for the test pixels in the edgemost column, the actual brightness of the red pixel is 156, the actual brightness of the green pixel is 665, and the actual brightness of the blue pixel is 50.1; for the test pixels in the center column, the actual brightness of the red pixel is 180, the actual brightness of the green pixel is 682, and the actual brightness of the blue pixel is 58.6.

[0121] Taking the center brightness of the curved display panel as the target brightness, the gain and offset values ​​can be calculated according to the formula y1=x*Gain+Offset and the gamma formula. For red pixels, the gain and offset values ​​are 1.07 and 0.02 respectively; for green pixels, the gain and offset values ​​are 1.01 and 0.16 respectively; for blue pixels, the gain and offset values ​​are 1.07 and 0.48 respectively.

[0122] According to the first compensation formula, the initial compensation grayscale of the edgemost column of pixels can be calculated:

[0123] For red pixels, when the target grayscale is 31 grayscale, the initial compensation grayscale is 33 grayscale; when the target grayscale is 225 grayscale, the initial compensation grayscale is 240 grayscale;

[0124] For green pixels, when the target grayscale is 31 grayscale, the initial compensation grayscale is 32 grayscale; when the target grayscale is 225 grayscale, the initial compensation grayscale is 228 grayscale;

[0125] For a blue pixel, when the target grayscale is grayscale 31, the initial compensation grayscale is grayscale 34; when the target grayscale is grayscale 225, the initial compensation grayscale is grayscale 242.

[0126] According to the formula y=y1*K, K=(1 / Lθ%)^(-1 / γ), the actual compensation grayscale after angle correction can be calculated. Figure 5 is a schematic diagram of the relationship between the screen viewing angle and brightness at different positions of the curved display panel. Table 1 is a schematic diagram of the relationship between the screen viewing angle and brightness at different positions of the curved display panel, wherein the brightness at the center position of the curved display panel is set to 1.

[0127] Table 1

[0128]

[0129] For the edgemost column of pixels, the value of θ is 20°. According to the brightness attenuation characteristics of the curved display panel, when θ is 20°, the brightness of R, G, and B decays to 92%, 89%, and 84% of the brightness at the center, respectively. The gamma of R, G, and B is 2.2. Calculated by the second compensation formula, the actual compensation grayscale of the edgemost column of pixels is:

[0130] For red pixels, when the target grayscale is 31 grayscale, the actual compensation grayscale is 32 grayscale; when the target grayscale is 225 grayscale, the actual compensation grayscale is 231 grayscale;

[0131] For green pixels, when the target grayscale is 31 grayscale, the actual compensation grayscale is 30 grayscale; when the target grayscale is 225 grayscale, the actual compensation grayscale is 216 grayscale;

[0132] For a blue pixel, when the target grayscale is grayscale 31, the actual compensation grayscale is grayscale 31; when the target grayscale is grayscale 225, the actual compensation grayscale is grayscale 224.

[0133] Through the technical solution of this embodiment, the brightness of the curved display panel can be accurately compensated to improve the problem of uneven brightness.

[0134] An embodiment of the present invention further provides a display device, comprising the pixel compensation device as described above.

[0135] The display device includes but is not limited to: a radio frequency unit, a network module, an audio output unit, an input unit, a sensor, a display unit, a user input unit, an interface unit, a memory, a processor, and a power supply. Those skilled in the art will appreciate that the structure of the above-mentioned display device does not constitute a limitation on the display device, and the display device may include more or less of the above-mentioned components, or a combination of certain components, or different component arrangements. In an embodiment of the present invention, the display device includes but is not limited to a display, a mobile phone, a tablet computer, a television, a wearable electronic device, a navigation display device, and the like.

[0136] The display device may be any product or component with a display function, such as a television, a monitor, a digital photo frame, a mobile phone, a tablet computer, etc., wherein the display device further includes a flexible circuit board, a printed circuit board and a backplane.

[0137] In the various method embodiments of the present invention, the serial numbers of the steps cannot be used to limit the sequence of the steps. For ordinary technicians in this field, without paying creative work, changes to the sequence of the steps are also within the protection scope of the present invention.

[0138] It should be noted that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the embodiments, since they are basically similar to the product embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the product embodiments.

[0139] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0140] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0141] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A pixel compensation method, characterized in that: include: Acquire at least two groups of test data, each group of the test data includes a test grayscale of a test pixel and a corresponding compensation grayscale, and the test pixel can achieve a target brightness when the compensation grayscale is input; Obtaining a first compensation formula using the at least two sets of test data, wherein the first compensation formula is a relationship between a test grayscale of a pixel and an initial compensation grayscale; A second compensation formula is obtained by using the first compensation formula and the angle correction coefficient, wherein the second compensation formula is a relationship between a test grayscale of a pixel of the curved display panel and an actual compensation grayscale, the curved display panel is divided into a plurality of display areas along a first direction, different display areas have different angle correction coefficients, and the first direction is perpendicular to a bending direction of the curved display panel; Inputting the target grayscale into the second compensation formula to calculate the corresponding actual compensation grayscale; Wherein, the second compensation formula is: y=y1*K, K=(1 / Lθ%)^(-1 / γ); Among them, y is the actual compensation grayscale, K is the angle correction coefficient, θ is the screen viewing angle, that is, the angle between the normal of the central area of ​​the curved display panel and the normal of the pixel area, Lθ% is the brightness attenuation ratio when the screen viewing angle is θ, and γ is the gamma value.

2. The pixel compensation method according to claim 1, characterized in that: Acquiring a set of the test data includes: Inputting a test grayscale to the test pixel; Taking a photo of the curved display panel, and obtaining the actual brightness of the test pixel according to the photographed image; The compensated grayscale of the test pixel is calculated according to the actual brightness and the target brightness, and the target brightness is the average brightness of the pixels in the central area of ​​the curved display panel when the test grayscale is input.

3. The pixel compensation method according to claim 1, characterized in that: The test pixel is a green pixel, a blue pixel or a red pixel.

4. The pixel compensation method according to claim 1, characterized in that: The first compensation formula determined using at least two sets of test data is: y1=x*Gain+Offset; Among them, Gain and Offset are compensation coefficients, x is the test grayscale, and y1 is the compensation grayscale.

5. The pixel compensation method according to claim 1, characterized in that: The first compensation formula determined using at least three sets of test data is: y1=x*Gain1 2 +x*Gain2+Offset, Among them, Offset, Gain1, Gain2 are compensation coefficients, x is the test grayscale, and y1 is the compensation grayscale.

6. A pixel compensation device, characterized in that: include: An acquisition module, used for acquiring at least two groups of test data, each group of the test data includes a test grayscale of a test pixel and a corresponding compensation grayscale, and the test pixel can reach a target brightness when the compensation grayscale is input; A first compensation module, configured to obtain a first compensation formula using the at least two sets of test data, wherein the first compensation formula is a relationship between a test grayscale of a pixel and an initial compensation grayscale; a second compensation module, configured to obtain a second compensation formula by using the first compensation formula and the angle correction coefficient, wherein the second compensation formula is a relationship between a test grayscale of a pixel of the curved display panel and an actual compensation grayscale, the curved display panel being divided into a plurality of display areas along a first direction, different display areas having different angle correction coefficients, and the first direction being perpendicular to a bending direction of the curved display panel; A processing module, used for inputting the target grayscale into the second compensation formula to calculate the corresponding actual compensation grayscale; Wherein, the second compensation formula is: y=y1*K, K=(1 / Lθ%)^(-1 / γ); Among them, y is the actual compensation grayscale, K is the angle correction coefficient, θ is the screen viewing angle, that is, the angle between the normal of the central area of ​​the curved display panel and the normal of the pixel area, Lθ% is the brightness attenuation ratio when the screen viewing angle is θ, and γ is the gamma value.

7. The pixel compensation device according to claim 6, characterized in that: The acquisition module comprises: An input unit, used for inputting a test grayscale to the test pixel; A shooting unit, used to take a picture of the curved display panel and obtain the actual brightness of the test pixel according to the photographed image; A calculation unit is used to calculate the compensated grayscale of the test pixel according to the actual brightness and the target brightness, and the target brightness is the average brightness of the pixels in the central area of ​​the curved display panel when the test grayscale is input.

8. The pixel compensation device according to claim 6, characterized in that: The first compensation formula determined using at least two sets of test data is: y1=x*Gain+Offset; Among them, Gain and Offset are compensation coefficients, x is the test grayscale, and y1 is the compensation grayscale.

9. The pixel compensation device according to claim 6, characterized in that: The first compensation formula determined using at least three sets of test data is: y1=x*Gain1 2 +x*Gain2+Offset, Among them, Offset, Gain1, Gain2 are compensation coefficients, x is the test grayscale, and y1 is the compensation grayscale.

10. A display device, characterized in that: It comprises a pixel compensation device as described in any one of claims 6-9.

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