Display device and defect pixel compensation method of display device

Abstract

The invention discloses a display device and a defect pixel compensation method of the display device, the display device comprises a display panel and a processor, the processor determines the defect type of a defect sub-pixel and an initial gray scale value corresponding to the defect sub-pixel; determining at least one target gray-scale value according to the defect type of the defective sub-pixel, the initial gray-scale value and a plurality of to-be-displayed gray-scale values corresponding to the defective pixel to which the defective sub-pixel belongs; based on the at least one target gray-scale value, updating the to-be-displayed gray-scale values corresponding to other sub-pixels in the defective pixels; and the display panel displays the to-be-displayed image after the plurality of to-be-displayed gray-scale values corresponding to the defect pixels are updated. According to the target gray-scale value, the to-be-displayed gray-scale values of other sub-pixels except the defective sub-pixels in the defective pixels are updated, so that the display color cast problem caused by the defective sub-pixels is compensated, the perceptibility of the defective sub-pixels in human eyes is reduced, and the display effect of the display device is improved.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a display device and a method for compensating defective pixels of a display device. Background Art

[0002] In display devices of types such as liquid crystal, organic light-emitting diode (OLED), and micro light-emitting diode (Micro LED), a display panel includes a plurality of pixels, and each pixel is composed of a plurality of sub-pixels;

[0003] However, in the process of mass production of display panels, due to manufacturing defects, individual sub-pixels emit light abnormally and are no longer controllable. For example, sub-pixels appear as non-light dark spots, slightly bright constant bright spots, constant bright spots, etc., resulting in the generation of defective pixels. During the use of the display panel, the defective pixels will cause display color deviation problems, seriously affecting the display effect of the display device. Summary of the Invention

[0004] The present invention provides a display device and a method for compensating defective pixels of a display device, so as to improve the problem of display color deviation caused by the existence of defective pixels in the display panel of the prior art.

[0005] In a first aspect, an embodiment of the present invention provides a display device, including a display panel and a processor. The display panel includes a pixel array composed of a plurality of pixels. One pixel in the pixel array includes a plurality of sub-pixels, where:

[0006] The processor is configured to perform the following operations:

[0007] Determine the defect type of a defective sub-pixel and the initial gray scale value corresponding to the defective sub-pixel, where the defect type includes a first defect type for characterizing that the defective sub-pixel is constantly on, and a second defect type for characterizing that the defective sub-pixel is constantly off;

[0008] According to the defect type of the defective sub-pixel, the initial gray scale value corresponding to the defective sub-pixel, and a plurality of gray scale values to be displayed corresponding to the defective pixel, determine at least one target gray scale value, where the defective pixel is the pixel to which the defective sub-pixel belongs;

[0009] Based on the at least one target gray scale value, update the gray scale values to be displayed corresponding to other sub-pixels, where the other sub-pixels are the sub-pixels in the defective pixel except the defective sub-pixel;

[0010] The display panel is configured to display the image to be displayed after updating the multiple gray levels to be displayed corresponding to the defective pixel.

[0011] In the display device provided by the embodiments of the present invention, the target gray level is determined based on the defect type, the initial gray level, and the gray level to be displayed of the defective sub-pixel, and the gray levels to be displayed of the other sub-pixels in the defective pixel except the defective sub-pixel are updated according to the target gray level, so as to compensate for the display color cast problem caused by the defective sub-pixel, reduce the perceptibility of the defective sub-pixel in the human eye, and improve the display effect of the display device.

[0012] In an optional embodiment, the processor is specifically configured to perform the following operations:

[0013] When it is determined that the defect type of the defective sub-pixel is the first defect type and the gray level to be displayed corresponding to the defective sub-pixel is not the minimum gray level:

[0014] Determine the reference brightness value, the first reference chromaticity value, and the second reference chromaticity value corresponding to the defective pixel according to the multiple gray levels to be displayed corresponding to the defective pixel;

[0015] Construct a target color difference function based on the initial gray level, the reference brightness value, the first reference chromaticity value, and the second reference chromaticity value corresponding to the defective sub-pixel;

[0016] Take the gray level that minimizes the value of the target color difference function as the target gray level.

[0017] The above display device compensates for the color cast phenomenon caused by the defective sub-pixel based on the minimum color difference method, that is, constructs a target color difference function through the reference brightness value, the first reference chromaticity value, and the second reference chromaticity value obtained by converting multiple gray levels to be displayed, and the initial gray level corresponding to the defective sub-pixel, and determines the target gray level according to the target color difference function. After updating the gray levels to be displayed of other sub-pixels with the target gray level, the color difference between the actual display chromaticity and the target display chromaticity of the defective pixel is minimized, achieving the purpose of compensating for the color cast phenomenon caused by the defective sub-pixel and improving the display effect of the display device.

[0018] In an optional embodiment, the processor is specifically configured to perform the following operations:

[0019] Perform conversion processing on the multiple gray levels to be displayed to obtain multiple stimulus values corresponding to the defective pixel, where the multiple gray levels to be displayed belong to the RGB color space and the multiple stimulus values belong to the CIE XYZ color space;

[0020] Based on the multiple stimulus values, obtain the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value belonging to the CIE LAB color space.

[0021] The above display device converts multiple to-be-displayed grayscale values belonging to the RGB color space into multiple stimulus values belonging to the CIEXYZ color space, and then converts the multiple stimulus values into a reference lightness value, a first reference chromaticity value, and a second reference chromaticity value belonging to the CIE LAB color space, thereby realizing the conversion of the color space.

[0022] In an optional embodiment, the processor is specifically configured to perform the following operations:

[0023] When it is determined that the defect type of the defective sub-pixel is the first defect type and the to-be-displayed grayscale value corresponding to the defective sub-pixel is the minimum grayscale value, or

[0024] When it is determined that the defect type of the defective sub-pixel is the second defect type and the to-be-displayed grayscale value corresponding to the defective sub-pixel is not the minimum grayscale value:

[0025] Based on the first correspondence relationship, and according to the color category of the defective sub-pixel and the initial grayscale value corresponding to the defective sub-pixel, determine the target grayscale value;

[0026] Wherein, the first correspondence relationship is used to represent the correspondence relationship between the colors and grayscale values of multiple sub-pixels in a pixel, and the first correspondence relationship is determined based on the Helmholtz-Kohlrausch effect.

[0027] The above display device compensates for the color cast phenomenon caused by defective sub-pixels based on the minimum perceptible brightness method of the Helmholtz-Kohlrausch effect, that is, determines the first correspondence relationship through the Helmholtz-Kohlrausch effect, and searches in the first correspondence relationship according to the color category and the initial grayscale value of the defective sub-pixel to determine the target grayscale value. After updating the to-be-displayed grayscale values of other sub-pixels with the target grayscale value, the user's actual perception of the defective pixel is reduced, thereby reducing the user's actual perception of the color cast phenomenon caused by the defective sub-pixel and improving the user experience and the display effect of the display device.

[0028] In an optional embodiment, the processor is specifically configured to perform the following operations:

[0029] When it is determined that the defect type of the defective sub-pixel is the second defect type, use the minimum grayscale value as the target grayscale value.

[0030] When the defective sub-pixel shows a dark dot state, the display gray-scale values of the other sub-pixels in the defective pixel except the defective sub-pixel are updated to the minimum gray-scale value, so that the defective pixel appears as a black dot, reducing the perceived degree of the defective pixel in the eyes of the user and improving the user experience.

[0031] In an alternative embodiment, the processor is further configured to perform the following operations:

[0032] Determine the gray-scale difference between the initial gray-scale value corresponding to the defective sub-pixel and the display gray-scale value corresponding to the defective sub-pixel;

[0033] If the ratio of the gray-scale difference to the total gray-scale range is greater than or equal to a preset ratio threshold, determine the at least one target gray-scale value;

[0034] If the ratio of the gray-scale difference to the total gray-scale range is less than the preset ratio threshold, keep the display gray-scale values corresponding to the defective pixel unchanged.

[0035] After determining the defect type, the initial gray-scale value, and the display gray-scale value of the defective sub-pixel, the above display device determines whether to compensate for the color cast phenomenon caused by the defective sub-pixel based on the ratio of the gray-scale difference to the total gray-scale range and the magnitude relationship of the preset ratio threshold, so as to reduce the data processing amount and improve the processing efficiency of the display device.

[0036] In a second aspect, an embodiment of the present invention provides a method for compensating defective pixels of a display device, which is applied to the display device described in any one of the embodiments in the first aspect above. The method includes:

[0037] Determine the defect type of the defective sub-pixel and the initial gray-scale value corresponding to the defective sub-pixel, where the defect type includes a first defect type for characterizing that the defective sub-pixel is always on and a second defect type for characterizing that the defective sub-pixel is always off;

[0038] Determine at least one target gray-scale value according to the defect type of the defective sub-pixel, the initial gray-scale value corresponding to the defective sub-pixel, and the display gray-scale values corresponding to the defective pixel, where the defective pixel is the pixel to which the defective sub-pixel belongs;

[0039] Based on the at least one target gray-scale value, update the display gray-scale values corresponding to the other sub-pixels, where the other sub-pixels are the sub-pixels in the defective pixel except the defective sub-pixel;

[0040] After the display gray-scale values corresponding to the defective pixel are updated, display the image to be displayed.

[0041] In an alternative embodiment, determining at least one target gray level value according to the defect type of the defective sub-pixel, the initial gray level value corresponding to the defective sub-pixel, and a plurality of gray levels to be displayed corresponding to the defective pixel includes:

[0042] When it is determined that the defect type of the defective sub-pixel is the first defect type and the gray level to be displayed corresponding to the defective sub-pixel is not the minimum gray level:

[0043] According to a plurality of gray levels to be displayed corresponding to the defective pixel, determine a reference lightness value, a first reference chromaticity value, and a second reference chromaticity value corresponding to the defective pixel;

[0044] Based on the initial gray level value corresponding to the defective sub-pixel, the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value, construct a target color difference function;

[0045] Take the gray level value that minimizes the value of the target color difference function as the target gray level value.

[0046] In an alternative embodiment, determining a reference lightness value, a first reference chromaticity value, and a second reference chromaticity value corresponding to the defective pixel according to a plurality of gray levels to be displayed corresponding to the defective pixel includes:

[0047] Perform a conversion process on the plurality of gray levels to be displayed to obtain a plurality of stimulus values corresponding to the defective pixel, where the plurality of gray levels to be displayed belong to the RGB color space and the plurality of stimulus values belong to the CIE XYZ color space;

[0048] According to the plurality of stimulus values, obtain the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value belonging to the CIE LAB color space.

[0049] In an alternative embodiment, determining at least one target gray level value according to the defect type of the defective sub-pixel, the initial gray level value corresponding to the defective sub-pixel, and a plurality of gray levels to be displayed corresponding to the defective pixel includes:

[0050] When it is determined that the defect type of the defective sub-pixel is the first defect type and the gray level to be displayed corresponding to the defective sub-pixel is the minimum gray level, or

[0051] When it is determined that the defect type of the defective sub-pixel is the second defect type and the gray level to be displayed corresponding to the defective sub-pixel is not the minimum gray level:

[0052] Based on a first correspondence relationship, and according to the color category of the defective sub-pixel and the initial gray level value corresponding to the defective sub-pixel, determine the target gray level value;

[0053] Among them, the first correspondence relationship is used to represent the correspondence relationship between the colors of multiple sub-pixels in a pixel and the gray-scale value, and the first correspondence relationship is determined based on the Helmholtz-Kohlrausch effect.

[0054] In an alternative embodiment, the determining of at least one target gray-scale value according to the defect type of the defective sub-pixel, the initial gray-scale value corresponding to the defective sub-pixel, and the multiple gray-scale values to be displayed corresponding to the defective pixel includes:

[0055] When it is determined that the defect type of the defective sub-pixel is the second defect type, the minimum gray-scale value is used as the target gray-scale value.

[0056] In an alternative embodiment, after determining the defect type of the defective sub-pixel and the initial gray-scale value corresponding to the defective sub-pixel, it further includes:

[0057] Determining the gray-scale difference between the initial gray-scale value corresponding to the defective sub-pixel and the gray-scale value to be displayed corresponding to the defective sub-pixel;

[0058] If the ratio of the gray-scale difference to the total gray-scale range is greater than or equal to a preset ratio threshold, then determine the at least one target gray-scale value;

[0059] If the ratio of the gray-scale difference to the total gray-scale range is less than the preset ratio threshold, then keep the multiple gray-scale values to be displayed corresponding to the defective pixel unchanged.

[0060] In addition, for the technical effects brought by any embodiment in the second aspect, reference may be made to the technical effects brought by different embodiments in the first aspect, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0062] Figure 1 It is a schematic diagram of an application scenario of a display device provided by an embodiment of the present invention;

[0063] Figure 2 It is a schematic diagram of the structure of a display device provided by an embodiment of the present invention;

[0064] Figure 3 It is a schematic diagram of the structure of a pixel provided by an embodiment of the present invention;

[0065] Figure 4 Schematic diagram of the working process of a display device provided by an embodiment of the present invention;

[0066] Figure 5 Schematic diagram of the structure of a defective sub-pixel provided by an embodiment of the present invention;

[0067] Figure 6 Another schematic diagram of the structure of a defective sub-pixel provided by an embodiment of the present invention;

[0068] Figure 7 Schematic diagram of the structure for a processing device to determine a defective sub-pixel provided by an embodiment of the present invention;

[0069] Figure 8 Schematic diagram of the working process for a display device to determine whether to update the grayscale value provided by an embodiment of the present invention;

[0070] Figure 9 Schematic diagram of the working process for a display device to determine the target grayscale value provided by an embodiment of the present invention;

[0071] Figure 10 Schematic diagram of the working process of grayscale value conversion provided by an embodiment of the present invention;

[0072] Figure 11 Schematic diagram of different visual results of pixels corresponding to different grayscale value combinations provided by an embodiment of the present invention;

[0073] Figure 12 Schematic diagram of the complete working process of a display device provided by an embodiment of the present invention;

[0074] Figure 13 Schematic diagram of the module structure of a defective pixel compensation device for a display device provided by an embodiment of the present invention. Detailed implementation manners

[0075] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0076] The technical solutions in the embodiments of the present invention will be clearly and elaborately described below in conjunction with the accompanying drawings. Among them, in the description of the embodiments of the present invention, unless otherwise specified, " / " means "or". For example, A / B may mean A or B. The "and / or" in the text is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present invention, "a plurality" means two or more than two.

[0077] Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0078] In the process of mass production of display panels, due to process defects, individual sub-pixels emit light abnormally and are no longer controllable. For example, the sub-pixels appear as non-lit dark spots, slightly lit constant bright spots, constant bright spots, etc., resulting in the generation of defective pixels. During the use of the display panel, users will perceive an obvious display color deviation problem at the panel position where the defective pixels are located, which affects the display effect and reduces the user experience.

[0079] Currently, for the defective pixels existing in display panels, hardware repair methods are usually adopted. However, due to the limited internal repair capabilities of panel manufacturers, only partial repair of defective pixels can be achieved. For display devices with defective pixels that cannot be repaired, some panel manufacturers will take the way of scrapping, resulting in relatively large economic losses for the manufacturers. Some will flow to users, but this will cause many user complaints and affect the brand reputation of the manufacturers.

[0080] Based on this, the embodiments of the present invention provide a display device and a method for compensating defective pixels of the display device to compensate for the display color deviation problem of the display panel caused by defective sub-pixels, reduce the perception of defective sub-pixels in the human eye, and improve the display effect of the display device.

[0081] The application scenarios of the display device provided by the present invention will be introduced below in conjunction with the accompanying drawings:

[0082] Figure 1 FIG. shows a schematic diagram of an application scenario of the display device provided by the embodiments of the present invention, as Figure 1 shown. The application scenario includes a display device 100 and a user 200, where:

[0083] The display device 100 can be a liquid crystal display, a Micro LED display, an OLED display, a projection display device, etc. The specific type of display device, its size and resolution are not limited. Those skilled in the art can understand that the display device 100 can be modified in terms of performance and configuration as needed.

[0084] During the process when the user 200 uses the display device to view videos or images, the display device 100 compensates and adjusts the grayscale value to be displayed of the defective pixel by using the method provided in the embodiment of the present invention, so as to improve the picture display effect of the display device 100 and enhance the experience of the user 200.

[0085] Of course, the method provided in the embodiment of the present invention is not limited to Figure 1 the application scenario shown, and can also be used in other possible application scenarios, which are not limited in the embodiment of the present invention.

[0086] After introducing the application scenario of the embodiment of the present invention, the following further elaborates on the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. And without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0087] The following describes the embodiments of the present invention in detail with reference to the accompanying drawings.

[0088] Figure 2 FIG. shows a schematic structural diagram of a display device provided by an embodiment of the present invention. As Figure 2 shown, the display device 100 includes a display panel 110 and a processor 120. The display panel 110 includes a pixel array composed of a plurality of pixels, and one pixel in the pixel array includes a plurality of sub-pixels.

[0089] It should be noted that the display device in the embodiment of the present invention can be a liquid crystal display device, or an LED (Light-Emitting Diode) type display device, such as an OLED display device, a Micro LED display device, etc., or other display devices that use sub-pixels for display. The embodiment of the present invention does not impose any restrictions on this.

[0090] In one or more embodiments, the processor 120 can be a TCON (Timing Controller).

[0091] In one or more embodiments, one pixel includes three sub-pixels: a red (Red, R) sub-pixel, a green (Green, G) sub-pixel, and a blue (Blue, B) sub-pixel.

[0092] Figure 3 shows a schematic structural diagram of a pixel, as Figure 3 shown, pixel Pixel 1 includes an R sub-pixel, a G sub-pixel, and a B sub-pixel.

[0093] It should be noted that in the embodiments of the present invention, the three sub-pixels included in one pixel can be sub-pixels of red, green, and blue colors, or can be sub-pixels of red, yellow, and blue colors, or can be sub-pixels of other colors. The embodiments of the present invention do not impose any restrictions on this.

[0094] The following embodiments will be described by taking the R, G, and B three sub-pixels included in one pixel as an example:

[0095] As Figure 4 shown, the processor 120 is used to perform the operations in steps S401 to S403:

[0096] Step S401, determine the defect type of the defective sub-pixel and the initial gray scale value corresponding to the defective sub-pixel.

[0097] Among them, the defect type includes a first defect type for characterizing that the defective sub-pixel is always on, and a second defect type for characterizing that the defective sub-pixel is always off;

[0098] In a specific implementation, since the defective sub-pixel emits light abnormally and is no longer controlled, therefore, the defective sub-pixel always maintains the brightness corresponding to the initial gray scale value and cannot be changed.

[0099] In one or more embodiments, the initial gray scale value corresponding to the defective sub-pixel of the first defect type can be any gray scale value among the non-minimum gray scale values, and the initial gray scale value corresponding to the defective sub-pixel of the second defect type is the minimum gray scale value. The value range of the gray scale value is 0-255.

[0100] Exemplarily, the initial gray scale value corresponding to the defective sub-pixel of the first defect type can be 128, 169, 255, etc.; among the defective sub-pixels of the first defect type, the defective sub-pixels with the initial gray scale value being a non-maximum gray scale value (255) can be shown in a slightly bright and always-on defective state; the initial gray scale value corresponding to the defective sub-pixel of the second defect type is 0.

[0101] Figure 5 shows a schematic structural diagram of a defective sub-pixel:

[0102] Figure 5 In (a) of, it is the lighting state of the R, G, and B three sub-pixels in a pixel Pixel 1 after receiving a gray scale value of 255. Combining with (a), it can be seen that the R sub-pixel, the G sub-pixel, and the B sub-pixel all emit light normally, indicating that the R, G, and B three sub-pixels are all normal sub-pixels.

[0103] Figure 5 In (b), it shows the lighting state of the R, G, and B sub-pixels in a pixel Pixel 1 after receiving a grayscale value of 255. Combining with (b), it can be seen that both the R sub-pixel and the G sub-pixel emit light normally, but the B sub-pixel is not lit. This indicates that both the R and G sub-pixels are normal sub-pixels, and the B sub-pixel is a defective sub-pixel showing a dark point state, that is, no matter what grayscale value is provided to the B sub-pixel, the B sub-pixel cannot be lit. Therefore, the defect type of the B sub-pixel is the second defect type.

[0104] Figure 6 It shows a schematic structural diagram of a defective sub-pixel:

[0105] Figure 6 In (a), it shows the lighting state of the R, G, and B sub-pixels in a pixel Pixel 1 after receiving a grayscale value of 0. Combining with (a), it can be seen that none of the R sub-pixel, the G sub-pixel, and the B sub-pixel emit light, indicating that all the R, G, and B sub-pixels are normal sub-pixels.

[0106] Figure 6 In (b), it shows the lighting state of the R, G, and B sub-pixels in a pixel Pixel 1 after receiving a grayscale value of 0. Combining with (b), it can be seen that both the R sub-pixel and the G sub-pixel do not emit light, but the B sub-pixel emits light, and it is detected that the grayscale value corresponding to the B sub-pixel is 255. This indicates that both the R and G sub-pixels are normal sub-pixels, and the B sub-pixel is a defective sub-pixel showing a bright point state, that is, no matter what grayscale value is provided to the B sub-pixel, the B sub-pixel will be lit with the brightness of a grayscale value of 255. Therefore, the defect type of the B sub-pixel is the first defect type.

[0107] Figure 6 In (c), it shows the lighting state of the R, G, and B sub-pixels in a pixel Pixel 1 after receiving a grayscale value of 0. Combining with (c), it can be seen that both the R sub-pixel and the G sub-pixel do not emit light, but the B sub-pixel emits light, and it is detected that the grayscale value corresponding to the B sub-pixel is 128. This indicates that both the R and G sub-pixels are normal sub-pixels, and the B sub-pixel is a defective sub-pixel showing a slightly bright point state, that is, no matter what grayscale value is provided to the B sub-pixel, the B sub-pixel will be lit with the brightness of a grayscale value of 128. Therefore, the defect type of the B sub-pixel is the first defect type.

[0108] In one or more embodiments, during the inspection process before the display device product leaves the factory, it is determined whether there are defective pixels in the display panel through the observation of quality inspection personnel.

[0109] In one or more embodiments, during the inspection process before the display device product leaves the factory, a test image displayed on the display panel is captured by an imaging device such as a camera, and the pixel data of the test image captured by the imaging device is analyzed by a processing device such as a host computer to determine the position information of defective pixels in the display panel and the relevant parameters of defective sub-pixels in the defective pixels, such as defect type, gray-scale value, color category of sub-pixels, etc.

[0110] In a specific implementation, Figure 7 The structural schematic diagram of the processing device such as a host computer analyzing the pixel data of the test image is shown.

[0111] Combined with (a), it can be seen that the host computer scans and analyzes the pixel data of the test image row by row in the order from top to bottom to determine the position information and relevant parameters of defective pixels.

[0112] Combined with (b), it can be seen that the host computer scans and analyzes the pixel data of the test image column by column in the order from left to right to determine the position information and relevant parameters of defective pixels.

[0113] It should be understood that the above two embodiments are only for illustrative purposes and should not impose any limitation on the present invention.

[0114] Exemplarily, assume that the pixel array of the display panel includes M rows and N columns of pixels, and the host computer detects that pixel Pixel23 is a defective pixel. Among them, the defective sub-pixel in the defective pixel Pixel 23 is B sub-pixel 23, and B sub-pixel 23 shows a constant-on state and the initial gray-scale value is 128.

[0115] In a specific implementation, when the display device 100 is displaying the image to be displayed, the processor 120 obtains the gray-scale value to be displayed corresponding to each sub-pixel of the image to be displayed. For the defective sub-pixels determined in step S401, the processor 120 is further configured to perform the following operations:

[0116] In an alternative embodiment, as Figure 8 shown, the processor 120 is further configured to perform the operations in steps S801 to S804:

[0117] Step S801, determine the gray-scale difference between the initial gray-scale value corresponding to the defective sub-pixel and the gray-scale value to be displayed corresponding to the defective sub-pixel.

[0118] Exemplarily, assume that the defective sub-pixel is B sub-pixel 23 and the initial gray-scale value is b23_0 = 128. If the gray-scale value to be displayed corresponding to B sub-pixel 23 is b23_cur = 200, then the gray-scale difference is: Δb23_cur = b23_cur - b23_0 = 200 - 128 = 72.

[0119] Step S802: Compare the ratio of the grayscale difference to the total grayscale range with a preset ratio threshold.

[0120] In one or more embodiments, the preset ratio threshold is an empirical value and can be flexibly set according to actual business requirements. The embodiments of the present invention do not impose any restrictions on this. For example, the preset ratio threshold is set to 30%.

[0121] In a specific implementation, since the value range of the grayscale value is 0 - 255, the total grayscale range is 255 - 0 = 255.

[0122] Exemplarily, assume that the grayscale difference Δb23_cur determined through step S801 is 72, and the preset ratio threshold is set to 30%. Then the ratio of the grayscale difference to the total grayscale range is:

[0123] Δb23_cur / 255 = 72 / 255 ≈ 28%;

[0124] Assume that the grayscale difference Δb23_cur determined through step S801 is 100. Then the ratio of the grayscale difference to the total grayscale range is: Δb23_cur / 255 = 100 / 255 ≈ 39%.

[0125] Step S803: If the ratio of the grayscale difference to the total grayscale range is greater than or equal to the preset ratio threshold, determine at least one target grayscale value according to the method in step S402.

[0126] Step S804: If the ratio of the grayscale difference to the total grayscale range is less than the preset ratio threshold, keep the multiple grayscale values to be displayed corresponding to the defective pixel unchanged.

[0127] In a specific implementation, when the gap between the grayscale value to be displayed and the initial grayscale value of the defective sub - pixel is less than a certain range, no color difference adjustment operation is performed. When the gap exceeds a certain range value, the target grayscale value for updating the grayscale values to be displayed of other sub - pixels is determined, thereby improving the processing speed of the processor.

[0128] Exemplarily, if it is determined through step S802 that the ratio of the grayscale difference to the total grayscale range is 28%, which is less than the preset ratio threshold of 30%, then step S804 is executed; if it is determined through step S802 that the ratio of the grayscale difference to the total grayscale range is 39%, which is greater than the preset ratio threshold of 30%, then step S803 is executed.

[0129] After determining the defect type, initial grayscale value, and grayscale value to be displayed of the defective sub - pixel, based on the size relationship between the ratio of the grayscale difference to the total grayscale range and the preset ratio threshold, it is determined whether compensation for the color cast phenomenon caused by the defective sub - pixel is required, so as to reduce the data processing volume and improve the processing efficiency of the display device.

[0130] Step S402: Determine at least one target gray level value according to the defect type of the defective sub-pixel, the initial gray level value corresponding to the defective sub-pixel, and the multiple gray levels to be displayed corresponding to the defective pixel.

[0131] Wherein, the defective pixel is the pixel to which the defective sub-pixel belongs.

[0132] In one or more embodiments, the multiple gray levels to be displayed corresponding to the defective pixel include: the gray level to be displayed corresponding to the R sub-pixel, the gray level to be displayed corresponding to the G sub-pixel, and the gray level to be displayed corresponding to the B sub-pixel.

[0133] In an alternative embodiment, when the processor 120 determines that the defect type of the defective sub-pixel is the first defect type and the gray level to be displayed corresponding to the defective sub-pixel is not the minimum gray level value, where the non-minimum gray level value is any gray level value other than the minimum gray level value (0), the determination of the target gray level value is realized based on the minimum color difference method. Specifically:

[0134] As Figure 9 shown, the processor 120 is configured to perform the operations in steps S901 to S903:

[0135] Step S901: Determine the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value corresponding to the defective pixel according to the multiple gray levels to be displayed corresponding to the defective pixel.

[0136] In an alternative embodiment, as Figure 10 shown, the processor 120 realizes step S901 by performing the operations in steps S901-1 to S901-2:

[0137] Step S901-1: Perform conversion processing on the multiple gray levels to be displayed to obtain multiple stimulus values corresponding to the defective pixel.

[0138] Wherein, the multiple gray levels to be displayed belong to the RGB color space, and the multiple stimulus values belong to the CIE XYZ color space.

[0139] In one or more embodiments, the conversion of the multiple gray levels to be displayed into multiple stimulus values can be achieved through the following formula:

[0140]

[0141] Wherein, (R, G, B) is used to represent the multiple gray levels to be displayed, and (X, Y, Z) is used to represent the multiple stimulus values.

[0142] The above formula can also be expressed as:

[0143] X = 0.412453×R / 255 + 0.35758×G / 255 + 0.180423×B / 255;

[0144] Y = 0.212671×R / 255 + 0.71516×G / 255 + 0.072169×B / 255;

[0145] Z = 0.019334×R / 255 + 0.119193×G / 255 + 0.950227×B / 255.

[0146] Exemplarily, assume that the defective pixel is Pixel 23, the defective sub-pixel in the defective pixel Pixel 23 is the B sub-pixel 23, and the R sub-pixel 23 and G sub-pixel 23 in the defective pixel Pixel 23 are controlled normal sub-pixels;

[0147] And assume that the multiple grayscale values to be displayed corresponding to the defective pixel Pixel 23 are (r23_cur, g23_cur, b23_cur), then the multiple stimulus values obtained by conversion can be expressed as:

[0148] X23_cur = 0.412453×r23_cur / 255 + 0.35758×g23_cur / 255 + 0.180423×b23 / 255

[0149] Y23_cur = 0.212671×r23_cur / 255 + 0.71516×g23_cur / 255 + 0.072169×g23_cur / 255

[0150] Z23_cur = 0.019334×r23_cur / 255 + 0.119193×g23_cur / 255 + 0.950227×g23_cur / 255.

[0151] Step S901-2, according to the multiple stimulus values, obtain the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value belonging to the CIE LAB color space.

[0152] In one or more embodiments, converting the multiple stimulus values into the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value can be achieved through the following formulas:

[0153] L = 116f(Y / Yn) - 16

[0154] a = 500[f(X / Xn) - f(Y / Yn)]

[0155] b = 200[f(Y / Yn) - f(Z / Zn)]

[0156] Among them, (X, Y, Z) is used to represent multiple stimulus values; L is used to represent the reference lightness value, a is used to represent the first reference chromaticity value, and b is used to represent the second reference chromaticity value; Xn, Yn, Zn are specified coefficients;

[0157] Among them, the function f can be determined in the following way:

[0158]

[0159] Among them, t = Y / Yn, or t = X / Xn, or t = Z / Zn.

[0160] It should be noted that the specified coefficients Xn, Yn, Zn can be determined according to the D65 light source (Artificial Daylight 6500K, the international standard daylight light source), or can be determined according to the D50 light source, or can also be determined according to other applicable light sources. The embodiments of the present invention do not make any restrictions on this.

[0161] For example, if based on the D65 light source, then Xn = 0.950456, Yn = 1.0, Zn = 1.088754.

[0162] Exemplarily, for the multiple stimulus values corresponding to the defective pixel Pixel 23 being (X23_cur, Y23_cur, Z23_cur), the converted reference lightness value can be expressed as:

[0163] L23_cur = 116f(Y23_cur / 1.0) - 16

[0164] The converted first reference chromaticity value can be expressed as:

[0165] a23_cur = 500[f(X23_cur / 0.950456) - f(Y23_cur / 1.0)]

[0166] The converted second reference chromaticity value can be expressed as:

[0167] b23_cur = 200[f(Y23_cur / 1.0) - f(Z23_cur / 1.088754)].

[0168] By converting multiple grayscale values to be displayed belonging to the RGB color space into multiple stimulus values belonging to the CIE XYZ color space, and then converting the multiple stimulus values into a reference lightness value, a first reference chromaticity value, and a second reference chromaticity value belonging to the CIE LAB color space, the conversion of the color space is thus achieved.

[0169] Step S902: Based on the initial gray level value, reference lightness value, first reference chromaticity value, and second reference chromaticity value corresponding to the defective sub-pixel, construct a target color difference function.

[0170] In one or more embodiments, among the defective pixels, there is a defective sub-pixel with an initial gray level value of b_0. Assume that the gray level values of the other two sub-pixels in the defective pixel are m and n respectively. That is, the gray level value corresponding to the defective pixel can be expressed as (m, n, b_0). Through the method in step S901, convert (m, n, b_0) into a sample lightness value, a first sample chromaticity value, and a second sample chromaticity value.

[0171] And construct the target color difference function ΔE through the following formula:

[0172]

[0173] Where: ΔL = L reference -L sample , in the formula: L reference represents the reference lightness value, and L sample represents the sample lightness value;

[0174] Δa = a reference -a sample , in the formula: a reference represents the first reference chromaticity value, and a sample represents the first sample chromaticity value;

[0175] Δb = b reference -b sample , in the formula: b reference represents the second reference chromaticity value, and b sample represents the second sample chromaticity value.

[0176] Therefore, the constructed target color difference function ΔE includes functions of variables m and n, that is, the target color difference function ΔE = g(m, n), where the value ranges of m and n are both 0 - 255.

[0177] Exemplarily, if the defect type of the defective sub-pixel is the first defect type, then b_0 may take values such as 128, 200, 255, etc.; if the defect type of the defective sub-pixel is the second defect type, then b_0 = 0.

[0178] In one or more embodiments, a defective pixel includes two defective sub-pixels with initial gray levels of r_0 and b_0 respectively. The gray level of the other sub-pixel in the defective pixel is set to k, that is, the gray level corresponding to the defective pixel can be expressed as (r_0, k, b_0). Through the method in step S901, (r_0, k, b_0) is converted into a sample lightness value, a first sample chromaticity value, and a second sample chromaticity value; and the target color difference function ΔE is constructed in the same manner as in the above embodiments.

[0179] The constructed target color difference function ΔE includes the variable k, that is, the target color difference function ΔE = q(k), where the value range of k is 0 - 255.

[0180] Step S903: Use the gray level value that minimizes the value of the target color difference function as the target gray level value.

[0181] In a specific implementation, by traversing the values of m and n, find the gray level value that minimizes the value of the target color difference function and use it as the target gray level value.

[0182] Exemplarily, assume that the multiple gray levels to be displayed corresponding to the defective pixel Pixel 23 are (106, 187, 133), and the initial gray level corresponding to the defective sub-pixel (B sub-pixel 23) is 255. The target gray level values determined according to steps S901 - S903 are 150 and 168 respectively. Then, replace the gray level value 106 to be displayed with the target gray level value 150, and replace the gray level value 187 to be displayed with the target gray level value 168. That is, the gray level value transmitted to the defective pixel Pixel 23 is (150, 168, 133).

[0183] In one or more embodiments, during the process of traversing the values of m and n, it can be traversed one by one, or traversed according to a preset step size. The present invention does not impose any restrictions on this.

[0184] Exemplarily, the preset step size is an empirical value and can be flexibly set according to actual business requirements. The embodiments of the present invention do not impose any restrictions on this. For example, if the preset step size is 10, then the gray level values are taken as: 10, 20, 30...

[0185] Traversing according to the preset step size to obtain the minimum value of the target color difference function can improve the calculation speed and the processing efficiency of the display device.

[0186] Compensate for the color cast phenomenon caused by defective sub-pixels based on the minimum color difference method, that is, construct a target color difference function based on the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value obtained by converting multiple gray-scale values to be displayed, and the initial gray-scale value corresponding to the defective sub-pixel, and determine the target gray-scale value according to the target color difference function. After updating the gray-scale values to be displayed of other sub-pixels with the target gray-scale value, the color difference between the actual displayed chromaticity and the target displayed chromaticity of the defective pixel is minimized, achieving the purpose of compensating for the color cast phenomenon caused by defective sub-pixels and improving the display effect of the display device.

[0187] In an alternative embodiment, when it is determined that the defect type of the defective sub-pixel is the first defect type and the gray-scale value to be displayed corresponding to the defective sub-pixel is the minimum gray-scale value, or when it is determined that the defect type of the defective sub-pixel is the second defect type and the gray-scale value to be displayed corresponding to the defective sub-pixel is not the minimum gray-scale value, the determination of the target gray-scale value is implemented based on the minimum perceptible brightness method, specifically:

[0188] The processor 120 is specifically configured to perform the following operations:

[0189] Based on the first correspondence relationship, and according to the color category of the defective sub-pixel and the initial gray-scale value corresponding to the defective sub-pixel, determine the target gray-scale value;

[0190] Wherein, the first correspondence relationship is used to represent the correspondence relationship between the colors and gray-scale values of multiple sub-pixels in a pixel, and the first correspondence relationship is determined based on the Helmholtz-Kohlausch Effect (H-K effect).

[0191] Wherein, the definition of the H-K effect is: the change in the perceived brightness of a color that occurs by increasing the purity of the color stimulus while keeping the brightness constant within the photopic range.

[0192] According to the H-K effect, under the condition of the same physical brightness, the human eye's perceived brightness of light of different colors is different. For example, when the physical brightness of the three primary colors of light is the same, the blue light perceived by the human eye is brighter than the red light, and the red light is brighter than the green light.

[0193] In one or more embodiments, if there is a defective sub-pixel that appears to be constantly on, based on the H-K effect, by adjusting the brightness of other sub-pixels in the defective pixel, the color purity of the defective sub-pixel is reduced to reduce the brightness perception of the defective sub-pixel in the human eye.

[0194] In one or more embodiments, if there is a defective sub-pixel that appears constantly dark, based on the H-K effect, by adjusting the brightness of other sub-pixels in the defective pixel, the color purity of the defective sub-pixel is increased to improve the brightness perception of the defective sub-pixel in the human eye.

[0195] It should be noted that a set of gray-scale values corresponding to a pixel uniquely corresponds to a visual result.

[0196] As Figure 11 shown, are different visual results corresponding to pixels with different gray-scale values. By Figure 11 it can be known that the defective sub-pixel is a blue (B) sub-pixel, and the initial gray-scale value of the blue sub-pixel is 255.

[0197] Combining (a1) and (a2), it can be known that when increasing the red (R) component for the defective sub-pixel, the visual effect presented by the defective pixel changes, and with different degrees of the increased red component, the perceived brightness of the defective pixel is also different. Among them, the perceived brightness of the pixel with the gray-scale value (R64, G0, B255) is significantly higher than that of the pixel with the gray-scale value (R128, G0, B255).

[0198] Combining (a1), (b1) and (c1), it can be known that when increasing different color components for the defective sub-pixel, the visual effects presented by the defective pixel are also different. Among them, the visual effects of the pixel with the gray-scale value (R64, G0, B255), the pixel with the gray-scale value (R0, G128, B255), and the pixel with the gray-scale value (R128, G128, B255) are all different.

[0199] It should be noted that when there are fewer other color components added to the defective sub-pixel that appears constantly bright, the visual effect of the pixel tends to the color of the defective sub-pixel; as the other color components gradually increase, the perceived brightness of the pixel gradually decreases; when more other color components are added, the perceived brightness of the pixel gradually increases again, and the visual effect of the pixel presents a mixed-color effect.

[0200] In one or more embodiments, based on the minimum perceived brightness method of the H-K effect, multiple combinations of gray-scale values with lower visual perceived brightness are selected, and a first correspondence is constructed according to the selected multiple combinations of gray-scale values. Among them, Table 1 is an example of a first correspondence:

[0201] defective sub-pixel other sub-pixel 1 other sub-pixel 2 R255 G128 B128 R128 G64 B64 R0 G0 B0 G288 R128 B128 G128 R64 B64 G0 R0 B0 B255 R128 G128 B128 R64 G64 B0 R0 G0

[0202] Table 1

[0203] It should be noted that Table 1 is only an example and should not cause any limitation to the embodiments of the present invention.

[0204] Exemplarily, assume that the defective sub-pixel is a blue (B) sub-pixel, and the initial gray level value of the defective sub-pixel is 255. Then, according to Table 1, the target gray level value of the red sub-pixel is 128, and the gray level value of the blue sub-pixel is 128.

[0205] Based on the minimum perceptible brightness method of the Helmholtz-Kohlrausch effect, the color cast phenomenon caused by the defective sub-pixel is compensated. That is, the first correspondence is determined through the Helmholtz-Kohlrausch effect, and according to the color category and the initial gray level value of the defective sub-pixel, a search is performed in the first correspondence to determine the target gray level value. After updating the gray level values to be displayed of other sub-pixels with the target gray level value, the actual perceptibility of the defective pixel by the user is reduced, thereby reducing the actual perceptibility of the color cast phenomenon caused by the defective sub-pixel by the user, improving the user experience, and improving the display effect of the display device.

[0206] In an alternative embodiment, the processor 120 is specifically configured to perform the following operations:

[0207] When it is determined that the defect type of the defective sub-pixel is the second defect type, the minimum gray level value is used as the target gray level value.

[0208] In one or more embodiments, when it is determined that the defect type of the defective sub-pixel is the second defect type, and the gray level value to be displayed corresponding to the defective sub-pixel is not the minimum gray level value, the minimum gray level value can also be used as the target gray level value.

[0209] In one or more embodiments, when it is determined that the defect type of the defective sub-pixel is the second defect type, and the gray level value to be displayed corresponding to the defective sub-pixel is the minimum gray level value, the minimum gray level value can be used as the target gray level value.

[0210] In one or more embodiments, when it is determined that the defect type of the defective sub-pixel is the second defect type, and the defective sub-pixel does not participate in the display, the minimum gray level value can be used as the target gray level value.

[0211] In a specific implementation, if the defective sub-pixel appears as a dark spot, the gray level values to be displayed of other sub-pixels are all updated to 0, so that the defective pixel appears as a black dot on the display panel, reducing the presence of the defective pixel.

[0212] When the defective sub-pixel appears in a dark spot state, the gray level values to be displayed of other sub-pixels except the defective sub-pixel in the defective pixel are updated to the minimum gray level value, so that the defective pixel appears as a black dot, reducing the perceptibility of the defective pixel in the eyes of the user and improving the user experience.

[0213] Step S403: Update the gray scale values to be displayed corresponding to other sub-pixels based on at least one target gray scale value, where the other sub-pixels are the sub-pixels other than the defective sub-pixel among the defective pixels.

[0214] In one or more embodiments, replace the gray scale values to be displayed corresponding to other sub-pixels with the target gray scale value to reduce the perceptibility of the defective pixels in the human eye.

[0215] Exemplarily, assume that the gray scale value to be displayed corresponding to the defective pixel Pixel 23 is (106, 187, 133), and the initial gray scale value corresponding to the defective sub-pixel (sub-pixel B 23) is 255;

[0216] And assume that the target gray scale values determined through step S402 are 150 and 168 respectively. Then, replace the gray scale value to be displayed 106 with the target gray scale value 150, and replace the gray scale value to be displayed 187 with the target gray scale value 168, that is, control the actual gray scale value of the defective pixel Pixel23y to be (150, 168, 133).

[0217] In one or more embodiments, within the current display cycle, if one or more adjacent pixels of the defective pixel do not participate in the display, the visual effect of the adjacent pixels can be adjusted to reduce the perceptibility of the defective pixel in the user's eyes.

[0218] The display panel 110 is used to display the image to be displayed after the gray scale values to be displayed corresponding to the defective pixels are updated.

[0219] In the display device provided by the embodiments of the present invention, the target gray scale value is determined through the defect type, the initial gray scale value, and the gray scale value to be displayed of the defective sub-pixel, and the gray scale values to be displayed of the other sub-pixels except the defective sub-pixel in the defective pixel are updated according to the target gray scale value, so as to compensate for the display color cast problem caused by the defective sub-pixel, reduce the perceptibility of the defective sub-pixel in the human eye, and improve the display effect of the display device.

[0220] Figure 12 The following shows a schematic diagram of the complete working process of a display device 100 provided by the embodiments of the present invention, including the following steps:

[0221] Step S1201: The processor 120 determines the defect type of the defective sub-pixel and the initial gray scale value corresponding to the defective sub-pixel;

[0222] Step S1202: The processor 120 determines the gray scale difference between the initial gray scale value corresponding to the defective sub-pixel and the gray scale value to be displayed corresponding to the defective sub-pixel;

[0223] Step S1203: The processor 120 determines whether the ratio of the grayscale difference to the total grayscale range is less than a preset ratio threshold. If so, step S1204 is executed; otherwise, step S1205, or step S1207, or step S1208, or step S1210 is executed;

[0224] Step S1204: The processor 120 keeps the multiple grayscale values to be displayed corresponding to the defective pixel unchanged;

[0225] Step S1205: The processor 120 determines that the defect type of the defective sub-pixel is the first defect type, and the grayscale value to be displayed corresponding to the defective sub-pixel is not the minimum grayscale value;

[0226] Step S1206: The processor 120 determines at least one target grayscale value based on the minimum color difference method;

[0227] Step S1207: The processor 120 determines that the defect type of the defective sub-pixel is the first defect type, and the grayscale value to be displayed corresponding to the defective sub-pixel is the minimum grayscale value;

[0228] Step S1208: The processor 120 determines that the defect type of the defective sub-pixel is the second defect type, and the grayscale value to be displayed corresponding to the defective sub-pixel is not the minimum grayscale value;

[0229] Step S1209: The processor 120 determines at least one target grayscale value based on the minimum perceived brightness method;

[0230] Step S1210: The processor 120 determines that the defect type of the defective sub-pixel is the second defect type, and the grayscale value to be displayed corresponding to the defective sub-pixel is the minimum grayscale value;

[0231] Step S1211: The processor 120 uses the minimum grayscale value as the target grayscale value;

[0232] Step S1212: The processor 120 updates the grayscale values to be displayed corresponding to other sub-pixels based on at least one target grayscale value;

[0233] Step S1213: The processor 120 sends the grayscale values to be displayed to each pixel;

[0234] Step S1214: The display panel 110 displays the image to be displayed.

[0235] Based on the same concept, an embodiment of the present invention further provides a method for compensating defective pixels of a display device, which is applied to the display device provided in any of the above embodiments. Since this method is the method executed by the display device in the embodiment of the present invention, and the principle of solving problems by this method is similar to that of the display device, the implementation of this method can refer to the implementation of the display device, and the repeated parts will not be elaborated.

[0236] The above method includes the following steps:

[0237] Determine the defect type of the defective sub-pixel and the initial gray level value corresponding to the defective sub-pixel, where the defect type includes a first defect type for characterizing that the defective sub-pixel is constantly on, and a second defect type for characterizing that the defective sub-pixel is constantly off;

[0238] Determine at least one target gray level value according to the defect type of the defective sub-pixel, the initial gray level value corresponding to the defective sub-pixel, and the multiple gray levels to be displayed corresponding to the defective pixel, where the defective pixel is the pixel to which the defective sub-pixel belongs;

[0239] Update the gray levels to be displayed corresponding to other sub-pixels based on at least one target gray level value, where the other sub-pixels are the sub-pixels in the defective pixel except the defective sub-pixel;

[0240] After the multiple gray levels to be displayed corresponding to the defective pixel are updated, display the image to be displayed.

[0241] In an optional embodiment, determining at least one target gray level value according to the defect type of the defective sub-pixel, the initial gray level value corresponding to the defective sub-pixel, and the multiple gray levels to be displayed corresponding to the defective pixel includes:

[0242] When it is determined that the defect type of the defective sub-pixel is the first defect type and the gray level to be displayed corresponding to the defective sub-pixel is not the minimum gray level:

[0243] Determine the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value corresponding to the defective pixel according to the multiple gray levels to be displayed corresponding to the defective pixel;

[0244] Construct a target color difference function based on the initial gray level value, the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value corresponding to the defective sub-pixel;

[0245] Take the gray level value that minimizes the value of the target color difference function as the target gray level value.

[0246] In an optional embodiment, determining the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value corresponding to the defective pixel according to the multiple gray levels to be displayed corresponding to the defective pixel includes:

[0247] Perform a conversion process on the multiple gray levels to be displayed to obtain multiple stimulus values corresponding to the defective pixel, where the multiple gray levels to be displayed belong to the RGB color space and the multiple stimulus values belong to the CIE XYZ color space;

[0248] Obtain the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value belonging to the CIE LAB color space according to the multiple stimulus values.

[0249] In an alternative embodiment, determining at least one target gray level value according to the defect type of the defective sub-pixel, the initial gray level value corresponding to the defective sub-pixel, and the multiple gray level values to be displayed corresponding to the defective pixel includes:

[0250] When it is determined that the defect type of the defective sub-pixel is the first defect type and the gray level value to be displayed corresponding to the defective sub-pixel is the minimum gray level value, or

[0251] When it is determined that the defect type of the defective sub-pixel is the second defect type and the gray level value to be displayed corresponding to the defective sub-pixel is not the minimum gray level value:

[0252] Based on the first correspondence relationship, and according to the color category of the defective sub-pixel and the initial gray level value corresponding to the defective sub-pixel, determine the target gray level value;

[0253] Wherein, the first correspondence relationship is used to represent the correspondence relationship between the colors and gray level values of multiple sub-pixels in a pixel, and the first correspondence relationship is determined based on the Helmholtz-Kohlrausch effect.

[0254] In an alternative embodiment, determining at least one target gray level value according to the defect type of the defective sub-pixel, the initial gray level value corresponding to the defective sub-pixel, and the multiple gray level values to be displayed corresponding to the defective pixel includes:

[0255] When it is determined that the defect type of the defective sub-pixel is the second defect type, use the minimum gray level value as the target gray level value.

[0256] In an alternative embodiment, after determining the defect type of the defective sub-pixel and the initial gray level value corresponding to the defective sub-pixel, the method further includes:

[0257] Determine the gray level difference between the initial gray level value corresponding to the defective sub-pixel and the gray level value to be displayed corresponding to the defective sub-pixel;

[0258] If the ratio of the gray level difference to the total gray level range is greater than or equal to a preset ratio threshold, determine at least one target gray level value;

[0259] If the ratio of the gray level difference to the total gray level range is less than the preset ratio threshold, keep the multiple gray level values to be displayed corresponding to the defective pixel unchanged.

[0260] Based on the same concept, an embodiment of the present invention further provides a defective pixel compensation device for a display device. Since this device is the device in the method of the embodiment of the present invention, and the principle of this device to solve problems is similar to that of this method, the implementation of this device can refer to the implementation of the method, and the repeated parts will not be described again.

[0261] Such as Figure 13As shown, the above device includes the following modules:

[0262] A pixel information determination module 1301, configured to determine the defect type of a defective sub-pixel and the initial gray scale value corresponding to the defective sub-pixel, where the defect type includes a first defect type for characterizing that the defective sub-pixel is always on and a second defect type for characterizing that the defective sub-pixel is always off;

[0263] A gray scale value determination module 1302, configured to determine at least one target gray scale value according to the defect type of the defective sub-pixel, the initial gray scale value corresponding to the defective sub-pixel, and the multiple gray scale values to be displayed corresponding to the defective pixel, where the defective pixel is the pixel to which the defective sub-pixel belongs;

[0264] A gray scale value adjustment module 1303, configured to update the gray scale values to be displayed corresponding to other sub-pixels based on at least one target gray scale value, where the other sub-pixels are the sub-pixels in the defective pixel except the defective sub-pixel;

[0265] An image display module 1304, configured to display the image to be displayed after the multiple gray scale values to be displayed corresponding to the defective pixel are updated.

[0266] Based on the same concept, an embodiment of the present invention further provides an electronic device. Since this electronic device is the electronic device in the method of the embodiment of the present invention and the principle of this electronic device for solving problems is similar to that of the method, the implementation of this electronic device can refer to the implementation of the method, and the repeated parts will not be described again.

[0267] The electronic device may be presented in the form of a general computing device. For example, it may be a terminal device. The components of the electronic device may include but are not limited to: the above at least one processor, the above at least one memory for storing instructions executable by the processor, and the processor is the processor of the intelligent device.

[0268] The processor realizes the following steps by running the executable instructions:

[0269] Determine the defect type of the defective sub-pixel and the initial gray scale value corresponding to the defective sub-pixel, where the defect type includes a first defect type for characterizing that the defective sub-pixel is always on and a second defect type for characterizing that the defective sub-pixel is always off;

[0270] Determine at least one target gray scale value according to the defect type of the defective sub-pixel, the initial gray scale value corresponding to the defective sub-pixel, and the multiple gray scale values to be displayed corresponding to the defective pixel, where the defective pixel is the pixel to which the defective sub-pixel belongs;

[0271] Update the gray scale values to be displayed corresponding to other sub-pixels based on at least one target gray scale value, where the other sub-pixels are the sub-pixels in the defective pixel except the defective sub-pixel;

[0272] After updating the multiple gray levels to be displayed corresponding to the defective pixel, display the image to be displayed.

[0273] In some possible implementation manners, each aspect of the present invention may also be implemented in the form of a program product, which includes program code. When the program product runs on a terminal device, the program code is used to cause the terminal device to execute the steps of each module in the defective pixel compensation device of the display device according to various exemplary embodiments of the present disclosure described in the above "Exemplary Method" section of this specification.

[0274] For example, determine the defective type of the defective sub-pixel and the initial gray level corresponding to the defective sub-pixel, where the defective type includes a first defective type for characterizing that the defective sub-pixel is always on and a second defective type for characterizing that the defective sub-pixel is always off; determine at least one target gray level according to the defective type of the defective sub-pixel, the initial gray level corresponding to the defective sub-pixel, and the multiple gray levels to be displayed corresponding to the defective pixel, where the defective pixel is the pixel to which the defective sub-pixel belongs; update the gray levels to be displayed corresponding to other sub-pixels based on at least one target gray level, where the other sub-pixels are the sub-pixels other than the defective sub-pixel in the defective pixel; after updating the multiple gray levels to be displayed corresponding to the defective pixel, display the image to be displayed.

[0275] The present application is described above with reference to the block diagrams and / or flowcharts showing methods, apparatuses (systems) and / or computer program products according to embodiments of the present application. It should be understood that one block of the block diagrams and / or flowcharts and combinations of blocks in the block diagrams and / or flowcharts can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, and / or other programmable data processing devices to generate a machine, so that the instructions executed by the computer processor and / or other programmable data processing devices create a method for implementing the functions / actions specified in the blocks of the block diagrams and / or flowcharts.

[0276] Correspondingly, the present application can also be implemented by hardware and / or software (including firmware, resident software, microcode, etc.). Further, the present application can take the form of a computer program product on a computer-usable or computer-readable storage medium, which has computer-usable or computer-readable program code implemented in the medium for use by or in connection with an instruction execution system. In the context of the present application, the computer-usable or computer-readable medium can be any medium that can contain, store, communicate, transmit, or convey a program for use by or in connection with an instruction execution system, apparatus, or device.

[0277] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A display device, characterized in that, It includes a display panel and a processor. The display panel includes a pixel array composed of a plurality of pixels, and one pixel in the pixel array includes a plurality of sub-pixels, where: The processor is configured to perform the following operations: Determine the defect type of the defective sub-pixel and the initial gray level value corresponding to the defective sub-pixel, where the defect type includes a first defect type for characterizing that the defective sub-pixel is constantly on and a second defect type for characterizing that the defective sub-pixel is constantly off; Determine at least one target gray level value according to the defect type of the defective sub-pixel, the initial gray level value corresponding to the defective sub-pixel, and a plurality of gray levels to be displayed corresponding to the defective pixel, where the defective pixel is the pixel to which the defective sub-pixel belongs; Update the gray levels to be displayed corresponding to the other sub-pixels based on the at least one target gray level value, where the other sub-pixels are the sub-pixels in the defective pixel except the defective sub-pixel; The display panel is configured to display the image to be displayed after the plurality of gray levels to be displayed corresponding to the defective pixel are updated.

2. The display device according to claim 1, wherein Specifically, the processor is configured to perform the following operations: When it is determined that the defect type of the defective sub-pixel is the first defect type and the gray level to be displayed corresponding to the defective sub-pixel is not the minimum gray level: Determine the reference brightness value, the first reference chromaticity value, and the second reference chromaticity value corresponding to the defective pixel according to the plurality of gray levels to be displayed corresponding to the defective pixel; Construct a target color difference function based on the initial gray level value corresponding to the defective sub-pixel, the reference brightness value, the first reference chromaticity value, and the second reference chromaticity value; Take the gray level value that minimizes the value of the target color difference function as the target gray level value.

3. The display device according to claim 2, wherein Specifically, the processor is configured to perform the following operations: Perform a conversion process on the plurality of gray levels to be displayed to obtain a plurality of stimulus values corresponding to the defective pixel, where the plurality of gray levels to be displayed belong to the RGB color space and the plurality of stimulus values belong to the CIE XYZ color space; Obtain the reference brightness value, the first reference chromaticity value, and the second reference chromaticity value belonging to the CIE LAB color space according to the plurality of stimulus values.

4. The display device according to claim 1, wherein Specifically, the processor is configured to perform the following operations: When it is determined that the defect type of the defective sub-pixel is the first defect type and the gray level to be displayed corresponding to the defective sub-pixel is the minimum gray level, or When it is determined that the defect type of the defective sub-pixel is the second defect type and the gray level to be displayed corresponding to the defective sub-pixel is not the minimum gray level: Determine the target gray level value based on a first correspondence relationship and according to the color category of the defective sub-pixel and the initial gray level value corresponding to the defective sub-pixel; Wherein, the first correspondence relationship is used to characterize the correspondence relationship between the colors and gray level values of the plurality of sub-pixels in one pixel, and the first correspondence relationship is determined based on the Helmholtz-Kohlrausch effect.

5. The display device according to claim 1, characterized in that, Specifically, the processor is configured to perform the following operations: When it is determined that the defect type of the defective sub-pixel is the second defect type, take the minimum gray level value as the target gray level value.

6. The display device according to any one of claims 1 to 5, characterized in that The processor is further configured to perform the following operations: Determine the gray-scale difference between the initial gray-scale value corresponding to the defective sub-pixel and the gray-scale value to be displayed corresponding to the defective sub-pixel; If the ratio of the gray-scale difference to the total gray-scale range is greater than or equal to a preset ratio threshold, determine the at least one target gray-scale value; If the ratio of the gray-scale difference to the total gray-scale range is less than the preset ratio threshold, keep the multiple gray-scale values to be displayed corresponding to the defective pixel unchanged.

7. A method for compensating defective pixels of a display device, characterized in that, Applied to the display device according to any one of claims 1 to 6, the method includes: Determine the defect type of the defective sub-pixel and the initial gray-scale value corresponding to the defective sub-pixel, where the defect type includes a first defect type for characterizing that the defective sub-pixel is constantly on and a second defect type for characterizing that the defective sub-pixel is constantly off; Determine at least one target gray-scale value according to the defect type of the defective sub-pixel, the initial gray-scale value corresponding to the defective sub-pixel, and the multiple gray-scale values to be displayed corresponding to the defective pixel, where the defective pixel is the pixel to which the defective sub-pixel belongs; Based on the at least one target gray-scale value, update the gray-scale values to be displayed corresponding to other sub-pixels, where the other sub-pixels are the sub-pixels other than the defective sub-pixel in the defective pixel; After the multiple gray-scale values to be displayed corresponding to the defective pixel are updated, display the image to be displayed.

8. The method according to claim 7, wherein The determining at least one target gray-scale value according to the defect type of the defective sub-pixel, the initial gray-scale value corresponding to the defective sub-pixel, and the multiple gray-scale values to be displayed corresponding to the defective pixel includes: When it is determined that the defect type of the defective sub-pixel is the first defect type and the gray-scale value to be displayed corresponding to the defective sub-pixel is not the minimum gray-scale value: According to the multiple gray-scale values to be displayed corresponding to the defective pixel, determine the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value corresponding to the defective pixel; Based on the initial gray-scale value corresponding to the defective sub-pixel, the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value, construct a target color difference function; Take the gray-scale value that minimizes the value of the target color difference function as the target gray-scale value.

9. The method according to claim 8, wherein The determining the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value corresponding to the defective pixel according to the multiple gray-scale values to be displayed corresponding to the defective pixel includes: Perform a conversion process on the multiple gray-scale values to be displayed to obtain multiple stimulus values corresponding to the defective pixel, where the multiple gray-scale values to be displayed belong to the RGB color space and the multiple stimulus values belong to the CIE XYZ color space; According to the multiple stimulus values, obtain the reference lightness value, the first reference chromaticity value, and the second reference chromaticity value belonging to the CIE LAB color space.

10. The method according to claim 7, wherein The determining at least one target gray-scale value according to the defect type of the defective sub-pixel, the initial gray-scale value corresponding to the defective sub-pixel, and the multiple gray-scale values to be displayed corresponding to the defective pixel includes: When it is determined that the defect type of the defective sub-pixel is the first defect type and the gray level value to be displayed corresponding to the defective sub-pixel is the minimum gray level value, or When it is determined that the defect type of the defective sub-pixel is the second defect type and the gray level value to be displayed corresponding to the defective sub-pixel is not the minimum gray level value: Based on the first correspondence relationship, and according to the color category of the defective sub-pixel and the initial gray level value corresponding to the defective sub-pixel, determine the target gray level value; Wherein, the first correspondence relationship is used to characterize the correspondence relationship between the colors and gray level values of multiple sub-pixels in a pixel, and the first correspondence relationship is determined based on the Helmholtz-Kohlrausch effect.

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