CN113763878B - Display compensation method and device of display screen and display device - Google Patents
Display compensation method and device of display screen and display device Download PDFInfo
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- CN113763878B CN113763878B CN202111060663.9A CN202111060663A CN113763878B CN 113763878 B CN113763878 B CN 113763878B CN 202111060663 A CN202111060663 A CN 202111060663A CN 113763878 B CN113763878 B CN 113763878B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
Abstract
The embodiment of the invention discloses a display compensation method and device of a display screen and a display device. In one embodiment, the method comprises: acquiring a first image of a display picture of a display screen under a set brightness level and a set gray scale, and performing gray scale difference operation on a reference image and the first image to obtain a third image; determining the maximum value of the difference value of each color channel gray scale data of each pixel point in a second display area of the corresponding display screen and a first display area in the third image as the gray scale compensation maximum value of each color channel in the second display area of the display screen, and establishing a linear corresponding relation according to the gray scale compensation maximum value and the maximum value of the service life compensation count value of the pixel point; and determining the gray scale compensation value of each color channel of each pixel point according to the current service life compensation count value and the linear corresponding relation of each pixel point in the second display area in the display process of the display screen, and performing display compensation according to the determined gray scale compensation value of each color channel of each pixel point.
Description
Technical Field
The invention relates to the technical field of display. And more particularly, to a display compensation method and device for a display screen and a display device.
Background
At present, due to the design defect of ITO wiring of a display area of a camera under a screen, colored vertical Mura can appear in the display area of the camera under the screen, the effect is not obvious when the current of high-brightness high-gray scale R/G/B is larger, the effect can be very obvious when the current of low-brightness low-gray scale R/G/B is smaller, the Gamma effect under low-brightness low-gray scale is seriously influenced, and the Gamma effect can not be well improved by utilizing external compensation.
Disclosure of Invention
The invention aims to provide a display compensation method, a compensation device and a display device of a display screen, so as to solve at least one of the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a display compensation method of a display screen in a first aspect, which comprises the following steps:
acquiring a first image of a display picture of a display screen under a set brightness level and a set gray scale obtained by image acquisition, and performing gray scale difference operation on a second image serving as a reference image and the first image to obtain a third image, wherein the display area of the display screen comprises a first display area and a second display area, and the second display area is an under-screen camera display area;
determining the maximum value of the difference value between the gray scale data of each color channel of each pixel point in the second display area of the corresponding display screen in the third image and the gray scale data of the corresponding color channel of the pixel point in the first display area of the corresponding display screen in the third image as the gray scale compensation maximum value of each color channel in the second display area of the display screen, and establishing the linear corresponding relation between the gray scale compensation value of each color channel of the pixel point in the second display area of the display screen and the service life compensation count value of the pixel point according to the gray scale compensation maximum value of each color channel in the second display area of the display screen;
and determining a gray scale compensation value of each color channel of each pixel point according to the current service life compensation count value of each pixel point in the second display area of the display screen in the display process and the linear corresponding relation, and performing display compensation according to the determined gray scale compensation value of each color channel of each pixel point.
According to the display compensation method of the display screen provided by the first aspect of the invention, the first image of the display picture of the display screen under the set brightness level and the set gray scale can be obtained; secondly, a second image serving as a reference image can be obtained, and gray-scale difference operation is carried out on the second image and the first image to obtain a third image, wherein the display area of the display screen comprises a first display area and a second display area, and the second display area is a display area of the camera under the screen; then determining the gray scale compensation maximum value of each color channel in the second display area of the display screen, and establishing the linear corresponding relation between the gray scale compensation value of each color channel of the pixel point in the second display area of the display screen and the service life compensation count value of the pixel point according to the gray scale compensation maximum value of each color channel in the second display area of the display screen; and finally, determining a gray scale compensation value of each color channel of each pixel point according to the current service life compensation count value and the linear corresponding relation of each pixel point in the second display area of the display screen in the display process, and performing display compensation according to the determined gray scale compensation value of each color channel of each pixel point.
Optionally, the establishing of the linear correspondence between the gray scale compensation value of each color channel of the pixel point in the second display region of the display screen and the life compensation count value of the pixel point by using the maximum gray scale compensation value of each color channel in the second display region of the display screen includes:
and the gray scale compensation maximum value of each color channel in the second display area of the display screen corresponds to the maximum value of the service life compensation count value of each pixel point in the second display area of the display screen, and the gray scale compensation zero value corresponds to the service life compensation count value zero value so as to establish the linear corresponding relation between the gray scale compensation value of each color channel of the pixel point in the second display area of the display screen and the service life compensation count value of the pixel point.
In this alternative way, a linear correspondence relationship between the gray scale compensation value of each color channel of the pixel point in the second display region of the display screen at the set brightness level and the set gray scale and the life compensation count value of the pixel point can be established.
Optionally, the step of enabling the maximum gray scale compensation value of each color channel in the second display area of the display screen to correspond to the maximum life compensation count value of each pixel in the second display area of the display screen, and enabling the gray scale compensation zero value to correspond to the life compensation count value zero value to establish a linear correspondence relationship between the gray scale compensation value of each color channel of the pixel in the second display area of the display screen and the life compensation count value of the pixel includes:
and the gray scale compensation maximum value of each color channel in the second display area of the display screen corresponds to the maximum value of the service life compensation count value of each pixel point in the second display area of the display screen, and the gray scale compensation zero value corresponds to the service life compensation count value zero value so as to establish the linear corresponding relation between the gray scale compensation value of each color channel of the pixel point in the second display area of the display screen and the service life compensation count value of the pixel point through linear interpolation.
By the optional mode, the gray scale compensation value corresponding to the life compensation count value of all the pixel points of each color channel in the second display area of the display screen under the set brightness level and the set gray scale can be obtained.
Optionally, the determining a gray scale compensation value of each color channel of each pixel according to the current life compensation count value of each pixel in the second display area of the display screen in the display process and the linear correspondence, and performing display compensation according to the determined gray scale compensation value of each color channel of each pixel includes:
determining a gray scale compensation value of each color channel of each pixel point according to the current service life compensation count value of each pixel point in a second display area of the display screen in the display process and the linear corresponding relation;
and modifying the determined gray scale compensation value of each color channel of each pixel point according to the brightness level correction coefficient and the gray scale correction coefficient, and performing display compensation according to the modified gray scale compensation value of each color channel of each pixel point, wherein the brightness level correction coefficient and the gray scale correction coefficient are determined according to the current brightness level and gray scale, the set brightness level and the set gray scale.
In the optional mode, the gray scale compensation value of each color channel of each pixel point is determined according to the current service life compensation count value of each pixel point in the second display area and the linear corresponding relation in the display process of the display screen under the set brightness level and the set gray scale, the determined gray scale compensation value of each color channel of each pixel point is modified according to the brightness level correction coefficient and the gray scale correction coefficient, and the display compensation is performed according to the modified gray scale compensation value of each color channel of each pixel point, namely, parameters which can be independently adjusted are provided for different brightness levels and different gray scales so as to ensure the compensation effect of the brightness and the chroma of the display screen under the screen camera display area under different brightness levels and different gray scales.
Optionally, the second image is generated according to gray scale data of a set pixel point in a first display region of the corresponding display screen in the first image.
Optionally, the set pixel point in the first display area of the display screen is a central pixel point of the first display area of the display screen.
Optionally, the set brightness level is the lowest brightness level of the display screen, and the set gray scale is 255.
The gray scale values of the pixel points of each color channel of the gray scale with the most serious color vertical Mura effect under the lowest brightness level in the display area of the lower screen camera of the display screen can be extracted one by one and compensated, so that the accurate adjustment and compensation of the lowest brightness level and the maximum chromaticity difference in the display area of the lower screen camera can be realized.
Optionally, the method further comprises: and storing the established linear corresponding relation in a lookup table LUT.
A second aspect of the invention provides a display compensation apparatus for a display screen, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method according to the first aspect of the invention when executing the program.
A third aspect of the invention provides a display device comprising a display screen and a display compensation device according to the second aspect of the invention.
The invention has the following beneficial effects:
according to the technical scheme, a first image of a display picture of a display screen under a set brightness level and a set gray scale can be obtained; secondly, a second image serving as a reference image can be obtained, and gray-scale difference operation is carried out on the second image and the first image to obtain a third image, wherein the display area of the display screen comprises a first display area and a second display area, and the second display area is a display area of the camera under the screen; then determining the gray scale compensation maximum value of each color channel in the second display area of the display screen, and establishing the linear corresponding relation between the gray scale compensation value of each color channel of the pixel point in the second display area of the display screen and the service life compensation count value of the pixel point according to the gray scale compensation maximum value of each color channel in the second display area of the display screen; and finally, determining a gray scale compensation value of each color channel of each pixel point according to the current service life compensation count value and the linear corresponding relation of each pixel point in the second display area of the display screen in the display process, and performing display compensation according to the determined gray scale compensation value of each color channel of each pixel point.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a display area of an off-screen camera showing a color vertical Mura in the prior art.
Fig. 2 shows a schematic diagram of ITO parasitic capacitance characteristics of a display area of an under-screen camera in the prior art.
Fig. 3 is a flowchart illustrating a display compensation method for a display screen according to an embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating an ideal compensated image in a display area of a 2nit Gray255 sub-screen camera according to an embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating a linear correspondence relationship between the lifetime compensation count values and the grayscale compensation values of all the pixels of the lookup table LUT1 in the red (R) channel according to an embodiment of the present invention.
FIG. 6 is a schematic diagram illustrating a relationship between gray levels and gray level compensation values at different brightness levels according to an embodiment of the present invention.
Fig. 7 shows a schematic diagram of the color vertical Mura of the camera display area under a 2nit 255Gray screen.
Fig. 8 is a schematic diagram illustrating an effect obtained by compensating the color vertical Mura of the camera display area of the display screen under the 2nit 255Gray screen by using the display compensation method for the display screen according to the embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to the following examples and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Camera display area under the current screen, for example the design defect of the ITO of camera display area walks the line under the screen of OLED screen leads to the colored vertical Mura to appear in camera display area under the screen, as shown in FIG. 1, the appearance of this effect can seriously influence the display effect in camera display area under the screen.
The design defects of the ITO wiring, such as different ITO lengths and different loads, and the parasitic capacitance between ITO layers is greatly different at different positions, fig. 2 shows an ITO capacitance characteristic diagram of a camera area under a screen, wherein the abscissa represents coordinate position parameters of a display screen, the unit is millimeter, and the 0 point of the abscissa represents the transverse middle position of an OLED screen; the vertical coordinate represents the relative size of the parasitic capacitance, the larger the parasitic capacitance is, the more serious the situation that the colorful vertical Mura appears in the display area of the camera under the screen is caused, and the display difference of the display area of the camera under the screen is caused, namely, the R/G/B sub-pixels have different luminous efficiencies and different currents, and the current size is I B >I R >I G 。
Due to the influence of parasitic capacitance, the G pixel (green sub-pixel) has a small current and charges slowly, so that the light emitting time is short. When the R/G/B current of high brightness and high gray scale is relatively large, the effect is not obvious; when the low-brightness low-gray-scale R/G/B current is relatively small, the effect is very serious, and the Gamma effect under the low-brightness low-gray-scale is influenced.
In view of this, an embodiment of the present invention provides a display compensation method for a display screen, and In particular, a debug-In optimization method for color vertical Mura of a display area of an off-screen camera, as shown In fig. 3, the display compensation method provided In this embodiment includes the following steps:
s1, acquiring a first image of a display screen under a set brightness level and a set gray scale obtained through image acquisition, and performing gray scale difference operation on a second image serving as a reference image and the first image to obtain a third image.
In one specific example, the display panel can be driven to display a white picture or a color picture under a set brightness level and a set gray scale, wherein each different brightness level can be arbitrarily set, such as 2nit, 6nit, 10nit, 14nit, and the like; gray levels of different sizes may be arbitrarily set, for example, 16Gray, 32Gray, 64Gray, 96Gray, 128Gray, 160Gray, 192Gray, 224Gray, 255Gray, and the like; specifically, the selection can be performed according to the serious condition of colorful vertical Mura in the area of the camera under the screen. In this embodiment, the brightness and the Gray scale of the area of the camera under the screen where the color vertical Mura is the most serious are selected, that is, the brightness level is 2nit, and the Gray scale is 255 Gray.
The display image of the whole display area of the display screen can be obtained by taking a picture of the whole display area of the display screen under 2nit 255Gray by an image acquisition device such as an industrial camera, wherein the industrial camera generally adopts a high-resolution and high-precision CCD or COMS camera, and the selection of the resolution of the camera depends on factors such as the resolution, the size, the shooting distance of the display screen of the acquired image, the setting precision of the display compensation and the like.
The red (R), green (G) and blue (B) Gray scale data at each position in the display screen of the entire display area of the display screen under 2nit 255Gray can be read by Matlab.
In this embodiment, the display area of the display screen includes a first display area and a second display area, and the second display area is a display area of the camera under the screen; the first display area is other display areas of the display screen except the display area of the camera under the screen. The first display area and the second display area respectively comprise a red display picture, a green display picture and a blue display picture under any set brightness level and any set gray scale.
In a possible implementation manner, the second image is generated according to gray scale data of a set pixel point in a first display area of the corresponding display screen in the first image.
In a preferred implementation manner, the set pixel point in the first display area of the display screen is a central pixel point of the first display area of the display screen.
In one specific example, gray scale data of center points of other display areas of the display screen except the display area of the camera under the screen is taken to generate a pure color reference image. Gray scale difference operation is performed on the generated Gray scale data of the pure-color reference image and the Gray scale data of the display picture of the whole display area of the display screen under 2nit 255Gray to obtain an ideal compensation image, as shown in fig. 4.
In one possible implementation manner, the set brightness level is the lowest brightness level of the display screen, and the set gray scale is 255. For example, in this embodiment, the brightness level is set to 2nit, and the Gray level is set to 255 Gray.
According to the implementation mode, the gray scale values of the pixel points of each color channel of the color gray scale of the color vertical Mura with the most serious occurrence under the lowest brightness level in the display area of the camera under the screen of the display screen can be extracted one by one and compensated, and the accurate adjustment and compensation of the lowest brightness level and the maximum chromaticity difference in the display area of the camera under the screen can be realized.
S2, determining the maximum value of the difference value between the gray scale data of each color channel of each pixel point in the second display area of the corresponding display screen in the third image and the gray scale data of the corresponding color channel of the pixel point in the first display area of the corresponding display screen in the third image as the gray scale compensation maximum value of each color channel in the second display area of the display screen, and establishing the linear corresponding relation between the gray scale compensation value of each color channel of the pixel point in the second display area of the display screen and the service life compensation count value of the pixel point according to the gray scale compensation maximum value of each color channel in the second display area of the display screen.
In a specific example, gray scale data of three channels including red (R), green (G) and blue (B) are respectively obtained for each color channel of each pixel point in the under-screen camera display area of the corresponding display screen in the ideal compensation image, gray scale data of corresponding red (R), green (G) and blue (B) channels of each pixel point in other display areas except the under-screen camera display area of the corresponding display screen in the ideal compensation image is obtained, the gray scale data of each color channel of each pixel point in the under-screen camera display area of the corresponding display screen in the ideal compensation image is differed with the gray scale data of corresponding channels of each pixel point in other display areas except the under-screen camera display area of the corresponding display screen in the ideal compensation image, and the maximum difference value of the gray scale data of each color channel is obtained, the gray scale compensation maximum values of red (R), green (G) and blue (B) channels in the display area of the camera under the screen are respectively used as the gray scale compensation maximum values of the display screen, namely, one gray scale compensation maximum value exists in each of the red (R), green (G) and blue (B) channels.
And establishing a linear corresponding relation between the gray scale compensation values of the red (R), green (G) and blue (B) channels of the pixel points in the display area of the screen of the display screen and the service life compensation count values of the red (R), green (G) and blue (B) channels of the pixel points in the display area of the screen of the display screen according to the gray scale compensation maximum values of the red (R), green (G) and blue (B) channels in the display area of the screen of the display screen.
In one possible implementation manner, the establishing of the linear correspondence relationship between the gray scale compensation value of each color channel of the pixel point in the display area of the lower screen camera of the display screen and the life compensation count value of the pixel point by using the maximum gray scale compensation value of each color channel in the display area of the lower screen camera of the display screen includes:
and corresponding the gray scale compensation maximum value of each color channel in the under-screen camera display area of the display screen to the maximum value of the service life compensation count value of each pixel point in the under-screen camera display area of the display screen, and corresponding the gray scale compensation zero value to the service life compensation count value zero value so as to establish the linear corresponding relation between the gray scale compensation value of each color channel of the pixel point in the second display area of the display screen and the service life compensation count value of the pixel point.
In a specific example, gray scale compensation values of red (R), green (G), and blue (B) channels in an under-screen camera display area of a display screen are linearly corresponding to life compensation count values of pixels of the red (R), green (G), and blue (B) channels in the under-screen camera display area of the display screen, in this embodiment, a gray scale compensation maximum value of each color channel in the under-screen camera display area of the display screen corresponds to a maximum value of life compensation count values of pixels in the under-screen camera display area of the display screen, a gray scale compensation zero value of each color channel in the under-screen camera display area of the display screen corresponds to a life compensation count value zero value of pixels in the under-screen camera display area of the display screen, and gray scale compensation values of the red (R), green (G), and blue (B) channels in the under-screen camera display area of the display screen correspond to linear correspondences of life compensation count values of pixels Is determined.
The service life compensation counting value is obtained by accumulating and calculating the aging degree of the display device according to the record of the pixel display information and the service life model of the display device, and then compensating the pixel brightness based on the aging degree, so that the pixel brightness is not influenced by the attenuation of the luminous efficiency of the display device. The display area of the display panel may be divided into a plurality of pixel areas, each pixel area may include a plurality of pixel units, for example, 8 × 8 pixel units may be divided into one pixel area, and each pixel area may include a plurality of sub-pixels. The life compensation count value can record the sum of aging values (life compensation count values) of each pixel region when the pixel region is used from the display screen through a data counting mode, so that An aging parameter A of each pixel region is obtained, wherein A is 0+ A1+ A2.
In a possible implementation manner, the step of corresponding the maximum gray scale compensation value of each color channel in the second display region of the display screen to the maximum value of the life compensation count value of each pixel in the second display region of the display screen and corresponding the gray scale compensation zero value to the life compensation count value zero value to establish the linear correspondence relationship between the gray scale compensation value of each color channel of the pixel in the second display region of the display screen and the life compensation count value of the pixel comprises:
and the gray scale compensation maximum value of each color channel in the second display area of the display screen corresponds to the maximum value of the service life compensation count value of each pixel point in the second display area of the display screen, and the gray scale compensation zero value corresponds to the service life compensation count value zero value so as to establish the linear corresponding relation between the gray scale compensation value of each color channel of the pixel point in the second display area of the display screen and the service life compensation count value of the pixel point through linear interpolation.
In a specific example, the range of the interval from the zero value to the maximum value of the life compensation count value is determined, the linear correspondence between the gray scale compensation value of each color channel of the pixel points in the second display area of the display screen and the life compensation count value of the pixel points is also established, linear interpolation is performed in the interval from 0 to the maximum value of the life compensation count value, the life compensation count value of each pixel point corresponding to the linear interpolation is brought into the linear correspondence, and the gray scale compensation value corresponding to the life compensation count value of each pixel point of each color channel in the second display area of the display screen under the set brightness level and the set gray scale is obtained.
By the implementation mode, the gray scale compensation value corresponding to the service life compensation count value of all the pixel points of each color channel in the second display area of the display screen under the set brightness level and the set gray scale can be obtained.
In one possible implementation, the method further includes: and storing the established linear corresponding relation in a lookup table LUT.
In the embodiment of the present invention, the steps S1 and S2 are pre-calibration stages, and in the pre-calibration stage, a look-up table LUT of all pixel points of each channel at a certain gray level of a certain brightness level is obtained by using linear interpolation. The red channel corresponds to one look-up table LUT1, the green channel corresponds to one look-up table LUT2, the blue channel corresponds to one look-up table LUT3, and the look-up tables LUT1, LUT2 and LUT3 are linear corresponding relations between life compensation count values and gray scale compensation values of all pixel points of the red (R), green (G) and blue (B) channels respectively. As shown in fig. 5, the look-up table LUT1 shows a linear correspondence relationship between the lifetime compensation count value and the grayscale compensation value of all pixel points of the red (R) channel of the display screen of the display panel with the luminance level of 2nit and the grayscale of 255Gray, where the abscissa α is the lifetime compensation count value and the ordinate β is the grayscale compensation value.
S3, determining the gray scale compensation value of each color channel of each pixel according to the current service life compensation count value of each pixel in the second display area of the display screen in the display process and the linear corresponding relation, and performing display compensation according to the determined gray scale compensation value of each color channel of each pixel.
In this embodiment of the present invention, step S3 is a compensation stage in actual use, and is a calculation method for recording a sum of aging values of each pixel region when the display screen starts to be used according to the life compensation count value through a data counting mode, obtaining a current life compensation count value of each pixel point in a display region of an off-screen camera in a display process of the display screen under 2nit 255Gray, determining a Gray scale compensation value of each color channel of each pixel point according to the current life compensation count value of each pixel point in the display region of the off-screen camera in the display process of the display screen under 2nit 255Gray and a linear correspondence, and performing display compensation according to the determined Gray scale compensation value of each color channel of each pixel point, where the calculation formula of the compensated Gray scale value is:
G out ＝G in +Offset (1)
wherein G is in The gray scale value to be compensated, Offset is a gray scale compensation value, the gray scale compensation value can be obtained by a look-up table LUT, a red channel LUT1, a green channel LUT2, a blue channel LUT3, and G out Is the compensated gray scale value.
In a possible implementation manner, the determining a gray scale compensation value of each color channel of each pixel according to the current life compensation count value of each pixel in the second display area of the display screen in the display process and the linear correspondence, and performing display compensation according to the determined gray scale compensation value of each color channel of each pixel includes:
determining a gray scale compensation value of each color channel of each pixel point according to the current service life compensation count value of each pixel point in a second display area of the display screen in the display process and the linear corresponding relation;
and modifying the determined gray scale compensation value of each color channel of each pixel point according to the brightness level correction coefficient and the gray scale correction coefficient, and performing display compensation according to the modified gray scale compensation value of each color channel of each pixel point, wherein the brightness level correction coefficient and the gray scale correction coefficient are determined according to the current brightness level and gray scale, the set brightness level and the set gray scale.
In a specific example, since the Mura of the under-screen camera area is different in degree under different brightness levels and different Gray scales, after the current life compensation count value and the linear corresponding relationship of each pixel point in the under-screen camera display area in the display process of the display screen under a certain brightness level and a certain Gray scale, for example, 2nit 255Gray in this embodiment, are obtained to determine the Gray scale compensation value of each color channel of each pixel point, brightness level correction and Gray scale correction need to be performed on the determined Gray scale compensation value of each color channel of each pixel point to obtain the modified Gray scale compensation value of each color channel of each pixel point, and display compensation is performed according to the modified Gray scale compensation value of each color channel of each pixel point, and the calculation formula of the compensated Gray scale value is:
G out ＝G in +Offset*DBV_Scaler*Gray_Scaler (2)
wherein G is in A gray scale value to be compensated; offset is a gray scale compensation value; DBV _ Scalar is a brightness grade correction coefficient and is used for correcting gray scale compensation values under different brightness grades; gray _ Scaler is a Gray scale correction coefficient and is used for correcting Gray scale compensation values under different Gray scales; g out Is the compensated gray scale value.
Fig. 6 is a diagram illustrating the relationship between Gray levels and Gray level compensation values at different brightness levels, where Gray level is plotted on the abscissa, Offset (Δ Gray) is plotted on the ordinate, ODS _1case is a curve relationship between the Gray level at the highest brightness level and the Gray level compensation value, ODS _2case is a curve relationship between the Gray level at the next highest brightness level and the Gray level compensation value, and ODS _ Ncase is a curve relationship between the Gray level at the darkest brightness level and the Gray level compensation value, and in this embodiment, ODS _ Ncase is a curve relationship between the Gray level at 2nit brightness level and the Gray level compensation value, for example. According to the curves shown in fig. 6, the brightness level correction coefficient DBV _ Scalar and the Gray level correction coefficient Gray _ Scaler can be obtained according to the variation rule between the Gray level compensation values corresponding to different brightness levels and different Gray levels.
For example, with respect to the ODS _ Ncase curve shown in fig. 6, it can be obtained in the following manner:
for example, in the embodiment, the maximum Gray-scale compensation value of each color channel of each pixel point of 2nit 255Gray is obtained in steps S1 to S2, the maximum Gray-scale compensation value of the remaining binding point Gray scales under the 2nit luminance level, for example, the maximum Gray-scale compensation values obtained in steps S1 to S2 on the display screen of 0Gray, 2Gray, 4Gray, 8Gray, 16Gray, 32Gray, 64Gray, and 128Gray in fig. 6, and then the maximum Gray-scale compensation values corresponding to two adjacent binding point Gray scales of 0Gray, 2Gray, 4Gray, 8Gray, 16Gray, 32Gray, 64Gray, 128Gray, and 256Gray under the 2nit luminance level are linearly interpolated to obtain the ODS _ Ncase curve.
The determination manner of other curves such as ODS _1case, ODS _2case, etc. may be determined by using a determination manner similar to the ODS _ Ncase curve described above, or may be obtained by mapping the ODS _ Ncase curve and a relational model of different luminance levels and Gray scales, for example, that different luminance levels may be obtained by mapping the relational model to a curve relationship corresponding to the Gray scale and Gray scale compensation value at other luminance levels with a preset luminance level and Gray scale (e.g., 2nit 255Gray scale) as a reference.
During compensation, terminal equipment such as a smart phone and the like to which the display screen belongs can determine the brightness level of the display screen and also can determine the gray scale under the current brightness level, the information is transmitted to a drive IC of the mobile phone, an LUT (look up table) is stored in a storage component of the drive IC, the drive IC searches for current gray scale compensation data, a brightness level correction coefficient and a gray scale correction coefficient according to the LUT, and then the gray scale value to be compensated can be obtained through calculation and is displayed and compensated based on the gray scale compensation data.
Before compensation, the color vertical Mura of the display area of the camera under the 2nit 255Gray screen is shown in FIG. 7, and the effect diagram obtained after the display compensation method of the display screen provided by the embodiment of the invention is used for compensating the color vertical Mura of the display area of the camera under the 2nit 255Gray screen is shown in FIG. 8.
The display compensation method of the display screen provided by the embodiment can firstly obtain a first image of a display picture of the display screen under a set brightness level and a set gray scale; secondly, a second image serving as a reference image can be obtained, and gray scale difference operation is carried out on the second image and the first image to obtain a third image, wherein the display area of the display screen comprises a first display area and a second display area, and the second display area is a display area of the camera under the screen; then determining the gray scale compensation maximum value of each color channel in the second display area of the display screen, and establishing the linear corresponding relation between the gray scale compensation value of each color channel of the pixel point in the second display area of the display screen and the service life compensation count value of the pixel point according to the gray scale compensation maximum value of each color channel in the second display area of the display screen; and finally, determining a gray scale compensation value of each color channel of each pixel point according to the current service life compensation count value and the linear corresponding relation of each pixel point in the second display area of the display screen in the display process, and performing display compensation according to the determined gray scale compensation value of each color channel of each pixel point.
Another embodiment of the present invention provides a display compensation apparatus for a display screen, including a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the display compensation method.
It should be noted that the principle and the working flow of the display compensation device of the display screen provided in this embodiment are similar to those of the display compensation method of the display screen, and reference may be made to the above description for relevant points, which are not described herein again.
Another embodiment of the present invention provides a display device, which includes a display screen and a display compensation device of the display screen. The display compensation device of the display screen may be any product or component having a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator, which is not limited in this embodiment.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is further noted that, in the description of the present invention, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations and modifications can be made on the basis of the above description, and all embodiments cannot be exhaustive, and all obvious variations and modifications belonging to the technical scheme of the present invention are within the protection scope of the present invention.
Claims (10)
1. A display compensation method of a display screen is characterized by comprising the following steps:
acquiring a first image of a display picture of a display screen under a set brightness level and a set gray scale obtained by image acquisition, and performing gray scale difference operation on a second image serving as a reference image and the first image to obtain a third image, wherein the display area of the display screen comprises a first display area and a second display area, and the second display area is an under-screen camera display area;
determining the maximum value of the difference value between the gray scale data of each color channel of each pixel point in the second display area of the corresponding display screen in the third image and the gray scale data of the corresponding color channel of the pixel point in the first display area of the corresponding display screen in the third image as the gray scale compensation maximum value of each color channel in the second display area of the display screen, and establishing the linear corresponding relation between the gray scale compensation value of each color channel of the pixel point in the second display area of the display screen and the service life compensation count value of the pixel point according to the gray scale compensation maximum value of each color channel in the second display area of the display screen;
and determining the gray scale compensation value of each color channel of each pixel point according to the current service life compensation count value of each pixel point in the second display area of the display screen in the display process and the linear corresponding relation, and performing display compensation according to the determined gray scale compensation value of each color channel of each pixel point.
2. The method of claim 1, wherein the establishing a linear correspondence between the maximum value of the gray scale compensation for each color channel in the second display region of the display screen and the gray scale compensation value for each color channel of the pixel in the second display region of the display screen and the lifetime compensation count value of the pixel comprises:
and the gray scale compensation maximum value of each color channel in the second display area of the display screen corresponds to the maximum value of the service life compensation count value of each pixel point in the second display area of the display screen, and the gray scale compensation zero value corresponds to the service life compensation count value zero value so as to establish the linear corresponding relation between the gray scale compensation value of each color channel of the pixel point in the second display area of the display screen and the service life compensation count value of the pixel point.
3. The method of claim 2, wherein the step of mapping the maximum gray scale compensation value of each color channel in the second display region of the display screen to the maximum life compensation count value of each pixel in the second display region of the display screen and mapping the zero gray scale compensation value to the zero life compensation count value to establish a linear mapping between the gray scale compensation value of each color channel of the pixels in the second display region of the display screen and the life compensation count value of the pixel comprises:
and the gray scale compensation maximum value of each color channel in the second display area of the display screen corresponds to the maximum value of the service life compensation count value of each pixel point in the second display area of the display screen, and the gray scale compensation zero value corresponds to the service life compensation count value zero value so as to establish the linear corresponding relation between the gray scale compensation value of each color channel of the pixel point in the second display area of the display screen and the service life compensation count value of the pixel point through linear interpolation.
4. The method of claim 1, wherein the determining the gray scale compensation value of each color channel of each pixel according to the current life compensation count value of each pixel in the second display region of the display screen during the display process and the linear correspondence, and the performing the display compensation according to the determined gray scale compensation value of each color channel of each pixel comprises:
determining a gray scale compensation value of each color channel of each pixel point according to the current service life compensation count value of each pixel point in a second display area of the display screen in the display process and the linear corresponding relation;
and modifying the determined gray scale compensation value of each color channel of each pixel point according to the brightness level correction coefficient and the gray scale correction coefficient, and performing display compensation according to the modified gray scale compensation value of each color channel of each pixel point, wherein the brightness level correction coefficient and the gray scale correction coefficient are determined according to the current brightness level and gray scale, the set brightness level and the set gray scale.
5. The method of claim 1, wherein the second image is generated according to gray scale data of a set pixel point in the first display region of the corresponding display screen in the first image.
6. The method of claim 5, wherein the set pixel point in the first display region of the display screen is a center pixel point of the first display region of the display screen.
7. The method of claim 1, wherein the set brightness level is a lowest brightness level of the display screen and the set gray scale is 255.
8. The method of claim 1, further comprising: and storing the established linear corresponding relation in a lookup table LUT.
9. A display compensation apparatus for a display screen, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the method of any one of claims 1 to 8.
10. A display device comprising a display screen and a display compensation device according to claim 9.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107408367A (en) * | 2015-03-20 | 2017-11-28 | 华为技术有限公司 | It is a kind of to correct display screen uneven method, apparatus and system |
| CN107665684A (en) * | 2017-10-13 | 2018-02-06 | 深圳吉迪思电子科技有限公司 | A kind of color Mura compensation methodes |
| CN110148388A (en) * | 2019-05-22 | 2019-08-20 | 京东方科技集团股份有限公司 | Determine method and apparatus, the electronic equipment, storage medium of pixel compensation value |
| CN110349537A (en) * | 2019-07-23 | 2019-10-18 | 云谷（固安）科技有限公司 | Show compensation method, device, computer equipment and storage medium |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107408367A (en) * | 2015-03-20 | 2017-11-28 | 华为技术有限公司 | It is a kind of to correct display screen uneven method, apparatus and system |
| CN107665684A (en) * | 2017-10-13 | 2018-02-06 | 深圳吉迪思电子科技有限公司 | A kind of color Mura compensation methodes |
| CN110148388A (en) * | 2019-05-22 | 2019-08-20 | 京东方科技集团股份有限公司 | Determine method and apparatus, the electronic equipment, storage medium of pixel compensation value |
| CN110349537A (en) * | 2019-07-23 | 2019-10-18 | 云谷（固安）科技有限公司 | Show compensation method, device, computer equipment and storage medium |
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