CN115631734B - Display screen brightness compensation method and brightness compensation device - Google Patents
Display screen brightness compensation method and brightness compensation device Download PDFInfo
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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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/40—Image enhancement or restoration by the use of histogram techniques
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/90—Determination of colour characteristics
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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
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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
- G09G3/2003—Display of colours
-
- 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
- G09G3/2007—Display of intermediate tones
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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
- G09G3/2007—Display of intermediate tones
- G09G3/2074—Display of intermediate tones using sub-pixels
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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
Abstract
The invention discloses a display screen brightness compensation method and a brightness compensation device. The brightness compensation method of the display screen comprises the following steps: dividing an irregular area and a regular area in the irregular display screen; calculating the equivalent value of each pixel in the irregular area and the regular area, respectively carrying out histogram statistics on the equivalent value of each pixel in the irregular area and the regular area, selecting the same equivalent value interval in which the occurrence frequency of the equivalent value exceeds a preset frequency threshold, determining a target pixel according to the selected equivalent value interval, and calculating the compensation value of the target pixel; and carrying out brightness compensation on the target pixels in the irregular area according to the calculated compensation value. The display screen brightness compensation method provided by the invention can compensate the brightness of the irregular area in the irregular display screen and optimize the problem of brightness bias of the irregular area.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display screen brightness compensation method and a brightness compensation device.
Background
With the development of mobile phones, the ratio of the display area of the mobile phone screen and the extremely good display effect of the screen become the main stream of development, and in order to pursue the extremely good screen ratio, the mobile phone screen realizes a comprehensive screen by improving the screen ratio through designing the NOTCH area with various shapes on the premise of ensuring the impact bearing capability of the screen and reserving space for elements such as a camera, namely a common NOTCH display screen (also known as Liu Haibing, a V-shaped screen, an irregular screen, a special-shaped screen and the like) in the market.
Although the NOTCH design can effectively increase the screen duty ratio, due to the special-shaped design, as in the NOTCH display screen shown in fig. 1, the number of pixels in the row where the NOTCH area is located is relatively small, and the load of the NOTCH area is 0, so that the electrode resistance value corresponding to the irregular area on two sides of the display screen in the area, namely the R angle area, is also small, and therefore the screen display of the area is bright in a part under the same driving voltage, and the phenomenon of uneven brightness of the whole display screen occurs. Accordingly, there is a need to provide an improved solution to overcome the above technical problems in the prior art.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a display screen brightness compensation method and a brightness compensation device, which compensate the brightness of an irregular area in an irregular display screen and optimize the brightness bias of the irregular area.
The invention provides a display screen brightness compensation method, which comprises the following steps: dividing an irregular area and a regular area in the irregular display screen; calculating the equivalent value of each pixel in the irregular area and the regular area, respectively carrying out histogram statistics on the equivalent value of each pixel in the irregular area and the regular area, and selecting the same equivalent value interval in which the occurrence frequency of the equivalent value exceeds a preset frequency threshold; determining a target pixel according to the selected equivalent value interval, and calculating a compensation value of the target pixel; and carrying out brightness compensation on the target pixels in the irregular area according to the calculated compensation value.
Optionally, the dividing the irregular area and the regular area in the irregular display screen includes: defining two non-rectangular areas on two sides of an inward concave notch of the irregular display screen as irregular areas; and defining a rectangular screen area adjacent to the irregular area and the notch as a regular area.
Optionally, the calculating the equivalent value of each pixel in the irregular area and the regular area includes: determining an equivalent value calculation function of each pixel: w=f (R, G, B), where W is an equivalent value corresponding to each pixel, R, G, B is a gray scale value of each of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of each pixel, and F (R, G, B) is a preset calculation function of the equivalent value.
Optionally, the performing histogram statistics on the equivalent value of each pixel in the irregular area and the regular area includes dividing the equivalent values 0 to 255 into a plurality of continuous equivalent value intervals, and performing histogram statistics on the occurrence frequency of the equivalent value belonging to each equivalent value interval according to the calculated equivalent value result of each pixel in the irregular area and the regular area.
Optionally, the determining the target pixel according to the selected equivalent value interval includes: and according to the selected same equivalent value interval, determining the pixel corresponding to the equivalent value belonging to the equivalent value interval in the irregular area as a target pixel.
Optionally, the calculating the compensation value of the target pixel includes: and determining a representative value of the selected equivalent value interval, and performing interpolation calculation according to a preset pixel interval compensation table to obtain a compensation value of the target pixel.
Optionally, the determining the representative value of the selected equivalent value interval includes: and determining the endpoint value or the intermediate value of the selected equivalent value interval as the representative value.
Optionally, the calculation formula for performing interpolation calculation according to the preset pixel interval compensation table is:
C＝1+(W c －W l )/(W r －W l )*(C r －C l )，
wherein C is the compensation value of the target pixel, W c For the representative value of the selected equivalent value interval, W l Is W c Left end point value, W of belonging section in preset pixel section compensation table r Is W c The right endpoint value of the section belonging to the preset pixel section compensation table, C l For W in preset pixel interval compensation table l Corresponding compensation value, C r For W in preset pixel interval compensation table r Corresponding compensation values.
Optionally, the compensation value is an adjustment value or an adjustment ratio of a gray scale value of the target pixel, or an adjustment value of a gamma reference voltage of the driving circuit corresponding to the target pixel.
The invention also provides a display screen brightness compensation device, which comprises: the area selection module is used for dividing an irregular area and a regular area in the irregular display screen; the compensation value calculation module is used for calculating the equivalent value of each pixel in the irregular area and the regular area, respectively carrying out histogram statistics on the equivalent value of each pixel in the irregular area and the regular area, and selecting the same equivalent value interval in which the occurrence frequency of the equivalent value exceeds a preset frequency threshold; determining a target pixel according to the selected equivalent value interval, and calculating a compensation value of the target pixel; and the brightness compensation module is used for carrying out brightness compensation on the target pixels belonging to the irregular area according to the calculated compensation value.
According to the display screen brightness compensation method and the display screen brightness compensation device, the display screen is divided into the irregular area with obvious brightness and the normal regular area, the equivalent value calculation is carried out on each pixel in the regular area and the irregular area, the target pixel in the irregular area needing compensation is determined through histogram statistics on the equivalent value, the compensation value of the target pixel is calculated according to the preset pixel interval compensation table, the obviously brightness target pixel is compensated, and the phenomenon that the irregular area in the irregular display screen is obviously brightness is further optimized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an irregular display screen;
FIG. 2 is a statistical histogram of pixel equivalents of an irregular area divided on a display screen in one embodiment of the present invention;
FIG. 3 is a flowchart of a method for compensating brightness of an irregular screen according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a portion of a default pixel interval compensation representation according to one embodiment of the present invention;
fig. 5 is a schematic structural diagram of an embodiment of a brightness compensation device according to the present invention.
Detailed Description
The foregoing and other features, aspects, and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments, which proceeds with reference to the accompanying drawings. While the invention may be susceptible to further details of technical means and effects for achieving the desired purpose, there is shown in the drawings a form a further part hereof, and in which is shown by way of illustration and not by way of limitation, certain well-known elements of the invention. For purposes of clarity, the various elements in the drawings are not necessarily drawn to scale. .
FIG. 3 is a flowchart of a method for compensating brightness of an irregular display according to an embodiment of the present invention;
step S11: dividing an irregular area and a regular area in the irregular display screen;
specifically, as shown in the schematic structural diagram of the irregular display screen in fig. 1, the irregular area in the embodiment of the present invention is a non-rectangular area on both sides of the portion of the display screen that is recessed inwards, i.e. the R-corner area shown in fig. 1. The regular area is a rectangular screen area adjacent to the irregular area and the notch, that is, the area a shown in fig. 1, and the size of the area a may be selected according to a specific experimental result, which is not limited in this embodiment.
Step S12: the method comprises the steps of carrying out a first treatment on the surface of the Calculating the equivalent value of each pixel in the irregular area and the regular area;
in particular, since the display panel is a pixel array, each pixel may include red, green, and blue sub-pixels; it is therefore necessary to first determine the equivalent value calculation function of the pixel: w=f (R, G, B), where W is an equivalent value corresponding to each pixel, R, G, B is a gray scale value of each of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of each pixel, and F (R, G, B) is a calculation function of a preset equivalent value. In this embodiment, the equivalent value of each pixel is calculated by performing weighted average on the sub-pixels of the pixel, and then a preset equivalent value calculation formula is as follows: w=0.3×r+0.6×g+0.1×b, and in some other embodiments may be obtained by some other calculation.
Step S13: respectively carrying out histogram statistics on equivalent values of each pixel in the irregular area and the regular area;
specifically, according to the equivalent value range calculated by the equivalent value calculation method employed in the present embodiment, from 0 to 255, the equivalent values 0 to 255 are divided into a plurality of continuous equivalent value sections. For example, in this embodiment, 0 to 255 are divided into 32 bins, histogram statistics is performed on the frequency of occurrence of the equivalent value of each pixel in the irregular area and the regular area, the histogram statistics result of the equivalent value of each pixel in the irregular area (i.e., the R-angle area) is shown in fig. 2, the vertical axis of the histogram shown in fig. 2 is in each equivalent value bin, the horizontal axis is the divided equivalent value bin, and since the frequency of occurrence of the equivalent value belonging to the bin 250 to 255 in this embodiment is 0, the bin 250 to 255 in fig. 2 is not shown. Note that the total number of frequency additions in which equivalent values of all sections appear is the total number of all pixels in the irregular area and the regular area in the present embodiment.
Step S14: selecting the same equivalent value interval of which the occurrence frequency of the equivalent value exceeds a preset frequency threshold value;
specifically, the display screen brightness compensation method provided by the invention only corrects the gray scale values with relatively high occurrence frequency in the gray scale value set displayed by all pixels in the R angle area in one frame of image, so that a frequency threshold is required to be preset, the preset frequency threshold is an integer value meeting 0 or more, and the frequency threshold set in the embodiment is 100, and the intervals exceeding the preset threshold in the histogram shown in fig. 2 are interval 5 and interval 26.
It should be noted that, only when there are pixels with the same gray scale value in the R-angle region and the region a, it can be seen that the pixels are significantly brightened in the R-angle region, and therefore, an equivalent value interval exceeding the preset threshold value in the histogram corresponding to the R-angle region, that is, an interval identical to the interval 5 and/or the interval 26 is selected from intervals exceeding the preset threshold value in the statistical histogram of the regular region (that is, the region a). For example, in this embodiment, the same equivalent value interval exceeding the preset threshold in the R angle region and the region a is interval 5.
Step S15: determining a target pixel according to the selected equivalent value interval and calculating a compensation value of the target pixel;
specifically, a pixel corresponding to an equivalent value belonging to the selected equivalent value interval in the R-angle area, that is, belonging to the interval 5, is determined as a pixel that is significantly brighter in the R-angle area, and compensation value calculation is performed on the target pixel that is significantly brighter in the R-angle area.
Specifically, the representative value of the selected section is first determined, in this embodiment, the intermediate value of the selected section is selected as the representative value of the selected section, and the intermediate value 36 of the section 5 is exemplified as the representative value of the section 5, and in other embodiments, the endpoint value of the selected section may be selected as the representative value. Then, interpolation calculation is carried out according to a preset pixel interval compensation table, wherein the calculation formula is C=1+ (W) c －W l )/(W r －W l )*(C r －C l ) Wherein C is the compensation value of the target pixel, W c For the representative value of the selected equivalent value interval, W l Is W c Left end point value, W of belonging section in preset pixel section compensation table r Is W c The right endpoint value of the section belonging to the preset pixel section compensation table, C l For W in preset pixel interval compensation table l Corresponding compensation value, C r For W in preset pixel interval compensation table r Corresponding compensation values.
For example, according to the partially preset pixel interval compensation representation diagram shown in fig. 4, the compensation value of the target pixel corresponding to the interval 5 may be obtained as follows: c=1+ (36-32)/(64-32) x (2-1).
Step S16: performing brightness compensation on the target pixel area in the irregular area according to the calculated compensation value;
specifically, the calculated compensation value may be used as an adjustment value or an adjustment ratio of a pixel gray level value to increase the brightness of the target pixel in the R-angle region according to a specific compensation method, and in other embodiments, the calculated compensation value may also be used as an adjustment value of a gamma reference voltage of the target pixel to adjust a driving voltage of a driving circuit corresponding to the target pixel in the R-angle region, which is not described in detail in the embodiment of the present application.
The embodiment of the invention also provides a brightness compensation device. The device can be realized by software and/or hardware, can be integrated in equipment with brightness compensation function, and can perform brightness compensation on the irregular display screen by executing the brightness compensation method. Fig. 5 is a schematic structural diagram of an embodiment of a brightness compensation device according to the present invention. As shown in fig. 5, the brightness compensation device provided in this embodiment includes a region selection module 510, a compensation value calculation module 520 and a brightness compensation module 530. The area selection module 510 is configured to divide an irregular area and a regular area in the irregular display screen; the compensation value calculation module 520 is configured to calculate an equivalent value of each pixel in the irregular area and the regular area, perform histogram statistics on the equivalent value of each pixel in the irregular area and the regular area, and select an identical equivalent value interval in which the occurrence frequency of the equivalent value exceeds a preset frequency threshold; determining a target pixel according to the selected equivalent value interval, and calculating a compensation value of the target pixel; and a brightness compensation module 530, configured to perform brightness compensation on the target pixels belonging to the irregular area according to the calculated compensation value.
In summary, according to the brightness compensation method and the brightness compensation device for the irregular screen provided by the embodiments of the present invention, by calculating the equivalent value of each pixel in the irregular area where the apparent brightness appears and the selected regular area, and performing histogram statistics on the equivalent value, determining the target pixel in the irregular area to be compensated through the histogram, calculating the compensation value of the target pixel according to the preset pixel interval compensation table, and compensating the apparent brightness of the target pixel according to the calculated compensation value, the phenomenon that the R angle area in the irregular display screen is apparent brightness is optimized.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.
Claims (9)
1. A display screen brightness compensation method, comprising:
dividing an irregular area and a regular area in the irregular display screen;
calculating the equivalent value of each pixel in the irregular area and the regular area, wherein the calculating function of the equivalent value of each pixel is as follows: w=0.3×r+0.6×g+0.1×b, where W is an equivalent value corresponding to each pixel, and R, G, and B are gray scale values of red sub-pixels, green sub-pixels, and blue sub-pixels of each pixel respectively; respectively carrying out histogram statistics on the equivalent value of each pixel in the irregular area and the regular area, and selecting the same equivalent value interval in which the occurrence frequency of the equivalent value exceeds a preset frequency threshold value;
determining a target pixel according to the selected equivalent value interval, and calculating a compensation value of the target pixel;
and carrying out brightness compensation on the target pixels in the irregular area according to the calculated compensation value.
2. The display screen brightness compensation method of claim 1, wherein the dividing the irregular area and the regular area in the irregular display screen comprises:
defining two non-rectangular areas on two sides of an inward concave notch of the irregular display screen as irregular areas; and defining a rectangular screen area adjacent to the irregular area and the notch as a regular area.
3. The method of claim 2, wherein the performing histogram statistics on the equivalent values of the pixels in the irregular area and the regular area includes dividing the equivalent values 0 to 255 into a plurality of continuous equivalent value intervals, and performing histogram statistics on the occurrence frequency of the equivalent value belonging to each equivalent value interval according to the calculated equivalent value results of the pixels in the irregular area and the regular area, respectively.
4. A display screen brightness compensation method according to claim 3 wherein said determining a target pixel from the selected equivalent value interval comprises: and according to the selected same equivalent value interval, determining the pixel corresponding to the equivalent value belonging to the equivalent value interval in the irregular area as a target pixel.
5. The display screen brightness compensation method of claim 4 wherein the calculating the compensation value of the target pixel comprises: and determining a representative value of the selected equivalent value interval, and performing interpolation calculation according to a preset pixel interval compensation table to obtain a compensation value of the target pixel.
6. The display screen brightness compensation method of claim 5 wherein the determining representative values of the selected equivalent value intervals comprises: and determining the endpoint value or the intermediate value of the selected equivalent value interval as the representative value.
7. The method for compensating brightness of display screen according to claim 5, wherein the calculation formula for performing interpolation calculation according to the preset pixel interval compensation table is as follows:
C＝1+(Wc－Wl)/(Wr－Wl)*(Cr－Cl)，
wherein C is a compensation value of the target pixel, wc is a representative value of the selected equivalent value interval, wl is a left end point value of an interval to which Wc belongs in a preset pixel interval compensation table, wr is a right end point value of an interval to which Wc belongs in a preset pixel interval compensation table, cl is a compensation value corresponding to Wl in the preset pixel interval compensation table, and Cr is a compensation value corresponding to Wr in the preset pixel interval compensation table.
8. The method of claim 7, wherein the compensation value is an adjustment value or an adjustment ratio of a gray scale value of the target pixel or an adjustment value of a gamma reference voltage of a driving circuit corresponding to the target pixel.
9. A display screen brightness compensation device, comprising:
the area selection module is used for dividing an irregular area and a regular area in the irregular display screen;
the compensation value calculation module is used for calculating the equivalent value of each pixel in the irregular area and the regular area, and the calculation function of the equivalent value of each pixel is as follows: w=0.3×r+0.6×g+0.1×b, where W is an equivalent value corresponding to each pixel, and R, G, and B are gray scale values of red sub-pixels, green sub-pixels, and blue sub-pixels of each pixel respectively; respectively carrying out histogram statistics on the equivalent value of each pixel in the irregular area and the regular area, and selecting the same equivalent value interval in which the occurrence frequency of the equivalent value exceeds a preset frequency threshold value; determining a target pixel according to the selected equivalent value interval, and calculating a compensation value of the target pixel;
and the brightness compensation module is used for carrying out brightness compensation on the target pixels belonging to the irregular area according to the calculated compensation value.
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