CN116844485A

CN116844485A - Display screen voltage drop compensation method, device, equipment and storage medium

Info

Publication number: CN116844485A
Application number: CN202310914619.2A
Authority: CN
Inventors: 周昱
Original assignee: Chip Wealth Technology Ltd
Current assignee: Chip Wealth Technology Ltd
Priority date: 2023-07-24
Filing date: 2023-07-24
Publication date: 2023-10-03

Abstract

The application provides a display screen voltage drop compensation method, a device, equipment and a storage medium, and relates to the technical field of driving display, wherein the method comprises the following steps: dividing sub-pixels in a display screen according to preset center distances to obtain a plurality of key sub-blocks and a plurality of distance equivalent compensation blocks; traversing the plurality of distance equivalent compensation blocks according to a preset center distance based on gray scale compensation values at the center positions of the key blocks to obtain a gray scale compensation value curve of each distance equivalent compensation block; performing traversal compensation on all sub-pixels in each distance equivalent compensation block based on a pixel-compensation value mapping table of the key block and a gray-scale compensation value curve of each distance equivalent compensation block; the number of compensation values to be stored is reduced, the capacity of a register required by the DDIC is saved, interpolation operation is simplified, and brightness deviation caused by in-plane wiring voltage drop is eliminated.

Description

Display screen voltage drop compensation method, device, equipment and storage medium

Technical Field

The application relates to the technical field of driving display, in particular to a display screen voltage drop compensation method, a device, equipment and a storage medium.

Background

In the AMOLED panel, the subpixels are uniformly distributed on the panel from top to bottom, and the subpixels on the panel are connected to the ELVDD voltage line through metal lines. The metal lines themselves contain resistors, which voltage-dividing reduces the ELVDD voltage actually reaching the sub-pixels, resulting in a decrease in brightness when the sub-pixels emit light. Therefore, when a solid-color picture is displayed, the luminance of the sub-pixel far from the IC terminal is lowered due to the difference in the partial pressure of the metal lines of the sub-pixels on the upper and lower sides of the panel.

At present, in order to solve the IR drop phenomenon of a solid-color picture, the existing in-plane IR drop compensation mode aims at compensating each input sub-pixel, and since the IR drop degrees at different positions under the same gray level are different, each sub-pixel needs to perform two-dimensional interpolation operation based on the position where the sub-pixel is located, the operation amount of the mode is complex, and the circuit area in the design is larger. Meanwhile, the existing in-plane IR drop compensation method needs to store the compensation results of all key gray scale points of each sub-area under the R/G/B/W (r=red red, g=green green, b=hole blue, w=white) picture, so that the storage capacity of the DDIC needs to be larger.

Disclosure of Invention

In view of the above, an object of the embodiments of the present application is to provide a display screen voltage compensation method, apparatus, device and storage medium, which is to divide sub-pixels with a relatively close distance in a display screen into a small block (i.e. a distance equivalent compensation block sub-block), consider that physical positions of all sub-pixels in the block are the same, and simplify the operation of interpolating a position of each sub-pixel in the prior art into a position operation of each small block; by establishing a pixel-compensation value two-dimensional mapping table to perform in-plane IR drop compensation on a non-white pure-color picture (R/G/B pure-color picture), the number of compensation values required to be stored is greatly reduced, and the capacity of a register required by a DDIC is saved; the brightness compensation of R/G/B/W pictures displayed under the same gray level is realized, and the brightness deviation caused by the in-plane wiring loading effect is eliminated, so that the technical problem is solved.

In a first aspect, an embodiment of the present application provides a display screen voltage drop compensation method, where the method includes: dividing sub-pixels in a display screen according to preset center distances to obtain a plurality of key sub-blocks and a plurality of distance equivalent compensation blocks; wherein the distance equivalent compensation block is located within the critical partition, and the physical locations of the sub-pixels within the distance equivalent compensation block are determined to be the same; traversing the plurality of distance equivalent compensation blocks according to the preset center distance based on the gray scale compensation value at the center position of the key sub-block to obtain a gray scale compensation value curve of each distance equivalent compensation block; performing traversal compensation on all sub-pixels in each distance equivalent compensation block based on a pixel-compensation value mapping table of the key block and a gray-scale compensation value curve of the distance equivalent compensation block; wherein the pixel-to-compensation value map includes: and the gray level compensation values of all the sub-pixels in the key subarea correspond to each other under the non-white pure color picture.

In the implementation process, the sub-pixels with the closer distance in the display screen are divided into a small block, and the physical positions of all the sub-pixels in the block are considered to be the same, so that the interpolation operation for the position of each sub-pixel in the prior art is simplified into the position operation for each small block, the two-dimensional interpolation operation for each sub-pixel based on the position in the prior art can be simplified into simple addition operation, the number of linear interpolation times is reduced, the operation complexity is simplified, and the circuit design area can be greatly reduced; the built pixel-compensation value two-dimensional mapping table carries out in-plane IR drop compensation on the non-white pure-color picture (R/G/B pure-color picture), so that the number of compensation values required to be stored is greatly reduced, the capacity of a register required by a DDIC is saved, the brightness of the R/G/B/W picture displayed under the same gray level is compensated to be the same, the brightness deviation caused by the in-plane wiring voltage drop effect is eliminated, and a good compensation effect is achieved.

Optionally, the method for constructing the pixel-compensation value mapping table of the key partition includes: calculating white image gray scale compensation values of a plurality of key gray scale points in the key sub-block under a white image, and constructing an in-plane white gray scale compensation curve of the key sub-block; calculating the gray scale compensation values of a solid color image surface of a plurality of key gray scale points in the key subarea under a non-white solid color image, and constructing an in-plane solid color gray scale compensation curve of the key subarea; and constructing a pixel-compensation value mapping table of the key subarea according to the mapping relation between the in-plane white gray-scale compensation curve and the in-plane pure gray-scale compensation curve.

In the implementation process, the in-plane IR drop compensation is carried out on the non-white pure-color picture by establishing the two-dimensional mapping table of the gray level-mapping value, so that compared with the prior art, the number of compensation values needing to be stored is greatly reduced, and the capacity of a register needed by the DDIC is saved.

Optionally, the calculating the white-picture gray-scale compensation values of the plurality of key gray-scale points in the key sub-block and constructing the in-plane white-scale compensation curve of the key sub-block under the white picture includes: in a white picture, carrying out brightness measurement on a plurality of key gray scale points in the key subarea to obtain brightness data of the plurality of key gray scale points; calculating actual gray scale values of the plurality of key gray scale points based on the brightness data of the plurality of key gray scale points and the brightness of key blocks in the central area of the display screen; determining the difference value between the actual gray scale value and the current gray scale values of the plurality of key gray scale points as a white image gray scale compensation value of the plurality of key gray scale points; and establishing a functional relation between each key gray level point in the key subarea and the corresponding white image gray level compensation value to obtain an in-plane white gray level compensation curve of the key subarea.

In the implementation process, the compensation values of the plurality of key gray scale points under the white picture are calculated by taking the brightness of the key sub-blocks of the central area of the display screen as the target brightness, so that good compensation effect is ensured, and the compensation efficiency is improved.

Optionally, the calculating the gray-scale compensation value of the solid-color image surface of the plurality of key gray-scale points in the key sub-block under the non-white solid-color image, and constructing the in-plane solid-color gray-scale compensation curve of the key sub-block includes: in a non-white pure-color picture, carrying out brightness measurement on a plurality of key gray scale points in the key subarea to obtain brightness data of the plurality of key gray scale points; calculating actual gray scale values of the plurality of key gray scale points based on the brightness data of the plurality of key gray scale points and the brightness of key blocks in the central area of the display screen; determining the difference value between the actual gray scale value and the current gray scale values of the plurality of key gray scale points as a pure color picture gray scale compensation value of the plurality of key gray scale points; and establishing a functional relation between each key gray level point in the key subarea and the corresponding gray level compensation value of the pure color picture surface to obtain an in-plane pure color gray level compensation curve of the key subarea.

In the implementation process, the compensation values of the plurality of key gray scale points under the non-white pure color picture are calculated by taking the brightness of the key subarea blocks of the central area of the display screen as the target brightness, so that good compensation effect is ensured, and the compensation efficiency is improved.

Optionally, the performing traversal calculation on the plurality of distance equivalent compensation blocks according to the preset center distance based on the gray scale compensation value at the center position of the key sub-block to obtain a gray scale compensation value curve of each distance equivalent compensation block, including: according to the size relation between the key sub-blocks and the distance equivalent compensation blocks, calculating gray-scale compensation stepping values and corresponding stepping fine adjustment values of key gray-scale points between the adjacent key sub-blocks; determining the actual position of the current distance equivalent compensation block in the key sub-block according to the central position of the current distance equivalent compensation block; initializing a gray-scale compensation value and a gray-scale compensation stepping value of a key gray-scale point in the current distance equivalent compensation block if the actual position is judged to be positioned at each row of the initial position of the key sub-block; if the actual position is judged to be positioned at the key column position of the key sub-block, initializing a gray-scale compensation stepping value and a corresponding stepping fine adjustment value of a key gray-scale point in the current distance equivalent compensation block; repeating the steps to iterate the key gray scale points in each distance equivalent compensation block until a gray scale compensation value curve of each distance equivalent compensation block is obtained.

In the implementation process, whether the gray-scale compensation stepping value and the gray-scale compensation stepping fine adjustment value are initialized is judged according to the actual position of the distance equivalent compensation block, so that iteration of key gray-scale points in each distance equivalent compensation block is realized, the calculated amount is reduced, and the compensation efficiency is improved.

Optionally, if the actual position is determined to be located at the start position of each row of the key sub-block, initializing a gray-scale compensation value and a gray-scale compensation step value of a key gray-scale point in the current distance equivalent compensation block, including: and if the actual position is judged to be positioned at the starting position of each row of the key sub-block, obtaining a gray-scale compensation stepping value and a gray-scale compensation stepping fine adjustment value of the key gray-scale point in the current distance equivalent compensation block according to the gray-scale compensation value of the key gray-scale point in the key sub-block.

In the implementation process, how to initialize the gray-scale compensation stepping value is judged according to the actual position of the distance equivalent compensation block, so that iteration of key gray-scale points in each distance equivalent compensation block is realized, the calculated amount is reduced, and the compensation efficiency is improved.

Optionally, if it is determined that the actual position is located at the key column position of the key partition, initializing a gray-scale compensation value and a corresponding step fine adjustment value of a key gray-scale point in the current distance equivalent compensation block includes: and if the actual position is judged to be positioned at the key row position of the key sub-block, superposing the gray-scale compensation value of the previous distance equivalent compensation block with the step value according to the gray-scale compensation step value of the current key sub-block, and finely adjusting parameters according to the gray-scale compensation step value to obtain the gray-scale compensation value of the key gray-scale point in the current distance equivalent compensation block.

In the implementation process, the initialization of the gray-scale compensation stepping fine adjustment value is judged according to the actual position of the distance equivalent compensation block, so that the iteration of key gray-scale points in each distance equivalent compensation block is realized, the calculated amount is reduced, and the compensation efficiency is improved.

In a second aspect, an embodiment of the present application provides a display screen voltage drop compensation apparatus, including: the dividing compensation block module is used for dividing the sub-pixels in the display screen according to the preset center distance to obtain a plurality of key blocks and a plurality of distance equivalent compensation blocks; wherein the distance equivalent compensation block is located within the critical partition, and the physical locations of the sub-pixels within the distance equivalent compensation block are determined to be the same; the traversing compensation block module is used for carrying out traversing calculation on the plurality of distance equivalent compensation blocks according to the preset center distance based on the gray scale compensation value at the center position of the key sub-block to obtain a gray scale compensation value curve of each distance equivalent compensation block; the traversal compensation sub-pixel module is used for performing traversal compensation on all sub-pixels in each distance equivalent compensation block based on a pixel-compensation value mapping table of the key block and the gray level compensation value curve; wherein the pixel-to-compensation value map includes: and the gray level compensation values of all the sub-pixels in the key subarea correspond to each other under the non-white pure color picture.

In a third aspect, an embodiment of the present application further provides an electronic device, including: a processor, a memory storing machine-readable instructions executable by the processor, which when executed by the processor perform the steps of the method described above when the electronic device is run.

In a fourth aspect, embodiments of the present application provide a storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method described above.

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a flowchart of a display screen voltage compensation method according to an embodiment of the present application;

FIG. 2 is a block diagram of an in-plane IR drop compensation according to an embodiment of the application;

FIG. 3 is a schematic diagram of a functional module of a display screen voltage compensation device according to an embodiment of the present application;

fig. 4 is a block diagram of an electronic device provided with a display screen voltage compensation device according to an embodiment of the application.

Icon: 210-dividing a compensation block module; 220-traversing the compensation block module; 230-traversing the compensation sub-pixel module; 300-an electronic device; 311-memory; 312-a storage controller; 313-processor; 314-peripheral interface; 315-an input-output unit; 316-display unit.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

Before describing the embodiments of the present application, a brief description will be first made of the technical concept related to the present application.

IR drop level: i is the current, R is the resistance, the result is the voltage, and IR drop is the voltage drop.

LUT is known as look up table: the image is actually a mapping table of pixel gray values, which changes the pixel gray values actually sampled into other gray values corresponding to the pixel gray values through certain transformation such as threshold value, inversion, binarization, contrast adjustment, linear transformation and the like, thus playing a role in highlighting useful information of the image and enhancing the optical contrast of the image. What transformations are specifically performed in the LUT is defined by the software.

RGBW: (r=red, g=green, b=hole, w=white), the three primary colors are the basis of all colors, and a typical LCD screen is composed of numerous red, green, and blue sub-pixels, and the three primary colors are mixed to emit light to form a color picture. The RGBW pixel is to add one more sub-pixel besides the three sub-pixels of red, green and blue by using the PenTile RGBW technology, and the sub-pixel does not have any color filter, that is, the white sub-pixel exists to let the backlight pass through, so that the screen can display a picture with higher brightness with the same power. In the case of the same panel size, the ratio of the numbers of R, G and B sub-pixel in the RGBW architecture is reduced by about 1/2 compared to the Normal RGB architecture (Normal RGB architecture), and compared with the Normal RGB architecture panel, the RGBW panel architecture has an unavoidable architecture defect, namely: for pure R, pure G, pure B, etc., RGBW architecture panels have display defects with dark frames.

Gray scale data: a dot, i.e. a pixel, on the lcd screen that is visible to the naked eye is made up of three sub-pixels, red, green and blue (RGB), each of which the light source behind it can exhibit a different brightness level. While gray levels represent the level of the hierarchy of different brightness from darkest to brightest, the more intermediate levels, the finer the picture effect that can be presented. Taking 8bit panel as an example: can represent the power of 2 to the 8, which is equal to 256 brightness levels, and is called 256 gray levels. Each pixel on the LCD screen is composed of red, green and blue with different brightness levels, and finally different color points are formed. That is, the color change of each point on the screen is actually brought about by the gray-scale change of the three RGB sub-pixels constituting the point. Gray scale, in bit, then the relationship between the two is: the Bit is the smallest memory unit of the computer, and the value of the Bit is represented by 0 or 1, so that more bits can represent more complex image information. (1) Single-bit (Single-bit): a single bit image records each pixel-white or black-with only one bit of data. (2) 8-bit gray scale: the gray-scale gradation of 256 levels is presented for more accurately representing a general black-and-white photograph, and the gray-scale gradation of 256 levels is enough to truly present more gray-scale gradation than can be distinguished by naked eyes. (3) 24-bit color: the 24-bit color image is composed of three 8-bit color channels, which when combined produce 1667 combinations of ten thousand colors, with 24-bit colors also known as full color.

The inventor notices that the method for solving the IR drop phenomenon of the solid-color picture in the prior art is as follows: firstly, dividing a screen into N block areas { B1, B2, … Bn } with measurable brightness, measuring the brightness of a white display picture in the areas under the gray scale of a key point (such as 32/64/128/192/224 gray scale, etc.), and recording gray scale values and corresponding brightness values { Lv_ori_1, lv_ori_2, … Lv_ori_n }; then, adding different offset values (the offset can be positive or negative) to the input gray scale of each sub-pixel on the screen under the same gray scale picture, so that the brightness of the white picture at each position of { B1, B2, … Bn } is equal after the input gray scale is added with the offset; finally, the gray-scale compensation values { oft, oft2, … of } at all positions { B1, B2, … Bn } on the screen of the R/G/B/W solid-color picture under the gray scale of all key points are obtained according to the method, and are stored in the DDIC, and the stored compensation values are called for compensation when the DDIC executes algorithm operation. At present, the existing in-plane IR drop compensation mode aims at compensating each input sub-pixel, and because the IR drop degrees at different positions under the same gray level are different, each sub-pixel needs to perform two-dimensional interpolation operation based on the position of the sub-pixel, and the operation amount of the mode is complex, and the circuit area in design is large. Meanwhile, the existing in-plane IR drop compensation method needs to store the offset results of all key gray scale points of each sub-area under the R/G/B/W picture, so that the storage capacity of the DDIC needs to be larger. In view of the above, the embodiments of the present application provide a display screen voltage compensation method, apparatus, device and storage medium as described below.

Referring to fig. 1, fig. 1 is a flowchart of a display screen voltage compensation method according to an embodiment of the application. The embodiments of the present application will be explained in detail below. The method comprises the following steps: step 100, step 120 and step 140.

Step 100: dividing sub-pixels in a display screen according to preset center distances to obtain a plurality of key sub-blocks and a plurality of distance equivalent compensation blocks; the distance equivalent compensation blocks are positioned in the key subareas, and the physical positions of the sub-pixels in the distance equivalent compensation blocks are determined to be the same;

step 120: traversing the plurality of distance equivalent compensation blocks according to a preset center distance based on gray scale compensation values at the center positions of the key blocks to obtain a gray scale compensation value curve of each distance equivalent compensation block;

step 140: performing traversal compensation on all sub-pixels in each distance equivalent compensation block based on a pixel-compensation value mapping table of the key sub-block and a gray scale compensation value curve of the distance equivalent compensation block; wherein the pixel-compensation value map includes: and gray level compensation values corresponding to all the sub-pixels in the key subarea under the non-white pure color picture.

Illustratively, the key tiles may be: the method comprises the steps of uniformly dividing the display screen panel into a plurality of measurable brightness block areas according to fixed center-to-center distances, wherein a plurality of key point gray scales, such as 32/64/128/192/224 gray scales, exist in the block areas, the brightness of a white display picture in the areas under the key point gray scales can be measured, gray scale values and corresponding brightness values are recorded, different gray scale compensation values (offset or positive or negative) are added to the input gray scales of all sub-pixels on a screen under the same gray scale picture, and the brightness of the white picture at all positions is equal after the input gray scales are increased by the gray scale compensation values. The distance equivalent compensation block may be: the small block areas are also divided according to the distance for dividing the center distance of the key partition blocks and are positioned in the fixed areas inside the key partition blocks, namely, sub-pixels on the panel, which are closer in distance, are divided into a small block (recorded as sub-block), and the physical positions of all the sub-pixels in the block are considered to be the same. The gray scale compensation value curve may be: according to the gray-scale compensation value at the central position of the key subarea block, the calculated distance in the adjacent key subarea block is equal to the curve relation of the gray-scale compensation value variation formed by the step-by-step displacement of the compensation block in the row direction and the column direction according to the fixed central distance. The non-white solid color picture may be: pure color pictures such as red R, green G, or blue B. The key tiled pixel-to-compensation value map may be: the gray level compensation value of the gray level of a plurality of key points in the key subarea under a white picture and the gray level compensation value of the gray level under a red R, green G, blue B and other pure-color pictures are related to a two-dimensional comparison table of conversion mapping factors of the gray level compensation value and the gray level compensation value.

Optionally, as shown in fig. 2, the black rectangular frame line dividing area is a block (key block), a circle in each block represents a central position of the block, and a corresponding in-plane IR drop gray level compensation value is stored in the DDIC; the small black rectangular blocks within the rectangular frame line represent sub-blocks of p x q size. Before carrying out IR drop in-plane compensation on all the sub-pixels in the panel, firstly dividing the display panel into M brightness-adjustable region blocks with the same size, then carrying out sub-block division on the sub-pixels of the whole panel according to the fixed p-q size, and considering that the physical positions of all the sub-pixels in the sub-block are the same. According to gray-scale compensation values at the central positions of M blocks stored in the DDIC, respectively solving the step values of the gray-scale compensation values generated by sub-blocks shifted in the row direction and the column direction according to the p-q size; dividing all sub-pixels on a screen according to the sub-block size of p x q, traversing from left to right and from top to bottom, and solving gray scale compensation values of in-plane IR drop compensation for key gray scale points in each sub-block, so as to calculate a gray scale compensation value stepping curve (gray-offset curve) of each sub-block. After the gray-offset curve of the current sub-block is obtained, R/G/B sub-pixels in the current sub-block are traversed, and according to the gray-offset curve of the current sub-block and the R/G/B related mapping factor LUT table stored in the DDIC, the in-plane IR drop compensation values of all sub-pixels on the screen in the current picture are obtained.

Dividing sub-pixels with a relatively close distance in a display screen into a small block (namely a distance equivalent compensation block sub-block), and considering that the physical positions of all the sub-pixels in the block are the same, simplifying the interpolation operation aiming at the position of each sub-pixel in the prior art into the position operation aiming at each small block, simplifying the two-dimensional interpolation operation aiming at each sub-pixel based on the position in the prior art into simple addition operation, reducing the times of linear interpolation, simplifying the complexity of operation and greatly reducing the area of circuit design; the built pixel-compensation value two-dimensional mapping table carries out in-plane IR drop compensation on the non-white pure-color picture (R/G/B pure-color picture), so that the number of compensation values required to be stored is greatly reduced, the capacity of a register required by a DDIC is saved, the brightness of the R/G/B/W picture displayed under the same gray level is compensated to be the same, the brightness deviation caused by the in-plane wiring voltage drop effect is eliminated, and a good compensation effect is achieved.

In one embodiment, the method for constructing the pixel-compensation value mapping table of the key partition in step 140 may include: step 141, step 142 and step 143.

Step 141: calculating white image gray scale compensation values of a plurality of key gray scale points in the key sub-block under the white image, and constructing an in-plane white gray scale compensation curve of the key sub-block;

step 142: calculating the gray scale compensation value of a pure color picture of a plurality of key gray scale points in a key sub-block under a non-white pure color picture, and constructing an in-plane pure color gray scale compensation curve of the key sub-block;

step 143: and constructing a pixel-compensation value mapping table of the key subarea according to the mapping relation between the in-plane white gray-scale compensation curve and the in-plane pure gray-scale compensation curve.

For example, according to the gray-scale compensation curves of the IR drop of the N key gray-scale points in the plane under the white screen, the gray-scale compensation value offset_w of the IR drop in the plane of each corresponding key sub-block under the K gray-scale points is respectively calculated, and the in-plane white gray-scale compensation curve of the gray-scale point-offset_w can be obtained. Wherein, K can be larger than N, and can be different from N key gray scale values, and when K is larger than N, key points on the IR drop gray scale compensation curve can be reserved, and the compensation precision of the full gray scale range can be improved. Then, these gray-scale compensation values offset_w are stored in DDIC, and at the same time, respectively calculate the in-plane IR drop R/G/B gray-scale compensation curves of each block (key block) under the R/G/B100% display screen (non-white solid-color screen), and calculate the R/G/B gray-scale compensation values offset_r/G/B of the corresponding in-plane IR drop under the K gray-scale points, thereby obtaining the in-plane solid-color gray-scale compensation curves of the gray-scale points-offset_r/G/B. And then, according to the mapping relation between the offset_W and the offset_R/G/B, obtaining a mapping factor or a conversion factor gain value, constructing a two-dimensional LUT table of gray scale and gain value, namely a pixel-compensation value mapping table of the key block, and storing the gain values into the DDIC for subsequent use.

The gray-scale compensation value required by the R/G/B picture is calculated through the gray-scale compensation value under the white picture and the mapping relation LUT, the two-dimensional LUT of the gray-scale mapping value is established to carry out the IR drop compensation on the R/G/B solid-color picture in the plane, compared with the prior art, the quantity of the compensation values required to be stored is greatly reduced, and the capacity of a register required by the DDIC is saved.

In one embodiment, step 141 may include: step 1411, step 1412, step 1413, and step 1414.

Step 1411: in a white picture, carrying out brightness measurement on a plurality of key gray scale points in the key subarea to obtain brightness data of the plurality of key gray scale points;

step 1412: calculating actual gray scale values of the plurality of key gray scale points based on the brightness data of the plurality of key gray scale points and the brightness of the key subarea of the central area of the display screen;

step 1413: determining the difference value between the actual gray scale value and the current gray scale value of the plurality of key gray scale points as a white image gray scale compensation value of the plurality of key gray scale points;

step 1414: and establishing a functional relation between each key gray level point in the key sub-block and the corresponding white image gray level compensation value to obtain an in-plane white gray level compensation curve of the key sub-block.

Exemplary, first, the display panel is divided into M luminance-variable region blocks (key blocks) of the same size, respectivelyThe 100% white picture is lighted under N key gray scale points (for example, 32/64/128/192/224 gray scales and the like), and the brightness values of M blocks under N gray scales are respectively measured by a brightness measuring instrument. Then, according to the luminance data of the N key gray-scale points, a luminance-gray-scale relationship curve (y=x ^b ) And under each key gray level, taking the block brightness of the central area of the screen as the target brightness of the in-plane IR drop compensation, and calculating the actual gray level value of the target brightness in the current block by utilizing the brightness-gray level curve in each block. And finally, calculating the difference value between the key gray level and the actual gray level, so that an in-plane IR drop white gray level compensation value of the current block under the current key gray level can be obtained, and an in-plane IR drop white gray level compensation curve of the current block is constructed according to the N key gray levels and the corresponding white gray level compensation values of the white image.

By taking the brightness of the key blocks in the central area of the display screen as the target brightness, the compensation values of a plurality of key gray scale points under the white picture are calculated, so that good compensation effect is ensured, and the compensation efficiency is improved.

In one embodiment, step 142 may include: step 1421, step 1422, step 1423, and step 1424.

Step 1421: in a non-white pure-color picture, carrying out brightness measurement on a plurality of key gray scale points in the key subarea to obtain brightness data of the plurality of key gray scale points;

step 1422: calculating actual gray scale values of the plurality of key gray scale points based on the brightness data of the plurality of key gray scale points and the brightness of the key subarea of the central area of the display screen;

step 1423: determining the difference value between the actual gray scale value and the current gray scale value of the plurality of key gray scale points as a pure color picture gray scale compensation value of the plurality of key gray scale points;

step 1424: and establishing a functional relation between each key gray level point in the key subarea and the corresponding gray level compensation value of the pure color picture surface to obtain an in-plane pure color gray level compensation curve of the key subarea.

Exemplary, first, the display panel is divided into M luminance-variable region blocks (key blocks) of the same sizeThe 100% R/G/B solid-color picture (non-white solid-color picture) is lighted under N key gray-scale points (for example, 32/64/128/192/224 gray-scale points, etc.), and the brightness values of M blocks under N gray-scales are respectively measured by a brightness measuring instrument. Then, according to the luminance data of the N key gray-scale points, a luminance-gray-scale relationship curve (y=x ^b ) And under each key gray level, taking the block brightness of the central area of the screen as the target brightness of the in-plane IR drop compensation, and calculating the actual gray level value of the target brightness in the current block by utilizing the brightness-gray level curve in each block. And finally, calculating the difference value between the key gray level and the actual gray level to obtain an in-plane IR drop pure-color image gray level compensation value of the current block under the current key gray level, and constructing an in-plane IR drop pure-color gray level compensation curve of the current block according to the N key gray levels and the corresponding pure-color image gray level compensation values.

By taking the brightness of the key subarea of the central area of the display screen as the target brightness, the compensation values of a plurality of key gray scale points under the non-white pure color picture are calculated, so that good compensation effect is ensured, and compensation efficiency is improved.

In one embodiment, step 120 may include: step 121, step 122, step 123, step 124 and step 125.

Step 121: according to the size relation between the key sub-blocks and the distance equivalent compensation blocks, calculating gray-scale compensation stepping values and corresponding stepping fine adjustment values of key gray-scale points between the adjacent key sub-blocks;

step 122: determining the actual position of the current distance equivalent compensation block in the key sub-block according to the central position of the current distance equivalent compensation block;

Step 123: if the actual position is judged to be positioned at the initial position of each row of the key sub-block, initializing a gray-scale compensation value and a gray-scale compensation stepping value of a key gray-scale point in the current distance equivalent compensation block;

step 124: if the actual position is judged to be positioned at the key column position of the key sub-block, initializing a gray-scale compensation stepping value of a key gray-scale point in the current distance equivalent compensation block and a corresponding stepping fine adjustment value;

step 125: repeating the steps to iterate the key gray scale points in each distance equivalent compensation block until a gray scale compensation value curve of each distance equivalent compensation block is obtained.

Illustratively, the size relationship of the key tiles and the distance equivalent compensation blocks may be: and determining the dividing ratio of the key sub-blocks and the distance equivalent compensation blocks according to the sizes of the row and column pixels on the panel occupied by the key sub-blocks and the distance equivalent compensation blocks. If the proportion is an integer, the integer can be divided, the gray-scale compensation value representing the key gray-scale point in the current distance equivalent compensation block can be directly calculated according to the gray-scale compensation stepping value between the adjacent key sub-blocks, and fine adjustment is not needed; otherwise, fine tuning is required according to the step fine tuning value.

The offset step value (gray-scale compensation step value) and step scaling (gray-scale compensation step trimming value) parameters of the compensation block divided by sub-block (distance equivalent compensation block) are calculated according to the fixed pitch of the block (key block) partition, and can be expressed as:

Oft_Step(k)＝round((offset(k+1)-offset(k))/tt)；

Oft_StepDim_Cnt_total＝abs(offset(k+1)-offst(k)-Oft_Step(k)*tt)；

Wherein, tt is the size proportion relation of block and sub-block; the offset_stepdi_cnt_total is used to eliminate offset errors between two adjacent blocks after iteration by the offset_step. According to the central position of the current sub-block, determining the actual position of the current sub-block in M blocks, and determining four adjacent blocks: blk (h 1, w 1), blk (h 1, w 2), blk (h 2, w 1) and Blk (h 2, w 2); initializing the Offset values corresponding to K gray-scale key points of the current sub-block according to the fixed distance from the block to the left boundary if the current sub-block is positioned at the starting position of each line; initializing related variables required by step_dimming if the current compensation block sub-block is positioned at a key column position of a block partition; and iterating out compensation values offset_curblk of all K key gray scales of the corresponding current sub-block according to the position of the current sub-block, so as to obtain a gray scale compensation value stepping curve of the gray scale-offset_curblk. Traversing all sub-pixels in the current sub-block, taking out a gray level compensation value LUT table of a key block corresponding to R/G/B from the DDIC, superposing the gray level compensation value LUT table on an offset_curblk, and calculating an in-plane IR drop compensation value of all the sub-pixels by adopting a linear interpolation mode.

Optionally, in-plane IR drop compensation is performed on a certain AMOLED screen widely applied in the market according to the above manner, brightness consistency of 100% white screen display under three high gray scales is measured respectively, comparison results before and after compensation are shown in table 1, and it can be seen from comparison of the results before and after compensation that the brightness consistency of the screen is improved remarkably after compensation.

TABLE 1

By judging whether to initialize the gray-scale compensation stepping value and the gray-scale compensation stepping fine adjustment value according to the actual position of the distance equivalent compensation block, iteration of key gray-scale points in each distance equivalent compensation block is realized, calculated amount is reduced, and compensation efficiency is improved.

In one embodiment, step 122 may include: step 1221.

Step 1221: and if the actual position is judged to be positioned at the starting position of each row of the key sub-block, obtaining the gray-scale compensation value and the gray-scale compensation stepping value of the key gray-scale points in the current distance equivalent compensation block according to the gray-scale compensation value of the key gray-scale points in the key sub-block.

Illustratively, all sub-pixels on the screen are divided according to the sub-block (distance equivalent compensation block) size of p, traversing is carried out from left to right and from top to bottom, and the offset of the in-plane IR drop compensation of the key gray scale point is solved for each sub-block. Since the size proportion relation between the key partition blocks and the sub-blocks is fixed, the gray level compensation value change amount or step value when adjacent blocks are shifted according to the sub-blocks can be calculated and recorded as offset_step. Specifically: calculating compensation values LIR_offset_blk of N key gray scales of the current sub-block, and initializing step restriction related parameters according to the offset_stepdi_cnt_total if the current compensation block is judged to be at the key position of the block partition; and if the current compensation block is judged to be at the starting position of the block partition, obtaining a gray-scale compensation stepping value of the key gray-scale point in the current sub-block according to the gray-scale compensation value of the key gray-scale point in the block partition.

By judging how to initialize the gray-scale compensation stepping value according to the actual position of the distance equivalent compensation block, iteration of key gray-scale points in each distance equivalent compensation block is realized, the calculated amount is reduced, and the compensation efficiency is improved.

In one embodiment, step 123 may include: step 1231.

Step 1231: if the actual position is judged to be positioned at the key column position of the key sub-block, the gray-scale compensation value of the previous distance equivalent compensation block is overlapped with the step value according to the gray-scale compensation step value of the current key sub-block, and the gray-scale compensation value of the key gray-scale point in the current distance equivalent compensation block is obtained according to the gray-scale compensation step value fine tuning parameter.

Illustratively, a solution for fine tuning step, i.e. a step_fine-tuning of the gray-scale compensation step, is added to ensure that the IR drop compensation value at the block center position is error free after iteration in the above manner, while taking into account possible errors in iteration according to step. Meanwhile, the gray-scale compensation stepping fine adjustment value is synchronously obtained when the gray-scale stepping value between adjacent key partitions is obtained, and is used for finally solving the gray-scale compensation value. Specifically: calculating compensation values LIR_offset_blk of N key gray scales of the current sub-block, and initializing step restriction related parameters according to the offset_stepdi_cnt_total if the current compensation block is judged to be at the key position of the block partition; if the current compensation block is judged not to be located at the starting position of the block partition and to be located at the key column position of the block partition, the gray-scale compensation value of the key gray-scale point in the current sub-block is obtained after fine adjustment is carried out according to the gray-scale compensation value of the key gray-scale point in the block partition, namely, the gray-scale compensation stepping value of the previous sub-block is overlapped to the current sub-block, and the gray-scale compensation value of the key gray-scale point in the current sub-block is obtained.

By judging how to initialize the gray-scale compensation stepping fine adjustment value according to the actual position of the distance equivalent compensation block, iteration of key gray-scale points in each distance equivalent compensation block is realized, the calculated amount is reduced, and the compensation efficiency is improved.

Referring to fig. 3, fig. 3 is a schematic functional block diagram of a display screen voltage drop compensation device according to an embodiment of the present application, where the device includes: the partition compensation block module 210, the traversal compensation block module 220, and the traversal compensation sub-pixel module 230.

The division compensation block module 210 is configured to divide the sub-pixels in the display screen according to a preset center-to-center distance to obtain a plurality of key blocks and a plurality of distance equivalent compensation blocks; wherein the distance equivalent compensation block is located within the critical partition, and the physical locations of the sub-pixels within the distance equivalent compensation block are determined to be the same;

the traversal compensation block module 220 is configured to perform traversal calculation on the plurality of distance equivalent compensation blocks according to the preset center distance based on the gray-scale compensation value at the center position of the key sub-block, so as to obtain a gray-scale compensation value curve of each distance equivalent compensation block;

the traversal compensation sub-pixel module 230 is configured to perform traversal compensation on all sub-pixels in each distance equivalent compensation block based on the pixel-compensation value mapping table of the key block and the gray-scale compensation value curve of the distance equivalent compensation block; wherein the pixel-to-compensation value map includes: and the gray level compensation values of all the sub-pixels in the key subarea correspond to each other under the non-white pure color picture.

Alternatively, the traversal compensation sub-pixel module 230 can be configured to:

calculating white image gray scale compensation values of a plurality of key gray scale points in the key sub-block under a white image, and constructing an in-plane white gray scale compensation curve of the key sub-block;

calculating the gray scale compensation values of a solid color image surface of a plurality of key gray scale points in the key subarea under a non-white solid color image, and constructing an in-plane solid color gray scale compensation curve of the key subarea;

and constructing a pixel-compensation value mapping table of the key subarea according to the mapping relation between the in-plane white gray-scale compensation curve and the in-plane pure gray-scale compensation curve.

in a white picture, carrying out brightness measurement on a plurality of key gray scale points in the key subarea to obtain brightness data of the plurality of key gray scale points;

calculating actual gray scale values of the plurality of key gray scale points based on the brightness data of the plurality of key gray scale points and the brightness of key blocks in the central area of the display screen;

determining the difference value between the actual gray scale value and the current gray scale values of the plurality of key gray scale points as a white image gray scale compensation value of the plurality of key gray scale points;

And establishing a functional relation between each key gray level point in the key subarea and the corresponding white image gray level compensation value to obtain an in-plane white gray level compensation curve of the key subarea.

in a non-white pure-color picture, carrying out brightness measurement on a plurality of key gray scale points in the key subarea to obtain brightness data of the plurality of key gray scale points;

determining the difference value between the actual gray scale value and the current gray scale values of the plurality of key gray scale points as a pure color picture gray scale compensation value of the plurality of key gray scale points;

and establishing a functional relation between each key gray level point in the key subarea and the corresponding gray level compensation value of the pure color picture surface to obtain an in-plane pure color gray level compensation curve of the key subarea.

Alternatively, the traversal compensation block module 220 can be configured to:

according to the size relation between the key sub-blocks and the distance equivalent compensation blocks, calculating gray-scale compensation stepping values and corresponding stepping fine adjustment values of key gray-scale points between the adjacent key sub-blocks;

Determining the actual position of the current distance equivalent compensation block in the key sub-block according to the central position of the current distance equivalent compensation block;

initializing a gray-scale compensation value and a gray-scale compensation stepping value of a key gray-scale point in the current distance equivalent compensation block if the actual position is judged to be positioned at each row of the initial position of the key sub-block; if the actual position is judged to be positioned at the key column position of the key sub-block, initializing a gray-scale compensation stepping value and a corresponding stepping fine adjustment value of a key gray-scale point in the current distance equivalent compensation block;

repeating the steps to iterate the key gray scale points in each distance equivalent compensation block until a gray scale compensation value curve of each distance equivalent compensation block is obtained.

and if the actual position is judged to be positioned at the starting position of each row of the key sub-block, obtaining the gray-scale compensation value and the gray-scale compensation stepping value of the key gray-scale point in the current distance equivalent compensation block according to the gray-scale compensation value of the key gray-scale point in the key sub-block.

And if the actual position is judged to be positioned at the key row position of the key sub-block, superposing the gray-scale compensation value of the previous distance equivalent compensation block with the step value according to the gray-scale compensation step value of the current key sub-block, and finely adjusting parameters according to the gray-scale compensation step value to obtain the gray-scale compensation value of the key gray-scale point in the current distance equivalent compensation block. Referring to fig. 4, fig. 4 is a block schematic diagram of an electronic device. The electronic device 300 may include a memory 311, a memory controller 312, a processor 313, a peripheral interface 314, an input output unit 315, a display unit 316. It will be appreciated by those of ordinary skill in the art that the configuration shown in fig. 4 is merely illustrative and is not intended to limit the configuration of the electronic device 300. For example, electronic device 300 may also include more or fewer components than shown in FIG. 4, or have a different configuration than shown in FIG. 4.

The above-mentioned memory 311, memory controller 312, processor 313, peripheral interface 314, input/output unit 315, and display unit 316 are electrically connected directly or indirectly to each other to realize data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The processor 313 is used to execute executable modules stored in the memory.

The Memory 311 may be, but is not limited to, a random access Memory (Random Access Memory, RAM), a Read Only Memory (ROM), a programmable Read Only Memory (Programmable Read-Only Memory, PROM), an erasable Read Only Memory (Erasable Programmable Read-Only Memory, EPROM), an electrically erasable Read Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM), etc. The memory 311 is configured to store a program, and the processor 313 executes the program after receiving an execution instruction, and a method executed by the electronic device 300 defined by the process disclosed in any embodiment of the present application may be applied to the processor 313 or implemented by the processor 313.

The processor 313 may be an integrated circuit chip having signal processing capabilities. The processor 313 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also digital signal processors (digital signal processor, DSP for short), application specific integrated circuits (Application Specific Integrated Circuit, ASIC for short), field Programmable Gate Arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The peripheral interface 314 couples various input/output devices to the processor 313 and the memory 311. In some embodiments, the peripheral interface 314, the processor 313, and the memory controller 312 may be implemented in a single chip. In other examples, they may be implemented by separate chips.

The input/output unit 315 is used for providing input data to a user. The input/output unit 315 may be, but is not limited to, a mouse, a keyboard, and the like.

The display unit 316 provides an interactive interface (e.g., a user interface) between the electronic device 300 and a user for reference. In this embodiment, the display unit 316 may be a liquid crystal display or a touch display. The liquid crystal display or the touch display may display a process of executing the program by the processor.

The electronic device 300 in this embodiment may be used to perform each step in each method provided in the embodiment of the present application.

Furthermore, the embodiment of the application also provides a storage medium, and a computer program is stored on the storage medium, and the computer program executes the steps in the embodiment of the method when being executed by a processor.

The computer program product of the above method according to the embodiment of the present application includes a storage medium storing program codes, where the instructions included in the program codes may be used to execute the steps in the above method embodiment, and specifically, reference may be made to the above method embodiment, which is not repeated herein.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, and the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The functional modules in the embodiment of the application can be integrated together to form a single part, or each module can exist alone, or two or more modules can be integrated to form a single part.

It should be noted that the functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM) random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

In this document, 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.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for compensating for a voltage drop across a display screen, the method comprising:

dividing sub-pixels in a display screen according to preset center distances to obtain a plurality of key sub-blocks and a plurality of distance equivalent compensation blocks; wherein the distance equivalent compensation block is located within the critical partition, and the physical locations of the sub-pixels within the distance equivalent compensation block are determined to be the same;

traversing the plurality of distance equivalent compensation blocks according to the preset center distance based on the gray scale compensation value at the center position of the key sub-block to obtain a gray scale compensation value curve of each distance equivalent compensation block;

performing traversal compensation on all sub-pixels in each distance equivalent compensation block based on a pixel-compensation value mapping table of the key block and a gray-scale compensation value curve of the distance equivalent compensation block; wherein the pixel-to-compensation value map includes: and the gray level compensation values of all the sub-pixels in the key subarea correspond to each other under the non-white pure color picture.

2. The method of claim 1, wherein the method for constructing the pixel-to-compensation value mapping table of the key block comprises:

3. The method of claim 2, wherein calculating white-picture gray-scale compensation values for a plurality of key gray-scale points within the key sub-block and constructing an in-plane white-scale compensation curve for the key sub-block under a white picture comprises:

4. The method of claim 2, wherein calculating the solid gray scale compensation values for the plurality of key gray scale points in the key sub-block and constructing the in-plane solid gray scale compensation curve for the key sub-block in the non-white solid color picture comprises:

5. The method according to claim 1, wherein the traversing calculation is performed on the plurality of distance equivalent compensation blocks according to the preset center-to-center distance based on the gray-scale compensation value at the center position of the key sub-block, to obtain a gray-scale compensation value curve of each of the distance equivalent compensation blocks, including:

initializing a gray-scale compensation value and a gray-scale compensation stepping value of a key gray-scale point in the current distance equivalent compensation block if the actual position is judged to be positioned at each row of the initial position of the key sub-block;

If the actual position is judged to be positioned at the key column position of the key sub-block, initializing a gray-scale compensation stepping value and a corresponding stepping fine adjustment value of a key gray-scale point in the current distance equivalent compensation block;

6. The method of claim 5, wherein initializing the gray-scale compensation value and the gray-scale compensation step value of the key gray-scale point in the current distance equivalent compensation block if the actual position is determined to be at the start position of each row of the key sub-block comprises:

7. The method of claim 5, wherein initializing a gray-scale compensation step value and a corresponding step-wise trim value for a key gray-scale point within the current distance equivalent compensation block if the actual position is determined to be at a key column position of the key sub-block comprises:

And if the actual position is judged to be positioned at the key row position of the key sub-block, superposing the gray-scale compensation value of the previous distance equivalent compensation block with the step value according to the gray-scale compensation step value of the current key sub-block, and finely adjusting parameters according to the gray-scale compensation step value to obtain the gray-scale compensation value of the key gray-scale point in the current distance equivalent compensation block.

8. A display screen voltage drop compensation device, the device comprising:

the dividing compensation block module is used for dividing the sub-pixels in the display screen according to the preset center distance to obtain a plurality of key blocks and a plurality of distance equivalent compensation blocks; wherein the distance equivalent compensation block is located within the critical partition, and the physical locations of the sub-pixels within the distance equivalent compensation block are determined to be the same;

the traversing compensation block module is used for carrying out traversing calculation on the plurality of distance equivalent compensation blocks according to the preset center distance based on the gray scale compensation value at the center position of the key sub-block to obtain a gray scale compensation value curve of each distance equivalent compensation block;

the traversal compensation sub-pixel module is used for performing traversal compensation on all sub-pixels in each distance equivalent compensation block based on a pixel-compensation value mapping table of the key block and a gray level compensation value curve of the distance equivalent compensation block; wherein the pixel-to-compensation value map includes: and the gray level compensation values of all the sub-pixels in the key subarea correspond to each other under the non-white pure color picture.

9. An electronic device, comprising: a processor, a memory storing machine-readable instructions executable by the processor, which when executed by the processor perform the steps of the method of any of claims 1 to 7 when the electronic device is run.

10. A storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method according to any of claims 1 to 7.