CN113674687A - Display driving method - Google Patents
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- CN113674687A CN113674687A CN202110944026.1A CN202110944026A CN113674687A CN 113674687 A CN113674687 A CN 113674687A CN 202110944026 A CN202110944026 A CN 202110944026A CN 113674687 A CN113674687 A CN 113674687A
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- 238000005070 sampling Methods 0.000 description 2
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The application discloses a display driving method, comprising: selecting a plurality of measurement points of the display area, the measurement points comprising one or more sub-pixels; acquiring actual brightness values of all the measuring points; obtaining a target brightness value of each measuring point according to the coordinate and the actual brightness value of each measuring point; acquiring a difference value between an actual brightness value and a target brightness value of each measuring point; taking the difference value as a brightness compensation value of each measuring point in the display area; and performing brightness compensation on the display area according to the brightness compensation value and displaying an image. This application can make display panel luminous more even, improves display panel's mura phenomenon, improves the display quality.
Description
Technical Field
The application relates to the technical field of display, in particular to a display driving method.
Background
In recent years, an OLED (Organic Light Emitting Diode) display panel has been gradually replacing a CRT (Cathode Ray Tube) display panel, and has become a mainstream product in the display panel market. The OLED display panel emits light, which is generally electroluminescence emitted by sub-pixels provided therein, and the degree of light emission is changed according to a change in pixel level inputted from a display driving chip (DDI). In the display process, the OLED display panel has nonuniform light emission due to IR drop (IR drop) in a driving circuit of the OLED display panel, and a mura phenomenon occurs to affect the display quality.
Disclosure of Invention
In view of the above technical problems, the present application provides a display driving method, which is beneficial to making the display panel emit light more uniformly, improving the mura phenomenon of the display panel, and improving the display quality.
An embodiment of the present application provides a display driving method for driving a display area to display an image, the display area having a plurality of sub-pixels, the display driving method including:
selecting a plurality of measurement points of the display area, the measurement points comprising one or more sub-pixels;
acquiring actual brightness values of all the measuring points;
obtaining a target brightness value of each measuring point according to the coordinate and the actual brightness value of each measuring point;
acquiring a difference value between an actual brightness value and a target brightness value of each measuring point;
taking the difference value as a brightness compensation value of each measuring point in the display area;
and performing brightness compensation on the display area according to the brightness compensation value and displaying an image.
Optionally, the plurality of measurement points are distributed on the display area row by row.
Optionally, the distances of adjacent measurement points in the row direction are equal or unequal; and/or the distances between adjacent measuring points in the column direction are equal or unequal.
Optionally, the acquiring the actual brightness of each measurement point includes: and acquiring the actual brightness value of a gray scale of each measuring point.
Optionally, the acquiring the actual brightness of each measurement point includes: and acquiring actual brightness values of at least two gray scales of each measuring point.
Optionally, the at least two gray levels include gray levels 32, 64, 96, 128, 192, and 255.
Optionally, the obtaining a target brightness value of each measurement point according to the coordinate and the actual brightness value of each measurement point includes one of:
inquiring according to a preset display lookup table to obtain a target brightness value of each measuring point, wherein the display lookup table records a one-to-one correspondence relationship between the brightness value and the coordinate;
or selecting the actual brightness value of one measuring point as the target brightness value of other measuring points;
or, selecting the average brightness value of a plurality of measurement points as the target brightness value.
Optionally, the obtaining a target brightness value of each measurement point according to the coordinate and the actual brightness value of each measurement point includes: and acquiring the actual brightness values of all gray scales of each measuring point by adopting an intermediate value insertion method.
Optionally, the obtaining a target brightness value of each measurement point according to the coordinate and the actual brightness value of each measurement point includes: and obtaining the actual brightness values of all gray scales of each measuring point by adopting an intermediate value interpolation method for the coordinates of each measuring point and adopting an intermediate value interpolation method for the actual brightness values of at least two gray scales of each measuring point.
Optionally, the brightness compensation values and the coordinates of the respective measurement points are stored in the SRAM of the display area in a one-to-one correspondence.
As described above, in the display driving method of the present application, a plurality of measurement points in a display area are selected, a difference value of each measurement point is obtained through an actual brightness value and a coordinate of each measurement point, and the difference value is used as a brightness compensation value of each measurement point, so that brightness compensation is performed on the display area when an image is displayed, and the brightness compensation value can be regarded as an influence of an IR drop in a driving circuit on brightness, so as to perform brightness compensation on the measurement points, so that the actual brightness value of each measurement point is closer to a target brightness value thereof, which is beneficial to making the display panel emit light more uniformly, improving the mura phenomenon of the display panel, and improving the display quality.
Drawings
FIG. 1 is a schematic flow chart illustrating a display driving method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a pixel structure of a display area according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a distribution of measurement points in a display area according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of the brightness at six gray levels for each measurement point shown in FIG. 3;
fig. 5 is a schematic diagram of an LUT according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described below in conjunction with specific embodiments and accompanying drawings. It is to be understood that the embodiments described below are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, the following respective embodiments and technical features thereof may be combined with each other without conflict.
Fig. 1 is a schematic flow chart of a display driving method according to an embodiment of the present application. The display driving method is used for driving a display area to display an image, as shown in fig. 2, taking OLED panel as an example, the display area 20 has a plurality of sub-pixels 21, and driving circuits of the sub-pixels 21 may be the same, and embodiments of the present application do not limit a specific structure of the driving circuit of the sub-pixels 21. The display driving method includes the following steps S11 to S16.
S11: a plurality of measurement points of the display area are selected, the measurement points comprising one or more sub-pixels.
In some embodiments, and with reference to FIG. 3, the measurement points are points identified by "+", and the plurality of measurement points are distributed on the display area 20 row by row. The display area 20 is divided into a plurality of columns according to the row direction, the display area 20 is divided into a plurality of rows according to the column direction, the intersection point of the rows and the columns is a measuring point, the abscissa of the measuring points is x1 and x2 … xn in sequence, the ordinate of the measuring points is y1 and y2 … yn in sequence, n is a positive integer greater than 2, the coordinates of the measuring points are not listed one by one, the coordinates of four measuring points adjacent to four vertices of the display area 20 are (x1, y1), (xn, y1), (x1, yn), (xn, yn), the coordinates of a measuring point located in the middle of the display area 20 are (xm, ym), and m is a positive integer greater than 2 and less than n, it should be understood that m may not be equal to n/2.
In some scenarios, the distances between adjacent measurement points may be equal or different along the row direction, and in addition, the distances between adjacent measurement points may be equal or different along the column direction; or, along the row direction, the distances between adjacent measuring points are equal, and along the column direction, the distances between adjacent measuring points are different; alternatively, the distance between adjacent measurement points is not equal in the row direction, and the distance between adjacent measurement points is equal in the column direction. The embodiments of the present application are not limited thereto.
The larger the number of the selected measuring points and the larger the distribution area on the display area 20, the more beneficial the sampling accuracy is, and the finer the brightness compensation on the display area 20 is.
Each measurement point may be a point of a single sub-pixel on the display area 20, or may be an area of adjacent sub-pixels on the display area 20, where the coordinate and the brightness value (including the actual brightness value and the target brightness value) of each measurement point are the coordinates of the point at the middle position of the area, and the brightness value of each measurement point may be the average brightness value of all sub-pixels in the area.
S12: and acquiring the actual brightness value of each measuring point.
In some embodiments, the actual brightness value of a gray scale of each measurement point is obtained.
In other embodiments, actual brightness values of at least two gray scales of each measurement point are obtained, for example, the at least two gray scales include six gray scales of 32, 64, 96, 128, 192 and 255, and as shown in fig. 4, actual brightness values of the measurement point (x1, y1) at the six gray scales of 32, 64, 96, 128, 192 and 255 are obtained for the measurement point (x1, y 1).
The gray scale range of the gray scale is 0-255, the actual brightness values of the measurement points are acquired only by adopting the gray scale of part of the gray scale, the more the range of the sampled gray scale is, the more the sampling accuracy is improved, and the finer the brightness compensation of the display area 20 is.
S13: and obtaining the target brightness value of each measuring point according to the coordinate and the actual brightness value of each measuring point.
Taking the actual luminance values of the six gray levels 32, 64, 96, 128, 192, and 255 for each measurement point as an example, the target luminance value for each measurement point can be obtained in the following manner.
Firstly, a target brightness value of each measuring point is obtained through query according to a preset display lookup table (LUT), and the display lookup table records a one-to-one correspondence relationship between the brightness value and the coordinate. That is, the theoretical luminance value at the coordinates of the measurement point is directly taken as the target luminance value.
And secondly, selecting the actual brightness value of one measuring point as the target brightness value of other measuring points. For example, the actual luminance values (of course, the theoretical luminance values) of the measurement points (xm, ym) located in the middle of the display area 20 may be set as the target luminance values of all the measurement points.
And thirdly, selecting the average brightness value of a plurality of measurement points as a target brightness value. For example, the average value of the actual luminance values (or theoretical luminance values) of all the measurement points is taken as the target luminance value of each measurement point.
S14: and acquiring the difference between the actual brightness value and the target brightness value of each measuring point.
S15: and taking the difference value as a brightness compensation value of each measuring point in the display area.
S16: and performing brightness compensation on the display area according to the brightness compensation value and displaying an image.
The embodiment of the application selects a plurality of measuring points of the display area 20, obtain the brightness difference value of each measuring point through the actual brightness value and the coordinate of each measuring point, and regard the brightness difference value as the brightness compensation value, carry out the brightness compensation to the display area 20 when showing the image, the brightness compensation value can be regarded as the influence of IR pressure drop to luminance in the drive circuit, carry out the brightness compensation to the measuring point in view of the above, make the actual brightness value of each measuring point all more close to its target brightness value, be favorable to making the luminous more even of display panel, improve the mura phenomenon of display panel, improve and show the quality. The display panel includes, but is not limited to, an OLED display panel.
It is to be understood that, in the step of S12, if the actual luminance values of the respective measurement points are for the respective gray scales, the difference values of the target luminance values and the subsequent steps and the luminance compensation are also based on those for the respective gray scales. For example, the actual luminance value, the target luminance value, the difference value, and the luminance compensation value obtained by the embodiment of the present application may not be equal for two gray scales of 32 and 255 gray scale values.
In some embodiments of step S13, the display driving method may use an intermediate value interpolation method to obtain actual luminance values of all gray levels of each measurement point. The median interpolation method is substantially an interpolation method, and the specific principle and process thereof are not described in detail, and is used for obtaining the actual brightness values of other gray scales from 0 to 255 of each measurement point according to the actual brightness values of the six gray scales of 32, 64, 96, 128, 192, and 255 of each measurement point, obtaining the actual brightness values of all gray scales of each measurement point, and calculating the target brightness values, the difference values, and the brightness compensation values of all gray scales of each measurement point.
Optionally, the method for obtaining the actual brightness values of all gray scales of each measurement point by using an intermediate value interpolation method includes two logic processes: firstly, adopting an intermediate value interpolation method for the coordinates of each measuring point, namely, adopting the intermediate value interpolation method for the same gray scale to obtain the actual brightness values of the measuring points of other coordinates; secondly, an intermediate value interpolation method is adopted for the actual brightness values of at least two gray scales of each measuring point, namely, the intermediate value interpolation method is adopted for the same measuring point, and the actual brightness values of other gray scales are obtained. The two logic processes can be synchronously carried out, so that the logic operation can be reduced, and the size of the display driving chip can be reduced.
In some scenarios, the brightness compensation value and the coordinates of each measurement point are stored in a Static Random-Access Memory (SRAM) of the display area 20 in a one-to-one correspondence. As shown in fig. 5, the LUT indicates a one-to-one correspondence relationship among coordinates, a luminance difference value (Delta L), and a luminance Compensation value (Compensation value) of each measurement point, LUT1 indicates an LUT corresponding to a gray level of 32, LUT2 indicates an LUT corresponding to a gray level of 64, LUT3 indicates an LUT corresponding to a gray level of 96, LUT4 indicates an LUT corresponding to a gray level of 128, LUT5 indicates an LUT corresponding to a gray level of 192, and LUT6 indicates an LUT corresponding to a gray level of 255.
Optionally, the display look-up table (LUT) in any of the embodiments may also be stored in the SRAM, and when the driving circuit is powered on, the LUT may be called for brightness compensation of the display driver, and along with the update of the real image, the LUT is deleted when the driving circuit is powered off, and thus the memory is not occupied.
Although step numbers such as S11 and S12 are used herein, the purpose is to briefly describe the corresponding content more clearly, and not to constitute a substantial limitation on the sequence, and in the specific implementation, S12 may be performed first, and then S11 may be performed, which are all within the protection scope of the present application.
Embodiments of the present application also provide a readable storage medium, which stores a driver, and when the driver is executed by a processor, the driver can implement one or more steps of the display driving method according to any of the embodiments.
Embodiments of the present application also provide a computer program product, which includes computer program code, when running on a computer, causes the computer to execute the method in the above various possible embodiments.
The embodiment of the present application further provides a chip, which includes a memory and a processor, where the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a device installed with the display driver chip executes the method in the above various possible embodiments.
In the embodiments of the terminal, the readable storage medium, the computer program product, and the chip provided in the present application, all technical features of the embodiments of the display driving method are included, and the expanding and explaining contents of the specification are substantially the same as those of the embodiments of the display driving method, and are not described herein again.
The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optics, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, memory Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is to be understood that the foregoing scenarios are only examples, and do not constitute a limitation on application scenarios of the technical solutions provided in the embodiments of the present application, and the technical solutions of the present application may also be applied to other scenarios. For example, as can be known by those skilled in the art, with the evolution of system architecture and the emergence of new service scenarios, the technical solution provided in the embodiments of the present application is also applicable to similar technical problems.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a device (e.g., a mobile phone, a computer, a server, a controlled terminal, or a network device) to execute the method of each embodiment of the present application.
The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are included in the scope of the present application.
Claims (10)
1. A display driving method for driving a display area to display an image, the display area having a plurality of sub-pixels, the method comprising:
selecting a plurality of measurement points of the display area, the measurement points comprising one or more sub-pixels;
acquiring actual brightness values of all the measuring points;
obtaining a target brightness value of each measuring point according to the coordinate and the actual brightness value of each measuring point;
acquiring a difference value between an actual brightness value and a target brightness value of each measuring point;
taking the difference value as a brightness compensation value of each measuring point in the display area;
and performing brightness compensation on the display area according to the brightness compensation value and displaying an image.
2. The display driving method according to claim 1, wherein the plurality of measurement points are distributed on the display area row by row and column by column.
3. The display driving method according to claim 2, wherein distances of adjacent measurement points in a row direction are equal or unequal; and/or the distances between adjacent measuring points in the column direction are equal or unequal.
4. The display driving method according to claim 1, wherein the obtaining of the actual luminance of each measurement point comprises: and acquiring the actual brightness value of a gray scale of each measuring point.
5. The display driving method according to claim 1, wherein the obtaining of the actual luminance of each measurement point comprises: and acquiring actual brightness values of at least two gray scales of each measuring point.
6. The display driving method according to claim 5, wherein the at least two gray levels comprise gray levels 32, 64, 96, 128, 192 and 255.
7. The display driving method according to claim 1, wherein the obtaining of the target brightness value of each measurement point according to the coordinates and the actual brightness value of each measurement point comprises one of:
inquiring according to a preset display lookup table to obtain a target brightness value of each measuring point, wherein the display lookup table records a one-to-one correspondence relationship between the brightness value and the coordinate;
or selecting the actual brightness value of one measuring point as the target brightness value of other measuring points;
or, selecting the average brightness value of a plurality of measurement points as the target brightness value.
8. The method according to claim 5, wherein obtaining the target brightness value of each measurement point according to the coordinates and the actual brightness value of each measurement point comprises:
and acquiring the actual brightness values of all gray scales of each measuring point by adopting an intermediate value insertion method.
9. The method according to claim 8, wherein obtaining the target brightness value of each measurement point according to the coordinates and the actual brightness value of each measurement point comprises:
and obtaining the actual brightness values of all gray scales of each measuring point by adopting an intermediate value interpolation method for the coordinates of each measuring point and adopting an intermediate value interpolation method for the actual brightness values of at least two gray scales of each measuring point.
10. The display driving method according to claim 1, wherein the luminance compensation values and coordinates of the respective measurement points are stored in one-to-one correspondence in an SRAM of the display area.
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| WO2024001094A1 (en) * | 2022-06-28 | 2024-01-04 | 惠科股份有限公司 | Pixel compensation method, pixel compensation device and display device |
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