CN117409739A - Gray scale compensation method of display panel, display device and compensation system - Google Patents

Gray scale compensation method of display panel, display device and compensation system Download PDF

Info

Publication number
CN117409739A
CN117409739A CN202210806389.3A CN202210806389A CN117409739A CN 117409739 A CN117409739 A CN 117409739A CN 202210806389 A CN202210806389 A CN 202210806389A CN 117409739 A CN117409739 A CN 117409739A
Authority
CN
China
Prior art keywords
gray
scale
compensation
value
picture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210806389.3A
Other languages
Chinese (zh)
Inventor
吴梓逸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Super Vision Display Technology Co ltd
Original Assignee
Super Vision Display Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Super Vision Display Technology Co ltd filed Critical Super Vision Display Technology Co ltd
Priority to CN202210806389.3A priority Critical patent/CN117409739A/en
Publication of CN117409739A publication Critical patent/CN117409739A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The gray scale compensation method of the display panel, the display device and the compensation system of the invention comprise the following steps: the display panel is enabled to display a first gray-scale picture with a first gray-scale value, a second gray-scale picture with a second gray-scale value and a third gray-scale picture with a specific gray-scale value, and the gray-scale value of each gray-scale picture is reduced according to the first gray-scale value, the specific gray-scale value and the second gray-scale value; acquiring a compensation table according to the specific gray scale value of the third gray scale picture and the corresponding third shooting gray scale data; acquiring a first conversion coefficient table for bright compensation according to the third gray-scale picture and the first gray-scale picture, and acquiring a second conversion coefficient table for dark compensation according to the third gray-scale picture and the second gray-scale picture; and multiplying the compensation gray-scale value with a positive value in the compensation gray-scale data of the compensation table by the corresponding coefficient value of the first conversion coefficient table, and multiplying the compensation gray-scale value with a negative value in the compensation gray-scale data of the compensation table by the corresponding coefficient value of the second conversion coefficient table to obtain the converted compensation table.

Description

Gray scale compensation method of display panel, display device and compensation system
Technical Field
The present invention relates to a gray-scale compensation method for a display panel, a display device and a compensation system, and more particularly, to a method for obtaining a conversion coefficient table in a defect compensation technique for uneven brightness of a display panel such as an LCD, wherein a memory in the display device stores a converted compensation table obtained by the gray-scale compensation method of the present invention, and the compensation system applies the gray-scale compensation method of the present invention to perform brightness compensation on the display panel.
Background
For the display panel which is already manufactured, due to the qualitative characteristics of the structure, uneven brightness (hereinafter, also simply referred to as Mura) caused by various factors in the manufacturing process of the display panel can be compensated for pixels with uneven brightness (hereinafter, referred to as Demura, uneven brightness compensation) by an external compensation mode of imaging matching, so that the problem of Mura is further improved.
The so-called Demura technology of an LCD panel generally adopts a photographing system to photograph a display screen of an LCD to be compensated and calculates compensation gray-scale data thereof, thereby compensating for a portion having uneven brightness. The basic principle of the Demura technique is to adjust the gray-scale data of the uneven portion of the LCD to compensate for the same brightness as the surrounding blocks. The process of compensating for gray scales from an input LCD panel to the gray scales of an image photographed by a camera requires: the gray-scale signal (voltage) input into the LCD panel drives the liquid crystal molecules to rotate and convert the liquid crystal molecules into the penetration brightness of the LCD, and then the light transmitted by the LCD is captured by the photodiode array of the camera and converted into the corresponding gray-scale signal of the image shot by the camera.
In the existing Demura technology, as shown in fig. 3, the method is specifically divided into the following two major steps: first, in the device building step S30, it includes: a pre-adjusting photographing system step S300 of controlling the LCD to output a corresponding compensation screen (for example, a predetermined pure gray-scale screen) for a single-chip-microcomputer LC D panel 302 assumed to be ideally displayed, and adjusting the photographing system parameters 301 so that the gray scale of the photographed image photographed by the LC D panel coincides with the gray scale of the display screen. Next, in a flow operation step S31, the steps include: a shooting and imaging step S310 of controlling the LCD panel 312 to be compensated to output a pure gray-scale picture for compensation, and shooting by using the shooting system 311 to obtain a shooting image 321; a compensation target image acquisition step S320 of calculating the photographed image 321 via the specific calculation method 322 to obtain a compensation target image 323; a compensation table acquisition step S330 of obtaining a compensation table 332 by compensating for the gray-scale value difference between the target image 323 and the photographed image 321 using the subtraction calculation method 331; a compensation table conversion step S340, in which the compensation table 332 is multiplied by the conversion coefficient table 342 by using the multiplication calculation method 341 to obtain a converted compensation table 343, and the conversion coefficients in the conversion coefficient table are all 1 because the photographing gray level has been adjusted to be consistent with the LCD output gray level in the pre-photographing system step S300; and a compensation table writing step S350, in which the converted compensation table 343 is written into the memory of the LCD through the writing operation 351.
Disclosure of Invention
The invention aims to solve the technical problems
In the above-described conventional compensation method, the compensation target image as the final compensation effect is theoretically a compensated image that is expected by people, and can be expressed as: gray-scale data of compensation target image=gray-scale data of display screen before compensation+gray-scale data of compensation table compensation, but in reality, the LCD panel Gray-scale and LCD light-emitting brightness do not have a linear relationship, but satisfy l=gray 2.2 Is a relationship of (3). The camera brightness has a corresponding non-linear relationship, but is related to the sensitivity curve of the photodiode and other factors, so that the gray level of the picture shot by the camera is not in a linear relationship with the compensation gray level of the LCD panel, and the compensation table obtained by shooting the image and processing the compensation target image by the shooting system needs to be converted by the compensation table conversion step S340 before being used for the LCD to compensate for the uneven brightness.
However, the above prior art still has the following problems: since different panels may have brightness differences from the tuner panel, the preset fixed parameters are not applicable to all panels. The compensation gray level and the shooting gray level are not in a linear relation, and the degree value of uneven brightness of the panel shot by the shooting system cannot be directly used for panel compensation. Under the condition that the LCD panel has unavoidable deviation in the manufacturing process, gamma (gray scale-brightness curve) at different positions is different so that conversion coefficients are different, which means that conversion relationships of all areas in the photographed panel are different, and the uniform matching coefficient can cause poor matching effect.
Solution to the problem
In order to solve the above-mentioned problems, the gray-scale compensation method according to the present invention is a gray-scale compensation method for compensating for uneven brightness of a display panel, comprising the steps of: displaying a first gray-scale picture with a first gray-scale value, a second gray-scale picture with a second gray-scale value and a third gray-scale picture to be compensated with a specific gray-scale value on the display panel, wherein the gray-scale value of each gray-scale picture is reduced according to the first gray-scale value, the specific gray-scale value and the second gray-scale value; acquiring a compensation table according to the specific gray scale value of the third gray scale picture and the corresponding third shooting gray scale data; acquiring a first conversion coefficient table for bright compensation according to the third gray-scale picture and the first gray-scale picture, and acquiring a second conversion coefficient table for dark compensation according to the third gray-scale picture and the second gray-scale picture; multiplying the compensation gray-scale value with a positive value in the compensation gray-scale data of the compensation table with the corresponding coefficient value of the first conversion coefficient table, and multiplying the compensation gray-scale value with a negative value in the compensation gray-scale data of the compensation table with the corresponding coefficient value of the second conversion coefficient table to obtain a converted compensation table; and burning the converted compensation table into a memory of the display panel.
The invention also relates to a display device comprising: a display panel and a memory, wherein the converted compensation table obtained by the gray-scale compensation method according to claim 1 is stored in the memory, and the display panel displays the gray-scale data in the converted compensation table.
The invention also relates to a compensation system comprising: a display panel including a memory; a panel control circuit for controlling the voltage value of the display panel so that the display panel displays a first gray-scale picture having a first gray-scale value, a second gray-scale picture having a second gray-scale value, and a third gray-scale picture having a specific gray-scale value to be compensated for, the gray-scale values of the respective gray-scale pictures being reduced according to the first gray-scale value, the specific gray-scale value, and the second gray-scale value; the shooting system shoots the display panel to display the gray-scale picture to be compensated, the first gray-scale picture and the second gray-scale picture respectively under the condition of setting the same shooting parameters; and a control device configured to: processing an image shot by a shooting system into shooting gray-scale data containing gray-scale values of units to be compensated through data; acquiring a compensation table according to the specific gray scale value of the gray scale picture to be compensated and corresponding shooting gray scale data; the following calculation is performed based on the compensation gray-scale data of the compensation table: acquiring a first conversion coefficient table for bright compensation according to the third gray-scale picture and the first gray-scale picture, and acquiring a second conversion coefficient table for dark compensation according to the third gray-scale picture and the second gray-scale picture; multiplying the compensation gray-scale value with a positive value in the compensation gray-scale data of the compensation table with the corresponding coefficient value of the first conversion coefficient table, and multiplying the compensation gray-scale value with a negative value in the compensation gray-scale data of the compensation table with the corresponding coefficient value of the second conversion coefficient table to obtain a converted compensation table; and burning the converted compensation table into the memory of the display panel.
Effects of the invention
According to the above configuration of the present invention, it is possible to provide a gray scale compensation method, a display device and a compensation system for a display panel, in which the method of presetting a fixed parameter set by the panel is eliminated, so that the accuracy of compensation when fitting the photographed gray scale to the compensated gray scale is improved, and in the case that the LCD process variation causes different in-plane Gamma of the LCD, since the compensation coefficients are independently calculated, an accurate compensation effect can be provided even if the in-plane Gamma is different, and the problem of poor matching effect due to the panel brightness difference can be further improved.
Drawings
Fig. 1 is a schematic diagram illustrating a compensation system 100.
Fig. 2A is a schematic diagram illustrating the gray-scale compensation method of the present invention.
Fig. 2B is a flowchart of a gray level compensation method according to the present invention.
Fig. 3 is a schematic diagram showing a gray-scale compensation method of the related art.
Detailed Description
Embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The same or corresponding parts as those in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated. In the drawings referred to below, the configuration is simplified or schematically shown for ease of understanding, or some of the constituent members are omitted. The dimensional ratios between the constituent members shown in the drawings do not necessarily represent actual dimensional ratios.
[1.1 construction of Compensation System 100 ]
Referring to fig. 1, a compensation system 100 to which the gray-scale compensation method of the present invention is applied will be described. As shown in fig. 1, the compensation system 100 includes a display panel 1, a photographing system 2, a control device 3, and a panel control circuit 4.
The display panel 1 is usually a semi-finished product of a display device to which no backlight is attached, and in the present embodiment, the case where the display panel 1 is an LCD panel is described, but the present invention is applicable to other types of display panels.
The display panel 1 is provided with a Memory 5, and the Memory 5 may be implemented by an SD Memory card, a hard disk, a mask ROM, an EPROM (Erasable Programmable Read Only Memory ), an EEPROM (Electro nically Erasable Programmable Read-Only Memory), or the like. The memory 5 can store various data, and the various data can be written (burned) by the panel control circuit 4 or written (burned) by the control device 3. The panel control circuit 4 controls the display of the display panel 1 according to the control of the control device 3 and the data read from the memory 5.
The memory 5 may be provided at other portions of the display device independently of the display panel 1.
The imaging system 2 includes, for example, an imaging element such as a CCD or CMOS image sensor with high accuracy and high resolution, and an imaging optical system such as a zoom lens and a focus lens, and the imaging system 2 is controlled by, for example, the control device 3 to capture a screen displayed in a display area of the display panel 1 to be compensated.
The control device 3 can control the operations of the display panel 1, the imaging system 2, the panel control circuit 4, and the like in the compensation system 100. For example, the control device 3 controls the LCD panel 1 to be lit up with predetermined gradation data (voltage) via the panel control circuit 4, and after the photographing system 2 photographs, performs data processing on the image photographed by the photographing system 2 to become gradation data including gradation values of units to be compensated, and sends the gradation data for compensation after the processing to the memory 5 of the display panel 1. The data processing of the control device 3 includes a specific calculation method 322, a subtraction calculation method 331, a conversion coefficient calculation method 41, multiplication calculation methods 51, 52, and the like.
[1.2 Gray Scale Compensation method ]
An imaging matching system and method according to a first embodiment of the present invention will be described with reference to fig. 2A and 2B. Fig. 2A is a schematic block diagram illustrating the gray-scale compensation method of the present invention, and fig. 2B is a flowchart of the gray-scale compensation method according to the present invention.
First, for the low-gray-scale screen 11, the to-be-compensated gray-scale screen 12, and the high-gray-scale screen 13 displayed on the LCD panel 1, the photographing system 2 with the same photographing parameters is used to obtain the photographed image 11' corresponding to the low-gray-scale screen, the photographed image 12' corresponding to the to-be-compensated gray-scale screen, and the corresponding photographed image 13' of the high-gray-scale screen, respectively (step S1). The input gray scale value corresponding to the low gray scale picture is lower than the input gray scale value corresponding to the gray scale picture to be compensated, and the input gray scale value corresponding to the high gray scale picture is higher than the input gray scale value corresponding to the gray scale picture to be compensated.
In the present embodiment, the gray-scale screen 12 to be compensated, the high gray-scale screen 13, and the low gray-scale screen 11 are all selected to be pure gray-scale screens having a single gray-scale value, and any one of the gray-scale values may be selected from 0 to 255. The gray-scale screen to be compensated may be displayed with a plurality of different gray-scale values, and the different gray-scale values are preferably selected from the respective gray-scale value ranges in a stepwise manner, for example, when the gray-scale value range is divided into 4 parts, the gray-scale screen to be compensated 12 is displayed with any one of the gray-scale values selected from 0 to 63, 64 to 127, 128 to 191, and 192 to 255, respectively, and the gray-scale values of the high gray-scale screen 13 and the low gray-scale screen 11 may be appropriately set for each of the gray-scale values selected for the gray-scale screen to be compensated 12. However, the present invention is not limited thereto, and the gray-scale frame 12 to be compensated may be a frame displaying different gray scales in different areas. In the case of displaying the pictures of different gray scales in the partition, the gray scale values of the high gray scale picture 13 and the low gray scale picture 11 may be appropriately set for the corresponding gray scale values of the respective regions of the gray scale picture 12 to be compensated.
In addition, in the present embodiment, the gray-scale values of the high gray-scale screen 13 and the low gray-scale screen 11 may be set appropriately according to the compensation requirement, as compared with the gray-scale value of the gray-scale screen 12 to be compensated. For example, the difference between the gray-scale value of the high gray-scale screen 13 and the gray-scale value of the gray-scale screen 12 to be compensated is preferably set to be greater than 0 and not more than 15, more preferably set to be 5 or more and 10 or less, and in addition, the difference between the gray-scale value of the gray-scale screen 12 to be compensated and the gray-scale value of the low gray-scale screen 11 is preferably set to be greater than 0 and not more than 15, more preferably set to be 5 or more and 10 or less. However, it should be noted that an excessively small gray level difference may result in insufficient gray level compensation, and an excessively large gray level difference may result in excessive gray level compensation. In the present embodiment, as an example, the gray-scale value of the gray-scale picture to be measured is 32, the gray-scale value of the high gray-scale picture is 42, and the gray-scale value of the low gray-scale picture is 22, but not limited thereto.
Next, according to the gray-scale data of the photographed image 12' corresponding to the gray-scale picture to be compensated, the gray-scale data of the compensation target image 21 is calculated by the specific calculation method 322 (step S2). The specific calculation method 322 may use an existing calculation method as long as the gray-scale data of the compensation target image 21 can be obtained. The gray-scale data described in the present specification is a gray-scale value of each unit to be compensated for the display panel, where each unit to be compensated may be divided according to pixels, may be divided according to an equal area, or may be divided according to a user requirement, and is not particularly limited.
Next, the compensation table 31 is obtained by subtracting the gray-scale value of the compensation target image 21 from the gray-scale value of the photographed image 12' corresponding to the gray-scale screen to be compensated (step S3). The compensation table 31 contains gray-scale data of compensation gray-scale values of the respective units to be compensated.
Then, according to the high gray-scale picture 13 and the gray-scale picture 12 to be compensated and the corresponding photographed images, a first conversion coefficient table 42 is obtained by calculation; the second conversion coefficient table 43 is calculated according to the low gray-scale image 11, the gray-scale image 12 to be compensated and the photographed images corresponding to the two images (step S4). Specifically, the first conversion coefficient table 42 is calculated by the conversion coefficient calculation method 41 from the gray-scale value difference between the gray-scale value of the high gray-scale screen 13 and the gray-scale value of the gray-scale screen 12 to be compensated divided by the gray-scale value difference of the photographed image corresponding to the two, that is, the gray-scale value difference between the gray-scale value of the photographed image 13 'corresponding to the high gray-scale screen and the gray-scale value of the photographed image 12' corresponding to the gray-scale screen to be compensated. The second conversion coefficient table 43 is calculated by the conversion coefficient calculation method 41 by dividing the gray-scale value difference between the gray-scale value of the gray-scale picture 12 to be compensated and the gray-scale value of the low gray-scale picture 11 by the gray-scale value difference of the photographed image corresponding to the gray-scale value of the two, that is, the gray-scale value difference between the gray-scale value of the photographed image 12 'corresponding to the gray-scale picture to be compensated and the gray-scale value of the photographed image 11' corresponding to the low gray-scale picture.
Next, the compensation gray-scale value of the compensation gray-scale data of the compensation table 31, which is a positive value, is multiplied by the corresponding coefficient value of the first conversion coefficient table 42, and the compensation gray-scale value of the compensation gray-scale data of the compensation table 31, which is a negative value, is multiplied by the corresponding coefficient value of the second conversion coefficient table 43, thereby obtaining the post-conversion compensation table 53 (step S5). Therefore, the post-conversion compensation table 53 is made to contain the gray-scale data of the compensation gray-scale value of the gray-scale value to be displayed more practically for each unit to be compensated.
The converted compensation table 53 is burned into the memory 5 of the L CD panel to be compensated, such as LCD-ROM, via the burning operation 351 (step S6). Accordingly, the post-conversion compensation table 53 obtained by the above-described gray-scale compensation method is stored in the memory 5, and thus the display panel 1 can display gray-scale data in the post-conversion compensation table 53.
[1.3 mathematical model of Gray-Scale Compensation method ]
If the display gray-scale data of the gray-scale frame 12 to be compensated of the display panel 1 including the gray-scale values of each compensation unit is set as the matrix P T The captured gray-scale data of the corresponding captured image 12' is set as a matrix C T The display gray-scale data of the high gray-scale screen 13 is set as a matrix P H High gray-scale pictureThe captured gray-scale data of the captured image 13' corresponding to the surface is set as a matrix C H Thus, the first conversion coefficient table 42 for the brightness compensation is obtained from the display gray-scale data of the gray-scale screen 12 to be compensated and the high gray-scale screen 13 and the corresponding photographing gray-scale data, using the matrix k 1 The representation is:
in addition, the display gray-scale data including each compensation unit of the low gray-scale screen 11 is set as a matrix P L The captured gray-scale data of the captured image 11' corresponding to the low gray-scale screen is set as a matrix C L Thus, the following second conversion coefficient table 43 for dark compensation can be obtained from the display gray-scale data of the gray-scale screen 12 to be compensated and the low gray-scale screen 11 and the corresponding photographing gray-scale data, using the matrix k 2 The representation is:
therefore, when the compensation gray-scale data of the compensation table 31 is represented by the matrix T, the post-conversion compensation table 53 is represented by the matrix R, which is:
the display gradation data is determined by gradation data inputted to the display panel 1. For example, when the display panel 1 is caused to display an image having a specific gray-scale value, the gray-scale value of the display gray-scale data is the specific gray-scale value. In the present embodiment, a plurality of images may be captured when capturing the captured image 12' corresponding to the gray-scale screen to be compensated, the captured image 11' corresponding to the low gray-scale screen, and the captured image 13' corresponding to the low gray-scale screen, and the captured gray-scale data corresponding to each of the gray-scale screen to be compensated, the first gray-scale screen, and the second gray-scale screen may be obtained by averaging the captured images.
1.4 software-based implementation
The control device 3 of the gray-scale compensation method according to the present invention may be implemented by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be implemented by software. In the former case, the control device 3 may be a dedicated electronic circuit designed to realize a predetermined function, or may be a hardware circuit such as a reconfigurable electronic circuit.
For example, the control device 3 is a computer for executing a command as a program of software for realizing each function. The computer includes, for example, one or more processors, and a computer-readable recording medium storing the program. In the computer, the processor reads the program from the recording medium and executes the program to achieve the object of the present invention. As the processor, for example, a C PU (Central Processing Unit: central processing unit) is used. As the recording medium, a "non-transitory tangible medium" can be used, and for example, a magnetic tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used in addition to a ROM (Read Only M emory: read only memory) or the like. Further, a RAM (Random Access Memory: random access memory) or the like for expanding the program may be provided. The program may be supplied to the computer via any transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program. In one embodiment of the present invention, the program may be embodied as a signal embedded in a carrier wave by electronic transmission.
The invention replaces the prior art that all panels to be compensated use the same conversion coefficient, and uses three different gray scales shot under the same shooting parameters to convert the compensation table, thereby omitting the step of a pre-adjusting shooting system in the step of setting up equipment, further improving the problem of poor matching effect caused by the brightness difference of the panels, improving the accuracy of compensation when the gray scales are matched from shooting to compensating, and even if the Ga mma (gamma) in the plane are different, the accurate compensation effect can be brought.
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims, and embodiments in which technical means disclosed in the different embodiments are appropriately combined are also included in the technical scope of the present invention. Further, by combining the technical means disclosed in each of the embodiments, new technical features can be formed.
Description of the reference numerals
1: display panel (LCD panel)
2: shooting system
3: control device
4: panel control circuit
5: memory device
11: low gray level picture (second gray level picture)
12: gray scale picture to be compensated (third gray scale picture)
13: high gray-scale picture (first gray-scale picture)
11': shooting image corresponding to low gray-scale picture (second shooting image)
12': shooting image corresponding to gray-scale picture to be compensated (third gray-scale picture)
13': shooting image corresponding to high gray-scale picture (first gray-scale picture)
21: compensating a target image
31: compensation meter
42: first conversion coefficient table
43: second conversion coefficient table
53: compensation table after conversion.

Claims (10)

1. A gray-scale compensation method for compensating for uneven brightness of a display panel, comprising the steps of:
displaying a first gray-scale picture with a first gray-scale value, a second gray-scale picture with a second gray-scale value and a third gray-scale picture to be compensated with a specific gray-scale value on the display panel, wherein the gray-scale value of each gray-scale picture is reduced according to the first gray-scale value, the specific gray-scale value and the second gray-scale value;
acquiring a compensation table according to the specific gray scale value of the third gray scale picture and the corresponding third shooting gray scale data;
acquiring a first conversion coefficient table for bright compensation according to the third gray-scale picture and the first gray-scale picture, and acquiring a second conversion coefficient table for dark compensation according to the third gray-scale picture and the second gray-scale picture;
multiplying the compensation gray-scale value with a positive value in the compensation gray-scale data of the compensation table with the corresponding coefficient value of the first conversion coefficient table, and multiplying the compensation gray-scale value with a negative value in the compensation gray-scale data of the compensation table with the corresponding coefficient value of the second conversion coefficient table to obtain a converted compensation table; and
and burning the converted compensation table into a memory of the display panel.
2. The gray scale compensation method of claim 1, wherein,
if the display gray-scale data of the third gray-scale picture including the gray-scale values of each unit to be compensated is set as a matrix P T The corresponding third photographing gray-scale data is set as a matrix C T Setting the display gray-scale data of the first gray-scale picture as a matrix P H The corresponding first shooting gray-scale data is set as a matrix C H The first conversion coefficient table is a matrix k 1 The step of obtaining the first conversion coefficient table is calculated according to formula 1:
3. the gray scale compensation method of claim 1, wherein,
if the display gray-scale data of the third gray-scale picture including the gray-scale values of each unit to be compensated is set as a matrix P T The corresponding third photographing gray-scale data is set as a matrix C T Setting the display gray-scale data of the second gray-scale picture as a matrix P L Corresponding toThe second shot gray-scale data is set as a matrix C L The matrix k for the second conversion coefficient table 2 The step of obtaining the second conversion coefficient table is calculated according to equation 2:
4. a gray scale compensation method according to any one of claim 1 to 3, characterized in that,
the difference between the first gray-scale value and the particular gray-scale value is greater than 0 and no more than 15.
5. A gray scale compensation method according to any one of claim 1 to 3, characterized in that,
the difference between the specific gray scale value and the second gray scale value is greater than 0 and not more than 15.
6. The gray scale compensation method according to claim 1, further comprising:
and shooting an image, namely shooting images of the display panel when the third gray-scale picture, the first gray-scale picture and the second gray-scale picture are displayed by using a shooting system with the same shooting parameters, and processing the shot images into shooting gray-scale data containing gray-scale values of each unit to be compensated through data.
7. The gray scale compensation method of claim 1, wherein,
in the shooting and image taking step, a plurality of images are shot on the third gray-scale picture, the first gray-scale picture and the second gray-scale picture, and shooting gray-scale data corresponding to the third gray-scale picture, the first gray-scale picture and the second gray-scale picture are respectively obtained by means of calculating average values.
8. The gray scale compensation method of claim 1, wherein,
the first gray scale picture, the second gray scale picture and the third gray scale picture are all pure gray scale pictures.
9. A display device, comprising: a display panel and a memory device, wherein the memory device comprises a memory,
the memory stores therein the post-conversion compensation table obtained by the gray-scale compensation method of claim 1,
and the display panel displays the gray-scale data based on the converted compensation table.
10. A compensation system, comprising:
a display panel including a memory;
a panel control circuit for controlling the voltage value of the display panel so that the display panel displays a first gray-scale picture having a first gray-scale value, a second gray-scale picture having a second gray-scale value, and a third gray-scale picture having a specific gray-scale value to be compensated for, the gray-scale values of the respective gray-scale pictures being reduced according to the first gray-scale value, the specific gray-scale value, and the second gray-scale value;
the shooting system shoots the display panel to display the gray-scale picture to be compensated, the first gray-scale picture and the second gray-scale picture respectively under the condition of setting the same shooting parameters; and
a control device configured to:
processing an image shot by a shooting system into shooting gray-scale data containing gray-scale values of units to be compensated through data;
acquiring a compensation table according to the specific gray scale value of the gray scale picture to be compensated and corresponding shooting gray scale data;
the following calculation is performed based on the compensation gray-scale data of the compensation table: acquiring a first conversion coefficient table for bright compensation according to the third gray-scale picture and the first gray-scale picture, and acquiring a second conversion coefficient table for dark compensation according to the third gray-scale picture and the second gray-scale picture; multiplying the compensation gray-scale value with a positive value in the compensation gray-scale data of the compensation table with the corresponding coefficient value of the first conversion coefficient table, and multiplying the compensation gray-scale value with a negative value in the compensation gray-scale data of the compensation table with the corresponding coefficient value of the second conversion coefficient table to obtain a converted compensation table; and, in addition, the processing unit,
and burning the converted compensation table into the memory of the display panel.
CN202210806389.3A 2022-07-08 2022-07-08 Gray scale compensation method of display panel, display device and compensation system Pending CN117409739A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210806389.3A CN117409739A (en) 2022-07-08 2022-07-08 Gray scale compensation method of display panel, display device and compensation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210806389.3A CN117409739A (en) 2022-07-08 2022-07-08 Gray scale compensation method of display panel, display device and compensation system

Publications (1)

Publication Number Publication Date
CN117409739A true CN117409739A (en) 2024-01-16

Family

ID=89489572

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210806389.3A Pending CN117409739A (en) 2022-07-08 2022-07-08 Gray scale compensation method of display panel, display device and compensation system

Country Status (1)

Country Link
CN (1) CN117409739A (en)

Similar Documents

Publication Publication Date Title
CN109256096B (en) Display brightness compensation method, device and equipment
US11120757B2 (en) Gray scale adjustment method and device for display panel
US10636345B2 (en) Method of compensating in display panel, driving unit and display panel
WO2020034735A1 (en) Imaging control method and electronic device
TWI433533B (en) Image capturing device and image synthesis method thereof
CN107203056B (en) Mura processing method for ultrahigh-resolution panel
US8830140B2 (en) Method for automatically adjusting electronic display settings
CN109523955A (en) Pixel compensation method and device, storage medium, display screen
CN112950657A (en) Gamma value correction method, gamma value correction device, electronic device, and readable storage medium
CN113724652B (en) Compensation method and device for Mura of OLED display panel and readable medium
JP2009533956A (en) Adjustable extinction filter system for dynamic range compression from scene to imaging sensor
US20060228102A1 (en) Photographing apparatus and method for compensating brightness of an image
CN110796979B (en) Driving method and driving device of display panel
CN114898717B (en) Residual image compensation method, device, display equipment and computer readable storage medium
KR102328446B1 (en) Detecting method of gray scale correction data of liquid crystal display panel
US20180114301A1 (en) Image Processing Method, Image Processing Apparatus and Display Apparatus
WO2019080286A1 (en) Driving method for display apparatus, and display apparatus
CN102484679A (en) Image processing device, image processing method, and program
CN101577796B (en) Image processing apparatus, method
CN108281120B (en) Mura repairing method of display panel
CN110389463B (en) Method and system for displaying high dynamic range images
KR101923162B1 (en) System and Method for Acquisitioning HDRI using Liquid Crystal Panel
CN117409739A (en) Gray scale compensation method of display panel, display device and compensation system
CN115019723A (en) Screen display method, screen display device, electronic apparatus, program, and medium
CN109814290B (en) Display device, control method thereof and computer readable medium

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination