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Multi-pixel fusion compression and decompression method for display Mura calibration

A compression method, multi-pixel technology, applied in static indicators, instruments, etc., to reduce errors, ensure DeMura quality, and reduce the amount of data

Active Publication Date: 2022-04-15
苇创微电子上海有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the existing technical problems, the present invention provides a multi-pixel fusion compression and decompression method for display Mura calibration, so that several adjacent sub-pixels share the same set of modeling data, and add brightness difference information encoding values ​​at the same time to reduce Error due to pixel fusion

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  • Multi-pixel fusion compression and decompression method for display Mura calibration
  • Multi-pixel fusion compression and decompression method for display Mura calibration
  • Multi-pixel fusion compression and decompression method for display Mura calibration

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Embodiment 1

[0043] This embodiment provides a multi-pixel fusion compression method for display Mura calibration. This embodiment takes the 1x2 compression method as an example, including the following steps:

[0044] Shooting: Use an imaging luminance meter to shoot several grayscale images of the same color of the display screen to be tested.

[0045] For a specific screen, the gray levels of the 18 three colors captured are {R1, R2, R3, R4, R5, R6, G1, G2, G3, G4, G5, G6, B1, B2, B3, B4, B5, B6}, where R stands for red, G stands for green, and B stands for green. For example, R1 is red with 32 gray levels (displaying 8bit color depth, the maximum value is 255).

[0046] Image extraction: Extract the sub-pixel brightness value of each sub-pixel in each gray-scale image of the same color ; Wherein, i and j are both positive integers, i is the serial number of the grayscale image of the same color, and j is the sub-pixel serial number. The data of 18 gray scales is captured, and the di...

Embodiment 2

[0070] In this embodiment, the method for decompressing the Mura calibration data of Embodiment 1 includes the following steps:

[0071] The modeling parameter encoded value is restored to a modeling parameter. Taking the same set of coding values ​​of modeling parameters shared by every two adjacent sub-pixels in Example 1 as an example, we will restore these two sub-pixels based on decoding. If we do not consider the error of data compression, we can obtain accurate k j(1,2) =3.774, b j(1,2) =-0.0063.

[0072] Using the modeling parameters as the parameters of the fitting function to obtain the fitting function, namely ;

[0073] Substitute the gray value of each gray scale into the fitting function, and calculate the average gray scale decoding value of the 1×2 sub-pixel block of each gray scale (the function value in Table 3);

[0074] The average grayscale decoded value is subjected to gamma transformation to obtain the average luminance decoded value of each graysca...

Embodiment 3

[0084] The difference between this embodiment and Embodiment 1 and Embodiment 2 is that a quadratic function is used for fitting, and the fitting function obtained is: , at this time the modeling parameters include 3, a=0.0659, b=3.3679, c=0.4042. After compression and decompression, the obtained errors are shown in Table 5:

[0085] Table 5 Comparison of decoded errors of sub-pixel luminance values ​​of quadratic fitting

[0086]

[0087] Among them, the error data of the sub-pixel j and the sub-pixel j+1 having the coded value of the brightness difference information are obviously smaller.

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Abstract

The invention provides a multi-pixel fusion compression method for display Mura calibration. The multi-pixel fusion compression method comprises the following steps: shooting a same-color gray-scale image of a display screen to be detected; extracting a sub-pixel brightness value of each sub-pixel; fusing the sub-pixel brightness values of the n * m adjacent sub-pixels to obtain an average brightness value of n * m sub-pixel blocks, and obtaining a brightness difference information coding value; obtaining an average gray value corresponding to the average brightness value, and performing modeling combination on the average gray values of the same-color gray-scale images to obtain modeling parameters; obtaining a modeling parameter coded value; and merging the brightness difference information coded value and the modeling parameter coded value as Mura calibration data for storage. The invention provides a supplementary method for fusion compression by using 1 * 2 or higher space sub-pixels, so that the DeMura quality is ensured, the data volume is reduced, the area and the cost on a Driver IC (Integrated Circuit) chip are also reduced, and the cost is favorably reduced.

Description

technical field [0001] The invention relates to a multi-pixel fusion compression and decompression method for display Mura calibration, and belongs to the field of display technology. Background technique [0002] In the existing technology, the use of current-driven self-luminous displays (including OLED displays, MiniLED displays, and future MicroLED displays) will produce circuit inconsistencies at the sub-pixel level due to limitations in the manufacturing process. This inconsistency is manifested in the display, which is an overall or partial display inhomogeneity, manifested as block, sand, dot, etc., this inhomogeneity is collectively referred to as Mura (referring to the uneven brightness of the display, causing various traces). Mura usually has two types of brightness Mura and color Mura, indicating the unevenness of brightness and color. Currently, limiting Mura is one of the main factors for the yield rate of domestic OLED production. And the Mura calibration fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/3208
Inventor 蔡剑李堃黄鉴叶选新蔡杰羽石炳磊白海楠朱诗文
Owner 苇创微电子上海有限公司
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