A method and device for improving low-brightness mura

A low-brightness and high-brightness technology, applied in the field of image processing, can solve the problems of inaccurate acquisition of low-brightness shooting data, weak Mura, and imperceptibility, etc., to achieve the effect of improving the Mura phenomenon, increasing the brightness, and improving the Mura

Active Publication Date: 2021-10-15
昇显微电子(苏州)股份有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing technology can effectively improve the brightness difference between the medium brightness and high brightness display of the panel, but the Mura phenomenon is still obvious at low brightness (such as 0-10 grayscale)
With the gradual increase of the grayscale, the brightness will gradually increase, and the Mura phenomenon will gradually weaken. In the case of medium brightness (such as 32 grayscales), the Mura phenomenon is very weak and even difficult to detect.
The main reason for the above shortcomings is that low-brightness Mura changes greatly compared with medium-high brightness and it is impossible to accurately obtain low-brightness shooting data. However, the existing technology directly uses the compensation value of medium brightness for fitting to obtain the low-brightness compensation value.

Method used

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  • A method and device for improving low-brightness mura
  • A method and device for improving low-brightness mura
  • A method and device for improving low-brightness mura

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Effect test

Embodiment 1

[0039] Embodiment 1: Reduce from full resolution to half resolution

[0040] Such as figure 1 As shown, the implementation method of the present invention mainly includes the following steps:

[0041] S1. Brightness collection

[0042] (1) At full resolution, obtain the mapping table of input grayscale and output brightness at low brightness:

[0043] LUT1:[Lv 1 ,Lv 2 ,...,Lv n]=[f full (Gray 1 ), f full (Gray 2 ),...,f full (Gray n )]

[0044] where X=[Gray 1 , Gray 2 ,...,Gray n ] means the selected gray binding point value, Y=[Lv 1 ,Lv 2 ,...,Lv n ] indicates the brightness value corresponding to the gray binding point value. Any low-brightness input gray scale can be interpolated through the LUT1 look-up table to obtain the corresponding brightness value.

[0045] (2) At half-resolution, obtain the mapping table of output brightness and input grayscale at low and medium brightness:

[0046] LUT2: [Gray' 1 , Gray' 2 ,...,Gray' n ]=[f low (Lv' 1 ), f...

Embodiment 2

[0061] Embodiment 2: full resolution is reduced to a quarter resolution

[0062] Such as figure 1 As shown, the implementation method of the present invention mainly includes the following steps:

[0063] S1. Brightness acquisition

[0064] (1) At full resolution, obtain the mapping table of input grayscale and output brightness at low brightness:

[0065] LUT1:[Lv 1 ,Lv 2 ,...,Lv n ]=[f full (Gray 1 ), f full (Gray 2 ),...,f full (Gray n )]

[0066] where X=[Gray 1 , Gray 2 ,...,Gray n ] means the selected gray binding point value, Y=[Lv 1 ,Lv 2 ,...,Lv n ] indicates the brightness value corresponding to the gray binding point value. Any low-brightness input gray scale can be interpolated through the LUT1 look-up table to obtain the corresponding brightness value.

[0067] (2) Under the quarter resolution, obtain the mapping table of the output brightness and the input grayscale when the brightness is low or medium:

[0068] LUT2: [Gray' 1 , Gray' 2 ,......

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Abstract

The invention discloses a method and device for improving low-brightness Mura, including a mapping table LUT1 of full-resolution grayscale and brightness collected in advance, a mapping table LUT2 of reduced-resolution brightness and grayscale, an average brightness calculation unit, Output grayscale calculation unit and output unit, and discloses a method to improve low-brightness Mura. Under the premise of keeping the overall brightness unchanged, it uses lower resolution for processing, and uses higher brightness and lower resolution pixels to replace the original Low-brightness and high-resolution pixels achieve the effect of improving Mura.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a method and device for improving low-brightness Mura. Background technique [0002] In the manufacturing process of AMOLED (Active Matrix Organic Light Emitting Diode) panels, due to the limitations of the crystallization process, when LTPS TFTs are fabricated on large-area glass substrates, TFTs at different positions usually have different electrical parameters such as threshold voltage and mobility. Non-uniformity, which translates into brightness differences, is called the Mura phenomenon. In order to improve the display effect, compensation methods are needed, including internal compensation and external compensation. Internal compensation refers to the method of using the sub-circuit constructed by TFT to perform compensation inside the pixel, and the compensation range is limited. External compensation is a method of sensing the electrical or optical characteristics of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3225
CPCG09G3/3225G09G2320/0271
Inventor 张娇吴樟福秦良
Owner 昇显微电子(苏州)股份有限公司
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