An integrated system and method for oled stain detection and repair

Abstract

The invention belongs to the technical field of panel detection, and discloses an integrated system and method for detecting and repairing OLED stains. The system includes a computing unit, an optical measuring unit, and a driving unit; the driving unit acts on the panel to drive it to light up different gray scales The white screen; the optical measurement unit is used to shoot the pixel brightness measurement picture and the chromaticity measurement picture of the panel under the white screen under the trigger of the drive unit; Brightness and chromaticity and determine the color spot type and level accordingly; and calculate the compensation data of each channel of R / G / B according to the brightness and chromaticity of each gray scale and convert it into a format acceptable to the driver chip of the panel and send it to the panel In the memory; under the control of the demura enable status register, the compensation data in the memory is called to repair the color spot on the panel to be repaired; the present invention reduces the test time by 2 / 3, greatly improves the work efficiency of color spot detection and compensation, and makes white The brightness uniformity of the picture is better compensated.

Description

technical field [0001] The invention belongs to the field of display technology, and more specifically relates to an integrated system and method for detecting and repairing OLED stains. Background technique [0002] Due to the limitations of the crystallization process, low-temperature polysilicon thin-film transistors (LTPS TFTs) fabricated on large-area glass substrates often have non-uniformity in electrical parameters such as threshold voltage and mobility. , this non-uniformity will be converted into current difference and brightness difference of OLED display device, and be perceived by human eyes, that is, mura (color spot) phenomenon. The mura repair technology is a technology that eliminates the mura phenomenon of the display and makes the brightness of the screen uniform. [0003] In the prior art, for example, a method for eliminating the Mura of an OLED display panel disclosed in Chinese patent application number 201610200089.5 first selects the corresponding c...

AI Technical Summary

Problems solved by technology

[0006] A. It takes a long time. Taking R / G / B each with 6 gray-scale images as an example, a total of 18 images need to be shot, and the low gray-scale brightness and low exposure time are longer;

[0007] B. Due to the current limitation of the OLED drive circuit, the current of a single-channel screen (R / G / B screen) and the current of a multi-channel screen (such as a white screen) are not simply superimposed or linear, and the R / G / B screen The IRDROP may be different from the IRDROP of the white picture, and the single-color picture can be compensated better by extracting the brightness for compensation alone, but the compensation effect of the compensation data for the multi-channel picture cannot be optimal;

[0008] C. Due to the existence of current limitation, the sum of the current values ​​of the RGB monochrome screen is greater than the current of the white screen, and the compensation of the monochrome screen cannot be equal to the compensation of the white screen, so the compensation ability for the color shift type Mura is poor, and it is impossible to evaluate before and after compensation. Chromaticity shift of

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