Method and system for removing moire of image, measuring sub-pixel brightness of display panel and repairing Mura defects

Abstract

The invention belongs to the technical field of display panel detection and repair, and discloses a method and system for removing moire of an image, measuring sub-pixel brightness of display panel and repairing Mura defects. According to the method for removing the moire of the image, a Wiener filter which corrects a noise spectrum signal is adopted to filter a spectrum peak value in a gray-scaleimage displayed by a display panel, so that the purpose of removing the moire of the image is achieved; according to the Wiener filter with the corrected noise spectrum signal, a spectrum peak valuecorresponding to moire in a gray-scale image is used as a high-frequency noise signal to be superposed into noise of the Wiener filter; according to the display panel sub-pixel point degree measuringmethod, the sub-pixel point brightness is extracted after image moire is removed by utilizing the method; and the measurement system comprises a signal generator, an image acquisition device and a processing unit. A picture image presented by the display panel is acquired by the acquisition device, and the processing unit firstly adopts the method provided by the invention to remove the moire on the basis of the acquired picture image and then calculates the brightness of the sub-pixel points, so that the accurate measurement of the brightness of the sub-pixel points is realized.

Description

technical field [0001] The invention belongs to the technical field of display panel detection, and more specifically relates to a method and system for removing image moiré, measuring brightness of sub-pixels of a display panel, and repairing mura defects. Background technique [0002] The uneven brightness of the display panel (also known as mura defect) is the most important factor affecting the production yield of the display panel. Most large-size LCD display panels have large Mura, which can be directly repaired by Mura compensation. On the other hand, in self-luminous display panels such as OLED or MicroLED, each sub-pixel is independently driven, and the brightness unevenness caused by uneven materials is at the sub-pixel level. [0003] Before Mura compensation, although the input of each sub-pixel is the same, the luminance output is inconsistent; DeMura (Mura defect repair) technology adjusts the input of each sub-pixel to make the luminance output of each sub-pi...

AI Technical Summary

Problems solved by technology

Moiré can be avoided by shooting out of focus, but the brightness jump information of pixels and high-frequency Mura information will be missed, resulting in poor DeMura effect

There is also a solution to remove moiré by adding a low-pass filter in front of the camera lens, but the high-frequency information of the image will also be missed

There is also a solution to use an interpolation algorithm to remove moiré, but it will cause distortion to the edge of the image or the algorithm is complex and the calculation time is long, which does not meet the needs of the production line.

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