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7: Active mura illuminating method based on area array light‐emitting devices
Author(s) -
Yu Changqing,
Cheng Huidong,
Cheng Xueyuan
Publication year - 2021
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.15005
Subject(s) - reflection (computer programming) , brightness , optics , light intensity , mura , total internal reflection , light reflection , intensity (physics) , computer science , materials science , optoelectronics , physics , liquid crystal display , programming language
In non‐contact optical defect detection, we often encounter a problem that the reflection intensities from different positions in the detected target areas exceed the dynamic range of the camera response. To solve this problem, this paper focuses on the application of flexible display devices such as OLED, Mini LED and Micro LED as lighting sources. The intensity distribution of the reflected light of the detected product in the field of view of the camera is used as a feedback matrix to compensate the intensity distribution of the area array light source, which reduces the light intensity of high reflection area and improve the light intensity of low reflection area. As a result, one can avoid the image saturation of high reflection area and improve the image brightness of low reflection area. The defects in both high and low reflection area can be displayed clearly at the same time.