9 February 2006 Automatic mura detection system for liquid crystal display panels
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In this paper, we propose an automatic inspection system, which can automatically detect four types of muras on an LCD panel: cluster mura, v-band mura, rubbing mura, and light leakage mura. To detect cluster muras, the Laplacian of Gaussian (LOG) filter is used. A multi-resolution approach is proposed to detect cluster muras of different scales. To speed up the processing speed, this multi-resolution approach is actually implemented in the frequency domain. To detect v-band muras, we check the variation tendency of the projected 1-D intensity profile. Then, v-band muras are detected by identifying these portions of the 1-D profile where a large deviation occurs. To detect rubbing muras, we designed a frequency mask to detect distinct components in the frequency domain. To detect light leak muras, we apply image mirroring over the boundary parts and adopt the same LOG filter that has been used in detecting cluster muras. All four types of mura detection are integrated together in an efficient way and simulation results demonstrate that this system is indeed very helpful in detecting mura defects.
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Li-Te Fang, Li-Te Fang, Hsin-Chia Chen, Hsin-Chia Chen, I-Chieh Yin, I-Chieh Yin, Sheng-Jyh Wang, Sheng-Jyh Wang, Chao-Hua Wen, Chao-Hua Wen, Cheng-Hang Kuo, Cheng-Hang Kuo, "Automatic mura detection system for liquid crystal display panels", Proc. SPIE 6070, Machine Vision Applications in Industrial Inspection XIV, 60700G (9 February 2006); doi: 10.1117/12.650686; https://doi.org/10.1117/12.650686


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