NDLI: Detection of Gap Mura in TFT LCDs by the Interference Pattern and Image Sensing Method

Content Provider	IEEE Xplore Digital Library
Author	Jang Zern Tsai Rong-Seng Chang Tung-Yen Li
Copyright Year	1963
Abstract	In this paper, we focus on pretesting to find the gap mura defects before the injection of liquid crystal into the cell of a thin-film-transistor liquid-crystal display panel. An optical interference pattern sensing method for inspection of the gap mura defects is used. We propose automatic quantization of mura panel defects in terms of the crossing points of the interference pattern. By doing so, panels with unacceptable gap mura could be sorted out simply by a binary classification, which facilitates automated visual inspection. The advantages of using this method include that it allows for pretesting before the injection of liquid crystal, meaning that defective panels can be found before the next process step and the wastage of liquid crystal materials can be avoided. The yield rate and manufacturing process efficiency can be improved and the inspection time can be shortened from 20 s by human inspection to less than 2 s by automatic inspection. Experiment results show that the proposed method offers improved performance for gap mura detection.
Sponsorship	IEEE Instrumentation and Measurement Society Bureau international des poids et mesures IEEE International Bureau of Weights and Measures (BIPM) URSI NBS Agency Ind. Sci. & Technol., Min. Int. Trade & Ind. Sci. Council Japan International Union of Pure and Applied Physics (IUPAP) NIST NRCC National Conference of Standards Laboratories (NCSL) Allen Osborne Associates Andeen-Hagerling, Inc. Ballantine Lab. Inc. Clarke-Hess Communications Research Corp. Fluke Corporation Guildline Instruments Hewlett-Packard Co. Julie Res. Lab. Inc. Keithley Instruments, Inc. Measurements International Ltd. Canada QuadTech Inc. Quantum Design Inc. Rotek Instrum. Corp. Tegam Inc. Tektronix Inc
Starting Page	3087
Ending Page	3092
Page Count	6
File Size	445588
File Format	PDF
ISSN	00189456
Volume Number	62
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Inspection Thin film transistors Glass Liquid crystal displays Production O/Optical signal detection I/Image classification I/Image processing L/Liquid crystal displays L/Liquid crystals
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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