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Proceedings Paper

Multiple-functional and cost-effective liquid-crystal cell parameter measurement system
Author(s): Gao-Wei Chang; Yu-Hsuan Lin; Zong-Mu Yeh
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Paper Abstract

For years, the technology of TFT-LCDs (thin-film-transistor liquid crystal displays) has grown very rapidly, especially in the market share and technical development of FPD industries. To effectively promote the industry's capacity for the mass production and quality control, it is urgent to design and develop LC cell optical parameter measurement systems. The goal of this paper is to develop a multiple-functional and cost-effective measurement system to lower the manufacturing cost for the industry. The optical parameters includes the pretilt angle, liquid crystal (LC) cell gap (or phase retardation), and twist angle, which highly influence the display quality. In this paper, we first study the past approaches and analyze their measurement performance. Then, a simple and cost-effective method is proposed to achieve the multiple functions. That is, in addition to the precise measurement of the three important optical parameters, the proposed system can measure the voltage-transmittance (V-T) curve. In our approach, the theoretical study, simulation, and experiment are performed to show the feasibility of the system implementation. Finally, the proposed system is developed to automatically measure the LC cell parameters. Experimental results indicate that the proposed measurement system gives a satisfactory result.

Paper Details

Date Published: 12 February 2007
PDF: 12 pages
Proc. SPIE 6487, Emerging Liquid Crystal Technologies II, 64870Z (12 February 2007); doi: 10.1117/12.700071
Show Author Affiliations
Gao-Wei Chang, National Taiwan Normal Univ. (Taiwan)
Yu-Hsuan Lin, National Taiwan Normal Univ. (Taiwan)
Zong-Mu Yeh, National Taiwan Normal Univ. (Taiwan)

Published in SPIE Proceedings Vol. 6487:
Emerging Liquid Crystal Technologies II
Liang-Chy Chien, Editor(s)

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