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Proceedings Paper

Multi-domain vertical alignment of nematic liquid crystals for reduced off-axis gamma shift
Author(s): Tae-Hoon Yoon; Byung Wok Park; Ki-Han Kim; Hoon Kim; Ki-Chul Shin; Hee Seop Kim
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Paper Abstract

Several liquid crystal (LC) modes, such as twisted nematic, vertical alignment (VA), and in-plane switching, have been in competition with each other in the LC display market. Among them, the VA mode has been widely used because of the high contrast ratio. Since the LC molecules are aligned perpendicular to the substrate in the initial state, an excellent dark state can be obtained at normal viewing direction. However, effective phase retardation of LC layer at oblique viewing direction differs greatly from that at normal viewing direction. Thus, gamma distortion phenomenon occurs at oblique view direction. To reduce the gamma shift in the VA mode at oblique viewing direction, multi-domain VA modes were proposed. Although gamma shifts of these modes are smaller than that of the single domain VA mode, the problems still remain. Recently, several technologies for 8-domain alignment have been proposed to decrease the gamma shift at off-axis. However, additional driving circuits are required to realize the eight-domain structure. In this paper we report technologies for the multi-domain VA mode with no additional driving circuits. By using the proposed technologies, we can obtain the dual threshold voltage in each sub-pixel to realize the multi-domain VA mode with no decrease of contrast ratio.

Paper Details

Date Published: 5 March 2013
PDF: 7 pages
Proc. SPIE 8642, Emerging Liquid Crystal Technologies VIII, 86420D (5 March 2013); doi: 10.1117/12.2003295
Show Author Affiliations
Tae-Hoon Yoon, Pusan National Univ. (Korea, Republic of)
Byung Wok Park, Pusan National Univ. (Korea, Republic of)
Ki-Han Kim, Pusan National Univ. (Korea, Republic of)
Hoon Kim, Samsung Display Co. Ltd. (Korea, Republic of)
Ki-Chul Shin, Samsung Display Co. Ltd. (Korea, Republic of)
Hee Seop Kim, Samsung Display Co. Ltd. (Korea, Republic of)

Published in SPIE Proceedings Vol. 8642:
Emerging Liquid Crystal Technologies VIII
Liang-Chy Chien; Dick J. Broer; Vladimir Chigrinov; Tae-Hoon Yoon, Editor(s)

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