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Article

Research Paper

Journal of the Optical Society of Korea 2012; 16(4): 409-413

Published online December 25, 2012 https://doi.org/10.3807/JOSK.2012.16.4.409

Copyright © Optical Society of Korea.

Dark-state Color Shift and Gray Scale Inversion in an In-plane Switching Liquid Crystal Display Device

Sung Il Park1, Kyoung-Ho Park1, Joun-Ho Lee1, Jeong Hwan Yoon1, Byeong Koo Kim1, Byeong-Hun Yu2, Ki-Han Kim2, and Tae-Hoon Yoon2

1IT/Mobile Development Group, LG Display Co., Ltd.; 2Department of Electronics Engineering, Pusan National University

Received: August 8, 2012; Revised: September 17, 2012; Accepted: October 5, 2012

Abstract

Off-axis color shift in the dark state and gray scale inversion in an in-plane switching (IPS) liquid crystal display (LCD) device were investigated. Analyses were performed using the Poincar$\acute{e}$ sphere representation. The results show that color shift in the dark state and gray scale inversion in an IPS LCD can be reduced by using a biaxial film. We confirmed the extent of these improvements by measuring the optical performance of a fabricated IPS LCD.

Keywords: Liquid crystal, In-plane switching, Color shift, Gray inversion, Poincar$acute{e}$ sphere,

OCIS codes: 160.3710; 120.0120; 120.2040