2004•Japanese Journal of Applied PhysicsOpen access

Optical Compensation Method for In-plane Switching Twisted Nematic Mode

Shinichirou Oka, Kazuya Kobayashi, Yoshihisa Iwamoto, Yasuo Toko, M. Kimura, Tadashi Akahane

Abstract

We have proposed an in-plane switching twisted nematic (IT) mode. The characteristics of the IT mode are the wide viewing angle, the narrow cell gap error tolerance, and the relative fast response time. However, an IT mode needs a high electric field to obtain a high contrast ratio. To improve this situation, we propose a compensation method using a twisted nematic liquid crystal (LC) film or a twisted discotic LC film. Specifically, the latter can achieve the wide viewing angle, the high contrast ratio and the decrease in the driving voltage. In this paper, a compensation method using a film is suggested and evaluated by numerical calculation.

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Key concepts: Liquid crystal, Contrast ratio, Compensation (psychology), Electric field, Materials science, Viewing angle, Optics, Mode (computer interface)