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Generation of Disclination Line Dependent on Liquid Crystal's Pretilt Angle in Liquid-Crystal-on-Silicon Devices

Liquid-Crystal-on-Silicon 소자에서 액정의 프리틸트각에 따른 Disclination Line 발생

  • 정태봉 (전북대학교 신소재공학부) ;
  • 오세태 (클라이언트 연구개발부) ;
  • 이승희 (전북대학교 신소재공학부)
  • Published : 2003.04.01

Abstract

We have studied how surface pretilt angle affects generation of disclination line in liquid-crystal-on silicon cells for 45$^{\circ}$-twisted nematic (TN) and vertical alignment (VA) modes with pixel size of 15$\mu\textrm{m}$. Our studies show that when the pretilt angle is increased from 0$^{\circ}$to 3$^{\circ}$ in the 45$^{\circ}$-TN cell, the disclination line at left side of on-pixel becomes weak and is well suppressed with $\theta$$\_$p/=3$^{\circ}$ although the pixel size Is decreased. In the VA cell, when the pretilt angle is decreased from 89$^{\circ}$ to 86$^{\circ}$, the disclination line at right side of the on-pixel is suppressed well and even for a smaller pixel size, it does not exist when $\theta$$\_$p/=86$^{\circ}$. The results inform that the pretilt angle strongly affects the image quality of microdisplays.

Keywords

Liquid-crystal-on-silicon(LCoS);Disclination line;Pretilt angle;TN;VA

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