Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Study of Electro-Optical Characteristics on Photoalignment TN Cell using a High Thermal Photopolymer

고내열성 광폴리머 표면을 이용한 광배향 TN 셀의 전기광학 특성의 연구

  • 이휘원 (연세대학교 전기전자공학과) ;
  • 황정연 (연세대학교 전기전자공학과) ;
  • 남기형 (연세대학교 전기전자공학과) ;
  • 이면길 (한양대학교 응용화학공학과) ;
  • 서동학 (한양대학교 응용화학공학과) ;
  • 서대식 (연세대학교 전기전자공학과)
  • Published : 2004.05.06
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Abstract

We synthesized photoalignment material of high thermal resistance with hydroxyl aromatic polyimide, and studied the liquid crystal (LC) aligning capabilities on the photopolymer layers. Also, electro-optical (EO) performances for the twisted-nematic (TN)-liquid crystal display (LCD) photoaligned with linearly polarized UV exposure were investigated. A good LC alignment with UV exposure on the photopolymer surface can be obtained. However, the low pretilt angles were obtained below $1^{\circ}$. The Voltage-transmittance (V-T) curve without backflow bounce in the photoaligned TN cell with UV exposure was observed. The response time of photoaligned TN cell was measured about 24 ms. Finally, The photoaligned TN cell has few hysteresis, and shows the residual DC voltage that is less.

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