DOI QR코드

DOI QR Code

Study of Liquid Crystal Device using a High Thermal Photopolymer

고내열성 광폴리머 표면을 이용한 액정 표시 소자 연구

  • 황정연 (연세대학교 전기전자공학과) ;
  • 남기형 (연세대학교 전기전자공학과) ;
  • 이상민 (한양대학교 공업화학과) ;
  • 서대식 (연세대학교 전기전자공학과) ;
  • 김재형 (인제대학교 컴퓨터 응용과학과) ;
  • 서동학 (한양대학교 공업화학과)
  • Published : 2004.01.01

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.

References

  1. Mol. Cryst. Liq. Cryst. v.213 Generation of pretilt angle in nematic liquid crystal, 5CB, media aligned polyimide films prepared by spin-coating and LB techniques : effect of rubbing D.S.Seo;K.Muroi;S.Kobayashi https://doi.org/10.1080/10587259208028733
  2. Jpn. J. Appl. Phys. v.33 no.8B Effects of conjugation of mesogenic core of nematic liquid crystals for polar anchoring energy and surface order parameter on rubbed polyimide films D.S.Seo;N.Yoshida;S.Kobayashi;M.Nishikawa;Y.Yabe https://doi.org/10.1143/JJAP.33.L1174
  3. Jpn. J. Appl. Phys. v.32 no.7 Surface-induced parallel alignment of liquid crystals by linearly polarized photopolymers M.Schadt;K.Schmitt;V.Kozinkov;V.Chigrinov
  4. Macromolecules v.4 no.30 Photoreactivity of polymers with regioisomeric cinnamate side chains and their ability to regulate liquid crystal alignment K.Ichimura;Y.Akita;H.Akiyama;K.Kudo;Y.Hayashi
  5. 전기전자재료학회논문지 v.13 no.2 새로운 광중합법을 이용한 광 배향 TN-LCD의 전기 광학 특성 황정연;서대식
  6. 전기전자재료학회논문지 v.15 no.3 3가지 종류의 치환기를 함유한 N-(phenyl)maleimide계 광폴리머 표면을 이용한 액정 배향 효과에 관한 연구 황정연;이윤건;서대식;김준영;김태호 https://doi.org/10.4313/JKEM.2002.15.3.264
  7. Appl. Phys. Lett. v.69 Response mechanism of nematic liquid crystal using the in-plane switching mode M.Oh-e;K.Kondo https://doi.org/10.1063/1.117927
  8. IDW'97 A vertically aligned LCD providing super-high image quality Y.Koike;S.Kataoka;T.Sasaki;H.Chida;A.Takeda;K.Ohmuro;T.Sasabayashi;K.Okamoto
  9. Jpn. J. Appl. Phys. v.39 Viewing angle characteristics using a patterned double twisted vertical-alignment cell mode D.S.Seo;J.Y.Hwang https://doi.org/10.1143/JJAP.39.L914
  10. 전기전자재료학회논문지 v.13 새로운 VA-1/6π 셀 모드를 이용한 광시야각 특성 황정연;서대식;한은주;김재형