| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 분자전자 부문위원회 |
| 제목 | Synthesis and Characterization of a Photosensitive Liquid Crystal Alignment Layer for a Vertically Aligned Mode |
| 초록 | Polyimide has been widely used as a material for electro-optic devices on their own advantages such as excellent thermal property, good mechanical property and electrical property, etc. In this study, we have synthesized a poly(amic acid) from a photosensitive diamine and an alicyclic dianhydride, which can be used as a photo alignment layer for vertically alignment mode. The poly(amic acids) were synthesized from cyclobutane -1,2,3,4-tetracarboxylic dianhydride [CBDA], 4,4`-diaminodiphenylmethane [MDA] and a photosensitive diamine prepared from trans-3-phenyl acryloyl chloride in NMP. We have investigated electro-optic properties of liquid crystal display cells fabricated with the photo-aligned films, such as a voltage holding ratio (VHR), a residual direct current voltage (RDC voltage) and a pretilt angle. The voltage holding ratio and the residual direct current voltage were about 98% and less than 50 mV, respectively. The pretilt angle was about 89o~ 90o at voltage off state. Further, we`ll discuss the liquid crystals alignability and change of the pretilt angle after the photo-irradiation . Fig 1. Optical microscope images of LC cells. (a) after the rubbing treatment (b) after the photo-irradiation at 220~480 nm with an exposure dose of 6J, (c) after the photo-irradiation at 220~480 nm with an exposure dose of 6J. |
| 저자 | 이미라1, 이윤정2, 정영식1, 원종찬1, 홍성권3, 이미혜1 |
| 소속 | 1한국화학(연), 2LG 화학 기술원, 3충남대 |
| 키워드 | liquid crystal; photo alignment layer; polyamic acid |
