Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)
- 2007.11a
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- Pages.394-395
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- 2007
Full color reflective cholesteric liquid cystal using photosensitive chiral dopant
감광성 도판트를 이용한 풀컬러 구현 가능 반사형 콜레스테릭 액정
- Park, Seo-Kyu (Chungnam National Univ.) ;
- Cho, Hee-Seok (NDIS Corporation) ;
- Kwon, Soon-Bum (Hoseo Univ.) ;
- Kim, Jeong-Soo (Chungnam National Univ.) ;
- Reznikov, Yu. (Institute of Physics)
- Published : 2007.11.01
Abstract
In order to make full color cholesteric displays, color filter-less R, G, B sub-pixel structured cholesteric LC cells have been studied. To make R, G, B colors, UV induced pitch variant chiral dopant was added to cholesteric LC mixtures. The concentration of the photo-sensitive chiral dopant was adjusted so that the initial state showed blue color and the color was changed from blue to green and red with increase of UV irradiation to the cholesteric cells. To prevent the mixing of R, G, B reflective sub-pixel liquid crystals, separation walls were formed using negative photo resister in boundary area between sub-pixels. Through the optimization of the material concentrations and UV irradiation condition, vivid R, G, B colors were achieved.
Keywords
- Photosensitive Chiral Dopant;
- Cholesteric Liquid Crystal;
- Color rendering;
- Bragg reflectance;
- Bistability