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http://dx.doi.org/10.4313/JKEM.2008.21.5.474

Full Color Reflective Cholesteric Liquid Crystal using Photosensitive Chiral Dopant  

Park, Seo-Kyu (충남대학교 바이오응용화학부 고분자공학과)
Kim, Jeong-Soo (충남대학교 바이오응용화학부 고분자공학과)
Cho, Hee-Suck ((주)엔디스 차세대디스플레이연구소)
Kwon, Soon-Bum ((주)엔디스 차세대디스플레이연구소)
Reznikov, Yuri (우크라이나 물리연구소)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.21, no.5, 2008 , pp. 474-480 More about this Journal
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;
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