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Optimization of polymer‐stabilized bistable black‐white cholesteric reflective display
Author(s) -
Ma RuiQing,
Yang DengKe
Publication year - 1999
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.1985272
Subject(s) - materials science , texture (cosmology) , optics , planar , liquid crystal , cholesteric liquid crystal , bistability , perpendicular , light scattering , liquid crystal display , conic section , scattering , optoelectronics , physics , geometry , computer science , mathematics , computer graphics (images) , artificial intelligence , image (mathematics)
— Cholesteric liquid crystals at zero field exhibit two optically contrasting stable states: planar texture and focal‐conic texture. When a cholesteric liquid crystal is in the planar texture, the helical axis is perpendicular to the cell surface; the material Bragg‐reflects colored light. When the liquid crystal is in the focal‐conic texture, the helical axis is more or less parallel to the cell surface; the material is forward‐scattering and has a black appearance if the back plate of the cell is painted black. We develop a cholesteric liquid‐crystal/polymer composite in which a small amount of polymer is dispersed in the liquid crystal. The dispersed polymer changes the planar texture to a poly‐domain structure, which has a white appearance but has little effect on the optical properties of the focal‐conic texture. The result is a bistable black‐white reflective display which is a good candidate for electronic‐paper applications.