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A Defect Free Bistable C1 SSFLC Devices  

Wang, Chenhui (Liquid Crystal Institute, Kent State University)
Bos, Philip J. (Liquid Crystal Institute, Kent State University)
Publication Information
Journal of Information Display / v.4, no.1, 2003 , pp. 1-8 More about this Journal
Abstract
Recent progress in both low pretilt and high pretilt defect free C1 surface stabilized ferroelectric liquid crystal (SSFLC) devices is reviewed. First, by numerical calculation to investigate the balance between surface azimuthal anchoring energy and bulk elastic energy within the confined chevron layer geometry of C1 and C2, it is possible to achieve a zigzag free C1 state by low azimuthal anchoring alignment with a low pretilt angle. The critical azimuthal anchoring coefficient for defect free C1 state is calculated. Its relationship with elastic constant, chevron angle as well as surface topography effect are also discussed. Second, using $5^{\circ}$ oblique SiO deposition alignment method a defect free, large memory angle, high contrast ratio and bistable C1 SSFLC display, which has potential for electronic paper applications has also been developed. The electrooptical properties and bistability of this device have been investigated. Various aspects of defect control are also discussed.
Keywords
liquid crystal display; surface stabilized ferroelectric liquid crystal (SSFLC); zigzags; electronic paper;
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