Liquid crystal display device

Details Liquid crystal display device Liquid crystal display device

G - Physics

02

F

345/8

G02F 1/133 (2006.01) C09K 19/02 (2006.01) G02F 1/137 (2006.01)

Patent

CA 1205170

12 ABSTRACT "Liquid crystal display device" In a matrix display device having a cholesteric liquid crystal the bistability effect is used which some cholesteric liquid crystals show. The liquid crystal shows a frequency-dependent relaxation of a positive to a negative dielectric anisotropy. After writing the information the light-scattering picture elements have a focal-conical texture and the transparent elements have a homeotropic-nematic texture. The information can be stored for a longer period of time by causing the homeotropic-nematic texture of the transparent elements to change into the substantially transparent planar- conical texture. This is produced rapidly by applying across all picture elements a voltage of a frequency at which the liquid crystal has a negative dielectric anisotropy. The focal-conical texture of the light- scattering elements is substantially not disturbed by said voltage. During the presence of said voltage the written information is continuously visible.

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