Ferroelectric liquid crystal device for gray scale display, gray

Details Ferroelectric liquid crystal device for gray scale display, gray Ferroelectric liquid crystal device for gray scale display, gray

1995-12-28

1997-09-23

Bovernick, Rodney B.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349 85, 349122, 349142, 349173, G02F 11333, G02F 11343, G02F 113

Patent

active

056710321

ABSTRACT:
A ferroelectric liquid crystal display device, and a gray scale display apparatus and method adopting the liquid crystal display device. In the ferroelectric liquid crystal display device, the region of a pixel is divided into a plurality of sub-regions having a predetermined size and a dielectric layer is formed on top of or beneath each transparent electrode of the divided sub-regions in the same thickness, wherein the permittivity of the dielectric layers is similar and the optical transmittance thereof is different, or both permittivity and optical transmittance of the dielectric layers are different. Then, the state of the ferroelectric liquid crystal corresponding to a specific sub-region is changed using a voltage sharing method adopting the principle of voltage drop by resistance. As a result, the transmittance of each divided sub-region can be different relatively, so that the gray scale display can be achieved with the further fractionized gray scale levels.

REFERENCES:
patent: 5257122 (1993-10-01), Dibal et al.
patent: 5325106 (1994-06-01), Bahraman
patent: 5519520 (1996-05-01), Stoller

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