Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1997-07-25
1999-02-16
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349 86, G02F 11337
Patent
active
058726098
ABSTRACT:
In a light control element whose reflection factor or transmission factor varies in response to an external stimulus such as voltage by having layer structure in which the refractive index varies periodically, design is made such that the difference in refractive index between adjacent layers in a reflected state becomes sufficiently great and the halfamplitude level of reflection spectrum becomes sufficiently high. A light control layer is interposed between supporting plates, and the light control layer is obtained by alternately laminating a nonsensitive layer and a sensitive layer in the Z-axis direction. In the nonsensitive layer, the oriented direction of the liquid crystal is fixed in the X-axis direction, while in the sensitive layer, the liquid crystal is oriented in the X-axis direction. On the supporting plate, a pair of electrodes and facing to each other in the Y-direction are so formed as to extend in a striped shape in the X-axis direction respectively. When voltage is applied between electrodes, the oriented direction of the liquid crystal in the sensitive layer changes into the Y-axis direction.
REFERENCES:
Crawford et al., Reflective Color Displays For Imaging Applications, SID, 52-57, 1995.
Date et al., Three-Primary-Color Holographic Polymer Dispersed Liquid Crystal (HPDLC) Devices For Reflective Displays, 603-607, 1995.
Tanaka et al, Optimization Of Holographic PDLC For Reflective Color Display Applications, 267-270, SID, 1995.
Tanaka et al, A Liquid-Crystal/Polymer Optical Device Formed By Holography For Refective Color Display Applications, 109-111.
Hiji Naoki
Hikichi Takehito
Yamamoto Shigeru
Dudek James A.
Fuji 'Xerox Co., Ltd.
Sikes William L.
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