Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1998-08-07
1999-07-06
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349146, 349115, 349176, G02F 11333
Patent
active
059203641
ABSTRACT:
A cholesteric liquid crystal display device with improved display images is provided. The device includes a transparent front plate (16) with a front conductive film (18) spaced apart from a back conductive film (22) by a gap filled with cholesteric liquid crystal material (24) which can be switched between a transparent state and a reflective state through application of an electric field. The front conductive film (18) is coated with an opaque mask which defines openings (36) for transmitting light. In the reflective state, ambient light entering the device (10) is reflected by the cholesteric liquid crystal (24) through openings (36) in the opaque mask (12) to form a bright image. In the transparent state, ambient light entering the device (10) passes through the cholesteric liquid crystal (24), front film (18) and back film (22) and is substantially absorbed by an underlying opaque layer (14) which is preferably color-matched to the internal mask (12) to form an single color, image-free display area.
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Akins Robert
Ventouris George M.
Fekete Douglas D.
Hodge Heather R.
Hollingshead Robert J.
Motorola Inc.
Sikes William L.
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