1987-02-19
1989-05-30
Miller, Stanley D.
350341, 350344, 350348, 350351, G02F 113
Patent
active
048345008
ABSTRACT:
A thermochromic liquid crystal display comprises a layer of short pitch cholesteric liquid crystal material between two walls. An absorber covers the back of the rear wall. At least one wall is surface profiled with a fine grating to align the liquid crystal material. Typically the grating pitch is 0.05 to 12 .mu.m. The profile may be fine on one wall e.g. 0.05 to 12 .mu.m pitch, 0.1 .mu.m depth and coarse e.g. 125 .mu.m pitch groove width 100 .mu.m, depth 10 .mu.m on the other wall. The cholesteric pitch is arranged to give the desired a selective reflection of light whereby the display is observed to change color with temperature. Using thin flexible walls small displays may be cut from large sheets of embossed polyester plastic materials.
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Hilsum Cyril
Kerr Kyle E. N.
McDonnell Damien G.
Duong Tai Van
Miller Stanley D.
The Secretary of State for Defence in Her Britannic Majesty's Go
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