Liquid crystal cells – elements and systems – With specified nonchemical characteristic of liquid crystal... – Within cholesteric phase
Patent
1998-04-10
1999-12-21
Sikes, William L.
Liquid crystal cells, elements and systems
With specified nonchemical characteristic of liquid crystal...
Within cholesteric phase
349104, 349106, 349110, 349158, G02F 11333, G02F 1137
Patent
active
060056541
ABSTRACT:
The invention concerns a liquid crystal display device intended, in particular, to form a colour image display screen, of the type including: a first substrate which is transparent on a front side situated on the side of the viewer; and a second substrate arranged on a back side facing the first substrate and extending parallel to the latter. The first substrate is connected to the second substrate in order to delimit between them a cavity in which at least one film of liquid crystal is arranged. The liquid crystal has at least a first state in which it reflects the light of a range of wavelengths of a predetermined colour and at least a second state in which it is transparent. The surface of each substrate facing the other substrate includes electrodes to allow the liquid crystal to pass at least from the first state to the second state or conversely, by selective application of a control voltage to the electrodes. The liquid crystal display includes a filter absorbing at least the visible neighbouring wavelengths of the range of wavelengths of the predetermined colour and the closest to the wavelength 555 nm with the exception of the wavelengths of said predetermined colour. The filter is arranged on the side of the viewer with respect to the film of liquid crystal.
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patent: 5737045 (1998-04-01), Abileah
G.P. Crawford: "Liquid Crystal in complex Geometries", Taylor & Francis, 1996 XP002041494 pp. 255-264, Chapter 11.2 Reflective Cholesteric Display.
Klimusheva G V et al: "External factor influence on the optical activity of chiral liquid crystals" Nonlinear Optics of Liquid and Photorefractive Crystals, Crimea.
Ukraine, Oct. 23-30 1995, vol. 2795, ISSN 0227-786X, Proceedings of the SPIE--The Int. Society For Optical Eng., 1996, SPIE-Int. Soc. Opt. Eng, USA. pp. 50-55.
Grupp Joachim
Herzig Hans Peter
Kipfer Peter
Klappert Rolf
Asulab S.A.
Duong Tai V.
Sikes William L.
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