Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1995-09-28
1996-12-31
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349 89, 349184, G02F 11333, G02F 113
Patent
active
055899595
ABSTRACT:
An optical modulation device is described, which comprises two substrates, which are provided with at least one electrode, and an optically active layer situated between said two substrates, the optically active layer comprising a liquid crystalline material having ferroelectric, antiferroelectric or electroclinic properties. In accordance with the invention, the device is characterized in that the optically active layer comprises a permanently oriented anisotropic network of polymerized material containing free molecules of a chiral liquid crystalline material. Said network is preferably composed of a polymer formed from reactive monomers comprising at least two reactive groups on the basis of acrylates, methacrylates, epoxy compounds and/or thiolene systems. By means of such an optical modulation device grey levels which can be passively maintained for a relatively long period of time can be obtained in a relatively simple manner. In addition, the device in accordance with the invention is little sensitive to shocks. Besides, the device in accordance with the invention can be constructed so as to comprise a relatively thick optically active layer, without the occurrence of a disturbing loss of contrast caused by "chevrons".
REFERENCES:
patent: 4981340 (1991-06-01), Kurematsu et al.
patent: 5056898 (1991-10-01), Ma et al.
patent: 5188760 (1993-02-01), Hikmet et al.
patent: 5194973 (1993-03-01), Isogai et al.
patent: 5204763 (1993-04-01), Hikmet
patent: 5206747 (1993-04-01), Wiley et al.
patent: 5216530 (1993-06-01), Pearlman et al.
patent: 5262882 (1993-11-01), Hikmet
patent: 5303073 (1994-04-01), Shirota et al.
patent: 5305126 (1994-04-01), Kobayashi et al.
patent: 5321533 (1994-06-01), Kumar
patent: 5333074 (1994-07-01), Hikmet
patent: 5434685 (1995-07-01), Pirs et al.
patent: 5490001 (1996-02-01), Konuma
"Ferroelectric Liquid Crystal Displays for Television Application" Ferroelectronics, 1991, vol. 122, pp. 1-26 Wilbert J. A. M. Hartmann.
Miller Charles
Schmitt Michael E.
Sikes William L.
U.S. Philips Corporation
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