Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-03-24
1997-12-16
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345100, 345 94, G09G 300
Patent
active
056990740
ABSTRACT:
A front-lit, non-gray scale liquid crystal display device (10) including a polymer stabilized cholesteric liquid crystalline material has two optical states stable in the absence of an electric field. In a reflecting optical state incident illumination is directly reflected by the liquid crystal, producing a light pixel. In a scattering optical state incident illumination is absorbed by a black surface on the rear of the display, producing a dark pixel. A method employing a plurality of display control signals having the same polarity and differing phase relationships permits the fast video response of the display, notwithstanding that the average time to switch from a scattering optical state to a reflecting optical state is about 30 milliseconds, requiring about fifteen seconds to update a typical 480-row liquid crystal display using conventional array sequencing techniques. Several routines are presented for determining when to update such a display for a variety of applications.
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Four page article published in Proceedings of the Society For Information Display Digest of Technical Papers entitled "Cholesteric Liquid Crystal/Polymer Gel Dispersion: Reflective Display Application" by D.K. Yang and J.W. Doane, published 1992.
Four page article from Japan Display '92 entitled "Front-Lit Flat Panel Display from Polymer Stabilized Cholesteric Textures" by J.W. Doane, D.K. Yang and Z. Yaniv, published 1992.
O'Hagan Timothy P.
Sutherland Jeffrey W.
Hjerpe Richard
Osorio Ricardo
Teletransaction, Inc.
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