Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1994-08-30
1998-02-10
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 90, 345 97, G02F 1133
Patent
active
057174180
ABSTRACT:
A new and improved ferroelectric liquid crystal display system having a matrix structure of pixel elements each including a transistor active switching device and a ferroelectric cell. Each switching device is coupled to an individual storage capacitor which is charged during each row select time when the switching device is activated, and which is discharged during each frame time when the switching device is deactivated. A plurality of multi-level or analog column drivers supply selected drive currents to charge individually the storage capacitors of a row of pixel elements to desired initial voltage levels corresponding to desired gray scale levels for the pixel elements during a row select time to maintain the liquid crystal pixel images for lengths of time proportional to the initial charge levels of the capacitors, which discharge until their individual voltages reach a threshold voltage within predetermined discharge times during one frame time.
REFERENCES:
patent: 4766430 (1988-08-01), Gillette et al.
patent: 5091722 (1992-02-01), Kitajima et al.
patent: 5250937 (1993-10-01), Kikuo et al.
patent: 5323172 (1994-06-01), Koden
patent: 5400044 (1995-03-01), Thomas
Shapiro Leonid
Shaw Robert W.
Fatahi-yar M.
Hjerpe Richard
Kleinke Bernard L.
Proxima Corporation
Scott Peter P.
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