Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1994-06-21
1997-10-14
Saras, Steven
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345100, 345210, G09G 336
Patent
active
056777051
ABSTRACT:
The object of the invention is to provide a drive method suitable for driving a fast-responding STN liquid crystal display device which ensures a minimized cross talk and improved contrast in display. The drive method comprises a memory means for storing display data corresponding to a plurality of lines, a function generating means for generating a drive function for the row electrodes, an arithmetic means for computing the outputs from the foregoing means, a column electrode drive means for driving the column electrodes in dependency on the output from the arithmetic means, and a row electrode drive means for driving the row electrodes in accordance with respective row electrode drive functions. As a voltage function to be applied to each row during drive operation, a sum of a plurality of orthogonal functions is utilized. Thereby, degradation in contrast due to display patterns as well as the cross talk can be minimized. Further, arithmetic operation can be simplified in gradation display since application of a compensating voltage waveform is no more required.
REFERENCES:
patent: 3668639 (1972-06-01), Harmuth
"New Adressing Techniques For Multiplexed Liquid Crystal Displays" by T.N. Ruckmongathan, SID, vol. 24/3 1983.
1988 International Display Research Conference by T.N. Ruekmongathan, 1988 IEEE.
"Ultimate Limits for Matrix Addressing of RMS-Responding LCD" IEEE Transactions on Electron Devices, vol. ED-26, No. 5, May 1989, pp. 795-802.
"Active Addressing Method for High-contrast Video-Rate STN Displays" SID '92 Digest.
"Hardware Architectures for Video-Rate, Active Addressed STN Displays", Japan Display '92, pp. 503-506.
Fujii Tatsuhisa
Kitajima Masaaki
Kondo Katsumi
Kurihara Hiroshi
Nishitani Shigeyuki
Hitachi , Ltd.
Saras Steven
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