Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-03-06
1997-12-23
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345197, 377 78, G09G 300
Patent
active
057011362
ABSTRACT:
A shift register for scanning a liquid crystal display includes cascaded stages. A given stage is formed with an input transistor switch that is responsive to an output pulse of a stage upstream in the chain of the cascaded stages. An output pulse of the given stage is produced in a pull-up transistor of a push-pull amplifier. A pull-down transistor is responsive to a control signal that tracks a variation of a threshold voltage of the pull-down transistor. A difference between the control signal and the threshold voltage is maintained small in a manner to reduce a change in a conductivity of the pull-down transistor when a drift in the threshold voltage of the pull-down transistor occurs.
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Dingwall Andrew Gordon Francis
Huq Ruquiya Ismat Ara
Acosta Joseph
Henig Sammy S.
Hjerpe Richard
Laks Joseph J.
Thomson Consumer Electronics S.A.
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