Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-09-26
1997-02-18
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 88, 348674, G09G 504
Patent
active
056045115
ABSTRACT:
An active matrix liquid crystal display apparatus comprises a liquid crystal panel having a plurality of pixel electrodes, a vertical driver circuit and upper and lower horizontal driver circuits for driving the liquid crystal panel. A sample hold circuit receives a video signal for level-shifting, amplifying and holding the received video signal and outputs a reduced frequency signal, and a gamma conversion circuit receives an output of the sample hold circuit for gamma-converting the received signal. A data inverting circuit receives an output of the gamma conversion circuit for selectively generating a data signal inverted in comparison with a predetermined constant voltage and a non-inverted data signal. A controller controls vertical driver circuit, the upper and lower horizontal driver circuits, the sample hold circuit, the gamma conversion circuit and the data inverting circuit. The data signals in the same phase or in an opposite phase are supplied to the upper and lower horizontal driver circuits, respectively.
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Hjerpe Richard
Lao Lun-Yi
NEC Corporation
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