Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1996-04-09
1998-12-22
Bayerl, Raymond J.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 88, G09G 336
Patent
active
058524304
ABSTRACT:
A temperature detection circuit and two RAMs are connected to a conversion circuit for converting image data into voltage designation signals and outputting the signals to a signal electrode driver. The temperature detection circuit detects the temperature of a liquid crystal display element as one of conditions which influence the behavior of liquid crystal molecules. One RAM is used to store a conversion table in which voltage designation signals for designating effective voltage to be applied to a liquid crystal layer are preset for image data for each predetermined temperature range of the liquid crystal display element. The other RAM is used to store input image data. In the conversion table, the number of different voltage designation signals in a high-temperature range is set to be smaller than that of different voltage designation signals in a normal temperature range. The conversion circuit reads out voltage designation signals in accordance with a detection signal from the temperature detection circuit and image data, and outputs the signals to the signal electrode driver. With this operation, effective voltages corresponding to the voltage designation signals are applied to the liquid crystal layer, and a color display with excellent perceptibility can always be obtained regardless of the temperature of the liquid crystal display element.
REFERENCES:
patent: 4923285 (1990-05-01), Ogino et al.
patent: 5471229 (1995-11-01), Okada et al.
Bayerl Raymond J.
Casio Computer Co. Ltd.
Luu Matthew
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