Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Patent
1995-04-14
1996-07-02
Hjerpe, Richard
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
345205, 345 89, G09G 500
Patent
active
055327184
ABSTRACT:
A semiconductor integrated circuit device comprises a reference voltage generating circuit for transforming a power-supply voltage at multiple levels on the basis of a voltage specifying signal outputted from a CPU, a driving voltage generating circuit to which a reference voltage generated from the reference voltage generating circuit is given, and a liquid-crystal display control circuit for outputting a driving signal for driving a liquid-crystal display panel when the voltage generated from the driving voltage generating circuit is given. Since the device of the present invention can perform the contrast control based on the above voltage specifying signal, it becomes unnecessary to provide an additional contrast control circuit outside the device, unlike the conventional device. Moreover, with the constitution which enables an output voltage of the above reference voltage generating circuit to be provided to the outside, the device of the present invention becomes more versatile with respect to various products.
REFERENCES:
patent: 4742346 (1988-05-01), Gillette et al.
patent: 5027036 (1991-06-01), Ikarashi et al.
patent: 5162786 (1992-11-01), Fukuda
patent: 5170155 (1992-12-01), Plus et al.
patent: 5343221 (1994-08-01), Arakawa et al.
Donald L. Schilling, "Electronic Circuits Discrete and Integrated", 1979, McGraw-Hill, Inc. pp. 708-711.
Hjerpe Richard
Mitsubishi Denki & Kabushiki Kaisha
Wu Xiao M.
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