Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Patent
1993-06-25
1994-08-30
Hjerpe, Richard
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
345 87, G09G 300
Patent
active
053432215
ABSTRACT:
A plurality of resistors serially connected with each other between a maximum voltage level "V" and a minimum voltage level "0" are provided to generate voltage-divided intermediate voltage levels "V2H", "V1H", "V3L", "V2L", the voltages having the voltage-divided intermediate voltage levels being supplied to a first group of operational amplifiers whose first stage input portions are formed of N-channel MOSFETs and a second group of operational amplifiers whose first stage input portions are formed of P-channel MOSFETs. Frame signal FR for alternating-current-driving a liquid crystal display device is supplied to the operational amplifiers. When signal FR is in a state "0", the first group of operational amplifiers are brought into an active state while the second group is brought into an inactive state. When signal FR is in a state "1", the first group of operational amplifiers are inactive. Under the condition that power down signal PD for non-use of the liquid crystal display device is generated, all of the operational amplifiers are controlled to be in an inactive state.
REFERENCES:
patent: 4050064 (1977-09-01), Hashimoto et al.
patent: 4769639 (1988-09-01), Kawamura et al.
patent: 4781437 (1988-11-01), Shields et al.
patent: 4859870 (1989-08-01), Wang et al.
Arakawa Takashi
Motegi Hiroyuki
Hjerpe Richard
Kabushiki Kaisha Toshiba
Nguyen Chanh
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