Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1996-07-10
1998-03-17
Wu, Xiao
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345211, G09G 336
Patent
active
057292469
ABSTRACT:
A drive circuit for a liquid crystal display device, includes: an operational amplifier supplied at one input terminal with display data used for liquid crystal display; a capacitor connected between the other input terminal of the operational amplifier and the external output terminal; and, e.g., a first switching element provided at the input side of the operational amplifier and supplied with a first voltage, a second switching element connected to the external output terminal at the output side of the operational amplifier and supplied with a second voltage and a third switching element provided between the output terminal of the operational amplifier and the external output terminal. The drive circuit further includes a switch control circuit connected to the switching elements, and operative to allow the first and second switching elements to be turned ON for a first time period within each liquid crystal display cycle to produce a predetermined potential difference across the both ends of the capacitor, and to allow them to be turned OFF for a second time period within the liquid crystal display cycle, and further operative to allow the third switching element to be turned OFF for the first time period, and to allow it to be turned ON for the second time period to thereby output, from the external output terminal, for the second time period, a voltage obtained by adding the predetermined potential difference and a voltage on the output terminal of the operational amplifier.
REFERENCES:
patent: 4570115 (1986-02-01), Misawa et al.
patent: 5229761 (1993-07-01), Fuse
patent: 5453757 (1995-09-01), Date et al.
patent: 5489910 (1996-02-01), Kuwata et al.
patent: 5517212 (1996-05-01), Inoue
Kabushiki Kaisha Toshiba
Wu Xiao
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