Contrast adjustment circuit for liquid crystal display

Details Contrast adjustment circuit for liquid crystal display Contrast adjustment circuit for liquid crystal display

1994-08-02

1996-05-14

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

345 89, 345212, G09G 500

Patent

active

055172121

ABSTRACT:
A contrast adjustment circuit for a liquid crystal display which is connected, when to be used, to an electronic apparatus such as a computer. The contrast adjustment circuit comprises an adjustment voltage supply circuit provided in an electronic apparatus, a reference voltage generation circuit provided in the liquid crystal display for generating a reference voltage substantially equal in absolute value to a contrast peak voltage of the liquid crystal display, and an operational amplifier for comparing the reference voltage and an adjustment voltage and supplying a voltage difference between the reference voltage and the adjustment voltage to a driving voltage input terminal of the liquid crystal display.

REFERENCES:
patent: 4141002 (1979-02-01), Reinhold
patent: 4348666 (1982-09-01), Ogita
patent: 4427978 (1984-01-01), Williams
patent: 4570115 (1986-02-01), Misawa et al.
patent: 4769639 (1988-09-01), Kawamura et al.
patent: 5229761 (1993-07-01), Fuse

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