Signal processing circuit and liquid crystal display apparatus u

Details Signal processing circuit and liquid crystal display apparatus u Signal processing circuit and liquid crystal display apparatus u

1996-12-12

1999-03-30

Chin, Wellington

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 87, 345100, 345101, 345208, G09G 336

Patent

active

058895035

ABSTRACT:
A signal processing circuit is disclosed in which the DC level of a signal having constant signal value periods during each of non-inverting periods and inverting periods can be correctly adjusted. The circuit has first and second sample-and-hold sections which perform sample-and-hold operations on the signal value which occurs during the constant signal value periods of the non-inverting and inverting periods. An averaging section averages the sample-and-hold values of the sample-and-hold sections. A feedback section compares the output value of the averaging section with a reference value and, upon comparison, feeds back the resulting value to the signal processing section. Also disclosed is a liquid crystal display apparatus using the above-described signal processing circuit.

REFERENCES:
patent: 4686562 (1987-08-01), Yamanaka
patent: 4701786 (1987-10-01), Yamanaka
patent: 4821087 (1989-04-01), Honjo
patent: 4859871 (1989-08-01), Kobayaski et al.
patent: 5142354 (1992-08-01), Susuki et al.
patent: 5283477 (1994-02-01), Shibata
patent: 5296929 (1994-03-01), Morimoto
patent: 5302860 (1994-04-01), Fischer et al.

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