Ramp signal producing method, ramp signal producing apparatus, a

Details Ramp signal producing method, ramp signal producing apparatus, a Ramp signal producing method, ramp signal producing apparatus, a

1997-04-02

1999-08-10

Brier, Jeffery

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 63, 345 94, 345 98, 345147, 348687, G09G 328, G09G 336, G09G 510, H04N 557

Patent

active

059366028

ABSTRACT:
In a ramp signal producing apparatus, a ramp signal is produced under low clock signal frequency in a compact circuit arrangement. Luminance control and a white balance control are carried out by the ramp signal in a liquid crystal display. The ramp signal producing apparatus is comprised of: an up/down counter for either counting up, or counting down a clock signal supplied thereto; amplitude amount converting means for converting the amplitude of the supplied clock signal into such an amplitude value corresponding to the count value of the up/down counter and for converting the amplitude value in such a manner that a change amount per one count value is increased during the count down operation by the up/down counter; and ramp signal producing means for producing such a ramp signal with an amplitude corresponding to the converted amplitude value.

REFERENCES:
patent: 4223351 (1980-09-01), Tsujimura et al.
patent: 4642694 (1987-02-01), Yamagishi et al.
patent: 5317401 (1994-05-01), Dupont et al.
patent: 5414443 (1995-05-01), Kanatani
patent: 5450212 (1995-09-01), Asada
patent: 5459418 (1995-10-01), Uriya et al.
patent: 5708453 (1998-01-01), Tsuchida et al.

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