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

1996-02-13

1998-01-13

Powell, Mark R.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

341126, 345 84, 345 98, 345112, 345147, 377 45, 377118, 377125, H03K 1302

Patent

active

057084530

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: 3656148 (1972-04-01), Belchen et al.
patent: 3742482 (1973-06-01), Albrecht et al.
patent: 4267728 (1981-05-01), Manley et al.
patent: 4363025 (1982-12-01), Jackson

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