Ramp signal producing method, ramp signal producing apparatus, a

Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix

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

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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.

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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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