Apparatus for providing contrast and/or brightness control of a

Details Apparatus for providing contrast and/or brightness control of a Apparatus for providing contrast and/or brightness control of a

1993-06-15

1994-05-31

Groody, James J.

Horology: time measuring systems or devices

Cases

Adaptable

345 94, 345 98, 348687, H04N 557

Patent

active

053174011

ABSTRACT:
The present invention is a video drive apparatus of the two ramp type which includes facility to selectively adjust the brightness and/or the contrast of an image reproduced on a display device. In this apparatus, at least one of the ramp signals is generated digitally by for example a counter. Provision is made to change the counting rate of such counter which effects a change in display contrast. Provision is also made to selectively change the phase of the ramp signal applied to the second stage relative to the start of respective pulses of the PWM signal thereby effecting brightness changes in the reproduced image.

REFERENCES:
patent: 3585517 (1971-06-01), Herbert
patent: 4488150 (1984-12-01), Kanatani
patent: 4888599 (1989-12-01), Harwood et al.
patent: 5072299 (1991-12-01), Park
patent: 5170155 (1992-12-01), Plus et al.

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