VGA color system for personal computers

Details VGA color system for personal computers VGA color system for personal computers

1992-04-27

1996-11-12

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345150, 395788, G09G 500

Patent

active

055744788

ABSTRACT:
Modifications to a prior art system known as video graphics adapter (VGA) for displaying color images on a monitor attached to a personal computer. The modifications provide the following four enhancements to a standard VGA system: (i) user definable border color; (ii) automatic powering down of the digital analog converter (DAC) component of the VGA RAMDAC and monitor sense comparator for LCD monitors when the RAMDAC is not in use; (iii) stopping of the RAMDAC clock for LCD monitors when the RAMDAC is not in use; and (iv) true color support.

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patent: 4823120 (1989-04-01), Thompson et al.
patent: 5083119 (1992-01-01), Trevett et al.
patent: 5225875 (1993-07-01), Shapiro et al.
patent: 5379049 (1995-01-01), Leach
patent: 5491496 (1996-02-01), Tomiyasu
Macintosh MacPaint, pp. 1-34, 1983.

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