The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 06, 1991
Filed:
Jun. 29, 1988
Applicant:
Inventors:
Larry D Seiler, Boylston, MA (US);
James L Pappas, Leominster, MA (US);
Robert C Rose, Hudson, MA (US);
Assignee:
Digital Equipment Corporation, Maynard, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; G09G / ;
U.S. Cl.
CPC ...
364521 ; 340703 ; 340701 ;
Abstract
A video display system for a computer graphics workstation expands the color look-up table external to the video digital-to-analog (DAC) chip by providing, for each color, a bank of one or more color look-up table extender chips. The extender chips for a given color are connected in series and the banks are connected in parallel between the frame buffer and the video DAC chip. On a pixel-by-pixel basis, and for each color channel, one of the look-up tables afforded by the extender chips or the video DAC chip is accessed using an index from the frame buffer.