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:
Jun. 01, 1993
Filed:
Dec. 04, 1991
Applicant:
Inventors:
Larry D Seiler, Boylston, MA (US);
James L Pappas, Leominster, MA (US);
Robert C Rose, Hudson, MA (US);
Assignee:
Digital Equipment Corporation, Hudson, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
340721 ; 395164 ;
Abstract
A method and a device for distinguishing which pixels are to be displayed in a set of overlapping, rectangular windows in video graphics display are provided. Windows are specified as a priority ordered list of rectangles or other shapes, so that each window is computed as being visible at those pixels that are inside its rectangle but outside the rectangles of all higher priority windows. The number of rectangles required is equal to the number of rectangular windows, irrespective of the degree of overlap.