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. 17, 1986
Filed:
Jun. 13, 1983
Applicant:
Inventors:
William O McCallister, Greensboro, NC (US);
Richard M Katz, Greensboro, NC (US);
Assignee:
Vectrix Corporation, Greensboro, NC (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
340703 ; 340798 ; 364521 ;
Abstract
A frame buffer, divided into three bit planes, is addressed by a single grahic display control chip, whose address signal is altered by an adder to address each bit plane at successive, prescribed time intervals during a single display cycle. A data word of N-bits from each of the first two bit planes is read and latched, then loaded simultaneously with a data word of N-bits from the third bit plane into corresponding shift registers. Thus, the number of memory chips in the frame buffer is minimized and three times the normal data output is achieved during each display cycle.