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:
Jul. 09, 1985
Filed:
Oct. 19, 1981
Irwin J Robinson, III, Mesa, AZ (US);
Intermark Industries, Inc., Phoenix, AZ (US);
Abstract
A computer is connected to a display device having a display memory system that is updated by the computer. The computer selects a pattern to be displayed and a screen location at which the selected pattern is to be displayed. A display subroutine effects fetching of a byte of pattern data for the selected pattern from a dedicated memory. The fetched pattern data includes pixel codes that indicate whether corresponding pixels of the selected pattern are 'transparent' or darkened. The display subroutine then transmits the pixel codes to the display memory system. The display memory system includes circuitry that detects whether each transmitted pixel code represents a transparent pixel. If it does, the circuitry inhibits writing of that pixel code into a storage portion of the display memory system. The circuitry also enables writing of non-transparent pixel codes into the storage portion of the display memory system.