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:
Sep. 26, 1989
Filed:
May. 02, 1988
Robert J Dubner, Westwood, NJ (US);
Dubner Computer Systems, Inc., Paramus, NJ (US);
Abstract
A video graphics memory storage reduction technique combines a frame buffer memory system with a run length encoded memory system by providing a luminance/chrominance decoder/multiplexer to convert output digital data segments from a memory into color components in lieu of using a color look up table. The digital data segments also are input to a detector and a switch, with the luminance portion being compared with a predetermined fixed value outside the valid luminance value range and the chrominance portion being passed through the switch in lieu of a constant when the luminance matches the detector value. A run length encoder logic circuit uses the output of the switch to generate access commands for the memory, and the detector causes the luminance/chrominance decoder to hold the last color until the next digital data segment is accessed by the logic circuit.