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:
Jan. 21, 1992
Filed:
Oct. 03, 1989
Akihiro Nomura, Nara, JP;
Toshimi Kiyohara, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A system for maximized utilization of a display memory of a type including 2.sup.n memory elements of equal storage capacity arranged in a block fashion in corespondence with a display screen, each memory element being capable of storing, in a two-dimensional address, the pixel data which includes a predetermined number of bits. The system includes 2.sup.n-m memory groups, each includes 2.sup.m memory elements neighboring with each other on the display screen, an RAS switch connected between an RAS signal line and an RAS terminal of each of the memory elements forming each memory group, and a CAS switch connected between a CAS signal line and a CAS terminal of each of the memory elements forming each memory group. Thus, they can be switched over on a hardware basis to allow the reading of the pixel data from the display memory to be compatible with either one of a monochromatic and color display device, or one of a vertically and horizontally longer display device.