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:
Aug. 04, 1987
Filed:
May. 22, 1985
Kazuhiko Nishi, Tokyo, JP;
Takatoshi Ishii, Tokyo, JP;
Ryozo Yamashita, Tokyo, JP;
Shigemitsu Yamaoka, Hamamatsu, JP;
Takatoshi Okumura, Hamamatsu, JP;
Ascii Corporation, Tokyo, JP;
Nippon Gakki Seizo Kabushiki Kaisha, Hamamatsu, JP;
Abstract
A video display controller is provided with a color palette circuit which is capable of converting, at a high conversion rate, color codes read from a VRAM (video RAM) into RGB color data to be supplied to a CRT display unit. The color palette circuit comprises a plurality of color data registers each storing one RGB color data and is supplied with a timing signal synchronized with the display timing of display elements on the CRT display screen. Each color code data including at least two color codes and read from an address of the VRAM is first supplied to a selection circuit which includes at least two decoders. Each decoder decodes the corresponding color codes to generate a selection signal which enables one of the color data registers to output the RGB color data contained therein. Thus, at least two RGB color data are outputted from the color data registers enabled by the outputs of the decoders, and are supplied to an output control circuit which outputs each of these RGB color data in a multiplexing fashion in accordance with the timing signal.