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. 25, 2000
Filed:
Apr. 23, 1998
Tetsuro Takizawa, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A graphics display unit is equipped with a frame buffer, an image drawing unit, and a display unit. This frame buffer is arranged by a normal data storage region for directly storing a display content as pixel data, and a compression data storage region for compressing the pixel data as compression data. The display unit is equipped with a flag buffer for storing information indicating as to whether the storage content of said compression data storage region is valid, or invalid, and a compressing unit, and an expanding unit. When the display content is read, while the control unit refers to the flag buffer, if the compression data of the compression region is valid, then the compression data is read from the compression data region and this read compression data is restored as the original data by the expanding unit so as to display the original image. If the compression data is invalid, then the normal data is read from the normal data storage region to be displayed. At the same time, this normal data is compressed by the compressing unit and then the compressed data is stored into the compression data storage region, and a valid flag is set to the flag buffer. The image drawing unit writes the normal data into the normal data storage region to draw the original image. When the normal data is written into the normal data storage region, the image drawing unit clears the flag buffer.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile