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:
May. 01, 2001
Filed:
Sep. 15, 1998
Seiko Epson Corporation, Tokyo, JP;
Abstract
A central processing unit (,) in a display system carries pixel-value signals and software-address signals representing the locations of the pixels whose values the pixel-value signals represent. An address-translation circuit (,) converts those software addresses to logical addresses representing the locations of those pixels in a 90°-rotated version of the image that the software address signals represent, and the logical addresses are applied to an image-buffer memory (,) to specify the locations in which to store the pixel values. A refresh-address circuit (,) generates the address signals used in fetching from the image-buffer memory (,) the values that are applied to a display device (,) employed to display the image. The refresh-address generator (,) is operable alternatively in row-forward and row-reverse modes and alternatively in column-forward and column-reverse modes. The addresses represent a sequence of columns across rows and rows across an image, and the column addresses increase within a row in the column-forward mode but decrease in the column-reverse mode. The addresses increase between rows in the row-forward mode and decrease in the row-reverse mode. The effect of the different modes is to compensate for reversals such as mirror-image scans and to convert the 90° rotation between clockwise and counterclockwise.