Display apparatus and method capable of rotating an image by 180 degrees
US6226016A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1998 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Sep 15, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2200/28
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A central processing unit (310) 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 (420) converts those software addresses to logical addresses representing the locations of those pixels in a 90.degree.-rotated version of the image that the software address signals represent, and the logical addresses are applied to an image-buffer memory (410) to specify the locations in which to store the pixel values. A refresh-address circuit (620) generates the address signals used in fetching from the image-buffer memory (410) the values that are applied to a display device (360) employed to display the image. The refresh-address generator (620) 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-rev…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.