Color graphics processor
US6046751A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1998 |
| Grant date | Apr 4, 2000 |
| Priority date | — |
| Expiry date | Feb 5, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/222
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color graphic processor generating a picture screen formed by a two-dimensional pixel array for a raster-scan display. The color graphic processor comprises a scan image generator and a color video encoder. A circular pixel buffer having a plurality of pixel buffer units is used to buffer pixel data for drawing and displaying. The pixel buffer unit storing the pixel information of a current scanning position is circularly reused after the scanning position moves to the next one. The number of pixel buffer unit is flexible and does not have to be the same as the number of pixels in a horizontal scan line. A transparent information storage means and a transparent controller are included to reduce the size of the pixel buffer and control transparent pixels. The color video encoder processes digital luminosity, saturation and hue signals according to a video sync signal and a color burst flag signal to generate a digital luminosity signal and a digital chromaticity signal. The two video signals are combined to form a composite video signal. Digital-to-analog converter converts the digital video signals to analog video signals. The color video encoder supports both NTSC and standard.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.