Color television window expansion and overscan correction for high-resolution raster graphics displays
US5119082A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1989 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Sep 29, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/2628
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video pixel presentation rate expansion circuit is provided for use with a high-resolution display system. The overall display system includes a high-resolution monitor, a computer for providing control signals, including a high-resolution frame buffer for storing computer graphics and TV video images and reading out said video data at a rate controlled by said control signals and providing said data with a high-resolution monitor for display. The expansion circuit of the present invention comprises means responsive to an expansion pattern generated by the computer for changing the time base of the video pixel data read out of said frame buffer. Circuit includes means responsive to said expansion pattern for selectively repeating predetermined scan lines of said video display and for selectively repeating certain pixel along a given scan line to match the time base of the video data read out of said frame buffer to the time base of said high-resolution monitor. According to a preferred embodiment of the invention the expansion circuit functions to modify the control signals which controls the read-out of the frame buffer in a predetermined fashion without any additional video buf…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.