VGA controller for displaying images having selective components from multiple image planes
US5254984A · kind A · utility
42Cited by
12References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 3, 1992 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Jan 3, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/9208
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A VGA controller having an overlay mode for displaying images formed from selective components of multiple image planes. A first image and a second image overlaying the first image are interleaved into three of four bit planes of a dynamic random access memory. When displaying the image, the controller will simultaneously read from the first and second images. If the value of the second image is non-zero, then the second image is displayed. Otherwise, the first image is displayed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.