Raster scan display apparatus for dynamically viewing image elements stored in a random access memory array
USRE31200E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1979 |
| Grant date | Apr 5, 1983 |
| Priority date | — |
| Expiry date | Oct 9, 1999 |
Classification
- Technology area (CPC —)General
Abstract
A computer graphics display system including random access raster memory for storing data to be displayed, a raster memory control unit for writing data into the raster memory, a video control unit for causing such information to be displayed on a CRT display screen, a micro control unit for controlling the function and timing of the raster memory control unit and the video control unit, and a computer adapter for facilitating data exchange between the micro control unit and a host computer. The displayed image can have extremely high complexity with essentially no problem of display flicker. Zoom and pan features allow the use of a very complex stored image in a flexible manner, and a split-screen technique enables an operator to work on a very complex picture at a detail level while still having an overview of the total picture, or any portion thereof, simultaneously presented before him. The split-screen feature also allows the simultaneous display of alphanumeric messages such as prompts, menus, or X-Y readouts added to the graphics display and a small area of the raster memory is usually reserved for this purpose. An XOR feature allows a selective erase that restores lines cro…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.