Data display apparatus with character refresh buffer and row buffers
US4649379A · kind A · utility
7Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1984 |
| Grant date | Mar 10, 1987 |
| Priority date | — |
| Expiry date | Sep 28, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/343
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data display apparatus employs a raster scan cathode ray tube (1), a character refresh buffer (2) and three character row buffers (5,6,15) to address a character generator (3) in conjunction with a slice counter (4) or offset slice counter (18) under control of an events control module (20). This enables data within a partition on the CRT to be scrolled smoothly (scan-line-by-scan-line) and characters of different height (requiring different numbers of scans) to be displayed on the same row of the CRT.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.