Video display terminal having improved character shifting circuitry
US4342990A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1979 |
| Grant date | Aug 3, 1982 |
| Priority date | — |
| Expiry date | Aug 3, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video display terminal is disclosed for use in displaying images of data characters on a display screen. Multibit coded data words are supplied by a data source, such as a memory, to a character generator circuit which controls the display of data characters on the face of a video display screen. Character codes are used to address a dot pattern memory which stores dot patterns to provide an image of the required data character to be displayed. The dot patterns may be stored on one size matrix in the dot pattern memory, such as in a 9.times.9 cell, and displayed on a larger dot matrix, such as 9.times.16, on the display screen. Subscripts or descending characters may be stored in the dot pattern memory and vertically repositioned when displayed on the screen. Means are also provided for adjusting the vertical positioning of a line of characters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.