Graphics display apparatus
US4330834A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1980 |
| Grant date | May 18, 1982 |
| Priority date | — |
| Expiry date | Apr 24, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a cell-organized graphic display apparatus a set of canonical or standard cells is stored in a character generator. A data processor loads character codes into a character buffer and attribute bits into an attribute buffer. Lines to be displayed are computed on a cell-by-cell basis by the processor using pairs of canonical cells and the computed character codes are stored in the character buffer and attribute bits representing displacements of the required canonical cells are loaded into the attribute buffer. During accessing of the character generator, an adder shifts the bit patterns in accordance with the attribute bits. Optionally a second character buffer, a second character generator and a logic mixer are used to allow logical combining of cell images in accordance with attribute bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.