Method and means for controlling electron beam in a raster scan monitor
US4370646A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 3, 1980 |
| Grant date | Jan 25, 1983 |
| Priority date | — |
| Expiry date | Nov 3, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G1/162
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a raster scan display in which electron beam energization during raster line scan is controlled by comparing a raster value to stored magnitude digital data as a raster line is scanned, a control signal for energizing the electron beam includes a lower bandwidth video signal whereby energization of the electron beam can be anticipated. A comparator of the raster line value to stored magnitude digital data generates a pulse which is applied to three serially connected latches. Logic circuitry connected to the latches generates pulses which are applied to digital to analog converter circuitry which generates the video control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.