Protection device for the horizontal scanning control of a display screen
US4484112A · kind A · utility
0Cited by
0References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1983 |
| Grant date | Nov 20, 1984 |
| Priority date | — |
| Expiry date | Mar 22, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K4/085
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to a display screen horizontal scanning control protection device. The device comprises a switch making it possible to open or close the supply circuit of the scanning control circuit, said switch being activated with the aid of a signal supplied by an AND gate, whose state is a function of the level of the supply voltage of the central unit, which itself generates the horizontal scanning sync signal activating the scanning control circuit. Application to telematic terminals equipped with a cathode-ray tube screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.