Synchronizing circuit for matrix television set
US4393405A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 21, 1981 |
| Grant date | Jul 12, 1983 |
| Priority date | — |
| Expiry date | Aug 21, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A synchronizing circuit especially suitable for a matrix television set using a flat display, such as comprised of liquid crystals, light emitting diodes or electro-luminescent elements in place of a cathode ray tube, is provided. Signals necessary for horizontal and vertical scannings, or the like, are obtained by dividing the signal from an oscillator circuit. The frequency of the oscillator circuit does not equal that of the horizontal scanning signal, that is, in the order of 16 KHz. Phase comparison is performed on a horizontal synchronizing signal and a scanning signal, which is obtained by dividing the signal from the oscillator circuit, to apply negative feedback to the oscillator circuit whereby synchronization is performed. The oscillator is voltage controlled. The circuit is fabricated in a substantially integrated construction using few external parts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.