Video display apparatus with vertical scan velocity modulation and video display method thereof
US6912015B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1999 |
| Grant date | Jun 28, 2005 |
| Priority date | — |
| Expiry date | Jun 7, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/32
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A parallel scanning circuit outputs a parallel scanning signal for making forward and backward scanning lines parallel. A vertical correlation detection circuit detects a portion where the change in luminance in the vertical direction exceeds a predetermined value on the basis of a luminance signal, and outputs a movement control signal representing the distance of movement on the screen of the scanning line. A retrace period reversion circuit reverses the lime axis of the movement control signal in a retrace period. A clamping circuit clamps the movement control signal to a predetermined DC voltage at the timing of horizontal synchronizing signal. A synthesizing circuit synthesizes the parallel scanning signal and the movement control signal, and feeds a synthesized signal as a vertical velocity modulation signal to a vertical velocity modulation coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.