Drive method for synchronizing scanning and modulation of flat-configuration color CRT
US4920410A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1988 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Apr 25, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A drive method for a color CRT in which a point-sequential color video signal is produced to drive a modulation electrode of the CRT, in which an index signal is generated consisting of pulses at a frequency identical to a frequency of scanning successive screen phosphor color trios of the CRT, multi-phase index signals are derived from that index signal, and respective time differences between scanning timings of each color trio in each scan line and a specific index signal phase are successively measured, stored in memory, and subsequently read out to produce timing control signals for gating the color components of the point-sequential video signal. Requirements for timing accuracy and assembly precision of the CRT can thereby be substantially relaxed by comparison with a prior art single-phase index signal method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.