Method and apparatus for cancellation of Moire interference in color cathode ray tube displays
US5107188A · kind A · utility
17Cited by
1References
36Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 18, 1991 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Jan 18, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/646
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Visible Moire interference is eliminated by alternately shifting the phase of the horizontal sync signal or video signals such that the phase of each video line, and hence the phase of the resulting Moire interference associated with that video line, is also alternately shifted. The phase of the Moire interferences are shifted such that persistence of vision in the human eye averages oppositely phased phosphor intensity variations occurring on alternating scan lines and/or vertical fields. When viewed by a user of the CRT, optical cancellation of the Moire interference patterns results.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.