Raster CRT having balanced pel distribution for flicker reduction
US4521774A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1981 |
| Grant date | Jun 4, 1985 |
| Priority date | — |
| Expiry date | Nov 19, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G1/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A raster-scanned CRT device includes auxiliary vertical deflection means operable during each scan line of the raster to deflect the electron beam selectively between adjacent pairs of uniformly spaced image lines on the screen. Control logic operates in response to video information representing an image to be displayed to write image pels on the screen during two successive field scans of the raster. The auxilliary deflection means is controlled so that the entire image is formed on the image lines, and the field scan in which the pels are allocated for display is selected on-the-fly for successive portions of the input video in such a way that pel imbalance between the two fields constituting the final image is minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.