Spiral scan display apparatus with transient suppression means
US3980926A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1974 |
| Grant date | Sep 14, 1976 |
| Priority date | — |
| Expiry date | Jan 30, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G1/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
High speed, spiral scan display apparatus capable of producing distortion free visual presentations from stored video data, and a method for preventing occurrence of visible distortion caused by switching transients in such apparatus. The visual presentations are generated by display writing means which traces a circular path on a display area. The radius of the circular path is periodically incremented to provide for scanning the entire display area. Visible distortion resulting from rapidly changing the path radius is prevented by blanking the display writing means for an interval of time immediately following each radius change. Data storage requirements are minimized by ordering and retrieving video data so that only data sequentially needed during unblanked intervals is supplied to the display writing means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.