Variable gain screen permitting off-axis viewing with image brightness remaining constant
US4354737A · kind A · utility
7Cited by
6References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1980 |
| Grant date | Oct 19, 1982 |
| Priority date | — |
| Expiry date | Sep 29, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/56
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention is a variable gain non-Lambertian screen surface (12) for employment in a visual display system. The screen surface provides constant image brightness, independent of changes in viewing angle (22). It is therefore suitable for off-axis viewing. The screen gain continuously varies from a magnitude of one to infinity at different portions on the screen surface in such a manner that the equivalent gain preceived by an off-axis viewer (16) corresponds to the viewer perceiving constant image brightness, independent of changes in the viewing angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.