Display system utilizing ambient light and a dedicated light source
US6646636B1 · kind B1 · utility
45Cited by
29References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2000 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Aug 30, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2001/2615
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A display system generally comprising a display device operable to display an image and configured for illumination by ambient light or light emitted by a dedicated light source and a light directing system. The light directing system is operable to direct one of the ambient light and the light emitted by the light source towards the display device. The light directing system comprises at least one holographic optical element which is switchable between an active state wherein light incident on the element is diffracted and a passive state wherein light incident on the element is transmitted without substantial alteration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.