Display device
US4969732A · kind A · utility
38Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1989 |
| Grant date | Nov 13, 1990 |
| Priority date | — |
| Expiry date | Feb 23, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display device includes equipment for projecting light onto a surface. The equipment includes a beam-splitter for effecting partial reflection and partial transmittance of an incident beam. On one side of the beam-splitter are a light source for directing light onto the beam-splitter and a mirror for directing back towards the beam-splitter light reflected therefrom. On the other side of the beam-splitter is a louvre for permitting passage therethrough of light of incident angle relative to a normal to the beam-splitter with in a predetermined restricted range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.