Protection type display device with polarized light reflecting mirror and polarized light source
US5826960A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1997 |
| Grant date | Oct 27, 1998 |
| Priority date | — |
| Expiry date | Jul 10, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3167
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display device includes a reflective type polarizer, a light valve, an analyzer, a mirror, and a polarization rotating film. The polarizer allows a first polarized light to pass therethrough and a second polarized light to be reflected thereby. The second polarized light is then reflected to the polarizer by the mirror, and the vibrating plane of the second polarized light is rotated by the polarization rotating film, so that the second polarized light can pass through the polarizer. The polarizer is inclined to an optical axis of the device. The mirror is arranged near the light source. This principle is also applied to a projection type color display device. In addition, a polarized light source including a lamp, a reflector, a polarizer, a mirror, and a polarization rotating film is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.