Projection type display apparatus and multi-vision projection type display apparatus
US5738426A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1996 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Dec 5, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3194
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projection type display apparatus includes a light source, color separator, half-wave plate, a plurality of light valves, color synthesizer, and projection lens. The light source emits a substantially parallel illumination flux. The color separator separates the light emitted from the light source into light of three colors including red, green, and blue. The light of the respective color passes through the corresponding half-wave plate which is placed in the light path of the light and causes the plane of vibration of the light to rotate through a predetermined angle. Then, the light of each color exiting the half-wave plate passe through the corresponding light valve, being modulated into a color image. The color synthesizer synthesizes the color images into a single full-color image and the projection lens enlarges and projects the single full-color image formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.