Projection type display apparatus
US6227670A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1999 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Aug 16, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7441
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The projection type display apparatus according to the present invention has a prism for separating incident light into a plurality of light components and combining the plurality of modulated color components. The prism is constituted by a plurality of prism assemblies, each including an optical member made of an optically transparent material having a photoelastic constant whose absolute value is not greater than +1.5.times.10.sup.-8 cm.sup.2 /N with respect to the incident light. More preferably, these plurality of prism assemblies are arranged such that each of a plurality of the separated color components is totally reflected by any of the prism assemblies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.