Projection unit for projection type display apparatus
US5570140A · kind A · utility
10Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1994 |
| Grant date | Oct 29, 1996 |
| Priority date | — |
| Expiry date | Jul 7, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/72
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projection type display apparatus incorporating a light receiver or a light transmitter, in which the light signal is received or transmitted through a screen or condensing lens disposed in its vicinity, and hence the luminous flux utility efficiency is high. A projection type display apparatus capable of preventing deterioration of picture quality due to difference in color in the projection units, and the best picture quality is realized even when the projection lenses for different colors are composed of nearly same components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.