Projection television system including a plurality of display elements with corresponding optical axes incident to a screen at different points offset from the screen center
US5337093A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1993 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Jul 29, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/31
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a projection television system having display elements displaying images of respective colors, a screen on which a color image is formed by magnifying and synthesizing the images of the respective colors, projection lenses for magnifying the images on the respective display elements and projecting them onto the screen thereby to form the color image, with the optical axis of the projection lens for a first color being disposed at a right angle to the screen and the optical axes of the projection lenses for second and third colors being disposed at an angle with respect to the optical axis of the projection lens for the first color, color imbalance is reduced. This is achieved by disposing the projection lenses for the second and third colors so that their optical axes are incident on a point different from the point at which the optical axis of the projection lens for the first color is incident. In an alternative arrangement, at least one of the display elements is provided with a filler having a transmittance varied from one position to another.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.