Projection apparatus
US10216073B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2018 |
| Grant date | Feb 26, 2019 |
| Priority date | — |
| Expiry date | Mar 30, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3188
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projection apparatus including an illumination system, a light valve, an optical actuation element and a projection lens is provided. The illumination system provides an illumination beam. An image display surface of the light valve includes a first region and a second region. First pixels of the first region convert the illumination beam into first sub-image beams. Second pixels of the second region convert the illumination beam into second sub-image beams. A transmission path of one of the first sub-image beams in the optical actuation element is a first transmission path. A transmission path of one of the second sub-image beams in the optical actuation element is a second transmission path. A length of the first transmission path is smaller than a length of the second transmission path. In this way, the projection apparatus has good image quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.