Polarization converter for use in a projector apparatus and projector apparatus comprising the polarization converter
US9213225B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 2012 |
| Grant date | Dec 15, 2015 |
| Priority date | — |
| Expiry date | Jan 26, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N13/337
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A polarization converter for use in a projector apparatus is provided. The polarization converter includes a polarizing beam splitter, a half wavelength retarder and a quarter wavelength retarder. The polarizing beam splitter could split a first light into a first light beam with a first polarized direction and a second light beam with a second polarized direction. The half wavelength retarder is disposed on the side of the polarizing beam splitter and the second light beam is converted into the second light beam with the first polarized direction by the half wavelength retarder. The first and second light beams with the first polarized direction are coupled to form a first polarized light with the first polarized direction. The quarter wavelength retarder is disposed behind the half wavelength retarder so that the first polarized light is converted into a first circularly polarized light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.