High efficiency projection displays having thin film polarizing beam-splitters
US5982541A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1998 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Aug 27, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/283
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projection display system includes a thin film polarizing beam splitter/combiner has first and second light transmissive substrates in the form of prisms and a plurality of thin film layers disposed between the prisms. The thin film layers and have predetermined thicknesses and refractive indices which allow unpolarized incident light to be separated into s-polarized and p-polarized light beams. Both frustrated total internal reflection and thin film interference are simultaneously employed to allow s-polarized light to be transmitted and p-polarized light to be reflected over a wide range of wavelengths and angles of incidence. The device further includes two spatial light modulators for encoding an image to be projected. By providing a different signal to each spatial light modulator, a three-dimensional display results.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.