Reflection-type projection screen
US8014066B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2009 |
| Grant date | Sep 6, 2011 |
| Priority date | — |
| Expiry date | Mar 4, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/60
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A reflection-type projection screen is provided having uniformly high gain over a wide range of viewing angles. The projection screen includes a dual-purpose light reflective, supportive substrate including at least one unpigmented flash-spun plexifilamentary film-fibril sheet having a light reflectance of greater than about 85% and a gloss of less than about 10% when measured at a 60° incident angle, and an optical diffusion layer of a light transmissive melt-processible polymer containing diffusion-enhancing particles covering at least one surface of the substrate. The projection screen has an optical gain of between about 0.90 and about 2.0 and the optical gain deviates by no more than about 8% over viewing angles between −60° and +60°. The projection screen has good drapeability, rollability the ability to lay and hang flat. The projection screen can also be recycled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.