Anti-glare filter with improved viewing area
US4995701A · kind A · utility
7Cited by
4References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 6, 1989 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Mar 6, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133504
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A filter for reducing the glare of a viewing screen caused by ambient light and increasing the viewing area constructed of a substantially transparent sheet of material having first and second faces. The first face is substantially planar while the second face has a plurality of V-shaped grooves, each groove being formed by two walls. The geometry of the V-shaped grooves is such that ambient light enters the filter and becomes trapped therein due to internal reflection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.