Image display device and Fresnel lens sheet used therefor
US7675679B2 · kind B2 · utility
0Cited by
3References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2006 |
| Grant date | Mar 9, 2010 |
| Priority date | — |
| Expiry date | Jan 24, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133526
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A Fresnel lens sheet used for an image display device is disclosed. The Fresnel lens sheet is provided with a first prism group in an area of a light entrance plane of the Fresnel lens sheet where the incident angle of light is equal to or more than a predetermined incident angle and a second prism group in an area of a light entrance plane of the Fresnel lens sheet where the incident angle of light is less than the predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.