Optical sheet, manufacturing method thereof, and backlight assembly using the same
US8162512B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2009 |
| Grant date | Apr 24, 2012 |
| Priority date | — |
| Expiry date | Nov 30, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133607
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical sheet receiving an incident light from a light source is provided. The optical sheet includes a body, a plurality of reflective structures, and a plurality of Fresnel lens units. The body includes an incident surface and an emergent surface. The incident surface receives the incident light with an incident angle. The refractive index of the body is ni and i is a positive integer. The reflective structures are placed on the body. There is a spacing W between two neighboring reflective structures. In the direction of the incident light, the thickness of the reflective structure is t. The Fresnel lens units, having a width P, are disposed on the emergent surface. Each Fresnel lens is corresponded to the spacing. When the equation,is satisfied, the incident light passes through the spacing, the incident angle is adjusted by the thickness t and converged by the Fresnel lens units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.