Backlighting module and light guide module both comprising gradient index lens
US9507074B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2015 |
| Grant date | Nov 29, 2016 |
| Priority date | — |
| Expiry date | Jul 16, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0088
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light guide module includes a light guide plate and a gradient index lens. The light guide plate has a light output surface and a light incident surface. The light incident surface is connected to the light output surface. The gradient index lens has a first surface, a second surface and a third surface. The first surface and the second surface are connected to the third surface. The first surface of the gradient index lens is attached to the light output surface. Multiple internal refractive indexes of the gradient index lens are increased gradually from the first surface to the second surface. A minimum refractive index of the multiple internal refractive indexes is less than a refractive index of the light guide plate. The incident light is refracted multiple times within the gradient index lens, and totally reflected back to the light guide plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.