Planar light source with through hole and adjusting members
US11536439B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2021 |
| Grant date | Dec 27, 2022 |
| Priority date | — |
| Expiry date | Jan 31, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133616
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A planar light source includes a light guide member having a through hole, a light source, a first light adjusting member, a second light adjusting member, and a light transmissive member. The first light adjusting member having reflectivity and transmissivity with respect to light from the light source is disposed on or above an upper face of the light source in the through hole. The second light adjusting member having reflectivity and transmissivity with respect to the light from the light source is disposed above and apart from the first light adjusting member. The first light transmissive member having a higher transmissivity with respect to the light from the light source than the transmissivities of the first and second light adjusting members is disposed between the first light adjusting member and the second light adjusting member, and between a lateral face of the light source and the light guide member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.