Illuminating device and display unit
US8246188B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2009 |
| Grant date | Aug 21, 2012 |
| Priority date | — |
| Expiry date | Jul 1, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133607
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An illuminating device capable of decreasing not only in-plane luminance unevenness in the front face direction but also in-plane luminance unevenness when viewed from a diagonal direction is provided. Where an occupancy ratio of a return light generation section in which light from respective linear light sources vertically entering a light incident surface of an optical sheet is entirely reflected by a surface of a convex section and return light oriented toward a reflecting plate is generated out of a first region R1 when the optical sheet is viewed from the normal line direction of a face is K1; and where an occupancy ratio of a return light generation section in which light from the respective linear light sources vertically entering the light incident surface of the optical sheet is entirely reflected by a surface of convex sections and return light oriented toward the reflecting plate is generated out of a second region when the optical sheet is viewed from the normal line direction of the face is K2, and K1 is larger than K2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.