Backlighting apparatus and display apparatus using the same
US6095656A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1998 |
| Grant date | Aug 1, 2000 |
| Priority date | — |
| Expiry date | Aug 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133607
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A backlighting apparatus for radiating light on a flat surface to be illuminated comprises a light source having a linear light emitting portion, a light shield section, provided along an outer periphery of the light source on the side of the to-be-illuminated surface, for shielding light traveling directly from the light source toward the to-be-illuminated surface, and a first optical element provided in a longitudinal direction of the light source such that the first optical element faces the light source, the first optical element having a reflection surface for reflecting light emitted from the light source toward the to-be-illuminated surface. A cross-sectional shape of the reflection surface in a direction perpendicular to the longitudinal direction of the light source is determined such that light reflected by the reflection surface of the first optical element has a substantially uniform illuminance distribution on the to-be-illuminated surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.