Surface light source device and liquid crystal display device using the same
US5914760A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1997 |
| Grant date | Jun 22, 1999 |
| Priority date | — |
| Expiry date | Jun 18, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0055
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A surface light source device includes a light source, a light guide plate for guiding light from the light source to one surface, and a light-condensing member for outputting exit light from the light guide plate in a predetermined direction. The one surface of the light guide plate is a stepped surface whose thickness decreases step by step at a predetermined pitch from one end, at which the light source is arranged, to the other. The light-condensing member is located to face the light guide plate and includes a plurality of prisms for refracting exit light from the light guide plate toward the direction of a normal to the light guide plate, and a plurality of lenses for condensing and outputting light in a direction within a predetermined range of angles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.