Surface light source and light guide plate having differently configured dots
US6991359B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 2003 |
| Grant date | Jan 31, 2006 |
| Priority date | — |
| Expiry date | Feb 2, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0061
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A surface light source (3, 4, 5) includes a light guide plate (32, 42, 52), which defines an incident surface (321, 421, 521), an emitting surface and a bottom surface (323, 423, 523) opposite to the emitting surface; and a light source (31, 41, 51) adjacent to the incident surface of the light guide plate for radiating light beams into the light guide plate through the incident surface. A multiplicity of generally rectangular dots (328, 428, 528) and generally circular dots (329, 429, 529) is formed on the bottom surface of the light guide plate. The rectangular and circular dots reflect and scatter the light beams in directions toward the emitting surface. The rectangular dots are distributed on the bottom surface corresponding to lower luminance areas of the light guide plate, so that the luminance over the whole emitting surface of the light guide plate is uniform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.