Surface light source device of side light type, liquid crystal display and guide plate
US7626655B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 11, 1999 |
| Grant date | Dec 1, 2009 |
| Priority date | — |
| Expiry date | Jun 11, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0053
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A surface light source device of side light type illuminating an LCD panel and comprising a guide plate, a primary light source, a reflection sheet, and a prism sheet for light control. A plurality of fine light scattering elements and rough area M are formed on an emission face of the guide plate. The rough area M is formed among the light scattering elements and has scattering power weaker than that of the light scattering elements. The dot-like light scattering elements are distributed according to a certain pattern that is designed to promote emission. Emission is promoted where the light scattering elements are formed and also in the area M. Accordingly, fine periodic bright-dark unevenness and glaring are reduced and the prism sheet, disposed on the emission face, is prevented from sticking to the emission face.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.