Planar light source unit and display device
US6991358B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 28, 2003 |
| Grant date | Jan 31, 2006 |
| Priority date | — |
| Expiry date | Feb 19, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0036
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light guide plate has a hologram pattern on a light exit surface. The hologram pattern anisotropically diffuses light in the direction parallel with a light incident surface of the light guide plate. On a back surface of the light guide plate are formed mirror-polished prism structures extending parallel with the light incident surface. A downward-pointing prism sheet with a given prism apex angle is placed on the light exit surface of the light guide plate. The use of the downward-pointing prism sheet together with the light guide plate having the anisotropic diffusion hologram pattern integrally formed thereon produces a liquid crystal display device with enhanced luminance properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.