Planar light source device and liquid crystal display device using the same
US6976779B2 · kind B2 · utility
51Cited by
61References
15Claims
0Family size
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Key dates
| Filing date | Jul 24, 2003 |
| Grant date | Dec 20, 2005 |
| Priority date | — |
| Expiry date | Oct 2, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0001
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The liquid crystal display device has red, green, and blue LEDs, each emitting a different color light, as a light source. An acrylic lens is mounted on the emission surface of the LED to change angular distributions of light from the LED. The shape of the acrylic lens varies depending on the color of the LED. The angular distribution of emitting light thereby differs by the color of LED to cancel out wavelength dependency of transmittance at each viewing direction in a liquid crystal panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.