Backlight modules using diffraction optical elements
US7251412B2 · kind B2 · utility
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9Claims
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Key dates
| Filing date | Jun 17, 2005 |
| Grant date | Jul 31, 2007 |
| Priority date | — |
| Expiry date | Jun 17, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S385/901
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Direct backlight modules using diffraction optical elements are provided. A direct backlight module includes a light source and a diffraction optical element, wherein the diffraction optical element is disposed above the light source. By properly arranging the phase function, the diffraction optical element can substantially modulate the wavefront of the light emitted from the light source and control light distribution as well as light direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.