Light emitting diode device having a shield and/or filter
US7564070B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 23, 2005 |
| Grant date | Jul 21, 2009 |
| Priority date | — |
| Expiry date | Dec 12, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light emitting diode device capable of shielding or filtering the light in a manner to provide high-gradient edges or regions within the beam pattern. The LED device is also capable of providing selective coloring, thereby cost effectively improving the adaptability and number of applications which can utilize the LED device. The LED device includes an optical layer is positioned in front of a LED chip that includes a material having light transmission properties which change in response to electricity being supplied to the optical layer. The optical layer can thus transmit or absorb light from the LED chip, thus shielding or filtering light from the LED chip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.