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US 8,803,171 B2Granted
Reduced color over angle variation LEDs
AssigneeKoninklijke Philips N.V.
InventorsSerge J. Bierhuizen, Oleg B. Shchekin
Life of this patent
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Abstract
A light emitting diode (LED) package includes an LED die includes a stack of semiconductor layers including an active region, and a wavelength converting element over the LED die. The wavelength converting element includes two or more non-flat surfaces that produce a desired angular color distribution pattern.
Claims13
A light-emitting diode (LED) package, comprising:
- a lens, the bottom of the lens defining a plurality of concave surfaces;
- a wavelength converting material disposed over the concave surfaces to form a wavelength converting element with a plurality of convex emitting surfaces arranged to produce a desired predetermined angular color distribution pattern;
- and
- an LED die under the wavelength converting element, the LED die comprising a stack of semiconductor layers including an active region.
1 more element
A light-emitting diode (LED) package, comprising:
- an LED die comprising a stack of semiconductor layers including an active region;
- and
- a wavelength converting element over the LED die, the wavelength converting element comprising one or more ceramic phosphor plates that form a plurality of stepped emitting surfaces emulating a plurality of curved emitting surfaces arranged to produce a predetermined angular color distribution pattern.
A light-emitting diode (LED) package, comprising:
- a dome shaped lens comprising a transparent material filled with phosphor, the bottom of the lens defining a plurality of concave surfaces;
- and
- an LED die under the lens, the LED die comprising a stack of semiconductor layers including an active region.
Dependencies are inferred from the claim text.