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Light emitting diode package element with internal meniscus for bubble free lens placement

United States Patent

September 28, 2010
View the Complete Patent at the US Patent & Trademark Office
A method for fabricating a light emitting diode (LED) package comprising providing an LED chip and covering at least part of the LED chip with a liquid encapsulant having a radius of curvature. An optical element is provided having a bottom surface with at least a portion having a radius of curvature larger than the liquid encapsulant. The larger radius of curvature portion of the optical element is brought into contact with the liquid encapsulant. The optical element is then moved closer to the LED chip, growing the contact area between said optical element and said liquid encapsulant. The liquid encapsulant is then cured. A light emitting diode comprising a substrate with an LED chip mounted to it. A meniscus ring is on the substrate around the LED chip with the meniscus ring having a meniscus holding feature. An inner encapsulant is provided over the LED chip with the inner encapsulant having a contacting surface on the substrate, with the meniscus holding feature which defines the edge of the contacting surface. An optical element is included having a bottom surface with at least a portion that is concave. The optical element is arranged on the substrate with the concave portion over the LED chip. A contacting encapsulant is included between the inner encapsulant and optical element.
Tarsa; Eric (Goleta, CA), Yuan; Thomas C. (Ventura, CA), Becerra; Maryanne (Santa Barbara, CA), Yadev; Praveen (Goleta, CA)
Cree, Inc. (Goleta, CA)
11/ 496,918
July 31, 2006
This invention was made with Government support under government contact National Energy Technology Laboratory (NETL), Contract No. DE-FC26-05NT42340. The Government has certain rights in this invention