Bridgelux Incorporated

Wenhui Zhang

Tao Tong

Xiaolu Chen

Scott H West

Zhengqing Gan

R Scott West

Robert Tudhope

A lamp includes an extended planar light source, and an optical element arranged with the light source, wherein the optical element comprises an outer surface having an indented cusp substantially over the light source. A lamp includes an extended planar light source, and an optical element arranged with the light source, wherein the optical element comprises an outer surface having a portion at a peripheral edge comprising a curvature configured to redirect light emitted from the light source by total internal reflection.

Optics for chip-on-board road and area lighting

Light emitting assemblies comprise a plurality of Light Emitting Diode (LED) dies arranged and attached to common substrate to form an LED array having a desired optimum packing density. The LED dies are wired to one another and are attached to landing pads on the substrate for receiving power from an external electrical source via an interconnect device. The assembly comprises a lens structure, wherein each LED die comprises an optical lens disposed thereover that is configured to promote optimal light transmission. Each optical lens has a diameter that is between about 1.5 to 3 times the size of a respective LED die, and is shaped in the form of a hemisphere. Fillet segments are integral with and interposed between the adjacent optical lenses, and provide sufficient space between adjacent optical lenses so that the diameters of adjacent optical lenses do not intersect with one another.

Methods of making light-emitting assemblies comprising an array of light-emitting diodes having an optimized lens configuration

An LED device with improved angular color performance has a silicone lens shaped as a portion of a sphere. The lens is molded over an array of LED dies disposed on the upper surface of a substrate. Phosphor particles are disbursed throughout the material used to mold the lens. The distance between farthest-apart edges of the LED dies is more than half of the length that the lens extends over the surface of the substrate. The distance from the top of the lens dome to the surface of the substrate is between 57% and 73% of the radius of the sphere. Shaping the lens as the top two thirds of a hemisphere reduces the non-uniformity in the emitted color such that neither of the CIE color coordinates x or y of the color changes more than 0.004 over all emission angles relative to the surface of the substrate.

LED lens design with more uniform color-over-angle emission

A solid-state light-emitting device ('SLD') converting electrical energy to photon energy using a light emitter diode ('LED') and high-temperature multi-layer optics (&#x201c;HMO&#x201d;) is disclosed. The SLD, in one aspect, includes a chip-on-board (&#x201c;COB&#x201d;), a silicone inner layer (&#x201c;SIL&#x201d;), and a Poly methyl methacrylate (&#x201c;PMMA&#x201d;) layer. The COB includes a first surface and a second surface wherein the first surface includes at least one LED. The LED converts electrical energy to optical light and the light subsequently leaves the LED becoming visible light. The SIL includes a first silicone surface and a second silicone surface wherein the second silicone surface is in contact with the first surface of COB and the second silicone surface is in contact with the PMMA layer. The operating temperature of PMMA layer is lower than the operating temperature of SIL.

Method and apparatus for providing high-temperature multi-layer optics

Light-emitting assemblies comprising an array of light-emitting diodes having an optimized lens configuration

An LED device with improved angular color performance has a silicone lens shaped as a portion of a sphere. The lens is molded over an array of LED dies disposed on the upper surface of a substrate. Phosphor particles are disbursed throughout the material used to mold the lens. The distance between farthest apart edges of the LED dies is more than half of the length that the lens extends over the surface of the substrate. The distance from the top of the lens dome to the surface of the substrate is between 57% and 73% of the radius of the sphere. Shaping the lens as the top two thirds of a hemisphere reduces the non-uniformity in the emitted color such that neither of the CIE color coordinates x or y of the color changes more than 0.004 over all emission angles relative to the surface of the substrate.

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Pleasanton, CA, United States of America

Wenhui Zhang