Invention Grant
- Patent Title: LED lens design with more uniform color-over-angle emission
- Patent Title (中): LED透镜设计具有更均匀的角度偏角发射
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Application No.: US14717977Application Date: 2015-05-20
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Publication No.: US09276177B2Publication Date: 2016-03-01
- Inventor: Tao Tong , Wenhui Zhang , R. Scott West
- Applicant: Bridgelux, Inc.
- Applicant Address: US CA Livermore
- Assignee: Bridgelux, Inc.
- Current Assignee: Bridgelux, Inc.
- Current Assignee Address: US CA Livermore
- Agency: Imperium Patent Works
- Agent Darien K. Wallace
- Main IPC: H01L33/50
- IPC: H01L33/50 ; H01L25/075 ; H01L33/54 ; H01L33/60

Abstract:
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.
Public/Granted literature
- US20150255687A1 LED Lens Design with More Uniform Color-Over-Angle Emission Public/Granted day:2015-09-10
Information query
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