新型LED封裝結構與技術於光學特性改善之研究

NOVEL LED PACKAGING STRUCTURE & TECHNOLOGY FOR IMPROVEMENT OF OPTICAL PERFORMANCE

張簡千琳(Chang-Chien Chien Lin)

指導教授 ： 葉銘泉 ； 方維倫

國立清華大學/工學院/動力機械工程學系/博士(2013年)

摘要

本文提出新型LED封裝結構體與製程方法用以達成提升發光效率、擴大發光角度、封裝製程中色座標控制等目的。同時以實驗的方式探討影響透鏡形式封裝體的空間顏色均勻性與效率因子。
在翻轉玻璃封裝體設計中，透過Known Good Chromaticity Coordinate的製程流程，建立測試用外部藍光光源與封裝完成品的色座標位置關係，進而達成製程過程中預先檢測色座標分佈的可能性。透明玻璃封裝體的結構設計使封裝體的發光角提升到140°，同時Remote/Conformal Phosphor的架構也得以實現。因選擇玻璃當材料，封裝體的結構表面工藝可用來破壞全反射提升發光效率亦或是利用全反射擴大發光角。此乃新型LED封裝結構設計。
透過基板上的環形微結構設計與材料調變，利用在邊界上的力學平衡達成不用模具即可成型Dome-type 形式的透鏡，用以提升發光效率，透過壓印製程調變透鏡頂端幾何形狀成型Crater-type 的透鏡，用以擴大發光角到175°。減少80%以上的設備投資金額。同時通過業界規範的信賴性實驗驗證。此乃封裝製程技術優化。
延續所提出的透鏡型式LED封裝體製程方法，探討因封裝形式的變異、透鏡形式的變異、不同螢光粉塗佈方式(Conformal coating/Random distribution)與不同螢光粉的位置安排等狀況之下，其效率、發光角度、空間顏色的一致性與空間光譜的分析。

關鍵字

新型LED封裝體 ； 玻璃結構 ； 點膠成型透鏡 ； 色座標監控

並列摘要

The purposes of this study are to enhance the light extraction efficiency of LED package, expand the view angle, in process color bin control and low cost method for lens type LED package.
A novel “Flip Glass Substrate” LED package structure is revealed. The transparent glass is employed as the substrate. This LED package architecture and process has three merits, (1) Large view angle (2) Color bin yield enhancement (like the concept of known-good-die), (3) Surface engineering for selective enhancement in efficiency or view angle.
The structure design and its corresponding process are designed for the manufacture of lens type LED package. The Dome-type or Crater-type silicone lenses are achieved by dispensing and embossing process rather than molding process. This LED package technology herein has three merits: (1) Enhanced the flexibility of lens type LED package designs, (2) Dome-type package design is used to enhance the efficiency, (3) Crater-type package design is used to enhance the view angle.
The characteristics of lens type LED package are studied. The variations in angular CCT and efficiency are experimentally discussed by considering the parameters of package structure、phosphor location and the applying method of phosphor.

並列關鍵字

LED package ； Flip glass substrate ； Dispensing lens ； Color control

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