高效能導光板之微結構排列設計與分析

The Design and Analysis of a Micro-Structure Array for a High-Efficiency Light-Guide Plate

溫志湧(Chih-Yung Wen) ； 謝祥暉(Hsiang-Hui Hsieh)

《科學與工程技術期刊》 3卷3期 (2007/09) Pp. 67-79

https://doi.org/10.7117/JSET.200709.0067

摘要

LED點亮後將光線從導光板(light guide plate)的入光處射入，光線便以任意的角度及方向在導光板內行進。當導光板表面完全是拋光面時其主要光線只會在導光板內來回行進，直到其能量完全自然衰減為止才會停止行進。但當導光板表面加上一些微結構時，光線就會因微結構而產生漫射或反射，進而破壞光線的全反射使光線產生折射，射出導光板外。然而以目前光電業所製作的導光板主要目的就是讓光源由側邊進入，再利用導光板內的微結構(micro structure)，在不損失光源能量下將光源轉向朝向工作面的方向。 本論文主要探討目前背光模組的導光板微結構排列方式及微結構外型，運用分析的結果進行CAE(computer aided engineering)光學模擬，來比較實際成品的導光板效能表現，並以實驗驗證其正確性。再依模擬分析的資料研發設計出新的微結構排列方式及微結構外型，此新的微結構排列方式及微結構外型在不加上光學膜片時，其輝度可以比現行的微結構排列方式及微結構外型增加10倍以上，其集光效率非常良好。本研究顯示CAE可做為設計高效率導光板的有效工具。

關鍵字

導光板 ； 微結構 ； 背光模組

並列摘要

At any angle, the light rays emitted by an LED travel inside its light-guide plate. If both surfaces of the light guide are optical-grade smooth, most rays will move back and forth until their energy decays. When the surfaces of the light-guide plate are composed of micro structures, the rays are reflected and diffused, thereby destroying the total reflection. The plate can then direct the rays in the desired direction. Currently, the optical industry is prioritizing the design and manufacturing of high-efficiency light-guide plates in back light modules.
In this study the arrangements and geometries of the micro structures of major light-guide plates on the market were analyzed. The commercial CAE (computer aided engineering) software program Speos(superscript ®) was used for numerical simulation. The simulation results were compared with experimental observations. The analyses were used to help design a new micro-structure array. The simulation indicated that the luminance of the proposed design is ten times that of current products. Thus the new design was shown to be very efficient. Moreover, CAE has been demonstrated to be promising for the design of high-efficiency light-guide plates.

並列關鍵字

light guide plate ； micro structure ； back light module