異質微透鏡組合在固態照明上的應用

Abstract

在這篇論文中, 我們用了分離變數法去得到正方形目標平面的自由曲面與解微分方程法去得到圓形目標平面的自由曲面, 再藉由我們所創建的自由曲面透鏡將LED的光場強度變得更加均勻. 接下來, 我們會用異質微透鏡組合去近似自由曲面透鏡. 我們藉由模擬的結果去調整曲率半徑與大小. 最後, 藉由優化, 我們可以得到均勻的照度分佈. 而其直下式背光元件厚度為2公釐, 此設計可使均勻度與效率個別達到90%與96%以上. 而其可涵蓋的面積為49平方公分

In this paper, variable separation mapping design method and solving differential equation method were adopted to obtain freeform surface for a square target plane and circular target plane, respectively. Starting from the freeform lens constructed by these methods, we would keep the light field intensity uniform. We then utilized heterogeneous micro lens array (MLA) to approximate the shape of the freeform lens. We adjusted the curvature radius and size by the simulation results. Through optimization process, we could achieve a uniform light intensity of ight emitting diodes using heterogeneous MLA. The thickness of direct-lit backlight unit is 2 mm thick. This design achieved 96% efficiency and 90% uniformity. It covers an area of 49 square centimeters .