具不同焦距微透鏡陣列之製作及其照明應用

Abstract

微透鏡陣列，顧名思義就是將複數的微小透鏡以陣列方式排列在一起。微透鏡陣列有很多應用，例如：固態的勻光….等。在固態照明應用中，光源往往是一個點光源，且其在不同角度各別發出不同強度的光，在實際應用上，會因為固態照明光源發出來的光不均勻，造成觀看者不舒服的感覺。因此，有許多學者致力研究如何將一固態照明光源，透過光學元件來改變其出光的光場分佈，微透鏡陣列其中一種應用，即是用來均勻LED光源的出光分佈。然而，在前述應用中的微透鏡陣列，大多都是以同一焦距的微小透鏡排列而成的。 在本篇論文中，我們將會提出一種製作具不同焦距之微透鏡陣列的方法。此外，我們試圖將它應用在幫助LED的出光均勻性。製作前，我們先用TracePro來跑模擬，並量測實作出來的結果是否在趨勢上和模擬結果相符合。

Microlens arrays are applied to several areas, such as imaging reconstruction and organic light emitting diode light extraction. Researchers have studied on how to increase the efficiency of luminous current and luminous power of an organic light-emitting device (OLED) [1] by using several spheres with different diameters. In this thesis, a method to fabricate a micro lens array with different diameters is presented. By using negative PR (photoresist) as a boundary confinement, we can make microlens array with different diameters on a single thermal reflowing process. Unlike traditional method, this method does not suffer tight thermal dose control because the PR reflowing can be confined effectively by pre-patterned negative PR boundaries. At last, we will try to make concave microlens array transformed from freeform lens. And compare the illumination map measured from the microlens array transformed from freeform lens with the result of demonstration run by simulation