利用親水疏水性質與表面張力之三維結構微透鏡陣列

Abstract

本論文主要介紹利用三維微透鏡陣列取代光學擴散片，進而縮小背光模組尺寸，以及降低能源消耗，使顯示設備能以各多元的方式設計。文中以噴墨、翻模等技術製作微透鏡，此方法利用SU-8光阻與自身維疏水性之特性，並使用噴墨機台製作出凸透鏡，之後再使用蔽蔭遮罩和紫外線�臭氧機進行SU-8基層表面的改質，使之變為親水性，製作出凹透鏡，此方法可於同一平面 (玻璃基板) 上同時製作出凹凸透鏡。製作出此凹凸透鏡後，再利用3D列印技術列印出與模擬相同之模具，並與玻璃基板結合，翻印後可得與模擬相同之為透鏡陣列。 此方法皆提供了簡單、符合成本效益、並利用翻印技術可大量製作之微透鏡製程。

In this thesis we demonstrated a novel design and fabrication processes of convex and concave microlenses on top of light emitting diodes by using hydrophilic confinement effect and a 3D-printer. We used energy conservation and lawnmower algorithm to design a freeform lens and transform the freeform surface into heterogeneous microlenses. The diameters of microlenses on top of a light emitting diode are 500μm and 200μm for concave and convex shapes, respectively. We made heterogeneous microlenses using hydrophilic confinement effect of the SU-8 photoresist by an inkjet printer on a glass substrate. Then we assembled it with a mold made by a 3D-printer to perform replication process. In the replication process, we filled polydimethylsiloxane (PDMS) into the mold to reproduce heterogeneous microlenses. This heterogeneous microlens array can improve the light distribution uniformity of light-emitting diode from 30% to 70%.