利用微結構方式改善有機發光元件的光效率及影像品質問題

Abstract

有機發光原件已被認為是新一代的熱門顯示技術之一，而提升有機發光原件的外部量子效率已經廣泛的被研究。在有機發光原件的玻璃機板表面貼附微結構陣列而破壞內部全反射，是一種有效增加外部量子效率的方法。 本篇論文主要是利用光學模擬的方法，模擬不同形狀的微結構陣列貼附於有機發光原件時的光學特性。在本文中主要探討的微結構形狀是金字塔形、截角金字塔形、半球形以及新設計的形狀。藉由系統性地調變這些微結構的參數：底角、排列方式、覆蓋率….等，探討對於總功率增益、強度隨視角的分佈以及影像品質的影響。 在照明應用上，我們著重在有機發光元件貼附微結構之外部出光效率的探討;而當有發光元件應用於顯示器上時，我們除了提升外部量子效率還要兼顧影像的品質，藉由本文的研究，我們將歸納出提升出光效率並減少影像模糊的最佳微結構設計法則。

In this thesis, we set up a simulation model of organic light-emitting devices (OLED) with microstructure attachment. We demonstrated the simulation model and ray tracing analysis with the optical software LightTools TM. In order to improve the out coupling efficiency, we considered the total internal reflection (TIR) between air and substrate interface is a key place to be modified. We apply the micro-pyramid array to organic light-emitting devices (OLED) to reduce the total internal reflection (TIR) between air and substrate interface. Instead of merely concerning the efficiency for lighting purposes, we must take both the light extraction efficiency and image quality into account for display applications. In this simulation, we modulate some parameters such as base width, base angle, fill factor and arrangement of perfect micro-pyramid and truncated micro-pyramid, and try to find out the effects on angular intensity distribution, total power enhancement, and blurred image of the OLED. Finally we bring up several new microstructures and arrangement to control the blur effect and increase light extraction efficiency significantly.