有機發光二極體由於具有輕薄、省電等優勢，近來已成為最熱門的顯示技術，但因其玻璃基板與空氣介面間之全反射現象嚴重，而影響了發光效率，此問題可藉由裝置微透鏡陣列後，改變介面的臨界角而獲得改善。本論文以模擬的方式比較不同形狀之高填充率光學微透鏡陣列，運用於有機發光二極體時，對於發光強度和視角的提升，比較的透鏡形狀包含三角形、四角形、六角形和結合三角形及六角形的新型雙曲率微透鏡，透鏡的參數包含了高度、半徑以及曲率半徑，而曲率半徑會直接影響透鏡的曲面，進而影響透鏡與空氣介面的臨界角，因此特別定義另一參數高徑比(height ratio)作為各形狀透鏡之比較基準，高徑比之定義為透鏡高度與曲率半徑的比值，而高徑比越高透鏡外型就越接近球型。
在光學模擬中比較裝置相同高徑比之各形狀微透鏡後，有機發光二極體的光強增益，結果顯示在高徑比0.13和0.26兩組高徑比較低的數據中，光強增益大小順序為:三角>四角>雙曲率>六角；在0.48的高徑比下之順序為:雙曲率>六角>四角>三角；而在高徑比0.69及0.84兩組高徑比較高的數據中，光強增益大小順序則為:六角>雙曲率>四角>三角，造成以上結果的原因為不同形狀的微透鏡，其臨界角的範圍也不同，若比較透鏡最外圍的最小臨界角，可發現當高徑比由低到高增加時，各形狀透鏡的最小臨界角之變化趨勢與光強增益吻合，呈現反轉的趨勢，顯示形狀會改變透鏡臨界角範圍，進而影響光強增益，此外不同形狀的透鏡在基材面積內的透鏡數的差異，也會使最小臨界角對光強增益的影響放大。
雖然在較高的高徑比中，六角形微透鏡有最佳的光強增益，但欲製作高徑比較高的透鏡，必須縮小透鏡半徑及增加透鏡高度，對於製程條件的要求較嚴苛，製作的難度也較高，而雙曲率微透鏡在目前文獻中常見的高徑比範圍，約0.32~0.56內有佳的光強增益，當高徑比為0.48時，雙曲率微透鏡可提升22%的軸向光強增益，因此雙曲率微透鏡不失為一經濟的解決方案。實驗部分，本研究利用近接曝光法製作雙曲率微透鏡之模仁，並將製作完成後的試片以光學顯微鏡、掃描式電子顯微鏡及三維表面輪廓儀作量測，以確認製作的雙曲率微透鏡模仁之外型。

Organic light emitting diode (OLED) has become the most popular display technology recently due to its lower thickness and less energy consumption. However, the total internal reflection, which happens on the interface between glass substrate and air, decreases the luminance efficiency of OLED. This issue can be solved by applying microlens array to OLED, and thus changing critical angle of interface.
This thesis presents a way to compare the different shapes of high fill factor microlens array for both increasing luminance efficiency and improving viewing angle of OLED by simulation. The lens shapes include triangle, square, hexagon and dual-curvature which is a novel shape composed of triangle and hexagon. In order to compare lens with different shapes fairly, the height ratio of lens are keeping identical. Height ratio is the ratio of lens height and radius curvature of lens contour. The result of simulation differs while height ratio changes. The ranking of lens shapes for increasing luminance of OLED in lower range like 0.13 and 0.27：triangle>square>dual-curvature>hexagon. In middle range like 0.48: dual-curvature> hexagon>square>triangle In higher range like 0.69 and 0.84: hexagon>dual-curvature >square>triangle. For different shapes of lens, the range of critical angle will be different as well. The smallest critical angle of these lens shows similar trend to the result of simulation with increasing height ratio. Since lens shape will change critical angle of interface, so it will also affect the performance of OLED. Besides, the numbers of lens within the area of substrate can cause more performance differences between different shapes of lens.
Although in the higher range of height ratio, hexagonal microlens array increased the most luminance of OLED. It is much harder to fabricate microlens array with high height ratio which usually having smaller diameter and larger lens height. While dual-curvature microlens array increase the most luminance of OLED within the more commonly seen range of 0.32~0.56 in literary. A dual-curvature microlens array with 0.48 of height ratio can boost axial luminance up to 22%. Therefore, dual-curvature microlens array will be an economical solution.
In terms of experiment, this thesis utilizes the method of UV proximity exposure to fabricate dual-curvature microlens array mold insert. Then the completed specimen is examined by using optical microscope, scanning electron microscope and 3D profiler.

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