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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/47599
標題: | 有機顯示器與有機固態照明之高增光效率微透鏡膜設計 Design of organic light-emitting display and organic solid-state lighting with high-efficiency-enhancement patterned microlens-array film |
作者: | Kuan-Yu Chen 陳冠宇 |
指導教授: | 林晃巖(Hoang Yan Lin) |
關鍵字: | 光學模擬,微透鏡增光膜,增進出光效率,有機發光顯示器,影像品質,有機固態照明,輔助電極, optical simulation,microlens-array films (MAFs),light-extraction efficiency enhancement,organic light-emitting displays,image quality,organic solid-state lighting,and auxiliary electrodes, |
出版年 : | 2010 |
學位: | 博士 |
摘要: | 有機發光顯示器因其廣視角與廣色域的特點,近年成為高階手持行動裝置(PDA手機與數位相機等)的首選;因具大面積軟板卷對卷製程方式與可選擇透明基板的優點,有機發光照明面板也走入商業化;然而平面結構的有機發光元件有著出光效率低下的問題(約20%)。本論文從光學模擬出發,佐以實驗驗證,設計出中空排列微透鏡膜。在有機顯示器上可達高增光效率及維持影像品質;在大面積有機照明面板上配合畫素分區與輔助電極的方式,可達提高出光效率以及改善電流傳導之綜效。
效率提升(藉由貼附高覆蓋率與大高徑比的微透鏡膜)與維持影像品質(小模糊寬度與高影像品質參數)在使用貼附傳統全佈滿微透鏡膜的方法上,向來是兩難問題;但藉由我們獨特的中空排列微透鏡陣列膜有了雙贏的解決方法。 薄膜光學無法計算基板上的微結構,光線追跡法也無法區分有機薄層結構數十奈米的厚度的光學干涉變化;但藉由我們整合電磁薄膜光學與蒙地卡羅光線追跡幾何光學且經實驗驗證過的光學模型,可準確預測基板外加微結構對不同OLED薄層結構之隨視角變化增光比,並可由光學模態能量分析得出不同OLED薄層結構間光萃取效率的絕對值。 輔助電極常用於大面積有機照明面板上以幫助電流於平面上的傳導,但高導電率的輔助電極常有遮光的現象,所以我們提出利用貼附中空排列微透鏡陣列膜的方式,以補償被吸收的光能;舉例來說,在15 × 15 cm2面板上,藉由畫素分區與輔助電極可降低從電極至發光區中心的對角線壓降超過20 V;畫素分區與貼附中空排列微透鏡膜的方式,正向亮度可增加104%,使用高折射率基板更可增加127%,超過本來單一未分區大面積畫素的兩倍。 Organic displays have been recently considered as the first choice of the hand-held devices, e.g., PDA mobile phones and digital cameras, due to the advantages of wide viewing angle and high color gamut. Besides, because of the capabilities of large-area roll-to-roll flexible substrate process and transparent panel, the organic solid-state lighting has been commercialized. However, the planar OLED has the low out-coupling efficiency around 20%. We set up a precise experimentally verified optical model of OLEDs. Then we apply this model to design the center-hollowed MAFs (microlens-array films) to solve the dilemma of efficiency enhancement and image quality. Besides, with the pixel-partition scheme and auxiliary electrodes, the large-area OLEDs have higher angular luminance and better electrical conduction. Traditionally, there has been a dilemma between high efficiency enhancement (by attaching the MAFs of higher fill factor and larger height ratio) and high image quality (low blur-width and high universal image quality index) by the regular of fully-filled MAFs. However, our unique center-hollowed MAF design is a win-win solution to this dilemma. The micro-structured substrate cannot be calculated by the thin-film optics and the optical interference effect by the thickness variation of organic layers also cannot be distinguished by the ray-tracing approach. However, combining the electromagnetic theory and Monte Carlo based geometrical optical ray-tracing approach, we establish the experimentally validated optical model to precisely predict the angular luminance enhancement ratios of various organic layer thickness and parameters of the MAFs. Besides, the absolute value of light-extraction efficiency among various thicknesses of organic layers can also be acquired by the mode analyses. Auxiliary electrodes are often used in the large-area OLED panels for better electrical conduction along the emissive area. However, the auxiliary electrodes often block some portions of light. Thus, we propose the center-hollowed MAFs attachment to recover the optical loss by the absorption of auxiliary electrodes. For example, for a 15 × 15 cm2 organic lighting panel, the pixel-partition scheme assisted with auxiliary electrodes can eliminate the voltage drop from the electrode to the center of the diagonal of the active area by more than 20 V; the pixel-partition scheme assisted with center-hollowed MAFs can lead luminance enhancement at normal direction by 104% and 127% with high-refractive-index substrate which is more than two times that of the reference single un-partitioned large-area pixel. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/47599 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
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