大面積量測奈米粒子誘使液晶垂直配向之軟性顯示器

Large-area measurement system for nanoparticles-induced vertical alignment in flexible liquid crystal display

黃柏喻(Po-Yu Huang)

指導教授 ： 施宙聰

國立清華大學/電機資訊學院/光電工程研究所/碩士(2008年)

https://doi.org/10.6843/NTHU.2008.00260

摘要

本論文利用一定比例之奈米粒子POSS與正丁醇的混合物，旋轉塗佈於軟性基板，研究此液晶盒之光電特性，發現奈米粒子POSS可誘使液晶分子垂直配向，並利用表面自由能來佐證之。根據實驗結果、理論推導計算、模擬，我們發現其錨定能約為4.55×10-5 Jm-2，低於傳統之PI垂直配向膜。除此之外，因製程溫度僅約80°C且具有經濟效益，所以適用於軟性顯示器且可克服無法耐高溫製程的問題。
有鑑於軟性顯示器於撓曲時，易造成間隙的不均勻，所以我們架設了可信賴、快速、大面積之一維陣列偵測器的光電特性量測系統，由64個二極體所組成，一次可量得一維陣列的資訊，可有效檢測顯示器之大面積的光電特性，特別適用於軟性顯示器的檢測，我們也與商用機台 (Otsuka5100) 作比較，結果顯示VT-curve與反應時間均吻合,此套系統之時間解析度為1 msec，穩定度為2.7%。

關鍵字

一維陣列偵測器 ； 大面積量測 ； 奈米粒子 ； 垂直配向 ； 軟性顯示器 ； 錨定能

並列摘要

In this thesis, we studied the electro-optical properties of a liquid crystal cell applied nanoparticles as an alignment material. It was decomposed on the substrate by spin coating the mixture, POSS and Butanol. Based on Fowkes’ theory, we indicated that the nanoparticle POSS can induce vertical alignment. According to the experimental results, theoretical prediction, and simulation, we found that the anchoring energy was about 4.55×10-5 Jm-2. It was lower than the traditional PI vertical alignment layer. Meanwhile, the process temperature is about 80°C, which is suitable to fabricate flexible LC displays.
Otherwise, the cell gap of flexible LC display was difficult to maintain under bending condition. So, we developed a reliable and rapid electro-optical measurement system for large area flexible liquid crystal displays. A 64-element photodiode array combined with simple bending mechanism was employed for 1D signal sampling. The system was also compared to another calibrated commercial system (Otuska5100). Both TV-curves and response time almost coincided with each other. The stability of the system was about 2.7 % and the time resolution was 1 msec.

並列關鍵字

photodiode array ； Large-area measurement system ； nanoparticle ； vertical alignment ； flexible LC displays ； anchoring energy

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