本論文中我們提出了在摻雜偶氮染料之高分子球型液晶聚合物混合薄膜中之光引致偶氮染料分子垂直吸附的機制。實驗結果證明若在照光激發偶氮染料期間外加適當強度之交流電壓及照光時間，則染料分子將會垂直吸附於聚合物層中，而當電壓取消後，吸附之染料分子會配向樣品中的液晶，最後形成垂直排列。此外，可利用熱擾動使吸附在聚合物層之染料分子脫附，再照光使脫附的染料分子重新吸附在聚合物層中。我們將此一機制應用於雷射引致強度光柵與液晶顯示器中，並分析該元件之各種光電現象及其成因，由實驗得知，所得之光柵為一振幅光柵；而利用垂直吸附所得之液晶顯示器為一個無需偏振片的液晶顯示器，除此之外，該顯示器可利用電壓控制其開與關、可利用熱擾動將所顯示的圖像抹除、再利用光重新寫入圖像等特性，其總反應時間約為60 ms，且對比度可達到30。

This thesis investigates the mechanism of light-induced azo dye adsorption in dye-doped polymer-ball-type polymer-dispersed liquid crystal (PBT-PDLC) films. The experimental results show that the dyes are adsorbed onto the UV cured polymer film with their long axes being perpendicular to the substrate surface if an optimized AC voltage is applied during optical-patterning. After the applied voltage is switched off, the adsorbed dyes remain the same alignment, and align the liquid crystals homeotropically in the PBT-PDLC sample. In addition, the dyes adsorbed onto the polymer layer can be desorbed by thermal disturbance, and then be re-adsorbed onto the layer following the optical recording mentioned above. The mechanism is applied to fabricate laser-induced intensity gratings and polarizer-free liquid crystal displays. The electro-optical phenomena and the fabrication processes are analyzed. The results show that the laser-induced grating is an amplitude grating. Besides, the liquid crystal display can be switched by applying a voltage, then erased by a thermal disturbance and rewritten optically. The measured switching time is in the order of milliseconds (~ 60 ms), and the contrast ratio is measured to be about 30.

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