- 學位論文
軟性顯示器之光電特性量測
Optoelectronic characterization of flexible display
摘要
雙穩態反射式膽固醇液晶顯示器(bistable reflective cholesteric liquid crystal display)具有記憶效應，當不施加電場驅動時，其顯示畫面依舊能保持一段長時間，因此具有省電的效果。此外，此型顯示器不需要使用偏光板即可顯示，可達到減少面板的製作成本與降低面板厚度的效果。對於不需經常更新畫面的顯示而言，如：電子書、電子廣告看板、標籤等此類的顯示器具有可重複使用、降低生產成本與達到環保的優點，將來更可朝向可撓曲、攜帶方便的目標邁進。 本論文研究包括兩個部份：一. 量測傳統玻璃基板雙穩態膽固醇液晶顯示器和軟式雙穩態膽固醇液晶顯示器相關光電特性。二. 我們利用去年所設計的彎曲機台，繼續進行不同導電膜寬度(50 μm∼1000 μm)PC/ITO基板與PC/IZO基板的電阻值研究，並再一次探討PC/ITO基板與PC/IZO基板兩者間的差異。 結果顯示雙穩態膽固醇液晶Homeotropic texture到Planar texture的反應時間與液晶層的螺距(pitch)大小成反比，軟性雙穩態膽固醇液晶顯示器各texture轉換的反應時間與彎曲半徑並無明顯的關係。此外，PC/ITO基板一開始受到形變影響所以電阻增加幅度較大，不同導電膜寬度的PC/ITO、PC/IZO基板與電阻值增加關係圖形，由於樣品數據尚不足，還無法做確切的討論。
關鍵字
軟性顯示器並列摘要
The bistable reflective cholesteric liquid crystal display (ChLCD) have memory effects, they can remain the picture for a long time without applying electric field. And because of their unique optical properties, they do not need polarization sheet. So they can lower the manufacturing cost and the thickness of the panel. ChLCD is suitable for applications like e-book, electronic advertising signboard, bill board and label, etc, the light weight and flexible ChLCD is the future goal. This thesis includes: 1. We measure the electro-optical characteristics of under cyclic bending the traditional glass substrate ChLCD and flexible ChLCD. 2. We use the bending machine designed last year, to study on different PC/ITO substrate and PC/IZO substrate, with different width (50 μm∼1000 μm) of conducting film. The result shows that the response time( cholesterol liquid crystal Homeotropic texture to Planar texture) is inverse proportional to size of pitch of layer of liquid crystal. Flexible cholesterol liquid crystal display response time is not effected under bending condition. And, the resistance of PC/ITO substrate influenced by deformation at the beginning, so it causes the increase of resistance. We cannot obtain a better experiment result, due to the lack data of PC/ITO and PC/IZO with various sizes in width.