- 學位論文
光聚合高分子在OCB Cell上的光電特性研究
Electro-Optical Characteristics of Photopolymer by OCB Cell
摘要
本研究是利用參混光聚合高分子製作成液晶顯示元件，並探討其光電特性。首先探討光學補償彎曲模式（Optically Compensated Bend Mode；簡稱OCB Mode）液晶顯示元件。然後利用聚丙烯酸(PAA)與EOPO之團聚共聚合物，添加雙官能基粉體及液晶E7，製備成液晶溶液再注入液晶盒(OCB cell)裡，放置光罩(Mask)並給予固定外加5V電壓在UV下進行曝光，然後在偏光顯微鏡下外加電壓觀察液晶盒的平面顯示變化現象，發現四號高分子的液晶溶液在3%時，可以明顯觀察未被光罩遮蔽的高分子將會聚合形成高分子格子結構，並造成液晶成高傾角排列，順著光罩形成不連續的結構藉以影響牆周圍的液晶，從光電量測結果顯示，利用此種不連續結構不僅可將內部液晶結構維持在twist的狀態，也成功提升OCB原有的響應速度。因此改善外加電壓下擴散模式轉換到彎曲模式的暖機時間問題。經由響應時間、透光率對電壓曲線的測量，了解光聚合高分子在OCB Cell中的光電特性。
並列摘要
In this study, we utilized mixed photo-polymer to be Liquid Crystal Display(i. e. LCD)elements，and investigated its photoelectric properties . Firstly，we focused to confer Optically Compensated Bend Mode(i. e. OCB mode) LCD elements . Then，we added bi-functional powder and LC E7 in the bulk copolymer of Poly Acrylic Acid (PAA) and EOPO，then poured the LC solution，and exposed it with 5V voltages under ultraviolet (UV) radiation. Finally，we observed the changing phenomena of the planar display of OCB cell with additional external voltage under polarized microscopy . It can be observe obviously the polymer wall in OCB cell when NO.4 LC solution having concentration of 3％ wt . At the same time，the polymer which didn’t sheltered by mask will polymerize，then，lead LC into high inclined angle alignment. And it formed discontinuous structure along mask affected LC which surrounded the wall. The results measured by photoelectric instruments showed the discontinuous structure not only keeps the inner LC structure at twist mode，but also promotes the originated respond-velocity of OCB. As a result to improving the problem of warm-up time from dispersing mode to bending mode under external voltage. At last，we realized the photoelectric display properties of photopolymer in OCB cell via the measure of coincided curve of respond time and transmittancy against voltage 。