本研究主要是利用高分子穩定液晶分子排列製作Twist Optically Compensated Bend液晶顯示器。我們利用高分子單體混入液晶中注入cell,在照射UV光使高分子聚合的期間(TUV),以適當的交流電壓(Curing電壓,VUV)施加在液晶盒上,使液晶維持在bend state的排列,在此狀態下做curing的動作,使配向膜表面形成高分子網狀(polymer network)的結構。在無施加電壓下液晶分子能順著高分子網,將液晶的傾角控制在20度到28度之間, 增加splay的自由能,降低twist自由能而使twist→splay的能障變大,將液晶分子會穩定在twist的狀態,不會回去splay的狀態。我們利用均勻配向(Uniform alignment)和部份區域產生高傾角的配向(Pattern alignment)方式來製作cell,將液晶分子維持在twist的排列,以解決OCB暖機時間的問題,並且不影響原本快速響應及廣視角的優點,並以偏光顯微鏡圖及量測穿透率、相位延遲、灰階到灰階的響應時間、視角、光譜圖、CIE色座標之色偏等光電特性,並利用Lcd Master及Dimos模擬軟體驗證。
In this study, polymer stabilized liquid crystal was used to develop a twist optically compensated bend mode LCD. We employed some mixtures of liquid crystal and monomer. In order to produce high pretilt angle, a curing voltage, VUV, was applied on the cell as being irradiated by UV light. The liquid crystal molecules aligned with the polymer nework, so the cell has high pretilt angle by 20 ~ 28. Because of the twist-to-splay energy barrier, the undisturbed cell could stay at twist state. The response time, T-V curve and viewing angle dependence of the sample cell were measured to evaluate the potential in the display application. Simulation on the T-V characteristics of the optically compensated bend mode with different pretilt angles was also shown.