OCB同時擁有快速響應與廣視角特性,而愈來愈受到重視,但OCB由Splay state轉態到Bend state需要一段很長的Warm-up time,且Bend state在低電壓不穩定造成穿透率不足…等問題,使得OCB一直無法實用。 為了解決OCB這些問題,我們提出一種新的裝置名為iOCB,iOCB它是在OCB中摻雜旋光性物質(Chiral),使其初始狀態維持在Twist state,利用Twist和Bend之間是連續轉換的特性,解決OCB轉態的問題。接著再利用插黑技術,讓液晶分子在一個掃描時間內,即使操作電壓在0V,液晶分子也能動態穩定在Bend state,因而可提高穿透率。所以我們提出的iOCB除了擁有OCB原本快速響應及廣視角…特性,還解決了OCB轉態和穿透率不足的問題。 我們也進一步研究iOCB的動態響應機制,我們發現Twist OCB在插黑驅動下,因為流動效應(Flow effect)的關係,會使靠近基板的液晶分子有反向扭轉(Reverse twist)現象,而中間層液晶分子有過象限(Tip-over)現象發生。最後我們藉此流動機制與雙頻液晶的特性,發明並做出一種新的雙穩態液晶顯示模態的液晶盒(Bistable Twist OCB)。此模態在製程上跟原本的OCB一樣,只需改變液晶和驅動波形,就可以讓Twist OCB除了原有的優點,還增加了雙穩態的特性。
Recently, the OCB-cell have received considerable attention ,because the fast response time and wide viewing angle properties. However, the bend state of OCB cell is not stable at low voltage and it has low transmittance problem. Therefore, the OCB mode is not be mass produced. To solve the issues, we proposed the iOCB device that cmobined Twist OCB and black insertion technology. The Twist OCB sloved the warm-up time issue by using continuous deformation of Twist state to Bend state. The black insertion technology sloved the low transmittance issue by using dynamic bend. Therefore, the iOCB have fast response and wide view angle properties, moreover the iOCB can solved the issues of OCB. Further, we study the dynamics of the iOCB device. We find the reverse twist and tip over phenomenon of the LC direction in the iOCB. Final we invented a bistable device by using the flow effect of iOCB and the property of dual frequency liquid crystal. The novle bistable device called Bistable Twist OCB.