利用高分子光聚合作用控制液晶盒預傾角之研究

液晶顯示器主要是利用液晶對光場、電場的異向性，達到控制光顯示強度的目的，然而液晶在液晶層內的排列情況會影響顯示器的光電特性，一般用來配向液晶分子的方式主要是在基板上塗佈垂直或水平polyimide，使液晶分子在基板上形成垂直或水平的配向，然而液晶分子在基板上的預傾角亦會影響光電特性，例如：門檻電壓、轉態時間、響應時間…等等，一般使用塗佈polyimide方式來控制預傾角，是以垂直和水平polyimide的混合液塗佈，使液晶分子在基板表面得到不同的錨定能，藉以達到控制預傾角的目的。本文研究主要是以高分子單體A和高分子單體C混入液晶內，以1wt%的低濃度液晶混合溶液，利用不同的照光時間去累積基板上高分子網的強度，以達到控制預傾角的目的，使用Dimos軟體找出預傾角和照光時間的關係，並模擬相同預傾角下的T-V光電特性，更探討本研究控制預傾角方法在響應時間、殘存離子電荷的影響；另外比較商用高分子UCL002和本研究混合高分子AC控制液晶預傾角的優缺點。

關鍵字

液晶；高分子；預傾角；離子效應

並列摘要

Liquid crystal display (LCD) mainly use the optical and electrical anisotropy of liquid crystal to control the lightness shown on display. However, the deformation in liquid crystal layer can affect the electro-optic characteristics in LCD. In general, the aligned method is coating the polyimide on the substrate to make liquid crystal horizontal or vertical alignment. Nevertheless, the pretilt angle also plays an important role in some electro-optic characteristics, like threshold voltage, transfer-state time, and response time. Using the polyimide, the only way to control the pretilt angle is mixing the vertical and horizontal polyimide to get the different anchoring energy on the substrate in order to align the liquid crystal angularly. In our research, we dope the monomer A and C in liquid crystal with 1wt% concentration, making uses of the variable curing-time to accumulate the strength of polymer network to control the pretilt angles in liquid crystal cell. Besides, we figure out the relation between pretile angle and curing-time and simulate the T-V curve in the same pretilt angle. Furthermore, we discuss in more depth of the effects of polymer in response time and residual ion voltage. In addition, we still compare the advantages and disadvantages between commercial polymer UCL002 and polymer AC.