液晶顯示技術之一－－扭轉向列場效應技術

李逸士

《化學》 47卷3期 (1989/09) Pp. 234-240

https://doi.org/10.6623/chem.1989033

摘要

液態晶體除了同時具有液體物質的流動性和結晶體的光性外，也很容易受外加電場所極化。向列液晶(nematic liquid crystal)分子扭轉排列，有旋轉偏光面的能力；外加電場更可改變向列液晶分子的扭轉排列而使其失去旋光的作用。因此，將扭轉排列的向列液晶安置在偏光方向互相垂直的兩偏光片之間，用積體電路的訊號來控制液晶分子的旋光能力，使其產生可視的光學對比，這就是扭轉向列液晶顯示的基礎原理。

並列摘要

Liquid crystal materials can flow like a fluid and simultaneously possess the optical properties of a crystal. They can also be easily polarized by an external electric field to exhibit an induced dipole moment. Generally, nematic liquid crystal molecules in chiral arrangement can rotate the plane of polarized light. This optical rotating ability disappears when an electric field is applied to remove the chirality of the molecular arrangement. Therefore, by controlling the orientation of liquid crystal molecules between crossed polarizers with an externally applied electric field, e.g. signals from an .IC, will result in some visible optical changes. This field control of the optical properties of liquid crystals is the basic principle of Twisted Nematic Field Effect Liquid Crystal Display (TNFE LCD).