Self-Restoration by Smectic Layer Structures of Monostable Ferroelectric Liquid Crystal in Flexible Devices
Self-Restoration by Smectic Layer Structures of Monostable Ferroelectric Liquid Crystal in Flexible Devices
复制标题
柔性器件中单稳态铁电液晶近晶层结构的自恢复
DOI：
10.1143/jjap.43.8161
复制
发表时间：
2004
影响因子：
1.5
通讯作者：
F. Sato
中科院分区：
文献类型：
--
作者：
H. Fujikake;Hiroto Sato;F. Isaka;T. Murashige;H. Kikuchi;T. Kurita;F. Sato
本文讨论了用于柔性显示器的单稳态铁电液晶中影响近晶层形变和分子取向的自恢复现象。首先，通过精确剪切两个衬底，考察了使用取向层锚定在衬底上的近晶层的倾斜“书架”结构的机械稳定性。单稳态铁电液晶的微观织构表现出对剪切的容忍性，自恢复被认为是由于近晶层重联现象，而传统的双稳态铁电液晶薄膜由于稳定分子方向的倾斜而产生取向缺陷。然后，我们制作了一种包含精细聚合物光纤网络的柔性单稳态器件，其中分子取向的聚合物光纤的锚定导致了单稳态液晶开关的观察。由于近晶层结构的剪切容限提高，在10000 mm×100 mm的器件中，即使在最小曲率半径为20 mm的情况下弯曲超过10000次，也保持了均匀的液晶排列。
In this paper, we discuss a self-restoration phenomenon affecting smectic layer deformation and molecular alignment in monostable ferroelectric liquid crystals used for flexible displays. First, the mechanical stability of tilted `bookshelf' structures of smectic layers anchored on substrates using alignment layers was examined by precisely shearing two substrates. The microscopic texture of a monostable ferroelectric liquid crystal showed tolerance to shearing and the self-restoration was thought to be due to a smectic layer reconnection phenomenon, whereas a conventional bistable ferroelectric liquid crystal film generated alignment defects due to the tilting of the stable molecular direction. We then fabricated a flexible monostable device containing fine polymer fiber networks, where anchoring of molecularly aligned polymer fibers led to the observation of monostable liquid crystal switching. A uniform liquid crystal alignment was maintained in a 100 mm×100 mm device even after bending more than 10000 times at a minimum radius of curvature of 20 mm, due to the enhanced shearing tolerance of the smectic layer structure.