Frustration between Ferro- and Antiferro-Electricity and its Application to Liquid Crystal Displays

铁电和反铁电之间的挫败及其在液晶显示器中的应用

• 批准号: 12650010
• 负责人: FUKUDA Atsuo
• 金额: $ 2.11万
• 依托单位: Shinshu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650010/
• 关键词: liquid crystal; antiferroelectricity; ferroelectricity; V-shaped switching; subphase; Sm-C_α; Casimir force; biaxial anchoring; 競合誘電性; ANNNIモデル

The V-shaped switching has attracted attention because of its potential applications to fast-response AM-LCDs. Two companies have developed a group of materials, which are closely related to the prototyped antiferroelectric liquid crystals. This research aims at understanding what are essential to the emergence of the practically usable V-shaped switching. Two essentials are: ( 1 ) the frustration between ferro- and antiferro-electricity, and ( 2 ) the "biaxial anchoring", i.e. a tendency that the more easily polarizable short axis (intuitively, the averaged direction of phenyl ring planes) is liable to become rather perpendicular than parallel to the substrate plates. Since it is parallel to the tilt plane in the V-shaped switching materials, the melatopes may emerge parallel to an electric field even in ferroelectric SmC*, and the biaxial anchoring on polyimide aligning films plays an important role, destabilizing the SS states; the total anchoring becomes almost independent of the a … More zimuthal angle specifying the position on the SmC* tilt cone. The relatively weak anchoring due to rubbing must force to align directors. When the chiral twisting power is large, the distribution around the rubbing direction may become broad. The first essential, i.e. the frustration assures the extreme softness with respect to the tilting direction and hence the hysteresis-free characteristics by easily forming invisible microdomains in the whole switching range. The biaxial anchoring may destroy the antiferroelectric SmC_A* structure. The local director shows a variety of orientational distributions at the tip of the V; neither Langevin-like reotientation nor highly collective azimuthal angle rotation of in-layer directors is essential to the V-shaped switching. Extremely large spontaneous polarization and the resultant polarization charge stiffening of the orientation field is not necessary. Any twisting structure of the smectic layer as well as the director caused by interface effects rather degrades the practical performance of the V-shaped switching. Less

V型开关因材料的potractial AM-LCD而吸引经验极化的短轴（直觉上），平均苯环平面的方向比平行于底板的平行板垂直。铁电smc*，在聚酰亚胺膜上的双轴锚固起着重要的作用，SS状态；对齐languevin inderer driptors的角度旋转对于V形开关是必不可少的。形状开关

项目成果

M.Takeuchi 他5名: "V-shaped switching due to frustoelectricity in antiferroelectric liquid crystals"Ferroelectrics. 246. 1-20 (2000)

M.Takeuchi 等 5 人：“反铁电液晶中截电性引起的 V 形开关”Ferroelectrics 246. 1-20 (2000)。

M.Oshipov 他1名: "Molecular model for the anticlinic smectic-C_A phase"Phys.Rev.E. 62. 3724-3735 (2000)

M.Oshipov 等人：“反斜近晶 C_A 相的分子模型”Phys.Rev.E 62. 3724-3735 (2000)

P.V.Dolganov他2名: "Structural Transitions in Thin Free-Standing Films of an Antiferroelectric Liquid Crystal Exhibiting the SmC_α^* Phase in the Bulk Sample"Phys. Rev. E. (印刷中). (2002)

P.V.Dolganov 等人 2：“在散装样品中表现出 SmC_α^* 相的自立式反铁电薄膜的结构转变”Phys Rev. E.（出版中）。

Fukuda,A., Hakoi,H., Okugawa,T., Ando,T., Matsumoto,T., Suzuki,Y., Johno,M., Hayashi,N., Kato,T., Kawada,S. and Kondoh,S.: "Understanding and Optimization of V-Shaped Switching Due to Frustration between Ferro- and Antiferro-Electricity in Smectic Liquid

福田，A.，箱井，H.，奥川，T.，安藤，T.，松本，T.，铃木，Y.，乔野，M.，林，N.，加藤，T.，川田，S。

Osipov,M.A. and Fukuda,A.: "Molecular Model for the Anticlinic Smectic-C_A Phase"Phys. Rev. E.. 62 [ 3 ]. 3724-3735 (2000)

奥西波夫，文学硕士