In this study, we have investigated the generation of pretilt angle in nematic liquid crystal (NLC) in the cell with oblique non-polarized ultraviolet (UV) light irradiation on two kinds of the polyimide (PI) surfaces. It was found that the monodomain alignment in NLC is obtained having a PI surface without side chain. We successfully observed that the generated pretilt angle of the NLC is about 3° with an angle of incidence of 70° on the PI surface without side chain. It is considered that the pretilt angle generation in NLC is attributed to the interaction between the LC molecules and the polymer surfaces due to photo-depolymerization reaction. Also, the uniform alignment of NLC is attributed to anisotropic dispersion force due to photo-depolymerization of polymer on PI surfaces.
|Number of pages||12|
|Journal||Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals|
|Publication status||Published - 1999|
|Event||Proceedings of the 1998 17th International Liquid Crystal Conference - Strasbourg, France|
Duration: 1998 Jul 19 → 1998 Jul 24
Bibliographical noteFunding Information:
The authors wish to acknowledge H.Fukuro of Nissan Chemical Industries Co., Ltd. for providing PI materials. This research was supported in part by Grant of Development of Advanced Technologies for Flat Panel Displays of the Ministry of Science and Technology and Ministry of Trade, Industry and Energy of Korea.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics