Novel alignment method for control of high pretilt angle by using a solvent dipping effect on polymer surfaces |
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| Authors: | Jeong-Ho Lee Dae-Shik Seo |
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| Affiliation: | 1. Institute of Organic Chemistry, Technische Universit?t Berlin , D-1000, Berlin, 12, Germany;2. Institute of Organic Chemistry, Technische Universit?t Berlin , D-1000, Berlin, 12, Germany;3. The Weizmann Institute of Science , Rehovot, 76100, Israel;4. The Weizmann Institute of Science , Rehovot, 76100, Israel |
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| Abstract: | A novel alignment method for control of high pretilt angle in nematic liquid crystals (NLC), using a solvent dipping effect on various alignment layers, was successfully investigated. The pretilt angle of a NLC is increased by dipping before rubbing treatment on three kinds of rubbed polyimide (PI) surfaces. The pretilt generated by the dipping after rubbing a PI surface with a short side chain is high compared with a PI surface with a long side chain. The pretilt generated by dipping before rubbing homeotropic layer of a positive type NLC (δε > 0) is lower than that of the negative type NLC (δε < 0). The generated NLC pretilt angle is attributed to the perpendicular component of the permittivity epsilon of the NLC. |
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