Dependence of pretilt angle on the topography of substrate in liquid crystal alignment brought

Hatoh, Hitoshi; Yamamoto, Takeshi
February 1994
Applied Physics Letters;2/28/1994, Vol. 64 Issue 9, p1103
Academic Journal
Analyzes the dependence of pretilt angle on the topography of substrate in liquid crystal (LC) alignment brought about by rubbing technique. Importance of controlling the pretilt angle of a LC alignment; Effects of spherical projections on LC alignment; Reasons for the increase in the pretilt angle of the polyimide layer.


Related Articles

  • UV modification of surface pretilt of alignment layers for multidomain liquid crystal displays. Lien, A.; John, R.A. // Applied Physics Letters;11/20/1995, Vol. 67 Issue 21, p3108 

    Presents two types of ultraviolet (UV) light induced modification of the surface pretilt of alignment layers. Alteration of the liquid crystal surface pretilt angle of a polyamide film with the UV modification; Presentation of two device structures for fabricating two-domain liquid crystal...

  • Optical switching of nematic liquid crystal by means of photoresponsive polyimides as an... Gi Heon Kim; Enomoto, Shintaro // Applied Physics Letters;11/29/1999, Vol. 75 Issue 22, p3458 

    Studies optical switching of nematic liquid crystal (NLC) by means of photoresponsive polyimides as an alignment layer. Orientation of NLC molecule; Photoirradiation with a dc electric field as bias.

  • History-dependent orientational order of rubbed polyimide for liquid-crystal alignment. Mahajan, Milind P.; Rosenblatt, Charles // Applied Physics Letters;12/6/1999, Vol. 75 Issue 23, p3623 

    Studies history-dependent orientational order of rubbed polyimide for liquid crystal alignment. Creation of microgrooves on the surface; Anisotropic alignment of the polymer molecules.

  • Mechanism of unidirectional liquid-crystal alignment on polyimides with linearly polarized ultraviolet light exposure. Nishikawa, M.; Taheri, B.; West, J. L. // Applied Physics Letters;5/11/1998, Vol. 72 Issue 19 

    Unidirectional liquid-crystal (LC) alignment by a linearly polarized ultraviolet light (UV) exposure was examined using two types of polyimide (PI). PI with a fluorene unit incorporated in a side chain showed LC alignment perpendicular to those of conventional PIs, i.e., perpendicular to the...

  • Generation of nematic liquid crystal alignment with polyimides exposed to linearly polarized... Wang, Yinghan; Xu, Chunying; Kanazawa, Akihiko; Shiono, Takeshi; Ikeda, Tomiki; Matsuki, Yasuo; Takeuchi, Yasumasa // Journal of Applied Physics;7/1/1998, Vol. 84 Issue 1, p181 

    Investigates the alignment behavior of nematic liquid crystal (LC) on the surface of four types of polyimide (PI) films which were exposed to the linearly polarized light of long wavelength (366 nm). Utilization of polarizing microscopy; Information on uniform alignment LC; Achievement of the...

  • Temperature dependence of the polar anchoring strength of weakly rubbed polyimide films for the.... Dai-Shik Seo; Limura, Yasufumi // Applied Physics Letters;7/13/1992, Vol. 61 Issue 2, p234 

    Investigates the temperature dependence of the polar anchoring strength of weakly polyimide films for nematic liquid crystal. Reduction of the polar anchoring energy with temperature rise; Correlation between the polar anchoring energy and the surface order parameter; Comparison of the...

  • Large, continuously controllable nematic pretilt from vertical orientation. Sinha, Ghanshyam P.; Wen, Bing; Rosenblatt, Charles // Applied Physics Letters;10/15/2001, Vol. 79 Issue 16, p2543 

    A polyimide that is designed to produce homeotropic liquid-crystal orientation is baked at high temperature and rubbed with a cotton cloth. It is found that the resulting pretilt angle of the liquid-crystal pentylcyanobiphenyl is continuously controllable from 0° to nearly 40°. © 2001...

  • Homogeneous alignment of nematic liquid crystal induced by polyimide exposed to linearly polarized light. Wang, Yinghan; Kanazawa, Akihiko; Shiono, Takeshi; Ikeda, Tomiki; Matsuki, Yasuo; Takeuchi, Yasumasa // Applied Physics Letters;2/2/1998, Vol. 72 Issue 5 

    Homogeneous alignment of a nematic liquid crystal (LC) was induced by a polyimide (PI) film containing diphenyl ether component exposed to linearly polarized light at 366 nm. Ultraviolet-visible absorption spectra showed that the change in the absorption of the PI was very small after exposure;...

  • A method for liquid crystal alignment using in situ ultraviolet exposure during imidization of polyimide. Kim, Jae-Hoon; Acharya, Bharat R.; Kumar, Satyendra; Ha, Ki Ryong // Applied Physics Letters;12/7/1998, Vol. 73 Issue 23 

    Homogeneous alignment of liquid crystals can be achieved by a technique using polyimide films and in situ exposure to linearly polarized ultraviolet (LPUV) light during imidization. The alignment layers prepared by this method exhibit higher thermal stability while requiring shorter processing...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics