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Journal of Applied Physics / Browse Journal / Volume 74 / Issue 3

J. Appl. Phys. 74, 2071 (1993); doi:10.1063/1.354772 (5 pages)

Amorphous twisted nematic–liquid‐crystal displays fabricated by nonrubbing showing wide and uniform viewing‐angle characteristics accompanying excellent voltage holding ratios

Yasuo Toko1, Takashi Sugiyama1, Kazuhisa Katoh1, Yasufumi Iimura2, and Shunsuke Kobayashi2

1Stanley Electric Co., Ltd., Yokohama, Kanagawa 225, Japan Map This map
2Faculty of Technology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184, Japan Map This map

(Received 16 February 1993; accepted 20 April 1993)

A new twisted‐nematic (TN)–liquid‐crystal display (LCD) device has been prepared without rubbing, which is called the no‐rubbing (NR) technique. The device is shown to exhibit wide and uniform viewing‐angle characteristics without showing a contrast inversion in the vertical direction of the cell. This characteristic is achieved in particular by filling chiral‐molecular‐doped nematic LCs (NLCs) in the isotropic phase into a cell. The substrate surfaces of the cells are either bare indium‐tin‐oxide films or those coated with polymer materials such as polyimide. These films are optically and structurally isotropic in a quasi‐macroscopic scale (say, 100×100 μm2). In particular, the polymer films are capable of stabilizing and homogenizing the distribution of the NLC directors at the surfaces. The TN‐LCDs fabricated by the NR technique, called amorphous TN‐LCDs, are also featured by the excellent voltage holding ratio which is necessary to achieve good active matrix driving, and, furthermore, the device exhibits a very small viewing angular dependence in the electro‐optic (EO) characteristics, which provides a significant benefit for achieving a good gray‐scale operation. This rubbing‐free technology may contribute not only to the significant improvement of the EO performance of TN‐LCDs but also to the simplification of the production process and in turn to the reduction of the production cost.

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KEYWORDS and PACS

Keywords

NEMATIC CRYSTALS, DISPLAY DEVICES, AMORPHOUS STATE, FABRICATION, ITO LAYERS, OPTICAL PROPERTIES, FILMS, VOLTAGE DEPENDENCE, ORIENTATION

PACS

  • 85.60.Pg

    Display systems

  • 61.30.Gd

    Orientational order of liquid crystals; electric and magnetic field effects on order

  • 42.70.Df

    Liquid crystals

ARTICLE DATA

Permalink
http://link.aip.org/link/JAPIAU/v74/i3/p2071/s1

PUBLICATION DATA

ISSN:

0021-8979 (print)  
1089-7550 (online)

For access to fully linked references, you need to log in.
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  9. T. Sugiyama, Y. Toko, K. Katoh, Y. Iimura, and S. Kobayashi, Jpn. J. Appl. Phys. (to be published).

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