Electrode structure for removing field-induced disclination line

Details Electrode structure for removing field-induced disclination line Electrode structure for removing field-induced disclination line

1989-12-26

1992-01-28

Hille, Rolf

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 89, 359 92, G02F 113

Patent

active

050847783

ABSTRACT:
A liquid crystal device includes at least one pixel electrode, formed on a transparent substrate, and having opposed first and second sides edges. A transparent cover glass is disposed in parallel alignment with the substrate and has a ground plane formed thereon opposite to the pixel electrode. A multiplicity of liquid crystal molecules is sealably contained between the substrate and cover glass. In one embodiment, a field control electrode (FCE) is formed on the substrate proximate to the pixel electrode first side edge. A voltage of proper polarity and magnitude may be applied to the FCE relative to the ground plane electrode to avoid a disclination line (mobile inversion wall) proximate to the pixel electrode first side edge when another voltage of proper polarity and magnitude is applied to the pixel electrode relative to the ground plane electrode. In an alternate embodiment, the ground plane electrode may be patterned to straighten the electric field between the pixel electrode and ground plane electrode to avoid a disclination line (mobile inversion wall) when the pixel is energized.

REFERENCES:
patent: 4247174 (1981-01-01), Walter
patent: 4617646 (1986-10-01), Yang
Surface Pinning of Disclinations and the Stability of Bistable Nematic Storage Display J. Appl. Physic 52(2), Feb. 1981.
Field Effects in Nematic Liquid Crystal . . . J. Appl. Physics, U.S., 12/74.
V. A. Stieb et al., Inversionswande in Dielektrisch Deformierten Flussigkristallschichten, Berichte der Bunsen-Gesellschaft 78 No. 9, pp. 899-902 (1974). (English translation also attached).

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