Rubbing apparatus including double refraction phase difference m

Details Rubbing apparatus including double refraction phase difference m Rubbing apparatus including double refraction phase difference m

1993-04-28

1994-05-24

Gross, Anita P.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 62, G02F 11335, G02F 11337

Patent

active

053154215

ABSTRACT:
An apparatus for measuring the double refractive phase difference of an orientation film formed on an electrode substrate is disclosed. The apparatus provided with a laser generating two linearly polarized beams having optical electric fields perpendicular to each other and to the direction of the propagation, beam splitter for splitting the light transmitted through the substrate into two, detectors for detecting a component of 45.degree. to the x-y plane included in one of the two splitted lights and a component in the x or y direction included in the other splitted light and calculation circuit for calculating the double refractive phase difference of an orientation film based on detected values of these two components. The rubbing conditions are controlled in accordance with the double refractive phase difference measured.

REFERENCES:
patent: 3744920 (1973-07-01), Adams et a.
"The Mechanism of polymer alignment of liquid-crystal materials", Geary et al., J. Appl. Phys. 62(10), 15 Nov. 1987, pp. 4100-4108.

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