Method of measuring optical characteristics of liquid crystal ce

Details Method of measuring optical characteristics of liquid crystal ce Method of measuring optical characteristics of liquid crystal ce

1994-12-22

1996-07-02

Pham, Hoa Q.

Optics: measuring and testing

By polarized light examination

356367, 250225, G01J 400

Patent

active

055328237

ABSTRACT:
There is disclosed a method for measuring retardation .DELTA.nd of a liquid crystal cell in which a linearly polarized light beam is impinged upon a liquid crystal cell, the liquid crystal cell is rotated in a plane perpendicular to an optical axis of a measuring optical system so that the transmission through the liquid crystal cell for the light beam having a polarization parallel to that of the incident light beam becomes maximal, the wavelength of the incident light beam is varied to detect at least one wavelength .lambda..sub.s at which the transmission has an extreme and, finally, .DELTA.nd is calculated from .DELTA.nd=.lambda..sub.s .sqroot.m.sup.2 -(1/4) for the case of m-th minimal transmission or from .DELTA.nd=.lambda..sub.s .sqroot.m.sup.2 +m for the case of m-th maximal transmission.

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K. Sumiyoshi et al., "A New Method of TN Cell Gap Measurement" 29p-ZK-16, NEC Corporation Functional Devices Research Lab. (1993).

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