Method for measuring gap of liquid crystal cell

Details Method for measuring gap of liquid crystal cell Method for measuring gap of liquid crystal cell

2007-06-12

2007-06-12

Turner, Samuel A. (Department: 2877)

Optics: measuring and testing

Of light reflection

C356S630000, C356S632000

Reexamination Certificate

active

10470015

ABSTRACT:
The polarization angle θ1of a polarizer (14) is set, and the reflection intensity S1in a cross Nicol state and the reference reflection intensity Ref1of a liquid crystal cell (15) are measured. A different polarization angle θ2is then set, and the reflection intensity S2in a cross Nicol state and the reference reflection intensity Ref2of the liquid crystal cell are measured. The rations S1/Ref1,S2/Ref2of measured intensities and the ratio S1·Ref2/S2·Ref1is determined in order to cancel the background components of the reference reflection intensities Ref1,Ref2thus determining the value of cell gap accurately.

REFERENCES:
patent: 4792227 (1988-12-01), Yoshizawa
patent: 02-251710 (1990-10-01), None
patent: 06-331324 (1994-12-01), None
patent: 11-344312 (1999-12-01), None
patent: 2000-321546 (2000-11-01), None
H. Ong, “Optical Properties of General Twisted Nematic Liquid-Crystal Displays”, Applied Physics Letters, Vol. 51, No. 18, pp. 1398-1400, (Nov. 2, 1987).

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