Importance

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Abstract

In a polarizing plate grading method a first measurement range A.sub.1 is chosen on a polarizing plate. After conducting an initial measurement by putting the polarizing plate under X.sub.1.degree. C. for Y.sub.1 hours, the first measurement range is measured to obtain the maximum chromatic value Z.sub.1max (NIT,cd/m), and the minimum chromatic value Z.sub.1min. The minimum value is subtracted from the maximum value to obtain the net chromatic difference value W.sub.1. The temperature change measurement is conducted by putting the polarizing plate under X.sub.2.degree. C. for Y.sub.2 hours and, then, the recovery measurement is conducted on the polarizing plate by putting the polarizing plate under X.sub.3.degree. C. for Y.sub.3 hours. A first measurement range is measured to obtain the maximum chromatic value Z.sub.3max and the minimum chromatic value Z.sub.3min. The minimum chromatic value is subtracted from the maximum chromatic value to obtain the net chromatic difference value W.sub.3. The polarizing plate grading index Q is obtained by dividing the value obtained from subtracting the net chromatic difference value W.sub.1 obtained in the initial measurement from the net chromatic difference value W.sub.3 obtained in the recovery measurement, by the net chromatic difference value W.sub.1 so as to grade the polarizing plates.

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First Claim