Patent ID: 8728591

Claim:
A polarizing plate comprising a polymer film comprising at least one compound represented by formula (I) and formula (I′): in the formulae (I) and (I′), R 1 represents a C 1-6 unsubstituted alkyl group or C 6-12 unsubstituted aryl group; Y represents a C 1-6 substituted or unsubstituted alkylene group, or substituted or unsubstituted arylene group, where, given that Y represents a substituted or unsubstituted alkylene group, and optionally, one carbon atom, or two or more non-adjacent carbon atoms in the alkylene group may be substituted by oxygen atom(s); n represents an integer of 1 to 3, and for n=1, R 3 represents a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group, and optionally, one carbon atom, or two or more non-adjacent carbon atoms in the substituted or unsubstituted alkyl group may be substituted by oxygen atom(s), and for n=2 to 3, R 3 represents an n-valent linking group composed of one or more atoms; and for n=2 or larger, n merocyanine units A may be same or different.