FILTER FOR ELECTRONIC DISPLAY

摘要

Disclosed is a filter for electronic displays which contains a squarylium compound represented by the general formula (I) below. [In the formula, R<SUP>1</SUP> and R<SUP>2</SUP> may be the same or different and represent hydrogen atoms, optionally substituted alkyl groups, optionally substituted aralkyl groups, optionally substituted aryl groups or optionally substituted heterocyclic groups; and X represents the formula (A) below (wherein R<SUP>3</SUP> and R<SUP>4</SUP> may be the same or different and represent hydrogen atoms, optionally substituted alkyl groups, optionally substituted alkoxyl groups, optionally substituted aralkyl groups, optionally substituted aryl groups or optionally substituted heterocyclic groups, and R<SUP>3</SUP> and R<SUP>4</SUP> may form an optionally substituted heterocyclic group together with an adjacent nitrogen atom) or the like.]