Filters of electronic displays
A filter of an electronic display device provides a clear image, the filter comprising an squarylium compound represent by formula (II): wherein R 15 and R 17 independently represent a hydrogen atom, a halogen atom, substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a nitro group, a cyano group, a hydroxyl group, a substituted or unsubstituted amino group, or a substituted or unsubstituted heterocyclic group; R 16 and R 18 independently represent an alkoxyalkoxyl-substituted alkyl group; R 19 and R 20 independently represent a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a nitro group, a cyano group, a hydroxyl group, a substituted or unsubstituted amino group, or a substituted or unsubstituted heterocyclic group; m represents an integer of 0 to 4, wherein, when m is 2 to 4, R 19 may be the same or different, respectively; and n represents an integer of 0 to 4, wherein, when n is 2 to 4, R 20 may be the same or different respectively.
1. A filter of an electronic display device, said filter comprising a squarylium compound represented by formula (II):
wherein
R 15 and R 17 independently represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a nitro group, a cyano group, a hydroxyl group, a substituted or unsubstituted amino group, or a substituted or unsubstituted heterocyclic group;
R 16 and R 18 independently represent an alkoxyalkoxyl-substituted alkyl group;
R 19 and R 20 independently represent a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a nitro group, a cyano group, a hydroxyl group, a substituted or unsubstituted amino group, or a substituted or unsubstituted heterocyclic group;
m represents an integer of 0 to 4, wherein, when m is 2 to 4, R 19 's may be the same or different, respectively; and
n represents an integer of 0 to 4, wherein, when n is 2 to 4, R 20 's may be the same or different, respectively.
2. The filter according to claim 1 , further comprising a binder.
3. The filter according to claims 1 or 2 , wherein
the alkyl group and alky moieties in the alkoxyl, alkanoyl alkoxylcarbonyl groups is linear or branched C 1 -C 6 alkyl, or C 3 -C 8 cyclic alkyl,
the aralkyl group is C 7 -C 15 ,
the heterocycle in the heterocyclic group is (i) a 5- or 6-membered monocyclic aromatic heterocycle having at least one atom selected from the group consisting of nitrogen, oxygen and sulfur, or a bicyclic or tricyclic condensed aromatic heterocycle in which 3- to 8-membered rings are condensed having at least one atom selected from the group consisting of nitrogen, oxygen or sulfur, or (ii) a 5- or 6-membered monocyclic aliphatic heterocycle having at least one atom selected from the group consisting of nitrogen, oxygen and sulfur, or a bicyclic or tricyclic condensed aliphatic heterocycle in which 3- to 8-membered rings are condensed, having at least one atom selected from the group consisting of nitrogen, oxygen and sulfur,
substituents of the alkyl group, the alkoxyl group, the alkanoyl group and the alkoxycarbonyl group are 1-3 substituents independently selected from the group consisting of hydroxyl, carboxyl, halogen, alkoxyl and alkoxyalkoxyl, and
substituents of the aralkyl group, the aryl group and the heterocyclic group are 1 to 5 substituents independently selected from the group consisting of hydroxyl, carboxyl, halogen, alkyl, alkoxyl, nitro, and amino optionally substituted with one or two alkyl groups.