Filters for electronic display device

Details Filters for electronic display device Filters for electronic display device

2003-01-22

2004-11-16

Powers, Fiona T. (Department: 1626)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

With viewing layer of specified composition

C548S364100

Reexamination Certificate

active

06818262

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a filter for an electronic display device which can selectively shield the light having such a wavelength that reduces the color purity.
BACKGROUND OF THE INVENTION
An electronic display device displays color images by a combination of three primary colors: red, blue, and green. However, in actual devices, there was a problem that images with low color purity are made because of containing additional lights other than the three primary colors (e.g. for plasma display panels, the additional lights are those of 550-600 nm: neon emission). To solve this problem, it has been devised to equip the devices with a filter having a color compensating function. It is known to use a squarylium compound as a pigment for a filer for an electronic display device. For example, Japanese Published Unexamined Patent Application No. 192350/01 discloses a plasma display panel which contains a squarylium compound represented by the following formula, or the like.
However, the above plasma display panel is not practically satisfactory in that a transmittance of the light is insufficient at a wavelength region around 500 nm.
OBJECTS OF THE INVENTION
An object of the present invention is to provide a filter for an electronic display device which can selectively shield the light having such a wavelength that reduces the color purity, and thereby can provide clear images.
SUMMARY OF THE INVENTION
The present invention provides the following [1]-[7]:
[1] A filter for an electronic display device comprising a squarylium compound represented by the general formula (I):
wherein X represents a nitrogen atom or an oxygen atom; Q represents a carbon atom, a nitrogen atom, an oxygen atom or a sulfur atom; R
1
represents a hydrogen atom, an alkyl group optionally having substituent(s), an aryl group optionally having substituent(s), an aralkyl group optionally having substituent(s), or a heterocycle group optionally having substituent(s), provided that when X is an oxygen atom, then R
1
is absent; R
2
represents a hydrogen atom, a halogen atom, an alkyl group optionally having substituent(s), an alkoxyl group optionally having substituent(s), an aralkyl group optionally having substituent(s), an aryl group optionally having substituent(s), a nitro group, a cyano group, a hydroxyl group, an amino group optionally having substituent(s), or a heterocycle group optionally having substituent(s); R
3
and R
4
are the same or different, and represent a hydrogen atom, an alkyl group optionally having substituent(s), an aryl group optionally having substituent(s), an aralkyl group optionally having substituent(s), or a heterocycle group optionally having substituent(s), or R
3
and R
4
may be taken together with an adjacent carbon atom to form an alicyclic hydrocarbon ring optionally having substituent(s), or an heterocyclic ring optionally having substituent(s), provided that when Q is a nitrogen atom, then R
4
is absent and, when Q is an oxygen atom or a sulfur atom, then R
3
and R
4
are absent; R
5
represents a hydrogen atom, an alkyl group optionally having substituent(s), an aryl group optionally having substituent(s), an aralkyl group optionally having substituent(s), or a heterocycle group optionally having substituent(s); R
6
represents a halogen atom, an alkyl group optionally having substituent(s), an alkoxyl group optionally having substituent(s), an aralkyl group optionally having substituent(s), an aryl group optionally having substituent(s), a nitro group, a cyano group, a hydroxyl group, an amino group optionally having substituent(s), or a heterocycle group optionally having substituent(s); and m represents an integer of 0-2, wherein when m is 2, then respective R
6
s may be the same or different, or further two R
6
s may be taken together with two carbon atoms to which each R
6
is adjacent to form an aromatic ring optionally having substituent(s).
[2] A filter for an electronic display device comprising a squarylium compound represented by the general formula (Ia):
wherein R
2
, R
3
, R
4
and R
5
are as defined above, respectively; R
7
represents a halogen atom, an alkyl group optionally having substituent(s), an alkoxyl group optionally having substituent(s), an aralkyl group optionally having substituent(s), an aryl group optionally having substituent(s), a nitro group, a cyano group, a hydroxyl group, an amino group optionally having substituent(s), or a heterocycle group optionally having substituent(s); and n represents an integer of 0-4, wherein when n is 2-4, then respective R
7
s may be the same or different, or further adjacent two R
7
s may be taken together with two carbon atoms to which each R
7
is adjacent to form an aromatic ring optionally having substituent(s).
[3] A filter for an electronic display device comprising a squarylium compound represented by the general formula (Ib):
wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
7
and n are as defined above, respectively.
[4] A filter for an electronic display device comprising a squarylium compound represented by the general formula (Ic):
wherein R
1
, R
2
, R
5
, R
7
and n are as defined above, respectively.
[5] A filter for an electronic display device comprising a squarylium compound represented by the general formula (Id):
wherein R
1
, R
2
, R
3
, R
5
and R
7
are as defined above, respectively; Y
1
and Y
2
are the same or different, and represent a carbon atom or a nitrogen atom; and na represents an integer of 0-4, provided that when one of Y
1
and Y
2
is a nitrogen atom and the other is a carbon atom; then na represents an integer of 0-3, and when both of Y
1
and Y
2
are nitrogen atoms, then na represents an integer of 0-2.
[6] The filter for an electronic display device according to any one of [1]-[5], which further comprises a binder.
[7] A squarylium compound represented by the general formula (Ia):
wherein R
2
, R
3
, R
4
, R
5
, R
7
and n are as defined above, respectively.
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the compound represented by the general formula (I) is referred to as compound (I). Compounds with other formula numbers are also expressed in the same manner.
In the definition of each group in the general formula (I) and general formulas (Ia)-(Id), examples of the alkyl group and an alkyl moiety in the alkoxyl group include linear or branched alkyl groups having 1-6 carbon atom(s) and cyclic alkyl groups having 3-8 carbon atoms, specifically, such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, an isopentyl group, a 2-methylbutyl group, a tert-pentyl group, a hexyl group, a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group and a cyclooctyl group.
Examples of the aralkyl group include aralkyl groups having 7-15 carbon atoms, specifically, such as a benzyl group, a phenethyl group, a phenylpropyl group and a naphthylmethyl group.
Examples of the aryl group include a phenyl group, a naphthyl group, an anthryl group, and the like.
Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
Examples of the aromatic ring formed by two R
6
s taken together with two carbon atoms to which each R
6
is adjacent, and the aromatic ring formed by adjacent two R
7
s taken together with two carbon atoms to which each R
7
is adjacent, include an aromatic heterocyclic ring described below and the like, in addition to a benzene ring, a naphthalene ring and the like.
Examples of the heterocyclic ring in the heterocycle group and the heterocyclic ring formed by R
3
and R
4
taken together with an adjacent carbon atom, include an aromatic heterocyclic ring and an alicyclic heterocyclic ring.
Examples of the aromatic heterocyclic ring include 5- or 6-membered monocyclic aromatic heterocyclic rings containing at least one atom selected

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