Squarylium compounds, filters for plasma display panels employing them, and plasma display panel devices
AssigneeMitsubishi Chemical Corporation
InventorsTetsuo Ozawa, Tetsuo Murayama
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Abstract
Coloring matters and filters for plasma display panels, which can effectively screen the neon emission radiated from plasma display panels. Squarylium compounds represented by the following formula (I): [in the formula (I), R is a halogen atom, an alkyl group which may have a substituent, an alkoxy group which may have a substituent, or an alkenyl group which may have a substituent, m is an integer of from 1 to 4, and n is an integer of from 0 to 4], and filters for plasma display panels, made by laminating layers containing these compounds with layers containing ultraviolet absorbers and, if necessary, providing additionally near infrared screening layers, antireflection layers and/or non-glare layers.
Claims20
A squarylium compound having the formula (I):
- wherein R is C1-20 linear or branched alkoxy which is optionally substituted;
- m is an integer of from 1 to 4;
- and n is an integer of from 1 to 4.
A squarylium compound having formula (I):
- wherein m is 3, n is 1 and R is alkyl which is optionally substituted.
A squarylium compound having the formula (I):
- Wherein m is 2, n is 1, and R is —OCH3 or n-OC4H9.
A filter for a plasma display panel, comprising a layer containing an ultraviolet absorber laminated on a layer containing one or more squarylium compounds of the formula (I′):
- wherein:
- R is halogen, alkyl which is optionally substituted, alkoxy which is optionally substituted, or alkenyl which is optionally substituted;
- m′ is an integer of from 1 to 4;
- and n′ is an integer of from 0 to 4.
A filter for a plasma display panel, comprising a layer which contains one or more squarylium compounds having the formula (I):
- wherein:
- R is halogen, alkyl which is optionally substituted, alkoxy which is optionally substituted, or alkenyl which is optionally substituted;
- m is an integer of from 1 to 4;
- and n is an integer of from 1 to 4 and which further comprises a glare-preventing (non-glare) layer.
Dependencies are inferred from the claim text.