Patent ID: 6333592
Filing Date: 2001-12-25
Classification: C03C,G02B

Abstract:
A filter for a plasma display panel comprising:a transparent film base;a first metallic oxide film laminated on said transparent film base;a silver transparent electric-conductor film laminated on said transparent, wherein a laminate unit of said first metallic oxide film and said silver transparent electric-conductor film is successively laminated unit by unit in a number of n units (3.ltoreq.n.ltoreq.10); anda second metallic oxide film formed on a plurality of said laminate units with the number of n;wherein each metallic oxide film has optical transparency of a refractive index of 1.5 to 2.7, and each silver transparent electric-conductor film has a thickness set substantially to a fixed value in a range of from 5 to 20 nm, andwherein one of said first metallic oxide films put directly on the surface of said transparent film base and said second metallic oxide film respectively has a thickness 5/2 (1.+-.0.15) times as large as the thickness of said silver transparent electric-conductor film, and each of other said first metallic oxide films located halfway between said one first metallic oxide film put directly on the surface of said transparent film base and said second metallic oxide film respectively has a thickness 5 (1.+-.0.15) times as large as the thickness of said silver transparent electric-conductor film.