Near Infrared Ray Absorbing Filter, Optical Filter for Plasma Display and Plasma Display Panel
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United States of America Patent
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Issued Date -
Jan 8, 2009
app pub date -
Feb 15, 2006
filing date -
Feb 16, 2005
priority date (Note) -
Abandoned
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Abstract
A near infrared ray absorbing filter is a film gained by biaxially oriented polyester having a near infrared ray absorbing agent, and the melting point of this polyester is no higher than 230° C. The optical filter for a plasma display is provided with a near infrared ray blocking layer made of polyester containing a near infrared ray absorbing agent and an image quality correcting layer made of polyester containing a compound which absorbs visible light having an absorption maximum wavelength in a range from 560 nm to 600 nm. These layers are layered through an integrated process by means of a co-extrusion method, according to which these layers are melted and extruded together from a co-extrusion process, and thus, a biaxially oriented film is formed. The melting point of the polyester in these layers is no higher than 230° C.
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