US Patent 7245434 Light-diffusing sheet, optical element and image display

Patent 7245434 was granted and assigned to Nitto Denko on July, 2007 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Nitto Denko

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7245434

Date of Patent

July 17, 2007

Patent Application Number

10511397

Date Filed

April 22, 2003

Patent Primary Examiner

‌

Stephone B. Allen

Patent abstract

A light-diffusing sheet includes a transparent film and a light-diffusing layer formed on at least one side of the transparent film. The transparent film contains a thermoplastic resin having a substituted and/or non-substituted imido group in a side chain, and a thermoplastic resin having a substituted and/or non-substituted phenyl group and nitrile group in a side chain, and the surface with the minute unevenness has an average height-depth spacing (Sm): Sm≦80 μm, a center-line average surface roughness (Ra): Ra≦0.25 μm and a ten-point average surface roughness (Rz): Rz≦9Ra.