Light-diffusing films, backlight display devices comprising the light-diffusing films, and methods of making the same

US7297380B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• Christopher Coenjarts · Evansville, US
• Jianbo Di · Palatine, US
• John Frederick Graf · Ballston Lake, US
• Emine Elif Gurel · Evansville, US
• David L. Hartter · Pittsfield, US
• Grant Hay · Niskayuna, US
• Todd M. Loehr · Evansville, US
• Philip Peters · Greenwood, US
• Joseph Riello · Pittsfield, US
• Shixiong Zhu · Evansville, US

Key dates

• Filing date: May 20, 2005
• Grant date: Nov 20, 2007
• Expiry date: May 20, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/26
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A light-diffusing film comprises about 90 wt. % to about 99.999 wt. % polycarbonate, wherein the polycarbonate comprises a yellowness index of about 0.8 to about 1.5 as measured in accordance with ASTM E313-73 (D1925); about 0.001 wt. % to about 3 wt. % light-diffusing particles; wherein weight percents are based on a total weight of the light-diffusing film; and wherein the light-diffusing film comprises a light transmission of about 45% to about 65% as measured in accordance with ASTM D1003-00, and a hiding power of 0 to about 0.5.