Invention Grant
- Patent Title: Direct-lit backlight with angle-dependent birefringent diffuser
- Patent Title (中): 带角度的双折射扩散器的直射背光
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Application No.: US11843178Application Date: 2007-08-22
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Publication No.: US08007118B2Publication Date: 2011-08-30
- Inventor: Mark B. O'Neill , Carl A. Stover , Michael F. Weber
- Applicant: Mark B. O'Neill , Carl A. Stover , Michael F. Weber
- Applicant Address: US MN St. Paul
- Assignee: 3M Innovative Properties Company
- Current Assignee: 3M Innovative Properties Company
- Current Assignee Address: US MN St. Paul
- Agent Robert S. Moshrefzaden
- Main IPC: G02B5/30
- IPC: G02B5/30 ; F21V9/14

Abstract:
A direct-lit backlight includes a diffuse reflector disposed in front of a light source. The diffuse reflector has a continuous phase material and a disperse phase material, at least one of which is birefringent, and the disperse phase material is formed into particles having a transverse dimension less than 1 micrometer for efficient visible light scattering. The continuous and disperse phases have refractive indices tailored so the diffuse reflector transmits light from the light source substantially more strongly for obliquely incident light than for normally incident light to provide bulb-hiding characteristics.
Public/Granted literature
- US20080055881A1 DIRECT-LIT BACKLIGHT WITH ANGLE-DEPENDENT BIREFRINGENT DIFFUSER Public/Granted day:2008-03-06
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