Optical film, illuminator and display

Details Optical film, illuminator and display Optical film, illuminator and display

2005-12-13

2009-06-16

Pritchett, Joshua L (Department: 2872)

Optical: systems and elements

Diffusing of incident light

Reexamination Certificate

active

07548371

ABSTRACT:
An optical film is provided for use in a light source or display to provide rapid cut-off of illumination with angle. The film comprises a light-transmissive substrate of a material having a reflective index greater than one and having first and second major surfaces. A surface relief is formed on at least one of the major surfaces and includes a mirror structure. The mirror structure comprises a groups of specularly reflective surfaces alternating in at least one direction with groups of transmissive surfaces. The film directs light passing therethrough into a desired angular output range, and light reflected back by the mirror structure is returned to a light source for recycling to enhance display brightness.

REFERENCES:
patent: RE27617 (1973-04-01), Olsen
patent: 4726662 (1988-02-01), Cromack
patent: 6091547 (2000-07-01), Gardiner et al.
patent: 2003/0035231 (2003-02-01), Epstein et al.
patent: 2005/0259198 (2005-11-01), Lubart et al.
patent: 2004-245918 (2004-09-01), None
patent: 2005-031412 (2005-04-01), None

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