Title:
SCANNING BACKLIGHT WITH SLATLESS LIGHT GUIDE
Document Type and Number:
WIPO Patent Application WO/2012/018745
Kind Code:
A3
Abstract:
A backlight includes a light guide and a first and second light source adapted for independent operation and arranged to inject a first and second light beam, respectively, into the light guide through different portions of the light injection surface. Each light source includes a lamp and a concave reflector to partially collimate light from the lamp. One major surface of the light guide includes prismatic structures that are parallel to a first axis. Another major surface of the light guide includes lenticular structures that are parallel to each other but perpendicular to the prismatic structures. The lenticular structures limit spatial spreading for light that remains in the light guide. Each light source cooperates with the light guide to provide light that is substantially laterally confined to a transverse band of the light guide, even though the light guide contains no gaps that define slats to accomplish such confinement.
Inventors:
AHO ERIK A (US)
SCHULTZ JOHN C (US)
SCHULTZ JOHN C (US)
Application Number:
PCT/US2011/046168
Publication Date:
April 12, 2012
Filing Date:
August 02, 2011
Export Citation:
Assignee:
3M INNOVATIVE PROPERTIES CO (US)
International Classes:
G02F1/13357; G02F1/1333; G02B30/27
Foreign References:
| JP2004227956A | 2004-08-12 | |||
| JPH09147616A | 1997-06-06 | |||
| JP2001266628A | 2001-09-28 | |||
| JP2004207151A | 2004-07-22 |
Other References:
See also references of EP 2601554A4
Attorney, Agent or Firm:
VIETZKE, Lance L. et al. (Office of Intellectual Property Counsel Post Office Box 33427Saint Paul, Minnesota, US)
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