The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 27, 2019
Filed:
Sep. 18, 2015
Applicant:
Koninklijke Philips N.v., Eindhoven, NL;
Inventors:
Eibert Gerjan Van Putten, Eindhoven, NL;
Bart Kroon, Eindhoven, NL;
Assignee:
KONINKLIJKE PHILIPS N.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F21V 8/00 (2006.01); H04N 13/305 (2018.01); G02B 27/22 (2018.01);
U.S. Cl.
CPC ...
G02B 6/0038 (2013.01); G02B 27/2214 (2013.01); H04N 13/305 (2018.05); G02B 6/005 (2013.01); H04N 2213/001 (2013.01);
Abstract
A display backlight comprises an edge-lit waveguide having an array of light out-coupling structures which for example each comprise a projection into the waveguide. Each projection has a beam redirecting face which is at an angle a to the normal. The angle a and the refractive index of the waveguide as well as outside the waveguide (over the output face) are designed to satisfy various relationships, which ensure that the optical output can be selected to be within a desired angular range in a generally forward direction (and thus not clipped).