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:
Mar. 03, 2020
Filed:
May. 30, 2018
Applicant:
Lumileds Holding B.v., Schiphol, NL;
Inventor:
Chunxia Feng, Shanghai, CN;
Assignee:
Lumileds Holding B.V., Schipol, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F21V 7/28 (2018.01); F21V 5/04 (2006.01); F21V 3/02 (2006.01); F21V 5/00 (2018.01); F21V 13/04 (2006.01); G02B 19/00 (2006.01); G02F 1/1335 (2006.01); F21Y 115/10 (2016.01);
U.S. Cl.
CPC ...
F21V 7/28 (2018.02); F21V 3/02 (2013.01); F21V 5/007 (2013.01); F21V 5/048 (2013.01); F21V 13/04 (2013.01); G02B 19/0014 (2013.01); G02B 19/0028 (2013.01); G02B 19/0061 (2013.01); G02F 1/133606 (2013.01); F21Y 2115/10 (2016.08); G02F 1/133603 (2013.01); G02F 2001/133607 (2013.01);
Abstract
Optical lens and light emitting device designs achieve uniform light distribution without producing a light 'hot spot', with a benefit of reducing the number of light sources needed and overall cost for direct-lit backlight device. The optical lens includes coating portions or structures on the bottom surface thereof, and a backlight device, or other light emitting device, incorporating said lens, to produce a uniform distribution of light at a target surface. The disclosed lens and light emitting device are particularly useful when an extremely wide transfer function of backlight is needed.