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:
Jan. 22, 2008
Filed:
May. 07, 2004
Robert S. West, Wixom, MI (US);
Simon Kuppens, Geldrop, NL;
Charles Schrama, Waalre, NL;
Yourii Martynov, Eindhoven, NL;
Nicola Pfeffer, Eindhoven, NL;
Huub Konijn, Huizen, NL;
Robert S. West, Wixom, MI (US);
Simon Kuppens, Geldrop, NL;
Charles Schrama, Waalre, NL;
Yourii Martynov, Eindhoven, NL;
Nicola Pfeffer, Eindhoven, NL;
Huub Konijn, Huizen, NL;
Philips Lumileds Lighting Company, LLC, San Jose, CA (US);
Abstract
A backlight uses an array of red, green, and blue LEDs in a mixing chamber. The mixing chamber has reflecting surfaces and a top opening for illuminating LCD layers. A desired brightness profile and better color uniformity are obtained by using techniques including arranging the LEDs in certain sequences and patterns, providing a specular ring at the base of each LED, attenuating the brightness of the LEDs at the edges, and using widely separated diffusers in the mixing chamber. The arrangement, selection, and control of the multicolored LEDs may be tailored to achieve any desired white point specified by the display manufacturer.