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. 11, 2005
Filed:
Feb. 15, 2002
Hugo Johan Cornelissen, Eindhoven, NL;
Horst Greiner, Aachen, DE;
John Alfred Clarke, Carshalton, GB;
Hugo Johan Cornelissen, Eindhoven, NL;
Horst Greiner, Aachen, DE;
John Alfred Clarke, Carshalton, GB;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A back lighting system for illuminating a display device comprises a light-emitting panel () and a light source () for coupling light into the light-emitting panel. The light source comprises a low-pressure discharge lamp (). The light source additionally comprises a plurality of LEDs (', . . . ) for selectively setting the color temperature of the light emitted by the light source. Preferably, the LEDs increase the color temperature of the light emitted by the light source. Preferably, the light emitted by the back lighting system ranges from 6,000 to 10,500 K. Preferably, the LEDs are blue light emitting LEDs, each preferably having a luminous flux of at least 5 lm. The color point of an image to be displayed on a display screen of the display device is set by the back lighting system, thus enabling an optimum contrast to be achieved for the image to be displayed by the display device.