Illumination – Revolving
Reexamination Certificate
2005-01-11
2005-01-11
Cariaso, Alan (Department: 2875)
Illumination
Revolving
C362S228000, C362S230000, C362S295000
Reexamination Certificate
active
06840646
ABSTRACT:
A back lighting system for illuminating a display device comprises a light-emitting panel (1) and a light source (6) for coupling light into the light-emitting panel. The light source comprises a low-pressure discharge lamp (6; 7). The light source additionally comprises a plurality of LEDs (8, 8′, . . . ; 9, 9′, . . . ) 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.
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German Utility Model No. 200 07 134 U1, Published Sep. 21, 2000, “Lighting Unit with Adjustable Chromaticity Coordinate”, Translation by Ralph McElroy Translation Company, pp. 1-6.*
Derwent Abstract 2000-588568, Aug. 17, 2000, Patent-Treuhand-Ges Elektrische Gluehlam, English Abstract.
Clarke John Alfred
Cornelissen Hugo Johan
Greiner Horst
Cariaso Alan
Koninklijke Philips Electronics , N.V.
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