Semiconductor device manufacturing: process – Making device or circuit emissive of nonelectrical signal – Including integrally formed optical element
Reexamination Certificate
2008-09-18
2010-12-28
Malsawma, Lex (Department: 2892)
Semiconductor device manufacturing: process
Making device or circuit emissive of nonelectrical signal
Including integrally formed optical element
C438S030000, C257S089000, C257SE21001, C257SE33001
Reexamination Certificate
active
07858409
ABSTRACT:
A backlight for a color LCD includes white light LEDs formed using a blue LED die with a layer of red and green phosphors over it. The attenuation by the LCD layers of the blue light component of the white light is typically greater as the blue wavelength becomes shorter. In order to achieve a uniform blue color component across the surface of an LCD screen and achieve uniform light output from one LCD to another, the blue light leakage of the phosphor layer is tailored to the dominant or peak wavelength of the blue LED die. Therefore, the white points of the various white light LEDs in a backlight should not match when blue LED dies having different dominant or peak wavelengths are used in the backlight. The different leakage amounts through the tailored phosphor layers offset the attenuation vs. wavelength of the LCD layers.
REFERENCES:
patent: 6274399 (2001-08-01), Kern et al.
patent: 6649440 (2003-11-01), Krames et al.
patent: 7352011 (2008-04-01), Smits et al.
patent: 7452737 (2008-11-01), Basin et al.
patent: 2005/0269582 (2005-12-01), Mueller et al.
patent: 2007/0096131 (2007-05-01), Chandra
patent: 2007/0215890 (2007-09-01), Harbers et al.
patent: 2008/0036364 (2008-02-01), Li et al.
patent: 2008/0048200 (2008-02-01), Mueller et al.
patent: 2008/0315228 (2008-12-01), Krames et al.
patent: 2009/0128460 (2009-05-01), Roberts et al.
patent: 2009/0129074 (2009-05-01), Roberts et al.
patent: 2009064361 (2009-05-01), None
patent: 2009064363 (2009-05-01), None
Bierhuizen Serge
Kessels Marcus J. H.
Mueller Gerd
Smitt Willem Sillevis
Koninklijke Philips Electronics , N.V.
Malsawma Lex
Philips Lumileds Lighting Company LLC
LandOfFree
White point compensated LEDs for LCD displays does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with White point compensated LEDs for LCD displays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and White point compensated LEDs for LCD displays will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4212955