Color correction for wafer level white LEDs

Details Color correction for wafer level white LEDs Color correction for wafer level white LEDs

2011-03-01

2011-03-01

Picardat, Kevin M (Department: 2822)

Semiconductor device manufacturing: process

Making device or circuit emissive of nonelectrical signal

Packaging or treatment of packaged semiconductor

C438S028000, C438S029000, C257S088000, C257S089000, C257S098000

Reexamination Certificate

active

07897419

ABSTRACT:
A method for fabricating a plurality of LED chips comprises providing a plurality of LEDs and forming a plurality of spacers each of which is on at least one of the LEDs. Coating the LEDs with a conversion material, each of the spacers reducing the amount of conversion material over its one of the LEDs. This reduction causes the plurality of LED chips to emit a wavelength of light in response to an electrical signal that is within a standard deviation of a target wavelength. LEDs, LED chips and LED chip wafers are fabricated using the method according to the present invention. One embodiment of an LED chip wafer according to the present invention comprises a plurality of LEDs on a wafer and a plurality of a spacers, each of which is on a respective one of the LEDs. A conversion material at least partially covers the LEDs and spacers, with at least some light from the LEDs passing through the conversion material and is converted. The spacers cause the LED chips to emit light having a wavelength within a standard deviation compared to the similar LED chips without the spacers where at least some of the LED chips emit light a wavelength of light outside the standard deviation.

REFERENCES:
patent: 4946547 (1990-08-01), Palmour et al.
patent: 5200022 (1993-04-01), Kong et al.
patent: RE34861 (1995-02-01), Davis et al.
patent: 5554911 (1996-09-01), Nakayama et al.
patent: 5949188 (1999-09-01), Leising et al.
patent: 6117529 (2000-09-01), Leising et al.
patent: 6541130 (2003-04-01), Fukuda
patent: 6576931 (2003-06-01), Furukawa et al.
patent: 6878297 (2005-04-01), Berger et al.
patent: 7518141 (2009-04-01), Nakamura
patent: 7667388 (2010-02-01), Ryu
patent: 2002/0171911 (2002-11-01), Maegawa
patent: 2003/0089918 (2003-05-01), Hiller et al.
patent: 2004/0233139 (2004-11-01), Asano et al.
patent: 2006/0061259 (2006-03-01), Negley
patent: 2006/0099449 (2006-05-01), Amano et al.
patent: 2006/0258028 (2006-11-01), Paolini et al.
patent: 2008/0173886 (2008-07-01), Cheon et al.
patent: 2008/0179611 (2008-07-01), Chitnis et al.
patent: 2009/0173957 (2009-07-01), Brunner et al.
patent: 2010/0081218 (2010-04-01), Hardin
patent: 11980106 (2002-04-01), None
patent: 1811581 (2007-07-01), None
patent: 1855320 (2007-11-01), None
patent: 1975685 (2008-10-01), None
patent: 2007049187 (2007-05-01), None
U.S. Appl. No. 11/656,759, filed Jan. 22, 2007.
U.S. Appl. No. 11/899,790, filed Sep. 7, 2007.
U.S. Appl. No. 61/072,546, filed Mar. 31, 2008.
Cree® EZ1000™ LEDs Data Sheet, Cree's EZBright™ LEDs, 2007.
Cree® EZ700™ LEDs Data Sheet, Cree'S EZBright™ LEDs, 2007.
Cree® EZ400™ LEDs Data Sheet, Cree'S EZBright™ LEDs.pp. 1-5, 2007.
Cree® EZBright29O™ LEDs Data Sheet, Cree's EZBright™ LEDs, 2007.
PCT International Search Report and Written Opinion from PCT/US2009/006625, Date: Sep. 6, 2010.

Affiliated with

Also associated with

Rating

Color correction for wafer level white LEDs does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Color correction for wafer level white LEDs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color correction for wafer level white LEDs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2683455