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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.:

US 10522709 B1

PDFFull Text
Date of Patent:
Dec. 31, 2019

Filed:

Dec. 05, 2017

Method of direct wafer mapping by determining operational leds from non-operational leds using photo-reactive elastomer deposition

Applicant:

Facebook Technologies, Llc, Menlo Park, CA (US);

Inventors:

Pooya Saketi, Cork, IE;

Patrick Joseph Hughes, Cork, IE;

David Massoubre, Cork, IE;

Assignee:

Facebook Technologies, LLC, Menlo Park, CA (US);

Attorney:

Fenwick & West LLP

Primary Examiner:

Michael Jung

Int. Cl.
CPC ...
H01L 33/00 (2010.01); H01L 33/62 (2010.01); H01L 33/44 (2010.01); H01L 21/67 (2006.01); H01L 21/68 (2006.01); H01L 21/66 (2006.01); H01L 25/075 (2006.01); H01L 33/48 (2010.01);
U.S. Cl.
CPC ...
H01L 33/0079 (2013.01); H01L 21/6715 (2013.01); H01L 21/67144 (2013.01); H01L 21/681 (2013.01); H01L 22/20 (2013.01); H01L 25/0753 (2013.01); H01L 33/44 (2013.01); H01L 33/48 (2013.01); H01L 33/62 (2013.01); H01L 2933/0025 (2013.01); H01L 2933/0066 (2013.01);
Abstract

LEDs are manufactured on a substrate layer and picked and placed using a pick-up tool (PUT) onto a target substrate. The PUT typically attaches to an LED via an elastomer layer deposited on a surface of the LED. A given batch of manufactured LEDs may contain operational LEDs as well as non-operational LEDs. In order to separate the operational and non-operational LEDs, the LEDs are placed on a unidirectional conductive film. A photo-curable polymer is deposited on a surface of each LED. A voltage difference is applied across the electrodes of each LED via the unidirectional conductive film, causing the operational LEDs to emit light and cure the photo-curable polymer to form an elastomer layer, while the polymer deposited on the non-operational LEDs will not cure. As such, the PUT will be able to pick up the operational LEDs, while being unable to pick up the non-operational LEDs.

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