US 9,812,494 B2
Methods and apparatus for improving micro-LED devices
Christopher Percival, Cork (IE)
Assigned to Oculus VR, LLC, Menlo Park, CA (US)
Filed by Oculus VR, LLC, Menlo Park, CA (US)
Filed on Oct. 3, 2016, as Appl. No. 15/284,369.
Application 15/284,369 is a continuation of application No. 14/705,607, filed on May 6, 2015, granted, now 9,502,595.
Claims priority of application No. 1408084.0 (GB), filed on May 7, 2014.
Prior Publication US 2017/0025469 A1, Jan. 26, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. H01L 29/15 (2006.01); H01L 27/15 (2006.01); H01L 33/24 (2010.01); H01L 33/32 (2010.01); H01L 31/036 (2006.01); H01L 33/16 (2010.01); H01L 33/20 (2010.01); H01L 33/00 (2010.01); H01L 33/26 (2010.01)
CPC H01L 27/156 (2013.01) [H01L 27/15 (2013.01); H01L 31/036 (2013.01); H01L 33/16 (2013.01); H01L 33/20 (2013.01); H01L 33/24 (2013.01); H01L 33/32 (2013.01); H01L 33/0075 (2013.01); H01L 33/26 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A light emitting diode (LED) device comprising:
a substrate including a light emitting surface and a portion that protrudes in a direction away from the light emitting surface;
a first epitaxial layer over the portion of the substrate that protrudes in the direction away from the light emitting surface;
an active layer over the first epitaxial layer, the active layer generating light that is emitted through the light emitting surface of the substrate responsive to an application of an electrical current to the active layer,
wherein at least one of the substrate and the first epitaxial layer comprises a crystal lattice structure where one or more 1122 planes of the crystal lattice structure is at an angle from a normal to the light emitting surface that is less than an angle of total internal reflection for the LED device.