US 12,072,487 B2
Method for manufacturing a microLED based illumination structure comprising infrared micro light emitting devices
Aswathi Sudhir, Sunnyvale, CA (US); David Charles Rohn, Fort Collins, CO (US); and James Peele Terrell, Bellvue, CO (US)
Assigned to Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed by MICROSOFT TECHNOLOGY LICENSING, LLC, Redmond, WA (US)
Filed on Jan. 27, 2023, as Appl. No. 18/102,538.
Application 18/102,538 is a continuation of application No. 17/830,672, filed on Jun. 2, 2022, granted, now 11,579,444.
Prior Publication US 2023/0393388 A1, Dec. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 27/00 (2006.01); G02F 1/1333 (2006.01); G02F 1/13357 (2006.01)
CPC G02B 27/0093 (2013.01) [G02F 1/133314 (2021.01); G02F 1/133377 (2013.01); G02F 1/1336 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of manufacturing a transparent illumination structure with a plurality of IR μLEDs (infrared micro light emitting devices), the method comprising:
obtaining a transparent backplane;
applying a plurality of traces to the transparent backplane, the plurality of traces being electrically conductive and forming at least one electrical circuit between an anode terminal and a cathode terminal;
obtaining a wafer containing a plurality of IR μLEDs;
transferring a set of one or more IR μLEDs from the wafer onto the transparent backplane in a predetermined pattern, the set of one or more IR μLEDs being positioned directly onto the traces, each IR μLED in the set of one or more IR μLEDs being electrically coupled with the at least one electrical circuit;
separating a segment of the transparent backplane from a remaining portion of the transparent backplane, the segment of the transparent backplane including the least one electrical circuit with the set of one or more IR μLEDs; and
electrically and mechanically coupling the segment of the transparent backplane to an HMD (head-mounted display) as an illumination lens comprising the set of one or more IR μLEDs, the illumination lens being configured to emit IR light toward an eye of a user for facilitating eye tracking of the eye of the user by the HMD, the HMD being configured to perform the eye tracking based on detecting and processing IR light reflected from the eye of the user that is emitted from the set of one or more IR μLEDs of the illumination lens.