US 11,706,853 B2
Monitoring an emission state of light sources
Mike Voong, Daly City, CA (US); and Martin Francis Galinski, III, Santa Clara, CA (US)
Assigned to Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed by Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed on Oct. 6, 2021, as Appl. No. 17/450,154.
Prior Publication US 2023/0105312 A1, Apr. 6, 2023
Int. Cl. H05B 45/14 (2020.01); G06F 3/01 (2006.01)
CPC H05B 45/14 (2020.01) [G06F 3/013 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A light emitting circuit comprising:
a power source;
one or more light sources connected to an output of the power source;
a control circuit comprising a pulsed voltage source, and a control transistor configured to regulate a current through the one or more light sources based upon an output of the pulsed voltage source;
a monitor transistor comprising a gate connected to an output of the one or more light sources such that a voltage at the output of the one or more light sources controls an output of the monitor transistor; and
a monitor transistor detector connected to the output of the monitor transistor, the monitor transistor detector configured to monitor a state of the one or more light sources based upon a state of the output of the monitor transistor.