US 12,244,977 B2
Monitoring position and orientation of a projector
Parry Byron Johnson, Redmond, WA (US); Dmitriy Churin, Redmond, WA (US); and Dmitry Reshidko, Sammamish, WA (US)
Assigned to Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed by Microsoft Technology Licensing, LLC., Redmond, WA (US)
Filed on Jan. 26, 2022, as Appl. No. 17/584,976.
Prior Publication US 2023/0239443 A1, Jul. 27, 2023
Int. Cl. H04N 9/31 (2006.01)
CPC H04N 9/3191 (2013.01) [H04N 9/3161 (2013.01); H04N 9/3176 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A self-correcting projection system, comprising:
an illumination light source configured to emit an illumination light beam;
a monitor light source configured to emit a monitor light beam;
a projector which receives the illumination light beam from the illumination light source and receives the monitor light beam from the monitor light source, the projector including a reflective spatial light modulator configured to modulate the illumination light beam and the monitor light beam to generate a projected combined light beam that contains a projected illumination light beam and a projected monitor light beam;
a display beam path configured to propagate a first portion of the projected combined light beam in a first direction toward an eye of a user, the first portion of the projected combined light beam containing at least a portion of the illumination light beam projected and modulated by the projector, and causing the eye of the user to see a display image corresponding to the modulated illumination light beam;
a monitor beam path configured to propagate a second portion of the projected combined light beam in a second direction toward a monitor camera, the second portion of the projected combined light beam containing at least a portion of the monitor light beam projected by the projector;
the monitor camera configured to receive the second portion of the projected combined light beam and capture a monitor image corresponding to the monitor light beam projected by the projector;
one or more processors; and
one or more computer-readable media having stored thereon computer-executable instructions that, when executed by the one or more processors, cause the projection system to perform at least:
analyze the monitor image to determine an orientation or a position of the monitor image; and
in response to determining that the monitor image is not properly oriented or positioned,
(1) adjust an orientation or a position of the projector, or
(2) adjust an orientation or a position of the illumination image.