US 11,722,654 B1
Angle sensing using the Talbot effect, an imaging sensor, and phase/quadrature demodulation
Michael Scott Sutton, Arvada, CO (US); James P. Terrell, Jr., Bellevue, CO (US); Dmitriy Churin, Redmond, WA (US); Ishan Chatterjee, Redmond, WA (US); and Rayna Demaster-Smith, Redmond, WA (US)
Assigned to MICROSOFT TECHNOLOGY LICENSING, LLC, Redmond, WA (US)
Filed by MICROSOFT TECHNOLOGY LICENSING, LLC, Redmond, WA (US)
Filed on May 31, 2022, as Appl. No. 17/829,325.
Int. Cl. H04N 13/327 (2018.01); G02B 27/42 (2006.01); H04N 13/344 (2018.01); H04N 25/00 (2023.01); H04N 13/00 (2018.01)
CPC H04N 13/327 (2018.05) [G02B 27/4233 (2013.01); H04N 13/344 (2018.05); H04N 25/00 (2023.01); H04N 2013/0081 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A device to sense a change in alignment of a display, the device comprising:
a Talbot sensor that is positioned about the display, the Talbot sensor comprising:
a diffraction device with an array of apertures arranged along a first axis according to a first periodicity; and
an image sensor with an array of image pixels arranged along the first axis according to a second periodicity, wherein the image sensor is configured to capture an image of incident light that passes through one or more of the apertures of the diffraction device and output an array of values for the captured image; and
a demodulator that is configured to receive the captured image from the Talbot sensor and demodulate the image capture relative to a reference diffraction pattern to generate an in-phase (I) averaged value and a quadrature (Q) averaged values, and compute a phase angle between the in-phase (I) and quadrature (Q) averaged values, wherein the phase angle indicates an image alignment difference associated with the display.