Patent ID: 11928795
Assignee: GOOGLE LLC
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 17:
18. A user device comprising:
a display system comprising:
a display screen; and
a pulse-width modulation circuit;

a sensor embedded under the display screen;
one or more processors; and
one or more computer-readable media having instructions thereon that, responsive to execution by the one or more processors, are configured to:
perform a principal component analysis on one or more background images associated with the sensor embedded under the display screen of the display system, the principal component analysis effective to reveal an artifact associated with pulse-width modulated (PWM) noise in the one or more background images;
determine PWM noise based at least in part on an extraction of principal component vectors from the artifact associated with PWM noise in the one or more background images;
responsive to the determination the PWM noise, vectorize the PWM noise to create a PWM noise vector;
illuminate, with light emitted from the display system, a user touch at the display screen, the illumination effective to produce a reflection of light associated with skin of a user;
capture the reflection of light at the sensor to provide a user-associated image;
project the user-associated image onto a vector space, the vector space being associated with the PWM noise vector to provide the user-associated image on the vector space; and
based on the user-associated image on the vector space, filter out the PWM noise from the user-associated image to provide a reduced-noise image.