US 11,915,508 B2
Ultrasonic fingerprint sensor technologies and methods for bi-directional fingerprint sensing
Rakesh Pallerla, Hyderabad (IN); Hrishikesh Vijaykumar Panchawagh, Cupertino, CA (US); Prakash Tiwari, Hyderabad (IN); and Naga Chandan Babu Gudivada, Hyderabad (IN)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Dec. 5, 2022, as Appl. No. 18/061,938.
Application 18/061,938 is a continuation of application No. 17/443,936, filed on Jul. 28, 2021, granted, now 11,580,770.
Prior Publication US 2023/0097300 A1, Mar. 30, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G06V 40/13 (2022.01); B06B 1/06 (2006.01); H04M 1/02 (2006.01)
CPC G06V 40/1306 (2022.01) [H04M 1/026 (2013.01); H04M 2250/22 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a portion of a first ultrasonic fingerprint sensing system including:
a first sensor pixel layer,
a first piezoelectric layer, and
a first electrode layer,
a portion of a second ultrasonic fingerprint sensing system including:
a second sensor pixel layer,
a second piezoelectric layer, and
a second electrode layer; and
a single common controller, wherein:
the first sensor pixel layer includes a plurality of first sensor pixels, each first sensor pixel configured to, in conjunction with the first electrode layer, measure an amount of charge generated within the first piezoelectric layer responsive to transit of an ultrasonic wave therethrough,
the second sensor pixel layer includes a plurality of second sensor pixels, each second sensor pixel configured to, in conjunction with the second electrode layer, measure an amount of charge generated within the second piezoelectric layer responsive to transit of an ultrasonic wave therethrough,
at least the first sensor pixel layer and the second sensor pixel layer are both operatively connected with the single common controller,
the portion of the first ultrasonic fingerprint sensing system is located proximate to a first side of the apparatus,
the portion of the second ultrasonic fingerprint sensing system is located proximate to a second side of the apparatus opposite the first side of the apparatus, and
the single common controller is configured to:
cause the first sensor pixel layer to obtain a fingerprint scan from the first side of the apparatus by scanning the first sensor pixels for measured charge amounts, and
cause the second sensor pixel layer to obtain a fingerprint scan from the second side of the apparatus by scanning the second sensor pixels for measured charge amounts.