Configuration of an ultrasonic fingerprint sensor relative to a display of a device

A device comprising:

• a flexible display that includes a cover layer, an adhesive film layer, a glass layer, and a backing layer, wherein
• the adhesive film layer is situated between the cover layer and the glass layer, wherein
• the flexible display is a foldable display, and wherein
• the backing layer includes a recess;
• an ultrasonic fingerprint sensor that is configured to transmit and receive an ultrasonic signal in an acoustic path through the flexible display, wherein
• the ultrasonic fingerprint sensor is positioned within the recess;
• and
• an acoustics configuration layer that includes a fingerprint sensing area that is greater than an area or dimension of the ultrasonic fingerprint sensor, wherein
• the acoustics configuration layer is formed from a resonating material, wherein
• a thickness of the resonating material is approximately 10% of the thickness of all layers of the flexible display, and wherein
• the fingerprint sensing area is expanded by the acoustics configuration layer to be greater than a physical area of an array of sensing elements of the ultrasonic fingerprint sensor.

A device comprising:

• a foldable display comprising a cover layer, an adhesive film layer, and a glass layer, wherein
• the adhesive film layer is situated between the cover layer and the glass layer;
• an ultrasonic fingerprint sensor;
• and
• an acoustics configuration layer formed of a resonating material, wherein
• the acoustics configuration layer includes a fingerprint sensing area that is greater than an area or dimension of the ultrasonic fingerprint sensor, wherein
• a thickness of the resonating material is approximately 10% of the thickness of all layers of the foldable display, and wherein
• the fingerprint sensing area is expanded by the acoustics configuration layer to be greater than a physical area of an array of sensing elements of the ultrasonic fingerprint sensor.

A device comprising:

• a foldable display;
• an ultrasonic fingerprint sensor, wherein
• the foldable display comprises a cover layer, an adhesive film layer, a glass layer, and one or more other layers, and wherein
• the adhesive film layer is situated between the cover layer and the glass layer;
• and
• an acoustics configuration layer, wherein
• the acoustics configuration layer includes a fingerprint sensing area that is greater than an area or dimension of the ultrasonic fingerprint sensor, wherein
• the fingerprint sensing area is expanded by the acoustics configuration layer to be greater than a physical area of an array of sensing elements of the ultrasonic fingerprint sensor, wherein
• the acoustics configuration layer is formed from a resonating material, and wherein
• a thickness of the resonating material is approximately 10% of the thickness of all layers of the foldable display.