Biometric sensing device with discrete ultrasonic transducers
First Claim
1. A biometric sensing system, comprising:
- discrete ultrasonic transducers, each discrete ultrasonic transducer comprising a piezoelectric material having a first surface and a second surface opposite the first surface;
a first electrode layer disposed over the first surface of the discrete ultrasonic transducers, wherein the first electrode layer comprises a plurality of discrete electrode members each spanning two or more discrete ultrasonic transducers;
a second electrode layer disposed over the second surface of the discrete ultrasonic transducers, wherein the second electrode layer comprises discrete electrode elements with each discrete electrode element disposed over one ultrasonic transducer;
high voltage drive circuitry operably connected to the first electrode layer; and
low voltage readout circuitry operably connected to the second electrode layer.
1 Assignment
0 Petitions
Accused Products
Abstract
A biometric sensing system includes discrete ultrasonic transducers, a first electrode layer disposed over a first surface of the discrete ultrasonic transducers, and a second electrode layer disposed over a second surface of the discrete ultrasonic transducers. The first electrode layer includes discrete electrode members. Each discrete electrode member spans two or more discrete ultrasonic transducers. The second electrode layer includes discrete electrode elements, with a discrete electrode element disposed over the second surface of one ultrasonic transducer. Drive circuitry is operably connected to the first electrode layer, and readout circuitry is operably connected to the second electrode layer.
145 Citations
20 Claims
-
1. A biometric sensing system, comprising:
-
discrete ultrasonic transducers, each discrete ultrasonic transducer comprising a piezoelectric material having a first surface and a second surface opposite the first surface; a first electrode layer disposed over the first surface of the discrete ultrasonic transducers, wherein the first electrode layer comprises a plurality of discrete electrode members each spanning two or more discrete ultrasonic transducers; a second electrode layer disposed over the second surface of the discrete ultrasonic transducers, wherein the second electrode layer comprises discrete electrode elements with each discrete electrode element disposed over one ultrasonic transducer; high voltage drive circuitry operably connected to the first electrode layer; and low voltage readout circuitry operably connected to the second electrode layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An electronic device, comprising:
-
a biometric sensing device comprising; discrete ultrasonic transducers, each discrete ultrasonic transducer comprising a piezoelectric material having a first surface and a second surface opposite the first surface; a first electrode layer disposed over the first surface of the discrete ultrasonic transducers, wherein the first electrode layer comprises discrete electrode members each spanning two or more discrete ultrasonic transducers; a second electrode layer disposed over the second surface of the discrete ultrasonic transducers, wherein the second electrode layer comprises discrete electrode elements with one discrete electrode element disposed over one ultrasonic transducer; an upper element that includes at least one layer of material disposed over the ultrasonic biometric sensing device, wherein an exterior surface of the upper element is an input surface for the biometric sensing device; high voltage drive circuitry operably connected to the first electrode layer; low voltage readout circuitry operably connected to the second electrode layer; and a processing channel operably connected to the low voltage readout circuitry;
whereineach discrete ultrasonic transducer electrically isolates the high voltage drive circuitry from the low voltage readout circuitry. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A method of operating a biometric sensing device that includes discrete ultrasonic transducers, a plurality of first discrete electrode members each disposed over a first surface of a piezoelectric substrate of the discrete ultrasonic transducers and spanning two or more discrete ultrasonic transducers, and a second discrete electrode member disposed over a second surface opposite the first surface of the piezoelectric substrate of each discrete ultrasonic transducer, the method comprising:
-
applying a drive signal pulse to the plurality of first discrete electrode members when an image of a biometric subject is to be captured, wherein each discrete ultrasonic transducer produces a sound wave pulse based on the drive signal pulse; using the second discrete electrode elements to read signals from the discrete ultrasonic transducers, wherein the signals are generated by the discrete ultrasonic transducers based on reflected portions of the sound wave pulses; and constructing a biometric image based on the signals read from the discrete ultrasonic transducers.
-
Specification