FINGERPRINT RECOGNTION SENSOR AND TERMINAL DEVICE
First Claim
1. A fingerprint identification sensor, applicable to a terminal device, comprising:
- a sensor unit, comprising a capacitor array formed by a plurality of capacitor induction units, and having an output, a power supply and a sensor ground, the output outputting a driving signal; and
a modulation circuit, connected to a device ground of the terminal device, and the output, the power supply and the sensor ground of the sensor unit, and configured to, upon modulating the driving signal to a modulated signal, output the modulated signal to the sensor ground, wherein a voltage of the power supply varies with the modulated signal.
2 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is a fingerprint identification sensor, which comprises: a sensor unit, comprising a capacitor array formed by a plurality of capacitor induction units and having an output, a power supply and a sensor ground output; a conversion circuit, connected to the device ground of the terminal device, and the output and the sensor ground of the sensor unit, and configured to, upon modulating the driving signal to the modulated signal, output the modulated signal to the sensor ground; an energy storage capacitor, connected between the power supply and the sensor ground, and configured to stabilize an operating voltage of the sensor unit; a high-speed transistor switch, connected to the power supply, and configured to perform synchronous switch-on and switch-off according to status of the conversion circuit power supply; and a power supply, connected to the conversion circuit and the power supply of the sensor unit via the high-speed transistor switch.
12 Citations
20 Claims
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1. A fingerprint identification sensor, applicable to a terminal device, comprising:
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a sensor unit, comprising a capacitor array formed by a plurality of capacitor induction units, and having an output, a power supply and a sensor ground, the output outputting a driving signal; and a modulation circuit, connected to a device ground of the terminal device, and the output, the power supply and the sensor ground of the sensor unit, and configured to, upon modulating the driving signal to a modulated signal, output the modulated signal to the sensor ground, wherein a voltage of the power supply varies with the modulated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A terminal device, comprising a fingerprint identification sensor;
- wherein the fingerprint identification sensor comprises;
a sensor unit, comprising a capacitor array formed by a plurality of capacitor induction units, and having an output, a power supply and a sensor ground, the output outputting a driving signal; and a modulation circuit, connected to a device ground of the terminal device, and the output, the power supply and the sensor ground of the sensor unit, and configured to, upon modulating the driving signal to a modulated signal, output the modulated signal to the sensor ground, wherein a voltage of the power supply varies with the modulated signal; - View Dependent Claims (16, 17, 18, 19, 20)
- wherein the fingerprint identification sensor comprises;
Specification