HYBRID CAPACITIVE AND ULTRASONIC SENSING
First Claim
1. A system comprising:
- a fingerprint sensor having one or more sensing electrodes; and
a controller configured to;
provide one or more first drive signals to the one or more sensing electrodes to configure the fingerprint sensor in a capacitive sensing mode, andprovide one or more second drive signals to the one or more sensing electrodes to configure the fingerprint sensor in an ultrasonic sensing mode, the one or more second drive signals different from the one or more first drive signals.
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Accused Products
Abstract
Systems, methods and apparatus for configuring a fingerprint sensor to operate in a capacitive sensing mode and an ultrasonic sensing mode are disclosed. A fingerprint sensor may be configured to operate in a capacitive sensing mode by driving a sensing electrode using a controller. In some implementations, an object positioned on or near the sensing electrode may be detected using the fingerprint sensor in the capacitive sensing mode, and the controller can drive electrodes of the fingerprint sensor differently to configure the fingerprint sensor to operate in an ultrasonic sensing mode. In some implementations, an applications processor may be instructed to authenticate a fingerprint of the object from image data obtained when the fingerprint sensor is operating in the ultrasonic sensing mode. In some implementations, a display of a mobile device containing the fingerprint sensor may be unlocked, or the mobile device may be woken up when the fingerprint is authenticated.
82 Citations
25 Claims
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1. A system comprising:
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a fingerprint sensor having one or more sensing electrodes; and a controller configured to; provide one or more first drive signals to the one or more sensing electrodes to configure the fingerprint sensor in a capacitive sensing mode, and provide one or more second drive signals to the one or more sensing electrodes to configure the fingerprint sensor in an ultrasonic sensing mode, the one or more second drive signals different from the one or more first drive signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for operating a fingerprint sensor, the method comprising:
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operating a fingerprint sensor in a capacitive sensing mode; determining, by the fingerprint sensor operating in a capacitive sensing mode, that an object has touched a sensing electrode; configuring, by the controller, the fingerprint sensor to function in an ultrasonic sensing mode; determining, using the fingerprint sensor in the ultrasonic sensing mode, that the object that has touched the sensing electrode is a finger; and instructing an applications processor to authenticate a fingerprint of the finger. - View Dependent Claims (19, 20, 21)
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22. A non-transitory computer readable medium storing instructions executable by one or more processors of a controller to cause a method to be performed for configuring a fingerprint sensor, the method comprising:
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configuring the fingerprint sensor to function in a capacitive sensing mode; determining that an object has touched a sensing electrode using the fingerprint sensor in the capacitive sensing mode; configuring the fingerprint sensor to function in an ultrasonic sensing mode; determining that the object that has touched the sensing electrode is a finger using the fingerprint sensor in the ultrasonic sensing mode; and instructing an applications processor to authenticate a fingerprint of the finger. - View Dependent Claims (23, 24, 25)
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Specification