Fingerprint detection device and method and associated touch control device with fingerprint detection
First Claim
1. A fingerprint detection device comprising:
- a plurality of detecting units, each of which comprises a fingerprint electrode and a storage capacitor coupled to the fingerprint electrode, wherein a sense capacitor formed between the fingerprint electrode and a finger is parallel connected to the storage capacitor;
a driving circuit, coupled to the detecting units, for providing a charging signal to charge an equivalent capacitor within each of the detecting units, wherein a capacitance of the equivalent capacitor is determined according to whether the sense capacitor is formed within the detecting unit; and
a reading circuit, coupled to the detecting units, for reading a voltage of the storage capacitor of each of the detecting units after the equivalent capacitor is charged.
1 Assignment
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Accused Products
Abstract
A fingerprint detection device and method and an associated touch control device with fingerprint detection are disclosed. The fingerprint detection device includes special detecting units for upgrading the accuracy of fingerprint detection. The fingerprint detection device comprises a plurality of detecting units, a driving circuit and a reading circuit. Each detecting unit includes a fingerprint electrode and a storage capacitor coupled to the fingerprint electrode. A sense capacitor can be formed between the fingerprint electrode and a finger, where the sense capacitor is parallel connected to the storage capacitor. The driving circuit is coupled to the detecting units and provides a charging signal to charge an equivalent capacitor of each detecting unit, where the capacitance of the equivalent capacitor is determined according to whether the sense capacitor is formed within the detecting unit. The reading circuit is coupled to the detecting units and reads the voltage of the storage capacitor after the equivalent capacitor is charged, so as to determine whether the detecting unit detects a portion of fingerprint and the detected portion is a furrow or ridge.
33 Citations
30 Claims
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1. A fingerprint detection device comprising:
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a plurality of detecting units, each of which comprises a fingerprint electrode and a storage capacitor coupled to the fingerprint electrode, wherein a sense capacitor formed between the fingerprint electrode and a finger is parallel connected to the storage capacitor; a driving circuit, coupled to the detecting units, for providing a charging signal to charge an equivalent capacitor within each of the detecting units, wherein a capacitance of the equivalent capacitor is determined according to whether the sense capacitor is formed within the detecting unit; and a reading circuit, coupled to the detecting units, for reading a voltage of the storage capacitor of each of the detecting units after the equivalent capacitor is charged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A touch control device with fingerprint detection comprising:
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a plurality of detecting units, each of which comprises a fingerprint electrode and a storage capacitor coupled to the fingerprint electrode, wherein a sense capacitor formed between the fingerprint electrode and a finger is parallel connected to the storage capacitor; a driving circuit, coupled to the detecting units, for providing a charging signal to charge an equivalent capacitor within each of the detecting units, wherein a capacitance of the equivalent capacitor is determined according to whether the sense capacitor is formed within the detecting unit; and a reading circuit, coupled to the detecting units, for reading a voltage of the storage capacitor of each of the detecting units after the equivalent capacitor is charged; wherein the detecting units are configured as a fingerprint detecting area and a touch control area, and a density of detecting unit of the fingerprint detecting area is larger than that of the touch control area. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A fingerprint detection method comprising steps of:
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providing a plurality of detecting units, each of which comprises a fingerprint electrode and a storage capacitor coupled to the fingerprint electrode, wherein a sense capacitor formed between the fingerprint electrode and a finger is parallel connected to the storage capacitor; providing a charging signal to charge an equivalent capacitor within each of the detecting units, wherein a capacitance of the equivalent capacitor is determined according to whether the sense capacitor is formed within the detecting unit; and reading a voltage of the storage capacitor of each of the detecting units after the equivalent capacitor is charged. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification