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Fingerprint sensing device and fingerprint sensing touch device

A sensing device and fingerprint technology, which is applied in the fields of instruments, character and pattern recognition, computer parts, etc., can solve the problems of contact and image reorganization, speed of brushing, and limitation of pressure force, etc., to simplify the hardware circuit, Avoid the interference of external static electricity and the effect of mutual interference

Active Publication Date: 2010-06-09
ACER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this sensing method has limitations on the speed of brushing and the force of pressing, and it also needs to face problems such as non-uniform contact and image reconstruction.

Method used

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  • Fingerprint sensing device and fingerprint sensing touch device
  • Fingerprint sensing device and fingerprint sensing touch device
  • Fingerprint sensing device and fingerprint sensing touch device

Examples

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Embodiment Construction

[0024] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

[0025] figure 1 It is a block diagram of the first preferred embodiment of the capacitive fingerprint sensing device of the present invention, wherein the fingerprint sensing device 10 includes a sensing array 11, a driving circuit 12, a reading circuit 13, and a switching circuit 14 , a selection circuit 15 and a reset circuit 16 . The sensing array 11 includes a plurality of sensing units 110, which are arranged in a plurality of columns (rows) and a plurality of rows (columns) (horizontal columns, vertical rows, eight columns and six rows in the figure, but the number of columns and rows are different. up to this limit). The selection circuit 15 is coupled to the sensing array 11 by a plurality of control lines 17 , and each control line 17 is coupled to a row of sensing units. The switching circuit ...

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Abstract

The invention relates to a fingerprint sensing device and a related fingerprint sensing touch device, which are provided with specially designed sensing units capable of improving the accuracy of fingerprint sensing. The fingerprint sensing device comprises a plurality of sensing units, a driving circuit and a reading circuit, wherein each sensing unit comprises a fingerprint electrode and a storage capacitor, the storage capacitor is coupled with the fingerprint electrode, and induction capacitance formed between the fingerprint electrode and a finger is connected with the storage capacitor in parallel; the driving circuit is coupled with the sensing units and can provide charging signals for charging the equivalent capacitance of each sensing unit, wherein, the equivalent capacitance value of any sensing unit is determined according to whether the sensing unit forms the induction capacitance or not; and the reading circuit is coupled with the sensing units and can read the voltage value of the storage capacitor of the sensing units after the equivalent capacitance of any sensing unit is charged, thereby judging whether the fingerprint is sensed and whether the sensed fingerprint is a ridge or a valley.

Description

technical field [0001] The invention relates to fingerprint detection, in particular to a fingerprint detection device and a touch device with fingerprint detection. Background technique [0002] Fingerprint detection is currently the most widely used biometric technology. Since each person's fingerprint is different, it can be used to confirm the true identity of the subject. Fingerprint sensing has many excellent features in identifying an identity, so many products have integrated fingerprint sensing functions, such as notebook computers, mobile phones, and flash drives with fingerprint sensing functions. [0003] To effectively perform the fingerprint sensing function, the design of the fingerprint sensor (or fingerprint sensor) is very important. The sensing area of ​​a traditional fingerprint sensor is strip-shaped. When performing fingerprint sensing, you need to move your finger to scan (sweeping scanning), and then recombine the generated strip-shaped fingerprint ...

Claims

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Application Information

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IPC IPC(8): G06K9/00
Inventor 陈志强
Owner ACER INC
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