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Capacitive fingerprint sensor and panel thereof

A capacitive and sensor technology, applied in the field of capacitive fingerprint sensor and its panel, can solve the problem that the accuracy is not easy to obtain

Inactive Publication Date: 2011-05-04
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not easy to obtain the required accuracy as environmental factors such as noise or crosstalk can detract from the result

Method used

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  • Capacitive fingerprint sensor and panel thereof
  • Capacitive fingerprint sensor and panel thereof
  • Capacitive fingerprint sensor and panel thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] Figure 2 shows a specific embodiment of the panel of the present invention. The panel system includes an active matrix area 25 , a data driver 21 , a scan driver 22 , a readout circuit 23 and an image processing circuit 24 . The active matrix area 25 includes a capacitive fingerprint sensor and / or a plurality of image pixels. The capacitive fingerprint sensor has a plurality of capacitive fingerprint sensing units 31 , and each capacitive fingerprint sensing unit 31 can selectively coexist with an image pixel in a pixel unit. The data driver 21 is used to drive data. The scan driver 22 is used to control the scan lines connected to the capacitive fingerprint sensing unit 31 . Generally speaking, when the capacitive fingerprint sensing unit 31 is operated, the scanning lines connected to the capacitive fingerprint sensing unit 31 are activated during the whole operation process. The readout circuit 23 is used to receive the analog signal of the readout line of the cap...

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PUM

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Abstract

The invention provides a capacitive fingerprint sensor, which comprises a sensor unit and a control circuit. The sensor unit comprises a fingerprint capacitor, a first transistor and a second transistor. The capacitance of the fingerprint capacitor is a concave part capacitance CFV or a convex part capacitance CFR, wherein the CFV is less than the CFR. The first transistor is used for controlling the fingerprint capacitor in a scanning line period. The second transistor is used for discharging the fingerprint capacitor. The control circuit comprises an integrator and a third transistor. The integrator has a reference capacitor Cfb. The third transistor is used for precharging the fingerprint capacitor and redistributing charges between the fingerprint capacitor and the reference capacitor.

Description

technical field [0001] The invention relates to a capacitive fingerprint sensor and its panel, in particular to a capacitive fingerprint sensor using multiple transistors and its panel. Background technique [0002] A fingerprint sensor is a sensor used to identify fingerprint patterns and provide reliable personal identification. The fingerprint sensor is also widely used in portable products, such as mobile phones and notebook computers, to ensure the security of personal confidential data. [0003] Figures 1A and 1B show the equivalent circuit of a fingerprint sensor. In general, the fingerprint sensor can be implemented in a chip, and the number 13 in FIG. 1A represents a protective layer, which acts as a capacitor C d the dielectric layer. If the fingerprint sensor is embedded in an image panel, number 11 in FIG. 1A represents an ITO plate, and number 13 represents glass and films, such as color filters, polarizers, etc. The following description takes the fingerpri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
Inventor 庄凯岚陈英烈
Owner HIMAX TECH LTD