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Fingerprint sensor and driving method thereof

A fingerprint sensor and sensing electrode technology, applied in the direction of acquiring/arranging fingerprints/palmprints, instruments, characters and pattern recognition, etc., can solve the problems of difficult manufacturing process, difficult mass production, high power consumption, etc. The effect of high difficulty, reduced power consumption, and simplified manufacturing process

Active Publication Date: 2017-12-19
MICROARRAY MICROELECTRONICS CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a fingerprint sensor and its driving method to reduce the difficulty of the existing manufacturing process of the fingerprint sensor, and solve the problems of the existing fingerprint sensor manufacturing process is difficult, the power consumption is large, and it is not easy to mass-produce

Method used

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  • Fingerprint sensor and driving method thereof
  • Fingerprint sensor and driving method thereof
  • Fingerprint sensor and driving method thereof

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

[0032] Figure 1a Shown is a schematic structural diagram of a fingerprint sensor provided by an embodiment of the present invention, see Figure 1a , the fingerprint sensor specifically includes:

[0033] chip 100;

[0034] The drive element 200 is used to emit an ultrasonic signal when turned on;

[0035] The piezoelectric element 300 is arranged on one side of the chip 100, and is used to convert the ultrasonic signal reflected by the target finger into an electric charge;

[0036] A plurality of pixel units ...

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Abstract

The invention discloses a fingerprint sensor and a driving method thereof. The fingerprint sensor comprises a chip, a driving element used for emitting ultrasonic signals during starting, a piezoelectric unit arranged on one face of the chip and used for converting the ultrasonic signals reflected by a target finger into electric charge quantity, multiple pixel units which are arranged in an array manner, and at least one signal detection circuit. Each pixel unit comprises a sensor electrode which is electrically connected with the piezoelectric element. Each signal detection circuit is electrically connected with a corresponding sensing electrode and is used for detecting the electric charge quantity on the sensing electrode, and outputting an electrical signal corresponding to the fingerprint information. Thus, simplification of manufacturing technique of the fingerprint sensor is achieved and an effect of power consumption reduction is achieved.

Description

technical field [0001] Embodiments of the present invention relate to fingerprint sensor technology, in particular to a fingerprint sensor and a driving method thereof. Background technique [0002] With the development of science and technology, the application of fingerprint sensor is more and more extensive. [0003] At present, the fingerprint recognition function has begun to be built into the bottom of the screen. The fingerprint sensor must reach the penetration of 400um chemically strengthened glass. Under this scale, the noise signal will cause relatively large interference to the image. Therefore, the signal penetration of the capacitive fingerprint sensor is limited by the screen glass. Thickness restrictions. The ultrasonic fingerprint sensor has a strong penetrating ability, and it is provided with an ultrasonic transmitting element and an ultrasonic receiving element, so that the location of the fingerprint ridge and the valley can be distinguished. Existing ...

Claims

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Application Information

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IPC IPC(8): G06K9/00
CPCG06V40/1306
Inventor 李扬渊
Owner MICROARRAY MICROELECTRONICS CORP LTD
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