A fingerprint sensor and its driving method
A fingerprint sensor and sensing electrode technology, which can be used in the acquisition/organization of fingerprints/palmprints, instruments, and print image acquisition, etc. , Simplify the production process, and solve the effect of difficult process
Active Publication Date: 2021-04-27
MICROARRAY MICROELECTRONICS CORP LTD
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[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
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[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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The invention discloses a fingerprint sensor and a driving method thereof. The fingerprint sensor includes: a chip; a driving element, which is used to emit an ultrasonic signal when it is turned on; a piezoelectric element, which is arranged on one side of the chip, and is used to convert the ultrasonic signal reflected by the target finger into an electric charge; arranged in an array A plurality of pixel units, the pixel unit includes a sensing electrode, each of the sensing electrodes is electrically connected to the piezoelectric element; at least one signal detection circuit, each of the signal detection circuits is connected to the corresponding sensor The sensing electrodes are electrically connected to detect the amount of charge on the sensing electrodes and output electrical signals corresponding to fingerprint information. Realize the effect of simplifying the manufacturing process of the fingerprint sensor and reducing the power consumption.
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 ...
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IPC IPC(8): G06K9/00
CPCG06V40/1306
Inventor 李扬渊
Owner MICROARRAY MICROELECTRONICS CORP LTD