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Fingerprint acquisition circuit, chip and electronic equipment

A fingerprint collection and circuit technology, which is applied in print image collection, acquisition/organization of fingerprints/palmprints, instruments, etc., can solve the problems of low sensitivity, affecting the accuracy of fingerprint signals, and affecting the accuracy of sensing, so as to reduce parasitic The generation of capacitance and the effect of improving the detection accuracy

Pending Publication Date: 2021-06-25
FOCALTECH ELECTRONICS SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The structure of the previous fingerprint collection circuit is complicated, and it is easily interfered by external signals when collecting fingerprint signals, which affects the accuracy of sensing.
For example, in the fingerprint collection circuit, there is a parasitic capacitance between the metal layer that collects fingerprints and the substrate layer, which will affect the accuracy of fingerprint signal sensing by the fingerprint collection circuit.
In addition, when the existing fingerprint collection circuit uses a high-gain amplifier to amplify the fingerprint signal, the sensitivity is not high.

Method used

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  • Fingerprint acquisition circuit, chip and electronic equipment
  • Fingerprint acquisition circuit, chip and electronic equipment
  • Fingerprint acquisition circuit, chip and electronic equipment

Examples

Experimental program
Comparison scheme
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other Embodiment approach

[0055] In other embodiments, the feedback capacitor C of the amplifier 131 in this application FB Diversified settings can be applied to the application of different external conditions.

other Embodiment approach

[0056] In other embodiments, after the pixel array sensing circuit 12 of the fingerprint collection circuit 1 performs one fingerprint sampling, the analog-to-digital conversion circuit 15 performs multiple analog-to-digital conversions; or after the pixel array sensing circuit 12 performs multiple fingerprint sampling, the modulus The conversion circuit 15 performs one analog-to-digital conversion; or after the pixel array sensing circuit 12 performs multiple fingerprint samplings, the analog-to-digital conversion circuit 15 performs multiple analog-to-digital conversions and other different working modes to effectively increase the signal volume of the fingerprint.

[0057] The embodiment of the present application also provides a fingerprint chip, and the fingerprint chip includes a fingerprint collection circuit 1 . The fingerprint collection circuit 1 is provided as in the above-mentioned embodiment. As for the specific content of the fingerprint collection circuit, refer...

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PUM

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Abstract

The invention relates to a fingerprint acquisition circuit, a chip and electronic equipment. The fingerprint acquisition circuit comprises a pixel array sensing circuit and an amplifying circuit. The pixel array sensing circuit comprises a plurality of pixel circuits, and each pixel circuit comprises a first metal layer, a second metal layer, a third metal layer and a substrate layer. The first metal layer is used for detecting fingerprints, the second metal layer and the third metal layer are arranged between the first metal layer and the substrate layer, and the projection of the second metal layer and the projection of the third metal layer on the substrate layer cover the projection of the first metal layer on the substrate layer, so that the first metal layer is isolated from the substrate layer. The first metal layer generates a fingerprint signal after being touched by a finger, and the amplifying circuit amplifies the fingerprint signal. The second metal layer and the third metal layer are arranged between the first metal layer and the substrate layer to isolate the first metal layer from the substrate layer, so that parasitic capacitance of the first metal layer and the substrate layer is reduced, and the detection accuracy of fingerprint signals is improved.

Description

technical field [0001] The present application relates to the technical field of wireless communication, in particular to a fingerprint collection circuit, a chip and an electronic device with a fingerprint collection chip. Background technique [0002] The structure of the previous fingerprint collection circuit is complicated, and it is easily interfered by external signals when collecting fingerprint signals, which affects the accuracy of sensing. For example, there is a parasitic capacitance between the metal layer for collecting fingerprints and the substrate layer in the fingerprint collection circuit, which will affect the accuracy of the fingerprint signal sensing by the fingerprint collection circuit. In addition, when the existing fingerprint collection circuit uses a high-gain amplifier to amplify the fingerprint signal, the sensitivity is not high. Contents of the invention [0003] In view of this, a fingerprint collection circuit and electronic equipment are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06V40/1306
Inventor 孙天奇蒋新喜程珍娟张靖恺
Owner FOCALTECH ELECTRONICS SHENZHEN CO LTD