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Capacitive fingerprint sensor, fingerprint sensing device and identification control method thereof

A fingerprint sensor, capacitive technology, applied in the direction of acquiring/organizing fingerprints/palmprints, character and pattern recognition, instruments, etc., can solve the problems of low yield rate, inaccurate sensing capacitance information, high manufacturing cost, etc., and achieve accurate sensing vertical Directional capacitance, solving the effect of inaccurate information and avoiding signal aliasing

Active Publication Date: 2020-08-28
SHENZHEN FLYING FAIRY INTELLIGENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a capacitive fingerprint sensor, a fingerprint sensing device and an identification control method, aiming to solve the problem of inaccurate sensing capacitance information and low fingerprint resolution when the thickness of the medium layer increases in the existing capacitive fingerprint sensor. Unable to complete fingerprint verification accurately, limited production raw materials, high manufacturing cost, unfavorable for mass production and low yield rate

Method used

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  • Capacitive fingerprint sensor, fingerprint sensing device and identification control method thereof
  • Capacitive fingerprint sensor, fingerprint sensing device and identification control method thereof
  • Capacitive fingerprint sensor, fingerprint sensing device and identification control method thereof

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Embodiment 1

[0065] figure 2 shows the correspondence provided by the first embodiment of the present invention figure 1 The sectional structure of the capacitive fingerprint sensor shown, for the convenience of explanation, only shows the part related to the first embodiment of the present invention, which is described in detail as follows:

[0066] Further, such as figure 2 shown in figure 1 On the basis of , in order to be able to cooperate with the generation of independent sensing capacitance, the capacitive fingerprint sensor also includes a patterned conductor covering layer 9, and the patterned conductor covering layer 9 covers the surface of the dielectric layer 2 according to a preset rule; the patterned conductor covering layer 9 It is used for patterning and separating fingerprints according to preset rules when the human epidermal tissue 1 is in contact with it.

[0067] In the embodiment of the present invention, the preset rule specifically means that the patterned cond...

Embodiment 2

[0095] Figure 4 shows the correspondence provided by the second embodiment of the present invention figure 2 The shown cross-sectional structure of the capacitive fingerprint sensor, for ease of explanation, only shows the part related to the second embodiment of the present invention, and is described in detail as follows:

[0096] Further, such as Figure 4 shown in figure 2 and image 3 In order to further improve the resolution and clarity of the sensed fingerprint image, the area of ​​each sensing plate 6011 of the capacitive sensing conductor layer 6 can be enlarged to figure 2 The area of ​​the sensing plate 6011 in the first embodiment shown is 4 times, correspondingly, the sensing unit corresponding to the sensing plate 6011, the patterned conductor layer 4 corresponding to the sensing unit, the isolation layer corresponding to the sensing unit, and the patterned conductor layer 4, the corresponding dielectric layer 2 and the patterned conductor covering layer...

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Abstract

The invention belongs to the technical field of fingerprint sensing, and provides a capacitive fingerprint sensor, a fingerprint sensing device and an identification control method thereof. The sensor includes a substrate, a dielectric layer, a patterned conductor layer, a capacitive sensing conductor layer, a readout circuit and a processing control unit. In the present invention, the internal electric field channel with the first dielectric constant and the second dielectric constant formed by the dielectric layer and the electrostatic lens constructed by the patterned conductor layer according to the preset voltage can realize the change of the electric field focus, so as to realize accurate induction The vertical direction capacitance realizes the accuracy of the sensed capacitance from the most original sensing transition point of the sensing, avoids signal aliasing of the source sensing parameters, and fundamentally solves the inaccurate information of the existing sensing capacitance, low fingerprint resolution, and fingerprint information. Insufficient to complete the fingerprint verification accurately.

Description

technical field [0001] The invention belongs to the technical field of fingerprint sensing, and in particular relates to a capacitive fingerprint sensor, a fingerprint sensing device and an identification control method thereof. Background technique [0002] In the information age, existing consumer electronic devices often use fingerprint recognition systems to securely carry or obtain users' individual body information. One of the fingerprint identification systems that has been widely used is the capacitive fingerprint identification system. [0003] The capacitive fingerprint identification system essentially forms a potential difference between the sensing plate on the sensor and the fingerprint, generates an electric field capable of inductive capacitance through a sufficient potential difference, and then uses the inductive capacitance and the circuit system to quantify, and the quantified The results are presented in a matrix or 3D, so as to distinguish the ridges a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
CPCG06V40/1306G06V40/1365
Inventor 朱奇良简卫张欣
Owner SHENZHEN FLYING FAIRY INTELLIGENT TECH CO LTD
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