Method of finger capacitance modeling based on Ansoft Maxwell

A technology of finger capacitance and fingers, which is applied in the field of finger capacitance modeling based on AnsoftMaxwell, can solve problems affecting circuit design, fingerprint recognition rate, and subsequent processing.

Inactive Publication Date: 2018-04-17
深圳市凤浴科技有限公司
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  • Abstract
  • Description
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Problems solved by technology

Because the relative permittivity of the passivation layer and the protective layer are different, there will be errors in the sensing capacitance value obtained simply by using the traditional method of testing capacitance and the parallel relationship of capacitance, which will affect the circuit design and have serious consequences for subsequent processing. Influence, especially the fingerprint recognition rate

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  • Method of finger capacitance modeling based on Ansoft Maxwell
  • Method of finger capacitance modeling based on Ansoft Maxwell
  • Method of finger capacitance modeling based on Ansoft Maxwell

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Embodiment Construction

[0051] In order to better understand the present invention, the present invention will be further described in detail below in conjunction with specific examples and with reference to the accompanying drawings.

[0052] attached figure 1 For the specific flowchart of the simulation analysis of the embodiment of the present invention, the present invention provides a kind of method based on the finger capacitance modeling of AnsoftMaxwell, comprises the following steps:

[0053] Step 1: According to the needs of circuit design, select the process library, and determine the structure, material, shape, etc. of the model. Figure 4 It is a schematic diagram of the cross-section of the finger capacitance model of the embodiment of the present invention. The finger capacitance model includes a dielectric layer 210 between finger valleys and ridges, a protective layer 220 , a passivation layer 230 and a sensing plate 240 . Among them, the distance between the finger valley and the...

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Abstract

The invention provides a method of finger capacitance modeling based on Ansoft Maxwell. A size of a fingerprint image collection unit is determined according to market demand; an Ansoft Maxwell platecapacitance model is established, and an Electrostatic solver is utilized to complete solving; after the model is perfected, corresponding element material attributes are assigned, boundary conditionsand excitation sources are added, and solving parameters are formulated according to needs; then solving specifications are set, and self-adaptive solving is carried out by a system; and finally, a solving result is displayed through a postprocessor. According to the method, Ansoft Maxwell finite-element simulation software is adopted to carry out electrostatic-field simulation calculation on themodel, and precise capacitance values of a matrix of any size under determined voltage, determined distance and different finger states can be obtained by utilizing a powerful postprocessing functionthereof.

Description

technical field [0001] The invention relates to the technical field of fingerprints, in particular to a method for modeling finger capacitance based on Ansoft Maxwell. Background technique [0002] The existing fingerprint image acquisition unit adopts the principle of capacitive induction type acquisition. The main mechanism is that when the finger is placed on the surface of the collector, it will generate a certain inductive capacitance with the sensing plate of the collector, which is called finger capacitance. . The size of the capacitance is related to the distance from the skin surface to the sensing plate. The distance between the valleys and ridges on the finger print and the collection capacitor plate is different, so the capacitance formed between the finger and the collection plate is different. By measuring the capacitance The size of the value can distinguish the valleys and ridges on the fingerprint, thus presenting a complete fingerprint graph. Therefore, d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 陈思宇
Owner 深圳市凤浴科技有限公司
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