WO2018132993A1 - 一种指纹识别装置 - Google Patents

一种指纹识别装置 Download PDF

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Publication number
WO2018132993A1
WO2018132993A1 PCT/CN2017/071652 CN2017071652W WO2018132993A1 WO 2018132993 A1 WO2018132993 A1 WO 2018132993A1 CN 2017071652 W CN2017071652 W CN 2017071652W WO 2018132993 A1 WO2018132993 A1 WO 2018132993A1
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WO
WIPO (PCT)
Prior art keywords
layer
fingerprint recognition
coating
recognition device
fingerprint
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PCT/CN2017/071652
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English (en)
French (fr)
Inventor
龚才
侯侣
龙卫
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深圳市汇顶科技股份有限公司
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to EP17758789.6A priority Critical patent/EP3370187A4/en
Priority to KR1020177024795A priority patent/KR20180100277A/ko
Priority to CN201780000675.8A priority patent/CN107636687B/zh
Priority to PCT/CN2017/071652 priority patent/WO2018132993A1/zh
Priority to US15/697,763 priority patent/US10372959B2/en
Publication of WO2018132993A1 publication Critical patent/WO2018132993A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1329—Protecting the fingerprint sensor against damage caused by the finger
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/147—Details of sensors, e.g. sensor lenses
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/17—Image acquisition using hand-held instruments
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1347—Preprocessing; Feature extraction
    • G06V40/1359—Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1365—Matching; Classification
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1365—Matching; Classification
    • G06V40/1376—Matching features related to ridge properties or fingerprint texture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/02—Containers; Seals
    • H01L23/06—Containers; Seals characterised by the material of the container or its electrical properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/02—Containers; Seals
    • H01L23/10—Containers; Seals characterised by the material or arrangement of seals between parts, e.g. between cap and base of the container or between leads and walls of the container

Definitions

  • the present invention relates to the field of biometrics, and in particular, to a fingerprint identification device.
  • fingerprint recognition technology has become the standard for most smartphones.
  • the process of fingerprint recognition is divided into: firstly, the original fingerprint image is acquired by the fingerprint recognition module, and then the original fingerprint image and the registered fingerprint template are matched with the feature points, and after the matching is successful, the operation of unlocking or executing the instruction is performed.
  • the fingerprint recognition device on the market has poor hydrophobic and oleophobic performance.
  • the fingerprint recognition effect is affected by factors such as wet, sweat or oil on the finger (hereinafter referred to as wet finger), so that the fingerprint identification device is wet.
  • Fingerprint recognition accuracy and fingerprint recognition speed are reduced in the use environment such as fingers, and even unrecognized situations occur.
  • Figure 1 is a schematic diagram of the fingerprint detection method of the existing fingerprint recognition device for dry fingers.
  • Figure 2 is a schematic diagram of the fingerprint detection method of the existing fingerprint recognition device for wet fingers.
  • the sensing chip of the fingerprint identification device is composed of a matrix electrode plate, and a capacitance is formed between the electrode plate and the hand fingerprint path, and the capacitances of the different protrusions on the finger and the groove at the groove are different in capacitance CV and CR, and the capacitance is detected by detecting each capacitance. The size of the restored fingerprint image.
  • the depression of the fingerprint is filled with water, sweat or oil on the finger, and the water, sweat or oil on the wet finger spreads on the surface of the coating due to the angle of the water drop/sweat angle.
  • the contact area of water, sweat or oil on the surface of the coating is relatively large, and the affected sensing area is large, so that the fingerprint image cannot be clearly restored or cannot be restored at all, affecting the fingerprint recognition accuracy of wet fingers and the speed of fingerprint recognition. .
  • the embodiment of the invention provides a fingerprint identification device, which aims to solve the technical problem that the existing fingerprint identification device has poor hydrophobic and oleophobic performance, low fingerprint recognition accuracy for wet fingers and low fingerprint recognition speed.
  • the technical solutions adopted by the embodiments of the present invention include:
  • a fingerprint identification device includes a substrate, a sensing chip, a first covering layer and a second covering layer; the sensing chip is disposed on the substrate, the first covering layer covers the upper surface of the sensing chip, and the second covering layer Coating on the upper surface of the first cover layer; the second cover layer is a hydrophobic oleophobic coating.
  • the technical solution adopted by the embodiment of the invention further includes: the material used in the second covering layer is a polymer fluoropolymer.
  • the technical solution adopted by the embodiment of the present invention further includes: preparing the second cover layer by mixing the polymer fluoropolymer stock solution and the dipropylene glycol methyl ether solvent in proportion, uniformly spraying or vapor-depositing on the first The upper surface of the layer is covered and allowed to cure sufficiently to form a second cover layer.
  • the technical solution adopted by the embodiment of the invention further comprises: mixing ratio of the polymer fluoropolymer stock solution and the dipropylene glycol methyl ether solvent is 0.5-5:100.
  • the technical solution adopted by the embodiment of the present invention further includes: the thickness of the second covering layer is several nanometers to several tens of nanometers.
  • the technical solution adopted by the embodiment of the invention further includes that the first cover layer comprises a surface hardened layer or a cover plate.
  • the technical solution adopted by the embodiment of the present invention further includes: when the first covering layer is a surface hardening layer, a hydrophobic oleophobic material is added to the coating material of the surface hardened layer.
  • the technical solution adopted by the embodiment of the present invention further includes: when the first covering layer is a surface hardening layer, the hydrophobic oleophobic material added in the coating of the surface hardening layer comprises a silicone modified resin or an organic fluorine modified Resin.
  • the technical solution adopted by the embodiment of the present invention further includes: when the first covering layer is a surface hardening layer, the first covering layer is formed by: the hydrophobic oleophobic material and the polymerization inhibitor p-hydroxybenzoic acid The ether is mixed in proportion to the coating of the surface hardened layer, and the mixed coating is applied over the induction chip and sufficiently cured to form a first cover layer.
  • the technical solution adopted by the embodiment of the present invention further includes: mixing ratio of the hydrophobic oleophobic material and the polymerization inhibitor p-hydroxyanisole to the surface hardening layer coating is 1 to 5:20:100.
  • the technical solution adopted by the embodiment of the invention further includes a molding material, and the sensing chip is encapsulated on the substrate by a molding material.
  • the beneficial effect of the embodiment of the present invention is that the fingerprint identification device of the embodiment of the invention adds a hydrophobic oleophobic coating on the surface of the fingerprint identification device or a hydrophobic oleophobic material in the coating of the surface hardened layer.
  • the density of the hydrophobic component on the surface of the fingerprint recognition device is increased, thereby enhancing the hydrophobic and oleophobic performance of the surface of the fingerprint recognition device, and improving the fingerprint recognition accuracy and the fingerprint recognition speed under the wet finger use environment.
  • FIG. 1 is a schematic diagram showing the principle of fingerprint detection of a dry finger by a conventional fingerprint recognition device
  • FIG. 2 is a schematic diagram showing the principle of fingerprint detection of a wet finger by a conventional fingerprint recognition device
  • FIG. 3 is a schematic diagram of a water drop angle/sweat drop angle of a conventional fingerprint recognition device for fingerprint detection of a wet finger;
  • FIG. 4 is a schematic structural diagram of a fingerprint identification device according to a first embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a fingerprint identification apparatus according to a second embodiment of the present invention.
  • Figure 6 is a schematic view of the reaction of the organofluorine-modified acrylate and the surface hardened layer coating
  • Figure 7 is a schematic view of the reaction of an organic fluorine-modified acrylate with a surface hardened layer coating
  • FIG. 8 is a schematic diagram of a water drop angle/sweat drop angle of a fingerprint recognition device for fingerprint detection of a wet finger according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a fingerprint identification apparatus according to a first embodiment of the present invention.
  • the fingerprint identification device of the first embodiment of the present invention comprises a substrate 1, an inductive chip 2, a molding material 3, a first covering layer 4 and a second covering layer 5; the sensing chip 2 is encapsulated on the substrate 1 by a molding material 3, and the first covering
  • the layer 4 covers the upper side of the sensor chip 2, and the second cover layer 5 is applied to the upper surface of the first cover layer 4.
  • the second cover layer 5 is a hydrophobic oleophobic coating.
  • the first cover layer 4 may be a surface hardened layer or a cover plate; that is, the present invention can be applied to both a coated fingerprint recognition device and a cover plate of glass, ceramic, sapphire or other materials. Fingerprint identification device.
  • the material used for the second cover layer 5 is a polymer fluoropolymer such as perfluoropolyether or other modification having a -CF2-OC-F2-perfluoropolyether main chain structure. Perfluoropolyether.
  • the second cover layer 5 is applied by mixing the perfluoropolyether stock solution and the dipropylene glycol methyl ether solvent in a certain ratio, uniformly spraying or vapor-depositing on the upper surface of the first cover layer 4, and It is allowed to stand for a period of time to fully cure, thereby forming a second cover layer; the second cover layer 5 increases the hydrophobic and oleophobic capacity of the surface of the fingerprint recognition device, and improves the fingerprint recognition accuracy and the fingerprint recognition speed under the wet finger use environment.
  • the mixing ratio of the perfluoropolyether stock solution to the dipropylene glycol methyl ether solvent is 0.5 to 5:100, and the thickness of the second covering layer 5 is between several nanometers and several tens of nanometers, which does not affect The penetration of the sensor chip.
  • FIG. 5 is a schematic structural diagram of a fingerprint identification apparatus according to a second embodiment of the present invention.
  • the fingerprint identification device of the second embodiment of the present invention comprises a substrate 1, an inductive chip 2, a molding material 3 and a first covering layer 4; the sensing chip 2 is encapsulated on the substrate 1 by a molding material 3, and the first covering layer 4 covers the sensing chip.
  • the first cover layer 4 is a surface hardened layer to which a hydrophobic oleophobic material is added.
  • the hydrophobic oleophobic material added to the surface hardened layer includes a silicone modified resin, an organic fluorine modified resin or other fluorine modified with a coating system of the existing surface hardened layer.
  • the organic fluorine-modified acrylate is used as the hydrophobic oleophobic material.
  • the first coating layer 4 is prepared by uniformly mixing the organic fluorine-modified acrylate and the polymerization inhibitor p-hydroxyanisole to a certain ratio. In the preparation of the surface hardened layer, the mixed coating is applied over the sensing chip 2, and then allowed to stand for a period of time to sufficiently cure the mixed coating to form a first covering layer.
  • the mixing ratio of the organic fluorine-modified acrylate and the polymerization inhibitor p-hydroxyanisole to the surface hard coat layer is from 1 to 5:20:100.
  • FIG. 6 is a schematic diagram of the reaction between the organic fluorine-modified acrylate and the surface hardened layer coating
  • FIG. 7 is a schematic diagram of the reaction between the organic fluorine-modified acrylate and the surface hardened layer coating.
  • the hydrophilic end of the organic fluorine-modified acrylate is molecularly bonded to the molecules in the surface hardened coating to be fixed, and the hydrophobic end modified by fluorine is repelled to exhibit a surface.
  • the directionality increases the density of the hydrophobic component of the surface of the first cover layer, thereby improving the hydrophobic oleophobic property of the first cover layer.
  • the fingerprint recognition device is improved while the thickness of the surface hardened layer is not changed, and the penetration of the sensing chip is prevented from being affected.
  • the fingerprint detecting device of the embodiment of the invention has the principle of fingerprint detection for wet fingers: when the wet finger presses the surface of the fingerprint recognition device, the depression of the fingerprint is filled with water, sweat or oil on the finger, water and sweat on the wet finger. Or the oil stain will spread on the surface of the fingerprint identification device. Since the water drop angle/sweat angle is large, the contact area of the water, sweat or oil stain with the surface of the fingerprint identification device is relatively small, and the affected sensing area becomes smaller, so that the fingerprint image is made. More clear and fast restoration and recognition, which improves wet finger fingerprint recognition accuracy and fingerprint recognition speed.
  • FIG. 8 it is a schematic diagram of a water drop angle/sweat drop angle of a fingerprint recognition device for fingerprint detection of a wet finger according to an embodiment of the present invention.
  • the fingerprint identification device of the embodiment of the invention increases the density of the hydrophobic component on the surface of the fingerprint identification device by adding a hydrophobic oleophobic coating on the surface of the fingerprint identification device or adding a hydrophobic oleophobic material to the coating of the surface hardening layer, thereby enhancing the fingerprint
  • the hydrophobic oleophobic performance of the surface of the device is recognized, and the fingerprint recognition accuracy and the fingerprint recognition speed under the wet finger use environment are improved. At the same time, it is beneficial to improve the anti-wear performance of the surface of the fingerprint identification device.

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Abstract

一种指纹识别装置包括基板（1）、感应芯片（2）、第一覆盖层（4）和第二覆盖层（5）；所述感应芯片（2）设于基板（1）上，所述第一覆盖层（4）覆盖于感应芯片（2）的上方，所述第二覆盖层（5）涂布于第一覆盖层（4）的上表面；所述第二覆盖层（5）为疏水疏油涂层。本指纹识别装置通过在指纹识别装置表面增加疏水疏油涂层，使得指纹识别装置表面的疏水成分密度增大，从而增强指纹识别装置表面的疏水疏油性能，提高湿手指使用环境下的指纹识别准确性和指纹识别速度。

Description

一种指纹识别装置 【技术领域】
本发明涉及生物识别技术领域，尤其涉及一种指纹识别装置。
【背景技术】
随着技术的发展，指纹识别技术已经成为绝大部分智能手机的标配。指纹识别的过程分为：首先通过指纹识别模组获取原始指纹图像，然后原始指纹图像与注册指纹模板进行特征点匹配，在匹配成功之后进行解锁或执行指令等操作。
目前，市面上指纹识别装置由于其疏水疏油性能较差，在使用过程中会因手指上的湿、汗或油污(以下简称湿手指)等因素而影响指纹识别效果，使指纹识别装置在湿手指等使用环境下指纹识别准确性和指纹识别速度下降，甚至出现无法识别的情况。
指纹检测原理如图1至图3所示，图1为现有指纹识别装置对于干手指的指纹检测原理示意图，图2为现有指纹识别装置对于湿手指的指纹检测原理示意图，图3为现有指纹识别装置对于湿手指的指纹检测的水滴角/汗滴角示意图。指纹识别装置的感应芯片由矩阵式电极板组成，电极板与手指纹路之间形成电容，手指上不同的凸起处纹路与凹陷处纹路对电极板的电容CV和CR大小不同，通过检测各电容的大小还原指纹图像。但当湿手指按压涂层表面时，指纹的凹陷处被手指上的水、汗液或者油污填充，湿手指上的水、汗液或者油污会在涂层表面铺展开，因水滴角/汗滴角较小，所以水、汗液或者油污跟涂层表面的接触面积相对较大，受影响的感应区域较大，使得指纹图像不能清晰还原或根本不能还原，影响湿手指的指纹识别准确性及指纹识别速度。
【发明内容】
本发明实施例提供了一种指纹识别装置，旨在解决现有的指纹识别装置疏水疏油性能较差，对于湿手指的指纹识别准确性不高以及指纹识别速度低的技术问题。
为了解决以上提出的问题，本发明实施例采用的技术方案包括：
一种指纹识别装置，包括基板、感应芯片、第一覆盖层和第二覆盖层；所述感应芯片设于基板上，所述第一覆盖层覆盖于感应芯片的上方，所述第二覆盖层涂布于第一覆盖层的上表面；所述第二覆盖层为疏水疏油涂层。
本发明实施例采取的技术方案还包括：所述第二覆盖层所使用的材料为高分子含氟聚合物。
本发明实施例采取的技术方案还包括：所述第二覆盖层的制作方式为：将所述高分子含氟聚合物原液与二丙二醇甲醚溶剂按比例混合后均匀喷涂或蒸镀于第一覆盖层的上表面并使其充分固化，形成第二覆盖层。
本发明实施例采取的技术方案还包括：所述高分子含氟聚合物原液与二丙二醇甲醚溶剂的混合比例为0.5～5:100。
本发明实施例采取的技术方案还包括：所述第二覆盖层的厚度为几纳米至几十纳米。
本发明实施例采取的技术方案还包括：所述第一覆盖层包括表面硬化层或盖板。
本发明实施例采取的技术方案还包括：当所述第一覆盖层为表面硬化层时，所述表面硬化层的的制作涂料中添加有疏水疏油材料。
本发明实施例采取的技术方案还包括：当所述第一覆盖层为表面硬化层时，所述表面硬化层的的制作涂料中添加的疏水疏油材料包括有机硅改性树脂或有机氟改性树脂。
本发明实施例采取的技术方案还包括：当所述第一覆盖层为表面硬化层时，所述第一覆盖层的制作方式为：将所述疏水疏油材料与阻聚剂对羟基苯甲醚按比例混合到表面硬化层的制作涂料中，将混合后的涂料涂布在所述感应芯片的上方并使其充分固化，形成第一覆盖层。
本发明实施例采取的技术方案还包括：所述疏水疏油材料、阻聚剂对羟基苯甲醚与表面硬化层涂料的混合比例为1～5：20：100。
本发明实施例采取的技术方案还包括塑封材料，所述感应芯片通过塑封材料封装于基板上。
与现有技术相比，本发明实施例的有益效果在于：本发明实施例的指纹识别装置通过在指纹识别装置表面增加疏水疏油涂层或在表面硬化层的制作涂料中添加疏水疏油材料，使得指纹识别装置表面的疏水成分密度增大，从而增强指纹识别装置表面的疏水疏油性能，提高湿手指使用环境下的指纹识别准确性和指纹识别速度。
【附图说明】
图1为现有指纹识别装置对于干手指的指纹检测原理示意图；
图2为现有指纹识别装置对于湿手指的指纹检测原理示意图；
图3为现有指纹识别装置对于湿手指的指纹检测的水滴角/汗滴角示意图；
图4是本发明第一实施例的指纹识别装置的结构示意图；
图5是本发明第二实施例的指纹识别装置的结构示意图；
图6为有机氟改性丙烯酸酯与表面硬化层涂料反应前示意图；
图7为有机氟改性丙烯酸酯与表面硬化层涂料反应后示意图；
图8是本发明实施例的指纹识别装置对于湿手指的指纹检测的水滴角/汗滴角示意图。
【具体实施方式】
为了便于理解本发明，下面将参照相关附图对本发明进行更全面的描述。附图中给出了本发明的较佳实施例。但是，本发明可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本发明的公开内容的理解更加透彻全面。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本发明。
请参阅图4，是本发明第一实施例的指纹识别装置的结构示意图。本发明第一实施例的指纹识别装置包括基板1、感应芯片2、塑封材料3、第一覆盖层4和第二覆盖层5；感应芯片2通过塑封材料3封装于基板1上，第一覆盖层4覆盖于感应芯片2的上方，第二覆盖层5涂布于第一覆盖层4的上表面。其中，第二覆盖层5为疏水疏油涂层。
在本发明第一实施例中，第一覆盖层4可为表面硬化层或盖板；即，本发明可同时适用于涂布式指纹识别装置和玻璃、陶瓷、蓝宝石或其它材料的盖板式指纹识别装置。
在本发明第一实施例中，第二覆盖层5所使用的材料为高分子含氟聚合物，如全氟聚醚或具有-CF2-O-C-F2-全氟聚醚主链结构的其他改性全氟聚醚。以全 氟聚醚为例，第二覆盖层5的涂布方式为：将全氟聚醚原液与二丙二醇甲醚溶剂按一定比例混合后均匀喷涂或蒸镀于第一覆盖层4的上表面，并静置一段时间使其充分固化，从而形成第二覆盖层；通过第二覆盖层5增加指纹识别装置表面的疏水疏油能力，提高湿手指使用环境下的指纹识别准确性和指纹识别速度。
在本发明第一实施例中，全氟聚醚原液与二丙二醇甲醚溶剂的混合比例为0.5～5:100，第二覆盖层5的厚度为几纳米至几十纳米之间，不会影响感应芯片的穿透性。
请参阅图5，是本发明第二实施例的指纹识别装置的结构示意图。本发明第二实施例的指纹识别装置包括基板1、感应芯片2、塑封材料3和第一覆盖层4；感应芯片2通过塑封材料3封装于基板1上，第一覆盖层4覆盖于感应芯片2的上方。其中，第一覆盖层4为添加有疏水疏油材料的表面硬化层。
在本发明第二实施例中，表面硬化层中添加的疏水疏油材料包括有机硅改性树脂、有机氟改性树脂或与现有表面硬化层的涂料体系相容性较好的其他氟改性树脂；以有机氟改性丙烯酸酯作为疏水疏油材料为例，第一覆盖层4的制作方式为：将有机氟改性丙烯酸酯与阻聚剂对羟基苯甲醚按一定比例均匀混合到表面硬化层的制作涂料中，并将混合后的涂料涂布在感应芯片2的上方，然后静置一段时间使混合涂料充分固化，从而形成第一覆盖层。
在本发明第二实施例中，有机氟改性丙烯酸酯、阻聚剂对羟基苯甲醚与表面硬化层涂料的混合比例为1～5：20：100。
请一并参阅图6和图7，图6为有机氟改性丙烯酸酯与表面硬化层涂料反应前示意图，图7为有机氟改性丙烯酸酯与表面硬化层涂料反应后示意图。在混合涂料固化过程中，有机氟改性丙烯酸酯中的亲水端与表面硬化层涂料中的分子发生分子键结合而被固定下来，而被氟改性后的疏水端被排斥，表现出表面定向性，使得第一覆盖层表面的疏水成分密度增大，从而提高第一覆盖层的疏水疏油性能。同时，由于有机氟改性丙烯酸酯中的亲水端与表面硬化层涂料中 的分子发生分子键结合，结合非常牢固，抗磨损性能很好，保证在长期使用湿手指后指纹识别装置的指纹识别准确率和速度仍然很高。
在本发明第二实施例中，通过在表面硬化层的制作涂料中添加疏水疏油材料，提高指纹识别装置的同时，不会改变表面硬化层的厚度，避免影响感应芯片的穿透性。
本发明实施例的指纹识别装置对于湿手指的指纹检测原理为：当湿手指按压指纹识别装置表面时，指纹的凹陷处被手指上的水、汗液或者油污等填充，湿手指上的水、汗液或者油污会在指纹识别装置表面铺展开，由于水滴角/汗滴角较大，因此水、汗液或者油污跟指纹识别装置表面的接触面积相对较小，受影响的感应区域变小，使得指纹图像能更为清晰和快速的还原和识别，从而提高湿手指指纹识别准确性和指纹识别速度。具体如图8所示，是本发明实施例的指纹识别装置对于湿手指的指纹检测的水滴角/汗滴角示意图。
本发明实施例的指纹识别装置通过在指纹识别装置表面增加疏水疏油涂层或在表面硬化层的制作涂料中添加疏水疏油材料，使得指纹识别装置表面的疏水成分密度增大，从而增强指纹识别装置表面的疏水疏油性能，提高湿手指使用环境下的指纹识别准确性和指纹识别速度。同时，有利于提高指纹识别装置表面的抗磨损性能。
上述实施例为本发明较佳的实施方式，但本发明的实施方式并不受上述实施例的限制，其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化，均应为等效的置换方式，都包含在本发明的保护范围之内。

Claims (11)

  1. 一种指纹识别装置，其特征在于，包括基板、感应芯片、第一覆盖层和第二覆盖层；所述感应芯片设于基板上，所述第一覆盖层覆盖于感应芯片的上方，所述第二覆盖层涂布于第一覆盖层的上表面；所述第二覆盖层为疏水疏油涂层。
  2. 根据权利要求1所述的指纹识别装置，其特征在于，所述第二覆盖层所使用的材料为高分子含氟聚合物。
  3. 根据权利要求2所述的指纹识别装置，其特征在于，所述第二覆盖层的制作方式为：将所述高分子含氟聚合物原液与二丙二醇甲醚溶剂按比例混合后均匀喷涂或蒸镀于第一覆盖层的上表面并使其充分固化，形成第二覆盖层。
  4. 根据权利要求3所述的指纹识别装置，其特征在于，所述高分子含氟聚合物原液与二丙二醇甲醚溶剂的混合比例为0.5～5:100。
  5. 根据权利要求4所述的指纹识别装置，其特征在于，所述第二覆盖层的厚度为几纳米至几十纳米。
  6. 根据权利要求1所述的指纹识别装置，其特征在于，所述第一覆盖层包括表面硬化层或盖板。
  7. 根据权利要求6所述的指纹识别装置，其特征在于，当所述第一覆盖层为表面硬化层时，所述表面硬化层的的制作涂料中添加有疏水疏油材料。
  8. 根据权利要求7所述的指纹识别装置，其特征在于，当所述第一覆盖层为表面硬化层时，所述表面硬化层的的制作涂料中添加的疏水疏油材料包括有机硅改性树脂或有机氟改性树脂。
  9. 根据权利要求8所述的指纹识别装置，其特征在于，当所述第一覆盖层为表面硬化层时，所述第一覆盖层的制作方式为：将所述疏水疏油材料与阻聚剂对羟基苯甲醚按比例混合到表面硬化层的制作涂料中，将混合后的涂料涂布在所述感应芯片的上方并使其充分固化，形成第一覆盖层。
  10. 根据权利要求9所述的指纹识别装置，其特征在于，所述疏水疏油材 料、阻聚剂对羟基苯甲醚与表面硬化层涂料的混合比例为1～5：20：100。
  11. 根据权利要求1至10任一项所述的指纹识别装置，其特征在于，还包括塑封材料，所述感应芯片通过塑封材料封装于基板上。
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