WO2017071130A1 - 像素模块及指纹识别系统 - Google Patents

像素模块及指纹识别系统 Download PDF

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Publication number
WO2017071130A1
WO2017071130A1 PCT/CN2016/071679 CN2016071679W WO2017071130A1 WO 2017071130 A1 WO2017071130 A1 WO 2017071130A1 CN 2016071679 W CN2016071679 W CN 2016071679W WO 2017071130 A1 WO2017071130 A1 WO 2017071130A1
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Prior art keywords
pixel
top electrode
resistor
module
pixel circuit
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PCT/CN2016/071679
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English (en)
French (fr)
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赵国豪
杨孟达
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深圳市汇顶科技股份有限公司
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Priority to EP16840289.9A priority Critical patent/EP3188079A4/en
Priority to KR1020177006548A priority patent/KR20170068442A/ko
Priority to US15/509,279 priority patent/US10354119B2/en
Publication of WO2017071130A1 publication Critical patent/WO2017071130A1/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
    • G06V40/1365—Matching; Classification
    • G06V40/1376—Matching features related to ridge properties or fingerprint texture
    • 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
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches

Definitions

  • the invention relates to a pixel module and a fingerprint identification system, in particular to a pixel module with electrostatic protection function and a fingerprint identification system.
  • a fingerprint recognition system includes a plurality of pixel modules arranged in an array, each pixel module including a top electrode and a pixel circuit. Since the fingerprint recognition system needs to use the top electrode to receive one finger contact, unlike the general integrated circuit package, the top electrode needs to be exposed outside the integrated circuit, and it is easy to generate static charge accumulated near the top electrode. Further, in the production process of the pixel module through wafer cutting and packaging, static charges are also accumulated in the vicinity of the top electrode. If the static charge accumulated on the top electrode is too large, the static charge will form an excessive electrostatic current. Causes damage to the pixel circuit.
  • the pixel circuit is usually disposed on the top electrode, and the circuit area of the pixel circuit must be less than or equal to the top layer
  • the area of the pole, in other words, the pixel module (or pixel circuit) applied to the fingerprint recognition system is limited by the circuit area, and cannot additionally accommodate an additional static protection circuit, and the lack of electrostatic protection may cause the fingerprint recognition system to be electrostatically charged. Damage to the current. Therefore, how to provide electrostatic protection pixel modules and fingerprint recognition systems has become one of the goals of the industry.
  • the technical problem to be solved by the present invention is to provide a pixel module having an electrostatic protection function to improve the above disadvantages of the prior art.
  • the present invention provides a pixel module, the pixel module including: a top electrode for receiving contact of a finger, a contact capacitance formed between the top electrode and the finger; a pixel circuit for Detecting a capacitance value of the contact capacitor; and a resistor coupled between the top electrode and the pixel circuit.
  • the resistor is used to suppress current flow between the top electrode and the pixel circuit.
  • the resistance of the resistor is greater than 10 ohms.
  • the resistor is formed from a polysilicon layer in an integrated chip process.
  • the pixel circuit is disposed under the top electrode, and a circuit area of the pixel circuit is less than or equal to an area of the top electrode.
  • the present invention further provides a fingerprint identification system, the fingerprint identification system comprising: a plurality of pixel modules, each pixel module comprising: a top electrode for accepting contact of a finger, a contact capacitance is formed between the top electrode and the finger; a pixel circuit is configured to detect a capacitance value of the contact capacitance; and a resistor is coupled between the top electrode and the pixel circuit; and a fingerprint determination module coupled to the A plurality of pixel modules are used to determine that each pixel module corresponds to a bee or a grain.
  • the pixel module provided by the present invention includes a resistor R coupled between the top electrode TP and the pixel circuit PC, and the resistor R is used to suppress the electrostatic current between the top electrode TP and the pixel circuit PC, that is, the fixed In terms of the static charge of the charge amount, the resistor R can effectively suppress the magnitude of the current of the electrostatic current, thereby achieving the effect of protecting the pixel circuit PC. Therefore, the pixel module provided by the invention has better electrostatic protection function.
  • FIG. 1 is a schematic diagram of a pixel module in the prior art.
  • FIG. 2 is a schematic diagram of a pixel module according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a fingerprint identification system according to an embodiment of the present invention.
  • FIG. 1 is a schematic diagram of a pixel module 10 .
  • the pixel module 10 includes a top electrode TP and a pixel circuit PC.
  • the top electrode TP is used to receive the contact of the finger FG, and the contact capacitance CF is formed between the top electrode TP and the finger FG. Since the top electrode TP needs to be exposed to receive the contact of the finger FG, and the pixel module 10 is subjected to a production process such as wafer cutting and packaging, static charges are accumulated in the vicinity of the top electrode TP.
  • the static charge near the top electrode TP when the pixel circuit PC is directly electrically connected to the top electrode TP, the static charge near the top electrode TP generates an electrostatic current I1 to the pixel circuit PC.
  • the electrostatic current I1 may cause damage to the pixel circuit PC.
  • FIG. 2 is a schematic diagram of a pixel module 20 according to an embodiment of the present invention.
  • the pixel module 20 includes a resistor R, a top electrode TP, and a pixel circuit PC. Similar to the pixel module 10,
  • the top electrode TP is used to receive the contact of the finger FG, and the contact capacitance CF is formed between the top electrode TP and the finger FG.
  • the pixel circuit PC is located directly below the top electrode TP, and the circuit area occupied by the pixel circuit PC is less than or equal to the area of the top electrode TP.
  • the pixel module 20 includes a resistor R coupled between the top electrode TP and the pixel circuit PC, and the resistor R is used to suppress the electrostatic current I2 between the top electrode TP and the pixel circuit PC, that is, In terms of the static charge of a fixed amount of charge, the resistance R can effectively suppress the magnitude of the current of the electrostatic current I2, thereby achieving the effect of protecting the pixel circuit PC.
  • the implementation of the resistor R is not limited.
  • the resistor R can be implemented by a polysilicon layer in a circuit layout, such as a resistor formed of a polysilicon layer in an integrated chip process, without being limited thereto.
  • the resistance value of the resistor R is also not limited.
  • the resistance of the resistor R is greater than 10 ohms.
  • the circuit of the pixel circuit is limited by the circuit area (corresponding to the pixel module used in the fingerprint recognition system, the circuit area occupied by the pixel circuit must be smaller than or equal to the area of the top electrode thereof), the pixel module cannot In addition, an additional static protection circuit is accommodated, and the pixel module cannot achieve electrostatic protection for the pixel circuit.
  • the pixel module of the present invention uses the resistance coupled between the top electrode and the pixel circuit to suppress the electrostatic current formed by the electrostatic charge, thereby achieving the effect of electrostatic protection.
  • FIG. 3 is a schematic diagram of a fingerprint identification system 30 according to an embodiment of the present invention.
  • the fingerprint identification system 30 includes the pixel modules 20_1 ⁇ 20_M and a fingerprint determination module 300.
  • the circuit structure of the pixel modules 20_1 ⁇ 20_M is the same as that of the pixel module 20, and is not described here.
  • the fingerprint determination module 300 is coupled to the pixel modules 20_1 - 20_M for determining, according to the output signals Vo_1 - Vo_M of the pixel modules 20_1 - 20_M , the position of the pixel modules 20_1 - 20_M corresponding to the Finger Ridge or the valley of the user fingerprint ( Finger Valley).
  • the resistor R included in the pixel modules 20_1 ⁇ 20_M can effectively suppress the formation of static charges.
  • the electrostatic current in turn, achieves the effect of electrostatic protection.
  • the pixel module of the present invention uses the resistance coupled between the top electrode and the pixel circuit to suppress the electrostatic current formed by the electrostatic charge, thereby achieving the effect of electrostatic protection.
  • the present invention also provides a fingerprint identification system, the fingerprint recognition system includes: a plurality of pixel modules, each pixel module includes: a top electrode for receiving contact with a finger, and a contact capacitance is formed between the top electrode and the finger; a pixel circuit for detecting a capacitance value of the contact capacitor; and a resistor coupled between the top electrode and the pixel circuit; and a fingerprint determination module coupled to the plurality of pixel modules for determining each pixel module Corresponds to a bee or a grain valley.
  • the fingerprint recognition system can suppress the electrostatic current formed by the static charge, thereby having the effect of electrostatic protection.

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Image Input (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

一种像素模块（20）及指纹识别系统，像素模块（20）包含有一顶层电极（TP），用来接受一手指（FG）的接触，顶层电极（TP）与手指（FG）之间形成有一接触电容（CF）；一像素电路（PC），用来检测该接触电容（CF）的电容值；以及一电阻（R），耦接于该顶层电极（TP）与该像素电路（PC）之间。该像素模块（20）能抑制静电荷所形成的静电电流，进而具有静电保护的效果。

Description

像素模块及指纹识别系统 技术领域
本发明涉及一种像素模块及指纹识别系统，尤其涉及一种具有静电防护功能的像素模块及指纹识别系统。
背景技术
随着科技日新月异，移动电话、数字相机、平板计算机、笔记本电脑等越来越多携带型电子装置已经成为了人们生活中必备的工具。由于携带型电子装置一般为个人使用，而具有一定的隐私性，因此其内部储存的数据，例如电话簿、相片、个人信息等等为私人所有。若电子装置一旦丢失，则这些数据可能会被他人所利用，而造成不必要的损失。虽然目前已有利用密码保护的方式来避免电子装置为他人所使用，但密码容易泄露或遭到破解，具有较低的安全性。并且，用户需记住密码才能使用电子装置，若忘记密码，则会带给使用者许多不便。因此，目前发展出利用个人指纹识别系统的方式来达到身份认证的目的，以提升数据安全性。
一般来说，指纹识别系统包含排列成数组的多个像素模块，每一像素模块包含一顶层电极及一像素电路。因指纹识别系统需利用顶层电极接受一手指的接触，而不同于一般集成电路封装，顶层电极需裸露于集成电路之外，容易产生静电荷累积在顶层电极附近。更进一步地，在像素模块经过晶圆切割及封装等生产过程中，亦造成静电荷累积在顶层电极附近，若累积于顶层电极的静电荷过大，静电荷会形成过大的静电电流，而造成像素电路的损毁。另一方面，像素电路通常设置于顶层电极，且像素电路的电路面积必须小于或等于顶层电 极的面积，换句话说，应用于指纹识别系统的像素模块(或像素电路)受到电路面积的限制，无法另外容纳额外的静电防护电路，而缺乏静电防护的功能，可能导致指纹识别系统受到静电电流的损害。因此，如何提供具静电防护的像素模块及指纹识别系统也就成为业界所努力的目标之一。
发明内容
本发明所要解决的技术问题在于提供一种具有静电防护功能的像素模块，以改善已知技术的上述缺点。
为了解决上述技术问题，本发明提供了一种像素模块，所述像素模块包含有：顶层电极，用来接受手指的接触，该顶层电极与该手指之间形成有接触电容；像素电路，用来检测该接触电容的电容值；以及电阻，耦接于该顶层电极与该像素电路之间。
优选地，该电阻用来抑制该顶层电极与该像素电路之间的电流。
优选地，该电阻的电阻值大于10欧姆。
优选地，该电阻由集成芯片制程中的多晶硅层形成。
优选地，该像素电路设置于该顶层电极之下，且该像素电路的电路面积小于或等于该顶层电极的面积。
为了更好的解决上述技术问题，本发明还提供了一种指纹识别系统，所述指纹识别系统包括：多个像素模块，每一像素模块包含有：顶层电极，用来接受手指的接触，该顶层电极与该手指之间形成有接触电容；像素电路，用来检测该接触电容的电容值；以及电阻，耦接于该顶层电极与该像素电路之间；以及指纹判断模块，耦接于该多个像素模块，用来判断每一像素模块对应至一纹蜂或一纹谷。
本发明提供的像素模块包含有耦接于顶层电极TP与像素电路PC之间的电阻R，电阻R用来抑制顶层电极TP与像素电路PC之间的静电电流，即对固定 电荷量的静电荷来说，电阻R可有效抑制静电电流的电流大小，进而达到保护像素电路PC的效果。所以，本发明提供的像素模块具有较好的静电防护功能。
附图说明
图1为现有技术中像素模块的示意图。
图2为本发明提供的一实施例中像素模块的示意图。
图3为本发明提供的一实施例中指纹识别系统的示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
请参考图1，图1为像素模块10的示意图，如图1所示，像素模块10包含有顶层电极TP以及像素电路PC。顶层电极TP用来接受手指FG的接触，顶层电极TP与手指FG之间形成有接触电容CF。由于顶层电极TP需裸露在外以接受手指FG的接触，以及像素模块10需经过晶圆切割及封装等生产过程，顶层电极TP附近会累积静电荷。需注意的是，当像素电路PC直接电性连接于顶层电极TP时，顶层电极TP附近的静电荷会产生静电电流I1至像素电路PC，当顶层电极TP附近的静电荷过大时，静电电流I1可能会造成像素电路PC的损毁。
为了降低静电荷的电流对像素电路可能造成的损毁，可于顶层电极与像素电路之间耦接电阻。请参考图2，图2为本发明实施例中像素模块20的示意图。像素模块20包含有电阻R、顶层电极TP及像素电路PC。类似于像素模块10， 顶层电极TP用来接受手指FG的接触，顶层电极TP与手指FG之间形成有接触电容CF。在电路布局中，像素电路PC位于顶层电极TP的正下方，且像素电路PC所占用的电路面积小于或等于顶层电极TP的面积。不同于像素模块10的是，像素模块20包含有耦接于顶层电极TP与像素电路PC之间的电阻R，电阻R用来抑制顶层电极TP与像素电路PC之间的静电电流I2，即对固定电荷量的静电荷来说，电阻R可有效抑制静电电流I2的电流大小，进而达到保护像素电路PC的效果。
一般来说，电阻R的实现方式并未有所限。举例来说，电阻R可通过电路布局中的多晶硅层来实现，例如电阻由集成芯片制程中的多晶硅层形成，而不限于此。而电阻R的电阻值亦未有所限，较佳地，电阻R的电阻值大于10欧姆。
现有技术中，因像素电路的电路受到电路面积的限制(对应用于指纹识别系统的像素模块来说，其像素电路所占用的电路面积必须小于或等于其顶层电极的面积)，像素模块无法另外容纳额外的静电防护电路，对像素电路来说，像素模块无法达成静电保护的效果。相比较之下，本发明的像素模块利用耦接于顶层电极与像素电路之间的电阻，抑制静电荷所形成的静电电流，而达到静电保护的效果。
另一方面，像素模块20可应用于指纹识别系统，请参考图3，图3为本发明实施例一指纹识别系统30的示意图。指纹识别系统30包含像素模块20_1～20_M以及一指纹判断模块300，像素模块20_1～20_M的电路结构与像素模块20相同，而在此不赘述。指纹判断模块300耦接于像素模块20_1～20_M，用来根据像素模块20_1～20_M的输出讯号Vo_1～Vo_M判断像素模块20_1～20_M所在位置对应至用户指纹的纹蜂(Finger Ridge)或纹谷(Finger Valley)。需注意的是，像素模块20_1～20_M所包含的电阻R可有效抑制静电荷所形成 的静电电流，进而达到静电保护的效果。
综上所述，本发明的像素模块利用耦接于顶层电极与像素电路之间的电阻，抑制静电荷所形成的静电电流，进而达到静电保护的效果。
本发明还提供一种指纹识别系统，指纹识别系统包括：多个像素模块，每一像素模块包含有：顶层电极，用来接受手指的接触，该顶层电极与该手指之间形成有接触电容；像素电路，用来检测该接触电容的电容值；以及电阻，耦接于该顶层电极与该像素电路之间；以及指纹判断模块，耦接于该多个像素模块，用来判断每一像素模块对应至一纹蜂或一纹谷。所述指纹识别系统能抑制静电荷所形成的静电电流，进而具有静电保护的效果。
以上所述仅为本发明的较佳实施例，凡依本发明申请专利范围所做的均等变化与修饰，皆应属本发明的涵盖范围。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种像素模块，其特征在于，所述像素模块包括：
    顶层电极，用来接受手指的接触，该顶层电极与该手指之间形成有接触电容；
    像素电路，用来检测该接触电容的电容值；以及
    电阻，耦接于该顶层电极与该像素电路之间。
  2. 如权利要求1所述的像素模块，其特征在于，该电阻用来抑制该顶层电极与该像素电路之间的电流。
  3. 如权利要求1所述的像素模块，其特征在于，该电阻的电阻值大于10欧姆。
  4. 如权利要求1所述的像素模块，其特征在于，该电阻由集成芯片制程中的多晶硅层形成。
  5. 如权利要求1所述的像素模块，其特征在于，该像素电路设置于该顶层电极之下，且该像素电路的电路面积小于或等于该顶层电极的面积。
  6. 一种指纹识别系统，其特征在于，所述指纹识别系统包括：多个像素模块，每一像素模块包含有：
    顶层电极，用来接受手指的接触，该顶层电极与该手指之间形成有接触电容；
    像素电路，用来检测该接触电容的电容值；以及
    电阻，耦接于该顶层电极与该像素电路之间；以及
    指纹判断模块，耦接于该多个像素模块，用来判断每一像素模块对应至一纹蜂或一纹谷。
  7. 如权利要求6所述的指纹识别系统，其特征在于，该电阻用来抑制该顶层电极与该像素电路之间的电流。
  8. 如权利要求6所述的指纹识别系统，其特征在于，该电阻的电阻值大于10欧姆。
  9. 如权利要求6所述的指纹识别系统，其特征在于，该电阻由集成芯片制程中的多晶硅层形成。
  10. 如权利要求6所述的指纹识别系统，其特征在于，该像素电路设置于该顶层电极之下，且该像素电路的电路面积小于或等于该顶层电极的面积。
PCT/CN2016/071679 2015-10-28 2016-01-21 像素模块及指纹识别系统 WO2017071130A1 (zh)

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CN105373776A (zh) 2016-03-02
KR20170068442A (ko) 2017-06-19
US20170277929A1 (en) 2017-09-28

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