WO2016070536A1 - 指纹检测电路、传感器和触摸屏 - Google Patents

指纹检测电路、传感器和触摸屏 Download PDF

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Publication number
WO2016070536A1
WO2016070536A1 PCT/CN2015/073914 CN2015073914W WO2016070536A1 WO 2016070536 A1 WO2016070536 A1 WO 2016070536A1 CN 2015073914 W CN2015073914 W CN 2015073914W WO 2016070536 A1 WO2016070536 A1 WO 2016070536A1
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Prior art keywords
fingerprint
amplifier
electrode
fingerprint detecting
capacitor
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English (en)
French (fr)
Inventor
詹昶
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Huiding Technology Co Ltd
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Priority to US15/109,151 priority Critical patent/US10162993B2/en
Priority to EP15856294.2A priority patent/EP3076273A4/en
Priority to KR1020167017602A priority patent/KR101964503B1/ko
Publication of WO2016070536A1 publication Critical patent/WO2016070536A1/zh
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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 OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers

Definitions

  • the present invention relates to the field of fingerprint detection technologies, and in particular, to a fingerprint detection circuit, a sensor, and a touch screen.
  • the electronic device when performing electronic fingerprint detection, the electronic device usually needs to connect the excitation signal to the user's finger through an external electrode.
  • the fingerprint sensor component shown in FIG. 1(a) and FIG. 1(b) needs to be passed through the external electrode.
  • U signal is connected to the user's finger, and the non-inverting input of the amplifier is connected to the virtual ground.
  • the pixel sensing circuit also needs to connect the ⁇ V finger to the user's finger while the amplifier's non-inverting input. Termination of the virtual ground results in two metal plates for each pixel.
  • the existing detection methods require the user's finger to contact the external electrode, connect the excitation signal to the user's finger through the external electrode, and form a fingerprint detection circuit with the circuit in the detection chip.
  • the present invention aims to solve at least one of the above technical problems.
  • a first object of the present invention is to provide a fingerprint detecting circuit.
  • the fingerprint detection circuit makes all signals of the circuit inside the detection chip, and does not need to connect the excitation signal to the user's finger through the external electrode, thereby increasing the applicable scene of fingerprint detection.
  • the fingerprint detecting circuit of the first aspect of the present invention includes: a detecting electrode, a first capacitor formed between the finger and the detecting electrode, a second capacitor formed between the finger and the virtual ground, and the detecting electrode and the virtual ground Forming a parasitic capacitance; the amplifier, the inverting input of the amplifier is connected to the detecting electrode, the non-inverting input of the amplifier is connected to the excitation signal; and the feedback capacitor, one end of the feedback capacitor is connected to the inverting input of the amplifier, and the feedback capacitor is another One end is connected to the output of the amplifier, and the output of the amplifier outputs the output signal of the fingerprint detecting circuit.
  • the detection electrode is a metal electrode.
  • the output signal is:
  • V out is the output signal of the fingerprint detection circuit
  • V in is the excitation signal
  • CP 1 is the parasitic capacitance
  • CF is the feedback capacitance
  • CS is the first capacitance
  • CP 2 is the second capacitance.
  • the output signal is:
  • a reset switch is also provided that connects the inverting input of the amplifier to the output of the amplifier.
  • the shape of the detecting electrode is a rectangle, a square or a circle.
  • a second object of the present invention is to provide a fingerprint detecting sensor.
  • the fingerprint detecting sensor of the second aspect of the present invention includes a plurality of pixel units, each of which corresponds to a fingerprint detecting circuit, and the fingerprint detecting circuit is the fingerprint detecting circuit of the first aspect of the present invention.
  • the plurality of pixel units are arranged in a two-dimensional array.
  • the rows and columns of the two-dimensional array are perpendicular to each other.
  • a third object of the present invention is to provide a touch screen.
  • a touch screen according to a third aspect of the present invention includes the fingerprint detecting sensor according to the second aspect of the present invention.
  • the fingerprint information of the user is embodied in the capacitance formed between the detecting electrode and the finger, and is embodied in the output signal, so that all signals of the fingerprint detecting circuit are inside the detecting chip, and the excitation signal does not need to be externally
  • the electrodes are connected to the user's fingers, thereby increasing the applicable scene of fingerprint detection.
  • the detector electrodes arranged in the array can be placed under the screen glass of the mobile terminal.
  • FIG. 1(a)-(c) are schematic structural diagrams of a detection circuit for fingerprint detection in the prior art
  • FIG. 2 is a schematic structural diagram of a fingerprint detecting circuit according to an embodiment of the present invention.
  • FIG. 3 is an equivalent circuit diagram of a fingerprint detecting circuit according to an embodiment of the present invention.
  • 4(a) to 4(b) are diagrams showing the arrangement of pixel units of a fingerprint detecting sensor according to an embodiment of the present invention.
  • a fingerprint detecting circuit, a sensor, and a touch screen according to an embodiment of the present invention are described below with reference to the accompanying drawings.
  • FIG. 2 is a schematic structural diagram of a fingerprint detecting circuit according to an embodiment of the present invention
  • FIG. 3 is an equivalent circuit diagram of a fingerprint detecting circuit according to an embodiment of the present invention.
  • the fingerprint detecting circuit includes a detecting electrode 1, an amplifier 2, and a feedback capacitor 3.
  • the detecting electrode 1 is a metal electrode, and the shape of the contact surface with the finger includes, but is not limited to, a rectangle, a square, or a circle.
  • the inverting input terminal of the amplifier 2 is connected to the detecting electrode 1, wherein the detecting capacitor 1 forms a first capacitance CS with the user's finger, and at the same time, the detecting electrode 1 forms a parasitic capacitance CP 1 for the virtual ground, and the user's finger is in the virtual ground A second capacitance CP 2 is formed.
  • the virtual ground refers to the alternating ground, that is, the DC voltage is 0, or it may have a certain DC voltage.
  • the non-inverting input of the amplifier 2 is connected to the excitation signal V in , one end of the feedback capacitor 3 is connected to the inverting input of the amplifier 2, and the other end of the feedback capacitor 3 is connected to the output of the amplifier 2.
  • the feedback capacitor 3 is connected across the inverting input terminal and the output terminal of the amplifier 2, wherein the capacitance of the feedback capacitor is CF.
  • the output of the amplifier 2 outputs the output signal of the fingerprint detecting circuit, that is, the output waveform of the output of the amplifier is the output signal V out of the fingerprint detecting circuit.
  • a reset switch is connected across the inverting input terminal and the output terminal of the amplifier, and the voltages of the two nodes are reset in the reset phase.
  • FIG. 3 An equivalent circuit diagram as shown in FIG. 3 can be obtained according to the fingerprint detecting circuit described above.
  • the output signal in Figure 3 can be expressed as:
  • V out is the output signal of the fingerprint detection circuit
  • V in is the excitation signal
  • CP 1 is the parasitic capacitance of the detection electrode to the virtual ground
  • CF is the feedback capacitance between the inverting input end and the output end of the amplifier
  • CS is the detection A first capacitance formed between the electrode and the finger
  • CP 2 is a second capacitance of the finger to the virtual ground.
  • the output signal can be simplified as:
  • CP 2 is greater than 100 ⁇ CS is exemplary, and it is not necessary that the CP 2 must achieve 100 times CS to simplify the output signal of the circuit. From the application point of view, the CP 2 is greater than 10 times CS. It also simplifies the output signal of the circuit.
  • the capacitance formed between the "peak” and the “valley” in the fingerprint and the detecting electrode is different due to the different shades of the fingerprint. Therefore, the fingerprint information of the user is reflected in the detecting electrode and a first capacitance CS is formed between the fingers, but also reflected in the output signal V out. That is to say, the capacitance between the detecting electrode and the user's finger can be obtained from the output signal output from the amplifier 3.
  • All the fingerprint signal detection circuit of the embodiment of the present invention by the user's fingerprint information embodied in the first capacitor CS is formed between the detection electrode and the finger, and further reflected in the output signal V out so that the fingerprint detection circuit are detected inside the chip, without the excitation signal V in is connected to the user's finger through the outer electrodes, thus increasing the fingerprint detection may be scenarios, for example, the following may be used in the detection electrode of the glass screen of the mobile terminal.
  • the present invention also provides a fingerprint detecting sensor, which includes a plurality of pixel units, each of which corresponds to a fingerprint detecting circuit, and the fingerprint detecting circuit is the fingerprint detecting circuit described in the above embodiment.
  • the pixel units are arranged in a two-dimensional array, that is, the detecting electrodes are also arranged in a two-dimensional array to form a contact surface for finger touch. As shown in FIGS. 4(a) and 4(b), in FIG. 4(b), the rows and columns of the two-dimensional array are perpendicular to each other.
  • the present invention also proposes a touch screen.
  • a touch screen includes the fingerprint detecting circuit or the fingerprint detecting sensor according to any one of the embodiments of the present invention.
  • the fingerprint information of the user is embodied in the first capacitor CS formed between the detecting electrode and the finger, and is further embodied in the output signal V out , so that all signals of the fingerprint detecting circuit are in the detecting chip.
  • the excitation signal V in is connected to the user's finger through the outer electrodes, thus increasing the fingerprint detection may be scenarios, for example, may be arranged in an array of detection electrodes are placed below the glass screen of a mobile terminal.
  • portions of the invention may be implemented in hardware, software, firmware or a combination thereof.
  • multiple steps or methods may be stored in the memory and executed by appropriate instructions
  • the software or firmware executed by the system is implemented.
  • it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.
  • the fingerprint information of the user is embodied in the capacitance formed between the detecting electrode and the finger, and is embodied in the output signal, so that all signals of the fingerprint detecting circuit are inside the detecting chip, and the excitation signal does not need to be externally
  • the electrodes are connected to the user's fingers, thereby increasing the applicable scene of fingerprint detection.
  • the detector electrodes arranged in the array can be placed under the screen glass of the mobile terminal.

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  • Image Input (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
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Abstract

一种指纹检测电路、传感器和触摸屏，其中，该指纹检测电路包括：检测电极（1），手指和检测电极（1）之间形成第一电容，手指和虚地之间形成第二电容，检测电极（1）和虚地之间形成寄生电容；放大器（2），放大器（2）的反相输入端与检测电极（1）相连，放大器（2）的正相输入端与激励信号相连；以及反馈电容（3），反馈电容（3）的一端与放大器（2）的反相输入端相连，反馈电容（3）的另一端与放大器（2）的输出端相连，放大器（2）的输出端输出指纹检测电路的输出信号。指纹检测电路，使得电路的所有信号均在检测芯片的内部，无需将激励信号通过外部电极连接到用户的手指上，从而增加了指纹检测的可应用场景，例如，可以将阵列排布的检测电极（1）放置于移动终端屏幕玻璃的下面。

Description

指纹检测电路、传感器和触摸屏 技术领域
本发明涉及指纹检测技术领域，尤其涉及一种指纹检测电路、传感器和触摸屏。
背景技术
目前，电容感应式的指纹检测装置已经开始应用在新一代的电子设备中，尤其是应用在移动终端中。然而电子设备在进行指纹检测时，通常需要通过外部电极将激励信号连接到用户的手指上，例如，如图1(a)和图1(b)所示的指纹传感器元件，需要通过外部电极将Usignal连接到用户的手指上，同时放大器的同相输入端接虚地，又如图1(c)所示像素感测电路，同样需要将ΔVfinger连接到用户的手指上，同时放大器的同相输入端接虚地，导致每个像素需要两块金属极板。换言之，现有的检测方式均需要用户的手指与外部电极接触，通过外部电极将激励信号连接到用户的手指上，再与检测芯片中的电路形成指纹检测回路。
发明内容
本发明旨在至少解决上述技术问题之一。
为此，本发明的第一个目的在于提出一种指纹检测电路。该指纹检测电路使得电路的所有信号均在检测芯片的内部，无需将激励信号通过外部电极连接到用户的手指上，从而增加了指纹检测的可应用场景。
为了实现上述目的，本发明第一方面实施例的指纹检测电路，包括：检测电极，手指和检测电极之间形成第一电容，手指和虚地之间形成第二电容，检测电极和虚地之间形成寄生电容；放大器，放大器的反相输入端与检测电极相连，放大器的正相输入端与激励信号相连；以及反馈电容，反馈电容的一端与放大器的反相输入端相连，反馈电容的另一端与放大器的输出端相连，放大器的输出端输出指纹检测电路的输出信号。
优选地，检测电极为金属电极。
优选地，输出信号为：
Figure PCTCN2015073914-appb-000001
其中，Vout为指纹检测电路的输出信号，Vin为激励信号，CP1为寄生电容，CF为反馈电容，CS为第一电容，CP2为第二电容。
优选地，当CP2与CS的差值大于预设阈值时，输出信号为：
Figure PCTCN2015073914-appb-000002
优选地，还包括连接放大器的反相输入端和放大器的输出端的复位开关。
优选地，检测电极的形状为矩形、正方形或者圆形。
本发明的第二个目的在于提出一种指纹检测传感器。为了实现上述目的，本发明第二方面实施例的指纹检测传感器包括多个像素单元，每个像素单元对应一个指纹检测电路，指纹检测电路为本发明第一方面实施例的指纹检测电路。
优选地，多个像素单元呈二维阵列排布。
优选地，二维阵列的行和列相互垂直。
本发明的第三个目的在于提出一种触摸屏。为了实现上述目的，本发明第三方面实施例的触摸屏，包括本发明第二方面实施例所述的指纹检测传感器。
本发明实施例通过将用户的指纹信息体现在检测电极与手指之间形成的电容中，进而体现在输出信号中，使得指纹检测电路的所有信号均在检测芯片的内部，无需将激励信号通过外部电极连接到用户的手指上，从而增加了指纹检测的可应用场景，例如，可以将阵列排布的检测电极放置于移动终端屏幕玻璃的下面。
本发明附加的方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。
附图说明
本发明上述的和/或附加的方面和优点从下面结合附图对实施例的描述中将变得明显和容易理解，其中，
图1(a)-(c)是现有技术中指纹检测的检测电路的结构示意图；
图2是根据本发明一个实施例的指纹检测电路的结构示意图；
图3是根据本发明一个实施例的指纹检测电路的等效电路图；以及
图4(a)-图4(b)是根据本发明一个实施例的指纹检测传感器的像素单元的排列方式。
具体实施方式
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本发明，而不能理解为对本发明的限制。相反，本发明的实施例包括落入所附加权利要求书的精神和内涵范围内的所有变化、修改和等同物。
在本发明的描述中，需要理解的是，术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性。在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。此外，在本发明的描述中，除非另有说明，“多个”的含义是两个或两个以上。
流程图中或在此以其他方式描述的任何过程或方法描述可以被理解为，表示包括一个或更多个用于实现特定逻辑功能或过程的步骤的可执行指令的代码的模块、片段或部分，并且本发明的优选实施方式的范围包括另外的实现，其中可以不按所示出或讨论的顺序，包括根据所涉及的功能按基本同时的方式或按相反的顺序，来执行功能，这应被本发明的实施例所属技术领域的技术人员所理解。
下面参考附图描述根据本发明实施例的指纹检测电路、传感器和触摸屏。
图2是根据本发明一个实施例的指纹检测电路的结构示意图，图3是根据本发明一个实施例的指纹检测电路的等效电路图。如图2所示，该指纹检测电路包括：检测电极1、放大器2和反馈电容3。
具体地，在本发明的一个实施例中，检测电极1为金属电极，与手指接触面的形状包括但不限于矩形、正方形或者圆形。例如，如图2中所示的由顶层金属形成的检测电极1。放大器2的反相输入端与检测电极1相连，其中，检测电极1与用户的手指之间形成第一电容CS，同时，检测电极1对虚地形成寄生电容CP1，用户的手指对虚地形成第二电容CP2。
应当理解的是，虚地是指交流地，即直流电压为0，或者也可以有一定的 直流电压。
放大器2的正相输入端与激励信号Vin相连，反馈电容3的一端与放大器2的反相输入端相连，反馈电容3的另一端与放大器2的输出端相连。换言之，放大器2的反相输入端和输出端之间跨接反馈电容3，其中，反馈电容的电容为CF。
放大器2的输出端输出指纹检测电路的输出信号，也就是说，放大器的输出端输出波形即为指纹检测电路的输出信号Vout。
进一步地，放大器的反相输入端和输出端之间跨接复位开关，在复位阶段重置上述两个节点的电压。
进一步而言，根据上述指纹检测电路可以得到如图3所示的等效电路图。图3中输出信号可以表示为：
Figure PCTCN2015073914-appb-000003
其中，Vout为指纹检测电路的输出信号，Vin为激励信号，CP1为检测电极对虚地的寄生电容，CF为放大器的反相输入端和输出端之间的反馈电容，CS为检测电极与手指之间形成的第一电容，CP2为手指对虚地的第二电容。
当CP2与CS的差值大于预设阈值时，例如，一般情况下，CP2大于100·CS，即当CP2远大于CP1时，输出信号可以简化为：
Figure PCTCN2015073914-appb-000004
应当理解的是，上述中的CP2大于100·CS是示例性的，并非是必须CP2达到100倍的CS才能简化电路的输出信号，从应用的角度而言CP2大于10倍的CS时也可以简化电路的输出信号。
根据简化后的输出信号可以看出，由于指纹的深浅不一，指纹中的“峰”和“谷”与检测电极之间形成的电容也不同，因此，用户的指纹信息会体现 在检测电极与手指之间形成的第一电容CS中，同时也会体现在输出信号Vout中。也就是说，可以根据放大器3输出的输出信号获取检测电极与用户手指之间的电容。
应当理解的是，根据放大器3输出的输出信号Vout转换为检测电极与用户手指之间的第一电容CS可以采用现有技术实现，此处不再复赘。
本发明实施例的指纹检测电路，通过将用户的指纹信息体现在检测电极与手指之间形成的第一电容CS中，进而体现在输出信号Vout中，使得指纹检测电路的所有信号均在检测芯片的内部，无需将激励信号Vin通过外部电极连接到用户的手指上，从而增加了指纹检测的可应用场景，例如，可以将检测电极应用在移动终端屏幕玻璃的下面。
本发明还提出一种指纹检测传感器，该指纹检测传感器包括多个像素单元，每个像素单元对应一个指纹检测电路，该指纹检测电路为上述实施例描述的指纹检测电路。
进一步地，像素单元呈二维阵列排布，即检测电极也呈二维阵列排布，形成供手指触摸的接触面。如图4(a)和图4(b)所示，在图4(b)中，二维阵列的行和列相互垂直。
为了实现上述实施例，本发明还提出一种触摸屏。
一种触摸屏包括本发明任一项实施例所述的指纹检测电路或者指纹检测传感器。
根据本发明实施例的触摸屏，通过将用户的指纹信息体现在检测电极与手指之间形成的第一电容CS中，进而体现在输出信号Vout中，使得指纹检测电路的所有信号均在检测芯片的内部，无需将激励信号Vin通过外部电极连接到用户的手指上，从而增加了指纹检测的可应用场景，例如，可以将阵列排布的检测电极放置于移动终端屏幕玻璃的下面。
应当理解，本发明的各部分可以用硬件、软件、固件或它们的组合来实现。在上述实施方式中，多个步骤或方法可以用存储在存储器中且由合适的指令执 行系统执行的软件或固件来实现。例如，如果用硬件来实现，和在另一实施方式中一样，可用本领域公知的下列技术中的任一项或他们的组合来实现：具有用于对数据信号实现逻辑功能的逻辑门电路的离散逻辑电路，具有合适的组合逻辑门电路的专用集成电路，可编程门阵列(PGA)，现场可编程门阵列(FPGA)等。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
尽管已经示出和描述了本发明的实施例，本领域的普通技术人员可以理解：在不脱离本发明的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由权利要求及其等同物限定。
工业实用性
本发明实施例通过将用户的指纹信息体现在检测电极与手指之间形成的电容中，进而体现在输出信号中，使得指纹检测电路的所有信号均在检测芯片的内部，无需将激励信号通过外部电极连接到用户的手指上，从而增加了指纹检测的可应用场景，例如，可以将阵列排布的检测电极放置于移动终端屏幕玻璃的下面。

Claims (10)

  1. 一种指纹检测电路，包括：
    检测电极，手指和所述检测电极之间形成第一电容，所述手指和虚地之间形成第二电容，所述检测电极和虚地之间形成寄生电容；
    放大器，所述放大器的反相输入端与所述检测电极相连，所述放大器的正相输入端与激励信号相连；以及
    反馈电容，所述反馈电容的一端与所述放大器的反相输入端相连，所述反馈电容的另一端与所述放大器的输出端相连，所述放大器的输出端输出所述指纹检测电路的输出信号。
  2. 如权利要求1所述的指纹检测电路，其中，所述检测电极为金属电极。
  3. 如权利要求1所述的指纹检测电路，其中，所述输出信号为：
    Figure PCTCN2015073914-appb-100001
    其中，Vout为所述指纹检测电路的输出信号，Vin为所述激励信号，CP1为所述寄生电容，CF为所述反馈电容，CS为所述第一电容，CP2为所述第二电容。
  4. 如权利要求3所述的指纹检测电路，其中，当CP2与CS的差值大于预设阈值时，所述输出信号为：
    Figure PCTCN2015073914-appb-100002
  5. 如权利要求1所述的指纹检测电路，其中，还包括连接所述放大器的反相输入端和所述放大器的输出端的复位开关。
  6. 如权利要求1所述的指纹检测电路，其中，所述检测电极的形状为矩形、正方形或者圆形。
  7. 一种指纹检测传感器，所述指纹检测传感器包括多个像素单元，每个像素单元对应一个指纹检测电路，所述指纹检测电路为权利要求1-6任一项所述的指纹检测电路。
  8. 如权利要求7所述的指纹检测传感器，其中，所述多个像素单元呈二维阵列排布。
  9. 如权利要求8所述的指纹检测传感器，其中，所述二维阵列的行和列相互垂直。
  10. 一种触摸屏，包括权利要求7-9中任一项所述的指纹检测传感器。
PCT/CN2015/073914 2014-11-07 2015-03-09 指纹检测电路、传感器和触摸屏 Ceased WO2016070536A1 (zh)

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