WO2019037441A1 - 指纹检测器件、指纹检测电路及其驱动方法、显示装置 - Google Patents

指纹检测器件、指纹检测电路及其驱动方法、显示装置 Download PDF

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WO2019037441A1
WO2019037441A1 PCT/CN2018/082794 CN2018082794W WO2019037441A1 WO 2019037441 A1 WO2019037441 A1 WO 2019037441A1 CN 2018082794 W CN2018082794 W CN 2018082794W WO 2019037441 A1 WO2019037441 A1 WO 2019037441A1
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reset
fingerprint detecting
transistor
pull
gate
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PCT/CN2018/082794
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English (en)
French (fr)
Inventor
丁小梁
王海生
刘英明
郑智仁
刘伟
曹学友
王鹏鹏
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京东方科技集团股份有限公司
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Priority to US16/316,789 priority Critical patent/US11398108B2/en
Publication of WO2019037441A1 publication Critical patent/WO2019037441A1/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
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • 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

Definitions

  • the present invention relates to the field of fingerprint detection, and in particular to a fingerprint detecting device, a fingerprint detecting circuit, a driving method thereof, and a display device.
  • An embodiment of the present application provides a fingerprint detecting device, including:
  • the first pole of the photosensitive sensing device is connected to the reference signal end, and the second pole is connected to the pull-down node;
  • the reset component being connected to the reset terminal and the pull-down node, configured to reset a potential of the pull-down node in a first phase of receiving the reset signal by the reset terminal;
  • a voltage output unit connected to the pull-down node, the strobe end, and an output end of the fingerprint detecting device for outputting a voltage signal to an output end of the fingerprint detecting device according to a potential of the pull-down node, and
  • the amount of change in the voltage signal outputted to the output end of the fingerprint detecting device is positively correlated with the amount of change in the potential of the pull-down node; wherein the second stage is the selection
  • the terminal receives the strobe signal and the reset terminal does not receive the reset signal.
  • the amount of change in the voltage signal output by the voltage output unit to the output end of the fingerprint detecting device is A of the amount of change in the potential of the pull-down node. Times, where A is greater than one.
  • the reset component includes a reset transistor
  • the reset transistor has a gate connected to the reset terminal, a first pole connected to the gate terminal, and a second pole connected to the pull-down node.
  • the voltage output component includes a gate transistor and a follow transistor
  • the gate and the first pole of the gate transistor are both connected to the gate terminal, and the second pole of the gate transistor and the first pole of the follower transistor are both connected to an output end of the fingerprint detecting device
  • the gate of the follower transistor is connected to the pull-down node, and the second pole of the follower transistor is connected to the reference signal terminal.
  • the oxide capacitance of the gate transistor and the follower transistor are the same in unit capacitance and electron mobility.
  • the photosensitive sensing device is a photodiode.
  • the reference signal terminal is a low level signal terminal.
  • An embodiment of the present application also provides a fingerprint detecting circuit including the above-described fingerprint detecting device.
  • the amount of change in the voltage signal output by the voltage output unit to the output end of the fingerprint detecting device is A of the amount of change in the potential of the pull-down node. Times, where A is greater than one.
  • the reset component includes a reset transistor
  • the reset transistor has a gate connected to the reset terminal, a first pole connected to the gate terminal, and a second pole connected to the pull-down node.
  • the voltage output component includes a gate transistor and a follow transistor
  • the gate and the first pole of the gate transistor are both connected to the gate terminal, and the second pole of the gate transistor and the first pole of the follower transistor are both connected to an output end of the fingerprint detecting device
  • the gate of the follower transistor is connected to the pull-down node, and the second pole of the follower transistor is connected to the reference signal terminal.
  • the oxide capacitance of the gate transistor and the follower transistor are the same in unit capacitance and electron mobility.
  • the photosensitive sensing device is a photodiode.
  • the strobe terminals of the same line of fingerprint detecting devices are connected to the same strobe signal line, and the reset ends of the same line of fingerprint detecting devices are connected to the same reset signal line; the output terminals of the same column of fingerprint detecting devices are connected A signal reading line.
  • An embodiment of the present application further provides a driving method of the foregoing fingerprint detecting circuit, including:
  • a reset signal is provided to a reset end of each of the fingerprint detecting devices to reset a potential of a pull-down node of the fingerprint detecting device, thereby causing the voltage outputting component to follow the pull-down node
  • the potential outputs a first voltage signal to an output of the fingerprint detecting device
  • the supply of the reset signal is stopped, and a gate signal is provided to the gate terminal row by row such that each of the voltage output components is output to the output of the corresponding fingerprint detecting device according to the potential of the pull-down node.
  • a second voltage signal is output, and a difference between the first voltage signal and the second voltage signal is positively correlated with a difference between a potential of the pull-down node in a reset phase and a detection phase.
  • the reset component in the fingerprint detecting device includes a reset transistor having a gate connected to the reset terminal, a first pole connected to the gate, and a second pole The pulldown nodes are connected, and wherein
  • the resetting phase further includes providing a strobe signal to the corresponding strobe while providing a reset signal to the reset terminal of each of the fingerprint detecting devices.
  • An embodiment of the present application further provides a display device including a display panel and a fingerprint detecting circuit disposed on the display panel, wherein the fingerprint detecting circuit is the fingerprint detecting circuit described above.
  • the display panel includes a first substrate and a second substrate disposed opposite to each other, and the fingerprint detecting circuit is disposed on a side of the first substrate facing the second substrate.
  • the reset component includes a reset transistor, and the voltage output component includes a gate transistor and a follow transistor;
  • the first substrate is provided with a light emitting device and a pixel driving circuit for driving the light emitting device to emit light
  • the pixel driving circuit includes a plurality of display transistors, the reset transistor, the gate transistor and the The follower transistor is disposed in the same layer as the display transistor.
  • the display panel includes a first substrate and a second substrate disposed opposite to each other, and the fingerprint detecting circuit is disposed on a side of the second substrate facing away from the first substrate.
  • FIG. 1 is a schematic structural view of a conventional fingerprint detecting circuit
  • FIG. 2 is a schematic structural diagram of components of a fingerprint detecting device provided in an embodiment of the present application.
  • FIG. 3 is a signal timing diagram of the fingerprint detecting device of FIG. 2;
  • FIG. 4 is a schematic structural diagram of a fingerprint detecting device provided in an embodiment of the present application.
  • FIG. 5 is a partial structural diagram of a fingerprint detecting circuit provided in an embodiment of the present application.
  • FIG. 6 is a signal timing diagram of the fingerprint detecting circuit of FIG. 5;
  • FIG. 7 is a first schematic structural diagram of a display device according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a second structure of a display device according to an embodiment of the present application.
  • Gate1 ⁇ Gate4 scan line; Sline1 ⁇ Slin3: read signal line; D1: photodiode; T1: switching transistor; 20: fingerprint detecting device; 21: photosensitive sensing device; 22: reset component; 23: voltage output component; PD: pull-down node; Tr: reset transistor; Ts: strobe transistor; Tf: follower transistor; Vsel: strobe terminal; Vout: output terminal; Vrst: reset terminal; Vss: reference signal terminal; Reset1, Reset2: heavy Signal line: Select1, Select2: strobe signal line; 30: display panel; 31: first substrate; 32: second substrate; 33: illuminating device; 34: pixel driving circuit.
  • FIG. 1 is a schematic structural diagram of a conventional fingerprint detecting circuit, which includes a plurality of fingerprint detecting devices, each of which includes a photodiode D1 and a switching transistor T1, which are distinguished by fingerprint valleys during fingerprint recognition.
  • a conventional fingerprint detecting circuit which includes a plurality of fingerprint detecting devices, each of which includes a photodiode D1 and a switching transistor T1, which are distinguished by fingerprint valleys during fingerprint recognition.
  • this detection method directly detects the current, and the difference in the current generated by the valley is small. Under a small light intensity, the current flowing through the read signal lines (Sline1 to Slin3) is small and is susceptible to noise interference, thereby affecting Detect the effect.
  • a fingerprint detecting device 20 is provided. As shown in FIG. 2, the fingerprint detecting device 20 includes a photosensitive sensing device 21, a reset member 22, and a voltage output member 23. The first pole of the photosensitive sensing device 21 is connected to the reference signal terminal Vss, and the second pole of the photosensitive sensing device 21 is connected to the pull-down node PD.
  • the reset component 22 is connected to the reset terminal Vrst of the fingerprint detecting device 20 and the pull-down node PD for receiving the first stage of the reset signal at the reset terminal Vrst (ie, the t1 phase in FIG. 3), the pull-down node The potential of the PD is reset.
  • the voltage output unit 23 is connected to the pull-down node PD, the strobe terminal Vsel, and the output terminal Vout of the fingerprint detecting device 20 for outputting a voltage signal to the output terminal Vout of the fingerprint detecting device 20 according to the potential of the pull-down node PD, and from the In the first stage to the second stage, the amount of change in the voltage signal output from the voltage output section 23 to the output terminal Vout of the fingerprint detecting device 20 is positively correlated with the amount of change in the potential of the pull-down node PD.
  • the pull-down node PD is a connection node between the second pole of the photosensitive sensing device 21, the reset component 22 and the voltage output component 23; the second phase is that the reset terminal Vrst does not receive the reset signal and the gate terminal Vsel receives To the stage of the strobe signal (ie, the t2 phase in Figure 3).
  • the reset component 22 can also be connected to the gate terminal Vsel, so that when the reset terminal Vrst receives the reset signal, the gate terminal Vsel and the pull-down node PD are turned on to use the signal pair of the gate terminal Vsel to pull down.
  • the node PD performs a reset.
  • the pull-down node PD is reset to reach the reset potential.
  • the output terminal Vout of the fingerprint detecting device 20 outputs the first voltage signal;
  • the light reflected by the finger is irradiated to the photosensitive sensing device 21,
  • the induced current is generated such that the potential of the pull-down node PD changes, the amount of change is ⁇ V1, and the voltage output component 23 outputs the second voltage signal to the output terminal Vout, and the difference ⁇ V2 between the second voltage signal and the first voltage signal ⁇ V1 is positively correlated.
  • ⁇ V1 can be obtained from ⁇ V2, thereby obtaining the amount of light detected by the photosensitive sensing device 21. Since the amount of light reflected by the valleys and ridges of the fingerprint is different, the fingerprint detection is realized by the difference in the amount of light detected by the different fingerprint detecting devices 20.
  • the output terminal Vout of the fingerprint detecting device 20 outputs a current signal.
  • the current signal is easily detected by the voltage coupling when it is detected by the detecting chip through the reading signal line.
  • Noise interference and in the present application is a voltage detection mode, the output terminal Vout directly outputs a voltage signal, and the coupling voltage is small relative to the detected voltage, thereby improving the anti-noise performance in the fingerprint detection process and improving Detection accuracy.
  • the amount of change in the voltage signal output by the voltage output unit 23 to the output terminal Vout of the fingerprint detecting device 20 is the amount of change in the potential of the pull-down node PD from the first stage to the second stage. A times, A is greater than 1, thereby achieving voltage amplification.
  • the voltage output component 23 can provide the voltage signal to the output terminal Vout after voltage amplification, thereby reducing the design requirements of the driver chip.
  • the specific structure of the fingerprint detecting device 20 is as shown in FIG. 4, wherein the photosensitive sensing device 21 is a photodiode; the anode of the first photosensitive diode of the photosensitive sensing device 21, and the cathode of the second extremely photosensitive diode of the photosensitive sensing device 21.
  • the reference signal terminal Vss is a low-level signal terminal, for example, a ground terminal.
  • the reset section 22 includes a reset transistor Tr whose gate is connected to the reset terminal Vrst, the first pole is connected to the gate terminal Vsel, and the second pole is connected to the pull-down node PD.
  • the voltage output part 23 includes a gate transistor Ts and a follower transistor Tf.
  • the gate and the first pole of the gate transistor Ts are both connected to the gate terminal Vsel, and the second pole of the gate transistor Ts and the first pole of the follower transistor Tf are both connected to the output terminal Vout of the fingerprint detecting device 20, following
  • the gate of the transistor Tf is connected to the pull-down node PD, and the second pole of the follower transistor Tf is connected to the reference signal terminal Vss.
  • the reset transistor Tr, the gate transistor Ts, and the follow transistor Tf are all N-type transistors, and accordingly, the reset signal and the strobe signal are both high level signals.
  • the specific working process of the fingerprint detecting device 20 includes:
  • a high level signal is supplied to both the reset terminal Vrst and the gate terminal Vsel, so that the reset transistor Tr, the gate transistor Ts, and the follow transistor Tf are both turned on.
  • the pull-down node PD is reset to a high level potential.
  • a low level signal is supplied to the reset terminal Vrst, a high level signal is supplied to the gate terminal Vsel, so that the reset transistor Tr is turned off; when the photodiode is subjected to When the light is generated, the current of the pull-down node PD drops, so that the voltage of the output terminal Vout changes accordingly.
  • the output node of the output unit 23 can calculate the small signal gain (i.e., the above A) of the voltage output unit 23 according to the equation (1) as:
  • ⁇ f is the electron mobility of the follower transistor Tf
  • ⁇ s is the electron mobility of the gate transistor Ts
  • C oxf is the unit capacitance of the oxide layer following the transistor Tf
  • C oxs is the unit of the oxide layer of the gate transistor Ts Capacitance
  • (W/L) f is the aspect ratio of the conductive channel following the transistor Tf
  • (W/L) s is the aspect ratio of the conductive channel of the gate transistor Ts.
  • the voltage signal amplification factor A of the voltage output section 23 can be controlled only by selecting the gate transistor Ts and the follower transistor Tf having appropriate parameters.
  • the unit capacitance and the electron mobility of the oxide layer of the gate transistor Ts and the follower transistor Tf are the same, and the above formula (1) can be further reduced to:
  • the amplification factor A is only related to the aspect ratio of the following transistor Tf and the gate transistor Ts.
  • a fingerprint detecting circuit which, as shown in FIG. 5, includes a plurality of the above-described fingerprint detecting devices 20.
  • the plurality of fingerprint detecting devices 20 can be arranged in a plurality of rows and columns, and the gate terminal Vsel of the fingerprint sensing device 20 of the same row is connected to the same strobe signal line (such as Select1 and Select2 in FIG. 5), and the weight of the fingerprint detecting device in the same row.
  • the terminal Vrst is connected to the same reset signal line (such as Reset1 and Reset2 in FIG. 5); the output terminal Vout of the same column fingerprint detecting device 20 is connected to the same signal reading line (Sline1, Sline2 in FIG. 5).
  • Each signal reading line can be connected to the detecting chip, so that the detecting chip detects and identifies the fingerprint through the voltage signal on the signal reading line.
  • a driving method of the above fingerprint detecting circuit including:
  • a reset signal is supplied to the reset terminal Vrst of each fingerprint detecting device 20 to reset the potential of the pull-down node PD of the fingerprint detecting device 20, thereby causing the voltage outputting section 23 to follow the potential of the pull-down node PD.
  • the first voltage signal is output to the output terminal Vout of the fingerprint detecting device 20.
  • a reset signal may be provided to the reset signal lines Reset1, Reset2, etc. one by one to provide a reset signal to the fingerprint detecting device 20 row by row until the reset of all the pull-down nodes PD is completed.
  • the supply of the reset signal is stopped, and a strobe signal is provided to the strobe terminal Vsel row by row (as shown in FIG. 6, the strobe signal is provided to the strobe signal lines Select1, Select2, etc. one by one), so that each The voltage output unit 23 outputs a second voltage signal to the output terminal Vout of the corresponding fingerprint detecting device according to the potential of the pull-down node PD, and the difference between the first voltage signal and the second voltage signal and the pull-down node PD in the reset phase It is positively correlated with the difference in voltage during the detection phase.
  • the reset phase is a phase in which the reset terminal Vrst of the fingerprint detecting device 20 of all rows receives the reset signal, and the reset phase can be regarded as the sum of the first phases of all the fingerprint detecting devices 20; accordingly, the detecting The stage can be seen as the sum of the second stages of all fingerprint detecting devices 20.
  • the reset component 22 includes the reset transistor Tr.
  • the reset phase further includes: providing a reset signal to the reset terminal Vrst of each of the fingerprint detecting devices, to the corresponding selection
  • the pass terminal Vsel provides a strobe signal such that the reset transistor Tr is turned on according to the reset signal to turn on the pull-down node PD and the strobe terminal Vsel, and the pull-down node PD receives the strobe signal to be reset.
  • a display device comprising a display panel 30 and a fingerprint detecting circuit disposed on the display panel 30, wherein the fingerprint detecting circuit is the above-described fingerprint detecting circuit provided by the present application.
  • the display panel 30 specifically includes a first substrate 31 and a second substrate 32.
  • the fingerprint detecting circuit is disposed on a surface of the first substrate 31 facing the second substrate 32 (as shown in FIG. 7 ). Shown, or disposed on a side surface of the second substrate 32 facing away from the first substrate 31 (as shown in FIG. 8).
  • the display panel 30 may be a liquid crystal display panel or a self-luminous display panel, for example, an organic electroluminescence display panel.
  • the display panel 30 is an organic electroluminescent display panel.
  • the first substrate 31 is provided with a light emitting device 33 and a pixel driving circuit 34 for driving the light emitting device 33 to emit light, and the fingerprint is detected. At this time, a part of the light emitted from the light-emitting device 33 is reflected by the finger to the fingerprint detecting device 20, thereby enabling fingerprint detection.
  • the pixel driving circuit 34 includes a plurality of display transistors, and the reset transistor Tr, the gate transistor Ts tube, and the follower transistor Tf are disposed in the same layer as the display transistor.
  • Each transistor can be a low temperature polysilicon thin film transistor.
  • the same layer setting means that the layers of the transistors disposed in the same layer are disposed in the same layer, such as the gates of the transistors are located in the same layer, the source and drain are located in the same layer, and the like, to simplify the fabrication process.
  • the photosensitive sensing device 21 may be located in the same layer as the light emitting device 33 or on the light emitting side of the light emitting device 33.
  • the overall detection accuracy of the fingerprint detecting circuit using the fingerprint detecting device is high, so that the display device provided in the embodiment provides better use for the user. Experience.
  • the output terminal outputs the voltage.
  • the signal and the coupling voltage are small relative to the detection voltage, thereby improving the anti-noise performance in the fingerprint detection process and improving the detection accuracy of the fingerprint detection circuit; and the voltage output component can output the voltage to the output terminal simultaneously
  • the effect of voltage amplification further improves the noise immunity and reduces the manufacturing cost and volume of the detection chip.

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Abstract

一种指纹检测器件（20）、指纹检测电路及其驱动方法和显示装置，该指纹检测器件（20）包括：光敏感应器件（21），第一极与参考信号端（Vss）相连，第二极与下拉节点（PD）相连；重置部件（22），用于在重置端（Vrst）接收到重置信号的第一阶段，对下拉节点（PD）的电位进行重置；电压输出部件（23），与下拉节点（PD）、选通端（Vsel）和指纹检测器件（20）的输出端（Vout）相连，用于根据下拉节点（PD）的电位向输出端（Vout）输出电压信号，并且，从第一阶段到第二阶段，向输出端（Vout）输出的电压信号的变化量与下拉节点（PD）的电位的变化量正相关；下拉节点（PD）为光敏感应器件（21）的第二极、重置部件（22）和电压输出部件（23）之间的连接节点；第二阶段为选通端（Vsel）接收到选通信号且重置端（Vrst）未接收到重置信号的阶段。该指纹检测器件（20）、指纹检测电路及其驱动方法和显示装置能够提高指纹检测的抗噪性能，提高检测精度。

Description

指纹检测器件、指纹检测电路及其驱动方法、显示装置
相关申请的交叉引用
本申请要求于2017年8月24日提交的中国专利申请No.201710733883.0的优先权，所公开的内容以引用的方式合并于此。
技术领域
本申请涉及指纹检测领域，具体涉及一种指纹检测器件、指纹检测电路及其驱动方法、显示装置。
背景技术
近年来，随着技术的高速发展，具有生物识别功能的移动产品逐渐进入人们的生活工作中，指纹技术凭借着其唯一身份特性，备受人们重视。基于硅基工艺的按压式与滑动式指纹识别技术已经整合入移动产品中，未来人们关注的核心是显示区域内的指纹识别技术。
发明内容
本申请的一个实施例提供了一种指纹检测器件，包括：
光敏感应器件，所述光敏感应器件的第一极与参考信号端相连，第二极与下拉节点相连；
重置部件，所述重置部件与重置端和所述下拉节点相连，用于在所述重置端接收到重置信号的第一阶段，对所述下拉节点的电位进行重置；
电压输出部件，所述电压输出部件与所述下拉节点、选通端和指纹检测器件的输出端相连，用于根据所述下拉节点的电位向指纹检测器件的输出端输出电压信号，并且，从所述第一阶段到第二阶段，向所述指纹检测器件的输出端输出的电压信号的变化量与所述下拉节点的电位的变化量正相关；其中，所述第二阶段为所述选通端接收到选通信号且所述重置端未接收到重置信号的阶段。
在一些实施例中，从所述第一阶段到所述第二阶段，所述电压输出部件向指纹检测器件的输出端输出的电压信号的变化量是所述下拉节点的电位的变化量的A倍，其中A大于1。
在一些实施例中，所述重置部件包括重置晶体管，
所述重置晶体管的栅极与所述重置端相连，第一极与所述选通端相连，第二极与所述下拉节点相连。
在一些实施例中，所述电压输出部件包括选通晶体管和跟随晶体管；
所述选通晶体管的栅极和第一极均与所述选通端相连，所述选通晶体管的第二极和所述跟随晶体管的第一极均与所述指纹检测器件的输出端相连，所述跟随晶体管的栅极与所述下拉节点相连，所述跟随晶体管的第二极与所述参考信号端相连。
在一些实施例中，所述选通晶体管和所述跟随晶体管的氧化层的单位电容、电子迁移率均相同。
在一些实施例中，所述光敏感应器件为光敏二极管。
在一些实施例中，所述参考信号端为低电平信号端。
本申请的一个实施例还提供了一种指纹检测电路，其中，包括上述的指纹检测器件。
在一些实施例中，从所述第一阶段到所述第二阶段，所述电压输出部件向指纹检测器件的输出端输出的电压信号的变化量是所述下拉节点的电位的变化量的A倍，其中A大于1。
在一些实施例中，所述重置部件包括重置晶体管，
所述重置晶体管的栅极与所述重置端相连，第一极与所述选通端相连，第二极与所述下拉节点相连。
在一些实施例中，所述电压输出部件包括选通晶体管和跟随晶体管；
所述选通晶体管的栅极和第一极均与所述选通端相连，所述选通晶体管的第二极和所述跟随晶体管的第一极均与所述指纹检测器件的输出端相连，所述跟随晶体管的栅极与所述下拉节点相连，所述跟随晶体管的第二极与所述参考信号端相连。
在一些实施例中，所述选通晶体管和所述跟随晶体管的氧化层的单位电容、电子迁移率均相同。
在一些实施例中，所述光敏感应器件为光敏二极管。
在一些实施例中，同一行指纹检测器件的选通端连接同一条选通信号线，同一行指纹检测器件的重置端连接同一条重置信号线；同一列指纹检测器件的输出端连接同一条信号读取线。
本申请的一个实施例还提供了一种上述指纹检测电路的驱动方法，包括：
在重置阶段，向每个所述指纹检测器件的重置端提供重置信号，以对所述指纹检测器件的下拉节点的电位进行重置，从而使所述电压输出部件根据所述下拉节点的电位向指纹检测器件的输出端输出第一电压信号；
在检测阶段，停止提供所述重置信号，并逐行向所述选通端提供选通信号，以使得每个所述电压输出部件根据所述下拉节点的电位向相应指纹检测器件的输出端输出第二电压信号，且所述第一电压信号与所述第二电压信号之差与所述下拉节点的电位在重置阶段和检测阶段的差值正相关。
在一些实施例中，指纹检测器件中的重置部件包括重置晶体管，所述重置晶体管的栅极与所述重置端相连，第一极与所述选通端相连，第二极与所述下拉节点相连，并且其中
所述重置阶段还包括：向每个所述指纹检测器件的重置端提供重置信号的同时，向相应的选通端提供选通信号。
本申请的一个实施例还提供了一种显示装置，包括显示面板和设置在显示面板上的指纹检测电路，其中，所述指纹检测电路为上述述的指纹检测电路。
在一些实施例中，所述显示面板包括相对设置的第一基板和第二基板，所述指纹检测电路设置在所述第一基板朝向所述第二基板的一侧上。
在一些实施例中，所述重置部件包括重置晶体管，所述电压输出部件包括选通晶体管和跟随晶体管；
所述第一基板上设置有发光器件和用于驱动所述发光器件发光的像素驱动电路，所述像素驱动电路包括多个显示用晶体管，所述重置晶体管、所述选通晶体管和所述跟随晶体管与所述显示用晶体管同层设置。
在一些实施例中，所述显示面板包括相对设置的第一基板和第二基板，所述指纹检测电路设置在所述第二基板背离所述第一基板的一侧上。
附图说明
附图是用来提供对本申请的进一步理解，并且构成说明书的一部分，与下面的具体实施方式一起用于解释本申请，但并不构成对本申请的限制。在附图中：
图1是现有的指纹检测电路的结构示意图；
图2是本申请实施例中提供的指纹检测器件的部件结构示意图；
图3是图2的指纹检测器件的信号时序图；
图4是本申请实施例中提供的指纹检测器件的具体结构示意图；
图5是本申请实施例中提供的指纹检测电路的部分结构示意图；
图6是图5的指纹检测电路的信号时序图；
图7是本申请实施例提供的显示装置的第一种结构示意图；
图8是本申请实施例提供的显示装置的第二种结构示意图。
其中，附图标记为：
Gate1～Gate4：扫描线；Sline1～Slin3：读取信号线；D1：光敏二极管；T1：开关晶体管；20：指纹检测器件；21：光敏感应器件；22：重置部件；23：电压输出部件；PD：下拉节点；Tr：重置晶体管；Ts：选通晶体管；Tf：跟随晶体管；Vsel：选通端；Vout：输出端；Vrst：重置端；Vss：参考信号端；Reset1、Reset2：重置信号线：Select1、Select2：选通信号线；30：显示面板；31：第一基板；32：第二基板；33：发光器件；34：像素驱动电路。
具体实施方式
以下结合附图对本申请的具体实施方式进行详细说明。应当理解的是，此处所描述的具体实施方式仅用于说明和解释本申请，并不用于限制本申请。
图1为现有的指纹检测电路的结构示意图，其包括多个指纹检测器件，每个指纹检测器件包括一个光敏二极管D1和一个开关晶体管T1，在进行指纹识别时，由于指纹谷脊间的差异，光线照射到手指上会产生不同的反射，从而使得到达光敏二极管D1处的光强出现变化，产生不同的光电流差异，同时，逐行地为扫描线(Gate1～Gate4)提供扫描信号，从而逐行开启开关晶体管T1，然后检测芯片从各条读取信号线(Sline1～Slin3)上读取出各个光敏二极管D1的电流差异，即可实现对指纹谷脊的检测。
但这种检测方法是直接检测电流，而谷脊产生的电流差异很小，在小光强下，读取信号线(Sline1～Slin3)上流过的电流很小，且容易受到噪声干扰，从而影响检测效果。
作为本申请的一方面，提供了一种指纹检测器件20，如图2所示，指纹检测器件20包括光敏感应器件21、重置部件22和电压输出部件23。光敏感应器件21的第一极与参考信号端Vss相连，光敏感应器件21的第二极与下拉节点PD相连。重置部件22与指纹检测器件20的重置端Vrst和下拉节点PD相连，用于在重置端Vrst接收到重置信号的第一阶段(即，图3中的t1阶段)，对下拉节点PD的电位进行重置。电压输出部件23与下拉节点PD、选通端Vsel和指纹检测器件20的输出端Vout相连，用于根据下拉节点PD的电位向指纹检测器件20的输出端Vout输出电压信号，并且，从所述第一阶段到第二阶段，电压输出部件23向指纹检测器件20的输出端Vout输出的电压信号的变化量与下拉节点PD的电位的变化量正相关。其中，下拉节点PD为光敏感应器件21的第二极、重置部件22和电压输出部件23之间的连接节点；第二阶段为重置端Vrst未接收到重置信号且选通端Vsel接收到选通信号的阶段(即，图3中的t2阶段)。
另外，重置部件22也可以与选通端Vsel连接，从而在重置端Vrst接收到重置信号时，将选通端Vsel与下拉节点PD导通，以利用选通端Vsel的信号对下拉节点PD进行重置。
在第一阶段，下拉节点PD被重置而达到重置电位，此时，指纹检测器件20的输出端Vout输出第一电压信号；在第二阶段，手指反射的光照射至光敏感应器件21，产生感应电流，从而使得下拉节点PD的电位发生变化，变化量为ΔV1，而电压输出部件23向输出端Vout输出第二电压信号，且该第二电压信号与第一电压信号的差值ΔV2与ΔV1正相关，因此，检测芯片与指纹检测器件20的输出端Vout相连时，可以根据ΔV2得出ΔV1，进而获得光敏感应器件21检测到的光线量。由于指纹的谷和脊反射的光线量不同，因此，通过不同指纹检测器件20检测到的光线量的差异，实现对指纹检测。
在现有技术中，指纹检测器件20的输出端Vout输出的是电流信号，当电流较小时，电流信号经过读取信号线而被检测芯片检测的过程中，很容易受到因电压耦合而产生的噪声干扰，而在本申请采用的是电压检测的方式，输出端Vout直接输出电压信号，耦合电压相对于检测到的电压是很小的，从而提高了指纹检测过程中的抗噪性能，提高了检测精度。
在一些实施例方式中，从所述第一阶段到所述第二阶段，电压输出部件23向指纹检测器件20的输出端Vout输出的电压信号的变化量是下拉节点PD的电位的变化量的A倍，A大于1，从而实现了电压放大。
现有技术中利用电流信号检测指纹时，由于电流较小，因此需要在检测芯片前端设置放大倍数较大的放大器，且要求前端放大器的偏置电流要小，从而增加了检测芯片的制作成本，增大了检测芯片的体积。而本申请中，电压输出部件23可以在对电压信号进行电压放大后将其提供至输出端Vout，从而降低了驱动芯片的设计要求。
指纹检测器件20的具体结构如图4所示，其中，光敏感应器件21为光敏二极管；光敏感应器件21的第一极为光敏二极管的阳极，光敏感应器件21的第二极为光敏二极管的阴极。上述参考信号端Vss 为低电平信号端，例如，接地端。
重置部件22包括重置晶体管Tr，该重置晶体管Tr的栅极与重置端Vrst相连，第一极与选通端Vsel相连，第二极与下拉节点PD相连。
电压输出部件23包括选通晶体管Ts和跟随晶体管Tf。其中，选通晶体管Ts的栅极和第一极均与选通端Vsel相连，选通晶体管Ts的第二极和跟随晶体管Tf的第一极均与指纹检测器件20的输出端Vout相连，跟随晶体管Tf的栅极与下拉节点PD相连，跟随晶体管Tf的第二极与参考信号端Vss相连。
在本申请中，重置晶体管Tr、选通晶体管Ts和跟随晶体管Tf均为N型晶体管，相应地，所述重置信号和所述选通信号均为高电平信号。指纹检测器件20的具体工作过程包括：
在第一阶段(即，图3中的t1阶段)，向重置端Vrst和选通端Vsel均提供高电平信号，从而使得重置晶体管Tr、选通晶体管Ts和跟随晶体管Tf均导通，下拉节点PD重置为高电平电位。在第二阶段(即，图3中的t2阶段)，向重置端Vrst提供低电平信号，向选通端Vsel提供高电平信号，以使得重置晶体管Tr关断；当光敏二极管受光照时产生电流，下拉节点PD电位下降，从而使得输出端Vout的电压相应变化。
在第一阶段和第二阶段，由于跟随晶体管Tf和选通晶体管Ts为串联关系，因此流过二者的电流相等，以下拉节点PD作为电压输出部件23的输入节点，以输出端Vout作为电压输出部件23的输出节点，则可以按式(1)计算电压输出部件23的小信号增益(也就是上述A)为：
A＝gm(Tf)/gm(Ts)
＝sqrt(2μ fC oxf(W/L) f*I)/sqrt(2μ sC oxs(W/L) s*I)    (1)
其中，μ f为跟随晶体管Tf的电子迁移率；μ s为选通晶体管Ts的电子迁移率；C oxf为跟随晶体管Tf的氧化层的单位电容；C oxs为选通晶体管Ts的氧化层的单位电容；(W/L) f为跟随晶体管Tf的导电沟道的宽长比；(W/L) s为选通晶体管Ts的导电沟道的宽长比。
可见，只需要选择具有合适参数的选通晶体管Ts和跟随晶体管Tf，就可以控制电压输出部件23的电压信号放大倍数A。
在一些实施例方式中，选通晶体管Ts和跟随晶体管Tf的氧化层的单位电容、电子迁移率均相同，上式(1)则可以进一步化简为：
A＝sqrt((W/L) f/(W/L) s)      (2)
这时，放大倍数A仅与跟随晶体管Tf和选通晶体管Ts的宽长比相关。
作为本申请的另一方面，提供了一种指纹检测电路，如图5所示，该指纹检测电路包括多个上述指纹检测器件20。
多个指纹检测器件20可以排成多行多列，同一行指纹检测器件20的选通端Vsel连接同一条选通信号线(如图5中的Select1、Select2)，同一行指纹检测器件的重置端Vrst连接同一条重置信号线(如图5中的Reset1、Reset2)；同一列指纹检测器件20的输出端Vout连接同一条信号读取线(如图5中的Sline1、Sline2)。每条信号读取线均可以与检测芯片相连，以使所述检测芯片通过信号读取线上的电压信号对指纹进行检测、识别。
作为本申请的第三方面，提供一种上述指纹检测电路的驱动方法，包括：
在重置阶段，向每个指纹检测器件20的重置端Vrst提供重置信号，以对指纹检测器件20的下拉节点PD的电位进行重置，从而使电压输出部件23根据下拉节点PD的电位向指纹检测器件20的输出端Vout输出第一电压信号。如图6所示，可以逐条向重置信号线Reset1、Reset2等提供重置信号，以逐行向指纹检测器件20提供重置信号，直至完成所有下拉节点PD的重置。
在检测阶段，停止提供所述重置信号，并逐行向选通端Vsel提供选通信号(如图6所示，逐条向选通信号线Select1、Select2等提供选通信号)，以使得每个电压输出部件23根据下拉节点PD的电位向相应指纹检测器件的输出端Vout输出第二电压信号，且所述第一电压信号与所述第二电压信号之差与下拉节点PD在重置阶段和检测阶段的电压的差值正相关。
其中，重置阶段为所有行的指纹检测器件20的重置端Vrst均接收到重置信号的阶段，该重置阶段可以看作所有指纹检测器件20的第一阶段的总和；相应地，检测阶段可以看作所有指纹检测器件20的第二阶段的总和。
如上文所述，重置部件22包括重置晶体管Tr，这种情况下，重置阶段还包括：向每个所述指纹检测器件的重置端Vrst提供重置信号的同时，向相应的选通端Vsel提供选通信号，从而使得重置晶体管Tr根据重置信号导通，以将下拉节点PD与选通端Vsel导通，下拉节点PD接收到选通信号而重置。
作为本申请的第四方面，提供一种显示装置，包括显示面板30和设置在显示面板30上的指纹检测电路，其中，所述指纹检测电路为本申请提供的上述指纹检测电路。
如图7和图8所示，显示面板30具体包括第一基板31和第二基板32，所述指纹检测电路设置在第一基板31朝向第二基板32的一侧表面上(如图7所示)，或者设置在第二基板32背离第一基板31的一侧表面上(如图8所示)。
其中，显示面板30可以为液晶显示面板，也可以为自发光显示面板，例如，有机电致发光显示面板。作为本申请的一种具体实施方式，显示面板30为有机电致发光显示面板，具体地，第一基板31上设置有发光器件33和用于驱动发光器件33发光的像素驱动电路34，检测指纹时，发光器件33所发射光线的一部分被手指反射至指纹检测器件20，从而能够进行指纹检测。在一些实施例中，如图7所示，像素驱动电路34包括多个显示用晶体管，上述重置晶体管Tr、选通晶体Ts管和跟随晶体管Tf与所述显示用晶体管同层设置。各晶体管可以为低温多晶硅薄膜晶体管。需要说明的是，所述同层设置是指，同层设置的晶体管的各个层同层设置，如各晶体管的栅极位于同一层，源漏极位于同一层，等等，以简化制作工艺。另外，光敏感应器件21可以与发光器件33位于同层，也可以位于发光器件33的出光侧。
由于所述指纹检测器件的抗噪性能较高，因此，采用所述指纹 检测器件的指纹检测电路的整体检测精度较高，从而使得本实施例中提供的显示装置为用户带来更好的使用体验。
综上所述，利用本申请提供的指纹检测器件进行指纹检测时，由于采用的是电压检测的方式，与电流检测的方式相比，采用电压检测的方式进行检测时，输出端输出的是电压信号，耦合电压相对于检测电压是很小的，从而提高指纹检测过程中的抗噪性能，提高了指纹检测电路的检测精度；并且，电压输出部件能够在向输出端输出电压的同时，起到电压放大的作用，从而进一步提高抗噪性能，且降低了检测芯片的制作成本和体积。
可以理解的是，以上实施方式仅仅是为了说明本发明的原理而采用的示例性实施方式，然而本发明并不局限于此。对于本领域内的普通技术人员而言，在不脱离本发明的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本发明的保护范围。

Claims (20)

  1. 一种指纹检测器件，包括：
    光敏感应器件，所述光敏感应器件的第一极与参考信号端相连，第二极与下拉节点相连；
    重置部件，所述重置部件与重置端和所述下拉节点相连，用于在所述重置端接收到重置信号的第一阶段，对所述下拉节点的电位进行重置；
    电压输出部件，所述电压输出部件与所述下拉节点、选通端和指纹检测器件的输出端相连，用于根据所述下拉节点的电位向指纹检测器件的输出端输出电压信号，并且，从所述第一阶段到第二阶段，向所述指纹检测器件的输出端输出的电压信号的变化量与所述下拉节点的电位的变化量正相关；其中，所述第二阶段为所述选通端接收到选通信号且所述重置端未接收到重置信号的阶段。
  2. 根据权利要求1所述的指纹检测器件，其中，从所述第一阶段到所述第二阶段，所述电压输出部件向指纹检测器件的输出端输出的电压信号的变化量是所述下拉节点的电位的变化量的A倍，其中A大于1。
  3. 根据权利要求1或2所述的指纹检测器件，其中，所述重置部件包括重置晶体管，所述重置晶体管的栅极与所述重置端相连，第一极与所述选通端相连，第二极与所述下拉节点相连。
  4. 根据权利要求1至3中任一项所述的指纹检测器件，其中，所述电压输出部件包括选通晶体管和跟随晶体管；
    所述选通晶体管的栅极和第一极均与所述选通端相连，所述选通晶体管的第二极和所述跟随晶体管的第一极均与所述指纹检测器件的输出端相连，所述跟随晶体管的栅极与所述下拉节点相连，所述跟随晶体管的第二极与所述参考信号端相连。
  5. 根据权利要求4所述的指纹检测器件，其中，所述选通晶体管和所述跟随晶体管的氧化层的单位电容、电子迁移率均相同。
  6. 根据权利要求1或2所述的指纹检测器件，其中，所述光敏感应器件为光敏二极管。
  7. 根据权利要求1或2所述的指纹检测器件，其中，所述参考信号端为低电平信号端。
  8. 一种指纹检测电路，其中，包括多个权利要求1所述的指纹检测器件。
  9. 根据权利要求8所述的指纹检测电路，其中，从所述第一阶段到所述第二阶段，所述电压输出部件向指纹检测器件的输出端输出的电压信号的变化量是所述下拉节点的电位的变化量的A倍，其中A大于1。
  10. 根据权利要求8或9所述的指纹检测电路，其中，所述重置部件包括重置晶体管，
    所述重置晶体管的栅极与所述重置端相连，第一极与所述选通端相连，第二极与所述下拉节点相连。
  11. 根据权利要求8至10中任一项所述的指纹检测电路，其中，所述电压输出部件包括选通晶体管和跟随晶体管；
    所述选通晶体管的栅极和第一极均与所述选通端相连，所述选通晶体管的第二极和所述跟随晶体管的第一极均与所述指纹检测器件的输出端相连，所述跟随晶体管的栅极与所述下拉节点相连，所述跟随晶体管的第二极与所述参考信号端相连。
  12. 根据权利要求11所述的指纹检测电路，其中，所述选通晶体管和所述跟随晶体管的氧化层的单位电容、电子迁移率均相同。
  13. 根据权利要求8或9所述的指纹检测电路，其中，所述光敏感应器件为光敏二极管。
  14. 根据权利要求8所述的指纹检测电路，其中，同一行指纹检测器件的选通端连接同一条选通信号线，同一行指纹检测器件的重置端连接同一条重置信号线；同一列指纹检测器件的输出端连接同一条信号读取线。
  15. 一种权利要求14所述的指纹检测电路的驱动方法，包括：
    在重置阶段，向每个所述指纹检测器件的重置端提供重置信号，以对所述指纹检测器件的下拉节点的电位进行重置，从而使所述电压输出部件根据所述下拉节点的电位向指纹检测器件的输出端输出第一电压信号；
    在检测阶段，停止提供所述重置信号，并逐行向所述选通端提供选通信号，以使得每个所述电压输出部件根据所述下拉节点的电位向相应指纹检测器件的输出端输出第二电压信号，且所述第一电压信号与所述第二电压信号之差与所述下拉节点的电位在重置阶段和检测阶段的差值正相关。
  16. 根据权利要求15所述的驱动方法，其中，指纹检测器件中的重置部件包括重置晶体管，所述重置晶体管的栅极与所述重置端相连，第一极与所述选通端相连，第二极与所述下拉节点相连，并且其中
    所述重置阶段还包括：向每个所述指纹检测器件的重置端提供重置信号的同时，向相应的选通端提供选通信号。
  17. 一种显示装置，包括显示面板和设置在显示面板上的指纹 检测电路，其中，所述指纹检测电路为权利要求8至14中任一项所述的指纹检测电路。
  18. 根据权利要求17所述的显示装置，其中，所述显示面板包括相对设置的第一基板和第二基板，所述指纹检测电路设置在所述第一基板朝向所述第二基板的一侧上。
  19. 根据权利要求18所述的显示装置，其中，所述重置部件包括重置晶体管，所述电压输出部件包括选通晶体管和跟随晶体管；
    所述第一基板上设置有发光器件和用于驱动所述发光器件发光的像素驱动电路，所述像素驱动电路包括多个显示用晶体管，所述重置晶体管、所述选通晶体管和所述跟随晶体管与所述显示用晶体管同层设置。
  20. 根据权利要求17所述的显示装置，其中，所述显示面板包括相对设置的第一基板和第二基板，所述指纹检测测电路设置在所述第二基板背离所述第一基板的一侧上。
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