WO2022052060A1 - 指纹识别面板及显示装置 - Google Patents

指纹识别面板及显示装置 Download PDF

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Publication number
WO2022052060A1
WO2022052060A1 PCT/CN2020/114883 CN2020114883W WO2022052060A1 WO 2022052060 A1 WO2022052060 A1 WO 2022052060A1 CN 2020114883 W CN2020114883 W CN 2020114883W WO 2022052060 A1 WO2022052060 A1 WO 2022052060A1
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WIPO (PCT)
Prior art keywords
fingerprint identification
reset
reference voltage
row
signal
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PCT/CN2020/114883
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English (en)
French (fr)
Inventor
刘屹
王世君
穆文凯
冯博
樊君
杨心澜
王洋
魏旃
丁腾飞
王迎姿
Original Assignee
京东方科技集团股份有限公司
北京京东方显示技术有限公司
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Application filed by 京东方科技集团股份有限公司, 北京京东方显示技术有限公司 filed Critical 京东方科技集团股份有限公司
Priority to PCT/CN2020/114883 priority Critical patent/WO2022052060A1/zh
Priority to CN202080001909.2A priority patent/CN114730502A/zh
Priority to US17/414,034 priority patent/US11790688B2/en
Publication of WO2022052060A1 publication Critical patent/WO2022052060A1/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

Definitions

  • the present disclosure relates to the field of touch technology, and in particular, to a fingerprint identification panel and a display device.
  • fingerprint recognition technology mainly uses photoelectric sensors to collect fingerprint images.
  • signal-to-noise ratio of fingerprint identification is large in the prior art.
  • Embodiments of the present disclosure provide a fingerprint identification panel and a display device, and the specific solutions are as follows:
  • a fingerprint identification panel provided by an embodiment of the present disclosure includes a plurality of fingerprint identification circuits arranged in a matrix, a plurality of reading signal lines, a gate driving circuit, and a plurality of scanning lines connected to the gate driving circuit;
  • the fingerprint identification circuit includes a reset module, a photoelectric conversion module, a driving transistor and a reading control module;
  • the gate driving circuit is used for sequentially outputting scan signals to the plurality of scan lines;
  • the reset module is respectively connected with the reset control terminal, the reset signal terminal and the gate of the driving transistor, and is used for providing the signal of the reset signal terminal to the reset control terminal under the control of the reset control terminal.
  • the gate of the driving transistor the photoelectric conversion module is connected to the gate of the driving transistor for converting optical signals into electrical signals;
  • the source of the driving transistor is connected to the reference voltage terminal, and the The drain is connected to the read control module, and is used for outputting a signal to the read control module under the control of its gate potential;
  • the read control module is respectively connected to the read control end, the signal output end and the The drain of the driving transistor is connected to provide the signal outputted by the driving transistor to the signal output terminal under the control of the read control terminal;
  • Each row of the fingerprint identification circuit is respectively connected to two different scan lines, wherein the read control end of the read control module is connected to the first scan line, and the reset control end of the reset module is connected to the second scan line;
  • the signal output ends of the fingerprint identification circuits in the same column are respectively connected to one of the read signal lines;
  • the first scan line correspondingly connected to the fingerprint identification circuit in the nth row and the second scan line correspondingly connected to the fingerprint identification circuit in the nth row are the same scan line; or, the nth row correspondingly connected to the fingerprint identification circuit
  • the second scan line and the first scan line corresponding to the nth row of the fingerprint identification circuit are the same scan line; n is a positive integer greater than 1 and less than or equal to N; N is the total number of lines of the fingerprint identification circuit, and greater than 1; m is a positive integer less than n.
  • m 1.
  • the read control module includes a first switch transistor
  • the first pole of the first switch transistor is connected to the drain of the driving transistor; the gate of the first switch transistor is connected to the read control terminal; the second pole of the first switch transistor connected to the signal output terminal.
  • the photoelectric conversion module includes a capacitor and a photodiode, wherein the cathode of the photodiode is connected to the gate of the driving transistor, and the capacitor is connected in parallel with the photodiode.
  • the reset module includes a second switch transistor; wherein, a first pole of the second switch transistor is connected to the reset signal terminal, and a second pole of the second switch transistor is connected to the drive transistor.
  • the gate is connected; the gate of the second switching transistor is connected with the reset control terminal.
  • the fingerprint identification panel further includes a plurality of reset signal lines and a plurality of reference voltage lines;
  • the reset signal terminal of the fingerprint identification circuit in each row or the reset signal terminal of the fingerprint identification circuit in each column is respectively connected to one of the reset signal lines;
  • the reference voltage terminals of the fingerprint identification circuits in each row or the reference voltage terminals of the fingerprint identification circuits in each column are respectively connected to one of the reference voltage lines.
  • the reset signal terminals of the fingerprint identification circuits in each row are respectively connected to one of the reset signal lines;
  • Both the reset signal line and the scan line extend in the row direction
  • the reset signal line and the scan line are set to the same layer and the same material.
  • the reset signal terminals of the fingerprint identification circuits in each column are respectively connected to one of the reset signal lines;
  • Both the reset signal line and the read signal line extend in a column direction
  • the reset signal line and the read signal line are set to the same layer and the same material.
  • the reference voltage terminals of the fingerprint identification circuits in each row are respectively connected to one of the reference voltage lines;
  • Both the reference voltage line and the scan line extend in the row direction
  • the reference voltage line and the scan line are set to the same layer and the same material.
  • the reference voltage terminals of the fingerprint identification circuits in each column are respectively connected to one of the reference voltage lines;
  • Both the reference voltage line and the read signal line extend in a column direction
  • the reference voltage line and the read signal line are set to the same layer and the same material.
  • the present disclosure also provides a display device including any one of the above fingerprint recognition panels.
  • FIG. 1 is a schematic diagram of a cascade of fingerprint identification circuits in the related art
  • Fig. 2 is a timing chart corresponding to the fingerprint identification circuit shown in Fig. 1;
  • FIG. 3 is one of the schematic structural diagrams of a fingerprint identification panel provided by an embodiment of the present disclosure
  • FIG. 4 is a second schematic structural diagram of a fingerprint identification panel provided by an embodiment of the present disclosure.
  • FIG 5 is one of the schematic diagrams of the cascade structure of the fingerprint identification circuit in the fingerprint identification panel provided by the embodiment of the present disclosure
  • FIG. 6 is the second schematic diagram of the cascade structure of the fingerprint identification circuit in the fingerprint identification panel provided by the embodiment of the present disclosure.
  • FIG. 7 is a timing diagram corresponding to the fingerprint identification panel shown in FIG. 5;
  • FIG. 8 is a timing diagram corresponding to the fingerprint identification panel shown in FIG. 6;
  • FIG. 9 is a schematic structural diagram of a fingerprint identification circuit in a fingerprint identification panel provided by an embodiment of the present disclosure.
  • FIG. 10 is a third schematic structural diagram of a fingerprint identification panel provided by an embodiment of the present disclosure.
  • FIG. 11 is a fourth schematic structural diagram of a fingerprint identification panel provided by an embodiment of the present disclosure.
  • FIG. 12 is a fifth schematic structural diagram of a fingerprint identification panel provided by an embodiment of the present disclosure.
  • FIG. 13 is a sixth schematic structural diagram of a fingerprint identification panel according to an embodiment of the present disclosure.
  • the fingerprint identification panel includes a multi-row fingerprint identification circuit 10
  • the fingerprint identification circuit 10 includes a reading control module 11 , a photoelectric conversion module 12 , a driving transistor TQ and a reset module 13 .
  • the control terminals of the reset modules 13 of all fingerprint identification circuits U are connected to the same reset control line RSTL, and the control terminals of the read control module 11 of the fingerprint identification circuit 10 in the nth row are connected to a read control scan line SW(n).
  • n is a positive integer less than or equal to the total number of lines of the fingerprint identification panel.
  • the reset control RSTL controls the reset modules 13 of all fingerprint identification circuits 10 to reset the gate potentials of the driving transistors.
  • the reading control module 11 of the fingerprint identification circuit 10 is controlled row by row to output a signal corresponding to the output of the driving transistor TQ.
  • the magnitude of the signal output by the driving transistor TQ in the fingerprint recognition circuit 10 is determined by its gate potential, and the gate potential of the driving transistor is determined by the photoelectric conversion module.
  • the present disclosure provides a fingerprint identification panel and a display device to solve the problem that the difference in brightness and clarity of the collected fingerprint image affects the identification capability of the fingerprint identification chip.
  • n is a positive integer greater than 1 and less than or equal to N
  • N is the total number of rows of the fingerprint identification circuit and greater than 1
  • k is a positive integer less than or equal to the total number of columns of the fingerprint identification circuit.
  • the gate driving circuit 1 is used for sequentially outputting scan signals to the plurality of scan lines SM(n).
  • the reset module 03 is respectively connected with the reset control terminal RST(n), the reset signal terminal VIN(n,k) and the gate of the drive transistor TQ, for Under the control of the reset control terminal RST(n), the signal of the reset signal terminal VIN(n,k) is provided to the gate TQ of the driving transistor; the photoelectric conversion module 02 and the driving transistor TQ
  • the gate of the TQ is connected to the bias voltage terminal VSS for converting the optical signal into an electrical signal;
  • the source of the driving transistor TQ is connected to the reference voltage terminal VDD(n, k), and the drain of the driving transistor TQ is connected to the reference voltage terminal VDD(n, k).
  • the reading control module 01 is connected to output a signal to the reading control module 01 under the control of its gate potential; the reading control module 01 is respectively connected with the reading control terminal SW(n), the signal output The terminal SOUT(n, k) is connected with the drain of the driving transistor TQ, and is used for providing the signal outputted by the driving transistor TQ to the signal output terminal under the control of the reading control terminal 01 .
  • the fingerprint identification circuits U(n, k) in each row are respectively connected to two different scan lines SM, and the signal output terminals SOUT(n, k) of the fingerprint identification circuits in the same column are respectively connected to one of the read signals.
  • Line OUT(k). 5 and 6 the read control terminal SW(n) of the read control module 01 is connected to the first scan line, and the reset control terminal RST(n) of the reset module 03 is connected to the second scan line connect.
  • the second scan line corresponding to the reset control terminal RST(n) of the fingerprint identification circuit U(n,k) in the nth row is connected to the fingerprint identification circuit in the n-1th row.
  • the first scan line correspondingly connected to the read control end SW(n-1) of U(n-1,k) is the same scan line SM(n).
  • the corresponding timing diagram is shown in FIG. 7 , in the reset stage, the gate driving circuit sequentially sends the scan lines SM(1), SM(2), . . . , SM(n), SM(n+1) , SM(n+2), ..., SM(N+1) to output scan signal.
  • the reset module 03 of the fingerprint identification circuit U(n,k) in the nth row performs the operation on the drive transistor TQ under the control of the scan line SM(n). reset.
  • the gate driving circuit 100 sequentially sends the scanning lines SM(1), SM(2)...SM(n), SM(n+1), SM(n+2)... SM(N+1) outputs a scan signal.
  • the reading control module 01 of the fingerprint identification circuit U(n,k) in the nth row sends the signal under the control of the scan line SM(n).
  • the output terminal SOUT(n) outputs a signal.
  • each row of the fingerprint identification circuits is respectively connected to two different scan lines, wherein the reset control terminal of each row of the fingerprint identification circuits is connected to a corresponding one of the first scan lines.
  • the reset control terminal of each row of fingerprint identification circuits is connected to a corresponding one of the first scan lines.
  • the read control terminal of each row of fingerprint identification circuits is correspondingly connected to a first scan line. Therefore, the reset control modules in each row of fingerprint identification circuits in the fingerprint identification panel are in a cascade relationship, and the read control modules in each row of fingerprint identification circuits are in a cascade relationship.
  • the exposure time of the fingerprint identification circuits of each row of the fingerprint identification panel is the same, which ensures that the brightness and definition of the fingerprint images collected in each row are consistent.
  • the first scan line corresponding to the read control terminal SW(n) of the fingerprint identification circuit U(n,k) in the nth row is connected to the fingerprint identification circuit in the n-1th row
  • the second scan line correspondingly connected to the reset control terminal RST(n-1) of U(n-1,k) is the same scan line SM(n).
  • the corresponding timing diagram is shown in FIG. 8 .
  • the gate driving circuit sequentially sends the scan lines SM(1), SM(2), . . . , SM(n-1), SM(n) , SM(n+1), ..., SM(N+1) to output scanning signals.
  • the corresponding timing diagram is shown in FIG.
  • the gate drive circuit 100 when the gate drive circuit 100 outputs a scan signal to the scan line SM(n+1), the reset module 03 of the fingerprint identification circuit U(n,k) in the nth row is in The drive transistor TQ is reset under the control of the scan line SM(n).
  • the gate driving circuit sequentially sends the scan lines SM(1), SM(2), . . . , SM(n-1), SM(n), SM(n+1), «, SM(N+1) output scan signal.
  • the read control module 01 of the fingerprint identification circuit U(n,k) in the nth row When the gate driving circuit 100 outputs a scan signal to the scan line SM(n), the read control module 01 of the fingerprint identification circuit U(n,k) in the nth row outputs the signal to the scan line SM(n) under the control of the scan line SM(n). Terminal SOUT(n) output signal.
  • each row of the fingerprint identification circuits is respectively connected to two different scan lines, wherein the reset control terminal of each row of the fingerprint identification circuits is connected to a corresponding one of the first scan lines.
  • the reset control terminal of each row of fingerprint identification circuits is connected to a corresponding one of the first scan lines.
  • the read control terminal of each row of fingerprint identification circuits is correspondingly connected to a first scan line. Therefore, the reset control modules in each row of fingerprint identification circuits in the fingerprint identification panel are in a cascade relationship, and the read control modules in each row of fingerprint identification circuits are in a cascade relationship.
  • the exposure time of the fingerprint identification circuits of each row of the fingerprint identification panel is the same, which ensures that the brightness and definition of the fingerprint images collected in each row are consistent.
  • m can be any integer greater than 1 and less than N.
  • the larger m is, the more rows need to be spanned when cascading, and the more scan lines are required at the same time. Therefore, in the fingerprint identification panel provided by the embodiments of the present disclosure, the smaller the value of m, the simpler the overall structure of the fingerprint identification panel.
  • each row of fingerprint identification circuits is cascaded with the fingerprint identification circuits of its adjacent row.
  • the number of scan lines required is only one more line than the number of lines of the fingerprint identification circuit. Therefore, the overall structure of the fingerprint identification panel is as simple as possible.
  • the reading control module 01 includes a first switch transistor T1 .
  • the first pole of the first switching transistor T1 is connected to the drain of the driving transistor TQ; the gate of the first switching transistor T1 is connected to the reading control terminal SW(n); The second pole of a switching transistor is connected to the signal output terminal SOUT(n).
  • the first switch transistor T1 when the first scan line provides a scan signal, the first switch transistor T1 is turned on, so that the fingerprint identification circuit U(n, k) outputs the electrical signal of the fingerprint image to the signal Output SOUT(n).
  • the circuit is simplified and the production cost is reduced.
  • the photoelectric conversion module 02 includes a capacitor C and a photodiode L, wherein the capacitor C and the photodiode L are connected in parallel, and the The cathode of the photodiode L is connected to the gate of the driving transistor TQ, and the anode of the photodiode L is connected to the bias voltage terminal VSS.
  • the reset module 03 when the reset module 03 is reset under the control of the second scan line, the capacitor C is charged. After that, the reset module 03 stops resetting, the capacitor C discharges, and the photodiode L is driven.
  • the light intensity of the optical signal obtained by the fingerprint identification panel at each fingerprint identification circuit is different, and the photodiode L is in the light of different light intensities. Under the influence of the signal, its resistance changes, which in turn affects the current of the loop between the capacitor C and the photodiode L to change.
  • the drain current of the driving transistor TQ has a corresponding relationship with the gate current, the current in the loop of the capacitor C and the photodiode L finally affects the drain current of the driving transistor TQ, so that The drain current is input into the reading control module 01 as a fingerprint image signal.
  • the fingerprint identification panel converts optical signals into electrical signals, which is convenient for subsequent circuits to process the signals.
  • the reset module 03 includes a second switch transistor T2; wherein the second pole of the second switch transistor T2 is connected to the drive transistor TQ The gate of the second switching transistor T2 is connected to the reset control terminal RST(n).
  • the second switch transistor T2 when the reset control terminal RST(n) connected to the gate of the second switch transistor provides a scan signal, the second switch transistor T2 is turned on, and the fingerprint identification circuit U(n,k) Perform reset; when the reset control terminal RST(n) removes the scan signal, the second switch transistor T2 is turned off, and the fingerprint identification circuit U(n,k) stops resetting. In this way, by using one switching transistor as the reset module, the circuit is simplified and the production cost is reduced.
  • it also includes a plurality of reset signal lines and a plurality of reference voltage lines;
  • the reset signal terminal of the fingerprint identification circuit in each row or the reset signal terminal of the fingerprint identification circuit in each column is respectively connected to one of the reset signal lines;
  • the reference voltage terminals of the fingerprint identification circuits in each row or the reference voltage terminals of the fingerprint identification circuits in each column are respectively connected to one of the reference voltage lines.
  • the structure of the fingerprint identification panel shown in FIG. 4 will be used as an example for description below, but it is not limited thereto.
  • the reset signal terminals VIN(n,k) of the fingerprint identification circuits U(n,k) in each row are respectively connected to one of the reset signal lines VINL(n);
  • Both the reset signal line VINL and the scan line SM extend along the row direction;
  • the reset signal line VINL and the scan line SM are made of the same layer and the same material.
  • the same reset signal line is connected through the reset signal terminals of the fingerprint identification circuits in the same line, and the reset signal line and the scan line are set to the same layer and the same material, which simplifies the operation of the fingerprint identification panel.
  • the structure simplifies the production process and reduces the manufacturing cost.
  • the reset signal terminals VIN(n,k) of the fingerprint identification circuits U(n,k) in each column are respectively connected to one of the reset signal lines VINL(k);
  • the reset signal line VINL and the read signal line OUT are set to the same layer and the same material.
  • the reset signal terminal of the fingerprint identification circuit in the same column is connected to the same reset signal line, and the reset signal line and the scan line are set to the same layer and the same material, which simplifies the operation of the fingerprint identification panel.
  • the structure simplifies the production process and reduces the manufacturing cost.
  • the reference voltage terminals VDD(n,k) of the fingerprint identification circuits U(n,k) in each row are respectively connected to one of the reference voltage lines VDDL(n);
  • Both the reference voltage line VDDL and the scan line SM extend along the row direction;
  • the reference voltage line VDDL and the scan line SM are set to the same layer and the same material.
  • the same reference voltage line is connected to the reference voltage terminal of the fingerprint identification circuit in the same line, and the reference voltage line and the scanning line are set to the same layer and the same material, which simplifies the fingerprint identification panel.
  • the structure simplifies the production process and reduces the manufacturing cost.
  • the reference voltage terminals VDD(n,k) of the fingerprint identification circuits U(n,k) in each column are respectively connected to one of the reference voltage lines VDDL(k);
  • the reference voltage line VDDL and the read signal line OUT are set to the same layer and the same material.
  • the reference voltage terminal of the fingerprint identification circuit in the same column is connected to the same reference voltage line, and the reference voltage line and the scanning line are set to the same layer and the same material, which simplifies the operation of the fingerprint identification panel.
  • the structure simplifies the production process and reduces the manufacturing cost.
  • an embodiment of the present disclosure further provides a display device, including any one of the above-mentioned fingerprint identification panels provided by the embodiment of the present disclosure.
  • the display device can be any product or component with a display function, such as a mobile phone, a tablet computer, and a notebook computer.
  • a display function such as a mobile phone, a tablet computer, and a notebook computer.
  • An embodiment of the present disclosure provides a fingerprint identification panel and a display device.
  • the wires are connected to form a cascade structure.
  • the reset modules and reading control modules of all the fingerprint identification circuits work row by row, so that all the fingerprint recognition circuits work row by row.
  • the fingerprint identification panel has the same exposure time for the fingerprint images of each row, so that all the fingerprint identification circuits have the same exposure time to the fingerprint images, thereby improving the uniformity of the brightness and clarity of the fingerprint signal, which is beneficial to the fingerprint identification chip. Signals are identified more quickly and accurately.

Abstract

一种指纹识别面板及显示装置，包括呈矩阵排列的多个指纹识别电路（U（n，k））、多条读取信号线（OUT（k））、栅极驱动电路（100）以及与所述栅极驱动电路（100）连接的多条扫描线（SM（n））；所述栅极驱动电路（100）用于向所述扫描线（SM（n））依次输出扫描信号；每个所述指纹识别电路（U（n，k））分别对应连接两条不同的扫描线，所述指纹识别电路（U（n，k））的读取控制端（SW（n））与第一扫描线连接，指纹识别电路（U（n，k））的复位控制端（RST（n））与第二扫描线连接；第n行所述指纹识别电路（U（n，k））对应连接的第一扫描线与第n-m行所述指纹识别电路（U（n-m，k））对应连接的第二扫描线为同一扫描线；或第n行所述指纹识别电路（U（n，k））对应连接的第二扫描线与第n-m行指纹识别电路（U（n-m，k））对应连接的第一扫描线为同一扫描线；n、m为正整数；N为所述指纹识别电路（U（n，k））总行数；1＜n≤N，m＜n。

Description

指纹识别面板及显示装置 技术领域
本公开涉及触控技术领域，尤指一种指纹识别面板及显示装置。
背景技术
近年来，随着触控技术的高速发展，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。
目前，指纹识别技术主要是利用光电传感器进行指纹图像的采集。但是现有技术中存在指纹识别的信噪比较大的问题。
发明内容
本公开实施例提供一种指纹识别面板及显示装置，具体方案如下：
本公开实施例提供的一种指纹识别面板，包括呈矩阵排列的多个指纹识别电路、多条读取信号线、栅极驱动电路以及与所述栅极驱动电路连接的多条扫描线；所述指纹识别电路包括复位模块、光电转换模块、驱动晶体管和读取控制模块；
所述栅极驱动电路用于向所述多条扫描线依次输出扫描信号；
所述指纹识别电路中，所述复位模块分别与复位控制端、复位信号端以及所述驱动晶体管的栅极连接，用于在所述复位控制端的控制下将所述复位信号端的信号提供给所述驱动晶体管的栅极；所述光电转换模块与所述驱动晶体管的栅极连接，用于将光信号转换为电信号；所述驱动晶体管的源极与参考电压端连接，所述驱动晶体管的漏极与所述读取控制模块连接，用于在其栅极电位的控制下向所述读取控制模块输出信号；所述读取控制模块分别与读取控制端、信号输出端以及所述驱动晶体管的漏极连接，用于在所述读 取控制端的控制下将所述驱动晶体管输出的信号提供给所述信号输出端；
每一行所述指纹识别电路分别对应连接两条不同的扫描线，其中，所述读取控制模块的读取控制端与第一扫描线连接，复位模块的复位控制端与第二扫描线连接；同列的所述指纹识别电路的信号输出端分别对应连接一条所述读取信号线；
第n行所述指纹识别电路对应连接的第一扫描线与第n-m行所述指纹识别电路对应连接的第二扫描线为同一扫描线；或者，第n行所述指纹识别电路对应连接的第二扫描线与第n-m行指纹识别电路对应连接的第一扫描线为同一扫描线；n为大于1，且小于等于N的正整数；N为所述指纹识别电路总行数，且大于1；m为小于n的正整数。
可选地，在所述的指纹识别面板中，m＝1。
可选地，所述读取控制模块包括第一开关晶体管；
其中，所述第一开关晶体管的第一极与所述驱动晶体管的漏极连接；所述第一开关晶体管的栅极与所述读取控制端连接；所述第一开关晶体管的第二极与所述信号输出端连接。
可选地，所述光电转换模块包括电容与光电二极管，其中，所述光电二极管的阴极与所述驱动晶体管的栅极连接，所述电容与所述光电二极管并联连接。
可选地，所述复位模块包括第二开关晶体管；其中，所述第二开关晶体管的第一极与所述复位信号端连接，所述第二开关晶体管的第二极与所述驱动晶体管的栅极连接；所述第二开关晶体管的栅极与所述复位控制端连接。
可选地，所述的指纹识别面板中，还包括多条复位信号线和多条参考电压线；
每一行所述指纹识别电路的复位信号端或者每一列所述指纹识别电路的复位信号端分别对应连接一条所述复位信号线；
每一行所述指纹识别电路的参考电压端或者每一列所述指纹识别电路的参考电压端分别对应连接一条所述参考电压线。
可选地，每一行所述指纹识别电路的复位信号端分别对应连接一条所述复位信号线；
所述复位信号线和所述扫描线均沿行方向延伸；
所述复位信号线和所述扫描线设置为同层同材质。
可选地，每一列所述指纹识别电路的复位信号端分别对应连接一条所述复位信号线；
所述复位信号线和所述读取信号线均沿列方向延伸；
所述复位信号线和所述读取信号线设置为同层同材质。
可选地，每一行所述指纹识别电路的参考电压端分别对应连接一条所述参考电压线；
所述参考电压线和所述扫描线均沿行方向延伸；
所述参考电压线和所述扫描线设置为同层同材质。
可选地，每一列所述指纹识别电路的参考电压端分别对应连接一条所述参考电压线；
所述参考电压线和所述读取信号线均沿列方向延伸；
所述参考电压线和所述读取信号线设置为同层同材质。
相应地，本公开还提供了一种包括上述任一种的指纹识别面板的显示装置。
附图说明
图1为相关技术中的指纹识别电路的级联示意图；
图2为图1所示指纹识别电路对应的时序图；
图3为本公开实施例提供的指纹识别面板的结构示意图之一；
图4为本公开实施例提供的指纹识别面板的结构示意图之二；
图5为本公开实施例提供的指纹识别面板中指纹识别电路的级联结构示意图之一；
图6为本公开实施例提供的指纹识别面板中指纹识别电路的级联结构示 意图之二；
图7为图5所示的指纹识别面板对应的时序图；
图8为图6所示的指纹识别面板对应的时序图；
图9为本公开实施例提供的指纹识别面板中指纹识别电路的结构示意图；
图10为本公开实施例提供的指纹识别面板结构示意图之三；
图11为本公开实施例提供的指纹识别面板结构示意图之四；
图12为本公开实施例提供的指纹识别面板结构示意图之五；
图13为本公开实施例提供的指纹识别面板结构示意图之六。
具体实施方式
相关技术中，如图1所示，指纹识别面板中包括多行指纹识别电路10，指纹识别电路10包括读取控制模块11、光电转换模块12、驱动晶体管TQ和复位模块13。所有指纹识别电路U的复位模块13的控制端均与同一复位控制线RSTL连接，第n行指纹识别电路10的读取控制模块11的控制端对应连接一条读取控制扫描线SW(n)。其中n为小于等于所述指纹识别面板的总行数的正整数。指纹识别面板在工作时，对应的时序图如图2所示，在复位阶段，复位控制RSTL控制所有指纹识别电路10的复位模块13以对驱动晶体管的栅极电位进行复位。在信号读取阶段，在读取控制扫描线SW(n)的控制下，逐行控制指纹识别电路10的读取控制模块11输出对应驱动晶体管TQ输出的信号。其中，指纹识别电路10中驱动晶体管TQ输出的信号的大小由其栅极电位决定，而驱动晶体管的栅极电位由光电转换模块决定，当指纹触手指触控指纹识别面板时，指纹的谷和脊对光的遮挡程度不同，导致光电转换模块转换的电信号的大小不同，进而导致驱动晶体管的栅极电位不同。
但是在上述指纹识别面板中，由于不同行指纹识别电路中光电转换模块11的曝光时间不相同，进而使采集到的指纹图像的亮度不均一，影响指纹识别的准确度。
基于此，本公开提供了一种指纹识别面板及显示装置，用以解决采集到 的指纹图像亮度与清晰度存在差异而影响指纹识别芯片的识别能力的问题。
为使本公开的上述目的、特征和优点能够更为明显易懂，下面将结合附图和实施例对本公开做进一步说明。然而，示例实施方式能够以多种形式实施，且不应被理解为限于在此阐述的实施方式；相反，提供这些实施方式使得本公开更全面和完整，并将示例实施方式的构思全面地传达给本领域的技术人员。在图中相同的附图标记表示相同或类似的结构，因而将省略对它们的重复描述。本公开中所描述的表达位置与方向的词，均是以附图为例进行的说明，但根据需要也可以做出改变，所做改变均包含在本公开保护范围内。本公开的附图仅用于示意相对位置关系不代表真实比例。
需要说明的是，在以下描述中阐述了具体细节以便于充分理解本公开。但是本公开能够以多种不同于在此描述的其它方式来实施，本领域技术人员可以在不违背本公开内涵的情况下做类似推广。因此本公开不受下面公开的具体实施方式的限制。说明书后续描述为实施本申请的较佳实施方式，然所述描述乃以说明本申请的一般原则为目的，并非用以限定本申请的范围。本申请的保护范围当视所附权利要求所界定者为准。
下面结合附图，对本公开实施例提供的指纹识别面板及显示装置进行具体说明。
本公开实施例提供的一种指纹识别面板，以m＝1的情况为例，如图3至图6所示，包括呈矩阵排列的多个指纹识别电路U(n,k)(其中n为所述指纹识别电路的行序号，k为所述指纹识别电路的列序号)、多条读取信号线OUT(k)、栅极驱动电路100以及与所述栅极驱动电路100连接的多条扫描线SM(n)；所述指纹识别电路U包括复位模块03、光电转换模块02、驱动晶体管TQ和读取控制模块01。其中；n为大于1，且小于等于N的正整数；N为所述指纹识别电路总行数，且大于1；k为小于等于所述指纹识别电路总列数的正整数。
所述栅极驱动电路1用于向所述多条扫描线SM(n)依次输出扫描信号。
所述指纹识别电路U(n,k)中，所述复位模块03分别与复位控制端RST(n)、 复位信号端VIN(n,k)以及所述驱动晶体管TQ的栅极连接，用于在所述复位控制端RST(n)的控制下将所述复位信号端VIN(n,k)的信号提供给所述驱动晶体管的栅极TQ；所述光电转换模块02与所述驱动晶体管TQ的栅极和偏置电压端VSS连接，用于将光信号转换为电信号；所述驱动晶体管TQ的源极与参考电压端VDD(n,k)连接，所述驱动晶体管TQ的漏极与所述读取控制模块01连接，用于在其栅极电位的控制下向所述读取控制模块01输出信号；所述读取控制模块01分别与读取控制端SW(n)、信号输出端SOUT(n,k)以及所述驱动晶体管TQ的漏极连接，用于在所述读取控制端01的控制下将所述驱动晶体管TQ输出的信号提供给所述信号输出端。
每一行所述指纹识别电路U(n,k)分别对应连接两条不同的扫描线SM，同列的所述指纹识别电路的信号输出端SOUT(n,k)分别对应连接一条所述读取信号线OUT(k)。其中，如图5和图6所示，所述读取控制模块01的读取控制端SW(n)与第一扫描线连接，复位模块03的复位控制端RST(n)与第二扫描线连接。
具体地，如图3和图5所示，第n行所述指纹识别电路U(n,k)的复位控制端RST(n)对应连接的第二扫描线与第n-1行指纹识别电路U(n-1,k)的读取控制端SW(n-1)对应连接的第一扫描线为同一个扫描线SM(n)。对应的时序图如图7所示，在复位阶段，所述栅极驱动电路依次向所述扫描线SM(1)、SM(2)、……、SM(n)、SM(n+1)、SM(n+2)、……、SM(N+1)输出扫描信号。当栅极驱动电路100向扫描线SM(n)输出扫描信号时，第n行的指纹识别电路U(n,k)的复位模块03在扫描线SM(n)的控制下对驱动晶体管TQ进行复位。在信号读取阶段，所述栅极驱动电路100依次向所述扫描线SM(1)、SM(2)……SM(n)、SM(n+1)、SM(n+2)……SM(N+1)输出扫描信号。当栅极驱动电路向扫描线SM(n+1)输出扫描信号时，第n行的指纹识别电路U(n,k)的读取控制模块01在扫描线SM(n)的控制下向信号输出端SOUT(n)输出信号。
这样，在本发申请实施例提供的上述所述指纹识别面板中，每一行所述指纹识别电路分别对应连接两条不同的扫描线，其中，每一行指纹识别电路 的复位控制端对应连接一条第二扫描线，每一行指纹识别电路的读取控制端对应连接一条第一扫描线。从而使指纹识别面板中各行指纹识别电路中复位控制模块呈级联关系，各行指纹识别电路中读取控制模块呈级联关系。这样所述指纹识别面板的各行指纹识别电路的曝光时间相同，保证了各行采集到的指纹图像亮度与清晰度一致。并且，将第n行所述指纹识别电路的复位控制端对应连接的第二扫描线与第n-1行指纹识别电路的读取控制端对应连接的第一扫描线设置为同一个扫描线，这样仅需采用一个栅极驱动电路就可以实现复位和读取，不用额外增加栅极驱动电路，从而有利于窄边框设计。
或者，如图4和图6所示，第n行所述指纹识别电路U(n,k)的读取控制端SW(n)对应连接的第一扫描线与第n-1行指纹识别电路U(n-1,k)的复位控制端RST(n-1)对应连接的第二扫描线为同一个扫描线SM(n)。对应的时序图如图8所示，在复位阶段，所述栅极驱动电路依次向所述扫描线SM(1)、SM(2)、……、SM(n-1)、SM(n)、SM(n+1)、……、SM(N+1)输出扫描信号。对应的时序图如图8所示，那么，当栅极驱动电路100向扫描线SM(n+1)输出扫描信号时，第n行的指纹识别电路U(n,k)的复位模块03在扫描线SM(n)的控制下对所述驱动晶体管TQ进行复位。在信号读取阶段，所述栅极驱动电路依次向所述扫描线SM(1)、SM(2)、……、SM(n-1)、SM(n)、SM(n+1)、……、SM(N+1)输出扫描信号。当栅极驱动电路100向扫描线SM(n)输出扫描信号时，第n行的指纹识别电路U(n,k)的读取控制模块01在扫描线SM(n)的控制下向信号输出端SOUT(n)输出信号。
这样，在本发申请实施例提供的上述所述指纹识别面板中，每一行所述指纹识别电路分别对应连接两条不同的扫描线，其中，每一行指纹识别电路的复位控制端对应连接一条第二扫描线，每一行指纹识别电路的读取控制端对应连接一条第一扫描线。从而使指纹识别面板中各行指纹识别电路中复位控制模块呈级联关系，各行指纹识别电路中读取控制模块呈级联关系。这样所述指纹识别面板的各行指纹识别电路的曝光时间相同，保证了各行采集到的指纹图像亮度与清晰度一致。并且，将第n行所述指纹识别电路的读取控 制端对应连接的第一扫描线与第n-1行指纹识别电路的复位控制端对应连接的第二扫描线设置为同一个扫描线，这样仅需采用一个栅极驱动电路就可以实现复位和读取，不用额外增加栅极驱动电路，从而有利于窄边框设计。
需要说明的是，本申请中，图4至图6均是以m＝1为例进行示意说明的。在具体实施时，m可以为大于1小于N的任意整数。但是，m越大，级联时需要跨越的行数越多，同时需要的扫描线的数量也越多。因此，本公开实施例提供的指纹识别面板中，m取值越小，指纹识别面板整体结构越简单。
可选地，本公开实施例提供的指纹识别面板中，m＝1。这样每一行指纹识别电路均是与其相邻行的指纹识别电路进行级联。并且，需要的扫描线数量仅比指纹识别电路的行数多一行。从而使指纹识别面板整体结构尽可能简单。
可选地，在本申请的指纹识别面板中，如图9所示，所述读取控制模块01包括第一开关晶体管T1。其中，所述第一开关晶体管T1的第一极与所述驱动晶体管TQ的漏极连接；所述第一开关晶体管T1的栅极与所述读取控制端SW(n)连接；所述第一开关晶体管的第二极连接至信号输出端SOUT(n)。
具体地，在信号读取阶段，当所述第一扫描线提供扫描信号时，所述第一开关晶体管T1打开，使所述指纹识别电路U(n,k)输出指纹图像的电信号至信号输出端SOUT(n)。这样，通过一个开关晶体管作为所述读取控制模块，简化了电路，降低了生产成本。
可选地，在本申请的指纹识别面板中，如图9所示，所述光电转换模块02包括电容C与光电二极管L，其中，所述电容C与所述光电二极管L并联连接，所述光电二极管L的阴极与所述驱动晶体管TQ的栅极连接，所述光电二极管L的阳极与所述偏置电压端VSS连接。
具体地，当所述复位模块03在第二扫描线控制下复位时，所述电容C充电。之后复位模块03停止复位，所述电容C放电，驱动所述光电二极管L。当手指按压在所述指纹识别面板上时，由于手指的指纹高低不平，所述指纹识别面板在各个指纹识别电路处得到的光信号的光强不同，所述光电二极管L 在不同光强的光信号的影响下其电阻发生变化，进而影响所述电容C与所述光电二极管L的回路的电流发生变化。由于所述驱动晶体管TQ的漏极电流与栅极电流呈对应相关的关系，那么所述电容C与所述光电二极管L的回路的电流，最终影响了所述驱动晶体管TQ的漏极电流，使漏极电流作为指纹图像信号输入至所述读取控制模块01中。这样，所述指纹识别面板将光信号转化为电信号，便于后续电路对信号进行处理。
可选地，在本申请的指纹识别面板中，如图9所示，所述复位模块03包括第二开关晶体管T2；其中，所述第二开关晶体管T2的第二极与所述驱动晶体管TQ的栅极连接；所述第二开关晶体管T2的栅极与所述复位控制端RST(n)连接。
具体地，当与所述第二开关晶体管的栅极连接的所述复位控制端RST(n)提供扫描信号时，所述第二开关晶体管T2打开，所述指纹识别电路U(n,k)进行复位；当复位控制端RST(n)撤去扫描信号时，所述第二开关晶体管T2关断，所述指纹识别电路U(n,k)停止复位。这样，通过一个开关晶体管作为所述复位模块，简化了电路，降低了生产成本。
可选地，还包括多条复位信号线和多条参考电压线；
每一行所述指纹识别电路的复位信号端或者每一列所述指纹识别电路的复位信号端分别对应连接一条所述复位信号线；
每一行所述指纹识别电路的参考电压端或者每一列所述指纹识别电路的参考电压端分别对应连接一条所述参考电压线。
这样，通过对所述复位信号线和所述参考电压线的复用，简化了所述指纹识别面板的结构，降低了生产制造的难度。
在本申请的指纹识别面板中，下文将以图4所示的指纹识别面板的结构为例进行说明，但不限于此。
可选地，如图10所示，每一行所述指纹识别电路U(n,k)的复位信号端VIN(n,k)分别对应连接一条所述复位信号线VINL(n)；
所述复位信号线VINL和所述扫描线SM均沿行方向延伸；
所述复位信号线VINL和所述扫描线设置SM为同层同材质。
这样，通过同行的所述指纹识别电路的复位信号端连接同一条所述复位信号线，并将所述复位信号线和所述扫描线设置为同层同材质，简化了所述指纹识别面板的结构，简化了生产工艺，降低了生产制造的成本。
可选地，如图11所示，每一列所述指纹识别电路U(n,k)的复位信号端VIN(n,k)分别对应连接一条所述复位信号线VINL(k)；
所述复位信号线VINL和所述读取信号线OUT均沿列方向延伸；
所述复位信号线VINL和所述读取信号线OUT设置为同层同材质。
这样，通过同列的所述指纹识别电路的复位信号端连接同一条所述复位信号线，并将所述复位信号线和所述扫描线设置为同层同材质，简化了所述指纹识别面板的结构，简化了生产工艺，降低了生产制造的成本。
可选地，如图12所示，每一行所述指纹识别电路U(n,k)的参考电压端VDD(n,k)分别对应连接一条所述参考电压线VDDL(n)；
所述参考电压线VDDL和所述扫描线SM均沿行方向延伸；
所述参考电压线VDDL和所述扫描线SM设置为同层同材质。
这样，通过同行的所述指纹识别电路的参考电压端连接同一条所述参考电压线，并将所述参考电压线和所述扫描线设置为同层同材质，简化了所述指纹识别面板的结构，简化了生产工艺，降低了生产制造的成本。
可选地，如图13所示，每一列所述指纹识别电路U(n,k)的参考电压端VDD(n,k)分别对应连接一条所述参考电压线VDDL(k)；
所述参考电压线VDDL和所述读取信号线OUT均沿列方向延伸；
所述参考电压线VDDL和所述读取信号线OUT设置为同层同材质。
这样，通过同列的所述指纹识别电路的参考电压端连接同一条所述参考电压线，并将所述参考电压线和所述扫描线设置为同层同材质，简化了所述指纹识别面板的结构，简化了生产工艺，降低了生产制造的成本。
基于同一发明构思，本公开实施例还提供了一种显示装置，包括本公开实施例提供的上述任一种指纹识别面板。该显示装置可以为：手机、平板电 脑、笔记本电脑等任何具有显示功能的产品或部件。该显示装置的实施可以参见上述显示面板的实施例，重复之处不再赘述。
本公开实施例提供的一种指纹识别面板及显示装置，通过将所述指纹识别面板中呈矩阵排列的指纹识别电路的复位模块与相隔若干行的指纹识别电路的读取控制模块通过同一信号扫描线连接，形成级联结构。通过在复位阶段与信号读取阶段通过面板上的栅极驱动电路逐行扫描控制所述信号扫描线，使所述所有指纹识别电路的复位模块与读取控制模块均为逐行工作，使所述指纹识别面板对各行的指纹图像曝光时间相同，使所有所述指纹识别电路对指纹图像的曝光时间相同，从而改善了指纹信号的亮度与清晰度的均一性，有利于指纹识别芯片对指纹图像信号更加快速、精准的识别。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (11)

  1. 一种指纹识别面板，其中，包括呈矩阵排列的多个指纹识别电路、多条读取信号线、栅极驱动电路以及与所述栅极驱动电路连接的多条扫描线；所述指纹识别电路包括复位模块、光电转换模块、驱动晶体管和读取控制模块；
    所述栅极驱动电路用于向所述多条扫描线依次输出扫描信号；
    所述指纹识别电路中，所述复位模块分别与复位控制端、复位信号端以及所述驱动晶体管的栅极连接，用于在所述复位控制端的控制下将所述复位信号端的信号提供给所述驱动晶体管的栅极；所述光电转换模块与所述驱动晶体管的栅极连接，用于将光信号转换为电信号；所述驱动晶体管的源极与参考电压端连接，所述驱动晶体管的漏极与所述读取控制模块连接，用于在其栅极电位的控制下向所述读取控制模块输出信号；所述读取控制模块分别与读取控制端、信号输出端以及所述驱动晶体管的漏极连接，用于在所述读取控制端的控制下将所述驱动晶体管输出的信号提供给所述信号输出端；
    每一行所述指纹识别电路分别对应连接两条不同的扫描线，其中，所述读取控制模块的读取控制端与第一扫描线连接，复位模块的复位控制端与第二扫描线连接；每一列的所述指纹识别电路的信号输出端分别对应连接一条所述读取信号线；
    第n行所述指纹识别电路对应连接的第一扫描线与第n-m行所述指纹识别电路对应连接的第二扫描线为同一扫描线；或者，第n行所述指纹识别电路对应连接的第二扫描线与第n-m行指纹识别电路对应连接的第一扫描线为同一扫描线；n为大于1，且小于等于N的正整数；N为所述指纹识别电路总行数，且大于1；m为小于n的正整数。
  2. 如权利要求1所述的指纹识别面板，其中，m＝1。
  3. 如权利要求1所述的指纹识别面板，其中，所述读取控制模块包括第一开关晶体管；其中：
    所述第一开关晶体管的第一极与所述驱动晶体管的漏极连接，所述第一开关晶体管的栅极与所述读取控制端连接，所述第一开关晶体管的第二极与所述信号输出端连接。
  4. 如权利要求1所述的指纹识别面板，其中，所述光电转换模块包括电容与光电二极管；其中：
    所述光电二极管的阴极与所述驱动晶体管的栅极连接，所述电容与所述光电二极管并联连接。
  5. 如权利要求1所述的指纹识别面板，其中，所述复位模块包括第二开关晶体管；其中：
    所述第二开关晶体管的第一极与所述复位信号端连接，所述第二开关晶体管的第二极与所述驱动晶体管的栅极连接；所述第二开关晶体管的栅极与所述复位控制端连接。
  6. 如权利要求1所述的指纹识别面板，其中，还包括多条复位信号线和多条参考电压线；
    每一行所述指纹识别电路的复位信号端或者每一列所述指纹识别电路的复位信号端分别对应连接一条所述复位信号线；
    每一行所述指纹识别电路的参考电压端或者每一列所述指纹识别电路的参考电压端分别对应连接一条所述参考电压线。
  7. 如权利要求6所述的指纹识别面板，其中，每一行所述指纹识别电路的复位信号端分别对应连接一条所述复位信号线；
    所述复位信号线和所述扫描线均沿行方向延伸；
    所述复位信号线和所述扫描线设置为同层同材质。
  8. 如权利要求6所述的指纹识别面板，其中，每一列所述指纹识别电路的复位信号端分别对应连接一条所述复位信号线；
    所述复位信号线和所述读取信号线均沿列方向延伸；
    所述复位信号线和所述读取信号线设置为同层同材质。
  9. 如权利要求6所述的指纹识别面板，其中，每一行所述指纹识别电路 的参考电压端分别对应连接一条所述参考电压线；
    所述参考电压线和所述扫描线均沿行方向延伸；
    所述参考电压线和所述扫描线设置为同层同材质。
  10. 如权利要求6所述的指纹识别面板，其中，每一列所述指纹识别电路的参考电压端分别对应连接一条所述参考电压线；
    所述参考电压线和所述读取信号线均沿列方向延伸；
    所述参考电压线和所述读取信号线设置为同层同材质。
  11. 一种显示装置，其中，包括如权利要求1-10任一项所述的指纹识别面板。
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