WO2021072666A1 - 指纹识别检测电路、方法和显示装置 - Google Patents

指纹识别检测电路、方法和显示装置 Download PDF

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Publication number
WO2021072666A1
WO2021072666A1 PCT/CN2019/111403 CN2019111403W WO2021072666A1 WO 2021072666 A1 WO2021072666 A1 WO 2021072666A1 CN 2019111403 W CN2019111403 W CN 2019111403W WO 2021072666 A1 WO2021072666 A1 WO 2021072666A1
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WIPO (PCT)
Prior art keywords
photoelectric conversion
control
conversion element
voltage
pole
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Application number
PCT/CN2019/111403
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English (en)
French (fr)
Inventor
曹学友
丁小梁
王海生
王文娟
王鹏鹏
李亚鹏
张平
邓立凯
Original Assignee
京东方科技集团股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to PCT/CN2019/111403 priority Critical patent/WO2021072666A1/zh
Priority to CN201980002016.7A priority patent/CN113196281B/zh
Priority to US16/975,638 priority patent/US11232278B2/en
Publication of WO2021072666A1 publication Critical patent/WO2021072666A1/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
    • 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 disclosure relates to the technical field of fingerprint identification, and in particular to a fingerprint identification detection circuit, method and display device.
  • Fingerprints refer to the uneven lines on the skin on the front of the end of a human finger; among them, the raised locations are called ridges and the recessed locations are called valleys. Because fingerprints have lifelong immutability, uniqueness and convenience, they have almost become synonymous with biometric identification.
  • optical fingerprint recognition is a research hotspot.
  • the light source illuminates the finger will produce different reflections, so that the intensity of the light reaching the photosensitive device changes, and different photoelectric signals are generated. According to the photoelectric signal Then the detection of fingerprint valley ridges can be realized.
  • an embodiment of the present disclosure provides a fingerprint recognition detection circuit, including a storage capacitor, a capacitor control circuit, and a photoelectric conversion element;
  • the photoelectric conversion element is configured to convert the received optical signal into a corresponding electrical signal when in a photoelectric conversion state
  • the capacitance control circuit is disposed between the storage capacitor and the photoelectric conversion element, and is configured to control the storage of at least part of the electrical signal in the storage capacitor under the control of a capacitance control signal.
  • the fingerprint identification detection circuit described in at least one embodiment of the present disclosure further includes a voltage supply circuit
  • the voltage supply circuit is configured to provide a first bias control voltage to the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a photoelectric conversion state, or to supply the first pole of the photoelectric conversion element A second bias control voltage is provided to control the photoelectric conversion element to be in a forward bias state.
  • the fingerprint identification detection circuit described in at least one embodiment of the present disclosure further includes a switch control circuit and a discharge voltage terminal, wherein:
  • the switch control circuit is configured to control the second pole of the photoelectric conversion element to be electrically connected to the discharge voltage terminal under the control of the switch control signal, so as to release the charge in the photoelectric conversion element to the discharge Voltage terminal.
  • the fingerprint identification detection circuit described in at least one embodiment of the present disclosure further includes a reset circuit
  • the reset circuit is configured to provide a reset voltage to the second pole of the photoelectric conversion element.
  • the photoelectric conversion element is a photodiode
  • a first pole of the photoelectric conversion element is an anode of the photodiode
  • a second pole of the photoelectric conversion element is a cathode of the photodiode.
  • the capacitance control circuit includes a first capacitance control transistor and a second capacitance control transistor; the capacitance control signal includes a first capacitance control signal and a second capacitance control signal;
  • the control electrode of the first capacitance control transistor is electrically connected to a first capacitance control signal line, the first electrode of the first capacitance control transistor is electrically connected to the first end of the storage capacitor, and the first capacitance control transistor is electrically connected to the first end of the storage capacitor.
  • the second pole of the photoelectric conversion element is electrically connected to the first pole of the photoelectric conversion element;
  • the control electrode of the second capacitance control transistor is electrically connected to a second capacitance control signal line, the first electrode of the second capacitance control transistor is electrically connected to the second electrode of the photoelectric conversion element, and the second capacitance control The second electrode of the transistor is electrically connected to the second end of the storage capacitor;
  • the first capacitance control signal line is used to provide the first capacitance control signal
  • the second capacitance control signal line is used to provide the second capacitance control signal
  • the voltage supply circuit includes a first voltage supply transistor and a second voltage supply transistor, wherein,
  • the control electrode of the first voltage supply transistor is electrically connected to the first voltage supply control line, the first electrode of the first voltage supply transistor is electrically connected to the first bias control voltage terminal, and the first voltage supply transistor
  • the second pole is electrically connected to the first pole of the photoelectric conversion element
  • the control electrode of the second voltage providing transistor is electrically connected to the second voltage providing control line, the first electrode of the second voltage providing transistor is electrically connected to the second bias control voltage terminal, and the second voltage providing transistor
  • the second pole is electrically connected to the first pole of the photoelectric conversion element
  • the first bias control voltage terminal is used to provide a first bias control voltage
  • the second bias control voltage terminal is used to provide a second bias control voltage
  • the voltage supply circuit includes a bias control voltage terminal and a bias control voltage supply circuit
  • the bias control voltage terminal is electrically connected to the first pole of the photoelectric conversion element, and the bias control voltage supply circuit is configured to provide a first bias control voltage or a second bias control voltage to the bias control voltage terminal. Set the control voltage.
  • the fingerprint identification detection circuit described in at least one embodiment of the present disclosure further includes a switch control circuit, an integrating operational amplifier, an integrating capacitor, and a discharge switch, wherein:
  • the switch control circuit is respectively electrically connected to the switch control terminal, the second pole of the photoelectric conversion element, and the non-inverting input terminal of the integrating operational amplifier, and is configured to control the switch control signal provided at the switch control terminal Next, controlling the on-off between the second pole of the photoelectric conversion element and the non-inverting input terminal of the integrating operational amplifier;
  • the inverting input terminal of the integrating operational amplifier is electrically connected to the reference voltage terminal;
  • the first end of the integrating capacitor is electrically connected to the non-inverting input end of the integrating operational amplifier, and the second end of the integrating capacitor is electrically connected to the output end of the integrating operational amplifier;
  • the control terminal of the discharge switch is electrically connected with the discharge control terminal, the first terminal of the discharge switch is electrically connected with the non-inverting input terminal of the integral operational amplifier, and the second terminal of the discharge switch is electrically connected with the integral operational amplifier.
  • the discharge switch is configured to control the non-inverting input terminal of the integrating operational amplifier and the output terminal of the integrating operational amplifier under the control of the discharge control signal provided by the discharge control terminal. The on-off.
  • the switch control circuit includes a switch control transistor
  • the control electrode of the switch control transistor is electrically connected to the switch control terminal, the first electrode of the switch control transistor is electrically connected to the second electrode of the photoelectric conversion element, and the second electrode of the switch control transistor is electrically connected to the integral
  • the non-inverting input terminal of the operational amplifier is electrically connected.
  • the fingerprint identification detection circuit described in at least one embodiment of the present disclosure further includes an ambient light brightness detection circuit
  • the ambient light brightness detection circuit is configured to detect the brightness of the ambient light, and control the capacitance control signal according to the brightness.
  • the embodiments of the present disclosure also provide a fingerprint identification and detection method, which is applied to the above-mentioned fingerprint identification and detection circuit, and the fingerprint identification and detection method includes:
  • the photoelectric conversion element When the photoelectric conversion element is in the photoelectric conversion state, it converts the received optical signal into the corresponding electrical signal
  • the capacitance control circuit controls to store at least part of the electrical signal in the storage capacitor under the control of the capacitance control signal.
  • the fingerprint identification and detection circuit further includes a voltage supply circuit; the fingerprint identification and detection method further includes:
  • the voltage supply circuit provides a first bias control voltage for the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a photoelectric conversion state, or the voltage supply circuit is the first pole of the photoelectric conversion element One pole provides a second bias control voltage to control the photoelectric conversion element to be in a forward bias state.
  • the fingerprint recognition detection stage when the brightness of the ambient light is greater than the predetermined brightness, the fingerprint recognition detection stage includes a reset time period, an integration time period, and a collection time period that are sequentially set; the fingerprint recognition detection method includes:
  • the capacitance control circuit controls the communication between the first terminal of the storage capacitor and the first pole of the photoelectric conversion element under the control of the capacitance control signal, and controls the first terminal of the storage capacitor The two ends are connected with the second pole of the photoelectric conversion element; a voltage supply circuit provides a first bias control voltage for the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a photoelectric conversion state;
  • the photoelectric conversion element converts the received optical signal into a corresponding electrical signal, and charges the storage capacitor through the electrical signal to change the voltage of the second electrode of the photoelectric conversion element ;
  • fingerprint recognition can be performed based on the voltage of the second pole of the photoelectric conversion element.
  • the fingerprint identification detection circuit further includes a switch control circuit and a discharge voltage terminal; the fingerprint identification detection method further includes:
  • the capacitance control circuit controls the first end of the storage capacitor to be disconnected from the first pole of the photoelectric conversion element under the control of the capacitance control signal, and controls the second end of the storage capacitor Disconnected from the second pole of the photoelectric conversion element;
  • the voltage supply circuit provides a second bias control voltage for the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a forward bias state, and the switch control circuit is in the switch control signal Under the control of, the second electrode of the photoelectric conversion element is controlled to be electrically connected to the discharge voltage terminal, so as to release the charge in the photoelectric conversion element to the discharge voltage terminal.
  • the fingerprint recognition detection stage when the brightness of the ambient light is less than or equal to the predetermined brightness, the fingerprint recognition detection stage includes a reset time period, an integration time period, and a collection time period that are sequentially set; the fingerprint recognition detection method includes:
  • the capacitance control circuit controls the first end of the storage capacitor to be disconnected from the first pole of the photoelectric conversion element under the control of the capacitance control signal, and controls the second end of the storage capacitor The two terminals are disconnected from the second pole of the photoelectric conversion element;
  • the voltage supply circuit provides a first bias control voltage for the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a photoelectric conversion state;
  • the photoelectric conversion element converts the received optical signal into a corresponding electrical signal, and charges the storage capacitor through the electrical signal to change the voltage of the second electrode of the photoelectric conversion element ;
  • fingerprint recognition can be performed based on the voltage of the second pole of the photoelectric conversion element.
  • the fingerprint identification detection circuit further includes a switch control circuit and a discharge voltage terminal; the fingerprint identification detection method further includes:
  • the capacitance control circuit controls the first end of the storage capacitor to be disconnected from the first pole of the photoelectric conversion element under the control of the capacitance control signal, and controls the second end of the storage capacitor Disconnected from the second pole of the photoelectric conversion element;
  • the voltage supply circuit provides a second bias control voltage for the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a forward bias state, and the switch control circuit is in the switch control signal Under the control of, the second electrode of the photoelectric conversion element is controlled to be electrically connected to the discharge voltage terminal, so as to release the charge in the photoelectric conversion element to the discharge voltage terminal.
  • the fingerprint recognition detection circuit further includes a switch control circuit, an integration operational amplifier, an integration capacitor, and a discharge switch;
  • the integral time period includes an integral reset sub-period;
  • the fingerprint identification detection method further includes: in the integral reset sub-period, the discharge switch is controlled by a discharge control signal to control the positive of the integral operational amplifier.
  • the phase input terminal is connected with the output terminal of the integration operational amplifier; during the time period included in the fingerprint recognition detection phase except for the integration reset sub-time period, the discharge switch is under the control of a discharge control signal , Controlling the disconnection between the non-inverting input terminal of the integrating operational amplifier and the output terminal of the integrating operational amplifier;
  • the step of controlling the second pole of the photoelectric conversion element to access the reference voltage during the reset period includes: the switch control circuit controls the second pole of the photoelectric conversion element and the second pole of the photoelectric conversion element under the control of a switch control signal.
  • the non-inverting input terminals of the integrating operational amplifier are connected to control the second pole of the photoelectric conversion element to connect to the reference voltage;
  • the fingerprint identification detection method further includes:
  • the switch control circuit controls the second pole of the photoelectric conversion element to be disconnected from the non-inverting input terminal of the integrating operational amplifier under the control of the switch control signal;
  • the switch control circuit controls the second pole of the photoelectric conversion element to communicate with the non-inverting input terminal of the integrating operational amplifier under the control of the switch control signal, so as to connect the storage capacitor
  • the stored charge is introduced into the integrating operational amplifier to correspondingly change the voltage of the output terminal of the integrating operational amplifier, and fingerprint identification can be performed according to the voltage.
  • the fingerprint identification detection method described in at least one embodiment of the present disclosure further includes:
  • the capacitance control circuit controls the first end of the storage capacitor to be disconnected from the first pole of the photoelectric conversion element under the control of the capacitance control signal, and controls the second end of the storage capacitor Disconnected from the second pole of the photoelectric conversion element;
  • the voltage supply circuit provides a second bias control voltage for the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a forward bias state, and the discharge switch is in the state of the discharge control signal.
  • the switch control circuit controls the second photoelectric conversion element under the control of the switch control signal.
  • the pole is connected with the non-inverting input terminal of the integrating operational amplifier to release the charge in the photoelectric conversion element.
  • an embodiment of the present disclosure also provides a display device, including the above-mentioned fingerprint recognition and detection circuit.
  • FIG. 1A is a structural diagram of a fingerprint identification detection circuit according to at least one embodiment of the present disclosure
  • FIG. 1B is a structural diagram of a fingerprint identification detection circuit according to at least one embodiment of the present disclosure
  • FIG. 2A is a structural diagram of a fingerprint identification detection circuit according to at least one embodiment of the present disclosure
  • 2B is a structural diagram of a fingerprint identification detection circuit according to at least one embodiment of the present disclosure.
  • FIG. 3 is a structural diagram of a fingerprint identification detection circuit according to at least one embodiment of the present disclosure.
  • FIG. 4A is a structural diagram of a fingerprint identification detection circuit according to at least one embodiment of the present disclosure.
  • 4B is a structural diagram of a fingerprint identification detection circuit according to at least one embodiment of the present disclosure.
  • FIG. 5 is a structural diagram of a fingerprint identification detection circuit according to at least one embodiment of the present disclosure.
  • FIG. 6 is a circuit diagram of a fingerprint identification detection circuit according to at least one embodiment of the present disclosure.
  • FIG. 7 is a working sequence diagram of the first specific embodiment of the fingerprint identification detection circuit according to at least one embodiment of the present disclosure as shown in FIG. 6 under strong ambient light;
  • FIG. 8 is a working sequence diagram of the first specific embodiment of the fingerprint identification detection circuit according to at least one embodiment of the present disclosure as shown in FIG. 6 under weak ambient light;
  • FIG. 9 is a circuit diagram of a fingerprint identification detection circuit according to at least one embodiment of the present disclosure.
  • FIG. 10 is a working sequence diagram of the fingerprint identification detection circuit according to at least one embodiment of the present disclosure as shown in FIG. 9 under strong ambient light;
  • FIG. 11 is a working sequence diagram of the fingerprint identification detection circuit according to at least one embodiment of the present disclosure as shown in FIG. 9 under weak ambient light.
  • the transistors used in all the embodiments of the present disclosure may be triodes, thin film transistors or field effect transistors or other devices with the same characteristics.
  • one of the poles is called the first pole, and the other pole is called the second pole.
  • the control electrode when the transistor is a triode, can be a base electrode, the first electrode can be a collector, and the second electrode can be an emitter; or, the control electrode can be a base.
  • the first electrode may be an emitter electrode, and the second electrode may be a collector electrode.
  • the control electrode when the transistor is a thin film transistor or a field effect transistor, the control electrode may be a gate, the first electrode may be a drain, and the second electrode may be a source; or The control electrode may be a gate, the first electrode may be a source, and the second electrode may be a drain.
  • the fingerprint recognition detection circuit includes a storage capacitor C2, a capacitor control circuit 11, and a photoelectric conversion element Dz;
  • the photoelectric conversion element Dz is configured to convert the received optical signal into a corresponding electrical signal when in a photoelectric conversion state
  • the capacitance control circuit 11 is disposed between the storage capacitor C2 and the photoelectric conversion element Dz, and is configured to control the storage of at least part of the electrical signal in the storage capacitor C2 under the control of a capacitance control signal.
  • the fingerprint recognition detection circuit in at least one embodiment of the present disclosure When the fingerprint recognition detection circuit in at least one embodiment of the present disclosure is working, under strong ambient light, ambient light will affect the accuracy of fingerprint recognition; under strong ambient light, in the fingerprint recognition and detection stage, the photoelectric The conversion element Dz is in a photoelectric conversion state, and the photoelectric conversion element Dz converts the received optical signal into a corresponding electrical signal; the capacitance control circuit 11, under the control of the capacitance control signal, controls the photoelectric conversion element Dz to accumulate The charge can be transferred to the storage capacitor C2, increasing the photoelectric conversion dynamic range of the photoelectric conversion element Dz, and weakening the influence of ambient light on the accuracy of fingerprint recognition.
  • the capacitance control circuit 11 may be connected to the first pole of the photoelectric conversion element Dz, the second pole of the photoelectric conversion element Dz, and the storage capacitor C2, respectively.
  • the first end of is electrically connected to the second end of the storage capacitor C2, but it is not limited to this.
  • the fingerprint identification detection circuit described in at least one embodiment of the present disclosure may further include a voltage supply circuit
  • the voltage supply circuit is configured to provide a first bias control voltage to the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a photoelectric conversion state, or to supply the first pole of the photoelectric conversion element A second bias control voltage is provided to control the photoelectric conversion element to be in a forward bias state.
  • the voltage supply circuit provides a first bias control voltage to the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a photoelectric conversion state.
  • the voltage supply circuit provides a second bias control voltage to the first pole of the photoelectric conversion element Dz to control the photoelectric conversion element to be in a forward bias state to release the charge in the photoelectric conversion element , Export all the charges in the photoelectric conversion element, so as not to affect the imaging quality of the photoelectric conversion element, and eliminate the residual image.
  • the fingerprint recognition detection circuit includes a storage capacitor C2, a capacitance control circuit 11, a photoelectric conversion element Dz, and a voltage supply circuit 12;
  • the first pole of the photoelectric conversion element Dz is electrically connected to the voltage supply circuit 12, and the photoelectric conversion element Dz is configured to convert the received optical signal into a corresponding electrical signal when in a photoelectric conversion state;
  • the voltage supply circuit 12 is electrically connected to the first pole of the photoelectric conversion element Dz, and is configured to provide a first bias control voltage to the first pole of the photoelectric conversion element Dz to control the photoelectric conversion element Dz In a photoelectric conversion state, or providing a second bias control voltage to the first pole of the photoelectric conversion element Dz to control the photoelectric conversion element Dz to be in a forward bias state;
  • the capacitance control circuit 11 is respectively connected to the capacitance control signal terminal F1, the first terminal of the storage capacitor C2, the second terminal of the storage capacitor C2, the first pole of the photoelectric conversion element Dz, and the photoelectric conversion element
  • the second electrode of Dz is electrically connected, and is configured to control the on-off between the first end of the storage capacitor C2 and the first electrode of the photoelectric conversion element Dz under the control of the capacitance control signal, and control the The on-off between the second terminal of the storage capacitor C2 and the second pole of the photoelectric conversion element Dz;
  • the capacitance control signal terminal F1 is used to provide the capacitance control signal.
  • the voltage supply circuit 12 Provide a first bias control voltage for the first pole of the photoelectric conversion element Dz to control the photoelectric conversion element Dz to be in a photoelectric conversion state, and the photoelectric conversion element Dz converts the received optical signal into a corresponding electrical signal;
  • the capacitance control circuit 11 controls the communication between the first end of the storage capacitor C2 and the first pole of the photoelectric conversion element Dz under the control of the capacitance control signal, and controls the second end of the storage capacitor C2 to communicate with each other.
  • the second poles of the photoelectric conversion element Dz are connected, so that the charge accumulated on the photoelectric conversion element Dz can be transferred to the storage capacitor C2, which increases the photoelectric conversion dynamic range of the photoelectric conversion element Dz, and weakens fingerprint recognition by ambient light. The impact of accuracy.
  • the fingerprint recognition detection phase may include a reset time period, an integration time period, and a collection time period that are sequentially set;
  • the photoelectric conversion element Dz converts the received optical signal into a corresponding electrical signal, and charges the storage capacitor C2 through the electrical signal to change the second pole of the photoelectric conversion element.
  • fingerprint recognition can be performed based on the voltage of the second pole of the photoelectric conversion element Dz.
  • the control circuit controls the disconnection between the first end of the storage capacitor and the first pole of the photoelectric conversion element, and controls the connection between the second end of the storage capacitor and the photoelectric conversion element.
  • the second pole is disconnected;
  • the voltage supply circuit provides a first bias control voltage for the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a photoelectric conversion state;
  • the fingerprint identification detection stage includes a reset time period, an integration time period, and a collection time period that are sequentially set;
  • the photoelectric conversion element converts the received optical signal into a corresponding electrical signal, and charges the storage capacitor through the electrical signal to change the voltage of the second electrode of the photoelectric conversion element ;
  • fingerprint recognition can be performed based on the voltage of the second pole of the photoelectric conversion element.
  • the photoelectric conversion element Dz Under strong ambient light, the photoelectric conversion element Dz is easily saturated by strong light, so the storage capacitor C2 should be used to store the charge in the photoelectric conversion element Dz to avoid saturation of the photoelectric conversion element Dz due to excessive ambient light. As a result, no valid fingerprint valley information can be collected.
  • the storage C2 can be added under strong ambient light, so that the charge in the photoelectric conversion element Dz can be transferred to the storage capacitor C2, and the photoelectric conversion element Dz can be added.
  • the dynamic range of photoelectric conversion removes the influence of ambient light on fingerprint information under strong ambient light.
  • the integration time can be reduced, but the integration time is reduced, the electrical signal converted from the effective light emitted by the OLED (organic light emitting diode) (the electrical signal is The electrical signal effective for fingerprint recognition) will be reduced, so the integration time cannot be reduced indefinitely.
  • OLED organic light emitting diode
  • At least one embodiment of the present disclosure adopts a storage capacitor C2 to increase the capacitance of the control system and increase the measurement dynamic range of the photoelectric conversion element Dz, so that the photoelectric conversion element Dz is not easily saturated, so that the photoelectric conversion element Dz can collect effective data.
  • the fingerprint valley ridge information can improve the quality of fingerprint imaging.
  • the fingerprint recognition detection circuit described in at least one embodiment of the present disclosure may further include a switch control circuit and a discharge voltage terminal, where:
  • the switch control circuit is configured to control the second pole of the photoelectric conversion element to be electrically connected to the discharge voltage terminal under the control of the switch control signal, so as to release the charge in the photoelectric conversion element to the discharge Voltage terminal.
  • the fingerprint identification detection circuit described in at least one embodiment of the present disclosure may further include a switch control circuit 13 and a discharge voltage terminal Vf ,among them,
  • the switch control circuit 13 is configured to control the second pole of the photoelectric conversion element Dz to be electrically connected to the discharge voltage terminal Vf under the control of the switch control signal provided by the switch control terminal G1 to convert the photoelectric The charge in the element Dz is discharged to the discharge voltage terminal Vf.
  • the fingerprint recognition detection circuit described in at least one embodiment of the present disclosure may further include a switch control circuit 13 and a discharge voltage terminal.
  • the capacitance control circuit 11 controls the capacitance control signal under the control of the capacitance control signal.
  • the first end of the storage capacitor C2 is disconnected from the first pole of the photoelectric conversion element Dz, and the second end of the storage capacitor C2 is controlled to be disconnected from the second pole of the photoelectric conversion element Dz; voltage supply
  • the circuit 12 provides a second bias control voltage for the first pole of the photoelectric conversion element Dz to control the photoelectric conversion element to be in a forward bias state.
  • the switch control circuit 13 is under the control of the switch control signal provided by the switch control terminal G1 , Controlling the second electrode of the photoelectric conversion element Dz to be electrically connected to the discharge voltage terminal Vf, so as to release the charge in the photoelectric conversion element Dz to the discharge voltage terminal Vf, so as to be able to remove
  • the charges in the photoelectric conversion element Dz are all derived, there is no charge remaining in the photoelectric conversion element Dz, and the imaging quality of the photoelectric conversion element Dz is not affected.
  • the residual image elimination stage may be set after the fingerprint recognition and detection stage, but is not limited to this.
  • At least one embodiment of the present disclosure redesigns the fingerprint recognition detection circuit to eliminate the residual image.
  • the photoelectric conversion element Dz is in a photoelectric conversion state during normal optical fingerprint recognition, and when the residual image is eliminated, the photoelectric conversion element Dz is in a positive direction. In the bias state, the charge accumulated on the photoelectric conversion element Dz is released to remove the residual image.
  • the photoelectric conversion element Dz may be a photodiode, the first pole of the photoelectric conversion element Dz is the anode of the photodiode, and the second pole of the photoelectric conversion element Dz is the photodiode.
  • the cathode of the diode during normal optical fingerprint recognition, that is, during the fingerprint recognition and detection phase, the photodiode is in a reverse bias state to enable photoelectric conversion to convert the received optical signal into a corresponding current signal;
  • the photodiode is in a forward biased state, so that the photocharge in the photodiode can be released to remove the afterimage.
  • the photoelectric conversion element may also be any other device capable of photoelectric conversion.
  • the first bias control voltage may be a negative voltage
  • the second bias control voltage may be a positive voltage, but it is not limited thereto.
  • the fingerprint identification detection circuit described in at least one embodiment of the present disclosure may further include a reset circuit
  • the reset circuit is configured to provide a reset voltage to the second pole of the photoelectric conversion element.
  • the fingerprint recognition detection phase may include a reset time period, an integration time period, and an acquisition time period that are sequentially set.
  • the reset circuit provides a reset voltage to the second pole of the photoelectric conversion element. In this way, it can be ensured that the charges collected by each row of fingerprint identification detection circuits (the display device may include multiple rows and multiple columns of fingerprint identification detection circuits) are integrated from the same potential.
  • the fingerprint identification detection circuit As shown in FIG. 2B, based on at least one embodiment of the fingerprint identification detection circuit shown in FIG. 1B, the fingerprint identification detection circuit according to at least one embodiment of the present disclosure further includes a reset circuit 20;
  • the reset circuit 20 is electrically connected to the second pole of the photoelectric conversion element Dz, and is configured to provide a reset voltage to the second pole of the photoelectric conversion element Dz.
  • the capacitance control circuit may include a first capacitance control transistor and a second capacitance control transistor; the capacitance control signal includes a first capacitance control signal and a second capacitance control signal;
  • the control electrode of the first capacitance control transistor is electrically connected to a first capacitance control signal line, the first electrode of the first capacitance control transistor is electrically connected to the first end of the storage capacitor, and the first capacitance control transistor is electrically connected to the first end of the storage capacitor.
  • the second pole of the photoelectric conversion element is electrically connected to the first pole of the photoelectric conversion element;
  • the control electrode of the second capacitance control transistor is electrically connected to a second capacitance control signal line, the first electrode of the second capacitance control transistor is electrically connected to the second electrode of the photoelectric conversion element, and the second capacitance control The second electrode of the transistor is electrically connected to the second end of the storage capacitor;
  • the first capacitance control signal line is used to provide the first capacitance control signal
  • the second capacitance control signal line is used to provide the second capacitance control signal
  • the first capacitance control signal may be the same as the second capacitance control signal, or the first capacitance control signal may be different from the second capacitance control signal.
  • the capacitance control circuit may include a first capacitance control transistor T3 and a second capacitance control transistor T2; the capacitance control The signal includes a first capacitance control signal and a second capacitance control signal;
  • the gate of the first capacitance control transistor T3 is electrically connected to the first capacitance control signal line G3, the drain of the first capacitance control transistor T3 is electrically connected to the first end of the storage capacitor C2, and the first capacitance control transistor T3 is electrically connected to the first end of the storage capacitor C2.
  • the source of the capacitance control transistor T3 is electrically connected to the first electrode of the photoelectric conversion element Dz;
  • the gate of the second capacitance control transistor T2 is electrically connected to the second capacitance control signal line G2, the drain of the second capacitance control transistor T2 is electrically connected to the second electrode of the photoelectric conversion element Dz, and the first The source of the two-capacitance control transistor T2 is electrically connected to the second end of the storage capacitor C2;
  • the first capacitance control signal line G3 is used to provide the first capacitance control signal
  • the second capacitance control signal line G2 is used to provide the second capacitance control signal
  • both T3 and T2 are n-type thin film transistors, but not limited to this.
  • At least one embodiment of the fingerprint recognition detection circuit shown in FIG. 3 of the present disclosure is working, under strong ambient light, during the fingerprint recognition detection stage, T2 and T3 are turned on to store the photoelectric charge in Dz through C2; In the afterimage elimination phase, T2 and T3 are turned off;
  • T2 and T3 are turned off during the fingerprint recognition and detection phase and the afterimage elimination phase.
  • the voltage supply circuit may include a first voltage supply transistor and a second voltage supply transistor, wherein,
  • the control electrode of the first voltage supply transistor is electrically connected to the first voltage supply control line, the first electrode of the first voltage supply transistor is electrically connected to the first bias control voltage terminal, and the first voltage supply transistor
  • the second pole is electrically connected to the first pole of the photoelectric conversion element
  • the control electrode of the second voltage providing transistor is electrically connected to the second voltage providing control line, the first electrode of the second voltage providing transistor is electrically connected to the second bias control voltage terminal, and the second voltage providing transistor
  • the second pole is electrically connected to the first pole of the photoelectric conversion element
  • the first bias control voltage terminal is used to provide a first bias control voltage
  • the second bias control voltage terminal is used to provide a second bias control voltage
  • the voltage supply circuit 12 may include a first voltage supply transistor T5 and a second voltage supply transistor T4, wherein,
  • the gate of the first voltage supply transistor T5 is electrically connected to the first voltage supply control line G5, the drain of the first voltage supply transistor T5 is electrically connected to the first bias control voltage terminal Vp1, and the first voltage Providing the source of the transistor T5 to be electrically connected to the first electrode of the photoelectric conversion element Dz;
  • the gate of the second voltage supply transistor T4 is electrically connected to the second voltage supply control line G4, the drain of the second voltage supply transistor T4 is electrically connected to the second bias control voltage terminal Vp2, and the second voltage Providing the source of the transistor T4 to be electrically connected to the first electrode of the photoelectric conversion element Dz;
  • the first bias control voltage terminal Vp1 is used to provide a first bias control voltage
  • the second bias control voltage terminal Vp2 is used to provide a second bias control voltage
  • both T5 and T4 are n-type thin film transistors, but not limited to this.
  • At least one embodiment of the fingerprint recognition detection circuit of the present disclosure as shown in FIG. 4A is in operation.
  • T5 is turned on and T4 is turned off to control Dz to be in the photoelectric conversion state;
  • T5 is turned off Off, T4 is opened to control Dz in a forward biased state.
  • the voltage supply circuit may include a bias control voltage terminal and a bias control voltage supply circuit
  • the bias control voltage terminal is electrically connected to the first pole of the photoelectric conversion element, and the bias control voltage supply circuit is configured to provide a first bias control voltage or a second bias control voltage to the bias control voltage terminal. Set the control voltage.
  • the voltage supply circuit includes a bias control voltage terminal Vt and a bias control voltage supply circuit 121;
  • the bias control voltage terminal Vt is electrically connected to the first pole of the photoelectric conversion element, and the bias control voltage supply circuit 121 is configured to provide the bias control voltage terminal Vt with a first bias control voltage or The second bias control voltage.
  • the fingerprint recognition detection circuit may further include a switch control circuit, an integrating operational amplifier, an integrating capacitor, and a discharge switch, where:
  • the switch control circuit is respectively electrically connected to the switch control terminal, the second pole of the photoelectric conversion element, and the non-inverting input terminal of the integrating operational amplifier, and is configured to control the switch control signal provided at the switch control terminal Next, controlling the on-off between the second pole of the photoelectric conversion element and the non-inverting input terminal of the integrating operational amplifier;
  • the inverting input terminal of the integrating operational amplifier is electrically connected to the reference voltage terminal;
  • the first end of the integrating capacitor is electrically connected to the non-inverting input end of the integrating operational amplifier, and the second end of the integrating capacitor is electrically connected to the output end of the integrating operational amplifier;
  • the control terminal of the discharge switch is electrically connected with the discharge control terminal, the first terminal of the discharge switch is electrically connected with the non-inverting input terminal of the integral operational amplifier, and the second terminal of the discharge switch is electrically connected with the integral operational amplifier.
  • the discharge switch is configured to control the non-inverting input terminal of the integrating operational amplifier and the output terminal of the integrating operational amplifier under the control of the discharge control signal provided by the discharge control terminal. The on-off.
  • the fingerprint recognition detection circuit described in at least one embodiment of the present disclosure may also include a switch control circuit, an integrating operational amplifier, an integrating capacitor, and a discharge switch.
  • the reset, reset, and discharge switch can be controlled by controlling the switch control circuit and the discharge switch. Collect and discharge.
  • the fingerprint identification detection circuit described in at least one embodiment of the present disclosure may further include a switch control circuit 13 and an integrating operational amplifier A1. , Integral capacitor C1 and discharge switch K1, among them,
  • the switch control circuit 13 is electrically connected to the switch control terminal G1, the second pole of the photoelectric conversion element Dz, and the non-inverting input terminal of the integrating operational amplifier A1, respectively, and is configured to be provided at the switch control terminal G1. Under the control of a switch control signal, controlling the on-off between the second pole of the photoelectric conversion element Dz and the non-inverting input terminal of the integrating operational amplifier A1;
  • the inverting input terminal of the integrating operational amplifier A1 is electrically connected to a reference voltage terminal; the reference voltage terminal is used to provide a reference voltage Vref;
  • the first terminal of the integrating capacitor C1 is electrically connected to the non-inverting input terminal of the integrating operational amplifier A1, and the second terminal of the integrating capacitor C1 is electrically connected to the output terminal Vout of the integrating operational amplifier A1;
  • the control terminal of the discharging switch K1 is electrically connected to the discharging control terminal G0, the first terminal of the discharging switch K1 is electrically connected to the non-inverting input terminal of the integrating operational amplifier A1, and the second terminal of the discharging switch K1 is electrically connected to The output terminal Vout of the integrating operational amplifier A1 is electrically connected, and the discharge switch K1 is configured to control the non-inverting input terminal of the integrating operational amplifier A1 under the control of the discharge control signal provided by the discharge control terminal G0. The on-off between the output terminal Vout of the integrating operational amplifier A1.
  • the fingerprint identification detection phase may include a reset time period, an integration time period, and a collection time period that are sequentially set;
  • K1 is turned off and T1 is turned on to control the communication between the second pole of the photoelectric conversion element Dz and the positive input terminal of A1, because the positive input terminal of A1 and the inverting input terminal of A1 are virtual short , So the second pole of Dz is connected to Vref;
  • both K1 and T1 are turned off;
  • fingerprint identification can be performed according to the voltage of the output terminal Vout of A1;
  • K1 is turned on and T1 is turned on, so that the residual charge in Dz can be released to Vout through the opened T1 and K1, thereby eliminating the afterimage.
  • the switch control circuit may include a switch control transistor
  • the control electrode of the switch control transistor is electrically connected to the switch control terminal, the first electrode of the switch control transistor is electrically connected to the second electrode of the photoelectric conversion element, and the second electrode of the switch control transistor is electrically connected to the integral
  • the non-inverting input terminal of the operational amplifier is electrically connected.
  • the fingerprint recognition detection circuit may further include an ambient light brightness detection circuit
  • the ambient light brightness detection circuit is configured to detect the brightness of the ambient light, and control the capacitance control signal according to the brightness.
  • the ambient light brightness detection circuit According to the brightness of the ambient light detected by the ambient light brightness detection circuit, it can be determined whether it is under strong ambient light or weak ambient light, so that corresponding control timing can be adopted.
  • At least one embodiment of the fingerprint recognition detection circuit of the present disclosure includes a storage capacitor C2, a capacitor control circuit 11, a photodiode D0, a voltage supply circuit 12, a switch control circuit 13, an integrating operational amplifier A1, an integral Capacitor C1 and discharge switch K1, among them,
  • the capacitance control circuit 11 includes a first capacitance control transistor T3 and a second capacitance control transistor T2; the capacitance control signal includes a first capacitance control signal and a second capacitance control signal;
  • the gate of the first capacitance control transistor T3 is electrically connected to the first capacitance control signal line G3, the drain of the first capacitance control transistor T3 is electrically connected to the first end of the storage capacitor C2, and the first capacitance control transistor T3 is electrically connected to the first end of the storage capacitor C2.
  • the source of the capacitance control transistor T3 is electrically connected to the anode of the photodiode D0;
  • the gate of the second capacitance control transistor T2 is electrically connected to a second capacitance control signal line G2, the drain of the second capacitance control transistor T2 is electrically connected to the cathode of the photodiode D0, and the second capacitance control The source of the transistor T2 is electrically connected to the second end of the storage capacitor C2;
  • the first capacitance control signal line G3 is used to provide the first capacitance control signal
  • the second capacitance control signal line G2 is used to provide the second capacitance control signal
  • the voltage supply circuit 12 includes a first voltage supply transistor T5 and a second voltage supply transistor T4, wherein,
  • the gate of the first voltage providing transistor T5 is electrically connected to the first voltage providing control line G5, the drain of the first voltage providing transistor T5 is connected to the negative voltage VD, and the first voltage providing the source of the transistor T5
  • the pole is electrically connected to the anode of the photodiode D0;
  • the gate of the second voltage providing transistor T4 is electrically connected to the second voltage providing control line G4, the drain of the second voltage providing transistor T4 is connected to the positive voltage VDD, and the second voltage providing the source of the transistor T4 Electrically connected to the anode of the photodiode D0;
  • the switch control circuit 13 includes a switch control transistor T1;
  • the gate of the switch control transistor T1 is electrically connected to the switch control terminal G1, the drain of the switch control transistor T1 is electrically connected to the cathode of the photodiode D0, and the source of the switch control transistor T1 is electrically connected to the integral
  • the non-inverting input terminal of the operational amplifier A1 is electrically connected;
  • the inverting input terminal of the integrating operational amplifier A1 is electrically connected to a reference voltage terminal; the reference voltage terminal is used to provide a reference voltage Vref;
  • the first terminal of the integrating capacitor C1 is electrically connected to the non-inverting input terminal of the integrating operational amplifier A1, and the second terminal of the integrating capacitor C1 is electrically connected to the output terminal Vout of the integrating operational amplifier A1;
  • the control terminal of the discharging switch K1 is electrically connected to the discharging control terminal G0, the first terminal of the discharging switch K1 is electrically connected to the non-inverting input terminal of the integrating operational amplifier A1, and the second terminal of the discharging switch K1 is electrically connected to The output terminal Vout of the integrating operational amplifier A1 is electrically connected, and the discharge switch K1 is configured to control the non-inverting input terminal of the integrating operational amplifier A1 under the control of the discharge control signal provided by the discharge control terminal G0. The on-off between the output terminal Vout of the integrating operational amplifier A1.
  • VD can be greater than or equal to -8V and less than or equal to -3V
  • VDD can be greater than or equal to 2V and less than or equal to 10V
  • Vref can be greater than or equal to 1V and less than or equal to 2V, but not less than This is limited.
  • all the transistors are n-type thin film transistors, but not limited to this.
  • the first bias control voltage is VD
  • the second bias control voltage is VDD, but not limited to this.
  • one frame time may include the fingerprint recognition detection stage S1 and the residual image elimination stage S2 set in sequence, among which,
  • the fingerprint identification detection stage S1 includes a reset time period S11, an integration time period S12, and a collection time period S13 that are sequentially set;
  • the integration time period S12 includes an integration reset sub-time period S120;
  • the discharge switch K1 turns on the connection between the non-inverting input terminal of A1 and the output terminal Vout of A1, and is configured to reset the integration operational amplifier;
  • the fingerprint recognition detection stage S1 includes a time period other than the integration reset sub-time period S120. Under the control of the discharge control terminal G0, the discharge switch K1 disconnects the positive phase input terminal of A1 and the output terminal Vout of A1. the connection between;
  • G4 inputs low level, T4 turns off, G5 inputs high level, T5 turns on, the anode of D0 is connected to VD, D0 is reverse biased, D0 is in the photoelectric conversion state, and D0 turns it off.
  • the received optical signal is converted into a current signal; G2 and G3 are both input high level, T2 and T3 are both open;
  • G1 inputs a low level, T1 is turned off, and D0 converts the received light signal into a current signal to charge C2 and accumulate light charge on D0.
  • D0 converts the received light signal into a current signal to charge C2 and accumulate light charge on D0.
  • D0 As the integration process advances, D0's The cathode voltage drops after being exposed to light;
  • G1 inputs a high level, T1 is turned on, and the photoelectric charge accumulated on D0 is transferred to C1 to realize the integration function, and the voltage output by Vout is changed accordingly, and fingerprint identification can be performed according to this voltage;
  • the discharge switch K1 under the control of the discharge control terminal G0, controls the positive phase input terminal of A1 and
  • the output terminal Vout of A1 is connected, the anode of D0 is connected to VDD, D0 is in a forward biased state, VDD is introduced to the anode of D0 through T4, and the residual charge on D0 is introduced to the subsequent circuit to release, and the residual image is eliminated.
  • the operation; the capacitor does not need to remove the residual image operation, and can directly release the charge in it.
  • the duration of the integration period S12 is generally tens to hundreds of milliseconds, but it is not limited thereto.
  • one frame time may include the fingerprint recognition detection phase S1 and the residual image elimination phase S2 set in sequence, where:
  • the fingerprint identification detection stage S1 includes a reset time period S11, an integration time period S12, and a collection time period S13 that are sequentially set;
  • G2 and G3 are all input low level, T2 and T3 are closed, that is, under weak ambient light, because non-strong light generally does not saturate D0, so C2 does not work, but it also needs to remove the afterimage of D0;
  • the integration time period S12 includes an integration reset sub-time period S120;
  • the discharge switch K1 turns on the connection between the non-inverting input terminal of A1 and the output terminal Vout of A1, and is configured to reset the integration operational amplifier;
  • the discharge switch K1 is controlled by the discharge control terminal G0 to disconnect the positive phase input terminal of A1 and the output terminal of A1 The connection between Vout;
  • G4 inputs low level, T4 turns off, G5 inputs high level, T5 turns on, the anode of D0 is connected to VD, D0 is reverse biased, D0 is in the photoelectric conversion state, and D0 turns it off.
  • the received optical signal is converted into a current signal;
  • G1 inputs a low level, T1 is turned off, and D0 converts the received light signal into a current signal to charge C2 and accumulate light charge on D0.
  • D0 converts the received light signal into a current signal to charge C2 and accumulate light charge on D0.
  • D0 As the integration process advances, D0's The cathode voltage drops after being exposed to light;
  • G1 inputs a high level, T1 is turned on, and the photoelectric charge accumulated on D0 is transferred to C1 to realize the integration function, and correspondingly change the voltage output by Vout, and fingerprint identification can be performed according to this voltage;
  • G1 inputs high level
  • G4 inputs high level
  • G5 inputs low level
  • the discharge switch K1 is controlled by the discharge control terminal G0 to control the positive phase input terminal of A1 and the output terminal Vout of A1
  • the anode of D0 is connected to VDD, and D0 is in a forward-biased state.
  • VDD is introduced to the anode of D0 through T4, and the residual charge on D0 is introduced to the subsequent circuit and released to complete the afterimage elimination operation; If you need to remove the residual image, you can directly release the charge.
  • At least one embodiment of the fingerprint recognition detection circuit of the present disclosure includes a storage capacitor C2, a capacitor control circuit 11, a photodiode D0, a voltage supply circuit, a switch control circuit 13, an integrating operational amplifier A1, and an integrating capacitor.
  • the capacitance control circuit 11 includes a first capacitance control transistor T3 and a second capacitance control transistor T2; the capacitance control signal includes a first capacitance control signal and a second capacitance control signal;
  • the gate of the first capacitance control transistor T3 is electrically connected to the first capacitance control signal line G3, the drain of the first capacitance control transistor T3 is electrically connected to the first end of the storage capacitor C2, and the first capacitance control transistor T3 is electrically connected to the first end of the storage capacitor C2.
  • the source of the capacitance control transistor T3 is electrically connected to the anode of the photodiode D0;
  • the gate of the second capacitance control transistor T2 is electrically connected to a second capacitance control signal line G2, the drain of the second capacitance control transistor T2 is electrically connected to the cathode of the photodiode D0, and the second capacitance control The source of the transistor T2 is electrically connected to the second end of the storage capacitor C2;
  • the first capacitance control signal line G3 is used to provide the first capacitance control signal
  • the second capacitance control signal line G2 is used to provide the second capacitance control signal
  • the voltage supply circuit includes a bias control voltage terminal Vt and a bias control voltage supply circuit 121;
  • the bias control voltage terminal Vt is electrically connected to the anode of the photodiode D0, and the bias control voltage supply circuit 121 is configured to provide a negative voltage VD or a positive voltage VDD to the bias control voltage terminal Vt;
  • the switch control circuit 13 includes a switch control transistor T1;
  • the gate of the switch control transistor T1 is electrically connected to the switch control terminal G1, the drain of the switch control transistor T1 is electrically connected to the cathode of the photodiode D0, and the source of the switch control transistor T1 is electrically connected to the integral
  • the non-inverting input terminal of the operational amplifier A1 is electrically connected;
  • the inverting input terminal of the integrating operational amplifier A1 is electrically connected to a reference voltage terminal; the reference voltage terminal is used to provide a reference voltage Vref;
  • the first terminal of the integrating capacitor C1 is electrically connected to the non-inverting input terminal of the integrating operational amplifier A1, and the second terminal of the integrating capacitor C1 is electrically connected to the output terminal Vout of the integrating operational amplifier A1;
  • the control terminal of the discharging switch K1 is electrically connected to the discharging control terminal G0, the first terminal of the discharging switch K1 is electrically connected to the non-inverting input terminal of the integrating operational amplifier A1, and the second terminal of the discharging switch K1 is electrically connected to The output terminal Vout of the integrating operational amplifier A1 is electrically connected, and the discharge switch K1 is configured to control the non-inverting input terminal of the integrating operational amplifier A1 under the control of the discharge control signal provided by the discharge control terminal G0. The on-off between the output terminal Vout of the integrating operational amplifier A1.
  • all the transistors are n-type thin film transistors, but not limited to this.
  • one frame time may include the fingerprint recognition detection phase S1 and the residual image elimination phase S2 set in sequence, among which,
  • the fingerprint identification detection stage S1 includes a reset time period S11, an integration time period S12, and a collection time period S13 that are sequentially set;
  • the integration time period S12 includes an integration reset sub-time period S120;
  • the discharge switch K1 turns on the connection between the non-inverting input terminal of A1 and the output terminal Vout of A1, and is configured to reset the integration operational amplifier;
  • the discharge switch K1 is controlled by the discharge control terminal G0 to disconnect the positive phase input terminal of A1 and the output terminal of A1 The connection between Vout;
  • the bias control voltage supply circuit 121 provides a negative voltage VD to the bias control voltage terminal Vt, the anode of D0 is connected to VD, D0 is reverse biased, and D0 is in a photoelectric conversion state , D0 converts the received optical signal into a current signal; G2 and G3 both input high level, T2 and T3 are both open;
  • G1 inputs a low level, T1 is turned off, and D0 converts the received light signal into a current signal to charge C2 and accumulate light charge on D0.
  • D0 converts the received light signal into a current signal to charge C2 and accumulate light charge on D0.
  • D0 As the integration process advances, D0's The cathode voltage drops after being exposed to light;
  • G1 inputs a high level, T1 is turned on, and the photoelectric charge accumulated on D0 is transferred to C1 to realize the integration function, and correspondingly change the voltage output by Vout, and fingerprint identification can be performed according to this voltage;
  • the bias control voltage supply circuit 121 provides a positive voltage VDD for the bias control voltage terminal Vt, the anode of D0 is connected to VDD, and D0 is in a forward bias state, and VDD is introduced to the anode of D0, leaving D0 on the anode.
  • the electric charge is introduced into the subsequent circuit and released to complete the afterimage elimination operation; the capacitor does not need to remove the afterimage operation, and the charge in it can be directly released.
  • the duration of the integration period S12 is generally tens to hundreds of milliseconds, but it is not limited thereto.
  • one frame time may include the fingerprint recognition detection phase S1 and the residual image elimination phase S2 set in sequence, where:
  • the fingerprint identification detection stage S1 includes a reset time period S11, an integration time period S12, and a collection time period S13 that are sequentially set;
  • G2 and G3 are all input low level, T2 and T3 are closed, that is, under weak ambient light, because non-strong light generally does not saturate D0, so C2 does not work, but it also needs to remove the afterimage of D0;
  • the integration time period S12 includes an integration reset sub-time period S120;
  • the discharge switch K1 turns on the connection between the non-inverting input terminal of A1 and the output terminal Vout of A1, and is configured to reset the integration operational amplifier;
  • the discharge switch K1 is controlled by the discharge control terminal G0 to disconnect the positive phase input terminal of A1 and the output terminal of A1 The connection between Vout;
  • the bias control voltage supply circuit 121 provides a negative voltage VD to the bias control voltage terminal Vt, the anode of D0 is connected to VD, D0 is reverse biased, and D0 is in a photoelectric conversion state , D0 converts the received optical signal into a current signal;
  • G1 inputs a low level, T1 is turned off, and D0 converts the received light signal into a current signal to charge C2 and accumulate light charge on D0.
  • D0 converts the received light signal into a current signal to charge C2 and accumulate light charge on D0.
  • D0 As the integration process advances, D0's The cathode voltage drops after being exposed to light;
  • G1 inputs a high level, T1 is turned on, and the photoelectric charge accumulated on D0 is transferred to C1 to realize the integration function, and correspondingly change the voltage output by Vout, and fingerprint identification can be performed according to this voltage;
  • G1 inputs a high level, and the discharge switch K1 is controlled by the discharge control terminal G0 to control the communication between the positive phase input terminal of A1 and the output terminal Vout of A1, and the bias control voltage supply circuit 121 provides a positive voltage VDD for the bias control voltage terminal Vt, the anode of D0 is connected to VDD, D0 is in a forward bias state, VDD is introduced to the anode of D0, and the residual charge on D0 is introduced to the subsequent circuit to be released.
  • the capacitor does not need to remove the afterimage operation, and can directly discharge the charge in it.
  • the fingerprint identification and detection method is applied to the above-mentioned fingerprint identification and detection circuit, and the fingerprint identification and detection method includes:
  • the capacitance control circuit controls the storage of at least part of the electrical signal in the storage capacitor under the control of the capacitance control signal.
  • the photoelectric conversion element in the fingerprint identification and detection stage, the photoelectric conversion element is in a photoelectric conversion state, and the photoelectric conversion element converts the received optical signal into a corresponding electrical signal.
  • the capacitance control circuit under strong ambient light, the capacitance control circuit can be controlled by the capacitance control signal to control the charge accumulated on the photoelectric conversion element to be transferred to the storage capacitor, increase the photoelectric conversion dynamic range of the photoelectric conversion element, and weaken the environment The influence of light on the accuracy of fingerprint recognition.
  • the voltage supply circuit provides a first bias control voltage for the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a photoelectric conversion state, or the voltage supply circuit is the first pole of the photoelectric conversion element One pole provides a second bias control voltage to control the photoelectric conversion element to be in a forward bias state.
  • the voltage supply circuit provides a first bias control voltage to the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a photoelectric conversion state.
  • the voltage supply circuit provides a second bias control voltage to the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a forward bias state to release the charge in the photoelectric conversion element, All the charges in the photoelectric conversion element are exported so as not to affect the imaging quality of the photoelectric conversion element and eliminate the residual image.
  • the voltage supply circuit provides a first bias control voltage for the first pole of the photoelectric conversion element, To control the photoelectric conversion element to be in a photoelectric conversion state, the photoelectric conversion element converts the received optical signal into a corresponding electrical signal; the capacitance control circuit controls the first end of the storage capacitor under the control of the capacitance control signal Communicate with the first pole of the photoelectric conversion element, and control the communication between the second terminal of the storage capacitor and the second pole of the photoelectric conversion element, so that the charge accumulated on the photoelectric conversion element can be Transfer to the storage capacitor to increase the photoelectric conversion dynamic range of the photoelectric conversion element, and weaken the influence of ambient light on the accuracy of fingerprint recognition.
  • the fingerprint recognition detection stage when the brightness of the ambient light is greater than the predetermined brightness, the fingerprint recognition detection stage includes a reset time period, an integration time period, and a collection time period that are sequentially set; the fingerprint recognition detection method includes:
  • the capacitance control circuit controls the communication between the first terminal of the storage capacitor and the first pole of the photoelectric conversion element under the control of the capacitance control signal, and controls the first terminal of the storage capacitor The two ends are connected with the second pole of the photoelectric conversion element; a voltage supply circuit provides a first bias control voltage for the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a photoelectric conversion state;
  • the photoelectric conversion element converts the received optical signal into a corresponding electrical signal, and charges the storage capacitor through the electrical signal to change the voltage of the second electrode of the photoelectric conversion element ;
  • fingerprint recognition can be performed based on the voltage of the second pole of the photoelectric conversion element.
  • the predetermined brightness may be 5000 nits (nits), but is not limited to this.
  • the capacitance control circuit controls the communication between the first end of the storage capacitor and the first pole of the photoelectric conversion element, and controls the second end of the storage capacitor to communicate with the photoelectric conversion element.
  • the second pole of the element is connected to increase the capacitance of the control system, prevent the photoelectric conversion element from being saturated, and increase the measurement dynamic range.
  • the fingerprint identification detection circuit further includes a switch control circuit and a discharge voltage terminal; the fingerprint identification detection method further includes:
  • the capacitance control circuit controls the first end of the storage capacitor to be disconnected from the first pole of the photoelectric conversion element under the control of the capacitance control signal, and controls the second end of the storage capacitor Disconnected from the second pole of the photoelectric conversion element;
  • the voltage supply circuit provides a second bias control voltage for the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a forward bias state, and the switch control circuit is in the switch control signal Under the control of, the second electrode of the photoelectric conversion element is controlled to be electrically connected to the discharge voltage terminal, so as to release the charge in the photoelectric conversion element to the discharge voltage terminal.
  • the fingerprint recognition detection circuit may also include a switch control circuit and a discharge voltage terminal.
  • the voltage supply circuit provides a second bias control voltage for the first pole of the photoelectric conversion element to control all The photoelectric conversion element is in a forward bias state, and the charge in the photoelectric conversion element is released to the discharge voltage terminal, and the accumulated invalid charge is forced out, thereby improving the quality of fingerprint imaging.
  • the fingerprint identification detection stage when the brightness of the ambient light is less than or equal to the predetermined brightness, the fingerprint identification detection stage includes a reset time period, an integration time period, and a collection time period that are sequentially set; the fingerprint identification detection method includes:
  • the capacitance control circuit controls the first end of the storage capacitor to be disconnected from the first pole of the photoelectric conversion element under the control of the capacitance control signal, and controls the second end of the storage capacitor The two terminals are disconnected from the second pole of the photoelectric conversion element;
  • the voltage supply circuit provides a first bias control voltage for the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a photoelectric conversion state;
  • the photoelectric conversion element converts the received optical signal into a corresponding electrical signal, and charges the storage capacitor through the electrical signal to change the voltage of the second electrode of the photoelectric conversion element ;
  • fingerprint recognition can be performed based on the voltage of the second pole of the photoelectric conversion element.
  • the capacitor control circuit controls the first terminal of the storage capacitor to be disconnected from the first pole of the photoelectric conversion element. , And control the disconnection between the second terminal of the storage capacitor and the second pole of the photoelectric conversion element.
  • the capacitance control circuit controls the first end of the storage capacitor to be disconnected from the first pole of the photoelectric conversion element under the control of the capacitance control signal, and controls the second end of the storage capacitor Disconnected from the second pole of the photoelectric conversion element;
  • the voltage supply circuit provides a second bias control voltage for the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a forward bias state, and the switch control circuit is in the switch control signal Under the control of, the second electrode of the photoelectric conversion element is controlled to be electrically connected to the discharge voltage terminal, so as to release the charge in the photoelectric conversion element to the discharge voltage terminal.
  • the fingerprint recognition detection circuit may also include a switch control circuit and a discharge voltage terminal.
  • the voltage supply circuit provides a second bias control voltage for the first pole of the photoelectric conversion element to control all The photoelectric conversion element is in a forward bias state, and the charge in the photoelectric conversion element is released to the discharge voltage terminal, and the accumulated invalid charge is forced out, thereby improving the quality of fingerprint imaging.
  • the fingerprint recognition detection circuit further includes a switch control circuit, an integral operational amplifier, an integral capacitor, and a discharge switch;
  • the fingerprint identification detection method further includes: in the integration reset sub-period, the discharge switch controls the non-inverting input terminal of the integration operational amplifier and the output terminal of the integration operational amplifier under the control of a discharge control signal In the fingerprint identification and detection phase except for the integration reset sub-time period, the discharge switch is controlled by the discharge control signal to control the non-inverting input terminal of the integration operational amplifier Disconnected from the output terminal of the integrating operational amplifier;
  • the step of controlling the second pole of the photoelectric conversion element to access the reference voltage during the reset period includes: the switch control circuit controls the second pole of the photoelectric conversion element and the second pole of the photoelectric conversion element under the control of a switch control signal.
  • the non-inverting input terminals of the integrating operational amplifier are connected to control the second pole of the photoelectric conversion element to connect to the reference voltage;
  • the fingerprint identification detection method further includes:
  • the switch control circuit controls the second pole of the photoelectric conversion element to be disconnected from the non-inverting input terminal of the integrating operational amplifier under the control of the switch control signal;
  • the switch control circuit controls the second pole of the photoelectric conversion element to communicate with the non-inverting input terminal of the integrating operational amplifier under the control of the switch control signal, so as to connect the storage capacitor
  • the stored charge is introduced into the integrating operational amplifier to correspondingly change the voltage of the output terminal of the integrating operational amplifier, and fingerprint identification can be performed according to the voltage.
  • the fingerprint identification detection method described in at least one embodiment of the present disclosure may further include:
  • the capacitance control circuit controls the first end of the storage capacitor to be disconnected from the first pole of the photoelectric conversion element under the control of the capacitance control signal, and controls the second end of the storage capacitor Disconnected from the second pole of the photoelectric conversion element;
  • the voltage supply circuit provides a second bias control voltage for the first pole of the photoelectric conversion element to control the photoelectric conversion element to be in a forward bias state, and the discharge switch is in the state of the discharge control signal.
  • the switch control circuit controls the second photoelectric conversion element under the control of the switch control signal.
  • the electrode is electrically connected with the non-inverting input terminal of the integrating operational amplifier to release the charge in the photoelectric conversion element.
  • the display device includes the aforementioned fingerprint identification detection circuit.
  • the display device provided by at least one embodiment of the present disclosure may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and the like.

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Abstract

一种指纹识别检测电路，包括存储电容(C2)、电容控制电路(11)和光电转换元件(Dz)；光电转换元件(Dz)被配置为在处于光电转换状态时，将接收到的光信号转换为相应的电信号；电容控制电路(11)设置于存储电容(C2)和光电转换元件(Dz)之间，被配置为在电容控制信号的控制下，将至少部分电信号存储至存储电容(C2)。有益效果：能够增加光电转换元件(Dz)的光电转换动态范围，削弱环境光对指纹识别精度的影响。

Description

指纹识别检测电路、方法和显示装置 技术领域
本公开涉及指纹识别技术领域，尤其涉及一种指纹识别检测电路、方法和显示装置。
背景技术
指纹是指人的手指末端正面皮肤上凸凹不平的纹线；其中，凸起位置称为脊，凹陷位置称为谷。由于指纹具有终身不变性、唯一性和方便性，已几乎成为生物特征识别的代名词。
在相关的指纹识别技术中，光学指纹识别是一个研究热点。在进行光学指纹识别时，由于指纹谷脊之间的差异，光源照射到手指上的会产生不同的反射，从而使得到达感光器件处的光强出现变化，产生不同的光电信号，根据该光电信号即可实现对指纹谷脊的检测。
公开内容
在一个方面中，本公开实施例提供了一种指纹识别检测电路，包括存储电容、电容控制电路和光电转换元件；
所述光电转换元件被配置为在处于光电转换状态时，将接收到的光信号转换为相应的电信号；
所述电容控制电路设置于所述存储电容和所述光电转换元件之间，被配置为在电容控制信号的控制下，控制将至少部分所述电信号存储至所述存储电容。
可选的，本公开至少一实施例所述的指纹识别检测电路还包括电压提供电路；
所述电压提供电路被配置为向所述光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态，或者，向所述光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正 向偏置状态。
可选的，本公开至少一实施例所述的指纹识别检测电路还包括开关控制电路和放电电压端，其中，
所述开关控制电路被配置为在开关控制信号的控制下，控制所述光电转换元件的第二极与所述放电电压端电连接，以将所述光电转换元件中的电荷释放至所述放电电压端。
可选的，本公开至少一实施例所述的指纹识别检测电路还包括复位电路；
所述复位电路被配置为向所述光电转换元件的第二极提供复位电压。
可选的，所述光电转换元件为光电二极管，所述光电转换元件的第一极为所述光电二极管的阳极，所述光电转换元件的第二极为所述光电二极管的阴极。
可选的，所述电容控制电路包括第一电容控制晶体管和第二电容控制晶体管；所述电容控制信号包括第一电容控制信号和第二电容控制信号；
所述第一电容控制晶体管的控制极与第一电容控制信号线电连接，所述第一电容控制晶体管的第一极与所述存储电容的第一端电连接，所述第一电容控制晶体管的第二极与所述光电转换元件的第一极电连接；
所述第二电容控制晶体管的控制极与第二电容控制信号线电连接，所述第二电容控制晶体管的第一极与所述光电转换元件的第二极电连接，所述第二电容控制晶体管的第二极与所述存储电容的第二端电连接；
所述第一电容控制信号线用于提供所述第一电容控制信号，所述第二电容控制信号线用于提供所述第二电容控制信号。
可选的，所述电压提供电路包括第一电压提供晶体管和第二电压提供晶体管，其中，
所述第一电压提供晶体管的控制极与第一电压提供控制线电连接，所述第一电压提供晶体管的第一极与第一偏置控制电压端电连接，所述第一电压提供晶体管的第二极与所述光电转换元件的第一极电连接；
所述第二电压提供晶体管的控制极与第二电压提供控制线电连接，所述第二电压提供晶体管的第一极与第二偏置控制电压端电连接，所述第二电压提供晶体管的第二极与所述光电转换元件的第一极电连接；
所述第一偏置控制电压端用于提供第一偏置控制电压，所述第二偏置控制电压端用于提供第二偏置控制电压。
可选的，所述电压提供电路包括偏置控制电压端和偏置控制电压提供电路；
所述偏置控制电压端与所述光电转换元件的第一极电连接，所述偏置控制电压提供电路被配置为向所述偏置控制电压端提供第一偏置控制电压或第二偏置控制电压。
可选的，本公开至少一实施例所述的指纹识别检测电路还包括开关控制电路、积分运算放大器、积分电容和放电开关，其中，
所述开关控制电路分别与开关控制端、所述光电转换元件的第二极和所述积分运算放大器的正相输入端电连接，被配置为在所述开关控制端提供的开关控制信号的控制下，控制所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间的通断；
所述积分运算放大器的反相输入端与参考电压端电连接；
所述积分电容的第一端与所述积分运算放大器的正相输入端电连接，所述积分电容的第二端与所述积分运算放大器的输出端电连接；
所述放电开关的控制端与放电控制端电连接，所述放电开关的第一端与所述积分运算放大器的正相输入端电连接，所述放电开关的第二端与所述积分运算放大器的输出端电连接，所述放电开关被配置为在所述放电控制端提供的放电控制信号的控制下，控制所述积分运算放大器的正相输入端与所述积分运算放大器的输出端之间的通断。
可选的，所述开关控制电路包括开关控制晶体管；
所述开关控制晶体管的控制极与开关控制端电连接，所述开关控制晶体管的第一极与所述光电转换元件的第二极电连接，所述开关控制晶体管的第二极与所述积分运算放大器的正相输入端电连接。
可选的，本公开至少一实施例所述的指纹识别检测电路还包括环境光亮度检测电路；
所述环境光亮度检测电路被配置为检测环境光的亮度，并根据该亮度控制所述电容控制信号。
在第二个方面中，本公开实施例还提供了一种指纹识别检测方法，应用于上述的指纹识别检测电路，所述指纹识别检测方法包括：
光电转换元件在处于光电转换状态时，将接收到的光信号转换为相应的电信号
电容控制电路在电容控制信号的控制下，控制将至少部分所述电信号存储至存储电容。
可选的，所述指纹识别检测电路还包括电压提供电路；所述指纹识别检测方法还包括：
所述电压提供电路为所述光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态，或者，所述电压提供电路为所述光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态。
可选的，当环境光的亮度大于预定亮度时，指纹识别检测阶段包括依次设置的复位时间段、积分时间段和采集时间段；所述指纹识别检测方法包括：
在所述指纹识别检测阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间连通，并控制所述存储电容的第二端与所述光电转换元件的第二极之间连通；电压提供电路为光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态；
在所述复位时间段，控制光电转换元件的第二极接入参考电压；
在所述积分时间段，所述光电转换元件将接收到的光信号转换为相应的电信号，并通过该电信号为所述存储电容充电，以改变所述光电转换元件的第二极的电压；
在所述采集时间段，根据所述光电转换元件的第二极的电压，能够进行指纹识别。
可选的，所述指纹识别检测电路还包括开关控制电路和放电电压端；所述指纹识别检测方法还包括：
在残影消除阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电 容的第二端与所述光电转换元件的第二极之间断开；
在所述残影消除阶段，电压提供电路为光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与放电电压端电连接，以将所述光电转换元件中的电荷释放至所述放电电压端。
可选的，当环境光的亮度小于或等于预定亮度时，指纹识别检测阶段包括依次设置的复位时间段、积分时间段和采集时间段；所述指纹识别检测方法包括：
在所述指纹识别检测阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电容的第二端与所述光电转换元件的第二极之间断开；电压提供电路为光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态；
在所述复位时间段，控制光电转换元件的第二极接入参考电压；
在所述积分时间段，所述光电转换元件将接收到的光信号转换为相应的电信号，并通过该电信号为所述存储电容充电，以改变所述光电转换元件的第二极的电压；
在所述采集时间段，根据所述光电转换元件的第二极的电压，能够进行指纹识别。
可选的，所述指纹识别检测电路还包括开关控制电路和放电电压端；所述指纹识别检测方法还包括：
在残影消除阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电容的第二端与所述光电转换元件的第二极之间断开；
在所述残影消除阶段，电压提供电路为光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与放电电压端电连接，以将所述光电转换元件中的电荷释放至所述放电电压端。
可选的，所述指纹识别检测电路还包括开关控制电路、积分运算放大器、 积分电容和放电开关；
所述积分时间段包括积分复位子时间段；所述指纹识别检测方法还包括：在所述积分复位子时间段，所述放电开关在放电控制信号的控制下，控制所述积分运算放大器的正相输入端与所述积分运算放大器的输出端之间连通；在所述指纹识别检测阶段包括的除了所述积分复位子时间段之外的时间段，所述放电开关在放电控制信号的控制下，控制所述积分运算放大器的正相输入端与所述积分运算放大器的输出端之间断开；
所述在所述复位时间段，控制光电转换元件的第二极接入参考电压步骤包括：所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间连通，以控制光电转换元件的第二极接入参考电压；
所述指纹识别检测方法还包括：
在所述积分时间段，所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间断开；
在所述采集时间段，所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间连通，以将存储电容中存储的电荷导入所述积分运算放大器，以相应改变所述积分运算放大器的输出端的电压，根据该电压能够进行指纹识别。
可选的，本公开至少一实施例所述的指纹识别检测方法还包括：
在残影消除阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电容的第二端与所述光电转换元件的第二极之间断开；
在所述残影消除阶段，电压提供电路为光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，所述放电开关在放电控制信号的控制下，控制所述积分运算放大器的正相输入端与所述积分运算放大器的输出端之间导通，所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间连通，以释放所述光电转换元件中的电荷。
在第三个方面中，本公开实施例还提供了一种显示装置，包括上述的指 纹识别检测电路。
附图说明
图1A是本公开至少一实施例所述的指纹识别检测电路的结构图；
图1B是本公开至少一实施例所述的指纹识别检测电路的结构图；
图2A是本公开至少一实施例所述的指纹识别检测电路的结构图；
图2B是本公开至少一实施例所述的指纹识别检测电路的结构图；
图3是本公开至少一实施例所述的指纹识别检测电路的结构图；
图4A是本公开至少一实施例所述的指纹识别检测电路的结构图；
图4B是本公开至少一实施例所述的指纹识别检测电路的结构图；
图5是本公开至少一实施例所述的指纹识别检测电路的结构图；
图6是本公开至少一实施例所述的指纹识别检测电路的电路图；
图7是如图6所示的本公开至少一实施例所述的指纹识别检测电路的第一具体实施例在强环境光下的工作时序图；
图8是如图6所示的本公开至少一实施例所述的指纹识别检测电路的第一具体实施例在弱环境光下的工作时序图；
图9是本公开至少一实施例所述的指纹识别检测电路的电路图；
图10是如图9所示的本公开至少一实施例所述的指纹识别检测电路在强环境光下的工作时序图；
图11是如图9所示的本公开至少一实施例所述的指纹识别检测电路在弱环境光下的工作时序图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
本公开所有实施例中采用的晶体管均可以为三极管、薄膜晶体管或场效应管或其他特性相同的器件。在本公开实施例中，为区分晶体管除控制极之 外的两极，将其中一极称为第一极，另一极称为第二极。
在实际操作时，当所述晶体管为三极管时，所述控制极可以为基极，所述第一极可以为集电极，所述第二极可以发射极；或者，所述控制极可以为基极，所述第一极可以为发射极，所述第二极可以集电极。
在实际操作时，当所述晶体管为薄膜晶体管或场效应管时，所述控制极可以为栅极，所述第一极可以为漏极，所述第二极可以为源极；或者，所述控制极可以为栅极，所述第一极可以为源极，所述第二极可以为漏极。
如图1A所示，本公开至少一实施例所述的指纹识别检测电路包括存储电容C2、电容控制电路11和光电转换元件Dz；
所述光电转换元件Dz被配置为在处于光电转换状态时，将接收到的光信号转换为相应的电信号；
所述电容控制电路11设置于所述存储电容C2和所述光电转换元件Dz之间，被配置为在电容控制信号的控制下，控制将至少部分所述电信号存储至所述存储电容C2。
本公开至少一实施例所述的指纹识别检测电路在工作时，在强环境光下，环境光会对指纹识别精度造成影响；在强环境光下，在所述指纹识别检测阶段，所述光电转换元件Dz处于光电转换状态，所述光电转换元件Dz将接收到的光信号转换为相应的电信号；电容控制电路11在电容控制信号的控制下，控制使得所述光电转换元件Dz上积累的电荷能够转移到存储电容C2上，增加光电转换元件Dz的光电转换动态范围，削弱环境光对指纹识别精度的影响。
在图1A所示的本公开至少一实施例中，所述电容控制电路11可以分别与所述光电转换元件Dz的第一极、所述光电转换元件Dz的第二极、所述存储电容C2的第一端和所述存储电容C2的第二端电连接，但不以此为限。
可选的，本公开至少一实施例所述的指纹识别检测电路还可以包括电压提供电路；
所述电压提供电路被配置为向所述光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态，或者，向所述光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态。
在指纹识别检测阶段，所述电压提供电路向所述光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态。
在残影消除阶段，电压提供电路为光电转换元件Dz的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，以释放所述光电转换元件中的电荷，将光电转换元件中的电荷全部导出，以不会影响光电转换元件的成像质量，消除残影。
如图1B所示，本公开至少一实施例所述的指纹识别检测电路包括存储电容C2、电容控制电路11、光电转换元件Dz和电压提供电路12；
所述光电转换元件Dz的第一极与所述电压提供电路12电连接，所述光电转换元件Dz被配置为在处于光电转换状态时，将接收到的光信号转换为相应的电信号；
所述电压提供电路12与所述光电转换元件Dz的第一极电连接，被配置为向所述光电转换元件Dz的第一极提供第一偏置控制电压，以控制所述光电转换元件Dz处于光电转换状态，或者，向所述光电转换元件Dz的第一极提供第二偏置控制电压，以控制所述光电转换元件Dz处于正向偏置状态；
所述电容控制电路11分别与电容控制信号端F1、所述存储电容C2的第一端、所述存储电容C2的第二端、所述光电转换元件Dz的第一极和所述光电转换元件Dz的第二极电连接，被配置为在电容控制信号的控制下，控制所述存储电容C2的第一端与所述光电转换元件Dz的第一极之间的通断，并控制所述存储电容C2的第二端与所述光电转换元件Dz的第二极之间的通断；
所述电容控制信号端F1用于提供所述电容控制信号。
本公开至少一实施例所述的指纹识别检测电路在工作时，在强环境光下，环境光会对指纹识别精度造成影响；在强环境光下，在所述指纹识别检测阶段，电压提供电路12为光电转换元件Dz的第一极提供第一偏置控制电压，以控制所述光电转换元件Dz处于光电转换状态，所述光电转换元件Dz将接收到的光信号转换为相应的电信号；电容控制电路11在电容控制信号的控制下，控制所述存储电容C2的第一端与所述光电转换元件Dz的第一极之间连通，并控制所述存储电容C2的第二端与所述光电转换元件Dz的第二极之间连通，以使得所述光电转换元件Dz上积累的电荷能够转移到存储电容C2上， 增加光电转换元件Dz的光电转换动态范围，削弱环境光对指纹识别精度的影响。
在具体实施时，在强环境光下，指纹识别检测阶段可以包括依次设置的复位时间段、积分时间段和采集时间段；
在复位时间段，控制光电转换元件Dz的第二极接入参考电压；
在所述积分时间段，所述光电转换元件Dz将接收到的光信号转换为相应的电信号，并通过该电信号为所述存储电容C2充电，以改变所述光电转换元件的第二极的电压；
在所述采集时间段，根据所述光电转换元件Dz的第二极的电压，能够进行指纹识别。
本公开至少一实施例所述的指纹识别检测电路在工作时，在弱环境光下，由于环境光对指纹识别精度影响较小，因此不需要增加控制系统电容，则在指纹识别检测阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电容的第二端与所述光电转换元件的第二极之间断开；电压提供电路为光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态；
所述指纹识别检测阶段包括依次设置的复位时间段、积分时间段和采集时间段；
在所述复位时间段，控制光电转换元件的第二极接入参考电压；
在所述积分时间段，所述光电转换元件将接收到的光信号转换为相应的电信号，并通过该电信号为所述存储电容充电，以改变所述光电转换元件的第二极的电压；
在所述采集时间段，根据所述光电转换元件的第二极的电压，能够进行指纹识别。
在强环境光下，光电转换元件Dz易受强光照饱和，所以要采用存储电容C2来存储所述光电转换元件Dz中的电荷，避免由于环境光过强从而导致所述光电转换元件Dz饱和，从而采集不到有效的指纹谷脊信息的情况发生。本公开至少一实施例所述的指纹识别检测电路在工作时，可以通过在强环境光 下增加存储C2，以使得光电转换元件Dz中的电荷可以转移到存储电容C2上，增加光电转换元件Dz的光电转换动态范围，去除强环境光下环境光对指纹信息的影响。
在相关技术中，在强环境光下，比如室外，尤其是夏季，太阳光很强，在进行指纹识别时，太阳光仍然可以穿透手指到达光电转换元件Dz上，从而使得所述光电转换元件Dz饱和而影响指纹成像质量，此时为了使得光电转换元件Dz不饱和可以降低积分时间，但降低积分时间，OLED(有机发光二极管)发出的有效光所转换而成的电信号(该电信号为对指纹识别有效的电信号)就会减少，所以不能无限制的降低积分时间，但是随着时间的积累以及光电转换元件Dz自身残留电荷的问题，依然会使得所述光电转换元件Dz饱和，因此本公开至少一实施例通过采用存储电容C2，以增加控制系统电容，增大光电转换元件Dz的测量动态范围，使得所述光电转换元件Dz不容易产生饱和，使得光电转换元件Dz能够采集到有效的指纹谷脊信息，提升指纹成像质量。
可选的，本公开至少一实施例所述的指纹识别检测电路还可以包括开关控制电路和放电电压端，其中，
所述开关控制电路被配置为在开关控制信号的控制下，控制所述光电转换元件的第二极与所述放电电压端电连接，以将所述光电转换元件中的电荷释放至所述放电电压端。
如图2A所示，在图1B所示的指纹识别检测电路的至少一实施例的基础上，本公开至少一实施例所述的指纹识别检测电路还可以包括开关控制电路13和放电电压端Vf，其中，
所述开关控制电路13被配置为在开关控制端G1提供的开关控制信号的控制下，控制所述光电转换元件Dz的第二极与所述放电电压端Vf电连接，以将所述光电转换元件Dz中的电荷释放至所述放电电压端Vf。
可选的，本公开至少一实施例所述的指纹识别检测电路还可以包括开关控制电路13和放电电压端，在残影消除阶段，电容控制电路11在电容控制信号的控制下，控制所述存储电容C2的第一端与所述光电转换元件Dz的第一极之间断开，并控制所述存储电容C2的第二端与所述光电转换元件Dz的 第二极之间断开；电压提供电路12为光电转换元件Dz的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，开关控制电路13在开关控制端G1提供的开关控制信号的控制下，控制所述光电转换元件Dz的第二极与所述放电电压端Vf电连接，以将所述光电转换元件Dz中的电荷释放至所述放电电压端Vf，以能够在残影消除阶段将光电转换元件Dz中的电荷全部导出，不会存在残留于所述光电转换元件Dz中的电荷，不会影响光电转换元件Dz的成像质量。
在本公开至少一实施例中，所述残影消除阶段可以设置于指纹识别检测阶段之后，但不以此为限。
在相关技术中，在弱环境光下，比如室内，由于光电转换元件Dz的制作工艺和材料的问题，表面会存在缺陷，此种缺陷会导致光电转换元件Dz释放积累的光电荷比较慢，形成残影，在固定时间段，如若光电转换元件Dz中的光电荷无法全部导出，随着时间的积累，所述光电转换元件Dz会趋向于饱和，从而影响光电转换元件Dz对指纹信号的采集；在强环境光下，比如室外，特别是夏季，太阳光很强，当积分时间很短时，强环境光使得光电转换元件Dz产生的光电荷过多，如果不能在有效的时间内将该光电荷导出，就会逐渐积累，导致所述光电转换元件Dz饱和；当积分时间长时，强环境光会直接使得光电转换元件Dz饱和，从而不能有效的采集到指纹谷脊的信息。
本公开至少一实施例通过重新设计指纹识别检测电路，以消除残影。本公开至少一实施例所述的指纹识别检测电路在工作时，在正常光学指纹识别时，所述光电转换元件Dz处于光电转换状态，在残影消除时，所述光电转换元件Dz处于正向偏置状态，将所述光电转换元件Dz上积累的电荷释放，以此去除残影。
在本公开至少一实施例中，所述光电转换元件Dz可以为光电二极管，所述光电转换元件Dz的第一极为所述光电二极管的阳极，所述光电转换元件Dz的第二极为所述光电二极管的阴极；在正常光学指纹识别时，也即在指纹识别检测阶段，所述光电二极管处于反向偏置状态，以能够进行光电转换，将接收到的光信号转换为相应的电流信号；在残影消除时，也即在残影消除阶段，所述光电二极管处于正向偏置状态，以可以释放所述光电二极管中的 光电荷，去除残影。
在本公开至少一实施例中，所述光电转换元件也可以是任何其他能够进行光电转换的器件。
在本公开至少一实施例中，所述第一偏置控制电压可以为负电压，所述第二偏置控制电压可以为正电压，但不以此为限。
具体的，本公开至少一实施例所述的指纹识别检测电路还可以包括复位电路；
所述复位电路被配置为向所述光电转换元件的第二极提供复位电压。
在具体实施时，所述指纹识别检测阶段可以包括依次设置的复位时间段、积分时间段和采集时间段，在复位时间段，所述复位电路向所述光电转换元件的第二极提供复位电压，这样可以保证每一行指纹识别检测电路(所述显示装置可以包括多行多列指纹识别检测电路)采集的电荷是从同一电位开始积分的。
如图2B所示，在图1B所示的指纹识别检测电路的至少一实施例的基础上，本公开至少一实施例所述的指纹识别检测电路还包括复位电路20；
所述复位电路20与所述光电转换元件Dz的第二极电连接，被配置为向所述光电转换元件Dz的第二极提供复位电压。
具体的，所述电容控制电路可以包括第一电容控制晶体管和第二电容控制晶体管；所述电容控制信号包括第一电容控制信号和第二电容控制信号；
所述第一电容控制晶体管的控制极与第一电容控制信号线电连接，所述第一电容控制晶体管的第一极与所述存储电容的第一端电连接，所述第一电容控制晶体管的第二极与所述光电转换元件的第一极电连接；
所述第二电容控制晶体管的控制极与第二电容控制信号线电连接，所述第二电容控制晶体管的第一极与所述光电转换元件的第二极电连接，所述第二电容控制晶体管的第二极与所述存储电容的第二端电连接；
所述第一电容控制信号线用于提供所述第一电容控制信号，所述第二电容控制信号线用于提供所述第二电容控制信号。
在本公开至少一实施例中，第一电容控制信号可以与第二电容控制信号相同，或者，所述第一电容控制信号可以与第二电容控制信号不同。
如图3所示，在图1B所示的指纹识别检测电路的至少一实施例的基础上，所述电容控制电路可以包括第一电容控制晶体管T3和第二电容控制晶体管T2；所述电容控制信号包括第一电容控制信号和第二电容控制信号；
所述第一电容控制晶体管T3的栅极与第一电容控制信号线G3电连接，所述第一电容控制晶体管T3的漏极与所述存储电容C2的第一端电连接，所述第一电容控制晶体管T3的源极与所述光电转换元件Dz的第一极电连接；
所述第二电容控制晶体管T2的栅极与第二电容控制信号线G2电连接，所述第二电容控制晶体管T2的漏极与所述光电转换元件Dz的第二极电连接，所述第二电容控制晶体管T2的源极与所述存储电容C2的第二端电连接；
所述第一电容控制信号线G3用于提供所述第一电容控制信号，所述第二电容控制信号线G2用于提供所述第二电容控制信号。
在图3所示的至少一实施例中，T3和T2都为n型薄膜晶体管，但不以此为限。
本公开如图3所示的指纹识别检测电路的至少一实施例在工作时，在强环境光下，在指纹识别检测阶段，T2和T3打开，以通过C2来存储Dz中的光电荷；在残影消除阶段，T2和T3关断；
在弱环境光下，在指纹识别检测阶段和残影消除阶段，T2和T3关断。
根据一种具体实施方式，所述电压提供电路可以包括第一电压提供晶体管和第二电压提供晶体管，其中，
所述第一电压提供晶体管的控制极与第一电压提供控制线电连接，所述第一电压提供晶体管的第一极与第一偏置控制电压端电连接，所述第一电压提供晶体管的第二极与所述光电转换元件的第一极电连接；
所述第二电压提供晶体管的控制极与第二电压提供控制线电连接，所述第二电压提供晶体管的第一极与第二偏置控制电压端电连接，所述第二电压提供晶体管的第二极与所述光电转换元件的第一极电连接；
所述第一偏置控制电压端用于提供第一偏置控制电压，所述第二偏置控制电压端用于提供第二偏置控制电压。
如图4A所示，在图1B所示的指纹识别检测电路的至少一实施例的基础上，所述电压提供电路12可以包括第一电压提供晶体管T5和第二电压提供 晶体管T4，其中，
所述第一电压提供晶体管T5的栅极与第一电压提供控制线G5电连接，所述第一电压提供晶体管T5的漏极与第一偏置控制电压端Vp1电连接，所述第一电压提供晶体管T5的源极与所述光电转换元件Dz的第一极电连接；
所述第二电压提供晶体管T4的栅极与第二电压提供控制线G4电连接，所述第二电压提供晶体管T4的漏极与第二偏置控制电压端Vp2电连接，所述第二电压提供晶体管T4的源极与所述光电转换元件Dz的第一极电连接；
所述第一偏置控制电压端Vp1用于提供第一偏置控制电压，所述第二偏置控制电压端Vp2用于提供第二偏置控制电压。
在图4A所示的至少一实施例中，T5和T4都为n型薄膜晶体管，但不以此为限。
本公开如图4A所示的指纹识别检测电路的至少一实施例在工作时，在指纹识别检测阶段，T5打开，T4关断，以控制Dz处于光电转换状态；在残影消除阶段，T5关断，T4打开，以控制Dz处于正向偏置状态。
根据另一种具体实施方式，所述电压提供电路可以包括偏置控制电压端和偏置控制电压提供电路；
所述偏置控制电压端与所述光电转换元件的第一极电连接，所述偏置控制电压提供电路被配置为向所述偏置控制电压端提供第一偏置控制电压或第二偏置控制电压。
如图4B所示，在图1B所示的指纹识别检测电路的至少一实施例的基础上，所述电压提供电路包括偏置控制电压端Vt和偏置控制电压提供电路121；
所述偏置控制电压端Vt与所述光电转换元件的第一极电连接，所述偏置控制电压提供电路121被配置为向所述偏置控制电压端Vt提供第一偏置控制电压或第二偏置控制电压。
在本公开至少一实施例中，所述的指纹识别检测电路还可以包括开关控制电路、积分运算放大器、积分电容和放电开关，其中，
所述开关控制电路分别与开关控制端、所述光电转换元件的第二极和所述积分运算放大器的正相输入端电连接，被配置为在所述开关控制端提供的开关控制信号的控制下，控制所述光电转换元件的第二极与所述积分运算放 大器的正相输入端之间的通断；
所述积分运算放大器的反相输入端与参考电压端电连接；
所述积分电容的第一端与所述积分运算放大器的正相输入端电连接，所述积分电容的第二端与所述积分运算放大器的输出端电连接；
所述放电开关的控制端与放电控制端电连接，所述放电开关的第一端与所述积分运算放大器的正相输入端电连接，所述放电开关的第二端与所述积分运算放大器的输出端电连接，所述放电开关被配置为在所述放电控制端提供的放电控制信号的控制下，控制所述积分运算放大器的正相输入端与所述积分运算放大器的输出端之间的通断。
在具体实施时，本公开至少一实施例所述的指纹识别检测电路还可以包括开关控制电路、积分运算放大器、积分电容和放电开关，可以通过对开关控制电路和放电开关的控制，实现复位、采集和放电。
如图5所示，在图1B所示的指纹识别检测电路的至少一实施例的基础上，本公开至少一实施例所述的指纹识别检测电路还可以包括开关控制电路13、积分运算放大器A1、积分电容C1和放电开关K1，其中，
所述开关控制电路13分别与开关控制端G1、所述光电转换元件Dz的第二极和所述积分运算放大器A1的正相输入端电连接，被配置为在所述开关控制端G1提供的开关控制信号的控制下，控制所述光电转换元件Dz的第二极与所述积分运算放大器A1的正相输入端之间的通断；
所述积分运算放大器A1的反相输入端与参考电压端电连接；所述参考电压端用于提供参考电压Vref；
所述积分电容C1的第一端与所述积分运算放大器A1的正相输入端电连接，所述积分电容C1的第二端与所述积分运算放大器A1的输出端Vout电连接；
所述放电开关K1的控制端与放电控制端G0电连接，所述放电开关K1的第一端与所述积分运算放大器A1的正相输入端电连接，所述放电开关K1的第二端与所述积分运算放大器A1的输出端Vout电连接，所述放电开关K1被配置为在所述放电控制端G0提供的放电控制信号的控制下，控制所述积分运算放大器A1的正相输入端与所述积分运算放大器A1的输出端Vout之 间的通断。
本公开如图5所示的指纹识别检测电路的至少一实施例在工作时，指纹识别检测阶段可以包括依次设置的复位时间段、积分时间段和采集时间段；
在复位阶段，K1关断，T1打开，以控制光电转换元件Dz的第二极与A1的正相输入端之间连通，由于A1的正相输入端与A1的反相输入端之间虚短，因此Dz的第二极接入Vref；
在积分识别时间段，K1和T1都关断；
在采集时间段，K1关断，T1打开，以将电荷(在强环境光下，该电荷为C2和Dz中的电荷，在弱环境光下，该电荷为Dz中的电荷)导入至积分电容中，以改变A1的输出端Vout的电压，从而能够根据A1的输出端Vout的电压进行指纹识别；
在残影消除阶段，K1打开，T1打开，以能够将Dz中残留的电荷通过打开的T1和K1释放至Vout，从而消除残影。
具体的，所述开关控制电路可以包括开关控制晶体管；
所述开关控制晶体管的控制极与开关控制端电连接，所述开关控制晶体管的第一极与所述光电转换元件的第二极电连接，所述开关控制晶体管的第二极与所述积分运算放大器的正相输入端电连接。
在本公开至少一实施例中，所述指纹识别检测电路还可以包括环境光亮度检测电路；
所述环境光亮度检测电路被配置为检测环境光的亮度，并根据该亮度控制所述电容控制信号。
根据所述环境光亮度检测电路检测到的环境光的亮度，能够判断是处于强环境光下还是弱环境光下，从而可以采用相应的控制时序。
如图6所示，本公开所述的指纹识别检测电路的至少一实施例包括存储电容C2、电容控制电路11、光电二极管D0、电压提供电路12、开关控制电路13、积分运算放大器A1、积分电容C1和放电开关K1，其中，
所述电容控制电路11包括第一电容控制晶体管T3和第二电容控制晶体管T2；所述电容控制信号包括第一电容控制信号和第二电容控制信号；
所述第一电容控制晶体管T3的栅极与第一电容控制信号线G3电连接， 所述第一电容控制晶体管T3的漏极与所述存储电容C2的第一端电连接，所述第一电容控制晶体管T3的源极与所述光电二极管D0的阳极电连接；
所述第二电容控制晶体管T2的栅极与第二电容控制信号线G2电连接，所述第二电容控制晶体管T2的漏极与所述光电二极管D0的阴极电连接，所述第二电容控制晶体管T2的源极与所述存储电容C2的第二端电连接；
所述第一电容控制信号线G3用于提供所述第一电容控制信号，所述第二电容控制信号线G2用于提供所述第二电容控制信号；
所述电压提供电路12包括第一电压提供晶体管T5和第二电压提供晶体管T4，其中，
所述第一电压提供晶体管T5的栅极与第一电压提供控制线G5电连接，所述第一电压提供晶体管T5的漏极与接入负电压VD，所述第一电压提供晶体管T5的源极与所述光电二极管D0的阳极电连接；
所述第二电压提供晶体管T4的栅极与第二电压提供控制线G4电连接，所述第二电压提供晶体管T4的漏极接入正电压VDD，所述第二电压提供晶体管T4的源极与所述光电二极管D0的阳极电连接；
所述开关控制电路13包括开关控制晶体管T1；
所述开关控制晶体管T1的栅极与开关控制端G1电连接，所述开关控制晶体管T1的漏极与所述光电二极管D0的阴极电连接，所述开关控制晶体管T1的源极与所述积分运算放大器A1的正相输入端电连接；
所述积分运算放大器A1的反相输入端与参考电压端电连接；所述参考电压端用于提供参考电压Vref；
所述积分电容C1的第一端与所述积分运算放大器A1的正相输入端电连接，所述积分电容C1的第二端与所述积分运算放大器A1的输出端Vout电连接；
所述放电开关K1的控制端与放电控制端G0电连接，所述放电开关K1的第一端与所述积分运算放大器A1的正相输入端电连接，所述放电开关K1的第二端与所述积分运算放大器A1的输出端Vout电连接，所述放电开关K1被配置为在所述放电控制端G0提供的放电控制信号的控制下，控制所述积分运算放大器A1的正相输入端与所述积分运算放大器A1的输出端Vout之 间的通断。
在本公开至少一实施例中，VD可以大于或等于-8V而小于或等于-3V，VDD可以大于或等于2V而小于或等于10V，Vref可以大于或等于1V而小于或等于2V，但不以此为限。
在图6所示的至少一实施例中，所有的晶体管都为n型薄膜晶体管，但不以此为限。
在图6所示的至少一实施例中，第一偏置控制电压为VD，第二偏置控制电压为VDD，但不以此为限。
如图7所示，如图6所示的指纹识别检测电路工作在强环境光下时，一帧时间可以包括依次设置的指纹识别检测阶段S1和残影消除阶段S2，其中，
所述指纹识别检测阶段S1包括依次设置的复位时间段S11、积分时间段S12和采集时间段S13；
所述积分时间段S12包括积分复位子时间段S120；
在所述积分复位子时间段S120，放电开关K1在放电控制端G0的控制下，导通A1的正相输入端与A1的输出端Vout之间的连接，被配置为复位积分运算放大器；在所述指纹识别检测阶段S1包括的除了所述积分复位子时间段S120之外的时间段，放电开关K1在放电控制端G0的控制下，断开A1的正相输入端与A1的输出端Vout之间的连接；
在所述指纹识别检测阶段S1，G4输入低电平，T4关断，G5输入高电平，T5打开，D0的阳极接入VD，D0反向偏置，D0处于光电转换状态，D0将其接收到的光信号转换为电流信号；G2和G3都输入高电平，T2和T3都打开；
在所述复位时间段S11，G1输入高电平，T1打开，由于A1虚短，D0的阴极接入Vref，这样可以保证每一行指纹识别检测电路采集的电荷是从同一电位开始积分；
在积分时间段S12，G1输入低电平，T1关断，D0将其接收到的光信号转换为电流信号，以为C2充电，并会在D0上积光电荷，随着积分过程推进，D0的阴极电压在受到光照后下降；
在采集时间段S13，G1输入高电平，T1打开，D0上积累的光电荷转移 到C1上，实现积分的功能，相应改变Vout输出的电压，根据该电压能够进行指纹识别；
在完成光学指纹采集之后，将T2和T3关闭，使得C2不起作用；光电二极管D0由于制作工艺的问题，表面会存在缺陷，此种缺陷会导致D0释放所积的光电荷比较慢，形成残影，在下一帧时间包括的采集时间段会采集到上一帧时间D0残留的电荷，所以要将D0残留的电荷冲掉；
在残影消除阶段S2，G1输入高电平，G4输入高电平，G5、G2和G3都输入低电平，放电开关K1在放电控制端G0的控制下，控制A1的正相输入端与A1的输出端Vout之间连通，D0的阳极接入VDD，D0处于正向偏置状态，VDD经过T4导入到D0的阳极，将D0上残留的电荷导入到后续电路释放掉，完成残影消除的操作；电容不需要去除残影的操作，可以直接将其中的电荷释放掉。
在本公开至少一实施例中，所述积分时间段S12持续的时间一般在几十到几百毫秒，但不以此为限。
如图8所示，如图6所示的指纹识别检测电路工作在弱环境光下时，一帧时间可以包括依次设置的指纹识别检测阶段S1和残影消除阶段S2，其中，
所述指纹识别检测阶段S1包括依次设置的复位时间段S11、积分时间段S12和采集时间段S13；
在所述指纹识别检测阶段S1和残影消除阶段S2，G2和G3都输入低电平，T2和T3关闭，也即，在弱环境光下，由于非强光一般不会使得D0饱和，因此C2不工作，但是同样需要去除D0的残影；
所述积分时间段S12包括积分复位子时间段S120；
在所述积分复位子时间段S120，放电开关K1在放电控制端G0的控制下，导通A1的正相输入端与A1的输出端Vout之间的连接，被配置为复位积分运算放大器；
在所述指纹识别检测阶段S1包括的除了所述积分复位子时间段S120之外的时间段，放电开关K1在放电控制端G0的控制下，断开A1的正相输入端与A1的输出端Vout之间的连接；
在所述指纹识别检测阶段S1，G4输入低电平，T4关断，G5输入高电平， T5打开，D0的阳极接入VD，D0反向偏置，D0处于光电转换状态，D0将其接收到的光信号转换为电流信号；
在所述复位时间段S11，G1输入高电平，T1打开，由于A1虚短，D0的阴极接入Vref，这样可以保证采集的每一行的电荷是从同一电位开始积分；
在积分时间段S12，G1输入低电平，T1关断，D0将其接收到的光信号转换为电流信号，以为C2充电，并会在D0上积光电荷，随着积分过程推进，D0的阴极电压在受到光照后下降；
在采集时间段S13，G1输入高电平，T1打开，D0上积累的光电荷转移到C1上，实现积分的功能，相应改变Vout输出的电压，根据该电压能够进行指纹识别；
光电二极管D0由于制作工艺的问题，表面会存在缺陷，此种缺陷会导致D0释放所积的光电荷比较慢，形成残影，在下一帧时间包括的采集时间段会采集到上一帧时间D0残留的电荷，所以要将D0残留的电荷冲掉；
在残影消除阶段S2，G1输入高电平，G4输入高电平，G5输入低电平，放电开关K1在放电控制端G0的控制下，控制A1的正相输入端与A1的输出端Vout之间连通，D0的阳极接入VDD，D0处于正向偏置状态，VDD经过T4导入到D0的阳极，将D0上残留的电荷导入到后续电路释放掉，完成残影消除的操作；电容不需要去除残影的操作，可以直接将其中的电荷释放掉。
如图9所示，本公开所述的指纹识别检测电路的至少一实施例包括存储电容C2、电容控制电路11、光电二极管D0、电压提供电路、开关控制电路13、积分运算放大器A1、积分电容C1和放电开关K1，其中，
所述电容控制电路11包括第一电容控制晶体管T3和第二电容控制晶体管T2；所述电容控制信号包括第一电容控制信号和第二电容控制信号；
所述第一电容控制晶体管T3的栅极与第一电容控制信号线G3电连接，所述第一电容控制晶体管T3的漏极与所述存储电容C2的第一端电连接，所述第一电容控制晶体管T3的源极与所述光电二极管D0的阳极电连接；
所述第二电容控制晶体管T2的栅极与第二电容控制信号线G2电连接，所述第二电容控制晶体管T2的漏极与所述光电二极管D0的阴极电连接，所 述第二电容控制晶体管T2的源极与所述存储电容C2的第二端电连接；
所述第一电容控制信号线G3用于提供所述第一电容控制信号，所述第二电容控制信号线G2用于提供所述第二电容控制信号；
所述电压提供电路包括偏置控制电压端Vt和偏置控制电压提供电路121；
所述偏置控制电压端Vt与所述光电二极管D0的阳极电连接，所述偏置控制电压提供电路121被配置为向所述偏置控制电压端Vt提供负电压VD或正电压VDD；
所述开关控制电路13包括开关控制晶体管T1；
所述开关控制晶体管T1的栅极与开关控制端G1电连接，所述开关控制晶体管T1的漏极与所述光电二极管D0的阴极电连接，所述开关控制晶体管T1的源极与所述积分运算放大器A1的正相输入端电连接；
所述积分运算放大器A1的反相输入端与参考电压端电连接；所述参考电压端用于提供参考电压Vref；
所述积分电容C1的第一端与所述积分运算放大器A1的正相输入端电连接，所述积分电容C1的第二端与所述积分运算放大器A1的输出端Vout电连接；
所述放电开关K1的控制端与放电控制端G0电连接，所述放电开关K1的第一端与所述积分运算放大器A1的正相输入端电连接，所述放电开关K1的第二端与所述积分运算放大器A1的输出端Vout电连接，所述放电开关K1被配置为在所述放电控制端G0提供的放电控制信号的控制下，控制所述积分运算放大器A1的正相输入端与所述积分运算放大器A1的输出端Vout之间的通断。
在图9所示的至少一实施例中，所有的晶体管都为n型薄膜晶体管，但不以此为限。
如图10所示，如图9所示的指纹识别检测电路工作在强环境光下时，一帧时间可以包括依次设置的指纹识别检测阶段S1和残影消除阶段S2，其中，
所述指纹识别检测阶段S1包括依次设置的复位时间段S11、积分时间段S12和采集时间段S13；
所述积分时间段S12包括积分复位子时间段S120；
在所述积分复位子时间段S120，放电开关K1在放电控制端G0的控制下，导通A1的正相输入端与A1的输出端Vout之间的连接，被配置为复位积分运算放大器；
在所述指纹识别检测阶段S1包括的除了所述积分复位子时间段S120之外的时间段，放电开关K1在放电控制端G0的控制下，断开A1的正相输入端与A1的输出端Vout之间的连接；
在所述指纹识别检测阶段S1，所述偏置控制电压提供电路121为所述偏置控制电压端Vt提供负电压VD，D0的阳极接入VD，D0反向偏置，D0处于光电转换状态，D0将其接收到的光信号转换为电流信号；G2和G3都输入高电平，T2和T3都打开；
在所述复位时间段S11，G1输入高电平，T1打开，由于A1虚短，D0的阴极接入Vref，这样可以保证采集的每一行的电荷是从同一电位开始积分；
在积分时间段S12，G1输入低电平，T1关断，D0将其接收到的光信号转换为电流信号，以为C2充电，并会在D0上积光电荷，随着积分过程推进，D0的阴极电压在受到光照后下降；
在采集时间段S13，G1输入高电平，T1打开，D0上积累的光电荷转移到C1上，实现积分的功能，相应改变Vout输出的电压，根据该电压能够进行指纹识别；
在完成光学指纹采集之后，将T2和T3关闭，使得C2不起作用；光电二极管D0由于制作工艺的问题，表面会存在缺陷，此种缺陷会导致D0释放所积的光电荷比较慢，形成残影，在下一帧时间包括的采集时间段会采集到上一帧时间D0残留的电荷，所以要将D0残留的电荷冲掉；
在残影消除阶段S2，G1输入高电平，G2和G3都输入低电平，放电开关K1在放电控制端G0的控制下，控制A1的正相输入端与A1的输出端Vout之间连通，所述偏置控制电压提供电路121为所述偏置控制电压端Vt提供正电压VDD，D0的阳极接入VDD，D0处于正向偏置状态，VDD导入到D0的阳极，将D0上残留的电荷导入到后续电路释放掉，完成残影消除的操作；电容不需要去除残影的操作，可以直接将其中的电荷释放掉。
在本公开至少一实施例中，所述积分时间段S12持续的时间一般在几十 到几百毫秒，但不以此为限。
如图11所示，如图9所示的指纹识别检测电路工作在弱环境光下时，一帧时间可以包括依次设置的指纹识别检测阶段S1和残影消除阶段S2，其中，
所述指纹识别检测阶段S1包括依次设置的复位时间段S11、积分时间段S12和采集时间段S13；
在所述指纹识别检测阶段S1和残影消除阶段S2，G2和G3都输入低电平，T2和T3关闭，也即，在弱环境光下，由于非强光一般不会使得D0饱和，因此C2不工作，但是同样需要去除D0的残影；
所述积分时间段S12包括积分复位子时间段S120；
在所述积分复位子时间段S120，放电开关K1在放电控制端G0的控制下，导通A1的正相输入端与A1的输出端Vout之间的连接，被配置为复位积分运算放大器；
在所述指纹识别检测阶段S1包括的除了所述积分复位子时间段S120之外的时间段，放电开关K1在放电控制端G0的控制下，断开A1的正相输入端与A1的输出端Vout之间的连接；
在所述指纹识别检测阶段S1，所述偏置控制电压提供电路121为所述偏置控制电压端Vt提供负电压VD，D0的阳极接入VD，D0反向偏置，D0处于光电转换状态，D0将其接收到的光信号转换为电流信号；
在所述复位时间段S11，G1输入高电平，T1打开，由于A1虚短，D0的阴极接入Vref，这样可以保证采集的每一行的电荷是从同一电位开始积分；
在积分时间段S12，G1输入低电平，T1关断，D0将其接收到的光信号转换为电流信号，以为C2充电，并会在D0上积光电荷，随着积分过程推进，D0的阴极电压在受到光照后下降；
在采集时间段S13，G1输入高电平，T1打开，D0上积累的光电荷转移到C1上，实现积分的功能，相应改变Vout输出的电压，根据该电压能够进行指纹识别；
光电二极管D0由于制作工艺的问题，表面会存在缺陷，此种缺陷会导致D0释放所积的光电荷比较慢，形成残影，在下一帧时间包括的采集时间段会采集到上一帧时间D0残留的电荷，所以要将D0残留的电荷冲掉；
在残影消除阶段S2，G1输入高电平，放电开关K1在放电控制端G0的控制下，控制A1的正相输入端与A1的输出端Vout之间连通，所述偏置控制电压提供电路121为所述偏置控制电压端Vt提供正电压VDD，D0的阳极接入VDD，D0处于正向偏置状态，VDD导入到D0的阳极，将D0上残留的电荷导入到后续电路释放掉，完成残影消除的操作；电容不需要去除残影的操作，可以直接将其中的电荷释放掉。
本公开至少一实施例所述的指纹识别检测方法，应用于上述的指纹识别检测电路，所述指纹识别检测方法包括：
光电转换元件在处于光电转换状态时，将接收到的光信号转换为相应的电信号电容控制电路在电容控制信号的控制下，控制将至少部分所述电信号存储至存储电容。
在本公开至少一实施例所述的指纹识别检测方法中，在所述指纹识别检测阶段，所述光电转换元件处于光电转换状态，所述光电转换元件将接收到的光信号转换为相应的电信号；在强环境光下，电容控制电路能够在电容控制信号的控制下，控制使得所述光电转换元件上积累的电荷能够转移到存储电容上，增加光电转换元件的光电转换动态范围，削弱环境光对指纹识别精度的影响。
可选的，所述指纹识别检测电路还可以包括电压提供电路；所述指纹识别检测方法还可以包括：
所述电压提供电路为所述光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态，或者，所述电压提供电路为所述光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态。
在指纹识别检测阶段，所述电压提供电路向所述光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态。
在残影消除阶段，电压提供电路为光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，以释放所述光电转换元件中的电荷，将光电转换元件中的电荷全部导出，以不会影响光电转换元件的成像质量，消除残影。
本公开至少一实施例所述的指纹识别检测方法在工作时，在强环境光下，在所述指纹识别检测阶段，电压提供电路为光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态，所述光电转换元件将接收到的光信号转换为相应的电信号；电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间连通，并控制所述存储电容的第二端与所述光电转换元件的第二极之间连通，以使得所述光电转换元件上积累的电荷能够转移到存储电容上，增加光电转换元件的光电转换动态范围，削弱环境光对指纹识别精度的影响。
具体的，当环境光的亮度大于预定亮度时，指纹识别检测阶段包括依次设置的复位时间段、积分时间段和采集时间段；所述指纹识别检测方法包括：
在所述指纹识别检测阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间连通，并控制所述存储电容的第二端与所述光电转换元件的第二极之间连通；电压提供电路为光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态；
在所述复位时间段，控制光电转换元件的第二极接入参考电压；
在所述积分时间段，所述光电转换元件将接收到的光信号转换为相应的电信号，并通过该电信号为所述存储电容充电，以改变所述光电转换元件的第二极的电压；
在所述采集时间段，根据所述光电转换元件的第二极的电压，能够进行指纹识别。
在本公开至少一实施例中，所述预定亮度可以为5000nit(尼特)，但不以此为限。
在具体实施时，在强环境光下，电容控制电路控制存储电容的第一端与所述光电转换元件的第一极之间连通，并控制所述存储电容的第二端与所述光电转换元件的第二极之间连通，以增加控制系统电容，防止光电转换元件饱和，增加测量动态范围。
具体的，所述指纹识别检测电路还包括开关控制电路和放电电压端；所述指纹识别检测方法还包括：
在残影消除阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电容的第二端与所述光电转换元件的第二极之间断开；
在所述残影消除阶段，电压提供电路为光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与放电电压端电连接，以将所述光电转换元件中的电荷释放至所述放电电压端。
在具体实施时，所述指纹识别检测电路还可以包括开关控制电路和放电电压端，在残影消除阶段，电压提供电路为光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，将光电转换元件中的电荷释放至放电电压端，将积累的无效电荷强制导出，从而提高指纹成像质量。
具体的，当环境光的亮度小于或等于预定亮度时，指纹识别检测阶段包括依次设置的复位时间段、积分时间段和采集时间段；所述指纹识别检测方法包括：
在所述指纹识别检测阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电容的第二端与所述光电转换元件的第二极之间断开；电压提供电路为光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态；
在所述复位时间段，控制光电转换元件的第二极接入参考电压；
在所述积分时间段，所述光电转换元件将接收到的光信号转换为相应的电信号，并通过该电信号为所述存储电容充电，以改变所述光电转换元件的第二极的电压；
在所述采集时间段，根据所述光电转换元件的第二极的电压，能够进行指纹识别。
在具体实施时，在弱环境光下，不需要采用存储电容，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电容的第二端与所述光电转换元件的第二 极之间断开。
具体的，所述指纹识别检测电路还可以包括开关控制电路和放电电压端；所述指纹识别检测方法还包括：
在残影消除阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电容的第二端与所述光电转换元件的第二极之间断开；
在所述残影消除阶段，电压提供电路为光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与放电电压端电连接，以将所述光电转换元件中的电荷释放至所述放电电压端。
在具体实施时，所述指纹识别检测电路还可以包括开关控制电路和放电电压端，在残影消除阶段，电压提供电路为光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，将光电转换元件中的电荷释放至放电电压端，将积累的无效电荷强制导出，从而提高指纹成像质量。
在具体实施时，所述指纹识别检测电路还包括开关控制电路、积分运算放大器、积分电容和放电开关；
所述指纹识别检测方法还包括：在所述积分复位子时间段，所述放电开关在放电控制信号的控制下，控制所述积分运算放大器的正相输入端与所述积分运算放大器的输出端之间连通；在所述指纹识别检测阶段包括的除了所述积分复位子时间段之外的时间段，所述放电开关在放电控制信号的控制下，控制所述积分运算放大器的正相输入端与所述积分运算放大器的输出端之间断开；
所述在所述复位时间段，控制光电转换元件的第二极接入参考电压步骤包括：所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间连通，以控制光电转换元件的第二极接入参考电压；
所述指纹识别检测方法还包括：
在所述积分时间段，所述开关控制电路在开关控制信号的控制下，控制 所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间断开；
在所述采集时间段，所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间连通，以将存储电容中存储的电荷导入所述积分运算放大器，以相应改变所述积分运算放大器的输出端的电压，根据该电压能够进行指纹识别。
具体的，本公开至少一实施例所述的指纹识别检测方法还可以包括：
在残影消除阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电容的第二端与所述光电转换元件的第二极之间断开；
在所述残影消除阶段，电压提供电路为光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，所述放电开关在放电控制信号的控制下，控制所述积分运算放大器的正相输入端与所述积分运算放大器的输出端之间导通，所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间连通电连接，以释放所述光电转换元件中的电荷。
本公开至少一实施例所述的显示装置包括上述的指纹识别检测电路。
本公开至少一实施例所提供的显示装置可以为手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
以上所述是本公开的实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本公开所述原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本公开的保护范围。

Claims (20)

  1. 一种指纹识别检测电路，包括存储电容、电容控制电路和光电转换元件；
    所述光电转换元件被配置为在处于光电转换状态时，将接收到的光信号转换为相应的电信号；
    所述电容控制电路设置于所述存储电容和所述光电转换元件之间，被配置为在电容控制信号的控制下，控制将至少部分所述电信号存储至所述存储电容。
  2. 如权利要求1所述的指纹识别检测电路，其中，还包括电压提供电路；
    所述电压提供电路被配置为向所述光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态，或者，向所述光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态。
  3. 如权利要求1或2所述的指纹识别检测电路，其中，还包括开关控制电路和放电电压端；
    所述开关控制电路被配置为在开关控制信号的控制下，控制所述光电转换元件的第二极与所述放电电压端电连接，以将所述光电转换元件中的电荷释放至所述放电电压端。
  4. 如权利要求1或2所述的指纹识别检测电路，其中，还包括复位电路；
    所述复位电路被配置为向所述光电转换元件的第二极提供复位电压。
  5. 如权利要求1或2所述的指纹识别检测电路，其中，所述光电转换元件为光电二极管，所述光电转换元件的第一极为所述光电二极管的阳极，所述光电转换元件的第二极为所述光电二极管的阴极。
  6. 如权利要求1至5中任一权利要求所述的指纹识别检测电路，其中，所述电容控制电路包括第一电容控制晶体管和第二电容控制晶体管；所述电容控制信号包括第一电容控制信号和第二电容控制信号；
    所述第一电容控制晶体管的控制极与第一电容控制信号线电连接，所述第一电容控制晶体管的第一极与所述存储电容的第一端电连接，所述第一电 容控制晶体管的第二极与所述光电转换元件的第一极电连接；
    所述第二电容控制晶体管的控制极与第二电容控制信号线电连接，所述第二电容控制晶体管的第一极与所述光电转换元件的第二极电连接，所述第二电容控制晶体管的第二极与所述存储电容的第二端电连接；
    所述第一电容控制信号线用于提供所述第一电容控制信号，所述第二电容控制信号线用于提供所述第二电容控制信号。
  7. 如权利要求2所述的指纹识别检测电路，其中，所述电压提供电路包括第一电压提供晶体管和第二电压提供晶体管，其中，
    所述第一电压提供晶体管的控制极与第一电压提供控制线电连接，所述第一电压提供晶体管的第一极与第一偏置控制电压端电连接，所述第一电压提供晶体管的第二极与所述光电转换元件的第一极电连接；
    所述第二电压提供晶体管的控制极与第二电压提供控制线电连接，所述第二电压提供晶体管的第一极与第二偏置控制电压端电连接，所述第二电压提供晶体管的第二极与所述光电转换元件的第一极电连接；
    所述第一偏置控制电压端用于提供第一偏置控制电压，所述第二偏置控制电压端用于提供第二偏置控制电压。
  8. 如权利要求2所述的指纹识别检测电路，其中，所述电压提供电路包括偏置控制电压端和偏置控制电压提供电路；
    所述偏置控制电压端与所述光电转换元件的第一极电连接，所述偏置控制电压提供电路被配置为向所述偏置控制电压端提供第一偏置控制电压或第二偏置控制电压。
  9. 如权利要求1或2所述的指纹识别检测电路，其中，还包括开关控制电路、积分运算放大器、积分电容和放电开关，其中，
    所述开关控制电路分别与开关控制端、所述光电转换元件的第二极和所述积分运算放大器的正相输入端电连接，被配置为在所述开关控制端提供的开关控制信号的控制下，控制所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间的通断；
    所述积分运算放大器的反相输入端与参考电压端电连接；
    所述积分电容的第一端与所述积分运算放大器的正相输入端电连接，所 述积分电容的第二端与所述积分运算放大器的输出端电连接；
    所述放电开关的控制端与放电控制端电连接，所述放电开关的第一端与所述积分运算放大器的正相输入端电连接，所述放电开关的第二端与所述积分运算放大器的输出端电连接，所述放电开关被配置为在所述放电控制端提供的放电控制信号的控制下，控制所述积分运算放大器的正相输入端与所述积分运算放大器的输出端之间的通断。
  10. 如权利要求9所述的指纹识别检测电路，其中，所述开关控制电路包括开关控制晶体管；
    所述开关控制晶体管的控制极与开关控制端电连接，所述开关控制晶体管的第一极与所述光电转换元件的第二极电连接，所述开关控制晶体管的第二极与所述积分运算放大器的正相输入端电连接。
  11. 如权利要求1至10中任一权利要求所述的指纹识别检测电路，其中，还包括环境光亮度检测电路；
    所述环境光亮度检测电路被配置为检测环境光的亮度，并根据该亮度控制所述电容控制信号。
  12. 一种指纹识别检测方法，应用于如权利要求1至11中任一权利要求所述的指纹识别检测电路，所述指纹识别检测方法包括：
    光电转换元件在处于光电转换状态时，将接收到的光信号转换为相应的电信号
    电容控制电路在电容控制信号的控制下，控制将至少部分所述电信号存储至存储电容。
  13. 如权利要求12所述的指纹识别检测方法，其中，所述指纹识别检测电路还包括电压提供电路；所述指纹识别检测方法还包括：
    所述电压提供电路为所述光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态，或者，所述电压提供电路为所述光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态。
  14. 如权利要求13所述的指纹识别检测方法，其中，当环境光的亮度大于预定亮度时，指纹识别检测阶段包括依次设置的复位时间段、积分时间段 和采集时间段；所述指纹识别检测方法包括：
    在所述指纹识别检测阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间连通，并控制所述存储电容的第二端与所述光电转换元件的第二极之间连通；电压提供电路为光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态；
    在所述复位时间段，控制光电转换元件的第二极接入参考电压；
    在所述积分时间段，所述光电转换元件将接收到的光信号转换为相应的电信号，并通过该电信号为所述存储电容充电，以改变所述光电转换元件的第二极的电压；
    在所述采集时间段，根据所述光电转换元件的第二极的电压，能够进行指纹识别。
  15. 如权利要求14所述的指纹识别检测方法，其中，所述指纹识别检测电路还包括开关控制电路和放电电压端；所述指纹识别检测方法还包括：
    在残影消除阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电容的第二端与所述光电转换元件的第二极之间断开；
    在所述残影消除阶段，电压提供电路为光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与放电电压端电连接，以将所述光电转换元件中的电荷释放至所述放电电压端。
  16. 如权利要求13所述的指纹识别检测方法，其中，当环境光的亮度小于或等于预定亮度时，指纹识别检测阶段包括依次设置的复位时间段、积分时间段和采集时间段；所述指纹识别检测方法包括：
    在所述指纹识别检测阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电容的第二端与所述光电转换元件的第二极之间断开；电压提供电路为光电转换元件的第一极提供第一偏置控制电压，以控制所述光电转换元件处于光电转换状态；
    在所述复位时间段，控制光电转换元件的第二极接入参考电压；
    在所述积分时间段，所述光电转换元件将接收到的光信号转换为相应的电信号，并通过该电信号为所述存储电容充电，以改变所述光电转换元件的第二极的电压；
    在所述采集时间段，根据所述光电转换元件的第二极的电压，能够进行指纹识别。
  17. 如权利要求16所述的指纹识别检测方法，其中，所述指纹识别检测电路还包括开关控制电路和放电电压端；所述指纹识别检测方法还包括：
    在残影消除阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电容的第二端与所述光电转换元件的第二极之间断开；
    在所述残影消除阶段，电压提供电路为光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与放电电压端电连接，以将所述光电转换元件中的电荷释放至所述放电电压端。
  18. 如权利要求14或16所述的指纹识别检测方法，其中，所述指纹识别检测电路还包括开关控制电路、积分运算放大器、积分电容和放电开关；
    所述积分时间段包括积分复位子时间段；所述指纹识别检测方法还包括：在所述积分复位子时间段，所述放电开关在放电控制信号的控制下，控制所述积分运算放大器的正相输入端与所述积分运算放大器的输出端之间连通；在所述指纹识别检测阶段包括的除了所述积分复位子时间段之外的时间段，所述放电开关在放电控制信号的控制下，控制所述积分运算放大器的正相输入端与所述积分运算放大器的输出端之间断开；
    所述在所述复位时间段，控制光电转换元件的第二极接入参考电压步骤包括：所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间连通，以控制光电转换元件的第二极接入参考电压；
    所述指纹识别检测方法还包括：
    在所述积分时间段，所述开关控制电路在开关控制信号的控制下，控制 所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间断开；
    在所述采集时间段，所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间连通，以将存储电容中存储的电荷导入所述积分运算放大器，以相应改变所述积分运算放大器的输出端的电压，根据该电压能够进行指纹识别。
  19. 如权利要求17所述的指纹识别检测方法，其中，还包括：
    在残影消除阶段，电容控制电路在电容控制信号的控制下，控制所述存储电容的第一端与所述光电转换元件的第一极之间断开，并控制所述存储电容的第二端与所述光电转换元件的第二极之间断开；
    在所述残影消除阶段，电压提供电路为光电转换元件的第一极提供第二偏置控制电压，以控制所述光电转换元件处于正向偏置状态，所述放电开关在放电控制信号的控制下，控制所述积分运算放大器的正相输入端与所述积分运算放大器的输出端之间导通，所述开关控制电路在开关控制信号的控制下，控制所述光电转换元件的第二极与所述积分运算放大器的正相输入端之间连通，以释放所述光电转换元件中的电荷。
  20. 一种显示装置，包括如权利要求1至11中任一权利要求所述的指纹识别检测电路。
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