WO2023141765A1 - 光电流放大电路、放大控制方法、光检测模组和显示装置 - Google Patents

光电流放大电路、放大控制方法、光检测模组和显示装置 Download PDF

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WO2023141765A1
WO2023141765A1 PCT/CN2022/073824 CN2022073824W WO2023141765A1 WO 2023141765 A1 WO2023141765 A1 WO 2023141765A1 CN 2022073824 W CN2022073824 W CN 2022073824W WO 2023141765 A1 WO2023141765 A1 WO 2023141765A1
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circuit
terminal
control
voltage
electrically connected
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PCT/CN2022/073824
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English (en)
French (fr)
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殷新社
赵辉
韩新斌
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京东方科技集团股份有限公司
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Priority to CN202280000064.4A priority Critical patent/CN117099151A/zh
Priority to PCT/CN2022/073824 priority patent/WO2023141765A1/zh
Publication of WO2023141765A1 publication Critical patent/WO2023141765A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]

Definitions

  • the present disclosure relates to the technical field of light detection, and in particular to a photocurrent amplification circuit, an amplification control method, a light detection module and a display device.
  • AI Artificial Intelligence, artificial intelligence
  • the customer's application in a specific environment can be customized to increase the user's experience in different environments, so it is necessary Monitor the user's environment at any time.
  • TFT thin film transistor
  • the characteristics of TFT can be used to make an ambient light sensor on the display screen, and the light leakage current signal generated by the photoelectric sensor made of thin film inducting the light signal is pA level. It is difficult to sample and detect the light leakage current signal by an external sampling circuit, and it is necessary to amplify the pA level current to nA or uA level.
  • an embodiment of the present disclosure provides a photocurrent amplification circuit, including a photoelectric sensor, a compensation circuit, a reset circuit, an energy storage circuit, and a drive circuit, wherein,
  • the photoelectric sensor is used to sense a light signal, convert the light signal into a photocurrent signal, and provide the photocurrent signal to the control terminal of the driving circuit;
  • the compensation circuit is electrically connected to the compensation control terminal, the control terminal of the drive circuit and the first terminal of the drive circuit, and is used to control the drive under the control of the compensation control signal provided by the compensation control line.
  • the control terminal of the circuit communicates with the first terminal of the drive circuit;
  • the reset circuit is electrically connected to the reset control terminal, the first voltage terminal and the control terminal of the driving circuit respectively, and is used to control the first voltage terminal and the control terminal under the control of the reset control signal provided by the reset control terminal.
  • the control terminals of the drive circuit are connected;
  • the first end of the energy storage circuit is electrically connected to the control terminal of the drive circuit, the second end of the energy storage circuit is electrically connected to the second end of the drive circuit, and the energy storage circuit is used to store electric energy ;
  • the second terminal of the driving circuit is electrically connected to the second voltage terminal, and the driving circuit is used to generate the first voltage flowing through the second terminal of the driving circuit and the first voltage terminal of the driving circuit under the control of the potential of the control terminal.
  • the amplified photocurrent signal at the terminal is used to generate the first voltage flowing through the second terminal of the driving circuit and the first voltage terminal of the driving circuit under the control of the potential of the control terminal.
  • the photocurrent amplifying circuit described in at least one embodiment of the present disclosure further includes a sampling control circuit
  • the sampling control circuit is electrically connected to the sampling control terminal, the first terminal of the driving circuit and the sampling output terminal, and is used to control the first terminal of the driving circuit under the control of the sampling control signal provided by the sampling control terminal.
  • One end is connected to the sampling output end, so as to output the amplified photocurrent signal through the sampling output end.
  • the compensation circuit includes a first transistor, and the reset circuit includes a second transistor;
  • the control pole of the first transistor is electrically connected to the compensation control terminal, the first pole of the first transistor is electrically connected to the control terminal of the driving circuit, and the second pole of the first transistor is electrically connected to the driving circuit. the first end of the circuit is electrically connected;
  • the control pole of the second transistor is electrically connected to the reset control terminal, the first pole of the second transistor is electrically connected to the first voltage terminal, and the second pole of the second transistor is electrically connected to the drive circuit
  • the control terminal is electrically connected.
  • the energy storage circuit includes a storage capacitor
  • the drive circuit includes a drive transistor
  • the control terminal of the driving transistor is the control terminal of the driving circuit
  • the first terminal of the driving transistor is the first terminal of the driving circuit
  • the second terminal of the driving transistor is the second terminal of the driving circuit
  • the first end of the storage capacitor is electrically connected to the control electrode of the driving transistor, and the second end of the storage capacitor is electrically connected to the second electrode of the driving transistor.
  • the photoelectric sensor is a photodiode
  • the anode of the photodiode is electrically connected to the first voltage terminal, and the cathode of the photodiode is electrically connected to the control terminal of the driving circuit.
  • the sampling control circuit includes a third transistor
  • the control electrode of the third transistor is electrically connected to the sampling control terminal, the first electrode of the third transistor is electrically connected to the first end of the driving circuit, and the second electrode of the third transistor is electrically connected to the The sampling output terminal is electrically connected.
  • the embodiment of the present disclosure provides an amplification control method, which is applied to the above-mentioned photocurrent amplification circuit, and the working cycle includes a reset phase, a compensation phase, a discharge phase, and a sampling phase set successively;
  • the amplification control method include:
  • the reset circuit In the reset phase, under the control of the reset control signal, the reset circuit writes the first voltage signal provided by the first voltage terminal into the control terminal of the driving circuit, so that when the compensation phase starts, the driving circuit can Under the control of the potential of the control terminal, control the communication between the first terminal of the driving circuit and the second terminal of the driving circuit;
  • the compensation circuit controls the communication between the control terminal of the driving circuit and the first terminal of the driving circuit under the control of the compensation control signal;
  • the drive circuit under the control of the potential of its control terminal, controls the communication between the first terminal of the drive circuit and the second terminal of the drive circuit, so that the voltage provided by the second voltage terminal
  • the second voltage signal charges the energy storage circuit until the drive circuit disconnects the connection between its first terminal and the second terminal of the drive circuit, the potential of the control terminal of the drive circuit is V2-Vth, and V2 is The voltage value of the second voltage signal, Vth is the absolute value of the threshold voltage of the drive transistor included in the drive circuit;
  • the photoelectric sensor senses the light signal, converts the light signal into a photocurrent signal, discharges the energy storage circuit through the photocurrent signal, and then changes the potential of the control terminal of the driving circuit;
  • the drive circuit In the sampling phase, the drive circuit generates an amplified photocurrent signal flowing from the second end of the drive circuit to the first end of the drive circuit under the control of the potential control end of the drive circuit, and passes through the first end of the drive circuit. One end outputs the amplified photocurrent signal.
  • the photoelectric sensor is a photodiode; the anode of the photodiode is electrically connected to the first voltage terminal, and the cathode of the photodiode is electrically connected to the control terminal of the driving circuit; the driving circuit includes drive transistor;
  • VR V2-Vth-DV-V1; VR is greater than 0;
  • V1 is the voltage value of the first voltage signal
  • V2 is the voltage value of the second voltage signal
  • VR is the reverse bias voltage of the photodiode at the end of the discharge phase
  • Vth is the The threshold voltage of the driving transistor, DV, is the variation of the potential of the control terminal of the driving circuit during the discharge phase.
  • the photocurrent amplification circuit also includes a sampling control circuit; the amplification control method described in at least one embodiment of the present disclosure also includes:
  • the sampling control circuit controls the connection between the first end of the driving circuit and the sampling output end under the control of the sampling control signal, so as to output the amplified photocurrent signal through the sampling output end .
  • an embodiment of the present disclosure provides a light detection module, including the above-mentioned photocurrent amplification circuit, conversion circuit and detection circuit;
  • the conversion circuit is electrically connected to the photocurrent amplifying circuit, and is used to convert the amplified photocurrent signal output by the photocurrent amplifying circuit into an analog output voltage, and output the analog output voltage through an analog output voltage output terminal;
  • the detection circuit is used to obtain the characteristics of the light signal sensed by the photosensor included in the photocurrent amplification circuit according to the analog output voltage.
  • the light detection module according to at least one embodiment of the present disclosure further includes a filter circuit
  • the filter circuit is connected between the output terminal of the analog output voltage and the detection circuit, and is used to filter out high-frequency noise in the analog output voltage, and provide the analog output voltage after filtering out the high-frequency noise to the detection circuit;
  • the detection circuit is used to obtain the characteristics of the optical signal according to the analog output voltage after filtering the high-frequency noise.
  • the detection circuit includes an analog-to-digital converter and an output processing unit;
  • the analog-to-digital converter is used to convert the analog output voltage into a digital output voltage;
  • the output processing unit is electrically connected to the analog-to-digital converter, and is used to receive the digital output voltage, and according to the digital output voltage The characteristics of the optical signal are obtained.
  • the conversion circuit includes an operational amplifier, a sampling resistor and a feedback capacitor; the photocurrent amplification circuit is used to output the amplified photocurrent signal through a sampling output terminal;
  • the non-inverting input terminal of the operational amplifier is electrically connected to the reference voltage terminal, the inverting input terminal of the operational amplifier is electrically connected to the sampling output terminal, and the output terminal of the operational amplifier is the analog output voltage output terminal;
  • the first end of the sampling resistor is electrically connected to the inverting input end of the operational amplifier, and the second end of the sampling resistor is electrically connected to the output end of the operational amplifier;
  • the first end of the feedback capacitor is electrically connected to the inverting input end of the operational amplifier, and the second end of the feedback capacitor is electrically connected to the output end of the operational amplifier.
  • an embodiment of the present disclosure provides a display device, including the above-mentioned light detection module.
  • the photocurrent amplification circuit included in the photodetection module is arranged on the display substrate, and the conversion circuit included in the photodetection module and the detection circuit included in the photodetection module are both arranged on the circuit board or display on the driver IC.
  • FIG. 1 is a structural diagram of a photocurrent amplifier circuit described in an embodiment of the present disclosure
  • Fig. 2 is a structural diagram of a photocurrent amplifier circuit according to at least one embodiment of the present disclosure
  • FIG. 3 is a circuit diagram of a photocurrent amplifier circuit according to at least one embodiment of the present disclosure.
  • FIG. 4 is a working timing diagram of at least one embodiment of the photocurrent amplifier circuit shown in FIG. 3 of the present disclosure
  • Fig. 5 is a structural diagram of a light detection module according to an embodiment of the present disclosure.
  • Fig. 6 is a structural diagram of a light detection module according to at least one embodiment of the present disclosure.
  • FIG. 7 is a structural diagram of a light detection module according to at least one embodiment of the present disclosure.
  • Fig. 8 is a structural diagram of a light detection module according to at least one embodiment of the present disclosure.
  • FIG. 9 is a circuit diagram of a light detection module according to at least one embodiment of the present disclosure.
  • FIG. 10 is a working sequence diagram of at least one embodiment of the light detection module shown in FIG. 9 of the present disclosure.
  • 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 pole is called the first pole, and the other pole is called the second pole.
  • the first pole when the transistor is a thin film transistor or a field effect transistor, the first pole may be a drain, and the second pole may be a source; or, the first pole may be a source, The second pole may be a drain.
  • the photocurrent amplifying circuit described in the embodiment of the present disclosure includes a photoelectric sensor Dw, a compensation circuit 11, a reset circuit 12, an energy storage circuit 13 and a drive circuit 14, wherein,
  • the photoelectric sensor Dw is electrically connected to the control terminal of the driving circuit 14, and is used to sense the light signal, convert the light signal into a photocurrent signal, and provide the photocurrent signal to the control terminal of the driving circuit 14.
  • the control terminal and the first end of the energy storage circuit 13 change the potential of the first end of the energy storage circuit 13 through the photocurrent signal;
  • the compensation circuit 11 is electrically connected to the compensation control terminal S0, the control terminal of the drive circuit 14, and the first terminal of the drive circuit 14, respectively, for being controlled by the compensation control signal provided by the compensation control line S0 , controlling the communication between the control terminal of the driving circuit 14 and the first terminal of the driving circuit 14, and connecting the driving transistors included in the driving circuit 14 in a diode form;
  • the reset circuit 12 is electrically connected to the reset control terminal R0, the first voltage terminal VT1 and the control terminal of the drive circuit 14, and is used to control the reset control signal provided by the reset control terminal R0.
  • the first voltage terminal VT1 is connected with the control terminal of the driving circuit 14;
  • the first end of the energy storage circuit 13 is electrically connected to the control end of the drive circuit 14, the second end of the energy storage circuit 13 is electrically connected to the second end of the drive circuit 14, and the energy storage circuit 13 for storing electrical energy;
  • the second terminal of the driving circuit 14 is electrically connected to the second voltage terminal VT2, and the driving circuit 14 is used to generate the second terminal and the driving voltage flowing through the driving circuit 14 under the control of the potential of its control terminal.
  • the first end of circuit 14 amplifies the photocurrent signal.
  • the photosensor may be a photodiode
  • the photocurrent signal may be a photoleakage current signal, but not limited thereto.
  • the light signal may be an ambient light signal, but not limited thereto; in actual operation, the light signal may also be an infrared light signal or other signals received by the photoelectric sensor light signal.
  • the driving circuit 14 may include a driving transistor, and the driving circuit 14 generates an amplified photocurrent signal under the control of the potential of its control terminal, which means: when the driving circuit 14 When the potential of the control terminal changes to enable the driving transistor included in the driving circuit 14 to be turned on, the driving circuit 14 generates the amplified photocurrent signal.
  • the first voltage terminal VT1 may be used to provide a low voltage
  • the second voltage terminal VT2 may be used to provide a high voltage, but not limited thereto.
  • the voltage value V1 of the first voltage signal provided by the first voltage terminal VT1 may be around -1V; for example, V1 may be greater than or equal to -2V and less than or equal to 0V;
  • the voltage value V2 of the second voltage signal provided by the second voltage terminal VT2 may be around 5V, for example, V2 may be greater than or equal to 4V and less than or equal to 6V;
  • Vth can be around 2V, for example, Vth can be greater than 1.5V but less than 2.5V;
  • Vth is the absolute value of the threshold voltage of the driving transistor.
  • the photocurrent amplification circuit described in the embodiments of the present disclosure can amplify the pA-level photocurrent signal converted by the photoelectric sensor to nA level or uA level for sampling and detection by an external circuit.
  • the photocurrent amplification circuit described in the embodiments of the present disclosure can improve the signal-to-noise ratio of the current signal on the detection channel by amplifying the photocurrent signal.
  • the external circuit may include a conversion circuit 41, a filter circuit 51, a digital-to-analog converter 61, and an output processing unit 62 in FIG.
  • the channel for transmitting the amplified photocurrent signal between the conversion circuits 41 the embodiment of the present disclosure transmits the amplified photocurrent signal to the conversion circuit 41 through the detection channel, which can improve the signal-to-noise ratio of the current signal on the detection channel.
  • the working cycle includes a reset phase, a compensation phase, a discharge phase, and a sampling phase that are successively set;
  • the reset circuit 12 writes the first voltage signal provided by the first voltage terminal VT1 into the control terminal of the driving circuit 14 under the control of the reset control signal, so that when the compensation phase starts, the The drive circuit 14 can control the communication between the first end of the drive circuit 14 and the second end of the drive circuit 14 under the control of the potential of its control terminal;
  • the compensation circuit 11 controls the communication between the control terminal of the driving circuit 14 and the first terminal of the driving circuit 14 under the control of the compensation control signal;
  • the driving circuit 14 controls the communication between the first terminal of the driving circuit 14 and the second terminal of the driving circuit 14 under the control of the potential of its control terminal, so as to pass through the second
  • the second voltage signal provided by the voltage terminal VT2 charges the energy storage circuit until the drive circuit 14 disconnects the connection between its first terminal and the second terminal of the drive circuit 14, and the control terminal of the drive circuit 14
  • the potential is V2-Vth
  • V2 is the voltage value of the second voltage signal
  • Vth is the absolute value of the threshold voltage of the driving transistor included in the driving circuit 14;
  • the photoelectric sensor Dw senses the light signal, and converts the light signal into a photocurrent signal, and discharges the energy storage circuit 13 through the photocurrent signal, changing the potential of the control terminal of the drive circuit 14;
  • the driving circuit 14 In the sampling phase, the driving circuit 14 generates an amplified photocurrent signal flowing from the second end of the driving circuit 14 to the first end of the driving circuit 14 under the control of the control terminal of the potential of the driving circuit 14, and passes through the driving circuit 14. The first terminal of the circuit 14 outputs the amplified photocurrent signal.
  • V1, V2 and Vth need to be set to ensure that the photoelectric sensor Dw can perform photoelectric conversion during the entire discharge phase.
  • the photocurrent amplifying circuit described in at least one embodiment of the present disclosure may further include a sampling control circuit 21;
  • the sampling control circuit 21 is electrically connected to the sampling control terminal S1, the first terminal of the driving circuit 14, and the sampling output terminal Do respectively, and is used to control the sampling control signal provided by the sampling control terminal S1.
  • the first terminal of the driving circuit 14 is connected to the sampling output terminal Do, so as to output the amplified photocurrent signal through the sampling output terminal Do.
  • the sampling control circuit 21 controls the first The terminal is connected with the sampling output terminal Do, so as to output the amplified photocurrent signal through the sampling output terminal Do.
  • the compensation circuit includes a first transistor, and the reset circuit includes a second transistor;
  • the control pole of the first transistor is electrically connected to the compensation control terminal, the first pole of the first transistor is electrically connected to the control terminal of the driving circuit, and the second pole of the first transistor is electrically connected to the driving circuit. the first end of the circuit is electrically connected;
  • the control pole of the second transistor is electrically connected to the reset control terminal, the first pole of the second transistor is electrically connected to the first voltage terminal, and the second pole of the second transistor is electrically connected to the drive circuit
  • the control terminal is electrically connected.
  • the energy storage circuit includes a storage capacitor
  • the drive circuit includes a drive transistor
  • the control terminal of the driving transistor is the control terminal of the driving circuit
  • the first terminal of the driving transistor is the first terminal of the driving circuit
  • the second terminal of the driving transistor is the second terminal of the driving circuit
  • the first end of the storage capacitor is electrically connected to the control electrode of the driving transistor, and the second end of the storage capacitor is electrically connected to the second electrode of the driving transistor.
  • the photoelectric sensor is a photodiode
  • the anode of the photodiode is electrically connected to the first voltage terminal, and the cathode of the photodiode is electrically connected to the control terminal of the driving circuit.
  • the sampling control circuit includes a third transistor
  • the control electrode of the third transistor is electrically connected to the sampling control terminal, the first electrode of the third transistor is electrically connected to the first end of the driving circuit, and the second electrode of the third transistor is electrically connected to the The sampling output terminal is electrically connected.
  • the compensation circuit 11 includes a first transistor T1, and the reset circuit 12 includes a second transistor T2; the driving Circuit 14 includes a drive transistor T0;
  • the gate of the first transistor T1 is electrically connected to the compensation control terminal S0, the drain of the first transistor T1 is electrically connected to the gate of the driving transistor T0, and the source of the first transistor T1 is electrically connected to the The drain of the driving transistor T0 is electrically connected;
  • the gate of the second transistor T2 is electrically connected to the reset control terminal R0, the drain of the second transistor T2 is electrically connected to the first voltage terminal VT1, and the source of the second transistor T2 is electrically connected to the drive
  • the gate of transistor T0 is electrically connected;
  • the energy storage circuit 13 includes a storage capacitor C1;
  • the first end of the storage capacitor C1 is electrically connected to the gate of the driving transistor T0, and the second end of the storage capacitor C1 is electrically connected to the source of the driving transistor T0;
  • the source of the driving transistor T0 is electrically connected to the second voltage terminal VT2;
  • the photoelectric sensor is a photodiode D1;
  • the anode of the photodiode D1 is electrically connected to the first voltage terminal VT1, and the cathode of the photodiode D1 is electrically connected to the gate of the driving transistor T0;
  • the sampling control circuit 21 includes a third transistor T3;
  • the gate of the third transistor T3 is electrically connected to the sampling control terminal S1
  • the source of the third transistor T3 is electrically connected to the source of the driving transistor T0
  • the drain of the third transistor T3 is electrically connected to the source of the driving transistor T0.
  • the sampling output terminal Do is electrically connected.
  • the voltage value V1 of the first voltage signal provided by the first voltage terminal VT1 may be -1V
  • the second voltage signal provided by the second voltage terminal VT2 The voltage value V2 of the voltage signal may be 5V
  • the absolute value Vth of the threshold voltage of the driving transistor T0 may be 2V, but not limited thereto.
  • the voltage value V1 of the first voltage signal, the voltage value V2 of the second voltage signal, and the absolute value Vth of the threshold voltage of the driving transistor T0 may also be other values, V1, V2
  • all transistors are p-type thin film transistors, but not limited thereto.
  • At least one embodiment of the photocurrent amplifying circuit shown in FIG. 3 of the present disclosure is working.
  • the photosensor is a photodiode D1
  • the photocurrent signal is a photoleakage current signal.
  • the working cycle includes a reset phase P1, a compensation phase P2, a discharge phase P3, and a sampling phase P4 that are set successively;
  • R0 provides a low voltage signal
  • S0 provides a high voltage signal
  • S1 provides a high voltage signal
  • S0 provides a low-voltage signal
  • R0 provides a high-voltage signal
  • S1 provides a high-voltage signal
  • T1 is turned on, so that T0 is connected in a diode form
  • the gate-source voltage Vgs of the driving transistor T0 is less than -Vth, the driving transistor T0 is turned on, and the second voltage terminal VT2 charges the storage capacitor C1 through the driving transistor T0,
  • the gate voltage of the driving transistor T0 starts to rise from V1, and when the gate voltage of the driving transistor T0 rises to V2-Vth, the driving transistor T0 is turned off, and the gate voltage of the driving transistor T0 is V2-Vth;
  • S0 provides a high-voltage signal
  • R0 provides a high-voltage signal
  • S1 provides a high-voltage signal
  • the photodiode D1 is in a reverse bias state, and the photodiode D1 generates a photocurrent signal, so
  • the photocurrent signal flows from the cathode of the photodiode D1 to the anode of the photodiode D1, discharges the storage capacitor C1, and changes the gate voltage of the driving transistor T0;
  • the reverse bias voltage VR of the photodiode D1 is equal to V2-Vth-DV-V1, and VR is greater than 0, so as to ensure that the photodiode D1 can always sense light during the discharge phase P3. signal to generate a corresponding photocurrent signal;
  • the drive current Id is the amplified photocurrent signal; wherein, ⁇ is the mobility rate of electrons, C OX is the gate oxide layer capacitance per unit area, is the width-to-length ratio of T0;
  • S1 provides a low voltage signal
  • both R0 and S0 provide a high voltage signal
  • T3 is turned on to output the amplified photocurrent signal through the sampling output terminal Do.
  • the amplified photocurrent signal has nothing to do with Vth, so the photocurrent amplifying circuit described in the embodiment of the present disclosure has a threshold voltage compensation function.
  • the amplification control method described in the embodiment of the present disclosure is applied to the above-mentioned photocurrent amplification circuit, and the working cycle includes successively set reset phase, compensation phase, discharge phase and sampling phase; the amplification control method includes:
  • the reset circuit In the reset phase, under the control of the reset control signal, the reset circuit writes the first voltage signal provided by the first voltage terminal into the control terminal of the driving circuit, so that when the compensation phase starts, the driving circuit can Under the control of the potential of the control terminal, control the communication between the first terminal of the driving circuit and the second terminal of the driving circuit;
  • the compensation circuit controls the communication between the control terminal of the driving circuit and the first terminal of the driving circuit under the control of the compensation control signal;
  • the drive circuit under the control of the potential of its control terminal, controls the communication between the first terminal of the drive circuit and the second terminal of the drive circuit, so that the voltage provided by the second voltage terminal
  • the second voltage signal charges the energy storage circuit until the drive circuit disconnects the connection between its first terminal and the second terminal of the drive circuit, the potential of the control terminal of the drive circuit is V2-Vth, and V2 is The voltage value of the second voltage signal, Vth is the absolute value of the threshold voltage of the drive transistor included in the drive circuit;
  • the photoelectric sensor senses the light signal, converts the light signal into a photocurrent signal, discharges the energy storage circuit through the photocurrent signal, and then changes the potential of the control terminal of the driving circuit;
  • the drive circuit In the sampling phase, the drive circuit generates an amplified photocurrent signal flowing from the second end of the drive circuit to the first end of the drive circuit under the control of the potential control end of the drive circuit, and passes through the first end of the drive circuit. One end outputs the amplified photocurrent signal.
  • the photocurrent amplification method described in the embodiments of the present disclosure can amplify the photocurrent signal converted by the photoelectric sensor, and can amplify the photocurrent signal of pA level to nA level or uA level for sampling and detection by an external circuit.
  • the photoelectric sensor is a photodiode; the anode of the photodiode is electrically connected to the first voltage terminal, and the cathode of the photodiode is electrically connected to the control terminal of the driving circuit; the driving circuit includes drive transistor;
  • VR V2-Vth-DV-V1; VR is greater than 0 to ensure that the photodiode is still in a reverse biased state at the end of the discharge phase;
  • V1 is the voltage value of the first voltage signal
  • V2 is the voltage value of the second voltage signal
  • VR is the reverse bias voltage of the photodiode at the end of the discharge phase
  • Vth is the The threshold voltage of the driving transistor, DV, is the variation of the potential of the control terminal of the driving circuit during the discharge phase.
  • the photocurrent amplification circuit further includes a sampling control circuit; the amplification control method further includes:
  • the sampling control circuit controls the connection between the first end of the driving circuit and the sampling output end under the control of the sampling control signal, so as to output the amplified photocurrent signal through the sampling output end .
  • the light detection module described in the embodiment of the present disclosure includes the above-mentioned photocurrent amplification circuit 40 , conversion circuit 41 and detection circuit 42 ;
  • the conversion circuit 41 is electrically connected to the photocurrent amplifying circuit 40, and is used to convert the amplified photocurrent signal output by the photocurrent amplifying circuit 40 into an analog output voltage, and output the analog output voltage through the analog output voltage output terminal O1.
  • the detection circuit 42 is electrically connected to the analog output voltage output terminal O1, and is used to obtain the characteristics of the light signal induced by the photoelectric sensor included in the photocurrent amplifier circuit 40 according to the analog output voltage.
  • the photodetection module may include a photocurrent amplification circuit 40, a conversion circuit 41 and a detection circuit 42, the conversion circuit 41 converts the amplified photocurrent signal into an analog output voltage, and the detection circuit 42 can convert the amplified photocurrent signal into an analog output voltage according to the The output voltage is simulated to obtain the characteristics of the corresponding optical signal.
  • the characteristics of the optical signal may include light intensity and brightness
  • the photosensor includes a red photodiode, a green photodiode and a blue photodiode (the red photodiode senses a red light signal, the green photodiode senses a green light signal, and the blue photodiode senses a blue light signal)
  • the red photodiode senses a red light signal
  • the green photodiode senses a green light signal
  • the blue photodiode senses a blue light signal
  • the photodetection module described in at least one embodiment of the present disclosure may further include a filter circuit 51 ;
  • the filter circuit 51 is connected between the analog output voltage output terminal O1 and the detection circuit 42, and is used to filter out the high-frequency noise in the analog output voltage, and output the analog output after filtering out the high-frequency noise A voltage is provided to the detection circuit 42;
  • the detection circuit 42 is used to obtain the characteristics of the optical signal according to the analog output voltage after filtering the high-frequency noise.
  • the detection circuit may include an analog-to-digital converter and an output processing unit;
  • the analog-to-digital converter is used to convert the analog output voltage into a digital output voltage
  • the output processing unit is electrically connected to the analog-to-digital converter, and is used for receiving the digital output voltage, and obtaining the characteristic of the optical signal according to the digital output voltage.
  • the detection circuit may include an analog-to-digital converter 61 and an output processing unit 62;
  • the analog-to-digital converter 61 is electrically connected to the filter circuit 51, and is used to convert the analog output voltage after the high-frequency noise is filtered into a digital output voltage;
  • the output processing unit 62 is electrically connected to the analog-to-digital converter 61 and configured to receive the digital output voltage and obtain the characteristics of the optical signal according to the digital output voltage.
  • the output processing unit may be an algorithm unit, which processes the output digital signal, judges the validity of the digital output voltage, and converts the digital output voltage into a digital value corresponding to light intensity and brightness. signal, and calculate the optical characteristic parameters such as color coordinates or color temperature according to the output digital signals corresponding to different colors, so as to meet the needs of the application unit.
  • the conversion circuit 41 includes an operational amplifier A1, a sampling resistor R1 and a feedback capacitor C; the photocurrent amplification circuit 40 For outputting the amplified photocurrent signal through the sampling output terminal Do;
  • the non-inverting input terminal of the operational amplifier A1 is electrically connected to the reference voltage terminal, the inverting input terminal of the operational amplifier A1 is electrically connected to the sampling output terminal Do, and the output terminal of the operational amplifier A1 is the analog output A voltage output terminal O1; the reference voltage terminal is used to provide a reference voltage Vref;
  • the first end of the sampling resistor R1 is electrically connected to the inverting input end of the operational amplifier A1, and the second end of the sampling resistor R1 is electrically connected to the output end of the operational amplifier A1;
  • the first terminal of the feedback capacitor C is electrically connected to the inverting input terminal of the operational amplifier A1, and the second terminal of the feedback capacitor C is electrically connected to the output terminal of the operational amplifier A1.
  • the photocurrent amplification circuit 40 includes a photoelectric sensor, a compensation circuit, a reset circuit, an energy storage circuit and a sampling control circuit;
  • the photoelectric sensor is a photodiode O1;
  • the compensation circuit includes a first transistor T1, the reset circuit includes a second transistor T2; the drive circuit 14 includes a drive transistor T0;
  • the gate of the first transistor T1 is electrically connected to the compensation control terminal S0, the drain of the first transistor T1 is electrically connected to the gate of the driving transistor T0, and the source of the first transistor T1 is electrically connected to the The drain of the driving transistor T0 is electrically connected;
  • the gate of the second transistor T2 is electrically connected to the reset control terminal R0, the drain of the second transistor T2 is electrically connected to the first voltage terminal VT1, and the source of the second transistor T2 is electrically connected to the drive
  • the gate of the transistor T0 is electrically connected; the first voltage terminal VT1 is used to provide a first voltage signal;
  • the energy storage circuit includes a storage capacitor C1;
  • the first end of the storage capacitor C1 is electrically connected to the gate of the driving transistor T0, and the second end of the storage capacitor C1 is electrically connected to the source of the driving transistor T0;
  • the source of the driving transistor T0 is electrically connected to the second voltage terminal VT2, and the second voltage terminal VT2 is used to provide a second voltage signal;
  • the anode of the photodiode D1 is electrically connected to the first voltage terminal VT1, and the cathode of the photodiode D1 is electrically connected to the gate of the driving transistor T0;
  • the sampling control circuit includes a third transistor T3;
  • the gate of the third transistor T3 is electrically connected to the sampling control terminal S1, the source of the third transistor T3 is electrically connected to the source of the driving transistor T0, and the drain of the third transistor T3 is electrically connected to the source of the driving transistor T0.
  • the sampling output terminal Do is electrically connected;
  • the filter circuit 51 includes a filter resistor R01, a first filter capacitor C01 and a second filter capacitor C02;
  • the first end of the filter resistor R01 is electrically connected to the analog output voltage output terminal O1, and the second end of the filter resistor R01 is electrically connected to the analog-to-digital converter 61;
  • the first terminal of the first filter capacitor C01 is electrically connected to the analog output voltage output terminal O1, and the second terminal of the first filter capacitor C01 is grounded;
  • the first end of the second filter capacitor C02 is electrically connected to the second end of the filter resistor R01 , and the second end of the second filter capacitor C02 is grounded.
  • the voltage value V1 of the first voltage signal provided by the first voltage terminal VT1 may be -1V
  • the second voltage signal provided by the second voltage terminal VT2 may be -1V
  • the voltage value V2 of the voltage signal may be 5V
  • the absolute value Vth of the threshold voltage of the driving transistor T0 may be 2V, but not limited thereto.
  • T1, T2, T3 and T0 are all made of LTPS (Low Temperature Poly-silicon, low temperature polysilicon) PMOS (P-type metal-oxide-semiconductor) process fabricated thin film transistors, but only so far.
  • LTPS Low Temperature Poly-silicon, low temperature polysilicon
  • PMOS P-type metal-oxide-semiconductor
  • At least one embodiment of the light detection module shown in FIG. 9 of the present disclosure is working.
  • T3 is turned on, so as to output the amplified photocurrent signal to the operational amplifier A1 through the sampling output terminal Do.
  • the operational amplifier A1 converts the amplified photocurrent signal into an analog output voltage Vout;
  • R01, C01 and C02 filter the analog output voltage to obtain the filtered analog output voltage, and the modulus
  • the converter 61 performs analog-to-digital conversion on the filtered analog output voltage to obtain a digital output voltage;
  • the output processing unit 62 is electrically connected to the analog-to-digital converter 61 for receiving the digital output voltage, and according to The digital output voltage is characterized by the optical signal.
  • the working cycle includes a reset phase P1, a compensation phase P2, a discharge phase P3, and a sampling phase P4 that are set successively;
  • R0 provides a low-voltage signal
  • S0 provides a high-voltage signal
  • S1 provides a high-voltage signal
  • T2 is turned on
  • the first voltage signal provided by the first voltage terminal VT1 is written into the first terminal of C1, so that in At the beginning of the compensation phase P2, T0 can be turned on;
  • S0 provides a low-voltage signal
  • R0 provides a high-voltage signal
  • S1 provides a high-voltage signal
  • T1 is turned on.
  • V1 is less than V2-Vth (Vth is the absolute value of the threshold voltage of T0)
  • VT2 passes through T0 and T1 charges C1, and the gate voltage of T0 starts to rise from V1.
  • the charging time is long enough, when the gate voltage of T0 rises to V2-Vth, T0 is cut off, so at the end of the compensation phase P2, the gate of T0 The voltage is V2-Vth;
  • S0 provides a high-voltage signal
  • R0 provides a high-voltage signal
  • S1 provides a high-voltage signal.
  • the anode voltage of D1 is V1
  • the cathode voltage of D1 is V2-Vth.
  • V1 needs to be less than V2 -Vth;
  • the drive current Id is the amplified photocurrent signal; wherein, ⁇ is the mobility rate of electrons, C OX is the gate oxide layer capacitance per unit area, is the width-to-length ratio of T0;
  • the operational amplifier A1 converts the amplified photocurrent signal into an analog output voltage Vout; R01, C01 and C02 filter the analog output voltage to obtain a filtered analog output voltage, and the analog-to-digital converter 61 Perform analog-to-digital conversion on the filtered analog output voltage to obtain a digital output voltage; the output processing unit 62 is electrically connected to the analog-to-digital converter 61 for receiving the digital output voltage, and according to the digital output voltage The characteristics of the optical signal are obtained.
  • the display device described in the embodiment of the present disclosure includes the above-mentioned light detection module.
  • the photocurrent amplification circuit included in the photodetection module may be disposed on the display substrate, and the conversion circuit included in the photodetection module and the detection circuit included in the photodetection module may be They are all arranged on the circuit board or the display driving integrated circuit.
  • the display device 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

一种光电流放大电路、放大控制方法、光检测模组和显示装置。光电流放大电路具有阈值电压补偿功能，光电流放大电路包括光电传感器（Dw）、补偿电路（11）、复位电路（12）、储能电路（13）和驱动电路（14），光电传感器（Dw）用于感应光信号，并将光信号转换为光电流信号；补偿电路（11）在补偿控制信号的控制下，控制驱动电路（14）的控制端与驱动电路（14）的第一端之间连通；复位电路（12）在复位控制信号的控制下，控制第一电压端与驱动电路（14）的控制端之间连通；驱动电路（14）在其控制端的电位的控制下，产生流经驱动电路（14）的第二端和驱动电路（14）的第一端的放大光电流信号。能够将光电传感器（Dw）转换得到的光电流信号进行阈值电压补偿及放大，使得外部采样电路能够采集放大光电流信号。

Description

光电流放大电路、放大控制方法、光检测模组和显示装置 技术领域
本公开涉及光检测技术领域，尤其涉及一种光电流放大电路、放大控制方法、光检测模组和显示装置。
背景技术
随着AI(Artificial Intelligence，人工智能)技术在移动显示产品中广泛应用，其中根据用户在应用时的环境，定制客户在特定环境下的应用，以增加用户在不同环境下的体验感，所以需要随时监测用户使用时的环境。在现有的环境光检测模组中，可以在显示屏上利用TFT(薄膜晶体管)的特性来制作环境光传感器，用薄膜制作的光电传感器感应光信号而产生的光漏电流信号为pA级，外部采样电路采样检测所述光漏电流信号比较困难，需要将pA级电流放大到nA或uA级。
发明内容
在一个方面中，本公开实施例提供了一种光电流放大电路，包括光电传感器、补偿电路、复位电路、储能电路和驱动电路，其中，
所述光电传感器用于感应光信号，并将所述光信号转换为光电流信号，并将所述光电流信号提供至所述驱动电路的控制端；
所述补偿电路分别与补偿控制端、所述驱动电路的控制端和所述驱动电路的第一端电连接，用于在所述补偿控制线提供的补偿控制信号的控制下，控制所述驱动电路的控制端与所述驱动电路的第一端之间连通；
所述复位电路分别与复位控制端、第一电压端和所述驱动电路的控制端电连接，用于在所述复位控制端提供的复位控制信号的控制下，控制所述第一电压端与所述驱动电路的控制端之间连通；
所述储能电路的第一端与所述驱动电路的控制端电连接，所述储能电路的第二端与所述驱动电路的第二端电连接，所述储能电路用于储存电能；
所述驱动电路的第二端与第二电压端电连接，所述驱动电路用于在其控 制端的电位的控制下，产生流经所述驱动电路的第二端和所述驱动电路的第一端的放大光电流信号。
可选的，本公开至少一实施例所述的光电流放大电路还包括采样控制电路；
所述采样控制电路分别与采样控制端、所述驱动电路的第一端和采样输出端电连接，用于在所述采样控制端提供的采样控制信号的控制下，控制所述驱动电路的第一端与所述采样输出端之间连通，以通过所述采样输出端输出所述放大光电流信号。
可选的，所述补偿电路包括第一晶体管，所述复位电路包括第二晶体管；
所述第一晶体管的控制极与所述补偿控制端电连接，所述第一晶体管的第一极与所述驱动电路的控制端电连接，所述第一晶体管的第二极与所述驱动电路的第一端电连接；
所述第二晶体管的控制极与所述复位控制端电连接，所述第二晶体管的第一极与所述第一电压端电连接，所述第二晶体管的第二极与所述驱动电路的控制端电连接。
可选的，所述储能电路包括存储电容，所述驱动电路包括驱动晶体管；
所述驱动晶体管的控制极为所述驱动电路的控制端，所述驱动晶体管的第一极为所述驱动电路的第一端，所述驱动晶体管的第二极为所述驱动电路的第二端；
所述存储电容的第一端所述驱动晶体管的控制极电连接，所述存储电容的第二端与所述驱动晶体管的第二极电连接。
可选的，所述光电传感器为光电二极管；
所述光电二极管的阳极与所述第一电压端电连接，所述光电二极管的阴极与所述驱动电路的控制端电连接。
可选的，所述采样控制电路包括第三晶体管；
所述第三晶体管的控制极与所述采样控制端电连接，所述第三晶体管的第一极与所述驱动电路的第一端电连接，所述第三晶体管的第二极与所述采样输出端电连接。
在第二个方面中，本公开实施例提供一种放大控制方法，应用于上述的 光电流放大电路，工作周期包括先后设置的复位阶段、补偿阶段、放电阶段和采样阶段；所述放大控制方法包括：
在所述复位阶段，复位电路在复位控制信号的控制下，将第一电压端提供的第一电压信号写入驱动电路的控制端，以使得在所述补偿阶段开始时，所述驱动电路能够在其控制端的电位的控制下，控制所述驱动电路的第一端所述驱动电路的第二端之间连通；
在所述补偿阶段，补偿电路在补偿控制信号的控制下，控制所述驱动电路的控制端与所述驱动电路的第一端之间连通；
在所述补偿阶段开始时，所述驱动电路在其控制端的电位的控制下，控制所述驱动电路的第一端所述驱动电路的第二端之间连通，以通过第二电压端提供的第二电压信号为储能电路充电，直至所述驱动电路断开其第一端与所述驱动电路的第二端之间的连接，所述驱动电路的控制端的电位为V2-Vth，V2为所述第二电压信号的电压值，Vth为所述驱动电路包括的驱动晶体管的阈值电压的绝对值；
在放电阶段，光电传感器感应光信号，并将所述光信号转换为光电流信号，通过所述光电流信号为所述储能电路进行放电，进而改变所述驱动电路的控制端的电位；
在采样阶段，驱动电路在其控制端的电位的控制端的控制下，产生由所述驱动电路的第二端流向所述驱动电路的第一端的放大光电流信号，并通过所述驱动电路的第一端输出所述放大光电流信号。
可选的，所述光电传感器为光电二极管；所述光电二极管的阳极与所述第一电压端电连接，所述光电二极管的阴极与所述驱动电路的控制端电连接；所述驱动电路包括驱动晶体管；
VR＝V2-Vth-DV-V1；VR大于0；
其中，V1为所述第一电压信号的电压值，V2为所述第二电压信号的电压值，VR为在所述放电阶段结束时所述光电二极管的反向偏置电压，Vth为所述驱动晶体管的阈值电压，DV为在放电阶段，所述驱动电路的控制端的电位的变化量。
可选的，所述光电流放大电路还包括采样控制电路；本公开至少一实施 例所述的放大控制方法还包括：
在所述采样阶段，所述采样控制电路在采样控制信号的控制下，控制所述驱动电路的第一端与采样输出端之间连通，以通过所述采样输出端输出所述放大光电流信号。
在第三个方面中，本公开实施例提供一种光检测模组，包括上述的光电流放大电路、转换电路和检测电路；
所述转换电路与所述光电流放大电路电连接，用于将所述光电流放大电路输出的放大光电流信号转换为模拟输出电压，并通过模拟输出电压输出端输出所述模拟输出电压；
所述检测电路用于根据所述模拟输出电压得到所述光电流放大电路包括的光电传感器感应的光信号的特征。
可选的，本公开至少一实施例所述的光检测模组还包括滤波电路；
所述滤波电路连接于所述模拟输出电压输出端和所述检测电路之间，用于滤除所述模拟输出电压中的高频噪声，并将滤除高频噪声之后的模拟输出电压提供至所述检测电路；
所述检测电路用于根据所述滤除高频噪声之后的模拟输出电压，得到所述光信号的特征。
可选的，所述检测电路包括模数转换器和输出处理单元；
所述模数转换器用于将所述模拟输出电压转换为数字输出电压；所述输出处理单元与所述模数转换器电连接，用于接收所述数字输出电压，并根据所述数字输出电压得到所述光信号的特征。
可选的，所述转换电路包括运算放大器、采样电阻和反馈电容；所述光电流放大电路用于通过采样输出端输出所述放大光电流信号；
所述运算放大器的正相输入端与参考电压端电连接，所述运算放大器的反相输入端与所述采样输出端电连接，所述运算放大器的输出端为所述模拟输出电压输出端；
所述采样电阻的第一端与所述运算放大器的反相输入端电连接，所述采样电阻的第二端与所述运算放大器的输出端电连接；
所述反馈电容的第一端与所述运算放大器的反相输入端电连接，所述反 馈电容的第二端与所述运算放大器的输出端电连接。
在第四个方面中，本公开实施例提供一种显示装置，包括上述的光检测模组。
可选的，所述光检测模组包括的光电流放大电路设置于显示基板上，所述光检测模组包括的转换电路和所述光检测模组包括的检测电路都设置于线路板或显示驱动集成电路上。
附图说明
图1是本公开实施例所述的光电流放大电路的结构图；
图2是本公开至少一实施例所述的光电流放大电路的结构图；
图3是本公开至少一实施例所述的光电流放大电路的电路图；
图4是本公开如图3所示的光电流放大电路的至少一实施例的工作时序图；
图5是本公开实施例所述的光检测模组的结构图；
图6是本公开至少一实施例所述的光检测模组的结构图；
图7是本公开至少一实施例所述的光检测模组的结构图；
图8是本公开至少一实施例所述的光检测模组的结构图；
图9是本公开至少一实施例所述的光检测模组的电路图；
图10是本公开如图9所示的光检测模组的至少一实施例的工作时序图。
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，当所述晶体管为薄膜晶体管或场效应管时，所述第一极 可以为漏极，所述第二极可以为源极；或者，所述第一极可以为源极，所述第二极可以为漏极。
如图1所示，本公开实施例所述的光电流放大电路包括光电传感器Dw、补偿电路11、复位电路12、储能电路13和驱动电路14，其中，
所述光电传感器Dw与所述驱动电路14的控制端电连接，用于感应光信号，并将所述光信号转换为光电流信号，并将所述光电流信号提供至所述驱动电路14的控制端和所述储能电路13的第一端，通过所述光电流信号改变所述储能电路13的第一端的电位；
所述补偿电路11分别与补偿控制端S0、所述驱动电路14的控制端和所述驱动电路14的第一端电连接，用于在所述补偿控制线S0提供的补偿控制信号的控制下，控制所述驱动电路14的控制端与所述驱动电路14的第一端之间连通，将所述驱动电路14包括的驱动晶体管连接成二极管形式；
所述复位电路12分别与复位控制端R0、第一电压端VT1和所述驱动电路14的控制端电连接，用于在所述复位控制端R0提供的复位控制信号的控制下，控制所述第一电压端VT1与所述驱动电路14的控制端之间连通；
所述储能电路13的第一端与所述驱动电路14的控制端电连接，所述储能电路13的第二端与所述驱动电路14的第二端电连接，所述储能电路13用于储存电能；
所述驱动电路14的第二端与第二电压端VT2电连接，所述驱动电路14用于在其控制端的电位的控制下，产生流经所述驱动电路14的第二端和所述驱动电路14的第一端的放大光电流信号。
在本公开至少一实施例中，所述光电传感器可以为光电二极管，所述光电流信号可以为光漏电流信号，但不以此为限。
在本公开至少一实施例中，所述光信号可以为环境光信号，但不以此为限；在实际操作时，所述光信号也可以为红外光信号或其他的所述光电传感器接收到的光信号。
在本公开至少一实施例中，所述驱动电路14可以包括驱动晶体管，所述驱动电路14在其控制端的电位的控制下，产生放大光电流信号指的可以是：当所述驱动电路14的控制端的电位变化至能够使得所述驱动电路14包括的 驱动晶体管导通时，所述驱动电路14产生所述放大光电流信号。
可选的，所述第一电压端VT1可以用于提供低电压，所述第二电压端VT2可以用于提供高电压，但不以此为限。
在本公开至少一实施例中，所述第一电压端VT1提供的第一电压信号的电压值V1可以在-1V左右；例如，V1可以大于或等于-2V而小于或等于0V；
所述第二电压端VT2提供的第二电压信号的电压值V2可以在5V左右，例如，V2可以大于或等于4V而小于或等于6V；
Vth可以在2V左右，例如，Vth可以大于1.5V而小于2.5V；
其中，Vth为所述驱动晶体管的阈值电压的绝对值。
本公开实施例所述的光电流放大电路能够将所述光电传感器转换得到的pA级光电流信号进行放大到nA级或uA级，供外部电路采样检测。本公开实施例所述的光电流放大电路通过对光电流信号进行放大，从而能够提升检测通道上的电流信号的信噪比。
在本公开至少一实施例中，所述外部电路可以包括图9中的转换电路41、滤波电路51、数模转换器61和输出处理单元62，检测通道可以为光电流放大电路40与所述转换电路41之间的传输放大光电流信号的通道，本公开实施例将放大光电流信号通过所述检测通道传输至转换电路41，能够提升检测通道上的电流信号的信噪比。
本公开图1所示的光电流放大电路的实施例在工作时，工作周期包括先后设置的复位阶段、补偿阶段、放电阶段和采样阶段；
在所述复位阶段，复位电路12在复位控制信号的控制下，将第一电压端VT1提供的第一电压信号写入驱动电路14的控制端，以使得在所述补偿阶段开始时，所述驱动电路14能够在其控制端的电位的控制下，控制所述驱动电路14的第一端所述驱动电路14的第二端之间连通；
在所述补偿阶段，补偿电路11在补偿控制信号的控制下，控制所述驱动电路14的控制端与所述驱动电路14的第一端之间连通；
在所述补偿阶段开始时，所述驱动电路14在其控制端的电位的控制下，控制所述驱动电路14的第一端与所述驱动电路14的第二端之间连通，以通过第二电压端VT2提供的第二电压信号为储能电路充电，直至所述驱动电路 14断开其第一端与所述驱动电路14的第二端之间的连接，所述驱动电路14的控制端的电位为V2-Vth，V2为所述第二电压信号的电压值，Vth为所述驱动电路14包括的驱动晶体管的阈值电压的绝对值；
在放电阶段，光电传感器Dw感应光信号，并将所述光信号转换为光电流信号，通过所述光电流信号为所述储能电路13进行放电，改变所述驱动电路14的控制端的电位；
在采样阶段，驱动电路14在其控制端的电位的控制端的控制下，产生由所述驱动电路14的第二端流向所述驱动电路14的第一端的放大光电流信号，并通过所述驱动电路14的第一端输出所述放大光电流信号。
在本公开至少一实施例中，需要通过设定V1、V2和Vth，以保证在整个所述放电阶段，所述光电传感器Dw都能够进行光电转换。
如图2所示，在图1所示的光电流放大电路的实施例的基础上，本公开至少一实施例所述的光电流放大电路还可以包括采样控制电路21；
所述采样控制电路21分别与采样控制端S1、所述驱动电路14的第一端和采样输出端Do电连接，用于在所述采样控制端S1提供的采样控制信号的控制下，控制所述驱动电路14的第一端与所述采样输出端Do之间连通，以通过所述采样输出端Do输出所述放大光电流信号。
本公开如图2所示的光电流放大电路的至少一实施例在工作时，在所述采样阶段，所述采样控制电路21在采样控制信号的控制下，控制所述驱动电路14的第一端与采样输出端Do之间连通，以通过所述采样输出端Do输出所述放大光电流信号。
可选的，所述补偿电路包括第一晶体管，所述复位电路包括第二晶体管；
所述第一晶体管的控制极与所述补偿控制端电连接，所述第一晶体管的第一极与所述驱动电路的控制端电连接，所述第一晶体管的第二极与所述驱动电路的第一端电连接；
所述第二晶体管的控制极与所述复位控制端电连接，所述第二晶体管的第一极与所述第一电压端电连接，所述第二晶体管的第二极与所述驱动电路的控制端电连接。
可选的，所述储能电路包括存储电容，所述驱动电路包括驱动晶体管；
所述驱动晶体管的控制极为所述驱动电路的控制端，所述驱动晶体管的第一极为所述驱动电路的第一端，所述驱动晶体管的第二极为所述驱动电路的第二端；
所述存储电容的第一端所述驱动晶体管的控制极电连接，所述存储电容的第二端与所述驱动晶体管的第二极电连接。
可选的，所述光电传感器为光电二极管；
所述光电二极管的阳极与所述第一电压端电连接，所述光电二极管的阴极与所述驱动电路的控制端电连接。
可选的，所述采样控制电路包括第三晶体管；
所述第三晶体管的控制极与所述采样控制端电连接，所述第三晶体管的第一极与所述驱动电路的第一端电连接，所述第三晶体管的第二极与所述采样输出端电连接。
如图3所示，在图2所示的光电流放大电路的至少一实施例的基础上，所述补偿电路11包括第一晶体管T1，所述复位电路12包括第二晶体管T2；所述驱动电路14包括驱动晶体管T0；
所述第一晶体管T1的栅极与所述补偿控制端S0电连接，所述第一晶体管T1的漏极与所述驱动晶体管T0的栅极电连接，所述第一晶体管T1的源极与所述驱动晶体管T0的漏极电连接；
所述第二晶体管T2的栅极与所述复位控制端R0电连接，所述第二晶体管T2的漏极与第一电压端VT1电连接，所述第二晶体管T2的源极与所述驱动晶体管T0的栅极电连接；
所述储能电路13包括存储电容C1；
所述存储电容C1的第一端所述驱动晶体管T0的栅极电连接，所述存储电容C1的第二端与所述驱动晶体管T0的源极电连接；
所述驱动晶体管T0的源极与第二电压端VT2电连接；
所述光电传感器为光电二极管D1；
所述光电二极管D1的阳极与所述第一电压端VT1电连接，所述光电二极管D1的阴极与所述驱动晶体管T0的栅极电连接；
所述采样控制电路21包括第三晶体管T3；
所述第三晶体管T3的栅极与所述采样控制端S1电连接，所述第三晶体管T3的源极与所述驱动晶体管T0的源极电连接，所述第三晶体管T3的漏极与所述采样输出端Do电连接。
在图3所示的光电流放大电路的至少一实施例中，所述第一电压端VT1提供的第一电压信号的电压值V1可以为-1V，所述第二电压端VT2提供的第二电压信号的电压值V2可以为5V，所述驱动晶体管T0的阈值电压的绝对值Vth可以为2V，但不以此为限。
在实际操作时，所述第一电压信号的电压值V1、所述第二电压信号的电压值V2，以及，所述驱动晶体管T0的阈值电压的绝对值Vth也可以为其他值，V1、V2和Vth的取值需要满足VR＝V2-Vth-DV-V1，VR大于0的条件。
在图3所示的光电流放大电路的至少一实施例中，所有的晶体管都为p型薄膜晶体管，但不以此为限。
本公开如图3所示的光电流放大电路的至少一实施例在工作时，为了确保在放电阶段，所述光电二极管D1能够一直进行光电转换，VR需要大于0，VR＝V2-Vth-DV-V1；其中，VR为在所述放电阶段结束时所述光电二极管D1的反向偏置电压；DV为在放电阶段，所述驱动晶体管T0的栅极的电位的变化量，DV大于0。
在图3所示的光电流放大电路的至少一实施例中，所述光电传感器为光电二极管D1，所述光电流信号为光漏电流信号。
如图4所示，本公开如图3所示的光电流放大电路的至少一实施例在工作时，工作周期包括先后设置的复位阶段P1、补偿阶段P2、放电阶段P3和采样阶段P4；
在复位阶段P1，R0提供低电压信号，S0提供高电压信号，S1提供高电压信号，T2导通，第一电压信号写入T0的栅极和C1的第一端；由于V1小于V2-Vth-DV，在补偿阶段P2开始时，所述驱动晶体管T0的栅源电压Vgs＝V1-V2<-Vth-DV<-Vth，确保在补偿阶段P2开始时，所述驱动晶体管T0能够导通；
在补偿阶段P2，S0提供低电压信号，R0提供高电压信号，S1提供高电压信号，T1导通，使得T0连接成二极管形式；
在所述补偿阶段P2开始时，所述驱动晶体管T0的栅源电压Vgs小于-Vth，所述驱动晶体管T0导通，第二电压端VT2通过所述驱动晶体管T0向所述存储电容C1充电，所述驱动晶体管T0的栅极电压从V1开始上升，当所述驱动晶体管T0的栅极电压上升至V2-Vth时，所述驱动晶体管T0截止，此时所述驱动晶体管T0的栅极电压为V2-Vth；在放电阶段P3，S0提供高电压信号，R0提供高电压信号，S1提供高电压信号，所述光电二极管D1处于反向偏置状态，所述光电二极管D1产生光电流信号，所述光电流信号由所述光电二极管D1的阴极流向所述光电二极管D1的阳极，对所述存储电容C1放电，改变所述驱动晶体管T0的栅极电压；
在放电阶段P3结束时，所述光电二极管D1的反向偏置电压VR等于V2-Vth-DV-V1，VR大于0，以保证在所述放电阶段P3，所述光电二极管D1一直能感应光信号，以产生相应的光电流信号；
在放电阶段P3，T1和T2关闭，光电二极管D1感应光信号，并将所述光信号转换为光电流信号IDR，以向C1放电，设定放电时间为T，则放电电荷ΔQ＝IDR×T；C1上的电荷变化量为Qc，Qc＝C1z(V2-Vth-V2)-IDR×T＝-C1z×Vth-IDR×T；其中，C1z为C1的电容值；存储电容C1经过放电后，存储电容C1两端的电压Vc＝(-C1z×Vth-IDR)×T/C1z＝-Vth-IDR×T/C1z；其中，Vc为C1的第一端的电位与C2的第一端的电位的差值；
在采样阶段P4，经过放电后，T0的栅源电压Vgs＝Vc＝-Vth-IDR×T/C1z，驱动晶体管T0的驱动电流
Figure PCTCN2022073824-appb-000001
所述驱动电流Id即为放大光电流信号；其中，μ为电子的迁移速率，C OX为单位面积栅氧化层电容，
Figure PCTCN2022073824-appb-000002
为T0的宽长比；
在采样阶段P4，S1提供低电压信号，R0和S0都提供高电压信号，T3打开，以通过所述采样输出端Do输出所述放大光电流信号。
由上可知，在采样阶段P4，所述放大光电流信号与Vth无关，因此本公开实施例所述的光电流放大电路具有阈值电压补偿功能。
本公开实施例所述的放大控制方法，应用于上述的光电流放大电路，工作周期包括先后设置的复位阶段、补偿阶段、放电阶段和采样阶段；所述放 大控制方法包括：
在所述复位阶段，复位电路在复位控制信号的控制下，将第一电压端提供的第一电压信号写入驱动电路的控制端，以使得在所述补偿阶段开始时，所述驱动电路能够在其控制端的电位的控制下，控制所述驱动电路的第一端所述驱动电路的第二端之间连通；
在所述补偿阶段，补偿电路在补偿控制信号的控制下，控制所述驱动电路的控制端与所述驱动电路的第一端之间连通；
在所述补偿阶段开始时，所述驱动电路在其控制端的电位的控制下，控制所述驱动电路的第一端所述驱动电路的第二端之间连通，以通过第二电压端提供的第二电压信号为储能电路充电，直至所述驱动电路断开其第一端与所述驱动电路的第二端之间的连接，所述驱动电路的控制端的电位为V2-Vth，V2为所述第二电压信号的电压值，Vth为所述驱动电路包括的驱动晶体管的阈值电压的绝对值；
在放电阶段，光电传感器感应光信号，并将所述光信号转换为光电流信号，通过所述光电流信号为所述储能电路进行放电，进而改变所述驱动电路的控制端的电位；
在采样阶段，驱动电路在其控制端的电位的控制端的控制下，产生由所述驱动电路的第二端流向所述驱动电路的第一端的放大光电流信号，并通过所述驱动电路的第一端输出所述放大光电流信号。
本公开实施例所述的光电流放大方法能够将所述光电传感器转换得到的光电流信号进行放大，能够将pA级光电流信号放大到nA级或uA级，供外部电路采样检测。
可选的，所述光电传感器为光电二极管；所述光电二极管的阳极与所述第一电压端电连接，所述光电二极管的阴极与所述驱动电路的控制端电连接；所述驱动电路包括驱动晶体管；
VR＝V2-Vth-DV-V1；VR大于0，以保证在放电阶段结束时，所述光电二极管仍处于反向偏置状态；
其中，V1为所述第一电压信号的电压值，V2为所述第二电压信号的电压值，VR为在所述放电阶段结束时所述光电二极管的反向偏置电压，Vth为 所述驱动晶体管的阈值电压，DV为在放电阶段，所述驱动电路的控制端的电位的变化量。
在本公开至少一实施例中，所述光电流放大电路还包括采样控制电路；所述放大控制方法还包括：
在所述采样阶段，所述采样控制电路在采样控制信号的控制下，控制所述驱动电路的第一端与采样输出端之间连通，以通过所述采样输出端输出所述放大光电流信号。
如图5所示，本公开实施例所述的光检测模组包括上述的光电流放大电路40、转换电路41和检测电路42；
所述转换电路41与所述光电流放大电路40电连接，用于将所述光电流放大电路40输出的放大光电流信号转换为模拟输出电压，并通过模拟输出电压输出端O1输出所述模拟输出电压；
所述检测电路42与所述模拟输出电压输出端O1电连接，用于根据所述模拟输出电压得到所述光电流放大电路40包括的光电传感器感应的光信号的特征。
在具体实施时，所述光检测模组可以包括光电流放大电路40、转换电路41和检测电路42，所述转换电路41将放大光电流信号转换为模拟输出电压，检测电路42能够根据所述模拟输出电压得到相应的光信号的特征。
在本公开至少一实施例中，所述光信号的特征可以包括光强和亮度；
所述光电传感器包括红色光电二极管、绿色光电二极管和蓝色光电二极管时(所述红色光电二极管感应红色光信号，所述绿色光电二极管感应绿色光信号，所述蓝色光电二极管感应蓝色光信号)，通过红色光电二极管感应的红色光信号的特征、绿色光电二极管感应的绿色光信号的特征，以及，蓝色光电二极管感应的蓝色光信号的特征，可以计算出光信号的色坐标和色温等光特征，但不以此为限。
如图6所示，在图5所示的光检测模组的实施例的基础上，本公开至少一实施例所述的光检测模组还可以包括滤波电路51；
所述滤波电路51连接于所述模拟输出电压输出端O1和所述检测电路42之间，用于滤除所述模拟输出电压中的高频噪声，并将滤除高频噪声之后的 模拟输出电压提供至所述检测电路42；
所述检测电路42用于根据所述滤除高频噪声之后的模拟输出电压，得到所述光信号的特征。
在本公开至少一实施例中，所述检测电路可以包括模数转换器和输出处理单元；
所述模数转换器用于将所述模拟输出电压转换为数字输出电压；
所述输出处理单元与所述模数转换器电连接，用于接收所述数字输出电压，并根据所述数字输出电压得到所述光信号的特征。
如图7所示，在图6所示的光检测模组的至少一实施例的基础上，所述检测电路可以包括模数转换器61和输出处理单元62；
所述模数转换器61与所述滤波电路51电连接，用于将所述滤除高频噪声之后的模拟输出电压转换为数字输出电压；
所述输出处理单元62与所述模数转换器61电连接，用于接收所述数字输出电压，并根据所述数字输出电压得到所述光信号的特征。
在具体实施时，所述输出处理单元可以为算法单元，对所述输出数字信号进行处理，判断所述数字输出电压的有效性，将所述数字输出电压转换为对应于光强和亮度的数字信号，同时根据对应于不同颜色的输出数字信号计算色坐标或色温等光学特征参数，以满足应用单元使用。
如图8所示，在图7所示的光检测模组的至少一实施例的基础上，所述转换电路41包括运算放大器A1、采样电阻R1和反馈电容C；所述光电流放大电路40用于通过采样输出端Do输出所述放大光电流信号；
所述运算放大器A1的正相输入端与参考电压端电连接，所述运算放大器A1的反相输入端与所述采样输出端Do电连接，所述运算放大器A1的输出端为所述模拟输出电压输出端O1；所述参考电压端用于提供参考电压Vref；
所述采样电阻R1的第一端与所述运算放大器A1的反相输入端电连接，所述采样电阻R1的第二端与所述运算放大器A1的输出端电连接；
所述反馈电容C的第一端与所述运算放大器A1的反相输入端电连接，所述反馈电容C的第二端与所述运算放大器A1的输出端电连接。
本公开如图8所示的光检测模组的至少一实施例在工作时，O1输出的模 拟输出电压
Figure PCTCN2022073824-appb-000003
其中，R1z为R1的电阻值；A1的反相输入端的电压为Vref。
如图9所示，在图8所示的光检测模组的至少一实施例的基础上，所述光电流放大电路40包括光电传感器、补偿电路、复位电路、储能电路和采样控制电路；所述光电传感器为光电二极管O1；
所述补偿电路包括第一晶体管T1，所述复位电路包括第二晶体管T2；所述驱动电路14包括驱动晶体管T0；
所述第一晶体管T1的栅极与所述补偿控制端S0电连接，所述第一晶体管T1的漏极与所述驱动晶体管T0的栅极电连接，所述第一晶体管T1的源极与所述驱动晶体管T0的漏极电连接；
所述第二晶体管T2的栅极与所述复位控制端R0电连接，所述第二晶体管T2的漏极与第一电压端VT1电连接，所述第二晶体管T2的源极与所述驱动晶体管T0的栅极电连接；所述第一电压端VT1用于提供第一电压信号；
所述储能电路包括存储电容C1；
所述存储电容C1的第一端所述驱动晶体管T0的栅极电连接，所述存储电容C1的第二端与所述驱动晶体管T0的源极电连接；
所述驱动晶体管T0的源极与第二电压端VT2电连接，所述第二电压端VT2用于提供第二电压信号；
所述光电二极管D1的阳极与所述第一电压端VT1电连接，所述光电二极管D1的阴极与所述驱动晶体管T0的栅极电连接；
所述采样控制电路包括第三晶体管T3；
所述第三晶体管T3的栅极与所述采样控制端S1电连接，所述第三晶体管T3的源极与所述驱动晶体管T0的源极电连接，所述第三晶体管T3的漏极与所述采样输出端Do电连接；
所述滤波电路51包括滤波电阻R01、第一滤波电容C01和第二滤波电容C02；
所述滤波电阻R01的第一端与所述模拟输出电压输出端O1电连接，所述滤波电阻R01的第二端与模数转换器61电连接；
所述第一滤波电容C01的第一端与所述模拟输出电压输出端O1电连接， 所述第一滤波电容C01的第二端接地；
所述第二滤波电容C02的第一端与所述滤波电阻R01的第二端电连接，所述第二滤波电容C02的第二端接地。
在图9所示的光电检测模组的至少一实施例中，所述第一电压端VT1提供的第一电压信号的电压值V1可以为-1V，所述第二电压端VT2提供的第二电压信号的电压值V2可以为5V，所述驱动晶体管T0的阈值电压的绝对值Vth可以为2V，但不以此为限。
在图9所示的光检测模组的至少一实施例中，T1、T2、T3和T0都为由LTPS(Low Temperature Poly-silicon，低温多晶硅)PMOS(P型金属-氧化物-半导体)工艺制作的薄膜晶体管，但以此为限。
本公开如图9所示的光检测模组的至少一实施例在工作时，在采样阶段，T3打开，以通过所述采样输出端Do输出所述放大光电流信号至所述运算放大器A1的反向输入端，所述运算放大器A1将所述放大光电流信号转换为模拟输出电压Vout；R01、C01和C02对所述模拟输出电压进行滤波，得到滤波后的模拟输出电压，所述模数转换器61对所述滤波后的模拟输出电压进行模数转换，得到数字输出电压；所述输出处理单元62与所述模数转换器61电连接，用于接收所述数字输出电压，并根据所述数字输出电压得到所述光信号的特征。
如图10所示，本公开如图9所示的光检测模组的至少一实施例在工作时，工作周期包括先后设置的复位阶段P1、补偿阶段P2、放电阶段P3和采样阶段P4；
在复位阶段P1，R0提供低电压信号，S0提供高电压信号，S1提供高电压信号，T2导通，将第一电压端VT1提供的第一电压信号写入C1的第一端，以使得在补偿阶段P2开始时，T0能够导通；
在补偿阶段P2，S0提供低电压信号，R0提供高电压信号，S1提供高电压信号，T1导通，当V1小于V2-Vth(Vth为T0的阈值电压的绝对值)时，VT2通过T0和T1向C1充电，T0的栅极电压从V1开始上升，当充电时间足够长时，当T0的栅极电压上升至V2-Vth时，T0截止，因此在补偿阶段P2结束时，T0的栅极电压为V2-Vth；
在放电阶段P3，S0提供高电压信号，R0提供高电压信号，S1提供高电压信号，在放电阶段P3开始时，D1的阳极电压为V1，D1的阴极电压为V2-Vth，V1需要小于V2-Vth；
在放电阶段P3，T1和T2关闭，光电二极管D1感应光信号，并将所述光信号转换为光电流信号IDR，以向C1放电，设定放电时间为T，则放电电荷ΔQ＝IDR×T；C1上的电荷变化为Qc，Qc＝C1z(V2-Vth-V2)-IDR×T＝-C1z×Vth-IDR×T；其中，C1z为C1的电容值；存储电容C1经过放电后，存储电容C1两端的电压Vc＝(-C1z×Vth-IDR)×T/C1z＝-Vth-IDR×T/C1z；其中，Vc为C1的第一端的电位与C2的第一端的电位的差值；
在采样阶段P4，经过放电后，T0的栅源电压Vgs＝Vc＝-Vth-IDR×T/C1z，驱动晶体管T0的驱动电流
Figure PCTCN2022073824-appb-000004
所述驱动电流Id即为放大光电流信号；其中，μ为电子的迁移速率，C OX为单位面积栅氧化层电容，
Figure PCTCN2022073824-appb-000005
为T0的宽长比；
在采样阶段P4，为了保证驱动晶体管工作在饱和区，需要给T0一定的偏置电压Vbias，Vbias＝V2-Vref，Vbias大于0，使得T0的源极电压大于T0的漏极电压，使得放大系数大；
在采样阶段P4，S1提供低电压信号，R0和S0都提供高电压信号，T3打开，以通过所述采样输出端Do输出所述放大光电流信号至所述运算放大器A1的反向输入端，所述运算放大器A1将所述放大光电流信号转换为模拟输出电压Vout；R01、C01和C02对所述模拟输出电压进行滤波，得到滤波后的模拟输出电压，所述模数转换器61对所述滤波后的模拟输出电压进行模数转换，得到数字输出电压；所述输出处理单元62与所述模数转换器61电连接，用于接收所述数字输出电压，并根据所述数字输出电压得到所述光信号的特征。
本公开实施例所述的显示装置包括上述的光检测模组。
在本公开至少一实施例中，所述光检测模组包括的光电流放大电路可以设置于显示基板上，所述光检测模组包括的转换电路和所述光检测模组包括的检测电路可以都设置于线路板或显示驱动集成电路上。
本公开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优选实施方式，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 (15)

  1. 一种光电流放大电路，包括光电传感器、补偿电路、复位电路、储能电路和驱动电路，其中，
    所述光电传感器用于感应光信号，并将所述光信号转换为光电流信号，并将所述光电流信号提供至所述驱动电路的控制端；
    所述补偿电路分别与补偿控制端、所述驱动电路的控制端和所述驱动电路的第一端电连接，用于在所述补偿控制线提供的补偿控制信号的控制下，控制所述驱动电路的控制端与所述驱动电路的第一端之间连通；
    所述复位电路分别与复位控制端、第一电压端和所述驱动电路的控制端电连接，用于在所述复位控制端提供的复位控制信号的控制下，控制所述第一电压端与所述驱动电路的控制端之间连通；
    所述储能电路的第一端与所述驱动电路的控制端电连接，所述储能电路的第二端与所述驱动电路的第二端电连接，所述储能电路用于储存电能；
    所述驱动电路的第二端与第二电压端电连接，所述驱动电路用于在其控制端的电位的控制下，产生流经所述驱动电路的第二端和所述驱动电路的第一端的放大光电流信号。
  2. 如权利要求1所述的光电流放大电路，其中，还包括采样控制电路；
    所述采样控制电路分别与采样控制端、所述驱动电路的第一端和采样输出端电连接，用于在所述采样控制端提供的采样控制信号的控制下，控制所述驱动电路的第一端与所述采样输出端之间连通，以通过所述采样输出端输出所述放大光电流信号。
  3. 如权利要求1所述的光电流放大电路，其中，所述补偿电路包括第一晶体管，所述复位电路包括第二晶体管；
    所述第一晶体管的控制极与所述补偿控制端电连接，所述第一晶体管的第一极与所述驱动电路的控制端电连接，所述第一晶体管的第二极与所述驱动电路的第一端电连接；
    所述第二晶体管的控制极与所述复位控制端电连接，所述第二晶体管的第一极与所述第一电压端电连接，所述第二晶体管的第二极与所述驱动电路 的控制端电连接。
  4. 如权利要求1所述的光电流放大电路，其中，所述储能电路包括存储电容，所述驱动电路包括驱动晶体管；
    所述驱动晶体管的控制极为所述驱动电路的控制端，所述驱动晶体管的第一极为所述驱动电路的第一端，所述驱动晶体管的第二极为所述驱动电路的第二端；
    所述存储电容的第一端所述驱动晶体管的控制极电连接，所述存储电容的第二端与所述驱动晶体管的第二极电连接。
  5. 如权利要求1所述的光电流放大电路，其中，所述光电传感器为光电二极管；
    所述光电二极管的阳极与所述第一电压端电连接，所述光电二极管的阴极与所述驱动电路的控制端电连接。
  6. 如权利要求2所述的光电流放大电路，其中，所述采样控制电路包括第三晶体管；
    所述第三晶体管的控制极与所述采样控制端电连接，所述第三晶体管的第一极与所述驱动电路的第一端电连接，所述第三晶体管的第二极与所述采样输出端电连接。
  7. 一种放大控制方法，应用于如权利要求1至6中任一权利要求所述的光电流放大电路，工作周期包括先后设置的复位阶段、补偿阶段、放电阶段和采样阶段；所述放大控制方法包括：
    在所述复位阶段，复位电路在复位控制信号的控制下，将第一电压端提供的第一电压信号写入驱动电路的控制端，以使得在所述补偿阶段开始时，所述驱动电路能够在其控制端的电位的控制下，控制所述驱动电路的第一端所述驱动电路的第二端之间连通；
    在所述补偿阶段，补偿电路在补偿控制信号的控制下，控制所述驱动电路的控制端与所述驱动电路的第一端之间连通；
    在所述补偿阶段开始时，所述驱动电路在其控制端的电位的控制下，控制所述驱动电路的第一端所述驱动电路的第二端之间连通，以通过第二电压端提供的第二电压信号为储能电路充电，直至所述驱动电路断开其第一端与 所述驱动电路的第二端之间的连接，所述驱动电路的控制端的电位为V2-Vth，V2为所述第二电压信号的电压值，Vth为所述驱动电路包括的驱动晶体管的阈值电压的绝对值；
    在放电阶段，光电传感器感应光信号，并将所述光信号转换为光电流信号，通过所述光电流信号为所述储能电路进行放电，进而改变所述驱动电路的控制端的电位；
    在采样阶段，驱动电路在其控制端的电位的控制端的控制下，产生由所述驱动电路的第二端流向所述驱动电路的第一端的放大光电流信号，并通过所述驱动电路的第一端输出所述放大光电流信号。
  8. 如权利要求7所述的放大控制方法，其中，所述光电传感器为光电二极管；所述光电二极管的阳极与所述第一电压端电连接，所述光电二极管的阴极与所述驱动电路的控制端电连接；所述驱动电路包括驱动晶体管；
    VR＝V2-Vth-DV-V1；VR大于0；
    其中，V1为所述第一电压信号的电压值，V2为所述第二电压信号的电压值，VR为在所述放电阶段结束时所述光电二极管的反向偏置电压，Vth为所述驱动晶体管的阈值电压，DV为在放电阶段，所述驱动电路的控制端的电位的变化量。
  9. 如权利要求7或8所述的放大控制方法，其中，所述光电流放大电路还包括采样控制电路；所述放大控制方法还包括：
    在所述采样阶段，所述采样控制电路在采样控制信号的控制下，控制所述驱动电路的第一端与采样输出端之间连通，以通过所述采样输出端输出所述放大光电流信号。
  10. 一种光检测模组，包括如权利要求1至6中任一权利要求所述的光电流放大电路、转换电路和检测电路；
    所述转换电路与所述光电流放大电路电连接，用于将所述光电流放大电路输出的放大光电流信号转换为模拟输出电压，并通过模拟输出电压输出端输出所述模拟输出电压；
    所述检测电路用于根据所述模拟输出电压得到所述光电流放大电路包括的光电传感器感应的光信号的特征。
  11. 如权利要求10所述的光检测模组，其中，还包括滤波电路；
    所述滤波电路连接于所述模拟输出电压输出端和所述检测电路之间，用于滤除所述模拟输出电压中的高频噪声，并将滤除高频噪声之后的模拟输出电压提供至所述检测电路；
    所述检测电路用于根据所述滤除高频噪声之后的模拟输出电压，得到所述光信号的特征。
  12. 如权利要求10所述的光检测模组，其中，所述检测电路包括模数转换器和输出处理单元；
    所述模数转换器用于将所述模拟输出电压转换为数字输出电压；所述输出处理单元与所述模数转换器电连接，用于接收所述数字输出电压，并根据所述数字输出电压得到所述光信号的特征。
  13. 如权利要求10所述的光检测模组，其中，所述转换电路包括运算放大器、采样电阻和反馈电容；所述光电流放大电路用于通过采样输出端输出所述放大光电流信号；
    所述运算放大器的正相输入端与参考电压端电连接，所述运算放大器的反相输入端与所述采样输出端电连接，所述运算放大器的输出端为所述模拟输出电压输出端；
    所述采样电阻的第一端与所述运算放大器的反相输入端电连接，所述采样电阻的第二端与所述运算放大器的输出端电连接；
    所述反馈电容的第一端与所述运算放大器的反相输入端电连接，所述反馈电容的第二端与所述运算放大器的输出端电连接。
  14. 一种显示装置，包括如权利要求10至13中任一权利要求所述的光检测模组。
  15. 如权利要求14所述的显示装置，其中，所述光检测模组包括的光电流放大电路设置于显示基板上，所述光检测模组包括的转换电路和所述光检测模组包括的检测电路都设置于线路板或显示驱动集成电路上。
PCT/CN2022/073824 2022-01-25 2022-01-25 光电流放大电路、放大控制方法、光检测模组和显示装置 WO2023141765A1 (zh)

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