WO2022179153A1 - 像素电路及其驱动方法、显示面板和显示装置 - Google Patents

像素电路及其驱动方法、显示面板和显示装置 Download PDF

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Publication number
WO2022179153A1
WO2022179153A1 PCT/CN2021/126897 CN2021126897W WO2022179153A1 WO 2022179153 A1 WO2022179153 A1 WO 2022179153A1 CN 2021126897 W CN2021126897 W CN 2021126897W WO 2022179153 A1 WO2022179153 A1 WO 2022179153A1
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Prior art keywords
circuit
transistor
data signal
sub
light
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PCT/CN2021/126897
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English (en)
French (fr)
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袁长龙
徐映嵩
王晓宵
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京东方科技集团股份有限公司
成都京东方光电科技有限公司
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Priority to US17/914,192 priority Critical patent/US20230120335A1/en
Publication of WO2022179153A1 publication Critical patent/WO2022179153A1/zh

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    • 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
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Definitions

  • the present invention relates to the field of display technology, and in particular, to a pixel circuit and a driving method thereof, a display panel and a display device.
  • the light sensor is usually disposed under the display panel or in the frame area. In this way, it may be difficult to reduce the area of the frame area or the thickness of the display panel. In order to realize the optical detection function and at the same time realize a narrow frame or reduce the thickness of the display panel, the light sensor and the pixel circuit can be integrated together. The difficulty of circuit layout layout.
  • the present invention provides a pixel circuit and a driving method thereof, a display panel and a display device to solve the deficiencies in the related art.
  • a pixel circuit including:
  • a light-emitting control sub-circuit connected to the first voltage terminal, the data signal line and the light-emitting element
  • a photoelectric sensing electronic circuit connected to the first voltage terminal and the data signal line;
  • the data signal line is used to transmit a display data signal
  • the display data signal is used to control the light-emitting control sub-circuit to provide a driving current to the light-emitting element
  • the data signal line is used for transmitting the sensing data signal obtained by the photoelectric sensing electronic circuit.
  • the photosensitive electronic circuit includes a photosensitive element and a switch element, and the photosensitive element and the switch element are connected in series between the first voltage terminal and the data signal line;
  • the switching element is in an off state
  • the switching element is in a closed state.
  • the photosensitive element is a first transistor, and the first transistor is in an off state.
  • the photosensitive element is a diode, and the diode is in an off state.
  • the photoelectric sensor circuit further includes a first capacitor, and the first capacitor is connected in parallel with both ends of the diode, or the first capacitor is connected in parallel with both ends of the diode and the switching element .
  • the switching element is a second transistor.
  • the lighting control subcircuit includes a data writing subcircuit, a driving subcircuit and a reset subcircuit;
  • the data writing sub-circuit includes a data signal input terminal for receiving the display data signal and a first power signal input terminal for receiving a first power signal, the data writing sub-circuit is connected to the connection node, so the connection node is connected to the driving sub-circuit, and the data signal input terminal is connected to the data signal line;
  • the driving sub-circuit is connected to the first power signal input terminal and the light-emitting element, and is used for providing a driving current to the light-emitting element;
  • the light-emitting element is also connected to a second power supply signal input terminal for receiving a second power supply signal; the level of the second power supply signal is lower than the level of the first power supply signal;
  • the reset sub-circuit includes a reset control terminal for receiving a reset signal and a third power signal input terminal for receiving a third power signal, and the reset sub-circuit is connected to the connection node; The level is less than the level of the first power supply signal.
  • the first voltage terminal is used to provide the first power signal, and the first power signal input terminal is connected to the first voltage terminal;
  • the first electrode of the first transistor is connected to the first voltage terminal, the second electrode is connected to the data signal line through the switching element, the gate of the first transistor is connected to the first electrode, or,
  • the gate of the first transistor is connected to the second electrode, or,
  • the gate of the first transistor is used to input a turn-off signal, and the turn-off signal is used to control the first transistor to be in an off state.
  • the first voltage terminal is used to provide the second power signal, and the second power signal input terminal is connected to the first voltage terminal;
  • the first electrode of the first transistor is connected to the data signal line, the second electrode is connected to the first voltage terminal through the switch element, the gate of the first transistor is connected to the first electrode, or,
  • the gate of the first transistor is connected to the second electrode, or,
  • the gate of the first transistor is used to input a turn-off signal, and the turn-off signal is used to control the first transistor to be in an off state.
  • the first voltage terminal is used to provide the third power signal, and the third power signal input terminal is connected to the first voltage terminal;
  • the first electrode of the first transistor is connected to the data signal line, the second electrode is connected to the first voltage terminal through the switch element, the gate of the first transistor is connected to the first electrode, or,
  • the gate of the first transistor is connected to the second electrode, or,
  • the gate of the first transistor is used to input a turn-off signal, and the turn-off signal is used to control the first transistor to be in an off state.
  • the lighting control sub-circuit further includes a first lighting control sub-circuit and a second lighting control sub-circuit;
  • the first end of the first light-emitting control sub-circuit is connected to the first power signal input end, the second end is connected to the driving sub-circuit, and the control end is used for receiving the light-emitting control signal;
  • the first end of the second light-emitting control sub-circuit is connected to the driving sub-circuit, the second end is connected to the light-emitting element, and the control end is used for receiving the light-emitting control signal.
  • a display panel including the above-mentioned pixel circuit.
  • a method for driving a pixel circuit which is used for driving the above-mentioned pixel circuit, and the method includes:
  • the data signal line outputs a display data signal to the light-emitting control sub-circuit, so as to control the light-emitting control sub-circuit to provide a driving current to the light-emitting element;
  • the photoelectric sensing sub-circuit acquires the sensing data signal, and outputs the sensing data signal through the data signal line.
  • the photosensitive electronic circuit includes a photosensitive element and a switch element, the photosensitive element and the switch element are connected in series between the first voltage terminal and the data signal line; the photosensitive element is in In the off state, the photosensitive element is a first transistor or a diode; and in the second period of time, the photoelectric sensor circuit acquires the sensing data signal, including:
  • the photosensitive element When there is no light, the photosensitive element generates a dark current, and the dark current is the sensing data signal;
  • the photosensitive element When there is light, the photosensitive element also generates a photo-generated current, and the sensing data signal includes the dark current and the photo-generated current.
  • the photoelectric sensing electronic circuit for sensing external input is integrated in the pixel circuit, and is used to transmit the sensing data signal obtained by the photoelectric sensing electronic circuit when the data signal line does not transmit the display data signal
  • the photoelectric The sensing sub-circuit and the light-emitting control sub-circuit share the first voltage terminal. Therefore, there is no need to additionally provide a signal line for transmitting sensing data signals and a power supply for supplying power to the photoelectric sensing sub-circuit, which reduces the difficulty of circuit layout.
  • FIG. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram illustrating a test result of the first transistor being an N-type transistor according to an embodiment of the present invention
  • FIG. 9 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention.
  • FIG. 10 is a flowchart of a method for driving a pixel circuit according to an embodiment of the present invention.
  • FIG. 11 is a signal timing diagram of a method for driving a pixel circuit according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
  • FIG. 13 is a flowchart of an unlocking method according to an embodiment of the present invention.
  • Embodiments of the present invention provide a pixel circuit.
  • the pixel circuit as shown in FIG. 1 , includes: a light-emitting element 11 , a first voltage terminal V1 , a data signal line DATA, a light-emitting control sub-circuit 12 and a photo-sensing sub-circuit 13 .
  • the light-emitting control sub-circuit 12 is connected to the first voltage terminal V1 , the data signal line DATA and the light-emitting element 11 .
  • the photoelectric sensor circuit 13 is connected to the first voltage terminal V1 and the data signal line DATA.
  • the data signal line DATA in the first period of time, is used to transmit a display data signal, and the display data signal is used to control the light-emitting control sub-circuit 12 to provide a driving current to the light-emitting element 11 .
  • the data signal line DATA is used to transmit the sensing data signal acquired by the photoelectric sensing sub-circuit 13 . Wherein, there is no overlapping time period between the first time period and the second time period.
  • the photosensitive electronic circuit 13 for sensing external input since the photosensitive electronic circuit 13 for sensing external input is integrated in the pixel circuit, and when the data signal line DATA does not transmit display data signals, it is used to transmit the sensing data obtained by the photosensitive electronic circuit 13 signal, the photoelectric sensing sub-circuit 13 and the light-emitting control sub-circuit 12 share the first voltage terminal V1. Therefore, there is no need to additionally provide a signal line for transmitting the sensing data signal and the power supply for powering the photoelectric sensing sub-circuit 13, reducing the The difficulty of circuit layout layout.
  • the pixel circuit provided by the embodiment of the present invention is briefly introduced above, and the pixel circuit provided by the embodiment of the present invention is described in detail below.
  • Embodiments of the present invention also provide a pixel circuit.
  • the pixel circuit as shown in FIG. 1 , includes: a light-emitting element 11 , a first voltage terminal V1 , a data signal line DATA, a light-emitting control sub-circuit 12 and a photo-sensing sub-circuit 13 .
  • the light-emitting control sub-circuit 12 is connected to the first voltage terminal V1, the data signal line DATA and the light-emitting element 11.
  • the photoelectric sensor circuit 13 is connected to the first voltage terminal V1 and the data signal line DATA.
  • the first voltage terminal V1 may provide a constant voltage power supply signal, or may provide a constant voltage power supply signal in the second time period, and does not provide a constant voltage power supply in the time period outside the second time period signal, can also provide a power signal with periodic changes.
  • the photoelectric sensing sub-circuit 13 and the light-emitting control sub-circuit 12 share the first voltage terminal V1 and the data signal line DATA, so that the difficulty of circuit layout can be reduced.
  • the data signal line DATA is used to transmit the display data signal
  • the light-emitting control sub-circuit 12 provides the driving current to the light-emitting element 11 according to the display data signal, and then controls the light-emitting brightness of the light-emitting element 11.
  • the data signal line DATA is used to transmit the sensing data signal obtained by the photoelectric sensing sub-circuit 13 for obtaining the sensing data.
  • the data signal line DATA may not affect the transmission of the display data signal when transmitting the sensing data signal obtained by the photoelectric sensing electronic circuit 13, that is, the sensing function is realized. display function will not be affected.
  • the light emitting element 11 may be a diode D, and the diode D may be an organic light emitting diode, a miniLED or a microLED, but is not limited thereto.
  • the photoelectric sensor circuit 13 includes a photosensitive element 131 and a switch element 132 , and the photosensitive element 131 and the switch element 132 are connected in series between the first voltage terminal V1 and the data signal line DATA.
  • the switch element 132 is in an off state, so that the photosensitive element 131 can be prevented from affecting the light-emitting control sub-circuit 12, and further, the display function can be prevented from being affected.
  • the switch element 132 is in a closed state, so that the sensing data signal acquired by the photosensitive element 131 can be transmitted through the data signal line DATA.
  • the lighting control sub-circuit 12 includes a data writing sub-circuit 121 , a driving sub-circuit 122 , a reset sub-circuit 123 , a first lighting control sub-circuit 124 and a second lighting control sub-circuit 125 .
  • the data writing sub-circuit 121 includes a data signal input terminal VDATA, a first power signal input terminal VDD and a data writing control terminal GATE.
  • the data signal input terminal VDATA is connected to the data signal line DATA for receiving the display data signal
  • the first power signal input terminal VDD is used for receiving the first power supply signal
  • the data writing control terminal GATE is used for receiving the data writing control signal
  • the data writing control terminal GATE is used for receiving the data writing control signal.
  • the writing control signal is used to control the data writing sub-circuit 121 to receive the display data signal and store the display data within the first period of time.
  • the data writing sub-circuit 121 is connected to the connection node N, and the connection node N is connected to the driving sub-circuit 122 .
  • the first power signal input terminal VDD is connected to the first voltage terminal V1.
  • the driving sub-circuit 122 is connected to the first power signal input terminal VDD via the first light-emitting control sub-circuit 124 , and is also connected to the positive electrode of the light-emitting element 11 via the second light-emitting control sub-circuit 125 , and is used to supply the light-emitting element to the 11 provides drive current.
  • the negative electrode of the light-emitting element 11 is also connected to the second power supply signal input terminal VSS.
  • the second power supply signal input terminal VSS is used to receive the second power supply signal, and the level of the second power supply signal is lower than that of the first power supply signal. level.
  • the reset sub-circuit 123 includes a reset control terminal RESET and a third power signal input terminal VINT.
  • the reset control terminal RESET is used for receiving the reset signal
  • the third power signal input terminal VINT is used for receiving the third power signal.
  • the level of the three power supply signals is smaller than the level of the first power supply signal, and the reset sub-circuit 123 is connected to the connection node N.
  • the first terminal of the first lighting control sub-circuit 124 is connected to the first power signal input terminal VDD, the second terminal is connected to the driving sub-circuit 122 , and the control terminal is used for receiving the lighting control signal.
  • the first end of the second light-emitting control sub-circuit 125 is connected to the driving sub-circuit 122 , the second end is connected to the positive electrode of the light-emitting element 11 , and the control end is used for receiving the light-emitting control signal.
  • the photosensitive element 131 is the first transistor T1
  • the switch element 132 is the second transistor T2 .
  • the first electrode of the first transistor T1 is connected to the first voltage terminal V1
  • the second electrode of the first transistor T1 is connected to the first electrode of the second transistor T2
  • the gate of the first transistor T1 is connected to the second electrode of the first transistor T1.
  • the electrodes are connected; the second electrode of the second transistor T2 is connected to the data signal line DATA, the gate of the second transistor T2 is connected to the switch control terminal FSW, the switch control terminal FSW is used to receive the switch control signal, and the switch control signal is used to control
  • the second transistor T2 is in an open state during the first time period and is in a closed state during the second time period.
  • the first transistor T1 is in an off state.
  • the first transistor T1 When the first transistor T1 is in an off state, it has a dark current, and can generate a photo-generated current under illumination, and the photo-generated current is the above-mentioned sensing data signal.
  • the first transistor T1 may be a thin film transistor, such as an a-si transistor or an IGZO (Indium Gallium Zinc Oxide) transistor.
  • a-si transistor or an IGZO (Indium Gallium Zinc Oxide) transistor.
  • IGZO Indium Gallium Zinc Oxide
  • the data writing sub-circuit 121 includes a third transistor T3 , a fourth transistor T4 and a second capacitor C2 .
  • the first electrode of the third transistor T3 is the data signal input terminal VDATA, which is connected to the data signal line DATA, and the second electrode of the third transistor T3 is connected to the first terminal of the driving sub-circuit 122.
  • the first terminal of the driving sub-circuit 122 is The first lighting control sub-circuit 124 is connected to the first power signal input terminal VDD, and the gate of the third transistor T3 is connected to the data writing control terminal GATE.
  • the first electrode of the fourth transistor T4 is connected to the connection node N, the second electrode of the fourth transistor T4 is connected to the second terminal of the driving sub-circuit 122 , and the second terminal of the driving sub-circuit 122 is connected through the second lighting control sub-circuit 125
  • the gate of the fourth transistor T4 is connected to the data writing control terminal GATE.
  • the first electrode of the second capacitor C2 is connected to the connection node N, and the second electrode of the second capacitor C2 is connected to the first power signal input terminal VDD.
  • the driving sub-circuit 122 includes a fifth transistor T5, and the first electrode of the fifth transistor T5 is the first end of the driving sub-circuit 122, and is connected to the first light-emitting control sub-circuit 124, The second electrode of the fifth transistor T5 is the second end of the driving sub-circuit 122 and is connected to the second light-emitting control sub-circuit 125 , and the gate of the fifth transistor T5 is connected to the connection node N.
  • the reset sub-circuit 123 includes a sixth transistor T6 and a seventh transistor T7 .
  • the first electrode of the sixth transistor T6 is connected to the connection node N
  • the second electrode of the sixth transistor T6 is connected to the third power signal input terminal VINT
  • the gate of the sixth transistor T6 is connected to the reset control terminal RESET.
  • the first electrode of the seventh transistor T7 is connected to the third power signal input terminal VINT
  • the second electrode of the seventh transistor T7 is connected to the anode of the light emitting element 11
  • the gate of the seventh transistor T7 is connected to the reset control terminal RESET.
  • the first light-emitting control sub-circuit 124 includes an eighth transistor T8, the first electrode of the eighth transistor T8 is connected to the first power signal input terminal VDD, and the second The electrode is connected to the first terminal of the driving sub-circuit 122 , and the gate of the eighth transistor T8 is connected to the control terminal of the first light-emitting control sub-circuit 124 .
  • the second lighting control sub-circuit 125 includes a ninth transistor T9, the first electrode of the ninth transistor T9 is connected to the second end of the driving sub-circuit 122, and the first electrode of the ninth transistor T9 is connected to the second end of the driving sub-circuit 122.
  • the two electrodes are connected to the positive electrode of the light-emitting element 11 , and the gate of the ninth transistor T9 is connected to the control terminal of the second light-emitting control sub-circuit 125 .
  • the first transistor T1 is an N-type transistor
  • the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the eighth transistor T8 and the The ninth transistors T9 are all P-type transistors.
  • the first electrode of the first transistor T1 may be the drain electrode, and the second electrode may be the source electrode, but not limited thereto.
  • the first electrodes of the second transistor T2 to the ninth transistor T9 are source electrodes, and the second electrodes are drain electrodes.
  • the first transistor T1 can also be a P-type transistor
  • the second transistor T2 to the ninth transistor T9 can also be an N-type transistor.
  • the distance between the first transistor T1 and the second transistor T2 may be slightly larger, or a light-shielding structure is provided for the second transistor T2.
  • a light shielding structure is provided for the transistors other than the first transistor T1.
  • the receiving switch control signal received by the switch control terminal FSW is at a high level
  • the second transistor T2 is in an off state
  • the data signal line DATA is used to transmit a display data signal to control the
  • the light-emitting control sub-circuit 12 provides a driving current to the light-emitting element 11 to control the light-emitting luminance of the light-emitting element 11 .
  • the receiving switch control signal received by the switch control terminal FSW is at a low level
  • the second transistor T2 is in a closed state
  • the data signal line DATA is used to transmit the sensing data signal obtained by the first transistor T1.
  • the data signal line DATA may not affect the transmission of the display data signal when transmitting the sensing data signal obtained by the photoelectric sensing electronic circuit 13, that is, the sensing function is realized. display function will not be affected.
  • the data signal line DATA can be used to transmit the display data signal and the sensing data signal respectively in different time periods, and the photoelectric The sensing sub-circuit 13 and the light-emitting control sub-circuit 12 share the first voltage terminal V1. Therefore, there is no need to additionally provide a signal line for transmitting sensing data signals and a power supply for supplying power to the photoelectric sensing sub-circuit 13, thereby reducing the circuit layout. Difficulty of layout.
  • the photoelectric sensor circuit 13 is integrated in the pixel circuit instead of being arranged under the frame or the display panel, so the frame area or the thickness of the display panel can be reduced, which is beneficial to realize a narrow frame or a thin display panel.
  • Embodiments of the present invention also provide a pixel circuit.
  • the difference between the pixel circuit and the pixel circuit shown in FIG. 3 is that the gate of the first transistor T1 is connected to the first electrode of the first transistor T1 .
  • the first electrode of the first transistor T1 can be a source electrode
  • the second electrode of the first transistor T1 can be a drain electrode, so that the first transistor T1 can also be turned off.
  • Embodiments of the present invention also provide a pixel circuit.
  • the difference between the pixel circuit and the pixel circuit shown in FIG. 3 is that the gate of the first transistor T1 is connected to the turn-off signal input terminal VC, and the turn-off signal input terminal VC is used for A turn-off signal is received, and the turn-off signal is used to control the first transistor T1 to be in an off state.
  • Embodiments of the present invention also provide a pixel circuit. As shown in FIG. 6 , in this embodiment, the difference between the pixel circuit and the pixel circuit shown in FIG. 3 is that the first voltage terminal V1 is used to provide the second power supply signal, and the second power supply signal input terminal VSS is connected to the first power supply signal. Voltage terminal V1.
  • the first electrode of the first transistor T1 is connected to the data signal line DATA
  • the second electrode is connected to the first voltage terminal V1 via the switch element 132
  • the gate of the first transistor T1 is connected to the first voltage terminal V1 of the first transistor T1 Two electrode connections.
  • the first electrode of the first transistor T1 can be the drain electrode
  • the second electrode of the first transistor T1 can be the source electrode, so that the first transistor T1 can also be turned off.
  • the gate of the first transistor T1 may be connected to the first electrode of the first transistor T1, the first electrode of the first transistor T1 may be the source, and the second electrode of the first transistor T1 may be the drain In this way, the first transistor T1 can also be turned off.
  • the gate of the first transistor T1 is used to input a turn-off signal, and the turn-off signal is used to control the first transistor T1 to be in an off state.
  • Embodiments of the present invention also provide a pixel circuit. As shown in FIG. 7 , in this embodiment, the difference between the pixel circuit and the pixel circuit shown in FIG. 3 is that the first voltage terminal V1 is used to provide a third power supply signal, and the third power supply signal input terminal VINT is connected to the first power supply signal. Voltage terminal V1.
  • the first electrode of the first transistor T1 is connected to the data signal line DATA
  • the second electrode is connected to the first voltage terminal V1 via the switch element 132
  • the gate of the first transistor T1 is connected to the second electrode.
  • the first electrode of the first transistor T1 can be the drain electrode
  • the second electrode of the first transistor T1 can be the source electrode, so that the first transistor T1 can also be turned off.
  • the gate of the first transistor T1 is connected to the first electrode.
  • the first electrode of the first transistor T1 can be a source electrode, and the second electrode of the first transistor T1 can be a drain electrode, so that the first transistor T1 can also be turned off.
  • the gate of the first transistor T1 is used to input a turn-off signal, and the turn-off signal is used to control the first transistor T1 to be in an off state.
  • the test result is shown in FIG. 8 .
  • Vds between the source and drain of the first transistor T1 is 4V, it can be seen that when the first transistor T1 is exposed to light , the drain current of the first transistor T1 increases.
  • the intensity of the drain current generated in the off state of the first transistor T1 may increase.
  • optical sensing can be performed using the first transistor T1 provided in the pixel.
  • Embodiments of the present invention also provide a pixel circuit.
  • the difference between the pixel circuit and the above-mentioned pixel circuit is that the photosensitive element 131 is a photodiode PD.
  • the cathode of the photodiode PD is connected to the first voltage terminal V1 , and the anode is connected to the data signal line DATA through the switch element 132 .
  • the voltage of the cathode of the photodiode PD is greater than the voltage of the anode, and the photodiode PD is in an off state, or in an off state.
  • the anode of the photodiode PD may be connected to the first voltage terminal V1 , and the cathode may be connected to the data signal line DATA via the switch element 132 .
  • the voltage of the cathode of the photodiode PD is greater than the voltage of the anode, and the photodiode PD is in an off state.
  • the photodiode PD may be a PN diode, a PIN diode, or an OPD (organic photodiode).
  • the photoelectric sensing sub-circuit 13 may further include a first capacitor C1, and the first capacitor C1 is connected in parallel with both ends of the photodiode PD.
  • the first capacitor C1 can be connected in parallel between the photodiode PD and the second transistor T2.
  • Embodiments of the present invention also provide a method for driving a pixel circuit.
  • the driving method of the pixel circuit is used for driving the pixel circuit of any of the above embodiments.
  • the driving method of the pixel circuit as shown in FIG. 10 , includes the following steps 1001 to 1002:
  • step 1001 in the second time period, the photoelectric sensing sub-circuit 13 acquires the sensing data signal, and outputs the sensing data signal through the data signal line DATA.
  • step 1002 the data signal line DATA outputs a display data signal to the light-emitting control sub-circuit 12 during the first time period, so as to control the light-emitting control sub-circuit 12 to provide a driving current to the light-emitting element 11 .
  • the driving method of the pixel circuit is described by taking the pixel circuit shown in FIG. 3 and the signal timing chart shown in FIG. 11 as an example.
  • the pixel circuit can work in the high frequency refresh mode M1 and the low frequency refresh mode M2 .
  • the photoelectric sensor circuit 13 does not perform the sensing function
  • the pixel circuit operates in the low frequency refresh mode M2 the photoelectric sensor circuit 13 performs the sensing function.
  • the refresh frequency of the display device to which the pixel circuit belongs may be 240 Hz, 120 Hz, 90 Hz or 60 Hz, but is not limited thereto.
  • the refresh frequency of the display device to which the pixel circuit belongs may be 60 Hz, 30 Hz or 15 Hz, but is not limited thereto.
  • the reset signal Reset is at a low level
  • the sixth transistor T6 and the seventh transistor T7 are in a closed state
  • the first The three power supply signals are charged into the anode of the diode D and the second capacitor C2 to reset the diode D and the second capacitor C2.
  • the level of the third power supply signal may be a preset level value for resetting the diode D and the second capacitor C2.
  • the switch control signal Fsw is at a high level
  • the second transistor T2 is in an off state
  • the photoelectric sensing sub-circuit 13 does not perform a sensing function.
  • the data writing control signal Gate is at a low level
  • the third transistor T3 and the fourth transistor T4 are in a closed state
  • the data signal line DATA is used to transmit the display data signal Vdata
  • the display data signal Vdata is written into the second capacitor C2.
  • the light-emitting control signal Em is at a low level
  • the eighth transistor T8 and the ninth transistor T9 are in a closed state
  • the fifth transistor T5 provides a driving current to the diode D, and drives the diode D glows.
  • the reset signal Reset is at a low level
  • the sixth transistor T6 and the seventh transistor T7 are in a closed state
  • the third power supply signal The anode of the diode D and the second capacitor C2 are charged to reset the diode D and the second capacitor C2.
  • the switch control signal Fsw is at a low level
  • the second transistor T2 can be controlled to be in a closed state
  • the photoelectric sensor circuit 13 performs the sensing function
  • the sensing data signal obtained by the first transistor T1 is transmitted through the data signal line DATA.
  • the first transistor T1 can generate a dark current.
  • the dark current is the above-mentioned sensing data signal.
  • the first transistor T1 also generates a photo-generated current. Since the dark current still exists, the sensing data signal includes the above-mentioned dark current and the above-mentioned photo-generated current. Among them, the dark current is much smaller than the photogenerated current.
  • the data writing control signal Gate is at a low level
  • the third transistor T3 and the fourth transistor T4 are in a closed state
  • the data signal line DATA is used to transmit the display data signal Vdata
  • the display data signal Vdata is written into the second capacitor C2.
  • the light-emitting control signal Em is at a low level
  • the eighth transistor T8 and the ninth transistor T9 are in a closed state
  • the fifth transistor T5 provides a driving current to the diode D, which drives the diode. D glows.
  • the duration of the second time period T2 is greater than the duration of the first reset time period T4, which can ensure sufficient time to acquire sensing data.
  • the duration of the first time period T1 is greater than the duration of the data writing period T5, and the duration of the second lighting period T3 is greater than the duration of the first lighting period T6.
  • Embodiments of the present invention also provide a display panel.
  • the display panel includes: a pixel controller 1101, a scan driver 1102, a data driver 1103, a lighting controller 1104, a sensing controller 1105, a plurality of lighting control signal lines, a plurality of switch control signal lines, and A number of pixels 1106.
  • the pixel 1106 includes the pixel circuit described above. Each pixel circuit includes a scan signal line and a data signal line DATA.
  • the plurality of pixel circuits include a plurality of scan signal lines and a plurality of data signal lines DATA.
  • the plurality of scan signal lines include a first scan signal line GL1, a second scan signal line GL2, . . . , an Nth scan signal line GLN
  • the plurality of data signal lines DATA include a first data signal line DL1
  • the plurality of switch control signal lines include a first switch control signal line FL1, a second switch control signal line FL2, ..., an Nth switch control signal line FLN, where N is a positive integer and M is a positive integer.
  • the pixel controller 1101 is connected to the scan driver 1102 , the data driver 1103 , and the light-emitting controller 1104 , respectively.
  • the pixel controller 1101 is used to convert the image signal provided by the application processor into a plurality of display data signals, and transmit the plurality of display data signals to the data driver 1103 .
  • the pixel controller 1101 is also used for providing a scan control signal for controlling the scan driver 1102 and a data driving control signal for controlling the data driver 1103 .
  • the scan driver 1102 is respectively connected to each row of pixel circuits via the first scan signal line GL1 , the second scan signal line GL2 , . Output to each row of pixel circuits.
  • the data driver 1103 is connected to each column of pixel circuits via the first data signal line DL1 , the second data signal line DL2 , . output to each column of pixel circuits.
  • the light-emitting controller 1104 is respectively connected to each row of pixel circuits via the first light-emitting control signal line EL1, the second light-emitting control signal line EL2, . . . , and the Nth light-emitting control signal line ELN. Output to each row of pixel circuits respectively.
  • the sensing controller 1105 is respectively connected to each row of pixel circuits via the first switch control signal line FL1 , the second switch control signal line FL2 , . . . , and the Nth switch control signal line FLN, for switching control
  • the signals are respectively output to the pixel circuits of each row.
  • FIG. 12 what is shown in FIG. 12 is an embodiment in which the photosensitive electronic circuit 13 is set in each pixel circuit on the display panel. In other embodiments, the photosensitive electronic circuit 13 is set in some pixel circuits on the display panel. . Moreover, in the embodiment shown in FIG. 12 , the sensing controller 1105 and the scan driver 1102 are two independent devices. In other embodiments, only the scan driver 1102 may be provided, and the sensing controller 1105 may not be provided separately. , the scan driver 1102 can provide scan signals and switch control signals.
  • An embodiment of the present invention also provides a display device, the display device includes a display module and the display panel described in any of the above embodiments.
  • the display device has a fingerprint sensing function.
  • the display device can determine valleys and ridges of the fingerprint according to the above-mentioned sensing data signals.
  • each pixel circuit in the display area of the display device is the above-mentioned pixel circuit, so that the fingerprint detection function can be implemented in the entire display area.
  • each pixel circuit in a partial area of the display area is the above-mentioned pixel circuit, so that a partial area of the display area can implement a fingerprint detection function.
  • the display device after the display device receives the fingerprint sensing instruction, it will control the display device to enter the low-frequency refresh mode M2, and control the second transistor T2 to be in a closed state through the switch control signal Fsw, and the photoelectric sensing sub-circuit 13 performs sensing.
  • the sensing data signal acquired by the first transistor T1 is transmitted to the fingerprint processor through the data signal line DATA, and the fingerprint processor will obtain fingerprint information according to the acquired sensing data signal.
  • the fingerprint information can be used to unlock the fingerprint lock
  • the fingerprint lock can be used to lock the screen or lock the application.
  • the unlocking method may include the following steps 1201-1205:
  • step 1201 the touch position is determined.
  • the display device further includes a touch panel, and the touch panel cooperates with the above-mentioned pixel circuit to realize the function of unlocking the application program by fingerprint.
  • the first display screen 1302 of the display device 1301 displays the first icon APP1 of the first application and the second icon APP2 of the second application.
  • the first application uses the fingerprint lock and the user needs to open the first application, the first application needs to be unlocked first.
  • the user can place the finger 1303 at the display position of the first icon APP1 of the first application.
  • the display device can determine the touch position according to the capacitance value of the touch electrodes on the touch panel.
  • the touch position and the display position of the first icon APP1 may be substantially the same.
  • step 1202 the display screen is refreshed, wherein the color of the touch position in the refreshed display screen is monochrome.
  • the display device refreshes the display screen.
  • the color of the touch position 1305 in the refreshed second display screen 1304 is monochrome.
  • the color of the touch location 1305 is green, red, blue or white, but not limited thereto.
  • the light emitted by the pixels in the touch position 1305 is reflected by the finger and then sensed by the first transistor T1 to obtain a sensing data signal.
  • step 1203 the sensing data signal output by the photoelectric sensing electronic circuit 13 is acquired.
  • the fingerprint processor in the display device acquires the sensing data signal output by the photoelectric sensing sub-circuit 13 through the data signal line DATA.
  • step 1204 fingerprint information is acquired according to the sensing data signal.
  • the fingerprint processor obtains fingerprint information according to the acquired sensing data signal.
  • step 1205 the acquired fingerprint information is compared with the target fingerprint information, and whether to unlock is determined according to the comparison result.
  • the fingerprint processor will compare the acquired fingerprint information with the pre-stored target fingerprint information, and determine whether to unlock according to the comparison result. Wherein, as shown in FIG. 17 , when the acquired fingerprint information matches the target fingerprint information, the first application is unlocked, the first application is opened, and the third display screen 1306 of the first application is displayed. When the acquired fingerprint information does not match the target fingerprint information, the unlocking fails.
  • the display device in this embodiment may be any product or component with display function, such as electronic paper, mobile phone, tablet computer, television, notebook computer, digital photo frame, and navigator.
  • first and second are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
  • plurality refers to two or more, unless expressly limited otherwise.

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Abstract

一种像素电路及其驱动方法、显示面板和显示装置。像素电路包括发光元件（11）、第一电压端（V1）、数据信号线（DATA）、发光控制子电路（12）与光电感应子电路（13）。发光控制子电路（12）连接至第一电压端（V1）、数据信号线（DATA）与发光元件（11）。光电感应子电路（13）连接至第一电压端（V1）与数据信号线（DATA）。

Description

像素电路及其驱动方法、显示面板和显示装置 技术领域
本发明涉及显示技术领域，尤其涉及一种像素电路及其驱动方法、显示面板和显示装置。
背景技术
相关技术中，光传感器通常设置在显示面板的下方或者边框区。这样，会导致难以减小边框区的面积或者显示面板的厚度。为实现光学检测功能的同时又可以实现窄边框或减小显示面板的厚度，可将光传感器与像素电路集成在一起，但是，需要较多的感测信号线用于传输感测数据，增加了电路版图布局的难度。
发明内容
本发明提供一种像素电路及其驱动方法、显示面板和显示装置，以解决相关技术中的不足。
根据本发明实施例的第一方面，提供一种像素电路，包括：
发光元件；
第一电压端；
数据信号线；
发光控制子电路，连接至所述第一电压端、所述数据信号线与所述发光元件；
光电感应子电路，连接至所述第一电压端与所述数据信号线；
在第一时间段内，所述数据信号线用于传输显示数据信号，所述显示数据信号用于控制所述发光控制子电路向所述发光元件提供驱动电流；
在第二时间段内，所述数据信号线用于传输所述光电感应子电路获取的感测数据信号。
在一个实施例中，所述光电感应子电路包括感光元件与开关元件，所述感光元件与所述开关元件串联在所述第一电压端与所述数据信号线之间；
在第一时间段内，所述开关元件处于断开状态；
在第二时间段内，所述开关元件处于闭合状态。
在一个实施例中，所述感光元件为第一晶体管，所述第一晶体管处于断开状态。
在一个实施例中，所述感光元件为二极管，所述二极管处于断开状态。
在一个实施例中，所述光电感应子电路还包括第一电容，所述第一电容并联在所述二极管两端，或者，所述第一电容并联在所述二极管与所述开关元件两端。
在一个实施例中，所述开关元件为第二晶体管。
在一个实施例中，所述发光控制子电路包括数据写入子电路、驱动子电路与复位子电路；
所述数据写入子电路包括用于接收所述显示数据信号的数据信号输入端与用于接收第一电源信号的第一电源信号输入端，所述数据写入子电路连接至连接节点，所述连接节点连接至所述驱动子电路，所述数据信号输入端连接至所述数据信号线；
所述驱动子电路连接至所述第一电源信号输入端与所述发光元件，并用于向所述发光元件提供驱动电流；
所述发光元件还连接至用于接收第二电源信号的第二电源信号输入端；所述第二电源信号的电平小于所述第一电源信号的电平；
所述复位子电路包括用于接收复位信号的复位控制端与用于接收第三电源信号的第三电源信号输入端，所述复位子电路连接至所述连接节点；所述第三电源信号的电平小于所述第一电源信号的电平。
在一个实施例中，所述第一电压端用于提供所述第一电源信号，所述第一电源信号输入端连接至所述第一电压端；
所述第一晶体管的第一电极连接至所述第一电压端，第二电极经所述开关元件连接至所述数据信号线，所述第一晶体管的栅极与所述第一电极连接，或者，
所述第一晶体管的栅极与所述第二电极连接，或者，
所述第一晶体管的栅极用于输入关断信号，所述关断信号用于控制所述第一晶体管处于断开状态。
在一个实施例中，所述第一电压端用于提供所述第二电源信号，所述第二电源信号输入端连接至所述第一电压端；
所述第一晶体管的第一电极连接至所述数据信号线，第二电极经所述开关元件连接至所述第一电压端，所述第一晶体管的栅极与所述第一电极连接，或者，
所述第一晶体管的栅极与所述第二电极连接，或者，
所述第一晶体管的栅极用于输入关断信号，所述关断信号用于控制所述第一晶体管处于断开状态。
在一个实施例中，所述第一电压端用于提供所述第三电源信号，所述第三电源信号输入端连接至所述第一电压端；
所述第一晶体管的第一电极连接至所述数据信号线，第二电极经所述开关元件连接至所述第一电压端，所述第一晶体管的栅极与所述第一电极连接，或者，
所述第一晶体管的栅极与所述第二电极连接，或者，
所述第一晶体管的栅极用于输入关断信号，所述关断信号用于控制所述第一晶体管处于断开状态。
在一个实施例中，所述发光控制子电路还包括第一发光控制子电路与第二发光控制子电路；
所述第一发光控制子电路的第一端连接至所述第一电源信号输入端，第二端连接至所述驱动子电路，控制端用于接收发光控制信号；
所述第二发光控制子电路的第一端连接至所述驱动子电路，第二端连接至所述发光元件，控制端用于接收所述发光控制信号。
根据本发明实施例的第二方面，提供一种显示面板，包括上述的像素电路。
根据本发明实施例的第三方面，提供一种像素电路的驱动方法，用于驱动上述的像素电路，所述方法，包括：
在第一时间段内，所述数据信号线将显示数据信号输出至发光控制子电路，以控制所述发光控制子电路向发光元件提供驱动电流；
在第二时间段内，光电感应子电路获取感测数据信号，并通过数据信号线将所述感测数据信号输出。
在一个实施例中，所述光电感应子电路包括感光元件与开关元件，所述感光元件与所述开关元件串联在所述第一电压端与所述数据信号线之间；所述感光元件处于断开状 态，所述感光元件为第一晶体管或二极管；所述在第二时间段内，光电感应子电路获取感测数据信号，包括：
在第二时间段内，控制所述开关元件处于闭合状态；
当无光照时，所述感光元件产生暗电流，所述暗电流为所述感测数据信号；
当存在光照时，所述感光元件还产生光生电流，所述感测数据信号包括所述暗电流与所述光生电流。
根据上述实施例可知，由于用于感测外部输入的光电感应子电路集成在像素电路中，且在数据信号线不传输显示数据信号时用于传输光电感应子电路获取的感测数据信号，光电感应子电路与发光控制子电路共同使用第一电压端，因此，可不用额外设置用于传输感测数据信号的信号线以及给光电感应子电路供电的电源，减小了电路版图布局的难度。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本发明。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本发明的实施例，并与说明书一起用于解释本发明的原理。
图1是根据本发明实施例示出的一种像素电路的结构示意图；
图2是根据本发明实施例示出的另一种像素电路的结构示意图；
图3是根据本发明实施例示出的另一种像素电路的结构示意图；
图4是根据本发明实施例示出的另一种像素电路的结构示意图；
图5是根据本发明实施例示出的另一种像素电路的结构示意图；
图6是根据本发明实施例示出的另一种像素电路的结构示意图；
图7是根据本发明实施例示出的另一种像素电路的结构示意图；
图8是根据本发明实施例示出的第一晶体管是N型晶体管的测试结果实示意图；
图9是根据本发明实施例示出的另一种像素电路的结构示意图；
图10是根据本发明实施例示出的一种像素电路的驱动方法的流程图；
图11是根据本发明实施例示出的一种像素电路的驱动方法的信号时序图；
图12是根据本发明实施例示出的一种显示面板的结构示意图；
图13是根据本发明实施例示出的一种解锁方法的流程图；
图14～17是根据本发明实施例示出的一种解锁方法的应用场景示意图。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本发明相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本发明的一些方面相一致的装置和方法的例子。
本发明实施例提供一种像素电路。该像素电路，如图1所示，包括：发光元件11、第一电压端V1、数据信号线DATA、发光控制子电路12与光电感应子电路13。
如图1所示，发光控制子电路12连接至第一电压端V1、数据信号线DATA与发光元件11。光电感应子电路13连接至第一电压端V1与数据信号线DATA。
在本实施例中，在第一时间段内，数据信号线DATA用于传输显示数据信号，显示数据信号用于控制发光控制子电路12向发光元件11提供驱动电流。在第二时间段内，数据信号线DATA用于传输光电感应子电路13获取的感测数据信号。其中，第一时间段与第二时间段之间不存在重叠时间段。
在本实施例中，由于用于感测外部输入的光电感应子电路13集成在像素电路中，且在数据信号线DATA不传输显示数据信号时用于传输光电感应子电路13获取的感测数据信号，光电感应子电路13与发光控制子电路12共同使用第一电压端V1，因此，可不用额外设置用于传输感测数据信号的信号线以及给光电感应子电路13供电的电源，减小了电路版图布局的难度。
以上对本发明实施例提供的像素电路进行了简要的介绍，下面对本发明实施例提供的像素电路进行详细的介绍。
本发明实施例还提供一种像素电路。该像素电路，如图1所示，包括：发光元件11、第一电压端V1、数据信号线DATA、发光控制子电路12与光电感应子电路13。
如图1所示，发光控制子电路12连接至第一电压端V1、数据信号线DATA与发光 元件11。光电感应子电路13连接至第一电压端V1与数据信号线DATA。
在本实施例中，第一电压端V1可以提供恒压的电源信号，也可以在第二时间段内提供恒压的电源信号，在第二时间段之外的时间段不提供恒压的电源信号，也可以提供具有周期性的变化的电源信号。
在本实施例中，光电感应子电路13与发光控制子电路12共用第一电压端V1与数据信号线DATA，这样，可以减小电路版图布局的难度。而且，在第一时间段内，数据信号线DATA用于传输显示数据信号，发光控制子电路12根据显示数据信号向发光元件11提供驱动电流，进而控制发光元件11的发光亮度，在第二时间段内，数据信号线DATA用于传输光电感应子电路13获取的感测数据信号，以用于获取感测数据。由于第一时间段与第二时间段之间不存在重叠时间段，因此，数据信号线DATA传输光电感应子电路13获取的感测数据信号时可以不影响传输显示数据信号，即实现感测功能时不会影响显示功能。
在本实施例中，如图2所示，发光元件11可以为二极管D，二极管D可以是有机发光二极管、miniLED或microLED，但不限于此。
在本实施例中，如图2所示，光电感应子电路13包括感光元件131与开关元件132，感光元件131与开关元件132串联在第一电压端V1与数据信号线DATA之间。在第一时间段内，开关元件132处于断开状态，这样，可以避免感光元件131影响发光控制子电路12，进而，可以避免影响显示功能。在第二时间段内，开关元件132处于闭合状态，这样，可以使感光元件131获取的感测数据信号通过数据信号线DATA传输。
在本实施例中，如图2所示，发光控制子电路12包括数据写入子电路121、驱动子电路122、复位子电路123、第一发光控制子电路124与第二发光控制子电路125。
如图2所示，数据写入子电路121包括数据信号输入端VDATA、第一电源信号输入端VDD与数据写入控制端GATE。数据信号输入端VDATA连接至数据信号线DATA，用于接收显示数据信号，第一电源信号输入端VDD用于接收第一电源信号，数据写入控制端GATE用于接收数据写入控制信号，数据写入控制信号用于控制数据写入子电路121在第一时间段内接收显示数据信号并存储显示数据。数据写入子电路121连接至连接节点N，连接节点N连接至驱动子电路122。第一电源信号输入端VDD连接至第一电压端V1。
如图2所示，驱动子电路122经第一发光控制子电路124连接至第一电源信号输入 端VDD，还经第二发光控制子电路125连接至发光元件11的正极，并用于向发光元件11提供驱动电流。
如图2所示，发光元件11的负极还连接至第二电源信号输入端VSS，第二电源信号输入端VSS用于接收第二电源信号，第二电源信号的电平小于第一电源信号的电平。
如图2所示，复位子电路123包括复位控制端RESET与第三电源信号输入端VINT，复位控制端RESET用于接收复位信号，第三电源信号输入端VINT用于接收第三电源信号，第三电源信号的电平小于第一电源信号的电平，复位子电路123连接至连接节点N。
如图2所示，第一发光控制子电路124的第一端连接至第一电源信号输入端VDD，第二端连接至驱动子电路122，控制端用于接收发光控制信号。
如图2所示，第二发光控制子电路125的第一端连接至驱动子电路122，第二端连接至发光元件11的正极，控制端用于接收发光控制信号。
在本实施例中，如图3所示，在光电感应子电路13中，感光元件131为第一晶体管T1，开关元件132为第二晶体管T2。第一晶体管T1的第一电极连接至第一电压端V1，第一晶体管T1的第二电极与第二晶体管T2的第一电极连接，第一晶体管T1的栅极与第一晶体管T1的第二电极连接；第二晶体管T2的第二电极连接至数据信号线DATA，第二晶体管T2的栅极连接至开关控制端FSW，开关控制端FSW用于接收开关控制信号，该开关控制信号用于控制第二晶体管T2在第一时间段内处于断开状态，在第二时间段内处于闭合状态。
在本实施例中，第一晶体管T1处于断开状态。第一晶体管T1处于断开状态时，具有暗电流，在光照下能够产生光生电流，光生电流即为上述的感测数据信号。
在本实施例中，第一晶体管T1可以是薄膜晶体管，例如可以是a-si晶体管或IGZO(铟镓锌氧化物)晶体管。
在本实施例中，如图3所示，数据写入子电路121包括第三晶体管T3、第四晶体管T4与第二电容C2。第三晶体管T3的第一电极为数据信号输入端VDATA，连接至数据信号线DATA，第三晶体管T3的第二电极连接至驱动子电路122的第一端，驱动子电路122的第一端经第一发光控制子电路124连接至第一电源信号输入端VDD，第三晶体管T3的栅极连接至数据写入控制端GATE。第四晶体管T4的第一电极连接至连接节点N，第四晶体管T4的第二电极连接至驱动子电路122的第二端，驱动子电路122的 第二端经第二发光控制子电路125连接至发光元件11的正极，第四晶体管T4的栅极连接至数据写入控制端GATE。第二电容C2的第一电极连接至连接节点N，第二电容C2的第二电极连接至第一电源信号输入端VDD。
在本实施例中，如图3所示，驱动子电路122包括第五晶体管T5，第五晶体管T5的第一电极为驱动子电路122的第一端，连接至第一发光控制子电路124，第五晶体管T5的第二电极为驱动子电路122的第二端，连接至第二发光控制子电路125，第五晶体管T5的栅极连接至连接节点N。
在本实施例中，如图3所示，复位子电路123包括第六晶体管T6与第七晶体管T7。第六晶体管T6的第一电极连接至连接节点N，第六晶体管T6的第二电极连接至第三电源信号输入端VINT，第六晶体管T6的栅极连接至复位控制端RESET。第七晶体管T7的第一电极连接至第三电源信号输入端VINT，第七晶体管T7的第二电极连接至发光元件11的正极，第七晶体管T7的栅极连接至复位控制端RESET。
在本实施例中，如图3所示，第一发光控制子电路124包括第八晶体管T8，第八晶体管T8的第一电极连接至第一电源信号输入端VDD，第八晶体管T8的第二电极连接至驱动子电路122的第一端，第八晶体管T8的栅极连接至第一发光控制子电路124的控制端。
在本实施例中，如图3所示，第二发光控制子电路125包括第九晶体管T9，第九晶体管T9的第一电极连接至驱动子电路122的第二端，第九晶体管T9的第二电极连接至发光元件11的正极，第九晶体管T9的栅极连接至第二发光控制子电路125的控制端。
在本实施例中，第一晶体管T1为N型晶体管，第二晶体管T2、第三晶体管T3、第四晶体管T4、第五晶体管T5、第六晶体管T6、第七晶体管T7、第八晶体管T8与第九晶体管T9均为P型晶体管。第一晶体管T1的第一电极可为漏极，第二电极可为源极，但不限于此。第二晶体管T2～第九晶体管T9的第一电极为源极，第二电极为漏极。当第一晶体管T1的第一电极为漏极，第二电极为源极时，第一晶体管T1的栅极与源极之间的电压Vgs＝0，第一晶体管T1的阈值电压Vth可为0.7伏特，即Vgs<Vth，第一晶体管T1处于断开状态。
当然，在其他实施例中，第一晶体管T1也可为P型晶体管，第二晶体管T2～第九晶体管T9也可为N型晶体管。
在本实施例中，为避免第二晶体管T2受光照的影响，第一晶体管T1与第二晶体管 T2之间的间距可以稍微大一些，或者，为第二晶体管T2设置遮光结构。在其他实施例中，为避免除第一晶体管T1之外的晶体管受光照的影响，为除第一晶体管T1之外的晶体管设置遮光结构。
在本实施例中，在第一时间段内，开关控制端FSW接收的接收开关控制信号为高电平，第二晶体管T2处于断开状态，数据信号线DATA用于传输显示数据信号，以控制发光控制子电路12向发光元件11提供驱动电流，进而控制发光元件11的发光亮度。在第二时间段内，开关控制端FSW接收的接收开关控制信号为低电平，第二晶体管T2处于闭合状态，数据信号线DATA用于传输第一晶体管T1获取的感测数据信号。由于第一时间段与第二时间段之间不存在重叠时间段，因此，数据信号线DATA传输光电感应子电路13获取的感测数据信号时可以不影响传输显示数据信号，即实现感测功能时不会影响显示功能。
在本实施例中，由于用于感测外部输入的光电感应子电路13集成在像素电路中，数据信号线DATA可以在不同的时间段分别用于传输显示数据信号与感测数据信号，且光电感应子电路13与发光控制子电路12共同使用第一电压端V1，因此，可不用额外设置用于传输感测数据信号的信号线以及给光电感应子电路13供电的电源，减小了电路版图布局的难度。
而且，光电感应子电路13集成在像素电路中，而不是设置在边框或者显示面板的下方，因此，可以减小边框面积或者显示面板的厚度，有利于实现窄边框或厚度薄的显示面板。
本发明的实施例还提出了一种像素电路。如图4所示，在本实施例中，像素电路与图3所示的像素电路不同的是，第一晶体管T1的栅极与第一晶体管T1的第一电极连接。在本实施例中，第一晶体管T1的第一电极可为源极，第一晶体管T1的第二电极可为漏极，这样，也可以使第一晶体管T1处于断开状态。
本发明的实施例还提出了一种像素电路。如图5所示，在本实施例中，像素电路与图3所示的像素电路不同的是，第一晶体管T1的栅极连接至关断信号输入端VC，关断信号输入端VC用于接收关断信号，关断信号用于控制第一晶体管T1处于断开状态。
本发明的实施例还提出了一种像素电路。如图6所示，在本实施例中，像素电路与图3所示的像素电路不同的是，第一电压端V1用于提供第二电源信号，第二电源信号输入端VSS连接至第一电压端V1。
在本实施例中，第一晶体管T1的第一电极连接至数据信号线DATA，第二电极经开关元件132连接至第一电压端V1，第一晶体管T1的栅极与第一晶体管T1的第二电极连接。在本实施例中，第一晶体管T1的第一电极可为漏极，第一晶体管T1的第二电极可为源极，这样，也可以使第一晶体管T1处于断开状态。
在另一个实施例中，第一晶体管T1的栅极可与第一晶体管T1的第一电极连接，第一晶体管T1的第一电极可为源极，第一晶体管T1的第二电极可为漏极，这样，也可以使第一晶体管T1处于断开状态。
在另一个实施例中，第一晶体管T1的栅极用于输入关断信号，关断信号用于控制第一晶体管T1处于断开状态。
本发明的实施例还提出了一种像素电路。如图7所示，在本实施例中，像素电路与图3所示的像素电路不同的是，第一电压端V1用于提供第三电源信号，第三电源信号输入端VINT连接至第一电压端V1。
在本实施例中，第一晶体管T1的第一电极连接至数据信号线DATA，第二电极经开关元件132连接至第一电压端V1，第一晶体管T1的栅极与第二电极连接。在本实施例中，第一晶体管T1的第一电极可为漏极，第一晶体管T1的第二电极可为源极，这样，也可以使第一晶体管T1处于断开状态。
在另一个实施例中，第一晶体管T1的栅极与第一电极连接。第一晶体管T1的第一电极可为源极，第一晶体管T1的第二电极可为漏极，这样，也可以使第一晶体管T1处于断开状态。
在另一个实施例中，第一晶体管T1的栅极用于输入关断信号，关断信号用于控制第一晶体管T1处于断开状态。
需要说明的是，当第一晶体管T1为N型晶体管时，测试结果如图8所示。在低于0V的电压施加到第一晶体管T1的栅极并且第一晶体管T1的源极和漏极之间的电压差Vds为4V时，可以看到，当第一晶体管T1暴露在光下时，第一晶体管T1的漏极电流增加。
当第一晶体管T1设置成底栅结构并且被光照射时，在第一晶体管T1的截止状态中产生的漏极电流的强度会增加。通过增加由第一晶体管T1的光学响应引起的截止电流，可以使用像素中设置的第一晶体管T1进行光学感测。
本发明的实施例还提出了一种像素电路。如图9所示，在本实施例中，像素电 路与上述像素电路不同的是，感光元件131为光电二极管PD。光电二极管PD的负极连接至第一电压端V1，正极经开关元件132连接至数据信号线DATA。在第二时间段内，光电二极管PD负极的电压大于正极的电压，光电二极管PD处于断开状态，或者说处于截止状态。
当然，在其他实施例中，光电二极管PD的正极可连接至第一电压端V1，负极可经开关元件132连接至数据信号线DATA。光电二极管PD负极的电压大于正极的电压，光电二极管PD处于断开状态。
在本实施例中，光电二极管PD可以是PN二极管、PIN二极管或OPD(有机光电二极管)。
在另一个实施例中，如图9所示，光电感应子电路13还可包括第一电容C1，第一电容C1并联在光电二极管PD两端。在另一个实施例中，第一电容C1可并联在光电二极管PD与第二晶体管T2两端。
本发明的实施例还提出了一种像素电路的驱动方法。该像素电路的驱动方法用于驱动上述任一实施例的像素电路。该像素电路的驱动方法，如图10所示，包括以下步骤1001～1002：
在步骤1001中，在第二时间段内，光电感应子电路13获取感测数据信号，并通过数据信号线DATA将感测数据信号输出。
在步骤1002中，在第一时间段内，数据信号线DATA将显示数据信号输出至发光控制子电路12，以控制发光控制子电路12向发光元件11提供驱动电流。
在本实施例中，以图3所示的像素电路与图11所示的信号时序图为例，说明像素电路的驱动方法。
如图11所示，像素电路可工作于高频刷新模式M1下与低频刷新模式M2下。像素电路工作于高频刷新模式M1下时，光电感应子电路13不执行感测功能，像素电路工作于低频刷新模式M2下时，光电感应子电路13执行感测功能。其中，像素电路工作于高频刷新模式M1下时，像素电路所属的显示装置的刷新频率可以是240Hz、120Hz、90Hz或60Hz，但不限于此。电路工作于低频刷新模式M2下时，像素电路所属的显示装置的刷新频率可以是60Hz、30Hz或15Hz，但不限于此。
如图11所示，像素电路工作于高频刷新模式M1下时，在第一重置时间段T4内，复位信号Reset为低电平，第六晶体管T6与第七晶体管T7处于闭合状态，第三电 源信号充入二极管D的正极以及第二电容C2，使二极管D与第二电容C2复位。第三电源信号的电平可以是预设电平值，用于使二极管D与第二电容C2复位。在第一重置时间段T4内，开关控制信号Fsw为高电平，第二晶体管T2处于断开状态，光电感应子电路13不执行感测功能。
如图11所示，在数据写入时间段T5内，数据写入控制信号Gate为低电平，第三晶体管T3与第四晶体管T4处于闭合状态，数据信号线DATA用于传输显示数据信号Vdata，显示数据信号Vdata写入第二电容C2。
如图11所示，在第一发光时间段T6内，发光控制信号Em为低电平，第八晶体管T8与第九晶体管T9处于闭合状态，第五晶体管T5向二极管D提供驱动电流，驱动二极管D发光。
如图11所示，像素电路工作于低频刷新模式M2下时，在第二时间段T2内，复位信号Reset为低电平，第六晶体管T6与第七晶体管T7处于闭合状态，第三电源信号充入二极管D的正极以及第二电容C2，使二极管D与第二电容C2复位。而且，开关控制信号Fsw为低电平，可控制第二晶体管T2处于闭合状态，光电感应子电路13执行感测功能，第一晶体管T1获取的感测数据信号经数据信号线DATA传输。其中，当无光照时，第一晶体管T1可产生暗电流，若光电感应子电路13执行感测功能，暗电流为上述的感测数据信号。当存在光照时，第一晶体管T1还产生光生电流，由于暗电流仍存在，因此，感测数据信号包括上述的暗电流与上述的光生电流。其中，暗电流远远小于光生电流。
如图11所示，在第一时间段T1内，数据写入控制信号Gate为低电平，第三晶体管T3与第四晶体管T4处于闭合状态，数据信号线DATA用于传输显示数据信号Vdata，显示数据信号Vdata写入第二电容C2。
如图11所示，在第二发光时间段T3内，发光控制信号Em为低电平，第八晶体管T8与第九晶体管T9处于闭合状态，第五晶体管T5向二极管D提供驱动电流，驱动二极管D发光。
在本实施例中，第二时间段T2的时长大于第一重置时间段T4的时长，这样可以保证有充足的时间获取感测数据。第一时间段T1的时长大于数据写入时间段T5的时长，第二发光时间段T3的时长大于第一发光时间段T6的时长。
本发明的实施例还提出了一种显示面板。如图12所示，该显示面板，包括：像 素控制器1101、扫描驱动器1102、数据驱动器1103、发光控制器1104、感测控制器1105、多条发光控制信号线、多条开关控制信号线以及多个像素1106。像素1106包括上述的像素电路。每个像素电路包括一条扫描信号线与一条数据信号线DATA。多个像素电路包括多条扫描信号线与多条数据信号线DATA。
如图12所示，多条扫描信号线包括第一扫描信号线GL1、第二扫描信号线GL2、……、第N扫描信号线GLN，多条数据信号线DATA包括第一数据信号线DL1、第二数据信号线DL2、……、第M数据信号线DLM，多条发光控制信号线包括第一发光控制信号线EL1、第二发光控制信号线EL2、……、第N发光控制信号线ELN，多条开关控制信号线包括第一开关控制信号线FL1、第二开关控制信号线FL2、……、第N开关控制信号线FLN，其中，N为正整数，M为正整数。
如图12所示，像素控制器1101分别与扫描驱动器1102、数据驱动器1103、发光控制器1104连接。像素控制器1101用于将应用处理器提供的图像信号转换为多个显示数据信号，并将多个显示数据信号传输给数据驱动器1103。像素控制器1101还用于提供控制扫描驱动器1102的扫描控制信号和控制数据驱动器1103的数据驱动控制信号。
如图12所示，扫描驱动器1102经由第一扫描信号线GL1、第二扫描信号线GL2、……、第N扫描信号线GLN分别与各行像素电路连接，用于按照设定顺序将扫描信号分别输出至各行像素电路。
如图12所示，数据驱动器1103经由第一数据信号线DL1、第二数据信号线DL2、……、第M数据信号线DLM分别与各列像素电路连接，用于将多个显示数据信号分别输出至各列像素电路。
如图12所示，发光控制器1104经由第一发光控制信号线EL1、第二发光控制信号线EL2、……、第N发光控制信号线ELN分别与各行像素电路连接，用于将发光控制信号分别输出至各行像素电路。
如图12所示，感测控制器1105经由第一开关控制信号线FL1、第二开关控制信号线FL2、……、第N开关控制信号线FLN分别与各行像素电路连接，用于将开关控制信号分别输出至各行像素电路。
需要说明的是，图12中示出的是显示面板上每个像素电路中设置光电感应子电路13的实施例，在其他实施例中，显示面板上的部分像素电路中设置光电感应子电路13。而且，图12中示出的实施例中，感测控制器1105与扫描驱动器1102是两个独立 的器件，在其他实施例中，可以仅设置扫描驱动器1102，而不单独设置感测控制器1105，扫描驱动器1102可以提供扫描信号与开关控制信号。
本发明的实施例还提出了一种显示装置，该显示装置包括显示模组与上述任一实施例所述的显示面板。
在本实施例中，显示装置具备指纹感测功能。显示装置能够根据上述的感测数据信号确定指纹的谷和脊。
在本实施例中，显示装置的显示区域中的每个像素电路均为上述的像素电路，这样，全部显示区域可实现指纹检测功能。在其他实施例中，显示区域中的部分区域中的每个像素电路为上述的像素电路，这样，显示区域中的部分区域可实现指纹检测功能。
在本实施例中，当显示装置接收到指纹感测指令后，会控制显示装置进入低频刷新模式M2，并通过开关控制信号Fsw控制第二晶体管T2处于闭合状态，光电感应子电路13执行感测功能，第一晶体管T1获取的感测数据信号经数据信号线DATA传输至指纹处理器，指纹处理器会根据获取的感测数据信号得到指纹信息。其中，指纹信息可以用于解锁指纹锁，指纹锁可以用于锁屏幕或锁应用程序。
下面以利用指纹信息解锁应用程序为例介绍解锁方法。如图13所示，解锁方法可以包括以下步骤1201～1205：
在步骤1201中，确定触摸位置。
在本实施例中，显示装置还包括触控面板，触控面板与上述的像素电路相配合可以实现指纹解锁应用程序的功能。
如图14所示，显示装置1301的第一显示画面1302上显示第一应用程序的第一图标APP1与第二应用程序的第二图标APP2。当第一应用程序使用了指纹锁且用户需要打开第一应用程序时，需要先解锁第一应用程序。如图15所示，在解锁第一应用程序时，用户可以将手指1303放置在第一应用程序的第一图标APP1的显示位置处。显示装置可以根据触控面板上的触控电极的电容值确定触摸位置。触摸位置与第一图标APP1的显示位置可基本相同。
在步骤1202中，刷新显示画面，其中，刷新后显示画面中触摸位置的颜色为单色。
在本实施例中，显示装置在确定触摸位置后，刷新显示画面，如图16所示，刷 新后的第二显示画面1304中触摸位置1305的颜色为单色。例如，触摸位置1305的颜色为绿色、红色、蓝色或白色，但不限于此。触摸位置1305中像素发射的光被手指反射后被第一晶体管T1感测，得到感测数据信号。
在步骤1203中，获取光电感应子电路13输出的感测数据信号。
在本实施例中，显示装置中的指纹处理器会通过数据信号线DATA获取光电感应子电路13输出的感测数据信号。
在步骤1204中，根据感测数据信号获取指纹信息。
在本实施例中，指纹处理器会根据获取的感测数据信号得到指纹信息。
在步骤1205中，比对获取的指纹信息与目标指纹信息，并根据比对结果确定是否解锁。
在本实施例中，指纹处理器会比对获取的指纹信息与预先存储的目标指纹信息，并根据比对结果确定是否解锁。其中，如图17所示，当获取的指纹信息与目标指纹信息相匹配时，解锁第一应用程序，并打开第一应用程序、显示第一应用程序的第三显示画面1306。当获取的指纹信息与目标指纹信息不匹配时，解锁失败。
需要说明的是，本实施例中的显示装置可以为：电子纸、手机、平板电脑、电视机、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。
需要指出的是，在附图中，为了图示的清晰可能夸大了层和区域的尺寸。而且可以理解，当元件或层被称为在另一元件或层“上”时，它可以直接在其他元件上，或者可以存在中间的层。另外，可以理解，当元件或层被称为在另一元件或层“下”时，它可以直接在其他元件下，或者可以存在一个以上的中间的层或元件。另外，还可以理解，当层或元件被称为在两层或两个元件“之间”时，它可以为两层或两个元件之间唯一的层，或还可以存在一个以上的中间层或元件。通篇相似的参考标记指示相似的元件。
在本发明中，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性。术语“多个”指两个或两个以上，除非另有明确的限定。
本领域技术人员在考虑说明书及实践这里公开的公开后，将容易想到本发明的其它实施方案。本发明旨在涵盖本发明的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本发明的一般性原理并包括本发明未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本发明的真正范围和精 神由下面的权利要求指出。
应当理解的是，本发明并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其范围进行各种修改和改变。本发明的范围仅由所附的权利要求来限制。

Claims (14)

  1. 一种像素电路，其特征在于，包括：
    发光元件；
    第一电压端；
    数据信号线；
    发光控制子电路，连接至所述第一电压端、所述数据信号线与所述发光元件；
    光电感应子电路，连接至所述第一电压端与所述数据信号线；
    在第一时间段内，所述数据信号线用于传输显示数据信号，所述显示数据信号用于控制所述发光控制子电路向所述发光元件提供驱动电流；
    在第二时间段内，所述数据信号线用于传输所述光电感应子电路获取的感测数据信号。
  2. 根据权利要求1所述的像素电路，其特征在于，所述光电感应子电路包括感光元件与开关元件，所述感光元件与所述开关元件串联在所述第一电压端与所述数据信号线之间；
    在所述第一时间段内，所述开关元件处于断开状态；
    在所述第二时间段内，所述开关元件处于闭合状态。
  3. 根据权利要求2所述的像素电路，其特征在于，所述感光元件为第一晶体管，所述第一晶体管处于断开状态。
  4. 根据权利要求2所述的像素电路，其特征在于，所述感光元件为二极管，所述二极管处于断开状态。
  5. 根据权利要求4所述的像素电路，其特征在于，所述光电感应子电路还包括第一电容，所述第一电容并联在所述二极管两端，或者，所述第一电容并联在所述二极管与所述开关元件两端。
  6. 根据权利要求2所述的像素电路，其特征在于，所述开关元件为第二晶体管。
  7. 根据权利要求3所述的像素电路，其特征在于，所述发光控制子电路包括数据写入子电路、驱动子电路与复位子电路；
    所述数据写入子电路包括用于接收所述显示数据信号的数据信号输入端与用于接收第一电源信号的第一电源信号输入端，所述数据写入子电路连接至连接节点，所述连接节点连接至所述驱动子电路，所述数据信号输入端连接至所述数据信号线；
    所述驱动子电路连接至所述第一电源信号输入端与所述发光元件，并用于向所述发光元件提供驱动电流；
    所述发光元件还连接至用于接收第二电源信号的第二电源信号输入端；所述第二电源信号的电平小于所述第一电源信号的电平；
    所述复位子电路包括用于接收复位信号的复位控制端与用于接收第三电源信号的第三电源信号输入端，所述复位子电路连接至所述连接节点；所述第三电源信号的电平小于所述第一电源信号的电平。
  8. 根据权利要求7所述的像素电路，其特征在于，所述第一电压端用于提供所述第一电源信号，所述第一电源信号输入端连接至所述第一电压端；
    所述第一晶体管的第一电极连接至所述第一电压端，第二电极经所述开关元件连接至所述数据信号线，所述第一晶体管的栅极与所述第一电极连接，或者，
    所述第一晶体管的栅极与所述第二电极连接，或者，
    所述第一晶体管的栅极用于输入关断信号，所述关断信号用于控制所述第一晶体管处于断开状态。
  9. 根据权利要求7所述的像素电路，其特征在于，所述第一电压端用于提供所述第二电源信号，所述第二电源信号输入端连接至所述第一电压端；
    所述第一晶体管的第一电极连接至所述数据信号线，第二电极经所述开关元件连接至所述第一电压端，所述第一晶体管的栅极与所述第一电极连接，或者，
    所述第一晶体管的栅极与所述第二电极连接，或者，
    所述第一晶体管的栅极用于输入关断信号，所述关断信号用于控制所述第一晶体管处于断开状态。
  10. 根据权利要求7所述的像素电路，其特征在于，所述第一电压端用于提供所述第三电源信号，所述第三电源信号输入端连接至所述第一电压端；
    所述第一晶体管的第一电极连接至所述数据信号线，第二电极经所述开关元件连接至所述第一电压端，所述第一晶体管的栅极与所述第一电极连接，或者，
    所述第一晶体管的栅极与所述第二电极连接，或者，
    所述第一晶体管的栅极用于输入关断信号，所述关断信号用于控制所述第一晶体管处于断开状态。
  11. 根据权利要求7所述的像素电路，其特征在于，所述发光控制子电路还包括第一发光控制子电路与第二发光控制子电路；
    所述第一发光控制子电路的第一端连接至所述第一电源信号输入端，第二端连接至所述驱动子电路，控制端用于接收发光控制信号；
    所述第二发光控制子电路的第一端连接至所述驱动子电路，第二端连接至所述发光 元件，控制端用于接收所述发光控制信号。
  12. 一种显示面板，其特征在于，包括：权利要求1至11任一项所述的像素电路。
  13. 一种像素电路的驱动方法，其特征在于，用于驱动权利要求1至11任一项所述的像素电路，所述方法，包括：
    在第一时间段内，所述数据信号线将显示数据信号输出至发光控制子电路，以控制所述发光控制子电路向发光元件提供驱动电流；
    在第二时间段内，光电感应子电路获取感测数据信号，并通过数据信号线将所述感测数据信号输出。
  14. 根据权利要求13所述的像素电路的驱动方法，其特征在于，所述光电感应子电路包括感光元件与开关元件，所述感光元件与所述开关元件串联在所述第一电压端与所述数据信号线之间；所述感光元件处于断开状态，所述感光元件为第一晶体管或二极管；所述在第二时间段内，光电感应子电路获取感测数据信号，包括：
    在第二时间段内，控制所述开关元件处于闭合状态；
    当无光照时，所述感光元件产生暗电流，所述暗电流为所述感测数据信号；
    当存在光照时，所述感光元件还产生光生电流，所述感测数据信号包括所述暗电流与所述光生电流。
PCT/CN2021/126897 2021-02-26 2021-10-28 像素电路及其驱动方法、显示面板和显示装置 WO2022179153A1 (zh)

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