WO2016141681A1 - 像素电路及其驱动方法、显示装置 - Google Patents

像素电路及其驱动方法、显示装置 Download PDF

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Publication number
WO2016141681A1
WO2016141681A1 PCT/CN2015/087632 CN2015087632W WO2016141681A1 WO 2016141681 A1 WO2016141681 A1 WO 2016141681A1 CN 2015087632 W CN2015087632 W CN 2015087632W WO 2016141681 A1 WO2016141681 A1 WO 2016141681A1
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Prior art keywords
voltage
module
node
control signal
signal input
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Ceased
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PCT/CN2015/087632
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English (en)
French (fr)
Inventor
王博
玄明花
张毅
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BOE Technology Group Co Ltd
Ordos Yuansheng Optoelectronics Co Ltd
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BOE Technology Group Co Ltd
Ordos Yuansheng Optoelectronics Co Ltd
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Priority to US14/909,943 priority Critical patent/US9875691B2/en
Publication of WO2016141681A1 publication Critical patent/WO2016141681A1/zh
Anticipated expiration legal-status Critical
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    • 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]
    • G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—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] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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    • 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]
    • G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
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    • 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]
    • G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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    • G09G2300/0421—Structural details of the set of electrodes
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    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G—PHYSICS
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    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, and a display device.
  • OLED Organic Light Emitting Diode
  • LCD liquid crystal display
  • the threshold voltage of the driving TFT of each pixel has unevenness, which leads to the flow of each The current of the pixel OLED changes to make the display brightness uneven, thereby affecting the display effect of the entire image.
  • the present invention provides a pixel circuit including: a driving module, an energy storage module, an electroluminescent module, a data voltage writing module, a threshold compensation module, and a reset module, and has an operating voltage input terminal and a data voltage input. And a plurality of control signal input ends; wherein the first end of the energy storage module is connected to the first node, and the second end is connected to the second node;
  • the control end of the driving module is connected to the first node, and the output end is connected to the third node, and is adapted to be based on the voltage of the first node when the first end of the driving module is connected to the working voltage input end.
  • the data voltage writing module is connected to the first control signal input end, the data voltage input end and the second node, and is adapted to send the data in response to a control signal accessed by the first control signal input end Writing a data voltage input to the voltage input terminal to the second node;
  • the threshold compensation module is connected to the first node and the second control signal input end, and is adapted to compensate the voltage of the first node to the driving in response to a control signal accessed by the second control signal input end The sum of the threshold voltage of the module and the voltage to which the operating voltage input is connected;
  • the output end of the reset module is connected to the first node, and the input end and the control end are connected to the third control signal input end, and are adapted to be turned on when the third control signal input end is connected to the reset pulse,
  • the first node performs a reset.
  • the reset module includes a first controlled switch unit, a control end of the first controlled switch unit and a first end connected to the third control signal input end, and a second end connected to the first node, And the threshold voltage is consistent with the level of the reset pulse.
  • the threshold compensation module includes a second controlled switch unit, a first end of the second controlled switch unit is connected to the third node, a second end is connected to the first node, and a control end is connected to the The second control signal input terminal.
  • the data voltage writing module includes a third controlled switch unit, a first end of the third controlled switch unit is connected to the data voltage input end, and a second end is connected to the second node, and the control end is Connecting the first control signal input terminal.
  • first control signal input end and the second control signal input end are the same input end; the third controlled switch unit and the second controlled switch unit have the same threshold voltage.
  • the data voltage writing module further includes a fourth controlled switch unit, The first end of the fourth controlled switch unit is connected to the data voltage input end, and the second end is connected to the second node.
  • a control end of the fourth controlled switch unit is connected to the third control signal input end, and a threshold voltage of the fourth controlled switch unit is consistent with a threshold voltage of the first controlled switch unit.
  • the data voltage writing module further includes a fifth controlled switch unit, the first end of the fifth controlled switch unit is connected to the working voltage input end, and the second end is connected to the second node, and is controlled.
  • the terminal is connected to the fourth control signal input terminal.
  • the pixel circuit further includes a sixth controlled switch unit, the first end of the sixth controlled switch unit is connected to the third node, and the second end is connected to the electroluminescent module.
  • control end of the sixth controlled switch unit is connected to the fourth control signal input end, and the threshold voltage is consistent with the threshold voltage of the fifth controlled switch unit.
  • each of the controlled switching units and the driving module are P-type transistors.
  • the present invention provides a method for driving the pixel circuit of any of the above, characterized in that the method comprises: a reset phase, a compensation phase, a data voltage writing phase and an illumination phase;
  • a reset pulse is applied to the third control signal input terminal to reset a voltage of the first node to a voltage corresponding to the reset pulse;
  • the compensation phase applying a control signal to the second control signal input terminal to cause the threshold compensation module to compensate the voltage of the first node as the sum of the threshold of the driving module and the voltage of the compensation voltage input terminal ;
  • the voltage of the first node is jumped by changing the voltage of the second node, so that the driving control module generates a driving current to drive the electroluminescent module to emit light.
  • the present invention provides a display device comprising the pixel circuit of any of the above.
  • the pixel circuit provided by the invention comprises a threshold compensation module, which can introduce a voltage for compensating the voltage input terminal, and set the voltage of the control terminal of the driving module to the sum of the threshold voltage of the driving module and the working voltage, so that the subsequent lighting process
  • the threshold voltage component included in the voltage of the control terminal of the driving module can be offset from the threshold voltage of the driving module, so that the driving current flowing through the electroluminescent unit can be prevented from being affected by the threshold voltage of the corresponding driving module.
  • FIG. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of one possible circuit of the data voltage writing module 400 of FIG. 1;
  • FIG. 3 is a circuit structural diagram of a pixel circuit according to an embodiment of the present invention.
  • FIG. 4 is a timing diagram of key input signals in a method of driving the pixel circuit of FIG. 3;
  • 5a-5c are schematic diagrams of current flow directions and key node voltage values of the pixel circuit of FIG. 3 at different timings.
  • the pixel circuit may include: a driving module 100 , an energy storage module 200 , an electroluminescent module 300 , a data voltage writing module 400 , and a threshold compensation module 500 .
  • And reset module 600 and has a working voltage input terminal Vdd, a data voltage input terminal Data, a first control signal input terminal S1, and a second control a signal input terminal S2, a third control signal input terminal S3; wherein the first end of the energy storage module 200 is connected to the first node a, and the second end is connected to the second node b;
  • the control end of the driving module 100 is connected to the first node a, the output end is connected to the third node d, and the input end is connected to the fourth node s, and is adapted to be connected to the working voltage input terminal Vdd when the fourth node s is connected, according to the first
  • the voltage of the node a generates a driving current for driving the electroluminescent module 300 to emit light to the third node d;
  • the data voltage writing module 400 is connected to the data voltage input terminal Data, the first control signal input terminal S1 and the second node b, and is adapted to connect the data voltage input terminal Data in response to the control signal input by the first control signal input terminal S1.
  • the incoming data voltage is written to the second node b;
  • the threshold compensation module 500 is connected to the first node a and the second control signal input terminal S2, and is adapted to compensate the voltage of the first node a to the driving module 100 in response to the control signal accessed by the second control signal input terminal S2.
  • the output end of the reset module 600 is connected to the first node a, and the input end and the control end are both connected to the third control signal input end S3, and are adapted to be turned on when the third control signal input end S3 is connected to the reset pulse. Resetting the first node a.
  • the pixel circuit provided by the invention comprises a threshold compensation module, which can introduce a voltage of the compensation voltage input terminal to set the voltage of the control terminal of the driving module to the sum of the threshold voltage and the working voltage of the driving module, so that in the subsequent illumination process
  • the threshold voltage component included in the voltage of the control terminal of the driving module can be offset from the threshold voltage of the driving module, so that the driving current flowing through the electroluminescent unit can be prevented from being affected by the threshold voltage of the corresponding driving module, and can be completely
  • the problem of uneven display brightness due to the threshold voltage drift of the driving transistor is solved.
  • the input end and the control end of the reset module are both connected to the third control signal input end, and the reset module is adapted to be turned on when the third control signal input end is connected to the reset pulse, A node a is reset, so that in a practical application, a signal line is connected to the input end and the control end of the reset module to reset the first node, which can reduce one signal line, thereby reducing pixel power.
  • the area occupied by the road is conducive to improving the resolution of the display device.
  • the reset module 600 may include a first controlled switch unit T1.
  • the control end of the first controlled switch unit T1 and the first end are connected to the third control signal input terminal S3, and the second end is connected.
  • the first node a, and the threshold voltage of the first controlled switching unit T1 is consistent with the level of the reset pulse.
  • the foregoing threshold compensation module 500 may specifically include a second controlled switch unit T2, the first end of the second controlled switch unit T2 is connected to the third node d, and the second end is connected to the first Node a, the control terminal is connected to the second control signal input terminal S2.
  • the data voltage writing module 400 may include a third controlled switching unit T3, and the first end of the third controlled switching unit T3 is connected to the data voltage input terminal Data.
  • the second end is connected to the second node b, and the control end is connected to the third control signal input end S3.
  • the threshold voltage of the third controlled switch unit T3 and the threshold voltage of the second controlled switch unit T2 may be the same, and the first control signal input terminal S1 and the second control signal input terminal S2 may be the same control. Signal input.
  • the threshold voltage coincides that the threshold voltage of the second controlled switching unit T2 is also a high level if the threshold voltage of the third controlled switching unit T3 is at a high level.
  • the threshold voltage of the second controlled switching unit T2 is also low.
  • the second controlled switch unit T2 and the third controlled switch unit T3 are connected to the same control signal input terminal, the conduction between the second controlled switch unit T2 and the third controlled switch unit T3 can be controlled by the same signal line. And turn off, this can also reduce the use of signal lines. It is not difficult to understand that in practical applications, the second controlled switch unit T2 and the third controlled switch unit T3 can also be connected to different control signal lines, and correspondingly, the second controlled switch unit T2 and the third controlled The threshold voltage of the switching unit T3 also does not need to be uniform.
  • the data voltage writing module 400 further includes a fourth controlled switching unit T4, and the first end of the fourth controlled switching unit T4 is connected to the data voltage input terminal Data, The two ends are connected to the second node b.
  • the advantage of setting the fourth controlled switching unit T4 is that the weight of the second node b can be realized by inputting a reset voltage at the data voltage input terminal Data and turning on the fourth switching unit T4 before the data voltage is written. Set.
  • the resetting of the second node b can also be implemented by other structures.
  • control terminal of the fourth controlled switch unit T4 herein may be connected to the third control signal input terminal S3, and the threshold voltage of the fourth controlled switch unit T4 should be the threshold value of the first controlled switch unit T1.
  • the voltage is consistent. This also reduces the number of signal lines.
  • control terminal of the fourth controlled switching unit T4 here can also be connected to a separate control signal input terminal.
  • the data voltage writing module 400 herein may further include a fifth controlled switching unit T5.
  • the first end of the fifth controlled switching unit T5 is connected to the working voltage input terminal Vdd, and the second The terminal is connected to the second node b, and the control terminal is connected to the fourth control signal input terminal S4.
  • the fourth controlled switch unit T4 and the fifth controlled switch unit T5 described above are not necessarily configured.
  • the process of resetting the second end of the energy storage module 200 and writing the data voltage can also be completed by applying a suitable control signal on the first control signal input terminal S1 and applying a suitable voltage signal to the data voltage input terminal Data. .
  • the structure shown in Fig. 2 should not be construed as limiting the scope of the invention.
  • the pixel circuit further includes a sixth controlled switch unit T6 (not shown), the first end of the sixth controlled switch unit T6 is connected to the third node d, and the second end is connected to the Electroluminescent module 300.
  • control end of the sixth controlled switch unit T6 may be connected to the fourth control signal input terminal S4, and the threshold voltage of the sixth controlled switch unit T6 and the fifth controlled switch unit T5 The threshold voltage is consistent.
  • each of the above-mentioned controlled switching units and the driving module 100 may be P-type transistors, which has the advantage of being able to be fabricated by the same process, which reduces the complexity of manufacturing the corresponding display device.
  • P-type transistors P-type transistors
  • a part of the controlled switch units of the above controlled switch units or all of the controlled switch units may also be replaced by N. Type transistor.
  • Corresponding technical solutions can also solve the technical problems to be solved by the present invention, and should also fall within the scope of protection of the present invention.
  • the energy storage module 200 herein may specifically include a capacitor.
  • other components with energy storage functions can be used according to design requirements.
  • the electroluminescent module 300 herein may specifically include an organic electroluminescent element OLED having an anode connected to the fourth switching unit and a cathode connected to the low voltage end.
  • OLED organic electroluminescent element
  • the present invention provides a driving method of a pixel circuit, which can be used to drive the pixel circuit of any of the above, the method comprising: a reset phase, a compensation phase, a data voltage writing phase, and an illumination phase; ,
  • a reset pulse is applied to the third control signal input terminal to reset a voltage of the first node to a voltage corresponding to the reset pulse;
  • a control signal is applied to the second control signal input end, so that the threshold compensation module compensates the voltage of the first node to the threshold voltage of the driving module and the voltage of the compensation voltage input terminal.
  • the voltage of the first node is jumped by changing the voltage of the second node, so that the driving control module generates a driving current to drive the electroluminescent module to emit light.
  • the driving current flowing through the electroluminescent unit can be prevented from being affected by the threshold voltage of the corresponding driving module, and the problem of uneven display brightness due to the threshold voltage drift of the driving module is completely solved.
  • the control of the illumination phase may be different.
  • the pixel circuit includes the fifth controlled switch unit T5 and the sixth controlled switch unit T6 described above, the fifth controlled switch unit T5 and the sixth controlled switch unit T6 need to be turned on, so that the first aspect can be adjusted.
  • the voltage of the two nodes makes the first The voltage of one node jumps to keep the drive module on.
  • the current generated by the driving module is caused to flow to the electroluminescent unit through the sixth controlled switching unit T6.
  • the third controlled switching unit T3 can be continuously turned on, and a different data voltage is applied to the data voltage input terminal Data. Adjusting the voltage of the second node causes the voltage of the first node to jump, so that the driving module continues to be turned on.
  • the compensation phase and the data voltage writing phase may be the same phase, that is, the process of threshold compensation and data voltage writing are performed simultaneously.
  • FIG. 3 is a schematic circuit diagram of a possible pixel circuit, including six T1-T6.
  • P-type switching transistor, a P-type driving transistor DT, an electroluminescent element OLED and a capacitor C wherein the switching transistor switch T1 constitutes a reset module, the switching transistor T2 constitutes a threshold compensation module, and the switching transistors T3, T4, T5 constitute a data voltage
  • the writing module, the capacitor C constitutes the energy storage module, and the driving transistor DT constitutes a driving module;
  • the pixel circuit further has an operating voltage input terminal Vdd, a data voltage input terminal Data, and a control signal input terminal S1, S3, S4; wherein, the capacitor C One end is connected to the first node a, and the other end is connected to the second node b; the source of the driving transistor DT is connected to the fourth node s, the drain is connected to the third node
  • the signal input terminal S1; the drains of the switching transistors T3, T4 and T5 are all connected to the second node b; the sources of the switching transistors T3 and T4 are connected to the data voltage input terminal Vdata; the gate of the switching transistor T3 is connected to the control signal input terminal S1
  • the gate of the switching transistor T4 is connected to the third control signal input terminal S3; the gates of the switching transistor T5 and the switching transistor T6 are connected to the fourth control signal input terminal S4, and the source of the switching transistor T5 is connected to the working voltage input terminal Vdd;
  • the switching transistor The source of T6 is connected to the third node d, and the drain is connected to the anode of the electroluminescent element OLED; the cathode of the electroluminescent element OLED is connected to a low voltage terminal VSS.
  • FIG. 4 is a key signal used in the driving method for driving the pixel circuit of FIG. Timing diagram, including:
  • a reset pulse (low level) is applied to the control signal input terminal S3 to turn on the switching transistors T1 and T4, and a high level is applied to the other control signal input terminals, so that other switching transistors are turned off.
  • a reset voltage (assumed to be 0) is applied to the data voltage input terminal Data.
  • a low level is applied at the control signal input terminal S1, the switching transistor T2 and the switching transistor T3 are turned on, and a high level is applied to the other control signal input terminals, so that other switching transistors are turned off. Break, and apply the data voltage Vdata at the data voltage input end (the figure shows the case where the data voltage is a positive voltage. In practical applications, the data voltage here may also be a negative voltage according to the display requirements, and is not performed here. Detailed description). As shown in FIG.
  • the operating voltage input terminal Vdd charges the first node a via the driving transistor DT and the switching transistor T2 until the voltage of the first node a reaches Vdd+Vth (at this time, the switching condition of the driving transistor DT is reached, where Vth is the threshold voltage of the driving transistor DT, which is a negative value here.
  • Vth is the threshold voltage of the driving transistor DT, which is a negative value here.
  • the data voltage Vdata is written to the second node b due to the conduction of the switching transistor T3. At this time, the voltage difference between the first node a and the second node b is Vdd+Vth-Vdata.
  • a low level is applied to the control signal input terminal S4, and a high level is applied to the other control signal input terminals.
  • the switching transistors T5 and T6 are turned on, and the other switching transistors are turned off.
  • the operating voltage access terminal Vdd is connected to the second node b via the switching transistor T5.
  • the voltage of the second node is set to Vdd, and since the first node a is floating, the voltage of the first node a jumps and jumps to 2Vdd+Vth-Vdata (the voltage difference across the capacitor C is Vdd+Vth-Vdata).
  • the switching transistor T6 Due to the conduction of the switching transistor T6, the operating voltage input terminal Vdd supplies current to the electroluminescent element OLED through the driving transistor DT and the switching transistor T6, causing the electroluminescent element OLED to emit light.
  • I OLED K(2Vdd+Vth-Vdata-Vdd-Vth) 2
  • the operating current I OLED is not affected by the threshold voltage Vth of the driving transistor, and is only related to the data voltage Vdata.
  • the problem that the threshold voltage Vth drifts due to the process process and long-time operation of the driving transistor DT is completely solved, the influence on the I OLED is eliminated, and the normal operation of the OLED of the electroluminescent element is ensured.
  • the present invention also provides a display device comprising the pixel circuit of any of the above.
  • the display device here can be: electronic paper, mobile phone, tablet computer, television, display, notebook computer, digital photo frame, navigator and the like with any display product or component.

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Abstract

一种像素电路及其驱动方法、显示装置，该像素电路包括：驱动模块（100）、储能模块（200）、电致发光模块（300）、数据电压写入模块（400）、阈值补偿模块（500）和复位模块（600），并具有工作电压输入端（Vdd）、数据电压输入端（Data）和多个控制信号输入端。该阈值补偿模块（500）能够引入补偿电压入端的电压将驱动模块（100）的控制端的电压置为驱动模块（100）的阈值电压（Vth）与工作电压之和，这样在后续的发光过程中，能够使得驱动模块（100）的控制端的电压中所包含的阈值电压分量与驱动模块（100）的阈值电压（Vth）抵消，进而能够使得流经电致发光单元的驱动电流不受对应的驱动模块（100）的阈值电压（Vth）的影响，能够彻底解决由于驱动晶体管（DT）的阈值电压漂移导致显示亮度不均的问题。

Description

像素电路及其驱动方法、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、显示装置。
背景技术
有机发光二极管(Organic Light Emitting Diode，OLED)是当今平板显示器研究领域的热点之一，作为一种电流型发光器件，因其所具有的自发光、快速响应、宽视角和可制作在柔性衬底上等特点而越来越多地被应用于高性能显示领域当中。目前，在手机、PDA、数码相机等显示领域OLED已经开始取代传统的液晶显示屏(LCD,Liquid Crystal Display)。像素驱动电路设计是OLED显示器核心技术内容，具有重要的研究意义。与TFT(Thin Film Transistor,薄膜场效应晶体管)-LCD利用稳定的电压控制亮度不同，OLED属于电流驱动，需要稳定的电流来控制发光。由于工艺制程和器件老化等原因，在原始的2T1C驱动电路(包括两个薄膜场效应晶体管和一个电容)中，各像素点的驱动TFT的阈值电压存在不均匀性，这样就导致了流过每个像素点OLED的电流发生变化使得显示亮度不均，从而影响整个图像的显示效果。
发明内容
本发明的一个目的提供一种像素电路，以避免因阈值漂移导致的显示亮度不均。
第一方面，本发明提供了一种像素电路，包括：驱动模块、储能模块、电致发光模块、数据电压写入模块、阈值补偿模块和复位模块，并具有工作电压输入端、数据电压输入端和多个控制信号输入端；其中，所述储能模块的第一端连接第一节点，第二端连接第二节点；
所述驱动模块的控制端与所述第一节点相连，输出端与第三节点相连，适于在所述驱动模块的第一端接入工作电压输入端时，根据所述第一节点的电压产生用于驱动所述电致发光模块发光的驱动电流并输出到所述第三节点；
所述数据电压写入模块与第一控制信号输入端、所述数据电压输入端以及所述第二节点相连，适于响应于所述第一控制信号输入端接入的控制信号将所述数据电压输入端所接入的数据电压写入到所述第二节点；
所述阈值补偿模块与所述第一节点和第二控制信号输入端相连，适于响应于所述第二控制信号输入端接入的控制信号将所述第一节点的电压补偿为所述驱动模块的阈值电压与所述工作电压输入端所接入的电压之和；
所述复位模块的输出端与所述第一节点相连，输入端和控制端与第三控制信号输入端相连，适于在所述第三控制信号输入端接入复位脉冲时开启，对所述第一节点进行复位。
进一步的，所述复位模块包括第一受控开关单元，所述第一受控开关单元的控制端以及第一端连接所述第三控制信号输入端，第二端连接所述第一节点，且阈值电压与所述复位脉冲的电平一致。
进一步的，所述阈值补偿模块包括第二受控开关单元，所述第二受控开关单元的第一端连接所述第三节点，第二端连接所述第一节点，控制端连接所述第二控制信号输入端。
进一步的，所述数据电压写入模块包括第三受控开关单元，所述第三受控开关单元的第一端连接所述数据电压输入端，第二端连接所述第二节点，控制端连接所述第一控制信号输入端。
进一步的，所述第一控制信号输入端与所述第二控制信号输入端为同一输入端；所述第三受控开关单元与所述第二受控开关单元的阈值电压一致。
进一步的，所述数据电压写入模块还包括第四受控开关单元，所 述第四受控开关单元的第一端连接数据电压输入端，第二端连接所述第二节点。
进一步的，所述第四受控开关单元的控制端连接所述第三控制信号输入端，且所述第四受控开关单元的阈值电压与所述第一受控开关单元的阈值电压一致。
进一步的，所述数据电压写入模块还包括第五受控开关单元，所述第五受控开关单元的第一端连接所述工作电压输入端，第二端连接所述第二节点，控制端连接第四控制信号输入端。
进一步的，所述像素电路还包括第六受控开关单元，所述第六受控开关单元的第一端连接所述第三节点，第二端连接所述电致发光模块。
进一步的，所述第六受控开关单元的控制端连接所述第四控制信号输入端，且阈值电压与所述第五受控开关单元的阈值电压一致。
进一步的，各个受控开关单元以及驱动模块均为P型晶体管。
第二方面，本发明还提供了一种驱动上述任一项所述的像素电路的方法，其特征在于，该方法包括：复位阶段、补偿阶段、数据电压写入阶段和发光阶段；其中，
在复位阶段，在所述第三控制信号输入端施加复位脉冲，将所述第一节点的电压复位为所述复位脉冲对应的电压；
在补偿阶段，在所述第二控制信号输入端施加控制信号使所述阈值补偿模块将所述第一节点的电压补偿为所述驱动模块的阈值与补偿电压输入端所接入的电压之和；
在数据电压写入阶段，在所述第一控制信号输入端施加控制信号使所述数据电压写入模块开启，将数据电压接入端的电压写入到所述第二节点；
在发光阶段，通过改变所述第二节点的电压使所述第一节点的电压跳变，以使所述驱动控制模块产生驱动电流驱动所述电致发光模块发光。
第三方面，本发明还提供了一种显示装置，包括上述任一项所述的像素电路。
本发明提供的像素电路，包含阈值补偿模块，该阈值补偿模块能够引入补偿电压输入端的电压，将驱动模块的控制端的电压置为驱动模块的阈值电压与工作电压之和，这样在后续的发光过程中，能够使得驱动模块的控制端的电压中所包含的阈值电压分量与驱动模块的阈值电压抵消，进而能够使得流经电致发光单元的驱动电流不受对应的驱动模块的阈值电压的影响，能够彻底解决由于驱动晶体管的阈值电压漂移导致显示亮度不均的问题。
附图说明
图1为本发明一实施例提供的一种像素电路的结构示意图；
图2为图1中的数据电压写入模块400的一种可能的电路示意图；
图3为本发明一实施例提供的像素电路的电路结构图；
图4为驱动图3中的像素电路的方法中关键输入信号的时序图；
图5a-图5c为图3中的像素电路在不同时序下的电流流向和关键节点电压值的示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整的描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明的实施例，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的实施例，都属于本发明保护的范围。
本发明一实施例提供了一种像素电路，如图1所示，该像素电路可以包括：驱动模块100、储能模块200、电致发光模块300、数据电压写入模块400、阈值补偿模块500和复位模块600，并具有工作电压输入端Vdd、数据电压输入端Data、第一控制信号输入端S1、第二控 制信号输入端S2，第三控制信号输入端S3；其中，储能模块200的第一端连接第一节点a，第二端连接第二节点b；
驱动模块100的控制端与第一节点a相连，输出端与第三节点d相连，输入端与第四节点s相连，适于在第四节点s接入工作电压输入端Vdd时，根据第一节点a的电压产生用于驱动电致发光模块300发光的驱动电流输出到第三节点d；
数据电压写入模块400与数据电压输入端Data、第一控制信号输入端S1以及第二节点b相连，适于响应于第一控制信号输入端S1接入的控制信号将数据电压输入端Data接入的数据电压写入到第二节点b；
阈值补偿模块500与第一节点a以及第二控制信号输入端S2相连，适于响应于第二控制信号输入端S2接入的控制信号将第一节点a的电压补偿为所述驱动模块100的阈值电压Vth与工作电压输入端Vdd所接入的电压之和；
所述复位模块600的输出端与所述第一节点a相连，输入端及控制端均连接第三控制信号输入端S3，适于在所述第三控制信号输入端S3接入复位脉冲时开启，对所述第一节点a进行复位。
本发明提供的像素电路，包含阈值补偿模块，该阈值补偿模块能够引入补偿电压入端的电压将驱动模块的控制端的电压置为驱动模块的阈值电压与工作电压之和，这样在后续的发光过程中，能够使得驱动模块的控制端的电压中所包含的阈值电压分量与驱动模块的阈值电压抵消，进而能够使得流经电致发光单元的驱动电流不受对应的驱动模块的阈值电压的影响，能够彻底解决由于驱动晶体管的阈值电压漂移导致显示亮度不均的问题。并且，本发明实施例中，复位模块的输入端及控制端均连接第三控制信号输入端，该复位模块适于在所述第三控制信号输入端接入复位脉冲时开启，对所述第一节点a进行复位，这样在实际应用中，使用一条信号线连接复位模块的输入端及控制端即可实现对第一节点的复位，能够减少一条信号线，从而降低像素电 路所占用的面积，利于提高显示装置的分辨率。
在具体实施时，上述的复位模块600可以包括一个第一受控开关单元T1，第一受控开关单元T1的控制端以及第一端连接所述第三控制信号输入端S3，第二端连接所述第一节点a，且第一受控开关单元T1的阈值电压与所述复位脉冲的电平一致。
在具体实施时，上述的阈值补偿模块500可以具体包括一个第二受控开关单元T2，第二受控开关单元T2的第一端连接所述第三节点d，第二端连接所述第一节点a，控制端连接第二控制信号输入端S2。
在具体实施时，如图2所示，上述的数据电压写入模块400可以包括第三受控开关单元T3，所述第三受控开关单元T3的第一端连接所述数据电压输入端Data，第二端连接所述第二节点b，控制端连接所述第三控制信号输入端S3。
在具体实施时，这里的第三受控开关单元T3的阈值电压与第二受控开关单元T2的阈值电压可以一致，第一控制信号输入端S1与第二控制信号输入端S2可以为同一控制信号输入端。
这里的阈值电压一致是指，如果第三受控开关单元T3的阈值电压为高电平，则第二受控开关单元T2的阈值电压也为高电平。相应的，如果第三受控开关单元T3的阈值电压为低电平，则第二受控开关单元T2的阈值电压也为低电平。
由于第二受控开关单元T2与第三受控开关单元T3连接同一个控制信号输入端，则可以通过同一条信号线控制第二受控开关单元T2与第三受控开关单元T3的导通和关断，这样也能够减少信号线的使用。不难理解的是，在实际应用中，第二受控开关单元T2和第三受控开关单元T3也可以连接不同的控制信号线，相应的，第二受控开关单元T2和第三受控开关单元T3的阈值电压也无需一致。
在具体实施时，如图2所示，所述数据电压写入模块400还包括第四受控开关单元T4，所述第四受控开关单元T4的第一端连接数据电压输入端Data，第二端连接所述第二节点b。
设置第四受控开关单元T4的好处是，能够使得在数据电压写入之前，通过在数据电压输入端Data输入一个重置电压并导通第四开关单元T4可以实现对第二节点b的重置。当然在实际应用中，也可以通过其他结构实现对第二节点b的重置。
在具体实施时，这里的第四受控开关单元T4的控制端可以连接第三控制信号输入端S3，此时第四受控开关单元T4的阈值电压应与第一受控开关单元T1的阈值电压一致。这样也能减少信号线的数量。当然在实际应用中，这里的第四受控开关单元T4的控制端也可以连接单独的一个控制信号输入端。
在具体实施时，如图2所示，这里的数据电压写入模块400还可以包括第五受控开关单元T5，第五受控开关单元T5的第一端连接工作电压输入端Vdd，第二端连接所述第二节点b，控制端连接第四控制信号输入端S4。
不难理解，在实际应用中，上述的第四受控开关单元T4和第五受控开关单元T5均不是必须设置的结构。通过在第一控制信号输入端S1上施加合适的控制信号，并在数据电压输入端Data施加合适的电压信号，也能够完成对储能模块200第二端进行重置、数据电压写入的过程。图2所示的结构不应该理解为对本发明保护范围的限定。
在具体实施时，所述像素电路还包括图中未示出的第六受控开关单元T6，第六受控开关单元T6的第一端连接所述第三节点d，第二端连接所述电致发光模块300。
进一步的，在具体实施时，第六受控开关单元T6的控制端可以连接第四控制信号输入端S4，且第六受控开关单元T6的阈值电压与所述第五受控开关单元T5的阈值电压一致。
在具体实施时，上述的各个受控开关单元以及驱动模块100可以均为P型晶体管，这样做的好处是能够采用同一的工艺制作，降低了制作相应显示装置的复杂度。当然在实际应用中，上述各个受控开关单元的一部分受控开关单元或者全部的受控开关单元也可以替换为N 型晶体管。相应的技术方案同样能够解决本发明所要解决的技术问题，也应该落入本发明的保护范围。
在具体实施时，这里的储能模块200可以具体包括一个电容。当然实际应用中，根据设计需要也可以采用其他具有储能功能的元件。
在具体实施时，这里的电致发光模块300可以具体包括一个有机电致发光元件OLED，该有机电致发光元件OLED的阳极连接在第四开关单元，阴极连接低电压端。
另一方面，本发明还提供了一种像素电路的驱动方法，可用于驱动上述任一项所述的像素电路，该方法包括：复位阶段、补偿阶段、数据电压写入阶段以及发光阶段；其中，
在复位阶段，在所述第三控制信号输入端施加复位脉冲，将所述第一节点的电压复位为所述复位脉冲对应的电压；
在补偿阶段，在所述第二控制信号输入端施加控制信号，使所述阈值补偿模块将所述第一节点的电压补偿为所述驱动模块的阈值电压与补偿电压输入端所接入的电压之和；
在数据电压写入阶段，在所述第一控制信号输入端施加控制信号使所述数据电压写入模块开启，将数据电压接入端的电压写入到所述第二节点；
在发光阶段，通过改变所述第二节点的电压使所述第一节点的电压跳变，以使所述驱动控制模块产生驱动电流驱动所述电致发光模块发光。
通过本发明提供的驱动方法，可以使得流经电致发光单元的驱动电流不受对应的驱动模块的阈值电压的影响，彻底解决了由于驱动模块的阈值电压漂移导致显示亮度不均的问题。
在具体实施时，具体到不同的像素电路结构中，对所述发光阶段的控制可能不尽相同。比如当像素电路包括上述的第五受控开关单元T5和第六受控开关单元T6时，需要将第五受控开关单元T5以及第六受控开关单元T6导通，这样一方面能够调整第二节点的电压使所述第 一节点的电压发生跳变，以使驱动模块继续开启。另一方面，使驱动模块产生的电流通过第六受控开关单元T6流向电致发光单元。当上述的像素电路不包括第五受控开关单元T5时，则在发光阶段，可以通过使第三受控开关单元T3继续导通，并在数据电压输入端Data上施加不同的数据电压，以调整第二节点的电压使所述第一节点的电压发生跳变，以使驱动模块继续开启。
在具体实施时，上述的补偿阶段和数据电压写入阶段可以为同一阶段，即阈值补偿和数据电压写入的过程同时进行。
下面结合一种具体的电路结构对本发明实施例提供的一种像素电路的驱动方法和工作原理进行说明，如图3所示为一种可能的像素电路的电路示意图，包括T1-T6共六个P型开关晶体管、一个P型驱动晶体管DT、一个电致发光元件OLED和一个电容C，其中开关晶体管开关T1构成复位模块、开关晶体管T2构成阈值补偿模块、开关晶体管T3、T4、T5构成数据电压写入模块、电容C构成储能模块、驱动晶体管DT构成驱动模块；该像素电路还具有工作电压输入端Vdd，数据电压输入端Data，控制信号输入端S1、S3、S4；其中，电容C的一端连接第一节点a，另一端连接第二节点b；驱动晶体管DT的源极连接第四节点s，漏极连接第三节点d；开关晶体管T1和T2的漏极均连接第一节点a，开关晶体管T1的栅极和源极均连接第三控制信号输入端S3；开关晶体管T2的源极连接第三节点d，栅极连接控制信号输入端S1；开关晶体管T3、T4和T5的漏极均连接第二节点b；开关晶体管T3和T4的源极均连接数据电压输入端Vdata；开关晶体管T3的栅极连接控制信号输入端S1，开关晶体管T4的栅极连接第三控制信号输入端S3；开关晶体管T5和开关晶体管T6的栅极连接第四控制信号输入端S4，开关晶体管T5的源极连接工作电压输入端Vdd；开关晶体管T6的源极连接第三节点d，漏极连接电致发光元件OLED的阳极；电致发光元件OLED的阴极连接一低电压端VSS。
图4为用于对图3的像素电路进行驱动的驱动方法中关键信号的 时序图，具体包括：
复位阶段Stg1，在控制信号输入端S3施加复位脉冲(低电平)，使开关晶体管T1和T4导通，并在其他各个控制信号输入端施加高电平，使其他开关晶体管均关断，此时数据电压输入端Data上施加一个重置电压(假设为0)。此时，如图5a所示，电容C的第一端沿开关晶体管T1放电，第二端沿开关晶体管T1和开关晶体管T4放电，电容C的第一端所连接的第一节点a的电压被拉低，同时电容C的第二端所连接的第二节点b的电压也被复位。
补偿及数据电压写入阶段Stg2，在控制信号输入端S1施加低电平，使开关晶体管T2和开关晶体管T3导通，并在其他各个控制信号输入端施加高电平，使其他开关晶体管均关断，并在数据电压输入端施加数据电压Vdata(图中示出的是数据电压为正电压的情况，在实际应用中，根据显示需要，这里的数据电压也可能为负电压，在此不进行详细说明)。如图5b所示，工作电压输入端Vdd经驱动晶体管DT、开关晶体管T2向第一节点a充电，直到第一节点a的电压达到Vdd+Vth(此时达到驱动晶体管DT的截止条件，这里的Vth为驱动晶体管DT的阈值电压，在这里为负值)。这个阶段，由于开关晶体管T6被关断，此时电致发光元件OLED不会发光，延长了电致发光元件OLED的使用寿命。由于开关晶体管T3的导通，使得数据电压Vdata写入到第二节点b。此时第一节点a和第二节点b之间的压差为Vdd+Vth-Vdata。
发光阶段Stg3，在控制信号输入端S4上施加低电平，在其他控制信号输入端均施加高电平，此时开关晶体管T5和T6导通，其他开关晶体管均关断。如图5c所示，工作电压接入端Vdd经开关晶体管T5接入第二节点b。此时第二节点的电压被置为Vdd，而由于第一节点a浮接，此时第一节点a的电压发生跳变，跳变为2Vdd+Vth-Vdata(保持电容C两端的压差为Vdd+Vth-Vdata)。由于开关晶体管T6的导通，工作电压输入端Vdd通过驱动晶体管DT和开关晶体管T6向电致发光元件OLED提供电流，使电致发光元件OLED发光。
由于驱动晶体管DT的栅极电压为2Vdd+Vth-Vdata，则根据由TFT饱和电流公式可以得到：
IOLED＝K(2Vdd+Vth-Vdata-Vdd-Vth)2
＝K(2Vdd+Vth-Vdata-Vdd-Vth)2
＝K(Vdd-Vdata)2
由上式中可以看到此时工作电流IOLED不受驱动晶体管的阈值电压Vth的影响，只与数据电压Vdata有关。彻底解决了驱动晶体管DT由于工艺制程及长时间的操作造成阈值电压Vth漂移的问题，消除其对IOLED的影响，保证电致发光元件OLED的正常工作。
本发明还提供了一种显示装置，包括上述任一项所述的像素电路。
这里的显示装置可以为：电子纸、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，仅为本发明的具体实施方式，但是，本发明的保护范围不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替代，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (13)

  1. 一种像素电路，其特征在于，包括：驱动模块、储能模块、电致发光模块、数据电压写入模块、阈值补偿模块和复位模块，并具有工作电压输入端、数据电压输入端和多个控制信号输入端；其中，所述储能模块的第一端连接第一节点，第二端连接第二节点；
    所述驱动模块的控制端与所述第一节点相连，输出端与第三节点相连，适于在所述驱动模块的第一端接入工作电压输入端时，根据所述第一节点的电压产生用于驱动所述电致发光模块发光的驱动电流并输出到所述第三节点；
    所述数据电压写入模块与第一控制信号输入端、所述数据电压输入端以及所述第二节点相连，适于响应于所述第一控制信号输入端接入的控制信号将所述数据电压输入端所接入的数据电压写入到所述第二节点；
    所述阈值补偿模块与所述第一节点和第二控制信号输入端相连，适于响应于所述第二控制信号输入端接入的控制信号将所述第一节点的电压补偿为所述驱动模块的阈值电压与所述工作电压输入端所接入的电压之和；
    所述复位模块的输出端与所述第一节点相连，输入端和控制端与第三控制信号输入端相连，适于在所述第三控制信号输入端接入复位脉冲时开启，对所述第一节点进行复位。
  2. 如权利要求1所述的像素电路，其特征在于，所述复位模块包括第一受控开关单元，所述第一受控开关单元的控制端以及第一端连接所述第三控制信号输入端，第二端连接所述第一节点，且阈值电压与所述复位脉冲的电平一致。
  3. 如权利要求1所述的像素电路，其特征在于，所述阈值补偿模块包括第二受控开关单元，所述第二受控开关单元的第一端连接所述第三节点，第二端连接所述第一节点，控制端连接所述第二控制信号 输入端。
  4. 如权利要求1所述的像素电路，其特征在于，所述数据电压写入模块包括第三受控开关单元，所述第三受控开关单元的第一端连接所述数据电压输入端，第二端连接所述第二节点，控制端连接所述第一控制信号输入端。
  5. 如权利要求4所述的像素电路，其特征在于，所述第一控制信号输入端与所述第二控制信号输入端为同一输入端；所述第三受控开关单元与所述第二受控开关单元的阈值电压一致。
  6. 如权利要求5所述的像素电路，其特征在于，所述数据电压写入模块还包括第四受控开关单元，所述第四受控开关单元的第一端连接数据电压输入端，第二端连接所述第二节点。
  7. 如权利要求6所述的像素电路，其特征在于，所述第四受控开关单元的控制端连接所述第三控制信号输入端，且所述第四受控开关单元的阈值电压与所述第一受控开关单元的阈值电压一致。
  8. 如权利要求4所述的像素电路，其特征在于，所述数据电压写入模块还包括第五受控开关单元，所述第五受控开关单元的第一端连接所述工作电压输入端，第二端连接所述第二节点，控制端连接第四控制信号输入端。
  9. 如权利要求8所述的像素电路，其特征在于，所述像素电路还包括第六受控开关单元，所述第六受控开关单元的第一端连接所述第三节点，第二端连接所述电致发光模块。
  10. 如权利要求9所述的像素电路，其特征在于，所述第六受控开关单元的控制端连接所述第四控制信号输入端，且阈值电压与所述第五受控开关单元的阈值电压一致。
  11. 如权利要求1-10任一项所述的像素电路，其特征在于，各个受控开关单元以及驱动模块均为P型晶体管。
  12. 一种驱动如权利要求1-11任一项所述的像素电路的方法，其特征在于，该方法包括：复位阶段、补偿阶段、数据电压写入阶段和 发光阶段；其中，
    在复位阶段，在所述第三控制信号输入端施加复位脉冲，将所述第一节点的电压复位为所述复位脉冲对应的电压；
    在补偿阶段，在所述第二控制信号输入端施加控制信号使所述阈值补偿模块将所述第一节点的电压补偿为所述驱动模块的阈值电压与补偿电压输入端所接入的电压之和；
    在数据电压写入阶段，在所述第一控制信号输入端施加控制信号使所述数据电压写入模块开启，将数据电压接入端的电压写入到所述第二节点；
    在发光阶段，通过改变所述第二节点的电压使所述第一节点的电压跳变，以使所述驱动控制模块产生驱动电流驱动所述电致发光模块发光。
  13. 一种显示装置，其特征在于，包括如权利要求1-11任一项所述的像素电路。
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