WO2018120701A1 - 一种像素电路、其驱动方法、显示面板及显示装置 - Google Patents

一种像素电路、其驱动方法、显示面板及显示装置 Download PDF

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Publication number
WO2018120701A1
WO2018120701A1 PCT/CN2017/090802 CN2017090802W WO2018120701A1 WO 2018120701 A1 WO2018120701 A1 WO 2018120701A1 CN 2017090802 W CN2017090802 W CN 2017090802W WO 2018120701 A1 WO2018120701 A1 WO 2018120701A1
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Prior art keywords
node
input
control
signal
switching transistor
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PCT/CN2017/090802
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English (en)
French (fr)
Inventor
江鹏
杨海鹏
戴珂
尹傛俊
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京东方科技集团股份有限公司
合肥鑫晟光电科技有限公司
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Priority to US15/745,809 priority Critical patent/US10510297B2/en
Publication of WO2018120701A1 publication Critical patent/WO2018120701A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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
    • G09G3/3233—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 current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • 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
    • G09G2300/0866—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 by means of changes in the pixel supply voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, a display panel, and a display device.
  • AMOLED Active Matrix Organic Light Emitting Diode
  • TFT LCD Thin Film Transistor Liquid Crystal Display
  • the driving transistor drives the light emitting device OLED to emit light
  • the brightness of the OLED is relatively sensitive to the change of the driving current thereof, and the driving transistor cannot be completely consistent in the manufacturing process, and
  • the process variation and the aging of the device, as well as the temperature change during operation, etc. cause non-uniformity in the threshold voltage Vth of the driving transistor in each pixel circuit, which causes the current of the OLED flowing through each pixel to occur.
  • the change causes the display brightness to be uneven, thereby affecting the display effect of the entire image.
  • Embodiments of the present disclosure provide a pixel circuit, a driving method thereof, a display panel, and a display device.
  • An embodiment of the present disclosure provides a pixel circuit, including: a charging module, a driving module, a compensation module, an adjustment module, and a light emitting device; wherein
  • the first control end and the second control end of the charging module are configured to input a first control signal, the third control end is configured to input a second control signal, the first input end is used to input a first power supply signal, and the second input end is used For inputting a data signal, the first output end is connected to the first node, and the second output end is connected to the second node;
  • the control end of the driving module is connected to the third node, the input end is configured to input the first power signal, and the output end is connected to the input end of the light emitting device;
  • the first control end of the compensation module is configured to input the first control signal, the second control end and the first input end are both connected to the first node, and the second input end is configured to input a second power supply signal, and output The end is connected to the third node;
  • the control end of the adjustment module is configured to input the first control signal, and the input end is configured to input a reference voltage signal, the first output end is connected to the first node, and the second output end is connected to the second node, The third output is connected to the third node;
  • the output end of the light emitting device is configured to access a third power signal
  • the charging module is configured to output the first power signal to the first node under the control of the first control signal and the second control signal, and output the data signal to The second node; in the compensation phase, the compensation module is configured to perform threshold voltage on the third node by using the second power signal under the control of the first control signal and the first node Compensating; in the adjusting phase, the adjusting module is configured to adjust potentials of the first node, the second node, and the third node by using the reference voltage signal under control of the first control signal; In the illuminating phase, the driving module is configured to drive the illuminating device to emit light by the first power signal under the control of the third node.
  • the charging module includes: a first charging unit and a second charging unit;
  • the first control end of the first charging unit is configured to input the first control signal
  • the second control end is configured to input the second control signal
  • the input end is configured to input the first power signal
  • the output end is The first node is connected to the first node;
  • the first charging unit is configured to output the first power signal to the first node under the control of the first control signal and the second control signal;
  • the control end of the second charging unit is configured to input the first control signal, input The end is configured to input the data signal, and the output end is connected to the second node; the second charging unit is configured to output the data signal to the second node under control of the first control signal .
  • the first charging unit includes: a first switching transistor and a second switching transistor; wherein
  • a gate of the first switching transistor is configured to input the first control signal, a source is used to input the first power signal, and a drain is connected to a source of the second switching transistor;
  • the gate of the second switching transistor is used to input the second control signal, and the drain is connected to the first node.
  • the second charging unit includes: a third switching transistor
  • the gate of the third switching transistor is used to input the first control signal, the source is used to input the data signal, and the drain is connected to the second node.
  • the driving module includes: a fourth switching transistor;
  • the gate of the fourth switching transistor is connected to the third node, the source is used for inputting the first power signal, and the drain is connected to the input end of the light emitting device.
  • the compensation module includes: a fifth switching transistor and a sixth switching transistor; wherein
  • a gate of the fifth switching transistor is connected to the first node, a source is used for inputting the second power signal, and a drain is connected to the third node;
  • the gate of the sixth switching transistor is configured to input the first control signal, the source is connected to the first node, and the drain is connected to the third node.
  • the adjustment module includes: a seventh switching transistor, a first capacitor, and a second capacitor; wherein
  • a gate of the seventh switching transistor is configured to input the first control signal, a source is used to input the reference voltage signal, and a drain is respectively connected to one end of the first capacitor and the The second node is connected;
  • the other end of the first capacitor is connected to the first node
  • the second capacitor is coupled between the second node and the third node.
  • An embodiment of the present disclosure provides a driving method of the above pixel circuit according to an embodiment of the present disclosure, including:
  • the charging module In the charging phase, the charging module outputs the first power signal to the first node under the control of the first control signal and the second control signal, and outputs the data signal to the Second node;
  • the compensation module performs threshold voltage compensation on the third node by using the second power signal under the control of the first control signal and the first node;
  • the adjustment module adjusts potentials of the first node, the second node, and the third node by using the reference voltage signal under control of the first control signal;
  • the driving module drives the illuminating device to emit light through the first power signal under the control of the third node.
  • Embodiments of the present disclosure provide a pixel circuit including: a charging module that outputs a data signal to a first node and a third node in response to a first control signal and a second control signal; and a driving module responsive to the third node a signal level, the first power signal is used to output a driving voltage; and the compensation module is configured to perform a threshold voltage compensation on the third node by using the second power signal in response to the first control signal and the potential of the first node And a light emitting device that emits light under the driving of the driving voltage.
  • the foregoing pixel circuit provided by the embodiment of the present disclosure further includes: an adjustment module, configured to adjust the first node and the third node by using a reference voltage in response to the first control signal Potential.
  • the compensation module includes: a fifth switching transistor, a gate of the fifth switching transistor is connected to the first node, and a source a second power supply signal, a drain connected to the third node; and a sixth switching transistor; wherein a gate of the sixth switching transistor is configured to input the first control signal, a source and a The first node is connected, and the drain Connected to the third node.
  • the adjustment module includes: a seventh switching transistor, a first capacitor, and a second capacitor, wherein the first end of the first capacitor is connected to a first node, a second end connected to a drain of the seventh switching transistor, a gate of the seventh switching transistor for inputting the first control signal, and a source for inputting the reference voltage signal a drain is coupled to the second end of the first capacitor and the second node, and a first end of the second capacitor is coupled to the third node and a second end is coupled to the second node.
  • An embodiment of the present disclosure provides a display panel including the above pixel circuit provided by an embodiment of the present disclosure.
  • An embodiment of the present disclosure provides a display device including the above display panel provided by an embodiment of the present disclosure.
  • FIG. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the present disclosure
  • FIG. 3 is a timing chart of operation of a pixel circuit according to an embodiment of the present disclosure.
  • the embodiment of the present disclosure provides a pixel circuit, as shown in FIG. 1 , which may include: a charging module 01, a driving module 02, a compensation module 03, an adjustment module 04, and a light emitting device OLED;
  • the first control terminal and the second control terminal of the charging module 01 are configured to input a first control signal S1, the third control terminal is configured to input a second control signal S2, the first input terminal is used for inputting the first power signal Vdd, and the second The input end is used for inputting the data signal Vdata, the first output end is connected to the first node P1, the second output end is connected to the second node P2, the control end of the drive module 02 is connected to the third node P3, and the input end is used for inputting a power supply signal Vdd, the output end is connected to the input end of the light emitting device OLED; the first control end of the compensation module 03 For inputting the first control signal S1, the second control end and the first input end are both connected to the first node P1, the second input end is for inputting the second power supply signal Vss, and the output end is connected to the third node P3;
  • the control terminal of 04 is used for inputting the first control signal S1, the input terminal is for inputting the reference voltage signal Vref,
  • the charging module 01 is configured to output the first power signal Vdd to the first node P1 and the data signal Vdata to the second node P2 under the control of the first control signal S1 and the second control signal S2;
  • the compensation module 03 is configured to compensate the threshold voltage of the third node P3 by the second power signal Vss under the control of the first control signal S1 and the first node P1;
  • the adjustment module 04 is used to Under the control of the first control signal S1, the potentials of the first node P1, the second node P2 and the third node P3 are adjusted by the reference voltage signal Vref; in the lighting stage, the driving module 02 is used under the control of the third node P3,
  • the light emitting device OLED is driven to emit light by the first power signal Vdd.
  • the above pixel circuit includes a charging module, a driving module, a compensation module, an adjusting module, and a light emitting device; wherein, in the charging phase, the first node and the second node may be charged by the charging module;
  • the compensation module compensates the threshold voltage of the third node; in the adjustment phase, the potential of the third node is adjusted by the adjustment module; in the illumination phase, the driving module drives the illumination device to emit light through the first power signal under the control of the third node, In this way, the function of driving the light-emitting device to emit light normally is realized; at the same time, the threshold voltage of the third node of the control driving module is compensated in the compensation phase, thereby avoiding the influence of the change of the threshold voltage of the driving module on the light-emitting brightness of the light-emitting device, and improving The uniformity of the luminance of the light-emitting device is ensured, thereby ensuring the quality of the display screen.
  • the charging module 01 may include: a first charging unit 011 and a second charging unit 012; wherein, the first charging unit 011 is first The control terminal is used for inputting the first control signal S1, the second control terminal is for inputting the second control signal S2, the input terminal is for inputting the first power supply signal Vdd, and the output terminal is connected to the first node P1; the first charging unit 011 is used The first power signal Vdd is input under the control of the first control signal S1 and the second control signal S2 Exiting to the first node P1; the control terminal of the second charging unit 012 is for inputting the first control signal S1, the input terminal is for inputting the data signal Vdata, the output terminal is connected to the second node P2; and the second charging unit 012 is for The data signal Vdata is output to the second node P2 under the control of the first control signal S1.
  • the charging module may include: a first charging unit and a second charging unit; thus, in the charging phase, charging of the first node may be implemented by using the first charging unit, The second charging unit implements charging of the second node.
  • the first charging unit 011 may include: a first switching transistor T1 and a second switching transistor T2; wherein, the first switching transistor T1 The gate is for inputting the first control signal S1, the source is for inputting the first power signal Vdd, the drain is connected to the source of the second switching transistor T2, and the gate of the second switching transistor T2 is for inputting the second control signal S2, the drain is connected to the first node P1.
  • the first switching transistor can be turned on under the control of the first control signal, and the turned-on first switching transistor can output the first power signal to the source of the second switching transistor; and the second switching transistor can be in the The second control transistor is turned on under the control of the control signal, and the turned-on second switching transistor outputs the first power signal of the source to the first node.
  • the second charging unit 012 may include: a third switching transistor T3; a gate of the third switching transistor T3 is used to input the first control Signal S1, the source is used to input the data signal Vdata, and the drain is connected to the second node P2.
  • the third switching transistor can be turned on under the control of the first control signal, and the turned-on third switching transistor can output the data signal to the second node.
  • the driving module 02 may include: a fourth switching transistor T4; the gate of the fourth switching transistor T4 is connected to the third node P3, the source The pole is used to input the first power signal Vdd, and the drain is connected to the input end of the light emitting device OLED.
  • the fourth switching transistor can be turned on under the control of the third node, and the turned-on fourth switching transistor can output the first power signal to the input end of the light emitting device, thereby driving the light emitting device to emit light.
  • the compensation module 03 can include: a fifth switching transistor T5 and a sixth switching transistor T6; wherein the gate of the fifth switching transistor T5 is connected to the first node P1, and the source is used for inputting the second power signal Vss, The pole is connected to the third node P3; the gate of the sixth switching transistor T6 is used to input the first control signal S1, the source is connected to the first node P1, and the drain is connected to the third node P3.
  • the fifth switching transistor can be turned on under the control of the first node
  • the sixth switching transistor can be turned on under the control of the first control signal
  • the fifth switching transistor and the sixth switching transistor that are turned on form a discharging circuit Further, the voltage of the third node is discharged to Vss+Vth, where Vth is the threshold voltage of the fourth switching transistor as the driving transistor.
  • the adjustment module 04 may include: a seventh switching transistor T7, a first capacitor C1, and a second capacitor C2; wherein the seventh switching transistor The gate of T7 is used for inputting the first control signal S1, the source is for inputting the reference voltage signal Vref, and the drain is respectively connected with one end of the first capacitor C1 and the second node P2; the other end of the first capacitor C1 is first The node P1 is connected; the second capacitor C2 is connected between the second node P2 and the third node P3.
  • the seventh switching transistor can be turned on under the control of the first control signal, and the turned-on seventh switching transistor can output the reference voltage signal to one end of the first capacitor and the second node, thereby passing the first capacitor and the first
  • the coupling of the two capacitors adjusts the potential of the first node and the third node.
  • the switching transistor and the driving transistor mentioned in the embodiments of the present disclosure may be a thin film transistor (TFT) or a metal oxide semiconductor field effect transistor (MOS, Metal Oxide Semiconductor). Make a limit.
  • TFT thin film transistor
  • MOS metal oxide semiconductor field effect transistor
  • the sources and drains of these transistors can be interchanged without specific distinction.
  • a thin film transistor will be described as an example in describing a specific embodiment.
  • a high level signal is indicated by 1 and a low level signal is indicated by 0, and the first to sixth switching transistors are N-type transistors, and the seventh switching transistor is a P-type transistor as an example.
  • the turned-on third switching transistor T3 maintains the point of the second node P2 as Vdata; the first node P1 maintains the potential Vdd of the previous stage, thus
  • the fifth switching transistor T5 is turned on, and the fifth switching transistor T5 and the sixth switching transistor T6 that are turned on form a discharging circuit, and then discharge the voltage of the third node P3 to Vss+Vth, wherein Vth is the driving transistor.
  • the EVss remain at a high level, and the light emitting device OLED does not emit light.
  • the driving current for driving the light-emitting device 04 to emit light is independent of the threshold voltage of the fourth switching transistor T4, thereby eliminating the influence of the variation of the threshold voltage of the fourth switching transistor T4 on the luminance of the light-emitting device OLED, and improving the light-emitting device.
  • the uniformity of the luminance of the OLED is independent of the threshold voltage of the fourth switching transistor T4, thereby eliminating the influence of the variation of the threshold voltage of the fourth switching transistor T4 on the luminance of the light-emitting device OLED, and improving the light-emitting device.
  • an embodiment of the present disclosure provides a driving method of the foregoing pixel circuit according to an embodiment of the present disclosure, which may include:
  • the charging module In the charging phase, the charging module outputs the first power signal to the first node under the control of the first control signal and the second control signal, and outputs the data signal to the second node;
  • the compensation module compensates the third node for the threshold voltage by the second power signal under the control of the second control signal and the first node;
  • the adjustment module adjusts the potentials of the first node, the second node, and the third node by using the reference voltage signal under the control of the second control signal;
  • the driving module drives the illuminating device to emit light through the first power signal under the control of the third node.
  • the first node and the second node may be charged; in the compensation phase, the threshold voltage of the third node may be compensated; in the adjustment phase, Realizing the potential adjustment of the third node; in the illuminating phase, the illuminating device can be driven to emit light by the first power signal, thus realizing the normal illuminating function of the illuminating device; meanwhile, the third node of the control driving module is performed in the compensation phase.
  • the compensation of the threshold voltage avoids the influence of the variation of the threshold voltage of the driving module on the luminance of the light emitting device, and improves the uniformity of the luminance of the light emitting device, thereby ensuring the quality of the display screen.
  • an embodiment of the present disclosure provides a display panel including the above pixel circuit provided by an embodiment of the present disclosure.
  • the display panel can be: mobile phone, tablet, Any product or component that has a display function, such as a television, monitor, laptop, digital photo frame, navigator, etc. Since the principle of solving the problem of the display panel is similar to that of the pixel circuit, the implementation of the display panel can be referred to the implementation of the pixel circuit, and the repeated description is omitted.
  • an embodiment of the present disclosure provides a display device, including the above display panel provided by an embodiment of the present disclosure. Since the principle of solving the problem of the display device is similar to that of the display panel, the implementation of the display device can be referred to the implementation of the display panel, and the repeated description is omitted.
  • the embodiment of the present disclosure provides a pixel circuit, a driving method thereof, a display panel, and a display device.
  • the pixel circuit includes: a charging module, a driving module, a compensation module, an adjustment module, and a light emitting device; wherein, the first control end of the charging module And a second control terminal for inputting a first control signal, a third control terminal for inputting a second control signal, a first input terminal for inputting a first power signal, and a second input terminal for inputting a data signal, the first output
  • the terminal is connected to the first node, the second output terminal is connected to the second node;
  • the control end of the driving module is connected to the third node, the input end is used for inputting the first power signal, and the output end is connected with the input end of the light emitting device;
  • the compensation module The first control end is configured to input a first control signal, the second control end and the first input end are both connected to the first node, the second input end is used for inputting the
  • the above pixel circuit includes a charging module, a driving module, a compensation module, an adjusting module, and a light emitting device; wherein, in the charging phase, the first node and the second node may be charged by the charging module;
  • the compensation module compensates the threshold voltage of the third node; in the adjustment phase, the potential of the third node is adjusted by the adjustment module; in the illumination phase, the driving module drives the illumination device to emit light through the first power signal under the control of the third node, In this way, the function of driving the light-emitting device to emit light normally is realized; at the same time, the threshold voltage of the third node of the control driving module is compensated in the compensation phase, thereby avoiding the influence of the change of the threshold voltage of the driving module on the light-emitting brightness of the light-emitting device, and improving The uniformity of the luminance of the light-emitting device is ensured, thereby ensuring the quality of the display screen.
  • the embodiment of the present disclosure provides a pixel circuit, a driving method thereof, a display panel, and a display device.
  • the pixel circuit includes: a charging module, a driving module, a compensation module, an adjustment module, and a light emitting device; wherein, the first control end of the charging module And a second control terminal for inputting a first control signal, a third control terminal for inputting a second control signal, a first input terminal for inputting a first power signal, and a second input terminal for inputting a data signal, the first output
  • the terminal is connected to the first node, the second output terminal is connected to the second node;
  • the control end of the driving module is connected to the third node, the input end is used for inputting the first power signal, and the output end is connected with the input end of the light emitting device;
  • the compensation module The first control end is configured to input a first control signal, the second control end and the first input end are both connected to the first node, the second input end is used for inputting the
  • the above pixel circuit includes a charging module, a driving module, a compensation module, an adjusting module, and a light emitting device; wherein, in the charging phase, the first node and the second node may be charged by the charging module;
  • the compensation module compensates the threshold voltage of the third node; in the adjustment phase, the potential of the third node is adjusted by the adjustment module; in the illumination phase, the driving module drives the illumination device to emit light through the first power signal under the control of the third node, In this way, the function of driving the light-emitting device to emit light normally is realized; at the same time, the threshold voltage of the third node of the control driving module is compensated in the compensation phase, thereby avoiding the influence of the change of the threshold voltage of the driving module on the light-emitting brightness of the light-emitting device, and improving The uniformity of the luminance of the light-emitting device is ensured, thereby ensuring the quality of the display screen.

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Abstract

一种像素电路、其驱动方法、显示面板及显示装置，该像素电路包括：充电模块(01)、驱动模块(02)、补偿模块(03)、调整模块(04)和发光器件(OLED)；其中，在充电阶段，可以通过充电模块(01)对第一节点(P1)和第二节点(P2)充电；在补偿阶段，通过补偿模块(03)对第三节点(P3)进行阈值电压的补偿；在调整阶段，通过调整模块(04)调整第三节点(P3)的电位；在发光阶段，驱动模块(02)在第三节点(P3)的控制下，通过第一电源信号(Vdd)驱动发光器件(OLED)发光，这样实现了驱动发光器件(OLED)正常发光的功能；同时，在补偿阶段对控制驱动模块(02)的第三节点(P3)进行了阈值电压的补偿，避免了驱动模块(02)的阈值电压的变化对发光器件(OLED)的发光亮度的影响，提高了发光器件(OLED)发光亮度的均一性，从而保证了显示画面的质量。

Description

一种像素电路、其驱动方法、显示面板及显示装置 技术领域
本公开涉及显示技术领域，尤其涉及一种像素电路、其驱动方法及显示面板及显示装置。
背景技术
随着显示技术的进步，越来越多的有源矩阵有机发光二极管(Active Matrix Organic Light Emitting Diode，AMOLED)显示面板进入市场，与传统的晶体管液晶显示面板(Thin Film Transistor Liquid Crystal Display,TFT LCD)相比，具有低能耗、生产成本低、自发光、宽视角及响应速度快等优点，目前，在手机、PDA、数码相机等显示领域已经开始逐步取代传统的LCD显示屏。与TFT LCD利用稳定的电压控制亮度不同，AMOLED需要稳定的电流来控制发光。
现有的驱动OLED发光的像素电路中，驱动晶体管驱动发光器件OLED发光时，由于OLED的发光亮度对其驱动电流的变化相当敏感，且驱动晶体管在制作过程中无法做到完全一致，而且由于工艺制程偏差和器件的老化，以及工作过程中温度的变化等原因，会使各像素电路中的驱动晶体管的阈值电压Vth存在不均匀性，这样就导致了流过每个像素点的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。
因此，如何消除像素电路中驱动晶体管阈值电压的变化对发光器件的发光亮度的影响，提高显示面板的显示亮度均一性，从而提高显示面板的显示效果，是本领域技术人员亟待解决的技术问题。
发明内容
本公开实施例提供了一种像素电路、其驱动方法、显示面板及显示装置。
本公开实施例提供了一种像素电路，包括：充电模块、驱动模块、补偿模块、调整模块和发光器件；其中，
所述充电模块的第一控制端和第二控制端用于输入第一控制信号，第三控制端用于输入第二控制信号，第一输入端用于输入第一电源信号，第二输入端用于输入数据信号，第一输出端与第一节点相连，第二输出端与第二节点相连；
所述驱动模块的控制端与第三节点相连，输入端用于输入所述第一电源信号，输出端与所述发光器件的输入端相连；
所述补偿模块的第一控制端用于输入所述第一控制信号，第二控制端和第一输入端均与所述第一节点相连，第二输入端用于输入第二电源信号，输出端与所述第三节点相连；
所述调整模块的控制端用于输入所述第一控制信号，输入端用于输入参考电压信号，第一输出端与所述第一节点相连，第二输出端与所述第二节点相连，第三输出端与所述第三节点相连；
所述发光器件的输出端用于接入第三电源信号；
在充电阶段，所述充电模块用于在所述第一控制信号和所述第二控制信号的控制下，将所述第一电源信号输出到所述第一节点，将所述数据信号输出到所述第二节点；在补偿阶段，所述补偿模块用于在所述第一控制信号和所述第一节点的控制下，通过所述第二电源信号对所述第三节点进行阈值电压的补偿；在调整阶段，所述调整模块用于在所述第一控制信号的控制下，通过所述参考电压信号调整所述第一节点、所述第二节点和所述第三节点的电位；在发光阶段，所述驱动模块用于在所述第三节点的控制下，通过所述第一电源信号驱动所述发光器件发光。
在一种可能的实施方式中，本公开实施例提供的上述像素电路中，所述充电模块，包括：第一充电单元和第二充电单元；其中，
所述第一充电单元的第一控制端用于输入所述第一控制信号，第二控制端用于输入所述第二控制信号，输入端用于输入所述第一电源信号，输出端与所述第一节点相连；所述第一充电单元用于在所述第一控制信号和所述第二控制信号的控制下，将所述第一电源信号输出到所述第一节点；
所述第二充电单元的控制端用于输入所述第一控制信号，输入 端用于输入所述数据信号，输出端与所述第二节点相连；所述第二充电单元用于在所述第一控制信号的控制下，将所述数据信号输出到所述第二节点。
在一种可能的实施方式中，本公开实施例提供的上述像素电路中，所述第一充电单元，包括：第一开关晶体管和第二开关晶体管；其中，
所述第一开关晶体管的栅极用于输入所述第一控制信号，源极用于输入所述第一电源信号，漏极与所述第二开关晶体管的源极相连；
所述第二开关晶体管的栅极用于输入所述第二控制信号，漏极与所述第一节点相连。
在一种可能的实施方式中，本公开实施例提供的上述像素电路中，所述第二充电单元，包括：第三开关晶体管；
所述第三开关晶体管的栅极用于输入所述第一控制信号，源极用于输入所述数据信号，漏极与所述第二节点相连。
在一种可能的实施方式中，本公开实施例提供的上述像素电路中，所述驱动模块，包括：第四开关晶体管；
所述第四开关晶体管的栅极与所述第三节点相连，源极用于输入所述第一电源信号，漏极与所述发光器件的输入端相连。
在一种可能的实施方式中，本公开实施例提供的上述像素电路中，所述补偿模块，包括：第五开关晶体管和第六开关晶体管；其中，
所述第五开关晶体管的栅极与所述第一节点相连，源极用于输入所述第二电源信号，漏极与所述第三节点相连；
所述第六开关晶体管的栅极用于输入所述第一控制信号，源极与所述第一节点相连，漏极与所述第三节点相连。
在一种可能的实施方式中，本公开实施例提供的上述像素电路中，所述调整模块，包括：第七开关晶体管、第一电容和第二电容；其中，
所述第七开关晶体管的栅极用于输入所述第一控制信号，源极用于输入所述参考电压信号，漏极分别与所述第一电容的一端和所述 第二节点相连；
所述第一电容的另一端与所述第一节点相连；
所述第二电容连接于所述第二节点和所述第三节点之间。
本公开实施例提供了一种本公开实施例提供的上述像素电路的驱动方法，包括：
在充电阶段，所述充电模块在所述第一控制信号和所述第二控制信号的控制下，将所述第一电源信号输出到所述第一节点，将所述数据信号输出到所述第二节点；
在补偿阶段，所述补偿模块在所述第一控制信号和所述第一节点的控制下，通过所述第二电源信号对所述第三节点进行阈值电压的补偿；
在调整阶段，所述调整模块在所述第一控制信号的控制下，通过所述参考电压信号调整所述第一节点、所述第二节点和所述第三节点的电位；
在发光阶段，所述驱动模块在所述第三节点的控制下，通过所述第一电源信号驱动所述发光器件发光。
本公开实施例提供了一种像素电路，包括：充电模块，响应于第一控制信号和第二控制信号将数据信号输出至第一节点和第三节点；驱动模块，响应于所述第三节点的信号电平，利用第一电源信号输出驱动电压；补偿模块，响应于所述第一控制信号和所述第一节点的电位，利用第二电源信号对所述第三节点进行阈值电压的补偿；以及发光器件，在所述驱动电压的驱动下发光。
在一种可能的实施方式中，本公开实施例提供的上述像素电路，还包括：调整模块，响应于所述第一控制信号，利用参考电压来调整所述第一节点和所述第三节点的电位。
在一种可能的实施方式中，本公开实施例提供的上述像素电路中，所述补偿模块包括：第五开关晶体管，所述第五开关晶体管的栅极与所述第一节点相连，源极用于输入所述第二电源信号，漏极与所述第三节点相连；以及第六开关晶体管；其中，所述第六开关晶体管的栅极用于输入所述第一控制信号，源极与所述第一节点相连，漏极 与所述第三节点相连。
在一种可能的实施方式中，本公开实施例提供的上述像素电路中，所述调整模块包括：第七开关晶体管、第一电容和第二电容，所述第一电容的第一端连接到所述第一节点，第二端连接到所述第七开关晶体管的漏极，所述第七开关晶体管的栅极用于输入所述第一控制信号，源极用于输入所述参考电压信号，漏极连接到所述第一电容的第二端以及第二节点，以及所述第二电容的第一端连接到所述第三节点，第二端连接到所述第二节点。
本公开实施例提供了一种显示面板，包括本公开实施例提供的上述像素电路。
本公开实施例提供了一种显示装置，包括本公开实施例提供的上述显示面板。
附图说明
图1为本公开实施例提供的像素电路的结构示意图；
图2为本公开实施例提供的像素电路的具体结构示意图；
图3为本公开实施例提供的像素电路的工作时序图。
具体实施方式
下面结合附图，对本公开实施例提供的像素电路、其驱动方法、显示面板及显示装置的具体实施方式进行详细的说明。
本公开实施例提供了一种像素电路，如图1所示，可以包括：充电模块01、驱动模块02、补偿模块03、调整模块04和发光器件OLED；其中，
充电模块01的第一控制端和第二控制端用于输入第一控制信号S1，第三控制端用于输入第二控制信号S2，第一输入端用于输入第一电源信号Vdd，第二输入端用于输入数据信号Vdata，第一输出端与第一节点P1相连，第二输出端与第二节点P2相连；驱动模块02的控制端与第三节点P3相连，输入端用于输入第一电源信号Vdd，输出端与发光器件OLED的输入端相连；补偿模块03的第一控制端 用于输入第一控制信号S1，第二控制端和第一输入端均与第一节点P1相连，第二输入端用于输入第二电源信号Vss，输出端与第三节点P3相连；调整模块04的控制端用于输入第一控制信号S1，输入端用于输入参考电压信号Vref，第一输出端与第一节点P1相连，第二输出端与第二节点P2相连，第三输出端与第三节点P3相连；发光器件OLED的输出端用于接入第三电源信号EVss；
在充电阶段，充电模块01用于在第一控制信号S1和第二控制信号S2的控制下，将第一电源信号Vdd输出到第一节点P1，将数据信号Vdata输出到第二节点P2；在补偿阶段，补偿模块03用于在第一控制信号S1和第一节点P1的控制下，通过第二电源信号Vss对第三节点P3进行阈值电压的补偿；在调整阶段，调整模块04用于在第一控制信号S1的控制下，通过参考电压信号Vref调整第一节点P1、第二节点P2和第三节点P3的电位；在发光阶段，驱动模块02用于在第三节点P3的控制下，通过第一电源信号Vdd驱动发光器件OLED发光。
本公开实施例提供的上述像素电路包括充电模块、驱动模块、补偿模块、调整模块和发光器件；其中，在充电阶段，可以通过充电模块对第一节点和第二节点充电；在补偿阶段，通过补偿模块对第三节点进行阈值电压的补偿；在调整阶段，通过调整模块调整第三节点的电位；在发光阶段，驱动模块在第三节点的控制下，通过第一电源信号驱动发光器件发光，这样实现了驱动发光器件正常发光的功能；同时，在补偿阶段对控制驱动模块的第三节点进行了阈值电压的补偿，避免了驱动模块的阈值电压的变化对发光器件的发光亮度的影响，提高了发光器件发光亮度的均一性，从而保证了显示画面的质量。
在具体实施时，本公开实施例提供的上述像素电路中，如图2所示，充电模块01可以包括：第一充电单元011和第二充电单元012；其中，第一充电单元011的第一控制端用于输入第一控制信号S1，第二控制端用于输入第二控制信号S2，输入端用于输入第一电源信号Vdd，输出端与第一节点P1相连；第一充电单元011用于在第一控制信号S1和第二控制信号S2的控制下，将第一电源信号Vdd输 出到第一节点P1；第二充电单元012的控制端用于输入第一控制信号S1，输入端用于输入数据信号Vdata，输出端与第二节点P2相连；第二充电单元012用于在第一控制信号S1的控制下，将数据信号Vdata输出到第二节点P2。具体地，本公开实施例提供的上述像素电路中，充电模块可以包括：第一充电单元和第二充电单元；这样在充电阶段，可以通过第一充电单元实现对第一节点的充电，通过第二充电单元实现对第二节点的充电。
在具体实施时，本公开实施例提供的上述像素电路中，如图2所示，第一充电单元011可以包括：第一开关晶体管T1和第二开关晶体管T2；其中，第一开关晶体管T1的栅极用于输入第一控制信号S1，源极用于输入第一电源信号Vdd，漏极与第二开关晶体管T2的源极相连；第二开关晶体管T2的栅极用于输入第二控制信号S2，漏极与第一节点P1相连。具体地，第一开关晶体管可以在第一控制信号的控制下导通，导通的第一开关晶体管可以将第一电源信号输出到第二开关晶体管的源极；进而第二开关晶体管可以在第二控制信号的控制下导通，导通的第二开关晶体管将源极的第一电源信号输出到第一节点。
在具体实施时，本公开实施例提供的上述像素电路中，如图2所示，第二充电单元012可以包括：第三开关晶体管T3；第三开关晶体管T3的栅极用于输入第一控制信号S1，源极用于输入数据信号Vdata，漏极与第二节点P2相连。具体地，第三开关晶体管可以在第一控制信号的控制下导通，导通的第三开关晶体管可以将数据信号输出到第二节点。
在具体实施时，本公开实施例提供的上述像素电路中，如图2所示，驱动模块02可以包括：第四开关晶体管T4；第四开关晶体管T4的栅极与第三节点P3相连，源极用于输入第一电源信号Vdd，漏极与发光器件OLED的输入端相连。具体地，第四开关晶体管可以在第三节点的控制下导通，导通的第四开关晶体管可以将第一电源信号输出到发光器件的输入端，进而驱动发光器件发光。
在具体实施时，本公开实施例提供的上述像素电路中，如图2 所示，补偿模块03可以包括：第五开关晶体管T5和第六开关晶体管T6；其中，第五开关晶体管T5的栅极与第一节点P1相连，源极用于输入第二电源信号Vss，漏极与第三节点P3相连；第六开关晶体管T6的栅极用于输入第一控制信号S1，源极与第一节点P1相连，漏极与第三节点P3相连。具体地，第五开关晶体管可以在第一节点的控制下导通，第六开关晶体管可以在第一控制信号的控制下导通，导通的第五开关晶体管和第六开关晶体管形成一个放电回路，进而将第三节点的电压放电至Vss+Vth为止，其中，Vth为作为驱动晶体管的第四开关晶体管的阈值电压。
在具体实施时，本公开实施例提供的上述像素电路中，如图2所示，调整模块04可以包括：第七开关晶体管T7、第一电容C1和第二电容C2；其中，第七开关晶体管T7的栅极用于输入第一控制信号S1，源极用于输入参考电压信号Vref，漏极分别与第一电容C1的一端和第二节点P2相连；第一电容C1的另一端与第一节点P1相连；第二电容C2连接于第二节点P2和第三节点P3之间。具体地，第七开关晶体管可以在第一控制信号的控制下导通，导通的第七开关晶体管可以将参考电压信号输出到第一电容的一端和第二节点，进而通过第一电容和第二电容的耦合作用调整第一节点的和第三节点的电位。
需要说明的是本公开实施例中提到的开关晶体管和驱动晶体管可以是薄膜晶体管(TFT，Thin Film Transistor)，也可以是金属氧化物半导体场效应管(MOS，Metal Oxide Semiconductor)，在此不做限定。在具体实施中，这些晶体管的源极和漏极可以互换，不做具体区分。在描述具体实施例时以薄膜晶体管为例进行说明。
下面结合图2所示的像素电路以及图3所示的图2的输入输出时序图，对本公开实施例提供的像素电路的工作过程作以描述。具体地，选取如图3所示的输入输出时序图中的t1～t4四个阶段。下述描述中以1表示高电平信号，0表示低电平信号，且第一～第六开关晶体管为N型晶体管，第七开关晶体管为P型晶体管为例进行说明。
在t1阶段，S1＝1，S2＝1，EVss＝1，Vdd＝1，Vss＝0。由于S1 ＝1，S2＝1，因此，第一开关晶体管T1、第二开关晶体管T2、第三开关晶体管T3和第六开关晶体管T6导通；其中，导通的第一开关晶体管T1和第二开关晶体管T2将第一电源信号Vdd输出到第一节点P1，因此第一节点P1的电位V1＝Vdd；导通的第三开关晶体管T3将数据信号Vdata输出到第二节点P2，因此第二节点P2的电位V2＝Vdata；导通的第六开关晶体管T6将第一节点P1与第三节点P3导通，因此第三节点P3的电位V3＝Vdd，由于该阶段EVss＝1，因此第四开关晶体管T4导通后，发光器件OLED两端均为高电平而被短接不发光。
在t2阶段，S1＝1，S2＝0，EVss＝1，Vdd＝1，Vss＝0。由于S1＝1，因此，第一开关晶体管T1、第三开关晶体管T3和第六开关晶体管T6保持导通状态；由于S2＝0，因此第二开关晶体管T2截止，导通第一开关晶体管T1的仅将第一电源信号Vdd输出到第二开关晶体管T2的源极；导通的第三开关晶体管T3保持第二节点P2的点为Vdata；第一节点P1保持上一阶段的电位Vdd，因此第五开关晶体管T5导通，导通的第五开关晶体管T5和第六开关晶体管T6形成一个放电回路，进而将第三节点P3的电压放电至Vss+Vth为止，其中，Vth为作为驱动晶体管的第四开关晶体管T4的阈值电压；该阶段第二电容C2两端的电压差为V3-V2＝Vss+Vth-Vdata。另外，该阶段EVss保持高电平，发光器件OLED不发光。
在t3阶段，S1＝0，S2＝0，EVss＝1，Vdd＝1，Vss＝0。由于S1＝0，因此第七开关晶体管T7导通，导通的第七开关晶体管T7将参考电压信号Vref分别输出到第一电容C1的一端和第二节点P2；由于第二电容C2的耦合作用，该阶段第三节点P3的电位V3＝Vss+Vth-Vdata+Vref。另外，该阶段EVss保持高电平，发光器件OLED不发光。
在t4阶段，S1＝0，S2＝0，EVss＝0，Vdd＝1，Vss＝0。该阶段EVss＝0，第四开关晶体管T3在第三节点P3的控制下进入饱和开启状态，通过第一电源信号Vdd驱动发光器件OLED发光。由上一阶段可知，作为驱动晶体管的第四开关晶体管T4的栅极电压为即第三节点的电 压V3＝Vss+Vth-Vdata+Vref，因此驱动发光器件OLED发光的驱动电流为：I＝(W/2L)μnCox(Vgs-Vth)2＝(W/2L)μnCox(Vss+Vth-Vdata+Vref-Vdd-Vth)2＝(W/2L)μnCox(Vss-Vdata+Vref-Vdd)2，其中，Vgs为第四开关晶体管T4的栅极与源极之间的电压差，un为第四开关晶体管T4的迁移率，Cox为第四开关晶体管T4的本征电容，W/L为第四开关晶体管T4的宽长比。由此可知，驱动发光器件04发光的驱动电流与第四开关晶体管T4的阈值电压无关，从而消除了第四开关晶体管T4的阈值电压的变化对发光器件OLED的发光亮度的影响，提高了发光器件OLED的发光亮度的均一性。
基于同一构思，本公开实施例提供了一种本公开实施例提供的上述像素电路的驱动方法，可以包括：
在充电阶段，充电模块在第一控制信号和第二控制信号的控制下，将第一电源信号输出到第一节点，将数据信号输出到第二节点；
在补偿阶段，补偿模块在第二控制信号和第一节点的控制下，通过第二电源信号对第三节点进行阈值电压的补偿；
在调整阶段，调整模块在第二控制信号的控制下，通过参考电压信号调整第一节点、第二节点和第三节点的电位；
在发光阶段，驱动模块在第三节点的控制下，通过第一电源信号驱动发光器件发光。
本公开实施例提供的上述像素电路的驱动方法，在充电阶段，可以实现对第一节点和第二节点充电；在补偿阶段，可以实现对第三节点进行阈值电压的补偿；在调整阶段，可以实现对第三节点的电位调整；在发光阶段，可以实现通过第一电源信号驱动发光器件发光，这样实现了发光器件的正常发光功能；同时，在补偿阶段对控制驱动模块的第三节点进行了阈值电压的补偿，避免了驱动模块的阈值电压的变化对发光器件的发光亮度的影响，提高了发光器件发光亮度的均一性，从而保证了显示画面的质量。
基于同一构思，本公开实施例提供了一种显示面板，包括本公开实施例提供的上述像素电路。该显示面板可以为：手机、平板电脑、 电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。由于该显示面板解决问题的原理与像素电路相似，因此该显示面板的实施可以参见像素电路的实施，重复之处不再赘述。
基于同一构思，本公开实施例提供了一种显示装置，包括本公开实施例提供的上述显示面板。由于该显示装置解决问题的原理与显示面板相似，因此该显示装置的实施可以参见显示面板的实施，重复之处不再赘述。
本公开实施例提供了一种像素电路、其驱动方法、显示面板及显示装置，该像素电路包括：充电模块、驱动模块、补偿模块、调整模块和发光器件；其中，充电模块的第一控制端和第二控制端用于输入第一控制信号，第三控制端用于输入第二控制信号，第一输入端用于输入第一电源信号，第二输入端用于输入数据信号，第一输出端与第一节点相连，第二输出端与第二节点相连；驱动模块的控制端与第三节点相连，输入端用于输入第一电源信号，输出端与发光器件的输入端相连；补偿模块的第一控制端用于输入第一控制信号，第二控制端和第一输入端均与第一节点相连，第二输入端用于输入第二电源信号，输出端与第三节点相连；调整模块的控制端用于输入第一控制信号，输入端用于输入参考电压信号，第一输出端与第一节点相连，第二输出端与第二节点相连，第三输出端与第三节点相连；发光器件的输出端用于接入第三电源信号；
本公开实施例提供的上述像素电路包括充电模块、驱动模块、补偿模块、调整模块和发光器件；其中，在充电阶段，可以通过充电模块对第一节点和第二节点充电；在补偿阶段，通过补偿模块对第三节点进行阈值电压的补偿；在调整阶段，通过调整模块调整第三节点的电位；在发光阶段，驱动模块在第三节点的控制下，通过第一电源信号驱动发光器件发光，这样实现了驱动发光器件正常发光的功能；同时，在补偿阶段对控制驱动模块的第三节点进行了阈值电压的补偿，避免了驱动模块的阈值电压的变化对发光器件的发光亮度的影响，提高了发光器件发光亮度的均一性，从而保证了显示画面的质量。
本公开实施例的有益效果包括：
本公开实施例提供了一种像素电路、其驱动方法、显示面板及显示装置，该像素电路包括：充电模块、驱动模块、补偿模块、调整模块和发光器件；其中，充电模块的第一控制端和第二控制端用于输入第一控制信号，第三控制端用于输入第二控制信号，第一输入端用于输入第一电源信号，第二输入端用于输入数据信号，第一输出端与第一节点相连，第二输出端与第二节点相连；驱动模块的控制端与第三节点相连，输入端用于输入第一电源信号，输出端与发光器件的输入端相连；补偿模块的第一控制端用于输入第一控制信号，第二控制端和第一输入端均与第一节点相连，第二输入端用于输入第二电源信号，输出端与第三节点相连；调整模块的控制端用于输入第一控制信号，输入端用于输入参考电压信号，第一输出端与第一节点相连，第二输出端与第二节点相连，第三输出端与第三节点相连；发光器件的输出端用于接入第三电源信号；
本公开实施例提供的上述像素电路包括充电模块、驱动模块、补偿模块、调整模块和发光器件；其中，在充电阶段，可以通过充电模块对第一节点和第二节点充电；在补偿阶段，通过补偿模块对第三节点进行阈值电压的补偿；在调整阶段，通过调整模块调整第三节点的电位；在发光阶段，驱动模块在第三节点的控制下，通过第一电源信号驱动发光器件发光，这样实现了驱动发光器件正常发光的功能；同时，在补偿阶段对控制驱动模块的第三节点进行了阈值电压的补偿，避免了驱动模块的阈值电压的变化对发光器件的发光亮度的影响，提高了发光器件发光亮度的均一性，从而保证了显示画面的质量。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (16)

  1. 一种像素电路，包括：充电模块、驱动模块、补偿模块、调整模块和发光器件；其中，
    所述充电模块的第一控制端和第二控制端用于输入第一控制信号，第三控制端用于输入第二控制信号，第一输入端用于输入第一电源信号，第二输入端用于输入数据信号，第一输出端与第一节点相连，第二输出端与第二节点相连；
    所述驱动模块的控制端与第三节点相连，输入端用于输入所述第一电源信号，输出端与所述发光器件的输入端相连；
    所述补偿模块的第一控制端用于输入所述第一控制信号，第二控制端和第一输入端均与所述第一节点相连，第二输入端用于输入第二电源信号，输出端与所述第三节点相连；
    所述调整模块的控制端用于输入所述第一控制信号，输入端用于输入参考电压信号，第一输出端与所述第一节点相连，第二输出端与所述第二节点相连，第三输出端与所述第三节点相连；
    所述发光器件的输出端用于接入第三电源信号；
    在充电阶段，所述充电模块用于在所述第一控制信号和所述第二控制信号的控制下，将所述第一电源信号输出到所述第一节点，将所述数据信号输出到所述第二节点；在补偿阶段，所述补偿模块用于在所述第一控制信号和所述第一节点的控制下，通过所述第二电源信号对所述第三节点进行阈值电压的补偿；在调整阶段，所述调整模块用于在所述第一控制信号的控制下，通过所述参考电压信号调整所述第一节点、所述第二节点和所述第三节点的电位；在发光阶段，所述驱动模块用于在所述第三节点的控制下，通过所述第一电源信号驱动所述发光器件发光。
  2. 如权利要求1所述的像素电路，其中，所述充电模块，包括：第一充电单元和第二充电单元；其中，
    所述第一充电单元的第一控制端用于输入所述第一控制信号，第二控制端用于输入所述第二控制信号，输入端用于输入所述第一电源信号，输出端与所述第一节点相连；所述第一充电单元用于在所述 第一控制信号和所述第二控制信号的控制下，将所述第一电源信号输出到所述第一节点；
    所述第二充电单元的控制端用于输入所述第一控制信号，输入端用于输入所述数据信号，输出端与所述第二节点相连；所述第二充电单元用于在所述第一控制信号的控制下，将所述数据信号输出到所述第二节点。
  3. 如权利要求2所述的像素电路，其中，所述第一充电单元，包括：第一开关晶体管和第二开关晶体管；其中，
    所述第一开关晶体管的栅极用于输入所述第一控制信号，源极用于输入所述第一电源信号，漏极与所述第二开关晶体管的源极相连；
    所述第二开关晶体管的栅极用于输入所述第二控制信号，漏极与所述第一节点相连。
  4. 如权利要求2所述的像素电路，其中，所述第二充电单元，包括：第三开关晶体管；
    所述第三开关晶体管的栅极用于输入所述第一控制信号，源极用于输入所述数据信号，漏极与所述第二节点相连。
  5. 如权利要求1-4任一项所述的像素电路，其中，所述驱动模块，包括：第四开关晶体管；
    所述第四开关晶体管的栅极与所述第三节点相连，源极用于输入所述第一电源信号，漏极与所述发光器件的输入端相连。
  6. 如权利要求1-4任一项所述的像素电路，其中，所述补偿模块，包括：第五开关晶体管和第六开关晶体管；其中，
    所述第五开关晶体管的栅极与所述第一节点相连，源极用于输入所述第二电源信号，漏极与所述第三节点相连；
    所述第六开关晶体管的栅极用于输入所述第一控制信号，源极与所述第一节点相连，漏极与所述第三节点相连。
  7. 如权利要求1-4任一项所述的像素电路，其中，所述调整模块，包括：第七开关晶体管、第一电容和第二电容；其中，
    所述第七开关晶体管的栅极用于输入所述第一控制信号，源极 用于输入所述参考电压信号，漏极分别与所述第一电容的一端和所述第二节点相连；
    所述第一电容的另一端与所述第一节点相连；
    所述第二电容连接于所述第二节点和所述第三节点之间。
  8. 一种如权利要求1-7任一项所述的像素电路的驱动方法，包括：
    在充电阶段，所述充电模块在所述第一控制信号和所述第二控制信号的控制下，将所述第一电源信号输出到所述第一节点，将所述数据信号输出到所述第二节点；
    在补偿阶段，所述补偿模块在所述第一控制信号和所述第一节点的控制下，通过所述第二电源信号对所述第三节点进行阈值电压的补偿；
    在调整阶段，所述调整模块在所述第一控制信号的控制下，通过所述参考电压信号调整所述第一节点、所述第二节点和所述第三节点的电位；
    在发光阶段，所述驱动模块在所述第三节点的控制下，通过所述第一电源信号驱动所述发光器件发光。
  9. 一种显示面板，包括如权利要求1-7任一项所述的像素电路。
  10. 一种显示装置，包括如权利要求9所述的显示面板。
  11. 一种像素电路，包括：
    充电模块，响应于第一控制信号和第二控制信号将数据信号输出至第一节点和第三节点；
    驱动模块，响应于所述第三节点的信号电平，利用第一电源信号输出驱动电压；
    补偿模块，响应于所述第一控制信号和所述第一节点的电位，利用第二电源信号对所述第三节点进行阈值电压的补偿；以及
    发光器件，在所述驱动电压的驱动下发光。
  12. 根据权利要求11所述的像素电路，还包括：
    调整模块，响应于所述第一控制信号，利用参考电压来调整所述第一节点和所述第三节点的电位。
  13. 根据权利要求11所述的像素电路，其中，所述补偿模块包括：
    第五开关晶体管，所述第五开关晶体管的栅极与所述第一节点相连，源极用于输入所述第二电源信号，漏极与所述第三节点相连；以及
    第六开关晶体管；其中，所述第六开关晶体管的栅极用于输入所述第一控制信号，源极与所述第一节点相连，漏极与所述第三节点相连。
  14. 根据权利要求12所述的像素电路，其中，所述调整模块包括：第七开关晶体管、第一电容和第二电容，
    所述第一电容的第一端连接到所述第一节点，第二端连接到所述第七开关晶体管的漏极，
    所述第七开关晶体管的栅极用于输入所述第一控制信号，源极用于输入所述参考电压信号，漏极连接到所述第一电容的第二端以及第二节点，以及
    所述第二电容的第一端连接到所述第三节点，第二端连接到所述第二节点。
  15. 一种显示面板，包括如权利要求11-14任一项所述的像素电路。
  16. 一种显示装置，包括如权利要求15所述的显示面板。
PCT/CN2017/090802 2016-12-27 2017-06-29 一种像素电路、其驱动方法、显示面板及显示装置 WO2018120701A1 (zh)

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