WO2020113674A1 - 像素驱动电路及显示装置 - Google Patents

像素驱动电路及显示装置 Download PDF

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Publication number
WO2020113674A1
WO2020113674A1 PCT/CN2018/121848 CN2018121848W WO2020113674A1 WO 2020113674 A1 WO2020113674 A1 WO 2020113674A1 CN 2018121848 W CN2018121848 W CN 2018121848W WO 2020113674 A1 WO2020113674 A1 WO 2020113674A1
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Prior art keywords
thin film
node
film transistor
signal
voltage
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PCT/CN2018/121848
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English (en)
French (fr)
Inventor
李新吉
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Publication of WO2020113674A1 publication Critical patent/WO2020113674A1/zh
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Classifications

    • 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]
    • G09G3/3266—Details of drivers for scan 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
    • 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
    • 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

Definitions

  • the present invention relates to the field of display technology, and in particular, to a pixel driving circuit and a display device.
  • Organic light emitting diode (Organic Light Emitting Display, OLED) display device has self-luminous, low driving voltage, high luminous efficiency, short response time, high definition and contrast, near 180 ° viewing angle, wide use temperature range, can be achieved Many advantages such as flexible display and large-area full-color display are recognized by the industry as the most promising display devices.
  • OLED display devices can be divided into passive matrix OLED (Passive Matrix OLED) according to the driving method
  • AMOLED has pixels arranged in an array, which is an active display type and has high luminous efficacy, and is generally used as a high-definition large-size display device.
  • AMOL ED is a current-driven device. When a current flows through the organic light-emitting diode, the organic light-emitting diode emits light, and the light emission brightness is determined by the current flowing through the organic light-emitting diode itself.
  • Most existing integrated circuits Integrated Circuit, 1C
  • the pixel driving circuit of AMOLED needs to complete the task of converting voltage signals into current signals.
  • a pixel driving circuit commonly seen includes: a first thin film transistor T10, a second thin film transistor T20, a third thin film transistor T30, a fourth thin film transistor T40, a fifth thin film transistor T50, A sixth thin film transistor T60, a storage capacitor C10, and an organic light emitting diode D10, the gate of the first thin film transistor T10 receives the scan signal Gate, the source is electrically connected to the first node A0, and the drain is electrically connected to the second section ABO
  • the gate of the second thin film transistor T20 is electrically connected to the first node AO, the drain receives the power supply high voltage Vdd, and the source is electrically connected to the second node B0;
  • the gate of the third thin film transistor T30 receives the light emitting signal EM, the source receives the data signal Data, the drain is electrically connected to the third node C0; the gate of the fourth thin film transistor T40 receives the light emitting signal EM, the source is electrically connected
  • the object of the present invention is to provide a pixel driving circuit that can adjust the light emission brightness by a high voltage of the power supply, and has a simple structure and is easy to manufacture.
  • An object of the present invention is also to provide a display device capable of adjusting light emission brightness by a high voltage of a power supply, and having a simple structure and easy manufacturing.
  • the present invention provides a pixel driving circuit, including a loading module, a compensation module electrically connected to the loading module, and a light-emitting module electrically connected to the compensation module;
  • the loading module is used to receive a reset signal and a lighting signal, and input an initialization signal to the compensation module under the control of the reset signal, and input a data signal to the compensation module under the control of the lighting signal;
  • the compensation module is used to receive a scan signal, and under the control of the scan signal, receive a high voltage of the power supply to perform a threshold voltage compensation;
  • the light emitting module is used for receiving a light emitting signal, and receiving a high voltage of the power supply and emitting light under the control of the light emitting signal, and the light emitting brightness can be adjusted by changing the magnitude of the high voltage of the power supply.
  • the compensation module includes a first thin film transistor, a second thin film transistor, and a storage capacitor;
  • the gate of the first thin film transistor receives the scan signal, the source is electrically connected to the first node, and the drain is electrically connected to the second node;
  • the gate of the second thin film transistor is electrically connected to the first node, the drain receives the high voltage of the power supply, and the source is electrically connected to the second node;
  • the first end of the storage capacitor is electrically connected to the first node, and the second end is electrically connected to the third node;
  • the loading module is electrically connected to the first node and the third node, and the light emitting module is electrically connected to the second node and the third node.
  • the light emitting module includes: a third thin film transistor, a fourth thin film transistor and an organic light emitting diode; [0017] the gate of the third thin film transistor receives a light emitting signal, the source receives a high voltage power supply, and the drain is electrically Connect the third node;
  • the gate of the fourth thin film transistor receives the light-emitting signal, the source is electrically connected to the second node, and the drain is electrically connected to the anode of the organic light-emitting diode;
  • the cathode of the organic light emitting diode receives a low power supply voltage.
  • the loading module includes: a fifth thin film transistor and a sixth thin film transistor;
  • the gate of the fifth thin film transistor receives the light-emitting signal, the source receives the data signal, and the drain is electrically connected to the third node;
  • the gate of the sixth thin film transistor receives a reset signal, the source receives an initialization signal, and the drain is electrically connected to the first node.
  • the first thin film transistor, the second thin film transistor, the third thin film transistor, the fourth thin film transistor and the sixth thin film transistor are all P -type thin film transistors, and the fifth thin film transistor is an N-type thin film transistor.
  • the working process of the pixel driving circuit includes a loading phase, a compensation phase and a light-emitting phase in sequence;
  • the reset signal is at a low potential, and the scan signal and the light-emitting signal are at a high potential;
  • the scan signal is low potential, the reset signal and the light-emitting signal are high potential;
  • the light-emitting phase In the light-emitting phase, the light-emitting signal is low potential, the scan signal and the reset signal are high Potential.
  • the voltage of the first node is Vint
  • the voltage of the third node is Vdata
  • Vint is the voltage of the initialization signal
  • Vdata is the voltage of the data signal
  • the voltage of the first node is -lWIi] :
  • the voltage of the second node is Vdd
  • the voltage of the third node is Vdata
  • Vth is the threshold voltage of the second thin film transistor
  • Vdd is the high voltage of the power supply
  • Vdata is the voltage of the data signal.
  • the voltage of the first node is The voltage of the second node is Vdd
  • the voltage of the third node is Vdd
  • vth is the threshold voltage of the second thin film transistor
  • Vdd is the high voltage of the power supply
  • Vdata is the voltage of the data signal.
  • the present invention also provides a display device including the above pixel driving circuit.
  • the present invention provides a pixel driving circuit, including a loading module, a compensation module electrically connected to the loading module, and a light-emitting module electrically connected to the compensation module;
  • the loading module is used to receive a reset signal and a light-emitting signal, and input an initialization signal to the compensation module under the control of the reset signal, and a data signal to the compensation module under the control of the light-emitting signal;
  • the compensation module is used to receive a scan signal, and Under the control of the scan signal, the high voltage of the power supply is received to perform the compensation of the threshold voltage;
  • the pixel driving circuit can not only effectively compensate the threshold power supply, but also adjust the light emission brightness through the high voltage of the power supply, and has a simple structure and is easy to manufacture.
  • the invention also provides a display device which can adjust the light-emitting brightness by the high voltage of the power supply, and has a simple structure and is easy to manufacture.
  • FIG. 1 is a circuit diagram of a conventional pixel driving circuit
  • FIG. 2 is a schematic diagram of a pixel driving circuit of the present invention.
  • FIG. 3 is a circuit diagram of a pixel driving circuit of the present invention.
  • FIG. 4 is a working waveform diagram of the pixel driving circuit of the present invention.
  • the present invention provides a pixel driving circuit, including a loading module 1, a compensation module 2 electrically connected to the loading module 1, and an electrical connection to the compensation module 2
  • the loading module 1 is configured to receive a reset signal Reset and a light-emitting signal EM, and input an initialization signal Int to the compensation module 2 under the control of the reset signal Reset, and input data to the compensation module 2 under the control of the light-emitting signal EM Signal Data;
  • the compensation module 2 is configured to receive a scanning signal Gate, and receive a power supply high voltage Vdd under the control of the scanning signal Gate to perform threshold voltage compensation;
  • the light-emitting module 3 is used to receive the light-emitting signal EM, and under the control of the light-emitting signal EM to receive the power supply high voltage Vdd and emit light, and the light emission brightness can be adjusted by changing the size of the power supply high voltage Vdd.
  • the compensation module 2 includes a first thin film transistor T1, a second thin film transistor T2 and a storage capacitor C1;
  • the gate of the first thin film transistor T1 receives the scan signal Gate, the source is electrically connected to the first node A, and the drain is electrically connected to the second node B;
  • the gate of the second thin film transistor T2 is electrically connected to the first node A, and the drain receives the power supply high voltage Vdd
  • the source is electrically connected to the second node B;
  • the first end of the storage capacitor C1 is electrically connected to the first node A, and the second end is electrically connected to the third node C;
  • the loading module 1 is electrically connected to the first node A and the third node C, and the light emitting module 3 is electrically connected to the second node B and the third node C.
  • the light emitting module 3 includes: a third thin film transistor T3, a fourth thin film transistor T4 and an organic light emitting diode D1;
  • the gate of the third thin film transistor T3 receives the light emitting signal EM, the source receives the high voltage of the power supply, and the drain is electrically connected to the third node C;
  • the gate of the fourth thin film transistor T4 receives the light emitting signal EM, the source is electrically connected to the second node B, and the drain is electrically connected to the anode of the organic light emitting diode D1;
  • the cathode of the organic light emitting diode D1 receives a power supply voltage Vss.
  • the loading module 1 includes: a fifth thin film transistor T5 and a sixth thin film transistor T6; [0054] The gate of the fifth thin film transistor T5 receives the light emitting signal EM, the source receives the data signal Data, and the drain is electrically connected to the third node C;
  • the gate of the sixth thin film transistor T6 receives a reset signal Reset, the source receives an initialization signal Int, and the drain is electrically connected to the first node A.
  • the electroluminescent element D1 is an organic light emitting diode
  • the fifth thin-film transistor T5 and the sixth thin-film transistor T6 are amorphous silicon thin-film transistors, deuterium polysilicon thin-film transistors, or metal oxide semiconductor thin-film transistors.
  • the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3 , the fourth thin film transistor T4 and the sixth thin film transistor T6 are all P-type thin film transistors, It is turned on in a deuterium level state and turned off in a high level state.
  • the fifth thin film transistor T5 is an N-type thin film transistor, which is turned on in a high state state and turned off in a deuterium level state.
  • the reset signal Reset, the scanning signal Gate, and the light emitting signal EM are all provided by an external timing controller.
  • the working process of the pixel driving circuit includes a loading stage 10, a compensation stage 20 and a light-emitting stage 30 in sequence;
  • the reset signal Reset is at a low potential
  • the scan signal Gate and the light emitting signal EM are at a high potential
  • the data signal Data is written to the third node C for initialization
  • the signal In t is written into the first node A
  • the initialization signal is an Int-level signal.
  • the scan signal Gate is at a low potential
  • the reset signal Reset and the light-emitting signal EM are at a high potential
  • the power supply high voltage Vdd is written to the second node B
  • the third node continues to write the data signal Data, so that the voltage of the first node A becomes the absolute value of the power supply high voltage Vdd and the threshold voltage of the second thin film transistor T2 (the threshold voltage of the P-type thin film transistor is negative) difference.
  • the light-emitting signal EM is at a low potential
  • the scan signal Gate and the reset signal Reset are at a high potential
  • the power supply high voltage Vdd is written to the third node C, so that The voltage of the first node A changes accordingly, and drives the organic light emitting diode D1 to emit light.
  • the reset signal Reset is a low potential
  • the scan signal Gate and the light-emitting signal EM are a high potential
  • the sixth thin film transistor T6 and the fourth thin film transistor T4 is turned on
  • the first thin film transistor T1, the third thin film transistor T3, and the fifth thin film transistor T5 are turned off
  • the initialization signal Int is written into the first node A through the turned on fourth thin film transistor T4, so that the first node A
  • the data signal Data is written into the third node C through the turned-on sixth thin film transistor T6, so that the voltage of the third node C becomes Vdata, where Vint is the voltage of the initialization signal Int, and Vdata is the data signal Dat a Voltage, and Vint is the voltage level.
  • the scan signal Gate is at a low potential
  • the reset signal Reset and the light-emitting signal EM are at a high potential
  • the first node A is at a low level
  • the sixth thin film transistor T6 the second The thin film transistor T2 and the third thin film transistor T3 are turned on
  • the first thin film transistor T1 the fourth thin film transistor T4 and the fifth thin film transistor T5 are turned off
  • the data signal Data continues to be written into the third through the turned on sixth thin film transistor T6 Node C, so that the voltage of the third node C continues to be Vdata
  • the power supply high voltage Vdd charges the first node A through the second thin film transistor T2 and the third thin film transistor T3, until the first node A and the second node
  • the difference of B is equal to the threshold voltage of the second thin film transistor T2, that is, the voltage of the first node A is complement
  • the voltage of the second node B is Vdd
  • the voltage stored by the storage capacitor C1 is Vdd-1Vth1-Vdata
  • the voltage of the third node C is Vdata, where Vth is the threshold voltage of the second thin film transistor T2;
  • the light-emitting signal EM is low; the potential, the scan signal Gate and the reset signal Re set are high potential, the first thin-film transistor T1, the second thin-film transistor T2 and the fifth thin-film transistor T5 conduct On, the third thin film transistor T3, the fourth thin film transistor T4, and the sixth thin film transistor T6 are turned off, and the power supply high voltage Vdd is written into the third node C through the turned-on fifth thin film transistor T5, under the action of the storage capacitor C1
  • the voltage of the first node A changes with the change of the third node C to keep the voltage stored in the storage capacitor C1 unchanged, that is, the voltage of the first node A is
  • the voltage of the second node B is Vdd
  • the voltage of the third node C is Vdd
  • the current flowing through the organic light emitting diode D1 is:
  • H is the carrier mobility of the second thin film transistor T2
  • Cox is the gate oxide layer capacitance of the second thin film transistor T2
  • W/L is the channel width-to-length ratio of the second thin film transistor T2
  • I is The current flowing through the organic light emitting diode D1, Vgs, is the voltage difference between the gate and the source of the second thin film transistor T2.
  • the current I flowing through the organic light emitting diode D1 has nothing to do with the threshold voltage Vth of the second thin film transistor T2, so that the problem of poor display of the screen caused by the change in the threshold voltage Vth of the second thin film transistor T2 can be eliminated ,
  • the current I flowing through the organic light emitting diode D1 is simultaneously affected by the power supply high voltage Vdd and the voltage Vdata of the data signal Data, so the current I flowing through the organic light emitting diode D1 can be changed by changing the voltage of the power high voltage Vdd and the data signal Data Vdata is changed, so that the brightness of the organic light-emitting diode D1 can be adjusted by changing the size of the power supply high voltage Vdd, and the flexibility of brightness adjustment can be improved.
  • no additional signal lines are required, and the process is more difficult.
  • the present invention also provides a display device including the above pixel driving circuit.
  • the present invention provides a pixel driving circuit, including a loading module, a compensation module electrically connected to the loading module, and a light-emitting module electrically connected to the compensation module;
  • the input module is used to receive the reset signal and the light-emitting signal, and input the initialization signal to the compensation module under the control of the reset signal, and input the data signal to the compensation module under the control of the light-emitting signal;
  • the compensation module is used to receive the scan signal, and Under the control of the scanning signal, the high voltage of the power supply is received to perform the compensation of the threshold voltage;
  • the light emitting module is used to receive the light emitting signal and receive the high voltage of the power supply and emit light under the control of the light emitting signal, and the brightness of the light can be changed by changing the size of the high voltage
  • the pixel driving circuit can not only effectively compensate the threshold power supply, but also adjust the light emission brightness through the high voltage of the power supply, and has a simple structure and is easy to manufacture.
  • the invention also provides a

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

一种像素驱动电路及显示装置，像素驱动电路包括载入模块(1)、与载入模块(1)电性连接的补偿模块(2)和与补偿模块(2)电性连接的发光模块(3)；载入模块(1)用于接收复位信号(Reset)及发光信号(EM)，并在复位信号(Reset)的控制下向补偿模块(2)输入初始化信号(Int)，在发光信号(EM)的控制下向补偿模块(2)输入数据信号(Data)；补偿模块(2)用于接收扫描信号(Gate)，并在扫描信号(Gate)的控制下接收电源高电压(Vdd)进行阈值电压的补偿；发光模块(3)用于接收发光信号(EM)，并在发光信号(EM)的控制下接收电源高电压(Vdd)并发光，且发光亮度能够通过改变电源高电压(Vdd)的大小进行调节。该像素驱动电路不仅能够有效补偿阈值电压，还通过电源高电压(Vdd)调整发光亮度，且结构简单，易于制造。

Description

说明书 发明名称：像素驱动电路及显示装置 技术领域
[0001] 本发明涉及显示技术领域， 尤其涉及一种像素驱动电路及显示装置。
背景技术
[0002] 有机发光二极管 (Organic Light Emitting Display， OLED) 显示装置具有自发 光、 驱动电压低、 发光效率高、 响应时间短、 清晰度与对比度高、 近 180°视角、 使用温度范围宽， 可实现柔性显示与大面积全色显示等诸多优点， 被业界公认 为是最有发展潜力的显示装置。
[0003] OLED显示装置按照驱动方式可以分为无源矩阵型 OLED (Passive Matrix OLED
， PMOLED) 和有源矩阵型 OLED (Active Matrix OLED， AMOLED) 两大类， 即直接寻址和薄膜晶体管 (Thin Film
Transistor, TFT) 矩阵寻址两类。 其中， AMOLED具有呈阵列式排布的像素， 属于主动显示类型， 发光效能高， 通常用作高清晰度的大尺寸显示装置。 AMOL ED是电流驱动器件， 当有电流流过有机发光二极管时， 有机发光二极管发光， 且发光亮度由流过有机发光二极管自身的电流决定。 大部分已有的集成电路 (In tegrated Circuit, 1C) 都只传输电压信号， 故 AMOLED的像素驱动电路需要完成 将电压信号转变为电流信号的任务。
[0004] 如图 1所示， 5见有的一种像素驱动电路包括： 第一薄膜晶体管 T10、 第二薄膜晶 体管 T20、 第三薄膜晶体管 T30、 第四薄膜晶体管 T40、 第五薄膜晶体管 T50、 第 六薄膜晶体管 T60、 存储电容 C10及有机发光二极管 D10， 所述第一薄膜晶体管 T 10的栅极接收扫描信号 Gate， 源极电性连接第一节点 A0， 漏极电性连接第二节 ABO; 所述第二薄膜晶体管 T20的栅极电性连接第一节点 AO， 漏极接收电源高 电压 Vdd， 源极电性连接第二节点 B0; 所述第三薄膜晶体管 T30的栅极接收发光 信号 EM， 源极接收数据信号 Data， 漏极电性连接第三节点 C0; 所述第四薄膜晶 体管 T40的栅极接收发光信号 EM， 源极电性连接第二节点 B0， 漏极电性连接有 机发光二极管 D1的阳极； 所述第五薄膜晶体管 T50的栅极接收发光信号 EM， 源 极接收参考信号 Ref， 漏极电性连接第三节点 C0; 所述第六薄膜晶体管 T60的栅 极接收复位信号 Reset， 源极接收初始化信号 Int， 漏极电性连接第一节点 A0; 所 述存储电容 C10的第一端电性连接第一节点 A0, 第二端电性连接第三节点 C0; 所述有机发光二极管 D1的阴极接收电源低电压 Vss， 该像素驱动电路的发光亮度 不仅可以通过数据信号 Data进行调整还可以通过参考信号 Ref进行调整， 但为了 输入参考信号 Ref， 需要在该像素驱动电路中额外增加一条信号线， 造成像素驱 动电路的结构复杂， 制造工艺难度增加。
发明概述
技术问题
[0005] 本发明的目的在于提供一种像素驱动电路， 能够通过电源高电压调整发光亮度 ， 且结构简单， 易于制造。
[0006] 本发明的目的还在于提供一种显示装置， 能够通过电源高电压调整发光亮度， 且结构简单， 易于制造。
问题的解决方案
技术解决方案
[0007] 为实现上述目的， 本发明提供一种像素驱动电路， 包括载入模块、 与所述载入 模块电性连接的补偿模块和与所述补偿模块电性连接的发光模块；
[0008] 所述载入模块用于接收复位信号及发光信号， 并在复位信号的控制下向补偿模 块输入初始化信号， 在发光信号的控制下向补偿模块输入数据信号；
[0009] 所述补偿模块用于接收扫描信号， 并在扫描信号的控制下接收电源高电压进行 阈值电压的补偿；
[0010] 所述发光模块用于接收发光信号， 并在发光信号的控制下接收电源高电压并发 光， 且发光亮度能够通过改变电源高电压的大小进行调节。
[0011] 所述补偿模块包括第一薄膜晶体管、 第二薄膜晶体管及存储电容；
[0012] 所述第一薄膜晶体管的栅极接收扫描信号， 源极电性连接第一节点， 漏极电性 连接第二节点；
[0013] 所述第二薄膜晶体管的栅极电性连接第一节点， 漏极接收电源高电压， 源极电 性连接第二节点； [0014] 所述存储电容的第一端电性连接第一节点， 第二端电性连接第三节点；
[0015] 所述载入模块电性连接所述第一节点及第三节点， 所述发光模块电性连接所述 第二节点和第三节点。
[0016] 所述发光模块包括： 第三薄膜晶体管、 第四薄膜晶体管及有机发光二极管； [0017] 所述第三薄膜晶体管的栅极接收发光信号， 源极接收电源高电压， 漏极电性连 接第三节点；
[0018] 所述第四薄膜晶体管的栅极接收发光信号， 源极电性连接第二节点， 漏极电性 连接有机发光二极管的阳极；
[0019] 所述有机发光二极管的阴极接收电源低电压。
[0020] 所述载入模块包括： 第五薄膜晶体管及第六薄膜晶体管；
[0021] 所述第五薄膜晶体管的栅极接收发光信号， 源极接收数据信号， 漏极电性连接 第三节点；
[0022] 所述第六薄膜晶体管的栅极接收复位信号， 源极接收初始化信号， 漏极电性连 接第一节点。
[0023] 所述第一薄膜晶体管、 第二薄膜晶体管、 第三薄膜晶体管、 第四薄膜晶体管及 第六薄膜晶体管均为 P型薄膜晶体管， 所述第五薄膜晶体管为 N型薄膜晶体管。
[0024] 所述像素驱动电路的工作过程依次包括载入阶段、 补偿阶段及发光阶段；
[0025] 在载入阶段， 所述复位信号为低电位， 扫描信号和发光信号为高电位；
[0026] 在补偿阶段， 所述扫描信号为低电位， 所述复位信号和发光信号为高电位； [0027] 在发光阶段， 所述发光信号为低电位， 所述扫描信号和复位信号为高电位。
[0028] 在载入阶段， 所述第一节点的电压为 Vint， 所述第三节点的电压为 Vdata， 其中 Vint为初始化信号的电压， Vdata为数据信号的电压。
[0029] 在补偿阶段， 所述第一节点的电压为 -lWIi]:
， 所述第二节点的电压为 Vdd， 所述第三节点的电压为 Vdata， 其中 Vth为第二 薄膜晶体管的阈值电压， Vdd为电源高电压， Vdata为数据信号的电压。
[0030] 在发光阶段， 所述第一节点的电压为
Figure imgf000005_0001
， 所述第二节点的电压为 Vdd， 所述第三节点的电压为 Vdd， 其中 vth为第二薄膜 晶体管的阈值电压， Vdd为电源高电压， Vdata为数据信号的电压。
[0031] 本发明还提供一种显示装置， 包括上述的像素驱动电路。
发明的有益效果
有益效果
[0032] 本发明的有益效果： 本发明提供一种像素驱动电路， 包括载入模块、 与所述载 入模块电性连接的补偿模块和与所述补偿模块电性连接的发光模块； 所述载入 模块用于接收复位信号及发光信号， 并在复位信号的控制下向补偿模块输入初 始化信号， 在发光信号的控制下向补偿模块输入数据信号； 所述补偿模块用于 接收扫描信号， 并在扫描信号的控制下接收电源高电压进行阈值电压的补偿； 所述发光模块用于接收发光信号， 并在发光信号的控制下接收电源高电压并发 光， 且发光亮度能够通过改变电源高电压的大小进行调节， 该像素驱动电路不 仅能够有效补偿阈值电源， 还通过电源高电压调整发光亮度， 且结构简单， 易 于制造。 本发明还提供一种显示装置， 能够通过电源高电压调整发光亮度， 且 结构简单， 易于制造。
对附图的简要说明
附图说明
[0033] 为了能更进一步了解本发明的特征以及技术内容， 请参阅以下有关本发明的详 细说明与附图， 然而附图仅提供参考与说明用， 并非用来对本发明加以限制。
[0034] 附图中，
[0035] 图 1为现有的像素驱动电路的电路图；
[0036] 图 2为本发明的像素驱动电路的示意图；
[0037] 图 3为本发明的像素驱动电路的电路图；
[0038] 图 4为本发明的像素驱动电路的工作波形图。
发明实施例
本发明的实施方式
[0039] 为更进一步阐述本发明所采取的技术手段及其效果， 以下结合本发明的优选实 施例及其附图进行详细描述。
[0040] 请参阅图 2至图 4， 本发明提供一种像素驱动电路， 包括载入模块 1、 与所述载 入模块 1电性连接的补偿模块 2和与所述补偿模块 2电性连接的发光模块 3;
[0041] 所述载入模块 1用于接收复位信号 Reset及发光信号 EM， 并在复位信号 Reset的 控制下向补偿模块 2输入初始化信号 Int， 在发光信号 EM的控制下向补偿模块 2输 入数据信号 Data;
[0042] 所述补偿模块 2用于接收扫描信号 Gate, 并在扫描信号 Gate的控制下接收电源 高电压 Vdd进行阈值电压的补偿；
[0043] 所述发光模块 3用于接收发光信号 EM， 并在发光信号 EM的控制下接收电源高 电压 Vdd并发光， 且发光亮度能够通过改变电源高电压 Vdd的大小进行调节。
[0044] 具体地， 如图 3所示， 在本发明的具体实施例中， 所述补偿模块 2包括第一薄膜 晶体管 T1、 第二薄膜晶体管 T2及存储电容 C1;
[0045] 所述第一薄膜晶体管 T1的栅极接收扫描信号 Gate， 源极电性连接第一节点 A， 漏极电性连接第二节点 B;
[0046] 所述第二薄膜晶体管 T2的栅极电性连接第一节点 A， 漏极接收电源高电压 Vdd
， 源极电性连接第二节点 B;
[0047] 所述存储电容 C1的第一端电性连接第一节点 A， 第二端电性连接第三节点 C;
[0048] 所述载入模块 1电性连接所述第一节点 A及第三节点 C， 所述发光模块 3电性连 接所述第二节点 B和第三节点 C。
[0049] 进一步地， 在本发明的具体实施例中， 所述发光模块 3包括： 第三薄膜晶体管 T3、 第四薄膜晶体管 T4及有机发光二极管 D1;
[0050] 所述第三薄膜晶体管 T3的栅极接收发光信号 EM， 源极接收电源高电压， 漏极 电性连接第三节点 C;
[0051] 所述第四薄膜晶体管 T4的栅极接收发光信号 EM， 源极电性连接第二节点 B， 漏极电性连接有机发光二极管 D1的阳极；
[0052] 所述有机发光二极管 D1的阴极接收电源彳氐电压 Vss。
[0053] 进一步地， 在本发明的具体实施例中， 所述载入模块 1包括： 第五薄膜晶体管 T5及第六薄膜晶体管 T6; [0054] 所述第五薄膜晶体管 T5的栅极接收发光信号 EM， 源极接收数据信号 Data， 漏 极电性连接第三节点 C;
[0055] 所述第六薄膜晶体管 T6的栅极接收复位信号 Reset， 源极接收初始化信号 Int， 漏极电性连接第一节点 A。
[0056] 具体地， 在本实施例中， 所述电致发光元件 D1为有机发光二极管， 所述第一 薄膜晶体管 T1、 第二薄膜晶体管 T2、 第三薄膜晶体管 T3、 第四薄膜晶体管 T4、 第五薄膜晶体管 T5及第六薄膜晶体管 T6为非晶硅薄膜晶体管、 彳氐温多晶硅薄膜 晶体管或金属氧化物半导体薄膜晶体管。
[0057] 优选地， 在本实施例中， 所述第一薄膜晶体管 T1、 第二薄膜晶体管 T2、 第三 薄膜晶体管 T3、 第四薄膜晶体管 T4及第六薄膜晶体管 T6均为 P型薄膜晶体管， 其在彳氐电平状态下导通， 高电平状态下截止， 所述第五薄膜晶体管 T5为 N型薄 膜晶体管， 其在高电平状态下导通， 彳氐电平状态下截止。
[0058] 具体地， 所述复位信号 Reset、 扫描信号 Gate及发光信号 EM均通过外部时序控 制器提供。
[0059] 需要说明的是， 请参阅图 4, 所述像素驱动电路的工作过程依次包括载入阶段 1 0、 补偿阶段 20及发光阶段 30;
[0060] 所述载入阶段 10， 所述复位信号 Reset为低电位， 扫描信号 Gate和发光信号 EM 为高电位， 在所述载入阶段 10所述数据信号 Data写入第三节点 C， 初始化信号 In t写入第一节点 A， 所述初始化信号为 Int—彳氐电平信号。
[0061] 所述补偿阶段 20， 所述扫描信号 Gate为低电位， 所述复位信号 Reset和发光信 号 EM为高电位， 在所述补偿阶段 20， 所述电源高电压 Vdd写入第二节点 B， 所 述第三节点继续写入数据信号 Data， 使得第一节点 A的电压变为电源高电压 Vdd 与第二薄膜晶体管 T2的阈值电压 （P型薄膜晶体管的阈值电压为负） 的绝对值的 差。
[0062] 所述发光阶段 30， 所述发光信号 EM为低电位， 所述扫描信号 Gate和复位信号 Reset为高电位， 在发光阶段 30, 所述电源高电压 Vdd写入第三节点 C， 使得第 一节点 A电压随之改变， 并驱动有机发光二极管 D1发光。
[0063] 请继续参阅图 4, 并结合图 2详细说明所述像素驱动电路的工作过程 [0064] 请参阅图 2及图 4, 在载入阶段 10, 所述复位信号 Reset为低电位， 扫描信号 Gat e和发光信号 EM为高电位， 所述第六薄膜晶体管 T6及第四薄膜晶体管 T4导通， 所述第一薄膜晶体管 T1、 第三薄膜晶体管 T3及第五薄膜晶体管 T5截止， 初始化 信号 Int经导通的第四薄膜晶体管 T4写入第一节点 A， 使得第一节点 A的电压变 为 Vint， 数据信号 Data经导通的第六薄膜晶体管 T6写入第三节点 C， 使得第三节 点 C的电压变为 Vdata， 其中 Vint为初始化信号 Int的电压， Vdata为数据信号 Dat a的电压， 且 Vint为彳氐电平。
[0065] 在补偿阶段 20， 所述扫描信号 Gate为低电位， 所述复位信号 Reset和发光信号 EM为高电位， 第一节点 A为彳氐电平， 所述第六薄膜晶体管 T6、 第二薄膜晶体管 T2及第三薄膜晶体管 T3导通， 所述第一薄膜晶体管 T1、 第四薄膜晶体管 T4及第 五薄膜晶体管 T5截止， 数据信号 Data经导通的第六薄膜晶体管 T6继续写入第三 节点 C， 使得第三节点 C的电压继续保持为 Vdata， 电源高电压 Vdd经导通的第 二薄膜晶体管 T2和第三薄膜晶体管 T3为第一节点 A充电， 直至第一节点 A和第二 节点 B的差值等于第二薄膜晶体管 T2的阈值电压， 也即所述第一节点 A的电压为 補-|刪
， 所述第二节点 B的电压为 Vdd， 存储电容 Cl存储的电压为 Vdd -lVthl- Vdata ， 所述第三节点 C的电压为 Vdata， 其中 Vth为第二薄膜晶体管 T2的阈值电压； [0066] 在发光阶段 30， 所述发光信号 EM为低;电位， 所述扫描信号 Gate和复位信号 Re set为高电位， 所述第一薄膜晶体管 T1、 第二薄膜晶体管 T2及第五薄膜晶体管 T5 导通， 第三薄膜晶体管 T3、 第四薄膜晶体管 T4及第六薄膜晶体管 T6截止， 所述 电源高电压 Vdd经过导通的第五薄膜晶体管 T5写入第三节点 C， 在存储电容 C1 的作用下， 第一节点 A的电压随着第三节点 C的变化而变化， 以保持存储电容 C1 中存储的电压不变， 也即所述第一节点 A的电压为
Figure imgf000009_0001
， 所述第二节点 B的电压为 Vdd， 所述第三节点 C的电压为 Vdd
[0067] 流过有机发光二极管 D1的电流为：
[]
Figure imgf000010_0001
[0068] 其中， H为第二薄膜晶体管 T2的载流子迁移率， Cox为第二薄膜晶体管 T2的栅 氧化层电容， W/L为第二薄膜晶体管 T2的沟道宽长比， I为流过有机发光二极管 D1的电流， Vgs为第二薄膜晶体管 T2的栅极与源极的电压差。
[0069] 据此可知， 流过有机发光二极管 D1的电流 I与第二薄膜晶体管 T2的阈值电压 Vt h无关， 从而可以消除第二薄膜晶体管 T2的阈值电压 Vth改变而引起的画面显示 不良的问题， 并且流过有机发光二极管 D1的电流 I同时受到电源高电压 Vdd和数 据信号 Data的电压 Vdata的影响， 因此流过有机发光二极管 D1的电流 I可通过改 变电源高电压 Vdd和数据信号 Data的电压 Vdata进行改变， 从而能够通过改变电 源高电压 Vdd的大小调节有机发光二极管 D1的发光亮度， 提升亮度调节的灵活 性， 且相比于现有技术， 无需额外增加信号线， 制程难度较 f氐。
[0070] 本发明还提供一种显示装置， 包括上述的像素驱动电路。
[0071] 综上所述， 本发明提供一种像素驱动电路， 包括载入模块、 与所述载入模块电 性连接的补偿模块和与所述补偿模块电性连接的发光模块； 所述载入模块用于 接收复位信号及发光信号， 并在复位信号的控制下向补偿模块输入初始化信号 ， 在发光信号的控制下向补偿模块输入数据信号； 所述补偿模块用于接收扫描 信号， 并在扫描信号的控制下接收电源高电压进行阈值电压的补偿； 所述发光 模块用于接收发光信号， 并在发光信号的控制下接收电源高电压并发光， 且发 光亮度能够通过改变电源高电压的大小进行调节， 该像素驱动电路不仅能够有 效补偿阈值电源， 还通过电源高电压调整发光亮度， 且结构简单， 易于制造。 本发明还提供一种显示装置， 能够通过电源高电压调整发光亮度， 且结构简单 ， 易于制造。
[0072] 以上所述， 对于本领域的普通技术人员来说， 可以根据本发明的技术方案和技 术构思作出其他各种相应的改变和变形， 而所有这些改变和变形都应属于本发 明权利要求的保护范围。

Claims

权利要求书
[权利要求 1] 一种像素驱动电路， 包括载入模块、 与所述载入模块电性连接的补偿 模块和与所述补偿模块电性连接的发光模块；
所述载入模块用于接收复位信号及发光信号， 并在复位信号的控制下 向补偿模块输入初始化信号， 在发光信号的控制下向补偿模块输入数 据信号；
所述补偿模块用于接收扫描信号， 并在扫描信号的控制下接收电源高 电压进行阈值电压的补偿；
所述发光模块用于接收发光信号， 并在发光信号的控制下接收电源高 电压并发光， 且发光亮度能够通过改变电源高电压的大小进行调节。
[权利要求 2] 如权利要求 1所述的像素驱动电路， 其中， 所述补偿模块包括第一薄 膜晶体管、 第二薄膜晶体管及存储电容；
所述第一薄膜晶体管的栅极接收扫描信号， 源极电性连接第一节点， 漏极电性连接第二节点；
所述第二薄膜晶体管的栅极电性连接第一节点， 漏极接收电源高电压 ， 源极电性连接第二节点；
所述存储电容的第一端电性连接第一节点， 第二端电性连接第三节点 所述载入模块电性连接所述第一节点及第三节点， 所述发光模块电性 连接所述第二节点和第三节点。
[权利要求 3] 如权利要求 2所述的像素驱动电路， 其中， 所述发光模块包括： 第三 薄膜晶体管、 第四薄膜晶体管及有机发光二极管； 所述第三薄膜晶体管的栅极接收发光信号， 源极接收电源高电压， 漏 极电性连接第三节点；
所述第四薄膜晶体管的栅极接收发光信号， 源极电性连接第二节点， 漏极电性连接有机发光二极管的阳极；
所述有机发光二极管的阴极接收电源低电压。
[权利要求 4] 如权利要求 3所述的像素驱动电路， 其中， 所述载入模块包括： 第五 薄膜晶体管及第六薄膜晶体管；
所述第五薄膜晶体管的栅极接收发光信号， 源极接收数据信号， 漏极 电性连接第三节点；
所述第六薄膜晶体管的栅极接收复位信号， 源极接收初始化信号， 漏 极电性连接第一节点。
［权利要求 5］ 如权利要求 4所述的像素驱动电路， 其中， 所述第一薄膜晶体管、 第 二薄膜晶体管、 第三薄膜晶体管、 第四薄膜晶体管及第六薄膜晶体管 均为 P型薄膜晶体管， 所述第五薄膜晶体管为 N型薄膜晶体管。
［权利要求 6］ 如权利要求 5所述的像素驱动电路， 其中， 所述像素驱动电路的工作 过程依次包括载入阶段、 补偿阶段及发光阶段； 在所述载入阶段， 所述复位信号为低电位， 扫描信号和发光信号为高 电位；
在所述补偿阶段， 所述扫描信号为低电位， 所述复位信号和发光信号 为高电位；
在所述发光阶段， 所述发光信号为低电位， 所述扫描信号和复位信号 为高电位。
［权利要求 7］ 如权利要求 6所述的像素驱动电路， 其中， 在载入阶段， 所述第一节 点的电压为 Vint， 所述第三节点的电压为 Vdata， 其中 Vint为初始化信 号的电压， Vdata为数据信号的电压。
［权利要求 8］ 如权利要求 6所述的像素驱动电路， 其中， 在补偿阶段， 所述第一节 点的电压为 補 -峰|
， 所述第二节点的电压为 Vdd， 所述第三节点的电压为 Vdata， 其中 V th为第二薄膜晶体管的阈值电压， Vdd为电源高电压， Vdata为数据信 号的电压。
［权利要求 9］ 如权利要求 6所述的像素驱动电路， 其中， 在发光阶段， 所述第一节 点的电压为 補-［刺- 施刪 4 ， 所述第二节点的电压为 Vdd， 所述第三节点的电压为 Vdd， 其中 Vth 为第二薄膜晶体管的阈值电压， Vdd为电源高电压， Vdata为数据信 号的电压。
[权利要求 10] 一种显示装置， 包括像素驱动电路， 所述像素驱动电路包括载入模块 、 与所述载入模块电性连接的补偿模块和与所述补偿模块电性连接的 发光模块；
所述载入模块用于接收复位信号及发光信号， 并在复位信号的控制下 向补偿模块输入初始化信号， 在发光信号的控制下向补偿模块输入数 据信号；
所述补偿模块用于接收扫描信号， 并在扫描信号的控制下接收电源高 电压进行阈值电压的补偿；
所述发光模块用于接收发光信号， 并在发光信号的控制下接收电源高 电压并发光， 且发光亮度能够通过改变电源高电压的大小进行调节。
[权利要求 11] 如权利要求 10所述的显示装置， 其中， 所述补偿模块包括第一薄膜晶 体管、 第二薄膜晶体管及存储电容；
所述第一薄膜晶体管的栅极接收扫描信号， 源极电性连接第一节点， 漏极电性连接第二节点；
所述第二薄膜晶体管的栅极电性连接第一节点， 漏极接收电源高电压 ， 源极电性连接第二节点；
所述存储电容的第一端电性连接第一节点， 第二端电性连接第三节点 所述载入模块电性连接所述第一节点及第三节点， 所述发光模块电性 连接所述第二节点和第三节点。
[权利要求 12] 如权利要求 11所述的显示装置， 其中， 所述发光模块包括： 第三薄膜 晶体管、 第四薄膜晶体管及有机发光二极管；
所述第三薄膜晶体管的栅极接收发光信号， 源极接收电源高电压， 漏 极电性连接第三节点；
所述第四薄膜晶体管的栅极接收发光信号， 源极电性连接第二节点， 漏极电性连接有机发光二极管的阳极；
所述有机发光二极管的阴极接收电源低电压。
[权利要求 13] 如权利要求 12所述的显示装置， 其中， 所述载入模块包括： 第五薄膜 晶体管及第六薄膜晶体管；
所述第五薄膜晶体管的栅极接收发光信号， 源极接收数据信号， 漏极 电性连接第三节点；
所述第六薄膜晶体管的栅极接收复位信号， 源极接收初始化信号， 漏 极电性连接第一节点。
[权利要求 14] 如权利要求 13所述的显示装置， 其中， 所述第一薄膜晶体管、 第二薄 膜晶体管、 第三薄膜晶体管、 第四薄膜晶体管及第六薄膜晶体管均为 P型薄膜晶体管， 所述第五薄膜晶体管为 N型薄膜晶体管。
[权利要求 15] 如权利要求 14所述的显示装置， 其中， 所述像素驱动电路的工作过程 依次包括载入阶段、 补偿阶段及发光阶段；
在所述载入阶段， 所述复位信号为低电位， 扫描信号和发光信号为高 电位；
在所述补偿阶段， 所述扫描信号为低电位， 所述复位信号和发光信号 为高电位；
在所述发光阶段， 所述发光信号为低电位， 所述扫描信号和复位信号 为高电位。
[权利要求 16] 如权利要求 15所述的显示装置， 其中， 在载入阶段， 所述第一节点的 电压为 Vint， 所述第三节点的电压为 Vdata， 其中 Vint为初始化信号的 电压， Vdata为数据信号的电压。
[权利要求 17] 如权利要求 15所述的显示装置， 其中， 在补偿阶段， 所述第一节点的 电压为
V4d-[¥tli|
， 所述第二节点的电压为 Vdd， 所述第三节点的电压为 Vdata， 其中 V th为第二薄膜晶体管的阈值电压， Vdd为电源高电压， Vdata为数据信 号的电压。 [权利要求 18] 如权利要求 15所述的显示装置， 其中， 在发光阶段， 所述第一节点的 电压为 嘯~|侧 -V 魅刪 d
， 所述第二节点的电压为 Vdd， 所述第三节点的电压为 Vdd， 其中 Vth 为第二薄膜晶体管的阈值电压， Vdd为电源高电压， Vdata为数据信 号的电压。
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CN107170412A (zh) * 2017-07-11 2017-09-15 深圳市华星光电半导体显示技术有限公司 一种amoled像素驱动电路及像素驱动方法
CN107591123A (zh) * 2017-09-29 2018-01-16 深圳市华星光电半导体显示技术有限公司 像素驱动电路及有机发光二极管显示器

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