WO2015169006A1 - 一种像素驱动电路及其驱动方法和显示装置 - Google Patents

一种像素驱动电路及其驱动方法和显示装置 Download PDF

Info

Publication number
WO2015169006A1
WO2015169006A1 PCT/CN2014/084631 CN2014084631W WO2015169006A1 WO 2015169006 A1 WO2015169006 A1 WO 2015169006A1 CN 2014084631 W CN2014084631 W CN 2014084631W WO 2015169006 A1 WO2015169006 A1 WO 2015169006A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
driving
unit
signal end
input
Prior art date
Application number
PCT/CN2014/084631
Other languages
English (en)
French (fr)
Inventor
玄明花
金泰逵
Original Assignee
京东方科技集团股份有限公司
鄂尔多斯市源盛光电有限责任公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司, 鄂尔多斯市源盛光电有限责任公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/442,391 priority Critical patent/US9886898B2/en
Priority to EP14861171.8A priority patent/EP3142100B1/en
Publication of WO2015169006A1 publication Critical patent/WO2015169006A1/zh

Links

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]
    • G09G3/3225—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]
    • 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
    • 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
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/043—Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
    • 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
    • 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
    • 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
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel 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
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing

Definitions

  • Pixel driving circuit driving method thereof and display device
  • the present invention relates to the field of display technologies, and in particular, to a pixel driving circuit, a driving method thereof, and a display device. Background technique
  • AMOLED Active Matrix Organic Light Emitting Diode
  • the threshold voltage ( ⁇ 3 ⁇ 4) of the driving TFTs at each pixel is uneven, and the threshold voltage of the driving TFTs of each pixel (ie, ⁇ 2 in the figure) is uneven, which results in The current flowing through the OLED at each pixel changes, thereby affecting the display of the entire image.
  • Embodiments of the present invention provide a pixel driving circuit, a driving method thereof, and a display device, which can avoid the influence of a threshold voltage drift of a driving transistor on a driving current of an active light emitting device, thereby improving uniformity of a display image.
  • a pixel driving circuit including a light emitting device, a storage capacitor, a driving unit, and five switching units;
  • Each of the switch units includes a control end, a first signal end, and a second signal end; wherein the control end of the switch unit is configured to input a control signal to turn the first signal end and the second signal end on or off;
  • the driving unit includes a control end, a signal input end and a driving end, wherein the control end and the signal input end of the driving unit are used for controlling the output of the driving signal at the driving end;
  • the control end of the first switching unit is configured to input a reset signal, a first signal terminal of a switching unit is used for inputting an initialization level;
  • a control end of the second switch unit is configured to input a first scan signal, and a first signal end of the second switch unit is connected to a second signal end of the first switch unit;
  • a first pole of the storage capacitor is connected to the first signal end of the second switch unit;
  • a control end of the third switch unit is configured to input a second scan signal, and a first signal end of the third switch unit is used for inputting a data signal, a second signal end of the three switch unit is connected to the second pole of the storage capacitor;
  • the control end of the fourth switch unit is configured to input a third scan signal, the first signal end of the fourth switch unit is used to input a first level, and the second signal end of the fourth switch unit is connected to the second end of the storage capacitor Extremely
  • the control end of the fifth switch unit is configured to input a fourth scan signal, and the first signal end of the fifth switch unit is connected to the second signal end of the second switch unit;
  • a control end of the driving unit is connected to the first pole of the storage capacitor, a signal input end of the driving unit is used to input the first level, and a driving end of the driving unit is connected to the first signal end of the fifth switching unit;
  • a first pole of the light emitting device is coupled to the second signal terminal of the fifth switching unit, and a second pole of the light emitting device is input to the second level.
  • all scan signals are input to the control terminal of the corresponding switch unit through the scan line.
  • control end of the fifth switch unit and the control end of the fourth switch unit are respectively connected to different scan lines, and the third scan signal and the fourth scan signal are not synchronized.
  • control end of the second switch unit and the control end of the third switch unit are connected to the same scan line.
  • the switching unit is a switching transistor, and the gate of the switching transistor is used a control terminal of the switching unit, a source and a drain of the switching transistor are respectively used as a first signal end and a second signal end of the switching unit, or a source and a drain of the switching transistor are respectively The second signal end and the first signal end of the switching unit are used.
  • the driving unit is a driving transistor, a gate of the driving transistor is used as a control end of the driving unit, and a source of the driving transistor is used as a signal input end of the driving unit, and the driving The drain of the transistor serves as the driving end of the driving unit.
  • a method of driving a pixel circuit including:
  • the first signal end and the second signal end of the first switching unit are turned on, the first signal end and the second signal end of the fourth switching unit are turned on, and the initialization level and the first level are charged by the storage capacitor;
  • the first signal end and the second signal end of the second switching unit are turned on, the first signal end and the second signal end of the third switching unit are turned on, and the data signal is written into the second pole of the storage capacitor, and is stored.
  • the first pole of the capacitor is discharged until the voltage difference between the control terminal and the signal input terminal of the driving unit is equal to the threshold voltage of the driving unit;
  • the driving unit In the third stage, the first signal end and the second signal end of the fourth switch unit are turned on, the first signal end and the second signal end of the fifth switch unit are turned on, and the first level coupling increases the storage capacitor first The potential of the pole, the driving unit outputs a driving signal at the driving end to drive the light emitting device to emit light under the control of the first pole output voltage of the storage capacitor.
  • the switch unit is a switching transistor, including an off state and a conduction state.
  • the driving unit is a driving transistor
  • the driving transistor in the third stage, the driving transistor is in a saturated state.
  • a display device comprising the pixel driving circuit of any of the above.
  • Embodiments of the present invention provide a pixel driving circuit, a driving method thereof, and a display device, which can avoid the influence of threshold voltage drift of a driving transistor on a driving current of an active light emitting device by voltage compensation, thereby improving uniformity of display images.
  • FIG. 1 is a schematic structural diagram of a pixel driving circuit of the prior art
  • FIG. 2 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present invention
  • FIG. 4 is a pixel driving circuit according to another embodiment of the present invention
  • 5a is a schematic diagram of an equivalent circuit of a pixel driving circuit in a first stage according to an embodiment of the present invention
  • 5b is a schematic diagram of an equivalent circuit of a pixel driving circuit in a second stage according to an embodiment of the present invention
  • FIG. 5c is a schematic diagram of an equivalent circuit of a pixel driving circuit in a third stage according to an embodiment of the present invention. detailed description
  • the switching transistor and the driving transistor used in all the embodiments of the present invention may be a thin film transistor or a field effect transistor or other devices having the same characteristics. Since the source and the drain of the switching transistor used herein are symmetrical, the source thereof, The drains are interchangeable. In the embodiment of the present invention, in order to distinguish the two poles of the transistor except the gate, one of the poles is referred to as a source and the other pole is referred to as a drain. According to the form in the drawing, the middle end of the transistor is the gate, the signal input end is the source, and the signal output end is the drain.
  • the switching transistor used in the embodiment of the present invention includes two types of a P-type switching transistor and an N-type switching transistor, wherein the P-type switching transistor is turned on when the gate is at a low level, and is turned off when the gate is at a high level, and the N-type switch is turned off.
  • the transistor is turned on when the gate is at a high level, and is turned off when the gate is at a low level.
  • the driving transistor used in the embodiment of the present invention includes a P type and an N type, wherein the P type driving transistor has a low level at the gate voltage (gate) The pole voltage is less than the source voltage), and the absolute value of the gate source voltage difference is greater than the threshold voltage, and is in an amplified state or a saturated state; wherein the N-type driving crystal
  • the gate voltage of the body tube is at a high level (the gate voltage is greater than the source voltage), and the absolute value of the voltage difference of the gate source is greater than the threshold voltage, and is in an amplified state or a saturated state.
  • FIG. 2 is a pixel driving circuit according to an embodiment of the present invention, which includes a light emitting device, a storage capacitor, a driving unit, and five switching units;
  • Each of the switch units includes a control end, a first signal end, and a second signal end; wherein the control end of the switch unit is configured to input a control signal to turn the first signal end and the second signal end on or off;
  • the driving unit includes a control end, a signal input end and a driving end, wherein the control end and the signal input end of the driving unit are used for controlling the output of the driving signal at the driving end;
  • the control end of the first switching unit is configured to input a reset signal, a first signal terminal of a switching unit is used for inputting an initialization level;
  • a control end of the second switch unit is configured to input a first scan signal, and a first signal end of the second switch unit is connected to a second signal end of the first switch unit;
  • a first pole of the storage capacitor is connected to the first signal end of the second switch unit
  • the control end of the third switch unit is configured to input a second scan signal, the first signal end of the third switch unit is used for inputting a data signal, and the second signal end of the third switch unit is connected to the second pole of the storage capacitor;
  • the control end of the fourth switch unit is configured to input a third scan signal, the first signal end of the fourth switch unit is used to input a first level, and the second signal end of the fourth switch unit is connected to the second end of the storage capacitor Extremely
  • the control end of the fifth switch unit is configured to input a fourth scan signal, and the first signal end of the fifth switch unit is connected to the second signal end of the second switch unit;
  • a control end of the driving unit is connected to the first pole of the storage capacitor, a signal input end of the driving unit is used to input the first level, and a driving end of the driving unit is connected to the first signal end of the fifth switching unit;
  • a first pole of the light emitting device is coupled to the second signal terminal of the fifth switching unit, and a second pole of the light emitting device is input to the second level.
  • all scan signals are input to the control terminal of the corresponding switch unit through the scan line.
  • the control terminal of the second switching unit and the control terminal of the third switching unit are connected to the same scan line. It can be understood that connecting the same scan lines causes the control terminals of the plurality of switch units to input scan signals of the same timing.
  • each switch unit and the driving unit are marked in the form of numbers 1, 2, 3, wherein the control end of each switch unit is terminal 3, the first letter The terminal is terminal 1, the second signal terminal is terminal 2; the control terminal of the driving unit is terminal 3, the signal input terminal is terminal 1 and the driving terminal is terminal 2.
  • the pixel driving circuit provided by the embodiment of the present invention can avoid the influence of the threshold voltage drift of the driving transistor on the driving current of the active light emitting device by voltage compensation, thereby improving the uniformity of the display image.
  • Embodiments of the present invention also provide a driving method for the above pixel driving circuit, including:
  • the first signal end and the second signal end of the first switching unit are turned on, the first signal end and the second signal end of the fourth switching unit are turned on, and the initialization level and the first level are charged by the storage capacitor;
  • the first signal end and the second signal end of the second switching unit are turned on, the first signal end and the second signal end of the third switching unit are turned on, and the data signal is written into the second pole of the storage capacitor, and is stored.
  • the first pole of the capacitor is discharged until the voltage difference between the control terminal and the signal input terminal of the driving unit is equal to the threshold voltage of the driving unit;
  • the driving unit In the third stage, the first signal end and the second signal end of the fourth switch unit are turned on, the first signal end and the second signal end of the fifth switch unit are turned on, and the first level coupling increases the storage capacitor first The potential of the pole, the driving unit outputs a driving signal at the driving end to drive the light emitting device to emit light under the control of the first pole output voltage of the storage capacitor.
  • each switch unit is: The first signal end and the second signal end of the switch unit are in an off state.
  • only the first signal end and the second signal end of the switch unit are switched to the on state in each stage, so in each stage, except that the first signal end and the second signal end are turned on. Outside the switch unit, it is considered that the first signal end and the second signal end of the other switch units are in an off state.
  • the driving method of the pixel driving circuit provided by the embodiment of the present invention can avoid the influence of the threshold voltage drift of the driving transistor on the driving current of the active light emitting device by voltage compensation, thereby improving the uniformity of the display image.
  • control end of the fifth switch unit and the control end of the fourth switch unit are respectively connected to different scan lines, and the third scan signal and the fourth scan signal are not synchronized. Referring to the driving method of the pixel driving circuit, it can be seen that the turn-on timings of the first signal end and the second signal end of the fourth switching unit are not completely synchronized with the turn-on timings of the first signal end and the second signal end of the fifth switch unit.
  • the design of the different scan lines is respectively connected through the control end of the fifth switch unit and the control end of the fourth switch unit to realize the input
  • the incoming third scan signal and the fourth scan signal are not synchronized, thereby implementing separate control of the fourth switching unit and the fifth switching unit, thereby achieving precise control of the pixel display time and ensuring the stability of the light emitting device.
  • the current of the light-emitting device in the non-light-emitting phase is prevented from flowing, which prolongs the service life of the device.
  • the switching unit is a switching transistor and the driving unit is a driving transistor as an example.
  • the gate of the switching transistor is used as a control terminal of the switching unit, and the source and the drain of the switching transistor are respectively used as the first signal end of the switching unit.
  • a second signal end, or a source and a drain of the switching transistor are respectively used as a second signal end and a first signal end of the switching unit;
  • a gate of the driving transistor is used as the driving unit a control terminal, a source of the driving transistor is used as a signal input end of the driving unit, and a drain of the driving transistor is used as a driving end of the driving unit.
  • a pixel driving circuit comprising five switching transistors (indicated by T1-T5 order) and a driving transistor DTFT and a storage capacitor C1, wherein the storage capacitor includes a first pole (connecting node A) And the second pole (connected to node B).
  • All the transistors in the circuit are described by taking a P-type transistor as an example, wherein the first level is a high level VDD, the second level is a low level VSS, and the first scan line Gate provides a scan signal for T2 and T3,
  • the second scan line EM1 provides a scan signal for T5
  • the third scan line EM2 provides a scan signal for T4
  • the data line Data provides a data signal for the source of T3
  • Vinit provides an initialization level when the reset signal Reset is input
  • VDD and VSS are The light emitting device provides power.
  • the gate input of T1 is input Reset, the source input of T1 is Vinit, the drain of T1 is connected to node A; the gate of T2 is connected to Gate, the source of T2 is connected to node A, and the drain of T2 is connected to the drain of DTFT; the source of T3 The pole is connected to Data, the gate of T3 is connected to Gate, the drain of T3 is connected to node B; the source of T4 is input to VDD, the gate of T4 is connected to EM2, and the drain of T4 is connected to node B; the gate of T5 is connected to EMI, T5 The source is connected to the drain of the DTFT, the drain of T5 is connected to the first pole of the light emitting device, the second pole of the light emitting device is input to VSS, the gate of the DTFT is connected to the node A, and the source of the DTFT is input to VDD.
  • the light emitting device may be an active light emitting diode (OLED). Since the first level is a high level and the second level is a low level, the OLED is a bottom emission type OLED. Preferably, VSS is grounded.
  • OLED active light emitting diode
  • the first stage tl is the pixel initialization phase:
  • the second phase t2 is the data writing phase:
  • the third stage t3 is the lighting stage:
  • the switching transistor and the driving transistor are "P" type transistors as an example.
  • the embodiments of the present invention do not limit the types of the respective switching transistors and driving transistors provided.
  • the driving method of the pixel circuit provided by the embodiment of the present invention is taken as the standard. Those skilled in the art can easily think of the pixel driving circuit and the driving method provided by the embodiments of the present invention. Any combination of and to achieve is within the scope of the present invention.
  • the pixel driving circuit provided by the embodiment of the invention can avoid the influence of the threshold voltage drift of the driving transistor on the driving current of the active light emitting device by voltage compensation, and improve the uniformity of the display image.
  • An embodiment of the present invention further provides a display device comprising: the above pixel driving circuit.
  • the display device can be a display device such as an electronic paper, a mobile phone, a television, a digital photo frame, or the like.
  • the display device provided by the embodiment of the invention can avoid the influence of the threshold voltage drift of the driving transistor on the driving current of the active light emitting device by voltage compensation, thereby improving the uniformity of the display image.

Landscapes

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

Abstract

一种像素驱动电路及其驱动方法和显示装置。该像素驱动电路包括：有源发光二极管（OLED）、存储电容（C1）、驱动晶体管（DTFT）和五个开关晶体管（T1-T5）。该像素驱动电路能够避免驱动晶体管（DTFT）的阈值电压漂移对有源发光二极管（OLED）驱动电流的影响，进而提高显示图像的均匀性。

Description

一种像素驱动电路及其驱动方法和显示装置 技术领域
本发明涉及显示技术领域， 尤其涉及一种像素驱动电路及其驱动 方法和显示装置。 背景技术
有源矩阵有机发光二极管 （Active Matrix Organic Light Emitting Diode, AMOLED )显示器是当今平板显示器研究领域的热点之一。 与 液晶显示器相比， 有机发光二极管 OLED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 (掌上电 脑）、 数码相机等显示领域， OLED已经开始取代传统的 LCD显示屏。 像素驱动电路设计是 AMOLED显示器核心技术内容，具有重要的研究 意义。
与 TFT-LCD ( Thin Film Transistor Liquid Crystal Display, 薄膜场 效应晶体管液晶显示器）利用稳定的电压控制亮度不同， OLED属于电 流驱动， 需要稳定的电流来控制发光。 由于工艺制程和器件老化等原 因，在现有的两个晶体管 Tl、 Τ2和一个存储电容 C1的驱动电路中（参 照图 1 所示） ， 其中驱动电流 /。£βΰ是由于数据线提供的电压 作用 在驱动晶体管（DTFT)饱和区域而产生的电流。 该电流驱动 OLED 以发 光， 其中驱动电流计算公式为/。^ = ^ (^ - )2 , 其中 为驱动晶体管 栅极和源极之间的电压， 为驱动晶体管的阈值电压。 由于工艺制程 和器件老化等原因， 各像素点的驱动 TFT的阈值电压（ί¾)存在不均匀 性， 各像素点的驱动 TFT (即图中 Τ2 ) 的阈值电压存在不均匀性， 这 样就导致了流过每个像素点 OLED 的电流发生变化， 从而影响整个图 像的显示效果。 发明内容
本发明的实施例提供一种像素驱动电路及其驱动方法和显示装 置， 能够避免驱动晶体管的阈值电压漂移对有源发光器件驱动电流的 影响， 进而提高了显示图像的均匀性。
为达到上述目的， 本发明的实施例采用如下技术方案： 一方面， 提供了一种像素驱动电路， 包括发光器件、 存储电容、 驱动单元和五个开关单元；
其中， 每个开关单元包括控制端、 第一信号端和第二信号端； 其 中开关单元的控制端用于输入控制信号从而将所述第一信号端和第二 信号端导通或关断； 驱动单元包括控制端、 信号输入端和驱动端， 所 述驱动单元的控制端和信号输入端用于控制在驱动端输出驱动信号； 第一开关单元的控制端用于输入复位信号， 所述第一开关单元的 第一信号端用于输入初始化电平；
第二开关单元的控制端用于输入第一扫描信号， 第二开关单元的 第一信号端连接所述第一开关单元的第二信号端；
存储电容的第一极连接所述第二开关单元的第一信号端； 第三开关单元的控制端用于输入第二扫描信号， 第三开关单元的 第一信号端用于输入数据信号， 第三开关单元的第二信号端连接所述 存储电容的第二极；
第四开关单元的控制端用于输入第三扫描信号， 所述第四开关单 元第一信号端用于输入第一电平， 第四开关单元的第二信号端连接所 述存储电容的第二极；
第五开关单元的控制端用于输入第四扫描信号， 所述第五开关单 元的第一信号端连接所述第二开关单元的第二信号端；
驱动单元的控制端连接所述存储电容的第一极， 驱动单元的信号 输入端用于输入所述第一电平， 驱动单元的驱动端连接所述第五开关 单元的第一信号端；
发光器件的第一极连接所述第五开关单元的第二信号端， 发光器 件的第二极输入第二电平。
可选的， 所有扫描信号均通过扫描线输入对应的开关单元的控制 端。
可选的， 所述第五开关单元的控制端和所述第四开关单元的控制 端分别连接不同的扫描线， 并且所述第三扫描信号和所述第四扫描信 号不同步。
可选的， 第二开关单元的控制端和第三开关单元的控制端连接相 同的扫描线。
可选的， 所述开关单元为开关晶体管， 所述开关晶体管的栅极用 作所述开关单元的控制端， 所述开关晶体管的源极和漏极分别用作所 述开关单元的第一信号端和第二信号端， 或者， 所述开关晶体管的源 极和漏极分别用作所述开关单元的第二信号端和第一信号端。
可选的， 所述驱动单元为驱动晶体管， 所述驱动晶体管的栅极用 作所述驱动单元的控制端， 所述驱动晶体管的源极用作所述驱动单元 的信号输入端， 所述驱动晶体管的漏极用作所述驱动单元的驱动端。
另一方面， 提供了一种像素电路的驱动方法， 包括：
第一阶段， 第一开关单元的第一信号端和第二信号端导通， 第四 开关单元的第一信号端和第二信号端导通， 初始化电平和第一电平为 存储电容充电；
第二阶段， 第二开关单元的第一信号端和第二信号端导通， 第三 开关单元的第一信号端和第二信号端导通， 数据信号写入存储电容的 第二极， 存储电容的第一极放电直至驱动单元的控制端和信号输入端 的电压差等于驱动单元的阈值电压；
第三阶段， 第四开关单元的第一信号端和第二信号端导通， 第五 开关单元的第一信号端和第二信号端导通， 第一电平耦合提升所述存 储电容第一极的电位， 驱动单元在所述存储电容第一极输出电压的控 制下在驱动端输出驱动信号驱动发光器件发光。
可选的， 所述开关单元为开关晶体管时， 包括截止状态和导通状 太
可选的， 所述驱动单元为驱动晶体管时， 在所述第三阶段， 所述 驱动晶体管处于饱和状态。
又一方面， 提供了一种显示装置， 包括上述任一项所述的像素驱 动电路。
本发明的实施例提供一种像素驱动电路及其驱动方法和显示装 置， 能够通过电压补偿的方式避免驱动晶体管的阈值电压漂移对有源 发光器件驱动电流的影响， 进而提高了显示图像的均匀性。 附图说明 将对实施例或现有技术描述中所需要使用的附图作简单地介绍， 显而 易见地， 下面描述中的附图仅仅是本发明的一些实施例， 对于本领域 普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些 附图获得其他的附图。
图 1为现有技术的一种像素驱动电路结构示意图；
图 2为本发明实施例提供的一种像素驱动电路结构示意图； 图 3为本发明另一实施例提供的一种像素驱动电路结构示意图； 图 4 为本发明另一实施例提供的像素驱动电路的输入信号时序状 态示意图；
图 5a为本发明实施例提供的像素驱动电路在第一阶段的等效电路 示意图；
图 5b为本发明实施例提供的像素驱动电路在第二阶段的等效电路 示意图；
图 5c为本发明实施例提供的像素驱动电路在第三阶段的等效电路 示意图。 具体实施方式
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方 案进行清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部 分实施例， 而不是全部的实施例。 基于本发明中的实施例， 本领域普 通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
本发明所有实施例中采用的开关晶体管和驱动晶体管均可以为薄 膜晶体管或场效应管或其他特性相同的器件， 由于这里采用的开关晶 体管的源极、 漏极是对称的， 所以其源极、 漏极是可以互换的。 在本 发明实施例中， 为区分晶体管除栅极之外的两极， 将其中一极称为源 极， 另一极称为漏极。 按附图中的形态规定晶体管的中间端为栅极、 信号输入端为源极、 信号输出端为漏极。 此外， 本发明实施例所采用 的开关晶体管包括 P型开关晶体管和 N型开关晶体管两种， 其中， P 型开关晶体管在栅极为低电平时导通， 在栅极为高电平时截止， N 型 开关晶体管为在栅极为高电平时导通， 在栅极为低电平时截止； 本发 明实施例所采用的驱动晶体管包括 P型和 N型， 其中 P型驱动晶体管 在栅极电压为低电平 （栅极电压小于源极电压） ， 且栅极源极的压差 的绝对值大于阈值电压时处于放大状态或饱和状态； 其中 N型驱动晶 体管的栅极电压为高电平 （栅极电压大于源极电压） , 且栅极源极的 压差的绝对值大于阈值电压时处于放大状态或饱和状态。
参照图 2 ,为本发明实施例提供的一种像素驱动电路，其特征在于， 包括发光器件、 存储电容、 驱动单元和五个开关单元；
其中， 每个开关单元包括控制端、 第一信号端和第二信号端； 其 中开关单元的控制端用于输入控制信号从而将所述第一信号端和第二 信号端导通或关断； 驱动单元包括控制端、 信号输入端和驱动端， 所 述驱动单元的控制端和信号输入端用于控制在驱动端输出驱动信号； 第一开关单元的控制端用于输入复位信号， 所述第一开关单元的 第一信号端用于输入初始化电平；
第二开关单元的控制端用于输入第一扫描信号， 第二开关单元的 第一信号端连接所述第一开关单元的第二信号端；
存储电容的第一极连接所述第二开关单元的第一信号端；
第三开关单元的控制端用于输入第二扫描信号， 第三开关单元的 第一信号端用于输入数据信号， 第三开关单元的第二信号端连接所述 存储电容的第二极；
第四开关单元的控制端用于输入第三扫描信号， 所述第四开关单 元第一信号端用于输入第一电平， 第四开关单元的第二信号端连接所 述存储电容的第二极；
第五开关单元的控制端用于输入第四扫描信号， 所述第五开关单 元的第一信号端连接所述第二开关单元的第二信号端；
驱动单元的控制端连接所述存储电容的第一极， 驱动单元的信号 输入端用于输入所述第一电平， 驱动单元的驱动端连接所述第五开关 单元的第一信号端；
发光器件的第一极连接所述第五开关单元的第二信号端， 发光器 件的第二极输入第二电平。
可选的， 所有扫描信号均通过扫描线输入对应的开关单元的控制 端。 第二开关单元的控制端和第三开关单元的控制端连接相同的扫描 线。 可以理解的是， 连接相同的扫描线使得多个开关单元的控制端输 入相同时序的扫描信号。
需要说明的是， 附图 2 中， 以数字 1、 2、 3 的形式标记各个开关 单元和驱动单元的端子， 其中每个开关单元的控制端为端子 3、 第一信 号端为端子 1、 第二信号端为端子 2; 驱动单元的控制端为端子 3 , 信 号输入端为端子 1且驱动端为端子 2。
本发明的实施例提供的像素驱动电路， 能够通过电压补偿的方式 避免驱动晶体管的阈值电压漂移对有源发光器件驱动电流的影响， 进 而提高了显示图像的均匀性。
本发明的实施例还提供了用于上述像素驱动电路的驱动方法， 包 括：
第一阶段， 第一开关单元的第一信号端和第二信号端导通， 第四 开关单元的第一信号端和第二信号端导通， 初始化电平和第一电平为 存储电容充电；
第二阶段， 第二开关单元的第一信号端和第二信号端导通， 第三 开关单元的第一信号端和第二信号端导通， 数据信号写入存储电容的 第二极， 存储电容的第一极放电直至驱动单元的控制端和信号输入端 的电压差等于驱动单元的阈值电压；
第三阶段， 第四开关单元的第一信号端和第二信号端导通， 第五 开关单元的第一信号端和第二信号端导通， 第一电平耦合提升所述存 储电容第一极的电位， 驱动单元在所述存储电容第一极输出电压的控 制下在驱动端输出驱动信号驱动发光器件发光。
可以理解的是， 每个开关单元的默认状态为： 开关单元的第一信 号端和第二信号端处于关断状态。 在上述方法流程中只是指出了每个 阶段中开关单元的第一信号端和第二信号端切换为导通状态， 因此在 每个阶段中， 除了第一信号端和第二信号端已导通的开关单元外， 认 为其他开关单元的第一信号端和第二信号端均处于关断状态。
本发明的实施例提供的像素驱动电路的驱动方法， 能够通过电压 补偿的方式避免驱动晶体管的阈值电压漂移对有源发光器件驱动电流 的影响， 进而提高了显示图像的均匀性。
进一步可选的， 第五开关单元的控制端和所述第四开关单元的控 制端分别连接不同的扫描线， 并且所述第三扫描信号和所述第四扫描 信号不同步。 参照上述像素驱动电路的驱动方法， 可知第四开关单元 的第一信号端和第二信号端的导通时序与第五开关单元的第一信号端 和第二信号端的导通时序并不完全同步， 通过第五开关单元的控制端 和所述第四开关单元的控制端分别连接不同的扫描线的设计以实现输 入的第三扫描信号和所述第四扫描信号不同步， 从而实现了第四开关 单元和第五开关单元的单独控制， 进而实现了像素显示时间的精确控 制， 同时保证了发光器件稳定性， 避免发光器件的在非发光阶段有电 流通过， 延长了器件的使用寿命。
具体的， 以开关单元为开关晶体管、 驱动单元为驱动晶体管为例 进行说明。 基于上述的开关晶体管和驱动晶体管的物理特性可知， 开 关晶体管的栅极用作所述开关单元的控制端， 所述开关晶体管的源极 和漏极分别用作所述开关单元的第一信号端和第二信号端， 或者， 所 述开关晶体管的源极和漏极分别用作所述开关单元的第二信号端和第 一信号端； 所述驱动晶体管的栅极用作所述驱动单元的控制端， 所述 驱动晶体管的源极用作所述驱动单元的信号输入端， 所述驱动晶体管 的漏极用作所述驱动单元的驱动端。 参照图 3 所示， 提供了一种像素 驱动电路， 包括五个开关晶体管 （以 T1-T5 顺序标注） 及一个驱动晶 体管 DTFT和一个存储电容 C1 , 其中存储电容包括第一极 （连接节点 A )和第二极（连接节点 B ) 。 该电路中所有晶体管均采用 P型晶体管 为例进行说明，其中第一电平为高电平 VDD, 第二电平为低电平 VSS , 第一扫描线 Gate为 T2和 T3提供扫描信号，第二扫描线 EM1为 T5提 供扫描信号， 第三扫描线 EM2为 T4提供扫描信号， 数据线 Data为 T3 的源极提供数据信号， Vinit为复位信号 Reset输入时提供的初始化电 平， VDD和 VSS为发光器件提供电源。
T1的栅极输入 Reset, T1的源极输入 Vinit, T1的漏极连接节点 A; T2的栅极连接 Gate, T2的源极连接节点 A, T2的漏极连接 DTFT的 漏极； T3的源极连接 Data, T3的栅极连接 Gate, T3的漏极连接节点 B; T4的源极输入 VDD, T4的栅极连接 EM2 , T4的漏极连接节点 B; T5的栅极连接 EMI , T5的源极连接 DTFT的漏极， T5的漏极连接发 光器件的第一极， 发光器件的第二极输入 VSS; DTFT的栅极连接节点 A , DTFT的源极输入 VDD。
其中，发光器件可以为有源发光二极管 OLED, 由于第一电平为高 电平、 第二电平为低电平， 该 OLED为底发射型 OLED, 优选的， VSS 为接地。
结合图 3所示的像素驱动电路， 参照图 4提供的像素驱动电路各 输入信号的信号时序状态示意图， 同时参照图 5a〜5c 所提供的像素驱 动电路的各个阶段工作状态的等效电路示意图， 对电路的具体工作原 理说明如下：
第一阶段 tl为像素初始化阶段：
该阶段 EM1输入高电位， EM2 和 Reset 同时输入低电位， Tl、 Τ4导通， 此时的等效电路参照图 5(a)所示。 电容 C1 两端的 Α点的电 位 Va=Vinit和 B点的电位 Vb=VDD。
第二阶段 t2为数据写入阶段：
EM1、 EM2、 Reset同时输入高电位， Gate输入低电位， 数据信号 通过 Data数据线写入 Vdata, T2、 Τ3导通，此时的等效电路参照图 5(b) 所示。 此时由于 Τ2导通， DTFT的栅极和漏极短路， 因此 DTFT处于 二极管状态。 此时 DTFT漏极电压为 VDD+Vth, C1 电容两端的 A点 的电位为 Va= VDD+Vth, B点的电位 Vb= Vdata, 其中 Vth为 DTFT的 阈值电压。
第三阶段 t3为发光阶段：
EM1和 EM2 同时输入低电平， T4、 Τ5导通， 此时的等效电路参 照图 5(c)所示。 此时 Β点电位变为 VDD；
才艮据电荷保持定理， Α点电位提高至 Va=2VDD+Vth-Vdata;
此时 Vra =Va-VDD=2 VDD+Vth- Vdata -VDD= VDD+Vth- Vdata。 由于 DTFT处于饱和状态， 其输出电流为：
IOLED =丄?[Vra - Vth]2 = i ?[VDD + Vth - Vdata - Vth]2 =丄?[VDD - Vdata]2 由以上公式可知驱动电流 /。 ^只和数据线电压 Vdata 值有关系，因 此驱动电流不受 Vth影响， 其中， ^为 TFT栅极和源极之间的电压， P = C。 ^ , μ、 C∞为工艺常数， 为 TFT 沟道宽度， J为薄膜晶体管 的沟道长度， W、 J都为可选择性设计的常数。 此时像素 OLED上的电 流与 Vth无关。
以上实施例以开关晶体管、 驱动晶体管为 "P" 型晶体管为例进行 说明， 当然， 简单更换晶体管的类型时只需要相应的调整相应的扫描 信号线输入的时序状态即可。 本发明实施例对提供的各个开关晶体管 和驱动晶体管的类型不做限制。 当各个开关晶体管和驱动晶体管的类 型采取变化时， 只需调整晶体管栅极施加的电平信号即可， 这里以能 够实现本发明实施例提供的像素电路的驱动方法为准。 本领域技术人 员在本发明实施例提供的像素驱动电路和驱动方法的基础上可轻易想 到并实现的任意组合均在本发明的保护范围内。
本发明实施例提供的像素驱动电路能够通过电压补偿的方式避免 驱动晶体管的阈值电压漂移对有源发光器件驱动电流的影响， 提高了 显示图像的均匀性。
本发明的实施例还提供了一种显示装置， 包括： 上述的像素驱动 电路。 该显示装置可以为电子纸、 手机、 电视、 数码相框等等显示设 备。
本发明实施例提供的显示装置， 能够通过电压补偿的方式避免驱 动晶体管的阈值电压漂移对有源发光器件驱动电流的影响， 进而提高 了显示图像的均匀性。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并 围内， 可轻易想到变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围应以所述权利要求的保护范围为准。

Claims

权 利 要 求
1. 一种像素驱动电路， 其特征在于， 包括发光器件、 存储电容、 驱动单元和五个开关单元；
其中， 每个开关单元包括控制端、 第一信号端和第二信号端； 其 中开关单元的控制端用于输入控制信号从而将所述第一信号端和第二 信号端导通或关断； 驱动单元包括控制端、 信号输入端和驱动端， 所 述驱动单元的控制端和信号输入端用于控制在驱动端输出驱动信号； 第一开关单元的控制端用于输入复位信号， 所述第一开关单元的 第一信号端用于输入初始化电平；
第二开关单元的控制端用于输入第一扫描信号， 第二开关单元的 第一信号端连接所述第一开关单元的第二信号端；
存储电容的第一极连接所述第二开关单元的第一信号端； 第三开关单元的控制端用于输入第二扫描信号， 第三开关单元的 第一信号端用于输入数据信号， 第三开关单元的第二信号端连接所述 存储电容的第二极；
第四开关单元的控制端用于输入第三扫描信号， 所述第四开关单 元第一信号端用于输入第一电平， 第四开关单元的第二信号端连接所 述存储电容的第二极；
第五开关单元的控制端用于输入第四扫描信号， 所述第五开关单 元的第一信号端连接所述第二开关单元的第二信号端；
驱动单元的控制端连接所述存储电容的第一极， 驱动单元的信号 输入端用于输入所述第一电平， 驱动单元的驱动端连接所述第五开关 单元的第一信号端；
发光器件的第一极连接所述第五开关单元的第二信号端， 发光器 件的第二极输入第二电平。
2. 根据权利要求 1所述的像素驱动电路， 其特征在于， 所有扫描 信号均通过扫描线输入对应的开关单元的控制端。
3. 根据权利要求 2所述的像素驱动电路， 其特征在于， 第二开关 单元的控制端和第三开关单元的控制端连接相同的扫描线。
4. 根据权利要求 2所述的像素驱动电路， 其特征在于， 所述第五 开关单元的控制端和所述第四开关单元的控制端分别连接不同的扫描 线， 并且所述第三扫描信号和所述第四扫描信号不同步。
5. 根据权利要求 1所述的像素驱动电路， 其特征在于， 所述开关 单元为开关晶体管， 所述开关晶体管的栅极用作所述开关单元的控制 端， 所述开关晶体管的源极和漏极分别用作所述开关单元的第一信号 端和第二信号端， 或者， 所述开关晶体管的源极和漏极分别用作所述 开关单元的第二信号端和第一信号端。
6. 根据权利要求 1所述的像素驱动电路， 其特征在于， 所述驱动 单元为驱动晶体管， 所述驱动晶体管的栅极用作所述驱动单元的控制 端， 所述驱动晶体管的源极用作所述驱动单元的信号输入端， 所述驱 动晶体管的漏极用作所述驱动单元的驱动端。
7. 一种用于如权利要求 1-6任一项所述的像素驱动电路的驱动方 法， 其特征在于， 包括：
第一阶段， 第一开关单元的第一信号端和第二信号端导通， 第四 开关单元的第一信号端和第二信号端导通， 初始化电平和第一电平为 存储电容充电；
第二阶段， 第二开关单元的第一信号端和第二信号端导通， 第三 开关单元的第一信号端和第二信号端导通， 数据信号写入存储电容的 第二极， 存储电容的第一极放电直至驱动单元的控制端和信号输入端 的电压差等于驱动单元的阈值电压；
第三阶段， 第四开关单元的第一信号端和第二信号端导通， 第五 开关单元的第一信号端和第二信号端导通， 第一电平耦合提升所述存 储电容第一极的电位， 驱动单元在所述存储电容第一极输出电压的控 制下在驱动端输出驱动信号驱动发光器件发光。
8. 根据权利要求 7所述的方法， 其特征在于， 所述开关单元为开 关晶体管时， 开关晶体管包括截止状态和导通状态。
9. 根据权利要求 7所述的方法， 其特征在于， 所述驱动单元为驱 动晶体管时， 在所述第三阶段， 所述驱动晶体管处于饱和状态。
10. 一种显示装置， 其特征在于， 包括权利要求 1-6任一项所述的 像素驱动电路。
PCT/CN2014/084631 2014-05-07 2014-08-18 一种像素驱动电路及其驱动方法和显示装置 WO2015169006A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US14/442,391 US9886898B2 (en) 2014-05-07 2014-08-18 Pixel driving circuit, driving method for pixel driving circuit and display device
EP14861171.8A EP3142100B1 (en) 2014-05-07 2014-08-18 Pixel drive circuit and drive method therefor, and display device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410190523.7 2014-05-07
CN201410190523.7A CN103971640B (zh) 2014-05-07 2014-05-07 一种像素驱动电路及其驱动方法和显示装置

Publications (1)

Publication Number Publication Date
WO2015169006A1 true WO2015169006A1 (zh) 2015-11-12

Family

ID=51241063

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2014/084631 WO2015169006A1 (zh) 2014-05-07 2014-08-18 一种像素驱动电路及其驱动方法和显示装置

Country Status (4)

Country Link
US (1) US9886898B2 (zh)
EP (1) EP3142100B1 (zh)
CN (1) CN103971640B (zh)
WO (1) WO2015169006A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109119024A (zh) * 2018-08-28 2019-01-01 武汉天马微电子有限公司 一种驱动电路、驱动方法、显示面板和显示装置

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103971640B (zh) 2014-05-07 2016-08-24 京东方科技集团股份有限公司 一种像素驱动电路及其驱动方法和显示装置
CN104240639B (zh) 2014-08-22 2016-07-06 京东方科技集团股份有限公司 一种像素电路、有机电致发光显示面板及显示装置
CN104464616B (zh) * 2014-10-28 2017-10-03 上海天马有机发光显示技术有限公司 像素电路及其驱动方法、显示面板
CN104464643B (zh) * 2014-12-29 2017-05-03 上海和辉光电有限公司 显示装置、像素驱动电路及其驱动方法
CN104575389A (zh) * 2015-01-29 2015-04-29 京东方科技集团股份有限公司 像素电路及其驱动方法、显示面板及显示装置
CN104599638A (zh) * 2015-02-12 2015-05-06 京东方科技集团股份有限公司 一种像素电路及其驱动方法和显示装置
CN104658480A (zh) * 2015-03-06 2015-05-27 京东方科技集团股份有限公司 像素电路及其驱动方法、显示装置
CN104658484B (zh) * 2015-03-18 2018-01-16 上海和辉光电有限公司 显示装置、像素驱动电路及其驱动方法
KR102652310B1 (ko) * 2016-08-30 2024-03-29 엘지디스플레이 주식회사 유기발광표시장치, 컨트롤러 및 컨트롤러의 구동 방법
US10789891B2 (en) 2016-09-19 2020-09-29 Boe Technology Group Co., Ltd. Pixel circuit, driving method thereof, display substrate and display apparatus
CN106128366B (zh) * 2016-09-19 2018-10-30 成都京东方光电科技有限公司 像素驱动电路及其驱动方法和显示装置
CN106128365B (zh) 2016-09-19 2018-09-18 成都京东方光电科技有限公司 像素驱动电路及其驱动方法和显示装置
CN106409227A (zh) * 2016-12-02 2017-02-15 武汉华星光电技术有限公司 像素电路及其驱动方法和有机发光显示器
CN107346654B (zh) * 2017-08-29 2023-11-28 京东方科技集团股份有限公司 一种像素电路及其驱动方法、显示装置
CN107846559B (zh) * 2017-10-09 2021-06-15 上海集成电路研发中心有限公司 一种高动态范围的图像传感器结构及其驱动方法
CN107886901B (zh) * 2017-12-04 2019-10-18 合肥鑫晟光电科技有限公司 像素驱动电路、显示面板及其驱动方法
WO2019180759A1 (ja) * 2018-03-19 2019-09-26 シャープ株式会社 表示装置およびその駆動方法
CN110021259B (zh) 2018-03-23 2020-12-22 京东方科技集团股份有限公司 电源电压提供电路、方法、显示基板和显示装置
CN109036288B (zh) * 2018-09-28 2020-09-22 昆山国显光电有限公司 像素电路及其控制方法
CN109192143A (zh) * 2018-09-28 2019-01-11 昆山国显光电有限公司 像素电路及其驱动方法、显示面板、显示装置
CN109872682A (zh) * 2019-03-28 2019-06-11 武汉华星光电半导体显示技术有限公司 像素补偿电路及显示装置
CN110738964A (zh) * 2019-10-29 2020-01-31 京东方科技集团股份有限公司 像素电路及显示装置
TWI731462B (zh) * 2019-11-05 2021-06-21 友達光電股份有限公司 畫素電路、畫素結構與相關的畫素矩陣
WO2021102906A1 (zh) * 2019-11-29 2021-06-03 京东方科技集团股份有限公司 像素驱动电路及其驱动方法和显示装置
CN111754941B (zh) * 2020-07-29 2022-04-15 京东方科技集团股份有限公司 像素电路及其驱动方法、显示基板和显示装置
US11751450B2 (en) 2020-08-31 2023-09-05 Chengdu Boe Optoelectronics Technology Co., Ltd. Display panel and display device
CN115398523A (zh) 2021-01-27 2022-11-25 京东方科技集团股份有限公司 像素驱动电路及其驱动方法、显示基板、显示装置
CN112509523B (zh) 2021-02-04 2021-05-25 上海视涯技术有限公司 一种显示面板、驱动方法及显示装置
TWI801080B (zh) * 2022-01-05 2023-05-01 友達光電股份有限公司 畫素驅動裝置
CN114639347A (zh) * 2022-04-27 2022-06-17 惠科股份有限公司 像素驱动电路、驱动方法及显示装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040070557A1 (en) * 2002-10-11 2004-04-15 Mitsuru Asano Active-matrix display device and method of driving the same
CN101405785A (zh) * 2006-05-30 2009-04-08 夏普株式会社 电流驱动型显示装置
US20100073266A1 (en) * 2008-09-19 2010-03-25 Samsung Electronics Co., Ltd. Display device and method of driving the same
US20110134100A1 (en) * 2009-12-08 2011-06-09 Bo-Yong Chung Pixel circuit and organic electro-luminescent display apparatus
CN103117041A (zh) * 2013-01-31 2013-05-22 华南理工大学 有源有机电致发光显示器的像素电路及其编程方法
CN103971640A (zh) * 2014-05-07 2014-08-06 京东方科技集团股份有限公司 一种像素驱动电路及其驱动方法和显示装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI276029B (en) * 2005-11-28 2007-03-11 Chi Mei El Corp Organic light-emitting display and voltage-driven organic light-emitting pixel
KR100846591B1 (ko) * 2006-12-01 2008-07-16 삼성에스디아이 주식회사 유기전계발광 표시장치 및 이의 구동방법
KR101404549B1 (ko) * 2008-02-15 2014-06-10 삼성디스플레이 주식회사 표시 장치 및 그 구동 방법
TWI488348B (zh) * 2012-05-24 2015-06-11 Au Optronics Corp 發光二極體顯示器之畫素電路及其驅動方法與發光二極體顯示器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040070557A1 (en) * 2002-10-11 2004-04-15 Mitsuru Asano Active-matrix display device and method of driving the same
CN101405785A (zh) * 2006-05-30 2009-04-08 夏普株式会社 电流驱动型显示装置
US20100073266A1 (en) * 2008-09-19 2010-03-25 Samsung Electronics Co., Ltd. Display device and method of driving the same
US20110134100A1 (en) * 2009-12-08 2011-06-09 Bo-Yong Chung Pixel circuit and organic electro-luminescent display apparatus
CN103117041A (zh) * 2013-01-31 2013-05-22 华南理工大学 有源有机电致发光显示器的像素电路及其编程方法
CN103971640A (zh) * 2014-05-07 2014-08-06 京东方科技集团股份有限公司 一种像素驱动电路及其驱动方法和显示装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3142100A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109119024A (zh) * 2018-08-28 2019-01-01 武汉天马微电子有限公司 一种驱动电路、驱动方法、显示面板和显示装置

Also Published As

Publication number Publication date
EP3142100A1 (en) 2017-03-15
EP3142100A4 (en) 2017-11-08
CN103971640B (zh) 2016-08-24
US20170047002A1 (en) 2017-02-16
CN103971640A (zh) 2014-08-06
EP3142100B1 (en) 2022-11-09
US9886898B2 (en) 2018-02-06

Similar Documents

Publication Publication Date Title
WO2015169006A1 (zh) 一种像素驱动电路及其驱动方法和显示装置
WO2016187990A1 (zh) 像素电路以及像素电路的驱动方法
WO2017031909A1 (zh) 像素电路及其驱动方法、阵列基板、显示面板及显示装置
WO2020062802A1 (zh) 显示面板及像素电路的驱动方法
WO2018095031A1 (zh) 像素电路及其驱动方法、以及显示面板
WO2017041453A1 (zh) 像素电路、其驱动方法及相关装置
WO2018076719A1 (zh) 像素驱动电路及其驱动方法、显示面板和显示装置
WO2016161866A1 (zh) 像素电路及其驱动方法、显示装置
JP7084314B2 (ja) 画素回路に用いる駆動方法
WO2016023311A1 (zh) 像素驱动电路及其驱动方法和显示装置
WO2016188012A1 (zh) 像素电路、其驱动方法及显示装置
US9595227B2 (en) Pixel circuit and driving method thereof, organic light emitting display panel and display apparatus
WO2016011711A1 (zh) 像素电路、像素电路的驱动方法和显示装置
WO2016074359A1 (zh) 像素电路、有机电致发光显示面板、显示装置及其驱动方法
WO2018000982A1 (zh) 像素电路及驱动方法和显示设备
WO2016101504A1 (zh) 一种像素电路、有机电致发光显示面板及显示装置
WO2020192278A1 (zh) 像素电路及其驱动方法、显示基板、显示装置
WO2015169015A1 (zh) 像素驱动电路、驱动方法、阵列基板及显示装置
WO2015180352A1 (zh) 像素电路及其驱动方法、有机发光显示面板及显示装置
WO2016155161A1 (zh) Oeld像素电路、显示装置及控制方法
WO2015085699A1 (zh) Oled像素电路及驱动方法、显示装置
WO2015188533A1 (zh) 像素驱动电路、驱动方法、阵列基板及显示装置
WO2014153806A1 (zh) 像素电路及其驱动方法、显示装置
WO2015127760A1 (zh) 像素电路及其驱动方法、显示面板和显示装置
WO2014169537A1 (zh) 像素电路、像素电路驱动方法及显示装置

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 14442391

Country of ref document: US

REEP Request for entry into the european phase

Ref document number: 2014861171

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2014861171

Country of ref document: EP

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14861171

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE