WO2016169335A1 - 像素驱动电路及驱动方法、移位寄存器、显示面板和装置 - Google Patents

像素驱动电路及驱动方法、移位寄存器、显示面板和装置 Download PDF

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Publication number
WO2016169335A1
WO2016169335A1 PCT/CN2016/075109 CN2016075109W WO2016169335A1 WO 2016169335 A1 WO2016169335 A1 WO 2016169335A1 CN 2016075109 W CN2016075109 W CN 2016075109W WO 2016169335 A1 WO2016169335 A1 WO 2016169335A1
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Prior art keywords
oled
transistor
driving circuit
pixel driving
row
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PCT/CN2016/075109
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English (en)
French (fr)
Inventor
陈鹏
张新霞
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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Priority to US15/511,651 priority Critical patent/US9990887B2/en
Publication of WO2016169335A1 publication Critical patent/WO2016169335A1/zh
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—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]
    • G09G3/3225—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]
    • G09G3/3266—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]
    • G09G3/3275—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
    • G09G2300/0426—Layout of electrodes and connections
    • 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
    • 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0286—Details of a shift registers arranged for use in a driving circuit
    • 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

  • the present disclosure relates to the field of display technologies, and in particular, to a pixel driving circuit and a driving method, a shift register, a display panel, and a device.
  • OLED Organic Light-Emitting Diode
  • advantages include, for example, a backlight board, a wide viewing angle, uniform image quality, fast response speed, easy colorization, and simple driving circuit.
  • Light-emitting, simple process can be made into a flexible panel, in line with the principle of light and thin, so the application range of OLED covers all sizes of panels.
  • OLED organic light emitting diode
  • the main purpose of the present disclosure is to provide a pixel driving circuit and a driving method, a shift register, a display panel, and a device, so as to solve the problem that the pixel driving circuit optimized for aging of the OLED device itself does not exist in the related art, thereby resulting in short life of the OLED device.
  • the problem is to provide a pixel driving circuit and a driving method, a shift register, a display panel, and a device.
  • the present disclosure provides a pixel driving circuit for driving an organic light emitting diode (OLED) including a driving transistor, a storage capacitor, and a data writing unit; wherein a gate of the driving transistor is written by the data Input unit access data voltage, the drive transistor a first pole is connected to a cathode of the OLED, and a second pole of the driving transistor is grounded; the storage capacitor is connected between a gate of the driving transistor and a first pole of the driving transistor; the OLED The anode is connected to the driving voltage; the data writing unit is connected to the nth row of scanning signals for writing the data voltage to the gate of the driving transistor when the nth row of scanning signals is valid;
  • OLED organic light emitting diode
  • the pixel driving circuit further includes:
  • a reverse control unit connected to the n-2th scan signal, and connected to the cathode of the OLED, for controlling the cathode of the OLED to access the first when the n-2th scan signal is valid N-2 rows of scan signals; the voltage of the n-2th scan signal is greater than the drive voltage, and n is an integer greater than 2.
  • the reverse control unit includes: a reverse control transistor, wherein a gate and a first pole of the reverse control transistor are connected to the n-2th row scan signal, and the reverse control transistor A second pole is coupled to the cathode of the OLED.
  • the pixel driving circuit of the present disclosure further includes:
  • control unit accessing the scan signal of the n-1th row, and respectively connecting with the anode of the OLED and the cathode of the OLED, for controlling the conduction when the scan signal of the n-1th line is valid
  • the shutdown control unit includes:
  • a gate of the turn-off control transistor is connected to the n-1th row scan signal
  • a first pole of the turn-off control transistor is connected to an anode of the OLED
  • the turn-off A second pole of the control transistor is coupled to the cathode of the OLED.
  • the data writing unit includes:
  • a data write transistor wherein a gate of the data write transistor is coupled to an nth row of scan signals, a first pole of the data write transistor is coupled to a data voltage, and the data is written to a second pole of the transistor
  • the gates of the drive transistors are connected.
  • the present disclosure also provides a driving method of a pixel driving circuit for driving the above pixel driving circuit, and the driving method includes:
  • the voltage of the n-2th row scanning signal is greater than the driving voltage, and n is greater than 2 Whole Number;
  • the data write unit controls writing the data voltage to the gate of the drive transistor.
  • the driving method of the present disclosure further includes:
  • the turn-off control unit controls the connection between the anode of the OLED and the cathode of the OLED when the scan signal of the n-1th row is active.
  • the present disclosure also provides a shift register comprising N stages of the above pixel driving circuit, N being an integer greater than 2;
  • the nth stage pixel driving circuit respectively accesses the nth row scanning signal and the n-2th row scanning signal, and n is an integer greater than 2 and less than or equal to N.
  • the nth stage pixel driving circuit also accesses the n-1th row scanning signal.
  • the present disclosure also provides a display panel including the shift register described above.
  • the present disclosure also provides a display device including the above display panel.
  • the pixel driving circuit and the driving method, the shift register, the display panel and the device of the present disclosure load a reverse voltage difference across the OLED at the last moment of the display of one frame, which can prevent the OLED device from being Aging, the effect of extending the life of the OLED.
  • FIG. 1 is a structural diagram of a pixel driving circuit according to an embodiment of the present disclosure
  • FIG. 2 is a structural diagram of a pixel driving circuit according to another embodiment of the present disclosure.
  • FIG. 3 is a circuit diagram of a pixel driving circuit according to still another embodiment of the present disclosure.
  • FIG. 4 is a structural diagram of a pixel driving circuit according to still another embodiment of the present disclosure.
  • FIG. 5 is a circuit diagram of a pixel driving circuit according to an embodiment of the present disclosure.
  • the present disclosure of the present disclosure may be a thin film transistor or a field effect transistor or other device having the same characteristics.
  • one of the poles is referred to as a first pole
  • the other pole is referred to as a second pole
  • the first pole may be a source or a drain
  • the pole, and correspondingly the second pole can be the drain or the source.
  • the transistor can be classified into an n-type transistor or a p-type transistor according to the characteristics of the transistor.
  • a pixel driving circuit is configured to drive a light emitting diode OLED, including a driving transistor M1, a storage capacitor Cs, and a data writing unit 10;
  • the driving transistor M1 For the driving transistor M1, its gate is connected to the data voltage Vdata through the data writing unit 10, its first pole is connected to the cathode of the OLED, and its second pole is connected to the ground GND;
  • the storage capacitor Cs is connected between the gate of the driving transistor M1 and the first pole of the driving transistor M1;
  • the anode of the OLED is connected to a driving voltage Vdd;
  • the data writing unit 10 accesses the nth row of scanning signals Vscan(n) for the nth Writing the data voltage Vdata to the gate of the driving transistor M1 when the row scan signal Vscan(n) is active;
  • the pixel driving circuit further includes:
  • the reverse control unit 11 accesses the n-2th row scan signal Vscan(n-2) and is connected to the cathode of the OLED for being effective in the n-2th row scan signal Vscan(n-2) Controlling the cathode of the OLED to access the n-2th row scan signal Vscan(n-2) such that a reverse voltage difference is applied across the OLED; the n-2th row scan signal Vscan(n)
  • the voltage of -2) is greater than the driving voltage Vdd, and n is an integer greater than 2.
  • the driving transistor M1 is an n-type thin film transistor (TFT). In actual operation, the driving transistor M1 may also be replaced with a p-type TFT.
  • TFT thin film transistor
  • the type change of the transistor is well known to those skilled in the art and will not be described herein.
  • the pixel driving circuit of the embodiment shown in FIG. 1 adopts a reverse control unit to control the reverse voltage difference at both ends of the OLED at the last moment of the display of one frame, and the OLED is turned off and does not emit light.
  • the aging of the OLED device itself can be optimized by using the existing scanning signal without adding a new control signal, delaying the brightness decay of the OLED, and prolonging the life of the OLED.
  • the reverse control unit 11 may include: a reverse control transistor M2, wherein the gate and the first pole of the reverse control transistor M2 are connected to the n-2th line scan a signal Vscan(n-2), and a second pole of the reverse control transistor M2 is coupled to a cathode of the OLED;
  • the reverse control transistor M2 is an n-type TFT.
  • the reverse control transistor M2 can also be replaced with a p-type TFT, and only the corresponding n-th
  • the polarity of the scan signal Vscan(n-2) of the two rows may be changed, and the type change of the transistor is well known to those skilled in the art, and will not be described herein;
  • the reverse control transistor M2 When the n-2th row scan signal Vscan(n-2) is active, that is, the n-2th row scan signal Vscan(n-2) is at a high level, the reverse control transistor M2 is turned on.
  • the cathode of the OLED is connected to the n-2th row scan signal Vscan(n-2), and since the voltage of the n-2th row scan signal Vscan(n-2) is greater than the driving voltage Vdd, The OLED is loaded at both ends The reverse voltage difference, while the OLED is turned off and does not emit light, to optimize the aging of the OLED, delay the brightness degradation of the OLED, and prolong the life of the OLED.
  • the data writing unit 10 may include a data writing transistor M3;
  • the data writing transistor M3 is an n-type TFT.
  • the reverse control transistor M2 can also be replaced with a p-type TFT, and only correspondingly
  • the polarity of the scan signal Vscan(n) of the nth row may be changed, and the type change of the transistor is well known to those skilled in the art, and will not be described herein;
  • the data write transistor M3 When the nth row of the scan signal Vscan(n) is active, that is, when the nth row of the scan signal Vscan(n) is at a high level, the data write transistor M3 is turned on, and the data voltage Vdata is written to the gate of the drive transistor M1. pole.
  • the pixel driving circuit of the present disclosure further includes:
  • control unit 12 accessing the n-1th row scan signal Vscan(n-1), and respectively connecting the anode of the OLED and the cathode of the OLED for scanning the signal Vscan(n-1) in the n-1th line
  • the connection between the anode of the OLED and the cathode of the OLED is controlled to control the level of the OLED to become the same, the OLED is turned off and does not emit light, and the Vscan(n) control data writing unit 10 is not affected to write Vdata.
  • the shutdown control unit may include:
  • a gate of the turn-off control transistor is connected to the n-1th row scan signal
  • a first pole of the turn-off control transistor is connected to an anode of the OLED
  • the turn-off A second pole of the control transistor is coupled to the cathode of the OLED.
  • a pixel driving circuit includes a driving transistor M1, a storage capacitor Cs, a reverse control transistor M2, a data writing crystal M3, and a turn-off control transistor M4.
  • the driving transistor M1 its gate is connected to the data power through the data writing unit 10. Pressing Vdata, the first pole thereof is connected to the cathode of the OLED, and the second pole thereof is connected to the ground terminal GND;
  • the storage capacitor Cs is connected between the gate of the driving transistor M1 and the first pole of the driving transistor M1;
  • the anode of the OLED is connected to a driving voltage Vdd;
  • the gate and the first pole thereof are connected to the n-2th row scan signal Vscan(n-2), and the second pole thereof is connected to the cathode of the OLED;
  • the turn-off control transistor M4 For the turn-off control transistor M4, its gate is connected to the n-1th row scan signal Vscan(n-1), its first pole is connected to the anode of the OLED, and its second pole is Cathode connection of OLED;
  • the drive transistor M1, the reverse control transistor M2, the data write transistor M3, and the turn-off control transistor M4 are all n-type TFTs.
  • Vscan(n-2) is introduced to turn on the reverse control transistor M2 in the final stage of a frame picture (ie, before the next OLED light emission), so that the OLED is enabled.
  • the reverse voltage difference is applied at both ends, and the OLED is turned off and does not emit light, eliminating the defects caused by the OLED loading forward voltage difference, achieving the effect of prolonging the life of the OLED, and then introducing Vscan(n-1), the turn-off control transistor M4 is turned on and the reverse control transistor M2 is turned off, the potential of both ends of the OLED is the same, the OLED is turned off and does not emit light, and the Vscan(n) is not affected to turn on the Vdata introduced by the data writing transistor M3, because the scanning signal is high.
  • the level time is very short, which is smaller than the resolution time of the human eye and does not affect the display effect of the AMOLED display panel.
  • the driving method of the pixel driving circuit of the embodiment of the present disclosure is used to drive the pixel driving circuit described above, and the driving method includes:
  • the voltage of the n-2th row scanning signal is greater than the driving voltage, and n is greater than 2 Integer
  • the data voltage writing unit controls to write the data voltage The gate of the drive transistor.
  • the driving method of the present disclosure further includes:
  • the turn-off control unit controls the connection between the anode of the OLED and the cathode of the OLED when the scan signal of the n-1th row is active.
  • the shift register of the embodiment of the present disclosure includes N stages of the above pixel driving circuit, and N is an integer greater than 2;
  • the nth stage pixel driving circuit respectively accesses the nth row scanning signal and the n-2th row scanning signal, and n is an integer greater than 2 and less than or equal to N.
  • the nth stage pixel driving circuit further accesses the n-1th row scanning signal.
  • the display panel according to the embodiment of the present disclosure includes the above shift register.
  • the display device includes the above display panel.
  • the display device may be, for example, an electronic paper, an OLED display device, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, or the like, or any product or component having a display function.

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  • 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驱动方法、移位寄存器、显示面板和装置。所述像素驱动电路包括驱动晶体管（M1）、存储电容（Cs）和数据写入单元（10）；数据写入单元（10）接入第n行扫描信号（Vscan（n）），用于在第n行扫描信号（Vscan（n））有效时将数据电压（Vdata）写入驱动晶体管（M1）的栅极；所述像素驱动电路还包括：反向控制单元（11），接入第n-2行扫描信号（Vscan（n-2）），并与OLED的阴极连接，用于在第n-2行扫描信号（Vscan（n-2））有效时，控制OLED的阴极接入第n-2行扫描信号（Vscan（n-2））；第n-2行扫描信号（Vscan（n-2））的电压大于驱动电压（Vdd），n为大于2的整数。

Description

像素驱动电路及驱动方法、移位寄存器、显示面板和装置
相关申请的交叉引用
本申请主张在2015年4月21日在中国提交的中国专利申请号No.201510190626.8的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及显示技术领域，尤其涉及一种像素驱动电路及驱动方法、移位寄存器、显示面板和装置。
背景技术
有机发光二极管(Organic Light-Emitting Diode，OLED)为自发光材料，其优点例如有不需用到背光板，同时视角广、画质均匀、反应速度快、较易彩色化、用简单驱动电路即可达到发光、制程简单、可制作成挠曲式面板，符合轻薄短小的原则，因此OLED的应用范围涵盖各尺寸面板。
OLED的寿命一直是各大厂商关注的重点，OLED本身在发光过程中会发生老化，导致亮度降低，其中老化机理有OLED器件中的缺陷、OLED自身材料劣化等多种，在实验中发现OLED发光后，再次加载反向压差，可以起到延长OLED寿命的效果。现有的有源矩阵有机发光二极管(Active-matrix organic light emitting diode，AMOLED)像素驱动电路设计中，少有针对OLED器件本身老化进行优化的像素驱动电路。
发明内容
本公开的主要目的在于提供一种像素驱动电路及驱动方法、移位寄存器、显示面板和装置，以解决相关技术中不存在针对OLED器件本身老化进行优化的像素驱动电路、从而导致OLED器件寿命短的问题。
为了达到上述目的，本公开提供了一种像素驱动电路，用于驱动有机发光二极管(OLED)，包括驱动晶体管、存储电容和数据写入单元；其中所述驱动晶体管的栅极通过所述数据写入单元接入数据电压，所述驱动晶体管的 第一极与所述OLED的阴极连接，并且所述驱动晶体管的第二极接地；所述存储电容连接于所述驱动晶体管的栅极与所述驱动晶体管的第一极之间；所述OLED的阳极接入驱动电压；所述数据写入单元接入第n行扫描信号，用于在所述第n行扫描信号有效时将所述数据电压写入所述驱动晶体管的栅极；
所述像素驱动电路还包括：
反向控制单元，接入第n-2行扫描信号，并与所述OLED的阴极连接，用于在所述第n-2行扫描信号有效时，控制所述OLED的阴极接入所述第n-2行扫描信号；所述第n-2行扫描信号的电压大于所述驱动电压，n为大于2的整数。
实施时，所述反向控制单元包括：反向控制晶体管，其中所述反向控制晶体管的栅极和第一极接入所述第n-2行扫描信号，并且所述反向控制晶体管的第二极与所述OLED的阴极连接。
实施时，本公开所述的像素驱动电路还包括：
关断控制单元，接入第n-1行扫描信号，并分别与所述OLED的阳极和所述OLED的阴极连接，用于在所述第n-1行扫描信号有效时控制导通所述OLED的阳极与所述OLED的阴极之间的连接。
实施时，所述关断控制单元包括：
关断控制晶体管，其中所述关断控制晶体管的栅极接入所述第n-1行扫描信号，所述关断控制晶体管的第一极与所述OLED的阳极连接，并且所述关断控制晶体管的第二极与所述OLED的阴极连接。
实施时，所述数据写入单元包括：
数据写入晶体管，其中所述数据写入晶体管的栅极接入第n行扫描信号，所述数据写入晶体管的第一极接入数据电压，并且所述数据写入晶体管的第二极与所述驱动晶体管的栅极连接。
本公开还提供了一种像素驱动电路的驱动方法，用于驱动上述的像素驱动电路，所述驱动方法包括：
当所述第n-2行扫描信号有效时，控制OLED的阴极接入所述第n-2行扫描信号；所述第n-2行扫描信号的电压大于所述驱动电压，n为大于2的整 数；以及
当所述第n行扫描信号有效时，数据写入单元控制将数据电压写入驱动晶体管的栅极。
实施时，本公开所述的驱动方法还包括：
当第n-1行扫描信号有效时，关断控制单元控制导通所述OLED的阳极与所述OLED的阴极之间的连接。
本公开还提供了一种移位寄存器，包括N级上述的像素驱动电路，N为大于2的整数；
第n级像素驱动电路分别接入第n行扫描信号和第n-2行扫描信号，n为大于2而小于或等于N的整数。
实施时，第n级像素驱动电路还接入第n-1行扫描信号。
本公开还提供了一种显示面板，包括上述的移位寄存器。
本公开还提供了一种显示装置，包括上述的显示面板。
与相关技术相比，本公开所述的像素驱动电路及驱动方法、移位寄存器、显示面板和装置，在一帧画面显示的最后时刻在OLED两端加载反向压差，可以防止OLED器件的老化，起到延长OLED寿命的效果。
附图说明
图1是本公开一实施例所述的像素驱动电路的结构图；
图2是本公开另一实施例所述的像素驱动电路的结构图；
图3是本公开又一实施例所述的像素驱动电路的电路图；
图4是本公开再一实施例所述的像素驱动电路的结构图；以及
图5是本公开一具体实施例所述的像素驱动电路的电路图。
具体实施方式
为使本公开文本的实施例的目的、技术方案和优点更加清楚，下面将结合本公开文本的实施例的附图，对本公开文本的实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开文本的一部分实施例，而不是全部的实施例。基于所描述的本公开文本的实 施例，本领域普通技术人员所获得的所有其他实施例，都属于本公开文本保护的范围。
除非另作定义，此处使用的技术术语或者科学术语应当为本公开文本所属领域内具有一般技能的人士所理解的通常意义。本公开文本专利申请说明书以及权利要求书中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”或者“一”等类似词语也不表示数量限制，而是表示存在至少一个。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也相应地改变。
本公开本公开本公开本公开本公开本公开所有实施例中采用的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。在本公开实施例中，为区分晶体管除栅极之外的两极，将其中的一极称为第一极，并且将另一极称为第二极，其中第一极可以为源极或漏极，并且相应地第二极可以为漏极或源极。此外，按照晶体管的特性区分可以将晶体管分为n型晶体管或p型晶体管。在本公开实施例提供的驱动电路中，所有晶体管均是以n型晶体管为例进行的说明的，但可以理解的是，在采用p型晶体管实现时是本领域技术人员可在没有做出创造性劳动前提下轻易想到的，因此也是在本公开的实施例保护范围内的。
如图1所示，本公开实施例所述的像素驱动电路，用于驱动发光二极管OLED，包括驱动晶体管M1、存储电容Cs和数据写入单元10；
对于所述驱动晶体管M1，其栅极通过所述数据写入单元10接入数据电压Vdata，其第一极与所述OLED的阴极连接，并且其第二极与地端GND连接；
所述存储电容Cs连接于所述驱动晶体管M1的栅极与所述驱动晶体管M1的第一极之间；
所述OLED的阳极接入驱动电压Vdd；
所述数据写入单元10接入第n行扫描信号Vscan(n)，用于在所述第n 行扫描信号Vscan(n)有效时将所述数据电压Vdata写入所述驱动晶体管M1的栅极；
所述像素驱动电路还包括：
反向控制单元11，接入第n-2行扫描信号Vscan(n-2)，并与所述OLED的阴极连接，用于在所述第n-2行扫描信号Vscan(n-2)有效时，控制所述OLED的阴极接入所述第n-2行扫描信号Vscan(n-2)，使得所述OLED两端加载反向压差；所述第n-2行扫描信号Vscan(n-2)的电压大于所述驱动电压Vdd，n为大于2的整数。
在如图1所示的像素驱动电路的实施例中，所述驱动晶体管M1为n型薄膜晶体管(Thin Film Transistor，TFT)，在实际操作时，所述驱动晶体管M1也可以替换为p型TFT，晶体管的类型更换为本领域技术人员所公知，在此不再赘述。
本公开如图1所示的实施例所述的像素驱动电路通过采用反向控制单元，以控制在一帧画面显示的最后时刻在OLED两端加载反向压差，同时OLED关断不发光，可以在利用现有的扫描信号、无需增加新的控制信号的前提下对OLED器件本身的老化进行优化，延缓OLED亮度衰减，起到延长OLED寿命的效果。
具体地，如图2所示，所述反向控制单元11可以包括：反向控制晶体管M2，其中所述反向控制晶体管M2的栅极和第一极接入所述第n-2行扫描信号Vscan(n-2)，并且所述反向控制晶体管M2的第二极与所述OLED的阴极连接；
在如图2所示的实施例中，所述反向控制晶体管M2为n型TFT，在实际操作时，所述反向控制晶体管M2也可以替换为p型TFT，只需相应的第n-2行扫描信号Vscan(n-2)的极性变化即可，晶体管的类型更换为本领域技术人员所公知，在此不再赘述；
当所述第n-2行扫描信号Vscan(n-2)有效时，即所述第n-2行扫描信号Vscan(n-2)为高电平时，所述反向控制晶体管M2导通，使得所述OLED的阴极接入所述第n-2行扫描信号Vscan(n-2)，由于所述第n-2行扫描信号Vscan(n-2)的电压大于所述驱动电压Vdd，所以此时所述OLED两端加载 反向压差，同时OLED关断不发光，以对OLED的老化进行优化，延缓OLED亮度衰减，延长OLED的寿命。
在具体实施时，如图3所示，所述数据写入单元10可以包括数据写入晶体管M3；
对于所述数据写入晶体管M3，其栅极接入第n行扫描信号Vscan(n)，其第一极接入数据电压Vdata，并且其第二极与所述驱动晶体管M1的栅极连接；
在如图3所示的像素驱动电路的实施例中，所述数据写入晶体管M3为n型TFT，在实际操作时，所述反向控制晶体管M2也可以替换为p型TFT，只需相应的第n行扫描信号Vscan(n)的极性变化即可，晶体管的类型更换为本领域技术人员所公知，在此不再赘述；
当第n行扫描信号Vscan(n)有效时，即当第n行扫描信号Vscan(n)为高电平时，所述数据写入晶体管M3导通，并且数据电压Vdata写入驱动晶体管M1的栅极。
可选地，如图4所示，本公开所述的像素驱动电路还包括：
关断控制单元12，接入第n-1行扫描信号Vscan(n-1)，并分别与OLED的阳极和OLED的阴极连接，用于在第n-1行扫描信号Vscan(n-1)有效时控制导通OLED的阳极与OLED的阴极之间的连接，以控制OLED两端电平变为相同，OLED关断不发光，不影响Vscan(n)控制数据写入单元10将Vdata写入所述驱动晶体管M1的栅极。
具体地，所述关断控制单元可以包括：
关断控制晶体管，其中所述关断控制晶体管的栅极接入所述第n-1行扫描信号，所述关断控制晶体管的第一极与所述OLED的阳极连接，并且所述关断控制晶体管的第二极与所述OLED的阴极连接。
下面根据一具体实施例来说明本公开所述的像素驱动电路：
如图5所示，本公开一具体实施例所述的像素驱动电路包括驱动晶体管M1、存储电容Cs、反向控制晶体管M2、数据写入晶体M3以及关断控制晶体管M4，其中，
对于所述驱动晶体管M1，其栅极通过所述数据写入单元10接入数据电 压Vdata，其第一极与所述OLED的阴极连接，并且其第二极与地端GND连接；
所述存储电容Cs连接于所述驱动晶体管M1的栅极与所述驱动晶体管M1的第一极之间；
所述OLED的阳极接入驱动电压Vdd；
对于所述反向控制晶体管M2，其栅极和第一极接入所述第n-2行扫描信号Vscan(n-2)，并且其第二极与所述OLED的阴极连接；
对于所述数据写入晶体管M3，其栅极接入第n行扫描信号Vscan(n)，其第一极接入数据电压Vdata，并且其第二极与所述驱动晶体管M1的栅极连接；
对于所述关断控制晶体管M4，其栅极接入所述第n-1行扫描信号Vscan(n-1)，其第一极与所述OLED的阳极连接，并且其第二极与所述OLED的阴极连接；
所述驱动晶体管M1、所述反向控制晶体管M2、所述数据写入晶体管M3和所述关断控制晶体管M4都为n型TFT。
本公开该具体实施例所述的像素驱动电路在工作时，在一帧画面的最后阶段(即下一次OLED发光之前)引入Vscan(n-2)将所述反向控制晶体管M2打开，使得OLED两端加载了反向压差，同时OLED关断不发光，消除OLED加载正向压差时引起的缺陷，达成延长OLED寿命的作用，随后引入Vscan(n-1)，所述关断控制晶体管M4打开而所述反向控制晶体管M2关断，OLED两端电位相同，OLED关断不发光，不影响该行Vscan(n)打开所述数据写入晶体管M3引入的Vdata，由于扫描信号的高电平时间很短，小于人眼的分辨时间，不会影响AMOLED显示面板的显示效果。
本公开实施例所述的像素驱动电路的驱动方法，用于驱动上述的像素驱动电路，所述驱动方法包括：
当所述第n-2行扫描信号有效时，控制OLED的阴极接入所述第n-2行扫描信号；所述第n-2行扫描信号的电压大于所述驱动电压，n为大于2的整数；
当所述第n行扫描信号有效时，数据电压写入单元控制将数据电压写入 驱动晶体管的栅极。
具体地，本公开所述的驱动方法还包括：
当第n-1行扫描信号有效时，关断控制单元控制导通所述OLED的阳极与所述OLED的阴极之间的连接。
本公开实施例所述的移位寄存器，包括N级上述的像素驱动电路，N为大于2的整数；
第n级像素驱动电路分别接入第n行扫描信号和第n-2行扫描信号，n为大于2而小于或等于N的整数。
具体地，第n级像素驱动电路还接入第n-1行扫描信号。
本公开实施例所述的显示面板，包括上述的移位寄存器。
本公开实施例所述的显示装置，包括上述的显示面板。
所述显示装置例如可以为：电子纸、OLED显示装置、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
以上所述是本公开的可选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本公开所述原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本公开的保护范围。

Claims (12)

  1. 一种像素驱动电路，用于驱动有机发光二极管(OLED)，所述像素驱动电路包括驱动晶体管、存储电容和数据写入单元；其中所述驱动晶体管的栅极通过所述数据写入单元接入数据电压，所述驱动晶体管的第一极与所述OLED的阴极连接，并且所述驱动晶体管的第二极接地；所述存储电容连接于所述驱动晶体管的栅极与所述驱动晶体管的第一极之间；所述OLED的阳极接入驱动电压；所述数据写入单元接入第n行扫描信号，用于在所述第n行扫描信号有效时将所述数据电压写入所述驱动晶体管的栅极；其中，所述像素驱动电路还包括：
    反向控制单元，接入第n-2行扫描信号，并与所述OLED的阴极连接，用于在所述第n-2行扫描信号有效时，控制所述OLED的阴极接入所述第n-2行扫描信号；所述第n-2行扫描信号的电压大于所述驱动电压，n为大于2的整数。
  2. 如权利要求1所述的像素驱动电路，其中，所述反向控制单元包括：反向控制晶体管，其中所述反向控制晶体管的栅极和第一极接入所述第n-2行扫描信号，并且所述反向控制晶体管的第二极与所述OLED的阴极连接。
  3. 如权利要求1或2所述的像素驱动电路，还包括：
    关断控制单元，接入第n-1行扫描信号，并分别与所述OLED的阳极和所述OLED的阴极连接，用于在所述第n-1行扫描信号有效时控制导通所述OLED的阳极与所述OLED的阴极之间的连接。
  4. 如权利要求3所述的像素驱动电路，其中，所述关断控制单元包括：
    关断控制晶体管，其中所述关断控制晶体管的栅极接入所述第n-1行扫描信号，所述关断控制晶体管的第一极与所述OLED的阳极连接，并且所述关断控制晶体管的第二极与所述OLED的阴极连接。
  5. 如权利要求1-4中任一权利要求所述的像素驱动电路，其中，所述数据写入单元包括：
    数据写入晶体管，其中所述数据写入晶体管的栅极接入第n行扫描信号，所述数据写入晶体管的第一极接入数据电压，并且所述数据写入晶体管的第 二极与所述驱动晶体管的栅极连接。
  6. 一种像素驱动电路的驱动方法，用于驱动如权利要求1或2所述的像素驱动电路，所述驱动方法包括：
    当所述第n-2行扫描信号有效时，控制OLED的阴极接入所述第n-2行扫描信号；所述第n-2行扫描信号的电压大于所述驱动电压，n为大于2的整数；以及
    当所述第n行扫描信号有效时，数据写入单元控制将数据电压写入驱动晶体管的栅极。
  7. 一种像素驱动电路的驱动方法，用于驱动如权利要求3-5中任一权利要求所述的像素驱动电路，所述驱动方法包括：
    当所述第n-2行扫描信号有效时，控制OLED的阴极接入所述第n-2行扫描信号；所述第n-2行扫描信号的电压大于所述驱动电压，n为大于2的整数；以及
    当所述第n行扫描信号有效时，数据写入单元控制将数据电压写入驱动晶体管的栅极。
  8. 如权利要求7所述的驱动方法，还包括：
    当第n-1行扫描信号有效时，关断控制单元控制导通所述OLED的阳极与所述OLED的阴极之间的连接。
  9. 一种移位寄存器，包括N级如权利要求1至5中任一权利要求所述的像素驱动电路，N为大于2的整数；
    第n级像素驱动电路分别接入第n行扫描信号和第n-2行扫描信号，n为大于2而小于或等于N的整数。
  10. 如权利要求9所述的移位寄存器，其中，第n级像素驱动电路还接入第n-1行扫描信号。
  11. 一种显示面板，包括如权利要求9或10所述的移位寄存器。
  12. 一种显示装置，包括如权利要求11所述的显示面板。
PCT/CN2016/075109 2015-04-21 2016-03-01 像素驱动电路及驱动方法、移位寄存器、显示面板和装置 Ceased WO2016169335A1 (zh)

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