WO2018113221A1 - 一种oled像素电路及其驱动方法、显示装置 - Google Patents

一种oled像素电路及其驱动方法、显示装置 Download PDF

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Publication number
WO2018113221A1
WO2018113221A1 PCT/CN2017/089357 CN2017089357W WO2018113221A1 WO 2018113221 A1 WO2018113221 A1 WO 2018113221A1 CN 2017089357 W CN2017089357 W CN 2017089357W WO 2018113221 A1 WO2018113221 A1 WO 2018113221A1
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WIPO (PCT)
Prior art keywords
transistor
pole
oled
signal input
module
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PCT/CN2017/089357
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English (en)
French (fr)
Inventor
刘冬妮
杨盛际
陈小川
方正
岳晗
付杰
肖丽
王磊
卢鹏程
Original Assignee
京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to JP2017566085A priority Critical patent/JP2020502549A/ja
Priority to EP17821459.9A priority patent/EP3561804B1/en
Priority to US15/580,028 priority patent/US10380946B2/en
Publication of WO2018113221A1 publication Critical patent/WO2018113221A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—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
    • 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
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than 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
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/08—Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to an OLED pixel circuit, a driving method thereof, and a display device.
  • OLED Organic Light-Emitting Diode
  • the AM-OLED (Active Matrix/Organic Light Emitting Diode) display panel has no viewing angle limitation, low manufacturing cost, high response speed, low power consumption, large operating temperature range, and light weight. It can be used for the DC drive of portable machines and can be used as a research hotspot with the advantages of miniaturization and thinning of hardware devices.
  • the film layer is further thinned, and the anode and cathode of the OLED are made.
  • the short circuit between the resistors is small, which affects the voltage difference between the cathode and the anode of the OLED in the peripheral sub-pixel, thereby affecting the display of the peripheral sub-pixels.
  • Embodiments of the present disclosure provide an OLED pixel circuit, a driving method thereof, and a display device, which can prevent a sub-pixel in which a short circuit occurs from affecting display of a peripheral sub-pixel thereof.
  • the first aspect provides an OLED pixel circuit, including a driving module, a light emitting module, and a short circuit protection module; the driving module is respectively connected to a scan signal input end, a data signal input end, a first voltage end, and the light emitting module, For driving under the control of the scan signal input end, the data signal input end, and the first voltage end
  • the light emitting module is further configured to emit light; the light emitting module is further connected to the second voltage end for performing light emission under the control of the driving module and the second voltage end;
  • the short circuit protection module is connected to the driving module and the light emitting And a module, configured to control the driving module to be turned off when a short circuit occurs in the light emitting module.
  • the driving module includes a first transistor, a first capacitor, and a second transistor; a gate of the first transistor is connected to the scan signal input end, a first pole is connected to the data signal input end, and a second a pole connected to the gate of the second transistor; a first pole of the second transistor connected to the first voltage end, a second pole connected to the light emitting module; a first end of the first capacitor connected to the first a second pole of a transistor, the second end being coupled to the first pole of the second transistor; wherein the second transistor is an N-type transistor.
  • the driving module includes a first transistor, a first capacitor, and a second transistor; a gate of the first transistor is connected to the scan signal input end, a first pole is connected to the data signal input end, and a second a pole connected to the gate of the second transistor; a first pole of the second transistor connected to the first voltage end, a second pole connected to the light emitting module; a first end of the first capacitor connected to the first a second pole of a transistor, the second end being coupled to the second pole of the second transistor; wherein the second transistor is an N-type transistor.
  • the light emitting module comprises an OLED, an anode of the OLED is connected to the driving module, and a cathode is connected to the second voltage end.
  • the short circuit protection module includes a third transistor and a second capacitor; a gate and a first pole of the third transistor are connected to the light emitting module and the driving module, and a second pole is connected to the first a first end of the second capacitor; a second end of the second capacitor is coupled to the driving module; wherein the third transistor is a P-type transistor.
  • the driving module includes a first transistor, a first capacitor, and a second transistor;
  • the light emitting module includes an OLED; a gate and a first pole of the third transistor and a second transistor respectively The diode is connected to the anode of the OLED; the second end of the second capacitor is connected to the second pole of the first transistor and the gate of the second transistor.
  • a gate of the first transistor is connected to the scan signal input end, a first pole is connected to the data signal input end, a second pole is connected to a gate of the second transistor, and the second transistor is a first pole is connected to the first voltage end, and a second pole is connected to the light emitting a first terminal of the first capacitor is connected to a second pole of the first transistor, and a second end is connected to a first pole of the second transistor.
  • a gate of the first transistor is connected to the scan signal input end, a first pole is connected to the data signal input end, a second pole is connected to a gate of the second transistor, and the second transistor is a first pole is connected to the first voltage end, a second pole is connected to the light emitting module; a first end of the first capacitor is connected to a second pole of the first transistor, and a second end is connected to the second transistor The second pole.
  • the short circuit protection module includes a fourth transistor and a second capacitor; a gate of the fourth transistor is connected to the light emitting module and the driving module, and the first pole and the light emitting module and the The second voltage ends are connected, the second pole is connected to the first end of the second capacitor; the second end of the second capacitor is connected to the driving module; wherein the fourth transistor is a P-type transistor.
  • a gate of the first transistor is connected to the scan signal input end, a first pole is connected to the data signal input end, a second pole is connected to a gate of the second transistor, and the second transistor is a first pole is connected to the first voltage end, a second pole is connected to the light emitting module; a first end of the first capacitor is connected to a second pole of the first transistor, and a second end is connected to the second transistor The first pole.
  • a gate of the first transistor is connected to the scan signal input end, a first pole is connected to the data signal input end, a second pole is connected to a gate of the second transistor, and the second transistor is a first pole is connected to the first voltage end, a second pole is connected to the light emitting module; a first end of the first capacitor is connected to a second pole of the first transistor, and a second end is connected to the second transistor The second pole.
  • the driving module includes a first transistor, a first capacitor, and a second transistor;
  • the light emitting module includes an OLED; a gate of the fourth transistor and a second pole of the second transistor, and The anodes of the OLED are all connected, the first pole is connected to the cathode of the OLED and the second voltage end; the second end of the second capacitor is opposite to the second pole of the first transistor and the second transistor The gates are all connected.
  • the first transistor is an N-type transistor.
  • a display device comprising the OLED pixel circuit of the first aspect.
  • the third aspect provides a driving method of the OLED pixel circuit according to the first aspect, wherein the driving method comprises: inputting a scanning signal at a scanning signal input end, inputting a data signal at a data signal input end, and driving the module to drive the light emitting module to emit light; If the lighting module is short-circuited, the short-circuit protection module controls the driving module to be turned off.
  • the driving method includes: inputting a scan signal to the scan signal input end, controlling the first transistor to be turned on; inputting a data signal to the data signal input end, controlling the second transistor to turn on, driving the OLED to emit light; if the OLED is Normally emitting light, the signal outputted by the second transistor to the anode controls the third transistor to be turned off; if the OLED is short-circuited, the signal applied to the anode by the second voltage terminal controls the third transistor to be turned on, so that The second transistor is turned off.
  • the driving method includes: inputting a scan signal to the scan signal input end, controlling the first transistor to be turned on; inputting a data signal to the data signal input end, controlling the second transistor to turn on, driving the OLED to emit light; if the OLED is Normally emitting light, the signal outputted by the second transistor to the anode controls the fourth transistor to be turned off; if the OLED is short-circuited, the signal applied to the anode by the second voltage terminal controls the fourth transistor to be turned on, so that The second transistor is turned off.
  • An embodiment of the present disclosure provides an OLED pixel circuit, a driving method thereof, and a display device.
  • a short-circuit protection module is added to an OLED pixel circuit, and the light-emitting module of the sub-pixel emits light normally, the short-circuit protection module is turned off; and when the sub-pixel is After the short circuit of the light-emitting module occurs, the short-circuit protection module is turned on, and the control module is turned off, so that the signals of the first voltage end and the data line number input end cannot be output to the light-emitting module, so that even if the light-emitting module is short-circuited, it is connected with the light-emitting module.
  • the signal at the second voltage end does not rise, but still maintains its original signal strength, thereby preventing a sub-pixel from being short-circuited and affecting the normal display of its surrounding sub-pixels.
  • FIG. 1 is a schematic structural view of an OLED pixel circuit
  • FIG. 2 is a schematic structural diagram of an OLED pixel circuit according to an embodiment of the present disclosure
  • FIG. 3 is a schematic view of a specific structure of each module of Figure 2;
  • Figure 4 is a schematic diagram 2 of a specific structure of each module in Figure 2;
  • FIG. 5 is a schematic diagram 3 of a specific structure of each module in Figure 2;
  • FIG. 6 is a schematic diagram 4 of a specific structure of each module in FIG. 2.
  • 10-drive module 20-light module; 30-short circuit protection module; GATE-scan signal input terminal; DATA-data signal input terminal; V1-first voltage terminal; V2-second voltage terminal; C1-first capacitor; C2-second capacitance; T1-first transistor; T2-second transistor; T3-third transistor.
  • FIG. 1 is a schematic structural diagram of an OLED pixel circuit. As shown in FIG. 1 , in a pixel structure of an AM-OLED display panel, a set of transistors and a first capacitor are integrated in each sub-pixel, and the transistor and the first pass are The drive control of the capacitor enables control of the current of the OLED in the sub-pixel, thereby driving the OLED to emit light.
  • FIG. 2 Another embodiment of the present disclosure provides an OLED pixel circuit, as shown in FIG. 2, including a driving module 10, a light emitting module 20, and a short circuit protection module 30.
  • the driving module 10 is respectively connected to the scan signal input terminal GATE, the data signal input terminal DATA, the first voltage terminal V1 and the light emitting module 20, and is used for the scan signal input terminal GATE, the data signal input terminal DATA, and the first voltage terminal V1. Under control, the illumination module 20 is driven to emit light.
  • the light emitting module 20 is also connected to the second voltage terminal V2 for performing light emission under the control of the driving module 10 and the second voltage terminal V2.
  • the short circuit protection module 30 is connected to the driving module 10 and the light emitting module 20 for controlling the driving module 10 to be turned off when the light emitting module 20 is short-circuited.
  • An embodiment of the present disclosure provides an OLED pixel circuit, by adding a short-circuit protection module 30 in an OLED pixel circuit, and when the light-emitting module 20 of the sub-pixel is normally illuminated, the short-circuit protection module 30 is turned off; and when the light-emitting module 20 of the sub-pixel occurs After the short circuit, the short circuit protection module 30 is turned on, and the driving module 10 is controlled to be turned off, so that the signals of the first voltage terminal V1 and the data line number input terminal DATA cannot be output to the light emitting module 20, so that even if the light emitting module 20 is short-circuited, The signal of the second voltage terminal V2 connected to the light-emitting module 20 does not rise, but still maintains its original signal strength, thereby preventing a sub-pixel from being short-circuited and affecting the normal display of its peripheral sub-pixels.
  • Embodiment 1 provides an OLED pixel circuit.
  • the driving module 10 includes a first transistor T1, a first capacitor C1, and a second transistor T2.
  • the gate of the first transistor T1 is connected to the scan signal input terminal GATE, the first pole is connected to the data signal input terminal DATA, and the second pole is connected to the gate of the second transistor T2.
  • the first pole of the second transistor T2 is connected to the first voltage terminal V1, and the second pole is connected to the light emitting module 20.
  • the first end of the first capacitor C1 is connected to the second pole of the first transistor T1, and the second end is connected to the first pole of the second transistor T2.
  • the first end of the first capacitor C1 is connected to the second pole of the first transistor T1, and the second end is connected to the second pole of the second transistor T2.
  • the light emitting module 20 includes an OLED, an anode of the OLED is connected to the driving module 10, and a cathode is connected to the second voltage terminal V2.
  • the short circuit protection module 30 includes a third transistor T3 and a second capacitor C2.
  • the gate and the first pole of the third transistor T3 are both connected to the light emitting module 20 and the driving module 10, and the second pole is connected to the first end of the second capacitor C2.
  • the second end of the second capacitor is coupled to the drive module 10.
  • the second transistor T2 is an N-type transistor; and the third transistor T3 is a P-type crystal Body tube.
  • first pole of the second transistor T2 is connected to the first voltage terminal V1, and the second pole is connected to the anode of the OLED.
  • the first end of the first capacitor C1 is connected to the second pole of the first transistor T1 and the gate of the second transistor T2, and the first end and the first pole of the second transistor T2 and the first voltage are connected. Terminals V1 are connected.
  • the first end of the first capacitor C1 is connected to the second pole of the first transistor T1 and the gate of the second transistor T2, and the second end and the second pole of the second transistor T2 and the OLED The anodes are all connected.
  • the gate of the third transistor T3 is connected to the second pole of the second transistor T2 and the anode of the OLED; the first pole is connected to the second pole of the second transistor T2 and the anode of the OLED; the second pole and the second capacitor C2 The first end of the connection.
  • the second end of the second capacitor C2 is connected to both the second pole of the first transistor T1 and the gate of the second transistor T2.
  • the first transistor T1 may be an N-type transistor or a P-type transistor.
  • the preferred first transistor T1 of the disclosed embodiment is an N-type transistor.
  • the first transistor T1 is exemplified as an N-type transistor.
  • the transistor provided by the embodiment of the present disclosure may be an enhancement transistor or a depletion transistor.
  • the first pole of the transistor provided by the embodiment of the present disclosure may be a source, the second electrode may be a drain, or a transistor.
  • the first pole may be a drain and the second pole is a source.
  • the present disclosure does not limit this, and may be appropriately selected according to the type of the transistor.
  • the first voltage terminal V1 is constantly outputting a high level
  • the second voltage terminal V2 is constantly outputting a low level as an example.
  • the second voltage terminal V2 pulls the high voltage signal input from the data signal input terminal DATA to the second capacitor C2 through the third transistor T3 to avoid the high input of the data signal input terminal DATA.
  • the voltage signal is output to the anode of the OLED.
  • the first transistor T1 when the scan signal input terminal GATE inputs the scan signal, the first transistor T1 is turned on, and the data signal input terminal DATA inputs the data signal, and is output to the gate of the second transistor T2 via the first transistor T1. Extremely, simultaneously to the first capacitor C1 is charged.
  • the second transistor T2 is a P-type transistor. Under the control of the high voltage signal, the second transistor T2 is turned on, and the high voltage signal of the first voltage terminal V1 is output to the anode of the OLED via the second transistor T2 while the second voltage terminal V2 is low. The voltage signal is output to the cathode of the OLED to drive the OLED to emit light.
  • the third transistor T3 is an N-type transistor, which is turned on after the gate receives the low voltage signal. In the normal display, the anode of the OLED outputs a high voltage signal to the gate of the third transistor T3, and the third transistor T3 is turned off.
  • the potential on the anode is lowered.
  • the anode outputs a low voltage signal to the gate of the third transistor T3, and the third transistor T3 is controlled to be turned on, and the low voltage signal on the anode passes through the third transistor T3.
  • the output is to the gate of the second transistor T2, and the second transistor T2 is turned off under the control of the low voltage signal.
  • the high voltage signal of the first voltage terminal V1 stops outputting to the anode, and the second voltage terminal V2 pulls down the high voltage signal of the data signal input terminal DATA input to the second capacitor C2 through the third transistor T3, so that the data signal input terminal DATA The high voltage signal cannot be output to the anode.
  • the low potential on the cathode does not rise due to neutralization with the high potential on the anode, and thus does not affect the signal at the second voltage terminal V2.
  • the second embodiment provides an OLED pixel circuit.
  • the driving module 10 includes a first transistor T1, a first capacitor C1, and a second transistor T2.
  • the gate of the first transistor T1 is connected to the scan signal input terminal GATE, the first pole is connected to the data signal input terminal DATA, and the second pole is connected to the gate of the second transistor T2.
  • the first pole of the second transistor T2 is connected to the first voltage terminal V1, and the second pole is connected to the light emitting module 20.
  • the first end of the first capacitor C1 is connected to the second pole of the first transistor T1, and the second end is connected to the first pole of the second transistor T2.
  • the first end of the first capacitor C1 is connected to the second pole of the first transistor T1, and the second end is connected to the second pole of the second transistor T2.
  • the light emitting module 20 includes an OLED, an anode of the OLED is connected to the driving module 10, and a cathode is connected to the second voltage terminal V2.
  • the short circuit protection module 30 includes a fourth transistor T4 and a second capacitor; a fourth transistor The gate of the T4 is connected to the light emitting module 20 and the driving module 10. The first pole is connected to the light emitting module 20 and the second voltage terminal V2, and the second pole is connected to the first end of the second capacitor C2.
  • the second end of the second capacitor C2 is connected to the driving module 20.
  • the second transistor T2 is an N-type transistor; the fourth transistor T4 is a P-type transistor.
  • first pole of the second transistor T2 is connected to the first voltage terminal V1, and the second pole is connected to the anode of the OLED.
  • the first end of the first capacitor C1 is connected to the second pole of the first transistor T1 and the gate of the second transistor T2, and the second end and the first pole of the second transistor T2 and the first voltage Terminals V1 are connected.
  • the first end of the first capacitor C1 is connected to the second pole of the first transistor T1 and the gate of the second transistor T2, and the second end and the second pole of the second transistor T2 and the OLED The anodes are all connected.
  • the gate of the fourth transistor T4 is connected to the second pole of the second transistor T2 and the anode of the OLED; the first pole is connected to the second voltage terminal V2 and the cathode of the OLED; and the second pole is connected to the first capacitor C2. end.
  • the second end of the second capacitor C2 is connected to both the second pole of the first transistor T1 and the gate of the second transistor T2.
  • the first transistor T1 is turned on, and the data signal input terminal DATA is input to the data signal, and is output to the gate of the second transistor T2 via the first transistor T1.
  • the first capacitor C1 is charged.
  • the second transistor T2 is a P-type transistor. Under the control of the high voltage signal, the second transistor T2 is turned on, and the high voltage signal of the first voltage terminal V1 is output to the anode of the OLED via the second transistor T2 while the second voltage terminal V2 is low. The voltage signal is output to the cathode of the OLED to drive the OLED to emit light.
  • the fourth transistor T4 is an N-type transistor, which is turned on after the gate receives the low voltage signal. In the normal display, the anode of the OLED outputs a high voltage signal to the gate of the fourth transistor T4, and the fourth transistor T4 is turned off.
  • the potential on the anode is lowered.
  • the anode outputs a low voltage signal to the gate of the fourth transistor T4, controlling the fourth transistor T4 to be turned on, and the low voltage signal on the second voltage terminal V2 is passed.
  • the fourth transistor T4 is output to the second At the gate of transistor T2, the second transistor T2 is turned off under the control of the low voltage signal.
  • the high voltage signal of the first voltage terminal V1 stops outputting to the anode, and the second voltage terminal V2 pulls down the high voltage signal of the data signal input terminal DATA input to the second capacitor C2 through the third transistor T3, so that the data signal input terminal DATA The high voltage signal cannot be output to the anode.
  • Embodiments of the present disclosure also provide a display device including any of the above OLED pixel circuits. It has the same structure and advantageous effects as the OLED pixel circuit provided by the foregoing embodiment. The structure and beneficial effects of the OLED pixel circuit have been described in detail since the foregoing embodiments, and are not described herein again.
  • the embodiment of the present disclosure further provides a driving method of the foregoing OLED pixel circuit, where the driving method includes:
  • the scan signal input terminal GATE inputs a scan signal
  • the data signal input terminal DATA inputs a data signal
  • the drive module 10 drives the light emitting module 20 to emit light.
  • the short-circuit protection module 30 controls the driving module 10 to be turned off.
  • the scan signal input terminal GATE inputs a scan signal to control the first transistor T1 to be turned on;
  • the data signal input terminal DATA inputs a data signal, and controls the second transistor T2 to be turned on to drive the OLED to emit light.
  • the signal outputted by the first voltage terminal V1 to the anode via the second transistor T2 controls the third transistor T3 to be turned off.
  • the signal applied to the anode by the second voltage terminal V2 controls the third transistor T3 to be turned on, and the signal applied to the anode by the second voltage terminal V2 controls the second transistor T2 to be turned off.
  • the signal outputted from the first voltage terminal V1 to the anode via the second transistor T2 controls the fourth transistor T4 to be turned off.
  • the signal applied to the anode by the second voltage terminal V2 controls the fourth transistor T4 to be turned on, and the signal at the second voltage terminal V2 directly controls the second transistor T2 to be turned off.
  • Embodiments of the present disclosure provide a driving method of an OLED pixel circuit by adding a short-circuit protection module 30 in an OLED pixel circuit, and a light-emitting module in a sub-pixel
  • the short circuit protection module 30 When the light is normally illuminated, the short circuit protection module 30 is turned off; and when the light emitting module 20 of the sub-pixel is short-circuited, the short circuit protection module 30 is turned on, and the driving module 10 is controlled to be turned off, so that the first voltage terminal V1 and the data line number input terminal DATA
  • the signal cannot be output to the light-emitting module 20, so that even if the light-emitting module 20 is short-circuited, the signal of the second voltage terminal V2 connected to the light-emitting module 20 does not rise, but still maintains its original signal strength. Therefore, it is possible to prevent a sub-pixel from being short-circuited and affecting the normal display of its peripheral sub-pixels.

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Abstract

一种OLED像素电路及其驱动方法、显示装置，涉及显示技术领域，可避免发生短路的子像素影响其周边子像素的显示。OLED像素电路包括：驱动模块(10)、发光模块(20)、以及短路保护模块(30)；驱动模块(10)，分别连接扫描信号输入端(GATE)、数据信号输入端(DATA)、第一电压端(V1)和发光模块(20)，用于在扫描信号输入端(GATE)、数据信号输入端(DATA)、和第一电压端(V1)的控制下，驱动发光模块(20)发光；发光模块(20)还连接第二电压端(V2)，用于在驱动模块(10)和第二电压端(V2)的控制下，进行发光；短路保护模块(30)连接驱动模块(10)和发光模块(20)，用于在发光模块(20)发生短路时，控制驱动模块(10)关闭。

Description

一种OLED像素电路及其驱动方法、显示装置 技术领域
本公开涉及显示技术领域，尤其涉及一种OLED像素电路及其驱动方法、显示装置。
背景技术
随着多媒体技术的快速发展，OLED(Organic Light-Emitting Diode，有机发光二极管)由于具有能自发光、高对比度、色域广、制备工艺简单、功耗低、易于实现柔性显示等优点，成为显示装置中重要的发光元件。
其中，尤其是AM-OLED(Active Matrix/Organic Light Emitting Diode，主动式矩阵有机发光二极管)显示面板具有无视角限制、低制造成本、高应答速度、低功耗、工作温度范围大、重量轻、可用于可携式机器的直流驱动且可随硬件设备小型化及轻薄化等优点，而成为研究的热点。
然而，由于OLED的阳极和阴极之间的各膜层本身较薄，而膜层有异物，或者挖孔、爬坡等工艺没有控制好，会进一步导致膜层变薄，使OLED的阳极和阴极之间电阻较小而发生短路，从而影响周边子像素中OLED阴极和阳极之间的压差，进而影响周边子像素的显示。
发明内容
本公开的实施例提供一种OLED像素电路及其驱动方法、显示装置，可避免发生短路的子像素影响其周边子像素的显示。
为达到上述目的，本公开的实施例采用如下技术方案：
第一方面，提供一种OLED像素电路，包括驱动模块、发光模块、以及短路保护模块；所述驱动模块，分别连接扫描信号输入端、数据信号输入端、第一电压端和所述发光模块，用于在所述扫描信号输入端、所述数据信号输入端、和所述第一电压端的控制下，驱动所 述发光模块发光；所述发光模块还连接第二电压端，用于在所述驱动模块和所述第二电压端的控制下，进行发光；所述短路保护模块连接所述驱动模块和所述发光模块，用于在所述发光模块发生短路时，控制所述驱动模块关闭。
可选的，所述驱动模块包括第一晶体管、第一电容和第二晶体管；所述第一晶体管的栅极连接所述扫描信号输入端，第一极连接所述数据信号输入端，第二极连接所述第二晶体管的栅极；所述第二晶体管的第一极连接所述第一电压端，第二极连接所述发光模块；所述第一电容的第一端连接所述第一晶体管的第二极，第二端连接所述第二晶体管的第一极；其中，所述第二晶体管为N型晶体管。
可选的，所述驱动模块包括第一晶体管、第一电容和第二晶体管；所述第一晶体管的栅极连接所述扫描信号输入端，第一极连接所述数据信号输入端，第二极连接所述第二晶体管的栅极；所述第二晶体管的第一极连接所述第一电压端，第二极连接所述发光模块；所述第一电容的第一端连接所述第一晶体管的第二极，第二端连接所述第二晶体管的第二极；其中，所述第二晶体管为N型晶体管。
可选的，所述发光模块包括OLED，所述OLED的阳极连接所述驱动模块，阴极连接所述第二电压端。
可选的，所述短路保护模块包括第三晶体管和第二电容；所述第三晶体管的栅极和第一极均与所述发光模块和所述驱动模块连接，第二极连接所述第二电容的第一端；所述第二电容的第二端连接所述驱动模块；其中，所述第三晶体管为P型晶体管。
进一步可选的，所述驱动模块包括第一晶体管、第一电容和第二晶体管；所述发光模块包括OLED；所述第三晶体管的栅极和第一极分别与所述第二晶体管的第二极和所述OLED的阳极均连接；所述第二电容的第二端与所述第一晶体管的第二极和所述第二晶体管的栅极均连接。
可选的，所述第一晶体管的栅极连接所述扫描信号输入端，第一极连接所述数据信号输入端，第二极连接所述第二晶体管的栅极；所述第二晶体管的第一极连接所述第一电压端，第二极连接所述发光 模块；所述第一电容的第一端连接所述第一晶体管的第二极，第二端连接所述第二晶体管的第一极。
可选的，所述第一晶体管的栅极连接所述扫描信号输入端，第一极连接所述数据信号输入端，第二极连接所述第二晶体管的栅极；所述第二晶体管的第一极连接所述第一电压端，第二极连接所述发光模块；所述第一电容的第一端连接所述第一晶体管的第二极，第二端连接所述第二晶体管的第二极。
可选的，所述短路保护模块包括第四晶体管和第二电容；所述第四晶体管的栅极与所述发光模块和所述驱动模块均连接，第一极与所述发光模块和所述第二电压端均连接，第二极连接所述第二电容的第一端；所述第二电容的第二端连接所述驱动模块；其中，所述第四晶体管为P型晶体管。
可选的，所述第一晶体管的栅极连接所述扫描信号输入端，第一极连接所述数据信号输入端，第二极连接所述第二晶体管的栅极；所述第二晶体管的第一极连接所述第一电压端，第二极连接所述发光模块；所述第一电容的第一端连接所述第一晶体管的第二极，第二端连接所述第二晶体管的第一极。
可选的，所述第一晶体管的栅极连接所述扫描信号输入端，第一极连接所述数据信号输入端，第二极连接所述第二晶体管的栅极；所述第二晶体管的第一极连接所述第一电压端，第二极连接所述发光模块；所述第一电容的第一端连接所述第一晶体管的第二极，第二端连接所述第二晶体管的第二极。
进一步可选的，所述驱动模块包括第一晶体管、第一电容和第二晶体管；所述发光模块包括OLED；所述第四晶体管的栅极与所述第二晶体管的第二极和所述OLED的阳极均连接，第一极与所述OLED的阴极和所述第二电压端均连接；所述第二电容的第二端与所述第一晶体管的第二极和所述第二晶体管的栅极均连接。
可选的，所述第一晶体管为N型晶体管。
第二方面，提供一种显示装置，包括第一方面所述的OLED像素电路。
第三方面，提供一种如第一方面所述的OLED像素电路的驱动方法，所述驱动方法包括：扫描信号输入端输入扫描信号，数据信号输入端输入数据信号，驱动模块驱动发光模块发光；若发光模块发生短路，短路保护模块控制所述驱动模块关闭。
可选的，所述驱动方法包括：所述扫描信号输入端输入扫描信号，控制第一晶体管打开；所述数据信号输入端输入数据信号，控制第二晶体管打开，驱动OLED发光；若所述OLED正常发光，所述第二晶体管输出到阳极上的信号控制第三晶体管截止；若所述OLED发生短路，第二电压端作用到所述阳极上的信号控制所述第三晶体管打开，以使所述第二晶体管截止。
可选的，所述驱动方法包括：所述扫描信号输入端输入扫描信号，控制第一晶体管打开；所述数据信号输入端输入数据信号，控制第二晶体管打开，驱动OLED发光；若所述OLED正常发光，所述第二晶体管输出到阳极上的信号控制第四晶体管截止；若所述OLED发生短路，第二电压端作用到所述阳极上的信号控制所述第四晶体管打开，以使所述第二晶体管截止。
本公开实施例提供一种OLED像素电路及其驱动方法、显示装置，通过在OLED像素电路中加入短路保护模块，并且在子像素的发光模块正常发光时，短路保护模块关闭；而当子像素的发光模块发生短路后，短路保护模块则开启，并控制驱动模块关闭，使得第一电压端和数据线号输入端的信号无法输出到发光模块，这样一来，即使发光模块发生短路，与发光模块连接的第二电压端的信号也不会升高，而是仍然保持其原有的信号强度，从而可避免某一子像素发生短路后影响其周边子像素的正常显示。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例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公开的一些实施例，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为一种OLED像素电路的结构示意图；
图2为本公开实施例提供的一种OLED像素电路的结构示意图；
图3为图2中各模块的一种具体结构示意图一；
图4为图2中各模块的一种具体结构示意图二；
图5为图2中各模块的一种具体结构示意图三；
图6为图2中各模块的一种具体结构示意图四。
附图标记
10-驱动模块；20-发光模块；30-短路保护模块；GATE-扫描信号输入端；DATA-数据信号输入端；V1-第一电压端；V2-第二电压端；C1-第一电容；C2-第二电容；T1-第一晶体管；T2-第二晶体管；T3-第三晶体管。
具体实施方式
下面将结合本公开实施例中的附图，对本公开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公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，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，都属于本公开保护的范围。
图1为一种OLED像素电路的结构示意图，如图1所示，AM-OLED显示面板的像素结构中，每一个子像素中都集成了一组晶体管和第一电容，通过对晶体管和第一电容的驱动控制，实现对子像素中的OLED的电流的控制，从而驱动OLED发光。
本公开另一实施例提供一种OLED像素电路，如图2所示，包括驱动模块10、发光模块20、以及短路保护模块30。
驱动模块10，分别连接扫描信号输入端GATE、数据信号输入端DATA、第一电压端V1和发光模块20，用于在扫描信号输入端GATE、数据信号输入端DATA、和第一电压端V1的控制下，驱动发光模块20发光。
发光模块20还连接第二电压端V2，用于在驱动模块10和第二电压端V2的控制下，进行发光。
短路保护模块30连接驱动模块10和发光模块20，用于在发光模块20发生短路时，控制驱动模块10关闭。
本公开实施例提供一种OLED像素电路，通过在OLED像素电路中加入短路保护模块30，并且在子像素的发光模块20正常发光时，短路保护模块30关闭；而当子像素的发光模块20发生短路后，短路保护模块30则开启，并控制驱动模块10关闭，使得第一电压端V1和数据线号输入端DATA的信号无法输出到发光模块20，这样一来，即使发光模块20发生短路，与发光模块20连接的第二电压端V2的信号也不会升高，而是仍然保持其原有的信号强度，从而可避免某一子像素发生短路后影响其周边子像素的正常显示。
以下结合具体的实施例，对图2中各个模块的具体结构进行详细的说明。
实施例一
实施例一提供一种OLED像素电路，如图3所示，驱动模块10包括第一晶体管T1、第一电容C1和第二晶体管T2。
第一晶体管T1的栅极连接扫描信号输入端GATE，第一极连接数据信号输入端DATA，第二极连接第二晶体管T2的栅极。
第二晶体管T2的第一极连接第一电压端V1，第二极连接发光模块20。
第一电容C1的第一端连接第一晶体管T1的第二极，第二端连接第二晶体管T2的第一极。
或者，如图4所示，第一电容C1的第一端连接第一晶体管T1的第二极，第二端连接第二晶体管T2的第二极。
发光模块20包括OLED，OLED的阳极连接驱动模块10，阴极连接第二电压端V2。
短路保护模块30包括第三晶体管T3和第二电容C2，第三晶体管T3的栅极和第一极均与发光模块20和驱动模块10连接，第二极连接第二电容C2的第一端。
第二电容的第二端连接驱动模块10。
其中，第二晶体管T2为N型晶体管；第三晶体管T3为P型晶 体管。
进一步具体的，第二晶体管T2的第一极连接第一电压端V1，第二极连接OLED的阳极。
如图3所示，第一电容C1的第一端与第一晶体管T1的第二极和第二晶体管T2的栅极均连接，第二端与第二晶体管T2的第一极和第一电压端V1均连接。
或者，如图4所示，第一电容C1的第一端与第一晶体管T1的第二极和第二晶体管T2的栅极均连接，第二端与第二晶体管T2的第二极和OLED的阳极均连接。
第三晶体管T3的栅极与第二晶体管T2的第二极和OLED的阳极均连接；第一极与第二晶体管T2的第二极和OLED的阳极均连接；第二极与第二电容C2的第一端连接。
第二电容C2的第二端与第一晶体管T1的第二极和第二晶体管T2的栅极均连接。
需要说明的是，第一，第一晶体管T1可以为N型晶体管，也可以为P型晶体管。本公开实施例优选的第一晶体管T1为N型晶体管。图3和图4中以第一晶体管T1为N型晶体管进行示例。
第二，本公开实施例提供的晶体管可以为增强型晶体管，也可以为耗尽型晶体管；本公开实施例提供的晶体管的第一极可以为源极，第二极可以为漏极，或者晶体管的第一极可以为漏极，第二极为源极，本公开对此不作限定，根据晶体管的类型合理选择即可。
第三，本公开实施中是以第一电压端V1恒定输出高电平，第二电压端V2恒定输出低电平为例进行的说明。
第四，在第三晶体管T3打开后，第二电压端V2通过第三晶体管T3将数据信号输入端DATA输入到第二电容C2的高电压信号拉低，以避免数据信号输入端DATA输入的高电压信号输出到OLED的阳极。
以上，如图3和图4所示，当扫描信号输入端GATE输入扫描信号，第一晶体管T1打开，数据信号输入端DATA输入数据信号，经第一晶体管T1后输出到第二晶体管T2的栅极，同时向第一电容 C1充电。第二晶体管T2为P型晶体管，在高电压信号控制下，第二晶体管T2打开，第一电压端V1的高电压信号经第二晶体管T2输出至OLED的阳极，同时第二电压端V2的低电压信号输出至OLED的阴极，驱动OLED发光。其中，第三晶体管T3为N型晶体管，其在栅极接收到低电压信号后打开，正常显示情况下，OLED的阳极向第三晶体管T3的栅极输出高电压信号，第三晶体管T3截止。
当OLED的阳极和阴极发生短路，阳极上的电位降低，此时，阳极向第三晶体管T3的栅极输出低电压信号，控制第三晶体管T3打开，阳极上的低电压信号经第三晶体管T3输出至第二晶体管T2的栅极，在低电压信号控制下，第二晶体管T2截止。第一电压端V1的高电压信号停止向阳极输出，并且第二电压端V2通过第三晶体管T3将数据信号输入端DATA输入到第二电容C2的高电压信号拉低，使数据信号输入端DATA的高电压信号也无法输出到阳极。
基于此，OLED的阳极和阴极发生短路后，阴极上的低电位不会因和阳极上的高电位中和而升高，因此不会影响第二电压端V2上的信号。
实施例二
实施例二提供一种OLED像素电路，如图5所示，驱动模块10包括第一晶体管T1、第一电容C1和第二晶体管T2。
第一晶体管T1的栅极连接扫描信号输入端GATE，第一极连接数据信号输入端DATA，第二极连接第二晶体管T2的栅极。
第二晶体管T2的第一极连接第一电压端V1，第二极连接发光模块20。
第一电容C1的第一端连接第一晶体管T1的第二极，第二端连接第二晶体管T2的第一极。
或者，如图6所示，第一电容C1的第一端连接第一晶体管T1的第二极，第二端连接第二晶体管T2的第二极。
发光模块20包括OLED，OLED的阳极连接驱动模块10，阴极连接第二电压端V2。
短路保护模块30包括第四晶体管T4和第二电容；第四晶体管 T4的栅极与发光模块20和驱动模块10均连接，第一极与发光模块20和第二电压端V2均连接，第二极连接第二电容C2的第一端。
第二电容C2的第二端连接驱动模块20。
其中，第二晶体管T2为N型晶体管；第四晶体管T4为P型晶体管。
进一步具体的，第二晶体管T2的第一极连接第一电压端V1，第二极连接OLED的阳极。
如图5所示，第一电容C1的第一端与第一晶体管T1的第二极和第二晶体管T2的栅极均连接，第二端与第二晶体管T2的第一极和第一电压端V1均连接。
或者，如图6所示，第一电容C1的第一端与第一晶体管T1的第二极和第二晶体管T2的栅极均连接，第二端与第二晶体管T2的第二极和OLED的阳极均连接。
第四晶体管T4的栅极与第二晶体管T2的第二极和OLED的阳极均连接；第一极与第二电压端V2和OLED的阴极均连接；第二极连接第二电容C2的第一端。
第二电容C2的第二端与第一晶体管T1的第二极和第二晶体管T2的栅极均连接。
以上，如图5和图6所示，当扫描信号输入端GATE输入扫描信号，第一晶体管T1打开，数据信号输入端DATA输入数据信号，经第一晶体管T1后输出到第二晶体管T2的栅极，同时向第一电容C1充电。第二晶体管T2为P型晶体管，在高电压信号控制下，第二晶体管T2打开，第一电压端V1的高电压信号经第二晶体管T2输出至OLED的阳极，同时第二电压端V2的低电压信号输出至OLED的阴极，驱动OLED发光。其中，第四晶体管T4为N型晶体管，其在栅极接收到低电压信号后打开，正常显示情况下，OLED的阳极向第四晶体管T4的栅极输出高电压信号，第四晶体管T4截止。
当OLED的阳极和阴极发生短路，阳极上的电位降低，此时，阳极向第四晶体管T4的栅极输出低电压信号，控制第四晶体管T4打开，第二电压端V2上的低电压信号经第四晶体管T4输出至第二 晶体管T2的栅极，在低电压信号控制下，第二晶体管T2截止。第一电压端V1的高电压信号停止向阳极输出，并且第二电压端V2通过第三晶体管T3将数据信号输入端DATA输入到第二电容C2的高电压信号拉低，使数据信号输入端DATA的高电压信号也无法输出到阳极。
本公开实施例还提供一种显示装置，包括上述任一种OLED像素电路。具有与前述实施例提供的OLED像素电路相同的结构和有益效果。由于前述实施例已经对OLED像素电路的结构和有益效果进行了详细的描述，此处不再赘述。
本公开实施例还提供一种上述OLED像素电路的驱动方法，所述驱动方法包括：
扫描信号输入端GATE输入扫描信号，数据信号输入端DATA输入数据信号，驱动模块10驱动发光模块20发光。
若发光模块20发生短路，短路保护模块30控制驱动模块10关闭。
具体的，如图3和图4所示，扫描信号输入端GATE输入扫描信号，控制第一晶体管T1打开；数据信号输入端DATA输入数据信号，控制第二晶体管T2打开，驱动OLED发光。
若OLED正常发光，第一电压端V1经第二晶体管T2输出到阳极上的信号控制第三晶体管T3截止。
若OLED发生短路，第二电压端V2作用到阳极上的信号控制第三晶体管T3打开，第二电压端V2作用到阳极上的信号控制第二晶体管T2截止。
或者，如图5和图6所示，若OLED正常发光，第一电压端V1经第二晶体管T2输出到阳极上的信号控制第四晶体管T4截止。
若OLED发生短路，第二电压端V2作用到阳极上的信号控制第四晶体管T4打开，第二电压端V2上的信号直接控制第二晶体管T2截止。
本公开实施例提供一种OLED像素电路的驱动方法，通过在OLED像素电路中加入短路保护模块30，并且在子像素的发光模块 20正常发光时，短路保护模块30关闭；而当子像素的发光模块20发生短路后，短路保护模块30则开启，并控制驱动模块10关闭，使得第一电压端V1和数据线号输入端DATA的信号无法输出到发光模块20，这样一来，即使发光模块20发生短路，与发光模块20连接的第二电压端V2的信号也不会升高，而是仍然保持其原有的信号强度，从而可避免某一子像素发生短路后影响其周边子像素的正常显示。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (17)

  1. 一种OLED像素电路，其中，包括驱动模块、发光模块、以及短路保护模块；
    所述驱动模块，分别连接扫描信号输入端、数据信号输入端、第一电压端和所述发光模块，用于在所述扫描信号输入端、所述数据信号输入端、和所述第一电压端的控制下，驱动所述发光模块发光；
    所述发光模块还连接第二电压端，用于在所述驱动模块和所述第二电压端的控制下，进行发光；
    所述短路保护模块连接所述驱动模块和所述发光模块，用于在所述发光模块发生短路时，控制所述驱动模块关闭。
  2. 根据权利要求1所述的OLED像素电路，其中，所述驱动模块包括第一晶体管、第一电容和第二晶体管；
    所述第一晶体管的栅极连接所述扫描信号输入端，第一极连接所述数据信号输入端，第二极连接所述第二晶体管的栅极；
    所述第二晶体管的第一极连接所述第一电压端，第二极连接所述发光模块；
    所述第一电容的第一端连接所述第一晶体管的第二极，第二端连接所述第二晶体管的第一极；
    其中，所述第二晶体管为N型晶体管。
  3. 根据权利要求1所述的OLED像素电路，其中，所述驱动模块包括第一晶体管、第一电容和第二晶体管；
    所述第一晶体管的栅极连接所述扫描信号输入端，第一极连接所述数据信号输入端，第二极连接所述第二晶体管的栅极；
    所述第二晶体管的第一极连接所述第一电压端，第二极连接所述发光模块；
    所述第一电容的第一端连接所述第一晶体管的第二极，第二端连接所述第二晶体管的第二极；
    其中，所述第二晶体管为N型晶体管。
  4. 根据权利要求1所述的OLED像素电路，其中，所述发光模块包括OLED，所述OLED的阳极连接所述驱动模块，阴极连接所述 第二电压端。
  5. 根据权利要求1所述的OLED像素电路，其中，所述短路保护模块包括第三晶体管和第二电容；
    所述第三晶体管的栅极和第一极均与所述发光模块和所述驱动模块连接，第二极连接所述第二电容的第一端；
    所述第二电容的第二端连接所述驱动模块；
    其中，所述第三晶体管为P型晶体管。
  6. 根据权利要求5所述的OLED像素电路，其中，所述驱动模块包括第一晶体管、第一电容和第二晶体管；所述发光模块包括OLED；
    所述第三晶体管的栅极和第一极分别与所述第二晶体管的第二极和所述OLED的阳极均连接；
    所述第二电容的第二端与所述第一晶体管的第二极和所述第二晶体管的栅极均连接。
  7. 根据权利要求6所述的OLED像素电路，其中，
    所述第一晶体管的栅极连接所述扫描信号输入端，第一极连接所述数据信号输入端，第二极连接所述第二晶体管的栅极；
    所述第二晶体管的第一极连接所述第一电压端，第二极连接所述发光模块；
    所述第一电容的第一端连接所述第一晶体管的第二极，第二端连接所述第二晶体管的第一极。
  8. 根据权利要求6所述的OLED像素电路，其中，
    所述第一晶体管的栅极连接所述扫描信号输入端，第一极连接所述数据信号输入端，第二极连接所述第二晶体管的栅极；
    所述第二晶体管的第一极连接所述第一电压端，第二极连接所述发光模块；
    所述第一电容的第一端连接所述第一晶体管的第二极，第二端连接所述第二晶体管的第二极。
  9. 根据权利要求1所述的OLED像素电路，其中，所述短路保护模块包括第四晶体管和第二电容；
    所述第四晶体管的栅极与所述发光模块和所述驱动模块均连接，第一极与所述发光模块和所述第二电压端均连接，第二极连接所述第二电容的第一端；
    所述第二电容的第二端连接所述驱动模块；
    其中，所述第四晶体管为P型晶体管。
  10. 根据权利要求9所述的OLED像素电路，其中，所述驱动模块包括第一晶体管、第一电容和第二晶体管；所述发光模块包括OLED；
    所述第四晶体管的栅极与所述第二晶体管的第二极和所述OLED的阳极均连接，第一极与所述OLED的阴极和所述第二电压端均连接；
    所述第二电容的第二端与所述第一晶体管的第二极和所述第二晶体管的栅极均连接。
  11. 根据权利要求10所述的OLED像素电路，其中，
    所述第一晶体管的栅极连接所述扫描信号输入端，第一极连接所述数据信号输入端，第二极连接所述第二晶体管的栅极；
    所述第二晶体管的第一极连接所述第一电压端，第二极连接所述发光模块；
    所述第一电容的第一端连接所述第一晶体管的第二极，第二端连接所述第二晶体管的第一极。
  12. 根据权利要求10所述的OLED像素电路，其中，
    所述第一晶体管的栅极连接所述扫描信号输入端，第一极连接所述数据信号输入端，第二极连接所述第二晶体管的栅极；
    所述第二晶体管的第一极连接所述第一电压端，第二极连接所述发光模块；
    所述第一电容的第一端连接所述第一晶体管的第二极，第二端连接所述第二晶体管的第二极。
  13. 根据权利要求2、3、6、7、8、10、11或12任一项所述的OLED像素电路，其中，所述第一晶体管为N型晶体管。
  14. 一种显示装置，其中，包括权利要求1-13任一项所述的 OLED像素电路。
  15. 一种如权利要求1-13任一项所述的OLED像素电路的驱动方法，其中，所述驱动方法包括：
    扫描信号输入端输入扫描信号，数据信号输入端输入数据信号，驱动模块驱动发光模块发光；
    若发光模块发生短路，短路保护模块控制所述驱动模块关闭。
  16. 根据权利要求15所述的驱动方法，其中，所述驱动方法包括：
    所述扫描信号输入端输入扫描信号，控制第一晶体管打开；所述数据信号输入端输入数据信号，控制第二晶体管打开，驱动OLED发光；
    若所述OLED正常发光，所述第二晶体管输出到阳极上的信号控制第三晶体管截止；
    若所述OLED发生短路，第二电压端作用到所述阳极上的信号控制所述第三晶体管打开，以使所述第二晶体管截止。
  17. 根据权利要求15所述的驱动方法，其中，所述驱动方法包括：
    所述扫描信号输入端输入扫描信号，控制第一晶体管打开；所述数据信号输入端输入数据信号，控制第二晶体管打开，驱动OLED发光；
    若所述OLED正常发光，所述第二晶体管输出到阳极上的信号控制第四晶体管截止；
    若所述OLED发生短路，第二电压端作用到所述阳极上的信号控制所述第四晶体管打开，以使所述第二晶体管截止。
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