WO2020228267A1 - 像素驱动电路以及有机发光二极管显示装置 - Google Patents

像素驱动电路以及有机发光二极管显示装置 Download PDF

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Publication number
WO2020228267A1
WO2020228267A1 PCT/CN2019/116144 CN2019116144W WO2020228267A1 WO 2020228267 A1 WO2020228267 A1 WO 2020228267A1 CN 2019116144 W CN2019116144 W CN 2019116144W WO 2020228267 A1 WO2020228267 A1 WO 2020228267A1
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Prior art keywords
transistor
input
terminal
emitting diode
organic light
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French (fr)
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黄泰钧
王振岭
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • 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
    • G09G2320/046—Dealing with screen burn-in prevention or compensation of the effects thereof

Definitions

  • the present disclosure relates to the field of display technology, in particular to a pixel drive circuit and an organic light emitting diode display device.
  • the voltage across the organic light emitting diode increases due to the aging of the organic light emitting diode, which in turn causes the flow to drive the organic light emitting diode
  • the current of the transistor decreases, affecting the display quality.
  • inverted OLEDs are not easy to implement.
  • the purpose of the present disclosure is to provide a pixel driving circuit and an organic light emitting diode display device, which can solve the problem of a decrease in current flowing through a transistor for driving an organic light emitting diode in the prior art.
  • a pixel driving circuit includes: an organic light-emitting diode, a DC high potential is input to the anode of the organic light-emitting diode; a first transistor, a scan signal is input to the control terminal of the first transistor, The data signal is input to the input terminal of the first transistor; the second transistor, the control terminal of the second transistor is electrically coupled to the output terminal of the first transistor; the third transistor, the pulse signal is input to the first transistor The control terminal of the three transistors, the detection signal is input to the input terminal of the third transistor, the input terminal of the third transistor is electrically coupled to the output terminal of the second transistor; the fourth transistor, the control signal is input to The control terminal of the fourth transistor, the input terminal of the fourth transistor is electrically coupled to the output terminal of the second transistor, and a DC low potential is input to the output terminal of the fourth transistor; and a storage capacitor , Electrically coupled between the output terminal of the first transistor and the output terminal of the second
  • the detection signal is used to detect at least one of the threshold voltage and the mobility of the second transistor.
  • control signal is used to activate the third transistor to detect at least one of the threshold voltage and mobility of the second transistor.
  • a pixel driving circuit includes: an organic light-emitting diode, a DC high potential is input to the anode of the organic light-emitting diode; a first transistor, a scan signal is input to the control terminal of the first transistor, The data signal is input to the input terminal of the first transistor; the second transistor, the control terminal of the second transistor is electrically coupled to the output terminal of the first transistor; the third transistor, the pulse signal is input to the first transistor The control terminal of the three transistors, the detection signal is input to the input terminal of the third transistor, the input terminal of the third transistor is electrically coupled to the output terminal of the second transistor; and the fourth transistor, the control signal is input To the control terminal of the fourth transistor, the input terminal of the fourth transistor is electrically coupled to the output terminal of the second transistor, and the DC low potential is input to the output terminal of the fourth transistor.
  • the pixel driving circuit further includes: a storage capacitor electrically coupled between the output terminal of the first transistor and the output terminal of the second transistor.
  • the pulse signal is used to start detecting or end detecting at least one of the threshold voltage and the mobility of the second transistor.
  • the detection signal is used to detect at least one of the threshold voltage and the mobility of the second transistor.
  • control signal is used to activate the third transistor to detect at least one of the threshold voltage and mobility of the second transistor.
  • an organic light emitting diode display device includes: a plurality of source lines; a plurality of gate lines, the plurality of source lines and the plurality of gate lines define a plurality of pixels At least one source driving unit for providing data signals to the plurality of source lines; at least one gate driving unit for providing scan signals to the plurality of gate lines; a plurality of pixel driving circuits, electrical Is electrically coupled to the plurality of pixels, wherein each of the plurality of pixel driving circuits includes: an organic light-emitting diode, a high voltage direct current is input to the anode of the organic light-emitting diode; a first transistor, the scan signal is input to all The control terminal of the first transistor, the data signal is input to the input terminal of the first transistor; the second transistor, the control terminal of the second transistor is electrically coupled to the output terminal of the first transistor; Three transistors, a pulse signal is input to the control terminal of the third transistor, a detection signal is input
  • the pixel driving circuit further includes: a storage capacitor electrically coupled between the output terminal of the first transistor and the output terminal of the second transistor.
  • the pulse signal is used to start detecting or end detecting at least one of the threshold voltage and the mobility of the second transistor.
  • the detection signal is used to detect at least one of the threshold voltage and the mobility of the second transistor.
  • control signal is used to activate the third transistor to detect at least one of the threshold voltage and mobility of the second transistor.
  • the third transistor and the fourth transistor for detecting at least one of the threshold voltage and mobility of the second transistor are combined with The inverted organic light emitting diode combination enables the organic light emitting diode display device to detect and compensate at least one of the threshold voltage and the mobility of the second transistor. Furthermore, forming the organic light emitting diode by transfer is simpler than the existing manufacturing process.
  • FIG. 1 shows an organic light emitting diode display device according to an embodiment of the present disclosure.
  • FIG. 2 shows a circuit diagram of a pixel driving circuit according to an embodiment of the present disclosure.
  • FIG. 3 shows a schematic diagram of a thin film transistor substrate and an organic light emitting diode according to an embodiment of the present disclosure.
  • FIG. 1 shows an organic light emitting diode display device according to an embodiment of the present disclosure.
  • the organic light emitting diode display device includes a plurality of source lines S1-SN, a plurality of gate lines G1-GM, at least one source driving unit 10 (one source driving unit 10 is shown in the figure), and at least one gate driving Unit 12 (a gate driving unit 12 is shown in the figure).
  • the multiple source lines S1-SN extend to the source driving unit 10.
  • the plurality of gate lines G1-GM extend to the gate driving unit 12.
  • the multiple source lines S1-SN are formed along a first direction.
  • the plurality of gate lines G1-GM are formed along a second direction. The first direction is perpendicular to the second direction.
  • the plurality of source lines S1-SN and the plurality of gate lines G1-GM define a plurality of pixels 14.
  • the source driving unit 10 is electrically connected to the multiple source lines S1-SN and is used to provide data signals to the multiple source lines S1-SN, and the data signals are used to write into the pixels 14 .
  • the gate driving unit 12 is electrically connected to the plurality of gate lines G1-GM and used to provide scan signals to the plurality of gate lines G1-GM.
  • FIG. 2 shows a circuit diagram of a pixel driving circuit according to an embodiment of the present disclosure.
  • the pixel driving circuit is used to drive one pixel 14 of FIG. 1. That is to say, the organic light emitting diode display device includes a plurality of pixel driving circuits electrically coupled to the plurality of pixels 14 and having a one-to-one correspondence relationship with the plurality of pixels 14.
  • the pixel driving circuit includes an organic light emitting diode D1, a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, and a storage capacitor CS.
  • the scan signal SS provided by the gate driving unit 12 is input to the control terminal of the first transistor T1.
  • the data signal DS provided by the source driving unit 10 is input to the input terminal of the first transistor T1.
  • the control terminal of the second transistor T2 is electrically coupled to the output terminal of the first transistor T1.
  • the direct current high potential OVDD is input to the anode 30 of the organic light emitting diode D1.
  • the cathode 32 of the organic light emitting diode D1 is electrically coupled to the input terminal of the second transistor T2.
  • the organic light emitting diode D1 is an inverted organic light emitting diode. OLED).
  • the anode 30 of the organic light emitting diode D1 is disposed above the cathode 32 (as shown in FIG. 3).
  • the organic light emitting diode D1 is electrically coupled between the DC high potential OVDD and the input terminal of the second transistor T2.
  • the pulse signal SEN is input to the control terminal of the third transistor T3.
  • the detection signal ES is input to the input terminal of the third transistor T3.
  • the input terminal of the third transistor T3 is electrically coupled to the output terminal of the second transistor T2.
  • the third transistor T3 is used to detect at least one of a threshold voltage and a mobility of the second transistor T2.
  • the pulse signal SEN is used to start or end detecting at least one of a threshold voltage and a mobility of the second transistor T2.
  • the pulse signal SEN may be the scan signal SS provided by the gate driving unit 12.
  • the detection signal ES is used to detect at least one of the threshold voltage and the mobility of the second transistor T2.
  • the control signal CTRL is input to the control terminal of the fourth transistor T4.
  • the input terminal of the fourth transistor T4 is electrically coupled to the output terminal of the second transistor T2.
  • the DC low potential OVSS is input to the output terminal of the fourth transistor T4.
  • the control signal CTRL is used to activate the third transistor T3 to detect at least one of the threshold voltage and the mobility of the second transistor T2.
  • the storage capacitor CS is electrically coupled between the output terminal of the first transistor T1 and the output terminal of the second transistor T2.
  • the storage capacitor CS is used to store the data signal DS.
  • the second transistor T2 can keep the organic light emitting diode D1 emitting light.
  • the control signal CTRL is at a high level
  • the first transistor T1 and the fourth transistor T4 are turned on
  • the voltage of the node A is VA, the DC low level OVSS .
  • Vth is the threshold voltage of the second transistor T2. It can be seen from the above that the current I is not affected by the voltage across the organic light emitting diode D1, so it can be ensured that the organic light emitting diode D1 is in a constant current state.
  • the fourth transistor T4 When the control signal CTRL is at a low level, the fourth transistor T4 is not turned on.
  • the pulse signal SEN turns on the third transistor T3
  • the detection signal ES detects at least one of the threshold voltage and the mobility of the second transistor T2 and stores the detection result.
  • the organic light emitting diode display device can perform compensation according to the detection result.
  • One of the features of the present disclosure is to combine the third transistor T3 and the fourth transistor T4 for detecting at least one of the threshold voltage and mobility of the second transistor T2 with the inverted organic light emitting diode D1, so that the The organic light emitting diode display device can detect and compensate at least one of the threshold voltage and the mobility of the second transistor T2.
  • the detection and compensation process it is well known to those of ordinary skill in the art, so it will not be repeated here.
  • FIG. 3 shows a schematic diagram of a thin film transistor substrate and an organic light emitting diode according to an embodiment of the present disclosure.
  • the organic light emitting diode D1 is formed on the thin film transistor substrate 20 by transfer after the thin film transistor substrate 20 is manufactured. Forming the organic light emitting diode D1 by transfer is simpler than the existing manufacturing process.
  • the manufacturing process of the thin film transistor substrate 20 is well known to those of ordinary skill in the art, and will not be repeated here.
  • a third transistor and a fourth transistor for detecting at least one of the threshold voltage and mobility of the second transistor are combined with an inverted organic light emitting diode , So that the organic light emitting diode display device can detect and compensate at least one of the threshold voltage and the mobility of the second transistor. Furthermore, forming the organic light emitting diode by transfer is simpler than the existing manufacturing process.

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

Abstract

一种像素驱动电路，包括：有机发光二极管，直流高电位输入至所述有机发光二极管的阳极；第一晶体管，扫描信号输入至所述第一晶体管的控制端，数据信号输入至所述第一晶体管的输入端；第二晶体管；第三晶体管，脉冲信号输入至所述第三晶体管的控制端，侦测信号输入至所述第三晶体管的输入端；以及第四晶体管，控制信号输入至所述第四晶体管的控制端，直流低电位输入至所述第四晶体管的输出端。还提供一种有机发光二极管显示装置。

Description

像素驱动电路以及有机发光二极管显示装置 技术领域
本揭示涉及显示技术领域，特别是涉及一种像素驱动电路以及有机发光二极管显示装置。
 背景技术
现有的有机发光二极管（Organic Light Emitting Diode，OLED）显示装置的像素驱动电路中，由于有机发光二极管会老化，造成有机发光二极管两端的电压提高，进而使得流过用于驱动所述有机发光二极管的晶体管的电流降低，影响显示质量。
另外，受限于现有的有机发光二极管显示装置的制程，倒置式的有机发光二极管（inverted OLED）并不容易实现。
因此需要对现有技术中的问题提出解决方法。
 技术问题
本揭示的目的在于提供一种像素驱动电路以及有机发光二极管显示装置，其能解决现有技术中流过用于驱动有机发光二极管的晶体管的电流降低的问题。
 技术解决方案
为解决上述问题，本揭示提供的一种像素驱动电路包括：有机发光二极管，直流高电位输入至所述有机发光二极管的阳极；第一晶体管，扫描信号输入至所述第一晶体管的控制端，数据信号输入至所述第一晶体管的输入端；第二晶体管，所述第二晶体管的控制端电性耦接至所述第一晶体管的输出端；第三晶体管，脉冲信号输入至所述第三晶体管的控制端，侦测信号输入至所述第三晶体管的输入端，所述第三晶体管的输入端电性耦接至所述第二晶体管的输出端；第四晶体管，控制信号输入至所述第四晶体管的控制端，所述第四晶体管的输入端电性耦接至所述第二晶体管的所述输出端，直流低电位输入至所述第四晶体管的输出端；以及存储电容，电性耦接于所述第一晶体管的所述输出端与所述第二晶体管的所述输出端之间，其中所述脉冲信号用于开始侦测或结束侦测所述第二晶体管的阈值电压及迁移率的至少一者，所述有机发光二极管为倒置式的有机发光二极管。
于一实施例中，所述侦测信号用于侦测所述第二晶体管的阈值电压及迁移率的至少一者。
于一实施例中，所述控制信号用于启动所述第三晶体管去侦测所述第二晶体管的阈值电压及迁移率的至少一者。
为解决上述问题，本揭示提供的一种像素驱动电路包括：有机发光二极管，直流高电位输入至所述有机发光二极管的阳极；第一晶体管，扫描信号输入至所述第一晶体管的控制端，数据信号输入至所述第一晶体管的输入端；第二晶体管，所述第二晶体管的控制端电性耦接至所述第一晶体管的输出端；第三晶体管，脉冲信号输入至所述第三晶体管的控制端，侦测信号输入至所述第三晶体管的输入端，所述第三晶体管的输入端电性耦接至所述第二晶体管的输出端；以及第四晶体管，控制信号输入至所述第四晶体管的控制端，所述第四晶体管的输入端电性耦接至所述第二晶体管的所述输出端，直流低电位输入至所述第四晶体管的输出端。
于一实施例中，所述的像素驱动电路进一步包括：存储电容，电性耦接于所述第一晶体管的所述输出端与所述第二晶体管的所述输出端之间。
于一实施例中，所述脉冲信号用于开始侦测或结束侦测所述第二晶体管的阈值电压及迁移率的至少一者。
于一实施例中，所述侦测信号用于侦测所述第二晶体管的阈值电压及迁移率的至少一者。
于一实施例中，所述控制信号用于启动所述第三晶体管去侦测所述第二晶体管的阈值电压及迁移率的至少一者。
为解决上述问题，本揭示提供的一种有机发光二极管显示装置包括：多条源极线；多条栅极线，所述多条源极线及所述多条栅极线定义出多个像素；至少一源极驱动单元，用于向所述多条源极线提供数据信号；至少一栅极驱动单元，用于向所述多条栅极线提供扫描信号；多个像素驱动电路，电性耦接至所述多个像素，其中每一所述多个像素驱动电路包括：有机发光二极管，直流高电位输入至所述有机发光二极管的阳极；第一晶体管，所述扫描信号输入至所述第一晶体管的控制端，所述数据信号输入至所述第一晶体管的输入端；第二晶体管，所述第二晶体管的控制端电性耦接至所述第一晶体管的输出端；第三晶体管，脉冲信号输入至所述第三晶体管的控制端，侦测信号输入至所述第三晶体管的输入端，所述第三晶体管的输入端电性耦接至所述第二晶体管的输出端；以及第四晶体管，控制信号输入至所述第四晶体管的控制端，所述第四晶体管的输入端电性耦接至所述第二晶体管的所述输出端，直流低电位输入至所述第四晶体管的输出端。
于一实施例中，所述的像素驱动电路进一步包括：存储电容，电性耦接于所述第一晶体管的所述输出端与所述第二晶体管的所述输出端之间。
于一实施例中，所述脉冲信号用于开始侦测或结束侦测所述第二晶体管的阈值电压及迁移率的至少一者。
于一实施例中，所述侦测信号用于侦测所述第二晶体管的阈值电压及迁移率的至少一者。
于一实施例中，所述控制信号用于启动所述第三晶体管去侦测所述第二晶体管的阈值电压及迁移率的至少一者。
 有益效果
相较于现有技术，本揭示之像素驱动电路以及有机发光二极管显示装置中，将用于侦测所述第二晶体管的阈值电压及迁移率的至少一者的第三晶体管及第四晶体管与倒置式的有机发光二极管结合，使得所述有机发光二极管显示装置能对所述第二晶体管的阈值电压及迁移率的至少一者进行侦测及补偿。再者，以转印的方式形成所述有机发光二极管比起现有制程更加简单。
 附图说明
图1显示根据本揭示一实施例之有机发光二极管显示装置。
图2显示根据本揭示一实施例之像素驱动电路的电路图。
图3显示根据本揭示一实施例之薄膜晶体管基板与有机发光二极管的示意图。
 本发明的实施方式
以下各实施例的说明是参考附加的图式，用以例示本揭示可用以实施的特定实施例。
请参阅图1，图1显示根据本揭示一实施例之有机发光二极管显示装置。
所述有机发光二极管显示装置包括多条源极线S1-SN、多条栅极线G1-GM、至少一源极驱动单元10（图中显示一个源极驱动单元10）以及至少一栅极驱动单元12（图中显示一个栅极驱动单元12）。
所述多条源极线S1-SN并延伸至所述源极驱动单元10。所述多条栅极线G1-GM延伸至所述栅极驱动单元12。所述多条源极线S1-SN沿一第一方向形成。所述多条栅极线G1-GM沿一第二方向形成。所述第一方向垂直于所述第二方向。所述多条源极线S1-SN及所述多条栅极线G1-GM定义出多个像素14。
所述源极驱动单元10电性连接至所述多条源极线S1-SN并用于向所述多条源极线S1-SN提供数据信号，所述数据信号用于写入所述像素14。
所述栅极驱动单元12电性连接至所述多条栅极线G1-GM并用于向所述多条栅极线G1-GM提供扫描信号。
请参阅图1及图2，图2显示根据本揭示一实施例之像素驱动电路的电路图。
所述像素驱动电路用于驱动图1的一个像素14。也就是说，所述有机发光二极管显示装置包括多个像素驱动电路电性耦接至所述多个像素14且与所述多个像素14具有一对一的对应的关系。
所述像素驱动电路包括有机发光二极管D1、第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4以及存储电容CS。
所述栅极驱动单元12提供的扫描信号SS输入至所述第一晶体管T1的控制端。所述源极驱动单元10提供的数据信号DS输入至所述第一晶体管T1的输入端。
所述第二晶体管T2的控制端电性耦接至所述第一晶体管T1的输出端。
直流高电位OVDD输入至所述有机发光二极管D1的阳极30。所述有机发光二极管D1的阴极32电性耦接至所述第二晶体管T2的输入端。本揭示之有机发光二极管显示装置中，所述有机发光二极管D1为倒置式的有机发光二极管（inverted OLED）。也就是说，所述有机发光二极管D1的阳极30设置于阴极32的上方（如图3所示）。换言之，所述有机发光二极管D1电性耦接于所述直流高电位OVDD与所述第二晶体管T2的输入端之间。
脉冲信号SEN输入至所述第三晶体管T3的控制端。侦测信号ES输入至所述第三晶体管T3的输入端。所述第三晶体管T3的输入端电性耦接至所述第二晶体管T2的输出端。所述第三晶体管T3用于侦测所述第二晶体管T2的阈值电压（threshold voltage）及迁移率（mobility）的至少一者。所述脉冲信号SEN用于开始侦测或结束侦测所述第二晶体管T2的阈值电压（threshold voltage）及迁移率（mobility）的至少一者。于一实施例中，所述脉冲信号SEN可以为所述栅极驱动单元12提供的扫描信号SS。所述侦测信号ES用于侦测所述第二晶体管T2的阈值电压及迁移率的至少一者。
控制信号CTRL输入至所述第四晶体管T4的控制端。所述第四晶体管T4的输入端电性耦接至所述第二晶体管T2的所述输出端。直流低电位OVSS输入至所述第四晶体管T4的输出端。所述控制信号CTRL用于启动所述第三晶体管T3去侦测所述第二晶体管T2的阈值电压及迁移率的至少一者。
所述存储电容CS电性耦接于所述第一晶体管T1的所述输出端与所述第二晶体管T2的所述输出端之间。所述存储电容CS用于存储所述数据信号DS，当所述第一晶体管T1不导通时，所述第二晶体管T2能使所述有机发光二极管D1维持发光。
当所述有机发光二极管显示装置正常显示影像时，所述控制信号CTRL为高电位，所述第一晶体管T1及所述第四晶体管T4导通，节点A的电压为VA所述直流低电位OVSS。流过所述第二晶体管T2的电流I=K((VB-VA)-Vth) 2=K((VB-OVSS)-Vth) 2。Vth为所述第二晶体管T2的阈值电压。由上述可知，所述电流I不受所述有机发光二极管D1两端的电压的影响，因此可以确保所述有机发光二极管D1为恒流状态。
当所述控制信号CTRL为低电位时，所述第四晶体管T4不导通。当所述脉冲信号SEN导通所述第三晶体管T3时，所述侦测信号ES侦测所述第二晶体管T2的阈值电压及迁移率的至少一者并存储侦测结果。所述有机发光二极管显示装置可以根据侦测结果进行补偿。
本揭示之一特点在于将用于侦测所述第二晶体管T2的阈值电压及迁移率的至少一者的第三晶体管T3及第四晶体管T4与倒置式的有机发光二极管D1结合，使得所述有机发光二极管显示装置能对所述第二晶体管T2的阈值电压及迁移率的至少一者进行侦测及补偿。至于侦测及补偿过程为本领域的普通技术人员所熟知，于此不多加赘述。
请参阅图3，图3显示根据本揭示一实施例之薄膜晶体管基板与有机发光二极管的示意图。
本揭示之另一特点在于所述有机发光二极管D1是在所述薄膜晶体管基板20制作完成后，以转印的方式形成在所述薄膜晶体管基板20上。以转印的方式形成所述有机发光二极管D1比起现有制程更加简单。所述薄膜晶体管基板20的制程为本领域的普通技术人员所熟知，于此不多加赘述。
本揭示之像素驱动电路以及有机发光二极管显示装置中，将用于侦测所述第二晶体管的阈值电压及迁移率的至少一者的第三晶体管及第四晶体管与倒置式的有机发光二极管结合，使得所述有机发光二极管显示装置能对所述第二晶体管的阈值电压及迁移率的至少一者进行侦测及补偿。再者，以转印的方式形成所述有机发光二极管比起现有制程更加简单。
综上所述，虽然本揭示已以优选实施例揭露如上，但上述优选实施例并非用以限制本揭示，本领域的普通技术人员在不脱离本揭示的精神和范围内，均可作各种更动与润饰，因此本揭示的保护范围以权利要求界定的范围为准。

Claims (13)

  1. 一种像素驱动电路，包括：
    有机发光二极管，直流高电位输入至所述有机发光二极管的阳极；
    第一晶体管，扫描信号输入至所述第一晶体管的控制端，数据信号输入至所述第一晶体管的输入端；
    第二晶体管，所述第二晶体管的控制端电性耦接至所述第一晶体管的输出端；
    第三晶体管，脉冲信号输入至所述第三晶体管的控制端，侦测信号输入至所述第三晶体管的输入端，所述第三晶体管的输入端电性耦接至所述第二晶体管的输出端；
    第四晶体管，控制信号输入至所述第四晶体管的控制端，所述第四晶体管的输入端电性耦接至所述第二晶体管的所述输出端，直流低电位输入至所述第四晶体管的输出端；以及
    存储电容，电性耦接于所述第一晶体管的所述输出端与所述第二晶体管的所述输出端之间，
    其中所述脉冲信号用于开始侦测或结束侦测所述第二晶体管的阈值电压及迁移率的至少一者，所述有机发光二极管为倒置式的有机发光二极管。
  2. 根据权利要求1所述的像素驱动电路，其中所述侦测信号用于侦测所述第二晶体管的阈值电压及迁移率的至少一者。
  3. 根据权利要求1所述的像素驱动电路，其中所述控制信号用于启动所述第三晶体管去侦测所述第二晶体管的阈值电压及迁移率的至少一者。
  4. 一种像素驱动电路，包括：
    有机发光二极管，直流高电位输入至所述有机发光二极管的阳极；
    第一晶体管，扫描信号输入至所述第一晶体管的控制端，数据信号输入至所述第一晶体管的输入端；
    第二晶体管，所述第二晶体管的控制端电性耦接至所述第一晶体管的输出端；
    第三晶体管，脉冲信号输入至所述第三晶体管的控制端，侦测信号输入至所述第三晶体管的输入端，所述第三晶体管的输入端电性耦接至所述第二晶体管的输出端；以及
    第四晶体管，控制信号输入至所述第四晶体管的控制端，所述第四晶体管的输入端电性耦接至所述第二晶体管的所述输出端，直流低电位输入至所述第四晶体管的输出端。
  5. 根据权利要求4所述的像素驱动电路，进一步包括：
    存储电容，电性耦接于所述第一晶体管的所述输出端与所述第二晶体管的所述输出端之间。
  6. 根据权利要求4所述的像素驱动电路，其中所述脉冲信号用于开始侦测或结束侦测所述第二晶体管的阈值电压及迁移率的至少一者。
  7. 根据权利要求4所述的像素驱动电路，其中所述侦测信号用于侦测所述第二晶体管的阈值电压及迁移率的至少一者。
  8. 根据权利要求4所述的像素驱动电路，其中所述控制信号用于启动所述第三晶体管去侦测所述第二晶体管的阈值电压及迁移率的至少一者。
  9. 一种有机发光二极管显示装置，包括：
    多条源极线；
    多条栅极线，所述多条源极线及所述多条栅极线定义出多个像素；
    至少一源极驱动单元，用于向所述多条源极线提供数据信号；
    至少一栅极驱动单元，用于向所述多条栅极线提供扫描信号；
    多个像素驱动电路，电性耦接至所述多个像素，
    其中每一所述多个像素驱动电路包括：
    有机发光二极管，直流高电位输入至所述有机发光二极管的阳极；
    第一晶体管，所述扫描信号输入至所述第一晶体管的控制端，所述数据信号输入至所述第一晶体管的输入端；
    第二晶体管，所述第二晶体管的控制端电性耦接至所述第一晶体管的输出端；
    第三晶体管，脉冲信号输入至所述第三晶体管的控制端，侦测信号输入至所述第三晶体管的输入端，所述第三晶体管的输入端电性耦接至所述第二晶体管的输出端；以及
    第四晶体管，控制信号输入至所述第四晶体管的控制端，所述第四晶体管的输入端电性耦接至所述第二晶体管的所述输出端，直流低电位输入至所述第四晶体管的输出端。
  10. 根据权利要求9所述的有机发光二极管显示装置，进一步包括：
    存储电容，电性耦接于所述第一晶体管的所述输出端与所述第二晶体管的所述输出端之间。
  11. 根据权利要求9所述的有机发光二极管显示装置，其中所述脉冲信号用于开始侦测或结束侦测所述第二晶体管的阈值电压及迁移率的至少一者。
  12. 根据权利要求9所述的有机发光二极管显示装置，其中所述侦测信号用于侦测所述第二晶体管的阈值电压及迁移率的至少一者。
  13. 根据权利要求9所述的有机发光二极管显示装置，其中所述控制信号用于启动所述第三晶体管去侦测所述第二晶体管的阈值电压及迁移率的至少一者。
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