WO2020168592A1 - Oled像素驱动电路和oled显示器 - Google Patents

Oled像素驱动电路和oled显示器 Download PDF

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Publication number
WO2020168592A1
WO2020168592A1 PCT/CN2019/077062 CN2019077062W WO2020168592A1 WO 2020168592 A1 WO2020168592 A1 WO 2020168592A1 CN 2019077062 W CN2019077062 W CN 2019077062W WO 2020168592 A1 WO2020168592 A1 WO 2020168592A1
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Prior art keywords
thin film
film transistor
signal
module
reset
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PCT/CN2019/077062
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English (en)
French (fr)
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李新吉
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深圳市华星光电半导体显示技术有限公司
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Publication of WO2020168592A1 publication Critical patent/WO2020168592A1/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
    • 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

Definitions

  • This application relates to the field of electronic display, and in particular to an OLED pixel drive circuit and an OLED display.
  • OLED Organic Light Emitting Diode
  • the driving transistor is usually made of semiconductor materials such as amorphous silicon, polysilicon or metal oxide. Limited by the manufacturing process, the current threshold voltage, mobility and other electrical parameters of each driving crystal of an OLED pixel are often different, which causes uneven brightness and affects display quality.
  • the present application provides an OLED pixel driving circuit and an OLED display to eliminate the influence of threshold voltage drift on the display brightness of the display.
  • the present application provides an OLED pixel drive circuit, which includes a light emitting module, a compensation module, a reset module, and a signal input module; wherein the reset module is used to provide a reset for the light emitting module when the reset signal is valid.
  • the compensation module is used to provide compensation voltage for the light-emitting module when the compensation signal is valid;
  • the signal input module is used to provide input data signals for the light-emitting module;
  • the light-emitting module is used to reset according to the The signal is reset, and light is emitted according to the instruction of the compensation signal and the input data signal after the reset.
  • the light emitting module includes an active light emitting diode and a first thin film transistor, wherein the current outlet end of the active light emitting diode is connected to the second power supply voltage, and the current inlet end of the active light emitting diode is connected to the first The source of the thin film transistor; the gate of the first thin film transistor is connected to a light-emitting signal, and the drain is connected to the compensation module.
  • the compensation module includes a second thin film transistor and a third thin film transistor, wherein the drain of the second thin film transistor and the source of the third thin film transistor are connected to the first thin film transistor.
  • the source of the transistor; the gate of the second thin film transistor and the drain of the third thin film transistor are connected to the reset module and the signal input module; the drain of the second thin film transistor is connected to the first power supply voltage;
  • the gate of the third thin film transistor is connected to the compensation signal.
  • the reset module includes a fourth thin film transistor, wherein the drain of the fourth thin film transistor is connected to the compensation module; the gate of the fourth thin film transistor is connected to the reset signal, and the source Connect the reset voltage.
  • the signal input module includes a fifth thin film transistor, a sixth thin film transistor, and a driving capacitor, wherein the first plate of the driving capacitor is connected to the compensation module and the reset module, and the second electrode
  • the board is connected to the sources of the fifth and sixth thin film transistors; the gates of the fifth and sixth thin film transistors are connected to light-emitting signals; the drain of the sixth thin film transistor is connected to input data signals; The drain of the fifth thin film transistor is connected to the first power supply voltage.
  • the first thin film transistor, the second thin film transistor, the third thin film transistor, the fourth thin film transistor, and the fifth thin film transistor are P-type thin film transistors
  • the sixth thin film transistor is an N-type thin film transistor. Transistor.
  • the input data signal is at a high level
  • the reset signal is at a low level
  • the compensation signal is at a high level
  • the The light-emitting signal is at a high level; at this time, the signal input module and the compensation module are turned off, and the light-emitting module is reset according to the reset signal.
  • the OLED pixel drive circuit when the OLED pixel drive circuit is in a compensation state, the input data signal is at a high level, the reset signal is at a high level, the compensation signal is at a low level, and the The light-emitting signal is at a high level; at this time, the signal input module and the reset module are turned off, and the light-emitting module compensates the voltage of the source of the first thin film transistor according to the compensation signal.
  • the OLED pixel drive circuit when the OLED pixel drive circuit is in a light-emitting state, the input data signal is at a low level, the reset signal is at a high level, the compensation signal is at a low level, and the The light-emitting signal is low level; at this time, the compensation module and the reset module are turned off, and the light-emitting module emits light according to the instruction of the input data signal.
  • the present application also provides an OLED display, which includes an OLED pixel drive circuit.
  • the OLED pixel drive circuit includes a light emitting module, a compensation module, a reset module, and a signal input module; wherein the reset module is used for When the reset signal is valid, provide a reset voltage for the light-emitting module; the compensation module is used to provide a compensation voltage for the light-emitting module when the compensation signal is valid; the signal input module is used to provide input data for the light-emitting module Signal; the light-emitting module is used to reset according to the reset signal, and after the reset according to the compensation signal and input data signal instructions to emit light.
  • the light emitting module includes an active light emitting diode and a first thin film transistor, wherein the current outlet end of the active light emitting diode is connected to the second power supply voltage, and the current inlet end of the active light emitting diode is connected to the first The source of the thin film transistor; the gate of the first thin film transistor is connected to a light-emitting signal, and the drain is connected to the compensation module.
  • the compensation module includes a second thin film transistor and a third thin film transistor, wherein the drain of the second thin film transistor and the source of the third thin film transistor are connected to the first thin film transistor.
  • the source of the transistor; the gate of the second thin film transistor and the drain of the third thin film transistor are connected to the reset module and the signal input module; the drain of the second thin film transistor is connected to the first power supply voltage;
  • the gate of the third thin film transistor is connected to the compensation signal.
  • the reset module includes a fourth thin film transistor, wherein the drain of the fourth thin film transistor is connected to the compensation module; the gate of the fourth thin film transistor is connected to the reset signal, and the source Connect the reset voltage.
  • the signal input module includes a fifth thin film transistor, a sixth thin film transistor, and a driving capacitor, wherein the first plate of the driving capacitor is connected to the compensation module and the reset module, and the second electrode
  • the board is connected to the sources of the fifth and sixth thin film transistors; the gates of the fifth and sixth thin film transistors are connected to light-emitting signals; the drain of the sixth thin film transistor is connected to input data signals; The drain of the fifth thin film transistor is connected to the first power supply voltage.
  • the first thin film transistor, the second thin film transistor, the third thin film transistor, the fourth thin film transistor, and the fifth thin film transistor are P-type thin film transistors
  • the sixth thin film transistor is an N-type thin film transistor. Transistor.
  • the input data signal is at a high level
  • the reset signal is at a low level
  • the compensation signal is at a high level
  • the The light-emitting signal is at a high level; at this time, the signal input module and the compensation module are turned off, and the light-emitting module is reset according to the reset signal.
  • the OLED pixel drive circuit when the OLED pixel drive circuit is in a compensation state, the input data signal is at a high level, the reset signal is at a high level, the compensation signal is at a low level, and the The light-emitting signal is at a high level; at this time, the signal input module and the reset module are turned off, and the light-emitting module compensates the voltage of the source of the first thin film transistor according to the compensation signal.
  • the OLED pixel drive circuit when the OLED pixel drive circuit is in a light-emitting state, the input data signal is at a low level, the reset signal is at a high level, the compensation signal is at a low level, and the The light-emitting signal is low; at this time, the compensation module and the reset module are turned off, and the light-emitting module emits light according to the instruction of the input data signal.
  • the pixel drive circuit provided by this application can not only eliminate the impact of threshold voltage drift on the brightness of the OLED display screen, but also the layout of the circuit does not need to introduce additional data lines. Under the condition that the number of transistors remains unchanged, this application has the smallest The layout area can minimize the manufacturing cost and process complexity of the driving circuit.
  • FIG. 1 is a circuit diagram of a pixel driving circuit in a specific embodiment of the application
  • FIG. 2 is a timing diagram of various signals in the pixel driving circuit in FIG. 1.
  • the present application provides an OLED pixel driving circuit and an OLED display to eliminate the influence of threshold voltage drift on the display brightness of the display.
  • the application will be described in detail below with reference to the drawings and specific embodiments.
  • the present application provides an OLED pixel driving circuit, which includes a light-emitting module, a compensation module, a reset module, and a signal input module.
  • the reset module is used to provide a reset voltage for the light-emitting module when the reset signal is valid.
  • the compensation module is used to provide a compensation voltage for the light-emitting module when the compensation signal is valid.
  • the signal input module is used to provide input data signals for the light emitting module.
  • the light-emitting module is used to reset according to the reset signal, and emit light according to the instruction of the compensation signal and the input data signal after the reset.
  • the light emitting module includes an active light emitting diode D1 and a first thin film transistor T1, wherein the current outlet end of the active light emitting diode D1 is connected to the second power supply voltage Vss, and the current inlet end is connected to the The source of the first thin film transistor T1; the gate of the first thin film transistor T1 is connected to the light emitting signal EM, and the drain is connected to the compensation module.
  • the compensation module includes a second thin film transistor T2 and a third thin film transistor, wherein the drain of the second thin film transistor T2 and the source of the third thin film transistor T3 are connected to the source of the first thin film transistor T1
  • the gate of the second thin film transistor T2 and the drain of the third thin film transistor T3 are connected to the reset module and the signal input module; the drain of the second thin film transistor T2 is connected to the first power supply voltage Vdd;
  • the gate of the third thin film transistor T3 is connected to the compensation signal Gate.
  • the reset module includes a fourth thin film transistor T4, wherein the drain of the fourth thin film transistor T4 is connected to the compensation module; the gate of the fourth thin film transistor T4 is connected to the reset signal Reset, and the source is connected to the reset voltage int .
  • the signal input module includes a fifth thin film transistor T5, a sixth thin film transistor T6 and a driving capacitor C, wherein the first plate of the driving capacitor C is connected to the compensation module and the reset module, and the second plate is connected to the The source of the fifth thin film transistor T5 and the sixth thin film transistor T6; the gates of the fifth thin film transistor T5 and the sixth thin film transistor T6 are connected to the light emitting signal EM; the drain of the sixth thin film transistor T6 is connected to the input data signal Date; The drain of the fifth thin film transistor T5 is connected to the first power supply voltage Vdd.
  • the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3, the fourth thin film transistor T4, and the fifth thin film transistor T5 are P-type thin film transistors, and their threshold voltage is low level.
  • the sixth thin film transistor T6 is an N-type thin film transistor, and its threshold voltage is a high level.
  • the driving circuit is in a reset state.
  • the input data signal Date is at a high level
  • the reset signal Reset is at a low level
  • the compensation signal Gate is at a high level
  • the light-emitting signal EM is at a high level.
  • the signal input module and the compensation module are turned off, and the light emitting module is reset according to the reset signal Reset.
  • the fourth thin film transistor T4 and the sixth thin film transistor T6 are turned on, and the remaining thin film transistors are turned off. That is, the voltage of the first plate of the driving capacitor C is equal to the input data signal Date, and the voltage of the second plate is equal to the reset voltage int (low level), and the reset of the driving capacitor is completed.
  • the driving circuit is in a compensation state.
  • the input data signal Date is at a high level
  • the reset signal Reset is at a high level
  • the compensation signal Gate is at a low level
  • the light-emitting signal EM is at a high level.
  • the signal input module and the reset module are turned off, and the light emitting module compensates the voltage of the source of the first thin film transistor T1 according to the compensation signal Gate.
  • the second thin film transistor T2, the third thin film transistor T3, and the sixth thin film transistor T6 are turned on, and the remaining thin film transistors are turned off. That is, the voltage of the first plate of the driving capacitor C is equal to the input data signal Date, and the first power supply voltage Vdd charges the driving capacitor C through the second thin film transistor T2.
  • the second thin film transistor T2 is turned off. At this time, the voltage of the first plate of the driving capacitor C is equal to the input data signal Date, and the voltage of the second plate is equal to V dd -
  • the input data signal Date is at a low level
  • the reset signal Reset is at a high level
  • the compensation signal Gate is at a low level
  • the light-emitting signal EM is low level.
  • the compensation module and the reset module are turned off, and the light-emitting module emits light according to the instruction of the input data signal Date.
  • the first thin film transistor T1 and the fifth thin film transistor T5 are turned on, the other thin film transistors are turned off, and the gate voltage of the first thin film transistor T1 is equal to V dd -
  • the current of the active light emitting diode D1 satisfies the following conditions:
  • ⁇ is the carrier mobility
  • COX is the gate oxide capacitance
  • V dd is the power supply voltage
  • V data is the voltage of the control data line.
  • the current of the active light emitting diode D1 is only related to the input data signal Date, which effectively eliminates the influence of the drift of the threshold voltage of the thin film transistor on the light emitting state of the circuit.
  • the present application also provides an OLED display, which includes the OLED pixel driving circuit as described in the preceding item.
  • the pixel drive circuit provided by this application can not only eliminate the impact of threshold voltage drift on the brightness of the OLED display screen, but also the layout of the circuit does not need to introduce additional data lines. Under the condition that the number of transistors remains unchanged, this application has the smallest The layout area can minimize the manufacturing cost and process complexity of the driving circuit.

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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 El Displays (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

一种OLED像素驱动电路和OLED显示器。OLED像素驱动电路包括发光模块、补偿模块、复位模块和信号输入模块；其中，复位模块用于在复位信号有效时，为发光模块提供复位电压；补偿模块用于在补偿信号有效时，为发光模块提供补偿电压；信号输入模块用于为发光模块提供输入数据信号；发光模块用于根据复位信号进行复位，并在复位之后根据补偿信号和输入数据信号的指令发光。该驱动电路能消除阈值电压漂移对显示器的显示亮度的影响。

Description

[根据细则37.2由ISA制定的发明名称]　OLED像素驱动电路和OLED显示器 技术领域
本申请涉及电子显示领域，尤其涉及一种OLED像素驱动电路和OLED显示器。
 背景技术
有机发光二极管(Organic Light Emitting Diode，OLED)是一种应用于电视和移动设备中的显示技术。相比于现有主流的液晶显示器，OLED显示器具有高对比度、广视角、低功耗、体积更薄等优点，是目前最受关注的显示技术之一。
 技术问题
现有的OLED显示器中，驱动晶体管通常由非晶硅、多晶硅或金属氧化物等半导体材料制成。受限于制造工艺，OLED像素的各个驱动晶体的现阈值电压、迁移率等电学参数往往并不相同，进而造成亮度不均、影响显示画质。
 技术解决方案
本申请提供一种OLED像素驱动电路和OLED显示器，以消除阈值电压漂移对显示器的显示亮度的影响。
一方面，本申请提供了一种OLED像素驱动电路，其包括发光模块、补偿模块、复位模块和信号输入模块；其中，所述复位模块用于在复位信号有效时，为所述发光模块提供复位电压；所述补偿模块用于在补偿信号有效时，为所述发光模块提供补偿电压；所述信号输入模块用于为所述发光模块提供输入数据信号；所述发光模块用于根据所述复位信号进行复位，并在复位之后根据所述补偿信号和输入数据信号的指令发光。
根据本申请的其中一个方面，所述发光模块包括有源发光二极管和第一薄膜晶体管，其中，所述有源发光二极管的电流出口端连接第二电源电压，其电流入口端连接所述第一薄膜晶体管的源极；所述第一薄膜晶体管的栅极连接发光信号，漏极连接所述补偿模块。
根据本申请的其中一个方面，所述补偿模块包括第二薄膜晶体管和第三薄膜晶体管，其中，所述第二薄膜晶体管的漏极和所述第三薄膜晶体管的源极连接所述第一薄膜晶体管的源极；所述第二薄膜晶体管的栅极和所述第三薄膜晶体管的漏极连接所述复位模块和信号输入模块；所述第二薄膜晶体管的漏极连接第一电源电压；所述第三薄膜晶体管的栅极连接补偿信号。
根据本申请的其中一个方面，所述复位模块包括第四薄膜晶体管，其中，所述第四薄膜晶体管的漏极连接所述补偿模块；所述第四薄膜晶体管的栅极连接复位信号，源极连接复位电压。
根据本申请的其中一个方面，所述信号输入模块包括第五薄膜晶体管、第六薄膜晶体管和驱动电容，其中，所述驱动电容的第一极板连接所述补偿模块和复位模块，第二极板连接所述第五薄膜晶体管和第六薄膜晶体管的源极；所述第五薄膜晶体管和第六薄膜晶体管的栅极连接发光信号；所述第六薄膜晶体管的漏极连接输入数据信号；所述第五薄膜晶体管的漏极连接第一电源电压。
根据本申请的其中一个方面，所述第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管和第五薄膜晶体管为P型薄膜晶体管，所述第六薄膜晶体管为N型薄膜晶体管。
根据本申请的其中一个方面，所述的OLED像素驱动电路处于复位状态时，所述输入数据信号为高电平，所述复位信号为低电平，所述补偿信号为高电平，所述发光信号为高电平；此时，所述信号输入模块和补偿模块关闭，所述发光模块根据所述复位信号进行复位。
根据本申请的其中一个方面，所述的OLED像素驱动电路处于补偿状态时，所述输入数据信号为高电平，所述复位信号为高电平，所述补偿信号为低电平，所述发光信号为高电平；此时，所述信号输入模块和复位模块关闭，所述发光模块根据所述补偿信号对第一薄膜晶体管源极的电压进行补偿。
根据本申请的其中一个方面，所述的OLED像素驱动电路处于发光状态时，所述输入数据信号为低电平，所述复位信号为高电平，所述补偿信号为低电平，所述发光信号为低电平；此时，所述补偿模块和复位模块关闭，所述发光模块根据输入数据信号的指令发光。
另一反面，本申请还提供了一种OLED显示器，其包括OLED像素驱动电路，所述OLED像素驱动电路包括发光模块、补偿模块、复位模块和信号输入模块；其中，所述复位模块用于在复位信号有效时，为所述发光模块提供复位电压；所述补偿模块用于在补偿信号有效时，为所述发光模块提供补偿电压；所述信号输入模块用于为所述发光模块提供输入数据信号；所述发光模块用于根据所述复位信号进行复位，并在复位之后根据所述补偿信号和输入数据信号的指令发光。
根据本申请的其中一个方面，所述发光模块包括有源发光二极管和第一薄膜晶体管，其中，所述有源发光二极管的电流出口端连接第二电源电压，其电流入口端连接所述第一薄膜晶体管的源极；所述第一薄膜晶体管的栅极连接发光信号，漏极连接所述补偿模块。
根据本申请的其中一个方面，所述补偿模块包括第二薄膜晶体管和第三薄膜晶体管，其中，所述第二薄膜晶体管的漏极和所述第三薄膜晶体管的源极连接所述第一薄膜晶体管的源极；所述第二薄膜晶体管的栅极和所述第三薄膜晶体管的漏极连接所述复位模块和信号输入模块；所述第二薄膜晶体管的漏极连接第一电源电压；所述第三薄膜晶体管的栅极连接补偿信号。
根据本申请的其中一个方面，所述复位模块包括第四薄膜晶体管，其中，所述第四薄膜晶体管的漏极连接所述补偿模块；所述第四薄膜晶体管的栅极连接复位信号，源极连接复位电压。
根据本申请的其中一个方面，所述信号输入模块包括第五薄膜晶体管、第六薄膜晶体管和驱动电容，其中，所述驱动电容的第一极板连接所述补偿模块和复位模块，第二极板连接所述第五薄膜晶体管和第六薄膜晶体管的源极；所述第五薄膜晶体管和第六薄膜晶体管的栅极连接发光信号；所述第六薄膜晶体管的漏极连接输入数据信号；所述第五薄膜晶体管的漏极连接第一电源电压。
根据本申请的其中一个方面，所述第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管和第五薄膜晶体管为P型薄膜晶体管，所述第六薄膜晶体管为N型薄膜晶体管。
根据本申请的其中一个方面，所述的OLED像素驱动电路处于复位状态时，所述输入数据信号为高电平，所述复位信号为低电平，所述补偿信号为高电平，所述发光信号为高电平；此时，所述信号输入模块和补偿模块关闭，所述发光模块根据所述复位信号进行复位。
根据本申请的其中一个方面，所述的OLED像素驱动电路处于补偿状态时，所述输入数据信号为高电平，所述复位信号为高电平，所述补偿信号为低电平，所述发光信号为高电平；此时，所述信号输入模块和复位模块关闭，所述发光模块根据所述补偿信号对第一薄膜晶体管源极的电压进行补偿。
根据本申请的其中一个方面，所述的OLED像素驱动电路处于发光状态时，所述输入数据信号为低电平，所述复位信号为高电平，所述补偿信号为低电平，所述发光信号为低电平；此时，所述补偿模块和复位模块关闭，所述发光模块根据输入数据信号的指令发光。
 有益效果
本申请提供的像素驱动电路不仅能够消除阈值电压漂移对OLED显示屏亮度的影响，同时，该电路采用的布局不需要引入额外的数据线，在晶体管数目不变的情况下，本申请具有最小的版图面积，能够将驱动电路的制造成本和工艺复杂度最小化。
 附图说明
图1为本申请的一个具体实施例中的像素驱动电路的电路图；
图2为图1中的像素驱动电路中各个信号的时序图。
 本发明的实施方式
以下各实施例的说明是参考附加的图示，用以例示本申请可用以实施的特定实施例。本申请所提到的方向用语，例如[上]、[下]、[前]、[后]、[左]、[右]、[内]、[外]、[侧面]等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本申请，而非用以限制本申请。在图中，结构相似的单元是用以相同标号表示。
本申请提供一种OLED像素驱动电路和OLED显示器，以消除阈值电压漂移对显示器的显示亮度的影响。下面将结合附图和具体实施例对本申请进行详细说明。
参见图1，本申请提供了一种OLED像素驱动电路，其包括发光模块、补偿模块、复位模块和信号输入模块。
其中，所述复位模块用于在复位信号有效时，为所述发光模块提供复位电压。所述补偿模块用于在补偿信号有效时，为所述发光模块提供补偿电压。所述信号输入模块用于为所述发光模块提供输入数据信号。所述发光模块用于根据所述复位信号进行复位，并在复位之后根据所述补偿信号和输入数据信号的指令发光。
在本实施例中，所述发光模块包括有源发光二极管D1和第一薄膜晶体管T1，其中，所述有源发光二极管D1的电流出口端连接第二电源电压Vss，其电流入口端连接所述第一薄膜晶体管T1的源极；所述第一薄膜晶体管T1的栅极连接发光信号EM，漏极连接所述补偿模块。
所述补偿模块包括第二薄膜晶体管T2和第三薄膜晶体管，其中，所述第二薄膜晶体管T2的漏极和所述第三薄膜晶体管T3的源极连接所述第一薄膜晶体管T1的源极；所述第二薄膜晶体管T2的栅极和所述第三薄膜晶体管T3的漏极连接所述复位模块和信号输入模块；所述第二薄膜晶体管T2的漏极连接第一电源电压Vdd；所述第三薄膜晶体管T3的栅极连接补偿信号Gate。
所述复位模块包括第四薄膜晶体管T4，其中，所述第四薄膜晶体管T4的漏极连接所述补偿模块；所述第四薄膜晶体管T4的栅极连接复位信号Reset，源极连接复位电压int。
所述信号输入模块包括第五薄膜晶体管T5、第六薄膜晶体管T6和驱动电容C，其中，所述驱动电容C的第一极板连接所述补偿模块和复位模块，第二极板连接所述第五薄膜晶体管T5和第六薄膜晶体管T6的源极；所述第五薄膜晶体管T5和第六薄膜晶体管T6的栅极连接发光信号EM；所述第六薄膜晶体管T6的漏极连接输入数据信号Date；所述第五薄膜晶体管T5的漏极连接第一电源电压Vdd。
在本实施例中，所述第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3、第四薄膜晶体管T4和第五薄膜晶体管T5为P型薄膜晶体管，其阈值电压为低电平；所述第六薄膜晶体管T6为N型薄膜晶体管，其阈值电压为高电平。
参见图2，在本实施例中，在时间点t1和t2之间时，所述驱动电路处于复位状态。此时，所述输入数据信号Date为高电平，所述复位信号Reset为低电平，所述补偿信号Gate为高电平，所述发光信号EM为高电平。所述信号输入模块和补偿模块关闭，所述发光模块根据所述复位信号Reset进行复位。
具体的，此时所述第四薄膜晶体管T4和第六薄膜晶体管T6导通，其余的薄膜晶体管断开。即所述驱动电容C的第一极板的电压等于输入数据信号Date，第二极板的电压等于复位电压int（低电平），驱动电容复位完成。
在时间点t2和t3之间时，所述驱动电路处于补偿状态。此时，所述输入数据信号Date为高电平，所述复位信号Reset为高电平，所述补偿信号Gate为低电平，所述发光信号EM为高电平。所述信号输入模块和复位模块关闭，所述发光模块根据所述补偿信号Gate对第一薄膜晶体管T1源极的电压进行补偿。
具体的，此时所述第二薄膜晶体管T2、第三薄膜晶体管T3和第六薄膜晶体管T6导通，其余的薄膜晶体管断开。即所述驱动电容C的第一极板的电压等于输入数据信号Date，第一电源电压Vdd通过第二薄膜晶体管T2给所述驱动电容C充电。当所述第二极板的电压大于第二薄膜晶体管T2的阈值电压后，第二薄膜晶体管T2断开。此时所述驱动电容C的第一极板的电压等于输入数据信号Date，第二极板的电压等于V dd-|V th|，驱动电容C复位完成。
在时间点t3之后，所述驱动电路处于发光状态时，所述输入数据信号Date为低电平，所述复位信号Reset为高电平，所述补偿信号Gate为低电平，所述发光信号EM为低电平。所述补偿模块和复位模块关闭，所述发光模块根据输入数据信号Date的指令发光。
具体的，此时所述第一薄膜晶体管T1和第五薄膜晶体管T5导通，其余的薄膜晶体管断开，第一薄膜晶体管T1的栅极电压等于V dd-|V th|-V Date。此时，所述有源发光二极管D1的电流满足以下条件：
I=1/2μ·C OX·(W/L)·(V dd-V data) 2
其中，μ为载流子迁移率，C OX为栅氧化层电容，W/L驱动晶体管的宽长比，V dd为电源电压，V data为控制数据线的电压。
可以看出，本实施例中的驱动电路中，所述有源发光二极管D1的电流仅与输入数据信号Date相关，有效的消除了薄膜晶体管的阈值电压的漂移对电路发光状态的影响。
相应的，本申请还提供了一种OLED显示器，其包括如前项所述的OLED像素驱动电路。
本申请提供的像素驱动电路不仅能够消除阈值电压漂移对OLED显示屏亮度的影响，同时，该电路采用的布局不需要引入额外的数据线，在晶体管数目不变的情况下，本申请具有最小的版图面积，能够将驱动电路的制造成本和工艺复杂度最小化。
综上所述，虽然本申请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申请，本领域的普通技术人员，在不脱离本申请的精神和范围内，均可作各种更动与润饰，因此本申请的保护范围以权利要求界定的范围为准。

Claims (18)

  1. 一种OLED像素驱动电路，其中，包括发光模块、补偿模块、复位模块和信号输入模块；其中，
    所述复位模块用于在复位信号有效时，为所述发光模块提供复位电压；
    所述补偿模块用于在补偿信号有效时，为所述发光模块提供补偿电压；
    所述信号输入模块用于为所述发光模块提供输入数据信号；
    所述发光模块用于根据所述复位信号进行复位，并在复位之后根据所述补偿信号和输入数据信号的指令发光。
  2. 根据权利要求1所述的OLED像素驱动电路，其中，所述发光模块包括有源发光二极管和第一薄膜晶体管，其中，
    所述有源发光二极管的电流出口端连接第二电源电压，其电流入口端连接所述第一薄膜晶体管的源极；
    所述第一薄膜晶体管的栅极连接发光信号，漏极连接所述补偿模块。
  3. 根据权利要求2所述的OLED像素驱动电路，其中，所述补偿模块包括第二薄膜晶体管和第三薄膜晶体管，其中，
    所述第二薄膜晶体管的漏极和所述第三薄膜晶体管的源极连接所述第一薄膜晶体管的源极；
    所述第二薄膜晶体管的栅极和所述第三薄膜晶体管的漏极连接所述复位模块和信号输入模块；
    所述第二薄膜晶体管的漏极连接第一电源电压；
    所述第三薄膜晶体管的栅极连接补偿信号。
  4. 根据权利要求3所述的OLED像素驱动电路，其中，所述复位模块包括第四薄膜晶体管，其中，
    所述第四薄膜晶体管的漏极连接所述补偿模块；
    所述第四薄膜晶体管的栅极连接复位信号，源极连接复位电压。
  5. 根据权利要求4所述的OLED像素驱动电路，其中，所述信号输入模块包括第五薄膜晶体管、第六薄膜晶体管和驱动电容，其中，
    所述驱动电容的第一极板连接所述补偿模块和复位模块，第二极板连接所述第五薄膜晶体管和第六薄膜晶体管的源极；
    所述第五薄膜晶体管和第六薄膜晶体管的栅极连接发光信号；
    所述第六薄膜晶体管的漏极连接输入数据信号；
    所述第五薄膜晶体管的漏极连接第一电源电压。
  6. 根据权利要求5所述的OLED像素驱动电路，其中，所述第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管和第五薄膜晶体管为P型薄膜晶体管，所述第六薄膜晶体管为N型薄膜晶体管。
  7. 根据权利要求6所述的OLED像素驱动电路，其中，所述的OLED像素驱动电路处于复位状态时，所述输入数据信号为高电平，所述复位信号为低电平，所述补偿信号为高电平，所述发光信号为高电平；此时，
    所述信号输入模块和补偿模块关闭，所述发光模块根据所述复位信号进行复位。
  8. 根据权利要求7所述的OLED像素驱动电路，其中，所述的OLED像素驱动电路处于补偿状态时，所述输入数据信号为高电平，所述复位信号为高电平，所述补偿信号为低电平，所述发光信号为高电平；此时，
    所述信号输入模块和复位模块关闭，所述发光模块根据所述补偿信号对第一薄膜晶体管源极的电压进行补偿。
  9. 根据权利要求7所述的OLED像素驱动电路，其中，所述的OLED像素驱动电路处于发光状态时，所述输入数据信号为低电平，所述复位信号为高电平，所述补偿信号为低电平，所述发光信号为低电平；此时，
    所述补偿模块和复位模块关闭，所述发光模块根据输入数据信号的指令发光。
  10. 一种OLED显示器，其中，包括OLED像素驱动电路，所述OLED像素驱动电路包括发光模块、补偿模块、复位模块和信号输入模块；其中，
    所述复位模块用于在复位信号有效时，为所述发光模块提供复位电压；
    所述补偿模块用于在补偿信号有效时，为所述发光模块提供补偿电压；
    所述信号输入模块用于为所述发光模块提供输入数据信号；
    所述发光模块用于根据所述复位信号进行复位，并在复位之后根据所述补偿信号和输入数据信号的指令发光。
  11. 根据权利要求10所述的OLED显示器，其中，所述发光模块包括有源发光二极管和第一薄膜晶体管，其中，
    所述有源发光二极管的电流出口端连接第二电源电压，其电流入口端连接所述第一薄膜晶体管的源极；
    所述第一薄膜晶体管的栅极连接发光信号，漏极连接所述补偿模块。
  12. 根据权利要求11所述的OLED显示器，其中，所述补偿模块包括第二薄膜晶体管和第三薄膜晶体管，其中，
    所述第二薄膜晶体管的漏极和所述第三薄膜晶体管的源极连接所述第一薄膜晶体管的源极；
    所述第二薄膜晶体管的栅极和所述第三薄膜晶体管的漏极连接所述复位模块和信号输入模块；
    所述第二薄膜晶体管的漏极连接第一电源电压；
    所述第三薄膜晶体管的栅极连接补偿信号。
  13. 根据权利要求12所述的OLED显示器，其中，所述复位模块包括第四薄膜晶体管，其中，
    所述第四薄膜晶体管的漏极连接所述补偿模块；
    所述第四薄膜晶体管的栅极连接复位信号，源极连接复位电压。
  14. 根据权利要求13所述的OLED显示器，其中，所述信号输入模块包括第五薄膜晶体管、第六薄膜晶体管和驱动电容，其中，
    所述驱动电容的第一极板连接所述补偿模块和复位模块，第二极板连接所述第五薄膜晶体管和第六薄膜晶体管的源极；
    所述第五薄膜晶体管和第六薄膜晶体管的栅极连接发光信号；
    所述第六薄膜晶体管的漏极连接输入数据信号；
    所述第五薄膜晶体管的漏极连接第一电源电压。
  15. 根据权利要求14所述的OLED显示器，其中，所述第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管和第五薄膜晶体管为P型薄膜晶体管，所述第六薄膜晶体管为N型薄膜晶体管。
  16. 根据权利要求15所述的OLED显示器，其中，所述的OLED像素驱动电路处于复位状态时，所述输入数据信号为高电平，所述复位信号为低电平，所述补偿信号为高电平，所述发光信号为高电平；此时，
    所述信号输入模块和补偿模块关闭，所述发光模块根据所述复位信号进行复位。
  17. 根据权利要求16所述的OLED显示器，其中，所述的OLED像素驱动电路处于补偿状态时，所述输入数据信号为高电平，所述复位信号为高电平，所述补偿信号为低电平，所述发光信号为高电平；此时，
    所述信号输入模块和复位模块关闭，所述发光模块根据所述补偿信号对第一薄膜晶体管源极的电压进行补偿。
  18. 根据权利要求16所述的OLED显示器，其中，所述的OLED像素驱动电路处于发光状态时，所述输入数据信号为低电平，所述复位信号为高电平，所述补偿信号为低电平，所述发光信号为低电平；此时，
    所述补偿模块和复位模块关闭，所述发光模块根据输入数据信号的指令发光。
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