WO2020186578A1 - 一种 oled 显示面板 - Google Patents

一种 oled 显示面板 Download PDF

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Publication number
WO2020186578A1
WO2020186578A1 PCT/CN2019/082147 CN2019082147W WO2020186578A1 WO 2020186578 A1 WO2020186578 A1 WO 2020186578A1 CN 2019082147 W CN2019082147 W CN 2019082147W WO 2020186578 A1 WO2020186578 A1 WO 2020186578A1
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WIPO (PCT)
Prior art keywords
thin film
film transistor
display panel
oled display
pixel
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Ceased
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PCT/CN2019/082147
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English (en)
French (fr)
Inventor
郑旭煌
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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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Publication of WO2020186578A1 publication Critical patent/WO2020186578A1/zh
Anticipated expiration legal-status Critical
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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • 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

Definitions

  • This application relates to the field of display technology, and in particular to an OLED display panel.
  • the traditional OLED pixel structure uses a single thin film transistor (TFT) to control the current flowing through the OLED, referred to as "drive tube". Because of the instability of the luminescent material and the process, the display effect is not ideal.
  • TFT thin film transistor
  • Commonly used methods are compensation methods, such as optical compensation, internal compensation and external compensation.
  • Optical compensation captures the display screen through the camera, converts it into data, and then feeds it back to the drive system of the display screen for correction after processing by algorithm.
  • a detection circuit is added to the anode of the OLED, and the detected voltage or current value is processed through an algorithm and then compensated.
  • the internal compensation is to add a series of thin film transistors and capacitors, and collect the threshold voltage (Vth) of the driving tube into the capacitor in advance, and then feed it back to the pixel circuit for compensation.
  • Vth threshold voltage
  • optical compensation relies on the camera and complex dedicated systems, it is generally only performed when the panel is produced, and customers cannot make optical compensation by themselves.
  • the external compensation pixel structure is simple, but the detection time of the compensation mode takes a long time. Generally, only a few lines of drive tube display conditions are detected in the free area between frames. The detection time of internal compensation is extremely short, and real-time compensation can be realized, but the large number of thin film transistors affects the aperture ratio and the process is difficult.
  • the present application provides an OLED display panel that can improve the threshold voltage shift phenomenon of thin film transistors used to drive sub-pixels to emit light, so as to solve the phenomenon that the threshold voltage continues to be biased due to long-term positive voltage stress.
  • the present application provides an OLED display panel, including data lines, scan lines, and pixel units distributed in an array.
  • One of the pixel units includes red sub-pixels, green sub-pixels, and blue sub-pixels;
  • the OLED display panel further includes a first power supply and a second power supply, the first power supply is used to provide a first power high level, the second power supply is used to provide a second power low level, each sub-pixel includes A first thin film transistor, a second thin film transistor, and a third thin film transistor;
  • the gate of the first thin film transistor is connected to the scan line, the source of the first thin film transistor is connected to the data line, and the drain of the first thin film transistor is connected in parallel to the gate of the second thin film transistor , The gate of the third thin film transistor;
  • the source of the second thin film transistor is connected to the first power source, and the drain of the second thin film transistor is connected to the second power source;
  • the source of the third thin film transistor is connected to the first power source, and the drain of the third thin film transistor is connected to the second power source;
  • the data line alternately transmits positive voltage data signals and negative voltage data signals, so that the second thin film transistor and the third thin film transistor are alternately in one of the open state and the other in the closed state. To improve the threshold voltage shift.
  • each of the sub-pixels further includes a storage capacitor, the first plate of the storage capacitor is connected to the drain of the first thin film transistor, and the second plate of the storage capacitor Connect to the second power source.
  • the scan signal transmitted by the scan line and the data signal transmitted by the data line are used to jointly make the sub-pixel emit light.
  • the red sub-pixel, the green sub-pixel, and the blue sub-pixel share one scan line.
  • the red sub-pixel, the green sub-pixel, and the blue sub-pixel respectively correspond to one data line.
  • the second thin film transistor is an N-type thin film transistor
  • the third thin film transistor is a P-type thin film transistor
  • M is a positive integer, and when the voltage of the data signal input from the data line is a positive voltage, the second thin film transistor is turned on, and the third thin film transistor shut down;
  • the second thin film transistor when the voltage of the data signal input from the data line is a negative voltage, the second thin film transistor is turned off and the third thin film transistor is turned on.
  • the voltage of the scan signal input by the scan line is a positive voltage
  • the threshold voltage of the second thin film transistor is a positive value
  • the voltage of the scan signal input by the scan line is a positive voltage
  • the threshold voltage of the third thin film transistor is a negative value
  • the threshold voltage of the second thin film transistor is complementary to the threshold voltage of the third thin film transistor.
  • the present application also provides an OLED display panel, including data lines, scan lines, and pixel units distributed in an array, one of the pixel units includes red sub-pixels, green sub-pixels, and blue sub-pixels;
  • the OLED display panel further includes a first power source and a second power source, and each sub-pixel includes a first thin film transistor, a second thin film transistor, and a third thin film transistor;
  • the gate of the first thin film transistor is connected to the scan line, the source of the first thin film transistor is connected to the data line, and the drain of the first thin film transistor is connected in parallel to the gate of the second thin film transistor , The gate of the third thin film transistor;
  • the source of the second thin film transistor is connected to the first power source, and the drain of the second thin film transistor is connected to the second power source;
  • the source of the third thin film transistor is connected to the first power source, and the drain of the third thin film transistor is connected to the second power source;
  • the data line alternately transmits positive voltage data signals and negative voltage data signals, so that the second thin film transistor and the third thin film transistor are alternately in one of the open state and the other in the closed state. To improve the threshold voltage shift.
  • each of the sub-pixels further includes a storage capacitor, the first plate of the storage capacitor is connected to the drain of the first thin film transistor, and the second plate of the storage capacitor Connect to the second power source.
  • the scan signal transmitted by the scan line and the data signal transmitted by the data line are used to jointly make the sub-pixel emit light.
  • the red sub-pixel, the green sub-pixel, and the blue sub-pixel share one scan line.
  • the red sub-pixel, the green sub-pixel, and the blue sub-pixel respectively correspond to one data line.
  • the second thin film transistor is an N-type thin film transistor
  • the third thin film transistor is a P-type thin film transistor
  • M is a positive integer, and when the voltage of the data signal input from the data line is a positive voltage, the second thin film transistor is turned on, and the third thin film transistor shut down;
  • the second thin film transistor when the voltage of the data signal input from the data line is a negative voltage, the second thin film transistor is turned off and the third thin film transistor is turned on.
  • the voltage of the scan signal input by the scan line is a positive voltage
  • the threshold voltage of the second thin film transistor is a positive value
  • the voltage of the scan signal input by the scan line is a positive voltage
  • the threshold voltage of the third thin film transistor is a negative value
  • the threshold voltage of the second thin film transistor is complementary to the threshold voltage of the third thin film transistor.
  • the beneficial effect of the present application is that compared with the existing OLED display panel, the OLED display panel provided by the present application provides two thin film transistors for driving sub-pixels to emit light by providing two thin film transistors in the pixel circuit, specifically N-type thin film transistors and The P-type thin film transistors are matched in parallel, thereby realizing the alternate cooperative work of the two thin film transistors to stabilize the threshold voltage deviation and improve the display effect.
  • This application does not need to consume a long detection time like external compensation. For a single sub-pixel, the number of thin film transistors can also be effectively controlled.
  • the overall structure is simple and practical, which can greatly improve the display of the OLED display panel. effect.
  • FIG. 1 is a pixel circuit diagram of an OLED display panel provided by an embodiment of the application.
  • FIG. 2 is a waveform diagram of a pixel circuit in M frames provided by an embodiment of the application
  • FIG. 3 is a waveform diagram of the pixel circuit in the M+1 frame provided by an embodiment of the application.
  • the present application is directed to the technical problem of the existing OLED display panel that has the threshold voltage shift phenomenon of the thin film transistors used to drive the sub-pixels to emit light, thereby affecting the display effect of the display panel.
  • This embodiment can solve this defect.
  • FIG. 1 it is a pixel circuit diagram of an OLED display panel provided by an embodiment of this application.
  • the OLED display panel includes a base substrate, a plurality of data lines and a plurality of scan lines prepared on the base substrate, and pixel units distributed in an array.
  • a pixel unit includes a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B.
  • the OLED display panel further includes a first power source and a second power source. The first power source is used to provide a first power source high level VDD, and the second power source is used to provide a second power source low level VSS.
  • Each sub-pixel includes an anode, a cathode, a first thin film transistor, a second thin film transistor, a third thin film transistor, and a storage capacitor.
  • the red sub-pixel R is taken as an example to describe the pixel circuit structure of a single sub-pixel.
  • the red sub-pixel R includes a first thin film transistor T11, a second thin film transistor T12, a third thin film transistor T13, and a storage capacitor Cst1.
  • the gate of the first thin film transistor T11 is connected to the scan line Scan-R, the source of the first thin film transistor T11 is connected to the data line Date-R, and the drain of the first thin film transistor T11 is connected in parallel to the second The gate of the thin film transistor T12, the gate of the third thin film transistor T13, and the first plate of the storage capacitor Cst1.
  • the source of the second thin film transistor T12 is connected to the first power supply high level VDD, and the drain of the second thin film transistor T12 is connected to the anode, and is connected to the second power supply low through the cathode.
  • Level VSS The source of the third thin film transistor T13 is connected to the first power supply high level VDD, and the drain of the third thin film transistor T13 is connected to the anode, and is connected to the second power supply low through the cathode.
  • Level VSS The second plate of the storage capacitor Cst1 is connected to the anode, and is connected to the second power supply low level VSS through the cathode.
  • the pixel circuit architecture of the green sub-pixel G and the blue sub-pixel B is the same as the pixel circuit architecture of the red sub-pixel R, which will not be repeated here.
  • the first thin film transistor T11 is used as a switch tube for controlling the writing of data signals; the second thin film transistor T12 and the first thin film transistor T12
  • the three thin film transistors T13 are used as a driving tube for driving the red sub-pixel R to emit light by controlling the magnitude of the current.
  • the data line Date-R is used to alternately transmit a positive voltage data signal and a negative voltage data signal, so that the second thin film transistor T12 and the third thin film transistor T13 are alternately in one of the open states and the other Is closed.
  • the green sub-pixel G and the blue sub-pixel B have the same design, which will not be repeated here.
  • the scan signal transmitted by the scan line and the data signal transmitted by the data line are used to jointly make the sub-pixel emit light.
  • the driving tube has a characteristic, that is, when Vgs (the voltage difference between the gate and the source) is positive, Vth (the threshold voltage of the driving tube) will be positive; and when Vgs is negative, Vth will be negative. . Since the writing of the data signal in the present application adopts a positive voltage mode and a negative voltage mode alternately, the threshold voltage deviation of the driving tube will be improved, thereby improving the light-emitting stability of the OLED display panel and enhancing the display effect of the screen.
  • the waveforms of the scanning signal voltages input by the first thin film transistor for controlling data signal writing are consistent, so the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B share the same
  • One scan line can greatly reduce the number of wiring lines of the display panel and increase the aperture ratio; of course, it is not limited to this, and the scan lines can also be set independently for different sub-pixels.
  • the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B respectively correspond to one data line.
  • the second thin film transistor is an N-type thin film transistor
  • the third thin film transistor is a P-type thin film transistor, or the opposite.
  • the voltage of the input valid data signal is a positive voltage
  • the N-type thin film transistor is turned on and the P-type thin film transistor is turned off
  • the voltage of the input valid data signal is a negative voltage
  • the P-type thin film transistor is turned on and the N-type thin film transistor is turned on. shut down.
  • the voltage of the scan signal input from the scan line Scan-R/G/B is a positive voltage
  • the voltage of the data signal input from the data line Date-R/G/B is The voltage is a positive voltage
  • the second thin film transistor is turned on
  • the third thin film transistor is turned off, that is, the threshold voltage of the second thin film transistor is a positive value.
  • the voltage of the scan signal input from the scan line Scan-R/G/B is a positive voltage
  • the voltage of the data signal input from the data line Date-R/G/B is a negative voltage
  • the second thin film transistor is turned off, and the third thin film transistor is turned on, that is, the threshold voltage of the third thin film transistor is a negative value. Therefore, the threshold voltage of the second thin film transistor is complementary to the threshold voltage of the third thin film transistor, so as to stabilize the threshold voltage deviation and improve the display effect.
  • two thin film transistors for driving the sub-pixels to emit light are provided in the pixel circuit, specifically, the N-type thin film transistor and the P-type thin film transistor are matched in parallel, thereby achieving two
  • the alternating and coordinated work of the two thin film transistors can stabilize the threshold voltage deviation and improve the display effect.
  • This application does not need to consume a long detection time like external compensation.
  • the number of thin film transistors can also be effectively controlled.
  • the overall structure is simple and practical, which can greatly improve the display of the OLED display panel. effect.

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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

本申请提供一种OLED显示面板，包括数据线、扫描线及像素单元，像素单元包括红色子像素、绿色子像素、蓝色子像素。每个子像素均包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管；其中，数据线交替传输正电压数据信号和负电压数据信号，使得第二薄膜晶体管和第三薄膜晶体管交替的处于一者为打开状态，另一者为关闭状态。

Description

一种OLED显示面板 技术领域
本申请涉及显示技术领域，尤其涉及一种OLED显示面板。
 背景技术
传统OLED像素结构，采用单个薄膜晶体管（TFT）来控制流经OLED的电流，简称“驱动管”。因为发光材料与工艺制程的不稳定性会导致显示效果不够理想。常用的做法为补偿法，如光学补偿、内部补偿和外部补偿。光学补偿通过摄像头对显示画面进行捕捉，转化为数据，通过算法处理后再反馈到显示屏的驱动系统中进行校正。外部补偿在OLED阳极增设一路侦测电路，通过算法对侦测到的电压值或电流值进行处理然后进行补偿。内部补偿为增设一系列的薄膜晶体管以及电容，将驱动管的阈值电压（Vth）提前采集到电容中，再反馈到像素电路中进行补偿。
由于光学补偿依赖于摄像头与复杂专用的系统，一般都只在面板产出时进行，客户无法自行光学补偿。外部补偿像素结构简单，但补偿模式的侦测时间耗时较长，一般只在帧与帧之间的空闲区侦测几行的驱动管显示状况。内部补偿的侦测时间极短，能够实现实时补偿，但薄膜晶体管的数量较多，影响开口率且工艺难度较大。
因此，现有技术存在缺陷，急需改进。
 技术问题
本申请提供一种OLED显示面板，能够改善用于驱动子像素发光的薄膜晶体管的阈值电压偏移现象，以解决其长期处于正电压应力下而出现阈值电压持续正偏的现象。
 技术解决方案
为解决上述问题，本申请提供的技术方案如下：
本申请提供一种OLED显示面板，包括数据线、扫描线以及阵列分布的像素单元，一所述像素单元包括红色子像素、绿色子像素、蓝色子像素；
所述OLED显示面板还包括第一电源和第二电源，所述第一电源用于提供第一电源高电平，所述第二电源用于提供第二电源低电平，每个子像素均包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管；
所述第一薄膜晶体管的栅极连接所述扫描线，所述第一薄膜晶体管的源极连接所述数据线，所述第一薄膜晶体管的漏极并联连接所述第二薄膜晶体管的栅极、所述第三薄膜晶体管的栅极；
所述第二薄膜晶体管的源极接入所述第一电源，所述第二薄膜晶体管的漏极接入所述第二电源；
所述第三薄膜晶体管的源极接入所述第一电源，所述第三薄膜晶体管的漏极接入所述第二电源；
其中，所述数据线交替的传输正电压数据信号和负电压数据信号，使得所述第二薄膜晶体管和所述第三薄膜晶体管交替的处于一者为打开状态，另一者为关闭状态，用以改善阈值电压偏移。
在本申请的OLED显示面板中，每个所述子像素还包括存储电容，所述存储电容的第一极板与所述第一薄膜晶体管的漏极连接，所述存储电容的第二极板接入所述第二电源。
在本申请的OLED显示面板中，所述扫描线所传输的扫描信号和所述数据线所传输的所述数据信号用于共同使得所述子像素发光。
在本申请的OLED显示面板中，所述红色子像素、所述绿色子像素、所述蓝色子像素共用一条所述扫描线。
在本申请的OLED显示面板中，所述红色子像素、所述绿色子像素、所述蓝色子像素分别对应一条所述数据线。
在本申请的OLED显示面板中，所述第二薄膜晶体管为N型薄膜晶体管，所述第三薄膜晶体管为P型薄膜晶体管。
在本申请的OLED显示面板中，第M帧时，M为正整数，所述数据线输入的所述数据信号的电压为正电压时，所述第二薄膜晶体管打开，所述第三薄膜晶体管关闭；
第M+1帧时，所述数据线输入的所述数据信号的电压为负电压时，所述第二薄膜晶体管关闭，所述第三薄膜晶体管打开。
在本申请的OLED显示面板中，第M帧时，所述扫描线输入的扫描信号的电压为正电压，所述第二薄膜晶体管的阈值电压为正值。
在本申请的OLED显示面板中，第M+1帧时，所述扫描线输入的扫描信号的电压为正电压，所述第三薄膜晶体管的阈值电压为负值。
在本申请的OLED显示面板中，所述第二薄膜晶体管的阈值电压与所述第三薄膜晶体管的阈值电压形成互补。
为解决上述问题，本申请还提供一种OLED显示面板，包括数据线、扫描线以及阵列分布的像素单元，一所述像素单元包括红色子像素、绿色子像素、蓝色子像素；
所述OLED显示面板还包括第一电源和第二电源，每个子像素均包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管；
所述第一薄膜晶体管的栅极连接所述扫描线，所述第一薄膜晶体管的源极连接所述数据线，所述第一薄膜晶体管的漏极并联连接所述第二薄膜晶体管的栅极、所述第三薄膜晶体管的栅极；
所述第二薄膜晶体管的源极接入所述第一电源，所述第二薄膜晶体管的漏极接入所述第二电源；
所述第三薄膜晶体管的源极接入所述第一电源，所述第三薄膜晶体管的漏极接入所述第二电源；
其中，所述数据线交替的传输正电压数据信号和负电压数据信号，使得所述第二薄膜晶体管和所述第三薄膜晶体管交替的处于一者为打开状态，另一者为关闭状态，用以改善阈值电压偏移。
在本申请的OLED显示面板中，每个所述子像素还包括存储电容，所述存储电容的第一极板与所述第一薄膜晶体管的漏极连接，所述存储电容的第二极板接入所述第二电源。
在本申请的OLED显示面板中，所述扫描线所传输的扫描信号和所述数据线所传输的所述数据信号用于共同使得所述子像素发光。
在本申请的OLED显示面板中，所述红色子像素、所述绿色子像素、所述蓝色子像素共用一条所述扫描线。
在本申请的OLED显示面板中，所述红色子像素、所述绿色子像素、所述蓝色子像素分别对应一条所述数据线。
在本申请的OLED显示面板中，所述第二薄膜晶体管为N型薄膜晶体管，所述第三薄膜晶体管为P型薄膜晶体管。
在本申请的OLED显示面板中，第M帧时，M为正整数，所述数据线输入的所述数据信号的电压为正电压时，所述第二薄膜晶体管打开，所述第三薄膜晶体管关闭；
第M+1帧时，所述数据线输入的所述数据信号的电压为负电压时，所述第二薄膜晶体管关闭，所述第三薄膜晶体管打开。
在本申请的OLED显示面板中，第M帧时，所述扫描线输入的扫描信号的电压为正电压，所述第二薄膜晶体管的阈值电压为正值。
在本申请的OLED显示面板中，第M+1帧时，所述扫描线输入的扫描信号的电压为正电压，所述第三薄膜晶体管的阈值电压为负值。
在本申请的OLED显示面板中，所述第二薄膜晶体管的阈值电压与所述第三薄膜晶体管的阈值电压形成互补。
 有益效果
本申请的有益效果为：相较于现有的OLED显示面板，本申请提供的OLED显示面板，通过在像素电路中设置两个用以驱动子像素发光的薄膜晶体管，具体为N型薄膜晶体管与P型薄膜晶体管进行并联搭配，由此实现两个薄膜晶体管的交替协同工作，以稳定阈值电压偏移状况，提升显示效果。本申请既不需要像外部补偿那样耗费很长的侦测时间，对于单个子像素，薄膜晶体管的数量也能得到有效的控制，整体结构简单而实用，能够很大程度上改善OLED显示面板的显示效果。
 附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是申请的一些实施例，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为本申请实施例提供的OLED显示面板的像素电路图；
图2为本申请实施例提供的M帧时像素电路的波形图；
图3为本申请实施例提供的M+1帧时像素电路的波形图。
 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。
本申请针对现有的OLED显示面板，存在用于驱动子像素发光的薄膜晶体管的阈值电压偏移现象，从而影响显示面板显示效果的技术问题，本实施例能够解决该缺陷。
如图1所示，为本申请实施例提供的OLED显示面板的像素电路图。所述OLED显示面板包括：衬底基板，以及制备于所述衬底基板上的多条数据线与多条扫描线，以及阵列分布的像素单元。一所述像素单元包括红色子像素R、绿色子像素G、蓝色子像素B。所述OLED显示面板还包括第一电源和第二电源，所述第一电源用于提供第一电源高电平VDD，所述第二电源用于提供第二电源低电平VSS。每个子像素均包括阳极、阴极、第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管以及存储电容。其中，以所述红色子像素R为例对单个所述子像素的像素电路构架进行说明。
所述红色子像素R包括第一薄膜晶体管T11、第二薄膜晶体管T12、第三薄膜晶体管T13以及存储电容Cst1。所述第一薄膜晶体管T11的栅极连接扫描线Scan-R，所述第一薄膜晶体管T11的源极连接数据线Date-R，所述第一薄膜晶体管T11的漏极并联连接所述第二薄膜晶体管T12的栅极、所述第三薄膜晶体管T13的栅极以及所述存储电容Cst1的第一极板。所述第二薄膜晶体管T12的源极接入所述第一电源高电平VDD，所述第二薄膜晶体管T12的漏极连接所述阳极，并通过所述阴极接入所述第二电源低电平VSS。所述第三薄膜晶体管T13的源极接入所述第一电源高电平VDD，所述第三薄膜晶体管T13的漏极连接所述阳极，并通过所述阴极接入所述第二电源低电平VSS。所述存储电容Cst1的第二极板连接所述阳极，并通过所述阴极接入所述第二电源低电平VSS。
所述绿色子像素G、所述蓝色子像素B的像素电路构架与所述红色子像素R的像素电路构架一致，此处不再赘述。
对于单个所述子像素，仍以所述红色子像素R为例，所述第一薄膜晶体管T11用作开关管，用于控制数据信号的写入；所述第二薄膜晶体管T12和所述第三薄膜晶体管T13用作驱动管，用于通过控制电流的大小以驱动所述红色子像素R发光。所述数据线Date-R用于交替的传输正电压数据信号和负电压数据信号，使得所述第二薄膜晶体管T12和所述第三薄膜晶体管T13交替的处于一者为打开状态，另一者为关闭状态。所述绿色子像素G与所述蓝色子像素B也是同样的设计，此处不再赘述。
其中，所述扫描线所传输的扫描信号和所述数据线所传输的所述数据信号用于共同使得所述子像素发光。
由于所述驱动管会有一种特性，即Vgs（栅极和源极的电压差）为正值时，Vth（驱动管的阈值电压）会正偏；而Vgs为负值时，Vth会负偏。由于本申请的数据信号的写入采用正电压模式和负电压模式交替的形式，会改善所述驱动管的阈值电压偏移，从而改善OLED显示面板的发光稳定性，提升屏幕的显示效果。
对于所述子像素，控制数据信号写入的所述第一薄膜晶体管输入的扫描信号电压的波形一致，因此所述红色子像素R、所述绿色子像素G、所述蓝色子像素B共用一条所述扫描线，如此可大幅缩减显示面板走线的数量，提升开口率；当然并不限于此，不同所述子像素也可以独立设置所述扫描线。
所述红色子像素R、所述绿色子像素G、所述蓝色子像素B分别对应一条所述数据线。
对于所述子像素，其中所述第二薄膜晶体管为N型薄膜晶体管，所述第三薄膜晶体管为P型薄膜晶体管，或者两者相反。当输入的有效的数据信号的电压为正电压时，N型薄膜晶体管打开，P型薄膜晶体管关闭；当输入的有效的数据信号的电压为负电压时，P型薄膜晶体管打开，N型薄膜晶体管关闭。
具体请参照图2和图3所示，以第N行（N为正整数）扫描线为例进行说明。第M帧时（M为正整数），所述扫描线Scan-R/G/B输入的扫描信号的电压为正电压，所述数据线Date-R/G/B输入的所述数据信号的电压为正电压，所述第二薄膜晶体管打开，所述第三薄膜晶体管关闭，即所述第二薄膜晶体管的阈值电压为正值。第M+1帧时，所述扫描线Scan-R/G/B输入的扫描信号的电压为正电压，所述数据线Date-R/G/B输入的所述数据信号的电压为负电压，所述第二薄膜晶体管关闭，所述第三薄膜晶体管打开，即所述第三薄膜晶体管的阈值电压为负值。因此，所述第二薄膜晶体管的阈值电压与所述第三薄膜晶体管的阈值电压形成互补，以稳定阈值电压偏移状况，提升显示效果。
考虑到面板产出时每个所述驱动管的特性会有差异，因此前期面板产出时，应进行光学补偿，对输出相应灰阶的数据信号电压进行演算，最终生成查找表（Look-up-table），导入面板的显示系统中。后续该数据将作为数据信号电压最直接的参考。在后续的显示阶段，输入特定的波形，进行画面显示。
综上所述，本申请提供的OLED显示面板，通过在像素电路中设置两个用以驱动子像素发光的薄膜晶体管，具体为N型薄膜晶体管与P型薄膜晶体管进行并联搭配，由此实现两个薄膜晶体管的交替协同工作，以稳定阈值电压偏移状况，提升显示效果。本申请既不需要像外部补偿那样耗费很长的侦测时间，对于单个子像素，薄膜晶体管的数量也能得到有效的控制，整体结构简单而实用，能够很大程度上改善OLED显示面板的显示效果。
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 (20)

  1. 一种OLED显示面板，其包括数据线、扫描线以及阵列分布的像素单元，一所述像素单元包括红色子像素、绿色子像素、蓝色子像素；
    所述OLED显示面板还包括第一电源和第二电源，所述第一电源用于提供第一电源高电平，所述第二电源用于提供第二电源低电平，每个子像素均包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管；
    所述第一薄膜晶体管的栅极连接所述扫描线，所述第一薄膜晶体管的源极连接所述数据线，所述第一薄膜晶体管的漏极并联连接所述第二薄膜晶体管的栅极、所述第三薄膜晶体管的栅极；
    所述第二薄膜晶体管的源极接入所述第一电源，所述第二薄膜晶体管的漏极接入所述第二电源；
    所述第三薄膜晶体管的源极接入所述第一电源，所述第三薄膜晶体管的漏极接入所述第二电源；
    其中，所述数据线交替的传输正电压数据信号和负电压数据信号，使得所述第二薄膜晶体管和所述第三薄膜晶体管交替的处于一者为打开状态，另一者为关闭状态，用以改善阈值电压偏移。
  2. 根据权利要求1所述的OLED显示面板，其中，每个所述子像素还包括存储电容，所述存储电容的第一极板与所述第一薄膜晶体管的漏极连接，所述存储电容的第二极板接入所述第二电源。
  3. 根据权利要求1所述的OLED显示面板，其中，所述扫描线所传输的扫描信号和所述数据线所传输的所述数据信号用于共同使得所述子像素发光。
  4. 根据权利要求1所述的OLED显示面板，其中，所述红色子像素、所述绿色子像素、所述蓝色子像素共用一条所述扫描线。
  5. 根据权利要求1所述的OLED显示面板，其中，所述红色子像素、所述绿色子像素、所述蓝色子像素分别对应一条所述数据线。
  6. 根据权利要求1所述的OLED显示面板，其中，所述第二薄膜晶体管为N型薄膜晶体管，所述第三薄膜晶体管为P型薄膜晶体管。
  7. 根据权利要求6所述的OLED显示面板，其中，第M帧时，M为正整数，所述数据线输入的所述数据信号的电压为正电压时，所述第二薄膜晶体管打开，所述第三薄膜晶体管关闭；
    第M+1帧时，所述数据线输入的所述数据信号的电压为负电压时，所述第二薄膜晶体管关闭，所述第三薄膜晶体管打开。
  8. 根据权利要求7所述的OLED显示面板，其中，第M帧时，所述扫描线输入的扫描信号的电压为正电压，所述第二薄膜晶体管的阈值电压为正值。
  9. 根据权利要求7所述的OLED显示面板，其中，第M+1帧时，所述扫描线输入的扫描信号的电压为正电压，所述第三薄膜晶体管的阈值电压为负值。
  10. 根据权利要求8所述的OLED显示面板，其中，所述第二薄膜晶体管的阈值电压与所述第三薄膜晶体管的阈值电压形成互补。
  11. 一种OLED显示面板，其包括数据线、扫描线以及阵列分布的像素单元，一所述像素单元包括红色子像素、绿色子像素、蓝色子像素；
    所述OLED显示面板还包括第一电源和第二电源，每个子像素均包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管；
    所述第一薄膜晶体管的栅极连接所述扫描线，所述第一薄膜晶体管的源极连接所述数据线，所述第一薄膜晶体管的漏极并联连接所述第二薄膜晶体管的栅极、所述第三薄膜晶体管的栅极；
    所述第二薄膜晶体管的源极接入所述第一电源，所述第二薄膜晶体管的漏极接入所述第二电源；
    所述第三薄膜晶体管的源极接入所述第一电源，所述第三薄膜晶体管的漏极接入所述第二电源；
    其中，所述数据线交替的传输正电压数据信号和负电压数据信号，使得所述第二薄膜晶体管和所述第三薄膜晶体管交替的处于一者为打开状态，另一者为关闭状态，用以改善阈值电压偏移。
  12. 根据权利要求11所述的OLED显示面板，其中，每个所述子像素还包括存储电容，所述存储电容的第一极板与所述第一薄膜晶体管的漏极连接，所述存储电容的第二极板接入所述第二电源。
  13. 根据权利要求11所述的OLED显示面板，其中，所述扫描线所传输的扫描信号和所述数据线所传输的所述数据信号用于共同使得所述子像素发光。
  14. 根据权利要求11所述的OLED显示面板，其中，所述红色子像素、所述绿色子像素、所述蓝色子像素共用一条所述扫描线。
  15. 根据权利要求11所述的OLED显示面板，其中，所述红色子像素、所述绿色子像素、所述蓝色子像素分别对应一条所述数据线。
  16. 根据权利要求11所述的OLED显示面板，其中，所述第二薄膜晶体管为N型薄膜晶体管，所述第三薄膜晶体管为P型薄膜晶体管。
  17. 根据权利要求16所述的OLED显示面板，其中，第M帧时，M为正整数，所述数据线输入的所述数据信号的电压为正电压时，所述第二薄膜晶体管打开，所述第三薄膜晶体管关闭；
    第M+1帧时，所述数据线输入的所述数据信号的电压为负电压时，所述第二薄膜晶体管关闭，所述第三薄膜晶体管打开。
  18. 根据权利要求17所述的OLED显示面板，其中，第M帧时，所述扫描线输入的扫描信号的电压为正电压，所述第二薄膜晶体管的阈值电压为正值。
  19. 根据权利要求17所述的OLED显示面板，其中，第M+1帧时，所述扫描线输入的扫描信号的电压为正电压，所述第三薄膜晶体管的阈值电压为负值。
  20. 根据权利要求18所述的OLED显示面板，其中，所述第二薄膜晶体管的阈值电压与所述第三薄膜晶体管的阈值电压形成互补。
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