CN103383835A - 一种像素电路、显示面板及显示装置 - Google Patents

一种像素电路、显示面板及显示装置 Download PDF

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CN103383835A
CN103383835A CN2013102748934A CN201310274893A CN103383835A CN 103383835 A CN103383835 A CN 103383835A CN 2013102748934 A CN2013102748934 A CN 2013102748934A CN 201310274893 A CN201310274893 A CN 201310274893A CN 103383835 A CN103383835 A CN 103383835A
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voltage source
image element
luminescent device
electronic circuit
reference voltage
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CN103383835B (zh
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孙亮
任章淳
皇甫鲁江
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BOE Technology Group Co Ltd
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Priority to US14/382,506 priority patent/US9251737B2/en
Priority to PCT/CN2013/088673 priority patent/WO2015000261A1/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]
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    • 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
    • G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
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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
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    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
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    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
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    • G—PHYSICS
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  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)

Abstract

本发明公开了一种像素电路、显示面板及显示装置，用以提高显示面板显示区域显示亮度的均匀性。所述像素电路包括：充电子电路、驱动子电路和补偿子电路；所述驱动子电路的第一端通过电源引线与第一参考电压源相连，第二端与发光器件的第一端相连，发光器件的第二端与补偿子电路的第一端相连，补偿子电路的第二端与第二参考电压源相连；驱动子电路的第三端与充电子电路相连；所述充电子电路用于在所述驱动子电路驱动所述发光器件发光之前为驱动子电路充电，所述补偿子电路用于补偿所述第一参考电压源提供给所述驱动子电路的电压在所述电源引线上的电压降。

Description

一种像素电路、显示面板及显示装置
技术领域
本发明涉及有机发光显示技术领域，尤其涉及一种像素电路、显示面板及显示装置。
背景技术
有机发光二极管(Organic Light Emitting Diode，OLED)显示器因具有功耗低、亮度高、成本低、视角广，以及响应速度快等优点，备受关注，在有机发光技术领域得到了广泛的应用。
OLED显示器驱动发光器件发光显示的驱动方式为直流驱动，在驱动发光器件发光显示之前，为电容充电，将数据信号写入电容；在驱动发光器件发光显示时，电容放电，电容放电电压决定流经驱动晶体管的驱动电流，驱动晶体管的驱动电流驱动发光器件发光。
一般地，无任何补偿子电路的像素电路，驱动发光器件发光的驱动电流id与(Vdd-Vss-VData-Vth)2成正比。其中，Vdd为高电平参考电压，Vss为低电平参考电压，VData为数据线提供的数据信号电压，Vth为驱动晶体管的阈值电压。
现有OLED显示器像素结构存在以下问题。
首先，背板上用于驱动各发光器件发光显示的多个驱动晶体管由于在制作过程中存在结构上的不均匀性，以及电学性能和稳定性方面的不均匀性，导致各驱动晶体管的阈值电压Vth相比较预设值Vth0发生了漂移。其次，驱动晶体管在长时间直流驱动导通的情况下会造成稳定性下降，其阈值电压Vth值也会发生改变。
另外，随着OLED尺寸大型化的发展，相应地信号线上的负载变大，像素电路的数量增多，同一供电电源(提供高电平参考电压Vdd的供电电源)为不同的像素电路供电，因电压Vdd随走线的增加而下降的比较明显，使得实际提供给每一个像素电路的电压Vdd有差异。当为每一个像素电路施加相同的数据信号VData时，因Vdd的值不同，背板显示区域流过每个OLED的电流之间不相等，导致背板上的电流不均匀，从而导致图像亮度不均匀。
发明内容
本发明实施例提供的一种像素电路、显示面板及显示装置，用以提高显示面板显示区域显示亮度的均匀性。
本发明实施例提供的一种像素电路包括：充电子电路、驱动子电路和补偿子电路；
所述驱动子电路的第一端通过电源引线与第一参考电压源相连，第二端与发光器件的第一端相连，发光器件的第二端与补偿子电路的第一端相连，补偿子电路的第二端与第二参考电压源相连；驱动子电路的第三端与充电子电路相连；
所述充电子电路用于在所述驱动子电路驱动所述发光器件发光之前为驱动子电路充电，所述补偿子电路用于在所述驱动子电路驱动所述发光器件发光时补偿所述第一参考电压源提供给所述驱动子电路的电压在所述电源引线上的电压降。
较佳地，所述补偿子电路为直流电压源，该直流电压源的正极端与所述第二参考电压源相连，负极端与所述发光器件的第二端相连，该直流电压源提供的电压低于所述第二参考电压源提供的电压。
较佳地，所述直流电压源为可调直流电压源。
较佳地，所述驱动子电路包括驱动晶体管和电容；所述充电子电路包括开关晶体管、数据信号源和门信号源；
其中，所述驱动晶体管的源极通过所述电源引线与第一参考电压源相连，漏极与发光器件的第一端相连，栅极与所述电容的第一端以及所述开关晶体管的漏极相连；所述电容的第二端与所述第一参考电压源相连；所述开关晶体管的栅极与所述门信号源相连，源极与数据信号源相连。
较佳地，所述驱动晶体管为n型驱动晶体管或p型驱动晶体管；
当所述驱动晶体管为n型驱动晶体管时，所述第一参考电压源为低电平电压源，所述第二参考电压源为高电平电压源，所述发光器件的阴极与所述驱动晶体管相连，阳极与所述直流电压源的负极端相连；
当所述驱动晶体管为p型驱动晶体管时，所述第一参考电压源为高电平电压源，所述第二参考电压源为低电平电压源，所述发光器件的阳极与所述驱动晶体管相连，阴极与所述直流电压源的负极端相连。
本发明实施例提供一种显示面板，包括呈矩阵排列的多个像素单元，每一像素单元中包括一个像素电路和与该像素电路相连的发光器件，该像素电路用于驱动所述发光器件发光；
其中，与所述多个像素单元一一对应的像素电路至少之一为上述具有补偿子电路的像素电路。
较佳地，与位于同一行的像素单元一一对应的像素电路为上述具有补偿子电路的像素电路。
较佳地，与位于同一行的像素单元一一对应的像素电路中的所述补偿子电路为同一补偿子电路。
较佳地，所述补偿子电路通过引线与发光器件相连，所述引线与显示面板中的栅极、栅线、数据线、源漏极、发光器件的阴极或阳极的其中任一同层设置。
本发明实施例提供一种显示装置，包括所述显示面板。
本发明实施例提供的像素电路，通过在发光器件和第二参考电压源之间设置补偿子电路，该补偿子电路用于补偿第一参考电压源提供的电压在电源引线上的衰减量ΔV，使得驱动发光器件发光的驱动电流与衰减量ΔV无关。
附图说明
图1为本发明实施例提供的像素电路结构示意图之一；
图2为本发明实施例提供的像素电路结构示意图之二；
图3为本发明实施例提供的像素电路结构示意图之三；
图4为本发明实施例提供的显示面板结构示意图。
具体实施方式
本发明实施例提供的一种像素电路、显示面板及显示装置，用以提高显示面板显示区域显示亮度的均匀性。
有源矩阵有机发光显示(AMOLED)面板中，包括多个呈矩阵分布的像素单元，每一像素单元中包括发光器件(如OLED)和驱动该发光器件发光显示的像素电路。
像素电路中包括提供工作电压的第一参考电压源和第二参考电压源。一般地，显示面板上的多个像素电路或全部像素电路共用一个第一参考电压源和一个第二参考电压源。各像素电路的一端与第一参考电压源相连，另一端与相应的发光器件的一端相连，发光器件的另一端与第二参考电压源相连；第一参考电压源通过显示面板上沿同一方向分布的多条电源引线与多个像素电路相连；由于像素电路的驱动方式为电流驱动方式，第一参考电压源提供的电压加载到像素电路时，电压在具有一定电阻值的电源引线上具有一定衰减，使得第一参考电压源实际提供给像素电路的电压值小于预设电压值，第一参考电压源提供的电压在电源引线上的衰减量定义为ΔV，驱动发光器件发光的驱动电流与衰减量ΔV有关，衰减量的存在导致像素电路驱动发光器件发光异常或发光亮度较低。
本发明实施例提供的像素电路，通过在发光器件和第二参考电压源之间设置补偿子电路，该补偿子电路用于补偿第一参考电压源提供的电压在电源引线上的衰减量ΔV，使得驱动发光器件发光的驱动电流与衰减量ΔV无关。
以下将结合附图具体说明本发明实施例提供的技术方案。
参见图1，本发明实施例提供的像素电路包括：
充电子电路1、驱动子电路2和补偿子电路3；
驱动子电路2的第一端(A端)与第一参考电压源(Vref1)相连，第二端(B端)与发光器件D1的第一端相连，发光器件D1的第二端与补偿子电路3的第一端相连，补偿子电路3的第二端与第二参考电压源(Vref2)相连；驱动子电路2的第三端(C端)与充电子电路1相连。
补偿子电路3为发光器件D1的第二端提供参考电压Vref3，其中Vref3＝Vref2-ΔV。即补偿子电路3补偿了电源引线上的电压的衰减量ΔV，补偿子电路3输出的电压值是为发光器件的第二端提供的经过电压补偿后的电压值，
较佳地，发光器件D1可以为有机发光二极管OLED或其他发光器件。
需要说明的是，像素电路至少包括一个驱动晶体管，该驱动晶体管用于驱动发光器件发光，驱动晶体管可以为n型驱动晶体管或p型驱动晶体管。
当驱动晶体管为n型驱动晶体管时，第一参考电压源(Vref1)提供低电平电压Vss，第二参考电压源提供高电平电压Vdd，此时需要补偿第一参考电压源Vref1提供的电压Vss在电源引线上的衰减量ΔV；其中，发光器件D1的阴极(即发光器件的第一端)与驱动子电路相连，阳极(即发光器件的第二端)与第二参考电压源(Vref2)相连。
当驱动晶体管为p型驱动晶体管时，第一参考电压源Vref1提供高电平电压Vdd，第二参考电压源提供低电平电压Vss，此时需要补偿Vdd在电源引线上的衰减量ΔV。其中，发光器件D1的阳极(即发光器件的第一端)与驱动子电路2相连，阴极(即发光器件的第二端)与第二参考电压源(Vref2)相连。
以p型驱动晶体管为例，本发明第一参考电压源Vref1提供高电平电压Vdd，第二参考电压源Vref2提供低电平电压Vss，Vdd在连接驱动子电路的电源引线上的衰减值为ΔV；第一参考电压源Vref1实际加载在发光器件D1阳极的电压为Vdd-ΔV。
补偿子电路为发光器件的第二端提供电压Vref3＝Vss-ΔV，使得流过发光器件D1的驱动电流与((Vdd-ΔV)-(Vss-ΔV)-VData-Vth)2成正比，即与(Vdd--Vss-VData-Vth)2成正比，其中VData为充电子电路提供的数据信号电压，Vth为驱动子电路中的驱动晶体管的阈值电压。即补偿子电路补偿了Vdd在电源引线上的衰减值ΔV，使得流过发光器件的电流与Vdd在电源引线上的衰减值ΔV无关，即像素电路中发光器件的亮度不受Vdd在电源引线上的衰减值ΔV的影响。
在具体实施时，补偿子电路输出的参考电压Vref3＝Vss-ΔV为预设值，Vss-ΔV的大小可以预先通过经验值确定和目视效果确定。具体地，当某一像素单元对应区域的亮度较其他像素单元对应区域亮度较暗时，为该像素单元中的像素电路设置本发明所述补偿子电路，且根据经验值设置该补偿子电路输出一设定电压值，目测设置有补偿子电路的像素单元对应区域的亮度，且调整所述补偿子电路输出的电压值，直到设置该补偿子电路的像素单元对应区域亮度与其他像素单元对应区域的亮度一致时，确定补偿子电路输出的电压值为所述Vss-ΔV。当然，所述目视效果确定只是较常使用的方式之一，还可以采用仪器检测发光亮度进行确定，这里不做具体限定。
以n型驱动晶体管为例，本发明第一参考电压源Vref1提供低电平电压Vss，第二参考电压源Vref2提供高电平电压Vdd，Vss在连接驱动子电路的电源引线上的衰减值为ΔV；第一参考电压源Vref1实际加载在发光器件D1阴极的电压为Vss-ΔV。
补偿子电路为发光器件的第二端提供电压Vdd-ΔV，使得流过发光器件的驱动电流与((Vss-ΔV)-(Vdd-ΔV)-VData-Vth)2成正比，即与(Vss-Vdd-VData-Vth)2成正比，其中VData为充电子电路提供的数据信号电压，Vth为驱动子电路中的驱动晶体管的阈值电压。即补偿子电路补偿了Vss在电源引线上的衰减值ΔV，使得流过发光器件的电流与Vss在电源引线上的衰减值ΔV无关，即像素电路中发光器件的亮度不受Vss在电源引线上的衰减值ΔV的影响。
在具体实施时，补偿子电路输出的Vdd-ΔV为预设值，Vdd已知，ΔV的大小可以预先通过经验值确定和目视效果确定，与上述以p型驱动晶体管为例，的说明相同，此处不再赘述。
较佳地，本发明提供的补偿子电路可以但不限于为直流电压源，通过该直流电压源为发光器件D1的第二端提供参考电压Vref3。
所述直流电压源的正极端与所述第二参考电压源相连，负极端与所述发光器件的第二端相连，该直流电压源提供的电压Vref3低于所述第二参考电压源提供的电压Vref2。
较佳地，所述直流电压源为可调电压源。在具体实施时，通过目视效果和经验值调节补偿子电路输出的电压Vref2-ΔV值，使得所述发光器件D1发出的光线的亮度相比较其他发光器件的亮度较均匀。直流电压源为可调电压源时，输出的参考电压值Vref3更加灵活，对发光器件第二端电压ΔV的补偿更加灵活。
参见图2，本发明提供的驱动子电路2包括：
驱动晶体管T0和电容Cst；
其中，驱动晶体管T0的源极与第一参考电压源Vref1的输出端相连，漏极与发光器件D1的第一端相连，栅极与电容Cst的第一端(D端)以及充电子电路1相连；电容Cst的第二端(E端)与第一参考电压源Vref1的输出端相连。
充电子电路1包括：
开关晶体管T1、门信号源VGate和数据信号源VData。
开关晶体管T1的栅极与门信号源VGate相连，源极与数据信号源VData相连，漏极与电容Cst的第一端(D端)以及与驱动晶体管T0的栅极相连。
较佳地，所述像素电路中的驱动晶体管T0为p型驱动晶体管或n型驱动晶体管；图2中所示的像素电路，驱动晶体管T0为p型驱动晶体管，图3中所示的像素电路，驱动晶体管T0为n型驱动晶体管。
所述开关晶体管T1为n型或p型驱动晶体管。
需要说明的是，本发明实施例提供的像素电路不限于为上述提到的像素电路结构，例如，像素电路中不限于包括一个驱动晶体管，也可以包括两个或多个驱动晶体管，每一驱动晶体管构成一个驱动子电路，每一驱动子电路与一个或多个相互串联的发光器件相连，各驱动子电路轮流工作。任何包括本发明实施例提供的补偿子电路的像素电路，均包含在本发明的范围之内。
参见图4，本发明实施例还提供一种显示面板，包括由交叉排列的栅线Gate和数据线Data围设而成的像素单元，每一像素单元中设置有一个像素电路(Driving circuit)，和与该像素电路相连的发光器件(如图4中的发光二级管OLED)，所述像素电路用于驱动与之相连的发光器件发光显示。相应地，所述像素电路也呈矩阵分布，所述发光器件也呈矩阵分布。也就是说，各像素电路与发光器件一一对应相连。
图4中示出4条栅线(Gate(n)、Gate(n+1)、Gate(n+2)和Gate(n+3))和四条数据线(Data(m)、Data(m+1)、Data(m+2)和Data(m+3))。
其中，本发明的具备补偿子电路的像素电路可以设置在任何需要提供补偿电压的像素单元中，不需要提供补充电压的像素单元中可以设置其他像素电路。因此与各像素单元一一对应的像素电路至少之一为本发明实施例提供的像素电路，即本发明实施例提供的设置有补偿子电路的像素电路。有一部分像素电路可以为不设置所述补偿子电路的像素电路。
一般地，与像素电路相连的第一参考电压源、第二参考电压源和用于补偿电压的补偿子电路设置在显示面板的外围区域或柔性电路板上，即位于显示面板的非显示区域，且分别通过电源引线引接到多个像素电路，为了简化电路结构，如图4所示，所有像素电路(Driving circuit)或部分像素电路共用第一参考电压源和第二参考电压源。
一般地，显示面板上包括多条与每一列像素电路一一对应的沿列方向分布的电源引线，位于同一行上的像素电路分别与不同的电源引线一一对应相连，位于同一列的像素电路共用一条电源引线，各电源引线连接到同一第一参考电压源。各电源引线在位于同一行的像素电路处电压降相同，该电压降导致位于同一行的发光器件亮度变暗的程度相同，因此为该行所有像素电路设置补偿子电路，以补偿所述电压降。其中，可以为该行像素电路设置多个与每一像素电路一一对应相连的补偿子电路，也可以为各像素电路设置同一补偿子电路，即各像素电路共用一个补偿子电路。
第一参考电压源、第二参考电压源和补偿子电路分别提供第一参考电压Vref1、第二参考电压Vref2和补偿电压Vref2-ΔV。
图4中未体现第一参考电压源、第二参考电压源和补偿子电路。
需要说明的是，具体在哪一个像素电路设置补偿子电路需要根据实际需求而定，可以在距离第一参考电压源较远的某一行上的所有像素电路中设置补偿子电路或在某一像素电路中单独设置补偿子电路，只要保证整个显示面板上的各像素单元对应区域的出射光线亮度基本均匀即可。
在具体实施过程中，根据需求在不同行像素电路中设置所述补偿子电路。
较佳地，所述补偿子电路的引线可以为与栅极、栅线、数据线、源漏极、发光器件的阴极或阳极等电极或电极线的其中任一同层设置的引线，即在制作所述任一电极或电极线时，同时将所述补偿子电路的引线制作出来。
较佳地，所述补偿子电路的引线与发光器件的第二端相连，在具体实施时，当补偿子电路的引线与发光器件的第二端(阴极或阳极)位于不同层时，二者通过过孔连接。
本发明实施例还提供一种显示装置，包括上述显示面板。该显示装置可以为有机电致发光显示OLED面板、OLED显示器、OLED电视或电子纸等显示装置。
综上所述，本发明实施例提供的像素电路，在与像素电路相连的发光器件的阴极端设置补偿子电路，该补偿子电路用于补偿发光器件阳极端Vdd的衰减量ΔV，或阴极端的Vss的衰减量ΔV，使得驱动发光器件发光的驱动电流与衰减量ΔV无关。
需要说明的是，对于液晶显示领域的晶体管来说，漏极和源极没有明确的区别，因此本发明实施例中所提到的晶体管的源极可以为晶体管的漏极，晶体管的漏极也可以为晶体管的源极。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (10)

1.一种像素电路，其特征在于，包括：充电子电路、驱动子电路和补偿子电路；
所述驱动子电路的第一端通过电源引线与第一参考电压源相连，第二端与发光器件的第一端相连，发光器件的第二端与补偿子电路的第一端相连，补偿子电路的第二端与第二参考电压源相连；驱动子电路的第三端与充电子电路相连；
所述充电子电路用于在所述驱动子电路驱动所述发光器件发光之前为驱动子电路充电，所述补偿子电路用于在所述驱动子电路驱动所述发光器件发光时补偿所述第一参考电压源提供给所述驱动子电路的电压在所述电源引线上的电压降。
2.根据权利要求1所述的像素电路，其特征在于，所述补偿子电路为直流电压源，该直流电压源的正极端与所述第二参考电压源相连，负极端与所述发光器件的第二端相连，该直流电压源提供的电压低于所述第二参考电压源提供的电压。
3.根据权利要求2所述的像素电路，其特征在于，所述直流电压源为可调直流电压源。
4.根据权利要求1-3任一权项所述的像素电路，其特征在于，所述驱动子电路包括驱动晶体管和电容；所述充电子电路包括开关晶体管、数据信号源和门信号源；
其中，所述驱动晶体管的源极通过所述电源引线与第一参考电压源相连，漏极与发光器件的第一端相连，栅极与所述电容的第一端以及所述开关晶体管的漏极相连；所述电容的第二端与所述第一参考电压源相连；所述开关晶体管的栅极与所述门信号源相连，源极与数据信号源相连。
5.根据权利要求4所述的像素电路，其特征在于，所述驱动晶体管为n型驱动晶体管或p型驱动晶体管；
当所述驱动晶体管为n型驱动晶体管时，所述第一参考电压源为低电平电压源，所述第二参考电压源为高电平电压源，所述发光器件的阴极与所述驱动晶体管相连，阳极与所述直流电压源的负极端相连；
当所述驱动晶体管为p型驱动晶体管时，所述第一参考电压源为高电平电压源，所述第二参考电压源为低电平电压源，所述发光器件的阳极与所述驱动晶体管相连，阴极与所述直流电压源的负极端相连。
6.一种显示面板，其特征在于，包括呈矩阵排列的多个像素单元，每一像素单元中包括一个像素电路和与该像素电路相连的发光器件，该像素电路用于驱动所述发光器件发光；
其中，与所述多个像素单元一一对应的像素电路至少之一为权利要求1-5任一权项所述的具有补偿子电路的像素电路。
7.根据权利要求6所述的显示面板，其特征在于，与位于同一行的像素单元一一对应的像素电路为权利要求1-5任一权项所述的具有补偿子电路的像素电路。
8.根据权利要求7所述的显示面板，其特征在于，与位于同一行的像素单元一一对应的像素电路中的所述补偿子电路为同一补偿子电路。
9.根据权利要求8所述的显示面板，其特征在于，所述补偿子电路通过引线与发光器件相连，所述引线与显示面板中的栅极、栅线、数据线、源漏极、发光器件的阴极或阳极的其中任一同层设置。
10.一种显示装置，其特征在于，包括权利要求6-9任一权项所述的显示面板。
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