CN104658481B - 一种像素补偿电路、显示装置和驱动方法 - Google Patents

一种像素补偿电路、显示装置和驱动方法 Download PDF

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CN104658481B
CN104658481B CN201510106550.6A CN201510106550A CN104658481B CN 104658481 B CN104658481 B CN 104658481B CN 201510106550 A CN201510106550 A CN 201510106550A CN 104658481 B CN104658481 B CN 104658481B
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signal
voltage
driving transistor
transistor
luminous
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CN104658481A (zh
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孙拓
马占洁
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京东方科技集团股份有限公司
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3275Details of drivers for data electrodes
    • G09G3/3291Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
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    • G09G3/3225Control 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
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    • G09G3/3241Control 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 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • G09G3/325Control 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 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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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Abstract

本发明实施例提供了一种像素补偿电路、显示装置和驱动方法,用以解决由于低温多晶硅背板上的晶体管的阈值电压存在差异所导致的显示面板显示不均匀的问题。像素补偿电路中的数据信号加载模块在扫描信号为开启信号时,将数据信号加载到驱动晶体管的栅极,驱动信号生成模块能够在第一发光信号为关断信号、扫描信号为开启信号且所述电压加载模块停止向驱动晶体管的源极加载信号时,读取并存储驱动晶体管的阈值电压;并在扫描信号为关断信号、且第一发光信号和第二发光信号均为开启信号时,生成与驱动晶体管的阈值电压相关的驱动信号,驱动晶体管根据所述驱动信号生成漏极电流,以驱动有机发光二极管发光。

Description

一种像素补偿电路、显示装置和驱动方法

技术领域

[0001] 本发明涉及显示技术领域,尤其涉及一种像素补偿电路、显示装置和驱动方法。

背景技术

[0002] 有源矩阵有机发光二极管(Active Matrix Organic Light Emitting Diode, AMOLED)显示器因具有视角广、色彩对比效果好、响应速度快以及自发光等优点,因此获得 了广泛应用。

[0003] AM0IED多采用低温多晶硅作为驱动层实现其像素驱动电路,与一般非晶硅工艺相 比,低温多晶硅薄膜晶体管具有更高的迀移率和更稳定的特性,更适用于AMOLED显示。

[0004] 但是,低温多晶硅背板由于背板工艺和多晶硅的特性不可避免的会使得距离很近 的晶体管的阈值电压存在差异,这会导致不同像素接收到相同的数据信号时,显示亮度不 同,从而导致显示面板显示不均匀。

发明内容

[0005] 本发明实施例提供了一种像素补偿电路、显示装置和驱动方法,用以解决由于低 温多晶硅背板上的晶体管的阈值电压存在差异所导致的显示面板显示不均匀的问题。

[0006] 基于上述问题,本发明实施例提供的一种像素补偿电路,包括驱动信号生成模块、 数据信号加载模块、电压加载模块、有机发光二极管和驱动晶体管;

[0007]所述数据信号加载模块,用于在扫描信号为开启信号时,将数据信号加载到驱动 晶体管的栅极;

[0008] 所述电压加载模块,用于在所述第一发光信号和所述扫描信号均为开启信号时, 将第一电压信号加载到驱动晶体管的源极,所述第一电压信号的电压高于所述数据信号的 电压,所述第一电压信号的电压高于所述有机发光二极管的阴极接收到的第二电压信号的 电压;并在第二发光信号为开启信号时,将所述第三电压信号加载到驱动晶体管的源极;

[0009] 所述驱动信号生成模块,用于存储所述驱动晶体管的源极的信号、所述驱动晶体 管的栅极的信号和第三电压信号;并在第一发光信号和扫描信号均为开启信号时,存储所 述数据信号;以及在第一发光信号为关断信号、扫描信号为开启信号且所述电压加载模块 停止向驱动晶体管的源极加载信号时,根据所述驱动晶体管的栅极的信号生成所述驱动晶 体管的源极的信号,所述驱动晶体管的源极的信号与所述驱动晶体管的阈值电压相关;并 在扫描信号和第一发光信号均为关断信号、且第二发光信号为开启信号时,接收所述电压 加载模块向所述驱动晶体管的源极加载的第三电压信号;以及在扫描信号为关断信号、且 第一发光信号和第二发光信号均为开启信号时,根据所述驱动晶体管的源极的信号、所述 驱动晶体管的栅极的信号、所述数据信号和所述第三电压信号生成驱动信号,所述驱动信 号用于驱动所述有机发光二极管发光。

[0010] 本发明实施例提供的一种显示装置,包括本发明实施例提供的像素补偿电路。

[0011] 本发明实施例提供的一种驱动方法,应用于本发明实施例提供的像素补偿电路, 包括:

[0012] 所述数据信号加载模块在扫描信号为开启信号时,将数据信号加载到驱动晶体管 的栅极;

[0013] 所述电压加载模块在所述第一发光信号和所述扫描信号均为开启信号时,将第一 电压信号加载到驱动晶体管的源极,所述第一电压信号的电压高于所述数据信号的电压, 所述第一电压信号的电压高于所述有机发光二极管的阴极接收到的第二电压信号的电压; 并在第二发光信号为开启信号时,将所述第三电压信号加载到驱动晶体管的源极;

[0014] 所述驱动信号生成模块存储所述驱动晶体管的源极的信号、所述驱动晶体管的栅 极的信号和第三电压信号;并在第一发光信号和扫描信号均为开启信号时,存储所述数据 信号;以及在第一发光信号为关断信号、扫描信号为开启信号且所述电压加载模块停止向 驱动晶体管的源极加载信号时,根据所述驱动晶体管的栅极的信号生成所述驱动晶体管的 源极的信号,所述驱动晶体管的源极的信号与所述驱动晶体管的阈值电压相关;并在扫描 信号和第一发光信号均为关断信号、且第二发光信号为开启信号时,接收所述电压加载模 块向所述驱动晶体管的源极加载的第三电压信号;以及在扫描信号为关断信号、且第一发 光信号和第二发光信号均为开启信号时,根据所述驱动晶体管的源极的信号、所述驱动晶 体管的栅极的信号、所述数据信号和所述第三电压信号生成驱动信号,所述驱动信号用于 驱动所述有机发光二极管发光。

[0015] 本发明实施例的有益效果包括:

[0016] 本发明实施例提供的像素补偿电路、显示装置和驱动方法,由于驱动信号生成模 块能够在第一发光信号为关断信号、扫描信号为开启信号且所述电压加载模块停止向驱动 晶体管的源极加载信号时,根据所述驱动晶体管的栅极的信号生成所述驱动晶体管的源极 的信号,所述驱动晶体管的源极的信号与其阈值电压相关;并在扫描信号为关断信号、且第 一发光信号和第二发光信号均为开启信号时,根据所述驱动晶体管的源极的信号、所述驱 动晶体管的栅极的信号、所述数据信号和所述第三电压信号生成驱动信号,驱动晶体管根 据所述驱动信号生成漏极电流,以驱动有机发光二极管发光,这样可以降低驱动晶体管的 阈值电压的差异对驱动晶体管的漏极电流的影响,从而降低阈值电压差异所导致的显示面 板显示的不均匀性。

附图说明

[0017] 图1为本发明实施例提供的像素补偿电路的结构示意图之一;

[0018] 图2为本发明实施例提供的像素补偿电路的结构示意图之二;

[0019] 图3为本发明实施例提供的像素补偿电路的结构示意图之三;

[0020] 图4为本发明实施例提供的像素补偿电路的结构示意图之四;

[0021] 图5为图3所示的像素补偿电路的工作时序图;

[0022]图6为图4所示的像素补偿电路的工作时序图。

具体实施方式

[0023]本发明实施例提供的像素补偿电路、显示装置和驱动方法,驱动信号生成模块能 够在第一发光信号为关断信号、扫描信号为开启信号且所述电压加载模块停止向驱动晶体 管的源极加载信号时,读取并存储驱动晶体管的阈值电压;并在扫描信号为关断信号、且第 一发光信号和第二发光信号均为开启信号时,生成与驱动晶体管的阈值电压相关的驱动信 号,驱动晶体管根据所述驱动信号生成漏极电流,以驱动有机发光二极管发光,这样可以降 低驱动晶体管的阈值电压的差异对驱动晶体管的漏极电流的影响,从而降低阈值电压差异 所导致的显示面板显示的不均匀性。

[0024] 本发明实施例提供的像素补偿电路中的晶体管可以为p型晶体管,也可以为η型晶 体管;当像素补偿电路中的晶体管为Ρ型晶体管时,开启信号为低电平信号,关断信号为高 电平信号;当像素补偿电路中的晶体管为η型晶体管时,开启信号为高电平信号,关断信号 为低电平信号。无论像素补偿电路中的晶体管为Ρ型晶体管,还是为η型晶体管,像素补偿电 路的电路逻辑都是相同,因此,下面仅以像素补偿电路中的晶体管为Ρ型晶体管为例进行说 明,由η型晶体管构成的像素补偿电路的工作原理与由ρ型晶体管构成的像素补偿电路的工 作原理类似,在此不再赘述。

[0025] 下面结合说明书附图,对本发明实施例提供的一种像素补偿电路、显示装置及驱 动方法的具体实施方式进行说明。

[0026] 本发明实施例提供的一种像素补偿电路方法,如图1或图2所示,包括驱动信号生 成模块13、数据信号加载模块11、电压加载模块12、有机发光二极管D和驱动晶体管Td;

[0027] 数据信号加载模块11,用于在扫描信号Scan为开启信号时,将数据信号Data加载 到驱动晶体管Td的栅极;

[0028] 电压加载模块12,用于在第一发光信号Eml和扫描信号Scan均为开启信号时,将第 一电压信号VI加载到驱动晶体管Td的源极,第一电压信号VI的电压高于数据信号Data的电 压,第一电压信号VI的电压高于有机发光二极管D的阴极接收到的第二电压信号V2的电压; 并在第二发光信号Em2为开启信号时,将第三电压信号V3加载到驱动晶体管Td的源极; [0029]其中,在图1中,第一电压信号VI与第三电压信号V3相同,在第一发光信号Eml和扫 描信号Scan均为开启信号时,第二发光信号Em2为开启信号;在图2中,第一电压信号VI与第 三电压信号V3不相同,在第一发光信号Eml和扫描信号Scan均为开启信号时,复位信号 Reset为开启信号;

[0030] 驱动信号生成模块13,用于存储驱动晶体管Td的源极的信号、驱动晶体管Td的栅 极的信号和第三电压信号V3;并在第一发光信号Eml和扫描信号Scan均为开启信号时,存储 数据信号Data;以及在第一发光信号Eml为关断信号、扫描信号Scan为开启信号且电压加载 模块12停止向驱动晶体管Td的源极加载信号时,根据驱动晶体管Td的栅极的信号生成驱动 晶体管Td的源极的信号,驱动晶体管Td的源极的信号与驱动晶体管Td的阈值电压Vth相关; 并在扫描信号Scan和第一发光信号Eml均为关断信号、且第二发光信号Em2为开启信号时, 接收电压加载模块12向驱动晶体管Td的源极加载的第三电压信号V3;以及在扫描信号Scan 为关断信号、且第一发光信号Eml和第二发光信号Em2均为开启信号时,根据驱动晶体管Td 的源极的信号、驱动晶体管Td的栅极的信号、数据信号Data和第三电压信号V3生成驱动信 号,所述驱动信号用于驱动所述有机发光二极管发光。

[0031] 可选地,驱动信号生成模块包括第一电容、第二电容和第四晶体管,此时,图1所示 的像素补偿电路如图3所示,图2所示的像素补偿电路如图4所示;第一电容C1连接在驱动晶 体管Td的源极和驱动晶体管Td的栅极之间;第四晶体管T4的栅极接收第一发光信号VI,第 四晶体管T4的第一极连接驱动晶体管Td的栅极,第四晶体管T4的第二极通过第二电容C2接 收第三电压信号V3;在图3中,第一电压信号VI和第三电压信号V3均为信号VDD;在图4中,第 一电压信号VI为信号Ref。

[0032] 图3所示的像素补偿电路的工作时序如图5所示,在图5中,开启信号为低电平信 号,关断信号为高电平信号。

[0033] 在图5中,在第一发光信号Eml和扫描信号Scan均为开启信号时,即时段i时,驱动 晶体管Td的栅极的信号,即B点的信号为数据信号Data,并且驱动信号生成模块会存储数据 信号Data,驱动晶体管Td的源极,即A点的信号为VDD。在第一发光信号Eml为关断信号、扫描 信号Scan为开启信号且电压加载模块12停止向驱动晶体管Td的源极加载信号时,即时段ii 时,由于驱动晶体管Td的源极的信号,即信号VDD的电压Vdd高于数据信号Data的电压 Vdata,并高于有机发光二极管D的阴极接收到的第二电压信号V2的电压,因此,驱动晶体管 Td与有机发光二极管D构成放电通道,驱动晶体管Td的源极,即A点的电压降至Vdata+Vth, 由于扫描信号Scan为开启信号,因此,驱动晶体管Td的栅极,即B点的电压依然为Vdata。在 扫描信号Scan和第一发光信号Eml均为关断信号、且第二发光信号Em2为开启信号时,即时 段iii时,接收电压加载模块12向驱动晶体管Td的源极加载的信号VDD,那么,A点的电压由 Vdata+Vth变为Vdd,由于驱动信号生成模块13中用于存储驱动晶体管Td的源极的信号(A点 的信号)、驱动晶体管Td的栅极的信号(B点的信号)的电容,即第一电容C1的耦合作用,B点 的电压由Vdata变为Vdd-Vth。在扫描信号Scan为关断信号、且第一发光信号Eml和第二发光 信号Em2均为开启信号时,即时段iv时,由于第四晶体管T4导通,因此,第一电容C1和第二电 容C2极板相连接,二者之间会有电荷的流动,根据电荷守恒定律,B点的电位Vb为:

Figure CN104658481BD00071

[0035]此时,B点的信号也就是驱动信号,驱动晶体管Td会根据A点的信号,也就是信号 VDD,以及B点的信号,生成漏极电流Id,以驱动有机发光二极管D发光,其中Id为:

Figure CN104658481BD00072

[0037]其中K是与驱动晶体管的结构参数相关的常数,由于Vdd和Vth都是相对确定的,因 此想要达到需要的漏极电流就需要调整Vdata的值,相同的电流区间对应的Vdata的范围增 大。同时由于Vdata范围的增加,相应Vth和Vdd的波动对最终的漏极电流Id的影响相应的会 变小,从而达到部分补偿Vdd和Vth的作用,即达到部分补偿阈值电压偏差的作用。

[0038]由于在某些情况下,数据信号Data的电压Vdata有可能高于Vdd,为了确保驱动晶 体管Td能够导通,从而构成放电通路以读取驱动晶体管的阈值电压,因此,本发明实施例提 供的另一种像素补偿电路,图4所示的像素补偿电路是要在第一发光信号Eml和扫描信号 Scan均为开启信号时,在驱动晶体管Td的源极加载参考信号Ref,参考信号Ref的电压Vref 可以设置的足够高,从而确保在第一发光信号Eml为关断信号、扫描信号Scan为开启信号且 电压加载模块12停止向驱动晶体管Td的源极加载信号时,驱动晶体管Td能够导通,以构成 放电通道,读取驱动晶体管的阈值电压。

[0039]图4所示的像素补偿电路的工作时序如图6所示,在图6中,开启信号为低电平信 号,关断信号为高电平信号。

[0040]在图6中,在第一发光信号Eml和扫描信号Scan均为开启信号时,即时段i时,复位 信号Reset为开启信号,驱动晶体管Td的栅极的信号,即B点的信号为数据信号Data,并且驱 动信号生成模块会存储数据信号Data,驱动晶体管Td的源极,即A点的信号为Vref。在第一 发光信号Eml为关断信号、扫描信号Scan为开启信号且电压加载模块12停止向驱动晶体管 Td的源极加载信号时,即时段ii时,由于驱动晶体管Td的源极的信号,即参考信号Ref的电 压Vref高于数据信号Data的电压Vdata,并高于有机发光二极管D的阴极接收到的第二电压 信号V2的电压,因此,驱动晶体管Td与有机发光二极管D构成放电通道,驱动晶体管Td的源 极,即A点的电压降至Vdata+Vth,由于扫描信号Scan为开启信号,因此,驱动晶体管Td的栅 极,即B点的电压依然为Vdata。在扫描信号Scan和第一发光信号Eml均为关断信号、且第二 发光信号Em2为开启信号时,即时段iii时,接收电压加载模块12向驱动晶体管Td的源极加 载的信号VDD,那么,A点的电压由Vdata+Vth变为Vdd,由于驱动信号生成模块13中用于存储 驱动晶体管Td的源极的信号(A点的信号)、驱动晶体管Td的栅极的信号(B点的信号)的电 容,即第一电容C1的耦合作用,B点的电压由Vdata变为Vdd-Vth。在扫描信号Scan为关断信 号、且第一发光信号Eml和第二发光信号Em2均为开启信号时,即时段iv时,由于第四晶体管 T4导通,因此,第一电容C1和第二电容C2极板相连接,二者之间会有电荷的流动,根据电荷 守恒定律,B点的电位Vb为:

Figure CN104658481BD00081

[0042]此时,B点的信号也就是驱动信号,驱动晶体管Td会根据A点的信号,也就是信号 VDD,以及B点的信号,生成漏极电流Id,以驱动有机发光二极管D发光,其中Id为:

Figure CN104658481BD00082

[0044]其中K是与驱动晶体管的结构参数相关的常数,由于Vdd和Vth都是相对确定的,因 此想要达到需要的漏极电流就需要调整Vdata的值,相同的电流区间对应的Vdata的范围增 大。同时由于Vdata范围的增加,相应Vth和Vdd的波动对最终的漏极电流Id的影响相应的会 变小,从而达到部分补偿Vdd和Vth的作用,即达到部分补偿阈值电压偏差的作用。

[0045] 可选地,图1所示的像素补偿电路中的电压加载模块如图3所示,包括第一晶体管 T1;第一晶体管T1的栅极接收第二发光信号Em2,第一晶体管T1的第一极接收第三电压信号 V3,第一晶体管T1的第二极连接驱动晶体管Td的源极。此时,第一电压信号VI与第三电压信 号V3相同,均为信号VDD。

[0046] 可选地,图1所示的像素补偿电路中的电压加载模块如图4所示,包括第二晶体管 T2和第三晶体管T3;第二晶体管T2的栅极接收第二发光信号Em2,第二晶体管T2的第一极接 收第三电压信号V3,第二晶体管T2的第二极连接驱动晶体管Td的源极;第三晶体管T3的栅 极接收复位信号Reset,第三晶体管T3的第一极接收第一电压信号VI,所述第三晶体管的第 二极连接所述驱动晶体管的源极。此时,第一电压信号VI与第三电压信号V3不同,第一电压 信号VI为信号VDD,第三电压信号V3为参考信号Ref。

[0047] 可选地,图1所示的像素补偿电路中的数据信号加载模块如图3所示,图2所示的像 素补偿电路中的数据信号加载模块如图4所示,均包括第五晶体管T5;第五晶体管T5的栅极 接收扫描信号Scan,第五晶体管T5的第一极接收数据信号Data,第五晶体管T5的第二极连 接驱动晶体管Td的栅极。

[0048] 本发明实施例提供的一种显示装置,包括本发明实施例提供的像素补偿电路。

[0049] 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第一极可以为晶体管的源极(或漏极),晶体管的第二极可以为晶体 管的漏极(或源极)。如果晶体管的源极为第一极,那么该晶体管的漏极为第二极;如果晶体 管的漏极为第一极,那么晶体管的源极为第二极。

[0050] 本发明实施例提供的一种驱动方法,应用于本发明实施例提供的像素补偿电路, 包括:

[0051] 所述数据信号加载模块在扫描信号为开启信号时,将数据信号加载到驱动晶体管 的栅极;

[0052]所述电压加载模块在所述第一发光信号和所述扫描信号均为开启信号时,将第一 电压信号加载到驱动晶体管的源极,所述第一电压信号的电压高于所述数据信号的电压, 所述第一电压信号的电压高于所述有机发光二极管的阴极接收到的第二电压信号的电压; 并在第二发光信号为开启信号时,将所述第三电压信号加载到驱动晶体管的源极;

[0053]所述驱动信号生成模块存储所述驱动晶体管的源极的信号、所述驱动晶体管的栅 极的信号和第三电压信号;并在第一发光信号和扫描信号均为开启信号时,存储所述数据 信号;以及在第一发光信号为关断信号、扫描信号为开启信号且所述电压加载模块停止向 驱动晶体管的源极加载信号时,根据所述驱动晶体管的栅极的信号生成所述驱动晶体管的 源极的信号,所述驱动晶体管的源极的信号与所述驱动晶体管的阈值电压相关;并在扫描 信号和第一发光信号均为关断信号、且第二发光信号为开启信号时,接收所述电压加载模 块向所述驱动晶体管的源极加载的第三电压信号;以及在扫描信号为关断信号、且第一发 光信号和第二发光信号均为开启信号时,根据所述驱动晶体管的源极的信号、所述驱动晶 体管的栅极的信号、所述数据信号和所述第三电压信号生成驱动信号,所述驱动信号用于 驱动所述有机发光二极管发光。

[0054]可选地,所述第一电压信号与所述第三电压信号相同;在所述第一发光信号和所 述扫描信号均为开启信号时,所述第二发光信号为开启信号。

[0055] 可选地,所述第一电压信号与所述第三电压信号不同;所述电压加载模块还接收 复位信号,在所述第一发光信号和所述扫描信号均为开启信号时,所述复位信号为关断信 号。

[0056] 本领域技术人员可以理解附图只是一个优选实施例的示意图,附图中的模块或流 程并不一定是实施本发明所必须的。

[0057] 本领域技术人员可以理解实施例中的装置中的模块可以按照实施例描述进行分 布于实施例的装置中,也可以进行相应变化位于不同于本实施例的一个或多个装置中。上 述实施例的模块可以合并为一个模块,也可以进一步拆分成多个子模块。

[0058]上述本发明实施例序号仅仅为了描述,不代表实施例的优劣。

[0059]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 (12)

1. 一种像素补偿电路,其特征在于,包括驱动信号生成模块、数据信号加载模块、电压 加载模块、有机发光二极管和驱动晶体管; 所述数据信号加载模块,用于在扫描信号为开启信号时,将数据信号加载到驱动晶体 管的栅极; 所述电压加载模块,用于在第一发光信号和所述扫描信号均为开启信号时,将第一电 压信号加载到驱动晶体管的源极,所述第一电压信号的电压高于所述数据信号的电压,所 述第一电压信号的电压高于所述有机发光二极管的阴极接收到的第二电压信号的电压;并 在第二发光信号为开启信号时,将第三电压信号加载到驱动晶体管的源极; 所述驱动信号生成模块,用于存储所述驱动晶体管的源极的信号、所述驱动晶体管的 栅极的信号和第三电压信号;并在第一发光信号和扫描信号均为开启信号时,存储所述数 据信号;以及在第一发光信号为关断信号、扫描信号为开启信号且所述电压加载模块停止 向驱动晶体管的源极加载信号时,根据所述驱动晶体管的栅极的信号生成所述驱动晶体管 的源极的信号,所述驱动晶体管的源极的信号与所述驱动晶体管的阈值电压相关;并在扫 描信号和第一发光信号均为关断信号、且第二发光信号为开启信号时,接收所述电压加载 模块向所述驱动晶体管的源极加载的第三电压信号;以及在扫描信号为关断信号、且第一 发光信号和第二发光信号均为开启信号时,根据所述驱动晶体管的源极的信号、所述驱动 晶体管的栅极的信号、所述数据信号和所述第三电压信号生成驱动信号,所述驱动信号用 于驱动所述有机发光二极管发光。
2. 如权利要求1所述的像素补偿电路,其特征在于,所述第一电压信号与所述第三电压 信号相同;在所述第一发光信号和所述扫描信号均为开启信号时,所述第二发光信号为开 启信号。
3. 如权利要求2所述的像素补偿电路,其特征在于,所述电压加载模块包括第一晶体 管; 所述第一晶体管的栅极接收所述第二发光信号,所述第一晶体管的第一极接收所述第 三电压信号,所述第一晶体管的第二极连接所述驱动晶体管的源极。
4. 如权利要求1所述的像素补偿电路,其特征在于,所述第一电压信号与所述第三电压 信号不同;所述电压加载模块还接收复位信号,在所述第一发光信号和所述扫描信号均为 开启信号时,所述复位信号为开启信号。
5. 如权利要求4所述的像素补偿电路,其特征在于,所述电压加载模块包括第二晶体管 和第三晶体管; 所述第二晶体管的栅极接收所述第二发光信号,所述第二晶体管的第一极接收所述第 三电压信号,所述第二晶体管的第二极连接所述驱动晶体管的源极; 所述第三晶体管的栅极接收所述复位信号,所述第三晶体管的第一极接收所述第一电 压信号,所述第三晶体管的第二极连接所述驱动晶体管的源极。
6. 如权利要求1所述的像素补偿电路,其特征在于,所述驱动信号生成模块包括第一电 容、第二电容和第四晶体管; 所述第一电容连接在所述驱动晶体管的源极和所述驱动晶体管的栅极之间; 所述第四晶体管的栅极接收所述第一发光信号,所述第四晶体管的第一极连接所述驱 动晶体管的栅极,所述第四晶体管的第二极通过所述第二电容接收第三电压信号。
7. 如权利要求1所述的像素补偿电路,其特征在于,所述数据信号加载模块包括第五晶 体管; 所述第五晶体管的栅极接收所述扫描信号,所述第五晶体管的第一极接收所述数据信 号,所述第五晶体管的第二极连接所述驱动晶体管的栅极。
8. 如权利要求1所述的像素补偿电路,其特征在于,所述开启信号为低电平信号,所述 关断信号为高电平信号。
9. 一种显示装置,其特征在于,包括如权利要求1~8任一所述的像素补偿电路。
10. -种驱动方法,其特征在于,应用于权利要求1~8任一所述的像素补偿电路,包括: 所述数据信号加载模块在扫描信号为开启信号时,将数据信号加载到驱动晶体管的栅 极; 所述电压加载模块在所述第一发光信号和所述扫描信号均为开启信号时,将第一电压 信号加载到驱动晶体管的源极,所述第一电压信号的电压高于所述数据信号的电压,所述 第一电压信号的电压高于所述有机发光二极管的阴极接收到的第二电压信号的电压;并在 第二发光信号为开启信号时,将所述第三电压信号加载到驱动晶体管的源极; 所述驱动信号生成模块存储所述驱动晶体管的源极的信号、所述驱动晶体管的栅极的 信号和第三电压信号;并在第一发光信号和扫描信号均为开启信号时,存储所述数据信号; 以及在第一发光信号为关断信号、扫描信号为开启信号且所述电压加载模块停止向驱动晶 体管的源极加载信号时,根据所述驱动晶体管的栅极的信号生成所述驱动晶体管的源极的 信号,所述驱动晶体管的源极的信号与所述驱动晶体管的阈值电压相关;并在扫描信号和 第一发光信号均为关断信号、且第二发光信号为开启信号时,接收所述电压加载模块向所 述驱动晶体管的源极加载的第三电压信号;以及在扫描信号为关断信号、且第一发光信号 和第二发光信号均为开启信号时,根据所述驱动晶体管的源极的信号、所述驱动晶体管的 栅极的信号、所述数据信号和所述第三电压信号生成驱动信号,所述驱动信号用于驱动所 述有机发光二极管发光。
11. 如权利要求10所述的方法,其特征在于,所述第一电压信号与所述第三电压信号相 同;在所述第一发光信号和所述扫描信号均为开启信号时,所述第二发光信号为开启信号。
12. 如权利要求10所述的方法,其特征在于,所述第一电压信号与所述第三电压信号不 同;所述电压加载模块还接收复位信号,在所述第一发光信号和所述扫描信号均为开启信 号时,所述复位信号为开启信号。
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