CN104882099A - 一种像素驱动电路、阵列基板和显示装置 - Google Patents

一种像素驱动电路、阵列基板和显示装置 Download PDF

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CN104882099A
CN104882099A CN201510317207.6A CN201510317207A CN104882099A CN 104882099 A CN104882099 A CN 104882099A CN 201510317207 A CN201510317207 A CN 201510317207A CN 104882099 A CN104882099 A CN 104882099A
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transistor
module
signal
pole
control
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CN104882099B (zh
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盖翠丽
曹昆
张保侠
李永谦
李全虎
王龙彦
尹静文
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BOE Technology Group Co Ltd
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Priority to US15/116,624 priority patent/US10276098B2/en
Priority to PCT/CN2015/093393 priority patent/WO2016197525A1/zh
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    • 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]
    • G09G3/3225Control 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
    • G09G3/3258Control 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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    • 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
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    • 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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    • G09G3/22Control 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
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    • 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
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
    • H01L27/12Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/1255Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs integrated with passive devices, e.g. auxiliary capacitors
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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    • H10K59/131Interconnections, e.g. wiring lines or terminals
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Abstract

本发明的实施例提供一种像素驱动电路、阵列基板和显示装置,涉及显示技术领域,解决了驱动晶体管阈值电压的不稳定性造成电流差异的问题,避免出现显示器件亮度不均匀,增强了显示器件的显示效果。包括:补偿模块连接扫描信号、数据信号和参考信号,补偿模块与控制模块和驱动模块连接;控制模块连接发光控制信号和电源信号,控制模块与驱动模块和发光模块连接;发光模块一端与驱动模块连接,另一端接地;补偿模块在扫描信号控制下接收数据信号和参考信号,在控制模块的控制下补偿驱动模块的阈值电压;控制模块在发光控制信号控制下接收电源信号控制补偿模块对驱动模块的阈值电压进行补偿;驱动模块在控制模块的控制下驱动发光模块发光。

Description

一种像素驱动电路、阵列基板和显示装置
技术领域
本发明涉及显示技术领域,尤其涉及一种像素驱动电路、阵列基板和显示装置。
背景技术
有机发光二极管(Organic Light Emitting Diode,简称OLED)作为一种电流型发光器件,因其所具有的自发光、快速响应、宽视角和可制作在柔性衬底上等特点而越来越多地被应用于高性能显示领域当中。OLED按驱动方式可分为无源矩阵驱动有机发光二极管(Passive Matrix Driving OLED,简称PMOLED)和有源矩阵驱动有机发光二极管(Active Matrix Driving OLED,简称AMOLED)两种。传统的PMOLED随着显示装置尺寸的增大,需要降低单个像素的驱动时间,因而需要增大瞬态电流,从而导致功耗上升;同时,会使OLED的工作电压过高,导致工作效率下降。而AMOLED技术中,每个OLED均通过薄膜晶体管(Thin Film Transistor,简称TFT)开关电路逐行扫描输入电流,可以很好地解决上述问题。
在现有的AMOLED面板中,TFT开关电路多采用低温多晶硅薄膜晶体管(LTPS TFT)或氧化物薄膜晶体管(Oxide TFT)。与一般的非晶硅薄膜晶体管(amorphous-Si TFT)相比,LTPS TFT和Oxide TFT具有更高的迁移率和更稳定的特性,更适合应用于AMOLED显示中。但是由于晶化工艺和制作水平的限制,导致在大面积玻璃基板上制作的TFT开关电路常常在诸如阈值电压、迁移率等电学参数上出现非均匀性,从而使得各个TFT的阈值电压偏移不一致;另外,在长时间加压和高温下也会导致TFT的阈值电压出现漂移,由于显示画面不同,面板各部分TFT的阈值漂移量不同,从而造成显示亮度差异,会出现残影现象。还会导致驱动二极管的电流不稳定,进而导致OLED显示器件的亮度差异,出现亮度不均匀的问题,影响显示器件的显示效果。
发明内容
本发明的实施例提供一种像素驱动电路、阵列基板和显示装置,解决了驱动晶体管阈值电压的不稳定性造成的电流差异的问题,避免出现显示器件亮度不均匀的问题,增强了显示器件的显示效果。
为达到上述目的,本发明的实施例采用如下技术方案:
第一方面,提供一种像素驱动电路,所述像素驱动电路包括:补偿模块、控制模块、驱动模块、发光模块,其中:
所述补偿模块连接有扫描信号、数据信号和参考信号,所述补偿模块还与所述控制模块和所述驱动模块连接;
所述控制模块连接有发光控制信号和电源信号,所述控制模块还与所述驱动模块和所述发光模块连接;
所述发光模块的一端与所述驱动模块连接,所述发光模块的另一端接地;
所述补偿模块,用于在所述扫描信号的控制下接收所述数据信号和参考信号,在所述控制模块的控制下补偿所述驱动模块的阈值电压;
所述控制模块,用于在所述发光控制信号的控制下接收所述电源信号,控制所述补偿模块对所述驱动模块的阈值电压进行补偿;
所述驱动模块,用于在所述控制模块的控制下驱动所述发光模块发光。
可选的,所述补偿模块包括:
第一晶体管,所述第一晶体管的栅极与扫描信号连接,所述第一晶体管的第一极与数据信号连接,所述第一晶体管的第二极与所述控制模块连接;
第二晶体管,所述第二晶体管的栅极与扫描信号连接,所述第二晶体管的第一极与参考信号连接,所述第二晶体管的第二极与第一电容的第二端连接;
第一电容,所述第一电容的第一端与所述第一晶体管的第二极连接;
第二电容,所述第二电容的第一端与所述第二晶体管的第二极连接,所述第二电容的第二端与第三晶体管的第二极连接;
第三晶体管,所述第三晶体管的栅极与所述扫描信号连接,所述第三晶体管的第一极与所述控制模块和所述驱动模块连接,所述第三晶体管的第二极与所述驱动模块连接。
可选的,所述控制模块包括:
第四晶体管,所述第四晶体管的栅极与所述发光控制信号连接,所述第四晶体管的第一极与所述电源信号连接,所述第四晶体管的第二极与所述驱动模块和所述补偿模块连接;
第六晶体管,所述第六晶体管的栅极与所述发光控制信号连接,所述第六晶体管的第一极与所述补偿模块连接,所述第六晶体管的第二极与所述驱动模块和所述发光模块连接。
可选的,所述驱动模块包括:第五晶体管,其中:
所述第五晶体管的栅极与所述补偿模块连接,所述第五晶体管的第一极与所述补偿模块和所述控制模块连接,所述第五晶体管的第二极与所述控制模块和所述发光模块连接。
可选的,所述发光模块包括:有机发光二极管,其中:
所述有机发光二极管的输入端与所述控制模块和所述驱动模块连接,所述有机发光二极管的输出端接地。
可选的,所述第一晶体管、所述第二晶体管和所述第三晶体管同为N型晶体管或者同为P型晶体管。
可选的,所述第四晶体管和所述第六晶体管同为N型晶体管或者同为P型晶体管。
可选的,所述第五晶体管为N型晶体管。
第二方面,提供一种阵列基板,所述阵列基板包括第一方面所述的任一像素驱动电路。
第三方面,提供一种显示装置,所述显示装置包括第二方面所述的阵列基板。
本发明的实施例提供的像素驱动电路、阵列基板和显示装置,通过补偿模块在扫描信号的控制下接收数据信号和参考信号,控制模块在发光控制信号的控制下接收电源信号,实现控制模块控制补偿模块对驱动晶体管的阈值电压进行补偿,解决了驱动晶体管阈值电压的不稳定性造成的电流差异的问题,避免出现显示器件亮度不均匀的问题,增强了显示器件的显示效果。
附图说明
为了更清楚地说明本发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地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,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为本发明的实施例提供的一种像素驱动电路的结构示意图;
图2为本发明的实施例提供的另一种像素驱动电路的结构示意图;
图3为本发明的实施例提供的一种像素驱动电路的工作时序图;
图4为本发明的实施例提供的一种像素驱动电路在补偿阶段的等效电路的结构示意图;
图5为本发明的实施例提供的一种像素驱动电路在发光阶段的等效电路的结构示意图;
图6为本发明的实施例的像素驱动电路中的有机发光二极管的初始电压的特征曲线图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
本发明的实施例提供一种像素驱动电路,参照图1所示,该像素驱动电路包括:补偿模块11、控制模块12、驱动模块13、发光模块14,其中:
补偿模块11连接有扫描信号Scan、数据信号Vdata和参考信号VREF,补偿模块11还与控制模块12和驱动模块13连接。
控制模块12连接有发光控制信号EM和电源信号ELVDD,控制模块12还与驱动模块13和发光模块14连接。
发光模块14的一端与驱动模块13连接,发光模块14的另一端接地。
补偿模块11,用于在扫描信号Scan的控制下接收数据信号Vdata和参考信号VREF,在所述控制模块的控制下补偿驱动模块13的阈值电压。
控制模块12,用于在发光控制信号EM的控制下接收电源信号ELVDD,控制所述补偿模块对所述驱动模块的阈值电压进行补偿;
驱动模块13,用于在控制模块12的控制下驱动发光模块14发光。
本发明的实施例提供的像素驱动电路,通过补偿模块在扫描信号的控制下接收数据信号和参考信号,控制模块在发光控制信号的控制下接收电源信号,实现控制模块控制补偿模块对驱动晶体管的阈值电压进行补偿,解决了驱动晶体管阈值电压的不稳定性造成的电流差异的问题,避免出现显示器件亮度不均匀的问题,增强了显示器件的显示效果。
具体的,如图2中所示,补偿模块11包括:第一晶体管T1、第二晶体管T2、第三晶体管T3、第一电容C1和第二电容C2,其中:
第一晶体管T1的栅极与扫描信号Scan连接,第一晶体管T1的第一极与数据信号Vdata连接,第一晶体管T1的第二极与控制模块12连接。
第二晶体管T2的栅极与扫描信号Scan连接,第二晶体管T2的第一极与参考信号VREF连接,第二晶体管T2的第二极与第一电容C1的第二端连接。
第一电容C1的第一端与第一晶体管T1的第二极连接。
第二电容C2的第一端与第二晶体管T2的第二极连接,第二电容C2的第二端与第三晶体管T3的第二极连接。
第三晶体管T3的栅极与扫描信号Scan连接,第三晶体管T3的第一极与控制模块12和驱动模块13连接,第三晶体管T3的第二极与驱动模块13连接。
进一步具体的,如图2中所示,控制模块12包括:第四晶体管T4和第六晶体管T6,其中:
第四晶体管T4的栅极与发光控制信号EM连接,第四晶体管T4的第一极与电源信号ELVDD连接,第四晶体管T4的第二极与驱动模块13和补偿模块11连接。
第六晶体管T6的栅极与发光控制信号EM连接,第六晶体管T6的第一极与补偿模块11连接,第六晶体管T6的第二极与驱动模块13和发光模块14连接。
驱动模块13包括:第五晶体管T5,其中:
第五晶体管T5的栅极与补偿模块11连接,第五晶体管T5的第一极与补偿模块11和控制模块12连接,第五晶体管T5的第二极与控制模块12和发光模块14连接。
发光模块14包括:有机发光二极管OLED,其中:
有机发光二极管OLED的输入端与控制模块12和驱动模块13连接,有机发光二极管OLED的输出端接地VSS。
其中,如图2中所示,第一晶体管的第二极可以与第六晶体管的第一极连接;第三晶体管的第一极可以与第四晶体管的第二极连接;第五晶体管的第一极可以与第四晶体管的第二极连接,第五晶体管的第二极与有机发光二极管的输入端连接;第六晶体管的第二极可以与第五晶体管的第二极连接。
具体的,补偿模块11中的第一晶体管T1、第二晶体管T2和第三晶体管T3属于同一类型的晶体管。其中,T1、T2和T3可以同为N型的晶体管或者同为P型的晶体管。
控制模块12中的第四晶体管T4和第六晶体管T6属于同一类型的晶体管;其中,T4和T6可以同为N型晶体管或者同为P型晶体管。
第五晶体管T5为N型晶体管。
本发明所有实施例中采用的晶体管可以为薄膜晶体管或场效应管或其他特性相同的器件,由于这里采用的晶体管的源极、漏极是对称的,所以其源极、漏极是可以互换的。在本发明实施例中,为区分晶体管除栅极之外的两极,将其中一极称为源极,另一极称为漏极。此外本发明实施例所采用的晶体管包括P型晶体管和N型晶体管两种。
下面以晶体管第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4、第五晶体管T5和第六晶体管T6都为N型的晶体管,第五晶体管T5为驱动晶体管;如图2中所示,为方便理解将第一电容C1第一端定义为节点a,第一电容C1第二端和第二电容C2的第一端定义为节点E,第二电容C2的第二端定义为节点b,有机发光二极管输入端定义为节点c;此时,像素驱动电路的工作时序图如图3中所示;该像素驱动电路的工作过程可以包括三个阶段:重置阶段、补偿阶段和发光阶段,以下对该像素驱动电路的各个工作阶段进行详细的说明;
第一阶段即重置阶段,如图3中所示,扫描信号Scan和发光控制信号EM均为高电平,本发明中的像素驱动的电路在重置阶段的等效电路图如图2中所示,第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4、驱动晶体管T5和第六晶体管T6均导通;此时,第一电容C1第一端的电压即节点a的电压为数据信号的电压Vdata,第一电容C1第二端和第二电容C2第一端的电压即节点E的电压为参考信号的电压VREF,第二电容C2第二端的电压即节点b的电压为电源信号电压ELVDD,因此第一电容C1和第二电容C2两端的电压和驱动晶体管T5的栅极电压实现了重置,使得下一周期的工作过程不受上一周期的工作过程中产生的电压信号的影响,避免出现残像的问题。
第二阶段即补偿阶段,如图3中所示,扫描信号Scan为高电平,发光控制信号EM为低电平,本发明中的像素驱动的电路在补偿阶段的等效电路图如图4中所示,第一晶体管T1、第二晶体管T2、第三晶体管T3和驱动晶体管T5均导通;第四晶体管T4和第六晶体管T6均关闭;此时,由于第三晶体管T3导通,因此驱动晶体管T5相当于PN结,因为节点c的电压为Voled0,此时节点b的电压变为Voled0+Vth;其中,Voled0为有机发光二极管的初始电压,Vth为驱动晶体管的阈值电压。因此,在补偿阶段结束时,第一电容C1第一端的电压即节点a的电压为Vdata,第一电容C1第二端和第二电容C2第一端的电压即节点E的电压为VREF,第二电容C2第二端的电压即节点b的电压为Voled0+Vth;此时,第一电容C1两端的电压差值为Vdata-VREF,第二电容C2两端的电压差值为VREF-Voled0-Vth。
第三阶段即发光阶段,如图3中所示,扫描信号Scan为低电平,发光控制信号EM为高电平,本发明中的像素驱动的电路在发光阶段的等效电路图如图5中所示,第一晶体管T1、第二晶体管T2和第三晶体管T3均关闭;第四晶体管T4、驱动晶体管T5和第六晶体管T6均导通;此时,驱动晶体管T5驱动有机发光二极管OLED发光,节点c的电压为Voled1;其中,Voled1为有机发光二极管的工作电压;因而,节点a的电压变为Voled1。由于第一电容C1和第二电容C2的自举效应的存在,第一电容C1和第二电容C2两端的电压差值保持不变,同时在补偿阶段第一电容C1两端的电压差值为Vdata-VREF,因此节点E的电压为Voled1+VREF-Vdata;而在补偿阶段第二电容C2两端的电压差值为VREF-Voled0-Vth,因此节点b的电压为Voled1+Voled0+Vth-Vdata;最终,驱动晶体管T5上的过驱动电压为Voled1+Voled0+Vth-Vdata-Voled1-Vth;因此,节流驱动晶体管T5的电流为:
I = 1 2 μ n × Cox × W L × [ Voled 0 + Vth + Voled 1 - Vdata - Voled 1 - Vth ] 2 = 1 2 μ n × Cox × W L × [ Voled 0 - Vdata ] 2
如此,可以很明显的得到,经过发光阶段之后流经驱动晶体管T5的电流值只与有机发光二极管的初始电压和数据信号的电压有关系,而与驱动晶体管的阈值电压和有机发光二极管的工作电压没有关系;因此,消除了阈值电压对流经有机发光二极管的电流的影响。同时,可以避免因为有机发光二极管的非均匀性引起OLED的工作电压Voled1的不稳定对电流的影响,避免了电流差异的问题。进一步,如图6中所示,其横轴表示有机发光二极管OLED的使用时间,其纵轴表示有机发光二极管的初始电压值Voled0的大小;有机发光二极管的初始电压Voled0随着OLERD使用时间逐渐变大,因此,本发明中的像素驱动的电路可以随着OLED的老化,流经发光二极管OLED的电流逐渐增大,可以很好的解决OLED的老化造成的显示器件亮度衰减的问题,进而在保证电流稳定的情况下可以增加有机发光二极管OLED的使用寿命。
需要说明的是,为了进一步增大有机发光二极管的电流,提高显示器件的显示亮度,本发明中优选的可以采用能够提供负值的数据信号。当然,本发明实施例中只是以第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4、第五晶体管T5和第六晶体管T6都为N型晶体管为例进行说明,并没有限定上述晶体管只能是N型晶体管,在实际的应用中可以根据具体的需要选择满足具体原理的晶体管;若第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4、第五晶体管T5和第六晶体管T6均为P型晶体管,则像素驱动电路的工作时序图与图3中所示的时序图正好相反。其它情况可以根据具体的需求进行设计。
本发明的实施例提供的像素驱动电路,通过补偿模块在扫描信号的控制下接收数据信号和参考信号,控制模块在发光控制信号的控制下接收电源信号,实现控制模块控制补偿模块对驱动晶体管的阈值电压进行补偿,解决了驱动晶体管阈值电压的不稳定性造成的电流差异的问题,避免出现显示器件亮度不均匀的问题,增强了显示器件的显示效果。
本发明的实施例提供一种阵列基板,包括上述实施例中的像素驱动电路。其中,像素驱动电路部分同上述实施例,在此不再赘述。另外,阵列基板其他部分的结构可以参考现有技术,对此本文不再详细描述。
本发明的实施例提供的阵列基板,通过在阵列基板的像素驱动电路中补偿模块在扫描信号的控制下接收数据信号和参考信号,控制模块在发光控制信号的控制下接收电源信号,实现控制模块控制补偿模块对驱动晶体管的阈值电压进行补偿,解决了驱动晶体管阈值电压的不稳定性造成的电流差异的问题,避免出现显示器件亮度不均匀的问题,增强了显示器件的显示效果。
本发明的实施例提供一种显示装置,包括上述实施例中的阵列基板。其中,阵列基板部分同上述实施例,在此不再赘述。另外,显示装置其他部分的结构可以参考现有技术,对此本文不再详细描述。该显示装置可以为电脑显示器、电视显示屏、数码相框、手机、平板电脑等具有显示功能的产品或者部件,本发明实施例中不做具体的限制。
本发明的实施例提供的显示装置,通过在显示装置的像素驱动电路中补偿模块在扫描信号的控制下接收数据信号和参考信号,控制模块在发光控制信号的控制下接收电源信号,实现控制模块控制补偿模块对驱动晶体管的阈值电压进行补偿,解决了驱动晶体管阈值电压的不稳定性造成的电流差异的问题,避免出现显示器件亮度不均匀的问题,增强了显示器件的显示效果。
本领域普通技术人员可以理解:实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成,前述的程序可以存储于一计算机可读取存储介质中,该程序在执行时,执行包括上述方法实施例的步骤;而前述的存储介质包括:ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述,仅为本发明的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,可轻易想到变化或替换,都应涵盖在本发明的保护范围之内。因此,本发明的保护范围应以所述权利要求的保护范围为准。

Claims (10)

1.一种像素驱动电路,其特征在于,所述像素驱动电路包括:补偿模块、控制模块、驱动模块、发光模块,其中:
所述补偿模块连接有扫描信号、数据信号和参考信号,所述补偿模块还与所述控制模块和所述驱动模块连接;
所述控制模块连接有发光控制信号和电源信号,所述控制模块还与所述驱动模块和所述发光模块连接;
所述发光模块的一端与所述驱动模块连接,所述发光模块的另一端接地;
所述补偿模块,用于在所述扫描信号的控制下接收所述数据信号和参考信号,在所述控制模块的控制下补偿所述驱动模块的阈值电压;
所述控制模块,用于在所述发光控制信号的控制下接收所述电源信号,控制所述补偿模块对所述驱动模块的阈值电压进行补偿;
所述驱动模块,用于在所述控制模块的控制下驱动所述发光模块发光。
2.根据权利要求1所述的像素驱动电路,其特征在于,所述补偿模块包括:
第一晶体管,所述第一晶体管的栅极与扫描信号连接,所述第一晶体管的第一极与数据信号连接,所述第一晶体管的第二极与所述控制模块连接;
第二晶体管,所述第二晶体管的栅极与扫描信号连接,所述第二晶体管的第一极与参考信号连接,所述第二晶体管的第二极与第一电容的第二端连接;
第一电容,所述第一电容的第一端与所述第一晶体管的第二极连接;
第二电容,所述第二电容的第一端与所述第二晶体管的第二极连接,所述第二电容的第二端与第三晶体管的第二极连接;
第三晶体管,所述第三晶体管的栅极与所述扫描信号连接,所述第三晶体管的第一极与所述控制模块和所述驱动模块连接,所述第三晶体管的第二极与所述驱动模块连接。
3.根据权利要求1所述的像素驱动电路,其特征在于,所述控制模块包括:
第四晶体管,所述第四晶体管的栅极与所述发光控制信号连接,所述第四晶体管的第一极与所述电源信号连接,所述第四晶体管的第二极与所述驱动模块和所述补偿模块连接;
第六晶体管,所述第六晶体管的栅极与所述发光控制信号连接,所述第六晶体管的第一极与所述补偿模块连接,所述第六晶体管的第二极与所述驱动模块和所述发光模块连接。
4.根据权利要求1所述的像素驱动电路,其特征在于,所述驱动模块包括:第五晶体管,其中:
所述第五晶体管的栅极与所述补偿模块连接,所述第五晶体管的第一极与所述补偿模块和所述控制模块连接,所述第五晶体管的第二极与所述控制模块和所述发光模块连接。
5.根据权利要求1所述的像素驱动电路,其特征在于,所述发光模块包括:有机发光二极管,其中:
所述有机发光二极管的输入端与所述控制模块和所述驱动模块连接,所述有机发光二极管的输出端接地。
6.根据权利要求2所述的像素驱动电路,其特征在于,所述第一晶体管、所述第二晶体管和所述第三晶体管同为N型晶体管或者同为P型晶体管。
7.根据权利要求3所述的像素驱动电路,其特征在于,所述第四晶体管和所述第六晶体管同为N型晶体管或者同为P型晶体管。
8.根据权利要求4所述的像素驱动电路,其特征在于,所述第五晶体管为N型晶体管。
9.一种阵列基板,其特征在于,所述阵列基板包括权利要求1~8任一所述的像素驱动电路。
10.一种显示装置,其特征在于,所述显示装置包括权利要求9所述的阵列基板。
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