CN105139804B - 一种像素驱动电路、显示面板及其驱动方法和显示装置 - Google Patents
一种像素驱动电路、显示面板及其驱动方法和显示装置 Download PDFInfo
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- CN105139804B CN105139804B CN201510628000.0A CN201510628000A CN105139804B CN 105139804 B CN105139804 B CN 105139804B CN 201510628000 A CN201510628000 A CN 201510628000A CN 105139804 B CN105139804 B CN 105139804B
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Abstract
本发明实施例提供一种像素驱动电路、显示面板及其驱动方法和显示装置,涉及显示技术领域,避免触控驱动信号的电压随时间变化对显示效果的影响。该像素驱动电路,包括:预置单元、驱动单元,补偿单元、储能单元和驱动信号输出单元。本发明实施例用于显示器制造。
Description
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、显示面板及其驱动方法和显示装置。
背景技术
相对于现有的显示装置而言,有机发光二极管(Organic Light Emitting Diode,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显示装置按照驱动方式的不同可分为PMOLED(Passive Matrix Driving OLED,无源矩阵驱动有机发光二极管)和AMOLED(Active Matrix Driving OLED,有源矩阵驱动有机发光二极管)两种,由于AMOLED显示器具有低制造成本、高应答速度、省电、可用于便携式设备的直流驱动、工作温度范围大等等优点而可望成为取代LCD(liquid crystal display,液晶显示器)的下一代新型平面显示器。
目前OLED是通过一个驱动晶体管(英文:Drive Thin Film Transistor,简称:DTFT)进行驱动,DTFT通常是P型的开关管。DTFT的栅极连接数据输入端Vdata,源极连接恒压的电源输入端VDD,漏极连接OLED。由源极的VDD与栅极的Vdata之间产生电压差VGS,从而使得DTFT漏极的OLED导通,OLED的驱动电流IOLED=K(VGS-Vth)2,其中Vth为DTFT本身的阈值电压,K为常数。由上述驱动电流公式可以看出,DTFT的阈值电压Vth会对流过OLED的驱动电流IOLED会产生影响,而由于制造工艺的误差、器件老化等原因,会使各个像素单元中DTFT的阈值电压Vth产生漂移,对流过OLED的驱动电流造成偏差,进而影响显示效果。另一方面,随着显示技术的急速进步,具有触控功能的显示装置由于其所具有的可视化操作等优点而逐渐得到越来越多人们的欢迎。现有的一种OLED显示装置中,将OLED显示装置中OLED的阴极复用为触控电极使用,这样可以降低显示装置的整体厚度。在将阴极复用为触控电极时,需要在阴极上施加触控驱动信号,由于触控驱动信号的电压随时间变化,会导致流经OLED的电流发生变化,使得OLED的发光亮度随时间变化,影响发光显示。
发明内容
本发明的实施例提供一种像素驱动电路、显示面板及其驱动方法和显示装置,能够避免驱动晶体管的阈值电压漂移对有源发光器件驱动电流的影响,同时避免触控驱动信号的电压随时间变化对显示效果的影响。
为达到上述目的,本发明的实施例采用如下技术方案:
一方面,提供一种像素驱动电路,包括:预置单元、驱动单元,补偿单元、储能单元和驱动信号输出单元;
所述储能单元连接第一节点和第二节点,用于存储所述第一节点和所述第二节点的电压;
所述预置单元连接第一电压端、第一节点、第二节点、第二扫描信号端和重置信号端,用于在所述第二扫描信号端的控制下将所述第一电压端的电压写入所述第一节点,并将所述重置信号端的电压写入所述第二节点;
所述补偿单元连接第三节点、第一节点、第二节点、数据信号端和第一扫描信号端,用于在所述第一扫描信号端的控制下将所述数据信号端的数据电压写入所述第一节点,并将所述第三节点的电压写入所述第二节点,直至将所述第二节点的电压补偿为第一电压端的电压与所述驱动单元的阈值电压之差;
所述驱动单元连接第一电压端、第二节点和第三节点,用于在所述第一电压端的电压与所述第二节点的电压控制下向所述第三节点输出用于驱动所述像素驱动电路所连接的电致发光元件的驱动电流;
所述驱动信号输出单元连接所述第一节点、第三节点、参考信号端、第三扫描信号端和信号输出端,用于在所述第三扫描信号端的控制下将所述参考信号端的信号写入所述第一节点,并将所述第三节点的驱动电流输出至所述信号输出端。
可选的,所述预置单元包括:第一晶体管和第四晶体管;
所述第一晶体管的栅极连接所述第二扫描信号端、所述第一晶体管的第一端连接所述第一电压端、所述第一晶体管的第二端连接所述第一节点;
所述第四晶体管的栅极连接所述第二扫描信号端,所述第四晶体管的第一端连接所述重置信号端,所述第四晶体管的第二端连接所述第二节点。
可选的,所述储能单元包括:第一电容;
所述第一电容的第一端连接所述第一节点,所述第一电容的第二端连接所述第二节点。
可选的,所述驱动单元包括:驱动晶体管;
所述驱动晶体管的栅极连接所述第二节点,所述驱动晶体管的第一端连接所述第一电压端;所述驱动晶体管的第二端连接所述第三节点。
可选的,所述补偿单元包括:第三晶体管和第五晶体管;
所述第三晶体管的栅极连接所述第一扫描信号端,所述第三晶体管的第一端连接所述数据信号端,所述第三晶体管的第二端连接所述第一节点;
所述第五晶体管的栅极连接所述第一扫描信号端,所述第五晶体管的第一端连接所述第三节点,所述第五晶体管的第二端连接所述第二节点。
可选的,所述驱动信号输出单元包括:第二晶体管和第六晶体管;
所述第二晶体管的栅极连接所述第三扫描信号端,所述第二晶体管的第一端连接所述参考信号端,所述第二晶体管的第二端连接所述第一节点;
所述第六晶体管的栅极连接所述第三扫描信号端,所述第六晶体管的第一端连接所述第三节点,所述第六晶体管的第二端连接所述信号输出端。
一方面,提供一种显示面板,包括基底、形成在所述基底上的电致发光元件阵列、用以驱动各个电致发光元件的像素驱动电路阵列以及用于向所述像素驱动电路阵列提供显示驱动信号的多条显示驱动信号线;
所述像素驱动电路阵列中的像素驱动电路为如上述任一素驱动电路;所述电致发光元件阵列包括第一电极图形、第二电极图形和设置在所述第一电极图形和所述第二电极图形之间的电致发光层;所述第一电极图形包括多个第一电极,其中的每一个第一电极对应连接一个像素驱动电路的信号输出端。
可选的,所述显示面板还包括多条触控信号线,所述第二电极图形包括多个第二电极,每一个第二电极连接到一条触控信号线,适于作为一个触控电极。
可选的,所述第二电极图形中的各个第二电极分为多行,奇数行的第二电极与偶数行的第二电极在列方向上交错;每一个的奇数行的各个第二电极连接到同一触控信号线;偶数行的各个第二电极中位于同一列的各个第二电极连接同一条触控信号线。
一方面,提供一种如上述的显示面板的驱动方法,
第一阶段,预置单元在第二扫描信号端的控制下将第一电压端的电压写入所述第一节点,并将重置信号端的电压写入所述第二节点;
第二阶段,补偿单元在所述第一扫描信号端的控制下将数据信号端的数据电压写入第一节点,并将第三节点的电压写入第二节点,直至将第二节点的电压补偿为第一电压端的电压与驱动单元的阈值电压之差;
第三阶段,驱动信号输出单元在所述第三扫描信号端的控制下将参考信号端的信号写入第一节点,驱动单元在第一电压端的电压与所述第二节点的电压控制下向第三节点输出用于驱动像素驱动电路所连接的电致发光元件的驱动电流;驱动信号输出单元将第三节点的驱动电流输出至信号输出端;
所述第三阶段包括触控时段,在所述第二电极图形中的第二电极上施加触控驱动信号;其中,在各条显示驱动信号线施加的显示驱动信号的电压与在触控信号线施加的触控驱动信号的电压的差值不随时间变化。
可选的,所述预置单元包括:第一晶体管和第四晶体管;
第一阶段,第一晶体管和第四晶体管在第二扫描信号端的控制下均为导通状态,将第一电压端的电压通过所述第一晶体管写入所述第一节点,并将重置信号端的电压通过所述第四晶体管写入所述第二节点;
可选的,所述补偿单元包括:第三晶体管和第五晶体管;
第二阶段,第三晶体管和第五晶体管在所述第一扫描信号端的控制下均处于导通状态,将数据信号端的数据电压通过所述第三晶体管写入第一节点,并将第三节点的电压通过所述第五晶体管写入第二节点,直至将第二节点的电压补偿为第一电压端的电压与驱动单元的阈值电压之差;
可选的,所述驱动信号输出单元包括:第二晶体管和第六晶体管;
第三阶段,第二晶体管和第六晶体管在所述第三扫描信号端的控制线均处于导通状态,将参考信号端的信号通过所述第二晶体管写入第一节点,将第三节点的驱动电流通过所述第六晶体管输出至信号输出端。
一方面,一种显示装置,包括上述的显示面板。
本发明的实施例提供像素驱动电路、显示面板及其驱动方法和显示装置,由于补偿单元能够对驱动单元进行阈值电压补偿,避免了像素驱动电路中驱动单元的阈值电压漂移对驱动电流电流造成的影响,同时在触控时段在第二电极图形中的第二电极上施加触控驱动信号;并且在对包含上述的像素驱动电路的显示面板进行驱动时,在各条显示驱动信号线施加的显示驱动信号的电压与在触控驱动信号的电压的差值不随时间变化,因此避免触控驱动信号的电压随时间变化对显示效果的影响。
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为本发明实施例提供的一种像素驱动电路结构示意图;
图2为本发明实施例提供的一种显示面板的结构示意图;
图3为本发明实施例提供的一种如图2所示的显示面板中第二电极与触控信号线的连接关系示意图;
图4为本发明实施例提供的像素驱动电路结构示意图;
图5为本发明实施例提供的如图4所示的像素驱动电路的输入信号的时序图;
图6为本发明实施例提供的如图4所示的像素驱动电路在t1阶段的等效电路示意图;
图7为本发明实施例提供的如图4所示的像素驱动电路在t2阶段的等效电路示意图;
图8为本发明实施例提供的如图4所示的像素驱动电路在t3阶段的等效电路示意图;
附图标记:
基底-10,缓冲层-11,有源层-12;掺杂的有源层-12a(12b),栅绝缘层-13,栅极-14,层间绝缘层-15,漏极-16a,源极-16b,触控信号线-16c,平坦化层-17,第一电极-18a,第三电极-18b,像素限定层-19,电致发光层-20,第二电极-21,像素驱动电路-30;
预置单元-101,驱动单元-102,补偿单元-103,储能单元-104,驱动信号输出单元-105;
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,第六晶体管-T6,驱动晶体管-DTFT,电容-C,电致发光元件-OLED。
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。
本发明所有实施例中采用的晶体管均可以为薄膜晶体管或场效应管或其他特性相同的器件,根据在电路中的作用本发明的实施例所采用的晶体管主要为开关晶体管。由于这里采用的开关晶体管的源极、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,将其中源极称为第一端,漏极称为第二端。按附图中的形态规定晶体管的中间端为栅极、信号输入端为源极、信号输出端为漏极。此外本发明实施例所采用的开关晶体管包括P型开关晶体管和N型开关晶体管两种,其中,P型开关晶体管在栅极为低电平时导通,在栅极为高电平时截止,N型开关晶体管为在栅极为高电平时导通,在栅极为低电平时截止;驱动晶体管包括P型和N型,其中P型驱动晶体管在栅极电压为低电平(栅极电压小于源极电压),且栅极源极的压差的绝对值大于阈值电压时处于放大状态或饱和状态;其中N型驱动晶体管的栅极电压为高电平(栅极电压大于源极电压),且栅极源极的压差的绝对值大于阈值电压时处于放大状态或饱和状态。
本发明的实施例提供一种像素驱动电路,参照图1所示,包括:预置单元101、驱动单元102、补偿单元103、储能单元104和驱动信号输出单元105;
所储能单元104连接第一节点a和第二节点b,用于存储第一节点a和第二节点b的电压;
所预置单元101连接第一电压端V1、第一节点a、第二节点b、第二扫描信号端S2和重置信号端INT,用于在第二扫描信号端S2的控制下将第一电压端V1的电压写入第一节点a,并将重置信号端INT的电压写入第二节点b;
补偿单元103连接第三节点c、第一节点a、第二节点b、数据信号端Data和第一扫描信号端S1,用于在第一扫描信号端S1的控制下将数据信号端Data的数据电压写入所述第一节点a,并将第三节点c的电压写入所述第二节点b,直至将第二节点b的电压补偿为第一电压端V1的电压与驱动单元12的阈值电压之差;
驱动单元102连接第一电压端V1、第二节点b和第三节点c,用于在第一电压端V1的电压与所述第二节点b的电压控制下向第三节点c输出用于驱动所述像素驱动电路所连接的电致发光元件的驱动电流;
驱动信号输出单元105连接第一节点a、第三节点c、参考信号端REF、第三扫描信号端S3和信号输出端OUT,用于在第三扫描信号端S3的控制下将参考信号端REF的信号写入第一节点a,并将第三节点c的驱动电流输出至信号输出端OUT。
本发明的实施例提供一种显示面板,包括基底、形成在基底上的电致发光元件阵列、用以驱动各个电致发光元件的像素驱动电路阵列以及用于向像素驱动电路阵列提供显示驱动信号的多条显示驱动信号线;
像素驱动电路阵列中的像素驱动电路为如上述像素驱动电路;电致发光元件阵列包括第一电极图形、第二电极图形和设置在第一电极图形和第二电极图形之间的电致发光层;第一电极图形包括多个第一电极,其中的每一个第一电极对应连接一个像素驱动电路的信号输出端;
显示面板还包括多条触控信号线,第二电极图形包括多个第二电极,每一个第二电极连接到一条触控信号线,适于作为一个触控电极。
可选的,第二电极图形中的各个第二电极分为多行,奇数行的第二电极与偶数行的第二电极在列方向上交错;每一个的奇数行的各个第二电极连接到同一触控信号线;偶数行的各个第二电极中位于同一列的各个第二电极连接同一条触控信号线。
本发明的实施例还提供一种如上述的显示面板的驱动方法,包括如下三个阶段:
第一阶段,预置单元在第二扫描信号端的控制下将第一电压端的电压写入第一节点,并将重置信号端的电压写入第二节点;
第二阶段,补偿单元在第一扫描信号端的控制下将数据信号端的数据电压写入第一节点,并将第三节点的电压写入第二节点,直至将第二节点的电压补偿为第一电压端的电压与驱动单元的阈值电压之差;
第三阶段,驱动信号输出单元在第三扫描信号端的控制下将参考信号端的信号写入第一节点,驱动单元在第一电压端的电压与第二节点的电压控制下向第三节点输出用于驱动像素驱动电路所连接的电致发光元件的驱动电流;驱动信号输出单元将第三节点的驱动电流输出至信号输出端;
第三阶段包括触控时段,在第二电极图形中的第二电极上施加触控驱动信号;其中,在各条显示驱动信号线施加的显示驱动信号的电压与在触控信号线施加的触控驱动信号的电压的差值不随时间变化。
对这样的显示面板进行驱动时,上述的第三阶段驱动电致发光元件发光,该第三阶段包括触控时段,此时该方法中,在第三阶段中的触控时段,在各条显示驱动信号线分别对应连接像素驱动电路的各个信号端,在各条显示驱动信号线施加对应的显示驱动信号的电压与在触控信号线施加的触控驱动信号线施加的触控驱动信号的电压的差值为恒定值。
这样能够降低因第二电极与各条显示驱动信号线之间的电容造成的触控驱动信号在第二电极上的传输时对各条显示驱动信号线上电压的影响。具体来说,可以在该触控时段,使在每一条显示驱动信号线上施加的显示驱动信号具有一定的电压波动,该电压波动与施加在第二电极上的触控驱动信号的电压变化同步,且波动电压的幅值与触控驱动信号的电压变化相同,这样就使得显示驱动信号的电压与触控驱动信号的电压的差值为恒定值,从而避免第二电极与各条显示驱动信号线的电容变化,保证了第三阶段像素驱动电路向电致发光元件输出恒定的驱动电流。
这样,由于补偿单元能够对驱动单元进行阈值电压补偿,避免了像素驱动电路中驱动单元的阈值电压漂移对驱动电流电流造成的影响,同时在触控时段在第二电极图形中的第二电极上施加触控驱动信号;并且在对包含上述的像素驱动电路的显示面板进行驱动时,在各条显示驱动信号线施加的显示驱动信号的电压与在触控驱动信号的电压的差值不随时间变化,因此避免触控驱动信号的电压随时间变化对显示效果的影响。
在具体实施时,上述的显示面板的具体结构可以由多种,比如其中的像素驱动电路可能表现为多种不同的形式,具体的驱动方法也不尽相同。下面结合附图进行举例说明。
在具体实施时,显示面板上的电致发光单元阵列包括多个电致发光元件、相应的该电致发光单元阵列的第一电极图形会包含相应数量个第一电极,每一个电致发光元件的第一电极对应连接一个像素驱动电路,在像素驱动电路的驱动下进行发光显示,一个电致发光元件和一个像素驱动电路构成一个像素单位;另外在显示面板上还会形成有用于控制各个像素驱动电路的多条显示驱动信号线。不难理解的是,由于触控精度的要求低于像素的分辨率,作为触控电极的第二电极图形中的各个第二电极的大小不必与一个像素单位相适应,也就是说,多个像素单位可以共用一个第二电极。参见图2,为本发明提供的显示面板在一个像素单位处的结构示意图,包括:基底10、形成在基底10上的第一电极18a、第二电极21以及在第一电极18a和第二电极21之间的电致发光层20。第一电极18a与其上方的第二电极21、电致发光层20共同实现电致发光。还包括与第一电极18a相连的像素驱动电路30,其中图2中仅示出像素驱动电路中的一个晶体管(与电致发光器件相连的晶体管)的结构,当然可以理解的像素驱动电路的其他器件均可以采用现有的构图工艺制作于基底10之上,其中该晶体管为一顶栅型晶体管包括有源层12,掺杂的有源层12a、12b,栅绝缘层13,栅极14,层间绝缘层15,漏极16a,源极16b;其中图2中还示出了,缓冲层11、与第二电极21相连的触控信号线16c,平台化层17,像素限定层19,平坦化层17上还设置有通过过孔与触控信号线16c相连的第三电极18b,其中第一电极18a通过平坦化层17上的过孔与漏极16a连接,第二电极21通过像素限定层19的过孔与第三电极18b相连,上述各个结构中,第一电极18a和第三电极18b同层形成,漏极16a、源极16b和触控信号线16c同层形成。参见图3,为第二电极图形中的各个第二电极21与触控信号线16c的连接关系图,奇数行的第二电极21和偶数行的第二电极21的位置交错,每一个奇数行内的各个第二电极21连接到在同一行方向上的触控信号线16c上,而各个偶数行的第二电极21中的每一列第二电极21连接到同一在列方向上的触控信号线16c上。在具体应用时,当手指触摸到任一个位置,会导致邻近该位置的各个第二电极21(包括连接到列方向上的触控信号线16c上的第二电极21和连接到行方向上的触控信号线16c上的第二电极21)上存储的电荷发生变化,这样的变化可以被连接这些第二电极21的触控信号线16c检测到,进而确定触控位置。
一般的,这里的第一电极18a为电致发光元件的阳极,第二电极21为电致发光元件的阴极。本发明实施例中,通过复用电致发光元件阵列的阴极作为触控电极,能够避免单独的制作触控电极,利于降低显示装置的盒厚。
在具体实施时,这里的触控信号线可以在制作像素驱动电路中的各个元件(比如电容、晶体管等)时同时制作。进一步的,在一些情况下,上述的像素驱动电路和第一电极图形以及电致发光层可以制作在背板上,而第二电极图形则可以制作在盖板上,此时可以将触控信号线制作在背板上。
参考图4,在具体实施时,构成上述像素驱动电路30的各个单元的具体结构描述如下:像素驱动电路30包括T1-T6共6个P型开关晶体管以及一个P型驱动晶体管DTFT和一个电容C,该像素驱动电路30与电致发光元件OLED的阳极相连。对上述的显示面板包括:向各个信号端提供信号的信号线。
预置单元101包括:第一晶体管T1和第四晶体管T4;
第一晶体管T1的栅极连接第二扫描信号端S2、第一晶体管T1的第一端连接第一电压端V1、第一晶体管T1的第二端连接第一节点a;第四晶体管T4的栅极连接第二扫描信号端S2,第四晶体管T4的第一端连接INT,第四晶体管T4的第二端连接第二节点b。
储能单元104包括:第一电容C;
第一电容C的第一端连接第一节点a,第一电容C的第二端连接第二节点b。
驱动单元12包括:驱动晶体管DTFT;
驱动晶体管DTFT的栅极连接第二节点b,驱动晶体管DTFT的第一端连接第一电压端V1;驱动晶体管DTFT的第二端连接第三节点c。
补偿单元103包括:第三晶体管T3和第五晶体管T5;
第三晶体管T3的栅极连接第一扫描信号端S1,第三晶体管T3的第一端连接数据信号端Data,第三晶体管T3的第二端连接第一节点a;第五晶体管T5的栅极连接第一扫描信号端S1,第五晶体管T5的第一端连接第三节点c,第五晶体管T5的第二端连接第二节点b。
驱动信号输出单元105包括:第二晶体管T2和第六晶体管T6;
第二晶体管T2的栅极连接第三扫描信号端S3,第二晶体管T2的第一端连接参考信号端REF,第二晶体管T2的第二端连接第一节点a;第六晶体管T6的栅极连接第三扫描信号端S3,第六晶体管T6的第一端连接第三节点c,第六晶体管T6的第二端连接信号输出端OUT。
其中,上述显示面板中的像素电路包括以上具体器件结构时,上述显示面板的驱动方法还包括以下方式:
可选的,预置单元包括:第一晶体管和第四晶体管;
第一阶段,第一晶体管和第四晶体管在第二扫描信号端的控制下均为导通状态,将第一电压端的电压通过第一晶体管写入第一节点,并将重置信号端的电压通过第四晶体管写入第二节点;
可选的,补偿单元包括:第三晶体管和第五晶体管;
第二阶段,第三晶体管和第五晶体管在第一扫描信号端的控制下均处于导通状态,将数据信号端的数据电压通过第三晶体管写入第一节点,并将第三节点的电压通过第五晶体管写入第二节点,直至将第二节点的电压补偿为第一电压端的电压与驱动单元的阈值电压之差;
可选的,驱动信号输出单元包括:第二晶体管和第六晶体管;
第三阶段,第二晶体管和第六晶体管在第三扫描信号端的控制线均处于导通状态,将参考信号端的信号通过第二晶体管写入第一节点,将第三节点的驱动电流通过第六晶体管输出至信号输出端。
本发明实施例所提供的显示面板中的像素驱动电路通过合适的驱动方法能够避免驱动晶体管的阈值漂移对发光显示造成的影响并能避免施加在阴极上的触控驱动信号对发光显示的影响,下面结合图5-8对图4中的像素驱动电路的工作原理进行说明。
这里以各个晶体管均为“P”型晶体管为例进行说明,V1端为高电平VDD信号,信号输出端OUT连接至电致发光器件(以OLED为例)的阳极,电致发光器件的阴极连接的V2端为低电平VSS。参照图4提供的像素驱动电路,图5提供的像素驱动电路的输入信号时序状态示意图,同时参照图6~8所提供的像素驱动电路的各个阶段工作状态的等效电路示意图,则显示面板的工作原理分成四个部分,分别是第一阶段t1的预置阶段,第二阶段t2的阈值电压和数据写入阶段,第三阶段t3是发光阶段,其中t3阶段中包含δt触控时段。其中以下实施例中具体结合图6~8所示的等效电路图说明,各个附图中采用实线表示导通的晶体管及线路,虚线表示未导通的晶体管及线路。
第一阶段t1,S1=1,S2=0,S3=1,需要说明的是,以下实施例中,“0”表示低电平;“1”表示高电平。参照图6所示的等效电路图,S1、S3为高压截止信号,S2为低压导通信号状态。此时T1、T4导通,节点b通过重置信号端INT将电压重置为Vint,节点a电压重置为VDD,之后电容C保持节点a和节点b的电压差,由于Vint为低电平使得DTFT导通,并且由于电容C能保持节点a和节点b的电压差使得下一个阶段一开始DTFT就处于导通状态,为进行阈值补偿做准备。
第二阶段t2,S1=0,S2=1,S3=1。参照图7所示的等效电路图,S2、S3为高压截止信号,S1为低压导通信号状态。此时T3、T5导通,数据信号端Data通过T3对节点a充电,直至节点a的电压变化为Vdata,由于T5导通,DTFT的栅极和漏极短接相当于二极管,而b点电势充电为VDD-Vth(满足DTTF栅源之间的压差为Vth),此时电容C两端的电势差为VDD-Vth-Vdata,并为下一阶段作准备。
第三阶段t3,S1=1,S2=1,S3=0。参照图8所示的等效电路图,S1、S2为高压截止信号,S3为低压导通信号状态。此时T2、T6导通,参考信号端REF对节点a充电值Vref,节点b发生电压跳变至
VDD-Vth-Vdata+Vref,时序图中t3为像素正式发光阶段,此时的发光阶段DTFT源极的电压为VDD,电流通过DTFT和T6使得OLED开始发光。
由DTFT饱和电流公式可以得到:
IOLED=K(VGS–Vth)2
=K[VDD-[VDD-Vth-Vdata+Vref]–Vth]2
=K(Vdata-Vref)2
由上式中可以看到此时工作电流IOLED已经不受Vth的影响。彻底解决了驱动TFT由于工艺制程及长时间的操作造成阈值电压(Vth)漂移的问题,消除其对IOLED的影响,保证OLED的正常工作。
在第三阶段t3中的δt触控时段,除了阴极电极(第二电极即触控电极)输入触控驱动信号开始驱动以外,其他的显示驱动信号线与触控电极都一起进行驱动,保证原来所有的TFT开关都保持原来的开关状态。同时也不影响OLED输出电流的大小,因为a点在整个发光阶段数据信号已经写入,由于VDD电压及其他显示驱动信号线的电压都随触控电极的触控驱动信号一起跳变,包括Vint电压,a点处于Floating(浮接)状态,也会跟着Vint点进行跳变。因此对末端输出的电流IOLED没有影响。
另外不难理解的是,本实施例中将各个晶体管均设置为P型晶体管可以降低制作难度,但是在实际应用中,上述的各个晶体管的类型可以进行一定的调整,相应的技术方案也能够达到本发明的基本目的,应落入本发明的保护范围。
本发明还提供了一种显示装置,包括上述任一项所述的显示基板。
这里的显示装置可以为:电子纸、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
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 (14)
1.一种像素驱动电路,其特征在于,包括:预置单元、驱动单元,补偿单元、储能单元和驱动信号输出单元;
所述储能单元连接第一节点和第二节点,用于存储所述第一节点和所述第二节点的电压;
所述预置单元连接第一电压端、第一节点、第二节点、第二扫描信号端和重置信号端,用于第一阶段在所述第二扫描信号端的控制下将所述第一电压端的电压写入所述第一节点,并同时将所述重置信号端的电压写入所述第二节点;
所述补偿单元连接第三节点、第一节点、第二节点、数据信号端和第一扫描信号端,用于第二阶段在所述第一扫描信号端的控制下将所述数据信号端的数据电压写入所述第一节点,并将所述第三节点的电压写入所述第二节点,直至将所述第二节点的电压补偿为第一电压端的电压与所述驱动单元的阈值电压之差;
所述驱动单元连接第一电压端、第二节点和第三节点,用于第三阶段在所述第一电压端的电压与所述第二节点的电压控制下向所述第三节点输出用于驱动所述像素驱动电路所连接的电致发光元件的驱动电流;
所述驱动信号输出单元连接所述第一节点、第三节点、参考信号端、第三扫描信号端和信号输出端,用于所述第三阶段在所述第三扫描信号端的控制下将所述参考信号端的信号写入所述第一节点,并同时将所述第三节点的驱动电流输出至所述信号输出端。
2.根据权利要求1所述的像素驱动电路,其特征在于,所述预置单元包括:第一晶体管和第四晶体管;
所述第一晶体管的栅极连接所述第二扫描信号端、所述第一晶体管的第一端连接所述第一电压端、所述第一晶体管的第二端连接所述第一节点;
所述第四晶体管的栅极连接所述第二扫描信号端,所述第四晶体管的第一端连接所述重置信号端,所述第四晶体管的第二端连接所述第二节点。
3.根据权利要求1所述的像素驱动电路,其特征在于,所述储能单元包括:第一电容;
所述第一电容的第一端连接所述第一节点,所述第一电容的第二端连接所述第二节点。
4.根据权利要求1所述的像素驱动电路,其特征在于,所述驱动单元包括:驱动晶体管;
所述驱动晶体管的栅极连接所述第二节点,所述驱动晶体管的第一端连接所述第一电压端;所述驱动晶体管的第二端连接所述第三节点。
5.根据权利要求1所述的像素驱动电路,其特征在于,所述补偿单元包括:第三晶体管和第五晶体管;
所述第三晶体管的栅极连接所述第一扫描信号端,所述第三晶体管的第一端连接所述数据信号端,所述第三晶体管的第二端连接所述第一节点;
所述第五晶体管的栅极连接所述第一扫描信号端,所述第五晶体管的第一端连接所述第三节点,所述第五晶体管的第二端连接所述第二节点。
6.根据权利要求1所述的像素驱动电路,其特征在于,所述驱动信号输出单元包括:第二晶体管和第六晶体管;
所述第二晶体管的栅极连接所述第三扫描信号端,所述第二晶体管的第一端连接所述参考信号端,所述第二晶体管的第二端连接所述第一节点;
所述第六晶体管的栅极连接所述第三扫描信号端,所述第六晶体管的第一端连接所述第三节点,所述第六晶体管的第二端连接所述信号输出端。
7.一种显示面板,其特征在于,包括基底、形成在所述基底上的电致发光元件阵列、用以驱动各个电致发光元件的像素驱动电路阵列以及用于向所述像素驱动电路阵列提供显示驱动信号的多条显示驱动信号线;
所述像素驱动电路阵列中的像素驱动电路为如权利要求1-6任一项所述的像素驱动电路;所述电致发光元件阵列包括第一电极图形、第二电极图形和设置在所述第一电极图形和所述第二电极图形之间的电致发光层;所述第一电极图形包括多个第一电极,其中的每一个第一电极对应连接一个像素驱动电路的信号输出端。
8.根据权利要求7所述的显示面板,体特征在于,所述显示面板还包括多条触控信号线,所述第二电极图形包括多个第二电极,每一个第二电极连接到一条触控信号线,适于作为一个触控电极。
9.根据权利要求8所述的显示面板,其特征在于,所述第二电极图形中的各个第二电极分为多行,奇数行的第二电极与偶数行的第二电极在列方向上交错;每一个的奇数行的各个第二电极连接到同一触控信号线;偶数行的各个第二电极中位于同一列的各个第二电极连接同一条触控信号线。
10.一种如权利要求7-9任一项所述的显示面板的驱动方法,其特征在于,
第一阶段,预置单元在第二扫描信号端的控制下将第一电压端的电压写入第一节点,并将重置信号端的电压写入第二节点;
第二阶段,补偿单元在所述第一扫描信号端的控制下将数据信号端的数据电压写入第一节点,并将第三节点的电压写入第二节点,直至将第二节点的电压补偿为第一电压端的电压与驱动单元的阈值电压之差;
第三阶段,驱动信号输出单元在所述第三扫描信号端的控制下将参考信号端的信号写入第一节点,驱动单元在第一电压端的电压与所述第二节点的电压控制下向第三节点输出用于驱动像素驱动电路所连接的电致发光元件的驱动电流;驱动信号输出单元将第三节点的驱动电流输出至信号输出端;
所述第三阶段包括触控时段,在所述第二电极图形中的第二电极上施加触控驱动信号;其中,在各条显示驱动信号线施加的显示驱动信号的电压与在触控信号线施加的触控驱动信号的电压的差值不随时间变化。
11.根据权利要求10所述的方法,其特征在于,所述预置单元包括:第一晶体管和第四晶体管;
第一阶段,第一晶体管和第四晶体管在第二扫描信号端的控制下均为导通状态,将第一电压端的电压通过所述第一晶体管写入所述第一节点,并将重置信号端的电压通过所述第四晶体管写入所述第二节点。
12.根据权利要求10所述的方法,其特征在于,所述补偿单元包括:第三晶体管和第五晶体管;
第二阶段,第三晶体管和第五晶体管在所述第一扫描信号端的控制下均处于导通状态,将数据信号端的数据电压通过所述第三晶体管写入第一节点,并将第三节点的电压通过所述第五晶体管写入第二节点,直至将第二节点的电压补偿为第一电压端的电压与驱动单元的阈值电压之差。
13.根据权利要求10所述的方法,其特征在于,所述驱动信号输出单元包括:第二晶体管和第六晶体管;
第三阶段,第二晶体管和第六晶体管在所述第三扫描信号端的控制线均处于导通状态,将参考信号端的信号通过所述第二晶体管写入第一节点,将第三节点的驱动电流通过所述第六晶体管输出至信号输出端。
14.一种显示装置,其特征在于,包括如权利要求7-9任一项所述的显示面板。
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