CN111373469B - Oled显示面板及其显示面板发光驱动电路 - Google Patents

Oled显示面板及其显示面板发光驱动电路 Download PDF

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CN111373469B
CN111373469B CN201780096997.7A CN201780096997A CN111373469B CN 111373469 B CN111373469 B CN 111373469B CN 201780096997 A CN201780096997 A CN 201780096997A CN 111373469 B CN111373469 B CN 111373469B
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CN111373469A (zh
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金志河
熊娜娜
陈丹
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Shenzhen Royole Technologies Co Ltd
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Abstract

一种液晶显示板及其EOA模块(10')，EOA模块(10')包括：高电平产生单元(11)，用于生成输出信号，且输出信号在第一组时钟信号(CLK)的有效电平期间为高电平信号；重置单元(12)，用于在当前级的扫描信号(Gn)和第二组时钟信号(CLKB)均为有效电平期间，将输出信号由高电平信号重置为低电平信号；恢复单元(13)，用于在后一级的扫描信号(Gn+1)的有效电平期间，将输出信号由低电平信号恢复至高电平信号。

Description

OLED显示面板及其显示面板发光驱动电路
技术领域
本发明涉及OLED显示领域，尤其涉及一种OLED显示面板及其显示面板发光驱动电路。
背景技术
由于TFT-LCD(Thin FilmTransistor Liquid Crystal Display，薄膜晶体管液晶显示器)具有轻、薄、耗电小等优点，被广泛应用于电视、笔记本电脑、移动电话等设备。
OLED(有机发光二极管)作为一种电流型发光器件，具有自发光、快速响应、宽视角以及制作于柔性衬底等优点被广泛应用于高性能显示领域。但是，受限于制造工艺，OLED像素的各个驱动晶体管常常出现开启电压、迁移率等电学参数的波动，从而导致流经OLED器件的电流会随着驱动晶体管的开启电压、迁移率的波动而有所不同，进而造成OLED像素的亮度不均，影响显示画质。
为了实现更加稳定、高品质和清晰度显示效果，通常对OLED像素单元进行内部补偿。例如，在图1A所示的带内部补偿的OLED像素单元中，在驱动OLED时共有四个阶段：重置(Reset)阶段、补偿(Compensation)阶段、数据输入(Data in)阶段和发光(Emission)阶段。结合图1B，在重置阶段，由于RST信号为高电平，TFT管T4导通，而Vinitial信号为低电平，所以，OLED无电流信号流过；在补偿阶段，TFT管T1、T3导通，但Vref信号为低电平，也无电流信号流过OLED；在数据输入阶段，TFT管T1导通，且Vdata信号为高电平，开始为电容C1充电，依然无电流信号流过OLED；在发光阶段，TFT管T3、T2导通(电容C1充好电)，所以，此时，OLED开始流过电流信号，从而开始发光。在该OLED像素单元中，对于驱动TFT管T3的发光信号En，其由EOA(Emission D-IC On Array，显示面板发光驱动)模块提供，且其仅在数据输入阶段为低电平，在其它阶段均为高电平，即，在数据输入阶段，关掉EOA模块，驱动IC输出的数据信号经TFT管T1进入电容C1，从而完成数据信号的输入。数据信号的作用是控制像素的亮度。另外，对于驱动TFT管T1的扫描信号Gn，其由GOA(Gate D-IC On Array，显示面板扫描驱动)模块提供。
结合图2A、2B所示的现有技术中的一种EOA模块的电路图，该EOA模块由以下两部分组成：高电平产生单元、重置单元。其中，重置单元在起始脉冲信号(STV)及第二时钟信号(GCLK)均为高电平时，其输出端所输出的信号(Rout n)为高电平，而且，下一级输出信号恢复为低电平；高电平产生单元在第一时钟信号(ECLK n)为高电平，且重置单元的输出信号(Rout n)为低电平时，使EOA模块的输出端所输出的信号(EMS-out n，简称En)为高电平。而在重置单元的输出信号(Rout n)为高电平时，将EOA模块的输出端所输出的信号由高电平重置为低电平。从而实现EOA模块仅在数据输入阶段输出低电平信号，而在其它三个阶段输出高电平信号。
但是，在构建上述EOA模块时，由于需要引入STV信号，而该STV信号由驱动IC提供，这样，一方面，增加了驱动IC的负担；另一方面，驱动IC设置在驱动板上，而EOA模块设置在OLED显示基板上，由于驱动板与液晶显示基板的距离相对较远，所以，STV信号的传输线就需设置的相对较长，这样，STV信号就会因衰减较大而产生抖动，从而影响EOA模块的输出信号。
另外，在布局OLED显示面板时，结合图3，EOA模块10和GOA模块20分别设置在OLED显示基板的边界区域，液晶显示基板的中间区域为显示区域(OLED像素单元区域)。而现有的EOA模块10由两部分101、102组成，参考图2A、2B，该EOA模块由于所使用的器件较多，结构复杂，所以占用的边界区域就较多，相应地，显示区域的空间就较小，而边界尺寸是屏产品中的重要指标。
发明内容
本发明要解决的技术问题在于，现有技术的显示面板发光驱动电路需引入STV信号。
本发明解决其技术问题所采用的技术方案是：构造一种显示面板发光驱动电路，包括：
高电平产生单元，用于根据第一组时钟信号生成输出信号，且所述输出信号在所述第一组时钟信号的有效电平期间为高电平信号；
重置单元，用于根据当前级的扫描信号和第二组时钟信号，在所述当前级的扫描信号和所述第二组时钟信号均为有效电平期间，将所述输出信号由高电平信号重置为低电平信号，其中，所述第二组时钟信号的频率是所述第一组时钟信号的频率的两倍；
恢复单元，用于根据后一级的扫描信号，在所述后一级的扫描信号的有效电平期间，将所述输出信号由低电平信号恢复至高电平信号。
优选地，所述高电平产生单元包括N型的第一TFT管、第二TFT管及电容，而且，所述第一TFT管的栅极及漏极一并连接第一组时钟信号，所述第一TFT管的源极连接所述第二TFT管的栅极，所述第二TFT管的漏极连接高电平信号，所述第二TFT管的源极为所述显示面板发光驱动电路的输出端，而且，所述电容连接在所述第二TFT管的栅极及源极之间。
优选地，所述高电平产生单元还包括N型的第三TFT管(T13)，所述第三TFT管的漏极连接高电平信号，所述第三TFT管的栅极连接所述第二TFT管的源极，所述第三TFT管的源极接所述第二TFT管的栅极。
优选地，所述重置单元包括N型的第四TFT管、第五TFT管及第六TFT管，其中，所述第四TFT管的栅极输入当前级的扫描信号，所述第四TFT管的漏极输入第二组时钟信号，所述第四TFT管的源极分别连接所述第五TFT管的栅极及所述第六TFT管的栅极，所述第五TFT管的源极及所述第六TFT管的源极分别接低电平信号，所述第五TFT管的漏极连接所述第二TFT管的源极，所述第六TFT管的漏极连接所述第一TFT管的源极。
优选地，所述恢复单元包括N型的第七TFT管，而且，所述第七TFT管的栅极接后一级的扫描信号，所述第七TFT管的漏极连接所述第四TFT管的源极，所述第七TFT管的源极接低电平信号。
优选地，第一组时钟信号为高电平时，所述第一TFT管、第二TFT管及第三TFT管导通。
优选地，第二组时钟信号为高电平时，所述第四TFT管、所述第五TFT管及第六TFT管导通。
优选地，所述第六TFT管导通后，所述第二TFT管关断。
本发明还构造一种OLED显示面板，包括设置在边界区域的显示面板发光驱动电路，所述显示面板发光驱动电路为以上所述的显示面板发光驱动电路。
优选地，所述OLED显示面板设置有GOA模块，所述显示面板发光驱动电路与所述GOA模块电连接，均设置于所述OLED显示面板的边界区域。
实施本发明的技术方案，显示面板发光驱动电路由于是根据GOA模块输出的扫描信号来产生低电平信号，不再需要从驱动IC引入STV信号，这样便减轻了驱动IC的负担。另外，由于GOA模块与显示面板发光驱动电路均设置在OLED显示面板上，所以两者的距离相比显示面板发光驱动电路与驱动IC之间的距离要小很多，所以，扫描信号的衰减也较小，不会因信号抖动而影响显示面板发光驱动电路的输出信号。
附图说明
为了更清楚地说明本发明实施例，下面将对实施例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。附图中：
图1A是带内部补偿的OLED像素单元的电路图；
图1B是图1A中各个信号的时序图；
图2A是现有技术的一种显示面板发光驱动电路的第一部分的电路图；
图2B是现有技术的一种显示面板发光驱动电路的第一部分的电路图；
图3是现有技术的OLED显示面板的结构示意图；
图4是本发明显示面板发光驱动电路实施例一的电路图；
图5是图4中各个信号的时序图；
图6是本发明OLED显示面板的结构示意图。
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。
图4是本发明显示面板发光驱动电路实施例一的电路图，该实施例的显示面板发光驱动电路包括高电平产生单元11、重置单元12和恢复单元13，其中，高电平产生单元11用于根据第一组时钟信号(CLK)生成输出信号，且输出信号在第一组时钟信号的有效电平期间为高电平信号；重置单元12用于根据当前级的扫描信号(Gn)和第二组时钟信号(CLKB)，在当前级的扫描信号和第二组时钟信号均为有效电平期间，将输出信号由高电平信号重置为低电平信号，其中，第二组时钟信号的频率是第一组时钟信号的频率的两倍；恢复单元13用于根据后一级的扫描信号(Gn+1)，在后一级的扫描信号的有效电平期间，将输出信号由低电平信号恢复至高电平信号。另外需说明的是，第一组时钟信号(CLK)、第二组时钟信号(CLKB)均有驱动IC输出，扫描信号由GOA模块输出。
在该实施例的显示面板发光驱动电路中，首先，高电平产生单元11根据第一组时钟信号生成输出信号，且输出信号在第一组时钟信号的有效电平(高电平)期间为高电平信号；其次，重置单元12在当前级的扫描信号和第二组时钟信号均为有效电平(高电平)期间，将输出信号由高电平信号重置为低电平信号；最后，恢复单元13在后一级的扫描信号的有效电平(高电平)期间，将输出信号由低电平信号恢复至高电平信号，从而实现显示面板发光驱动电路仅在数据输入阶段输出低电平信号，而在其它三个阶段输出高电平信号。而且，该显示面板发光驱动电路由于是根据GOA模块输出的扫描信号来产生低电平信号，所以不再需要从驱动IC引入STV信号，这样便减轻了驱动IC的负担。另外，由于GOA模块与显示面板发光驱动电路均设置在OLED显示面板上，所以两者的距离相比显示面板发光驱动电路与驱动IC之间的距离要小很多，所以，扫描信号的衰减也较小，不会因信号抖动而影响显示面板发光驱动电路的输出信号。
进一步地，在该实施例中，高电平产生单元11具体包括N型的第一TFT管T11、第二TFT管T12、第三TFT管T13及电容C，电容C为皮法(pF)级的电容，而且，第一TFT管T11的栅极及漏极一并连接第一组时钟信号(CLK)，第一TFT管T11的源极连接第二TFT管T12的栅极，第二TFT管T12的漏极连接高电平信号(VGH)，第二TFT管T12的源极为显示面板发光驱动电路的输出端，即输出发光信号(EMS)，而且，电容连接在第二TFT管T12的栅极及源极之间，第三TFT管T13的漏极连接高电平信号(VGH)，第三TFT管T13的栅极连接第二TFT管T12的源极，第三TFT管T13的源极接第二TFT管T12的栅极。而且，第一组时钟信号(CLK)为高电平时，第一TFT管T11、第二TFT管T12及第三TFT管T13依次导通。当然，在其它实施例中，第三TFT管T13也可省去。
在该实施例中，重置单元12具体包括N型的第四TFT管T14、第五TFT管T15及第六TFT管T16，其中，第四TFT管T14的栅极输入当前级的扫描信号(Gn)，第四TFT管T14的漏极输入第二组时钟信号(CLKB)，第四TFT管T14的源极分别连接第五TFT管T15的栅极及第六TFT管T16的栅极，第五TFT管T15的源极及第六TFT管T16的源极分别接低电平信号(VGL)，第五TFT管T15的漏极连接第二TFT管T12的源极，第六TFT管T16的漏极连接第一TFT管T11的源极。而且，第二组时钟信号(CLKB)为高电平时，第四TFT管T14、第五TFT管T15及第六TFT管T16导通。第六TFT管T16导通后，第二TFT管T12关断。
在该实施例中，恢复单元具体包括N型的第七TFT管T17，而且，第七TFT管T17的栅极接后一级的扫描信号(Gn+1)，第七TFT管T17的漏极连接第四TFT管T14的源极，第七TFT管T17的源极接低电平信号。
下面结合图5所示的时序图说明该实施例的显示面板发光驱动电路的工作原理：在高电平输出模式下，第一组时钟信号(CLK)为高电平时，第一TFT管T11导通，进而导致第二TFT管T12及第三TFT管T13导通，此时，该显示面板发光驱动电路所输出的EMS信号为高电平。然后，进入重置模式，扫描信号(Gn)开始为高电平，第四TFT管T14导通，而且，当第二组时钟信号(CLKB)为高电平时，PD节点(node)跳变为高电平，从而导致第五TFT管T15及第六TFT管T16开始导通，该显示面板发光驱动电路所输出的EMS信号因第五TFT管T15的导通而被拉低为低电平，同时，第六TFT管T16的导通将关断TFT管T12。最后，进入恢复模式，当后一级的扫描信号(Gn+1)为高电平时，第七TFT管T17开始导通，从而将PD节点(node)拉低为低电平，此时，第五TFT管T15关断，该显示面板发光驱动电路所输出的EMS信号重新恢复为高电平。
该实施例的显示面板发光驱动电路相比现有技术中显示面板发光驱动电路，所使用的TFT管的数量减少，结构也更简单，因此，不但使得显示面板发光驱动电路所占用的面积更小，而且也可提高显示面板发光驱动电路生产工艺上的良率。
本发明还构造一种OLED显示面板，该OLED显示面板包括设置在边界区域的显示面板发光驱动电路和GOA模块，且显示面板发光驱动电路和GOA模块电连接，其中，显示面板发光驱动电路的电路结构可参照前文所述，在此不做赘述。而且，结合图6，在布局OLED显示面板时，由于显示面板发光驱动电路10′和GOA模块20′均设置在OLED显示面板的边界区域，而显示面板发光驱动电路10′因所使用的器件数量减少而使得占用的面积也减小，所以，相比现有技术，可减小OLED显示面板的边界尺寸。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何纂改、等同替换、改进等，均应包含在本发明的权利要求范围之内。

Claims (10)

1.一种显示面板发光驱动电路，其特征在于，包括：
高电平产生单元，用于根据第一组时钟信号生成输出信号，且所述输出信号在所述第一组时钟信号的有效电平期间为高电平信号；
重置单元，用于根据当前级的扫描信号和第二组时钟信号，在所述当前级的扫描信号和所述第二组时钟信号均为有效电平期间，将所述输出信号由高电平信号重置为低电平信号，其中，所述第二组时钟信号的频率是所述第一组时钟信号的频率的两倍；
恢复单元，用于根据后一级的扫描信号，在所述后一级的扫描信号的有效电平期间，将所述输出信号由低电平信号恢复至高电平信号。
2.根据权利要求1所述的显示面板发光驱动电路，其特征在于，所述高电平产生单元包括N型的第一TFT管(T11)、第二TFT管(T12)及电容(C)，而且，所述第一TFT管(T11)的栅极及漏极一并连接第一组时钟信号，所述第一TFT管(T11)的源极连接所述第二TFT管(T12)的栅极，所述第二TFT管(T12)的漏极连接高电平信号，所述第二TFT管(T12)的源极为所述显示面板发光驱动电路的输出端，而且，所述电容连接在所述第二TFT管(T12)的栅极及源极之间。
3.根据权利要求2所述的显示面板发光驱动电路，其特征在于，所述高电平产生单元还包括N型的第三TFT管(T13)，所述第三TFT管(T13)的漏极连接高电平信号，所述第三TFT管(T13)的栅极连接所述第二TFT管(T12)的源极，所述第三TFT管(T13)的源极接所述第二TFT管(T12)的栅极。
4.根据权利要求3所述的显示面板发光驱动电路，其特征在于，所述重置单元包括N型的第四TFT管(T14)、第五TFT管(T15)及第六TFT管(T16)，其中，所述第四TFT管(T14)的栅极输入当前级的扫描信号，所述第四TFT管(T14)的漏极输入第二组时钟信号，所述第四TFT管(T14)的源极分别连接所述第五TFT管(T15)的栅极及所述第六TFT管(T16)的栅极，所述第五TFT管(T15)的源极及所述第六TFT管(T16)的源极分别接低电平信号，所述第五TFT管(T15)的漏极连接所述第二TFT管(T12)的源极，所述第六TFT管(T16)的漏极连接所述第一TFT管(T11)的源极。
5.根据权利要求4所述的显示面板发光驱动电路，其特征在于，所述恢复单元包括N型的第七TFT管(T17)，而且，所述第七TFT管(T17)的栅极接后一级的扫描信号，所述第七TFT管(T17)的漏极连接所述第四TFT管(T14)的源极，所述第七TFT管(T17)的源极接低电平信号。
6.根据权利要求5所述的显示面板发光驱动电路，其特征在于，第一组时钟信号为高电平时，所述第一TFT管(T11)、第二TFT管(T12)及第三TFT管(T13)导通。
7.根据权利要求6所述的显示面板发光驱动电路，其特征在于，第二组时钟信号为高电平时，所述第四TFT管(T14)、所述第五TFT管(T15)及第六TFT管(T16)导通。
8.根据权利要求7所述的显示面板发光驱动电路，其特征在于，所述第六TFT管(T16)导通后，所述第二TFT管(T12)关断。
9.一种OLED显示面板，包括设置在边界区域的显示面板发光驱动电路，其特征在于，所述显示面板发光驱动电路为权利要求1-8任一项所述的显示面板发光驱动电路。
10.根据权利要求9所述的OLED显示面板，其特征在于，所述OLED显示面板设置有GOA模块，所述显示面板发光驱动电路与所述GOA模块电连接，均设置于所述OLED显示面板的边界区域。
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