CN107016960A - Oled触控驱动电路及方法、触控面板 - Google Patents
Oled触控驱动电路及方法、触控面板 Download PDFInfo
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Abstract
本公开涉及一种OLED触控驱动电路及方法、以及触控面板。该触控驱动电路包括:驱动晶体管,控制端接收数据信号、第一端接收电源信号;触控电极,用于传输触控信号;发光元件,第一极连接所述驱动晶体管的第二端、第二极与所述触控电极形成寄生电容;第一晶体管,控制端接收扫描信号、第一端接收数据信号、第二端连接所述驱动晶体管的控制端;控制单元,用于响应控制信号以将补偿信号传输至所述驱动晶体管的第二端;其中,所述电源信号、所述数据信号、所述触控信号、以及所述补偿信号在触控阶段为同步调制信号。本公开可在消除负载电容的同时保证OLED发光亮度不受影响。
Description
技术领域
本公开涉及显示技术领域,尤其涉及一种OLED触控驱动电路及方法、触控面板。
背景技术
随着自发光显示技术的发展,有机发光二极管显示器(Organic Light EmittingDiode,OLED)以其低能耗、低成本、宽视角、以及响应速度快等优点,逐渐开始取代传统的液晶显示器(Liquid Crystal Display,LCD)。目前,自容式In-cell触控技术在LCD方面的应用已经十分成熟。但由于触控电极是利用公共电极层实现的,其与连接薄膜晶体管(ThinFilm Transistor,TFT)的栅线/数据线之间会形成寄生电容,且由此产生的电容负载很大,因此现有技术通过对公共电极线、栅线和数据线施加同步电压的方式来实现负载电容的消除。
当自容式In-cell触控技术应用于OLED显示器时,其实现方式如图1所示,即在薄膜封装层上沉积金属层,以在显示区的非显示部分制作触控电极10(TX&RX),其等效电路可参考图2,其中控制晶体管T和驱动晶体管DT以及存储电容CS可组成传统的2T1C结构的OLED驱动电路。在此基础上,为了减少触控电极10与OLED基板的电极/走线例如阴极20之间的负载例如寄生电容CCT,可以采用上述的同步电压调变方式来实现负载电容的消除,即对连接控制晶体管T的源极的数据信号VDATA、连接驱动晶体管DT的源极的电源信号VDD、以及触控信号VT施加同步电压。但OLED是一种电流驱动器件,该调变方式会导致驱动晶体管DT的源极S和漏极D变化不同步,由此造成的驱动晶体管DT的源漏电压差VDS差异会使驱动电流发生变化,从而导致OLED的实际发光亮度偏离了预期的发光亮度。
需要说明的是,在上述背景技术部分公开的信息仅用于加强对本公开的背景的理解,因此可以包括不构成对本领域普通技术人员已知的现有技术的信息。
发明内容
本公开的目的在于提供一种OLED触控驱动电路及方法、触控面板,进而至少在一定程度上克服由于相关技术的限制和缺陷而导致的一个或者多个问题。
本公开的其他特性和优点将通过下面的详细描述变得显然,或部分地通过本公开的实践而习得。
根据本公开的一个方面,提供一种OLED触控驱动电路,包括:
驱动晶体管,具有控制端、第一端和第二端,控制端接收数据信号、第一端接收电源信号;
触控电极,用于传输触控信号;
发光元件,具有第一极和第二极,第一极连接所述驱动晶体管的第二端、第二极与所述触控电极形成寄生电容;
第一晶体管,具有控制端、第一端和第二端,控制端接收扫描信号、第一端接收数据信号、第二端连接所述驱动晶体管的控制端;
控制单元,连接所述驱动晶体管的第二端,用于响应控制信号以将补偿信号传输至所述驱动晶体管的第二端;
其中,所述电源信号、所述数据信号、所述触控信号、以及所述补偿信号在触控阶段为同步调制信号。
本公开的一种示例性实施例中,所述控制单元包括:
第二晶体管,具有控制端、第一端和第二端,控制端接收所述控制信号、第二端连接所述驱动晶体管的第二端;
调制电容,具有第一极和第二极,第一极接收所述补偿信号、第二极连接所述第二晶体管的第一端。
本公开的一种示例性实施例中,所述同步调制信号中的调制电压相同。
本公开的一种示例性实施例中,所述触控驱动电路还包括:
存储电容,连接于所述驱动晶体管的控制端与第一端之间。
本公开的一种示例性实施例中,所述触控驱动电路还包括:
存储电容,连接于所述驱动晶体管的控制端与第二端之间。
本公开的一种示例性实施例中,所有晶体管均为P型晶体管或者均为N型晶体管。
根据本公开的一个方面,提供一种OLED触控驱动方法,用于驱动上述的OLED触控驱动电路;所述触控驱动方法包括:
在触控阶段,触控电极传输触控信号;
第一晶体管响应扫描信号以将数据信号传输至驱动晶体管的控制端;
控制单元响应控制信号以将补偿信号传输至所述驱动晶体管的第二端;
所述驱动晶体管响应通过所述第一晶体管传输的所述数据信号以在电源信号的作用下输出驱动电流,并驱动发光元件进行发光;
其中,所述电源电压信号、所述数据信号、所述触控信号、以及所述补偿信号输出为同步调制信号。
本公开的一种示例性实施例中,所述同步调制信号的调制电压相同。
根据本公开的一个方面,提供一种OLED触控面板,包括上述的OLED触控驱动电路。
本公开的一种示例性实施例中,所述触控面板包括:
多条扫描线,用于提供扫描信号;
多条数据线,用于提供数据信号;
以及触控单元,用于发送触控驱动信号以及接收触控感应信号。
本公开示例性实施方式所提供的OLED触控驱动电路及触控驱动方法、OLED触控面板,通过在触控阶段对电源信号、数据信号、触控信号、以及补偿信号施加同步调制信号,即可消除触控电极与OLED发光元件的第二极之间产生的寄生电容,同时还可使驱动晶体管的源极和漏极的电压变化保持同步,以使驱动晶体管的源漏电压差VDS保持相对不变,从而避免由VDS的变化所造成的OLED发光元件的驱动电流的变化,确保OLED发光元件的发光亮度不会偏离预期的发光亮度,进而保证显示品质。
应当理解的是,以上的一般描述和后文的细节描述仅是示例性和解释性的,并不能限制本公开。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分,示出了符合本公开的实施例,并与说明书一起用于解释本公开的原理。显而易见地,下面描述中的附图仅仅是本公开的一些实施例,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示意性示出现有技术中自容式OLED触控面板的示意图;
图2示意性示出图1所示的OLED触控面板的等效电路图;
图3示意性示出本公开示例性实施例中OLED触控驱动电路的结构示意图一;
图4示意性示出本公开示例性实施例中OLED触控驱动电路的结构示意图二。
附图标记:
10 触控电极(TX&RX)
20 阴极
DT 驱动晶体管
T 控制晶体管
T1 第一晶体管
T2 第二晶体管
VDD 电源信号
VDATA 数据信号
VT 触控信号
VSEL 扫描信号
VEN 控制信号
VMOD 补偿信号
VDS 源漏电压差
CS 存储电容
CCT 寄生电容
CMOD 调制电容
具体实施方式
现在将参考附图更全面地描述示例实施方式。然而,示例实施方式能够以多种形式实施,且不应被理解为限于在此阐述的范例;相反,提供这些实施方式使得本公开将更加全面和完整,并将示例实施方式的构思全面地传达给本领域的技术人员。所描述的特征、结构或特性可以以任何合适的方式结合在一个或更多实施方式中。
此外,附图仅为本公开的示意性图解,并非一定是按比例绘制。图中相同的附图标记表示相同或类似的部分,因而将省略对它们的重复描述。附图中所示的一些方框图是功能实体,不一定必须与物理或逻辑上独立的实体相对应。可以采用软件形式来实现这些功能实体,或在一个或多个硬件模块或集成电路中实现这些功能实体,或在不同网络和/或处理器装置和/或微控制器装置中实现这些功能实体。
本示例实施方式提供了一种OLED触控驱动电路,如图3所示,该触控驱动电路可以包括:
驱动晶体管DT,具有控制端、第一端和第二端,其控制端接收数据信号VDATA、第一端接收电源信号VDD、第二端连接OLED发光元件,用于响应数据信号VDATA以将电源信号VDD传输至OLED发光元件的第一极;
触控电极VT,连接触控信号端,用于传输触控信号VT;
OLED发光元件,具有第一极和第二极,其第一极连接驱动晶体管DT的第二端、第二极与触控电极(TX&RX)形成寄生电容CCT,用于在驱动晶体管DT的输出电流(即OLED发光元件的驱动电流)的作用下进行发光;
第一晶体管T1,具有控制端、第一端和第二端,其控制端接收扫描信号VSEL、第一端接收数据信号VDATA、第二端连接驱动晶体管DT的控制端,用于响应扫描信号VSEL以将数据信号VDATA传输至驱动晶体管DT的控制端;
控制单元,连接控制信号端、补偿信号端、以及驱动晶体管DT的第二端,用于响应控制信号VEN以将补偿信号VMOD传输至驱动晶体管DT的第二端;
其中,所述电源信号VDD、所述数据信号VDATA、所述触控信号VT、以及所述补偿信号VMOD在触控阶段为同步调制信号。
在触控阶段,为了保证各个同步调制信号能够准确的施加在驱动晶体管DT和OLED发光元件的各端或各极,则需保证第一晶体管T1和控制单元为常通状态,其具体可以通过控制扫描信号VSEL和控制信号VEN的电位来实现。
需要说明的是:所述驱动晶体管DT的控制端用于接收数据信号VDATA,但其并未直接与数据信号端相连,而是通过第一晶体管T1来接收所述数据信号VDATA的。
本公开示例性实施方式所提供的OLED触控驱动电路,通过在触控阶段对电源信号VDD、数据信号VDATA、触控信号VT、以及补偿信号VMOD施加同步调制信号,即可消除触控电极(TX&RX)与OLED发光元件的第二极之间产生的寄生电容CCT,同时还可使驱动晶体管DT的源极S和漏极D的电压变化保持同步,以使驱动晶体管DT的源漏电压差VDS保持相对不变,从而避免由VDS的变化所造成的OLED发光元件的驱动电流的变化,确保OLED发光元件的发光亮度不会偏离预期的发光亮度,进而保证显示品质。
基于上述描述,所述同步调制信号可以为频率相同、相位相同、且调制电压也相同的信号;即,该同步调制信号为完全一致的电压信号,这样有利于保持驱动晶体管DT各端电压变化的一致性。
在此基础上,参考图4所示,所述控制单元可以包括:
第二晶体管T2,具有控制端、第一端和第二端,其控制端接收控制信号VEN、第一端连接调制电容CMOD、第二端连接驱动晶体管DT的第二端;
调制电容CMOD,具有第一极和第二极,第一极接收补偿信号VMOD、第二极连接第二晶体管T2的第一端。
其中,所述补偿信号VMOD可以通过调制电容CMOD传输至第二晶体管T2的第一端,第二晶体管T2可以响应控制信号VEN以将补偿信号VMOD传输至驱动晶体管DT的第二端。
本示例实施方式所提供的OLED触控驱动电路可用于消除OLED触控面板内部的触控电极(TX&RX)与OLED基板的电极/走线之间的寄生电容。其中,所述触控电极(TX&RX)可以包括驱动电极TX和感应电极RX,且驱动电极TX和感应电极RX可以位于同一层,但不限于此。
需要说明的是:本实施例中的OLED触控面板可以为自容式触控面板,也可以为互容式触控面板,只要其触控电极与OLED基板的电极/走线之间存在寄生电容,且该寄生电容可以通过本示例实施方式中的方法进行消除,即落在本发明的保护范围之内。
可选的,所述OLED发光元件的第一极可以是阳极、第二极可以是阴极;其中,阳极材质可以为氧化铟锡(Indium Tin Oxide,ITO),阴极材质可以为金属或合金。当然,所述OLED发光元件的第一极也可以是阳极、第二极也可以是阴极,这里对此不做具体限定。
可选的,所有晶体管可以均为P型晶体管或者均为N型晶体管。本实施例通过统一晶体管的类型,有利于简化制造工艺。具体的,所有晶体管可以均采用MOS(Metal OxideSemiconductor,金属-氧化物-半导体场效应晶体管)场效应晶体管,其可以均采用P型MOS管或者均采用N型MOS管。需要说明的是:针对不同的晶体管类型,各个信号端的电平信号需要相应的调整变化。
本示例实施方式中,为了保证OLED发光元件能够在显示阶段正常发光,还需设置一用于保持驱动晶体管DT的控制端电压的存储电容Cs,该存储电容Cs可以设置在驱动晶体管DT的控制端与第一端之间,也可以设置在驱动晶体管DT的控制端与第二端之间,其具体设置方式可以根据OLED电极与驱动晶体管DT的连接方式进行相应的调节。
下面结合图4对本示例实施方式所提供的OLED触控驱动电路的工作过程进行详细的说明。
显示阶段:第一晶体管T1响应扫描信号VSEL而导通,将数据信号VDATA传输至驱动晶体管DT的控制端并对存储电容Cs充电;驱动晶体管DT响应其控制端接收到的数据信号VDATA而导通,在电源信号VDD的作用下输出驱动电流,控制OLED发光元件进行发光。
触控阶段:触控电极(TX&RX)接收触控信号VT,并感应触控操作而产生感应信号;第二晶体管T2响应控制信号VEN而导通,以使调制电容CMOD与驱动晶体管DT的漏极D具有相同的电位;其中,在进行电容消除调制时,第一晶体管T1导通和第二晶体管T2均导通,数据信号VDATA施加至驱动晶体管DT的控制端,电源信号VDD施加至驱动晶体管DT的第一端,补偿信号VMOD通过调制电容CMOD施加至驱动晶体管DT的第二端即OLED发光元件的第一极,触控信号VT施加至触控电极;通过对电源信号VDD、数据信号VDATA、触控信号VT、以及补偿信号VMOD施加频率、相位及电压均相同的同步电压信号,使得驱动晶体管DT的各端(控制端、第一端和第二端)以及OLED发光元件的各极(第一极和第二极)的电压变化保持一致,从而在消除触控电极(TX&RX)与OLED发光元件的第二极之间产生的寄生电容CCT的同时,保证了驱动晶体管DT的源漏电压差VDS相对不变,从而避免由OLED发光元件的驱动电流的变化,确保OLED发光元件的发光亮度不受影响。
本示例实施方式中还提供了一种OLED触控面板,包括上述的触控驱动电路。在此基础上,该触控面板还可以包括:
多条扫描线,用于提供扫描信号VSEL;
多条数据线,用于提供数据信号VDATA;
触控单元,用于发送触控驱动信号以及接收触控感应信号。
本示例实施方式中,所述触控面板可用于形成显示装置。其中,所述显示装置例如可以包括手机、平板电脑、电视机、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。
应当注意,尽管在上文详细描述中提及了用于动作执行的设备的若干模块或者单元,但是这种划分并非强制性的。实际上,根据本公开的实施方式,上文描述的两个或更多模块或者单元的特征和功能可以在一个模块或者单元中具体化。反之,上文描述的一个模块或者单元的特征和功能可以进一步划分为由多个模块或者单元来具体化。
此外,尽管在附图中以特定顺序描述了本公开中方法的各个步骤,但是,这并非要求或者暗示必须按照该特定顺序来执行这些步骤,或是必须执行全部所示的步骤才能实现期望的结果。附加的或备选的,可以省略某些步骤,将多个步骤合并为一个步骤执行,以及/或者将一个步骤分解为多个步骤执行等。
通过以上的实施方式的描述,本领域的技术人员易于理解,这里描述的示例实施方式可以通过软件实现,也可以通过软件结合必要的硬件的方式来实现。因此,根据本公开实施方式的技术方案可以以软件产品的形式体现出来,该软件产品可以存储在一个非易失性存储介质(可以是CD-ROM,U盘,移动硬盘等)中或网络上,包括若干指令以使得一台计算设备(可以是个人计算机、服务器、移动终端、或者网络设备等)执行根据本公开实施方式的方法。
本领域技术人员在考虑说明书及实践这里公开的发明后,将容易想到本公开的其它实施方案。本申请旨在涵盖本公开的任何变型、用途或者适应性变化,这些变型、用途或者适应性变化遵循本公开的一般性原理并包括本公开未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的,本公开的真正范围和精神由所附的权利要求指出。
Claims (10)
1.一种OLED触控驱动电路,其特征在于,包括:
驱动晶体管,具有控制端、第一端和第二端,控制端接收数据信号、第一端接收电源信号;
触控电极,用于传输触控信号;
发光元件,具有第一极和第二极,第一极连接所述驱动晶体管的第二端、第二极与所述触控电极形成寄生电容;
第一晶体管,具有控制端、第一端和第二端,控制端接收扫描信号、第一端接收数据信号、第二端连接所述驱动晶体管的控制端;
控制单元,连接所述驱动晶体管的第二端,用于响应控制信号以将补偿信号传输至所述驱动晶体管的第二端;
其中,所述电源信号、所述数据信号、所述触控信号、以及所述补偿信号在触控阶段为同步调制信号。
2.根据权利要求1所述的触控驱动电路,其特征在于,所述控制单元包括:
第二晶体管,具有控制端、第一端和第二端,控制端接收所述控制信号、第二端连接所述驱动晶体管的第二端;
调制电容,具有第一极和第二极,第一极接收所述补偿信号、第二极连接所述第二晶体管的第一端。
3.根据权利要求1所述的触控驱动电路,其特征在于,所述同步调制信号中的调制电压相同。
4.根据权利要求1-3任一项所述的触控驱动电路,其特征在于,所述触控驱动电路还包括:
存储电容,连接于所述驱动晶体管的控制端与第一端之间。
5.根据权利要求1-3任一项所述的触控驱动电路,其特征在于,所述触控驱动电路还包括:
存储电容,连接于所述驱动晶体管的控制端与第二端之间。
6.根据权利要求1-3任一项所述的触控驱动电路,其特征在于,所有晶体管均为P型晶体管或者均为N型晶体管。
7.一种OLED触控驱动方法,用于驱动权利要求1-6任一项所述的OLED触控驱动电路;其特征在于,所述触控驱动方法包括:
在触控阶段,触控电极传输触控信号;
第一晶体管响应扫描信号以将数据信号传输至驱动晶体管的控制端;
控制单元响应控制信号以将补偿信号传输至所述驱动晶体管的第二端;
所述驱动晶体管响应通过所述第一晶体管传输的所述数据信号以在电源信号的作用下输出驱动电流,并驱动发光元件进行发光;
其中,所述电源电压信号、所述数据信号、所述触控信号、以及所述补偿信号输出为同步调制信号。
8.根据权利要求7所述的触控驱动方法,其特征在于,所述同步调制信号的调制电压相同。
9.一种OLED触控面板,其特征在于,包括权利要求1-6任一项所述的OLED触控驱动电路。
10.根据权利要求9所述的触控面板,其特征在于,所述触控面板包括:
多条扫描线,用于提供扫描信号;
多条数据线,用于提供数据信号;
以及触控单元,用于发送触控驱动信号以及接收触控感应信号。
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US20190163307A1 (en) | 2019-05-30 |
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