CN104866153A - 自电容式内嵌触摸屏及其制备方法、液晶显示器 - Google Patents

自电容式内嵌触摸屏及其制备方法、液晶显示器 Download PDF

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CN104866153A
CN104866153A CN201510290262.0A CN201510290262A CN104866153A CN 104866153 A CN104866153 A CN 104866153A CN 201510290262 A CN201510290262 A CN 201510290262A CN 104866153 A CN104866153 A CN 104866153A
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insulation course
electrode
touch
self
control sensing
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CN104866153B (zh
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虞晓江
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Wuhan China Star Optoelectronics Technology Co Ltd
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Abstract

本发明公开了一种自电容式内嵌触摸屏,包括阵列基板,该阵列基板包括玻璃基板以及设置在玻璃基板上的薄膜晶体管和与薄膜晶体管电性连接的像素电极,像素电极与薄膜晶体管之间设置有平坦化层,其中,平坦化层上还依次设置有透明的触控感应电极、第一绝缘层、第二绝缘层以及金属连接线,金属连接线通过过孔电性连接到触控感应电极;其中,第一绝缘层延伸至平坦化层与像素电极之间,第二绝缘层延伸至像素电极上;其中,触控感应电极还被配置为公共电极,在一帧画面的显示时间内,触控感应电极用于分时地传递公共电压和触摸扫描信号。本发明还公开了如上所述自电容式内嵌触摸屏的制备方法以及包含该内嵌触摸屏的液晶显示器。

Description

自电容式内嵌触摸屏及其制备方法、液晶显示器
技术领域
本发明涉及触控技术领域,尤其涉及一种自电容式内嵌触摸屏及其制备方法,还涉及包含该内嵌触摸屏的液晶显示器。
背景技术
触摸显示屏作为一种输入媒介,是目前最简单、方便的一种人机交互方式,因此触摸显示屏越来越多地应用到各种电子产品中。基于不同的工作原理以及传输信息的介质,触摸屏产品可以分为四种:红外线触摸屏、电容式触摸屏、电阻触摸屏和表面声波触摸屏;其中电容式触摸屏由于具有寿命长、透光率高、可以支持多点触控等优点成为目前主流的触摸屏技术。电容式触摸屏包括表面电容式和投射电容式,其中投射电容式又可以分为自电容式和互电容式。对于自电容触摸结构,由于其触控感应的准确度和信噪比比较高,因而受到了各大面板厂家青睐。
目前,自电容式触摸结构利用自电容的原理实现检测手指触摸位置,具体为:在触摸结构中设置多个触控感应电极,当人体未触碰屏幕时,各触控感应电极所感知的电容为一固定值,当人体触碰屏幕时,触碰位置对应的触控感应电极所感知的电容受人体影响,触控侦测芯片在触控时间段通过检测各触控感应电极的电容值变化可以判断出触控位置。
图1为现有的一种自电容式触摸屏结构的电极分布示意图,如图1所示的,该自电容式触摸屏结构包括阵列设置的触控感应电极7,每一个触控感应电极7需要通过单独的金属连接线5与触控侦测芯片(附图中未示出)连接。其中,触控感应电极7和金属连接线5为具有绝缘层(附图中未示出)隔离的异层设置,触控感应电极7与对应的金属连接线5通过过孔电性连接。具体地,对于一列触控感应电极,每根金属连接线连接到相应的触控感应电极前均不与前面的触控感应电极相连,连接到相应的触控感应电极后该金属连接线将不与后面的触控感应电极继续连接。
对于自电容式内嵌(in-cell)触摸屏,通常是将触摸屏结构中的触控感应电极和金属连接线直接设置在阵列基板或滤光基板上。图2是现有的一种具有触摸屏结构的阵列基板的局部结构示意图。如图2所示,该阵列基板包括玻璃基板1以及设置在玻璃基板1上的薄膜晶体管2和与薄膜晶体管2电性连接的像素电极3,像素电极3与薄膜晶体管2之间设置有平坦化层4。触摸屏结构设置在平坦化层上,具体为:首先在平坦化层4上制备形成金属连接线5,然后在金属连接线5上覆设第一绝缘层6,进一步地在第一绝缘层6上设置触控感应电极7,触控感应电极7通过过孔电性连接到金属连接线5,最后在触控感应电极7上覆设第二绝缘层8。其中第一绝缘层6和第二绝缘层8依次位于平坦化层4与像素电极3之间,像素电极3通过设置于平坦化层4、第一绝缘层6和第二绝缘层8中的过孔电性连接到薄膜晶体管2(连接到薄膜晶体管2的源极或漏极)。其中,触控感应电极7还被配置为公共电极,在一帧画面的显示时间内,所述触控感应电极7用于分时地传递公共电压(Vcom)和触摸扫描信号。
在如上结构的阵列基板中,平坦化层4的材料为有机材料,金属连接线5的材料为金属材料,通过沉积工艺在平坦化层4上制备金属连接线5时,沉积工艺时的高温会使平坦化层4放出气体,而由于金属连接线5的宽度较小而厚度较大,因此导致金属连接线5与平坦化层4之间的附着力较小,易于脱落,影响了产品的品质。
发明内容
鉴于现有技术存在的不足,本发明提供了一种自电容式内嵌触摸屏,通过对设置于阵列基板中的触摸屏结构进行改进,改善了触摸屏结构与阵列基板之间的附着力,提升了产品的品质,降低了生产成本。
为了实现上述目的,本发明采用了如下的技术方案:
一种自电容式内嵌触摸屏,包括阵列基板,所述阵列基板包括玻璃基板以及设置在玻璃基板上的薄膜晶体管和与薄膜晶体管电性连接的像素电极,所述像素电极与所述薄膜晶体管之间设置有平坦化层,其中,所述平坦化层上依次设置有透明的触控感应电极、第一绝缘层、第二绝缘层以及金属连接线,所述金属连接线通过设置于所述第一绝缘层和第二绝缘层中的过孔电性连接到所述触控感应电极;其中,所述第一绝缘层延伸至所述平坦化层与所述像素电极之间,第二绝缘层延伸至所述像素电极上,所述像素电极通过设置于所述第一绝缘层和平坦化层中的过孔电性连接到所述薄膜晶体管;
其中,所述触控感应电极还被配置为公共电极,在一帧画面的显示时间内,所述触控感应电极用于分时地传递公共电压和触摸扫描信号。
其中,所述触控感应电极和所述像素电极的材料为ITO,所述平坦化层的材料为有机材料,所述金属连接线的材料为金属材料。
其中,所述第一绝缘层和所述第二绝缘层的材料为SiNx、SiOx或SiNxOy
其中,所述薄膜晶体管包括源极、漏极、栅极和有源层,所述有源层连接于所述玻璃基板上,所述源极和漏极同层设置且位于所述有源层上方,所述栅极位于所述源极和漏极上方;所述源极和漏极与所述有源层之间设置有第三绝缘层,所述源极和漏极分别通过设置于所述第三绝缘层中的过孔连接到所述有源层;所述源极和漏极与所述栅极之间设置有第四绝缘层。
其中,所述有源层与所述源极、漏极之间还设置有欧姆接触层。
其中,所述第三绝缘层和所述第四绝缘层的材料为SiNx、SiOx或SiNxOy
其中,该自电容式内嵌触摸屏还包括与所述阵列基板相对设置滤光基板以及设置于所述阵列基板和所述滤光基板之间的液晶层。
如上提供的自电容式内嵌触摸屏的制备方法,包括制备阵列基板的步骤,其中,所述阵列基板的制备工艺包括:
S10、提供一玻璃基板并在玻璃基板上制备薄膜晶体管阵列;
S20、在具有薄膜晶体管阵列的玻璃基板上形成一平坦化层;
S30、在所述平坦化层上形成透明的触控感应电极;
S40、在具有触控感应电极的平坦化层上形成第一绝缘层;
S50、在所述第一绝缘层和平坦化层中对应于所述薄膜晶体管的上方开设第一过孔;
S60、在所述第一绝缘层上形成像素电极,所述像素电极通过所述第一过孔电性连接到所述薄膜晶体管;
S70、在具有像素电极的第一绝缘层上形成第二绝缘层,并在所述第一绝缘层和第二绝缘层中对应于所述触控感应电极的上方开设第二过孔;
S80、在所述第二绝缘层上形成金属连接线,所述金属连接线通过所述第二过孔电性连接到所述触控感应电极。
本发明的另一方面是提供一种液晶显示器,包括液晶显示屏及背光模组,所述液晶显示屏与所述背光模组相对设置,所述背光模组提供显示光源给所述液晶显示屏,以使所述液晶显示屏显示影像,其中,所述液晶显示屏采用如上所述的自电容式内嵌触摸屏。
本发明实施例中提供的自电容式内嵌触摸屏,内嵌触摸屏的阵列基板中设置有触摸屏结构,其中的触摸屏结构包括依次形成在平坦化层上的触控感应电极、第一绝缘层、第二绝缘层和金属连接线,由于触控感应电极相对于金属连接线具有更大的宽度和更小的厚度,沉积工艺时的高温使平坦化层放出的气体对触控感应电极与平坦化层之间的附着力影响较小,改善了现有技术中先制备金属连接线时附着力小的问题,提升了产品的品质,降低了生产成本。另外,第二绝缘层还隔离了金属连接线与像素电极,避免了金属连接线与像素电极之间发生短路。
附图说明
图1是现有的一种自电容式触摸屏结构的电极分布示意图。
图2是现有的一种具有触摸屏结构的阵列基板的局部结构示意图。
图3是本发明实施例提供的电容式内嵌触摸屏的结构示意图。
图4是本发明实施例提供的具有触摸屏结构的阵列基板的局部结构示意图。
图5是本发明实施例提供的液晶显示器的结构示意图。
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详细地描述,显然,所描述的实施例仅仅是本发明一部分实例,而不是全部实施例。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的前提下所获得的所有其他实施例,都属于本发明保护范围。
本实施例首先提供了一种自电容式内嵌触摸屏。如图3所示,该嵌触摸屏包括相对设置的阵列基板30和滤光基板40以及设置于阵列基板30和滤光基板40之间的液晶层50。其中,触摸屏结构内嵌于阵列基板30中。
具体地,如图4所示,阵列基板30包括玻璃基板1以及设置在玻璃基板1上的薄膜晶体管2,薄膜晶体管2上覆设有一平坦化层4。像素电极3和触摸屏结构分别设置于平坦化层4上并且相互绝缘。具体地,触摸屏结构包括异层设置的触控感应电极7和金属连接线5,首先在平坦化层4上通过沉积工艺制备出触控感应电极7,然后在触控感应电极7上依次设置第一绝缘层6和第二绝缘层8,最后在第二绝缘层8上设置金属连接线5,其中,金属连接线5通过设置于第一绝缘层6和第二绝缘层8中的过孔电性连接到触控感应电极7。进一步地,第一绝缘层6延伸至平坦化层4与像素电极3之间,第二绝缘层8延伸至像素电极3上,像素电极3通过设置于第一绝缘层6和平坦化层4中的过孔电性连接到薄膜晶体管2(连接到薄膜晶体管2的源极或漏极),第二绝缘层8起到绝缘隔离金属连接线5与像素电极3的作用,避免了金属连接线5与像素电极3之间发生短路。进一步地,所述触控感应电极7还被配置为公共电极,在一帧画面的显示时间内,所述触控感应电极7用于分时地传递公共电压(Vcom)和触摸扫描信号。
其中,所述触控感应电极7和所述像素电极3的材料采用透明导电材料,例如可以选择为ITO。所述平坦化层4的材料为有机材料,所述金属连接线5的材料为金属材料,其可以是多层金属材料组成,例如可以是依次为Mo/Al/Mo三层金属材料。
如上结构的阵列基板中,其中的触摸屏结构包括依次形成在平坦化层4上的触控感应电极7、第一绝缘层6、第二绝缘层8和金属连接线5,由于触控感应电极7相对于金属连接线5具有更大的宽度和更小的厚度,沉积工艺时的高温使平坦化层4放出的气体对触控感应电极7与平坦化层4之间的附着力影响较小,改善了现有技术中先制备金属连接线5时附着力小的问题,提升了产品的品质,降低了生产成本。
其中,如图4所示的,所述薄膜晶体管2包括源极21、漏极22、栅极23和有源层24,所述有源层24连接于所述玻璃基板1上,所述源极21和漏极22同层设置且位于所述有源层24上方,所述栅极23位于所述源极21和漏极22上方。所述源极21和漏极22与所述有源层24之间设置有第三绝缘层9,所述源极21和漏极22分别通过设置于所述第三绝缘层9中的过孔连接到所述有源层24,所述源极21和漏极22与所述栅极23之间设置有第四绝缘层10。其中,像素电极3通过设置于第一绝缘层6和平坦化层4中的过孔电性连接到薄膜晶体管2的漏极22。
进一步地,为了使所述源极21和漏极22与所述有源层24之间具有良好的电接触,所述有源层24与所述源极21、漏极22之间还设置有欧姆接触层25,欧姆接触层25的具体材料为N+Si。
进一步地,在本实施例中,所述第一绝缘层6和所述第二绝缘层8的材料可以选择为SiNx、SiOx或SiNxOy;第三绝缘层9和第四绝缘层10的材料也是可以选择为SiNx、SiOx或SiNxOy
更具体地,阵列基板30的制备工艺主要包括步骤:
S10、提供一玻璃基板1并在玻璃基板1上制备薄膜晶体管2阵列。
S20、在具有薄膜晶体管2阵列的玻璃基板1上形成一平坦化层4。
S30、在所述平坦化层4上形成透明的触控感应电极7。其中,首先是通过沉积工艺在平坦化层4上形成触控感应电极7的薄膜层,然后再通过光刻工艺获得图形化的触控感应电极7。更具体地,由于触控感应电极7还被配置为公共电极,因此该步骤的制备工艺中也可以这样理解:首先通过沉积工艺在平坦化层4上形成公共电极层薄膜,然后再通过光刻工艺,将公共电极层薄膜分割形成多个图形化的触控感应电极7(附图中仅示出了其中的一个),因此,位于同一结构层中的多个触控感应电极7可以作为显示的公共电极,在一帧画面的显示时间内,触控感应电极7用于分时地传递公共电压(Vcom)和触摸扫描信号。
S40、在具有触控感应电极7的平坦化层4上形成第一绝缘层6。其中,第一绝缘层6覆盖触控感应电极7和平坦化层4。
S50、在所述第一绝缘层6和平坦化层4中对应于所述薄膜晶体管2的上方开设第一过孔。其中,主要通过光刻工艺制备获得第一过孔。
S60、在所述第一绝缘层6上形成像素电极3,所述像素电极3通过所述第一过孔电性连接到所述薄膜晶体管2。其中,首先是通过沉积工艺在第一绝缘层6上形成像素电极3的薄膜层,然后再通过光刻工艺获得图形化的像素电极3。
S70、在具有像素电极3的第一绝缘层6上形成第二绝缘层8,并在所述第一绝缘层6和第二绝缘层8中对应于所述触控感应电极7的上方开设第二过孔。第二绝缘层8覆盖像素电极3和第一绝缘层6,并且通过光刻工艺制备获得第一过孔。
S80、在所述第二绝缘层8上形成金属连接线5,所述金属连接线5通过所述第二过孔电性连接到所述触控感应电极7。其中,首先是通过沉积工艺在第二绝缘层8上形成金属连接线5的薄膜层,然后再通过光刻工艺获得图形化的金属连接线5。
如图5中,本实施例还提供了一种液晶显示器,其包括如上所述的自电容式内嵌触摸屏100以及背光模组200,内嵌触摸屏100与背光模组200相对设置,所述背光模组200提供显示光源给所述内嵌触摸屏100,以使所述内嵌触摸屏100显示影像。
综上所述,本发明实施例中提供的自电容式内嵌触摸屏,内嵌触摸屏的阵列基板中设置有触摸屏结构,其中的触摸屏结构包括依次形成在平坦化层上的触控感应电极、第一绝缘层、第二绝缘层和金属连接线,由于触控感应电极相对于金属连接线具有更大的宽度和更小的厚度,沉积工艺时的高温使平坦化层放出的气体对触控感应电极与平坦化层之间的附着力影响较小,改善了现有技术中先制备金属连接线时附着力小的问题,提升了产品的品质,降低了生产成本。另外,第二绝缘层还隔离了金属连接线与像素电极,避免了金属连接线与像素电极之间发生短路。
需要说明的是,在本文中,诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来,而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下,由语句“包括一个……”限定的要素,并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上所述仅是本申请的具体实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本申请原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本申请的保护范围。

Claims (9)

1.一种自电容式内嵌触摸屏,包括阵列基板(30),所述阵列基板(30)包括玻璃基板(1)以及设置在玻璃基板(1)上的薄膜晶体管(2)和与薄膜晶体管(2)电性连接的像素电极(3),所述像素电极(3)与所述薄膜晶体管(2)之间设置有平坦化层(4),其特征在于,所述平坦化层(4)上还依次设置有透明的触控感应电极(7)、第一绝缘层(6)、第二绝缘层(8)以及金属连接线(5),所述金属连接线(5)通过设置于所述第一绝缘层(6)和第二绝缘层(8)中的过孔电性连接到所述触控感应电极(7);其中,所述第一绝缘层(6)延伸至所述平坦化层(4)与所述像素电极(3)之间,第二绝缘层(8)延伸至所述像素电极(3)上,所述像素电极(3)通过设置于所述第一绝缘层(6)和平坦化层(4)中的过孔电性连接到所述薄膜晶体管(2);
其中,所述触控感应电极(7)还被配置为公共电极,在一帧画面的显示时间内,所述触控感应电极(7)用于分时地传递公共电压和触摸扫描信号。
2.根据权利要求1所述的自电容式内嵌触摸屏,其特征在于,所述触控感应电极(7)和所述像素电极(3)的材料为ITO,所述平坦化层(4)的材料为有机材料,所述金属连接线(5)的材料为金属材料。
3.根据权利要求1所述的自电容式内嵌触摸屏,其特征在于,所述第一绝缘层(6)和所述第二绝缘层(8)的材料为SiNx、SiOx或SiNxOy
4.根据权利要求1所述的自电容式内嵌触摸屏,其特征在于,所述薄膜晶体管(2)包括源极(21)、漏极(22)、栅极(23)和有源层(24),所述有源层(24)连接于所述玻璃基板(1)上,所述源极(21)和漏极(22)同层设置且位于所述有源层(24)上方,所述栅极(23)位于所述源极(21)和漏极(22)上方;所述源极(21)和漏极(22)与所述有源层(24)之间设置有第三绝缘层(9),所述源极(21)和漏极(22)分别通过设置于所述第三绝缘层(9)中的过孔连接到所述有源层(24);所述源极(21)和漏极(22)与所述栅极(23)之间设置有第四绝缘层(10)。
5.根据权利要求4所述的自电容式内嵌触摸屏,其特征在于,所述有源层(24)与所述源极(21)、漏极(22)之间还设置有欧姆接触层(25)。
6.根据权利要求4所述的自电容式内嵌触摸屏,其特征在于,所述第三绝缘层(9)和所述第四绝缘层(10)的材料为SiNx、SiOx或SiNxOy
7.根据权利要求1所述的自电容式内嵌触摸屏,其特征在于,该自电容式内嵌触摸屏还包括与所述阵列基板(30)相对设置滤光基板40以及设置于所述阵列基板(30)和所述滤光基板(40)之间的液晶层(50)。
8.一种如权利要求1-7任一所述的自电容式内嵌触摸屏的制备方法,包括制备阵列基板(30)的步骤,其特征在于,所述阵列基板(30)的制备工艺包括:
S10、提供一玻璃基板(1)并在玻璃基板(1)上制备薄膜晶体管(2)阵列;
S20、在具有薄膜晶体管(2)阵列的玻璃基板(1)上形成一平坦化层(4);
S30、在所述平坦化层(4)上形成透明的触控感应电极(7);
S40、在具有触控感应电极(7)的平坦化层(4)上形成第一绝缘层(6);
S50、在所述第一绝缘层(6)和平坦化层(4)中对应于所述薄膜晶体管(2)的上方开设第一过孔;
S60、在所述第一绝缘层(6)上形成像素电极(3),所述像素电极(3)通过所述第一过孔电性连接到所述薄膜晶体管(2);
S70、在具有像素电极(3)的第一绝缘层(6)上形成第二绝缘层(8),并在所述第一绝缘层(6)和第二绝缘层(8)中对应于所述触控感应电极(7)的上方开设第二过孔;
S80、在所述第二绝缘层(8)上形成金属连接线(5),所述金属连接线(5)通过所述第二过孔电性连接到所述触控感应电极(7)。
9.一种液晶显示器,包括液晶显示屏(100)及背光模组(200),所述液晶显示屏(100)与所述背光模组(200)相对设置,所述背光模组(200)提供显示光源给所述液晶显示屏(100),以使所述液晶显示屏(100)显示影像,其特征在于,所述液晶显示屏(100)采用如权利要求1-7任一所述的自电容式内嵌触摸屏。
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