CN106502454B - 触控显示面板及其制造方法 - Google Patents

触控显示面板及其制造方法 Download PDF

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CN106502454B
CN106502454B CN201610919791.7A CN201610919791A CN106502454B CN 106502454 B CN106502454 B CN 106502454B CN 201610919791 A CN201610919791 A CN 201610919791A CN 106502454 B CN106502454 B CN 106502454B
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electrode
touch
display panel
layer
control display
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CN106502454A (zh
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宋斌斌
邱峰青
龚立伟
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InfoVision Optoelectronics Kunshan Co Ltd
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    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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Abstract

一种触控显示面板,由下而上依次包括TFT基板、液晶层、CF基板、触控感测层、及偏光片,触控感测层包括同层设置的第一电极、第二电极、及第三电极,第一电极和第二电极分别为多个水平间隔设置的条状电极且二者走向垂直,第一电极被第二电极间隔,间隔的第一电极通过架桥电性连接,第三电极设置于第一电极与第二电极之间的空白位置,第一电极、第二电极及第三电极电性绝缘,第一电极和第二电极之间形成水平方向电场。本发明还提供一种触控显示面板制造方法。上述触控显示面板,由于第一电极和第二电极为同层设置,使得干涉现象明显减弱,提升显示效果;第三电极的设置,降低触控感测层电容,触控感测层图形均匀,透光性均一,提升产品品质。

Description

触控显示面板及其制造方法
技术领域
本发明涉及触控显示技术领域,特别涉及一种触控显示面板及其制造方法。
背景技术
随着信息时代的发展及生活节奏的加快,触控技术由于其人性化设计及简单快捷的输入等特点,已经逐渐取代传统的鼠标和键盘,广泛的应用到各式各样的电子产品中,其中,电容式触摸屏由于其具有反应速度快,灵敏度高,可靠度佳以及耐用度高等优点而被广为使用。电容式触摸屏主要包括保护盖板(Cover Lens)和触控感测层(Touch Sensor),其感应原理是以电压作用在屏幕感应区的四个角落并且形成一固定电场,当手指触碰时,人体和透明电极之间产生电容变化,可令电场引发电流,通过控制器测定,根据电流距四个角落比例的不同,即可计算出接触位置。
根据触控感测层在显示面板中的设置方式不同,触控显示面板分为外挂式、单玻璃触控式(One Glass Solution,OGS)、内嵌式(In-Cell)和外嵌式(On-Cell)等结构。外挂式触控显示面板由于触摸屏与显示面板是相互独立设置,产品厚度较大,不能满足一些掌上设备和便携式设备的超薄要求。OGS触控显示面板是将触控感测层与保护玻璃整合在一起再通过光学胶贴合在显示面板上,具有触控灵敏度高等优点,是目前的主流触控结构之一,主要的缺点是强度不好易碎。In-Cell触控显示面板是将触控感测层集成到显示面板的彩色滤光片 (Color Filter,CF)基板内侧,但In-Cell触控显示面板因结构、制程均比较复杂而导致其生产良率较低。On-Cell触控显示面板是将触控感测层设置在显示面板的CF基板外侧,也是目前的主流触控结构之一,通常,On-Cell触控显示面板的触控感测层是嵌入设置在CF基板和偏光片之间。
图1是现有的触控显示面板的剖面结构示意图,图2是图1中触控感测层的电场分布示意图,图3是现有的触控显示面板的触控感测层的平面结构示意图。参见图1至图3所示,现有的触控显示面板20由下而上依次包括薄膜晶体管(Thin-Film Transistor,TFT)基板 21、液晶(LC)层22、彩色滤光(Color Filter,CF)基板23、触控感测层24、偏光片(Polarizer, POL)25、以及保护盖板26,其中触控感测层24的发射电极(TX电极)241和接收电极(RX 电极)242采用不同层设置,发射电极241和接收电极242之间形成竖直方向的电场,发射电极241和接收电极242采用多个水平间隔条状的金属网格电极且二者走向垂直交叉。虽然,金属网格电极具有较小的电阻值以及良好的透光性。但是,由于发射电极241和接收电极242 不同层设置,在光通过发射电极241所在层和接收电极242所在层时分别发生干涉现象,并加强了整体的干涉现象,产生严重的摩尔条纹,影响面板显示效果;另外,触控感测层24存在无发射电极241或接收电极242所覆盖的裸露区域243,使得触控感测层24图形不均匀,透光不同,造成外观差异,影响产品品质。
发明内容
鉴于上述状况,有必要提供一种结构简单、设计合理的触控显示面板,其可以有效减弱光通过触控感测层时的干涉现象,同时使得触控感测层的图形均匀、透光均一。
本发明提供一种触控显示面板,由下而上依次包括TFT基板、液晶层、CF基板、触控感测层、及偏光片,所述触控感测层包括同层设置的第一电极、第二电极、以及第三电极,所述第一电极和所述第二电极分别为多个水平间隔设置的条状电极且二者走向互相垂直,所述第一电极被所述第二电极间隔,间隔的所述第一电极通过架桥电性连接,所述第三电极设置于所述第一电极与所述第二电极之间的空白位置,所述第一电极、所述第二电极及所述第三电极电性绝缘,所述第一电极和所述第二电极之间形成水平方向电场。
进一步地,所述架桥电性连接于相邻的两所述第一电极之间。
进一步地,所述第一电极为网格结构。
进一步地,所述网格结构包括多条相互交叉的导电线、多个由所述导电线相互交叉所形成的网格、以及多个分别位于所述导电线交叉处的节点。
进一步地,所述节点为环形结构。
进一步地,所述网格结构的材料为Al和Mo结合的金属材料。
进一步地,所述架桥为导电直线、导电折线、或由导电直线和/或导电折线而形成的导电网格其中之一。
进一步地,所述架桥与所述节点电性连接。
进一步地,所述第二电极和所述第三电极分别采用所述网格结构。
本发明还提供一种触控显示面板制造方法,所述制造方法包括如下步骤:提供TFT基板、液晶层、及CF基板组装成触控显示面板;在所述CF基板远离所述液晶层的一侧表面制作同层设置的触控感测层的第一电极、第二电极、以及第三电极;在所述第一电极、所述第二电极、及所述第三电极上方或下方制作有绝缘层;在所述绝缘层的上方或下方制作架桥,且所述架桥位于相邻的两第所述一电极之间以将相邻的两所述第一电极电性连接;以及在所述触控感测层上方依次制作有偏光片和保护盖板,形成触控显示面板。
本发明实施例的技术方案带来的有益效果是:上述触控显示面板,由于触控感测层的第一电极和第二电极为同层设置,使得光通过时的干涉现象明显减弱,提升面板显示效果;另外,第三电极的设置,降低了触控感测层的电容,同时使得触控感测层图形均匀,透光性均一,提升产品外观品质。
附图说明
图1是现有的触控显示面板的剖面结构示意图;
图2是图1中的触控感测层的电场分布示意图;
图3是现有的触控显示面板的触控感测层的平面结构示意图;
图4是本发明实施例中的触控显示面板的剖面结构示意图;
图5是本发明实施例中的触控显示面板的触控感测层的平面结构示意图;
图6是图4中的触控感测层的电场分布示意图;
图7是本发明实施例的第一种架桥的结构示意图;
图8是图7的局部放大图;
图9是本发明实施例的第二种架桥的结构示意图;
图10是图9的局部放大图;
图11是本发明实施例的第三种架桥的结构示意图;
图12是图11的局部放大图;以及
图13是本发明实施例中的触控显示面板制造方法的流程图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚,下面将结合附图对本发明实施例作进一步地详细描述。
在本发明说明书中所称的方位“上”及“下”仅用以表示相对的方位关系;对于本说明书的附图而言,触控显示面板10的上方较接近观看者,而下方则较远离观看者。
图4是本发明实施例中的触控显示面板的剖面结构示意图,具体地,请参见图4,本发明的触控显示面板10由下而上依次包括TFT基板11、液晶层12、CF基板13、触控感测层14、偏光片15、以及保护盖板16,上述各层之间可以根据各种应用或功能需求而***其他额外的层。
具体地,TFT基板11上设置有电极对(Electrode Pair),电极对包括像素电极(Pixel Electrode)和对向电极(Common Electrode),两者间产生一侧向水平电场以控制液晶层12 中的液晶的旋转。CF基板13为透明基板,其可以为玻璃、高分子塑胶材料(例如聚碳酸酯 (Polycarbonate,PC)、聚氯乙烯(Polyvinylchloride,PVC))或其他透明的材质。触控感测层14设置于CF基板13上方,触控感测层14上方依次设置有偏光片15和保护盖板16,偏光片15可以采用聚乙烯醇(Polyvinyl Alcohol,PVA)或其他材质,保护盖板16为全透明玻璃或其他透明材质。
图5是本发明实施例中的触控显示面板的触控感测层的平面结构示意图,图6是图4中触控感测层的电场分布示意图,图7是本发明实施例的第一种架桥的结构示意图,图8是图 7的局部放大图,图9是本发明实施例的第二种架桥的结构示意图,图10是图9的局部放大图,图11是本发明实施例的第三种架桥的结构示意图,图12是图11的局部放大图。参见图4至图12所示,触控感测层14包括第一电极142、第二电极144、第三电极146、以及架桥 143。
第一电极142、第二电极144、及第三电极146采用同层设计但电性绝缘,第一电极142、第二电极144之间形成水平方向电场而不同于现有技中所形成的竖直方向电场。第一电极 142、第二电极144相互电性绝缘,电性绝缘方式可以是设置绝缘层或彼此隔开,但不限于此。第一电极142为接收电极、第二电极144为发射电极;或第一电极142为发射电极、第二电极144为接收电极。
第一电极142为多个水平间隔设置的条状电极,且该条状电极之间互相独立;第二电极144为多个水平间隔设置的条状电极,且该条状电极之间互相独立。第一电极142的走向和第二电极144的走向互相垂直,在本实施例中,第二电极144的走向沿X轴方向,第一电极 142的走向沿Y轴方向。由于第一电极142、第二电极144同层设计,第二电极144为整条不间断,而第一电极142则是被第二电极144间隔开,且间隔的第一电极142之间通过架桥143电性连接。另外,由于第一电极142和第二电极144同层设置,光通过时仅发生单层干涉,其干涉现象较现有技术中发射电极与接收电极不同层设置而发生双层干涉有明显减弱,面板显示效果进一步提升。
请参见图8、图10、及图12所示,第一电极142为网格结构,网格结构包括多条相互交叉的导电线1423、多个由导电线1423相互交叉所形成的网格1424、以及多个分别位于导电线1423交叉处的节点1425。在本实施例中,网格结构的材料为Al(铝)和Mo(钼)叠层结构的金属材料,具体地,该金属材料为材料可以是Mo+Al或Mo+Al+Mo,其中Al为主要导电材料,Al导电性好、来源广、成本低廉,而Mo可以保护Al不被氧化同时Mo易于和玻璃及绝缘层结合而不易脱落。在其他实施例中,网格结构的材料也可以为透明氧化物如ITO、银纳米、石墨烯等。网格1424的形状为菱形,每一网格1424的四条边分别为对应的四条导电线1423的部分,每个网格1424的四个顶点分别与对应的四个节点1425相接。节点1425为环形结构如圆环形结构、方环形结构、多边形环形结构等。
由于节点1425为环形结构,而环形结构的中间是空的可以透光,且环形结构的宽度与导电线1423的宽度一致,因此节点1425处的面阻抗和导电线1423上的面阻抗相差无几,相较于现有技术的实心节点,该节点1425的面阻抗降低,降低了经过第一电极142信号的衰减程度,从而第一电极142(网格结构)的线宽可以进一步减小,同时使得第一电极142的透光性更好。实验证明,在相同的条件下,如第一电极142的网格1424为菱形,每个网格1424 的锐角内角为58°、短对角线的长度为100um~1000um之间、线宽均为4um、且背光亮度为 366.4cd/m2,采用本发明网格结构的触控面板的白画面亮度为340.5cd/m2,而现有技术中的实心节点网格结构的触控面板的白画面亮度为315.1cd/m2,故本实施例所提供的网格结构透光性更好。第一电极142线宽小于或者等于4um,线宽越小,透光性更佳。不计第一电极142 的每一网格1424的面积因导电线1423的宽度减少而增加,每一节点1425的内圈面积也明显增大,具体地,例如线宽为4um时,假设每一节点1425的内圈面积为4um*4um,当线宽减少为2.5um时,每一节点1425的内圈面积便增加至5.5um*5.5um。由于节点1425的内圈面积与每一网格1424的面积都因线宽的减少而增大,也就是说,光线得以透过的面积增大,因此,线宽小的第一电极142的透光性会更佳,摩尔条纹的影响会更小。
请参见图7至图12所示,架桥143用于将间隔的第一电极142电性连接。架桥143可以导电直线、导电折线、以及由导电直线和/或导电折线而形成的导电网格等。具体地,当架桥 143为导电直线或导电折线,相邻的两第一电极142分别通过导电直线或导电折线将两第一电极142相靠近的节点1425电性连接;当架桥143为由导电直线和/或导电折线形成的导电网格,相邻的两第一电极142通过导电网格两端的导电线将两第一电极142相靠近的节点1425 电性连接。上述架桥143与节点1425之间连接为架桥143的端部直接插接固定于节点1425 中,连接处的材料结合能力好,避免了易脱落问题,连接方式更方便、导电性能更好,产品生产良率高,进而提升了产品质量。
图5,第二电极144亦为网格结构,第二电极144的结构与第一电极142的第一电极本体1422的结构相同,此处不再累述。第一电极142的宽部宽度D1为2mm,第一电极142的窄部宽度D2为1mm,第二电极144的宽部宽度D3为2mm,第二电极144的窄部宽度D4为1mm,架桥143的边长与第一电极142的窄部宽度D2及第二电极144的窄部宽度D4相同,架桥143 部分为1mm×1mm的正方形。
第三电极146设置于第一电极142与第二电极144之间的空白位置,第三电极146同第二电极144一样也采用网格结构电极,第三电极146的作用是使得触控感测层14图形均匀,避免外观差异,透光性均一,提升产品外观品质,同时降低了触控感测层14的电容。第一电极142、第二电极144、以及第三电极146具有规则的区域划分。第三电极146与第一电极142、第二电极144采用同层设计,且相互电气绝缘,电气绝缘方式可以是设置绝缘层。
第一电极142、第二电极144、及第三电极146使用同层金属网格工艺分区块设计,并架桥143实现间隔的第一电极142间的电性连接,一方面避免了第一电极142、第二电极144 的多层重叠设计而存在的材料浪费,另一方面使用架桥143的金属连接工艺,连接处的材料结合能力好,可避免了架桥易脱落问题。
图13是本发明实施例中的触控显示面板制造方法的流程图,参见图13所示,本发明实施例中的触控显示面板制造方法包括如下步骤:
S201:TFT基板11、液晶层12、及CF基板13组装成触控显示面板,液晶层12夹设于TFT基板11和CF基板13之间。
S202:在CF基板13远离液晶层12的一侧表面通过黄光工艺制作同层设置的非电气导通的触控感测层14的第一电极142、第二电极144、以及第三电极146;
S203:在第一电极142、第二电极144、以及第三电极146上方或下方制作有绝缘层;
S204:在绝缘层的上方或下方制作架桥143,且架桥143位于相邻的两第一电极142之间以将相邻的两第一电极142电性连接;以及
S205:在触控感测层14上方依次制作偏光片15和保护盖板16,形成触控显示面板10。
上述黄光工艺,包括镀金属、上光阻、曝光、蚀刻、去光阻等。
本发明实施例的技术方案带来的有益效果是:上述触控显示面板10,由于触控感测层14 的第一电极142和第二电极144为同层设置,使得光通过时的干涉现象明显减弱,提升面板显示效果;另外,第三电极146的设置,降低了触控感测层14的电容,同时使得触控感测层 14图形均匀,透光性均一,提升产品外观品质。
以上所述,仅是本发明的较佳实施例而已,并非对本发明作任何形式上的限制,虽然本发明已以较佳实施例揭露如上,然而并非用以限定本发明,任何熟悉本专业的技术人员,在不脱离本发明技术方案范围内,当可利用上述揭示的技术内容作出些许更动或修饰为等同变化的等效实施例,但凡是未脱离本发明技术方案内容,依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰,均仍属于本发明技术方案的范围内。

Claims (4)

1.一种触控显示面板(10),由下而上依次包括TFT基板(11)、液晶层(12)、CF基板(13)、触控感测层(14)及偏光片(15),其特征在于,所述触控感测层(14)包括同层设置的第一电极(142)、第二电极(144)及第三电极(146),所述第一电极(142)和所述第二电极(144)分别为多个水平间隔设置的条状电极且二者走向互相垂直,所述第一电极(142)被所述第二电极(144)间隔,间隔的所述第一电极(142)通过架桥(143)电性连接,所述架桥(143)电性连接于相邻的两所述第一电极(142)之间,所述第三电极(146)设置于所述第一电极(142)与所述第二电极(144)之间的空白位置,所述第一电极(142)、所述第二电极(144)及所述第三电极(146)电性绝缘,所述第一电极(142)和所述第二电极(144)之间形成水平方向电场,所述第一电极(142)为网格结构,所述网格结构包括多条相互交叉的导电线(1423)、多个由所述导电线(1423)相互交叉所形成的网格(1424)以及多个分别位于所述导电线(1423)交叉处的节点(1425),所述节点(1425)为环形结构,所述环形结构的中间是空的,相邻的两所述第一电极(142)通过所述架桥(143)将两所述第一电极(142)相靠近的节点(1425)电性连接,所述架桥(143)与所述节点(1425)之间的连接为所述架桥(143)的端部直接插接固定于所述节点(1425)中。
2.如权利要求1所述的触控显示面板(10),其特征在于:所述网格结构的材料为Al和Mo结合的金属材料。
3.如权利要求1所述的触控显示面板(10),其特征在于:所述架桥(143)为导电直线、导电折线、或由导电直线和/或导电折线而形成的导电网格其中之一。
4.如权利要求1所述的触控显示面板(10),其特征在于:所述第二电极(144)和所述第三电极(146)分别采用所述网格结构。
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