CN104298018B - 阵列基板及其制作方法、显示面板 - Google Patents
阵列基板及其制作方法、显示面板 Download PDFInfo
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Abstract
本发明公开了一种阵列基板及其制作方法、显示面板,涉及显示技术领域。所述阵列基板包括依次位于衬底基板上方的平坦层、第一电极层、绝缘层和第二电极层。所述第二电极层包括多个电极条,所述平坦层包括多个朝向所述第二电极层凸出的凸起,所述第一电极层的至少一部分形成在所述凸起上。较优地,所述平坦层在对应于相邻所述电极条之间的空隙位置有凸起设计。本发明通过在平坦层上设计凸起,以减小第一电极层与第二电极层中电极之间的垂直距离,达到增强水平电场强度,减弱垂直电场强度分布的效果,使显示面板能够在较低的驱动电压下达到较高的亮度。
Description
技术领域
本发明涉及显示技术领域,尤其涉及一种阵列基板及其制作方法、以及包括该阵列基板的显示面板。
背景技术
为了满足广大消费者对显示品质的追求,液晶显示面板的分辨率越来越高,从而导致产品的开口率越来越低,且功耗日益增加。
图1是现有阵列基板的结构示意图,在衬底基板1(这里的“衬底基板”包括薄膜晶体管阵列)上依次设置有平坦层2、第一电极层3、绝缘层4和第二电极层5。其中,第二电极层5包括多个电极条50。
现有高PPI(Pixels Per Inch,每英寸像素数)产品中使用的液晶7一般是正性液晶,正性液晶加电时趋于与电场线6平行排列,如图1中所示。目前,高PPI产品都希望液晶分子平行于衬底基板1排列,以提高光透过率。然而,在电场线6垂直的位置,比如电极条50中部以及相邻电极条50之间空隙的中部(图1中虚线框所示的位置),液晶分子垂直于衬底排列,该区域透光性能受到影响产生暗线。为了满足客户亮度的需要通常的做法是增加背光的亮度,因此导致了功耗的增加。
为了降低功耗并维持满意的亮度,一种方法是降低显示面板的驱动电压。模拟显示通过降低绝缘层4的厚度,以增大第一电极层3和第二电极层5之间的电场强度,可以降低驱动电压。但是绝缘层4的厚度每降低驱动电压仅可以降低0.5V,对于高PPI产品,绝缘层4的厚度本身已经非常小,通过降低绝缘层的厚度来实现降低驱动电压的范围非常有限。
因此,如何实现低功耗高透过率显示成为本领域亟待解决的技术问题。
发明内容
本发明的目的在于提供一种阵列基板及其制作方法、显示面板,以实现低功耗高透过率显示。
为解决上述技术问题,作为本发明的第一个方面,提供一种阵列基板,包括依次位于衬底基板上方的平坦层、第一电极层、绝缘层和第二电极层,所述第二电极层包括多个电极条,所述平坦层包括多个朝向所述第二电极层凸出的凸起,所述第一电极层的至少一部分形成在所述凸起上。
优选地,相邻的所述电极条之间具有空隙,所述凸起的位置对应于所述空隙的位置。
优选地,所述凸起的高度小于或等于所述绝缘层与所述电极条的厚度之和。
优选地,所述凸起的宽度小于所述空隙的宽度。
优选地,所述凸起在垂直于所述衬底基板的方向上的截面为梯形、矩形、三角形和圆弧形中的一种。
作为本发明的第二个方面,还提供一种显示面板,包括本发明所提供的上述阵列基板。
优选地,所述显示面板还包括与所述阵列基板对盒设置的对盒基板,以及填充在所述阵列基板和所述对盒基板之间的液晶,所述液晶为正性液晶或者负性液晶。
作为本发明的第三个方面,还提供一种阵列基板的制作方法,包括以下步骤:
形成包括多个凸起的平坦层;
在所述平坦层上形成第一电极层;
在所述第一电极层上形成绝缘层;
在所述绝缘层上形成包括多个电极条的第二电极层;
其中,所述凸起朝向所述第二电极层凸出,所述第一电极层的至少一部分形成在所述凸起上。
优选地,相邻的所述电极条之间具有空隙,所述凸起的位置对应于所述空隙的位置。
优选地,使用半阶色调掩膜板形成包括多个凸起的平坦层。
本发明通过在平坦层上设计凸起,以减小第一电极层与第二电极层中电极之间的垂直距离,达到增强水平电场强度,减弱垂直电场强度分布的效果,使显示面板能够在较低的驱动电压下达到较高的亮度。
附图说明
附图是用来提供对本发明的进一步理解,并且构成说明书的一部分,与下面的具体实施方式一起用于解释本发明,但并不构成对本发明的限制。
图1是现有技术中阵列基板的结构示意图;
图2是本发明实施例中提供的显示面板的结构示意图;
图3是驱动电压与光透光率的模拟曲线图;
图4a-图4d是本发明实施例中提供的阵列基板的制作过程示意图。
在附图中,1:衬底基板;2、12:平坦层;3、13:第一电极层;4、14:绝缘层;5、15:第二电极层;6、16:电场线;7:液晶;8:对盒基板;9:封框胶;20:凸起;50:电极条。
具体实施方式
以下结合附图对本发明的具体实施方式进行详细说明。应当理解的是,此处所描述的具体实施方式仅用于说明和解释本发明,并不用于限制本发明。
本发明首先提供一种阵列基板,如图2中所示,所述阵列基板包括依次位于衬底基板1(这里的“衬底基板”包括薄膜晶体管阵列)上方的平坦层12、第一电极层13、绝缘层14和第二电极层15。第二电极层15包括多个电极条50,平坦层12包括多个朝向第二电极层15凸出的凸起20,第一电极层13的至少一部分形成在凸起20上。
本发明对阵列基板上的平坦层12进行了改进设计,在平坦层12上制作了多个凸起20,那么在垂直于衬底基板1的方向上,位于凸起20上的第一电极层13的一部分与电极条50之间的距离缩短了,因此增大了第一电极层13与第二电极层15之间的水平电场强度,减弱了垂直电场影响的范围,在降低显示面板的驱动电压的同时,实现高亮度显示。
与现有技术相比,在相同的驱动电压下,本发明所提供的阵列基板中,位于凸起20上的第一电极层13的一部分与电极条50之间的水平距离可以做得很小,增大了水平电场强度,因此可以更好的驱动液晶分子翻转,即,在包括本发明所提供的阵列基板的显示面板中,以较小的驱动电压即可使液晶分子达到所需的翻转程度,从而降低了显示面板的功耗。
这里的第一电极层13可以是像素电极层,第二电极层15可以是公共电极层,第一电极层13与第二电极层15的位置可以互换,即第一电极层13也可以是公共电极层,第二电极层15也可以是像素电极层。
在图2中,第二电极层15包括多个电极条50,相邻的电极条50之间具有空隙,凸起20的位置对应于所述空隙的位置。本发明所提供的阵列基板适用于液晶为正性液晶的显示面板,也适用于液晶为负性液晶的显示面板。
如上文所述,由于正性液晶加电时趋于与电场线平行排列,导致液晶分子在电极条50的中部以及相邻电极条50之间空隙的中部垂直排列,使得相应位置的光线不能被透过产生暗线。本发明中,凸起20的位置与所述空隙的位置相对应,相当于在所述空隙的位置缩短了第一电极层13中的电极与电极条50之间的垂直距离,从而减弱了电场线16在垂直方向的分布,降低了液晶分子垂直排列的可能性,提高了光线在相邻电极条50之间空隙的中部的透过率,从而能够提升显示亮度,降低功耗。
另一方面,负性液晶是一种提高光透过率的有效手段,因为负性液晶在加电时趋于与电场方向垂直排列,受到垂直电场的影响很小。尤其针对高分辨率的产品,可以提升20~50%的光透过率。然而,在现有技术中,负性液晶显示面板达到最大亮度时需要很高的驱动电压(通常在6-7V),超出了常规驱动芯片的最大输出电压,即使在驱动芯片能承受的范围内尽量增大驱动电压,也很容易导致信赖性过程中出现问题。而当负性液晶显示面板与正性液晶显示面板的驱动电压相同时(约4.5-5V),其光透过率仅能提高5%,甚至更低。通常此时负性液晶显示面板的响应时间却比正性液晶显示面板的响应时间更长,以上两点是导致目前负性液晶显示面板难以量产的原因。
在包括本发明所提供的阵列基板的显示面板进行显示时,由于位于凸起20上的第一电极层13的一部分和第二电极层15中的电极条50之间的距离缩短,因此,与现有技术相比,在相同的驱动电压下,本发明所提供的阵列基板中第一电极层13和第二电极层15之间的电场强度相对较大。换言之,为了使得第一电极层13和第二电极层15之间达到预定的电场强度,本申请所提供的阵列基板只需较小的驱动电压。即,本发明所提供的阵列基板降低了负性液晶显示面板所需的驱动电压,从而使负性液晶显示面板的量产成为可能。
图3是驱动电压与光透光率的模拟曲线图,图中曲线a表示现有技术中的显示面板的驱动电压与光透光率的模拟曲线,曲线b表示本发明中的显示面板的驱动电压与光透光率的模拟曲线,现有技术中的显示面板以及本发明中的显示面板中使用的液晶均为正性液晶。
从图3中能够看出,本发明中与现有技术相比,在光透过率相同的情况下,曲线b比曲线a向左偏移了大约1V。即采用本发明所提供的阵列基板,显示面板达到最大亮度时所需的驱动电压可以降低1V左右。即对于负性液晶显示面板,只需要5V左右的驱动电压就能达到较低的响应时间和最大的显示亮度,实现低功耗高亮度显示。
在本发明中,凸起20的高度优选小于或等于绝缘层14与电极条50的厚度之和,即在图2所示的截面中,位于凸起20上的第一电极层13的一部分的高度不超出电极条50的高度。此外,凸起20的宽度优选小于相邻电极条50之间的空隙的宽度。这样不仅便于生产制作,而且能够维持显示面板的结构稳定性,避免生产过程中产生其它不良现象。
本发明中对凸起20的形状没有具体的限制,在垂直于衬底基板1的方向上,凸起20的截面可以是梯形、矩形、三角形、圆弧形等,多个凸起20也可以具有不同的形状。例如,在图2中所示的实施方式中,凸起20的截面为梯形。
本发明还提供了一种显示面板,包括本发明所提供的上述阵列基板。如图2中所示,所述显示面板还包括与所述阵列基板对盒设置的对盒基板8,以及填充在所述阵列基板和所述对盒基板8之间的液晶7。
本发明中,对盒基板8可以是设置有彩色滤光膜的彩膜基板,液晶7可以是正性液晶,也可以是负性液晶。如上所述,本发明能够降低负性液晶显示面板所需的驱动电压,可以使负性液晶显示面板在与正性液晶显示面板相同甚至更低的驱动电压下得到更高的亮度,同时也能降低响应时间,使负性液晶显示面板的量产成为现实。因此,本发明尤其适用于高PPI负性液晶显示面板。
本发明还提供了一种阵列基板的制作方法,包括以下步骤:
在形成有薄膜晶体管阵列的衬底基板上形成包括多个凸起的平坦层;
在所述平坦层上形成第一电极层;
在所述第一电极层上形成绝缘层;
在所述绝缘层上形成包括多个电极条的第二电极层;
其中,所述凸起朝向所述第二电极层凸出,所述第一电极层的至少一部分形成在所述凸起上。
本发明改进了平坦层的设计,在平坦层上制作了多个凸起,那么在垂直于衬底基板的方向上,位于凸起上的第一电极层的一部分与电极条之间的垂直距离缩短了,因此增大了第一电极层和第二电极层之间的电场强度,从而能够降低显示面板的驱动电压,实现低功耗显示。或者说,在驱动电压相同的情况下,包括本发明中阵列基板的显示面板能够达到更高的亮度。
进一步地,相邻的所述电极条之间具有空隙,所述凸起的位置对应于所述空隙的位置。
所述凸起的位置与所述空隙的位置相对应,相当于在所述空隙的位置缩短了第一电极层与第二电极层之间的垂直距离,从而减弱了电场线在垂直方向的分布,减少了液晶分子垂直排列的可能性。对于正性液晶,提高了光线在所述电极条的中部以及相邻电极条之间空隙的中部的透过率,能够提升显示亮度,降低功耗。对于负性液晶,能够降低其所需的驱动电压,使负性液晶显示面板的量产成为可能。
本发明中,使用半阶色调掩膜板来形成具有多个凸起的平坦层,通过调整半阶色调掩膜板的图案,就能够调整凸起的形状和高度等。
下面以一个具体的实施例来对本发明进行详细的阐述。图4a-图4d表示了本发明一种实施例提供的阵列基板的制作过程。制作过程中的具体步骤如下:
步骤一,利用半阶色调掩膜板在形成有薄膜晶体管阵列的衬底基板1上形成包括多个凸起20的平坦层12,如图4a所示。
步骤二,在平坦层12上通过镀膜、曝光、显影、刻蚀等工艺制作第一电极层13,如图4b所示。所述第一电极层13可以是像素电极层。
步骤三,在第一电极层13上通过气相沉积、曝光、显影、刻蚀等工艺制作绝缘层14,如图4c所示。
步骤四,在绝缘层14上通过镀膜、曝光、显影、刻蚀等工艺制作第二电极层15,如图4d所示。所述第二电极层15可以是公共电极层,第二电极层15包括多个电极条50。
之后,在制作完成的阵列基板上滴液晶,在对盒基板(或彩膜基板)上涂布封框胶,将所述阵列基板和所述对盒基板进行真空对盒和切割,得到单个显示面板。
本发明中,平坦层12具有凸起结构。凸起20的厚度可以是绝缘层14和电极条50厚度的总和,凸起20的宽度可以根据图1中暗线的宽度来决定。
本发明有效减小了位于凸起20上的第一电极层13的一部分和第二电极层15中的电极条50之间的垂直距离,增大了两者之间的电场强度,进而减小了显示面板所需的驱动电压,实现低功耗显示。本发明尤其适用于负性液晶显示面板,使其在较低的驱动电压下实现了高亮度的显示,使负性液晶显示面板的量产成为现实。
可以理解的是,以上实施方式仅仅是为了说明本发明的原理而采用的示例性实施方式,然而本发明并不局限于此。对于本领域内的普通技术人员而言,在不脱离本发明的精神和实质的情况下,可以做出各种变型和改进,这些变型和改进也视为本发明的保护范围。
Claims (7)
1.一种阵列基板,包括依次位于衬底基板上方的平坦层、第一电极层、绝缘层和第二电极层,所述第二电极层包括多个电极条,其特征在于,所述平坦层包括多个朝向所述第二电极层凸出的凸起,所述第一电极层的至少一部分形成在所述凸起上,相邻的所述电极条之间具有空隙,所述凸起的位置对应于所述空隙的位置,所述凸起的高度等于所述绝缘层与所述电极条的厚度之和。
2.根据权利要求1所述的阵列基板,其特征在于,所述凸起的宽度小于所述空隙的宽度。
3.根据权利要求1-2中任意一项所述的阵列基板,其特征在于,所述凸起在垂直于所述衬底基板的方向上的截面为梯形、矩形、三角形和圆弧形中的一种。
4.一种显示面板,其特征在于,包括权利要求1-3中任意一项所述的阵列基板。
5.根据权利要求4所述的显示面板,其特征在于,所述显示面板还包括与所述阵列基板对盒设置的对盒基板,以及填充在所述阵列基板和所述对盒基板之间的液晶,所述液晶为正性液晶或者负性液晶。
6.一种阵列基板的制作方法,其特征在于,包括以下步骤:
形成包括多个凸起的平坦层;
在所述平坦层上形成第一电极层;
在所述第一电极层上形成绝缘层;
在所述绝缘层上形成包括多个电极条的第二电极层;
其中,所述凸起朝向所述第二电极层凸出,所述第一电极层的至少一部分形成在所述凸起上,相邻的所述电极条之间具有空隙,所述凸起的位置对应于所述空隙的位置,所述凸起的高度等于所述绝缘层与所述电极条的厚度之和。
7.根据权利要求6所述的制作方法,其特征在于,使用半阶色调掩膜板形成包括多个凸起的平坦层。
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