CN103064208B - 一种聚合物稳定垂直配向液晶显示面板及液晶显示器 - Google Patents
一种聚合物稳定垂直配向液晶显示面板及液晶显示器 Download PDFInfo
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Abstract
本发明提供一种聚合物稳定垂直配向液晶显示面板,其包含第一基板、第二基板、夹于两基板之间的液晶层,以及将液晶封于两基板内的边框胶材,所述液晶层材料包含:负型液晶材料,稳定剂及在紫外光照射下可发生聚合反应的反应性单体;所述边框胶材包括:环氧树脂、硬化剂、甲基丙稀酸酯树脂或丙稀酸酯树脂、光引发剂、填料以及硅烷偶联剂。本发明相应提供一种液晶显示器。实施本发明实施例,可以防止边框胶材中的甲基丙稀酸酯树脂或丙稀酸酯树脂被液晶介质所溶出,从而可以避免在边框附近形成过大的bump颗粒,从而减少边框附近的漏光现象,提高了产品良率。
Description
技术领域
本发明涉及液晶显示技术,尤其涉及一种聚合物稳定垂直配向液晶显示面板及液晶显示器。
背景技术
TN(Twisted nematic,扭曲向列型)或STN(Super twisted nematic,超扭曲向列型)液晶显示器所用的液晶为正型液晶,未加电时液晶分子长轴平行于基板表面。基板表面液晶分子的排列方向由配向层(Alignment layer,材质通常为Polyimide)的摩擦方向(Rubbing direction)决定,两基板表面配向方向垂直,所以从一个基板表面到另一个基板表面,液晶层的分子呈连续扭转排列状态。当施加电压之后,液晶分子的长轴将倾向于沿电场的方向排列。TN/STN型液晶显示器的缺点是可视角小,在大视角下的亮度差异和色差严重,需要通过补偿膜对此进行改善,从而提高了显示器的制造成本。
MVA(Multi-domain vertical alignment,多象限垂直配向型)TFT-LCD很好的解决了TN/STN显示器视角限制的问题,它采用负型液晶与垂直配向膜材料。未施加电压时,液晶分子长轴均垂直于基板表面,施加电压会使液晶分子倾倒,液晶分子长轴倾向于沿垂直电场方向排列。为了解决视角问题,一个亚像素被分成多个区域,使液晶分子朝不同的方向倾倒,让显示器从不同的方向看到的效果趋于一致。在一个亚像素内使不同区域的液晶分子导向不同的方向有多种方法。第一种是通过曝光显影的办法在LCD的上下基板制作出Bump(隆起物),使Bump周围的液晶分子产生一定的预倾角,引导液晶分子朝固定方向倾倒;第二种是在上下基板上形成具有一定图案的ITO(Indium Tin Oxide, 氧化铟锡)像素电极,由此产生的电场具有一定的倾斜角度,从而控制不同区域的液晶分子的导向,此技术被称为PVA(Patterned vertical alignment,垂直取向构型)技术;第三种是在LCD基板的TFT侧形成ITO slit(裂缝),另一侧为Full ITO,在液晶介质中添加可聚合的monomer(单体),先通过电场使液晶分子倾倒,同时用紫外光照射面板使monomer聚合形成具有引导液晶分子倾倒的聚合物颗粒,沉积在基板表面起到配向的作用,这种技术成为PSVA(Polymer stabilized vertical alignment,聚合物稳定垂直对齐)技术。
PSVA技术中聚合物bump的形成过程为一相分离过程,monomer未聚合之前为小分子,与液晶介质具有较好的相容性,制程过程中需要采用紫外光源对面板进行照射,monomer在紫外光照射下发生聚合反应,形成高分子时便从液晶介质中分离出来,形成不溶于液晶介质的聚合物颗粒,此即为具有配向作用的聚合物bump。
然而,目前所采用的边框胶多为复合型的固化方式,含有需要紫外光固化的甲基丙烯酸酯类单体与需要热固化的环氧树脂,所以需要先进行紫外光照射使其中甲基丙烯酸酯类树脂发生聚合反应,发生交联固化反应,再进行加热高温固化,使胶材中的另外一部分环氧树脂发生交联反应,提高框胶与玻璃基板的粘接力,使两片玻璃基板紧密结合,阻止液晶外溢,同时阻止空气中的水汽和氧气进入液晶盒内部。
由于边框胶中的甲基丙烯酸酯类单体与液晶中可聚合单体monomer具有十分相似的结构,所以在面板制造过程中边框胶中的部分甲基丙烯酸酯类单体有可能被液晶溶出,在紫外光照射下参与聚合反应,在面板四周靠近边框胶材的附近位置往往易形成较大颗粒的bump,产生在暗态下可见的亮点,使PSVA面板四周出现漏光的现象。由此可见PSVA技术中所用的边框胶材还有待进一步改进。
发明内容
本发明的所要解决的技术问题在于,提供一种液晶显示面板以及相应的液晶显示器,通过对液晶材料与边框胶材的合理搭配,可以防止边框胶材中的甲基丙稀酸酯树脂或丙稀酸酯树脂被液晶溶出,参与聚合反应,防止形成过大的bump颗粒,从而减少边框胶附件的漏光现象。
为解决上述技术问题,本发明实施例提供一种聚合物稳定垂直配向液晶显示面板,其包含第一基板、第二基板、夹于两基板之间的液晶层,以及将液晶封于两基板内的边框胶材,其中:
所述液晶层材料包含:负型液晶材料,稳定剂及在紫外光照射下可发生聚合反应的反应性单体;其中,所述反应性单体按重量份占液晶介质组合物的0.1%-1%,所述反应性单体至少包含一种或多种如结构通式1至结构通式4所描述的可聚合基单体:
结构通式1: ;
结构通式2: ;
结构通式3:;
结构通式4:;
其中,结构通式1-4中的P表示聚合基团,可以为以下结构之一:甲基丙烯酸酯基、丙烯酸酯基、乙烯基、乙烯氧基、环氧基;液晶介质组合物中所含的一种或多种如结构通式1至结构通式4所描述的可聚合基单体中至少有一个聚合基团P为丙烯酸酯基,且每个所述可聚合基单体的分子式小于500;
所述的边框胶材包含:
环氧树脂;
硬化剂;
用于进行紫外线固化的甲基丙稀酸酯树脂或丙稀酸酯树脂,所述甲基丙稀酸酯树脂或丙稀酸酯树脂的分子量大于等于500;
光引发剂;
填料;以及
硅烷偶联剂;
其中,所述硅烷偶联剂选自于如下的至少一种材料:
、
、
、
、
、及
。
其中,所述环氧树脂材料包含有含芳环环氧树脂或/及不含芳环氧树脂。
其中,所述环氧树脂材料包含有下述至少一种材料:
双酚A型环氧树脂、双酚F型环氧树脂、双酚S型环氧树脂、酚醛型环氧树脂、联苯型环氧树脂、含有氧化环己烯结构的环氧树脂或含有氧化环戊烯结构的环氧树脂。
其中,所述硬化剂为多胺类硬化剂以及酸酐类硬化剂中一种或多种。
其中,所述填料选自于如下无机填料:二氧化硅、氧化铝、氧化锌、氧化钛、氧化镁、硫酸钙、氮化铝、氮化硅。
相应地,本发明实施例的另一方面,提供一种聚合物稳定垂直配向液晶显示器,其包含前述的液晶显示面板。
实施本发明实施例,具有如下的有益效果:
本发明实施例提供的边框材料中所采用的甲基丙稀酸酯树脂或丙稀酸酯树脂其分子量大于500,而所选的液晶材料包含至少一种负型液晶分子材料和一种或多种以上可在紫外光照射下反应的可聚合单体,该可聚合单体的分子量小于500;由于边框胶材中的甲基丙稀酸酯树脂或丙稀酸酯树脂的分子量远大于液晶介质中所采用的可聚合单体的分子量,故其与液晶介质中的可聚合单体具有明显的差异性,由于可以防止边框材料中的甲基丙稀酸酯树脂或丙稀酸酯树脂被液晶介质所溶出,从而可以避免在边框附近形成过大的bump颗粒,从而减少边框附近的漏光现象。
具体实施方式
如图1所示,示出了本发明的一种聚合物稳定垂直配向液晶显示面板的示意图,该液晶显示面板包括:第一基板1、第二基板2、夹于两基板之间的液晶层3,以及将液晶封于两基板内的边框胶材4。其中,在第一基板1与第二基板2相向侧进一步设置有ITO电极5。液晶层中至少包含有液晶分子30,以及可聚合单体,在ITO电极5连通的情形下,该可聚合单体在第一基板1及第二基板2上形成Bump(隆起物)31,其中,该液晶层中的可聚合单体的分子量小于500,其中所述可聚合单体选自如下至少一种结构通式:
结构通式1: ;
结构通式2: ;
结构通式3:;
结构通式4:;
其中,结构通式1-4中的P表示聚合基团,可以为以下结构之一:甲基丙烯酸酯基、丙烯酸酯基、乙烯基、乙烯氧基、环氧基;液晶介质组合物中所含的一种或多种如结构通式1至结构通式4所描述的可聚合基单体中至少有一个聚合基团P为丙烯酸酯基。
进一步地,所述第一基板由玻璃或透明塑料板为基材,其上包含TFT有源驱动矩阵,周边电路,配向层材料等;所述第二基板由玻璃或透明塑料板为基材,其上包含滤色镜片(Color filter)、黑色矩阵片(Black matrix)、柱状隔垫物(Photo spacer)以及配向层材料等。
其中,边框胶材4至少包含如下的组份:
环氧树脂,20%~60%重量份;
硬化剂,5%~50%重量份;
用于进行紫外线固化的甲基丙稀酸酯树脂或丙稀酸酯树脂,20%~60%重量份;
光引发剂,0.1%~1%重量份;
填料,5%~35%重量份;以及
硅烷偶联剂。
其中,环氧树脂,占框胶材总重量比重为20%-60%,环氧树脂材料可由一种或多种不同结构环氧树脂的组合组成,其选用结构可有以下结构通式进行表示,但材料选于但不限于以下材料:含芳环环氧树脂包括双酚A型环氧树脂、双酚F型环氧树脂、双酚S型环氧树脂、酚醛型环氧树脂(如苯酚酚醛型环氧树脂、甲酚酚醛环氧树脂)、联苯型环氧树脂等。含芳环环氧树脂在其分子结构中含有一个或一个以上的环氧基团,树脂的环氧当量可进行适当优选。不含芳环环氧树脂是分子结构中不含芳香环结构的环氧树脂,它们通常含有环变形的环氧基团,如含有氧化环己烯结构或氧化环戊烯结构的环氧树脂。
固化剂,即环氧树脂硬化剂,占框胶材总重量比重的5%-50%,可由一种或多种组合物构成,可以为多胺类硬化剂以及酸酐类硬化剂中优选一种或多种进行组合。
甲基丙烯酸树脂或丙烯酸树脂,为一类含有甲基丙烯酸酯基团或丙烯酸酯基团结构的有机树脂材料,可由一种或多种不同树脂组合物构成,其平均分子量大于500,其占框胶材总重量比重的20%-60%。
光引发剂,含量占框胶比重为0.1%~1%,为一类能够吸收波长小于380nm紫外光并能引发聚合反应的紫外光(UV)敏感物质,例如Ciba公司的IRGACURE 1173、651等型号的光引发剂,其可由一种或多种组成。
填料,其占框胶材比重的5%-35%,选于但不限于以下无机填料:如二氧化硅、氧化铝、氧化锌、氧化钛、氧化镁、硫酸钙、氮化铝、氮化硅等。
硅烷偶联剂,占框胶材比重的0.05%-5%,选于但不限于以下几种材料:
,,,,,。
相应地,本发明实施例的提供一种聚合物稳定垂直配向液晶显示器,包括前述图1所描述的液晶显示面板。
通常来说,同一类物质在另外介质中的溶解性会随其分子量的增大而下降,本发明的实施例通过采用较大分子量的甲基丙稀酸酯树脂或丙稀酸酯树脂作为边框胶材中的紫外线固化树脂,而所选的液晶材料包含至少一种负型液晶分子材料和一种或多种以上可在紫外光照射下反应的可聚合单体,该可聚合单体的分子量小于500;由于边框胶材中的甲基丙稀酸酯树脂或丙稀酸酯树脂的分子量远大于液晶介质中所采用的可聚合单体的分子量,故其与液晶介质中的可聚合单体具有明显的差异性,由于可以防止边框材料中的甲基丙稀酸酯树脂或丙稀酸酯树脂被液晶介质所溶出,从而可以避免在边框附近形成过大的bump颗粒,从而减少边框附近的漏光现象,提高了液晶面板的良品率。
以上所揭露的仅为本发明较佳实施例而已,当然不能以此来限定本发明之权利范围,因此等同变化,仍属本发明所涵盖的范围。
Claims (6)
1.一种聚合物稳定垂直配向液晶显示面板,其包含第一基板、第二基板、夹于两基板之间的液晶层,以及将液晶封于两基板内的边框胶材,其特征在于,其中:
所述液晶层材料包含:负型液晶材料,稳定剂及在紫外光照射下可发生聚合反应的反应性单体;其中,所述反应性单体按重量份占液晶介质组合物的0.1%-1%,所述反应性单体至少包含一种或多种如结构通式1至结构通式4所描述的可聚合基单体:
结构通式1: ;
结构通式2: ;
结构通式3:;
结构通式4:;
其中,结构通式1-4中的P表示聚合基团,可以为以下结构之一:甲基丙烯酸酯基、丙烯酸酯基、乙烯基、乙烯氧基、环氧基;液晶介质组合物中所含的一种或多种如结构通式1至结构通式4所描述的可聚合基单体中至少有一个聚合基团P为丙烯酸酯基,且每个所述可聚合基单体的分子式小于500;
所述的边框胶材包含:
环氧树脂;
硬化剂;
用于进行紫外线固化的甲基丙稀酸酯树脂或丙稀酸酯树脂,所述甲基丙稀酸酯树脂或丙稀酸酯树脂的分子量大于等于500;
光引发剂;
填料;以及
硅烷偶联剂;
其中,所述硅烷偶联剂选自于如下的至少一种材料:
、
、
、
、
、及
。
2.如权利要求1所述的聚合物稳定垂直配向液晶显示面板,其特征在于,所述环氧树脂材料包含有含芳环环氧树脂或/及不含芳环氧树脂。
3.如权利要求1所述的聚合物稳定垂直配向液晶显示面板,其特征在于,所述环氧树脂材料包含有下述至少一种材料:
双酚A型环氧树脂、双酚F型环氧树脂、双酚S型环氧树脂、酚醛型环氧树脂、联苯型环氧树脂、含有氧化环己烯结构的环氧树脂或含有氧化环戊烯结构的环氧树脂。
4.如权利要求3所述的聚合物稳定垂直配向液晶显示面板,其特征在于,所述硬化剂为多胺类硬化剂以及酸酐类硬化剂中一种或多种。
5.如权利要求4所述的聚合物稳定垂直配向液晶显示面板,其特征在于,所述填料选自于如下无机填料:二氧化硅、氧化铝、氧化锌、氧化钛、氧化镁、硫酸钙、氮化铝、氮化硅。
6.一种聚合物稳定垂直配向液晶显示器,其特征在于,包含如权利要求1至5任一项所述的液晶显示面板。
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CN103849322B (zh) * | 2014-02-19 | 2015-06-10 | 北京京东方光电科技有限公司 | 一种封框胶组合物、液晶显示面板 |
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CN105087021B (zh) * | 2015-06-18 | 2017-11-17 | 深圳市华星光电技术有限公司 | 一种液晶垂直取向剂、液晶显示元件以及液晶显示元件的制备方法 |
JP6470204B2 (ja) * | 2016-02-25 | 2019-02-13 | 富士フイルム株式会社 | 液晶表示パネルの製造方法 |
EP3644117A4 (en) * | 2017-08-11 | 2020-07-29 | Huawei Technologies Co., Ltd. | DISPLAY PANEL, PRODUCTION METHOD THEREFOR, DISPLAY DEVICE AND TERMINAL |
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CN108051956B (zh) * | 2017-12-28 | 2020-07-31 | 深圳市华星光电技术有限公司 | 液晶面板的制造方法、框胶及其制造方法 |
CN108048013A (zh) * | 2018-01-03 | 2018-05-18 | 京东方科技集团股份有限公司 | 封框胶及其制备方法、显示装置 |
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CN109375430A (zh) * | 2018-12-18 | 2019-02-22 | 深圳市华星光电半导体显示技术有限公司 | 一种柔性液晶显示面板及其制作方法 |
CN109946883B (zh) * | 2019-04-24 | 2020-10-27 | 深圳市华星光电技术有限公司 | 聚合物稳定垂直配向液晶显示面板及其制造方法 |
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