CN104593009A - 液晶组合物及其在液晶显示中的应用 - Google Patents
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Abstract
本发明涉及一种环丙基类负介电各向异性的液晶组合物。其包含a)至少一种或多种选自式Ⅰ-1、式Ⅰ-2化合物的化合物,b)至少一种或多种式Ⅱ化合物。其中参数具有权利要求1中所说明的含义,涉及其在电光显示器中,特别是在VA、FFS或IPS效应有源矩阵显示器中的用途,含有这些液晶介质的该类显示器,以及包含一种或多种选自式Ⅰ-1至式Ⅰ-3化合物和一种或多种式Ⅱ化合物的化合物的液晶介质的用途。
Description
技术领域
本发明属于液晶材料领域,涉及一种液晶组合物及其在液晶显示中的应用。
技术背景
薄膜晶体管液晶显示器(TFT-LCD)经历了漫长的基础研究阶段,在实现大生产、商业化之后,以其轻薄、环保、高性能等优点已经成为LCD应用中的主流产品:无论是小尺寸的手机屏、还是大尺寸的笔记本电脑(Notebook PC)或监视器(Monitor),以及大型化的液晶电视(LCD-TV),到处可见TFT-LCD的应用。
早期商用的TFT-LCD产品基本采用了TN显示模式,其最大问题是视角窄。随着产品尺寸的增加,特别是在TV领域的应用,具有广视野角特点的IPS显示模式、VA显示模式依次被开发出来并加以应用,尤其是基于VA显示模式的改进,分别先后在各大公司得到了突破性的发展,这主要取决于VA模式本身所具有的宽视野角、高对比度和无需摩擦配向等优势,再有就是,VA模式显示的对比度对液晶的光学各向异性(△n)、液晶盒的厚度(d)和入射光的波长(λ)依赖度较小,必将使得VA这种模式成为极具前景的显示技术。
但是,VA模式等的有源矩阵寻址方式的显示元件所用的液晶介质,本身并不完美,例如残像水平要明显差于正介电各向异性的显示元件,响应时间比较慢,驱动电压比较高等缺点。此时,一些新型的VA显示技术悄然而生:像PSVA技术即实现了MVA/PVA类似的广视野角显示模式,也简化了CF工艺,从而降低CF成本的同时,提高了开口率,还可以获得更高的亮度,进而获得更高的对比度。此外,由于整面的液晶都有预倾角,没有多米诺延迟现象,在保持同样的驱动电压下还可以获得更快的响应时间,残像水平也不会受到影响,但是由于像素中Fine Slit密集分布电极,故如果电极宽度不能均匀分布,很容易出现显示不均的问题。像UVVA技术,在保持PSVA技术优势的基础上,由于在TFT侧没有Slit结构,出现像素电极宽度不均引起的显示不均问题还得到了改进。虽然显示器件在不断的发展,但是人们还要一直致力于研究新的液晶化合物,得以使液晶介质及其应用于显示器件的性能不断的向前发展。
前期我司发明了末端基团含有取代基的2,3-二氟苯基团的负性液晶化合物,虽然性能上具有负介电各向异性绝对值大、低黏度、大K值和高清亮点等优点,当与烷基类末端基团的化合物结合开发液晶介质时互溶性会提升,但单独使用此类化合物时相对烷基类末端基团的化合物互溶性会差一些,本发明为了解决此互溶性的技术问题,故提供了一种含有环丙基的2,3-二氟苯基团的负性液晶化合物的液晶介质。
发明内容
本发明的目的是提供一种含有环丙基的负介电各向异性的极性化合物的液晶组合物及应用,特别适用于具有有源矩阵寻址的电光显示器,所述显示器基于VA(垂直配向)模式或IPS(面内切换)模式或FFS(边缘场切换),包括进一步的发展如MVA(多畴VA),PVA(图案化VA)或CPA(广视角)模式,及新型的PSVA(聚合物稳定配向)和UV2A(UV光垂直配向)模式等。
所述液晶组合物包含式Ⅰ-1和/或式Ⅰ-2所示化合物中的一种或多种化合物,
其中,
R1、R2各自独立地表示碳原子数为1-10的烷基或碳原子数为1-10的烷氧基;
Z表示单键、-CH2-、-CH2-CH2-、-CH=CH-、-C≡C-、-COO-、-OOC-、-OCH2-或-CH2O-中的一种或多种;
环A表示为以下基团中的一种或多种:
m、n、o各自独立地表示0、1、2或3,当m﹥1时,环A可以相同或不同;
所述液晶组合物还包含一种或多种式Ⅱ所示的化合物;
其中,
R3、R4可以相同或不同,各自独立地表示碳原子数为1-10的烷基或碳原子数为1-10的烷氧基;
环B、环C各自独立地表示以下基团中的一种或多种;
p表示1、2或3,当p>1时,环B可以相同或不同。
所述式Ⅰ-1所示化合物优选为式Ⅰ-1-1至式Ⅰ-1-5所示化合物;所述式Ⅰ-2所示化合物优选为式Ⅰ-2-1至式Ⅰ-2-4所示化合物:
其中,
R1、R2各自独立地表示碳原子数为1-7的烷基或碳原子数为1-7的烷氧基;
Z各自独立地表示单键、-CH2-、-C2H4-或-CH2O-中的一种或多种;
o、n各自独立地表示0、1、2或3。
所述式Ⅱ所示化合物优选为如下化合物:
其中,R3、R4可以相同或不同,各自独立地表示碳原子为1-7的烷基或碳原子数为1-7的烷氧基。
本发明所提供的液晶组合物还可以包含一种或多种式Ⅲ所示的化合物:
其中,R5、R6各自独立地表示碳原子为1-10的烷基或碳原子数为1-10的烷氧基;
X表示为单键、-CH2-、-CH2-CH2-、-CH=CH-、-C≡C-、-COO-、-OOC-、-OCH2-或-CH2O-中的一种或多种;
环D表示以下基团中的一种或多种:
a、b各自独立地表示0、1或2,当a>1,环D可以相同或不同;
L1、L2各自独立地表示H或F。
所述式Ⅲ所示的化合物优选为如下所示化合物
其中,R5、R6可以相同或不同,各自独立地表示碳原子为1-7的烷基或碳原子数为1-7的烷氧基;
X可相同或不同,各自独立地表示单键、-CH2-、-CH2-CH2-或-CH2O-中的一种或多种;
b表示为0、1或2。
本发明全部的化合物可通过自身已知的方法制备,液晶组合物通过常规的方法制备。通常将各成分混合加热使其互相溶解,直至观察到溶解过程完成。也可以在合适的有机溶剂中将所有成分溶解,在彻底混合后除去溶剂,最终得到均一的液晶组合物。
本发明还涉及包含本发明所提供液晶组合物的液晶显示器件,优选通过有源矩阵寻址的液晶显示器件。所述的显示器,优选为IPS显示器、FFS显示器、VA显示器。
由于采用了上述技术方案,本发明所取得的技术进步在于:
本发明的液晶组合物具有高清亮点、大的负介电各向异性。特别适用于高分辨率、快速响应的有源矩阵显示器。
由于使用了环丙基类化合物,所取得的技术进步在于增加了负介电各向异性液晶组合物的互溶性,并且使得负介电各向异性液晶组合物具有高电荷保持率、大介电、低粘度、响应时间快的特点,适用于有源矩阵电光学元件和液晶显示器中。
具体实施方式
下面结合具体实施例对本发明作进一步阐述,但本发明并不限于以下实施例。在不偏离本发明主旨或范围的情况下,通过在本发明的液晶组合物内还可以通过对各组分含量的调整,修改或改良出具有不同阈值,清亮点,双折射特性的液晶混合物,这对本领域技术人员是显而易见的。所述方法如无特别说明均为常规方法。所述材料如无特别说明均能从公开商业途径而得。
在以下的实施例中所采用的各成分,均可以通过公知的方法进行合成,或者通过商业途径获得。这些合成技术是常规的,所得到的各液晶化合物经测试符合电子类化合物标准。
实施例中的符号的具体意义及测试条件如下:
Cp:单位℃,表示液晶的清亮点。
△n:光学各向异性,△n=ne-no,其中,no为寻常光的折射率,ne为非寻常光的折射率,测试条件为,589nm,25±0.5℃。
△ε:介电各向异性,△ε=ε∥-ε⊥,其中,ε∥为平行于分子轴的介电常数,ε⊥为垂直于分子轴的介电常数,测试条件为25±0.5℃;1KHz;HP4284A;4.0微米VA盒。
γ1:旋转粘度,单位mPa·s,测试条件为25±0.5℃。
实施例1
本实施例的液晶组合物按百分含量包括下列化合物:
以上所有结构式中的环己基均为反式构型。组合物的物理参数如下;
Δn=0.077;Δε=-3.8;ε⊥=9.6;Cp=85.6℃;γ1=90.3;
实施例2
本实施例的液晶组合物按百分含量包括下列化合物:
以上所有结构式中的环己基均为反式构型。组合物的物理参数如下;
Δn=0.1255;Δε=-1.7;ε⊥=8.8;Cp=92.7℃;γ1=96.4;
实施例3
以上所有结构式中的环己基均为反式构型。组合物的物理参数如下;
Δn=0.1170;Δε=-3.6;ε⊥=12.6;Cp=98.5℃;γ1=95.0;
实施例4
以上所有结构式中的环己基均为反式构型。组合物的物理参数如下;
Δn=0.0984;Δε=-2.8;ε⊥=8.2;Cp=89.4℃;γ1=92.7
实施例5
以上所有结构式中的环己基均为反式构型。组合物的物理参数如下;
Δn=0.1550;Δε=-7.2;ε⊥=12.3;Cp=95.4℃;γ1=100.6
实施例6
以上所有结构式中的环己基均为反式构型。组合物的物理参数如下;
Δn=0.2015;Δε=-6.2;ε⊥=14.8;Cp=100.7℃;γ1=110.9;
实施例7
以上所有结构式中的环己基均为反式构型。组合物的物理参数如下;
Δn=0.1735;Δε=-5.5;ε⊥=9.6;Cp=105.5℃;γ1=110.9;
虽然,上文中已经用一般性说明及具体实施方案对本发明做了详尽的描述,但他们是本发明的代表例,在本发明基础上,可以对之做一些修改和改进,这对本领域技术人员而言是显而易见的。因此,本发明并不是有上述说明而限定,在不偏离本发明精神的基础上所做的这些修改或改进,均属于本发明要求保护的范围。
Claims (7)
1.一种液晶组合物,其特征在于:所述液晶组合物包含式Ⅰ-1和/或式Ⅰ-2所示化合物中的一种或多种化合物,
其中,
R1、R2各自独立地表示碳原子数为1-10的烷基或碳原子数为1-10的烷氧基;
Z表示单键、-CH2-、-CH2-CH2-、-CH=CH-、-C≡C-、-COO-、-OOC-、-OCH2-或-CH2O-中的一种或多种;
环A表示为以下基团中的一种或多种:
m、n、o各自独立地表示0、1、2或3,当m﹥1时,环A可以相同或不同;
所述液晶组合物还包含一种或多种式Ⅱ所示的化合物;
其中,
R3、R4可以相同或不同,各自独立地表示碳原子数为1-10的烷基或碳原子数为1-10的烷氧基;
环B、环C各自独立地表示以下基团中的一种或多种;
p表示1、2或3,当p>1时,环B可以相同或不同。
2.根据权利要求1所述的液晶组合物,其特征在于:所述式Ⅰ-1所示化合物为式Ⅰ-1-1至式Ⅰ-1-5所示化合物;所述式Ⅰ-2所示化合物为式Ⅰ-2-1至式Ⅰ-2-4所示化合物:
其中,
R1、R2各自独立地表示碳原子数为1-7的烷基或碳原子数为1-7的烷氧基;
Z各自独立地表示单键、-CH2-、-C2H4-或-CH2O-中的一种或多种;
o、n各自独立地表示0、1、2或3。
3.根据权利要求1所述的液晶组合物,其特征在于:所述式Ⅱ所示化合物为如下化合物:
其中,R3、R4可以相同或不同,各自独立地表示碳原子为1-7的烷基或碳原子数为1-7的烷氧基。
4.根据权利要求1-3中任一所述的液晶组合物,其特征还在于:所述液晶组合物还包含一种或多种式Ⅲ所示的化合物:
其中,R5、R6各自独立地表示碳原子为1-10的烷基或碳原子数为1-10的烷氧基;
X表示为单键、-CH2-、-CH2-CH2-、-CH=CH-、-C≡C-、-COO-、-OOC-、-OCH2-或-CH2O-中的一种或多种;
环D表示以下基团中的一种或多种:
a、b各自独立地表示0、1或2,当a>1,环D可以相同或不同;
L1、L2各自独立地表示H或F。
5.权利要求4所述的液晶组合物,其特征在于:所述式Ⅲ所示的化合物为如下所示化合物
其中,R5、R6可以相同或不同,各自独立地表示碳原子为1-7的烷基或碳原子数为1-7的烷氧基;
X可相同或不同,各自独立地表示单键、-CH2-、-CH2-CH2-或-CH2O-中的一种或多种;
b表示为0、1或2。
6.一种液晶显示器,其特征在于:所述液晶显示器包含根据权利要求1-5中任一所述的液晶介质。
7.根据权利要求6所述的液晶显示器,其特征在于:所述液晶显示器通过有源矩阵寻址。
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