CN109486500B - 液晶组合物及其液晶显示元件或显示器 - Google Patents

液晶组合物及其液晶显示元件或显示器 Download PDF

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CN109486500B
CN109486500B CN201710816855.5A CN201710816855A CN109486500B CN 109486500 B CN109486500 B CN 109486500B CN 201710816855 A CN201710816855 A CN 201710816855A CN 109486500 B CN109486500 B CN 109486500B
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liquid crystal
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CN109486500A (zh
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王明霞
张兴
王会芳
王国芳
程建明
邵哲
员国良
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Shijiazhuang Chengzhi Yonghua Display Material Co Ltd
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Abstract

本发明公开了一种负介电各向异性液晶组合物，其特征在于：所述液晶组合物包含一种或多种式I所示化合物、一种或多种式II所示化合物、一种或多种式Ⅲ所示化合物以及一种或多种式Ⅳ所示化合物，

Description

液晶组合物及其液晶显示元件或显示器
技术领域
本发明属于液晶显示领域，具体涉及一种液晶组合物及包含该液晶组合物的液晶显示元件或液晶显示器。
背景技术
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。
发明内容
本发明提供一种负介电各项异性液晶组合物，及包含该液晶组合物的液晶显示元件或液晶显示器。该组合物液晶分子之间通过相互之间的范德瓦耳斯力作为原动力，使得液晶分子在适当的距离和位置关系下产生引力，从而使得液晶分子具有优良的规则排列特性，有利于液晶分子在液晶显示器件中对光的透过和遮断进行调制。
本发明提供了一种负介电各向异性液晶组合物，包含一种或多种式I所示化合物、一种或多种式II所示化合物、一种或多种式Ⅲ所示化合物以及一种或多种式Ⅳ所示化合物，
其中，R1、R3各自独立地表示碳原子数为1-5的直链烷基、碳原子数为1-5的直链烷氧基、碳原子数为2-5的烯基、或/>
R2、R4各自独立地表示碳原子数为1-5的直链烷基、碳原子数为1-5的直链烷氧基、碳原子数为2-5的烯基、F、CF3或OCF3；
表示/>或/>
所述液晶组合物中所述一种或多种式I所示化合物的总质量含量优选为1-50％，特别优选30-50％；所述一种或多种式Ⅱ所示化合物的总质量含量优选为1-20％，进一步优选5-20％，特别优选10-18％；所述一种或多种式Ⅲ所示化合物总质量含量优选为1-20％，进一步优选2-12％，特别优选3-10％；所述一种或多种式Ⅳ所示化合物总质量含量优选为1-25％，进一步优选2-20％，特别优选2-15％。
所述一种或多种式Ⅲ所示化合物优选为式Ⅲ1-Ⅲ27所示化合物中的一种或多种，所述一种或多种式Ⅳ所示化合物优选为式Ⅳ1-Ⅳ4所示化合物中的一种或多种，
其中，alkyl、alkyl*各自独立地表示碳原子数为1-5的直链烷基；
alkoxy、alkoxy*各自独立地表示碳原子数为1-5的直链烷氧基；
alkenyl、alkenyl*各自独立地表示碳原子数为2-5的烯基；
R3各自独立地表示碳原子数为1-5的直链烷基、碳原子数为1-5的直链烷氧基、碳原子数为2-5的烯基、或/>
R4各自独立地表示碳原子数为1-5的直链烷基、碳原子数为1-5的直链烷氧基或碳原子数为2-5的烯基。
一种或多种式Ⅲ所示化合物进一步优选一种或两种以下化合物,特别优选两种以下化合物
所述液晶组合物还可以包含至少两种选自式VA、VB、VC的化合物，
其中，R5、R6、R7各自独立地表示碳原子数为1-5的直链烷基、碳原子数为1-5的直链烷氧基或碳原子数为2-5的烯基；
L1-L6各自独立地表示H或F；
p表示1或2；
v各自独立地表示1-6的整数；
Z表示单键、-CH2CH2-、-CH2O-、-OCH2-。
其中包含式VA、VB、VC的两种、三种、四种、五种或六种化合物。优选包含两种、三种式VA化合物，特别是式VA1-VA6化合物；进一步优选包含两种式VA化合物，特别是式VA1、VA2、VA4、VA6化合物；优选包含两种、三种VB化合物特别是VB1和VB2化合物。
其中式VA和/或VB和/或VC的化合物在整个混合物中的比例优选至少为10％重量。
本发明所提供的液晶介质进一步优选包含至少一种可聚合化合物。可聚合化合物可以为RM1-RM6所示化合物，
本发明所提供的液晶介质进一步优选包含至少一种添加剂。添加剂可以为式Ⅵ1-Ⅵ6所示化合物。
s选自1-10的整数。
本发明所提供的液晶组合物，还可以包含一种或多种下式的化合物
优选含量为＞3％，特别是≥5％；
R8具有和R5相同的含义；并且m表示1-6的整数。
本发明的液晶组合物适用于所有VA、PSA、PA-VA、SS-VA、SA-VA、PS-VA、PALC、IPS、PS-IPS、FFS或PS-FFS效应的显示器的用途。
具体实施方式
下面结合具体实施例对本发明做进一步详细说明，但本发明并不限于以下实施例。所述方法如无特别说明均为常规方法。所述原料如无特别说明均能从公开商业途径而得。所述百分比如无特别说明，均为质量百分比。
下述实施例中，
CP表示清亮点，直接使用WRX-1S显微热分析仪测定，设定升温速率为3℃/min。
Δn表示光学各向异性(589nm，20℃)，
Δε表示介电各向异性(25℃，1KHz，HP4284A，5.2微米TN左旋盒)，
γ1表示20℃时旋转粘度(mpas)，VHR(％)代表电荷保持率(5V,60Hz,20℃)，ρ(×1013Ω·cm)代表电阻率(20℃)，
k33表示弯曲弹性常数
τ表示响应时间：ton+toff
ton直至达到最大对比度90％时接通时的时间
toff直至达到最大对比度10％时切断时的时间
电压保持率VHR(％)的测试仪与电阻率ρ(×1013Ω·cm)均为TOYO06254和TOYO6517型液晶物性评价系统(测试温度20℃，时间16ms，测试盒为7.0微米)。
γ1/k33越小越容易对光的透过和遮断进行调制。
此外，本发明申请实施例液晶单体结构用代码表示，液晶环结构、端基、连接基团的代码表示方法见下表(一)、表(二)。
表(一)：环结构的对应代码
表(二)：端基与链接基团的对应代码
举例：
CC-C(5)-V1
PGUQU-3-F
以下列表为对比液晶和6种液晶组成物配方及基本光学参数：
对比液晶组合物1：
对比液晶组合物2：
/>
对比液晶组合物3：
对比液晶组合物4：
对比液晶组合物5：
液晶组合物1
/>
液晶组合物2
/>
液晶组合物3
液晶组合物4两种式III
/>
液晶组合物5
/>
液晶组合物6
液晶组合物7
/>
液晶组合物8
/>
液晶组合物9
液晶组合物10
/>
/>

Claims (5)

1.一种负介电各向异性液晶组合物，其特征在于：所述液晶组合物包含一种式I所示化合物、一种式II所示化合物、多种式Ⅲ所示化合物以及一种式Ⅳ4所示化合物，还包含一种式VA1所示化合物和一种式VA4所示化合物，其中所述多种式Ⅲ所示化合物选自与/>的组合或者/>与/>的组合；
其中，R3表示碳原子数为3的直链烷基；
R4表示碳原子数为2的直链烷氧基；
R5表示碳原子数为3的直链烷基；
(o)表示氧原子；
v表示整数2；
所述液晶组合物中所述一种式I所示化合物的总质量含量为40％，所述一种式Ⅱ所示化合物的总质量含量为5％，所述多种式Ⅲ所示化合物的总质量含量为10％，所述一种式Ⅳ4所示化合物总质量含量为15％，所述一种式VA1所示化合物总质量含量为15％，所述一种式VA4所示化合物总质量含量为15％。
2.根据权利要求1所述的液晶组合物，其特征在于：所述液晶介质包含至少一种可聚合化合物。
3.据权利要求1所述的液晶组合物，其特征在于：所述液晶介质包含至少一种添加剂。
4.具有有源矩阵寻址的光电显示器，其特征在于：所述光电显示器含有权利要求1-3中任一所述的液晶组合物作为电介质。
5.根据权利要求4所述的光电显示器，其特征在于：所述光电显示器为VA、PSA、PA-VA、SS-VA、SA-VA、PS-VA、PALC、IPS、PS-IPS、FFS或PS-FFS显示器。
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