CN103013533A - 液晶组成物、液晶配向混合物及液晶面板 - Google Patents

液晶组成物、液晶配向混合物及液晶面板 Download PDF

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CN103013533A
CN103013533A CN2012105355059A CN201210535505A CN103013533A CN 103013533 A CN103013533 A CN 103013533A CN 2012105355059 A CN2012105355059 A CN 2012105355059A CN 201210535505 A CN201210535505 A CN 201210535505A CN 103013533 A CN103013533 A CN 103013533A
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liquid crystal
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CN103013533B (zh
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谢忠憬
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Abstract

本发明公开一种液晶组成物、液晶配向混合物及液晶面板，所述组成物包含一种或多种二氟烯基取代的第一液晶分子以及一种或多种垂直配向用的第二液晶分子。通过带有二氟烯基的第一液晶分子所造成的立体效应可有效地降低高分子配向过程中可聚合单体与第一液晶分子之间的聚合发生率，提高与配向膜表面聚酰亚胺的聚合发生，从而解决影像残留的问题。

Description

液晶组成物、液晶配向混合物及液晶面板
技术领域
本发明是有关于一种液晶组成物，特别是有关于一种具有二氟烯基的液晶分子所组成的液晶组成物、液晶配向混合物及液晶面板。
背景技术
液晶显示器（Liquid Crystal Display,LCD）是利用液晶材料的特性来显示图像的一种平板显示装置，其相较于其他显示装置而言具有轻薄、低驱动电压及低功耗等优点，已经成为整个消费市场上的主流产品。
评价液晶显示器的主要技术参数有：①对比度、②亮度、③响应时间和④可视角度。目前，主要通过含有快速响应液晶组成物的液晶面板来达到提高液晶显示器的响应时间。
进一步来说，请参见图1，图1所示的是目前由快速响应液晶组成物制成的液晶面板的配向过程示意图。所述的快速响应液晶混合物30’包括常规的一种或多种液晶分子31’以及33’的液晶组成物和可聚合单体（ReactiveMonomer,RM）32’。使用滴下式注入技术（One Drop Fill）使液晶混合物30’扩散于基板10’的配向膜20’表面，然后经过施加电压、第一次紫外线照射、第二次紫外线照射等工序，完成配向过程。由图1可以看出，在完成配向之后，仍有相当一部分RM 32’残留在液晶混合物30’中。为达到快速响应的效果，通常液晶混合物30’会采用具有双键取代的液晶分子，因此可聚合单体RM32’更可能在配向过程中与具有双键的液晶分子键结，使得制得的液晶面板存在影像残留（Image Sticking）的问题。
因此，有必要提供一种能够有效降低RM与液晶分子的聚合反应，以解决现有技术所存在的问题。
发明内容
有鉴于此，本发明的第一个目的是提供一种液晶组成物，在高分子配向过程中，降低液晶分子与可聚合单体的聚合反应，促使可聚合单体与配向膜间的聚合物生成，从而解决可聚合单体在液晶分子间的残留，进而改善影像残留现象。
为达成本发明的前述目的，本发明一实施例提供一种液晶组成物，其中所述液晶组成物包含︰一种或多种二氟烯基取代的第一液晶分子以及一种或多种垂直配向用的第二液晶分子。
在本发明的一实施例中，所述第一液晶分子具有下列通式(I)：
式(I)
所述A基团为硬核，包含至少一个六元环。
在本发明的一实施例中，所述第二液晶分子为仅具有烷基取代的液晶分子，其具有下列通式(II)：
Figure BDA00002574350100022
式(II)
其中所述B基团为硬核，包含至少一个六元环。
在本发明的一实施例中，所述液晶组成物通过高分子配向技术(PSA)扩散分布。
本发明另一实施例提供一种液晶配向混合物，用于高分子配向技术，使得液晶分子扩散分布于配向膜表面，其特征在于，所述液晶配向混合物包含：一种或多种二氟烯基取代的第一液晶分子以及一种或多种垂直配向用的第二液晶分子；以及一种可聚合单体。
在本发明的一实施例中，所述第一液晶分子的重量比为0.1~20%，所述第二液晶分子的重量比为80~99.0%以及所述可聚合单体的重量比为0.015~0.5%。
在本发明的一实施例中，所述可聚合单体为光反应性单体。
在本发明的一实施例中，所述可聚合单体具有甲基丙烯酸基。
在本发明的一实施例中，所述可聚合单体具有下列通式(III)：
式(III)
所述C基团为硬核，包含至少一个六元环。
在本发明的一实施例中，所述可聚合单体通过甲基丙稀酸基与所述配向膜生成配向聚合物。
在本发明的一实施例中，所述配向膜包含聚酰亚胺。
本发明再一实施例提供一种液晶面板，其特征在于，所述液晶面板包含一第一基板，具有一第一配向膜；一第二基板，具有一第二配向膜；以及液晶材料，填充于所述第一基板及第二基板之间，所述液晶材料包含一种或多种二氟烯基取代的第一液晶分子以及一种或多种垂直配向用的第二液晶分子。
与现有技术相比较，本发明的液晶组成物，由于二氟烯基的立体效应，可降低液晶分子上的双键与可聚合单体反应，从而解决现有技术中影像残留的问题。
为让本发明的上述内容能更明显易懂，下文特举优选实施例，并配合所附图式，作详细说明如下：
附图说明
图1是一现有的快速响应液晶组成物制成的液晶面板的配向过程示意图；
图2是由本发明的液晶组成物制成的液晶面板的配向过程示意图；
图3是本发明配向液晶混合物示意图；
图4是包含本发明液晶组成物的液晶面板；其中
10’—液晶面板的基板；
20’—配向层；
30’—现有技术的快速响应液晶混合物；
31’、33’—现有技术的液晶分子；
32’—现有技术的反应型单体（RM）；
10—本发明一实施例中液晶面板的第一基板；
11—本发明一实施例中液晶面板的第二基板；
20—本发明一实施例中液晶面板的第一配向膜；
21—本发明一实施例中液晶面板的第二配向膜；
30—本发明一实施例中液晶面板的液晶配向混合物；
31—本发明的液晶组成物中的第二液晶分子；
32—本发明的液晶组成物中的可聚合单体；
33—本发明的液晶组成物中的第一液晶分子。
具体实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例，此外，实施例旨在解释而非限定本发明的技术方案。
请参照图2所示本发明的液晶组成物制成的液晶面板的配向过程示意图。本发明第一实施例主要是ODF步骤后，在第一基板10与第二基板(未绘示)间填充液晶配向混合物30，其中包含第一液晶分子33，第二液晶分子31以及可聚合单体32。通过施加电压使得所述液晶配向混合物30中的所述第二液晶分子31、所述第一液晶分子33以及所述可聚合单体32旋转至一定角度后，进行第一次紫外线UV照射，此时所述可聚合单体32会在配向膜20的聚酰亚胺表面反应生成聚合物。接着进行第二次紫外线UV照射，可将剩余的所述可聚合单体32再次反应，从图2最后的状态可以看到，几乎没有剩余的所述可聚合单体32存在，从而达到改善影像残留的问题。
请参照图3，根据本发明的一较佳实施例，本发明提供一种液晶配向混合物30，包含第一液晶分子33，第二液晶分子31以及可聚合单体32。所述第一液晶分子33为具有二氟烯基取代的液晶分子，可用以做为一种稀释剂，适当分布于液晶配向混合物中，其具有下列通式(I)：
Figure BDA00002574350100051
式(I)
其中，A基团为硬核，至少包含一个六元环，可例如为结构
Figure BDA00002574350100052
上述通式(I)的所述第一液晶分子33的制备方法，可通过在1000毫升反应瓶中加入0.2摩尔的二氟氯乙酸钠(CF2ClCOONa)、0.2摩尔的三苯基膦(PPh3)、0.2摩尔的2-(4'-烷基双环己基)乙醛和500毫升的二甲基甲酰胺(DMF)，在80℃下反应4小时。之后将反应液倒入水中，用乙酸乙酯进行萃取，合并的有机层用水洗涤至中性，然后经干燥、旋转蒸发处理，再进行柱层析，得到0.1摩尔的产物，回收率50%。相关反应式如下：
再者，所述第二液晶分子33为不具有双键取代的液晶分子，即仅具有烷基取代的液晶分子，例如为传统的垂直配向的液晶分子(VA-LC)，其具有下列通式(II)：
Figure BDA00002574350100054
式(II)
其中，B基团为硬核，至少包含一个六元环；所述B基团基本上可以相同于所述第一液晶分子33的A基团。
另外，所述可聚合单体32可为光反应性单体，较佳的是具有甲基丙烯酸基的可聚合单体，具有下列通式(III)：
Figure BDA00002574350100061
式(III)
其中，C基团为硬核，至少包含一个六元环；所述C基团基本上可以相同于所述第一液晶分子的A基团或所述第二液晶分子的B基团。
根据本发明的一较佳实施例，所述配向膜20包含聚酰亚胺，与所述可聚合单体32反应生成配向聚合物。
根据本发明的一较佳实施例，所述第一液晶分子33的重量比为0.1~20%，所述第二液晶分子31的重量比为80~99.0%以及所述可聚合单体32的重量比为0.015~0.5%。
请参照图4所示，本发明第二实施例的图4所示的是含有本发明液晶组成物的液晶面板，包括：一配置有一第一配向膜20的第一基板10、一配置有一第二配向膜21的第二基板11，以及填充于所述第一基板10和所述第二基板11之间的液晶组成物。所述液晶组成物扩散于所述第一配向膜20和第二配向膜21表面。所述第一基板10可为彩色滤光片基板，所述第二基板11可为薄膜晶体管阵列基板。所述第一配向膜20和第二配向膜21均为垂直配向型的配向膜。
根据本发明的一较佳实施例，本发明的液晶组成物包含；一种或多种二氟烯基取代的第一液晶分子33以及一种或多种不具有双键取代的液晶分子，即仅具有烷基取代的第二液晶分子31，由于所述第一液晶分子33所带有的二氟烯基的立体效应，可有效阻止液晶分子上的双键与所述可聚合单体32发生聚合反应，从而解决现有技术中影像残留的问题。
本发明已由上述相关实施例加以描述，然而上述实施例仅为实施本发明的范例。必需指出的是，已公开的实施例并未限制本发明的范围。相反地，包含于权利要求书的精神及范围的修改及均等设置均包括于本发明的范围内。

Claims (10)

1.一种液晶组成物，其特征在于，所述液晶组成物包含一种或多种二氟烯基取代的第一液晶分子以及一种或多种垂直配向用的第二液晶分子。
2.如权利要求1所述的液晶组成物，其特征在于，所述第一液晶分子具有下列通式(I)：
Figure FDA00002574350000011
式(I)
其中所述A基团为硬核，包含至少一个六元环。
3.如权利要求1所述的液晶组成物，其特征在于，所述第二液晶分子为仅具有烷基取代的液晶分子，其具有下列通式(II)：
Figure FDA00002574350000012
式(II)
其中所述B基团为硬核，包含至少一个六元环。
4.一种液晶配向混合物，用于高分子配向技术，使得液晶分子扩散分布于配向膜表面，其特征在于，所述液晶配向混合物包含：
如权利要求1所述的液晶组成物；以及
一种可聚合单体。
5.如权利要求4所述的液晶配向混合物，其特征在于，所述第一液晶分子的重量比为0.1~20%，所述第二液晶分子的重量比为80~99.0%以及所述可聚合单体的重量比为0.015~0.5%。
6.如权利要求4所述的液晶配向混合物，其特征在于，所述可聚合单体为甲基丙烯酸基的光反应性单体。
7.如权利要求6所述的液晶配向混合物，其特征在于，所述可聚合单体具有下列通式(III)：
Figure FDA00002574350000021
式(III)
所述C基团为硬核，包含至少一个六元环。
8.如权利要求4所述的液晶配向混合物，其特征在于，所述可聚合单体通过甲基丙稀酸基与所述配向膜生成配向聚合物。
9.如权利要求8所述的液晶配向混合物，其特征在于，所述配向膜包含聚酰亚胺。
10.一种液晶面板，其特征在于，所述液晶面板包含
一第一基板，具有一第一配向膜；
一第二基板，具有一第二配向膜；以及
液晶材料，填充于所述第一基板及第二基板之间，所述液晶材料包含如权利要求1所述的液晶组成物。
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