TWI731324B - 正介電各向異性液晶組合物及液晶顯示元件 - Google Patents

正介電各向異性液晶組合物及液晶顯示元件 Download PDF

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TWI731324B
TWI731324B TW108112155A TW108112155A TWI731324B TW I731324 B TWI731324 B TW I731324B TW 108112155 A TW108112155 A TW 108112155A TW 108112155 A TW108112155 A TW 108112155A TW I731324 B TWI731324 B TW I731324B
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黃亞鵬
喬雲霞
溫剛
崔青
員國良
王明霞
康素敏
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大陸商石家莊誠志永華顯示材料有限公司
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Abstract

本發明涉及正介電各向異性液晶組合物及液晶顯示元件，所述正介電各向異性液晶組合物包含一種或多種式I化合物及一種或多種式II化合物。本發明所揭露的液晶組合物具有正介電、高電壓保持率，低旋轉黏度、反應時間快，尤其是透過率高的特點，適用於製造高透過率、快速反應的TFT-LCD。
Figure 108112155-A0305-02-0001-1

Description

正介電各向異性液晶組合物及液晶顯示元件
本發明屬於液晶材料技術領域，具體涉及液晶組合物及液晶顯示元件。
在19世紀末，奧地利植物學家發現了液晶，即液態的晶體，也就是說一種物質同時具備了液體的流動性和類似晶體的某種排列特性。在電場的作用下，液晶分子的排列會產生變化，從而影響它的光學性質。英國科學家利用這個性質在上世紀製造了第一塊液晶顯示器即LCD(Liquid Crystal Display)。液晶顯示材料具有驅動電壓低、功耗微小、可靠性高、顯示訊息量大、彩色顯示等優點，液晶顯示器得到了較快的發展，液晶單體更新換代速度加快。目前液晶單體已有1萬多種，主要應用於TN、STN發展到現在彩色大螢幕的TN-TFT、VA-TFT、IPS-TFT、PDLC等顯示模式。
目前在液晶顯示元件行業，顯示模式主要有，面內切換(in-plane switching，IPS)、邊緣場切換(fringe-field switching，FFS)和垂直排列(vertical alignment，VA)等顯示模式。其中，面內切換(IPS)具有寬視角的特點，液晶分子指向矢和玻璃基板方向是平行的，平行排列方式的IPS，液晶的介電各向異性(△ε)既可以是正的，也可以是負的。邊緣場切換(FFS)屬於面內切換(IPS)模式中的一種。垂直取向模式(VA)具有良好的對比度，液晶分子在零場時和 玻璃基板方向垂直，與垂直入射光線平行。當偏振片正交時，會顯示良好的暗態，液晶的介電各向異性(△ε)必須是負的。
穿透率影響液晶面板的對比度，是一個很重要的因素。穿透率在面內切換、邊緣場切換和垂直排列等顯示模式中只有大約5%左右的背光能夠穿透顯示元件，大部分光被消耗了，造成面板能耗較高。
為了解決上述技術問題，本發明提供了一種正介電各向異性液晶組合物，所述液晶組合物包含一種或多種式I所示的負性化合物以及一種或多種式II所示的中性化合物，
Figure 108112155-A0305-02-0003-4
式I中，R1表示環丙基、環丁基、環戊基；Z表示單鍵、-CH2-、-O-、-CH2CH2-或-CH2O-；R2表示氫原子、氟原子、碳原子數為1-7的烷基或碳原子數為1-7的烷氧基，X表示氧原子或硫原子；式II中，R3、R4各自獨立地表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基、氟取代的碳原子數為2-10的鏈烯基、碳原子數為3-8的鏈烯氧基或氟取代的碳原子數為3-8的鏈烯氧基；
Figure 108112155-A0305-02-0003-6
、
Figure 108112155-A0305-02-0003-7
各自獨立地表示
Figure 108112155-A0305-02-0003-9
或
Figure 108112155-A0305-02-0003-11
。
本發明的發明人等經過深入研究發現，藉由在液晶組合物中組合使用式I所示的具有氧芴、硫芴類液晶組合物與式II所示的液晶化合物，獲得了 具有高的折射率從而穿透率顯著提高的液晶組合物。雖然折射率提高的詳細原理並不十分清楚，發明人推測，由於氧芴、硫芴類液晶化合物側向具有二個氟原子，並且分子內存在剛性結構，從而限制了二個苯環之間的偏轉，使得這類化合物的介電各向異性的絕對值很大，從而具有很高的折射率，能夠明顯的提升液晶組合物的穿透率。藉由在液晶組合物中添加式I所示的氧芴、硫芴類液晶化合物，能夠提高液晶組合物的透過率、反應時間，可明顯地提升液晶顯示元件的穿透率，降低液晶顯示元件的能耗。本發明的液晶組合物可應用於IPS-TFT、FFS-TFT和OCB等模式的顯示元件。
本發明的正介電各向異性液晶組合物中，一種或多種式I所示的負性化合物的總質量含量較佳為1-30%，一種或多種式II所示的中性化合物的總質量含量較佳為20-80%；本發明的正介電各向異性液晶組合物中，較佳的是，一種或多種式I所示的負性化合物選自下列式I1至式I24所示的化合物組成的群組：
Figure 108112155-A0305-02-0004-12
Figure 108112155-A0305-02-0005-13
較佳的是，一種或多種式II所示的中性化合物選自下述的式II1至II3所示的化合物組成的群組：
Figure 108112155-A0305-02-0005-16
其中，D1、D2各自獨立地表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基、氟取代的碳原子數為2-10的鏈烯基、碳原子數為3-8的鏈烯氧基或氟取代的碳原子數為3-8的鏈烯氧基。
本發明的正介電各向異性液晶組合物中，較佳的是，一種或多種式III所示的化合物選自下述的式III-a-III-q所示化合物組成的群組：
Figure 108112155-A0305-02-0006-17
Figure 108112155-A0305-02-0006-20
Figure 108112155-A0305-02-0006-21
Figure 108112155-A0305-02-0006-22
Figure 108112155-A0305-02-0006-23
Figure 108112155-A0305-02-0006-24
Figure 108112155-A0305-02-0006-25
Figure 108112155-A0305-02-0006-26
Figure 108112155-A0305-02-0006-27
Figure 108112155-A0305-02-0006-28
Figure 108112155-A0305-02-0006-29
Figure 108112155-A0305-02-0007-31
Figure 108112155-A0305-02-0007-32
Figure 108112155-A0305-02-0007-33
Figure 108112155-A0305-02-0007-37
Figure 108112155-A0305-02-0007-152
Figure 108112155-A0305-02-0007-39
其中，R7表示碳原子數為1~10的直鏈烷基、
Figure 108112155-A0305-02-0007-44
、
Figure 108112155-A0305-02-0007-190
、
Figure 108112155-A0305-02-0007-189
、碳原子數為1~10的烷氧基或碳原子數為2~10的鏈烯基；Y1表示表示F、 未取代或者被F單取代或多取代的碳原子數1-6的烷基、未取代或者被F單取代或多取代的碳原子數1-6的烷氧基、未取代或者被F單取代或多取代的碳原子數2-6的鏈烯基；(F)表示氫或氟。
本發明的正介電各向異性液晶組合物中，較佳的是，還包含一種或多種式VI所示的化合物：
Figure 108112155-A0305-02-0007-41
式VI中，R11、R12各自獨立地表示碳原子數為1~10的直鏈烷基、
Figure 108112155-A0305-02-0008-46
、
Figure 108112155-A0305-02-0008-47
、
Figure 108112155-A0305-02-0008-48
、碳原子數為1~10的烷氧基或碳原子數為2~10的鏈烯基；
Figure 108112155-A0305-02-0008-49
、
Figure 108112155-A0305-02-0008-50
選自
Figure 108112155-A0305-02-0008-171
或
Figure 108112155-A0305-02-0008-172
所示的基團組成的群組，
Figure 108112155-A0305-02-0008-173
表示反式1,4-亞環己基、1,4-環己烯基，其中一個或多個不相鄰的-CH2-基團被-O-或-S-取代或未取代；
Figure 108112155-A0305-02-0008-174
表示1,4-亞苯基基團，其中一個或兩個-CH-被O取代或未取代，一個或兩個H被F取代或未取代；Z5表示氫或者酯基；c、d各自獨立地表示1或者2。
本發明的正介電各向異性液晶組合物中，較佳的是，一種或多種式VI所示的化合物選自下述的式VI-a至式VI-e所示的化合物組成的群組：
Figure 108112155-A0305-02-0008-54
Figure 108112155-A0305-02-0008-197
Figure 108112155-A0305-02-0008-196
Figure 108112155-A0305-02-0008-198
Figure 108112155-A0305-02-0008-58
其中，R11、R12各自獨立地表示碳原子數為1~10的直鏈烷基、
Figure 108112155-A0305-02-0008-51
、
Figure 108112155-A0305-02-0008-52
、
Figure 108112155-A0305-02-0008-53
、碳原子數為1~10的烷氧基或碳原子數為2~10的鏈烯 基。
本發明的正介電各向異性液晶組合物中，較佳的是，還包含一種或多種式VII所示的化合物：
Figure 108112155-A0305-02-0009-59
式VII中，R13各自獨立地表示碳原子數為1~10的直鏈烷基、
Figure 108112155-A0305-02-0009-62
、
Figure 108112155-A0305-02-0009-64
、
Figure 108112155-A0305-02-0009-65
、碳原子數為1~10的烷氧基或碳原子數為2~10的 鏈烯基；R14表示碳原子數為1~5的直鏈烷基、或者氧原子與苯環相連的烷基醚；
Figure 108112155-A0305-02-0009-60
選自
Figure 108112155-A0305-02-0009-175
或
Figure 108112155-A0305-02-0009-176
所示的基團組成的群組：
Figure 108112155-A0305-02-0009-177
表示反式1,4-亞環己基、1,4-環己烯基，其中一個或多個不相鄰的-CH2-基團被-O-或-S-取代或未取代；
Figure 108112155-A0305-02-0009-178
表示1,4-亞苯基基團，其中一個或兩個-CH-被N取代或未取代，一個或兩個H被F取代或未取代；Z3表示單鍵、-CH2-、-CH2-CH2-、-(CH2)3-、-(CH2)4-、-CH=CH-、-C≡C-、-COO-、-OOC-、-CF2O-、-OCH2-、-CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4-或-CF=CF-； d表示0、1或2；當d=2時，
Figure 108112155-A0305-02-0009-66
可以相同或不同。
本發明的正介電各向異性液晶組合物中，較佳的是，一種或多種式VII所示的化合物選自下述的式VII-a-式VII-i所示的化合物組成的群組：
Figure 108112155-A0305-02-0009-67
Figure 108112155-A0305-02-0009-68
Figure 108112155-A0305-02-0009-69
Figure 108112155-A0305-02-0010-70
Figure 108112155-A0305-02-0010-71
Figure 108112155-A0305-02-0010-72
Figure 108112155-A0305-02-0010-73
Figure 108112155-A0305-02-0010-76
Figure 108112155-A0305-02-0010-192
其中，R13各自獨立地表示碳原子數為1~10的直鏈烷基
Figure 108112155-A0305-02-0010-193
、
Figure 108112155-A0305-02-0010-79
、
Figure 108112155-A0305-02-0010-81
、碳原子數為1~10的烷氧基或碳原子數為2~10的鏈烯基；R14 表示碳原子數為1~5的直鏈烷基、或者氧原子與苯環相連的烷基醚。
本發明的液晶組合物中，可以包含一種或多種選自UV穩定劑、摻雜劑和/或抗氧化劑作為添加劑。
抗氧化劑、紫外線吸收劑、光穩定劑可以列舉下述的物質：
Figure 108112155-A0305-02-0010-82
Figure 108112155-A0305-02-0011-83
S為選自1-10的整數。
下面結合具體實施例對本發明做進一步詳細說明：本發明的液晶組合物可採用將液晶化合物混合的方法進行生產，如在高溫下混合不同組分並彼此溶解的方法製備，本發明的液晶組合物也可按照其他常規的製備方法，如採取加熱、超音波、懸浮等方式製備。
本說明書中的百分比為質量百分比，溫度為攝氏度(℃)，其他符號的具體意義及測試條件如下：Cp表示液晶清亮點(℃)，DSC定量法測試；S-N表示液晶的晶態到向列相的熔點(℃)；△n表示光學各向異性，no為尋常光的折射率，ne為非尋常光的折射率，測試條件為25±2℃，589nm，阿貝折射儀測試；△ε表示介電各向異性，△ε=ε∥-ε⊥，其中，ε∥為平行於分子軸的介電常數，ε⊥為垂直於分子軸的介電常數，測試條件為25±0.5℃，20微米平行盒，INSTEC：ALCT-IR1測試； γ1表示旋轉黏度(mPa．s)，測試條件為25±0.5℃，20微米平行盒，INSTEC：ALCT-IR1測試；ρ表示電阻率(Ω．cm)，測試條件為25±2℃，測試儀器為TOYO SR6517高阻儀和LE-21液體電極。
VHR表示電壓保持率(%)，測試條件為20±2℃、電壓為±5V、脈衝寬度為10ms、電壓保持時間16.7ms。測試設備為TOYO Model 6254液晶性能綜合測試儀。
τ表示反應時間(ms)，測試儀器為DMS-501，測試條件為25±0.5℃，測試盒為3.3微米IPS測試盒，電極間距和電極寬度均為10微米，摩擦方向與電極夾角為10°。
T(%)表示透過率，T(%)=100%*亮態(Vop)亮度/光源亮度，測試設備為DMS-501，測試條件為25±0.5℃，測試盒為3.3微米IPS測試盒，電極間距和電極寬度均為10微米，摩擦方向與電極夾角為10°。
對比例1
Figure 108112155-A0305-02-0012-153
Figure 108112155-A0305-02-0013-154
實施例1
Figure 108112155-A0305-02-0013-155
Figure 108112155-A0305-02-0014-156
由實施例1和對比例1的比較可以看出，組合使用有式I所示的負性化合物和式II所示的中性化合物的實施例1在維持清亮點、折射率、反應時間等性能的水平與對比例1相當的基礎上其透過率顯著增大，從而，獲得了反應快速、透過率高的性能優異的液晶組合物。
實施例2
Figure 108112155-A0305-02-0014-157
Figure 108112155-A0305-02-0015-158
實施例2和對比例1的比較可以看出，透過率增大，反應快，適用於低盒厚的大尺寸IPS-TV等顯示應用，有利於實現寬視角，高對比度，優質的動態畫面播放等性能。
實施例3
Figure 108112155-A0305-02-0015-159
Figure 108112155-A0305-02-0016-160
實施例3和對比例1的比較，折射率基本不變，垂直介電增大，透過率再次增大，同時具有很好的高低溫穩定性，結合IPS顯示模式的寬視角優勢，適用於TV、中小尺寸液晶顯示等領域。
實施例4
Figure 108112155-A0305-02-0017-161
Figure 108112155-A0305-02-0018-162
實施例4的液晶組合物具有合適的折射率和清亮點，高透過率，快速反應，結合IPS顯示模式的寬視角優勢，適用於中小尺寸的手持終端顯示應用。
實施例5
Figure 108112155-A0305-02-0018-163
Figure 108112155-A0305-02-0019-164
實施例5的液晶組合物具有合適的折射率和清亮點，高透過率，快速反應，結合IPS顯示模式的寬視角優勢，適用於手持終端顯示應用。
實施例6
Figure 108112155-A0305-02-0019-165
Figure 108112155-A0305-02-0020-166
實施例6的混晶化合物具有合適的折射率和清亮點，高透過率，快速反應，結合IPS顯示模式的寬視角優勢，適用於智能手機等小尺寸顯示應用。
實施例7
Figure 108112155-A0305-02-0021-167
Figure 108112155-A0305-02-0022-168
實施例7的液晶組合物具有較高的折射率，適用於低盒厚的顯示器，和較高清亮點，有較寬的使用溫度，高透過率，快速反應，結合IPS顯示模式的寬視角優勢，適用於戶外顯示應用。
實施例8
Figure 108112155-A0305-02-0022-169
Figure 108112155-A0305-02-0023-170
實施例8的液晶組合物具有合適的折射率和清亮點，高透過率，快速反應，結合IPS顯示模式的寬視角優勢，適用於智能手機等小尺寸顯示應用。
本發明雖然僅僅列舉了上述8個實施例的具體物質和配比質量百分比，並對組成的液晶組合物的性能進行了測試，但是本發明的液晶組合物可以在上述實施例的基礎上，利用本發明所涉及的通式I、II、III、VI、VII所代表的化合物、以及通式I、II、III、VI、VII的較佳的化合物進行進一步拓展和修改，均能達到本發明的目的。
Figure 108112155-A0305-02-0001-3

Claims (8)

  1. 一種正介電各向異性液晶組合物，其包含一種或多種式I所示的負性化合物、一種或多種式II所示的中性化合物以及一種或多種式III所示的化合物，
    Figure 108112155-A0305-02-0025-84
     式I中，R1表示環丙基、環丁基或環戊基；Z表示單鍵、-CH2-、-O-、-CH2CH2-或-CH2O-；R2表示氫原子、氟原子、碳原子數為1-7的烷基或碳原子數為1-7的烷氧基，X表示氧原子或硫原子；式II中，R3、R4各自獨立地表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基、氟取代的碳原子數為2-10的鏈烯基、碳原子數為3-8的鏈烯氧基或氟取代的碳原子數為3-8的鏈烯氧基，
    Figure 108112155-A0305-02-0025-85
    、
    Figure 108112155-A0305-02-0025-86
    各自獨立地表示
    Figure 108112155-A0305-02-0025-87
    或
    Figure 108112155-A0305-02-0025-88
    ；以及 該一種或多種式III所示的化合物係選自下述的式III-a-III-q所示化合物組成的群組：
    Figure 108112155-A0305-02-0025-89
    Figure 108112155-A0305-02-0025-90
    Figure 108112155-A0305-02-0025-91
    Figure 108112155-A0305-02-0026-92
    Figure 108112155-A0305-02-0026-93
    Figure 108112155-A0305-02-0026-94
    Figure 108112155-A0305-02-0026-95
    Figure 108112155-A0305-02-0026-96
    Figure 108112155-A0305-02-0026-97
    Figure 108112155-A0305-02-0026-98
    Figure 108112155-A0305-02-0026-99
    Figure 108112155-A0305-02-0026-100
    Figure 108112155-A0305-02-0026-101
    Figure 108112155-A0305-02-0026-102
    Figure 108112155-A0305-02-0027-103
    Figure 108112155-A0305-02-0027-104
    Figure 108112155-A0305-02-0027-105
     其中，R7表示碳原子數為1~10的直鏈烷基、
    Figure 108112155-A0305-02-0027-106
    、
    Figure 108112155-A0305-02-0027-107
    、
    Figure 108112155-A0305-02-0027-109
    、 碳原子數為1~10的烷氧基或碳原子數為2~10的鏈烯基；Y1表示F、未取代或者被F單取代或多取代的碳原子數1-6的烷基、未取代或者被F單取代或多取代的碳原子數1-6的烷氧基、未取代或者被F單取代或多取代的碳原子數2-6的鏈烯基；(F)表示氫或氟。
  2. 如請求項1所述的正介電各向異性液晶組合物，其中，該正介電各向異性液晶組合物中該一種或多種式I所示的負性化合物的總質量含量為1-30%，該一種或多種式II所示的中性化合物的總質量含量為20-80%。
  3. 如請求項1所述的正介電各向異性液晶組合物，其中，該式I所示的負性化合物選自式I1至式I24所示化合物組成的群組：
    Figure 108112155-A0305-02-0027-110
    Figure 108112155-A0305-02-0028-111
     該式II所示的中性化合物選自下述的式II1-式II3所示的化合物組成的群組：
    Figure 108112155-A0305-02-0028-113
     其中，D1、D2各自獨立地表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基、氟取代的碳原子數為2-10的鏈烯基、碳原子數為3-8的鏈烯氧基或氟取代的碳原子數為3-8的鏈烯氧基。
  4. 如請求項1-3中任一項所述的正介電各向異性液晶組合物，其進一步包含一種或多種式VI所示的化合物：
    Figure 108112155-A0305-02-0029-114
     式VI中，R11、R12各自獨立地表示碳原子數為1~10的直鏈烷基、
    Figure 108112155-A0305-02-0029-117
    、
    Figure 108112155-A0305-02-0029-121
    、
    Figure 108112155-A0305-02-0029-120
    、碳原子數為1~10的烷氧基或碳原子數為2~10的鏈烯基；
    Figure 108112155-A0305-02-0029-115
    、
    Figure 108112155-A0305-02-0029-116
    選自
    Figure 108112155-A0305-02-0029-179
    或
    Figure 108112155-A0305-02-0029-180
    所示的基團組成的群組，
    Figure 108112155-A0305-02-0029-181
    表示反式1,4-亞環己基、1,4-環己烯基基團，其中一個或多個不相鄰的-CH2-基團被-O-或-S-取代或未取代；
    Figure 108112155-A0305-02-0029-182
    表示1,4-亞苯基基團，其中一個或兩個-CH-被O取代或未取代，一個或兩個H被F取代或未取代；Z5表示氫或者酯基，c、d各自獨立地表示1或者2。
  5. 如請求項4所述的正介電各向異性液晶組合物，其中，該一種或多種式VI所示的化合物選自下述的式VI-a至式VI-e所示的化合物組成的群組：
    Figure 108112155-A0305-02-0029-122
    Figure 108112155-A0305-02-0029-123
    Figure 108112155-A0305-02-0029-124
    Figure 108112155-A0305-02-0030-125
    Figure 108112155-A0305-02-0030-126
     R11、R12各自獨立地表示碳原子數為1~10的直鏈烷基、
    Figure 108112155-A0305-02-0030-129
    、
    Figure 108112155-A0305-02-0030-130
    、
    Figure 108112155-A0305-02-0030-128
    、碳原子數為1~10的烷氧基或碳原子數為2~10的鏈烯基。
  6. 如請求項4所述的正介電各向異性液晶組合物，其進一步包含一種或多種式VII所示的化合物：
    Figure 108112155-A0305-02-0030-127
     式VII中，R13各自獨立地表示碳原子數為1~10的直鏈烷基、
    Figure 108112155-A0305-02-0030-131
    、
    Figure 108112155-A0305-02-0030-134
    、碳原子數為1~10的烷氧基、或碳原子數為 2~10的鏈烯基；R14表示碳原子數為1~5的直鏈烷基、或者氧原子與苯環相連的烷基醚；
    Figure 108112155-A0305-02-0030-136
    表示
    Figure 108112155-A0305-02-0030-183
    或
    Figure 108112155-A0305-02-0030-184
    所示基團中的任意一種或多種：
    Figure 108112155-A0305-02-0030-185
    表示反式1,4-亞環己基、1,4-環己烯基，其中一個或多個不相鄰的-CH2-基團被-O-或-S-取代或未取代；
    Figure 108112155-A0305-02-0030-186
    表示1,4-亞苯基基團，其中一個或兩個-CH-被N取代或未取代，一個或兩個H被F取代或未取代；Z3表示單鍵、-CH2-、-CH2-CH2-、-(CH2)3-、-(CH2)4-、-CH=CH-、-C≡C-、-COO-、-OOC-、-CF2O-、-OCH2-、-CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4-或-CF=CF-中的一種； d表示0、1或2；當d=2時，
    Figure 108112155-A0305-02-0030-138
    可以相同或不同。
  7. 如請求項6所述的正介電各向異性液晶組合物，其中，該一種或多種式VII所示的化合物選自下述的式VII-a-式VII-i所示的化合物組成的群組：
    Figure 108112155-A0305-02-0031-139
    Figure 108112155-A0305-02-0031-140
    Figure 108112155-A0305-02-0031-141
    Figure 108112155-A0305-02-0031-142
    Figure 108112155-A0305-02-0031-143
    Figure 108112155-A0305-02-0031-144
    Figure 108112155-A0305-02-0031-145
    Figure 108112155-A0305-02-0031-146
    Figure 108112155-A0305-02-0031-149
     其中，R13各自獨立地表示碳原子數為1~10的直鏈烷基
    Figure 108112155-A0305-02-0031-194
    、
    Figure 108112155-A0305-02-0031-150
    、
    Figure 108112155-A0305-02-0031-151
    、碳原子數為1~10的烷氧基或碳原子數為2~10的鏈烯 基；R14表示碳原子數為1~5的直鏈烷基、或者氧原子與苯環相連的烷基醚。
  8. 一種液晶顯示元件，其包括如請求項1-7中任一項所述的正介電各向異性液晶組合物，該液晶顯示元件為主動矩陣顯示元件或被動矩陣顯示元件。
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