TWI766251B - 液晶組合物、液晶顯示元件、液晶顯示器 - Google Patents
液晶組合物、液晶顯示元件、液晶顯示器 Download PDFInfo
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Abstract
本發明涉及液晶組合物,包含該液晶組合物的液晶顯示元件、液晶顯示器,屬於液晶顯示領域。本發明的液晶組合物,包含式I所示的化合物,以及一種或多種式II所示的化合物,該液晶組合物可以增大介電各向異性、提高電壓保持率。
Description
本發明屬於液晶顯示領域,更具體地,涉及液晶組合物及包含該液晶組合物的液晶顯示元件、液晶顯示器。
顯示是把電信號(資料資訊)轉變為可視光(視覺資訊)的過程,平板顯示器(Flat Panel Display,FPD)是目前最為流行的一類顯示裝置。液晶顯示器(Liquid Crystal Display,LCD)是FPD中最早被開發出來,並被商品化的產品。目前,薄膜電晶體液晶顯示器(Thin Film Transistor Liquid Crystal,TFT-LCD)已經成為LCD應用中的主流產品。
TFT-LCD的發展經歷了漫長的基礎研究階段,在實現大生產,商業化之後,TFT-LCD產品以其輕薄、環保、高性能等優點,迅速得到市場的認可,其逐漸向大尺寸和多種類應用發展。無論是小尺寸的手機屏、大尺寸的筆記型電腦(Notebook PC)或監視器(Monitor),以及大型化的液晶電視(LCDTV),到處可見TFT-LCD的應用。TFT-LCD可分為三大類,分別是扭曲向列/超扭曲向列(TN/STN)型、平面轉換(IPS)型,及垂直配向(VA)型。早期商用的TFT-LCD產品基本採用了扭曲向列(Twisted Nematic,TN)型顯示模式,其最大問題是視角不夠大。隨著TFT-LCD產品尺寸的增加,特別是TFT-LCD在TV領域的應用,具有廣視野角特點的面內切換(In-PlaneSwiching,IPS)顯示模式被開發出來並加以運
用。IPS顯示模式最早由美國人R.Soref(索裡夫)在1974年以論文形式發表,並由德國人G.Baur(鮑爾)提出將其作為廣視角技術應用於TFTLCD。1995年,日本日立公司開發出了世界首款13.3寸IPS模式的廣視野角TFT-LCD產品。
VA型液晶顯示器相對其他種類的液晶顯示器具有極高的對比度,是因為在不加電的暗態時,液晶分子垂直於基板表面排列,不產生任何相位差,漏光極低,暗態亮度很小,對比度很高,使其在大尺寸顯示,如電視等方面具有非常廣的應用。然而,現有技術中的液晶顯示器回應速度不夠快、閾值電壓不夠低、電壓保持率不夠高、離子密度不夠低、顯示良品率較低已經成為顯示器達到更高性能規格的主要障礙,改進上述各項指標也是各器件廠商一直追求的目標。
為了解決現有技術中存在的問題,本發明人等進行深入研究後發現,通過使用本發明的液晶組合物,可以增大液晶材料介電各向異性、提高電壓保持率。
本發明的另一目的在於提供一種液晶顯示元件,其包含本發明的液晶組合物,該液晶顯示元件具有快的回應速度。
本發明的再一目的在於提供一種液晶顯示器,其包含本發明的液晶組合物,該液晶顯示器具有快的回應速度。
式II中,R1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,或者氟取代的碳原子數為1-10的烷氧基;R1所示基團中任意一個或多個不相連的-CH2-任選被亞環戊基、亞環丁基或亞環丙基取代;R2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,或者氟取代的碳原子數為1-10的烷氧基。
本發明還提供液晶顯示元件,其包含本發明的液晶組合物,所述液晶顯示元件為有源矩陣定址顯示元件或者無源矩陣定址顯示元件。
本發明還提供液晶顯示器,其包含本發明的液晶組合物,所述液晶顯示器為有源矩陣定址顯示器或者無源矩陣定址顯示器。
本發明的有益效果在於,本發明的液晶組合物具有較大的液晶材料介電各向異性、較高的電壓保持率。包含該液晶組合物的液晶顯示元件、液晶顯示器具有快的回應速度,進而實現提高液晶顯示器性能的效果。
具體實施方式
[液晶組合物]
本發明的液晶組合物能夠增大介電各向異性和提高電壓保持率,包含該液晶組合物的液晶顯示元件、液晶顯示器具有低驅動電壓、快的回應速度。
作為前述碳原子數為1-10的烷基,可以列舉出例如,甲基、乙基、正丙基、異丙基、正丁基、異丁基、叔丁基、正戊基、異戊基、己基、庚基、辛基、壬基、癸基等。
作為前述的碳原子數為1-10的烷氧基,可以列舉出例如,甲氧基、乙氧基、正丙氧基、異丙氧基、正丁氧基、異丁氧基、戊氧基、己氧基、庚氧基、辛氧基、壬氧基、癸氧基等。
前述的氟取代的碳原子數為1-10的烷基、氟取代的碳原子數為2-10的鏈烯基中的“氟取代”可以是單氟取代,或者、二氟取代、三氟取代等多氟取代,
也可以是全氟取代,對氟的取代數沒有特別的限定。例如,作為氟取代的碳原子數為1-10的烷基,可以列舉出氟代甲基、二氟甲基、三氟甲基、1-氟代乙基、2-氟代乙基、1,2-二氟乙基、1,1-二氟乙基、1,1,2-三氟乙基、1,1,1,2,2-五氟取代乙基等但不限於此。
本發明的液晶組合物中,根據一實施例,還包含一種或多種式III所示化合物:
式III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,或者氟取代的碳原子數為3-8的鏈烯氧基;R3、R4所示基團中任意一個或多個不相連的-CH2-任選被亞環戊基、亞環丁基或亞環丙基取代;作為前述亞環戊基、亞環丁基,可以列舉出例如,1,2-亞環戊基,1,3-亞環戊基,1,2-亞環丁基,1,3-亞環丁基;Z1、Z2各自獨立地表示單鍵、-CH2CH2-、-OCH2-或-CH2O-;、各自獨立地表示1,4-亞環己基、1,4-亞環己烯基、1,4-亞苯基或氟代1,4-亞苯基;m表示0或1;n表示0、1或2。
前述的式III所示化合物具有負介電各項異性,通過在本發明的液晶組合物中含有式III所示化合物,可以調節液晶組合物的驅動電壓。
本發明的液晶組合物依據一實施例還包含一種或多種式IV所示化合物:
其中,R5、R6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,或者氟取代的碳原子數為2-10的鏈烯基;、各自獨立地表示1,4-亞環己基、1,4-亞環己烯基或1,4-亞苯基。
通過在本發明的液晶組合物中含有式IV所示化合物,能夠降低液晶組合物的互溶性,降低旋轉黏度,從而提高本發明的液晶組合物的回應速度。
本發明的液晶組合物,根據一實施例,前述液晶組合物還包含一種或多種除所述式I所示化合物之外的式V所示化合物:
其中,
R7、R8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,或者氟取代的碳原子數為2-10的鏈烯基;、各自獨立地表示1,4-亞環己基、1,4-亞環己烯基或1,4-亞苯基。
通過在本發明的液晶組合物中含有式V所示化合物,能夠增大液晶組合物的光學各向異性和提高液晶組合物的清亮點,有利於提升液晶組合物的回應速度。
本發明的液晶組合物中,依據一實施例還包含一種或多種式VI所示化合物:
其中,
R9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,或者氟取代的碳原子數為1-10的烷氧基,這些基團中任意一個或多個不相連的-CH2-任選被亞環戊基、亞環丁基或亞環丙基取代;作為前述亞環戊基、亞環丁基,可以列舉出例如,1,2-亞環戊基,1,3-亞環戊基,1,2-亞環丁基,1,3-亞環丁基;R10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,或者氟取代的碳原子數為1-10的烷氧基。
通過在本發明的液晶組合物中含有前述的式VI所示化合物,能夠使液晶組合物具有較大的負的介電各向異性,有利於降低器件的驅動電壓。
本發明的液晶組合物中,式I所示化合物在液晶組合物中的添加量(品質比)為1-15%,依據一實施例為3-11%;式II所示化合物在液晶組合物中的添加量(品質比)為1-30%,依據另一實施例為8-20%;式III所示化合物在液晶組合物中的添加量(品質比)為0-50%,依據又一實施例為20-40%;式IV所示化合物在液晶組合物中的添加量(品質比)為0-60%,依據又一實施例為35-50%;式V所示化合物在液晶組合物中的添加量(品質比)為0-35%,依據又一實施例為12-25%;式VI所示化合物在液晶組合物中的添加量(品質比)為0-10%。
本發明的液晶組合物中,依據一實施例,還可以加入各種功能的摻雜劑,在含有摻雜劑的情況下,摻雜劑的含量在液晶組合物中所占的品質百分比為0.01-1.5%,這些摻雜劑可以列舉出例如抗氧化劑、紫外線吸收劑、手性劑。
抗氧化劑可以列舉出,
t表示1-10的整數;手性劑可以列舉出,
R表示碳原子數為1-10的烷基;
光穩定劑可以列舉出,
Z0表示碳數為1-20的亞烷基,所述亞烷基中任意的一個或多個氫任選被鹵素取代,任意的一個或多個不相鄰-CH2-任選被-O-取代;紫外線吸收劑可以列舉出,
R01表示碳原子數為1-10的烷基。
[液晶顯示元件或液晶顯示器]
本發明還涉及包含上述任意一種液晶組合物的液晶顯示元件或液晶顯示器;所述顯示元件或顯示器為有源矩陣顯示元件或顯示器或無源矩陣顯示元件或顯示器。
依據一實施例,所述液晶顯示元件或液晶顯示器有源矩陣液晶顯示元件或液晶顯示器。
依據一實施例,所述有源矩陣顯示元件或顯示器為IPS-TFT、FFS-TFT、VA-TFT液晶顯示元件或顯示器。
包含前述的化合物或液晶組合物的液晶顯示元件或液晶顯示器,具有低的驅動電壓、高的電壓保持率、快速的回應速度。
實施例
為了更清楚地說明本發明,下面結合實施例對本發明做進一步的說明。本領域技術人員應當理解,下面所具體描述的內容是說明性的而非限制性的,不應以此限制本發明的保護範圍。
本說明書中,如無特殊說明,百分比均是指品質百分比,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;△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微米垂直盒,INSTEC:ALCT-IR1測試;γ1表示旋轉黏度(mPa‧s),測試條件為25±0.5℃,20微米垂直盒,INSTEC:ALCT-IR1測試;K11為扭曲彈性常數,K33為展曲彈性常數,測試條件為:25℃、INSTEC:ALCT-IR1、20微米垂直盒;液晶組合物的製備方法如下:將各液晶單體按照一定配比稱量後放入不銹鋼燒杯中,將裝有各液晶單體的不銹鋼燒杯置於磁力攪拌儀器上加熱融化,待不銹鋼燒杯中的液晶單體大部份融化後,往不銹鋼燒杯中加入磁力轉子,將混合物攪拌均勻,冷卻到室溫後即得液晶組合物。
本發明實施例液晶單體結構用代碼表示,液晶環結構、端基、連接基團的代碼表示方法見下表1、表2。
舉例:,其代碼為CC-Cp-V1;
,其代碼為CPY-2-O2;
,其代碼為CCY-3-O2;
,其代碼為COY-3-O2;
,其代碼為CCOY-3-O2;
,其代碼為Sb-CpO-O4;
,其代碼為Sc-CpO-O4。
實施例1
液晶組合物的配方及相應的性能如下表3所示。
實施例2
液晶組合物的配方及相應的性能如下表4所示。
實施例3
液晶組合物的配方及相應的性能如下表5所示。
實施例4
液晶組合物的配方及相應的性能如下表6所示。
對比例1
液晶組合物的配方及相應的性能如下表7所示。
將實施例4中的Sc-CpO-O4、Sc-CpO-O2分別替換為PY-2O-O2、PY-3-O2,其餘與實施例4相同,作為對比例1。與對比例1相比,實施例4的液晶
組合物的具有大的介電各向異性(△ε)、高的清亮點(Cp),可以用於開發大介電寬溫顯示的液晶顯示器。
液晶組合物的信賴性通過紫外、高溫老化試驗並進行VHR測試來進行。
液晶組合物紫外、高溫試驗前後的VHR資料變化越小,抗紫外、抗高溫能力越強。因此,通過比較各個實施例、比較例在試驗前後的VHR資料的差來判斷抗紫外、抗高溫能力。
首先,在進行紫外、高溫老化試驗之前,測定液晶組合物的VHR資料作為初始VHR資料,然後,對液晶組合物進行紫外、高溫老化試驗,在試驗後再次測定液晶組合物的VHR資料。
紫外老化試驗:將液晶組合物放置在波長為365nm的紫外燈下照射5000mJ能量。
高溫老化試驗:將液晶組合物放置在100℃烘箱內一小時。
在老化試驗後VHR資料相對於初始VHR資料變化越小,說明該液晶組合物抗紫外、抗高溫的能力越強,從而可以判斷該液晶組合物在工作過程中抵抗外界環境破壞的能力越強,因此,該液晶組合物的信賴性就越高。
另外,將實施例4、對比例1液晶組合物灌注入液晶測試盒,進行殘像測試,測試結果一併示於上述的表8中。
由表8可以看出,本發明的液晶組合物的抗UV、抗高溫性能是非常明顯的。由此說明,本發明的液晶組合物具有良好的抗UV、抗高溫的性能。
實施例5
液晶組合物的配方及相應的性能如下表9所示。
實施例6
液晶組合物的配方及相應的性能如下表10所示。
實施例7
液晶組合物的配方及相應的性能如下表11所示。
實施例8
液晶組合物的配方及相應的性能如下表12所示。
實施例9
液晶組合物的配方及相應的性能如下表13所示。
顯然,本發明的上述實施例僅僅是為清楚地說明本發明所作的舉例,而並非是對本發明的實施方式的限定,對於所屬領域的普通技術人員來說,在上述說明的基礎上還可以做出其它不同形式的變化或變動,這裡無法對所有的實施方式予以窮舉,凡是屬於本發明的技術方案所引伸出的顯而易見的變化或變動仍處於本發明的保護範圍之列。
Claims (10)
- 一種液晶組合物,包含式I所示的化合物,代碼Sc-2O-O4所示的化合物,代碼LY-Cp-O2所示的化合物,式III-3、III-4、III-11所示的化合物,式IV-1所示的化合物,式V-1所示的化合物,以及式VI-6所示的化合物,
- 如請求項1所述的液晶組合物,更包含一種或多種式III所示化合物,
- 一種液晶顯示元件或液晶顯示器,包含請求項1-9的任一項所述的液晶組合物,所述液晶顯示元件或液晶顯示器為有源矩陣定址顯示元件或顯示器,或者無源矩陣定址顯示元件或顯示器。
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