JP2513263B2 - Liquid crystal composition - Google Patents
Liquid crystal compositionInfo
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- JP2513263B2 JP2513263B2 JP62334698A JP33469887A JP2513263B2 JP 2513263 B2 JP2513263 B2 JP 2513263B2 JP 62334698 A JP62334698 A JP 62334698A JP 33469887 A JP33469887 A JP 33469887A JP 2513263 B2 JP2513263 B2 JP 2513263B2
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Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、テレビ画像表示様電界効果型液晶表示素
子に用いられる液晶組成物に係り、特には、時分割駆動
をおこなうのに好適な液晶組成物に関する。Description: TECHNICAL FIELD The present invention relates to a liquid crystal composition used in a television image display-like field effect liquid crystal display element, and particularly to a liquid crystal suitable for performing time division driving. It relates to a composition.
［従来の技術および問題点］ マトリックス型表示方式による液晶表示素子を用いた
テレビ画像表示装置は、近年、さらに大型化し、その画
質向上に対する要求はきわめて強く、液晶表示素子のコ
ントラストや画素数の向上が望まれている。[Prior Art and Problems] In recent years, a television image display device using a liquid crystal display element by a matrix type display has been further increased in size, and there is a strong demand for improving the image quality thereof. Therefore, the contrast and the number of pixels of the liquid crystal display element are improved. Is desired.
上記タイプの液晶表示素子の画素数を増すために、さ
らに高時分割駆動させることにより表示容量を増加しよ
うとすると、動作マージンが低下してコントラストの低
下をもたらす。If an attempt is made to increase the display capacity by further driving the liquid crystal display element of the type described above in a high time division manner, the operation margin is lowered and the contrast is lowered.
これを解決するためには、液晶組成物の閾値特性を急
峻にする必要がある。In order to solve this, it is necessary to make the threshold characteristic of the liquid crystal composition steep.
M.Schadtらの報告（Z.Naturforsch,37a,165（1982）
およびProceedings of the SID 23（１）,29（1982））
によれば、液晶の光透過率が50％になる電圧をV50、90
％になる電圧をV90とすると（V50−V90）/V90で定義さ
れる値Ｐが最小値を示すときに、時分割特性が最もよく
なり、かつ急峻なγ特性が得られ、コントラストがよく
なる。ところで、Ｐは式 ｛ここで、Δｎ＝n11−ｎ⊥：屈折率異方性 K33:曲り弾性定数 K11:スプレイ弾性定数 ｄ＝液晶層の厚さ（μｍ）｝ で近似的に表わされる。Report by M. Schadt et al. (Z. Naturforsch, 37a, 165 (1982)
And Proceedings of the SID 23 (1), 29 (1982))
According to the report, the voltage at which the light transmittance of the liquid crystal is 50% is V50, 90.
Assuming that the voltage that becomes% is V90, when the value P defined by (V50-V90) / V90 shows the minimum value, the time division characteristic becomes the best, the steep γ characteristic is obtained, and the contrast becomes good. By the way, P is an expression {Wherein Δn = n 11 −n ⊥ : refractive index anisotropy K33: bending elastic constant K11: spray elastic constant d = thickness of liquid crystal layer (μm)}.
上記式から明らかなように、K33/K11＜１および右辺
第３項が０のときＰは最小値を示す。また可視光線のほ
ぼ中心の波長550nmをλとすれば、Δｎ・ｄ（μｍ）＝
1.1のときＰは最小となり、γ特性が最も急峻となる。As is clear from the above equation, when K33 / K11 <1 and the third term on the right side is 0, P shows the minimum value. If the wavelength 550 nm at the center of visible light is λ, Δn · d (μm) =
When 1.1, P is the smallest and the γ characteristic is the steepest.
そこで、従来の液晶セルは液晶化合物の屈折率異方性
がΔｎ＝0.16程度であるため、液晶層厚をほぼ7.0μｍ
以上に設定しなければならない。Therefore, in the conventional liquid crystal cell, since the refractive index anisotropy of the liquid crystal compound is about Δn = 0.16, the liquid crystal layer thickness is about 7.0 μm.
Must be set above.
また、γ特性が急峻で、コントラストが高い液晶組成
物を得るべく弾性定数比K33/K11を小さくする必要があ
る。Further, it is necessary to reduce the elastic constant ratio K33 / K11 in order to obtain a liquid crystal composition having a sharp γ characteristic and a high contrast.
上記弾性定数比が小さい液晶化合物として、ピリミジ
ン系液晶化合物が知られており、その弾性定数比は、1.
0未満である。このため、ピリミジン系液晶化合物は、
従来ワードプロセッサー用等ある程度高時分割駆動を要
求される液晶表示素子の液晶組成物に用いられてきた
が、同様な高時分割駆動が要求されるテレビ画像表示用
には用いることができなかった。これは、テレビ画像と
しては、高速応答性が要求されるため、粘度の高い（40
cP以上）ピリミジン系液晶化合物は適さないためであ
る。また、一般に、テレビ画像表示用として高速応答性
に優れた低粘度の液晶化合物の弾性定数比の値は大き
く、急峻なγ特性が得られない。As a liquid crystal compound having a small elastic constant ratio, a pyrimidine-based liquid crystal compound is known, and its elastic constant ratio is 1.
It is less than 0. Therefore, the pyrimidine-based liquid crystal compound is
Conventionally, it has been used for a liquid crystal composition of a liquid crystal display device which requires a certain time-division driving such as for a word processor, but it cannot be used for a television image display which requires a similar high time-division driving. This is because high-speed response is required for TV images, so high viscosity (40
This is because pyrimidine-based liquid crystal compounds are not suitable. Further, in general, a low viscosity liquid crystal compound excellent in high-speed response for displaying a television image has a large elastic constant ratio, and a steep γ characteristic cannot be obtained.
また、液晶層厚（ｄ）を小さくして電界強度を大きく
することによって応答特性を改善しようとすると、急峻
なγ特性を得るための条件（Δｎ・ｄ＝1.1）を満足で
きなくなるのである。Further, if an attempt is made to improve the response characteristic by decreasing the liquid crystal layer thickness (d) and increasing the electric field strength, the condition (Δn · d = 1.1) for obtaining a steep γ characteristic cannot be satisfied.
したがって、この発明の目的は、高時分割駆動した場
合に良好なコントラストと高速応答を可能にする、テレ
ビ画像表示用電界効果型液晶表示素子を実現できる液晶
組成物を提供することにある。Therefore, an object of the present invention is to provide a liquid crystal composition capable of realizing a field effect liquid crystal display device for television image display, which enables good contrast and high-speed response when driven in a high time division manner.
［問題点を解決するための手段］ この発明は、上記目的を達成するために、Δｎが大き
い液晶材料と、弾性定数比の小さい液晶材料と、低粘度
液晶材料と、Δεの大きい液晶材料を配合している。こ
のような配合の液晶組成物は、弾性定数比の小さい液晶
化合物を用いることによりγ特性が向上し、低粘度であ
りながら大きな屈折率異方性を有する液晶化合物を用い
ることによる急峻なγ特性の得られる条件が液晶層厚
（ｄ）を小さくしても実現できるため、高速応答が可能
になる。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a liquid crystal material having a large Δn, a liquid crystal material having a small elastic constant ratio, a low viscosity liquid crystal material, and a liquid crystal material having a large Δε. It is compounded. The liquid crystal composition having such a composition has improved γ characteristics by using a liquid crystal compound having a small elastic constant ratio, and has a sharp γ characteristic by using a liquid crystal compound having a low viscosity and a large refractive index anisotropy. Since the condition of (1) can be realized even if the liquid crystal layer thickness (d) is reduced, high-speed response becomes possible.
すなわち、この発明の液晶組成物は、 式 （ここで、R1は炭素数２〜５の直鎖アルキル基、R2は炭
素数１〜５の直鎖アルキル）で示される液晶化合物、 式 （ここで、R3は炭素数２〜５の直鎖アルキル基、R4は炭
素数１〜５の直鎖アルキル） で示される液晶化合物、および式 （ここで、R5およびR6はそれぞれ炭素数１〜５の直鎖ア
ルキル基）で示される液晶化合物のうち式（Ｉ）で示さ
れる液晶化合物の少なくとも１種以上を含む第１の液晶
材料を30〜60重量％、 式 （ここで、R7は炭素数６〜９の直鎖アルキル基、R8は炭
素数５〜11の直鎖アルキル基）で示される液晶化合物か
らなる第２の液晶材料を10〜40重量％、 式 （ここで、R9は炭素数２〜５の直鎖アルキル基、R10は
炭素数１〜４の直鎖アルキル基）で示される液晶化合物
および式 （ここで、R11は炭素数１〜３の直鎖アルキル基）で示
される液晶化合物から選ばれた少なくとも１種からなる
第３の液晶化合物を20重量％以下、 式 （ここで、R12は炭素数２〜３の直鎖アルキル基、R13は
炭素数２〜５の直鎖アルキル基もしくは直鎖アルコキシ
基）で示される液晶化合物および式 （ここで、R14は炭素数２〜４の直鎖アルキル基）で示
される液晶化合物のうち式（VII）で示される液晶化合
物の少なくとも１種を含む第４の液晶材料を10〜40重量
％、並びに 式 （ここで、R15は炭素数２〜５の直鎖アルキル基）およ
び式 （ここで、R16は炭素数２〜５の直鎖アルキル基）から
選ばれた少なくとも１種からなる第５の液晶材料を５〜
30重量％ の割合で、かつ液晶組成物誘電異方性が正となるように
それぞれ配合したことを特徴とする液晶組成物である。That is, the liquid crystal composition of the present invention has the formula (Wherein R 1 is a linear alkyl group having 2 to 5 carbon atoms, R 2 is a linear alkyl group having 1 to 5 carbon atoms), a liquid crystal compound represented by the formula: (Wherein R 3 is a linear alkyl group having 2 to 5 carbon atoms, and R 4 is a linear alkyl group having 1 to 5 carbon atoms), and a liquid crystal compound represented by the formula: (Wherein R 5 and R 6 are each a linear alkyl group having 1 to 5 carbon atoms), and a first liquid crystal material containing at least one liquid crystal compound represented by formula (I) 30-60% by weight, formula (Wherein R 7 is a straight-chain alkyl group having 6 to 9 carbon atoms and R 8 is a straight-chain alkyl group having 5 to 11 carbon atoms), and the second liquid crystal material is 10 to 40% by weight. , Expression (Wherein R 9 is a linear alkyl group having 2 to 5 carbon atoms, and R 10 is a linear alkyl group having 1 to 4 carbon atoms), and a liquid crystal compound and a formula (Wherein R 11 is a straight-chain alkyl group having 1 to 3 carbon atoms), 20 wt% or less of a third liquid crystal compound consisting of at least one selected from liquid crystal compounds represented by the formula: (Wherein R 12 is a linear alkyl group having 2 to 3 carbon atoms, and R 13 is a linear alkyl group or linear alkoxy group having 2 to 5 carbon atoms) and a liquid crystal compound and a formula. (Wherein, R 14 is a linear alkyl group having 2 to 4 carbon atoms), and 10 to 40 wt% of a fourth liquid crystal material containing at least one liquid crystal compound of the formula (VII) %, And expression (Wherein R 15 is a linear alkyl group having 2 to 5 carbon atoms) and a formula (Wherein R 16 is a linear alkyl group having 2 to 5 carbon atoms) and a fifth liquid crystal material of at least one selected from 5
The liquid crystal composition is characterized in that it is blended in a proportion of 30% by weight and the liquid crystal composition has a positive dielectric anisotropy.
一般式（Ｉ）の化合物は、Δｎが大きく（0.2以
上）、低粘度であり（約20cP）、Ｎ−Ｉ点が高い（70〜
96℃）。The compound of the general formula (I) has a large Δn (0.2 or more), a low viscosity (about 20 cP), and a high NI point (70-
96 ° C).
一般式（II）の化合物は、Δｎが大きく（0.18以
上）、低粘度である（15cP以下）。The compound of the general formula (II) has a large Δn (0.18 or more) and a low viscosity (15 cP or less).
一般式（III）の化合物は、弾性定数比が比較的小さ
く、低粘度であり（14〜17cP）、Ｎ−Ｉ点が高い（70〜
80℃）。The compound of the general formula (III) has a relatively small elastic constant ratio, a low viscosity (14 to 17 cP), and a high NI point (70 to 70%).
80 ° C).
一般式（Ｉ）〜（III）で示される液晶化合物によっ
て構成される第１の液晶材料は液晶組成物のΔｎを大き
くするためのものであり、そのうち、一般式（Ｉ）の化
合物は、特にΔｎが高いので必ず配合される。一般式
（II）の化合物は、特にΔｎを大きくする場合に配合さ
れ、一般式（III）の化合物は特に弾性定数比を小さく
する場合に配合される。The first liquid crystal material composed of the liquid crystal compounds represented by the general formulas (I) to (III) is for increasing Δn of the liquid crystal composition, and among them, the compound of the general formula (I) is particularly preferable. Since Δn is high, it is always blended. The compound of the general formula (II) is added especially when increasing Δn, and the compound of the general formula (III) is added particularly when decreasing the elastic constant ratio.
一般式（IV）の化合物の粘度は高い（40cP以上）が、
弾性定数比が小さい（0.7〜0.5）。また、R7およびR8の
炭素数が少ない程融点が低く、弾性定数比が大きくな
り、また粘度が低くなる。したがって、液晶温度範囲を
広げ、応答速度を速める場合にはR7およびR8の炭素数の
小さいものを用い、他方、γ特性の向上を重視した場合
はR7およびR8の炭素数が多いものを用いることが好まし
い。The compound of general formula (IV) has a high viscosity (40 cP or more),
Small elastic constant ratio (0.7 to 0.5). Further, the lower the carbon number of R 7 and R 8, the lower the melting point, the larger the elastic constant ratio, and the lower the viscosity. Therefore, when the liquid crystal temperature range is widened and the response speed is increased, R 7 and R 8 having a small carbon number are used. On the other hand, when the improvement in the γ characteristic is emphasized, R 7 and R 8 are large in carbon number. It is preferable to use one.
一般式（IV）の化合物からなる第２の液晶材料は、弾
性定数比を小さくするためのものである。The second liquid crystal material made of the compound of the general formula (IV) is for reducing the elastic constant ratio.
一般式（Ｖ）の化合物は、Ｎ−Ｉ点が高く（190〜210
℃）、Δｎが大きい（0.2以上）。The compound of the general formula (V) has a high NI point (190 to 210).
℃), Δn is large (0.2 or more).
一般式（VI）の化合物は、Ｎ−Ｉ点が高く（160〜180
℃）、比較的低粘度である（20〜25cP）。The compound of general formula (VI) has a high NI point (160 to 180).
℃), relatively low viscosity (20-25cP).
一般式（Ｖ）および（IV）の化合物によって構成され
る第３の液晶材料は、一般にＮ−Ｉ点を高くするための
高温液晶材料であり、その内、一般式（Ｖ）の化合物は
特にΔｎをさらに大きくする場合に用いられ、また一般
式（VI）の化合物は、低粘度であるために応答速度の向
上を目的とした場合に用いられる。The third liquid crystal material composed of the compounds of the general formulas (V) and (IV) is generally a high temperature liquid crystal material for increasing the NI point, and among them, the compound of the general formula (V) is particularly preferable. It is used for further increasing Δn, and the compound of the general formula (VI) is used for the purpose of improving the response speed because of its low viscosity.
一般式（VII）の化合物は低粘度であり（４〜10c
P）、Δｎは0.09程度である。The compound of general formula (VII) has a low viscosity (4-10c).
P) and Δn are about 0.09.
一般式（VIII）の化合物は低粘度であり（10〜15c
P）、融点が低く（−28〜−30℃）、Δεが正（３〜
６）である。The compound of general formula (VIII) has a low viscosity (10-15c
P), melting point is low (-28 to -30 ° C), Δε is positive (3 to
6).
一般式（VII）および（VIII）の化合物によって構成
される第４の液晶材料は、一般に粘度を低下されるため
の低粘度液晶であり、その内一般式（VII）の化合物は
粘度低下のために必ず配合される。一般式（VIII）の化
合物はΔεが正でありかつ融点が低いことから、駆動電
圧を低くし、また液晶温度範囲を低温側に広げる場合に
用いられる。The fourth liquid crystal material composed of the compounds of the general formulas (VII) and (VIII) is generally a low-viscosity liquid crystal for decreasing the viscosity, of which the compound of the general formula (VII) is for decreasing the viscosity. Must be included in. Since the compound of the general formula (VIII) has a positive Δε and a low melting point, it is used for lowering the driving voltage and widening the liquid crystal temperature range to the low temperature side.
一般式（IX）の化合物は、Δεが正に大きく（10〜1
2）、低粘度である（20〜25cP）が、Δｎは小さい（0.1
3程度）。The compound of the general formula (IX) has a positively large Δε (10 to 1
2), low viscosity (20-25cP), but small Δn (0.1
About 3).
一般式（Ｘ）の化合物は、Δεが正に大きく（13程
度）、Δｎが大きく（0.20程度）、低粘度である（22〜
30cP）。The compound of the general formula (X) has a large positive Δε (about 13), a large Δn (about 0.20), and a low viscosity (22-
30cP).
一般式（IX）および（Ｘ）の化合物によって構成され
る第５の液晶材料は、Δεを大きくするためのｐ型液晶
材料である。一般式（IX）の化合物は、Δεを大きくし
て駆動電圧を低下させることを重視した場合に配合さ
れ、多量に加えてもＮ−Ｉ点を著しく低下させることは
ない。一般式（Ｘ）の化合物は、特に、Δｎを大きくす
ることを重視した場合に配合される。The fifth liquid crystal material composed of the compounds of the general formulas (IX) and (X) is a p-type liquid crystal material for increasing Δε. The compound of the general formula (IX) is blended in the case where it is important to increase Δε to reduce the driving voltage, and even if added in a large amount, the NI point is not significantly lowered. The compound of the general formula (X) is mixed especially when it is important to increase Δn.
さて、各液晶材料の配合割合は、上記の通りである
が、一般に、第１の液晶材料のうち、式（Ｉ）で示され
る液晶化合物が30〜50重量％の割合で、式（II）で示さ
れる液晶化合物が０〜20重量％の割合で、および式（II
I）で示される液晶化合物が０〜30重量％の割合で配合
され、第３の液晶材料のうち、式（Ｖ）で示される液晶
化合物が０〜20重量％の割合で、および式（VI）で示さ
れる液晶化合物が０〜20重量％の割合で配合され、第４
の液晶材料のうち、式（VII）で示される液晶化合物が
５〜40重量％の割合で、および式（VIII）で示される液
晶化合物が０〜20重量％の割合で配合され、第５の液晶
材料のうち、式（IX）で示される液晶化合物が０〜20重
量％の割合で、および式（Ｘ）で示される液晶化合物が
０〜15重量％の割合で配合される。The mixing ratio of each liquid crystal material is as described above. Generally, the ratio of the liquid crystal compound represented by the formula (I) is 30 to 50% by weight in the formula (II) in the first liquid crystal material. The liquid crystal compound represented by the formula (II
The liquid crystal compound represented by the formula (I) is blended in a proportion of 0 to 30% by weight, and in the third liquid crystal material, the liquid crystal compound represented by the formula (V) is blended in a proportion of 0 to 20% by weight, and in the formula (VI). ) Is compounded in a proportion of 0 to 20% by weight,
The liquid crystal compound represented by the formula (VII) in an amount of 5 to 40% by weight and the liquid crystal compound represented by the formula (VIII) in an amount of 0 to 20% by weight. In the liquid crystal material, the liquid crystal compound represented by the formula (IX) is blended in a proportion of 0 to 20% by weight, and the liquid crystal compound represented by the formula (X) is blended in a proportion of 0 to 15% by weight.
また、この発明の好ましい態様において、一般式
（Ｉ）で示される液晶化合物を25〜35重量％、一般式
（II）で示される液晶化合物を５〜15重量％、一般式
（III）で示される液晶化合物を５〜15重量％、一般式
（IV）で示される液晶化合物を15〜30重量％、一般式
（Ｖ）で示される液晶化合物を５〜10重量％、一般式
（VI）で示される液晶化合物を５〜15重量％、一般式
（VII）で示される液晶化合物を10〜30重量％、一般式
（VIII）で示される液晶化合物を５〜15重量％、一般式
（IX）で示される液晶化合物を５〜15重量％、および一
般式（Ｘ）で示される液晶化合物を３〜８重量％の割合
で配合する。In a preferred embodiment of the present invention, the liquid crystal compound represented by the general formula (I) is 25 to 35% by weight, the liquid crystal compound represented by the general formula (II) is 5 to 15% by weight, and the liquid crystal compound is represented by the general formula (III). The liquid crystal compound represented by the general formula (IV) is 5 to 15% by weight, the liquid crystal compound represented by the general formula (V) is 5 to 10% by weight, and the liquid crystal compound is represented by the general formula (VI). 5 to 15% by weight of the liquid crystal compound represented, 10 to 30% by weight of the liquid crystal compound represented by the general formula (VII), 5 to 15% by weight of the liquid crystal compound represented by the general formula (VIII), and the general formula (IX) 5 to 15% by weight of the liquid crystal compound represented by the formula (3) and 3 to 8% by weight of the liquid crystal compound represented by the general formula (X) are mixed.
さらに他の態様において、一般式（Ｉ）で示される液
晶化合物を30〜32重量％、一般式（II）で示される液晶
化合物を０〜12重量％、一般式（III）で示される液晶
化合物を０〜29重量％、一般式（IV）で示される液晶化
合物を10〜26重量％、一般式（Ｖ）で示される液晶化合
物を０〜７重量％、一般式（VI）で示される液晶化合物
を０〜15重量％、一般式（VII）で示される液晶化合物
を10〜30重量％、一般式（VIII）で示される液晶化合物
を０〜10重量％、一般式（IX）で示される液晶化合物を
０〜15重量％、および一般式（Ｘ）で示される液晶化合
物を０〜８重量％の割合で配合する。In still another embodiment, the liquid crystal compound represented by the general formula (I) is 30 to 32% by weight, the liquid crystal compound represented by the general formula (II) is 0 to 12% by weight, and the liquid crystal compound represented by the general formula (III) is Is 0 to 29% by weight, the liquid crystal compound represented by the general formula (IV) is 10 to 26% by weight, the liquid crystal compound represented by the general formula (V) is 0 to 7% by weight, and the liquid crystal represented by the general formula (VI) is 0 to 15% by weight of compound, 10 to 30% by weight of liquid crystal compound represented by general formula (VII), 0 to 10% by weight of liquid crystal compound represented by general formula (VIII), represented by general formula (IX) The liquid crystal compound is blended in a proportion of 0 to 15% by weight, and the liquid crystal compound represented by the general formula (X) is blended in a proportion of 0 to 8% by weight.
［実施例］ 以下、この発明の実施例を記載する。[Examples] Examples of the present invention will be described below.
実施例１〜５、従来例１〜２ 下記表１に示す液晶化合物を同表に示す割合で配合し
各種液晶組成物を調製した。各液晶組成物の物性を表２
に示す。なお、表２において、１）屈折率異方性は、2
3.0℃で587nmの波長により測定した値、２）閾値電圧
は、1KHzでスタティック駆動した場合においてセル透過
輝度50％における電圧、３）応答速度は（Tr＋Td）/2
（Trは輝度が10％から90％になるときの立上がり時間、
Tdは輝度が90％から10％になるときの立下がり時間）、
４）γ特性はV50/V10（V10はセル透過輝度10％における
電圧、V50はセル透過輝度50％における電圧である。Examples 1 to 5 and Conventional Examples 1 to 2 Various liquid crystal compositions were prepared by mixing the liquid crystal compounds shown in Table 1 below in the proportions shown in the same table. Table 2 shows the physical properties of each liquid crystal composition.
Shown in In Table 2, 1) refractive index anisotropy is 2
Value measured at a wavelength of 587 nm at 3.0 ° C. 2) Threshold voltage is the voltage at 50% cell transmission luminance when statically driven at 1 KHz. 3) Response speed is (Tr + Td) / 2.
(Tr is the rise time when the brightness changes from 10% to 90%,
Td is the fall time when the brightness changes from 90% to 10%),
4) The γ characteristic is V50 / V10 (V10 is a voltage at a cell transmission luminance of 10%, and V50 is a voltage at a cell transmission luminance of 50%.
これらの結果からわかるように、従来の液晶組成物に
は高速応答性を示すものもある（従来例１）が、いずれ
もγ特性に劣る。これに対し、この発明の液晶組成物
は、高速応答性を示すとともにγ特性が良好である。こ
のコントラストは、γ特性から、従来例では10程度であ
り、この発明の実施例では15〜20となり、この発明の液
晶組成物を用いた場合、コントラストが良好であること
がわかる。また、この発明の液晶組成物はΔｎが大きい
ので、急峻なγ特性を得るための条件（Δｎ・ｄ＝1.
1）を、液晶層厚を小さくしても実現できる。 As can be seen from these results, some conventional liquid crystal compositions exhibit a high-speed response (conventional example 1), but all have poor γ characteristics. On the other hand, the liquid crystal composition of the present invention exhibits high-speed response and excellent γ characteristics. From the γ characteristic, this contrast is about 10 in the conventional example and is 15 to 20 in the examples of the present invention, and it is understood that the contrast is good when the liquid crystal composition of the present invention is used. In addition, since the liquid crystal composition of the present invention has a large Δn, the condition (Δn · d = 1.
1) can be realized even if the liquid crystal layer thickness is reduced.
［発明の効果］ 以上述べたように、この発明の液晶組成物は、急峻な
閾値特性を有し、比較的低粘度でかつ大きな屈折率異方
性を有する。したがって、この発明の組成物は、高時分
割駆動による良好なコントラストと高速応答とを実現で
き、テレビ画像表示用電界効果型液晶表示素子に用いて
好適である。[Effects of the Invention] As described above, the liquid crystal composition of the present invention has a steep threshold characteristic, has a relatively low viscosity, and has a large refractive index anisotropy. Therefore, the composition of the present invention can realize good contrast and high-speed response by high time-division driving, and is suitable for use in a field effect liquid crystal display device for television image display.
Claims (4)
素数１〜５の直鎖アルキル基）で示される液晶化合物、 式 （ここで、R3は炭素数２〜５の直鎖アルキル基、R4は炭
素数１〜５の直鎖アルキル基）で示される液晶化合物、
および式 （ここで、R5およびR6はそれぞれ炭素数１〜５の直鎖ア
ルキル基）で示される液晶化合物のうち式（Ｉ）で示さ
れる液晶化合物の少なくとも１種以上を含む第１の液晶
材料を30〜60重量％、 式 （ここで、R7は炭素数６〜９の直鎖アルキル基、R8は炭
素数５〜11の直鎖アルキル基）で示される液晶化合物か
らなる第２の液晶材料を10〜40重量％、 式 （ここで、R9は炭素数２〜５の直鎖アルキル基、R10は
炭素数１〜４の直鎖アルキル基）で示される液晶化合
物、および式 （ここで、R11は炭素数１〜３の直鎖アルキル基）で示
される液晶化合物から選ばれた少なくとも１種からなる
第３の液晶化合物を20重量％以下、 式 （ここで、R12は炭素数２〜３の直鎖アルキル基、R13は
炭素数２〜５の直鎖アルキル基もしくは直鎖アルコキシ
基）で示される液晶化合物、および式 （ここで、R14は炭素数２〜４の直鎖アルキル基）で示
される液晶化合物のうち式（VII）で示される液晶化合
物の少なくとも１種を含む第４の液晶材料を10〜40重量
％、並びに 式 （ここで、R15は炭素数２〜５の直鎖アルキル基）およ
び式 （ここで、R16は炭素数２〜５の直鎖アルキル基）から
選ばれた少なくとも１種からなる第５の液晶材料を５〜
30重量％ の割合で、かつ液晶組成物誘電異方性が正となるように
それぞれ配合したことを特徴とする液晶組成物。1. A formula (Wherein R 1 is a linear alkyl group having 2 to 5 carbon atoms, R 2 is a linear alkyl group having 1 to 5 carbon atoms), a liquid crystal compound represented by the formula: (Wherein R 3 is a linear alkyl group having 2 to 5 carbon atoms, and R 4 is a linear alkyl group having 1 to 5 carbon atoms),
And expression (Wherein R 5 and R 6 are each a linear alkyl group having 1 to 5 carbon atoms), and a first liquid crystal material containing at least one liquid crystal compound represented by formula (I) 30-60% by weight, formula (Wherein R 7 is a straight-chain alkyl group having 6 to 9 carbon atoms and R 8 is a straight-chain alkyl group having 5 to 11 carbon atoms), and the second liquid crystal material is 10 to 40% by weight. , Expression (Wherein R 9 is a linear alkyl group having 2 to 5 carbon atoms, and R 10 is a linear alkyl group having 1 to 4 carbon atoms), and a liquid crystal compound represented by the formula: (Wherein R 11 is a straight-chain alkyl group having 1 to 3 carbon atoms), 20 wt% or less of a third liquid crystal compound consisting of at least one selected from liquid crystal compounds represented by the formula: (Wherein, R 12 is a straight-chain alkyl group having 2 to 3 carbon atoms, and R 13 is a straight-chain alkyl group or straight-chain alkoxy group having 2 to 5 carbon atoms), and a formula (Wherein, R 14 is a linear alkyl group having 2 to 4 carbon atoms), and 10 to 40 wt% of a fourth liquid crystal material containing at least one liquid crystal compound of the formula (VII) %, And expression (Wherein R 15 is a linear alkyl group having 2 to 5 carbon atoms) and a formula (Wherein R 16 is a linear alkyl group having 2 to 5 carbon atoms) and a fifth liquid crystal material of at least one selected from 5
A liquid crystal composition, wherein the liquid crystal composition is blended in a proportion of 30% by weight so that the dielectric anisotropy is positive.
る液晶化合物が30〜50重量％の割合で、式（II）で示さ
れる液晶化合物が０〜20重量％の割合で、および式（II
I）で示される液晶化合物が０〜30重量％の割合で配合
され、第３の液晶材料のうち、式（Ｖ）で示される液晶
化合物が０〜20重量％の割合で、および式（VI）で示さ
れる液晶化合物が０〜20重量％の割合で配合され、第４
の液晶材料のうち、式（VII）で示される液晶化合物が
５〜40重量％の割合で、および式（VIII）で示される液
晶化合物が０〜20重量％の割合で配合され、第５の液晶
材料のうち、式（IX）で示される液晶化合物が０〜20重
量％の割合で、および式（Ｘ）で示される液晶化合物が
０〜15重量％の割合で配合されている特許請求の範囲第
１項記載の液晶組成物。2. A liquid crystal compound represented by the formula (I) in a proportion of 30 to 50% by weight and a liquid crystal compound represented by the formula (II) in a proportion of 0 to 20% by weight in the first liquid crystal material. , And the expression (II
The liquid crystal compound represented by the formula (I) is blended in a proportion of 0 to 30% by weight, and in the third liquid crystal material, the liquid crystal compound represented by the formula (V) is blended in a proportion of 0 to 20% by weight, and in the formula (VI). ) Is compounded in a proportion of 0 to 20% by weight,
The liquid crystal compound represented by the formula (VII) in an amount of 5 to 40% by weight and the liquid crystal compound represented by the formula (VIII) in an amount of 0 to 20% by weight. A liquid crystal material, wherein the liquid crystal compound represented by the formula (IX) is blended in a proportion of 0 to 20% by weight, and the liquid crystal compound represented by the formula (X) is blended in a proportion of 0 to 15% by weight. A liquid crystal composition according to item 1.
35重量％、一般式（II）で示される液晶化合物を５〜15
重量％、一般式（III）で示される液晶化合物を５〜15
重量％、一般式（IV）で示される液晶化合物を15〜30重
量％、一般式（Ｖ）で示される液晶化合物を５〜10重量
％、一般式（VI）で示される液晶化合物を５〜15重量
％、一般式（VII）で示される液晶化合物を10〜30重量
％、一般式（VIII）で示される液晶化合物を５〜15重量
％、一般式（IX）で示される液晶化合物を５〜15重量
％、および一般式（Ｘ）で示される液晶化合物を３〜８
重量％の割合で配合した特許請求の範囲第１項記載の液
晶組成物。3. A liquid crystal compound represented by the general formula (I), wherein
35% by weight, 5 to 15% of the liquid crystal compound represented by the general formula (II)
The liquid crystal compound represented by the general formula (III) is 5 to 15% by weight.
% By weight, 15 to 30% by weight of the liquid crystal compound represented by the general formula (IV), 5 to 10% by weight of the liquid crystal compound represented by the general formula (V), and 5 to 10% by weight of the liquid crystal compound represented by the general formula (VI). 15% by weight, 10 to 30% by weight of the liquid crystal compound represented by the general formula (VII), 5 to 15% by weight of the liquid crystal compound represented by the general formula (VIII), 5% by weight of the liquid crystal compound represented by the general formula (IX). ˜15% by weight, and 3 to 8% of the liquid crystal compound represented by the general formula (X).
The liquid crystal composition according to claim 1, wherein the liquid crystal composition is blended in a weight percentage.
32重量％、一般式（II）で示される液晶化合物を０〜12
重量％、一般式（III）で示される液晶化合物を０〜29
重量％、一般式（IV）で示される液晶化合物を10〜26重
量％、一般式（Ｖ）で示される液晶化合物を０〜７重量
％、一般式（VI）で示される液晶化合物を０〜15重量
％、一般式（VII）で示される液晶化合物を10〜30重量
％、一般式（VIII）で示される液晶化合物を０〜10重量
％、一般式（IX）で示される液晶化合物を０〜15重量
％、および一般式（Ｘ）で示される液晶化合物を０〜８
重量％の割合で配合した特許請求の範囲第１項記載の液
晶組成物。4. A liquid crystal compound represented by the general formula (I):
32% by weight, 0 to 12 of the liquid crystal compound represented by the general formula (II)
% By weight of the liquid crystal compound represented by the general formula (III)
% By weight, 10 to 26% by weight of the liquid crystal compound represented by the general formula (IV), 0 to 7% by weight of the liquid crystal compound represented by the general formula (V), and 0 to 0% by weight of the liquid crystal compound represented by the general formula (VI). 15% by weight, 10 to 30% by weight of the liquid crystal compound represented by the general formula (VII), 0 to 10% by weight of liquid crystal compound represented by the general formula (VIII), and 0 to 10% by weight of the liquid crystal compound represented by the general formula (IX). ˜15% by weight, and 0 to 8% of the liquid crystal compound represented by the general formula (X).
The liquid crystal composition according to claim 1, wherein the liquid crystal composition is blended in a weight percentage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62334698A JP2513263B2 (en) | 1987-12-28 | 1987-12-28 | Liquid crystal composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62334698A JP2513263B2 (en) | 1987-12-28 | 1987-12-28 | Liquid crystal composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01174592A JPH01174592A (en) | 1989-07-11 |
| JP2513263B2 true JP2513263B2 (en) | 1996-07-03 |
Family
ID=18280217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62334698A Expired - Lifetime JP2513263B2 (en) | 1987-12-28 | 1987-12-28 | Liquid crystal composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2513263B2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6026083A (en) * | 1983-07-25 | 1985-02-08 | Hitachi Ltd | Liquid crystal display element |
| JPS615031A (en) * | 1984-06-19 | 1986-01-10 | Dainippon Ink & Chem Inc | Novel trans hydrocarbon compound |
| JPS6197384A (en) * | 1984-10-19 | 1986-05-15 | Dainippon Ink & Chem Inc | Nematic liquid crystal composition |
-
1987
- 1987-12-28 JP JP62334698A patent/JP2513263B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01174592A (en) | 1989-07-11 |
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