JPH04279695A - Ferroelectric liquid crystal composition - Google Patents
Ferroelectric liquid crystal compositionInfo
- Publication number
- JPH04279695A JPH04279695A JP3043400A JP4340091A JPH04279695A JP H04279695 A JPH04279695 A JP H04279695A JP 3043400 A JP3043400 A JP 3043400A JP 4340091 A JP4340091 A JP 4340091A JP H04279695 A JPH04279695 A JP H04279695A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- phase
- crystal composition
- ferroelectric liquid
- smectic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 43
- 239000005262 ferroelectric liquid crystals (FLCs) Substances 0.000 title claims description 19
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 54
- 150000001875 compounds Chemical class 0.000 claims abstract description 28
- 239000004990 Smectic liquid crystal Substances 0.000 claims abstract description 15
- 125000003545 alkoxy group Chemical group 0.000 claims abstract description 10
- 230000001747 exhibiting effect Effects 0.000 claims abstract description 7
- 239000002019 doping agent Substances 0.000 claims abstract description 6
- 125000004432 carbon atom Chemical group C* 0.000 claims description 12
- 125000000217 alkyl group Chemical group 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims 2
- 239000000470 constituent Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 5
- 239000011159 matrix material Substances 0.000 abstract 2
- 239000012071 phase Substances 0.000 description 38
- 210000004027 cell Anatomy 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 229920001721 polyimide Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000004642 Polyimide Substances 0.000 description 2
- 239000012769 display material Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004988 Nematic liquid crystal Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 238000009125 cardiac resynchronization therapy Methods 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
- C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
- C09K2019/121—Compounds containing phenylene-1,4-diyl (-Ph-)
- C09K2019/123—Ph-Ph-Ph
Landscapes
- Liquid Crystal Substances (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明は電気光学的表示材料とし
て有用な新規の強誘電性液晶組成物に関するもので、特
に従来の液晶材料と比較して、その応答速度の温度依存
性が極めて小さく、液晶表示素子の材料として有用な強
誘電性液晶組成物を提供するものである。[Industrial Application Field] The present invention relates to a novel ferroelectric liquid crystal composition useful as an electro-optical display material, and in particular, the temperature dependence of its response speed is extremely small compared to conventional liquid crystal materials. The present invention provides a ferroelectric liquid crystal composition useful as a material for liquid crystal display elements.
【0002】0002
【従来の技術】現在広く用いられている液晶表示素子は
、主にネマチック液晶を利用したツイスティッド・ネマ
チック(TN)型、あるいはスーパー・ツイスティッド
・ネマチック(STN)型と呼ばれるものであり、多く
の利点を有しているものの、その応答速度はCRT等の
発光型の表示方式と比較すると、格段に遅いという大き
な欠点があり、そのためにその応用に大きな制限があっ
た。その他の液晶表示方式も多方面から検討されている
が、応答特性の改善は余りなされていないのが実状であ
る。[Prior Art] Liquid crystal display devices that are currently widely used are of the twisted nematic (TN) type or super twisted nematic (STN) type, which mainly utilize nematic liquid crystals. However, it has the major drawback that its response speed is much slower than that of light-emitting display systems such as CRTs, and this has severely limited its application. Although other liquid crystal display systems are being studied from various angles, the reality is that little improvement has been made in response characteristics.
【0003】ところが、最近見いだされた強誘電性スメ
クチック液晶を利用した液晶表示素子においては、従来
のTN型などの表示素子の100倍以上の高速応答が可
能となった。さらに双安定性を有するため、電源を切っ
ても表示の記憶が得られることが明らかになった。この
ため、大画面高解像度ディスプレイ、薄型テレビ、光シ
ャッター、プリンターヘッド等への利用可能性が大きく
、現在、その実用化に向けて活発に開発研究がなされて
いる。However, recently discovered liquid crystal display elements using ferroelectric smectic liquid crystals have become capable of responding more than 100 times faster than conventional TN type display elements. Furthermore, it has been revealed that because it has bistable properties, it can retain its display even when the power is turned off. For this reason, it has great potential for use in large-screen high-resolution displays, flat-screen televisions, optical shutters, printer heads, etc., and active research and development is currently being conducted to put it into practical use.
【0004】強誘電性液晶は、液晶相としてはチルト系
のキラルスメクチック相に属するが、その中で最も低粘
性のキラルスメクチックC(以下、Sc*と省略する。
)相が実用上望ましい。既に数多くのSc*相を示す液
晶化合物(以下、Sc*化合物という。)が合成、検討
されているが、強誘電性液晶表示用光スイッチング素子
として用いるのに十分な性質を有するものは未だ知られ
ていない。よって他の液晶化合物との混合によりSc*
相を示す液晶組成物(以下、Sc*液晶組成物という。
)として用いられている。このようなSc*液晶組成物
の検討は活発に行われており、現在では、キラルでない
スメクチックC(以下、Scと省略する。)相を示す母
体液晶に、光学活性化合物から成るキラルドーパントを
添加する方法が一般的である。これによって高速応答性
、良好な配向性、広い作動温度範囲等の特性を合わせ持
つSc*液晶組成物が得られるようになってきた。The liquid crystal phase of ferroelectric liquid crystal belongs to the tilted chiral smectic phase, and among these, the chiral smectic C (hereinafter abbreviated as Sc*) phase, which has the lowest viscosity, is practically desirable. Many liquid crystal compounds exhibiting the Sc* phase (hereinafter referred to as Sc* compounds) have already been synthesized and studied, but none with sufficient properties to be used as optical switching elements for ferroelectric liquid crystal displays is yet known. It has not been done. Therefore, by mixing with other liquid crystal compounds, Sc*
It is used as a liquid crystal composition exhibiting a phase (hereinafter referred to as Sc* liquid crystal composition). Studies on such Sc* liquid crystal compositions are being actively conducted, and currently, a chiral dopant consisting of an optically active compound is added to a base liquid crystal exhibiting a non-chiral smectic C (hereinafter abbreviated as Sc) phase. The most common method is to As a result, it has become possible to obtain Sc* liquid crystal compositions that have characteristics such as high-speed response, good alignment, and a wide operating temperature range.
【0005】[0005]
【発明が解決しようとする課題】しかしながら、前記S
c*液晶組成物は、応答速度の温度依存性において、そ
の変化が急峻なものがほとんどであり、実際のデバイス
作成上、大きな障害となっていた。そのため応答速度の
温度依存性が小さい液晶組成物が望まれていた。[Problem to be solved by the invention] However, the above S
Most of the c* liquid crystal compositions exhibit a steep change in the temperature dependence of response speed, which has been a major obstacle in the production of actual devices. Therefore, a liquid crystal composition whose response speed is less dependent on temperature has been desired.
【0006】例えば、特開平2−38485号公報、特
開平2−38486号公報、および特開平2−3848
7号公報に記載のSc*液晶組成物が知られているが、
これらの液晶組成物の25℃および40℃における応答
速度は、2.5〜3倍もの差があり、応答速度の温度依
存性が極めて大きいものであった。For example, Japanese Patent Application Laid-Open No. 2-38485, Japanese Patent Application Publication No. 2-38486, and Japanese Patent Application Publication No. 2-3848
Although the Sc* liquid crystal composition described in Publication No. 7 is known,
The response speeds of these liquid crystal compositions at 25° C. and 40° C. differed by 2.5 to 3 times, and the temperature dependence of the response speeds was extremely large.
【0007】本発明が解決しようとする課題は、高速応
答性と良好な配向性と、広い作動温度範囲を有し、さら
にその応答速度の温度依存性が小さい強誘電性液晶組成
物を提供することにある。[0007] The problem to be solved by the present invention is to provide a ferroelectric liquid crystal composition that has high-speed response, good alignment, a wide operating temperature range, and has a small temperature dependence of its response speed. There is a particular thing.
【0008】[0008]
【課題を解決するための手段】本発明は前記課題を解決
するために下記の強誘電性液晶組成物を提供する。すな
わち、(1)一般式(I)[Means for Solving the Problems] In order to solve the above problems, the present invention provides the following ferroelectric liquid crystal composition. That is, (1) general formula (I)
【0009】[0009]
【化3】[Chemical formula 3]
【0010】(式中、R1およびR2は、各々独立的に
炭素原子数4〜12の直鎖または分岐状のアルキル基ま
たはアルコキシル基を表わすが、好ましくはR1は炭素
原子数4〜12の直鎖状のアルコキシル基を表わし、R
2は炭素原子数4〜12の直鎖状のアルキル基を表す。
)で表わされる化合物、及び一般式(II)(In the formula, R1 and R2 each independently represent a straight-chain or branched alkyl group or alkoxyl group having 4 to 12 carbon atoms, but preferably R1 is a straight-chain or branched alkyl group having 4 to 12 carbon atoms. Represents a chain alkoxyl group, R
2 represents a linear alkyl group having 4 to 12 carbon atoms. ) and general formula (II)
【0011
】0011
]
【化4】[C4]
【0012】(式中、R3およびR4は、各々独立的に
炭素原子数4〜12の直鎖または分岐状のアルキル基ま
たはアルコキシル基を表わすが、好ましくはR3、R4
の一方が炭素原子数4〜12の直鎖状のアルコキシル基
を表わし、他方が炭素原子数4〜12の直鎖状のアルキ
ル基を表す。)で表わされる化合物を含有し、Sc相を
示す母体液晶に、(2)光学活性化合物から成るキラル
ドーパントを加えてなる強誘電性液晶組成物を提供する
ものであり、さらに好ましくはSc相を示す母体液晶中
に、一般式(I)で表わされる化合物を5〜50重量%
、及び一般式(II)で表わされる化合物を10〜80
重量%含有する強誘電性液晶組成物を提供するものであ
る。(In the formula, R3 and R4 each independently represent a linear or branched alkyl group or alkoxyl group having 4 to 12 carbon atoms, but preferably R3, R4
One of these represents a linear alkoxyl group having 4 to 12 carbon atoms, and the other represents a linear alkyl group having 4 to 12 carbon atoms. ) A ferroelectric liquid crystal composition is provided in which a chiral dopant consisting of (2) an optically active compound is added to a base liquid crystal that contains a compound represented by (2) and exhibits an Sc phase, and more preferably has an Sc phase. 5 to 50% by weight of the compound represented by general formula (I) in the parent liquid crystal shown.
, and the compound represented by general formula (II) at 10 to 80
% by weight of a ferroelectric liquid crystal composition.
【0013】一般式(I)で表わされる化合物は比較的
広い温度範囲で、特に高い温度域までSc相を示す化合
物であり、また3環型の化合物としては低粘性であるた
め、Sc相を示す母体液晶の調製に適した化合物である
。The compound represented by the general formula (I) is a compound that exhibits an Sc phase over a relatively wide temperature range, especially up to a high temperature range, and has low viscosity as a tricyclic compound, so it does not exhibit an Sc phase. This compound is suitable for preparing the parent liquid crystal shown in FIG.
【0014】本発明に係わるSc*液晶組成物は、一般
式(I)で表される化合物を母体液晶の主成分として含
有しているが、含有量が5重量%以下であると効果が少
なく、50重量%を超えると母体液晶の粘性が高くなり
、応答速度が遅くなるので、母体液晶中に5〜50重量
%含有することが好ましい。一般式(I)で表わされる
化合物の例を第1表に示す。The Sc* liquid crystal composition according to the present invention contains the compound represented by the general formula (I) as a main component of the parent liquid crystal, but if the content is less than 5% by weight, the effect will be low. If it exceeds 50% by weight, the viscosity of the base liquid crystal increases and the response speed becomes slow, so it is preferably contained in the base liquid crystal in an amount of 5 to 50% by weight. Examples of compounds represented by general formula (I) are shown in Table 1.
【0015】[0015]
【表1】[Table 1]
【0016】(表中、Crは結晶相を、Iは等方性液体
相を、Nはネマチック相を、SAはスメクチックA相を
、ScはスメクチックC相を、SBはスメクチックB相
を、S3、S4はそれぞれ帰属不明のスメクチック相を
表す。)一方、一般式(II)の化合物は、非常に低い
温度域でSc相を示すかあるいは示さない化合物である
が、粘性が非常に低く、高速応答を可能とするものであ
り、母体液晶の調製に適した化合物である。(In the table, Cr represents the crystalline phase, I represents the isotropic liquid phase, N represents the nematic phase, SA represents the smectic A phase, Sc represents the smectic C phase, SB represents the smectic B phase, and S3 represents the smectic A phase. , S4 each represent a smectic phase of unknown attribution.) On the other hand, the compound of general formula (II) is a compound that shows or does not show an Sc phase in a very low temperature range, but has a very low viscosity and a high speed This compound is suitable for preparing parent liquid crystals.
【0017】本発明に係わるSc*液晶組成物は、この
一般式(II)で表わされる化合物を母体液晶の主成分
として含有しているが、含有量が10重量%以下である
と効果が少なく、80重量%を超えると、母体液晶のS
c相の温度範囲が低くなりすぎるので、母体液晶中に1
0〜80重量%含有することが好ましい。一般式(II
)で表わされる化合物の例を第2表に示す。The Sc* liquid crystal composition according to the present invention contains the compound represented by the general formula (II) as a main component of the parent liquid crystal, but if the content is less than 10% by weight, the effect will be low. , if it exceeds 80% by weight, the S of the parent liquid crystal
Since the temperature range of the c phase becomes too low, 1
The content is preferably 0 to 80% by weight. General formula (II
Examples of compounds represented by ) are shown in Table 2.
【0018】[0018]
【表2】[Table 2]
【0019】(表中、Crは結晶相を、Iは等方性液体
相を、Nはネマチック相を、SAはスメクチックA相を
、ScはスメクチックC相を表す。)本発明のSc*液
晶組成物の特徴は、その応答速度の温度依存性が非常に
小さいことである。(In the table, Cr represents a crystalline phase, I represents an isotropic liquid phase, N represents a nematic phase, SA represents a smectic A phase, and Sc represents a smectic C phase.) Sc* liquid crystal of the present invention A feature of the composition is that the temperature dependence of its response speed is very small.
【0020】ここで本発明に係わる一般式(I)及び一
般式(II)で表わされる化合物から成る母体液晶(A
)を調製した。この母体液晶(A)は、42℃までSc
相を、51.5℃までSA相を、72℃までN相を示す
。[0020] Here, the base liquid crystal (A
) was prepared. This parent liquid crystal (A) is Sc up to 42°C.
The phase shows an SA phase up to 51.5°C and an N phase up to 72°C.
【0021】なお、母体液晶(A)は、[0021] The parent liquid crystal (A) is
【0022】[0022]
【化5】[C5]
【0023】から成るものである。(組成比は重量%を
表わす。以下同じ)この母体液晶(A)98%と、キラ
ルドーパントとして式It consists of the following. (The composition ratio represents weight %. The same applies hereinafter.) 98% of this base liquid crystal (A) and the formula
【0024】[0024]
【化6】[C6]
【0025】で表される光学活性ラクトン誘導体2%か
ら調製したSc*液晶組成物は、44.5℃以下でSc
*相を示す。この組成物を厚さ約2μmのセルに充填し
、電界強度10Vp−p/μm印加時の応答速度を測定
し、その結果を第3表に示した。The Sc* liquid crystal composition prepared from 2% of the optically active lactone derivative represented by
*Indicates phase. This composition was filled into a cell with a thickness of about 2 μm, and the response speed when an electric field strength of 10 Vp-p/μm was applied was measured. The results are shown in Table 3.
【0026】[0026]
【表3】[Table 3]
【0027】この結果から明らかなように、温度が40
℃から25℃まで変化してもその応答速度は76μ秒か
ら88μ秒と約15%程度しか変化しておらず、これは
従来の強誘電性液晶材料と比較して、極めて小さい変化
であるといえる。この応答速度の温度依存性が極めて小
さい点は、本発明の液晶組成物の優れた特徴であるとい
える。このため本発明の強誘電性液晶組成物は、実際の
表示用材料としてデバイス作成上、非常に好適である。As is clear from this result, when the temperature is 40
Even when the temperature changes from °C to 25 °C, the response speed changes by only about 15%, from 76 μs to 88 μs, which is an extremely small change compared to conventional ferroelectric liquid crystal materials. I can say that. This extremely small temperature dependence of the response speed can be said to be an excellent feature of the liquid crystal composition of the present invention. Therefore, the ferroelectric liquid crystal composition of the present invention is very suitable for producing devices as actual display materials.
【0028】[0028]
【実施例】以下に実施例をあげて本発明を具体的に説明
するが、本発明の主旨および適用範囲はこれらの実施例
によって制限されるものではない。[Examples] The present invention will be specifically explained below with reference to Examples, but the gist and scope of the present invention are not limited by these Examples.
【0029】本実施例において、相転移温度の測定は温
度調節ステージを備えた偏光顕微鏡および示差走査熱量
計(DSC)を併用して行った。また組成物中における
%はすべて重量%を表わすものとする。
(実施例1)母体液晶(A)98%と、式In this example, the phase transition temperature was measured using a polarizing microscope equipped with a temperature control stage and a differential scanning calorimeter (DSC). Further, all percentages in the composition represent weight percentages. (Example 1) Base liquid crystal (A) 98% and formula
【0030】[0030]
【化7】[C7]
【0031】で表される(2R,4R)−2−[4−(
3−フルオロ−4−オクチルオキシベンゾイルオキシ)
フェニル]−4−デカノリド2%から成るSc*液晶組
成物を調製した。このSc*液晶組成物は44.5℃ま
でSc*相を、50℃までSA相を、74℃までN*相
をそれぞれ示した。またその融点は明瞭ではなかった。(2R,4R)-2-[4-(
3-fluoro-4-octyloxybenzoyloxy)
An Sc* liquid crystal composition consisting of 2% phenyl]-4-decanolide was prepared. This Sc* liquid crystal composition exhibited an Sc* phase up to 44.5°C, an SA phase up to 50°C, and an N* phase up to 74°C. Moreover, its melting point was not clear.
【0032】次にこの液晶組成物を用いて、以下の手順
で液晶セルを作成した。まず、EHC社より市販されて
いるITO蒸着ガラス板(電極面積70mm2)を洗浄
、乾燥した。これにポリイミド形成溶液「PIQ」(日
立化成工業社製)をスピナー塗布機で塗布し、ポリイミ
ド被膜を形成した(基板A)。Next, using this liquid crystal composition, a liquid crystal cell was prepared according to the following procedure. First, an ITO vapor-deposited glass plate (electrode area: 70 mm2) commercially available from EHC Company was washed and dried. A polyimide forming solution "PIQ" (manufactured by Hitachi Chemical Co., Ltd.) was applied to this using a spinner coater to form a polyimide film (substrate A).
【0033】同様にして、グラスファイバーのスペーサ
ーを混合した、上記のポリイミド形成溶液を用いて、ス
ペーサーを含んだポリイミド被膜を形成した(基板B)
。基板A及び基板Bをナイロン布でラビング処理を施し
た後、一方の基板に熱硬化型エポキシ接着剤を塗布して
、基板A及びBをそのラビング方向が互いに平行かつ逆
向きになるように重ね合わせ、80℃で3時間放置し、
硬化させ、セルを作成した。Similarly, a polyimide film containing a spacer was formed using the above polyimide forming solution mixed with a glass fiber spacer (substrate B).
. After rubbing substrates A and B with nylon cloth, apply a thermosetting epoxy adhesive to one substrate, and stack substrates A and B so that the rubbing directions are parallel and opposite to each other. Combine and leave at 80℃ for 3 hours.
It was cured and cells were created.
【0034】こうして作成したセルに、上記液晶組成物
を加熱して等方性液体相とした状態で注入し、次いで1
分間に1℃の割合で徐冷を行い、N*相、SA相、次い
でSc*相を配向させ、液晶表示素子を得た。このセル
厚を測定したところ、2.0μmであった。The above-mentioned liquid crystal composition was heated to form an isotropic liquid phase and then injected into the thus prepared cell.
Slow cooling was performed at a rate of 1° C. per minute to orient the N* phase, SA phase, and then Sc* phase to obtain a liquid crystal display element. The thickness of this cell was measured and found to be 2.0 μm.
【0035】このセルに電界強度10Vp−p/μmの
矩形波を印加してその電気光学応答速度、自発分極、チ
ルト角を測定した。A rectangular wave with an electric field strength of 10 Vp-p/μm was applied to this cell, and its electro-optical response speed, spontaneous polarization, and tilt angle were measured.
【0036】[0036]
【表4】[Table 4]
【0037】コントラストは良好であった。この結果か
ら本発明に係わるSc*液晶組成物の25℃および40
℃における応答時間の差は約15%しか認められず、本
発明の液晶組成物の応答速度の温度依存性は非常に小さ
いことが判明した。
(実施例2)母体液晶(A)80%と、以下の組成から
なるキラルドーパント[0037] Contrast was good. From this result, it was found that the Sc* liquid crystal composition according to the present invention was
The difference in response time at 0.degree. C. was only about 15%, indicating that the temperature dependence of the response speed of the liquid crystal composition of the present invention is very small. (Example 2) Chiral dopant consisting of 80% base liquid crystal (A) and the following composition
【0038】[0038]
【化8】[Chemical formula 8]
【0039】20%から成るSc*液晶組成物を調製し
た。このSc*液晶組成物は44℃までSc*相を、6
0.5℃までSA相を、71.5℃までN*相を、それ
ぞれ示した。 実施例1と全く同様にして液晶表示素
子を作成し、その電気光学応答速度を測定したところ、
応答速度は25℃において34μ秒、40℃において2
4μ秒であり、温度依存性の非常に小さい高速応答が確
認できた。A 20% Sc* liquid crystal composition was prepared. This Sc* liquid crystal composition maintains the Sc* phase up to 44°C.
The SA phase was shown up to 0.5°C, and the N* phase was shown up to 71.5°C. A liquid crystal display element was prepared in exactly the same manner as in Example 1, and its electro-optic response speed was measured.
The response speed is 34 μs at 25°C and 2 μs at 40°C.
The response time was 4 μsec, which confirmed a high-speed response with very little temperature dependence.
【0040】[0040]
【発明の効果】本発明に係わる強誘電性液晶組成物は、
広い温度範囲でSc*相を示し、100μ秒以下という
高速応答が可能であり、しかもその応答速度の温度依存
性は極めて小さい。従って、本発明の強誘電性液晶組成
物は、表示用光スイッチング素子の材料として極めて有
用である。[Effect of the invention] The ferroelectric liquid crystal composition according to the present invention has
It exhibits the Sc* phase over a wide temperature range, and is capable of a high-speed response of 100 microseconds or less, and the temperature dependence of the response speed is extremely small. Therefore, the ferroelectric liquid crystal composition of the present invention is extremely useful as a material for optical switching elements for display.
Claims (5)
〜12の直鎖または分岐状のアルキル基またはアルコキ
シル基を表わす。)で表わされる化合物、及び一般式(
II) 【化2】 (式中、R3およびR4は、各々独立的に炭素原子数4
〜12の直鎖または分岐状のアルキル基またはアルコキ
シル基を表わす。)で表わされる化合物を含有するスメ
クチックC(Sc)相を示す母体液晶と、(2)光学活
性化合物から成るキラルドーパントを含有することを特
徴とする強誘電性液晶組成物。Claim 1 (1) General formula (I) [Formula 1] (wherein, R1 and R2 each independently have a carbon atom number of 4
~12 linear or branched alkyl groups or alkoxyl groups. ), and compounds represented by the general formula (
II) [Formula 2] (wherein, R3 and R4 each independently have a carbon atom number of 4
~12 linear or branched alkyl groups or alkoxyl groups. 1. A ferroelectric liquid crystal composition comprising: a host liquid crystal exhibiting a smectic C (Sc) phase containing a compound represented by (2) a chiral dopant consisting of an optically active compound.
アルコキシル基であり、R2が炭素原子数4〜12の直
鎖状のアルキル基である請求項1記載の強誘電性液晶組
成物。2. The ferroelectric liquid crystal composition according to claim 1, wherein R1 is a linear alkoxyl group having 4 to 12 carbon atoms, and R2 is a linear alkyl group having 4 to 12 carbon atoms. thing.
12の直鎖状のアルコキシル基であり、他方が炭素原子
数4〜12の直鎖状のアルキル基である請求項2記載の
強誘電性液晶組成物。[Claim 3] One of R3 or R4 has 4 or more carbon atoms.
3. The ferroelectric liquid crystal composition according to claim 2, wherein one of the 12 linear alkoxyl groups is a linear alkyl group having 4 to 12 carbon atoms.
液晶中に一般式(I)で表わされる化合物を5〜50重
量%、一般式(II)で表わされる化合物を10〜80
重量%含有することを特徴とする請求項1記載の強誘電
性液晶組成物。4. 5 to 50% by weight of a compound represented by general formula (I) and 10 to 80% by weight of a compound represented by general formula (II) in a host liquid crystal exhibiting a smectic C (Sc) phase.
2. The ferroelectric liquid crystal composition according to claim 1, wherein the ferroelectric liquid crystal composition contains % by weight.
性液晶組成物を構成要素とする液晶表示素子。5. A liquid crystal display element comprising the ferroelectric liquid crystal composition according to claim 1, 2, 3, or 4 as a constituent element.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3043400A JPH04279695A (en) | 1991-03-08 | 1991-03-08 | Ferroelectric liquid crystal composition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3043400A JPH04279695A (en) | 1991-03-08 | 1991-03-08 | Ferroelectric liquid crystal composition |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04279695A true JPH04279695A (en) | 1992-10-05 |
Family
ID=12662728
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3043400A Pending JPH04279695A (en) | 1991-03-08 | 1991-03-08 | Ferroelectric liquid crystal composition |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04279695A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005007775A1 (en) * | 2003-07-11 | 2005-01-27 | Merck Patent Gmbh | Liquid-crystal medium containing monofluoroterphenyl compounds |
WO2006038443A1 (en) | 2004-10-04 | 2006-04-13 | Chisso Corporation | Liquid crystal composition and liquid crystal display element |
-
1991
- 1991-03-08 JP JP3043400A patent/JPH04279695A/en active Pending
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005007775A1 (en) * | 2003-07-11 | 2005-01-27 | Merck Patent Gmbh | Liquid-crystal medium containing monofluoroterphenyl compounds |
JP2007526931A (en) * | 2003-07-11 | 2007-09-20 | メルク パテント ゲゼルシャフト ミット ベシュレンクテル ハフトング | Liquid crystal medium containing monofluoroterphenyl compound |
US7390538B2 (en) | 2003-07-11 | 2008-06-24 | Merck Patent Gmbh | Liquid-crystal medium containing monofluoroterphenyl compounds |
WO2006038443A1 (en) | 2004-10-04 | 2006-04-13 | Chisso Corporation | Liquid crystal composition and liquid crystal display element |
EP1808472A1 (en) * | 2004-10-04 | 2007-07-18 | Chisso Corporation | Liquid crystal composition and liquid crystal display element |
EP1808472A4 (en) * | 2004-10-04 | 2009-03-18 | Chisso Corp | Liquid crystal composition and liquid crystal display element |
US7638174B2 (en) | 2004-10-04 | 2009-12-29 | Chisso Corporation | Liquid crystal composition and liquid crystal display element |
EP2366756A2 (en) | 2004-10-04 | 2011-09-21 | JNC Corporation | Liquid Crystal Composition and Liquid Crystal Display Element |
EP2366756A3 (en) * | 2004-10-04 | 2012-11-21 | JNC Corporation | Liquid Crystal Composition and Liquid Crystal Display Element |
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