JPH08320471A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH08320471A JPH08320471A JP12794995A JP12794995A JPH08320471A JP H08320471 A JPH08320471 A JP H08320471A JP 12794995 A JP12794995 A JP 12794995A JP 12794995 A JP12794995 A JP 12794995A JP H08320471 A JPH08320471 A JP H08320471A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- display device
- crystal display
- contact
- kinds
- 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.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 59
- 239000000758 substrate Substances 0.000 claims abstract description 20
- 229920000547 conjugated polymer Polymers 0.000 claims description 25
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 12
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 claims description 8
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 claims description 6
- 229930192474 thiophene Natural products 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 16
- 239000012535 impurity Substances 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 5
- 229920000642 polymer Polymers 0.000 abstract description 4
- 239000000126 substance Substances 0.000 description 14
- 239000010408 film Substances 0.000 description 9
- 238000001179 sorption measurement Methods 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 8
- 229920000128 polypyrrole Polymers 0.000 description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- 229920001940 conductive polymer Polymers 0.000 description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 6
- 239000010931 gold Substances 0.000 description 6
- 229910052737 gold Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 229920000767 polyaniline Polymers 0.000 description 5
- 229920000123 polythiophene Polymers 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229920000265 Polyparaphenylene Polymers 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- -1 polyparaphenylene Polymers 0.000 description 4
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 3
- JFDZBHWFFUWGJE-UHFFFAOYSA-N benzonitrile Chemical compound N#CC1=CC=CC=C1 JFDZBHWFFUWGJE-UHFFFAOYSA-N 0.000 description 3
- 239000008096 xylene Substances 0.000 description 3
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 239000004988 Nematic liquid crystal Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 150000001555 benzenes Chemical class 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 150000003983 crown ethers Chemical class 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- 150000008040 ionic compounds Chemical class 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 238000001771 vacuum deposition Methods 0.000 description 2
- OXHNLMTVIGZXSG-UHFFFAOYSA-N 1-Methylpyrrole Chemical compound CN1C=CC=C1 OXHNLMTVIGZXSG-UHFFFAOYSA-N 0.000 description 1
- WBIQQQGBSDOWNP-UHFFFAOYSA-N 2-dodecylbenzenesulfonic acid Chemical compound CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O WBIQQQGBSDOWNP-UHFFFAOYSA-N 0.000 description 1
- HEMGYNNCNNODNX-UHFFFAOYSA-N 3,4-diaminobenzoic acid Chemical group NC1=CC=C(C(O)=O)C=C1N HEMGYNNCNNODNX-UHFFFAOYSA-N 0.000 description 1
- QKFFSWPNFCXGIQ-UHFFFAOYSA-M 4-methylbenzenesulfonate;tetraethylazanium Chemical compound CC[N+](CC)(CC)CC.CC1=CC=C(S([O-])(=O)=O)C=C1 QKFFSWPNFCXGIQ-UHFFFAOYSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229920000280 Poly(3-octylthiophene) Polymers 0.000 description 1
- 241000981595 Zoysia japonica Species 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 238000005349 anion exchange Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 229940060296 dodecylbenzenesulfonic acid Drugs 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000005262 ferroelectric liquid crystals (FLCs) Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- OXHJCNSXYDSOFN-UHFFFAOYSA-N n-hexylaniline Chemical compound CCCCCCNC1=CC=CC=C1 OXHJCNSXYDSOFN-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 229920001197 polyacetylene Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 150000003233 pyrroles Chemical class 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 150000003577 thiophenes Chemical class 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は液晶表示装置、さらに詳
しくは液晶中に含まれるイオン性の不純物の影響を低減
することを可能とした液晶表示装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device capable of reducing the influence of ionic impurities contained in liquid crystal.
【０００２】[0002]
【従来の技術】液晶表示装置はＯＡ機器、液晶テレビ等
各方面で実用化されている。従来のカラー液晶表示装置
は表示用の電極を形成した２枚の基板と、これら２枚の
基板間に充填された液晶とから構成されている。液晶表
示装置では、一般に液晶材料として比抵抗値が１０10Ω
／cm程度のものを使用するため、液晶中には多量の不純
物が含まれている。この不純物は液晶表示装置の表示特
性にも影響を与え、フリッカーや液晶層の閾値電圧の変
動による表示ムラ等の原因となる。さらに、液晶材料の
比抵抗値が１０10Ω／cm程度より小さくなるとカー・ヘ
ルリッヒ効果により動的散乱現象が起こり、見かけの閾
値電圧が変動して表示品位が低下することが知られてい
る。2. Description of the Related Art Liquid crystal display devices have been put to practical use in various fields such as office automation equipment and liquid crystal televisions. A conventional color liquid crystal display device is composed of two substrates on which electrodes for display are formed and a liquid crystal filled between these two substrates. Liquid crystal display devices generally have a specific resistance value of 10 10 Ω as a liquid crystal material.
Since a liquid crystal material of about / cm is used, the liquid crystal contains a large amount of impurities. This impurity also affects the display characteristics of the liquid crystal display device, and causes flicker and display unevenness due to fluctuations in the threshold voltage of the liquid crystal layer. Further, it is known that when the specific resistance value of the liquid crystal material is smaller than about 10 10 Ω / cm, a dynamic scattering phenomenon occurs due to the Kerr-Herlich effect, the apparent threshold voltage fluctuates, and the display quality deteriorates.
【０００３】そこで、液晶中の不純物の除去が従来より
試行されていた。例えば特開平１−２４４４２７号公報
には液晶分子の初期配向を制御する配向膜がイオン性化
合物を物理化学的に吸着しうる担体と、高分子化合物の
混合物からなる液晶素子が開示されている。Therefore, removal of impurities in the liquid crystal has been conventionally tried. For example, Japanese Patent Application Laid-Open No. 1-244427 discloses a liquid crystal element in which an alignment film for controlling the initial alignment of liquid crystal molecules comprises a mixture of a polymer capable of physically adsorbing an ionic compound and a polymer compound.
【０００４】また、特開平４−９７１２７号公報には２
枚の電極基板の少なくとも一方に於いて電極以外の部分
に液晶層中の不純物を吸着するための不純物吸着層が形
成されている液晶表示装置が開示されている。Further, Japanese Unexamined Patent Publication No. 4-97127 discloses 2
A liquid crystal display device is disclosed in which an impurity adsorption layer for adsorbing impurities in a liquid crystal layer is formed on a portion other than the electrodes on at least one of the electrode substrates.
【０００５】さらに、特開平４−３２０２１１号公報に
はイオン吸着膜が画素電極以外の領域に設けられている
液晶表示素子が開示されている。これらの公報に示され
ているイオン性化合物を吸着しうる担体は３，４−ジア
ミノ安息香酸などのアミノ基、カルボキシル基等の官能
基を有する化合物であり、イオン吸着膜は陽イオン交換
能と陰イオン交換能を合わせ持つ複合膜である。しかし
ながら、不純物吸着層としてイオン交換能を有する化合
物を使用した場合、一般には、例えばカチオンを吸着す
る場合には同数のプロトンが発生し、系中のイオンの数
は変わらないと考えられ、また、アニオンを吸着する場
合も同様である。クラウンエーテルを含む物質では系中
のカチオン性物質を取り込むことができると考えられる
が、この時には取り込むカチオン性物質はクラウンエー
テルの大きさによって限定される。このように、従来の
不純物吸着層として提案されているものは効果がない
か、たとえ効果があっても限定されたものであると考え
られる。Further, Japanese Patent Application Laid-Open No. 4-320211 discloses a liquid crystal display element in which an ion adsorption film is provided in a region other than a pixel electrode. The carriers capable of adsorbing ionic compounds disclosed in these publications are compounds having functional groups such as amino groups such as 3,4-diaminobenzoic acid and carboxyl groups, and the ion adsorption membrane has a cation exchange capacity and It is a composite membrane that also has anion exchange capacity. However, when a compound having an ion exchange capacity is used as the impurity adsorption layer, generally, for example, when adsorbing a cation, the same number of protons are generated, and it is considered that the number of ions in the system does not change. The same applies when adsorbing anions. It is considered that the substance containing crown ether can take in the cationic substance in the system, but the cationic substance to be taken in at this time is limited by the size of the crown ether. As described above, it is considered that the conventional impurity adsorption layers proposed have no effect or are limited even if they have an effect.
【０００６】また、特開平４−９７１２７号公報の不純
物吸着層については具体的な記述が見当たらない。Further, no specific description is found for the impurity adsorption layer in Japanese Patent Laid-Open No. 4-97127.
【０００７】一方、ポリアセチレンやポリパラフェニレ
ン、ポリピロール、ポリチオフェン、ポリアニリンなど
のπ電子共役系高分子化合物が開発され、電子供与性、
または電子吸引性化合物をドーパントとして作用させる
と電気的、光学的性質が大きく変化することが知られて
いる。例えば本発明者らによる特開昭６２−３６４２３
号公報にはベンゼンをモノマーとするポリパラフェニレ
ンの電解重合による合成が開示されている。これらのπ
電子共役系高分子化合物は導電性高分子と呼ばれてい
る。この導電性高分子の電子供与性、または電子吸引性
化合物を取り込む性質を利用して、これを電極活物質と
する二次電池も提案されている。本発明者らによるジャ
パニーズ・ジャーナル・オブ・アプライド・フィジクス
誌（Ｊａｐａｎｅｓｅ Ｊｏｕｒｎａｌ ｏｆ Ａｐｐ
ｌｉｅｄ Ｐｈｙｓｉｃｓ）１９８６年、２６巻、Ｌ３
５６頁にはポリパラフェニレンを電極とする二次電池が
示されている。しかしながら、導電性高分子はそのまま
ではドーパントとなりうるイオン性の物質を取り込まな
い。導電性高分子にイオン性物質を取り込ませるために
は、導電性高分子を電解反応等で酸化、または還元しな
ければならない。On the other hand, π-electron conjugated polymer compounds such as polyacetylene, polyparaphenylene, polypyrrole, polythiophene and polyaniline have been developed, and electron donating property,
Alternatively, it is known that when an electron-withdrawing compound acts as a dopant, electrical and optical properties are significantly changed. For example, JP-A-62-36423 by the present inventors.
Japanese Patent Laid-Open Publication No. 1993-242242 discloses the synthesis of polyparaphenylene containing benzene as a monomer by electrolytic polymerization. These π
The electron-conjugated polymer compound is called a conductive polymer. A secondary battery has also been proposed, which uses the electron-donating or electron-withdrawing compound's property of the conductive polymer as an electrode active material. The Japanese Journal of Applied Physics by the present inventors
Lied Physics) 1986, Volume 26, L3
On page 56, a secondary battery using polyparaphenylene as an electrode is shown. However, the conductive polymer itself does not take in an ionic substance that can serve as a dopant. In order to incorporate the ionic substance into the conductive polymer, the conductive polymer must be oxidized or reduced by electrolytic reaction or the like.
【０００８】[0008]
【発明が解決しようとする課題】液晶表示装置において
表示特性に悪影響を及ぼすイオン性不純物を効率的かつ
簡便に除去する方法が望まれているが、これまで得られ
ていないという問題があった。There has been a demand for a method of efficiently and simply removing ionic impurities which adversely affect display characteristics in a liquid crystal display device, but there has been a problem that it has not been obtained so far.
【０００９】本発明の目的は液晶表示装置からイオン性
不純物を効率的かつ簡便に除去する方法を開発し、表示
品位の改善された液晶表示装置を提供することにある。An object of the present invention is to develop a method for efficiently and simply removing ionic impurities from a liquid crystal display device, and to provide a liquid crystal display device having improved display quality.
【００１０】[0010]
【課題を解決するための手段】本発明者らは上記課題を
解決するために鋭意検討を行った。その結果、電極を有
する２枚の基板間に液晶が充填されている液晶表示装置
において、相互に接触した少なくとも２種類以上のπ電
子共役系高分子が液晶に接して設けられていることを特
徴とする液晶表示装置が、表示特性に悪影響を及ぼすイ
オン性不純物を効率的かつ簡便に除去できることを見い
だし、本発明に至った。すなわち、本発明は相互に接触
した２種類以上のπ電子共役系高分子が液晶に接して設
けられたイオン性不純物を効率的かつ簡便に除去でき
る、表示品位の改善された液晶表示装置である。Means for Solving the Problems The inventors of the present invention have made extensive studies to solve the above problems. As a result, in a liquid crystal display device in which liquid crystal is filled between two substrates having electrodes, at least two types of π-electron conjugated polymers which are in contact with each other are provided in contact with the liquid crystal. The inventors have found that the liquid crystal display device described above can efficiently and simply remove ionic impurities that adversely affect the display characteristics, and have reached the present invention. That is, the present invention is a liquid crystal display device with improved display quality in which two or more types of π-electron conjugated polymers in contact with each other can efficiently and easily remove ionic impurities provided in contact with liquid crystal. .
【００１１】本発明において使用できる液晶表示装置の
種類や表示様式は特に限定されず、例えばツイステット
ネマチック液晶や超ツイステットネマチック液晶、強誘
電性液晶、反強誘電性液晶、コレステリック液晶、樹脂
分散型液晶表示装置、樹脂安定化型コレステリック液晶
表示装置などの従来公知のものが使用できる。また、そ
の表示駆動方式も特に限定されず、単純マトリックス方
式、薄膜トランジスタ方式などの従来公知のものが使用
できる。The type and display mode of the liquid crystal display device that can be used in the present invention are not particularly limited. For example, twisted nematic liquid crystal, super twisted nematic liquid crystal, ferroelectric liquid crystal, antiferroelectric liquid crystal, cholesteric liquid crystal, resin dispersion. Known liquid crystal display devices, resin-stabilized cholesteric liquid crystal display devices and the like can be used. The display driving method is not particularly limited, and a conventionally known one such as a simple matrix method or a thin film transistor method can be used.
【００１２】本発明では上記の液晶表示装置において、
液晶に接して設けた２種類以上のπ共役系高分子を相互
に接触して使用する。すでに述べたように、π共役系高
分子は単独ではイオン性物質を取り込むことができない
が、本発明者らの検討の結果、２種類以上のπ共役系高
分子を電気的に接触させた状態ではイオン性物質を取り
込むことが明らかとなった。この理由としては、詳細は
不明であるがイオン化ポテンシャルの異なるπ共役系高
分子を電気的に接続すると電荷の移動が起こり、これを
イオン性物質を含む溶液と接触させると局部電池のよう
な構成が成立するためと考えられる。このため、本発明
で使用できる２種類以上のπ共役系高分子は互いにイオ
ン化ポテンシャルが異なるものであればその組み合わせ
は限定されないが、その差が大きいものの方が好まし
い。この観点から、２種類以上のπ共役系高分子として
イオン化ポテンシャルの大きなものと小さなものを組み
合わせることが好ましい。イオン化ポテンシャルの大き
なものとしては、例えばポリピロールやポリ（Ｎ−メチ
ルピロール）等のピロールもしくはピロール誘導体を主
鎖骨格に有するものやポリアニリン、ポリ（Ｎ−ヘキシ
ルアニリン）等のベンゼンもしくはベンゼン誘導体を主
鎖骨格に有するものが挙げられる。また、イオン化ポテ
ンシャルの小さなものとしてはポリチオフェンやポリ
（３−オクチルチオフェン）などのチオフェンもしくは
チオフェン誘導体を主鎖骨格に有するものやポリパラフ
ェニレンなどのベンゼンもしくはベンゼン誘導体を主鎖
骨格に有するものなどが挙げられる。In the present invention, in the above liquid crystal display device,
Two or more kinds of π-conjugated polymers provided in contact with liquid crystal are used in contact with each other. As described above, the π-conjugated polymer cannot take in an ionic substance by itself, but as a result of the study by the present inventors, a state in which two or more kinds of π-conjugated polymer are electrically contacted Then, it became clear that it took in an ionic substance. The reason for this is not clear, but transfer of charges occurs when π-conjugated polymers with different ionization potentials are electrically connected, and contact with a solution containing an ionic substance results in a local battery-like configuration. It is considered that this is the case. Therefore, the combination of two or more kinds of π-conjugated polymers that can be used in the present invention is not limited as long as they have different ionization potentials, but the one having a large difference is preferable. From this viewpoint, it is preferable to combine two or more types of π-conjugated polymers with ones having a large ionization potential and those having a small ionization potential. As those having a large ionization potential, for example, those having a pyrrole or a pyrrole derivative such as polypyrrole or poly (N-methylpyrrole) in the main chain skeleton or benzene or a benzene derivative such as polyaniline or poly (N-hexylaniline) are the main chain bones. Those that have the right case are listed. Also, those having a small ionization potential include those having thiophene or thiophene derivative such as polythiophene and poly (3-octylthiophene) in the main chain skeleton, and those having benzene or benzene derivative such as polyparaphenylene in the main chain skeleton. Can be mentioned.
【００１３】本発明では上記の２種類以上のπ共役系高
分子化合物を相互に接触させる方法は特に限定されず、
単純に金属などの導電体を介して接続したり、直接接触
させたりして用いられるが、イオン吸着の効果の点から
直接接触させる方が好ましく、特に２種類以上のπ共役
系高分子の微少領域が交互に繰り返すようなミクロ相分
離構造、あるいは第１のπ共役系高分子の連続相に第２
のπ共役系高分子の微少領域が分散した構造が好まし
い。In the present invention, the method of contacting the above-mentioned two or more kinds of π-conjugated polymer compounds with each other is not particularly limited,
It is used by simply connecting it through a conductor such as a metal or by making direct contact with it, but it is preferable to make direct contact from the viewpoint of the effect of ion adsorption. A microphase-separated structure in which regions alternate, or a second continuous phase of the first π-conjugated polymer
A structure in which minute regions of the π-conjugated polymer are dispersed is preferable.
【００１４】本発明において２種類以上のπ共役系高分
子を形成する領域は特に限定されないが、一般にπ共役
系高分子が透明ではないため、画素電極を避けて設置す
ることが望ましい。また、本発明の液晶表示装置はイオ
ン性物質の取り込みを相互に接触した２種類以上のπ共
役系高分子で行うため、物理吸着や化学吸着を利用する
他の方法に比べて一度取り込んだイオン性物質を放し難
いという特徴がある。さらに、本発明ではイオン性物質
の取り込みは２種類以上のπ共役系高分子が形成する局
部電池に類似の効果によって行うため、接触する液晶中
のイオン性物質の量に応じて電流が流れ、その結果、多
量のイオン性物質が含まれる場合には急速に取り込むこ
とができる。In the present invention, the region where two or more kinds of π-conjugated polymers are formed is not particularly limited. However, since the π-conjugated polymer is not generally transparent, it is desirable to avoid the pixel electrode. Further, since the liquid crystal display device of the present invention takes in an ionic substance by two or more kinds of π-conjugated polymers which are in contact with each other, the ion once taken in is compared with other methods utilizing physical adsorption or chemical adsorption. It has the characteristic that it is difficult to release volatile substances. Further, in the present invention, since the ionic substance is taken in by an effect similar to that of a local battery formed by two or more kinds of π-conjugated polymers, an electric current flows according to the amount of the ionic substance in the liquid crystal in contact, As a result, when a large amount of ionic substance is contained, it can be taken up rapidly.
【００１５】本発明においてπ共役系高分子の形成方法
は特に限定されず、従来公知のものが利用できる。この
形成方法としては例えば導電性高分子の溶液を塗布する
方法、あるいは基板上で酸化剤等を用いて芳香族化合物
を直接重合する方法、電極を取り付けて電解重合する方
法、π共役系高分子を真空蒸着等の方法で薄膜化する方
法等が挙げられる。In the present invention, the method for forming the π-conjugated polymer is not particularly limited, and conventionally known ones can be used. Examples of the forming method include a method of applying a solution of a conductive polymer, a method of directly polymerizing an aromatic compound on a substrate by using an oxidizing agent, a method of attaching an electrode and electrolytic polymerization, and a π-conjugated polymer. Examples thereof include a method of forming a thin film by a method such as vacuum deposition.
【００１６】[0016]
【実施例】以下、実施例を挙げて本発明を具体的に説明
するが、本発明はこれら実施例にのみ限定されるもので
はない。The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
【００１７】（実施例１）透明電極としてインジウムチ
ンオキサイド（ＩＴＯ）をスパッタしたガラス表面にポ
リイミド膜からなる配向膜を形成して基板を作成した。
次に基板の配向膜表面に膜厚０．１μm のポリヘキシル
チオフェン、およびポリアニリンの２種類のπ電子共役
系高分子を幅２mmで交互に５本ずつ形成した。これはポ
リヘキシルチオフェンのキシレン溶液、およびポリアニ
リンのＮ−メチルピロリドン溶液を用いて印刷の方法で
行った。得られた２枚の基板をスペーサーを介して５μ
m のセル厚となるように組み立てた。その後、メルク社
製液晶ＺＬＩ−２７８７を注入し、抵抗値を測定したと
ころ、２５℃において１．０×１０12Ωcmと、π共役系
高分子を形成しなかった場合の１．２×１０10Ωcmに比
べて大幅に大きく、電荷保持率も９６％から９９％に改
善された。(Example 1) A substrate was prepared by forming an alignment film made of a polyimide film on a glass surface on which indium tin oxide (ITO) was sputtered as a transparent electrode.
Then, two kinds of π-electron conjugated polymers of polyhexylthiophene and polyaniline having a film thickness of 0.1 μm were formed on the surface of the alignment film on the substrate alternately in a width of 2 mm, and five films each were formed alternately. This was done by printing using a solution of polyhexylthiophene in xylene and a solution of polyaniline in N-methylpyrrolidone. 5μ of the obtained two substrates through a spacer
It was assembled to have a cell thickness of m 2. Then, a liquid crystal ZLI-2787 manufactured by Merck & Co., Inc. was injected, and the resistance value was measured to be 1.0 × 10 12 Ωcm at 25 ° C. and 1.2 × 10 10 when the π-conjugated polymer was not formed. It is significantly larger than Ωcm, and the charge retention rate is improved from 96% to 99%.
【００１８】（実施例２）実施例１で得られた基板表面
に２mm間隔で幅２mmの５本の金電極を真空蒸着法により
作成した。これを０．２５ｍｏｌ／ｌのピロールと０．
１ｍｏｌ／ｌのパラトルエンスルホン酸テトラエチルア
ンモニウムを含むアセトニトリル溶液に浸漬し、ニッケ
ル板を対抗電極として金電極に３Ｖの直流電圧を印加し
て金電極上に膜厚０．２μm のポリピロールを形成し
た。次に全体をアセトンで洗浄し、さらに、ポリピロー
ルが形成された間隙にポリピロールと一部重なるように
ポリオクチルチオフェンのキシレン溶液を塗布し、１０
０℃で乾燥した。このようにして得られた２枚の基板を
実施例１と同様の方法で組み立て、液晶を注入したとこ
ろ、抵抗値は２５℃において６．０×１０12Ωcm、電荷
保持率９８％となり、良好な性能を示した。Example 2 On the surface of the substrate obtained in Example 1, five gold electrodes with a width of 2 mm and a width of 2 mm were formed by a vacuum deposition method. This was mixed with 0.25 mol / l of pyrrole and 0.
It was immersed in an acetonitrile solution containing 1 mol / l tetraethylammonium paratoluenesulfonate, and a direct current voltage of 3 V was applied to the gold electrode using a nickel plate as a counter electrode to form a polypyrrole having a thickness of 0.2 μm on the gold electrode. Next, the whole is washed with acetone, and a xylene solution of polyoctylthiophene is applied to the gap where the polypyrrole is formed so as to partially overlap the polypyrrole.
It was dried at 0 ° C. The two substrates thus obtained were assembled in the same manner as in Example 1 and liquid crystal was injected. The resistance value was 6.0 × 10 12 Ωcm at 25 ° C., and the charge retention rate was 98%, which was excellent. It showed excellent performance.
【００１９】（実施例３）実施例２で得られた金電極を
形成した基板を０．２ｍｏｌ／ｌのチオフェンと０．１
ｍｏｌ／ｌのホウフッ化リチウムを含むベンゾニトリル
溶液に浸漬しニッケル板を対抗電極として金電極に１５
Ｖの直流電圧を印加して、金電極上に０．２μm のポリ
チオフェン膜を形成した。次に、電極を短絡して５時間
脱ドーピングした後、アセトンで洗浄し、さらに、ポリ
チオフェンが形成された間隙にポリチオフェンと一部重
なるようにポリアニリンのＮ−メチルピロリドン溶液を
塗布し、１３０℃で乾燥した。このようにして得られた
２枚の基板を実施例１と同様の方法で組み立て、液晶を
注入したところ、抵抗値は２５℃において２．０×１０
12Ωcm、電荷保持率９９％となり、良好な性能を示し
た。Example 3 The substrate on which the gold electrode obtained in Example 2 was formed was treated with 0.2 mol / l of thiophene and 0.1
It was immersed in a benzonitrile solution containing mol / l lithium borofluoride and a nickel plate was used as a counter electrode for the gold electrode.
A direct current voltage of V was applied to form a 0.2 μm polythiophene film on the gold electrode. Next, after short-circuiting the electrodes and dedoping for 5 hours, the electrodes were washed with acetone, and then the N-methylpyrrolidone solution of polyaniline was applied to the gap where polythiophene was formed so as to partially overlap with polythiophene, and then at 130 ° C. Dried. The two substrates thus obtained were assembled in the same manner as in Example 1 and liquid crystal was injected. The resistance value was 2.0 × 10 at 25 ° C.
The performance was 12 Ωcm and the charge retention rate was 99%, indicating good performance.
【００２０】（実施例４）実施例１で得られた基板表面
に２mm間隔で５本、幅２mmのドデシルベンゼンスルホン
酸第２鉄のメチルアルコール溶液を塗布し、乾燥した。
これをピロール蒸気に曝して膜厚０．２μm のポリピロ
ールを形成した。次に全体をアセトンで洗浄し、さら
に、ポリピロールが形成された間隙にポリピロールと一
部重なるようにポリオクチルチオフェンのキシレン溶液
を塗布し、１００℃で乾燥した。このようにして得られ
た２枚の基板を実施例１と同様の方法で組み立て、液晶
を注入したところ、抵抗値は２５℃において５．０×１
０12Ωcm、電荷保持率９８％となり、良好な性能を示し
た。Example 4 Five ferric dodecylbenzenesulfonic acid ferric methyl alcohol solutions having a width of 2 mm were coated on the surface of the substrate obtained in Example 1 at intervals of 2 mm and dried.
This was exposed to pyrrole vapor to form a polypyrrole having a film thickness of 0.2 μm. Next, the whole was washed with acetone, and a xylene solution of polyoctylthiophene was applied so as to partially overlap the polypyrrole in the gap where the polypyrrole was formed, and dried at 100 ° C. The two substrates thus obtained were assembled in the same manner as in Example 1 and liquid crystal was injected. The resistance value was 5.0 × 1 at 25 ° C.
It showed 0 12 Ωcm and a charge retention rate of 98%, indicating good performance.
【００２１】[0021]
【発明の効果】以上説明したように、本発明によれば電
極を有する２枚の基板間に液晶が充填されている液晶表
示装置において、相互に接触した少なくとも２種類以上
のπ電子共役系高分子が液晶に接して設けられているこ
とにより、液晶表示装置からイオン性不純物を効率的か
つ簡便に除去することができ、表示品位の改善された液
晶表示装置を提供できるため、その効果は大である。As described above, according to the present invention, in a liquid crystal display device in which liquid crystal is filled between two substrates having electrodes, at least two or more π-electron conjugated system heights in contact with each other are used. Since the molecules are provided in contact with the liquid crystal, ionic impurities can be efficiently and easily removed from the liquid crystal display device, and a liquid crystal display device with improved display quality can be provided, which is highly effective. Is.
【図１】本発明による液晶表示装置の一実施例を示す断
面図である。FIG. 1 is a sectional view showing an embodiment of a liquid crystal display device according to the present invention.
１ 上部基板 ２ 液晶 ３ 第１のπ電子共役系高分子 ４ 第２のπ電子共役系高分子 ５ 配向膜 ６ 電極 ７ 基板 1 Upper substrate 2 Liquid crystal 3 First π-electron conjugated polymer 4 Second π-electron conjugated polymer 5 Alignment film 6 Electrode 7 Substrate
───────────────────────────────────────────────────── フロントページの続き (72)発明者 天野 公輔 東京都港区芝五丁目７番１号 日本電気株 式会社内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kosuke Amano 5-7-1, Shiba, Minato-ku, Tokyo NEC Corporation
Claims (2)
れている液晶表示装置において、相互に接触した少なく
とも２種類以上のπ電子共役系高分子が液晶に接して設
けられていることを特徴とする液晶表示装置。1. A liquid crystal display device in which liquid crystal is filled between two substrates having electrodes, and at least two kinds of π-electron conjugated polymers which are in contact with each other are provided in contact with the liquid crystal. Liquid crystal display device characterized by.
オフェンもしくはそれらの誘導体を主鎖骨格に有するも
のよりなることを特徴とする請求項１記載の液晶表示装
置。2. The liquid crystal display device according to claim 1, wherein the π-conjugated polymer is one having pyrrole, benzene, thiophene or a derivative thereof in the main chain skeleton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7127949A JP2725633B2 (en) | 1995-05-26 | 1995-05-26 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7127949A JP2725633B2 (en) | 1995-05-26 | 1995-05-26 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08320471A true JPH08320471A (en) | 1996-12-03 |
| JP2725633B2 JP2725633B2 (en) | 1998-03-11 |
Family
ID=14972631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7127949A Expired - Fee Related JP2725633B2 (en) | 1995-05-26 | 1995-05-26 | Liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2725633B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9670411B2 (en) | 2014-01-14 | 2017-06-06 | Seiko Epson Corporation | Liquid crystal device, method of manufacturing liquid crystal device, and electronic apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0534698A (en) * | 1991-07-29 | 1993-02-12 | Matsushita Electric Ind Co Ltd | Liquid crystal alignment film |
| JPH08211391A (en) * | 1995-02-07 | 1996-08-20 | Showa Denko Kk | Method for imparting orientation property to oriented layer |
-
1995
- 1995-05-26 JP JP7127949A patent/JP2725633B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0534698A (en) * | 1991-07-29 | 1993-02-12 | Matsushita Electric Ind Co Ltd | Liquid crystal alignment film |
| JPH08211391A (en) * | 1995-02-07 | 1996-08-20 | Showa Denko Kk | Method for imparting orientation property to oriented layer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9670411B2 (en) | 2014-01-14 | 2017-06-06 | Seiko Epson Corporation | Liquid crystal device, method of manufacturing liquid crystal device, and electronic apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2725633B2 (en) | 1998-03-11 |
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