JPH05164920A - Phase difference plate and liquid crystal display device - Google Patents
Phase difference plate and liquid crystal display deviceInfo
- Publication number
- JPH05164920A JPH05164920A JP3328760A JP32876091A JPH05164920A JP H05164920 A JPH05164920 A JP H05164920A JP 3328760 A JP3328760 A JP 3328760A JP 32876091 A JP32876091 A JP 32876091A JP H05164920 A JPH05164920 A JP H05164920A
- Authority
- JP
- Japan
- Prior art keywords
- film
- refractive index
- block copolymer
- retardation plate
- liquid crystal
- 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
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- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は液晶表示装置などに用い
られる新規な位相差板に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel retardation plate used for liquid crystal display devices and the like.
【０００２】[0002]
【従来の技術および発明が解決しようとする課題】位相
差板は特開昭６３−１８９８０４、特開平１−９６６２
３、特開平１−１１８８０５などに示されているように
光学的均質性と耐久性を備え、一軸配向性を有する高分
子フィルムであって、液晶表示装置の表示品質を向上さ
せるための光学補償板として一般に用いられている。位
相差板を用いたＳＴＮ型液晶表示装置は、液晶セルを２
枚積層した二層式ＳＴＮ型液晶表示装置に比べ、軽い、
薄い、安価である等の長所を持つ反面、視野角特性が悪
い、白黒のレベルが劣っているなどの短所を有してい
た。これらの短所は位相差板を２枚積層するなどの方法
によりかなり改良されてきたが、視野角特性については
いまだ満足できるレベルに達していない。2. Description of the Related Art A retardation plate is disclosed in JP-A-63-189804 and JP-A-1-9662.
3. A polymer film having optical homogeneity and durability and having uniaxial orientation as shown in JP-A-1-118805, which is an optical compensation for improving the display quality of a liquid crystal display device. It is commonly used as a plate. An STN type liquid crystal display device using a retardation plate has two liquid crystal cells.
Lighter than a two-layer STN type liquid crystal display device with stacked layers,
Although it has advantages such as being thin and inexpensive, it has disadvantages such as poor viewing angle characteristics and poor black and white level. These disadvantages have been considerably improved by a method such as laminating two retardation films, but the viewing angle characteristics have not yet reached a satisfactory level.
【０００３】液晶表示装置の視野角特性は液晶セルの複
屈折性の角度依存性のみならず、位相差板の複屈折性す
なわちレターデーションの角度依存性に大きく依存して
おり、従来の位相差板ではレターデーションの角度変化
が小さいほど好ましいことが知られている。近年、特開
平２−１９１９０４、特開平２−２８５３０３などに示
されているように、一軸延伸時に延伸軸に垂直な方向に
フィルムを収縮させる方法やポリマーの液状物を電界の
印加下で製膜したフィルムを延伸することにより複屈折
率特性を制御する方法、特開平３−８５５１９に示され
ているように電界の印加下で製膜したフィルムを従来の
位相差板に積層するなど様々な方法を用いることによ
り、位相差板のレターデーションの角度変化を小さくし
て視野角特性を改良する検討がなされているが、これら
の方法には量産性に課題があるものが多い。The viewing angle characteristics of a liquid crystal display device depend not only on the angle dependence of the birefringence of the liquid crystal cell but also on the birefringence of the retardation plate, that is, the angle dependence of the retardation. It is known that the smaller the change in retardation angle of the plate, the better. In recent years, as disclosed in JP-A-2-191904, JP-A-2-285303, etc., a method of shrinking a film in a direction perpendicular to a stretching axis during uniaxial stretching, or a method of forming a polymer liquid substance under application of an electric field Of controlling the birefringence characteristic by stretching the formed film, various methods such as laminating a film formed under application of an electric field on a conventional retardation plate as shown in JP-A-3-85519. It has been investigated to reduce the angle change of retardation of the retardation film and improve the viewing angle characteristics by using the above method. However, many of these methods have problems in mass productivity.
【０００４】このような一軸配向性の複屈折性フィルム
の視野角特性を評価するには、セナルモンコンペンセー
ターを装備した偏光顕微鏡において、正の屈折率異方性
を有する複屈折フィルムの場合には遅相軸を、また負の
屈折率異方性を有する複屈折性フィルムの場合には進相
軸をそれぞれ回転軸として傾斜させた状態で測定したレ
ターデーション（Ｒ）と水平な状態で測定したレターデ
ーション（Ｒ0 ）の比（Ｒ／Ｒ0 ）が１．１０となると
きの傾斜角（θ1.10）を用い、この値をそのフィルムの
視野角と称する。レターデーションの角度変化が小さい
ほどこの傾斜角（θ1.10）が大きく、すなわち視野角特
性が良いということになる。In order to evaluate the viewing angle characteristics of such a uniaxially oriented birefringent film, a polarizing microscope equipped with a Senarmont compensator can be used to evaluate the birefringent film having a positive refractive index anisotropy. Is the retardation axis (R) measured in a state in which the slow axis is tilted, and in the case of a birefringent film having negative refractive index anisotropy, the fast axis is the rotation axis. using the retardation inclination angle when the ratio of (R 0) (R / R 0) is 1.10 (θ 1.10), referred to the value as the viewing angle of the film. The smaller the change in retardation angle, the larger the tilt angle (θ 1.10 ), that is, the better the viewing angle characteristic.
【０００５】従来の熱可塑性樹脂を延伸して得られた位
相差板では、縦一軸延伸法によって得られた位相差板で
も４２度までの視野角しか得られていない。In the retardation plate obtained by stretching the conventional thermoplastic resin, the retardation plate obtained by the longitudinal uniaxial stretching method can only obtain a viewing angle of up to 42 degrees.
【０００６】また、液晶表示体の表示特性改良のためＴ
Ｎ方式、ＳＴＮ方式以外にも様々な表示方式が考案され
ている。これらの表示方式には従来の一軸配向性の複屈
折性フィルムのみではなく、フィルム面内には屈折率の
異方性がない即ちＲ0 ＝０ではあるが、フィルム面内の
屈折率とフィルムの厚み方向の屈折率が異なる複屈折性
フィルムからなる位相差板も必要とされている。In order to improve the display characteristics of the liquid crystal display, T
Various display systems have been devised other than the N system and the STN system. These display methods are not limited to the conventional uniaxially oriented birefringent film, but there is no anisotropy of the refractive index in the film plane, that is, R 0 = 0. There is also a need for a retardation plate made of a birefringent film having a different refractive index in the thickness direction.
【０００７】本発明はこれまでにない良好な視野角特性
を有する位相差板、およびフィルム面内の屈折率と厚み
方向の屈折率が異なる位相差板を提供することを目的と
する。It is an object of the present invention to provide a retardation plate having an unprecedented good viewing angle characteristic and a retardation plate having a different refractive index in the film plane and a refractive index in the thickness direction.
【０００８】[0008]
【課題を解決するための手段】以上の問題を解決するた
めに鋭意検討した結果、Ａ−Ｂ型またはＡ−Ｂ−Ａ型ブ
ロック共重合体のミクロ相分離構造を利用することによ
り、効果的にフィルムの厚み方向への配向構造が得ら
れ、このフィルムが面内の屈折率と厚み方向の屈折率が
異なること、およびこのフィルムを従来の位相差板に積
層することにより視野角特性の良好な位相差板が得られ
ること、を発見し本発明を完成するに至った。[Means for Solving the Problems] As a result of extensive studies to solve the above problems, it was found that the use of a micro phase separation structure of an AB type or ABA type block copolymer is effective. The film has an oriented structure in the thickness direction of the film, and the film has a different in-plane refractive index and the refractive index in the thickness direction. By laminating this film on a conventional retardation plate, good viewing angle characteristics can be obtained. It was discovered that such a retardation plate can be obtained, and the present invention has been completed.
【０００９】すなわち本発明は、ラメラ構造を有するブ
ロック共重合体からなる位相差板、およびラメラ構造を
有するブロック共重合体を熱可塑性樹脂からなる位相差
板上に積層したことを特徴とする視野角特性の良好な位
相差板である。That is, the present invention is characterized in that a retardation plate made of a block copolymer having a lamella structure and a block copolymer having a lamella structure are laminated on a retardation plate made of a thermoplastic resin. It is a retardation plate having good angular characteristics.
【００１０】本発明のラメラ構造を形成するＡ−Ｂ型ま
たはＡ−Ｂ−Ａ型ブロック共重合体のＡ部分とＢ部分と
の比は、体積比で０．６６〜１．５の範囲が好ましく、
より好ましくは０．９〜１．１である。The ratio of the A portion to the B portion of the AB type or ABA type block copolymer forming the lamella structure of the present invention is in the range of 0.66 to 1.5 by volume. Preferably
It is more preferably 0.9 to 1.1.
【００１１】本発明のＡ−Ｂ型またはＡ−Ｂ−Ａ型ブロ
ック共重合体としては、固有複屈折を有するものであれ
ば特に限定されないが、透明性などの光学的特性に優れ
たものが好ましく用いられる。例えば、スチレン−２−
ビニルピリジン共重合体、スチレン−イソプレン共重合
体、スチレン−ブタジエン共重合体、α−メチルスチレ
ン−イソプレン−α−メチルスチレン共重合体などがあ
げられる。The AB type or ABA type block copolymer of the present invention is not particularly limited as long as it has intrinsic birefringence, but one having excellent optical characteristics such as transparency is used. It is preferably used. For example, styrene-2-
Examples thereof include vinyl pyridine copolymers, styrene-isoprene copolymers, styrene-butadiene copolymers, α-methylstyrene-isoprene-α-methylstyrene copolymers.
【００１２】本発明のＡ−Ｂ型またはＡ−Ｂ−Ａ型ブロ
ック共重合体は製膜され、単独でまたは位相差板に貼合
されて用いられる。製膜方法に特に限定はないが、溶液
キャスト法、プレス成形法などが好ましく用いられ、製
膜されたフィルムは面内の屈折率と厚み方向の屈折率が
異なる位相差板となる。また、製膜されたフィルムを一
軸方向に延伸して面内の複屈折性を持たせて二軸性の屈
折率異方性を有した位相差板として用いることもでき
る。熱可塑性樹脂からなる位相差板に積層する場合には
その方法に限定はなく、溶液状態から塗布されたり、製
膜後粘着剤を介して貼合されたりする方法などが用いら
れる。The A-B type or A-B-A type block copolymer of the present invention is formed into a film and used alone or by being attached to a retardation plate. The film forming method is not particularly limited, but a solution casting method, a press molding method, or the like is preferably used, and the formed film serves as a retardation plate having a different in-plane refractive index and thickness direction refractive index. Further, the formed film may be stretched in a uniaxial direction to have in-plane birefringence and thus used as a retardation plate having biaxial refractive index anisotropy. When laminating on a retardation plate made of a thermoplastic resin, the method is not limited, and a method such as coating from a solution state or laminating via a pressure-sensitive adhesive after film formation is used.
【００１３】これらの位相差板の膜厚は、積層する液晶
セルまたは従来の位相差板の複屈折性、厚みなどにより
異なり、個々の場合について設定する必要があるが、例
示すると、正の屈折率異方性を有する液晶分子が液晶セ
ルのガラス基板に垂直方向に配向した状態（垂直配向ネ
マチック液晶セルの電界無印加時、ツイステッドネマチ
ック液晶セルの電界印加時など）での複屈折の角度依存
性を補償するために積層する場合には一般に、（ブロッ
ク共重合体よりなる位相差板のフィルム面内の屈折率と
厚み方向の屈折率の差）×（ブロック共重合体よりなる
位相差板の厚み）が０〜２×（液晶分子の固有複屈折）
×（液晶層の厚み）の範囲の値になるようにブロック共
重合体よりなる位相差板の厚みを設定する、また負の屈
折率異方性を有する熱可塑性樹脂からなる一軸延伸フィ
ルムによる従来の位相差板の視野角を向上させるために
積層する場合には一般に、（ブロック共重合体よりなる
位相差板のフィルム面内の屈折率と厚み方向の屈折率の
差）×（ブロック共重合体よりなる位相差板の厚み）が
０〜（一軸延伸フィルムの複屈折率）×（一軸延伸フィ
ルムの厚み）の範囲の値になるようにブロック共重合体
よりなる位相差板の厚みを設定するなどが挙げられる。The film thickness of these retardation films differs depending on the birefringence and thickness of the liquid crystal cell to be laminated or the conventional retardation film, and it is necessary to set for each case. Angular dependence of birefringence in the state where liquid crystal molecules with refractive index anisotropy are vertically aligned on the glass substrate of the liquid crystal cell (when no electric field is applied to the vertically aligned nematic liquid crystal cell, when an electric field is applied to the twisted nematic liquid crystal cell, etc.) In the case of laminating in order to compensate for the property, (the difference between the in-plane refractive index of the phase difference plate made of the block copolymer and the refractive index in the thickness direction) × (the phase difference plate made of the block copolymer) Thickness) is 0 to 2x (specific birefringence of liquid crystal molecules)
The thickness of the retardation film made of the block copolymer is set so that the value is in the range of x (the thickness of the liquid crystal layer), and the conventional uniaxially stretched film made of a thermoplastic resin having negative refractive index anisotropy is used. In the case of laminating in order to improve the viewing angle of the retardation plate, generally, (the difference between the in-plane refractive index of the retardation film made of the block copolymer and the refractive index in the thickness direction) × (block co-weight The thickness of the retardation plate made of the block copolymer is set such that the thickness of the retardation plate made of the united product is in the range of 0 to (the birefringence of the uniaxially stretched film) x (the thickness of the uniaxially stretched film). You can list them.
【００１４】本発明のラメラ構造を有するブロック共重
合体を積層する熱可塑性樹脂からなる位相差板として
は、ラメラ構造を有するブロック共重合体が正の固有複
屈折を有する場合には、正の固有複屈折を有する熱可塑
性樹脂が、ラメラ構造を有するブロック共重合体が負の
固有複屈折を有する場合には、負の固有複屈折を有する
熱可塑性樹脂が用いられる。例えば、正の固有複屈折を
有する熱可塑性樹脂としては、ポリカーボネート、ポリ
スルホンなどが、負のそれとしては、ポリスチレン、ポ
リα−メチルスチレン、ポリ２−ビニルピリジン、ポリ
ビニルナフタレン、ポリメチルメタクリレートなどがあ
げられる。The retardation plate made of a thermoplastic resin for laminating the block copolymer having a lamella structure of the present invention is positive when the block copolymer having a lamella structure has a positive intrinsic birefringence. When the block copolymer having a lamella structure has a negative intrinsic birefringence, the thermoplastic resin having an intrinsic birefringence is a thermoplastic resin having a negative intrinsic birefringence. For example, examples of the thermoplastic resin having positive intrinsic birefringence include polycarbonate and polysulfone, and examples of the negative resin include polystyrene, poly α-methyl styrene, poly 2-vinyl pyridine, polyvinyl naphthalene, and polymethyl methacrylate. Be done.
【００１５】本発明のＡ−Ｂ型またはＡ−Ｂ−Ａ型ブロ
ック共重合体は一般に以下の様な方法により製造でき
る。すなわち、新実験化学講座１９巻 高分子化学Ｉ、
１１１〜１１６頁（日本化学会編 １９７８年 丸善）
に記述されているように、末端官能性プレポリマーを合
成しその末端官能基をもう一方のプレポリマーとカップ
リングする方法、プレポリマーの末端官能基を開始剤と
してモノマーの逐次付加を行う方法があげられる。The AB type or ABA type block copolymer of the present invention can be generally produced by the following method. That is, New Experimental Chemistry Course Vol. 19 Polymer Chemistry I,
111-116 (Chemical Society of Japan, 1978 Maruzen)
As described in, a method of synthesizing an end-functional prepolymer and coupling the end functional group with another prepolymer, and a method of sequentially adding monomers using the end functional group of the prepolymer as an initiator are available. can give.
【００１６】本発明に用いるラメラ構造をとったフィル
ム、およびラメラ構造をとったフィルムに積層する位相
差板の延伸方法としては、レターデーションの均質性が
得られる延伸方法であれば、テンター延伸法、ロール間
延伸法、ロール間圧縮延伸法など公知の方法のいずれを
用いてもよい。As a stretching method of the film having a lamellar structure used in the present invention and the retardation plate laminated on the film having a lamellar structure, a tenter stretching method can be used as long as it is a stretching method capable of obtaining uniform retardation. Any of known methods such as a roll-to-roll stretching method and a roll-to-roll compression stretching method may be used.
【００１７】本発明の位相差板を液晶表示装置に装着す
る方法は特に限定されるものではなく、位相差板の片面
または両面に粘着剤などを施し、液晶セルまたは／およ
び偏光板と貼合するなどの方法を用いればよい。位相差
板のどちらが液晶セル側に配置されてもよく、また上偏
光板と液晶セルの間または下偏光板と液晶セルの間のど
ちらに配置されてもよい。The method for mounting the retardation plate of the present invention on a liquid crystal display device is not particularly limited, and an adhesive or the like is applied to one or both sides of the retardation plate to bond it to a liquid crystal cell or / and a polarizing plate. The method of doing so may be used. Either of the retardation films may be arranged on the liquid crystal cell side, or may be arranged between the upper polarizing plate and the liquid crystal cell or between the lower polarizing plate and the liquid crystal cell.
【００１８】[0018]
【作用】Ａ−Ｂ型またはＡ−Ｂ−Ａ型ブロック共重合体
においては、重合時のＡモノマーとＢモノマーの組成比
により、その相分離構造が変化して、一方の相が球状に
他方の相の中に分散している構造、一方の相が棒状に他
方の相の中に分散している構造、ＡおよびＢ相が交互に
層状に積層したラメラ構造をとるようになることが知ら
れている（例えば、ポリマーアロイ基礎と応用（高分子
学会編 １９８１年 東京化学同人）１９６〜２００
頁）。このうちラメラ構造を形成するためにはＡ−Ｂ型
またはＡ−Ｂ−Ａ型ブロック共重合体のＡ部分とＢ部分
との比は、体積比で０．６６〜１．５の範囲が好まし
く、より好ましくは０．９〜１．１である。ラメラ構造
をとった場合、高分子加工３９巻１０号（１９９０年）
４８９〜４９６頁に記載されているようにＡおよびＢの
高分子の主鎖はラメラ層に対して垂直方向に伸び、かつ
ラメラ面内方向には収縮した構造をとることが知られて
いる。キャスト製膜法など剪断力の小さい方法でミクロ
相分離構造をとるように製膜すれば、ラメラ面はフィル
ム面に平行方向に配向し、Ａ−Ｂ型またはＡ−Ｂ−Ａ型
ブロック共重合体の主鎖はフィルム面に対して垂直方向
に配向することになる。In the A-B type or A-B-A type block copolymer, the phase separation structure changes depending on the composition ratio of the A monomer and the B monomer at the time of polymerization, and one phase becomes spherical. It is known that a structure in which the phases are dispersed in one phase, a structure in which one phase is dispersed in a rod shape in the other phase, and a lamella structure in which the A and B phases are alternately laminated in layers are known. 196-200 (for example, Polymer Alloy Fundamentals and Applications, edited by The Polymer Society of Japan 1981 Tokyo Kagaku Dojin).
page). Among these, in order to form a lamella structure, the ratio of the A portion to the B portion of the AB type or ABA type block copolymer is preferably in the range of 0.66 to 1.5 by volume ratio. , And more preferably 0.9 to 1.1. When the lamella structure is adopted, polymer processing 39 volume 10 (1990)
As described on pages 489 to 496, it is known that the main chains of the polymers A and B extend in the direction perpendicular to the lamella layer and contract in the in-plane direction of the lamella. If a film is formed by a method such as a cast film forming method with a small shearing force so as to have a microphase-separated structure, the lamella surface is oriented in the direction parallel to the film surface, and the A-B type or A-B-A type block copolymerization is performed. The main chain of the united body is oriented in the direction perpendicular to the film surface.
【００１９】Ａ−Ｂ型またはＡ−Ｂ−Ａ型ブロック共重
合体が固有複屈折を有するために、本フィルムはフィル
ム面内には屈折率の異方性がない即ちＲ0 ＝０ではある
が、フィルム面内の屈折率とフィルムの厚み方向の屈折
率が異なる位相差板としての性能を発現している。ま
た、熱可塑性樹脂からなる位相差板に積層した場合、レ
ターデーションの角度変化が小さくなり、本発明のこれ
までにない良好な視野角特性を有する位相差板としての
性能を発現している。Since the A-B type or A-B-A type block copolymer has an intrinsic birefringence, the film has no anisotropy of refractive index in the film plane, that is, R 0 = 0. However, it exhibits the performance as a retardation plate in which the in-plane refractive index and the film thickness direction refractive index are different. Further, when laminated on a retardation plate made of a thermoplastic resin, the change in retardation angle becomes small, and the performance of the present invention as a retardation plate having unprecedented good viewing angle characteristics is exhibited.
【００２０】[0020]
【発明の効果】本発明により、θ1.10が４２度以上の良
好な視野角特性を有する位相差板を容易に得ることが可
能となる。また、フィルム面内の複屈折性がなく、面内
の屈折率が厚み方向の屈折率より大きい位相差板を容易
に得ることが可能となる。これらを補償板として用いる
ことにより、液晶表示装置の表示特性を著しく向上させ
ることができる。According to the present invention, it is possible to easily obtain a retardation plate having a good viewing angle characteristic of θ 1.10 of 42 degrees or more. Further, it is possible to easily obtain a retardation plate having no in-plane birefringence and having an in-plane refractive index larger than that in the thickness direction. By using these as the compensating plate, the display characteristics of the liquid crystal display device can be significantly improved.
【００２１】[0021]
【実施例】以下実施例により本発明を詳細に説明する
が、本発明はこれに限定されるものではない。The present invention will be described in detail with reference to the following examples, but the present invention is not limited thereto.
【００２２】実施例１ ポリマージャーナル（Ｐｏｌｙｍｅｒ Ｊｏｕｒｎａ
ｌ）１８巻４９３頁（１９８６）記載の方法を用いて合
成したスチレン−２−ビニルピリジンブロック共重合体
（分子量１０８０００（数平均），体積比０．５１／
０．４９）をピリジンを溶媒としてキャスト製膜し、厚
さ１１０μｍのフィルムを得た。このフィルムは面内の
屈折率と厚み方向の屈折率の差が１．５２×１０-3であ
り、屈折率の差と厚みの積は１６７ｎｍであった。ま
た、ポリスチレンフィルム（ＨＲシート、大日本インキ
（株）製）を粉砕し、１５％ジクロロエタン溶液を作
り、キャスト法により製膜したフィルムをテンター延伸
法により１３５℃で２．８倍に延伸してＲ0 ＝５４９ｎ
ｍ、θ1.10＝３５度、厚み２８μｍの複屈折性フィルム
を得た。このポリスチレンフィルムに上記ブロック共重
合体フィルムを貼合した位相差板は、Ｒ0 ＝５４９ｎｍ
でθ1.10＝５１度と良好な視野角特性を示した。Example 1 Polymer Journal
l) Styrene-2-vinylpyridine block copolymer synthesized by the method described in Vol. 18, page 493 (1986) (molecular weight 108000 (number average), volume ratio 0.51 /
0.49) was cast into a film using pyridine as a solvent to obtain a film having a thickness of 110 μm. The difference between the in-plane refractive index and the thickness direction refractive index of this film was 1.52 × 10 −3 , and the product of the refractive index difference and thickness was 167 nm. Further, a polystyrene film (HR sheet, manufactured by Dainippon Ink and Chemicals, Inc.) was crushed to make a 15% dichloroethane solution, and the film formed by the casting method was stretched 2.8 times at 135 ° C. by the tenter stretching method. R 0 = 549n
A birefringent film with m, θ 1.10 = 35 degrees and a thickness of 28 μm was obtained. The retardation plate obtained by laminating the block copolymer film on the polystyrene film had R 0 = 549 nm.
At θ 1.10 = 51 degrees, a good viewing angle characteristic was exhibited.
【００２３】実施例２ 実施例１で用いたスチレン−２−ビニルピリジンブロッ
ク共重合体をピリジンを溶媒としてキャスト製膜し、厚
さ１１８μｍのフィルムを得た。このフィルムは面内の
屈折率と厚み方向の屈折率の差が１．５２×１０-3であ
り、面内の複屈折性がない位相差板となった。Example 2 The styrene-2-vinylpyridine block copolymer used in Example 1 was cast into a film using pyridine as a solvent to obtain a film having a thickness of 118 μm. This film had a difference between the in-plane refractive index and the thickness direction refractive index of 1.52 × 10 −3 , and was a retardation plate having no in-plane birefringence.
【００２４】実施例３ マクロモレキュールズ（Ｍａｃｒｏｍｏｌｅｃｕｌｅ
ｓ）２巻４５３頁（１９６９）記載の方法を用いて合成
したスチレン−イソプレンブロック共重合体（分子量１
０００００（数平均），体積比０．５０／０．５０）を
１８０℃でプレス成形して厚さ２００μｍのフィルムを
得た。このフィルムは面内の屈折率と厚み方向の屈折率
の差が２．３７×１０-3であり、屈折率の差と厚みの積
は４７４ｎｍであった。実施例１と同様にして得たＲ0
＝５１５ｎｍ、θ1.10＝３５度、厚み２８μｍのポリス
チレンフィルムに上記ブロック共重合体フィルムを貼合
した位相差板は、Ｒ0 ＝５１５ｎｍでθ1.10＝５９度と
良好な視野角特性を示した。Example 3 Macromolecules
s) Styrene-isoprene block copolymer (molecular weight 1) synthesized by the method described in Volume 2, page 453 (1969).
00000 (number average), volume ratio 0.50 / 0.50) was press-molded at 180 ° C. to obtain a film having a thickness of 200 μm. The difference between the in-plane refractive index and the refractive index in the thickness direction of this film was 2.37 × 10 −3 , and the product of the refractive index difference and the thickness was 474 nm. R 0 obtained in the same manner as in Example 1.
= 515 nm, θ 1.10 = 35 °, and a retardation plate obtained by laminating the above block copolymer film on a polystyrene film having a thickness of 28 μm showed good viewing angle characteristics of θ 1.10 = 59 ° at R 0 = 515 nm.
【００２５】実施例４ 実施例３で用いたスチレン−イソプレンブロック共重合
体を１８０℃でプレス成形して厚さ２００μｍのフィル
ムを得た。このフィルムは面内の屈折率と厚み方向の屈
折率の差が２．３７×１０-3であり、面内の複屈折性が
ない位相差板となった。Example 4 The styrene-isoprene block copolymer used in Example 3 was press-molded at 180 ° C. to obtain a film having a thickness of 200 μm. This film had a difference between the in-plane refractive index and the thickness direction refractive index of 2.37 × 10 −3 , and was a retardation plate having no in-plane birefringence.
【００２６】比較例１ 実施例１と同様にして製膜したポリスチレンフィルムを
テンター延伸法により１３５℃で２．８倍に延伸して得
た複屈折性フィルムは、Ｒ0 ＝５１５ｎｍでθ 1.10＝３
５度であった。Comparative Example 1 A polystyrene film formed in the same manner as in Example 1 was used.
Obtained by stretching 2.8 times at 135 ° C by the tenter stretching method
The birefringent film is R0= Θ at 515 nm 1.10= 3
It was 5 degrees.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 新堂 忠 大阪府高槻市塚原２丁目10番１号 住友化 学工業株式会社内 (72)発明者 松下 裕秀 愛知県名古屋市昭和区狭間町27番地 (72)発明者 野田 一郎 愛知県名古屋市緑区黒沢台４丁目505番地 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Shindo 2-10-1 Tsukahara, Takatsuki City, Osaka Prefecture Sumitomo Kagaku Kogyo Co., Ltd. (72) Inventor Hirohide Matsushita 27, Asama-cho, Showa-ku, Nagoya, Aichi Prefecture (72) Inventor Ichiro Noda 4-505 Kurosawadai, Midori-ku, Nagoya, Aichi
Claims (4)
いた位相差板。1. A retardation plate using a block copolymer having a lamella structure.
可塑性樹脂からなる位相差フィルム上に積層したことを
特徴とする請求項１に記載の位相差板。2. The retardation plate according to claim 1, wherein a block copolymer having a lamella structure is laminated on a retardation film made of a thermoplastic resin.
可塑性樹脂からなる位相差フィルムが共に負の屈折率異
方性を持つことを特徴とする請求項２に記載の位相差
板。3. The retardation plate according to claim 2, wherein both the block copolymer having a lamella structure and the retardation film made of a thermoplastic resin have negative refractive index anisotropy.
積層してなる液晶表示装置。4. A liquid crystal display device comprising the retardation plate according to claim 1, 2 or 3 laminated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3328760A JP3031014B2 (en) | 1991-12-12 | 1991-12-12 | Phase difference plate and liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3328760A JP3031014B2 (en) | 1991-12-12 | 1991-12-12 | Phase difference plate and liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05164920A true JPH05164920A (en) | 1993-06-29 |
| JP3031014B2 JP3031014B2 (en) | 2000-04-10 |
Family
ID=18213846
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3328760A Expired - Lifetime JP3031014B2 (en) | 1991-12-12 | 1991-12-12 | Phase difference plate and liquid crystal display |
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| Country | Link |
|---|---|
| JP (1) | JP3031014B2 (en) |
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