JP2003025414A - Method for manufacturing inclined phase difference film, optical member, and liquid crystal display device - Google Patents

Method for manufacturing inclined phase difference film, optical member, and liquid crystal display device

Info

Publication number
JP2003025414A
JP2003025414A JP2001221267A JP2001221267A JP2003025414A JP 2003025414 A JP2003025414 A JP 2003025414A JP 2001221267 A JP2001221267 A JP 2001221267A JP 2001221267 A JP2001221267 A JP 2001221267A JP 2003025414 A JP2003025414 A JP 2003025414A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
film
difference
crystal
liquid
phase
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
Application number
JP2001221267A
Other languages
Japanese (ja)
Other versions
JP4798679B2 (en )
Inventor
Kazuyoshi Tsuchimoto
Hiroyuki Yoshimi
裕之 吉見
一喜 土本
Original Assignee
Nitto Denko Corp
日東電工株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date

Links

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid crystal display device excellent in the visibility of contrast, black and white display or the like within a wide visual angle range by developing a method for manufacturing an inclined phase difference film capable of preventing the lowering of visibility in the liquid crystal display device caused by a visual angle change within a wide azimuth range and capable of easily and stably forming a large area article excellent in quality.
SOLUTION: The method for manufacturing the inclined phase difference film (5) has at least a process for supplying a light pervious film (2) comprising a thermoplastic resin through the nip between a rubber roll (3) of which the surface is coated with a metal and a metal roll (4) in such a state that the film (2) has a temperature which is 50% or more of the melting point of the film. An optical member comprising a laminate comprising at least one inclined phase difference film and a polarizing plate and the liquid crystal display device wherein at least one inclined phase difference film or this film and the polarizing plate are provided on at least the single surface a liquid crystal cell are also disclosed.
COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】 【0001】 【発明の技術分野】本発明は、液晶表示装置のコントラストや表示色の視角特性等の改善に好適な傾斜型位相差フィルムの製造方法、及びそれを用いた光学部材と液晶表示装置に関する。 BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention, use a method of manufacturing a suitable inclined retardation film to improve the like contrast and display color of the viewing angle characteristics of the liquid crystal display device, and it an optical member and a liquid crystal display device had. 【0002】 【従来の技術】TN(ツイストネマチック)型やSTN [0002] TN (twisted nematic) type or STN
(スーパーツイストネマチック)型等の液晶セルを用いたTFT型やMIM型等の液晶表示装置が、応答速度性や表示の高コントラスト性等に着目されてワードプロセツサやパーソナルコンピュータ等のOA機器などの種々の装置の表示手段として広く普及している。 (Super twisted nematic) type such as a TFT type or MIM type liquid crystal display device using the liquid crystal cell is, is focused on the response speed resistance and display high contrast and the like of word processing Seth such service, a personal computer, or the like OA equipment It is widely used as display means of various devices. しかし見る角度(視角)、特に斜めからの視角におけるコントラストの低下や画面の着色化等による視認性の低下が大きい難点があり、その改善が強く要望されている。 But the viewing angle (viewing angle), in particular there are difficulties lowering of visibility is greater by coloration, etc. of the lowering and screen contrast in viewing angle in the oblique, desire the improvement strongly. 【0003】従来、前記視角特性の改善策として液晶セルに対し位相差板を配置する方式が知られていた(特開平4−229828号公報、特開平4−258923号公報)。 Conventionally, the viewing angle characteristics improvement as a method of placing a retardation plate to the liquid crystal cell was known in (JP-A-4-229828 and JP-Hei 4-258923). しかしその位相差板では全方位における視角特性の改善が困難で、ある方位での改善効果に乏しい問題点があった。 However, the in the phase difference plate is difficult to improve the viewing angle characteristic in all directions, there is a poor problem in improvement of a certain orientation. 【0004】前記に鑑みて、屈折率楕円体の主屈折率方向を法線方向に対し傾斜させて液晶分子のチルトに対処しうるようにした傾斜型位相差板、又は押出成形ロッドを中心軸に対し斜め切断してなる主軸三方向の屈折率が全て異なる位相差板を用いる方式が提案されている(特開平6−75116公報、特開平6−174920公報)。 [0004] In view of the above, inclined phase plate the principal refractive index direction is inclined with respect to the normal direction so as to be able to cope with tilt of the liquid crystal molecules of the refractive index ellipsoid, or the center axis extrusion rod obliquely cut and become main axis three directions refractive index is a method of using all different retardation plate has been proposed to (JP-6-75116, JP-a No. 6-174920 Publication). しかしながら前者はその位相差板の形成が困難であり、後者は液晶表示装置等への適用に要する面積を有する位相差板が得られ難い問題点があった。 However the former is difficult to form the phase difference plate, the latter had hardly problems retardation plate is obtained having an area required for the application to a liquid crystal display device or the like. 【0005】一方、光軸が厚さ方向に対して傾斜する傾斜型位相差フィルムの製造方法としては、周速の異なるピンチロールを介した剪断力で延伸処理する方法が知られていた(特開平6−222213公報)。 On the other hand, as a method for producing inclined retardation film optical axis is inclined with respect to the thickness direction, a method of stretching a shear force through different pinch roll peripheral speeds have been known (JP No. 6-222213 Publication). しかしながら周速差の管理が難しくて精度の維持が困難であり、付与できる剪断力や延伸配向の温度に乏しくて前記光軸の傾斜角度が小さく、かつその角度のバラツキが大きくて視角特性の改善効果に乏しく、またフィルム表面にロールとの接触傷が発生しやすくて液晶表示の品位を低下させる問題点などがあった。 However it is difficult to maintain are difficult accuracy peripheral speed difference, small inclination angle of the optical axis poor temperature shear and stretch orientation can be imparted, and improvement of viewing angle characteristics large variation of the angle poor effect and contact scratches the roll surface of the film there is such a problem to lower the liquid crystal display quality of easily generated point. 【0006】 【発明の技術的課題】本発明は、液晶表示装置における視認性の視角変化による低下を広範囲の方位で防止でき、品質に優れる大面積物も容易に安定して形成できる傾斜型位相差フィルムの製造方法を開発して、広い視角範囲でコントラストや白黒表示等の視認性に優れる液晶表示装置を得ることを課題とする。 [0006] The present invention technical problem of the invention] is a reduction due to visibility of the viewing angle changes in the liquid crystal display device can be prevented in a wide range of orientations, large-area product be easily and stably inclined position which can be formed with excellent quality retardation film to develop a method of manufacturing, it is an object to provide a liquid crystal display device excellent in visibility such as contrast and black-and-white display with a wide viewing angle range. 【0007】 【課題の解決手段】本発明は、表面を金属でコートしたゴムロールと金属ロールとの間に、熱可塑性樹脂による透光性フィルムをその融点の50%以上の温度を有する状態で供給して通過させることにより、当該フィルムにおける光軸を厚さ方向に対して傾斜させる工程を少なくとも有することを特徴とする傾斜型位相差フィルムの製造方法、及びその方法による傾斜型位相差フィルムの1 [0007] A solution means of the present invention, the surface between the rubber roll and a metal roll coated with a metal, supplying the light-transmitting film according to the thermoplastic resin in a state having a 50% or more of the temperature of the melting point by to pass, the first inclined retardation film according to the inclined method of manufacturing a retardation film, and a method characterized by having at least a step of tilting with respect to the thickness direction of the optical axis in the film
枚又は2枚以上と偏光板との積層体からなることを特徴とする光学部材、並びに前記方法による傾斜型位相差フィルムの1枚若しくは2枚以上又はそれと偏光板を液晶セルの少なくとも片側に有することを特徴とする液晶表示装置を提供するものである。 A sheet or optical member, characterized in that a laminate of two or more and the polarizing plate, as well as one or two or more or the polarizing plate of the inclined retardation film according to the method on at least one side of the liquid crystal cell it is intended to provide a liquid crystal display device according to claim. 【0008】 【発明の効果】本発明によれば、当該ロール間を通過させる際に異質ロールによる弾性率の相違、ないしロールの変形のしやすさの相違に基づいて一対のロール表面の間に非対称な変形を生じ、一対のロールを等速回転させた場合にもロールとの接触部分を介してフィルムに対し剪断力を負荷することができ、それによりフィルムの光軸を厚さ方向に対して傾斜させることができる。 According to the present invention, the difference in elastic modulus by extraneous roll when passing between the rolls, or on the basis of the difference in the ease of roll deformation between a pair of roll surface cause asymmetric deformation, through the contact portion between the rolls even when rotating at a constant speed a pair of rolls can be loaded with shear forces to the film, thereby to the thickness direction of the optical axis of the film it can be inclined Te. 従ってロール間の速度管理が容易で処理精度を高度に維持でき、液晶表示装置等への適用が可能な大面積の傾斜型位相差フィルムも容易に安定して製造効率よく形成することができる。 Thus speed management between rolls can be highly maintained easy processing accuracy, inclined retardation film of large area can be applied to a liquid crystal display device or the like can be easily and stably formed with high production efficiency. 【0009】またフィルムを高温状態でロール間に供給でき、かつ大きい剪断力の負荷も容易であることより、 [0009] than that of the can feed between the rolls at a high temperature, and a large shear load is also easy film,
光軸の傾斜角度を大きくすることも可能でその傾斜角度を容易に制御でき、その傾斜角のバラツキも小さくて品質に優れた傾斜型位相差フィルムを得ることができる。 The angle of inclination is also possible to increase the inclination angle of the optical axis can be easily controlled, it is possible to obtain the inclined retardation film having excellent quality smaller variation in the inclination angle.
さらに両ロールとも金属表面を有することよりフィルム表面にロールとの接触傷が生じ難く、液晶表示装置等の表示品位も低下させ難い。 Hardly occurs contact scratches with roll than the film surface further having both roll the metal surface, hardly even display quality such as a liquid crystal display device is lowered. 【0010】前記の結果、光軸の傾斜に基づいて、図2 [0010] The results, based on the inclination of the optical axis, FIG. 2
に例示した如くフィルム面に対する法線(フィルム厚方向)として当該フィルム面内の光軸(遅相軸又は/及び進相軸)51の上に想定される法線面Aを基準とした左右において、同じ傾斜角θの透過光B、Cにおける複屈折光の位相差が相違する特性、すなわち位相差の非対称特性を示す傾斜型位相差フィルムを得ることができ、それを用いて液晶セルの複屈折性に基づく視角による視認性の変化を広範囲の方位にわたり高度に補償できて、広い視角範囲でコントラストや白黒表示等の視認性に優れる液晶表示装置を得ることができる。 In the left and right relative to the normal plane A which is assumed on the normal optical axis of the film plane as (film thickness direction) (the slow axis and / or fast axis) 51 with respect to the film surface as illustrated in , the transmitted light B having the same inclination angle theta, characteristics different phase difference of the birefringent light in C, that it is possible to obtain an inclined retardation film showing the asymmetrical characteristics of the phase difference, birefringence of the liquid crystal cell using the same made highly compensated visibility changes depending on the viewing angle based on the refractive over a wide range of orientations, it is possible to obtain a liquid crystal display device excellent in visibility such as contrast and black-and-white display with a wide viewing angle range. なお前記から明らかな如く、本発明において傾斜する光軸とは、フィルム面内にない主屈折率の方向、従ってフィルムの厚さ方向に対して傾斜する主屈折率の方向を意味する。 Note As is clear from above, the optical axis tilts in the present invention, the direction of the principal refractive index no in the film plane, thus means the direction of the principal refractive index inclined to the thickness direction of the film. 【0011】 【発明の実施形態】本発明による製造方法は、表面を金属でコートしたゴムロールと金属ロールとの間に、熱可塑性樹脂による透光性フィルムをその融点の50%以上の温度を有する状態で供給して通過させることにより、 [0011] the production method according to the present invention embodiments of the Invention, the surface between the rubber roll and a metal roll coated with a metal, having a 50% or more of the temperature of the melting point of the light-transmitting film according to the thermoplastic resin by passage to supply state,
当該フィルムにおける光軸を厚さ方向に対して傾斜させる工程を少なくとも有して、傾斜型位相差フィルムを得るためのものである。 A step of tilting the optical axis with respect to the thickness direction of the film at least having, is for obtaining a inclined retardation film. 【0012】前記方法の実施は、例えば別途に形成した透光性フィルムを熱風やヒータ等の適宜な加熱手段で所定温度に加熱して当該ロール間に供給する方式などにても行いうるが、省エネルギー化等の点より好ましい方式は、溶融押出法にて透光性フィルムを連続成形しつつ、 [0012] embodiment of the method, for example, may also be made in such manner is supplied between the rolls is heated to a predetermined temperature by a suitable heating means such as hot air or a heater separately-formed light-transmitting film, preferred methods from the viewpoint of energy saving, etc., while continuously molding a translucent film using a melt extrusion method,
その成形フィルムが成形温度の50%以上の温度を維持するうちにそれを当該ロール間に供給する方式である。 The forming film is a method for supplying it between the rolls while maintaining 50% or more of the temperature of the molding temperature. 【0013】前記の連続成形方式による工程例を図1に示した。 [0013] showing processes example by the continuous molding method in FIG. これによれば、熱可塑性樹脂を溶融押出法によるTダイ1を介し押出して透光性フィルム2に連続成形しつつ、その成形フィルム2を直下に配置した一対のピンチロール3、4の間に順次連続供給して通過させることにより、目的とする処理がなされて光軸が厚さ方向に対し傾斜した傾斜型位相差フィルム5が得られる。 According to this, the thermoplastic resin is extruded through a T-die 1 by a melt extrusion method while continuous molding on a transparent film 2, between a pair of pinch rolls 3, 4 directly under the formed film 2 by passing sequentially continuously fed, it is inclined retardation film 5 which process is inclined relative made that the light axis is a thickness direction of interest are obtained. 【0014】前記のピンチロールは、ゴム層31の表面を金属でコート32したゴムロール3と金属ロール4からなる。 [0014] The pinch roll becomes the surface of the rubber layer 31 from the rubber roll 3 and a metal roll 4 coated 32 with a metal. そのゴムロールとしては、例えばシリコーンゴム等の適宜なゴムからなるロールの表面に、金属ベルトを装着したもの、あるいは金属メッキ処理を施したものなどの適宜なものを用いうる。 As the rubber roll, for example, on the surface of the roll made of an appropriate rubber such as silicone rubber, those equipped with a metal belt, or may use appropriate ones, such as those having been subjected to metal plating. また金属ロールとしてもロール層の全体を金属で形成してなる適宜なものを用いうる。 Also it can be used an appropriate but also by forming a whole of the roll layer by metal as a metal roll. 【0015】すなわち前記のゴムロールと金属ロールの組合せは、そのロール間を透光性フィルムが通過する際に、表面が変形しやすいゴムロールと変形しにくい金属ロールとに基づく変形のしやすさの相違により、ロール表面の間に非対称な変形を生じさせることを目的とする。 [0015] That combination of the rubber rollers and metal roll, between the rolls when the translucent film passes, ease differences of the surface is based on easily and not easily deformable metal roll and rubber roll Deformation Accordingly, an object to generate an asymmetrical deformation during roll surface. その非対称な変形により透光性フィルムに剪断力を負荷してその光軸を厚さ方向に対し傾斜させることができる。 And load a shearing force to the translucent film by the asymmetric deformation can be tilted its optical axis with respect to the thickness direction. 従って当該組合せは、斯かる非対称な変形を生じうるものであればよい。 Thus the combination may as long as it can cause such asymmetric deformation. 【0016】なおゴムロールの表面に設ける金属コートは、金属ロールの使用と同様にその金属層による平滑な表面特性等を利用して、透光性フィルムがロール間を通過する際にその表面が傷付くことの防止を目的とする。 [0016] Note that the metal coating provided on the surface of the rubber roll, utilizing a smooth surface properties by the use as well as the metal layer of a metal roll or the like, scratched the surface when the light-transmitting film passes between rolls for the purpose of prevention of that stick.
従ってメッキ層等の薄膜にても目的を達成することができる。 Therefore it is possible to achieve the object even at thin plating layer. 一般的な前記金属コートの厚さは、上記したゴムロールの易変形性の維持等の点より5μm〜10mm、就中10μm〜5mm、特に30μm〜3mmである。 The thickness of the general the metal coat, 5Myuemu~10mm from the point of view of maintenance or the like of the easily deformable rubber roll as described above, especially 10Myuemu~5mm, in particular 30Myuemu~3mm. 【0017】当該ゴムロールと金属ロールは、それらの間を通過する透光性フィルムに対して上記した剪断力が作用するようにピンチ式に配置される。 [0017] The rubber roll and a metal roll, shearing forces described above is placed in a pinch-type to act on the light-transmitting film passing between them. そのロール間のギャップは、透光性フィルムの厚さに応じて適宜に決定される。 Gap between the rolls may be appropriately determined according to the thickness of the light-transmitting film. 一般には透光性フィルムの厚さの10〜300 Generally, the thickness of the light-transmitting film 10 to 300
%、就中50〜200%、特に70〜150%のギャップとされる。 %, Especially from 50 to 200%, it is particularly 70-150% of the gap. なお当該ゴムロールと金属ロールの直径は、フィルム幅等に応じて適宜に決定でき、同じであってもよいし、相違していてもよい。 Note the diameter of the rubber roll and a metal roll may be suitably determined depending on the film width, etc., it may be the same or may be different. 一般的な直径は、1 General diameter, 1
0mm〜3m、就中30mm〜1m、特に50〜600mmである。 0mm~3m, inter alia 30mm~1m, is particularly 50~600mm. 【0018】当該ピンチロールによる処理は、その剪断力が有効に作用する温度の透光性フィルムないし成形フィルムに対して行う必要がある。 The process according to the pinch rolls, it is necessary to make to the translucent film or molded film of temperature at which the shear force acts effectively. 一方、当該剪断力による光軸の傾斜化効果は、透光性フィルムないし成形フィルムがそのフィルム形態を維持しうる温度範囲において可及的に高温であるほど大きくなる。 On the other hand, the inclination effect of the optical axis by the shear forces as much as possible the larger is at an elevated temperature in the temperature range where the light-transmitting film or molded film can maintain its film form. 斯かる点より透光性フィルムを形成する熱可塑性樹脂の融点の50%以上の温度を有する状態で、ないし熱可塑性樹脂をフィルムに成形する際の成形温度の50%以上の温度を維持するうちに当該ピンチロール間に供給される。 In a state with 50% or more temperatures the melting point of the thermoplastic resin forming the light transmissive film from the foregoing points, or out of maintaining 50% or more of the temperature of the molding temperature during the molding of the thermoplastic resin film It is supplied between the pinch rolls. なお前記の融点は、溶融により流動性を示す最低温度を意味する。 Note the melting point means the lowest temperature at which shows fluidity by melting. 【0019】図1の例では室温において、当該ピンチロール3、4をTダイ1の直下に配置することで前記した成形温度の50%以上の温度が達成されている。 [0019] at room temperature in the example of FIG. 1, a temperature of more than 50% of the molding temperature mentioned above by placing directly below the pinch rolls 3,4 a T-die 1 is achieved. 当該ピンチロール間に供給する透光性フィルムないし成形フィルムの好ましい温度は、融点又は成形温度の55〜95 The preferred temperature of the light-transmitting film or molded film supplied between the pinch rolls, the melting point or the molding temperature 55 to 95
%、就中60〜90%、特に65〜85%である。 %, Especially 60% to 90%, in particular 65-85%. なおピンチロールは、それを透光性フィルムないし成形フィルムが通過する間に、それに付与した処理が固定化されるように冷却ロールであること、就中、透光性フィルムの融点又は成形フィルムの成形温度の45%以下、特に40%以下、さらには35%以下に冷却するロールであることが好ましい。 Incidentally pinch rolls, while it passes the light-transmitting film or molded film, processing applied thereto are cooled rolls so as to be immobilized, especially, the melting point or molded film of the light-transmitting film 45% of the molding temperature or less, particularly 40% or less, more preferably a roll to cool below 35%. 【0020】ピンチロールによる処理に際し、当該ゴムロールと金属ロールは、等速回転させてもよいし、周速を相違させて回転させてもよい。 [0020] Upon treatment with pinch rolls, the rubber roll and a metal roll may be allowed to constant speed, it may be rotated by different peripheral speed. 前者の等速回転方式は速度管理が容易で品質の均一化に有利であり、剪断力の大きさも溶融時の粘性の低いフィルムの使用や平板ベルトの応用で容易に制御することができる。 The former uniform rotation scheme is advantageous for uniform quality easy speed management, the size of the shear force can also be easily controlled by the application of use and flat belts low viscosity when melted film. 一方、後者の方式では、ロールの変形による剪断力に加えて、周速差による剪断力も作用させることができ、より大きい剪断力の作用下に光軸を傾斜させることができてその傾斜角度の拡大に有利である。 On the other hand, in the latter method, in addition to the shearing force due to deformation of the roll, shearing force due to peripheral speed difference it can also be exerted, the inclination angle can be tilted to the optical axis under the action of larger shearing forces it is advantageous to expand. 【0021】透光性フィルムを形成する熱可塑性樹脂としては、光透過性の適宜なものを用いることができ特に限定はない。 Examples of the thermoplastic resin forming the light-transmitting film is not particularly limited it is possible to use a light transmitting appropriate for. ちなみにその例としてはポリカーボネートやポリアリレート、ポリスルホンやポリエチレンテレフタレート、ポリエチレンナフタレートやポリイミド、ポリエーテルスルホンやポリビニルアルコール、ポリエチレンないしポリプロピレンの如きポリオレフィンやセルロース系ポリマー、ポリスチレンやポリメチルメタクリレート、ポリ塩化ビニルやポリ塩化ビニリデン、ポリアミドやポリノルボルネンなどがあげられる。 Incidentally polycarbonate or polyarylate and examples thereof, polysulfone or polyethylene terephthalate, polyethylene naphthalate, polyimide, polyether sulfone, polyvinyl alcohol, polyethylene or polypropylene, such as polyolefin or cellulosic polymers, polystyrene and polymethyl methacrylate, polyvinyl chloride, poly vinylidene chloride, polyamide, poly norbornene. 【0022】光透過率が70%以上、就中80%以上、 The light transmittance of 70% or more, especially 80% or more,
特に85%以上の透光性フィルムを形成しうる熱可塑性樹脂が好ましい。 In particular the thermoplastic resin is preferably capable of forming more than 85% translucent film. また溶融押出法で均質なフィルムが得られやすく、溶融粘度の低い熱可塑性樹脂が好ましい。 The easy homogeneous film is obtained by melt-extrusion method, less thermoplastic resin is preferable melt viscosity.
さらに延伸方式や厚さ方向配向方式等による配向処理が可能な透光性フィルムを形成しうる熱可塑性樹脂が好ましい。 Further stretching method and the orientation process by the thickness direction orientation method or the like may form a translucent film capable thermoplastic resin is preferable. なお溶融押出法を適用する方式では、溶融粘度の低いものが好ましい。 Note that, in the method of applying the melt extrusion method, preferably having a low melt viscosity. なお透光性フィルムは、溶融押出法のほか、例えば流延法等のキャスティング法などの適宜な方式で形成したものであってよい。 Note translucent film, in addition to the melt extrusion method, may be those formed by a suitable method such as, for example, casting the casting method. 【0023】ピンチロールに供する透光性フィルムの厚さは、目的とする傾斜型位相差フィルムの位相差特性などにより適宜に決定することができる。 [0023] The thickness of the light transmissive film to be subjected to the pinch rolls can be suitably determined by retardation characteristics etc. of the inclined retardation film of interest. 一般的な厚さは5〜500μm、就中10〜350μm、特に20〜20 Typical thickness is 5 to 500 [mu] m, inter alia 10~350Myuemu, especially 20 to 20
0μmである。 It is 0μm. なお位相差は、フィルム厚方向に透過する複屈折の屈折率差(△n)とフィルム厚(d)の積(△n×d)として求めることができる。 Note the phase difference can be obtained as the product (△ n × d) of the refractive index difference between the birefringent transmitted through the film thickness direction (△ n) and film thickness (d). 【0024】液晶表示の視角特性の改善、特に方位の広さなどの点より好ましく用いうる傾斜型位相差フィルムは、図2においてその遅相軸又は進相軸の一方又は両方の光軸51の上に想定される法線面Aを基準とした傾斜角θが40度であるときに基づく当該法線面の左右の斜め透過光B、Cにおける複屈折による位相差の差が10 The improvement of the liquid crystal display of the viewing angle characteristics, in particular the inclined retardation film can be preferably used from the viewpoint of size of the orientation of one or both of the slow axis or the fast axis in FIG. 2 of the optical axis 51 the difference of the phase difference due to birefringence the right and left oblique transmitted light B of the normal plane, in C based on when the tilt angle θ relative to the normal plane a envisaged above is 40 ° 10
nm以上、就中15〜1000nm、特に20〜200nmのものである。 nm or more, and of, inter alia 15~1000nm, especially 20~200nm. 斯かる位相差の差が10nm未満では視角特性の改善効果、特に方位の拡大効果に乏しい場合がある。 The difference of such a phase difference is sometimes poor improvement, particularly the orientation effect of expanding the viewing angle characteristics is less than 10 nm. また表示ムラの発生防止やコントラストの低下防止などの点より好ましい傾斜型位相差フィルムは、位相差の最大値と最小値の差が10nm以下、就中7nm以下、特に5nm以下のものである。 Preferred inclined retardation film from the viewpoint of preventing deterioration in prevention and contrast of display unevenness also less difference 10nm of the maximum value and the minimum value of the phase difference, especially 7nm or less, and in particular of 5nm or less. 【0025】前記において位相差の調整に際しては必要に応じ当該ピンチロール間を通過させた透光性フィルムに対して、自由端や固定端による縦若しくは横の一軸延伸方式や二軸延伸方式、又は厚さ方向配向方式等の適宜な配向処理方式の1種又は2種以上を施してその位相差を制御することもできる。 The phase difference with respect to the light-transmitting film that has passed between the pinch rolls if necessary upon adjustment, vertical or horizontal uniaxial by the free end and the fixed end stretching method or biaxial stretching method in the, or one suitable alignment treatment method such as the thickness direction orientation method or by applying two or more can also control the phase difference. なお前記の厚さ方向配向方式としては、処理対象のフィルムに熱収縮性フィルムを接着して加熱下にその熱収縮性フィルムの収縮力を作用させて処理対象フィルムの厚さ方向の屈折率を変化させる方式などがあげられる。 Incidentally, as the thickness direction orientation method, the refractive index in the thickness direction of the force of contraction by applying processed film of heat-shrinkable film under heat to the film to be processed by bonding a heat-shrinkable film such as a method to change, and the like. 【0026】本発明による傾斜型位相差フィルムは、その単層物や同種又は異種の積層物などとして液晶セルの視野角拡大やコントラスト向上などを目的とした複屈折による位相差の補償などに好ましく用いうる。 The inclined retardation film according to the present invention, preferably the like compensation for phase difference due to birefringence for the purpose of such wide viewing angle and contrast enhancement of a liquid crystal cell as such its monolayers and allogeneic or laminates of different It can be used. その実用に際しては必要に応じて、例えば傾斜型位相差フィルムの片面又は両面に粘着層を設けたものや、偏光板や他の位相差板と積層したもの、あるいは等方性の透明な樹脂層やガラス層等からなる保護層と積層したものなどの適宜な形態の光学部材として適用することもできる。 Its practical when, if necessary, for example, on one or both sides of the inclined retardation film that is provided an adhesive layer and, as laminated with polarizing plate or other retardation plate, or an isotropic transparent resin layer It may be applied as appropriate embodiment of an optical member, such as those or laminated with protective layers made of glass layer or the like. 【0027】図3に前記した偏光板等との積層体からなる光学部材10を例示した。 [0027] The optical member 10 consisting of a laminate of a polarizing plate or the like described above and illustrated in FIG. 5が傾斜型位相差フィルム、7が他の位相差板、9が偏光板であり、6、8は接着層である。 5 is inclined retardation film, 7 another retardation plate 9 is polarizer, 6 and 8 is an adhesive layer. 光学部材の形成に際しては1枚又は2枚以上の傾斜型位相差フィルム、さらには1枚又は2枚以上の他の位相差板を用いることができる。 One or two or more inclined retardation film in the formation of the optical member, and further it is possible to use one or two or more other retardation film. 傾斜型位相差フィルムや他の位相差板の2枚以上の使用は、補償効果の向上などを目的とする。 The use of two or more of the inclined retardation film or other retardation plate, the purpose of improving the compensation effect. 【0028】傾斜型位相差フィルムと積層する偏光板としては適宜なものを用いうる。 [0028] may use a suitable one is as a polarizing plate to be laminated with the inclined retardation film. ちなみにその例としてはポリビニルアルコール系フィルムや部分ホルマール化ポリビニルアルコール系フィルム、エチレン・酢酸ビニル共重合体系部分ケン化フィルムの如き親水性高分子フィルムにヨウ素及び/又は二色性染料等の二色性物質を吸着させて延伸したもの、ポリビニルアルコールの脱水処理物やポリ塩化ビニルの脱塩酸処理物の如きポリエン配向フィルム等からなる偏光フィルムなどがあげられる。 Incidentally polyvinyl alcohol film and partially formalized polyvinyl alcohol film as an example, dichroic or iodine and / or dichroic dye such as a hydrophilic polymer film ethylene-vinyl acetate copolymer partially saponified film those drawn by adsorbing material, such as a polarizing film made of such polyene oriented film such as a dehydrated product or dehydrochlorination treatment product of polyvinyl chloride polyvinyl alcohol. 【0029】また偏光板は、偏光フィルムの片側又は両側に透明保護層を有するものであってもよい。 Further polarizing plate may have a transparent protective layer on one or both sides of the polarizing film. さらに偏光板は、反射層等を有する反射型のものなどであってもよい。 Furthermore polarizing plate may be a thing of the reflection type having a reflective layer or the like. 反射型の偏光板は、視認側(表示側)からの入射光を反射させて表示するタイプの液晶表示装置などを形成するためのものであり、バックライト等の光源の内蔵を省略できて液晶表示装置の薄型化をはかりやすいなどの利点を有する。 Reflective polarizer is for forming a liquid crystal display device of a type that displays by reflecting incident light from the viewing side (display side), liquid crystal not require built-in light source such as a backlight It has advantages such as easy to measure the thickness of the display device. 【0030】前記の透明保護層は、ポリマーの塗布層や保護フィルムの積層物などとして適宜に形成でき、その形成には透明性や機械的強度、熱安定性や水分遮蔽性等に優れるポリマーなどが好ましく用いられる。 [0030] The transparent protective layer can suitably formed as such laminate coating layer and a protective film of polymer, transparency and mechanical strength on its formation, a polymer having excellent thermal stability and moisture-shielding property and the like such as It is preferably used. その例としてはポリエステル系樹脂やアセテート系樹脂、ポリエーテルサルホン系樹脂やポリカーボネート系樹脂、ポリアミド系樹脂やポリイミド系樹脂、ポリオレフィン系樹脂やアクリル系樹脂、あるいはアクリル系やウレタン系、アクリルウレタン系やエポキシ系やシリコーン系等の熱硬化型、ないし紫外線硬化型の樹脂などがあげられる。 Polyester resins and acetate-based resin and examples thereof, polyether sulfone resin, polycarbonate resin, polyamide resin, polyimide resin, polyolefin resin or an acrylic resin, or an acrylic or urethane, Ya acrylurethane and epoxy or silicone or the like thermosetting, or ultraviolet-curable resins. 透明保護層は、微粒子の含有によりその表面が微細凹凸構造に形成されていてもよい。 Transparent protective layer, its surface by the inclusion of particulate may be formed in the fine textured structure. 【0031】また反射型偏光板の形成は、必要に応じ透明樹脂層等を介して偏光板の片面に金属等からなる反射層を付設する方式などの適宜な方式で行うことができ、 [0031] A reflection type polarizing plate may be performed in an appropriate manner, such as a method in which attached a reflective layer of metal etc. is, if required, through the transparent resin layer or the like on one surface of a polarizing plate,
例えば必要に応じマット処理した保護フィルム等の透明樹脂層の片面に、アルミニウム等の反射性金属からなる箔や蒸着膜を付設したものや、前記透明樹脂層の微粒子含有による表面微細凹凸構造の上に蒸着方式やメッキ方式等の適宜な方式で金属反射層を付設したものなどがあげられる。 On one side of the transparent resin layer such as a protective film for example obtained by matting necessary, that of attaching a foil and vapor deposition film of reflective metals such as aluminum and, on the surface fine irregular structure with fine grains containing the transparent resin layer and the like obtained by attaching a metal reflective layer by an appropriate method such as vapor deposition method or a plating scheme. 【0032】また傾斜型位相差フィルムと積層されることのある、上記したその他の位相差板、すなわち本発明による傾斜型位相差フィルム以外のものとしては、面内の屈折率をnx、ny、厚さ方向の屈折率をnzとしたとき、nx>ny=nz、nx=nz>ny、nx=ny>nz、 Further there be laminated inclined retardation film, other phase plate described above, namely as something other than the inclined retardation film according to the present invention, the in-plane refractive index nx, ny, when the refractive index in the thickness direction was as nz, nx> ny = nz, nx = nz> ny, nx = ny> nz,
nx=ny<nz、nx>ny>nz、nx>nz>ny、又はnz>nx>ny等の屈折率関係を満足するものなどの適宜なものを用いうる。 nx = ny <nz, nx> ny> nz, nx> nz> ny, or nz> nx> may use appropriate ones, such as those satisfying the refractive index relationship such ny. 【0033】ちなみに前記位相差板の例としては、上記した熱可塑性樹脂等の適宜なポリマーからなるフィルムを上記した一軸や二軸等の延伸方式又は厚さ方向配向方式等の適宜な配向処理方式の1種又は2種以上を施してなる複屈折性フィルム、ディスコティック系やネマチック系等の液晶化合物のコーティング膜を有する複屈折性フィルムなどがあげられる。 [0033] Incidentally the Examples of the retardation plate, an appropriate alignment treatment method such as stretching method or thickness direction alignment mode of uniaxial or like two axes a made of a suitable polymer film described above such as the thermoplastic resin one or more alms birefringent comprising film, such as a birefringent film having a coating film of a liquid crystal compound such as a discotic or nematic type and the like. なお遅相軸方向の屈折率をnx、進相軸方向のそれをnyとしたとき、前記のnx= Note when the refractive index in the slow axis direction nx, and it ny of fast axis direction, said nx =
ny>nzやnx=ny<nz等の特性を示すものは一軸延伸による光学楕円体などとして、またnx>ny>nz等の特性を示すものは二軸延伸フィルムなどとして得ることができる。 ny> nz as such or nx = ny <it shows the characteristics of nz such optical ellipsoid by uniaxial stretching and nx> ny> shows the characteristics such as nz can be obtained as such a biaxially stretched film. さらにnx>nz>nyやnz>nx>ny等の特性を示すものは厚さ方向配向方式等を適用して得ることができる。 Further nx> nz> ny or nz> nx> shows the characteristics such ny can be obtained by applying the thickness direction orientation method or the like. 【0034】上記した偏光板等との積層は、液晶表示装置の製造過程で順次別個に積層する方式にても行いうるが、予め積層して光学部材として用いることにより品質の安定性や積層作業性等に優れて液晶表示装置の製造効率を向上させうる利点などがある。 The lamination of the above-mentioned polarizing plate etc. may perform also by a method in which laminating is separately carried out sequentially in manufacturing process of a liquid crystal display device, stability and lamination working of the quality by using as an optical member is previously laminated there is an advantage that an excellent sex, etc. can improve manufacturing efficiency of a liquid crystal display device. なお積層には例えばアクリル系やシリコーン系、ポリエステル系やポリウレタン系、ポリエーテル系やゴム系等の透明な粘着剤などの適宜な接着剤を用いることができ、その種類について特に限定はない。 Note, for example acrylic or silicone in the multilayer, polyester-based or polyurethane, can be used an appropriate adhesive such as transparent pressure-sensitive adhesive of the polyether-based and rubber-based, etc., it is not particularly limited for its type. 傾斜型位相差フィルム等の光学特性の変化を防止する点より、硬化や乾燥の際に高温のプロセスを要しないものが好ましく、長時間の硬化処理や乾燥時問を要しないものが望ましい。 From the point of preventing the change in the optical properties of such inclined retardation film is preferably that does not require a high temperature process upon curing and drying, it is desirable which does not take a long time for curing or drying time of questions. また加熱や加湿条件下に剥離等を生じないものが好ましい。 Also those not causing peeling of the heating and humidifying conditions is preferred. 【0035】前記の点より(メタ)アクリル酸ブチルや(メタ)アクリル酸メチル、(メタ)アクリル酸エチルや(メタ)アクリル酸の如きモノマーを成分とする重量平均分子量が10万以上で、ガラス転移温度が0℃以下のアクリル系ポリマーからなるアクリル系粘着剤が特に好ましく用いうる。 [0035] The point than (meth) acrylic acid butyl and (meth) acrylate, with (meth) acrylate and (meth) weight average molecular weight of a component of such monomers acrylic acid not less than 100,000, a glass acrylic adhesive transition temperature of from 0 ℃ less acrylic polymer can be particularly preferably used. アクリル系粘着剤は、透明性や耐候性や耐熱性などに優れる点よりも好ましい。 Acrylic adhesive is preferred over the viewpoint of excellent and transparency and weather resistance and heat resistance. なお屈折率が異なるものを積層する場合には、反射損の抑制などの点より中間の屈折率を有する接着剤等が好ましく用いられる。 Note that if the refractive index is laminated different from, adhesive or the like having a refractive index of the intermediate from the viewpoint of suppressing the reflection loss is preferably used. 【0036】傾斜型位相差フィルム等への粘着層の付設は、粘着剤を塗工して乾燥処理する方式や、セパレータ上に設けた粘着層を移着する方式などの適宜な方式にて行うことができる。 The attach an adhesive layer to the inclined retardation film or the like is carried out method and a drying treatment by coating an adhesive, an adhesive layer provided on a separator using suitable methods, such as a method for transcribing be able to. そのセパレータは、そのまま接着して傾斜型位相差フィルム等を実用に供するまでの間、粘着層の汚染等を防止する保護カバーとして利用することもできる。 As separator, it until it is practically used adhesion to inclined retardation film or the like, can be used as a protective cover for preventing contamination of the adhesive layer. 粘着層は、液晶セル等の被着体への接着を目的として光学部材に設けることもできる。 The adhesive layer may be provided an adhesive to an adherend such as a liquid crystal cell into the optical member purposes. 【0037】なお粘着層等の接着層には、必要に応じて例えば天然物や合成物の樹脂類、ガラス繊維やガラスビーズ、金属粉やその他の無機粉末等からなる充填剤や顔料、着色剤や酸化防止剤などの適宜な添加剤を配合することもできる。 [0037] Note that the adhesive layer of the adhesive layer or the like, resin such as required for example natural products or synthetic, glass fibers, glass beads, fillers and pigments made of metal powder or other inorganic powder etc., colorants and an appropriate additive such as antioxidants may also be blended. また微粒子を含有させて光拡散性を示す接着層とすることもできる。 It can also be a adhesive layer contain a fine particle and shows optical diffusion nature. 【0038】傾斜型位相差フィルムと偏光板の積層に際して、それらの進相軸や透過軸等の光軸の配置角度については特に限定はなく、適宜に決定することができる。 [0038] In the laminated inclined retardation film and the polarizer is not particularly limited, the arrangement angle of the optical axis thereof, and the like fast axis or transmission axis, can be determined suitably.
ちなみにSTN型の液晶セルに適用する場合には、45 When applied to an STN type liquid crystal cell Incidentally, 45
度等の斜め交差角で配置する場合が多く、TN型の液晶セルに適用する場合には平行又は直交の交差角に配置する場合が多い。 When placing obliquely crossing angle in degrees or the like is large and is often disposed crossing angle parallel or orthogonal when applied to TN type liquid crystal cell. 【0039】上記した傾斜型位相差フィルムや偏光板、 [0039] inclined phase difference film and a polarizing plate as described above,
他の位相差板や接着層などの各素材には、例えばサリチル酸エステル系化合物やベンゾフェノン系化合物、ベンゾトリアゾール系化合物やシアノアクリレート系化合物、ニッケル錯塩系化合物等の紫外線吸収剤で処理する方式などにより紫外線吸収能をもたせることもできる。 Each material, such as other retardation plate or adhesive layer, such as salicylic acid ester-based compounds and benzophenone compounds, benzotriazole compounds, cyano acrylate type compounds, and the like method of treatment with UV absorbers and nickel complex salt type compounds it is also possible to have ultraviolet absorbing ability. 【0040】本発明による傾斜型位相差フィルム又は光学部材を用いての液晶表示装置の形成は、従来に準じて行いうる。 The formation of the liquid crystal display device using the inclined retardation film or an optical member according to the present invention may be carried out according to conventional methods. すなわち液晶表示装置は一般に、液晶セルと光学補償用の傾斜型位相差フィルム、及び必要に応じての偏光板や照明システム等の構成部品を適宜に組立てて駆動回路を組込むことなどにより形成されるが、本発明においては本発明による傾斜型位相差フィルムの1枚又は2枚以上を光学補償に用いて、それを必要に応じ偏光板や他の位相差板と共に液晶セルの少なくとも片側に設ける点を除いて特に限定はなく、従来に準じうる。 That is, a liquid crystal display is generally formed such as by incorporating a suitably assembling several drive circuit components such as polarizers, lighting system of the liquid crystal cell and the inclined retardation film for optical compensation, and optionally but in the present invention using one or two or more of the inclined retardation film according to the present invention for optical compensation, that provided at least on one side of the liquid crystal cell with it the necessary polarizing plate or other retardation plate There is no particular limitation with the exception of, any conventional methods. 【0041】従って液晶セルの片側又は両側に偏光板を配置した液晶表示装置や、照明システムにバックライトあるいはフロントライト又は/及び反射板を用いてなる透過型や反射型、あるいは反射・透過両用型などの適宜な液晶表示装置を形成することができる。 [0041] Thus the liquid crystal display device and a backlight in the illumination system or front light or / and formed by using a reflector transmissive or reflective type, or reflection-transmission combination type in which the polarizing plate is disposed on one side or both sides of the liquid crystal cell it is possible to form an appropriate liquid crystal display device, such as. 偏光板を用いた液晶表示装置の場合、光学補償用の傾斜型位相差フィルムやその他の位相差板は、液晶セルと偏光板、特に視認側の偏光板との間に配置することが補償効果の点などより好ましい。 For the liquid crystal display device using a polarizing plate, the inclined retardation film and other retardation for optical compensation liquid crystal cell and the polarizing plate, especially visual side compensation effect be placed between the polarizing plate of preferable than such a point of. その配置に際しては、上記の光学部材としたものを用いることもできる。 In the arrangement can also be used in which the above optical member. 【0042】前記において液晶表示装置の形成部品は、 The formation component of the liquid crystal display device in the above, the
積層一体化されていてもよいし、分離状態にあってもよい。 May be integrally laminated may be in the separation state. また液晶表示装置の形成に際しては、例えば拡散板やアンチグレア層、反射防止膜、保護層や保護板などの適宜な光学素子を適宜に配置することができる。 Also during the formation of the liquid crystal display device can be arranged such as diffusion plate, anti glare layer, antireflection film, a suitable optical element such as a protective layer or a protective plate as appropriate. かかる素子は、傾斜型位相差フィルムと積層してなる上記した光学部材の形態にて液晶表示装置の形成に供することもできる。 Such elements can also be subjected to formation of a liquid crystal display device in the form of an optical member described above formed by laminating the inclined retardation film. 【0043】本発明による傾斜型位相差フィルムやそれを用いた光学部材は、コントラストの向上や表示色の改善などの、液晶セルの複屈折による位相差の補償を目的にTN型やSTN型等の複屈折を示す液晶セルを用いたTFT型やMIM型等の種々の表示装置に好ましく用いうる。 [0043] The present invention optical member using inclined retardation film and it by the such improved improved and the display color contrast, TN type compensation of the phase difference due to birefringence of the liquid crystal cell on the purpose, and STN type, etc. can be preferably used in various display devices of the TFT type or MIM type, or the like using the liquid crystal cell exhibits birefringence. その場合、光学補償用の傾斜型位相差フィルムとしては液晶セルの複屈折による位相差を広い視角範囲にわたり補償するものが好ましく用いられる。 In that case, the inclined retardation film for optical compensation is preferably used to compensate over a wide viewing angle range the phase difference due to birefringence of the liquid crystal cell. 【0044】 【実施例】実施例1 溶融押出法により図3に準じてTダイを介し成形温度2 [0044] EXAMPLE 1 by melt extrusion method according to FIG. 3 through T-die molding temperature 2
80℃で厚さ150μmの透明ポリカーボネートフィルムを成形しつつ、それを直径300mmのシリコーンゴムロールの表面に厚さ2mmの金属ベルトを装着してなるゴムロールと直径300mmの金属ロールからなり、ロール間のギャップを200μmとした120℃のピンチロール間に約200℃で供給し通過冷却させて、厚さ120 While forming a transparent polycarbonate film having a thickness of 150μm at 80 ° C., it made it a metal roll having a diameter of 300mm silicone rubber surface to a thickness of 2mm rubber roll and the diameter 300mm to the metal belt formed by attachment of the roll, the gap between the rolls the so supplied through cooled at 120 ° C. to about 200 ° C. between the pinch rolls which was 200 [mu] m, thickness 120
μmの傾斜型位相差フィルムを連続して得た。 The inclined retardation film of μm obtained by consecutively. 【0045】比較例1 厚さ100μmの透明ポリカーボネートフィルムを16 [0045] The transparent polycarbonate film of Comparative Example 1 thickness 100 [mu] m 16
0℃の雰囲気下、前後に配置した周速の異なる金属ロール間を通過させて1.15倍に延伸処理し、位相差フィルムを得た。 An atmosphere of 0 ° C., then stretched to 1.15 times by passage through the different metal roll peripheral speeds arranged back and forth to obtain a retardation film. 【0046】比較例2 厚さ100μmの透明ポリカーボネートフィルムを駆動系を有して周速の異なる一対の金属ロールからなるピンチロール間に供給して剪断処理し、傾斜型位相差フィルムを得た。 [0046] supplied between pinch rolls made from different peripheral speeds pair of metal rolls having a transparent polycarbonate film drive system of Comparative Example 2 thickness 100μm sheared to give the inclined retardation film. なおロールの一方は、表面温度150℃、周速2.8m/分、他方は表面温度150℃、周速1.9 Note one of the rolls has a surface temperature of 0.99 ° C., circumferential speed 2.8 m / min, while the surface temperature of 0.99 ° C., circumferential speed 1.9
m/分の条件とした。 Was m / minute of conditions. 【0047】評価試験実施例、比較例で得た(傾斜型)位相差フィルムについて、下記の特性を調べた。 [0047] Evaluation Test Example, the (inclined) retardation film obtained in Comparative Example were examined the following characteristics. 位相差正面方向及び進相軸上に想定される法線面に対し±40 ± respect to the normal plane which is assumed in the phase difference front direction and phase advance on the axis 40
度(左右)傾斜した遅相軸方向に透過する複屈折光の位相差を調べた(オーク社製、ADR−100XY)。 Degrees (left and right) were investigated phase difference of birefringent light transmitted through the inclined slow axis direction (Oak Co., ADR-100XY). 【0048】バラツキ100mm角内における正面方向の位相差を10mm間隔で100点測定し、その最大値と最小値の差を求めた。 [0048] The retardation in the front direction in the variation 100mm square in measured 100 points in 10mm intervals to determine the difference between the maximum value and the minimum value. 【0049】傷外観を目視観察して傷の有無を調べた。 [0049] Kizugaikan was visually observed were examined the presence or absence of scratches. 【0050】前記の結果を次表に示した。 [0050] shows the results in the following table. 位 相 差(nm) 正 面 十40度 −40度 バラツキ実施例1 464 439 305 6 なし 比較例1 380 339 339 5 なし 比較例2 372 342 322 18 あり【0051】表より、実施例1では法線面を基準とした左右の斜め透過光の位相差の差が大きくて非対称性に優れると共に、正面方向の位相差のバラツキが小さく、品質も良好であることが判る。 Position phase difference than (nm) wound positive surface ten 40 ° -40 ° variation Example 1 464 439 305 6 None Comparative Example 1 380 339 339 5 None Comparative Example 2 372 342 322 18 Yes [0051] Table, Example 1 difference in phase difference between the left and right oblique transmitted light relative to the surface normal is greater excellent in asymmetry, small variations in the retardation in the front direction, it can be seen that the quality is good. これに対し比較例1では当該左右の斜め透過光に位相差の差は生じず、通常の一軸延伸物の特性を示し、比較例2では当該左右の斜め透過光の位相差の差が小さい上に、正面方向の位相差のバラツキが大きく、ロールとの接触による傷付きのあることが判る。 In contrast does not occur a difference in phase difference obliquely transmitted light in Comparative Example 1, the left and right, shows the characteristic of conventional uniaxially stretched product, on the difference in phase difference of Comparative Example 2, the right and left oblique transmitted light is small to a large variation in the phase difference in the front direction, it can be seen that a scratched due to contact with the rolls.

【図面の簡単な説明】 【図1】製造工程例の説明図【図2】位相差特性の説明斜視図【図3】光学部材例の断面図【符号の説明】 1:Tダイ3:ゴムロール32:表面の金属コート4:金属ロール5:傾斜型位相差フィルム10:光学部材7:他の位相差板9:偏光板 Illustration BRIEF DESCRIPTION OF THE DRAWINGS [Figure 1] manufacturing process Example 2 is a cross-sectional view of explaining a perspective view of the phase difference characteristic [3] The optical member Example [Description of Reference Numerals] 1: T-die 3: rubber roll 32: metal coating of the surface 4: metal roll 5: inclined retardation film 10: optical member 7: other retardation plate 9: polarizer

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl. 7識別記号 FI テーマコート゛(参考) // B29K 69:00 B29K 69:00 B29L 7:00 B29L 7:00 11:00 11:00 Fターム(参考) 2H049 BA06 BA25 BB03 BB23 BB26 BB27 BB28 BB43 BB47 BB49 BB51 BC01 BC09 BC14 BC22 2H091 FA08X FA08Z FA11X LA12 LA17 4F100 AK01A AK45 AR00B BA02 BA07 EJ37A GB41 JA20A JB16A JN01A JN10B JN30 YY00A 4F207 AA28 AG01 AG03 AH73 AJ02 AJ09 AR06 KA01 KA17 KL84 4F210 AA28 AG01 AH73 AJ02 AJ05 QA03 QC01 QD13 QG01 QG18 QM03 QM06 ────────────────────────────────────────────────── ─── of the front page continued (51) Int.Cl. 7 identification mark FI theme Court Bu (reference) // B29K 69:00 B29K 69:00 B29L 7:00 B29L 7:00 11:00 11:00 F -term ( reference) 2H049 BA06 BA25 BB03 BB23 BB26 BB27 BB28 BB43 BB47 BB49 BB51 BC01 BC09 BC14 BC22 2H091 FA08X FA08Z FA11X LA12 LA17 4F100 AK01A AK45 AR00B BA02 BA07 EJ37A GB41 JA20A JB16A JN01A JN10B JN30 YY00A 4F207 AA28 AG01 AG03 AH73 AJ02 AJ09 AR06 KA01 KA17 KL84 4F210 AA28 AG01 AH73 AJ02 AJ05 QA03 QC01 QD13 QG01 QG18 QM03 QM06

Claims (1)

  1. 【特許請求の範囲】 【請求項1】 表面を金属でコートしたゴムロールと金属ロールとの間に、熱可塑性樹脂による透光性フィルムをその融点の50%以上の温度を有する状態で供給して通過させることにより、当該フィルムにおける光軸を厚さ方向に対して傾斜させる工程を少なくとも有することを特徴とする傾斜型位相差フィルムの製造方法。 The Patent Claims 1. A surface between the rubber roll and a metal roll coated with a metal, the light-transmitting film according to the thermoplastic resin is fed in a state with 50% or higher temperature of the melting point by passing method inclined retardation film characterized by having at least a step of tilting with respect to the thickness direction of the optical axis in the film. 【請求項2】 請求項1において、透光性フィルムが溶融押出法にて連続成形されたものであり、かつその連続成形工程における成形温度の50%以上の温度を維持するものである傾斜型位相差フィルムの製造方法。 2. The method of claim 1, is intended translucent film is continuously molded by melt extrusion, and inclined is to maintain more than 50% of the temperature of the molding temperature in the continuous molding process method of manufacturing a phase difference film. 【請求項3】 請求項1又は2において、当該ロール間を通過させた透光性フィルムに対して、縦若しくは横の一軸延伸方式又は厚さ方向配向方式の少なくとも一方式を適用する配向処理工程を有する傾斜型位相差フィルムの製造方法。 3. The method of claim 1 or 2, with respect to the light-transmitting film that has passed between the rolls, vertical or lateral uniaxial stretching method or the thickness direction orientation method step alignment process of applying at least one method method for producing inclined retardation film having a. 【請求項4】 請求項1〜3に記載の製造方法による傾斜型位相差フィルムの1枚又は2枚以上と偏光板との積層体からなることを特徴とする光学部材。 4. An optical member characterized by comprising a laminate of a one or two or more and the polarizing plate of the inclined retardation film by the manufacturing method according to claims 1-3. 【請求項5】 請求項1〜3に記載の製造方法による傾斜型位相差フィルムの1枚若しくは2枚以上又はそれと偏光板を液晶セルの少なくとも片側に有することを特徴とする液晶表示装置。 5. A liquid crystal display device characterized by having one or two or more or the polarizing plate of the inclined retardation film by the manufacturing method according to claim 1 on at least one side of the liquid crystal cell. 【請求項6】 請求項5において、面内の屈折率をn 6. The method of claim 5, the refractive index in the plane n
    x、ny、厚さ方向の屈折率をnzとしたとき、下記の屈折率関係を満足する位相差板の1枚又は2枚以上を付加してなる液晶表示装置。 x, ny, and the refractive index in the thickness direction is nz, a liquid crystal display device formed by adding one or two or more retardation plate satisfying the refractive index relationship below. nx>ny=nz、nx=nz>ny、nx=ny>nz、nx= nx> ny = nz, nx = nz> ny, nx = ny> nz, nx =
    ny<nz、nx>ny>nz、nx>nz>ny、又はnz> ny <nz, nx> ny> nz, nx> nz> ny, or nz>
    nx>ny nx> ny
JP2001221267A 2001-07-23 2001-07-23 Method of manufacturing a graded phase difference film, the optical member and a liquid crystal display device Expired - Fee Related JP4798679B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001221267A JP4798679B2 (en) 2001-07-23 2001-07-23 Method of manufacturing a graded phase difference film, the optical member and a liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001221267A JP4798679B2 (en) 2001-07-23 2001-07-23 Method of manufacturing a graded phase difference film, the optical member and a liquid crystal display device

Publications (2)

Publication Number Publication Date
JP2003025414A true true JP2003025414A (en) 2003-01-29
JP4798679B2 JP4798679B2 (en) 2011-10-19

Family

ID=19054956

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001221267A Expired - Fee Related JP4798679B2 (en) 2001-07-23 2001-07-23 Method of manufacturing a graded phase difference film, the optical member and a liquid crystal display device

Country Status (1)

Country Link
JP (1) JP4798679B2 (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007001020A1 (en) * 2005-06-28 2007-01-04 Jsr Corporation Method for producing optical film, optical film and polarizing plate
WO2007123145A1 (en) * 2006-04-19 2007-11-01 Fujifilm Corporation Cellulosic resin film and process for producing the same
JP2008020670A (en) * 2006-07-13 2008-01-31 Nitto Denko Corp Liquid crystal panel and liquid crystal display
JP2008077075A (en) * 2006-08-23 2008-04-03 Jds Uniphase Corp Cartesian polarizer utilizing photo-aligned liquid crystal
EP2153972A2 (en) 2008-08-04 2010-02-17 Fujifilm Corporation Method for producing optical film, optical film, polarizer, optical compensatory film, antireflection film and liquid crystal display device
JP2010106265A (en) * 2008-10-01 2010-05-13 Fujifilm Corp Film and process for production of the same
JP2010120350A (en) * 2008-11-21 2010-06-03 Fujifilm Corp Thermoplastic film, method of manufacturing thermoplastic film, polarizing plate, optical compensation film and liquid crystal display
JP2010137422A (en) * 2008-12-10 2010-06-24 Fujifilm Corp Film, method of manufacturing film, polarizing plate, optical compensation film, antireflection film, and liquid crystal display device
JP2010139661A (en) * 2008-12-10 2010-06-24 Fujifilm Corp Method for manufacturing polarizing plate, the polarizing plate, and liquid crystal display
JP2010137396A (en) * 2008-12-10 2010-06-24 Fujifilm Corp Film, method of manufacturing the same, optical compensation film for liquid crystal display panel, polarizing plate, and liquid crystal display
JP2010160483A (en) * 2008-12-10 2010-07-22 Fujifilm Corp Film, method for manufacturing film, polarizing plate, and liquid crystal display device
WO2010106854A1 (en) * 2009-03-19 2010-09-23 コニカミノルタオプト株式会社 Optical film and method for producing optical film
JP2010234744A (en) * 2009-03-31 2010-10-21 Fujifilm Corp Film, method of manufacturing the same, polarizing plate, and liquid crystal display device
US8040468B2 (en) 2008-08-28 2011-10-18 Fujifilm Corporation Liquid crystal display device
US8351000B2 (en) 2009-09-30 2013-01-08 Fujifilm Corporation Optical film and method for producing same, polarizer, and liquid crystal display device
JP2013099858A (en) * 2011-11-07 2013-05-23 Toyo Kohan Co Ltd Method and apparatus for manufacturing film
US8654287B2 (en) 2008-09-26 2014-02-18 Fujifilm Corporation Acryl-base polymer film, optical compensation film, and liquid-crystal display device having the same
JP2014186355A (en) * 2008-08-04 2014-10-02 Fujifilm Corp Optical film, polarizing plate, optical compensating film, anti-reflection film and liquid crystal display device
KR20150015318A (en) * 2013-07-31 2015-02-10 제일모직주식회사 Optical film, method for preparing the same, polarizing plate comprising the same and liquid crystal display comprising the same
US8958034B2 (en) 2012-11-08 2015-02-17 Samsung Display Co., Ltd. Polarizing plate comprising a compensation film having a first retardation value Ro and a second retardation value Rth and liquid crystal display having the same
KR101560216B1 (en) * 2012-12-27 2015-10-14 삼성전자 주식회사 Multilayered optical film and display device
KR101577105B1 (en) * 2012-12-28 2015-12-11 제일모직주식회사 Method for preparing optical film, optical film prepared from the same and liquid crystal display comprising the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10264237A (en) * 1997-03-27 1998-10-06 Sekisui Chem Co Ltd Stock roll for manufacture of optical film, and manufacture thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10264237A (en) * 1997-03-27 1998-10-06 Sekisui Chem Co Ltd Stock roll for manufacture of optical film, and manufacture thereof

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007001020A1 (en) * 2005-06-28 2007-01-04 Jsr Corporation Method for producing optical film, optical film and polarizing plate
WO2007123145A1 (en) * 2006-04-19 2007-11-01 Fujifilm Corporation Cellulosic resin film and process for producing the same
JP2008020670A (en) * 2006-07-13 2008-01-31 Nitto Denko Corp Liquid crystal panel and liquid crystal display
JP2008077075A (en) * 2006-08-23 2008-04-03 Jds Uniphase Corp Cartesian polarizer utilizing photo-aligned liquid crystal
EP2153972A2 (en) 2008-08-04 2010-02-17 Fujifilm Corporation Method for producing optical film, optical film, polarizer, optical compensatory film, antireflection film and liquid crystal display device
JP2010058495A (en) * 2008-08-04 2010-03-18 Fujifilm Corp Optical film manufacturing method, optical film, polarizing plate, optical compensation film, antireflection film, and liquid crystal display device
JP2014186355A (en) * 2008-08-04 2014-10-02 Fujifilm Corp Optical film, polarizing plate, optical compensating film, anti-reflection film and liquid crystal display device
EP2153972A3 (en) * 2008-08-04 2010-12-01 Fujifilm Corporation Method for producing optical film, optical film, polarizer, optical compensatory film, antireflection film and liquid crystal display device
US8040468B2 (en) 2008-08-28 2011-10-18 Fujifilm Corporation Liquid crystal display device
US8654287B2 (en) 2008-09-26 2014-02-18 Fujifilm Corporation Acryl-base polymer film, optical compensation film, and liquid-crystal display device having the same
US9261732B2 (en) 2008-09-26 2016-02-16 Fujifilm Corporation Acryl-base polymer film, optical compensation film, and liquid-crystal display device having the same
US8501065B2 (en) 2008-10-01 2013-08-06 Fujifilm Corporation Film and method for producing film
JP2010106265A (en) * 2008-10-01 2010-05-13 Fujifilm Corp Film and process for production of the same
JP2010120350A (en) * 2008-11-21 2010-06-03 Fujifilm Corp Thermoplastic film, method of manufacturing thermoplastic film, polarizing plate, optical compensation film and liquid crystal display
KR101737368B1 (en) 2008-12-10 2017-05-18 후지필름 가부시키가이샤 Film and method of manufacturing the same, optical compensation film for liquid crystal display panel, polarization plate and liquid crystal display device
JP2010139661A (en) * 2008-12-10 2010-06-24 Fujifilm Corp Method for manufacturing polarizing plate, the polarizing plate, and liquid crystal display
JP2010137396A (en) * 2008-12-10 2010-06-24 Fujifilm Corp Film, method of manufacturing the same, optical compensation film for liquid crystal display panel, polarizing plate, and liquid crystal display
JP2010160483A (en) * 2008-12-10 2010-07-22 Fujifilm Corp Film, method for manufacturing film, polarizing plate, and liquid crystal display device
JP2010137422A (en) * 2008-12-10 2010-06-24 Fujifilm Corp Film, method of manufacturing film, polarizing plate, optical compensation film, antireflection film, and liquid crystal display device
WO2010106854A1 (en) * 2009-03-19 2010-09-23 コニカミノルタオプト株式会社 Optical film and method for producing optical film
JP2010234744A (en) * 2009-03-31 2010-10-21 Fujifilm Corp Film, method of manufacturing the same, polarizing plate, and liquid crystal display device
US8351000B2 (en) 2009-09-30 2013-01-08 Fujifilm Corporation Optical film and method for producing same, polarizer, and liquid crystal display device
JP2013099858A (en) * 2011-11-07 2013-05-23 Toyo Kohan Co Ltd Method and apparatus for manufacturing film
US8958034B2 (en) 2012-11-08 2015-02-17 Samsung Display Co., Ltd. Polarizing plate comprising a compensation film having a first retardation value Ro and a second retardation value Rth and liquid crystal display having the same
KR101560216B1 (en) * 2012-12-27 2015-10-14 삼성전자 주식회사 Multilayered optical film and display device
US9921348B2 (en) 2012-12-27 2018-03-20 Samsung Electronics Co., Ltd. Multilayered optical film and display device
KR101577105B1 (en) * 2012-12-28 2015-12-11 제일모직주식회사 Method for preparing optical film, optical film prepared from the same and liquid crystal display comprising the same
KR101588500B1 (en) 2013-07-31 2016-01-25 제일모직주식회사 Optical film, method for preparing the same, polarizing plate comprising the same and liquid crystal display comprising the same
KR20150015318A (en) * 2013-07-31 2015-02-10 제일모직주식회사 Optical film, method for preparing the same, polarizing plate comprising the same and liquid crystal display comprising the same

Also Published As

Publication number Publication date Type
JP4798679B2 (en) 2011-10-19 grant

Similar Documents

Publication Publication Date Title
US5699136A (en) Negative uniaxial anisotropic element and method for manufacturing the same
US20030210370A1 (en) Optical film and display system
US5245456A (en) Birefringent film with nx &gt;nz &gt;ny, process for producing the same, retardation film, elliptically polarizing plate, and liquid crystal display
US20030071947A1 (en) Optical film and a liquid crystal display using the same
US20030067574A1 (en) Laminated quarter-wave plate or circularly polarizing plate, liquid-crystal display device using the same and method for producing the same
US20030086033A1 (en) Laminated phase retarder, polarizing member and liquid-crystal display device
US20020159006A1 (en) Optical member and liquid-crystal display device
US6717642B2 (en) Wide viewing angle polarizer and liquid-crystal display device
US20030072078A1 (en) Polarizing plate and method of manufacturing the same, and liquid crystal display using the polarizing plate
JP2004157523A (en) Optical film and liquid crystal display
JP2004004641A (en) Optical film and picture display device
JP2000190385A (en) Manufacture of optical film, optical film and liquid crystal display
JP2001215332A (en) Optical retardation film and its continuous manufacturing method
JP2000227520A (en) Phase difference plate, laminated polarizing plate and liquid crystal display device
WO2010092926A1 (en) Laminate optical body, optical film, liquid crystal display device using said optical film, and method for manufacturing laminate optical body
JP2002236213A (en) Polarizing plate and liquid crystal display device which uses the same
JP2002311239A (en) Quarter-wave plate, circularly polarizing plate and display device
JP2010277028A (en) Uniaxially oriented aromatic polyester film for polarizer supporting base material
JP2002236216A (en) Optical compensation film and polarizing plate and liquid crystal display device which uses the same
JP2004226734A (en) Supporting film for polarizing film and polarizing plate
JP2005345958A (en) Liquid crystal panel, polarizing plate and liquid crystal display
US20070285599A1 (en) Liquid Crystal Display
US6476893B1 (en) Multi-layer phase retarder, elliptical polarizer and liquid crystal display device
JP2001042127A (en) Composite phase difference plate, optical compensation polarizing plate and liquid crystal display device
JP2003131036A (en) Optical film, manufacturing method thereof, and polarizing plate

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20071113

RD03 Notification of appointment of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7423

Effective date: 20090204

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20100219

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100225

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100421

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20110113

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20110405

A911 Transfer of reconsideration by examiner before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20110413

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20110728

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20110729

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140812

Year of fee payment: 3

R150 Certificate of patent (=grant) or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

LAPS Cancellation because of no payment of annual fees