JPH04194902A - Phase difference film - Google Patents
Phase difference filmInfo
- Publication number
- JPH04194902A JPH04194902A JP32744990A JP32744990A JPH04194902A JP H04194902 A JPH04194902 A JP H04194902A JP 32744990 A JP32744990 A JP 32744990A JP 32744990 A JP32744990 A JP 32744990A JP H04194902 A JPH04194902 A JP H04194902A
- Authority
- JP
- Japan
- Prior art keywords
- film
- retardation
- refractive index
- stretching
- polymer material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002861 polymer material Substances 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims description 10
- 229920000642 polymer Polymers 0.000 abstract description 13
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000004973 liquid crystal related substance Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 11
- -1 polyethylene Polymers 0.000 description 10
- 239000004793 Polystyrene Substances 0.000 description 7
- 229920002223 polystyrene Polymers 0.000 description 7
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 4
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 4
- 239000004926 polymethyl methacrylate Substances 0.000 description 4
- 239000004800 polyvinyl chloride Substances 0.000 description 4
- 229920000915 polyvinyl chloride Polymers 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229920002852 poly(2,6-dimethyl-1,4-phenylene oxide) polymer Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 2
- 210000002858 crystal cell Anatomy 0.000 description 2
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000011550 stock solution Substances 0.000 description 2
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- 229920004142 LEXAN™ Polymers 0.000 description 1
- 239000004418 Lexan Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 230000018199 S phase Effects 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000002573 ethenylidene group Chemical group [*]=C=C([H])[H] 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 229920005593 poly(benzyl methacrylate) Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920006289 polycarbonate film Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002620 polyvinyl fluoride Polymers 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Polarising Elements (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本発明は、リターデーションの視野角依存性の小さい、
液晶表示体用の新規な位相差フィルムに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a retardation system with low viewing angle dependence.
This invention relates to a novel retardation film for liquid crystal displays.
[従来の技術]
近年、ワードプロセッサーでは液晶表示体の白黒化が進
み、パーソナルコンピュータやポータプルテレビではカ
ラー液晶表示体が実用化されている。このような白黒あ
るいはカラー表示の主流として用いられているのが5T
N(スーパーツィステッド・ネマティック)方式の液晶
表示体である。[Prior Art] In recent years, the use of black and white liquid crystal displays in word processors has progressed, and color liquid crystal displays have been put into practical use in personal computers and portable televisions. 5T is the mainstream used for such black and white or color display.
It is an N (super twisted nematic) type liquid crystal display.
STN方式は、高次時分割駆動大容量化を可能にしたが
、液晶分子のねじれ角が大きいために、液晶セルに対し
電圧無印加状態での外観の色相が白ではなく緑色から黄
赤色となっている。また、選択電圧印加状態での色相が
黒色ではなく青色である。したがって、色彩的に見にく
いとともにカラー化も困難であった。現在、このような
色消しの方法として、染料による色補正、2層液晶セル
方式、複屈折性フィルムからなる位相差補償素子を用い
る方法が提案されている。中でも位相差補償素子すなわ
ち位相差フィルムを用いる方式が液晶表示体の軽量化と
コストの低減から有利であり、実用化が進んでいる。The STN method has made it possible to increase the capacity of high-order time-division driving, but because the twist angle of the liquid crystal molecules is large, the external hue of the liquid crystal cell when no voltage is applied is not white but green to yellow-red. It has become. Further, the hue when the selection voltage is applied is not black but blue. Therefore, it was difficult to see the color and it was also difficult to colorize it. Currently, as methods for such achromatization, color correction using dyes, a two-layer liquid crystal cell system, and a method using a retardation compensation element made of a birefringent film are proposed. Among them, a method using a retardation compensation element, that is, a retardation film is advantageous because it reduces the weight and cost of the liquid crystal display, and its practical use is progressing.
[発明が解決しようとする課題]
上記のSTN方式の色消しに用いられる位相差フィルム
には、液晶表示体の面に垂直な方向から見た場合だけで
なく斜めから見た場合の色消しの特性も要求される。さ
らに、この特性は斜めから見た場合の位相差フィルムの
りタープ−ジョンの角度依存性(視野角依存性)による
影響が大きい。[Problems to be Solved by the Invention] The retardation film used for the above-mentioned STN method achromatization has the ability to achromatize not only when viewed from a direction perpendicular to the surface of the liquid crystal display but also when viewed from an angle. Characteristics are also required. Furthermore, this characteristic is greatly influenced by the angle dependence (viewing angle dependence) of the tarpsion of the retardation film when viewed obliquely.
しかし、従来の位相差フィルムでは視野角依存性が大き
く、STN方式の液晶表示体を斜めから見た場合の色消
しの特性を満足するものは得られていない。これに対し
て、位相差フィルムを構成する高分子材料の分子の配向
状態を制御して視野角依存性を改善しようとする試みも
ある(特開平2−1.60204号公報)が、大面積化
と生産性に問題があると考えられる。However, conventional retardation films have a large viewing angle dependence, and no film has been obtained that satisfies the achromatic properties when viewing an STN liquid crystal display obliquely. On the other hand, some attempts have been made to improve the viewing angle dependence by controlling the orientation state of the molecules of the polymeric material that constitutes the retardation film (Japanese Patent Application Laid-open No. 2-1.60204). It is thought that there are problems with productivity and productivity.
本発明はこのような問題点を解決し、視野角依存性が小
さく、STN方式の液晶表示体に組み込んだ場合に視角
範囲を広くできる位相差フィルムを提供することを目的
とする。An object of the present invention is to solve these problems and provide a retardation film that has low viewing angle dependence and can widen the viewing angle range when incorporated into an STN liquid crystal display.
[課題を解決するための手段]
本発明者らは、上記の目的を達成するために位相差フィ
ルムを構成する高分子第1料の3次元方向の屈折率特性
とりタープ−ジョンの角度依存性の関係について鋭意検
討したところ、単独の高分子材料から形成される、一軸
方向に延伸配向したフィルムの複屈折Δniが正および
負である高分子材料を混合して作成したフィルムを、一
軸方向に延伸配向させることにより、視野角依存性に優
れた位相差フィルムが得られることを見い出し、本発明
に至ったものである。[Means for Solving the Problems] In order to achieve the above object, the present inventors have developed a three-dimensional refractive index characteristic of the first polymer material constituting the retardation film, and the angular dependence of the tarpaulin. After careful consideration of the relationship between The inventors have discovered that a retardation film with excellent viewing angle dependence can be obtained by stretching and orienting the film, leading to the present invention.
すなわち、本発明は2成分以上の高分子材料の混合物か
ら構成されるフィルムを一軸方向に延伸配向させて形成
される複屈折性を有する光学異方性フィルムであって、
該混合物の構成成分として八n、が正である高分子材料
および負である高分子材料を、該混合物の構成成分とし
てそれぞれ少なくとも1成分以上含むことを特徴とする
位相差フィルムに関する。That is, the present invention is an optically anisotropic film having birefringence formed by uniaxially stretching and orienting a film composed of a mixture of two or more polymeric materials,
The present invention relates to a retardation film characterized in that the mixture contains at least one polymeric material in which 8n is positive and one polymeric material in which 8n is negative.
本発明でいう八〇、は該混合物の構成成分であるそれぞ
れの高分子材料を単独で用いて、一軸方向に延伸配向さ
せたフィルムにおける複屈折であり、(1)式で定義さ
れる。80 in the present invention is the birefringence of a film that is uniaxially stretched and oriented using each polymeric material that is a component of the mixture, and is defined by the formula (1).
Δni=n、、−nB、 (1)(
式(1)においてn n l、n4.は該高分子材料を
単独で用いたフィルムのフィルム平面内の延伸軸方向お
よび延伸軸に垂直な方向の屈折率をそれぞれ示す。)す
なわち、Δniが正である高分子材料は延伸軸方向の屈
折率n n +が大きく、反対に八〇、が負である高分
子材料は延伸軸と垂直方向の屈折率n月が太きい。Δni=n, , -nB, (1)(
In formula (1), n n l, n4. represents the refractive index in the direction of the stretching axis in the plane of the film and in the direction perpendicular to the stretching axis of a film using the polymer material alone. ) That is, a polymer material in which Δni is positive has a large refractive index n + in the direction of the stretching axis, whereas a polymer material in which Δni is negative has a large refractive index n + in the direction perpendicular to the stretching axis. .
Δniは、高分子材料混合物から最終的に得られる位相
差フィルムの延伸倍率範囲において実質的に正または負
であればよく、Δniの大きさは限定されない。Δni may be substantially positive or negative within the stretching ratio range of the retardation film finally obtained from the polymer material mixture, and the size of Δni is not limited.
上記の高分子材料は特に限定されるものではないが、た
とえば八n1が正の高分子材料としては、ポリエチレン
、ポリプロピレン、ポリイソプレン等のポリオレフィン
系高分子、ポリ塩化ビニル、ポリフッ化ビニル、ポリフ
ッ化ビニリデン、ポリ4フツ化エチレン等の含ハロゲン
高分子、ポリ酢酸ビニル系高分子、ポリエチレンテレフ
タレート等のポリエステル系高分子、ナイロン6、ナイ
ロン6.6等のポリアミド系高分子、ポリアクリル酸エ
ステル系高分子、ポリメタクリル酸エステル系高分子、
ポリカーボネート系高分子、ポリ(2゜6ジメチル1,
4フエニレンオキサイド)等のポリエーテル系高分子お
よびこれらの変性物があげられる。一方、Δnlが負の
高分子材料としては、ポリスチレン系高分子、ポリアク
リロニトリル、トリアセチルセルロース、トリニトロセ
ルロース、ポリメチルメタクリレート、ポリα−フルオ
ロメチルメタクリレート、ポリベンジルメタクリレート
等があげられる。The above polymer materials are not particularly limited, but examples of polymer materials with positive 8n1 include polyolefin polymers such as polyethylene, polypropylene, and polyisoprene, polyvinyl chloride, polyvinyl fluoride, and polyfluorinated polymers. Halogen-containing polymers such as vinylidene and polytetrafluoroethylene, polyvinyl acetate polymers, polyester polymers such as polyethylene terephthalate, polyamide polymers such as nylon 6 and nylon 6.6, and polyacrylic acid ester polymers. molecules, polymethacrylic acid ester polymers,
Polycarbonate polymer, poly(2゜6 dimethyl 1,
Examples include polyether polymers such as 4-phenylene oxide) and modified products thereof. On the other hand, examples of polymeric materials having a negative Δnl include polystyrene polymers, polyacrylonitrile, triacetylcellulose, trinitrocellulose, polymethylmethacrylate, polyα-fluoromethylmethacrylate, polybenzylmethacrylate, and the like.
上記の高分子材料混合物から得られるフィルムの延伸方
法は、分子を一方向に配向させ、複屈折性を発現できる
方法であれば特に限定されない。The method for stretching the film obtained from the above polymer material mixture is not particularly limited as long as it can orient molecules in one direction and exhibit birefringence.
ロールおよび/またはテンターによる一軸延伸法または
二軸延伸法、インフレーション法いずれでも良いが、ロ
ールおよび/またはテンターによる一軸延伸法が特に好
ましい。Any of the uniaxial or biaxial stretching methods using rolls and/or a tenter, or the inflation method may be used, but the uniaxial stretching method using rolls and/or a tenter is particularly preferred.
本発明の位相差フィルムは3次元方向の屈折率が下記式
(2)乃至(5)の関係を満たすこ吉が好ましい。The retardation film of the present invention preferably has a refractive index in a three-dimensional direction that satisfies the relationships of formulas (2) to (5) below.
nβ<n、≦n n(2)
nβ ≦n7 <n、 (
3)口β 〉nア ≧n 、
(4)nβ ≧n7 >n、
(5)(式(2)乃至(5)においてn、、n
、はそれぞれフィルム平面内の延伸軸方向および延伸軸
に垂直な方向の屈折率を示し、n、≠口、である。n7
はフィルムの厚さ方向の屈折率を示す。)すなわち、n
7がn、またはn、のいずれか大きい値よりさらに大き
い場合、およびn6またはn、のいずれか小さい値より
さらに小さい場合はりタープ−ジョンの視野角依存性が
大きく、STN方式の液晶表示体の視角範囲を十分に広
げることができない。nβ<n, ≦n n (2) nβ ≦n7 <n, (
3) Mouth β 〉na ≧n,
(4) nβ ≧n7 >n,
(5) (In formulas (2) to (5), n, , n
, respectively, represent the refractive index in the direction of the stretching axis in the plane of the film and in the direction perpendicular to the stretching axis, and n, ≠ mouth. n7
indicates the refractive index in the thickness direction of the film. ), that is, n
If 7 is larger than the larger value of n or n, and if it is smaller than the smaller value of n6 or n, the viewing angle dependence of the tarpaulin is large and the STN liquid crystal display is The viewing angle range cannot be expanded sufficiently.
本発明の位相差フィルムの厚さの範囲は、好ましくは]
−〜500μであり、より好ましくは4〜250μであ
る。この範囲より薄い場合は皺、破断、張力むらによる
リターデーションむらの発生等、取扱い上好ましくない
。また、この範囲より厚い場合は液晶表示体の薄型化、
連続加工性等の問題が生じ、好ましくない。The thickness range of the retardation film of the present invention is preferably]
- to 500μ, more preferably 4 to 250μ. If it is thinner than this range, it is unfavorable for handling, such as wrinkles, breakage, and uneven retardation due to uneven tension. In addition, if the thickness exceeds this range, the thickness of the liquid crystal display may be reduced.
This is not preferable because it causes problems such as continuous processability.
本発明の位相差フィルムは、たとえば以−トのような方
法により製造することができるがこれに限定されるもの
ではない。The retardation film of the present invention can be produced, for example, by the following method, but is not limited thereto.
Δniが正および負の高分子オA料としてポリ(2,6
ジメチル1,4フエニレンオキサイド)およびポリスチ
レンを用いて高分子材料混合物を調製し、フィルムに製
膜するが、この方法としてたとえば以下の方法がある。Poly(2,6
A polymer material mixture is prepared using dimethyl 1,4 phenylene oxide) and polystyrene and formed into a film, for example, by the following method.
該高分子材料混合物をクロロホルム等の溶媒に該高分子
材料混合物の濃度が3〜20重量%となるように溶解し
、ガラス、ステンレス等の平滑板上に流延し、アプリケ
ータで所定の厚さにする。The polymer material mixture is dissolved in a solvent such as chloroform so that the concentration of the polymer material mixture is 3 to 20% by weight, and the mixture is cast onto a smooth plate made of glass, stainless steel, etc., and coated with an applicator to a predetermined thickness. Let's do it.
次に、20〜80°Cで溶媒が十分揮発するまで乾燥し
、さらに真空乾燥し、溶媒をほぼ完全に除去して無定形
フィルムを得る。また、該高分子+a料料金合物乾燥溶
融して押し出し、無定形フィルムを得ることもできる。Next, it is dried at 20 to 80° C. until the solvent is sufficiently volatilized, and further vacuum dried to remove the solvent almost completely to obtain an amorphous film. Alternatively, an amorphous film can be obtained by drying, melting, and extruding the polymer + a material mixture.
次にこの無定形フィルムを50〜250°Cに加熱して
1.2〜4.0倍に延伸して位相差フィルムとする。さ
らに、必要に応じて熱処理、コロナ処理、プラズマ処理
等の表面処理を行なっても良い。延伸時の加熱温度は該
高分子材料混合物の特性により異なり、一義的には言え
ないが、通常該高分子拐料混合物のガラス転移温度と融
点の間で選択することが好ましい。延伸倍率は所定のり
タープ−ジョンが得られれば任意に設定できる。このよ
うにして得られた位相差フィルムは、最後に使用上の簡
便さから粘着剤を塗布して製品とする。Next, this amorphous film is heated to 50 to 250°C and stretched 1.2 to 4.0 times to obtain a retardation film. Furthermore, surface treatments such as heat treatment, corona treatment, and plasma treatment may be performed as necessary. The heating temperature during stretching varies depending on the characteristics of the polymer material mixture and cannot be unambiguously determined, but it is usually preferably selected between the glass transition temperature and melting point of the polymer material mixture. The stretching ratio can be arbitrarily set as long as a predetermined adhesive tapering is obtained. The thus obtained retardation film is finally made into a product by applying an adhesive for ease of use.
[実施例] 以下、本発明を実施例で説明する。[Example] The present invention will be explained below with reference to Examples.
本発明におけるリターデーションは570nmにおける
値を日本光学製位相差測定装置N I) D M−1,
OOO型で測定した。また、屈折率はASTM D5
41−50に準じて、アタゴ(株)製アツベ型屈折率計
1−T型を用いて測定した。The retardation in the present invention is determined by measuring the value at 570 nm using Nippon Kogaku's phase difference measuring device N I) DM-1,
Measured using OOO type. Also, the refractive index is ASTM D5
41-50 using an Atsube refractometer model 1-T manufactured by Atago Co., Ltd.
視野角依存性はフィルム面の法線方向から測定したりタ
ープ−ジョンをR,4、法線方向から口、またはn、の
軸上を40°傾斜させた斜め方向から測定したりタープ
−ジョンをR41,1としたとき、その比R4Ll/R
oて評価した。Viewing angle dependence can be measured from the normal direction of the film surface, from the normal direction of the tarp John, or from an oblique direction tilted by 40° on the axis of the tarp John. is R41,1, the ratio R4Ll/R
It was evaluated using o.
実施例1
ポリ(2,6ジメチル1,4フエニレンオキサイド)(
アルドリッチ社製)を原料樹脂濃度が10重量%となる
ようにクロロホルムに溶解し、製膜原液を調製した。次
にこの製膜原液をガラス板上に流延し、40℃で48時
間乾燥してフィルムを作製した。次にフィルムを表1に
示す条件で一軸延伸した。ポリスチレン(旭化成■製ス
タイロン600)についても同様にフィルムを作成し、
表1に示す条件で一軸延伸した。表1に示すように、ポ
リ(2,6ジメチル1,4フエニレンオキサイド)は八
n、が正、ポリスチレンはΔniが負であった。Example 1 Poly(2,6 dimethyl 1,4 phenylene oxide) (
(manufactured by Aldrich) in chloroform to a raw resin concentration of 10% by weight to prepare a film-forming stock solution. Next, this film-forming stock solution was cast onto a glass plate and dried at 40° C. for 48 hours to produce a film. Next, the film was uniaxially stretched under the conditions shown in Table 1. A film was similarly made of polystyrene (Styron 600 manufactured by Asahi Kasei),
Uniaxial stretching was carried out under the conditions shown in Table 1. As shown in Table 1, 8n was positive for poly(2,6 dimethyl 1,4 phenylene oxide), and Δni was negative for polystyrene.
次に、ポリ(2,6ジメチル1,4フエニレンオキサイ
ド)とポリスチレンを重量比で20:80になるように
混合した原料樹脂を、同一の条件で製膜、延伸し、リタ
ーデーションが308nmの位相差フィルムを得た。表
2に示すように斜め方向から測定したりタープ−ジョン
もほとんど変化せず、良好な視野角依存性を示した。さ
らに液晶表示体に組み込んだ場合、視野角の依存性は非
常に小さくなり、40°の方向からの画面も明瞭であっ
た。Next, a raw material resin containing poly(2,6 dimethyl 1,4 phenylene oxide) and polystyrene mixed at a weight ratio of 20:80 was formed into a film and stretched under the same conditions, and a retardation of 308 nm was obtained. A retardation film was obtained. As shown in Table 2, there was almost no change in tarpaulin when measured from an oblique direction, indicating good viewing angle dependence. Furthermore, when incorporated into a liquid crystal display, the dependence on the viewing angle became extremely small, and the screen was clear even from a 40° direction.
実施例2
実施例1と同様にして、Δniが正であるポリ(2,6
ジメチル1,4フエニレンオキサイド))と負であるポ
リスチレンを重量比で40 : 60になるように混合
し、フィルムを作製した。Example 2 In the same manner as in Example 1, poly(2,6
A film was prepared by mixing dimethyl 1,4 phenylene oxide) and negative polystyrene at a weight ratio of 40:60.
次にこのフィルムを190℃で1.5倍に一軸延伸し、
リターデーションが315 n mの位相差フィルムを
得た。表2に示すように斜め方向から測定したりタープ
−ジョンもほとんど変化せず、良好な視野角依存性を示
した。Next, this film was uniaxially stretched to 1.5 times at 190°C,
A retardation film with a retardation of 315 nm was obtained. As shown in Table 2, there was almost no change in tarpaulin when measured from an oblique direction, indicating good viewing angle dependence.
実施例3
ポリ塩化ビニル(アルドリッチ社製)に10重量%のジ
オクチルフタレ−1・を添加して、熱板にてプレスして
フィルムを作成した後、一軸延伸した。また、ポリメチ
ルメタクリレート(三菱レイヨン■製)を熱板にてプレ
スしてフィルムを作成し、表1に示す条件で一軸延伸し
た。表1に示すように、ポリ塩化ビニルは八n1が正、
ポリメチルメタクリレートは負であった。Example 3 A film was prepared by adding 10% by weight of dioctyl phthalate 1. to polyvinyl chloride (manufactured by Aldrich) and pressing it on a hot plate, followed by uniaxial stretching. Further, a film was prepared by pressing polymethyl methacrylate (manufactured by Mitsubishi Rayon ■) with a hot plate, and uniaxially stretched under the conditions shown in Table 1. As shown in Table 1, polyvinyl chloride has 8n1 positive,
Polymethyl methacrylate was negative.
次に、10重量%のジオクチルフタレ−1・を添加した
ポリ塩化ビニルとポリメチルメタクリレートを重量比で
10 : 90になるように混合した原料樹脂を、熱板
にてプレスしてフィルムを作製した。Next, a raw resin prepared by mixing polyvinyl chloride with 10% by weight of dioctyl phthalate and polymethyl methacrylate at a weight ratio of 10:90 was pressed on a hot plate to produce a film. did.
次にこのフィルムを90℃で3.5倍に一軸延伸し、リ
ターデーションが321℃mの位相差フィルムを得た。Next, this film was uniaxially stretched 3.5 times at 90° C. to obtain a retardation film with a retardation of 321° C.m.
表1に示すように斜め方向から測定したりタープ−ジョ
ンもほとんど変化せず、良好な視野角依存性を示した。As shown in Table 1, when measured from an oblique direction, there was almost no change in tarpaulin, indicating good viewing angle dependence.
比較例1−
市販のポリカーボネートフィルム(ゼネラルエレクトリ
ック社製、レキサン)を170°Cで1゜5倍に一軸延
伸し、リターデーションが4200mの位相差フィルム
を得た。表1に示すようにΔn 、は正であった。表2
に示すように、斜め方向から測定したりタープ−ジョン
変化が大きく、視野角依存性は良好でない。Comparative Example 1 - A commercially available polycarbonate film (manufactured by General Electric Co., Ltd., Lexan) was uniaxially stretched by 1°5 times at 170°C to obtain a retardation film with a retardation of 4200 m. As shown in Table 1, Δn was positive. Table 2
As shown in Figure 2, when measured from an oblique direction, the tarpaulin changes are large, and the viewing angle dependence is not good.
比較例2
表1に示すように、八n1が負であるポリスチレン(脂
化成製スタイロン600)を実施例1と同様にしてフィ
ルムに製膜し、150°Cで1.5倍に一軸延伸し、リ
ターデーションが562℃mの位相差フィルムを得た。Comparative Example 2 As shown in Table 1, a polystyrene having negative 8n1 (Styron 600 manufactured by Fukasei Co., Ltd.) was formed into a film in the same manner as in Example 1, and uniaxially stretched to 1.5 times at 150°C. A retardation film having a retardation of 562° C.m was obtained.
表2に示すように斜め方向から測定したりタープ−ジョ
ン変化が大きく、視野角依存性は良好でない。As shown in Table 2, when measured from an oblique direction, the tarpaulin changes are large, and the viewing angle dependence is not good.
比較例3
表1に示すように、Δniが正のポリ(2,6ジメチル
」、4フエニレンオキサイド)(アルドリッチ社製)を
実施例3と同様にして熱板にてプレスしてフィルムに製
膜し、200℃で1.2倍に一軸延伸し、リターデーシ
ョンが1.85 n mの位相差フィルムを得た。表2
に示すように斜め方向から測定したりタープ−ジョン変
化が大きく、視野角依存性は良好でない。Comparative Example 3 As shown in Table 1, poly(2,6 dimethyl), 4-phenylene oxide (manufactured by Aldrich) having a positive Δni was pressed on a hot plate in the same manner as in Example 3 to form a film. It was filmed and uniaxially stretched to 1.2 times at 200°C to obtain a retardation film with a retardation of 1.85 nm. Table 2
As shown in the figure, when measured from an oblique direction, the tarpsion change is large, and the viewing angle dependence is not good.
以上の結果より本発明の位相差フィルムは視野角特性に
おいて優れていることがわかる。From the above results, it can be seen that the retardation film of the present invention is excellent in viewing angle characteristics.
[発明の効果]
本発明は視野角特性に優れる液晶表示装置に好適な位相
差フィルムを工業的に提供するものであり、本発明の位
相差フィルムによってワードブロセッザー、パーソナル
コンピュータ、ポータプルテレビ車載用デイスプレィ等
の視認性を向」ニさせることができる。[Effects of the Invention] The present invention industrially provides a retardation film suitable for liquid crystal display devices with excellent viewing angle characteristics, and the retardation film of the present invention can be used in word processors, personal computers, portable TVs, etc. The visibility of personal displays, etc. can be improved.
Claims (1)
ィルムを一軸方向に延伸配向させて形成される複屈折性
を有する光学異方性フィルムであって、該混合物の構成
成分としてΔn_iが正である高分子材料および負であ
る高分子材料をそれぞれ少なくとも1成分以上含むこと
を特徴とする位相差フィルム。 ただし、Δn_iは該混合物の構成成分であるそれぞれ
の高分子材料を単独で用いて、一軸方向に延伸配向させ
たフィルムにおける複屈折であり、(1)式で定義され
る。 Δn_i=n_α_i−n_β_i(1) (式1においてn_α_i、n_β_iは該高分子材料
を単独で用いたフィルムのフィルム平面内の延伸軸方向
および延伸軸に垂直な方向の屈折率をそれぞれ示す。) 2 3次元方向の屈折率が下記式(2)乃至(5)の関
係を満たすことを特徴とする請求項1記載の位相差フィ
ルム。 n_β<n_γ≦n_α(2) n_β≦n_γ<n_α(3) n_β>n_γ≧n_α(4) n_β≧n_γ>n_α(5) (式(2)乃至(5)においてn_α、n_βはそれぞ
れフィルム平面内の延伸軸方向および延伸軸に垂直な方
向の屈折率を示し、n_β≠n_αである。n_γはフ
ィルムの厚さ方向の屈折率を示す。)[Scope of Claims] An optically anisotropic film having birefringence formed by uniaxially stretching and orienting a film composed of a mixture of one or more polymeric materials, the film comprising: 1. A retardation film comprising at least one component each of a polymeric material whose Δn_i is positive and a polymeric material whose Δn_i is negative. However, Δn_i is the birefringence of a film that is uniaxially stretched and oriented using each polymeric material that is a component of the mixture, and is defined by equation (1). Δn_i=n_α_i−n_β_i (1) (In formula 1, n_α_i and n_β_i respectively represent the refractive index in the stretching axis direction and in the direction perpendicular to the stretching axis in the film plane of a film using the polymer material alone.) 2 The retardation film according to claim 1, characterized in that the refractive index in three-dimensional directions satisfies the relationships of the following formulas (2) to (5). n_β<n_γ≦n_α (2) n_β≦n_γ<n_α (3) n_β>n_γ≧n_α (4) n_β≧n_γ>n_α (5) (In formulas (2) to (5), n_α and n_β are each within the film plane It shows the refractive index in the stretching axis direction and the direction perpendicular to the stretching axis, and n_β≠n_α. n_γ shows the refractive index in the thickness direction of the film.)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32744990A JPH04194902A (en) | 1990-11-27 | 1990-11-27 | Phase difference film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32744990A JPH04194902A (en) | 1990-11-27 | 1990-11-27 | Phase difference film |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04194902A true JPH04194902A (en) | 1992-07-14 |
Family
ID=18199288
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP32744990A Pending JPH04194902A (en) | 1990-11-27 | 1990-11-27 | Phase difference film |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04194902A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002014234A (en) * | 2000-04-24 | 2002-01-18 | Teijin Ltd | Method for manufacturing optical retardation film |
US6800697B2 (en) | 2000-04-24 | 2004-10-05 | Teijin Limited | Process for producing retardation film |
JP2009244890A (en) * | 1999-12-16 | 2009-10-22 | Fujifilm Corp | Retardation plate, method of manufacturing the same, plate for circularly polarizing light using the same, half-wave plate and reflection type liquid crystal display |
JP2013190757A (en) * | 2012-03-15 | 2013-09-26 | Nippon Zeon Co Ltd | Optical film and optical film manufacturing method |
JP2014224926A (en) * | 2013-05-16 | 2014-12-04 | 東ソー株式会社 | Optical film using polymer composition |
WO2017122563A1 (en) * | 2016-01-14 | 2017-07-20 | 東ソー株式会社 | Optical compensation film and method for producing same |
JP2017129852A (en) * | 2016-01-14 | 2017-07-27 | 東ソー株式会社 | Optical compensation film and method for producing the same |
-
1990
- 1990-11-27 JP JP32744990A patent/JPH04194902A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009244890A (en) * | 1999-12-16 | 2009-10-22 | Fujifilm Corp | Retardation plate, method of manufacturing the same, plate for circularly polarizing light using the same, half-wave plate and reflection type liquid crystal display |
JP2002014234A (en) * | 2000-04-24 | 2002-01-18 | Teijin Ltd | Method for manufacturing optical retardation film |
US6800697B2 (en) | 2000-04-24 | 2004-10-05 | Teijin Limited | Process for producing retardation film |
JP4624591B2 (en) * | 2000-04-24 | 2011-02-02 | 帝人株式会社 | Method for producing retardation film |
JP2013190757A (en) * | 2012-03-15 | 2013-09-26 | Nippon Zeon Co Ltd | Optical film and optical film manufacturing method |
JP2014224926A (en) * | 2013-05-16 | 2014-12-04 | 東ソー株式会社 | Optical film using polymer composition |
WO2017122563A1 (en) * | 2016-01-14 | 2017-07-20 | 東ソー株式会社 | Optical compensation film and method for producing same |
JP2017129852A (en) * | 2016-01-14 | 2017-07-27 | 東ソー株式会社 | Optical compensation film and method for producing the same |
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