JP3474618B2 - Elliptical polarizing plate and liquid crystal display device using the same - Google Patents
Elliptical polarizing plate and liquid crystal display device using the sameInfo
- Publication number
- JP3474618B2 JP3474618B2 JP01467094A JP1467094A JP3474618B2 JP 3474618 B2 JP3474618 B2 JP 3474618B2 JP 01467094 A JP01467094 A JP 01467094A JP 1467094 A JP1467094 A JP 1467094A JP 3474618 B2 JP3474618 B2 JP 3474618B2
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- JP
- Japan
- Prior art keywords
- film
- polarizing plate
- liquid crystal
- retardation
- elliptically polarizing
- 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.)
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- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、複屈折の波長分散を容
易に制御出来る偏光板、及びそれを用いた楕円偏光板、
並びにコントラストの良好な液晶表示装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing plate which can easily control the wavelength dispersion of birefringence, and an elliptically polarizing plate using the same.
In addition, the present invention relates to a liquid crystal display device having a good contrast.
【0002】[0002]
【従来の技術】液晶表示装置は、低電圧、低消費電力で
IC回路への直結が可能であること、表示機能が多様で
あること、軽量化が可能であること等多くの特徴を有し
ており、ワードプロセッサやパーソナルコンピューター
等の表示装置として広く使用されている。その中で、液
晶分子のツイスト角が160°以上のツイステッドネマ
ティック液晶表示装置(以後STN−LCD)は従来の
ツイスト角が90°のツイステッドネマティック液晶表
示装置(TN−LCD)に比べ、大容量表示が可能であ
り、現在液晶表示装置の主流となっている。2. Description of the Related Art Liquid crystal display devices have many features such as low voltage and low power consumption, which can be directly connected to an IC circuit, various display functions, and weight reduction. It is widely used as a display device for word processors and personal computers. Among them, a twisted nematic liquid crystal display device (hereinafter STN-LCD) having a twist angle of liquid crystal molecules of 160 ° or more has a larger capacity than a conventional twisted nematic liquid crystal display device (TN-LCD) having a twist angle of 90 °. Is possible and is currently the mainstream of liquid crystal display devices.
【0003】しかしながらSTN−LCDには、表示画
像が青色あるいは黄色に着色する(ブルーモードあるい
はイエローモード)という問題があり、このため白黒表
示ではコントラスト、視認性が低く、またカラー化が極
めて困難であった。そこでこの着色を補償するために、
逆ねじりのSTN液晶セルを用いる二層液晶方式の白
黒、あるいは、カラー表示が提案されたが、複数の液晶
セルを用いるため、表示装置の重量、容積が大きくな
る、あるいはコストが高くなる等の問題点、また視角の
僅かな変化でコントラストが急激に低下する、あるいは
背景色が変化する等の、視角特性の劣化という別の問題
があった。However, the STN-LCD has a problem that the displayed image is colored in blue or yellow (blue mode or yellow mode). For this reason, the contrast and visibility are low in black and white display, and colorization is extremely difficult. there were. So to compensate for this coloring,
A two-layer liquid crystal black-and-white or color display using a reverse twisted STN liquid crystal cell has been proposed. However, since a plurality of liquid crystal cells are used, the weight and volume of the display device increase, or the cost increases. There is another problem that the viewing angle characteristic is deteriorated such that the contrast sharply decreases with a slight change in the viewing angle or the background color changes.
【0004】この問題を解決するために、特開昭63−
167303号、同63−167304号、同63−1
89804号、同63−261302号、同63−14
9624号、特開平1−201607号、同1−201
608号、同1−105217号、特開平2−2853
03号、同2−59702号、同2−24406号、同
2−146002号、同2−257103号、特開平3
−23404号、同3−126012号、同3−181
905号、同3−194503号公報等に記載されてい
る様に、逆ねじりのSTN液晶のかわりに位相差板を用
いる方法が提案された。In order to solve this problem, Japanese Patent Laid-Open No. 63-
No. 167303, No. 63-167304, No. 63-1
89804, 63-261302, 63-14.
9624, JP-A-1-201607 and 1-201.
608, 1-105217, JP-A-2-2853.
No. 03, No. 2-59702, No. 2-24406, No. 2-146002, No. 2-257103, JP-A-3.
-23404, 3-126012, 3-181.
As described in Japanese Patent Publication No. 905, No. 3-194503, etc., a method of using a retardation plate instead of the reverse twist STN liquid crystal has been proposed.
【0005】これらの方法によれば、STN−LCDの
着色が大幅に改善され、表示装置自身の重量、容積も著
しく小さくなり、コストも安くなるが、STN−LCD
の視角特性についてはほとんど改良されなかった。According to these methods, the coloring of the STN-LCD is significantly improved, the weight and volume of the display device itself is significantly reduced, and the cost is reduced, but the STN-LCD is reduced.
The viewing angle characteristics of were hardly improved.
【0006】そこで、この視角特性を改良するために、
特開平2−285303号、特開平2−160204号
公報、EP−0482620A2、特開平5−1579
11号公報の方法が提案された。Therefore, in order to improve this viewing angle characteristic,
JP-A-2-285303, JP-A-2-160204, EP-0482620A2, JP-A5-1579
The method of Japanese Patent No. 11 has been proposed.
【0007】さらに特開平2−256023号、特開平
3−141303号、同3−14122号、同3−24
502号公報に、固有複屈折値が正と負のフィルムを各
々1枚づつ、あるいは積層したものを位相差板として用
いる方法が提案された。これらの方法により、視角によ
るコントラストの変化が小さくなり、視角特性が改良さ
れたFurther, JP-A-2-256023, JP-A-3-141303, JP-A-3-14122, and JP-A-3-24.
In Japanese Patent No. 502, there has been proposed a method in which one film each having positive and negative intrinsic birefringence values or a laminated film is used as a retardation plate. By these methods, the change of the contrast depending on the viewing angle was reduced, and the viewing angle characteristics were improved.
【0008】これらの方法は、従来のLCDの視角特性
を大幅に改良することができるが、高速応答性のLCD
に対しては、正面の色味、コントラストを改良すること
が出来なかった。この高速応答性のLCDを正面から見
た場合の色味を補償し、コントラストを上げる方法とし
ては、特開平4−365002号公報、特願平4−28
1871号明細書に記載されているように高波長分散タ
イプのポリマ−フィルム、具体的にはポリスルフォン系
重合体を用いることが知られている。しかしながら、特
開平5−150116号公報にも記載があるように該ポ
リスルフォン系重合体フィルムはTgが高いため、加熱
変形を行う製造方法を新たに開発するには、コストと時
間がかかり、難しい。また、特開平2−120804
号、及び同5−27119号公報に、複屈折フィルムの
積層体により波長分散をコントロ−ルした位相差板の記
載があるが、同方法によると、偏光板の他に2枚の複屈
折フィルムが必要であり、コスト高となる。更に、特開
平5−27119号公報の実施例にあるように、高波長
分散の位相差板を得るためには、高レタ−デ−ション値
の複屈折フィルムを必要とし、フィルム面内のレタ−デ
−ション値の均一性、あるいは延伸時のシワ等、製造
上、困難を伴う。Although these methods can greatly improve the viewing angle characteristics of conventional LCDs, they have a fast response LCD.
However, the front color and contrast could not be improved. As a method of compensating for the tint when this high-speed response LCD is viewed from the front and increasing the contrast, there is a method disclosed in JP-A-4-365002, Japanese Patent Application No. 4-28.
It is known to use a high wavelength dispersion type polymer film, specifically a polysulfone-based polymer, as described in Japanese Patent No. 1871. However, as described in JP-A-5-150116, since the polysulfone-based polymer film has a high Tg, it is costly, time-consuming, and difficult to newly develop a manufacturing method for performing heat deformation. . In addition, JP-A-2-120804
And JP-A-5-27119 describe a retardation plate in which wavelength dispersion is controlled by a laminate of birefringent films. According to the method, two birefringent films other than a polarizing plate are described. Is required, and the cost is high. Further, as in the example of JP-A-5-27119, in order to obtain a retardation plate having a high wavelength dispersion, a birefringent film having a high retardation value is required, and a retardation film in the film plane is required. -Difficulty in production, such as uniformity of section value or wrinkles during stretching.
【0009】[0009]
【発明が解決しようとする課題】本発明の目的は、高速
応答性のSTN−LCDの着色、およびコントラストを
容易に改善しうる楕円偏光板を大量に、安価に提供する
事である。また他の目的は、この楕円偏光板を用いて背
景の着色、およびコントラストの改良された液晶表示装
置を提供する事である。SUMMARY OF THE INVENTION An object of the present invention is to provide a large amount of elliptically polarizing plates which can easily improve the coloring and contrast of STN-LCD having a high-speed response at a low cost. Another object of the present invention is to provide a liquid crystal display device in which the background is colored and the contrast is improved by using the elliptically polarizing plate.
【0010】[0010]
【課題を解決するための手段】上記課題は、(1)偏光
板と位相差フィルムとを積層した楕円偏光板において、
前記偏光板の少なくとも一方の保護フィルムが、波長5
90nmの光で測定したレターデーション値が30nm
乃至60nmの範囲であるトリアセチルセルロースから
成るプラスチックフィルムであり、前記位相差フイルム
の波長分散値が1.00以上であることを特徴とする楕
円偏光板;(2)前記位相差フィルムが、一軸延伸フィ
ルムである(1)に記載の楕円偏光板;一軸延伸フィル
ムがポリカーボネート系高分子からなるフィルムである
(1)に記載の楕円偏光板;(3)前記プラスチックフ
ィルムが、延伸されたトリアセチルセルロースフィルム
である(1)に記載の楕円偏光板;および(1)乃至
(3)のいずれか一つに記載の楕円偏光板を液晶セルの
少なくとも片側に配置してなることを特徴とする液晶表
示装置により達成された。Means for Solving the Problems The above-mentioned problems are (1) an elliptically polarizing plate in which a polarizing plate and a retardation film are laminated,
At least one protective film of the polarizing plate has a wavelength of 5
Retardation value measured with 90 nm light is 30 nm
An elliptically polarizing plate characterized by having a wavelength dispersion value of the retardation film of 1.00 or more, which is a plastic film made of triacetyl cellulose having a range of from 60 nm to 60 nm ; (2) the retardation film being uniaxial The elliptically polarizing plate according to (1), which is a stretched film; the elliptically polarizing plate according to (1), in which the uniaxially stretched film is a film made of a polycarbonate-based polymer; (3) the plastic film is stretched triacetyl A liquid crystal comprising a elliptically polarizing plate according to (1), which is a cellulose film; and the elliptically polarizing plate according to any one of (1) to (3), which is disposed on at least one side of a liquid crystal cell. Achieved by the display device.
【0011】すなわち、高速応答性LCDには、複屈折
の波長分散の大きな位相差板が最適であるが、これは、
複屈折の波長分散の異なる複屈折フィルムを積層するこ
とにより、得ることができる。この積層タイプについて
は、特開平2−120804、同2−285304、同
5−27118、同5−27119、同5−45520
号公報に、ポリビニルアルコ−ルとポリカ−ボネ−ト、
ポリビニルアルコ−ルとポリメチルメタクリレ−ト、ポ
リプロピレンとポリカ−ボネ−ト等の積層により、波長
分散をコントロ−ルした記載がある。しかし、これらを
後述する偏光子と組み合わせて、楕円偏光板とした場合
は、これら2枚のフィルムの熱収縮率の違いや、湿度に
よる偏光子の偏光能の劣化等、偏光子に直接位相差板を
積層して楕円偏光板とするためには、新たに技術開発す
べき問題が山積みであり、現在のところ、偏光子にトリ
アセチルセルロ−ス(TAC)から成る保護フィルムを
貼り付けて偏光板とし、その上に位相差板を積層して楕
円偏光板とする以外に、耐久性に優れた楕円偏光板を作
成する方法はない。偏光子の両側に保護フィルムである
TACを貼り合わせた三層構成の偏光板に、複屈折の波
長分散の異なる複屈折フィルムを積層した二層構成の位
相差板を組み合わせた場合、楕円偏光板としては、少な
くとも五層構成以上になり、これらをアワ、異物、キズ
等の欠陥なく五層以上も積層することは難しく、コスト
も高くなる。That is, a retardation plate having a large wavelength dispersion of birefringence is most suitable for a fast response LCD.
It can be obtained by laminating birefringent films having different wavelength dispersion of birefringence. Regarding this laminated type, Japanese Patent Laid-Open Nos. 2-120804, 2-285304, 5-27118, 5-27119, and 5-45520 are available.
Japanese Patent Laid-Open Publication No. 1994-242242, polyvinyl alcohol and polycarbonate,
There is a description that wavelength dispersion is controlled by stacking polyvinyl alcohol and polymethyl methacrylate, polypropylene and polycarbonate and the like. However, when these are combined with a polarizer described below to form an elliptically polarizing plate, there is a direct phase difference to the polarizer due to a difference in thermal shrinkage between these two films, deterioration of polarizing ability of the polarizer due to humidity, and the like. There are many new problems to be developed in order to laminate plates into an elliptical polarizing plate, and at present, a protective film made of triacetyl cellulose (TAC) is attached to a polarizer for polarization. There is no method for producing an elliptically polarizing plate excellent in durability other than a plate and laminating a retardation plate on it to form an elliptically polarizing plate. When a polarizing plate having a three-layer structure in which TAC as a protective film is attached to both sides of a polarizer is combined with a retardation plate having a two-layer structure in which birefringent films having different wavelength dispersions of birefringence are laminated, As a result, at least five layers or more are formed, and it is difficult to stack five or more layers without defects such as bubbles, foreign matters, and scratches, and the cost becomes high.
【0012】該TACフィルムを延伸したところ、下記
の式で表される波長分散特性は1.00以下となり、現
在、位相差フィルムとして公知のポリカ−ボネ−ト、ポ
リスチレン等の波長分散値が1.00以上のフィルムと
積層するだけで、所望の高波長分散特性を容易に得るこ
とができた。When the TAC film is stretched, the wavelength dispersion characteristic represented by the following formula becomes 1.00 or less, and the wavelength dispersion value of polycarbonate, polystyrene, etc., which is currently known as a retardation film, is 1 or less. The desired high wavelength dispersion characteristics could be easily obtained simply by laminating the film with a film of 0.000 or more.
【0013】
波長分散特性 : Re(450)/Re(590)
Re(450):450nmの光で測定したレターデー
ション値
Re(590):590nmの光で測定したレターデー
ション値Chromatic dispersion characteristics: Re (450) / Re (590) Re (450): Retardation value measured with 450 nm light Re (590): Retardation value measured with 590 nm light
【0014】このように、本発明のTACよりなるフィ
ルムは、低レターデーションを有していることに特徴が
あり、一軸延伸することによって得られる。そしてTA
Cフィルムは590nmの光に対するレターデーション
値として30nm以上あれば、公知のポリカーボネート
系位相差フィルムと積層することによりポリスルフォン
系高分子フィルムと同等の波長分散特性が得られる。前
述公知の実施例と同様にTACの延伸倍率が大きくなる
と、フィルム面内のレターデーション値の均一性が失わ
れたり、あるいはシワによる面状の悪化が起こるのでレ
ターデーション値の上限を60nm以下にする。さらに
50nm以下にすることが好ましい。本発明のトリアセ
チルセルロースよりなるフィルムは、トリアセチルセル
ロース単体のフィルムであっても良いし、可塑剤等の添
加剤、または他のポリマーとのブレンド物であっても良
い。本発明の楕円偏光板に用いる一軸延伸フィルムのポ
リマーとしては、正、または負の固有複屈折を有するポ
リマーが好ましく、正の固有複屈折を有するポリマーの
具体例としては、ポリカーボネート、ポリアリレート、
ポリエチレンテレフタレート、ポリアミド、ポリイミ
ド、ポリサルフォン、ポリエーテルサルフォン等が好ま
しい。また、負の固有複屈折を有するポリマーの具体例
としては、ポリスチレン、ポリスチレン共重合体、ポリ
メチルメタクリレート、等が好ましい。固有複屈折が大
きく、溶液製膜により面状の均一なフィルムを作りやす
い高分子が好ましい。又、上記ポリマーは、単にホモポ
リマーだけでなく、コポリマー、それらの誘導体、ブレ
ンド物等であってもよい。As described above, the TAC film of the present invention is characterized by having a low retardation, and can be obtained by uniaxial stretching. And TA
If the C film has a retardation value of 30 nm or more with respect to light of 590 nm, the wavelength dispersion characteristic equivalent to that of the polysulfone polymer film can be obtained by laminating it with a known polycarbonate retardation film. When the stretching ratio of TAC is increased as in the above-mentioned known examples, the uniformity of the retardation value in the film plane is lost, or the surface state is deteriorated due to wrinkles. Therefore, the upper limit of the retardation value is set to 60 nm or less. To do . Further, it is preferable that the thickness is 50 nm or less. The film made of triacetyl cellulose of the present invention may be a film of triacetyl cellulose alone, or may be an additive such as a plasticizer or a blend with another polymer. The polymer of the uniaxially stretched film used for the elliptically polarizing plate of the present invention is preferably a polymer having positive or negative intrinsic birefringence, and specific examples of the polymer having positive intrinsic birefringence include polycarbonate, polyarylate,
Polyethylene terephthalate, polyamide, polyimide, polysulfone, polyether sulfone and the like are preferable. As specific examples of the polymer having negative intrinsic birefringence, polystyrene, polystyrene copolymer, polymethylmethacrylate, etc. are preferable. A polymer having a large intrinsic birefringence and capable of easily forming a planar and uniform film by solution casting is preferable. Further, the above-mentioned polymer may be not only a homopolymer but also a copolymer, a derivative thereof, a blended product and the like.
【0015】本発明に用いられる偏光子は、特に限定は
ないが、一般には、ポリビニルアルコ−ルの如き親水性
高分子からなるフィルムを、ヨウ素の如き二色性染料で
処理して延伸したものや、塩化ビニルの如きプラスチッ
クフィルムを処理してポリエンを配向させたものからな
ることが好ましい。本発明の楕円偏光板は、図1に示す
ように、上述した偏光板と一軸延伸フィルムすなわち位
相差フィルムとを積層したものである。この位相差フィ
ルムは、種々の光軸が適宜な角度となるように配置して
も良い。これらフィルムの積層は、アクリル系、SBR
系、シリコンゴム系等の透明な接着剤、ないし粘着剤を
用いて行うことが出来る。その接着剤等の種類について
は特に限定はない。構成部材の光学特性の変化防止の点
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間を要しないも
のが好ましい。この方法により、トリアセチルセルロ−
スよりなるフィルムに若干のレタ−デ−ションを付与す
るだけで、現状の楕円偏光板と同じ構成で、高速応答性
のLCDの着色、コントラストの補償が可能になる。The polarizer used in the present invention is not particularly limited, but generally, a film made of a hydrophilic polymer such as polyvinyl alcohol is treated with a dichroic dye such as iodine and stretched. Alternatively, it is preferably made by treating a plastic film such as vinyl chloride to orient the polyene. As shown in FIG. 1, the elliptically polarizing plate of the present invention is a laminate of the above-mentioned polarizing plate and a uniaxially stretched film, that is, a retardation film. The retardation film may be arranged so that various optical axes have appropriate angles. The lamination of these films is acrylic, SBR
It can be carried out using a transparent adhesive or pressure-sensitive adhesive such as a silicone-based or silicone rubber-based adhesive. The type of the adhesive or the like is not particularly limited. From the viewpoint of preventing changes in the optical properties of the constituent members, those that do not require a high temperature process at the time of curing or drying are preferred, and those that do not require a long curing treatment or drying time are preferred. By this method, triacetyl cellulose
By imparting a slight amount of retardation to the film made of glass, it becomes possible to color the high-speed responsive LCD and compensate for the contrast with the same configuration as the current elliptically polarizing plate.
【0016】本発明の液晶表示装置は、液晶セルの片側
または両側に、上記した楕円偏光板を設けたものであ
る。以下、実施例によって発明を詳細に説明する。The liquid crystal display device of the present invention comprises the above-mentioned elliptically polarizing plate provided on one side or both sides of the liquid crystal cell. Hereinafter, the invention will be described in detail with reference to Examples.
【0017】[0017]
【実施例】トリアセチルセルロ−スフィルム(HF−1)の作製
トリアセチルセルロ−スをメチレンクロライド/メタノ
−ル(=92/8wt%比)に、13wt%の濃度で溶
解し、可塑剤TPP/BDP=2/1(ここでTPP;
トリフェニルフォスフェ−ト、BDP;ビフェニルジフ
ェニルフォスフェ−ト)を、該トリアセチルセルロ−ス
に対して15wt%加えて、溶液流延法にてトリアセチ
ルセルロ−スフィルム(HF−0)を作製した。このフ
ィルムのレタ−デ−ション値は5nmであった。HF−
0を、140℃で30%延伸することにより、レタ−デ
−ション値(590nmの光で測定)が30nmのトリ
アセチルセルロ−スフィルム(HF−1)を作製したExample Preparation of triacetyl cellulose film (HF-1) Triacetyl cellulose was dissolved in methylene chloride / methanol (= 92/8 wt% ratio) at a concentration of 13 wt% to prepare a plasticizer TPP. / BDP = 2/1 (where TPP;
Triphenylphosphate, BDP; biphenyldiphenylphosphate) was added to the triacetylcellulose in an amount of 15% by weight, and a triacetylcellulose film (HF-0) was obtained by a solution casting method. It was made. The retardation value of this film was 5 nm. HF-
0 was stretched by 30% at 140 ° C. to prepare a triacetylcellulose film (HF-1) having a retardation value (measured with light of 590 nm) of 30 nm.
【0018】位相差フィルム(CO−1)の作製
重量平均分子量8万のポリカ−ボネ−トの17%メチレ
ンクロライド溶液をステンレスバンド上に流延し、残留
揮発分が3%になった後、該フィルムを158℃の温度
条件で、15%縦一軸延伸することによりレタ−デ−シ
ョン値(590nmの光で測定)が410nmのポリカ
−ボネ−ト複屈折フィルム(CO−1)を得た。位相差フィルム(CO−2)の作製
重量平均分子量8万のポリカ−ボネ−トの17%メチレ
ンクロライド溶液をステンレスバンド上に流延し、残留
揮発分が3%になった後、該フィルムを158℃の温度
条件で、30%縦一軸延伸することによりレタ−デ−シ
ョン値(590nmの光で測定)が1300nmのポリ
カ−ボネ−ト複屈折フィルム(CO−2)を得た。 Preparation of Retardation Film (CO-1) A 17% methylene chloride solution of polycarbonate having a weight average molecular weight of 80,000 was cast on a stainless steel band to give a residual volatile content of 3%. The film was longitudinally uniaxially stretched by 15% at a temperature of 158 ° C. to obtain a polycarbonate birefringent film (CO-1) having a retardation value (measured with light of 590 nm) of 410 nm. . Preparation of Retardation Film (CO-2) A 17% methylene chloride solution of polycarbonate having a weight average molecular weight of 80,000 was cast on a stainless steel band, and the residual volatile content became 3%. Polycarbonate birefringent film (CO-2) having a retardation value (measured with light of 590 nm) of 1300 nm was obtained by longitudinal 30% uniaxial stretching under the temperature condition of 158 ° C.
【0019】ポリプロピレンフィルム(PO−1)の作
製
厚さ100μmのポリプロピレンフィルムを140℃で
90%縦一軸延伸することによりレタ−デ−ション値
(590nmの光で測定)が900nmのポリプロピレ
ン複屈折フィルム(PO−1)を得た。 Production of polypropylene film (PO-1)
A polypropylene birefringent film (PO-1) having a retardation value (measured with light of 590 nm) of 900 nm was obtained by longitudinally uniaxially stretching a polypropylene film having a thickness of 100 μm by 90% at 140 ° C.
【0020】楕円偏光板、1、2、3の作成、及び耐湿
熱評価
上記実施例にて作製したフィルムを用いて、図2に示す
構成で、かつ表1のA及びBの組み合わせで楕円偏光板
−1、2、3を作製し、80℃/dry、60℃/90
%の温湿度条件で、500時間の耐久テストを行った。
その結果を表1に示す。Preparation of elliptical polarizing plates 1, 2, 3 and moisture resistance
Thermal Evaluation Using the films produced in the above examples, elliptical polarizing plates-1, 2, and 3 were produced with the configuration shown in FIG. 2 and with the combination of A and B in Table 1, and 80 ° C./dry, 60 ℃ / 90
A durability test was performed for 500 hours under a temperature and humidity condition of%.
The results are shown in Table 1.
【0021】[0021]
【表1】 [Table 1]
【0022】液晶パネルによる評価
高速応答性の液晶ディスプレイを分解し、STN液晶セ
ルの偏光板、及び位相差フィルムの代わりに、上記楕円
偏光板−1、2、3を組み込んで液晶パネルを作製し
た。得られた液晶パネルのコントラスト(数値の高い程
よい)、着色の有無の評価結果を表2に示す。 Evaluation by liquid crystal panel A liquid crystal display having a high-speed response was disassembled, and the elliptical polarizing plates-1, 2 and 3 were incorporated instead of the polarizing plate of the STN liquid crystal cell and the retardation film to prepare a liquid crystal panel. . Table 2 shows the evaluation results of the contrast (the higher the numerical value, the better) and the presence or absence of coloring of the obtained liquid crystal panel.
【0023】[0023]
【表2】 [Table 2]
【0024】この結果からわかるように、本発明により
非常に安価に、また従来の構成を大きく変えることな
く、高速応答性のLCDのコントラストの向上や着色を
低減して表示品位を上げることができる。As can be seen from these results, the present invention makes it possible to improve the display quality by improving the contrast and reducing the coloring of a fast-response LCD at a very low cost and without significantly changing the conventional structure. .
【図1】楕円偏光板の構成の例を示した説明図である。FIG. 1 is an explanatory diagram showing an example of the configuration of an elliptically polarizing plate.
【図2】実施例の楕円偏光板の組み合わせを説明する図
である。FIG. 2 is a diagram illustrating a combination of elliptically polarizing plates of Examples.
Claims (5)
円偏光板において、前記偏光板の少なくとも一方の保護
フィルムが、波長590nmの光で測定したレターデー
ション値が30nm乃至60nmの範囲であるトリアセ
チルセルロースから成るプラスチックフィルムであり、
前記位相差フイルムの波長分散値が1.00以上である
ことを特徴とする楕円偏光板。1. An elliptically polarizing plate in which a polarizing plate and a retardation film are laminated, and at least one protective film of the polarizing plate has a retardation value measured with light having a wavelength of 590 nm in a range of 30 nm to 60 nm. A plastic film made of acetyl cellulose,
An elliptically polarizing plate, wherein the retardation film has a wavelength dispersion value of 1.00 or more.
ムであることを特徴とする請求項1に記載の楕円偏光
板。2. The elliptically polarizing plate according to claim 1, wherein the retardation film is a uniaxially stretched film.
高分子からなるフィルムであることを特徴とする請求項
2に記載の楕円偏光板。3. The elliptically polarizing plate according to claim 2, wherein the uniaxially stretched film is a film made of a polycarbonate polymer.
たトリアセチルセルロースフィルムであることを特徴と
する請求項1に記載の楕円偏光板。4. The elliptically polarizing plate according to claim 1, wherein the plastic film is a stretched triacetyl cellulose film.
楕円偏光板を液晶セルの少なくとも片側に配置してなる
ことを特徴とする液晶表示装置。5. A liquid crystal display device comprising the elliptically polarizing plate according to claim 1 arranged on at least one side of a liquid crystal cell.
Priority Applications (1)
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JP01467094A JP3474618B2 (en) | 1994-02-08 | 1994-02-08 | Elliptical polarizing plate and liquid crystal display device using the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP01467094A JP3474618B2 (en) | 1994-02-08 | 1994-02-08 | Elliptical polarizing plate and liquid crystal display device using the same |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07218724A JPH07218724A (en) | 1995-08-18 |
JP3474618B2 true JP3474618B2 (en) | 2003-12-08 |
Family
ID=11867658
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JP01467094A Expired - Fee Related JP3474618B2 (en) | 1994-02-08 | 1994-02-08 | Elliptical polarizing plate and liquid crystal display device using the same |
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JP (1) | JP3474618B2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100655677B1 (en) * | 1999-03-12 | 2006-12-08 | 후지 샤신 필름 가부시기가이샤 | Elliptic polarizer formed of transparent protective layer, polarizer layer, transparent support and optical anisotropic layer of liquid-crystal molecules |
AU3841800A (en) | 1999-04-21 | 2000-11-10 | Fuji Photo Film Co., Ltd. | Phase contrast plate comprising one sheet of cellulose ester film containing aromatic compound |
TW200806451A (en) | 1999-10-21 | 2008-02-01 | Konica Minolta Opto Inc | Optical film, its manufacturing method and liquid crystal display device using it |
JP2003240955A (en) * | 2002-02-21 | 2003-08-27 | Konica Corp | Optical film, polarizing plate, optical film roll, display device using optical film and method for manufacturing optical film |
KR101152548B1 (en) * | 2005-06-30 | 2012-06-01 | 엘지디스플레이 주식회사 | Liquid crystal display device increasing viewing angle |
RU2457523C2 (en) | 2008-05-14 | 2012-07-27 | Шарп Кабусики Кайся | Liquid crystal display device |
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1994
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