JP2001264538A - Optical compensation plate, optical member and liquid crystal display device - Google Patents
Optical compensation plate, optical member and liquid crystal display deviceInfo
- Publication number
- JP2001264538A JP2001264538A JP2000079516A JP2000079516A JP2001264538A JP 2001264538 A JP2001264538 A JP 2001264538A JP 2000079516 A JP2000079516 A JP 2000079516A JP 2000079516 A JP2000079516 A JP 2000079516A JP 2001264538 A JP2001264538 A JP 2001264538A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- optical
- phase difference
- optical member
- display device
- 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)
Abstract
Description
【０００１】[0001]
【発明の技術分野】本発明は、液晶表示装置の視角特性
の改善などに好適な位相差特性の安定性に優れる光学補
償板及び光学部材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical compensator and an optical member having excellent stability of retardation characteristics suitable for improving a viewing angle characteristic of a liquid crystal display device.
【０００２】[0002]
【従来の技術】従来、液晶セルの複屈折による位相差を
正面や斜視の広い角度で補償して広い視角範囲で表示品
位に優れる液晶表示装置を形成することを目的に、その
偏光板や液晶セルに位相差フィルムからなる光学補償板
を粘着層を介して接着積層したものが知られていた。し
かしながら光学補償板の付加で表示ムラが発生しやすく
なる問題点があった。2. Description of the Related Art Conventionally, a polarizing plate or a liquid crystal has been used to form a liquid crystal display device having excellent display quality in a wide viewing angle range by compensating for a phase difference due to birefringence of a liquid crystal cell at a wide angle in front and perspective. It has been known that an optical compensator made of a retardation film is adhered and laminated on a cell via an adhesive layer. However, there is a problem that display unevenness is likely to occur due to the addition of the optical compensator.
【０００３】[0003]
【発明の技術課題】本発明者らは、前記した光学補償板
の付加による表示ムラの発生問題を克服するために鋭意
研究を重ねる中で、その表示ムラの発生問題が光学補償
板の接着積層時やその後の加熱・加湿処理あるいは実用
時の熱や湿度の作用などで位相差フィルムに歪みが生
じ、その歪みによる複屈折で位相差特性が変化してコン
トラストや色特性等のバラツキが発生し表示ムラを生じ
させることを究明した。従って本発明は、液晶表示装置
等に適用した場合に位相差特性が変化しにくい光学補償
板ないし光学部材の開発を目的とする。The inventors of the present invention have intensively studied to overcome the problem of display unevenness caused by the addition of the optical compensator described above. Distortion occurs in the retardation film due to heat or humidification treatment at the time of or after, or the action of heat or humidity in practical use, and the birefringence due to the distortion changes the retardation characteristics, causing variations in contrast and color characteristics. It has been found that display unevenness is caused. Accordingly, an object of the present invention is to develop an optical compensator or an optical member whose phase difference characteristic is hard to change when applied to a liquid crystal display device or the like.
【０００４】[0004]
【課題の解決手段】本発明は、位相差フィルムに粘着層
を設けてなり、又は位相差フィルムを粘着層を介し被着
体に接着積層してなり、前記位相差フィルムの光弾性係
数（ｍ２／Ｎ）と前記粘着層の弾性率（Ｎ／ｍ２）との
積（Ｙ）がＹ≦１．２×１０−５を満足することを特徴
とする光学補償板又は光学部材、及びその光学部材を有
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。According to the present invention, a retardation film is provided with an adhesive layer, or a retardation film is adhered and laminated on an adherend via an adhesive layer, and the photoelastic coefficient (m 2 / N) and the product (Y) of the elastic modulus (N / m 2 ) of the pressure-sensitive adhesive layer satisfies Y ≦ 1.2 × 10 −5 , and an optical compensator or an optical member thereof. A liquid crystal display device having an optical member is provided.
【０００５】[0005]
【発明の効果】本発明によれば、前記のＹ式を満足する
ことで光学補償板の接着積層時やその後の加熱・加湿処
理あるいは実用時の熱や湿度の作用などで位相差フィル
ムに生じる応力を粘着層が緩和し、位相差フィルムが歪
んでその複屈折により位相差特性が変化することを防止
する。その結果、液晶表示装置等に適用した場合に位相
差特性の変化でコントラストや色特性等がばらついて表
示ムラを発生しにくい光学補償板や光学部材を得ること
ができ、それを用いて液晶の複屈折による位相差を正面
や斜視の広い視角範囲で高度に補償して表示品位に優れ
る液晶表示装置を形成することができる。According to the present invention, when the above-mentioned Y formula is satisfied, a phase difference film is formed on the optical compensator by bonding and laminating the optical compensator, by subsequent heating and humidifying treatment, or by the action of heat and humidity in practical use. The stress is reduced by the adhesive layer, and the retardation film is prevented from being distorted and the retardation characteristic is prevented from being changed by the birefringence. As a result, when applied to a liquid crystal display device or the like, it is possible to obtain an optical compensator or an optical member that does not easily cause display unevenness due to variations in contrast and color characteristics due to a change in phase difference characteristics. A liquid crystal display device having excellent display quality can be formed by highly compensating for a phase difference due to birefringence in a wide viewing angle range of front and perspective.
【０００６】[0006]
【発明の実施形態】本発明による光学補償板は、位相差
フィルムに粘着層を設けてなり、その位相差フィルムの
光弾性係数（ｍ２／Ｎ）と前記粘着層の弾性率（Ｎ／ｍ
２）との積（Ｙ）がＹ≦１．２×１０−５を満足するも
のからなる。また光学部材は、位相差フィルムを粘着層
を介し被着体に接着積層してなり、その位相差フィルム
と粘着層が前記のＹ式を満足するものからなる。液晶表
示装置等に適用した場合に位相差特性が変化しにくいも
のを得る点より好ましい光学補償板や光学部材は、前記
のＹ式がＹ≦７．０×１０−６、特にＹ≦２．５×１０
−７を満足するものである。BEST MODE FOR CARRYING OUT THE INVENTION The optical compensator according to the present invention comprises a retardation film provided with an adhesive layer, and the photoelastic coefficient (m 2 / N) of the retardation film and the elastic modulus (N / m) of the adhesive layer.
2 ) and the product (Y) satisfying Y ≦ 1.2 × 10 −5 . Further, the optical member is formed by bonding and laminating a retardation film to an adherend via an adhesive layer, and the retardation film and the adhesive layer satisfy the above-mentioned Y formula. An optical compensator or an optical member that is preferable from the viewpoint of obtaining a liquid crystal display device or the like whose phase difference characteristics are unlikely to change is preferably such that the above-mentioned Y formula is Y ≦ 7.0 × 10 −6 , particularly Y ≦ 2. 5 × 10
-7 is satisfied.
【０００７】光学補償板や光学部材の形成に用いる位相
差フィルムについては特に限定はなく、光透過性の適宜
なポリマーの１種又は２種以上からなるものであってよ
い。就中、光透過率が７５％以上、特に８５％以上の透
光性に優れる位相差フィルムが好ましく用いうる。The retardation film used for forming the optical compensator and the optical member is not particularly limited, and may be composed of one or more suitable polymers having light transmittance. In particular, a retardation film having a light transmittance of 75% or more, particularly 85% or more and excellent in light transmittance can be preferably used.
【０００８】ちなみに前記の位相差フィルムを形成する
ポリマーの例としては、ポリカーボネート、ポリビニル
アルコール、セルロース系樹脂、ポリエチレンテレフタ
レートやポリエチレンナフタレートの如きポリエステ
ル、ポリアリレート、ポリイミド、ノルボルネン系樹
脂、ポリスルホン、ポリエーテルスルホン、ポリプロピ
レンの如きポリオレフィン、ポリアミド、ポリイミド、
アクリル系樹脂、それらの他種モノマーとの共重合体化
等による変性体などがあげられる。Examples of the polymer forming the retardation film include polycarbonate, polyvinyl alcohol, cellulose resin, polyester such as polyethylene terephthalate and polyethylene naphthalate, polyarylate, polyimide, norbornene resin, polysulfone, and polyether. Sulfone, polyolefin such as polypropylene, polyamide, polyimide,
Acrylic resins, modified products obtained by copolymerization with other types of monomers, and the like can be given.
【０００９】位相差フィルムは、例えば芳香環含有のエ
ステル成分を含むポリマーとオレフィン・マレイミド系
共重合体との混合物の如く２種以上のポリマーを用いて
形成したものであってもよい。耐熱性に優れる光学補償
板や光学部材を得る点よりは、延伸方向の屈折率が高く
なる正の複屈折性を示すポリマーからなる位相差フィル
ムが好ましく用いうる。The retardation film may be formed by using two or more kinds of polymers such as a mixture of a polymer containing an aromatic ring-containing ester component and an olefin / maleimide copolymer. From the viewpoint of obtaining an optical compensator or an optical member having excellent heat resistance, a retardation film made of a polymer having a positive birefringence and having a high refractive index in the stretching direction can be preferably used.
【００１０】位相差フィルムは、例えば流延法等のキャ
スティング法や押出法などの適宜な方式でポリマーをフ
ィルム化しそのフィルムを延伸処理して位相差特性を制
御する方式などの適宜な方式で形成したものであってよ
い。前記のフィルム化にはキャスティング法等の溶液製
膜法が厚さムラや配向歪ムラ等の少ないフィルムを得る
点より好ましく用いうる。The retardation film is formed by an appropriate method such as a method of forming a polymer into a film by an appropriate method such as a casting method such as a casting method or an extrusion method and controlling the retardation characteristics by stretching the film. May be done. For the film formation, a solution casting method such as a casting method can be preferably used from the viewpoint of obtaining a film with less thickness unevenness and orientation distortion unevenness.
【００１１】また前記の延伸処理には、一軸や二軸等の
適宜な延伸方式の１種又は２種以上を適用でき、例えば
熱収縮性フィルムを接着して加熱によるその熱収縮性フ
ィルムの収縮力の作用下にポリマーフィルムが収縮する
ように延伸処理して位相差特性、特に厚さ方向の屈折率
を制御する方式なども適用することができる。延伸処理
温度は、処理操作の制御性による位相差の高精度化など
の点よりポリマーフィルムのガラス転移温度の近傍、就
中ガラス転移温度以上とすることが好ましい。位相差フ
ィルムの厚さは、目的とする位相差特性などにより適宜
に決定することができる。一般には薄型化等の点より５
〜３００μm、就中１０〜２００μm、特に２０〜１５０
μmの厚さとされる。In the above-mentioned stretching treatment, one or more kinds of appropriate stretching methods such as uniaxial and biaxial can be applied. For example, a heat-shrinkable film is adhered, and the heat-shrinkable film is shrunk by heating. It is also possible to apply a method of controlling the retardation characteristics, particularly the refractive index in the thickness direction, by performing a stretching treatment so that the polymer film contracts under the action of force. The stretching temperature is preferably in the vicinity of the glass transition temperature of the polymer film, especially higher than the glass transition temperature, from the viewpoint of increasing the precision of the phase difference due to the controllability of the processing operation. The thickness of the retardation film can be appropriately determined depending on the intended retardation characteristics and the like. Generally 5 from the point of thinning etc.
~ 300 m, especially 10-200 m, especially 20-150
μm thickness.
【００１２】光学補償板を形成する位相差フィルムに設
ける粘着層、又は光学部材を形成する位相差フィルムを
粘着層を介し被着体に接着積層する場合の粘着層につい
ては、上記のＹ式を満足する組合せとする点を除いて特
に限定はない。従って粘着層の形成には、例えばアクリ
ル系重合体やシリコーン系ポリマー、ポリエステルやポ
リウレタン、ポリエーテルや合成ゴムなどの適宜なポリ
マーの１種又は２種以上を用いてなる透明な粘着剤を用
いることができる。就中、光学的透明性や粘着特性、耐
候性などの点よりアクリル系粘着剤が好ましい。For the adhesive layer provided on the retardation film forming the optical compensator or the adhesive layer when the retardation film forming the optical member is adhered and laminated on the adherend via the adhesive layer, the above Y formula is used. There is no particular limitation except that the combination is satisfied. Therefore, for forming the pressure-sensitive adhesive layer, use of a transparent pressure-sensitive adhesive using one or more appropriate polymers such as acrylic polymers, silicone polymers, polyesters, polyurethanes, polyethers, and synthetic rubbers, for example. Can be. Above all, acrylic pressure-sensitive adhesives are preferred from the viewpoints of optical transparency, adhesive properties, weather resistance and the like.
【００１３】粘着層には弾性率の調節等を目的に必要に
応じて例えば天然や合成の樹脂類、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。また微粒子を含有させて光拡散性を示
す粘着層とすることもできる。粘着層が表面に露出する
場合には、それを実用に供するまでの間、セパレータな
どを仮着して粘着層表面の汚染等を防止することが好ま
しい。For the purpose of adjusting the modulus of elasticity of the adhesive layer, for example, fillers, pigments, and coloring agents made of natural or synthetic resins, glass fibers and glass beads, metal powders and other inorganic powders, if necessary. Suitable additives such as antioxidants and antioxidants can also be blended. In addition, an adhesive layer exhibiting light diffusing properties can be formed by incorporating fine particles. When the pressure-sensitive adhesive layer is exposed on the surface, it is preferable to temporarily attach a separator or the like to prevent the contamination or the like of the surface of the pressure-sensitive adhesive layer until the pressure-sensitive adhesive layer is put to practical use.
【００１４】光学部材において位相差フィルムを粘着層
を介し接着積層する対象の被着体については特に限定は
なく、例えば位相差板や偏光板や液晶セルの如く液晶表
示装置などの形成に用いられる適宜な光学層の１種又は
２種以上を少なくとも有するものであればよい。従って
被着体は、位相差板や偏光板等の光学層の単層物からな
るものであってもよいし、２層以上の光学層等が積層さ
れた複層物であってもよい。The adherend to which the retardation film is adhered and laminated via the adhesive layer in the optical member is not particularly limited, and is used for forming a liquid crystal display device such as a retardation plate, a polarizing plate and a liquid crystal cell. What is necessary is just to have at least one or two or more appropriate optical layers. Therefore, the adherend may be formed of a single layer of optical layers such as a retardation plate or a polarizing plate, or may be a multilayer of two or more optical layers or the like.
【００１５】光学部材は、液晶表示装置等の製造過程で
光学層を順次別個に積層する方式にてもそれに準じた積
層形態を形成しうるが、予め光学層を接着積層してなる
光学部材とすることにより、光学系のズレ防止やゴミ等
の異物の侵入防止などによる品質の安定性や積層作業性
等に優れて液晶表示装置等の製造効率を向上させうる利
点などがある。Although the optical member can be formed in a laminated form according to the method in which optical layers are sequentially and separately laminated in a manufacturing process of a liquid crystal display device or the like, an optical member formed by bonding and laminating optical layers in advance. By doing so, there is an advantage that the quality of the optical system is improved by preventing the displacement of the optical system and the intrusion of foreign matter such as dust, the laminating workability, and the like, and the manufacturing efficiency of the liquid crystal display device and the like can be improved.
【００１６】前記した被着体としての位相差板は、１／
２や１／４等の各種波長板、液晶セルの視野角の拡大や
コントラストの向上などを目的とした光学補償板などの
適宜な目的を有するものであってよい。位相差板として
は、上記した位相差フィルムなどからなる、使用目的に
応じた適宜なものを用いうる。被着体としての位相差板
が光学補償板である場合、位相差フィルム等を粘着層を
介し重畳接着した光学部材となるが、これは液晶セルの
補償効果の高度化などに有効である。The phase difference plate as the above-mentioned adherend is 1 /
It may have an appropriate purpose, such as various wavelength plates such as 2 or 1/4, an optical compensator for expanding the viewing angle of the liquid crystal cell and improving the contrast, and the like. As the retardation plate, an appropriate retardation film made of the above-described retardation film or the like according to the intended use can be used. When the retardation plate as the adherend is an optical compensator, the optical member is an optical member in which a retardation film or the like is superposed and adhered via an adhesive layer, which is effective for enhancing the compensation effect of the liquid crystal cell.
【００１７】ちなみに正面と斜視の広範囲の補償には、
ＴＮ型の液晶セルでは正面方向のコントラストを維持し
つつ斜視方向の位相差を補償する必要があり、π型の液
晶セルでは正面と斜視方向の位相差を補償する必要があ
るが、その場合に位相差フィルムを重畳した光学部材と
することで前記の補償効果を高めることができる。なお
被着体として位相差板を用いる場合にはその位相差特性
の変化を防止する点より位相差板の接着積層には上記の
Ｙ式を満足する組合せの粘着層を用いることが好まし
い。By the way, for a wide range of front and perspective compensation,
In a TN type liquid crystal cell, it is necessary to compensate for the phase difference in the oblique direction while maintaining the contrast in the front direction. In a π type liquid crystal cell, it is necessary to compensate for the phase difference in the front and oblique directions. The above-mentioned compensation effect can be enhanced by using an optical member on which a retardation film is superimposed. When a retardation plate is used as the adherend, it is preferable to use a combination of adhesive layers that satisfies the above-mentioned Y formula for the adhesive lamination of the retardation plate from the viewpoint of preventing a change in retardation characteristics.
【００１８】一方、前記した偏光板との接着積層による
光学部材は、光学補償型の偏光板として機能するもので
あるがその形成に際して位相差フィルムの進相軸と偏光
板の透過軸等は適宜に決定でき、それらの光軸の配置角
度について特に限定はない。一般には偏光板の透過軸と
位相差フィルムの面内最大屈折率方向を平行関係又は直
交関係に配置することが、正面方向の特性に影響を与え
ずに斜視方向の特性を制御して視野角の拡大等を図る点
より好ましい。光学補償偏光板は、偏光板に２層以上の
光学補償板を設けた形態のものとすることもできる。On the other hand, the optical member formed by bonding and laminating the polarizing plate functions as an optically compensating polarizing plate. In forming the optical member, the fast axis of the retardation film and the transmission axis of the polarizing plate are appropriately adjusted. And there is no particular limitation on the arrangement angles of those optical axes. Generally, it is possible to arrange the transmission axis of the polarizing plate and the in-plane maximum refractive index direction of the retardation film in a parallel relationship or an orthogonal relationship, by controlling the characteristics in the oblique direction without affecting the characteristics in the front direction and the viewing angle. It is preferable from the viewpoint of enlarging and the like. The optical compensation polarizing plate may have a form in which two or more optical compensation plates are provided on the polarizing plate.
【００１９】光学補償偏光板の形成には、適宜な偏光板
を用いることができ、その種類について特に限定はな
い。就中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の如く、所定振動面の
直線偏光を透過し、他の光は吸収する特性を示す吸収型
の偏光板が高い偏光度を達成する点などより好ましく用
いうる。For forming the optical compensation polarizing plate, an appropriate polarizing plate can be used, and the type thereof is not particularly limited. Among them, a hydrophilic polymer film such as a polyvinyl alcohol-based film, a partially formalized polyvinyl alcohol-based film, an ethylene-vinyl acetate copolymer-based partially saponified film, and a film stretched by adsorbing iodine and / or a dichroic dye, An absorption type that transmits linearly polarized light with a predetermined vibration plane and absorbs other light, such as a polarizing film made of a polyene oriented film, such as a dehydrated product of polyvinyl alcohol or a dehydrochlorinated product of polyvinyl chloride. Are more preferably used in that a high degree of polarization is achieved.
【００２０】前記の偏光板は、偏光フィルムの片側又は
両側に透明保護層を設けたものなどであってもよい。透
明保護層は、偏光フィルムの補強、耐熱性や耐湿性の向
上などの種々の目的で設けられ、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。ちなみにその例としては上
記の位相差フィルムで例示したポリマー、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。The polarizing plate may be a polarizing film having a transparent protective layer provided on one side or both sides. The transparent protective layer is provided for various purposes such as reinforcement of the polarizing film, improvement of heat resistance and moisture resistance, and the formation thereof includes a polymer having excellent transparency, mechanical strength, heat stability, moisture shielding property, and the like. It is preferably used. Incidentally, examples thereof include the polymers exemplified in the above retardation film, and thermosetting resins such as acrylic, urethane, acrylic urethane, epoxy, and silicone, and ultraviolet-curing resins.
【００２１】透明保護層は、樹脂の塗布層や樹脂フィル
ムのラミネート層などとして形成でき、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。
その微粒子には、例えば平均粒径が０．５〜２０μmの
シリカや酸化カルシウム、アルミナやチタニア、ジルコ
ニアや酸化錫、酸化インジウムや酸化カドミウム、酸化
アンチモン等の導電性のこともある無機系微粒子や、ポ
リメチルメタクリレートやポリウレタの如き適宜なポリ
マーからなる架橋又は未架橋の有機系微粒子などの適宜
なものを１種又は２種以上用いうる。The transparent protective layer can be formed as a resin coating layer or a resin film laminate layer, and the surface thereof may be formed into a fine uneven structure by containing fine particles.
The fine particles include, for example, inorganic fine particles such as silica or calcium oxide having an average particle diameter of 0.5 to 20 μm, alumina or titania, zirconia or tin oxide, indium oxide or cadmium oxide, or antimony oxide. One or two or more appropriate materials such as crosslinked or uncrosslinked organic fine particles made of a suitable polymer such as polymethyl methacrylate or polyurethane may be used.
【００２２】また偏光板は、特に位相差フィルムを設け
ない側に表面反射の防止などを目的に反射防止層や防眩
処理層が設けられたものであってもよい。反射防止層
は、例えばフッ素系ポリマーのコート層や多層金属蒸着
膜等の光干渉性の膜などとして適宜に形成することがで
きる。一方、防眩処理層も、例えば微粒子含有の樹脂塗
工層やエンボス加工、サンドブラスト加工やエッチング
加工等の適宜な方式で表面に微細凹凸構造を付与するな
どにより表面反射光が拡散する適宜な方式で形成したも
のであってよい。The polarizing plate may be provided with an anti-reflection layer or an anti-glare treatment layer on the side where no retardation film is provided, for the purpose of preventing surface reflection. The antireflection layer can be appropriately formed, for example, as a light interference film such as a fluorine polymer coat layer or a multilayer metal vapor deposition film. On the other hand, the anti-glare treatment layer also has an appropriate method in which the surface reflected light is diffused by, for example, imparting a fine uneven structure to the surface by an appropriate method such as a resin coating layer containing fine particles, embossing, sand blasting or etching. May be formed.
【００２３】さらに偏光板は、反射層やハーフミラー等
を有する反射型や半透過型のものなどであってもよい。
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。Further, the polarizing plate may be of a reflection type or a semi-transmission type having a reflection layer, a half mirror and the like.
The reflective polarizing plate is used to form a liquid crystal display device or the like that reflects and reflects incident light from the viewing side (display side). There are advantages such as easy reduction in thickness of the display device.
【００２４】反射型偏光板の形成は、必要に応じ透明保
護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る。そ
の具体例としては必要に応じマット処理した透明保護層
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、前記透明保護層の微粒子含有に
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。半透過型偏光板は、前記の反射層をハーフミラー等
の半透過型のものとすることにより得ることができる。The reflection type polarizing plate can be formed by an appropriate method such as a method in which a reflective layer made of metal or the like is provided on one side of the polarizing plate via a transparent protective layer or the like, if necessary. Specific examples thereof include a transparent protective layer, which is matted as required, and a foil or a vapor-deposited film made of a reflective metal such as aluminum provided on one surface, or a fine surface irregularity structure containing fine particles in the transparent protective layer. And a metal reflective layer provided by an appropriate method such as a vapor deposition method or a plating method. The transflective polarizing plate can be obtained by making the above-mentioned reflective layer a transflective type such as a half mirror.
【００２５】光学部材には例えば液晶セル等の他部材と
接着することを目的にその片面又は両面に粘着層を設け
ることもできる。その場合、当該粘着層が位相差フィル
ムに隣接することとなるときには上記したＹ式を満足す
る組合せとすることが位相差特性の変化防止などの点よ
り好ましい。上記した光学補償板や光学部材を形成する
位相差フィルムや偏光板、透明保護層や粘着層などの各
層は、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。The optical member may be provided with an adhesive layer on one or both sides for the purpose of bonding to another member such as a liquid crystal cell. In this case, when the pressure-sensitive adhesive layer is to be adjacent to the retardation film, it is preferable to use a combination that satisfies the above-described Y formula from the viewpoint of preventing a change in retardation characteristics. Each layer such as a retardation film or a polarizing plate, a transparent protective layer or an adhesive layer that forms the above-described optical compensator or optical member is, for example, a salicylic acid ester compound or a benzophenone compound, a benzotriazole compound or a cyanoacrylate compound, or nickel. Ultraviolet absorbing ability can be provided by a method of treating with an ultraviolet absorbent such as a complex salt compound.
【００２６】本発明による光学補償板や光学部材は、例
えば正面方向でのコントラストの低下を防止した斜視方
向の位相差の補償や、正面と斜視方向の位相差の補償等
の、ＴＮ型やＳＴＮ型、π型やＶＡ型等の各種の液晶セ
ルにおける視野角の拡大やコントラストの向上などを目
的とした液晶セルの複屈折による位相差の補償による視
角特性の改善などに好ましく用いうる。The optical compensator and the optical member according to the present invention are of the TN type or the STN type, for example, for compensating the phase difference in the oblique direction in which the contrast in the front direction is prevented and compensating the phase difference in the front and oblique directions. It can be preferably used for improving viewing angle characteristics by compensating for a phase difference due to birefringence of a liquid crystal cell for the purpose of expanding a viewing angle and improving a contrast in various liquid crystal cells such as a liquid crystal cell, a π type and a VA type.
【００２７】光学補償板や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。すなわち液晶表
示装置は一般に、液晶セルと光学補償板及び必要に応じ
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
明においては光学補償板又は光学部材を用いて液晶セル
の少なくとも片側に位相差フィルムを設ける点を除いて
特に限定はなく、従来に準じうる。The formation of the liquid crystal display device using the optical compensator and the optical member can be performed according to the conventional method. That is, a liquid crystal display device is generally formed by appropriately assembling components such as a liquid crystal cell, an optical compensator, and a polarizing plate and an illumination system as needed, and incorporating a drive circuit. There is no particular limitation except that a retardation film is provided on at least one side of the liquid crystal cell using a compensating plate or an optical member, and can be in accordance with a conventional method.
【００２８】従って液晶セルの片側又は両側に光学補償
板ないし位相差フィルムと共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反射板
や半透過型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。Accordingly, a liquid crystal display device in which a polarizing plate is disposed together with an optical compensator or a retardation film on one or both sides of a liquid crystal cell, a transmission type using a backlight or a reflector or a transflective reflector for an illumination system, An appropriate liquid crystal display device such as a reflection type or a reflection / transmission type can be formed.
【００２９】偏光板を用いた液晶表示装置の場合、図例
の如く光学補償板ないし位相差フィルム１は、視認側又
は／及び視認背面側の液晶セル３と偏光板２の間、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。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 case of a liquid crystal display device using a polarizing plate, as shown in the figure, the optical compensator or the retardation film 1 is provided between the liquid crystal cell 3 and the polarizing plate 2 on the viewing side or / and the back side of the viewing side, particularly on the viewing side. It is more preferable to dispose it between the polarizing plate and the polarizing plate. In the arrangement, the optical member described above may be used.
【００３０】前記において液晶表示装置の形成部品は、
その全部が積層一体化されていてもよいし、その一部が
分離状態にあってもよい。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、反射防止膜や
プリズムシート、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。かかる素子は、位相差
フィルムと積層してなる上記した光学部材として液晶表
示装置の形成に供することもできる。In the above description, the forming parts of the liquid crystal display device are as follows:
The whole may be laminated and integrated, or a part thereof may be in a separated state. In forming the liquid crystal display device, for example, appropriate optical elements such as a diffusion plate, an anti-glare layer, an antireflection film, a prism sheet, a protective layer and a protective plate can be appropriately arranged. Such an element can be used for forming a liquid crystal display device as the above-mentioned optical member laminated with a retardation film.
【００３１】[0031]
【実施例】参考例１ ブチルアクリレート８９部（重量部、以下同じ）、アク
リル酸１０部及びヒドロキシヘキシルアクリレート１部
を酢酸エチル中で溶液重合し、その溶液に固形分１００
部あたり１部のイソシアネート系架橋剤を加えて粘着剤
を得た。この粘着剤は、それをセパレータ上に塗布して
乾燥することにより弾性率が１５７６００Ｎ／ｍ２の粘
着層を形成する。Reference Example 1 89 parts (parts by weight, hereinafter the same) of butyl acrylate, 10 parts of acrylic acid and 1 part of hydroxyhexyl acrylate were subjected to solution polymerization in ethyl acetate, and a solid content of 100 parts was added to the solution.
One part per part of an isocyanate-based crosslinking agent was added to obtain a pressure-sensitive adhesive. This adhesive forms an adhesive layer having an elastic modulus of 157600 N / m 2 by applying it on a separator and drying it.
【００３２】参考例２ ブチルアクリレート９０部とアクリル酸１０部を酢酸エ
チル中で溶液重合し、その溶液に固形分１００部あたり
０．５部のイソシアネート系架橋剤を加えて粘着剤を得
た。この粘着剤は、それをセパレータ上に塗布して乾燥
することにより弾性率が６８６００Ｎ／ｍ２の粘着層を
形成する。REFERENCE EXAMPLE 2 90 parts of butyl acrylate and 10 parts of acrylic acid were subjected to solution polymerization in ethyl acetate, and 0.5 part of an isocyanate-based crosslinking agent was added to 100 parts of the solution to obtain a pressure-sensitive adhesive. This adhesive forms an adhesive layer having an elastic modulus of 68600 N / m 2 by applying it on a separator and drying it.
【００３３】参考例３ イソオクチルアクリレート９８部、アクリル酸１部及び
ヒドロキシヘキシルアクリレート１部を酢酸エチル中で
溶液重合し、その溶液に固形分１００部あたり０．１部
のイソシアネート系架橋剤を加えて粘着剤を得た。この
粘着剤は、それをセパレータ上に塗布して乾燥すること
により弾性率が４９０００Ｎ／ｍ２の粘着層を形成す
る。Reference Example 3 98 parts of isooctyl acrylate, 1 part of acrylic acid and 1 part of hydroxyhexyl acrylate were solution-polymerized in ethyl acetate, and 0.1 part of an isocyanate crosslinking agent was added to the solution per 100 parts of solids. To obtain an adhesive. This pressure-sensitive adhesive is applied on a separator and dried to form a pressure-sensitive adhesive layer having an elastic modulus of 49000 N / m 2 .
【００３４】実施例１ 光弾性係数が４．１×１０−１２ｍ２／Ｎのノルボルネ
ン系樹脂（ＪＳＲ社製、アートン）による延伸フィルム
からなる位相差フィルムに参考例１による粘着層をセパ
レータより移着して光学補償板（Ｙ＝６．４６×１０
−７）を得た。Example 1 A pressure-sensitive elastic layer having a photoelastic coefficient of 4.1 × 10 −12 m 2 / N (arton) made of a norbornene-based resin (ARTON, manufactured by JSR Corporation) was used as a retardation film. Transferred to the optical compensator (Y = 6.46 × 10
-7 ) was obtained.
【００３５】実施例２ 参考例２による粘着層を移着したほかは実施例１に準じ
て光学補償板（Ｙ＝２．８１×１０−７）を得た。Example 2 An optical compensator (Y = 2.81 × 10 −7 ) was obtained in the same manner as in Example 1 except that the adhesive layer according to Reference Example 2 was transferred.
【００３６】実施例３ 参考例３による粘着層を移着したほかは実施例１に準じ
て光学補償板（Ｙ＝２．０１×１０−７）を得た。Example 3 An optical compensator (Y = 2.01 × 10 −7 ) was obtained in the same manner as in Example 1 except that the adhesive layer according to Reference Example 3 was transferred.
【００３７】実施例４ 芳香環含有のエステル成分を含むポリマー（帝人化成社
製）とオレフィン・マレイミド系共重合体（東ソー社
製）の塩化メチレン溶液を固形分による前者／後者の重
量比で７／３の割合で混合し、それを流延乾燥法でフィ
ルム化し、その光弾性係数が５．６×１０−１１ｍ２／
Ｎのフィルムを延伸してなる位相差フィルムに参考例１
による粘着層をセパレータより移着して光学補償板（Ｙ
＝８．８３×１０−６）を得た。Example 4 A methylene chloride solution of a polymer containing an aromatic ring-containing ester component (manufactured by Teijin Chemicals Ltd.) and an olefin / maleimide copolymer (manufactured by Tosoh Corporation) was used in a weight ratio of 7 for the former / latter based on the solid content. / 3, and it was cast into a film by the casting drying method, and its photoelastic coefficient was 5.6 × 10 −11 m 2 /
Reference Example 1 for retardation film obtained by stretching N film
Transfer the adhesive layer from the separator to the optical compensator (Y
= 8.83 × 10 −6 ).
【００３８】実施例５ 参考例２による粘着層を移着したほかは実施例４に準じ
て光学補償板（Ｙ＝３．８４×１０−６）を得た。Example 5 An optical compensator (Y = 3.84 × 10 −6 ) was obtained in the same manner as in Example 4 except that the adhesive layer according to Reference Example 2 was transferred.
【００３９】実施例６ 参考例３による粘着層を移着したほかは実施例４に準じ
て光学補償板（Ｙ＝２．７４×１０−６）を得た。Example 6 An optical compensator (Y = 2.74 × 10 −6 ) was obtained in the same manner as in Example 4 except that the adhesive layer according to Reference Example 3 was transferred.
【００４０】実施例７ 光弾性係数が８．０×１０−１１ｍ２／Ｎのポリカーボ
ネートによる延伸フィルムからなる位相差フィルムに参
考例２による粘着層をセパレータより移着して光学補償
板（Ｙ＝５．４９×１０−６）を得た。Example 7 An adhesive layer according to Reference Example 2 was transferred from a separator to a retardation film composed of a stretched film made of polycarbonate having a photoelastic coefficient of 8.0 × 10 −11 m 2 / N, and an optical compensator (Y = 5.49 × 10 -6 ).
【００４１】実施例８ 参考例３による粘着層を移着したほかは実施例７に準じ
て光学補償板（Ｙ＝３．９２×１０−６）を得た。Example 8 An optical compensator (Y = 3.92 × 10 −6 ) was obtained in the same manner as in Example 7, except that the adhesive layer according to Reference Example 3 was transferred.
【００４２】比較例 参考例１による粘着層を移着したほかは実施例７に準じ
て光学補償板（Ｙ＝１．２６×１０−５）を得た。Comparative Example An optical compensator (Y = 1.26 × 10 −5 ) was obtained in the same manner as in Example 7 except that the adhesive layer according to Reference Example 1 was transferred.
【００４３】評価試験 実施例、比較例で得た光学補償板の上に粘着層付き偏光
板（ＨＥＧ１４２５ＤＵ、日東電工社製）をその粘着層
を介し接着積層して光学部材Ａを形成しそれを光学補償
板に設けた粘着層を介してガラス板に接着し、一方、前
記光学補償板の複屈折による位相差を打ち消す位相差フ
ィルムを用いて前記に準じ光学部材Ｂを形成しそれをガ
ラス板に接着して光学部材Ａに対し偏光板がクロスニコ
ル（黒表示の状態）となるようにガラス板同士を隣接さ
せて配置した。ついでそれをライトテーブル上に配置
し、その面上での黒状態の均一性と光漏れを目視観察し
て表示ムラを調べ、１を表示ムラが著しい最低状態と
し、３以上を合格品として５段階評価した。その結果を
次表に示した。Evaluation Test A polarizing plate with an adhesive layer (HEG1425DU, manufactured by Nitto Denko Corporation) was bonded and laminated on the optical compensator obtained in each of Examples and Comparative Examples via the adhesive layer to form an optical member A. The optical member B is adhered to the glass plate via an adhesive layer provided on the optical compensator, and the optical member B is formed according to the above using a retardation film for canceling the retardation due to birefringence of the optical compensator, and the glass member is formed on the glass plate. The glass plates were arranged adjacent to each other so that the polarizing plate was crossed with the optical member A (state of black display). Then, it was placed on a light table, and the display uniformity was checked by visually observing the uniformity of the black state and the light leakage on the surface. It was rated on a scale. The results are shown in the following table.
【００４４】 [0044]
【図１】液晶表示装置例の断面図FIG. 1 is a cross-sectional view of an example of a liquid crystal display device.
１：位相差フィルム ２：偏光板 ３：液晶セル 1: retardation film 2: polarizing plate 3: liquid crystal cell
───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐々木 伸一 大阪府茨木市下穂積１丁目１番２号日東電 工株式会社内 Ｆターム(参考） 2H049 BA06 BA07 BB03 BB48 BB51 BB63 BB65 BC22 2H091 FA08X FA08Z FA11X FA11Z FB02 FB08 FC14 GA16 GA17 HA07 HA10 LA04 LA06 LA07 LA11 LA17 LA19 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinichi Sasaki 1-2-1 Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation F-term (reference) 2H049 BA06 BA07 BB03 BB48 BB51 BB63 BB65 BC22 2H091 FA08X FA08Z FA11X FA11Z FB02 FB08 FC14 GA16 GA17 HA07 HA10 LA04 LA06 LA07 LA11 LA17 LA19
Claims (4)
その位相差フィルムの光弾性係数（ｍ２／Ｎ）と前記粘
着層の弾性率（Ｎ／ｍ２）との積（Ｙ）がＹ≦１．２×
１０−５を満足することを特徴とする光学補償板。An adhesive layer is provided on a retardation film,
The product (Y) of the photoelastic coefficient (m 2 / N) of the retardation film and the elastic modulus (N / m 2 ) of the adhesive layer is Y ≦ 1.2 ×
An optical compensator that satisfies 10-5 .
接着積層してなり、前記位相差フィルムの光弾性係数
（ｍ２／Ｎ）と前記粘着層の弾性率（Ｎ／ｍ２）との積
（Ｙ）がＹ≦１．２×１０−５を満足することを特徴と
する光学部材。2. A retardation film is adhered and laminated on an adherend via an adhesive layer, and a photoelastic coefficient (m 2 / N) of the retardation film and an elastic modulus (N / m 2 ) of the adhesive layer are provided. The product (Y) of the optical member satisfies Y ≦ 1.2 × 10 −5 .
偏光板又は液晶セルの１種又は２種以上を有するもので
ある光学部材。3. The method according to claim 2, wherein the adherend is a retardation plate,
An optical member having one or more of a polarizing plate and a liquid crystal cell.
ることを特徴とする液晶表示装置。4. A liquid crystal display comprising the optical member according to claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000079516A JP2001264538A (en) | 2000-03-22 | 2000-03-22 | Optical compensation plate, optical member and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000079516A JP2001264538A (en) | 2000-03-22 | 2000-03-22 | Optical compensation plate, optical member and liquid crystal display device |
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| Publication Number | Publication Date |
|---|---|
| JP2001264538A true JP2001264538A (en) | 2001-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000079516A Pending JP2001264538A (en) | 2000-03-22 | 2000-03-22 | Optical compensation plate, optical member and liquid crystal display device |
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| JP (1) | JP2001264538A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004068201A1 (en) * | 2003-01-27 | 2004-08-12 | Nitto Denko Corporation | Polarization plate with pressure-sensitive adhesive type optical compensation layer and image display |
| US7767286B2 (en) | 2006-12-28 | 2010-08-03 | Fujifilm Corporation | Polarizing plate and liquid crystal display device |
| US7982826B2 (en) | 2006-02-28 | 2011-07-19 | Fujifilm Corporation | Polarizing plate and liquid crystal display |
| JP2020126275A (en) * | 2020-05-15 | 2020-08-20 | 住友化学株式会社 | Polarizing plate |
-
2000
- 2000-03-22 JP JP2000079516A patent/JP2001264538A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004068201A1 (en) * | 2003-01-27 | 2004-08-12 | Nitto Denko Corporation | Polarization plate with pressure-sensitive adhesive type optical compensation layer and image display |
| CN100356208C (en) * | 2003-01-27 | 2007-12-19 | 日东电工株式会社 | Polarization plate with pressure-sensitive adhesive type optical compensation layer and image display |
| US7622168B2 (en) | 2003-01-27 | 2009-11-24 | Nitto Denko Corporation | Polarizing plate with pressure-sensitive adhesive type optical compensation layer and image display |
| TWI406041B (en) * | 2003-01-27 | 2013-08-21 | Nitto Denko Corp | A polarizing plate and an image display device with an adhesive optical compensation layer |
| US7982826B2 (en) | 2006-02-28 | 2011-07-19 | Fujifilm Corporation | Polarizing plate and liquid crystal display |
| US8400592B2 (en) | 2006-02-28 | 2013-03-19 | Fujifilm Corporation | Polarizing plate and liquid crystal display |
| US7767286B2 (en) | 2006-12-28 | 2010-08-03 | Fujifilm Corporation | Polarizing plate and liquid crystal display device |
| JP2020126275A (en) * | 2020-05-15 | 2020-08-20 | 住友化学株式会社 | Polarizing plate |
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