JP2000199819A - Polarizing plate, its manufacture, optical member and liquid crystal display device - Google Patents
Polarizing plate, its manufacture, optical member and liquid crystal display deviceInfo
- Publication number
- JP2000199819A JP2000199819A JP10377482A JP37748298A JP2000199819A JP 2000199819 A JP2000199819 A JP 2000199819A JP 10377482 A JP10377482 A JP 10377482A JP 37748298 A JP37748298 A JP 37748298A JP 2000199819 A JP2000199819 A JP 2000199819A
- Authority
- JP
- Japan
- Prior art keywords
- film
- polarizing plate
- layer
- liquid crystal
- optical
- 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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Landscapes
- Liquid Crystal (AREA)
- Surface Treatment Of Optical Elements (AREA)
- Optical Elements Other Than Lenses (AREA)
- Polarising Elements (AREA)
Abstract
Description
【０００１】[0001]
【発明の技術分野】本発明は、薄型軽量性に優れてモバ
イル用途の液晶表示装置等の形成に好適な偏光板、その
製造方法、及び光学部材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing plate excellent in thinness and lightness and suitable for forming a liquid crystal display device for mobile use, a method for manufacturing the same, and an optical member.
【０００２】[0002]
【発明の背景】従来、偏光板としては、親水性高分子か
らなる偏光フィルムに透明フィルムからなる保護層を接
着剤を介し接着したものが知られていたが、液晶表示装
置のノート型パーソナルコンピュータや携帯電話等とし
てのモバイル用途への普及に伴い、更なる薄型軽量化、
あるいは携帯化による使用場所の無限定性の点より更な
る耐久性の向上が求められている。BACKGROUND OF THE INVENTION Hitherto, as a polarizing plate, a polarizing plate made of a hydrophilic polymer and a protective layer made of a transparent film bonded via an adhesive has been known, but a notebook personal computer of a liquid crystal display device has been known. And thinner and lighter with the spread of mobile applications such as mobile phones
Or, there is a demand for further improvement in durability from the point of unlimited use places due to portability.
【０００３】しかしながら、透明フィルムの接着剤を介
した接着方式では、作業時の取扱性などの点より透明フ
ィルムを薄くすることに限界があり、その厚さを２０μ
m以下とすることが困難であると共に、接着剤層の介在
による厚さ増大の難点もあり、前記した更なる薄型軽量
化の目的を実現しにくい問題点があった。However, in the bonding method using a transparent film adhesive, there is a limit in making the transparent film thinner in terms of handling at the time of work and the like, and the thickness is reduced to 20 μm.
m or less, and there is a problem in that the thickness is increased due to the interposition of the adhesive layer, and there is a problem that it is difficult to realize the above-mentioned object of further thinning and lightening.
【０００４】一方、前記した更なる耐久性の向上の点よ
りは、保護層として用いる透明フィルムの厚膜化により
達成しうるが、その場合には前記の薄型軽量化に反する
と共に、フィルム厚の増大による接着作業の難度向上の
点もさりながら、切断加工による切断面に亀裂等の光学
欠陥が発生しやすくなる問題点があった。On the other hand, from the viewpoint of further improving the durability, it can be attained by increasing the thickness of the transparent film used as the protective layer. In addition to the increase in the degree of difficulty of the bonding operation due to the increase, there has been a problem that optical defects such as cracks are easily generated on the cut surface by the cutting process.
【０００５】[0005]
【発明の技術的課題】本発明は、従来に匹敵する耐久性
を維持しつつ、より薄型軽量化を達成した偏光板、及び
切断加工性等を害することなくより耐久性の向上を達成
した偏光板を得て、信頼性に優れるモバイル用途の液晶
表示装置を形成しうる光学部材の開発を課題とする。The present invention relates to a polarizing plate which achieves a thinner and lighter weight while maintaining durability comparable to the conventional one, and a polarizing plate which achieves a higher durability without impairing the cutting workability and the like. An object of the present invention is to develop an optical member capable of forming a plate and forming a highly reliable liquid crystal display device for mobile use.
【０００６】[0006]
【課題の解決手段】本発明は、親水性高分子からなる偏
光フィルムの片面又は両面に、そのフィルムを溶解しな
い溶剤による樹脂溶液を塗工し乾燥させて、透明薄膜層
を設けることを特徴とする偏光板の製造方法、並びに親
水性高分子からなる偏光フィルムの片面又は両面に、樹
脂塗工膜からなる透明薄膜層を有し、かつその透明薄膜
層の上に透明フィルムからなる保護層を有することを特
徴とする偏光板、前記方法による又は前記の偏光板と他
の光学機能を示す光学層との積層体からなることを特徴
とする光学部材、及びその光学部材を液晶セルの片側又
は両側に配置してな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。The present invention is characterized in that a transparent thin film layer is provided on one or both sides of a polarizing film made of a hydrophilic polymer by applying a resin solution with a solvent that does not dissolve the film and drying the solution. A method for producing a polarizing plate, and a polarizing film made of a hydrophilic polymer, on one or both sides, having a transparent thin film layer made of a resin coating film, and a protective layer made of a transparent film on the transparent thin film layer. A polarizing plate characterized by having, an optical member characterized by comprising a laminate of the above-described method or a polarizing plate and an optical layer exhibiting another optical function, and the optical member on one side of a liquid crystal cell or A liquid crystal display device characterized by being arranged on both sides is provided.
【０００７】[0007]
【発明の効果】本発明によれば、塗工膜方式により薄膜
を容易に形成できて、接着剤層の介在なく偏光フィルム
に良密着した薄型軽量性に優れる保護層を形成でき、従
来に匹敵する耐久性を有して、より薄型軽量性に優れる
偏光板を得ることができる。またそれに従来型の透明フ
ィルムを接着して、厚膜化による嵩や重量の増大を抑制
しつつ、切断面に亀裂等の光学欠陥が発生しにくい高耐
久性の偏光板を得ることができ、その場合、薄膜塗工層
による補強で偏光フィルムの取扱性に優れて接着作業も
容易に行うことができる。According to the present invention, a thin film can be easily formed by a coating film system, and a protective layer excellent in thinness and light weight, which is in good contact with a polarizing film without the intervention of an adhesive layer, can be formed. It is possible to obtain a polarizing plate that has excellent durability and thinness and lightness. In addition, by bonding a conventional transparent film to it, it is possible to obtain a highly durable polarizing plate in which optical defects such as cracks are hardly generated on the cut surface while suppressing increase in bulk and weight due to thickening, In that case, the polarizing film can be easily handled and the bonding operation can be easily performed by reinforcement with the thin film coating layer.
【０００８】前記の結果、装置組立時の加熱処理や装置
実用時の環境条件に耐える薄型軽量の偏光板や光学部材
を得ることができ、それを用いて信頼性に優れるモバイ
ル用途の液晶表示装置を形成することができる。As a result, it is possible to obtain a thin and lightweight polarizing plate or optical member that can withstand the heat treatment at the time of assembling the device and the environmental conditions at the time of practical use of the device. Can be formed.
【０００９】[0009]
【発明の実施の形態】本発明による製造方法は、親水性
高分子からなる偏光フィルムの片面又は両面に、そのフ
ィルムを溶解しない溶剤による樹脂溶液を塗工し乾燥さ
せて、透明薄膜層を設けることにより偏光板を得るもの
である。その偏光板の例を図１に示した。１、３が透明
薄膜層、２が偏光フィルムである。BEST MODE FOR CARRYING OUT THE INVENTION In the production method according to the present invention, a transparent thin film layer is provided by coating a resin solution with a solvent that does not dissolve the film on one or both sides of a polarizing film made of a hydrophilic polymer and drying the film. Thus, a polarizing plate is obtained. FIG. 1 shows an example of the polarizing plate. 1 and 3 are transparent thin film layers, and 2 is a polarizing film.
【００１０】偏光フィルムとしては、適宜な親水性高分
子からなるものを用いうる。ちなみにその例としては、
ポリビニルアルコール系ポリマーや部分ホルマール化ポ
リビニルアルコール系ポリマー、エチレン・酢酸ビニル
共重合体系部分ケン化ポリマーなどからなるフィルムに
ヨウ素及び／又は二色性染料を吸着させて延伸したもの
などがあげられる。偏光フィルムの厚さは通例５〜８０
μmであるが、これに限定されない。As the polarizing film, a film made of a suitable hydrophilic polymer can be used. By the way, as an example,
A film formed by adsorbing iodine and / or a dichroic dye on a film composed of a polyvinyl alcohol-based polymer, a partially formalized polyvinyl alcohol-based polymer, an ethylene / vinyl acetate copolymer-based partially saponified polymer, or the like is used. The thickness of the polarizing film is usually 5 to 80
μm, but is not limited to this.
【００１１】透明薄膜層は、溶剤による樹脂溶液を偏光
フィルムの片面又は両面に、ワイヤバー方式やドクター
ブレード方式、浸漬方式等の適宜なコート方式で塗工し
てその塗工層を乾燥させることにより形成することがで
きる。その溶剤には、偏光フィルムの光学機能の維持の
ため、偏光フィルムを溶解しないものが用いられるが、
その溶剤の種類については特に限定はなく、例えばトル
エンの如き炭化水素類や酢酸エチルの如きエステル類な
どの適宜な有機溶剤を用いうる。なお樹脂溶液の濃度
は、塗工性や塗工厚などに応じて適宜に決定しうるが、
一般には５〜８０重量％、就中１０〜６０重量％、特に
１５〜４０重量％とされる。The transparent thin film layer is formed by applying a resin solution with a solvent to one or both surfaces of a polarizing film by an appropriate coating method such as a wire bar method, a doctor blade method, or an immersion method, and drying the coating layer. Can be formed. For the solvent, those that do not dissolve the polarizing film are used for maintaining the optical function of the polarizing film,
The type of the solvent is not particularly limited, and an appropriate organic solvent such as a hydrocarbon such as toluene or an ester such as ethyl acetate can be used. Note that the concentration of the resin solution can be appropriately determined according to the coating property and the coating thickness,
It is generally from 5 to 80% by weight, especially from 10 to 60% by weight, especially from 15 to 40% by weight.
【００１２】透明薄膜層を形成する樹脂には、従来の透
明保護層に準じた適宜な樹脂を用いることができ、特に
限定はないが、透明性や機械的強度、熱安定性や水分遮
蔽性等に優れる樹脂が好ましく用いうる。ちなみにその
樹脂の例としては、セルロース系樹脂やポリカーボネー
ト系樹脂、ポリエステル系樹脂やアクリル系樹脂、ポリ
エーテルスルホン系樹脂やポリアミド系樹脂、ポリイミ
ド系樹脂やポリオレフィン系樹脂などがあげられる。就
中、透明性や保護機能などの点よりセルロース系樹脂や
ポリカーボネート系樹脂、ポリエステル系樹脂やアクリ
ル系樹脂が好ましく用いられる。As the resin for forming the transparent thin film layer, an appropriate resin according to the conventional transparent protective layer can be used, and there is no particular limitation, but transparency, mechanical strength, heat stability, and moisture shielding property can be used. A resin having excellent properties can be preferably used. Incidentally, examples of the resin include a cellulose resin, a polycarbonate resin, a polyester resin, an acrylic resin, a polyether sulfone resin, a polyamide resin, a polyimide resin, and a polyolefin resin. Above all, cellulose-based resins, polycarbonate-based resins, polyester-based resins, and acrylic-based resins are preferably used from the viewpoint of transparency and protection function.
【００１３】透明薄膜層の厚さは、適宜に決定しうる
が、薄膜軽量性や保護機能、取扱性や亀裂等を生じない
切断加工性などの点より２０μm以下、就中１８μm以
下、特に０．３〜１５μmの厚さとすることが好まし
い。なお偏光フィルムの両面に透明薄膜層を設ける場
合、その表裏で異なる樹脂からなる透明薄膜層とするこ
ともできる。また透明薄膜層を形成する樹脂溶液の塗工
層の乾燥は、熱風や赤外線等を介した適宜な方式で行っ
てよいが、偏光フィルムが熱収縮しない温度で乾燥処理
することが好ましい。The thickness of the transparent thin film layer can be determined as appropriate, but from the viewpoint of light weight of the thin film, protective function, handleability and cutting workability that does not cause cracks, etc., it is 20 μm or less, particularly 18 μm or less, and particularly 0 μm or less. The thickness is preferably 3 to 15 μm. When a transparent thin film layer is provided on both sides of the polarizing film, the transparent thin film layer may be made of a different resin on both sides. The coating layer of the resin solution forming the transparent thin film layer may be dried by a suitable method using hot air, infrared rays, or the like, but is preferably dried at a temperature at which the polarizing film does not thermally shrink.
【００１４】本発明において上記した樹脂塗工膜からな
る透明薄膜層を設けた偏光板には、必要に応じその透明
薄膜層の上に透明フィルムからなる保護層を設けること
もできる。また偏光板の実用に際しては、その透明薄膜
層の上に必要に応じ前記の保護層を介して偏光機能以外
の光学機能を示す光学層を設けた光学部材とすることも
できる。その光学部材の例を図２に示した。５が接着層
４を介して接着積層した光学層であり、図例ではその光
学層として位相差板を用いている。In the present invention, a protective layer made of a transparent film can be provided on the transparent thin film layer, if necessary, on the polarizing plate provided with the transparent thin film layer made of the resin coating film described above. When the polarizing plate is put to practical use, an optical member having an optical layer exhibiting an optical function other than the polarizing function may be provided on the transparent thin film layer via the above-mentioned protective layer, if necessary. FIG. 2 shows an example of the optical member. Reference numeral 5 denotes an optical layer which is bonded and laminated via an adhesive layer 4, and in the illustrated example, a retardation plate is used as the optical layer.
【００１５】前記した透明薄膜層の上に設ける保護層
は、偏光板の更なる耐久性の向上等を目的とし透明フィ
ルムにて形成される。予めフィルムとしたものを用いる
ことにより、膜欠陥や光学欠陥等のない保護層を容易に
形成することができる。透明フィルムとしては、上記の
透明薄膜層で例示した樹脂、あるいはアクリル系やウレ
タン系、アクリルウレタン系やエポキシ系、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からなる
適宜なものを用いうる。就中、透明性や機械的強度、熱
安定性や水分遮蔽性などに優れる透明フィルムが好まし
く用いうる。The protective layer provided on the transparent thin film layer is formed of a transparent film for the purpose of further improving the durability of the polarizing plate. By using a film formed in advance, a protective layer free from film defects and optical defects can be easily formed. As the transparent film, use is made of any of the resins exemplified in the above transparent thin film layer, or an appropriate one made of a thermosetting or ultraviolet curable resin such as an acrylic resin, a urethane resin, an acrylic urethane resin, an epoxy resin, or a silicone resin. sell. Above all, a transparent film excellent in transparency, mechanical strength, heat stability, moisture shielding property and the like can be preferably used.
【００１６】保護層を形成する透明フィルムの厚さは、
従来に準じた適宜な厚さとすることができる。一般的な
厚さは、２０〜２００μm、就中２５〜１５０μm、特に
３〜１００μmである。なお透明フィルムの透明薄膜層
への接着は、接着剤による方式や熱融着方式などの適宜
な方式で行うことができる。The thickness of the transparent film forming the protective layer is as follows:
The thickness can be appropriately set according to the related art. Typical thicknesses are between 20 and 200 μm, especially between 25 and 150 μm, especially between 3 and 100 μm. The bonding of the transparent film to the transparent thin film layer can be performed by an appropriate method such as a method using an adhesive or a heat fusion method.
【００１７】一方、光学部材の形成を目的に偏光板に積
層する光学層には、例えば反射層ないし半透過型反射層
や光拡散層、位相差板や集光板、輝度向上板などの、液
晶表示装置等の形成に用いられる適宜なものを用いう
る。前記の反射板ないし半透過型反射層や光拡散板は、
反射型ないし半透過型や拡散型、それらの両用型の偏光
板からなる光学部材を形成する場合に用いられるもので
ある。On the other hand, the optical layer laminated on the polarizing plate for the purpose of forming an optical member includes, for example, a liquid crystal such as a reflective layer or a semi-transmissive reflective layer or a light diffusing layer, a retardation plate, a light condensing plate, and a brightness enhancement plate. An appropriate device used for forming a display device or the like can be used. The reflection plate or transflective reflection layer or light diffusion plate,
It is used when forming an optical member comprising a polarizing plate of a reflection type, a transflective type, a diffusion type, or a combination type thereof.
【００１８】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。また半透過型の偏光板は、外光
のある所では前記反射型のものとして、暗所ではバック
ライト等の光源を介して表示するタイプのものとして利
用する液晶表示装置などを形成するためのものである。
一方、拡散型の偏光板は、図３に例示の如く表示光を拡
散して視野角の拡大などを目的とする。The reflection type polarizing plate is for forming a liquid crystal display device or the like of a type that reflects and displays incident light from the viewing side (display side), and omits a built-in light source such as a backlight. This has the advantage that the thickness of the liquid crystal display device can be easily reduced. Further, a transflective polarizing plate is used for forming a liquid crystal display device or the like which is used as a reflective type in a place where external light is present, and is used as a type for displaying through a light source such as a backlight in a dark place. Things.
On the other hand, the diffusion type polarizing plate is intended to diffuse the display light and increase the viewing angle as shown in FIG.
【００１９】反射型偏光板としての光学部材の形成は、
例えば偏光板を形成する透明薄膜層や必要に応じての保
護層にアルミニウム等の反射性金属からなる箔や蒸着膜
を付設して反射層を形成する方式、かかる反射層を透明
基材に付設してなる反射板を偏光板に接着する方式など
の適宜な方式にて行うことができる。また半透過型の偏
光板としての光学部材の形成は、前記の反射層をハーフ
ミラーとする方式やパール顔料等を含有して光透過性を
示す反射板を偏光板に接着する方式などの適宜な方式に
て行うことができる。The formation of the optical member as the reflection type polarizing plate is as follows.
For example, a method of forming a reflective layer by attaching a foil or a vapor-deposited film made of a reflective metal such as aluminum to a transparent thin film layer for forming a polarizing plate or a protective layer as necessary, and attaching such a reflective layer to a transparent base material It can be performed by an appropriate method such as a method of bonding the resulting reflection plate to the polarizing plate. The formation of the optical member as a semi-transmissive polarizing plate may be appropriately performed by using a method in which the reflective layer is a half mirror or a method in which a light-transmissive reflecting plate containing a pearl pigment or the like is bonded to the polarizing plate. Can be performed in a simple manner.
【００２０】一方、拡散型偏光板としての光学部材の形
成は、例えば偏光板を形成する透明薄膜層や必要に応じ
ての保護層にマット処理を施す方式や微粒子含有の樹脂
を塗布する方式、微粒子含有のフィルムを接着する方式
などの適宜な方式で表面に微細凹凸構造を付与すること
により行うことができる。On the other hand, an optical member as a diffusion type polarizing plate is formed by, for example, a method of applying a matting treatment to a transparent thin film layer forming a polarizing plate or an optional protective layer, or a method of applying a resin containing fine particles. It can be performed by providing a fine uneven structure on the surface by an appropriate method such as a method of bonding a film containing fine particles.
【００２１】さらに反射拡散両用型の偏光板としての光
学部材の形成は、例えば前記拡散型偏光板の微細凹凸構
造面にその凹凸構造が反映した反射層を設ける方式など
により行うことができる。微細凹凸構造の反射層は、入
射光を乱反射により拡散させて指向性やギラギラした見
栄えを防止し、明暗のムラを抑制しうる利点などを有す
る。また微粒子含有の樹脂層やフィルムは、入射光及び
その反射光がそれを透過する際に拡散されて明暗ムラを
より抑制しうる利点なども有している。Further, the formation of the optical member as a reflection-diffusion type polarizing plate can be performed by, for example, a method of providing a reflection layer reflecting the uneven structure on the fine uneven structure surface of the diffusion polarizing plate. The reflective layer having the fine uneven structure has an advantage that the incident light is diffused by irregular reflection to prevent directivity and glare, and that unevenness in brightness can be suppressed. In addition, the resin layer or film containing fine particles has an advantage that the incident light and its reflected light are diffused when passing through the resin layer and the film, so that uneven brightness can be further suppressed.
【００２２】前記の表面微細凹凸構造を反映させた反射
層の形成は、例えば真空蒸着方式やイオンプレーティン
グ方式、スパッタリング方式等の蒸着方式やメッキ方式
などの適宜な方式で金属を微細凹凸構造の表面に直接付
設する方法などにより行うことができる。なお前記の表
面微細凹凸構造を形成するために配合する微粒子として
は、例えば平均粒径が０．１〜３０μmのシリカやアル
ミナ、チタニアやジルコニア、酸化錫や酸化インジウ
ム、酸化カドミウムや酸化アンチモン等からなる、導電
性のこともある無機系微粒子、架橋又は未架橋のポリマ
ー等からなる有機系微粒子などの適宜な透明微粒子を用
いうる。The formation of the reflective layer reflecting the above-mentioned fine uneven structure on the surface is performed by forming a metal on the fine uneven structure by an appropriate method such as an evaporation method such as a vacuum evaporation method, an ion plating method, or a sputtering method, or a plating method. It can be performed by a method of directly attaching to the surface. The fine particles blended to form the above-mentioned surface fine uneven structure include, for example, silica and alumina having an average particle diameter of 0.1 to 30 μm, titania and zirconia, tin oxide and indium oxide, cadmium oxide and antimony oxide, and the like. Appropriate transparent fine particles such as inorganic fine particles that may be conductive, and organic fine particles made of a crosslinked or uncrosslinked polymer or the like can be used.
【００２３】他方、上記した光学層としての位相差板
は、液晶セルによる位相差の補償等の種々の目的で用い
られる。その例としては、各種プラスチックの延伸フィ
ルム等からなる複屈折性フィルム、ディスコティック系
やネマチック系の如き液晶ポリマーの配向フィルム、そ
の配向液晶層をフィルム基材上に支持したものなどがあ
げられる。その場合、配向液晶層を支持するフィルム基
材としては、セルロース系フィルムの如く等方性に優れ
るものが好ましく用いうる。On the other hand, the above-mentioned retardation plate as an optical layer is used for various purposes such as compensation of retardation by a liquid crystal cell. Examples thereof include a birefringent film made of a stretched film of various plastics, an oriented film of a liquid crystal polymer such as discotic or nematic, and a film having the oriented liquid crystal layer supported on a film substrate. In that case, as the film substrate supporting the oriented liquid crystal layer, a material having excellent isotropy, such as a cellulose film, can be preferably used.
【００２４】他方、前記の複屈折性フィルムを形成する
プラスチックとしては、例えばポリカーボネートやポリ
ビニルアルコール、ポリスチレンやポリメチルメタクリ
レート、ポリプロピレンやその他のポリオレフィン、ポ
リアリレートやポリアミドなどの適宜なものを用いう
る。延伸フィルムは、一軸や二軸等の適宜な方式で処理
したものであってよい。また熱収縮性フィルムとの接着
下に収縮力又は／及び延伸力を付与する方式などにより
フィルムの厚さ方向の屈折率を制御した複屈折性フィル
ムなどであってもよい。位相差板は、位相差等の光学特
性の制御を目的に２枚以上を用いることもできる。On the other hand, as the plastic forming the birefringent film, for example, an appropriate material such as polycarbonate, polyvinyl alcohol, polystyrene, polymethyl methacrylate, polypropylene, other polyolefin, polyarylate, polyamide, or the like can be used. The stretched film may be processed by an appropriate method such as uniaxial or biaxial. Further, a birefringent film in which the refractive index in the thickness direction of the film is controlled by a method of applying a contraction force and / or a stretching force while adhering to the heat-shrinkable film may be used. Two or more retardation plates can be used for the purpose of controlling optical characteristics such as retardation.
【００２５】集光板は、光路制御等を目的に用いられる
もので、プリズムアレイシートやレンズアレイシート、
あるいはドット付設シートなどとして形成することがで
きる。輝度向上板は、液晶表示装置等における輝度の向
上等を目的として用いられ、その例としてはプリズムア
レイシートやレンズアレイシート、屈折率異方性が相違
する薄膜フィルムの複数を積層して干渉により反射率の
異方性をもつようにした反射型偏光分離シート、コレス
テリック液晶ポリマーの配向フィルムやその配向液晶層
をフィルム基材上に支持した偏光分離シートなどがあげ
られる。The light collector is used for controlling an optical path and the like, and includes a prism array sheet, a lens array sheet,
Alternatively, it can be formed as a dot-attached sheet or the like. The brightness enhancement plate is used for the purpose of improving brightness in a liquid crystal display device and the like, and as an example, a prism array sheet, a lens array sheet, a plurality of thin film films having different refractive index anisotropies are laminated, and interference occurs. Examples include a reflection-type polarized light separating sheet having anisotropy in reflectance, an oriented film of a cholesteric liquid crystal polymer, and a polarized light separating sheet having the oriented liquid crystal layer supported on a film substrate.
【００２６】光学部材は、偏光板と前記した反射層ない
し半透過型反射層や光拡散層、位相差板や集光板、輝度
向上板等の適宜な光学層の１層又は２層以上を使用目的
に応じた適宜な組合せで用いて２層又は３層以上の積層
体として得ることができる。その場合、光拡散層や位相
差板、集光板や輝度向上板等の光学層は、それぞれ２層
以上を配置することもできる。なお各光学層の配置位置
は、使用目的に応じて適宜に決定でき、特に限定はな
い。As the optical member, one or two or more suitable optical layers such as a polarizing plate and the above-mentioned reflecting layer, semi-transmissive reflecting layer, light diffusing layer, retardation plate, light condensing plate, and brightness improving plate are used. It can be obtained as a laminate of two layers or three or more layers by using an appropriate combination according to the purpose. In this case, two or more optical layers such as a light diffusion layer, a retardation plate, a light collector, and a brightness enhancement plate may be arranged. In addition, the arrangement position of each optical layer can be appropriately determined according to the purpose of use, and is not particularly limited.
【００２７】上記した偏光板を形成する必要に応じての
保護層や光学部材を形成する光学層は、図例の如く必要
に応じて接着層４を介し密着一体化されるが、その接着
層の形成には適宜な接着剤を用いることができ、特に限
定はない。接着作業の簡便性や温度差による内部応力の
緩和による光学歪の発生防止などの点よりは粘着層によ
る接着処理が好ましい。The optional protective layer for forming the above-mentioned polarizing plate and the optical layer for forming the optical member are closely adhered and integrated via an adhesive layer 4 as necessary as shown in FIG. A suitable adhesive can be used for the formation of the resin, and there is no particular limitation. Adhesion treatment with an adhesive layer is preferred from the viewpoint of simplicity of the adhesion work and prevention of generation of optical distortion due to relaxation of internal stress due to temperature difference.
【００２８】前記した粘着層の形成には、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
マーをベースポリマーとする粘着性物質や粘着剤を用い
ることができ、特に限定はない。就中、アクリル系粘着
剤の如く光学的透明性に優れ、適度な濡れ性と凝集性と
接着性等の粘着特性を示して、耐候性や耐熱性などに優
れ、加熱や加湿の条件下に浮きや剥がれ等の剥離問題を
生じないものが好ましく用いうる。In the formation of the above-mentioned adhesive layer, for example, an adhesive substance or an adhesive having an appropriate polymer such as an acrylic polymer, a silicone polymer, polyester, polyurethane, polyether or synthetic rubber as a base polymer is used. And there is no particular limitation. Above all, it is excellent in optical transparency like acrylic adhesive, shows moderate wettability, cohesiveness and adhesive properties such as adhesiveness, excellent in weather resistance and heat resistance, etc., under heating and humidifying conditions Those which do not cause a peeling problem such as floating or peeling can be preferably used.
【００２９】ちなみに前記のアクリル系粘着剤の例とし
ては、メチル基やエチル基やブチル基等の炭素数が２０
以下のアルキル基を有する（メタ）アクリル酸のアルキ
ルエステルと、（メタ）アクリル酸や（メタ）アクリル
酸ヒドロキシエチル等の改良成分からなるアクリル系モ
ノマーを、ガラス転移温度が常温以下、就中０℃以下と
なる組合せにて共重合してなる、重量平均分子量が１０
万以上のアクリル系重合体をベースポリマーとするもの
などがあげられるが、これに限定されない。Incidentally, examples of the acrylic pressure-sensitive adhesive include those having 20 or more carbon atoms such as a methyl group, an ethyl group and a butyl group.
An alkyl monomer of the following (meth) acrylic acid having an alkyl group and an acrylic monomer comprising an improving component such as (meth) acrylic acid or hydroxyethyl (meth) acrylate are used. C. and a copolymer having a weight average molecular weight of 10 or less.
Examples thereof include, but are not limited to, those using 10,000 or more acrylic polymers as a base polymer.
【００３０】上記の密着一体化処理に際しては、偏光板
や光学層の片面又は両面に粘着層を設けて密着処理に供
することができる。設ける粘着層は、異なる組成又は種
類等のものの重畳層であってもよい。また両面に粘着層
を設ける場合、偏光板や光学層の表裏において異なる組
成又は種類等の粘着層であってもよい。At the time of the above-mentioned adhesion and integration treatment, a pressure-sensitive adhesive layer can be provided on one or both sides of the polarizing plate or the optical layer and subjected to the adhesion treatment. The provided adhesive layer may be a superposed layer of different compositions or types. In the case where the adhesive layers are provided on both surfaces, the adhesive layers may have different compositions or types on the front and back of the polarizing plate or the optical layer.
【００３１】偏光板や光学層への粘着層の付設は、適宜
な方式で行いうる。その例としては、例えばトルエンや
酢酸エチル等の適宜な溶剤の単独物又は混合物からなる
溶媒に粘着性物質ないしその組成物を溶解又は分散させ
て１０〜４０重量％程度の粘着剤液を調製し、それを流
延方式や塗工方式等の適宜な展開方式で偏光板や光学層
上に直接付設する方式、あるいは前記に準じセパレータ
上に粘着層を形成してそれを偏光板や光学層上に移着す
る方式などがあげられる。The attachment of the adhesive layer to the polarizing plate or the optical layer can be performed by an appropriate method. As an example, for example, an adhesive substance or a composition thereof is dissolved or dispersed in a solvent consisting of an appropriate solvent alone or a mixture such as toluene or ethyl acetate to prepare an adhesive liquid of about 10 to 40% by weight. A method of directly attaching it on a polarizing plate or an optical layer by an appropriate development method such as a casting method or a coating method, or forming an adhesive layer on a separator according to the above and forming it on a polarizing plate or an optical layer. Transfer method to the public.
【００３２】粘着層の厚さは、接着力等に応じて適宜に
決定でき、一般には１〜５００μmとされる。また粘着
層は、液晶セル等の被着体への接着を目的として、必要
に応じ偏光板や光学部材の外表面に設けることもでき
る。かかる粘着層が表面に露出する場合には、実用に供
するまでの間その表面をセパレータなどで被覆保護して
おくことが好ましい。The thickness of the pressure-sensitive adhesive layer can be appropriately determined according to the adhesive strength and the like, and is generally 1 to 500 μm. The adhesive layer may be provided on the outer surface of a polarizing plate or an optical member, if necessary, for the purpose of bonding to an adherend such as a liquid crystal cell. When such an adhesive layer is exposed on the surface, it is preferable to cover and protect the surface with a separator or the like until practical use.
【００３３】なお粘着層は、必要に応じて例えば天然物
や合成物の樹脂類、就中、粘着性付与樹脂、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
を含有していてもよい。また微粒子を含有して光拡散性
を示す粘着層であってもよい。The pressure-sensitive adhesive layer may be, if necessary, a filler or a pigment made of, for example, a natural or synthetic resin, especially a tackifying resin, glass fiber or glass beads, metal powder or other inorganic powder. And appropriate additives such as a coloring agent and an antioxidant. Further, the pressure-sensitive adhesive layer may contain fine particles and exhibit light diffusion.
【００３４】また偏光板や光学部材の形成に供する偏光
フィルムや透明薄膜層、保護層や位相差板等の光学層及
び粘着層等の接着層は、必要に応じて例えばサリチル酸
エステル系化合物やベンゾフェノール系化合物、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
などの適宜な方式により紫外線吸収能をもたせることも
できる。The polarizing film and the transparent thin film layer used for forming the polarizing plate and the optical member, the optical layer such as the protective layer and the retardation plate, and the adhesive layer such as the adhesive layer may be formed of a salicylic acid ester compound or Phenolic compounds, benzotriazole compounds and cyanoacrylate compounds,
The ultraviolet absorbing ability can be provided by an appropriate method such as a method of treating with an ultraviolet absorbent such as a nickel complex compound.
【００３５】本発明による偏光板や光学部材は、透過型
や反射型、あるいは透過反射両用型の液晶表示装置の形
成などの従来に準じた各種の用途に好ましく用いうる。
ちなみに図３、図４に本発明による光学部材を液晶セル
に配置してなる液晶表示装置を例示した。図３は透過型
の液晶表示装置を、図４は反射型の液晶表示装置を示し
ており、６が液晶セル、７がバックライト、８が光拡散
層、９が反射層である。なお６１は接着層である。The polarizing plate and the optical member according to the present invention can be preferably used for various conventional applications such as formation of a transmission type, a reflection type, or a transmission / reflection type liquid crystal display device.
3 and 4 illustrate a liquid crystal display device in which the optical member according to the present invention is arranged in a liquid crystal cell. FIG. 3 shows a transmission type liquid crystal display device, and FIG. 4 shows a reflection type liquid crystal display device. 6 is a liquid crystal cell, 7 is a backlight, 8 is a light diffusion layer, and 9 is a reflection layer. Reference numeral 61 denotes an adhesive layer.
【００３６】図例の如く光学部材は、液晶セルの片側又
は両側に配置することができる。用いる液晶セルは任意
であり、例えば薄膜トランジスタ型に代表されるアクテ
ィブマトリクス駆動型のもの、ツイストネマチック型や
スーパーツイストネマチック型に代表される単純マトリ
クス駆動型のものなどの適宜なタイプの液晶セルを使用
して種々の液晶表示装置を形成することができる。As shown in the drawing, the optical members can be arranged on one side or both sides of the liquid crystal cell. The liquid crystal cell to be used is optional, and for example, an appropriate type of liquid crystal cell such as an active matrix driving type represented by a thin film transistor type, a simple matrix driving type represented by a twisted nematic type or a super twisted nematic type is used. Thus, various liquid crystal display devices can be formed.
【００３７】液晶セルの両側に設ける光学部材は、同じ
ものであってもよいし、異なるものであってもよい。な
お透過反射両用型の液晶表示装置は、例えば図４におけ
る反射層９を半透過型のものに変更して、その反液晶セ
ル側にバックライト７を配置する方式などにより得るこ
とができる。The optical members provided on both sides of the liquid crystal cell may be the same or different. The transflective liquid crystal display device can be obtained by, for example, changing the reflective layer 9 in FIG. 4 to a transflective type and disposing the backlight 7 on the side opposite to the liquid crystal cell.
【００３８】[0038]
【実施例】例１ アクリル系樹脂の４０重量％トルエン溶液をワイヤバー
にて塗工し、６０℃で乾燥処理する方式にて、ポリビニ
ルアルコールフィルムにヨウ素を吸着させて延伸処理し
てなる厚さ３０μmの偏光フィルムの両面に厚さ０．２
μmの透明薄膜層を設けて偏光板を得た。EXAMPLE 1 A 30 wt.% Thick film formed by applying a 40 wt% toluene solution of an acrylic resin with a wire bar and drying at 60.degree. C. by adsorbing iodine on a polyvinyl alcohol film and stretching. 0.2 thickness on both sides of the polarizing film
A polarizing plate was obtained by providing a μm transparent thin film layer.
【００３９】例２ 透明薄膜層の厚さを０．３μmとしたほかは実施例１に
準じて偏光板を得た。Example 2 A polarizing plate was obtained in the same manner as in Example 1 except that the thickness of the transparent thin film layer was changed to 0.3 μm.
【００４０】例３ 透明薄膜層の厚さを１．８μmとしたほかは実施例１に
準じて偏光板を得た。Example 3 A polarizing plate was obtained in the same manner as in Example 1 except that the thickness of the transparent thin film layer was changed to 1.8 μm.
【００４１】例４ 透明薄膜層の厚さを１５μmとしたほかは実施例１に準
じて偏光板を得た。Example 4 A polarizing plate was obtained in the same manner as in Example 1 except that the thickness of the transparent thin film layer was changed to 15 μm.
【００４２】例５ 透明薄膜層の厚さを２０μmとしたほかは実施例１に準
じて偏光板を得た。Example 5 A polarizing plate was obtained in the same manner as in Example 1 except that the thickness of the transparent thin film layer was changed to 20 μm.
【００４３】例６ 透明薄膜層を設けずに実施例１に準じた偏光フィルムを
そのまま偏光板として用いた。Example 6 A polarizing film according to Example 1 was directly used as a polarizing plate without providing a transparent thin film layer.
【００４４】評価試験 切断加工性 実施例、比較例で得た偏光板を３００mm角のサイズに切
断した。その場合、例５の偏光板ではその切断面に亀裂
が発生し、その部分で偏光機能に乱れが生じて実用でき
ないものとなった。Evaluation Test Cutting Processability The polarizing plates obtained in Examples and Comparative Examples were cut into a size of 300 mm square. In that case, in the polarizing plate of Example 5, a crack was generated on the cut surface, and the polarizing function was disturbed at that portion, making it unpractical.
【００４５】耐久性、取扱性 ３００mm角のサイズに切断した例１〜４，６の偏光板を
アクリル系粘着層を介してガラス板に接着し、それを６
０℃、９０％ＲＨの加熱加湿雰囲気下に５時間放置した
後取り出し、その試験の前後における光透過率Ｂ及び形
状の変化を調べ、また前記の接着作業時や加熱加湿試験
時における偏光板の取扱性を調べた。その結果を次表に
示した。なお表には、４０℃、９２％ＲＨ、５時間の条
件による加湿試験での光透過率Ａの変化も示した。Durability and handleability The polarizing plates of Examples 1 to 4 and 6 cut into a size of 300 mm square were adhered to a glass plate via an acrylic adhesive layer, and
After leaving for 5 hours in a heating and humidifying atmosphere at 0 ° C. and 90% RH, the sample was taken out and examined for changes in light transmittance B and shape before and after the test. The handling was examined. The results are shown in the following table. The table also shows changes in the light transmittance A in the humidification test under the conditions of 40 ° C., 92% RH, and 5 hours.
【００４６】 ＊：偏光板の周辺部で若干の偏光機能の喪失[0046] *: Slight loss of polarization function around the polarizer
【図１】偏光板例の断面図FIG. 1 is a cross-sectional view of a polarizing plate example.
【図２】光学部材例の断面図FIG. 2 is a cross-sectional view of an example of an optical member.
【図３】液晶表示装置例の断面図FIG. 3 is a cross-sectional view of an example of a liquid crystal display device.
【図４】他の液晶表示装置例の断面図FIG. 4 is a cross-sectional view of another example of a liquid crystal display device.
【符号の説明】 １、３：透明薄膜層 ２：偏光フィルム ４，６１：接着層 ５：光学層（位相差板） ６：液晶セル ７：バックライト ８：光拡散層 ９：反射層[Description of Signs] 1, 3: Transparent thin film layer 2: Polarizing film 4, 61: Adhesive layer 5: Optical layer (retardation plate) 6: Liquid crystal cell 7: Backlight 8: Light diffusing layer 9: Reflective layer
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2H042 AA04 AA26 2H049 BA02 BA06 BA22 BA25 BA27 BB11 BB16 BB23 BB27 BB28 BB33 BB43 BB62 BC03 2H091 FA08X FA08Z FA11X FA11Z FA14Z FA15Z FA31X FA31Z FB02 FB08 FC01 FC02 FC03 FD06 GA16 GA17 LA11 LA12 LA19 2K009 AA15 BB12 CC24 CC34 CC38 DD02 EE00 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H042 AA04 AA26 2H049 BA02 BA06 BA22 BA25 BA27 BB11 BB16 BB23 BB27 BB28 BB33 BB43 BB62 BC03 2H091 FA08X FA08Z FA11X FA11Z FA14Z FA15Z FA31X FA31Z11 FC02 LA17 FC03 2K009 AA15 BB12 CC24 CC34 CC38 DD02 EE00
Claims (6)
面又は両面に、そのフィルムを溶解しない溶剤による樹
脂溶液を塗工し乾燥させて、透明薄膜層を設けることを
特徴とする偏光板の製造方法。1. A method for producing a polarizing plate, wherein a transparent thin film layer is provided on one or both sides of a polarizing film made of a hydrophilic polymer by applying a resin solution with a solvent that does not dissolve the film and drying the solution. Method.
ース系樹脂、ポリカーボネート系樹脂、ポリエステル系
樹脂又はアクリル系樹脂からなる厚さ０．３〜１５μm
のものである製造方法。2. The method according to claim 1, wherein the transparent thin film layer is made of a cellulose resin, a polycarbonate resin, a polyester resin or an acrylic resin, and has a thickness of 0.3 to 15 μm.
Manufacturing method.
面又は両面に、樹脂塗工膜からなる透明薄膜層を有し、
かつその透明薄膜層の上に透明フィルムからなる保護層
を有することを特徴とする偏光板。3. A polarizing film made of a hydrophilic polymer has a transparent thin film layer made of a resin coating film on one or both surfaces thereof,
A polarizing plate comprising a protective layer made of a transparent film on the transparent thin film layer.
る、又は請求項３に記載の偏光板と他の光学機能を示す
光学層との積層体からなることを特徴とする光学部材。4. An optical member comprising a laminate of the polarizing plate according to claim 1 or 2 and an optical layer having another optical function.
ある光学部材。5. The optical member according to claim 4, wherein the optical layer is a retardation plate.
セルの片側又は両側に配置してなることを特徴とする液
晶表示装置。6. A liquid crystal display device comprising the optical member according to claim 4 arranged on one or both sides of a liquid crystal cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10377482A JP2000199819A (en) | 1998-12-28 | 1998-12-28 | Polarizing plate, its manufacture, optical member and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10377482A JP2000199819A (en) | 1998-12-28 | 1998-12-28 | Polarizing plate, its manufacture, optical member and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000199819A true JP2000199819A (en) | 2000-07-18 |
Family
ID=18508885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10377482A Pending JP2000199819A (en) | 1998-12-28 | 1998-12-28 | Polarizing plate, its manufacture, optical member and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000199819A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005043858A (en) * | 2003-03-31 | 2005-02-17 | Sumitomo Chemical Co Ltd | Polarizing plate and manufacturing method therefor |
| US6961178B2 (en) | 2001-04-06 | 2005-11-01 | Nitto Denko Corporation | Polarizing film, optical film and liquid crystal display using polarizing film |
| US7008504B2 (en) | 2001-04-06 | 2006-03-07 | Nitto Denko Corporation | Manufacturing method of polarizing film, polarizing film, optical film, and visual display |
| WO2007075566A2 (en) * | 2005-12-19 | 2007-07-05 | Eastman Kodak Company | Method of making a polarizer plate |
| JP2009520243A (en) * | 2005-12-19 | 2009-05-21 | イーストマン コダック カンパニー | How to make a polarizer plate |
| JP2010066484A (en) * | 2008-09-10 | 2010-03-25 | Sumitomo Chemical Co Ltd | Polarizing plate, method for manufacturing the same, optical member and liquid crystal display device |
| KR20100138902A (en) | 2008-02-04 | 2010-12-31 | 스미또모 가가꾸 가부시키가이샤 | Polarizing plate, optical member, and liquid crystal display device |
| WO2014199934A1 (en) * | 2013-06-10 | 2014-12-18 | 富士フイルム株式会社 | Polarizing plate, method for producing polarizing plate, transfer material for production of polarizing plate, and transfer material |
| KR20170032188A (en) | 2015-09-14 | 2017-03-22 | 스미또모 가가꾸 가부시키가이샤 | Method for producing laminated optical film |
| US9638850B2 (en) | 2003-02-12 | 2017-05-02 | Sumitomo Chemical Company, Limited | Polarizer, process for preparing the same, optical member and liquid crystal displaying apparatus |
| KR20210046587A (en) | 2018-08-23 | 2021-04-28 | 닛토덴코 가부시키가이샤 | Polarizer, polarizing film, optical film, and image display device |
| KR20210046586A (en) | 2018-08-23 | 2021-04-28 | 닛토덴코 가부시키가이샤 | Polarizer, polarizing film, optical film, and image display device |
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-
1998
- 1998-12-28 JP JP10377482A patent/JP2000199819A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6961178B2 (en) | 2001-04-06 | 2005-11-01 | Nitto Denko Corporation | Polarizing film, optical film and liquid crystal display using polarizing film |
| US7008504B2 (en) | 2001-04-06 | 2006-03-07 | Nitto Denko Corporation | Manufacturing method of polarizing film, polarizing film, optical film, and visual display |
| US9638850B2 (en) | 2003-02-12 | 2017-05-02 | Sumitomo Chemical Company, Limited | Polarizer, process for preparing the same, optical member and liquid crystal displaying apparatus |
| JP2005043858A (en) * | 2003-03-31 | 2005-02-17 | Sumitomo Chemical Co Ltd | Polarizing plate and manufacturing method therefor |
| JP4525069B2 (en) * | 2003-03-31 | 2010-08-18 | 住友化学株式会社 | Polarizing plate and manufacturing method thereof |
| US7732007B2 (en) | 2005-12-19 | 2010-06-08 | Eastman Kodak Company | Method of making a polarizer plate |
| JP2009520243A (en) * | 2005-12-19 | 2009-05-21 | イーストマン コダック カンパニー | How to make a polarizer plate |
| JP2009520244A (en) * | 2005-12-19 | 2009-05-21 | イーストマン コダック カンパニー | How to make a polarizer plate |
| WO2007075566A3 (en) * | 2005-12-19 | 2007-08-16 | Eastman Kodak Co | Method of making a polarizer plate |
| WO2007075566A2 (en) * | 2005-12-19 | 2007-07-05 | Eastman Kodak Company | Method of making a polarizer plate |
| KR20100138902A (en) | 2008-02-04 | 2010-12-31 | 스미또모 가가꾸 가부시키가이샤 | Polarizing plate, optical member, and liquid crystal display device |
| KR20150143866A (en) | 2008-02-04 | 2015-12-23 | 스미또모 가가꾸 가부시키가이샤 | Polarizing plate, optical member, and liquid crystal display device |
| JP2010066484A (en) * | 2008-09-10 | 2010-03-25 | Sumitomo Chemical Co Ltd | Polarizing plate, method for manufacturing the same, optical member and liquid crystal display device |
| WO2014199934A1 (en) * | 2013-06-10 | 2014-12-18 | 富士フイルム株式会社 | Polarizing plate, method for producing polarizing plate, transfer material for production of polarizing plate, and transfer material |
| KR20170032188A (en) | 2015-09-14 | 2017-03-22 | 스미또모 가가꾸 가부시키가이샤 | Method for producing laminated optical film |
| KR20210046587A (en) | 2018-08-23 | 2021-04-28 | 닛토덴코 가부시키가이샤 | Polarizer, polarizing film, optical film, and image display device |
| KR20210046586A (en) | 2018-08-23 | 2021-04-28 | 닛토덴코 가부시키가이샤 | Polarizer, polarizing film, optical film, and image display device |
| KR20210047272A (en) | 2018-08-23 | 2021-04-29 | 닛토덴코 가부시키가이샤 | Polarizer, polarizing film, optical film, and image display device |
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