JP2000258631A - Wide visual field angle polarizing plate and liquid crystal display device - Google Patents
Wide visual field angle polarizing plate and liquid crystal display deviceInfo
- Publication number
- JP2000258631A JP2000258631A JP11062800A JP6280099A JP2000258631A JP 2000258631 A JP2000258631 A JP 2000258631A JP 11062800 A JP11062800 A JP 11062800A JP 6280099 A JP6280099 A JP 6280099A JP 2000258631 A JP2000258631 A JP 2000258631A
- Authority
- JP
- Japan
- Prior art keywords
- polarizing plate
- liquid crystal
- optical compensation
- display device
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- Liquid Crystal (AREA)
- Polarising Elements (AREA)
Abstract
Description
【０００１】[0001]
【発明の技術分野】本発明は、広い視角範囲で良好な視
認性を示す液晶表示装置を形成しうる形状安定性に優れ
る広視野角偏光板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wide viewing angle polarizing plate having excellent shape stability and capable of forming a liquid crystal display device exhibiting good visibility over a wide viewing angle range.
【０００２】[0002]
【発明の背景】従来、光学補償層を三酢酸セルロースフ
ィルムにて支持してなる光学補償位相差板と偏光板の積
層体からなる広視野角偏光板が知られていた。これに
は、それを液晶セルに適用して広い視野角で良好な視認
性を示す液晶表示装置を形成することが期待されてい
る。しかしながら、かかる広視野角偏光板を保管する内
にカールが発生し、液晶セルに適用する際にはそのカー
ル変形で歩留まりが大きく低下する問題点があった。カ
ール変形は、面積が大きくなるほど著しくなる。BACKGROUND OF THE INVENTION Hitherto, there has been known a wide viewing angle polarizing plate comprising a laminate of an optical compensation retardation plate having an optical compensation layer supported by a cellulose triacetate film and a polarizing plate. This is expected to be applied to a liquid crystal cell to form a liquid crystal display device exhibiting good visibility over a wide viewing angle. However, there is a problem that curl occurs during storage of such a wide viewing angle polarizing plate, and when applied to a liquid crystal cell, the yield is greatly reduced due to the curl deformation. The curl deformation increases as the area increases.
【０００３】[0003]
【発明の技術的課題】本発明は、広い視野角で良好な視
認性を示す液晶表示装置を形成できてカール変形を生じ
にくい大面積の広視野角偏光板を得ることを課題とす
る。SUMMARY OF THE INVENTION It is an object of the present invention to provide a large-area wide-viewing-angle polarizing plate which can form a liquid crystal display device exhibiting good visibility at a wide viewing angle and is less likely to cause curl deformation.
【０００４】[0004]
【課題の解決手段】本発明は、三酢酸セルロースフィル
ムからなる光学補償位相差板又は光学補償層を三酢酸セ
ルロースフィルムにて支持してなる光学補償位相差板と
偏光板の積層体からなり、その光学補償位相差板の水分
率が０．９〜２．０％であることを特徴とする広視野角
偏光板、及びその広視野角偏光板を液晶セルの少なくと
も片側に有することを特徴とする液晶表示装置を提供す
るものである。According to the present invention, there is provided an optically-compensatory retardation plate or an optically-compensatory retardation plate comprising a cellulose triacetate film and an optically-compensatory retardation plate and / or a polarizing plate laminated on the cellulose triacetate film. A wide viewing angle polarizing plate, wherein the moisture content of the optical compensation retardation plate is 0.9 to 2.0%; and a wide viewing angle polarizing plate provided on at least one side of a liquid crystal cell. To provide a liquid crystal display device.
【０００５】[0005]
【発明の効果】本発明によれば、大面積体の場合にもカ
ール変形を生じにくい広視野角偏光板を得ることがで
き、それを用いて広い視野角で良好な視認性を示す液晶
表示装置を歩留まりよく形成することができる。これ
は、前記した光学補償位相差板の水分率を制御したこと
による。According to the present invention, it is possible to obtain a wide-viewing-angle polarizing plate which does not easily undergo curl deformation even in the case of a large-area body, and a liquid crystal display exhibiting good visibility at a wide viewing angle using the polarizing plate. The device can be formed with high yield. This is due to the control of the water content of the optical compensation phase difference plate.
【０００６】すなわち本発明者らは、上記したカール問
題を克服するために鋭意研究を重ねる中で、カールの発
生は光学補償位相差板を形成する三酢酸セルロースフィ
ルムが吸水により膨潤したり、水分の蒸発により収縮し
たりして寸法変化することが原因であることを究明し、
その水分率を前記範囲に制御することにより水分の作用
による寸法変化の抑制に成功した。In other words, the present inventors have conducted intensive studies to overcome the above-mentioned curl problem. As a result, the curl is generated by swelling of the cellulose triacetate film forming the optical compensation retardation plate due to water absorption or moisture. Investigating that it is caused by shrinking or dimensional change due to evaporation of
By controlling the moisture content in the above range, the dimensional change due to the action of moisture was successfully suppressed.
【０００７】[0007]
【発明の実施形態】本発明による広視野角偏光板は、三
酢酸セルロースフィルムからなる光学補償位相差板又は
光学補償層を三酢酸セルロースフィルムにて支持してな
る光学補償位相差板と偏光板の積層体からなり、その光
学補償位相差板が水分率０．９〜２．０％のものからな
る。その例を図１に示した。５が広視野角偏光板であ
り、１が偏光板、２、４が粘着層、３が光学補償位相差
板である。また５１は、粘着層４を仮着保護する必要に
応じてのセパレータである。BEST MODE FOR CARRYING OUT THE INVENTION A wide viewing angle polarizing plate according to the present invention comprises an optically compensating retardation plate comprising a cellulose triacetate film or an optically compensating retardation plate comprising an optical compensation layer supported by a cellulose triacetate film and a polarizing plate. Wherein the optical compensation retardation plate has a moisture content of 0.9 to 2.0%. An example is shown in FIG. 5 is a wide viewing angle polarizing plate, 1 is a polarizing plate, 2 and 4 are adhesive layers, and 3 is an optical compensation retardation plate. Reference numeral 51 denotes a separator as needed to temporarily protect the adhesive layer 4.
【０００８】偏光板１としては、適宜なものを用いるこ
とができ、その種類について特に限定はない。ちなみに
その例としては、ポリビニルアルコール系フィルムや部
分ホルマール化ポリビニルアルコール系フィルム、エチ
レン・酢酸ビニル共重合体系部分ケン化フィルムやセル
ロース系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などからなる偏光
フィルムがあげられる。偏光フィルムの厚さは通例５〜
８０μmであるが、これに限定されない。As the polarizing plate 1, an appropriate one can be used, and there is no particular limitation on the type. Incidentally, examples thereof include iodine and / or a dichroic dye on 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 cellulose-based film. And a polarizing film composed of a polyene oriented film such as a dehydrated polyvinyl alcohol product or a dehydrochlorinated polyvinyl chloride product. The thickness of the polarizing film is usually 5
80 μm, but not limited to this.
【０００９】偏光板は、偏光フィルムそのものであって
もよいし、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、フィル
ムのラミネート方式や塗工方式などの適宜な方式で形成
でき、その形成には適宜な透明樹脂などを用いうる。The polarizing plate may be a polarizing film itself or a polarizing film provided with a transparent protective layer on one or both sides of the polarizing film. The transparent protective layer can be formed by an appropriate method such as a film laminating method or a coating method, and an appropriate transparent resin or the like can be used for the formation.
【００１０】好ましい透明保護層は、透明性や機械的強
度、熱安定性や水分遮蔽性、等方性などに優れるもので
ある。その例としては、三酢酸セルロースの如きセルロ
ース系樹脂やポリエステル、ポリカーボネートやポリア
ミド、ポリイミドやポリエーテルスルホン、ポリスルホ
ンやポリスチレン、アクリル系樹脂やポリオレフィン等
のプラスチック、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
し紫外線硬化型樹脂などがあげられる。The preferred transparent protective layer is excellent in transparency, mechanical strength, heat stability, moisture shielding property, isotropy, and the like. Examples thereof include cellulosic resins such as cellulose triacetate, polyesters, polycarbonates and polyamides, polyimides and polyethersulfones, polysulfones and polystyrenes, plastics such as acrylic resins and polyolefins, acrylics and urethanes, acrylic urethanes and epoxies. And thermosetting or ultraviolet curable resins such as silicone and silicone.
【００１１】一方、光学補償位相差板３としては、液晶
セルによる位相差に基づく視認角の変化による着色等の
防止や良視認の視野角の拡大などを目的とした三酢酸セ
ルロースフィルムの一軸や二軸等による延伸処理物、又
は光学補償層を三酢酸セルロースフィルムにて支持して
なるもの、就中、液晶ポリマー等の配向層、特にディス
コティック液晶ポリマーの傾斜配向層からなる光学補償
層を三酢酸セルロースフィルムにて支持してなる光学補
償位相差板が用いられる。On the other hand, as the optical compensation retardation plate 3, a uniaxial cellulose triacetate film for the purpose of preventing coloring due to a change in the viewing angle based on the phase difference of the liquid crystal cell, or enlarging the viewing angle for good visibility, etc. A biaxially stretched product, or an optical compensation layer supported by a cellulose triacetate film, particularly an alignment layer such as a liquid crystal polymer, particularly an optical compensation layer composed of a tilted alignment layer of a discotic liquid crystal polymer. An optical compensation retardation plate supported by a cellulose triacetate film is used.
【００１２】本発明において用いる光学補償位相差板
は、水分率を０．９〜２．０％に調節したものである。
その水分率が０．９％未満では光学補償位相差板、特に
その三酢酸セルロースフィルムが吸水により膨潤してカ
ールを生じるし、水分率が２．０％を超えると水分が蒸
発して収縮し、前記とは反対の方向にカールする。The optical compensation phase difference plate used in the present invention has a water content adjusted to 0.9 to 2.0%.
If the water content is less than 0.9%, the optically compensating retardation film, particularly the cellulose triacetate film, swells due to water absorption to cause curl. If the water content exceeds 2.0%, the water evaporates and shrinks. Curl in the opposite direction.
【００１３】カール防止の点より光学補償位相差板の好
ましい水分率は、１．９％以下、就中１．８％以下、特
に１．０〜１．７％である。なお光学補償位相差板にお
ける水分率の制御は、例えば加湿雰囲気や乾燥雰囲気に
て調湿処理する方式などの適宜な方式にて行うことがで
きる。その場合、雰囲気温度は２０〜２５度とすること
が処理中や処理後の変形防止等の点より好ましい。The preferred moisture content of the optical compensation retarder is 1.9% or less, particularly 1.8% or less, particularly 1.0 to 1.7% from the viewpoint of preventing curling. The moisture content of the optical compensation retardation plate can be controlled by an appropriate method such as a method of controlling the humidity in a humidified atmosphere or a dry atmosphere. In this case, it is preferable to set the ambient temperature to 20 to 25 degrees from the viewpoint of preventing deformation during and after processing.
【００１４】偏光板１と光学補償位相差板３は、適宜な
方式で接着してそれらの積層体からなる広視野角偏光板
５とすることができる。接着処理の簡便性や実用時にお
ける光学特性の安定維持性などの点よりは、粘着層２に
よる接着処理が好ましい。その粘着層の形成には、例え
ばアクリル系やシリコーン系、ポリエステル系やポリウ
レタン系、ポリアミド系やポリエーテル系、ゴム系など
の適宜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
が好ましく用いうる。The polarizing plate 1 and the optically compensating retardation plate 3 can be bonded together by an appropriate method to form a wide-viewing-angle polarizing plate 5 composed of a laminate thereof. Adhesion treatment with the adhesive layer 2 is preferred from the viewpoint of simplicity of adhesion treatment and stability of maintaining optical characteristics in practical use. For forming the adhesive layer, for example, an appropriate adhesive such as acrylic, silicone, polyester, polyurethane, polyamide, polyether, or rubber can be used. Above all, an acrylic pressure-sensitive adhesive can be preferably used in terms of optical transparency, pressure-sensitive adhesive properties, weather resistance and the like.
【００１５】偏光板又は／及び光学補償位相差板への粘
着層２の付設は、例えば粘着剤の溶液ないし溶融液を流
延方式や塗工方式等の適宜な展開方式で偏光板又は／及
び光学補償位相差板の所定面に直接付設する方式、ある
いはそれに準じセパレータ上に粘着層を形成してそれを
偏光板又は／及び光学補償位相差板の所定面に移着する
方式などの適宜な方式で行うことができる。粘着層の厚
さは、接着力などに応じて適宜に決定でき、一般には１
〜５００μm、就中５〜２００μm、特に１０〜１００μ
mとされる。The attachment of the pressure-sensitive adhesive layer 2 to the polarizing plate and / or the optically compensating retardation plate can be performed, for example, by applying a solution or a melt of the pressure-sensitive adhesive by a suitable developing method such as a casting method or a coating method. Appropriate methods such as a method of directly attaching to a predetermined surface of an optical compensation retardation plate or a method of forming an adhesive layer on a separator and transferring it to a predetermined surface of a polarizing plate and / or an optical compensation retardation plate according to the method. It can be done in a manner. The thickness of the pressure-sensitive adhesive layer can be appropriately determined according to the adhesive strength and the like.
~ 500 μm, especially 5-200 μm, especially 10-100 μm
m.
【００１６】広視野角偏光板には、図例の如くそれを液
晶セル等に接着固定するための粘着層４を必要に応じ設
けることができる。その粘着層は通例、広視野角偏光板
の光学補償位相差板上に設けられる。かかる粘着層の形
成や付設は、上記した粘着層２に準じて行うことがで
き、その付設については予め光学補償位相差板に設けて
それを広視野角偏光板の形成に供することもできる。The wide-viewing-angle polarizing plate can be provided with an adhesive layer 4 for adhering and fixing it to a liquid crystal cell or the like as required, as shown in the figure. The adhesive layer is usually provided on an optical compensation retardation plate of a wide viewing angle polarizing plate. The formation and attachment of such an adhesive layer can be performed in accordance with the above-mentioned adhesive layer 2, and the attachment can be provided in advance on an optical compensation retardation plate and used for forming a wide viewing angle polarizing plate.
【００１７】なお前記の粘着層４に対しては、図１に例
示の如くそれを接着に供するまでの間、汚染等による接
着力低下の防止などを目的に必要に応じセパレータ５１
等を仮着するなどしてカバーされる。そのセパレータと
しては、例えばプラスチックフィルムやゴムシート、紙
や布、不織布やネット、発泡シートや金属箔、それらの
ラミネート体等の適宜な薄葉体を、必要に応じシリコー
ン系や長鎖アルキル系やフッ素系等の適宜な剥離剤でコ
ート処理したものなどの、従来に準じた適宜なものを用
いうる。As shown in FIG. 1, the adhesive layer 4 may have a separator 51 if necessary for the purpose of preventing a decrease in adhesive strength due to contamination or the like until the adhesive layer 4 is bonded.
Is covered by temporarily wearing the like. As the separator, for example, an appropriate thin body such as a plastic film or a rubber sheet, paper or cloth, a nonwoven fabric or a net, a foamed sheet or a metal foil, or a laminate thereof may be used. An appropriate one according to the related art, such as one coated with an appropriate release agent such as a system, may be used.
【００１８】なお広視野角偏光板を形成する偏光板や透
明保護層、光学補償位相差板や接着層ないし粘着層など
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により紫外線吸
収能をもたせたものであってもよい。If necessary, the polarizing plate, the transparent protective layer, the optically compensating retardation plate, the adhesive layer or the adhesive layer, etc. forming the wide viewing angle polarizing plate may be formed of, for example, a salicylate compound, a benzophenol compound, a benzotriazole. UV-absorbing ability may be provided by a method of treating with a UV-absorbing agent such as a system-based compound, a cyanoacrylate-based compound, and a nickel complex-based compound.
【００１９】本発明による広視野角偏光板は、品質のバ
ラツキ防止や液晶表示装置の組立効率の向上などを目的
に偏光板と光学補償位相差板を予め積層して広視野角偏
光板としたものであり、液晶表示装置の形成などに好ま
しく用いうる。なお前記の偏光板と光学補償位相差板の
積層に際し、それらの光学軸は目的とする位相差特性な
どに応じて適宜な配置角度とすることができる。The wide viewing angle polarizing plate according to the present invention is obtained by laminating a polarizing plate and an optical compensation retardation plate in advance for the purpose of preventing variation in quality and improving the assembling efficiency of a liquid crystal display device. And can be preferably used for forming a liquid crystal display device and the like. When laminating the polarizing plate and the optical compensation retardation plate, their optic axes can be set at an appropriate angle depending on the intended retardation characteristics and the like.
【００２０】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、液晶セルと偏光
板と光学補償位相差板、及び必要に応じての照明システ
ム等の構成部品を適宜に組立てて駆動回路を組込むこと
などにより形成されるが、本発明においては本発明によ
る広視野角偏光板を用い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 can be performed according to a conventional method. That is, a liquid crystal display device is generally formed by appropriately assembling components such as a liquid crystal cell, a polarizing plate, an optical compensation retardation plate, and an illumination system as required, and incorporating a driving circuit. In is not particularly limited except that the wide viewing angle polarizing plate according to the present invention is used,
It can be according to the conventional.
【００２１】従って、液晶セルの片側又は両側に偏光板
を配置した液晶表示装置や、照明システムにバックライ
トあるいは反射板を用いたものなどの適宜な液晶表示装
置を形成することができる。その場合、本発明による広
視野角偏光板は液晶セルの片側又は両側に設置すること
ができる。またかかる広視野角偏光板によれば、偏光板
と液晶セルの間に光学補償位相差板を配置できて補償効
果に優れており、その補償効果の点よりは液晶セルの少
なくとも視認側に広視野角偏光板を配置することが特に
好ましい。Therefore, it is possible to form a suitable liquid crystal display device such as a liquid crystal display device in which a polarizing plate is disposed on one or both sides of a liquid crystal cell, or a lighting system using a backlight or a reflection plate. In that case, the wide viewing angle polarizer according to the present invention can be installed on one side or both sides of the liquid crystal cell. According to such a wide-viewing-angle polarizing plate, an optically compensating retardation plate can be arranged between the polarizing plate and the liquid crystal cell, so that the polarizing plate has an excellent compensating effect. It is particularly preferable to arrange a viewing angle polarizing plate.
【００２２】図２、図３に前記した液晶表示装置の構成
例を示した。５が広視野角偏光板、６が液晶セル、７が
バックライトシステム、９が反射層である。なお８は光
拡散板である。図２のものは液晶セル６の両側に広視野
角偏光板５を配置してなるバックライト式照明型のもの
であり、図３のものは液晶セルの片側にのみ広視野角偏
光板を配置してなる反射式照明型のものである。FIGS. 2 and 3 show examples of the structure of the liquid crystal display device described above. 5 is a wide viewing angle polarizing plate, 6 is a liquid crystal cell, 7 is a backlight system, and 9 is a reflective layer. Reference numeral 8 denotes a light diffusion plate. FIG. 2 shows a backlight-type illumination type in which a wide viewing angle polarizing plate 5 is arranged on both sides of a liquid crystal cell 6, and FIG. 3 shows a wide viewing angle polarizing plate arranged only on one side of the liquid crystal cell. This is a reflection type illumination type.
【００２３】なお液晶セルについても、例えばＴＮ型や
ＳＴＮ型、π型などの任意なタイプのものを用いうる。
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、反射防止膜や保護板などの適宜な光学層
を適宜な位置に１層又は２層以上を配置することができ
る。The liquid crystal cell may be of any type such as TN type, STN type, and π type.
In forming a liquid crystal display device, one or two or more appropriate optical layers such as a diffusion plate, an antiglare layer, an antireflection film and a protective plate can be arranged at appropriate positions.
【００２４】[0024]
【実施例】実施例１ 厚さ８０μmのポリビニルアルコールフィルムをヨウ素
水溶液中にて５倍に延伸処理して得た偏光フィルムの両
側にポリビニルアルコール系接着層を介し三酢酸セルロ
ースフィルムを接着した後、その片面に厚さ２５μmの
アクリル系粘着層を付設して偏光板を得た。この偏光板
の水分率を調べたところ２．８０％であった。なお水分
率は、カールフィッシャー法を採用した電量滴定式水分
測定装置（三菱化学社製、ＣＡ−０６型）と加熱気化装
置（三菱化学社製、ＶＡ−０６型）を用い、５〜３０mg
のサンプルを１５０℃とした加熱気化装置にて加熱し、
その加熱直後から滴定を開始して、その開始時のバック
グラウンド値に０．１μｇ／secを加えた電解速度を終
点として測定した（以下同じ）。EXAMPLE 1 A cellulose triacetate film was adhered to both sides of a polarizing film obtained by stretching a polyvinyl alcohol film having a thickness of 80 μm 5 times in an aqueous iodine solution through a polyvinyl alcohol-based adhesive layer. An acrylic pressure-sensitive adhesive layer having a thickness of 25 μm was provided on one surface of the polarizing plate to obtain a polarizing plate. The water content of this polarizing plate was determined to be 2.80%. The moisture content was 5 to 30 mg using a coulometric titration-type moisture measuring device (manufactured by Mitsubishi Chemical Corporation, model CA-06) employing a Karl Fischer method and a heating vaporizer (model VA-06, manufactured by Mitsubishi Chemical Corporation).
The sample was heated in a heating vaporizer at 150 ° C.
The titration was started immediately after the heating, and the measurement was performed with the electrolysis rate obtained by adding 0.1 μg / sec to the background value at the start as the end point (the same applies hereinafter).
【００２５】次に前記の偏光板に設けたアクリル系粘着
層を介し光学補償位相差板と接着して、広視野角偏光板
を得た。なお用いた光学補償位相差板は、ディスコティ
ック液晶ポリマーを傾斜配向させてなる光学補償層を三
酢酸セルロースフィルムにて支持したものであり（富士
写真フィルム社製、ＷＶ Ａ０２Ａ）、それを２３℃、
６０％ＲＨの雰囲気で６０時間調湿して水分率を１．１
％としたものである。Next, the polarizing plate was bonded to an optical compensation retardation plate via an acrylic adhesive layer provided on the polarizing plate to obtain a wide viewing angle polarizing plate. The optical compensation retarder used was one in which an optical compensation layer formed by tilting a discotic liquid crystal polymer was supported by a cellulose triacetate film (Fuji Photo Film Co., Ltd., WV A02A), which was heated at 23 ° C. ,
Controlling humidity in an atmosphere of 60% RH for 60 hours to reduce moisture content to 1.1
%.
【００２６】実施例２ 光学補償位相差板として、２３℃、８０％ＲＨの雰囲気
で６０時間調湿して水分率を１．６％としたものを用い
たほかは実施例１に準じて、広視野角偏光板を得た。Example 2 The same procedures as in Example 1 were carried out except that the optical compensation phase difference plate was adjusted to a moisture content of 1.6% by controlling the humidity in an atmosphere of 23 ° C. and 80% RH for 60 hours. A wide viewing angle polarizing plate was obtained.
【００２７】実施例３ 厚さ８０μmのポリビニルアルコールフィルムをヨウ素
水溶液中にて５倍に延伸処理して得た偏光フィルムの片
側にポリビニルアルコール系接着層を介し三酢酸セルロ
ースフィルムを接着して偏光板とした後、その偏光フィ
ルムの他面にポリビニルアルコール系接着層を介し三酢
酸セルロースの延伸フィルムからなる光学補償位相差板
を接着して、広視野角偏光板を得た。なお用いた光学補
償位相差板は、２３℃、６０％ＲＨの雰囲気で６０時間
調湿して水分率を１．１％としたものである。Example 3 A polarizing plate obtained by adhering a cellulose triacetate film through a polyvinyl alcohol-based adhesive layer to one side of a polarizing film obtained by stretching a polyvinyl alcohol film having a thickness of 80 μm by a factor of 5 in an aqueous iodine solution. After that, an optically compensating retardation plate made of a stretched film of cellulose triacetate was bonded to the other surface of the polarizing film via a polyvinyl alcohol-based adhesive layer to obtain a wide viewing angle polarizing plate. The optical compensation retardation plate used was obtained by controlling the humidity in an atmosphere of 23 ° C. and 60% RH for 60 hours so that the moisture content was 1.1%.
【００２８】比較例１ 光学補償位相差板として、２３℃、３０％ＲＨの雰囲気
で６０時間調湿して水分率を０．８０％としたものを用
いたほかは実施例１に準じて、広視野角偏光板を得た。Comparative Example 1 An optically compensating retardation plate was prepared in the same manner as in Example 1 except that the optical compensation phase difference plate was adjusted to a moisture content of 0.80% by controlling the humidity in an atmosphere of 23 ° C. and 30% RH for 60 hours. A wide viewing angle polarizing plate was obtained.
【００２９】比較例２ 光学補償位相差板として、２３℃、９０％ＲＨの雰囲気
で６０時間調湿して水分率を２．２％としたものを用い
たほかは実施例１に準じて、広視野角偏光板を得た。Comparative Example 2 The same procedure as in Example 1 was carried out except that the optical compensation phase difference plate was adjusted to a moisture content of 2.2% by controlling the humidity in an atmosphere of 23 ° C. and 90% RH for 60 hours. A wide viewing angle polarizing plate was obtained.
【００３０】評価試験 実施例、比較例で得た広視野角偏光板より２８０mm×２
２０mmサイズのサンプルを切り出し、それを室温で６５
時間放置したのちカールによる変形量を調べた。測定
は、図４の如く広視野角偏光板５を水平台上に置き、カ
ール量Ｈを測量することにより行った。Evaluation test 280 mm × 2 from the wide-viewing-angle polarizing plates obtained in Examples and Comparative Examples.
Cut out a sample of 20 mm size and squeeze it at room temperature for 65
After standing for a time, the amount of deformation due to curling was examined. The measurement was performed by placing the wide-viewing-angle polarizing plate 5 on a horizontal table as shown in FIG.
【００３１】前記の結果を次表に示した。なおカールの
方向により、光学補償位相差板が膨潤変形した場合を
＋、収縮した場合を−とした。 実施例１ 実施例２ 実施例３ 比較例１ 比較例２ カール量（mm） −５ ＋５ −５ ＋２５ −６０The results are shown in the following table. Note that, depending on the direction of the curl, the case where the optical compensation retardation plate swells and deforms is +, and the case where it contracts is-. Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Curling amount (mm) −5 +5 −5 +25 −60
【００３２】表より、光学補償位相差板の水分率を０．
９〜２．０％に制御することで、大面積体にてもカール
による変形を±１０mm以下に抑制できることがわかる。From the table, it is found that the moisture content of the optical compensation retardation plate is set to 0.1.
It can be seen that by controlling the content to 9 to 2.0%, the deformation due to curling can be suppressed to ± 10 mm or less even in a large-area body.
【図１】広視野角偏光板例の断面図FIG. 1 is a cross-sectional view of an example of a wide viewing angle polarizing plate.
【図２】液晶表示装置例の断面図FIG. 2 is a cross-sectional view of an example of a liquid crystal display device.
【図３】他の液晶表示装置例の断面図FIG. 3 is a cross-sectional view of another example of a liquid crystal display device.
【図４】カール量測定の説明図FIG. 4 is an explanatory diagram of curl amount measurement.
５：広視野角偏光板 １：偏光板 ２、４：粘着層 ３：光学補償位相差
板 ６：液晶セル5: Wide viewing angle polarizer 1: Polarizer 2, 4: Adhesive layer 3: Optical compensation retarder 6: Liquid crystal cell
フロントページの続き Ｆターム(参考） 2H049 BA02 BA06 BA25 BA27 BB03 BB43 BB49 BB51 BC22 2H091 FA08X FA08Z FA11X FA11Z FB02 FD10 FD14 LA19 LA30Continued on the front page F term (reference) 2H049 BA02 BA06 BA25 BA27 BB03 BB43 BB49 BB51 BC22 2H091 FA08X FA08Z FA11X FA11Z FB02 FD10 FD14 LA19 LA30
Claims (2)
補償位相差板又は光学補償層を三酢酸セルロースフィル
ムにて支持してなる光学補償位相差板と偏光板の積層体
からなり、その光学補償位相差板の水分率が０．９〜
２．０％であることを特徴とする広視野角偏光板。1. An optically-compensated retardation plate comprising a cellulose triacetate film or a laminate of an optically-compensated retardation plate having an optical compensation layer supported by a cellulose triacetate film and a polarizing plate; The water content of the board is 0.9 ~
A wide-viewing-angle polarizing plate, which is 2.0%.
セルの少なくとも片側に有することを特徴とする液晶表
示装置。2. A liquid crystal display device comprising the wide viewing angle polarizing plate according to claim 1 on at least one side of a liquid crystal cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11062800A JP2000258631A (en) | 1999-03-10 | 1999-03-10 | Wide visual field angle polarizing plate and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11062800A JP2000258631A (en) | 1999-03-10 | 1999-03-10 | Wide visual field angle polarizing plate and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000258631A true JP2000258631A (en) | 2000-09-22 |
Family
ID=13210791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11062800A Pending JP2000258631A (en) | 1999-03-10 | 1999-03-10 | Wide visual field angle polarizing plate and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000258631A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001046720A1 (en) * | 1999-12-22 | 2001-06-28 | Nippon Petrochemicals Co., Ltd. | Elliptical polarizing plate, method for producing the same, and liquid crystal display comprising the same |
| JP2005326531A (en) * | 2004-05-13 | 2005-11-24 | Nitto Denko Corp | Polarizing plate equipped with protecting film, manufacturing method therefor, and image display device using polarizing plate |
| KR100984660B1 (en) * | 2002-05-31 | 2010-10-01 | 스미또모 가가꾸 가부시끼가이샤 | The method for producing a laminated polarizing film |
| KR101514111B1 (en) | 2012-06-01 | 2015-04-23 | 주식회사 엘지화학 | Optical film having improved stability at a high temperature and a polarizing plate comprising the same |
| KR101521682B1 (en) * | 2012-06-01 | 2015-05-20 | 주식회사 엘지화학 | Optical film having improved storage stability at a low temperature and a polarizing plate comprising the same |
-
1999
- 1999-03-10 JP JP11062800A patent/JP2000258631A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001046720A1 (en) * | 1999-12-22 | 2001-06-28 | Nippon Petrochemicals Co., Ltd. | Elliptical polarizing plate, method for producing the same, and liquid crystal display comprising the same |
| KR100984660B1 (en) * | 2002-05-31 | 2010-10-01 | 스미또모 가가꾸 가부시끼가이샤 | The method for producing a laminated polarizing film |
| JP2005326531A (en) * | 2004-05-13 | 2005-11-24 | Nitto Denko Corp | Polarizing plate equipped with protecting film, manufacturing method therefor, and image display device using polarizing plate |
| KR101514111B1 (en) | 2012-06-01 | 2015-04-23 | 주식회사 엘지화학 | Optical film having improved stability at a high temperature and a polarizing plate comprising the same |
| KR101521682B1 (en) * | 2012-06-01 | 2015-05-20 | 주식회사 엘지화학 | Optical film having improved storage stability at a low temperature and a polarizing plate comprising the same |
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