JP2000347181A - Optical member and liquid crystal display device - Google Patents

Optical member and liquid crystal display device

Info

Publication number
JP2000347181A
JP2000347181A JP11162072A JP16207299A JP2000347181A JP 2000347181 A JP2000347181 A JP 2000347181A JP 11162072 A JP11162072 A JP 11162072A JP 16207299 A JP16207299 A JP 16207299A JP 2000347181 A JP2000347181 A JP 2000347181A
Authority
JP
Japan
Prior art keywords
liquid crystal
adhesive layer
separator
plate
polarizing 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
Application number
JP11162072A
Other languages
Japanese (ja)
Inventor
Yuji Saiki
雄二 済木
Masayuki Satake
正之 佐竹
Yasushi Takahashi
寧 高橋
Takamori Shoda
位守 正田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Denko Corp
Original Assignee
Nitto Denko Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Priority to JP11162072A priority Critical patent/JP2000347181A/en
Publication of JP2000347181A publication Critical patent/JP2000347181A/en
Pending legal-status Critical Current

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  • Optical Elements Other Than Lenses (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain an optical member which hardly causes blocking due to stacking and which is excellent in the assembling efficiency for a liquid crystal display device or the like by temporarily applying a separator having specified or higher surface roughness Ra of the outer surface to cover an adhesive layer formed on the outermost surface, especially on one face of an optical material. SOLUTION: The optical member is produced by temporarily applying a separator having >=0.03 μm surface roughness Ra of the outer surface to cover an adhesive layer formed on the outermost surface, especially on one surface of an optical material, and if necessary, by adhering and applying a protective film on the other side of the optical material. As for the optical material, proper material may be used, for example, a polarizing plate, phase difference plate, or elliptic polarizing plate or luminance improving plate produced by laminating those plates to be used to form a liquid crystal display device or the like, and its kind is not especially limited. Therefore, the polarizing plate may be a reflection type or semitransmission type. For example, the optical member consists of a separator 1, adhesive layer 2, polarizing plate 3, protective film 4, phase difference plate 5, and the like.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の技術分野】本発明は、積み重ねによるブロッキ
ングを生じにくくて液晶表示装置等の組立効率に優れる
光学部材に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical member which is less likely to cause blocking due to stacking and which is excellent in assembling efficiency of a liquid crystal display device or the like.

【0002】[0002]

【発明の背景】液晶表示装置(LCD)の形成などに用
いられる偏光板等は、LCD組立等の効率化などを目的
にそれに液晶セル等の他部材と接着するための粘着層を
予め付設してなる光学部材として用いられるが、その場
合に露出する粘着層が不必要に接着したり汚染されたり
することのないようにセパレータで仮着被覆した状態で
輸送や保管等に供されている。
BACKGROUND OF THE INVENTION A polarizing plate or the like used for forming a liquid crystal display device (LCD) is provided with an adhesive layer for bonding to other members such as a liquid crystal cell in advance for the purpose of increasing the efficiency of LCD assembly and the like. The optical member is used for transportation and storage in a state where it is temporarily covered with a separator so that the exposed adhesive layer is not unnecessarily adhered or contaminated in that case.

【0003】しかしながら、従来の光学部材にあっては
それを積み重ねて輸送又は保管した後それを液晶表示装
置の自動組立作業等に供すると、ブロッキングのために
光学部材を単位毎に分離できずに複数単位を取り込み、
組立装置がその異常を検知して組立ラインが停止し、組
立効率を低下させる問題点があった。
However, if the conventional optical members are stacked and transported or stored and then subjected to an automatic assembling operation of a liquid crystal display device or the like, the optical members cannot be separated for each unit due to blocking. Import multiple units,
There has been a problem that the assembling apparatus detects the abnormality and stops the assembling line, thereby lowering the assembling efficiency.

【0004】[0004]

【発明の技術的課題】本発明は、ブロッキングを生じ難
くて積み重ねた状態で輸送や保管等を行ってそれを液晶
表示装置等の自動組立作業に供しても、その積み重ね体
より光学部材を単位毎に円滑に分離できて複数単位の取
り込みによる組立ラインの停止を回避でき、液晶表示装
置等を組立効率よく製造することができる光学部材の開
発を課題とする。
SUMMARY OF THE INVENTION The present invention is directed to a method of manufacturing a liquid crystal display device by assembling a unit of optical members even when the stacked or stacked unit is transported or stored and used for automatic assembly of a liquid crystal display device or the like. It is an object of the present invention to develop an optical member that can be separated smoothly for each unit, can avoid a stop of an assembly line by taking in a plurality of units, and can efficiently manufacture a liquid crystal display device and the like.

【0005】[0005]

【課題の解決手段】本発明は、光学素材の最表面、特に
その片側に設けた粘着層を、外表面の表面粗さRaが
0.03μm以上のセパレータにて仮着被覆してなり、
必要に応じ光学素材の他面側を保護フィルムにて接着被
覆してなることを特徴とする光学部材を提供するもので
ある。
According to the present invention, an outermost surface of an optical material, in particular, an adhesive layer provided on one side thereof is temporarily adhered and coated with a separator having an outer surface having a surface roughness Ra of 0.03 μm or more,
Another object of the present invention is to provide an optical member characterized in that the other surface of the optical material is bonded and covered with a protective film as necessary.

【0006】[0006]

【発明の効果】本発明の光学部材によれば、積み重ねた
状態で輸送や保管等に供しても、セパレータの外表面に
付与した粗面がブロッキングを防止し、その積み重ね体
を液晶表示装置等の自動組立作業に供して光学部材をそ
の単位毎に円滑に分離でき、複数単位の取り込みによる
組立ラインの停止を回避できて液晶表示装置等を組立効
率よく製造することができる。
According to the optical member of the present invention, the rough surface provided on the outer surface of the separator prevents blocking even when transported or stored in a stacked state, and the stacked body is used for a liquid crystal display device or the like. The optical member can be smoothly separated for each unit by the automatic assembling operation, and the stop of the assembling line by taking in a plurality of units can be avoided, so that the liquid crystal display device and the like can be manufactured with high assembling efficiency.

【0007】[0007]

【発明の実施形態】本発明による光学部材は、光学素材
の最表面、特にその片側に設けた粘着層を、外表面の表
面粗さRaが0.03μm以上のセパレータにて仮着被
覆してなり、必要に応じ光学素材の他面側を保護フィル
ムにて接着被覆したものからなる。その例を図1〜図3
に示した。1がセパレータ、2,21,22が粘着層、
3が偏光板、4が保護フィルム、5が位相差板、6が輝
度向上板である。
BEST MODE FOR CARRYING OUT THE INVENTION An optical member according to the present invention is prepared by temporarily coating an outermost surface of an optical material, particularly an adhesive layer provided on one side thereof, with a separator having an outer surface having a surface roughness Ra of 0.03 μm or more. If necessary, the other side of the optical material is adhered and covered with a protective film. Examples are shown in FIGS.
It was shown to. 1 is a separator, 2, 21 and 22 are adhesive layers,
3 is a polarizing plate, 4 is a protective film, 5 is a retardation plate, and 6 is a brightness enhancement plate.

【0008】光学素材は、例えば偏光板や位相差板、そ
れらを積層した楕円偏光板や輝度向上板等の液晶表示装
置の形成などに用いられる適宜なものであってよく、そ
の種類について特に限定はない。従って偏光板は、反射
型や半透過型のものなどであってもよい。また位相差板
も、1/2や1/4等の波長板や視角補償などの適宜な
目的を有するものであってよい。なお前記した楕円偏光
板の如き積層タイプの光学素材の場合、その積層は粘着
層等の適宜な接着手段を介し行われたものであってよ
い。
The optical material may be any suitable material used for forming a liquid crystal display device such as a polarizing plate, a retardation plate, an elliptically polarizing plate or a brightness enhancement plate obtained by laminating them, and the type thereof is not particularly limited. There is no. Therefore, the polarizing plate may be of a reflection type or a transflective type. Also, the retardation plate may have an appropriate purpose, such as a half-wave plate or a quarter-wave plate or viewing angle compensation. In the case of a laminated type optical material such as the above-mentioned elliptically polarizing plate, the lamination may be performed through an appropriate bonding means such as an adhesive layer.

【0009】ちなみに前記した偏光板の具体例として
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
からなる偏光フィルムなどがあげられる。また偏光板
は、偏光フィルムの片面又は両面に透明保護層を有する
ものなどであってもよい。
Incidentally, specific examples of the above-mentioned polarizing plate include iodine and / or iodine on a hydrophilic polymer film such as a polyvinyl alcohol-based film, a partially formalized polyvinyl alcohol-based film, and an ethylene / vinyl acetate copolymer-based partially saponified film. Examples thereof include a film obtained by adsorbing a dichroic dye and stretching, a polarizing film made of a polyene oriented film such as a dehydrated product of polyvinyl alcohol and a dehydrochlorinated product of polyvinyl chloride. The polarizing plate may have a transparent protective layer on one or both sides of a polarizing film.

【0010】一方、反射型偏光板は、偏光板に反射層を
設けたもので、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。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にて行うことができる。
On the other hand, the reflection type polarizing plate is provided with a reflection layer on the polarizing plate, and is used for forming a liquid crystal display device or the like of a type that reflects incident light from the viewing side (display side) to display. In addition, there is an advantage that a built-in light source such as a backlight can be omitted, and the thickness of the liquid crystal display device can be easily reduced. The reflective 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 surface of the polarizing plate via a transparent protective layer or the like as necessary.

【0011】反射型偏光板の具体例としては、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て反射層を形
成したものなどがあげられる。また前記の透明保護層に
微粒子を含有させて表面微細凹凸構造とし、その上に微
細凹凸構造の反射層を有するものなどもあげられる。な
お反射層は、その反射面が透明保護層や偏光板等で被覆
された状態の使用形態が、酸化による反射率の低下防
止、ひいては初期反射率の長期持続の点や、保護層の別
途付設の回避の点などより好ましい。
Specific examples of the reflective polarizing plate include a transparent protective layer which is matted if necessary, and a reflective layer formed by attaching a foil or a vapor-deposited film made of a reflective metal such as aluminum to one surface of the transparent protective layer. can give. Further, there may be mentioned, for example, those in which fine particles are contained in the transparent protective layer to form a fine surface uneven structure, and a reflective layer having a fine uneven structure is provided thereon. The reflective layer is used in a state where the reflective surface is covered with a transparent protective layer, a polarizing plate, or the like, in order to prevent a decrease in reflectance due to oxidation, and to maintain the initial reflectance for a long period of time, and to separately provide a protective layer. Is more preferable.

【0012】前記した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。
また微粒子含有の透明保護層は、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。
The reflective layer having the above-described fine uneven structure has an advantage that the incident light is diffused by irregular reflection to prevent directivity and glaring appearance, and that unevenness in brightness can be suppressed.
Further, the transparent protective layer containing fine particles also has an advantage that the incident light and the reflected light thereof are diffused when transmitting the light and the unevenness of light and darkness can be further suppressed.

【0013】透明保護層の表面微細凹凸構造を反映させ
た微細凹凸構造の反射層の形成は、例えば真空蒸着方
式、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透明
保護層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。
The reflection layer having a fine uneven structure reflecting the fine uneven structure on the surface of the transparent protective layer is formed by an appropriate method such as an evaporation method such as a vacuum evaporation method, an ion plating method and a sputtering method, and a plating method. The method can be performed by directly attaching a metal to the surface of the transparent protective layer.

【0014】なお上記した偏光板における透明保護層の
形成には、透明性、機械的強度、熱安定性、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。その例
としては、ポリエステル系樹脂やアセテート系樹脂、ポ
リエーテルサルホン系樹脂やポリカーボネート系樹脂、
ポリアミド系樹脂やポリイミド系樹脂、ポリオレフィン
系樹脂やアクリル系樹脂、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。
For the formation of the transparent protective layer in the above-mentioned polarizing plate, a polymer or the like having excellent transparency, mechanical strength, heat stability and moisture shielding properties is preferably used. Examples of such resins include polyester resins and acetate resins, polyethersulfone resins and polycarbonate resins,
Examples of the resin include a polyamide resin, a polyimide resin, a polyolefin resin, an acrylic resin, and a thermosetting resin such as an acrylic resin, a urethane resin, an acrylic urethane resin, an epoxy resin, or a silicone resin, or an ultraviolet curable resin.

【0015】透明保護層は、ポリマーの塗布方式やフィ
ルムとしたものの積層方式などの適宜な方式で形成して
よく、厚さは適宜に決定してよい。一般には500μm
以下、就中1〜300μm、特に5〜200μmの厚さと
される。なお表面微細凹凸構造の透明保護層の形成に含
有させる微粒子としては、例えば平均粒径が0.5〜5
0μm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透
明微粒子が用いられる。微粒子の使用量は、透明樹脂1
00重量部あたり2〜50重量部、就中5〜25重量部
が一般的である。
The transparent protective layer may be formed by an appropriate method such as a method of applying a polymer or a method of laminating a film, and the thickness may be appropriately determined. Generally 500 μm
Hereinafter, the thickness is preferably 1 to 300 μm, particularly 5 to 200 μm. The fine particles to be contained in the formation of the transparent protective layer having the fine surface irregularity structure include, for example, an average particle size of 0.5 to 5
Transparent inorganic fine particles of 0 μm silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide, and the like, and organic fine particles of a crosslinked or uncrosslinked polymer, etc. Fine particles are used. The amount of fine particles used is 1
It is common to use 2 to 50 parts by weight, especially 5 to 25 parts by weight, per 100 parts by weight.

【0016】一方、上記した位相差板の具体例として
は、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
の如き適宜なポリマーからなるフィルムを延伸処理して
なる複屈折性フィルムや液晶ポリマーの配向フィルム、
液晶ポリマーの配向層をフィルムにて支持したものなど
があげられる。
On the other hand, as a specific example of the above retardation plate, a film made of an appropriate polymer such as polycarbonate, polyvinyl alcohol, polystyrene, polymethyl methacrylate, polypropylene, other polyolefin, polyarylate, or polyamide is stretched. Birefringent film or liquid crystal polymer oriented film,
Examples thereof include a film in which an alignment layer of a liquid crystal polymer is supported by a film.

【0017】位相差板は、例えば各種波長板や液晶層の
複屈折による着色や視角等の補償を目的としたものなど
の使用目的に応じた適宜な位相差を有するものであって
よく、厚さ方向の屈折率を制御した傾斜配向フィルムで
あってもよい。また2種以上の位相差板を積層して位相
差等の光学特性を制御したものなどであってもよい。な
お前記の傾斜配向フィルムは、例えばポリマーフィルム
に熱収縮性フィルムを接着して加熱によるその収縮力の
作用化にポリマーフィルムを延伸処理又は/及び収縮処
理する方式や液晶ポリマーを斜め配向させる方式などに
より得ることができる。
The retardation plate may have an appropriate retardation in accordance with the intended use, such as, for example, various wavelength plates or ones for the purpose of compensating coloring or viewing angle due to birefringence of the liquid crystal layer. The film may be an obliquely oriented film having a controlled refractive index in the vertical direction. Further, two or more kinds of retardation plates may be laminated to control optical characteristics such as retardation. The above-mentioned obliquely oriented film is, for example, a method in which a heat-shrinkable film is adhered to a polymer film, and the polymer film is stretched and / or shrunk in order to exert its shrinking force by heating, or a method in which a liquid crystal polymer is obliquely oriented. Can be obtained by

【0018】光学素材は、上記した楕円偏光板や反射型
偏光板や位相差板の積層体の如く、2層又は3層以上の
光学層を積層したものからなっていてもよい。従って図
2や図3に例示した如く偏光板3と位相差板5又は/及
び輝度向上板6を組合せたもの、反射型偏光板や半透過
型偏光板と位相差板を組合せたものなどであってもよ
い。
The optical material may be formed by laminating two or three or more optical layers, such as a laminate of the above-mentioned elliptically polarizing plate, reflection type polarizing plate and retardation plate. Therefore, as shown in FIGS. 2 and 3, a combination of the polarizing plate 3 and the retardation plate 5 or / and the brightness enhancement plate 6 or a combination of the reflection polarizing plate or the transflective polarizing plate and the retardation plate is used. There may be.

【0019】2層又は3層以上の光学層を積層した光学
素材は、液晶表示装置等の製造過程で順次別個に積層す
る方式にても形成しうるものであるが、予め積層して光
学素材としたものは、品質の安定性や組立作業性等に優
れて液晶表示装置などの製造効率を向上させうる利点が
ある。
The optical material in which two or three or more optical layers are laminated can also be formed by a method in which the optical materials are laminated separately in the manufacturing process of a liquid crystal display device or the like. The method described above has an advantage in that it is excellent in quality stability, assembling workability, and the like, and can improve manufacturing efficiency of a liquid crystal display device and the like.

【0020】なお上記した必要に応じ偏光板と組み合わ
されて光学素材とされる輝度向上板は、偏光分離板など
と称呼されることのあるもので、自然光を入射させると
所定偏光軸の直線偏光又は所定方向の円偏光を反射し、
他の光は透過する特性を示すものであり、液晶表示装置
の輝度の向上を目的に用いられるものである。
The brightness enhancement plate, which is combined with a polarizing plate as necessary to form an optical material, is sometimes referred to as a polarization separating plate or the like. When natural light is incident, linearly polarized light having a predetermined polarization axis is obtained. Or reflect circularly polarized light in a predetermined direction,
Other light shows the characteristic of transmitting light, and is used for the purpose of improving the brightness of the liquid crystal display device.

【0021】すなわち輝度向上板は、例えばバックライ
ト等の光源からの光を入射させて所定偏光状態の透過光
を得ると共に、反射光を反射層等を介し反転させて輝度
向上板に再入射させ、その一部又は全部を所定偏光状態
の光として透過させて輝度向上板を透過する光の増量を
図ると共に、偏光板に吸収されにくい偏光を供給して液
晶表示等に利用しうる光量の増大を図る方式などにより
輝度を向上させることを目的に用いられるものである。
That is, the brightness enhancement plate receives light from a light source such as a backlight to obtain transmitted light of a predetermined polarization state, and at the same time, inverts the reflected light through a reflection layer or the like to re-enter the brightness enhancement plate. A part or all of the light is transmitted as light in a predetermined polarization state to increase the amount of light transmitted through the brightness enhancement plate, and at the same time, the amount of light that can be used in a liquid crystal display or the like is increased by supplying polarized light that is hardly absorbed by the polarization plate. It is used for the purpose of improving the luminance by a method for achieving the same.

【0022】従って輝度向上板としては、例えば誘電体
の多層薄膜や屈折率異方性が相違する薄膜フィルムの多
層積層体の如き、所定偏光軸の直線偏光を透過して他の
光は反射する特性を示すもの(3M社製、D−BEF
等)、コレステリック液晶層、就中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
材上に支持したもの(日東電工社製、PCF350やM
erck社製、Transmax等)の如き、左右一方
の円偏光を反射して他の光は透過する特性を示すものな
どの適宜なものを用いうる。
Accordingly, as a brightness enhancement plate, for example, a linearly polarized light having a predetermined polarization axis is transmitted and other light is reflected, such as a multilayer thin film of a dielectric or a multilayer laminate of thin films having different refractive index anisotropy. Those exhibiting characteristics (D-BEF, manufactured by 3M)
Etc.), cholesteric liquid crystal layer, especially cholesteric liquid crystal polymer oriented film and those having the oriented liquid crystal layer supported on a film substrate (manufactured by Nitto Denko Corporation, PCF350 or M
Appropriate materials such as those exhibiting characteristics of reflecting one of the left and right circularly polarized light and transmitting the other light, such as Transmax manufactured by erck, can be used.

【0023】前記した所定偏光軸の直線偏光を透過する
タイプの輝度向上板では、その透過光をそのまま偏光板
に偏光軸を揃えて入射させることにより偏光板による吸
収ロスを抑制しつつ効率よく透過させることができる。
In the brightness enhancement plate of the type that transmits linearly polarized light having a predetermined polarization axis, the transmitted light is incident on the polarization plate with the polarization axis aligned as it is, thereby efficiently transmitting the light while suppressing the absorption loss by the polarization plate. Can be done.

【0024】一方、コレステリック液晶層の如く円偏光
を透過するタイプの輝度向上板では、そのまま偏光板に
入射させることもできるが、吸収ロスを抑制する点より
はその透過円偏光を位相差板を介し直線偏光化して偏光
板に入射させることが好ましい。ちなみにその位相差板
として1/4波長板を用いて偏光板と輝度向上板の間に
配置することにより、円偏光を直線偏光に変換すること
ができる。
On the other hand, a brightness enhancement plate of a type that transmits circularly polarized light, such as a cholesteric liquid crystal layer, can be incident on the polarizing plate as it is. It is preferable that the light is converted into linearly polarized light through the polarizer and then incident on the polarizing plate. Incidentally, by using a quarter-wave plate as the retardation plate and disposing it between the polarizing plate and the brightness enhancement plate, it is possible to convert circularly polarized light into linearly polarized light.

【0025】可視光域等の広い波長範囲で1/4波長板
として機能する位相差板は、例えば波長550nmの光等
の単色光に対して1/4波長板として機能する位相差層
と他の位相差特性を示す位相差層、例えば1/2波長板
として機能する位相差層とを重畳する方式などにより得
ることができる。従って偏光板と輝度向上板の間に配置
する位相差板は、1層又は2層以上の位相差層からなる
ものであってよい。
A retardation plate that functions as a quarter-wave plate in a wide wavelength range such as a visible light region is, for example, a retardation layer that functions as a quarter-wave plate with respect to monochromatic light such as light having a wavelength of 550 nm. , For example, a method of superimposing a retardation layer functioning as a half-wave plate with the retardation layer exhibiting the above retardation characteristic. Therefore, the retardation plate disposed between the polarizing plate and the brightness enhancement plate may be composed of one or more retardation layers.

【0026】なおコレステリック液晶層についても、反
射波長が相違するものの組合せにて2層又は3層以上重
畳した配置構造とすることにより、可視光域等の広い波
長範囲で円偏光を反射するものを得ることができ、それ
に基づいて広い波長範囲の透過円偏光を得ることができ
る。
The cholesteric liquid crystal layer has a structure in which two or three or more cholesteric liquid crystal layers having different reflection wavelengths are overlapped with each other to reflect circularly polarized light in a wide wavelength range such as a visible light region. Thus, it is possible to obtain circularly polarized light transmitted in a wide wavelength range.

【0027】本発明による光学部材は、液晶セル等の他
部材に接着することを目的とした粘着層を光学素材の片
面又は両面の最表面に設けて、その粘着層を外表面の表
面粗さRaが0.03μm以上のセパレータにて仮着被
覆したものである。従ってセパレータは、光学素材の表
裏両面に設けうるものであるが、一般には図例の如く光
学素材の片側に粘着層2を設けてそれをセパレータ1に
て仮着被覆し、光学素材の他面側には表面の損傷防止等
を目的とした保護フィルム4を接着被覆した形態とされ
る。
In the optical member according to the present invention, an adhesive layer intended to adhere to another member such as a liquid crystal cell is provided on one or both outermost surfaces of the optical material, and the adhesive layer is provided with a surface roughness of the outer surface. This is temporarily coated with a separator having an Ra of 0.03 μm or more. Therefore, the separator can be provided on both the front and back surfaces of the optical material. In general, an adhesive layer 2 is provided on one side of the optical material as shown in FIG. On the side, a protective film 4 for the purpose of preventing damage to the surface is bonded and coated.

【0028】前記の粘着層を仮着被覆するセパレータ
は、粘着層を実用に供するまでの間その汚染を防止する
ことや、粘着層が露出すると不必要に接着して取扱いに
くいことよりその不必要な接着を防止することなどを目
的とする。セパレータの形成は、例えば適宜な薄葉体に
必要に応じシリコーン系や長鎖アルキル系、フッ素系や
硫化モリブデン等の適宜な剥離剤による剥離コートを設
ける方式などにより行うことができる。
The separator to which the pressure-sensitive adhesive layer is temporarily adhered is used to prevent the contamination of the pressure-sensitive adhesive layer until the pressure-sensitive adhesive layer is put to practical use. The purpose is to prevent excessive adhesion. The separator can be formed by, for example, a method of providing a release coat with an appropriate release agent such as a silicone-based, long-chain alkyl-based, fluorine-based, or molybdenum sulfide as needed on a suitable thin leaf.

【0029】なお前記の薄葉体には、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従来に準
じた適宜なものを用いることができる。薄葉体の厚さ
は、強度等に応じて適宜に決定でき、一般には500μ
m以下、就中5〜300μm、特に10〜200μmとさ
れるが、コレに限定されない。
As the above-mentioned thin leaf, for example, a plastic film or rubber sheet, paper or cloth, nonwoven fabric or net, foamed sheet or metal foil, or a laminate thereof may be used as appropriate. . The thickness of the thin leaf can be appropriately determined according to the strength and the like.
m, especially 5 to 300 μm, especially 10 to 200 μm, but is not limited to this.

【0030】一方、前記した保護フィルムは、保護基材
のみにても形成しうるが一般には、保護基材に粘着層を
設けてその粘着層と共に保護基材を光学素材より剥離で
きるように形成される。従って通例、セパレータの場合
にはその剥離で粘着層が光学部材に残存するが、保護フ
ィルムの場合にはその剥離で光学素材の表面が露出す
る。
On the other hand, the above-mentioned protective film can be formed only on the protective substrate, but is generally formed such that an adhesive layer is provided on the protective substrate and the protective substrate can be peeled off from the optical material together with the adhesive layer. Is done. Therefore, in the case of a separator, the pressure-sensitive adhesive layer is usually left on the optical member by peeling, whereas in the case of a protective film, the surface of the optical material is exposed by peeling.

【0031】なお前記の如く保護フィルムについてもセ
パレータに準じて、それが接着する粘着層を光学素材に
残存させるように形成することもできる。また保護フィ
ルムを形成する保護基材には、前記のセパレータに準じ
た適宜な薄葉体を用いることができる。
As described above, the protective film can also be formed according to the separator so that the adhesive layer to which the protective film adheres is left on the optical material. Further, as a protective base material for forming the protective film, an appropriate thin leaf according to the above-described separator can be used.

【0032】前記したセパレータを仮着して光学素材に
残存させる粘着層や保護基材に設ける粘着層の形成に
は、適宜な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。ちなみにその例としては、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、ポリアミドやポリエーテル、フッ素系やゴム系な
どの適宜なポリマーをベースポリマーとするものなどが
あげられる。
For forming the pressure-sensitive adhesive layer temporarily attached to the optical material and remaining on the optical material or the pressure-sensitive adhesive layer provided on the protective substrate, an appropriate pressure-sensitive adhesive or pressure-sensitive adhesive can be used, and there is no particular limitation. Incidentally, examples thereof include those using an appropriate polymer such as an acrylic polymer, a silicone polymer, a polyester or a polyurethane, a polyamide or a polyether, a fluorine or a rubber as a base polymer, and the like.

【0033】就中、光学素材に残存させる粘着層の形成
には、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の粘着特性を示して、耐候
性や耐熱性などに優れるものが好ましく用いうる。
In particular, the formation of the adhesive layer remaining on the optical material is excellent in optical transparency like an acrylic adhesive, and exhibits appropriate wettability, cohesiveness and adhesive adhesive properties, and Those excellent in heat resistance and the like can be preferably used.

【0034】また上記に加えて光学素材に残存させる粘
着層は、吸湿による発泡現象や剥がれ現象の防止、熱膨
張差等による光学特性の低下や液晶セルの反り防止、ひ
いては高品質で耐久性に優れる液晶表示装置の形成性な
どの点より、吸湿率が低くて耐熱性に優れるものにて形
成されていることが好ましい。
In addition to the above, the adhesive layer remaining on the optical material prevents foaming and peeling phenomena due to moisture absorption, prevents deterioration of optical characteristics due to differences in thermal expansion, prevents warpage of the liquid crystal cell, and provides high quality and durability. From the viewpoint of excellent formability of a liquid crystal display device, it is preferable that the liquid crystal display device is formed of a material having a low moisture absorption rate and excellent heat resistance.

【0035】粘着層は、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粘着層に添加されること
のある適宜な添加剤を含有していてもよい。また光学素
材に残存させる粘着層は、微粒子を含有して光拡散性を
示すものなどであってもよい。
The adhesive layer is made of, for example, natural or synthetic resins, especially, tackifier resins, fillers, pigments, coloring agents, oxidizing agents, and the like comprising glass fibers, glass beads, metal powders, and other inorganic powders. It may contain an appropriate additive such as an inhibitor which may be added to the adhesive layer. The adhesive layer remaining on the optical material may be one containing fine particles and exhibiting light diffusivity.

【0036】光学素材や保護基材への粘着層の付設は、
適宜な方式で行いうる。ちなみにその例としては、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光
学素材や保護基材の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光学素
材等の上に移着する方式などがあげられる。
The attachment of an adhesive layer to an optical material or a protective substrate
It can be performed in an appropriate manner. Incidentally, as an example, an adhesive substance or a composition thereof is dissolved or dispersed in a solvent composed 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. Then, it is directly applied on an optical material or a protective substrate by an appropriate developing method such as a casting method or a coating method, or an adhesive layer is formed on a separator according to the above, and the optical material or the like is formed. And transfer to the top.

【0037】粘着層は、異なる組成又は種類等のものの
重畳層として光学部材や保護基材に設けることもでき
る。粘着層の厚さは、使用目的や接着力などに応じて適
宜に決定でき、一般には1〜500μm、就中5〜20
0μm、特に10〜100μmとされる。なお光学部材又
は保護基材に設ける粘着層は、組成や種類等が同じであ
ってもよいし、異なるものであってもよい。
The pressure-sensitive adhesive layer may be provided on the optical member or the protective substrate as a superposed layer of different compositions or types. The thickness of the pressure-sensitive adhesive layer can be appropriately determined depending on the purpose of use, adhesive strength, and the like, and is generally 1 to 500 μm, preferably 5 to 20 μm.
0 μm, especially 10 to 100 μm. The pressure-sensitive adhesive layer provided on the optical member or the protective substrate may have the same composition, the same type, or the like, or may have different compositions.

【0038】なお外表面となるセパレータの表面が平滑
である場合、Raに基づいて0.03μm以上の表面粗
さは、例えばバフ処理やエンボス加工等の適宜な粗面化
処理方式を適用して形成することができる。積み重ねに
よるブロッキングの防止、光学素子や粘着層への表面粗
さの反映による光学特性や粘着特性の低下の防止などの
点よりセパレータの外表面における好ましい表面粗さR
aは、0.04〜10μm、就中5μm以下、特に0.0
5〜1μmである。
When the outer surface of the separator is smooth, a surface roughness of 0.03 μm or more based on Ra can be obtained by applying an appropriate surface roughening method such as buffing or embossing. Can be formed. Preferred surface roughness R on the outer surface of the separator from the viewpoint of preventing blocking due to stacking, and preventing deterioration of optical properties and adhesive properties due to reflection of surface roughness on the optical element and the adhesive layer.
a is 0.04 to 10 μm, preferably 5 μm or less, particularly 0.0
5-1 μm.

【0039】上記の光学部材を形成する偏光板や位相差
板、輝度向上板や透明保護層、粘着層やセパレータなど
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たものなどであってもよい。
Each layer such as a polarizing plate, a retardation plate, a brightness enhancement plate, a transparent protective layer, an adhesive layer and a separator, which form the optical member, is made of, for example, a salicylate compound, a benzophenol compound, a benzotriazole compound, or the like. A material having an ultraviolet absorbing ability by an appropriate method such as a method of treating with an ultraviolet absorbent such as a cyanoacrylate compound or a nickel complex compound may be used.

【0040】本発明による光学部材は、液晶表示装置等
の各種装置の形成などに好ましく用いることができる。
その液晶表示装置は、本発明による光学部材をそのセパ
レータを剥がした粘着層を介して液晶セルの片側又は両
側に配置してなる透過型や反射型、あるいは透過・反射
両用型等の従来に準じた適宜な構造を有するものとして
形成することができる。
The optical member according to the present invention can be preferably used for forming various devices such as a liquid crystal display device.
The liquid crystal display device conforms to a conventional type such as a transmissive type or a reflective type, or a transmissive / reflective type in which the optical member according to the present invention is disposed on one or both sides of a liquid crystal cell via an adhesive layer from which the separator is peeled off. It can be formed as having an appropriate structure.

【0041】[0041]

【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
水溶液中で5倍に延伸処理して形成した偏光フィルムの
両側にポリビニルアルコール系接着層を介してトリアセ
チルセルロースフィルムを接着してなる厚さ約180μ
mの偏光板の片面に、厚さ50μmのポリエステルフィル
ムの裏面に厚さ20μmのアクリル系粘着層を設けてな
る保護フィルムをその粘着層を介して接着した。
Example 1 A triacetyl cellulose film was adhered to both sides of a polarizing film formed by stretching a polyvinyl alcohol film having a thickness of 80 μm by a factor of 5 in an aqueous iodine solution via a polyvinyl alcohol-based adhesive layer. About 180μ thick
A protective film having a 50 μm thick polyester film and a 20 μm thick acrylic pressure-sensitive adhesive layer provided on the back surface was bonded to one surface of a polarizing plate having a thickness of 50 μm via the pressure-sensitive adhesive layer.

【0042】次に前記偏光板の他面に、厚さ38μmの
ポリエステルフィルムからなるセパレータの裏面にシリ
コーン系剥離コートを介し厚さ25μmのアクリル系粘
着層を設けてそれをセパレータと共に接着して光学部材
を得た。なお前記したセパレータの外表面の表面粗さR
aは、表面粗さ計(東京精密社製、サーフコム、以下同
じ)による測定にて0.06μmであった。
Next, an acrylic adhesive layer having a thickness of 25 μm was provided on the other surface of the polarizing plate through a silicone release coat on the back surface of a separator made of a polyester film having a thickness of 38 μm, and the acrylic adhesive layer was adhered to the separator together with the separator. A member was obtained. The surface roughness R of the outer surface of the separator described above
a was 0.06 μm as measured by a surface roughness meter (Surfcom, manufactured by Tokyo Seimitsu Co., Ltd .; the same applies hereinafter).

【0043】実施例2 偏光板のセパレータを剥がしてそれにポリカーボネート
フィルムを170℃で一軸延伸処理してなる位相差板を
接着し、その位相差板にセパレータに設けた厚さ25μ
mのアクリル系粘着層をセパレータと共に接着したほか
は実施例1に準じて光学部材を得た。
Example 2 A separator of a polarizing plate was peeled off, and a retardation plate obtained by uniaxially stretching a polycarbonate film at 170 ° C. was adhered thereto, and the separator provided on the retardation plate had a thickness of 25 μm.
An optical member was obtained in the same manner as in Example 1, except that the m-type acrylic pressure-sensitive adhesive layer was adhered together with the separator.

【0044】実施例3 位相差板として、傾斜配向のディスコティック液晶層を
フィルム基材にて支持してなるもの(富士フイルム社
製、WVA02A)を用いたほかは実施例2に準じて光
学部材を得た。
Example 3 An optical member according to Example 2, except that a retardation plate having a discotic liquid crystal layer of inclined orientation supported by a film substrate (WVA02A, manufactured by FUJIFILM Corporation) was used. I got

【0045】実施例4 コレステリック液晶層を支持するフィルム基材と1/4
波長板との積層体からなる輝度向上板(日東電工社製、
PCF350)を厚さ25μmのアクリル系粘着層を介
して、保護フィルムを剥がした偏光板に接着し、その剥
がした保護フィルムを輝度向上板の露出面に接着したほ
かは実施例1に準じて光学部材を得た。
Example 4 Film base supporting cholesteric liquid crystal layer and 1/4
Brightness enhancement plate made of a laminate with a wave plate (Nitto Denko Corporation,
PCF350) was adhered to the polarizing plate from which the protective film was peeled off via an acrylic adhesive layer having a thickness of 25 μm, and the peeled protective film was adhered to the exposed surface of the brightness enhancement plate. A member was obtained.

【0046】比較例 セパレータとして、外表面の表面粗さRaが0.02μ
mのものを用いたほかは実施例1に準じて光学部材を得
た。
Comparative Example As a separator, the outer surface had a surface roughness Ra of 0.02 μm.
An optical member was obtained in the same manner as in Example 1 except that m was used.

【0047】評価試験 実施例、比較例で得た光学部材の30単位を順次積み重
ねてそれをポリエチレン製内袋と防湿アルミ製外袋とで
減圧下に密封処理して48時間放置したのち開封して、
ブロッキングの有無を調べた。その結果を次表に示し
た。
Evaluation Test 30 units of the optical members obtained in Examples and Comparative Examples were sequentially stacked, sealed with a polyethylene inner bag and a moisture-proof aluminum outer bag under reduced pressure, left for 48 hours, and then opened. hand,
The presence or absence of blocking was examined. The results are shown in the following table.

【0048】 実施例1 実施例2 実施例3 実施例4 比 較 例 ブロッキング なし なし なし なし あり Example 1 Example 2 Example 3 Example 4 Comparative Example Blocking No No No No No Yes

【0049】前記において、比較例ではセパレータ面を
介して各単位がブロッキングしていたが、実施例1〜4
ではブロッキングせず、その積み重ね体を自動接着処理
機に供して各単位毎にスムーズに分離し、そのセパレー
タを剥離して粘着層を介し液晶セルに接着処理でき複数
単位の取り込みによる装置のストップは生じなかった。
In the above, each unit was blocked via the separator surface in the comparative example.
Then, without blocking, the stack is subjected to an automatic adhesion processing machine and separated smoothly for each unit, the separator is peeled off and adhered to the liquid crystal cell via the adhesive layer, and the stop of the device by taking in multiple units is possible. Did not occur.

【図面の簡単な説明】[Brief description of the drawings]

【図1】光学部材例の断面図FIG. 1 is a cross-sectional view of an example of an optical member.

【図2】他の光学部材例の断面図FIG. 2 is a sectional view of another example of an optical member.

【図3】さらに他の光学部材例の断面図FIG. 3 is a cross-sectional view of still another optical member example.

【符号の説明】[Explanation of symbols]

1:セパレータ 2,21,22:粘着層 3:偏光板(光学素材) 4:保護フィルム 5:位相差板(光学素材) 6:輝度向上板(光学素材) 1: separator 2, 21, 22: adhesive layer 3: polarizing plate (optical material) 4: protective film 5: retardation plate (optical material) 6: brightness enhancement plate (optical material)

───────────────────────────────────────────────────── フロントページの続き (72)発明者 高橋 寧 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 (72)発明者 正田 位守 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) 2H042 BA02 BA03 BA20 DA02 DA11 DA21 DC01 DC02 DE00 2H049 BA02 BA06 BB03 BB54 BC14 BC22 2H091 FA08X FA08Y FA11X FA11Y FA14Y FB02 FD14 GA01 LA02 LA12  ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Ning Takahashi 1-1-2 Shimohozumi, Ibaraki City, Osaka Prefecture Inside Nitto Denko Corporation (72) Inventor Homori Mamoru 1-1-1 Shimohozumi, Ibaraki City, Osaka Prefecture No. 2 Nitto Denko Corporation F term (reference) 2H042 BA02 BA03 BA20 DA02 DA11 DA21 DC01 DC02 DE00 2H049 BA02 BA06 BB03 BB54 BC14 BC22 2H091 FA08X FA08Y FA11X FA11Y FA14Y FB02 FD14 GA01 LA02 LA12

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 光学素材の最表面に設けた粘着層を、外
表面の表面粗さRaが0.03μm以上のセパレータに
て仮着被覆してなることを特徴とする光学部材。
1. An optical member comprising: a pressure-sensitive adhesive layer provided on the outermost surface of an optical material; and a temporary coating of an outer surface with a separator having a surface roughness Ra of 0.03 μm or more.
【請求項2】 請求項1において、セパレータを光学素
材の片面側に有して光学素材の他面側には保護フィルム
を有してなる光学部材。
2. The optical member according to claim 1, comprising a separator on one side of the optical material and a protective film on the other side of the optical material.
【請求項3】 請求項1又は2において、光学素材が偏
光板又はそれと位相差板若しくは輝度向上板を少なくと
も有するものである光学部材。
3. The optical member according to claim 1, wherein the optical material has at least a polarizing plate or a polarizing plate and a retardation plate or a brightness enhancement plate.
【請求項4】 請求項1〜3に記載の光学部材をそのセ
パレータを剥がした状態で具備することを特徴とする液
晶表示装置。
4. A liquid crystal display device comprising the optical member according to claim 1 with its separator removed.
JP11162072A 1999-06-09 1999-06-09 Optical member and liquid crystal display device Pending JP2000347181A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11162072A JP2000347181A (en) 1999-06-09 1999-06-09 Optical member and liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11162072A JP2000347181A (en) 1999-06-09 1999-06-09 Optical member and liquid crystal display device

Publications (1)

Publication Number Publication Date
JP2000347181A true JP2000347181A (en) 2000-12-15

Family

ID=15747568

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11162072A Pending JP2000347181A (en) 1999-06-09 1999-06-09 Optical member and liquid crystal display device

Country Status (1)

Country Link
JP (1) JP2000347181A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002258050A (en) * 2001-03-05 2002-09-11 Nitto Denko Corp Polarizing plate and liquid crystal display device using the same
JP2002303730A (en) * 2001-04-09 2002-10-18 Nitto Denko Corp Optical member
CN1302298C (en) * 2001-10-16 2007-02-28 日东电工株式会社 Method for mfg. polaroid and liquid crystal display device
WO2007102327A1 (en) * 2006-03-08 2007-09-13 Konica Minolta Opto, Inc. Polarizing plate and liquid crystal display
JP2010026529A (en) * 2009-10-27 2010-02-04 Nitto Denko Corp Wide view angle polarization film for liquid crystal display, and wide view angle polarization tacky adhesive film for liquid crystal display
KR20170113168A (en) * 2016-03-28 2017-10-12 스미또모 가가꾸 가부시키가이샤 Optical film and polarizing plate
CN109844582A (en) * 2016-10-14 2019-06-04 住友化学株式会社 Polarizing film, polarization plates and image display device
WO2022186002A1 (en) * 2021-03-04 2022-09-09 東洋紡株式会社 Laminate of inorganic substrate/polymer film layer with attached protective film, laminate stack, laminate storage method, and laminate transport method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002258050A (en) * 2001-03-05 2002-09-11 Nitto Denko Corp Polarizing plate and liquid crystal display device using the same
JP2002303730A (en) * 2001-04-09 2002-10-18 Nitto Denko Corp Optical member
CN1302298C (en) * 2001-10-16 2007-02-28 日东电工株式会社 Method for mfg. polaroid and liquid crystal display device
WO2007102327A1 (en) * 2006-03-08 2007-09-13 Konica Minolta Opto, Inc. Polarizing plate and liquid crystal display
JP2010026529A (en) * 2009-10-27 2010-02-04 Nitto Denko Corp Wide view angle polarization film for liquid crystal display, and wide view angle polarization tacky adhesive film for liquid crystal display
KR20170113168A (en) * 2016-03-28 2017-10-12 스미또모 가가꾸 가부시키가이샤 Optical film and polarizing plate
KR102294328B1 (en) 2016-03-28 2021-08-25 스미또모 가가꾸 가부시키가이샤 Optical film and polarizing plate
CN109844582A (en) * 2016-10-14 2019-06-04 住友化学株式会社 Polarizing film, polarization plates and image display device
CN109844582B (en) * 2016-10-14 2021-06-08 住友化学株式会社 Polarizing plate, and image display device
WO2022186002A1 (en) * 2021-03-04 2022-09-09 東洋紡株式会社 Laminate of inorganic substrate/polymer film layer with attached protective film, laminate stack, laminate storage method, and laminate transport method

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