JPH11237502A - Scattering type tacky adhesive layer and optical member - Google Patents
Scattering type tacky adhesive layer and optical memberInfo
- Publication number
- JPH11237502A JPH11237502A JP5621098A JP5621098A JPH11237502A JP H11237502 A JPH11237502 A JP H11237502A JP 5621098 A JP5621098 A JP 5621098A JP 5621098 A JP5621098 A JP 5621098A JP H11237502 A JPH11237502 A JP H11237502A
- Authority
- JP
- Japan
- Prior art keywords
- scattering
- adhesive layer
- light
- sensitive adhesive
- tacky adhesive
- 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
Links
Landscapes
- Polarising Elements (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
【０００１】[0001]
【発明の技術分野】本発明は、偏光状態の維持性、後方
散乱や回折着色の抑制性等に優れて液晶表示装置用の光
学部材などに好適な散乱型粘着層に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scattering type pressure-sensitive adhesive layer which is excellent in maintaining a polarization state, suppressing backscattering and diffractive coloring and suitable for an optical member for a liquid crystal display.
【０００２】[0002]
【背景技術】従来、粘着層に光散乱性を付与する方式と
しては、表面の粗面化を維持することが困難なことか
ら、屈折率が相違する粒子を混入させる方式が知られて
いた。しかしながら、散乱がレイリー散乱となって直線
偏光等の偏光状態を解消させたり、反射方向を含む全方
位に散乱して多くの後方散乱を生じる問題点、あるいは
回折による散乱を生じて散乱光が着色化する問題点もあ
った。2. Description of the Related Art Conventionally, as a method of imparting light scattering properties to an adhesive layer, a method of mixing particles having different refractive indices has been known because it is difficult to maintain a roughened surface. However, the scattering becomes Rayleigh scattering, eliminating the polarization state such as linearly polarized light, or scattering in all directions including the reflection direction to cause a large amount of backscattering, or scattering due to diffraction causes coloring of the scattered light. There was also the problem of becoming.
【０００３】[0003]
【発明の技術的課題】本発明は、レイリー散乱や回折散
乱を生じにくくて偏光状態の解消や後方散乱や散乱光の
着色化を生じにくい散乱型粘着層の開発を課題とする。SUMMARY OF THE INVENTION An object of the present invention is to develop a scattering-type adhesive layer which hardly causes Rayleigh scattering or diffraction scattering, eliminates polarization state, and does not easily cause back scattering or coloring of scattered light.
【０００４】[0004]
【課題の解決手段】本発明は、粒径をＤ、入射光の波長
をλとしたとき、式：α＝πＤ／λにて定義される散乱
パラメータαが１〜２０の透明無着色粒子を光透過性の
粘着層に、その粘着層平面に対する前記透明無着色粒子
の単位面積あたりの投影面積の総和として定義される粒
子投影面積比γが０．１〜１となる状態に分散含有させ
たことを特徴とする散乱型粘着層、及び光学素材に少な
くとも１層の前記散乱型粘着層を付設してなることを特
徴とする光学部材を提供するものである。According to the present invention, when the particle diameter is D and the wavelength of the incident light is λ, the transparent non-colored particles having a scattering parameter α defined by the formula α = πD / λ of 1 to 20 are obtained. The light-transmitting pressure-sensitive adhesive layer was dispersed and contained in such a state that the particle projected area ratio γ defined as the total projected area per unit area of the transparent uncolored particles with respect to the plane of the pressure-sensitive adhesive layer was 0.1 to 1. It is another object of the present invention to provide a scattering type pressure-sensitive adhesive layer and an optical member comprising at least one scattering type pressure-sensitive adhesive layer provided on an optical material.
【０００５】[0005]
【発明の効果】本発明によれば、レイリー散乱や回折散
乱を生じにくくて偏光状態の解消や後方散乱や散乱光の
着色化を生じにくい散乱型粘着層を得ることができ、こ
れは用いる粒子の散乱パラメータと粘着層における粒子
投影面積比γを制御したことによる。すなわち本発明者
らは、上記の課題を克服するために鋭意研究を重ねる中
で、レイリー散乱は粒子の粒径が入射光の波長に対して
小さい場合に生じやすく、回折散乱はその粒径が入射光
の波長に対して大きい場合に生じやすいことを究明し
た。According to the present invention, it is possible to obtain a scattering-type pressure-sensitive adhesive layer which hardly causes Rayleigh scattering or diffraction scattering, eliminates polarization state, and does not easily cause back scattering or coloring of scattered light. And the particle projection area ratio γ in the adhesive layer was controlled. In other words, the present inventors have conducted intensive studies to overcome the above-mentioned problems, and as a result, Rayleigh scattering tends to occur when the particle size of the particles is smaller than the wavelength of the incident light, and diffraction scattering It has been found that it is likely to occur when the wavelength is large with respect to the wavelength of the incident light.
【０００６】そして本発明者らは、前記の知見に基づい
て式：α＝πＤ／λにて定義される散乱パラメータα
（ただし、Ｄは混入粒子の粒径、λは入射光の波長であ
る。）を導出し、その散乱パラメータαが１〜２０の粒
子を用いて粘着層における粒子投影面積比γが０．１〜
１となるように混入させることにより、レイリー散乱と
回折散乱を抑制して、前記の性能を示す散乱型粘着層を
得ることに成功した。Then, based on the above findings, the present inventors have proposed a scattering parameter α defined by an equation: α = πD / λ.
(Where D is the particle diameter of the mixed particles, and λ is the wavelength of the incident light), and the particle projection area ratio γ in the adhesive layer is 0.1 using particles having a scattering parameter α of 1 to 20. ~
By mixing so as to be 1, Rayleigh scattering and diffraction scattering were suppressed, and a scattering type adhesive layer having the above-mentioned performance was successfully obtained.
【０００７】前記の結果、かかる散乱型粘着層を偏光板
や位相差板等の光学素材に付設して光学部材とし、それ
を透過型液晶表示装置のバックライトと液晶セルの間、
あるいは反射型液晶表示装置の反射板と液晶セルの間や
鏡面反射板の反射表面などに配置することにより、画面
のギラツキや液晶層の影の抑制、反射光に対する拡散性
の付与等を達成できて明るさや表示品位に優れた良視認
性の液晶表示装置などを形成でき、また粘着層が光散乱
層を兼ねることで別個の光散乱板を配置する必要を回避
でき、部材の省略による軽量化や薄型化を図ることがで
きる。As a result, the scattering-type adhesive layer is attached to an optical material such as a polarizing plate or a retardation plate to form an optical member, which is disposed between a backlight of a transmission type liquid crystal display device and a liquid crystal cell.
Alternatively, by arranging it between the reflection plate and the liquid crystal cell of the reflection type liquid crystal display device or on the reflection surface of the specular reflection plate, it is possible to suppress the glare of the screen, the shadow of the liquid crystal layer, and the diffusion of the reflected light. To form a liquid crystal display device with good visibility that is excellent in brightness and display quality, and because the adhesive layer also serves as a light scattering layer, the need to arrange a separate light scattering plate can be avoided, and weight reduction by omitting members And a reduction in thickness.
【０００８】[0008]
【発明の実施形態】本発明による散乱型粘着層は、粒径
をＤ、入射光の波長をλとしたとき、式：α＝πＤ／λ
にて定義される散乱パラメータαが１〜２０の透明無着
色粒子を光透過性の粘着層に、その粘着層平面に対する
前記透明無着色粒子の単位面積あたりの投影面積の総和
として定義される粒子投影面積比γが０．１〜１となる
状態に分散含有させたものからなる。BEST MODE FOR CARRYING OUT THE INVENTION The scattering type adhesive layer according to the present invention has the following formula: α = πD / λ, where D is the particle size and λ is the wavelength of the incident light.
Particles defined as the total of the projected area per unit area of the transparent uncolored particles with respect to the plane of the adhesive layer, with the transparent uncolored particles having a scattering parameter α defined in It is made of a material dispersed and contained in a state where the projected area ratio γ is 0.1 to 1.
【０００９】また本発明による光学部材は、光学素材に
少なくとも１層の前記散乱型粘着層を付設したものより
なる。その光学部材の例を図１、図２に示した。１が透
明無着色粒子１１を分散含有する散乱型粘着層、２が光
学素材であり、１２はセパレータ、２１は位相差板、２
２は接着層、２３は偏光板である。Further, the optical member according to the present invention comprises an optical material provided with at least one scattering type adhesive layer. Examples of the optical member are shown in FIGS. 1 is a scattering adhesive layer containing dispersed and non-colored particles 11 dispersed therein, 2 is an optical material, 12 is a separator, 21 is a retardation plate, 2
2 is an adhesive layer and 23 is a polarizing plate.
【００１０】粘着層の形成には、光透過性を示す適宜な
粘着性物質を用いることができ、その種類について特に
限定はない。ちなみに前記粘着性物質の例としては、ゴ
ム系粘着剤やアクリル系粘着剤、シリコーン系粘着剤や
ビニルアルキルエーテル系粘着剤、ポリビニルアルコー
ル系粘着剤やポリビニルピロリドン系粘着剤、ポリアク
リルアミド系粘着剤やセルロース系粘着剤などがあげら
れる。光透過性に優れるものが好ましく、耐候性等も加
味した場合、特にアクリル系粘着剤が好ましく用いう
る。In forming the adhesive layer, an appropriate adhesive substance having a light transmitting property can be used, and the kind thereof is not particularly limited. Incidentally, examples of the adhesive substance include a rubber-based adhesive and an acrylic-based adhesive, a silicone-based adhesive and a vinylalkyl ether-based adhesive, a polyvinyl alcohol-based adhesive and a polyvinylpyrrolidone-based adhesive, a polyacrylamide-based adhesive and the like. Cellulose-based adhesives and the like can be mentioned. Those having excellent light transmittance are preferable, and in consideration of weather resistance and the like, an acrylic pressure-sensitive adhesive can be particularly preferably used.
【００１１】粘着層に光散乱性を付与することを目的に
分散含有させる透明無着色粒子は、その粒径をＤ、入射
光の波長をλとしたとき、式：α＝πＤ／λにて定義さ
れる散乱パラメータαが１〜２０のものである。これに
よりレイリー散乱や回折散乱を生じにくい光散乱層とす
ることができる。レイリー散乱や回折散乱をより低減す
る点などよりは、前記の散乱パラメータαが２〜１８、
就中３〜１６、特に４〜１４のものが好ましい。The transparent uncolored particles dispersed and contained for the purpose of imparting a light scattering property to the adhesive layer are represented by the following formula: α = πD / λ, where D is the particle size, and λ is the wavelength of the incident light. The defined scattering parameter α is 1 to 20. This makes it possible to provide a light scattering layer that does not easily cause Rayleigh scattering or diffraction scattering. Rather than the point of further reducing Rayleigh scattering or diffraction scattering, the scattering parameter α is 2 to 18,
Among them, those having 3 to 16, especially 4 to 14 are preferred.
【００１２】透明無着色粒子としては、無色透明性の適
宜なものを用いうる。ちなみにその例としては、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の導電性の
こともある無機系粒子、架橋又は未架橋の各種ポリマー
等からなる有機系粒子などがあげられる。As the transparent and non-colored particles, any suitable colorless and transparent particles can be used. Incidentally, examples thereof include silica, alumina, titania, zirconia, tin oxide, indium oxide, electrically conductive inorganic particles such as cadmium oxide and antimony oxide, and organic particles composed of various crosslinked or uncrosslinked polymers. And so on.
【００１３】後方散乱をより抑制して透過方向に良好な
拡散性をもたせる点などよりは、透明無着色粒子の屈折
率をｎ1、粘着層の屈折率をｎ2として、式：０．９２＜
ｎ1／ｎ2＜１．０８を満足する組合せとすることが好ま
しい。Rather than the point that the back scattering is further suppressed and a good diffusivity is provided in the transmission direction, for example, the refractive index of the transparent non-colored particles is n 1 and the refractive index of the adhesive layer is n 2. <
It is preferable that the combination satisfy n 1 / n 2 <1.08.
【００１４】粘着層の形成は、例えば粘着性物質と透明
無着色粒子の混合物をカレンダーロール法等による圧延
方式、ドクターブレード法やグラビアロールコータ法等
による塗工方式などの適宜な方式で光学素子等からなる
支持基材に付設する方式、あるいはその支持基材にセパ
レータを用いてそのセパレータ上に前記に準じ粘着層を
形成してそれを光学素子等からなる他の支持基材に移着
する方式などの適宜な方式で行うことができる。The adhesive layer is formed by an appropriate method such as a rolling method of a mixture of an adhesive substance and transparent uncolored particles by a calender roll method or a coating method by a doctor blade method or a gravure roll coater method. Or a method of attaching to a supporting base made of such as, or using a separator on the supporting base, forming an adhesive layer on the separator according to the above, and transferring it to another supporting base made of an optical element or the like. It can be performed by an appropriate method such as a method.
【００１５】粘着層に分散含有させる透明無着色粒子の
量は、粒子投影面積比γが０．１〜１の粘着層となる量
に制御される。すなわちかかる粒子投影面積比γは、粘
着層平面に対する透明無着色粒子の単位面積あたりの投
影面積の総和として定義され、これは粘着層における当
該粒子の分布状態と関係する。その粒子投影面積比γを
前記の範囲とすることで、粘着層を透過する光が複数の
透明無着色粒子で散乱される現象などの当該粒子の相互
作用による光散乱が抑制され、本発明の目的が達成され
る。The amount of the transparent non-colored particles dispersed and contained in the adhesive layer is controlled to an amount such that the projected area ratio γ of the particles becomes 0.1 to 1 in the adhesive layer. That is, the particle projected area ratio γ is defined as the total projected area per unit area of the transparent non-colored particles with respect to the plane of the adhesive layer, which is related to the distribution state of the particles in the adhesive layer. By setting the particle projected area ratio γ within the above range, light scattering due to interaction of the particles, such as a phenomenon in which light transmitted through the adhesive layer is scattered by a plurality of transparent non-colored particles, is suppressed. Objective is achieved.
【００１６】また前記粒子投影面積比γの制御は、光散
乱に対する当該粒子の相互作用の抑制により散乱特性に
影響するファクターを上記散乱パラメータや屈折率比ｎ
1／ｎ2等に絞り込むことができて、それらファクターに
よる散乱特性等の制御性を高めることができ、上記の散
乱パラメータ及び／又は屈折率比ｎ1／ｎ2に基づいて光
散乱性等の光学特性を精度よく制御できる利点なども有
する。Further, the control of the particle projected area ratio γ is performed by controlling factors that affect the scattering characteristics by suppressing the interaction of the particles with respect to light scattering.
1 / n 2, etc., and the controllability of scattering characteristics and the like by these factors can be enhanced. Based on the above-mentioned scattering parameter and / or refractive index ratio n 1 / n 2 , light scattering and the like can be reduced. It also has the advantage that the optical characteristics can be controlled with high accuracy.
【００１７】散乱型粘着層の厚さは、目的とする光散乱
性の強さや接着力などに応じて決定しうる。一般には、
前記粒子投影面積比γを達成する点などより２００μm
以下、就中１〜１００μm、特に５〜５０μmとされる。
なお粘着層が表面に露出する場合には、それを被着体に
接着するまでの間、図例の如くセパレータ１２などで被
覆することが好ましい。The thickness of the scattering-type pressure-sensitive adhesive layer can be determined in accordance with the desired light-scattering strength and adhesive strength. Generally,
200 μm from the point of achieving the particle projected area ratio γ
Hereinafter, it is preferably 1 to 100 μm, particularly 5 to 50 μm.
When the adhesive layer is exposed on the surface, it is preferable to cover the adhesive layer with the separator 12 or the like as shown in the drawing until it is adhered to the adherend.
【００１８】セパレータは、例えば紙やプラスチックフ
ィルム等からなる薄葉体を必要に応じてシリコーン系や
長鎖アクリル系等の適宜な剥離剤で表面処理する方式な
どにより得ることができる。The separator can be obtained, for example, by subjecting a thin leaf made of paper or plastic film or the like to a surface treatment with an appropriate release agent such as a silicone-based or long-chain acrylic-based material as required.
【００１９】光学部材は、図例の如く本発明による散乱
型粘着層１を光学素材２に付設したものとして得ること
ができる。その場合、散乱型粘着層は、光学素材の片面
又は両面、さらに複数の光学層の積層体からなる光学素
材の中間層の適宜な位置に１層又は２層以上を設けるこ
とができる。The optical member can be obtained as shown in the figure, in which the scattering type adhesive layer 1 according to the present invention is attached to the optical material 2. In this case, one or two or more scattering adhesive layers may be provided at appropriate positions on one or both surfaces of the optical material, or on an intermediate layer of the optical material composed of a laminate of a plurality of optical layers.
【００２０】光学部材の形成に用いる光学素材について
は特に限定はなく、例えば液晶表示装置等の最終目的物
を形成する各光学素材などの適宜なものを用いうる。ち
なみにその光学素材の例としては、偏光板や位相差板、
偏光板と位相差板との積層体からなる楕円偏光板や導光
板等のバックライト、反射板や偏光分離板、液晶セルや
アンチグレア板、プリズムシートやレンズシートの如き
光路制御板などがあげられる。また上記した積層体を形
成する光学層やその組合せについても特に限定はなく、
例えば前記した光学素材の積層体などがあげられる。There is no particular limitation on the optical material used for forming the optical member, and for example, an appropriate material such as each optical material forming the final object such as a liquid crystal display device can be used. By the way, examples of the optical material include a polarizing plate, a retardation plate,
Backlights such as elliptically polarizing plates and light guide plates comprising a laminate of a polarizing plate and a retardation plate, reflectors and polarization separation plates, liquid crystal cells and anti-glare plates, and optical path control plates such as prism sheets and lens sheets. . Also, there is no particular limitation on the optical layers and the combination thereof forming the above-described laminate,
For example, a laminate of the above-described optical material can be used.
【００２１】なお光学素材が偏光板と位相差板との積層
体からなる楕円偏光板である場合には、透過光の光学特
性のバラツキを防止する点などより散乱型粘着層は、位
相差板側の外表面に設けることが好ましく、偏光板と位
相差板の積層には、散乱性を示さない接着層を用いるこ
とが好ましい。その接着層の形成には、上記した粘着性
物質の如き適宜な接着剤を用いうる。When the optical material is an elliptically polarizing plate composed of a laminate of a polarizing plate and a retardation plate, the scattering type adhesive layer is formed of a retardation plate in order to prevent variations in the optical characteristics of transmitted light. It is preferable to provide an adhesive layer that does not exhibit scattering properties for lamination of the polarizing plate and the retardation plate. For forming the adhesive layer, an appropriate adhesive such as the above-mentioned tacky substance can be used.
【００２２】前記において、偏光板としては適宜なもの
を用いうる。ちなみにその例としては、ポリビニルアル
コール系や部分ホルマール化ポリビニルアルコール系、
エチレン・酢酸ビニル共重合体系部分ケン化物の如き親
水性高分子のフィルムに、ヨウ素及び／又は二色性染料
を吸着させて延伸処理したもの、ポリビニルアルコール
の脱水処理物やポリ塩化ビニルの脱塩酸処理物の如きポ
リエン配向フィルム等からなる偏光フィルムなどがあげ
られる。In the above, an appropriate polarizing plate can be used. By the way, as examples, polyvinyl alcohol-based and partially formalized polyvinyl alcohol-based,
A film of a hydrophilic polymer such as a partially saponified ethylene-vinyl acetate copolymer, which is drawn by adsorbing iodine and / or a dichroic dye, dehydrated polyvinyl alcohol or dehydrochlorinated polyvinyl chloride A polarizing film made of a polyene oriented film or the like, such as a processed product, may be used.
【００２３】また前記の偏光フィルムの片面又は両面を
透明保護層等で被覆してなる偏光板などもあげられる。
かかる透明保護層等は、偏光フィルムの補強や耐熱性の
向上、偏光フィルムを湿度等より保護することなどの種
々の目的を有するものであってよい。透明保護層は、樹
脂の塗布層や樹脂フィルムのラミネート層などとして形
成することができる。Also, there can be mentioned a polarizing plate obtained by coating one or both sides of the above-mentioned polarizing film with a transparent protective layer or the like.
Such a transparent protective layer or the like may have various purposes such as reinforcing the polarizing film, improving heat resistance, and protecting the polarizing film from humidity and the like. The transparent protective layer can be formed as a resin coating layer, a resin film laminate layer, or the like.
【００２４】一方、位相差板ないし位相差層としても適
宜なものを用いることができ、１／４波長板や１／２波
長板、あるいはその他の位相差特性を示す補償用位相差
板などの適宜な位相差を示すものであってよい。なお前
記の補償用位相差板は、複屈折の波長依存性などを補償
して液晶表示装置の視認性の向上化などを目的とするも
のである。また位相差板は、単層物や２層以上の位相差
層を重畳してなる複層物などの適宜な層形態を有するも
のであってよい。On the other hand, any suitable retardation plate or retardation layer can be used, such as a 波長 wavelength plate, a 波長 wavelength plate, or a compensating retardation plate exhibiting other retardation characteristics. It may show an appropriate phase difference. The compensating retardation plate aims at compensating the wavelength dependence of birefringence and improving the visibility of the liquid crystal display device. The retardation plate may have an appropriate layer form such as a single-layered product or a multilayered product obtained by superposing two or more retardation layers.
【００２５】位相差板等は、例えばカーボネート系やエ
ステル系、イミド系やエーテルスルホン系、スルホン系
やスチレン系、ビニルアルコール系やアリレート系、塩
化ビニル系や塩化ビニリデン系、アクリル系やアミド
系、エポキシ系やセルロース系、ポリエチレンやポリプ
ロピレンの如きポリオレフィン系等のプラスチックの延
伸フィルム、液晶ポリマーの配向フィルムなどの適宜な
材質のものからなるものであってよい。Retardation plates and the like include, for example, carbonates, esters, imides and ethersulfones, sulfones and styrenes, vinyl alcohols and allylates, vinyl chlorides and vinylidene chlorides, acrylics and amides, It may be made of a suitable material such as a stretched film of a plastic such as an epoxy-based or cellulosic, polyolefin-based such as polyethylene or polypropylene, or an oriented film of a liquid crystal polymer.
【００２６】位相差板等の厚さは、目的とする位相差な
どに応じて適宜に決定しうるが、一般には柔軟性や薄型
化などの点より１〜５００μm、就中５〜４００μm、特
に１０〜３００μmとされる。また位相差板は、例えば
熱収縮性フィルムとの接着下に高分子フィルムを延伸処
理したフィルムの如く、厚さ方向の屈折率を制御したも
のなどであってもよい。The thickness of the retardation plate or the like can be appropriately determined according to the intended retardation or the like, but is generally from 1 to 500 μm, particularly from 5 to 400 μm, particularly from the viewpoint of flexibility and thinness. It is 10 to 300 μm. The retardation plate may be one in which the refractive index in the thickness direction is controlled, such as a film obtained by stretching a polymer film while being bonded to a heat-shrinkable film.
【００２７】導光板等のバックライトとしても、例えば
液晶表示装置等で公知のサイドライト型バックライトな
どの適宜なものを用いうる。前記の導光板は通例、上
面、それに対向する下面、及び上下面間の少なくとも一
側端面からなる光入射側面を有する板状物からなり、側
面からの入射光を板内で伝送しつつ拡散や反射、回折や
干渉等により板上下面の一方より出射するようにしたも
のである。As a backlight such as a light guide plate, an appropriate one such as a sidelight type backlight known in a liquid crystal display device or the like can be used. The light guide plate is generally formed of a plate having a light incident side surface including an upper surface, a lower surface opposed thereto, and at least one end surface between upper and lower surfaces, and diffusing while transmitting incident light from the side surface in the plate. The light is emitted from one of the upper and lower surfaces of the plate due to reflection, diffraction, interference, or the like.
【００２８】導光板の形成は、例えば上記の位相差板で
例示した適宜なプラスチックからなる透明又は半透明の
プラスチック板の上面又は下面に、ドット状やストライ
プ状に拡散体を設ける方式や、凹凸構造、就中、プリズ
ムアレイからなる凹凸構造を設ける方式などにより行う
ことができる。The light guide plate may be formed by, for example, providing a diffuser in the form of dots or stripes on the upper or lower surface of a transparent or translucent plastic plate made of a suitable plastic such as the above-mentioned retardation plate, It can be performed by a method of providing a structure, in particular, a concavo-convex structure composed of a prism array.
【００２９】反射板ないし反射層としても、適宜なもの
を用いうる。ちなみにその例としては、金属箔、金属粉
末をバインダで保持した塗工層、その塗工層を支持基材
上に設けてなる反射板、金属の蒸着層やその蒸着層を支
持基材上に設けてなる反射板などがあげられる。As the reflection plate or the reflection layer, an appropriate one can be used. By the way, as an example, a metal foil, a coating layer holding a metal powder with a binder, a reflection plate having the coating layer provided on a support substrate, a metal vapor deposition layer or the metal vapor deposition layer on the support substrate. And a reflection plate provided.
【００３０】偏光分離板ないし偏光分離層としても、適
宜なものを用いうる。ちなみにその例としては、誘電体
の薄膜を重畳した多層膜を介してブリュースター角によ
り自然光を直線偏光からなる反射光と透過光に分離する
ようにしたものや、複屈折性誘電体の薄膜を重畳した多
層膜を介して自然光を直線偏光からなる反射光と透過光
に分離するようにしたもの、あるいはコレステリック液
晶層やそれを反射特性の異なる組合せで重畳して自然光
を左右の円偏光からなる反射光と透過光に分離するよう
にしたものなどがあげられる。As the polarization separation plate or the polarization separation layer, an appropriate one can be used. By the way, as an example, a device that separates natural light into reflected light and transmitted light composed of linearly polarized light by Brewster angle through a multilayer film on which a dielectric thin film is superimposed, or a birefringent dielectric thin film Natural light is separated into reflected light and transmitted light consisting of linearly polarized light through a superposed multilayer film, or natural light is composed of left and right circularly polarized light by superimposing cholesteric liquid crystal layers and combinations of them with different reflection characteristics One that separates reflected light and transmitted light can be used.
【００３１】液晶セルとしても、適宜なものを用いう
る。ちなみにその例としては、ツイストネマチック液晶
やスーパーツイストネマチック液晶を用いた液晶セル、
非ツイスト系の液晶や二色性染料を液晶中に分散させた
ゲストホスト系の液晶、あるいは強誘電性液晶を用いた
液晶セルなどがあげられ、その駆動方式も適宜なもので
あってよい。As the liquid crystal cell, an appropriate one can be used. For example, liquid crystal cells using twisted nematic liquid crystal or super twisted nematic liquid crystal,
A non-twist type liquid crystal, a guest-host type liquid crystal in which a dichroic dye is dispersed in a liquid crystal, a liquid crystal cell using a ferroelectric liquid crystal, or the like may be used, and the driving method may be an appropriate method.
【００３２】なお上記した光路制御板は、出射光の方向
制御を目的とするものであり、正面方向に集光性を示す
レンズシートや、斜め光の光路を正面方向に変換するプ
リズムシートなどの適宜なものを用いうる。The above-mentioned optical path control plate is intended to control the direction of the emitted light, and includes a lens sheet having a light condensing property in the front direction, a prism sheet for converting the light path of the oblique light to the front direction, and the like. An appropriate one can be used.
【００３３】上記した本発明による散乱型粘着層や光学
部材は、透過型又は反射型の液晶表示装置などの各種装
置の形成に好ましく用いうる。その適用に際しては、本
発明による散乱型粘着層を１層又は２層以上配置するこ
とができる。なお、装置等の形成に際しては、本発明に
よる散乱型粘着層以外の散乱層ないし拡散層を配置する
こともできる。The scattering type adhesive layer and the optical member according to the present invention described above can be preferably used for forming various devices such as a transmission type or a reflection type liquid crystal display device. Upon application, one or more scattering adhesive layers according to the present invention can be arranged. In forming the device and the like, a scattering layer or a diffusion layer other than the scattering adhesive layer according to the present invention can be provided.
【００３４】[0034]
【実施例】実施例１ 屈折率（ｎ1）１．５７、粒度分布中心直径が１．２μm
で可視光に対する散乱パラメータαが約７の透明無着色
粒子をアクリル系粘着剤と混合して、それをポリカーボ
ネートの延伸フィルムからなる位相差が１４０nm、厚さ
が６０μmの位相差板に塗布し、屈折率（ｎ2）１．４
８、厚さ２５μmの透明なアクリル系粘着層内に前記の
透明無着色粒子を１．５重量％の割合で分散含有する光
学部材を得た。EXAMPLES Example 1 Refractive index (n 1 ) 1.57, particle size distribution center diameter 1.2 μm
In the transparent light-colored particles having a scattering parameter α for visible light of about 7 are mixed with an acrylic pressure-sensitive adhesive, and the resultant is applied to a retardation plate having a retardation of 140 nm made of a stretched polycarbonate film and a thickness of 60 μm, Refractive index (n 2 ) 1.4
8. An optical member was obtained in which the transparent uncolored particles were dispersed and contained in a transparent acrylic pressure-sensitive adhesive layer having a thickness of 25 μm at a ratio of 1.5% by weight.
【００３５】前記の散乱型アクリル系粘着層は、粒子投
影面積比γが約０．５で、屈折率比（ｎ1／ｎ2）が１．
０６であり（以下同じ）、その光学部材は、後方散乱や
回折散乱を殆ど示さず、ヘイズが４０％で良好な散乱特
性を示した。The scattering type acrylic pressure-sensitive adhesive layer has a particle projected area ratio γ of about 0.5 and a refractive index ratio (n 1 / n 2 ) of 1.
06 (the same applies hereinafter), and the optical member showed almost no backscattering or diffraction scattering, and showed good scattering characteristics with a haze of 40%.
【００３６】比較例１ 屈折率（ｎ1）１．６３、粒度分布中心直径が５０μmで
可視光に対する散乱パラメータαが約３００の透明ガラ
ス粒子を用い、その含有量が１．５重量％で厚さが１０
０μmのアクリル系粘着層としたほかは実施例１に準じ
て光学部材を得た。その散乱型アクリル系粘着層は、粒
子投影面積比γが約０．０５で屈折率比（ｎ1／ｎ2）が
１．１０であり、その光学部材は大きい後方散乱を示し
て、液晶表示装置への適用が困難であった。Comparative Example 1 Transparent glass particles having a refractive index (n 1 ) of 1.63, a particle diameter distribution center diameter of 50 μm, and a scattering parameter α for visible light of about 300 were used. Saga 10
An optical member was obtained in the same manner as in Example 1 except that an acrylic adhesive layer having a thickness of 0 μm was used. The scattering type acrylic pressure-sensitive adhesive layer has a particle projected area ratio γ of about 0.05 and a refractive index ratio (n 1 / n 2 ) of 1.10. It was difficult to apply to the device.
【００３７】比較例２ 透明無着色粒子の含有量が５重量％で厚さが２３μmで
あり、粒子投影面積比γが約１．４のアクリル系粘着層
としたほかは実施例１に準じて光学部材を得た。この光
学部材は、ヘイズが９０％以上の白濁物であり、強い後
方散乱を示して、液晶表示装置への適用が困難であっ
た。Comparative Example 2 The procedure of Example 1 was repeated except that the content of the transparent non-colored particles was 5% by weight, the thickness was 23 μm, and the projected area ratio γ of the particles was about 1.4. An optical member was obtained. This optical member was a cloudy substance having a haze of 90% or more, exhibited strong backscattering, and was difficult to apply to a liquid crystal display device.
【００３８】比較例３ 屈折率（ｎ1）１．５９、粒度分布中心直径が６μmで可
視光に対する散乱パラメータαが約３５の透明無着色粒
子を用いてその含有量が２重量％で厚さが２３μmのア
クリル系粘着層としたほかは実施例１に準じて光学部材
を得た。なおその散乱型アクリル系粘着層は、、粒子投
影面積比γが約０．１で屈折率比（ｎ1／ｎ2）が１．０
７であり、その光学部材はヘイズが４０％程度であった
が、強い回折散乱による干渉色を示して、液晶表示装置
への適用が困難であった。COMPARATIVE EXAMPLE 3 Transparent uncolored particles having a refractive index (n 1 ) of 1.59, a particle size distribution center diameter of 6 μm, and a scattering parameter α for visible light of about 35, a content of 2% by weight and a thickness of 2% An optical member was obtained in the same manner as in Example 1 except that the acrylic adhesive layer had a thickness of 23 μm. The scattering acrylic pressure-sensitive adhesive layer has a particle projected area ratio γ of about 0.1 and a refractive index ratio (n 1 / n 2 ) of 1.0.
The optical member had a haze of about 40%, but exhibited an interference color due to strong diffraction and scattering, and was difficult to apply to a liquid crystal display device.
【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.
１：散乱型粘着層 １１：透明無着色粒子 ２：光学素材 ２１：位相差板 ２３：偏光板 1: scattering type adhesive layer 11: transparent uncolored particles 2: optical material 21: retardation plate 23: polarizing plate
Claims (7)
き、式：α＝πＤ／λにて定義される散乱パラメータα
が１〜２０の透明無着色粒子を光透過性の粘着層に、そ
の粘着層平面に対する前記透明無着色粒子の単位面積あ
たりの投影面積の総和として定義される粒子投影面積比
γが０．１〜１となる状態に分散含有させたことを特徴
とする散乱型粘着層。When the particle diameter is D and the wavelength of incident light is λ, a scattering parameter α defined by the following equation: α = πD / λ
The transparent non-colored particles having a light-transmitting pressure-sensitive adhesive layer having a particle projected area ratio γ defined as the sum of the projected areas per unit area of the transparent non-colored particles with respect to the plane of the pressure-sensitive adhesive layer. (1) a scattering-type pressure-sensitive adhesive layer, which is dispersed and contained in a state of
折率をｎ1、粘着層の屈折率をｎ2として、式：０．９２
＜ｎ1／ｎ2＜１．０８を満足する散乱型粘着層。2. The method according to claim 1, wherein the refractive index of the transparent non-colored particles is n 1 , and the refractive index of the adhesive layer is n 2.
A scattering-type pressure-sensitive adhesive layer satisfying <n 1 / n 2 <1.08.
０μmである散乱型粘着層。3. The method according to claim 1, wherein the layer thickness is 5 to 5.
A scattering adhesive layer having a thickness of 0 μm.
ル系粘着剤からなる散乱型粘着層。4. The scattering pressure-sensitive adhesive layer according to claim 1, wherein the pressure-sensitive adhesive layer comprises an acrylic pressure-sensitive adhesive.
４に記載の散乱型粘着層を付設してなることを特徴とす
る光学部材。5. An optical material comprising at least one layer.
An optical member comprising the scattering type pressure-sensitive adhesive layer according to 4 attached thereto.
位相差板又は偏光板と位相差板との積層体からなる楕円
偏光板である光学部材。6. The optical material according to claim 5, wherein the optical material is a polarizing plate,
An optical member which is an elliptically polarizing plate comprising a retardation plate or a laminate of a polarizing plate and a retardation plate.
板である場合に、位相差板側の外表面に散乱型粘着層が
位置する光学部材。7. The optical member according to claim 6, wherein when the optical material is an elliptically polarizing plate, the scattering adhesive layer is located on the outer surface on the side of the retardation plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5621098A JPH11237502A (en) | 1998-02-20 | 1998-02-20 | Scattering type tacky adhesive layer and optical member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5621098A JPH11237502A (en) | 1998-02-20 | 1998-02-20 | Scattering type tacky adhesive layer and optical member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11237502A true JPH11237502A (en) | 1999-08-31 |
Family
ID=13020756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5621098A Pending JPH11237502A (en) | 1998-02-20 | 1998-02-20 | Scattering type tacky adhesive layer and optical member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11237502A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000058764A1 (en) * | 1999-03-31 | 2000-10-05 | Nippon Mitsubishi Oil Corporation | Optically anisotropic device |
| WO2001013147A1 (en) * | 1999-08-18 | 2001-02-22 | Nitto Denko Corporation | Diffusion polarizing member and liquid crystal display |
| JP2002090514A (en) * | 2000-09-14 | 2002-03-27 | Nitto Denko Corp | Translucent reflecting plate, translucent polarizing plate and liquid crystal display using the same |
| JP2002212526A (en) * | 2001-01-23 | 2002-07-31 | Nitto Denko Corp | Adhesive type optical film |
| WO2019205616A1 (en) * | 2018-04-25 | 2019-10-31 | 京东方科技集团股份有限公司 | Optical film, backlight module comprising optical film, and display apparatus |
-
1998
- 1998-02-20 JP JP5621098A patent/JPH11237502A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000058764A1 (en) * | 1999-03-31 | 2000-10-05 | Nippon Mitsubishi Oil Corporation | Optically anisotropic device |
| KR100673815B1 (en) * | 1999-03-31 | 2007-01-24 | 니폰 오일 코포레이션 (신 니혼 세키유 가부시키 가이샤) | Optically anisotropic device |
| WO2001013147A1 (en) * | 1999-08-18 | 2001-02-22 | Nitto Denko Corporation | Diffusion polarizing member and liquid crystal display |
| US6809782B1 (en) | 1999-08-18 | 2004-10-26 | Nitto Denko Corporation | Diffusing polarizing member and liquid crystal display |
| JP2002090514A (en) * | 2000-09-14 | 2002-03-27 | Nitto Denko Corp | Translucent reflecting plate, translucent polarizing plate and liquid crystal display using the same |
| JP2002212526A (en) * | 2001-01-23 | 2002-07-31 | Nitto Denko Corp | Adhesive type optical film |
| WO2019205616A1 (en) * | 2018-04-25 | 2019-10-31 | 京东方科技集团股份有限公司 | Optical film, backlight module comprising optical film, and display apparatus |
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