JP2002022960A - Polarizing member, surface light source and liquid crystal display device - Google Patents
Polarizing member, surface light source and liquid crystal display deviceInfo
- Publication number
- JP2002022960A JP2002022960A JP2000212173A JP2000212173A JP2002022960A JP 2002022960 A JP2002022960 A JP 2002022960A JP 2000212173 A JP2000212173 A JP 2000212173A JP 2000212173 A JP2000212173 A JP 2000212173A JP 2002022960 A JP2002022960 A JP 2002022960A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- layer
- polarizing member
- light
- 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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- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【発明の技術分野】本発明は、帯電しにくくて高輝度の
液晶表示装置を形成しうる偏光部材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing member which is hardly charged and can form a high-brightness liquid crystal display device.
【０００２】[0002]
【発明の背景】従来、液晶表示装置等の高輝度化を目的
にバックライトを形成するサイドライト型導光板の上に
グランジャン配向のコレステリック液晶層と１／４波長
板からなる偏光部材を配置したものが知られていた。こ
れは前記のコレステリック液晶層が示す入射自然光を反
射光と透過光として左右の円偏光に分離する性質を利用
して、導光板による出射光を円偏光化しそれを１／４波
長板を介し直線偏光化して偏光板に供給することにより
偏光板による吸収ロスを抑制して輝度を向上させるよう
にしたものであり、前記の反射円偏光を反射層を介し反
転させて更に輝度の向上を図る場合もある。BACKGROUND OF THE INVENTION Conventionally, a polarizing member comprising a cholesteric liquid crystal layer having a Grand Jean orientation and a quarter-wave plate is disposed on a side light type light guide plate for forming a backlight for the purpose of increasing the brightness of a liquid crystal display device or the like. What was done was known. This utilizes the property of the above-mentioned cholesteric liquid crystal layer, which separates incident natural light into left and right circularly polarized light as reflected light and transmitted light, and converts the outgoing light from the light guide plate into a linearly polarized light through a quarter-wave plate. By polarizing the light and supplying it to the polarizing plate, the absorption loss by the polarizing plate is suppressed to improve the luminance.In the case where the reflected circularly polarized light is inverted through the reflective layer to further improve the luminance. There is also.
【０００３】しかしながら、従来の偏光部材ではそれに
設けた表面保護フィルムを剥離する際や取扱時の摩擦等
で静電気が発生して帯電しやすく、液晶表示装置等に適
用した場合に静電気障害を生じやすい問題点があった。
またバックライト上に配置した際に平滑性に優れるため
部分的に密着して視認性を阻害する原因となりやすく、
導光板上に拡散光を正面方向に集光するプリズムシート
等の集光シートを配置したバックライトとした場合にそ
の部分密着による視認阻害が特に発生しやすい問題点も
あった。However, in the conventional polarizing member, static electricity is easily generated when the surface protective film provided on the polarizing member is peeled off or friction is caused during handling, and thus, when it is applied to a liquid crystal display device or the like, it tends to cause static electricity damage. There was a problem.
In addition, when placed on the backlight, it has excellent smoothness, so it is likely to partially adhere and hinder visibility,
In the case where a backlight in which a condensing sheet such as a prism sheet for condensing diffused light in the front direction is arranged on a light guide plate, there is also a problem that visual impairment is particularly likely to occur due to partial adhesion.
【０００４】[0004]
【発明の技術的課題】本発明は、帯電しにくくて輝度と
視角特性に優れる液晶表示装置を形成でき、バックライ
トとの密着を防止しうる偏光部材の開発を課題とする。SUMMARY OF THE INVENTION An object of the present invention is to develop a polarizing member which can form a liquid crystal display device which is hardly charged and which has excellent luminance and viewing angle characteristics, and which can prevent adhesion to a backlight.
【０００５】[0005]
【課題の解決手段】本発明は、グランジャン配向のコレ
ステリック液晶層の片側又は両側に１／４波長板、二色
性偏光板及び帯電防止能を有する光拡散層を少なくとも
有することを特徴とする偏光部材、及びその偏光部材を
用いてなることを特徴とする面光源と液晶表示装置を提
供するものである。The present invention is characterized in that at least one side or both sides of a cholesteric liquid crystal layer having a Grand Jean orientation has a quarter-wave plate, a dichroic polarizing plate and a light diffusion layer having an antistatic function. A polarizing member, and a surface light source and a liquid crystal display device characterized by using the polarizing member.
【０００６】[0006]
【発明の効果】帯電防止能を有する光拡散層の付与で視
角特性の改善機能を付加しつつ、表面保護フィルムを剥
離する際や取扱時の摩擦等で発生する静電気を抑制して
帯電やそれによるゴミ付着を防止でき、それを液晶表示
装置等に適用した場合に静電気障害の発生を防止できて
視角特性も改善することができる。特にその場合に帯電
防止能を有する表面凹凸型の光拡散層をコレステリック
液晶層の外表面に凹凸面を外側として付設して適用した
構造とすることにより、偏光部材の全体で一層の帯電防
止能を有する光拡散層を設けることで充分な帯電防止効
果を発現させることができて輝度の低下も抑制でき、バ
ックライトとの密着も防止できて偏光部材の製造効率に
も優れている。二層や三層以上の帯電防止能を有する光
拡散層を設ける構造では界面反射による反射損が増大し
て輝度向上の利点が発揮されにくくなる。According to the present invention, a light diffusion layer having an antistatic function is added to improve the viewing angle characteristics, and at the same time, the static electricity generated by peeling off the surface protective film or friction during handling is suppressed and the charging and discharging are performed. Dust can be prevented, and when it is applied to a liquid crystal display device or the like, the occurrence of electrostatic interference can be prevented, and the viewing angle characteristics can be improved. In particular, in this case, the surface of the cholesteric liquid crystal layer is provided with an uneven surface type light diffusion layer having an antistatic function by applying the uneven surface to the outside, thereby further improving the antistatic function of the entire polarizing member. By providing a light diffusing layer having the above, a sufficient antistatic effect can be exerted, a decrease in luminance can be suppressed, adhesion to a backlight can be prevented, and manufacturing efficiency of a polarizing member is excellent. In a structure in which two or three or more light diffusion layers having an antistatic function are provided, reflection loss due to interfacial reflection increases, and the advantage of improving brightness is hardly exhibited.
【０００７】[0007]
【発明の実施形態】本発明による偏光部材は、グランジ
ャン配向のコレステリック液晶層の片側又は両側に１／
４波長板、二色性偏光板及び帯電防止能を有する光拡散
層を少なくとも有するものよりなる。その例を図１に示
した。１がコレステリック液晶層、２が１／４波長板、
３が二色性偏光板、４が帯電防止能を有する光拡散層で
あり、５は粘着層、６は表面保護フィルムである。また
４１は光拡散層４における凹凸表面である。BEST MODE FOR CARRYING OUT THE INVENTION A polarizing member according to the present invention comprises 1 / two sides of a cholesteric liquid crystal layer having a Grand Jean orientation.
It comprises at least a four-wavelength plate, a dichroic polarizing plate and a light diffusion layer having an antistatic function. An example is shown in FIG. 1 is a cholesteric liquid crystal layer, 2 is a 波長 wavelength plate,
Reference numeral 3 denotes a dichroic polarizing plate, 4 denotes a light diffusion layer having an antistatic function, 5 denotes an adhesive layer, and 6 denotes a surface protective film. Reference numeral 41 denotes an uneven surface of the light diffusion layer 4.
【０００８】グランジャン配向のコレステリック液晶層
については、特に限定はなく、入射自然光を左右一方の
円偏光を透過し他方を反射する特性を示す適宜なものを
用いうる。かかる反射・透過特性を示すコレステリック
液晶層を用いることにより、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、それを偏
光板に吸収されにくい状態で供給して液晶表示等に利用
しうる光量の増大を図って輝度を向上させることができ
る。There is no particular limitation on the cholesteric liquid crystal layer of the Grand Jean orientation, and an appropriate material exhibiting the characteristic of transmitting incident natural light on one of left and right circularly polarized lights and reflecting the other can be used. By using a cholesteric liquid crystal layer exhibiting such reflection / transmission characteristics, light from a light source such as a backlight is made incident to obtain transmitted light in a predetermined polarization state, and the transmitted light is supplied to a polarizing plate in a state where it is hardly absorbed by a liquid crystal. Brightness can be improved by increasing the amount of light available for display and the like.
【０００９】また前記において、コレステリック液晶層
による反射光を反射層等を介し反転させてコレステリッ
ク液晶層に再入射させると、その一部又は全部が所定偏
光状態の光として透過しうることより、その反射光を利
用してコレステリック液晶層を透過する光を増量させて
液晶表示等の輝度をより向上させることができる。In the above, when the light reflected by the cholesteric liquid crystal layer is inverted through the reflection layer or the like and re-enters the cholesteric liquid crystal layer, part or all of the light can be transmitted as light of a predetermined polarization state. By utilizing the reflected light, the amount of light transmitted through the cholesteric liquid crystal layer can be increased to further improve the brightness of a liquid crystal display or the like.
【００１０】コレステリック液晶層は、グランジャン配
向の螺旋ピッチが相違するもの、従って反射波長が相違
するものの組合せにて２層又は３層以上を重畳した配置
構造を有するものであってもよい。かかる重畳化にて可
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。グランジャン配向の螺旋ピッチが
相違するコレステリック液晶層の重畳に際しては、光利
用効率の向上、ひいては輝度向上の点よりその螺旋ピッ
チが大小の順序通りとなるように重畳することが好まし
く、その場合には重畳体の螺旋ピッチが小さい側に１／
４波長板を配置することが斜視による着色低減等の点よ
り好ましい。The cholesteric liquid crystal layer may have a configuration in which two or three or more layers are overlapped in a combination of those having different helical pitches of the Grandian orientation and therefore different reflection wavelengths. With such superimposition, it is possible to obtain circularly polarized light that reflects in a wide wavelength range such as the visible light range, and based on this, it is possible to obtain transmitted circularly polarized light in a wide wavelength range. When superimposing cholesteric liquid crystal layers having different helical pitches of the Grandian orientation, it is preferable to superimpose the cholesteric liquid crystal layers so that the helical pitches are in the order of magnitude from the viewpoint of improving light use efficiency and, consequently, improving brightness. Is 1 /
It is preferable to dispose a four-wavelength plate from the viewpoint of, for example, reducing coloration due to perspective.
【００１１】前記の反射・透過特性を示すコレステリッ
ク液晶層は、液晶ポリマーフィルムなどとして得ること
もできるが、一般には透明基材上にラビング処理等によ
る配向膜を介してグランジャン配向させた液晶ポリマー
層などとして得ることができる。また重畳層は、重ね塗
り方式などにより形成することができる。The cholesteric liquid crystal layer exhibiting the above-mentioned reflection and transmission characteristics can be obtained as a liquid crystal polymer film or the like. It can be obtained as a layer or the like. The superposed layer can be formed by a recoating method or the like.
【００１２】前記の透明基材を形成する材料については
特に限定はないが一般にはポリマーが用いられる。その
ポリマーの例としては、二酢酸セルロースや三酢酸セル
ロースの如きセルロース系ポリマー、ポリエチレンテレ
フタレートやポリエチレンナフタレートの如きポリエス
テル系ポリマー、ポリカーボネート系ポリマーやポリメ
チルメタクリレートの如きアクリル系ポリマー、ポリス
チレンやアクリロニトリル・スチレン共重合体の如きス
チレン系ポリマー、ポリエチレンやポリプロピレン、シ
クロ系ないしノルボルネン構造を有するポリオレフィン
やエチレン・プロピレン共重合体の如きオレフィン系ポ
リマー、塩化ビニル系ポリマー、ナイロンや芳香族ポリ
アミドの如きアミド系ポリマーがあげられる。The material for forming the transparent substrate is not particularly limited, but generally a polymer is used. Examples of the polymer include cellulosic polymers such as cellulose diacetate and cellulose triacetate; polyester polymers such as polyethylene terephthalate and polyethylene naphthalate; acrylic polymers such as polycarbonate polymers and polymethyl methacrylate; polystyrene and acrylonitrile / styrene. Styrene polymers such as copolymers, polyethylene and polypropylene, polyolefins having a cyclo or norbornene structure, olefin polymers such as ethylene / propylene copolymers, vinyl chloride polymers, and amide polymers such as nylon and aromatic polyamides. can give.
【００１３】またイミド系ポリマーやスルホン系ポリマ
ー、ポリエーテルスルホン系ポリマーやポリエーテルエ
ーテルケトン系ポリマー、ポリフェニレンスルフィド系
ポリマーやビニルアルコール系ポリマー、塩化ビニリデ
ン系ポリマーやビニルブチラール系ポリマー、アリレー
ト系ポリマーやポリオキシメチレン系ポリマー、エポキ
シ系ポリマーや前記ポリマーのブレンド物、あるいはポ
リエステル系やアクリル系、ウレタン系やアミド系、シ
リコーン系やエポキシ系等の熱や紫外線照射等で硬化す
るポリマーなども前記透明基材の形成に用いうる。就中
セルロース系フィルムの如く等方性に優れる、ないし複
屈折の少ない透明基材が好ましく用いられる。Further, imide polymers, sulfone polymers, polyethersulfone polymers, polyetheretherketone polymers, polyphenylene sulfide polymers, vinyl alcohol polymers, vinylidene chloride polymers, vinyl butyral polymers, arylate polymers, Oxymethylene-based polymers, epoxy-based polymers and blends of the above-mentioned polymers, and polyester-based, acrylic-based, urethane-based and amide-based, silicone-based and epoxy-based polymers and the like that are cured by heat or ultraviolet irradiation, etc. are also used as the transparent substrate. Can be used to form In particular, a transparent substrate having excellent isotropy or low birefringence, such as a cellulose film, is preferably used.
【００１４】一方、コレステリック液晶層の片側又は両
側に配置する１／４波長板は、コレステリック液晶層に
よる円偏光からなる反射光又は／及び透過光を直線偏光
化することを目的とし、これにより偏光板をその透過軸
が１／４波長板を透過した直線偏光の振動面に対して可
及的に一致するよう配置することで吸収ロスを防止して
より輝度を高めることができる。１／４波長板として
は、各種ポリマーの延伸フィルム等からなる複屈折性フ
ィルム、ディスコチック系やネマチック系の如き液晶ポ
リマーの配向フィルム、その配向液晶層を透明基材上に
支持したものなどの従来に準じた適宜なものを用いう
る。On the other hand, the quarter-wave plate disposed on one side or both sides of the cholesteric liquid crystal layer aims at linearly polarizing the reflected light and / or transmitted light consisting of circularly polarized light by the cholesteric liquid crystal layer. By arranging the plate so that its transmission axis coincides as closely as possible with the vibration plane of the linearly polarized light transmitted through the quarter-wave plate, absorption loss can be prevented and the luminance can be further increased. Examples of the quarter-wave plate include birefringent films composed of stretched films of various polymers, oriented films of liquid crystal polymers such as discotic and nematic, and those in which the oriented liquid crystal layer is supported on a transparent substrate. Appropriate conventional ones can be used.
【００１５】なお前記の複屈折性フィルムを形成するポ
リマーは、上記した透明基材で例示したものなどの適宜
なものであってよい。就中、例えばポリエステル系ポリ
マーやポリエーテルエーテルケトンの如く結晶性に優れ
るポリマーが好ましく用いうる。延伸フィルムは、一軸
や二軸等の適宜な方式で処理したものであってよい。ま
た熱収縮性フィルムとの接着下に収縮力又は／及び延伸
力を付与する方式などによりフィルムの厚さ方向の屈折
率を制御した複屈折性フィルムなどであってもよい。The polymer forming the birefringent film may be an appropriate polymer such as those exemplified for the transparent substrate described above. Above all, a polymer having excellent crystallinity, such as a polyester-based polymer or polyetheretherketone, can be preferably used. The stretched film may be processed by an appropriate method such as uniaxial or biaxial. Further, a birefringent film in which the refractive index in the thickness direction of the film is controlled by a method of applying a contraction force and / or a stretching force while adhering to the heat-shrinkable film may be used.
【００１６】１／４波長板は、位相差等の光学特性の制
御を目的に２層以上の位相差層を積層したものであって
もよい。ちなみに波長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ものを得ることが
できる。色ムラ防止等の点より好ましく用いうる１／４
波長板は、面内の主屈折率をｎx、ｎy、厚さ方向の主屈
折率をｎzとしたとき、式：（ｎx−ｎz）／（ｎx−ｎ
y）で定義されるＮｚが−０．５〜−２．５のものであ
る。The quarter-wave plate may be formed by laminating two or more retardation layers for the purpose of controlling optical characteristics such as retardation. Incidentally, a phase difference layer functioning as a 波長 wavelength plate and a phase difference layer exhibiting other phase difference characteristics, for example, a phase difference layer functioning as a 板 wavelength plate are superimposed on monochromatic light such as light having a wavelength of 550 nm. According to such a method, a plate functioning as a quarter-wave plate in a wide wavelength range such as a visible light region can be obtained. 1/4 which can be preferably used from the viewpoint of preventing color unevenness and the like
When the in-plane main refractive index is nx and ny and the main refractive index in the thickness direction is nz, the wave plate has the formula: (nx-nz) / (nx-n).
Nz defined by y) is -0.5 to -2.5.
【００１７】二色性偏光板は、液晶表示等を達成するた
めの直線偏光を得ることを目的とする。その偏光板には
所定偏光軸の直線偏光を透過して他の光は吸収する適宜
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。一般には偏光フィルムやその片面又は両面を透明
保護層で保護したものなどが用いられる。ちなみにその
偏光フィルムの例としては、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処理したものなどがあげられ
る。The purpose of the dichroic polarizing plate is to obtain linearly polarized light for achieving a liquid crystal display or the like. As the polarizing plate, an appropriate one that transmits linearly polarized light having a predetermined polarization axis and absorbs other light can be used, and the type thereof is not particularly limited. Generally, a polarizing film or a film having one or both surfaces protected by a transparent protective layer is used. Incidentally, as an example of the polarizing film, iodine and / or a dichroic dye is applied to 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 include those that have been adsorbed and stretched.
【００１８】また偏光フィルムの片面又は両面に必要に
応じて設ける透明保護層は、上記の透明基材で例示した
ポリマーなどにて形成することができる。就中、透明性
や機械的強度、熱安定性や水分遮蔽性等に優れるポリマ
ーからなる透明保護層が好ましい。透明保護層は、ポリ
マー液の塗布方式やフィルムとしたものの接着積層方式
などの適宜な方式で形成することができる。The transparent protective layer provided on one side or both sides of the polarizing film, if necessary, can be formed of the polymer exemplified for the above transparent substrate. Above all, a transparent protective layer made of a polymer having excellent transparency, mechanical strength, heat stability, moisture shielding property and the like is preferable. The transparent protective layer can be formed by an appropriate method such as a method of applying a polymer liquid or an adhesive lamination method of a film.
【００１９】帯電防止能を有する光拡散層は、静電気に
よる帯電の防止と、バックライトからの光のコントロー
ルや斜視による着色光を混合同色化して色ムラを防止し
着色を低減することなどによる視角特性の改善等を目的
とする。その形成は、例えば帯電防止剤と光拡散用透明
粒子をポリマーに配合してフィルム化する方式やかかる
配合物を支持フィルムにコートする方式、従来に準じた
光拡散シートに帯電防止剤をコートする方式や蒸着する
方式、また従来に準じた帯電防止フィルムに光拡散用透
明粒子をコートする方式などの適宜な方式にて形成する
ことができる。The light diffusion layer having an antistatic function is used to prevent electrostatic charging, and to control light from a backlight and mix and color colored light from a perspective to prevent color unevenness and reduce coloration. The purpose is to improve the characteristics. The formation is performed by, for example, blending an antistatic agent and transparent particles for light diffusion into a polymer to form a film, coating such a compound on a support film, or coating an antistatic agent on a light diffusion sheet according to a conventional method. It can be formed by an appropriate method such as a method, a method of vapor deposition, or a method of coating a transparent particle for light diffusion on a conventional antistatic film.
【００２０】視認性の向上等の点より好ましい帯電防止
能を有する光拡散層は、従来の防眩層に準じた光拡散性
を示すもの、就中ヘイズ値が７０％以下、特に１〜４０
％のものである。これによれば光の屈折等を制御して液
晶表示装置の正面方向の画質を良好に維持しつつ斜視方
向、就中７０〜８０度の斜視方向での光拡散層に特有の
色付きを緩和することができる。The light diffusing layer having a preferable antistatic property from the viewpoint of improvement in visibility and the like has a light diffusing property similar to the conventional antiglare layer, and has a haze value of 70% or less, particularly 1 to 40.
%belongs to. According to this method, the coloration peculiar to the light diffusing layer in the oblique direction, particularly 70 to 80 degrees, is moderated while controlling the refraction of light and maintaining the image quality in the front direction of the liquid crystal display device in a good state. be able to.
【００２１】帯電防止能を有する光拡散層は、偏光部材
を形成する素材の層間や表面に位置させた内部層や表面
層として一層又は二層以上を設けうる。その好ましい配
置は、図例の如くコレステリック液晶層１の外側に位置
させたものである。またその場合に特に好ましく用いう
る帯電防止能を有する光拡散層４は、図例の如く外表面
側に微細な凹凸構造４１を有するものである。これによ
ればその凹凸面４１を介して偏光部材をバックライト上
に配置できて部分的密着による視認阻害の発生を防止で
き、またその一層の帯電防止能を有する光拡散層の配置
で偏光部材全体の帯電防止を達成でき反射損による輝度
低下を抑制できて偏光部材の製造効率にも優れている。The light diffusion layer having an antistatic function may be provided as one layer or two or more layers as an inner layer or a surface layer located between or on the surfaces of the material forming the polarizing member. The preferred arrangement is that it is located outside the cholesteric liquid crystal layer 1 as shown in the figure. In this case, the light diffusion layer 4 having an antistatic ability, which can be particularly preferably used, has a fine uneven structure 41 on the outer surface side as shown in the figure. According to this, the polarizing member can be disposed on the backlight through the uneven surface 41, thereby preventing the occurrence of visual impediment due to partial adhesion, and the light diffusing layer having a further antistatic ability can be disposed with the polarizing member. It is possible to achieve the whole antistatic property and to suppress the decrease in luminance due to the reflection loss, and it is also excellent in the manufacturing efficiency of the polarizing member.
【００２２】前記した表面凹凸構造型の帯電防止能を有
する光拡散層の形成は、帯電防止剤と光拡散用透明粒子
を配合したポリマー液や、高分子化した帯電防止剤に光
拡散用透明粒子を配合して支持基材に塗工し表面凹凸構
造の層を形成する方式である。その場合、形成する層厚
を５〜１０μm程度とすることで上記したヘイズ値が７
０％以下、就中１〜４０％のものとすることができる。
なお前記の支持基材には上記したコレステリック液晶層
で例示の透明基材などの適宜なものを用いることがで
き、ヘイズ値１０％以下の支持基材がそれに光拡散処理
を施して全体のヘイズ値を制御する点より好ましい。The formation of the light diffusion layer having an antistatic ability of the surface uneven structure type described above can be performed by mixing a polymer liquid containing an antistatic agent and transparent particles for light diffusion or a polymerized antistatic agent with a transparent light diffusion layer. This is a method in which particles are blended and applied to a supporting substrate to form a layer having a surface uneven structure. In this case, the above-mentioned haze value is 7 by setting the thickness of the layer to be formed to about 5 to 10 μm.
It can be 0% or less, especially 1 to 40%.
In addition, as the above-mentioned supporting substrate, an appropriate material such as the transparent substrate exemplified in the above-mentioned cholesteric liquid crystal layer can be used, and a supporting substrate having a haze value of 10% or less is subjected to a light diffusion treatment to give an overall haze. It is preferable to control the value.
【００２３】前記の帯電防止剤としては、例えば第四級
アンモニウム塩やピリジウム塩、アミノ基の如きカチオ
ン性基を有するカチオン系帯電防止剤、スルホン酸塩や
硫酸エステル塩、リン酸エステル塩やホスホン酸塩基の
如きアニオン系帯電防止剤、アミノ酸系化合物やアミノ
硫酸エステル系化合物の如き両性系帯電防止剤、アミノ
アルコール系化合物やグリセリン系化合物、ポリエチレ
ングリコール系化合物の如きノニオン系帯電防止剤等の
各種界面活性剤型帯電防止剤、かかる帯電防止剤を高分
子化したものなどの有機系のものがあげられる。また例
えば酸化スズや酸化インジウム、スズ・インジウム複合
酸化物（ＩＴＯ）や酸化カドミウム、酸化アンチモンの
如き導電性の無機系透明微粒子などもあげられる。Examples of the antistatic agent include a quaternary ammonium salt, a pyridium salt, a cationic antistatic agent having a cationic group such as an amino group, a sulfonate, a sulfate ester salt, a phosphate ester salt, and a phosphonate salt. Various types of anionic antistatic agents such as acid bases, amphoteric antistatic agents such as amino acid compounds and aminosulfate compounds, and nonionic antistatic agents such as amino alcohol compounds, glycerin compounds and polyethylene glycol compounds. Examples thereof include surfactant-type antistatic agents and organic compounds such as those obtained by polymerizing such antistatic agents. In addition, for example, conductive inorganic transparent fine particles such as tin oxide, indium oxide, tin-indium composite oxide (ITO), cadmium oxide, and antimony oxide are also used.
【００２４】また光拡散用の透明粒子には、例えばシリ
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粒子、ポリメチルメタク
リレートやポリウレタン、ポリスチレンやメラミン系樹
脂の如き上記の透明基材で例示したポリマー等からなる
架橋又は未架橋の有機系粒子などの適宜なものを用いう
る。従って帯電防止剤と光拡散を兼ねる透明粒子を用い
ることもできる。The transparent particles for light diffusion include, for example, inorganic particles which may be conductive, such as silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, and antimony oxide, and polymethyl methacrylate. Appropriate materials such as crosslinked or uncrosslinked organic particles made of the above-described polymers exemplified by the transparent base such as polyurethane, polystyrene, and melamine resins can be used. Therefore, transparent particles that also serve as an antistatic agent and light diffusion can be used.
【００２５】帯電防止能を有する光拡散層の形成には１
種又は２種以上の帯電防止剤や光拡散用透明粒子を用い
ることができる。透明性や帯電防止の安定性等に優れる
光拡散層の形成には粒径が可視光の波長以下、就中７０
０nm以下の帯電防止剤、特に無機系透明微粒子が好まし
く用いられる。また帯電防止剤や光拡散用透明粒子を配
合するポリマーとしては紫外線や電子線等で硬化処理し
うる電離放射線硬化型の透明樹脂が好ましく用いられ
る。To form a light diffusion layer having an antistatic function, 1
One or more kinds of antistatic agents and transparent particles for light diffusion can be used. In order to form a light diffusion layer having excellent transparency and antistatic stability, the particle diameter is less than the wavelength of visible light, especially 70%.
Antistatic agents of 0 nm or less, particularly inorganic transparent fine particles, are preferably used. Further, as the polymer in which the antistatic agent and the transparent particles for light diffusion are compounded, an ionizing radiation-curable transparent resin which can be cured by ultraviolet rays or electron beams is preferably used.
【００２６】偏光部材におけるコレステリック液晶層と
１／４波長板と二色性偏光板の配置位置については適宜
に決定しうるが、一般には図例の如く１／４波長板２の
片側にコレステリック液晶層１を配置し、その１／４波
長板の他方側に二色性偏光板３を配置した構造とされ
る。偏光部材の形成に際しては必要に応じてコレステリ
ック液晶層、１／４波長板及び二色性偏光板以外の例え
ば位相差板などの適宜な光学層の１層又は２層以上を適
宜な位置に配置でき、それらの形成層に帯電防止処理を
施すこともできる。The positions of the cholesteric liquid crystal layer, the quarter-wave plate and the dichroic polarizing plate in the polarizing member can be determined as appropriate. In general, as shown in FIG. The layer 1 is arranged, and the dichroic polarizing plate 3 is arranged on the other side of the quarter-wave plate. When forming a polarizing member, one or more suitable optical layers such as a retardation plate other than a cholesteric liquid crystal layer, a quarter-wave plate and a dichroic polarizing plate are arranged at appropriate positions as necessary. These layers may be subjected to an antistatic treatment.
【００２７】前記の位相差板は、液晶セルの複屈折によ
る位相差を補償して表示品位の向上を図ることなどを目
的とし、かかる光学補償用の位相差板は通例、表示品位
の向上の点より二色性偏光板と液晶セルの間に位置する
ように、従って１／４波長板を基準に二色性偏光板を有
する側の表面に配置することが好ましい。光学補償用の
位相差板としては、上記の１／４波長板に準じた複屈折
性フィルムや配向液晶層などからなる適宜な位相差を有
するものが用いられ、位相差等の光学特性の制御を目的
に２層以上の位相差層を積層したものであってもよい。The above-mentioned retardation plate is intended to improve the display quality by compensating for the phase difference due to the birefringence of the liquid crystal cell, and such a retardation plate for optical compensation is usually used to improve the display quality. Therefore, it is preferable that the dichroic polarizing plate be disposed between the dichroic polarizing plate and the liquid crystal cell from the point of view, that is, on the surface having the dichroic polarizing plate with respect to the １ ／ wavelength plate. As the retardation plate for optical compensation, a retardation plate having an appropriate retardation composed of a birefringent film or an oriented liquid crystal layer according to the above-mentioned quarter wavelength plate is used, and control of optical characteristics such as retardation is used. For the purpose, two or more retardation layers may be laminated.
【００２８】また上記した帯電防止能を有する光拡散層
とは別個の帯電防止能を有しない光拡散層を層間や表面
の適宜な位置に１層又は２層以上配置でき、その光拡散
層は、光拡散用の透明粒子を配合した粘着層として形成
することもできる。光拡散型の粘着層よればその光拡散
層を介しコレステリック液晶層や１／４波長板や二色性
偏光板等の偏光部材形成素材を接着一体化でき、別個の
接着層の付設を省略できて薄型化を図りうる利点があ
る。In addition, one or more light diffusion layers having no antistatic function can be arranged at appropriate positions on the interlayer or on the surface separately from the light diffusion layer having the antistatic function described above. Alternatively, it may be formed as an adhesive layer containing transparent particles for light diffusion. According to the light diffusion type adhesive layer, a polarizing member forming material such as a cholesteric liquid crystal layer, a 波長 wavelength plate or a dichroic polarizing plate can be bonded and integrated via the light diffusion layer, and the provision of a separate adhesive layer can be omitted. There is an advantage that the thickness can be reduced.
【００２９】偏光部材は、コレステリック液晶層や１／
４波長板、二色性偏光板や帯電防止能を有する光拡散層
等の各形成素材を単に重ね置いたものであってもよい
が、光軸のズレ防止による品質の安定化や液晶表示装置
の組立効率の向上などの点よりは粘着層等の接着層を介
して積層一体化されていることが好ましい。ちなみに図
例では、コレステリック液晶層１、１／４波長板２、二
色性偏光板３及び帯電防止能を有する光拡散層４がそれ
ぞれ粘着層５を介して接着一体化されている。The polarizing member includes a cholesteric liquid crystal layer and a 1 /
Each material such as a four-wavelength plate, a dichroic polarizing plate, and a light diffusion layer having an antistatic function may be simply laminated, but the quality can be stabilized by preventing the optical axis from shifting, and the liquid crystal display device can be used. It is preferable that they are laminated and integrated via an adhesive layer such as an adhesive layer from the viewpoint of improving the assembling efficiency. Incidentally, in the illustrated example, the cholesteric liquid crystal layer 1, the quarter-wave plate 2, the dichroic polarizing plate 3, and the light diffusion layer 4 having an antistatic function are bonded and integrated via an adhesive layer 5, respectively.
【００３０】粘着層は、例えばアクリル系重合体やシリ
コーン系ポリマー、ポリエステルやポリウレタン、ポリ
エーテルや合成ゴムなどの適宜なポリマーをベースポリ
マーとする粘着剤などの適宜な粘着性物質を用いて形成
することができる。就中アクリル系粘着剤の如く光学的
透明性や耐候性、耐熱性等に優れて熱や湿度の影響で浮
きや剥がれ等を生じにくいものが好ましく用いうる。The adhesive layer is formed by using an appropriate adhesive substance such as an adhesive having an appropriate polymer as a base polymer such as an acrylic polymer, a silicone polymer, polyester, polyurethane, polyether or synthetic rubber. be able to. Among them, those which are excellent in optical transparency, weather resistance, heat resistance and the like and are hardly caused to float or peel off under the influence of heat or humidity, such as acrylic adhesives, can be preferably used.
【００３１】ちなみに前記のアクリル系粘着剤の例とし
ては、メチル基やエチル基やブチル基等の炭素数が２０
以下のアルキル基を有する（メタ）アクリル酸のアルキ
ルエステルと、（メタ）アクリル酸や（メタ）アクリル
酸ヒドロキシエチル等の改良成分からなるアクリル系モ
ノマーを、ガラス転移温度が０℃以下となる組合せにて
共重合してなる、重量平均分子量が１０万以上のアクリ
ル系重合体をベースポリマーとするものなどがあげられ
るが、これに限定されない。Incidentally, examples of the acrylic pressure-sensitive adhesive include those having 20 or more carbon atoms such as a methyl group, an ethyl group and a butyl group.
A combination of an alkyl ester of (meth) acrylic acid having the following alkyl group and an acrylic monomer composed of an improving component such as (meth) acrylic acid or hydroxyethyl (meth) acrylate having a glass transition temperature of 0 ° C. or lower. And an acrylic polymer having a weight average molecular weight of 100,000 or more as a base polymer. However, the present invention is not limited thereto.
【００３２】粘着層の形成は、例えばカレンダーロール
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粘着
性物質をコレステリック液晶層等の形成素材に付設する
方式、あるいはそれに準じてセパレータ上に粘着層を形
成しそれをコレステリック液晶層等の形成素材に移着す
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 applying an adhesive substance to the material for forming the cholesteric liquid crystal layer or the like by an appropriate method such as a rolling method by a calendar roll method or a coating method by a doctor blade method or a gravure roll coater method. Or an appropriate method such as a method of forming an adhesive layer on a separator according to the method and transferring it to a material for forming a cholesteric liquid crystal layer or the like.
【００３３】図例の如く偏光部材の外表面には必要に応
じ液晶セル等の他部材との接着を目的とした粘着層５を
設けることもできる。その粘着層が表面に露出する場合
には実用に供するまでの間、汚染防止等の保護を目的に
その表面をセパレータなどで仮着カバーしておくことも
できる。また偏光部材の形成素材が表面に露出する場合
には、図例の如くその露出表面を表面保護フィルム６に
て接着カバーして傷付き等から保護することもできる。As shown in the figure, an adhesive layer 5 can be provided on the outer surface of the polarizing member for the purpose of bonding to another member such as a liquid crystal cell, if necessary. If the adhesive layer is exposed on the surface, the surface may be temporarily covered with a separator or the like for the purpose of protection such as contamination prevention until practical use. When the material for forming the polarizing member is exposed on the surface, the exposed surface can be adhesively covered with a surface protection film 6 as shown in the figure to protect it from scratches and the like.
【００３４】前記のセパレータや表面保護フィルムは、
偏光部材の実用段階では剥離除去されるものであり、そ
の剥離の際に静電気やそれによるゴミ付着が生じる場合
があるので必要に応じて帯電防止処理したセパレータや
表面保護フィルムを用いうるが、本発明による偏光部材
を用いることでその剥離時やそれ以外の例えば指で触れ
たり擦ったりする際、液晶表示装置の組立時に他の部品
と接触した際などに発生する静電気やそれによるゴミ付
着等も防止することができる。その静電気発生の防止性
等の点よりは偏光部材の表面抵抗値が低いほど好まし
く、就中１０１２Ω／□以下、特に１０９Ω／□以下で
あることが好ましい。The above-mentioned separator and surface protective film are
At the practical stage of the polarizing member, the polarizing member is peeled and removed, and at the time of the peeling, static electricity and dust adhesion may occur.Therefore, an antistatic treated separator or a surface protective film can be used as necessary. By using the polarizing member according to the present invention, at the time of peeling or other touching or rubbing with a finger, for example, static electricity generated at the time of contact with other parts at the time of assembling the liquid crystal display device and adhesion of dust and the like due thereto. Can be prevented. The lower the surface resistance of the polarizing member is, the more preferable it is from the viewpoint of preventing static electricity generation and the like, and it is particularly preferably 10 12 Ω / □ or less, particularly preferably 10 9 Ω / □ or less.
【００３５】偏光部材は、従来に準じた各種の用途に用
いうる。特に輝度の向上等を目的とした面光源や液晶表
示装置の形成に好ましく用いうる。面光源は、例えばサ
イドライト型導光板等の適宜な光源上に偏光部材をその
コレステリック液晶層が光源側となるように配置する方
式などにより形成することができる。また液晶表示装置
は、例えば前記の面光源における偏光部材の偏光板の上
側に適宜な液晶セルを配置する方式などにより形成する
ことができる。The polarizing member can be used for various applications according to the related art. In particular, it can be preferably used for forming a surface light source or a liquid crystal display device for the purpose of improving luminance or the like. The surface light source can be formed by, for example, a method in which a polarizing member is disposed on an appropriate light source such as a side light type light guide plate so that the cholesteric liquid crystal layer is on the light source side. Further, the liquid crystal display device can be formed by, for example, a method in which an appropriate liquid crystal cell is arranged above the polarizing plate of the polarizing member in the above-mentioned surface light source.
【００３６】前記の場合、面光源には導光板等の底面に
光反射層を設けることもでき、また液晶表示装置ではそ
の視認側に偏光板を配置することもできる。その視認側
の偏光板には上記の偏光部材で例示したものなどの適宜
なものを用いることができ、必要に応じその視認側表面
に防眩層や反射防止層などを設けることができる。防眩
層は、表面で反射する外光を散乱させて、また反射防止
層は外光の表面反射を抑制して、表面反射光がギラツキ
等として表示装置透過光の視認を害することの防止など
を目的に施されるものである。従って防眩層と反射防止
層は、その両方を設けて表面反射光による視認阻害防止
のより向上を図ることもできる。In the above case, the surface light source may be provided with a light reflection layer on the bottom surface of a light guide plate or the like, and a liquid crystal display device may be provided with a polarizing plate on its viewing side. As the polarizing plate on the viewing side, an appropriate one such as the above-described polarizing member can be used, and an antiglare layer, an antireflection layer, or the like can be provided on the viewing side surface as needed. The anti-glare layer scatters the external light reflected on the surface, and the anti-reflection layer suppresses the surface reflection of the external light, preventing the surface reflected light from causing glare or the like to impair the visibility of the transmitted light of the display device. It is performed for the purpose. Therefore, both the anti-glare layer and the anti-reflection layer can be provided to further improve the prevention of visual impairment due to surface reflected light.
【００３７】防眩層や反射防止層については、特に限定
はなく前記の機能を示す適宜なものとして形成すること
ができる。ちなみに防眩層は、上記の光拡散層に準じて
光散乱反射性の微細凹凸構造を付与することにより形成
することができる。また反射防止層は、真空蒸着方式や
イオンプレーティング方式、スパッタリング方式等の蒸
着方式やメッキ方式、ゾルゲル方式などの適宜なコート
方式による例えば屈折率の異なる無機酸化物の多層コー
ト膜やフッ素系化合物等の低屈折材料のコート膜等から
なる干渉膜などにより形成することができる。The antiglare layer and the antireflection layer are not particularly limited, and can be formed as appropriate having the above functions. Incidentally, the antiglare layer can be formed by providing a light-scattering / reflecting fine uneven structure according to the above-mentioned light diffusion layer. In addition, the antireflection layer is formed by a vapor deposition method such as a vacuum deposition method, an ion plating method, or a sputtering method, a plating method, or a suitable coating method such as a sol-gel method. It can be formed by an interference film made of a coating film of a low refractive material such as.
【００３８】さらに面光源や液晶表示装置の形成に際し
てはプリズムシートやレンズシート等の集光シート、視
認側の光拡散シートなどの適宜な光学シートの１種又は
２種以上を適宜な位置に配置でき、視認側にも光学補償
用の位相差板を配置することができる。Further, when forming a surface light source or a liquid crystal display device, one or two or more kinds of appropriate optical sheets such as a condensing sheet such as a prism sheet and a lens sheet and a light diffusion sheet on the viewing side are arranged at appropriate positions. The retardation plate for optical compensation can be arranged on the viewing side.
【００３９】[0039]
【実施例】実施例１ 厚さ８０μmの三酢酸セルロースフィルムの上にラビン
グ配向膜を介しコレステリック液晶ポリマーを重畳塗布
し配向処理してなる反射中心波長が７６０nm、６５０n
m、５５０nm又は４３０nmの４層構造からなるコレステ
リック液晶層の反射中心波長４３０nm側に厚さ２５μm
のアクリル系粘着層を介し、Ｎｚが−１．５のポリカー
ボネートからなる１／４波長板を接着し、更にその１／
４波長板の上にアクリル系粘着層を介し二色性偏光板を
接着し、そのコレステリック液晶層の外表面にアクリル
系粘着層を介し帯電防止能を有する光拡散シートを接着
積層した後、その光拡散シートに対し表面保護フィルム
を接着して偏光部材を得た。Example 1 A cholesteric liquid crystal polymer was superimposed on an 80 μm-thick cellulose triacetate film via a rubbing alignment film and subjected to an alignment treatment. The reflection center wavelength was 760 nm and 650 n.
m, 550 nm or 430 nm cholesteric liquid crystal layer with a thickness of 25 μm on the 430 nm side of the reflection center wavelength
A quarter-wave plate made of polycarbonate having an Nz of -1.5 is adhered through an acrylic adhesive layer of
A dichroic polarizing plate is adhered on the four-wavelength plate via an acrylic adhesive layer, and a light diffusion sheet having an antistatic function is adhesively laminated on the outer surface of the cholesteric liquid crystal layer via an acrylic adhesive layer. A polarizing member was obtained by bonding a surface protective film to the light diffusion sheet.
【００４０】なお前記の光拡散シートは、三酢酸セルロ
ースフィルムの片面に金属酸化物微粒子とシリカ粒子を
配合した紫外線硬化型アクリル系樹脂を塗工し硬化処理
して帯電防止能を有する表面凹凸型の光拡散層を形成し
たものであり、その表面抵抗値が１０９Ω／□でヘイズ
値が２１％であり、表面凹凸側を外表面（表面保護フィ
ルム側）とした。The above-mentioned light diffusing sheet is made of a cellulose triacetate film coated on one side with an ultraviolet-curable acrylic resin containing metal oxide fine particles and silica particles, and cured to obtain a surface irregularity type having antistatic ability. Of which the surface resistance was 10 9 Ω / □ and the haze value was 21%, and the surface irregularity side was the outer surface (surface protective film side).
【００４１】比較例１ 帯電防止能を有する光拡散シートを接着積層しないほか
は実施例１に準じて偏光部材を得た。Comparative Example 1 A polarizing member was obtained in the same manner as in Example 1 except that a light diffusion sheet having an antistatic function was not bonded and laminated.
【００４２】比較例２ 偏光部材に代えて、実施例１に準じて形成した帯電防止
能を有する光拡散シートの片面に粘着層を設け、他面に
表面保護フィルムを接着したものを用いた。Comparative Example 2 Instead of the polarizing member, a light diffusion sheet having antistatic ability formed according to Example 1 was provided with an adhesive layer on one surface and a surface protective film adhered on the other surface.
【００４３】評価試験 実施例、比較例で得た偏光部材又は光拡散シートを粘着
層を介しガラス板に接着してその表面保護フィルムを剥
離し、その際の静電気量を調べた。またそれをガラス板
側を上側にして面光源上に配置し、輝度計（トプコン社
製、ＢＭ７）にて正面輝度を調べた。従って偏光部材で
はそのコレステリック液晶層が光源側となる。さらに斜
視した場合の色付きの様子を目視観察した。Evaluation Test The polarizing member or the light diffusing sheet obtained in each of Examples and Comparative Examples was adhered to a glass plate via an adhesive layer, the surface protective film was peeled off, and the amount of static electricity at that time was examined. Further, it was arranged on a surface light source with the glass plate side facing upward, and the front luminance was examined with a luminance meter (BM7, manufactured by Topcon Corporation). Therefore, in the polarizing member, the cholesteric liquid crystal layer is on the light source side. Further, the appearance of coloring when the user was further oblique was visually observed.
【００４４】前記の結果を次表に示した。 実施例１ 比較例１ 比較例２ 静電気量（ｋＷ） ０．１ ２０ ０．１ 正面輝度(cd／m２） ２１０８ ２１１０ １３５０ 斜視での色付き なし あり なしThe results are shown in the following table. Example 1 Comparative Example 1 Comparative Example 2 Static Electricity (kW) 0.1 20 0.1 Frontal Brightness (cd / m 2 ) 2108 2110 1350 Coloring in perspective No Yes No
【図１】実施例の断面図FIG. 1 is a sectional view of an embodiment.
１：コレステリック液晶層 ２：１／４波長板 ３：二
色性偏光板 ４：帯電防止能を有する光拡散層（４１：表面凹凸）
５：粘着層1: cholesteric liquid crystal layer 2: quarter wavelength plate 3: dichroic polarizing plate 4: light diffusion layer having antistatic ability (41: surface unevenness)
5: adhesive layer
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2H049 BA02 BA05 BA06 BA07 BA43 BB03 BB49 BB63 BB65 BB67 2H091 FA07X FA07Z FA31X FA31Z FB02 LA07 LA16 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H049 BA02 BA05 BA06 BA07 BA43 BB03 BB49 BB63 BB65 BB67 2H091 FA07X FA07Z FA31X FA31Z FB02 LA07 LA16
Claims (11)
層の片側又は両側に１／４波長板、二色性偏光板及び帯
電防止能を有する光拡散層を少なくとも有することを特
徴とする偏光部材。1. A polarizing member comprising at least a quarter-wave plate, a dichroic polarizing plate and a light diffusion layer having an antistatic function on one or both sides of a cholesteric liquid crystal layer having a Grandian orientation.
光拡散層が内部層又は表面層として位置し、その表面抵
抗値が１０１２Ω／□以下である偏光部材。2. The polarizing member according to claim 1, wherein the light diffusion layer having an antistatic function is located as an inner layer or a surface layer, and has a surface resistance of 10 12 Ω / □ or less.
有する光拡散層がヘイズ値１０％以下の支持基材の表面
に光拡散処理を施したものであり、ヘイズ値が１〜４０
％のものである偏光部材。3. The light-diffusing layer according to claim 1, wherein the light-diffusing layer having an antistatic property is obtained by subjecting a surface of a supporting substrate having a haze value of 10% or less to a light-diffusion treatment, and having a haze value of 1 to 40.
% Polarizing member.
片側に粘着層を介してコレステリック液晶層が接着さ
れ、その１／４波長板の他方側に二色性偏光板が粘着層
を介し接着されて、かつ帯電防止能を有する光拡散層が
前記コレステリック液晶層の外側に付設されてなる偏光
部材。4. The cholesteric liquid crystal layer according to claim 1, wherein a cholesteric liquid crystal layer is adhered to one side of the 板 wavelength plate via an adhesive layer, and a dichroic polarizing plate is attached to the other side of the 波長 wavelength plate. A polarizing member comprising a light diffusion layer bonded to the cholesteric liquid crystal layer and having an antistatic function, and the light diffusion layer is provided outside the cholesteric liquid crystal layer.
液晶層がグランジャン配向の螺旋ピッチが相違するもの
の重畳体からなる偏光部材。5. The polarizing member according to claim 1, wherein the cholesteric liquid crystal layer is formed of a superposed body, although the helical pitch of the Grandian orientation is different.
の大小の順序通りに配置された偏光部材。6. The polarizing member according to claim 5, wherein the superimposed members are arranged in the order of the helical pitch.
ピッチが小さい側に１／４波長板を有する偏光部材。7. The polarizing member according to claim 5, wherein a 波長 wavelength plate is provided on the side where the helical pitch of the superimposed body is small.
面内の主屈折率をｎx、ｎy、厚さ方向の主屈折率をｎz
としたとき、式：（ｎx−ｎz）／（ｎx−ｎy）で定義さ
れるＮｚが−０．５〜−２．５のものである偏光部材。8. The method according to claim 1, wherein the quarter-wave plate has an in-plane main refractive index of nx and ny and a main refractive index in the thickness direction of nz.
Where Nz defined by the formula: (nx-nz) / (nx-ny) is -0.5 to -2.5.
基準に二色性偏光板を有する側の表面に粘着層を介して
光学補償用の位相差板が接着されてなる偏光部材。9. The polarizing member according to claim 1, wherein a retardation plate for optical compensation is adhered to a surface having a dichroic polarizing plate with respect to a quarter wavelength plate via an adhesive layer. .
てなることを特徴とする面光源。10. A surface light source comprising the polarizing member according to claim 1. Description:
てなることを特徴とする液晶表示装置。11. A liquid crystal display device comprising the polarizing member according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000212173A JP2002022960A (en) | 2000-07-13 | 2000-07-13 | Polarizing member, surface light source and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000212173A JP2002022960A (en) | 2000-07-13 | 2000-07-13 | Polarizing member, surface light source and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002022960A true JP2002022960A (en) | 2002-01-23 |
Family
ID=18708125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000212173A Pending JP2002022960A (en) | 2000-07-13 | 2000-07-13 | Polarizing member, surface light source and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002022960A (en) |
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