JPH08271731A - Polarizing plate - Google Patents

Polarizing plate

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Publication number
JPH08271731A
JPH08271731A JP9630895A JP9630895A JPH08271731A JP H08271731 A JPH08271731 A JP H08271731A JP 9630895 A JP9630895 A JP 9630895A JP 9630895 A JP9630895 A JP 9630895A JP H08271731 A JPH08271731 A JP H08271731A
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plate
polarizing plate
wavelength
liquid crystal
retardation
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JP9630895A
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Japanese (ja)
Inventor
Kazutaka Hara
Hironori Motomura
Shusaku Nakano
Tatsuya Osuga
Takamori Shiyouda
Seiji Umemoto
Hiroyuki Yoshimi
秀作 中野
和孝 原
裕之 吉見
達也 大須賀
弘則 本村
清司 梅本
位守 正田
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Nitto Denko Corp
日東電工株式会社
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Abstract

PURPOSE: To develope a polarizing plate capable of forming highly polarized light over a wide wavelength region.
CONSTITUTION: The polarizing plate 4 is composed of a laminated body of a polarized light separating plate 1 having ≥2 cholesteric liquid crystal layers different from each other in the center wavelength of selective reflection and a I/4 wavelength plate 2 composed of a superimposed body of ≥2 phase different films different from each other in phase difference, contains a dichroic coloring matter in the 1/4 wavelength plate side and an elliptical-polarizing plate is formed by laminating the phase different plate. As a result, the polarizing plate 4 capable of forming highly linear-polarized light in wide wavelength region and the elliptically polarizing plate capable of forming highly elliptical- polarized light in the wide wavelength region are obtained.
COPYRIGHT: (C)1996,JPO

Description

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

【0001】 [0001]

【産業上の利用分野】本発明は、広い波長域にわたり高偏光度の光を形成しうるコレステリック液晶利用の偏光板に関する。 The present invention relates to a polarizing plate of the cholesteric liquid crystal use capable of forming a light of a high polarization degree over a wide wavelength range.

【0002】 [0002]

【従来の技術】従来、コレステリック液晶の選択反射、 Conventionally, a cholesteric liquid crystal of selective reflection,
すなわちある波長域で左右の一方の円偏光を反射し、残る円偏光を透過する性質(円偏光二色性)を利用した偏光板としては、2層以上のコレステリック液晶層の重畳体に、単層の1/4波長板を積層したものが知られていた(特開平1−133003号公報)。 That reflects one of the circularly polarized light of the left and right at a certain wavelength range, the polarizing plate using the property (circular dichroism) that transmits left circularly polarized light, the superposition of two or more layers of cholesteric liquid crystal layer, a single a laminate of a quarter-wave plate layer has been known (JP-a-1-133003). かかる偏光板によれば、二色性色素を含有する偏光板が示す吸収光の熱変換を防止でき、熱特性に優れるものとすることができる。 According to the polarizing plate, it can prevent thermal conversion of absorbed light indicated a polarizing plate containing a dichroic dye, can be excellent in thermal characteristics.

【0003】またコレステリック液晶層の重畳化により、式:λ=nP(ただし、λは波長、nは平均屈折率、Pはピッチである。)で表わされるそれぞれのコレステリック液晶層による選択反射の波長域を複合化できて、その波長域を広げることができ、可視光域等の広い波長範囲で選択反射することを可能にできる。 [0005] The superposition of the cholesteric liquid crystal layer, wherein: lambda = nP (although, lambda is the wavelength, n represents the average refractive index, P is a pitch.) Wavelength selective reflection by the respective cholesteric liquid crystal layers represented by and able to decrypt the band, can be spread the wavelength region, can allow the selective reflection in a wide wavelength range such as a visible light region.

【0004】しかしながら、可視域の光を入射させた場合、得られる光は直線偏光であるはずが、実際には殆どが楕円偏光で、目的の直線偏光を形成する能力に劣る問題点があった。 However, when light is incident in the visible region, should give light is linear polarized light, almost actually is an elliptical polarization, were capable inferior problem forming the linear polarization of the object .

【0005】 [0005]

【発明が解決しようとする課題】本発明は、広い波長域にわたり高偏光度の光を形成しうる偏光板の開発を課題とする。 [0008] The present invention aims to develop a polarizing plate capable of forming a light of a high polarization degree over a wide wavelength range.

【0006】 [0006]

【課題を解決するための手段】本発明は、選択反射の中心波長が異なる2層以上のコレステリック液晶層を有する偏光分離板と、位相差が異なる2枚以上の位相差フィルムの重畳体からなる1/4波長板との積層体からなることを特徴とする偏光板、その1/4波長板側に二色性色素を含有する偏光板、さらには位相差板を積層してなることを特徴とする楕円偏光板を提供するものである。 The present invention SUMMARY OF] consists of superposition of polarized separated plate and, at least two of the phase difference is different from a phase difference film having a cholesteric liquid crystal layer of two or more layers center wavelength different selective reflection wherein the polarizing plate, the polarizing plate containing a dichroic dye on the quarter-wave plate side, that further formed by laminating a retardation plate, comprising the laminate of the quarter-wave plate there is provided an elliptically polarizing plate according to.

【0007】 [0007]

【作用】本発明者らは、前記の課題を克服するために鋭意研究を重ねるなかで、従来の偏光板が偏光度に劣る原因が1/4波長板にあることを究明した。 SUMMARY OF inventors have found that among superimposing an extensive investigation with a view toward overcoming the above problems, and investigated that cause conventional polarizing plate is inferior in the degree of polarization is a quarter wave plate. すなわち、コレステリック液晶層の重畳化で広波長域にわたる選択反射を可能としても、その一部の波長の光にしか1/4波長板として機能せず、殆どの波長の光が楕円偏光に変換されることが原因であることを究明した。 That is, even permit selective reflection over a wide wavelength range by superposition of the cholesteric liquid crystal layer does not function as a quarter-wave plate only to light of a wavelength of a part, the light of the most wavelengths is converted into elliptically polarized light Rukoto was investigated to be the cause. ちなみに例えば、波長が550nmの光に対して1/4波長板として機能しても、波長が450nmや650nmの光に対しては1 Incidentally example, also function as a quarter-wave plate wavelength for light of 550 nm, for light having a wavelength of 450nm and 650 nm 1
/4波長板として機能しない。 / 4 does not function as a wavelength plate.

【0008】本発明の如く、1/4波長板を位相差が異なる2枚以上の位相差フィルムの重畳体で形成することにより、全可視光域等の広い波長域にわたる各波長光に対し1/4波長板としてほぼ機能しうるものとすることができ、これにより広い波長域にわたって高偏光度の光を形成することができる。 [0008] As the present invention, 1/4 retardation wave plate by form with piled body of two or more different retardation film for each wavelength over a wide wavelength range entire visible light range such as 1 / 4 can be made capable of substantially functions as a wave plate, thereby forming a light of a high polarization degree over a wide wavelength range.

【0009】 [0009]

【実施例】本発明の偏光板は、選択反射の中心波長が異なる2層以上のコレステリック液晶層を有する偏光分離板と、位相差が異なる2枚以上の位相差フィルムの重畳体からなる1/4波長板との積層体からなる。 EXAMPLES polarizing plate of the present invention consists of superposition of polarized separated plate and, the phase difference is more than two different retardation film having a cholesteric liquid crystal layer of two or more layers center wavelength different selective reflection 1 / 4 consists of a laminate of a wave plate. その例を図1に示した。 It was as shown in the Figure 1. 1が偏光分離板、2が1/4波長板であり、11,12,13が偏光分離板1を形成するコレステリック液晶層、21,22が1/4波長板2を形成する位相差フィルムである。 1 is polarized separated plate, 2 is a quarter-wave plate, a cholesteric liquid crystal layer 11, 12 and 13 form the polarized separated plate 1, 21 and 22 in the phase difference film to form a quarter-wave plate 2 is there. なお、3は接着層であり、4 Incidentally, 3 is an adhesive layer, 4
は積層体としての偏光板である。 Is a polarizing plate as a laminate.

【0010】偏光分離板としては、選択反射の中心波長が異なる2層以上のコレステリック液晶層を重畳したものが用いられる。 [0010] as a polarization separating plate is used which is superimposed a cholesteric liquid crystal layer of two or more layers center wavelength different selective reflection. 重畳数は、目的とする選択反射の波長域に応じて適宜に決定される。 Number superposition is suitably determined depending on the wavelength region of selective reflection of interest. ちなみに単層のコレステリック液晶層の選択反射域は、通例、数十〜百数十μm By the way, the selective reflection band of the cholesteric liquid crystal layer of a single layer, typically, several tens to one hundred and several tens μm
の範囲であることより、選択反射の中心波長が300〜 Than in the range of, 300 to the center wavelength of the selective reflection
900nmのものを選択反射の中心波長が異なる組合せ、 Combinations center wavelength of the selective reflection is different ones 900 nm,
就中それぞれ50nm以上異なる組合せで用いて、その2 Used in especially different each 50nm or more combinations, Part 2
〜6種類を重畳することで可視光域をカバーできる偏光分離板を得ることができる。 It can be obtained polarized separated plate which can cover the visible light region by superimposing the 6 types.

【0011】前記のコレステリック液晶層の重畳に際しては、同じ方向の円偏光を反射する組合せで用いることが好ましい。 [0011] In the superposition of the cholesteric liquid crystal layer, it is preferable to use a combination that reflects circularly polarized light in the same direction. これにより各層で反射される円偏光の位相状態を揃えて各波長域で異なる偏光状態となることを防止でき、光の利用効率を高めることができる。 Thus it is possible to prevent the the polarization state by aligning phase states different in each wavelength region of the circularly polarized light reflected by each layer, it is possible to enhance the utilization efficiency of light.

【0012】コレステリック液晶としては、適宜なものを用いてよく、特に限定はない。 [0012] As the cholesteric liquid crystal may be used as an appropriate and not particularly limited. 液晶層の重畳効率や薄膜化などの点より液晶ポリマーの使用が有利である。 Use of the liquid crystal polymer from the viewpoint of superimposed efficiency and thinning of the liquid crystal layer is advantageous. また複屈折の大きいコレステリック液晶分子ほど選択反射の波長域が広くなって好ましい。 The preferable wavelength range of the selective reflection larger cholesteric liquid crystal molecules of the birefringence wider.

【0013】前記の液晶ポリマーとしては、例えばポリエステル等の主鎖型液晶ポリマー、アクリル主鎖やメタクリル主鎖、シロキサン主鎖等からなる側鎖型液晶ポリマー、低分子カイラル剤含有のネマチック液晶ポリマー、キラル成分導入の液晶ポリマー、ネマチック系とコレステリック系の混合液晶ポリマーなどの適宜なものを用いうる。 [0013] As the liquid crystal polymers, for example, main chain type liquid crystal polymer such as polyester, acryl main chain or methacrylic backbone, siloxane main consisting of chains or the like side chain liquid crystalline polymers, low molecular chiral agent containing a nematic liquid crystal polymer, liquid crystal polymer chiral components introduced may use an appropriate one of a mixed liquid crystal polymer of a nematic series and cholesteric. 取扱性等の点よりは、ガラス転移温度が30 From the point of view of handling properties such as a glass transition temperature of 30
〜150℃のものが好ましい。 Those of ~150 ℃ is preferable.

【0014】コレステリック液晶層の形成は、偏光分離板に必要に応じポリイミドやポリビニルアルコール、S [0014] Formation of a cholesteric liquid crystal layer is needed on the polarization separating plate polyimide, polyvinyl alcohol, S
iOの斜方蒸着層等の適宜な配向膜を介して直接塗布する方式、透明フィルムなどからなる液晶ポリマーの配向温度で変質しない支持体に必要に応じ配向膜を介して塗布する方式などの適宜な方式で行うことができる。 It applied directly via an appropriate alignment layer obliquely evaporated layer or the like iO method appropriate, such as a method of coating with the alignment film as needed without alteration orientation temperature of the liquid crystal polymer consisting of a transparent film support it can be carried out in such a system. 支持体としては、偏光の状態変化を防止する点などより位相差が可及的に小さいものが好ましく用いうる。 As the support, those phase difference from such a point of preventing the change of state of polarization as small as possible can be preferably used. また配向膜を介したコレステリック液晶層の重畳方式なども採ることができる。 And it may also take such superimposing method of the cholesteric liquid crystal layer through alignment films.

【0015】なお液晶ポリマーの塗布は、溶剤による溶液や加熱による溶融液等の液状物としたものを、ロールコーティング方式やグラビア印刷方式、スピンコート方式などの適宜な方式で展開する方法などにより行うことができる。 [0015] Note that the liquid crystal polymer coating performs those with liquid material of the melt such as by solution or heating with a solvent, a roll coating method or a gravure printing method, by a method to deploy an appropriate method such as a spin coating method be able to. 形成するコレステリック液晶層の厚さは、選択反射性、配向乱れや透過率低下の防止等の点より、 The thickness of the cholesteric liquid crystal layer to be formed, selectively reflective, from the point of view of prevention of orientation disorder and decrease in transmittance,
0.5〜100μmが好ましい。 0.5~100μm is preferable.

【0016】位相差フィルムの重畳体からなる1/4波長板としては、例えば単色光に対して1/2波長の位相差を与えるものと、1/4波長の位相差を与えるものとの組合せで複数の位相差フィルムをそれらの光軸を交差させて積層したものがあげられる。 [0016] The combination of a 1/4 wavelength plate made of a superposition of the retardation film, and that provides a phase difference of 1/2 wavelength with respect to monochromatic light for example, as providing a phase difference of 1/4-wavelength in which a plurality of the retardation films are laminated by intersecting their optical axes thereof.

【0017】前記の場合、単色光に対して1/2波長又は1/4波長の位相差を与える位相差フィルムの複数枚をそれらの光軸を交差させて積層することにより、複屈折光の屈折率差(△n)と厚さ(d)の積(△nd)で定義されるリタデーションの波長分散を重畳ないし加減できて任意に制御でき、全体としての位相差を1/4波長に制御しつつ波長分散を抑制して、広い波長域にわたり1/4波長の位相差を示す波長板とすることができる。 [0017] When the, by laminating a plurality of retardation films giving a retardation of 1/2 wavelength or 1/4 wavelength with respect to monochromatic light by intersecting their optical axes, the birefringent light refractive index difference (△ n) and can be arbitrarily controlled can superimpose to moderate the wavelength dispersion of retardation defined by the product (△ nd) of thickness (d), controlling the phase difference as a whole to a quarter wavelength to suppress the wavelength dispersion while may be a wavelength plate showing a phase difference of a quarter wavelength over a wide wavelength range.

【0018】前記において位相差フィルムの積層数は任意である。 The lamination number of the retardation film in the is arbitrary. 光の透過率などの点より2〜5枚の積層が一般的である。 2-5 sheets of the stack from the viewpoint of the transmittance of light is generally used. また、1/2波長の位相差を与える位相差フィルムと1/4波長の位相差を与える位相差フィルムの配置位置も任意である。 The arrangement position of the retardation film giving the retardation of the retardation film and the 1/4 wavelength giving a phase difference of 1/2-wavelength is also arbitrary.

【0019】また位相差フィルムの重畳体からなる1/ Further consisting superposition of the retardation film 1 /
4波長板は、波長450nmの光におけるリタデーションをR 450 、波長550nmの光におけるリタデーションをR 550とした場合に、R 450 /R 550が1.00〜1.05 4 wave plate, a retardation in the light of a wavelength of 450 nm R 450, a retardation in the light of a wavelength of 550nm when the R 550, R 450 / R 550 is 1.00 to 1.05
でリタデーションが大きい位相差フィルムと、前記の比が1.05〜1.20でリタデーションが小さい位相差フィルムとを、それらの光軸を交差させて積層したものなどとしても得ることができる。 And the retardation film retardation is large in, and the ratio of phase difference retardation is small 1.05 to 1.20 film can be obtained as such as those laminated by intersecting their optical axes.

【0020】前記の場合もリタデーションが異なる位相差フィルムを光軸を交差させて、就中、直交させて積層することにより、各位相差フィルムにおけるリタデーションの波長分散を重畳ないし加減できて制御でき、特にリタデーションを短波長側ほど小さくすることができる。 [0020] Also crossed optical axes a retardation film retardation if different said, inter alia, by laminating by orthogonally, can be controlled can superimpose to moderate the wavelength dispersion of the retardation at each phase difference film, in particular it is possible to reduce the retardation shorter wavelength side.

【0021】ちなみに前記による1/4波長板の具体例としては、ポリビニルアルコールフィルムを延伸処理してなる位相差フィルム(波長550nmの光におけるリタデーション:700nm)と、ポリカーボネートフィルムを延伸処理してなる位相差フィルム(波長550nmの光におけるリタデーション:560nm)を、それらの光軸が直交するように積層したものなどがあげられる。 [0021] Incidentally Specific examples of the quarter-wave plate by the a phase difference film obtained by stretching a polyvinyl alcohol film (retardation at wavelength 550nm light: 700 nm) and, position obtained by stretching a polycarbonate film retardation film (retardation at wavelength 550nm light: 560 nm), and the like formed by laminating such that their optical axes are orthogonal and the like. かかる積層物は、波長450〜650nmにわたってほぼ1/ Such laminates are substantially over a wavelength 450 to 650 nm 1 /
4波長板として機能する。 4 to function as a wavelength plate.

【0022】位相差フィルムは、上記の如く例えば高分子フィルムを一軸、ないし二軸等で延伸処理する方法などにより得ることができる。 The retardation film, the above as example a polymer film uniaxially, or can be obtained by a method of stretching in biaxial or the like. その高分子の種類については特に限定はなく、透明性に優れるものが好ましく用いられる。 Its no particular limitation on the kind of polymer, is preferably used which is excellent in transparency. その例としては、ポリカーボネート系高分子、 Examples thereof include polycarbonate-based polymer,
ポリエステル系高分子、ポリスルホン系高分子、ポリエーテルスルホン系高分子、ポリスチレン系高分子、ポリオレフィン系高分子、ポリビニルアルコール系高分子、 Polyester based polymers, polysulfone-based polymers, polyethersulfone-based polymers, polystyrene polymers, polyolefin polymers, polyvinyl alcohol polymers,
酢酸セルロース系高分子、ポリ塩化ビニル系高分子、ポリメチルメタクリレート系高分子などがあげられる。 Cellulose polymers acetate, polyvinyl chloride polymers, such as polymethyl methacrylate-based polymer.

【0023】特に、R 450 /R 550が1.00〜1.05の位相差フィルムは、例えばポリオレフィン系高分子、ポリビニルアルコール系高分子、酢酸セルロース系高分子、ポリ塩化ビニル系高分子、ポリメチルメタクリレート系高分子の如く、吸収端が200nmの波長付近にある高分子などを用いて形成することができる。 [0023] In particular, the retardation film of the R 450 / R 550 is 1.00 to 1.05, for example polyolefin-based polymers, polyvinyl alcohol polymers, cellulose polymers acetate, polyvinyl chloride polymers, poly as methyl methacrylate-based polymers, absorption edge can be formed by using a polymer which is in the vicinity of a wavelength of 200 nm.

【0024】またR 450 /R 550が1.05〜1.20の位相差フィルムは、例えばポリカーボネート系高分子、ポリエステル系高分子、ポリスルホン系高分子、ポリエーテルスルホン系高分子、ポリスチレン系高分子の如く、 [0024] The retardation film of the R 450 / R 550 is 1.05 to 1.20, for example polycarbonate-based polymer, polyester-based polymers, polysulfone-based polymers, polyethersulfone-based polymers, polystyrene-based polymer as of,
吸収端が200nmよりも長波長側にある高分子などを用いて形成することができる。 Absorption edge can be formed by using a polymer than 200nm in the long wavelength side.

【0025】本発明の偏光板においては、その1/4波長板側に、二色性色素を含有する偏光板を積層することで、それに吸収成分の少ない光が供給され、かつ吸収成分は吸収されることから、より偏光度の高い偏光板とすることができる。 [0025] In the polarizing plate of the present invention, the 1/4 wavelength plate side, by laminating the polarizing plate containing a dichroic dye, less light absorption component is supplied thereto, and the absorbing component absorbs from being it may be a higher degree of polarization polarizing plate. かかる偏光板の例を図2に示した。 Examples of such polarizing plates shown in Figure 2. 5
が二色性色素を含有する偏光板である。 There is a polarizing plate containing a dichroic dye.

【0026】二色性色素を含有する偏光板としては、適宜なものを用いることができ、特に限定はない。 [0026] As polarizing plate containing a dichroic dye can be used suitable one is not particularly limited. 一般には、ポリビニルアルコールの如き親水性高分子からなるフィルムを、ヨウ素や二色性染料の如き二色性色素で処理して延伸したものや、それを封止フィルムで保護したものなどが用いられる。 In general, a film made of such a hydrophilic polymer polyvinyl alcohol, which was stretched by treatment with, such as iodine or a dichroic dye dichroic dye or the like which those protected by a sealing film used .

【0027】また本発明においては、前記の二色性色素を含有する偏光板の上に位相差板を設けることで、高性能な楕円偏光板を得ることができる。 [0027] In the present invention, by providing the phase difference plate on the polarizing plate containing the dichroic dye, it is possible to obtain a high performance elliptically polarizing plate. その例を図3に示した。 It was as shown in the FIG. 6が位相差板である。 6 is a phase difference plate. 位相差板としては、上記で例示の位相差フィルムなどの適宜なものを用いうる。 As a retardation plate, it may be used a suitable one, such as a phase difference film exemplified above. かかる位相差板は、単層であってもよいし、2層以上の位相差層で形成されていてもよい。 Such retardation plate may be a single layer, or may be formed by two or more layers of the retardation layer.

【0028】なお、偏光分離板や1/4波長板の作製など本発明の(楕円)偏光板の形成に際しては、例えば透明な接着剤ないし粘着剤を用いることができる。 [0028] Note that when the polarization separating plate or of making such invention quarter-wave plate (elliptically) polarizing plate formation can be used, for example a transparent adhesive or pressure-sensitive adhesive. その接着剤等の種類については特に限定はない。 There is no particular limitation on the kind of such the adhesive. 構成部材の光学特性の変化防止の点より、硬化や乾燥の際に高温のプロセスを要しないものが好ましく、長時間の硬化処理や乾燥時間を要しないものが望ましい。 From the point of change prevention of optical properties of the components, preferably those which do not require high temperature process upon curing and drying, it is desirable which does not require a long curing and drying times.

【0029】偏光板や楕円偏光板は、直線偏光又は楕円偏光を供給する光学素子として例えば液晶表示装置の形成などの種々の目的に用いうる。 The polarizing plate and elliptically polarizing plate, may be used for various purposes such as formation of an optical element which supplies linearly polarized light or elliptically polarized light, for example, a liquid crystal display device. その場合、必要に応じ粘着層等を付設するなどして被着体に接着できる形態とすることもできる。 In that case, it may be a form capable bonded, such as by attaching a necessary depending adhesive layer or the like to an adherend.

【0030】本発明の(楕円)偏光板の有利な使用方法は、偏光分離板による反射光を再利用して光の利用効率を向上させる方法である。 The advantageous use of the (elliptical) polarization plate present invention is to reuse the reflected light by the polarized separated plate is a method for improving the utilization efficiency of light. すなわち、偏光分離板は特定の円偏光を反射することから、その反射光を装置底面などに配置した反射層等を介してそれらの間に閉じ込め、 That is, the polarized separated plate from reflecting the specific circularly polarized light, trapped between them through the reflective layer etc. prepared to place the reflected light such as the bottom surface of the device,
当該反射光に金属面反射等に基づく偏光の反転手段や、 Inverting means and the polarization-based metal surface reflection or the like on the reflected light,
拡散板や位相差板等による位相変化に基づく偏光解消手段などを施して、当該反射光の全部又は一部が偏光分離板を透過しうる状態とし、これにより偏光分離板による反射ロスを防止して光の利用効率を高める方法である。 Subjected to such depolarizing means based on the phase change due to the diffusion plate or a retardation plate or the like, a state where all or part of the reflected light may be transmitted through the polarization separating plate, thereby preventing reflection loss caused by the polarization separating plate Te is a method of enhancing the utilization efficiency of light.

【0031】参考例1 メタクリル主鎖の側鎖型ネマチック液晶ポリマーのテトラクロロエタン溶液をトリアセチルセルロースフィルムのポリイミド配向膜上にスピンナーにて塗工し、150 [0031] coating a tetrachloroethane solution of a side chain-type nematic liquid crystal polymer of Reference Example 1 methacrylic backbone at a spinner on the polyimide alignment layer triacetyl cellulose film, 150
℃で10分間乾燥硬化して厚さ5μmのコレステリック液晶層を形成する方式で、選択反射の中心波長が450 At ℃ 10 minutes dry cured method of forming a cholesteric liquid crystal layer having a thickness of 5μm, the center wavelength of the selective reflection 450
nm、550nm、650nmの3種類のコレステリック液晶層付設フィルムを得た。 nm, 550 nm, three kinds of cholesteric liquid crystal layer attached film 650nm was obtained. 次にその3種類のフィルムをアクリル系粘着層を介して積層し、偏光分離板を得た。 Then the three films were laminated via an acrylic adhesive layer, to obtain a polarization separating plate. なお前記コレステリック液晶層における選択反射の中心波長の制御は、側鎖型ネマチック液晶ポリマーに配合するカイラル剤(チッソ社製、CM−32)の添加量を制御することにより行った。 Note the control of the central wavelength of the selective reflection in the cholesteric liquid crystal layer was carried out by controlling the addition amount of the chiral agent to be blended in the side chain-type nematic liquid crystal polymer (made by Chisso Corporation, CM-32).

【0032】参考例2 厚さ50μmのポリカーボネートフィルムを150℃で2.5%延伸処理し、複屈折光に基づいて波長550nm [0032] Reference Example 2 A polycarbonate film having a thickness of 50μm was 2.5% stretched at 0.99 ° C., wavelength 550nm based on birefringent light
の光に対して1/4波長の位相差を与える1/4位相差フィルムを得た。 To obtain a quarter retardation film giving the retardation of 1/4 wavelength with respect to light. また厚さ50μmのポリカーボネートフィルムを150℃で5%延伸処理し、複屈折光に基づいて波長550nmの光に対して1/2波長の位相差を与える1/2位相差フィルムを得た。 The polycarbonate film having a thickness of 50μm to 5% stretched at 0.99 ° C., to obtain a 1/2 retardation film giving the retardation of 1/2 wavelength with respect to light with a wavelength of 550nm on the basis of the birefringent light. 次に前記の1/4位相差フィルムと1/2位相差フィルムをそれらの遅相軸が60度の角度で交差するようにアクリル系粘着層を介して積層し、1/4波長板を得た。 Then laminating the 1/4 phase retardation film and the 1/2 phase difference film of the via an acrylic adhesive layer such that their slow axes intersect at an angle of 60 degrees, to obtain a 1/4-wave plate It was.

【0033】実施例1 参考例1で得た偏光分離板に参考例2で得た1/4波長板をその1/4位相差フィルム側を介してアクリル系粘着層を介して積層し、偏光板を得た。 [0033] Example 1 a quarter-wave plate obtained in Reference Example 2 in polarized separated plate obtained in Reference Example 1 through the 1/4 phase difference film side were laminated via an acrylic adhesive layer, polarizing to obtain a plate.

【0034】比較例 1/4波長板として、ジアセチルセルロースフィルムからなる単層物を用いたほかは実施例1に準じて偏光板を得た。 [0034] As a comparative example a quarter-wave plate, in addition to using a single layer composed of diacetyl cellulose film to obtain a polarizing plate according to Example 1.

【0035】評価試験 実施例1又は比較例で得た偏光板の2枚を重ねて、偏光軸が平行のときの透過率(H 0 )と直交のときの透過率(H 90 )を分光光度計(島津製作所社製、MPS−20 [0035] Evaluation Test Example 1 or overlapping two polarizing plates obtained in Comparative Example, the spectral transmittance when the polarization axes are parallel (H 0) and perpendicular transmittance when the (H 90) intensity total (manufactured by Shimadzu Corporation, MPS-20
00)にて測定し、次式に基づいて偏光度(P)を測定した。 Measured at 00), it was measured degree of polarization (P) based on the following equation. P={(H 0 −H 90 )/(H 0 +H 90 )} 1/2 P = {(H 0 -H 90 ) / (H 0 + H 90)} 1/2

【0036】前記の結果を、450nm、550nm、65 [0036] The above results, 450nm, 550nm, 65
0nmの各波長光について下表に示した。 It is shown in the table below for each wavelength of 0 nm.

【0037】 [0037]

【発明の効果】本発明によれば、広い波長域にわたり高度に直線偏光した光を形成できる偏光板を得ることができ、また偏光板と位相差板を付加して広い波長域にわたり高度に楕円偏光した光を形成できる楕円偏光板を得ることができる。 According to the present invention, highly can be obtained a polarizing plate capable of forming a linearly polarized light over a wide wavelength range, also highly over a wide wavelength range by adding a polarizing plate with a retardation plate oval it is possible to obtain an elliptically polarizing plate capable of forming a polarized light.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】偏光板を例示した断面図 [1] illustrated sectional view of the polarizer

【図2】他の偏光板を例示した断面図 [Figure 2] illustrates the other polarizing plate cross-sectional view

【図3】楕円偏光板を例示した断面図 Figure 3 is a cross-sectional view illustrating an elliptical polarizing plate

【符号の説明】 DESCRIPTION OF SYMBOLS

1:偏光分離板(11,12,13:コレステリック液晶層) 2:1/4波長板(21,22:位相差フィルム) 5:二色性色素を含有する偏光板 6:位相差板 1: polarization separating plate (11, 12, 13: cholesteric liquid crystal layer) 2: quarter-wave plate (21, 22: phase difference film) 5: polarizing plate 6 containing a dichroic dye: retarder

───────────────────────────────────────────────────── フロントページの続き (72)発明者 原 和孝 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 本村 弘則 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 (72)発明者 吉見 裕之 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 ────────────────────────────────────────────────── ─── of the front page continued (72) inventor Kazutaka Hara Ibaraki, Osaka Shimohozumi 1-chome No. 1 No. 2 Nitto Denko Co., Ltd. in the (72) inventor Motomura Hironori Ibaraki, Osaka Shimohozumi 1-chome No. 1 No. 2 the Nitto Electric Works Co., Ltd. (72) inventor Shoda newt Ibaraki, Osaka Shimohozumi 1-chome No. 1 No. 2 Nitto Denko Co., Ltd. in the (72) inventor Hiroyuki Yoshimi Ibaraki, Osaka Shimohozumi 1-chome No. 1 No. 2 Nitto the Electric Works Co., Ltd.

Claims (3)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 選択反射の中心波長が異なる2層以上のコレステリック液晶層を有する偏光分離板と、位相差が異なる2枚以上の位相差フィルムの重畳体からなる1/ 1. A consists superposition of polarized separated plate and, at least two of the phase difference is different from a phase difference film having a cholesteric liquid crystal layer of the center wavelength of the selective reflection is different two or more layers 1 /
    4波長板との積層体からなることを特徴とする偏光板。 4 A polarizing plate characterized by comprising a laminate of the wave plate.
  2. 【請求項2】 請求項1に記載の偏光板における1/4 2. A quarter of the polarizing plate according to claim 1
    波長板側に、二色性色素を含有する偏光板を積層してなることを特徴とする偏光板。 Wave plate side, a polarizing plate, characterized in that formed by laminating a polarizing plate containing a dichroic dye.
  3. 【請求項3】 請求項1に記載の偏光板における1/4 3. A 1/4 in polarizing plate according to claim 1
    波長板側に、二色性色素を含有する偏光板と位相差板を積層してなることを特徴とする楕円偏光板。 Wave plate side, elliptically polarizing plate, characterized in that formed by laminating a polarizing plate with a retardation plate containing a dichroic dye.
JP9630895A 1995-03-28 1995-03-28 Polarizing plate Pending JPH08271731A (en)

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US5995180A (en) * 1997-07-07 1999-11-30 Sharp Kabushiki Kaisha Liquid crystal display device having high brightness and high contrast
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US6573963B2 (en) 2001-02-22 2003-06-03 3M Innovativeproperties Company Cholesteric liquid crystal optical bodies and methods of manufacture
US6859241B2 (en) 2001-10-16 2005-02-22 Nitto Denko Corporation Method of producing polarizing plate, and liquid crystal display comprising the polarizing plate
US6876427B2 (en) 2001-09-21 2005-04-05 3M Innovative Properties Company Cholesteric liquid crystal optical bodies and methods of manufacture and use
US6891585B2 (en) 2001-04-04 2005-05-10 Dai Nippon Printing Co., Ltd. Circularly-polarized-light-extracting optical element having chlosteric layer with changing chiral pitch
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US7507426B2 (en) 2003-02-06 2009-03-24 Lg Chem, Ltd. Unified polarizing plate and method for preparing the same
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US5995180A (en) * 1997-07-07 1999-11-30 Sharp Kabushiki Kaisha Liquid crystal display device having high brightness and high contrast
US7106397B1 (en) 1999-08-04 2006-09-12 Nitto Denko Corporation Liquid crystal display device having a polarization member that includes a cholesteric liquid crystal layer and solid optical rotatory film
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US6862073B2 (en) 2000-12-20 2005-03-01 Dai Nippon Printing Co., Ltd. Circularly-polarized-light extracting optical element and process of producing the same
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US6977099B2 (en) 2000-12-27 2005-12-20 Dai Nippon Printing Co., Ltd. Liquid crystalline transfer sheet and process of producing the same
US6573963B2 (en) 2001-02-22 2003-06-03 3M Innovativeproperties Company Cholesteric liquid crystal optical bodies and methods of manufacture
US6917399B2 (en) 2001-02-22 2005-07-12 3M Innovative Properties Company Optical bodies containing cholesteric liquid crystal material and methods of manufacture
US7277141B2 (en) 2001-02-22 2007-10-02 3M Innovative Properties Company Optical bodies containing cholesteric liquid crystal material and methods of manufacture
US6891585B2 (en) 2001-04-04 2005-05-10 Dai Nippon Printing Co., Ltd. Circularly-polarized-light-extracting optical element having chlosteric layer with changing chiral pitch
US6876427B2 (en) 2001-09-21 2005-04-05 3M Innovative Properties Company Cholesteric liquid crystal optical bodies and methods of manufacture and use
US7298442B2 (en) 2001-09-21 2007-11-20 3M Innovative Properties Company Cholesteric liquid crystal optical bodies and methods of manufacture and use
US6954240B2 (en) 2001-10-16 2005-10-11 Nitto Denko Corporation Method of producing polarizing plate, and liquid crystal display comprising the polarizing plate
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US7989570B2 (en) 2002-07-10 2011-08-02 Lg Chem, Ltd. Catalyst system for preparing cyclic olefin addition polymer, cyclic olefin addition polymer prepared by using the catalyst system and method for preparing the same
US7507426B2 (en) 2003-02-06 2009-03-24 Lg Chem, Ltd. Unified polarizing plate and method for preparing the same
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KR100769446B1 (en) * 2005-06-09 2007-10-22 주식회사 엘지화학 Vertically aligned liquid crystal display
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