JP2017026879A - Circular polarization element for organic el display and organic el display - Google Patents
Circular polarization element for organic el display and organic el display Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
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- Electroluminescent Light Sources (AREA)
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Abstract
Description
本発明は、有機ＥＬ表示装置用円偏光素子、及び有機ＥＬ表示装置に関する。 The present invention relates to a circularly polarizing element for an organic EL display device and an organic EL display device.
有機ＥＬ表示装置（「ＯＬＥＤディスプレイ」ともいう。）は、自発光型の薄型表示装置であり、液晶表示装置と比較して視認性が高く、視野角依存性が少ないという特性を有する。また、有機ＥＬ表示装置は、軽量化及び薄型化が容易であると共に、フレキシブルな基板等を用いることにより、フレキシブルな有機ＥＬ表示装置を作製することもできる。 An organic EL display device (also referred to as an “OLED display”) is a self-luminous thin display device, and has characteristics of high visibility and less viewing angle dependency than a liquid crystal display device. In addition, the organic EL display device can be easily reduced in weight and thickness, and a flexible organic EL display device can be manufactured by using a flexible substrate or the like.
他方、有機ＥＬ表示装置は、電極にＩＴＯなどの高屈折率の透明導電性材料を用いて屈折率の異なる層を積層したり、反射率の高い金属材料などを用いたりしているため、外光がそれらの界面で反射し、コントラストの低下や内部反射による映り込みなどの問題が生じることがある。特に、屋外等の外光の強い環境下で有機ＥＬ表示装置を使用すると、画面に外光が反射し易いため、画面の視認性が著しく低下する。 On the other hand, the organic EL display device uses a transparent conductive material having a high refractive index, such as ITO, as the electrode, and layers having different refractive indexes or a metal material having a high reflectance is used. Light may be reflected at their interface, causing problems such as reduced contrast and reflection due to internal reflection. In particular, when the organic EL display device is used in an environment with strong external light such as outdoors, the external light is easily reflected on the screen, so that the visibility of the screen is remarkably lowered.
外光の反射による有機ＥＬ表示装置の視認性の低下を防止するために、従来、直線偏光板とλ／４位相差板とを備える円偏光素子を有機ＥＬ表示装置に設けることが提案されている（例えば、特許文献１）。 In order to prevent the deterioration of the visibility of the organic EL display device due to reflection of external light, it has been proposed to provide a circularly polarizing element having a linearly polarizing plate and a λ / 4 retardation plate in the organic EL display device. (For example, Patent Document 1).
上記の従来の円偏光素子は、直線偏光板として、ヨウ素などの二色性物質でポリビニルアルコール（ＰＶＡ）を染色して一軸延伸し、二色性物質を延伸配向させることによって製造されたヨウ素系延伸偏光フィルムを用いている。
しかしながら、ヨウ素系延伸偏光フィルムは透過率が４５％未満であるため、光取り出し効率（すなわち、有機ＥＬ素子から発生した光が表示画面に到達する効率）が低い。実際、ヨウ素系延伸偏光フィルムの透過率を高くしようとすると、ヨウ素の染色（含有）量を低減する必要があるが、この場合、二色性物質でＰＶＡを均一に染色することができないことがあるため、直線偏光板としての機能が十分に確保されない。また、外光の反射を低減する効果にバラつきが生じ、信頼性が低下することがある。さらに、ヨウ素系延伸偏光フィルムは耐熱性が低いため、有機ＥＬ表示装置の用途も制限される。
The above conventional circularly polarizing element is a linear polarizing plate manufactured by dyeing polyvinyl alcohol (PVA) with a dichroic material such as iodine, uniaxially stretching, and stretching and aligning the dichroic material. A stretched polarizing film is used.
However, since the iodine-type stretched polarizing film has a transmittance of less than 45%, the light extraction efficiency (that is, the efficiency with which light generated from the organic EL element reaches the display screen) is low. In fact, when trying to increase the transmittance of the iodine-based stretched polarizing film, it is necessary to reduce the dyeing (containment) amount of iodine, but in this case, PVA cannot be uniformly dyed with a dichroic substance. Therefore, the function as a linear polarizing plate is not sufficiently ensured. In addition, the effect of reducing the reflection of external light may vary and reliability may be reduced. Furthermore, since the iodine-type stretched polarizing film has low heat resistance, the use of the organic EL display device is also limited.
本発明は、上記のような問題を解決するためになされたものであり、外光の強い環境下であっても優れた反射防止機能を有し、しかも耐熱性及び光取り出し効率が高い有機ＥＬ表示装置用円偏光素子を提供することを目的とする。
また、本発明は、耐熱性及び視認性を向上させた有機ＥＬ表示装置を提供することを目的とする。
The present invention has been made to solve the above problems, and has an excellent antireflection function even in an environment with strong external light, and has high heat resistance and high light extraction efficiency. An object is to provide a circularly polarizing element for a display device.
Another object of the present invention is to provide an organic EL display device with improved heat resistance and visibility.
本発明は、二色性色素及び液晶性高分子を含む直線偏光板と、λ／４位相差板とを備えることを特徴とする有機ＥＬ表示装置用円偏光素子である。
また、本発明は、上記の有機ＥＬ表示装置用円偏光素子を備えることを特徴とする有機ＥＬ表示装置である。
The present invention is a circularly polarizing element for an organic EL display device comprising a linearly polarizing plate containing a dichroic dye and a liquid crystalline polymer, and a λ / 4 retardation plate.
Moreover, this invention is provided with said circularly-polarizing element for organic EL display apparatuses, It is an organic EL display apparatus characterized by the above-mentioned.
本発明によれば、外光の強い環境下であっても優れた反射防止機能を有し、しかも耐熱性及び光取り出し効率が高い有機ＥＬ表示装置用円偏光素子を提供することができる。
また、本発明によれば、耐熱性及び視認性を向上させた有機ＥＬ表示装置を提供することができる。
According to the present invention, it is possible to provide a circularly polarizing element for an organic EL display device which has an excellent antireflection function even under an environment with strong external light, and which has high heat resistance and high light extraction efficiency.
Moreover, according to the present invention, an organic EL display device with improved heat resistance and visibility can be provided.
本発明の有機ＥＬ表示装置用円偏光素子（以下、「円偏光素子」と略す。）は、直線偏光板とλ／４位相差板とを備える。
直線偏光板は、二色性色素及び液晶性高分子を含む。ここで、本明細書において「二色性色素」とは、細長い分子形状を有しており、入射光に対して分子の長軸と短軸とで異なる吸光度を呈する色素のことを意味する。具体的には、二色性色素は、分子の長軸方向に振動する光を吸収し、これと直交する方向の光を透過する性質を有する。
二色性色素としては、特に限定されず、当該技術分野において公知のものを用いることができる。二色性色素の例としては、ヨウ素の他、ジスアゾ化合物、トリスアゾ化合物、テトラキスアゾ化合物等のアゾ系化合物が挙げられる。これらは、単独又は２種以上を組み合わせて用いることができる。
The circularly polarizing element for organic EL display devices of the present invention (hereinafter abbreviated as “circularly polarizing element”) includes a linearly polarizing plate and a λ / 4 retardation plate.
The linear polarizing plate contains a dichroic dye and a liquid crystalline polymer. Here, the “dichroic dye” in the present specification means a dye having an elongated molecular shape and exhibiting different absorbances between the major axis and the minor axis of the molecule with respect to incident light. Specifically, the dichroic dye absorbs light that vibrates in the long axis direction of the molecule and transmits light in a direction orthogonal to the light.
The dichroic dye is not particularly limited, and those known in the technical field can be used. Examples of dichroic dyes include azo compounds such as disazo compounds, trisazo compounds, and tetrakisazo compounds in addition to iodine. These can be used alone or in combination of two or more.
本明細書において「液晶性高分子」とは、液晶状態が室温において固定化された高分子のことを意味する。具体的には、液晶性高分子は、分子構造中に重合性基を有する液晶性モノマーを架橋させて、架橋前の光学的異方性を保持したまま硬化させた高分子、又はガラス転移温度を有し、このガラス転移温度以上に加熱すると液晶相を示し、その後、ガラス転移温度以下に冷却することにより、液晶組織を保持することができる高分子などである。
液晶性高分子としては、特に限定されず、当該技術分野において公知のものを用いることができる。具体的には、液晶性を発現するような剛直なメソゲン基を主鎖及び／又は側鎖に導入したものを用いることができる。液晶高分子の例としては、エチレンテレフタレートとパラヒドロキシ安息香酸との重縮合体、フェノール及びフタル酸とパラヒドロキシ安息香酸との重縮合体等の液晶ポリエステルが挙げられる。これらは、単独又は２種以上を組み合わせて用いることができる。
In the present specification, the “liquid crystalline polymer” means a polymer in which a liquid crystal state is fixed at room temperature. Specifically, the liquid crystalline polymer is a polymer obtained by crosslinking a liquid crystalline monomer having a polymerizable group in the molecular structure and curing the optical anisotropy before crosslinking, or a glass transition temperature. And a polymer capable of exhibiting a liquid crystal phase when heated to a temperature equal to or higher than the glass transition temperature and then maintaining a liquid crystal structure by cooling to a temperature lower than the glass transition temperature.
The liquid crystalline polymer is not particularly limited, and those known in the technical field can be used. Specifically, those obtained by introducing a rigid mesogenic group exhibiting liquid crystallinity into the main chain and / or the side chain can be used. Examples of the liquid crystal polymer include liquid crystal polyesters such as a polycondensate of ethylene terephthalate and parahydroxybenzoic acid and a polycondensate of phenol and phthalic acid and parahydroxybenzoic acid. These can be used alone or in combination of two or more.
直線偏光板において、二色性色素は、液晶性高分子の一軸配向に合わせて分子の長軸が整列しており、入射光に含まれる振動成分を選択的に吸収して直線偏向に変換する。
直線偏光板は、本発明の円偏光素子が設けられる基板にポリイミド等の配向膜を形成した後、所定の方向に沿ってラビングして配向処理し、液晶性高分子又は液晶性モノマーと二色性色素とを含む組成物を配向膜上に塗布して塗膜を形成し、この塗膜を硬化処理（例えば、熱硬化、紫外線硬化）することによって形成することができる。また、基板として離型性基板を用いれば、自立性の直線偏光板を製造することができる。なお、上記のラビング法の代わりに、光配向法の他、電場や磁場等の外場を利用する公知の配向法を用いてもよい。このような方法によって製造される直線偏光板は、従来のヨウ素系延伸偏光フィルムに比べて、薄型化が可能であると共に、二色性色素を均一に分散配向させることが容易にできる。
In the linear polarizing plate, the dichroic dye is aligned with the uniaxial orientation of the liquid crystalline polymer, and the long axis of the molecule is aligned, and selectively absorbs the vibration component contained in the incident light and converts it into linear deflection. .
The linearly polarizing plate is formed by forming an alignment film such as polyimide on a substrate on which the circularly polarizing element of the present invention is provided, and then rubbing it along a predetermined direction to perform alignment treatment, so that the liquid crystal polymer or liquid crystal monomer and two colors It can be formed by applying a composition containing a functional dye on an alignment film to form a coating film, and curing the coating film (for example, heat curing or ultraviolet curing). Further, if a release substrate is used as the substrate, a self-supporting linearly polarizing plate can be manufactured. In addition to the rubbing method, a known alignment method using an external field such as an electric field or a magnetic field may be used in addition to the photo-alignment method. The linearly polarizing plate manufactured by such a method can be made thinner than the conventional iodine-based stretched polarizing film, and can easily disperse and orient the dichroic dye uniformly.
液晶性モノマーを組成物に用いる場合、組成物は、液晶性モノマーをポリマー化するための成分（例えば、光硬化させる場合は、光重合開始剤、カイラル剤など）を含むことができる。また、組成物の粘性を調整するために、メチルエチルケトンやシクロヘキサノン等の溶媒を組成物に配合してもよい。 When using a liquid crystalline monomer for a composition, the composition can contain the component for polymerizing a liquid crystalline monomer (For example, when making it photocure, a photoinitiator, a chiral agent, etc.). In order to adjust the viscosity of the composition, a solvent such as methyl ethyl ketone or cyclohexanone may be added to the composition.
組成物を配向膜上に塗布する方法としては、均一に塗布することが可能な方法であれば特に限定されない。塗布方法の例としては、スピンコーティング、ダイコーティング、スリットコーティング等が挙げられる。 The method for applying the composition on the alignment film is not particularly limited as long as it can be applied uniformly. Examples of the application method include spin coating, die coating, and slit coating.
硬化処理前の液晶性高分子又は液晶性モノマーはランダムな状態にあるのに対し、硬化処理後は、液晶性高分子が配向方向に沿って整列し、一軸配向性が得られる。そして、液晶高分子の一軸配向性に合わせて、二色性色素が一軸配向状態となる。 The liquid crystalline polymer or liquid crystalline monomer before the curing treatment is in a random state, whereas after the curing treatment, the liquid crystalline polymer is aligned along the orientation direction, and uniaxial orientation is obtained. And according to the uniaxial orientation of a liquid crystal polymer, a dichroic dye will be in a uniaxial orientation state.
本発明に用いられる直線偏光板の厚さは、特に限定されないが、好ましくは０．５μｍ以上１０μｍ未満、より好ましくは１μｍ〜９μｍ、さらに好ましくは２μｍ〜８μｍである。 The thickness of the linearly polarizing plate used in the present invention is not particularly limited, but is preferably 0.5 μm or more and less than 10 μm, more preferably 1 μm to 9 μm, and further preferably 2 μm to 8 μm.
λ／４位相差板は、入射光の偏光面にλ／４の位相差を与えるものであり、直線偏向を円偏光に変えることができる。λ／４位相差板としては、特に限定されず、当該技術分野において公知のものを用いることができる。また、λ／４位相差板は、λ／４の位相差が得られれば、複数の複屈折板によって構成されていてもよい。
λ／４位相差板を構成する材料としては、特に限定されないが、耐熱性を有するポリイミド系樹脂などが好ましい。
The λ / 4 retardation plate gives a phase difference of λ / 4 to the polarization plane of incident light, and linear deflection can be changed to circularly polarized light. The λ / 4 retardation plate is not particularly limited, and those known in the technical field can be used. The λ / 4 retardation plate may be composed of a plurality of birefringent plates as long as a λ / 4 phase difference is obtained.
The material constituting the λ / 4 retardation plate is not particularly limited, but a heat resistant polyimide resin or the like is preferable.
λ／４位相差板は、逆波長分散性を有することが好ましい。このような性質を有するλ／４位相差板を用いることにより、反射防止機能を向上させることができる。ここで、本明細書において「逆波長分散性」とは、複屈折が波長に比例する関係を有する性質のことを意味する。 The λ / 4 retardation plate preferably has reverse wavelength dispersion. By using the λ / 4 retardation plate having such properties, the antireflection function can be improved. Here, “reverse wavelength dispersion” in this specification means a property having a relationship in which birefringence is proportional to the wavelength.
直線偏光板とλ／４位相差板とは、接着剤を介して固定積層されていることが好ましい。接着剤としては、特に限定されず、当該技術分野において公知のものを用いることができる。その中でも、耐熱性等の観点から、接着剤はアクリル系接着剤が好ましい。
なお、λ／４位相差板は、ラビングされた配向膜上に液晶性高分子（二色性色素なし）を塗布することによって作製してもよい。
It is preferable that the linearly polarizing plate and the λ / 4 retardation plate are fixedly laminated via an adhesive. It does not specifically limit as an adhesive agent, A well-known thing can be used in the said technical field. Among these, from the viewpoint of heat resistance and the like, the adhesive is preferably an acrylic adhesive.
The λ / 4 retardation plate may be produced by applying a liquid crystalline polymer (without dichroic dye) on the rubbed alignment film.
上記のような直線偏光板とλ／４位相差板とを含む本発明の円偏光素子は、透過率が好ましくは４５％以上、より好ましくは４８％〜８０％、さらに好ましくは５０％〜７０％である。ここで、本明細書において「透過率」とは、大塚電子株式会社製ＬＣＤ−５２００を用いて室温（２５℃）にて測定される透過率のことを意味する。 The circularly polarizing element of the present invention including the linear polarizing plate and the λ / 4 retardation plate as described above preferably has a transmittance of 45% or more, more preferably 48% to 80%, and still more preferably 50% to 70. %. Here, “transmittance” in this specification means transmittance measured at room temperature (25 ° C.) using LCD-5200 manufactured by Otsuka Electronics Co., Ltd.
本発明の円偏光素子は、従来のヨウ素系延伸偏光フィルムに比べて薄くすることが可能な直線偏光板を用いているため、軽量化及び薄型化が可能になる。また、本発明の円偏光素子は、透過率及び耐熱性が高い直線偏光板を用いているため、光取り出し効率及び耐熱性を高めることが可能になる。したがって、本発明の円偏光素子は、有機ＥＬ表示装置に用いることにより、耐熱性及び視認性を向上させた有機ＥＬ表示装置を製造することができる。 Since the circularly polarizing element of the present invention uses a linearly polarizing plate that can be made thinner than a conventional iodine-based stretched polarizing film, it can be reduced in weight and thickness. Moreover, since the circularly-polarizing element of this invention uses the linearly-polarizing plate with a high transmittance | permeability and heat resistance, it becomes possible to improve light extraction efficiency and heat resistance. Therefore, when the circularly polarizing element of the present invention is used in an organic EL display device, an organic EL display device with improved heat resistance and visibility can be produced.
以下、実施例により本発明の詳細を説明するが、これらによって本発明が限定されるものではない。
（実施例１）
基板にポリイミド配向膜を形成した後、所定の方向に沿ってラビングして配向処理し、液晶性高分子及び二色性色素を含む組成物を配向膜上に塗布して塗膜を形成し、この塗膜をＮ２雰囲気中で光照射して硬化させることにより、厚さが２μｍの直線偏光板を作製した。得られた直線偏光板を、接着剤を用いてλ／４位相差板と貼り合わせることにより、円偏光素子を作製した。
EXAMPLES Hereinafter, although an Example demonstrates the detail of this invention, this invention is not limited by these.
Example 1
After the polyimide alignment film is formed on the substrate, the alignment treatment is performed by rubbing along a predetermined direction, a composition containing a liquid crystalline polymer and a dichroic dye is applied on the alignment film to form a coating film, This coating film was irradiated with light in an N 2 atmosphere and cured to produce a linear polarizing plate having a thickness of 2 μm. The obtained linearly polarizing plate was bonded to a λ / 4 retardation plate using an adhesive to produce a circularly polarizing element.
（比較例１）
直線偏光板として、従来のヨウ素系延伸偏光フィルム（厚さ１６０μｍ）を用いたこと以外は実施例１と同様にして円偏光素子を作製した。
(Comparative Example 1)
A circularly polarizing element was produced in the same manner as in Example 1 except that a conventional iodine-based stretched polarizing film (thickness: 160 μm) was used as the linear polarizing plate.
上記の実施例及び比較例で得られた円偏光素子について、大塚電子株式会社製ＬＣＤ−５２００を用い、透過率を室温（２５℃）にて測定した。
また、上記の実施例及び比較例で得られた円偏光素子に接着剤を用いて反射率が８．３％の反射板を貼り付け、王子製紙株式会社製ＣＭ３６００Ａを用い、反射率を室温にて測定した。
About the circularly polarizing element obtained by said Example and comparative example, the transmittance | permeability was measured at room temperature (25 degreeC) using Otsuka Electronics Co., Ltd. LCD-5200.
In addition, a reflective plate having a reflectance of 8.3% is attached to the circularly polarizing elements obtained in the above-described Examples and Comparative Examples using an adhesive, and the reflectance is set to room temperature using CM3600A manufactured by Oji Paper Co., Ltd. Measured.
透過率に関し、実施例１は５１％であったのに対し、比較例１は４５％未満であった。また、反射率に関し、実施例１は１．１％であったのに対し、比較例１では０．９％であった。したがって、実施例１の円偏光素子は、比較例１の円偏光素子に比べて、反射防止機能が同程度に確保しつつ透過率を向上させることができた。 Regarding transmittance, Example 1 was 51%, while Comparative Example 1 was less than 45%. Further, regarding the reflectance, Example 1 was 1.1%, while Comparative Example 1 was 0.9%. Therefore, the circularly polarizing element of Example 1 was able to improve the transmittance while ensuring the same antireflection function as the circularly polarizing element of Comparative Example 1.
次に、実施例１及び比較例１の円偏光素子を１５０℃で３時間加熱することによって耐熱性の評価を行った。その結果、実施例１の円偏光素子では、偏光特性や透過率等の特性に変化がなかったものの、比較例１の円偏光素子では、偏光特性が低下し、直線偏光板としての機能を有しないことが確認された。 Next, the heat resistance was evaluated by heating the circularly polarizing elements of Example 1 and Comparative Example 1 at 150 ° C. for 3 hours. As a result, in the circularly polarizing element of Example 1, there was no change in characteristics such as polarization characteristics and transmittance, but in the circularly polarizing element of Comparative Example 1, the polarization characteristics were lowered and the linear polarizing plate had a function. It was confirmed not to.
次に、λ／４位相差板として、逆波長分散性のλ／４位相差板を用いて実験を行った。その結果、逆波長分散性のλ／４位相差板を用いた場合、通常のλ／４位相差板を用いた場合に比べて、反射率が約１割程度減少した。したがって、波長分散性のλ／４位相差板を用いることにより、反射防止機能を向上させることができた。 Next, an experiment was performed using a λ / 4 retardation plate having a reverse wavelength dispersion as the λ / 4 retardation plate. As a result, the reflectance was reduced by about 10% when the λ / 4 phase difference plate having reverse wavelength dispersion was used, compared to the case of using a normal λ / 4 phase difference plate. Therefore, the antireflection function could be improved by using the wavelength dispersive λ / 4 retardation plate.
以上の結果からわかるように、本発明によれば、外光の強い環境下であっても優れた反射防止機能を有し、しかも耐熱性及び光取り出し効率が高い有機ＥＬ表示装置用円偏光素子を提供することができる。また、本発明によれば、耐熱性及び視認性を向上させた有機ＥＬ表示装置を提供することができる。 As can be seen from the above results, according to the present invention, the circularly polarizing element for an organic EL display device has an excellent antireflection function even under an environment with strong external light, and has high heat resistance and high light extraction efficiency. Can be provided. Moreover, according to the present invention, an organic EL display device with improved heat resistance and visibility can be provided.
Claims (4)
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| JP2015146504A JP2017026879A (en) | 2015-07-24 | 2015-07-24 | Circular polarization element for organic el display and organic el display |
| KR1020160087579A KR20170012032A (en) | 2015-07-24 | 2016-07-11 | Polarizing Elements for Organic EL Display Devices, and Organic EL Display Devices |
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|---|---|---|---|---|
| JP2018147761A (en) * | 2017-03-07 | 2018-09-20 | エルジー ディスプレイ カンパニー リミテッド | Display device and manufacturing method thereof |
| WO2019107365A1 (en) * | 2017-11-30 | 2019-06-06 | 住友化学株式会社 | Optically anisotropic film |
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| JP6010841B2 (en) | 2012-05-31 | 2016-10-19 | 株式会社ポラテクノ | ORGANIC EL DISPLAY DEVICE AND POLARIZING ELEMENT FOR ORGANIC EL DISPLAY DEVICE |
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| JP2018147761A (en) * | 2017-03-07 | 2018-09-20 | エルジー ディスプレイ カンパニー リミテッド | Display device and manufacturing method thereof |
| WO2019107365A1 (en) * | 2017-11-30 | 2019-06-06 | 住友化学株式会社 | Optically anisotropic film |
| JPWO2019107365A1 (en) * | 2017-11-30 | 2020-12-24 | 住友化学株式会社 | Optically anisotropic film |
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