JP2021039275A - 積層光学フィルムおよび画像表示装置 - Google Patents
積層光学フィルムおよび画像表示装置 Download PDFInfo
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- JP2021039275A JP2021039275A JP2019161258A JP2019161258A JP2021039275A JP 2021039275 A JP2021039275 A JP 2021039275A JP 2019161258 A JP2019161258 A JP 2019161258A JP 2019161258 A JP2019161258 A JP 2019161258A JP 2021039275 A JP2021039275 A JP 2021039275A
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- meth
- optical film
- acrylate
- polarizer
- refractive index
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- 239000012788 optical film Substances 0.000 title claims abstract description 146
- 239000012790 adhesive layer Substances 0.000 claims abstract description 82
- 230000005540 biological transmission Effects 0.000 claims abstract description 46
- 239000010410 layer Substances 0.000 abstract description 19
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 abstract description 3
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- 239000010408 film Substances 0.000 description 72
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- 150000003926 acrylamides Chemical class 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 11
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical class CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 10
- 238000010894 electron beam technology Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 10
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- PUBNJSZGANKUGX-UHFFFAOYSA-N 2-(dimethylamino)-2-[(4-methylphenyl)methyl]-1-(4-morpholin-4-ylphenyl)butan-1-one Chemical compound C=1C=C(N2CCOCC2)C=CC=1C(=O)C(CC)(N(C)C)CC1=CC=C(C)C=C1 PUBNJSZGANKUGX-UHFFFAOYSA-N 0.000 description 2
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 2
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- 239000004593 Epoxy Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
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- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 2
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- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- 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
-
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Polarising Elements (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Electroluminescent Light Sources (AREA)
- Laminated Bodies (AREA)
Abstract
Description
以下に、本発明に係る積層光学フィルムが備える接着剤層について説明する。本発明において、接着剤層の厚みは薄い方が好ましく、具体的には接着剤層の厚みが5μm以下であることが好ましく、0.5〜3μmであることがより好ましい。
本発明において使用する偏光子は、特に制限されず、各種のものを使用できる。偏光子としては、例えば、ポリビニルアルコール系フィルム、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などの親水性高分子フィルムに、ヨウ素や二色性染料などの二色性材料を吸着させて一軸延伸したもの、ポリビニルアルコールの脱水処理物やポリ塩化ビニルの脱塩酸処理物などポリエン系配向フィルムなどが挙げられる。これらのなかでもポリビニルアルコール系フィルムとヨウ素などの二色性物質からなる偏光子が好適である。
第2光学フィルムは特に限定はないが、例えば反射フィルムや半透過フィルム、位相差フィルム(1/2や1/4などの波長フィルムを含む)、視角補償フィルムなどの画像表示装置などの形成に用いられることのある光学層を用いることができる。本発明においては、第2光学フィルムの厚みは薄い方が好ましく、具体的には30μm以下であることが好ましく、1〜20μmであることがより好ましい。
接着剤層を介して、少なくとも偏光子および第2光学フィルムが積層された積層光学フィルムの製造方法であって、接着剤層は、第1接着剤組成物の第1硬化物層および第2接着剤組成物の第2硬化物層を含むものであり、前記第1接着剤組成物と前記第2接着剤組成物とは少なくとも一部が異なる成分を含有するものであり、前記偏光子の貼合面に前記第1接着剤組成物を塗工する第1工程と、前記第2光学フィルムの貼合面に前記第2接着剤組成物を塗工する第2工程と、前記偏光子の前記第1接着剤組成物塗工面および前記第2光学フィルムの前記第2接着剤組成物塗工面を貼り合わせる第3工程と、前記偏光子面側または前記第2光学フィルム面側から活性エネルギー線を照射して、前記偏光子と前記第2光学フィルムとを接着させる第4工程とを含む製造方法。
図2に示す実施形態において、第2接着剤層2は、前記第1接着剤層と同様に設計可能である。ただし、第2接着剤層2においても、各光学フィルムとの界面での反射を抑制すべく、表側と裏側とで屈折率が異なるものを使用することが好ましい。具体的には、透明保護フィルム1側表面F3における面内屈折率RF3と偏光子3側表面F4における面内屈折率RF4とが異なる接着剤層を使用し、かつRF3と透明保護フィルム1の面内平均屈折率との差を0.05以内、RF4と偏光子3の面内平均屈折率との差を0.05以内となるように設計することが好ましい。この場合、画像表示装置M全体で反射率が低減され、視認性が著しく向上する。なお、本発明において偏光子の「面内平均屈折率」は、プリズムカプラーSPA−4000(サイロンテクノロジー製)を用いて、偏光子の面内の屈折率のうち、透過軸方向の屈折率および吸収軸方向の屈折率を測定し、これら平均値を偏光子の面内平均屈折率とする。測定温度は23℃、測定波長は532nmとする。
透明保護フィルムの厚みは薄い方が好ましく、具体的には30μm以下であることが好ましく、1〜20μmであることがより好ましい。透明保護フィルムとしては、透明性、機械的強度、熱安定性、水分遮断性、等方性などに優れるものが好ましい。例えば、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などのポリエステル系ポリマー、ジアセチルセルロースやトリアセチルセルロースなどのセルロース系ポリマー、ポリメチルメタクリレートなどの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(AS樹脂)などのスチレン系ポリマー、ポリカーボネート系ポリマーなどが挙げられる。また、ポリエチレン、ポリプロピレン、シクロ系ないしはノルボルネン構造を有するポリオレフィン、エチレン・プロピレン共重合体の如きポリ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などのアミド系ポリマー、イミド系ポリマー、スルホン系ポリマー、ポリエーテルスルホン系ポリマー、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、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、ビニルブチラール系ポリマー、アリレート系ポリマー、ポリオキシメチレン系ポリマー、エポキシ系ポリマー、または上記ポリマーのブレンド物なども上記透明保護フィルムを形成するポリマーの例として挙げられる。透明保護フィルム中には任意の適切な添加剤が1種類以上含まれていてもよい。添加剤としては、例えば、紫外線吸収剤、酸化防止剤、滑剤、可塑剤、離型剤、着色防止剤、難燃剤、核剤、帯電防止剤、顔料、着色剤などが挙げられる。透明保護フィルム中の上記熱可塑性樹脂の含有量は、好ましくは50〜100重量%、より好ましくは50〜99重量%、さらに好ましくは60〜98重量%、特に好ましくは70〜97重量%である。透明保護フィルム中の上記熱可塑性樹脂の含有量が50重量%以下の場合、熱可塑性樹脂が本来有する高透明性などが十分に発現できないおそれがある。
図2に示す実施形態において、前述した透明保護フィルム(第1光学フィルム)1、第1接着剤層2、偏光子(第2光学フィルム)3、第2接着剤層4および位相差フィルム(第3光学フィルム)5を備える積層光学フィルムは、粘着剤層6を介して有機発光ダイオード7に積層されている。粘着層を形成する粘着剤は特に制限されないが、例えばアクリル系重合体、シリコーン系ポリマー、ポリエステル、ポリウレタン、ポリアミド、ポリエーテル、フッ素系やゴム系などのポリマーをベースポリマーとするものを適宜に選択して用いることができる。特に、アクリル系粘着剤の如く光学的透明性に優れ、適度な濡れ性と凝集性と接着性の粘着特性を示して、耐候性や耐熱性などに優れるものが好ましく用いうる。
本発明の積層光学フィルムは有機EL画像装置や液晶表示装置などの各種画像表示装置の形成などに好ましく用いることができる。画像表示装置の形成は、従来に準じて行い得る。すなわち画像表示装置は一般に、有機発光ダイオードや液晶セルと積層光学フィルム、および必要に応じての照明システムなどの構成部品を適宜に組立てて駆動回路を組込むことなどにより形成されるが、本発明においては本発明による積層光学フィルムを用いる点を除いて特に限定はなく、従来に準じうる。
偏光子として、550nmの偏光子透過軸方向の屈折率が1.52である偏光子(厚み5μm)のものを使用した。
第2光学フィルムとして、550nmの偏光子透過軸方向の屈折率が1.65である位相差フィルム(厚み1.5μm)のものを使用した。
LCDマスターを用いて、偏光子側表面F1における面内屈折率RF1および第2光学フィルム側表面F2における面内屈折率RF2が表1に記載の値となる接着剤層を設計し、かかる接着剤層を介して第1光学フィルムおよび第2光学フィルムが積層された積層光学フィルムを設計し、積層光学フィルムへの第1光学フィルム側からランダム光を照射した際の反射率を算出した。結果を表1に示す。
LCDマスターを用いて、厚み方向で面内屈折率が一定である接着剤層(単層の接着剤層)を設計し、かかる接着剤層を介して第1光学フィルムおよび第2光学フィルムが積層された積層光学フィルムを設計し、その反射率を算出した。結果を表1に示す。
Claims (5)
- 接着剤層を介して、少なくとも偏光子および第2光学フィルムが積層された積層光学フィルムであって、
前記偏光子が前記第2光学フィルムよりも外側に位置するものであり、
前記接着剤層は、偏光子側表面F1における偏光子透過軸方向の屈折率RF1と第2光学フィルム側表面F2における偏光子透過軸方向の屈折率RF2とが異なるものであり、
前記RF1と前記偏光子の偏光子透過軸方向の屈折率との差が0.05以内であり、前記RF2と前記第2光学フィルムの偏光子透過軸方向の屈折率との差が0.05以内であることを特徴とする積層光学フィルム。 - 前記偏光子の厚みが20μm以下であり、前記第2光学フィルムの厚みが30μm以下である請求項1に記載の積層光学フィルム。
- 前記接着剤層の厚みが5μm以下である請求項1または2に記載の積層光学フィルム。
- 請求項1〜3のいずれかに記載の積層光学フィルムを備えた画像表示装置。
- 請求項1〜3のいずれかに記載の積層光学フィルムを備えた有機EL表示装置。
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WO2025004793A1 (ja) * | 2023-06-27 | 2025-01-02 | 富士フイルム株式会社 | 偏光板、表示装置 |
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