JP4530256B2 - 位相差フィルム、その製造方法、およびこれを用いた光学フィルム - Google Patents
位相差フィルム、その製造方法、およびこれを用いた光学フィルム Download PDFInfo
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- JP4530256B2 JP4530256B2 JP2004010827A JP2004010827A JP4530256B2 JP 4530256 B2 JP4530256 B2 JP 4530256B2 JP 2004010827 A JP2004010827 A JP 2004010827A JP 2004010827 A JP2004010827 A JP 2004010827A JP 4530256 B2 JP4530256 B2 JP 4530256B2
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
- C08J7/123—Treatment by wave energy or particle radiation
-
- 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
- G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3016—Polarising elements involving passive liquid crystal elements
-
- 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
-
- 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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
-
- 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
-
- C—CHEMISTRY; METALLURGY
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Description
前記配向フィルムが、本発明の位相差フィルムであって、前記位相差フィルムの配向方向が異なる表面に前記複屈折層を直接形成することによって、前記位相差フィルム内部の配向方向と前記複屈折層の配向方向とを異なる方向に設定することを特徴とする。
nx>ny>nz ・・・(II)
nx>ny=nz ・・・(III)
前記式(I)〜(III)において、nx、nyおよびnzとは、それぞれ前記位相差フィルムにおけるX軸、Y軸およびZ軸方向の屈折率を示し、前記X軸方向とは、前記位相差フィルムの面内において最大の屈折率を示す軸方向であり、Y軸は、前記面内において前記X軸に対して垂直な軸方向であり、Z軸は、前記X軸およびY軸に垂直な厚み方向を示す(以下、同様)。
nx>ny>nz ・・・(II)
nx>ny=nz ・・・(III)
前記ポリマーフィルムの調製方法は、特に制限されないが、前記非液晶性ポリマーが、例えば、前述のようなポリイミド等の場合、非液晶性ポリマーを含む塗工液を基材表面に塗工して形成された複屈折層が使用できる。前記非液晶性ポリマーであれば、その性質上、前記基材の配向の有無に関わらず面配向、すなわち、前記塗工膜が、例えば、乾燥によって膜厚方向に収縮し、分子配向に異方性が生じる現象が生じるため、前記複屈折層は、前記式(I)に示す負の一軸性の光学特性を示すのである。前記複屈折層は、前記基材から剥離して単独で使用してもよいし、基材との積層体として使用してもよい。
前記式において、nxおよびnzは、それぞれ前記複屈折層におけるX軸およびZ軸方向の屈折率を示し、前記X軸方向とは、前記複屈折層の面内において最大の屈折率を示す軸方向であり、Z軸は、前記X軸に垂直な厚み方向を示す。
Rth=[[(nx+ny)/2]-nz]・d
また、前記透明保護層は、さらに光学補償機能を有するものでもよい。このように光学補償機能を有する透明保護層としては、例えば、液晶セルにおける位相差に基づく視認角の変化が原因である、着色等の防止や、良視認の視野角の拡大等を目的とした公知のものが使用できる。具体的には、例えば、前述した透明樹脂を一軸延伸または二軸延伸した各種延伸フィルムや、液晶ポリマー等の配向フィルム、透明基材上に液晶ポリマー等の配向層を配置した積層体等があげられる。これらの中でも、良視認の広い視野角を達成できることから、前記液晶ポリマーの配向フィルムが好ましく、特に、ディスコチック系やネマチック系の液晶ポリマーの傾斜配向層から構成される光学補償層を、前述のトリアセチルセルロースフィルム等で支持した光学補償位相差板が好ましい。このような光学補償位相差板としては、例えば、富士写真フィルム株式会社製「WVフィルム」等の市販品があげられる。なお、前記光学補償位相差板は、前記位相差フィルムやトリアセチルセルロースフィルム等のフィルム支持体を2層以上積層させることによって、位相差等の光学特性を制御したもの等でもよい。
2、2’−ビス(3、4−ジカルボキフェニル)ヘキサフルオロプロパンおよび2、2’−ビス(トリフオロメチル)−4、4’−ジアミノビフェニル)を用いて、前記式(6)で表されるポリイミド粉末を合成した。なお、このポリイミドの重量平均分子量は13万であった。
偏光UV光を、二軸性ポリイミドフィルムの延伸方向に対して45°の方向に照射した以外は、参考例1の同様の方法で、TACフィルムと表面改質ポリイミドフィルムとの積層体を作製し、これを基材サンプルとした。
二軸性ポリイミドフィルムに偏光UV光照射を行っていない以外は、前記参考例1と同様にして、TACフィルムと二軸性ポリイミドフィルムとの積層体を作製し、これを基材サンプルとした。
(1) まず、偏光UV光を照射する前の二軸性ポリイミドフィルムについて、分光エリプソメーター(商品名M-220:日本分光社製)を用いて、その遅相軸方位を検出した。
(2) つぎに、偏光UV光を照射した後の二軸性ポリイミドフィルム(表面改質位相差フィルム)について、同様にして、その遅相軸方位を検出した。
(3) さらに、前記二軸性ポリイミドフィルムの偏光UV照射表面に、ネマチック液晶を含む液晶層を形成し、液晶層の遅相軸方位を検出した。この段階で検出した遅相軸方位は、液晶層の遅相軸方位であり、これは、表面改質されたポリイミドフィルムの表面における屈折率異方性の大きい方位に相当する。なお、比較例1の二軸性ポリイミドフィルムについては、偏光UV光を照射することなく、その表面に直接液晶層を形成した。
ネマチック液晶化合物(商品名Paliocolor LC242:BASF社製)20重量%、光開始剤(商品名イルガキュア907:チバスペシャルティーケミカルズ社製)1重量%、およびトルエン79重量%を含む液晶溶液を調製した。そして、TACフィルム基材(長さ200m、幅350mm、厚み80μm、富士写真フィルム製)の表面にラビング処理を施し、この表面に、前記液晶溶液をスピンコーティングによって塗布し、90℃で3分間乾燥させて、塗工膜を形成した。この塗工膜に、高圧水銀ランプにより、800mJ/cm2(波長365nm)のUV光を照射し、液晶材料を硬化させて硬化膜を形成した。なお、液晶化合物は、基材上で配向した後、その状態のままUV照射により重合しているため、得られた硬化膜は非液晶性である。この硬化膜は、一軸配向した光学特性「nx>ny=nz」を示す、一軸性ポリマーフィルム(positive A-plate)であった。また、前記基材と硬化膜との積層体を、面内に360°回転させながら、クロスニコル下で偏光顕微鏡観察すると、前記硬化膜の配向軸方向と偏光板の偏光軸とが一致する場合(90°おきに4箇所)、黒表示になることを確認した。
以下に示す方法によって、TACフィルム上に、「nx>ny=nz」を示す一軸性ポリマーフィルムの形成に替えて、負の光学特性「nx=ny>nz」を示す一軸性ポリマーフィルム(negative C-plate)を形成した以外は、前記実施例3と同様にして前記ポリマーフィルムの改質を行った。なお、前記negative C-plateは、以下に示す方法によって形成した。そして、得られた表面改質位相差フィルムについて、前記実施例3と同様にして、配向の変化を評価した。その結果、実施例3と同様の効果が得られた。
Claims (4)
- 配向フィルム表面に、ネマチック相を示す液晶性化合物を含む塗工液を塗工して塗工膜を形成する工程、
前記塗工膜に加熱処理を施して前記液晶化合物を前記配向フィルムの配向方向に応じて配向させた後、前記液晶化合物を重合させることによって、非液晶性ポリマーを含み、かつ複屈折性を示すポリマーフィルムを形成する工程、
前記複屈折性を示すポリマーフィルムの少なくとも一方の表面に偏光を照射して、前記ポリマーフィルムの偏光を照射した表面のみ、その配向方向を変化させる工程を含む位相差フィルムの製造方法。 - 偏光が、直線偏光である請求項1記載の製造方法。
- 偏光が、紫外線偏光である請求項1または2記載の製造方法。
- 偏光が、200〜400nmの紫外線偏光である請求項3記載の製造方法。
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KR1020067009425A KR100801911B1 (ko) | 2004-01-19 | 2004-12-17 | 위상차 필름, 위상차 필름의 제조 방법, 적층 위상차필름의 제조 방법, 광학 필름 및 화상 표시 장치 |
EP04807294A EP1701183A4 (en) | 2004-01-19 | 2004-12-17 | PHASE CONTRAST FILM, PROCESS FOR PREPARING A PHASE CONTRAST FILM, PROCESS FOR PRODUCING A LAMINATED PHASE CONTRAST FILM, OPTICAL FILM AND IMAGE DISPLAY UNIT |
PCT/JP2004/018936 WO2005069047A1 (ja) | 2004-01-19 | 2004-12-17 | 位相差フィルム、位相差フィルムの製造方法、積層位相差フィルムの製造方法、光学フィルムおよび画像表示装置 |
US10/579,467 US20070134441A1 (en) | 2004-01-19 | 2004-12-17 | Retardation film, method for manufacturing retardation film, method for manufacturing laminated retardation film, optical film, and image display apparatus |
CNB2004800405816A CN100429537C (zh) | 2004-01-19 | 2004-12-17 | 相位差薄膜、相位差薄膜的制造方法、层叠相位差薄膜的制造方法、光学薄膜和图像显示装置 |
TW093139990A TW200530639A (en) | 2004-01-19 | 2004-12-22 | Phasedifferential film, process for producing phasedifferential film, process for producing laminated phasedifferntial film, optical film and image display unit |
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CN100482010C (zh) * | 2005-12-08 | 2009-04-22 | 东莞莫仕连接器有限公司 | 电致发光灯以及其与金属按键板的组合以及其制造方法 |
WO2007097159A1 (ja) * | 2006-02-20 | 2007-08-30 | Nitto Denko Corporation | 液晶パネル、それを用いた液晶表示装置、および液晶パネルの製造方法 |
US20100225854A1 (en) * | 2006-02-20 | 2010-09-09 | Nitto Denko Corporation | Liquid crystal panel and liquid crystal display apparatus using the panel |
JP4978995B2 (ja) * | 2006-11-08 | 2012-07-18 | 株式会社ジャパンディスプレイイースト | 液晶表示装置 |
JP5004651B2 (ja) * | 2007-05-10 | 2012-08-22 | 日東電工株式会社 | 光学フィルムの製造方法、光学フィルム及び液晶表示装置 |
JP5004652B2 (ja) * | 2007-05-10 | 2012-08-22 | 日東電工株式会社 | 光学フィルムの製造方法、光学フィルム及び液晶表示装置 |
US8730435B2 (en) | 2009-07-17 | 2014-05-20 | Jnc Corporation | Liquid crystal display device having retardation film formed of liquid crystalline polyimide having photoreactive group |
TWI414833B (zh) * | 2009-12-14 | 2013-11-11 | Ind Tech Res Inst | 低色偏光學元件及包含此光學元件之背光模組及液晶顯示器 |
TWI453509B (zh) * | 2011-12-14 | 2014-09-21 | Ind Tech Res Inst | 雙光軸相位差膜及其製造方法 |
JP2014044394A (ja) * | 2012-03-30 | 2014-03-13 | Nitto Denko Corp | 長尺位相差フィルム、円偏光板及び有機elパネル |
KR101566077B1 (ko) * | 2012-07-25 | 2015-11-05 | 제일모직주식회사 | 광학필름, 그 제조방법 및 이를 포함하는 액정 디스플레이 |
KR20170077817A (ko) * | 2015-12-28 | 2017-07-06 | 스미또모 가가꾸 가부시끼가이샤 | 광학 적층체 |
WO2017191778A1 (ja) * | 2016-05-02 | 2017-11-09 | 富士フイルム株式会社 | 透明スクリーンおよび画像表示システム |
WO2018019691A1 (en) * | 2016-07-29 | 2018-02-01 | Rolic Ag | Method for generating alignment on top of a liquid crystal polymer material |
JP7196278B2 (ja) * | 2019-02-22 | 2022-12-26 | 林テレンプ株式会社 | 光学積層体およびその製造方法 |
JP2020194058A (ja) * | 2019-05-28 | 2020-12-03 | 日東電工株式会社 | 光学積層体、面照明装置および画像表示装置 |
KR102147342B1 (ko) * | 2019-09-30 | 2020-08-24 | 에스케이이노베이션 주식회사 | 폴리이미드계 필름 및 이를 이용한 윈도우 커버 필름 |
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- 2004-12-17 WO PCT/JP2004/018936 patent/WO2005069047A1/ja not_active Application Discontinuation
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- 2004-12-17 KR KR1020067009425A patent/KR100801911B1/ko active IP Right Grant
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US20070134441A1 (en) | 2007-06-14 |
EP1701183A4 (en) | 2007-12-19 |
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CN1906508A (zh) | 2007-01-31 |
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