JP6139572B2 - 光学フィルム - Google Patents
光学フィルム Download PDFInfo
- Publication number
- JP6139572B2 JP6139572B2 JP2015002265A JP2015002265A JP6139572B2 JP 6139572 B2 JP6139572 B2 JP 6139572B2 JP 2015002265 A JP2015002265 A JP 2015002265A JP 2015002265 A JP2015002265 A JP 2015002265A JP 6139572 B2 JP6139572 B2 JP 6139572B2
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- JP
- Japan
- Prior art keywords
- film
- axis
- stretched polymer
- polymer film
- optical
- 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.)
- Expired - Fee Related
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Images
Classifications
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- 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
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
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- 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
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- G02F1/1333—Constructional arrangements; Manufacturing methods
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- 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
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- 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
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- 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
- G02F1/1336—Illuminating devices
- G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
-
- 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
- G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
-
- 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
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/12—Biaxial compensators
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Description
本出願は2008年3月31日出願の米国特許仮出願第61/041112号の利益を主張するものであり、その開示の全容をここに援用するものである。
以下の同一出願人に所有され、同時係属の米国特許出願は本明細書に組み込まれる:米国特許出願第61/040,910号、表題「LOW LAYER COUNT REFLECTIVE POLARIZER WITH OPTIMIZED GAIN」(代理人整理番号64121US002)、及び米国特許出願第61/041092号、表題「ADHESIVE LAYER FOR MULTILAYER OPTICAL FILM」(Jones et al.)(代理人整理番号64212US002)。
本開示の一実施形態では、実質的に一軸配向PETフィルムは、(1)約0.6の固有粘度を有するポリエチレンテレフタレート樹脂を約1,680kg/hrで延伸することによって、約42.7m/minの速度で0.64mm厚のキャストウェブを作り、(2)キャストウェブを70℃で事前加熱し、そのキャストウェブを長さ方向若しくは機械方向(MD)でわずかに、その当初の非延伸寸法よりも1.17倍延伸し、(3)このウェブを約4回クロスウェブ方向若しくは幅出し方向(TD)に95℃で事前加熱及び延伸し、(4)ウェブを155℃の温度でヒートセットし、(5)このウェブをTDで2.5%弛緩させることによって調製された。優れたクロスウェブ及びダウンウェブキャリパー均一性を用いて大きなメモリ(3,000mm幅)で0.127mmの厚さの一軸配向PETフィルムを作ることが可能である。1.05倍〜1.30倍の範囲の機械方向の延伸比率は、実行可能であり、範囲の下限は、加工性の条件(フィルムの分離性)で決定され、範囲の上限は、用途の性能要件(偏光軸の位置合わせの維持)によって決定される。フィルムは、摂氏85度の環境に15分間供された後、評価され、収縮が決定される。収縮は、一次方向(MD及びTD)並びに製造されたフィルムの全幅を横断する様々な位置の両方で決定された。これらの値は、ウェブにわたって様々であり、フィルムの中心では0.40%MD及び0.01%TDとして測定された。フィルムの縁部から750mmの距離で測定された値は、それぞれ0.34%MD及び0.00%TD、並びに0.41%MD及び0.01%TDであった。
本開示の一実施形態では、実質的に一軸配向PETフィルムは、(1)約0.6の固有粘度を有するポリエチレンテレフタレート樹脂を約1,680kg/hrで押し出すことによって、約42.7m/minの速度で0.64mm厚のキャストウェブを作り、(2)キャストウェブを70℃で事前加熱し、そのキャストウェブを長さ方向若しくは機械方向(MD)でわずかに、その当初の非延伸寸法よりも1.17倍延伸し、(3)このウェブを約4回クロスウェブ方向若しくは幅出し方向(TD)で95℃で事前加熱及び延伸し、(4)ウェブを155℃の温度でヒートセットし、(5)このウェブをTDで2.5%弛緩させ、(6)後幅出しを使用することによって、非常に低い伸張でウェブと共にインラインで炉を110℃に設定して、連続してフィルムを弛緩させ、ダウンウェブ方向でフィルムの収縮を更に小さくすることによって調製された。優れたクロスウェブ及びダウンウェブキャリパー均一性を用いて大きなメモリ(3,000mm幅)で0.127mmの厚さの一軸配向PETフィルムを作ることが可能である。1.05倍〜1.30倍の範囲の機械方向の延伸比率は、実行可能であり、範囲の下限は、加工性の条件(フィルムの分離性)で決定され、範囲の上限は、用途の性能要件(偏光軸の位置合わせの維持)によって決定される。3〜7倍の範囲での幅出し方向の延伸割合は、適切である。ヒートセットの温度は、結晶化度を向上させるために十分高いが、フィルムの輝度又は分離性との加工性に悪影響、あるいはウェブの幅出しクリップへの接着を避けるために十分低く保たれ得る。好適な熱設定温度は、一般に約170℃よりも低い。100℃〜140℃の範囲での後幅出しの炉の温度が実施可能であり、温度範囲の下限は製品用途においてフィルムへの寸法安定性の要件によって決定され、温度範囲の上限は、低伸張下の弛緩中に、クロスウェブ方向において望ましくないフィルムの変形によって決定される。
本発明の実施態様の一部を以下の項目1−24に列記する。
[1]
光学フィルムであって、
通過軸を有する反射偏光子と、
延伸ポリマーフィルムであって、最大延伸の方向におけるx軸、前記延伸ポリマーフィルムの面に対して垂直なz軸、並びに前記x軸及び前記z軸の両方に対して垂直なy軸を有する延伸ポリマーフィルムとを含み、前記延伸ポリマーフィルムは、前記反射偏光子にラミネートされ、
前記延伸ポリマーフィルムが、x−z面で前記z軸に対して少なくとも約60度の空気中の入射角で屈折率対称点を呈する、光学フィルム。
[2]
前記延伸ポリマーフィルムが、モノリシックである、項目1に記載の光学フィルム。
[3]
前記延伸ポリマーフィルムが、ポリエチレンテレフタレートを含む、項目1に記載の光学フィルム。
[4]
前記延伸ポリマーフィルムの前記y軸と前記反射偏光子の前記通過軸との間の角度が、約10度未満である、項目1に記載の光学フィルム。
[5]
前記延伸ポリマーフィルムが光学層と前記反射偏光子との間にあるように、前記延伸ポリマーフィルムに近接して配置される前記光学層を更に含む、項目1に記載の光学フィルム。
[6]
前記光学層が、拡散性である、項目5に記載の光学フィルム。
[7]
前記光学層が、複数の屈折素子を含む、項目5に記載の光学フィルム。
[8]
前記複数の屈折素子が、ビーズを含む、項目7に記載の光学フィルム。
[9]
前記複数の屈折素子が、細長いプリズムを含む、項目7に記載の光学フィルム。
[10]
前記延伸ポリマーフィルム及び前記反射偏光子が、接着剤と共にラミネートされる、項目1に記載の光学フィルム。
[11]
光学フィルムであって、
通過軸を有する反射偏光子と、
延伸ポリマーフィルムであって、最大延伸の方向におけるx軸、前記延伸ポリマーフィルムの面に対して垂直なz軸、並びに前記x軸及び前記z軸の両方に対して垂直なy軸を有する延伸ポリマーフィルムとを含み、前記延伸ポリマーフィルムは、前記反射偏光子に取り付けられ、
前記延伸ポリマーフィルムは、x−z面で前記z軸に対して少なくとも約60度の空気中の入射角で屈折率対称点を呈し、更に前記延伸ポリマーフィルムは、前記反射偏光子内に存在しないポリマー材料を含む、光学フィルム。
[12]
光学フィルムであって、
第1及び第2主表面を有する反射偏光子と、
前記反射偏光子の前記第1主表面に、第1接着層と共にラミネートされる第1延伸ポリマーフィルムと、
前記反射偏光子の前記第2主表面に、第2接着層と共にラミネートされる第2延伸ポリマーフィルムと、
光学層であって、前記第2延伸ポリマーフィルムが前記光学層と前記反射偏光子との間であるように、前記第2延伸ポリマーフィルムに近接して配置される光学層とを含み、
前記第1及び第2延伸ポリマーフィルムのそれぞれは、少なくとも約90度の空気中の入射角で屈折率対称点を呈する、光学フィルム。
[13]
バックライトを含むディスプレイシステムであって、前記バックライトが、
照明装置と、
通過軸を有する反射偏光子と、
延伸ポリマーフィルムであって、最大延伸の方向におけるx軸、前記延伸ポリマーフィルムの面に対して垂直なz軸、並びに前記x軸及び前記z軸の両方に対して垂直なy軸を有する延伸ポリマーフィルムと、を含み、前記延伸ポリマーフィルムは、前記反射偏光子が前記照明装置と前記延伸ポリマーフィルムとの間にあるように配置され、
前記延伸ポリマーフィルムが、x−z面で前記z軸に対して少なくとも約60度の空気中の入射角で屈折率対称点を呈する、ディスプレイシステム。
[14]
二色性偏光子を更に含み、前記延伸ポリマーフィルムが前記反射偏光子と前記二色性偏光子との間に配置される、項目13に記載のディスプレイシステム。
[15]
前記延伸ポリマーフィルムの前記y軸と前記反射偏光子の前記通過軸との間の角度が約10度未満である、項目13に記載のディスプレイシステム。
[16]
前記延伸ポリマーフィルムが前記照明装置と液晶パネルとの間にあるように、配置された液晶パネルを更に含む、項目13に記載のディスプレイシステム。
[17]
バックライトを含むディスプレイシステムであって、前記バックライトが、
偏光軸を有する偏光照明装置と、
延伸ポリマーフィルムであって、最大延伸の方向におけるx軸、前記延伸ポリマーフィルムの面に対して垂直なz軸、並びに前記x軸及び前記z軸の両方に対して垂直なy軸を有する延伸ポリマーフィルムと、を含み、前記延伸ポリマーフィルムが前記偏光照明装置からの偏光を受光するよう配置され、
前記延伸ポリマーフィルムが、x−z面で前記z軸に対して少なくとも約60度の空気中の入射角で屈折率対称点を呈する、ディスプレイシステム。
[18]
前記延伸ポリマーフィルムの前記y軸と前記偏光照明装置の前記偏光軸との間の角度が、約10度未満である、項目17に記載のディスプレイシステム。
[19]
バックライトを含むディスプレイシステムであって、前記バックライトが、
照明装置と、
延伸ポリマーフィルムと、を含み
前記延伸ポリマーフィルムは、約50度未満の空気中の入射角で、前記延伸ポリマーフィルムに入射する全光路に沿って、少なくとも3000nmの位相差を呈する、ディスプレイシステム。
[20]
延伸ポリマーフィルムを形成する工程を含む、光学フィルムの作製方法であって、前記延伸ポリマーフィルムを形成する工程が、
ポリエチレンテレフタレートのウェブを形成することと、
前記ウェブを、未延伸の長さ寸法の約1.05〜1.3倍の第1の量だけ、長さ方向で延伸することと、
前記ウェブを、未延伸の横断寸法の約3〜7倍の第2の量だけ、横断方向で延伸することと、
前記ウェブをヒートセットすることと、
前記ウェブを横断方向で弛緩させることと、
前記横断方向で拘束せず、かつ前記長さ方向で最小伸張としたままで、前記ウェブを炉内で弛緩させることとを含む、光学フィルムの作製方法。
[21]
得られる延伸ポリマーフィルムが、少なくとも約90度の空気中の入射角で屈折率対称点を呈する、項目20に記載の方法。
[22]
前記得られる延伸ポリマーフィルムが、約50度未満の空気中の入射角で、前記延伸ポリマーフィルムに入射する全光路に沿って、少なくとも3000nmの位相差を呈する、項目20に記載の方法。
[23]
前記延伸ポリマーフィルム上に光学層を配置することを更に含む、項目20に記載の方法。
[24]
前記延伸ポリマーフィルムを反射偏光子に取り付けることを更に含む、項目20に記載の方法。
Claims (2)
- 光学フィルムであって、
通過軸を有する反射偏光子と、
通過軸を有する二色性偏光子と、
延伸ポリマーフィルムであって、最大延伸の方向におけるx軸、前記延伸ポリマーフィルムの面に対して垂直なz軸、並びに前記x軸及び前記z軸の両方に対して垂直なy軸を有する延伸ポリマーフィルムとを含み、前記延伸ポリマーフィルムは、前記反射偏光子と前記二色性偏光子との間にラミネートされ、
前記延伸ポリマーフィルムが、x−z面で前記z軸に対して少なくとも60度の空気中の入射角で屈折率対称点を呈し、
前記延伸ポリマーフィルムが、x−z面で前記z軸に対して50度未満の空気中の入射角で、前記延伸ポリマーフィルムに入射する全光路に沿って、少なくとも3000nmの位相差を呈し、
前記延伸ポリマーフィルムのy軸と、前記二色性偏光子及び前記反射偏光子の通過軸との間の角度が10度以下である、
光学フィルム。 - バックライトを含むディスプレイシステムであって、前記バックライトが、
照明装置と、
通過軸を有する反射偏光子と、
通過軸を有する二色性偏光子と、
延伸ポリマーフィルムであって、最大延伸の方向におけるx軸、前記延伸ポリマーフィルムの面に対して垂直なz軸、並びに前記x軸及び前記z軸の両方に対して垂直なy軸を有する延伸ポリマーフィルムと、を含み、前記延伸ポリマーフィルムは、前記反射偏光子が前記照明装置と前記延伸ポリマーフィルムとの間にあるように配置され、前記延伸ポリマーフィルムが前記反射偏光子と前記二色性偏光子との間にあり、
前記延伸ポリマーフィルムが、x−z面で前記z軸に対して少なくとも60度の空気中の入射角で屈折率対称点を呈し、
前記延伸ポリマーフィルムが、x−z面で前記z軸に対して50度未満の空気中の入射角で、前記延伸ポリマーフィルムに入射する全光路に沿って、少なくとも3000nmの位相差を呈し、
前記延伸ポリマーフィルムのy軸と、前記二色性偏光子及び前記反射偏光子の通過軸との間の角度が10度以下である、
ディスプレイシステム。
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WO (1) | WO2009123949A1 (ja) |
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US9664834B2 (en) | 2017-05-30 |
CN106932964A (zh) | 2017-07-07 |
KR20110002046A (ko) | 2011-01-06 |
CN102066994B (zh) | 2017-03-22 |
CN106932964B (zh) | 2020-09-29 |
EP2265981A1 (en) | 2010-12-29 |
KR101691671B1 (ko) | 2016-12-30 |
CN102066994A (zh) | 2011-05-18 |
TWI557446B (zh) | 2016-11-11 |
US20110103036A1 (en) | 2011-05-05 |
MY167536A (en) | 2018-09-05 |
JP2015096968A (ja) | 2015-05-21 |
KR20170005381A (ko) | 2017-01-12 |
JP2011516921A (ja) | 2011-05-26 |
KR101926954B1 (ko) | 2018-12-07 |
WO2009123949A1 (en) | 2009-10-08 |
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