JP6202074B2 - 波長変換シート - Google Patents
波長変換シート Download PDFInfo
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- JP6202074B2 JP6202074B2 JP2015227718A JP2015227718A JP6202074B2 JP 6202074 B2 JP6202074 B2 JP 6202074B2 JP 2015227718 A JP2015227718 A JP 2015227718A JP 2015227718 A JP2015227718 A JP 2015227718A JP 6202074 B2 JP6202074 B2 JP 6202074B2
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- inorganic thin
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- 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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- G02F1/01—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
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Description
本実施形態のガスバリア性積層フィルムは、第1の基材、該第1の基材上に形成された第1の無機薄膜層、及び、該第1の無機薄膜層上に形成された第1のガスバリア性被覆層、を有する第1のバリアフィルムと、第2の基材、該第2の基材上に形成された第2の無機薄膜層、及び、該第2の無機薄膜層上に形成された第2のガスバリア性被覆層、を有する第2のバリアフィルムと、上記第1のバリアフィルムと上記第2のバリアフィルムとを貼り合わせる接着層と、を少なくとも備える。ここで、上記第1のバリアフィルムと上記第2のバリアフィルムとは、上記第1のガスバリア性被覆層と上記第2のガスバリア性被覆層とが対向するように、上記接着層を介して積層された状態となっている。また、上記第1の無機薄膜層と上記第2の無機薄膜層との間の距離は1.0μm以上であり、上記第1のガスバリア性被覆層と上記接着層との屈折率差、及び、上記第2のガスバリア性被覆層と上記接着層との屈折率差は、いずれも0.05以下である。本実施形態のガスバリア性積層フィルムは、第1のバリアフィルム又は第2のバリアフィルム上にマット層を更に備えていてもよい。
第1及び第2の基材11,21は、特に限定されるものではないが、高分子フィルムであることが望ましく、全光線透過率が85%以上の高分子フィルムであることがより望ましい。高分子フィルムの材質としては、例えば、ポリエチレンテレフタレート、ポリブチレンテレフタレート及びポリエチレンナフタレート等のポリエステル;ナイロン等のポリアミド;ポリプロピレン及びシクロオレフィン等のポリオレフィン;ポリカーボネート;並びにトリアセチルセルロース等が挙げられるが、これらに限定されない。高分子フィルムはポリエステルフィルム、ポリアミドフィルム又はポリオレフィンフィルムであることが好ましく、ポリエステルフィルム又はポリアミドフィルムであることがより好ましく、透明性、加工適正及び密着性の観点から、ポリエチレンテレフタレートフィルムであることが更に好ましい。また、ポリエチレンテレフタレートフィルムは、透明性及びガスバリア性の観点から、二軸延伸ポリエチレンテレフタレートフィルムであることが好ましい。
第1及び第2の無機薄膜層13,23は、例えば、真空蒸着法、スパッタリング法、又はプラズマCVD(PECVD)法により形成することができる。真空蒸着法としては、抵抗加熱式真空蒸着法、電子ビーム(Electron Beam)加熱式真空蒸着法、誘導加熱式真空蒸着法がより好ましく、スパッタリング法としては、反応性スパッタリング法、デュアルマグネトロンスパッタリング法がより好ましい。膜の均質性の観点からはスパッタリング法が好ましく、コストの観点からは、真空蒸着法が好ましく、目的、用途に応じて選択することができる。
第1及び第2のガスバリア性被覆層14,24は、後工程での二次的な各種損傷を防止すると共に、高いバリア性を付与するために設けられるものである。第1及び第2のガスバリア性被覆層14,24は、シロキサン結合を含んでいてもよい。第1及び第2のガスバリア性被覆層14,24は、大気中で成膜されたものでも真空中で成膜されたものでもよい。第1及び第2のガスバリア性被覆層14,24を大気中で形成する場合は、例えば、ポリビニルアルコール、ポリビニルピロリドン、エチレンビニルアルコールのような極性を持つ化合物、ポリ塩化ビニリデン等の塩素を含む化合物、及びSi原子を含む化合物、Ti原子を含む化合物、Al原子を含む化合物、Zr原子を含む化合物等を含有する塗布液を第1及び第2の無機薄膜層13,23上に塗布し、乾燥硬化させることで形成することができる。
R1 n(OR2)4−nSi …(1)
[式中、nは0〜3の整数を示し、R1及びR2はそれぞれ独立に炭化水素基を示し、好ましくは炭素数1〜4のアルキル基を示す。]
R1 n(OR2)4−nTi …(2)
[式中、nは0〜3の整数を示し、R1及びR2はそれぞれ独立に炭化水素基を示し、好ましくは炭素数1〜4のアルキル基を示す。]
R1 m(OR2)3−mAl …(3)
[式中、mは0〜2の整数を示し、R1及びR2はそれぞれ独立に炭化水素基を示し、好ましくは炭素数1〜4のアルキル基を示す。]
R1 n(OR2)4−nZr …(4)
[式中、nは0〜3の整数を示し、R1及びR2はそれぞれ独立に炭化水素基を示し、好ましくは炭素数1〜4のアルキル基を示す。]
接着層4は、図1に示すように、第1のバリアフィルム1と第2のバリアフィルム2とを貼り合わせて積層するために、第1のバリアフィルム1と第2のバリアフィルム2との間に設けられている。接着層4としては、高分子フィルム用の接着剤又は粘着剤として一般的なものを使用することができ、第1のバリアフィルム1及び第2のバリアフィルム2の貼り合わせる側の表面に応じて適宜選択される。接着層4の材料の候補としては、エポキシ系、ポリエステル系、アクリル系、ゴム系、フェノール系、及びウレタン系等の接着剤又は粘着剤が挙げられる。
マット層5は、1以上の光学的機能や帯電防止機能を発揮させるために、第2のバリアフィルム2の第2の基材21表面に設けられている。ここで、光学的機能としては、特に限定されるものではないが、干渉縞(モアレ)防止機能、反射防止機能、拡散機能等が挙げられる。これらの中でも、マット層5は、光学的機能として少なくとも干渉縞防止機能を有することが好ましい。本実施形態では、マット層5が少なくとも干渉縞防止機能を有するものである場合について説明する。
図2は、本発明の波長変換シートの一実施形態を示す模式断面図である。図2に示した波長変換シートは、量子ドット等の蛍光体を含んでおり、例えばLED波長変換用として、バックライトユニットに用いることができるものである。
ガスバリア性積層フィルム100,100としては、図1に示したガスバリア性積層フィルム100を用いることができる。波長変換シート200において、蛍光体層7の一方の面7a側に配置されるガスバリア性積層フィルム100と、他方の面7b側に配置されるガスバリア性積層フィルム100とは、同一であっても異なっていてもよい。
蛍光体層7は、封止樹脂9及び蛍光体8を含む数十〜数百μmの厚さの薄膜である。封止樹脂9としては、例えば、感光性樹脂又は熱硬化性樹脂を使用することができる。封止樹脂9の内部には、蛍光体8が1種以上混合された状態で封止されている。封止樹脂9は、蛍光体層7と一対のガスバリア性積層フィルム100,100とを積層する際に、これらを接合するとともに、これらの空隙を埋める役割を果たす。また、蛍光体層7は、1種類の蛍光体8のみが封止された蛍光体層が2層以上積層されたものであってもよい。それら1層又は2層以上の蛍光体層に用いられる2種類以上の蛍光体8は、励起波長が同一のものが選択される。この励起波長は、LED光源が照射する光の波長に基づいて選択される。2種類以上の蛍光体8の蛍光色は相互に異なる。LED光源として青色LED(ピーク波長450nm)を用いつつ、2種類の蛍光体8を用いる場合、各蛍光色は、好ましくは、赤色、緑色である。各蛍光の波長、及びLED光源が照射する光の波長は、カラーフィルタの分光特性に基づき選択される。蛍光のピーク波長は、例えば赤色が650nm、緑色が550nmである。
図3にバックライトユニットの一実施形態を示す。本実施形態のバックライトユニット500は、LED(発光ダイオード)光源30と導光板40と波長変換シート200とを備える。また、図では省略されているが、バックライトユニット500は、反射板や、拡散板、プリズムシートなどを備えていてもよい。
第1の基材として、厚さ23μmの二軸延伸ポリエチレンテレフタレート(PET)フィルムを用意した。電子ビーム加熱式の真空蒸着装置を用いて、酸化珪素材料(キヤノンオプトロン株式会社製)を1.5×10−2Paの圧力下で電子ビーム加熱によって蒸発させ、上記PETフィルム上に第1の無機薄膜層として厚さ30nmの酸化珪素層を形成した。なお、蒸着における加速電圧は40kVであり、エミッション電流は0.2Aであった。
接着剤の塗布量を調整して接着層の硬化後の厚さを3.0μmとした以外は実施例1と同様にしてガスバリア性積層フィルムを得た。
接着剤の塗布量を調整して接着層の硬化後の厚さを9.0μmとした以外は実施例1と同様にしてガスバリア性積層フィルムを得た。
接着剤として、実施例1で用いたアクリル系粘着剤塗液に多孔質シリカ微粒子分散液を添加したものを用い、接着層の屈折率が1.45となるように調整したこと以外は実施例1と同様にして、ガスバリア性積層フィルムを得た。
接着剤として、実施例1で用いたアクリル系粘着剤塗液にジルコニア微粒子分散液を添加したものを用い、接着層の屈折率が1.55となるように調整したこと以外は実施例1と同様にして、ガスバリア性積層フィルムを得た。
基材として、厚さ23μmの二軸延伸ポリエチレンテレフタレート(PET)フィルムを用意した。電子ビーム加熱式の真空蒸着装置を用いて、酸化珪素材料(キヤノンオプトロン株式会社製)を1.5×10−2Paの圧力下で電子ビーム加熱によって蒸発させ、上記PETフィルム上に無機薄膜層として厚さ30nmの酸化珪素層を形成した。なお、蒸着における加速電圧は40kVであり、エミッション電流は0.2Aであった。
接着剤の塗布量を調整して接着層の硬化後の厚さを0.3μmとした以外は実施例1と同様にしてガスバリア性積層フィルムを得た。
接着剤として、実施例1で用いたアクリル系粘着剤塗液に多孔質シリカ微粒子分散液を添加したものを用い、接着層の屈折率が1.40となるように調整したこと以外は実施例1と同様にして、ガスバリア性積層フィルムを得た。
接着剤として、実施例1で用いたアクリル系粘着剤塗液にジルコニア微粒子分散液を添加したものを用い、接着層の屈折率が1.60となるように調整したこと以外は実施例1と同様にして、ガスバリア性積層フィルムを得た。
実施例及び比較例で作製したガスバリア性積層フィルムにおける接着層及びガスバリア性被覆層の屈折率は、各層を形成して厚さを特定した後、分光反射率曲線について光学シミュレーションを行うことにより求めた。なお、実施例1〜5及び比較例2〜4において、第1のガスバリア性被覆層と第2のガスバリア性被覆層の屈折率は同一である。また、比較例1においては、接着層に隣接するガスバリア性被覆層の屈折率を測定した。また、屈折率の測定結果を用いて、接着層とガスバリア性被覆層との屈折率差を求めた。結果を表1に示す。
実施例及び比較例で作製したガスバリア性積層フィルムの光透過率は、分光光度計(商品名、SHIMAZU UV−2450)を用い、波長450nm、550nm、及び650nmにおいて測定した。測定にあたっては、ガスバリア性積層フィルムのマット層とは反対側(PETフィルム側)の面から測定光を照射した。ここで、最も重要な透過率は波長450nmの青色光の透過率であり、その値が85.0%以上であることが望ましい。結果を表1に示す。
Claims (3)
- 蛍光体を含む蛍光体層と、ガスバリア性積層フィルムと、を備える波長変換シートであって、
前記ガスバリア性積層フィルムが、
第1の基材、該第1の基材上に形成された第1の無機薄膜層、及び、該第1の無機薄膜層上に形成された第1のガスバリア性被覆層、を有する第1のバリアフィルムと、
第2の基材、該第2の基材上に形成された第2の無機薄膜層、及び、該第2の無機薄膜層上に形成された第2のガスバリア性被覆層、を有する第2のバリアフィルムと、
を備え、
前記第1のバリアフィルムと前記第2のバリアフィルムとが、前記第1のガスバリア性被覆層と前記第2のガスバリア性被覆層とが対向するように、接着層を介して積層された状態となっており、
前記第1の無機薄膜層と前記第2の無機薄膜層との間の距離が1.0μm以上であり、
前記第1のガスバリア性被覆層と前記接着層との屈折率差、及び、前記第2のガスバリア性被覆層と前記接着層との屈折率差が、いずれも0.05以下である、ガスバリア性積層フィルムであり、
前記蛍光体が量子ドットを含む、波長変換シート。 - 前記第1の無機薄膜層と前記第2の無機薄膜層との間の距離が20μm以下である、請求項1に記載の波長変換シート。
- 前記ガスバリア性積層フィルムが、前記第1のバリアフィルム又は前記第2のバリアフィルム上に、干渉縞防止機能を有するマット層を更に備える、請求項1又は2に記載の波長変換シート。
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- 2016-11-17 CN CN201611011324.0A patent/CN107065295A/zh active Pending
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KR20180085721A (ko) | 2018-07-27 |
JP2017094557A (ja) | 2017-06-01 |
WO2017086382A1 (ja) | 2017-05-26 |
EP3378631B1 (en) | 2020-07-15 |
EP3378631A1 (en) | 2018-09-26 |
EP3378631A4 (en) | 2019-07-31 |
US20180231693A1 (en) | 2018-08-16 |
CN107065295A (zh) | 2017-08-18 |
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