JP2008129483A - 色純度向上シート、光学装置、画像表示装置、液晶表示装置および太陽電池 - Google Patents
色純度向上シート、光学装置、画像表示装置、液晶表示装置および太陽電池 Download PDFInfo
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- JP2008129483A JP2008129483A JP2006316591A JP2006316591A JP2008129483A JP 2008129483 A JP2008129483 A JP 2008129483A JP 2006316591 A JP2006316591 A JP 2006316591A JP 2006316591 A JP2006316591 A JP 2006316591A JP 2008129483 A JP2008129483 A JP 2008129483A
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Abstract
【解決手段】本発明の色純度向上シートは、目的波長帯域以外の特定波長帯域の光を吸収し波長変換して目的波長帯域の光を発光することにより目的波長帯域の色の純度を向上させる発光手段を含む発光層11を有し、発光層11の最大吸収波長における透過率が70%以上であり、さらに、反射層12を有し、バックライト光の入射方向において、発光層11と反射層12とがこの順序で積層され、反射層12は、前記目的波長帯域以外の特定帯域の光であって発光層11に含まれる発光手段で吸収されずに透過した光の一部を選択的に反射して、再度、発光層11に入光させ、前記入光した光の一部は、発光層11を透過し、反射層12が選択的に反射する選択反射帯域が、発光層11の最大吸収波長を含むことを特徴とする。
【選択図】図1
Description
目的波長帯域以外の特定波長帯域の光を吸収し波長変換して目的波長帯域の光を発光することにより目的波長帯域の色の純度を向上させる発光手段を含む発光層を有し、
前記発光層の最大吸収波長における透過率が70%以上であり、
さらに、反射層を有し、
バックライト光の入射方向において、前記発光層と前記反射層とがこの順序で積層され、
前記反射層は、前記目的波長帯域以外の特定波長帯域の光であって前記発光層に含まれる発光手段で吸収されずに透過した光の一部を選択的に反射して、再度、前記発光層に入光させ、前記入光した光の一部は、前記発光層を透過し、
前記反射層が選択的に反射する選択反射帯域が、前記発光層の最大吸収波長を含む
ことを特徴とする。
Δλ=2λ(ne−no)/(ne+no) ・・・(I)
前記式(I)において、noは、前記液晶モノマーの正常光に対する屈折率であり、neは、前記液晶モノマーの異常光に対する屈折率であり、λは、前記コレステリック層の選択反射の中心波長である。
λ=(ne+no)P/2 ・・・(II)
前記式(II)において、Pは、前記液晶モノマーの一回転捩れに要する螺旋ピッチ長(μm)で表され、ピッチが一定であれば前記液晶モノマーの平均屈折率とピッチ長に依存する。
色純度向上シート、延伸PETフィルム、発光層のいずれかを光源装置上に配置して、分光光度計(大塚電子(株)製、商品名「瞬間マルチ測光システム MCPD−3000」)により正面輝度(発光強度の絶対エネルギー:μW/cm2/nm)を測定した。この際、受光部は、色純度向上シート等の上方向(光源装置と反対側)3cmのところに設置した。
反射層の反射スペクトルを分光光度計(大塚電子(株)製、商品名「瞬間マルチ測光システム MCPD−3000」)により測定することで選択反射の中心波長λおよび最大反射率を求め、前記最大反射率の半分の反射率を有する波長帯域幅を選択反射帯域幅(Δλ)とした。
[発光層の作製]
まず、ポリメチルメタクリレート樹脂((株)クラレ製、商品名「パラペットEH−1000P」)をトルエンに溶解し、30重量%のポリマー溶液を作製した。つぎに、前記式(1)の構造を持つ蛍光物質(BASF社製、商品名「Lumogen F Red 305」)をトルエンに溶解し、1重量%の蛍光物質溶液を作製した。前記ポリマー溶液100重量部と前記蛍光物質溶液1.2重量部とをハイブリッドミキサーで混合した後、脱泡処理を行った。得られた混合液をPET基材上にアプリケータを用いてキャスティングして、90℃で20分間乾燥させることで、フィルムを得た。このフィルムを、前記PET基材から剥離することで、本実施例の発光層を得た。この発光層の厚みは、30μmであった。また、この発光層の波長545nmにおける透過率は、91%であった。そして、この発光層の最大吸収波長である577nmにおける透過率は、87.65%であった。さらに、この発光層の後述の反射層の選択反射の中心波長λ(585nm)における透過率は、88.72%であった。
前記式(8)の構造を持つ光重合性ネマチック液晶モノマー(BASF(株)製、商品名「LC242」)100重量部、前記式(33)の構造を持つ重合性カイラル剤(BASF(株)製、商品名「LC756」)4.75重量部、光重合開始剤(チバ・スペシャリティ・ケミカルズ(株)製、商品名「イルガキュア907」)5重量部、溶媒(MEK)385重量部を混合して塗工液を調製した。前記塗工液を、延伸PETフィルム上にワイヤーバーを用いて塗布し、100℃で1分間加熱処理して均一な配向状態を有する塗膜を得た。得られた塗膜に紫外線照射を行い(露光照度:65mW/cm2、総露光時間:10秒間)、配向状態を固定することで、本実施例の反射層を得た。この反射層の選択反射の中心波長λは、585nm、選択反射波長帯域幅Δλは、85nm、前記選択反射の中心波長λ(585nm)での反射率(最大反射率)は、38%であった。
前記発光層の一方の側に前記反応層を重ね合わせることで、前記発光層と前記反射層とを積層し、図1に示す構成の色純度向上シート100を得た。
光源装置上に、発光層11が前記光源装置側に位置するように前記色純度向上シート100を載せて正面輝度の測定を行った。
実施例1で得られた発光層、実施例1で得られた反射層、位相差板、実施例1で得られた反射層をこの順で重ね合わせることで積層し、図3に示す構成の色純度向上シート300を得た。前記位相差板としては、位相差295nmの位相差板(日東電工(株)製、商品名「NRF」)を用いた。本実施例の反射層の選択反射の中心波長λは、585nm、選択反射波長帯域幅Δλは、90nm、前記選択反射の中心波長λ(585nm)での反射率(最大反射率)は、59%であった。
光源装置上に、実施例1で使用した延伸PETフィルムのみを載せて正面輝度を測定した。
光源装置上に、実施例1で得られた発光層のみを載せて正面輝度を測定した。
ポリマー溶液100重量部と蛍光物質溶液5.7重量部とを混合したこと以外は、実施例1と同様にして、本比較例の発光層を得た。この発光層の厚みは、30nmであった。また、この発光層の波長545nmにおける透過率は、59%であった。そして、この発光層の最大吸収波長である577nmにおける透過率は、44.49%であった。さらに、この発光層の波長585nmにおける透過率は、48.11%であった。
増加量(%)={(Iλ−I0λ)/I0λ}×100 ・・・(III)
Iλ:実施例1、2および比較例2、3の典型的な波長における発光強度(μW/cm2/nm)
I0λ:比較例1の典型的な波長における発光強度(μW/cm2/nm)
12、22、23、32、33 反射層
34 位相差板
41 拡散反射板
42 バックライト(光源装置)
43 液晶パネル
100、200、300 色純度向上シート
400 液晶表示装置
Claims (7)
- 目的波長帯域以外の特定波長帯域の光を吸収し波長変換して目的波長帯域の光を発光することにより目的波長帯域の色の純度を向上させる発光手段を含む発光層を有し、
前記発光層の最大吸収波長における透過率が70%以上であり、
さらに、反射層を有し、
バックライト光の入射方向において、前記発光層と前記反射層とがこの順序で積層され、
前記反射層は、前記目的波長帯域以外の特定波長帯域の光であって前記発光層に含まれる発光手段で吸収されずに透過した光の一部を選択的に反射して、再度、前記発光層に入光させ、前記入光した光の一部は、前記発光層を透過し、
前記反射層が選択的に反射する選択反射帯域が、前記発光層の最大吸収波長を含む
ことを特徴とする色純度向上シート。 - 前記発光層が、マトリックスポリマーと蛍光物質とから形成される請求項1記載の色純度向上シート。
- 前記反射層が、液晶モノマーおよびカイラル剤から形成されたコレステリック層である請求項1または2記載の色純度向上シート。
- バックライトおよび色純度向上シートを含む光学装置であって、前記色純度向上シートが、請求項1から3のいずれか一項に記載の色純度向上シートである光学装置。
- 色純度向上シートを含む画像表示装置であって、前記色純度向上シートが、請求項1から3のいずれか一項に記載の色純度向上シートである画像表示装置。
- 色純度向上シートを含む液晶表示装置であって、前記色純度向上シートが、請求項1から3のいずれか一項に記載の色純度向上シートである液晶表示装置。
- 色純度向上シートを含む太陽電池であって、前記色純度向上シートが、請求項1から3のいずれか一項に記載の色純度向上シートである太陽電池。
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JP2014222768A (ja) * | 2014-07-11 | 2014-11-27 | 日東電工株式会社 | 太陽電池モジュール用粘着シートおよび太陽電池モジュール |
KR20190042046A (ko) | 2016-09-09 | 2019-04-23 | 디아이씨 가부시끼가이샤 | 중합성 액정 조성물 및 그것을 이용한 광학 필름 |
WO2024093615A1 (zh) * | 2022-11-01 | 2024-05-10 | 镭昱光电科技(苏州)有限公司 | 一种微显示芯片及其制备方法 |
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EP2695930B1 (en) | 2011-03-30 | 2019-09-11 | DIC Corporation | Polymerizable liquid crystal composition, polarized light-emitting coating material, novel naphtholactam derivative, novel coumarin derivative, novel nile red derivative, and novel anthracene derivative |
JP2015512147A (ja) * | 2012-02-03 | 2015-04-23 | ザ・リージェンツ・オブ・ザ・ユニバーシティ・オブ・カリフォルニアThe Regents of the University of California | 植物成長用のルミネセンス発電ウィンドウ |
US20130215136A1 (en) * | 2012-02-20 | 2013-08-22 | Apple Inc. | Liquid crystal display with large color gamut |
CN102661544B (zh) * | 2012-04-27 | 2015-09-02 | 深圳市华星光电技术有限公司 | 背光模组及液晶显示装置 |
CN105874361B (zh) * | 2013-12-24 | 2018-08-21 | 富士胶片株式会社 | 光学片部件及显示装置 |
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DE4424817A1 (de) * | 1994-07-14 | 1996-01-18 | Basf Ag | Vernetzte Polymerteilchen mit Fluoreszenzfarbstoff |
CN1154005C (zh) * | 1998-04-28 | 2004-06-16 | 时至准钟表股份有限公司 | 反射式彩色液晶显示装置 |
TW200302378A (en) * | 2002-01-23 | 2003-08-01 | Nitto Denko Corp | Optical film, method for manufacturing the same, and phase difference film and polarizing plate using the same |
US7430355B2 (en) * | 2003-12-08 | 2008-09-30 | University Of Cincinnati | Light emissive signage devices based on lightwave coupling |
US8530740B2 (en) * | 2005-02-16 | 2013-09-10 | Koninklijke Philips N.V. | Luminescent object and utilization thereof |
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2006
- 2006-11-24 JP JP2006316591A patent/JP2008129483A/ja active Pending
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2007
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JP2014222768A (ja) * | 2014-07-11 | 2014-11-27 | 日東電工株式会社 | 太陽電池モジュール用粘着シートおよび太陽電池モジュール |
KR20190042046A (ko) | 2016-09-09 | 2019-04-23 | 디아이씨 가부시끼가이샤 | 중합성 액정 조성물 및 그것을 이용한 광학 필름 |
WO2024093615A1 (zh) * | 2022-11-01 | 2024-05-10 | 镭昱光电科技(苏州)有限公司 | 一种微显示芯片及其制备方法 |
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