JP2014064021A - 発光装置、面光源および液晶表示装置 - Google Patents
発光装置、面光源および液晶表示装置 Download PDFInfo
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Abstract
【解決手段】発光装置(10)は、主表面(22)を有する基板(21)と、主表面(22)上に設けられ、1次光を発する半導体発光素子(26)および1次光の一部を吸収して2次光を発する蛍光粒子(36)を内包する内郭部(31)と、屈折率nを有し、内郭部(31)を覆う外郭部(41)とを備える。外郭部(41)は、大気との境界をなす外周面(42)を有する。外周面(42)の少なくとも一部が半径Rの円弧状となって表れる切断面において、内郭部(31)の全てを含み、外周面(42)と同心となる最小の円周が半径rを有する場合に、R>r・nの関係が満たされる。外郭部(41)は、単一の透明ガラス層からなる。内郭部は、蛍光粒子(36)を内包する蛍光体層(31)を有する。蛍光体層(31)は、半導体発光素子(26)を覆うように設けられる。
【選択図】図1
Description
本発明の液晶表示装置は、前述の面光源と、面光源と対向して配置され、背面から面光源によって照射される液晶表示パネルとを備える。
図1は、この発明の実施の形態1における発光装置を示す断面図である。図2は、図1中の発光装置を示す平面図である。図1中には、図2中のI−I線上に沿った断面が示されている。
(R/sinθ)=(r/sinα)
上式を整理すると、
sinα=r・sinθ/R
となり、この式から、θ=π/2のとき、αは最大値(αmax)をとる。
sinα≦sin(αmax)=r/R (式1)
入射角αと、透明樹脂層41および大気層46の境界における全反射の臨界角θcとの間には、スネルの法則から下記の(式2)が成立する。
sinθc=1/n (式2)
今、発光装置10において常にα<θc、すなわち、
αmax<θc (式3)
の関係が成立するならば、発光点Lから発せられた光を全て大気層46に取り出すことができる。
r/R=sin(αmax)<sinθc=1/n
結果、R>r・nの関係が成立するように蛍光体層31および透明樹脂層41を設けることによって、円周101の内側から外側に発せられた光を全て大気層46に取り出すことができる。
本実施の形態では、実施の形態1において説明した図1中の発光装置10の各種変形例について説明を行なう。以下、重複する構造については説明を繰り返さず、発光装置10と比較した場合に異なる構造を中心に説明を行なう。
本実施の形態では、図1中の発光装置10の構造を利用した発光装置と、この発光装置を用いた面照明装置および液晶表示装置とについて説明を行なう。以下、重複する構造については説明を繰り返さず、発光装置10と比較した場合に異なる構造を中心に説明を行なう。
本実施の形態では、図10中の発光装置の構造を利用した発光装置と、この発光装置を用いた面照明装置および液晶表示装置とについて説明を行なう。以下、重複する構造については説明を繰り返さず、図10中の発光装置と比較した場合に異なる構造を中心に説明を行なう。
本実施の形態では、図1中の発光装置10の別の形態について説明を行なう。以下、重複する構造については説明を繰り返さない。
本実施の形態では、図1中の発光装置10の構造を利用した発光装置について説明を行なう。以下、重複する構造については説明を繰り返さず、図1中の発光装置10と比較した場合に異なる構造を中心に説明を行なう。
図23A、図23Bおよび図23Cは、この発明の実施の形態7における発光装置を示す図である。図23Aは平面図であり、図23Bは、図23A中のB−B´線上に沿った断面図であり、図23Cは、図23A中のC−C´線上に沿った断面図である。
本実施の形態における発光装置は、ダムシートが蛍光粒子入りの樹脂を堰き止める作用と、ダムシート自体の反射作用とを兼ね備えるものであって、反射率の高いダムシートを用いるとともに、ダムシートを基板に張り付けたままダムシートの上方にドームが形成されることを特徴とする。それ以外の点は、実施の形態7に説明した発光装置と同等であるので、異なる点について説明する。
本実施の形態における発光装置においては、ダムシート401に替え、ダムリングが用いられる。ダムリングは、ダムシートと同じく、蛍光粒子入りの樹脂が基板の主表面に流出して拡がらないように堰き止めるための部材である。本実施の形態における発光装置は、ダムリングを備える以外は、実施の形態7に説明した発光装置と同等であるため、異なる点について説明する。
本実施の形態では、図25A〜図25C中の発光装置520の構造を利用した発光装置と、この発光装置を用いた面照明装置および液晶表示装置とについて説明を行なう。以下、重複する構造については説明を繰り返さず、図25A〜図25C中の発光装置520と比較した場合に異なる構造を中心に説明を行なう。
Claims (14)
- 主表面を有する基板と、
前記主表面上に設けられ、1次光を発する半導体発光素子および1次光の一部を吸収して2次光を発する蛍光粒子を内包する内郭部と、
屈折率nを有し、前記内郭部を覆う外郭部とを備え、
前記外郭部は、大気との境界をなす外周面を有し、
前記外周面の少なくとも一部が半径Rの円弧状となって表れる切断面において、前記内郭部の全てを含み、前記外周面と同心となる最小の円周が半径rを有する場合に、R>r・nの関係が満たされ、
前記外郭部は、単一の透明ガラス層からなり、
前記内郭部は、前記蛍光粒子を内包する蛍光体層を有し、前記蛍光体層は、前記半導体発光素子を覆うように設けられる、発光装置。 - 前記内郭部は、複数の前記半導体発光素子を内包する、請求項1に記載の発光装置。
- 前記内郭部に分散して設けられ、1次光および2次光を散乱させる散乱粒子をさらに備える、請求項1に記載の発光装置。
- 前記外郭部および前記内郭部は、それぞれ半径Rおよび半径r(r<R/n)を有する同心の半球状に形成される、請求項1に記載の発光装置。
- 前記外郭部および前記内郭部は、前記切断面においてそれぞれ半径Rおよび半径r(r<R/n)を有する同心の半円形状に形成され、
前記外郭部の外周面が、半円柱形状である、請求項1に記載の発光装置。 - 前記外周面および前記円周の中心が前記主表面または前記基板内に配置される、請求項1に記載の発光装置。
- 前記内郭部は、直方体、円柱および多角柱のいずれかの形状を有する、請求項1に記載の発光装置。
- 前記内郭部が屈折率n’を有する場合に、n<n’の関係が満たされる、請求項1に記載の発光装置。
- 前記内郭部は、透明樹脂またはガラスから形成される、請求項1に記載の発光装置。
- 前記主表面上の前記内郭部と前記外郭部との境界部に設けられる堰き止め部材をさらに備える、請求項1に記載の発光装置。
- 直線状に配置された、請求項1に記載の複数の発光装置を有する線光源と、
平面状に延在する出射面と、前記出射面の周縁から板厚方向に延在し、前記線光源から発せられた光が入射される入射端面とを有する導光板とを備え、
前記入射端面への光の入射を受けて、前記出射面から光が出射される、面光源。 - 平面状に配置された、請求項1に記載の複数の発光装置を備える、面光源。
- 請求項11に記載の面光源と、
前記面光源と対向して配置され、背面から前記面光源によって照射される液晶表示パネルとを備える、液晶表示装置。 - 請求項12に記載の面光源と、
前記面光源と対向して配置され、背面から前記面光源によって照射される液晶表示パネルとを備える、液晶表示装置。
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JP5844335B2 (ja) | 2016-01-13 |
WO2009145298A1 (ja) | 2009-12-03 |
CN102047452B (zh) | 2013-03-20 |
JP5512515B2 (ja) | 2014-06-04 |
EP2293354B1 (en) | 2020-05-06 |
CN103199185B (zh) | 2015-07-08 |
US9634203B2 (en) | 2017-04-25 |
CN102047452A (zh) | 2011-05-04 |
CN103199185A (zh) | 2013-07-10 |
BRPI0913195A2 (pt) | 2016-01-12 |
JPWO2009145298A1 (ja) | 2011-10-13 |
EP2293354A4 (en) | 2015-01-14 |
US20110085352A1 (en) | 2011-04-14 |
EP2293354A1 (en) | 2011-03-09 |
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