JP2005005482A - Led light emitting device and color display device using the same - Google Patents

Led light emitting device and color display device using the same Download PDF

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JP2005005482A
JP2005005482A JP2003167208A JP2003167208A JP2005005482A JP 2005005482 A JP2005005482 A JP 2005005482A JP 2003167208 A JP2003167208 A JP 2003167208A JP 2003167208 A JP2003167208 A JP 2003167208A JP 2005005482 A JP2005005482 A JP 2005005482A
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led
emitting device
light
light emitting
led light
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Hirohiko Ishii
廣彦 石井
Koichi Fukazawa
孝一 深澤
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Citizen Electronics Co Ltd
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Citizen Electronics Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/10—Bump connectors; Manufacturing methods related thereto
    • H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
    • H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
    • H01L2224/161—Disposition
    • H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation

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  • Led Device Packages (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Planar Illumination Modules (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of color rendering property since the valley of a spectrum exists in a 500nm wavelength region and the problem that LED where red is corrected becomes red as a white light source in a phosphor mixed color-type white system LED light emitting device using conventional blue LED and a phosphor. <P>SOLUTION: The LED light emitting device is provided with blue LED, a yellow system phosphor covered by blue LED, red LED and third LED having a light emitting wavelength band between a light emitting wavelength band of blue LED and an excited light emitting wavelength band of the yellow system phosphor. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する分野】
本発明はカラー表示を行なう表示装置のバックライトや照明等に用いられるＬＥＤ発光装置及び、前記ＬＥＤ発光装置を照明光源とするカラー表示装置に関するものであり、詳しくは青色ＬＥＤと黄色系蛍光体を用いた白色系ＬＥＤ発光装置及びそれを用いたカラー表示装置の改良に関する。
【０００２】
【従来の技術】
近年、発光ダイオード（以下ＬＥＤという）は半導体素子であるため、長寿命で優れた駆動特性を有し、さらに小型で発光効率が良く、鮮やかな発光色を有することから、カラー表示装置のバックライトや照明等に広く利用されるようになってきた。
【０００３】
特に近年、赤色（Ｒ）緑色（Ｇ）青色（Ｂ）の三原色に、高効率のＬＥＤが開発されたことから、多色混合型のＬＥＤ発光装置が用いられている（例えば特許文献１参照）。この多色混合型のＬＥＤ発光装置は、Ｒ，Ｇ，Ｂの３色のＬＥＤを同時に発光させることによって白色光を発光させ、この白色光光源と表示装置のカラーフイルタとによってカラー表示を行なったり、照明装置として用いるものである。
【０００４】
しかし、この多色混合型のＬＥＤ発光装置は、ＲＧＢの各ＬＥＤがそれぞれ発光しているため、各ＬＥＤに対応する発光波長での色純度が高くなるというメリットがあるが、反面各ＬＥＤが優れた単色性ピーク波長を有するが故に白色光源としては演色性に欠けるというデメリットがある。この演色性とはある物体の見え具合に及ぼす照明光源の影響を示すもので、例えば昼の自然光を基準として、その照明光源の色味の再現性を評価したものである。
【０００５】
この演色性は、ＣＩＥの演色性評価方法では、物体色として複数種類（１５種類）のものを決めておき、この複数種類中の特定の数種類に対する演色性の平均値Ｒａ（昼の自然光をＲａ＝１００）により演色性の評価を行なっている。すなわち、前記多色混合型のＬＥＤ発光装置の場合は、Ｒ、Ｇ、Ｂの各ＬＥＤが優れた単色性ピーク波長を有するが故にＲとＧ、ＧとＢの間にスペクトル強度の弱い谷間が存在する。特にＲとＧとの谷間領域は幅も広くスペクトル強度の落ち込みも大きい。この結果、基準となる昼の自然光のスペクトル特性に対して前記谷間のスペクトル成分が欠落するため、Ｒａが１２程度しか得られず、白色光源としては演色性に欠けることになる。
【０００６】
さらに、前記多色混合型のＬＥＤ発光装置の場合は、同時に発光させるＲ，Ｇ，Ｂ各ＬＥＤの固体間のバラツキが大きいため、白色発光のレベルを調整するために、各ＬＥＤの駆動電流を個々に調整する必要があり、また各ＬＥＤの駆動電流を個々に調整することにより、折角初期調整を行っても温度変化や経時変化等によって調整がずれてしまい、安定して白色発光装置を量産することが困難となる問題もある。
【０００７】
この多色混合型のＬＥＤ発光装置の問題を解決する方式として、特許第２９９８６９６号公報や特開平１１−８７７８４号公報に開示されている蛍光体混色型のＬＥＤ発光装置があり、以下この蛍光体混色型の白色系ＬＥＤ発光装置に付いて説明する。
【０００８】
図１４は前記従来例に開示されている蛍光体混色型の白色系ＬＥＤ発光装置の断面図であり、本発明においても構成の一部として用いられるものである。図１４において４０は白色系ＬＥＤ発光装置であり、外部接続用の電極４１，４２を有する基板４３に、青色ＬＥＤ１がフェースダウンボンディングされており、該青色ＬＥＤ１をＹＡＧ系の蛍光粒子４を混入した透明樹脂５でモールドしている。そして後述するごとく前記白色系ＬＥＤ発光装置４０からは白色系光Ｐｗが発光される。
【０００９】
図１５は前記白色系ＬＥＤ発光装置４０の拡大部分断面図であり、図１５により前記白色系ＬＥＤ発光装置４０の動作を説明する。図１５において電極４１，４２に駆動電圧を印加すると青色ＬＥＤ１が青色光Ｐｂを発光する。そしてこの青色光Ｐｂが透明樹脂５に混入された蛍光粒子４に衝突すると前記蛍光粒子４が励起されて波長変換が行なわれ、蛍光粒子４から図示のごとく黄色光Ｐｙが発光される。この結果、前記白色系ＬＥＤ発光装置４０からは、前記青色ＬＥＤ１から発光せれて前記蛍光粒子４に衝突せずに出力される青色光Ｐｂと、前記蛍光粒子４に衝突して波長変換された黄色光Ｐｙとが混合されて前記図１４に示すごとく白色系光Ｐｗ出力される。
【００１０】
図１６はＹＡＧ系の蛍光粒子４を使用した前記白色系ＬＥＤ発光装置４０の発光波長特性図であり、発光波長曲線Ｈ１は青色光Ｐｂ成分である４５０ｎｍ付近に大きなピークＫｂと、黄色光Ｐｙ成分である５５０ｎｍ付近にピークＫｙがあり、さらに可視光領域のかなりの部分に発光成分が存在するため、かなり演色性が改善されている。
【００１１】
しかし、前記従来の青色ＬＥＤとＹＡＧ系の蛍光体による白色系ＬＥＤ発光装置には下記の問題が存在する。これは図１６に示すごとく赤色光Ｐｒ成分である６５０ｎｍ付近には殆んど発光成分が存在しないことである。すなわち前記ＹＡＧ系蛍光体による白色系ＬＥＤ発光装置は白色光源ではあるが、波長成分を見ると赤色成分を殆んど含まないため青色がかった冷たい白色光源となっている。そして基準となる自然光に対して赤色領域における再現性が大幅に欠ける結果となる。
【００１２】
上記従来の蛍光体混色型の白色系ＬＥＤ発光装置の問題点を解決する方式として、特開２００２−５７３７６号公報に赤色補正方式の蛍光体混色型白色系ＬＥＤ発光装置が開示されており、以下この赤色補正方式の蛍光体混色型白色系ＬＥＤ発光装置に付いて説明する。
【００１３】
図１７は従来の蛍光体混色型の白色系ＬＥＤ発光装置に、赤色ＬＥＤを同時発光させた、赤色補正方式の蛍光体混色型白色系ＬＥＤ発光装置における発光波長特性図であり、発光波長曲線Ｈ２は青色光Ｐｂ成分である４５０ｎｍ付近に大きなピークＫｂと、黄色光Ｐｙ成分である５５０ｎｍ付近にピークＫｙがあり、さらに赤色光Ｐｒ成分である６５０ｎｍ付近には前記赤色ＬＥＤの発光による大きなピークＫｒが存在する。
【００１４】
すなわち、前記赤色補正方式の蛍光体混色型白色系ＬＥＤ発光装置においては、可視光領域においてスペクトルの落ち込みが少なくなって、演色性が改善され、特に赤色領域におけるスペクトル強度は格段に補強されている。
【００１５】
【発明が解決しようとする課題】
前記赤色補正方式の蛍光体混色型白色系ＬＥＤ発光装置においては、前記多色混合型の白色系ＬＥＤ発光装置や、蛍光体混色型の白色系ＬＥＤ発光装置に比べると、その演色性はかなり改善されている。しかし、フルカラー表示装置のバックライトに用いる白色光源としては不十分であり、特に図１７に示すごとく緑色領域の５００ｎｍ付近の発光成分が不足している。
【００１６】
また、蛍光灯に代わる照明光として使用した場合には、赤色が目立つ不自然な照明となり、蛍光灯のような自然な照明光として代替することが出来ないという問題がある。
【００１７】
本発明は上記問題点を解決しようとするものであり、カラー表示装置のバックライトや、自然な照明光として蛍光灯に代替することが可能な白色系ＬＥＤ発光装置及びそれを光源として用いたカラー表示装置を提供することである。
【００１８】
【課題を解決するための手段】
上記目的を達成するため本発明においては、ＬＥＤを発光源とし、表示装置のバックライトや照明等を行なう発光装置において、前記発光源は第１のＬＥＤである青色ＬＥＤと、該青色ＬＥＤに被覆された黄色系蛍光体と、第２のＬＥＤである赤色ＬＥＤと、前記青色ＬＥＤの発光波長帯域と前記黄色系蛍光体の励起発光波長帯域との間の発光波長帯域を有する第３のＬＥＤとにより構成されることを特徴とする。
【００１９】
前記第３のＬＥＤは短波長帯域の緑色ＬＥＤであり、その発光波長帯域は４９０〜５２０ｎｍであることを特徴とする。
【００２０】
前記第３のＬＥＤは前記第１のＬＥＤよりも長波長帯域の青色ＬＥＤであり、その発光波長帯域は４７０〜４９０ｎｍであることを特徴とする。
【００２１】
前記黄色系蛍光体はＹＡＧ系蛍光体であることであることを特徴とする。
【００２２】
前記黄色系蛍光体はデルビウム系蛍光体であることであることを特徴とする。
【００２３】
前記黄色系蛍光体はストロンチウム系蛍光体であることであることを特徴とする。
【００２４】
前記黄色系蛍光体はリン酸塩系、ケイ酸塩系、アルミン酸塩系、の何れか１つの蛍光体であることを特徴とする。
【００２５】
前記第１〜第３のＬＥＤが１つの基板上に実装され、黄色系蛍光粒子を含む透明樹脂にて封止されていることを特徴とする。
【００２６】
第１のＬＥＤである青色ＬＥＤと、該青色ＬＥＤに被覆された黄色系蛍光体と、第２のＬＥＤである赤色ＬＥＤと、前記青色ＬＥＤの発光波長帯域と前記黄色系蛍光体の励起発光波長帯域との間の発光波長帯域を有する第３のＬＥＤとにより構成されたＬＥＤ発光装置と、該ＬＥＤ発光装置を照明光源する表示装置とにより構成されたことを特徴とするカラー表示装置。
【００２７】
【発明の実施の形態】
以下図面により、本発明の実施の形態を説明する。図１は本発明の第１の実施の形態を示すＬＥＤ発光装置の平面図、図２及び図３はそれぞれ図１に示すＬＥＤ発光装置のＡ−Ａ断面図及びＢ−Ｂ断面図であり、図１４及び図１５と同一要素には同一番号を付し、説明を省略する。
【００２８】
図１〜図３において１０は色補正されたＬＥＤ発光装置であり、接続電極１１，１２，１３等を有する１枚の基板１４上に第１のＬＥＤである青色ＬＥＤ１と、第２のＬＥＤである赤色ＬＥＤ２と、第３のＬＥＤ３とが略三角配置に並べて実装されている。尚、本実施の形態においては前記第３のＬＥＤ３として短波長の緑色ＬＥＤ３ａを用いている。そして前記青色ＬＥＤ１と緑色ＬＥＤ３ａとは蛍光粒子４を混入した透明樹脂５で被覆されることにより、白色系ＬＥＤ部１０ａと谷間領域補正ＬＥＤ部１０ｃを構成し、さらに赤色ＬＥＤ２は透明樹脂５で被覆されることにより赤色補正ＬＥＤ部１０ｂを構成している。
【００２９】
上記構成を有するＬＥＤ発光装置１０は、前記白色系ＬＥＤ部１０ａが前記図１５に示す白色系ＬＥＤ発光装置４０と同じ動作によって白色系光Ｐｗを発光し、前記赤色補正ＬＥＤ部１０ｂが赤色光Ｐｒを発光し、さらに前記谷間領域補正ＬＥＤ部１０ｃが前記青色ＬＥＤ１の発光波長帯域と前記黄色系蛍光体である蛍光粒子４の励起発光波長帯域との間の発光波長帯の緑色光Ｐｇを発光する。この結果前記ＬＥＤ発光装置１０からは白色系光Ｐｗと赤色光Ｐｒと緑色光Ｐｇとが混色されることにより、色補正されて演色性の優れた白色光Ｐｗｈが発光される。
尚、前記ＬＥＤ発光装置１０は１枚の基板１４に実装されているが、全体を反射部を有する１つのケース内に収納することが望ましい。
【００３０】
次に図４及び図５により前記ＬＥＤ発光装置１０の発光波長特性を説明する。図４は前記白色系ＬＥＤ部１０ａ、赤色補正ＬＥＤ部１０ｂ、谷間領域補正ＬＥＤ部１０ｃの各発光波長を示す発光波長特性図であり、図５は図４に示す３つの発光波長を合成した発光波長特性図である。
【００３１】
図４において、白色系光Ｐｗは前記図１６に示す発光波長曲線Ｈ１と同じものであり、前記青色ＬＥＤ１の青色光Ｐｂ成分である４５０ｎｍ付近の大きなピークＫｂと、前記蛍光粒子４の励起による黄色光Ｐｙ成分である５５０ｎｍ付近にピークＫｙを有する。また赤色光Ｐｒは前記赤色ＬＥＤ２による赤色光Ｐｒ成分である６５０ｎｍ付近に大きなピークＫｒを有し、さらに緑色光Ｐｇは前記緑色ＬＥＤ３ａによる緑色光Ｐｇ成分である５００ｎｍ付近に大きなピークＫｇを有する。
【００３２】
上記図４における３つの発光波長成分を合成したのが図５に示す発光波長曲線Ｈ１０であり、前記、図１７に示す従来の赤色補正方式の蛍光体混色型白色系ＬＥＤによる発光波長曲線Ｈ２に比べて、５００ｎｍ付近の谷間領域の落ち込みが大きく改善されていることが解る。
なお、前記谷間領域補正のための前記緑色ＬＥＤ３ａとしては、比較的短波長の緑色ＬＥＤを使用することが望ましく、その波長範囲としては４９０ｎｍ〜５２０ｎｍの緑色ＬＥＤを使用することによって５００ｎｍ付近の谷間領域の補正をする事が出来た。
【００３３】
また本発明における黄色系蛍光体としては，ＹＡＧ系の蛍光体を用いており、特にデルビウム系、ストロンチウム系、リン酸塩系、ケイ酸塩系、アルミン酸塩系、等の蛍光体を用いることにより、良好な黄色発光を得ることが出来た。上記構成により図５に示すごとく、谷間領域補正ＬＥＤとして短波長帯域の緑色ＬＥＤを用いた第１の実施の形態においては、５００ｎｍ帯域のスペクトルの谷間を補完して白色光源としての演色性を高める効果が極めて大きい。
【００３４】
図６は前記ＬＥＤ発光装置１０の駆動回路を示す回路ブロック図であり、ＬＥＤ発光装置１０は前記青色ＬＥＤ１、赤色ＬＥＤ２、緑色ＬＥＤ３ａと、それぞれの接続電極１１，１２，１３を回路記号で現したものである。２０は駆動回路であり電流調整装置１５と動作制御装置１６と前記３つのＬＥＤに電流を供給するための電源装置１７により構成されている。そして前記電流調整装置１５は３つの可変抵抗１５ａ，１５ｂ、１５ｃを有し、また動作制御装置１６は３つのスイッチ１６ａ、１６ｂ、１６ｃを有する。
【００３５】
上記駆動回路２０の構成は、前記ＬＥＤ発光装置１０の３つのＬＥＤと前記電流調整装置１５の３つの可変抵抗と、前記動作制御装置１６の３つのスイッチとが各々直列接続されて前記電源装置１７に接続されている。すなわち、前記ＬＥＤ発光装置１０の青色ＬＥＤ１は接続電極１１を介して可変抵抗１５ａ、スイッチ１６ａ、電源装置１７に直列接続されており、同様に前記赤色ＬＥＤ２は接続電極１２を介して可変抵抗１５ｂ、スイッチ１６ｂ、電源装置１７に直列接続され、さらに前記緑色ＬＥＤ３ａは接続電極１３を介して可変抵抗１５ｃ、スイッチ１６ｃ、電源装置１７に直列接続されている。
【００３６】
次に上記駆動回路２０の動作を説明する。前記電流調整装置１５及び動作制御装置１６は、それぞれ前記ＬＥＤ発光装置１０の３つのＬＥＤに対して独立に制御可能な可変抵抗及びスイッチを有するため、各ＬＥＤは独立に点燈制御を行なうことが出来る。すなわち、青色ＬＥＤ１はスイッチ１６ａによって点燈、消灯を制御することが出来、そして点燈状態において可変抵抗１５ａを調整することで明るさを調整することが出来る。また、赤色ＬＥＤ２はスイッチ１６ｂと可変抵抗１５ｂ、緑色ＬＥＤ３ａはスイッチ１６ｃと可変抵抗１５ｃにより同様に制御可能である。
【００３７】
上記のごとく前記ＬＥＤ発光装置１０は３つのＬＥＤを独立に制御することが出来るため、各ＬＥＤの単独発光、２つのＬＥＤの組合せ発光、３つのＬＥＤの組合せ発光が可能であり、合計７通りの発光を得ることが出来る。例えば各ＬＥＤの単独発光の場合は図４に示す白色系光Ｐｗ、赤色光Ｐｒ、緑色光Ｐｇが発光され、また青色ＬＥＤ１と赤色ＬＥＤ２との組合せ発光の場合は図１７に示す発光波長曲線Ｈ２が発光され、さらに青色ＬＥＤ１、赤色ＬＥＤ２、緑色ＬＥＤ３ａの同時発光の場合は図５に示す発光波長曲線Ｈ１０が発光される。
【００３８】
従って、前記駆動回路２０を用いて白色光Ｐｗｈの調整を行う方法は、動作制御回路１６のスイッチ１６ａ〜１６ｃを全てＮＯにして、前記青色ＬＥＤ１、赤色ＬＥＤ２、緑色ＬＥＤ３ａを全て点灯させた状態において、前記電流調整回路１５の可変抵抗１５ａ〜１５ｃを各々調整することにより合成発光の発光波長曲線Ｈ１０を最適状態に調整する。
【００３９】
図７は駆動回路の他の実施の形態を示す回路ブロック図であり、本実施の形態における駆動回路２１で、前記駆動回路２０と異なるところは前記動作制御装置１６に対して、３つのスイッチ１８ａ〜１８ｃが追加された動作制御装置１８を有することである。
【００４０】
前記スイッチ１８ａは前記電流調整装置１５における可変抵抗１５ａの青色ＬＥＤ１側、すなわち青色ＬＥＤ１の接続電極１１側から直接引き出されている。従って青色ＬＥＤ１の点燈制御は前記スイッチ１６ａをＯＮした場合には可変抵抗１５ａを介して調整された発光となり、またスイッチ１８ａをＯＮした場合には可変抵抗１５ａを介さずに直接発光するため、より明るい発光となる。以上の制御動作はスイッチ１８ｂ，１８ｃにより、赤色ＬＥＤ２、緑色ＬＥＤ３ａについても同様に行なわれる。
【００４１】
上記駆動回路２１によれば、スイッチ１６ａ〜１６ｃとスイッチ１８ａ〜１８ｃを適宜使用することにより、調整発光と直接発光とを使い分けることが可能となる。すなわち、合成発光においては可変抵抗を用いて調整された白色発光を行なわせることが出来、また単独発光においては可変抵抗を用いずに、より明るい発光を行なわせることが出来る。
【００４２】
さらに、前記駆動回路２１の使い方としては、合成発光の場合でも少し演色性を落としても明るい白色発光をさせたい場合にはスイッチ１８ａ〜１８ｃを用いて合成発光を行わせることができるし、また、単独発光の場合でもスイッチ１６ａ〜１６ｃを用いて調整発光を行わせる事により、少し発光の明るさは落ちるが、消エネルギー点灯が出来る。
【００４３】
図８、は本発明における第２の実施の形態を示すＬＥＤ発光装置３０の平面図であり、前記図１に示すＬＥＤ発光装置１０と同一要素には同一番号を付し、説明を省略する、前記ＬＥＤ発光装置３０は基本構成は第１の実施の形態におけるＬＥＤ発光装置１０と同じであるが、異なるところは第３のＬＥＤ３として緑色ＬＥＤ３ａに代えて、前記青色ＬＥＤ１よりも長波長帯域の青色ＬＥＤ３ｂを用いたことであり、谷間領域補正ＬＥＤ部３０ｃより、青色ＬＥＤ３ｂによる長波長青色光ＰｂＬが発光される。
【００４４】
図９は前記白色系ＬＥＤ部１０ａ、赤色補正ＬＥＤ部１０ｂ、谷間領域補正ＬＥＤ部３０ｃの各発光波長を示す発光波長特性図であり、図１０は図９に示す３つの発光波長を合成した発光波長特性図である。
【００４５】
図９において、白色系光Ｐｗと赤色光Ｐｒは図４に示す前記ＬＥＤ発光装置１０の波長特性と同じであるが、長波長青色光ＰｂＬは前記青色ＬＥＤ３ｂによる長波長青色光ＰｂＬ成分である４８０ｎｍ付近に大きなピークＫｂＬを有する。上記図９における３つの発光波長成分を合成したのが図１０に示す発光波長曲線Ｈ３０であり、前記ＬＥＤ発光装置１０の発光波長曲線Ｈ１０と同様に、前記図１７に示す従来の赤色補正方式の蛍光体混色型白色系ＬＥＤによる発光波長曲線Ｈ２に比べて、５００ｎｍ付近の谷間領域の落ち込みが大きく改善されていることがわかる。
【００４６】
なお、前記谷間領域補正のための前記青色ＬＥＤ３ｂとしては、比較的長波長の青色ＬＥＤを使用することが望ましく、その波長範囲としては４７０ｎｍ〜４９０ｎｍの長波長青色ＬＥＤを使用することによって５００ｎｍ付近の谷間領域の補正をする事が出来た。
上記構成により図１０に示すごとく、谷間領域補正ＬＥＤとして長波長帯域の青色ＬＥＤを用いた第２の実施の形態においては、５００ｎｍ帯域のスペクトルの谷間を補完して白色光源としての演色性を高めると同時に、演色性を高めるために加えた赤色ＬＥＤによる白色光源としての赤みを緩和する効果を有する。これは長波長帯域の青色ＬＥＤが前記赤色ＬＥＤに対して補色の関係にある発光を行うことによるものである。
【００４７】
図１１及び図１２は本発明におけるＬＥＤ発光装置の他の実施の形態を示す平面図であり、図１１に示すＬＥＤ発光装置２５は前記基板１４上に実装された青色ＬＥＤ１、赤色ＬＥＤ２、第３のＬＥＤ３の全てを蛍光粒子４を混入した透明樹脂５で被覆ものである。また図１２に示すＬＥＤ発光装置２６は前記基板１４上に実装する各ＬＥＤの配置をかえて、赤色ＬＥＤ２と第３のＬＥＤ３を横に並べ、青色ＬＥＤ１を独立させることにより、青色ＬＥＤ１のみを蛍光粒子４を混入した透明樹脂５で被覆し、赤色ＬＥＤ２、第３のＬＥＤ３とを透明樹脂５で被覆している。
【００４８】
ここで、図１、図１１、図１２に示すＬＥＤ発光装置１０、ＬＥＤ発光装置２５、ＬＥＤ発光装置２６の発光特性を比較する。まず基本的に蛍光粒子４の性質としては、波長の短い光が衝突した場合は励起されて黄色光Ｐｙを発光するが、波長の長い光が衝突した場合には励起されず黄色光Ｐｙは発光されない。従って、波長の短い青色光Ｐｂが衝突した場合は多くの励起が起こって強い黄色光Ｐｙは発光され、波長のやや短い第３のＬＥＤの発光、すなわち短波長の緑色光Ｐｇや、長波長の青色光ＰｂＬが衝突した場合は少し励起が起こって少ない黄色光Ｐｙ発光され、さらに波長の長い赤色光Ｐｒが衝突した場合は励起が起こらず、黄色光Ｐｙは発光されない。
【００４９】
上記の原理に基づいて考えると、図１２に示すＬＥＤ発光装置２６は青色ＬＥＤ１のみが蛍光粒子４を混入した透明樹脂５で被覆され、赤色ＬＥＤ２と第３のＬＥＤ３とは透明樹脂５で被覆されているため、青色光Ｐｂによる励起のみが起こり、赤色光Ｐｒと緑色光Ｐｇや青色光ＰｂＬは蛍光粒子４との衝突が無いため、図４や図９に示す通りの発光特性が得られる。
【００５０】
また、図１に示すＬＥＤ発光装置１０は青色ＬＥＤ１と第３のＬＥＤ３とが蛍光粒子４を混入した透明樹脂５で被覆され、赤色ＬＥＤ２のみが透明樹脂５で被覆されているため、青色光Ｐｂによる励起と緑色光Ｐｇまたは青色光ＰｂＬによる励起が起こり、赤色光Ｐｒは蛍光粒子４との衝突が起きない。この結果、青色光Ｐｂと赤色光Ｐｒについては前記ＬＥＤ発光装置２６と同じだが、緑色光Ｐｇまたは青色光ＰｂＬが蛍光粒子４と衝突することによって、少し黄色光Ｐｙが発光されるとともに前記緑色光Ｐｇまたは青色光ＰｂＬが蛍光粒子４と衝突したことにより少し減衰する。従って、ＬＥＤ発光装置１０はＬＥＤ発光装置２６に比べて若干、黄色光Ｐｙ成分が増加するが前記緑色光Ｐｇ成分または青色光ＰｂＬ成分が減少する。
【００５１】
さらに、図１１に示すＬＥＤ発光装置２５は青色ＬＥＤ１と赤色ＬＥＤ２と第３のＬＥＤ３とが全て蛍光粒子４を混入した透明樹脂５で被覆されているため、青色ＬＥＤ１と第３のＬＥＤ３とは前記図１に示すＬＥＤ発光装置１０と同じだが、赤色光Ｐｒが蛍光粒子４と衝突したことにより少し減衰する。従って、ＬＥＤ発光装置２５はＬＥＤ発光装置２６に比べて若干、黄色光Ｐｙ成分が増加するが前記赤色光Ｐｒ成分と前記緑色光Ｐｇ成分または青色光ＰｂＬ成分が減少する。
【００５２】
上記のごとく３つのＬＥＤ発光装置の関係は、ＬＥＤ発光装置２６が基本形となり、ＬＥＤ発光装置１０は前記第３のＬＥＤ３の発光成分が少し減衰するが、黄色光Ｐｙ成分が増加するというメリットがあり、さらに、ＬＥＤ発光装置２５は赤色ＬＥＤ２の発光成分と第３のＬＥＤ３の発光成分が少し減衰するが、黄色光Ｐｙ成分が増加することと、モールド工程が１回で済むため、製造コストが安くなるというメリットがある。
【００５３】
図１３は本発明の前記ＬＥＤ発光装置を照明光源として用いたカラー表示装置の斜視図である。図１３において６０はカラーフィルタを備えた液晶等の表示装置、７０は前記表示装置６０の下面側に配設された導光体であり、該導光体７０の側面には前記ＬＥＤ発光装置１０が配設されている。そして該ＬＥＤ発光装置１０は前記駆動回路２０によって発光制御されることにより、前記表示装置６０に色補正された好適な白色発光Ｐｗｈや、明るい白色発光Ｐｗや、さらに各ＬＥＤごとの単色発光を供給することが出来る。
【００５４】
【発明の効果】
上記のごとく本発明では、赤色補正方式の蛍光体混色型白色発光装置に、青色ＬＥＤの発光波長帯域と黄色系蛍光体の励起発光波長帯域との間の発光波長帯域を有する第３のＬＥＤを発光させることによって、波長の谷間となる５００ｎｍ付近の発光成分を補正する事が可能となり、演色性に優れた白色光源を提供することが出来た。
【００５５】
すなわち本発明のＬＥＤ発光装置では特に緑色に対する演色性を大きく改善できるとともに、前記第３のＬＥＤの発光による蛍光粒子の励起も行なわれることで、照明光としての明るさを増すことができた。
また、各ＬＥＤに対する独立制御可能な駆動回路を設けることによって演色性の高い白色発光を含む、各種の発光を供給可能なＬＥＤ発光装置とそのＬＥＤ発光装置をバックライトとするフルカラー表示装置を提供することができた。
【００５６】
さらに、本発明におけるＬＥＤ発光装置において、谷間領域補正ＬＥＤとして短波長帯域の緑色ＬＥＤを用いた第１の実施の形態においては、特に波長５００ｎｍ帯域のスペクトルの谷間を補完して白色光源としての演色性を高める効果が大きいのに対し、谷間領域補正ＬＥＤとして長波長帯域の青色ＬＥＤを用いた第２の実施の形態においては、演色性を高めるために加えた赤色ＬＥＤによる白色光源としての赤みを緩和する効果が大きい。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態を示すＬＥＤ発光装置の平面図。
【図２】図１に示すＬＥＤ発光装置のＡ−Ａ断面図。
【図３】図１に示すＬＥＤ発光装置のＢ−Ｂ断面図。
【図４】本発明の第１の実施の形態を示すＬＥＤ発光装置の各ＬＥＤの発光波長特性図。
【図５】本発明の第１の実施の形態を示すＬＥＤ発光装置の発光波長特性図。
【図６】本発明におけるＬＥＤ発光装置の駆動回路の回路ブロック図。
【図７】本発明における駆動回路の他の実施の形態を示す回路ブロック図。
【図８】本発明の第２の実施の形態を示すＬＥＤ発光装置の平面図。
【図９】本発明の第２の実施の形態を示すＬＥＤ発光装置の各ＬＥＤの発光波長特性図。
【図１０】本発明の第２の実施の形態を示すＬＥＤ発光装置の発光波長特性図。
【図１１】本発明の他の実施の形態を示すＬＥＤ発光装置の平面図。
【図１２】本発明の他の実施の形態を示すＬＥＤ発光装置の平面図。
【図１３】本発明のＬＥＤ発光装置を光源としたカラー表示装置の斜視図。
【図１４】従来の蛍光体混色型の白色系ＬＥＤ発光装置の断面図。
【図１５】図１４に示す従来の蛍光体混色型の白色系ＬＥＤ発光装置の拡大部分断面図。
【図１６】従来の蛍光体混色型の白色系ＬＥＤ発光装置の発光波長特性図。
【図１７】従来の赤色補正方式の白色系ＬＥＤ発光装置の発光波長特性図。
【符号の説明】
１ 青色ＬＥＤ
２ 赤色ＬＥＤ
３ 第３のＬＥＤ
３ａ 短波長帯域の緑色ＬＥＤ
３ｂ 長波長帯域の青色ＬＥＤ
４ 蛍光粒子
１０，２５，２６，３０ ＬＥＤ発光装置
１５ 電流制御装置
１６、１８ 動作制御装置
２０、 駆動回路
６０ 表示装置
７０ 導光体[0001]
[Field of the Invention]
The present invention relates to an LED light emitting device used for backlight or illumination of a display device for performing color display, and a color display device using the LED light emitting device as an illumination light source. Specifically, a blue LED and a yellow phosphor are used. The present invention relates to an improvement of a white LED light emitting device used and a color display device using the same.
[0002]
[Prior art]
In recent years, since a light emitting diode (hereinafter referred to as LED) is a semiconductor element, it has a long life and excellent driving characteristics, is small in size, has high luminous efficiency, and has a bright emission color. It has come to be widely used for lighting and lighting.
[0003]
In particular, since a highly efficient LED has been developed for the three primary colors of red (R), green (G), and blue (B) in recent years, a multi-color mixed type LED light emitting device is used (see, for example, Patent Document 1). . This multi-color mixed type LED light emitting device emits white light by simultaneously emitting LEDs of three colors of R, G, and B, and performs color display by the white light source and the color filter of the display device. It is used as a lighting device.
[0004]
However, this multi-color mixed type LED light emitting device has the merit that the color purity at the emission wavelength corresponding to each LED becomes high because each LED of RGB emits light individually, but each LED is excellent. In addition, since it has a monochromatic peak wavelength, it has a demerit that it lacks color rendering properties as a white light source. This color rendering property indicates the influence of an illumination light source on the appearance of a certain object. For example, the color reproducibility of the illumination light source is evaluated on the basis of natural light at noon.
[0005]
In the CIE color rendering property evaluation method, a plurality of types (15 types) of object colors are determined, and an average value Ra of the color rendering properties with respect to a specific number of the plurality of types (the daylight natural light Ra is determined). = 100), the color rendering properties are evaluated. That is, in the case of the multi-color mixed type LED light emitting device, the R, G, B LEDs have excellent monochromatic peak wavelengths, so that there is a valley having a weak spectrum intensity between R and G, G and B. Exists. In particular, the valley region between R and G is wide and has a large drop in spectral intensity. As a result, since the spectral component of the valley is missing with respect to the spectral characteristics of natural light in the daytime as a reference, only about 12 Ra is obtained, and the color rendering property is lacking as a white light source.
[0006]
Furthermore, in the case of the multi-color mixed type LED light emitting device, since there is a large variation among solids of the R, G, and B LEDs that emit light simultaneously, in order to adjust the level of white light emission, the drive current of each LED is adjusted. It is necessary to adjust each LED individually, and by adjusting the drive current of each LED individually, even if initial adjustment is performed, the adjustment is shifted due to temperature change or change over time, and stable production of white light emitting devices is possible. There are also problems that are difficult to do.
[0007]
As a method for solving the problems of the multicolor mixed type LED light emitting device, there is a phosphor mixed color type LED light emitting device disclosed in Japanese Patent No. 2998696 and Japanese Patent Laid-Open No. 11-87784. The mixed color type white LED light emitting device will be described.
[0008]
FIG. 14 is a cross-sectional view of a phosphor-mixed white LED light-emitting device disclosed in the conventional example, and is used as part of the configuration in the present invention. In FIG. 14, reference numeral 40 denotes a white LED light emitting device. A blue LED 1 is face-down bonded to a substrate 43 having external connection electrodes 41 and 42, and YAG fluorescent particles 4 are mixed into the blue LED 1. Molded with transparent resin 5. As described later, white light Pw is emitted from the white LED light emitting device 40.
[0009]
FIG. 15 is an enlarged partial cross-sectional view of the white LED light emitting device 40, and the operation of the white LED light emitting device 40 will be described with reference to FIG. In FIG. 15, when a drive voltage is applied to the electrodes 41 and 42, the blue LED 1 emits blue light Pb. When the blue light Pb collides with the fluorescent particles 4 mixed in the transparent resin 5, the fluorescent particles 4 are excited to perform wavelength conversion, and yellow light Py is emitted from the fluorescent particles 4 as shown in the figure. As a result, blue light Pb emitted from the blue LED 1 and output without colliding with the fluorescent particles 4 is emitted from the white LED light emitting device 40, and yellow is wavelength-converted by colliding with the fluorescent particles 4. The light Py is mixed and output as white light Pw as shown in FIG.
[0010]
FIG. 16 is a light emission wavelength characteristic diagram of the white LED light emitting device 40 using YAG-based fluorescent particles 4, and the light emission wavelength curve H1 has a large peak Kb around 450 nm which is a blue light Pb component and a yellow light Py component. There is a peak Ky in the vicinity of 550 nm, and since a luminescent component is present in a considerable part of the visible light region, the color rendering is considerably improved.
[0011]
However, the white LED light emitting device using the conventional blue LED and the YAG phosphor has the following problems. As shown in FIG. 16, there is almost no light emission component in the vicinity of 650 nm which is the red light Pr component. That is, although the white LED light emitting device using the YAG phosphor is a white light source, it is a cold blue white light source because it hardly contains a red component when the wavelength component is viewed. As a result, the reproducibility in the red region with respect to natural light serving as a reference is greatly lost.
[0012]
JP-A-2002-57376 discloses a red color-corrected phosphor-mixed white LED light emitting device as a method for solving the problems of the conventional phosphor-mixed white LED light emitting device. This red correction type phosphor mixed color white LED light emitting device will be described.
[0013]
FIG. 17 is a light emission wavelength characteristic diagram of a red color correcting phosphor-mixed white LED light-emitting device in which a red LED is simultaneously emitted from a conventional phosphor-mixed white LED light-emitting device, and a light emission wavelength curve H 2. Has a large peak Kb near 450 nm which is the blue light Pb component, a peak Ky near 550 nm which is the yellow light Py component, and a large peak Kr due to the emission of the red LED near 650 nm which is the red light Pr component. Exists.
[0014]
That is, in the red color correction type phosphor-mixed white LED light emitting device, the drop in the spectrum is reduced in the visible light region, the color rendering is improved, and the spectral intensity in the red region is particularly reinforced. .
[0015]
[Problems to be solved by the invention]
In the red color correction type phosphor-based white LED light emitting device, the color rendering is considerably improved as compared with the multi-color mixed type white LED light emitting device and the phosphor mixed color white LED light emitting device. Has been. However, it is insufficient as a white light source used for a backlight of a full-color display device, and in particular, as shown in FIG.
[0016]
Further, when used as illumination light in place of a fluorescent lamp, there is a problem that red becomes unnatural illumination that stands out and cannot be replaced with natural illumination light such as a fluorescent lamp.
[0017]
SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems. A white LED light-emitting device that can be replaced with a fluorescent lamp as a backlight of a color display device or natural illumination light, and a color using the same as a light source It is to provide a display device.
[0018]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, in a light emitting device that uses an LED as a light source and performs backlighting, illumination, and the like of a display device, the light source is a blue LED that is a first LED, and the blue LED is covered. A yellow LED, a second LED, a red LED, a third LED having an emission wavelength band between the emission wavelength band of the blue LED and the excitation emission wavelength band of the yellow phosphor, It is characterized by comprising.
[0019]
The third LED is a green LED having a short wavelength band, and its emission wavelength band is 490 to 520 nm.
[0020]
The third LED is a blue LED having a longer wavelength band than the first LED, and the emission wavelength band is 470 to 490 nm.
[0021]
The yellow phosphor is a YAG phosphor.
[0022]
The yellow phosphor is a delbium-based phosphor.
[0023]
The yellow phosphor is a strontium phosphor.
[0024]
The yellow phosphor may be any one of phosphate, silicate, and aluminate.
[0025]
The first to third LEDs are mounted on one substrate and sealed with a transparent resin containing yellow fluorescent particles.
[0026]
The blue LED as the first LED, the yellow phosphor coated on the blue LED, the red LED as the second LED, the emission wavelength band of the blue LED and the excitation emission wavelength of the yellow phosphor A color display device comprising: an LED light-emitting device including a third LED having a light emission wavelength band between the band and a display device that illuminates the LED light-emitting device.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an LED light-emitting device showing a first embodiment of the present invention, FIG. 2 and FIG. 3 are AA cross-sectional views and BB cross-sectional views of the LED light-emitting devices shown in FIG. The same elements as those in FIGS. 14 and 15 are denoted by the same reference numerals, and description thereof is omitted.
[0028]
In FIG. 1 to FIG. 3, reference numeral 10 denotes a color-corrected LED light emitting device, which includes a blue LED 1 as a first LED and a second LED on a single substrate 14 having connection electrodes 11, 12, 13 and the like. A certain red LED 2 and a third LED 3 are mounted side by side in a substantially triangular arrangement. In the present embodiment, a short wavelength green LED 3 a is used as the third LED 3. The blue LED 1 and the green LED 3a are covered with a transparent resin 5 mixed with fluorescent particles 4, thereby forming a white LED portion 10a and a valley region correcting LED portion 10c, and the red LED 2 is covered with a transparent resin 5. As a result, the red correction LED unit 10b is configured.
[0029]
In the LED light emitting device 10 having the above-described configuration, the white LED portion 10a emits white light Pw by the same operation as the white LED light emitting device 40 shown in FIG. 15, and the red correction LED portion 10b is red light Pr. Further, the valley region correction LED unit 10c emits green light Pg in the emission wavelength band between the emission wavelength band of the blue LED 1 and the excitation emission wavelength band of the fluorescent particles 4 that are the yellow phosphors. . As a result, the white light Pw, the red light Pr, and the green light Pg are mixed from the LED light emitting device 10 to emit white light Pwh with excellent color rendering after color correction.
Although the LED light emitting device 10 is mounted on one substrate 14, it is desirable that the entire LED light emitting device 10 is housed in one case having a reflecting portion.
[0030]
Next, the light emission wavelength characteristics of the LED light emitting device 10 will be described with reference to FIGS. FIG. 4 is an emission wavelength characteristic diagram showing each emission wavelength of the white LED unit 10a, the red correction LED unit 10b, and the valley region correction LED unit 10c, and FIG. 5 is a light emission combining the three emission wavelengths shown in FIG. It is a wavelength characteristic figure.
[0031]
In FIG. 4, the white light Pw is the same as the emission wavelength curve H <b> 1 shown in FIG. 16, a large peak Kb near 450 nm that is the blue light Pb component of the blue LED 1, and yellow due to excitation of the fluorescent particles 4. It has a peak Ky in the vicinity of 550 nm which is a light Py component. The red light Pr has a large peak Kr near 650 nm, which is a red light Pr component by the red LED 2, and the green light Pg has a large peak Kg near 500 nm, which is a green light Pg component by the green LED 3a.
[0032]
The light emission wavelength curve H10 shown in FIG. 5 is obtained by synthesizing the three light emission wavelength components in FIG. 4, and the light emission wavelength curve H2 by the conventional red color correcting phosphor-mixed white LED shown in FIG. In comparison, it can be seen that the drop in the valley region near 500 nm is greatly improved.
As the green LED 3a for correcting the valley region, it is desirable to use a green LED having a relatively short wavelength, and the wavelength range is a valley region near 500 nm by using a green LED having a wavelength of 490 nm to 520 nm. It was possible to correct.
[0033]
Further, as the yellow phosphor in the present invention, a YAG phosphor is used, and in particular, a phosphor such as delbium, strontium, phosphate, silicate, and aluminate is used. As a result, good yellow light emission was obtained. With the above configuration, as shown in FIG. 5, in the first embodiment using a short wavelength band green LED as a valley region correction LED, the color rendering property as a white light source is enhanced by complementing the valley of the spectrum in the 500 nm band. The effect is extremely large.
[0034]
FIG. 6 is a circuit block diagram showing a drive circuit of the LED light emitting device 10, and the LED light emitting device 10 represents the blue LED1, the red LED2, the green LED 3a, and the connection electrodes 11, 12, 13 by circuit symbols. Is. Reference numeral 20 denotes a drive circuit, which includes a current adjusting device 15, an operation control device 16, and a power supply device 17 for supplying current to the three LEDs. The current adjusting device 15 has three variable resistors 15a, 15b and 15c, and the operation control device 16 has three switches 16a, 16b and 16c.
[0035]
The configuration of the drive circuit 20 is such that the three LEDs of the LED light emitting device 10, the three variable resistors of the current adjusting device 15, and the three switches of the operation control device 16 are connected in series, respectively. It is connected to the. That is, the blue LED 1 of the LED light emitting device 10 is connected in series to the variable resistor 15a, the switch 16a, and the power supply device 17 via the connection electrode 11, and similarly the red LED 2 is connected to the variable resistor 15b via the connection electrode 12. The switch 16b and the power supply device 17 are connected in series, and the green LED 3a is further connected in series to the variable resistor 15c, the switch 16c, and the power supply device 17 via the connection electrode 13.
[0036]
Next, the operation of the drive circuit 20 will be described. Since the current adjusting device 15 and the operation control device 16 have variable resistors and switches that can be controlled independently for the three LEDs of the LED light emitting device 10, each LED can be controlled to be turned on and off independently. I can do it. That is, the blue LED 1 can be turned on and off by the switch 16a, and the brightness can be adjusted by adjusting the variable resistor 15a in the on state. The red LED 2 can be similarly controlled by the switch 16b and the variable resistor 15b, and the green LED 3a can be similarly controlled by the switch 16c and the variable resistor 15c.
[0037]
As described above, since the LED light emitting device 10 can independently control three LEDs, each LED can emit light independently, two LEDs can emit light in combination, and three LEDs can emit light in combination, for a total of seven kinds. Luminescence can be obtained. For example, white light Pw, red light Pr, and green light Pg shown in FIG. 4 are emitted in the case of single light emission of each LED, and the emission wavelength curve H2 shown in FIG. 17 in the case of combined light emission of blue LED 1 and red LED 2. In the case of simultaneous emission of the blue LED 1, the red LED 2, and the green LED 3a, the emission wavelength curve H10 shown in FIG. 5 is emitted.
[0038]
Therefore, the method of adjusting the white light Pwh using the drive circuit 20 is performed when all the switches 16a to 16c of the operation control circuit 16 are set to NO and all the blue LED 1, red LED 2, and green LED 3a are lit. By adjusting the variable resistors 15a to 15c of the current adjustment circuit 15, the emission wavelength curve H10 of the combined emission is adjusted to the optimum state.
[0039]
FIG. 7 is a circuit block diagram showing another embodiment of the drive circuit. The drive circuit 21 in this embodiment is different from the drive circuit 20 in that the three switches 18a are different from the operation control device 16. ˜18c is added to the operation control device 18.
[0040]
The switch 18a is drawn directly from the blue LED 1 side of the variable resistor 15a in the current adjusting device 15, that is, from the connection electrode 11 side of the blue LED 1. Therefore, when the switch 16a is turned on, the lighting control of the blue LED 1 is light emission adjusted through the variable resistor 15a, and when the switch 18a is turned on, light is emitted directly without going through the variable resistor 15a. Brighter light emission. The above control operation is similarly performed for the red LED 2 and the green LED 3a by the switches 18b and 18c.
[0041]
According to the drive circuit 21, it is possible to properly use the adjusted light emission and the direct light emission by appropriately using the switches 16a to 16c and the switches 18a to 18c. That is, white light that is adjusted using a variable resistor can be emitted in combined light emission, and brighter light can be emitted without using a variable resistor in single light emission.
[0042]
Further, as the usage of the drive circuit 21, the combined light emission can be performed using the switches 18a to 18c when it is desired to emit bright white light even if the color rendering is slightly reduced. Even in the case of single light emission, by performing the adjustment light emission using the switches 16a to 16c, the brightness of the light emission is slightly reduced, but the energy-extinguishing can be performed.
[0043]
FIG. 8 is a plan view of an LED light emitting device 30 showing a second embodiment of the present invention. The same elements as those of the LED light emitting device 10 shown in FIG. The basic structure of the LED light emitting device 30 is the same as that of the LED light emitting device 10 in the first embodiment, except that the third LED 3 is a blue LED having a longer wavelength band than the blue LED 1 instead of the green LED 3a. This is because the LED 3b is used, and the long wavelength blue light PbL from the blue LED 3b is emitted from the valley region correction LED unit 30c.
[0044]
FIG. 9 is a light emission wavelength characteristic diagram showing each light emission wavelength of the white LED unit 10a, the red correction LED unit 10b, and the valley region correction LED unit 30c, and FIG. 10 is a light emission combining the three light emission wavelengths shown in FIG. It is a wavelength characteristic figure.
[0045]
In FIG. 9, the white light Pw and the red light Pr have the same wavelength characteristics as the LED light emitting device 10 shown in FIG. 4, but the long wavelength blue light PbL is 480 nm which is a long wavelength blue light PbL component by the blue LED 3b. It has a large peak KbL in the vicinity. The three emission wavelength components in FIG. 9 are synthesized to an emission wavelength curve H30 shown in FIG. 10, and like the emission wavelength curve H10 of the LED light emitting device 10, the conventional red correction method shown in FIG. It can be seen that the drop in the valley region in the vicinity of 500 nm is greatly improved as compared with the emission wavelength curve H2 of the phosphor mixed color type white LED.
[0046]
As the blue LED 3b for correcting the valley region, it is desirable to use a blue LED having a relatively long wavelength, and the wavelength range is about 500 nm by using a long wavelength blue LED having a wavelength of 470 nm to 490 nm. It was possible to correct the valley area.
With the above configuration, as shown in FIG. 10, in the second embodiment using a long wavelength band blue LED as a valley region correction LED, the color rendering as a white light source is enhanced by complementing the valley of the spectrum in the 500 nm band. At the same time, it has the effect of reducing redness as a white light source by the red LED added to enhance the color rendering. This is because the blue LED in the long wavelength band emits light having a complementary color relationship with the red LED.
[0047]
11 and 12 are plan views showing other embodiments of the LED light emitting device according to the present invention. The LED light emitting device 25 shown in FIG. 11 includes a blue LED 1, a red LED 2 and a third LED mounted on the substrate 14. All of the LEDs 3 are covered with a transparent resin 5 mixed with fluorescent particles 4. In addition, the LED light emitting device 26 shown in FIG. 12 changes the arrangement of each LED mounted on the substrate 14, arranges the red LED 2 and the third LED 3 horizontally, and makes the blue LED 1 independent, so that only the blue LED 1 is fluorescent. The transparent resin 5 mixed with the particles 4 is covered, and the red LED 2 and the third LED 3 are covered with the transparent resin 5.
[0048]
Here, the light emission characteristics of the LED light emitting device 10, the LED light emitting device 25, and the LED light emitting device 26 shown in FIGS. 1, 11, and 12 will be compared. First, as a property of the fluorescent particles 4, when light with a short wavelength collides, it is excited and emits yellow light Py. When light with a long wavelength collides, it is not excited and emits yellow light Py. Not. Therefore, when the blue light Pb with a short wavelength collides, a lot of excitation occurs and the strong yellow light Py is emitted, and the emission of the third LED with a short wavelength, that is, the green light Pg with a short wavelength, When the blue light PbL collides, a little excitation occurs and a small amount of yellow light Py is emitted. When the red light Pr having a longer wavelength collides, excitation does not occur and the yellow light Py is not emitted.
[0049]
Based on the above principle, the LED light-emitting device 26 shown in FIG. 12 is covered with the transparent resin 5 in which only the blue LED 1 is mixed with the fluorescent particles 4, and the red LED 2 and the third LED 3 are covered with the transparent resin 5. Therefore, only excitation by the blue light Pb occurs, and the red light Pr, the green light Pg, and the blue light PbL do not collide with the fluorescent particles 4, so that the light emission characteristics as shown in FIGS. 4 and 9 are obtained.
[0050]
Further, in the LED light emitting device 10 shown in FIG. 1, since the blue LED 1 and the third LED 3 are covered with the transparent resin 5 mixed with the fluorescent particles 4, and only the red LED 2 is covered with the transparent resin 5, the blue light Pb And excitation by green light Pg or blue light PbL occur, and red light Pr does not collide with fluorescent particles 4. As a result, the blue light Pb and the red light Pr are the same as those of the LED light emitting device 26. However, when the green light Pg or the blue light PbL collides with the fluorescent particles 4, a little yellow light Py is emitted and the green light P When Pg or blue light PbL collides with the fluorescent particles 4, it is slightly attenuated. Therefore, the LED light emitting device 10 slightly increases the yellow light Py component but decreases the green light Pg component or the blue light PbL component as compared with the LED light emitting device 26.
[0051]
Furthermore, since the LED light emitting device 25 shown in FIG. 11 is covered with the transparent resin 5 in which the blue LED 1, the red LED 2, and the third LED 3 are all mixed with the fluorescent particles 4, the blue LED 1 and the third LED 3 are Although it is the same as the LED light emitting device 10 shown in FIG. 1, the red light Pr is slightly attenuated by colliding with the fluorescent particles 4. Therefore, the LED light emitting device 25 slightly increases the yellow light Py component compared to the LED light emitting device 26, but decreases the red light Pr component and the green light Pg component or the blue light PbL component.
[0052]
As described above, the relationship between the three LED light emitting devices is that the LED light emitting device 26 is a basic form, and the LED light emitting device 10 has the merit that the light emitting component of the third LED 3 is attenuated slightly, but the yellow light Py component is increased. Further, the LED light emitting device 25 attenuates the light emitting component of the red LED 2 and the light emitting component of the third LED 3 slightly, but the yellow light Py component is increased and the molding process is completed once, so that the manufacturing cost is low. There is a merit that
[0053]
FIG. 13 is a perspective view of a color display device using the LED light emitting device of the present invention as an illumination light source. In FIG. 13, 60 is a display device such as a liquid crystal provided with a color filter, and 70 is a light guide disposed on the lower surface side of the display device 60, and the LED light emitting device 10 is disposed on the side surface of the light guide 70. Is arranged. The LED light emitting device 10 is controlled to emit light by the drive circuit 20 to supply the display device 60 with suitable white light emission Pwh color-corrected, bright white light emission Pw, and monochromatic light emission for each LED. I can do it.
[0054]
【The invention's effect】
As described above, in the present invention, the third LED having a light emission wavelength band between the light emission wavelength band of the blue LED and the excitation light emission wavelength band of the yellow phosphor is added to the phosphor color mixture type white light emitting device of the red correction method. By emitting light, it was possible to correct a light emitting component in the vicinity of 500 nm, which is a valley of wavelengths, and it was possible to provide a white light source excellent in color rendering.
[0055]
That is, in the LED light-emitting device of the present invention, the color rendering property for green color can be greatly improved, and the brightness as illumination light can be increased by exciting the fluorescent particles by the light emission of the third LED.
In addition, an LED light-emitting device capable of supplying various types of light emission including white light emission with high color rendering by providing a drive circuit that can be independently controlled for each LED and a full-color display device using the LED light-emitting device as a backlight are provided. I was able to.
[0056]
Furthermore, in the LED light emitting device according to the present invention, in the first embodiment using the green LED in the short wavelength band as the valley region correction LED, the color rendering as the white light source is complemented particularly in the valley of the spectrum in the wavelength of 500 nm band. In the second embodiment using a long wavelength band blue LED as a valley region correction LED, the redness as a white light source by the red LED added to enhance the color rendering is obtained. The effect of mitigating is great.
[Brief description of the drawings]
FIG. 1 is a plan view of an LED light-emitting device showing a first embodiment of the present invention.
2 is a cross-sectional view taken along line AA of the LED light-emitting device shown in FIG.
FIG. 3 is a cross-sectional view of the LED light emitting device shown in FIG.
FIG. 4 is an emission wavelength characteristic diagram of each LED of the LED light-emitting device showing the first embodiment of the present invention.
FIG. 5 is a light emission wavelength characteristic diagram of the LED light-emitting device showing the first embodiment of the present invention.
FIG. 6 is a circuit block diagram of a drive circuit of the LED light emitting device according to the present invention.
FIG. 7 is a circuit block diagram showing another embodiment of a drive circuit according to the present invention.
FIG. 8 is a plan view of an LED light-emitting device showing a second embodiment of the present invention.
FIG. 9 is a light emission wavelength characteristic diagram of each LED of an LED light emitting device showing a second embodiment of the present invention.
FIG. 10 is a light emission wavelength characteristic diagram of an LED light emitting device showing a second embodiment of the present invention.
FIG. 11 is a plan view of an LED light-emitting device showing another embodiment of the present invention.
FIG. 12 is a plan view of an LED light-emitting device showing another embodiment of the present invention.
FIG. 13 is a perspective view of a color display device using the LED light-emitting device of the present invention as a light source.
FIG. 14 is a cross-sectional view of a conventional phosphor mixed color type white LED light emitting device.
FIG. 15 is an enlarged partial cross-sectional view of the conventional phosphor mixed color white LED light emitting device shown in FIG. 14;
FIG. 16 is an emission wavelength characteristic diagram of a conventional phosphor-mixed white LED light emitting device.
FIG. 17 is a light emission wavelength characteristic diagram of a white LED light emitting device of a conventional red correction method.
[Explanation of symbols]
1 Blue LED
2 Red LED
3 Third LED
3a Short wavelength green LED
3b Blue LED with long wavelength band
4 fluorescent particles
10, 25, 26, 30 LED light emitting device
15 Current controller
16, 18 Operation control device
20, Drive circuit
60 Display device
70 Light guide

Claims (16)

ＬＥＤを発光源とし、表示装置のバックライトや照明等を行なう発光装置において、前記発光源は第１のＬＥＤである青色ＬＥＤと、該青色ＬＥＤに被覆された黄色系蛍光体と、第２のＬＥＤである赤色ＬＥＤと、前記青色ＬＥＤの発光波長帯域と前記黄色系蛍光体の励起発光波長帯域との間の発光波長帯域を有する第３のＬＥＤとにより構成されることを特徴とするＬＥＤ発光装置。In a light-emitting device that uses an LED as a light-emitting source and performs backlighting, illumination, and the like of a display device, the light-emitting source is a blue LED that is a first LED, a yellow phosphor that is coated on the blue LED, and a second LED light emission comprising a red LED, which is an LED, and a third LED having an emission wavelength band between the emission wavelength band of the blue LED and the excitation emission wavelength band of the yellow phosphor apparatus. 前記第３のＬＥＤは短波長帯域の緑色ＬＥＤである請求項１記載のＬＥＤ発光装置。The LED light-emitting device according to claim 1, wherein the third LED is a green LED having a short wavelength band. 前記第３のＬＥＤの発光波長帯域は４９０〜５２０ｎｍである請求項２記載のＬＥＤ発光装置。The LED light emitting device according to claim 2, wherein an emission wavelength band of the third LED is 490 to 520 nm. 前記第３のＬＥＤは前記第１のＬＥＤよりも長波長帯域の青色ＬＥＤである請求項１記載のＬＥＤ発光装置。The LED light-emitting device according to claim 1, wherein the third LED is a blue LED having a longer wavelength band than the first LED. 前記第３のＬＥＤは発光波長帯域は４７０〜４９０ｎｍである請求項４記載のＬＥＤ発光装置。The LED light emitting device according to claim 4, wherein the third LED has an emission wavelength band of 470 to 490 nm. 前記第３のＬＥＤは黄色系蛍光体によって被覆されている請求項１記載のＬＥＤ発光装置。The LED light-emitting device according to claim 1, wherein the third LED is covered with a yellow phosphor. 前記黄色系蛍光体はＹＡＧ系蛍光体である請求項１記載のＬＥＤ発光装置。The LED light-emitting device according to claim 1, wherein the yellow phosphor is a YAG phosphor. 前記黄色系蛍光体はリン酸塩系、ケイ酸塩系、アルミン酸塩系、の何れか１つの蛍光体である請求項１記載のＬＥＤ発光装置。The LED light emitting device according to claim 1, wherein the yellow phosphor is any one of a phosphor, a silicate, and an aluminate. 前記黄色系蛍光体はテレビウム系の蛍光体である請求項１記載のＬＥＤ発光装置2. The LED light emitting device according to claim 1, wherein the yellow phosphor is a television phosphor. 前記黄色系蛍光体はストロンチウム系の蛍光体である請求項１記載のＬＥＤ発光装置2. The LED light emitting device according to claim 1, wherein the yellow phosphor is a strontium phosphor. 前記第１〜第３のＬＥＤが１つの基板上に収納されている請求項１乃至請求項１０記載のＬＥＤ発光装置。The LED light-emitting device according to claim 1, wherein the first to third LEDs are housed on a single substrate. 前記第１〜第３のＬＥＤが１つの基板上に実装され、黄色系蛍光粒子を含む透明樹脂にて封止されている請求項１１記載のＬＥＤ発光装置。The LED light-emitting device according to claim 11, wherein the first to third LEDs are mounted on a single substrate and sealed with a transparent resin containing yellow fluorescent particles. 前記第１〜第３のＬＥＤが１つのケース内に収納されている請求項１２記載のＬＥＤ発光装置。The LED light-emitting device according to claim 12, wherein the first to third LEDs are housed in one case. 第１のＬＥＤである青色ＬＥＤと、該青色ＬＥＤに被覆された黄色系蛍光体と、第２のＬＥＤである赤色ＬＥＤと、前記青色ＬＥＤの発光波長帯域と前記黄色系蛍光体の励起発光波長帯域との間の発光波長帯域を有する第３のＬＥＤとにより構成されたＬＥＤ発光装置と、該ＬＥＤ発光装置を照明光源する表示装置とにより構成されたことを特徴とするカラー表示装置。The blue LED as the first LED, the yellow phosphor coated on the blue LED, the red LED as the second LED, the emission wavelength band of the blue LED and the excitation emission wavelength of the yellow phosphor A color display device comprising: an LED light-emitting device including a third LED having a light emission wavelength band between the band and a display device that illuminates the LED light-emitting device. 前記ＬＥＤ発光装置を構成する３個のＬＥＤを各々独立に点燈制御可能な動作制御手段を備えた請求項１４記載のカラー表示装置。The color display device according to claim 14, further comprising an operation control unit capable of independently controlling the three LEDs constituting the LED light emitting device. 前記ＬＥＤ発光装置を構成する３個のＬＥＤを各々独立に電流制御が可能な、電流制御手段を備えた請求項１４記載のカラー表示装置。The color display device according to claim 14, further comprising a current control unit capable of independently controlling a current of three LEDs constituting the LED light emitting device.
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