JP4531345B2

JP4531345B2 - Projection display

Info

Publication number: JP4531345B2
Application number: JP2003099011A
Authority: JP
Inventors: 雅夫狩野
Original assignee: オスラム・メルコ株式会社
Priority date: 2003-04-02
Filing date: 2003-04-02
Publication date: 2010-08-25
Anticipated expiration: 2023-04-02
Also published as: JP2004309543A

Description

【０００１】
【発明の属する技術分野】
この発明は、光源からの光を光変調素子により映像情報に応じて光学的に変調した映像をスクリーンに拡大投写する投写型表示装置に関する。
【０００２】
【従来の技術】
図８は従来の投写型表示装置の構成図である。図において、光源部１０は、凹面反射鏡１５の内部に発光管１１の中心軸と凹面反射鏡１５の光軸を一致させて構成されている。点灯装置２１は発光管１１に電力を供給する。コンデンサレンズ６は光源部１０から放射される光束を集光する。赤色分離用ダイクロイックミラー４１は、コンデンサレンズ６を透過した光束の赤色成分を反射し、緑色と青色成分を透過する。緑色分離用ダイクロイックミラー４２は、赤色分離用ダイクロイックミラー４１を透過した緑色と青色成分の光の緑色成分を反射し、青色成分を透過する。第２ミラー４３は、緑色分離用ダイクロイックミラー４２を透過した青色成分の光を反射する。第１ミラー４６は、赤色分離用ダイクロイックミラー４１で分離された赤色成分の光を反射する。第３ミラー４８は第２ミラー４３の反射光を反射する。
【０００３】
赤色分離用ダイクロイックミラー４１、ダイクロイックミラー４１、緑色分離用ダイクロイックミラー４２及び第１ミラー４６、第２ミラー４３、第３ミラー４８で色分離部が構成される。
【０００４】
赤色用光変調素子５１は、色分離部の第１ミラー４６で反射した赤色の光を映像情報に応じて光学的に変調する。緑色用光変調素子５２は、色分離部の緑色分離用ダイクロイックミラー４２で反射した緑色の光を映像情報に応じて光学的に変調する。青色用光変調素子５３は、色分離部の第３ミラー４８で反射した青色の光を映像情報に応じて光学的に変調する。赤色用光変調素子５１、緑色用光変調素子５２、青色用光変調素子５３で光変調部が構成される。
【０００５】
ダイクロイックプリズム７は、光変調部の赤色用光変調素子５１、緑色用光変調素子５２、青色用光変調素子５３で映像情報に応じて光学的に変調された光を合成する。投写レンズ８はダイクロイックプリズム７で合成された光をスクリーンに投写する。
【０００６】
光源部１０、コンデンサレンズ６、色分離部、光変調部の順で配置して光路を構成し、光源部１０が放射する光束を色分離部で選択的に分離した赤、緑、青色の光を光変調部で映像情報に応じて光学的に変調し、ダイクロイックプリズム７で合成した映像を投写レンズ８によりスクリーンに投写する。
【０００７】
【特許文献１】
特開２００１−２９６６０７号公報
【０００８】
【発明が解決しようとする課題】
従来の投写型表示装置は以上のように構成されているので、発光管１１の光束のばらつきや、凹面反射鏡１５の光軸と発光管１１の中心軸との僅かなずれによる光源部１０が放射する光束のばらつきで、スクリーンに投写される映像の明るさがばらつくという問題点があった。
【０００９】
また、複数の投写型表示装置の画面を近接もしくは密着して配列構成するマルチ画面用途では、それぞれの投写型表示装置が投写する映像の明るさにばらつきがあると、複数の画面にまたがる映像の明るさが画面の接続部分で不連続となり視認性や画質を損なうという問題点があった。
【００１０】
この発明は、光源からの光を光変調素子により映像情報に応じて光学的に変調した映像をスクリーンに拡大投写する投写型表示装置おいて、光源の明るさを設定したレベルに調節することを目的とする。
【００１１】
【課題を解決するための手段】
この発明に係る投写型表示装置は、光源から出射された光束を光変調部により映像情報に応じて光学的に変調した映像光をスクリーンに拡大投写する投写型表示装置おいて、光源と光変調部との間に配置されて光源の放射光束に対応する光量を検出する光量検出部と、投写映像に必要とする明るさに対応した明るさレベルを設定する明るさ設定部と、光量検出部の検出レベルと明るさ設定部の明るさレベルを比較してレベル差に応じた調光レベルを出力する明るさ比較部と、明るさ比較部からの調光レベルで光源の点灯電力を調節する調光点灯装置と、を備えたことを特徴とする。
【００１２】
また、この発明に係る投写型表示装置は、光源と光量検出部の間に有効光束の範囲を規制するアパチャーを設けたことを特徴とする。
【００１３】
また、この発明に係る投写型表示装置は、光量検出部は、透光性材料に波長変換体を含有させ隣接する面が互いに直交する平板状の第１の波長変換導光素子と光量センサーとを備え、第１の波長変換導光素子の光入射面及び対向する光出射面に直交する面に光量センサーを取り付けたことを特徴とする。
【００１４】
また、この発明に係る投写型表示装置は、光量検出部は、透光性材料に波長変換体を含有させ隣接する面が互いに直交する平板状の第１の波長変換導光素子と、透光性材料に波長変換体を含有させ隣接する面が互いに直交する直方体状の第２の波長変換導光素子と、光量センサーとを備え、第１の波長変換導光素子の光入射面及び対向する光出射面以外の面に第２の波長変換導光素子を対向するように配置し、第２の波長変換導光素子に光量センサーを取り付けたことを特徴とする。
【００１５】
また、この発明に係る投写型表示装置は、波長変換導光素子は、透光性のガラスに希土類イオンの波長変換体を含有して形成したことを特徴とする。
【００１６】
また、この発明に係る投写型表示装置は、波長変換導光素子は、透光性の樹脂に蛍光体の波長変換体を含有して形成したことを特徴とする。
【００１７】
また、この発明に係る投写型表示装置は、第２の波長変換導光素子に含有する第２波長変換体は、第１の波長変換導光素子に含有する第１波長変換体の発光波長で励起されて発光することを特徴とする。
【００１８】
また、この発明に係る投写型表示装置は、第１の波長変換導光素子は、光の入射面と、光の出射面と、光量センサーの取り付け面もしくは光量センサーの取り付け面の光量センサーに対向する部分とを除いた面を反射面としたことを特徴とする。
【００１９】
また、この発明に係る投写型表示装置は、第１の波長変換導光素子は、光の入射面と前記光の出射面と、第２の波長変換導光素子が密着して配置された面とを除いた面を反射面とし、第２の波長変換導光素子は、第１の波長変換導光素子に対向する面と、光量センサーの取り付け面もしくは光量センサーの取り付け面の光量センサーに対向する部分とを除いた面を反射面としたことを特徴とする。
【００２０】
また、この発明に係る投写型表示装置は、波長変換導光素子の反射面は、外面を低反射率面としたことを特徴とする。
【００２１】
【発明の実施の形態】
以下、この発明の実施の形態を図面に基づいて説明する。
実施の形態１．
図１は実施の形態１を示す図で、投写型表示装置の構成図である。
色分離部、光変調部、ダイクロイックプリズム７、投写レンズ８については、従来のものと同一であり説明は省略する。
【００２２】
図１に示すように、光源部１０の出射光束に対応する光量を検出する光量検出部３０を光源部１０とコンデンサレンズ６の間に配置する。投写映像の明るさに対応する明るさレベルを設定する明るさ設定部２７を設ける。光量検出部３０の検出レベルと明るさ設定部２７の明るさレベルを比較して調光レベルを出力する明るさ比較部２６を設ける。明るさ比較部２６が出力した調光レベルで発光管１１の点灯電力を調節する調光点灯装置２５を配置する。
【００２３】
明るさ比較部２６は、光量検出部３０が検出した光量レベルが明るさ設定部２７に設定された明るさレベルより高い場合には、調光点灯装置２５に光量レベルと明るさレベルの差に対応して光量を減らす調光レベルの信号を出力し、光量検出部３０が検出した光量レベルが明るさ設定部２７に設定された明るさレベルより低い場合には、調光点灯装置２５に光量レベルと明るさレベルの差に対応して光量を増す調光レベルの信号を出力する。
【００２４】
調光点灯装置２５は、明るさ比較部２６からの調光レベル信号に応じて光源部１０の発光管１１の点灯電力を増減し、明るさ設定部２７に設定された明るさで映像を表示する。
【００２５】
光量検出部３０は、光源部１０とコンデンサレンズ６の間に配置する例を示したが、光源部１０から光変調部に至る光路中に配置すればよい。
【００２６】
上述の実施の形態によれば、光源部１０とコンデンサレンズ６の間に光源の放射光束に対応する光量を検出する光量検出部３０を配置し、投写映像に必要とする明るさに対応して設定された明るさレベルと光量検出部３０の検出レベルとを比較してレベル差に応じた調光レベルで光源の点灯電力を調節するので、光源の放射光束のばらつきに起因する映像光の明るさのばらつきが低減される効果がある。
【００２７】
さらに、複数の投写型表示装置の画面を近接もしくは密着して配列構成するマルチ画面用途では、それぞれの投写型表示装置が投写する映像の明るさのばらつきが抑えられるので、複数の投写型表示装置の画面にまたがる映像の明るさが画面の接続部分で不連続とならず、良好な視認性や画質が得られる効果がある。
【００２８】
実施の形態２．
図２は実施の形態２を示す図で、投写型表示装置の構成図である。
図に示すように、光源部１０と光量検出部３０の間に有効光束の範囲を規制するアパチャー５を設けた。アパチャ−５は、光源部１０から放射される光束のうち映像表示に適した有効な光束のみを通過させるので、光量検出部３０の検出レベルに基づいて調光点灯装置２５で調光する光源部１０の光量の増減と表示の明暗が対応し、明るさ設定部２７に設定した明るさレベルに映像表示の明るさを一致させることができる。
【００２９】
複数の投写型表示装置の画面を近接もしくは密着して配列構成するマルチ画面用途では、それぞれの投写型表示装置が投写する映像の明るさが同じになり、複数の画面にまたがる映像の明るさが画面の接続部分で連続的に変化するので視認性や画質を損なうといった問題がなくなる。
【００３０】
実施の形態３．
図３、４は実施の形態３を示す図で、図３は波長変換導光素子の原理図、図４は第１の光量検出部の構成図である。
図３において、波長変換導光素子３６は、ガラスや樹脂などの透光性材料３７に、照射された光で励起されて発光し、照射光とは異なる波長の光を放射する波長変換体３８を含有して形成される。波長変換導光素子３６は、波長変換体３８を含有した透光性材料３７を隣接する面が互いに直交する平板状や直方体状に形成した構造である。
【００３１】
励起発光の光は、波長変換導光素子３６の中を四方に放射され平面や直方体の端面に到達し、透光性材料３７の屈折率に応じて波長変換導光素子３６の外部へ放射されたり、全反射して波長変換導光素子３６の他の面へ向かう。
【００３２】
全反射した光は、波長変換導光素子３６の端面で再び外部放射と全反射を繰り返すので、励起発光の光は平面や直方体の全ての端面から外部へと放射される。
【００３３】
波長変換導光素子３６が隣接する面が互いに直交する平板状や直方体状に形成した構造のため、入射光は入射面及び対向する出射面から外部へ放射されるが、入射面と出射面に直交する面に到達した入射光は全反射するので、入射面と出射面に直交する面から外部へは放射されない。
【００３４】
以上説明したように、透光性材料３７に波長変換体３８を含有して隣接する面が互いに直交する平板状や直方体状に形成した構造の波長変換導光素子３６は、入射した光量に比例して励起される波長変換体３８の発光を、入射面及び出射面に直交する面から外部へ放射するので、かかる面で外部へ放射される光量を検出することができる。
【００３５】
図４に示すように、光量検出部３０は、透光性材料に波長変換体を含有させ隣接する面が互いに直交する平板状の第１の波長変換導光素子３１と光量センサー３９とから構成され、第１の波長変換導光素子３１における光の入射面及び対向する出射面に直交する面の１つに光量センサー３９を取り付けた構造である。
【００３６】
光量検出部３０は、第１の波長変換導光素子３６に入射する光源部１０の放射光束により波長変換体が励起されて発光するので、光の入射面及び対向する出射面に直交する面の１つに光量センサー３９を取り付けて光源部１０が放射する光束に比例した光量を検出することができる。
【００３７】
光量センサー３９を、第１の波長変換導光素子３６の光の入射面及び対向する出射面に直交する面の１つに取り付けたものを示したが、光の入射面及び対向する出射面に直交する複数の面に取り付けてもよい。
【００３８】
実施の形態４．
図５は実施の形態４を示す図で、第２の光量検出部の構成図である。
図に示すように、光量検出部３０は、透光性材料に波長変換体を含有させ隣接する面が互いに直交する平板状の第１の波長変換導光素子３１と、透光性材料に波長変換体を含有させ隣接する面が互いに直交する直方体状の第２の波長変換導光素子３２と、光量センサー３９とから構成される。第１の波長変換導光素子３１における光の入射面及び対向する出射面に直交する面の１つに第２の波長変換導光素子３２の長辺の１つを対向するようにして近接して配置し、第２の波長変換導光素子３２の短辺の１つに光量センサー３９を取り付けた構造である。
【００３９】
第１の波長変換導光素子３１における光の入射面及び対向する出射面に直交する面の１つに第２の波長変換導光素子３２の長辺の１つを対向するようにして近接して配置したが、第１の波長変換導光素子３１における光の入射面及び対向する出射面に直交する面に、第２の波長変換導光素子３２を対向するように配置すればよい。
【００４０】
また、第２の波長変換導光素子３２の短辺の１つに光量センサー３９を取り付けた構造としたが、他の部位でもよく、第２の波長変換導光素子３２に光量センサー３９を取り付けた構造であればよい。
【００４１】
第１の波長変換導光素子３１に含有する波長変換体の励起発光を、第２の波長変換導光素子３２の長辺の１つで受光し、受光した入射光で第２の波長変換導光素子３２に含有する波長変換体を励起発光させて、直方体の短辺の１つに設けた光量センサー３９で検出するので、第１の波長変換導光素子３１、第２の波長変換導光素子３２から放射される波長変換体の励起発光を効率よく光量センサー３９に導くことができ、光源部１０が放射する光束量の検出精度が向上する。
【００４２】
実施の形態５．
第１の波長変換導光素子３１及び第２の波長変換導光素子３２は、透光性のガラスに希土類イオンの波長変換体を含有して形成する。第１の波長変換導光素子３１及び第２の波長変換導光素子３２が透光性のガラスなので、光源部１０に近接する高温部分にも配置することができる。
【００４３】
実施の形態６．
第１の波長変換導光素子３１及び第２の波長変換導光素子３２は、透光性の樹脂に蛍光体の波長変換体を含有して形成する。第１の波長変換導光素子３１及び第２の波長変換導光素子３２が透光性の樹脂なので、比較的低温で形成することができる。
【００４４】
実施の形態７．
第２の波長変換導光素子３２に含有する第２波長変換体を、第１の波長変換導光素子３１に含有する第１波長変換体の発光波長で励起されて発光する波長変換体とする。
【００４５】
波長変換体は励起光の波長と発光波長が異なるので、第２の波長変換導光素子３２に含有する第２波長変換体の励起波長を第１の波長変換導光素子３１に含有する第１波長変換体の発光波長に一致もしくは近似する波長とすると、光源部１０の放射する光束の入射光により励起された第１の波長変換導光素子３１の第１波長変換体の発光で第２の波長変換導光素子３２の第２波長変換体を効率よく励起発光することができる。
【００４６】
実施の形態８．
図６は実施の形態８を示す図で、第１の波長変換導光素子の斜視図である。図に示すように、第１の波長変換導光素子３１は、光源部１０の放射する光束の入射面と、入射面に対向する出射面と、光量センサー３９の取り付け面とを除く面を反射面３３とした構造である。
【００４７】
また、光量センサー３９の取り付け面は、光量センサー３９に対向する部分を除いて反射面３３とした構造でもよい。
【００４８】
第１波長変換体の発光が第１の波長変換導光素子３１の全ての面から外部へ放射されるので、光源部１０の放射する光束の入射面、入射面に対向する出射面、光量センサー３９の取り付け面もしくは光量センサー３９に対向する部分を除いた面を反射面３３とすると、第１波長変換体の発光を効率よく光量センサー３９に導くことができる。
【００４９】
実施の形態９．
図７は実施の形態９を示す図で、第２の波長変換導光素子の斜視図である。図に示すように、第１の波長変換導光素子３１は、光源部１０の放射する光束の入射面と、入射面に対向する出射面と、第２の波長変換導光素子３２が近接して配置された面とを除く面を反射面３３とし、第２の波長変換導光素子３２は、第１の波長変換導光素子３１に対向する面と、光量センサー３９の取り付け面の光量センサー３９に対向する部分とを除いた面を反射面３３とした構造である。
【００５０】
また、第２の波長変換導光素子３２は、第１の波長変換導光素子３１に対向する面と、光量センサー３９の取り付け面とを除いた面を反射面３３とした構造でもよい。
【００５１】
第１の波長変換導光素子３１の光源部１０の放射する光束の入射面、入射面に対向する出射面、第２の波長変換導光素子３２が近接して配置された面とを除いた面を反射面３３とし、第２の波長変換導光素子３２の第１の波長変換導光素子３１に対向する面、光量センサー３９に対向する部分とを除いた面もしくは光量センサー３９の取り付け面を反射面３３とすると、第１波長変換体の発光を効率よく光量センサー３９に導くことができる。
【００５２】
実施の形態１０．
第１の波長変換導光素子３１、第２の波長変換導光素子３２の反射面３３は、外面を低反射率面とした構造である。
第１の波長変換導光素子３１、第２の波長変換導光素子３２の反射面３３の外面を低反射率面とすると、第１の波長変換導光素子３１、第２の波長変換導光素子３２の表面で反射して光源部１０から光変調部に至る光路に混入して表示する映像に支障となる不要光を低減することができる。
【００５３】
上述の実施の形態においては、ダイクロイックミラーによる色分離部、３個の光変調素子の光変調部、ダイクロイックプリズムで構成された投写型表示装置としたが、かならずしもこの構成に限定されるものではなく、色フィルターによる色分離部、光変調素子が１個の光変調部、ダイクロイックプリズムを用いないで構成された投写型表示装置であってもよい。
【００５４】
【発明の効果】
この発明の投写型表示装置は、光源と光変調部との間に光源の放射光束に対応する光量を検出する光量検出部を配置し、投写映像に必要とする明るさに対応して設定された明るさレベルと光量検出部の検出レベルとを比較してレベル差に応じた調光レベルで光源の点灯電力を調節するので、光源の放射光束のばらつきに起因する映像光の明るさのばらつきが低減される効果がある。
【００５５】
さらに、複数の投写型表示装置の画面を近接もしくは密着して配列構成するマルチ画面用途では、それぞれの投写型表示装置が投写する映像の明るさのばらつきが抑えられるので、複数の投写型表示装置の画面にまたがる映像の明るさが画面の接続部分で不連続とならず、良好な視認性や画質が得られる効果がある。
【図面の簡単な説明】
【図１】実施の形態１を示す図で、投写型表示装置の構成図である。
【図２】実施の形態２を示す図で、投写型表示装置の構成図である。
【図３】実施の形態３を示す図で、波長変換導光素子の原理図である。
【図４】実施の形態３を示す図で、第１の光量検出部の構成図である。
【図５】実施の形態４を示す図で、第２の光量検出部の構成図である。
【図６】実施の形態８を示す図で、第１の波長変換導光素子の斜視図である。
【図７】実施の形態９を示す図で、第２の波長変換導光素子の斜視図である。
【図８】従来の投写型表示装置の構成図である。
【符号の説明】
５アパチャー、６コンデンサレンズ、７ダイクロイックプリズム、８投写レンズ、１０光源部、１１発光管、１５凹面反射鏡、２５調光点灯装置、２６明るさ比較部、２７明るさ設定部、３０光量検出部、３１第１の波長変換導光素子、３２第２の波長変換導光素子、３３反射面、３６波長変換導光素子、３７透光性材料、３８波長変換体、３９光量センサー、４１赤色分離用ダイクロイックミラー、４２緑色分離用ダイクロイックミラー、４３第２ミラー、４６第１ミラー、４８第３ミラー、５１赤色用光変調素子、５２緑色用光変調素子、５３青色用光変調素子。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projection display device that enlarges and projects an image obtained by optically modulating light from a light source in accordance with image information using a light modulation element.
[0002]
[Prior art]
FIG. 8 is a configuration diagram of a conventional projection display device. In the figure, the light source unit 10 is configured by aligning the central axis of the arc tube 11 and the optical axis of the concave reflecting mirror 15 inside the concave reflecting mirror 15. The lighting device 21 supplies power to the arc tube 11. The condenser lens 6 condenses the light beam emitted from the light source unit 10. The red separating dichroic mirror 41 reflects the red component of the light beam transmitted through the condenser lens 6 and transmits the green and blue components. The green separating dichroic mirror 42 reflects the green components of the green and blue light components transmitted through the red separating dichroic mirror 41 and transmits the blue component. The second mirror 43 reflects the blue component light transmitted through the green separation dichroic mirror 42. The first mirror 46 reflects the red component light separated by the red separation dichroic mirror 41. The third mirror 48 reflects the reflected light of the second mirror 43.
[0003]
The dichroic mirror 41 for red separation, the dichroic mirror 41, the dichroic mirror 42 for green separation, the first mirror 46, the second mirror 43, and the third mirror 48 constitute a color separation unit.
[0004]
The red light modulation element 51 optically modulates the red light reflected by the first mirror 46 of the color separation unit according to video information. The green light modulation element 52 optically modulates the green light reflected by the green separation dichroic mirror 42 of the color separation unit according to video information. The blue light modulation element 53 optically modulates blue light reflected by the third mirror 48 of the color separation unit according to video information. The red light modulation element 51, the green light modulation element 52, and the blue light modulation element 53 constitute a light modulation unit.
[0005]
The dichroic prism 7 combines the light optically modulated by the red light modulation element 51, the green light modulation element 52, and the blue light modulation element 53 of the light modulation unit according to the video information. The projection lens 8 projects the light combined by the dichroic prism 7 onto the screen.
[0006]
Red, green, and blue light in which the light source unit 10, the condenser lens 6, the color separation unit, and the light modulation unit are arranged in this order to form an optical path, and the light beam emitted from the light source unit 10 is selectively separated by the color separation unit. Is optically modulated in accordance with the image information by the light modulation unit, and the image synthesized by the dichroic prism 7 is projected onto the screen by the projection lens 8.
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-296607
[Problems to be solved by the invention]
Since the conventional projection display device is configured as described above, the light source unit 10 is caused by variations in the luminous flux of the arc tube 11 and slight deviation between the optical axis of the concave reflecting mirror 15 and the central axis of the arc tube 11. There has been a problem that the brightness of the image projected on the screen varies due to variations in the emitted light flux.
[0009]
Also, in multi-screen applications where the screens of multiple projection display devices are arranged close to or in close contact with each other, if there is a variation in the brightness of the images projected by the respective projection display devices, There is a problem in that the brightness becomes discontinuous at the connection portion of the screen and the visibility and image quality are impaired.
[0010]
The present invention relates to a projection display device that enlarges and projects an image obtained by optically modulating light from a light source according to image information by a light modulation element onto a screen, and adjusting the brightness of the light source to a set level. Objective.
[0011]
[Means for Solving the Problems]
The projection display device according to the present invention includes a light source and light modulation in a projection display device that enlarges and projects image light obtained by optically modulating a light beam emitted from a light source according to image information by a light modulation unit. A light amount detection unit that is disposed between the light source and detects a light amount corresponding to the radiated light flux of the light source, a brightness setting unit that sets a brightness level corresponding to the brightness required for the projected image, and a light amount detection unit The brightness comparison unit that compares the detection level with the brightness level of the brightness setting unit and outputs the dimming level according to the level difference, and adjusts the lighting power of the light source with the dimming level from the brightness comparison unit And a dimming / lighting device.
[0012]
The projection display device according to the present invention is characterized in that an aperture for restricting the effective light beam range is provided between the light source and the light amount detection unit.
[0013]
Further, in the projection display device according to the present invention, the light quantity detection unit includes a first wavelength conversion light guide element and a light quantity sensor each having a wavelength conversion body contained in a translucent material and adjacent surfaces orthogonal to each other. And a light amount sensor is attached to a surface orthogonal to the light incident surface and the opposing light emitting surface of the first wavelength conversion light guide element.
[0014]
Further, in the projection display device according to the present invention, the light amount detection unit includes a first wavelength conversion light-guiding element having a flat plate shape in which a wavelength converter is contained in a light-transmitting material and adjacent surfaces are orthogonal to each other; The second wavelength conversion light guide element having a rectangular parallelepiped shape in which the wavelength converter is contained in the active material and adjacent surfaces are orthogonal to each other, and a light quantity sensor, and the light incident surface of the first wavelength conversion light guide element is opposed to each other. The second wavelength conversion light guide element is disposed so as to face a surface other than the light emission surface, and a light amount sensor is attached to the second wavelength conversion light guide element.
[0015]
In the projection display device according to the present invention, the wavelength conversion light-guiding element is formed by containing a wavelength converter of rare earth ions in translucent glass.
[0016]
Further, the projection display device according to the present invention is characterized in that the wavelength conversion light guide element is formed by containing a wavelength conversion body of a phosphor in a translucent resin.
[0017]
In the projection display device according to the present invention, the second wavelength converter contained in the second wavelength conversion light guide element is an emission wavelength of the first wavelength converter contained in the first wavelength conversion light guide element. It emits light when excited.
[0018]
In the projection display device according to the present invention, the first wavelength conversion light guide element faces the light incident surface, the light emitting surface, and the light amount sensor mounting surface or the light amount sensor mounting surface. The surface excluding the portion to be made is a reflective surface.
[0019]
In the projection display device according to the present invention, the first wavelength conversion light guide element is a surface on which the light incident surface, the light emission surface, and the second wavelength conversion light guide element are arranged in close contact with each other. The second wavelength conversion light guide element faces the first wavelength conversion light guide element and the light quantity sensor mounting surface or the light quantity sensor mounting surface. The surface excluding the portion to be made is a reflective surface.
[0020]
The projection display device according to the present invention is characterized in that the reflection surface of the wavelength conversion light guide element has an outer surface as a low reflectance surface.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a diagram showing the first embodiment and is a configuration diagram of a projection display device.
The color separation unit, the light modulation unit, the dichroic prism 7 and the projection lens 8 are the same as the conventional ones, and a description thereof will be omitted.
[0022]
As shown in FIG. 1, a light amount detection unit 30 that detects a light amount corresponding to the emitted light beam of the light source unit 10 is disposed between the light source unit 10 and the condenser lens 6. A brightness setting unit 27 for setting a brightness level corresponding to the brightness of the projected image is provided. A brightness comparison unit 26 that compares the detection level of the light amount detection unit 30 with the brightness level of the brightness setting unit 27 and outputs a dimming level is provided. A dimming / lighting device 25 that adjusts the lighting power of the arc tube 11 at the dimming level output by the brightness comparison unit 26 is disposed.
[0023]
When the light intensity level detected by the light intensity detection unit 30 is higher than the brightness level set in the brightness setting unit 27, the brightness comparison unit 26 informs the dimming lighting device 25 of the difference between the light amount level and the brightness level. In response, a light control level signal for reducing the light quantity is output, and when the light quantity level detected by the light quantity detection unit 30 is lower than the brightness level set in the brightness setting unit 27, the light quantity is supplied to the dimming lighting device 25. A light control level signal that increases the amount of light corresponding to the difference between the level and the brightness level is output.
[0024]
The dimming / lighting device 25 increases / decreases the lighting power of the arc tube 11 of the light source unit 10 according to the dimming level signal from the brightness comparison unit 26, and displays an image with the brightness set in the brightness setting unit 27. To do.
[0025]
Although the example in which the light quantity detection unit 30 is arranged between the light source unit 10 and the condenser lens 6 has been shown, it may be arranged in the optical path from the light source unit 10 to the light modulation unit.
[0026]
According to the above-described embodiment, the light amount detection unit 30 that detects the amount of light corresponding to the radiated light beam of the light source is disposed between the light source unit 10 and the condenser lens 6, and corresponds to the brightness required for the projected image. Since the set brightness level and the detection level of the light amount detection unit 30 are compared and the lighting power of the light source is adjusted at a dimming level according to the level difference, the brightness of the image light due to the variation in the luminous flux of the light source This has the effect of reducing the variation in thickness.
[0027]
Furthermore, in a multi-screen application in which the screens of a plurality of projection display devices are arranged close to or in close contact with each other, variation in the brightness of the image projected by each projection display device can be suppressed. The brightness of the video over the screen is not discontinuous at the connecting portion of the screen, and there is an effect that good visibility and image quality can be obtained.
[0028]
Embodiment 2. FIG.
FIG. 2 is a diagram illustrating the second embodiment and is a configuration diagram of a projection display device.
As shown in the figure, an aperture 5 is provided between the light source unit 10 and the light amount detection unit 30 to regulate the range of the effective luminous flux. Since the aperture 5 allows only an effective light beam suitable for image display to pass among light beams emitted from the light source unit 10, the light source unit that performs light control with the light control lighting device 25 based on the detection level of the light amount detection unit 30. The increase / decrease in the amount of light 10 corresponds to the brightness of the display, and the brightness of the video display can be matched with the brightness level set in the brightness setting unit 27.
[0029]
In multi-screen applications in which the screens of multiple projection display devices are arranged close together or closely, the brightness of the images projected by each projection display device is the same, and the brightness of the images across multiple screens is the same. Since it changes continuously at the connection part of the screen, the problem of impairing visibility and image quality is eliminated.
[0030]
Embodiment 3 FIG.
3 and 4 are diagrams showing Embodiment 3, FIG. 3 is a principle diagram of the wavelength conversion light-guiding element, and FIG. 4 is a configuration diagram of a first light quantity detection unit.
In FIG. 3, the wavelength conversion light guide element 36 is a wavelength converter 38 that emits light having a wavelength different from that of the irradiated light by being excited by the light irradiated on the light transmissive material 37 such as glass or resin. Formed. The wavelength conversion light guide element 36 has a structure in which a translucent material 37 containing a wavelength conversion body 38 is formed in a flat plate shape or a rectangular parallelepiped shape whose adjacent surfaces are orthogonal to each other.
[0031]
The excitation light is emitted in all directions through the wavelength conversion light guide element 36 and reaches the end face of a flat surface or a rectangular parallelepiped, and is emitted outside the wavelength conversion light guide element 36 according to the refractive index of the translucent material 37. Or totally reflected toward the other surface of the wavelength conversion light guide element 36.
[0032]
The totally reflected light repeats external radiation and total reflection again at the end face of the wavelength conversion light guide element 36, so that the excitation light is emitted to the outside from all the end faces of the flat surface and the rectangular parallelepiped.
[0033]
Since the adjacent surfaces of the wavelength conversion light-guiding element 36 are formed in a flat plate shape or a rectangular parallelepiped shape, incident light is radiated to the outside from the incident surface and the opposite exit surface. Incident light that reaches the orthogonal surface is totally reflected, and is not radiated to the outside from the surface orthogonal to the incident surface and the output surface.
[0034]
As described above, the wavelength conversion light-guiding element 36 having a structure in which the wavelength conversion body 38 is included in the translucent material 37 and the adjacent surfaces are formed in a flat plate shape or a rectangular parallelepiped shape is proportional to the amount of incident light. Since the light emitted from the wavelength converter 38 thus excited is radiated to the outside from the plane orthogonal to the incident plane and the outgoing plane, the amount of light radiated to the outside can be detected on the plane.
[0035]
As shown in FIG. 4, the light amount detection unit 30 includes a flat plate-shaped first wavelength conversion light guide element 31 and a light amount sensor 39 which include a wavelength converter in a translucent material and adjacent surfaces are orthogonal to each other. The light quantity sensor 39 is attached to one of the surfaces of the first wavelength conversion light guide element 31 that are orthogonal to the light incident surface and the opposite light exit surface.
[0036]
Since the wavelength converter is excited by the light beam emitted from the light source unit 10 incident on the first wavelength conversion light guide element 36 and emits light, the light amount detection unit 30 has a surface orthogonal to the light incident surface and the opposite exit surface. One light amount sensor 39 can be attached to detect the light amount proportional to the luminous flux emitted from the light source unit 10.
[0037]
Although the light quantity sensor 39 is shown attached to one of the surfaces orthogonal to the light incident surface and the opposite exit surface of the first wavelength conversion light guide element 36, the light incident surface and the opposite exit surface are shown. It may be attached to a plurality of orthogonal surfaces.
[0038]
Embodiment 4 FIG.
FIG. 5 is a diagram showing the fourth embodiment, and is a configuration diagram of the second light quantity detection unit.
As shown in the figure, the light quantity detection unit 30 includes a first wavelength conversion light guide element 31 having a wavelength converter in a translucent material and adjacent surfaces orthogonal to each other, and a wavelength in the translucent material. It is composed of a rectangular parallelepiped second wavelength conversion light-guiding element 32 containing a converter and adjacent surfaces orthogonal to each other, and a light amount sensor 39. One of the long sides of the second wavelength conversion light-guiding element 32 is adjacent to one of the surfaces orthogonal to the light incident surface and the opposite emission surface of the first wavelength conversion light-guiding element 31. The light quantity sensor 39 is attached to one of the short sides of the second wavelength conversion light guide element 32.
[0039]
One of the long sides of the second wavelength conversion light-guiding element 32 is adjacent to one of the surfaces orthogonal to the light incident surface and the opposite emission surface of the first wavelength conversion light-guiding element 31. However, what is necessary is just to arrange | position the 2nd wavelength conversion light guide element 32 in the surface orthogonal to the incident surface of the light in the 1st wavelength conversion light guide element 31, and the output surface which opposes.
[0040]
In addition, although the light amount sensor 39 is attached to one of the short sides of the second wavelength conversion light guide element 32, the light amount sensor 39 may be attached to the second wavelength conversion light guide element 32. Any structure can be used.
[0041]
The excitation light emission of the wavelength converter contained in the first wavelength conversion light guide element 31 is received by one of the long sides of the second wavelength conversion light guide element 32, and the second wavelength conversion guide is received by the received incident light. Since the wavelength converter contained in the optical element 32 is excited to emit light and detected by the light amount sensor 39 provided on one of the short sides of the rectangular parallelepiped, the first wavelength conversion light guide element 31 and the second wavelength conversion light guide The excitation light emission of the wavelength converter radiated from the element 32 can be efficiently guided to the light quantity sensor 39, and the detection accuracy of the light flux emitted from the light source unit 10 is improved.
[0042]
Embodiment 5 FIG.
The 1st wavelength conversion light guide element 31 and the 2nd wavelength conversion light guide element 32 contain the wavelength converter of rare earth ions in translucent glass, and are formed. Since the 1st wavelength conversion light guide element 31 and the 2nd wavelength conversion light guide element 32 are translucent glass, they can be arrange | positioned also in the high temperature part which adjoins the light source part 10. FIG.
[0043]
Embodiment 6 FIG.
The 1st wavelength conversion light guide element 31 and the 2nd wavelength conversion light guide element 32 contain the wavelength conversion body of a fluorescent substance in translucent resin, and are formed. Since the first wavelength conversion light guide element 31 and the second wavelength conversion light guide element 32 are translucent resins, they can be formed at a relatively low temperature.
[0044]
Embodiment 7 FIG.
The second wavelength conversion body contained in the second wavelength conversion light guide element 32 is a wavelength conversion body that emits light when excited by the emission wavelength of the first wavelength conversion body contained in the first wavelength conversion light guide element 31. .
[0045]
Since the wavelength converter has a different emission wavelength from the wavelength of the excitation light, the first wavelength conversion light guide element 31 contains the excitation wavelength of the second wavelength conversion material contained in the second wavelength conversion light guide element 32. Assuming that the wavelength matches or approximates the emission wavelength of the wavelength converter, the second wavelength is emitted by the first wavelength converter of the first wavelength conversion light guide element 31 excited by the incident light of the light beam emitted from the light source unit 10. The second wavelength converter of the wavelength conversion light guide element 32 can be excited and emitted efficiently.
[0046]
Embodiment 8 FIG.
FIG. 6 is a diagram showing the eighth embodiment, and is a perspective view of the first wavelength conversion light-guiding element. As shown in the figure, the first wavelength conversion light guide element 31 reflects a surface excluding the incident surface of the light beam emitted from the light source unit 10, the exit surface facing the incident surface, and the mounting surface of the light quantity sensor 39. The structure is a surface 33.
[0047]
In addition, the mounting surface of the light quantity sensor 39 may be a reflection surface 33 except for a portion facing the light quantity sensor 39.
[0048]
Since the light emitted from the first wavelength converter is radiated to the outside from all surfaces of the first wavelength conversion light-guiding element 31, the incident surface of the light beam emitted from the light source unit 10, the exit surface facing the entrance surface, and a light quantity sensor If the reflection surface 33 is a surface excluding the attachment surface 39 or the portion facing the light amount sensor 39, the light emitted from the first wavelength converter can be efficiently guided to the light amount sensor 39.
[0049]
Embodiment 9 FIG.
FIG. 7 is a diagram showing the ninth embodiment, and is a perspective view of a second wavelength conversion light guide element. As shown in the figure, the first wavelength conversion light guide element 31 has an incident surface of a light beam emitted from the light source unit 10, an output surface opposite to the incident surface, and a second wavelength conversion light guide element 32. The second wavelength conversion light-guiding element 32 is a light amount sensor on the surface facing the first wavelength conversion light-guiding element 31 and the mounting surface of the light amount sensor 39. In this structure, the surface excluding the portion facing 39 is a reflecting surface 33.
[0050]
Further, the second wavelength conversion light guide element 32 may have a structure in which a surface excluding a surface facing the first wavelength conversion light guide element 31 and a mounting surface of the light quantity sensor 39 is a reflection surface 33.
[0051]
Except the incident surface of the light beam emitted from the light source unit 10 of the first wavelength conversion light guide element 31, the emission surface opposite to the incident surface, and the surface where the second wavelength conversion light guide element 32 is disposed in proximity. The surface is a reflection surface 33, and the surface of the second wavelength conversion light-guiding element 32 excluding the surface facing the first wavelength conversion light-guiding element 31 and the portion facing the light quantity sensor 39 or the mounting surface of the light quantity sensor 39 Is the reflecting surface 33, the light emitted from the first wavelength converter can be efficiently guided to the light amount sensor 39.
[0052]
Embodiment 10 FIG.
The reflection surfaces 33 of the first wavelength conversion light guide element 31 and the second wavelength conversion light guide element 32 have a structure in which the outer surface is a low reflectance surface.
When the outer surface of the reflection surface 33 of the first wavelength conversion light guide element 31 and the second wavelength conversion light guide element 32 is a low reflectance surface, the first wavelength conversion light guide element 31 and the second wavelength conversion light guide are provided. It is possible to reduce unnecessary light that is reflected on the surface of the element 32 and is mixed in an optical path from the light source unit 10 to the light modulation unit and interferes with an image to be displayed.
[0053]
In the above-described embodiment, the projection type display device includes the color separation unit using the dichroic mirror, the light modulation unit of the three light modulation elements, and the dichroic prism. However, the present invention is not necessarily limited to this configuration. Also, a projection display device configured without using a color separation unit using a color filter, a light modulation unit with one light modulation element, and a dichroic prism may be used.
[0054]
【The invention's effect】
In the projection display device of the present invention, a light amount detection unit that detects a light amount corresponding to the radiated light beam of the light source is disposed between the light source and the light modulation unit, and is set according to the brightness required for the projected image. The brightness level of the light source and the detection level of the light intensity detector are compared, and the lighting power of the light source is adjusted at a dimming level according to the level difference. Is effective.
[0055]
Furthermore, in a multi-screen application in which the screens of a plurality of projection display devices are arranged close to or in close contact with each other, variation in the brightness of the image projected by each projection display device can be suppressed. The brightness of the video over the screen is not discontinuous at the connecting portion of the screen, and there is an effect that good visibility and image quality can be obtained.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a first embodiment and is a configuration diagram of a projection display device.
FIG. 2 is a diagram illustrating a second embodiment and is a configuration diagram of a projection display device.
FIG. 3 is a diagram illustrating a third embodiment and is a principle diagram of a wavelength conversion light guide element;
FIG. 4 is a diagram illustrating the third embodiment and is a configuration diagram of a first light quantity detection unit;
FIG. 5 is a diagram illustrating the fourth embodiment and is a configuration diagram of a second light quantity detection unit;
FIG. 6 is a diagram illustrating the eighth embodiment, and is a perspective view of a first wavelength conversion light-guiding element.
7 shows the ninth embodiment and is a perspective view of a second wavelength conversion light-guiding element. FIG.
FIG. 8 is a configuration diagram of a conventional projection display device.
[Explanation of symbols]
5 Aperture, 6 Condenser lens, 7 Dichroic prism, 8 Projection lens, 10 Light source unit, 11 Luminescent tube, 15 Concave reflector, 25 Dimming / lighting device, 26 Brightness comparison unit, 27 Brightness setting unit, 30 Light quantity detection unit , 31 First wavelength conversion light guide element, 32 Second wavelength conversion light guide element, 33 Reflecting surface, 36 Wavelength conversion light guide element, 37 Translucent material, 38 Wavelength conversion body, 39 Light quantity sensor, 41 Red separation Dichroic mirror for 42, dichroic mirror for green separation, 43 second mirror, 46 first mirror, 48 third mirror, 51 light modulation element for red, 52 light modulation element for green, 53 light modulation element for blue.

Claims

In a projection display device that enlarges and projects image light, which is obtained by optically modulating a light beam emitted from a light source according to image information by a light modulation unit, on a screen,
A light amount detection unit that is disposed between the light source and the light modulation unit and detects a light amount corresponding to a radiated light beam of the light source;
A brightness setting section for setting a brightness level corresponding to the brightness required for the projected image;
A brightness comparison unit that compares the detection level of the light amount detection unit and the brightness level of the brightness setting unit and outputs a dimming level according to a level difference;
A dimming lighting device that adjusts the lighting power of the light source at a dimming level from the brightness comparison unit;
With
The light amount detection unit includes a first wavelength conversion light guide element and a light amount sensor that include a wavelength converter in a translucent material and have adjacent surfaces orthogonal to each other, and the first wavelength conversion light guide. A projection display apparatus, wherein the light quantity sensor is attached to a surface orthogonal to a light incident surface and a light emitting surface facing the element.

In a projection display device that projects an image light that is optically modulated by a light modulation unit in accordance with image information on a light beam emitted from a light source on a screen,
  A light amount detection unit that is disposed between the light source and the light modulation unit and detects a light amount corresponding to a radiated light beam of the light source;
  A brightness setting section for setting a brightness level corresponding to the brightness required for the projected image;
  A brightness comparison unit that compares the detection level of the light amount detection unit with the brightness level of the brightness setting unit and outputs a dimming level according to a level difference;
  A dimming lighting device that adjusts the lighting power of the light source at a dimming level from the brightness comparison unit;
With
The light quantity detecting unit includes a wavelength-converting material in a light-transmitting material and has a flat plate-shaped first wavelength conversion light-guiding element whose adjacent surfaces are orthogonal to each other, and a light-transmitting material that includes a wavelength converting material and is adjacent. A rectangular parallelepiped second wavelength conversion light-guiding element whose surfaces are orthogonal to each other and a light quantity sensor, and the second wavelength conversion light-guiding element of the first wavelength conversion light-guiding element is arranged on the surface other than the light incident surface and the opposing light exit surface. A projection display device, wherein the wavelength conversion light guide elements are arranged so as to face each other, and the light quantity sensor is attached to the second wavelength conversion light guide element.

The projection display device according to claim 1 or claim 2, characterized in that a aperture for restricting the range of the effective light beam between the light source and the light quantity detecting section.

4. The projection display device according to claim 1, wherein the wavelength conversion light-guiding element is formed by containing a wavelength converter of rare earth ions in translucent glass. 5.

The wavelength conversion light element, a projection display device according to any one of claims 1 to 3, characterized in that formed by containing a wavelength conversion material of the phosphor to the light transmitting resin.

The second wavelength conversion body contained in the second wavelength conversion light guide element is excited by the emission wavelength of the first wavelength conversion body contained in the first wavelength conversion light guide element to emit light. The projection display device according to claim 2 .

The first wavelength conversion light guide element excludes the light incident surface, the light emission surface, and the light sensor mounting surface or a portion of the light sensor mounting surface facing the light sensor. The projection display device according to claim 1, wherein the surface is a reflective surface.

The first wavelength conversion light-guiding element has a reflection surface that is a surface excluding the light incident surface, the light emission surface, and the surface on which the second wavelength conversion light-guiding element is closely attached. The second wavelength conversion light guide element has a surface facing the first wavelength conversion light guide element, and a mounting surface of the light amount sensor or a portion of the mounting surface of the light amount sensor facing the light amount sensor. The projection display device according to claim 2 , wherein the removed surface is a reflection surface.

The projection display device according to claim 7 or 8, wherein the reflection surface of the wavelength conversion light guide element has an outer surface as a low reflectance surface.