JP2004226716A - Optical modulator unit and projection type display device - Google Patents

Optical modulator unit and projection type display device Download PDF

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Publication number
JP2004226716A
JP2004226716A JP2003014821A JP2003014821A JP2004226716A JP 2004226716 A JP2004226716 A JP 2004226716A JP 2003014821 A JP2003014821 A JP 2003014821A JP 2003014821 A JP2003014821 A JP 2003014821A JP 2004226716 A JP2004226716 A JP 2004226716A
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polarizing plate
modulation element
light modulation
incident
side polarizing
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JP2003014821A
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Japanese (ja)
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Sadahisa Aiko
禎久 愛甲
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Sony Corp
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Sony Corp
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Priority to JP2003014821A priority Critical patent/JP2004226716A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical modulator unit advantageous in reduction of assembling cost and to provide a projection type display device. <P>SOLUTION: The optical modulator unit 10 is provided with an incidence side polarizing plate 12, an emission side polarizing plate 14, a transmission type optical modulator 16, a parting member 30 and two mounting members 40. The transmission type optical modulator 16 is mounted on the parting member 30 to assemble a parting member integrated type transmission type optical modulator 16A. The both side parts of the incidence side polarizing plate 12, the parting member integrated type transmission type optical modulator 16A and the emission side polarizing plate 14 are housed in and adhesively stuck to, by using an adhesive, an incidence side polarizing plate housing recessed part 42, a transmission type optical modulator housing recessed part 46 and an emission side polarizing plate housing recessed part 44 of the mounting members 40, respectively. The incidence side polarizing plate 12 and the emission side polarizing plate 14 are disposed so as to be opposed to a light incidence surface 1602 at an interval D1 and a light emission surface 1604 at an interval D2, respectively. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は光変調素子ユニットおよび投射型表示装置に関する。
【０００２】
【従来の技術】
映像信号に基づいて光源からの光を透過型光変調素子を用いて光変調し、該光変調された光をスクリーンなどに投射することで画像を形成する投射型表示装置が提供されている（特許文献１）。
前記透過型光変調素子は、例えば石英ガラスなどからなる透明基板の間に液晶が封入されて構成されており、前記液晶が前記映像信号に基づいて駆動されることによって映像の表示を行ない、前記映像が表示されている液晶に光源からの光を透過させることによって前記光変調を行なって映像の像を形成するものである。
前記透過型光変調素子は接着剤によって、例えばアルミ材料から構成されるフレームに固定され、該フレームを介して前記投射型表示装置の光学部材に対して位置決めされ、光学部材側に取着されている。
また、透過型光変調素子の入射側および出射側には、入射側偏光板および出射側偏光板がそれぞれ設けられ、これら入射側偏光板および出射側偏光板は前記投射型表示装置の光学部材に対して前記透過型光変調素子とは別に位置決めされ、前記光学部材側に取着されている。
【０００３】
【特許文献１】
特開２０００−１８０９５８号公報
【０００４】
【発明が解決しようとする課題】
しかしながら、このように透過型光変調素子、入射側偏光板および出射側偏光板を光学部材側に対して個別に位置決めし、取着する構成では、これら透過型光変調素子、入射側偏光板および出射側偏光板相互の位置決め作業が面倒で手間がかかり、組み立てコストを削減する上で不利があった。
本発明は前記事情に鑑み案出されたものであって、その目的とするところは、組み立てコストを削減する上で有利な光変調ユニット及び投射型表示装置を提供することにある。
【０００５】
【課題を解決するための手段】
本発明は前記目的を達成するため、本発明の光変調素子ユニットは、板状を呈し厚さ方向の一方に光が入射する光入射面が形成され、厚さ方向の他方に前記入射した光が出射する光出射面が形成された矩形板状の透過型光変調素子と、矩形板状の入射側偏光板と、矩形板状の出射側偏光板と、２つの取付部材とを備え、前記透過型光変調素子の前記光入射面に前記入射側偏光板が隙間を空けて対向し、かつ、前記透過型光変調素子の前記光出射面に前記出射側偏光板が隙間を空けて対向した状態で、これら入射側偏光板、透過型光変調素子、出射側偏光板の両側の辺部分がそれぞれ前記取付部材に取着されていることを特徴とする。
また、本発明の投射型表示装置は、光源からの光を光変調素子ユニットにより映像信号に基づいて光変調することにより映像を形成し、前記光変調素子ユニットにより形成された前記映像を投射する投射型表示装置において、前記光変調素子ユニットは、状を呈し厚さ方向の一方に光が入射する光入射面が形成され、厚さ方向の他方に前記入射した光が出射する光出射面が形成された矩形板状の透過型光変調素子と、矩形板状の入射側偏光板と、矩形板状の出射側偏光板と、２つの取付部材とを備え、前記透過型光変調素子の前記光入射面に前記入射側偏光板が隙間を空けて対向し、かつ、前記透過型光変調素子の前記光出射面に前記出射側偏光板が隙間を空けて対向した状態で、これら入射側偏光板、透過型光変調素子、出射側偏光板の両側の辺部分がそれぞれ前記取付部材に取着されていることを特徴とする。
そのため、本発明の光変調素子ユニットおよび投射型表示装置によれば、取付部材により透過型光変調素子、入射側偏光板および出射側偏光板を相互に位置決めした状態で、光学部材に取り付ける以前に、予め組み立てることができる。
【０００６】
【発明の実施の形態】
次に、本発明の実施の形態について図面を参照して説明する。
図１は本発明の第１の実施の形態の投射型表示装置の構成を示す構成図である。
投射型表示装置１００は筐体１０２を有し、該筐体１０２内に本発明に係る３つの光変調素子ユニット１０Ａ、１０Ｂ、１０Ｃが配設されている。
これら３つの光変調素子ユニット１０Ａ、１０Ｂ、１０Ｃは、図外の映像信号供給器、例えば、テレビジョンチューナ装置、ビデオテーププレーヤ装置、ビデオディスクプレーヤ装置などから制御回路を介して映像信号が供給され、この映像信号に基づいて映像を表示するように構成されている。
前記各光変調素子ユニット１０Ａ、１０Ｂ、１０Ｃは、透過型の光変調素子を有し、透過率の変化（濃淡）によって映像を表示する。前記３つの光変調素子ユニットのうち、光変調素子ユニット１０Ａは前記映像信号に対応する映像の赤色成分を表示し、光変調素子ユニット１０Ｂは前記映像信号に対応する映像の緑成分を表示し、光変調素子ユニット１０Ｃは前記映像信号に対応する映像の青色成分を表示する。
【０００７】
さらに、前記筐体１０２内には、光源１０４、ＵＶフィルタ１０６、マルチレンズアレイ１０８、１１０、コンデンサレンズ１１２、第１のダイクロイックミラー１１４Ａ、第２のダイクロイックミラー１１４Ｂ、第１乃至第３のコンデンサーレンズ１１６Ａ、１１６Ｂ、１１６Ｃ、第１、第２の集光レンズ１１８、１２０、クロスダイクロイックプリズム１２２、投射レンズ１２４などが配設されている。
前記光源１０４はハロゲンランプのような高輝度の白色ランプで構成され、該光源１０４から出射された光束は、前記ＵＶフィルタ１０６、マルチレンズアレイ１０８、１１０を順次透過し、該光束に対して４５度傾斜して配設された前記第１のダイクロイックミラー１１４Ａに入射する。
前記第１のダイクロイックミラー１１４Ａは、前記光束のうち赤色成分光Ｒのみを反射して９０度偏向させ、前記光束のうち緑色成分光Ｇと青色成分光Ｂを透過させる。
前記第１のダイクロイックミラー１１４Ａにより反射された赤色成分光Ｒは、第１のミラー１２６Ａによって反射され９０度偏向され、第１のコンデンサーレンズ１１６Ａ、前記光変調ユニット１０Ａを順次透過してクロスダイクロイックプリズム１２２の一側面部１２２Ａに入射する。
【０００８】
前記第１のダイクロイックミラー１１４Ａを透過した緑色成分光Ｇおよび青色成分光Ｂは、これら緑色成分光Ｇおよび青色成分光Ｂの光束に対して４５度傾斜して配設された前記第２のダイクロイックミラー１１４Ｂに入射する。この第２のダイクロイックミラー１１４Ｂは、前記緑色成分光Ｇおよび青色成分光Ｂのうち、緑色成分光Ｇのみを反射して９０度偏向させ、残りの青色成分光Ｂを透過させる。
前記第２のダイクロイックミラー１１４Ｂによって反射された緑色成分光Ｇは、前記第２のコンデンサーレンズ１１６Ｂ、前記光変調ユニット１０Ｂを順次透過してクロスダイクロイックプリズム１２２の後面部１２２Ｂに入射する。
【０００９】
前記第２のダイクロイックミラー１１４Ａを透過した青色成分光Ｂは、第１の集光レンズ１１８を透過し、該青色成分光Ｂの光束に対して４５度傾斜して配設された第２のミラー１２６Ｂに入射されて反射され９０度偏向される。
前記第２のミラー１２６Ｂによって反射された青色成分光Ｂは、第２の集光レンズ１２０を透過し、第３のミラー１２６Ｃにより反射され９０度偏向されコンデンサーレンズ１１６Ｃ、前記光変調ユニット１０Ｃを順次透過してクロスダイクロイックプリズム１２２の他側面部１２２Ｃに入射する。
なお、前記第１、第２の集光レンズ１１８、１２０は、前記光源１０から前記各光変調素子ユニット１０Ａ、１０Ｂ、１０Ｃに至る赤色成分光Ｒ、緑色成分光Ｇおよび青色成分光Ｂのそれぞれの光路長のうち、前記青色成分光Ｂの光路長が前記赤色成分光Ｒ、緑色成分光Ｇの光路長に比較して長いことにより青色成分光Ｂが拡散しやすいため、青色成分光Ｂを集束させるためのものである。
【００１０】
前記クロスダイクロイックプリズム１２２は、前記一側面部１２２Ａから入射された赤色成分光Ｒ、前記後面部１２２Ｂから入射された緑色成分光Ｇ、前記他側面部１２２Ｃから入射された青色成分光Ｂを合成して前面部１２２Ｄから出射するものである。本実施の形態では、前記クロスダイクロイックプリズム１２２は、色合成光学系としての光学部材を構成している。
前記クロスダイクロイックプリズム１２２の前面部１２２Ｄから出射された光束は、前記投射レンズ１２４に入射される。該投射レンズ１２４は、入射された光束を前記筐体１０２の前方に投射する。
すなわち、前記投射レンズ１２４は、前記各光変調素子ユニット１０Ａ、１０Ｂ、１０Ｃにより表示され前記光源１０４によって照明された映像の像を、前記筐体１０２の前方に設置されたスクリーン上に結像させる。
【００１１】
図２は光変調素子ユニットの構成を示す分解斜視図、図３は光変調素子ユニットの組立状態を示す斜視図、図４は取付部材の斜視図、図５は光変調素子ユニットの断面正面図、図６は光変調素子ユニットの取付状態を示す斜視図である。
図２に示すように、各光変調素子ユニット１０Ａ、１０Ｂ、１０Ｃは、それぞれ透過型光変調素子１６と、見切り部材３０と、入射側偏光板１２と、出射側偏光板１４と、２つの取付部材４０とを備えている。
なお、光変調素子ユニット１０Ａ、１０Ｂ、１０Ｃの構成はほぼ同様であるので以後光変調素子ユニット１０として説明する。
図５に示すように、前記透過型光変調素子１６は、ＴＦＴ基板１８、対向基板２０、第１防塵ガラス２２、第２防塵ガラス２４などが重ね合わされて平面視ほぼ長方形状に形成され、透過型光変調素子１６（ＴＦＴ基板１８）にはフレキシブル基板２６が連結されている。
前記ＴＦＴ基板１８は、長方形状に形成された透明基板から構成され、該透明基板の上面中央には透明電極が矩形状の領域に形成され、前記上面の透明電極の周囲には液晶駆動用回路が形成されている。
【００１２】
前記対向基板２０は、前記ＴＦＴ基板１８よりも縦横の寸法が若干小さい透明基板から構成されている。前記対向基板２０は、該対向基板２０の四辺と前記ＴＦＴ基板１８の四辺をそれぞれ平行させ、かつ、前記ＴＦＴ基板１８の透明電極に対向して配設され、前記対向基板２０と前記ＴＦＴ基板１８との間に液晶が封止されている。
そして、前記液晶によって矩形状の輪郭を有した映像表示領域が形成されるように構成されている。
【００１３】
前記第１防塵ガラス２２は前記対向基板２０よりも縦横の寸法が若干小さい透明基板から構成されている。前記第１防塵ガラス２２は、該第１防塵ガラス２２の四辺と前記対向基板２０の四辺をそれぞれ平行させ、かつ、前記対向基板２０の上面に重ね合わせて配設され、接着剤によって接着されている。
【００１４】
前記第２防塵ガラス２４は前記ＴＦＴ基板１８よりも縦横の寸法が若干小さい透明基板から構成されている。前記第２防塵ガラス２４は、該第２防塵ガラス２４の四辺と前記ＴＦＴ基板１８の四辺をそれぞれ平行させ、かつ、前記ＴＦＴ基板１８の下面に重ね合わせて配設され、接着剤によって接着されている。
【００１５】
したがって、本実施の形態では、前記第１防塵ガラス２２の上面が、前記透過型光変調素子１６の厚さ方向の一方に位置し前記光源１０４からの光を入射する光入射面１６０２を構成している。
また、前記第２防塵ガラス２４の下面が、前記透過型光変調素子１６の厚さ方向の他方に位置し前記光入射面１６０２に入射した光が出射する光出射面１６０４を構成している。
また、前記ＴＦＴ基板１８と対向基板２０の間に封止された液晶は、前記透過型光変調素子１６の対向する短辺１６０６のうち一方を基準辺１６０６Ａとしたときに、その光入射側の透過軸および光出射側の透過軸の一方が前記基準辺１６０６Ａと平行し、かつ、光入射側の透過軸および光出射側の透過軸の他方が前記基準辺１６０６Ａと直交するように構成されている。
本実施の形態では、前記液晶の光入射側の透過軸１６０８が前記基準辺１６０６Ａと平行し、かつ、前記液晶の光出射側の透過軸１６１０が前記基準辺１６０６Ａと直交するように構成されている。
なお、本実施の形態では、前記基準辺１６０６Ａは前記ＴＦＴ基板１８の端面１８０２によって構成され、前記ＴＦＴ基板１８、対向基板２０、第１、第２防塵ガラス２２、２４は石英ガラスで構成されている。
【００１６】
前記フレキシブル基板２６は、図１に示すように、帯状に形成されその長手方向の両端に複数の接続端子が設けられている。フレキシブル基板２６の一端側の接続端子は前記ＴＦＴ基板１８に設けられた前記液晶駆動用回路の接続端子に接続され、フレキシブル基板２６の他端側の接続端子は外部回路に接続されている。そして、前記外部回路から液晶駆動信号が前記フレキシブル基板２６を介して前記液晶駆動用回路に供給される。
そして、前記液晶駆動信号に基づいて前記ＴＦＴ基板１８と対向基板２０の間に封止された液晶が駆動されることにより映像が表示されることになる。
【００１７】
前記見切り部材３０は、図２に示すように、入射窓３４が形成された長方形の入射側見切り板３２と、出射窓３８が形成され前記入射側見切り板３２に対向する長方形の出射側見切り板３６と、これら見切り板３２、３６を連結する連結板３９とを有し、平面視ほぼ長方形状を呈している。
前記入射側見切り板３２と出射側見切り板３６とは互いに平行をなすように設けられ、前記入射側見切り板３２の下面から出射側見切り板３６の上面までの寸法は、前記透過型光変調素子１６の厚さよりも若干大きな値となっている。
前記入射側見切り板３２は、前記入射窓３４によって光変調素子ユニット１６の光入射面１６０２を透過する光束の透過領域を制限することで不要な光が光変調素子ユニット１６の光入射面１６０２に入射したり、該光入射面１６０２から反射したりすることを防止するものである。
前記出射側見切り板３６は、前記出射窓３８によって光変調素子ユニット１６の光出射面１６０４を透過する光束の透過領域を制限することで不要な光が光変調素子ユニット１６の光出射面１６０４に入射したり、該光出射面１６０２から反射したりすることを防止するものである。
前記見切り部材３０は、光を透過しない例えば金属などの材料で形成され、本実施の形態ではアルミやステンレスの薄い板材によって形成されている。
【００１８】
入射側偏光板１２は、長方形の板状に形成され、互いに対向する短辺１２０２の一方を基準辺１２０２Ａとして該基準辺１２０２Ａに対してその偏光軸１２０４が平行または直交の一方をなすように構成されている。本実施の形態では、基準辺１２０２Ａに対して前記偏光軸１２０４が平行をなすように構成されている。
出射側偏光板１４は、長方形の板状に形成され、互いに対向する短辺１４０２の一方を基準辺１４０２Ａとして該基準辺１４０２Ａに対してその偏光軸１４０４が平行また直交の他方をなすように構成されている。本実施の形態では、基準辺１４０２Ａに対して前記偏光軸１４０４が直交をなすように構成されている。
【００１９】
前記２つの取付部材４０は、図２、図４に示すように、直線状に延在するブロック状に形成され、その側面には、前記入射側偏光板１２、前記透過型光変調素子１６、前記出射側偏光板１４をそれぞれ収容する入射側偏光板収容凹部４２、透過型光変調素子収容凹部４６、出射側偏光板収容凹部４４が細長形状に形成されている。
図２、図５に示すように、前記透過型光変調素子収容凹部４６は、前記見切り部材３０が取着された状態の透過型光変調素子１６の厚さに対応した幅を形成するように互いに対向する２つの側面４６０２と、前記見切り部材３０が取着された状態の透過型光変調素子１６の短辺に対応した長さを形成するように互いに対向する２つの端面４６０４と、深さ方向の底部に位置する底面４６０６とを有し、前記透過型光変調素子１６の短辺１６０６部分を収容するように構成され、より詳細には、前記透過型光変調素子１６に前記見切り部材３０が取着された状態で前記短辺１６０６部分を収容するように構成されている。
【００２０】
図２、図５に示すように、前記入射側偏光板収容凹部４２は、前記入射側偏光板１２の厚さに対応した幅を形成するように互いに対向する２つの側面４２０２と、前記入射側偏光板１２の短辺に対応した長さを形成するように互いに対向する２つの端面４２０４と、深さ方向の底部に位置する底面４２０６とを有し、前記入射側偏光板１２の短辺１２０２部分を収容するように構成されている。
前記出射側偏光板収容凹部４４は、前記出射側偏光板１４の厚さに対応した幅を形成するように互いに対向する２つの側面４４０２と、前記出射側偏光板１４の短辺１４０２部分に対応した長さを形成するように互いに対向する２つの端面４４０４と、深さ方向の底部に位置する底面４４０６とを有し、前記出射側偏光板１４の短辺１４０２部分を収容するように構成されている。
また、前記２つの取付部材４０のうち一方の取付部材４０の前記底面４６０６、４２０６、４４０６は、基準面４６０６Ａ、４２０６Ａ、４４０６Ａとして形成されている。なお、以下の説明において基準面４６０６Ａ、４２０６Ａ、４４０６Ａを有する取付部材４０を一方の取付部材４０と呼び、基準面４６０６Ａ、４２０６Ａ、４４０６Ａを有していない取付部材４０を他方の取付部材４０と呼ぶ。
【００２１】
図２、図５に示すように、前記取付部材４０の長さ方向の両端近傍には、取付片部４１が突設され、該取付片部４１には取付孔４１０２がそれぞれ設けられている。
また、前記底面４６０６、４２０６、４４０６を構成する前記取付部材４０の側壁の中央には、前記透過型光変調素子収容凹部４６に連通する開口４８が設けられている。
本実施の形態では、前記２つの取付部材４０は熱伝導性に優れたアルミで構成されている。
【００２２】
次に、前記光変調素子ユニット１０の組立てについて説明する。
まず、図２に示すように、前記透過型光変調素子１６の光入射面１６０２を入射側見切り板３２の下面に臨ませるとともに、前記透過型光変調素子１６の光出射面１６０４を出射側見切り板３６の上面に臨ませるように、前記透過型光変調素子１６を入射側見切り板３２と出射側見切り板３６の間に挿入する。
そして、前記透過型光変調素子１６の光入射面１６０２の中央を前記入射窓３４に臨ませ、かつ、前記透過型光変調素子１６の光出射面１６０４の中央を前記出射窓３８に臨ませる。
次いで、前記透過型光変調素子１６の映像表示領域の輪郭と、前記入射窓３４の輪郭とに基づいて透過型光変調素子１６の見切り部材３０への位置決めを行なう。この状態で、前記透過型光変調素子１６の光出射面１６０４が前記出射側見切り板３６の上面に載置され、かつ、前記透過型光変調素子１６の光入射面１６０２と前記入射側見切り板３２の下面との間には隙間Ｓ１が形成されている。
前記位置決めがなされた状態で、前記透過型光変調素子１６を前記見切り部材３０に取着する。本実施の形態では、前記透過型光変調素子１６の第２防塵ガラス２４の４つの角部近傍の端面箇所と、該端面箇所に臨む前記出射側見切り板３４の端面箇所とのそれぞれにわたってＵＶ硬化型の接着剤を塗布して硬化させる。
これにより、図３に示すように、前記透過型光変調素子１６と前記見切り部材３０が一体的に取り付けられた見切り部材一体型透過型光変調素子１６Ａが得られる。
【００２３】
次に、図２、図５に示すように、入射側偏光板１２、見切り部材一体型透過型光変調素子１６Ａ、出射側偏光板１４の各両側部を、それぞれ取付部材４０の前記入射側偏光板収容凹部４２、透過型光変調素子収容凹部４６、出射側偏光板収容凹部４４に収容し接着剤により接着する。
本実施の形態では、前記透過型光変調素子１６の基準辺１６０６Ａ部分を一方の取付部材４０の透過型光変調素子収容凹部４６に挿入し、前記基準面１８０２を前記基準面４６０６Ａに当接させる。これにより、前記透過型光変調素子１６の液晶の透過軸１６０２、１６０４はそれぞれ前記基準面４６０６Ａに対して平行および直交をなすように位置決めされる。前記位置決めされた状態で、第２防塵ガラス２４の端面と前記基準面４６０６ＡとにわたりＵＶ硬化型の接着剤５０を塗布し、前記接着剤５０を硬化させることにより、前記透過型光変調素子１６の基準辺１６０６Ａ部分と一方の取付部材４０とを接着固定する。なお、前記位置決めされた状態で前記基準面４６０６Ａと、該基準面４６０６Ａに対向する前記対向基板２０および第１防塵ガラス２２の端面との間には空間Ｋが形成されている。
【００２４】
また、前記入射側偏光板１２の基準辺１２０２Ａ部分を一方の取付部材４０の入射側偏光板収容凹部４２に挿入し、前記基準辺１２０２Ａを前記基準面４２０６Ａに当接させる。これにより、前記入射側偏光板１２の偏光軸１２０４は前記基準面４２０６Ａに対して平行をなすように位置決めされる。前記位置決めされた状態で、前記入射側偏光板収容凹部４２の縁部と該縁部近傍の前記入射側偏光板１２箇所とにわたりＵＶ硬化型の接着剤５０を塗布する。そして、前記接着剤５０を硬化させることにより、前記入射側偏光板１２と一方の取付部材４０とを接着固定する。
【００２５】
また、前記出射側偏光板１４の基準辺１４０２Ａ部分を一方の取付部材４０の出射側偏光板収容凹部４４に挿入し、前記基準辺１４０２Ａを前記基準面４４０６Ａに当接させる。これにより、前記出射側偏光板１４の偏光軸１４０４は前記基準面４２０６Ａに対して直交をなすように位置決めされる。前記位置決めされた状態で、前記出射側偏光板収容凹部４４の縁部と該縁部近傍の前記出射側偏光板１４箇所とにわたりＵＶ硬化型の接着剤５０を塗布する。そして、前記接着剤５０を硬化させることにより、前記出射側偏光板１４と一方の取付部材４０とを接着固定する。
【００２６】
そして、前記基準辺１６０６Ａ、１２０２Ａ、１４０２Ａを有さない各透過型光変調素子１６、入射側偏光板１２、出射側偏光板１４の短辺１６０６、１２０６、１４０６部分を他方の取付部材４０の透過型光変調素子収容凹部４６、入射側偏光板収容凹部４２、出射側偏光板収容凹部４４にそれぞれ挿入する。
この場合、前記ＴＦＴ基板１８の端面１８０２を前記透過型光変調素子収容凹部４６の底面４６０６に当接させ、この状態で第２防塵ガラス２４の端面と前記底面４６０６とにわたりＵＶ硬化型の接着剤５０を塗布する。そして、前記接着剤５０を硬化させることにより、前記透過型光変調素子１６の短辺１６０６部分と他方の取付部材４０とを接着固定する。なお、この状態で前記底面４６０６と、該底面４６０６に対向する前記対向基板２０および第１防塵ガラス２２の端面との間にも空間Ｋが形成されている。
なお、本実施の形態では、前記短辺１６０６部分が前記２つの取付部材４０の透過型光変調素子収容凹部４６にそれぞれ収容された状態で、前記見切り部材３０の出射側見切り板３６の下面が、透過型光変調素子収容凹部４６の両側面４２０２のうちの一方の側面に当接され、前記見切り部材３０の入射側見切り板３２の上面と他方の側面との間には隙間Ｓ２が形成されている。
また、入射側偏光板１２の短辺１６０６部分を他方の取付部材４０の入射側偏光板収容凹部４２に挿入したならば、前記入射側偏光板収容凹部４２の縁部と該縁部近傍の前記入射側偏光板１２箇所とにわたりＵＶ硬化型の接着剤５０を塗布して該接着剤５０を硬化させることにより、前記入射側偏光板１２と他方の取付部材４０とを接着固定する。
同様に、出射側偏光板１４の短辺１４０６部分を他方の取付部材４０の出射側偏光板収容凹部４４に挿入したならば、前記出射側偏光板収容凹部４４の縁部と該縁部近傍の前記出射側偏光板１４箇所とにわたりＵＶ硬化型の接着剤５０を塗布して該接着剤５０を硬化させることにより、前記出射側偏光板１４と取付部材４０の他方とを接着固定する。
これにより、前記前記入射側偏光板１２、前記透過型光変調素子１６、前記出射側偏光板１４は、前記光入射面１６０２および入射側見切り板３２に対して前記入射側偏光板１２が隙間Ｄ１を空けて対向し、かつ、前記光出射面１６０４および出射側見切り板３６に対して前記出射側偏光板１４が隙間Ｄ２を空けて対向するように配置され、かつ、これら入射側偏光板１２、透過型光変調素子１６（見切り部材一体型透過型光変調素子１６Ａ）、出射側偏光板１４の対向する両辺部分がそれぞれ前記取付部材４０に取着される。
【００２７】
次いで、前記空間Ｋに熱伝導性を有するシーリング材５２を充填する。前記シーリング材５２の充填は、シーリング材用のディスペンサ装置のシリンジの先端を前記開口４８に挿入し該シリンジ先端の吐出口からシーリング材５２を吐出させることによって行なわれる。
本実施の形態では、前記シーリング材５２として熱伝導性を有するシリコンゴムが用いられている。
以上のようにして前記光変調素子ユニット１０が簡単に組み立てられる。
【００２８】
次に、前記光変調素子ユニット１０のクロスダイクロイックプリズム１２２への取付について説明する。
図６に示すように、前記クロスダイクロイックプリズム１２２は不図示の固定部材により筐体１０２に取り付けられており、該クロスダイクロイックプリズム１２２の一側面部１２２Ａ、後面部１２２Ｂ、他側面部１２２Ｃの両側には、それぞれプリズム側取付部材６０が設けられ、各プリズム側取付部材６０にはそれぞれ２つの取付突片６２が設けられている。前記各取付突片６２は、前記一側面部１２２Ａ、後面部１２２Ｂ、他側面部１２２Ｃのそれぞれの四隅近傍箇所に位置している。
前記光変調素子ユニット１０は、前記出射側偏光板１４をクロスダイクロイックプリズム１２２の一側面部１２２Ａ（後面部１２２Ｂ、他側面部１２２Ｃ）に対面させ、前記各取付孔４１０２に前記取付突片６２を挿入し、光変調素子ユニット１０と一側面部１２２Ａ（後面部１２２Ｂ、他側面部１２２Ｃ）との位置決めを行なった状態で、前記各取付孔４１０２と前記取付突片６２の間の隙間に接着剤を充填して硬化させることで前記クロスダイクロイックプリズム１２２に取り付けられる。
【００２９】
次に、光変調素子ユニット１０および投射型表示装置１００の作用、効果について説明する。
１）前記光変調素子ユニット１０には、前記光入射面１６０２と前記入射側偏光板１４との間に隙間Ｄ１が形成され、かつ、前記光出射面１６０４と前記出射側偏光板１４との間に隙間Ｄ２が形成されているので、これら隙間Ｄ１、Ｄ２によって空気が流通するダクトが形成されることになる。したがって、透過型光変調素子１６が光源１０４からの光束が入射されることにより、あるいは、透過型光変調素子１６が駆動されることによってその温度が上昇しても、この熱は前記ダクトを流通する空気によって速やかに放熱される。
したがって、透過型光変調素子１６の温度上昇を抑える上で有利となり、映像の品質を確保する上で有利となる。
２）前記光変調素子ユニット１０では、前記透過型光変調素子１６の光入射側の透過軸１６０８は前記取付部材４０の基準面４６０６Ａに対して平行し、光出射側の透過軸１６１０は前記取付部材４０の基準面４６０６Ａに対して直交し、前記入射側偏光板１２の偏光軸１２０４は前記取付部材４０の基準面４２０６Ａに対して平行し、前記出射側偏光板１４の偏光軸１４０４は前記取付部材４０の基準面４４０６Ａに対して直交している。
ここで、前記基準面４２０６Ａ、４４０６Ａは互いに平行しているので、前記入射側偏光板１２の偏光軸１２０４と前記出射側偏光板１４の偏光軸１４０４は互いに第１の所定角度として９０度を形成することになる。
また、前記基準面４６０６Ａ、４２０６Ａ、４４０６Ａも互いに平行しているので、前記液晶の光入射側の透過軸１６０８と入射側偏光板１２の偏光軸１２０４は互いに平行し、かつ、前記液晶の光出射側の透過軸１６１０と前記出射側偏光板１４の偏光軸１４０４は互いに平行することになる。
したがって、前記光変調素子ユニット１０で形成される映像のコントラストを確保する上で最適な状態となるように、透過型光変調素子１６の液晶の透過軸と入射側偏光板１２の偏光軸と出射側偏光板１４の偏光軸との相対的な位置合わせがなされるので、光変調素子ユニット１０によって形成される映像の品質を向上させる上で有利となる。
また、前記透過型光変調素子１６の液晶の透過軸と入射側偏光板１２の偏光軸と出射側偏光板１４の偏光軸との相対的な位置合わせが、透過型光変調素子１６、入射側偏光板１２、出射側偏光板１４を２つの取付部材４０に取着するのみで容易に行なうことができるので、光変調素子ユニット１０を簡単に組み立てることができ、安価な光変調素子ユニット１０を得る上で有利となる。
３）前記２つの取付部材４０が熱伝導性を有する材料により形成され、これら取付部材４０と透過型光変調素子１６との間に確保した空間Ｋに熱伝導性を有するシーリング材５２を充填したので、透過型光変調素子１６の温度が上昇しても、この熱は前記シーリング材５２を介して前記取付部材４０に速やかに伝導され放熱される。
したがって、透過型光変調素子１６の温度上昇を抑える上で有利となり、映像の品質を確保する上で有利となる。
４）透過型光変調素子１６の両端の取付部材４０は互いに切り離されているので、透過型光変調素子１６は取付部材４０との熱膨張差による影響を受けにくい。
したがって、透過型光変調素子１６が、これを支持するための他の部材との熱膨張差による応力を受けて変形することが防止され、前記透過型光変調素子１６に表示される映像に濃淡ムラが生じることがなく映像の品質を確保する上で有利となる。
５）前記光変調素子ユニット１０は、前記入射側偏光板１２、透過型光変調素子１６、出射側偏光板１４の対向する両辺部分がそれぞれ前記取付部材４０に取着されることで一体的に構成されているので、光変調素子ユニット１０を前記クロスダイクロイックプリズム１２２などの取付対象となる部材に取り付ける際には光変調素子ユニット１０を位置決めして取り付ければよく、前記入射側偏光板１２、透過型光変調素子１６、出射側偏光板１４のそれぞれを独立して位置決めする場合に比較して組み立てが簡単になり、組み立てコストを削減する上で有利である。
【００３０】
図７は取付部材４０の変形例を示す斜視図である。
なお、以下に説明する変形例、他の実施の形態では、前記第１の実施の形態と同様の部材、箇所について第１の実施の形態と同一の符号を付して説明し、その詳細説明を省略する。
この変形例では、前記取付部材４０の側部の外側に放熱用フィン４００２を設けたものである。前記放熱用フィン４００２は、取付部材４０の側部の外側で長さ方向に沿って延在形成されている。
このように構成した場合には、前記透過型光変調素子１６から前記取付部材４０に伝達された熱を前記放熱フィン４００２を介して速やかに放熱することができ、透過型光変調素子１６の温度上昇を抑える上でより一層有利となる。
【００３１】
次に、第２の実施の形態について説明する。
第２の実施の形態が第１の実施の形態と異なる点は、第１防塵ガラスとしてサファイアからなる透明基板を用いた点である。
前記サファイアは、その熱伝導率が４０Ｗ／ｍ・℃であり、一般的なガラスの熱伝導率１乃至２Ｗ／ｍ・℃に比較して格段に高く、冷却性能に優れている。したがって、第１防塵ガラスとしてサファイアからなる透明基板を用いることで透過型光変調素子１６の温度上昇をより効果的に抑えることが期待できる。
しかしながら、サファイアは光学異方性を有しているため、サファイアを透過する光が複屈折する特性を持っている。このため、サファイアを前記第１防塵ガラスとして用いる場合には、該第１防塵ガラスを透過する光の偏光に影響を与えないように、すなわち前記複屈折が生じないようにする必要がある。
したがって、サファイアからなる透明基板のＣ軸と前記透過型光変調素子１６の液晶の透過軸１６０８、１６１０、入射側偏光板１２の偏光軸１２０４、出射側偏光板１４の偏光軸１６０４との相対的な位置関係を前記複屈折が生じないようにする必要がある。
以下、このような複屈折の発生を防止した第２の実施の形態について説明する。
【００３２】
図８は第２の実施の形態の透過型光変調素子の分解斜視図、図９は同透過型光変調素子の断面正面図である。
図８に示すように、第２の実施の形態では、第１防塵ガラス２２Ａとしてサファイアからなる透明基板を用いている。
前記第１防塵ガラス２２Ａは、矩形板状に形成され、互いに対向する短辺２２０２部分の一方を基準辺２２０２Ａとして該基準辺２２０２Ａに対してそのＣ軸２２０４が平行または直交の一方をなすように構成されている。本実施の形態では、基準辺２２０２Ａに対して前記Ｃ軸２２０４が平行をなすように構成されている。
前記光変調素子ユニット１０を組み立てる際、透過型光変調素子１６を構成する前記ＴＦＴ基板１８、対向基板２０、第１防塵ガラス２２Ａ、第２防塵ガラス２４のうち、第１防塵ガラス２２Ａを除いた前記ＴＦＴ基板１８、対向基板２０、第２防塵ガラス２４のみを重ねて接着し、入射側見切り板３２と出射側見切り板３６との間に挿入し、第２防塵ガラス２４の下面を出射側見切り板３６に載せ、第２防塵ガラス２４の下面を出射側見切り板に接着剤により固定する。
【００３３】
次に、図９に示すように、前記見切り部材３０が取着され前記第１防塵ガラス２２が取着されていない状態の透過型光変調素子１６の基準辺１６０６Ａ部分を一方の取付部材４０の透過型光変調素子収容凹部４６に挿入し、前記基準面１８０２を前記基準面４６０６Ａに当接させる。これにより、前記透過型光変調素子１６の液晶の透過軸１６０２、１６０４はそれぞれ前記基準面４６０６Ａに対して平行および直交をなすように位置決めされる。前記位置決めされた状態で、第２防塵ガラス２４の端面箇所と前記基準面４６０６Ａとにわたり接着剤５０を塗布する。
【００３４】
次いで、前記第１防塵ガラス２２Ａを前記対向基板２０の上面に載せ該第１防塵ガラス２２Ａの基準辺２２０２Ａ部分を前記一方の取付部材４０の前記透過型光変調素子収容凹部４６に挿入し、前記基準辺２２０２Ａを前記基準面４６０６Ａに当接させる。これにより、前記第１防塵ガラス２２ＡのＣ軸２２０４はそれぞれ前記基準面４６０６Ａに対して平行をなすように位置決めされる。前記位置決めされた状態で、前記第１防塵ガラス２２Ａの下面と前記対向基板２０の上面との間に接着剤５０を塗布するとともに、第１防塵ガラス２２Ａの端面箇所と前記基準面４６０６Ａとにわたり接着剤５０を塗布する。
そして、前記のように塗布した接着剤５０を硬化させることにより、前記透過型光変調素子１６を一体的に構成すると同時に、前記透過型光変調素子１６の基準辺１６０６Ａと一方の取付部材４０とを固定する。
以下、第１の実施の形態と同様の手順で、透過型光変調素子１６に対して入射側偏光板１２、出射側偏光板１４と他方の取付部材４０とを取付けることにより光変調素子ユニット１０を組み立て、また、前記光変調素子ユニット１０をクロスダイクロイックプリズム１２２へ取り付ける。
【００３５】
このようにして構成された第２の実施の形態の光変調素子ユニット１０および投射型表示装置１００によれば、第１の実施の形態の作用効果に加えて次のような作用効果を奏することができる。
すなわち、前記光変調素子ユニット１０では、前記第１防塵ガラス２２ＡのＣ軸２２０４は前記取付部材４０の基準面４６０６Ａに対して平行し、前記入射側偏光板１２の偏光軸１２０４は前記取付部材４０の基準面４２０６Ａに対して平行し、透過型光変調素子１６の前記入射側偏光板１２の偏光軸１２０２は前記取付部材４０の基準面４４０６Ａに対して平行している。
したがって、第１防塵ガラス２２ＡのＣ軸２２０４と、入射側偏光板１２の偏光軸１２０４と、出射側偏光板１４の偏光軸１６０４と、前記透過型光変調素子１６の液晶の透過軸１６０８とが何れも平行をなす位置関係となり、前記第１防塵ガラス２２Ａによる複屈折の発生を防止することができる。
これにより、熱伝導率の高いサファイアで構成された第１防塵ガラスによって透過型光変調素子１６の放熱を効果的に行なうことができ、映像の品質を確保する上で有利となる。
また、前記第１防塵ガラス２２ＡのＣ軸２２０４と入射側偏光板１２の偏光軸１２０４と透過型光変調素子１６の入射側の透過軸１６０８との相対的な位置合わせが、前記第１防塵ガラス２２Ａ、該前記第１防塵ガラス２２Ａを除く透過型光変調素子１６、入射側偏光板１２、出射側偏光板１４を２つの取付部材４０に取着するのみで容易に行なうことができるので組み立てコストを削減する上で有利となる。
なお、第１防塵ガラスとしてサファイアを用いる代りに、第２防塵ガラスとしてサファイアを用いていもよいし、第１、第２防塵ガラスの双方にサファイアを用いてもよい。
また、前記サファイアを用いた第１または第２防塵ガラスの基準辺を前記収容凹部４６の基準面４６０６Ａに当接することでＣ軸の位置決めを行なうのではなく、予め第１または第２防塵ガラスのＣ軸を透過型光変調素子１６の液晶の透過軸に対して位置決めした状態で透過型光変調素子１６を構成しておき、第１の実施の形態と同様に透過型光変調素子１６の基準辺１６０６Ａを基準面４６０６Ａに当接することで前記偏光軸および前記透過軸とＣ軸との相対的な位置決めがなされるように構成してもよい。
【００３６】
次に、第３の実施の形態について説明する。
第３の実施の形態が第１の実施の形態と異なる点は、２つの取付部材がそれぞれ内側取付部材と外側取付部材とで構成されている点である。
図１０は光変調素子ユニットの構成を示す分解斜視図、図１１は内側取付部材の斜視図、図１２は光変調素子ユニットの断面正面図、図１３（Ａ）は光変調素子ユニットの内側取付部材が最上位位置に位置した状態を示す図、（Ｂ）は光変調素子ユニットの内側取付部材が最下位位置に位置した状態を示す図、図１４は光変調素子ユニットの取付状態を示す斜視図である。
【００３７】
図１０に示すように、各光変調素子ユニット１０Ａ、１０Ｂ、１０Ｃは、すなわち光変調素子ユニット１０は、透過型光変調素子１６と、見切り部材３０と、入射側偏光板１２と、出射側偏光板１４と、２つの取付部材７０とを備え、前記各取付部材７０は、図１０に示すように、内側取付部材８０と外側取付部材９０とから構成されている。
【００３８】
前記内側取付部材８０は、直線状に延在するブロック状に形成され、その側面には、前記透過型光変調素子１６を収容する収容凹部８２が細長形状に形成されている。
図１０、図１１に示すように、前記収容凹部８２は、前記見切り部材３０が取着された状態の透過型光変調素子１６の厚さに対応した幅を形成するように互いに対向する２つの側面８２０２と、前記見切り部材３０が取着された状態の透過型光変調素子１６の短辺に対応した長さを形成するように互いに対向する２つの端面８２０４と、深さ方向の底部に位置する底面８２０６とを有し、前記見切り部材３０が取着された状態の透過型光変調素子１６の短辺１６０６部分を収容するように構成されている。
また、前記２つの内側取付部材８０のうち一方の内側取付部材８０の底面８２０６は、基準面８２０６Ａとして形成されている。なお、以下の説明において基準面８２０６Ａを有する内側取付部材８０を一方の内側取付部材８０と呼び、基準面８２０６Ａを有していない内側取付部材８０を他方の内側取付部材８０と呼ぶ。
【００３９】
図１０、図１１に示すように、前記内側取付部材８０の長さ方向の両端近傍には、取付片部８１が突設され、該取付片部８１には取付孔８１０２がそれぞれ設けられいる。
また、前記内側取付部材８０の前記底面８２０６を構成する側壁８４には、２つの凸部８６が間隔をおいて突設され、これら２つの凸部８６の中間箇所には、前記収容凹部８２に連通する開口８８が設けられている。
本実施の形態では、前記内側取付部材８０は熱伝導性に優れたアルミで構成されている。
【００４０】
前記各外側取付部材９０は、矩形板状の板部９２と、板部９２の上下の２辺からそれぞれ屈曲された入射側偏光板取付板部９４と、出射側偏光板取付板部９６とを有している。
前記板部９２には、前記内側取付部材８０の２つの凸部８６に係合することで、該内側取付部材８０を上下に案内する２つの案内溝９２０２が上下方向に延在形成されており、前記板部９２の内側面９２０４は平坦面として形成されている。
前記入射側偏光板取付板部９４は、前記入射側偏光板１２の短辺１２０２部分に対応する寸法の長さを有し、前記出射側偏光板取付板部９６は、前記出射側偏光板１４の短辺１４０２部分に対応する寸法の長さを有している。
また、前記２つの外側取付部材９０のうち一方の外側取付部材９０の前記内側面９２０４は基準面９２０４Ａとされる。なお、以下の説明において基準面９２０４Ａを有する外側取付部材９０を一方の外側取付部材９０とよび、基準面９２０４Ａを有していない外側取付部材９０を他方の外側取付部材９０と呼ぶ。
そして、一方の内側取付部材８０の側壁８４を一方の外側取付部材９０の基準面９２０４Ａに当接することで収容凹部９２の基準面９２０４Ａと前記外側取付部材９０の基準面９２０４Ａとが互いに平行するように構成されている。
本実施の形態では、前記外側取付部材９０も熱伝導性に優れたアルミで構成されている。
【００４１】
次に、前記光変調素子ユニット１０の組立てについて説明する。
前記透過型光変調素子１６に対する前記見切り部材３０の取着は第１の実施の形態と同様になされ、図３に示すように、前記透過型光変調素子１６と前記見切り部材３０が一体的に取り付けられることにより、前記透過型光変調素子１６と前記見切り部材３０が一体的に取り付けられた見切り部材一体型透過型光変調素子１６Ａが得られる。
【００４２】
次に、図１０、図１２に示すように、前記見切り部材一体型透過型光変調素子１６Ａの２つの短辺１６０６部分のうち基準辺１６０６Ａを構成する部分を一方の内側取付部材８０の収容凹部８２に挿入し、前記基準面１８０２を前記基準面８２０６Ａに当接させる。これにより、前記透過型光変調素子１６の液晶の透過軸１６０２、１６０４はそれぞれ前記基準面８２０６Ａに対して平行および直交をなすように位置決めされる。前記位置決めされた状態で、前記第２防塵ガラス２４の端面と前記基準面８２０６ＡとにわたりＵＶ硬化型の接着剤５０を塗布する。そして、前記接着剤５０を硬化させることにより、前記見切り部材一体型透過型光変調素子１６Ａの一方の短辺１６０６部分と一方の内側取付部材８０とを接着固定する。なお、前記位置決めされた状態で前記基準面８２０６Ａと、該基準面８２０６Ａに対向する前記対向基板２０および第１防塵ガラス２２の端面との間には空間Ｋが形成されている。
【００４３】
次いで、前記見切り部材一体型透過型光変調素子１６Ａの他方の短辺１６０６部分（基準辺１６０６Ａと反対側の短辺部分）を他方の内側取付部材８０の収容凹部８２に挿入する。
そして、他方の短辺１６０６部分を前記収容凹部８２の底面８２０６に当接させ、この状態で第２防塵ガラス２４の端面と前記底面８２０６とにわたり接着剤５０を塗布する。そして、前記接着剤を硬化させることにより、前記見切り部材一体型透過型光変調素子１６Ａの他方の短辺１６０６部分と他方の内側取付部材８０とを接着固定する。なお、この状態で前記底面８２０６と、該底面８２０６に対向する前記対向基板２０および第１防塵ガラス２２の端面との間にも空間Ｋが形成されている。
本実施の形態では、前記見切り部材一体型透過型光変調素子１６Ａの短辺１６０６部分が前記２つの内側取付部材８０の収容凹部８２にそれぞれ収容された状態で、前記見切り部材３０の出射側見切り板３６の下面が前記収容凹部８２の両側面８２０２の一方に当接され、前記見切り部材３０の入射側見切り板３２の上面と前記両側面８２０２の他方との間には隙間Ｓ２が形成されている。
次いで、前記空間Ｋに熱伝導性を有するシーリング材５２を充填する。前記シーリング材５２の充填は、シーリング材用のディスペンサ装置のシリンジの先端を前記開口８８に挿入し該シリンジ先端の吐出口からシーリング材５２を吐出させることによって行なわれる。
本実施の形態では、前記シーリング材５２として熱伝導性を有するシリコンゴムが用いられている。
【００４４】
次に、図１０、図１２に示すように、前記入射側偏光板１２の短辺１２０２部分のうち基準辺１２０２Ａを一方の外側取付部材９０に取着する。すなわち、前記入射側偏光板１２の上面を前記外側取付部材９０の入射側偏光板取付板部９４の下面に当接させつつ前記基準辺１２０２Ａを前記外側取付部材９０の基準面９２０４Ａに当接させる。これにより、前記入射側偏光板１２の偏光軸１２０４は前記基準面９２０４Ａに対して平行をなすように位置決めされる。前記位置決めされた状態で、前記入射側偏光板取付板部９４の縁部と該縁部近傍の前記入射側偏光板１２箇所とにわたりＵＶ硬化型の接着剤５０を塗布する。そして、前記接着剤５０を硬化させることにより、前記入射側偏光板１２と一方の外側取付部材９０とを接着固定する。
【００４５】
次に、図１０、図１２に示すように、前記出射側偏光板１４の短辺１４０２部分のうち基準辺１４０２Ａを一方の外側取付部材９０に取着する。すなわち、前記出射側偏光板１４の下面を前記外側取付部材９０の出射側偏光板取付板部９６の上面に当接させつつ前記基準辺１４０２Ａを前記外側取付部材９０の基準面９２０４Ａに当接させる。これにより、前記出射側偏光板１４の偏光軸１４０４は前記基準面９２０４Ａに対して直交をなすように位置決めされる。前記位置決めされた状態で、前記出射側偏光板取付板部９６の縁部と該縁部近傍の前記出射側偏光板１４箇所とにわたりＵＶ硬化型の接着剤５０を塗布する。そして、前記接着剤５０を硬化させることにより、前記出射側偏光板１４と一方の外側取付部材９０とを接着固定する。
【００４６】
次いで、前記透過型光変調素子１６が取り付けられた状態の２つの内側取付部材８０のうち、一方の内側取付部材８０の側壁８４を、前記一方の外側取付部材９０の基準面９２０４Ａに接触させ、前記２つの凸部８６を前記２つの案内溝９２０２に係合させる。
そして、他方の内側取付部材８０の外面８４を、他方の外側取付部材９０の内側面９２０４に接触させ、前記２つの凸部８６を前記２つの案内溝９２０２に係合させる。
この状態で、前記入射側偏光板１２の他方の短辺１２０２部分（基準辺１２０２Ａと反対側の短辺部分）を他方の外側取付部材９０に取着する。すなわち、前記入射側偏光板１２の上面を前記外側取付部材９０の入射側偏光板取付板部９４の下面に当接させつつ前記短辺１２０２部分を前記外側取付部材９０の内側面９２０４に当接させ、この状態で、前記入射側偏光板取付板部９４の縁部と該縁部近傍の前記入射側偏光板１２箇所とにわたりＵＶ硬化型の接着剤５０を塗布する。そして、前記接着剤５０を硬化させることにより、前記入射側偏光板１２と外側取付部材９０の他方とを接着固定する。
【００４７】
また、前記出射側偏光板１４の他方の短辺１４０２部分（基準辺１４０２Ａと反対側の短辺部分）を他方の外側取付部材９０に取着する。すなわち、前記出射側偏光板１４の下面を前記外側取付部材９０の出射側偏光板取付板部９６の上面に当接させつつ前記短辺１４０２部分を前記外側取付部材９０の内側面９２０４に当接させ、この状態で、前記出射側偏光板取付板部９６の縁部と該縁部近傍の前記出射側偏光板１４箇所とにわたりＵＶ硬化型の接着剤５０を塗布する。そして、前記接着剤５０を硬化させることにより、前記出射側偏光板１４と他方の外側取付部材９０とを接着固定する。
これにより、前記光入射面１６０２に対して前記入射側偏光板１２が隙間Ｄ１を空けて対向し、かつ、前記光出射面１６０４に対して前記出射側偏光板１４が隙間Ｄ２を空けて対向するように配置される。
そして、前記２つの内側部材８０の凸部８６が２つの外側部材９０の案内溝９２０２に案内されることで、前記透過型光変調素子１６は、該透過型光変調素子１６の厚さ方向（光の透過方向）に移動可能に保持される。
したがって、前記隙間Ｄ１、Ｄ２が所望の寸法となるように前記透過型光変調素子１６を位置調節した状態で、前記２つの内側部材８０の凸部８６と２つの外側部材９０の案内溝９２０２との間に接着剤を塗布して固定する。
これにより、図１４に示すように、前記入射側偏光板１２、透過型光変調素子１６、出射側偏光板１４の対向する両短辺部分がそれぞれ前記２つの外側取付部材９０に取着される。
以上のようにして前記光変調素子ユニット１０が簡単に組み立てられる。
【００４８】
前記光変調素子ユニット１０のクロスダイクロイックプリズム１２２への取付は前記第１の実施の形態と同様であり、図１４に示すように、前記出射側偏光板１４をクロスダイクロイックプリズム１２２の一側面部１２２Ａ（後面部１２２Ｂ、他側面部１２２Ｃ）に対面させ、前記各取付孔８１０２に前記取付突片６２を挿入し、光変調素子ユニット１０と一側面部１２２Ａ（後面部１２２Ｂ、他側面部１２２Ｃ）との位置決めを行なった状態で、前記各取付孔８１０２と前記取付突片６２の間の隙間に接着剤を充填して硬化させることで前記クロスダイクロイックプリズム１２２に取り付けられる。
【００４９】
次に、光変調素子ユニット１０および投射型表示装置１００の作用、効果について説明する。
１）前記透過型光変調素子１６の前記光入射面１６０２と前記入射側偏光板１４との間に隙間Ｄ１が形成され、かつ、前記透過型光変調素子１６の前記光出射面１６０４と前記出射側偏光板１４との間に隙間Ｄ２が形成されているので、これら隙間Ｄ１、Ｄ２によって空気が流通するダクトが形成されることになる。したがって、透過型光変調素子１６が光源１０４からの光束が入射されることにより、あるいは、透過型光変調素子１６が駆動されることによってその温度が上昇しても、この熱は前記ダクトを流通する空気によって速やかに放熱される。
したがって、透過型光変調素子１６の温度上昇を抑える上で有利となり、映像の品質を確保する上で有利となる。
また、図１３（Ａ）、（Ｂ）に示すように前記透過型光変調素子１６を最上位から最下位までの任意の高さ位置に位置調節できるので、前記隙間Ｄ１、Ｄ２に流通する空気流による放熱効果が最も得られるように前記隙間Ｄ１とＤ２の比率を設定することができ、透過型光変調素子１６の温度上昇を抑える上で有利となり、映像の品質を確保する上で有利となる。
２）前記光変調素子ユニット１０では、前記透過型光変調素子１６の光入射側の透過軸１６０８は前記内側取付部材８０の基準面８２０６Ａに対して平行し、光出射側の透過軸１６１０は前記内側取付部材８０の基準面８２０６Ａに対して直交し、前記入射側偏光板１２の偏光軸１２０４は前記外側取付部材９０の基準面９２０４Ａに対して平行し、前記出射側偏光板１４の偏光軸１４０４は前記外側取付部材９０の基準面９２０４Ａに対して直交している。
ここで、前記基準面８２０６Ａ、９２０４は互いに平行しているので、前記入射側偏光板１２の偏光軸１２０４と前記出射側偏光板１４の偏光軸１４０４は互いに第１の所定角度として９０度を形成することになり、かつ、前記液晶の光入射側の透過軸１６０８と入射側偏光板１２の偏光軸１２０４は互いに平行し、かつ、前記液晶の光出射側の透過軸１６１０と前記出射側偏光板１４の偏光軸１４０４は互いに平行することになる。
したがって、前記光変調素子ユニット１０で形成される映像のコントラストを確保する上で最適な状態となるように、透過型光変調素子１６の液晶の透過軸と入射側偏光板１２の偏光軸と出射側偏光板１４の偏光軸との相対的な位置合わせがなされるので、光変調素子ユニット１０によって形成される映像の品質を向上させる上で有利となる。
また、前記透過型光変調素子１６の液晶の透過軸と入射側偏光板１２の偏光軸と出射側偏光板１４の偏光軸との相対的な位置合わせが、透過型光変調素子１６、入射側偏光板１２、出射側偏光板１４を２つの取付部材７０に取着するのみで容易に行なうことができるので組み立てコストを削減する上で有利となる。
３）前記２つの内側取付部材８０が熱伝導性を有する材料により形成され、これら内側取付部材８０と透過型光変調素子１６との間に確保した空間Ｋに熱伝導性を有するシーリング材５２を充填したので、透過型光変調素子１６の温度が上昇しても、この熱は前記シーリング材５２を介して前記内側取付部材８０に速やかに伝導され放熱される。
したがって、透過型光変調素子１６の温度上昇を抑える上で有利となり、映像の品質を確保する上で有利となる。
４）透過型光変調素子１６の両端の取付部材７０は互いに切り離されているので、透過型光変調素子１６は取付部材７０との熱膨張差による影響を受けにくい。
したがって、透過型光変調素子１６が、これを支持するための他の部材との熱膨張差による応力を受けて変形することが防止され、前記透過型光変調素子１６に表示される映像に濃淡ムラが生じることがなく映像の品質を確保する上で有利となる。
５）前記光変調素子ユニット１０は、前記入射側偏光板１２、透過型光変調素子１６、出射側偏光板１４の対向する両辺部分がそれぞれ前記取付部材７０に取着されることで一体的に構成されているので、光変調素子ユニット１０を前記クロスダイクロイックプリズム１２２などの取付対象となる部材に取り付ける際には光変調素子ユニット１０を位置決めして取り付ければよく、前記入射側偏光板１２、透過型光変調素子１６、出射側偏光板１４のそれぞれを独立して位置決めする場合に比較して組み立てコストを削減する上で有利である。
【００５０】
次に、第４の実施の形態について説明する。
第４の実施の形態が第３の実施の形態と異なる点は、第１防塵ガラス２２Ａとしてサファイアからなる透明基板を用いた点である。
前記第２の実施の形態と同様に、サファイアは、冷却性能に優れているため、第１防塵ガラス２２Ａとしてサファイアからなる透明基板を用いることで透過型光変調素子１６の温度上昇をより効果的に抑えることが期待できる。
しかしながら、サファイアは光学異方性を有しているため、サファイアからなる透明基板のＣ軸と前記透過型光変調素子１６の液晶の透過軸１６０８、１６１０、入射側偏光板１２の偏光軸１２０４、出射側偏光板１４の偏光軸１６０４との相対的な位置関係を前記複屈折が生じないようにする必要がある。
以下、このような複屈折の発生を防止した前記光変調素子ユニットについて説明する。
【００５１】
図１５は第４の実施の形態の透過型光変調素子の分解斜視図、図１６は同透過型光変調素子の断面正面図である。
図１４に示すように、第４の実施の形態では、第１防塵ガラス２２Ａとしてサファイアからなる透明基板を用いる。
前記第１防塵ガラス２２Ａは、矩形板状に形成され、互いに対向する短辺２２０２部分の一方を基準辺２２０２Ａとして該基準辺２２０２Ａに対してそのＣ軸２２０４が平行または直交の一方をなすように構成されている。本実施の形態では、基準辺２２０２Ａに対して前記Ｃ軸２２０４が平行をなすように構成されている。
前記光変調素子ユニット１０を組み立てる際、透過型光変調素子１６を構成する前記ＴＦＴ基板１８、対向基板２０、第１防塵ガラス２２Ａ、第２防塵ガラス２４のうち、第１防塵ガラス２２Ａを除いた前記ＴＦＴ基板１８、対向基板２０、第２防塵ガラス２４のみを重ねて接着し、見切り部材３０を第２防塵ガラス２４の下面に接着剤５０により固定する。
【００５２】
次に、図１６に示すように、前記見切り部材３０が取着され前記第１防塵ガラス２２が取着されていない状態の透過型光変調素子１６の基準辺１６０６Ａを一方の内側取付部材８０の収容凹部８２に挿入し、前記基準面１８０２を前記基準面８２０６Ａに当接させる。これにより、前記透過型光変調素子１６の液晶の透過軸１６０２、１６０４はそれぞれ前記基準面８２０６Ａに対して平行および直交をなすように位置決めされる。前記位置決めされた状態で、前記基準辺１６０６Ａの端面箇所と前記基準面８２０６Ａとにわたり接着剤を塗布する。
【００５３】
次いで、前記第１防塵ガラス２２Ａを前記対向基板２０の上面に載せ該第１防塵ガラス２２Ａの基準辺２２０２Ａを前記基準面８２０６Ａに当接させる。これにより、前記第１防塵ガラス２２ＡのＣ軸２２０４はそれぞれ前記基準面８２０６Ａに対して平行をなすように位置決めされる。前記位置決めされた状態で、前記第１防塵ガラス２２Ａの下面と前記対向基板２０の上面との間に接着剤を塗布するとともに、前記基準辺２２０２Ａの端面箇所と前記基準面８２０６Ａとにわたり接着剤を塗布する。
そして、前記接着剤５０を硬化させることにより、前記透過型光変調素子１６を構成する第１、第２防塵ガラス２２Ａ、２４、ＴＦＴ基板１８、対向基板２０を一体的に構成すると同時に、前記透過型光変調素子１６の基準辺１６０６Ａ部分と一方の内側取付部材８０とを接着固定する。
以下、第３の実施の形態と同様の手順で、前記透過型光変調素子１６に対して他方の内側取付部材８０を取付け、次いで前記入射側偏光板１２、透過型光変調素子１６、出射側偏光板１４の対向する両辺部分をそれぞれ前記２つの外側取付部材８０に取着することにより光変調素子ユニット１０を組み立て、また、前記光変調素子ユニット１０をクロスダイクロイックプリズム１２２へ取り付ける。
【００５４】
このようにして構成された第４の実施の形態の光変調素子ユニット１０および投射型表示装置１００によれば、第３の実施の形態の作用効果に加えて次のような作用効果を奏することができる。
すなわち、前記光変調素子ユニット１０では、前記第１防塵ガラス２２ＡのＣ軸２２０４は前記取付部材４０の基準面８２０６Ａに対して平行し、前記入射側偏光板１２の偏光軸１２０４は前記取付部材４０の基準面４２０６Ａに対して平行し、透過型光変調素子１６の前記入射側偏光板１２の偏光軸１２０２は前記取付部材４０の基準面４４０６Ａに対して平行している。
したがって、第１防塵ガラス２２ＡのＣ軸２２０４と、入射側偏光板１２の偏光軸１２０４と、出射側偏光板１４の偏光軸１６０４と、前記透過型光変調素子１６の液晶の透過軸１６０８とが何れも平行をなす位置関係となり、前記第１防塵ガラス２２Ａによる複屈折の発生を防止することができる。
これにより、熱伝導率の高いサファイアで構成された第１防塵ガラスによって透過型光変調素子１６の放熱を効果的に行なうことができ、映像の品質を確保する上で有利となる。
また、前記第１防塵ガラス２２ＡのＣ軸２２０４と入射側偏光板１２の偏光軸１２０４と透過型光変調素子１６の入射側の透過軸１６０８との相対的な位置合わせが、前記第１防塵ガラス２２Ａ、該前記第１防塵ガラス２２Ａを除く透過型光変調素子１６、入射側偏光板１２、出射側偏光板１４を２つの取付部材４０に取着するのみで容易に行なうことができるので組み立てコストを削減する上で有利となる。
なお、第１防塵ガラスとしてサファイアを用いる代りに、第２防塵ガラスとしてサファイアを用いていもよいし、第１、第２防塵ガラスの双方にサファイアを用いてもよい。
また、前記サファイアを用いた第１または第２防塵ガラスの基準辺を前記収容凹部８２の基準面８２０６Ａに当接することでＣ軸の位置決めを行なうのではなく、予め第１または第２防塵ガラスのＣ軸を透過型光変調素子１６の液晶の透過軸に対して位置決めした状態で透過型光変調素子１６を構成しておき、第１の実施の形態と同様に透過型光変調素子１６の基準辺１６０６Ａを基準面８２０６Ａに当接することで前記偏光軸および前記透過軸とＣ軸との相対的な位置決めがなされるように構成してもよい。
【００５５】
【発明の効果】
以上説明したように、本発明によれば、組み立てコストを削減する上で有利な光変調ユニット及び投射型表示装置並びに光変調ユニットの組立方法を提供することができる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態の投射型表示装置の構成を示す構成図である。
【図２】第１の実施の形態の光変調素子ユニットの構成を示す分解斜視図である。
【図３】光変調素子ユニットの組立状態を示す斜視図である。
【図４】取付部材の斜視図である。
【図５】光変調素子ユニットの断面正面図である。
【図６】光変調素子ユニットの取付状態を示す斜視図である。
【図７】取付部材の変形例を示す斜視図である。
【図８】第２の実施の形態の透過型光変調素子の分解斜視図である。
【図９】同透過型光変調素子の断面正面図である。
【図１０】第３の実施の形態の光変調素子ユニットの構成を示す分解斜視図である。
【図１１】内側取付部材の斜視図である。
【図１２】光変調素子ユニットの断面正面図である。
【図１３】（Ａ）は光変調素子ユニットの内側取付部材が最上位位置に位置した状態を示す図、（Ｂ）は光変調素子ユニットの内側取付部材が最下位位置に位置した状態を示す図である。
【図１４】光変調素子ユニットの取付状態を示す斜視図である。
【図１５】第４の実施の形態の透過型光変調素子の分解斜視図である。
【図１６】同透過型光変調素子の断面正面図である。
【符号の説明】
１００……投射型表示装置、１０……光変調素子ユニット、１２……入射側偏光板、１４……出射側偏光板、１６……透過型光変調素子、１６０２……光入射面、１６０４……光出射面、４０……取付部材、７０……取付部材、８０……内側取付部材、９０……外側取付部材。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light modulation element unit and a projection display device.
[0002]
[Prior art]
2. Related Art There has been provided a projection display device that modulates light from a light source based on a video signal using a transmission-type light modulation element and projects the light-modulated light on a screen or the like to form an image ( Patent Document 1).
The transmission type light modulation element is configured by sealing liquid crystal between transparent substrates made of, for example, quartz glass, and performs image display by driving the liquid crystal based on the image signal. The light modulation is performed by transmitting light from a light source to a liquid crystal displaying an image to form an image of the image.
The transmission type light modulation element is fixed to a frame made of, for example, an aluminum material by an adhesive, positioned with respect to the optical member of the projection display device via the frame, and attached to the optical member side. I have.
Further, an incident side polarizing plate and an emitting side polarizing plate are provided on the incident side and the emitting side of the transmission type light modulation element, respectively, and these incident side polarizing plate and emitting side polarizing plate are provided on the optical member of the projection type display device. On the other hand, it is positioned separately from the transmission type light modulation element, and is attached to the optical member side.
[0003]
[Patent Document 1]
JP 2000-180958 A
[0004]
[Problems to be solved by the invention]
However, in such a configuration in which the transmission type light modulation element, the incident side polarization plate and the emission side polarization plate are individually positioned and attached to the optical member side, the transmission type light modulation element, the incidence side polarization plate and The work of positioning the emission-side polarizing plates is troublesome and time-consuming, which is disadvantageous in reducing the assembly cost.
The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a light modulation unit and a projection display device that are advantageous in reducing assembly costs.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a light modulation element unit according to the present invention, wherein a light incident surface on which light is incident in one of the thickness directions is formed, and the light incident on the other in the thickness direction is formed. A rectangular plate-shaped transmission type light modulation element having a light emitting surface from which light is emitted, a rectangular plate-shaped incident side polarizing plate, a rectangular plate-shaped emitting side polarizing plate, and two mounting members, The incident side polarizing plate faces the light incident surface of the transmission type light modulation element with a gap, and the emission side polarization plate faces the light emission surface of the transmission type light modulation element with a gap. In this state, both sides of the incident-side polarizing plate, the transmission-type light modulation element, and the output-side polarizing plate are attached to the mounting member.
Further, the projection display device of the present invention forms an image by light-modulating light from a light source based on a video signal by a light modulation element unit, and projects the image formed by the light modulation element unit. In the projection display device, the light modulation element unit has a light incident surface on which light is incident on one side in a thickness direction and a light exit surface on which the incident light exits on the other side in the thickness direction. The formed rectangular plate-shaped transmission type light modulation element, a rectangular plate-shaped incident side polarization plate, a rectangular plate-shaped emission side polarization plate, and two mounting members, and the transmission type light modulation element In a state where the incident side polarizing plate faces the light incident surface with a gap, and the emitting side polarizing plate faces the light emitting surface of the transmission type light modulation element with a gap, these incident side polarization plates are arranged. Plate, transmission-type light modulator, and exit-side polarizing plate Wherein the side portions of the is attached to the mounting member, respectively.
Therefore, according to the light modulation element unit and the projection type display device of the present invention, the transmission type light modulation element, the incident-side polarizing plate and the output-side polarizing plate are positioned relative to each other by the mounting member, and before mounting on the optical member. , Can be pre-assembled.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram showing the configuration of the projection display device according to the first embodiment of the present invention.
The projection display apparatus 100 has a housing 102 in which three light modulation element units 10A, 10B, and 10C according to the present invention are disposed.
These three light modulation element units 10A, 10B, and 10C are supplied with a video signal via a control circuit from a video signal supplier (not shown), such as a television tuner device, a video tape player device, or a video disk player device. It is configured to display an image based on this image signal.
Each of the light modulation element units 10A, 10B, and 10C has a transmission-type light modulation element, and displays an image by a change in transmittance (shading). Of the three light modulation element units, the light modulation element unit 10A displays a red component of an image corresponding to the video signal, the light modulation element unit 10B displays a green component of an image corresponding to the video signal, The light modulation element unit 10C displays a blue component of an image corresponding to the image signal.
[0007]
Further, a light source 104, a UV filter 106, multi-lens arrays 108 and 110, a condenser lens 112, a first dichroic mirror 114A, a second dichroic mirror 114B, and first to third condenser lenses are provided in the housing 102. 116A, 116B, 116C, first and second condenser lenses 118, 120, a cross dichroic prism 122, a projection lens 124, and the like are provided.
The light source 104 is formed of a high-luminance white lamp such as a halogen lamp. The light emitted from the light source 104 passes through the UV filter 106 and the multi-lens arrays 108 and 110 in order, and The light enters the first dichroic mirror 114A which is disposed at an angle.
The first dichroic mirror 114A reflects only the red component light R of the light beam and deflects it by 90 degrees, and transmits the green component light G and the blue component light B of the light beam.
The red component light R reflected by the first dichroic mirror 114A is reflected by the first mirror 126A, deflected by 90 degrees, sequentially transmitted through the first condenser lens 116A and the light modulation unit 10A, and cross-dichroic prism. The light is incident on one side surface portion 122 </ b> A.
[0008]
The green component light G and the blue component light B transmitted through the first dichroic mirror 114A are inclined by 45 degrees with respect to the luminous fluxes of the green component light G and the blue component light B. The light enters the mirror 114B. The second dichroic mirror 114B reflects only the green component light G of the green component light G and the blue component light B, deflects it by 90 degrees, and transmits the remaining blue component light B.
The green component light G reflected by the second dichroic mirror 114B sequentially passes through the second condenser lens 116B and the light modulation unit 10B, and is incident on the rear surface 122B of the cross dichroic prism 122.
[0009]
The blue component light B transmitted through the second dichroic mirror 114A is transmitted through the first condenser lens 118, and the second mirror disposed at an angle of 45 degrees with respect to the light flux of the blue component light B It is incident on 126B, reflected and deflected by 90 degrees.
The blue component light B reflected by the second mirror 126B passes through the second condenser lens 120, is reflected by the third mirror 126C, is deflected by 90 degrees, and sequentially passes through the condenser lens 116C and the light modulation unit 10C. The light passes through and enters the other side surface portion 122C of the cross dichroic prism 122.
The first and second condenser lenses 118 and 120 respectively transmit the red component light R, the green component light G and the blue component light B from the light source 10 to the light modulation element units 10A, 10B and 10C. Of the optical path lengths of the blue component light B, since the optical path length of the blue component light B is longer than the optical path lengths of the red component light R and the green component light G, the blue component light B is easily diffused. It is for focusing.
[0010]
The cross dichroic prism 122 combines the red component light R incident from the one side surface portion 122A, the green component light G incident from the rear surface portion 122B, and the blue component light B incident from the other side surface portion 122C. From the front surface 122D. In the present embodiment, the cross dichroic prism 122 forms an optical member as a color combining optical system.
The light beam emitted from the front part 122D of the cross dichroic prism 122 is incident on the projection lens 124. The projection lens projects the incident light beam forward of the housing.
That is, the projection lens 124 forms an image of an image displayed by the light modulation element units 10A, 10B, and 10C and illuminated by the light source 104 on a screen installed in front of the housing 102. .
[0011]
2 is an exploded perspective view showing a configuration of the light modulation element unit, FIG. 3 is a perspective view showing an assembled state of the light modulation element unit, FIG. 4 is a perspective view of a mounting member, and FIG. 5 is a sectional front view of the light modulation element unit. FIG. 6 is a perspective view showing an attached state of the light modulation element unit.
As shown in FIG. 2, each of the light modulation element units 10A, 10B, and 10C includes a transmission-type light modulation element 16, a parting member 30, a light-incident-side polarizing plate 12, a light-emitting-side polarizing plate 14, and two mounting members. And a member 40.
Since the configurations of the light modulation element units 10A, 10B, and 10C are substantially the same, the light modulation element unit 10 will be described below.
As shown in FIG. 5, the transmission type light modulation element 16 is formed in a substantially rectangular shape in a plan view by laminating a TFT substrate 18, a counter substrate 20, a first dustproof glass 22, a second dustproof glass 24, and the like. A flexible substrate 26 is connected to the type light modulation element 16 (TFT substrate 18).
The TFT substrate 18 is formed of a transparent substrate formed in a rectangular shape, a transparent electrode is formed in a rectangular area in the center of the upper surface of the transparent substrate, and a liquid crystal driving circuit is formed around the transparent electrode on the upper surface. Is formed.
[0012]
The counter substrate 20 is formed of a transparent substrate having a slightly smaller vertical and horizontal dimension than the TFT substrate 18. The opposing substrate 20 is disposed so that four sides of the opposing substrate 20 and four sides of the TFT substrate 18 are parallel to each other, and is opposed to the transparent electrode of the TFT substrate 18. And a liquid crystal is sealed between them.
The liquid crystal forms a video display area having a rectangular outline.
[0013]
The first dustproof glass 22 is formed of a transparent substrate having a slightly smaller vertical and horizontal dimension than the counter substrate 20. The first dust-proof glass 22 is disposed such that four sides of the first dust-proof glass 22 and four sides of the counter substrate 20 are parallel to each other, and is superposed on the upper surface of the counter substrate 20, and is bonded by an adhesive. I have.
[0014]
The second dustproof glass 24 is formed of a transparent substrate that is slightly smaller in vertical and horizontal dimensions than the TFT substrate 18. The second dustproof glass 24 is disposed such that four sides of the second dustproof glass 24 and four sides of the TFT substrate 18 are parallel to each other, and is superposed on the lower surface of the TFT substrate 18 and is bonded by an adhesive. I have.
[0015]
Therefore, in the present embodiment, the upper surface of the first dustproof glass 22 is located on one side in the thickness direction of the transmissive light modulation element 16 and constitutes a light incident surface 1602 through which light from the light source 104 is incident. ing.
Further, the lower surface of the second dustproof glass 24 is located on the other side in the thickness direction of the transmission type light modulation element 16 and constitutes a light exit surface 1604 from which light incident on the light entrance surface 1602 exits.
The liquid crystal sealed between the TFT substrate 18 and the opposing substrate 20 has a light incident side when one of the opposing short sides 1606 of the transmissive light modulation element 16 is a reference side 1606A. One of the transmission axis and the transmission axis on the light emission side is configured to be parallel to the reference side 1606A, and the other of the transmission axis on the light incidence side and the transmission axis on the light emission side is orthogonal to the reference side 1606A. I have.
In the present embodiment, the transmission axis 1608 on the light incident side of the liquid crystal is parallel to the reference side 1606A, and the transmission axis 1610 on the light emission side of the liquid crystal is orthogonal to the reference side 1606A. I have.
In the present embodiment, the reference side 1606A is constituted by an end face 1802 of the TFT substrate 18, and the TFT substrate 18, the counter substrate 20, the first and second dustproof glasses 22, 24 are constituted by quartz glass. I have.
[0016]
As shown in FIG. 1, the flexible substrate 26 is formed in a belt shape, and a plurality of connection terminals are provided at both ends in the longitudinal direction. A connection terminal on one end of the flexible substrate 26 is connected to a connection terminal of the liquid crystal driving circuit provided on the TFT substrate 18, and a connection terminal on the other end of the flexible substrate 26 is connected to an external circuit. Then, a liquid crystal driving signal is supplied from the external circuit to the liquid crystal driving circuit via the flexible substrate 26.
Then, the liquid crystal sealed between the TFT substrate 18 and the opposing substrate 20 is driven based on the liquid crystal driving signal, whereby an image is displayed.
[0017]
As shown in FIG. 2, the parting member 30 includes a rectangular entrance side parting plate 32 having an entrance window 34 formed therein, and a rectangular exit side parting plate 32 having an exit window 38 formed therein and facing the entrance side parting plate 32. 36, and a connecting plate 39 for connecting the parting plates 32, 36, and has a substantially rectangular shape in plan view.
The entrance side parting plate 32 and the exit side parting plate 36 are provided so as to be parallel to each other, and the dimension from the lower surface of the entrance side parting plate 32 to the upper surface of the exit side parting plate 36 is the transmission type light modulation element. The thickness is slightly larger than the thickness of No. 16.
The entrance side parting plate 32 restricts the transmission area of the light beam transmitted through the light entrance surface 1602 of the light modulation element unit 16 by the entrance window 34, so that unnecessary light is transmitted to the light entrance surface 1602 of the light modulation element unit 16. It is intended to prevent the light from entering or being reflected from the light incident surface 1602.
The exit side parting plate 36 restricts the transmission area of the light flux transmitted through the light exit surface 1604 of the light modulation element unit 16 by the exit window 38, so that unnecessary light is transmitted to the light exit surface 1604 of the light modulation element unit 16. It is intended to prevent the light from entering and being reflected from the light emitting surface 1602.
The parting member 30 is formed of a material that does not transmit light, such as a metal, and is formed of a thin plate of aluminum or stainless steel in the present embodiment.
[0018]
The incident side polarizing plate 12 is formed in a rectangular plate shape, and is configured such that one of the short sides 1202 facing each other is set as a reference side 1202A, and a polarization axis 1204 of the short side 1202A is parallel or orthogonal to the reference side 1202A. Have been. In the present embodiment, the polarization axis 1204 is configured to be parallel to the reference side 1202A.
The output side polarizing plate 14 is formed in a rectangular plate shape, and is configured such that one of the short sides 1402 facing each other is set as a reference side 1402A, and its polarization axis 1404 is parallel or orthogonal to the reference side 1402A. Have been. In the present embodiment, the polarization axis 1404 is configured to be orthogonal to the reference side 1402A.
[0019]
As shown in FIGS. 2 and 4, the two mounting members 40 are formed in a block shape extending linearly, and the side surfaces thereof include the incident side polarizing plate 12, the transmission type light modulation element 16, An incident-side polarizing plate housing recess 42, which accommodates the emission-side polarizing plate 14, a transmission-type light modulation element housing recess 46, and an emission-side polarizing plate housing recess 44, respectively, are formed in an elongated shape.
As shown in FIGS. 2 and 5, the transmission type light modulation element accommodating recess 46 has a width corresponding to the thickness of the transmission type light modulation element 16 in a state where the parting member 30 is attached. Two side faces 4602 facing each other, two end faces 4604 facing each other so as to form a length corresponding to the short side of the transmission type light modulation element 16 in a state where the parting member 30 is attached, and a depth. And a bottom surface 4606 located at the bottom in the direction, and configured to accommodate the short side 1606 of the transmission type light modulation element 16, and more specifically, the transmission type light modulation element 16 is provided with the parting member 30. Is configured to accommodate the short side 1606 portion in a state where is attached.
[0020]
As shown in FIGS. 2 and 5, the incident side polarizing plate housing recess 42 has two side surfaces 4202 facing each other so as to form a width corresponding to the thickness of the incident side polarizing plate 12, and It has two end surfaces 4204 facing each other so as to form a length corresponding to the short side of the polarizing plate 12, and a bottom surface 4206 located at the bottom in the depth direction. It is configured to accommodate a portion.
The emission-side polarizing plate housing recess 44 corresponds to two side surfaces 4402 facing each other so as to form a width corresponding to the thickness of the emission-side polarizing plate 14, and a short side 1402 portion of the emission-side polarizing plate 14. It has two end surfaces 4404 opposed to each other so as to form a predetermined length, and a bottom surface 4406 located at the bottom in the depth direction, and is configured to accommodate a short side 1402 portion of the output side polarizing plate 14. ing.
Further, the bottom surfaces 4606, 4206, and 4406 of one of the two mounting members 40 are formed as reference surfaces 4606A, 4206A, and 4406A. In the following description, the mounting member 40 having the reference surfaces 4606A, 4206A, and 4406A is referred to as one mounting member 40, and the mounting member 40 having no reference surfaces 4606A, 4206A, and 4406A is referred to as the other mounting member 40. .
[0021]
As shown in FIGS. 2 and 5, mounting pieces 41 are protruded near both ends in the length direction of the mounting member 40, and mounting holes 4102 are provided in the mounting pieces 41, respectively.
At the center of the side wall of the mounting member 40 forming the bottom surfaces 4606, 4206, and 4406, an opening 48 communicating with the transmission type light modulation element housing recess 46 is provided.
In the present embodiment, the two mounting members 40 are made of aluminum having excellent heat conductivity.
[0022]
Next, the assembly of the light modulation element unit 10 will be described.
First, as shown in FIG. 2, the light incident surface 1602 of the transmission type light modulation element 16 is made to face the lower surface of the incident side parting plate 32, and the light emission surface 1604 of the transmission type light modulation element 16 is cut off on the emission side. The transmission type light modulation element 16 is inserted between the entrance side parting plate 32 and the emission side parting plate 36 so as to face the upper surface of the plate 36.
Then, the center of the light incident surface 1602 of the transmission type light modulation element 16 faces the incident window 34, and the center of the light emission surface 1604 of the transmission type light modulation element 16 faces the emission window 38.
Next, the transmission type light modulation element 16 is positioned on the parting member 30 based on the outline of the image display area of the transmission type light modulation element 16 and the outline of the entrance window 34. In this state, the light emitting surface 1604 of the transmission type light modulation element 16 is placed on the upper surface of the emission side parting plate 36, and the light incident surface 1602 of the transmission type light modulation element 16 and the incident side parting plate 36 A gap S <b> 1 is formed between the lower surface 32 and the lower surface.
In the state where the positioning is performed, the transmission type light modulation element 16 is attached to the parting member 30. In the present embodiment, UV curing is performed on each of the end face locations near the four corners of the second dustproof glass 24 of the transmission type light modulation element 16 and the end face location of the emission side parting plate 34 facing the end face location. Apply and cure mold adhesive.
As a result, as shown in FIG. 3, the transmission type light modulating element 16 and the parting member 30 are integrally attached to obtain a parting member integrated transmission type light modulation element 16A.
[0023]
Next, as shown in FIGS. 2 and 5, both sides of the incident-side polarizing plate 12, the parting member-integrated transmission type light modulator 16A, and the emitting-side polarizing plate 14 are respectively attached to the incident-side polarization of the mounting member 40. It is housed in the plate housing recess 42, the transmission type light modulation element housing recess 46, and the emission side polarizing plate housing recess 44, and is adhered by an adhesive.
In the present embodiment, the reference side 1606A of the transmission type light modulation element 16 is inserted into the transmission type light modulation element accommodating recess 46 of one of the mounting members 40, and the reference surface 1802 is brought into contact with the reference surface 4606A. . Thereby, the transmission axes 1602 and 1604 of the liquid crystal of the transmission type light modulation element 16 are positioned so as to be parallel and perpendicular to the reference plane 4606A, respectively. In the positioned state, the UV-curable adhesive 50 is applied over the end face of the second dust-proof glass 24 and the reference surface 4606A, and the adhesive 50 is cured, whereby the transmission-type light modulation element 16 The reference side 1606A and the one attachment member 40 are bonded and fixed. In the positioned state, a space K is formed between the reference surface 4606A and the end surfaces of the opposing substrate 20 and the first dust-proof glass 22 facing the reference surface 4606A.
[0024]
The reference side 1202A of the incident side polarizing plate 12 is inserted into the incident side polarizing plate housing recess 42 of one of the mounting members 40, and the reference side 1202A is brought into contact with the reference surface 4206A. Thereby, the polarization axis 1204 of the incident side polarizing plate 12 is positioned so as to be parallel to the reference plane 4206A. In the positioned state, a UV-curable adhesive 50 is applied over the edge of the incident-side polarizing plate housing recess 42 and the 12 incident-side polarizing plates near the edge. Then, by curing the adhesive 50, the incident-side polarizing plate 12 and one of the mounting members 40 are bonded and fixed.
[0025]
The reference side 1402A of the output side polarizing plate 14 is inserted into the output side polarizing plate housing recess 44 of one of the mounting members 40, and the reference side 1402A is brought into contact with the reference surface 4406A. As a result, the polarization axis 1404 of the emission side polarizing plate 14 is positioned so as to be orthogonal to the reference plane 4206A. In the positioned state, a UV-curable adhesive 50 is applied over the edge of the emission-side polarizing plate housing recess 44 and the 14 locations of the emission-side polarizing plate near the edge. Then, by curing the adhesive 50, the emission-side polarizing plate 14 and one of the mounting members 40 are bonded and fixed.
[0026]
The short sides 1606, 1206, and 1406 of the transmission-type light modulation elements 16, the input-side polarizing plate 12, and the output-side polarizing plate 14 that do not have the reference sides 1606A, 1202A, and 1402A are transmitted through the other mounting member 40. The light-modulating element receiving recess 46, the incident-side polarizing plate receiving recess 42, and the emission-side polarizing plate receiving recess 44 are inserted into the recesses respectively.
In this case, the end surface 1802 of the TFT substrate 18 is brought into contact with the bottom surface 4606 of the concave portion 46 for accommodating the transmission type light modulation element, and in this state, the UV curable adhesive extends over the end surface of the second dustproof glass 24 and the bottom surface 4606. Apply 50. Then, by curing the adhesive 50, the short side 1606 of the transmission type light modulation element 16 and the other mounting member 40 are bonded and fixed. In this state, a space K is also formed between the bottom surface 4606 and the end surfaces of the counter substrate 20 and the first dustproof glass 22 facing the bottom surface 4606.
In the present embodiment, the lower side of the exit side parting plate 36 of the parting member 30 is in a state where the short side 1606 portion is accommodated in the transmission type light modulation element accommodating recess 46 of the two mounting members 40, respectively. A gap S2 is formed between the upper surface of the incident side parting plate 32 of the parting member 30 and the other side surface, in contact with one of the side surfaces 4202 of the transmission type light modulation element accommodating recess 46. ing.
Also, if the short side 1606 of the incident side polarizing plate 12 is inserted into the incident side polarizing plate housing recess 42 of the other mounting member 40, the edge of the incident side polarizing plate housing recess 42 and the vicinity The UV-curable adhesive 50 is applied over the incident-side polarizing plate 12 and the adhesive 50 is cured, whereby the incident-side polarizing plate 12 and the other mounting member 40 are bonded and fixed.
Similarly, if the short side 1406 portion of the output side polarizing plate 14 is inserted into the output side polarizing plate housing recess 44 of the other mounting member 40, the edge of the output side polarizing plate housing recess 44 and the vicinity of the edge portion A UV-curable adhesive 50 is applied over the emission-side polarizing plate 14 and the adhesive 50 is cured, whereby the emission-side polarization plate 14 and the other of the mounting members 40 are bonded and fixed.
Accordingly, the incident-side polarizing plate 12, the transmission-type light modulation element 16, and the output-side polarizing plate 14 are arranged such that the incident-side polarizing plate 12 is spaced from the light incident surface 1602 and the incident-side parting plate 32 by a gap D1. , And the emission-side polarizing plate 14 is disposed so as to face the light-emitting surface 1604 and the emission-side parting plate 36 with a gap D2 therebetween. The transmission-type light modulation element 16 (partition member-integrated transmission-type light modulation element 16A) and the opposite sides of the exit-side polarizing plate 14 are attached to the mounting member 40, respectively.
[0027]
Next, the space K is filled with a sealing material 52 having thermal conductivity. The filling of the sealing material 52 is performed by inserting the tip of a syringe of a dispenser device for the sealing material into the opening 48 and discharging the sealing material 52 from a discharge port at the tip of the syringe.
In the present embodiment, silicon rubber having thermal conductivity is used as the sealing material 52.
The light modulation element unit 10 is easily assembled as described above.
[0028]
Next, attachment of the light modulation element unit 10 to the cross dichroic prism 122 will be described.
As shown in FIG. 6, the cross dichroic prism 122 is attached to the housing 102 by a fixing member (not shown), and is provided on both sides of one side 122A, a rear 122B, and the other side 122C of the cross dichroic prism 122. Each of the prism-side mounting members 60 is provided with two mounting protrusions 62. The mounting projections 62 are located near the four corners of the one side surface 122A, the rear surface 122B, and the other side surface 122C.
The light modulation element unit 10 faces the output side polarizing plate 14 to one side surface portion 122A (the rear surface portion 122B and the other side surface portion 122C) of the cross dichroic prism 122, and attaches the mounting protrusion 62 to each of the mounting holes 4102. With the optical modulation element unit 10 and the positioning between the light modulating element unit 10 and the one side surface portion 122A (the rear surface portion 122B, the other side surface portion 122C) being performed, an adhesive is inserted into the gap between each of the mounting holes 4102 and the mounting protruding piece 62. Is attached to the cross dichroic prism 122 by curing.
[0029]
Next, functions and effects of the light modulation element unit 10 and the projection display device 100 will be described.
1) In the light modulation element unit 10, a gap D1 is formed between the light incident surface 1602 and the incident side polarizing plate 14, and a gap D1 between the light emitting surface 1604 and the output side polarizing plate 14. Is formed, a duct through which air flows is formed by the gaps D1 and D2. Therefore, even if the temperature of the transmission type light modulation element 16 rises due to the light flux from the light source 104 being incident or the transmission type light modulation element 16 being driven, this heat flows through the duct. Is quickly dissipated by the air.
Therefore, it is advantageous in suppressing a rise in the temperature of the transmissive light modulation element 16, and is advantageous in ensuring image quality.
2) In the light modulation element unit 10, the transmission axis 1608 on the light incident side of the transmission type light modulation element 16 is parallel to the reference surface 4606A of the mounting member 40, and the transmission axis 1610 on the light emission side is the mounting axis. The polarization axis 1204 of the incident side polarizing plate 12 is parallel to the reference plane 4206A of the mounting member 40, and the polarization axis 1404 of the emission side polarizing plate 14 is orthogonal to the reference plane 4606A of the member 40. It is orthogonal to the reference plane 4406A of the member 40.
Here, since the reference planes 4206A and 4406A are parallel to each other, the polarization axis 1204 of the incident-side polarizer 12 and the polarization axis 1404 of the output-side polarizer 14 form a first predetermined angle of 90 degrees with each other. Will do.
Since the reference planes 4606A, 4206A, and 4406A are also parallel to each other, the transmission axis 1608 on the light incident side of the liquid crystal and the polarization axis 1204 of the incident side polarizing plate 12 are parallel to each other, and the light emission of the liquid crystal is The transmission axis 1610 on the side and the polarization axis 1404 of the output side polarizing plate 14 are parallel to each other.
Therefore, the transmission axis of the liquid crystal of the transmission-type light modulation element 16 and the polarization axis of the incident-side polarizing plate 12 are adjusted so as to be in an optimal state for securing the contrast of the image formed by the light modulation element unit 10. Since the relative alignment with the polarization axis of the side polarizing plate 14 is performed, it is advantageous in improving the quality of an image formed by the light modulation element unit 10.
The relative alignment between the transmission axis of the liquid crystal of the transmission type light modulation element 16, the polarization axis of the incident side polarization plate 12, and the polarization axis of the emission side polarization plate 14 is determined by the transmission type light modulation element 16 and the incident side. Since the polarizing plate 12 and the emission-side polarizing plate 14 can be easily mounted simply by attaching them to the two mounting members 40, the light modulation element unit 10 can be easily assembled, and the inexpensive light modulation element unit 10 can be used. It is advantageous in obtaining.
3) The two mounting members 40 are formed of a material having thermal conductivity, and a space K secured between the mounting members 40 and the transmission type light modulation element 16 is filled with a sealing material 52 having thermal conductivity. Therefore, even if the temperature of the transmission type light modulation element 16 rises, this heat is quickly conducted to the mounting member 40 via the sealing material 52 and is radiated.
Therefore, it is advantageous in suppressing a rise in the temperature of the transmissive light modulation element 16, and is advantageous in ensuring image quality.
4) Since the mounting members 40 at both ends of the transmission type light modulation element 16 are separated from each other, the transmission type light modulation element 16 is hardly affected by a difference in thermal expansion from the mounting member 40.
Therefore, the transmissive light modulation element 16 is prevented from being deformed due to a stress due to a difference in thermal expansion between the transmissive light modulation element 16 and another member supporting the transmissive light modulation element 16, and the image displayed on the transmissive light modulation element 16 is shaded This is advantageous in ensuring image quality without causing unevenness.
5) The light modulation element unit 10 is integrally formed by attaching both sides of the incident-side polarization plate 12, the transmission-type light modulation element 16, and the emission-side polarization plate 14 to the mounting member 40, respectively. When the light modulation element unit 10 is mounted on a member to be mounted, such as the cross dichroic prism 122, the light modulation element unit 10 may be positioned and mounted. The assembly is simpler than in the case where the mold light modulation element 16 and the exit-side polarizing plate 14 are individually positioned, which is advantageous in reducing the assembly cost.
[0030]
FIG. 7 is a perspective view showing a modified example of the mounting member 40.
In the modified examples and other embodiments described below, the same members and portions as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the detailed description thereof will be given. Is omitted.
In this modified example, a heat dissipating fin 4002 is provided outside the side portion of the mounting member 40. The heat dissipating fins 4002 are formed to extend in the length direction outside the side portions of the mounting member 40.
With this configuration, heat transmitted from the transmission type light modulation element 16 to the mounting member 40 can be quickly radiated through the heat radiation fins 4002, and the temperature of the transmission type light modulation element 16 It is even more advantageous in suppressing the rise.
[0031]
Next, a second embodiment will be described.
The second embodiment differs from the first embodiment in that a transparent substrate made of sapphire is used as the first dust-proof glass.
The sapphire has a thermal conductivity of 40 W / m · ° C., which is much higher than the thermal conductivity of general glass of 1 to 2 W / m · ° C., and is excellent in cooling performance. Therefore, by using a transparent substrate made of sapphire as the first dustproof glass, it can be expected that the temperature rise of the transmission type light modulation element 16 can be more effectively suppressed.
However, since sapphire has optical anisotropy, it has the property that light transmitted through sapphire is birefringent. For this reason, when sapphire is used as the first dust-proof glass, it is necessary not to affect the polarization of light transmitted through the first dust-proof glass, that is, to prevent the birefringence from occurring.
Therefore, the relative axes of the C axis of the transparent substrate made of sapphire, the transmission axes 1608 and 1610 of the liquid crystal of the transmission type light modulation element 16, the polarization axis 1204 of the incident side polarizing plate 12, and the polarization axis 1604 of the emission side polarizing plate 14. It is necessary to prevent the above-mentioned birefringence from occurring in an appropriate positional relationship.
Hereinafter, a second embodiment in which such birefringence is prevented will be described.
[0032]
FIG. 8 is an exploded perspective view of a transmission type light modulation element according to the second embodiment, and FIG. 9 is a sectional front view of the transmission type light modulation element.
As shown in FIG. 8, in the second embodiment, a transparent substrate made of sapphire is used as the first dustproof glass 22A.
The first dustproof glass 22A is formed in a rectangular plate shape, and one of the short sides 2202 facing each other is set as a reference side 2202A such that its C axis 2204 is either parallel or orthogonal to the reference side 2202A. It is configured. In the present embodiment, the C-axis 2204 is configured to be parallel to the reference side 2202A.
When assembling the light modulating element unit 10, the first dustproof glass 22A was removed from the TFT substrate 18, the counter substrate 20, the first dustproof glass 22A, and the second dustproof glass 24 that constitute the transmission type light modulating element 16. Only the TFT substrate 18, the counter substrate 20, and the second dust-proof glass 24 are overlapped and bonded, and inserted between the incident-side parting plate 32 and the emission-side parting plate 36, and the lower surface of the second dust-proof glass 24 is parted on the emission side. It is placed on a plate 36 and the lower surface of the second dustproof glass 24 is fixed to the emission side parting plate with an adhesive.
[0033]
Next, as shown in FIG. 9, the reference side 1606 </ b> A of the transmission type light modulation element 16 in a state where the parting member 30 is attached and the first dustproof glass 22 is not attached is attached to one of the attachment members 40. The reference surface 1802 is inserted into the transmissive light modulation element accommodating recess 46, and the reference surface 1802 is brought into contact with the reference surface 4606A. Thereby, the transmission axes 1602 and 1604 of the liquid crystal of the transmission type light modulation element 16 are positioned so as to be parallel and perpendicular to the reference plane 4606A, respectively. In the positioned state, the adhesive 50 is applied over the end surface of the second dustproof glass 24 and the reference surface 4606A.
[0034]
Next, the first dust-proof glass 22A is placed on the upper surface of the counter substrate 20, and the reference side 2202A of the first dust-proof glass 22A is inserted into the transmission-type light modulation element accommodating recess 46 of the one attachment member 40. The reference side 2202A is brought into contact with the reference surface 4606A. Accordingly, the C-axis 2204 of the first dustproof glass 22A is positioned so as to be parallel to the reference surface 4606A. In the positioned state, an adhesive 50 is applied between the lower surface of the first dust-proof glass 22A and the upper surface of the counter substrate 20, and is adhered to the end surface of the first dust-proof glass 22A and the reference surface 4606A. The agent 50 is applied.
By curing the adhesive 50 applied as described above, the transmission-type light modulation element 16 is integrally formed, and at the same time, the reference side 1606A of the transmission-type light modulation element 16 and one of the mounting members 40 are connected. Is fixed.
Hereinafter, the light modulating element unit 10 is mounted by attaching the incident side polarizing plate 12, the output side polarizing plate 14 and the other mounting member 40 to the transmission type light modulating element 16 in the same procedure as in the first embodiment. And the light modulation element unit 10 is attached to the cross dichroic prism 122.
[0035]
According to the light modulation element unit 10 and the projection display device 100 of the second embodiment configured as described above, the following operation and effect can be obtained in addition to the operation and effect of the first embodiment. Can be.
That is, in the light modulation element unit 10, the C axis 2204 of the first dustproof glass 22A is parallel to the reference surface 4606A of the mounting member 40, and the polarization axis 1204 of the incident side polarizing plate 12 is And the polarization axis 1202 of the incident side polarizing plate 12 of the transmission type light modulation element 16 is parallel to the reference surface 4406A of the mounting member 40.
Therefore, the C axis 2204 of the first dustproof glass 22A, the polarization axis 1204 of the incident side polarizing plate 12, the polarization axis 1604 of the exit side polarizing plate 14, and the transmission axis 1608 of the liquid crystal of the transmission type light modulation element 16 are set. Both have a parallel positional relationship, and the occurrence of birefringence by the first dustproof glass 22A can be prevented.
Thus, the first dust-proof glass made of sapphire having high thermal conductivity can effectively dissipate the heat of the transmissive light modulation element 16, which is advantageous in securing image quality.
The relative positioning of the C axis 2204 of the first dustproof glass 22A, the polarization axis 1204 of the incident side polarizing plate 12, and the incident side transmission axis 1608 of the transmissive light modulator 16 is determined by the first dustproof glass. 22A, the transmission type light modulating element 16 except for the first dustproof glass 22A, the incident side polarizing plate 12, and the emitting side polarizing plate 14 can be easily mounted simply by attaching them to the two mounting members 40. This is advantageous in reducing
Instead of using sapphire as the first dustproof glass, sapphire may be used as the second dustproof glass, or sapphire may be used for both the first and second dustproof glasses.
In addition, the reference side of the first or second dustproof glass using the sapphire is brought into contact with the reference surface 4606A of the accommodating recess 46 to perform positioning of the C-axis, instead of the first or second dustproof glass. The transmission-type light modulation element 16 is configured with the C-axis positioned with respect to the transmission axis of the liquid crystal of the transmission-type light modulation element 16, and the reference of the transmission-type light modulation element 16 is set as in the first embodiment. A configuration may be made such that the polarization axis and the transmission axis and the C axis are relatively positioned by contacting the side 1606A with the reference plane 4606A.
[0036]
Next, a third embodiment will be described.
The third embodiment differs from the first embodiment in that the two mounting members are each formed of an inner mounting member and an outer mounting member.
10 is an exploded perspective view showing the configuration of the light modulation element unit, FIG. 11 is a perspective view of the inner mounting member, FIG. 12 is a cross-sectional front view of the light modulation element unit, and FIG. FIG. 14B is a diagram illustrating a state where the member is located at the highest position, FIG. 14B is a diagram illustrating a state where the inner mounting member of the light modulation element unit is positioned at the lowest position, and FIG. 14 is a perspective view illustrating a state where the light modulation element unit is mounted. FIG.
[0037]
As shown in FIG. 10, each of the light modulation element units 10A, 10B, and 10C, that is, the light modulation element unit 10 includes a transmission light modulation element 16, a parting member 30, an incident-side polarizing plate 12, and an output-side polarized light. It comprises a plate 14 and two mounting members 70, each of which is composed of an inner mounting member 80 and an outer mounting member 90, as shown in FIG.
[0038]
The inner mounting member 80 is formed in a block shape extending linearly, and a receiving recess 82 for receiving the transmission type light modulation element 16 is formed in an elongated shape on a side surface thereof.
As shown in FIGS. 10 and 11, the housing concave portion 82 has two opposing sides so as to form a width corresponding to the thickness of the transmission type light modulation element 16 in a state where the parting member 30 is attached. A side surface 8202, two end surfaces 8204 opposed to each other so as to form a length corresponding to the short side of the transmission type light modulation element 16 in a state where the parting member 30 is attached, and a position at the bottom in the depth direction. A bottom surface 8206 is formed to accommodate the short side 1606 of the transmission type light modulation element 16 in a state where the parting member 30 is attached.
The bottom surface 8206 of one of the two inner mounting members 80 is formed as a reference surface 8206A. In the following description, the inner mounting member 80 having the reference surface 8206A is referred to as one inner mounting member 80, and the inner mounting member 80 having no reference surface 8206A is referred to as the other inner mounting member 80.
[0039]
As shown in FIGS. 10 and 11, a mounting piece 81 is protruded near both ends in the length direction of the inner mounting member 80, and the mounting piece 81 is provided with mounting holes 8102.
Further, two protrusions 86 are protruded from the side wall 84 forming the bottom surface 8206 of the inner mounting member 80 at an interval, and an intermediate portion between these two protrusions 86 is formed in the housing recess 82. An opening 88 for communication is provided.
In the present embodiment, the inner mounting member 80 is made of aluminum having excellent heat conductivity.
[0040]
Each of the outer mounting members 90 includes a rectangular plate-shaped plate portion 92, an incident-side polarizing plate mounting plate portion 94 bent from two upper and lower sides of the plate portion 92, and an output-side polarizing plate mounting plate portion 96. Have.
The plate portion 92 is formed with two guide grooves 9202 extending in the vertical direction by guiding the inner mounting member 80 up and down by engaging with the two projections 86 of the inner mounting member 80. The inner surface 9204 of the plate portion 92 is formed as a flat surface.
The incident-side polarizing plate mounting plate portion 94 has a length corresponding to the short side 1202 of the incident-side polarizing plate 12, and the emission-side polarizing plate mounting plate portion 96 includes the emission-side polarizing plate 14. Has a length corresponding to that of the short side 1402.
The inner side surface 9204 of one of the two outer mounting members 90 is a reference surface 9204A. In the following description, the outer mounting member 90 having the reference surface 9204A is referred to as one outer mounting member 90, and the outer mounting member 90 having no reference surface 9204A is referred to as the other outer mounting member 90.
Then, the side wall 84 of the one inner mounting member 80 abuts against the reference surface 9204A of the one outer mounting member 90 so that the reference surface 9204A of the housing recess 92 and the reference surface 9204A of the outer mounting member 90 are parallel to each other. Is configured.
In the present embodiment, the outer mounting member 90 is also made of aluminum having excellent thermal conductivity.
[0041]
Next, the assembly of the light modulation element unit 10 will be described.
The attachment of the parting member 30 to the transmission type light modulation element 16 is performed in the same manner as in the first embodiment. As shown in FIG. 3, the transmission type light modulation element 16 and the parting member 30 are integrally formed. By being attached, the transmission type light modulation element 16 and the parting member 30 are integrally attached to obtain a parting member integrated transmission type light modulation element 16A.
[0042]
Next, as shown in FIG. 10 and FIG. 12, of the two short sides 1606 of the parting member-integrated transmissive light modulation element 16A, the part constituting the reference side 1606A is replaced with the accommodation recess of one inner mounting member 80. 82, and the reference surface 1802 is brought into contact with the reference surface 8206A. Thereby, the transmission axes 1602 and 1604 of the liquid crystal of the transmission type light modulation element 16 are positioned so as to be parallel and orthogonal to the reference plane 8206A, respectively. In the positioned state, the UV curing adhesive 50 is applied over the end surface of the second dustproof glass 24 and the reference surface 8206A. Then, by curing the adhesive 50, one short side 1606 of the parting member-integrated transmission type light modulation element 16A and one inner mounting member 80 are bonded and fixed. In the positioned state, a space K is formed between the reference surface 8206A and the end surfaces of the opposing substrate 20 and the first dustproof glass 22 facing the reference surface 8206A.
[0043]
Next, the other short side 1606 portion (the short side portion opposite to the reference side 1606A) of the parting member-integrated transmission type light modulation element 16A is inserted into the accommodation recess 82 of the other inner mounting member 80.
Then, the other short side 1606 is brought into contact with the bottom surface 8206 of the accommodation recess 82, and in this state, the adhesive 50 is applied between the end surface of the second dustproof glass 24 and the bottom surface 8206. Then, by curing the adhesive, the other short side 1606 of the parting member-integrated transmission type light modulation element 16A and the other inner mounting member 80 are bonded and fixed. In this state, a space K is also formed between the bottom surface 8206 and the end surfaces of the counter substrate 20 and the first dustproof glass 22 facing the bottom surface 8206.
In the present embodiment, the exit side parting of the parting member 30 in a state where the short sides 1606 of the parting member-integrated transmission type light modulation element 16A are accommodated in the accommodating recesses 82 of the two inner mounting members 80, respectively. The lower surface of the plate 36 is in contact with one of both side surfaces 8202 of the housing recess 82, and a gap S2 is formed between the upper surface of the incident side parting plate 32 of the parting member 30 and the other of the two side surfaces 8202. I have.
Next, the space K is filled with a sealing material 52 having thermal conductivity. The filling of the sealing material 52 is performed by inserting the tip of a syringe of a dispenser device for the sealing material into the opening 88 and discharging the sealing material 52 from a discharge port at the tip of the syringe.
In the present embodiment, silicon rubber having thermal conductivity is used as the sealing material 52.
[0044]
Next, as shown in FIGS. 10 and 12, the reference side 1202A of the short side 1202 of the incident side polarizing plate 12 is attached to one outer mounting member 90. That is, the reference side 1202A is brought into contact with the reference surface 9204A of the outer mounting member 90 while the upper surface of the incident side polarizing plate 12 is brought into contact with the lower surface of the incident side polarizing plate mounting plate portion 94 of the outer mounting member 90. . Thereby, the polarization axis 1204 of the incident side polarizing plate 12 is positioned so as to be parallel to the reference plane 9204A. In the positioned state, a UV-curable adhesive 50 is applied over the edge of the incident-side polarizing plate mounting plate 94 and the 12 incident-side polarizing plates near the edge. Then, the incident side polarizing plate 12 and one of the outer mounting members 90 are bonded and fixed by curing the adhesive 50.
[0045]
Next, as shown in FIGS. 10 and 12, the reference side 1402A of the short side 1402 portion of the emission-side polarizing plate 14 is attached to one outer mounting member 90. That is, the reference side 1402A contacts the reference surface 9204A of the outer mounting member 90 while the lower surface of the output polarizing plate 14 contacts the upper surface of the output polarizing plate mounting plate portion 96 of the outer mounting member 90. . As a result, the polarization axis 1404 of the emission side polarizing plate 14 is positioned so as to be orthogonal to the reference plane 9204A. In the positioned state, the UV-curable adhesive 50 is applied over the edge of the emission-side polarizing plate mounting plate 96 and the 14 locations of the emission-side polarizing plate near the edge. Then, by curing the adhesive 50, the emission-side polarizing plate 14 and one outer mounting member 90 are bonded and fixed.
[0046]
Next, of the two inner mounting members 80 in a state where the transmission type light modulation element 16 is mounted, the side wall 84 of the one inner mounting member 80 is brought into contact with the reference surface 9204A of the one outer mounting member 90, The two projections 86 are engaged with the two guide grooves 9202.
Then, the outer surface 84 of the other inner mounting member 80 is brought into contact with the inner surface 9204 of the other outer mounting member 90, and the two convex portions 86 are engaged with the two guide grooves 9202.
In this state, the other short side 1202 (the short side opposite to the reference side 1202A) of the incident side polarizing plate 12 is attached to the other outer mounting member 90. That is, the short side 1202 abuts against the inner side surface 9204 of the outer mounting member 90 while the upper surface of the incident side polarizing plate 12 is in contact with the lower surface of the incident side polarizing plate mounting plate portion 94 of the outer mounting member 90. Then, in this state, the UV-curable adhesive 50 is applied over the edge of the incident-side polarizing plate mounting plate 94 and the 12 incident-side polarizing plates near the edge. Then, the incident side polarizing plate 12 and the other of the outer mounting members 90 are bonded and fixed by curing the adhesive 50.
[0047]
Further, the other short side portion 1402 (the short side portion opposite to the reference side 1402A) of the emission side polarizing plate 14 is attached to the other outer mounting member 90. That is, the short side 1402 contacts the inner surface 9204 of the outer mounting member 90 while the lower surface of the output polarizing plate 14 is in contact with the upper surface of the output polarizing plate mounting plate 96 of the outer mounting member 90. Then, in this state, the UV-curable adhesive 50 is applied to the edge of the emission-side polarizing plate mounting plate 96 and the 14 locations of the emission-side polarizing plate near the edge. Then, by curing the adhesive 50, the emission-side polarizing plate 14 and the other outer mounting member 90 are bonded and fixed.
Thus, the incident-side polarizing plate 12 faces the light incident surface 1602 with a gap D1 therebetween, and the emission-side polarizing plate 14 faces the light emitting surface 1604 with a gap D2. Are arranged as follows.
Then, the projections 86 of the two inner members 80 are guided by the guide grooves 9202 of the two outer members 90, so that the transmission type light modulation element 16 is moved in the thickness direction of the transmission type light modulation element 16 ( (Light transmission direction).
Therefore, with the position of the transmissive light modulation element 16 adjusted so that the gaps D1 and D2 have desired dimensions, the protrusions 86 of the two inner members 80 and the guide grooves 9202 of the two outer members 90 An adhesive is applied and fixed between them.
Thereby, as shown in FIG. 14, both short sides of the incident side polarizing plate 12, the transmission type light modulation element 16, and the exit side polarizing plate 14 facing each other are attached to the two outer mounting members 90. .
The light modulation element unit 10 is easily assembled as described above.
[0048]
The attachment of the light modulating element unit 10 to the cross dichroic prism 122 is the same as that of the first embodiment, and as shown in FIG. (The rear surface portion 122B and the other side surface portion 122C), the mounting protrusions 62 are inserted into the mounting holes 8102, and the light modulation element unit 10 and one side surface portion 122A (the rear surface portion 122B and the other side surface portion 122C) are formed. After the positioning is performed, the gap between each of the mounting holes 8102 and the mounting protruding piece 62 is filled with an adhesive and cured to be mounted on the cross dichroic prism 122.
[0049]
Next, functions and effects of the light modulation element unit 10 and the projection display device 100 will be described.
1) A gap D1 is formed between the light incident surface 1602 of the transmission type light modulation device 16 and the incident side polarizing plate 14, and the light emission surface 1604 of the transmission type light modulation device 16 and the light emission surface Since the gap D2 is formed between the side polarizing plate 14, the duct through which air flows is formed by the gaps D1 and D2. Therefore, even if the temperature of the transmission type light modulation element 16 rises due to the light flux from the light source 104 being incident or the transmission type light modulation element 16 being driven, this heat flows through the duct. Is quickly dissipated by the air.
Therefore, it is advantageous in suppressing a rise in the temperature of the transmissive light modulation element 16, and is advantageous in ensuring image quality.
Further, as shown in FIGS. 13A and 13B, the position of the transmission type light modulation element 16 can be adjusted to an arbitrary height position from the uppermost position to the lowermost position, so that the air flowing through the gaps D1 and D2 can be adjusted. The ratio between the gaps D1 and D2 can be set so that the heat radiation effect by the flow can be obtained most, which is advantageous in suppressing the temperature rise of the transmissive light modulation element 16 and advantageous in securing image quality. Become.
2) In the light modulation element unit 10, the transmission axis 1608 on the light incident side of the transmission type light modulation element 16 is parallel to the reference surface 8206A of the inner mounting member 80, and the transmission axis 1610 on the light emission side is The polarization axis 1204 of the incident side polarizing plate 12 is perpendicular to the reference plane 8206A of the inner mounting member 80, is parallel to the reference plane 9204A of the outer mounting member 90, and is the polarization axis 1404 of the emission side polarizing plate 14. Is orthogonal to the reference surface 9204A of the outer mounting member 90.
Here, since the reference planes 8206A and 9204 are parallel to each other, the polarization axis 1204 of the incident-side polarizer 12 and the polarization axis 1404 of the output-side polarizer 14 form a first predetermined angle of 90 degrees with each other. The transmission axis 1608 on the light incident side of the liquid crystal and the polarization axis 1204 of the incident side polarizing plate 12 are parallel to each other, and the transmission axis 1610 on the light exit side of the liquid crystal and the exit side polarizing plate. The 14 polarization axes 1404 will be parallel to each other.
Therefore, the transmission axis of the liquid crystal of the transmission-type light modulation element 16 and the polarization axis of the incident-side polarizing plate 12 are adjusted so as to be in an optimal state for securing the contrast of the image formed by the light modulation element unit 10. Since the relative alignment with the polarization axis of the side polarizing plate 14 is performed, it is advantageous in improving the quality of an image formed by the light modulation element unit 10.
The relative alignment between the transmission axis of the liquid crystal of the transmission type light modulation element 16, the polarization axis of the incident side polarization plate 12, and the polarization axis of the emission side polarization plate 14 is determined by the transmission type light modulation element 16 and the incident side. Since the polarizing plate 12 and the output-side polarizing plate 14 can be easily mounted simply by attaching them to the two mounting members 70, it is advantageous in reducing the assembly cost.
3) The two inner mounting members 80 are formed of a material having thermal conductivity, and a sealing material 52 having thermal conductivity is provided in a space K secured between the inner mounting members 80 and the transmission type light modulation element 16. Since the filling is performed, even if the temperature of the transmission type light modulation element 16 rises, this heat is quickly transmitted to the inner mounting member 80 via the sealing material 52 and is radiated.
Therefore, it is advantageous in suppressing a rise in the temperature of the transmissive light modulation element 16, and is advantageous in ensuring image quality.
4) Since the mounting members 70 at both ends of the transmission type light modulation element 16 are separated from each other, the transmission type light modulation element 16 is hardly affected by a difference in thermal expansion from the mounting member 70.
Therefore, the transmissive light modulation element 16 is prevented from being deformed due to a stress due to a difference in thermal expansion between the transmissive light modulation element 16 and another member supporting the transmissive light modulation element 16, and the image displayed on the transmissive light modulation element 16 is shaded This is advantageous in ensuring image quality without causing unevenness.
5) The light modulation element unit 10 is integrally formed by attaching both sides of the incident-side polarization plate 12, the transmission-type light modulation element 16, and the emission-side polarization plate 14 to the mounting member 70, respectively. When the light modulation element unit 10 is mounted on a member to be mounted, such as the cross dichroic prism 122, the light modulation element unit 10 may be positioned and mounted. This is advantageous in reducing the assembly cost as compared with the case where each of the mold light modulation element 16 and the emission-side polarizing plate 14 is independently positioned.
[0050]
Next, a fourth embodiment will be described.
The fourth embodiment differs from the third embodiment in that a transparent substrate made of sapphire is used as the first dustproof glass 22A.
As in the second embodiment, sapphire has excellent cooling performance. Therefore, by using a transparent substrate made of sapphire as the first dust-proof glass 22A, the temperature rise of the transmission-type light modulation element 16 can be more effectively prevented. Can be expected to be suppressed.
However, since sapphire has optical anisotropy, the C axis of the transparent substrate made of sapphire, the transmission axes 1608 and 1610 of the liquid crystal of the transmission type light modulation element 16, the polarization axis 1204 of the incident side polarizing plate 12, It is necessary to make the relative positional relationship between the exit side polarizing plate 14 and the polarization axis 1604 such that the birefringence does not occur.
Hereinafter, the light modulation element unit that prevents the occurrence of such birefringence will be described.
[0051]
FIG. 15 is an exploded perspective view of a transmission type light modulation element according to the fourth embodiment, and FIG. 16 is a sectional front view of the transmission type light modulation element.
As shown in FIG. 14, in the fourth embodiment, a transparent substrate made of sapphire is used as the first dustproof glass 22A.
The first dustproof glass 22A is formed in a rectangular plate shape, and one of the short sides 2202 facing each other is used as a reference side 2202A so that its C axis 2204 is either parallel or orthogonal to the reference side 2202A. It is configured. In the present embodiment, the C-axis 2204 is configured to be parallel to the reference side 2202A.
When assembling the light modulating element unit 10, the first dustproof glass 22A was removed from the TFT substrate 18, the counter substrate 20, the first dustproof glass 22A, and the second dustproof glass 24 that constitute the transmission type light modulating element 16. Only the TFT substrate 18, the opposing substrate 20, and the second dustproof glass 24 are overlapped and adhered, and the parting member 30 is fixed to the lower surface of the second dustproof glass 24 with an adhesive 50.
[0052]
Next, as shown in FIG. 16, the reference side 1606A of the transmissive light modulation element 16 in a state where the parting member 30 is attached and the first dustproof glass 22 is not attached is attached to the one inner mounting member 80. The reference surface 1802 is inserted into the accommodation recess 82 so that the reference surface 1802 contacts the reference surface 8206A. Thereby, the transmission axes 1602 and 1604 of the liquid crystal of the transmission type light modulation element 16 are positioned so as to be parallel and perpendicular to the reference plane 8206A, respectively. In the positioned state, an adhesive is applied over the end surface of the reference side 1606A and the reference surface 8206A.
[0053]
Next, the first dustproof glass 22A is placed on the upper surface of the counter substrate 20, and the reference side 2202A of the first dustproof glass 22A is brought into contact with the reference surface 8206A. Thereby, the C-axis 2204 of the first dustproof glass 22A is positioned so as to be parallel to the reference surface 8206A. In the positioned state, an adhesive is applied between the lower surface of the first dustproof glass 22A and the upper surface of the counter substrate 20, and the adhesive is applied between the end surface of the reference side 2202A and the reference surface 8206A. Apply.
Then, by curing the adhesive 50, the first and second dustproof glasses 22A and 24, the TFT substrate 18, and the counter substrate 20 constituting the transmission type light modulation element 16 are integrally formed, and The reference side 1606A portion of the pattern light modulation element 16 and one inner mounting member 80 are bonded and fixed.
Hereinafter, in the same procedure as in the third embodiment, the other inner mounting member 80 is attached to the transmission-type light modulation element 16, and then the incident-side polarizing plate 12, the transmission-type light modulation element 16, and the emission-side The light modulating element unit 10 is assembled by attaching both opposing sides of the polarizing plate 14 to the two outer mounting members 80, respectively, and the light modulating element unit 10 is attached to the cross dichroic prism 122.
[0054]
According to the light modulation element unit 10 and the projection display device 100 of the fourth embodiment configured as described above, the following operation and effect can be obtained in addition to the operation and effect of the third embodiment. Can be.
That is, in the light modulation element unit 10, the C axis 2204 of the first dustproof glass 22A is parallel to the reference plane 8206A of the mounting member 40, and the polarization axis 1204 of the incident side polarizing plate 12 is And the polarization axis 1202 of the incident side polarizing plate 12 of the transmission type light modulation element 16 is parallel to the reference surface 4406A of the mounting member 40.
Therefore, the C axis 2204 of the first dustproof glass 22A, the polarization axis 1204 of the incident side polarizing plate 12, the polarization axis 1604 of the exit side polarizing plate 14, and the transmission axis 1608 of the liquid crystal of the transmission type light modulation element 16 are set. Both have a parallel positional relationship, and the occurrence of birefringence by the first dustproof glass 22A can be prevented.
Thus, the first dust-proof glass made of sapphire having high thermal conductivity can effectively dissipate the heat of the transmissive light modulation element 16, which is advantageous in securing image quality.
The relative positioning of the C axis 2204 of the first dustproof glass 22A, the polarization axis 1204 of the incident side polarizing plate 12, and the incident side transmission axis 1608 of the transmissive light modulator 16 is determined by the first dustproof glass. 22A, the transmission type light modulating element 16 except for the first dustproof glass 22A, the incident side polarizing plate 12, and the emitting side polarizing plate 14 can be easily mounted simply by attaching them to the two mounting members 40. This is advantageous in reducing
Instead of using sapphire as the first dustproof glass, sapphire may be used as the second dustproof glass, or sapphire may be used for both the first and second dustproof glasses.
In addition, the reference side of the first or second dustproof glass using the sapphire is brought into contact with the reference surface 8206A of the accommodating recess 82 to perform the positioning of the C axis, instead of the first or second dustproof glass. The transmission-type light modulation element 16 is configured with the C-axis positioned with respect to the transmission axis of the liquid crystal of the transmission-type light modulation element 16, and the reference of the transmission-type light modulation element 16 is set as in the first embodiment. The side of the side 1606A may be configured to abut on the reference plane 8206A to perform relative positioning between the polarization axis and the transmission axis and the C axis.
[0055]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a light modulation unit, a projection display device, and a light modulation unit assembling method that are advantageous in reducing assembly costs.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a configuration of a projection display device according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view illustrating a configuration of a light modulation element unit according to the first embodiment.
FIG. 3 is a perspective view showing an assembled state of a light modulation element unit.
FIG. 4 is a perspective view of a mounting member.
FIG. 5 is a sectional front view of a light modulation element unit.
FIG. 6 is a perspective view showing an attached state of a light modulation element unit.
FIG. 7 is a perspective view showing a modification of the attachment member.
FIG. 8 is an exploded perspective view of a transmission type light modulation element according to a second embodiment.
FIG. 9 is a sectional front view of the transmission type light modulation element.
FIG. 10 is an exploded perspective view illustrating a configuration of a light modulation element unit according to a third embodiment.
FIG. 11 is a perspective view of an inner mounting member.
FIG. 12 is a sectional front view of a light modulation element unit.
13A is a diagram illustrating a state in which the inner mounting member of the light modulation element unit is located at the highest position, and FIG. 13B is a diagram illustrating a state in which the inner mounting member of the light modulation element unit is positioned at the lowest position. FIG.
FIG. 14 is a perspective view showing an attached state of a light modulation element unit.
FIG. 15 is an exploded perspective view of a transmission type light modulation element according to a fourth embodiment.
FIG. 16 is a sectional front view of the transmission type light modulation element.
[Explanation of symbols]
100 Projection-type display device, 10 Light-modulating element unit, 12 Input-side polarizing plate, 14 Output-side polarizing plate, 16 Transmission-type light modulation element, 1602 Light-incident surface, 1604 .. Light emitting surface, 40 mounting member, 70 mounting member, 80 inner mounting member, 90 outer mounting member.

Claims (10)

板状を呈し厚さ方向の一方に光が入射する光入射面が形成され、厚さ方向の他方に前記入射した光が出射する光出射面が形成された矩形板状の透過型光変調素子と、
矩形板状の入射側偏光板と、
矩形板状の出射側偏光板と、
２つの取付部材とを備え、
前記透過型光変調素子の前記光入射面に前記入射側偏光板が隙間を空けて対向し、かつ、前記透過型光変調素子の前記光出射面に前記出射側偏光板が隙間を空けて対向した状態で、これら入射側偏光板、透過型光変調素子、出射側偏光板の両側の辺部分がそれぞれ前記取付部材に取着されている、
ことを特徴とする光変調素子ユニット。A rectangular plate-shaped transmission type light modulation element having a plate-like shape, a light incident surface on which light is incident on one side in a thickness direction, and a light exit surface on which the incident light is emitted is formed on the other side in the thickness direction. When,
A rectangular plate-shaped incident-side polarizing plate;
An output-side polarizing plate having a rectangular plate shape;
With two mounting members,
The incident-side polarizing plate faces the light incident surface of the transmission-type light modulation element with a gap, and the emission-side polarization plate faces the light emission surface of the transmission-type light modulation element with a gap. In this state, these incident-side polarizers, transmission-type light modulation elements, and side portions on both sides of the output-side polarizer are attached to the mounting members, respectively.
A light modulation element unit characterized by the above-mentioned. 光源からの光を光変調素子ユニットにより映像信号に基づいて光変調することにより映像を形成し、前記光変調素子ユニットにより形成された前記映像を投射する投射型表示装置において、
前記光変調素子ユニットは、
板状を呈し厚さ方向の一方に光が入射する光入射面が形成され、厚さ方向の他方に前記入射した光が出射する光出射面が形成された矩形板状の透過型光変調素子と、
矩形板状の入射側偏光板と、
矩形板状の出射側偏光板と、
２つの取付部材とを備え、
前記透過型光変調素子の前記光入射面に前記入射側偏光板が隙間を空けて対向し、かつ、前記透過型光変調素子の前記光出射面に前記出射側偏光板が隙間を空けて対向した状態で、これら入射側偏光板、透過型光変調素子、出射側偏光板の両側の辺部分がそれぞれ前記取付部材に取着されている、
ことを特徴とする投射型表示装置。In a projection display device that forms an image by light-modulating light from a light source based on an image signal by a light modulation element unit and projects the image formed by the light modulation element unit,
The light modulation element unit,
A rectangular plate-shaped transmission type light modulation element having a plate-like shape, a light incident surface on which light is incident on one side in a thickness direction, and a light exit surface on which the incident light is emitted is formed on the other side in the thickness direction. When,
A rectangular plate-shaped incident-side polarizing plate;
An output-side polarizing plate having a rectangular plate shape;
With two mounting members,
The incident-side polarizing plate faces the light incident surface of the transmission-type light modulation element with a gap, and the emission-side polarization plate faces the light emission surface of the transmission-type light modulation element with a gap. In this state, these incident-side polarizers, transmission-type light modulation elements, and side portions on both sides of the output-side polarizer are attached to the mounting members, respectively.
A projection type display device characterized by the above-mentioned. 前記各取付部材には、前記入射側偏光板、前記透過型光変調素子、前記出射側偏光板をそれぞれ収容する入射側偏光板収容凹部、透過型光変調素子収容凹部、出射側偏光板収容凹部が設けられ、前記入射側偏光板、前記透過型光変調素子、前記出射側偏光板の前記取付部材への取着は、これらの辺部分が前記入射側偏光板収容凹部、透過型光変調素子収容凹部、出射側偏光板収容凹部に収容され接着剤による接着でなされていることを特徴とする請求項１記載の光変調素子ユニットまたは請求項２記載の投射型表示装置。In each of the mounting members, the incident-side polarizing plate, the transmission-type light modulation element, the incident-side polarization plate housing recess for accommodating the emission-side polarization plate, the transmission-type light modulation element housing recess, and the emission-side polarization plate housing recess, respectively. The incident-side polarizing plate, the transmission-type light modulation element, and the emission-side polarization plate are attached to the mounting member. The light modulation element unit according to claim 1 or the projection type display device according to claim 2, wherein the light modulation element unit is housed in the housing recess and the emission side polarizing plate housing recess and is bonded by an adhesive. 前記各取付部材には、前記入射側偏光板、前記透過型光変調素子、前記出射側偏光板をそれぞれ収容する入射側偏光板収容凹部、透過型光変調素子収容凹部、出射側偏光板収容凹部が設けられ、前記入射側偏光板、前記透過型光変調素子、前記出射側偏光板の前記取付部材への取着は、これらの辺部分が前記入射側偏光板収容凹部、透過型光変調素子収容凹部、出射側偏光板収容凹部に収容され接着剤による接着でなされ、記２つの取付部材のうち一方の取付部材の入射側偏光板収容凹部の底面および出射側偏光板収容凹部の底面が基準面とされ、前記入射側偏光板の前記両側の辺部分のうち一方の辺部分を前記入射側偏光板収容凹部の基準面に当接し、かつ、前記出射側偏光板の前記両側の辺部分のうち一方の辺部分を前記出射側偏光板収容凹部の基準面に当接した状態でこれら入射側偏光板と出射側偏光板が前記取付部材に取着され、この状態で前記入射側偏光板と出射側偏光板をその厚さ方向から見たときに、前記入射側偏光板の偏光軸と前記出射側偏光板の偏光軸とが０度または９０度の角度をもって配置されることを特徴とする請求項１記載の光変調素子ユニットまたは請求項２記載の投射型表示装置。In each of the mounting members, the incident-side polarizing plate, the transmission-type light modulation element, the incident-side polarization plate housing recess for accommodating the emission-side polarization plate, the transmission-type light modulation element housing recess, and the emission-side polarization plate housing recess, respectively. The incident-side polarizing plate, the transmission-type light modulation element, and the emission-side polarization plate are attached to the mounting member. The bottom of the receiving-side polarizing plate housing recess and the bottom of the emitting-side polarizing plate housing recess of one of the two mounting members are used as a reference. Surface, and one of the side portions on the both sides of the incident-side polarizing plate abuts against the reference surface of the incident-side polarizing plate housing recess, and the both side portions of the output-side polarizing plate One of the sides is covered with the output side polarizing plate. The incident-side polarizing plate and the outgoing-side polarizing plate are attached to the mounting member in a state in which they are in contact with the reference surface of the concave portion. In this state, the incident-side polarizing plate and the outgoing-side polarizing plate are viewed from the thickness direction. 2. The light modulation element unit according to claim 1, wherein the polarization axis of the incident-side polarization plate and the polarization axis of the emission-side polarization plate are arranged at an angle of 0 degree or 90 degrees. 3. The projection display device according to 2. 前記各取付部材には、前記入射側偏光板、前記透過型光変調素子、前記出射側偏光板をそれぞれ収容する入射側偏光板収容凹部、透過型光変調素子収容凹部、出射側偏光板収容凹部が設けられ、前記入射側偏光板、前記透過型光変調素子、前記出射側偏光板の前記取付部材への取着は、これらの辺部分が前記入射側偏光板収容凹部、透過型光変調素子収容凹部、出射側偏光板収容凹部に収容され接着剤による接着でなされ、前記入射側偏光板収容凹部、透過型光変調素子収容凹部、出射側偏光板収容凹部が設けられた箇所と反対側の前記取付部材の箇所に放熱用フィンが設けられていることを特徴とする請求項１記載の光変調素子ユニットまたは請求項２記載の投射型表示装置。In each of the mounting members, the incident-side polarizing plate, the transmission-type light modulation element, the incident-side polarization plate housing recess for accommodating the emission-side polarization plate, the transmission-type light modulation element housing recess, and the emission-side polarization plate housing recess, respectively. The incident-side polarizing plate, the transmission-type light modulation element, and the emission-side polarization plate are attached to the mounting member. The receiving recess, the receiving-side polarizing plate receiving recess, the receiving-side polarizing plate receiving recess, the transmission-type light modulation element receiving recess, and the output-side polarizing plate receiving recess are housed in an adhesive. 3. The light modulation element unit according to claim 1, wherein a radiating fin is provided at a position of the mounting member. 前記各取付部材は内側取付部材と外側取付部材とで構成され、前記内側取付部材には、前記透過型光変調素子を収容する透過型光変調素子収容凹部が設けられ、前記透過型光変調素子は、その両側の辺部分が前記透過型光変調素子収容凹部に収容され接着剤により接着され、前記入射側偏光板、前記透過型光変調素子、前記出射側偏光板の前記取付部材への取着は、前記入射側偏光板の両側の辺部分および前記内側取付部材ならびに前記出射側偏光板の両側の辺部分がそれぞれ前記外側取付部材に取着されることでなされていることを特徴とする請求項１記載の光変調素子ユニットまたは請求項２記載の投射型表示装置。Each of the mounting members includes an inner mounting member and an outer mounting member, and the inner mounting member is provided with a transmissive light modulation element accommodating recess for accommodating the transmissive light modulation element. The side portions on both sides thereof are accommodated in the transmission type light modulation element accommodating recess and adhered by an adhesive, and the incident side polarizing plate, the transmission type light modulation element, and the output side polarization plate are attached to the mounting member. The attachment is performed by attaching both sides of the incident-side polarizing plate, the inside mounting member, and both sides of the emission-side polarizing plate to the outside mounting member, respectively. The light-modulating element unit according to claim 1 or the projection display device according to claim 2. 前記各取付部材は内側取付部材と外側取付部材とで構成され、前記内側取付部材には、前記透過型光変調素子を収容する透過型光変調素子収容凹部が設けられ、前記透過型光変調素子は、その両側の辺部分が前記透過型光変調素子収容凹部に収容され接着剤により接着され、前記入射側偏光板、前記透過型光変調素子、前記出射側偏光板の前記取付部材への取着は、前記入射側偏光板の両側の辺部分および前記内側取付部材ならびに前記出射側偏光板の両側の辺部分がそれぞれ前記外側取付部材に取着されることでなされ、前記内側取付部材は前記外側取付部材に対して前記透過型光変調素子の厚さ方向に位置調節可能に取着されていることを特徴とする請求項１記載の光変調素子ユニットまたは請求項２記載の投射型表示装置。Each of the mounting members includes an inner mounting member and an outer mounting member, and the inner mounting member is provided with a transmissive light modulation element accommodating recess for accommodating the transmissive light modulation element. The side portions on both sides thereof are accommodated in the transmission type light modulation element accommodating recess and adhered by an adhesive, and the incident side polarizing plate, the transmission type light modulation element, and the output side polarization plate are attached to the mounting member. The attachment is performed by attaching both sides of the incident-side polarizing plate and both sides of the inner mounting member and both sides of the output-side polarizing plate to the outer mounting member, and the inner mounting member is The light modulating element unit according to claim 1 or the projection type display apparatus according to claim 2, wherein the light modulating element unit is attached to an outer mounting member so as to be adjustable in a thickness direction of the transmissive light modulating element. . 前記各取付部材は内側取付部材と外側取付部材とで構成され、前記内側取付部材には、前記透過型光変調素子を収容する透過型光変調素子収容凹部が設けられ、前記透過型光変調素子は、その両側の辺部分が前記透過型光変調素子収容凹部に収容され接着剤により接着され、前記入射側偏光板、前記透過型光変調素子、前記出射側偏光板の前記取付部材への取着は、前記入射側偏光板の両側の辺部分および前記内側取付部材ならびに前記出射側偏光板の両側の辺部分がそれぞれ前記外側取付部材に取着されることでなされ、前記２つの外側取付部材のうち一方の外側取付部材には、前記入射側偏光板取付用基準面および前記出射側偏光板取付用基準面が設けられ、前記入射側偏光板の前記両側の辺部分のうち一方の辺部分を前記入射側偏光板取付用基準面に当接し、かつ、前記出射側偏光板の前記両側の辺部分のうち一方の辺部分を前記出射側偏光板取付用基準面に当接した状態でこれら入射側偏光板と出射側偏光板が前記外側取付部材に取着され、この状態で前記入射側偏光板と出射側偏光板をその厚さ方向から見たときに、前記入射側偏光板の偏光軸と前記出射側偏光板の偏光軸とが０度または９０度の角度をもって配置されることを特徴とする請求項１記載の光変調素子ユニットまたは請求項２記載の投射型表示装置。Each of the mounting members includes an inner mounting member and an outer mounting member, and the inner mounting member is provided with a transmissive light modulation element accommodating recess for accommodating the transmissive light modulation element. The side portions on both sides thereof are accommodated in the transmission type light modulation element accommodating recess and adhered by an adhesive, and the incident side polarizing plate, the transmission type light modulation element, and the output side polarization plate are attached to the mounting member. Attachment is performed by attaching sides on both sides of the incident-side polarizing plate, the inside mounting member, and sides on both sides of the emission-side polarizing plate to the outside mounting member, respectively, and the two outside mounting members are attached. One of the outer mounting members is provided with the incident-side polarizing plate mounting reference surface and the emission-side polarizing plate mounting reference surface, and one side portion of the two side portions of the incident side polarizing plate. The incident side polarizing plate The incident-side polarizing plate and the light-exiting plate are brought into contact with each other in a state in which the light-exiting-side polarizing plate is in contact with the attaching reference surface, and one of the two side portions of the light-exiting-side polarizing plate is in contact with the light-exiting-side polarizing plate mounting reference surface. A side polarizing plate is attached to the outer mounting member, and in this state, when the incident side polarizing plate and the emitting side polarizing plate are viewed from the thickness direction, the polarization axis of the incident side polarizing plate and the emission side polarized light are determined. The light modulation element unit according to claim 1 or the projection display apparatus according to claim 2, wherein the polarization axis of the plate is arranged at an angle of 0 degree or 90 degrees. 前記透過型光変調素子はその光入射面または光出射面を構成する透明基板を有し、前記透明基板は異方性を有し複屈折を生じるサファイアで構成され、前記入射側偏光板と出射側偏光板と前記透過型光変調素子とが前記２つの取付部材に取着された状態で、入射側偏光板と出射側偏光板をその厚さ方向から見たときに、前記入射側偏光板の偏光軸と前記出射側偏光板の偏光軸とが０度または９０度をなし、かつ、前記透明基板に臨む前記入射側偏光板または出射側偏光板の偏光軸と前記透明基板のＣ軸とが０度をなすことを特徴とする請求項１記載の光変調素子ユニットまたは請求項２記載の投射型表示装置。The transmission type light modulation element has a transparent substrate constituting a light incident surface or a light exit surface thereof, and the transparent substrate is made of sapphire having anisotropy and generating birefringence. When the incident-side polarizing plate and the emitting-side polarizing plate are viewed from the thickness direction in a state where the side polarizing plate and the transmission-type light modulation element are attached to the two mounting members, the incident-side polarizing plate is formed. And the polarization axis of the output-side polarizing plate forms 0 degree or 90 degrees, and the polarization axis of the incident-side or output-side polarizing plate facing the transparent substrate and the C-axis of the transparent substrate. The light modulating element unit according to claim 1 or the projection type display device according to claim 2, wherein the angle is 0 degree. 光入射窓が形成された入射側見切り板と、光出射窓が形成され前記入射側見切り板に対向する出射側見切り板とを有する見切り部材をさらに有し、前記光入射面を前記入射窓に臨ませるとともに前記光出射面を前記出射窓に臨ませて前記入射側見切り板と出射側見切り板とに前記透過型光変調素子が挟まれた状態で該透過型光変調素子が前記見切り部材に取着されてほぼ矩形板状の見切り部材一体型透過型光変調素子が構成され、前記透過型光変調素子の前記取付部材への取着は、前記見切り部材一体型透過型光変調素子の対向する２辺部分が前記取付部材に取着されることでなされていることを特徴とする請求項１記載の光変調素子ユニットまたは請求項２記載の投射型表示装置。An incident side parting plate having a light incident window formed thereon, and a parting member having an emission side parting plate having a light exit window formed and facing the incident side parting plate, further comprising a light incident surface provided on the incident window. The transmission type light modulation element is disposed on the parting member in a state where the transmission type light modulation element is sandwiched between the incident side parting plate and the emission side parting plate with the light exit surface facing the exit window while facing. The transmission type light modulation element integrated with a parting member having a substantially rectangular plate shape is attached, and the transmission type light modulation element is attached to the mounting member by opposing the transmission type light modulation element integrated with the parting member. The light modulating element unit according to claim 1 or the projection type display device according to claim 2, wherein the two side portions are attached to the mounting member.
JP2003014821A 2003-01-23 2003-01-23 Optical modulator unit and projection type display device Pending JP2004226716A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106054427A (en) * 2015-04-06 2016-10-26 精工爱普生株式会社 Electro-optic module and electronic apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106054427A (en) * 2015-04-06 2016-10-26 精工爱普生株式会社 Electro-optic module and electronic apparatus
JP2016197195A (en) * 2015-04-06 2016-11-24 セイコーエプソン株式会社 Electro-optic module and electronic apparatus

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