JP4212500B2 - Projection display device - Google Patents

Projection display device Download PDF

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JP4212500B2
JP4212500B2 JP2004085055A JP2004085055A JP4212500B2 JP 4212500 B2 JP4212500 B2 JP 4212500B2 JP 2004085055 A JP2004085055 A JP 2004085055A JP 2004085055 A JP2004085055 A JP 2004085055A JP 4212500 B2 JP4212500 B2 JP 4212500B2
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light
louver
display device
opening
horizontal
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JP2005274730A (en
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文彦 濱田
明 宮永
正昭 宮本
隆治 安達
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Sanyo Electric Co Ltd
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Description

この発明は、液晶プロジェクタ等の投写型映像表示装置に関する。   The present invention relates to a projection display apparatus such as a liquid crystal projector.

図５は３板式カラー液晶プロジェクタの光学系を示した図である。光源１の発光部２は、超高圧水銀ランプ、メタルハライドランプ、キセノンランプ等から成り、その照射光はパラボラリフレクタ３によって平行光となって出射され、インテグレータレンズ４へと導かれる。   FIG. 5 is a diagram showing an optical system of a three-plate color liquid crystal projector. The light emitting unit 2 of the light source 1 is composed of an ultra-high pressure mercury lamp, a metal halide lamp, a xenon lamp or the like, and the irradiation light is emitted as parallel light by the parabolic reflector 3 and guided to the integrator lens 4.

インテグレータレンズ４は一対のレンズ群４ａ・４ａにて構成されており、個々のレンズ対が光源１から出射された光を液晶ライトバルブ３１，３２，３３の全面へ導くようになっている。インテグレータレンズ４を経た光は、偏光変換装置５によって例えばＳ偏光に統一された後、第１ダイクロイックミラー８へと導かれる。   The integrator lens 4 is composed of a pair of lens groups 4a and 4a, and each pair of lenses guides light emitted from the light source 1 to the entire surface of the liquid crystal light valves 31, 32, and 33. The light that has passed through the integrator lens 4 is unified into, for example, S-polarized light by the polarization conversion device 5 and then guided to the first dichroic mirror 8.

第１ダイクロイックミラー８は、赤色波長帯域の光を透過し、シアン（緑＋青）の波長帯域の光を反射する。第１ダイクロイックミラー８を透過した赤色波長帯域の光は、全反射ミラー９にて反射されて光路を変更される。全反射ミラー９にて反射された赤色光はコンデンサレンズ１０を経て赤色光用の透過型の液晶ライトバルブ３１を透過することによって光変調される。一方、第１ダイクロイックミラー８にて反射したシアンの波長帯域の光は、第２ダイクロイックミラー１１に導かれる。   The first dichroic mirror 8 transmits light in the red wavelength band and reflects light in the cyan (green + blue) wavelength band. The light in the red wavelength band transmitted through the first dichroic mirror 8 is reflected by the total reflection mirror 9 to change the optical path. The red light reflected by the total reflection mirror 9 passes through the condenser lens 10 and passes through the transmissive liquid crystal light valve 31 for red light, and is modulated. On the other hand, the light in the cyan wavelength band reflected by the first dichroic mirror 8 is guided to the second dichroic mirror 11.

第２ダイクロイックミラー１１は、青色波長帯域の光を透過し、緑色波長帯域の光を反射する。第２ダイクロイックミラー１１にて反射した緑色波長帯域の光はコンデンサレンズ１２を経て緑色光用の透過型の液晶ライトバルブ３２に導かれ、これを透過することによって光変調される。また、第２ダイクロイックミラー１１を透過した青色波長帯域の光は、全反射ミラー１４，１６、リレーレンズ１３，１５、及びコンデンサレンズ１７を経て青色光用の透過型の液晶ライトバルブ３３に導かれ、これを透過することによって光変調される。   The second dichroic mirror 11 transmits light in the blue wavelength band and reflects light in the green wavelength band. The light in the green wavelength band reflected by the second dichroic mirror 11 passes through the condenser lens 12 and is guided to the transmissive liquid crystal light valve 32 for green light, and is modulated by being transmitted therethrough. The light in the blue wavelength band that has passed through the second dichroic mirror 11 is guided to the transmissive liquid crystal light valve 33 for blue light through the total reflection mirrors 14 and 16, the relay lenses 13 and 15, and the condenser lens 17. The light is modulated by passing through it.

各液晶ライトバルブ３１，３２，３３は、入射側偏光板３１ａ，３２ａ，３３ａと、一対のガラス基板（画素電極や配向膜を形成してある）間に液晶を封入して成るパネル部３１ｂ，３２ｂ，３３ｂと、出射側偏光板３１ｃ，３２ｃ，３３ｃとを備えて成る。液晶ライトバルブ３１，３２，３３を経ることで変調された変調光（各色映像光）は、ダイクロイックプリズム１８によって合成されてカラー映像光となる。このカラー映像光は、投写レンズ１９によって拡大投写され、スクリーン２０上に投影表示される。   Each of the liquid crystal light valves 31, 32, 33 includes a panel portion 31b, in which liquid crystal is sealed between an incident-side polarizing plate 31a, 32a, 33a and a pair of glass substrates (with pixel electrodes and alignment films formed). 32b, 33b and output side polarizing plates 31c, 32c, 33c. The modulated light (each color video light) modulated by passing through the liquid crystal light valves 31, 32, 33 is synthesized by the dichroic prism 18 to become color video light. The color image light is enlarged and projected by the projection lens 19 and is projected and displayed on the screen 20.

前記光源１の背面側や側面側に位置する図示しない装置筐体には、吸気又は排気用の開口部が形成されている。この開口部には前記光源１からの漏れ光が筐体外に出てしまうのを防止すると共に通気を確保するためのルーバが設けられる。また、排気効率の向上と不要光の遮光の両立を図った投写型映像表示装置が知られている（特許文献１参照）。
特開２００３−２６２９２１号公報 An opening for intake or exhaust is formed in an apparatus housing (not shown) located on the back side or side of the light source 1. The opening is provided with a louver for preventing leakage light from the light source 1 from coming out of the housing and ensuring ventilation. Further, there is known a projection display apparatus that achieves both improvement in exhaust efficiency and shielding of unnecessary light (see Patent Document 1).
Japanese Patent Laid-Open No. 2003-262921

しかしながら、上記ルーバによって十分な遮光性を得ようとすると、隙間が狭くなって排気に対する抵抗が大きくなるため、排気効率が低下する。   However, if a sufficient light-shielding property is obtained by the louver, the clearance becomes narrower and the resistance to the exhaust gas increases, so that the exhaust efficiency decreases.

この発明は、上記の事情に鑑み、排気効率の向上と不要光の遮光の両立が図れる投写型映像表示装置を提供することを目的とする。   SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a projection display apparatus capable of improving exhaust efficiency and blocking unnecessary light.

この発明の投写型映像表示装置は、上記の課題を解決するために、光源から出射された光を映像表示パネルにより変調して投写する投写型映像表示装置において、装置筐体に形成された複数の傾斜片部とルーバ開口とからなるルーバと、当該ルーバよりも外側に配置され、複数の格子開口を有する格子板とを備え、前記傾斜片部の下端とルーバ開口の下端との間の隙間から漏れる水平光は、隣接する格子開口間の格子板の横要素部により遮光されると共に、傾斜片部の下面とルーバ開口の下端との間の隙間から漏れる傾斜片部に沿った平行な光も前記横要素部により遮光されるように構成されていることを特徴とする。   In order to solve the above-described problem, a projection display apparatus according to the present invention is a projection display apparatus that modulates and projects light emitted from a light source by an image display panel. A gap between the lower end of the inclined piece portion and the lower end of the louver opening, the louver comprising the inclined piece portion and the louver opening, and a lattice plate disposed outside the louver and having a plurality of lattice openings. The horizontal light leaking from the light is shielded by the horizontal element portion of the lattice plate between adjacent lattice openings, and is parallel light along the inclined piece portion leaking from the gap between the lower surface of the inclined piece portion and the lower end of the louver opening. Is also configured to be shielded from light by the lateral element portion.

上記の構成においては、前記ルーバの傾斜片部の下端とルーバ開口の下端との間から漏れ光を生じることになるが、前記格子板の各横要素部は各隙間の位置の水平線上に存在するので、各横要素部による遮光が行われることになり、排気効率の向上と不要光の遮光の両立が図れる。   In the above configuration, light leaks from between the lower end of the inclined piece portion of the louver and the lower end of the louver opening, but each lateral element portion of the lattice plate exists on a horizontal line at the position of each gap. Therefore, light shielding by each lateral element portion is performed, and both improvement in exhaust efficiency and light shielding of unnecessary light can be achieved.

前記各横要素部の上面は、そのルーバ側端よりも外側端が上に位置することで傾斜面とされてもよい。これによれば、ルーバから漏れ出た光が各横要素部の上面に反射することにおいて、この反射光を極力装置内側に向けることが可能になり、遮光性が更に向上する。   The upper surface of each of the lateral element portions may be an inclined surface with the outer end positioned above the louver side end. According to this, since the light leaked from the louver is reflected on the upper surface of each lateral element portion, the reflected light can be directed to the inside of the device as much as possible, and the light shielding property is further improved.

以上説明したように、この発明によれば、ルーバ及びこのルーバの外側に位置する格子板を設け、これらの関係を工夫したことにより、前記ルーバからの漏れ光は格子板の各横要素部によって遮られ、排気効率の向上と不要光の遮光の両立が図れるという効果を奏する。   As described above, according to the present invention, the louver and the lattice plate located outside the louver are provided, and the relationship between these is devised so that the leakage light from the louver is caused by each lateral element portion of the lattice plate. There is an effect that both the improvement of the exhaust efficiency and the shielding of unnecessary light can be achieved.

以下、この発明の実施形態の投写型映像表示装置を図１乃至図４に基づいて説明する。なお、この実施形態においては、透過型の液晶表示パネルを３枚用いた液晶プロジェクタとしており、その映像生成光学系については従来例の説明で用いた図５の液晶プロジェクタと同じにしているので、映像生成光学系の説明については省略し、光源１からの漏れ光を遮光する遮光構造について主に説明する。   Hereinafter, a projection display apparatus according to an embodiment of the present invention will be described with reference to FIGS. In this embodiment, the liquid crystal projector uses three transmissive liquid crystal display panels, and the image generation optical system is the same as the liquid crystal projector of FIG. 5 used in the description of the conventional example. The description of the image generation optical system is omitted, and the light blocking structure that blocks the leaked light from the light source 1 will be mainly described.

図１は液晶プロジェクタにおける光源１及び遮光構造を示した斜視図であり、前記光源１や冷却ファン４０などが見えるように装置筐体５０の一部を切り取って示している。   FIG. 1 is a perspective view showing a light source 1 and a light shielding structure in a liquid crystal projector, and a part of an apparatus housing 50 is cut out so that the light source 1 and a cooling fan 40 can be seen.

前記光源１の背面側において通気用（この実施形態では排気用とする）の開口部が形成されている。この開口部の外側には格子板５１が設けられている。また、前記開口部の内側にはルーバ５２が設けられている。ルーバ５２と光源１との間には冷却ファン４０が配置されている。光源１等から発生する熱によって温められた装置内空気は冷却ファン４０によっ吸引され、装置外へと排出される。   An opening for ventilation (in this embodiment, for exhaust) is formed on the back side of the light source 1. A grid plate 51 is provided outside the opening. A louver 52 is provided inside the opening. A cooling fan 40 is disposed between the louver 52 and the light source 1. The inside air heated by the heat generated from the light source 1 and the like is sucked by the cooling fan 40 and discharged outside the device.

図２は前記ルーバ５２と格子板５１との位置関係及び各々の構造を示した断面図である。ルーバ５２は、例えば平板状の鉄板をプレス加工することによって、複数個の傾斜片部５２ａが形成されたものである。この傾斜片部５２ａの形成によってルーバ開口５２ｂが得られるのであるが、このルーバ開口５２ｂの位置に存在していた部分が傾斜させられて前記傾斜片部５２ａとなるため、傾斜片部５２ａの下端での水平線とルーバ開口５２ｂの下端での水平線とは一致せず、両水平線の間には隙間αが存在することになる。   FIG. 2 is a sectional view showing the positional relationship between the louver 52 and the lattice plate 51 and the structure of each. The louver 52 has a plurality of inclined pieces 52a formed by, for example, pressing a flat iron plate. The louver opening 52b is obtained by forming the inclined piece 52a, but the portion existing at the position of the louver opening 52b is inclined to become the inclined piece 52a, so that the lower end of the inclined piece 52a is formed. And the horizontal line at the lower end of the louver opening 52b do not coincide with each other, and a gap α exists between the horizontal lines.

前記格子板５１の各横要素部５１ａは、各隙間αの位置の水平線上に存在し、前記両水平線と交差する縦厚み（高さ）を有している。   Each horizontal element portion 51a of the lattice plate 51 is present on a horizontal line at the position of each gap α, and has a vertical thickness (height) that intersects the horizontal lines.

前記ルーバ５２の傾斜片部５２ａの下端とルーバ開口５２ｂの下端との間（隙間α）から漏れ光を生じるが、前記格子板５１の各横要素部５１ａは各隙間αの位置の水平線上に存在し、前記両水平線と交差する縦厚みを有するので、前記漏れ光は各横要素部５１ａによって遮られることになり、排気効率の向上と不要光の遮光の両立が図れることになる。   Leakage light is generated between the lower end of the inclined piece portion 52a of the louver 52 and the lower end of the louver opening 52b (gap α), but each lateral element portion 51a of the lattice plate 51 is on a horizontal line at the position of each gap α. Since it exists and has a vertical thickness that intersects the two horizontal lines, the leaked light is blocked by each horizontal element portion 51a, so that both exhaust efficiency can be improved and unnecessary light can be blocked.

なお、図２に示した各横要素部５１ａの縦厚みを更に厚くすることにより、前記傾斜片部５２ａの下面の延長線上に前記格子開口５１ｂのルーバ側上端及び外側下端を位置させることができる。かかる構成とする場合には、格子開口５１ｂが幾分狭まるものの、遮光性は更に向上することになる。   In addition, by further increasing the vertical thickness of each horizontal element portion 51a shown in FIG. 2, the louver side upper end and the outer lower end of the lattice opening 51b can be positioned on the extension line of the lower surface of the inclined piece portion 52a. . In the case of such a configuration, although the grating opening 51b is somewhat narrowed, the light shielding property is further improved.

一方、図３に示すように、各横要素部５１ａの上面が、そのルーバ側端よりも外側端が上に位置することで傾斜面とし、これによって、前記傾斜片部５２ａの下面の延長線上に前記格子開口５１ｂのルーバ側上端及び外側下端を位置させることもできる。ここで、ルーバ開口５２ｂから漏れ出て各横要素部５１ａの上面に当たる漏れ光は、当該上面にて反射して格子板５１の外側に出てしまう場合がある。上記のごとく、各横要素部５１ａの上面を傾斜面とすることにより、各横要素部５１ａの上面による反射光を極力装置内側に向けることが可能になり、遮光性が更に向上する。   On the other hand, as shown in FIG. 3, the upper surface of each lateral element portion 51a is inclined with the outer end positioned above the louver side end, thereby extending the lower surface of the inclined piece portion 52a. It is also possible to position the upper end and the outer lower end of the lattice opening 51b on the louver side. Here, the leaked light that leaks from the louver opening 52b and hits the upper surface of each lateral element portion 51a may be reflected by the upper surface and exit to the outside of the lattice plate 51. As described above, by making the upper surface of each horizontal element portion 51a an inclined surface, the reflected light from the upper surface of each horizontal element portion 51a can be directed to the inside of the device as much as possible, and the light shielding property is further improved.

また、図４に示すように、前記格子板５１の各横要素部５１ａの縦厚み（前記両水平線と交差する縦厚み）が当該各横要素部５１ａの外側端で確保されるようになっていてもよい。この図４に示す構成であれば、各横要素部５１ａの上面（傾斜面）の角度を急峻にすることができ、各横要素部５１ａの上面による反射光を装置内側に向けることが確実に行える。   Further, as shown in FIG. 4, the vertical thickness of each horizontal element portion 51a of the lattice plate 51 (vertical thickness intersecting with both horizontal lines) is secured at the outer end of each horizontal element portion 51a. May be. With the configuration shown in FIG. 4, the angle of the upper surface (inclined surface) of each horizontal element portion 51a can be made steep, and the reflected light from the upper surface of each horizontal element portion 51a can be reliably directed to the inside of the apparatus. Yes.

なお、以上説明した例では、透過型の液晶表示パネルを３枚用いた映像生成光学系を示したが、このような映像生成光学系に限るものではなく、他の映像生成光学系を用いる場合にも適用することができる。   In the example described above, an image generation optical system using three transmissive liquid crystal display panels is shown. However, the present invention is not limited to such an image generation optical system, and other image generation optical systems are used. It can also be applied to.

この発明の実施形態の液晶プロジェクタの遮光構造を示した斜視図である。It is the perspective view which showed the light-shielding structure of the liquid crystal projector of embodiment of this invention. ルーバと格子板との位置関係及び各々の構造を示した断面図である。It is sectional drawing which showed the positional relationship and each structure of a louver and a lattice board. ルーバと格子板との位置関係及び各々の構造の他の例を示した断面図である。It is sectional drawing which showed the positional relationship of a louver and a lattice board, and the other example of each structure. ルーバと格子板との位置関係及び各々の構造の他の例を示した断面図である。It is sectional drawing which showed the positional relationship of a louver and a lattice board, and the other example of each structure. 液晶プロジェクタの光学系を例示した説明図である。It is explanatory drawing which illustrated the optical system of the liquid crystal projector.

符号の説明Explanation of symbols

１ 光源
５１ 格子板
５１ａ 横要素部
５１ｂ 格子開口
５２ ルーバ
５２ａ 傾斜片部
５２ｂ ルーバ開口 DESCRIPTION OF SYMBOLS 1 Light source 51 Grid plate 51a Lateral element part 51b Grid opening 52 Louver 52a Inclined piece part 52b Louver opening

Claims (2)

光源から出射された光を映像表示パネルにより変調して投写する投写型映像表示装置において、装置筐体に形成された複数の傾斜片部とルーバ開口とからなるルーバと、当該ルーバよりも外側に配置され、複数の格子開口を有する格子板とを備え、前記傾斜片部の下端とルーバ開口の下端との間の隙間から漏れる水平光は、隣接する格子開口間の格子板の横要素部により遮光されると共に、傾斜片部の下面とルーバ開口の下端との間の隙間から漏れる傾斜片部に沿った平行な光も前記横要素部により遮光されるように構成されていることを特徴とする投写型映像表示装置。 In a projection display apparatus that modulates and projects light emitted from a light source by an image display panel, a louver composed of a plurality of inclined pieces and a louver opening formed in the apparatus housing, and on the outside of the louver The horizontal light leaking from the gap between the lower end of the inclined piece portion and the lower end of the louver opening is arranged by a horizontal element portion of the lattice plate between adjacent lattice openings. In addition to being shielded from light, it is configured so that parallel light along the sloped piece leaking from the gap between the lower surface of the sloped piece and the lower end of the louver opening is also shielded by the lateral element part. Projection-type image display device. 請求項１に記載の投写型映像表示装置において、前記各横要素部の上面は、そのルーバ側端よりも外側端が上に位置することで傾斜面とされたことを特徴とする投写型映像表示装置。 2. The projection image display device according to claim 1, wherein an upper surface of each of the lateral element portions is inclined with an outer end positioned above the louver side end. Display device.
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JP2007206548A (en) * 2006-02-03 2007-08-16 Sharp Corp Light leakage preventive mechanism and electric equipment
JP4204604B2 (en) 2006-05-02 2009-01-07 三洋電機株式会社 Projector device
JP4884159B2 (en) * 2006-10-19 2012-02-29 三洋電機株式会社 Projection display device
JP4931563B2 (en) * 2006-11-24 2012-05-16 三菱電機株式会社 Rear projector
JP5422977B2 (en) * 2008-11-20 2014-02-19 ソニー株式会社 Projection display
JP5805141B2 (en) * 2013-06-07 2015-11-04 株式会社ソニー・コンピュータエンタテインメント Electronics

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