JPH01289912A - Display device - Google Patents
Display deviceInfo
- Publication number
- JPH01289912A JPH01289912A JP63119920A JP11992088A JPH01289912A JP H01289912 A JPH01289912 A JP H01289912A JP 63119920 A JP63119920 A JP 63119920A JP 11992088 A JP11992088 A JP 11992088A JP H01289912 A JPH01289912 A JP H01289912A
- Authority
- JP
- Japan
- Prior art keywords
- wind
- liquid crystal
- plate
- light valve
- polarizing plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001816 cooling Methods 0.000 claims abstract description 42
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims description 15
- 238000009423 ventilation Methods 0.000 claims description 11
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Projection Apparatus (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、液晶ライトバルブにより形成した画像を、投
写レンズにより拡大投写する投写型の表示装置に関する
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a projection type display device that enlarges and projects an image formed by a liquid crystal light valve using a projection lens.
従来は、第７図の光学系ユニット外観側面図に示すよう
に、例えば液晶ライトバルブ３Ｂを平板のガイド板１９
Ｂに取付け、プリズム固定板２゜及び基台２１によって
ガイド板１９Ｂを固定した光学系の下部に、冷却手段２
２を配した光学系ユニットを用いた表示装置が知られて
いた。Conventionally, as shown in the external side view of the optical system unit in FIG.
A cooling means 2 is attached to the lower part of the optical system in which the guide plate 19B is fixed by the prism fixing plate 2° and the base 21.
A display device using an optical system unit equipped with 2 has been known.
しかし、従来の光学系ユニットにおいて、例えば冷却手
段として冷却ファンを吹き付は式として用いた場合、第
８図に矢印で示すように風が生じ、液晶ライトバルブ３
Ｂ、３Ｇに付帯する偏光板の表面を風が流れ、液晶ライ
トバルブ３Ｂ、３Ｇに付帯する偏光板を冷却はするもの
の、第８図からも明らかなように液晶ライトバルブ３Ｂ
、３Ｇに付帯する偏光板の冷却とは関係なく外部に逃げ
る風も多く冷却効率は低レベルのものであった。However, in a conventional optical system unit, when a cooling fan is used as a cooling means, for example, wind is generated as shown by the arrow in FIG.
Although wind flows over the surface of the polarizing plates attached to the liquid crystal light valves 3B and 3G and cools the polarizing plates attached to the liquid crystal light valves 3B and 3G, as is clear from FIG.
, the cooling efficiency was at a low level because there was a lot of wind escaping to the outside, regardless of the cooling of the polarizing plate attached to the 3G.
そこで、この冷却効率において冷却能力を向上するため
には冷却ファンの冷却能力を向上する必要があり、冷却
ファンを大型化しなげればならず、それは表示装置の大
型化につながる。又、冷却ファンを大型化する事な〈従
来の冷却効率において使用する場合、これを原因として
表示装置の出射光束の向上が困難となるという問題点も
有していた。Therefore, in order to improve the cooling capacity in terms of cooling efficiency, it is necessary to improve the cooling capacity of the cooling fan, which requires increasing the size of the cooling fan, which leads to an increase in the size of the display device. In addition, there is a problem in that when the cooling fan is used at a conventional cooling efficiency, it is difficult to increase the output luminous flux of the display device without increasing the size of the cooling fan.
そこで、本発明はこのような問題点を解決するもので、
その目的とするところは、冷却ファンの冷却能力を最大
限に引き出し、軽薄短小にして高出射光束の表示装置を
提供することにある。さらに他の目的は温度に弱い偏光
板を効率よく冷却することである。Therefore, the present invention aims to solve these problems.
The purpose is to maximize the cooling capacity of the cooling fan, and to provide a display device that is light, thin, short, and small and has a high output luminous flux. Yet another purpose is to efficiently cool polarizing plates that are sensitive to temperature.
上記問題点を）１イ決するために、本発明の表示装置は
、光源からの出射光を光学系手段により導き、液晶ライ
トバルブにより画像を形成し、投写レンズにより画像を
拡大投写する表示装置において、液晶ライトバルブの下
部に位置し液晶ライトバルブに係る偏光板の冷却手段を
包含する基台を配し、液晶ライトバルブの位置調整及び
固定を目的とするガイド板に導風構造を設け、その基台
の上部に導風構造と相対位置を成す通風孔を設けた事を
特徴とする。In order to solve the above problem (1), the display device of the present invention is a display device in which light emitted from a light source is guided by an optical system means, an image is formed by a liquid crystal light valve, and the image is enlarged and projected by a projection lens. , a base is arranged below the liquid crystal light valve and includes a cooling means for the polarizing plate related to the liquid crystal light valve, a guide plate is provided for the purpose of adjusting and fixing the position of the liquid crystal light valve, and an air guiding structure is provided. It is characterized by a ventilation hole located at the top of the base in a position relative to the wind guide structure.
上記構成による表示装置において、冷却手段として冷却
ファンを吹き付は式として用いた場合、冷却ファンによ
り生じた風は冷却ファンを包含する基台によって通風孔
に収束し、通風孔を経てガイド板の導風構造によって液
晶ライトバルブに係る偏光板の表面に到達するため、液
晶ライトバルブに係る偏光板□を最大限に冷却する事が
できるのである。In the display device with the above configuration, when a cooling fan is used as a blower as a cooling means, the air generated by the cooling fan is converged on the ventilation hole by the base that includes the cooling fan, and passes through the ventilation hole to the guide plate. Since the air reaches the surface of the polarizing plate associated with the liquid crystal light valve through the guide structure, the polarizing plate □ associated with the liquid crystal light valve can be cooled to the maximum extent possible.
以下に、本発明の実施例を図面に基づいて説明する。第
１図は、本発明の実施例の基本構成な表わす平面図であ
る。第１図において、光源１を出射した光は、光学系手
段の１例である光導波管２内で選択反射特性を有するミ
ラー等により赤、緑、青の３原色に分光されて導かれ、
液晶ライトバルブ３Ｒ，３Ｇ、３Ｂによってそれぞれの
色に対応し電気光学変調を受けた後、プリズム４によっ
て合成され、投写レンズ５によって前方のスクリーン上
に拡大投写される。液晶ライトバルブ３Ｒ，３Ｇ、３Ｂ
は、その確実な固定及び調整のために中央部に窓及び下
方部に導風構造を有するガイド板６Ｒ，６Ｇ、６Ｂにそ
れぞれ取シ付けられて固定される。冷却ファン７は、液
晶ライトバルブ３Ｒ，３Ｇ、３Ｂ及びプリズム４の下部
に取シ付けられ、下部より吹き付は式として液晶ライト
バルブ３Ｒ，３Ｇ、３Ｂに係る偏光板を冷却する。Embodiments of the present invention will be described below based on the drawings. FIG. 1 is a plan view showing the basic configuration of an embodiment of the present invention. In FIG. 1, light emitted from a light source 1 is separated into three primary colors of red, green, and blue and guided by a mirror having selective reflection characteristics within an optical waveguide 2, which is an example of an optical system means.
After receiving electro-optical modulation corresponding to each color by the liquid crystal light valves 3R, 3G, and 3B, the lights are combined by the prism 4, and then enlarged and projected onto the screen in front by the projection lens 5. LCD light bulb 3R, 3G, 3B
are respectively attached and fixed to guide plates 6R, 6G, and 6B having a window in the center and a wind guide structure in the lower part for reliable fixing and adjustment. The cooling fan 7 is attached to the lower part of the liquid crystal light valves 3R, 3G, 3B and the prism 4, and blows air from the lower part to cool the polarizing plates related to the liquid crystal light valves 3R, 3G, 3B.
基台８は、冷却ファン７を完全に包含しうる形状を有し
、その上面にしてガイド板６Ｒ，６Ｇ、６Ｂの導風構造
との相対位置（第１図中の斜線部）に通風孔を有する。The base 8 has a shape that can completely enclose the cooling fan 7, and has ventilation holes on its upper surface at positions relative to the air guide structures of the guide plates 6R, 6G, and 6B (shaded areas in FIG. 1). has.
第２図は、本発明の実施例における光学系ユニットの外
観側面図であり、図中の光軸Ａ−Ａによる縦断面図を第
６図に示す。第３図において、説明は赤色用液晶ライト
バルブ３Ｒ及びその周辺構造についてのみ行うが、構造
的には緑色用液晶ライトバルブ３Ｇ、青色用液晶ライト
バルブ６Ｂの周辺ｉ】１．ｊｙ造についても全く同様で
ある。液晶ライトバルブ３Ｒは、ネジによって液晶ライ
トバルブプレー）１１Ｒに締結され、液晶ライトバルブ
プレー）１１Ｒをネジによってガイド板６Ｒに締結し、
ガイド板６Ｒをネジによってアッププレート１４に締結
することにより保持される。液晶ライトバルブ３Ｒは、
画像表示のためにその前後に偏光板１２Ｒ及び１３Ｒを
配する必要があり、本例においては液晶ライトバルブ６
Ｒに対して光の入射側の偏光板１２Ｒをガイド板６Ｒの
プリズム４側の面に貼り付け、液晶ライトバルブ３Ｒに
対して光の出射側の偏光板１３Ｒをプリズム４に貼りつ
ける。ガイド板６Ｒは中央部に光の入射用の窓１５Ｒを
有し、その下部に導風構造１０Ｒを有する。一方、基台
８は、冷却ファン７を包含するのみならず、アッププレ
ート１４との間でプリズム４を保持し、アッププレート
１４゛に保持されている液晶ライトバルブ３Ｒ及びその
周辺構造を保持する。基台８は又、その上部の導風構造
１０Ｒとの相対位置に通風孔９Ｒを有し、冷却ファン７
によって生じた風をその通風孔９Ｒに収束させる。通風
孔９Ｈに収束した風は真上に吹き上る風と冷却ファン７
の回転中心から外へ逃げようとする風とに別れ、前者は
液晶ライトバルブ３Ｒと出射側偏光板１３Ｒとの間及び
液晶ライトバルブ３Ｒと入射側偏光板１２Ｒとの間を通
り偏光板１２Ｒ，１３Ｂ表面の熱を奪ってアッププレー
ト１４に設けられた穴より上部に吹き抜ける。後者はガ
イド板６Ｒに設けられた導風構造１０Ｒによってその方
向を偏光板１２Ｒ方向に変えられ、ガイド板６Ｒの中央
の光の入射用窓１５Ｒを通って偏光板１２Ｒ表面の熱を
奪い、偏光板１２Ｒによって方向を変えられて外部へ吹
き抜けろ。FIG. 2 is an external side view of the optical system unit according to the embodiment of the present invention, and FIG. 6 is a vertical cross-sectional view taken along the optical axis A-A in the figure. In FIG. 3, only the red liquid crystal light valve 3R and its peripheral structure will be explained, but structurally, the green liquid crystal light valve 3G and the blue liquid crystal light valve 6B and their surroundings i]1. The same is true for jy construction. The liquid crystal light valve 3R is fastened to the liquid crystal light valve plate 11R with screws, and the liquid crystal light valve plate 11R is fastened to the guide plate 6R with screws.
The guide plate 6R is held by fastening to the up plate 14 with screws. LCD light valve 3R is
In order to display an image, it is necessary to arrange polarizing plates 12R and 13R before and after the liquid crystal light valve 6.
A polarizing plate 12R on the light incident side with respect to R is attached to the surface of the guide plate 6R on the prism 4 side, and a polarizing plate 13R on the light output side with respect to the liquid crystal light valve 3R is attached to the prism 4. The guide plate 6R has a window 15R for light incidence in the center, and a wind guiding structure 10R below the window 15R. On the other hand, the base 8 not only includes the cooling fan 7, but also holds the prism 4 between it and the up plate 14, and holds the liquid crystal light valve 3R held by the up plate 14' and its surrounding structure. . The base 8 also has a ventilation hole 9R at a position relative to the upper air guide structure 10R, and a cooling fan 7
The wind generated by this is converged into the ventilation hole 9R. The wind that converges in the ventilation hole 9H blows directly upwards and the cooling fan 7
The former passes between the liquid crystal light valve 3R and the output side polarizing plate 13R, and between the liquid crystal light valve 3R and the input side polarizing plate 12R, and the former passes through the polarizing plate 12R, It takes away the heat from the surface of 13B and blows through the hole provided in the up plate 14 to the upper part. The direction of the latter is changed to the direction of the polarizing plate 12R by the air guiding structure 10R provided on the guide plate 6R, and the light passes through the light entrance window 15R at the center of the guide plate 6R, removes heat from the surface of the polarizing plate 12R, and becomes polarized light. Change direction with plate 12R and blow through to the outside.
これらの風の流れを模式的に表わすと第４図のようにな
る。光の入射側偏光板１２１（はその偏光作用のために
光の熱を約６０％吸収し表面温度が特に上昇するが、上
記のようにその表面と裏面を効率的に冷却することによ
って偏光特性を損うことを防止できる。昨今、軽薄短小
にして高出射光束の表示装置の要求が強まるにつれて、
小型の冷却ファンによって効率よく液晶ライトバルブに
係る偏光板を冷却する本例は益々有効となる。A schematic representation of these wind flows is shown in Figure 4. The light incident side polarizing plate 121 absorbs about 60% of the heat of the light due to its polarizing effect, and its surface temperature increases in particular. However, by efficiently cooling its front and back surfaces as described above, the polarizing properties can be improved. In recent years, as the demand for display devices that are light, thin, short, and have high output luminous flux has increased,
This example of efficiently cooling a polarizing plate related to a liquid crystal light valve using a small cooling fan becomes increasingly effective.
今後益々表示装置の軽薄短小化が進む時、第５図に示す
本例の基台８に変えて、第６図に示すような薄型の基台
１６を用い、液晶ライトバルブの下部から冷却ファン１
８を切り離し、導風管１７によって冷却ファン１８から
の風をレンズ方向から基台１６に送り込むと、本例と同
様な風の流れが考えられ、表示装置の軽薄短小化に非常
に有効である。When display devices become lighter, thinner, and smaller in the future, a thin base 16 as shown in FIG. 6 will be used instead of the base 8 of this example shown in FIG. 5, and a cooling fan will be installed from the bottom of the liquid crystal light valve. 1
8 is separated and the air from the cooling fan 18 is sent from the lens direction to the base 16 using the air guide pipe 17, the same air flow as in this example can be expected, which is very effective in making the display device lighter, thinner, and smaller. .
本発明は、以上説明したように、従来の光学系ユニット
の基本構成を変えずに、その基台を、冷却ファンを包含
し冷却ファンの風を収束する通風孔を有する形状にし、
液晶ライトバルブの固定及び調整のためのガイド板に、
基台の通風孔によって収束した風を偏光板表面に導くた
めの導風構造を設ける事によって、冷却ファンの冷却能
力を最大限に引き出す事が可能となるため、小型の冷却
ファンを用いる事が可能となり、軽薄短小にして高出射
光束の表示装置を実現できるのである。As explained above, the present invention does not change the basic configuration of the conventional optical system unit, but the base is made into a shape that includes a cooling fan and has ventilation holes that converge the cooling fan's wind.
Guide plate for fixing and adjusting the liquid crystal light bulb.
By providing a wind guide structure to guide the air converged by the ventilation holes in the base to the surface of the polarizing plate, it is possible to maximize the cooling capacity of the cooling fan, making it possible to use a small cooling fan. This makes it possible to realize a display device that is light, thin, short, and has a high output luminous flux.
第１図は、本発明の実施例を表わす基本構成図、第２図
は、本発明の実施例における光学系ユニットの外観側面
図、第６図は、第２図における縦断面図、第４図は、風
の流れを表わす模式図、第５図は、本発明の実施例にお
ける基台の模式図、第６図は、別の実施例における基台
及び冷却ファンの構成図、第７図は、従来の光学系ユニ
ットの外観側面図、第８図は、従来の光学系ユニットに
おける風の流れを表わす模式図である。
１・・・・・・・・・光 源
２・・・・・・・・・光導波管
ろＲ＋ ５ Ｇ ＋ ３ Ｂ・・・・・・液晶ライトバ
ルブ４・・・・・・・・・プリズム
５・・・・・・・・・投写レンズ
６Ｒ，６Ｇ、６Ｂ・・・・・・ガイ ド板７・・・・・
・・・・冷却ファン
８・・・・・・・・・基 台
９Ｒ，９Ｂ・・・・・・通風孔
１０Ｒ，１０Ｂ・・・・・・導風構造
１１Ｒ，１１Ｂ・・・・・・液晶ライトバルブプレート
１２’Ｒ，１２Ｂ・・・・・・入射側偏光板１３Ｒ，，
１３Ｂ・・・・・・出射側偏光板１４ ・・・
・・・アッププレート１５Ｒ，１５Ｂ・・・・・・入射
窓
以上
出願人 セイコーエプソン株式会社
代理人 弁理士 上柳雅誉（他１名）
第４図
第５図
第６図
第７図
第８図1 is a basic configuration diagram showing an embodiment of the present invention, FIG. 2 is an external side view of an optical system unit in an embodiment of the present invention, FIG. 6 is a vertical sectional view in FIG. 2, and FIG. 5 is a schematic diagram showing the flow of wind, FIG. 5 is a schematic diagram of a base in an embodiment of the present invention, FIG. 6 is a configuration diagram of a base and a cooling fan in another embodiment, and FIG. 7 1 is an external side view of a conventional optical system unit, and FIG. 8 is a schematic diagram showing the flow of air in the conventional optical system unit. 1...Light source 2...Optical waveguide R+ 5 G+3 B...Liquid crystal light valve 4...・Prism 5...Projection lenses 6R, 6G, 6B...Guide plate 7...
...Cooling fan 8... Base 9R, 9B... Ventilation holes 10R, 10B... Air guide structure 11R, 11B... Liquid crystal light valve plate 12'R, 12B...Incidence side polarizing plate 13R,,
13B... Output side polarizing plate 14...
... Up plate 15R, 15B ... Entrance window or above Applicant Seiko Epson Co., Ltd. Agent Patent attorney Masayoshi Kamiyanagi (1 other person) Figure 4 Figure 5 Figure 6 Figure 7 Figure 8
Claims (1)
トバルブにより画像を形成し、投写レンズにより前記画
像を拡大投写する表示装置において、前記液晶ライトバ
ルブの下部に位置し前記液晶ライトバルブに係る偏光板
の冷却手段を包含する基台を配し、前記液晶ライトバル
ブの位置調整及び固定を目的とするガイド板に導風構造
を設け、前記基台の上部に前記導風構造と相対位置を成
す通風孔を設けた事を特徴とする表示装置。In a display device in which light emitted from a light source is guided by an optical system means, an image is formed by a liquid crystal light valve, and the image is enlarged and projected by a projection lens, the polarized light is located below the liquid crystal light valve and is related to the liquid crystal light valve. A base including a cooling means for the plate is arranged, a guide plate for the purpose of adjusting and fixing the position of the liquid crystal light valve is provided with an air guide structure, and an air guide structure is provided on the upper part of the base in a relative position to the air guide structure. A display device characterized by having ventilation holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63119920A JP2707599B2 (en) | 1988-05-17 | 1988-05-17 | Projection display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63119920A JP2707599B2 (en) | 1988-05-17 | 1988-05-17 | Projection display device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9111472A Division JP3008086B2 (en) | 1997-04-28 | 1997-04-28 | Projection display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01289912A true JPH01289912A (en) | 1989-11-21 |
| JP2707599B2 JP2707599B2 (en) | 1998-01-28 |
Family
ID=14773450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63119920A Expired - Lifetime JP2707599B2 (en) | 1988-05-17 | 1988-05-17 | Projection display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2707599B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04283723A (en) * | 1991-03-12 | 1992-10-08 | Mitsubishi Electric Corp | Liquid crystal display device |
| JPH0868979A (en) * | 1994-08-30 | 1996-03-12 | Casio Comput Co Ltd | Liquid crystal projector |
| JP2005070088A (en) * | 2003-08-22 | 2005-03-17 | Canon Inc | Projection type display device and optical system for projection type display device |
| USRE40296E1 (en) | 1991-02-22 | 2008-05-06 | Seiko Epson Corporation | Projection type liquid crystal projector |
| USRE40450E1 (en) | 1993-10-27 | 2008-08-05 | Seiko Epson Corporation | Liquid crystal projector |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59107378A (en) * | 1982-12-13 | 1984-06-21 | 株式会社東芝 | Liquid crystal display unit |
| JPS6238492A (en) * | 1985-08-14 | 1987-02-19 | 富士通株式会社 | Liquid crystal display unit |
| JPS6346416A (en) * | 1986-08-13 | 1988-02-27 | Sharp Corp | Liquid crystal display device for overhead projector |
| JPS6354137U (en) * | 1986-09-26 | 1988-04-12 | ||
| JPH01105216A (en) * | 1987-10-19 | 1989-04-21 | Toshiba Corp | Liquid crystal display device |
| JPH01128380U (en) * | 1988-02-24 | 1989-09-01 |
-
1988
- 1988-05-17 JP JP63119920A patent/JP2707599B2/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59107378A (en) * | 1982-12-13 | 1984-06-21 | 株式会社東芝 | Liquid crystal display unit |
| JPS6238492A (en) * | 1985-08-14 | 1987-02-19 | 富士通株式会社 | Liquid crystal display unit |
| JPS6346416A (en) * | 1986-08-13 | 1988-02-27 | Sharp Corp | Liquid crystal display device for overhead projector |
| JPS6354137U (en) * | 1986-09-26 | 1988-04-12 | ||
| JPH01105216A (en) * | 1987-10-19 | 1989-04-21 | Toshiba Corp | Liquid crystal display device |
| JPH01128380U (en) * | 1988-02-24 | 1989-09-01 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE40296E1 (en) | 1991-02-22 | 2008-05-06 | Seiko Epson Corporation | Projection type liquid crystal projector |
| USRE42740E1 (en) | 1991-02-22 | 2011-09-27 | Seiko Epson Corporation | Projector |
| JPH04283723A (en) * | 1991-03-12 | 1992-10-08 | Mitsubishi Electric Corp | Liquid crystal display device |
| USRE40450E1 (en) | 1993-10-27 | 2008-08-05 | Seiko Epson Corporation | Liquid crystal projector |
| JPH0868979A (en) * | 1994-08-30 | 1996-03-12 | Casio Comput Co Ltd | Liquid crystal projector |
| JP2005070088A (en) * | 2003-08-22 | 2005-03-17 | Canon Inc | Projection type display device and optical system for projection type display device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2707599B2 (en) | 1998-01-28 |
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