JPH04171480A - Reflector type liquid crystal display panel - Google Patents

Reflector type liquid crystal display panel

Info

Publication number
JPH04171480A
JPH04171480A JP2298203A JP29820390A JPH04171480A JP H04171480 A JPH04171480 A JP H04171480A JP 2298203 A JP2298203 A JP 2298203A JP 29820390 A JP29820390 A JP 29820390A JP H04171480 A JPH04171480 A JP H04171480A
Authority
JP
Japan
Prior art keywords
container
display panel
liquid crystal
crystal display
cooling
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.)
Pending
Application number
JP2298203A
Other languages
Japanese (ja)
Inventor
Ryuichi Takano
隆一 高野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP2298203A priority Critical patent/JPH04171480A/en
Publication of JPH04171480A publication Critical patent/JPH04171480A/en
Pending legal-status Critical Current

Links

Landscapes

  • Liquid Crystal (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

PURPOSE:To increase the cooling effect of a display panel and obtain a projection image plane of high luminance by fitting a cooler, provided with a heat pipe inserted into a container containing cooling liquid in order to radiate heat absorbed by the cooling liquid outside the container, to the back face of a reflector type liquid crystal display panel. CONSTITUTION:A cooling container 9 fitted to the back face of a display panel 4 is a thin box like container of sealed structure made of metal such as aluminum of high heat conductivity, and cooling liquid is filled inside. A heat pipe 10 inserted into this container 9 is inserted in the upper part of the container 9 in the state of both end sides of the heat pipe 10 protruding outward from both side faces of the container 9 so as to radiate heat absorbed by the cooling liquid outside the container 9. Radiating fins 11 are provided at radiating parts. The temperature rise of a display panel can be thereby suppressed even if using light source of high luminance, and a projected image of high brightness can be obtained by using this light source of high luminance.

Description

【発明の詳細な説明】[Detailed description of the invention]

〔産業上の利用分野〕 本発明は、液晶プロジェクタに使用する反射型液晶表示
パネルの冷却に関する。 〔従来の技術〕 従来知られている反射型液晶表示パネルを具備した液晶
プロジェクタの基本構造の一例を第3図に示す。 1は外装ケースで1内に設けられた光源装置2から出射
された光束は偏光ビームスプリッタ3で偏光され反射型
液晶表示パネル4に入射し、該表示パネルの画像は、反
射光として偏光ビームスプリンタ3.集光レンズ5.投
影レンズ6を通り、7のスクリーン面に拡大投影される
。 要するに、このプロジェクタは反射型液晶表示パネルに
光源からの光束を入射し、表示画像となる反射光を拡大
投影する装置である。 〔発明が解決しようとする課題〕 上記のようなプロジェクタにおいては、光源装置2から
の放射熱や該表示パネルに入射した光束が熱となり、そ
れらの熱によって表示パネル4の温度が上昇する。その
熱が該表示パネルの液晶や駆動素子に影響を及ぼし、正
常な動作をしないという現象があった。 そこで通常は、冷却ファン8によって外装ケ−ス1内に
外気を取り入れ、該表示パ茅ル4やその他外装ケース1
内の強制空冷を行っている。 高輝度の投影画像を得るためムこは、光源の出射光束量
を上げる必要があり、そこで高輝度のキセノンランプ、
メタルハライドランプ等を使用した場合、上記従来の技
術のように華に外気を該表示パネルに送風し空冷するだ
けでは、高い冷却効果は望めず、温度上昇は避けられな
かった。 〔課題を解決するための手段〕 上記の問題点を解決するため本発明では、冷却液を封入
した容器に該冷却液が吸収した熱を該容器の外部に放出
させるため該容器にヒートパイプを挿入した冷却器を反
射型液晶表示パネルの裏面に取り付は該表示パネル及び
、ヒートパイプに外気を送風し強制空冷することにより
、該表示パ矛ルの冷却効果を上げ、高輝度の光源を使用
した高輝度の投影画面を得られる液晶プロジェクタを提
供するところにある。 〔作用〕 上記方法によると、冷却効果が上がり、高輝度の光源を
使用しても該パネルの温度上昇を抑えられる。したがっ
て高輝度の光源を使用し高輝度の投影画像を得ることが
できる。 〔実施例〕 以下、本発明の一実施例を示した第1図、第2図によっ
て説明する。 外装ケース1内に設けられた光源装置2から出射された
光束は、偏光ビームスプリッタ3で偏光され、反射型液
晶表示パネル4に入射、該表示パネルの画像は反射光と
して偏光ビームスプリッタ3、集光レンズ5、投影レン
ズ6を通り、7のスクリーン面に拡大投影される。 該表示パネル4の裏面に取り付けられた冷却容器9は密
封構造の薄箱状の容器で熱伝導率の高いアルミなどの金
属からなり、ここでは図示していないが内部には冷却液
が封入されている。また、10は該容器内に挿入された
ヒートパイプで、該パイプ10は、その両端側が該容器
9の両側面から外部に突き出る状態で該容器の上部に挿
入されでおり、該冷却液が吸収した熱を該容器9の外部
に放熱するもので、該バイブの該容器内に当たる部分は
吸熱部Aとされ、該容器外に突き出た両端側部分は、放
熱部Bとされており、該放熱部には放熱フィン11が設
けられている。該パイプは、両端が閉塞する金属パイプ
で、その内側には図示していないが揮発性の伝熱媒体を
封入しである。該バイブの内面には図示していないが、
該伝熱媒体を毛細管現象により放熱部Bから吸熱部Aに
導くための石綿状のウィックが形成されている。該伝熱
媒体は、暴発、凝縮の可逆二相変化により伝熱を行うも
ので、通常は、潜熱系数が高く浸透性に優れた流体とし
てフロンなどが使用されている。該伝導流体は吸熱部A
において該冷却液との熱交換により蒸気となり、放熱部
Bにおいて外部への熱交換により液化しウィックに浸透
して毛細管現象により再び吸熱部Aに導かれる。 そのため第2図fa)”に示す様に該バイブの放熱部B
は吸熱部Aよりも高くなるように折り曲げた形状となっ
ている。 〔発明の効果〕 以上の説明で明らかなように本発明では、液晶プロジェ
クタに用いる反射型液晶表示パネルの裏面に冷却液を封
入した冷却器を取り付けることにより、該表示パネルの
熱は該冷却液によって吸収されヒートパイプによって外
部に放熱されると共に冷却ファンからの外気によって強
制空冷されるので冷却効果を高く維持することができ、
高輝度の光源を使用しても該表示パネルの温度上昇を抑
えられる。したがって高輝度の光源を使用し高輝度の投
影画像を得るプロジェクタに対して効果がある。
[Industrial Field of Application] The present invention relates to cooling of a reflective liquid crystal display panel used in a liquid crystal projector. [Prior Art] FIG. 3 shows an example of the basic structure of a conventionally known liquid crystal projector equipped with a reflective liquid crystal display panel. Reference numeral 1 denotes an exterior case, and a light beam emitted from a light source device 2 provided inside the case 1 is polarized by a polarizing beam splitter 3 and enters a reflective liquid crystal display panel 4, and an image on the display panel is displayed as reflected light by a polarizing beam splitter. 3. Condensing lens 5. The image passes through a projection lens 6 and is enlarged and projected onto a screen 7 . In short, this projector is a device that allows a light flux from a light source to enter a reflective liquid crystal display panel and enlarges and projects the reflected light that becomes a display image. [Problems to be Solved by the Invention] In the above-described projector, the radiant heat from the light source device 2 and the luminous flux incident on the display panel turn into heat, and the temperature of the display panel 4 rises due to the heat. The heat affected the liquid crystal and drive elements of the display panel, causing them to malfunction. Therefore, normally, outside air is taken into the exterior case 1 by the cooling fan 8, and the display panel 4 and other exterior cases 1 are
Forced air cooling is performed inside the unit. In order to obtain a high-brightness projected image, it is necessary to increase the output luminous flux of the light source, so a high-brightness xenon lamp,
When a metal halide lamp or the like is used, a high cooling effect cannot be expected by simply blowing outside air onto the display panel to cool it as in the conventional technique described above, and an increase in temperature is unavoidable. [Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a heat pipe in a container sealed with a cooling liquid in order to release the heat absorbed by the cooling liquid to the outside of the container. The inserted cooler is installed on the back side of the reflective liquid crystal display panel, and by blowing outside air through the display panel and heat pipes for forced air cooling, the cooling effect of the display panel is increased and the high-brightness light source is The purpose of the present invention is to provide a liquid crystal projector that can provide a high-brightness projection screen. [Function] According to the above method, the cooling effect is improved, and even if a high-intensity light source is used, the temperature rise of the panel can be suppressed. Therefore, a high-brightness projection image can be obtained using a high-brightness light source. [Embodiment] An embodiment of the present invention will be explained below with reference to FIG. 1 and FIG. 2. The light beam emitted from the light source device 2 provided inside the exterior case 1 is polarized by the polarizing beam splitter 3, and then enters the reflective liquid crystal display panel 4. The image on the display panel is transmitted as reflected light to the polarizing beam splitter 3 and condensed by the polarizing beam splitter 3. The image passes through a light lens 5 and a projection lens 6, and is enlarged and projected onto a screen 7. The cooling container 9 attached to the back surface of the display panel 4 is a thin box-shaped container with a sealed structure and is made of a metal such as aluminum with high thermal conductivity, and although not shown here, a cooling liquid is sealed inside. ing. Further, 10 is a heat pipe inserted into the container, and the pipe 10 is inserted into the upper part of the container with both ends protruding outside from both sides of the container 9, and the cooling liquid is absorbed. The part of the vibrator that touches the inside of the container is a heat absorbing part A, and the parts on both ends protruding outside the container are heat radiating parts B. A heat radiation fin 11 is provided in the portion. The pipe is a metal pipe with both ends closed, and a volatile heat transfer medium (not shown) is sealed inside the pipe. Although not shown on the inner surface of the vibrator,
An asbestos-like wick is formed to guide the heat transfer medium from the heat radiation part B to the heat absorption part A by capillary action. The heat transfer medium performs heat transfer through a reversible two-phase change of explosion and condensation, and fluorocarbon or the like is usually used as a fluid with a high latent heat coefficient and excellent permeability. The conductive fluid is in the heat absorption part A
It becomes a vapor by heat exchange with the cooling liquid, liquefies by heat exchange to the outside in the heat radiation part B, penetrates the wick, and is led to the heat absorption part A again by capillary action. Therefore, as shown in Figure 2 fa), the heat dissipation part B of the vibrator is
It has a bent shape so that it is higher than the heat absorption part A. [Effects of the Invention] As is clear from the above description, in the present invention, by attaching a cooler filled with a cooling liquid to the back side of a reflective liquid crystal display panel used in a liquid crystal projector, the heat of the display panel is absorbed by the cooling liquid. The heat is absorbed by the air and radiated to the outside by the heat pipe, and is forcedly cooled by the outside air from the cooling fan, making it possible to maintain a high cooling effect.
Even if a high-intensity light source is used, the temperature rise of the display panel can be suppressed. Therefore, it is effective for a projector that uses a high-intensity light source and obtains a high-intensity projected image.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明にかかる一実施例を示す正面図、第2図
<al〜(elはそれぞれ冷却器と反射型液晶表示パネ
ルの正面図、上面図および側面図、第3図は従来例を示
す正面図である。 1・・・外装ケース 2・・・光源装置 3・・・偏光ビームスプリッタ 4・・・反射型液晶パネル 5・・・集光レンズ 6・・・投影レンズ 7・・・スクリーン面 8・・・冷却ファン 9・・・冷却容器 10・・・ヒートパイプ 11・・・放熱フィン 以上 出願人 セイコー電子工業株式会社 代理人 弁理士 林  敬 之 助 / −ノ / 冷却器とへせ望)悦晶表示バキルの三面図第2図 手続補正書動却 平成 3年 3月14日 1、事件の表示 平成 2年 特許願 第298203号2、発明の名称 反射型液晶表示パネル 3、M正をする者 事件との関係 出願人 代表取締役  原  禮之助 5、補正命令の日付 平成 3年 2月12日 6、+s正の対象
FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a front view, top view, and side view of a cooler and a reflective liquid crystal display panel, and FIG. 3 is a conventional example. 1... Exterior case 2... Light source device 3... Polarizing beam splitter 4... Reflective liquid crystal panel 5... Condensing lens 6... Projection lens 7...・Screen surface 8...Cooling fan 9...Cooling container 10...Heat pipe 11...Radiating fins and above Applicant Seiko Electronic Industries Co., Ltd. Agent Patent attorney Keinosuke Hayashi / -ノ/ Cooler and Hese Nozomi) Etsu crystal display Three views of Bakir Figure 2 Procedural amendment filing March 14, 1991 1. Case description 1990 Patent Application No. 298203 2. Title of invention Reflective liquid crystal display panel 3 , Relationship with the case of the person making the M correction Applicant Representative Director Reinosuke Hara 5, Date of amendment order February 12, 1991 6, Subject of +s correction

【図面の簡単な説明】[Brief explanation of the drawing]

7、補正の内容 7. Contents of correction

Claims (1)

【特許請求の範囲】[Claims]  反射型液晶表示パネルを備えた表示系装置と、該表示
パネルを照明するために設けられた光源系装置と、該表
示パネルを投影する光学系装置とからなる反射型液晶表
示パネルを用いた液晶プロジェクタにおいて、冷却液を
封入した容器に、該冷却液が吸収した熱を該容器の外部
放熱させるためヒートパイプを該容器に挿入した冷却器
を該パネルの裏面に具備することを特徴とした液晶プロ
ジェクタ用反射型液晶表示パネル。
A liquid crystal display using a reflective liquid crystal display panel consisting of a display system device equipped with a reflective liquid crystal display panel, a light source system device provided for illuminating the display panel, and an optical system device for projecting the display panel. A liquid crystal display projector, characterized in that a container filled with a cooling liquid is provided with a cooler on the back side of the panel, in which a heat pipe is inserted into the container to radiate heat absorbed by the cooling liquid to the outside of the container. Reflective liquid crystal display panel for projectors.
JP2298203A 1990-11-02 1990-11-02 Reflector type liquid crystal display panel Pending JPH04171480A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2298203A JPH04171480A (en) 1990-11-02 1990-11-02 Reflector type liquid crystal display panel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2298203A JPH04171480A (en) 1990-11-02 1990-11-02 Reflector type liquid crystal display panel

Publications (1)

Publication Number Publication Date
JPH04171480A true JPH04171480A (en) 1992-06-18

Family

ID=17856550

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2298203A Pending JPH04171480A (en) 1990-11-02 1990-11-02 Reflector type liquid crystal display panel

Country Status (1)

Country Link
JP (1) JPH04171480A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0757278A3 (en) * 1995-06-07 1997-02-12 Vari-Lite, Inc. High intensity illuminating projector with reflective liquid crystal modulator
US5691886A (en) * 1991-04-30 1997-11-25 Vari-Lite, Inc. Programmable rotatable gobo system
US6769792B1 (en) 1991-04-30 2004-08-03 Genlyte Thomas Group Llc High intensity lighting projectors

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5691886A (en) * 1991-04-30 1997-11-25 Vari-Lite, Inc. Programmable rotatable gobo system
US5758956A (en) * 1991-04-30 1998-06-02 Vari-Lite, Inc. High intensity lighting projectors
US5829868A (en) * 1991-04-30 1998-11-03 Vari-Lite, Inc. High intensity lighting projectors
US6011640A (en) * 1991-04-30 2000-01-04 Vari-Lite, Inc. High intensity lighting projectors
US6769792B1 (en) 1991-04-30 2004-08-03 Genlyte Thomas Group Llc High intensity lighting projectors
EP0757278A3 (en) * 1995-06-07 1997-02-12 Vari-Lite, Inc. High intensity illuminating projector with reflective liquid crystal modulator

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