JPH03164787A - Liquid crystal projector - Google Patents
Liquid crystal projectorInfo
- Publication number
- JPH03164787A JPH03164787A JP30331189A JP30331189A JPH03164787A JP H03164787 A JPH03164787 A JP H03164787A JP 30331189 A JP30331189 A JP 30331189A JP 30331189 A JP30331189 A JP 30331189A JP H03164787 A JPH03164787 A JP H03164787A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- cooling air
- crystal panel
- light
- 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.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 71
- 238000001816 cooling Methods 0.000 claims abstract description 120
- 230000000694 effects Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000012780 transparent material Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Liquid Crystal (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、液晶パネルに光源のランプからの光を投射・
透過し投影レンズにより液晶パネルの画像をスクリーン
に拡大投影をおこなう、液晶プロジェクタ−に関し、特
に液晶パネルの冷却装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for projecting light from a lamp as a light source onto a liquid crystal panel.
The present invention relates to a liquid crystal projector that enlarges and projects an image on a liquid crystal panel onto a screen using a projection lens, and particularly relates to a cooling device for a liquid crystal panel.
［従来の技術］
第１３図は、従来知られている液晶プロジェクタ−を示
している。同図において、光源１から出た光は後方の反
射鏡２にて反射され、集光レンズ３により平行光にされ
る。平行光にされた光は、防熱フィルタ４を通過するこ
とにより、その熱成分、特に赤外光を吸収・除去される
。防熱フィルタ４を通過した光は、集光レンズ５にて集
光されて液晶パネル６に入射する。液晶パネル６は、い
わゆる光シヤツターであり、画面を構成している絵素が
信号に応じて開閉し、集光レンズ５から入射した光を通
すことによって映像が作りだされる。液晶パネル６によ
って形成された映像は、凹・凸レンズの組み合わせより
成る投影レンズ７によって拡大・投射され、スクリーン
８の画面上に結像される。但し、スクリーン８に替えて
室内壁面等に投射−結像させる場合もある。液晶パネル
６は、モノクローム又はカラーが用いられる。[Prior Art] FIG. 13 shows a conventionally known liquid crystal projector. In the figure, light emitted from a light source 1 is reflected by a rear reflecting mirror 2 and converted into parallel light by a condenser lens 3. The collimated light passes through the heat protection filter 4, and its heat components, particularly infrared light, are absorbed and removed. The light passing through the heat shielding filter 4 is condensed by a condenser lens 5 and enters a liquid crystal panel 6. The liquid crystal panel 6 is a so-called optical shutter, and the picture elements forming the screen open and close in response to signals, and an image is created by passing the light incident from the condensing lens 5. The image formed by the liquid crystal panel 6 is magnified and projected by a projection lens 7 consisting of a combination of concave and convex lenses, and is imaged on a screen 8. However, instead of the screen 8, the image may be projected and imaged onto an indoor wall surface or the like. The liquid crystal panel 6 may be monochrome or color.
このような液晶プロジェクタ−においては光源１からの
光の吸収により液晶パネル６が発熱し、過熱により液晶
パネル６が損傷を受けるという事態が生じる。そのため
、従来は防熱フィルタ４によって光源１からの光の熱成
分を吸収・除去すると共に、液晶パネル６の側方に冷却
ファンを配設し、この冷却ファン９によって液晶パネル
６を強制冷却するようにしていた。In such a liquid crystal projector, the liquid crystal panel 6 generates heat due to absorption of light from the light source 1, and the liquid crystal panel 6 is damaged due to overheating. Therefore, conventionally, the heat component of the light from the light source 1 is absorbed and removed by the heat shielding filter 4, and a cooling fan is provided on the side of the liquid crystal panel 6, and the liquid crystal panel 6 is forcibly cooled by the cooling fan 9. I was doing it.
［発明が解決しようとする課顕］
上記従来の構成では、防熱フィルタ４による熱成分の吸
収・除去と、冷却ファン９による強制空冷とによる冷却
方式では、冷却効率及び冷却性能が悪く、液晶パネル６
の冷却が不十分であり、そのため、スクリーン８上の投
影画面の明るさを明るくするために光源１の光を強くす
ると、液晶パネル６が光の吸収により損傷を受けるとい
う問題が生じる。従って、光源１の光をそれほど強くは
できず、結果的に投影画面の明るさをあまり明るくでき
ないという欠点が生じていた。[Problems to be Solved by the Invention] In the above-mentioned conventional configuration, the cooling efficiency and performance of the cooling method using absorption and removal of heat components by the heat shield filter 4 and forced air cooling by the cooling fan 9 is poor, and the liquid crystal panel 6
Therefore, when the light from the light source 1 is strengthened in order to brighten the projection screen on the screen 8, a problem arises in that the liquid crystal panel 6 is damaged due to absorption of light. Therefore, the light from the light source 1 cannot be made very strong, resulting in the drawback that the brightness of the projection screen cannot be made very bright.
この発明は以上の点に鑑み提案されたもので、冷却性能
が良く、かつ、冷却効率が高く、液晶パネル６の冷却に
適用したとき、パネル画に入射させる光の強度を液晶パ
ネル６を損傷させることなくより強くすることを可能と
し、さらに明るい投影画面を得ることを目的とするもの
である。This invention has been proposed in view of the above points, and has good cooling performance and high cooling efficiency, and when applied to cooling the liquid crystal panel 6, the intensity of light incident on the panel image can be reduced to damage the liquid crystal panel 6. The purpose of this is to make it possible to make the projection screen stronger without causing any damage, and to obtain an even brighter projection screen.
［課顕を解決するための手段］
本発明は前述の目的を達成するために、光源からの光を
液晶パネルに通して映像を形成し、この映像を投影レン
ズに通して拡大・投射する液晶プロジェクタ−において
、
前記液晶パネルの前記光が入光する入光面側に一方の面
に前記入光面を有し、他方の面に透光部材を有する冷却
風通路を形成した冷却風通路本体を具備し、この冷却風
通路本体の前記冷却風通路に前記液晶パネルを冷却する
ための冷却風を供給する冷却ファンを取り付けて構成し
たものである。[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a liquid crystal display that passes light from a light source through a liquid crystal panel to form an image, and enlarges and projects this image through a projection lens. In the projector, a cooling air passage main body having a cooling air passage formed with the light input surface on one surface and a light-transmitting member on the other surface on the light input surface side of the liquid crystal panel through which the light enters. A cooling fan for supplying cooling air for cooling the liquid crystal panel is attached to the cooling air passage of the cooling air passage main body.
また、第２の発明として透光部材を集光レンズで形成し
てものである６
さらに、第３の発明として透光性部材を防熱フィルタで
形成したものである。Further, as a second invention, the light-transmitting member is formed by a condensing lens.6 Furthermore, as a third invention, the light-transmitting member is formed by a heat-insulating filter.
［作用］
この発明によれば、液晶パネルの入光面側に設けた冷却
風の通路により冷却風をすべて液晶パネルの入光面の近
傍に通すことができ、また冷却風の流速も冷却風が通る
通路の形状を変えることによって可変することが出来る
ため液晶パネルの冷却効果を高めることが出来る。[Function] According to the present invention, all of the cooling air can be passed near the light entrance surface of the liquid crystal panel by the cooling air passage provided on the light entrance surface side of the liquid crystal panel, and the flow rate of the cooling air can also be adjusted to match the cooling air. This can be varied by changing the shape of the path through which the liquid crystal panel cools, thereby increasing the cooling effect of the liquid crystal panel.
［実施例］
本発明の液晶プロジェクタ−への適用例について以下説
明する。第１図〜第５図は本発明の第１の実施例を示す
。[Example] An example of application of the present invention to a liquid crystal projector will be described below. 1 to 5 show a first embodiment of the present invention.
第１図及び第２図において、６は液晶パネル、１０は冷
却風通路本体、１１はガラス・アクリルなどの透明材、
１２は冷却ファンである。液晶パネル６はモノクローム
、単色、カラーが用いられる。1 and 2, 6 is a liquid crystal panel, 10 is a cooling air passage main body, 11 is a transparent material such as glass or acrylic,
12 is a cooling fan. The liquid crystal panel 6 may be monochrome, single color, or color.
本図において、液晶パネル６と冷却通路本体１０と透光
部材１１により冷却風Ａの通路１３を形成し、その通路
１３に冷却ファン１２からの冷却風Ａを通すことにより
液晶パネル６に冷却風Ａを当てて液晶パネル６の冷却を
行う、透光部材１１は、ガラス板あるいはアクリル板な
どの透明な材質のもので形成される。この冷却装置を用
いることにより冷却ファン１２が発生する冷却風Ａをす
べて液晶パネル６の入光面１４の近傍に通すことができ
、また冷却風の通路１３が冷却ファン１２の冷却風出口
１５よりも狭くすることにより冷却風Ａの流速も早くで
きるため液晶パネル６の冷却効果を高めることが出来る
。したがって、冷却風の通路１３の冷却風出口１５の形
状を大又小と変形させることで、冷却風Ａの流速を可変
することができるものである。In this figure, a passage 13 for cooling air A is formed by the liquid crystal panel 6, the cooling passage main body 10, and the transparent member 11, and the cooling air A from the cooling fan 12 is passed through the passage 13, so that the cooling air flows through the liquid crystal panel 6. The light-transmitting member 11, which cools the liquid crystal panel 6 by applying the light A, is made of a transparent material such as a glass plate or an acrylic plate. By using this cooling device, all of the cooling air A generated by the cooling fan 12 can be passed near the light incident surface 14 of the liquid crystal panel 6, and the cooling air passage 13 is connected to the cooling air outlet 15 of the cooling fan 12. By making the width narrower, the flow velocity of the cooling air A can be increased, so that the cooling effect of the liquid crystal panel 6 can be enhanced. Therefore, by changing the shape of the cooling air outlet 15 of the cooling air passage 13 to be large or small, the flow velocity of the cooling air A can be varied.
ここで、冷却風通路本体１０の構造について、第３図〜
第５図を用いてさらに詳しく説明すると、冷却風通路本
体１０は、一端に第１及び２図に示した冷却ファン１２
から送風される冷却風Ａを取り込むための風入口１６を
有し、この風入口１６は冷却ファン１２から送風される
冷却風Ａを総て取り込むためにその断面が冷却ファン１
２の冷却風呂口１５（第２図）と同じ大きさに形成され
ている。そして他端に、冷却風Ａを外部に排出するため
に風出口１７を有し、この風出口１７は風入口１６の断
面より小さく形成されている。このように形成された冷
却風通路本体１０の一面１０ａ側に液晶パネル６を密接
・接合し、他面１０ｂ側に透光部材１１を密接−接合す
る。さらに、光源１からの光が透光部材１１を通過し、
液晶パネル６の入光面１４に到達するように、光源１か
らの光の投過方向Ｂを中心に冷却風通路本体１０の幅Ｃ
及び高さＤの大きさより小さい面積（幅Ｃ′及び高さＤ
’ ）で切欠部１９．２０が施こされており、切欠部１
９には液晶パネル６の入光面１４が挿入され、切欠部２
０には透光部材１１が覆うように取り付けられている。Here, regarding the structure of the cooling air passage main body 10, FIGS.
To explain in more detail using FIG. 5, the cooling air passage main body 10 has a cooling fan 12 shown in FIGS. 1 and 2 at one end.
It has an air inlet 16 for taking in the cooling air A blown from the cooling fan 12, and the cross section of the air inlet 16 is the same as that of the cooling fan 1 in order to take in all the cooling air A blown from the cooling fan 12.
It is formed to have the same size as the cooling bath opening 15 (FIG. 2). The other end has an air outlet 17 for discharging the cooling air A to the outside, and the air outlet 17 is formed smaller in cross section than the air inlet 16. The liquid crystal panel 6 is closely bonded to one surface 10a of the cooling air passage main body 10 formed in this way, and the light-transmitting member 11 is closely bonded to the other surface 10b. Furthermore, the light from the light source 1 passes through the transparent member 11,
The width C of the cooling air passage main body 10 is centered on the projection direction B of the light from the light source 1 so that the light reaches the light incident surface 14 of the liquid crystal panel 6.
and the area smaller than the height D (width C' and height D
' ) are provided with cutouts 19 and 20, and cutout 1
The light entrance surface 14 of the liquid crystal panel 6 is inserted into the notch 9 .
0 is attached with a transparent member 11 so as to cover it.
そして、この液晶パネル６を冷却する冷却装置は、第１
２図に示すように取り付け・支持される、すなわち、液
晶プロジェクタ−本体１００の内部に切起された切起片
１０１に液晶パネル６が、例えば接着剤あるいはネジな
どの固定手段により、密接・接合１０２される。さらに
、冷却ファン１２は、切起片１０１同様、液晶プロジェ
クタ−本体１００からＬ字状に切起された切起片１０３
に、ネジ１０４等によって固定・支持される。この時冷
却ファンのケース１０２は底面１０７に当接１０６して
いる。The cooling device for cooling this liquid crystal panel 6 is a first cooling device.
The liquid crystal panel 6 is mounted and supported as shown in FIG. 102. Further, the cooling fan 12 is provided with a cut-and-raised piece 103 that is cut and raised in an L-shape from the liquid crystal projector main body 100, similar to the cut-and-raised piece 101.
It is fixed and supported by screws 104 and the like. At this time, the case 102 of the cooling fan is in contact 106 with the bottom surface 107.
なお、光源１から投影レンズ７までの全体構成としては
、第１３図の従来構成図を参考にして説明すると、液晶
パネル６と集光レンズ５の間に、冷却風通路本体１０と
透光部材１１が介在するように構成されている。The overall configuration from the light source 1 to the projection lens 7 will be explained with reference to the conventional configuration diagram in FIG. 11 is interposed therebetween.
次に、第６図から第１０図を用いて、第２の実施例を説
明する。６は液晶パネル、１０は冷却風通路本体、１８
は集光レンズ、１２は冷却ファンである。Next, a second embodiment will be described using FIGS. 6 to 10. 6 is a liquid crystal panel, 10 is a cooling air passage main body, 18
1 is a condensing lens, and 12 is a cooling fan.
本図において、液晶パネル６と冷却通路本体１０と集光
レンズ１８により冷却風Ａの通路１３を形成しその通路
１３に冷却ファン１２からの冷却風Ａを通すことにより
液晶パネル６に冷却風Ａを当てて液晶パネル６の冷却を
行う、この冷却装置を用いることいより冷却ファン１２
が発生する冷却風Ａをすべて液晶パネル６の入光面１４
の近傍に通すことができ、また冷却風の通路１３が冷却
ファン１２の冷却風出口１５よりも狭くできることによ
り冷却風Ａの流速も早くなるため液晶パネル６の冷却効
果を高めることができる。In this figure, a cooling air passage 13 is formed by the liquid crystal panel 6, the cooling passage main body 10, and the condensing lens 18, and the cooling air A from the cooling fan 12 is passed through the passage 13 to cause the cooling air A to flow through the liquid crystal panel 6. By using this cooling device, the cooling fan 12 cools the liquid crystal panel 6 by
All of the cooling air A generated by
Since the cooling air passage 13 can be made narrower than the cooling air outlet 15 of the cooling fan 12, the flow velocity of the cooling air A can be increased, so that the cooling effect of the liquid crystal panel 6 can be enhanced.
したがって、冷却風の通路１３の冷却風出口１５の形状
を大又小と変形させることで、冷却風Ａの流速を可変す
ることができるものである。Therefore, by changing the shape of the cooling air outlet 15 of the cooling air passage 13 to be large or small, the flow velocity of the cooling air A can be varied.
ここで、冷却風通路本体１０の構造について、第８図〜
第１０図を用いてさらに詳しく説明すると一冷却風通路
本体１０は、−ａに冷却ファン１２から送風される冷却
風Ａを取り込むための風入口１６を有し、この風入口１
６は冷却ファン１２から送風される冷却風Ａを総て取り
込むためにその断面が冷却ファン１２の冷却風出口１５
と同じ大きさに形成されている。そして他端に、冷却風
Ａを外部に排出するための風出口１７を有し、この風出
口１７は風入口１６の断面より小さく形成されている。Here, regarding the structure of the cooling air passage main body 10, FIGS.
To explain in more detail using FIG. 10, the cooling air passage main body 10 has an air inlet 16 at -a for taking in the cooling air A blown from the cooling fan 12, and this air inlet 1
Reference numeral 6 designates the cooling air outlet 15 of the cooling fan 12 in order to take in all the cooling air A blown from the cooling fan 12.
is formed to the same size. The other end has an air outlet 17 for discharging the cooling air A to the outside, and this air outlet 17 is formed smaller in cross section than the air inlet 16.
このように形成された。冷却風通路本体１０の一面１０
ａ側に液晶パネル６を密接・接合し、他面１０ｂ側に集
光レンズ１８を密接・接合する。This is how it was formed. One side 10 of the cooling air passage main body 10
The liquid crystal panel 6 is closely bonded to the a side, and the condenser lens 18 is closely bonded to the other surface 10b side.
さらに、光源１からの光が透光部材１１．１８を通過し
、液晶パネル６の入光面１４に到達するように、光源１
からの光の投過方向Ｂを中心に冷却風通路本体１０の幅
Ｃ及び高さＤの大きさより小さい面積（幅Ｃ′及び高さ
Ｄ’ ）で切欠部１９．２０を施し、切欠部１９には液
晶パネル６の入光面１４が挿入され、切欠部２０には集
光レンズ１８がその切欠部を覆うように取り付けられる
。Further, the light source 1 is arranged such that the light from the light source 1 passes through the light transmitting member 11.18 and reaches the light incident surface 14 of the liquid crystal panel 6.
Notches 19 and 20 are formed with an area (width C' and height D') smaller than the width C and height D of the cooling air passage main body 10 centering on the projection direction B of light from the cooling air passage main body 10. The light entrance surface 14 of the liquid crystal panel 6 is inserted into the notch 20, and the condenser lens 18 is attached to the notch 20 so as to cover the notch.
そして、この冷却装置は、第１の実施例において、第１
２図を用いて説明した取り付けと同様の取り付けにより
、液晶プロジェクタ−本体１００に固定、支持される。In the first embodiment, this cooling device has a first
It is fixed and supported by the liquid crystal projector main body 100 by the same installation as that explained using FIG.
なお、光源１から投影レンズ７までのｔ体郁成としては
、第１３図の従来構成図を参考にしで説明すると、液晶
パネル６と集光レンズ５が冷却風通路本体１０を介して
一体形成された構成とされている。In addition, as for the T-body structure from the light source 1 to the projection lens 7, referring to the conventional configuration diagram in FIG. It is said that the configuration is as follows.
さらに、第３の実施例として第１図に示す透光部材１１
あるいは第６図に示す集光レンズ１８の代わりに、防熱
フィルタ４で形成しても、本発明の効果はなんら変わる
ことは力い、ただし、この際防熱フィルタ４と光源１と
の間には集光レンズ３と集光レンズ５が介在している。Furthermore, as a third embodiment, the light-transmitting member 11 shown in FIG.
Alternatively, the effect of the present invention will not change in any way even if a heat-proof filter 4 is used instead of the condensing lens 18 shown in FIG. A condenser lens 3 and a condenser lens 5 are interposed.
以上説明した、冷却装置の冷却ファン１２は、すべて冷
却風通路１３の長手方向下方に設けているが、これに限
るものでなく、例えば第１．１図に示すように、冷却風
通路１３に対して垂直方向に設けても良い。The cooling fans 12 of the cooling device described above are all provided below the cooling air passage 13 in the longitudinal direction, but the invention is not limited to this. For example, as shown in FIG. It may also be provided in a vertical direction.
［発明の効果］
このように、本発明は液晶パネル、冷却風通路本体、透
光部材（あるいは集光レンズ）により、冷却ファンから
送風される冷却風の通る通路を形成するので１強い光を
液晶パネルに投射しても液晶パネルの冷却を充分おこな
えるため、その結果明るい投影画を持つ液晶プロジェク
タ−を実用化することが可能になる。[Effects of the Invention] As described above, the present invention uses the liquid crystal panel, the cooling air passage main body, and the light-transmitting member (or the condensing lens) to form a passage through which the cooling air blown from the cooling fan passes, so that strong light cannot be emitted. Even when projecting onto a liquid crystal panel, the liquid crystal panel can be sufficiently cooled, and as a result, it becomes possible to put into practical use a liquid crystal projector with a bright projected image.
第１図から第５図は本発明の第１の実施例を示す図であ
って、第１図は斜示図、第２図は断面図、第３図は冷却
風通路本体の断面図、第４図は正面図、第５図は上面図
である。
また、第６図から第１０図は本発明の第２の実施例を示
す図であって、第６図は斜示図、第７図は断面図、第８
図は冷却風通路本体の断面図、第９図は正面図、第１０
図は上面図である。
さらに、第１１図は第３の実施例を示す図であり、第１
２図は取付状態を示す図である。
第１３図は従来の構成を示す従来構成図である１・・・
光源、４・・・防熱フィルタ、５・・・集光レンズ、６
・・・液晶パネル、１０・・・冷却風通路本体、１１・
・・透光部材（ガラス板あるいはアクリル板などの透明
な材質のもの）、１２・・・冷却ファン、１３・・・冷
却風通路１００・・・液晶プロジェクタ−本体。1 to 5 are views showing a first embodiment of the present invention, in which FIG. 1 is a perspective view, FIG. 2 is a sectional view, and FIG. 3 is a sectional view of the cooling air passage main body. FIG. 4 is a front view, and FIG. 5 is a top view. 6 to 10 are diagrams showing a second embodiment of the present invention, in which FIG. 6 is a perspective view, FIG. 7 is a sectional view, and FIG.
The figure is a sectional view of the cooling air passage main body, Figure 9 is a front view, and Figure 10 is a cross-sectional view of the main body of the cooling air passage.
The figure is a top view. Furthermore, FIG. 11 is a diagram showing a third embodiment, and the first
Figure 2 is a diagram showing the installed state. FIG. 13 is a conventional configuration diagram showing a conventional configuration.1...
Light source, 4... Heat protection filter, 5... Condensing lens, 6
...Liquid crystal panel, 10...Cooling air passage main body, 11.
. . . Translucent member (made of transparent material such as a glass plate or acrylic plate), 12 . . . Cooling fan, 13 . . . Cooling air passage 100 .
Claims (4)
、この映像を投影レンズに通して拡大・投射する液晶プ
ロジェクターにおいて、 前記液晶パネルの前記光が入光する入光面側に、一方の
面に前記入光面を有し、他方の面に透光部材を有する冷
却風通路を形成した冷却風通路本体を具備し、この冷却
風通路本体の前記冷却風通路に前記液晶パネルを冷却す
るための冷却風を供給する冷却ファンを取り付けたこと
を特徴とする液晶プロジェクター。(1) In a liquid crystal projector that passes light from a light source through a liquid crystal panel to form an image, and enlarges and projects this image through a projection lens, on the light entrance surface side of the liquid crystal panel where the light enters, The cooling air passage main body has a cooling air passage formed with the light input surface on one surface and a light transmitting member on the other surface, and the liquid crystal panel is disposed in the cooling air passage of the cooling air passage main body. A liquid crystal projector characterized by being equipped with a cooling fan that supplies cooling air for cooling.
熱フィルタを有することを特徴とする請求項１記載の液
晶プロジェクター。(2) The liquid crystal projector according to claim 1, further comprising a condenser lens and a heat shielding filter between the light source and the liquid crystal panel.
特徴とする請求項１記載の液晶プロジェクター。(3) The liquid crystal projector according to claim 1, wherein the light-transmitting member is formed of the condenser lens.
を特徴とする請求項１記載の液晶プロジェクター。(4) The liquid crystal projector according to claim 1, wherein the light-transmitting member is formed of the heat-insulating filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30331189A JP2920967B2 (en) | 1989-11-24 | 1989-11-24 | LCD projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30331189A JP2920967B2 (en) | 1989-11-24 | 1989-11-24 | LCD projector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03164787A true JPH03164787A (en) | 1991-07-16 |
| JP2920967B2 JP2920967B2 (en) | 1999-07-19 |
Family
ID=17919437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30331189A Expired - Lifetime JP2920967B2 (en) | 1989-11-24 | 1989-11-24 | LCD projector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2920967B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08274481A (en) * | 1995-03-31 | 1996-10-18 | Nippon Densan Corp | Electronic parts cooling device |
| US5682216A (en) * | 1996-04-01 | 1997-10-28 | Ctx Opto-Electronics Corp. | LCD projector capable of preventing thermal shimmering by using a thermal diffusion film |
| EP1677139A1 (en) * | 2004-12-29 | 2006-07-05 | LG Electronics, Inc. | Display device provided with a cooling fan |
-
1989
- 1989-11-24 JP JP30331189A patent/JP2920967B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08274481A (en) * | 1995-03-31 | 1996-10-18 | Nippon Densan Corp | Electronic parts cooling device |
| US5682216A (en) * | 1996-04-01 | 1997-10-28 | Ctx Opto-Electronics Corp. | LCD projector capable of preventing thermal shimmering by using a thermal diffusion film |
| EP1677139A1 (en) * | 2004-12-29 | 2006-07-05 | LG Electronics, Inc. | Display device provided with a cooling fan |
| US7522416B2 (en) | 2004-12-29 | 2009-04-21 | Lg Electronics Inc. | Display device and blower thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2920967B2 (en) | 1999-07-19 |
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