JPH0756539B2 - Projection display device - Google Patents
Projection display deviceInfo
- Publication number
- JPH0756539B2 JPH0756539B2 JP61011387A JP1138786A JPH0756539B2 JP H0756539 B2 JPH0756539 B2 JP H0756539B2 JP 61011387 A JP61011387 A JP 61011387A JP 1138786 A JP1138786 A JP 1138786A JP H0756539 B2 JPH0756539 B2 JP H0756539B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- projection
- light receiving
- display device
- screen
- 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.)
- Expired - Lifetime
Links
- 230000007423 decrease Effects 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- AQCDIIAORKRFCD-UHFFFAOYSA-N cadmium selenide Chemical compound [Cd]=[Se] AQCDIIAORKRFCD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 208000032368 Device malfunction Diseases 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Projection Apparatus (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Liquid Crystal (AREA)
Description
【発明の詳細な説明】 ＜産業上の技術分野＞ 本発明は投写型表示装置における、投写光量の自動制御
装置に関するものである。Description: TECHNICAL FIELD The present invention relates to an automatic control device of a projection light amount in a projection display device.
＜発明の概要＞ 本発明は、投写型表示装置において、投写用レンズの焦
点距離すなわち画像焦点の変化に合わせて同時に受光焦
点距離を変化させる連動装置を備えた受光装置を用い、
画像投写用スクリーン上の投写画像部の外側側近の光量
を測定し、その結果をもとに光量制御電源装置により投
写光源の発光量をコントロールし、投写用スクリーン及
び周辺の明るさに合った投写画像光量を自動発生し、高
画質の投写画像を安定に得られるようにしたものであ
る。<Summary of the Invention> The present invention uses, in a projection display device, a light receiving device including an interlocking device that simultaneously changes the light receiving focal length in accordance with the change in the focal length of the projection lens, that is, the image focus.
Measure the amount of light near the outside of the projected image area on the image projection screen, and based on the result, control the amount of light emitted from the projection light source by the light amount control power supply device, and project according to the brightness of the projection screen and surroundings. The amount of image light is automatically generated so that a high quality projected image can be stably obtained.
＜従来の技術＞ 従来、フロント側から投写する投写型表示装置において
この種の技術は装置機能としてはまったくなく、外光の
コントロールすなわちカーテンや室内燈の調光により適
正投写画像の調整が行なわれて来た。<Prior Art> Conventionally, in a projection type display device that projects from the front side, this kind of technique has no device function, and an appropriate projection image is adjusted by controlling external light, that is, dimming a curtain or an interior lamp. Came.
＜発明が解決しようとする問題点＞ しかし、前述の従来技術では、画像投写に際し、前準備
としてカーテンや室内燈により室内調光作業が必要であ
ると同時に調光の微調整は不可能であり投写画像光量と
の適正化に於いて不具合でありその結果、コントラスト
の低下による画質低下やコントラストの過多による目の
疲労などが強いられる結果となった。<Problems to be Solved by the Invention> However, in the above-mentioned conventional technique, it is necessary to perform room light control work by a curtain or room light as a preparation for image projection, and at the same time, fine adjustment of light control is impossible. This is a problem in optimizing the light quantity of the projected image, and as a result, the image quality is deteriorated due to the deterioration of the contrast and the eyes are fatigued due to the excessive contrast.
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、画像投写に際し、カーテンや室
内燈による周囲光量の調光作業をなくすと同時に、常に
適正な明るさの投写画像が得られる様自動的に内部コン
トロールを可能とした自動調光機能付投写型表示装置を
提供するところにある。Therefore, the present invention solves such a problem, and an object of the present invention is to eliminate the work of adjusting the ambient light amount by a curtain or an interior lamp at the time of image projection, and at the same time, always project an image with appropriate brightness. To provide a projection display device with an automatic light control function that enables automatic internal control so that
＜問題点を解決するための手段＞ 本発明の投写型表示装置は、 投写光源からの光をライトバルブと投写レンズとを介し
て表面側からスクリーンに画像データを投写する投写型
表示装置において、 前記スクリーンに投写された前記画像データ近傍の側近
光量を受光レンズを介して受光素子により測定し電気信
号に変換する受光手段と、 前記受光手段の出力に応じて前記投写光源の光量を調整
する光量制御手段と、 前記スクリーンと前記表示装置との距離に応じ前記投写
レンズ及び前記受光レンズの焦点距離を連動的に変化さ
せる連動手段と、 を備えたことを特徴とする。<Means for Solving Problems> A projection display device of the present invention is a projection display device that projects image data from a front surface side of a light from a projection light source through a light valve and a projection lens onto a screen. Light receiving means for measuring the amount of near-side light near the image data projected on the screen by a light receiving element via a light receiving lens and converting it into an electric signal, and light quantity for adjusting the light amount of the projection light source according to the output of the light receiving means. Control means, and interlocking means for interlockingly changing the focal lengths of the projection lens and the light receiving lens according to the distance between the screen and the display device.
＜作 用＞ 本発明の上記の構成によれば、受光装置は連動装置によ
り投写用レンズ焦点に常に連動して投写スクリーン上の
画像部外側側近の明るさを常時測定しフィードバック信
号として電気量に変換し光量制御電源装置に伝える。こ
れにより周囲光量の変化が画質に最も影響をあたえるス
クリーン周辺の明暗変化量が光量制御電源装置にフィー
ドバックされ、周囲光が明るければより投写光量を増
し、周囲光が暗ければ適正な明るさまで投写光源の光量
を減らし、投写画像の輝度適正化を自動的に行なうもの
である。<Operation> According to the above configuration of the present invention, the light receiving device is always linked to the focus of the projection lens by the interlocking device to constantly measure the brightness near the outer side of the image portion on the projection screen and use it as an electric signal as a feedback signal. It is converted and transmitted to the light quantity control power supply device. With this, the brightness change amount around the screen, where the change in the ambient light amount has the greatest effect on the image quality, is fed back to the light amount control power supply unit. The amount of light from the light source is reduced and the brightness of the projected image is automatically optimized.
＜実施例＞ 以下、図面を用いて本発明について詳細に説明する。<Examples> Hereinafter, the present invention will be described in detail with reference to the drawings.
第１図は本発明の一実施例における概略構成図である。
ここで、投写表示装置本体１の投写用レンズ４から出た
画像情報はスクリーン５に映し出されるわけであるが、
この際投写画像部６の外側側近光７の光量を受光装置３
を介して測定する。FIG. 1 is a schematic configuration diagram in an embodiment of the present invention.
Here, the image information output from the projection lens 4 of the main body 1 of the projection display apparatus is displayed on the screen 5.
At this time, the light quantity of the near light 7 on the outer side of the projection image section 6 is set to the light receiving device 3
Measure through.
この受光装置３は連動装置２によって投写用レンズの焦
点変化に合わせ焦点変化する為、常に投写画像に対比し
たスクリーン部の明るさを周囲光量として測定するもの
である。Since the light receiving device 3 changes the focus in accordance with the change in the focus of the projection lens by the interlocking device 2, the brightness of the screen portion, which is always compared with the projected image, is measured as the ambient light amount.
更に第２図は投写型表示装置本体１の内部構成を概略ブ
ロック図で表わした図である。Further, FIG. 2 is a schematic block diagram showing the internal structure of the projection display apparatus main body 1.
前述第１図で説明した周囲光量測定光７は連動装置２に
よって投写レンズ４の焦点と連動した受光装置３のレン
ズに到達し受光装置３内部の受光素子により電気信号に
変換され信号増幅器11を通り光量制御電源装置12に送ら
れる。このフィードバック量により投写光源10の光源電
圧もしくは電流がコントロールされ投写光量が制御され
る結果となる。The ambient light quantity measuring light 7 described with reference to FIG. 1 reaches the lens of the light receiving device 3 which is interlocked with the focus of the projection lens 4 by the interlocking device 2, is converted into an electric signal by the light receiving element inside the light receiving device 3, and the signal amplifier 11 is supplied. It is sent to the light amount control power supply device 12. This feedback amount controls the light source voltage or current of the projection light source 10 to control the projection light amount.
又、画像出力用ライトバルブ８は画像情報を投写光に与
える働きをするものであって、その制御をライトバルブ
制御装置９が行なっている。ここでライトバルブ８には
TFTやアモルファスシリコン等を用いたアクティブマト
リクス液晶表示体やTN型液晶を使ったパッシタイプの液
晶表示体又はレーザー書込みの液晶表示体あるいはスラ
イドフィルム等々多様な画像表示媒体の使用が可能であ
りこれら表示体の違いによりライトバルブ制御装置９内
部の詳細はそれぞれ異なるものである。更に連動装置２
は本例図面では歯車を用いて連動作用を得ているが、タ
イミングベルトやスライド式ローラー等４の焦点調整機
構に合わせてその具体的構造は異なるものであっても問
題ない事を付記しておく。The image output light valve 8 has a function of giving image information to the projection light, and the light valve control device 9 controls it. Here the light valve 8
It is possible to use various image display media such as active matrix liquid crystal display using TFT or amorphous silicon, passive type liquid crystal display using TN type liquid crystal, laser writing liquid crystal display or slide film. The details inside the light valve control device 9 are different depending on the body. Further interlocking device 2
In the drawings of this example, gears are used to achieve the interlocking action, but it should be noted that there is no problem even if the specific structure is different according to the focus adjusting mechanism of the timing belt, the slide type roller or the like 4. deep.
次に第３図により３〜10への信号処理系の詳細について
説明する。Next, the details of the signal processing system for 3 to 10 will be described with reference to FIG.
本例は受光装置３にCdS（カドミウム・セレン）を受光
素子として用いたものである。ここで、受光装置３に入
射した測定外来光はその光量により受光装置３の抵抗値
を変化させるが、この場合光量が多いほど受光装置３の
抵抗値を下げる。すなわち、スクリーン上の投写画像部
外側側近光量が多く周囲が明るい場合、抵抗13との抵抗
分割比によりV1点の電圧レベルが上昇し抵抗14,15,16及
びOPアンプ17で構成する非反転増幅器により信号増幅さ
れV2電圧を更に上昇させ、投写光源10のコントロールト
ランジスタ18のベース電流I1及びコレクタ電流I2すなわ
ちランプ電流を増加させ投写光量を増加させて投写画像
をより明るい方向に変更させるのである。又、この逆に
スクリーン上の投写画像部外側側近光量７が少なく周囲
が暗い場合、３の抵抗値が上昇しその結果V1のレベルが
低下し、それに伴いV2のレベル低下が起こり更にI1及び
I2の電流が減少し投写光源の光量が減り適正輝度まで投
写画像の明るさを下げる働きをするのである。In this example, the light receiving device 3 uses CdS (cadmium selenium) as a light receiving element. Here, the resistance value of the light-receiving device 3 changes depending on the amount of the measurement external light that has entered the light-receiving device 3. In this case, the larger the light amount, the lower the resistance value of the light-receiving device 3. That is, when the amount of near light on the outside of the projected image on the screen is large and the surroundings are bright, the voltage level at point V 1 rises due to the resistance division ratio with resistor 13, and the non-inversion composed of resistors 14, 15, 16 and OP amplifier 17 The signal is amplified by the amplifier and the V 2 voltage is further raised, and the base current I 1 and collector current I 2 of the control transistor 18 of the projection light source 10, that is, the lamp current is increased to increase the projection light amount and change the projected image to a brighter direction. Let them do it. On the contrary, when the amount of near light 7 on the outer side of the projected image portion on the screen is small and the surroundings are dark, the resistance value of 3 increases, and as a result, the level of V 1 decreases, and the level of V 2 decreases accordingly. 1 and
The current of I 2 is reduced and the light amount of the projection light source is reduced, which serves to reduce the brightness of the projected image to the proper brightness.
第４図は受光装置３の受光素子としてフォトトランジス
タを用いた時の実施例詳細説明図である。ここで前述実
施例同様受光装置３に入射した測定外来光はこの光量に
より受光装置３の等化抵抗値を変化させるが、この場合
光量が多いほど受光装置３の抵抗値を下げる。よって抵
抗19との分圧によりV3点電圧が低下するが、抵抗20,21,
22及びOPアンプ17で構成された反転増幅器により信号の
反転増幅がされV4の電圧が上昇しコントロールトランジ
スタ18のI1I2が上昇し投写光源の明るさが増しその結果
投写画像の明るさが適正輝度まで明るくなるのである。FIG. 4 is a detailed explanatory diagram of an embodiment when a phototransistor is used as a light receiving element of the light receiving device 3. Here, the measurement external light incident on the light receiving device 3 changes the equalization resistance value of the light receiving device 3 according to this light amount as in the above-described embodiment. In this case, the resistance value of the light receiving device 3 decreases as the light amount increases. Therefore, the voltage at the V 3 point decreases due to the voltage division with the resistor 19, but the resistors 20, 21,
The signal is inverted and amplified by the inverting amplifier composed of 22 and the OP amplifier 17, the voltage of V 4 rises, the I 1 I 2 of the control transistor 18 rises, the brightness of the projection light source increases, and as a result, the brightness of the projected image increases. Is brightened to the proper brightness.
又、スクリーン上の投写画像外側側近光量が少なく周囲
が暗い場合は受光装置３の抵抗値が上りV3点電圧が上昇
しV4点の電圧が低下しI1I2が減少して投写光源の光量が
適正輝度まで下げられ常に周囲の明るさに適した投写画
像輝度が得られるように自動的に働くものである。以上
第３図，第４図共に投写光源電源に直流を用いた例につ
いて説明して来たが、交流電源を用いた実施例について
第５図により詳細に説明する。When the amount of near light on the outer side of the projected image on the screen is small and the surroundings are dark, the resistance value of the light receiving device 3 increases, the voltage at the V 3 point increases, the voltage at the V 4 point decreases, and I 1 I 2 decreases and the projection light source decreases. The amount of light is reduced to an appropriate brightness, and it automatically works so that a projection image brightness suitable for ambient brightness is always obtained. 3 and 4 have been described above using the direct current as the power source of the projection light source, an embodiment using the alternating current power source will be described in detail with reference to FIG.
さて、ここでは第３図の時と同様に受光素子３から入射
した検出光によりV1の電位が変化し抵抗器14〜16及びOP
アンプ17で構成された非反転増幅器により信号増幅が成
され出力V2が得られる。Now, here, as in the case of FIG. 3, the potential of V 1 is changed by the detection light incident from the light receiving element 3, and the resistors 14 to 16 and OP
The signal is amplified by the non-inverting amplifier composed of the amplifier 17, and the output V 2 is obtained.
このV2の結果がFET23のゲート入力として供給される
が、FET23はV2によりその等化抵抗値がV2が高い時すな
わち検出入射外光量が多い時は低い方向へ、反対にV2が
低い時は抵抗値が高い方向へ変化するので、抵抗24及び
コンデンサ25で構成された位相回路のコンデンサ端子電
圧V5交流電源30の電圧振幅をV2により制御された出力を
発生する。更にV5はトリガーダイオード26に供給され、
V5がトリガーダイオード26のブレークオーバー電圧に達
するとダイオードスイッチがONとなりコンデンサ25がト
ライアック27のトリガー電圧をトリガーダイオード26を
介して放電し、トライアック27がON状態となりランプ電
流I3流れる。ここでV5は交流電圧であるのでI3は一定時
間流れた後OFFとなり次の周期では逆方向の電流−I3と
して連続動作として流す結果となる。ここでV2の変化に
よりFET23の等化抵抗値が変化する事はコンデンサ25の
充電時間を変化させる事にほかならず、検出外光量が増
加しV2が高くなればFET23の抵抗値が低下しコンデンサ2
5の充電速度が速くなりトライアック27のON時間が長く
なって投写光源10の光量が増すのである。又、反対に検
出外光量が低下しV2が低くなればFET23の抵抗値が高く
なりコンデンサ25の充電速度が遅くなりトライアック27
のON時間が短くなって投写光源10の光量が低下し、スク
リーン上測定部の明るさ変化に対し投写光量が常にコン
トロールされるしくみになっている。又、図中28,29の
抵抗器及びコンデンサはON・OFF時のサージ電圧による
素子の破壊及び誤動作防止の為に使用している。Results of the V 2 is supplied as the gate input of FET 23, FET 23 is the lower direction when the time i.e. detection incident outside light intensity equalizing resistance thereof is high V 2 by V 2 is large, the V 2 in the opposite When the resistance value is low, the resistance value changes to a high direction, so that an output in which the voltage amplitude of the capacitor terminal voltage V 5 of the AC power supply 30 of the phase circuit configured by the resistor 24 and the capacitor 25 is controlled by V 2 is generated. Furthermore, V 5 is supplied to the trigger diode 26,
When V 5 reaches the breakover voltage of the trigger diode 26, the diode switch is turned on, the capacitor 25 discharges the trigger voltage of the triac 27 through the trigger diode 26, the triac 27 is turned on, and the lamp current I 3 flows. Here, since V 5 is an AC voltage, I 3 is turned off after flowing for a certain period of time, and in the next cycle, the current flows in the reverse direction as −I 3 , resulting in continuous operation. Here, the change in the equalization resistance value of the FET 23 due to the change in V 2 is nothing but the change in the charging time of the capacitor 25, and the resistance value of the FET 23 decreases as the outside detection light amount increases and V 2 increases. Capacitor 2
The charging speed of 5 becomes faster, the ON time of the triac 27 becomes longer, and the light amount of the projection light source 10 increases. On the other hand, if the amount of outside light detected decreases and V 2 decreases, the resistance value of FET 23 increases and the charging speed of capacitor 25 slows down.
The ON time is shortened, the light quantity of the projection light source 10 is reduced, and the projection light quantity is always controlled according to the change in the brightness of the measurement section on the screen. In addition, resistors and capacitors 28 and 29 in the figure are used to prevent device damage and malfunction due to surge voltage during ON / OFF.
＜発明の効果＞ 本発明の投写型表示装置は、 スクリーンと表示装置との距離に応じ投写レンズ及び受
光レンズの焦点距離を連動的に変化させる連動手段を備
えたため、 フロント側から投写する投写型表示装置におけるスクリ
ーンと表示装置との距離に応じて焦点距離が変化すると
きに、受光素子とスクリーンの側近光との焦点距離も連
動的に変化させることができ、表示装置の配設位置に応
じて正確なコントラスト調整をすることができる。さら
に、スクリーン上に受光素子を設けていないため、スク
リーンと表示装置とを有線等で接続する必要がないため
装置がコンパクトになるという効果を奏する。<Effects of the Invention> The projection display device of the present invention is provided with the interlocking means for interlockingly changing the focal lengths of the projection lens and the light-receiving lens according to the distance between the screen and the display device. When the focal length changes in accordance with the distance between the screen and the display device in the display device, the focal length between the light receiving element and the near side light of the screen can also be changed interlockingly, and the focal position can be changed according to the position where the display device is arranged. You can adjust the contrast accurately. Further, since the light receiving element is not provided on the screen, it is not necessary to connect the screen and the display device by wire or the like, so that the device can be made compact.
第１図は本発明の概略構成図。 第２図は本発明の本体内部ブロック図。 第３図は本発明の直流電流コントロール時の一実施例説
明図。 第４図は本発明の直流電源コントロール時の一実施例説
明図。 第５図は本発明の交流電源コントロール時の一実施例説
明図。を示し、 図中、１……投写表示装置本体、２……連動装置、３…
…受光装置、４……投写用レンズ、５……投写スクリー
ン、６……投写画像部、７……外側側近光、８……ライ
トバルブ、９……ライトバルブ制御装置、10……投写光
源、11……信号増幅器 を表わす。FIG. 1 is a schematic configuration diagram of the present invention. FIG. 2 is an internal block diagram of the main body of the present invention. FIG. 3 is an explanatory view of an embodiment of the present invention at the time of controlling the direct current. FIG. 4 is an explanatory view of an embodiment when controlling the DC power supply of the present invention. FIG. 5 is an explanatory view of an embodiment when controlling the AC power supply of the present invention. In the figure, 1 ... Projection display device main body, 2 ... Interlocking device, 3 ...
... light receiving device, 4 ... projection lens, 5 ... projection screen, 6 ... projection image part, 7 ... outer side near light, 8 ... light valve, 9 ... light valve control device, 10 ... projection light source , 11 ... Represents a signal amplifier.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 矢島 章隆 長野県諏訪市大和３丁目３番５号 セイコ ーエプソン株式会社内 (72)発明者 曽根原 富雄 長野県諏訪市大和３丁目３番５号 セイコ ーエプソン株式会社内 (72)発明者 有賀 修二 長野県諏訪市大和３丁目３番５号 セイコ ーエプソン株式会社内 (56)参考文献 実開 昭61−61536（ＪＰ，Ｕ) 実公 昭46−36611（ＪＰ，Ｙ１) 実公 昭42−18610（ＪＰ，Ｙ１) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akitaka Yajima 3-3-5 Yamato, Suwa, Nagano Seiko Epson Co., Ltd. (72) Tomio Sonehara 3-3-5 Yamato, Suwa, Nagano Prefecture Seiko -In Epson Corporation (72) Inventor Shuji Ariga 3-3-5 Yamato, Suwa-shi, Nagano Seiko-In Epson Corporation (56) Bibliography Sho 61-61536 (JP, U) Suiko 46-36611 ( JP, Y1) Jitsuko Sho 42-18610 (JP, Y1)
Claims (1)
ンズとを介して表面側からスクリーンに画像データを投
写する投写型表示装置において、 前記スクリーンに投写された前記画像データ近傍の側近
光量を受光レンズを介して受光素子により測定し電気信
号に変換する受光手段と、 前記受光手段の出力に応じて前記投写光源の光量を調整
する光量制御手段と、 前記スクリーンと前記表示装置との距離に応じ前記投写
レンズ及び前記受光レンズの焦点距離を連動的に変化さ
せる連動手段と、 を備えたことを特徴とする投写型表示装置。1. A projection display device for projecting image data from a front surface side of a light from a projection light source through a light valve and a projection lens onto a screen, wherein the amount of near light near the image data projected onto the screen is adjusted. A light receiving unit that measures by a light receiving element via a light receiving lens and converts into an electric signal, a light amount control unit that adjusts the light amount of the projection light source according to the output of the light receiving unit, and a distance between the screen and the display device. According to another aspect of the present invention, there is provided a projection display device comprising: interlocking means for interlockingly changing the focal lengths of the projection lens and the light receiving lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61011387A JPH0756539B2 (en) | 1986-01-22 | 1986-01-22 | Projection display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61011387A JPH0756539B2 (en) | 1986-01-22 | 1986-01-22 | Projection display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62169118A JPS62169118A (en) | 1987-07-25 |
| JPH0756539B2 true JPH0756539B2 (en) | 1995-06-14 |
Family
ID=11776597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61011387A Expired - Lifetime JPH0756539B2 (en) | 1986-01-22 | 1986-01-22 | Projection display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0756539B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2903604B2 (en) * | 1990-03-01 | 1999-06-07 | 三菱電機株式会社 | Image display device |
| KR100370174B1 (en) * | 1999-02-20 | 2003-01-30 | 김석배 | Screen linkage type stereophonic light system |
| JP3640173B2 (en) * | 2001-04-02 | 2005-04-20 | ソニー株式会社 | Image display device |
| JP4497890B2 (en) * | 2003-10-30 | 2010-07-07 | キヤノン株式会社 | Projection type image display device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4218610Y1 (en) * | 1964-12-27 | 1967-10-27 |
-
1986
- 1986-01-22 JP JP61011387A patent/JPH0756539B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62169118A (en) | 1987-07-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |