JPH0269084A - Projection picture display device - Google Patents

Projection picture display device

Info

Publication number
JPH0269084A
JPH0269084A JP22094088A JP22094088A JPH0269084A JP H0269084 A JPH0269084 A JP H0269084A JP 22094088 A JP22094088 A JP 22094088A JP 22094088 A JP22094088 A JP 22094088A JP H0269084 A JPH0269084 A JP H0269084A
Authority
JP
Japan
Prior art keywords
display device
image display
turned
circuit
time
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
Application number
JP22094088A
Other languages
Japanese (ja)
Other versions
JPH0681288B2 (en
Inventor
Tsutomu Muraji
努 連
Yoshito Miyatake
義人 宮武
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP22094088A priority Critical patent/JPH0681288B2/en
Publication of JPH0269084A publication Critical patent/JPH0269084A/en
Publication of JPH0681288B2 publication Critical patent/JPH0681288B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To suppress the using frequency of an instantaneous relighting circuit and the futile lighting time of a discharge lamp by turning on the power supply to the circuit only when a main power switch is turned on during fixed time after prescribed delay time to the turning off of power supply. CONSTITUTION:During the period (DELTAt1) from the turning off time T1 of a main power switch 9 to the turning off time T2 of a discharge lamp 1, the lamp 1 is turned on since the power supply to a lighting circuit 6 is continued. During the period (DELTAt2) from the turning off time T2 to the re-lighting possible time T3, the power supply to the circuit 6 is turned off and the lamp 1 is turned off. Simultaneously with the turning on of the switch 9, the power switch 11 to an instantaneous re-lighting circuit 7 is turned on and the circuit 7 generates high-voltage pulses of about 30kV, by which the discharge lamp 1 is instantaneously turned on. Since the power supply to a picture display circuit 8 is simultaneously turned on, a picture can be formed on a screen 5 by means of a picture display device 3.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、液晶表示装置に代表されるような光変調画像
表示装置をライトバルブとして用いた投写型画像表示装
置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a projection type image display device using a light modulation image display device such as a liquid crystal display device as a light valve.

従来の技術 大画面のテレビジョン画像を得るために、比較的小さな
液晶表示装置に透過率の変化として映像信号に応じた光
学像を形成し、この光学像をランプからの放射光で照射
するとともに投写レンズによりスクリーン上に投写する
方法が従来からよく知られている(例えば、5ID86
ダイジエスト375ページ)、このような液晶表示装置
をライトバルブとして用いた投写型画像表示装置の従来
の構成例を第2図に示す。
Conventional technology In order to obtain a large-screen television image, an optical image is formed on a relatively small liquid crystal display device as a change in transmittance in accordance with the video signal, and this optical image is illuminated with light emitted from a lamp. A method of projecting onto a screen using a projection lens is well known (for example, 5ID86).
FIG. 2 shows an example of a conventional configuration of a projection type image display device using such a liquid crystal display device as a light valve.

第2図において、ランプ21から放射される光は集光光
学装置22により平行に近い光に変換され、液晶表示装
置23を透過して投写レンズ24に入射する。液晶表示
装置23には透過率の変化として映像信号に応じた光学
像が形成され、この光学像は投写レンズ24によりスク
リーン25上に投写される。ランプ21は、ハロゲンラ
ンプ、キセノンランプ、メタルハライドランプなどを用
いるとよい。また、電力源29からランプ21を点燈す
る点燈回路26への電力供給のオン及びオフは、主電源
スイッチ28のオン及びオフと同時に行われる。
In FIG. 2, light emitted from a lamp 21 is converted into nearly parallel light by a condensing optical device 22, passes through a liquid crystal display device 23, and enters a projection lens 24. An optical image corresponding to the video signal is formed on the liquid crystal display device 23 as a change in transmittance, and this optical image is projected onto the screen 25 by the projection lens 24. As the lamp 21, a halogen lamp, a xenon lamp, a metal halide lamp, or the like may be used. Further, the power supply from the power source 29 to the lighting circuit 26 for lighting the lamp 21 is turned on and off at the same time as the main power switch 28 is turned on and off.

発明が解決しようとする課題 しかしながら、第3図に示した構成においてランプにメ
タルハライドランプを用いる場合、メタルハライドラン
プは再始動時間が長いために次のような問題があった0
例えばリモコン使用中に誤操作により主電源スイッチを
オフにするとランプは即座に消煙するが、誤操作に気付
いて主電源スイッチをオンにしても通常ランプは即座に
は点燈しない、これは視聴者にとって非常に不便である
Problems to be Solved by the Invention However, when a metal halide lamp is used as the lamp in the configuration shown in FIG. 3, the metal halide lamp has the following problems due to its long restart time.
For example, if you turn off the main power switch by mistake while using the remote control, the lamp will immediately extinguish smoke, but even if you notice the mistake and turn on the main power switch, normally the lamp will not turn on immediately, which is a problem for viewers. Very inconvenient.

また、再始動時のみ30kV程度の高電圧パルスを用い
ればメタルハライドランプを瞬時に再始動することが出
来るが1、高電圧パルス印加時にランプを構成する電極
が著しく劣化するなどの問題点があった。
Additionally, metal halide lamps can be restarted instantaneously by using a high voltage pulse of about 30 kV only at the time of restart.1 However, there are problems such as significant deterioration of the electrodes that make up the lamp when a high voltage pulse is applied. .

本発明は、再始動時間の長い金属蒸気放電燈を用いるに
もかかわらず、主電源スイッチをオフにした直後に主電
源スイッチをオンする場合においても即座に画像を表示
できる長寿命の投写型画像表示装置を提供することを目
的としている。
Although the present invention uses a metal vapor discharge lamp with a long restart time, the present invention provides a long-life projection type imager that can display an image immediately even when the main power switch is turned on immediately after the main power switch is turned off. The purpose is to provide a display device.

課題を解決するための手段 上記目的を達成するために、本発明の投写型画像表示装
置は、金属蒸気放電燈と、前記金属蒸気放電燈を点燈す
る点燈回路と前記金属蒸気放電燈を瞬時に再始動させる
ための瞬時再点燈回路と、画像情報に応じて光を変調す
る画像表示装置と、前記画像表示装置を動作させる画像
表示回路と、前記金属蒸気放電燈から放射される光を、
前記画像表示装置に照射するとともにスクリーン上に投
写する光学装置を具備し、前記点燈回路の電力供給のオ
フは、主電源スイッチのオフによる前記点燈回路以外の
回路の電力供給のオフに対し所定の遅延時間を有し、前
記所定の遅延時間以後ある一定の時間内においての主電
源スイッチのオン時においてのみ、瞬時再点燈回路の電
力供給をオンするように構成したものである。
Means for Solving the Problems In order to achieve the above object, a projection type image display device of the present invention includes a metal vapor discharge lamp, a lighting circuit for lighting the metal vapor discharge lamp, and a lighting circuit for lighting the metal vapor discharge lamp. An instant re-lighting circuit for instantaneous restart, an image display device that modulates light according to image information, an image display circuit that operates the image display device, and light emitted from the metal vapor discharge lamp. of,
An optical device is provided for projecting light onto the image display device and onto a screen, and turning off the power supply to the lighting circuit is performed in response to turning off the power supply to circuits other than the lighting circuit by turning off the main power switch. It has a predetermined delay time, and is configured to turn on the power supply to the instantaneous re-lighting circuit only when the main power switch is turned on within a certain period of time after the predetermined delay time.

作用 本発明は上記した構成によって、リモコン使用時の誤操
作などによる、主電源スイッチのオフの後即座に再び前
記主電源スイッチをオンする時など所定の遅延時間内に
おいては、金属蒸気放電燈の瞬時の再起動を行う必要な
く画像を表示することができ、前記所定の遅延時間以後
においても瞬時の再点燈が行える。
Effect of the Invention With the above-described configuration, the present invention has the above-mentioned structure, so that when the main power switch is turned off and then immediately turned on again due to an erroneous operation when using a remote control, the instantaneous power of the metal vapor discharge lamp is reduced within a predetermined delay time. Images can be displayed without the need for restarting, and instantaneous re-lighting can be performed even after the predetermined delay time.

実施例 以下、本発明の一実施例の投写型画像表示装置について
図面を参照しながら説明する。
Embodiment Hereinafter, a projection type image display device according to an embodiment of the present invention will be described with reference to the drawings.

第1図は、本発明の一実施例における要部構成図である
。1は放電燈、2は集光光学装置、3は画像表示装置、
4は投写レンズ、5はスクリーン、6は点燈回路、7は
瞬時再点燈回路、8は画像表示回路、9は主電源スイッ
チである。第1図において、放電燈1から放射される光
は集光光学装置2により平行に近い光に変換され、画像
表示装置3を透過して投写レンズ4に入射する0画像表
示装置3は液晶表示装置であり透過率の変化として映像
信号に応じた光学像が形成され、この光学像は投写レン
ズ4によりスクリーン5上に投写される。放電燈1はメ
タルハライドランプ、水銀ランプ、ナトリウムランプな
どの金属蒸気放電燈を使用することができ、特にメタル
ハライドランプはランプ効率、ランプ寿命が良好であり
、発光スペクトルも画像表示装置に好適な特性となって
いる。
FIG. 1 is a block diagram of main parts in an embodiment of the present invention. 1 is a discharge lamp, 2 is a condensing optical device, 3 is an image display device,
4 is a projection lens, 5 is a screen, 6 is a lighting circuit, 7 is an instantaneous re-lighting circuit, 8 is an image display circuit, and 9 is a main power switch. In FIG. 1, light emitted from a discharge lamp 1 is converted into nearly parallel light by a condensing optical device 2, passes through an image display device 3, and enters a projection lens 4.The image display device 3 is a liquid crystal display. This device forms an optical image according to a video signal as a change in transmittance, and this optical image is projected onto a screen 5 by a projection lens 4. As the discharge lamp 1, a metal vapor discharge lamp such as a metal halide lamp, a mercury lamp, or a sodium lamp can be used. In particular, a metal halide lamp has good lamp efficiency and lamp life, and its emission spectrum has characteristics suitable for image display devices. It has become.

第2図は、遅延回路の遅延時間を示すタイミングチャー
トである。第2図において、T1は主電源スイッチオフ
時刻、T2は放電燈消煙時刻であり主電源スイッチオフ
時刻T1より第1の遅延回路13の遅延時間Δt1によ
り決められる。T3は再点燈可能限界時刻であり、放電
燈消煙時刻T2より放電燈1が瞬時再点燈回路7により
瞬時再点燈が可能である時間の限界である。Δt2は第
2の遅延回路14の遅延時間であり放電燈消燈時刻T2
から再点燈可能限界時刻T3までの時間である。
FIG. 2 is a timing chart showing the delay time of the delay circuit. In FIG. 2, T1 is the main power switch-off time, and T2 is the discharge lamp smoke extinguishing time, which is determined by the delay time Δt1 of the first delay circuit 13 from the main power switch-off time T1. T3 is the limit time for relighting, which is the limit of time during which the instantaneous relighting circuit 7 can instantaneously relight the discharge lamp 1 from the discharge lamp extinguishing time T2. Δt2 is the delay time of the second delay circuit 14, and the discharge light extinguishing time T2
This is the time from the time to the re-lighting limit time T3.

主電源スイッチ9のオフ時において、主電源スイッチオ
フ時刻T、に電力源15より画像表示回路8への電力供
給はオフされ、画像表示装置3は光遮断状態となりスク
リーン5上には画像は表示されない、さらに主電源スイ
ッチオフ時刻T1より第1の遅延回路13の遅延時間Δ
t1の後、即ち放電燈消煙時刻T2に点燈回路電源スィ
ッチ10がオフし電力源15より点燈回路6への電力供
給はオフされ放電環1は消燈される。
When the main power switch 9 is turned off, the power supply from the power source 15 to the image display circuit 8 is turned off at the main power switch off time T, and the image display device 3 is in a light-blocking state and no image is displayed on the screen 5. Furthermore, the delay time Δ of the first delay circuit 13 from the main power switch-off time T1
After t1, that is, at discharge lamp extinguishing time T2, the lighting circuit power switch 10 is turned off, the power supply from the power source 15 to the lighting circuit 6 is turned off, and the discharge ring 1 is extinguished.

主電源スイッチ9のオン時において、まず主電源スイッ
チオフ時刻T1から放電燈消煙時刻T2の間(Δ11)
においては、点燈回路6への電力供給はオンされている
ので放電環lは点燈されており、主電源スイッチ9がオ
ンされると同時に画像表示回路8への電力供給がオンさ
れ画像表示装置3によりスクリーン5上に画像を形成す
る0次に放電燈消煙時刻T2から再点燈可能時刻T8の
間(Δ12)においては、点燈回路6への電力供給はオ
フされているので放電環1は消燈されており、主電源ス
イッチ9がオンされると同時に瞬時再点燈回路電源スイ
ッチ制御回路12により瞬時再点燈回路電源スイッチ1
1がオンされ瞬時再点燈回路7により30kV程度の高
電圧パルスが発生され放電環1は瞬時に再点燈される。
When the main power switch 9 is turned on, first, between the main power switch off time T1 and the discharge lamp smoke extinguishing time T2 (Δ11)
In , the power supply to the lighting circuit 6 is turned on, so the discharge ring 1 is lit, and at the same time as the main power switch 9 is turned on, the power supply to the image display circuit 8 is turned on and the image is displayed. During the period (Δ12) from the zero-order discharge lamp smoke extinguishing time T2 when an image is formed on the screen 5 by the device 3 to the re-lighting possible time T8, the power supply to the lighting circuit 6 is turned off, so that no discharge occurs. The ring 1 is turned off, and at the same time as the main power switch 9 is turned on, the instantaneous re-lighting circuit power switch control circuit 12 turns on the instantaneous re-lighting circuit power switch 1.
1 is turned on, a high voltage pulse of about 30 kV is generated by the instantaneous re-lighting circuit 7, and the discharge ring 1 is instantaneously re-lit.

それと同時に画像表示回路8への電力供給も同時にオン
されるので画像表示装置3によりスクリーン5上に画像
を形成する。さらに再点燈可能限界時刻T8の後におい
ては、点燈回路6への電力供給はオフされているので放
電環lは消燈されており、主電源スイッチ9がオンされ
ると同時に点燈回路電源スィッチ10がオンされ電力源
I5より点燈回路6及び画像表示回路8へ電力供給がお
こなわれ、画像表示装置3によりスクリーン5上に画像
を形成する。
At the same time, the power supply to the image display circuit 8 is also turned on, so that the image display device 3 forms an image on the screen 5. Further, after the re-lighting limit time T8, the power supply to the lighting circuit 6 is turned off, so the discharge ring 1 is turned off, and at the same time when the main power switch 9 is turned on, the lighting circuit 6 is turned off. The power switch 10 is turned on, power is supplied from the power source I5 to the lighting circuit 6 and the image display circuit 8, and an image is formed on the screen 5 by the image display device 3.

上記の第1の遅延回路の遅延時間Δt、を視聴者の誤操
作に気が付く時間程度に設定することにより、スクリー
ン5上への画像形成を視聴者に不便を感じさせることな
く出来る。
By setting the delay time Δt of the first delay circuit to a time at which the viewer notices an erroneous operation, it is possible to form an image on the screen 5 without causing any inconvenience to the viewer.

なお、上述した説明では画像表示装置として液晶表示装
置を用いているが、電気光学結晶など電気信号により光
学的特性の変化として画像を表示できるものであれば、
どのようなものでもさしつかえない。
In the above explanation, a liquid crystal display device is used as an image display device, but any device such as an electro-optic crystal that can display an image as a change in optical characteristics by an electric signal may be used.
Anything is fine.

発明の効果 以上述べたごとく本発明によれば、点燈回路の電力供給
のオフは、主電源スイッチのオフによる前記点燈回路以
外の回路の電力供給のオフに対し所定の遅延時間を有し
、前記所定の遅延時間以後ある一定の時間内においての
主電源スイッチのオン時においてのみ、瞬時再点燈回路
の電力供給をオンするように構成しているので、再始動
時間の長い金属蒸気放電環を用いるにもかかわらず、電
極劣化を招き易い高電圧パルス発生回路、即ち瞬時再点
燈回路の使用頻度を極力抑え、さらに放電環の無駄な点
燈時間即ち画像表示装置の光遮断状態時における放電環
の点燈時間をも抑えることができるので非常に大きな効
果がある。
Effects of the Invention As described above, according to the present invention, turning off the power supply to the lighting circuit has a predetermined delay time with respect to turning off the power supply to circuits other than the lighting circuit due to turning off the main power switch. , the power supply to the instantaneous restart circuit is turned on only when the main power switch is turned on within a certain period of time after the predetermined delay time, so that metal vapor discharge with a long restart time is avoided. Despite the use of a ring, the frequency of use of the high-voltage pulse generation circuit, that is, the instantaneous re-lighting circuit, which tends to cause electrode deterioration, is minimized, and the unnecessary lighting time of the discharge ring, that is, when the image display device is in a light-blocking state, is minimized. This has a very large effect because it can also reduce the lighting time of the discharge ring.

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

第1図は、本発明の一実施例における投写型画像表示装
置の要部構成図、第2図は、遅延回路の遅延時間を示す
タイミングチャート、第3図は、従来例を示す投写型画
像表示装置の要部構成図である。 ■・・・・・・放電環、2,22・・・・・・集光光学
装置、3゜23・・・・・・画像表示装置、4,24・
・・・・・投写レンズ、5.25・・・・・・スクリー
ン、6.26・・・・・・点燈回路、7・・・・・・瞬
時再点燈回路、8.27・・・・・・画像表示回路、9
.−28・・・・・・主電源スイッチ。
FIG. 1 is a configuration diagram of main parts of a projection type image display device according to an embodiment of the present invention, FIG. 2 is a timing chart showing the delay time of a delay circuit, and FIG. 3 is a projection type image display device showing a conventional example. FIG. 2 is a configuration diagram of main parts of a display device. ■...Discharge ring, 2,22...Condensing optical device, 3゜23...Image display device, 4,24...
...Projection lens, 5.25...Screen, 6.26...Lighting circuit, 7...Momentary re-lighting circuit, 8.27... ...Image display circuit, 9
.. -28... Main power switch.

Claims (2)

【特許請求の範囲】[Claims] (1)金属蒸気放電燈と、前記金属蒸気放電燈を点燈す
る点燈回路と前記金属蒸気放電燈を瞬時に再始動させる
ための瞬時再点燈回路と、画像情報に応じて光を変調す
る画像表示装置と、前記画像表示装置を動作させる画像
表示回路と、前記金属蒸気放電燈から放射される光を前
記画像表示装置に照射するとともにスクリーン上に投写
する光学装置とを具備し、前記点燈回路の電力供給のオ
フは、主電源スイッチのオフによる前記点燈回路以外の
回路の電力供給のオフに対し所定の遅延時間を有し、前
記所定の遅延時間以後ある一定の時間内においての主電
源スイッチのオン時においてのみ、瞬時再点燈回路の電
力供給をオンすることを特徴とする投写型画像表示装置
(1) A metal vapor discharge lamp, a lighting circuit for lighting the metal vapor discharge lamp, an instantaneous re-lighting circuit for instantaneously restarting the metal vapor discharge lamp, and modulation of light according to image information. an image display device that operates the image display device, an image display circuit that operates the image display device, and an optical device that irradiates the image display device with light emitted from the metal vapor discharge lamp and projects the light onto a screen; Turning off the power supply to the lighting circuit has a predetermined delay time with respect to turning off the power supply to circuits other than the lighting circuit due to turning off the main power switch, and within a certain period of time after the predetermined delay time. A projection type image display device characterized in that the power supply to the instantaneous re-lighting circuit is turned on only when the main power switch of the projection type image display device is turned on.
(2)画像表示回路の電力供給のオフ期間において、画
像表示装置は光遮断状態になることを特徴とする請求項
(1)記載の投写型画像表示装置。
(2) The projection type image display device according to claim 1, wherein the image display device is in a light-blocking state during a period when power supply to the image display circuit is off.
JP22094088A 1988-09-02 1988-09-02 Projection type image display device Expired - Fee Related JPH0681288B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22094088A JPH0681288B2 (en) 1988-09-02 1988-09-02 Projection type image display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22094088A JPH0681288B2 (en) 1988-09-02 1988-09-02 Projection type image display device

Publications (2)

Publication Number Publication Date
JPH0269084A true JPH0269084A (en) 1990-03-08
JPH0681288B2 JPH0681288B2 (en) 1994-10-12

Family

ID=16758942

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22094088A Expired - Fee Related JPH0681288B2 (en) 1988-09-02 1988-09-02 Projection type image display device

Country Status (1)

Country Link
JP (1) JPH0681288B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5134491A (en) * 1990-01-18 1992-07-28 Matsushita Electric Industrial Co., Ltd. Projection type image display apparatus
EP0913996A1 (en) * 1997-11-03 1999-05-06 SONY-WEGA PRODUKTIONS GmbH Power supply control

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5134491A (en) * 1990-01-18 1992-07-28 Matsushita Electric Industrial Co., Ltd. Projection type image display apparatus
EP0913996A1 (en) * 1997-11-03 1999-05-06 SONY-WEGA PRODUKTIONS GmbH Power supply control

Also Published As

Publication number Publication date
JPH0681288B2 (en) 1994-10-12

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