JP3389957B2 - Display protection circuit - Google Patents
Display protection circuitInfo
- Publication number
- JP3389957B2 JP3389957B2 JP02005295A JP2005295A JP3389957B2 JP 3389957 B2 JP3389957 B2 JP 3389957B2 JP 02005295 A JP02005295 A JP 02005295A JP 2005295 A JP2005295 A JP 2005295A JP 3389957 B2 JP3389957 B2 JP 3389957B2
- Authority
- JP
- Japan
- Prior art keywords
- video signal
- unit
- display
- switch
- protection circuit
- 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 - Fee Related
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Controls And Circuits For Display Device (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は表示器の保護回路に係
り、表示器の同一箇所が、高輝度で、かつ所要時間以上
連続して点灯された場合に映像信号を反転し、焼付きに
よる表示機能の劣化を防止するものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective circuit for a display device, which inverts a video signal when the same portion of the display device is illuminated with high brightness and continuously for a required time or longer, and is burned. The present invention relates to a device that prevents deterioration of the display function.
【０００２】[0002]
【従来の技術】同一の画像を長時間表示し続ける場合に
生ずる表示器の画面の焼付の防止のため、同じ画像が所
要時間以上続けて表示された場合に、例えば、低輝度の
動画像に切換えるもの、表示画面の輝度を下げるものが
あり、また、無信号の状態が所要時間続いた場合に自動
的に電源をオフするもの等がある。しかし、例えば、受
付等に設置して案内画面を表示し、来客の操作で内部に
連絡できるようにした無人式の来客案内装置のように、
使用者の有無に拘らず何時でも即座に使用可能な状態に
しておかねばならないものでは、案内画面以外の画像に
切換えたのでは案内の役にたたず、画面を暗くたのでは
来客に悪い印象を与えることになり、また、常時案内画
面を表示しておくのであるから電源をオフする等は不可
能なことである。2. Description of the Related Art In order to prevent image sticking on the screen of a display unit that occurs when the same image is continuously displayed for a long time, when the same image is continuously displayed for a required time or longer, for example, a moving image with low brightness is displayed. Some switches, the brightness of the display screen is lowered, and the power is automatically turned off when there is no signal for a required time. However, for example, like an unmanned visitor guidance device that was installed at a reception desk and displayed a guidance screen so that the inside of the visitor could be contacted by the operation of the visitor,
Regardless of whether there is a user or not, it must be ready for immediate use at any time.Switching to an image other than the guide screen does not serve as a guide, and darkening the screen is bad for visitors. It gives an impression, and since the guide screen is always displayed, it is impossible to turn off the power.
【０００３】ところで、上述のように受付等に設置する
装置では、表示器に薄型で画面がフラットなプラズマデ
ィスプレイパネル（ＰＤＰ）を使用し、スマートな外観
に仕上げたものがあるが、ＰＤＰは点灯のためのプラズ
マ放電によって温度が上昇し、性能が劣化するという問
題がある。この温度上昇は高輝度で点灯される画素数が
多い場合に顕著であるため、ＰＤＰの駆動回路部にＡＰ
Ｃ（automatic powercontrol ）回路を設け、ＰＤＰに
供給される電流を計測し、この値が所要値以上にならな
いように輝度／コントラストを制御し、ＰＤＰへの流入
電流を制限している。この電流は映像信号の表示率（全
白の映像信号の輝度レベルの積算値に対する、一画面の
全画素の映像信号の輝度レベルの積算値の比率）に略比
例するので、図２に示すように、表示率が予め設定され
た基準値（ｒ）以上の場合にＡＰＣが動作するようにし
ている。このため、表示率が基準値（ｒ）より低い、Ａ
ＰＣの作動しない領域では映像信号の振幅によってはＰ
ＤＰは最大輝度で点灯する可能性があり、上述の案内画
面のように動きのない画面を連続的に表示する場合に焼
付きを生じる場合がある。By the way, in the above-mentioned apparatus installed at the reception desk, there is a plasma display panel (PDP) which is thin and has a flat screen, and has a smart appearance, but the PDP is turned on. However, there is a problem that the temperature rises due to the plasma discharge and the performance deteriorates. This temperature rise is remarkable when the number of pixels that are turned on with high brightness is large, and therefore the driving circuit of the PDP has an AP
A C (automatic power control) circuit is provided, the current supplied to the PDP is measured, the brightness / contrast is controlled so that this value does not exceed a required value, and the inflow current to the PDP is limited. Since this current is approximately proportional to the display rate of the video signal (the ratio of the integrated value of the brightness levels of the video signals of all the pixels of one screen to the integrated value of the brightness level of the all-white video signal), as shown in FIG. In addition, when the display rate is equal to or higher than the preset reference value (r), the APC operates. Therefore, the display rate is lower than the reference value (r), A
In the area where the PC does not operate, P depends on the amplitude of the video signal.
The DP may be lit at the maximum brightness, and may cause burn-in when continuously displaying a screen that does not move like the guide screen described above.
【０００４】[0004]
【発明が解決しようとする課題】本発明はこのような点
に鑑み、上述の無人式の来客案内装置等のように、ＰＤ
Ｐを使用した画面に、常時案内画面を表示しながら、高
輝度で点灯される画素で焼付きを生じないようにするこ
とにある。SUMMARY OF THE INVENTION In view of such a point, the present invention provides a PD such as the above-mentioned unmanned visitor guide device.
It is to prevent the image sticking from occurring in the pixel which is turned on with high brightness while always displaying the guide screen on the screen using P.
【０００５】[0005]
【課題を解決するための手段】本発明は上述の課題を解
決するため、映像信号を入力する映像信号入力部と、映
像信号入力部よりの映像信号の極性を反転する映像信号
反転部と、前記映像信号入力部よりの映像信号と映像信
号反転部よりの映像信号とを切換えるスイッチと、スイ
ッチの切換えを制御するスイッチ制御部と、前記映像信
号入力部よりの一画面の全画素の映像信号の輝度レベル
の積算値の、全白の映像信号の輝度レベルの積算値に対
する比率を算出する表示率算出部と、表示率の基準値を
記憶する記憶部と、表示率算出部よりのデータを記憶部
より読出した基準値と比較し基準値より低い場合に信号
を出力する判別部と、判別部よりの信号にて起動し所要
時間を計時するタイマーと、前記スイッチ制御部、表示
率算出部、記憶部、判別部およびタイマーを制御する制
御部とからなり、前記タイマーのタイムアップの信号に
て前記スイッチを映像信号反転部側に切換えるようにし
た表示器の保護回路を提供するものである。In order to solve the above problems, the present invention provides a video signal input section for inputting a video signal, and a video signal inverting section for inverting the polarity of the video signal from the video signal input section. A switch for switching a video signal from the video signal input section and a video signal from the video signal inverting section, a switch control section for controlling switch switching, and a video signal of all pixels of one screen from the video signal input section. The display ratio calculation unit that calculates the ratio of the integrated value of the brightness level of the display device to the integrated value of the brightness level of the all-white video signal, the storage unit that stores the reference value of the display ratio, and the data from the display ratio calculation unit. A discriminating unit that compares the reference value read from the storage unit and outputs a signal when the value is lower than the reference value, a timer that starts by a signal from the discriminating unit and measures the required time, the switch control unit, and a display rate calculation unit , Memory Consists of a determination unit and a control unit for controlling the timer, is the switch in the time-up signal of said timer is provided a protection circuit for a display device which is to switch to the video signal inverter side.
【０００６】[0006]
【作用】以上のように構成したので、本発明による表示
器の保護回路においては、入力される映像信号の表示率
が所要率以下で、この状態が所要時間続いた場合、高輝
度で連続点灯される画素があり焼付きを生ずる恐れがあ
るものとし、表示部に印加される映像信号の極性を反転
する。この反転は、映像信号の表示率が前記設定値以上
になった場合に元の極性に戻る。With the above-described structure, in the display protection circuit according to the present invention, when the display rate of the input video signal is less than the required rate and this state continues for the required time, continuous lighting with high brightness is performed. The image signal applied to the display unit is inverted in polarity, assuming that there is a pixel to be burned, which may cause burn-in. This inversion returns to the original polarity when the display rate of the video signal exceeds the set value.
【０００７】[0007]
【実施例】以下、図面に基づいて本発明による表示器の
保護回路の実施例を詳細に説明する。図１は本発明によ
る表示器の保護回路の一実施例の要部ブロック図であ
る。図において、１は映像信号入力部で、例えば、来客
への案内画面等の映像信号を入力する。２は映像信号反
転部で、映像信号入力部１よりの映像信号の極性を反転
して出力する。３はスイッチで、前記映像信号入力部１
よりの映像信号、または映像信号反転部２よりの極性反
転された映像信号を切換える。４は表示部で、表示器に
ＰＤＰ等を使用し、スイッチ３を介して入力される映像
信号に基づいて表示する。５は表示率算出部で、映像信
号入力部１より入力される一画面の全画素の映像信号の
輝度レベルの積算値の、全白の映像信号の輝度レベルの
積算値に対する比率を算出する。６は記憶部で、表示率
の基準値を記憶する。７は判別部で、表示率算出部５よ
りのデータを記憶部６より読出した基準値と比較し、基
準値より低い場合に信号を出力する。８はタイマーで、
判別部７よりの信号にて起動し、所要時間を計時する。
９はスイッチ制御部で、タイマー８よりのタイムアップ
の信号にてスイッチ３を映像信号反転部２（ｂ）側に切
換える。10は制御部で、各部を制御する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a display protection circuit according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of an essential part of an embodiment of a display protection circuit according to the present invention. In the figure, reference numeral 1 is a video signal input unit for inputting a video signal such as a guide screen to a visitor. A video signal inverting unit 2 inverts the polarity of the video signal from the video signal input unit 1 and outputs it. 3 is a switch for the video signal input section 1
Or the video signal whose polarity is inverted by the video signal inverting section 2 is switched. A display unit 4 uses a PDP or the like as a display device, and displays based on a video signal input via the switch 3. Reference numeral 5 denotes a display rate calculation unit that calculates the ratio of the integrated value of the brightness levels of the video signals of all the pixels of one screen input from the video signal input unit 1 to the integrated value of the brightness levels of the all-white video signal. A storage unit 6 stores the reference value of the display rate. A discriminating unit 7 compares the data from the display rate calculating unit 5 with a reference value read from the storage unit 6, and outputs a signal when the data is lower than the reference value. 8 is a timer,
It is activated by a signal from the discriminating unit 7 and measures the required time.
A switch control unit 9 switches the switch 3 to the video signal inverting unit 2 (b) side by a time-up signal from the timer 8. A control unit 10 controls each unit.
【０００８】次に、本発明による表示器の保護回路の動
作を説明する。映像信号入力部１より入力された映像信
号はスイッチ３を介して表示部４に入力し、ＰＤＰ等で
構成された画面に、例えば、図３（イ）に示す「ご案
内」等の反転されていない画像を表示する。映像信号入
力部１よりの映像信号は映像信号反転部２および表示率
算出部５に同時に入力し、映像信号反転部２で極性反転
された映像信号はスイッチ３のｂ接点に加えられるが、
スイッチ３の初期の状態は接点ａ側に切換わっているの
で、表示部４には入力されない。一方、表示率算出部５
で算出された表示率のデータは制御部10を介して判別部
７に入力し、制御部10を介して記憶部６より読出された
表示率の基準値、例えば、10％（図２のｒ）と比較し、
表示率算出部５よりの値がこれより低い場合に信号を出
力する。この信号に基づいて、制御部10を介してタイマ
ー８を起動させ、所要時間、例えば、30分等を計時す
る。30分等の経過にてタイマー８より出力される信号に
基づいて、制御部10を介しスイッチ制御部９により、ス
イッチ３を接点ａ側から接点ｂ側に切換え、映像信号反
転部２で反転された図３（ロ）のような画像を画面に表
示する。これは、映像信号入力部１より入力される映像
信号が「ご案内」の文字の部分のみが点灯される表示率
の低いもので、表示部４のＡＰＣが作動せず、上記「ご
案内」の文字の部分の画素が最大輝度で点灯され、この
状態が長時間続いた場合に文字の部分が焼付く可能性が
あるからである。なお、前記タイマー８は、判別部７よ
りの信号が停止した（表示率が基準値より高くなった）
場合は直ちに計時を停止し、ゼロに戻る。Next, the operation of the display protection circuit according to the present invention will be described. The video signal input from the video signal input unit 1 is input to the display unit 4 via the switch 3 and is displayed on a screen constituted by PDP or the like, for example, "Information" shown in FIG. Not showing the image. The video signal from the video signal input unit 1 is simultaneously input to the video signal inverting unit 2 and the display ratio calculating unit 5, and the video signal whose polarity is inverted by the video signal inverting unit 2 is added to the b contact of the switch 3.
Since the initial state of the switch 3 is switched to the contact a side, it is not input to the display unit 4. On the other hand, the display rate calculation unit 5
The display rate data calculated in step S1 is input to the determination unit 7 via the control unit 10, and the reference value of the display rate read from the storage unit 6 via the control unit 10, for example, 10% (r in FIG. 2). ),
When the value from the display rate calculation unit 5 is lower than this, a signal is output. Based on this signal, the timer 8 is started via the control unit 10 to measure the required time, for example, 30 minutes. Based on the signal output from the timer 8 after the elapse of 30 minutes, the switch 3 is switched from the contact a side to the contact b side by the switch control unit 9 via the control unit 10 and inverted by the video signal reversing unit 2. An image as shown in FIG. 3B is displayed on the screen. This is because the video signal input from the video signal input unit 1 has a low display rate in which only the part of the character "guidance" is turned on, and the APC of the display part 4 does not operate, and the above "guidance" This is because the pixels of the character portion are lit at the maximum brightness, and if this state continues for a long time, the character portion may be burned. The timer 8 stops the signal from the discriminator 7 (the display rate becomes higher than the reference value).
If so, stop timing immediately and return to zero.
【０００９】制御部10は表示率算出部５よりのデータを
監視し、データに変動があった場合、新しいデータを判
別部７に入力し、記憶部６よりのデータと比較し、この
データが表示率の基準値、すなわち10％等より高くなっ
た場合、判別部７よりの信号に基づいてスイッチ制御部
９を介し直ちにスイッチ３を接点ａ側に切換える。な
お、スイッチ制御部９は、制御部10よりの信号をラッチ
回路でラッチし、次の切換え信号が入力されるまでスイ
ッチ３の切換え状態を保持するようにする。The control unit 10 monitors the data from the display ratio calculation unit 5, and when there is a change in the data, inputs new data to the discriminating unit 7 and compares it with the data from the storage unit 6. When it becomes higher than the reference value of the display rate, that is, 10% or the like, the switch 3 is immediately switched to the contact a side via the switch control section 9 based on the signal from the discrimination section 7. The switch control unit 9 latches the signal from the control unit 10 with a latch circuit and holds the switching state of the switch 3 until the next switching signal is input.
【００１０】なお、前記映像信号反転部２では、映像信
号入力部１よりの映像信号の走査期間で信号の極性反転
を行うようにし、この極性反転は、例えば、インバータ
回路により行うようにする。また、前記記憶部６をデー
タの書換えが可能なメモリ、例えば、ＲＡＭ（random a
ccess memory）を用いて構成し、装置の使用状況に応じ
て表示率の基準値を書換えられるようにしてもよい。In the video signal inverting section 2, the polarity of the signal is inverted during the scanning period of the video signal from the video signal input section 1, and the polarity inversion is performed by, for example, an inverter circuit. In addition, the storage unit 6 is a data rewritable memory such as a RAM (random a
ccess memory) so that the reference value of the display rate can be rewritten according to the usage status of the device.
【００１１】[0011]
【発明の効果】以上に説明したように、本発明による表
示器の保護回路によれば、映像信号の表示率が所要率以
下で、この状態が所要時間続いた場合に表示部に印加さ
れる映像信号の極性を反転するので、同一の画素が高輝
度で連続して点灯することがなく、焼付きを防止するこ
とができる。また、この反転によりそれまで点灯してい
なかった画素が点灯するが、映像信号は反転により表示
率の高い状態になるので画素は低輝度で点灯するものと
なり、画素間の経年変化のばらつきを小さくする効果が
ある。As described above, according to the display protection circuit of the present invention, when the display rate of the video signal is less than the required rate and this state continues for the required time, it is applied to the display section. Since the polarity of the video signal is inverted, the same pixel is not continuously illuminated with high brightness, and it is possible to prevent burn-in. Further, due to this inversion, the pixels that have not been turned on are turned on, but since the video signal has a high display rate due to the inversion, the pixels are turned on with low brightness, and the variation in aging between pixels is reduced. Has the effect of
【図１】本発明による表示器の保護回路の一実施例の要
部ブロック図である。FIG. 1 is a block diagram of a main part of an embodiment of a protection circuit for a display according to the present invention.
【図２】本発明による表示器の保護回路のＡＰＣ動作の
説明図である。FIG. 2 is an explanatory diagram of an APC operation of a display protection circuit according to the present invention.
【図３】本発明による表示器の保護回路の表示反転を説
明するための図である。FIG. 3 is a diagram for explaining display inversion of a protection circuit for a display according to the present invention.
１ 映像信号入力部 ２ 映像信号反転部 ３ スイッチ ４ 表示部 ５ 表示率算出部 ６ 記憶部 ７ 判別部 ８ タイマー ９ スイッチ制御部 10 制御部 1 Video signal input section 2 Video signal inversion section 3 switches 4 Display 5 Display rate calculator 6 memory 7 Discriminator 8 timer 9 Switch control unit 10 Control unit
Claims (8)
映像信号入力部よりの映像信号の極性を反転する映像信
号反転部と、前記映像信号入力部よりの映像信号と映像
信号反転部よりの映像信号とを切換えるスイッチと、ス
イッチの切換えを制御するスイッチ制御部と、前記映像
信号入力部よりの一画面の全画素の映像信号の輝度レベ
ルの積算値の、全白の映像信号の輝度レベルの積算値に
対する比率を算出する表示率算出部と、表示率の基準値
を記憶する記憶部と、表示率算出部よりのデータを記憶
部より読出した基準値と比較し基準値より低い場合に信
号を出力する判別部と、判別部よりの信号にて起動し所
要時間を計時するタイマーと、前記スイッチ制御部、表
示率算出部、記憶部、判別部およびタイマーを制御する
制御部とからなり、前記タイマーのタイムアップの信号
にて前記スイッチを映像信号反転部側に切換えるように
した表示器の保護回路。1. A video signal input section for inputting a video signal,
A video signal inverting unit that inverts the polarity of the video signal from the video signal input unit, a switch that switches between the video signal from the video signal input unit and the video signal from the video signal inverting unit, and a switch that controls the switching of the switches. A control unit; a display ratio calculation unit for calculating a ratio of an integrated value of brightness levels of video signals of all pixels of one screen from the video signal input unit to an integrated value of brightness levels of an all-white video signal; With a storage unit that stores the reference value of the rate, a determination unit that compares the data from the display rate calculation unit with the reference value read from the storage unit, and outputs a signal when the value is lower than the reference value, the signal from the determination unit A timer that starts up and measures the required time, and a switch control unit, a display ratio calculation unit, a storage unit, a determination unit, and a control unit that controls the timer. Protection circuit for a display device which is to switch to the video signal inverter side.
のデータが記憶部より読出した基準値より高い場合に前
記スイッチ制御部に信号を出力し、前記スイッチを映像
信号入力部側に切換えるようにした請求項１記載の表示
器の保護回路。2. The determination unit outputs a signal to the switch control unit when the data from the display ratio calculation unit is higher than a reference value read from the storage unit, and the switch is turned to the video signal input unit side. The display protection circuit according to claim 1, wherein the protection circuit is switched.
期間で信号の極性反転を行うものでなる請求項１または
請求項２記載の表示器の保護回路。3. The display protection circuit according to claim 1, wherein the video signal inversion unit inverts the polarity of the signal during the scanning period of the video signal.
用いて構成し、映像信号の極性反転を行うものでなる請
求項１、請求項２または請求項３記載の表示器の保護回
路。4. The display protection circuit according to claim 1, wherein the video signal inverting unit is configured by using an inverter circuit, and performs polarity reversal of the video signal.
略１０％に設定してなる請求項１、請求項２、請求項３
または請求項４記載の表示器の保護回路。5. The display value reference value stored in the storage unit is set to about 10%, and the display ratio is set to about 10%.
Alternatively, the display protection circuit according to claim 4.
モリを用いて構成し、表示率の基準値を書換えられるよ
うにした請求項１、請求項２、請求項３または請求項４
記載の表示器の保護回路。6. The memory according to claim 1, claim 2, claim 3, or claim 4, wherein the storage unit is composed of a memory capable of rewriting data, and the reference value of the display rate is rewritable.
Protective circuit for the indicated display.
定してなる請求項１、請求項２、請求項３、請求項４、
請求項５または請求項６記載の表示器の保護回路。7. The measuring time of the timer is set to about 30 minutes, claim 2, claim 3, claim 4,
The protection circuit for the display according to claim 5 or 6.
て構成し、制御部を介して入力されるスイッチ切換えの
信号を次の信号の入力までラッチし、スイッチの切換え
られた状態を保持するようにした請求項１、請求項２、
請求項３、請求項４、請求項５、請求項６または請求項
７記載の表示器の保護回路。8. The switch control unit is configured by using a latch circuit, and a switch switching signal input via the control unit is latched until the input of the next signal so that the switched state of the switch is held. Claim 1, claim 2,
The protection circuit for a display according to claim 3, claim 4, claim 5, claim 6, or claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02005295A JP3389957B2 (en) | 1995-02-08 | 1995-02-08 | Display protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02005295A JP3389957B2 (en) | 1995-02-08 | 1995-02-08 | Display protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08211858A JPH08211858A (en) | 1996-08-20 |
| JP3389957B2 true JP3389957B2 (en) | 2003-03-24 |
Family
ID=12016306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02005295A Expired - Fee Related JP3389957B2 (en) | 1995-02-08 | 1995-02-08 | Display protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3389957B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3520630B2 (en) | 1995-10-20 | 2004-04-19 | 株式会社富士通ゼネラル | Display protection circuit |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3266191B2 (en) | 1998-12-25 | 2002-03-18 | 日本電気株式会社 | Plasma display and its image display method |
| KR100301512B1 (en) * | 1998-12-31 | 2001-09-06 | 구자홍 | Screen protection method in a video display |
| JP3279545B2 (en) * | 1999-07-01 | 2002-04-30 | 日本電気株式会社 | Display device with burn-in prevention function and burn-in prevention method |
| JP2001067040A (en) * | 1999-08-30 | 2001-03-16 | Sony Corp | Display device |
| JP2001117531A (en) | 1999-10-18 | 2001-04-27 | Nec Corp | Display device with function of uniformizing pixel emission frequency |
| JP2001125536A (en) * | 1999-10-29 | 2001-05-11 | Matsushita Electric Ind Co Ltd | Driving method for plasma display panel |
| EP1271459A1 (en) * | 2001-06-27 | 2003-01-02 | Deutsche Thomson-Brandt Gmbh | Method and device for compensating burning effects on display panel |
| CN104680979B (en) * | 2015-03-23 | 2019-03-12 | 京东方科技集团股份有限公司 | The method of OLED display and the image retention for correcting OLED display |
| CN111526344B (en) * | 2019-02-01 | 2021-12-14 | 中国电影器材有限责任公司 | Digital film projection method and system |
| CN111526345B (en) * | 2019-02-01 | 2021-12-14 | 中国电影器材有限责任公司 | Digital film projection method and system |
| CN111526343B (en) * | 2019-02-01 | 2022-03-01 | 中国电影器材有限责任公司 | Digital film projection method and system |
-
1995
- 1995-02-08 JP JP02005295A patent/JP3389957B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3520630B2 (en) | 1995-10-20 | 2004-04-19 | 株式会社富士通ゼネラル | Display protection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08211858A (en) | 1996-08-20 |
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