JP2970597B2 - TV monitor screen burn-in prevention system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for monitoring using a TV image signal or a system for transmitting a test TV pattern signal, which is used when a receiving TV monitor receives a still image for a long time. The present invention relates to a system for preventing burn-in of a TV monitor screen that occurs.

[0002]

2. Description of the Related Art Conventionally, a CRT has been used as this type of TV monitor.
(Cathode ray tube), this CRT utilizes fluorescence obtained by projecting an electron beam onto a fluorescent paint applied to a display screen. Therefore, when the same still image is displayed on the TV monitor for a long time, the electron beam is continuously projected in the same state on the same portion of the phosphor screen.
Only the same portion of the phosphor screen is likely to be deteriorated, and so-called burn-in may occur even when no image is displayed, in which pattern unevenness occurs according to the image pattern up to that time. In particular, in a system for monitoring a facility or the like in a remote place using a TV video signal, the same video is monitored by a TV monitor for a long time, so that this kind of burn-in tends to occur. When such burn-in occurs, the life of the TV monitor is shortened.

[0003]

For this reason, in a conventional system of this kind, a plurality of TVs are provided on the receiving side.
A monitor is prepared and each TV monitor is switched periodically. However, this requires a plurality of TV monitors, which is not economically preferable, and requires a circuit for switching, and the equipment is complicated. Be transformed into It is also conceivable to periodically turn off the TV monitor, but the operation for periodically turning off the TV monitor is troublesome. Further, simply turning off the TV monitor is not enough to prevent the above-mentioned burn-in.

[0004] An object of the present invention is to automatically switch a video on a TV monitor when a still video continues, thereby enabling a TV to be displayed.
It is an object of the present invention to provide a system capable of preventing burn-in on a monitor screen.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a system for transmitting a TV video signal from a transmitting unit to a receiving unit, and displaying the previous TV video signal on a TV monitor in the receiving unit. Means for superimposing a video identification signal on the TV video signal when transmitting a video, wherein the receiving unit detects the video identification signal from the received TV video signal at a preset timing. There is provided a means for displaying a preset pattern on the TV monitor for a set time. For example,
The transmission unit includes a video identification signal generation unit that generates the video identification signal based on a control signal input when a still video is transmitted, and an inserter that superimposes the video identification signal on the TV video signal to be transmitted. And Also, the receiving unit may be configured to reproduce the video identification signal from the received TV video signal, and for a time set at a timing set based on the reproduced video identification signal and input set time information. A timing generator for outputting a switching control signal, a pattern signal generator for outputting a video signal of a preset pattern, and the TV video signal when the switching control signal is input from the timing generator. A signal switch for switching to a signal and outputting the signal to the TV monitor.

[0006] When transmitting a still video TV video signal on the transmission side, the video identification signal is superimposed, and when the reception side detects this video identification signal, it outputs a switching control signal at a set timing and time. Then, the received TV video signal is switched to a video of a preset pattern signal. By displaying this pattern signal on the TV monitor, burn-in on the TV monitor screen due to the continuation of the still image is prevented.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment in which the present invention is applied to a system for remote monitoring. In a transmitting unit 1, a plurality of monitoring targets are respectively imaged by a plurality of TV cameras 11, and in accordance with an output of a control circuit 12. Leveraged T
While switching the V-video signal sequentially, or a specific TV
The video signal is modulated while continuing for a long time, and transmitted as radio waves. The receiving section 2 receives the TV video signal, demodulates it, and displays it as an image on the TV monitor 21. As a result, the TV monitor 21 in the receiving unit 2 can monitor a monitoring target in a remote place.

FIG. 2 is a block diagram of the transmission section 1. A TV video signal to be monitored captured by a TV camera is input to an inserter 102 after a DC component is reproduced by a clamper 101. On the other hand, when a still image is to be transmitted for a relatively long time among the plurality of TV video signals, the control circuit 12 that manages the transmission transmits a control signal for turning on the video identification signal. Is input to the data processing unit 103. The data processing unit 103 sends a trigger signal to the video identification signal generation unit 104 in response to the input of the control signal, and in response to the trigger signal, the video identification signal generation unit 104 sends the video identification signal to the inserter 102. Output. The inserter 102
Superimposes this video identification signal on a vertical synchronizing signal section of the TV video signal, outputs the composite TV signal, and sends the composite TV signal as a TV transmission signal from the TV transmission unit 105.

FIG. 3 is a block diagram of the receiving section 2. As shown in FIG. TV receiving unit 20 receiving the TV transmission signal
In step 1, a composite TV signal is reproduced from the received TV reception signal, and the composite TV signal is branched into two. One part is input to the signal switch 202 and the other part is input to the synchronization signal separation unit 203. In the synchronization signal separating section 203, a vertical synchronization signal is extracted and applied to a video identification signal reproducing section 204 to reproduce the video identification signal. When the video identification signal is input, the timing generation unit 205 sends a switching control signal to the signal switch 202 at a duration set in advance by the operator and at a set repetition timing. The timing generation unit 205 can forcibly stop the transmission of the switching control signal by an external control signal input from the outside even while transmitting the switching control signal.

When the switching control signal from the timing generator 205 is input to the signal switcher 202, a pattern signal set in advance from the composite TV signal from the TV receiver 201 is set. Is switched to the video output signal of the pattern signal generator 206 that outputs the video signal, and the video output signal of the pattern signal generator 206 is input to the TV monitor 21. The image output signal of the pattern signal generation unit 206 has a low average luminance level and is selected to have a moving pattern so that the CRT screen of the TV monitor 21 is not burned.

Therefore, when transmitting a fixed still image for a long time in transmitting section 1, a video identification signal is generated based on the control signal, and this is superimposed on the TV transmission signal. For this reason, the receiving unit 2 receiving this
Then, when this video identification signal is received, a switching control signal is transmitted to the signal switch 202 at a set repetition timing for a set time, and during this set time, the pattern signal generation unit 206 The video output signal of the TV monitor 21 causes the TV monitor 21 to display a video. For this reason,
If you want to display a constant still image for a long time,
At the set repetition timing and at the set time, the display such as a moving image will be automatically executed,
Burn-in on the TV monitor 21 due to a still image is prevented. This eliminates the need for the operator to manually operate the TV monitor to prevent image sticking, and the effect of preventing image sticking can be obtained reliably and easily.

[0012] Further, the switching of the video on the TV monitor is performed only when a fixed still image is transmitted for a long time on the transmitting side. No video switching is performed on the TV monitor. For this reason, the work of preventing burn-in by unnecessary operation of the TV monitor on the receiving side becomes unnecessary. It should be noted that, at the request of the receiving side, it is possible to forcibly return to the composite TV signal by inputting an external control signal to the timing generation unit. Is possible.

Here, in the above-described embodiment, an example in which the video identification signal is superimposed on the vertical synchronizing signal section of the TV video signal has been described. Good.

[0014]

As described above, according to the present invention, the TV video signal is transmitted from the transmitting unit to the receiving unit, and the receiving unit transmits the TV video signal.
In a system for displaying a V video signal on a TV monitor,
The transmitting unit includes means for superimposing a video identification signal on the TV video signal when transmitting a fixed still video, and the receiving unit detects the video identification signal from the received TV video signal, By providing a means for displaying a preset pattern image on the TV monitor for a preset time at a preset timing, it is possible to avoid displaying a static image on the TV monitor for a long time, Seizure can be prevented. Also, at this time, the transmitting side transmits the video identification signal based on the still video, and the receiving side automatically performs the prevention operation without performing any operation when detecting the video identification signal, so that it is reliable and easy. It is possible to prevent image sticking to the image.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a remote monitoring system to which the system of the present invention is applied.

FIG. 2 is a block diagram of a transmission unit in the system of FIG.

FIG. 3 is a block diagram of a receiving unit in the system of FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transmission unit 2 reception unit 11 TV camera 12 control circuit 21 TV monitor 101 clamper 102 inserter 103 data processing unit 104 video identification signal generation unit 105 TV transmission unit 201 TV reception unit 202 signal switch 203 synchronization signal separation unit 204 video identification signal Reproduction unit 205 Timing generation unit 206 Pattern signal generation unit

Claims (5)

(57) [Claims] 1. A system in which a TV video signal is transmitted from a transmission unit to a reception unit, and the reception unit displays a previous TV video signal on a TV monitor. Means for superimposing a video identification signal on a video signal;
When the video identification signal is detected from a video signal, a means for displaying a preset pattern video on the TV monitor for a preset time at a preset timing is provided. system. 2. The image processing apparatus according to claim 1, wherein the transmitting unit is configured to generate the video identification signal based on a control signal input when a still video is transmitted, and the video identification signal is transmitted to the TV video signal. And an inserter for superimposing a signal,
The receiving unit reproduces the video identification signal from the received TV video signal, and performs switching control for a time set at a timing set based on the reproduced video identification signal and input set time information. A timing generator for outputting a signal, a pattern signal generator for outputting a video signal of a preset pattern, and the TV video signal being converted to the pattern signal when a switching control signal is input from the timing generator. The TV monitor screen burn-in prevention system according to claim 1, further comprising: a signal switch that switches the output to the TV monitor. 3. The TV monitor screen burn-in prevention system according to claim 2, wherein the timing generator stops outputting the switching control signal in response to a control signal input from the outside. 4. The TV monitor screen burn-in prevention system according to claim 1, wherein the pattern image has a low luminance and is a moving image. 5. The system according to claim 1, wherein the TV monitor comprises a cathode ray tube.