JPS6358495A - Display device control system - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] An image display unit that detects the state of a video signal applied to a display device and suffers from fluctuations and deterioration over time when the video signal is no signal for a certain period of time.

This is to control display stop without using a special external signal.

[Industrial application field]

The present invention relates to a display device control method that detects that a video signal for displaying nine images is in a no-signal state for a certain period of time and makes it possible to stop displaying two images.

[Conventional technology]

Conventionally, in continuous operation of display devices.

As a method for preventing a decrease in brightness and contrast due to variations in the display characteristics of the image display section, there has been a method of stopping the display of the image display section when unnecessary.

One way to do this is to manually stop the image display on the display device, but there is a way to do this automatically, as shown in the conventional display device control method block diagram in Figure 4. , display device 1
A power supply control section 44 for stopping the one-image display section 41 by operating a power supply 43 is provided within the display device 1.
A display device method existed on the side of the computer 45 that provided video signals to the computer.

As described above, conventionally, when stopping image display on a display device, in addition to a special control circuit within the display device, a control circuit outside the device and a signal line for sending control signals have been required.

[Problem that the invention seeks to solve]

According to the above-mentioned conventional technology system, a problem arises in that a signal for controlling the display of one image must be specially given from the outside in a device that automatically controls the image display of the display device.

The present invention aims to solve the above-mentioned problems and provides a display device control method that does not require a special signal from the outside to control the display of one image when controlling the image display of the display array device.

[Means for solving problems]

FIG. 1 shows a block diagram of the principle of the present invention. In FIG. 1, the video signal detection unit 11 monitors the state of the video signal by inputting the video signal given to the display device 1 for displaying an image, and monitors the state of the video signal if the video signal continues for a certain period of time. This is a circuit that detects when the display is in a non-display state.

The display control unit 12 detects the video signal in the non-display state for a certain period of time because the video signal detection unit 11 detects the video signal in the non-display state.

This is a circuit that controls the image display section 13 to stop displaying an image.

[Effect]

According to the invention, in a display device 1.

Video signal detection unit 1 that detects the state of a given video signal
By providing a display control unit 12 that controls the display of images 1 and 2, an external control device or the like.

Image display on a display device can be controlled based on the state of a video signal without applying an external control signal.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to FIG.

FIG. 2 is a block diagram showing one embodiment of the present invention.

FIG. 3 shows the operating state of the video signal detection section 11 shown in FIG. 2 using a time chart.

It should be noted that the eye in FIG. 2 corresponds to the same numbers in the principle block diagram shown in FIG. 1. be.

In this embodiment, a display control section 12. which controls image display on the display device 1. The video signal detection section 11 is a functional block necessary to implement the present invention.

In FIG. 2, one display control section 12 includes a vertical drive section 21. Horizontal drive section 22° video amplifier circuit 23. Flyback transformer 24° high voltage control section 25
．． The video signal detection unit 11 controls the power applied to the CRT 26, and when the applied video signal shows a non-display state for a certain period of time, it detects this and outputs a signal to the 2-display control unit 12. It is.

The video signal detection section 11 in this embodiment is as follows.

Using a retriggerable monostable multivibrator.

A video signal is input as a trigger input, and its output is given to the display control section 12. Figure 3 is.

A time chart is shown when a monostable multivibrator is used as the video signal detection section 11. As shown in Figure 3, when a trigger input is given to a monostable multivibrator, the output becomes "1". By selecting the time constant of the monostable multivibrator, it is possible to The output is held at '1' while display data is input. Then, if no display data is given from the video signal for a long time according to the time constant set in the monostable multivibrator, the trigger power input to the monostable multivibrator is also given, and its output is teeth"
It becomes "4°" and "1" depending on the state of the video signal.
It becomes possible to identify these two states.

The output from this video signal detection section 11 is displayed in one display control section 12.
When the video signal has display data and the output of the video signal detection section 11 is "L", the transistors Ql and Q2 of the two display control section 12 are turned off (
OFF), ON (ON), and power is supplied from the power supply section 10 to the image display section 13 through Q2.
3 works. Also, if the video signal becomes non-displayed,
The output of the video signal detection section 11 becomes "Z", and the transistors Ql and Q2 of the 2nd display control section 12 turn on (ON) and off (OFF), respectively, and the power to the 9th image display section 13 is cut off, and the 9th image is displayed. Stop display.

In the present invention, by providing a display control unit 12 for controlling and stopping the image display of the display device 1 and a video signal, the video signal indicates a non-display state and that state continues for a certain period of time. By configuring the video signal detection section 11 that detects the image as shown in FIG. 2, it is possible to control the image display of the display device using only the video signal.

In this case, the dual display control unit 12 uniformly controls the power applied to the image display unit 13 as in one embodiment, and also cuts off the power to the heater of the CRT 26 that directly displays the dual images, or
Many methods are possible, such as stopping the function of either or all of the horizontal drive section 22 or the vertical drive section 23.

As described above, the two aspects of the present invention are characterized in that they are based on whether or not there is data to be displayed as an image on the display device, and that the display is stopped only when a signal that causes no display is input in the video signal.

〔Effect of the invention〕

As described above in detail, the display device control method of the present invention is based on the image display unit 1 in the display device.
3, and a video signal detection section 11 that detects the state of the video signal, and the display control section 12 is controlled by the video signal detection section 11.

5 depending on the state of the video signal applied to the display device.
This stops the image display. Therefore, there is no need for special signals or external devices to control the 2-image display section.
Stopping the image display is possible by simply turning the video signal into a non-display state, which has the effect of reducing the need for external devices and special signal line equipment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of the principle of a display device control method according to the present invention. FIG. 2 shows an embodiment of the present invention. FIG. 3 is an operation time chart using a monostable multivibrator in the video signal section of the present invention. FIG. 4 is a block diagram of a conventional display device performance control system. In the drawing. 12 is a 2 display control unit. 13 is a two-image display section. 21 is 9. Vertical drive. 22 is a horizontal drive unit. 23 is a video amplifier circuit. 24 is a flyback transformer. 25 is a high pressure control section. 26 each indicates a CRT. (There is no change in the contents of the drawings.)
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Claims (2)

[Claims] (1) In a display device equipped with an image display section (13) having characteristic fluctuations over time, a video signal detection section that detects the state of a video signal for displaying an image and determines that no video signal is input for a certain period of time. (11); and a display control unit (1) that is controlled by the video signal detection unit (11) and stops the image display of the image display unit (13).
2), a display device control method characterized in that image display is stopped when no video signal is input for a certain period of time. (2) The display according to claim 1, wherein the video signal detection section (11) is a monostable multivibrator circuit, and detects the presence or absence of data for displaying an image from the video signal. Device control method.