JPH0569788U - Power supply device for display device - Google Patents

Abstract

(57) [Summary] [Purpose] To automatically supply power to the display device. [Structure] The presence / absence of a synchronization signal SC output from the information processing device 1 to the display device 2 is determined by the determination circuit 4. Based on the discrimination result of the discrimination circuit 4, the energization / de-energization of the relay circuit 5 is controlled, and the display power supply to the display device 2 is controlled.
By this control of power supply, power to the display device 2 is automatically supplied or cut off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power supply device for a display device that supplies power to a display device such as a CRT display device used in an information processing device such as a computer.

[0002]

[Prior Art]

 In information processing devices such as computers, CRT display devices (hereinafter referred to as CRT devices) are often used for displaying data and commands.

As a mode of supplying power to such a CRT device, (1) a manual power switch is provided and power is supplied when the power switch is turned on. (2) The power source of the information processing device and the power source of the CRT device are shared. (3) Control the supply of power to the CRT device using a special control signal. Therefore, the information processing apparatus is appropriately adopted according to the system configuration of the information processing apparatus.

[0004]

[Problems to be solved by the device]

 However, the above-mentioned power supply form has the following problems. That is, (1) When a manual power switch is provided, it is easy to forget to turn off the power switch, and the power may remain on for a long time even when not in use. (2) When shared with the power supply of the information processing device main body, noise may occur in the power supply line due to the interference wave radiated from the CRT device, and the information processing device main body may malfunction such as incorrect calculation. (3) When using a special control signal, the information processing device requires an output terminal for a special control signal. And so on.

The present invention has been made in view of the above circumstances, and is directed to a display device that automatically supplies power to a display device by determining a sync signal output from the information processing device to the display device. An object is to provide a power supply device.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a power supply device of a display device for supplying power to a display device displaying information output from an information processing device, wherein the information processing device outputs the information to the display device. It is characterized by further comprising a discriminating means for discriminating the synchronizing signal to be generated and a control means for controlling the supply of the display electric power to the display device based on the discrimination result in the discriminating means.

[0007]

[Action]

 Since the present invention is configured as described above, the control means controls the power supply to the display device based on the determination result of the presence or absence of the synchronization signal in the determination means, and the display power to the display device is controlled. The supply is automatically performed according to the usage status of the information processing device, and it is possible to prevent forgetting to turn off the power switch or malfunction of the information processing device main body.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a power supply device for a display device according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an information processing device such as a computer. The information processed by the information processing device 1 is converted into a video signal V and output to a display device 2 together with a synchronizing signal SC for display. .. The display device 2 is composed of a CRT device or the like, and displays various information processed by the information processing device 1 on its display screen according to the video signal V and the synchronizing signal SC output from the information processing device 1.

Further, the display device 2 has a built-in power supply circuit (not shown) for generating a voltage required for display, and the power for driving this power supply circuit is supplied via the power supply device 3. The power supply device 3 includes a discrimination circuit 4 for discriminating the presence or absence of the synchronization signal SC output from the information processing device 1, a relay circuit 5 energized by a control signal based on the discrimination result of the discrimination circuit 4, And the power switch 6, and the AC power from the commercial power source 7 is supplied to the display device 2 via the power switch 6 and the discrimination circuit 4 and the relay circuit 5, respectively.

The determination circuit 4 is composed of, for example, a monostable circuit capable of maintaining a metastable state during continuous synchronization signals SC. When the synchronization signal SC is detected in the metastable state, the relay circuit 5 determines that the synchronization signal SC is present. It outputs the determined control signal, and outputs the control signal that determines that there is no sync signal SC when the sync signal SC is not detected in a stable state. The discriminating circuit 4 has a power supply circuit (not shown) for converting the AC voltage supplied from the commercial power supply 7 into a DC voltage having a required voltage.

Next, the operation of the embodiment of the present invention having the above structure will be described.

To operate the information processing device 1, a power switch (not shown) of the information processing device 1 is turned on and a power switch 6 for supplying power to the display device 2 is turned on. In this state, the information processing device 1 outputs the video signal V and the synchronizing signal SC to the display device 2, and the discrimination circuit 4 is in the operating state with the AC power supplied from the commercial power source 7. It is determined that the sync signal SC output to the display device 2 is present. When the presence of the synchronization signal SC is determined, a control signal with the synchronization signal SC is output from the determination circuit 4 to the relay circuit 5, and the relay circuit 5 is energized.

By energizing the relay circuit 5, AC power is supplied from the commercial power supply 7 to the display device 2 through the relay circuit 5, and the display device 2 outputs the video signal V output from the information processing device 1 and Information of each type processed by the information processing device 1 is displayed on the display screen according to the synchronization signal SC.

By the way, when the power switch of the information processing apparatus 1 is turned off in order to change the information processing apparatus 1 from the operating state to the non-operating state, the information processing apparatus 1 has been outputting to the display apparatus 2 so far. The synchronized signal SC is no longer output. When the sync signal SC is no longer output, the determination circuit 4 determines that there is no sync signal SC, and outputs a control signal without the sync signal SC to the relay circuit 5. This control signal deactivates the relay circuit 5, the AC power supplied from the commercial power source 7 to the display device 2 via the power switch 6 is no longer supplied, and the display device 2 stops displaying information.

As described above, the presence / absence of the synchronization signal SC output from the information processing device 1 to the display device 2 is determined by the determination circuit 4, and the AC power from the commercial power source 7 to the display device 2 is determined based on the determination result. By controlling the supply, the display power supplied to the display circuit 2 is automatically supplied or cut off by the power supply device 3.

Although the CRT display device is applied as the display device in the above-described embodiment, the present invention is not limited to this, and the same operational effect can be obtained even if another display device such as a plasma display panel is applied. it can.

In the above embodiment, the AC power is supplied from the commercial power supply 7 to the discrimination circuit 4 and the display device 2 via the power switch 6, but the power switch 6 is removed and the commercial power supply 7 is removed. AC power may be supplied directly.

Further, the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0021]

[Effect of the device]

 As described above in detail, according to the power supply device for a display device of the present invention, the control means controls the supply of the display power to the display device based on the determination result of the presence or absence of the synchronization signal in the determination means. By doing so, the power supply to the display device can be automatically performed according to the usage state of the information processing device, and it is possible to prevent forgetting to turn off the power switch or malfunction of the information processing device main body.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a power supply device of a display device according to an embodiment of the present invention.

[Explanation of symbols]

 1 ... Information processing device 2 ... Display device 3 ... Power supply device 4 ... Discrimination circuit (discrimination means) 5 ... Relay circuit (control means)

Claims (1)

[Scope of utility model registration request] 1. A power supply device of a display device for supplying power to a display device for displaying information output from an information processing device, wherein a determination means for determining a synchronization signal output from the information processing device to the display device. And a control means for controlling the supply of display power to the display device based on the determination result of the determination means.