JPH06161405A - Display controller - Google Patents

Abstract

PURPOSE:To remotely power ON and OFF a display device through a general CRT interface(I/F) cable. CONSTITUTION:In a CRT unit 20, a vertical synchronizing(V-SYNC) signal detecting circuit 25 detects a signal V-SYNC supplied from a word processor main body 10 through the CRT I/F cable 30 (the circuit 25 can operate by a power circuit 26 at all times) and then turns ON a relay 24 for an alternating current supplied to the power circuit 23 when the signal V-SYNC succeeds at a certain period, thereby turning on the power circuit 23 for the whole CRT unit 20. When the power source of the word processor main body 10 is turned OFF, the signal V-SYNC signal passing through the CRT I/F cable 30 is ceased, and consequently the V-SYNC signal detecting circuit 25 turns OFF the relay 24 to turn OFF the main power source of the CRT unit 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display control device for remotely turning on / off a power supply of a display device such as a CRT unit which displays data by a signal from a data output device such as a word processor or an office computer. .

[0002]

2. Description of the Related Art Conventionally, a CR has been used as a display device for data output devices such as word processors and office computers.
T unit is used. Conventionally, the following three methods are known as methods for turning on / off the power supply of this CRT unit.

That is, the first is a method in which the power switch on the CRT unit side is manually turned on / off by the user in accordance with the turning on / off of the data output device body.

Second, as shown in FIG. 2, AC is received from a switched AC outlet 101 of the data output device main body 100, and is automatically turned on / off according to turning on / off of the main body 100. Is.

Thirdly, the data output device body and C
CRT interface (I /
F) A method of adding a power on / off signal of the CRT unit to the cable and controlling the presence / absence of the signal.

[0006]

However, in the above first method, when the power of the data output device main body is turned off, C
There is a risk of forgetting to turn off the power of the RT unit and leaving the CRT unit energized for a long time.

The second method, which is a generally widely used method, includes a data output device main body 100,
When trying to increase the distance from the CRT unit 102,
Along with the signal cable 103, a long AC cable 104 must be prepared.

In the third method, the power is turned on /
There is a problem that a general I / F cable cannot be used because a signal line for turning off has to be specially prepared in the CRT I / F cable.

An object of the present invention is to eliminate the need to take the AC input of the CRT unit from the switched AC outlet of the main body of the data output device and to use the signal used for the signal line in the ordinary CRT I / F cable. The remote power of the display device can be turned on / off.

[0010]

The means of the present invention are as follows. The detecting means detects the presence / absence of a basic synchronizing signal for display which is constantly supplied from the data output device body when the data output device body is powered on. The control means controls ON / OFF of the power supply of the display device according to the detection result of the detection means.

[0011]

The operation of the means of the present invention is as follows. The control means is a normal CR when the power of the data output device main body is turned on.
Depending on the detection result of the detection means for detecting the presence or absence of the basic synchronization signal for display, such as the vertical synchronization signal, which is constantly supplied from the data output device main body through the T I / F cable,
When the basic synchronization signal is present, the power of the display device is turned on, and when the basic synchronization signal is not present, the power of the display device is turned off.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a diagram showing the configuration thereof. In the figure, reference numeral 10 is a word processor main body as a data output device, 20 is a CRT unit as a display device, and 30 is a CRT for connecting the word processor main body 10 and the CRT unit 20. It is an I / F cable.

The word processor body 10 is powered on / off by a user operating a body switch (SW) 11. When the power of the word processor 10 is turned on, after various initializations, a signal for display (vertical synchronization (V-SYNC) signal, horizontal synchronization ( H-SY
NC) signal, display data (VIDEO) signal).

The CRT unit 20 includes a CRT 21 and a CR.
T control circuit 22, power supply circuit 23, relay 24, vertical synchronization (V-SYNC) signal detection circuit 25, permanent power supply circuit 26
have. The CRT control circuit 22 displays data on the CRT 21 based on the signal supplied from the word processor main body 10 via the CRT I / F cable 30. The power supply circuit 23 receives AC from an AC outlet (not shown) by the AC cable 27, and the CRT control circuit 22
A predetermined DC is supplied to the main circuit such as. Relay 24
Shuts off the supply of AC to the power supply circuit 23. V-SY
The NC detection circuit 25 detects the V-SYNC signal from the signal supplied via the CRT I / F cable 30, and turns on / off the relay 24 according to the result. The standby power supply circuit 26 always operates the V-SYNC signal detection circuit 25.

Next, the operation in such a configuration will be described.

From the word processor main body 10 to CRT I
Among the signals supplied to the CRT unit 20 via the / F cable 30, the V-SYNC signal and the H-SYNC signal are indispensable signals indicating the display position, and while the CRT unit 20 is operating. , Never ceases.

Therefore, in this embodiment, the V-SYNC signal detecting circuit 25 detects the V-SYNC signal (this circuit 25 is always operable by the standby power supply circuit 26), and the V-SYNC signal is detected at a constant cycle. When the -SYNC signal continues, the V-SYNC signal detection circuit 25 turns on the AC relay 24 supplied to the power supply circuit 23. As a result, power is supplied from the power supply circuit 23 to the main circuit (CRT control circuit 22), and the power of the entire CRT unit 20 can be turned on.

On the contrary, the main body S of the word processor main body 10
When the power of the word processor main body 10 is turned off by the operation of turning off W11, the V-SYNC signal via the CRT I / F cable 30 is stopped, so the relay 24 is turned off and the main power supply of the CRT unit 20 is turned off. Will be done.

As described above, the CRT I / F cable 3
The state in which the basic synchronization signal (V-SYNC signal) in 0 is continuously supplied from the word processor main body 10 to the CRT unit 20 side is the word processor main body 10
It is recognized that the power of the word processor 10 is turned on, and that the state in which the basic synchronization signal is not supplied for a certain time or more is recognized that the power of the word processor main body 10 is not turned on. Since the power source is controlled, it is possible to remotely turn on / off the power of the CRT unit 20 by using the signal used for the signal line in the general CRT I / F cable 30. .

In the above embodiment, the V-SYNC signal is detected. However, even if the H-SYNC signal is detected, the remote power can be turned on / off in the same manner. .

[0022]

According to the present invention, the AC of the CRT unit is
It is not necessary to take the input from the switched AC outlet of the data output device body, and the power of the display device can be turned on / off remotely using the signal used for the signal line in the normal CRT I / F cable. Like

That is, the present invention is a general CRT I / F.
Remote power on / off can be realized by using the basic sync signal, which is an indispensable signal for the cable.
There is an advantage that the C input does not have to be taken from the switched AC of the data output device body, can be taken from any AC outlet, and a special I / F signal need not be prepared.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a display control device according to an embodiment of the present invention.

[Fig. 2] Remote power on / off of a conventional CRT unit
It is a figure for explaining an off method.

[Explanation of symbols]

10 ... Word processor main body, 11 ... Main body switch (S
W), 20 ... CRT unit, 21 ... CRT, 22 ... C
RT control circuit, 23 ... power supply circuit, 24 ... relay, 25 ...
Vertical synchronization (V-SYNC) signal detection circuit, 26 ... Standby power supply circuit, 27 ... AC cable, 30 ... CRT interface (I / F) cable.

Claims (1)

[Claims] 1. A display control device for controlling on / off of a power supply of a display device for displaying data by a signal from the data output device body, wherein the data output device body is always turned on when the data output device body is powered on. A detection unit that detects the presence or absence of the supplied basic synchronization signal for display; and a control unit that controls ON / OFF of the power supply of the display device according to the detection result of the detection unit. Display control device.