JPH10268834A - Aggregate type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the destruction due to that a display element of a panel unit and element/circuit for controlling/driving the display element are continued to be driven in an abnormal state by detecting the connection state of a signal line group and turning on/off plural display units based on the detection result. SOLUTION: The output voltage of a panel drive source 32 is divided by a resistor 34 of a panel unit 300 side and the resistor 14 of a control unit 100 side, and the divided voltage is inputted to a panel microcomputer 31 as the panel side connection detective signal of the signal line group 200. Further, by inputting the divided voltage to a control microcomputer 11 as the control unit 100 side connection detective signal of the signal line group 200, even the snapping of a wire of the signal line group and a connection defect in either side of the control unit 100 side or the panel unit 300 side are detected surely. Further, by using this detective signal, the loss of an AC power source is detected/judged, and the whole device is turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage display of a small-capacity display (hereinafter referred to as a panel unit) using a display element such as a plasma display panel (hereinafter referred to as a PDP). More specifically, the present invention relates to a collective display device comprising one large-capacity display device, and more particularly to a collective display device having a protection function for preventing breakage of a display element, an element for driving the display element, and a circuit when an abnormality occurs in the apparatus. The present invention relates to a type display device.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing a configuration of a conventional collective display device using a PDP as a display element, for example, disclosed in Japanese Patent Application Laid-Open No. 4-276792. In the figure, 1 is a control unit as a central control unit, 2 is a signal line group, and 3 is a panel unit as a small-capacity display. 4 is a display element, 5 is a row electrode drive circuit (also called a horizontal drive circuit), 6 is a column electrode drive circuit (also called a vertical drive circuit), 7 is an individual control circuit, 8 is a protection circuit, and 9 is a transmission circuit. And each panel unit (display)
3 is constituted by these. As shown in the figure,
In the conventional collective display device, a plurality of panel units (displays) 3 are connected in multiple stages and configured as one large-capacity display device.

[0003] Control unit (central control unit) 1
Sends out display information (such as a video signal and a synchronization signal) and control signals required for each panel unit 3 to each panel unit 3 via the signal line group 2. The individual control circuit 7 of each panel unit 3 captures only display information and control signals necessary for its own station (that is, its own panel unit), and according to the display information, the row electrode drive circuit 5 and the column electrode drive circuit 5 of the display element 4. A signal is sent to the drive circuit 6 and converted into a drive signal to display a desired image. The individual panel unit 3 includes a protection circuit 8 that monitors the operating state of the individual control circuit 7 and detects normal / abnormal, in addition to the row electrode driving circuit 5 and the column electrode driving circuit 6.

The protection circuit 8 comprises an individual control circuit 7
When the abnormality is detected, the signal to be sent to the row electrode driving circuit 5 and the column electrode driving circuit 6 to the individual control circuit 7 is stopped, and the function as a display is stopped. Further, the output of the protection circuit 8 of each panel unit 3 is set, for example, to be “H” level in a normal state and “L” level in an abnormal state. The signal is transmitted to the signal line group 2 directly connected to the control unit 1. In the conventional collective display device shown in FIG. 6, the control unit 1 constantly monitors the level of the output signal transmitted from the protection circuit 8 of each panel unit 3 via the signal line group 2. If the output of the protection circuit 8 of one of the panel units 3 becomes "L" level, it is detected that the panel unit 3 has an abnormality.

[0005]

In the conventional collective display device as described above, the abnormality of each panel unit (display) 3 can be detected, but the control unit (central control unit) 1 itself has an abnormality. In this case, the system-related abnormality information is not transmitted to the individual panel units 3, and each panel unit 3 continues to display (that is, maintain the power-on state) or the signal line group 2 is disconnected. Also, when the connector of the signal line group 2 is disconnected from the control unit 1 side or the panel unit side 3, such systematic abnormality information is not transmitted to the panel unit 3 side. For example, there is a problem that the panel unit 3 continues to display (keeps a power-on state) even in an abnormal signal state such as a loss of a synchronization signal. .

When the supply of the AC voltage to the control unit (central control unit) 1 is cut off and the power unit is turned off, information on the power off state of the control unit 1 is stored in each panel unit (display unit). 3) The panel unit 3 is kept in a power-on state without being transmitted to the 3 side, and the row electrode driving circuit 5 and the column electrode driving circuit 6 are not driven normally and are destroyed.
There is also a problem that the P display element 4 is destroyed.

Further, even if an error occurs on the panel unit (display) 3 side, only the information that "error has occurred" is transmitted to the control unit (central control unit) 1, and the control unit 1 When the control unit 1 is powered off while the panel unit 3 is repaired and is in the power-off state during the on-state, the control unit 1 is turned off by a power-on / off toggle command, and the display information and image are displayed. Even though the information is lost, the panel unit 3 may be powered on, and the panel unit 3 may continue to display in an abnormal state (keep the power on state).

The present invention has been made to solve the above-described problem, and is not limited to the case where an abnormality occurs in the panel unit (display) 3 but also the case where the abnormality occurs in the control unit (central control unit) 1. Or if there is an abnormality in the connection state of the signal lines, such as disconnection of the signal line group 2 or disconnection of the connector of the signal line group 2, or the AC voltage applied to the panel unit 3 or the control unit 1. Even if the supply is lost, the display device 4 of the panel unit 3 and the device / circuit for controlling / driving the display device 4 in an abnormal state are always set as a system abnormality by immediately turning off the entire device in a power-off state. It is an object of the present invention to realize a highly reliable collective display device capable of preventing destruction due to continued driving.

[0009]

According to the present invention, there is provided a collective display device comprising: a plurality of displays connected in multiple stages each having a display element, a driving circuit thereof, and a control circuit; And a central control unit for transmitting control information, and a central control unit and a signal line group for transmitting information, which are provided between the central control unit and the plurality of displays. A signal line connection state detecting means for detecting a connection state; and a first for power-on / off of at least a plurality of indicators based on a detection result of the signal line connection state detecting means.
Power on / off means.

Further, the central control unit of the collective display device according to the present invention powers on / off the plurality of displays based on the detection results of the AC power-off detecting means and the AC power-off detecting means.
It has a second power on / off means for turning off.

Further, in the signal line connection state detecting means of the collective display device according to the present invention, the driving voltage of the display is divided by a resistor provided on the display and a resistor provided on the central control unit. The signal line connection state is detected by using the obtained voltage value.

Further, the signal line connection state detecting means of the collective display device according to the present invention is characterized in that the output voltage of the standby power supply provided separately from the drive power supply of the display is controlled by the resistor provided on the display side and the central control. The signal line connection state is detected using a voltage value divided by a resistor provided on the unit side.

Further, the second power on / off means of the collective display device according to the present invention synchronizes the power on / off operation of the central control unit with the power on / off operation of the plurality of displays. Things.

[0014] The second power on / off means of the collective display device according to the present invention may include a plurality of display units when the signal line group is not connected to any one of the central control unit and the plurality of displays. This is set in advance so that the power-off operation is performed on the container.

Further, the central control unit of the collective display device according to the present invention includes a third control unit for directly powering on / off the plurality of displays based on the detection results of the AC power-off detecting means and the AC power-off detecting means. It has power on / off means.

Further, the plurality of displays of the collective display device according to the present invention each include a cooling device and a cooling device abnormality detecting means for detecting the presence or absence of an abnormality in the cooling device. Power on / off display based on
A fourth power on / off means for performing an off operation is provided.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. In the drawings, the same reference numerals as those in the related art indicate the same or equivalent parts as those in the related art. Embodiment 1 FIG. FIG. 1 is a diagram showing a configuration of a main part of the collective display device according to the first embodiment. In the figure, 100
Denotes a control unit as a central control unit, 200 denotes a signal line group including a multi-core connection cable, and 300 denotes a panel unit as a small-capacity display. 4 is a display element (for example, PDP), 5 is a row electrode drive circuit (horizontal drive circuit), 6 is a column electrode drive circuit (vertical drive circuit), and 31 is a panel which is a control circuit of the panel unit (display) 300. A microcomputer, 32 is a panel driving power supply, 33 is an input signal processing circuit, and 34 is a resistor, and these constitute a panel unit 300.

Reference numeral 11 denotes a control unit 100
A control microcomputer 12 is an AC off detection circuit, 13 is a secondary side circuit, 14 is a resistor,
The control unit (central control unit) 1
00 is configured. Control unit 100
Transmits, via the signal line group 200, display information (such as a video signal and a synchronization signal) necessary for each panel unit 300 and control information for controlling the operation. Although not shown, the collective display device according to the first embodiment includes a plurality of panel units 30 via signal line groups 200 as in the conventional collective display device shown in FIG.
0 are connected in multiple stages to constitute one large-capacity display device.

First, the configuration of the control unit (central control unit) 100 will be described. AC (that is, AC power supply voltage) is input to the AC off detection circuit 12, and the presence or absence of AC in the power supply voltage is always detected. When the AC-off state (that is, the state where the AC power supply voltage is lost) is detected, the AC-off detection circuit 12 outputs an AC-off detection signal to the control microcomputer 11. Further, a power on / off command is input from the control microcomputer 11 to the secondary circuit 13 provided in the control unit 100. Further, the resistor 14 is connected to the control microcomputer 1
The control-side connection detection signal line (control-side connection detection signal) connected between the control-side connection detection terminal 1 and the ground 14 and connected to the resistor 14 is input to the control microcomputer 11 as a control unit 100-side connection detection signal. ing. Further, the control-side connection detection signal line connected to the resistor 14 and the output signal line of the video signal and the synchronization signal output from the secondary side circuit 13 are a signal line group 200 which is a single multi-core connection cable. Are connected to each of the panel units 300.

Next, the configuration of the panel unit (display) 300 will be described. Among the signal lines of the signal line group 200 from the control unit 100, the line (control side connection detection signal) connected to the resistor 14 of the control unit 100 is connected to the panel side connection detection signal line of the resistor 34 of the panel unit 300 side. Are connected to each other and input to the panel microcomputer 31 as a panel-side connection detection signal. That is, the voltage value "M" at the connection point between the resistor 14 provided on the control unit 100 side and the resistor 34 provided on the panel unit 300 side is used as the control side connection detection signal or the panel side connection detection signal. Panel microcomputer 31
Has been entered.

The output signal lines of the video signal and the synchronizing signal from the secondary circuit 13 of the control unit 100 are connected to each panel unit 30 via a signal line group 200.
0 is input to the input signal processing circuit 33, and the input video signal and synchronization signal are A / D-converted by the input signal processing circuit 33 and rearranged into data optimal for driving the PDP display element 4. It is input to the electrode drive circuit 5 and the column electrode drive circuit 6. The data input to the row electrode driving circuit 5 and the column electrode driving circuit 6 are stored in the display element 4 (for example, PDP).
Is output to drive (drive).

An AC power supply is input to the panel drive power supply 32, and a drive voltage for driving the panel unit 300 is supplied to the panel microcomputer 31 and the input signal processing circuit 3.
3. The power is supplied to the row electrode driving circuit 5 and the column electrode driving circuit 6, and the panel power on / off signal output from the panel microcomputer 31 is also input. Further, the panel power on / off signal output from the panel microcomputer 31 is also input to the input signal processing circuit 33.

Next, the operation of the collective display device according to the first embodiment will be described. The most characteristic of the present invention is that a control unit (central control unit) 100 for preventing the display element 4, the row electrode drive circuit 5, the column electrode drive circuit 6, etc. of the panel unit (display) 300 from being destroyed. In order not to interrupt the synchronization signal from the control unit 100 and the panel unit 300, it is always detected and determined that the signal line group 200 including the synchronization signal output line is securely connected to the control unit 100 and the panel unit 300. The presence or absence of the loss of AC power to the unit 300 is constantly monitored, and if there is any abnormality, the entire apparatus is immediately turned off. When the panel unit 300 is powered on during normal operation, the output voltage (drive voltage) of the panel drive power supply 32 is divided by the resistor 34 on the panel unit 300 side and the resistor 14 on the control unit 100 side. The obtained voltage value “M” is input to the panel microcomputer 31 as a panel-side connection detection signal of the signal line group 200, and the divided voltage value “M” is used to detect the connection of the signal line group 200 on the control unit 100 side. The signal is also input to the control microcomputer 11 as a signal.

The signal line group 200 is connected to the control unit 100 or the panel unit 300.
If the control microcomputer 11 and the panel are disconnected, for example, the control-side connection detection signal of the control unit 100 goes low and the panel-side connection detection signal of the panel unit 300 goes high. The microcomputer 31 determines that the connection of the signal line group 200 has been disconnected, and turns off both the control unit 100 and the panel unit 300.

When the panel unit 300 is powered off for some reason such as loss of AC power, the output (drive voltage) of the panel drive power supply 32 is turned off.
Control microcomputer 1 of control unit 100
The control side connection detection signal input to 1 becomes “L” level, the control microcomputer 11 determines that the panel unit 300 is powered off, and also powers off the control unit 100. Furthermore,
The control unit 100 includes an AC off detection circuit 12
Is provided, and A to the control unit 100 is provided.
When the C power supply is lost, the control microcomputer 11 sends a power-off command to each panel unit via the secondary circuit 13 based on the AC-off detection signal input from the AC-off detection circuit 12. The signal is sent to the signal line group 200 and the control unit 100 is also powered off. When the control unit 100 and the panel unit 300 are powered on, the control microcomputer 11 does not detect and determine the control-side connection detection signal until each panel unit (display) 300 is powered on.

As described above, in the collective display device according to the first embodiment, the output voltage (drive voltage) of the panel drive power supply 32 is controlled by the resistor 34 on the panel unit (display) 300 side and the control unit (central control). Part) 10
The voltage is divided by the resistor 14 on the 0 side, the divided voltage is input to the panel microcomputer 31 as a panel side connection detection signal of the signal line group 200, and the divided voltage is further inputted to the control unit 100 of the signal line group 200. By inputting the signal to the control microcomputer 11 as the side connection detection signal, disconnection of the signal line group and connection failure on either the control unit 100 side or the panel unit 300 side can be reliably detected. Further, by using this detection signal, when the AC power supply on the panel unit 300 side is lost, the control microcomputer 11 on the control unit 100 side detects and judges the state, and the entire apparatus (the control unit 100 and each panel unit) is detected. 300) can be powered off. Also, even when the AC power is lost on the control unit 100 side, the control microcomputer 11 operates the AC off detection circuit 12
, The loss of AC power can be detected and determined, and the entire apparatus (control unit 100 and each panel unit 300) can be powered off.

Embodiment 2 FIG. FIG. 2 is a diagram showing a configuration of a main part of the collective PDP display device according to the second embodiment.
In the figure, 100 is a control unit as a central control unit, 200 is a signal line group composed of multi-core connection cables, and 301 is a panel unit as a small-capacity display. 4 is a display element (for example, PDP), 5 is a row electrode drive circuit (horizontal drive circuit), 6 is a column electrode drive circuit (vertical drive circuit), and 31 is a control circuit of a panel unit (display) 301. A microcomputer, 32 is a panel drive power supply, 33 is an input signal processing circuit, 34 is a resistor, and 35 is a standby power supply. These constitute a panel unit (display) 301.

The control unit 100 sends display information (video signal, synchronization signal, etc.) necessary for each panel unit 301 and control information for controlling the operation via the signal line group 200 to each panel unit 301. . Although not shown, the collective display device according to the second embodiment also includes:
As in the conventional collective display device shown in FIG.
A plurality of panel units (displays) 301 are connected in multi-stages via a P. 00 to constitute one large-capacity PDP display device. The configuration of the second embodiment differs from the configuration of the first embodiment in that a standby power supply 35 is newly provided in the panel unit 301.

The configuration and operation of the control unit 100 are basically the same as those of the first embodiment, and therefore are omitted, and the configuration of the panel unit 301 will be described.
Of the signal lines of the signal line group 200 from the control unit 100, the resistance 1 of the control unit 100
Line connected to 4 (control side connection detection signal)
Is connected to the panel-side connection detection signal line of the resistor 34 on the panel unit 301 side, and is input to the panel microcomputer 31 as a panel-side connection detection signal. That is,
The voltage "M" at the connection point between the resistor 14 provided on the control unit 100 side and the resistor 34 provided on the panel unit 301 side is used as the control side connection detection signal or the panel side connection detection signal.
1 or input to the panel microcomputer 31.

The output signal lines of the video signal and the synchronizing signal from the secondary circuit 13 of the control unit 100 are input to the input signal processing circuit 33 of each panel unit 301 via the signal line group 200, The input video signal and synchronization signal are input to the
The data is D-converted and rearranged into data optimal for driving the display element 4, and is input to the row electrode driving circuit 5 and the column electrode driving circuit 6. Row electrode drive circuit 5 and column electrode drive circuit 6
Is input to drive the display element 4 (drive).
Output to

An AC power supply (power supply voltage) is input to both the panel drive power supply 32 and the standby power supply 35,
The power for driving the panel microcomputer 31 is supplied from a standby power supply 35, and the output voltage of the standby power supply 35 is also applied to one end of the resistor 34.
The output voltage (drive voltage) of the panel drive power supply 32 is
It is supplied to the input signal processing circuit 33, the row electrode drive circuit 5, the column electrode drive circuit 6, and the like, and receives a panel power on / off signal output from the panel microcomputer 31. Further, the panel power on / off signal output from the panel microcomputer 31 is also input to the input signal processing circuit 33.

Next, the operation of the collective display device according to the second embodiment will be described. The feature of the present invention is that, as in the first embodiment, in order to prevent the display element 4, the row electrode drive circuit 5, the column electrode drive circuit 6, and the like of the panel unit 301 from being destroyed, the synchronization from the control unit 100 is prevented. The control unit 1 always detects and determines that the signal line group 200 including the synchronization signal output line is securely connected to the control unit 100 and the panel unit 301 so that the signal is not interrupted.
00 or the loss of AC power to the panel unit 301 is constantly monitored, and if there is any abnormality, the entire apparatus is immediately turned off.

During normal operation, the panel unit 30
When the power supply 1 is powered on, the output of the standby power supply 35 is divided by the resistor 34 on the panel unit 301 side and the resistor 14 on the control unit 100 side. The divided voltage value “M” is also input to the control microcomputer 11 as a control unit side connection detection signal of the signal line group 200 as a panel side connection detection signal to the panel microcomputer 31. Even if the output voltage (drive voltage) of the panel drive power supply 32 is turned off by a power-off command from the control microcomputer 11 or the panel microcomputer 31, the standby state is maintained as long as the AC power to the panel unit 301 is not lost. The output of the power supply 35 is maintained.

Here, signal line group 200 is connected to control unit 100 or panel unit 301.
When the control microcomputer 11 and the panel microcomputer 31 are disconnected, for example, the control-side connection detection signal of the control unit 100 goes low and the panel-side connection detection signal of the panel unit 301 goes high. 31 judges that the connection of the signal line group 200 has been disconnected, and turns off both the control unit 100 and the panel unit 301.

When the AC power supply of the panel unit 301 is lost, the output of the panel drive power supply 32 is turned off, all operations of the panel unit 301 are stopped, and the power supply is turned off. Is also turned off, the panel unit (display) 30
Since the voltage value “M” at the connection point between the resistor 34 on the 1 side and the resistor 14 on the control unit 100 side is zero, the control side connection detection signal input to the control microcomputer 11 of the control unit 100 is at the “L” level. And the control microcomputer 11 is the panel unit 3
01 is determined to be powered off, and the control unit 100 is also powered off.

Further, similarly to the first embodiment, the control unit 100 is provided with an AC off detection circuit 12, and when the AC power to the control unit 100 is lost, the AC input is inputted from the AC off detection circuit 12. A
Based on the C-off detection signal, the control microcomputer 11
Sends a power-off command to each panel unit via the secondary side circuit 13 to the signal line group 200, and also powers off the control unit 100.
The control unit 100 and the panel unit 30
When the power is turned on, the control microcomputer 1
00 is until each panel unit 301 is powered on.
The control side connection detection signal is not detected and judged.

As described above, in the collective display device according to the second embodiment, the panel unit 301 is further provided with the standby power supply 35, and this output is supplied to the resistor 34 and the control unit 100 of the panel unit 301.
The divided voltage is input to the panel microcomputer 31 as a panel side connection detection signal of the signal line group 200, and the divided voltage is further input to the control unit 100 of the signal line group 200. By inputting the connection detection signal to the control microcomputer 11 as well, the disconnection of the signal line group 200 and the control unit 1 are always performed even when the panel unit 301 is in the power-off state.
A connection failure on either the 00 side or the panel unit 301 side can be reliably detected. That is, even if the user tries to turn on the device without noticing that the signal connection state between the control unit (central control unit) 100 and the panel unit (display) 301 is defective, the panel unit (display) 301 is not powered. It is possible to prevent the display element 4, the row electrode drive circuit 5, and the column electrode drive circuit 6 from being broken by an abnormal signal by preventing the display element 4 from being turned on.

As in the case of the first embodiment, by using this detection signal, when the AC power supply of the panel unit 301 is lost, the control microcomputer 11 of the control unit 100 detects and detects the state.
By making a determination, the entire device (the control unit 100 and each panel unit 301 can be powered off. Further, even when the AC power is lost on the control unit 100 side, the control microcomputer 11 keeps the AC
By using the detection signal of the off detection circuit 12, AC
By detecting and judging the loss of power, the entire apparatus (control unit 100 and each panel unit 301) can be powered off.

Embodiment 3 FIG. 3 is a diagram showing a configuration of a main part of the collective display device according to the third embodiment. In the figure, 101 is a control unit as a central control unit, 200 is a signal line group, and 302 is a panel unit as a small-capacity display. 4 is a display element (for example, P
DP), 5 is a row electrode drive circuit (horizontal drive circuit), 6 is a column electrode drive circuit (vertical drive circuit), 31 is a panel microcomputer which is a control circuit of a panel unit (display) 302, 3
Reference numeral 2 denotes a panel driving power supply, and 33 denotes an input signal processing circuit, and these constitute a panel unit 302.

Reference numeral 11 denotes a control microcomputer which is a control circuit of the control unit (central control unit) 101, 12 denotes an AC off detection circuit, and 13 denotes a secondary side circuit, and these constitute the control unit 101. . The control unit 101 sends display information (such as a video signal and a synchronization signal) necessary for each of the panel units 302 and control information for controlling the operation via the signal line group 200 to each panel unit 302. Although not shown, the collective display device according to the third embodiment also includes:
As in the conventional collective display device shown in FIG.
A plurality of panel units 302 are connected in multi-stages through the interface unit 00 to form one large-capacity display device.

First, the configuration of the control unit 101 will be described. AC (that is, AC power supply voltage) is input to the AC off detection circuit 12, and the presence or absence of AC in the power supply voltage is always detected. When the AC-off state is detected, the AC-off detection circuit 12 outputs an AC-off detection signal to the control microcomputer 11. Further, the control microcomputer 11 transmits the video signal and the synchronization signal input to the secondary circuit 13 to the panel unit 302 via the signal line group 200.
Of the panel unit 302 of the panel unit 302 via the secondary side circuit 13 and the signal line group 200 via the secondary side circuit 13 while outputting the power on / off command based on the detection signal from the AC off detection circuit 12 31.

Next, the configuration of the panel unit 302 will be described. The output signal lines of the video signal and the synchronizing signal from the secondary circuit 13 of the control unit 101 are connected to each panel unit 30 via the signal line group 200.
2 is input to the input signal processing circuit 33, and the input video signal and synchronizing signal are A / D-converted by the input signal processing circuit 33 and rearranged into data optimal for driving the display element 4. It is input to the drive circuit 5 and the column electrode drive circuit 6. The data input to the row electrode driving circuit 5 and the column electrode driving circuit 6 are output to drive (drive) the display element 4. The AC power supply is a panel drive power supply 3
2, the output voltage (drive voltage) of the panel drive power supply 32 is supplied to the input signal processing circuit 33, the row electrode drive circuit 5, the column electrode drive circuit 6, and the like. / OFF signal output is input. Further, the panel power on / off signal output from the panel microcomputer 31 is also input to an input signal processing circuit.

Next, the operation of the collective display device according to the third embodiment will be described. The feature of the present invention is that the control unit 101 is controlled so that the synchronization signal from the control unit 101 is not interrupted in order to avoid the destruction of the display element 4, the row electrode drive circuit 5, the column electrode drive circuit 6, etc. of the panel unit 302. The configuration is such that the power on / off state and the power on / off state of the panel unit 302 operate in synchronization. When the control unit 101 is powered on, a power-on command is output from the control microcomputer 11 and the panel microcomputer 31 is not powered until the power-on command is input to the panel microcomputer 31 of the panel unit 302 via the signal line group 200. An ON command is output, and panel unit 302 is powered on.

When the control unit 101 is powered off, a power off command is output from the control microcomputer 11, and the power off command is input to the panel microcomputer 31 of the panel unit 302 via the signal line group 200. For the first time, the panel microcomputer 31 outputs a power-off command and the panel unit 302
Powers off. Further, when the signal line group 200 is disconnected at the connection portion with the control unit 101 or the connection portion with the panel unit 302, in such a case, one of the input signals of the panel microcomputer 31 on the panel unit 302 side is output. By setting the input signal level so that the signal state becomes the same as that when the power-off command is received, the panel microcomputer 31 outputs the power-off command even when the signal line group 200 has a poor connection. , The panel unit 302 can be powered off.

As described above, in the collective display device according to the third embodiment, the power ON / OFF state of the control unit (central control unit) 101 and the panel unit (display) are realized with a simple circuit configuration. Since the power on / off state of the power supply 302 is configured to operate in synchronization, the control unit (central control unit)
Although the panel unit 302 is powered on even though the power of 101 is off, the display element 4, the row electrode drive circuit 5, the column electrode drive circuit 6, etc. operate in an abnormal signal state in which the synchronization signal is interrupted. It can be prevented from operating and leading to destruction. Further, since the panel microcomputer 31 is set to output the power-off signal in response to the connection failure of the signal line group 200, the panel unit 302 is powered off even if the connection failure of the signal line group 200 occurs. Also, it is possible to prevent the PDP display element 4, the row electrode drive circuit 5, the column electrode drive circuit 6 and the like from operating and destroying in an abnormal signal state in which the synchronization signal is interrupted.

Embodiment 4 FIG. FIG. 4 is a diagram showing a configuration of a main part of the collective display device according to the fourth embodiment. In the figure, 102 is a control unit as a central control unit, 200 is a signal line group, and 302 is a panel unit as a small-capacity display. 4 is a display element (for example, P
DP), 5 is a row electrode drive circuit (horizontal drive circuit), 6 is a column electrode drive circuit (vertical drive circuit), 31 is a panel microcomputer which is a control circuit of a panel unit (display) 302, 3
Reference numeral 2 denotes a panel drive power supply, and 33 denotes an input signal processing circuit, and these constitute a panel unit (display) 302.

Reference numeral 11 denotes a control microcomputer which is a control circuit of a control unit (central control unit) 102, 12 denotes an AC off detection circuit, and 13 denotes a secondary side circuit. Is configured. Control unit 1
Numeral 02 sends out display information (such as a video signal and a synchronizing signal) necessary for each panel unit 302 and control information for controlling the operation via the signal line group 200. Although not shown, the collective display device according to the fourth embodiment also includes a plurality of panel units (displays) 302 via the signal line group 200 similarly to the conventional collective display device shown in FIG. Are connected in multiple stages to constitute one large-capacity display device.

First, the configuration of the control unit 102 will be described. AC (that is, AC power supply voltage) is input to the AC off detection circuit 12, and the presence or absence of AC in the power supply voltage is always detected. When the AC-off state is detected, the AC-off detection circuit 12 outputs an AC-off detection signal to the control microcomputer 11 and simultaneously outputs the signal line group 2
00 is also output to the panel microcomputer 31 on the panel unit 302 side. The control microcomputer 1
1 outputs the video signal and the synchronization signal input to the secondary circuit 13 to the input signal processing circuit 33 of the panel unit 302 via the signal line group 200.

Next, the configuration of the panel unit 302 will be described. The output signal lines of the video signal and the synchronizing signal from the secondary circuit 13 of the control unit 102 are connected to each panel unit 30 via the signal line group 200.
2 is input to the input signal processing circuit 33, and the input video signal and synchronizing signal are A / D-converted by the input signal processing circuit 33 and rearranged into data optimal for driving the display element 4. It is input to the drive circuit 5 and the column electrode drive circuit 6. The data input to the row electrode driving circuit 5 and the column electrode driving circuit 6 are output to drive (drive) the display element 4. The AC power supply is a panel drive power supply 3
The output voltage (drive voltage) of the panel drive power supply 32 is supplied to the input signal processing circuit 33, the row electrode drive circuit 5, the column electrode drive circuit 6, and the like. Further, a panel power on / off signal based on the AC off detection signal from the control unit 102 is output from the panel microcomputer 31 and is applied to the panel drive power supply 32 and the input signal processing circuit 33.

Next, the operation of the collective display device according to the fourth embodiment will be described. The feature of this embodiment is that the panel unit 3 is similar to the first to third embodiments.
02 to prevent the display element 4, row electrode drive circuit 5, and column electrode drive circuit 6 from being destroyed.
In order to prevent interruption of the synchronization signal from the control unit 102, the panel unit 302 operates so as to be quickly turned off when the AC power input to the control unit 102 is lost. When the AC power input to the control unit 102 is lost,
The AC-off detection circuit 12 quickly outputs the AC-off detection signal not only to the control microcomputer 11 but also to the signal line group 20.
0 to the panel microcomputer 31 on the panel unit 302 side.

The panel microcomputer 31 to which the AC-off detection signal has been directly input from the control unit 102 outputs a power-off command of the panel unit 302 in anticipation of the control unit 102 being powered off.
The panel unit 302 is powered off. Similarly to the third embodiment, when the signal line group 200 is disconnected at the connection portion with the control unit 102 or the connection portion with the panel unit 302, in such a case, the panel unit 302 side By setting the input signal level so that one of the input signals of the panel microcomputer 31 has the same signal state as when the power-off command is received, the panel microcomputer 31 can operate when the signal line group 200 has a poor connection. Can output a power-off command to power off the panel unit 302.

As described above, in the collective display device according to the fourth embodiment, the AC off detection signal of control unit (central control unit) 102 is directly transmitted to panel unit (display) 302 through signal line group 200. It is input to the panel microcomputer 31 and the panel unit 3 is
02, the panel unit 302 can be reliably powered off before the synchronizing signal from the control unit 102 is interrupted, so that the panel unit 302 can be turned off even for a short time. The display element 4, the row electrode drive circuit 5, the column electrode drive circuit 6, and the like can be prevented from operating in an abnormal signal state in which the synchronization signal is interrupted, and a more reliable collective display device can be realized. it can. It is needless to say that the same effect can be obtained by adopting the configuration of the first or second embodiment with respect to disconnection or poor connection of the signal line group 200.

Embodiment 5 FIG. 5 is a diagram showing a configuration of a main part of the collective display device according to the fifth embodiment. In the figure, reference numeral 103 denotes a control unit as a central control unit, 200 denotes a signal line group, and 303 denotes a panel unit which is a small-capacity display. 4 is a display element (for example, P
DP), 5 is a row electrode drive circuit (horizontal drive circuit), 6 is a column electrode drive circuit (vertical drive circuit), 31 is a panel microcomputer which is a control circuit of a panel unit (display) 303, 3
3 is an input signal processing circuit, 36 is a panel drive power supply, 37 is an error detection circuit, 38 is a panel unit (display) 30
3 is a cooling device for cooling the elements and circuits of the third embodiment, and these constitute a panel unit (display) 303.

Reference numeral 11 denotes a control microcomputer which is a control circuit of the control unit (central control unit) 103; 12, an AC off detection circuit; and 13, a secondary circuit, which constitutes the control unit 103. . The control unit 103 sends display information (such as a video signal and a synchronization signal) necessary for each of the panel units 303 and control information for controlling operations via the signal line group 200 to each panel unit 303. Although not shown, the collective display device according to the fifth embodiment also includes:
As in the conventional collective display device shown in FIG.
00, a plurality of panel units 303 are connected in multiple stages to constitute one large-capacity display device.

First, the configuration of the control unit 103 will be described. AC (that is, AC power supply voltage) is input to the AC off detection circuit 12, and the presence or absence of AC in the power supply voltage is always detected. When the AC-off state is detected, the AC-off detection circuit 12 outputs an AC-off detection signal to the control microcomputer 11 and simultaneously outputs the signal line group 2
00 is also output to the panel microcomputer 31 on the panel unit 303 side. The control microcomputer 1
Reference numeral 1 denotes a panel unit (display unit) 30 for transmitting a video signal or a synchronization signal input to the secondary circuit 13 through a signal line group 200.
3 to the input signal processing circuit 33. The control microcomputer 11 has a panel unit 30 as described later.
The detection signal of the error detection circuit 37 provided in 3 is input.

Next, the configuration of the panel unit 303 will be described. The output signal lines of the video signal and the synchronization signal from the secondary circuit 13 of the control unit 103 are connected to each panel unit 30 via the signal line group 200.
3 is input to the input signal processing circuit 33, and the input video signal and synchronizing signal are A / D-converted by the input signal processing circuit 33 and rearranged into data optimal for driving the display element 4. It is input to the drive circuit 5 and the column electrode drive circuit 6. The data input to the row electrode driving circuit 5 and the column electrode driving circuit 6 are output to drive (drive) the display element 4.

The AC power is input to the panel drive power supply 36, and the output voltage (drive voltage) of the panel drive power supply 36
Are supplied to the input signal processing circuit 33, the row electrode drive circuit 5, the column electrode drive circuit 6, the error detection circuit 37, the cooling device 38, and the like. Further, a signal that can constantly monitor whether the panel drive power supply 36 and the cooling device 38 are operating normally and determine the error is also input to the error detection circuit 37. A panel power on / off signal based on an AC off detection signal from the control unit 103 is output from the panel microcomputer 31 and input to the panel driving power supply 36 and the input signal processing circuit 33.

Next, the operation of the collective display device according to the fifth embodiment will be described. The feature of the present embodiment is that in each of the panel units 303, the display device 4 of the panel unit 303,
In order to avoid destruction of the row electrode driving circuit 5 and the column electrode driving circuit 6, the panel unit 303 is promptly turned off when the AC power input to the control unit 103 is lost so that the synchronization signal from the control unit 103 is not interrupted.
Is turned off, and the error detection circuit 37 of each panel unit 303 operates when the operation of the panel drive power supply 36 and the cooling device 38 is abnormal (for example, a power supply short circuit or a cooling fan stop). Immediately, an abnormality is detected, and a detection signal (for example, a power supply short-circuit detection signal or a cooling fan stop detection signal) is input to the panel microcomputer 31 and the control microcomputer 11 of the control unit 103, and the panel unit 303 and the control unit 103 are powered. It is to operate to turn off.

As described above, according to the fifth embodiment, in the collective display device provided with the cooling device 38 in the panel unit (display) 303, the AC power input of the control unit (central control unit) 103 is lost. Then, the panel unit 303 is immediately turned off, and if an abnormal condition occurs in the panel drive power supply 36 or the cooling device 38, the control unit 103 and the panel unit 3 are immediately turned off based on the detection signal.
03 can be placed in a power-off state, so that destruction due to the operation of the display element 4, the row electrode drive circuit 5, or the column electrode drive circuit 6 in an abnormal signal state can be prevented, and the malfunction of the cooling device 38 can be prevented. The destruction of these elements and circuits due to the temperature rise of the panel unit (display) 303 can also be prevented.

In the first to fifth embodiments, the display element of each panel unit (display) is P
The case where a DP (plasma display panel) is used has been described, but the display element of the present invention is not limited to this, and another element such as a liquid crystal display device may be used.

[0061]

As described above, according to the collective display device of the present invention, a plurality of displays connected in multiple stages including a display element, a drive circuit thereof, and a control circuit, and a plurality of displays are provided. A central control unit that sends display information and control information to the central control unit and the plurality of displays;
A signal line connection state detecting means for detecting a connection state of the signal line group; and at least a plurality of signal line connection state detection means for detecting a connection state of the signal line group. Since the first power on / off means for powering on / off the display device is provided, it is possible to power off the display device when the connection state of the signal line group is poor, so that there is no synchronization signal. There is an effect that it is possible to prevent the display element and the drive circuit from operating in an abnormal signal state and leading to destruction.

Further, according to the collective display device of the present invention, the central control unit powers on / off the plurality of displays based on the detection results of the AC power-off detecting means and the AC power-off detecting means. The power on / off means of the present invention allows the display to be powered even when the supply of AC power to the central control unit is lost and the display information and control information necessary for the display cannot be transmitted. It can be turned off, and there is an effect that it is possible to prevent the display element and the drive circuit from operating in an abnormal signal state in which the synchronization signal has disappeared, and to prevent destruction.

Further, according to the collective display device of the present invention, the signal line connection state detecting means separates the driving voltage of the display by the resistance provided on the display and the resistance provided on the central control unit. Since the signal line connection status is detected using the compressed voltage value, the disconnection of the signal line group and the connection failure on either side of the central control unit or the display unit can be reliably achieved with a simple configuration. This has the effect that it can be detected.

Further, according to the collective display device of the present invention, the signal line connection state detecting means detects the output voltage of the standby power supply provided separately from the drive power supply of the display with the resistor provided on the display side. Since the signal line connection state is detected using the voltage value divided by the resistor provided on the central control unit side, even if the display unit is in the power-off state, the signal line group is always disconnected or the center is disconnected. This is effective in that a connection failure on either the control unit side or the display side can be reliably detected.

Further, according to the collective display device of the present invention, the second power on / off means synchronizes the power on / off operation of the central control unit with the power on / off operation of the plurality of displays. Therefore, the display unit is powered on even though the central control unit is powered off, and the display element and the drive circuit operate in an abnormal signal state where the synchronization signal is interrupted, leading to destruction. There is an effect that can be prevented.

Further, according to the collective display device of the present invention, the second power on / off means is provided when the signal line group is not connected to any one of the central control unit and the plurality of displays. The display is set in advance to perform power-off operation, so it is possible to turn off the display even if a signal line group connection failure occurs with a simple configuration, There is an effect that it is possible to prevent the display element and the drive circuit from operating and causing destruction in an appropriate signal state.

Further, according to the collective display device of the present invention, the central control unit directly powers on / off the plurality of displays based on the detection results of the AC power-off detecting means and the AC power-off detecting means. Since the power on / off means of the third aspect is provided, it is possible to reliably power off the display before the synchronization signal from the central control unit is interrupted, so that the display element and the drive circuit can be operated for a short time. Is effective in preventing operation in an abnormal signal state in which a synchronization signal is interrupted.

Further, according to the collective display device of the present invention, each display has a cooling device and a cooling device abnormality detecting means for detecting the presence or absence of an abnormality in the cooling device. The fourth power on / off means for powering on / off the display device based on the above is provided, so that the temperature of the display device rises due to abnormality or stoppage of the operation of the cooling device. This has the effect of preventing the circuit from being destroyed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a main part of a collective display device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a main part of a collective display device according to a second embodiment of the present invention;

FIG. 3 is a diagram showing a configuration of a main part of a collective display device according to a third embodiment of the present invention;

FIG. 4 is a diagram showing a configuration of a main part of a collective display device according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a main part of a collective display device according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a conventional collective display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Control unit (central control part) 2 Signal line group 3 Panel unit (display) 4 Display element 5 Row electrode drive circuit 6 Column electrode drive circuit 7 Individual control circuit 8 Protection circuit 9 Transmission circuit 10 Control 11 Control microcomputer 12 AC off Detection 13 Secondary circuit 14 Resistance 20 Signal line group 30 Panel unit (display) 31 Panel microcomputer 32 Panel drive power supply 33 Input signal processing circuit 34 Resistance 35 Standby power supply 36 Panel drive power supply 37 Error detection circuit 38 Cooling device 100, 101 , 102, 103 Control unit (central control unit) 200 Signal line group 300, 301, 302, 303 Panel unit (display)

Claims (8)

[Claims] A plurality of displays connected in multiple stages each having a display element, a driving circuit thereof, and a control circuit; a central control unit for transmitting display information and control information to the plurality of displays; A signal line connection state detecting means for detecting a connection state of the signal line group, wherein the collective display device is provided between a control unit and the plurality of display devices and includes a signal line group for transmitting information. A first power-on / off switch for at least the plurality of indicators based on a detection result of the signal line connection state detection means;
A collective display device comprising: a power on / off means. 2. The power supply control apparatus according to claim 1, wherein the central control unit includes an AC power-off detecting unit and a second power-on / off unit that powers on / off the plurality of indicators based on a detection result of the AC power-off detecting unit. The collective display device according to claim 1, wherein: 3. The signal line connection state detecting means uses a voltage value obtained by dividing a drive voltage of the display by a resistor provided on the display side and a resistor provided on the central control unit side. 3. The collective display device according to claim 1, wherein a state is detected. 4. The signal line connection state detecting means separates an output voltage of a standby power supply provided separately from a drive power supply of the display by a resistor provided on the display and a resistor provided on the central control unit. 3. The collective display device according to claim 1, wherein a signal line connection state is detected using the compressed voltage value. 5. The collective type according to claim 2, wherein the second power on / off means synchronizes the power on / off operation of the central control unit with the power on / off operation of the plurality of displays. Display device. 6. The second power on / off means performs power off operation on a plurality of displays when the signal line group is not connected to any of the central control unit and the plurality of displays. The collective display device according to claim 2, wherein the display is set in advance. 7. The central control unit includes AC power-off detecting means and third power-on / off means for directly powering on / off a plurality of indicators based on a detection result of the AC power-off detecting means. The collective display device according to claim 1, wherein: 8. A plurality of displays each including a cooling device and a cooling device abnormality detecting means for detecting whether or not the cooling device is abnormal, and powering on the display based on a detection result of the cooling device abnormality detecting means. 2. The collective display device according to claim 1, further comprising a fourth power on / off means for performing an on / off operation.