WO2013005328A1

WO2013005328A1 - Display system

Info

Publication number: WO2013005328A1
Application number: PCT/JP2011/065571
Authority: WO
Inventors: 優悦郎小林
Original assignee: Ｎｅｃディスプレイソリューションズ株式会社
Priority date: 2011-07-07
Filing date: 2011-07-07
Publication date: 2013-01-10

Abstract

Each of a plurality of display devices has: a first reception unit (10) which analyzes a first code in order to output, to a control unit, a first control signal indicating that a display device should transit from the current control state; a second reception unit (20) which analyzes a second code in order to output, to the control unit, a second control signal indicating the control state to which the display device should transition; a transmission unit (40) which, upon being input with a third control signal output by the control unit, outputs a third code indicating a control state to which a display device of the next stage should transition; and a control unit (30) which, on the basis of the first control signal or the second control signal, shifts the display device from the current control state to another control state, and performs instruction to output a third code to the transmission unit so that the second-mentioned control state becomes the control state to which the display device of the next stage is to transition.

Description

Display system

The present invention relates to a display system configured by connecting display devices in cascade.

A display system is known in which a plurality of display devices are connected in cascade and a command is transmitted using an infrared remote controller (hereinafter referred to as an IR remote controller) to display a common video on the display unit of all the display devices. (See Patent Document 1 and Patent Document 2).

In order to drive these display systems, the configuration generally described below is adopted. That is, a power-on or power-off control signal (command) is transmitted to the signal receiving unit of the first-stage display device among the cascade-connected display devices with the IR remote controller directed. The first-stage display device transmits this power-on or power-off command to the second-stage display device via a cable or the like. The second and subsequent display devices receive a power-on or power-off command transmitted from the previous display device, and sequentially transfer the power-on or power-off command to the subsequent display device via a cable or the like. It has a configuration.

By the way, each display device constituting the display system is often designed to perform a toggle operation that reverses the power-on or power-off state each time a single power-on or power-off command is received. . Here, the toggle operation refers to an operation of changing a plurality of control states by rotation every time a single command is received. In the case of two-state control such as power-on or power-off, the operation is reversed.

If the user sends a command to such a display system that toggles with a single command without knowing the control state at that time, the display system may behave unexpectedly by the user. .
For example, consider a case where all display devices are in the same control state and power-on state, and a power-on or power-off command is input to the display system. In this case, if one display device in the middle of the column connection fails to receive a command from the previous stage due to the influence of noise or the like, the subsequent display devices following that one display device are controlled by the command. It does not enter the state (in this case, the power is off). Furthermore, even if a power-on or power-off command is supplied, the display devices subsequent to the display device that failed to be received are now switched from the power-on state to the power-off state, and the control state of the entire system is the same. It cannot be secured.

As described above, when a plurality of display devices constituting the display system have different control states of the respective display devices (there is non-identity between a power-on state and a power-off state), the display system is turned on or off. When the command is input, each display device enters the opposite control state (when the power is on, the power is off, and when the power is off, the power is on), and the expected operation (for example, all the power is on). The problem of not becoming.

This is based on the premise that the display device is in a power-on or power-off control state with one key of the IR remote controller, and when the remote control method of the display device is originally considered as communication This phenomenon occurs because there is no compensation for transmission errors. Note that “no compensation for transmission mistake” means that even if the display device fails to receive a command, the user only has to press the IR remote controller again, and there is no need to compensate for the transmission mistake. Meaning.

In order to solve the problem of toggle control in such a display system, the problem is solved if the display device has commands corresponding to all control states. That is, in the above example, if the power-on command and the power-off command are different, the display device continues to power on even if the power-on command is received repeatedly during power-on. Therefore, no inconvenience occurs. However, giving independently corresponding commands to each of the many control states of the display device increases the number of commands, thereby increasing the number of keys of the IR remote controller and the burden on the control unit in the display device. Because there are many points, it is not a practical solution.
Note that Patent Literature 1 and Patent Literature 2 do not disclose a technique regarding the toggle operation of the display system.

JP 2001-218232 A JP 2003-319478 A

The problem to be solved is that a command is transmitted to a display system that is composed of cascade-connected display devices and toggles with a single command without knowing the control state of each display device at that time. In this case, the same control state of the display devices constituting the display system cannot be ensured.

In the present invention, every time a code indicating a control state to be transitioned is input, the control state sequentially changes to the n control states in the first to n-th (n is a natural number and n ≧ 2) states. A display system configured by cascading display devices, wherein the first display device among the tandemly connected display devices is arranged based on a control state to which the display device indicated by the code should transition. A code different from the code indicating the control state to be transferred to the next stage display device is output to the subsequent display device while transitioning to the control state, and the first display device among the cascade connected display devices is output. The other display devices other than the display device receive the code from the preceding display device, and the display device transits to the control state based on the control state to which the display device indicated by the code should transit, and the control state Shown as control state to be transitioned next stage of the display device, outputs a different code to the subsequent display and the code, it is characterized.

In the display system of the present invention, each of the display devices connected in cascade receives the first code, analyzes the first code, and indicates a control state to which the display device should transition. The first receiving unit that outputs the control signal to the control unit and the second code from the previous display device are received and the second code is analyzed to indicate the control state that the display device should transition to When a second receiving unit that outputs to the control unit as a second control signal and a third control signal that is output from the control unit are input, the second display device indicates a control state that should be shifted to the next display device. 3 and the first receiving unit or the second receiving unit determine whether the receiving unit has received a signal, and the first control signal or the second control unit Based on the control state to which the display device indicated by the signal should transit, And a control unit that instructs the transmission unit to output the third code so that the control state becomes a control state that the next-stage display device should transition to, The first display device of the display devices connected in cascade has the first receiver receive the first code, and the third code is sent to the second display device of the rear display device. The other display devices except the first and last display devices among the display devices connected to each other in the cascade connected to the reception unit, the second reception unit is the third display from the transmission unit of the previous display device. The second code is received as the second code, the third code is output to the second receiving unit in the subsequent stage, and the display device in the last stage among the display devices connected in cascade is the second code. The third receiving unit from the transmitting unit of the display device in the previous stage Receiving an over-de as the second code, characterized in that.

In the display system of the present invention, n = 2, and one of the first state and the second state is a power-on state, and the other is a power-off state.

The display system of the present invention further includes an IR remote controller that supplies the first code to the first display device among the cascade-connected display devices when a user inputs a command. .

According to the present invention, each display device causes the display device to transition to the control state based on the control state to which the display device indicated by the received code should transition, and the display device in the next stage displays the control state. In this configuration, a code different from the received code, which is indicated as a control state to be changed, is output to the display device at the next stage. Therefore, the display system of the present invention transmits the command intended by the user without confirming the control state of each display device, even for a display device that toggles with a single command. As a result, it is possible to ensure the same control state of the display devices constituting the display system.

It is a schematic block diagram which shows the structure of the display system in one Embodiment of this invention. It is a schematic block diagram which shows the structure of the display apparatus i. It is a figure for demonstrating the transition to the power-on state of the display system shown to FIG. 1A. It is a figure for demonstrating the transition to the power-off state of the display system shown to FIG. 1A. It is a figure for demonstrating the control by various commands.

Hereinafter, a display system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a schematic block diagram showing the configuration of the display system 100.
As shown in FIG. 1A, a display system 100 includes a plurality of (n) display devices DISP1 (display 1), display devices DISP2 (display 2),..., Display devices DISPn (display n) connected in cascade. An IR remote controller that transmits a control signal (command) to the display device DISP1 is configured. In the present embodiment, the case where the number n of display devices is nine will be described, but the number is not limited to this number.
The IR remote controller has a plurality of keys, and the user presses the keys to supply commands to the display device DISP1, and the display system displays a common image on the display unit (display) in normal operation. Transition to the control state.
Hereinafter, the control state in the display system 100 will be described focusing on the power-on state and the power-off state. Note that the power-on or power-off command is a single command, and hereinafter, the command output by the IR remote controller will be referred to as a first code.

FIG. 1B is a block diagram showing the configuration of each of the display devices DISi (i = 1 to n, n = 9) constituting the display system 100. As shown in FIG. 1B, the display device DISPi includes a remote control code light receiving unit 10, a remote control code input unit 20, a control unit 30, and a remote control code output unit 40. As shown in FIG. 1A, the remote control code output unit 40 in the first display device DISP1 is connected to the remote control code input unit 20 in the second display device DISP2 via a cable or the like. Similarly, in the display devices DISP2 to DISPn, the remote control code output unit 40 of the previous display device is connected to the remote control code input unit 20 of the next display device via a cable or the like.

The remote control code light receiving unit 10 receives an infrared remote control signal (first code) from the IR remote controller and analyzes the received optical signal. The remote control code light receiving unit 10 indicates that the current control state should be shifted to another control state (inverted control state if 2 states, transition to next control state if 3 states or more). Show) The first control signal is output to the control unit 30.
The remote control code input unit 20 receives the third code output from the display device in the previous stage as the second code, analyzes the second code, and determines the control state to which the display device DISPi should transition as the analysis result. It transmits to the control part 30 as a 2nd control signal shown.

The control unit 30 drives a display display unit (not shown) based on the first control signal from the remote control code light receiving unit 10 or the second control signal from the remote control code input unit 20 to display the display device DISPi. It controls the operation or power on / off of the display device DISPi.
For this reason, in this embodiment, the control unit 30 determines which receiving unit of the remote control code light receiving unit 10 (first receiving unit) or the remote control code input unit 20 (second receiving unit) has received the signal. judge. For example, the control unit 30 of the display device DISPi has a flag in which data is set in advance. In the first display device DISP1, data 1 is set in the flag, and in other display devices, data 0 is set in the flag. The configuration. These flags can be set by allowing a user who constructs a display system to store 1 in the flag of the first display device DISP1 and 0 in the flags of other display devices when the display devices DISPi are connected in cascade. In this case, the control unit 30 in the display device DISP1 determines that the remote control code light receiving unit 10 is receiving a remote signal with reference to the flag data 1, and the first signal from the remote control code light receiving unit 10 is determined. A control signal is received. The control unit 30 in the other second and subsequent display devices refers to the flag data 0 to determine that the remote control code input unit 20 has received the third code from the previous display device, and inputs the remote control code. The second control signal from the unit 20 is received. As a configuration for distinguishing the display device DISP1 from other display devices, the following configuration may be used instead of using the flag described above. That is, in the second and subsequent display devices, the remote control code input unit 20 is connected to the remote control code output unit 40 of the previous display device via a cable or the like. Therefore, when a cable or the like is connected to the remote control code input unit 20, the control unit 30 may be configured to block the first control signal from the remote control code light receiving unit 10. In this way, in the display device 1, the control unit 30 receives the first control signal from the remote control code light receiving unit 10, and in the display devices subsequent to the display device 2, the control unit 30 performs the remote control code. The second control signal from the input unit 20 can be received.

The control unit 30 causes the display device DISPi to transition to the control state based on the control state to which the display device DISi indicated by the first control signal or the second control signal should transition. That is, if it is the control part 30 of the display apparatus DISP1 of the first stage, based on the 1st control signal from the remote control code light-receiving part 10, for example, if the display apparatus is in a power-off state, the first control signal is controlled. Since the state is shown to shift to another control state, control for shifting each circuit constituting the display device from the power-off state to the power-on state is executed.
Further, the control unit 30 of the first-stage display device DISP1 outputs a third control signal indicating the control state (in this case, the power-on state) to the remote control code output unit 40. Note that the control unit 30 of the first-stage display device DISP1 may output a third control signal to the remote control code output unit 40 in response to the result of actually controlling the peripheral circuit, or start control of the peripheral circuit. The third control signal may be output at the same time as the start. When the third control signal is input, the remote control code output unit 40 of the display device DISP1 at the first stage controls the control state that the display device at the next stage should transition from among the codes determined in advance by the specifications of the display device DISPi. The third code indicating (in this case, the power is on) is selected and output to the remote control code input unit 20 of the display device at the next stage.
Thus, the remote control code input unit 20 of the second-stage display device DISP2 receives the third code as the second code, and the third code is in a state to be shifted to the display device DISP2 (in this case, the power on State), a second control signal indicating the state to which the display device DISP2 should shift is output to the control unit 30. As described above, the control unit 30 of the display device DISP2 receives the second control signal from the remote control code input unit 20, and controls each circuit constituting the display device DISP2 in the control state indicated by the second control signal (this In this case, control to shift to the power-on state) is executed. In addition, the control unit 30 of the display device DISP2 outputs the third control signal to the remote control code output unit 40 in order to set the control state indicated by the second control signal to the control state to which the next-stage display device should shift. To do. When the third control signal is input, the remote control code output unit 40 of the display device DISP2 controls the control state (this is to be changed) from the code determined in advance by the specification of the display device DISP2. The third code indicating the power-on state) is selected and output to the remote control code input unit 20 of the display device at the next stage. Thereafter, the same processing as that of the second-stage display device DISP2 is executed after the third-stage display device DISP3, and the control states (in this case, the power-on state) of the respective display devices are the same.

2A and 2B are diagrams for explaining the transition of the display system to the power-on state and the power-off state. FIG. 2A shows the transition to the power-on state, and FIG. 2B shows the transition to the power-off state.
As shown in FIG. 2A, for example, the user presses the power key of the IR remote controller in order to change the display system 100 to the power-on state. The IR remote controller indicates that the display system should shift from the current control state to another control state (in this case, all indicate that the display system shifts to a power-on state, which is an inverted state of the power-off state). A signal (first code) is output to the display device DISP1.
The remote control code input unit 20 in the first display device outputs a first control signal indicating that the current control state should be shifted to another control state to the control unit 30. Based on the first control signal, the control unit 30 turns on each circuit constituting the display device DISP1. Further, the control unit 30 outputs a third control signal indicating the control state (power-on state) to the remote control code output unit 40. The remote control code output unit 40 outputs a third code as a code indicating a control state that the display device at the next stage should transition from a code determined in advance by the specification of the display device DISPi.

The remote control code input unit 20 in the second and subsequent display devices receives the third code input from the remote control code output unit 40 in the previous display device as the second code, and the second code is displayed on the display device. Since the DISPi indicates the transition to the power-on state as the control state to be transitioned, the second control signal indicating the transition to the power-on state is output to the control unit 30. In response to this, the control unit 30 turns on each circuit constituting the display device DISPi.
Further, the control unit 30 outputs a third control signal indicating the control state to the remote control code output unit 40. The remote control code output unit 40 outputs the third code to the remote control code input unit 20 of the display device at the next stage based on an instruction from the control unit 30.

As described above, the code (the third code indicating transition of the display device to the power-on state) is sequentially transferred from the front display device to the subsequent display device.
Finally, the remote control code input unit 20 in the nth display device DISPn receives the third code input from the remote control code output unit 40 in the (n−1) th display device as the second code. The display device DISn outputs a second control signal indicating the transition to the power-on state to the control unit 30 as the control state to be transitioned. The control unit 30 turns on each circuit constituting the display device DISPn. In this way, all the display devices constituting the display system shift to the same control state (in this case, the power-on state).

Further, as shown in FIG. 2B, for example, the user presses the power key of the IR remote controller following the state shown in FIG. 2A in order to change the display system 100 from the power-on state to the power-off state. The IR remote controller indicates that the display system should shift from the current control state to another control state (in this case, all indicate that the display system shifts to a power-off state, which is an inverted state of the power-on state). A signal (first code) is output to the display device DISP1.
The remote control code input unit 20 in the first display device outputs a first control signal indicating that the current control state should be shifted to another control state to the control unit 30. Based on the first control signal, the control unit 30 in the display device DISP1 turns off each circuit constituting the display device DISP1. Further, the control unit 30 outputs a third control signal indicating the control state to the remote control code output unit 40. The remote control code output unit 40 outputs a third code as a code indicating a control state to be changed by the next-stage display device from codes determined in advance by the specifications of the display device.

The remote control code input unit 20 in the second and subsequent display devices receives the third code input from the remote control code output unit 40 in the previous display device as the second code, and the second code is displayed on the display device. Indicates a transition to the power-off state as the control state to be transitioned, and therefore outputs a second control signal indicating the transition to the power-off state to the control unit 30. In response to this, the control unit 30 turns off the circuits constituting the display device.
Further, the control unit 30 outputs a third control signal indicating the control state to the remote control code output unit 40. The remote control code output unit 40 outputs the third code to the remote control code input unit 20 of the display device at the next stage based on an instruction from the control unit 30.
As described above, the code (the third code indicating that the display device is shifted to the power-off state) is sequentially transferred from the front display device to the subsequent display device.
Finally, the remote control code input unit 20 in the nth display device DISPn receives the third code input from the remote control code output unit 40 in the (n−1) th display device as the second code. Then, the second control signal indicating the transition to the power-off state is output to the control unit 30 as the control state to which the display device DISPn should transition. The control unit 30 turns off the circuits constituting the display device DISPn. In this way, all the display devices constituting the display system shift to the same control state (in this case, the power-off state).

As described above, according to the present invention, each display device puts the display device into the control state based on the control state to which the display device indicated by the received code (first code or second code) should transition. In addition to the transition, the control state is indicated as a control state that the next-stage display device should transition to, and a code (third code) different from the received code is output to the next-stage display device. Therefore, the display system of the present invention transmits the command intended by the user without confirming the control state of each display device, even for a display device that toggles with a single command. As a result, it is possible to ensure the same control state of the display devices constituting the display system.

In the description of the above embodiment, the two-state control state of the power-on state and the power-off state has been described. Of course, the display device control is not limited to two states.
FIG. 3 is a diagram for explaining various controls in the display system 100 and summarizes the commands and the control states of the display device. In FIG. 3, the IR remote controller is a key provided corresponding to each control state change (power on / off, volume change, etc.), and raises or lowers the power on / off command and the volume (volume) of the display device described above. A command, a command to change channel (CH) by +1 or -1 can be supplied to the display system. The IR remote controller is a key provided corresponding to each control state change, and displays a command for setting a time until the power is turned off (Sleep timer command) and a command for switching an input interface (Input Select command). Can be supplied.

Describing a command to increase or decrease (up or down) the volume (volume) of the display device When the volumes of all the display devices are 0, the user presses the volume up key of the IR remote controller. In response to this, the control unit 30 in the display device DISP1 controls the peripheral circuit to perform volume up control, and raises the volume of the display device DISP1 from the volume 0 to the volume 1. In addition, the control unit 30 causes the remote control code output unit 40 to output a third code (a code for shifting the volume of the display device at the next stage to a state in which the volume of the display device at the next stage is increased by the volume 1). The second and subsequent display devices receive the third code indicating the control state (volume 1 up state) in which the previous display device has transitioned from the remote control code input unit 20, and are themselves in the same control state as the previous display device. Transition to (Volume up state). This is executed while sequentially transferring the third code to the last display device, and finally the volumes of all the display devices are increased from volume 0 to volume 1 (all transition to the same control state). .

The display device to which these volume adjustment commands are input is different from the above-described power-on or power-off command, and is not a toggle operation for transitioning the control state of two states, but a control state of three or more states (in increments of volume). The control state transitions between the corresponding control states). However, the display system of the present invention is configured to ensure the same control state between the display devices even when the control state of three or more states is changed.

The Sleep timer command is the same as the volume adjustment command in that the display system transits the control state of three or more states. In the case of the illustration, the display system has five control states (states for controlling the time until power-off) from 0 minutes (no setting) to 120 minutes in 30-minute increments until the transition to the power-off state. The control state transitions.
The same applies to the command for switching the input interface, and the control state of the display system changes between four input interface states of video (Video) input, RGB input, HDMI input, and Display Port input.

As described above, the display system of the present invention does not necessarily ensure the same control state of the display device when the two control states of the power-on or power-off state are changed, but also the number defined by the command ( Even when the control state of n ≧ 3) is changed, it is possible to ensure the same control of the display device.

The display system described above can be applied to an aircraft mounted retract monitor having a liquid crystal display panel, a stadium monitor having a cathode ray tube (CRT), and the like.

DESCRIPTION OF SYMBOLS 100 Display system DISP1, DISP2, DISP3, DISPn, DISPi Display apparatus 10 Remote control code light-receiving part 20 Remote control code input part 30 Control part 40 Remote control code output part

Claims

Each time a code indicating a control state to be transitioned is input, a display device that sequentially transitions between n control states in which the control state is the first to nth (n is a natural number and n ≧ 2) state is cascaded A connected display system comprising:
Of the display devices connected in cascade, the first display device transitions to another control state different from the current control state based on the first code indicating that the current control state should be shifted. The control state is indicated as a control state to which the next-stage display device should transition, and a code different from the first code is output to the subsequent-stage display device,
Other display devices other than the display device in the first stage among the display devices connected in cascade receive the code output from the display device in the previous stage, and display devices based on the control state to which the display device indicated by the code should transition Transitions to the control state and outputs the code to the subsequent display device.
A display system characterized by that.
Each of the column-connected display devices is
A first receiving unit that receives the first code, analyzes the first code, and outputs a first control signal to the control unit indicating that the current control state should be shifted;
Second reception received from the display device in the previous stage, analyzed the second code, and output to the control unit as a second control signal indicating a control state to be changed by the display device And
When a third control signal output by the control unit is input, a transmission unit that outputs a third code indicating a control state that the display device of the next stage should transition;
It is determined which of the first receiving unit and the second receiving unit has received the signal, and the display device is determined based on the first control signal or the second control signal. A control unit that causes a transition to a control state different from the state and instructs the transmission unit to output the third code so that the control state becomes a control state that the next-stage display device should transition to And having
Of the display devices connected in tandem, the first display device receives the first code from the first receiver and outputs the third code to the second receiver of the subsequent display device. And
Of the display devices connected in cascade, the display devices other than the first-stage display device and the last-stage display device are configured such that the second reception unit receives the third code from the transmission unit of the previous display device. And outputting the third code to the second receiving unit at the subsequent stage,
Of the display devices connected in tandem, in the last display device, the second receiving unit receives the third code from the transmission unit of the previous display device as the second code.
The display system according to claim 1.
n = 2, and in the first state and the second state, one is a power-on state and the other is a power-off state.
The display system according to claim 1, wherein the display system is a display system.
An IR remote controller that supplies the first code to the first display device among the cascade-connected display devices when a user inputs a command;
The display system according to claim 1, wherein the display system is a display system.