LED display device and connection method of LED modules

Abstract

An LED module (10-11) and an LED module (10-21) connected at a next stage are provided with: a first path (21A2) that connects a signal processing unit of the LED module (10-11) and a signal processing unit of the LED module (10-21) and supplies a signal including a video signal; a second path (22A2) that is connected to the signal processing unit of the LED module (10-11) and the LED modules following the LED module (10-11), and that supplies a power supply control signal that supplies power from the power supply unit of the LED module to be supplied among the LED modules following the LED module to the signal processing unit of the LED module to be supplied; and a third path (23A2) that connects the power supply unit of the LED module (10-11) and the power supply unit of the LED module (10-21), and that supplies power to the power supply unit of the LED module (10-21), said power being supplied from the outside to the power supply unit of the LED module (10-11).

Description

Technical Field

[0001] This invention relates to LED display devices and LED module connection methods. Background Technology

[0002] There exists an LED display device composed of multiple LED (Light Emitting Diode) modules that displays video based on a video signal. Such an LED display device is connected to a power supply device, from which power is supplied to the LED display device. The power supplied from the power supply device is then supplied to each LED module of the LED display device.

[0003] In lighting devices that include light-emitting elements, there exists a cutting-off circuit that cuts off the power supplied to the light-emitting elements based on control from a control circuit (e.g., Patent Document 1).

[0004] [Existing Technical Documents]

[0005] [Patent Literature]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2022-036630 Summary of the Invention

[0007] [The problem the invention aims to solve]

[0008] However, in LED display devices, even when no video is displayed, the internal circuitry of the LED module operates and consumes power when powered by the power supply device.

[0009] Furthermore, Patent Document 1 is a technology for suppressing the micro-lighting of the light source when it is turned off, not a technology for reducing the power consumption of the LED module.

[0010] [Methods used to solve problems]

[0011] One aspect of the present invention is an LED display device comprising a plurality of LED modules arranged thereon. Each LED module includes: a display section on which a plurality of LED elements are mounted; a signal processing section for displaying video based on a video signal supplied from an external device; and a power supply section for supplying power from the external device to the signal processing section at least. A first LED module and a second LED module connected to the first LED module are provided with: a first path connecting the signal processing section of the first LED module to the signal processing section of the second LED module, supplying a signal including the video signal; a second path connecting the signal processing section of the first LED module to the power supply section of the second LED module, supplying a power control signal for supplying power from the power supply section of the second LED module to the signal processing section of the second LED module; and a third path connecting the power supply section of the first LED module to the power supply section of the second LED module, supplying power supplied from the external device to the power supply section of the second LED module.

[0012] Furthermore, one aspect of the present invention is a method for connecting LED modules, specifically a method for connecting a first LED module among a plurality of LED modules in an LED display device to a second LED module connected at the next level of the first LED module. The LED display device arranges the plurality of LED modules, each LED module comprising: a display unit carrying a plurality of LED elements; a signal processing unit that displays video based on a video signal supplied from an external device; and a power supply unit that supplies power from the external source to at least the signal processing unit. The signal processing unit of the first LED module is connected to the signal processing unit of the second LED module via a first path, through which a signal including the video signal is supplied. The signal processing unit of the first LED module is connected to the power supply unit of the second LED module via a second path, through which a power control signal is supplied for supplying power from the power supply unit of the second LED module to the signal processing unit of the second LED module. The power supply unit of the first LED module is connected to the power supply unit of the second LED module via a third path, through which power supplied from the external source to the power supply unit of the first LED module is supplied to the power supply unit of the second LED module.

[0013] [Invention Effects]

[0014] According to the present invention, power consumption can be reduced when no video is displayed. Attached Figure Description

[0015] Figure 1This is a schematic structural diagram of the display system S, which includes the LED display device of this embodiment.

[0016] Figure 2 This is a schematic structural diagram showing the structure of the LED display device 1.

[0017] Figure 3 This is a side view taken from the side of an LED module 10.

[0018] Figure 4 This is a simplified functional block diagram illustrating the structure of the first LED module and the second LED module.

[0019] Figure 5 This is a functional block diagram illustrating the functions of the power supply section 10d11.

[0020] Figure 6 This is a functional block diagram illustrating the functions of the power supply section 10d11.

[0021] Figure 7 This is a functional block diagram representing the structure of LED module 10-21a.

[0022] Figure 8 This is a diagram illustrating a specific example of the structure of the delay circuit 10e.

[0023] Figure 9 This is a functional block diagram showing the general structure of the signal processing unit 10c11.

[0024] Figure 10 This is a functional block diagram showing the general structure of the signal processing unit 10c11-1.

[0025] Figure 11 This is a simplified functional block diagram illustrating the structure of the output power control signal.

[0026] Figure 12 This is a simplified functional block diagram illustrating another example of the structure of the power control signal output by LED module 10-11.

[0027] Figure 13 This is a schematic functional block diagram representing other structures of the LED module 10.

[0028] Figure 14 This is a diagram illustrating an example of calculating the power consumption of an LED display device. Detailed Implementation

[0029] Hereinafter, an LED display device according to one embodiment of the present invention will be described with reference to the accompanying drawings.

[0030] Figure 1 This is a schematic structural diagram of the display system S, which includes the LED display device of this embodiment.

[0031] The display system S includes an LED display device 1, a power distribution panel 2, a video signal supply device 3, and an LED controller 4.

[0032] LED display device 1 is connected to power distribution panel 2 via a power cord and receives power from power distribution panel 2. In addition, LED display device 1 is connected to LED controller 4 via a communication line.

[0033] The LED display device 1 includes a plurality of LED modules 10. In the LED display device 1, the plurality of LED modules 10 are arranged adjacent to each other in a vertical and horizontal configuration. In this figure, six LED modules 10 are arranged vertically and six are arranged horizontally, for a total of 36 LED modules 10.

[0034] LED display device 1 uses the entire display area of ​​such multiple LED modules to display video based on video signals.

[0035] The distribution panel 2 supplies power to the LED display device 1. The power supplied is, for example, AC (Alternating Current) power.

[0036] The video signal supply device 3 is connected to the LED controller 4 via a communication cable and is the supply source for outputting video signals to the LED controller 4. The specifications of the communication cable connecting the video signal supply device 3 and the LED controller 4 correspond to any of the standards such as DVI I / F or HDMI I / F.

[0037] The video signal supply device 3 can also be, for example, a computer.

[0038] LED controller 4 supplies various signals to the LED module. These signals include video signals and start signals. LED controller 4 is an example of an external device.

[0039] The LED controller 4 outputs the video signal from the video signal supply device 3 to the LED display device 1. For example, the LED controller 4 divides the video signal from the video signal supply device 3 according to the structure in which the LED modules 10 are arranged, converts it into a video signal in a format that can be received at the LED module 10 side, and outputs it to the LED module.

[0040] In addition, the LED controller 4 has a Wake-on-LAN (WOL) function, generating and sending Wake-on-LAN packets representing various signals. These signals sent by the LED controller 4 include, for example, start signals and OFF commands. Start signals can be, for example, WOL (Wake-on-LAN) commands or ON commands. Start signals are control signals that indicate the LED module should be turned on. OFF commands are commands that indicate the video signal should be set to not be displayed.

[0041] Figure 2 This is a schematic structural diagram showing the structure of the LED display device 1.

[0042] In the LED display device 1, there are 6 LED modules 10 arranged vertically and 6 arranged horizontally, for a total of 36 LED modules 10.

[0043] An LED module (e.g., LED module 10-11) is composed of multiple pixel cards 10-0.

[0044] For example, LED module 10-11 is configured at the bottom level (first level) of the leftmost column (first column), and LED modules 10-21, 10-31, 10-41, 10-51 and 10-61 are arranged in sequence above it and connected in series.

[0045] In addition, LED modules 10-12, 10-13, ... are arranged sequentially to the right of LED module 10-11.

[0046] Here, the LED modules 10 in each column are connected in series with the vertically adjacent LED modules 10 via communication cables (e.g., LAN (Local Area Network) cables). Additionally, the primary LED modules 10 in each column are connected to the LED controller 4 via communication cables (e.g., LAN cables). More specifically, LED modules 10-11 are electrically connected to the LED controller 4 via communication cable 21A1, and LED modules 10-12 are electrically connected to the LED controller 4 via communication cable 21B1. Thus, various signals (at least one of a start signal and a video signal) output from the LED controller 4 are supplied to the primary LED modules 10 in each column. The primary LED modules 10 in each column output various signals to the LED modules 10 connected to the next level via communication cables. Thus, various signals (start signal, start signal, etc.) are sequentially transmitted from the primary LED modules 10 in each column to the final LED modules 10.

[0047] Furthermore, adjacent LED modules 10 in the lowest-level column of each LED module 10 are connected to the distribution panel 2 and supplied with AC power. For example, power line 21 connected to the distribution panel 2 is connected to LED modules 10-11 and 10-12. Thus, AC power is supplied from power line 21 to the module group including the first column of LED modules 10-11 and the module group including the second column of LED modules 10-12, respectively.

[0048] Additionally, power line 22, which is connected to distribution panel 2, is connected to LED modules 10-13 and 10-14. Thus, AC power is supplied from power line 22 to module group 10-13G (including LED modules 10-13) and module group 10-14G (including LED modules 10-14) in the third column. Similarly, LED modules 10-15 and 10-16 are connected to distribution panel 2.

[0049] Figure 3 This is a side view taken from the side of an LED module 10.

[0050] In the LED module 10, a display section 10b is formed on the first surface of the LED substrate 10a. The display section 10b has a plurality of LED elements 10e mounted on the first surface of the LED substrate 10a.

[0051] One LED element (10e) constitutes one pixel.

[0052] A signal processing unit 10c and a power supply unit 10d are mounted on the second surface of the LED substrate 10a, which is opposite to the first surface.

[0053] The signal processing unit 10c is connected to the signal processing unit of the LED controller or the LED module of the pre-amplifier, processes the video signal received from the signal processing unit of the LED controller or the LED module of the pre-amplifier, drives the LED elements of the display unit 10b, and displays the video corresponding to the video signal.

[0054] The signal processing unit 10c includes an LED driver IC 10dl and a signal processing module 10mod.

[0055] LED driver IC 10dl is connected to at least one LED element 10ele, and the connected LED element 10ele is lit according to the video signal.

[0056] The signal processing module 10mod performs various signal processing tasks.

[0057] In addition, the signal processing unit 10c is connected to the front-end LED module 10 or LED controller 4, inputs the video signal output from the LED controller 4, and outputs the video signal to the LED module 10 connected to the rear stage in the same column as its own LED module 10.

[0058] If AC power is supplied from the distribution panel 2, the power supply unit 10d converts the AC power into DC power and supplies the converted DC power to each circuit of the LED module.

[0059] In addition, the power supply unit 10d converts the voltage to be suitable for the display unit 10b and the signal processing unit 10c respectively and supplies them.

[0060] Figure 4 This is a schematic functional block diagram illustrating the structure of a first LED module and a second LED module connected at the next level of the first LED module among multiple LED modules 10. Here, for example, the case where the first LED module is LED module 10-11 and the second LED module is LED module 10-21 will be described.

[0061] LED module 10-11 includes a power supply unit 10d11, a signal processing unit 10c11, and a display unit 10b1. Additionally, LED module 10-11 has terminals 21t1, 23t1, 21t2, 22t2, and 23t2.

[0062] LED module 10-21 includes a power supply unit 10d21, a signal processing unit 10c21, and a display unit 10b2. Additionally, LED module 10-21 has terminals 21t3, 22t3, 23t3, 21t4, 22t4, and 23t4.

[0063] Thus, multiple LED modules, including a display section, a signal processing section, and a power supply section, are arranged in the LED display device 1.

[0064] Terminal 23t1 is externally connected to power line 23A from LED module 10-11. The end of power line 23A, different from the end connected to terminal 23t1, is connected to distribution panel 2. Thus, power from distribution panel 2 is supplied to terminal 23t1.

[0065] Terminals 23t1 and 23t2 are connected by a power supply line 23A1. A branch power line from the power supply line 23A1 is connected between the connection point T1 of the power supply line 23A1 and the power supply unit 10d11. Thus, AC power supplied from the distribution panel 2 is supplied to the power supply unit 10d11.

[0066] The power supply unit 10d11 receives AC power from the distribution panel 2 via a power line branching from the power line 23A1, converts the AC power into DC power, and supplies it to the signal processing unit 10c11 via the connecting line 10d1a. The signal processing unit 10c11 can be driven by the power supplied via the connecting line 10d1a.

[0067] Here, the power supply unit 10d11 is provided with a switching unit (described later) for switching whether to supply power to the signal processing unit 10c11. In this figure, for the switching unit of the power supply unit 10d11 of the primary LED module 10 which is supplied with AC power, an on signal supply unit 10d1-1 is provided for supplying an on signal for switching to supplying power to the signal processing unit 10c. Therefore, the power supply unit 10d11 supplies DC power to the signal processing unit 10c11 according to the AC power supplied from the power line 23A1.

[0068] Terminals 23t2 and 23t3 are connected via a third path 23A2. Thus, the power line between terminals 23t1 and 23t2 of LED module 10-11 and the power line between terminals 23t3 and 23t4 of LED module 10-21 are electrically connected. A power supply unit 10d11 is connected to the power line between terminals 23t1 and 23t2 of LED module 10-11. A power supply unit 10d21 is connected to the power line between terminals 23t3 and 23t4 of LED module 10-21. The third path is, for example, a power line capable of supplying AC power.

[0069] That is, the third path is the path connecting the power supply section of the first LED module and the power supply section of the second LED module, and supplies the power supplied from the outside to the power supply section of the second LED module to the power supply section of the first LED module.

[0070] For example, the third path 23A2 connects the power supply section 10d11 of LED module 10-11 to the power supply section 10d2 of LED module 10-21, and supplies the power supplied from the distribution panel 2 to LED module 10-11 to the power supply section 10d2.

[0071] The third path 23A3 connects the power supply section 10d21 of LED module 10-21 to the power supply section of LED module 10-31, which is connected to the next level of LED module 10-21, and supplies power from the distribution panel 2 to the power supply section.

[0072] The third path can be, for example, a power line that can supply electricity. In addition, the third path can be any path that can supply electricity; for example, it can also be a cable consisting of three wires: live wire, neutral wire, and ground wire.

[0073] The third path will be described as a path that connects the terminals of the LED module to the terminals of the next-level LED module 10. However, it may also be a path that connects the power supply section of the LED module to the power supply section of the next-level LED module 10.

[0074] Terminal 21t1 of LED module 10-11 is externally connected to communication cable 21A1. The end of communication cable 21A1, different from the end connected to terminal 23t1, is connected to LED controller 4. Thus, a start signal (Wake-on-LAN packet) from LED controller 4 is supplied to terminal 21t1.

[0075] When the signal processing unit 10c11 receives a start signal from the LED controller 4, it generates a power control signal and supplies it to the power supply unit 10d2 of the LED module 10-21 connected to the next stage via the second path 22A2. Here, the LED controller 4 sets the start signal as a Wake-on-LAN packet and sends it to the signal processing unit 10c11 of the LED module 10-21. By sending this signal to the next stage LED module 10 via the second path, the signal processing unit 10c11 can turn on the power supply unit of that LED module 10.

[0076] In addition, the use of the Wake-on-LAN packet as a start signal is explained. However, as long as the power can be turned on, the Wake-on-LAN packet can be omitted, and a separate turn-on command predetermined between the LED controller 4 and the signal processing unit 10c11 can be used instead.

[0077] The power control signal can be any signal that can supply power from the power supply unit 10d2 to the signal processing unit 10c2.

[0078] The first connection line of the signal processing unit 10c11 is connected to the terminal 22t2.

[0079] Terminals 22t2 and 22t3 are communicatively connected via a second path 22A2.

[0080] That is, the second path is a path that connects to the signal processing unit of the first LED module and the next-level LED module of the first LED module, and supplies a power control signal, which causes the power supply unit of the LED module to be supplied to supply power to the signal processing unit of the LED module to be supplied.

[0081] For example, the second path 22A2 connects the signal processing unit 10c11 of the LED module 10-11 to the power supply unit 10d2 of the LED module 10-21, and supplies the power control signal supplied from the signal processing unit 10c11 to the power supply unit 10d2.

[0082] The second path 22A3 is a path that supplies the power control signal output from the signal processing unit 10c11 of LED module 10-11 to the power supply unit of LED module 10-31, which is connected to the next stage of LED module 10-21. Here, in LED module 10-21, an electrically connected supply path 22A21 is provided between terminals 22t3 and 22t4, and the power control signal supplied from the signal processing unit 10c11 is supplied to the next stage LED module 10-31 via the second path 22A3.

[0083] The second path will be described as a path that connects the terminals of the LED module to the terminals of the next-level LED module 10. However, it could also be a path that connects the signal processing unit of the LED module to the power supply unit of the next-level LED module 10.

[0084] The second path simply needs to be a path connecting the signal processing unit of the first LED module and the next-level LED module after the first LED module. In this case, the next-level LED module can also be an LED module adjacent to the first LED module. Alternatively, the next-level LED module can also be an LED module arranged in a plurality of LED modules that is not adjacent to the first LED module (e.g., a third-level LED module, a fourth-level LED module, etc. in the same column as the first LED module).

[0085] The second path A2 and the second path A3 are, for example, signal lines capable of transmitting power control signals. The second path A2 and the second path A3 can be any path capable of transmitting power control signals; for example, they can also be a pair of cables consisting of a line representing a high level (HI) or a low level (LOW) and a ground line.

[0086] After starting the LED module 10-11, if the LED module 10-11 is then disconnected (stopped), a separate disconnection command can be pre-set between the LED controller 4 and the signal processing unit 10c11, and this disconnection command can be used. For example, when the signal processing unit 10c11 receives a disconnection command from the LED controller 4, it generates a power control signal including an instruction to stop the power supply, and sends it to the power supply unit 10d2 of the subsequent LED module 10-12 via a second path. As a result, the power supply unit 10d2 stops operating upon receiving the power control signal including the instruction to stop the power supply, and also stops supplying power to the signal processing unit 10c2.

[0087] The second connection line of the signal processing unit 10c11 is connected to the terminal 21t2.

[0088] Terminal 21t2 and terminal 21t3 are communicatively connected via the first path 21A2.

[0089] That is, the first path is the path connecting the signal processing unit of the first LED module and the signal processing unit of the second LED module, supplying signals including video signals.

[0090] The first path is, for example, a communication cable. As a communication cable, a LAN cable can be used, for example.

[0091] The first path 21A2 connects the signal processing unit 10c11 of LED module 10-11 to the signal processing unit 10c2 of LED module 10-21, supplying at least one of a video signal and a start signal to the signal processing unit 10c2. Additionally, the first path 21A3 connects the signal processing unit 10c2 of LED module 10-21 to the signal processing unit of LED module 10-22, supplying at least one of a video signal and a start signal to the signal processing unit 10c2. Thus, the first path connects the signal processing units of adjacent LED modules 10 in each column, supplying various signals.

[0092] The first path will be described as a path that connects the terminals of the LED module to the terminals of the next-level LED module 10. However, it could also be a path that connects the signal processing unit of the LED module to the signal processing unit of the next-level LED module 10.

[0093] In this way, the first path connects the signal processing units of adjacent LED modules 10 in each column.

[0094] When the signal processing unit 10c11 receives the start signal from the LED controller 4, it sends the start signal to the signal processing unit 10c2 of the subsequent LED module 10-21 via the first path 21A2.

[0095] The third connection line 10c11a of the signal processing unit 10c11 is connected to the display unit 10b1.

[0096] In addition, when the signal processing unit 10c11 is powered by the power supply unit 10d11, it supplies power to the display unit 10b1 via the connection line 10c11a.

[0097] LED module 10-21 includes a power supply unit 10d2, a signal processing unit 10c2, and a display unit 10b2. LED module 10-21 includes terminals 21t3, 22t3, 23t3, 21t4, 22t4, and 23t4.

[0098] Here, LED module 10-21 has a supply path 22A21 that supplies power control signals to the signal processing unit of a third LED module (e.g., LED module 10-31) connected to the next level of LED module 10-21.

[0099] Supply path 22A21 is connected between terminal 22t3 and terminal 22t4, supplying power control signals to the second path 22A3.

[0100] Figure 5 This is a functional block diagram illustrating the functions of the power supply section 10d11.

[0101] The power supply unit 10d11 includes an AC-DC conversion unit 10d11a and a switching unit 10d11b.

[0102] The AC-DC converter 10d11a converts externally supplied AC power into DC power and outputs it.

[0103] The switching unit 10d11b receives a power control signal and switches whether to supply DC power to the subsequent stage (signal processing unit) depending on whether the power control signal is on or off. For example, when the power control signal indicates that it is on, the switching unit 10d11b switches to on and supplies DC power output from the AC-DC converter 10d11a to the subsequent stage (signal processing unit). When the power control signal indicates that it is off, the switching unit 10d11b switches to off and cuts off the power supply from the AC-DC converter 10d11a to the subsequent stage (signal processing unit).

[0104] According to the structure of the power supply unit 10d11 in the figure, the power supplied from the AC-DC converter 10d11a to the signal processing unit can be cut off according to the power control signal. Therefore, without driving the LED module 10, the power supplied to the signal processing unit and the display unit can be stopped, thereby reducing the power consumption of the LED module.

[0105] Figure 6 This is a functional block diagram illustrating the functions of the power supply section 10d11.

[0106] The power supply unit 10d11 has a relay control circuit 10d11c and an AC relay 10d11d.

[0107] The AC-DC converter 10d11a converts externally supplied AC power into DC power and outputs it.

[0108] The relay control circuit 10d11c drives the AC relay based on an externally input relay control signal. For example, the relay control circuit 10d11c switches whether the AC relay 10d11d is on or off depending on whether the relay control signal is on or off. For instance, when the relay control signal indicates on, the relay control circuit 10d11c switches the AC relay 10d11d to on, supplying externally supplied AC power to the AC-DC converter 10d11a. When the relay control signal indicates off, the relay control circuit 10d11c switches the AC relay 10d11d to off, cutting off the AC power supplied to the AC-DC converter 10d11a.

[0109] The AC relay is connected between the AC power supply and the AC-DC converter 10d11a, and switches to either on or off state according to the instruction of the relay control circuit 10d11c.

[0110] Here, the relay control signal can be the power control signal input from the signal processing unit of the preceding LED module 10.

[0111] Based on the structure of the power supply unit 10d11 in the figure, the power supplied to the AC-DC converter unit 10d11a can be cut off based on a relay control signal before the input to the AC-DC converter unit 10d11a. At this time, without supplying power to the signal processing unit, the drive of the AC-DC converter unit 10d11a can be stopped, and the power consumption of the AC-DC converter unit 10d11a can also be reduced.

[0112] Furthermore, by using the AC relay 10d11d, the power supply and disconnection are switched between the AC power supply path and the AC-DC converter 10d11a. Therefore, it is not necessary to disconnect the power on the third path supplying AC power between the LED modules. Thus, a large current-capacity disconnection circuit would be required to disconnect power on the third path, but since power can be disconnected only on the AC-DC converter 10d11a, a small current-capacity disconnection circuit can be used.

[0113] Figure 7This is a functional block diagram showing the structure of LED module 10-21a, which is connected to LED modules 10-21 at the second level and beyond. Each LED module at the second level and beyond can have the structure shown in LED module 10-21a, or at least one LED module in a column can have the structure of LED module 10-21a.

[0114] For LED module 10-21a and Figure 4 The LED modules 10-21 have the same structure and are labeled with the same reference numerals, and their descriptions are omitted.

[0115] LED module 10-21a has a delay circuit 10e.

[0116] The delay circuit 10e is connected between terminal 22t3 and power supply section 10d2.

[0117] Delay circuit 10e causes the first LED module (e.g., Figure 4 The time delay at which the power control signal supplied by the LED module 10-11 reaches the power supply section (power supply section 10d2 in the figure) of the second LED module (e.g., LED module 10-21a).

[0118] Here, LED module 10-21a has a supply path 22A21 that supplies power control signals to the signal processing unit of a third LED module (e.g., LED module 10-31) connected at the next level of LED module 10-21a.

[0119] Supply path 22A21 is connected between terminal 22t3 and terminal 22t4, and supplies power control signals that are input to delay circuit 10e or delayed by delay circuit 10e via second path 22A3.

[0120] The delay time set in the delay circuit 10e can be set to any time.

[0121] The delay circuit 10e delays the timing of the power control signal input to the power supply unit compared to the startup timing of the power supply unit in the preceding LED module based on the power control signal. Therefore, the startup times of the power supply units in multiple LED modules in the same row can be different, reducing the inrush current in the LED display device 1.

[0122] Figure 8 It means Figure 7 A diagram showing a specific example of the structure of the delay circuit 10e in the diagram.

[0123] The first terminal of capacitor C1 is connected to the input terminal Tin, and the second terminal, which serves as another terminal, is connected to the delay time setting unit TD. The electrostatic capacitance of capacitor C1 can also be determined according to the delay time.

[0124] The delay time setting unit TD sets the delay time. The delay time setting unit TD includes multiple resistors and multiple switches. For example, it includes multiple setting units Ut connected in series with one resistor Rt and one switch SWt. These multiple setting units Ut are connected in parallel between the second terminal of capacitor C1 and the ground connection point.

[0125] The resistance values ​​of multiple resistors Rt can be different or the same. Multiple switches SWt are physical switches that can be switched on and off based on operator input. Therefore, the delay time can be set based on the combination of the on / off state of each switch SWt and the resistance value of the resistor Rt connected to the on switch.

[0126] The first terminal of resistor R11 is connected to the input terminal Tin, and the second terminal, which serves as another terminal, is connected to the first terminal of resistor R12.

[0127] The first terminal of resistor R12 is connected to the second terminal of resistor R11, and the second terminal of the other terminal is grounded.

[0128] When a power control signal is applied to terminal Tin, the voltage at the connection point between resistors R11 and R12 remains approximately constant.

[0129] The voltage to be applied to the second input terminal of the operational amplifier OP can be set according to the combination of the resistance values ​​of resistor R11 and resistor R12.

[0130] The first input terminal of the operational amplifier OP is connected to the connection point between capacitor C1 and delay time setting unit TD.

[0131] The second input terminal of the operational amplifier OP is connected to the junction between resistors R11 and R12.

[0132] The positive power supply terminal of the operational amplifier is connected to the input terminal Tin, and the negative power supply terminal is grounded.

[0133] The operational amplifier (OP) compares the voltage input from the first input terminal with the voltage input from the second input terminal. If the voltage input from the first input terminal is higher than the voltage input from the second input terminal, the OP outputs a power control signal from the output terminal. If the voltage input from the first input terminal is lower than the voltage input from the second input terminal, the OP does not output a power control signal from the output terminal.

[0134] For example, when a power control signal is input to the delay circuit 10e, the voltage at the connection point between capacitor C1 and the delay time setting unit TD rises according to the combined resistor set in the delay time setting unit TD and the electrostatic capacitance of capacitor C1. When the voltage at the connection point between capacitor C1 and the delay time setting unit TD exceeds the voltage at the connection point between resistors R11 and R12, the operational amplifier OP connects the power control signal to the external circuit. Here, the time from when the power control signal is supplied to terminal Tin and output from terminal Tout can be changed according to the on or off state of each of the multiple switches SWt.

[0135] Here, a unique delay time can be set for the LED module equipped with the delay circuit 10e based on the combination of the on and off states of the multiple switches SWt of the delay time setting unit TD. Here, by making the delay times of the delay time setting units TD in the multiple LED modules different, the start-up times of the power supply units of each LED module can be made different. Here, if the start-up times of the power supply units of each LED module are the same, inrush current is easily generated in the LED display device 1 when power is supplied. However, according to this embodiment, even when power is supplied to the LED display device 1, because the start-up times of the power supply units of each LED module are different, the times at which inrush current is generated in each LED module can be staggered, thus reducing the value of the inrush current generated in the LED display device 1 as a whole.

[0136] Figure 9 It means Figure 4 Functional block diagram of the schematic structure of the signal processing unit 10c11 in the middle.

[0137] In the signal processing unit 10c11, the first connector 101 is, for example, a socket into which an RJ-45 connector can be inserted. The communication cable 21A1 is connected to the first connector 101.

[0138] The pulse transformer 102 is connected to the first connector 101 and to the PHY (Ethernet Physical Layer Transceiver) device 103.

[0139] The pulse transformer 102 has a primary winding and a secondary winding, and receives various signals (start signal, video signal, etc.) from the outside (LED controller 4) via the first connector 101. The pulse transformer 102 supplies various signals to the PHY device 103 via the primary and secondary windings. By outputting various signals to the subsequent stage via the primary and secondary windings, the pulse transformer 102 blocks the intrusion of high voltages and the like input from the first connector 101, thus protecting the device from the transmission of high voltages and the like into the internal components.

[0140] PHY device 103 is connected to pulse transformer 102, CPU (Central Processing Unit) 104, PHY device 106 and EtherMAC (Media Access Controller) 107.

[0141] PHY device 103 receives Ethernet signals via a pulse transformer. These Ethernet signals include various signals, such as activation signals and video signals. PHY device 103 converts the analog signals supplied from pulse transformer 102 into digital signals and outputs them to CPU 104, PHY device 106, and EtherMAC 107.

[0142] PHY device 103 has circuitry that detects whether a start signal (e.g., a WOL instruction) is included among various signals input from pulse transformer 102. When a start signal (e.g., a WOL instruction) is detected, PHY device 103 generates an interrupt signal and outputs the generated interrupt signal to CPU 104.

[0143] PHY device 103 outputs the video signal of the object displayed in the LED module where this PHY device 103 is installed, which is part of the video signal included in the Ethernet signal, to EtherMAC 107, and supplies the video signal of the object not displayed in the LED module where this PHY device 103 is installed (the video signal displayed by the subsequent LED module 10) to PHY device 106.

[0144] CPU 104 is connected to PHY device 103, buffer circuit 105, and video / control data signal processing unit 108.

[0145] When the CPU 104 receives an interrupt signal based on a start signal (e.g., a WOL instruction) from the PHY device 103, it determines that it has obtained a start instruction from the LED controller 4, generates a power control signal, and outputs the generated power control signal to the buffer circuit 105.

[0146] In addition, the CPU 104 obtains a disconnect command from the video and control data signal processing unit 108. Upon obtaining the disconnect command, the CPU 104 outputs a power control signal for disconnecting the power supply to the buffer circuit 105.

[0147] The buffer circuit 105 is connected to the CPU 104 and terminal 22t2. Terminal 22t2 is connected to the second path 22A2. Thus, the buffer circuit 105 can transmit power control signals to the LED module connected in the next stage via the second path 22A2.

[0148] Here, in the stage where no start signal is input, in order to detect whether a start signal is input and generate a power control signal, the PHY device 103 and CPU 104 wait for the start signal while powered by the power supplied from the power supply unit.

[0149] PHY device 106 is connected to PHY device 103 and pulse transformer 109. PHY 106 outputs the video signal supplied from PHY device 103 to pulse transformer 109.

[0150] The pulse transformer 109 is connected to the PHY device 106 and the second connector 110.

[0151] The pulse transformer 109 has a primary winding and a secondary winding, which supply the video signal input from the PHY device 106 to the second connector 110. By outputting the video signal to the subsequent stage through the primary and secondary windings, the pulse transformer 109 can prevent high voltages from being transmitted to the subsequent stage.

[0152] The second connector 110 is connected to the pulse transformer 109 and the terminal 21t2. The terminal 21t2 is connected to the first path 21A2. Thus, the second connector 110 can transmit video signals to the LED module connected in the next stage via the first path 21A2.

[0153] The EtherMAC 107 is connected to the PHY device 103 and the video and control data signal processing unit 108. The EtherMAC 107 obtains the video signal of the object displayed in the LED module where it is installed from the PHY device 103 and supplies it to the video and control data signal processing unit 108.

[0154] The video control data signal processing unit 108 is connected to the EtherMAC 107, CPU 104, and display unit.

[0155] The video control data signal processing unit 108 drives the LEDs of the display unit based on the video signal supplied from the EtherMAC 107, thereby causing the display unit 10b1 to display video based on the video signal.

[0156] If the video signal supplied from the EtherMAC 107 includes a disconnect command, the video control data signal processing unit 108 supplies a disconnect command to the CPU 104. Additionally, if the video signal supplied from the EtherMAC 107 includes a disconnect command, the video control data signal processing unit 108 prevents the display unit 10b1 from displaying video based on the video signal.

[0157] Here, the case where the WOL instruction is used as the start signal will be explained, but the start signal may also be an on instruction instead of the WOL instruction. In this case, the WOL instruction is not detected in the PHY device 103, but when the video / control data signal processing unit 108 detects that the video signal supplied from the EtherMAC 107 includes an on instruction, it supplies an on instruction to the CPU 104. Therefore, the CPU 104 generates a power control signal based on the on instruction. In addition, when the video / control data signal processing unit 108 detects the video signal supplied from the EtherMAC 107, it causes the display unit 10b1 to display video based on the video signal.

[0158] In the above embodiments, for in Figure 9 In the signal processing unit 10c11 shown, the PHY device 103 and CPU 104 are described in a state where they are powered on by the power supplied from the power supply unit and are waiting for a start signal.

[0159] Figure 10 This is a functional block diagram showing the general structure of the signal processing unit 10c11-1, which represents other structures of the signal processing unit 10c11 as described above.

[0160] In the signal processing unit 10c11-1, the same reference numerals are used for structures that are identical to those in the signal processing unit 10c11, and their descriptions are omitted.

[0161] The standby power supply unit 115 is connected to the power supply unit 10d11 and the PHY device 103a, and supplies power from the power supply unit 10d11 to the PHY device 103a. The standby power supply unit 115 supplies standby power to the PHY device 103a and the CPU 104a to maintain the standby state.

[0162] PHY device 103a is connected to standby power supply unit 115, pulse transformer 102, PHY device 106, EtherMAC 107, and CPU 104a.

[0163] The PHY device 103a is driven by standby power supplied from the standby power supply unit 115 before a start signal is input from the LED controller 4, and has a detection unit for detecting whether a start signal has been input. The PHY device 103a transitions to a standby state before a start signal is input from the LED controller 4. When no start signal is input, the PHY device 103a does not output a signal indicating that a start signal has been input to the CPU 104a. On the other hand, when a start signal is detected, the PHY device 103a outputs a signal indicating that a start signal has been detected to the CPU 104a and transitions to a normal state.

[0164] CPU 104a is connected to PHY device 103a, buffer circuit 105, video and control data signal processing unit 108, and main power supply unit 116.

[0165] CPU 104a has a control unit that is driven by power supplied from standby power supply unit 115. The control unit stops the drive of power supply unit 10d11 before a start signal is detected by PHY device 103a, and when a start signal is detected by PHY device 103a, the control unit enables the drive of power supply unit 10d11 to start.

[0166] When no startup signal is detected in the PHY device 103a, the CPU 104a stops the main power supply unit 116 and switches to standby mode. When a signal indicating that a startup signal has been detected is received from the PHY device 103a, the CPU 104a starts the main power supply unit 116 and switches to normal mode.

[0167] Furthermore, when no start signal is input (or a disconnect command is input), the CPU 104a is driven in standby mode by receiving power from the PHY device 103a or the standby power supply unit 115. Here, the PHY device 103a supplies power to the CPU 104a from the standby power supply unit 115. However, if the CPU 104a can directly receive power from the standby power supply unit 115, the PHY device 103a may not supply power to the CPU 104a.

[0168] The main power supply unit 116 is connected to the power supply unit 10d11, the CPU 104a, and the signal processing unit 10c11-1. The main power supply unit 116 can switch between supplying power to the signal processing unit 10c11-1 based on an instruction from the CPU 104a. If an instruction to supply power is received from the CPU 104a, the main power supply unit 116 supplies power from the power supply unit 10d11 to the signal processing unit 10c11-1. As a result, the signal processing unit 10c11-1 is switched to an drivable state.

[0169] Here, when no start signal is input to the signal processing unit 10c11-1, power sufficient to maintain the standby state is supplied from the standby power supply unit 115 to the PHY device 103a. Therefore, before a start signal is detected, the PHY 103a and CPU 104a transition to standby mode. Thus, before a start signal is detected, the entire signal processing unit 10c11-1 is not activated, and only power sufficient for the PHY 103a and CPU 104a to operate is supplied, thereby achieving power saving for the LED modules at the beginning of the column of the LED display device 1 (the LED modules connected to the LED controller 4).

[0170] According to this embodiment, by configuring the power supply to be divided into a standby power supply unit 115 and a main power supply unit 116, the CPU 104a can stop the main power supply and limit the power supply to other circuits before the PHY 103a detects a start signal (WOL instruction, etc.). This achieves power saving.

[0171] Next, an example of the structure of the signal processing unit 10c11 outputting a power control signal to the adjacent LED module 10 will be described.

[0172] Figure 11 This is a simplified functional block diagram illustrating the structure of the output power supply control signal. In this diagram, [the following is a description of the signal structure]. Figure 9 The peripheral structure of the CPU 104 of the signal processing unit 10c11 is described, but the illustrations of other structures such as the PHY device 103 are omitted.

[0173] In addition, the LED modules 10-11 shown in the figure are structures that can be applied to the first-level LED modules 10 in each column.

[0174] The buffer circuit 105 of LED module 10-11 is connected to CPU 104 and switch 122. The buffer circuit 105 supplies the power control signal from CPU 104 to switch 122 in a way that reduces the output impedance.

[0175] The power control signal input terminal 121 is connected to the first input terminal of the switch 122 and can be connected to the supply path of the power control signal supplied from the outside. The power control signal input terminal 121 of the LED module 10-11 is not connected to the supply path of the power control signal.

[0176] The first input terminal of the switch 122 of the LED module 10-11 is connected to the power control signal input terminal 121, and the second input terminal is connected to the output terminal of the buffer circuit 105. Either the first input terminal or the second input terminal can be selected for connection. In addition, the output of the switch 122 is connected to the vertical output terminal 123 and the horizontal output terminal 124.

[0177] Therefore, switch 122 supplies power control signals via the selected terminal of the first input terminal and the second input terminal to the vertical output terminal 123 and the horizontal output terminal 124, respectively. The connection to either the first input terminal or the second input terminal can be manually switched using a physical switch.

[0178] Switch 122 supplies signals input from a selected terminal among the first and second input terminals to the vertical output terminal 123 and the horizontal output terminal 124. For the primary LED module of each column, switch 122 is configured to connect to the second input terminal (buffer circuit 105). For the LED modules of the second and subsequent stages in each column, switch 122 is configured to connect to the power control signal input terminal. Furthermore, nothing is connected to the power control signal input terminal 121 of LED modules 10-11.

[0179] The vertical output terminal 123 is connected to the power control signal input terminal 121 of the next-level LED module 10-21 in the same column via the second path 22A2. That is, the vertical output terminal 123 can be connected to the signal processing unit of the subsequent LED module arranged in the column direction via the second path.

[0180] Therefore, the power control signal supplied from the buffer circuit 105 of LED module 10-11 is supplied to the switch 122 of LED module 10-21 via the second path 22A2 connected to the longitudinal output terminal 123 and the power control signal input terminal 121 of LED module 10-21. Thus, the structure of the signal processing unit of each LED module (LED module 10-11 in the primary stage and LED modules in the second and subsequent stages (LED module 10-21, LED module 10-31, etc.) can be generalized, and the supply path of the power control signal for each LED module (LED module 10-21, LED module 10-31, etc.) in the primary and subsequent stages can be selected by switching the switch 122.

[0181] The horizontal output terminal 124 is a terminal that can be connected via the fourth path 24A1 to the power control signal input terminal 121 of the LED module 10-12, which is arranged in the same row and adjacent column (in this example, the right side) in the row direction.

[0182] The second input terminal of the switch 122 of the signal processing unit 10c12 is connected to the output of the buffer circuit 105 of the LED module 10-11. Here, the switch 122 of the signal processing unit 10c12 is selected to be connected to the first input terminal, and therefore, it is selected to input a power control signal supplied from the signal processing unit 10c11 located adjacent to it on the left. Therefore, the switch 122 supplies the power control signal to the vertical output terminal 123 and the horizontal output terminal 124 of the signal processing unit 10c12. The horizontal output terminal 124 of the signal processing unit 10c12 is connected to the power control signal input terminal of the LED module 13 located adjacent to it on the right. Thus, the power control signal is supplied to the primary LED module in the adjacent column.

[0183] The power control signal input terminal 121 of LED modules 10-12 is connected via a second path to the horizontal output terminal 124 of the adjacent LED module 10-11 on the left, and is also connected to the first input terminal of switch 122. Switch 122 of LED modules 10-12 is switched to connect to the power control signal input terminal 121 side. Subsequently, the adjacent LED modules on the right in each column of primary LED modules are also connected in the same way, and switch 122 is switched to the power control signal input terminal 121 side. Furthermore, regarding the rightmost LED module in the LED display device 1, since there is no LED module connected to the right side of the horizontal output terminal 124, it is not connected to the next LED module.

[0184] The vertical output terminal 123 of LED modules 10-21 is connected to the signal processing unit of the next-level LED module, but the horizontal output terminal 124 is not connected to the adjacent LED module on the right. That is, the horizontal output terminal 124 of the LED module that is later than the second level is not connected to the LED module adjacent to the right. In addition, there is no next-level LED module on the vertical output terminal 123 of the last level of each column, so it is not connected to the next-level LED module.

[0185] Additionally, to protect the buffer circuit 105, a current protection circuit can be connected when connecting the buffer circuit 105 and the switch 122. Simply put, a resettable fuse (using a PTC (Positive Temperature Coefficient) thermistor made of conductive polymer) can also be used.

[0186] According to this embodiment, by pre-setting the signal path after the buffer circuit 105 using the switch 122, it is possible to switch whether the power control signal is received from the LED module connected in the previous stage (or row) or from the CPU of the LED module itself. Therefore, the power control signal output from the CPU 104 of one LED module can be used not only within the LED module itself, but also supplied to other LED modules. This allows for the standardization of the structure of LED modules from the first stage to the second stage and beyond. Furthermore, since the CPU 104 of the LED modules from the second stage and beyond does not need to generate power control signals, power consumption can be reduced.

[0187] According to this embodiment, LED modules 10-11 and 10-21 are arranged adjacent to each other, and LED module 10-12, which is the next level in a different series from LED module 10-21, is arranged adjacent to LED module 10-11. LED module 10-11 is also provided with a fourth path 24A1, which is connected to the power supply section of LED module 10-12 and supplies a power control signal. This power control signal causes power to be supplied from the power supply section of LED module 10-12 to its signal processing section. By providing the fourth path 24A1, power control signals can be supplied to LED modules in the column following the LED module that generates the power control signal, and also to LED modules in columns adjacent to the LED module that generates the power control signal. Therefore, it is not necessary to provide one LED module generating a power control signal in each column.

[0188] In this embodiment, the case of connecting to the upper LED module in the column direction and the right-adjacent LED module in the row direction of LED module 10-11 is described. However, it is also possible to connect three or more LED modules to one LED module. For example, it is also possible to connect to three or four LED modules from the upper and lower LED modules in the column direction and the right and left LED modules in the row direction of one LED module. In this case, the number can be increased depending on the number of LED modules to which the vertical output terminal 123 and the horizontal output terminal 124 are connected.

[0189] Next, another example of the structure in which LED modules 10-11 output power control signals to adjacent LED modules 10 will be described.

[0190] Figure 12 This is a schematic functional block diagram illustrating another example of the structure of the power control signal output by LED module 10-11. In this diagram, for Figure 9 Other examples of the peripheral structure of the CPU 104 in the LED modules 10-11 will be described, but illustrations of other structures such as the PHY device 103 are omitted. Additionally, regarding... Figure 11 The same structures are labeled with the same reference numerals, and their descriptions are omitted.

[0191] In LED module 10-11-2, the input terminal of diode 141 is connected to the power supply Vcc of signal processing unit 10c-2, and the output terminal is connected to connection point 142.

[0192] The positive power supply terminal of the buffer circuit 105 is connected to the connection point 142. The buffer circuit 105 can be driven by power supplied from the power supply Vcc.

[0193] The horizontal power supply terminal 125 is connected to the connection point 142, and is also connected to the connection point 142 of the signal processing unit 10c12-2 of the LED module arranged adjacent to it on the right.

[0194] Switch 132 is connected between CPU 104 and buffer circuit 105. More specifically, the first input terminal of switch 132 is connected to power control signal input terminal 131, and the second input terminal is connected to the output terminal of CPU 104. The output terminal of switch 132 is connected to the input terminal of buffer circuit 105. The connection to either the first or second input terminal can be manually switched using a physical switch. In this case, switch 132 of signal processing unit 10c11-2 is switched to connect to the second input terminal.

[0195] The power control signal input terminal 131 of the LED module 10-12-2 is connected to the horizontal output terminal 124 of the signal processing unit 10c11-2 via the second path 25A1. The switch 132 of the signal processing unit 10c12-2 is switched to connect to the first input terminal.

[0196] Furthermore, the positive power terminal of the buffer circuit 105 of LED module 10-12-2 is connected to the connection point 142 of LED module 10-12-2. The buffer circuit 105 of LED module 10-12-2 can be driven by the voltage supplied from the connection point 142, and supplies the power control signal input via the power control signal input terminal 131 and via the lateral output terminal 124 of the adjacent LED module 10-11-2 to the second input terminal of the switch 122 connected to the subsequent stage. Thus, even if LED module 10-12-2 does not generate the power control signal through the CPU 104 provided in LED module 10-12-2, it can obtain it from the adjacent LED module 10-11-2.

[0197] Furthermore, according to this embodiment, a buffer circuit 105 can be configured to supply power from LED module 10-11-2 (the primary LED module in the column) to the next LED module (the LED module connected to the next stage in the column, and the LED module connected to the right side adjacently) when the input impedance of the LED module connected to the vertical output terminal 123 and the horizontal output terminal 124 is low.

[0198] Here, although the LED module adjacent to the LED module activated by the power supply also depends on impedance, even when the power supply is off, sometimes it cannot operate solely with the control signal supplied from the buffer of the preceding stage (or the horizontally adjacent LED module). Even in such cases, it is possible to supply power from the preceding stage (or the horizontally adjacent LED module) to the next stage (or the horizontally adjacent LED module) for driving. Here, power can be supplied to the adjacent LED module via the horizontal power supply terminal 125.

[0199] Furthermore, the standby power of the signal processing unit described in this embodiment can be supplied from other LED modules, and the startup based on track signals (WOL commands, etc.) can be performed for each column, which can also suppress the overall power consumption of the LED display.

[0200] In addition, according to this structure, in order to prevent current leakage to circuits other than the buffer circuit 105, power can be supplied from the power supply Vcc via diode 141.

[0201] then, Figure 13 This is a schematic functional block diagram showing other structures of the LED module 10. In this diagram, for... Figure 4 Other structural examples of LED modules 10-11 and 10-21 will be described. Additionally, in LED module 10-11b, [the following is a description of the related structures]. Figure 4 The LED modules 10-11 have the same structure and are labeled with the same reference numerals, and their descriptions are omitted. Additionally, in LED module 10-21b, the same reference numerals are used for... Figure 4 The LED modules 10-21 have the same structure and are labeled with the same reference numerals, and their descriptions are omitted.

[0202] LED module 10-11b includes a power supply unit 10d11-2, a signal processing unit 10c11-2, a power cut-off circuit 10f11, and a display unit 10b1. Additionally, LED module 10-11b is provided with terminals 21t2, 22t2, and 23t2.

[0203] The power supply unit 10d11-2 converts externally supplied AC power to DC power and outputs it to the signal processing unit 10c11-2. Here, the power supply unit 10d11-2 is not equipped with... Figure 6 The switch section 10d11b shown Figure 7 The AC relay d11d and relay control circuit 10d11c shown are circuits that are turned on and off based on power control signals.

[0204] The signal processing unit 10c11-2 has Figure 10The functions of the signal processing unit 10c11-1, the standby power supply unit 115, and the main power supply unit 116 shown are illustrated.

[0205] Regarding the signal processing unit 10c11-2, when a Wake-on-LAN packet (start signal) is received from the LED controller 4, the PHY device (103) and CPU (104) in the signal processing unit 10c11-2 switch from standby state to normal state.

[0206] When the signal processing unit 10c11-2 switches to the normal state, it generates a power control signal to turn on the power cut-off circuit 10f11 and supply power from the power cut-off circuit 10f11 to the display unit 10b1.

[0207] In addition, when generating a power control signal, the signal processing unit 10c11-2 supplies the power control signal to the signal processing unit 10c21-2 of the next-level LED module 10-21b in the same column via the second path 22A2, and also supplies it to the power cut-off circuit 10f11.

[0208] When transitioning from the normal state to the standby state, a separate disconnection command is preset between the LED controller 4 and the signal processing unit 10c11-2. The signal processing unit 10c11-2 obtains the disconnection command from the LED controller 4, thereby transitioning to the standby state.

[0209] After receiving a disconnect command from the LED controller, the signal processing unit 10c11-2 generates a power control signal for cutting off the power supply and outputs it to the power cut-off circuit 10f11. As a result, the power cut-off circuit 10f11 disconnects the power supply and stops supplying power to the display unit 10b1.

[0210] In addition, if the signal processing unit 10c11-2 receives a disconnect command from the LED controller, it will switch the PHY (103) and CPU (104) from the normal state to the standby state.

[0211] LED module 10-21b includes a power supply unit 10d21-2, a signal processing unit 10c21-2, a power cut-off circuit 10f21, and a display unit 10b2. Additionally, LED module 10-21b includes terminals 21t3, 22t3, 23t3, 21t4, 22t4, and 23t4.

[0212] The power supply unit 10d21-2 converts externally supplied AC power to DC power and outputs it to the signal processing unit 10c21-2. Here, the power supply unit 10d21-2 is not equipped with... Figure 6 The switch section 10d11b shown Figure 7The circuit shown is an AC relay d11d, a relay control circuit 10d11c, etc., which is a circuit that is turned on and off based on a power control signal.

[0213] Regarding the signal processing unit 10c21-2, when a power control signal is received from the preceding LED module 10-11b connected to the same column, the signal processing unit 10c21-2 switches the PHY (103) and CPU (104) from the standby state to the normal state. Here, in the LED module (e.g., LED module 10-21b) connected after the primary LED module (e.g., LED module 10-11b) connected to the LED controller 4, the primary LED module is in standby state and therefore cannot receive Wake-on-LAN packets (start signals).

[0214] When the signal processing unit 10c21-2 receives a start signal from the LED module connected to the front end, the PHY device (103) and CPU (104) in the signal processing unit 10c11-2 switch from standby state to normal state. Then, when switching from standby state to normal state, the signal processing unit 10c21-2 generates a power control signal to turn on the power cut-off circuit 10f21, and supplies power from the power cut-off circuit 10f21 to the display unit 20b1.

[0215] In addition, when generating a power control signal, the signal processing unit 10c21-2 supplies the power control signal to the signal processing unit of the next-level LED module in the same column via the second path 22A3, and also supplies it to the power cut-off circuit 10f21.

[0216] When transitioning from the normal state to the standby state, the signal processing unit 10c21-2 transitions to the standby state by obtaining the aforementioned disconnect command from the signal processing unit 10c11-2. Alternatively, the signal processing unit 10c21-2 can also transition to the standby state by obtaining a power control signal for disconnecting the power supply from the signal processing unit 10c11-2.

[0217] In the signal processing unit 10c21-2, when a disconnect command is received from the LED controller or a power control signal is received from the preceding LED module, a power control signal for disconnecting the power is generated and output to the power cut-off circuit 10f21. As a result, the power cut-off circuit 10f21 disconnects the power supply, stopping the power supply to the display unit 10b2.

[0218] In addition, when the signal processing unit 10c21-2 receives a disconnect command or a power control signal for disconnecting the power supply from the LED module in the front stage, it causes the PHY (103) and CPU (104) to switch from the normal state to the standby state.

[0219] Figure 14 This is a diagram illustrating an example of how much power reduction is calculated in the aforementioned LED display device.

[0220] In this example, we will illustrate the relationship between the structure and power consumption of an LED module as follows.

[0221] (Example a) In existing LED modules, the power consumption of one LED module when displaying a completely black screen is 20W.

[0222] (Example b) will have Figure 5 The power consumption of the LED module shown is 2W when the DC output of the LED module in the power supply section is disconnected.

[0223] (Example c) will Figure 6 The power consumption of the LED module shown, when the AC relay of the LED module with the power supply section is disconnected, is 0.3W.

[0224] (Example d) will have Figure 6 The AC relay of the LED module in the power supply section shown is disconnected, and the following is applied: Figure 10 The power consumption of the LED module in the signal processing unit shown is 0.5W.

[0225] Here, when using multiple LED modules from any of the examples a to d above to construct an LED display device, the number of arrangements was calculated for four types: 4×4, 5×5, 6×6, and 8×8. 4×4 involves 4 LED modules arranged vertically and 4 LED modules arranged horizontally, totaling 16 LED modules. Similarly, 5×5 involves 5 LED modules arranged vertically and 5 horizontally, totaling 25 LED modules. 6×6 involves 6 LED modules arranged vertically and 6 horizontally, totaling 36 LED modules. 8×8 involves 8 LED modules arranged vertically and 8 horizontally, totaling 64 LED modules.

[0226] (Regarding example a)

[0227] When power is supplied from the distribution panel, all LED modules are switched to drive mode. Here, even without a video signal, power is consumed to display the entire image in black and white. Furthermore, the total power consumption in a 4x4 configuration is 320W, increasing with the number of LED modules arranged. The total power consumption for an 8x8 configuration is 1280W.

[0228] (Regarding example b)

[0229] When power is supplied from the distribution panel but no video signal is supplied, one LED module is driven normally, but the other LED modules stop the DC output of the power supply unit. The total power consumption is 50W in the 4×4 configuration and 146W in the 8×8 configuration. Therefore, compared to Example 1, the power consumption is reduced by 1134W in the 8×8 configuration.

[0230] (Regarding example c)

[0231] With power supplied from the distribution panel but no video signal, one LED module is driven normally, while the AC relays of the power supply units of the other LED modules are disconnected. The total power consumption is 24.5W in the 4×4 configuration and 38.9W in the 8×8 configuration. Therefore, compared to Example 1, the power consumption reduction in the 8×8 configuration is 1241.1W.

[0232] (Regarding example d)

[0233] When power is supplied from the distribution panel but no video signal is supplied, one LED module is driven in standby mode, while the AC relays of the power supply units of the other LED modules are disconnected. The total power consumption is 5W in the 4×4 configuration and 19.4W in the 8×8 configuration. Therefore, compared to Example 1, the power consumption reduction in the 8×8 configuration is 1260.6W.

[0234] Thus, compared to conventional structures, power consumption can be reduced in this embodiment. Furthermore, the greater the increase in the number of LED modules, the greater the reduction in power consumption.

[0235] In existing LED display devices, the AC power supply for LED modules arranged in a column direction is connected in series with a distribution panel. When AC power is supplied, various circuits within the LED modules operate and consume power even when no video is displayed. Furthermore, since LED display devices are composed of multiple LED modules, the overall power consumption of the LED display device increases with the number of LED modules, and the power consumption when no video is displayed cannot be ignored. In contrast, according to the above embodiment, one LED module generates a power control signal based on a start signal received from the LED controller and supplies it to the other LED modules. Thus, when the other LED modules receive this power control signal, they can transition from a standby state to a normal state. Therefore, when no video signal is displayed, the other LED modules can transition to a standby state without transitioning to a normal state, thereby reducing power consumption. Here, when the LED module is in a standby state, the signal processing unit cuts off the power supply to the display unit. Therefore, even when the power supply unit is activated, at least no power is supplied to the display unit, thus reducing power consumption accordingly. Furthermore, by keeping the power supply unit in an unactivated state, power consumption can be further reduced.

[0236] In this way, in addition to setting up a path for supplying video signals (first path) and a path for supplying AC power (third path), a path for supplying power control signals (second path) is also set up. According to the power control signals, the functions of each LED module are started or stopped, thus reducing power consumption.

[0237] Furthermore, existing LED display devices are configured with multiple LED modules. Therefore, if the power supplies of all LED modules are turned on simultaneously, a large inrush current will be generated. In contrast, according to the above embodiment, since a delay circuit is provided for the LED module, it does not start immediately after receiving the power control signal from the preceding LED module, but rather after a set delay time. Therefore, the start-up time can be set to a different time than that of the preceding LED module, thus reducing the inrush current.

[0238] Alternatively, it can be used to implement Figure 1 The functions of the processing unit are recorded on a computer-readable recording medium, which the computer system reads and executes to perform construction management. Furthermore, the "computer system" mentioned here includes hardware such as the operating system and peripheral devices.

[0239] In addition, if the system is a WWW system, then "computer system" also includes the homepage provisioning environment (or display environment).

[0240] Furthermore, "computer-readable recording media" refers to removable media such as floppy disks, optical disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into computer systems. Moreover, "computer-readable recording media" includes media that retain programs for a certain period of time, such as volatile memory within a computer system that serves as a server or client. Additionally, the aforementioned program can be a program used to implement the above-mentioned functions, or it can be a program that can implement the above-mentioned functions by combining with programs already recorded in the computer system. Alternatively, the aforementioned program can be stored on a designated server and distributed (downloaded, etc.) via communication lines upon request from other devices.

[0241] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the specific structure is not limited to these embodiments, and may also include designs that do not depart from the spirit of the present invention.

[0242] [Explanation of reference numerals in the attached figures]

[0243] 1…LED display device, 2…power distribution panel, 3…video signal supply device, 4…LED controller, 10, 10-11, 10-11-2, 10-11b, 10-12, 10-12-2, 10-13, 10-14, 10-15, 10-16, 10-21, 10-21a, 10-21b, 10-22, 10-31, 10-41, 10-51, 10-61…LED modules, 10-13G, 10-14G…module groups, 10a…LED substrate, 10b, 10b1, 10b2…display 10c11a, 10d1a… Display section, 10c12, 10c12-2, 10c2, 10c21, 10c21-2… Signal processing section, 10d, 10d1, 10d11, 10d11-2, 10d2, 10d21, 10d21-2… Power supply section, 10d1-1… Power-on signal supply section, 10d11a… AC-DC converter section, 10d11b… Switch section, 10d11c… Relay control circuit, 11d11d… AC relay, 10e… Delay circuit, 10ele… LED components, 10f11, 10f21… power cut-off circuit, 10mod… signal processing module, 13… LED module, 21A1, 21B1… communication cable, 21, 22, 23A, 23A1… power cord, 21A2, 21A3… first path, 21t1, 21t2, 21t3, 21t4, 22t2, 22t3, 22t4, 23t1, 23t2, 23t3, 23t4… terminals, 22A2, 22A3, 25A1… second path, 22A21… supply path, 23A2, 23A3… third path Path, 24A1…Fourth path, 101…First connector, 102, 109…Pulse transformer, 103, 103a, 106…PHY device, 105…Buffer circuit, 108…Video / control data signal processing unit, 110…Second connector, 115…Standby power supply unit, 116…Main power supply unit, 121, 131…Power control signal input terminals, 122, 132…Switch, 123…Vertical output terminal, 124…Horizontal output terminal, 125…Horizontal power supply terminal, 141…Diode, 142…Connection point, S…Display system.

Claims

1. An LED display device comprising a plurality of LED modules arranged thereon, the LED module comprising: The display section is equipped with multiple LED components; The signal processing unit enables the display unit to display video based on a video signal supplied from an external device; and the power supply unit, which at least supplies the signal processing unit with power from an external source, wherein, The first LED module and the second LED module connected to the first LED module in the plurality of LED modules have: The first path is the path that connects the signal processing unit of the first LED module and the signal processing unit of the second LED module, and supplies a signal including a video signal. The second path is a path that connects the signal processing unit of the first LED module to the power supply unit of the second LED module, supplying a power control signal. This power control signal is used to supply power from the power supply unit of the second LED module to the signal processing unit of the second LED module; and The third path is a path that connects the power supply section of the first LED module to the power supply section of the second LED module, supplying power from the outside to the power supply section of the second LED module.

2. The LED display device according to claim 1, wherein, When the signal processing unit of the first LED module receives a start signal from the external device, it generates the power control signal and supplies it via the second path.

3. The LED display device according to claim 2, wherein, The second LED module has a delay circuit that delays the arrival time of the power control signal supplied from the first LED module at the power supply section of the second LED module.

4. The LED display device according to claim 3, wherein, The second LED module has a supply path that supplies the power control signal to the signal processing unit of a third LED module connected in the next stage. The supply path supplies either a power control signal before it is input to the delay circuit or a power control signal delayed by the delay circuit.

5. The LED display device according to claim 4, wherein, The first LED module receives standby power from the power supply unit to the signal processing unit, which is sufficient to maintain the standby state. The signal processing unit has: The detection unit, driven by the standby power, detects whether a start signal has been supplied from the external device; and The control unit is driven by the standby power. Before the detection unit detects the start signal, it stops the drive of the power supply unit of the first LED module. When the detection unit detects that the start signal has been supplied, it drives the drive of the power supply unit of the first LED module.

6. The LED display device according to claim 1, wherein, The first LED module and the second LED module are configured adjacent to each other, and the next level of the series different from the second LED module, namely the fourth LED module, is configured adjacent to the first LED module. The signal processing unit of the first LED module also has a fourth path, which is connected to the power supply unit of the fourth LED module and supplies a power control signal, which causes the power supply unit of the fourth LED module to supply power to the signal processing unit of the fourth LED module.

7. The LED display device according to claim 6, wherein, The first LED module has: a first terminal capable of connecting the second path relative to the second LED module; and a second terminal capable of connecting the fourth path relative to the fourth LED module. The power control signal is supplied to the second LED module and the fourth LED module by supplying the power control signal to the first terminal and the second terminal from the signal processing unit of the first LED module.

8. The LED display device according to claim 7, wherein, The plurality of LED modules have a switch connected between the signal processing unit of the LED module itself and the first and second terminals that can be connected to subsequent LED modules. The switch selects one of the power control signal output from the signal processing unit and the power control signal supplied from the LED module connected to the preceding stage, and supplies it to the first and second terminals.

9. The LED display device according to claim 1, wherein, The second path is connected to the signal processing unit of the first LED module and any LED module in the next level or subsequent stage of the first LED module, and supplies a power control signal. The power control signal is used to supply power from the power supply unit of the LED module to the signal processing unit of the LED module to be supplied.

10. A method for connecting LED modules, comprising a first LED module in a plurality of LED modules in an LED display device and a second LED module connected at the next lower level of the first LED module, wherein the LED display device has the plurality of LED modules arranged thereon, and the LED module includes: The display section is equipped with multiple LED components; The signal processing unit enables the display unit to display video based on a video signal supplied from an external device; and the power supply unit, which at least supplies the signal processing unit with power from an external source, wherein, The signal processing unit of the first LED module is connected to the signal processing unit of the second LED module via a first path, and a signal including a video signal is supplied through this first path. The signal processing unit of the first LED module is connected to the power supply unit of the second LED module via a second path. A power control signal is supplied via the second path, which is used to supply power from the power supply unit of the second LED module to the signal processing unit of the second LED module. The power supply unit of the first LED module is connected to the power supply unit of the second LED module through a third path, and the power supplied from the outside to the power supply unit of the first LED module is supplied to the power supply unit of the second LED module through the third path.

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