LED display device, control method of LED display device

Abstract

An LED display device in which a plurality of LED modules are arranged, the LED module having: a signal processing section (1c11) that causes a video based on a video signal supplied from an external device to be displayed on a display section; an AC / DC power supply section (1d11) that converts alternating-current power supplied from a power supply path connecting a power input port (23t-1) and a power output port (23t-2) into direct-current power and supplies the direct-current power to the signal processing section (1c11); a first switch provided in the power supply path that switches whether or not to supply the alternating-current power input to the power input port (23t-1) to the power output port (23t-2); and a switch control section (1c11d) that, in response to the signal processing section (1c11) detecting an external video signal, supplies a first switching control signal to the first switch, the first switching control signal causing the first switch to switch to supply the alternating-current power input to the power input port (23t-1) to the power output port (23t-2).

Description

Technical Field

[0001] This invention relates to LED display devices and control methods for LED display devices. Background Technology

[0002] An LED display system exists which comprises an LED display consisting of multiple LED (Light Emitting Diode) modules arranged adjacent to each other, and displays video corresponding to a video signal supplied from a video source device. In this LED display system, a power distribution panel is connected, from which power is supplied to the LED display system. The power supplied from the power distribution panel is then supplied to each LED module of the LED display.

[0003] In this LED display system, it is desirable to reduce power consumption. To reduce power consumption, it is considered to operate the distribution panel to cut off the power supply to the LED display when the power supply to the LED display is interrupted.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2011-008303 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In such LED display systems, the distribution panel is sometimes located far from the LED display or control room. In this case, a system is needed to remotely control the power supply to the distribution panel for each LED display system, or in distribution panels that cannot be remotely operated, the operator must go to the location where the distribution panel is located and operate it manually.

[0009] Furthermore, when powering an LED display, if multiple LED modules are powered simultaneously, the surge current can become enormous, depending on the size of the LED display. This can cause the circuit breaker in the distribution panel to trip, sometimes cutting off the power supply. As a result, the LED display may be unable to start until the distribution panel is restored.

[0010] Furthermore, even when the LED display is not showing video, and the video signal supply is cut off by stopping the operation of the video source device, the LED module is still being powered. In this situation, even if the LED panel is off, power consumption will still occur because the signal processing unit and other components within the LED module are still operating.

[0011] Therefore, an LED display device and a control method for the LED display device are provided, which can reduce the power consumption of the LED display and can easily manage the power consumption so as to avoid the generation of inrush current.

[0012] Methods for solving problems

[0013] One aspect of the present invention is an LED display device comprising a plurality of LED modules arranged thereon, wherein each LED module includes: a display unit on which a plurality of LED elements are mounted; a signal processing unit for displaying video based on a video signal supplied from an external device on the display unit; a power input port for receiving AC power from an external source; a power output port for supplying the AC power input to the power input port to a subsequent LED module; and an AC / DC power supply unit for converting the AC power supplied from the power path connecting the power input port and the power output port into DC power, and supplying at least the DC power to the signal processing unit. The DC power supply; a first switch, disposed in the power path, for switching whether to supply AC power input to the power input port to the power output port; a video signal input port, into which the video signal is input; a video output port, capable of supplying the video signal input to the video signal input port to the subsequent LED module; and a switch control unit, which, in response to the signal processing unit detecting the video signal, supplies a first switching control signal to the first switch, the first switching control signal causing the first switch to switch to supply AC power input to the power input port to the power output port.

[0014] Another aspect of the present invention is an LED display device comprising a plurality of LED modules arranged thereon, wherein each LED module includes: a display unit on which a plurality of LED elements are mounted; a signal processing unit for displaying video based on a video signal supplied from a preceding LED module on the display unit; a power input port for receiving AC power from the preceding LED module; a power output port for supplying the AC power input to the power input port to a subsequent LED module; an AC / DC power supply unit for converting AC power supplied from a power path connecting the power input port and the power output port into DC power, and supplying the DC power to at least the signal processing unit; and a second switch for switching between... The power supply path supplies AC power to the AC / DC power supply unit; a video signal input port receives the video signal; and a video output port supplies the video signal input to the video signal input port to the subsequent LED module. The second switch is switched to supply AC power from the power supply path to the AC / DC power supply unit via a second switching control signal input from the preceding LED module. The LED module also has a switch control unit that, in response to the signal processing unit detecting the video signal, supplies a third switching control signal to the subsequent LED module, which causes the second switch of the subsequent LED module to switch.

[0015] Another aspect of the present invention is a control method for an LED display device, the LED display device having a plurality of LED modules arranged thereon, each LED module comprising: a display unit having a plurality of LED elements mounted thereon; a signal processing unit for displaying video based on a video signal supplied from an external device on the display unit; and a first switch for switching whether to supply AC power supplied from the external device to the LED module connected to a subsequent stage, wherein the AC power supplied from the external device is converted to DC power and supplied to the signal processing unit, and when the DC power is supplied, the signal processing unit supplies the externally input video signal to the LED module of the subsequent stage, and the signal processing unit, in response to detecting the video signal, supplies the first switching control signal to the first switch, the first switching control signal causing the first switch to switch to supply the AC power to the LED module of the subsequent stage.

[0016] Another aspect of the present invention is a control method for an LED display device, the LED display device having a plurality of LED modules arranged thereon, each LED module having: a display unit having a plurality of LED elements mounted thereon; a signal processing unit for displaying video based on a video signal supplied from a preceding LED module on the display unit; and a second switch for switching whether to supply AC power supplied from the preceding LED module to an AC / DC power supply unit, wherein the second switch is switched to supplying the AC power to the AC / DC power supply unit in response to a switching control signal supplied from the preceding LED module to the second switch, the AC / DC power supply unit converting the AC power to DC power and supplying it to the signal processing unit, and when the DC power is supplied, the signal processing unit supplies the externally input video signal to the subsequent LED module, and the signal processing unit supplies a third switching control signal to the subsequent LED module in response to detecting the video signal, the third switching control signal causing the second switch of the subsequent LED module to switch.

[0017] Invention Effects

[0018] According to the present invention, the power consumption of LED displays can be reduced, while power consumption can be easily managed so as to prevent the generation of surge current. Attached Figure Description

[0019] Figure 1 This is a schematic structural diagram of the LED display system S according to this embodiment.

[0020] Figure 2 This is a simplified functional block diagram illustrating the structure of LED modules 1-11.

[0021] Figure 3 This is a diagram showing an LED display system Sa consisting of three LED modules 1-11 connected in the column (vertical) direction.

[0022] Figure 4 This diagram illustrates the situation where the video signal supply stops in the LED display system Sa.

[0023] Figure 5 This is a schematic functional block diagram illustrating the structure of LED module 1-111 in the second embodiment.

[0024] Figure 6 This is a diagram showing an LED display system Sb consisting of three LED modules 1-21 connected in the column (vertical) direction.

[0025] Figure 7 This diagram illustrates the situation where the video signal supply stops in the LED display system Sb.

[0026] Figure 8 This is a schematic functional block diagram representing the structure of LED module 1-112 of type 1.

[0027] Figure 9 This is a schematic functional block diagram representing the structure of LED modules 1-113 of the second type.

[0028] Figure 10 This is a diagram showing the structure of the LED display system Sc.

[0029] Figure 11 This is a diagram showing the structure of the LED display system Sd. Detailed Implementation

[0030] Hereinafter, an embodiment of the LED display system of the present invention will be described with reference to the accompanying drawings.

[0031] Implementation Method 1

[0032] (LED display system)

[0033] Figure 1 This is a schematic structural diagram of the LED display system S according to this embodiment.

[0034] The LED display system S includes an LED display LD, a video source device VS, an LED controller LC, a power distribution panel DB, signal cables SC, and power cables PC.

[0035] (LED display LD)

[0036] The LED display LD includes multiple LED modules 1.

[0037] LED modules 1 are arranged adjacently in a vertical and horizontal configuration. In this figure, multiple LED modules 1 are arranged in groups n (n is a natural number greater than 2) vertically and m (m is a natural number greater than 2) horizontally, for a total of n×m LED modules 1. The LED display LD uses the entire display area of ​​these multiple LED modules 1 arranged in this way to display video based on video signals.

[0038] LED modules 1 are cascaded together, and video signals and power are supplied to LED modules 1 connected to the next level.

[0039] For example, LED module 1-11 is configured at the bottom level (level 1) of the leftmost column (column 1), and LED modules 1-21, ..., LED modules 1-n1 are arranged in sequence above it and connected in series.

[0040] In addition, LED modules 1-12, ..., 1-1m are arranged sequentially on the right side of LED module 1-11 and connected in series.

[0041] Here, the LED modules 1 in each column are connected in series with their vertically adjacent LED modules 1 via communication cables (e.g., LAN (Local Area Network) cables). Furthermore, the primary LED modules 1 in each column are connected to the LED controller LC via communication cables (e.g., LAN cables). More specifically, LED modules 1-11 and 1-12 are electrically connected to the LED controller LC via signal cables SC. Thus, the primary LED modules 1 in each column are supplied with video signals output from the LED controller LC. The primary LED modules 1 in each column also output various signals to the LED modules 1 connected to the next stage via communication cables. Therefore, the video signals are sequentially transmitted from the primary LED modules 1 in each column to the final stage LED modules 1.

[0042] Furthermore, in each column of LED module 1, the two adjacent LED modules 10 are connected to the distribution panel DB and supplied with AC power. For example, LED modules 1-11, LED modules 1-12, ..., LED modules 1-1m are connected to the distribution panel DB via power cables PC. Thus, the module group in the first column containing LED modules 1-11, the module group in the second column containing LED modules 1-12, and the module group in the mth column containing LED modules 1-1m are each supplied with AC power from the power cables PC.

[0043] By connecting multiple LED modules 1 in this way, for example, if the display resolution of a single LED module 1 is 192×108, and if 10 LED modules 1 are arranged vertically and 10 horizontally, a 1920×1080 (full HD) LED display LD can be formed.

[0044] The video source device VS is connected to the LED controller LC via a communication cable and is the source of the video signal output to the LED controller LC. The specifications of the communication cable connecting the video source device VS and the LED controller LC can also correspond to any of the specifications such as DVI I / F or HDMI (registered trademark) I / F.

[0045] The video source device VS can also be, for example, a computer.

[0046] The system receives the video signal output from the video source device VS, divides the video signal into sections according to each zone of the cascaded LED module 1, and outputs the signal to the LED module 1 via the signal cable SC after converting it into a signal format that the LED module can receive.

[0047] If no video signal is supplied from the video source device VS, then no signal needs to be output to the LED module.

[0048] The LED controller LC supplies video signals to the LED module 1. The LED controller LC is an example of an external device.

[0049] The LED controller LC outputs the video signal from the video source device VS to the LED display LD. For example, the LED controller LC divides the video signal from the video source device VS according to the arrangement of LED modules 1, converts it into a video signal format that can be received on the LED module 1 side, and outputs it to the LED module 1.

[0050] Distribution panel

[0051] The distribution panel 2 is equipped with a safety circuit breaker or a residual current circuit breaker, and supplies the AC power required for the operation of each LED module 1 of the LED display LD via a power cable PC. The supplied power is, for example, AC (Alternating Current) power.

[0052] The signal cable SC supplies the video signal from the output port of the LED controller LC to the primary LED module 1 of each column.

[0053] LED module 1 outputs the video signal supplied from the video source device VS or the preceding LED module 1 to the next cascaded LED module 1. Subsequently, the signal is also supplied to the cascaded LED modules 1.

[0054] The power cable PC supplies AC power from the distribution panel DB to the primary LED modules 1 (1-11, 1-12, ..., 1-1m) in each column.

[0055] The AC power input from the power input terminal is output to the LED module connected to the next stage. Subsequently, AC power is also supplied to the cascaded LED modules.

[0056] Figure 2 This is a simplified functional block diagram illustrating the structure of LED modules 1-11.

[0057] Here, in multiple LED modules 1, it is explained Figure 1The LED module 1-11 shown is an example, but other LED modules 1 (1-21, 1-n1, 1-12, 1-22, ..., 1-nm, etc.) also have the same function.

[0058] LED module 1-11 includes video signal input terminal 21t-1, video signal output terminal 21t-2, power input terminal 23t-1, power output terminal 23t-2, LED display unit 1b11, signal processing unit 1c11, AC / DC power supply unit 1d11, switch 1sa11, and switch 1sb11, and is mounted on the electrical board 1EB.

[0059] The video signal input terminal 21t-1 is electrically connected to the LED controller LC via the signal cable SC, and receives the video signal supplied from the LED controller LC. The video signal input terminal 21t-1 is also connected to the input terminal of the signal processing unit 1c11 via a signal line. The video signal input terminal can also be a video signal input port.

[0060] The video signal output terminal 21t-2 is electrically connected to the output terminal of the video processing unit 1c11a via a signal line. The video signal output terminal 21t-2 can supply the video signal input to the video signal input terminal 21t-1 to the subsequent LED module.

[0061] The video signal output terminal 21t-2 is connected to the video signal input terminal 21t-3 of the LED module 1-21, which is installed adjacent to the next level of the LED module 1-11. The signal output terminal can also be a video output port.

[0062] The power input terminal 23t-1 receives AC power from an external source. This external source could be, for example, the distribution panel DB or the power output terminal of the preceding LED module. More specifically, the power input terminal 23t-1 of the primary LED module is connected to the distribution panel DB, and the power input terminals of subsequent LED modules are connected to the power output terminals of the preceding LED modules. The power input terminal can also be a power input port.

[0063] The power input terminal 23t-1 is electrically connected to the distribution panel DB via the power cable PC, and receives power supplied from the distribution panel DB. The power input terminal 23t-1 is also electrically connected to the first terminal of the AC / DC power supply unit 1d11 and the switch 1sa11 via power lines.

[0064] The power output terminal 23t-2 can supply AC power input to the power input terminal 23t-1 to the subsequent LED module. The power output terminal can also be a power output port.

[0065] For example, the power output terminal 23t-2 is electrically connected to the second terminal of the switch 1sa11 via a power line. The power output terminal 23t-2 is connected to the power input terminal 23t-3 of the LED module 1-21, which is installed adjacent to the next level of the LED module 1-11.

[0066] When switch 1sa11 is in the ON state, AC power is supplied from power output terminal 23t-2 to the next cascaded LED module 1 (e.g., LED module 1-21). When switch 1sa11 is in the OFF state, AC power is not supplied from power output terminal 23t-2 to the next cascaded LED module 1 (e.g., LED module 1-21).

[0067] In this way, LED module 1 receives the video signal output from the signal output terminal of the LED controller LC or the cascaded LED module 1 from the video signal input terminal, and inputs the input video signal to the video processing unit of the signal processing unit, and outputs it to the signal output terminal of the cascaded LED module connected to the next stage.

[0068] The AC / DC power supply unit 1d11 converts the AC power supplied from the power path connecting the power input terminal 23t-1 and the power output terminal 23t-2 into DC power, and supplies DC power to at least the signal processing unit 1c11.

[0069] For example, the AC / DC power supply unit 1d11 converts the AC power supplied from the power input terminal 23t-1 into DC power and supplies it to the signal processing unit 1c11 and the first terminal of the switch 1sb11. When the switch 1sb11 is in the ON state, the DC power output from the AC / DC power supply unit 1d11 is supplied to the LED display unit 1b11; when the switch 1sb11 is in the OFF state, the DC power is not supplied to the LED display unit 1b11. By supplying DC power from the AC / DC power supply unit 1d11 to the signal processing unit 1c11, the signal processing unit 1c11 can be driven. Similarly, by supplying DC power from the AC / DC power supply unit 1d11 to the LED display unit 1b11, the LED display unit 1b11 can be driven.

[0070] The signal processing unit 1c11 displays video based on a video signal supplied from an external device on the display unit. The external device may be, for example, an LED controller LC or an LED module connected to a preceding stage. More specifically, LED modules connected to the primary stage are connected to the LED controller LC, and LED modules connected to the second stage and subsequent stages are connected to the preceding stage's LED module.

[0071] The signal processing unit 1c11 comprises a video processing unit 1c11a, an LED drive signal generation unit 1c11b, a video detection unit 1c11c, a switch control unit 1c11d, and an amplification element 1c11e. The signal processing unit 1c11 extracts the video portion of the object to be displayed by its own LED module 1-11 from the video signal input to the video signal input terminal 21t-1, generates an LED drive signal corresponding to the extracted video portion, and supplies it to the LED display unit 1b11.

[0072] The video detection unit 1c11c determines (detects) whether a video signal is input from the video signal input terminal 21t-1 (the presence or absence of the video signal), and outputs its determination result to the switch control unit 1c11d.

[0073] In response to the signal processing unit 1c11 detecting a video signal, the switch control unit 1c11d supplies a first switching control signal to the switch 1sa11. The first switching control signal causes the switch 1sa11 to switch to supply AC power input to the power input terminal 23t-1 to the power output terminal 23t-2.

[0074] In addition, in response to the signal processing unit 1c11 not detecting a video signal, the switch control unit 1c11d supplies a first switching control signal to the switch 1sa11. The first switching control signal causes the switch 1sa11 to switch to not supply the AC power input to the power input terminal 23t-1 to the power output terminal 23t-2.

[0075] For example, based on the determination result of the video detection unit 1c11c, the switch control unit 1c11d sets the switches 1sa11 and 1sb11 to ON when a video signal is detected, and sets the switches 1sa11 and 1sb11 to OFF when no video signal is detected.

[0076] In addition, as long as the switch control unit 1c11d can prevent the AC power input to the power input terminal 23t-1 from being supplied to the power output terminal 23t-2, it can also supply a signal different from the first switching control signal to the switch 1sa11.

[0077] When switch 1sa11 is on, it supplies AC power to the next-level LED module 1; when it is off, it stops supplying AC power.

[0078] When switch 1sb11 is on, DC power is supplied to the LED display unit 1b11 in LED module 1-11; when it is off, the supply of DC power to the LED display unit 1b11 is stopped.

[0079] Switch 1sa11 is located in the power path and toggles whether AC power input to power input terminal 23t-1 is supplied to power output terminal 23t-2. Switch 1sa11 is an example of the first switch.

[0080] Amplifying element 1c11e supplies the video signal input from video signal input terminal 21t-1 to video signal output terminal 21t-2. By supplying the video signal from amplifying element 1c11e to video signal output terminal 21t-2, a video signal is supplied to the next-level LED module 1 in the same column. Here, when no video signal is supplied from video signal input terminal 21t-1, amplifying element 1c11e does not supply a video signal to video signal output terminal 21t-2.

[0081] The LED display unit 1b11 comprises one or more LED panels (LDPs). Multiple sets of LED light-emitting elements are mounted on the LED panel (LDP) in a manner arranged in both the horizontal (lateral) and vertical (longitudinal) directions. One LED light-emitting element corresponds to one pixel. Each LED light-emitting element includes a red-emitting LED element, a green-emitting LED element, and a blue-emitting LED element. The LED display unit 1b11 displays an image corresponding to a video signal based on a drive signal sent from the LED drive signal generation unit.

[0082] Figure 3 This indicates that 3 units are connected in the column (vertical) direction. Figure 2 The diagram shows an LED display system Sa composed of LED modules 1-11. In this diagram, LED modules 1-11, 1-21, and 1-31 are arranged and connected. Since LED modules 1-21 and 1-31 have the same function as LED module 1-11, the corresponding structures are labeled with the same name but different numbers, and their different functions are mainly explained.

[0083] When AC power is output from the distribution panel DB, power is supplied to the LED module 1-11 via the power input terminal 23t-1. This supplies AC power to the AC / DC power supply section 1d11 within the LED module 1-11.

[0084] When AC power is supplied, the AC / DC power supply unit 1d11 converts the AC power into DC power and supplies it to the signal processing unit 1c11. Here, the AC / DC power supply unit 1d11 also outputs DC power to the switch 1sb11, but when no switch control signal is output from the switch control unit 1c11d, the switch 1sb11 is open and does not supply power to the LED display unit 1b11.

[0085] The video source device VS outputs the video signal to the LED controller LC.

[0086] The LED controller LC supplies video signals from the video source device VS to the primary LED modules 1 located in each column. For example, the LED controller LC supplies video signals to LED modules 1-11.

[0087] Here, when no video signal is supplied from the LED controller LC to the LED module 1-11, the video detection unit 1c11c within the LED module 1-11 does not detect the video signal. Therefore, the video detection unit 1c11c supplies a detection result indicating that no video signal was detected to the switch control unit 1c11d. In this case, the switch control unit 1c11d supplies a switch control signal to the switch 1sa11 to switch 1sa11 to open. Therefore, the switch 1sa11 is open, and thus, AC power is not supplied to the cascaded LED modules 1-21, 1-31, and subsequent LED modules.

[0088] Next, when a video signal is supplied from the LED controller LC to the LED module 1-11, the video signal is supplied to the signal processing unit 1c11 within the LED module 1-11. The video detection unit 1c11c of the signal processing unit 1c11 detects the video signal and supplies a detection result indicating that a video signal has been detected to the switch control unit 1c11d. In response to the detection result indicating that a video signal has been detected, the switch control unit 1c11d outputs a switch control signal to switch 1sb11 to turn on, and simultaneously outputs a switch control signal to switch 1sa11 to turn on. Thus, switches 1sb11 and 1da11 are both turned on. When switch 1sb11 is turned on, DC power is supplied from the AC / DC power supply unit 1d11 to the LED display unit 1b11. When switch 1sa11 is turned on, the AC power input through power input terminal 23t-1 is supplied to LED module 1-21 through power input terminal 23t-3 connected to power output terminal 23t-2.

[0089] On the other hand, when a video signal is supplied from the LED controller LC to the LED modules 1-11, and the video signal is supplied to the signal processing unit 1c11, the video processing unit 1c11a generates an LED driving signal based on the video signal and supplies it to the LED display unit 1b11. When DC power is supplied from the AC / DC power supply unit 1d11, and an LED driving signal corresponding to the video signal is supplied from the video processing unit 1c11a, the LED display unit 1b11 drives each LED light-emitting unit according to the LED driving signal. Thus, video based on the video signal is displayed on the LED display unit 1b11.

[0090] Additionally, when a video signal is supplied from the LED controller LC to the signal processing unit 1c11 of the LED module 1-11, the signal processing unit 1c11 supplies the video signal to the video signal output terminal 21t-2 via the amplification element 1c11e. The video signal supplied to the video signal output terminal 21t-2 is then supplied to the signal processing unit 1c21 via the video signal input terminal 21t-3 of the LED module 1-21.

[0091] In this way, in response to the video signal being supplied to the LED module 1-11, the video corresponding to the video signal is displayed on the LED display unit 1b11, while AC power and video signal are supplied to the LED module 1-21.

[0092] It should be noted that before AC power is supplied from the distribution panel DB to the LED module 1-11, and when a video signal is supplied from the LED controller LC to the LED module 1-11, no power is supplied from the AC / DC power supply unit 1d11 to the signal processing unit 1c11. Therefore, no switch control signal is supplied from the signal processing unit 1c11 to the switch 1sb11. Consequently, the LED display unit 1b11 is not driven and therefore no video is displayed.

[0093] When AC power is supplied to LED module 1-21, AC / DC power supply unit 1d21 converts AC power into DC power and supplies it to signal processing unit 1c21. Here, AC / DC power supply unit 1d11 also outputs DC power to switch 1sb21, but when no switch control signal is output from switch control unit 1c21d, switch 1sb21 is open and no power is supplied to LED display unit 1b11.

[0094] Next, when a video signal is supplied from the video signal output terminal 21t-2 of the LED module 1-11 to the video signal input terminal 21t-3, the video signal is supplied to the signal processing unit 1c21 within the LED module 1-21. The video detection unit 1c21c of the signal processing unit 1c21 detects the video signal and supplies a detection result indicating that a video signal has been detected to the switch control unit 1c21d. In response to the detection result indicating that a video signal has been detected, the switch control unit 1c11d outputs a switch control signal to switch 1sb21 to turn on, and simultaneously outputs a switch control signal to switch 1sa11 to turn on. Thus, switches 1sb21 and 1da21 are both turned on. When switch 1sb21 is turned on, DC power is supplied from the AC / DC power supply unit 1d21 to the LED display unit 1b21. When switch 1sa21 is turned on, the AC power input via power input terminal 23t-3 is supplied to LED module 1-31 via power input terminal 23t-5 connected to power output terminal 23t-4.

[0095] On the other hand, when a video signal is supplied from LED module 1-11 to LED module 1-21, and the video signal is supplied to signal processing unit 1c21, video processing unit 1c21a extracts the video portion displayed by its own LED module 1-21 from the video signal, performs video processing on the extracted video portion, and outputs it to LED drive signal generation unit 1c21b. LED drive signal generation unit 1c21b generates LED drive signals based on the switch control signals input from video processing unit 1c21a, and outputs them to LED display unit 1b21. When DC power is supplied from AC / DC power supply unit 1d21, and LED drive signals corresponding to the video signal are supplied from LED drive signal generation unit 1c21b, LED display unit 1b21 drives each LED light-emitting part according to the LED drive signals. Thus, video based on the video signal is displayed on LED display unit 1b21.

[0096] Additionally, when a video signal is supplied from LED module 1-11 to the signal processing unit 1c21 of LED module 1-21, the signal processing unit 1c21 supplies the video signal to the video signal output terminal 21t-4 via the amplification element 1c21e. The video signal supplied to the video signal output terminal 21t-4 is then supplied to the signal processing unit 1c31 via the video signal input terminal 21t-5 of LED module 1-31.

[0097] Thus, when AC power is supplied to LED module 1-21, the operation of LED module 1-21 begins. The video detection unit 1c21c inside LED module 1-21 detects the signal, and the switch control unit 1c21d sets switches 1sb21 and 1sa21 to be turned on.

[0098] Therefore, LED module 1-21 becomes capable of displaying the status of the video corresponding to the video signal, while simultaneously supplying video signal and AC power to LED module 1-31.

[0099] Here, in Figure 3 In the current configuration, switch 1sa31 is open, but it becomes closed when AC power is supplied from LED module 1-21 to LED module 1-31. Furthermore, in response to a video signal being supplied from LED module 1-21, signal processing unit 1c31 closes switches 1sb31 and 1sa31. Thus, AC power is supplied from LED module 1-31 to the next-level LED module, and simultaneously, video corresponding to the video signal is displayed on LED display unit 1b31.

[0100] If multiple LED modules are connected to the next level after LED modules 1-31, power is supplied sequentially with a time difference, and the video corresponding to the video signal is displayed.

[0101] Furthermore, in the above example, the following situation was described: In response to the video signal being supplied to the signal processing unit 1c11, the switch control unit 1c11d outputs a switch control signal to the switch 1sa11 to switch 1sa11 on, thereby supplying power to the LED module 1-21. Then, the signal processing unit 1c11 supplies the video signal to the LED module 1-21. Here, it is also possible that after the signal processing unit 1c11 supplies the video signal to the LED module 1-21, the switch control unit 1c11d outputs a switch control signal to the switch 1sa11 to switch 1sa11 on, thereby supplying power to the LED module 1-21. Furthermore, the switch control unit 1c11d switches the switch 1sb11 on, supplying DC power from the AC / DC power supply unit 1d11 to the LED display unit 1b11. Additionally, the LED drive signal generation unit 1c11b generates an LED drive signal based on the video signal and supplies it to the LED display unit 1b11 to display the video.

[0102] In this way, the following sequence of processing can also be performed in each LED module (1-21, 1-31, ...) connected to the subsequent stage: after the signal processing unit 1c11 outputs a video signal to the subsequent stage, the switch 1sa11 is turned on to supply power to the LED module 1-21 of the subsequent stage.

[0103] Therefore, since the LED module is powered by the preceding LED module when the video signal is input, the switches (1sa21, 1sa31, ...) and switches (1sb21, 1sb31, ...) can be quickly turned on after being powered.

[0104] Here, each LED display unit (1b11, 1b21, 1b31, ...) of each LED module can also adjust its timing after supplying a video signal from the LED controller LC to the LED display LD, so that the video corresponding to the video signal is displayed simultaneously.

[0105] Figure 4 It means Figure 3 The diagram shows the situation where the video signal supply stops in the LED display system Sa.

[0106] When AC power is supplied from the distribution panel DB, the LED module 1-11 is in a power-supplying state. That is, it is in a state where AC power is supplied to the AC / DC power supply section 1d11 inside the LED module 1-11.

[0107] Furthermore, when outputting video signals from the LED controller LC, the switches (1sa11, 1sb11, 1sa21, 1sb21, 1sa31, 1sb31) in all cascaded LED modules (1-11, 1-21, 1-31) are in the ON state.

[0108] Here, when the video signal from the LED controller LC stops, the video detection unit 1c11c stops detecting the video signal, and therefore the switches 1sa11 and 1sb11 in the LED module 1-11 switch to the open state. Furthermore, because switch 1sa11 switches to the open state, the AC power supply to the subsequent LED modules 1-21, 1-31, and beyond is stopped.

[0109] Furthermore, as the video signal from the LED controller LC stops, the switch 1sb11 of the LED module 1-11 also switches to the off state, so no DC power is supplied to the LED display unit 1b11 of the LED module 1-11, and therefore no power consumption is generated in the LED display unit 1b11.

[0110] It should be noted that the period from the moment the video signal input to the signal processing unit 1c11 stops until the switch 1sb11 is turned off is a period during which power is supplied to the LED display unit 1b11. During this period, a video (black video) is displayed on the LED display unit 1b11 where the entire LED panel LDP is black.

[0111] Therefore, the only part that operates (consumes power) is the signal processing unit 1c11 within LED module 1-11. That is, even when AC power is supplied from the distribution panel DB, the AC / DC power supply unit 1d11 of LED module 1-11 converts the AC power to DC power and supplies DC power to the signal processing unit 1c11, but does not supply power from LED module 1-11 to subsequent LED modules (1-21, etc.). Therefore, the power consumption is limited to the signal processing unit 1c11 within LED module 1-11; no power is consumed in the LED display unit 1b11, and also not in the LED modules 1-21 and beyond.

[0112] Implementation Method 2

[0113] Figure 5 This is a schematic functional block diagram illustrating the structure of LED modules 1-111 in the second embodiment. Regarding LED modules 1-111, for the corresponding structures of LED modules 1-111 in the first embodiment, the same functions are labeled with the same number and their descriptions are omitted, while different functions are labeled with different numbers and described.

[0114] LED module 1-111 has an additional switch control input terminal 22t-1 and a switch control output terminal 22t-2 added as terminals on the electrical substrate 1EB1.

[0115] The switch control input terminal 22t-1 receives signals supplied from the outside.

[0116] The switch controls the output terminal 22t-2 to supply signals to the outside.

[0117] The signal processing unit 1c111 operates in response to the input of DC power from the AC / DC power supply unit 1d11, thereby supplying the video signal input to the video signal input terminal 21t-1 from the video signal output terminal 21t-2 to the subsequent LED module (e.g., LED module 1-211).

[0118] When no DC power is input from the AC / DC power supply unit 1d11, the signal processing unit 1c111 does not supply video signals to the downstream LED modules (e.g., LED modules 1-211).

[0119] In response to the signal processing unit 1c111 detecting a video signal, the switch control unit 1c11d1 supplies a switch control signal (e.g., a third switching control signal) to the subsequent LED module, which causes the switch 1sb111 of the subsequent LED module to switch.

[0120] In response to the signal processing unit 1c111 not detecting a video signal, the switch control unit 1c11d1 supplies a switch control signal (third switching control signal) to the downstream LED module. This switch control signal causes the second switch of the downstream LED module (e.g., switch 1sb211 of LED module 1-211) to switch off from supplying power to the AC / DC power supply unit 1d11 via the power path.

[0121] For example, the switch control unit 1c11d1 controls the switch 1sb11 to be turned on or off based on the detection result of whether the video detection unit 1c11c detects a video signal, and at the same time outputs a switch control signal from the switch control output terminal 22t-2 to the next-level LED module 1-211 connected in the cascade.

[0122] When a switch control signal is supplied from the switch control unit 1c11d1 to the switch 1sb11, the switch control unit 1c11d1 operates in response to the input of DC power from the AC / DC power supply unit 1d11, thereby supplying a switch control signal (the fourth switching control signal) to the switch 1sb11 (the fifth switch). This switch control signal causes the switch 1sb11 to switch to supply DC power from the AC / DC power supply unit 1d11 to the LED display unit 1b111.

[0123] When a switch control signal is supplied from the switch control unit 1c11d1 to the switch 1sb11, the switch control unit 1c11d1 responds to the video detection unit 1c11c of the signal processing unit 1c111 not detecting a video signal, and supplies a switch control signal (4th switching control signal) to the switch 1sb11. This switch control signal causes the switch 1sb11 to switch to not supply DC power from the AC / DC power supply unit 1d11 to the LED display unit 1b111.

[0124] Based on the detection result of the video signal detected by the video detection unit 1c11c, the switch control unit 1c11d1 switches the switch 1sb11 to the on. Conversely, based on the detection result of the video detection unit 1c11c not detecting a video signal, the switch control unit 1c11d1 switches the switch 1sb11 to the off.

[0125] Switch 1sb111 toggles whether AC power is supplied from the power path to AC / DC power supply unit 1d11.

[0126] The first terminal of switch 1sb111 is connected to the power supply path between power input terminal 23t-1 and power output terminal 23t-2. The second terminal of switch 1sb111 is connected to the power input terminal of AC / DC power supply unit 1d11.

[0127] For example, switch 1sb111 switches to supply AC power from the power path to the AC / DC power supply unit via a switch control signal (e.g., the second switching control signal) input from the LED module in the preceding stage.

[0128] Switch 1sb111 receives a switch control signal from the cascaded front-end LED module via switch control input terminal 22t-1. Switch 1sb111 is open when no switch control signal is input and closed when a switch control signal is input.

[0129] In response to switch 1sb111 becoming closed, AC power is supplied to AC / DC power supply unit 1d11 from the power supply path. In response to switch 1sb111 becoming open, the supply of AC power to AC / DC power supply unit 1d11 is cut off.

[0130] Switch 1sb111 is an example of the second switch.

[0131] Switch 1sa112 toggles whether to bypass switch 1sb111 (the second switch). By switching to bypass switch 1sb111, switch 1sa112 supplies AC power from the power path to AC / DC power supply unit 1d11.

[0132] The first terminal of switch 1sa112 is connected to the power supply path between power input terminal 23t-1 and power output terminal 23t-2. The second terminal of switch 1sb112 is connected to the power input terminal of AC / DC power supply unit 1d11.

[0133] Switch 1sa112 can be manually switched to either an on or off state. When switched to the on state, switch 1sa112 can supply AC power to AC / DC power supply unit 1d11 from the power supply path. When switch 1sa112 is switched to the off state, the AC power supply to AC / DC power supply unit 1d11 is cut off.

[0134] Switch 1sa112 is an example of the fourth switch.

[0135] Switch 1sb11 toggles whether DC power is supplied from AC / DC power supply unit 1d11 to LED display unit 1b111.

[0136] Switch 1sb11 is an example of the 5th switch.

[0137] Figure 6 This indicates that 3 units are connected in the column (vertical) direction. Figure 5 The diagram shows the LED display system Sb composed of LED modules 1-21.

[0138] In this diagram, LED modules 1-11, 1-21, and 1-31 are connected in an array. Since LED modules 1-21 and 1-31 have the same function as LED module 1-11, the corresponding structures are labeled with the same name, some of the labels are changed, and the different functions are mainly explained.

[0139] Switch 1sb-112 within LED module 1-111 can be manually set to ON. Switch 1sb-112 can also be set to ON during the initial setup after configuring the LED display system Sb. Switch 1sb-112 can also be always ON. By setting switch 1sb-112 to ON, AC power can be supplied from the distribution panel DB to the AC / DC power supply unit 1d11, regardless of whether switch 1sb-111 is ON. Here, since the switch control input terminal 22t-1 is not connected, it is always in the OFF state.

[0140] Switches 1sb-212 and 1sa-21 of LED module 1-211, which are cascaded with LED module 1-111, and switches 1sb-312 and 1sa-31 of LED module 1-311, are all off. Furthermore, when LED module 1 is connected to the next stage after LED module 1-31, the state of each switch is also off, just like switches 1sb-212 and 1sa-21 of LED module 1-211.

[0141] In addition, before the video signal is supplied to LED modules 1-11, the switch 1sb-211 of LED modules 1-211, the switch 1sb-311 of LED modules 1-311, and the corresponding switches in subsequent LED modules are in a state where no AC power is supplied to the AC / DC power supply section of each LED module because the switch control signal supplied from the preceding LED module of each LED module is in an off state (or no signal is input).

[0142] When AC power is supplied from the distribution panel DB, the LED module 1-11 is supplied with AC power and is in a state of supplying DC power from the AC / DC power supply unit 1d11 to the signal processing unit 1c111.

[0143] Here, when the video signal supply from the LED controller LC stops, from the perspective of the LED display system Sb as a whole, the AC / DC power supply unit 1d11 and the signal processing unit 1c111 in the LED module 1-111 work, but the operation of the LED modules other than the LED module 1-111 and the LED display unit 1b111 of the LED module 1-111 stops and does not consume power.

[0144] Next, when a video signal is output from the LED controller LC, the video detection unit 1c11c within the LED module 1-111 detects the video signal. In response to the video signal being detected by the video detection unit 1c11c, the detection result is output from the video detection unit 1c11c to the switch control unit 1c11d. In response to this detection result, the switch control unit 1c11d sets the switch 1sa11 to the ON position and simultaneously outputs a switch control signal indicating ON from the switch control output terminal 22t-2. Thus, by setting the switch 1sa11 to the ON position, DC power is supplied from the AC / DC power supply unit 1d11 to the LED display unit 1b11, and the LED display unit 1b11 transitions to a state capable of displaying video.

[0145] Furthermore, when a switch control signal indicating that the switch is on is output from the switch control unit 1c11d via the switch control output terminal 22t-2, the switch control signal is supplied to the switch 1sb211 via the switch control input terminal 22t-3. As a result, the switch 1sb211 switches to the on state.

[0146] On the other hand, when a video signal is supplied from the LED controller LC to the LED module 1-111 and to the signal processing unit 1c111, the video processing unit 1c11a generates an LED driving signal based on the video signal and supplies it to the LED display unit 1b11. When DC power is supplied from the AC / DC power supply unit 1d11 and an LED driving signal corresponding to the video signal is supplied from the LED driving signal generation unit 1c11b, the LED display unit 1b11 drives each LED light-emitting unit according to the LED driving signal. Thus, video based on the video signal is displayed on the LED display unit 1b11.

[0147] Additionally, when a video signal is supplied from the LED controller LC to the signal processing unit 1c111 of the LED module 1-11, the signal processing unit 1c111 supplies the video signal to the video signal output terminal 21t-2 via the amplification element 1c11e. The video signal supplied to the video signal output terminal 21t-2 is then supplied to the signal processing unit 1c21 via the video signal input terminal 21t-3 of the LED module 1-21.

[0148] On the other hand, when the switch 1sb211 in the LED module 1-211 is turned on, the AC power supplied from the power input terminal 23t-3 is supplied to the AC / DC power supply unit 1d21, and the DC power supply unit 1d21 supplies DC power to the signal processing unit 1c211.

[0149] The signal processing unit 1c211 within the LED module 1-211 starts operating in response to being supplied with power. The signal processing unit 1c211 detects the video signal input via the video signal input terminal 21t-3 through the video detection unit 1c21c, and sets the switch 1sa21 to "on" by outputting a switch control signal from the switch control unit 1c21d to the switch 1sa21. Furthermore, the signal processing unit 1c211 generates an LED drive signal corresponding to the video signal through the LED drive signal generation unit 1c21b, and outputs it to the LED display unit 1b21. Thus, the LED display unit 1b21 displays the video based on the LED drive signal.

[0150] Furthermore, when the switch control unit 1c21d of the LED module 1-211 sets the switch 1sa21 to the ON position, it outputs a switch control signal indicating that the switch is ON from the switch control output terminal 22t-4. As a result, since the switch control signal is supplied to the switch 1sb311, the switch 1sa31 is set to the ON position. Additionally, AC power is supplied to the AC / DC power supply unit 1d31, and DC power is supplied from the AC / DC power supply unit 1d31 to the signal processing unit 1c311.

[0151] Subsequently, power is supplied to the LED modules in the same order with time differences to display the video corresponding to the video signal.

[0152] Figure 7 It means Figure 6 The diagram shows the situation where the video signal supply stops in the LED display system Sb.

[0153] When AC power is supplied from the distribution panel DB, the LED module 1-11 is in a power-supplying state. That is, it is in a state where AC power is supplied to the AC / DC power supply section 1d11 inside the LED module 1-11.

[0154] Furthermore, when outputting video signals from the LED controller LC, the switches (1sa11, 1sb11, 1sa21, 1sb21, 1sa31, 1sb31) in all cascaded LED modules (1-11, 1-21, 1-31) are in the ON state.

[0155] Here, when the video signal from the LED controller LC stops, the video detection unit 1c11c stops detecting the video signal, and therefore the switches 1sa11 and 1sb11 in the LED module 1-11 switch to the open state. Furthermore, because switch 1sa11 switches to the open state, the AC power supply to the subsequent LED modules 1-21, 1-31, and beyond stops.

[0156] Furthermore, as the video signal from the LED controller LC stops, the switch 1sb11 of the LED module 1-11 also switches to the off state, so no DC power is supplied to the LED display unit 1b11 of the LED module 1-11, and therefore no power consumption occurs in the LED display unit 1b11.

[0157] Therefore, the only part that operates (consumes power) is the signal processing unit 1c11 within LED module 1-11. That is, even when AC power is supplied from the distribution panel DB, the AC / DC power supply unit 1d11 of LED module 1-11 converts the AC power to DC power and supplies DC power to the signal processing unit 1c11, but does not supply power from LED module 1-11 to subsequent LED modules (1-21, etc.). Therefore, the power consumption is limited to the signal processing unit 1c11 within LED module 1-11; no power is consumed in the LED display unit 1b11, and neither are the LED modules 1-21 and later.

[0158] Here, when the video signal is output from the LED controller LC, the switches (1sa11, 1sb211, 1sa311, 1sa21, 1sa31, etc.) in all cascaded LED modules 1 are turned on.

[0159] On the other hand, when the supply of video signal from LED controller LC stops, the video detection unit 1c11c in LED module 1-11 detects that there is no video signal, and then the switch control unit 1c11d sets switch 1sa11 to open, and at the same time sets switch 1sb211 in LED module 1-21 to open.

[0160] When switch 1sb211 is set to open, the AC power supply to AC / DC power supply unit 1d21 is cut off, thus LED module 1-21 stops operating. With LED module 1-21 ceasing operation, no switch control signal is supplied to switch 1sbb311 within LED module 1-31, therefore switch 1sbb311 becomes open, stopping the AC power supply to LED module 1-31, and LED module 1-31 stops operating.

[0161] Then, following the same sequence, stop supplying AC power to the AC / DC power supply section of the cascaded LED module 1 and stop the operation.

[0162] In addition, since the switch 1sa11 of LED module 1-111 is also set to open, no power is supplied to the LED display unit 1b11 of LED module 1-111, and therefore no power consumption is generated in the LED display unit 1b11.

[0163] Here, the parts that operate (generate power consumption) are the signal processing unit 1c111 and the AC / DC power supply unit 1d11 within the LED module 1-11.

[0164] Third implementation method

[0165] In the third embodiment, there are two types of LED module structures.

[0166] Figure 8 This is a schematic functional block diagram showing the structure of LED modules 1-112 of type 1. Figure 9 This is a schematic functional block diagram representing the structure of LED modules 1-113 of the second type.

[0167] Regarding LED modules 1-112 and 1-113, for structures corresponding to LED modules 1-111 in the second embodiment, the same functions are labeled with the same number and their descriptions are omitted, while different functions are labeled with different numbers and described.

[0168] LED module 1-112A is an example of an LED module connected to the primary side.

[0169] LED module 1-112A has an AC / DC power supply unit 1d111 and an AC / DC power supply unit 1d112. When switch 1sa112 is turned on, AC / DC power supply unit 1d111 generates DC power capable of driving LED display unit 1b111 from AC power supplied from the power path.

[0170] The AC / DC power supply unit 1d112 converts the AC power supplied from the power path connecting the power input terminal 23t-1 and the power output terminal 23t-2 into DC power, and supplies DC power to at least the signal processing unit 1c111.

[0171] Since the input terminal of the AC / DC power supply unit 1d112 is connected to the power path, AC power is supplied to the AC / DC power supply unit 1d112 when AC power is supplied to the power input terminal 23t-1. That is, AC power is supplied regardless of whether the various switches in the LED module 1-112A are on or off.

[0172] AC / DC power supply section 1d112 is an example of a primary AC / DC power supply section.

[0173] The AC / DC power supply unit 1d112 generates DC power from AC power to drive the signal processing unit 1c111.

[0174] AC power is input from the distribution panel DB to the power input terminal 23t-1, supplying AC power to the AC / DC power supply unit 1d111. Additionally, the AC power supplied to the power input terminal 23t-1 is also supplied to the AC / DC power supply unit 1d111 via the switch 1sb112 when the switch 1sb112 is on, and output from the power output terminal 23t-2 to the LED module 1-112B located in the next stage.

[0175] The video signal output from the LED controller LC is input to the video signal input terminal 21t-1 and supplied to the signal processing unit 1c111.

[0176] The signal processing unit 1c111 includes a video processing unit 1c11a, an LED drive signal generation unit 1c11b, a video detection unit 1c11c, a switch control unit 1c11d, and an amplification element 1c11e. The signal processing unit 1c111 performs video processing on the input video signal and simultaneously outputs a switch control signal to the LED module 1-112B configured in the next stage via the switch control output terminal 22t-2.

[0177] The video detection unit 1c11c detects whether video exists in the input video signal and outputs the detection result to the switch control unit 1c11d2. When the switch control unit 1c11d receives the detection result indicating whether video exists in the video signal from the video detection unit 1c11c, it outputs a switch control signal to switch 1sb12 and switch 1sb112 to set switch 1sb12 to be on or off based on the detection result, and outputs the switch control signal from the switch control output terminal 22t-2.

[0178] The video processing unit 1c11a extracts the video portion displayed by its own LED module 1-112A from the video signal, performs video processing on the extracted video portion, and outputs it to the LED drive signal generation unit 1c11b.

[0179] The LED drive signal generation unit 1c11b generates an LED drive signal based on the video signal that has undergone video processing and is input from the video processing unit 1c11a, and outputs it to the LED display unit 1b111.

[0180] The LED display unit 1b111 drives each LED light-emitting unit according to the LED drive signal output from the LED drive signal generation unit 1c11b. As a result, video based on video signals is displayed on the LED display unit 1b11.

[0181] The video detection unit 1c11c determines (detects) whether a video signal is input from the video signal input terminal 21t-1 (the presence or absence of the video signal), and outputs its determination result to the switch control unit 1c11d2.

[0182] In response to the video detection unit 1c11d2 detecting a video signal, the switch control unit 1c11d2 supplies a switch control signal (third switching control signal) to the LED module 1-112B connected to the LED module 1-112A (primary LED module). This switch control signal causes the 1sb112 (second switch) of the LED module 1-112B to switch.

[0183] exist Figure 9 In LED module 1-112B, for the... Figure 5 The LED modules 1-111 have the same functional label, mainly indicating different structures. LED module 1-112B is an example of an LED module connected to the second level or later.

[0184] LED module 1-112B is from Figure 5 The structure of switch 1sa112 is excluded in LED module 1-111.

[0185] in addition, Figure 8 LED module 1-112A has a structure with two AC / DC power supplies and a structure that outputs switch control signals from switch control unit 1c11d2 to two switches. However, LED module 1-112B is different in that it has a structure with one AC / DC power supply unit 1d11 and a structure that outputs switch control signals from switch control unit 1c11d1 to one switch 1sb12.

[0186] In LED module 1-112B, when switch 1sb112 is on, the AC / DC power supply unit 1d11 converts the AC power supplied from power input terminal 23t-1 into DC power and supplies it to signal processing unit 1c111 and the first terminal of switch 1sb12. Conversely, when switch 1sb112 is off, the AC / DC power supply unit 1d11 converts the AC power supplied from power input terminal 23t-1 into DC power and supplies it to signal processing unit 1c111 and the first terminal of switch 1sb12.

[0187] AC power from the LED module located in the previous stage is input to the power input terminal 23t-1. This AC power is supplied to the AC / DC power supply unit 1d11 via the switch 1sb112, which is controlled by the switch control signal input to the switch control input terminal 22t-1, and is also supplied from the power output terminal 23t-2 to the power input terminal of the LED module located in the next stage.

[0188] The video signal output from the LED module configured in the front stage is input to the video signal input terminal 21t-1 and supplied to the signal processing unit 1c111.

[0189] The signal processing unit 1c111 consists of a video detection unit, a switch control unit, a video processing unit, and an LED drive signal generation unit. It performs video processing on the input signal and outputs a signal from the signal output unit to the LED module configured in the next stage.

[0190] The signal processing unit 1c111 includes a video processing unit 1c11a, an LED drive signal generation unit 1c11b, a video detection unit 1c11c, a switch control unit 1c11d1, and an amplification element 1c11e. The signal processing unit 1c111 performs video processing on the input video signal and simultaneously outputs a switch control signal to the LED module 1-112B configured in the next stage via the switch control output terminal 22t-2.

[0191] In the video detection unit 1c11c, the presence of video in the input video signal is detected, and the detection result is output to the switch control unit 1c11d1 to set the switch 1sb12 to be on or off. At the same time, the detection result is supplied from the switch control output terminal 22t-2 to the LED module connected to the next stage.

[0192] The video processing unit 1c11a extracts the video portion displayed by its own LED module 1-112A from the video signal, performs video processing on the extracted video portion, and outputs it to the LED drive signal generation unit 1c11b.

[0193] The LED drive signal generation unit 1c11b generates an LED drive signal based on the video signal that has undergone video processing and is input from the video processing unit 1c11a, and outputs it to the LED display unit 1b111.

[0194] The LED display unit 1b111 drives each LED light-emitting unit according to the LED drive signal output from the LED drive signal generation unit 1c11b. As a result, video based on video signals is displayed on the LED display unit 1b11.

[0195] Figure 10 This is a diagram showing the structure of the LED display system Sc. In the LED display system Sc, two LED modules (1-212B and 1-312B) are connected in series in the column (vertical direction) relative to LED module 1-112A.

[0196] In this figure, since LED module 1-212B and LED module 1-312B have the same function as LED module 1-112B, the corresponding structures are labeled with the same name, some of the labels are changed, and the different functions are mainly explained.

[0197] The primary LED module 1-112A is connected to the LED controller LC and the distribution panel DB. Additionally, while the LED module 1-112A is receiving AC power from the distribution panel DB, it also supplies AC power to the AC / DC power supply unit 1d112 via the power input terminal 23t-1. Therefore, DC power is supplied from the AC / DC power supply unit 1d112 to the signal processing unit 1c111 of the LED module 1-112A, thus enabling the signal processing unit 1c111 to operate.

[0198] When AC power is supplied from the distribution panel DB and no video signal is supplied from the LED controller LC via the video signal input terminal 21t-1, the video detection unit 1c11c does not detect a video signal. Based on this detection result, the switch control unit 1c11d sets switches 1sb12 and 1sb112 to open, and simultaneously outputs a switch control signal via the switch control output terminal 22t-2. Therefore, switch 1sb212 of the LED module 1-212B is set to open based on the switch control signal. Consequently, the supply of AC power from the power input terminal 23t3 to the AC / DC power supply unit 1d21 is cut off, and no power is consumed in the LED module 1-211B.

[0199] Furthermore, since no AC power is supplied to LED module 1-212B, no switch control signal is output from the switch control unit 1c21d of LED module 1-212B to the switch 1sb312 of LED module 1-311B. Therefore, the AC power supply to the AC / DC power supply unit 1d31 of LED module 1-312B is cut off, and no power is consumed in LED module 1-312B.

[0200] Even when LED module 1-312B is connected to subsequent LED modules, these subsequent LED modules do not consume power.

[0201] On the other hand, when AC power is supplied from the distribution panel DB and a video signal is supplied from the LED controller LC via the video signal input terminal 21t-1, the video detection unit 1c11c of the LED module 1-112A detects the video signal. In response to the detection of the video signal, the switch control unit 1c11d sets switches 1sa112 and 1sb12 to be turned on, and simultaneously supplies a switch control signal to switch 1sb212 via the switch control output terminal 22t-2 and the switch control input terminal 22t-3, thus turning on switch 1sb212.

[0202] Furthermore, the video processing unit 1c11a of the LED module 1-112A extracts the video portion displayed by its own LED module 1-112A from the input video signal, performs video processing on the extracted video portion, and outputs it to the LED drive signal generation unit 1c11b. The LED drive signal generation unit 1c11b generates an LED drive signal based on the video signal input from the video processing unit 1c11a after video processing, and outputs it to the LED display unit 1b11. When DC power is supplied from the AC / DC power supply unit 1d111 and an LED drive signal corresponding to the video signal is supplied from the LED drive signal generation unit 1c11b, the LED display unit 1b11 drives each LED light-emitting part according to the LED drive signal. Thus, video based on the video signal is displayed on the LED display unit 1b11.

[0203] In addition, the signal processing unit 1c211 outputs the video signal supplied from the video signal input terminal 21t-3 to the signal processing unit 1c211 of the LED module 1-212B via the amplification element 1c11e, through the video signal output terminal 21t-2 and the video signal input terminal 21t-3.

[0204] Next, in LED module 1-212B, when switch 1sb212 is set to turn on, AC / DC power supply unit 1d21 starts up and supplies DC power to signal processing unit 1c211 and the first terminal of switch 1sb22.

[0205] When AC power is supplied to LED module 1-112A, a switch control signal is input from switch control input terminal 22t-3, and a video signal is input from video signal input terminal 21t-3, the signal processing unit 1c211 of LED module 1-112A detects the video signal, sets switch 1sb22 to be turned on, and simultaneously supplies a switch control signal to switch 1sb312 via switch control output terminal 22t-4 and switch control input terminal 22t-5, setting switch 1sb312 to be turned on.

[0206] Furthermore, the signal processing unit 1c211 of the LED module 1-212B extracts the video portion displayed by its own LED module 1-212B from the input video signal, performs video processing on the extracted video portion, generates an LED driving signal, and outputs it to the LED display unit 1b21. When DC power is supplied from the AC / DC power supply unit 1d21 and an LED driving signal corresponding to the video signal is supplied from the LED driving signal generation unit 1c21b, the LED display unit 1b21 drives each LED light-emitting part according to the LED driving signal. Thus, video based on the video signal is displayed on the LED display unit 1b21.

[0207] When switch 1sb212 is turned on, supplying AC power to AC / DC power supply unit 1d21, AC / DC power supply unit 1d21 starts up and supplies DC power to signal processing unit 1c211. As a result, video detection unit 1c21c in LED module 1-212B detects the video signal, and switch control unit 1c21d turns on switch 1sb22. Simultaneously, it turns on switch 1sb312 of LED module 1-312B via switch control output terminal 22t-4 and switch control input terminal 22t-5.

[0208] Subsequently, power is supplied to the subsequent LED modules in the same order with time differences. The LED modules start up and display the video corresponding to the video signal.

[0209] Next, in the video signal output from the LED controller LC, when the video signal disappears, the video detection unit 1c11c of the LED module 1-112A detects the absence of a video signal and outputs the detection result to the switch control unit 1c11d. When the switch control unit 1c11d receives the detection result indicating the absence of a video signal, it sets switches 1sb12 and 1sa112 to open, and simultaneously sets switch 1sb212 of the LED module 1-211B to open.

[0210] When switch 1sb11 is set to open, the DC power supply to LED display unit 1b11 is cut off. As a result, no more power is consumed in LED display unit 1b11.

[0211] Furthermore, in response to the switch 1sa112 being set to open, the supply of AC power to the AC / DC power supply unit 1d111 is cut off. As a result, no more power consumption occurs in the AC / DC power supply unit 1d111.

[0212] LED module 1-212B stops operating in response to the interruption of AC power supply to AC / DC power supply unit 1d21. Therefore, LED module 1-211B no longer consumes power.

[0213] Furthermore, regarding LED module 1-312B, when LED module 1-211B stops working, since no switch control signal is supplied from LED module 1-211B, switch 1sb312 is set to open. Consequently, in response to the cutting off of AC power supply to AC / DC power supply unit 1d31, AC / DC power supply unit 1d31 stops working, LED module 1-311B as a whole stops working, and LED module 1-312B no longer consumes power.

[0214] When LED module 1 is connected at a position after LED module 1-312B, all subsequent LED modules will stop working.

[0215] At this time, the signal processing unit 1c111 and the AC / DC power supply unit 1d112 of the primary LED module 1-112A are working, but the operation of other units is stopped.

[0216] Implementation Method 4

[0217] Figure 11 This is a diagram showing the structure of an LED display system Sd. The LED display system Sd... Figure 10 In the LED display system Sc shown, LED module 1-112B is provided instead of LED module 1-112A, and LED controller LCA is provided instead of LED controller LC.

[0218] Because LED module 1-112B has the same Figure 9 The LED modules 1-112B shown have the same function, so the corresponding structures are labeled with the same name, some of the labels are changed, and the different functions are mainly explained.

[0219] In multiple LED modules, the switch 1sa112 (second switch) of the primary LED module 1-112B is switched to supply AC power to the AC / DC power supply unit from the power path via a control signal supplied from an external device (e.g., LED controller LCA). This control signal is described as being supplied from the LED controller LCA, but it can also be supplied from a device different from the LED controller LCA.

[0220] The LED controller LCA has the same functions as in the first to third embodiments. Furthermore, when supplying a video signal to the video signal input terminal 21t-1 of the LED module 1-112B, the LED controller LCA supplies a switch control signal to the switch control input terminal 22t-1 of the LED module 1-112B to turn on the switch 1sa112. Conversely, when ceasing to supply a video signal to the video signal input terminal 21t-1 of the LED module 1-112B, the LED controller LCA supplies a switch control signal to the switch control input terminal 22t-1 of the LED module 1-112B to turn off the switch 1sa112.

[0221] In the LED display system Sc of the third embodiment, DC power is continuously supplied from the distribution panel DB to the AC / DC power supply unit 1d112 of the LED modules 1-112A. However, in the LED display system Sd of the fourth embodiment, the switch 1sa112 of the LED modules 1-112B is switched on or off based on a switch control signal supplied from the LED controller LCA. Therefore, in response to the supply of a video signal from the LED controller LCA, the switch 1sa112 switches on, thereby enabling the supply of AC power to the AC / DC power supply unit 1d11. Conversely, in response to the cessation of the supply of a video signal from the LED controller LCA, the switch 1sa112 switches off, thereby enabling the cut-off of the AC power supply to the AC / DC power supply unit 1d11.

[0222] Here, in Figure 10 In the LED display system Sc shown, the primary LED module 1-112A is equipped with two AC / DC power supply sections: AC / DC power supply section 1d111 and AC / DC power supply section 1d112. Figure 11 In the LED display system Sd shown, the primary LED module 1-112B only needs to have one AC / DC power supply unit 1d11. Therefore, even the primary LED module in the LED display system Sd can use LED modules with the same structure as the next and subsequent LED modules. Thus, it is not necessary to increase the variety of LED modules required to construct an LED display system.

[0223] According to the first to third embodiments described above, power can be supplied or cut off based on whether a video signal is detected in the LED module, without the need for direct operation of the distribution panel (DB). Therefore, power consumption can be managed simply.

[0224] Furthermore, according to the second and third embodiments, when no video signal is output from the video source device, only the signal processing unit of the primary LED module connected to the LED controller needs to operate, so that power can be supplied to other LED modules without reducing power consumption when no video is displayed in the LED display system.

[0225] For example, when no video signal is supplied to the LED display and the LED display is not displaying video, simply cutting off the video signal by turning off the power to the video source device still supplies power to the LED module. Although the LED panel is in an off state, the signal processing unit within the LED module becomes active, resulting in useless power consumption. However, according to the second and third embodiments, when no video signal is output from the video source device, as long as the signal processing unit of the primary LED module connected to the LED controller is working, the signal processing units of subsequent LED modules and the LED panels do not need to be driven, thus reducing power consumption.

[0226] Furthermore, in embodiments 2 through 4, the signal processing unit of each LED module can also perform power supply processing to the downstream LED module after supplying a video signal to the downstream LED module when the video signal is supplied from the upstream LED module or LED controller LC. Moreover, the signal processing unit of each LED module can also display video based on the video signal on the LED display unit.

[0227] In addition, each LED display unit of each LED module can adjust the timing after supplying a video signal from the LED controller LC to the LED display LD, so that the video corresponding to the video signal is displayed simultaneously.

[0228] Furthermore, when power is supplied to each LED module, a time difference can be set for each LED module to initiate the power supply. This disperses the timing of surge current generation in each LED module, thus preventing the distribution panel from tripping (cutting off) and allowing for a smooth initiation of power supply.

[0229] Furthermore, the more LED modules that make up an LED display, the greater the power consumption that can be reduced when no video signal is detected.

[0230] The embodiments described above illustrate a case where the LED modules are arranged in series vertically relative to the primary LED module. However, they can also be arranged in series horizontally relative to the primary LED module. For example, the video signal input terminals and power input terminals can be arranged along a first vertical side around the perimeter of the LED modules, and the signal output terminals and power output terminals can be arranged along a second vertical side. This allows multiple LED modules to be connected in series horizontally.

[0231] Alternatively, for example, the video signal input terminals, switch control input terminals, and power input terminals can be arranged along the first vertical side of the perimeter of the LED module, and the signal output terminals, switch control output terminals, and power output terminals can be arranged along the second vertical side. This allows multiple LED modules to be connected in series horizontally.

[0232] Alternatively, it can be used to implement Figure 1 The functions of the processing unit are recorded on a computer-readable medium, which the computer system reads and executes to perform construction management. It should be noted that the "computer system" mentioned here includes hardware such as the operating system and peripheral devices.

[0233] In addition, when using a WWW system, "computer system" also includes the homepage providing environment (or display environment).

[0234] Furthermore, "computer-readable recording media" refers to portable media such as floppy disks, optical disks, ROM (read-only memory), and CD-ROM (read-only optical disc storage), as well as storage devices such as hard disks built into computer systems. Further, "computer-readable recording media" also includes volatile memory within a computer system, such as servers or clients, that retains program content for a certain period of time. Additionally, the aforementioned program can be a program that is part of the program to achieve the aforementioned functions, or it can be a program that combines with programs already recorded in the computer system to achieve the aforementioned functions. Alternatively, the aforementioned program can be stored on a designated server and distributed (downloaded, etc.) via communication lines upon request from other devices.

[0235] 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 include designs that do not depart from the spirit of the present invention.

[0236] Label Explanation

[0237] LED modules 1-11, 1-111, 1-111A, 1-112, 1-112A, 1-112B, 1-113, 1-12, 1-13, 1-14, 1-15, 1-16, 1-17, 1-18, 1-19, 1-1m, 1-20, 1-21, 1-211, 1-211b, 1-211B, 1-212B, 1-22, 1-23, 1-24, 1-25, 1-26, 1-27, 1-28, 1-29, 1-30, 1-31, 1-311, 1-311B, 1-312B, 1-n1, 1-311B

[0238] LED display units 1b11, 1b21, 1b31, and 1b111

[0239] Switches 1sb111, 1sb112, 1sb12, and 1sb21

[0240] 1C11C and 1C21C Video Detection Department

[0241] 1c11a Video Processing Department

[0242] Signal processing units: 1C11, 1C31, 1C311, 1C111

[0243] 1C11B LED Driver Signal Generation Unit

[0244] 1c11d, 1c11d1, 1c11d2 Switch control unit

[0245] 1C11E Amplifying Element

[0246] 1C21B LED Driver Signal Generation Unit

[0247] 1C21D Switch Control Unit

[0248] 1C21E Amplifying Component

[0249] AC / DC power supply section of 1d11, 1d11, 1D11, 1d111, 1d112, 1d21, 1d31

[0250] 1EB, 1EB1 electrical circuit board

[0251] 1da11, 1da21, 1sa, 1sa11, 1sa112, 1sa21, 1sa31, 1sb, 1sb11, 1sb211, 1sb212, 1sb22, 1sb31, 1sb311, 1sb312, 1sbb311 Switch

[0252] 21t-1, 21t-3, 21t-5 Video signal input terminals

[0253] 21t-2 and 21t-4 video signal output terminals

[0254] 22t-1, 22t-3, 22t-5 switch control input terminals

[0255] 22t-2, 22t-4 switch control output terminals

[0256] 23t-1, 23t-3, 23t-5 Power Input Terminals

[0257] 23t-2, 23t-4 power output terminals

[0258] DB distribution panel

[0259] LC, LCA LED controller

[0260] LD LED Display

[0261] LDP LED panel

[0262] PC power cables

[0263] S, Sa, Sb, Sc, Sd LED display systems

[0264] SC signal cable

[0265] VS video source device

Claims

1. An LED display device comprising a plurality of LED modules arranged thereon, wherein, The LED module has: The display section is equipped with multiple LED components; The signal processing unit displays video based on a video signal supplied from an external device on the display unit; The power input port allows AC power to be input from the outside. The power output port can supply the AC power input to the power input port to the subsequent LED module; The AC / DC power supply unit converts the AC power supplied from the power path connecting the power input port and the power output port into DC power, and supplies the DC power to at least the signal processing unit; The first switch is located in the power path and switches whether to supply AC power input to the power input port to the power output port. The video signal input port is where the video signal is input; The video output port is capable of supplying the video signal input to the video signal input port to the subsequent LED module; as well as The switch control unit, in response to the signal processing unit detecting the video signal, supplies a first switching control signal to the first switch, the first switching control signal causing the first switch to switch to supply AC power input to the power input port to the power output port.

2. The LED display device according to claim 1, wherein, After the signal processing unit supplies the video signal to the subsequent LED module, The switch control unit causes the first switch to supply the AC power to the power output port. The signal processing unit displays video based on the video signal on the display unit.

3. An LED display device comprising a plurality of LED modules, wherein, The LED module has: The display section is equipped with multiple LED components; The signal processing unit displays video based on the video signal supplied from the front-end LED module on the display unit; The power input port receives AC power from the preceding LED module; The power output port can supply the AC power input to the power input port to the subsequent LED module; The AC / DC power supply unit converts the AC power supplied from the power path connecting the power input port and the power output port into DC power, and supplies the DC power to at least the signal processing unit; The second switch switches whether to supply AC power from the power path to the AC / DC power supply unit. The video signal input port is where the video signal is input; as well as The video output port is capable of supplying the video signal input to the video signal input port to the subsequent LED module. The second switch, via a second switching control signal input from the preceding LED module, switches to supply AC power from the power path to the AC / DC power supply unit. The LED module also has a switch control unit, which, in response to the signal processing unit detecting the video signal, supplies a third switching control signal to the subsequent LED module, which causes the second switch of the subsequent LED module to switch.

4. The LED display device according to claim 3, wherein, After the signal processing unit supplies the video signal to the subsequent LED module, The switch control unit supplies the third switching control signal to the downstream LED module. The signal processing unit displays video based on the video signal on the display unit.

5. The LED display device according to claim 3, wherein, The primary LED module among the plurality of LED modules has a fourth switch, which toggles whether to bypass the second switch. The fourth switch supplies AC power from the power path to the AC / DC power supply unit by switching to bypass the second switch.

6. The LED display device according to claim 3, wherein, The primary LED module among the plurality of LED modules has: The display unit; The signal processing unit; The power input port allows AC power to be input from the outside. The power output port can supply the AC power input to the power input port to the subsequent LED module; The video signal input port receives video signals supplied from external devices. The video output port is capable of supplying the video signal input to the video signal input port to the subsequent LED module; The primary AC / DC power supply unit converts the AC power supplied from the power path connecting the power input port and the power output port into DC power, and supplies the DC power to at least the signal processing unit; and The switch control unit, In response to the signal processing unit of the primary LED module detecting the video signal, the switch control unit of the primary LED module supplies a third switching control signal to the subsequent LED module connected to the primary LED module. The third switching control signal causes the second switch of the LED module connected to the subsequent LED module to switch.

7. The LED display device according to claim 3, wherein, The second switch of the primary LED module in the plurality of LED modules is switched by a control signal supplied from an external device to supply AC power from the power path to the AC / DC power supply unit.

8. The LED display device according to any one of claims 1 to 6, wherein, The signal processing unit operates in response to the input of DC power from the AC / DC power supply unit, thereby supplying the video signal input to the video signal input port to the subsequent LED module from the video output port.

9. The LED display device according to any one of claims 1 to 8, wherein, The LED display device also includes a fifth switch, which toggles whether DC power is supplied from the AC / DC power supply unit to the display unit. The signal processing unit operates in response to the input of DC power from the AC / DC power supply unit, thereby supplying a fourth switching control signal to the fifth switch, which causes the fifth switch to switch to supply DC power from the AC / DC power supply unit to the display unit.

10. The LED display device according to claim 9, wherein, In response to the signal processing unit not detecting the video signal, the switch control unit supplies a fourth switching control signal to the fifth switch, which causes the fifth switch to switch off from supplying DC power from the AC / DC power supply unit to the display unit.

11. A control method for an LED display device, the LED display device having a plurality of LED modules arranged thereon, the LED modules having: The display section is equipped with multiple LED components; The signal processing unit displays video based on a video signal supplied from an external device on the display unit; and The first switch toggles whether to supply AC power from the external source to the LED module connected to the downstream stage. in, The externally supplied AC power is converted into DC power and supplied to the signal processing unit. When the DC power is supplied, the signal processing unit will supply the externally input video signal to the subsequent LED module. In response to detecting the video signal, the signal processing unit supplies a first switching control signal to the first switch, which causes the first switch to switch to supply the AC power to the subsequent LED module.

12. A control method for an LED display device, the LED display device having a plurality of LED modules arranged thereon, the LED modules having: The display section is equipped with multiple LED components; The signal processing unit displays video based on the video signal supplied from the front-end LED module on the display unit; and The second switch toggles whether to supply AC power from the preceding LED module to the AC / DC power supply unit. in, The second switch, in response to a switching control signal supplied from the preceding LED module, switches to supplying the AC power to the AC / DC power supply unit. The AC power is converted into DC power by the AC / DC power supply unit and supplied to the signal processing unit. When the DC power is supplied, the signal processing unit will supply the externally input video signal to the subsequent LED module. In response to detecting the video signal, the signal processing unit supplies a third switching control signal to the subsequent LED module, which causes the second switch of the subsequent LED module to switch.

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