LED control device and LED control system

Abstract

The utility model relates to an LED control device and an LED control system. The LED control device comprises a control assembly, a switching assembly, a first interface, a second interface and a cascade interface. The first interface accesses a first data signal or the second interface accesses a second data signal; the switching assembly is respectively connected with the first interface, the second interface and the control assembly and is used for transmitting the first data signal or the second data signal to the control assembly; the control assembly is connected with the cascade interface and the display device and is used for controlling the display device to display according to the first data signal or the second data signal; and converting the first data signal into a second data signal, and transmitting the second data signal to the outside through the cascade interface. A sending card and a receiving card are replaced by the LED control devices, and the LED control devices are sequentially cascaded through the cascade interfaces, so that the overall wiring complexity is simplified, data loss is further avoided, and the data transmission stability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LED display, in particular to an LED control device and an LED control system. BACKGROUND

[0002] A small-pitch LED display screen is a display device using high-density LED (light-emitting diode) technology, and the distance between pixels is very small, usually 2.5 mm or less. Common small-pitch LED display screens mainly include P2.5, P2.083, P1.923, P1.8, P1.667, P1.5, P1.25 and P1.0, etc. Here, "P" represents the pixel pitch, in millimeters, referring to the distance between the centers of two adjacent LED beads. Small-pitch LED display screens are often used in conference rooms, command centers, exhibition halls and other places with high requirements for display picture fineness.

[0003] In the related art, a small-pitch LED display system includes a signal source, a sending card, a receiving card and a display screen. The sending card is arranged at the signal source, and the receiving card is arranged at the display screen. One sending card needs to be connected with multiple receiving cards, and the overall wiring of the LED display system is complex, which is prone to data loss and low data transmission stability. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide an LED control device and an LED control system to solve the above technical problems.

[0005] In a first aspect, the present application provides an LED control device, comprising: a control component, a switching component, a first interface, a second interface and a cascade interface; the first interface inputs a first data signal or the second interface inputs a second data signal; the switching component is connected with the first interface, the second interface and the control component respectively, and is used for transmitting the first data signal or the second data signal to the control component; the control component is connected with the cascade interface and a display device respectively, and is used for controlling the display device to display according to the first data signal or the second data signal; and converting the first data signal into the second data signal and transmitting it to the outside through the cascade interface.

[0006] In one embodiment, the first data signal input by the first interface includes an HDMI data signal; and the second data signal input by the second interface includes a high-speed digital signal.

[0007] In one of the embodiments, the switching component comprises a switching control circuit and a high-speed switching component; an input of the switching control circuit is connected with the first interface, and an output of the switching control circuit is connected with a control terminal of the high-speed switching component; the switching control circuit is configured to generate a control signal according to the access state of the first interface and transmit the control signal to the high-speed switching component; a first input of the high-speed switching component is connected with the first interface, and a second input of the high-speed switching component is connected with the second interface; an output of the high-speed switching component is connected with the control component; the high-speed switching component is configured to, according to the control signal, select the first input of the high-speed switching component and the output of the high-speed switching component, and transmit the first data signal to the control component; or according to the control signal, select the second input of the high-speed switching component and the output of the high-speed switching component, and transmit the second data signal to the control component.

[0008] In one of the embodiments, the switching control circuit comprises a switch tube and a first resistor; a control terminal of the switch tube is connected with a power supply contact of the first interface, a first terminal of the switch tube is connected to a power supply through the first resistor, and a second terminal of the switch tube is grounded; a control terminal of the high-speed switching component is connected to a connection point of the first terminal of the switch tube and the first resistor.

[0009] In one of the embodiments, the switching control circuit further comprises a second resistor and a third resistor; one end of the second resistor is connected with the power supply contact of the first interface, and the other end of the second resistor is grounded through the third resistor; a control terminal of the switch tube is connected to a connection point of the second resistor and the third resistor.

[0010] In one of the embodiments, the switch tube comprises a MOS tube or a triode.

[0011] In one of the embodiments, the control component and the switching component are connected through a high-speed serial digital video transmission channel; the control component and the cascaded interface are connected through a high-speed serial digital video transmission channel.

[0012] In one of the embodiments, the first interface is an HDMI interface; the second interface is an RJ45 interface; and the cascaded interface is an RJ45 interface.

[0013] In a second aspect, the application further provides an LED control system, comprising: a signal source and a plurality of LED control devices according to any one of the first aspect; the plurality of LED control devices are cascaded in sequence; the signal source is connected with a first interface of a first LED control device in the sequence; in every two of the LED control devices in the sequence, a cascaded interface of a former LED control device is connected with a second interface of a latter LED control device.

[0014] In one embodiment, each of the LED control devices is connected to a display device.

[0015] The LED control device and the LED control system, wherein the LED control device comprises a control component, a switching component, a first interface, a second interface and a cascade interface. The first interface is connected to a first data signal or the second interface is connected to a second data signal. The switching component is connected to the first interface, the second interface and the control component, for transmitting the first data signal or the second data signal to the control component. The control component is connected to the cascade interface and a display device, for controlling the display device to display according to the first data signal or the second data signal, and converting the first data signal into the second data signal and transmitting the second data signal to the outside through the cascade interface. The LED control device replaces the sending card and the receiving card, and the LED control devices are connected in sequence through the cascade interface, so as to simplify the overall wiring complexity, further avoid data loss and improve data transmission stability. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a structural diagram of the LED control device in one embodiment;

[0017] Figure 2 FIG. 2 is a structural diagram of the LED control device in another embodiment;

[0018] Figure 3 FIG. 3 is a structural diagram of the switching control circuit in one embodiment;

[0019] Figure 4 FIG. 4 is a structural diagram of the LED control device in one specific embodiment;

[0020] Figure 5 FIG. 5 is a flowchart of the control method of the LED control device in one embodiment;

[0021] Figure 6 FIG. 6 is a structural diagram of the LED control system in one embodiment.

[0022] Reference signs: 10, LED control device; 100, control component; 200, switching component; 210, switching control circuit; Q1, switch tube; R1, first resistor; R2, second resistor; R3, third resistor; 220, high-speed switching component; 300, first interface; 400, second interface; 500, cascade interface; 20, display device; 30, signal source. DETAILED DESCRIPTION

[0023] For the purpose of clarity, the present application will be described in greater detail below with reference to the accompanying drawings. The embodiments of the present application are shown in the drawings. However, the present application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0025] It should be understood that the terms "first", "second" and the like used herein are used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. For example, without departing from the scope of the present application, the first resistor can be referred to as the second resistor, and similarly, the second resistor can be referred to as the first resistor. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0026] It should be understood that "connection" in the following embodiments, if the circuits, modules, units and the like connected to each other have transmission of electrical signals or data, should be understood as "electrical connection", "communication connection" and the like.

[0027] It should be understood that "at least one" means one or more, and "multiple" means two or more. "At least part of the element" means part or all of the element.

[0028] Small-pitch LED display screen refers to LED display screen with LED pitch of P2.5 and below, mainly including P2.5, P2.083, P1.923, P1.8, P1.667, P1.5, P1.25, P1.0 and the like. Small-pitch LED display screen is mainly used indoors, such as conference rooms, command centers, exhibition halls and other places with high requirements for display picture fineness. Small-pitch LED display screen has the advantages of high brightness, high contrast and good color restoration, and can provide high-quality visual experience. And small-pitch LED display screen can realize seamless splicing and can be flexibly combined into large screens of various sizes and shapes.

[0029] Existing small-pitch LED display systems mainly consist of the following components: a display screen, a transmitting card, a receiving card, and a signal source. The display screen comprises numerous small-pitch LED beads forming light-emitting pixels. Images are displayed by controlling the brightness and color changes of these pixels. The quality and density of the LED beads directly affect the displayed image quality. The transmitting card receives the video signal generated by the signal source, converts the input video signal into an RJ45 gigabit network signal, and sends the converted RJ45 gigabit network signal to the receiving card. The transmitting card supports multiple video interfaces, such as HDMI and DVI. The receiving card receives the RJ45 gigabit network signal transmitted by the transmitting card, analyzes the RJ45 gigabit network signal, and controls the corresponding LED beads on the display screen to light up or turn off based on the analyzed data, thus completing the video display. The receiving card can achieve precise brightness and color adjustment of the LED beads, ensuring the accuracy of the image display. The signal source can be a computer, Blu-ray player, or video matrix, etc. The signal source provides the video signal to the transmitting card, i.e., the content to be displayed on the display screen, such as video files, images, and PowerPoint presentations. The aforementioned small-pitch LED display system transmits signals through a transmission architecture consisting of a sending card and a transmission card. The sending card is located at the signal source, receives the HDMI signal, converts it into a Gigabit Ethernet signal, and transmits it to the receiving card via an RJ45 interface. The receiving cards are located on the display screen, and one sending card needs to connect to multiple receiving cards. Data transmission between the sending and receiving cards is via Gigabit Ethernet, resulting in low bandwidth. When displaying high-resolution video or having multiple displays, multiple sending cards are required, each connecting to multiple receiving cards. This leads to complex wiring, susceptibility to data loss and low data transmission stability, and excessive cost.

[0030] In one embodiment, such as Figure 1 As shown, an LED control device is provided. The LED control device 10 includes a control component 100, a switching component 200, a first interface 300, a second interface 400, and a cascading interface 500. The first interface 300 receives a first data signal, or the second interface 400 receives a second data signal. The switching component 200 is connected to the first interface 300, the second interface 400, and the control component 100, respectively, and is used to transmit the first data signal or the second data signal to the control component 100. The control component 100 is connected to the cascading interface 500 and a display device 20, respectively, and is used to control the display device 20 to display based on the first data signal or the second data signal; and to convert the first data signal into a second data signal and transmit it externally through the cascading interface 500.

[0031] The LED control device 10 can be a control card. The LED control device 10 can be directly connected with a signal source to acquire a video signal of the signal source. In actual use, a plurality of LED control devices 10 are cascaded, wherein the first LED control device 10 in the cascade is connected to the signal source. The first LED control device 10 acquires the video signal of the signal source, and the acquired video signal is transmitted to the next LED control device 10 through the cascade architecture of the LED control devices 10. Each LED control device 10 is connected with a display device 20, and each LED control device 10 controls the display device 20 to display according to the respective received video signal.

[0032] The LED control device 10 includes a first interface 300 and a second interface 400. When the LED control device 10 is the first LED control device 10 in the cascade architecture, the first interface 300 is connected with the signal source to acquire a first data signal transmitted by the signal source, that is, the first interface 300 accesses the first data signal, wherein the first data signal is the video signal generated by the signal source. When the LED control device 10 is the LED control device 10 other than the first LED control device 10 in the cascade architecture, the second interface 400 is connected with the cascade interface 500 of the previous LED control device 10 to acquire a second data signal transmitted by the previous LED control device 10, that is, the second interface 400 accesses the second data signal, wherein the second data signal is the video signal transmitted by the previous LED control device 10. After the first interface 300 receives the first data signal or the second interface 400 receives the second data signal, the first data signal or the second data signal is transmitted to the switching component 200.

[0033] The switching component 200 is connected with the first interface 300, the second interface 400 and the control component 100. When the first interface 300 accesses the first data signal, the switching component 200 selects the first interface 300 and the control component 100 to transmit the first data signal to the control component 100. When the second interface 400 accesses the second data signal, the switching component 200 selects the second interface 400 and the control component 100 to transmit the second data signal to the control component 100.

[0034] The control component 100 is connected with the cascade interface 500 and the display device 20. The display device 20 can be an LED display screen. After receiving the first data signal or the second data signal, the control component 100 needs to firstly analyze the first data signal or the second data signal and control the display device 20 to display. Then, the first data signal is converted into the second data signal, and the second data signal is transmitted to the second interface 400 of the next level LED control device 10 through the cascade interface 500. The first data signal can be a signal in HDMI data format, and the second data signal can be a signal in high-speed serial communication data format (Serdes). The conversion between the first data signal and the second data signal is only the conversion between data formats, and the conversion mode is a conventional conversion mode, which only needs to be able to convert the HDMI data format into the high-speed serial communication data format, and the embodiment is not limited. If the LED control device 10 is the first LED control device 10 in cascade, the control component 100 receives the first data signal, controls the corresponding display device 20 to display through the first data signal, and then converts the first data signal into the second data signal and transmits the second data signal to the next level LED control device 10 through the cascade interface 500. If the LED control device 10 is the LED control device 10 other than the first LED control device 10 in cascade, the control component 100 receives the second data signal, controls the corresponding display device 20 to display through the second data signal, and then transmits the second data signal to the next level LED control device 10 through the cascade interface 500.

[0035] The LED control device 10 replaces the sending card and the receiving card, and the LED control devices 10 are sequentially cascaded through the cascade interface 500, so as to simplify the overall wiring complexity, further avoid data loss, and improve data transmission stability. The second data signal is transmitted between the cascaded LED control devices 10, so as to improve the data transmission rate.

[0036] In one embodiment, the first data signal accessed by the first interface 300 includes an HDMI data signal, and the second data signal accessed by the second interface 400 includes a high-speed digital signal. The first interface 300 is used to connect a signal source when the corresponding LED control device 10 is the first LED control device 10 in cascade. The output of the signal source is usually an HDMI signal, so the first data signal received by the first interface 300 is an HDMI data signal, that is, a signal in HDMI data format. The second interface 400 is used to connect the LED control devices 10 two by two in cascade. The output of the LED control device 10 in the upper level is the second control signal, so the second control signal received by the second interface 400 is a high-speed digital signal, that is, a signal in high-speed serial communication data format after conversion.

[0037] The transmission of the video data through the high-speed digital signal between the cascaded multiple LED control devices 10 improves the data transmission rate, thereby further improving the display effect of the LED display.

[0038] In one embodiment, as shown in Figure 2 The switching assembly 200 includes a switching control circuit 210 and a high-speed switching assembly 220. The input end of the switching control circuit 210 is connected with the first interface 300, and the output end of the switching control circuit 210 is connected with the control end of the high-speed switching assembly 220. The switching control circuit 210 is configured to generate a control signal according to the access state of the first interface 300 and transmit the control signal to the high-speed switching assembly 220. The first input end of the high-speed switching assembly 220 is connected with the first interface 300, and the second input end of the high-speed switching assembly 220 is connected with the second interface 400. The output end of the high-speed switching assembly 220 is connected with the control assembly 100. The high-speed switching assembly 220 is configured to select the first input end of the high-speed switching assembly 220 and the output end of the high-speed switching assembly 220 according to the control signal, and transmit the first data signal to the control assembly 100, or select the second input end of the high-speed switching assembly 220 and the output end of the high-speed switching assembly 220 according to the control signal, and transmit the second data signal to the control assembly 100.

[0039] The switching control circuit 210 is configured to generate a control signal and transmit the control signal to the high-speed switching component 220. The high-speed switching component 220 is configured to select the first input terminal of the high-speed switching component 220 or the second input terminal of the high-speed switching component 220 to be connected to the output terminal of the high-speed switching component 220 according to the control signal. The input terminal of the switching control circuit 210 is connected to the first interface 300. The switching control circuit 210 is configured to generate the control signal according to the state of the access signal of the first interface 300. The state of the access signal includes an access signal state and a non-access signal state. The control signal includes a high-level signal and a low-level signal. When the state of the access signal of the first interface 300 is the access signal state, the generated control signal is the low-level signal. When the state of the access signal of the first interface 300 is the non-access signal state, the generated control signal is the high-level signal. After the switching control circuit 210 generates the control signal, the switching control circuit 210 transmits the control signal to the high-speed switching component 220. After the high-speed switching component 220 receives the control signal, if the control signal is the low-level signal, i.e., the first interface 300 is in the access signal state, the high-speed switching component 220 selects the first input terminal of the high-speed switching component 220 to be connected to the output terminal of the high-speed switching component 220, i.e., the first interface 300 is connected to the control component 100. If the control signal is the high-level signal, i.e., the first interface 300 is in the non-access signal state, the high-speed switching component 220 selects the second input terminal of the high-speed switching component 220 to be connected to the output terminal of the high-speed switching component 220, i.e., the second interface 400 is connected to the control component 100. The high-speed switching component 220 can be an SGM7302 chip. The first input terminal, the second input terminal, the control terminal, and the output terminal of the high-speed switching component 220 can be pins of the chip.

[0040] The switching control circuit 210 can quickly detect whether the first interface 300 is in the access signal state and control the high-speed switching component 220 to quickly connect the first interface 300 or the second interface 400 to the control component 100, thereby improving the signal switching response speed of the LED control device 10 and further improving the display effect of the LED display.

[0041] In one embodiment, as Figure 3As shown, the switching control circuit 210 comprises a switch tube Q1 and a first resistor R1; the control end of the switch tube Q1 is connected to the power contact of the first interface 300, the first end of the switch tube Q1 is connected to the power supply through the first resistor R1, and the second end of the switch tube Q1 is grounded; and the control end of the high-speed switching component 220 is connected to the connection point of the first end of the switch tube Q1 and the first resistor R1. The switch tube Q1 comprises a MOS tube or a triode, and when the switch tube Q1 is a MOS tube, it can be an NMOS tube or a PMOS tube, and the type of the switch tube Q1 is not limited in the embodiment. Taking the switch tube Q1 as an NMOS tube as an example, the control end of the switch tube Q1 is the gate of the NMOS tube, the first end of the switch tube Q1 is the drain of the NMOS tube, and the second end of the switch tube Q1 is the source of the NMOS tube. The first interface 300 can be an HDMI interface, the HDMI interface is provided with a +5V voltage contact, and the gate of the NMOS tube is connected to the +5V voltage contact of the HDMI interface. The first resistor R1 is a pull-up resistor, the drain of the NMOS tube is connected to the power supply through the pull-up resistor, and the power supply is the power supply of the LED control device 10. The source of the NMOS tube is grounded. When the first interface 300 is in the signal connection state, the +5V voltage contact of the first interface is at a high level, at this time, the gate of the NMOS tube is at a high level, the NMOS tube is turned on, the drain of the NMOS tube is at a low level, the control end of the high-speed switching component 220 is connected to the drain of the NMOS tube, that is, the control signal is a low-level signal, and that is, the first interface 300 is in the signal connection state; when the first interface 300 is in the signal non-connection state, the +5V voltage contact of the first interface is suspended at a low level, at this time, the gate of the NMOS tube is at a low level, the NMOS tube is not turned on, the drain of the NMOS tube is at a high level, the control end of the high-speed switching component 220 is connected to the drain of the NMOS tube, that is, the control signal is a high-level signal, and that is, the first interface 300 is in the signal non-connection state.

[0042] By arranging the switch tube, the connection state of the first interface can be accurately and timely detected, so that the control signal can be quickly responded and output, thereby improving the response speed of the LED control device 10 and further improving the display effect of the LED display.

[0043] In one of the embodiments, as shown in Figure 3 The switching control circuit 210 further comprises a second resistor R2 and a third resistor R3; one end of the second resistor R2 is connected to the power contact of the first interface 300, the other end of the second resistor R2 is grounded through the third resistor R3; and the control end of the switch tube Q1 is connected to the connection point of the second resistor R2 and the third resistor R3. That is, the NMOS tube is connected to the +5V voltage contact of the first interface through the second resistor R2. The second resistor R2 and the third resistor R3 serve as voltage dividing and configuration resistors.

[0044] In one of the embodiments, the control component 100 is connected with the switching component 200 through a high-speed serial digital video transmission channel; the control component 100 is connected with the cascading interface 500 through a high-speed serial digital video transmission channel. The control component 100 can be an FPGA chip or an ASIC chip. By setting the high-speed serial digital video transmission channel, the data transmission rate can be further improved.

[0045] In one of the embodiments, the first interface 300 is an HDMI interface, the second interface 400 is an RJ45 interface, and the cascading interface 500 is an RJ45 interface. In an alternative embodiment, two LED control devices 10 can be connected through HDMI interfaces, that is, the second interface 400 and the cascading interface 500 are both HDMI interfaces. However, according to different splicing modes of the LED display device, the LED control devices 10 can be connected horizontally or vertically. The lengths of the cables required for horizontal and vertical connections are different. For HDMI cables, different cable lengths need to be customized. During the installation of the LED display device, different cables need to be used for different installation positions, which cannot be directly pressed on the installation site, and the installation is not convenient, and the cost is too high. When using the RJ45 interface, the network cable can be adjusted in length by the construction personnel according to the site environment, so that the installation of the LED display device is more convenient, and the cost is reduced because there is no need for special customization. When the HDMI interface is used between two LED control devices 10, the HDMI cable does not have a buckle. When a large number of HDMI interfaces are used for data transmission, the HDMI interface is prone to loosening, resulting in display problems such as screen flickering. When the RJ45 interface is used, the RJ45 interface is connected through a buckle, and the connection is more secure, avoiding the loosening of the interface, further improving the display quality of the LED display device, and avoiding display problems such as screen flickering.

[0046] In one of the embodiments, an LED control device with adaptive data channel switching is provided. The switching component recognizes the access state of the first interface, that is, the access state of the HDMI interface. According to the access state, the first interface is controlled to be selected with the control component, or the second interface is controlled to be selected with the control component, without the need for additional external switches and software control. Figure 4As shown, the LED control device includes a control component 100, a switching control circuit 210, a high-speed switching component 220, a first interface 300, a second interface 400, and a cascading interface 500. The first interface 300 is an HDMI interface, and the second interface 400 and the cascading interface 500 are RJ45 interfaces. The control component 100 can be an FPGA chip or an ASIC chip. The control component 100 is mainly responsible for receiving a first data signal or a second data signal, performing serial-to-parallel conversion on the signal, and parsing the first data signal or the second data signal to obtain an image currently required to be displayed and transmitting the image to a corresponding LED display device for display. The control component 100 receives and transmits data signals through two high-speed serial digital video transmission channels CH1 and CH2, one of which is connected with the cascading interface 500, and the other of which is connected with the high-speed switching component 220. The high-speed switching component 220 is used to select the control component 100 with the first interface 300 or the control component 100 with the second interface 400. The switching control circuit 210 controls the selection of the control component 100 with the first interface 300 and the control component 100 with the second interface 400 by identifying the access state of the first interface 300. The RJ45 interface includes four pairs of high-speed digital differential data lines, and the HDMI interface includes three pairs of data lines and one pair of clock lines. After the first interface 300, that is, the HDMI interface, receives the first data signal, the video data of the three pairs of data lines is recovered with reference to the clock line, and the video data is re-serialized and encoded into four pairs of high-speed data differential signals, which are transmitted to the next level LED control device 10 through the cascading interface 500. After the second interface 400, that is, the RJ45 interface, receives the second data signal, the four pairs of high-speed data differential signals are transmitted to the next level LED control device 10 through the cascading interface 500. The switching control circuit 210 includes a first resistor R1, a second resistor R2, a third resistor R3, and a switch tube Q1. The switch tube is usually a MOS tube or a triode, R1 is a pull-up resistor, one end of which is connected with a VCC power supply in the device, and the other end of which is connected with a control end of the high-speed switching component 220. R2 and R3 are voltage dividing and configuration resistors. One end of R2 is connected with +5V of the HDMI interface, and the other end is connected with a control end of the switch tube Q1. One end of R3 is connected with GND, and the other end is connected with the control end of the switch tube Q1, which provides a default switching state for the switch tube. By changing the access level of the control end of the switch tube Q1 through the access state of the HDMI interface, the control end of the high-speed switching component 220 is controlled, and the selection control of the control component 100 with the first interface 300 and the control component 100 with the second interface 400 is further realized. The HDMI interface can only be used as an input interface, and the RJ45 can be used as an input interface or an output interface. When the control component 100 detects that one of the RJ45 is an input interface, the other RJ45 is an output interface.

[0047] As shown in Figure 5 the control method of the LED control device 10 specifically comprises: initializing the switching control circuit 210 to output a high level, and the second interface 400 in the high-speed switching assembly 220 is enabled with the control assembly 100. The access state of the first interface 300 is detected in real time. When the 5V voltage is detected, the switch tube Q1 is turned on, the switching control circuit 210 outputs a low level, and the first interface 300 in the high-speed switching assembly 220 is enabled with the control assembly 100. More specifically, when the HDMI interface is not inserted with a cable, the +5V terminal is suspended, the control end of the switch tube Q1 is at a low level, the switch tube Q1 is not turned on, the first end of the switch tube Q1 is at a high level, and the second interface 400 in the high-speed switching assembly 220 is enabled with the control assembly 100. When the HDMI interface is inserted with a cable, the control end of the switch tube Q1 is at a high level, the switch tube Q1 is turned on, the first end of the switch tube Q1 is at a low level, and the first interface 300 in the high-speed switching assembly 220 is enabled with the control assembly 100.

[0048] In the embodiment, the LED control device comprises a control assembly 100, a switching control circuit 210, a high-speed switching assembly 220, a first interface 300, a second interface 400, and a cascaded interface 500. The first interface 300 is an HDMI interface, and the second interface 400 and the cascaded interface 500 are RJ45 interfaces. The LED control device 10 can adaptively select the HDMI interface or the RJ45 interface as a signal input interface. The control assembly 100 decodes the accessed signal and re-encodes it into four pairs of high-speed differential signals, which are output from the cascaded interface 500 to the next LED control device 10. While realizing high-bandwidth transmission of the link, the RJ45 is used as the cascaded transmission interface. The RJ45 has a buckle and can be made by field crimping, thereby solving the problem that the HDMI interface transmission cable is not unified and has no fixed buckle and is prone to loosening. The switching control circuit 210 can automatically identify the access state of the HDMI interface, and automatically switch the HDMI interface and the RJ45 interface. Therefore, the LED control device 10 can be used at any connection position in the cascade, avoiding the need to set multiple control cards for the LED display screen, unifying the material specifications, and further making the installation of the LED display screen more convenient.

[0049] In one of the embodiments, as shown in Figure 6 an LED control system is provided, which comprises a signal source 30 and a plurality of LED control devices 10 according to any one of the above embodiments; the plurality of LED control devices 10 are cascaded in sequence; the signal source 30 is connected with the first interface 300 of the first LED control device 10 in the sequence; in every two LED control devices 10 in the sequence, the cascaded interface 500 of the former LED control device 10 is connected with the second interface 400 of the latter LED control device 10. Each LED control device 10 is connected with a display device 20.Figure 6 The LED control system in the embodiment only takes two LED control devices 10 as an example, and in actual use, 10, 20 or even more LED control devices 10 can be set. The LED control system in the embodiment is similar to the implementation scheme of the LED control device in the above embodiment, and therefore the specific definition of the LED control system provided in the embodiment can refer to the definition of the LED control device in the above embodiment, which will not be described here.

[0050] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered as the scope of the description.

[0051] The above embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the protection scope of the application should be subject to the appended claims.

Claims

1. An LED control device, characterized in that, include: Control components, switching components, first interface, second interface, and cascading interface; The first interface is connected to a first data signal or the second interface is connected to a second data signal; The switching component is connected to the first interface, the second interface and the control component respectively, and is used to transmit the first data signal or the second data signal to the control component; The control component is connected to the cascade interface and the display device respectively, and is used to control the display device to display according to the first data signal or the second data signal; and to convert the first data signal into the second data signal and transmit it to the outside through the cascade interface.

2. The LED control device according to claim 1, characterized in that, The first data signal received by the first interface includes an HDMI data signal; The second data signal accessed by the second interface includes a high-speed digital signal.

3. The LED control device according to claim 2, characterized in that, The switching component includes a switching control circuit and a high-speed switching component; The input terminal of the switching control circuit is connected to the first interface, and the output terminal of the switching control circuit is connected to the control terminal of the high-speed switching component. Used to generate a control signal based on the access status of the first interface, and transmit the control signal to the high-speed switching component; The first input terminal of the high-speed switching component is connected to the first interface, and the second input terminal of the high-speed switching component is connected to the second interface; the output terminal of the high-speed switching component is connected to the control component. The control component is configured to select the first input terminal of the high-speed switching component to the output terminal of the high-speed switching component according to the control signal, and transmit the first data signal to the control component; or to select the second input terminal of the high-speed switching component to the output terminal of the high-speed switching component according to the control signal, and transmit the second data signal to the control component.

4. The LED control device according to claim 3, characterized in that, The switching control circuit includes: a switching transistor and a first resistor; The control terminal of the switching transistor is connected to the power contact of the first interface, the first terminal of the switching transistor is connected to the power supply through the first resistor, and the second terminal of the switching transistor is grounded. The control terminal of the high-speed switching component is connected to the connection point between the first terminal of the switching transistor and the first resistor.

5. The LED control device according to claim 4, characterized in that, The switching control circuit also includes a second resistor and a third resistor; One end of the second resistor is connected to the power contact of the first interface, and the other end of the second resistor is grounded through the third resistor; The control terminal of the switching transistor is connected to the connection point of the second resistor and the third resistor.

6. The LED control device according to claim 4, characterized in that, The switching transistor includes a MOSFET or a bipolar transistor.

7. The LED control device according to claim 1, characterized in that, The control component and the switching component are connected via a high-speed serial digital video transmission channel; The control component and the cascade interface are connected via a high-speed serial digital video transmission channel.

8. The LED control device according to claim 1, characterized in that, The first interface is an HDMI interface; The second interface is an RJ45 interface; The cascading interface is an RJ45 interface.

9. An LED control system, characterized in that, include: The signal source and a plurality of LED control devices as described in any one of claims 1 to 8; Multiple LED control devices are cascaded in sequence; The signal source is connected to the first interface of the first LED control device that is cascaded in sequence; In the cascaded LED control devices, the cascade interface of the preceding LED control device is connected to the second interface of the following LED control device.

10. The LED control system according to claim 9, characterized in that, Each of the LED control devices is connected to a corresponding display device.

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