Display unit of LED spliced screen

Abstract

The utility model relates to the technical field of LED display screens, and discloses a display unit of an LED splicing screen, which comprises a power supply module, an HDMI (High Definition Multimedia Interface) module, a video decoding module and an LED display driving module which are electrically connected in sequence, the HDMI module comprises an HDMI interface circuit, and the HDMI interface circuit comprises at least one high-definition wire holder J1, an electrostatic suppression chip U11 and an electrostatic suppression chip U22. According to the utility model, the HDMI interface circuit and other aspects are improved, and the two HDMI direct connection ports are arranged, so that an HDMI signal source can be directly connected with one HDMI direct connection port through a single HDMI line to serve as signal input; the other HDMI direct connection port is connected with display units of other expanded LED splicing screens to serve as signal output, and transfer equipment is not needed; and a plurality of HDMI interfaces are arranged, so that modular expansion is facilitated, and the stability of the equipment is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of LED display screens, in particular to the field of HDMI transmission of LED displays, and specifically to a display unit of an LED splicing screen. Background Art

[0002] An LED display is a display method that controls semiconductor light-emitting diodes and consists of tens to hundreds of thousands of evenly arranged semiconductor light-emitting diode pixels. In LED displays, the HDMI interface is one of the most important signal input interfaces. Through the HDMI interface, the LED display can receive high-definition video and audio signals from sources such as computers, Blu-ray players, and game consoles, and achieve high-quality display. Traditional LED cabinet display modules are mostly connected via network cables. When the HDMI signal source wants to transmit the signal to the LED screen, it requires the help of an LED processor to act as an intermediary, first processing the HDMI signal before transmitting it to the LED cabinet display module via the network cable. This signal transmission process requires a transfer device (LED processor), which may lead to signal delay and distortion, increase equipment cost, and reduce equipment stability.

[0003] In the prior art, Chinese utility model patent 201621212803.4 discloses an HDMI transmission system, which includes an HDMI input unit, a signal transmitting unit, a signal receiving unit, an HDMI output unit, and a signal control unit. Although this patented technology uses active optical cables (AOCs) for signal transmission, eliminating the limitations of long-distance HDMI signal transmission in the prior art and improving signal transmission quality and bandwidth, it still suffers from the problem of relying on costly AOC equipment. The overall structure is highly complex due to the optical-to-electrical conversion, and maintenance and replacement are more complicated than traditional HDMI cables.

[0004] In summary, existing AOC transmission equipment suffers from high costs, a complex overall structure due to optoelectronic conversion, and is more complex to repair and replace than traditional HDMI cables. Existing network cable-based transmission equipment suffers from signal delays and distortion, and is unstable. Furthermore, existing transmission equipment lacks an information output interface, making it incapable of addressing the expansion of multiple LED display devices. Therefore, the development of a new display unit for LED splicing screens is urgently needed. Utility Model Content

[0005] The purpose of this utility model is to provide a display unit for an LED splicing screen. Through various structural improvements, the overall circuit and interface design of the display unit are simplified, intermediate transfer equipment is saved, modular expansion is facilitated, and the stability of the equipment is enhanced to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A display unit of an LED splicing screen comprises a power module, an HDMI module, a video decoding module, and an LED display driver module which are electrically connected in sequence;

[0008] The power module is electrically connected to an external power source;

[0009] The HDMI module is connected to an external HDMI signal source;

[0010] The HDMI module includes an HDMI interface circuit, which includes at least one high-definition wiring socket J1, an electrostatic suppression chip U11, and an electrostatic suppression chip U22. The electrostatic suppression chip U11 and the electrostatic suppression chip U22 are both connected to the TMDS pins of each high-definition wiring socket J1.

[0011] A voltage-stabilizing diode D3 and a voltage-stabilizing diode D4 are connected between pins 14 and 19 of the HD wiring socket J1, a switching diode D2 is connected to pin 15 of the HD wiring socket J1, a switching diode D1 is connected to pin 16 of the HD wiring socket J1, and pin 1 of the switching diode D1 and pin 1 of the switching diode D2 are both connected to pin 18 of the HD wiring socket J1.

[0012] There are two high-definition wiring sockets J1; one of the high-definition wiring sockets J1 is electrically connected to the signal source HDMI cable, and the other high-definition wiring socket J1 is electrically connected to the HDMI cable for signal output.

[0013] The LED display driver module includes a main control circuit, an LED dot matrix circuit, a row drive circuit, and a column drive circuit. The row drive circuit and the column drive circuit are electrically connected to the main control circuit and the LED dot matrix circuit; the main control circuit includes a chip U1, and a switch K1 and a capacitor C19 arranged in parallel are connected to pin 9 of the chip U1. The switch K1 is connected to pin 1 of the chip U1. A crystal oscillator X1 is connected between pins 19 and 20 of the chip U1. Capacitors C29 and C39 are connected in series at both ends of the crystal oscillator X1. A resistor R29 is connected between the connection terminals of the switch K1 and capacitor C19 and the connection terminals of capacitors C29 and C39.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The display unit of the LED splicing screen provided by this utility model simplifies the overall circuit and interface design of the unit through various structural improvements. Through the design of the HDMI interface circuit, two HDMI direct-connect ports are provided. The HDMI signal source can be directly connected to one HDMI direct-connect port via a single HDMI cable as signal input; the other HDMI direct-connect port is connected to the display unit of other expanded LED splicing screens as signal output. No transfer equipment is required, which facilitates modular expansion and enhances the stability of the device.

[0016] 2. The display unit of the LED splicing screen provided by the present invention shortens the connection of HDMI devices, can transmit high-definition monitoring images more quickly and stably, and reduce the delay and distortion caused by signal transfer.

[0017] 3. The display unit of the LED splicing screen provided by the present invention does not require complicated switching equipment or signal conversion. It can ensure clear and smooth images by directly connecting through an HDMI cable, thereby improving the user experience.

[0018] 4. The display unit of the LED splicing screen provided by the present invention only needs to be connected to the power supply and HDMI signal, and the connection is simple; during maintenance, the fault is easy to locate according to the abnormal display status, and the hot-swappable function can be performed, making the maintenance operation more convenient and efficient, without the need for frequent power on and off, saving time and energy.

[0019] 5. The display unit of the LED splicing screen provided by the present invention solves the problem of HDMI signal connection when the display units of multiple LED splicing screens are expanded by setting two HDMI interfaces, one for output and one for input, which greatly reduces the wiring and reduces the difficulty of expanding HDMI devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall module structure of an embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the circuit principle of the power supply circuit of an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the circuit principle of the HDMI interface circuit of an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of the circuit principle of the main control circuit of an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the circuit principle of the LED dot matrix circuit of an embodiment of the present utility model;

[0025] Figure 6Schematic diagram of the circuit principle of the row driving circuit of an embodiment of the present utility model;

[0026] Figure 7 Schematic diagram of the circuit principle of the column driving circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example 1

[0029] See also Figures 1 to 7 The display unit of the LED splicing screen provided in this embodiment includes a power module, an HDMI module, a video decoding module, and an LED display driver module electrically connected in sequence:

[0030] The power module is electrically connected to the external power supply and provides stable voltage and current for the HDMI transmission device;

[0031] The HDMI module connects to an external HDMI signal source and transmits the received high-definition video and audio signals from the signal source to the LED display. The HDMI module includes an HDMI interface circuit, which includes at least one high-definition wiring socket J1, an electrostatic suppression chip U11, and an electrostatic suppression chip U22. The electrostatic suppression chip U11 and the electrostatic suppression chip U22 are both connected to the TMDS pins of each high-definition wiring socket J1.

[0032] The video decoding module is used to decode the digital signal received by the HDMI module and convert it into a signal format that can be recognized by the LED display;

[0033] The LED display driver module is used to convert the signal processed by the video decoding module into a visual image;

[0034] A voltage-stabilizing diode D3 and a voltage-stabilizing diode D4 are connected between pins 14 and 19 of the HD wiring socket J1, a switching diode D2 is connected to pin 15 of the HD wiring socket J1, a switching diode D1 is connected to pin 16 of the HD wiring socket J1, and pin 1 of the switching diode D1 and pin 1 of the switching diode D2 are both connected to pin 18 of the HD wiring socket J1.

[0035] There are two high-definition wiring sockets J1; one of the high-definition wiring sockets J1 is electrically connected to the signal source HDMI cable, and the other high-definition wiring socket J1 is electrically connected to the HDMI cable for signal output.

[0036] The display unit of the LED splicing screen provided by this utility model has a simplified design through various structural improvements. Through the design of the HDMI interface circuit, two HDMI direct-connect ports are provided. An HDMI signal source can be directly connected to one HDMI direct-connect port via a single HDMI cable for signal input; the other HDMI direct-connect port is connected to the display unit of another expanded LED splicing screen for signal output. This eliminates the need for intermediate devices, facilitates modular expansion, and enhances device stability. These various structural improvements shorten the connection length of HDMI devices, enabling faster and more stable transmission of high-definition surveillance images, reducing delays and distortion caused by signal relays.

[0037] Example 2

[0038] See also Figures 1 to 7 The display unit of the LED splicing screen provided in this embodiment is an improvement based on the first embodiment. The LED display driver module includes a main control circuit, an LED dot matrix circuit, a row driver circuit, and a column driver circuit. The row driver circuit and the column driver circuit are electrically connected to the main control circuit and the LED dot matrix circuit.

[0039] The main control circuit includes a chip U1, and a switch K1 and a capacitor C19 arranged in parallel are connected to pin 9 of the chip U1. The switch K1 is connected to pin 1 of the chip U1. A crystal oscillator X1 is connected between pins 19 and 20 of the chip U1. Capacitors C29 and C39 are connected in series at both ends of the crystal oscillator X1. A resistor R29 is connected between the connection terminals of the switch K1 and capacitor C19 and the connection terminals of capacitors C29 and C39.

[0040] Optionally, the LED dot matrix circuit includes a first dot matrix LED and a second dot matrix LED, the first dot matrix LED includes LED lamp LD1, LED lamp LD2, LED lamp LD3, and LED lamp LD4, and the second dot matrix LED includes LED lamp LD5, LED lamp LD6, LED lamp LD7, and LED lamp LD8.

[0041] Optionally, the row driving circuit also includes chip U2 and chip U3, pin 14 of the chip U2 is connected to pin 9 of the chip U3, the chip U2 is connected to the second dot matrix LED, and the chip U3 is connected to the first dot matrix LED; and pin 12 of the chip U2 and pin 12 of the chip U3 are both connected to pin 15 of the chip U1, and pin 11 of the chip U2 and pin 11 of the chip U3 are both connected to pin 16 of the chip U1; pin 14 of the chip U3 is connected to pin 14 of the chip U1.

[0042] Optionally, the column driving circuit also includes a chip U4 and a chip U5, and the chip U4 and the chip U5 are both connected to the first dot matrix LED and the second dot matrix LED, and the 20th pin of the chip U4 and the 20th pin of the chip U5 are both connected to the 37th pin of the chip U1, and the 21st pin of the chip U4 and the 21st pin of the chip U5 are both connected to the 38th pin of the chip U1, and the 22nd pin of the chip U4 and the 22nd pin of the chip U5 are both connected to the 39th pin of the chip U1, and the 23rd pin of the chip U4 and the 23rd pin of the chip U5 are both connected to the 40th pin of the chip U1, and the 18th pin of the chip U4 is connected to the 36th pin of the chip U1, and the 18th pin of the chip U5 is connected to the 35th pin of the chip U1.

[0043] Optionally, the power supply module includes a power supply circuit, which includes an overvoltage protection branch, a rectifier filter branch, a clamping absorption branch, a transformer T1, a rectifier output branch, and a constant current branch. The overvoltage protection branch, the rectifier filter branch, the clamping absorption branch, the transformer T1, and the rectifier output branch are connected in sequence, and the clamping absorption branch, the transformer T1, and the rectifier output branch are all electrically connected to the constant current branch.

[0044] Optional, see Figure 2 As shown, the overvoltage protection branch includes a resistor R1 and an adjustable resistor RV; the rectifier and filter branch includes a rectifier bridge BD, a capacitor C1, an inductor L1, and a capacitor C2; the clamping absorption branch includes a resistor R2 and a capacitor C3 in parallel; the transformer T1 adopts a flyback working mode; the rectifier output branch includes a diode D4, an inductor L2, a capacitor C8, a capacitor C9, and three light-emitting diodes; the constant current branch includes a chip U10, a resistor R6, a resistor R7, two optocouplers, a capacitor C6, a capacitor C4, a resistor R3, a diode D3, a resistor R4, a resistor R5, and a capacitor C5.

[0045] The display unit of the LED splicing screen provided in this embodiment was trial-produced under confidentiality and applied to an outdoor LED screen in a certain city park. This outdoor LED screen uses multiple LED splicing screen display units. Adjacent LED splicing screen display units are connected via short HDMI cables, enabling rapid splicing of multiple LED splicing screen display units. Compared to traditional installation methods, this reduces the complexity of the work and significantly saves HDMI cables. The stability of the device is also greatly improved.

[0046] The basic workflow of the HDMI module in this embodiment mainly covers steps such as data transmission, signal detection, and device connection. HDMI uses TMDS (Transition Minimized Differential Signaling) technology to achieve high-speed data transmission, and can directly connect to the LED cabinet module to drive the screen to display a complete segmented computer image or monitoring image. The display units of the LED splicing screen provided in this embodiment all adopt the international standard HDMI1.3, which increases the transmission rate to 10.2Gbps and supports the transmission of 2.3 million pixels, while traditional networks can only achieve the transmission of 650,000 pixels, greatly reducing the configuration of the connection system. In addition, it also supports hot plugging, that is, the HDMI cable can be connected or disconnected when the device is not turned off.

[0047] In summary, the display unit of the LED splicing screen provided by the present invention, through various structural improvements, does not require complicated switching equipment, does not require signal conversion, and can ensure clear and smooth images by directly connecting through an HDMI cable, thereby improving the user experience. The display unit of the LED splicing screen provided by the present invention, through various structural improvements, has simple wiring, only requires power supply and HDMI signal, and can be hot-swapped according to abnormal display status during maintenance, making faults easy to locate, making maintenance operations more convenient and efficient, without the need for frequent power on and off, saving time and energy. The display unit of the LED splicing screen provided by the present invention, through various structural improvements, solves the problem of HDMI signal connection when the display units of multiple LED splicing screens are expanded by setting two HDMI interfaces, one in and one out, greatly reducing wiring and reducing the difficulty of expanding HDMI devices.

[0048] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A display unit of an LED splicing screen, characterized in that: It includes a power module, an HDMI module, a video decoding module, and an LED display driver module that are electrically connected in sequence; The power module is electrically connected to an external power source; The HDMI module is connected to an external HDMI signal source; The HDMI module includes an HDMI interface circuit, which includes at least one high-definition wiring socket J1, an electrostatic suppression chip U11, and an electrostatic suppression chip U22. The electrostatic suppression chip U11 and the electrostatic suppression chip U22 are both connected to the TMDS pin of the high-definition wiring socket J1.

2. The display unit of the LED splicing screen according to claim 1, characterized in that: A voltage-stabilizing diode D3 and a voltage-stabilizing diode D4 are connected between pins 14 and 19 of the HD wiring socket J1, a switching diode D2 is connected to pin 15 of the HD wiring socket J1, a switching diode D1 is connected to pin 16 of the HD wiring socket J1, and pin 1 of the switching diode D1 and pin 1 of the switching diode D2 are both connected to pin 18 of the HD wiring socket J1.

3. The display unit of the LED splicing screen according to claim 1, characterized in that: There are two high-definition wiring sockets J1; one of the high-definition wiring sockets J1 is electrically connected to the signal source HDMI cable, and the other high-definition wiring socket J1 is electrically connected to the HDMI cable for signal output.

4. The display unit of the LED splicing screen according to claim 1, characterized in that: The LED display driver module includes a main control circuit, an LED dot matrix circuit, a row drive circuit, and a column drive circuit, wherein the row drive circuit and the column drive circuit are both electrically connected to the main control circuit and the LED dot matrix circuit; The main control circuit includes a chip U1, and a switch K1 and a capacitor C19 arranged in parallel are connected to pin 9 of the chip U1. The switch K1 is connected to pin 1 of the chip U1. A crystal oscillator X1 is connected between pins 19 and 20 of the chip U1. Capacitors C29 and C39 are connected in series at both ends of the crystal oscillator X1. A resistor R29 is connected between the connection terminals of the switch K1 and capacitor C19 and the connection terminals of capacitors C29 and C39.

5. The display unit of the LED splicing screen according to claim 4, characterized in that: The LED dot matrix circuit includes a first dot matrix LED and a second dot matrix LED. The first dot matrix LED includes LED lamp LD1, LED lamp LD2, LED lamp LD3, and LED lamp LD4. The second dot matrix LED includes LED lamp LD5, LED lamp LD6, LED lamp LD7, and LED lamp LD8.

6. The display unit of the LED splicing screen according to claim 5, characterized in that: The row drive circuit includes chip U2 and chip U3, pin 14 of chip U2 is connected to pin 9 of chip U3, chip U2 is connected to the second dot matrix LED, and chip U3 is connected to the first dot matrix LED; and pin 12 of chip U2 and pin 12 of chip U3 are both connected to pin 15 of chip U1, pin 11 of chip U2 and pin 11 of chip U3 are both connected to pin 16 of chip U1; pin 14 of chip U3 is connected to pin 14 of chip U1.

7. The display unit of the LED splicing screen according to claim 6, characterized in that: The column driving circuit includes chip U4 and chip U5. Chip U4 and chip U5 are both connected to the first dot matrix LED and the second dot matrix LED. Pin 20 of chip U4 and pin 20 of chip U5 are both connected to pin 37 of chip U1. Pin 21 of chip U4 and pin 21 of chip U5 are both connected to pin 38 of chip U1. Pin 22 of chip U4 and pin 22 of chip U5 are both connected to pin 39 of chip U1. Pin 23 of chip U4 and pin 23 of chip U5 are both connected to pin 40 of chip U1. Pin 18 of chip U4 is connected to pin 36 of chip U1. Pin 18 of chip U5 is connected to pin 35 of chip U1.

8. The display unit of the LED splicing screen according to claim 1, characterized in that: The power supply module includes a power supply circuit, which includes an overvoltage protection branch, a rectifier and filter branch, a clamping absorption branch, a transformer T1, a rectifier output branch, and a constant current branch. The overvoltage protection branch, the rectifier and filter branch, the clamping absorption branch, the transformer T1, and the rectifier output branch are connected in sequence, and the clamping absorption branch, the transformer T1, and the rectifier output branch are all electrically connected to the constant current branch.

9. The display unit of the LED splicing screen according to claim 8, characterized in that: The overvoltage protection branch includes a resistor R1 and an adjustable resistor RV; the rectifier and filter branch includes a rectifier bridge BD, a capacitor C1, an inductor L1, and a capacitor C2; the clamping absorption branch includes a resistor R2 and a capacitor C3 in parallel; the transformer T1 adopts a flyback working mode; the rectifier output branch includes a diode D4, an inductor L2, a capacitor C8, a capacitor C9, and three light-emitting diodes; the constant current branch includes a chip U10, a resistor R6, a resistor R7, two optocouplers, a capacitor C6, a capacitor C4, a resistor R3, a diode D3, a resistor R4, a resistor R5, and a capacitor C5.

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