LED display screen

Abstract

The embodiment of the invention discloses an LED display screen which comprises a control box and a display module. The control box comprises a switching power supply, a control module and a fusion module, the switching power supply and the control module are respectively connected with the fusion module, and the fusion module is used for performing fusion processing on a voltage signal output by the switching power supply and a data signal output by the control module so as to obtain a control signal; the display module comprises a decomposition module and a display unit, and the decomposition module is connected with the fusion module and the display unit and used for decomposing the control signal into a voltage signal and a data signal and transmitting the voltage signal and the data signal obtained through decomposition to the display unit. The layout is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of LED display, and in particular to an LED display screen. Background Art

[0002] With the continuous development of science and technology, LED display screens have become an indispensable part of today's society. They have the advantages of high brightness, clear and bright images, long-distance visibility, safety and energy saving. They are widely used in advertising display, stadiums, traffic signs, stage backgrounds, industrial control and other fields.

[0003] LED display screens are usually composed of multiple display units, each of which is controlled by a control box, which includes a switching power supply and a control card. The switching power supply is responsible for power supply, and the control card is responsible for controlling data signals. Figure 1 As shown, the control methods of existing LED display screens are mostly to transmit power and signals separately. The switching power supply directly outputs voltage to the display unit, and the control card outputs data signals to the display unit through an N-core signal cable, thereby jointly controlling the normal display of the display unit. However, in this method, more wires are consumed between the control box and the display unit, the cost is high, and the layout is cumbersome. Summary of the invention

[0004] The embodiment of the present invention provides an LED display screen, which can reduce the use of wires, lower costs, and facilitate layout.

[0005] In order to achieve the above object, an embodiment of the present invention provides an LED display screen, including a control box and a display module;

[0006] The control box includes a switching power supply, a control module and a fusion module. The switching power supply and the control module are respectively connected to the fusion module. The fusion module is used to fuse the voltage signal output by the switching power supply and the data signal output by the control module to obtain a control signal.

[0007] The display module includes a decomposition module and a display unit. The decomposition module is connected to the fusion module and the display unit, and is used to decompose the control signal into a voltage signal and a data signal, and transmit the decomposed voltage signal and data signal to the display unit respectively.

[0008] Wherein, the fusion module includes an integrated HUB board.

[0009] Wherein, the integrated HUB board includes a differential signal driving circuit, a signal fusion circuit, a connector circuit, a voltage conversion circuit and an output interface circuit;

[0010] The connector circuit is connected to the control module and is used to receive the data signal from the control module. The differential signal driving circuit is connected to the connector circuit and is used to convert the data signal of the control module into a differential signal. The signal fusion circuit is connected to the differential signal driving circuit and the switching power supply and is used to fuse the differential signal and the voltage signal to obtain a control signal. The output interface circuit is connected to the signal fusion circuit. The voltage conversion circuit is connected to the switching power supply and is used to convert the voltage signal of the switching power supply into an operating voltage and provide the operating voltage to the differential signal driving circuit, the signal fusion circuit and the connector circuit.

[0011] Wherein, the decomposition module includes a decomposition HUB board.

[0012] The display module further includes a decoding unit, which is connected between the decomposition module and the display unit and is used to convert the data signal decomposed by the decomposition module into an RGB signal and an image display control signal.

[0013] An embodiment of the present invention further provides an LED display screen, comprising the control device described above.

[0014] Beneficial effects: The control device of the LED display screen of the present invention comprises a control box and a display module; the control box comprises a switching power supply, a control module and a fusion module, the switching power supply and the control module are respectively connected to the fusion module, the fusion module is used to fuse the voltage signal output by the switching power supply and the data signal output by the control module, so as to obtain a control signal; the display module comprises a decomposition module and a display unit, the decomposition module is connected to the fusion module and the display unit, and is used to decompose the control signal into a voltage signal and a data signal, and transmit the decomposed voltage signal and data signal to the display unit respectively, thereby, by first fusing the voltage signal and the data signal together and then transmitting them to the display module for signal decomposition, only one set of transmission lines needs to be set between the control box and the display module, which can greatly reduce the number of wires, reduce costs, and make the layout more convenient and reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solutions and beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0016] Figure 1 It is a schematic diagram of the structure of the control device of the present invention;

[0017] Figure 2 is a circuit diagram of a connector circuit of the present invention;

[0018] Figure 3-a is a circuit diagram of a differential signal generating unit 1 of the present invention;

[0019] Figure 3-b is a circuit diagram of a differential signal generating unit 2 of the present invention;

[0020] Figure 3-c is a circuit diagram of a differential signal generating unit 3 of the present invention;

[0021] Figure 3-d is a circuit diagram of a differential signal generating unit 4 of the present invention;

[0022] Figure 4 is a circuit diagram of a fusion unit of the present invention;

[0023] Figure 5 is a circuit diagram of an interface unit of the present invention;

[0024] Figure 6 is a circuit diagram of a voltage conversion circuit of the present invention;

[0025] Figure 7 1 is a circuit diagram of a switching power supply of the present invention. DETAILED DESCRIPTION

[0026] Please refer to the drawings, in which the same component symbols represent the same components, and the principle of the present invention is illustrated by implementing it in an appropriate computing environment. The following description is based on the illustrated specific embodiment of the present invention, which should not be considered as limiting other specific embodiments of the present invention that are not described in detail herein.

[0027] See also Figure 1 The control device of the LED display screen according to the embodiment of the present invention includes a control box 1 and a display module 2.

[0028] The control box 1 includes a switching power supply 11, a control module 12 and a fusion module 13. The switching power supply 11 and the control module 12 are respectively connected to the fusion module 13. The fusion module 13 is used to fuse the voltage signal output by the switching power supply 11 and the data signal output by the control module 12 to obtain a control signal.

[0029] The display module 2 includes a decomposition module 21 and a display unit 22. The decomposition module 21 is connected to the fusion module 13 and the display unit 22, and is used to decompose the control signal into a voltage signal and a data signal, and transmit the decomposed voltage signal and data signal to the display unit 22 respectively.

[0030] Therefore, the LED display screen of the present invention combines the voltage signal and the data signal together first and then transmits them to the display module 2 for signal decomposition. Therefore, only one set of transmission lines needs to be set between the control box 1 and the display module 2, which can greatly reduce the number of wires, reduce costs, and make the layout more convenient and reasonable.

[0031] Furthermore, the fusion module 13 includes an integrated HUB board, wherein the integrated HUB board includes a differential signal driving circuit, a signal fusion circuit, a connector circuit, a voltage conversion circuit and an output interface circuit.

[0032] The connector circuit is connected to the control module 12 and is used to receive data signals from the control module 12. Figure 2 As shown, the connector circuit includes two connectors JH1 and JH2 and four capacitors C1 to C4. The two ends of capacitor C1 are connected to pins 2 and 4 of connector JH1 respectively, pin 4 of connector JH1 is grounded, and pins 2 and 1 are connected to the working voltage 4.7V. Pin 50 of connector JH1 is grounded through capacitor C3, and pins 49 and 50 are connected to the working voltage 4.7V. The two ends of capacitor C2 are connected to pins 2 and 4 of connector JH2 respectively, pin 4 of connector JH1 is grounded, and pins 2 and 1 are connected to the working voltage 4.7V. Pin 50 of connector JH2 is grounded through capacitor C4, and pins 49 and 50 are connected to the working voltage 4.7V.

[0033] There are 16 data signals output by the control module 12, namely data signal DRV_A to data signal DRV_P; pins 3, 5, 7, 9, 11, 13, 15, and 14 of connector JH1 output data signal DRV_A to data signal DRV~H respectively; pins 3, 5, 7, 9, 11, 13, 15, and 14 of connector JH2 output data signal DRV_I to data signal DRV~P respectively.

[0034] The differential signal driving circuit is connected to the connector circuit and is used to convert the data signal of the control module 12 into a differential signal. Figure 3-a to Figure 3-d As shown, the differential signal driving circuit includes four differential signal generating units, namely differential signal generating unit 1 31, differential signal generating unit 2 32, differential signal generating unit 3 33, and differential signal generating unit 4 34. The differential signal generating unit 1 31 includes a chip UD1 and its peripheral circuits, the differential signal generating unit 2 32 includes a chip UD2 and its peripheral circuits, the differential signal generating unit 3 33 includes a chip UD3 and its peripheral circuits, and the differential signal generating unit 4 34 includes a chip UD4 and its peripheral circuits. For specific circuit connection relationships, please refer to Figure 3-a to Figure 3-d. The 16 data signals are converted into 16 pairs of differential signals through four differential signal generating units. For example, the data signals DRV_A to DRV_D are input into the differential signal generating unit 31, and correspondingly generate the differential signal pairs LDV_A_P and LDV_A_N, the differential signal pairs LDV_B_P and LDV_B_N, the differential signal pairs LDV_C_P and LDV_C_N, the differential signal pairs LDV_D_P and LDV_D_N, and so on.

[0035] The signal fusion circuit is connected to the differential signal driving circuit and the switching power supply, and is used to fuse the differential signal and the voltage signal to obtain the control signal. Figure 4 As shown, the signal fusion circuit includes 16 fusion units 40, each fusion unit 40 has two signal input terminals for inputting differential signals LDV_i_P and LDV_i_N respectively, two signal output terminals i_IO_P and i_IO_N respectively, a feedback input terminal for inputting feedback signal FB_VREF and a feedback output terminal for outputting feedback signal FB_i, wherein the above i=A, B, C, ..., P, that is, 16 pairs of differential signals are respectively input into 16 fusion units 40, each fusion unit 40 is also connected to the positive voltage signal +24V and the negative voltage signal 24V_GD of the switching power supply 11, and each fusion unit 40 outputs a control signal according to the input differential signal, feedback signal and voltage signal, that is, a pair of differential signals i_IO_P and i_IO_N. Therefore, 16 control signals can be obtained through 16 fusion units 40, and each control signal carries a voltage signal and a differential signal as a data signal.

[0036] The output interface circuit is connected to the signal fusion circuit. Figure 5 As shown, the output interface circuit includes 16 interface units 50, each interface unit 50 includes a connector JPi, connector JPi has 1 pin and 2 pins, pin 1 and pin 2 are respectively used to input a pair of differential signals i_IO_P and i_IO_N, wherein the above i=A, B, C, ..., P.

[0037] The voltage conversion circuit is connected to the switching power supply, and is used to convert the voltage signal of the switching power supply into an operating voltage, and provide the operating voltage for the differential signal driving circuit, the signal fusion circuit, and the connector circuit. Figure 6 As shown, the voltage conversion circuit includes a voltage conversion chip U1 and its peripheral circuits. For specific circuit structures, please refer to Figure 6 Pin 3 of the voltage conversion chip U1 is used to input the positive voltage signal +24V of the switching power supply 11, and pin 2 of the voltage conversion chip U1 outputs the working voltage 4.7V through the inductor LL1 and the inductor L1, and outputs the feedback signal FB_VREF.

[0038] like Figure 7 As shown, the switching power supply 11 includes at least one DC power supply, Figure 7 Three DC power supplies are shown, namely, power supply Power-A, power supply Power-B, and power supply Power-C. The positive electrode of each DC power supply outputs +24V, and the negative electrode is grounded through the inductor L2 and the resistor RA1. Among them, the fusion unit 40 can be connected to the positive electrode of any DC power supply, and the voltage conversion circuit can also be connected to the positive electrode of any DC power supply.

[0039] Furthermore, the decomposition module 21 includes a decomposition HUB board. The decomposition module 21 is connected to the 16 connectors JPi via a transmission line to obtain a control signal, and decomposes the control signal to obtain a voltage signal and a data signal.

[0040] Furthermore, the display module 2 also includes a decoding unit 23, which is connected between the decomposition module 21 and the display unit 22 and is used to convert the data signal decomposed by the decomposition module 21 into an RGB signal and an image display control signal.

[0041] Therefore, by first merging the voltage signal and the data signal together and then transmitting them to the display module 2 for signal decomposition, only one set of transmission lines needs to be set between the control box 1 and the display module 2, which can greatly reduce the number of wires, reduce costs, and make the layout more convenient and reasonable. In addition, by synchronously transmitting the voltage signal and the data signal, the wires of the data signal are greatly reduced, avoiding the loss, distortion and interference problems during the signal transmission process, and at the same time significantly optimizing the EMI phenomenon of the product.

[0042] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An LED display screen, characterized in that: Including control box and display module; The control box includes a switching power supply, a control module and a fusion module. The switching power supply and the control module are respectively connected to the fusion module. The fusion module is used to fuse the voltage signal output by the switching power supply and the data signal output by the control module to obtain a control signal. The display module includes a decomposition module and a display unit. The decomposition module is connected to the fusion module and the display unit, and is used to decompose the control signal into a voltage signal and a data signal, and transmit the decomposed voltage signal and data signal to the display unit respectively.

2. The LED display screen according to claim 1, characterized in that: The fusion module includes an integrated HUB board.

3. The LED display screen according to claim 2, characterized in that: The integrated HUB board includes a differential signal driving circuit, a signal fusion circuit, a connector circuit, a voltage conversion circuit and an output interface circuit; The connector circuit is connected to the control module and is used to receive the data signal from the control module. The differential signal driving circuit is connected to the connector circuit and is used to convert the data signal of the control module into a differential signal. The signal fusion circuit is connected to the differential signal driving circuit and the switching power supply and is used to fuse the differential signal and the voltage signal to obtain a control signal. The output interface circuit is connected to the signal fusion circuit. The voltage conversion circuit is connected to the switching power supply and is used to convert the voltage signal of the switching power supply into an operating voltage and provide the operating voltage to the differential signal driving circuit, the signal fusion circuit and the connector circuit.

4. The LED display screen according to claim 1, characterized in that: The decomposition module includes a decomposition HUB board.

5. The LED display screen according to claim 1, characterized in that: The display module also includes a decoding unit, which is connected between the decomposition module and the display unit and is used to convert the data signal decomposed by the decomposition module into an RGB signal and an image display control signal.

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