Single-link LVDS (Low Voltage Differential Signaling) interface long-distance multi-screen control circuit

Abstract

A single-link LVDS (Low Voltage Differential Signaling) interface remote multi-screen control circuit is provided with an LVDS source end, a video input end group of the LVDS source end is connected with a video signal source, a control signal input end group of the LVDS source end is connected with a controller, an output end group of the LVDS source end is connected with an input end group of an LVDS terminal, and the output end group of the LVDS terminal is connected with at least two relay modules in parallel; each relay module is provided with a relay LVDS (Low Voltage Differential Signaling) source end and a relay LVDS terminal, an input end group of the relay LVDS source end is connected with an output end group of the LVDS terminal, an output end group of the relay LVDS source end is connected with an input end group of the relay LVDS terminal, and an output end group of the relay LVDS terminal is connected with an input end group of a lower-level relay module or a display. The beneficial effects are that the system is long in transmission distance, is low in cost, is easy to expand, and is high in anti-interference capability.

Description

Technical Field

[0001] This utility model relates to the field of multi-screen synchronous display and control technology, and in particular to a long-distance multi-screen control circuit with a single-link LVDS interface. Background Technology

[0002] With the increasing demand for multi-screen synchronous display in scenarios such as multimedia advertising screens and information display screens, traditional video signal transmission and control methods have gradually exposed the following problems:

[0003] Limited transmission distance: Traditional LVDS or HDMI video signals are susceptible to signal attenuation and interference after the transmission distance exceeds a certain length, resulting in image distortion or unstable transmission.

[0004] Complex and costly systems: Existing multi-screen display control systems often require independent wiring for each display terminal, increasing deployment costs and system complexity.

[0005] Lack of flexible scalability: Most systems do not support single-link control of multiple screens, have weak scalability, and are difficult to meet the needs of large-scale display applications.

[0006] Poor anti-interference capability of control signals: In complex electromagnetic environments, control signals are easily interfered with, leading to instability in functions such as touch control and remote control. Utility Model Content

[0007] This utility model provides a single-link LVDS interface long-distance multi-screen control circuit, which features long transmission distance, low cost, easy expansion and strong anti-interference ability.

[0008] To achieve the above objectives, this utility model provides a single-link LVDS interface long-distance multi-screen control circuit, the key of which is: an LVDS source end is provided, the video input terminal group of the LVDS source end is connected to a video signal source, the control signal input terminal group of the LVDS source end is connected to a controller, the output terminal group of the LVDS source end is connected to the input terminal group of the LVDS terminal, and at least two relay modules are connected in parallel to the output terminal group of the LVDS terminal;

[0009] Each of the relay modules is provided with a relay LVDS source end and a relay LVDS terminal. The input terminal group of the relay LVDS source end is connected to the output terminal group of the LVDS terminal, the output terminal group of the relay LVDS source end is connected to the input terminal group of the relay LVDS terminal, and the output terminal group of the relay LVDS terminal is connected to the input terminal group of the next-level relay module or the display.

[0010] The signal source is used to output data stream signals.

[0011] The LVDS source is used to receive the data stream signal and perform serial processing on the data stream signal to obtain serial data; the LVDS terminal is used to receive the serial data and process the serial data to restore the original data stream signal.

[0012] The relay LVDS source is used to serialize the data stream signal from the LVDS terminal again to obtain serial data; the relay LVDS terminal is used to process the serial data from the relay LVDS source to restore the original data stream signal and transmit it to the display.

[0013] The display is used to receive video stream information from the relay LVDS terminal and display the received content on the screen terminal.

[0014] Through the above design, firstly, the data stream signal and control signal are transmitted separately, and anti-interference design is implemented through independent lines and circuit modules, which effectively improves the anti-interference capability of the control signal and enhances system stability. Secondly, by setting multiple relay modules in parallel on the output circuit of the LVDS terminal, a single video link can simultaneously connect to and control multiple displays. At the same time, each relay node has synchronization identification and delay compensation functions, ensuring display consistency. The centralized main control + distributed display structure supports multiple terminals to synchronously receive the same LVDS signal stream and respond to control commands, realizing unified control and remote operation, effectively reducing the cost of multi-screen display control.

[0015] Preferably, the circuit structure of the LVDS source terminal is the same as that of the relay LVDS source terminal, and the circuit structure of the LVDS terminal is the same as that of the relay LVDS terminal; the connection circuit of the LVDS source terminal and the LVDS terminal is the same as that of the connection circuit of the relay LVDS source terminal and the relay LVDS terminal.

[0016] The above design ensures the consistency of transmitted signals during long-distance transmission, thus guaranteeing signal transmission quality.

[0017] As a preferred option, N levels of repeater modules are set up according to the signal transmission distance, where N≥1, and the N levels of repeater modules are distributed in a tree-like structure.

[0018] The N-level repeater modules are arranged in a tree-like structure, which not only extends the signal transmission distance but also enables synchronous control of more displays.

[0019] Preferably, the signal source is a cockpit domain controller, which is used to output data stream signals.

[0020] Preferably, the data stream signal includes, but is not limited to, video signals, audio signals, control signals, and data signals.

[0021] Preferably, the LVDS source and relay LVDS source use the DS90UB947 chip, and the LVDS terminal and relay LVDS terminal use the DS90UB948 chip.

[0022] Preferably, a power supply circuit is also provided, which includes a main power supply circuit and a secondary power supply circuit.

[0023] The main power supply circuit is equipped with a common-mode choke L1. The positive input terminal of the common-mode choke L1 is connected to the cathode of a Zener diode D7. The anode of the Zener diode D7 is connected to the power supply. A transient voltage suppressor diode (TVS1) is connected in series with the anode of the Zener diode D7 and then grounded. A resistor R200 is also connected in series with the anode of the Zener diode D7 and then grounded. Capacitors C272 and C274 are connected in series with the anode of the Zener diode D7 and then grounded. The negative input terminal of the common-mode choke L1 is grounded. The positive output terminal of the common-mode choke L1 is connected to the power supply. The input terminal Vin of the manager is connected to the common mode choke L1. The positive output terminal of the common mode choke L1 is connected to ground via resistors R201 and R206 in series. The common terminal of resistors R201 and R206 is connected to the power monitoring terminal of the controller via resistor R203 in series. The positive output terminal of the common mode choke L1 is also connected to ground via capacitor C268 in series, capacitor C269 in series, capacitor C270 in series, capacitor C271 in series, and the negative output terminal of the common mode choke L1 is grounded.

[0024] The output terminal SW of the power manager is connected to the front end of inductor L2, and the rear end of inductor L2 outputs 5V power. Capacitors C280, C281, C282, and C278 are connected in series with the rear end of inductor L2 and then grounded. The rear end of inductor L2 is also connected to the cathode of Zener diode D8, and the anode of Zener diode D8 is grounded. The rear end of inductor L2 is also connected in series with resistor R205 and then to the anode of light-emitting diode LED1, and the cathode of light-emitting diode LED1 is grounded.

[0025] The power supply circuit is used to supply power to the other modules.

[0026] Preferably, the auxiliary power supply circuit includes a 3.3V power supply circuit, a 1.8V power supply circuit, a 1.2V power supply circuit, and a 1.1V power supply circuit.

[0027] The 3.3V power supply circuit includes a first step-down transformer U8. The input terminal of the first step-down transformer U8 is connected to a 5V power supply. Capacitors C283, C284, and C285 are connected in series with the input terminal of the first step-down transformer U8 before grounding. The output terminal of the first step-down transformer U8 is connected to the front end of resistor R210, and the rear end of resistor R210 outputs a 3.3V power supply. Capacitors C287, C288, and C289 are also connected in series with the output terminal of the first step-down transformer U8 before grounding. Resistor R211 is connected in series with the rear end of resistor R210 before connecting to the anode of LED2, and the cathode of LED2 is grounded.

[0028] The 1.8V power supply circuit is equipped with a second step-down transformer U11. The input terminal of the second step-down transformer U11 is connected to a 5V power supply. The input terminal of the second step-down transformer U11 is also connected in series with a capacitor C293 and then grounded. The output terminal of the second step-down transformer U11 is connected in series with a resistor R213 and then outputs a 1.8V power supply. The output terminal of the second step-down transformer U11 is also connected in series with a capacitor C292 and then grounded.

[0029] The 1.2V power supply circuit is equipped with a third step-down transformer U9. The input terminal of the third step-down transformer U9 is connected to a 5V power supply. The input terminal of the third step-down transformer U9 is also connected in series with a capacitor C290 and then grounded. The output terminal of the third step-down transformer U9 is connected in series with a resistor R209 and then outputs a 1.2V power supply. The output terminal of the third step-down transformer U9 is also connected in series with a capacitor C286 and then grounded.

[0030] The 1.1V power supply circuit includes a fourth step-down transformer U10. The input of the fourth step-down transformer U10 is connected to a 5V power supply. A capacitor C291 is connected in series with the input of the fourth step-down transformer U10 before grounding. Resistors R214 and R216 are also connected in series with the input of the fourth step-down transformer U10 before grounding. The common terminal of resistors R214 and R216 is connected to the enable terminal EN of the fourth step-down transformer U10. The output of the fourth step-down transformer U10 is connected to the front end of inductor L3. A resistor R212 is connected in series with the rear end of inductor L3 to output a 1.1V power supply. Resistors R215 and R217 are also connected in series with the rear end of inductor L3 before grounding. The common terminal of resistors R215 and R217 is connected to the feedback terminal FB of the fourth step-down transformer U10. Capacitors C294 and C295 are also connected in series with the rear end of inductor L3 before grounding.

[0031] The beneficial effects of this utility model are:

[0032] Supports ultra-long-distance transmission: Through relay and filtering technology, LVDS signals can be stably transmitted to tens of meters or even further, meeting the needs of large-scale advertising or display scenarios;

[0033] Single-link control of multiple screens: significantly reduces cabling complexity and hardware costs, and improves system scalability and deployment efficiency;

[0034] Low cost and high reliability: Compared with traditional multi-screen systems, it has a lower overall cost and higher stability. Attached Figure Description

[0035] Figure 1 This is a circuit structure block diagram of the present invention;

[0036] Figure 2 This is a circuit diagram of the signal source in the embodiment;

[0037] Figure 3 This is a circuit diagram of the LVDS source terminal in the embodiment;

[0038] Figure 4 This is a circuit diagram of the LVDS terminal in the embodiment;

[0039] Figure 5 This is a diagram of the relay LVDS source end in the embodiment;

[0040] Figure 6 This is a diagram of a relay LVDS terminal in the embodiment;

[0041] Figure 7 This is a circuit diagram of the display in the embodiment;

[0042] Figure 8 This is the main power supply circuit diagram in the embodiment;

[0043] Figure 9 This is a circuit diagram of the auxiliary power supply in the embodiment. Detailed Implementation

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and specific examples. The following embodiments or drawings are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0045] like Figure 1-7 As shown: A single-link LVDS interface long-distance multi-screen control circuit is provided, which is equipped with an LVDS source end. The video input terminal group of the LVDS source end is connected to a video signal source, the control signal input terminal group of the LVDS source end is connected to a controller, the output terminal group of the LVDS source end is connected to the input terminal group of the LVDS terminal, and at least two relay modules are connected in parallel to the output terminal group of the LVDS terminal.

[0046] Each of the relay modules is provided with a relay LVDS source end and a relay LVDS terminal. The input terminal group of the relay LVDS source end is connected to the output terminal group of the LVDS terminal, the output terminal group of the relay LVDS source end is connected to the input terminal group of the relay LVDS terminal, and the output terminal group of the relay LVDS terminal is connected to the input terminal group of the next-level relay module or the display.

[0047] The circuit structure of the LVDS source terminal is the same as that of the relay LVDS source terminal, and the circuit structure of the LVDS terminal is the same as that of the relay LVDS terminal; the connection circuit of the LVDS source terminal and the LVDS terminal is the same as that of the connection circuit of the relay LVDS source terminal and the relay LVDS terminal.

[0048] Based on the signal transmission distance, N levels of repeater modules can be set up accordingly, where N≥1, and the N levels of repeater modules are distributed in a tree-like structure.

[0049] In this embodiment, the signal source is a cockpit domain controller; the LVDS source end and the relay LVDS source end use the DS90UB947 chip, and the LVDS terminal and the relay LVDS terminal use the DS90UB948 chip.

[0050] The signal source is used to output data stream signals, which include video signals, audio signals, control signals, and data signals.

[0051] It is also equipped with a power supply circuit, which includes a main power supply circuit and a secondary power supply circuit.

[0052] like Figure 8 As shown: The main power supply circuit is equipped with a common-mode choke L1. The positive input terminal of the common-mode choke L1 is connected to the cathode of a Zener diode D7. The anode of the Zener diode D7 is connected to the power supply. A transient voltage suppressor diode TVS1 is connected in series with the anode of the Zener diode D7 and then grounded. A resistor R200 is also connected in series with the anode of the Zener diode D7 and then grounded. Capacitors C272 and C274 are connected in series with the anode of the Zener diode D7 and then grounded. The negative input terminal of the common-mode choke L1 is grounded. The positive output terminal of the common-mode choke L1 is connected to the power supply. The input terminal Vin of the source manager, the positive output terminal of the common mode choke L1 is connected to ground via resistors R201 and R206 in series, the common terminal of resistors R201 and R206 is connected to the power monitoring terminal of the controller via resistor R203 in series; the positive output terminal of the common mode choke L1 is also connected to ground via capacitor C268 in series, capacitor C269 in series, capacitor C270 in series, capacitor C271 in series, and the negative output terminal of the common mode choke L1 is grounded;

[0053] The output terminal SW of the power manager is connected to the front end of inductor L2, and the rear end of inductor L2 outputs 5V power. Capacitors C280, C281, C282, and C278 are connected in series with the rear end of inductor L2 and then grounded. The rear end of inductor L2 is also connected to the cathode of Zener diode D8, and the anode of Zener diode D8 is grounded. The rear end of inductor L2 is also connected in series with resistor R205 and then to the anode of light-emitting diode LED1, and the cathode of light-emitting diode LED1 is grounded.

[0054] like Figure 9 As shown: The auxiliary power supply circuit includes a 3.3V power supply circuit, a 1.8V power supply circuit, a 1.2V power supply circuit, and a 1.1V power supply circuit;

[0055] The 3.3V power supply circuit includes a first step-down transformer U8. The input terminal of the first step-down transformer U8 is connected to a 5V power supply. Capacitors C283, C284, and C285 are connected in series with the input terminal of the first step-down transformer U8 before grounding. The output terminal of the first step-down transformer U8 is connected to the front end of resistor R210, and the rear end of resistor R210 outputs a 3.3V power supply. Capacitors C287, C288, and C289 are also connected in series with the output terminal of the first step-down transformer U8 before grounding. Resistor R211 is connected in series with the rear end of resistor R210 before connecting to the anode of LED2, and the cathode of LED2 is grounded.

[0056] The 1.8V power supply circuit is equipped with a second step-down transformer U11. The input terminal of the second step-down transformer U11 is connected to a 5V power supply. The input terminal of the second step-down transformer U11 is also connected in series with a capacitor C293 and then grounded. The output terminal of the second step-down transformer U11 is connected in series with a resistor R213 and then outputs a 1.8V power supply. The output terminal of the second step-down transformer U11 is also connected in series with a capacitor C292 and then grounded.

[0057] The 1.2V power supply circuit is equipped with a third step-down transformer U9. The input terminal of the third step-down transformer U9 is connected to a 5V power supply. The input terminal of the third step-down transformer U9 is also connected in series with a capacitor C290 and then grounded. The output terminal of the third step-down transformer U9 is connected in series with a resistor R209 and then outputs a 1.2V power supply. The output terminal of the third step-down transformer U9 is also connected in series with a capacitor C286 and then grounded.

[0058] The 1.1V power supply circuit includes a fourth step-down transformer U10. The input of the fourth step-down transformer U10 is connected to a 5V power supply. A capacitor C291 is connected in series with the input of the fourth step-down transformer U10 before grounding. Resistors R214 and R216 are also connected in series with the input of the fourth step-down transformer U10 before grounding. The common terminal of resistors R214 and R216 is connected to the enable terminal EN of the fourth step-down transformer U10. The output of the fourth step-down transformer U10 is connected to the front end of inductor L3. A resistor R212 is connected in series with the rear end of inductor L3 to output a 1.1V power supply. Resistors R215 and R217 are also connected in series with the rear end of inductor L3 before grounding. The common terminal of resistors R215 and R217 is connected to the feedback terminal FB of the fourth step-down transformer U10. Capacitors C294 and C295 are also connected in series with the rear end of inductor L3 before grounding.

[0059] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A single-link LVDS interface long-distance multi-screen control circuit, characterized in that: An LVDS source is provided, wherein the video input terminal group of the LVDS source is connected to a video signal source, the control signal input terminal group of the LVDS source is connected to a controller, the output terminal group of the LVDS source is connected to the input terminal group of the LVDS terminal, and at least two repeater modules with identical structures are connected in parallel to the output terminal group of the LVDS terminal. Each of the relay modules is provided with a relay LVDS source end and a relay LVDS terminal. The input terminal group of the relay LVDS source end is connected to the output terminal group of the LVDS terminal, the output terminal group of the relay LVDS source end is connected to the input terminal group of the relay LVDS terminal, and the output terminal group of the relay LVDS terminal is connected to the input terminal group of the next-level relay module or the display.

2. The single-link LVDS interface long-distance multi-screen control circuit according to claim 1, characterized in that: The circuit structure of the LVDS source terminal is the same as that of the relay LVDS source terminal, and the circuit structure of the LVDS terminal is the same as that of the relay LVDS terminal; the connection circuit of the LVDS source terminal and the LVDS terminal is the same as that of the connection circuit of the relay LVDS source terminal and the relay LVDS terminal.

3. The single-link LVDS interface long-distance multi-screen control circuit according to claim 1, characterized in that: Based on the signal transmission distance, N levels of relay modules are set up, and the N levels of relay modules are distributed in a tree-like manner.

4. The single-link LVDS interface long-distance multi-screen control circuit according to claim 1, characterized in that: The signal source is the cockpit domain controller, which is used to output data stream signals.

5. The single-link LVDS interface long-distance multi-screen control circuit according to claim 4, characterized in that: The data stream signals include, but are not limited to, video signals, audio signals, control signals, and data signals.

6. The single-link LVDS interface long-distance multi-screen control circuit according to claim 2, characterized in that: The LVDS source and relay LVDS source use the DS90UB947 chip, and the LVDS terminal and relay LVDS terminal use the DS90UB948 chip.

7. The single-link LVDS interface long-distance multi-screen control circuit according to claim 1, characterized in that: It is also equipped with a power supply circuit, which includes a main power supply circuit and an auxiliary power supply circuit; The main power supply circuit is equipped with a common-mode choke L1. The positive input terminal of the common-mode choke L1 is connected to the cathode of a Zener diode D7. The anode of the Zener diode D7 is connected to the power supply. A transient voltage suppressor diode (TVS1) is connected in series with the anode of the Zener diode D7 and then grounded. A resistor R200 is also connected in series with the anode of the Zener diode D7 and then grounded. Capacitors C272 and C274 are connected in series with the anode of the Zener diode D7 and then grounded. The negative input terminal of the common-mode choke L1 is grounded. The positive output terminal of the common-mode choke L1 is connected to the power supply. The input terminal Vin of the manager is connected to the common mode choke L1. The positive output terminal of the common mode choke L1 is connected to ground via resistors R201 and R206 in series. The common terminal of resistors R201 and R206 is connected to the power monitoring terminal of the controller via resistor R203 in series. The positive output terminal of the common mode choke L1 is also connected to ground via capacitor C268 in series, capacitor C269 in series, capacitor C270 in series, capacitor C271 in series, and the negative output terminal of the common mode choke L1 is grounded. The output terminal SW of the power manager is connected to the front end of inductor L2, and the rear end of inductor L2 outputs 5V power. Capacitors C280, C281, C282, and C278 are connected in series with the rear end of inductor L2 and then grounded. The rear end of inductor L2 is also connected to the cathode of Zener diode D8, and the anode of Zener diode D8 is grounded. The rear end of inductor L2 is also connected in series with resistor R205 and then to the anode of light-emitting diode LED1, and the cathode of light-emitting diode LED1 is grounded.

8. A single-link LVDS interface long-distance multi-screen control circuit according to claim 7, characterized in that: The auxiliary power supply circuit includes a 3.3V power supply circuit, a 1.8V power supply circuit, a 1.2V power supply circuit, and a 1.1V power supply circuit. The 3.3V power supply circuit includes a first step-down transformer U8. The input terminal of the first step-down transformer U8 is connected to a 5V power supply. Capacitors C283, C284, and C285 are connected in series with the input terminal of the first step-down transformer U8 before grounding. The output terminal of the first step-down transformer U8 is connected to the front end of resistor R210, and the rear end of resistor R210 outputs a 3.3V power supply. Capacitors C287, C288, and C289 are also connected in series with the output terminal of the first step-down transformer U8 before grounding. Resistor R211 is connected in series with the rear end of resistor R210 before connecting to the anode of LED2, and the cathode of LED2 is grounded. The 1.8V power supply circuit is equipped with a second step-down transformer U11. The input terminal of the second step-down transformer U11 is connected to a 5V power supply. The input terminal of the second step-down transformer U11 is also connected in series with a capacitor C293 and then grounded. The output terminal of the second step-down transformer U11 is connected in series with a resistor R213 and then outputs a 1.8V power supply. The output terminal of the second step-down transformer U11 is also connected in series with a capacitor C292 and then grounded. The 1.2V power supply circuit is equipped with a third step-down transformer U9. The input terminal of the third step-down transformer U9 is connected to a 5V power supply. The input terminal of the third step-down transformer U9 is also connected in series with a capacitor C290 and then grounded. The output terminal of the third step-down transformer U9 is connected in series with a resistor R209 and then outputs a 1.2V power supply. The output terminal of the third step-down transformer U9 is also connected in series with a capacitor C286 and then grounded. The 1.1V power supply circuit is equipped with a fourth step-down transformer U10. The input terminal of the fourth step-down transformer U10 is connected to a 5V power supply. The input terminal of the fourth step-down transformer U10 is also connected in series with a capacitor C291 and then grounded. The input terminal of the fourth step-down transformer U10 is also connected in series with a resistor R214 and a resistor R216 and then grounded. The common terminal of the resistor R214 and the resistor R216 is connected to the enable terminal EN of the fourth step-down transformer U10. The output terminal of the fourth step-down transformer U10 is connected to the front end of the inductor L3. The rear end of the inductor L3 is connected in series with resistor R212 to output a 1.1V power supply. The rear end of the inductor L3 is also connected in series with resistors R215 and R217 to ground. The common terminal of resistors R215 and R217 is connected to the feedback terminal FB of the fourth step-down transformer U10. The rear end of the inductor L3 is also connected in series with capacitors C294 and C295 to ground.

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