A screen wake-up circuit based on LVDS line
By setting up a total filter circuit on the LVDS line, the wake-up signal and video signal are transmitted by the DC signal and the AC signal respectively, which solves the problem that the traditional display screen needs to be equipped with two wire harnesses, achieving a lower cost and more flexible system design.
Patent Information
- Application Number
- CN202421627328.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-07-10
AI Technical Summary
Traditional displays require two wiring harnesses to be set up when wake up, limiting the flexibility of system design and increasing costs.
By setting the total filtering circuit on the LVDS line, the wake-up signal and the video signal are transmitted by the DC signal and the AC signal respectively, so that it can be transmitted on the same LVDS line without the need to set the wake-up harness separately.
Reduces the number of wire harnesses used in the entire vehicle, reduces costs, and simplifies the design and maintenance process.
Smart Images
Figure CN222713429U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of application circuits, and in particular relates to a screen wake-up circuit based on an LVDS line. Background Art
[0002] With the development of automobile technology, screens are increasingly used in automobiles due to their display function advantages.
[0003] When waking up a display screen in sleep mode, a traditional display screen needs to set up an EN wake-up harness in addition to the LVDS communication harness to separately transmit the video signal and the wake-up signal, which limits the flexibility of system design and increases costs. Summary of the invention
[0004] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a screen wake-up circuit based on LVDS line, which solves the problem that a display screen in a dormant state needs to be set with two wire harnesses to realize wake-up and display.
[0005] The technical solution of the utility model: a screen wake-up circuit based on LVDS line, comprising a host, a display screen and an LVDS line for electrically connecting the host and the display screen, the host comprising an enable signal output circuit for outputting a wake-up signal and a first coupling circuit for transmitting a video signal, the display screen comprising an enable signal detection circuit for collecting the wake-up signal and a second coupling circuit for transmitting a video signal, the input end and the output end of the LVDS line are both provided with a total filter circuit, each of the total filter circuits comprises a low-pass filter circuit and an AC capacitor;
[0006] The first coupling circuit and the second coupling circuit are respectively connected in series with one of the AC capacitors and then connected to the LVDS line. The enable signal output circuit and the enable signal detection circuit are respectively connected in series with one of the low-pass filter circuits and then connected to the LVDS line.
[0007] By adopting the above technical solution, the wake-up signal and the video signal are transmitted by the DC signal and the AC signal respectively by setting the total filter circuit, so that they can be transmitted on the same LVDS line, and there is no need to set up a separate wake-up harness to wake up the screen, thereby reducing the number of harnesses used in the whole vehicle and lowering the cost. After transmission through the LVDS line, the transmitted signal is filtered again by another total filter circuit, so that the AC signal passes into the second coupling circuit and the DC signal passes into the enable signal detection circuit, thereby realizing the transmission of the wake-up signal and the video signal.
[0008] The utility model is further configured as follows: each of the low-pass filter circuits includes a capacitor group consisting of two parallel capacitors, a first inductor and a second inductor connected in series, the enable signal output circuit and the enable signal detection circuit are respectively connected in series with the first inductor correspondingly connected to the low-pass filter circuit, and a capacitor group is connected in parallel between them, the input and output ends of the LVDS line are respectively connected in series with the first inductor correspondingly connected to the low-pass filter circuit, and the second inductor is connected in series between each of the first inductors and the LVDS line, and a shielding resistor is connected in parallel with the first inductor.
[0009] With the above further configuration, the capacitor group and two inductors are used to filter and shield the AC signal, and the parallel resistor consumes the induced current to shield the interference to the DC output signal, ensuring that the AC signal is filtered out within a certain frequency range.
[0010] The utility model is further configured as follows: the first inductance in each of the low-pass filter circuits is 10 μH, the second inductance is 2.2 μH, and the resistance of the shielding resistor is 1.2 kΩ.
[0011] By adopting the above-mentioned further setting, through the adjustment and setting of the inductance value, the AC signal in the frequency range of 5MHz-4.2GHz in the wake-up signal is filtered out, so as to avoid generating a large gain for the AC signal transmitting video information through the AC capacitor, so as to ensure that after passing through the same LVDS line, the wake-up signal and the video signal can still be identified separately after being filtered and collected.
[0012] The utility model is further configured as follows: the host also includes a controller, the controller is electrically connected to the first coupling circuit through a serial port, the controller is connected to the enable signal output circuit through a coding line, the display screen also includes a screen, a deserializer chip for decoding transmission, and a processor, the deserializer chip is electrically connected to the second coupling circuit and the screen respectively, and the processor is connected to the output end of the enable signal detection circuit through a coding line.
[0013] With the above further configuration, the host can send a wake-up signal and a video signal respectively. After filtering, the processor receives and processes the transmitted DC wake-up signal to wake up the screen. At the same time, the deserializer chip can decode and process the AC video signal within a certain frequency range and display it on the screen. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 A schematic diagram of a wiring harness required for waking up a screen in the prior art;
[0015] Figure 2 It is a schematic diagram of the overall structure in a specific embodiment of the utility model;
[0016] Figure 3 This is a schematic diagram of the connection structure of the total filter circuit in a specific embodiment of the utility model;
[0017] Figure 4 This is a simulation result diagram of the total filter circuit in a specific embodiment of the utility model.
[0018] In the figure: 1. host; 2. LVDS line; 3. display screen; 4. enable signal output circuit; 5. first coupling circuit; 6. enable signal detection circuit; 7. second coupling circuit; 8. total filter circuit; 9. low-pass filter circuit; 10. AC capacitor; 11. capacitor group; 12. first inductor; 13. second inductor; 14. shielding resistor; 15. screen; 16. deserializer chip; 17. processor; 18. controller; 19. serial port. DETAILED DESCRIPTION
[0019] The technical scheme in this embodiment will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] It should be noted that in the description of the present invention, all directional indications (such as up, down, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0021] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. In the description of the present invention, the meaning of "several" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited.
[0022] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that technical personnel in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0023] In the embodiment of the utility model, Figure 1-3 As shown, a screen wake-up circuit based on an LVDS line includes a host 1, a display screen 3, and an LVDS line 2 for electrically connecting the host 1 and the display screen 3.
[0024] The host 1 includes a controller 18, the controller 18 can be connected to a first coupling circuit 5 through a serial port 19 and other LVDS lines for transmitting video signals, and the controller 18 can be connected to an enable signal output circuit 4 through a coding line for outputting a DC enable voltage to transmit a wake-up signal;
[0025] The display screen 3 includes a screen 15, a deserializer chip 16 for decoding and transmission, and a processor 17. The deserializer chip 16 uses a Deser chip and can be connected to the screen 15 and the second coupling circuit 7 through two LVDS lines, and is used to decode the video signal collected by the second coupling circuit 7 and transmit it to the screen 15 for display. The processor 17 is connected to the enable signal detection circuit 6 through the encoding line for receiving the wake-up signal.
[0026] In this embodiment, the host 1 and the display screen 3 transmit the video signal and the wake-up signal by only setting one LVDS line 2, so that the input and output ends of the LVDS line 2 are both connected with a total filter circuit 8, and the two total filter circuits 8 are symmetrical. The two total filter circuits 8 can be built-in on the host 1 and the display screen 3 respectively, or can be placed outside the host 1 and the display screen 3. It is only necessary to realize that the two total filter circuits 8 are connected to the host 1 and the display screen 3 respectively;
[0027] The total filtering circuit 8 connected to the host 1 is used to filter the wake-up signal to remove the AC signal of the corresponding transmission frequency, filter the video signal to remove the DC signal, and then transmit the filtered wake-up signal and video signal to the LVDS line 2;
[0028] The total filter circuit 8 connected to the display screen 3 is used to filter the signal transmitted from the LVDS line 2, transmit the wake-up signal with the corresponding frequency filtered out to the enable signal detection circuit 6, and transmit the AC video signal with the DC signal removed to the deserializer chip 16 for decoding.
[0029] Each total filtering circuit 8 includes a low-pass filtering circuit 9 and an AC capacitor 10. The first coupling circuit 5 and the second coupling circuit 7 are respectively connected in series with an AC capacitor 10 for filtering DC signals and transmitting AC video signals. The enable signal output circuit 4 and the enable signal detection circuit 6 are respectively connected in series with a low-pass filtering circuit 9 for filtering AC signals of corresponding transmission frequencies and transmitting wake-up signals.
[0030] Each low-pass filter circuit 9 includes a capacitor group 11 consisting of two parallel capacitors, a first inductor 12 and a second inductor 13 connected in series, and a shielding resistor 14 connected in parallel with the first inductor 12;
[0031] The first inductors 12 in the low-pass filter circuit 9 connected to the enable signal output circuit 4 and the enable signal detection circuit 6 are connected in series, and a capacitor group 11 is connected in parallel between them. The first inductors 12 in the low-pass filter circuit 9 connected to the input and output ends of the LVDS line 2 are connected in series, and a second inductor 13 is connected in series between each first inductor 12 and the LVDS line 2. By adjusting the first inductor 12 to 10μH and the second inductor 13 to 2.2μH, the AC signal in the frequency range of 5MHz-4.2GHz in the filtered transmission wake-up signal can be controlled. Figure 4 As shown, the dB loss of the gain of the output AC signal is small before 5MHz, and the impact on the AC signal transmitting video information passing through the AC capacitor 10 is small, so as to ensure that after passing through the same LVDS line 2, the wake-up signal and the video signal can still be identified and collected after being screened by the total filter circuit 8, so as to realize the simultaneous transmission of the wake-up signal and the video signal using one LVDS line 2.
[0032] The shielding resistor 14 is further configured to have a higher impedance, which is set to 1.2 kΩ, so as to consume the inductive current and avoid interference with the DC wake-up signal.
[0033] Specifically, by setting up a total filter circuit 8, the wake-up signal and the video signal are transmitted by a DC signal and an AC signal respectively, and the AC signal in the corresponding frequency range in the wake-up signal is filtered out to avoid causing greater interference to the AC video signal. After being transmitted through the LVDS line 2, the transmitted signal is filtered again by another total filter circuit 8, so that the AC video signal passes through the second coupling circuit 7, and the DC wake-up signal passes through the enable signal detection circuit 6, thereby realizing the transmission of the wake-up signal and the video signal on the same LVDS line 2, and there is no need to set up a separate wake-up harness to wake up the screen 15, thereby reducing the number of harnesses used in the whole vehicle, lowering the cost, and simplifying the design and maintenance process, bringing more possibilities for product development and application.
Claims
1. A screen wake-up circuit based on an LVDS line, comprising a host (1), a display screen (3), and an LVDS line (2) for electrically connecting the host (1) and the display screen (3), wherein the host (1) comprises an enable signal output circuit (4) for outputting a wake-up signal and a first coupling circuit (5) for transmitting a video signal, and the display screen (3) comprises an enable signal detection circuit (6) for collecting the wake-up signal and a second coupling circuit (7) for transmitting a video signal, characterized in that: The input end and the output end of the LVDS line (2) are both provided with a total filter circuit (8), and each of the total filter circuits (8) includes a low-pass filter circuit (9) and an AC capacitor (10); The first coupling circuit (5) and the second coupling circuit (7) are each connected in series with one of the AC capacitors (10) and then connected to the LVDS line (2); the enable signal output circuit (4) and the enable signal detection circuit (6) are each connected in series with one of the low-pass filter circuits (9) and then connected to the LVDS line (2).
2. The screen wake-up circuit based on LVDS line according to claim 1, characterized in that: Each of the low-pass filter circuits (9) comprises a capacitor group (11) consisting of two parallel capacitors, a first inductor (12) and a second inductor (13) connected in series; the enable signal output circuit (4) and the enable signal detection circuit (6) are respectively connected in series with the first inductor (12) in the low-pass filter circuit (9) correspondingly connected thereto, and a capacitor group (11) is connected in parallel therebetween; the input and output ends of the LVDS line (2) are respectively connected in series with the first inductor (12) in the low-pass filter circuit (9) correspondingly connected thereto, and the second inductor (13) is connected in series between each of the first inductors (12) and the LVDS line (2); and a shielding resistor (14) is connected in parallel to the first inductor (12).
3. The screen wake-up circuit based on LVDS line according to claim 2, characterized in that: The first inductance (12) in each low-pass filter circuit (9) is 10 μH, the second inductance (13) is 2.2 μH, and the resistance of the shielding resistor (14) is 1.2 kΩ.
4. The screen wake-up circuit based on LVDS line according to claim 1, characterized in that: The display screen (3) further comprises a screen (15), a deserializer chip (16) for decoding transmission, and a processor (17); the deserializer chip (16) is electrically connected to the second coupling circuit (7) and the screen (15), respectively; and the processor (17) is connected to an output end of the enable signal detection circuit (6) via a coding line.
5. The screen wake-up circuit based on LVDS line according to claim 1, characterized in that: The host (1) further comprises a controller (18), wherein the controller (18) is electrically connected to the first coupling circuit (5) via a serial port (19), and the controller (18) is connected to the enable signal output circuit (4) via a coding line.