Vehicle-mounted display system and display method

Abstract

The invention provides a vehicle-mounted display system and a display method. The system comprises a cabin area controller and a display screen, the cabin area controller and the display screen are connected through a coaxial line. The cabin domain controller comprises an SOC chip, a first POC circuit and a boost circuit. The display screen comprises a single-chip microcomputer, a second POC circuit, a common mode inductor, at least one LED high-side linear driver, at least one LED light bar and a power supply. Each LED lamp strip comprises at least one LED lamp bead; the at least one LED high-side linear driver corresponds to the at least one LED light bar in a one-to-one mode. Therefore, the current is reduced through the booster circuit, so that the POC circuit and the coaxial line of the vehicle-mounted application can meet the requirement of a large-size vehicle-mounted display screen, the loss and heat emission of the coaxial line are reduced, the requirement on the inductance of the POC circuit is reduced, and the cost is reduced; the LED high-side linear driver is used, the cost is lower, input voltage fluctuation is not generated, interference of traditional backlight power supply conducted emission on POC link signals does not exist, and electromagnetic compatibility and anti-interference performance are improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to an in-vehicle display system and display method. Background Technology

[0002] Currently, vehicles are typically equipped with in-vehicle display systems, and domain controllers control the vehicle's display screens to achieve various human-machine interaction functions.

[0003] In a common solution for signal transmission and power supply to a display screen, the cockpit domain controller connects to the display screen via two separate connections: one for signal transmission and the other for power supply. However, this method is costly, requiring additional power supply wiring harnesses, increasing vehicle weight, and adding costs for wiring harnesses, connectors, interface protection circuits, and filtering circuits. Furthermore, it has poor electromagnetic interference resistance, is prone to failure, and can cause problems such as screen flickering, distorted display, and touch point glitches.

[0004] Currently, POC (Power over Coax) circuits are mainly used in automotive cameras, allowing for the connection of a single coaxial cable to both transmit power and signals. However, large-size automotive displays require higher power supply currents, which existing POC technology cannot meet. Furthermore, coaxial cables experience significant losses and heat generation when carrying high currents, making existing coaxial cables for signal transmission unsuitable for high-current POC power supply. Additionally, the backlight power supply circuits used in automotive displays generate considerable heat, and the screen's proximity to direct sunlight exacerbates this, leading to PCB overheating and potentially triggering high-temperature protection. The high power output and large input ripple of the backlight power supply circuit also make it susceptible to interference coupling to the signal coaxial cable, resulting in poor electromagnetic interference immunity.

[0005] In summary, the existing cockpit domain controller and display screen circuit connection has many problems and cannot meet the needs of actual production applications. Summary of the Invention

[0006] In view of this, the purpose of this application is to provide an in-vehicle display system and display method that uses only a single coaxial cable for power supply and signal transmission, thereby reducing screen costs, reducing heat generation, and optimizing electromagnetic compatibility.

[0007] This application provides an in-vehicle display system, including: a cockpit domain controller and a display screen; the cockpit domain controller and the display screen are connected via a coaxial cable; the cockpit domain controller includes a SOC chip, a first POC circuit, and a boost circuit; the display screen includes a microcontroller, a second POC circuit, a common-mode inductor, at least one LED high-side linear driver, at least one LED strip, and a power supply; each LED strip includes at least one LED bead; the at least one LED high-side linear driver and the at least one LED strip correspond one-to-one; The first terminal of the SOC chip is connected to the first terminal of the first POC circuit, the second terminal of the SOC chip is connected to the first terminal of the boost circuit, the second terminal of the boost circuit is connected to the second terminal of the first POC circuit, and the third terminal of the first POC circuit is connected to the display screen via a coaxial cable; the third terminal of the boost circuit is connected to an external power supply. A coaxial cable connected to the display screen is connected to the first terminal of the second POC circuit, and the outer shield of the coaxial cable is connected to the first terminal of the common-mode inductor. The second terminal of the second POC circuit is connected to the second terminal of the common-mode inductor, and the third terminal of the second POC circuit is connected to the first terminal of the microcontroller. The second terminal of the microcontroller is connected to the first terminal of each LED high-side linear driver, and the second terminal of each LED high-side linear driver is connected to the first terminal of the corresponding LED strip. The third terminal of the microcontroller is connected to the second terminal of each LED strip, and the third terminal of each LED strip is grounded. The third terminal of the common-mode inductor is grounded, and the fourth terminal of the common-mode inductor is connected to the power supply and the third terminal of each LED high-side linear driver.

[0008] Furthermore, the first POC circuit includes a second capacitor, a first inductor, and a second inductor; The second terminal of the first POC circuit is divided into two paths: one path is connected to the first inductor and the second inductor in sequence, and the other path is grounded through the second capacitor; the second inductor and the first terminal of the first POC circuit are connected to the third terminal of the first POC circuit.

[0009] Furthermore, the second POC circuit includes a third capacitor, a third inductor, and a fourth inductor; The first terminal of the second POC circuit is divided into two paths. One path is connected to the third terminal of the second POC circuit, and the other path is connected to the third inductor and the fourth inductor in sequence. The fourth inductor is connected to the third capacitor and grounded, and the fourth inductor is connected to the second terminal of the second POC circuit.

[0010] Furthermore, the in-vehicle display system also includes a first capacitor, a fourth capacitor, a serializer, and a deserializer; The first terminal of the SOC chip is connected to the first terminal of the first POC circuit via the serializer and the first capacitor; the third terminal of the second POC circuit is connected to the first terminal of the microcontroller via the fourth capacitor and the deserializer.

[0011] Furthermore, the in-vehicle display system also includes a first connector and a second connector; The third terminal of the first POC circuit is connected to the coaxial cable via the first connector; The coaxial cable connected to the display screen is connected to the first end of the second POC circuit via the second connector, and the outer shield of the coaxial cable is connected to the first end of the common mode inductor.

[0012] Furthermore, the vehicle display system also includes a high-side switch; the high-side switch is disposed between the second terminal of the boost circuit and the second terminal of the first POC circuit.

[0013] Furthermore, the boost circuit includes a boost / buck-boost circuit.

[0014] Furthermore, the in-vehicle display system also includes a fifth capacitor, a fifth inductor, and a sixth inductor; The fourth terminal of the common-mode inductor is connected to the first terminal of the fifth capacitor, the first terminal of the fifth inductor, and the first terminal of the sixth inductor, respectively; the second terminal of the fifth capacitor is grounded; and the second terminal of the fifth inductor is connected to the power supply.

[0015] This application also provides an in-vehicle display method, applied to any of the in-vehicle display systems described above; the method includes: The SOC chip generates a voltage control command based on the actual voltage value of each LED strip received and sends the voltage control command to the boost circuit to adjust the output voltage of the boost circuit; The SOC chip sends a brightness control command to the first POC circuit; The first POC circuit superimposes the power signal of the boost circuit and the brightness control command and transmits them to the second POC circuit via a coaxial cable; The second POC circuit decouples the power signal and the brightness control command, connects the power signal to the second terminal of the common mode inductor, and sends the brightness control command to the microcontroller. The microcontroller performs dimming control on the high-side linear driver of each LED according to the brightness control command to adjust the display brightness of each LED light strip; and detects the actual voltage value of each LED light strip and sends the actual voltage value of each LED light strip to the SOC chip.

[0016] Furthermore, the SOC chip generates a voltage control command based on the received actual voltage value of each LED strip, including: The SOC chip determines the target voltage value by summing the actual voltage value, the line loss voltage value, and the minimum voltage drop value of the LED high-side linear driver, and generates the voltage control command based on the target voltage value.

[0017] This application provides an in-vehicle display system and method that reduces current through a boost circuit, enabling the POC circuit and coaxial cable used in in-vehicle applications to meet the requirements of large-size in-vehicle displays. This reduces coaxial cable loss and heat generation, lowers the requirements for the inductance of the POC circuit, and reduces costs. The use of an LED high-side linear driver further reduces costs and eliminates input voltage fluctuations. It also eliminates interference from conducted emissions from traditional backlight power supplies on the POC link signal, improving electromagnetic compatibility and anti-interference capabilities. To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This illustration shows one of the structural schematic diagrams of an in-vehicle display system provided in an embodiment of this application; Figure 2 This is a second schematic diagram of the structure of an in-vehicle display system provided in an embodiment of this application; Figure 3 A flowchart of an in-vehicle display method provided in an embodiment of this application is shown; Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of this application is shown. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.

[0021] Research has found that vehicles are typically equipped with in-vehicle display systems, and domain controllers control the vehicle's display screens to achieve various human-machine interaction functions.

[0022] In a common solution for signal transmission and power supply to a display screen, the cockpit domain controller connects to the display screen via two separate connections: one for signal transmission and the other for power supply. However, this approach is costly, requiring additional power supply wiring harnesses, increasing vehicle weight, and adding costs for wiring harnesses, connectors, interface protection circuits, and filtering circuits. Furthermore, it suffers from inconsistent ground potentials between the shielding layer and the power connector, resulting in poor electromagnetic interference immunity and a tendency to fail in battery interference immunity (BCI) tests, leading to issues such as screen flickering, distorted touch input, and other problems.

[0023] Currently, POC (Power over Coax) circuits are mainly used in automotive cameras, allowing for connection of the camera using a single coaxial cable while simultaneously transmitting power and signals. However, for large-size automotive displays, the use of backlight switching power supply circuits requires higher current, and the application of POC technology still faces the following challenges: 1. Large screens cannot use POC power supply because the POC inductor cannot meet the current requirements: For example, a 15.6-inch screen requires a rated current of 2A. There is no corresponding high-current POC inductor. The POC link cannot meet the power supply current requirements. After the POC inductor increases the bias current, the inductance value drops sharply, causing the S-parameters of the signal link to fail to meet the chip requirements when it is powered on, resulting in impedance mismatch. There is no POC inductor on the market that can meet the corresponding current requirements.

[0024] 2. Coaxial cable has high DC loss and large voltage fluctuation when the power consumption of the display increases: When a large current passes through it, the voltage drop of the coaxial cable is large, which generates heat and power loss, increases the requirements for the cable harness, and the coaxial cable used for signal transmission cannot meet the power supply requirements of high current POC.

[0025] 3. Excessive screen heat generation: The backlight switching power supply circuit generates a lot of heat, increasing the overall screen temperature and causing it to become too hot to touch, resulting in discomfort. Furthermore, when the screen is exposed to direct sunlight, the combined heat from the PCB can easily trigger the high-temperature protection mechanism, forcing the brightness to be reduced. Additionally, using analog dimming at high brightness will further reduce efficiency and increase heat generation, while PWM dimming will produce flickering.

[0026] 4. Poor EMC (Electromagnetic Compatibility) performance: The backlight driver's switching power supply has high power and large input ripple, resulting in significant radiated emissions. Interference is easily coupled to the signal coaxial line, and the display screen typically lacks shielding measures, making it impossible to effectively shield the backlight switching power supply. It also has poor anti-interference capabilities, facing significant voltage fluctuations from the vehicle's BAT power supply, which are conducted to the coaxial line link, causing signal distortion, resulting in screen flickering and backlight issues.

[0027] In summary, the existing cockpit domain controller and display screen circuit connection has many problems and cannot meet the needs of actual production applications.

[0028] Based on this, this application provides an in-vehicle display system and display method that uses only a single coaxial cable for power supply and signal transmission, thereby reducing screen costs, reducing heat generation, and optimizing electromagnetic compatibility.

[0029] Please see Figure 1 , Figure 1 This is one of the structural schematic diagrams of an in-vehicle display system provided in an embodiment of this application. Figure 1 As shown in the illustration, the in-vehicle display system provided in this application embodiment includes: a cockpit domain controller 100 and a display screen 200; the cockpit domain controller 100 and the display screen 200 are connected via a coaxial cable; the cockpit domain controller 100 includes a SOC chip 101, a first POC circuit 102, and a boost circuit 103; the display screen 200 includes a microcontroller (MCU) 201, a second POC circuit 202, a common-mode inductor 203, at least one LED high-side linear driver, at least one LED light strip, and a power supply 204; each LED light strip includes at least one LED bead; the at least one LED high-side linear driver and the at least one LED light strip correspond one-to-one. For example, Figure 1 The diagram shows two LED high-side linear drivers A1 and A2, and two corresponding LED strips B1 and B2.

[0030] The first terminal of the SOC chip 101 is connected to the first terminal of the first POC circuit 102, the second terminal of the SOC chip 101 is connected to the first terminal of the boost circuit 103, the second terminal of the boost circuit 103 is connected to the second terminal of the first POC circuit 102, and the third terminal of the first POC circuit 102 is connected to the display screen 200 via a coaxial cable; the third terminal of the boost circuit 103 is used to connect to an external power supply. A coaxial cable connected to the display screen 200 is connected to the first terminal of the second POC circuit 202, and the outer shield of the coaxial cable is connected to the first terminal of the common mode inductor 203; the second terminal of the second POC circuit 202 is connected to the second terminal of the common mode inductor 203, and the third terminal of the second POC circuit 202 is connected to the first terminal of the microcontroller 201; the second terminal of the microcontroller 201 is connected to the first terminal of each LED high-side linear driver, the second terminal of each LED high-side linear driver is connected to the first terminal of the corresponding LED strip, the third terminal of the microcontroller 201 is connected to the second terminal of each LED strip, and the third terminal of each LED strip is grounded; the third terminal of the common mode inductor 203 is grounded, and the fourth terminal of the common mode inductor 203 is connected to the power supply 204 and to the third terminal of each LED high-side linear driver.

[0031] Among them, the microcontroller 201 is connected to the LED high-side linear driver through the ADIM interface (analog dimming interface) to control the working state of the LED driver and realize high-precision linear adjustment of LED brightness; the MCU201 is connected to the LED light strip to realize voltage detection.

[0032] In this embodiment, the boost circuit 103, POC circuit, and SOC of the cockpit domain controller 100 control the boost circuit 103 and the screen via I2C; the coaxial cable; the LED linear driver and POC circuit at the display screen 200 end, the MCU 201 control, and the common mode inductor 203 filter together form a low-cost display screen connection, power supply, and dimming control link.

[0033] In the cockpit domain controller, the voltage is boosted to the target boost voltage through the boost / buck-boost circuit and then supplied to the display screen 200 through the POC circuit. This significantly reduces the coaxial line current, reduces the demand for POC inductor current, and reduces the heat generation of the LED linear driver at the screen.

[0034] In the display screen, the high-frequency signal is separated from the DC power supply by the POC circuit, and the power supply and the ground of the coaxial line are connected to the common mode inductor 203 to supply power to the back end of the display screen 200, which significantly improves the anti-interference of the coaxial line. The LED high-side linear driver is used for dimming drive and short-circuit protection of the LCD backlight strip.

[0035] For further details, please refer to Figure 2 , Figure 2 This is a second schematic diagram of a vehicle-mounted display system provided in an embodiment of this application. Figure 2 As shown, the first POC circuit 102 includes a second capacitor C2, a first inductor L1, and a second inductor L2; The second terminal of the first POC circuit 102 is divided into two paths. One path is connected to the first inductor L1 and the second inductor L2 in sequence, and the other path is grounded through the second capacitor C2. The second inductor L2 and the first terminal of the first POC circuit 102 are connected to the third terminal of the first POC circuit 102.

[0036] A Power over Coax (POC) circuit is a key technology that simultaneously transmits power, high-speed video data, and control signals through a single coaxial cable. It can superimpose power signals with high-frequency video signals and low-frequency control signals and transmit them through the same coaxial cable. Specifically, the first POC circuit 102 can superimpose the power signal from the boost circuit 103 and the control commands from the SOC chip 101 and transmit them through the coaxial cable.

[0037] Furthermore, the second POC circuit 202 includes a third capacitor C3, a third inductor L3, and a fourth inductor L4; The first terminal of the second POC circuit 202 is divided into two paths. One path is connected to the third terminal of the second POC circuit 202, and the other path is connected to the third inductor L3 and the fourth inductor L4 in sequence. The fourth inductor L4 is connected to the third capacitor C3 and grounded, and the fourth inductor L4 is connected to the second terminal of the second POC circuit 202.

[0038] The second POC circuit 202 can decouple the power signal of the superimposed boost circuit 103 and the control command of the SOC chip 101 and transmit them separately.

[0039] Furthermore, the vehicle display system also includes a first capacitor C1, a fourth capacitor C4, a serializer 104, and a deserializer 206; The first terminal of the SOC chip 101 is connected to the first terminal of the first POC circuit 102 via the serializer 104 and the first capacitor C1; the third terminal of the second POC circuit 202 is connected to the first terminal of the microcontroller 201 via the fourth capacitor C4 and the deserializer 206. The first capacitor C1 and the fourth capacitor C4 serve as AC coupling capacitors in the circuit.

[0040] Furthermore, the in-vehicle display system also includes a first connector 105 and a second connector 205; The third terminal of the first POC circuit 102 is connected to the coaxial cable via the first connector 105; The coaxial cable connected to the display screen 200 is connected to the first end of the second POC circuit 202 via the second connector 205, and the outer shield of the coaxial cable is connected to the first end of the common mode inductor 203.

[0041] Furthermore, the vehicle display system also includes a high-side switch; the high-side switch is disposed between the second terminal of the boost circuit 103 and the second terminal of the first POC circuit 102. By adding a high-side switch with overcurrent protection supporting current detection at the front end of the POC circuit, power-related functional safety monitoring is achieved, reducing the inrush current at the moment the screen powers on.

[0042] Furthermore, the boost circuit 103 may include a boost / buck-boost circuit.

[0043] Furthermore, the in-vehicle display system also includes a fifth capacitor C5, a fifth inductor L5, and a sixth inductor L6; The fourth terminal of the common-mode inductor 203 is connected to the first terminal of the fifth capacitor C5, the first terminal of the fifth inductor L5, and the first terminal of the sixth inductor L6, respectively; the second terminal of the fifth capacitor C5 is grounded; and the second terminal of the fifth inductor L5 is connected to the power supply 204. The fifth capacitor C5, the fifth inductor L5, and the sixth inductor L6 are all grounded, serving as conductive emission filtering to further improve EMC performance.

[0044] The vehicle-mounted display system provided in this application has the following advantages: 1. Reduce costs: The boost circuit reduces the current requirement for POC inductors, thus reducing their cost; the use of LED linear drivers reduces material costs several times compared to backlight switching power supplies; and coaxial cables lower the material costs of power supply harnesses, connectors, and interface protection devices.

[0045] 2. Improve EMC performance: Reduced conducted and radiated emissions; the use of LED linear drivers eliminates input voltage fluctuations; there is no interference from conducted emissions from traditional backlight power supplies to the POC link signal; and radiated emissions from the display PCB and conducted emissions from the wiring harness are reduced.

[0046] To improve immunity, the entire PCB ground plane is routed back to the cockpit domain controller via a common-mode inductor. The ground of the coaxial cable shield and the power supply after the POC are connected together to the common-mode inductor for filtering before being input to the downstream load, improving immunity and reducing external emissions from the wiring harness. Compared to traditional screens powered by a separate power supply ground, this avoids the common-mode inductor ineffectiveness caused by negative current flowing back from the shield. Using an LED linear driver, compared to a backlight switching power supply, prevents voltage fluctuations from coupling onto the coaxial cable and affecting signal quality. This effectively improves common-mode immunity and reduces the probability of failure in BCI and radiated immunity tests.

[0047] 3. Feasibility of large-size screens: Existing POC circuits can be used. By precisely adjusting the boost voltage, the power supply link loss is reduced, and the current requirement of the inductor in the POC circuit is lowered. This allows the POC circuit and coaxial cable for automotive applications to meet the POC power supply requirements of larger screens, such as a 12.3-inch display with a rated voltage of 12V and 1A. The backlight is typically 24V and 300mA. Using this solution, the coaxial cable only needs to pass through 300mA of current, reducing the current requirement of the POC circuit.

[0048] 4. Reduced DC voltage drop loss of the coaxial cable: The requirements for coaxial cable impedance and length are reduced, eliminating the need for special coaxial cables with very low DC impedance. After reducing the bias current of the POC inductor and the wiring harness, the S-parameters are guaranteed to meet the chip requirements.

[0049] 5. Reduce display screen heat: The backlight driver of the display uses a combination of linear driver and host boost to drive multiple LED strips in series, which reduces PCB heat generation and significantly reduces the heat generation of the entire display. No additional heat dissipation measures are required, thus avoiding the risk of the screen getting too hot to touch.

[0050] 5. Improve display effect: Each light strip uses an individual linear LED driver, enabling highly efficient pure analog dimming at any brightness level, while ensuring LED current equalization, avoiding screen flicker, protecting eyes, and extending LED lifespan.

[0051] Please see Figure 3 , Figure 3 A flowchart illustrating an in-vehicle display method according to another embodiment of this application. Figure 3 As shown in the embodiments of this application, the in-vehicle display method provided is applied to any of the in-vehicle display systems described above; specifically, it includes: S301. The SOC chip generates a voltage control command based on the actual voltage value of each LED strip received and sends the voltage control command to the boost circuit to adjust the output voltage of the boost circuit.

[0052] S302, The SOC chip sends a brightness control command to the first POC circuit.

[0053] S303, the first POC circuit superimposes the power signal of the boost circuit and the brightness control command and transmits them to the second POC circuit via a coaxial cable.

[0054] S304. The second POC circuit decouples the power signal and the brightness control command, connects the power signal to the second terminal of the common mode inductor, and sends the brightness control command to the microcontroller.

[0055] S305. The microcontroller performs dimming control on the high-side linear driver of each LED according to the brightness control instruction to adjust the display brightness of each LED light strip; and detects the actual voltage value of each LED light strip and sends the actual voltage value of each LED light strip to the SOC chip.

[0056] This application's embodiments reveal that LED strips exhibit significant voltage drops due to variations in brightness, current, and overall voltage with temperature. For example, with nine LEDs connected in series, the voltage can vary between 24.3V and 29.7V. A fixed voltage output would result in excessive DC voltage loss when the strip voltage is low, necessitating real-time voltage adjustment. Specifically: 1. The cockpit domain controller transmits brightness information to the screen via I2C; 2. The display screen MCU adjusts the brightness; 3. The display screen MCU detects the LED strip voltage; 4. The display screen MCU feeds back the LED strip voltage to the cockpit domain controller via I2C; 5. The cockpit domain controller adjusts the boost voltage to the target value via I2C based on the LED strip voltage. This cycle repeats, with the MCU continuously monitoring the LED strip voltage and feeding it back to the cockpit domain controller via deserialization. The cockpit domain controller then adjusts the output voltage of the boost / buck-boost circuit based on the feedback voltage, reducing power supply losses, improving efficiency, and minimizing heat generation.

[0057] In practical implementation, the SOC chip determines the target voltage value by summing the actual voltage value, the line loss voltage value, and the minimum voltage drop value of the LED high-side linear driver, and generates the voltage control command based on the target voltage value.

[0058] Among them, the line loss voltage value and the minimum voltage drop value of the LED high-side linear driver are empirical parameters, which can be determined by means of device selection, experimental measurement, etc.

[0059] This application provides an in-vehicle display method that precisely adjusts the voltage of the power supply to the display screen's POC. Based on the detection and feedback of the LED voltage drop at the screen end, the cockpit domain controller SOC adjusts the POC power supply voltage.

[0060] Taking a 15.6-inch display as an example, the backlight consists of 6 parallel and 9 series connections, with a voltage of 30V, a current of 600mA, and a power consumption of 18W. Assuming a conversion efficiency of 85%, the power supply generates 2.7W of heat. In actual measurements, the PCB temperature reaches over 70℃ at full brightness. This solution uses voltage feedback from the MCU at the screen end and the voltage regulation link of the cockpit domain controller to precisely adjust the POC power supply voltage through software control. At maximum brightness, only the LED linear driver voltage drop of 0.5V multiplied by 600mA generates 0.3W of heat, which can significantly reduce the heat generation of the entire display. No additional heat dissipation measures are needed, thus avoiding the problem of the screen becoming too hot to touch.

[0061] By boosting the voltage and precisely regulating it, the power supply link loss is reduced, and the current requirement for the POC inductor is lowered, enabling the POC inductor and coaxial cable for automotive applications to meet the power supply needs of larger screens.

[0062] Please see Figure 4 ,Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 4 As shown, the electronic device 400 includes a processor 410, a memory 420, and a bus 430.

[0063] The memory 420 stores machine-readable instructions that can be executed by the processor 410. When the electronic device 400 is running, the processor 410 and the memory 420 communicate via the bus 430. When the machine-readable instructions are executed by the processor 410, the steps of the vehicle display method in the above method embodiment can be performed. For specific implementation methods, please refer to the method embodiment, which will not be repeated here.

[0064] This application also provides a computer-readable storage medium storing a computer program. When the computer program is run by a processor, it can execute the steps of the vehicle display method as described in the above method embodiments. For specific implementation details, please refer to the method embodiments, which will not be repeated here.

[0065] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0066] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0067] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0068] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0069] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0070] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A vehicle-mounted display system, characterized in that, include: The cockpit domain controller and the display screen are connected via a coaxial cable. The cockpit domain controller includes a SOC chip, a first POC circuit, and a boost circuit. The display screen includes a microcontroller, a second POC circuit, a common-mode inductor, at least one LED high-side linear driver, at least one LED strip, and a power supply. Each LED strip includes at least one LED bead. The at least one LED high-side linear driver and the at least one LED strip correspond one-to-one. The first terminal of the SOC chip is connected to the first terminal of the first POC circuit, the second terminal of the SOC chip is connected to the first terminal of the boost circuit, the second terminal of the boost circuit is connected to the second terminal of the first POC circuit, and the third terminal of the first POC circuit is connected to the display screen via a coaxial cable; the third terminal of the boost circuit is connected to an external power supply. A coaxial cable connected to the display screen is connected to the first terminal of the second POC circuit, and the outer shield of the coaxial cable is connected to the first terminal of the common-mode inductor. The second terminal of the second POC circuit is connected to the second terminal of the common-mode inductor, and the third terminal of the second POC circuit is connected to the first terminal of the microcontroller. The second terminal of the microcontroller is connected to the first terminal of each LED high-side linear driver, and the second terminal of each LED high-side linear driver is connected to the first terminal of the corresponding LED strip. The third terminal of the microcontroller is connected to the second terminal of each LED strip, and the third terminal of each LED strip is grounded. The third terminal of the common-mode inductor is grounded, and the fourth terminal of the common-mode inductor is connected to the power supply and the third terminal of each LED high-side linear driver.

2. The vehicle-mounted display system according to claim 1, characterized in that, The first POC circuit includes a second capacitor, a first inductor, and a second inductor; The second terminal of the first POC circuit is divided into two paths: one path is connected to the first inductor and the second inductor in sequence, and the other path is grounded through the second capacitor; the second inductor and the first terminal of the first POC circuit are connected to the third terminal of the first POC circuit.

3. The vehicle-mounted display system according to claim 1 or 2, characterized in that, The second POC circuit includes a third capacitor, a third inductor, and a fourth inductor; The first terminal of the second POC circuit is divided into two paths. One path is connected to the third terminal of the second POC circuit, and the other path is connected to the third inductor and the fourth inductor in sequence. The fourth inductor is connected to the third capacitor and grounded, and the fourth inductor is connected to the second terminal of the second POC circuit.

4. The vehicle-mounted display system according to claim 1, characterized in that, It also includes a first capacitor, a fourth capacitor, a serializer, and a deserializer; The first terminal of the SOC chip is connected to the first terminal of the first POC circuit via the serializer and the first capacitor; the third terminal of the second POC circuit is connected to the first terminal of the microcontroller via the fourth capacitor and the deserializer.

5. The vehicle-mounted display system according to claim 1, characterized in that, It also includes a first connector and a second connector; The third terminal of the first POC circuit is connected to the coaxial cable via the first connector; The coaxial cable connected to the display screen is connected to the first end of the second POC circuit via the second connector, and the outer shield of the coaxial cable is connected to the first end of the common mode inductor.

6. The vehicle-mounted display system according to claim 1, characterized in that, It also includes a high-side switch; the high-side switch is disposed between the second terminal of the boost circuit and the second terminal of the first POC circuit.

7. The vehicle-mounted display system according to claim 5, characterized in that, The boost circuit includes a boost / buck-boost circuit.

8. The vehicle-mounted display system according to claim 1, characterized in that, It also includes the fifth capacitor, the fifth inductor, and the sixth inductor; The fourth terminal of the common-mode inductor is connected to the first terminal of the fifth capacitor, the first terminal of the fifth inductor, and the first terminal of the sixth inductor, respectively; the second terminal of the fifth capacitor is grounded; and the second terminal of the fifth inductor is connected to the power supply.

9. A vehicle-mounted display method, characterized in that, Applied to the vehicle-mounted display system as described in any one of claims 1 to 8; the method includes: The SOC chip generates a voltage control command based on the actual voltage value of each LED strip received and sends the voltage control command to the boost circuit to adjust the output voltage of the boost circuit; The SOC chip sends a brightness control command to the first POC circuit; The first POC circuit superimposes the power signal of the boost circuit and the brightness control command and transmits them to the second POC circuit via a coaxial cable; The second POC circuit decouples the power signal and the brightness control command, connects the power signal to the second terminal of the common mode inductor, and sends the brightness control command to the microcontroller. The microcontroller performs dimming control on the high-side linear driver of each LED according to the brightness control command to adjust the display brightness of each LED light strip; and detects the actual voltage value of each LED light strip and sends the actual voltage value of each LED light strip to the SOC chip.

10. The vehicle-mounted display method according to claim 9, characterized in that, The SOC chip generates voltage control commands based on the received actual voltage value of each LED strip, including: The SOC chip determines the target voltage value by summing the actual voltage value, the line loss voltage value, and the minimum voltage drop value of the LED high-side linear driver, and generates the voltage control command based on the target voltage value.

Images