A circuit adapted to different in-vehicle remote screens and an in-vehicle central control display screen

Abstract

A circuit for adapting to different in-vehicle remote screens and an in-vehicle central control display screen, comprising: a host controller, a serializer, and a voltage acquisition module; the voltage acquisition module includes a single-pole double-throw switch; the moving end of the single-pole double-throw switch is connected to the A / D port of the host controller, the first fixed end of the single-pole double-throw switch is connected to a first DC power supply, the second fixed end of the single-pole double-throw switch is connected to the display screen circuit, and the host controller acquires the voltage of the A / D port; when the moving end is connected to the first fixed end, the host controller takes the acquired voltage as the reference voltage; when the moving end is connected to the second fixed end, the host controller takes the acquired voltage as the feedback voltage; the host controller compares the feedback voltage with the reference voltage to determine the resolution of the display screen. The present invention can automatically adapt to display screens with two resolutions, meeting the personalized customization needs of customers.

Description

Technical Field

[0001] The present invention relates to the field of automotive electronics technology, and particularly to a circuit adapted to different in-vehicle remote screens and an in-vehicle central control display screen. Background Art

[0002] With the rapid development of automotive electronics, the application of in-vehicle central control display screens in trucks has become increasingly popular. Due to limitations in vehicle models and the installation size of instrument panels, the central control display screen usually adopts a split installation design, such as a central control display screen including a host controller and a display screen. A high-speed differential signal line is used to connect the host controller and the display screen, and different lengths are used according to needs; while the data communication between the host controller and the display screen adopts the FPD-Link serializer / deserializer method to transmit and control remote high-speed data. Currently, relatively mature solutions include Maxim or TI, and twisted pair or coaxial cable is used as the transmission medium between the serializer and the deserializer to achieve the transmission of high-speed signals, enabling the display screen to be several meters away from the host controller. In the actual application process, due to different vehicle models, configurations, and price ranges, customers need to be able to equip two different-resolution display screens on the basis of sharing a host controller. For mid-range vehicle models, the host controller needs to be equipped with a display screen with a resolution of 720P (such as 1280*720), while for high-end vehicle models, the host controller needs to be equipped with a display screen with a resolution of 1080P (1920*1080). The existing general method is to upgrade the software again after installation on the basis of sharing the host hardware. For two different-resolution display screens, two different software versions are upgraded for the host, so as to realize that one host can be adapted to two display screens of 720P (1280*720) and 1080P (1920*1080) at the same time. The existing processing method is that for customers, during the installation process, software needs to be upgraded, and it is easy to make mistakes during the software upgrade process, and it also wastes working hours. To solve this problem, a circuit adapted to different in-vehicle remote screens and an in-vehicle central control display screen are needed, so that the host controller can automatically match two different-resolution display screens, facilitating installation and debugging on the vehicle and meeting the customized needs of customers. Summary of the Invention

[0003] The main object of the present invention is to propose a circuit adapted to different in-vehicle remote screens and an in-vehicle central control display screen, which can automatically adapt to two display screens with different resolutions and meet the personalized customization needs of customers.

[0004] The present invention adopts the following technical solutions:

[0005] On the one hand, a circuit for adapting to different in-vehicle remote screens according to the present invention includes: a host controller, a serializer, and a voltage acquisition module; the voltage acquisition module includes a single-pole double-throw switch; the moving end of the single-pole double-throw switch is connected to the A / D port of the host controller, the first fixed end of the single-pole double-throw switch is connected to a first DC power supply, the second fixed end of the single-pole double-throw switch is connected to the display screen circuit, the control end of the single-pole double-throw switch is connected to an I / O port of the host controller, and the host controller acquires the voltage of the A / D port; when the moving end of the single-pole double-throw switch is connected to the first fixed end, the host controller takes the acquired voltage as the reference voltage; when the moving end of the single-pole double-throw switch is connected to the second fixed end, the host controller takes the acquired voltage as the feedback voltage; the host controller compares the feedback voltage with the reference voltage to determine the resolution of the display screen; the host controller is connected to the serializer to send corresponding EDID data according to the resolution; the serializer converts the EDID data into a high-speed differential signal and sends it to the display screen circuit.

[0006] Preferably, the voltage acquisition module further includes: a first resistor, an eighth resistor, a fifth resistor, and a ninth resistor; one end of the first resistor and one end of the eighth resistor are both connected to the A / D port of the host controller; the other end of the eighth resistor is connected to the moving end of the single-pole double-throw switch; the second fixed end of the single-pole double-throw switch is connected to one end of the fifth resistor, and the other end of the fifth resistor is respectively connected to one end of the ninth resistor and the display screen circuit; the other end of the ninth resistor is connected to a second DC power supply; the other end of the first resistor is grounded.

[0007] Preferably, the voltage acquisition module further includes: a voltage stabilizing diode; the anode of the voltage stabilizing diode is connected to the other end of the first resistor, and the cathode of the voltage stabilizing diode is connected to the A / D port.

[0008] Preferably, the voltage acquisition module further includes: a seventh resistor; one end of the seventh resistor is connected to the I / O port, and the other end of the seventh resistor is grounded.

[0009] Preferably, the first DC power supply is less than the second DC power supply.

[0010] Preferably, the circuit further includes: a first power supply module; the enable end of the first power supply module is connected to an I / O port of the host controller; the output end of the first power supply module is connected to the display screen circuit for power supply.

[0011] On the other hand, a vehicle-mounted central control display screen of the present invention includes: a circuit adapted to different vehicle-mounted remote screens, and further includes a display screen circuit; the display screen circuit includes a deserialiser and a display screen; the deserialiser is connected to the serializer to receive the high-speed differential signal; the deserialiser resolves the high-speed differential signal and sends it to the display screen.

[0012] Preferably, the vehicle-mounted central control display screen further includes: a third HSD communication interface connected to the deserialiser; two output ends of the serializer are connected to a third terminal and a fourth terminal of the third HSD communication interface through a third high-speed common mode choke; the other two output ends of the serializer are connected to a fifth terminal and a sixth terminal of the third HSD communication interface through a fourth high-speed common mode choke; the voltage acquisition module is connected to the fifth terminal or the sixth terminal of the third HSD communication interface.

[0013] Preferably, the vehicle-mounted central control display screen further includes: a first HSD communication interface or a second HSD communication interface connected to the third HSD communication interface;

[0014] When the resolution of the display screen is a first resolution, the third terminal of the third HSD communication interface is connected to the third terminal of the first HSD communication interface, the fourth terminal of the third HSD communication interface is connected to the fourth terminal of the first HSD communication interface, the fifth terminal of the third HSD communication interface is connected to the sixth terminal of the first HSD communication interface, and the sixth terminal of the third HSD communication interface is connected to the fifth terminal of the first HSD communication interface; the third terminal and the fourth terminal of the first HSD communication interface are connected to two input ends of the deserialiser through a first high-speed common mode choke, and the fifth terminal and the sixth terminal of the first HSD communication interface are connected to the other two input ends of the deserialiser through a second high-speed common mode choke; the deserialiser outputs two LVDS signals to the display screen;

[0015] When the resolution of the display screen is a second resolution, the third terminal of the third HSD communication interface is connected to the fifth terminal of the second HSD communication interface, the fourth terminal of the third HSD communication interface is connected to the sixth terminal of the second HSD communication interface, the fifth terminal of the third HSD communication interface is connected to the third terminal of the second HSD communication interface, and the sixth terminal of the third HSD communication interface is connected to the fourth terminal of the second HSD communication interface; the third terminal and the fourth terminal of the second HSD communication interface are both grounded, and the fifth terminal and the sixth terminal of the second HSD communication interface are connected to two input ends of the deserialiser through a ninth high-speed common mode choke; the deserialiser outputs one LVDS signal to the display screen.

[0016] Preferably, the display screen circuit further includes: a second power supply module; the second power supply module is connected to the deserialization unit and the display screen to supply power.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] A circuit for adapting to different in-vehicle remote screens and an in-vehicle central control display screen according to the present invention can enable the host controller to automatically adapt to in-vehicle display screens with two different resolutions (720P and 1080P), meeting the personalized customization needs of customers; during the installation process of adapting to two different display screens in a vehicle factory, there is no need to replace the host controller, no need to replace the wiring harness, and no need to upgrade the software to different versions. Only the display screen needs to be directly replaced; it has the advantages of high recognition rate and strong automatic adaptability.

[0019] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specific embodiments of the present invention are listed.

[0020] According to the following detailed description of the specific embodiments of the present invention in conjunction with the drawings, those skilled in the art will understand the above and other purposes, advantages and features of the present invention more clearly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a circuit diagram of an embodiment of the present invention;

[0022] Figure 2 It is a detection flow chart of an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the drawings.

[0024] See Figure 1As shown in the figure, on the one hand, a circuit of the present invention adapted to different in-vehicle remote screens includes: a host controller U1, a serializer U2, and a voltage acquisition module; the voltage acquisition module includes a single-pole double-throw switch K1; the moving end A1 of the single-pole double-throw switch K1 is connected to the A / D1 port of the host controller U1, the first fixed end B1 of the single-pole double-throw switch K1 is connected to the first DC power supply VCC3V3, the second fixed end C1 of the single-pole double-throw switch K1 is connected to the display screen circuit, the control end S1 of the single-pole double-throw switch K1 is connected to an I / O port of the host controller U1, and the host controller U1 acquires the voltage of the A / D1 port; when the moving end A1 of the single-pole double-throw switch K1 is connected to the first fixed end B1, the host controller U1 uses the acquired voltage as the reference voltage; when the moving end A1 of the single-pole double-throw switch K1 is connected to the second fixed end C1, the host controller U1 uses the acquired voltage as the feedback voltage; the host controller U1 compares the feedback voltage with the reference voltage to determine the resolution of the display screen; the host controller U1 is connected to the serializer U2 to send corresponding EDID data and drive data according to the resolution; the serializer U2 converts the EDID data and drive data into high-speed differential signals and sends them to the display screen circuit.

[0025] In this embodiment, the voltage acquisition module further includes: a first resistor R1, an eighth resistor R8, a fifth resistor R5, and a ninth resistor R9; one end of the first resistor R1 and one end of the eighth resistor R8 are both connected to the A / D port of the host controller U1; the other end of the eighth resistor R8 is connected to the moving end A1 of the single-pole double-throw switch K1; the second fixed end C1 of the single-pole double-throw switch K1 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to one end of the ninth resistor R9 and the display screen circuit respectively; the other end of the ninth resistor R9 is connected to the second DC power supply VCC; the other end of the first resistor R1 is grounded.

[0026] Specifically, the host controller U1 internally includes a CPU, DDR3, EMMC, PMIC, etc. The host controller U1 has audio and video encoding and decoding functions, including dual-channel LVDS interfaces, HDMI interfaces, and MIPI interfaces, as well as combined circuits including WIFI, Bluetooth, GPS, etc. In practice, it runs on the Android platform. I / O1 is the internal GPIO port output of the CPU, and A / D1 is the internal A / D acquisition port of the CPU, which is used to acquire the voltage value at point A, and the value is VA.

[0027] The serializer U2 is an FPD-Link serializer U2 (such as TI's DS90UB949Q-Q1). I2C communication and HDMI signal communication are carried out inside the host controller U1 and the serializer U2. During power-on initialization, the host controller U1 initializes the serializer U2 by configuring relevant registers through I2C. After power-on, the host controller U1 processes the data based on the voltage value collected by A / D1, determines the resolution of the display screen, calls the pre-set relevant EDID (Extended Display Identification Data, which provides almost all display parameters and consists of 128 bytes) data, and finally converts the HDMI information into serial data through the serializer U2 and sends it to the corresponding display screen for display. If the resolution of the display screen is determined to be 720P, the EDID data corresponding to the 720P display is sent to the serializer U2. If the resolution of the display screen is determined to be 1080P, the EDID data corresponding to the 1080P display is sent to the serializer U2.

[0028] In the default state, the control terminal S1 is 0, and the moving terminal A1 of the single-pole double-throw switch K1 is connected to the first fixed terminal B1; when the control terminal S1 is set to 1, the moving terminal A1 of the single-pole double-throw switch K1 is connected to the second fixed terminal C1. In actual application, the single-pole double-throw switch K1 can be implemented by a MOS transistor or a relay.

[0029] The host controller U1 compares the feedback voltage with the reference voltage to determine the resolution of the display screen, specifically including:

[0030] Let the voltage value at point A be VA, the voltage value at point B be VB = VCC3V3, and the voltage value at point C be VC. When the single-pole double-throw switch K1 is in the default state (A1 and B1 are connected), the VA value collected by the host controller U1 at point A is VAB, and VAB = VB*R1 / (R1 + R8) = VCC3V3*R1 / (R1 + R8). This value is used as the reference voltage and stored in the internal memory of the CPU. When the single-pole double-throw switch K1 is in the switching state (A1 and C1 are connected), the VA value collected by the host controller U1 at point A is VAC. When the resolution of the display screen is different, the voltage value of VAC has the situation of VAC = VCC*R1 / (R1 + R8 + R5 + R9) or VAC = 0. The host controller U1 compares VAC with VAB, and then it can judge which resolution of the display screen the current host controller U1 is connected to. For example, when VAC = VC*R1 / (R1 + R8 + R5) = VCC*R1 / (R1 + R8 + R5 + R9), subtraction calculation is performed with the reference voltage, and it is represented by VX, then VX = VAC - VAB. At this time, VX > 0 (because in actual applications, VCC is generally 12V or 24V, while VCC3V3 is 3.3V, achieved by adjusting the fifth resistor R5 and the ninth resistor R9). Therefore, if the difference VX between the feedback voltage and the reference voltage is VX > 0, it means that the resolution of the connected display screen is 1080P; when VAC = 0, subtraction calculation is performed on the feedback voltage and the reference voltage, VX = 0 - VAB, and at this time VX < 0. Therefore, if the difference VX between the feedback voltage and the reference voltage is VX < 0, it means that the resolution of the connected display screen is 720P.

[0031] See Figure 2 As shown, the detection and comparison steps of the host controller U1 are as follows:

[0032] After the device is powered on and initialized, the host controller U1 pulls down I / O1, and A / D1 collects the current voltage value VAB and stores it in the internal memory.

[0033] The host controller U1 pulls up I / O1, and A / D1 collects the current voltage value VAC. The host controller U1 performs internal calculations, VX = VAC - VAB. At the same time, the host controller U1 makes an internal judgment. When VX > 0, it means the host controller U1 is connected to the U5 display screen (1920*1080), then the relevant EDID data and related drivers of U5 are called to initialize U5 and achieve normal display; when VX < 0, it means the host controller U1 is connected to the U8 display screen (1280*720), then the relevant EDID data and related drivers of U8 are called to initialize U8 and achieve normal display. The purpose of collecting and assigning values twice during power-on and performing difference calculations and judgments is to improve the accuracy of software judgment, and the software does not need to increase the algorithm due to the setting of the error range; because each time the device is powered on, there may be fluctuations in the power supply, resulting in differences in the voltage values collected each time, and the differences in voltage values may cause software misjudgment, or the value is not within the set error range, thus resulting in the problem that the relevant drivers cannot be normally called and executed.

[0034] Further, the voltage acquisition module further includes: a voltage stabilizing diode D1; the anode of the voltage stabilizing diode D1 is connected to the other end of the first resistor R1, and the cathode of the voltage stabilizing diode D1 is connected to the A / D port.

[0035] In this embodiment, the voltage stabilizing value of the voltage stabilizing diode D1 can be taken as 3.3V, and the voltage stabilizing diode D1 ensures that the voltage at point A does not exceed the highest power supply voltage of the host controller U1.

[0036] Further, the voltage acquisition module further includes: a seventh resistor R7; one end of the seventh resistor R7 is connected to the I / O port, and the other end of the seventh resistor R7 is grounded.

[0037] The seventh resistor R7 is a pull-down resistor, ensuring that the I / O1 port of the host controller U1 is low at the moment of power-on.

[0038] Further, the first DC power supply VCC3V3 is less than the second DC power supply VCC. In this embodiment, the first DC power supply VCC3V3 can be taken as 3.3V, and the second DC power supply VCC can be taken as 12V or 24V.

[0039] Further, the circuit further includes: a first power supply module U3; the enable end of the first power supply module U3 is connected to an I / O port of the host controller U1; the output end of the first power supply module U3 is connected to the display screen circuit for power supply. The first power supply module U3 is controlled by the I / O1 of the host controller U1. When I / O1 is high, it outputs the second DC power supply VCC, and when I / O1 is low, it does not output power.

[0040] Further, the circuit further includes: a fifth inductor L5, a sixth inductor L6, a seventh inductor L7, an eighth inductor L8, a second resistor R2, and a third resistor R3. The seventh inductor L7 and the eighth inductor L8 are beads with different impedances; the inductance of the fifth inductor L5 is much larger than that of the sixth inductor L6; the second resistor R2 and the third resistor R3 are inductance parallel resistors for adjusting the Q value of the inductor. In actual application, inductors with different inductance values and Q values are selected according to needs. The purpose of using the fifth inductor L5, the sixth inductor L6, the seventh inductor L7, the eighth inductor L8, the second resistor R2, and the third resistor R3 is to prevent the power supply from affecting the high-speed signal, so that when there is a high-speed signal transmitted on the differential line, it is not affected. For high frequencies, these form a high-impedance path, and for the DC power supply, it is not affected.

[0041] Further, the circuit further includes: a third high-speed common-mode choke L3 and a fourth high-speed common-mode choke L4, and the third high-speed common-mode choke L3 and the fourth high-speed common-mode choke L4 are used to filter out common-mode interference.

[0042] Further, the circuit further includes: a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, and a fifteenth capacitor C15. The fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, and the eighth capacitor C8 are high-frequency coupling capacitors with the function of blocking direct current; the ninth capacitor C9, the twelfth capacitor C12, the thirteenth capacitor C13, the fourteenth capacitor C14, and the fifteenth capacitor C15 are filter capacitors, and the thirteenth capacitor C13, the fourteenth capacitor C14, and the fifteenth capacitor C15 are selected in a certain multiple to increase the filtering bandwidth.

[0043] See Figure 1 As shown, on the other hand, a vehicle-mounted central control display screen according to the present invention includes: the circuit adapted to different vehicle-mounted remote screens, and further includes a display screen circuit; the display screen circuit includes a deserialiser and a display screen; the deserialiser is connected to the serializer U2 to receive the high-speed differential signal; the deserialiser analyzes the high-speed differential signal and then sends it to the display screen.

[0044] Further, the in-vehicle center control display screen further includes: a third HSD communication interface J3 connected to the deserialization unit; two output terminals of the serializer U2 are connected to a third terminal J3_3 and a fourth terminal J3_4 of the third HSD communication interface J3 through a third high-speed common mode choke L3; the other two output terminals of the serializer U2 are connected to a fifth terminal J3_5 and a sixth terminal J3_6 of the third HSD communication interface J3 through a fourth high-speed common mode choke L4; the voltage acquisition module is connected to the fifth terminal J3_5 or the sixth terminal J3_6 of the third HSD communication interface J3.

[0045] Further, the in-vehicle center control display screen further includes: a first HSD communication interface J1 or a second HSD communication interface J2 connected to the third HSD communication interface J3;

[0046] When the resolution of the display screen is the first resolution, a third terminal J3_3 of the third HSD communication interface J3 is connected to a third terminal J1_3 of the first HSD communication interface J1, a fourth terminal J3_4 of the third HSD communication interface J3 is connected to a fourth terminal J1_4 of the first HSD communication interface J1, a fifth terminal J3_5 of the third HSD communication interface J3 is connected to a sixth terminal J1_6 of the first HSD communication interface J1, and a sixth terminal J3_6 of the third HSD communication interface J3 is connected to a fifth terminal J1_5 of the first HSD communication interface J1; the third terminal J1_3 and the fourth terminal J1_4 of the first HSD communication interface J1 are connected to two input terminals of the deserialization unit U4 through a first high-speed common mode choke L1, and the fifth terminal J1_5 and the sixth terminal J1_6 of the first HSD communication interface J1 are connected to the other two input terminals of the deserialization unit U4 through a second high-speed common mode choke L2; the deserialization unit U4 outputs two LVDS signals (LVDS1 and LVDS2) to the display screen U5;

[0047] When the resolution of the display screen is the second resolution, the third terminal J3_3 of the third HSD communication interface J3 is connected to the fifth terminal J2_5 of the second HSD communication interface J2, the fourth terminal J3_4 of the third HSD communication interface J3 is connected to the sixth terminal J2_6 of the second HSD communication interface J2, the fifth terminal J3_5 of the third HSD communication interface J3 is connected to the third terminal J2_3 of the second HSD communication interface J2, and the sixth terminal J3_6 of the third HSD communication interface J3 is connected to the fourth terminal J2_4 of the second HSD communication interface J2; the third terminal J2_3 and the fourth terminal J2_4 of the second HSD communication interface J2 are both grounded, and the fifth terminal J2_5 and the sixth terminal J2_6 of the second HSD communication interface J2 are connected to the two input terminals of the deserialization unit U7 through the ninth high-speed common-mode choke L9; the deserialization unit U7 outputs a LVDS signal to the display screen U8.

[0048] Figure 1 shows the connection of the circuit adapting to different in-vehicle remote screens with the circuits of the two display screens, where the 1080P display screen U5 is included in the first display screen circuit, and the 720P display screen U8 is included in the second display screen circuit. In practical applications, only the first display screen circuit or the second display screen circuit is connected.

[0049] In this embodiment, U4 is an FPD-Link deserialization unit (such as DS90UB948Q-Q1 of TI); U5 is a liquid crystal display screen with a capacitive screen and a resolution of 1920*1080. The dual-channel LVDS signals parsed from U4 are input to U5 for display to achieve human-computer interaction.

[0050] U7 is an FPD-Link deserialization unit (such as DS90UB928Q-Q1 of TI); U8 is a liquid crystal display screen with a capacitive screen and a resolution of 1280*720. The single-channel LVDS signal parsed from U7 is input to U8 for display to achieve human-computer interaction.

[0051] The third HSD communication interface J3 is a 4+2 HSD connector such as (TE: 2315834); where: J3_1 is connected to GND, and J3_2 is connected to the second DC power supply VCCVCC; J3_3 is DOUT1_P, J3_4 is DOUT1_N, which is one set of high-speed differential signal outputs of serializer U2; J3_5 is DOUT2_P, J3_6 is DOUT2_N; which is another set of high-speed differential signal outputs of serializer U2. When the host controller U1 is equipped with a 1080P display screen, two sets of differential outputs (DOUT1_P, DOUT1_N; DOUT2_P, DOUT2_N) are required to achieve sufficient data bandwidth; when the host controller U1 is equipped with a 720P display screen, only one set of differential outputs (default is DOUT1_P, DOUT1_N) is needed.

[0052] The first HSD communication interface J1 is a 4+2 HSD connector such as (TE: 2315239), where: J1_1 is connected to GND, and J1_2 is connected to the second DC power supply VCCVCC; J1_3 is RIN1_P, J1_4 is RIN1_N, which is one set of high-speed differential signal inputs of U4; J1_5 is RIN2_P, J1_6 is RIN2_N; which is another set of high-speed differential signal inputs of U4.

[0053] If the display screen adapted by the host controller U1 is U5, then J3_1, J3_2, J3_3, J3_4, J3_5, J3_6 are respectively connected to J1_1, J1_2, J1_3, J1_4, J1_5, J1_6; where the high-speed differential line groups are respectively connected with differential lines with an impedance of 100 ohms.

[0054] The second HSD communication interface J2 is a 4+2 HSD connector such as (TE: 2315239), where: J2_1 is connected to GND, and J2_2 is connected to the second DC power supply VCCVCC; J2_5 is RIN3_P, J2_6 is RIN3_N, which is one set of high-speed differential signal inputs of U7; J2_3 is grounded through the fourth resistor R4, and J2_4 is grounded through the sixth resistor R6.

[0055] If the display screen adapted by the host controller U1 is U8, then J3_1, J3_2, J3_3, J3_4, J3_5, J3_6 are respectively connected to J2_1, J2_2, J2_5, J2_6, J2_3, J2_4; where the high-speed differential line groups are respectively connected with differential lines with an impedance of 100 ohms.

[0056] Among them, the first high-speed common-mode choke L1, the second high-speed common-mode choke L2, and the ninth high-speed common-mode choke L9 are used to filter out common-mode interference. The first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the tenth capacitor C10, and the eleventh capacitor C11 are high-frequency coupling capacitors and have a DC-blocking effect.

[0057] The display screen circuit further includes: a second power supply module; the second power supply module is connected to the deserialiser and the display screen to supply power. Specifically, the second power supply module U6 is connected to the deserialiser U4 and the display screen U5 to supply power; the second power supply module U9 is connected to the deserialiser U7 and the display screen U8 to supply power.

[0058] The present invention utilises the frequency characteristics and Q-value characteristics of inductors, such that during high-speed transmission, the adaptation circuit itself does not affect the high-speed transmission signal; at the same time, A / D acquisition technology, I / O port control technology, and the pass-through control technology of the FPD-Link serializer U2 / deserializer (configuring relevant internal registers can achieve data pass-through between the serializer and the deserializer) are adopted, and different-resolution display screens are used. During high-speed serial data transmission, the amount of data to be transmitted is different, such that the number of differential pairs used is also different. When the host controller U1 is connected to the display screen U5 (1920*1080), in order to achieve sufficient data bandwidth, two sets of differential signal pairs (such as DOUT1_P, DOUT1_N and DOUT2_P, DOUT2_N) must be used for transmission; when the host controller U1 is equipped with the U8 display screen (1280*720), only one set of differential signal pairs (such as DOUT1_P, DOUT1_N) is required to meet the data bandwidth requirements. At this time, the other unused differential pair (DOUT2_P, DOUT2_N) is grounded to achieve the difference in hardware connections for the two display screens; finally, through this difference, after passing through the relevant control circuit and A / D acquisition, and processing the acquired data, the CPU of the host controller U1 detects and judges this difference to identify whether the currently connected display screen is U5 or U8. Finally, after the CPU determines which resolution display screen it is, it then calls the corresponding EDID data pre-stored inside the CPU to achieve normal display adaptation for the current display screen, thereby enabling the host controller U1 to automatically adapt to two different-resolution remote screens.

[0059] The above is only the specific implementation manner of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification made to the present invention using this concept shall fall within the scope of infringement of the protection of the present invention.

Claims

1. A circuit adapted to different in-vehicle remote screens, characterized in that, Comprising: A host controller, a serializer, and a voltage acquisition module; the voltage acquisition module includes a single-pole double-throw switch; the moving end of the single-pole double-throw switch is connected to the A / D port of the host controller, the first fixed end of the single-pole double-throw switch is connected to a first DC power supply, the second fixed end of the single-pole double-throw switch is connected to the display screen circuit, the control end of the single-pole double-throw switch is connected to an I / O port of the host controller, and the host controller acquires the voltage of the A / D port; when the moving end of the single-pole double-throw switch is connected to the first fixed end, the host controller takes the acquired voltage as a reference voltage; When the moving end of the single-pole double-throw switch is connected to the second fixed end, the host controller takes the acquired voltage as a feedback voltage; The host controller compares the feedback voltage with the reference voltage to determine the resolution of the display screen; the host controller is connected to the serializer to send corresponding EDID data according to the resolution; the serializer converts the EDID data into a high-speed differential signal and sends it to the display screen circuit.

2. The circuit for adapting to different in-vehicle remote screens according to claim 1, wherein The voltage acquisition module further includes: a first resistor, an eighth resistor, a fifth resistor, and a ninth resistor; one end of the first resistor and one end of the eighth resistor are both connected to the A / D port of the host controller; the other end of the eighth resistor is connected to the moving end of the single-pole double-throw switch; the second fixed end of the single-pole double-throw switch is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to one end of the ninth resistor and the display screen circuit respectively; the other end of the ninth resistor is connected to a second DC power supply; the other end of the first resistor is grounded.

3. The circuit for adapting to different in-vehicle remote screens according to claim 2, characterized in that, The voltage acquisition module further includes: a voltage stabilizing diode; the anode of the voltage stabilizing diode is connected to the other end of the first resistor, and the cathode of the voltage stabilizing diode is connected to the A / D port.

4. The circuit for adapting to different in-vehicle remote screens according to claim 2, characterized in that, The voltage acquisition module further includes: a seventh resistor; one end of the seventh resistor is connected to the I / O port, and the other end of the seventh resistor is grounded.

5. The circuit for adapting different in-vehicle remote screens according to claim 2, characterized in that, The first DC power supply is less than the second DC power supply.

6. The circuit for adapting to different in-vehicle remote screens according to claim 1, characterized in that The circuit further includes: a first power supply module; the enable end of the first power supply module is connected to an I / O port of the host controller; the output end of the first power supply module is connected to the display screen circuit for power supply.

7. A vehicle-mounted center control display screen, characterized in that, Comprising: The circuit for adapting to different in-vehicle remote screens according to any one of claims 1 to 6 further includes a display screen circuit; the display screen circuit includes a deserialiser and a display screen; the deserialiser is connected to the serializer to receive the high-speed differential signal; the deserialiser analyzes the high-speed differential signal and sends it to the display screen.

8. The in-vehicle central control display screen according to claim 7, characterized in that, The in-vehicle central control display screen further includes: a third HSD communication interface connected to the deserialization device; two output terminals of the serialization device are connected to a third terminal and a fourth terminal of the third HSD communication interface through a third high-speed common mode choke; the other two output terminals of the serialization device are connected to a fifth terminal and a sixth terminal of the third HSD communication interface through a fourth high-speed common mode choke; the voltage acquisition module is connected to the fifth terminal or the sixth terminal of the third HSD communication interface.

9. The in-vehicle central control display screen according to claim 8, wherein, The in-vehicle central control display screen further includes: a first HSD communication interface or a second HSD communication interface connected to the third HSD communication interface; When the resolution of the display screen is a first resolution, the third terminal of the third HSD communication interface is connected to the third terminal of the first HSD communication interface, the fourth terminal of the third HSD communication interface is connected to the fourth terminal of the first HSD communication interface, the fifth terminal of the third HSD communication interface is connected to the sixth terminal of the first HSD communication interface, and the sixth terminal of the third HSD communication interface is connected to the fifth terminal of the first HSD communication interface; the third terminal and the fourth terminal of the first HSD communication interface are connected to two input terminals of the deserialization device through a first high-speed common mode choke, and the fifth terminal and the sixth terminal of the first HSD communication interface are connected to the other two input terminals of the deserialization device through a second high-speed common mode choke; the deserialization device outputs two LVDS signals to the display screen; When the resolution of the display screen is a second resolution, the third terminal of the third HSD communication interface is connected to the fifth terminal of the second HSD communication interface, the fourth terminal of the third HSD communication interface is connected to the sixth terminal of the second HSD communication interface, the fifth terminal of the third HSD communication interface is connected to the third terminal of the second HSD communication interface, and the sixth terminal of the third HSD communication interface is connected to the fourth terminal of the second HSD communication interface; the third terminal and the fourth terminal of the second HSD communication interface are both grounded, and the fifth terminal and the sixth terminal of the second HSD communication interface are connected to two input terminals of the deserialization device through a ninth high-speed common mode choke; the deserialization device outputs one LVDS signal to the display screen.

10. The in-vehicle central control display screen according to claim 7, wherein, The display screen circuit further includes: a second power supply module; the second power supply module is connected to the deserialization device and the display screen to supply power.

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