CN113968188A - Circuit adaptive to different vehicle-mounted remote screens and vehicle-mounted central control display screen - Google Patents

Abstract

The utility model provides a circuit and on-vehicle well accuse display screen of different on-vehicle remote screens of adaptation, includes: the device comprises a host controller, a serializer and a voltage acquisition module; the voltage acquisition module comprises a single-pole double-throw switch; the active end of the single-pole double-throw switch is connected with an A/D port of a host controller, the first inactive end of the single-pole double-throw switch is connected with a first direct-current power supply, the second inactive end of the single-pole double-throw switch is connected with a display screen circuit, and the host controller acquires the voltage of the A/D port; when the movable end is connected with the first fixed end, the host controller takes the collected voltage as a reference voltage; when the movable end is connected with the second fixed end, the host controller takes the collected voltage as a feedback voltage; and the host controller compares the feedback voltage with the reference voltage to judge the resolution of the display screen. The invention can realize the automatic adaptation of the display screens with two resolutions and meet the individual customization requirements of customers.

Description

Circuit adaptive to different vehicle-mounted remote screens and vehicle-mounted central control display screen

Technical Field

The invention relates to the technical field of automotive electronics, in particular to a circuit adaptive to different vehicle-mounted remote screens and a vehicle-mounted central control display screen.

Background

With the rapid development of automotive electronics, the use of an on-board central control display screen on a truck is becoming more and more popular. Due to the limitations of the vehicle type and the installation size of the instrument panel, the central control display screen is usually designed to be split, for example, one central control display screen includes a host controller and a display screen. The host controller and the display screen are connected by adopting a high-speed differential signal wire, and different lengths are used according to requirements; and the data communication between the host controller and the display screen adopts an FPD-Link serializer/deserializer mode to carry out remote high-speed data transmission and control. The most mature scheme at present is Maxim or TI, and twisted-pair wires or coaxial wires are adopted between a serializer and a deserializer as transmission media to realize the transmission of high-speed signals, so that a display screen can be far away from a host controller by more than a few meters. In the actual application process, due to different vehicle types and different configurations and prices, a customer needs to be provided with two display screens with different resolutions on the basis of sharing one host controller. For medium-grade vehicle models, the host controller needs to be equipped with a display screen with 720P (e.g., 1280 × 720) resolution, and for high-grade vehicle models, the host controller needs to be equipped with a display screen with 1080P (1920 × 1080) resolution. In the existing general method, on the basis of sharing host hardware, after installation is completed, a client is allowed to upgrade software, two display screens with different resolutions are upgraded for a host, and thus, one host can be simultaneously adapted to two display screens of 720P (1280 × 720) and 1080P (1920 × 1080). The existing processing method needs software upgrading during installation for a client, errors are easy to occur during the software upgrading process, and working hours are wasted. To this problem, need the circuit of the different on-vehicle remote screens of an automatic adaptation and on-vehicle well accuse display screen for the host computer controller can match the display screen of two kinds of different resolutions automatically, makes things convenient for installation and debugging on the car, satisfies customer's customized demand.

Disclosure of Invention

The invention mainly aims to provide a circuit adapting to different vehicle-mounted remote screens and a vehicle-mounted central control display screen, which can automatically adapt to the display screens with two resolutions and meet the personalized customization requirements of customers.

The invention adopts the following technical scheme:

in one aspect, the invention provides a circuit adapted to different vehicle-mounted remote screens, comprising: the device comprises a host controller, a serializer and a voltage acquisition module; the voltage acquisition module comprises a single-pole double-throw switch; the movable end of the single-pole double-throw switch is connected with an A/D port of the host controller, the first immovable end of the single-pole double-throw switch is connected with a first direct-current power supply, the second immovable end of the single-pole double-throw switch is connected with a display screen circuit, the control end of the single-pole double-throw switch is connected with an I/O port of the host controller, and the host controller collects the voltage of the A/D port; when the movable end of the single-pole double-throw switch is connected with the first fixed end, the host controller takes the collected voltage as a reference voltage; when the movable end of the single-pole double-throw switch is connected with the second fixed end, the host controller takes the collected voltage as a feedback voltage; the host controller compares the feedback voltage with the reference voltage to judge the resolution of the display screen; the host controller is connected with the serializer to send corresponding EDID data according to the resolution; and the serializer converts the EDID data into a high-speed differential signal and sends the high-speed differential signal to the display screen circuit.

Preferably, the voltage acquisition module further comprises: 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 with an A/D port of the host controller; the other end of the eighth resistor is connected with the moving end of the single-pole double-throw switch; a second fixed end of the single-pole double-throw switch is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with one end of the ninth resistor and the display screen circuit respectively; the other end of the ninth resistor is connected with a second direct-current power supply; the other end of the first resistor is grounded.

Preferably, the voltage acquisition module further comprises: a voltage regulator tube; the anode of the voltage-stabilizing tube is connected with the other end of the first resistor, and the cathode of the voltage-stabilizing tube is connected with the A/D port.

Preferably, the voltage acquisition module further comprises: a seventh resistor; one end of the seventh resistor is connected with the I/O port, and the other end of the seventh resistor is grounded.

Preferably, the first dc power supply is smaller than the second dc power supply.

Preferably, the circuit further comprises: a first power supply module; the enabling end of the first power supply module is connected with an I/O port of the host controller; the output end of the first power supply module is connected with the display screen circuit to supply power.

In another aspect, the present invention provides a vehicle-mounted central control display screen, including: the circuit adapted to different vehicle-mounted remote screens also comprises a display screen circuit; the display screen circuit comprises a deserializer and a display screen; the deserializer and the serializer are connected to receive the high-speed differential signal; and the deserializer analyzes the high-speed differential signal and then sends the analyzed high-speed differential signal to the display screen.

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

Preferably, the vehicle-mounted central control display screen further comprises: a first HSD communication interface or a second HSD communication interface connected to said third HSD communication interface;

when the resolution of the display screen is a first resolution, a third terminal of the third HSD communication interface is connected with a third terminal of the first HSD communication interface, a fourth terminal of the third HSD communication interface is connected with a fourth terminal of the first HSD communication interface, a fifth terminal of the third HSD communication interface is connected with a sixth terminal of the first HSD communication interface, and a sixth terminal of the third HSD communication interface is connected with a fifth terminal of the first HSD communication interface; a third terminal and a fourth terminal of the first HSD communication interface are connected with two input ends of the deserializer through a first high-speed common mode choke coil, and a fifth terminal and a sixth terminal of the first HSD communication interface are connected with the other two input ends of the deserializer through a second high-speed common mode choke coil; the deserializer outputs two paths of LVDS signals to the display screen;

when the resolution of the display screen is a second resolution, a third terminal of the third HSD communication interface is connected with a fifth terminal of the second HSD communication interface, a fourth terminal of the third HSD communication interface is connected with a sixth terminal of the second HSD communication interface, a fifth terminal of the third HSD communication interface is connected with a third terminal of the second HSD communication interface, and a sixth terminal of the third HSD communication interface is connected with a fourth terminal of the second HSD communication interface; a third terminal and a fourth terminal of the second HSD communication interface are both grounded, and a fifth terminal and a sixth terminal of the second HSD communication interface are connected with two input ends of the deserializer through a ninth high-speed common mode choke coil; and the deserializer outputs one path of LVDS signals to the display screen.

Preferably, the display screen circuit further includes: a second power supply module; the second power supply module is connected with the deserializer and the display screen to supply power.

Compared with the prior art, the invention has the following beneficial effects:

according to the circuit adaptive to different vehicle-mounted remote screens and the vehicle-mounted central control display screen, the host controller can be automatically adaptive to two vehicle-mounted display screens with different resolutions (720P and 1080P), and the personalized customization requirements of customers are met; in the process of installing and adapting two different display screens in a car factory, a host controller does not need to be replaced, a wiring harness does not need to be replaced, software is not needed to be upgraded into different versions, and only the display screens need to be directly replaced; the method has the advantages of high recognition rate, strong automatic adaptability and the like.

The above description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the description of the technical means more comprehensible.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

FIG. 1 is a circuit diagram of an embodiment of the present invention;

FIG. 2 is a flow chart of the detection according to the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, in one aspect, the present invention provides a circuit for adapting to different vehicular remote screens, including: the device comprises a host controller U1, a serializer U2 and a voltage acquisition module; the voltage acquisition module comprises a single-pole double-throw switch K1; a moving end A1 of the single-pole double-throw switch K1 is connected with an A/D1 port of the host controller U1, a first fixed end B1 of the single-pole double-throw switch K1 is connected with a first direct-current power supply VCC3V3, a second fixed end C1 of the single-pole double-throw switch K1 is connected with a display screen circuit, a control end S1 of the single-pole double-throw switch K1 is connected with an I/O port of the host controller U1, and the host controller U1 collects the voltage of the A/D1 port; when the movable end A1 of the single-pole double-throw switch K1 is connected with the first fixed end B1, the host controller U1 takes the collected voltage as a reference voltage; when the movable end A1 of the single-pole double-throw switch K1 is connected with the second fixed end C1, the host controller U1 takes the collected voltage as a feedback voltage; the host controller U1 compares the feedback voltage with the reference voltage to judge the resolution of the display screen; the host controller U1 is connected with the serializer U2 to send corresponding EDID data and driving data according to the resolution; the serializer U2 converts the EDID data and the driving data into a high-speed differential signal and sends it to the display screen circuit.

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 with the A/D port of the host controller U1; the other end of the eighth resistor R8 is connected with the movable end A1 of the single-pole double-throw switch K1; a second fixed end C1 of the single-pole double-throw switch K1 is connected with one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected with one end of the ninth resistor R9 and the display screen circuit respectively; the other end of the ninth resistor R9 is connected with a second direct current power supply VCC; the other end of the first resistor R1 is grounded.

Specifically, host controller U1 is inside including CPU, DDR3, EMMC and PMIC etc, host controller U1 has audio and video codec function, including double-circuit LVDS interface, HDMI interface and MIPI interface to and including combinatorial circuit such as WIFI, bluetooth, GPS, in the operation under the android platform in reality, I/O1 is CPU's inside GPIO mouth delivery outlet, AD 1 is CPU's inside AD gathers the mouth for gather the voltage value of A point, the value is VA.

The serializer U2 is an FPD-Link serializer U2 (such as TI's DS90UB949Q-Q1), the host controller U1 and serializer U2 communicate I2C and HMDI signals internally. When power-on initialization is carried out, the host controller U1 initializes the serializer U2 through an I2C configuration related register, after power-on, the host controller U1 carries out data processing according to voltage values acquired by the A/D1 to judge the resolution of a display screen, calls preset related EDID (extended display identification data, which provides almost all display parameters and is composed of 128 bytes) data, and finally converts HMDI information into serial data through the serializer U2 to be sent to the corresponding display screen for display. And if the resolution of the display screen is judged to be 720P, the EDID data corresponding to the 720P display is sent to the serializer U2, and if the resolution of the display screen is judged to be 1080P, the EDID data corresponding to the 1080P display is sent to the serializer U2.

In a default state, the control terminal S1 is 0, and the movable terminal A1 of the single-pole double-throw switch K1 is connected with 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 stationary terminal C1. In practical application, the single-pole double-throw switch K1 can be implemented by a MOS transistor or a relay.

The comparing, by the host controller U1, the feedback voltage with the reference voltage to determine a resolution of the display screen specifically includes:

let the voltage at point a take VA, the voltage at point B take VB equal to VCC3V3, and the voltage at point C take VC. When the single-pole double-throw switch K1 is in a 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) -VCC 3V 3-R1/(R1 + R8) is stored as a reference voltage in the CPU internal memory. When the single-pole double-throw switch K1 is in a switching state (a1 and C1 are connected), the VA value collected by the host controller U1 at point a is VAC, and when the resolutions of the display screens are different, the voltage value of VAC is the case of VAC VCC R1/(R1+ R8+ R5+ R9) or VAC 0, and the host controller U1 can determine which resolution is connected to the current host controller U1 by comparing VAC with VAB. For example, when VAC ═ VC × R1/(R1+ R8+ R5) ═ VCC × R1/(R1+ R8+ R5+ R9), and the reference voltage are subtracted, denoted by VX, VX ═ VAC-VAB, where VX >0 (because VCC is generally 12V or 24V in practical use, and VCC3V3 is 3.3V, reached by adjusting fifth resistor R5 and ninth resistor R9), therefore, if VX, which is the difference between the feedback voltage and the reference voltage, is greater than 0, the resolution of the connected display panel is 1080P; and when VAC is 0, subtracting the feedback voltage from the reference voltage, wherein VX is 0-VAB, and VX is less than 0, so that if the difference VX between the feedback voltage and the reference voltage is less than 0, the connected display screen has the resolution of 720P.

Referring to fig. 2, the steps of detecting and comparing the host controller U1 are as follows:

the equipment is electrified and initialized, the host controller U1 pulls down the I/O1, and the A/D1 collects the current voltage value VAB and stores the current voltage value VAB in the internal memory;

the host controller U1 pulls up the I/O1, the A/D1 collects the current voltage value VAC, the host controller U1 performs internal calculation, VX is VAC-VAB, meanwhile, the host controller U1 performs internal judgment, when VX is greater than 0, the host controller U1 is connected with a U5 display screen (1920 x 1080), and then related EDID data and related driving of U5 are called, so that initialization of the U5 is realized, and normal display is realized; when VX <0, the host controller U1 is connected with the U8 display screen (1280 × 720), and then the related EDID data and the related driver of the U8 are called to initialize the U8 and realize normal display. The purpose of collecting and assigning values twice by adopting electrification and calculating and judging the difference value is to improve the accuracy of software judgment, and the software does not need to set an error range to increase an algorithm; the fluctuation of the power supply may occur each time the device is powered on, which may cause a difference in voltage value acquired each time, and the difference in voltage value may cause a software misjudgment, or the value is not within a set error range, thereby causing a problem that the related driving cannot be normally called and executed.

Further, the voltage acquisition module further comprises: a voltage regulator tube D1; the anode of the voltage-regulator tube D1 is connected with the other end of the first resistor R1, and the cathode of the voltage-regulator tube D1 is connected with the A/D port.

In this embodiment, the voltage regulation value of the voltage regulator tube D1 can be 3.3V, and the voltage regulator tube D1 ensures that the voltage at the point a does not exceed the highest power supply voltage of the host controller U1.

Further, the voltage acquisition module further comprises: a seventh resistor R7; one end of the seventh resistor R7 is connected with the I/O port, and the other end of the seventh resistor R7 is grounded.

The seventh resistor R7 is a pull-down resistor, so that the I/O1 port of the host controller U1 is ensured to be low at the moment of power-on.

Further, the first dc power VCC3V3 is smaller than the second dc power VCC. In this embodiment, the first dc power VCC3V3 may be 3.3V, and the second dc power VCC may be 12V or 24V.

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

Further, the circuit further comprises: 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 magnetic beads with different impedances; the inductance of the fifth inductor L5 is far greater than that of the sixth inductor L6; the second resistor R2 and the third resistor R3 are inductor parallel resistors and are used for adjusting the Q value of the inductor, and inductors with different inductance values and Q values are selected according to requirements in actual application. 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 are used to prevent the power supply from affecting the high-speed signals, so that the high-speed signals are not affected when transmitted on the differential lines, and these constitute a high-impedance path for high frequencies and are not affected for the direct-current power supply.

Further, the circuit further comprises: a third high-speed common mode choke L3 and a fourth high-speed common mode choke L4, the third high-speed common mode choke L3 and the fourth high-speed common mode choke L4 are used for filtering out common mode interference.

Further, the circuit further comprises: 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 and have a direct current blocking function; the ninth capacitor C9, the twelfth capacitor C12, the thirteenth capacitor C13, the fourteenth capacitor C14 and the fifteenth capacitor C15 are filter capacitors, wherein the thirteenth capacitor C13, the fourteenth capacitor C14 and the fifteenth capacitor C15 are selected according to a certain multiple in order to improve the filter bandwidth.

Referring to fig. 1, in another aspect, the invention provides an on-vehicle center control display screen, including: the circuit adapted to different vehicle-mounted remote screens also comprises a display screen circuit; the display screen circuit comprises a deserializer and a display screen; the deserializer and the serializer U2 are connected to receive the high-speed differential signal; and the deserializer analyzes the high-speed differential signal and then sends the analyzed high-speed differential signal to the display screen.

Further, the on-vehicle well accuse display screen still includes: a third HSD communication interface J3 connected to said deserializer; two output ends of the serializer U2 are connected to the third terminal J3_3 and the fourth terminal J3_4 of the third HSD communication interface J3 through a third high-speed common mode choke L3; the other two output ends of the serializer U2 are connected to the fifth terminal J3_5 and the 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 with the fifth terminal J3_5 or the sixth terminal J3_6 of the third HSD communication interface J3.

Further, the on-vehicle well accuse display screen still includes: a first HSD communication interface J1 or a second HSD communication interface J2 connected to said third HSD communication interface J3;

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

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; a third terminal J2_3 and a fourth terminal J2_4 of the second HSD communication interface J2 are both grounded, and a fifth terminal J2_5 and a sixth terminal J2_6 of the second HSD communication interface J2 are connected to two input terminals of the deserializer U7 through a ninth high-speed common mode choke coil L9; the deserializer U7 outputs one LVDS signal to the display screen U8.

In fig. 1, the connection of the circuit for adapting different vehicle-mounted remote screens and two display screen circuits is shown, wherein the first display screen circuit comprises a 1080P display screen U5, and the second display screen circuit comprises a 720P display screen U8. In practical application, only the first display screen circuit or the second display screen circuit is connected.

In this embodiment, U4 is an FPD-Link deserializer (e.g., DS90UB948Q-Q1 of TI); the U5 is a liquid crystal display screen with a capacitive screen and a resolution of 1920 x 1080, and the dual-channel LVDS signals analyzed from the U4 are input to the U5 to be displayed, so that man-machine interaction is realized.

U7 is FPD-Link deserializer (such as DS90UB928Q-Q1 of TI); u8 is the liquid crystal display that has the capacitive screen, and resolution ratio is 1280 720, and the LVDS signal of the same way that analyzes from U7 is input and is shown on U8, realizes human-computer interaction.

The third HSD communication interface J3 is a 4+2 HSD connector such as (TE: 2315834); wherein: j3_1 is connected with GND, J3_2 is connected with a second direct current power supply VCCVCC; j3_3 is DOUT1_ P, J3_4 is DOUT1_ N, and is one set of high-speed differential signal outputs of the serializer U2; j3_5 is DOUT2_ P, J3_6 is DOUT2_ N; 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 groups of differential outputs (DOUT1_ P, DOUT1_ N; DOUT2_ P, DOUT2_ N) are needed to achieve sufficient data bandwidth; when the host controller U1 is equipped with a 720P display screen, only one set of differential outputs (DOUT1_ P, DOUT1_ N by default) need be employed.

The first HSD communication interface J1 is a 4+2 HSD connector such as (TE:2315239), wherein: j1_1 is connected with GND, J1_2 is connected with a second direct current power supply VCCVCC; j1_3 is RIN1_ P, J1_4 is RIN1_ N, and is one of the high-speed differential signal inputs of U4; j1_5 is RIN2_ P, J1_6 is RIN2_ N; is another set of high speed differential signal inputs to U4.

If the display screen adapted by the host controller U1 is U5, J3_1, J3_2, J3_3, J3_4, J3_5 and J3_6 are respectively connected with J1_1, J1_2, J1_3, J1_4, J1_5 and J1_ 6; the high-speed differential line groups are connected by differential lines with the impedance of 100 ohms respectively.

The second HSD communication interface J2 is a 4+2 HSD connector such as (TE:2315239), wherein: j2_1 is connected with GND, J2_2 is connected with a second direct current power supply VCCVCC; j2_5 is RIN3_ P, J2_6 is RIN3_ N, and is a set of high-speed differential signal inputs of U7; j2_3 is grounded through a fourth resistor R4, and J2_4 is grounded through a sixth resistor R6.

If the display screen adapted by the host controller U1 is U8, J3_1, J3_2, J3_3, J3_4, J3_5 and J3_6 are respectively connected with J2_1, J2_2, J2_5, J2_6, J2_3 and J2_ 4; the high-speed differential line groups are connected by differential lines with the impedance of 100 ohms respectively.

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 for filtering 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 function.

The display screen circuit further includes: a second power supply module; the second power supply module is connected with the deserializer and the display screen to supply power. Specifically, a second power supply module U6 is connected to the deserializer U4 and the display screen U5 for supplying power; the second power supply module U9 is connected with the deserializer U7 and the display screen U8 for supplying power.

The invention utilizes the frequency characteristic and the Q value characteristic of the inductor, so that the adaptive circuit can not influence high-speed transmission signals in the high-speed transmission process; meanwhile, an A/D acquisition technology, an I/O port control technology and a transparent transmission control technology (related internal registers are configured, data transparent transmission between the serializer and the deserializer can be realized) by utilizing an FPD-Link serializer U2/deserializer are adopted, and different display screens with different resolutions are utilized, so that the quantity of data required to be transmitted is different in the high-speed serial data transmission process, and the used difference logarithm quantity is different. When the host controller U1 is connected to the display screen U5(1920 × 1080), two sets of differential signal pairs (e.g., DOUT1_ P, DOUT1_ N, DOUT2_ P, DOUT2_ N) must be used for transmission in order to achieve sufficient data bandwidth; when the host controller U1 is equipped with a U8 display screen (1280 × 720), the requirement of data bandwidth can be satisfied by only using one set of differential signal pairs (e.g., DOUT1_ P, DOUT1_ N), and at this time, the other set of unused differential pairs (DOUT2_ P, DOUT2_ N) is grounded to achieve the difference in hardware connection between the two types of display screens; finally, through the difference, the current connected display screen is U5 or U8 through the related control circuit and A/D acquisition, and the acquired data are processed, so that the difference is detected and judged by a CPU of the host controller U1, the current connected display screen is identified to be U5 or U8, and finally, after the CPU determines the display screen with the resolution, the corresponding EDID data pre-stored in the CPU is called to realize the normal display adaptation of the current display screen, and further, the automatic adaptation of the host controller U1 to the remote screens with two different resolutions is realized.

The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.

Claims (10)

1. A circuit for adapting different on-board remote screens, comprising: the device comprises a host controller, a serializer and a voltage acquisition module; the voltage acquisition module comprises a single-pole double-throw switch; the movable end of the single-pole double-throw switch is connected with an A/D port of the host controller, the first immovable end of the single-pole double-throw switch is connected with a first direct-current power supply, the second immovable end of the single-pole double-throw switch is connected with a display screen circuit, the control end of the single-pole double-throw switch is connected with an I/O port of the host controller, and the host controller collects the voltage of the A/D port; when the movable end of the single-pole double-throw switch is connected with the first fixed end, the host controller takes the collected voltage as a reference voltage; when the movable end of the single-pole double-throw switch is connected with the second fixed end, the host controller takes the collected voltage as a feedback voltage; the host controller compares the feedback voltage with the reference voltage to judge the resolution of the display screen; the host controller is connected with the serializer to send corresponding EDID data according to the resolution; and the serializer converts the EDID data into a high-speed differential signal and sends the high-speed differential signal to the display screen circuit.

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

3. The circuit for adapting to different vehicle-mounted remote screens according to claim 2, wherein the voltage acquisition module further comprises: a voltage regulator tube; the anode of the voltage-stabilizing tube is connected with the other end of the first resistor, and the cathode of the voltage-stabilizing tube is connected with the A/D port.

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

5. The circuit for adapting different vehicular remote screens of claim 2, wherein the first dc power supply is smaller than the second dc power supply.

6. The circuit for adapting to different vehicular remote screens of claim 1, further comprising: a first power supply module; the enabling end of the first power supply module is connected with an I/O port of the host controller; the output end of the first power supply module is connected with the display screen circuit to supply power.

7. The utility model provides a accuse display screen in on-vehicle which characterized in that includes: the circuit for adapting to different vehicular remote screens of any one of claims 1 to 6, further comprising a display screen circuit; the display screen circuit comprises a deserializer and a display screen; the deserializer and the serializer are connected to receive the high-speed differential signal; and the deserializer analyzes the high-speed differential signal and then sends the analyzed high-speed differential signal to the display screen.

8. The on-board center control display screen of claim 7, further comprising: a third HSD communications interface connected to said deserializer; two output ends of the serializer are connected with a third terminal and a fourth terminal of the third HSD communication interface through a third high-speed common mode choke coil; the other two output ends of the serializer are connected with a fifth terminal and a sixth terminal of the third HSD communication interface through a fourth high-speed common mode choke coil; the voltage acquisition module is connected with a fifth terminal or a sixth terminal of the third HSD communication interface.

9. The on-board center control display screen of claim 8, further comprising: a first HSD communication interface or a second HSD communication interface connected to said third HSD communication interface;

when the resolution of the display screen is a first resolution, a third terminal of the third HSD communication interface is connected with a third terminal of the first HSD communication interface, a fourth terminal of the third HSD communication interface is connected with a fourth terminal of the first HSD communication interface, a fifth terminal of the third HSD communication interface is connected with a sixth terminal of the first HSD communication interface, and a sixth terminal of the third HSD communication interface is connected with a fifth terminal of the first HSD communication interface; a third terminal and a fourth terminal of the first HSD communication interface are connected with two input ends of the deserializer through a first high-speed common mode choke coil, and a fifth terminal and a sixth terminal of the first HSD communication interface are connected with the other two input ends of the deserializer through a second high-speed common mode choke coil; the deserializer outputs two paths of LVDS signals to the display screen;

when the resolution of the display screen is a second resolution, a third terminal of the third HSD communication interface is connected with a fifth terminal of the second HSD communication interface, a fourth terminal of the third HSD communication interface is connected with a sixth terminal of the second HSD communication interface, a fifth terminal of the third HSD communication interface is connected with a third terminal of the second HSD communication interface, and a sixth terminal of the third HSD communication interface is connected with a fourth terminal of the second HSD communication interface; a third terminal and a fourth terminal of the second HSD communication interface are both grounded, and a fifth terminal and a sixth terminal of the second HSD communication interface are connected with two input ends of the deserializer through a ninth high-speed common mode choke coil; and the deserializer outputs one path of LVDS signals to the display screen.

10. The in-vehicle center control display screen of claim 7, wherein the display screen circuit further comprises: a second power supply module; the second power supply module is connected with the deserializer and the display screen to supply power.

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