CN115946623B

CN115946623B - Instrument display device convenient to installation and working circuit thereof

Info

Publication number: CN115946623B
Application number: CN202211578065.5A
Authority: CN
Inventors: 夏生福
Original assignee: Chongqing Delco Electronic Instrument Co ltd
Current assignee: Chongqing Delco Electronic Instrument Co ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2024-04-09
Anticipated expiration: 2042-12-09
Also published as: CN115946623A

Abstract

The invention discloses an instrument display device convenient to install and a working circuit thereof, which comprise a glass cover plate, a liquid crystal screen, a bracket, a PCB (printed circuit board) and a rear shell, wherein L-shaped clips are arranged at left and right intervals at the top of the bracket, the L-shaped clips are positioned above the rear shell, mounting lugs are arranged at left and right intervals at the bottom of the bracket, mounting holes are formed in the mounting lugs and are matched with mounting bolts to be mounted on an automobile body, the mounting lugs are positioned below the rear shell, and the bottom ends of the mounting lugs extend obliquely backwards; the front side of support is concave to be equipped with the glass mounting groove that is used for installing glass apron, and the tank bottom of glass mounting groove is concave to be equipped with the screen mounting groove that is used for installing liquid crystal display to seal the notch of screen mounting groove through glass apron, be equipped with the leaded light hole on the position that the support corresponds glass mounting groove, be equipped with the leaded light post in the leaded light hole, the rear of leaded light post is stretched to one side of PCB board, and is equipped with light sensor U13, carries out the leaded light for light sensor U13 through the leaded light post. The installation is quick, convenient, stable and reliable.

Description

Instrument display device convenient to installation and working circuit thereof

Technical Field

The invention relates to the technical field of automobile instruments, in particular to an instrument display device convenient to install and a working circuit thereof.

Background

The automobile instrument display device is a device for reflecting the working conditions of various systems of the vehicle; the common indication contents such as fuel oil indicator lamp, cleaning liquid indicator lamp, electronic throttle indicator lamp, front and rear fog lamp indicator lamp and alarm lamp. Common motormeters are all provided with a mounting structure for being assembled on a car body on the back surface of a rear shell, or are mounted in a mode of being clamped by a buckle or a bolt. Because its mounting structure is located the back of backshell, is blocked by the backshell, has sight blind area, installs inconveniently, especially adopts the backshell of bolt installation, often needs to install the backshell on the automobile body alone earlier, installs other parts of instrument display device in the backshell afterwards. There is thus an urgent need for an instrument display device that is convenient to install.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art, and particularly creatively provides an instrument display device convenient to install and a working circuit thereof, and the instrument display device is convenient to install and stable in structure.

In order to achieve the above purpose, the invention provides an instrument display device convenient to install, which comprises a glass cover plate, a liquid crystal screen, a bracket, a PCB and a rear shell which are sequentially arranged from front to back, wherein the top of the bracket is provided with two L-shaped clips which are used for being clamped on an automobile body at intervals left and right, the L-shaped clips are positioned above the rear shell, the bottom of the bracket is provided with a plurality of installation lugs which are used for being installed on the automobile body at intervals left and right, the installation lugs are provided with installation holes and are installed on the automobile body in cooperation with installation bolts, the installation lugs are positioned below the rear shell, and the bottom ends of the installation lugs extend obliquely backwards;

The front side of the bracket is concavely provided with a glass mounting groove for mounting a glass cover plate, the bottom of the glass mounting groove is concavely provided with a screen mounting groove for mounting a liquid crystal screen, the notch of the screen mounting groove is sealed through the glass cover plate, and the screen mounting groove is internally provided with a separation frame for supporting the back surface of the liquid crystal screen, so that the liquid crystal screen is separated from the bottom of the screen mounting groove;

the position of the support corresponding to the glass mounting groove is provided with a light guide hole, a light guide column is arranged in the light guide hole, one side of the PCB extends to the rear of the light guide column, a light sensor U13 for sensing external light of the instrument is arranged, light is guided by the light guide column for the light sensor U13, a plurality of first positioning clamping columns for mounting and positioning the rear shell are arranged on the rear side of the support along the circumferential direction of the support, a first yielding gap is arranged on the PCB corresponding to the first positioning clamping columns, a second positioning clamping column is arranged on the rear shell corresponding to the first positioning columns, and a clamping hole for clamping in the second positioning clamping columns and extending forwards and backwards is arranged on the first positioning clamping columns; the second positioning clamping column is clamped on the first positioning clamping column.

In the scheme, the method comprises the following steps: the partition frame comprises vertical lapping rods arranged at left and right intervals and a cross rod used for connecting all vertical lapping rods together, wherein the upper end and the lower end of each lapping rod are respectively installed on the inner side wall of a screen installation groove, the left end and the right end of each cross rod are also installed on the inner side wall of the screen installation groove, the front sides of all lapping rods are respectively provided with a clamping groove used for clamping the cross rod, the cross rods are flush with the front sides of the lapping rods, positioning rods which extend vertically are further integrally formed on the cross rods, the cross rods are distributed in a cross shape with the positioning rods, and the front side of any lapping rod is provided with a positioning groove used for clamping the positioning rods.

In the scheme, the method comprises the following steps: the first positioning clamping column and the second positioning clamping column are both in a shape of a cross, openings of the two shapes of the cross are arranged oppositely during clamping, and a space enclosed by the shapes of the cross is a clamping hole.

In the scheme, the method comprises the following steps: the three first positioning clamping columns are arranged on the left side, the right side and the top of the support respectively, the first positioning clamping columns close to the light guide columns are arranged in the middle of the PCB, and the other two first positioning clamping columns are arranged on the edge of the PCB.

In the scheme, the method comprises the following steps: the installation lugs are three which are arranged from left to right, the centrally arranged installation lugs are lower than the left and right installation lugs, the installation lugs on the left and right sides are symmetrically arranged along the vertical central line of the instrument, the bottom of the rear shell is provided with a second yielding gap for yielding the left and right installation lugs,

the invention also provides a working circuit of the instrument display device, which comprises the instrument display device with the scheme, and further comprises an MCU, wherein the input end of the MCU wake-up signal is connected with one end of the wake-up circuit, the other end of the wake-up circuit is connected with a wiring row P1, and the other end of the wake-up circuit is connected with the wake-up signal output end of the automobile host through the wiring row P1; the MCU light detection signal input end is connected with the detection signal output end of the light sensor U13, the MCUTFT backlight adjustment signal output end is connected with the backlight signal input end of the LED driver U6, and the adjustment output end of the LED driver U6 is connected with the adjustment signal input end of the connector FPC 2;

The image signal transmission circuit comprises a deserializer U5, wherein the image signal input end of the deserializer U5 is connected with a second wiring row J1, the second wiring row J1 is used for being connected with an image signal output end of an automobile host, the image signal output end of the deserializer U5 is connected with an image signal input end of an OSD chip U10, and the image signal output end of the OSD chip U10 is connected with an image signal input end of a connector FPC 1;

the power supply circuit is characterized by further comprising a power supply circuit, wherein one power input end of the power supply circuit is connected with a wiring row P1, an external power supply is connected through the wiring row P1, a first power supply end of the power supply circuit is connected with a voltage input end of a fourth voltage reduction circuit, a second power supply end of the power supply circuit is connected with a voltage input end of the first voltage reduction circuit, and a voltage output end of the first voltage reduction circuit is connected with a voltage input end of the second voltage reduction circuit and a voltage input end of the third voltage reduction circuit.

In the scheme, the method comprises the following steps: the power supply circuit comprises a first wiring row P1, wherein the first end of the first wiring row P1 is connected with one end of a transient suppression diode TVS1, one end of a capacitor C2, the positive electrode of a diode D2 and the positive electrode of the diode D1, the first end of the first wiring row P1 is used for being connected with an external power supply, the other end of the capacitor C2 is connected with a power supply ground, the other end of the transient suppression diode TVS1 is connected with a first wiring row P1 second end, the second end of the first wiring row P1 is used for being connected with the power supply ground, the negative electrode of the diode D2 is connected with the negative electrode of the diode D1, one end of a capacitor C4, one end of a capacitor C3 and one end of an inductor L1, and the other end of the capacitor C4 and the other end of the capacitor C3 are all connected with the power supply ground; one end of the inductor L1 is a power supply first power supply end, the other end of the inductor L1 is a power supply second power supply end, the other end of the inductor L1 is connected with one end of the capacitor C13 and the anode of the diode D11, the other end of the capacitor C13 is connected with the power supply ground, the cathode of the diode D11 is connected with the voltage input end of the voltage stabilizer U1, one end of the capacitor C4, one end of the capacitor C10 and one end of the resistor R4, the other end of the capacitor C4 and the other end of the capacitor C10 are connected with the power supply ground, the other end of the resistor R4 is connected with the enabling end of the voltage stabilizer U1, the voltage output end of the voltage stabilizer U1 outputs 3.3V voltage to supply power for the MCU, the voltage output end of the voltage stabilizer U1 is connected with one end of the capacitor C11 and one end of the capacitor C27, and the other end of the capacitor C11 and the other end of the capacitor C27 are connected with the power supply ground; the reset end of the voltage stabilizer U1 is connected with one end of a resistor R15, the fault end of the voltage stabilizer U1 is connected with one end of a resistor R16, and the other end of the resistor R15 and the other end of the resistor R16 are both connected with the MCU reset signal input end; the reset delay end of the voltage stabilizer U1 is connected with one end of a capacitor C12, the other end of the capacitor C12 is connected with power ground, the ROSC end of the voltage stabilizer U1 is connected with one end of a resistor R12, and the other end of the resistor R12 is connected with power ground;

The negative electrode of the diode D1 is connected with one end of a resistor R126, the other end of the resistor R126 is connected with one end of a resistor R1 and one end of a resistor R144, the other end of the resistor R1 is connected with one end of a resistor R2 and the first end of MCU power supply sampling, the other end of the resistor R2 is connected with one end of a capacitor C1 and power supply ground, and the other end of the capacitor C1 is connected with the other end of the resistor R1; the other end of the resistor R144 is connected with one end of the resistor R143, and the other end of the resistor R143 is connected with one end of the resistor R145 and the MCU power supply sampling second end; the other end of the resistor R145 is connected with one end of the capacitor C150 and the power ground, and the other end of the capacitor C150 is connected with one end of the resistor R145;

the first voltage reduction circuit comprises a voltage reduction DC-DC converter enabling signal input end, a resistor R26 end and a resistor R28 end, wherein the other end of the resistor R28 is connected with power ground, the other end of the resistor R26 is connected with an MCU working voltage power supply enabling output end, the voltage input end of the voltage reduction DC-DC converter is connected with a power supply second power supply end, a capacitor C28 end, a capacitor C29 end and a capacitor C30 end, and the other end of the capacitor C28, the other end of the capacitor C29 and the other end of the capacitor C30 are all connected with power ground; the BOOT end of the buck DC-DC converter is connected with one end of a resistor R25, the other end of the resistor R25 is connected with one end of a capacitor C25, the other end of the capacitor C25 is connected with one end of a resistor R24, the other end of the resistor R24 is connected with one end of a capacitor C26, and the other end of the capacitor C26 is connected with power ground; the output end of the step-down DC-DC converter is connected with one end of an inductor L3, the cathode of a diode D7 and one end of a resistor R24, the other end of the inductor L3 outputs 3.3V power supply voltage for supplying power to the deserializer U5, the MSPI communication interface U11, the LCD power supply chip U7 and the optical sensor U13, the other end of the inductor L3 is connected with one end of a capacitor C32, one end of a capacitor C33, one end of a capacitor C34 and one end of a capacitor C31, the other end of the capacitor C32, the other end of the capacitor C33, the other end of the capacitor C34, the other end of the capacitor C31 and the anode of the diode D7 are connected with power ground;

The other end of the inductor L3 is connected with one end of a resistor R77, the other end of the resistor R77 is connected with the input end of the MCU first voltage reduction sampling signal, one end of a resistor R78 and one end of a capacitor C114, and the other ends of the resistor R78 and the capacitor C114 are connected with power ground;

the other end of the inductor L3 is connected with one end of the filter L17, and the other end of the filter L17 outputs 3.3V voltage for supplying power to the OSD chip U10;

the inverting input of the step-down DC-DC converter is connected with one end of a resistor RFBB1 and one end of a resistor RFBT1, the other end of the resistor RFBB1 is connected with the power ground, the other end of the resistor RFBT1 is connected with one end of a resistor RFBT2, and the other end of the resistor RFBT2 is connected with the other end of a inductor L3;

the oscillating end of the buck DC-DC converter is connected with one end of a resistor R29, the other end of the resistor R29 is connected with the power ground, the starting time end of the buck DC-DC converter is connected with one end of a resistor R27 and one end of a capacitor C36, the other end of the resistor R27 is connected with one end of a capacitor C35, and the other end of the capacitor C35 and the other end of the capacitor C36 are connected with the power ground;

the second voltage reduction circuit comprises a voltage stabilizer U4, a resistor R30 and a capacitor C37, wherein the voltage input end of the voltage stabilizer U4 is connected with the other end of an inductor L3, one end of a resistor R30 and one end of a capacitor C37, the other end of the resistor R30 is connected with an enabling signal input end of the voltage stabilizer U4 and one end of a resistor R32, the other end of the capacitor C37 and the other end of the resistor R32 are both connected with power ground, the voltage output end of the voltage stabilizer U4 outputs 1.2V working voltage for supplying power to the deserializer, one end of a resistor RFBT3, the normal start end of the voltage stabilizer U4, one end of a resistor C38, one end of a resistor R31 and one end of a resistor R79 are connected, the other end of the resistor RFBT3 is connected with the feedback voltage input end of the voltage stabilizer U4 and one end of a resistor RFBB2, the other end of the resistor C38 and the other end of the resistor R31 are both connected with the power ground, the other end of the resistor R79 is connected with the MCU second voltage reduction sampling signal input end, one end of a resistor R167 and one end of the resistor C115, and the other end of the resistor C115 are both connected with power ground;

The third voltage reduction circuit comprises a voltage stabilizer U12, wherein the voltage input end of the voltage stabilizer U12 is connected with the other end of an inductor L3, one end of a resistor R89 and one end of a capacitor C127, the other end of the resistor R89 is connected with an enabling signal input end of the voltage stabilizer U12 and one end of a resistor R91, the other end of the capacitor C127 and the other end of the resistor R91 are both connected with power ground, the voltage output end of the voltage stabilizer U12 outputs 1.5V working voltage for supplying power to the deserializer and is connected with one end of a resistor RFBT6, the normal start end of the voltage stabilizer U12, one end of a capacitor C128 and one end of a resistor R90, the other end of the resistor RFBT6 is connected with the feedback voltage input end of the voltage stabilizer U12 and one end of a resistor RFBB4, and the other end of the resistor RFBB4, the other end of the capacitor C128 and the other end of the resistor R90 are all connected with the power ground;

the voltage output end of the voltage stabilizer U12 is connected with one end of the filter L18, the other end of the filter L18 outputs 1.5V voltage for supplying power to the OSD chip U10, the other end of the filter L18 is connected with one end of the resistor R168, the other end of the resistor R168 is connected with the MCUOSD1.5 power supply sampling signal input end, one end of the resistor R169 and one end of the capacitor C116, and the other ends of the resistor R169 and the capacitor C116 are both connected with power ground;

the fourth step-down circuit comprises a CAN power supply chip U9 voltage input end, a first power supply end and a capacitor C26 end, wherein the capacitor C126 end and a CAN power supply chip U9 grounding end are both connected with power supply ground, the CAN power supply chip U9 voltage output end outputs 5V voltage for supplying power to a CAN transceiver U8, the CAN power supply chip U9 voltage output end is connected with a capacitor C125 end, the other end of the capacitor C125 is connected with power supply ground, a reset output end of the CAN power supply chip U9 is connected with one end of a resistor R53, the other end of the resistor R53 is connected with one end of a resistor R52 and an MCUCAN power supply fault signal input end, and the other end of the resistor R52 is connected with a voltage stabilizer U1 voltage output end; the delay reset end of the CAN power supply chip U9 is connected with one end of the capacitor Css1, and the other end of the capacitor Css1 is connected with power ground.

In the scheme, the method comprises the following steps: the first end of the second wiring bank J1 is connected with the first end of the filter L11 and one end of the ESD inhibitor ESD5, and the other end of the ESD inhibitor ESD5 is connected with the power ground; the third end of the second wiring bank J1 is connected with the second end of the filter L11 and one end of the ESD inhibitor ESD6, and the other end of the ESD inhibitor ESD6 is connected with the power supply ground; the third end of the filter L11 is connected with one end of a capacitor C73, the other end of the capacitor C73 is connected with the second RIN anode end of the deserializer U5, the fourth end of the filter L11 is connected with one end of a capacitor C74, and the other end of the capacitor C74 is connected with the second RIN cathode end of the deserializer U5; the second terminal of the second wiring bank J1 is connected with the first terminal of the filter L10 and one terminal of the ESD inhibitor ESD4, and the other terminal of the ESD inhibitor ESD4 is connected with the power supply ground; the fourth end of the second wiring bank J1 is connected with the second end of the filter L10 and one end of the ESD3, and the other end of the ESD3 is connected with the power supply ground; the third end of the filter L10 is connected with one end of a capacitor C71, the other end of the capacitor C71 is connected with the first RIN anode end of the deserializer U5, the fourth end of the filter L10 is connected with one end of a capacitor C72, and the other end of the capacitor C72 is connected with the first RIN cathode end of the deserializer U5;

the MCULVDS enable signal output end is connected with one end of a resistor R43, the other end of the resistor R43 is connected with one end of a resistor R41, one end of a resistor R42 and the inner working voltage output end of a deserializer U5 are connected with each other, the other end of the resistor R41 is connected with one end of a resistor R39 and the inner working voltage output end of the deserializer U5, the other end of the resistor R39 is connected with one end of a resistor R40 and the inner working voltage output end of the deserializer U5 are connected with each other, and the other ends of the resistor R40 and the resistor R42 are connected with power ground;

The MCULVDS SI2C bus data signal transmission end is connected with one end of a resistor R128, and the other end of the resistor R128 is connected with one end of a resistor R46 and the deserializer U5LVDSI2C bus data signal transmission end; the MCULVDS SI2C bus clock signal transmission end is connected with one end of a resistor R127, and the other end of the resistor R127 is connected with one end of a resistor R45 and the deserializer U5LVDSI2C bus clock signal transmission end; the other end of the resistor R46 and the other end of the resistor R45 are connected with an internal working voltage output end; the output end of the MCULVDS power saving mode is connected with one end of a resistor R48, the other end of the resistor R48 is connected with the positive electrode of a diode D8, one end of a resistor R44 and the input pin of the deserializer U5 power saving mode, and the negative electrode of the diode D8 and the other end of the resistor R44 are connected with the output end of the working voltage in the deserializer U5;

the output end of the MCULVDS backlight enable signal is connected with one end of a resistor R51, and the other end of the resistor R51 is connected with the input end of the deserializer U5LVDS backlight enable signal; the output end of the MCULVDS backlight PWM signal is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with the input end of the deserializer U5LVDS backlight PWM signal; the output end of the MCULVDS backlight PWM signal is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with the input end of the deserializer U5LVDS backlight PWM signal; the first universal signal transmission end of the MCULVDS is connected with one end of a resistor R57, and the other end of the resistor R57 is connected with the first universal signal transmission end of the deserializer U5 LVDS; the second common signal transmission end of the MCULVDS is connected with one end of a resistor R58, and the other end of the resistor R58 is connected with the second common signal transmission end of the deserializer U5 LVDS; the locking state output end of the deserializer U5 is connected with one end of a resistor R49, the other end of the resistor R49 is connected with the locking state input end of the MCULVDS, the deserializer U5 is connected with one end of a resistor R50 through the state output end, and the other end of the resistor R50 is connected with the MCULVDS through the state input end;

The deserializer U5TFTOLV signal transmission line is connected with the first filter bank TFTOLV signal input end, the first filter bank TFTOLV signal output end is connected with the OSD chip U10TFTOLV signal input line, the OSD chip U10TFTOLV signal output line is connected with the connector FPC1TFTOLV signal input line, the deserializer U5TFTELV signal transmission line is connected with the second filter bank TFTELV signal input end, the second filter bank TFTELV signal output end is connected with the OSD chip U10TFTELV signal input line, and the OSD chip U10TFTELV signal output line is connected with the connector FPC1TFTELV signal input line; the input end of a clock signal of the connector FPC1 is connected with one end of a resistor R97, the other end of the resistor R97 is connected with the output end of a MCUTFT clock signal, the output end of a MCUTFT data signal is connected with one end of a resistor R96, the other end of the resistor R96 is connected with the input end of the data signal of the connector FPC1, the output end of an MCUTFT enabling signal is connected with one end of a resistor R99, the other end of the resistor R99 is connected with the input end of the enabling signal of the connector FPC1, the output end of a MCUTFT resetting signal is connected with one end of a resistor R101, the other end of the resistor R101 is connected with the reset signal input end of the connector FPC1, the signal transmission end of a MCUTFT switch is connected with one end of a resistor R106, the other end of the resistor R106 is connected with the switch signal transmission end of the connector FPC1 and one end of a resistor R108, and the other end of the resistor R108 is connected with a power supply ground; the MCUTFT fault signal transmission end is connected with one end of a resistor R111, the other end of the resistor R111 is connected with the fault signal transmission end of the connector FPC1 and one end of a resistor R112, and the other end of the resistor R112 is connected with power ground;

The voltage input end of the LED driver U6 is connected with a second power supply end of a power supply, one end of an inductor L12, one end of a capacitor C84, one end of a capacitor C85 and one end of a capacitor C86, the other end of the capacitor C84, the other end of the capacitor C85 and the other end of the capacitor C86 are connected with power supply ground, the enabling signal input end of the LED driver U6 is connected with one end of a resistor R60, the other end of the resistor R60 is connected with an MCUTFT backlight enabling signal output end, the PWM signal input end of the LED driver U6 is connected with one end of a resistor R64, and the other end of the resistor R64 is connected with the MCUTFT backlight PWM signal output end; the working voltage output end of the LED driver U6 is connected with one end of a resistor R66, one end of a resistor R65 and the cathode of a diode D10, the anode of the diode D10 and one end of the resistor R65 are both connected with one end of a capacitor C92, and the other end of the capacitor C92 is connected with power ground; the other end of the resistor R66 is connected with the fault end of the LED driver U6 and one end of the resistor R70, and the other end of the resistor R70 is connected with the MCUTFT backlight fault signal output end;

the other end of the inductor L12 is connected with the voltage output end of the LED driver U6, the anode of the diode D9 and one end of the resistor R59, the other end of the resistor R59 is connected with one end of the capacitor C83, and the other end of the capacitor C83 is connected with the power ground; the cathode of the diode D9 is a TFT backlight power supply end; the TFT backlight power supply end is connected with one end of an inductor L24, the other end of the inductor L24 is connected with one end of a capacitor C102, one end of a resistor R172 and the voltage input end of a connector FPC2, the other end of the capacitor C102 is connected with power ground, the other end of the resistor R172 is connected with one end of a resistor R173, one end of a capacitor C151 and the MCUTFT backlight power supply sampling signal input end, and the other end of the resistor R173 and the other end of the capacitor C151 are connected with power ground;

The first backlight signal output end of the LED driver U6 is connected with one end of a resistor R105, the other end of the resistor R105 is connected with the first backlight signal input end of a connector FPC2, the second backlight signal output end of the LED driver U6 is connected with one end of a resistor R110, the other end of the resistor R110 is connected with the second backlight signal input end of the connector FPC2, the third backlight signal output end of the LED driver U6 is connected with one end of a resistor R113 and one end of a resistor R174, the other end of the resistor R113 is connected with the third backlight signal input end of the connector FPC2, the other end of the resistor R174 is connected with one end of a resistor R175, one end of a capacitor C152 and the third backlight PWM signal sampling end of the MCU, the fourth backlight signal output end of the LED driver U6 is connected with one end of a resistor R114 and one end of a resistor R176, the other end of the resistor R114 is connected with the fourth backlight signal input end of the connector FPC2, and the other end of the resistor R176 is connected with one end of a resistor R177, one end of a capacitor C153 and the fourth backlight PWM signal sampling end of the MCU; the MCUTFT backlight enabling signal output end is connected with one end of a resistor R107, the other end of the resistor R107 is connected with one end of a resistor R109, one end of a capacitor C105 and the base electrode of a triode Q4, the emitter electrode of the triode Q4, the other end of the resistor R109 and the other end of the capacitor C105 are connected with the power supply ground, the collector electrode of the triode Q4 is connected with one end of a resistor R104, the other end of the resistor R104 is connected with one end of a capacitor C100, one end of a resistor R102 and the base electrode of a triode Q3, the other ends of the resistor R102 are both connected with the voltage output end of a voltage stabilizer U1, the collector electrode of the triode Q3 is connected with the other end of the capacitor C100, one end of the capacitor C101 and one end of the resistor R100, the other end of the capacitor C101 is connected with the power supply ground, one end of the resistor R100 is connected with the input end of the resistor R98 and the TFT backlight enabling signal of a connector, the other end of the resistor R98 is connected with one end of the capacitor C99 and the MCUTNTC sampling end, and the other end is connected with the power supply ground;

The MCUSPI communication starting signal output end is connected with the OSD chip U10SPI communication starting signal input end, the MCUSPI communication signal output end is connected with the OSD chip U10SPI communication signal input end, the MCUSPI communication signal input end is connected with the OSD chip U10SPI communication signal output end, the MCUSPI communication clock signal transmission end is connected with the OSD chip U10SPI communication clock signal transmission end, the MCUOSD reset output end is connected with one end of a resistor R136, the other end of the resistor R136 is connected with one end of a resistor R135, one end of a capacitor C141 and the OSD chip U10 reset signal input end, the other end of the resistor R135 is connected with the other end of an inductor L3, the other end of the capacitor C141 is connected with power ground, the MCUOSD fault signal input end is connected with one end of a resistor R138, the other end of the resistor R138 is connected with one end of a resistor R137 and the OSD chip U10 fault signal input end, and the other end of the resistor R137 is connected with the other end of the inductor L3;

the OSD chip U10MSPI communication clock signal transmission end is connected with one end of a resistor R133, the other end of the resistor R133 is connected with the MSPI communication interface U11 clock signal transmission end, the OSD chip U10MSPI communication starting signal output end is connected with one end of a resistor R132, the other end of the resistor R132 is connected with the MSPI communication interface U11 starting signal output end, the OSD chip U10MSPI communication signal input end is connected with one end of a resistor R131, the other end of the resistor R131 is connected with the MSPI communication interface U11 communication signal output end, the OSD chip U10MSPI communication signal output end is connected with one end of a resistor R134, and the other end of the resistor R134 is connected with the MSPI communication interface U11 communication signal input end; the MSPI communication interface U11 working voltage input end is connected with one end of an inductor L16, one end of a capacitor C129 and one end of a capacitor C130, and the other end of the inductor L16 is connected with the other end of an inductor L3.

In the scheme, the method comprises the following steps: the wake-up circuit comprises a first wiring row P1, wherein a third end of the first wiring row P1 is connected with one end of an ESD inhibitor ESD1B, one end of a capacitor C5 and the positive electrode of a diode D3, the third end of the first wiring row P1 is used for being connected with an automobile ignition signal input end, the other end of the ESD inhibitor ESD1B and one end of the capacitor C5 are both connected with power ground, the negative electrode of the diode D3 is connected with one end of a resistor R80, the other end of the resistor R80 is connected with one end of a resistor R81, one end of the capacitor C117 and the base electrode of a triode Q6, the other end of the resistor R81, the other end of the capacitor C117 and the emitter of the triode Q6 are both connected with power ground, the collector of the triode Q6 is connected with the enabling end of a voltage regulator U1 watchdog and one end of a resistor R17, and the other end of the resistor R17 is connected with power ground; the other end of the voltage input end of the voltage stabilizer U1 is connected with the voltage output end of the voltage stabilizer U1;

the diode D3 negative pole still connects resistance R10 one end, resistance R10 other end connecting resistance R11 one end, electric capacity C9 one end and triode Q2 base, resistance R11 other end, electric capacity C9 other end and triode Q2 projecting pole all connect power ground, triode Q2 collecting electrode connecting resistance R9 one end, the triode Q1 base and resistance R8 one end are connected to the resistance R9 other end, the regulator U1 voltage output end and triode Q1 projecting pole are connected to the resistance R8 other end, triode Q1 collecting electrode connecting resistance R7 one end, electric capacity C8 one end and MCU wake-up signal input, the power ground is all connected to the resistance R7 other end and electric capacity C8 other end.

In the scheme, the method comprises the following steps: the LCD power supply chip U7 voltage input end is connected with the other end of the inductor L3, one end of the capacitor C109 and one end of the capacitor C110, the other end of the capacitor C109, the other end of the capacitor C110 and the grounding end of the LCD power supply chip U7 are connected with the power supply ground, the LCD power supply chip U7 enabling signal input end is connected with one end of the resistor R123 and one end of the resistor R121, the other end of the resistor R121 is connected with the power supply ground, the other end of the resistor R123 is connected with the MCULCD power supply enabling signal output end, the voltage output end of the LCD power supply chip U7 outputs 3.3V voltage for supplying power to the LCD, the voltage output end of the LCD power supply chip U7 is connected with one end of the resistor R22 and one end of the capacitor C111, the other end of the capacitor C111 is connected with the power supply ground, the fault output end of the LCD power supply chip U7 is connected with one end of the resistor R122, one end of the resistor R124 and one end of the capacitor C112, the other end of the resistor R124 is connected with the MCULCD power supply fault signal input end, and the other end of the capacitor C112 is connected with the power supply ground.

In the scheme, the method comprises the following steps: the working voltage input end of the optical sensor U13 is connected with the voltage output end of the voltage stabilizer U1, one end of the capacitor C148 and one end of the capacitor C149, the other end of the capacitor C148 and the other end of the capacitor C149 are connected with power ground, the reference resistance end of the optical sensor U13 is connected with one end of the resistor R141, the other end of the resistor R141 and the grounding end of the optical sensor U13 are both connected with power ground, the signal output end of the optical sensor U13 is connected with one end of the resistor R142 and one end of the resistor R54, the other end of the resistor R142 is connected with the light detection signal input end of the MCU, the clock end of the optical sensor U13 is connected with the light sensing clock signal end of the MCU and one end of the resistor R55, the data end of the optical sensor U13 is connected with one end of the MCU light sensing data signal end of the resistor R146, and one end of the resistor R54, one end of the resistor R55 and the other end of the resistor R146 are all connected with the voltage output end of the voltage stabilizer U1.

In the scheme, the method comprises the following steps: the CAN bus connection circuit comprises a CAN transceiver U8 working voltage input end, a CAN power supply chip U9 voltage output end and a capacitor C120 end, wherein the other end of the capacitor C120 is connected with power ground, the low-level end of the CAN transceiver U8 is connected with a third end of a filter L14 and one end of a resistor R82, the other end of the resistor R82 is connected with the second end of the filter L14, and the other end of the resistor R82 is connected with a seventh end of a first wiring row P1; the high-level end of the CAN transceiver U8 is connected with the fourth end of the filter L14 and one end of a resistor R88, the other end of the resistor R88 is connected with the first end of the filter L14, the other end of the resistor R88 is connected with the sixth end of the first wiring row P1, the seventh end and the sixth end of the first wiring row P1 are connected with an automobile CAN bus, the other end of the R88 is connected with one end of a resistor R86, one end of a capacitor C123 and the first end of an ESD (electro-static discharge) suppressor ESD7, the other end of the resistor R86 is connected with one end of a capacitor C122 and one end of a resistor R84, the other end of the resistor R84 is connected with the other end of the resistor R82, the other end of the resistor R82 is also connected with one end of a capacitor C121, and the other end of the capacitor C121 and the other end of the capacitor C123 of the capacitor C122 are both connected with power ground;

the transmitting end of the CAN transceiver U8 is connected with one end of a resistor R83, the other end of the resistor R83 is connected with the MCUCAN signal transmitting end, the receiving end of the CAN transceiver U8 is connected with one end of a resistor R85, the other end of the resistor R85 is connected with the MCUCAN signal receiving end, the standby end of the CAN transceiver U8 is connected with one end of a resistor R87 and the standby end of the MCUCAN, and the other end of the resistor R87 and the grounding end of the CAN transceiver are both connected with power ground.

In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows: the L-shaped clamp and the mounting lugs are respectively arranged on the upper side and the lower side of the rear shell, can not be blocked by the rear shell, are positioned in advance, are mounted on an automobile body through the mounting lugs by bolts, and are rapid, convenient, stable and reliable to assemble. And L type checkpost and installation journal stirrup all set up on the support, all fix on the support to the most important PCB board of instrument display device and LCD screen, and not fix on the backshell, can improve the connection stability of PCB board and LCD screen and automobile body. The light guide hole and the light guide column that set up can be convenient for the light sensor U13 of PCB board to detect external light source to adjust instrument display device's screen luminance, the function is various.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

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

fig. 2 is a circuit diagram of the connection bar P1 connecting an external power source and a wake-up circuit;

FIG. 3 is a circuit diagram of a power supply circuit;

FIG. 4 is a circuit diagram of the MCU;

fig. 5 is a circuit diagram of a first step-down circuit;

Fig. 6 is a circuit diagram of a second step-down circuit;

FIG. 7 is a circuit diagram of a deserializer;

FIG. 8 is a circuit diagram of an LED driver;

FIG. 9 is a circuit diagram of an LCD power chip;

fig. 10 is a circuit diagram of the connector FPC 1;

fig. 11 is a circuit diagram of the connector FPC 2;

FIG. 12 is a circuit diagram of a CAN transceiver;

FIG. 13 is a circuit diagram of a CAN power chip;

fig. 14 is a circuit diagram of a third step-down circuit;

FIG. 15 is a circuit diagram of a serializer;

FIG. 16 is a circuit diagram of an MSPI communication interface;

FIG. 17 is a circuit diagram of a light sensor;

FIG. 18 is a schematic view of the structure of the meter display device;

FIG. 19 is a schematic view of the structure of the back of the rear housing of the meter display;

FIG. 20 is a schematic view of the structure of a stand and a liquid crystal screen of the meter display device;

FIG. 21 is a schematic view of the structure of the stand and spacer of the meter display device;

FIG. 22 is a schematic view of the structure of the stand and PCB of the meter display device;

fig. 23 is a schematic structural view of the inside of the rear case of the meter display device.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

As shown in fig. 18 to 23, an instrument display device convenient to install includes a glass cover plate 1, a liquid crystal screen 1a, a bracket 4, a PCB board 5 and a rear case 6 which are sequentially disposed from front to back, the glass cover plate 1 and the liquid crystal screen 1a are sequentially mounted on the front side of the bracket 4, and the PCB board 5 and the rear case 6 are sequentially mounted on the rear side of the bracket 4. Wherein, the liquid crystal screen 1a is fixed on the back of the glass cover plate 1 to form a screen assembly. The interval is equipped with two L type checkpost 3 that are used for the card on the automobile body about the top of support 4, and L type checkpost 3 is located the top of backshell 6, and L type checkpost 3 is including the connecting plate that extends from beginning to end, and the front end fixed connection at the back at support 4 top of connecting plate, the vertical fixture block that is equipped with in the bayonet socket that is used for stretching to the automobile body correspondence in the rear end of connecting plate. The interval is equipped with a plurality of installation lugs 2 that are used for installing on the automobile body about the bottom of support 4, be equipped with the mounting hole on the installation lug 2, the cooperation mounting bolt is installed on the automobile body, and installation lug 2 is located the below of backshell 6, and the bottom backward slope of installation lug 2 extends.

The front side of the bracket 4 is concavely provided with a glass mounting groove for mounting the glass cover plate 1, the bottom of the glass mounting groove is concavely provided with a screen mounting groove for mounting the liquid crystal screen 1a, and the notch of the screen mounting groove is sealed through the glass cover plate 1. A spacer for supporting the back surface of the liquid crystal screen 1a is provided in the screen mounting groove so that the liquid crystal screen 1a is spaced from the bottom of the screen mounting groove.

The support 4 is equipped with light guide hole 4e on the position that corresponds the glass mounting groove, is equipped with the leaded light post in the leaded light hole 4e, and the rear of leaded light post is stretched to one side of PCB board 5 to be equipped with the light sensor U13 that is used for the outside light of response instrument, carry out the leaded light for light sensor U13 through the leaded light post. The rear side of the bracket 4 is provided with a plurality of first positioning clamping columns 4d along the circumferential direction thereof for mounting and positioning the rear shell 6, and the PCB 5 is provided with a first yielding gap 5a corresponding to the first positioning clamping columns 4 d. The rear shell 6 is provided with a second positioning clamping column 6a corresponding to the first positioning column, and the first positioning clamping column 4d is provided with a clamping hole which is used for the second positioning clamping column 6a to clamp in and extends forwards and backwards. The second positioning locking column 6a is locked on the first positioning locking column 4 d.

The bracket 4 is provided with a through hole for the connector FPC1 and the connector FPC2 to pass through, the PCB 5 is electrically connected with the screen assembly through the connector FPC1 and the connector FPC2, and the PCB 5 is integrated with a working circuit of the instrument display device.

In the scheme, the method comprises the following steps: the spacer comprises vertical lapping rods 4a arranged at left and right intervals and a cross rod 4b used for connecting all the vertical lapping rods 4a together, the upper end and the lower end of the lapping rods 4a are all installed on the inner side wall of the screen installation groove, the left end and the right end of each cross rod 4b are also installed on the inner side wall of the screen installation groove, the front sides of all the lapping rods 4a are all provided with clamping grooves used for clamping the cross rod 4b, the cross rod 4b is flush with the front sides of the lapping rods 4a, positioning rods 4c which extend vertically are integrally formed on the cross rods 4b, the cross rods 4b and the positioning rods 4c are distributed in a cross shape, and the front side of any one lapping rod 4a is provided with a positioning groove used for clamping the positioning rod 4 c.

In the scheme, the method comprises the following steps: the first positioning clamping column 4d and the second positioning clamping column 6a are both in a shape of a cross, and the two openings of the cross are oppositely arranged during clamping, and a space enclosed by the cross is a clamping hole.

In the scheme, the method comprises the following steps: the first positioning clamping columns 4d are three, are respectively arranged on the left side, the right side and the top of the support 4, the first positioning clamping columns 4d close to the light guide columns are arranged in the middle of the PCB 5, and the other two first positioning clamping columns 4d are arranged on the edge of the PCB 5.

In the scheme, the method comprises the following steps: the mounting lugs 2 are three which are arranged from left to right, the centrally arranged mounting lugs 2 are lower than the left and right mounting lugs 2, the mounting lugs 2 positioned on the left and right are symmetrically arranged along the vertical central line of the instrument, the bottom of the rear shell 6 is provided with a second yielding gap for yielding the left and right mounting lugs 2,

as shown in fig. 1 to 17, the working circuit of the instrument display device comprises an MCUU2, wherein the wake-up signal input end of the MCUU2 is connected with one end of the wake-up circuit, the other end of the wake-up circuit is connected with a wiring row P1, and the wiring row P1 is connected with the wake-up signal output end of the automobile host; the MCUU2 light detection signal input end is connected with the light sensor U13 detection signal output end, the MCUU2TFT backlight adjustment signal output end is connected with the LED driver U6 backlight signal input end, and the LED driver U6 adjustment output end is connected with the connector FPC2 adjustment signal input end;

The image signal transmission circuit comprises a deserializer U5, wherein the image signal input end of the deserializer U5 is connected with a second wiring row J1, the second wiring row J1 is used for being connected with the image signal output end of the automobile host, the image signal output end of the deserializer U5 is connected with the image signal input end of an OSD chip U10, and the image signal output end of the OSD chip U10 is connected with the image signal input end of a connector FPC 1;

the power supply circuit is characterized by further comprising a power supply circuit, wherein one power input end of the power supply circuit is connected with a wiring row P1, the wiring row P1 is connected with an external power supply, a first power supply end of the power supply circuit is connected with a voltage input end of a fourth voltage reduction circuit, a second power supply end of the power supply circuit is connected with a voltage input end of the first voltage reduction circuit, a voltage output end of the first voltage reduction circuit is connected with a voltage input end of the second voltage reduction circuit and a voltage input end of the third voltage reduction circuit, and a power output end, a wake-up circuit and an image signal transmission circuit.

Specifically, the power supply circuit includes a first wiring row P1, a first end of which is connected to one end of a transient suppression diode TVS1, one end of a capacitor C2, an anode of a diode D2, and an anode of the diode D1, the first end of the first wiring row P1 is used to connect to an external power source, the other end of the capacitor C2 is connected to a power ground, the other end of the transient suppression diode TVS1 is connected to a second end of the first wiring row P1, the second end of the first wiring row P1 is used to connect to the power ground, a cathode of the diode D2 is connected to a cathode of the diode D1, one end of the capacitor C4, one end of the capacitor C3, and one end of the inductor L1, and the other end of the capacitor C4 and the other end of the capacitor C3 are all connected to the power ground; one end of the inductor L1 is a power supply first power supply end, the other end of the inductor L1 is a power supply second power supply end, the other end of the inductor L1 is connected with one end of the capacitor C13 and the anode of the diode D11, the other end of the capacitor C13 is connected with the power supply ground, the cathode of the diode D11 is connected with the voltage input end of the voltage stabilizer U1, one end of the capacitor C4, one end of the capacitor C10 and one end of the resistor R4, the other end of the capacitor C4 and the other end of the capacitor C10 are connected with the power supply ground, the other end of the resistor R4 is connected with the enabling end of the voltage stabilizer U1, the voltage output end of the voltage stabilizer U1 outputs 3.3V voltage to supply power to the MCUU2, the voltage output end of the voltage stabilizer U1 is connected with one end of the capacitor C11 and one end of the capacitor C27, and the other end of the capacitor C11 and the other end of the capacitor C27 are connected with the power supply ground; the reset end of the voltage stabilizer U1 is connected with one end of a resistor R15, the fault end of the voltage stabilizer U1 is connected with one end of a resistor R16, and the other end of the resistor R15 and the other end of the resistor R16 are both connected with the input end of an MCUU2 reset signal; the reset delay end of the voltage stabilizer U1 is connected with one end of a capacitor C12, the other end of the capacitor C12 is connected with power ground, the ROSC end of the voltage stabilizer U1 is connected with one end of a resistor R12, and the other end of the resistor R12 is connected with power ground;

The negative electrode of the diode D1 is connected with one end of a resistor R126, the other end of the resistor R126 is connected with one end of a resistor R1 and one end of a resistor R144, the other end of the resistor R1 is connected with one end of a resistor R2 and the first end of MCUU2 power supply sampling, the other end of the resistor R2 is connected with one end of a capacitor C1 and power supply ground, and the other end of the capacitor C1 is connected with the other end of the resistor R1; the other end of the resistor R144 is connected with one end of the resistor R143, and the other end of the resistor R143 is connected with one end of the resistor R145 and the MCUU2 power supply sampling second end; the other end of the resistor R145 is connected with one end of the capacitor C150 and the power ground, and the other end of the capacitor C150 is connected with one end of the resistor R145.

The first step-down circuit comprises a step-down DC-DC converter U3 enabling signal input end connected with one end of a resistor R26 and one end of a resistor R28, the other end of the resistor R28 is connected with power ground, the other end of the resistor R26 is connected with an MCUU2 working voltage power supply enabling output end, the step-down DC-DC converter U3 voltage input end is connected with a power supply second power supply end, one end of a capacitor C28, one end of a capacitor C29 and one end of a capacitor C30, and the other end of the capacitor C28, the other end of the capacitor C29 and the other end of the capacitor C30 are all connected with power ground; the voltage-reducing DC-DC converter U3BOOT end is connected with one end of a resistor R25, the other end of the resistor R25 is connected with one end of a capacitor C25, the other end of the capacitor C25 is connected with one end of a resistor R24, the other end of the resistor R24 is connected with one end of a capacitor C26, and the other end of the capacitor C26 is connected with power ground; the output end of the switch of the step-down DC-DC converter U3 is connected with one end of an inductor L3, the cathode of a diode D7 and one end of a resistor R24, the other end of the inductor L3 outputs 3.3V power supply voltage for supplying power to the deserializer U5, the MSPI communication interface U11, the LCD power supply chip U7 and the optical sensor U13, the other end of the inductor L3 is connected with one end of a capacitor C32, one end of a capacitor C33, one end of a capacitor C34 and one end of a capacitor C31, and the other end of the capacitor C32, the other end of the capacitor C33, the other end of the capacitor C34, the other end of the capacitor C31 and the anode of the diode D7 are connected with power ground;

The other end of the inductor L3 is connected with one end of a resistor R77, the other end of the resistor R77 is connected with the input end of the MCUU2 first voltage reduction sampling signal, one end of a resistor R78 and one end of a capacitor C114, and the other ends of the resistor R78 and the capacitor C114 are connected with power ground;

the other end of the inductor L3 is connected with one end of the filter L17, and the other end of the filter L17 outputs 3.3V voltage for supplying power to the OSD chip U10; the other end of the filter L17 is connected with one end of a capacitor C131, one end of a capacitor C132, one end of a capacitor C133, one end of a capacitor C134, one end of a capacitor C135, one end of a capacitor C136, one end of a capacitor C137, one end of a capacitor C138, one end of a capacitor C139 and one end of a capacitor C140, the other end of the capacitor C131, the other end of the capacitor C132, the other end of the capacitor C133, the other end of the capacitor C134, the other end of the capacitor C135, the other end of the capacitor C136, the other end of the capacitor C137, the other end of the capacitor C138, the other end of the capacitor C139 and the other end of the capacitor C140 are all connected with a power supply ground;

the inverting input of the step-down DC-DC converter U3 is connected with one end of a resistor RFBB1 and one end of a resistor RFBT1, the other end of the resistor RFBB1 is connected with the power ground, the other end of the resistor RFBT1 is connected with one end of a resistor RFBT2, and the other end of the resistor RFBT2 is connected with the other end of a inductor L3;

the oscillating end of the buck DC-DC converter U3 is connected with one end of a resistor R29, the other end of the resistor R29 is connected with the power ground, the starting time end of the buck DC-DC converter U3 is connected with one end of a resistor R27 and one end of a capacitor C36, the other end of the resistor R27 is connected with one end of a capacitor C35, and the other end of the capacitor C35 and the other end of the capacitor C36 are connected with the power ground;

The second voltage reduction circuit comprises a voltage stabilizer U4, wherein the voltage input end of the voltage stabilizer U4 is connected with the other end of an inductor L3, one end of a resistor R30 and one end of a capacitor C37, the other end of the resistor R30 is connected with an enabling signal input end of the voltage stabilizer U4 and one end of a resistor R32, the other end of the capacitor C37 and the other end of the resistor R32 are all connected with power ground, the voltage output end of the voltage stabilizer U4 outputs 1.2V working voltage for supplying power to a deserializer, one end of the resistor RFBT3 is connected, the normal start end of the voltage stabilizer U4, one end of a capacitor C38, one end of a resistor R31 and one end of a resistor R79 are connected, the other end of the resistor RFBT3 is connected with the feedback voltage input end of the voltage stabilizer U4 and one end of a resistor RFBB2, the other end of the resistor C38 and the other end of the resistor R31 are all connected with power ground, the other end of the resistor R79 is connected with the second voltage reduction sampling signal input end of the MCUU2, one end of a resistor R167 and one end of the capacitor C115, and the other end of the resistor C115 are all connected with power ground.

The third voltage reduction circuit comprises a voltage stabilizer U12, wherein the voltage input end of the voltage stabilizer U12 is connected with the other end of an inductor L3, one end of a resistor R89 and one end of a capacitor C127, the other end of the resistor R89 is connected with the enabling signal input end of the voltage stabilizer U12 and one end of a resistor R91, the other end of the capacitor C127 and the other end of the resistor R91 are both connected with power ground, the voltage output end of the voltage stabilizer U12 outputs 1.5V working voltage and is used for supplying power to a deserializer, one end of a resistor RFBT6, the normal start end of the voltage stabilizer U12, one end of a capacitor C128 and one end of a resistor R90 are connected, the other end of the resistor RFBT6 is connected with the feedback voltage input end of the voltage stabilizer U12 and one end of a resistor RFBB4, and the other end of the capacitor C128 and the other end of the resistor R90 are all connected with the power ground;

The voltage output end of the voltage stabilizer U12 is connected with one end of the filter L18, the other end of the filter L18 outputs 1.5V voltage and is used for supplying power to the OSD chip U10, the other end of the filter L18 is connected with one end of the resistor R168, the other end of the resistor R168 is connected with a MCUU2OSD1.5 power supply sampling signal input end, one end of the resistor R169 and one end of the capacitor C116, and the other end of the resistor R169 and the other end of the capacitor C116 are connected with power ground.

The fourth step-down circuit comprises a CAN power supply chip U9 voltage input end, a first power supply end and a capacitor C26 end, wherein one end of the capacitor C126 and a grounding end of the CAN power supply chip U9 are both connected with power supply ground, the voltage output end of the CAN power supply chip U9 outputs 5V voltage for supplying power to a CAN transceiver U8, the voltage output end of the CAN power supply chip U9 is connected with one end of a capacitor C125, the other end of the capacitor C125 is connected with power supply ground, a reset output end of the CAN power supply chip U9 is connected with one end of a resistor R53, the other end of the resistor R53 is connected with one end of a resistor R52 and a MCUCAN power supply fault signal input end, and the other end of the resistor R52 is connected with a voltage output end of a voltage stabilizer U1; the delay reset end of the CAN power supply chip U9 is connected with one end of the capacitor Css1, and the other end of the capacitor Css1 is connected with power ground.

The first end of the second wiring row J1 is connected with the first end of the filter L11 and one end of the ESD inhibitor ESD5, and the other end of the ESD inhibitor ESD5 is connected with the power supply ground; the third end of the second wiring bank J1 is connected with the second end of the filter L11 and one end of the ESD inhibitor ESD6, and the other end of the ESD inhibitor ESD6 is connected with the power supply ground; the third end of the filter L11 is connected with one end of a capacitor C73, the other end of the capacitor C73 is connected with the second RIN anode end of the deserializer U5, the fourth end of the filter L11 is connected with one end of a capacitor C74, and the other end of the capacitor C74 is connected with the second RIN cathode end of the deserializer U5; the second terminal of the second wiring bank J1 is connected with the first terminal of the filter L10 and one terminal of the ESD inhibitor ESD4, and the other terminal of the ESD inhibitor ESD4 is connected with the power supply ground; the fourth end of the second wiring bank J1 is connected with the second end of the filter L10 and one end of the ESD3, and the other end of the ESD3 is connected with the power supply ground; the third end of the filter L10 is connected with one end of a capacitor C71, the other end of the capacitor C71 is connected with the first RIN anode end of the deserializer U5, the fourth end of the filter L10 is connected with one end of a capacitor C72, and the other end of the capacitor C72 is connected with the first RIN cathode end of the deserializer U5;

The MCUU2LVDS enable signal output end is connected with one end of a resistor R43, the other end of the resistor R43 is connected with one end of a resistor R41, one end of a resistor R42 and the inner working voltage output end of a deserializer U5 are connected with each other, the other end of the resistor R41 is connected with one end of a resistor R39 and the inner working voltage output end of the deserializer U5, the other end of the resistor R39 is connected with one end of a resistor R40 and the inner working voltage output end of the deserializer U5 are connected with each other, and the other ends of the resistor R40 and the resistor R42 are connected with the power ground;

the MCUU2LVDSI2C bus data signal transmission end is connected with one end of a resistor R128, and the other end of the resistor R128 is connected with one end of a resistor R46 and the deserializer U5LVDSI2C bus data signal transmission end; the MCUU2LVDSI2C bus clock signal transmission end is connected with one end of a resistor R127, and the other end of the resistor R127 is connected with one end of a resistor R45 and the deserializer U5LVDSI2C bus clock signal transmission end; the other end of the resistor R46 and the other end of the resistor R45 are connected with an internal working voltage output end; the output end of the MCUU2LVDS power saving mode is connected with one end of a resistor R48, the other end of the resistor R48 is connected with the positive electrode of a diode D8, one end of a resistor R44 and the input pin of the deserializer U5 in the power saving mode, and the negative electrode of the diode D8 and the other end of the resistor R44 are connected with the output end of the working voltage in the deserializer U5;

the MCUU2LVDS backlight enable signal output end is connected with one end of a resistor R51, and the other end of the resistor R51 is connected with the deserializer U5LVDS backlight enable signal input end; the output end of the MCUU2LVDS backlight PWM signal is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with the input end of the deserializer U5LVDS backlight PWM signal; the output end of the MCUU2LVDS backlight PWM signal is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with the input end of the deserializer U5LVDS backlight PWM signal; the MCUU2LVDS first universal signal transmission end is connected with one end of a resistor R57, and the other end of the resistor R57 is connected with the deserializer U5LVDS first universal signal transmission end; the MCUU2LVDS second common signal transmission end is connected with one end of a resistor R58, and the other end of the resistor R58 is connected with the deserializer U5LVDS second common signal transmission end; the deserializer U5 is connected with one end of a resistor R49, the other end of the resistor R49 is connected with the MCUU2LVDS locking state input end, the deserializer U5 is connected with one end of a resistor R50 through the state output end, and the other end of the resistor R50 is connected with the MCUU2LVDS passing state input end;

The deserializer U5TFTOLV signal transmission line is connected with the first filter bank TFTOLV signal input end, the first filter bank TFTOLV signal output end is connected with the OSD chip U10TFTOLV signal input line, the OSD chip U10TFTOLV signal output line is connected with the connector FPC1TFTOLV signal input line, the deserializer U5TFTELV signal transmission line is connected with the second filter bank TFTELV signal input end, the second filter bank TFTELV signal output end is connected with the OSD chip U10TFTELV signal input line, and the OSD chip U10TFTELV signal output line is connected with the connector FPC1TFTELV signal input line; the clock signal input end of the connector FPC1 is connected with one end of a resistor R97, the other end of the resistor R97 is connected with the clock signal output end of the MCUU2TFT, the data signal output end of the MCUU2TFT is connected with one end of a resistor R96, the other end of the resistor R96 is connected with the data signal input end of the connector FPC1, the enable signal output end of the MCUU2TFT is connected with one end of a resistor R99, the other end of the resistor R99 is connected with the enable signal input end of the connector FPC1, the reset signal output end of the MCUU2TFT is connected with one end of a resistor R101, the other end of the resistor R101 is connected with the reset signal input end of the connector FPC1, the switch signal transmission end of the MCUU2TFT is connected with one end of a resistor R106, the other end of the resistor R108 is connected with the power ground; the MCUU2TFT fault signal transmission end is connected with one end of a resistor R111, the other end of the resistor R111 is connected with the fault signal transmission end of the connector FPC1 and one end of a resistor R112, and the other end of the resistor R112 is connected with power ground;

The voltage input end of the LED driver U6 is connected with a second power supply end of a power supply, one end of an inductor L12, one end of a capacitor C84, one end of a capacitor C85 and one end of a capacitor C86, the other end of the capacitor C84, the other end of the capacitor C85 and the other end of the capacitor C86 are connected with power supply ground, the enabling signal input end of the LED driver U6 is connected with one end of a resistor R60, the other end of the resistor R60 is connected with the backlight enabling signal output end of an MCUU2TFT, the PWM signal input end of the LED driver U6 is connected with one end of a resistor R64, and the other end of the resistor R64 is connected with the backlight PWM signal output end of the MCUU2 TFT; the working voltage output end of the LED driver U6 is connected with one end of a resistor R66, one end of a resistor R65 and the cathode of a diode D10, the anode of the diode D10 and one end of the resistor R65 are both connected with one end of a capacitor C92, and the other end of the capacitor C92 is connected with power ground; the other end of the resistor R66 is connected with the fault end of the LED driver U6 and one end of the resistor R70, and the other end of the resistor R70 is connected with the backlight fault signal output end of the MCUU2 TFT;

the other end of the inductor L12 is connected with the voltage output end of the LED driver U6, the anode of the diode D9 and one end of the resistor R59, the other end of the resistor R59 is connected with one end of the capacitor C83, and the other end of the capacitor C83 is connected with the power ground; the cathode of the diode D9 is a TFT backlight power supply end; the capacitor is also connected with one end of a capacitor C88, one end of a capacitor C89, one end of a capacitor C87 and one end of a capacitor C90, and the other end of the capacitor C88, the other end of the capacitor C89, the other end of the capacitor C87 and the other end of the capacitor C90 are connected with power ground; the TFT backlight power supply end is connected with one end of an inductor L24, the other end of the inductor L24 is connected with one end of a capacitor C102, one end of a resistor R172 and the voltage input end of a connector FPC2, the other end of the capacitor C102 is connected with power ground, the other end of the resistor R172 is connected with one end of a resistor R173, one end of a capacitor C151 and the MCUU2TFT backlight power supply sampling signal input end, and the other end of the resistor R173 and the other end of the capacitor C151 are connected with power ground;

The first backlight signal output end of the LED driver U6 is connected with one end of a resistor R105, the other end of the resistor R105 is connected with the first backlight signal input end of the connector FPC2, the second backlight signal output end of the LED driver U6 is connected with one end of a resistor R110, the other end of the resistor R110 is connected with the second backlight signal input end of the connector FPC2, the third backlight signal output end of the LED driver U6 is connected with one end of a resistor R113 and one end of a resistor R174, the other end of the resistor R113 is connected with the third backlight signal input end of the connector FPC2, the other end of the resistor R174 is connected with one end of a resistor R175, one end of a capacitor C152 and the third backlight PWM signal sampling end of the MCUU2, the fourth backlight signal output end of the LED driver U6 is connected with one end of a resistor R114 and one end of a resistor R176, the other end of the resistor R114 is connected with the fourth backlight signal input end of the connector FPC2, and the other end of the resistor R176 is connected with one end of the resistor R177, one end of the capacitor C153 and the fourth backlight PWM signal sampling end of the MCUU 2; the MCUU2TFT backlight enabling signal output end is connected with one end of a resistor R107, the other end of the resistor R107 is connected with one end of a resistor R109, one end of a capacitor C105 and the base electrode of a triode Q4, the emitter electrode of the triode Q4, the other end of the resistor R109 and the other end of the capacitor C105 are connected with the power ground, the collector electrode of the triode Q4 is connected with one end of a resistor R104, the other end of the resistor R104 is connected with one end of a capacitor C100, one end of the triode Q3 and the other end of the resistor R102 are both connected with the voltage output end of a voltage stabilizer U1, the collector electrode of the triode Q3 is connected with the other end of the capacitor C100, one end of the capacitor C101 and one end of the resistor R100, the other end of the capacitor C101 is connected with the power ground, one end of the resistor R100 is connected with the input end of the FPC2TFT backlight enabling signal, the other end of the resistor R98 is connected with one end of the capacitor C99 and the MCUU2TFT TNTC sampling end, and the other end of the capacitor C99 is connected with the power ground;

The MCUU2SPI communication starting signal output end is connected with the OSD chip U10SPI communication starting signal input end, the MCUU2SPI communication signal output end is connected with the OSD chip U10SPI communication signal input end, the MCUU2SPI communication signal input end is connected with the OSD chip U10SPI communication signal output end, the MCUU2SPI communication clock signal transmission end is connected with the OSD chip U10SPI communication clock signal transmission end, the MCUU2OSD reset output end is connected with one end of a resistor R136, the other end of the resistor R136 is connected with one end of a resistor R135, one end of a capacitor C141 and the OSD chip U10 reset signal input end, the other end of the resistor R135 is connected with the other end of an inductor L3, the other end of the capacitor C141 is connected with the power ground, the MCUU2OSD fault signal input end is connected with one end of a resistor R138, the other end of the resistor R138 is connected with the OSD chip U10 fault signal input end, and the other end of the resistor R137 is connected with the other end of the inductor L3;

The wake-up circuit comprises a first wiring row P1, a third end of the first wiring row P1 is connected with one end of an ESD inhibitor ESD1B, one end of a capacitor C5 and the positive electrode of a diode D3, the third end of the first wiring row P1 is used for being connected with an automobile ignition signal input end, the other end of the ESD inhibitor ESD1B and one end of the capacitor C5 are both connected with power ground, the negative electrode of the diode D3 is connected with one end of a resistor R80, the other end of the resistor R80 is connected with one end of a resistor R81, one end of the capacitor C117 and the base electrode of a triode Q6, the other end of the resistor R81, the other end of the capacitor C117 and the emitter of the triode Q6 are both connected with power ground, the collector of the triode Q6 is connected with the enabling end of a voltage regulator U1 watchdog and one end of a resistor R17, and the other end of the resistor R17 is connected with power ground; the other end of the voltage input end of the voltage stabilizer U1 is connected with the voltage output end of the voltage stabilizer U1;

the negative pole of diode D3 still connects resistance R10 one end, resistance R10 other end connecting resistance R11 one end, electric capacity C9 one end and triode Q2 base, the power ground is all connected to the resistance R11 other end, the electric capacity C9 other end and triode Q2 projecting pole, triode Q2 collecting electrode connecting resistance R9 one end, triode Q1 base and resistance R8 one end are connected to the resistance R9 other end, voltage stabilizer U1 voltage output end and triode Q1 projecting pole are connected to the resistance R8 other end, triode Q1 collecting electrode connecting resistance R7 one end, electric capacity C8 one end and MCUU2 wake-up signal input end, the power ground is all connected to the resistance R7 other end and the electric capacity C8 other end.

The voltage input end of the LCD power supply chip U7 is connected with the other end of the inductor L3, one end of the capacitor C109 and one end of the capacitor C110, the other end of the capacitor C109, the other end of the capacitor C110 and the grounding end of the LCD power supply chip U7 are connected with the power supply ground, the enabling signal input end of the LCD power supply chip U7 is connected with one end of the resistor R123 and one end of the resistor R121, the other end of the resistor R121 is connected with the power supply ground, the other end of the resistor R123 is connected with the MCUU2LCD power supply enabling signal output end, the voltage output end of the LCD power supply chip U7 outputs 3.3V voltage for supplying power to the LCD, the voltage output end of the LCD power supply chip U7 is connected with one end of the resistor R22 and one end of the capacitor C111, the other end of the capacitor C111 is connected with the power supply ground, the fault output end of the LCD power supply chip U7 is connected with one end of the resistor R122, one end of the resistor R124 and one end of the capacitor C112, the other end of the resistor R124 is connected with the input end of the MCUU2LCD power supply fault signal, and the other end of the capacitor C112 is connected with the power supply ground.

The working voltage input end of the optical sensor U13 is connected with the voltage output end of the voltage stabilizer U1, one end of the capacitor C148 and one end of the capacitor C149, the other end of the capacitor C148 and the other end of the capacitor C149 are connected with power ground, the reference resistance end of the optical sensor U13 is connected with one end of the resistor R141, the other end of the resistor R141 and the grounding end of the optical sensor U13 are both connected with power ground, the signal output end of the optical sensor U13 is connected with one end of the resistor R142 and one end of the resistor R54, the other end of the resistor R142 is connected with the input end of the MCUU2 light detection signal, the clock end of the optical sensor U13 is connected with the clock end of the MCUU2 light detection signal and one end of the resistor R55, the data end of the optical sensor U13 is connected with the data end of the MCUU2 light detection signal and one end of the resistor R146, and one end of the resistor R54, and the other end of the resistor R55 and the other end of the resistor R146 are both connected with the voltage output end of the voltage stabilizer U1.

The CAN bus connection circuit comprises a CAN transceiver U8 working voltage input end, a CAN power supply chip U9 voltage output end and a capacitor C120 end, wherein the other end of the capacitor C120 is connected with power ground, the low-level end of the CAN transceiver U8 is connected with a third end of a filter L14 and one end of a resistor R82, the other end of the resistor R82 is connected with a second end of the filter L14, and the other end of the resistor R82 is connected with a seventh end of a first wiring row P1; the high-level end of the CAN transceiver U8 is connected with the fourth end of the filter L14 and one end of a resistor R88, the other end of the resistor R88 is connected with the first end of the filter L14, the other end of the resistor R88 is connected with the sixth end of a first wiring row P1, the seventh end and the sixth end of the first wiring row P1 are connected with an automobile CAN bus, the other end of the resistor R88 is connected with one end of a resistor R86, one end of a capacitor C123 and the first end of an ESD inhibitor ESD7, the other end of the resistor R86 is connected with one end of a capacitor C122 and one end of a resistor R84, the other end of the resistor R84 is connected with the other end of the resistor R82, the other end of the resistor R82 is also connected with one end of a capacitor C121, and the other ends of the capacitor C121 and the capacitor C123 are both connected with power ground;

the CAN transceiver U8 transmitting end is connected with one end of a resistor R83, the other end of the resistor R83 is connected with the MCUU2CAN signal transmitting end, the other end of the resistor R85 is connected with the MCUU2CAN signal receiving end, the standby end of the CAN transceiver U8 is connected with one end of a resistor R87 and the standby end of the MCUU2CAN, and the other end of the resistor R87 and the grounding end of the CAN transceiver are connected with the power supply ground.

The invention also comprises a working method of the power supply circuit, which comprises the following steps:

s1, starting ignition;

s2, judging whether the power supply is normal.

In step S1, the method for determining ignition start includes:

MCU (U2) judges whether the voltage value received by MCU wake-up signal input terminal is greater than or equal to the preset voltage threshold value:

if the voltage value received by the MCU wake-up signal input end is greater than or equal to a preset voltage threshold value, the ignition is started, and the MCU (U2) wakes up and is switched to a working state; the calculation method of the preset voltage threshold value comprises the following steps:

U ₁ ＝U _{MCU_3V3} -U _Q1 -|U′ ₁ |，

wherein U is ₁ Representing a preset voltage threshold;

U _{MCU_3V3} representing the voltage value output by the voltage output end of the voltage stabilizer U1;

representing the drop voltage value of transistor Q1;

U′ ₁ representing the system error voltage, which is 0.5V-0.8V;

the absolute value is taken;

if the voltage value received by the MCU wake-up signal input end is smaller than the preset voltage threshold value, flameout is indicated, and the MCU (U2) is switched to a sleep state.

The method for judging whether the power supply is normal in the step S2 comprises the following steps:

s21, the MCU (U2) acquires a voltage value received by the first end of MCU power supply sampling, and the MCU (U2) samples the actual first sampling value of the voltage value received by the first end of MCU power supply sampling:

The calculation method of the actual first sampling value comprises the following steps:

wherein P is ₀ Representing the voltage value received by the MCU power supply sampling first end;

U _BATTERY representing an actual first sample value;

the representation takes the smaller of the two;

representing the drop voltage value of diode D1;

representing the drop voltage value of diode D2;

R ₁ the resistance value of the resistor R1;

R ₂ the resistance value of the resistor R2;

R ₁₂₆ representing the resistance of resistor R126;

s22, the MCU (U2) acquires a voltage value received by the MCU power supply sampling second end, and the MCU (U2) acquires an actual second sampling value according to the voltage value received by the MCU power supply sampling second end:

the actual second sampling value calculating method comprises the following steps:

wherein P' ₀ Representing MCU power supply sampling second endThe received voltage value;

U′ _BATTERY representing an actual second sample value;

the representation takes the smaller of the two;

representing the drop voltage value of diode D1;

representing the drop voltage value of diode D2;

R ₁₂₆ representing the resistance of resistor R126;

R ₁₄₃ a resistance value of the resistor R143;

R ₁₄₄ the resistance value of the resistor R144;

R ₁₄₅ a resistance value of the resistor R145;

s23, judging the actual first sampling value U _BATTERY And the actual second sampling value U' _BATTERY Size relationship between:

if |U _BATTERY -U′ _BATTERY |≤U ₀ ，U ₀ The normal threshold value of the preset voltage is generally 0.15V-0.25V, and an actual sampling value is obtained, wherein the actual sampling value is calculated by the following steps:

Wherein max (U _BATTERY ,U′ _BATTERY ) The representation takes the larger of the two;

judging the magnitude relation between the actual sampling value and a preset first voltage threshold value of the storage battery and a second voltage threshold value of the storage battery:

if U' ₀ ≥P ₁ Wherein U 'is' ₀ Representing the actual sampled value; p (P) ₁ Representing a preset first voltage threshold of the storage battery; the battery is charged sufficiently at this time;

if P ₂ ≤U′ ₀ ＜P ₁ Wherein P is ₂ Representing a preset second voltage threshold of the storage battery; u's' ₀ Representing the actual sampled value; the second voltage threshold value of the preset storage battery is smaller than the first voltage threshold value of the preset storage battery, P ₁ Representing a preset first voltage threshold of the storage battery; the battery is not charged enough at this time;

if U' ₀ ＜P ₂ Wherein U 'is' ₀ Representing the actual sampled value; p (P) ₂ Representing a preset second voltage threshold of the storage battery; the battery is too low in electric quantity and the battery (external power supply) needs to be charged;

if |U _BATTERY -U′ _BATTERY |＞U ₀ The battery is not working properly and a warning is issued.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An instrument display device convenient to installation, includes screen assembly, support (4), PCB board (5) and backshell (6) that set gradually from front to back, its characterized in that: the automobile is characterized in that two L-shaped clips (3) used for being clamped on an automobile body are arranged at left and right intervals at the top of the bracket (4), the L-shaped clips (3) are located above the rear shell (6), a plurality of mounting lugs (2) used for being mounted on the automobile body are arranged at left and right intervals at the bottom of the bracket (4), mounting holes are formed in the mounting lugs (2) and are mounted on the automobile body in a matched mode, the mounting lugs (2) are located below the rear shell (6), and the bottom ends of the mounting lugs (2) extend in a backward inclined mode;

the screen assembly comprises a glass cover plate (1) and a liquid crystal screen (1 a), wherein the glass cover plate (1) extends out of the liquid crystal screen (1 a), a glass mounting groove for mounting the glass cover plate (1) is concavely formed in the front side of the bracket (4), a screen mounting groove for mounting the liquid crystal screen (1 a) is concavely formed in the bottom of the glass mounting groove, the notch of the screen mounting groove is sealed through the glass cover plate (1), and a separation frame for supporting the back of the liquid crystal screen (1 a) is arranged in the screen mounting groove, so that the liquid crystal screen (1 a) is separated from the bottom of the screen mounting groove;

The position of the support (4) corresponding to the glass mounting groove is provided with a light guide hole (4 e), a light guide column is arranged in the light guide hole (4 e), one side of the PCB (5) extends to the rear of the light guide column and is provided with a light sensor U13 for sensing external light of the instrument, the light sensor U13 is used for guiding light through the light guide column, the rear side of the support (4) is circumferentially provided with a plurality of first positioning clamping columns (4 d) for mounting and positioning the rear shell (6), the PCB (5) is provided with a first yielding notch (5 a) corresponding to the first positioning clamping column (4 d), the rear shell (6) is provided with a second positioning clamping column (6 a), and the first positioning clamping column (4 d) is provided with a clamping hole for clamping the second positioning clamping column (6 a) and extending forwards and backwards; the second positioning clamping column (6 a) is clamped on the first positioning clamping column (4 d);

the partition frame comprises vertical lapping bars (4 a) and transverse bars (4 b) which are arranged at left and right intervals, wherein the transverse bars (4 b) are used for connecting all the vertical lapping bars (4 a) together, the upper end and the lower end of each lapping bar (4 a) are respectively arranged on the inner side wall of a screen mounting groove, the left end and the right end of each transverse bar (4 b) are respectively arranged on the inner side wall of the screen mounting groove, clamping grooves for clamping the transverse bars (4 b) are respectively arranged on the front sides of all the lapping bars (4 a), so that the transverse bars (4 b) are flush with the front sides of the lapping bars (4 a), positioning bars (4 c) which extend vertically are integrally formed on the transverse bars (4 b) and the positioning bars (4 c) are distributed in a cross shape, and positioning grooves for clamping the positioning bars (4 c) are respectively arranged on the front sides of any one lapping bar (4 a);

The first positioning clamping column (4 d) and the second positioning clamping column (6 a) are in a 'shape, the clamping holes are a space surrounded by the' shape, the second positioning clamping column (6 a) is inserted into the clamping holes of the first positioning clamping column (4 d), and the openings of the second positioning clamping column (6 a) and the first positioning clamping column (4 d) are arranged oppositely;

the three first positioning clamping columns (4 d) are respectively arranged on the left side, the right side and the top of the bracket (4), the first positioning clamping columns (4 d) close to the light guide column are arranged in the middle of the PCB (5), and the other two first positioning clamping columns (4 d) are arranged on the edge of the PCB (5);

the three mounting lugs (2) are arranged from left to right, the centrally arranged mounting lugs (2) are lower than the left and right mounting lugs (2), the mounting lugs (2) positioned on the left and right are symmetrically arranged along the vertical central line of the instrument, and a second yielding gap (6 b) for yielding the left and right mounting lugs (2) is arranged at the bottom of the rear shell (6);

the system also comprises a working circuit, wherein the working circuit comprises an MCU (U2), the wake-up signal input end of the MCU (U2) is connected with one end of the wake-up circuit, the other end of the wake-up circuit is connected with a wiring row P1, and the working circuit is connected with the wake-up signal output end of the automobile host through the wiring row P1; the light detection signal input end of the MCU (U2) is connected with the detection signal output end of the light sensor U13, the backlight adjustment signal output end of the TFT of the MCU (U2) is connected with the backlight signal input end of the LED driver U6, and the adjustment output end of the LED driver U6 is connected with the adjustment signal input end of the connector FPC 2;

the power supply circuit is characterized by further comprising a power supply circuit, wherein one power supply input end of the power supply circuit is connected with a wiring row P1, the wiring row P1 is connected with an external power supply, a first power supply end of the power supply circuit is connected with a voltage input end of a fourth voltage reduction circuit, a second power supply end of the power supply circuit is connected with a voltage input end of the first voltage reduction circuit, and a voltage output end of the first voltage reduction circuit is connected with a voltage input end of the second voltage reduction circuit and a voltage input end of the third voltage reduction circuit;

the power supply circuit comprises a first wiring row P1, wherein the first end of the first wiring row P1 is connected with one end of a transient suppression diode TVS1, one end of a capacitor C2, the positive electrode of a diode D2 and the positive electrode of the diode D1, the first end of the first wiring row P1 is used for being connected with an external power supply, the other end of the capacitor C2 is connected with a power supply ground, the other end of the transient suppression diode TVS1 is connected with a first wiring row P1 second end, the second end of the first wiring row P1 is used for being connected with the power supply ground, the negative electrode of the diode D2 is connected with the negative electrode of the diode D1, one end of a capacitor C4, one end of a capacitor C3 and one end of an inductor L1, and the other end of the capacitor C4 and the other end of the capacitor C3 are all connected with the power supply ground; one end of the inductor L1 is a power supply first power supply end, the other end of the inductor L1 is a power supply second power supply end, the other end of the inductor L1 is connected with one end of the capacitor C13 and the anode of the diode D11, the other end of the capacitor C13 is connected with the power supply ground, the cathode of the diode D11 is connected with the voltage input end of the voltage stabilizer U1, one end of the capacitor C4, one end of the capacitor C10 and one end of the resistor R4, the other end of the capacitor C4 and the other end of the capacitor C10 are connected with the power supply ground, the other end of the resistor R4 is connected with the enabling end of the voltage stabilizer U1, the voltage output end of the voltage stabilizer U1 outputs 3.3V voltage to supply power for the MCU (U2), the voltage output end of the voltage stabilizer U1 is connected with one end of the capacitor C11 and one end of the capacitor C27, and the other end of the capacitor C11 and the other end of the capacitor C27 are connected with the power supply ground; the reset end of the voltage stabilizer U1 is connected with one end of a resistor R15, the fault end of the voltage stabilizer U1 is connected with one end of a resistor R16, and the other end of the resistor R15 and the other end of the resistor R16 are both connected with the reset signal input end of the MCU (U2); the reset delay end of the voltage stabilizer U1 is connected with one end of a capacitor C12, the other end of the capacitor C12 is connected with power ground, the ROSC end of the voltage stabilizer U1 is connected with one end of a resistor R12, and the other end of the resistor R12 is connected with power ground;

The negative electrode of the diode D1 is connected with one end of a resistor R126, the other end of the resistor R126 is connected with one end of a resistor R1 and one end of a resistor R144, the other end of the resistor R1 is connected with one end of a resistor R2 and a first end of MCU (U2) power supply sampling, the other end of the resistor R2 is connected with one end of a capacitor C1 and power supply ground, and the other end of the capacitor C1 is connected with the other end of the resistor R1; the other end of the resistor R144 is connected with one end of the resistor R143, and the other end of the resistor R143 is connected with one end of the resistor R145 and the MCU (U2) power supply sampling second end; the other end of the resistor R145 is connected with one end of the capacitor C150 and the power ground, and the other end of the capacitor C150 is connected with one end of the resistor R145;

the first voltage reduction circuit comprises a voltage reduction DC-DC converter (U3), wherein an enabling signal input end of the voltage reduction DC-DC converter (U3) is connected with one end of a resistor R26 and one end of a resistor R28, the other end of the resistor R28 is connected with power ground, the other end of the resistor R26 is connected with a MCU (U2) working voltage power supply enabling output end, a voltage input end of the voltage reduction DC-DC converter (U3) is connected with a second power supply end of the power supply, one end of a capacitor C28, one end of a capacitor C29 and one end of a capacitor C30, and the other end of the capacitor C28, the other end of the capacitor C29 and the other end of the capacitor C30 are all connected with the power ground; the BOOT end of the step-down DC-DC converter (U3) is connected with one end of a resistor R25, the other end of the resistor R25 is connected with one end of a capacitor C25, the other end of the capacitor C25 is connected with one end of a resistor R24, the other end of the resistor R24 is connected with one end of a capacitor C26, and the other end of the capacitor C26 is connected with power ground; the output end of a switch of the step-down DC-DC converter (U3) is connected with one end of an inductor L3, the cathode of a diode D7 and one end of a resistor R24, the other end of the inductor L3 outputs 3.3V power supply voltage for supplying power to a deserializer U5, an MSPI communication interface U11, an LCD power supply chip U7 and an optical sensor U13, the other end of the inductor L3 is connected with one end of a capacitor C32, one end of a capacitor C33, one end of a capacitor C34 and one end of a capacitor C31, and the other end of the capacitor C32, the other end of the capacitor C33, the other end of the capacitor C34, the other end of the capacitor C31 and the anode of the diode D7 are connected with power ground;

The other end of the inductor L3 is connected with one end of a resistor R77, the other end of the resistor R77 is connected with a first voltage reduction sampling signal input end of the MCU (U2), one end of a resistor R78 and one end of a capacitor C114, and the other ends of the resistor R78 and the capacitor C114 are connected with power ground;

the inverting input of the step-down DC-DC converter (U3) is connected with one end of a resistor RFBB1 and one end of a resistor RFBT1, the other end of the resistor RFBB1 is connected with the power ground, the other end of the resistor RFBT1 is connected with one end of a resistor RFBT2, and the other end of the resistor RFBT2 is connected with the other end of a inductor L3;

the oscillating end of the buck DC-DC converter (U3) is connected with one end of a resistor R29, the other end of the resistor R29 is connected with the power ground, the starting time end of the buck DC-DC converter (U3) is connected with one end of a resistor R27 and one end of a capacitor C36, the other end of the resistor R27 is connected with one end of a capacitor C35, and the other end of the capacitor C35 and the other end of the capacitor C36 are connected with the power ground;

the second voltage reduction circuit comprises a voltage stabilizer U4, a resistor R30 and a capacitor C37, wherein the voltage input end of the voltage stabilizer U4 is connected with the other end of an inductor L3, one end of a resistor R30 and one end of a capacitor C37, the other end of the resistor R30 is connected with an enabling signal input end of the voltage stabilizer U4 and one end of a resistor R32, the other end of the capacitor C37 and the other end of the resistor R32 are all connected with power ground, the voltage output end of the voltage stabilizer U4 outputs 1.2V working voltage and is used for supplying power to a deserializer, one end of a resistor RFBT3, the normal start end of the voltage stabilizer U4, one end of a capacitor C38, one end of a resistor R31 and one end of a resistor R79 are connected, the other end of the resistor RFBT3 is connected with the feedback voltage input end of the voltage stabilizer U4 and one end of a resistor RFBB2, the other end of the resistor C38 and the other end of the resistor R31 are all connected with the MCU (U2) second voltage reduction sampling signal input end, one end of a resistor R167 and one end of a capacitor C115, and the other end of the resistor R115 are all connected with power ground;

the voltage output end of the voltage stabilizer U12 is connected with one end of a filter L18, the other end of the filter L18 outputs 1.5V voltage and is used for supplying power to an OSD chip U10, the other end of the filter L18 is connected with one end of a resistor R168, the other end of the resistor R168 is connected with the MCU (U2) OSD1.5 power supply sampling signal input end, one end of a resistor R169 and one end of a capacitor C116, and the other ends of the resistor R169 and the capacitor C116 are both connected with power supply ground;

2. An instrument display device for facilitating installation as defined in claim 1, wherein: the first end of the second wiring bank J1 is connected with the first end of the filter L11 and one end of the ESD inhibitor ESD5, and the other end of the ESD inhibitor ESD5 is connected with the power ground; the third end of the second wiring bank J1 is connected with the second end of the filter L11 and one end of the ESD inhibitor ESD6, and the other end of the ESD inhibitor ESD6 is connected with the power supply ground; the third end of the filter L11 is connected with one end of a capacitor C73, the other end of the capacitor C73 is connected with the second RIN anode end of the deserializer U5, the fourth end of the filter L11 is connected with one end of a capacitor C74, and the other end of the capacitor C74 is connected with the second RIN cathode end of the deserializer U5; the second terminal of the second wiring bank J1 is connected with the first terminal of the filter L10 and one terminal of the ESD inhibitor ESD4, and the other terminal of the ESD inhibitor ESD4 is connected with the power supply ground; the fourth end of the second wiring bank J1 is connected with the second end of the filter L10 and one end of the ESD3, and the other end of the ESD3 is connected with the power supply ground; the third end of the filter L10 is connected with one end of a capacitor C71, the other end of the capacitor C71 is connected with the first RIN anode end of the deserializer U5, the fourth end of the filter L10 is connected with one end of a capacitor C72, and the other end of the capacitor C72 is connected with the first RIN cathode end of the deserializer U5;

the MCU (U2) LVDS enable signal output end is connected with one end of a resistor R43, the other end of the resistor R43 is connected with one end of a resistor R41, one end of a resistor R42 and the inner working voltage output end of a deserializer U5 are connected with each other, the other end of the resistor R41 is connected with one end of a resistor R39 and the inner working voltage output end of the deserializer U5, the other end of the resistor R39 is connected with one end of a resistor R40 and the inner working voltage output end of the deserializer U5 are connected with each other, and the other ends of the resistor R40 and the resistor R42 are connected with a power supply ground;

The MCU (U2) LVDSI2C bus data signal transmission end is connected with one end of a resistor R128, and the other end of the resistor R128 is connected with one end of a resistor R46 and the deserializer U5LVDSI2C bus data signal transmission end; the MCU (U2) LVDSI2C bus clock signal transmission end is connected with one end of a resistor R127, and the other end of the resistor R127 is connected with one end of a resistor R45 and the deserializer U5LVDSI2C bus clock signal transmission end; the other end of the resistor R46 and the other end of the resistor R45 are connected with an internal working voltage output end; the MCU (U2) LVDS power saving mode output end is connected with one end of a resistor R48, the other end of the resistor R48 is connected with the positive electrode of a diode D8, one end of a resistor R44 and the power saving mode input pin of the deserializer U5, and the negative electrode of the diode D8 and the other end of the resistor R44 are connected with the internal working voltage output end of the deserializer U5;

the MCU (U2) LVDS backlight enable signal output end is connected with one end of a resistor R51, and the other end of the resistor R51 is connected with the deserializer U5LVDS backlight enable signal input end; the output end of the MCU (U2) LVDS backlight PWM signal is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with the input end of the deserializer U5LVDS backlight PWM signal; the output end of the MCU (U2) LVDS backlight PWM signal is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with the input end of the deserializer U5LVDS backlight PWM signal; the MCU (U2) LVDS first universal signal transmission end is connected with one end of a resistor R57, and the other end of the resistor R57 is connected with the deserializer U5LVDS first universal signal transmission end; the MCU (U2) LVDS second general purpose signal transmission end is connected with one end of a resistor R58, and the other end of the resistor R58 is connected with the deserializer U5LVDS second general purpose signal transmission end; the deserializer U5 is connected with one end of a resistor R49, the other end of the resistor R49 is connected with the MCU (U2) LVDS locking state input end, the deserializer U5 is connected with one end of a resistor R50 through the state output end, and the other end of the resistor R50 is connected with the MCU (U2) LVDS passing state input end;

The deserializer U5TFTOLV signal transmission line is connected with the first filter bank TFTOLV signal input end, the first filter bank TFTOLV signal output end is connected with the OSD chip U10TFTOLV signal input line, the OSD chip U10TFTOLV signal output line is connected with the connector FPC1TFTOLV signal input line, the deserializer U5TFTELV signal transmission line is connected with the second filter bank TFTELV signal input end, the second filter bank TFTELV signal output end is connected with the OSD chip U10TFTELV signal input line, and the OSD chip U10TFTELV signal output line is connected with the connector FPC1TFTELV signal input line; the connector FPC1 clock signal input end is connected with one end of a resistor R97, the other end of the resistor R97 is connected with the MCU (U2) TFT clock signal output end, the MCU (U2) TFT data signal output end is connected with one end of a resistor R96, the other end of the resistor R96 is connected with the connector FPC1 data signal input end, the MCU (U2) TFT enable signal output end is connected with one end of a resistor R99, the other end of the resistor R99 is connected with the connector FPC1 enable signal input end, the MCU (U2) TFT reset signal output end is connected with one end of a resistor R101, the other end of the resistor R101 is connected with the connector FPC1 reset signal input end, the MCU (U2) TFT switch signal transmission end is connected with one end of a resistor R106, the other end of the resistor R106 is connected with the connector FPC1 switch signal transmission end and one end of a resistor R108, and the other end of the resistor R108 is connected with power ground; the MCU (U2) TFT fault signal transmission end is connected with one end of a resistor R111, the other end of the resistor R111 is connected with the connector FPC1 fault signal transmission end and one end of a resistor R112, and the other end of the resistor R112 is connected with power ground;

The voltage input end of the LED driver U6 is connected with a second power supply end of a power supply, one end of an inductor L12, one end of a capacitor C84, one end of a capacitor C85 and one end of a capacitor C86, the other end of the capacitor C84, the other end of the capacitor C85 and the other end of the capacitor C86 are connected with power supply ground, the enabling signal input end of the LED driver U6 is connected with one end of a resistor R60, the other end of the resistor R60 is connected with the backlight enabling signal output end of an MCU (U2) TFT, the PWM signal input end of the LED driver U6 is connected with one end of a resistor R64, and the other end of the resistor R64 is connected with the backlight PWM signal output end of the MCU (U2) TFT; the working voltage output end of the LED driver U6 is connected with one end of a resistor R66, one end of a resistor R65 and the cathode of a diode D10, the anode of the diode D10 and one end of the resistor R65 are both connected with one end of a capacitor C92, and the other end of the capacitor C92 is connected with power ground; the other end of the resistor R66 is connected with the fault end of the LED driver U6 and one end of the resistor R70, and the other end of the resistor R70 is connected with the backlight fault signal output end of the MCU (U2) TFT;

the other end of the inductor L12 is connected with the voltage output end of the LED driver U6, the anode of the diode D9 and one end of the resistor R59, the other end of the resistor R59 is connected with one end of the capacitor C83, and the other end of the capacitor C83 is connected with the power ground; the cathode of the diode D9 is a TFT backlight power supply end; the TFT backlight power supply end is connected with one end of an inductor L24, the other end of the inductor L24 is connected with one end of a capacitor C102, one end of a resistor R172 and the voltage input end of a connector FPC2, the other end of the capacitor C102 is connected with power ground, the other end of the resistor R172 is connected with one end of a resistor R173, one end of a capacitor C151 and the MCU (U2) TFT backlight power supply sampling signal input end, and the other end of the resistor R173 and the other end of the capacitor C151 are connected with power ground;

The first backlight signal output end of the LED driver U6 is connected with one end of a resistor R105, the other end of the resistor R105 is connected with the first backlight signal input end of the connector FPC2, the second backlight signal output end of the LED driver U6 is connected with one end of a resistor R110, the other end of the resistor R110 is connected with the second backlight signal input end of the connector FPC2, the third backlight signal output end of the LED driver U6 is connected with one end of a resistor R113 and one end of a resistor R174, the other end of the resistor R113 is connected with the third backlight signal input end of the connector FPC2, the other end of the resistor R174 is connected with one end of a resistor R175, one end of a capacitor C152 and the third backlight PWM signal sampling end of an MCU (U2), the fourth backlight signal output end of the LED driver U6 is connected with one end of a resistor R114 and one end of a resistor R176, the other end of the resistor R114 is connected with the fourth backlight signal input end of the connector FPC2, and the other end of the resistor R176 is connected with one end of the resistor R177, one end of the capacitor C153 and the fourth backlight signal sampling end of the MCU (U2); MCU (U2) TFT backlight enable signal output end connects resistor R107 one end, resistor R107 other end connects resistor R109 one end, capacitor C105 one end and triode Q4 base, triode Q4 projecting pole, resistor R109 other end and capacitor C105 other end connect power ground, triode Q4 collecting electrode connects resistor R104 one end, resistor R104 other end connects capacitor C100 one end, resistor R102 one end and triode Q3 base, triode Q3 projecting pole and resistor R102 other end all connect the voltage output end of stabiliser U1, triode Q3 collecting electrode connects capacitor C100 other end, capacitor C101 one end and resistor R100 one end, capacitor C101 other end connects power ground, resistor R100 one end connects resistor R98 one end and connector FPC2TFT backlight enable signal input end, the capacitor R98 other end connects capacitor C99 one end and MCU (U2) TFT TNTC sampling end, the capacitor C99 other end connects power ground;

The MCU (U2) SPI communication starting signal output end is connected with the OSD chip U10SPI communication starting signal input end, the MCU (U2) SPI communication signal output end is connected with the OSD chip U10SPI communication signal input end, the MCU (U2) SPI communication signal input end is connected with the OSD chip U10SPI communication signal output end, the MCU (U2) SPI communication clock signal transmission end is connected with the OSD chip U10SPI communication clock signal transmission end, the MCU (U2) OSD reset output end is connected with one end of a resistor R136, the other end of the resistor R136 is connected with one end of a resistor R135, one end of a capacitor C141 and the OSD chip U10 reset signal input end, the other end of the resistor R135 is connected with the other end of an inductor L3, the other end of the capacitor C141 is connected with the power ground, the MCU (U2) OSD fault signal input end is connected with one end of a resistor R138, the other end of the resistor R138 is connected with one end of the resistor R137 and the OSD chip U10 fault signal input end, and the other end of the resistor R137 is connected with the other end of the inductor L3;

3. An instrument display device for facilitating installation as defined in claim 2, wherein: the wake-up circuit comprises a first wiring row P1, wherein a third end of the first wiring row P1 is connected with one end of an ESD inhibitor ESD1B, one end of a capacitor C5 and the positive electrode of a diode D3, the third end of the first wiring row P1 is used for being connected with an automobile ignition signal input end, the other end of the ESD inhibitor ESD1B and one end of the capacitor C5 are both connected with power ground, the negative electrode of the diode D3 is connected with one end of a resistor R80, the other end of the resistor R80 is connected with one end of a resistor R81, one end of the capacitor C117 and the base electrode of a triode Q6, the other end of the resistor R81, the other end of the capacitor C117 and the emitter of the triode Q6 are both connected with power ground, the collector of the triode Q6 is connected with the enabling end of a voltage regulator U1 watchdog and one end of a resistor R17, and the other end of the resistor R17 is connected with power ground; the other end of the voltage input end of the voltage stabilizer U1 is connected with the voltage output end of the voltage stabilizer U1;

the negative electrode of the diode D3 is also connected with one end of a resistor R10, the other end of the resistor R10 is connected with one end of a resistor R11, one end of a capacitor C9 and the base electrode of a triode Q2, the other end of the resistor R11, the other end of the capacitor C9 and the emitter electrode of the triode Q2 are all connected with power supply ground, the collector electrode of the triode Q2 is connected with one end of the resistor R9, the other end of the resistor R9 is connected with the base electrode of the triode Q1 and one end of the resistor R8, the other end of the resistor R8 is connected with the voltage output end of the voltage stabilizer U1 and the emitter electrode of the triode Q1, the collector electrode of the triode Q1 is connected with one end of the resistor R7, one end of the capacitor C8 and the wake-up signal input end of the MCU (U2), and the other end of the resistor R7 and the capacitor C8 are all connected with power supply ground;

The LCD power supply chip U7 voltage input end is connected with the other end of the inductor L3, one end of the capacitor C109 and one end of the capacitor C110, the other end of the capacitor C109, the other end of the capacitor C110 and the grounding end of the LCD power supply chip U7 are connected with power ground, the LCD power supply chip U7 enabling signal input end is connected with one end of the resistor R123 and one end of the resistor R121, the other end of the resistor R121 is connected with the power ground, the other end of the resistor R123 is connected with the MCU (U2) LCD power supply enabling signal output end, the voltage output end of the LCD power supply chip U7 outputs 3.3V voltage for supplying power to the LCD, the voltage output end of the LCD power supply chip U7 is connected with one end of the resistor R22 and one end of the capacitor C111, the other end of the capacitor C111 is connected with power ground, the LCD power supply chip U7 failure output end is connected with one end of the resistor R122, one end of the resistor R124 and one end of the capacitor C112, the other end of the resistor R124 is connected with the MCU (U2) LCD power supply failure signal input end, and the other end of the capacitor C112 is connected with power ground.

4. An instrument display device for facilitating installation as defined in claim 2, wherein: the working voltage input end of the optical sensor U13 is connected with the voltage output end of the voltage stabilizer U1, one end of the capacitor C148 and one end of the capacitor C149, the other end of the capacitor C148 and the other end of the capacitor C149 are connected with power ground, the reference resistance end of the optical sensor U13 is connected with one end of the resistor R141, the other end of the resistor R141 and the grounding end of the optical sensor U13 are both connected with power ground, the signal output end of the optical sensor U13 is connected with one end of the resistor R142 and one end of the resistor R54, the other end of the resistor R142 is connected with the light detection signal input end of the MCU (U2), the clock end of the optical sensor U13 is connected with the light sensing clock signal end of the MCU (U2) and one end of the resistor R55, the data end of the optical sensor U13 is connected with one end of the MCU (U2) light sensing data signal end of the resistor R146, and one end of the resistor R54, one end of the resistor R55 and the other end of the resistor R146 are both connected with the voltage output end of the voltage stabilizer U1;

The CAN bus connection circuit comprises a CAN transceiver U8 working voltage input end, a CAN power supply chip U9 voltage output end and a capacitor C120 end, wherein the other end of the capacitor C120 is connected with power ground, the low-level end of the CAN transceiver U8 is connected with a filter L14 third end and a resistor R82 end, the other end of the resistor R82 is connected with a filter L14 second end, and the other end of the resistor R82 is connected with a first wiring row P1 seventh end; the high-level end of the CAN transceiver U8 is connected with the fourth end of the filter L14 and one end of a resistor R88, the other end of the resistor R88 is connected with the first end of the filter L14, the other end of the resistor R88 is connected with the sixth end of the first wiring row P1, the seventh end and the sixth end of the first wiring row P1 are connected with an automobile CAN bus, the other end of the R88 is connected with one end of a resistor R86, one end of a capacitor C123 and the first end of an ESD (electro-static discharge) suppressor ESD7, the other end of the resistor R86 is connected with one end of a capacitor C122 and one end of a resistor R84, the other end of the resistor R84 is connected with the other end of the resistor R82, the other end of the resistor R82 is also connected with one end of a capacitor C121, and the other end of the capacitor C121 and the other end of the capacitor C123 of the capacitor C122 are both connected with power ground;

the CAN transceiver U8 transmitting end is connected with one end of a resistor R83, the other end of the resistor R83 is connected with the MCU (U2) CAN signal transmitting end, the receiving end of the CAN transceiver U8 is connected with one end of a resistor R85, the other end of the resistor R85 is connected with the MCU (U2) CAN signal receiving end, the standby end of the CAN transceiver U8 is connected with one end of a resistor R87 and the MCU (U2) CAN standby end, and the other end of the resistor R87 and the CAN transceiver grounding end are both connected with the power ground.