Vehicle-mounted display screen integrated structure and control method thereof

Abstract

The application discloses a kind of vehicle-mounted display screen integrated structure and its control method, including display screen component, the display screen component includes the cover plate, liquid crystal panel and backlight module being sequentially stacked in thickness direction, the integrated rear cover is set to the back of the display screen component, the integrated rear cover is formed with the display screen component between accommodating space, the integrated circuit board component is set in the accommodating space.This application integrates liquid crystal screen drive circuit board component and vehicle interface circuit board component into the same integrated circuit board component, and realizes the unified communication management of each functional module and main control MCU through I2C bus, cancels the board-to-board connector or flexible flat cable between the original two circuit boards, reduces signal transmission loss and connection failure point, the number of circuit board components is reduced from two to one, the development cycle is shortened by more than 30%, hardware material cost is reduced by more than 20%, production line assembly process is reduced by two, and production capacity is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of automotive display application technology, and in particular to an integrated structure for an automotive display screen and its control method. Background Technology

[0002] With the rapid development of automotive intelligence and electrification, in-vehicle displays have become the core interface for human-machine interaction in modern automobiles, widely used in scenarios such as instrument clusters, central navigation, passenger entertainment, and rear armrest controls. Currently, the mass production solutions for in-vehicle display assemblies generally adopt a collaborative model between LCD screen manufacturers and Tier 1 automotive component suppliers: LCD screen manufacturers are responsible for providing the T-LCM (Touch Display Module) assembly, which includes the LCD panel, backlight module, printed circuit board assembly for driving the LCD display IC, and magnesium-aluminum alloy back cover; Tier 1 manufacturers, based on the T-LCM assembly, separately design printed circuit board assemblies for interfacing with the vehicle, the back cover, and brackets, etc., to complete the final product delivery to the OEM. This division of labor model has gradually solidified in the industry's development, forming a relatively stable supply chain system.

[0003] However, the aforementioned existing technical solutions have significant technical defects and industry pain points. First, the same display product requires two independent printed circuit board assemblies: one for driving the LCD screen, and the other for interfacing with the vehicle's power and communication interfaces. These two circuit boards need to be connected via board-to-board connectors or flexible cables, which not only increases hardware material costs but also introduces additional signal transmission losses and potential failure points due to the inter-board connection. Furthermore, since the two circuit boards are designed and developed by different manufacturers, there is redundant design and verification, leading to extended development cycles and wasted R&D resources. Second, the magnesium-aluminum alloy back cover of the LCD screen assembly and the back cover designed by the Tier 1 supplier respectively serve the functions of screen protection and overall system protection. The two back covers have overlapping and redundant structures and functions, increasing the overall thickness, weight, and mold costs of the product, which is detrimental to the industry trend of thinner and lighter automotive displays. Third, in the existing separate design, the temperature sensor signal on the LCD panel needs to be transferred from the LCD manufacturer's circuit board to the Tier 1 manufacturer's circuit board via a connector. This results in a long signal link and multiple transfer points, making it difficult to achieve efficient real-time temperature compensation and affecting the image quality stability of the display across the entire temperature range. In addition, the production line needs to assemble the two circuit board assemblies and install the two back covers separately. This involves many assembly steps, low production efficiency, and a large number of components and connection interfaces, making it difficult to further improve the overall quality stability. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an integrated structure for an in-vehicle display screen and a control method thereof, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide an integrated structure for an in-vehicle display screen, including a display screen assembly, the display screen assembly including a cover plate, a liquid crystal panel and a backlight module stacked sequentially along the thickness direction, the integrated back cover being disposed on the back of the display screen assembly, the integrated back cover and the display screen assembly forming an accommodating space, the integrated circuit board assembly being disposed in the accommodating space, and the integrated circuit board assembly integrating a display screen driving circuit and a vehicle interface circuit;

[0006] The display screen driving circuit is electrically connected to the display IC of the liquid crystal panel and is used to drive the liquid crystal panel to display images;

[0007] The vehicle interface circuit is used for communication and docking with the vehicle control system.

[0008] The present invention is further configured such that: the integrated circuit board assembly also integrates an LED backlight driving circuit and an analog-to-digital conversion circuit, wherein the LED backlight driving circuit is electrically connected to the LED light strip of the backlight module and is used to drive the backlight module to emit light;

[0009] The analog-to-digital conversion circuit is electrically connected to the temperature sensor disposed on the liquid crystal panel, and is used to collect the temperature signal of the liquid crystal panel and transmit it to the main control chip via the I2C bus.

[0010] Through the above technical solution, the integrated circuit board assembly integrates the display driving circuit, vehicle interface circuit, LED backlight driving circuit and analog-to-digital conversion circuit on the same circuit board, eliminating the original board-to-board connector or flexible cable between the LCD screen driving board and the vehicle interface board, shortening the signal transmission path, and reducing signal loss and connection failure risk.

[0011] Meanwhile, the temperature sensor signal can be directly sampled by the analog-to-digital conversion circuit without going through a connector, reducing the conversion links in the signal link, improving the real-time performance and accuracy of temperature sampling, and providing a reliable data foundation for subsequent temperature compensation control.

[0012] The present invention is further configured such that: the integrated circuit board assembly also integrates a power input protection circuit, the power input protection circuit including a reverse connection protection circuit and a transient voltage suppression circuit, which is used to receive the B+ power supplied by the vehicle battery and perform protection processing before supplying power to the integrated circuit board assembly.

[0013] Through the above technical solution, the power input protection circuit is set on the integrated circuit board assembly. The B+ power supplied by the vehicle battery is protected for polarity by the reverse connection protection circuit and suppressed for surge by the transient voltage suppression circuit, and then outputs a stable DC power supply to power the various functional modules on the integrated circuit board assembly.

[0014] The present invention is further configured such that: the integrated circuit board assembly integrates an LCD high-voltage driving circuit, the LCD high-voltage driving circuit including a boost converter and a charge pump, for converting the input power supply into a VGH gate turn-on voltage and a VGL gate turn-off voltage and outputting them to the gate driving circuit of the liquid crystal panel.

[0015] Through the above technical solution, the LCD high-voltage driving circuit boosts the input power supply to VGH gate turn-on voltage via a boost converter and outputs it to the gate driving circuit of the LCD panel to control the turn-on of the TFT thin-film transistors; it converts the input power supply to VGL gate turn-off voltage via a charge pump and outputs it to the gate driving circuit of the LCD panel to control the turn-off of the TFT thin-film transistors; this circuit receives configuration instructions from the main control MCU via the I2C bus to realize dynamic adjustment of the output voltage, so that VGH and VGL can be compensated in real time according to temperature changes, avoiding display defects caused by changes in TFT switching characteristics due to temperature drift.

[0016] The present invention is further configured such that: the integrated circuit board assembly integrates a bias power management circuit with a timing controller, the bias power management circuit receives configuration instructions from the main control chip via an I2C bus, and provides the timing controller with programmable core voltage and bias voltage.

[0017] Through the above technical solution, the bias power management circuit provides a stable core operating voltage and bias voltage for the timing controller, and accepts real-time configuration from the main control MCU through the I2C bus, ensuring that the timing controller can generate accurate gate drive timing and data drive timing.

[0018] This circuit, together with the LCD high-voltage drive circuit, constitutes a complete LCD screen drive power supply solution. It integrates the T-Con power supply system, which was originally designed independently by the LCD screen manufacturer, with the vehicle interface system designed by the manufacturer, onto the same circuit board, realizing unified planning and management of the screen drive power supply and the vehicle interface power supply.

[0019] The present invention is further configured such that: the integrated back cover is an integrated magnesium-aluminum alloy back cover, and the integrated back cover serves as both the back cover of the LCD panel and the outer shell back cover of the entire device.

[0020] Through the above technical solution, the integrated back cover adopts a one-piece molded structure of magnesium-aluminum alloy. Its inner side supports the installation and fixation of the integrated circuit board assembly, while its outer side serves as the appearance surface of the whole machine and is assembled with the vehicle's dashboard or center console. This integrated back cover replaces the original two separate parts, the LCD screen back cover and the whole machine back cover, eliminating the fitting gap and assembly tolerance accumulation between the two back covers, reducing the overall thickness by the wall thickness of one back cover. At the same time, the magnesium-aluminum alloy material has good heat dissipation performance, which can effectively conduct and dissipate the heat generated by the power devices on the integrated circuit board assembly.

[0021] The present invention is further configured such that: a middle frame is provided between the display screen assembly and the integrated back cover, the middle frame being used to fix the liquid crystal panel and the backlight module.

[0022] With the above technical solution, the middle frame is set between the display panel and the integrated back cover, and a positioning structure is set on its inner side to fix the relative positions of the LCD panel and the backlight module respectively, so as to ensure the alignment accuracy between the two; a receiving space is formed between the middle frame and the integrated back cover, and the integrated circuit board assembly is installed in the receiving space. The middle frame plays a role in positioning and limiting the integrated circuit board assembly.

[0023] On the other hand, a control method for an integrated structure of an in-vehicle display screen is provided, including the following steps;

[0024] S1. Receives B+ power from the vehicle battery through the power input protection circuit, and supplies power to the integrated circuit board assembly after protection processing;

[0025] S2. The input power supply is boosted and converted into VGH gate turn-on voltage and VGL gate turn-off voltage by the LCD high voltage driving circuit, and then output to the gate driving circuit of the LCD panel.

[0026] S3. The input power is boosted and output to the LED strip of the backlight module through the LED backlight driver circuit to drive the backlight module to emit light.

[0027] S4. The temperature signal from the temperature sensor on the LCD panel is acquired through the analog-to-digital conversion circuit and transmitted to the main control MCU via the I2C bus;

[0028] S5. The main control MCU sends a configuration command to the LCD high-voltage drive circuit via the I2C bus according to the temperature signal, and adjusts the output values ​​of VGH gate turn-on voltage and / or VGL gate turn-off voltage to perform temperature compensation on the LCD panel.

[0029] The present invention is further configured such that: in step S5, when the main control MCU adjusts the VGH gate turn-on voltage and / or VGL gate turn-off voltage according to the temperature signal, it performs linear interpolation calculation according to the preset temperature-voltage compensation curve to determine the target output voltage value.

[0030] Through the above technical solution, the main control MCU has a temperature-voltage compensation curve pre-stored in its internal memory. When the main control MCU obtains the current temperature value, it performs linear interpolation calculation on the compensation curve with the temperature value as the independent variable to obtain the target VGH and VGL voltage values ​​at the current temperature. Then, it writes the values ​​to the register of the LCD high voltage drive circuit via the I2C bus to perform output adjustment. This interpolation calculation method is simple to implement, has a small computational load, and controllable accuracy. It does not require external storage chips or complex algorithms, and reduces the resource consumption of the main control MCU while ensuring compensation accuracy.

[0031] The beneficial effects of this invention are as follows:

[0032] 1. The present invention proposes an integrated structure and control method for an in-vehicle display screen. By integrating the LCD screen driving circuit board assembly and the vehicle interface circuit board assembly into a single integrated circuit board assembly, and realizing unified communication management between each functional module and the main control MCU through the I2C bus, the original board-to-board connector or flexible cable between the two circuit boards is eliminated, reducing signal transmission loss and connection failure points. The number of circuit board assemblies is reduced from two to one, the development cycle is shortened by more than 30%, the hardware material cost is reduced by more than 20%, the assembly process on the production line is reduced by two steps, and the production capacity is significantly improved.

[0033] 2. The present invention proposes an integrated structure and control method for an in-vehicle display screen. By integrating the LCD screen back cover and the overall back cover into a single magnesium-aluminum alloy integrated back cover, the integrated back cover serves as both the back cover of the LCD panel and the outer shell back cover of the entire device. This eliminates the gaps and accumulated assembly tolerances between the two back covers, reducing the overall thickness by the wall thickness of one back cover, thus achieving a thinner and lighter design. Furthermore, the excellent heat dissipation properties of magnesium-aluminum alloy effectively conduct and dissipate the heat generated by the power devices on the integrated circuit board assembly, while reducing the number of molds and the overall assembly cost.

[0034] 3. The integrated structure and control method for an in-vehicle display screen proposed in this invention directly connects the temperature sensor signal on the LCD panel to the analog-to-digital converter circuit on the integrated circuit board assembly. The main control MCU performs linear interpolation calculations according to a preset temperature-voltage compensation curve, and then dynamically adjusts the VGH gate turn-on voltage and VGL gate turn-off voltage output by the LCD high-voltage drive circuit via the I2C bus. This achieves real-time closed-loop temperature compensation across the entire temperature range, avoiding color shift, contrast reduction, and response delay caused by changes in TFT switching characteristics due to temperature drift. This ensures consistent image quality and display stability over a wide temperature range of -40℃ to 85℃. Attached Figure Description

[0035] Figure 1 This is a first structural diagram of the present invention;

[0036] Figure 2 This is a second structural diagram of the present invention;

[0037] Figure 3 This is a first exploded view of the present invention;

[0038] Figure 4 This is the second exploded view of the present invention;

[0039] Figure 5 This is a first structural diagram of the integrated back cover in this invention;

[0040] Figure 6 This is a second structural diagram of the integrated back cover in this invention;

[0041] Figure 7 This is a circuit schematic diagram of the integrated circuit board assembly in this invention;

[0042] Figure 8 This is the LCD high-voltage driving circuit module in this invention;

[0043] Figure 9 This is the vehicle power input and protection circuit module in this invention;

[0044] Figure 10 This is the main control and T-Con bias power supply circuit module in this invention;

[0045] Figure 11 This is the LED backlight driving circuit module in this invention;

[0046] Figure 12 This is the analog-to-digital conversion acquisition circuit module in this invention.

[0047] In the diagram: 1. Cover plate; 2. LCD panel; 3. Backlight module; 4. Mid-frame; 5. Integrated circuit board assembly; 6. Integrated back cover. Detailed Implementation

[0048] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0049] like Figures 1-6 As shown, an integrated structure for an in-vehicle display screen includes a display screen assembly. The display screen assembly includes a cover plate 1, a liquid crystal panel 2, and a backlight module 3 stacked sequentially along the thickness direction. An integrated back cover 6 is disposed on the back of the display screen assembly, and an accommodating space is formed between the integrated back cover 6 and the display screen assembly.

[0050] The cover plate 1 is made of tempered glass, and its inner surface is bonded and fixed to the upper surface of the liquid crystal panel 2 with optical transparent adhesive. The liquid crystal panel 2 is a TFT-LCD liquid crystal display panel, and its back side is set opposite to the light-emitting surface of the backlight module 3. The backlight module 3 is bonded and fixed to the back side of the liquid crystal panel 2 to provide a uniform surface light source for the liquid crystal panel 2.

[0051] The integrated back cover 6 is an integrated magnesium-aluminum alloy back cover. The integrated back cover 6 serves as both the back cover of the LCD panel 2 and the outer shell back cover of the entire machine. The integrated back cover 6 adopts an integrated magnesium-aluminum alloy molding structure. Its inner side supports the installation and fixation of the integrated circuit board assembly 5, and its outer side serves as the appearance surface of the entire machine, which is assembled with the vehicle's dashboard or center console. This integrated back cover replaces the original two separate parts, the LCD screen back cover and the entire machine back cover, eliminating the fitting gap and assembly tolerance accumulation between the two back covers, reducing the overall thickness by the wall thickness of one back cover. At the same time, the magnesium-aluminum alloy material has good heat dissipation performance, which can effectively conduct and dissipate the heat generated by the power devices on the integrated circuit board assembly 5.

[0052] A middle frame 4 is also provided between the display assembly and the integrated back cover 6. The middle frame 4 is used to fix the LCD panel 2 and the backlight module 3. The middle frame 4 is located between the display assembly and the integrated back cover 6. The middle frame 4 has a positioning structure on its inner side to fix the relative positions of the LCD panel 2 and the backlight module 3 respectively, so as to ensure the alignment accuracy between the two. The middle frame 4 is made by injection molding. The middle frame 4 has a positioning groove and a buckle structure on its inner side. The LCD panel 2 and the backlight module 3 are respectively embedded in the corresponding positioning groove and fixed by buckles. An accommodating space is formed between the middle frame 4 and the integrated back cover 6. The integrated circuit board assembly 5 is installed in the accommodating space. The middle frame 4 plays a positioning and limiting role for the integrated circuit board assembly 5. The middle frame 4 is fixedly connected to the integrated back cover 6 by screws. A sealing gasket is provided between the periphery of the middle frame 4 and the periphery of the integrated back cover 6 to achieve waterproof and dustproof sealing.

[0053] like Figures 7-12 As shown, the integrated circuit board assembly 5 is disposed within the accommodating space, and the integrated circuit board assembly 5 integrates the display screen driving circuit and the vehicle interface circuit.

[0054] The display driving circuit is electrically connected to the display IC of the LCD panel 2 and is used to drive the LCD panel 2 to display images. The vehicle interface circuit is used to communicate with the vehicle control system. The vehicle interface circuit is equipped with a CAN bus interface and a LIN bus interface connected to the vehicle control system to realize data communication between the display screen and the vehicle.

[0055] The integrated circuit board assembly 5 also integrates an LED backlight driving circuit and an analog-to-digital conversion circuit. The LED backlight driving circuit is electrically connected to the LED light strip of the backlight module 3 and is used to drive the backlight module 3 to emit light.

[0056] The analog-to-digital conversion circuit is electrically connected to the temperature sensor set on the LCD panel 2, which is used to collect the temperature signal of the LCD panel 2 and transmit it to the main control chip via the I2C bus. The integrated circuit board assembly 5 integrates the display driving circuit, the vehicle interface circuit, the LED backlight driving circuit and the analog-to-digital conversion circuit on the same circuit board, eliminating the original board-to-board connector or flexible cable between the LCD screen driving board and the vehicle interface board, shortening the signal transmission path, and reducing signal loss and connection failure risk.

[0057] Meanwhile, the temperature sensor signal can be directly sampled by the analog-to-digital conversion circuit without going through a connector, reducing the conversion links in the signal link, improving the real-time performance and accuracy of temperature sampling, and providing a reliable data foundation for subsequent temperature compensation control.

[0058] The integrated circuit board assembly 5 also integrates a power input protection circuit, which includes a reverse connection protection circuit and a transient voltage suppression circuit. It is used to receive the B+ power supplied by the vehicle battery and perform protection processing before supplying power to the integrated circuit board assembly 5. The power input protection circuit is set on the integrated circuit board assembly 5. The B+ power supplied by the vehicle battery is protected for polarity by the reverse connection protection circuit and suppressed for surge by the transient voltage suppression circuit, and then outputs a stable DC power supply to power the various functional modules on the integrated circuit board assembly 5.

[0059] The input terminal of the power input protection circuit is connected to the B+ power line of the vehicle battery via an automotive-grade connector, with an input voltage range of 6.5V-18V. The reverse connection protection circuit uses an ideal diode circuit composed of an S3M-E367T diode and a MOSFET Q3. When the positive and negative terminals of the power supply are reversed, the MOSFET does not conduct, blocking the reverse current path. The transient voltage suppression circuit uses a PESD12VL1BA TVS diode connected in parallel at the input terminal to suppress transient surge pulses on the vehicle power system. The output terminal is connected in parallel with an energy storage filter network composed of multiple 100μF high-capacity capacitors, combined with a 100nF high-frequency decoupling capacitor, to form a wideband filter network, ensuring that the output P_BAT power ripple voltage is below 50mV.

[0060] The integrated circuit board assembly 5 integrates an LCD high-voltage driving circuit, which includes a boost converter and a charge pump. This circuit converts the input power supply into VGH gate-on voltage and VGL gate-off voltage and outputs them to the gate driving circuit of the LCD panel 2. The boost converter boosts the input power supply to VGH gate-on voltage, which is then output to the gate driving circuit of the LCD panel 2 to control the on-state of the TFT thin-film transistors. The charge pump converts the input power supply to VGL gate-off voltage, which is then output to the gate driving circuit of the LCD panel 2 to control the off-state of the TFT thin-film transistors. This circuit receives configuration commands from the main control MCU via the I2C bus to dynamically adjust the output voltage, enabling VGH and VGL to be compensated in real time according to temperature changes, thus avoiding display defects caused by changes in TFT switching characteristics due to temperature drift.

[0061] The LCD high-voltage driving circuit uses the RTQ6749-QT automotive-grade programmable power management chip U5, whose input is connected to the P_BAT power supply. This chip integrates two synchronous boost converters for PAVDD and VGH, one synchronous NAVDD buck-boost converter, a VGL charge pump, a high-performance VCOM generation circuit with an 8-bit calibrator, and a reset voltage detector. A 10μH power inductor is externally connected to the LX pin for boost energy storage, and a charge pump capacitor is externally connected to the CPP pin for VGL negative voltage generation. The chip outputs a 6.3V analog power supply voltage for PAVDD, a 16V gate turn-on voltage for VGH, a -14V gate turn-off voltage for VGL, and a VCOM common electrode voltage to the corresponding driving terminals of the LCD panel 2. The chip communicates with the main control MCU via an I2C bus (SDA / SCL), with a 7-bit I2C address of 0x38.

[0062] The integrated circuit board assembly 5 integrates a bias power management circuit for a timing controller. The bias power management circuit receives configuration instructions from the main control chip via the I2C bus, provides programmable core voltage and bias voltage for the timing controller, provides stable core operating voltage and bias voltage for the timing controller, and receives real-time configuration from the main control MCU via the I2C bus, ensuring that the timing controller can generate accurate gate drive timing and data drive timing.

[0063] The bias power management circuit uses a highly integrated bias power management chip U2 with an input power of Pmax: 12V 1A. The input terminal is connected to the P_BAT power supply. The chip's BST pin is connected to an external boost capacitor, and the LX1 pin is connected to an external power inductor, forming a Boost converter to provide the AVDD voltage to the Source Driver. The BIAS and BIASP pins are the feedback terminals for the output positive and negative bias voltages, used to generate the VCOM common electrode voltage and the reference source for VGH / VGL. The chip accepts configuration commands from the main control MCU via the I2C bus and outputs multiple programmable voltages, including the Vcore core voltage provided to the core processor, the BIAS bias voltage provided to the timing controller, and the AVDD voltage provided to the Source Driver.

[0064] This circuit, together with the LCD high-voltage drive circuit, constitutes a complete LCD screen drive power supply solution. It integrates the T-Con power supply system, which was originally designed independently by the LCD screen manufacturer, with the vehicle interface system designed by the manufacturer, onto the same circuit board, realizing unified planning and management of the screen drive power supply and the vehicle interface power supply.

[0065] The integrated circuit board assembly (5) also integrates an LED backlight driving circuit using an LP8684SQHRQ1 automotive-grade LED driver chip U3. Its input terminal is connected to the P_BAT power supply, and its enable terminal BL_EN is connected to the GPIO port of the main control MCU. The dimming control terminal receives the PWM pulse width modulation signal PWM_FSET from the main control MCU to set the backlight dimming frequency. The LX terminal of the chip is connected to an external 2.2μH power inductor L12 to build a Boost topology, which boosts the P_BAT voltage to 23V and outputs it to the LED light strip of the backlight module 3 in a constant current manner through internal multi-channel constant current sources. The chip communicates with the main control MCU through the I2C bus. The 7-bit I2C address is 0x3A and the 8-bit I2C address is 0x74. It supports digital dimming, fault reading, and mode switching functions.

[0066] The integrated circuit board assembly 5 also integrates an analog-to-digital conversion (ADC) acquisition circuit using an ADS1015BQDGSRQ1 automotive-grade 12-bit analog-to-digital converter chip U4. This chip has four analog signal input terminals AN0-AN3. The AN0 channel is connected to the NTC temperature sensor LCD_NTC on the LCD panel 2 via a resistor divider network to acquire the panel temperature signal. The AN1 channel is connected to the touchscreen analog signal output terminal LCD_TS_ANA to acquire touch position or pressure sensing signals. The AN2 channel is connected to the power supply voltage monitoring terminal INANA_B+ to monitor the voltage status of the P_BAT power rail. The AN3 channel is connected to the hardware version identification terminal Version_DET, which identifies the current hardware version by reading the unique voltage value output by the voltage divider resistor network soldered on different PCB versions. This chip connects to the I2C bus (7-bit I2C address is 0x49, 8-bit I2C address is 0x49). The I2C address is 0x92. The converted digital value is reported to the main control MCU. At the signal input terminal, there is also an emitter follower buffer circuit composed of Q4 (MBT5401LT1G, PNP type transistor) and Q6 (MBT5551LT1G, NPN type transistor) for impedance matching and overvoltage protection.

[0067] like Figures 1-12 As shown, a control method for an integrated structure of an in-vehicle display screen includes the following steps;

[0068] S1. Receives B+ power from the vehicle battery through the power input protection circuit, and supplies power to the integrated circuit board assembly 5 after protection processing.

[0069] S2. The input power supply is boosted and converted into VGH gate turn-on voltage and VGL gate turn-off voltage by the LCD high voltage driving circuit, and then output to the gate driving circuit of the LCD panel.

[0070] S3. The input power is boosted and output to the LED strip of the backlight module through the LED backlight driver circuit to drive the backlight module to emit light.

[0071] S4. The temperature signal from the temperature sensor on the LCD panel is acquired through the analog-to-digital conversion circuit and transmitted to the main control MCU via the I2C bus;

[0072] S5. The main control MCU sends a configuration command to the LCD high-voltage drive circuit through the I2C bus according to the temperature signal, and adjusts the output values ​​of VGH gate turn-on voltage and / or VGL gate turn-off voltage to perform temperature compensation for the LCD panel.

[0073] The above steps S1 is the starting step and is executed before all other steps; S2 and S3 are executed synchronously after S1 is completed and the P_BAT power supply is stably outputting; S4 is continuously executed in a loop with a sampling period of 100ms after the system is powered on; the execution of S5 depends on the temperature data collected by S4, and the temperature compensation judgment and execution of S5 are triggered once after each data reporting by S4.

[0074] In step S5, when the main control MCU adjusts the VGH gate turn-on voltage and / or VGL gate turn-off voltage according to the temperature signal, it performs linear interpolation calculation according to the preset temperature-voltage compensation curve to determine the target output voltage value. The main control MCU has a temperature-voltage compensation curve that has been experimentally calibrated. When the main control MCU obtains the current temperature value, it performs linear interpolation calculation on the compensation curve with the temperature value as the independent variable to obtain the target VGH and VGL voltage values ​​at the current temperature. Then, it writes the values ​​to the register of the LCD high-voltage drive circuit through the I2C bus to perform output adjustment. This interpolation calculation method is simple to implement, has a small computational load, and controllable accuracy. It does not require external storage chips or complex algorithms, and reduces the resource consumption of the main control MCU while ensuring compensation accuracy.

[0075] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An integrated structure for a vehicle-mounted display screen, characterized in that, include: The display assembly includes a cover plate (1), a liquid crystal panel (2) and a backlight module (3) stacked sequentially along the thickness direction. An integrated back cover (6) is disposed on the back of the display assembly, and an accommodating space is formed between the integrated back cover (6) and the display assembly; An integrated circuit board assembly (5) is disposed within the accommodating space, and the integrated circuit board assembly (5) integrates a display screen driving circuit and a vehicle interface circuit; The display screen driving circuit is electrically connected to the display IC of the liquid crystal panel (2) and is used to drive the liquid crystal panel (2) to display images; The vehicle interface circuit is used for communication and docking with the vehicle control system.

2. The vehicle-mounted display screen integrated structure according to claim 1, characterized in that, The integrated circuit board assembly (5) also integrates an LED backlight driving circuit and an analog-to-digital conversion circuit. The LED backlight driving circuit is electrically connected to the LED light strip of the backlight module (3) and is used to drive the backlight module (3) to emit light. The analog-to-digital conversion circuit is electrically connected to the temperature sensor disposed on the liquid crystal panel (2) and is used to collect the temperature signal of the liquid crystal panel (2) and transmit it to the main control chip via the I2C bus.

3. The vehicle-mounted display screen integrated structure according to claim 1, characterized in that, The integrated circuit board assembly (5) also integrates a power input protection circuit, which includes a reverse connection protection circuit and a transient voltage suppression circuit. It is used to receive the B+ power supplied by the vehicle battery and perform protection processing before supplying power to the integrated circuit board assembly (5).

4. The vehicle-mounted display screen integrated structure according to claim 1, characterized in that, The integrated circuit board assembly (5) integrates an LCD high voltage driving circuit, which includes a boost converter and a charge pump, for converting the input power supply into VGH gate turn-on voltage and VGL gate turn-off voltage and outputting them to the gate driving circuit of the liquid crystal panel (2).

5. The vehicle-mounted display screen integrated structure according to claim 1, characterized in that, The integrated circuit board assembly (5) integrates a bias power management circuit with a timing controller. The bias power management circuit receives configuration instructions from the main control chip via the I2C bus and provides programmable core voltage and bias voltage for the timing controller.

6. The vehicle-mounted display screen integrated structure according to claim 1, characterized in that, The integrated back cover (6) is an integrated magnesium-aluminum alloy back cover, which serves as both the back cover of the LCD panel (2) and the outer shell back cover of the entire machine.

7. The vehicle-mounted display screen integrated structure according to claim 1, characterized in that, A middle frame (4) is also provided between the display assembly and the integrated back cover (6), and the middle frame (4) is used to fix the liquid crystal panel (2) and the backlight module (3).

8. A control method for an integrated structure of a vehicle-mounted display screen according to any one of claims 1-7, characterized in that: Includes the following steps; S1. The B+ power supply provided by the vehicle battery is received through the power input protection circuit and then used to power the integrated circuit board assembly (5) after protection processing. S2. The input power supply is boosted and converted into VGH gate turn-on voltage and VGL gate turn-off voltage by the LCD high voltage driving circuit, and then output to the gate driving circuit of the LCD panel. S3. The input power is boosted and output to the LED strip of the backlight module through the LED backlight driver circuit to drive the backlight module to emit light. S4. The temperature signal from the temperature sensor on the LCD panel is acquired through the analog-to-digital conversion circuit and transmitted to the main control MCU via the I2C bus; S5. The main control MCU sends a configuration command to the LCD high-voltage drive circuit via the I2C bus according to the temperature signal, and adjusts the output values ​​of VGH gate turn-on voltage and / or VGL gate turn-off voltage to perform temperature compensation on the LCD panel.

9. The control method according to claim 8, characterized in that, In step S5, when the main control MCU adjusts the VGH gate turn-on voltage and / or VGL gate turn-off voltage according to the temperature signal, it performs linear interpolation calculation according to the preset temperature-voltage compensation curve to determine the target output voltage value.

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