A control method of a high-brightness two-wheeled vehicle display module and a display module

Abstract

This invention discloses a control method and display module for a high-brightness two-wheeled vehicle display module, relating to the field of electronic technology. The method includes: predicting the LED light source junction temperature after a preset time period based on the current ambient temperature, backlight drive current, PWM duty cycle, LED forward voltage drop, and preset RC thermal network parameters output by a temperature sampling unit; acquiring the power supply ripple amplitude and communication bit error rate output by the filter protection circuit and flexible circuit board in real time; assessing the current electromagnetic interference level based on the power supply ripple amplitude and communication bit error rate; generating a backlight drive current control signal and / or a PWM duty cycle control signal based on the comparison between the current electromagnetic interference level, the predicted LED light source junction temperature, and a preset junction temperature threshold; and controlling the backlight drive chip based on the backlight drive current control signal and / or the PWM duty cycle control signal. This invention achieves a dynamic balance between anti-interference and thermal stability.

Description

Technical Field

[0001] This invention relates to the field of electronic technology, and in particular to a control method and display module for a high-brightness two-wheeled vehicle display module. Background Technology

[0002] Two-wheeled vehicle displays are typically installed in the handlebar and instrument panel areas or exposed areas of the vehicle body. Their operating environment is extremely harsh, requiring long-term stable operation under direct sunlight, drastic temperature changes, high-intensity vehicle vibration, battery power fluctuations, and complex electromagnetic conditions. Compared to consumer indoor displays or enclosed automotive cockpit displays, two-wheeled vehicle display modules face more stringent and contradictory technical challenges: Firstly, to ensure visibility in strong sunlight such as at midday, the display module must possess extremely high brightness, typically exceeding 1000 cd / m². However, continuous high brightness output generates significant heat loss, causing a sharp rise in LED junction temperature and driver chip temperature, leading to brightness decay, color shift, and even reaching material limits, resulting in a blackout. Existing technology typically uses simple NTC thermistors for temperature measurement, drastically reducing the backlight current when the surface temperature reaches a threshold. This "cliff-like" passive thermal protection can cause riders to momentarily lose sight of critical information such as speed under strong light, posing a serious safety hazard. Secondly, the electrical space of two-wheeled vehicles is extremely compact, with the display module typically located adjacent to the motor controller, high-power power converter, and battery management system (BMS). High-power inverters generate strong common-mode and differential-mode electromagnetic interference (EMI) during operation, easily leading to screen distortion, flickering, or communication errors. Existing technologies mainly rely on passive physical isolation methods such as adding shielding covers and conductive adhesives, but passive isolation not only increases weight and cost but also has limited ability to suppress low-frequency magnetic fields and high-frequency spikes. Thirdly, at the drive control level, there is an inherent contradiction between the slew rate of the backlight driver chip's switching signal and electromagnetic interference and heat generation: the steeper the rising / falling edge of the switching signal, the lower the switching loss and heat generation, but the greater the high-frequency electromagnetic radiation generated; conversely, the gentler the slope, the lower the EMI, but the switching loss increases dramatically, and the chip heats up severely. Existing two-wheeled vehicle displays typically use fixed drive parameters, making it impossible to achieve a balance between "thermodynamic heating" and "electromagnetic interference."

[0003] Therefore, this application develops a control method and display module for a high-brightness two-wheeled vehicle display module to solve the above problems. Summary of the Invention

[0004] This invention proposes a control method and display module for a high-brightness two-wheeled vehicle display module to solve the problem that existing technologies cannot achieve a dynamic balance between anti-interference and thermal stability.

[0005] The present invention achieves the above objectives through the following technical solutions: This invention discloses a high-brightness two-wheeled vehicle display module control method, characterized in that it includes: The system acquires the current ambient temperature output by the temperature sampling unit, the backlight drive current of the backlight driver chip, the PWM duty cycle of the high-brightness backlight component, and the LED forward voltage drop of the LED light source. Based on the current ambient temperature, backlight drive current, PWM duty cycle, LED forward voltage drop, and preset RC thermal network parameters output by the temperature sampling unit, the estimated junction temperature of the LED light source is predicted after a preset time based on the thermal response model. The power supply ripple amplitude and communication bit error rate output by the filter protection circuit and flexible circuit board are acquired in real time, and the current electromagnetic interference level is assessed based on the power supply ripple amplitude and communication bit error rate. Based on the current electromagnetic interference level and the comparison between the estimated junction temperature of the LED light source and the preset junction temperature threshold, a backlight drive current control signal and / or PWM duty cycle control signal are generated. The backlight driver chip is controlled according to the backlight drive current control signal and / or PWM duty cycle control signal.

[0006] Furthermore, the preset RC thermal network parameters include the equivalent thermal resistance and equivalent heat capacity between the LED light source and the environment, and the thermal response model is a first-order or multi-order RC thermal network prediction model.

[0007] Furthermore, the power supply ripple amplitude and communication bit error rate output by the filter protection circuit and flexible circuit board are acquired in real time. The current electromagnetic interference level is assessed based on the power supply ripple amplitude and communication bit error rate, including: When the power supply ripple amplitude is lower than the first ripple threshold and the communication bit error rate is lower than the first bit error rate threshold, it is judged as a low interference level. When the power supply ripple amplitude exceeds the second ripple threshold or the communication bit error rate exceeds the second bit error rate threshold, it is judged as a high interference level. All other cases are classified as medium interference level.

[0008] Furthermore, based on the current electromagnetic interference level and the estimated junction temperature of the LED light source, a backlight drive current control signal and / or PWM duty cycle control signal are generated, including: When the electromagnetic interference level is determined to be high interference level, the gate drive resistance of the external MOSFET of the backlight driver chip is increased, the gate charging and discharging current is reduced, or the slope control register inside the backlight driver chip is adjusted to prolong the rise time and / or fall time of the switching node voltage, thereby slowing down the rise and / or fall slope of the switching signal to suppress high frequency radiation. When the electromagnetic interference level is low and the estimated junction temperature of the LED is higher than the preset junction temperature threshold, the rise time and / or fall time of the switching node voltage can be shortened by reducing the gate drive resistance of the external MOSFET, increasing the gate charging current and / or discharge current, or adjusting the slope control register inside the backlight driver chip, thereby steepening the slope of the rising edge and / or falling edge of the switching signal of the backlight driver chip to reduce the switching heat loss of the driver chip.

[0009] Furthermore, when the electromagnetic interference level is high, while maintaining the current target brightness parameters unchanged, the rising and / or falling edge slopes of the switching signal of the backlight driver chip are dynamically adjusted, and / or the backlight driver chip is controlled to switch to dynamic spread spectrum mode. The dynamic spread spectrum mode refers to controlling the switching frequency of the backlight driver chip to change periodically or pseudo-randomly near the center frequency according to a preset spread spectrum amplitude, so as to disperse the electromagnetic interference energy.

[0010] Furthermore, 6. The high-brightness two-wheeled vehicle display module control method according to claim 5 is characterized in that, when the brightness control unit actively switches to the dynamic spread spectrum mode, the brightness control unit acquires the ripple sampling signal output by the filter protection circuit through the analog-to-digital conversion port, and calculates the power supply ripple frequency through zero-crossing detection or fast Fourier transform; the brightness control unit determines the spread spectrum modulation frequency according to its own output spread spectrum control parameters or by reading the frequency register of the backlight driver chip; the brightness control unit determines the refresh frequency of the display panel by reading the refresh rate register of the display driver chip or by detecting the TE / VSYNC signal of the display panel, that is, when the power supply ripple frequency or the spread spectrum modulation frequency is detected to beat with the refresh frequency of the display panel, resulting in water ripples, the refresh rate of the display panel is dynamically adjusted. The new frame rate ensures that the period of the spread spectrum modulation frequency and the refresh frame rate are integer multiples of each other to eliminate visual flicker and water ripples. The power supply ripple frequency refers to the main frequency of the periodic ripple component in the power supply voltage of the display module; the spread spectrum modulation frequency refers to the modulation frequency of the backlight driver switching frequency changing around the center frequency in dynamic spread spectrum mode; the refresh frame rate refers to the number of image frames refreshed by the display panel per unit time. The power supply ripple frequency can be obtained by sampling the ripple signal output by the sampling node of the filter protection circuit, and then by the brightness control unit performing zero-crossing detection or spectrum analysis after ADC sampling; the spread spectrum modulation frequency is a parameter set by the brightness control unit itself or read from the backlight driver chip register; the display panel refresh frequency can be obtained from the display driver chip register, the TE signal, or the VSYNC signal.

[0011] Furthermore, after controlling the backlight driver chip according to the backlight drive current control signal and / or PWM duty cycle control signal, the method further includes calling a preset Gamma lookup table or adjusting the Gamma register parameters of the display driver chip according to the decreasing ratio of the backlight drive current and / or PWM duty cycle.

[0012] Furthermore, based on the decrease ratio of the backlight drive current and / or PWM duty cycle, a preset Gamma lookup table is invoked or the Gamma register parameters of the display driver chip are adjusted, including: When the estimated junction temperature of the LED exceeds the warning threshold but is lower than the protection threshold, the delay damping time of brightness adjustment is extended, that is, the ramp time for the backlight drive current and / or PWM duty cycle to transition from the current value to the target derating value is extended, so that the physical brightness of the backlight actively decreases according to the preset smooth derating curve; at the same time, the display panel is subjected to reverse linkage compensation, that is, according to the decrease ratio of the backlight drive current and / or PWM duty cycle, the preset Gamma lookup table is called or the Gamma register parameters of the display driver chip are adjusted to improve the pixel transmittance or display contrast in the mid-to-high grayscale area, thereby compensating for the visual brightness loss caused by the decrease in physical brightness. When the measured temperature exceeds the preset protection threshold, the control display module switches to global thermal protection mode. The global thermal protection mode means that when the measured temperature collected by the temperature sampling unit exceeds the protection threshold, the brightness control unit limits the backlight drive current to below the preset safe current, limits the PWM duty cycle to below the preset safe duty cycle, and turns off or reduces the display brightness of non-critical information areas, retaining only the display of critical information such as vehicle speed, fault alarm, battery level, and turn prompts.

[0013] Furthermore, when the estimated junction temperature exceeds the warning threshold, predictive smoothing heat derating control is implemented. This predictive smoothing heat derating control includes: When the ambient light intensity collected by the ambient light sensor is greater than the preset strong light threshold and continues for more than the preset time, it is determined to be a strong sunlight environment. The preset strong light threshold is in the range of 30,000 lx to 80,000 lx. When in a strong sunlight environment and the estimated junction temperature of the LED exceeds the warning threshold, the pixel drive and backlight power of the non-critical information area of ​​the display panel are turned off or reduced, and the heat is transferred to the critical information area. The non-critical information area includes decorative backgrounds, dynamic animations, brand logos, ambient lighting effects, border patterns, and low-priority menu areas in the display interface; the critical information area includes at least one of vehicle speed, fault alarms, battery level, steering prompts, and driving mode prompts.

[0014] The present invention also provides a high-brightness two-wheeled vehicle display module, comprising: The input terminal includes a temperature sampling unit, a filter protection circuit, a flexible circuit board, and an ambient light sensor; The decision-making end includes a brightness control unit, the input of which is connected to a temperature sampling unit, a filter protection circuit, a flexible circuit board, and an ambient light sensor. The output end includes a high-brightness backlight assembly and a display panel. The output end of the brightness control unit is connected to the high-brightness backlight assembly and the display panel respectively. The high-brightness backlight assembly is disposed on the back side of the display panel and includes an LED light source. A brightness control unit is used to output a backlight drive current control signal and / or a PWM duty cycle control signal according to the control method described in claims 1-9. A driving circuit board is connected to the display panel. The driving circuit board includes a backlight driving chip. The output terminal of the brightness control unit is connected to the input terminal of the backlight driving chip, and the output terminal is connected to the high-brightness backlight assembly. The backlight driving chip is used to drive the LED light source according to the backlight driving current control signal and / or PWM duty cycle control signal output by the brightness control unit. A shielded grounding structure is provided, in which the flexible circuit board and the driving circuit board are connected. A heat diffusion structure is disposed in the heat-generating area of ​​the high-brightness backlight assembly and the driver circuit board.

[0015] The beneficial effects of this invention are as follows: The high-brightness two-wheeled vehicle display module and its control method proposed in this invention can achieve a dynamic balance between anti-interference and thermal stability by breaking through physical hardware limitations through underlying control algorithms while ensuring high outdoor visibility. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the hardware structure and control architecture of the high-brightness two-wheeled vehicle display module of the present invention; Figure 2 This is a flowchart of the thermal-optical-electric three-dimensional linkage predictive control algorithm of the present invention; Figure 3 This is a flowchart of the electromagnetic environment perception and adaptive drive closed-loop control of the present invention.

[0017] In the diagram: 1-Display panel, 2-High-brightness backlight assembly, 3-Driver circuit board, 4-Flexible circuit board, 5-Shielding grounding structure, 6-Filtering protection circuit, 7-Heat diffusion structure, 8-Temperature sampling unit, 9-Brightness control unit. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] like Figure 1 As shown, the high-brightness two-wheeled vehicle display module provided in this embodiment includes a display panel 1, a high-brightness backlight assembly 2, a driving circuit board 3, a flexible circuit board 4, a shielding grounding structure 5, a filtering protection circuit 6, a heat diffusion structure 7, a temperature sampling unit 8, and a brightness control unit 9.

[0024] To meet the high-brightness requirements of outdoor use in two-wheeled vehicles, the peak brightness of the high-brightness backlight assembly 2 is designed to exceed 1000 cd / m². To handle this extremely high power density, the underlying hardware first incorporates a heat dissipation structure 7, including a graphite heat sink, a high thermal conductivity silicone pad (above 3.0 W / mK), and an aluminum alloy back shell, as well as a filter protection circuit 6 and a shielded grounding structure 5, including a grounding via enclosure and an independent return path. However, passive hardware alone cannot handle extreme operating conditions. The core of this embodiment lies in the configuration of the brightness control unit 9. This control unit not only receives signals from a conventional ambient light sensor and the surface temperature measured by the temperature sampling unit 8, but also reads in real time the "power supply ripple amplitude" extracted by the filter protection circuit 6 and the "bit error rate (BER)" on the communication interface, using them as an "electromagnetic environment sensing probe."

[0025] This embodiment provides a high-brightness two-wheeled vehicle display module, specifically comprising: The input terminal includes a temperature sampling unit 8, a filter protection circuit 6, a flexible circuit board 4, and an ambient light sensor. The temperature sampling unit 8 includes a temperature sensor and a sampling circuit connected to the temperature sensor. The decision-making end includes a brightness control unit 9, whose input terminal is connected to a temperature sampling unit 8, a filter protection circuit 6, a flexible circuit board 4, and an ambient light sensor, respectively. The output end includes a high-brightness backlight assembly 2 and a display panel 1. The output end of the brightness control unit 9 is connected to the high-brightness backlight assembly 2 and the display panel 1 respectively. The high-brightness backlight assembly 2 is disposed on the back side of the display panel 1. Brightness control unit 9, the brightness control unit is used to output a backlight drive current control signal and / or a PWM duty cycle control signal according to the control method described above; The driving circuit board 3 is connected to the display panel 1. The driving circuit board 3 includes a backlight driving chip. The output terminal of the brightness control unit is connected to the input terminal of the backlight driving chip, and the output terminal is connected to the high-brightness backlight assembly 2. The backlight driving chip is used to drive the LED light source according to the backlight driving current control signal and / or PWM duty cycle control signal output by the brightness control unit. The flexible circuit board 4 and the driving circuit board 3 are connected through the shielding grounding structure 5; A heat diffusion structure 7 is disposed in the heat-generating areas of the high-brightness backlight assembly 2 and the drive circuit board 3.

[0026] The aforementioned temperature acquisition unit includes a temperature sensor and its sampling circuit, which is used to acquire the ambient temperature of the display module and / or the local temperature of the high-brightness backlight component and the driving circuit board, and output the acquired temperature information to the brightness control unit. The filtering protection circuit is used to output the power supply ripple amplitude to the brightness control unit. The flexible circuit board includes a high-speed clock line, a data signal line, a power line and a ground line, which is used to output the communication error rate according to the communication link. The ambient light sensor acquires the ambient light intensity of the external environment of the display module and outputs the ambient light intensity to the brightness control unit.

[0027] A high-brightness backlight assembly is disposed on the back side of the display panel and is used to provide backlight illumination to the display panel. It includes an LED light source, a light guide structure and / or a reflective cavity, a reflective sheet, a diffuser sheet, and a brightness enhancement film. The LED light source is connected to the backlight driver chip and generates backlight under the drive of the backlight driver chip according to the backlight drive current control signal and / or PWM duty cycle control signal output by the brightness control unit. A driver circuit board is connected to the display panel, and a backlight driver chip is mounted on the driver circuit board. The input terminal of the backlight driver chip is connected to the brightness control unit, and its output terminal is connected to the LED light source in the high-brightness backlight assembly. It is used to drive the LED light source according to the backlight drive current control signal and / or PWM duty cycle control signal output by the brightness control unit. The shielded grounding structure includes a grounding copper foil layer, a grounding protection wire, a grounding via, shielding tape, conductive foam, and / or a grounding connector connected to a metal mounting bracket. It is disposed on the flexible circuit board and / or the drive circuit board and connected to the ground terminal of the drive circuit board. It is used to electromagnetically shield high-speed clock lines, data signal lines, and power lines in the flexible circuit board, and to discharge electromagnetic interference current coupled to the flexible circuit board to the drive circuit board ground, module housing ground, or vehicle ground, thereby reducing display signal errors, display flicker, and electromagnetic radiation. A heat diffusion structure is disposed in the heat-generating areas of the high-brightness backlight assembly and the driver circuit board. It includes a thermally conductive silicone layer and a metal mounting bracket. The thermally conductive silicone layer fills the gap between the heat-generating area and the metal heat-conducting plate or metal mounting bracket. The metal mounting bracket serves both to support and fix the display module and as an auxiliary heat dissipation component to reduce the temperature rise of the high-brightness backlight assembly and the driver circuit board.

[0028] like Figure 2 and Figure 3 As shown, the present invention provides a high-brightness two-wheeled vehicle display module control method, comprising: The system acquires the current ambient temperature output by the temperature sampling unit, the backlight drive current of the backlight driver chip, the PWM duty cycle of the high-brightness backlight component, and the LED forward voltage drop of the LED light source. Based on the current ambient temperature, backlight drive current, PWM duty cycle, LED forward voltage drop, and preset RC thermal network parameters output by the temperature sampling unit, the estimated junction temperature of the LED light source is predicted after a preset time based on the thermal response model. The power supply ripple amplitude and communication bit error rate output by the filter protection circuit and flexible circuit board are acquired in real time, and the current electromagnetic interference level is assessed based on the power supply ripple amplitude and communication bit error rate. Based on the current electromagnetic interference level and the comparison between the estimated junction temperature of the LED light source and the preset junction temperature threshold, a backlight drive current control signal and / or PWM duty cycle control signal are generated. The backlight driver chip is controlled according to the backlight drive current control signal and / or PWM duty cycle control signal.

[0029] In one embodiment, the preset RC thermal network parameters include the equivalent thermal resistance and equivalent heat capacity between the LED light source and the environment, and the thermal response model is a first-order or multi-order RC thermal network prediction model.

[0030] In one embodiment, the power supply ripple amplitude and communication bit error rate output by the filter protection circuit and the flexible circuit board are acquired in real time, and the current electromagnetic interference level is assessed based on the power supply ripple amplitude and communication bit error rate, including: When the power supply ripple amplitude is lower than the first ripple threshold and the communication bit error rate is lower than the first bit error rate threshold, it is judged as a low interference level. When the power supply ripple amplitude exceeds the second ripple threshold or the communication bit error rate exceeds the second bit error rate threshold, it is judged as a high interference level. All other cases are classified as medium interference level.

[0031] In one embodiment, based on the current electromagnetic interference level and the estimated junction temperature of the LED light source, a backlight drive current control signal and / or a PWM duty cycle control signal are generated, including: When the electromagnetic interference level is determined to be high interference level, the gate drive resistance of the external MOSFET of the backlight driver chip is increased, the gate charging and discharging current is reduced, or the slope control register inside the backlight driver chip is adjusted to prolong the rise time and / or fall time of the switching node voltage, thereby slowing down the rise and / or fall slope of the switching signal to suppress high frequency radiation. When the electromagnetic interference level is low and the estimated junction temperature of the LED is higher than the preset junction temperature threshold, the rise time and / or fall time of the switching node voltage can be shortened by reducing the gate drive resistance of the external MOSFET, increasing the gate charging current and / or discharge current, or adjusting the slope control register inside the backlight driver chip, thereby steepening the slope of the rising edge and / or falling edge of the switching signal of the backlight driver chip to reduce the switching heat loss of the driver chip.

[0032] In one embodiment, when the electromagnetic interference level is high, while keeping the current target brightness parameter unchanged, the rising edge and / or falling edge slope of the switching signal of the backlight driver chip is dynamically adjusted, and / or the backlight driver chip is controlled to switch to dynamic spread spectrum mode. The dynamic spread spectrum mode refers to controlling the switching frequency of the backlight driver chip to change periodically or pseudo-randomly near the center frequency according to a preset spread spectrum amplitude, so as to disperse the electromagnetic interference energy.

[0033] Furthermore, when the brightness control unit actively switches to dynamic spread spectrum mode, it acquires the ripple sampling signal output by the filter protection circuit through the analog-to-digital converter port and calculates the power supply ripple frequency through zero-crossing detection or fast Fourier transform. The brightness control unit determines the spread spectrum modulation frequency based on its own output spread spectrum control parameters or by reading the frequency register of the backlight driver chip. The brightness control unit determines the display panel refresh rate by reading the refresh rate register of the display driver chip or by detecting the TE / VSYNC signal of the display panel. Specifically, when it detects a beat between the power supply ripple frequency or the spread spectrum modulation frequency and the display panel refresh rate, resulting in a water ripple effect, it dynamically adjusts the refresh rate of the display panel to ensure that the spread spectrum modulation frequency and refresh rate are in sync. The period must satisfy an integer multiple relationship to eliminate visual flicker and water ripples. The power supply ripple frequency refers to the main frequency of the periodic ripple component in the power supply voltage of the display module; the spread spectrum modulation frequency refers to the modulation frequency of the backlight driver switching frequency changing around the center frequency in dynamic spread spectrum mode; the refresh rate refers to the number of times the display panel refreshes image frames per unit time. The power supply ripple frequency can be obtained by sampling the ripple signal output by the sampling node of the filter protection circuit, and then by the brightness control unit performing zero-crossing detection or spectrum analysis after ADC sampling; the spread spectrum modulation frequency is a parameter set by the brightness control unit itself or read from the backlight driver chip register; the display panel refresh rate can be obtained from the display driver chip register, the TE signal, or the VSYNC signal.

[0034] In one embodiment, after controlling the backlight driver chip according to the backlight drive current control signal and / or PWM duty cycle control signal, the method further includes calling a preset Gamma lookup table or adjusting the Gamma register parameters of the display driver chip according to the decrease ratio of the backlight drive current and / or PWM duty cycle.

[0035] In one embodiment, calling a preset Gamma lookup table or adjusting the Gamma register parameters of the display driver chip according to the decrease ratio of the backlight drive current and / or PWM duty cycle includes: When the estimated junction temperature of the LED exceeds the warning threshold but is lower than the protection threshold, the delay damping time of brightness adjustment is extended, that is, the ramp time for the backlight drive current and / or PWM duty cycle to transition from the current value to the target derating value is extended, so that the physical brightness of the backlight actively decreases according to the preset smooth derating curve; at the same time, the display panel is subjected to reverse linkage compensation, that is, according to the decrease ratio of the backlight drive current and / or PWM duty cycle, the preset Gamma lookup table is called or the Gamma register parameters of the display driver chip are adjusted to improve the pixel transmittance or display contrast in the mid-to-high grayscale area, thereby compensating for the visual brightness loss caused by the decrease in physical brightness. When the measured temperature exceeds the preset protection threshold, the control display module switches to global thermal protection mode. The global thermal protection mode means that when the measured temperature collected by the temperature sampling unit exceeds the protection threshold, the brightness control unit limits the backlight drive current to below the preset safe current, limits the PWM duty cycle to below the preset safe duty cycle, and turns off or reduces the display brightness of non-critical information areas, retaining only the display of critical information such as vehicle speed, fault alarm, battery level, and turn prompts.

[0036] In one embodiment, predictive smoothing thermal derating control is performed when the estimated junction temperature exceeds a warning threshold. The predictive smoothing thermal derating control includes: When the ambient light intensity collected by the ambient light sensor is greater than the preset strong light threshold and continues for more than the preset time, it is determined to be a strong sunlight environment. The preset strong light threshold is in the range of 30,000 lx to 80,000 lx. When in a strong sunlight environment and the estimated junction temperature of the LED exceeds the warning threshold, the pixel drive and backlight power of the non-critical information area of ​​the display panel are turned off or reduced, and the heat is transferred to the critical information area. The non-critical information area includes decorative backgrounds, dynamic animations, brand logos, ambient lighting effects, border patterns, and low-priority menu areas in the display interface; the critical information area includes at least one of vehicle speed, fault alarms, battery level, steering prompts, and driving mode prompts.

[0037] In one embodiment, when a beat frequency is detected between the power supply ripple frequency or the spread spectrum modulation frequency and the display refresh rate, the display refresh rate is adjusted so that it satisfies a preset integer multiple relationship with the spread spectrum modulation frequency or avoids the beat frequency range.

[0038] In existing technologies, predictive smooth thermal derating control based on a thermal response model typically uses an NTC thermistor to measure the circuit board temperature, and directly reduces the brightness by half once it exceeds 85°C. However, the brightness control unit 9 in this embodiment incorporates a thermal response model. Because the actual junction temperature of the LED's light-emitting area T...j Unable to be measured directly, the system uses the formula: T j =T env +R th_LED ×(V f ×I LED -P opt ); Among them, T j T is the junction temperature of the LED light source; env The current ambient temperature or the internal reference temperature of the module, obtained by the temperature sampling unit; R th_LED V is the equivalent thermal resistance between the LED light source and the environment. f I is the forward voltage drop of the light-emitting diode; LED This is the drive current output from the backlight driver chip to the LED light source; P opt This refers to the optical power converted by the light-emitting diode into light output.

[0039] Iterative calculations are performed using an RC thermal network. Within each control cycle, the brightness control unit first calculates the current backlight thermal power Pheat, and then uses the estimated junction temperature T from the previous cycle. j (k) Probably calculate the junction temperature T for the next cycle j (k+1). For a first-order RC heat network, the following recursive relationship can be used: T j (k+1)=T env +(T j (k)-T env )×e -Δt / τ +R th ×P heat ×(1-e -Δt / τ ), where Δt is the control period and τ is the equivalent thermal time constant. After N iterations, the estimated junction temperature is obtained after a preset time. When the system operates under full brightness in direct outdoor sunlight, and the thermal model predicts that the junction temperature will reach the dangerous red line of 125℃ within the next 30 seconds, a predictive smoothing derating is triggered: 1. The system does not immediately cut off or halve the current, but smoothly weakens the drive current in a very small step per second. It actively reduces the backlight drive current and / or pulse width modulation duty cycle with a preset smooth derating curve, so that the human eye cannot perceive the instantaneous brightness change.

[0040] 2. Synchronous call to the visual Gamma parameter inversion compensation of the display driver: Although the physical brightness of the backlight is slightly reduced, the system increases the pixel contrast at the LCD panel end, making the white speedometer numbers on the instrument panel appear sharper.

[0041] 3. Initiate local heat transfer: The system identifies the current UI interface and turns off the backlight of unnecessary decorative halo areas, thereby "giving" limited heat dissipation quota to the core vehicle speed display area, ensuring that key data is always at the highest brightness without increasing overall heat generation.

[0042] The dynamic slope of electromagnetic interference and spread-spectrum closed-loop adaptive control: When a two-wheeled vehicle accelerates rapidly or climbs a hill, the motor controller releases a large amount of spatially radiated and conducted ripple with high dv / dt and di / dt noise. When the brightness control unit 9 senses a sharp increase in power supply ripple or the communication bit error rate (BER) exceeds the first threshold, it determines that the vehicle is under severe electromagnetic conditions. At this time, the following adaptive strategy is executed: 1. Dynamic Slope Softening: When driving the backlight MOSFET, actively increasing the gate drive resistance or decreasing the drive current softens the rising and falling edges of the switching waveform. The softened edges significantly reduce high-frequency harmonic emissions and lower EMI. The trade-off is a slight increase in MOSFET switching heat.

[0043] 2. When interference disappears or temperature is too high: If the vehicle's operating conditions are stable, or if the thermal model predicts that the current system is overloaded and facing thermal breakdown, the brightness control unit 9 will immediately steepen the switching slope. At this time, although the EMI base will rise slightly, the MOSFET is out of the high-loss linear region, and the heat generation drops sharply, thus saving thermal runaway.

[0044] 3. Dynamic Spread Spectrum and Waterproof Ripple: In the event of strong common-mode interference in a specific frequency band, the system activates dynamic spread spectrum, allowing the backlight PWM base frequency to fluctuate within ±3%. This overcomes the technical bias of conventional spread spectrum causing ripple effects on the LCD screen. The control unit simultaneously fine-tunes the panel's refresh rate. According to the formula t=k×(1 / FMOD), where t is the frame time, FMOD is the spread spectrum modulation frequency, and k is an integer, the spread spectrum period is strictly synchronized with the screen refresh rate as an integer multiple, thus fundamentally eliminating visual flicker caused by frequency offset.

[0045] The beneficial effects of this invention are as follows: 1. Generating cross-dimensional synergy and breaking conventional technical biases: This invention abandons the passive approach of "hardware stacking" in existing technologies, integrating anti-interference electromagnetic compatibility and heat management into the same closed-loop control system. By utilizing dynamic slope adjustment, it actively sacrifices some heat dissipation to suppress interference in harsh environments, and improves efficiency and reduces heat generation in favorable environments, achieving system-level optimization where "1+1>2". 2. Predictive thermal control enhances riding safety: By calculating the invisible internal LED junction temperature rather than the surface temperature using an RC thermal network model, it achieves "pre-emptive prediction" rather than "post-accident cliff-like protection." Combined with smooth damping algorithms, Gamma compensation, and local heat transfer strategies, it completely solves the safety hazards caused by frequent brightening or dimming of LEDs in environments with intense light and heat alternation, such as tree-lined roads and direct sunlight. 3. Completely solves the side effects of adaptive anti-interference: While it is well known in the industry that Spread Spectrum Modulation (SSC) technology can reduce EMI, it is very easy to cause "beat frequency ripples" on the LCD screen. This invention perfectly overcomes this technical bias by dynamically synchronizing the backlight's spread spectrum modulation frequency with the panel's image refresh rate using an integer multiple of phase / frequency. This suppresses radiation throughout the vehicle while ensuring visual purity.

[0046] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-brightness two-wheeler display module control method, characterized by, include: The system acquires the current ambient temperature output by the temperature sampling unit, the backlight drive current of the backlight driver chip, the PWM duty cycle of the high-brightness backlight component, and the LED forward voltage drop of the LED light source. Based on the current ambient temperature, backlight drive current, PWM duty cycle, LED forward voltage drop, and preset RC thermal network parameters output by the temperature sampling unit, the estimated junction temperature of the LED light source is predicted after a preset time based on the thermal response model. The power supply ripple amplitude and communication bit error rate output by the filter protection circuit and flexible circuit board are acquired in real time, and the current electromagnetic interference level is assessed based on the power supply ripple amplitude and communication bit error rate. Based on the current electromagnetic interference level and the comparison between the estimated junction temperature of the LED light source and the preset junction temperature threshold, a backlight drive current control signal and / or PWM duty cycle control signal are generated. The backlight driver chip is controlled according to the backlight drive current control signal and / or PWM duty cycle control signal.

2. The high-brightness two-wheeler display module control method according to claim 1, characterized in that, The preset RC thermal network parameters include the equivalent thermal resistance and equivalent heat capacity between the LED light source and the environment, and the thermal response model is a first-order or multi-order RC thermal network prediction model.

3. The high-brightness two-wheeled vehicle display module control method according to claim 1, characterized in that, The power supply ripple amplitude and communication bit error rate output from the filter protection circuit and flexible circuit board are acquired in real time. Based on the power supply ripple amplitude and communication bit error rate, the current electromagnetic interference level is assessed, including: When the power supply ripple amplitude is lower than the first ripple threshold and the communication bit error rate is lower than the first bit error rate threshold, it is judged as a low interference level. When the power supply ripple amplitude exceeds the second ripple threshold or the communication bit error rate exceeds the second bit error rate threshold, it is judged as a high interference level. All other cases are classified as medium interference level.

4. The high-brightness two-wheeled vehicle display module control method according to claim 3, characterized in that, Based on the current electromagnetic interference level and the estimated junction temperature of the LED light source, generate backlight drive current control signals and / or PWM duty cycle control signals, including: When the electromagnetic interference level is determined to be high interference level, the gate drive resistance of the external MOSFET of the backlight driver chip is increased, the gate charging and discharging current is reduced, or the slope control register inside the backlight driver chip is adjusted to prolong the rise time and / or fall time of the switching node voltage, thereby slowing down the rise and / or fall slope of the switching signal to suppress high frequency radiation. When the electromagnetic interference level is low and the estimated junction temperature of the LED is higher than the preset junction temperature threshold, the rise time and / or fall time of the switching node voltage can be shortened by reducing the gate drive resistance of the external MOSFET, increasing the gate charging current and / or discharge current, or adjusting the slope control register inside the backlight driver chip, thereby steepening the slope of the rising edge and / or falling edge of the switching signal of the backlight driver chip to reduce the switching heat loss of the driver chip.

5. The high-brightness two-wheeled vehicle display module control method according to claim 4, characterized in that, When the electromagnetic interference level is high, while keeping the current target brightness parameters unchanged, the rising and / or falling edge slope of the switching signal of the backlight driver chip is dynamically adjusted, and / or the backlight driver chip is controlled to switch to dynamic spread spectrum mode. The dynamic spread spectrum mode refers to controlling the switching frequency of the backlight driver chip to change periodically or pseudo-randomly around the center frequency according to a preset spread spectrum amplitude, so as to disperse the electromagnetic interference energy.

6. The high-brightness two-wheeled vehicle display module control method according to claim 5, characterized in that, When the brightness control unit actively switches to dynamic spread spectrum mode, the brightness control unit acquires the ripple sampling signal output by the filter protection circuit through the analog-to-digital conversion port, and calculates the power supply ripple frequency through zero-crossing detection or fast Fourier transform; the brightness control unit determines the spread spectrum modulation frequency based on its own output spread spectrum control parameters or by reading the frequency register of the backlight driver chip. The brightness control unit determines the display panel refresh rate by reading the refresh rate register of the display driver chip or detecting the TE / VSYNC signal of the display panel. Specifically, when it detects that the power supply ripple frequency or the spread spectrum modulation frequency beats with the display panel refresh rate, causing water ripples, it dynamically adjusts the refresh rate of the display panel to ensure that the period of the spread spectrum modulation frequency and the refresh rate are integer multiples of each other, thereby eliminating visual flicker and water ripples. Here, the power supply ripple frequency refers to the main frequency of the periodic ripple component in the power supply voltage of the display module; the spread spectrum modulation frequency refers to the modulation frequency of the backlight driver switching frequency changing around the center frequency in dynamic spread spectrum mode; and the refresh rate refers to the number of image frames refreshed by the display panel per unit time.

7. The high-brightness two-wheeled vehicle display module control method according to claim 1, characterized in that, After controlling the backlight driver chip according to the backlight drive current control signal and / or PWM duty cycle control signal, the method further includes calling a preset Gamma lookup table or adjusting the Gamma register parameters of the display driver chip according to the decreasing ratio of the backlight drive current and / or PWM duty cycle.

8. The high-brightness two-wheeled vehicle display module control method according to claim 7, characterized in that, The display driver chip's Gamma register parameters are adjusted based on the decrease ratio of the backlight drive current and / or PWM duty cycle, including calling a preset Gamma lookup table or adjusting the Gamma lookup table. When the estimated junction temperature of the LED exceeds the warning threshold but is lower than the protection threshold, the delay damping time of brightness adjustment is extended, that is, the ramp time for the backlight drive current and / or PWM duty cycle to transition from the current value to the target derating value is extended, so that the physical brightness of the backlight actively decreases according to the preset smooth derating curve; at the same time, the display panel is subjected to reverse linkage compensation, that is, according to the decrease ratio of the backlight drive current and / or PWM duty cycle, the preset Gamma lookup table is called or the Gamma register parameters of the display driver chip are adjusted to improve the pixel transmittance or display contrast in the mid-to-high grayscale area, thereby compensating for the visual brightness loss caused by the decrease in physical brightness. When the measured temperature exceeds the preset protection threshold, the control display module switches to global thermal protection mode. The global thermal protection mode means that when the measured temperature collected by the temperature sampling unit exceeds the protection threshold, the brightness control unit limits the backlight drive current to below the preset safe current, limits the PWM duty cycle to below the preset safe duty cycle, and turns off or reduces the display brightness of non-critical information areas, retaining only the display of critical information such as vehicle speed, fault alarm, battery level, and turn prompts.

9. The control method for a high-brightness two-wheeled vehicle display module according to claim 1, characterized in that, When the estimated junction temperature exceeds the warning threshold, predictive smoothing heat derating control is implemented. Predictive smoothing heat derating control includes: When the ambient light intensity collected by the ambient light sensor is greater than the preset strong light threshold and continues for more than the preset time, it is determined to be a strong sunlight environment. The preset strong light threshold is in the range of 30,000 lx to 80,000 lx. When in a strong sunlight environment and the estimated junction temperature of the LED exceeds the warning threshold, the pixel drive and backlight power of the non-critical information area of ​​the display panel are turned off or reduced, and the heat is transferred to the critical information area. The non-critical information area includes decorative backgrounds, dynamic animations, brand logos, ambient lighting effects, border patterns, and low-priority menu areas in the display interface; the critical information area includes at least one of vehicle speed, fault alarms, battery level, steering prompts, and driving mode prompts.

10. A high-brightness display module for a two-wheeled vehicle, characterized in that, include: The input terminal includes a temperature sampling unit, a filter protection circuit, a flexible circuit board, and an ambient light sensor; The decision-making end includes a brightness control unit, the input of which is connected to a temperature sampling unit, a filter protection circuit, a flexible circuit board, and an ambient light sensor. The output end includes a high-brightness backlight assembly and a display panel. The output end of the brightness control unit is connected to the high-brightness backlight assembly and the display panel respectively. The high-brightness backlight assembly is disposed on the back side of the display panel and includes an LED light source. A brightness control unit is used to output a backlight drive current control signal and / or a PWM duty cycle control signal according to the control method described in claims 1-9. A driving circuit board is connected to the display panel. The driving circuit board includes a backlight driving chip. The output terminal of the brightness control unit is connected to the input terminal of the backlight driving chip, and the output terminal is connected to the high-brightness backlight assembly. The backlight driving chip is used to drive the LED light source according to the backlight driving current control signal and / or PWM duty cycle control signal output by the brightness control unit. A shielded grounding structure is provided, in which the flexible circuit board and the driving circuit board are connected. A heat diffusion structure is disposed in the heat-generating area of ​​the high-brightness backlight assembly and the driver circuit board.

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