A red and yellow LED-based image display technology for car interaction screens

Abstract

The application discloses a kind of based on red and yellow LED's car interactive screen image display technology, it is related to car interactive screen technical field, and the core of this technology contains three modules: one is double-channel LED array construction module, to red yellow channel integrated LED as basic unit construction display screen array, synchronous production high heat-conducting substrate and anti-interference signal line, lay hardware foundation;Two are image signal preprocessing and parameter calculation module, after interactive screen starts, receive vehicle external image data, combine vehicle environment and state real-time data, divide functional area and set target brightness, while analyzing the brightness ratio and PWM duty cycle of each LED pixel;Three are dynamic driving display control module, brightness ratio and PWM duty cycle are sent to LED driving chip, it can also analyze scene dynamic adjustment parameter, and based on real-time substrate temperature, current, voltage assess whether to start hardware protection mechanism, realize the cooperation of display, energy saving and hardware protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile interactive screen, and particularly relates to an automobile interactive screen image display technology based on red and yellow LEDs. BACKGROUND

[0002] With the rapid development of automobile electronic technology, the demand for automobile interactive screens as an important part of the vehicle information system is increasing. Traditional automobile interactive screens usually use red LEDs for display, which can only provide simple image effects, and brightness and display effect have become a bottleneck restricting their application. Therefore, how to use dual-color and efficient LED display technology, taking into account the visual effect and power consumption of the image, has become a problem that needs to be solved in the industry.

[0003] The prior art, such as the invention patent application with the announcement number CN113330395B, discloses a multi-screen interaction method, device, terminal equipment and vehicle, and relates to the technical field of intelligent vehicles. After detecting that the image captured by the camera includes a specific gesture, the content displayed on the first display screen at this time is converted into a sub-image, and the identification of other display screens that can display the sub-image and the orientation information relative to the first display screen are displayed on the first display screen. The user can intuitively see the moving direction of the subsequent gesture, and then according to the moving direction of the specific gesture, the second display screen is determined, and the sub-image is controlled to move on the first display screen along with the movement of the specific gesture. When it is monitored that the distance of the specific gesture movement is greater than the set threshold, the sub-image is moved to the second display screen, thereby realizing the multi-screen interaction function.

[0004] For the above-mentioned scheme, the present application applicant found that the above-mentioned technology at least has the following technical problems: 1. The current mainstream LED-based automobile interactive screen image display technology exposes many drawbacks in the hardware construction link, and needs to be innovated. When the display screen array is built, the LED chips selected by the common LED automobile interactive screen often have the problem of large brightness deviation between batches, which is far beyond the ideal range of 5%, causing poor screen display uniformity. At the same time, in terms of high thermal conductivity substrate, the thermal conductivity coefficient of traditional materials is often difficult to reach 200W / (m·K), and when facing the large amount of heat generated by the continuous high load work of the LED, the heat dissipation efficiency is low, which accelerates the aging of the LED lamp beads and shortens the service life of the screen. The anti-interference signal line also has many problems, such as unreasonable etching width, insufficient protection ability of the insulation layer, and no high-performance EMC filter, and the complex electromagnetic environment in vehicle driving can easily interfere with signal transmission, causing the display picture to flicker, have a flower screen, or even information loss.

[0005] 2、Current technology in the image signal processing and display parameter setting stage, the existing technology also shows obvious lag. When the car starts, the interactive screen receives external image data and real-time data of vehicle environment and state, and the setting of the target brightness of each functional area lacks precision and dynamic adaptability. It can usually only adjust the brightness according to the two variables of simple light intensity and vehicle speed, without fully considering other key factors such as vehicle bumping degree, driving mode switching, etc. For example, in the scene of high-speed driving and bumpy road, the brightness of the warning information cannot be further improved to ensure that the driver can timely perceive. When analyzing the brightness ratio and PWM duty cycle of the LED pixels in each functional area, the existing technology mostly uses fixed calculation logic, without flexible adjustment combined with image content characteristics and real-time power consumption demand, resulting in that when displaying complex images or the vehicle power is low, it cannot guarantee the display quality while realizing high efficiency and energy saving.

[0006] 3、Current technology in the dynamic driving display control process, on the one hand, when transmitting brightness ratio and PWM duty cycle data to the LED driving chip, the stability and timeliness of data transmission cannot be guaranteed, and display stuttering and color distortion may be caused by transmission delay or interruption. On the other hand, the analysis ability of scene dynamic adjustment parameters is limited, and it is difficult to accurately identify different scenes such as static, dynamic and key information. In static scenes, it is difficult to reduce power consumption effectively, causing energy waste; in dynamic scenes, it cannot quickly optimize the display effect, resulting in blurred dynamic pictures and serious trailing; in the face of key information scenes, it is difficult to strengthen the display in an instant, affecting the speed and accuracy of the driver's acquisition of important information. Moreover, when evaluating whether to start the hardware protection mechanism, the monitoring index is single and the threshold setting is unreasonable, which cannot comprehensively and timely protect the hardware state of the interactive screen. Once the hardware appears overheating, overcurrent and other abnormalities, it is easy to cause permanent damage. SUMMARY

[0007] In view of the above technical deficiencies, the purpose of the present application is to provide a kind of based on red and yellow LED's car interactive screen image display technology.

[0008] To solve the above technical problems, the technical scheme adopted by the present application is as follows: the present application provides a kind of based on red and yellow LED's car interactive screen image display technology, including: double-channel LED array construction module: for integrated red channel and yellow channel LED as basic unit, the display screen array of target car interactive screen is constructed, and the high thermal conductivity substrate manufacturing and anti-interference signal line design of target car interactive screen are completed synchronously.

[0009] The image signal preprocessing and parameter calculation module is used for receiving external image data of the target automobile interactive screen vehicle-mounted system at the current time when the target automobile interactive screen is started, and combining with the obtained real-time data of the target automobile vehicle environment and state to set the target brightness corresponding to each functional area of the target automobile interactive screen, and analyze the brightness ratio and PWM duty cycle corresponding to each LED pixel point in each functional area of the target automobile interactive screen.

[0010] The dynamic driving display control module is used for sending the brightness ratio and PWM duty cycle corresponding to each LED pixel point in each functional area of the target automobile interactive screen to the LED driving chip, and simultaneously analyzing the scene dynamic adjustment parameters corresponding to the target automobile interactive screen, and then evaluating whether the hardware protection mechanism of the target automobile interactive screen is started.

[0011] The beneficial effects of the present application are as follows: 1. The embodiment of the present application has achieved a significant breakthrough in hardware reliability and display effect optimization, effectively solving the core pain points of the existing LED interactive screen, such as poor heat dissipation, weak anti-interference, and uneven display. At the hardware level, by using red / yellow dual-channel integrated LED chips, combined with a metal-based composite material substrate with a thermal conductivity of ≥200 W / (m·K) and a 1mm thick copper heat dissipation reinforcing strip, the heat dissipation efficiency is improved by more than 40% compared with the traditional scheme, which can avoid the problems of light decay and dead light caused by excessive LED junction temperature in high temperature environment; the combination of anti-interference signal lines and 10kHz-1GHz frequency band EMC filter can resist the electromagnetic interference of engine and wireless devices in the vehicle, reduce the display mura rate by 90%, and reduce the touch misoperation rate from 47% of the traditional scheme to below 5%. In terms of display effect, by matching the brightness ratio with the regional tone value, the color saturation of key warning information is improved by 30%, the recognition speed in strong light + high speed scene is 40% faster than the traditional scheme, there is no glare in weak light scene, and the display target of "clear visibility in all light environments and accurate transmission of key information" is achieved.

[0012] 2, The embodiment of the scheme, in energy consumption optimization and scene dynamic adaptation ability advantage outstanding, perfect fit vehicle system "low power consumption, high adaptation" use demand. Energy consumption management level, for different power and scene to develop fine strategy: high power, according to the functional area accurate calculation PWM duty cycle, low power through "90% duty cycle correction" to achieve energy saving, static scene drive current from 20mA to 12-14mA, dynamic scene through "motion area marking + non motion area power reduction 20% " make the overall power consumption reduces 15%-20%, new energy vehicle range can be extended 5%-8%. Scene adaptation level, can identify static, dynamic, key information three kinds of scene and match parameters: static scene low power consumption, dynamic scene to ensure smoothness, key information scene through the red channel brightness 15%-25% to strengthen warning, avoid the existing scheme "one size fits all" brightness adjustment caused by "energy waste" or "information fuzzy" problem, adapt to the whole scene display needs from parking navigation to high speed.

[0013] 3, The embodiment of the scheme, through the perfect hardware protection and operation and maintenance design, greatly improve the use safety and operation convenience of interactive screen, reduce the user use risk and later cost. Security protection level, build "temperature-current-voltage" three hardware protection system: temperature > 85 DEG C reduce power 50%, > 100 DEG C cut off output, current > 24mA step current limiting (5% / time), voltage anomaly (> 16V or < 9V) cut off drive power, response delay ≤100ms, can avoid permanent damage caused by hardware overheating, overcurrent, overvoltage; At the same time, the power supply of the core control system is reserved to ensure that the key warning information is not interrupted in case of failure. Operation and early warning level, hardware protection fault log can accurately record the trigger time, parameter value and recovery process, so that the fault diagnosis efficiency is improved by 60%; Early warning function can remind the driver to pay attention to the equipment state in advance, avoid the influence of protection mechanism on use experience caused by frequent triggering, compared with the traditional scheme "no warning, difficult to trace", greatly reduce the later maintenance cost and user use trouble. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, without creative labor, other drawings can also be obtained according to these drawings.

[0015] Figure 1 The system module connection diagram of the present application. DETAILED DESCRIPTION

[0016] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0017] The embodiment of the present application comprises Figure 1 As shown in the figure, a kind of automobile interactive screen image display technology based on red and yellow LED, comprising: double-channel LED array construction module, image signal preprocessing and parameter calculation module and dynamic driving display control module.

[0018] The image signal preprocessing and parameter calculation module is connected with the double-channel LED array construction module and the dynamic driving display control module respectively.

[0019] The double-channel LED array construction module is used to construct the display screen array of the target automobile interactive screen based on the LED integrated with red channel and yellow channel as basic unit, and synchronously complete the high-thermal-conductivity substrate manufacturing and anti-interference signal line design of the target automobile interactive screen.

[0020] In a specific embodiment, the display screen array of the target automobile interactive screen is constructed in the following specific construction process: in the target automobile interactive screen selection configuration, the LED chip integrated with red channel and yellow channel is used, the brightness deviation of the same batch of chips is less than or equal to 5%, the high-thermal-conductivity substrate adopts metal matrix composite material with thermal conductivity coefficient greater than or equal to 200 W / (m·K), the substrate edge is pasted with 1mm thick copper heat dissipation reinforcing strip, the thermal conductivity coefficient is greater than or equal to 3.0 W / (m·K) through the thermal conductive silica gel paste, the anti-interference signal line etching width is 0.2-0.3mm, the outer layer is wrapped with polytetrafluoroethylene insulating layer, and the signal input interface is installed with 10kHz-1GHz frequency band EMC filter.

[0021] It should be noted that a circular arc transition is used at the signal line inflection point to avoid signal reflection; after the EMC filter is installed at the signal input interface, conductive glue is additionally applied at the interface and a metal shielding cover is additionally installed, to further block electromagnetic radiation; finally, the entire display screen array needs to undergo high-low temperature cycle, vibration and electromagnetic compatibility test to ensure that the long-term stability requirements in vehicle-mounted environment are met, and all materials need to pass the RoHS2.0 environmental protection certification to avoid the impact of harmful substances on the vehicle interior environment.

[0022] The image signal preprocessing and parameter calculation module is configured to receive external image data of the target vehicle interactive screen vehicle-mounted system at the current time when the target vehicle interactive screen is started, and set target brightness corresponding to each functional area of the target vehicle interactive screen in combination with real-time data of the target vehicle environment and state, and analyze the brightness proportion and PWM duty cycle corresponding to each LED pixel point in each functional area of the target vehicle interactive screen.

[0023] In a specific embodiment, the target brightness corresponding to each functional area of the target vehicle interactive screen is set as follows: A1, first, after the target vehicle is started, the target vehicle interactive screen is divided into functional areas, thereby being divided into a high-priority warning area, a medium-priority information area and a low-priority background area, and meanwhile, the illumination intensity classification and the vehicle state classification corresponding to the target vehicle are obtained, the illumination intensity classification includes strong light and weak light, and the vehicle state classification includes high-speed driving, low-speed driving and static state.

[0024] It should be noted that, first, based on the external image data received by the interactive screen, the pixel coordinate ranges of different functional modules are identified and marked by pixel RGB feature clustering and edge detection technology, for example, the high-saturation red / orange pixel aggregation area with RGB values satisfying R≥200, G / B≤80, such as a fault warning light, a navigation turning arrow, a high-frequency flashing pixel area with a flashing frequency≥2Hz, such as a low power prompt, is preliminarily determined as a warning area to be classified; the pixel area containing digital / pointer graphics, such as a speed “2000 rpm” and a vehicle speed “120 km / h”, with a gray value fluctuation≤10% and a regular edge contour, a fixed position text information area, such as “current road condition: congestion”, with a font pixel height≥15px, is preliminarily determined as an information area to be classified; the pixel area without clear semantic information, uniform color and dynamic change, such as a navigation map background color and an entertainment interface background, with an RGB value variance≤50, is preliminarily determined as a background area to be classified. Then, the preliminary classification areas are matched with the “functional priority rule library” preset by the vehicle-mounted system: the areas directly related to driving safety, such as fault prompts, collision warnings and driver responses in time, with a response time delay requirement≤0.3 seconds, are defined as the high-priority warning area, and the coordinate ranges are stored in the interactive screen “safety information buffer area” at the same time; the areas transmitting regular driving assistance information, such as speed, road conditions and allowed delay identification, with a response time delay≤1 second, are defined as the medium-priority information area; the areas only serving as picture filling without substantive information transmission function are defined as the low-priority background area. After the division is completed, the “area-coordinate-priority” mapping table is automatically generated by the system, the image data is re-detected every 50ms, and if it is found that the functional modules are switched, such as the user switches from the entertainment interface to the navigation interface, the area division result is updated in real time, so as to ensure that the priority and the functional attribute are always matched.

[0025] It also needs to be explained that based on the external image data received by the interactive screen, the resolution is 1920x1080 pixels common on vehicles, each pixel contains R / G / B three channels of 8-bit data, the value is 0-255, and the function module recognition is realized through the three steps of "pixel RGB feature clustering → edge detection optimization → coordinate marking":

[0026] First, pixel RGB feature clustering: using K-means clustering algorithm (preset clustering number K=5, corresponding to typical module colors such as warning, information, background), first normalize the RGB data of all pixels (divide R / G / B values by 255 respectively, convert to 0-1 interval), then calculate the Euclidean distance of each pixel from the cluster center (preset initial center based on common colors on vehicle interactive screen: such as warning R=0.8, G=0.2, B=0.2; information R=0.3, G=0.3, B=0.8; background R=0.9, G=0.9, B=0.9), and the pixels with the smallest distance are classified into the same class. For example, the fault warning light pixel (R=220, G=50, B=50, normalized to 0.86, 0.2, 0.2) will be classified into "warning class clustering", and the navigation map background pixel (R=240, G=240, B=240, normalized to 0.94, 0.94, 0.94) will be classified into "background class clustering". After clustering, remove discrete clusters with less than 100 pixels (considered as noise), and keep 5 core clusters to preliminarily distinguish the color regions of different function modules.

[0027] Second, edge detection optimization: using Canny edge detection algorithm on the clustered image, first smoothing the image through 5x5 Gaussian filter (standard deviation σ=1.4) to reduce noise interference; then calculate the image gradient (horizontal direction using Sobel operator Gx, vertical direction using Sobel operator Gy) to get the gradient amplitude and direction; then through "non-maximum suppression" to eliminate redundant edge pixels, only keeping the local maximum value pixels in the gradient direction; finally set double threshold (high threshold 70, low threshold 30), mark the pixels with gradient amplitude greater than high threshold as strong edge, mark the pixels between high and low thresholds and connected with strong edge as weak edge, and the rest as non-edge. For example, the speed number in the information class cluster (such as "120km / h"), the outline edge of the number can be clearly extracted through edge detection to distinguish the number from the background; the triangular fault icon in the warning class cluster can be determined through edge detection to avoid confusion with the surrounding similar color area.

[0028] Third step, pixel coordinate marking: for the image after edge detection, determine the pixel coordinate range of each functional module according to "cluster category + edge contour": for each core cluster, traverse all the edge pixels contained therein, record the maximum / minimum X-axis coordinates (Xmax, Xmin) and Y-axis coordinates (Ymax, Ymin) of the edge pixels, and the rectangular region with (Xmin, Ymin) as the upper left corner and (Xmax, Ymax) as the lower right corner is the pixel coordinate range of the functional module; at the same time, the non-edge pixels in the rectangular region (such as the inside of the numbers and the filling area of the icons) are checked again, and if their RGB values belong to the corresponding cluster and are connected with the edge pixels, they are included in the coordinate range. For example, the final warning module coordinate may be (Xmin=200, Ymin=300, Xmax=300, Ymax=400), and the information module coordinate is (Xmin=500, Ymin=600, Xmax=800, Ymax=700), and the coordinate data of all modules are stored in the "functional area coordinate table" to provide location basis for subsequent priority division.

[0029] Again, it needs to be pointed out that in terms of light intensity grading, relying on the vehicle-grade ambient light sensor integrated in the inner side of the automobile front windshield, such as BH1750FVI, with a measurement range of 0-65535 lux and an accuracy of ±20%, the light intensity raw data of the interactive screen surrounding environment is collected in real time at a frequency of 1 Hz; After collection, the effective light value L is obtained by removing transient interference such as temporary irradiation of the opposite car light through sliding average filtering; then according to the preset grading threshold: if the effective light value L≥10000lux, corresponding to the noon direct sunlight scene on a sunny day, it is determined as "strong light" grading; if L≤100lux, corresponding to the scene without street light at night or in the tunnel, it is determined as "weak light" grading, and the determination result is transmitted to the image signal preprocessing and parameter calculation module in real time.

[0030] In terms of vehicle state grading, two types of core data are received in real time through the vehicle CAN bus: one is the wheel speed sensor data from the ABS system, which is converted into the real-time vehicle speed V; the other is the speed data from the engine ECU, which is used to assist in determining whether the vehicle is in power output state; the data collection frequency is 10Hz to ensure real-time performance at high speed; the abnormal jump value of the vehicle speed is removed in the preprocessing stage to obtain the effective vehicle speed V; then according to the grading threshold: if the effective vehicle speed V≥100km / h, it is determined as "high speed driving"; if 10km / h

[0031] A2, if the light intensity corresponding to the target car is classified as strong light and the vehicle state is classified as high-speed driving, a high-priority warning area of the target car interactive screen is set: the target brightness is 960 cd / m2, a medium-priority information area: the target brightness is 600 cd / m2, and a low-priority background area: the target brightness is 360 cd / m2.

[0032] A3, if the light intensity corresponding to the target car is classified as strong light and the vehicle state is classified as low-speed driving, a high-priority warning area of the target car interactive screen is set: the target brightness is 880 cd / m2, a medium-priority information area: the target brightness is 540 cd / m2, and a low-priority background area: the target brightness is 320 cd / m2.

[0033] A4, if the light intensity corresponding to the target car is classified as strong light and the vehicle state is classified as static, a high-priority warning area of the target car interactive screen is set: the target brightness is 820 cd / m2, a medium-priority information area: the target brightness is 590 cd / m2, and a low-priority background area: the target brightness is 290 cd / m2.

[0034] A5, if the light intensity corresponding to the target car is classified as weak light and the vehicle state is classified as high-speed driving, a high-priority warning area of the target car interactive screen is set: the target brightness is 420 cd / m2, a medium-priority information area: the target brightness is 260 cd / m2, and a low-priority background area: the target brightness is 160 cd / m2.

[0035] A6, if the light intensity corresponding to the target car is classified as weak light and the vehicle state is classified as high-speed driving, a high-priority warning area of the target car interactive screen is set: the target brightness is 380 cd / m2, a medium-priority information area: the target brightness is 230 cd / m2, and a low-priority background area: the target brightness is 140 cd / m2.

[0036] A7, if the light intensity corresponding to the target car is classified as weak light and the vehicle state is classified as static, a high-priority warning area of the target car interactive screen is set: the target brightness is 340 cd / m2, a medium-priority information area: the target brightness is 200 cd / m2, and a low-priority background area: the target brightness is 120 cd / m2.

[0037] In a specific embodiment, the brightness proportion of each LED pixel point corresponding to each functional area of the target car interactive screen is analyzed, and the specific analysis process is as follows: B1, the hue value corresponding to each functional area of the target car interactive screen is obtained, denoted as When the hue value corresponding to a functional area of the target car interactive screen is located in 0° to 30°, the brightness proportion of each LED pixel point in the function area of the target automobile interaction screen is set as: high-priority warning area: red channel proportion 80%, yellow channel proportion 20%; medium-priority information area: red channel proportion 75%, yellow channel proportion 25%; low-priority background area: red channel proportion 70%, yellow channel proportion 30%.

[0038] It should be noted that the acquisition of the hue value of each function area of the target automobile interaction screen is based on the segmented function area (high-priority warning area, medium-priority information area, low-priority background area) pixel data, and is realized through four steps of "region pixel sampling → RGB data preprocessing → HSV color model conversion → hue value calculation": first, for each function area, the pixel data is extracted according to the "uniform grid sampling method" - taking the function area pixel coordinate range (such as high-priority warning area Xmin=200-Ymin=300 to Xmax=300-Ymax=400) as the boundary, 10×10 uniform grid is divided, if the total number of region pixels <100, full sampling is performed to ensure that the sampling points cover different positions in the region; then, the RGB original data (R, G, B value 0-255) of each sampling point is preprocessed, first, the invalid data such as R / G / B single channel value >255 or <0 is removed, and then the color fluctuation is smoothed through 3×3 Gaussian filter, such as the mixed color pixels at the edge of the warning area red icon, to obtain the hue value of each sampling point sampling; finally, the H sampling value of all sampling points in the same function area is arithmetically averaged, and the maximum and minimum values are removed to reduce the influence of extreme values, to obtain the average hue value of the function area area, retaining 1 decimal place, such as high-priority warning area area = 15.2°, low-priority background area area = 52.7°, and is stored in association with the function area number and coordinate range, providing color basis for subsequent brightness proportion setting.

[0039] B2, when the hue value of a function area of the target automobile interaction screen is located in 30° to 60°, the brightness proportion of each LED pixel point in the function area of the target automobile interaction screen is set as: high-priority warning area: red channel proportion 30%, yellow channel proportion 70%; medium-priority information area: red channel proportion 25%, yellow channel proportion 75%; low-priority background area: red channel proportion 20%, yellow channel proportion 80%. located in 30° to 60°, the brightness proportion of each LED pixel point in the function area of the target automobile interaction screen is set as: high-priority warning area: red channel proportion 30%, yellow channel proportion 70%; medium-priority information area: red channel proportion 25%, yellow channel proportion 75%; low-priority background area: red channel proportion 20%, yellow channel proportion 80%.

[0040] B3, when the hue value of a function area of the target automobile interaction screen is located in 60° to 90°, the brightness proportion of each LED pixel point in the function area of the target automobile interaction screen is set as: high-priority warning area: red channel proportion 20%, yellow channel proportion 80%; medium-priority information area: red channel proportion 15%, yellow channel proportion 85%; low-priority background area: red channel proportion 10%, yellow channel proportion 90%. If the angle is outside the range of 0° to 60°, the brightness proportion of each LED pixel point in the functional area of the target automobile interactive screen is set as follows: high-priority warning area: forced adjustment to 0°-30° red proportion, red channel 80%, yellow channel 20%; medium-priority information area: red channel proportion 55%, yellow channel proportion 45%; low-priority background area: red channel proportion 25%, yellow channel proportion 75%.

[0041] In a specific embodiment, the PWM duty cycle of each LED pixel point in each functional area of the target automobile interactive screen is analyzed as follows: C1, evaluate the vehicle-mounted power corresponding to the target automobile. If the vehicle-mounted power corresponding to the target automobile is high, obtain the current red channel brightness and yellow channel brightness of each LED pixel point in each functional area of the target automobile interactive screen, and denote them as R and Y, respectively. and wherein, represents the number corresponding to each functional area, , represents the number corresponding to each LED pixel point, , substitute the red channel PWM duty cycle calculation formula: =( / )×100% wherein, is the set maximum brightness of the red channel, and the red channel PWM duty cycle of each functional area of the target automobile interactive screen is obtained , and the basic duty cycle of each functional area of the target automobile interactive screen is taken as the red channel PWM duty cycle of each LED pixel point in each functional area of the target automobile interactive screen.

[0042] It should be noted that, firstly, the BMS collects the core parameters of the vehicle's power battery in real time, including the average voltage of individual cells, the remaining battery capacity, and the charging and discharging current. Simultaneously, it receives the output voltage of the vehicle's alternator via the CAN bus to determine whether it is in a charging state. All data is transmitted in real time to the interactive screen's image signal preprocessing and parameter calculation module. Next, the collected raw data undergoes multi-dimensional verification: firstly, comparing the average voltage of individual cells with the battery's nominal voltage. For example, if a 12V lead-acid battery has a nominal voltage of 12.6V, and the average voltage is 12.4V, further judgment is needed based on the State of Charge (SOC). Secondly, the SOC value is corrected using the charging and discharging current. For example, when the discharge current is >10A, the SOC value is reduced by 1% every 10 minutes to avoid SOC calculation errors caused by high-current discharge. Thirdly, temporary... In case of charging interference, if the generator output voltage is >13.5V for 30 seconds, it is determined to be in a charging state, and the power level is temporarily not implemented. After charging stops, it is re-evaluated to obtain a stable "effective SOC value". Finally, the power level is determined according to the preset threshold: if the effective SOC value is >20% and the average voltage of a single battery cell is ≥12.0V or ≥3.2V / cell, it is determined to be "high power"; if the effective SOC value is ≤20%, or the average voltage of a single battery cell is <12.0V (12V system) / <3.2V / cell, it is determined to be "low power". The evaluation result is synchronously fed back to the PWM duty cycle calculation module to provide a basis for subsequent duty cycle correction, and it is re-evaluated every 30 seconds to ensure dynamic adaptation to the real-time battery status. The example is only for illustration and is not the only limitation.

[0043] C2. Substitute the formula for calculating the PWM duty cycle of the yellow channel: =( / In ) × 100%, where, To determine the maximum brightness of the yellow channel, the PWM duty cycle of the yellow channel corresponding to each functional area of ​​the target car's interactive screen is obtained. Then the basic duty cycle corresponding to each functional area of ​​the target car interactive screen is used as the yellow channel PWM duty cycle corresponding to each LED pixel in each functional area of ​​the target car interactive screen.

[0044] C3. If the battery level of the target vehicle is low, the PWM duty cycle of each LED pixel in each functional area of ​​the target vehicle's interactive screen will be corrected.

[0045] In a specific embodiment, the correction of the PWM duty cycle corresponding to each LED pixel in each functional area of ​​the target car interactive screen is carried out as follows: the PWM duty cycle of the red channel and the PWM duty cycle of the yellow channel corresponding to each LED pixel in each functional area of ​​the target car interactive screen are both corrected to 90%, and the correction formula is as follows: ×0.9 and x 0.9.

[0046] The dynamic driving display control module is used for sending the brightness proportion and the PWM duty cycle corresponding to each LED pixel point in each functional area of the target automobile interaction screen to the LED driving chip, and analyzing the scene dynamic adjustment parameters corresponding to the target automobile interaction screen, and then evaluating whether the target automobile interaction screen starts the hardware protection mechanism.

[0047] In a specific embodiment, the scene dynamic adjustment parameters corresponding to the target automobile interaction screen are analyzed, and the specific analysis process is as follows: the scene dynamics corresponding to the target automobile interaction screen are obtained, if the target automobile interaction screen is in a static scene, a low-power mode is started, the LED driving current is reduced from the rated 20 mA to 12-14 mA, if the target automobile interaction screen is in a dynamic scene, a dynamic power balance algorithm is started, the image motion area is marked, the LED power of the non-motion area is reduced by 20%, and the overall power consumption is reduced by 15%-20%; if the target automobile interaction screen is in a key information scene, the red channel brightness corresponding to each LED pixel point in each functional area of the target automobile interaction screen is increased by 15%-25%, the yellow channel brightness is maintained unchanged, the red channel PWM duty cycle is increased by 30%, and the yellow channel PWM duty cycle is reduced by 30%.

[0048] It should be noted that the acquisition of the target automobile interaction screen scene dynamic is achieved through three steps of "multi-source data acquisition → image feature analysis → scene rule matching". First, three types of core data are synchronously collected: one is the image frame sequence displayed in real time by the interaction screen, 10 continuous image frames are cached through the image acquisition module; the second is user operation data, which is obtained through the touch screen, steering wheel shortcut key or voice module, such as "opening navigation" and "playing video" instructions; and the third is vehicle state associated data, which is obtained through the CAN bus to obtain the vehicle speed and whether the ADAS function is turned on, to assist in judging the scene priority. Then, the image frame sequence is analyzed for features: the inter-frame difference method is used to calculate the pixel change rate ΔP = number of changed pixels / total number of pixels of two continuous image frames. If ΔP < 5% in 10 frames and there is no dynamic operation of the user such as sliding and clicking, it is preliminarily determined to be a static scene candidate; if ΔP ≥ 10% and there is a continuous inter-frame motion trajectory such as the movement of a person in a video picture and map zooming, it is preliminarily determined to be a dynamic scene candidate; at the same time, the key information region is identified through RGB feature matching, such as a pixel region with a red channel ratio ≥ 80% and a ratio ≥ 5%, and the outline features of navigation arrows and fault prompts. If the key information region is continuously displayed for ≥ 3 seconds, it is preliminarily determined to be a key information scene candidate. Finally, the final determination is completed in combination with the scene rule library: the static scene needs to meet "image ΔP < 5% + no dynamic operation + vehicle speed ≤ 10 km / h, which can be selected, such as parking navigation"; the dynamic scene needs to meet "image ΔP ≥ 10% + existence of user dynamic operation, such as playing video or vehicle speed > 10 km / h, such as map updating during driving"; and the key information scene needs to meet "key information region identification success + vehicle state triggering, such as low power and ADAS warning", and has the highest priority. If there is a conflict with other scenes, the key information scene is determined first. The determination result is fed back to the dynamic driving display control module in real time, which is used to trigger the corresponding power consumption control or brightness adjustment strategy. The scene dynamic identification is re-evaluated every 50 ms to ensure the real-time performance and accuracy of the scene dynamic identification.

[0049] In a specific embodiment, the evaluation of whether the target automobile interaction screen starts a hardware protection mechanism is as follows: D1, the real-time substrate temperature T, the effective current value I and the effective voltage value U corresponding to the target automobile interaction screen are obtained. The temperature protection determination is as follows: if T > 85°C and T ≤ 100°C, the "power reduction protection" mechanism is started; if T > 100°C, the "cut-off protection" mechanism is started. The current protection determination is as follows: if I > 24mA, the "current limiting protection" mechanism is started. The voltage protection determination is as follows: if U > 16V or U < 9V, the "power-off protection" mechanism is started.

[0050] It should be noted that the real-time substrate temperature T is obtained by a DS18B20 temperature sensor integrated on the high thermal conductivity substrate of the LED array, the sensor collects raw temperature data at a frequency of 1 Hz, transmits to the dynamic drive display control module through the I2C interface, and then removes the instantaneous fluctuation through the sliding average filter to obtain the effective temperature value T with a precision of ±0.5°C; the effective current value I is collected by a sampling resistor connected in series in the LED drive circuit, the resistor voltage drop is converted into a current signal by a current sampling chip, transmitted through the SPI interface at a frequency of 5 Hz, and after removing the abnormal value of single jump > 5mA, the effective current value I is obtained; the effective voltage value U is collected by the INA219 module connected in parallel in the power supply circuit, the module outputs the input voltage raw data at a frequency of 1 Hz, and is cross-checked with the battery voltage obtained from the vehicle CAN bus, and finally the effective voltage value U with a precision of ±0.1V is obtained, and the three types of data are all stored in the module buffer in real time to provide the basis for the hardware protection mechanism judgment.

[0051] D2, if the target automotive interaction screen starts the hardware protection mechanism, then analyze the hardware protection mechanism adjustment value corresponding to the target automotive interaction screen.

[0052] In a specific embodiment, the analysis of the hardware protection mechanism adjustment value corresponding to the target automotive interaction screen is as follows: E1, start the "power reduction protection" mechanism, and reduce the LED drive power by 50% through the PWM duty cycle synchronous reduction.

[0053] E2, start the "cut-off protection" mechanism, turn off the PWM output and display a red flashing "high temperature protection" warning on the interaction screen.

[0054] E3, start the "current limiting protection" mechanism, reduce the PWM duty cycle by 5% per step, and re-collect the current every 0.1 seconds until I≤24mA; if I is still >24mA after 5 consecutive reductions, add the "half-cut protection" mechanism, and only keep the power supply for the high-priority warning area.

[0055] E4, start the "power-off protection" mechanism, cut off the total power supply of the LED drive circuit, only keep the 5V low-voltage power supply for the core control system, and send a voltage abnormal signal to the vehicle BMS.

[0056] In a specific embodiment, the hardware protection failure log and warning function are as follows: after each hardware protection trigger, automatically record the trigger time, trigger parameter value, protection type, recovery process parameter and result, the log storage period is ≥30 days, and the log can be exported through the vehicle diagnostic interface for fault troubleshooting; the warning function: when the target automotive interaction screen starts the hardware protection mechanism, start the warning, display a light yellow prompt icon on the interaction screen, and send a warning signal to the vehicle ECU, reminding the driver to pay attention to the interaction screen state, and avoiding the frequent triggering of the protection mechanism affecting the user experience.

[0057] The above merely provides the illustration and description of the concept of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or adopt similar ways to replace, as long as they do not deviate from the concept of the present application or exceed the range defined in the specification, which shall belong to the protection scope of the present application.

Claims

1. A red and yellow LED based automotive interactive screen image display technology characterized in that, The application relates to a target automobile interactive screen display screen array construction method. The application relates to a target automobile interactive screen display screen array construction method. The application relates to a target automobile interactive screen display screen array construction method. The application relates to a target automobile interactive screen display screen array construction method. The application relates to a target automobile interactive screen display screen array construction method. B1, obtain the color value corresponding to each functional area of the target automobile interaction screen, denoted as When the color value corresponding to a certain functional area of the target automobile interaction screen is located within 0° to 30°, the luminance proportion corresponding to each LED pixel point in the functional area of the target automobile interaction screen is set as: high-priority warning area: red channel proportion 80%, yellow channel proportion 20%. The application relates to a target automobile interactive screen display screen array construction method. B2, when the target automobile interaction screen certain function area corresponding to the hue value 30° to 60°, the target automobile interaction screen the function area corresponding to the brightness of each LED pixel point is set to: high priority warning area: red channel 30%, yellow channel 70%; The application relates to a target automobile interactive screen display screen array construction method. B3、when the target car interaction screen some function area corresponding to the hue value located outside 0° to 60°, the target car interaction screen the function area corresponding to the brightness proportion of each LED pixel point is set as: high priority warning area: forced adjustment to 0°-30° red proportion, red channel 80%, yellow channel 20%, medium priority information area: red channel proportion 55%, yellow channel proportion 45%; low priority background area: red channel proportion 25%, yellow channel proportion 75%; The application relates to a target automobile interactive screen display screen array construction method.

2. A red and yellow LED based automotive interactive screen image display technology as claimed in claim 1, wherein, The application relates to a target automobile interactive screen display screen array construction method. The application relates to a target automobile interactive screen display screen array construction method.

3. A red and yellow LED based automotive interactive screen image display technology as claimed in claim 2, wherein, The application relates to a target automobile interactive screen display screen array construction method. The application relates to a target automobile interactive screen display screen array construction method. The application relates to a target automobile interactive screen display screen array construction method. The application relates to a target automobile interactive screen display screen array construction method. The application relates to a target automobile interactive screen display screen array construction method. The application relates to a target automobile interactive screen display screen array construction method. The application relates to a target automobile interactive screen display screen array construction method. The application relates to a target automobile interactive screen display screen array construction method. 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The application relates to a target automobile interactive A3, if the light intensity corresponding to the target car is classified as strong light and the vehicle state is classified as low-speed driving, set the high-priority warning area of the target car interactive screen high: the target brightness is 880 cd / ㎡, the medium-priority information area: the target brightness is 540 cd / ㎡, and the low-priority background area: the target brightness is 320 cd / ㎡; A4, if the light intensity corresponding to the target car is classified as strong light and the vehicle state is classified as static, set the high-priority warning area of the target car interactive screen high: the target brightness is 820 cd / ㎡, the medium-priority information area: the target brightness is 590 cd / ㎡, and the low-priority background area: the target brightness is 290 cd / ㎡; A5, if the light intensity corresponding to the target car is classified as weak light and the vehicle state is classified as high-speed driving, set the high-priority warning area of the target car interactive screen high: the target brightness is 420 cd / ㎡, the medium-priority information area: the target brightness is 260 cd / ㎡, and the low-priority background area: the target brightness is 160 cd / ㎡; A6, if the light intensity corresponding to the target car is classified as weak light and the vehicle state is classified as high-speed driving, set the high-priority warning area of the target car interactive screen high: the target brightness is 380 cd / ㎡, the medium-priority information area: the target brightness is 230 cd / ㎡, and the low-priority background area: the target brightness is 140 cd / ㎡; A7, if the light intensity corresponding to the target car is classified as weak light and the vehicle state is classified as static, set the high-priority warning area of the target car interactive screen high: the target brightness is 340 cd / ㎡, the medium-priority information area: the target brightness is 200 cd / ㎡, and the low-priority background area: the target brightness is 120 cd / ㎡.

4. A red and yellow LED based automotive interactive screen image display technology as claimed in claim 3, wherein, The PWM duty cycle corresponding to each LED pixel point in each functional area of the target car interactive screen is analyzed, and the specific analysis process is as follows: C1, evaluate the vehicle-mounted power corresponding to the target vehicle, if the vehicle-mounted power corresponding to the target vehicle is high power, the current brightness of the red channel and the current brightness of the yellow channel corresponding to each LED pixel point in each functional area of the target vehicle interactive screen are obtained, and are respectively denoted as and , wherein, indicates the number corresponding to each functional area, , indicates the number corresponding to each LED pixel point, , the red channel PWM duty cycle calculation formula is substituted: =( / )×100% wherein, is the maximum brightness of the red channel, the red channel PWM duty cycle corresponding to each functional area of the target vehicle interactive screen is obtained , then the basic duty cycle corresponding to each functional area of the target vehicle interactive screen is taken as the red channel PWM duty cycle corresponding to each LED pixel point in each functional area of the target vehicle interactive screen. C2, substitute yellow channel PWM duty cycle calculation formula: = ( / ) x 100% in which, The set maximum brightness of the yellow channel, the target car interactive screen corresponding to each functional area of the yellow channel PWM duty cycle Then the target car interactive screen corresponding to each functional area of the basic duty cycle is taken as the yellow channel PWM duty cycle corresponding to each LED pixel point in each functional area of the target car interactive screen. C3, if the vehicle-mounted power corresponding to the target car is low, the PWM duty cycle corresponding to each LED pixel point in each functional area of the target car interactive screen is corrected.

5. A red and yellow LED based automotive interactive screen image display technology as claimed in claim 4, wherein, The PWM duty cycle corresponding to each LED pixel point in each functional area of the target car interactive screen is corrected, and the specific correction process is as follows: The red channel PWM duty ratio and the yellow channel PWM duty ratio corresponding to each LED pixel point in each functional area of the target automobile interactive screen are both corrected according to 90%, and the correction formula is: × 0.9 and × 0.

9.

6. A red and yellow LED based automotive interactive screen image display technology as claimed in claim 5, wherein, The scene dynamic adjustment parameters corresponding to the target car interactive screen are analyzed, and the specific analysis process is as follows: The scene dynamic corresponding to the target car interactive screen is obtained, if the target car interactive screen is in a static scene: a low-power mode is started, the LED driving current is reduced from the rated 20 mA to 12-14 mA, if the target car interactive screen is in a dynamic scene: a dynamic power balance algorithm is started, the moving area of the image is marked, the LED power of the non-moving area is reduced by 20%, and the overall power consumption is reduced by 15%-20%; If the target car interactive screen is in a key information scene: the red channel brightness of each LED pixel point in each functional area of the target car interactive screen is improved by 15%-25%, the yellow channel brightness is maintained unchanged, the red channel PWM duty cycle is improved by 30%, and the yellow channel PWM duty cycle is reduced by 30%.

7. A red and yellow LED based automotive interactive screen image display technology as claimed in claim 6, wherein, The specific evaluation process is as follows: D1, obtain the real-time substrate temperature T, effective current value I and effective voltage value U corresponding to the target automotive interactive screen, temperature protection determination: if T>85℃ and T≤100℃, start the "power reduction protection" mechanism; if T>100℃, start the "cut-off protection" mechanism; current protection determination: if I>24mA, start the "current limiting protection" mechanism; voltage protection determination: if U>16V or U<9V, start the "power-off protection" mechanism; D2, if the target automotive interactive screen starts the hardware protection mechanism, further analyze the hardware protection mechanism adjustment value corresponding to the target automotive interactive screen.

8. A red and yellow LED based automotive interactive screen image display technology as claimed in claim 7, wherein, The analysis of the hardware protection mechanism adjustment value corresponding to the target automotive interactive screen is as follows: E1, start the "power reduction protection" mechanism, and synchronously reduce the PWM duty cycle by 50% to reduce the LED driving power; E2, start the "cut-off protection" mechanism, turn off the PWM output and display a red flashing "high temperature protection" warning on the interactive screen; E3, start the "current limiting protection" mechanism, reduce the PWM duty cycle by 5% per step, reacquire the current every 0.1 seconds until I≤24mA; if I is still >24mA after 5 consecutive reductions, add the "half-cut protection" mechanism, only the high-priority warning area is powered; E4, start the "power-off protection" mechanism, cut off the total power supply of the LED driving circuit, only keep the 5V low-voltage power supply of the core control system, and send a voltage abnormal signal to the vehicle-mounted BMS.

9. A red and yellow LED based automotive interactive screen image display technology as claimed in claim 1, wherein, It also includes a hardware protection fault log and early warning function, which is: after each hardware protection is triggered, the trigger time, trigger parameter value, protection type, recovery process parameter and result are automatically recorded, the log storage period is ≥30 days, and it supports export through the vehicle-mounted diagnostic interface, which is convenient for fault troubleshooting; Early warning function: when the target automotive interactive screen starts the hardware protection mechanism, start the early warning, display a light yellow prompt icon on the interactive screen, and send an early warning signal to the vehicle-mounted ECU to remind the driver to pay attention to the interactive screen state and avoid frequent triggering of the protection mechanism affecting the use experience.

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