LCD screen temperature adaptive control method and device for special vehicles

Abstract

The present invention discloses a method and device for adaptively controlling the temperature of a liquid crystal display screen for a special vehicle, the method comprising obtaining the resistance encountered on the heat flow path of components; performing thermal simulation on the operation of the liquid crystal display screen according to the arrangement position of the vehicle-mounted liquid crystal display screen in the vehicle to obtain a thermal simulation data model of the operation of the liquid crystal display screen, obtaining the maximum stable operating temperature of the liquid crystal display screen components and bringing the thermal simulation data model into the thermal simulation data model to obtain the thermal simulation results of the operation of the liquid crystal display screen; obtaining a temperature range in which the liquid crystal display screen cannot operate at all according to the thermal simulation results of the operation of the liquid crystal display screen; adaptively adjusting the brightness of the liquid crystal display screen according to the temperature range in which the liquid crystal display screen cannot operate at all, so as to realize the normal display function of the liquid crystal display screen in full-time and full-domain scenarios; carrying out a thermal balance test of the scheme in high temperature and high cold extreme temperature scenarios on the vehicle to verify the accuracy of the scheme; the present invention can realize the monitoring and protection of the full-time and full-domain liquid crystal display screen temperature control system.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid crystal screen temperature control, and more specifically, relates to a liquid crystal screen temperature adaptive control method and device for special vehicles. Background Art

[0002] The usage rate of LCD screens in cars is getting higher and higher, but the use environment of special vehicles is very harsh, requiring normal use in all areas and at all times. The operating temperature of LCD screens for consumer products is usually 0℃~50℃ at room temperature, the operating temperature of industrial-grade LCD screens is -20℃~70℃, and the operating temperature of conventional civilian car-grade display screens is -30℃-85℃. However, for the field of special vehicles, it is obvious that the three types of products mentioned above are difficult to meet the requirements. The high-cold areas with a climate below -30℃ are widely distributed around the world, and special vehicles are performing important tasks in these areas. If black screens, flowery screens and other unusable failures occur, it will have a major destructive impact on signal communication, situational awareness and even control system functions, and thus affect the execution of important tasks, and the adverse consequences are very serious. Relevant companies in the industry will be particularly cautious in the use of LCD screens for vehicles that are often in extreme environments, such as engineering off-road vehicles. Once the LCD screen does not work, in addition to the very poor user experience, the non-operation of the LCD instrument also poses a great hidden danger to driving safety.

[0003] In the existing scheme, manufacturers using full LCD instruments will heat the LCD screen by using resistance wires, heating films, etc. For example, there is a prior art that discloses a power supply and protection method of a dual protection circuit that takes temperature into consideration, which includes: a step-down module, whose input end is connected to an external power supply, and a fuse is connected in series in the connection path between the external power supply and the step-down module; a temperature protection module, including a temperature sensor component and a control unit; the output end of the step-down module is connected to the temperature sensor component via the control unit, and the temperature sensor component transmits the output induced temperature signal to the control unit, and the control unit controls the output state of the step-down module. Although this solution can achieve dual protection against electrical and thermal shocks, and the circuit can recover by itself, it can be applied in the field of circuit protection technology; this solution achieves dual protection against current overload and temperature through a self-resetting fuse and a temperature protection circuit built based on a temperature sensor. The circuit has high stability and strong anti-damage ability; but it can only protect the power supply at high temperatures. Its working characteristics are that in an extremely cold environment, the display screen is first heated up, and then its control system controls each display control system to achieve corresponding functions; in a high temperature environment, the display screen is first cooled down, and then its control system controls each display control system to achieve corresponding functions. The entire temperature control process takes a long time, and during the temperature control process, the system still cannot work normally, and cannot meet the functional requirements of the vehicle display screen to display all the time; and its temperature control process strategies for heating and cooling are not discussed in detail, and there may be application process control risks.

[0004] There is also a patent with the prior art publication number CN214335408U, entitled A Liquid Crystal Display Heating Control and Detection Circuit, which discloses that the Liquid Crystal Display Heating Control and Detection Circuit includes a heating control circuit and a heating detection circuit, and both the heating control circuit and the heating detection circuit are connected to the two ends of the heating component on the Liquid Crystal Display; although this circuit can not only improve the testability of the display, but also detect failed devices in time, and can avoid the LCD display from heating out of control, causing damage to the LCD screen, and improve the reliability of the display; but it can only protect the power supply at high temperatures, and cannot meet the functional requirements of the vehicle-mounted display screen to display all the time; the functional feature of this solution lies in the accuracy and safety of the control during the heating process, and it is only a design method for controlling the temperature rise circuit during the heating process, and cannot realize the function of the full-time and full-domain display screen temperature control system monitoring and protection device.

[0005] Therefore, there is an urgent need for a device that can monitor and protect the temperature control system of a full-time and full-domain LCD display screen to solve the above-mentioned defects of the prior art. Summary of the invention

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a temperature adaptive control method and device for a liquid crystal screen for special vehicles, which optimizes and controls the driving circuit under low temperature and high temperature conditions, performs algorithm simulation calibration and simulation calculation in an ultra-wide temperature range, thereby realizing adaptive brightness adjustment, increasing or decreasing the temperature of the screen backlight itself to achieve normal display function guarantee of the liquid crystal display screen in full-time and full-domain scenarios; the solution is deployed in the early stage of the development of the vehicle-mounted display control system, and a reasonable front-end design is achieved by optimizing circuit design, algorithm control, and simulation verification, thereby avoiding difficulties in matching the after-installation system and reliability risks; the present invention does not require additional hardware heating systems or cooling systems, and can solve the defect that the existing LCD screen temperature control technology cannot achieve full-time and full-domain display screen temperature control monitoring and protection.

[0007] In order to achieve the above object, the first aspect of the present invention provides a temperature adaptive control method of a liquid crystal display for a special vehicle, comprising the following steps:

[0008] S1: Determine the heating coefficient of the components according to the printed circuit board, components and component selection of the vehicle-mounted LCD screen, and obtain the resistance encountered by the LCD screen components in the heat flow path;

[0009] S2: performing thermal simulation on the operation of the LCD screen according to the arrangement position of the vehicle-mounted LCD screen in the vehicle to obtain a thermal simulation data model of the operation of the LCD screen;

[0010] S3: Obtain the thermal resistance between the heat source junction of the LCD component and the component package shell and the power consumption of the component at room temperature according to the semiconductor device specification;

[0011] S4: Calculating the temperature rise of the components on the heat flow path according to the resistance encountered by the LCD components on the heat flow path, the thermal resistance between the heat source junction of the components and the component packaging shell, and the power consumption of the LCD components at room temperature;

[0012] S5: Calculating the maximum stable operating temperature of the LCD components according to the temperature rise of the LCD components in the heat flow path;

[0013] S6: Substituting the maximum stable working temperature of the liquid crystal screen components into the thermal simulation data model to obtain the thermal simulation results of the liquid crystal screen;

[0014] S7: reversely simulate according to the thermal simulation result of the LCD screen to obtain the temperature range in which the LCD screen cannot work at all;

[0015] S8: Adaptively adjust the brightness of the LCD screen according to the temperature range where the LCD screen cannot work at all, so as to realize the normal display function of the LCD screen in all-time and all-domain scenarios;

[0016] S9: Conduct a thermal balance test of the scheme described in steps S1 to S8 on the vehicle under high temperature and extreme cold temperature scenarios to verify the accuracy of the scheme.

[0017] Furthermore, obtaining the temperature range in which the liquid crystal screen cannot work at all in step S7 includes:

[0018] S71: Calculate the maximum stable temperature of the vehicle LCD screen at the highest ambient temperature;

[0019] S72: According to the heat generation coefficient of the components at rated power in the component specification, the backlight of the LCD screen is lowered to reduce the actual power of the LCD screen components, so that the components enter the low power consumption mode; according to the reverse simulation of the junction temperature in the component specification, the maximum ambient temperature of the LCD screen when working at the maximum stable temperature is obtained;

[0020] S73: Based on the maximum heat generation coefficient of the component at maximum power in the component specification, the component is simulated and calculated from the lowest operating temperature to a lower temperature step by step, and the lowest operating temperature that can be obtained by heat generation when the LCD screen works at a low temperature is obtained;

[0021] S74: Obtain a temperature range in which the LCD screen cannot operate at all according to the maximum ambient temperature when the LCD screen operates at the maximum stable temperature and the lowest operating temperature that can be obtained by generating heat when the LCD screen operates at a low temperature.

[0022] Furthermore, step S8 further includes:

[0023] S81: Detecting and obtaining the actual working temperature of the LCD screen through the temperature sensor on the LCD screen components;

[0024] S82: Determine whether the actual operating temperature of the LCD screen is higher than the maximum ambient temperature when the LCD screen is operating at the maximum stable temperature; if yes, control the LCD screen through software to enter a low power consumption mode and reduce the brightness of the LCD screen, and repeat steps S81 and S82; otherwise, execute the next step;

[0025] S83: Determine whether the actual operating temperature of the LCD screen is lower than the lowest operating temperature that can be obtained by the LCD screen generating heat when operating at a low temperature; if yes, control the LCD screen through software to maximize its screen brightness and enter the maximum power operating state; otherwise, execute the next step;

[0026] S84: Control the LCD display screen through software to make it enter a low power consumption mode and reduce the brightness of the LCD display screen.

[0027] Furthermore, the LCD screen components in step S1 include LCD screen components with component heat sinks and LCD screen components without component heat sinks; the LCD screen components without component heat sinks include high-power LCD screen components and low-power LCD screen components.

[0028] Furthermore, for a liquid crystal display component with a component heat sink, the maximum stable operating temperature Tcmax1 of the liquid crystal display component is expressed by formula (1):

[0029] Tcmax1=TJ-P*(RJC+RCS+RSA) (1)

[0030] Among them, TJ is the temperature of the heat source junction of the component; P is the power consumption of the component at room temperature; RJC is the temperature difference between the heat source junction of the component and the component package shell; RCS is the thermal resistance from the component package shell to the component heat sink; RSA is the thermal resistance from the component heat sink to the environment;

[0031] The thermal resistance RCA between the component package and the environment is calculated by formula (2):

[0032] RCA=RCS+RSA=0(2).

[0033] Furthermore, for LCD components without component heat sinks, the maximum stable operating temperature Tcmax2 of high-power LCD components is expressed by equation (3):

[0034] Tcmax2=TJ-P*(RJC+RCA) (3)

[0035] Where: RCA is the thermal resistance between the component package and the environment.

[0036] Furthermore, for LCD components without component heat sinks, the maximum stable operating temperature Tcmax3 of low-power LCD components is expressed by equation (4):

[0037] Tcmax3=TJ-P*RJA(4)

[0038] Among them, RJA is the thermal resistance between the heat source junction of the component and the environment.

[0039] The second aspect of the present invention provides a liquid crystal screen temperature adaptive control system for special vehicles, comprising:

[0040] The LCD screen component thermal resistance acquisition module is used to confirm the heating coefficient of the components according to the printed circuit board, components and component selection of the vehicle-mounted LCD screen, and obtain the resistance encountered by the LCD screen components in the heat flow path;

[0041] A simulation model building module is used to perform thermal simulation on the operation of the LCD screen according to the arrangement position of the vehicle-mounted LCD screen in the vehicle to obtain a thermal simulation data model of the LCD screen operation;

[0042] The component parameter acquisition module is used to obtain the thermal resistance between the heat source junction of the LCD component and the component package shell and the power consumption of the component at room temperature according to the semiconductor device specification;

[0043] Component temperature rise acquisition module, used to calculate the temperature rise of components on the heat flow path according to the resistance encountered by LCD components on the heat flow path, the thermal resistance between the heat source junction of the components and the component packaging shell, and the power consumption of the LCD components at room temperature;

[0044] A maximum stable working temperature acquisition module for components, used to calculate the maximum stable working temperature of the LCD components according to the temperature rise of the LCD components in the heat flow path;

[0045] A thermal simulation result acquisition module is used to substitute the maximum stable temperature of the LCD screen components into the thermal simulation data model to obtain the thermal simulation results of the LCD screen;

[0046] A temperature range acquisition module where the LCD screen cannot work at all, used for reverse simulation based on the thermal simulation result of the LCD screen to obtain the temperature range where the LCD screen cannot work at all;

[0047] The LCD screen full-time domain normal display adjustment module is used to adaptively adjust the brightness of the LCD screen according to the temperature range in which the LCD screen cannot work at all, so as to realize the normal display function of the LCD screen in full-time and full-domain scenarios; and

[0048] The thermal balance test verification module is used to carry out thermal balance tests on the LCD screen on the vehicle under high temperature and high cold extreme temperature scenarios to verify the accuracy of the solution.

[0049] A third aspect of the present invention provides an electronic device, characterized in that it includes: at least one processor, at least one memory and a communication interface; wherein,

[0050] The processor, memory and communication interface communicate with each other;

[0051] The memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the temperature adaptive control method of the LCD screen for special vehicles provided by any one of the various implementation methods of the first aspect of the present invention.

[0052] The fourth aspect of the present invention provides a non-transitory computer-readable storage medium, characterized in that the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions enable the computer to execute the temperature adaptive control method of the LCD screen for special vehicles provided by any one of the various implementation methods of the first aspect of the present invention.

[0053] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0054] (1) The present invention provides a method for adaptively controlling the temperature of a liquid crystal display for a special vehicle. The method optimizes and controls the driving circuit under low and high temperature conditions, combines algorithm simulation calibration and simulation calculation over an ultra-wide temperature range, and realizes adaptive adjustment of the brightness of the liquid crystal display screen. The method increases or decreases the temperature of the screen backlight itself to ensure the normal display function of the liquid crystal display screen in all-time and all-domain scenarios.

[0055] (2) The temperature adaptive control method of a liquid crystal screen for a special vehicle of the present invention is optimized and designed in the early stage of the development of the vehicle display and control system. By optimizing the circuit design, algorithm control, and simulation verification, a reasonable front-end design is achieved to avoid the matching difficulties and reliability risks of the back-end vehicle installation system.

[0056] (3) The present invention provides a method for adaptively controlling the temperature of a liquid crystal screen for a special vehicle. It does not require an additional hardware heating system or cooling system. It uses precise thermal field simulation calculations to analyze and match the temperature rise parameter characteristics of each component. It uses software algorithm optimization to control the power consumption output of the liquid crystal screen itself, thereby achieving self-regulation to increase power consumption under extremely cold conditions, such as increasing the system operating temperature by increasing the display brightness of the screen system. In a high temperature environment, it enters a lower power consumption mode through self-regulation to reduce self-heating and lower its own operating temperature, thereby achieving full-time and full-domain normal functions without adding additional auxiliary heating, thereby reducing costs overall. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic diagram of a flow chart of a method for adaptively controlling the temperature of a liquid crystal screen for a special vehicle according to an embodiment of the present invention;

[0058] Figure 2 It is a schematic diagram of a simulation model of display screen installation layout position of a liquid crystal screen temperature adaptive control method for special vehicles according to an embodiment of the present invention;

[0059] Figure 3 A schematic diagram of thermal simulation calculation of a method for adaptively controlling the temperature of a liquid crystal screen for a special vehicle according to an embodiment of the present invention;

[0060] Figure 4It is a schematic diagram of a flow chart of a method for adaptively controlling the temperature of a liquid crystal screen for a special vehicle according to an embodiment of the present invention for obtaining a temperature range in which the liquid crystal screen cannot work at all;

[0061] Figure 5 It is a schematic diagram of high temperature results of thermal simulation of a method for adaptive temperature control of a liquid crystal screen for a special vehicle according to an embodiment of the present invention;

[0062] Figure 6 It is a schematic diagram of the high temperature improvement result of the temperature adaptive control method of the liquid crystal screen for special vehicles according to an embodiment of the present invention;

[0063] Figure 7 It is a schematic diagram of the low temperature improvement result of the temperature adaptive control method of the liquid crystal screen for special vehicles according to an embodiment of the present invention;

[0064] Figure 8 It is a schematic diagram of a flow chart of a method for adaptively controlling the temperature of a liquid crystal screen for a special vehicle according to an embodiment of the present invention, which adaptively adjusts the brightness of a liquid crystal screen display screen according to a temperature range in which the liquid crystal screen cannot work at all;

[0065] Fig. 9 This is a schematic diagram of the structure of a temperature adaptive control system for a liquid crystal screen for a special vehicle according to an embodiment of the present invention;

[0066] Fig.10 The figure is a schematic diagram of the physical structure of an electronic device according to an embodiment of the present invention.

[0067] PCB: Printed Circuit Board, printed circuit board.

[0068] Tc: Temperature Case, the case temperature of the component.

[0069] TJ: Temperature Junction, the junction temperature within the component.

[0070] RJA: Junction to Ambient, which indicates the total thermal resistance from the heat source junction (Junction) of the component to the surrounding cooling air (Ambient). The temperature rise of the device is obtained by multiplying it by the heat generated.

[0071] RJC: Junction to Case, which represents the thermal resistance between the heat source junction of the component and the component package shell. Multiplying it by the heat generation gives the temperature difference between the heat source junction and the component package shell. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0073] The flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present invention. Based on this understanding, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and sometimes in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of the boxes in the block diagram and / or the flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0074] like Figure 1-Figure 8 As shown, the first aspect of the present invention provides a method for adaptively controlling the temperature of a liquid crystal display for a special vehicle, comprising the following steps:

[0075] S1: According to the printed circuit board (PCB), components and component selection of the vehicle-mounted LCD screen, the heating coefficient of the components is confirmed to obtain the resistance encountered by the LCD screen components on the heat flow path; the resistance encountered by the components on the heat flow path includes the thermal resistance RCS from the component package shell to the component heat sink, the thermal resistance RSA from the component heat sink to the environment, and the thermal resistance RJA between the component's heat source junction and the environment; the resistance encountered by heat on the heat flow path is the size of the heat transfer capacity between the media, indicating the temperature rise caused by 1W of heat, in units of ℃ / W or K / W. Multiply the thermal power consumption by the thermal resistance to obtain the temperature rise on the heat transfer path;

[0076] S2: Performing thermal simulation on the operation of the LCD screen according to the layout position of the vehicle-mounted LCD screen in the vehicle to obtain a thermal simulation data model of the LCD screen operation (such as Figure 2 shown);

[0077] S3: Obtain the thermal resistance RJC between the heat source junction of the LCD screen component and the component package shell and the power consumption P of the component at room temperature according to the semiconductor device specification;

[0078] S4: Calculate the temperature rise of the components on the heat flow path according to the resistance encountered by the LCD components on the heat flow path, the thermal resistance RJC of the heat source junction of the components and the component packaging shell, and the power consumption P of the LCD components at room temperature;

[0079] S5: Calculate the maximum stable working temperature of the LCD screen components according to the temperature rise of the LCD screen components in the heat flow path (such as Figure 3 As shown); wherein, the LCD screen components include LCD screen components with component heat sinks and LCD screen components without component heat sinks; the LCD screen components without component heat sinks include high-power LCD screen components and low-power LCD screen components;

[0080] For LCD components with component heat sinks, such as the main component MCU of the LCD, the maximum stable operating temperature Tcmax1 of the LCD component is expressed by formula (1):

[0081] Tcmax1=TJ-P*(RJC+RCS+RSA) (1)

[0082] Wherein, TJ is the temperature of the heat source junction of the component; P is the power consumption of the component at room temperature (usually 25°); RJC is the thermal resistance between the heat source junction of the component and the component package shell; RCS is the thermal resistance from the component package shell to the component heat sink; RSA is the thermal resistance from the component heat sink to the environment;

[0083] The thermal resistance between the component package and the environment is calculated by formula (2):

[0084] RCA = RCS + RSA = 0 (2);

[0085] For LCD components without component heat sinks, the maximum stable operating temperature Tcmax2 of high-power LCD components is expressed by formula (3):

[0086] Tcmax2=TJ-P*(RJC+RCA) (3)

[0087] Where: RCA is the thermal resistance between the component package and the environment;

[0088] For LCD components without component heat sinks, the maximum stable operating temperature Tcmax3 of low-power LCD components is expressed by equation (4):

[0089] Tcmax3=TJ-P*RJA (4)

[0090] Among them, RJA is the thermal resistance between the heat source junction of the component and the environment;

[0091] S6: Substituting the maximum stable working temperature of the liquid crystal screen components into the thermal simulation data model to obtain the thermal simulation results of the liquid crystal screen;

[0092] S7: Based on the thermal simulation results of the LCD screen, reverse simulation is performed to obtain the temperature range in which the LCD screen cannot work at all (such as Figure 4 Specific examples include:

[0093] S71: Calculate the maximum stable temperature of the vehicle LCD screen at the highest ambient temperature (such as Figure 5 High temperature results for thermal simulation);

[0094] S72: According to the corresponding heating coefficient of the components at rated power in the component specification, the backlight of the LCD screen is lowered to reduce the actual power of the LCD screen components, so that the components enter the low power consumption mode; according to the reverse simulation of the junction temperature in the component specification, the maximum ambient temperature of the LCD screen when working at the maximum stable temperature is obtained, which is recorded as T1 (such as Figure 6 Improved results for thermal simulations at high temperatures);

[0095] S73: Based on the maximum heat generation coefficient of the component at maximum power in the component specification, the component is simulated and calculated from the lowest operating temperature to a lower temperature step by step, and the lowest operating temperature that the LCD screen can obtain by generating heat when working at a low temperature is obtained, which is recorded as T2 (e.g. Figure 7 Improved results for thermal simulations at low temperatures);

[0096] S74: Obtaining a temperature range in which the LCD screen cannot operate at all according to the maximum ambient temperature of the LCD screen when operating at the maximum stable temperature obtained in step S32 and the lowest operating temperature that can be obtained by generating heat when the LCD screen operates at a low temperature obtained in step S33;

[0097] S8: Adaptively adjust the brightness of the LCD screen according to the temperature range in which the LCD screen cannot work at all, so as to realize the normal display function of the LCD screen in the full-time and full-domain scenarios; specifically, according to the temperature range in which the LCD screen cannot work at all, compare the actual working temperature of the LCD screen with the maximum ambient temperature when the LCD screen works at the maximum stable temperature and the lowest working temperature that can be obtained by heat generation when the LCD screen works at a low temperature, and adaptively adjust the brightness of the LCD screen according to the comparison results, so as to realize the normal display function of the LCD screen in the full-time and full-domain scenarios (such as Figure 8 Specific examples include:

[0098] S81: Detecting and obtaining the actual working temperature of the LCD screen through the temperature sensor on the LCD screen components;

[0099] S82: Determine whether the actual operating temperature of the LCD screen is higher than the maximum ambient temperature when the LCD screen is operating at the maximum stable temperature; if yes, control the LCD screen through software to enter a low power consumption mode and reduce the brightness of the LCD screen, and repeat steps S81 and S82; otherwise, execute the next step;

[0100] S83: Determine whether the actual operating temperature of the LCD screen is lower than the lowest operating temperature that can be obtained by the LCD screen generating heat when operating at a low temperature; if yes, control the LCD screen through software to maximize its screen brightness and enter the maximum power operating state; otherwise, execute the next step;

[0101] S84: Control the LCD display screen through software to make it enter a low power consumption mode and reduce the brightness of the LCD display screen.

[0102] That is, when the actual working temperature of the LCD screen is higher than the maximum ambient temperature T1 when the LCD screen works at the maximum stable temperature, the LCD screen is controlled by software to enter a low power consumption mode and the brightness of the LCD screen is reduced; when the actual working temperature of the LCD screen is lower than the lowest working temperature T2 that can be obtained by generating heat when the LCD screen works in a low temperature state, the LCD screen is controlled by software to enter a maximum power working state; when the actual working temperature of the LCD screen reaches the lowest working temperature T2 that can be obtained by generating heat when the LCD screen works in a low temperature state, the LCD screen is controlled by software to enter a low power consumption mode and the brightness of the LCD screen is reduced; the present invention realizes the normal display function guarantee of the LCD screen in full-time and full-domain scenarios by increasing or decreasing the temperature of the LCD screen backlight itself;

[0103] S9: Conduct a thermal balance test of the scheme described in steps S1 to S8 on the vehicle under high temperature and extreme cold temperature scenarios to verify the accuracy of the scheme.

[0104] The implementation basis of the embodiments of the present invention is to implement programmed processing through a device with a processor function; therefore, in engineering practice, the technical solutions and functions of each embodiment of the present invention can be encapsulated into various modules; based on this reality, such as Fig. 9As shown, the second aspect of the present invention provides a temperature adaptive control system for a liquid crystal screen for a special vehicle, including a liquid crystal screen component thermal resistance acquisition module, which is used to confirm the heating coefficient of the component according to the printed circuit board, components and component selection of the vehicle-mounted liquid crystal screen, and obtain the resistance encountered by the liquid crystal screen component on the heat flow path; a simulation model establishment module, which is used to perform thermal simulation on the operation of the liquid crystal screen according to the layout position of the vehicle-mounted liquid crystal screen in the vehicle to obtain a thermal simulation data model of the liquid crystal screen operation; a component parameter acquisition module, which is used to obtain the thermal resistance between the heat source junction of the liquid crystal screen component and the component packaging shell and the power consumption of the component at room temperature according to the semiconductor device specification; a component temperature rise acquisition module, which is used to calculate the component parameters according to the resistance encountered by the liquid crystal screen component on the heat flow path, the thermal resistance between the heat source junction of the component and the component packaging shell and the power consumption of the liquid crystal screen component at room temperature The temperature rise of the device on the heat flow path; the maximum stable working temperature acquisition module of the components is used to calculate the maximum stable working temperature of the LCD components according to the temperature rise of the LCD components on the heat flow path; the thermal simulation result acquisition module is used to substitute the maximum stable working temperature of the LCD components into the thermal simulation data model to obtain the thermal simulation results of the LCD; the temperature range acquisition module where the LCD screen cannot work at all is used to reversely simulate according to the thermal simulation results of the LCD to obtain the temperature range where the LCD cannot work at all; the LCD full-time domain normal display adjustment module is used to adaptively adjust the brightness of the LCD display screen according to the temperature range where the LCD screen cannot work at all, so as to realize the normal display function of the LCD display screen in full-time and full-domain scenarios; the thermal balance test verification module is used to carry out thermal balance tests of the LCD screen on the vehicle under high temperature and high cold extreme temperature scenarios to verify the accuracy of the solution.

[0105] The determination method of the first aspect of the present invention is implemented by relying on electronic equipment, such as Fig.10 As shown, the third aspect of the present invention provides an electronic device, comprising: at least one processor, a communication interface, at least one memory and a communication bus, wherein at least one processor, the communication interface and at least one memory communicate with each other through the communication bus; at least one processor can call the logic instructions in at least one memory to execute all or part of the steps of the methods provided by the aforementioned method embodiments; that is, the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the temperature adaptive control method of the liquid crystal screen for special vehicles provided by any one of the various implementation methods of the first aspect.

[0106] The logic instructions in at least one of the above-mentioned memories can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the fourth aspect of the present invention provides a non-transitory computer-readable storage medium, which is used to store computer instructions, and the computer executes the temperature adaptive control method of the liquid crystal screen for special vehicles provided by any one of the various implementations of the first aspect through computer instructions; the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each method embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0107] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. A person of ordinary skill in the art can understand and implement it without creative labor. Through the description of the above implementation methods, a person of ordinary skill in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware. Based on such an understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiment.

[0108] The method for adaptive temperature control of a liquid crystal screen for special vehicles provided by the present invention optimizes and controls the driving circuit under low temperature and high temperature conditions, performs algorithm simulation calibration and simulation calculation in an ultra-wide temperature range, thereby realizing adaptive adjustment of the brightness of the liquid crystal display screen, and realizing normal display function guarantee of the liquid crystal display screen in all-time and all-domain scenarios by increasing or decreasing the temperature of the screen backlight itself; the present invention performs optimized design in the early stage of development of the on-board display and control system, realizes reasonable front-end design by optimizing circuit design, algorithm control, and simulation verification, and avoids matching difficulties and reliability risks of the back-end vehicle installation system.

[0109] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A temperature adaptive control method for a liquid crystal display screen for a special vehicle, characterized in that: The steps include: S1: Determine the heating coefficient of the components according to the printed circuit board, components and component selection of the vehicle-mounted LCD screen, and obtain the resistance encountered by the LCD screen components in the heat flow path; S2: performing thermal simulation on the operation of the LCD screen according to the arrangement position of the vehicle-mounted LCD screen in the vehicle to obtain a thermal simulation data model of the operation of the LCD screen; S3: Obtain the thermal resistance between the heat source junction of the LCD component and the component package shell and the power consumption of the component at room temperature according to the semiconductor device specification; S4: Calculating the temperature rise of the components on the heat flow path according to the resistance encountered by the LCD components on the heat flow path, the thermal resistance between the heat source junction of the components and the component packaging shell, and the power consumption of the LCD components at room temperature; S5: Calculating the maximum stable operating temperature of the LCD components according to the temperature rise of the LCD components in the heat flow path; S6: Substituting the maximum stable working temperature of the liquid crystal screen components into the thermal simulation data model to obtain the thermal simulation results of the liquid crystal screen; S7: reversely simulate according to the thermal simulation result of the LCD screen to obtain the temperature range in which the LCD screen cannot work at all; S8: Adaptively adjust the brightness of the LCD screen according to the temperature range where the LCD screen cannot work at all, so as to realize the normal display function of the LCD screen in all-time and all-domain scenarios; S9: Conduct a thermal balance test of the scheme of steps S1 to S8 on the vehicle under high temperature and extreme cold temperature scenarios to verify the accuracy of the scheme.

2. The method for adaptively controlling the temperature of a liquid crystal display for a special vehicle according to claim 1, characterized in that: The acquisition of the temperature range in which the liquid crystal screen cannot work at all in step S7 includes: S71: Calculate the maximum stable temperature of the vehicle LCD screen at the highest ambient temperature; S72: According to the heat generation coefficient of the components at rated power in the component specification, the backlight of the LCD screen is lowered to reduce the actual power of the LCD screen components, so that the components enter the low power consumption mode; according to the reverse simulation of the junction temperature in the component specification, the maximum ambient temperature of the LCD screen when working at the maximum stable temperature is obtained; S73: Based on the maximum heat generation coefficient of the component at maximum power in the component specification, the component is simulated and calculated from the lowest operating temperature to a lower temperature step by step, and the lowest operating temperature that can be obtained by heat generation when the LCD screen works at a low temperature is obtained; S74: Obtain a temperature range in which the LCD screen cannot operate at all according to the maximum ambient temperature when the LCD screen operates at the maximum stable temperature and the lowest operating temperature that can be obtained by generating heat when the LCD screen operates at a low temperature.

3. The temperature adaptive control method of a liquid crystal display for a special vehicle according to claim 2, characterized in that: Step S8 also includes: S81: Detecting and obtaining the actual working temperature of the LCD screen through the temperature sensor on the LCD screen components; S82: Determine whether the actual operating temperature of the LCD screen is higher than the maximum ambient temperature when the LCD screen is operating at the maximum stable temperature; if yes, control the LCD screen through software to enter a low power consumption mode and reduce the brightness of the LCD screen, and repeat steps S81 and S82; otherwise, execute the next step; S83: Determine whether the actual operating temperature of the LCD screen is lower than the lowest operating temperature that can be obtained by the LCD screen generating heat when operating at a low temperature; if yes, control the LCD screen through software to maximize its screen brightness and enter the maximum power operating state; otherwise, execute the next step; S84: Control the LCD display screen through software to make it enter a low power consumption mode and reduce the brightness of the LCD display screen.

4. The method for adaptively controlling the temperature of a liquid crystal display for a special vehicle according to any one of claims 1 to 3, characterized in that: The LCD screen components in step S1 include LCD screen components with component heat sinks and LCD screen components without component heat sinks; the LCD screen components without component heat sinks include high-power LCD screen components and low-power LCD screen components.

5. The method for adaptively controlling the temperature of a liquid crystal display for a special vehicle according to claim 4, characterized in that: For LCD components with component heat sinks, the maximum stable operating temperature Tcmax1 of the LCD components is expressed by formula (1): Tcmax1=TJ-P*(RJC+RCS+RSA) (1) Among them, TJ is the temperature of the heat source junction of the component; P is the power consumption of the component at room temperature; RJC is the temperature difference between the heat source junction of the component and the component package shell; RCS is the thermal resistance from the component package shell to the component heat sink; RSA is the thermal resistance from the component heat sink to the environment; The thermal resistance RCA between the component package and the environment is calculated by formula (2): RCA=RCS+RSA=0(2).

6. The method for adaptively controlling the temperature of a liquid crystal display for a special vehicle according to claim 5, characterized in that: For LCD components without component heat sinks, the maximum stable operating temperature Tcmax2 of high-power LCD components is expressed by formula (3): Tcmax2=TJ-P*(RJC+RCA) (3) Where: RCA is the thermal resistance between the component package and the environment.

7. The temperature adaptive control method of a liquid crystal display for a special vehicle according to claim 6, characterized in that: For LCD components without component heat sinks, the maximum stable operating temperature Tcmax3 of low-power LCD components is expressed by equation (4): Tcmax3=TJ-P*RJA(4) Among them, RJA is the thermal resistance between the heat source junction of the component and the environment.

8. A temperature adaptive control system for a liquid crystal screen for a special vehicle, characterized in that: A method for implementing a temperature adaptive control method of a liquid crystal display for a special vehicle according to any one of claims 1 to 7, comprising: The LCD screen component thermal resistance acquisition module is used to confirm the heating coefficient of the components according to the printed circuit board, components and component selection of the vehicle-mounted LCD screen, and obtain the resistance encountered by the LCD screen components in the heat flow path; A simulation model building module is used to perform thermal simulation on the operation of the LCD screen according to the arrangement position of the vehicle-mounted LCD screen in the vehicle to obtain a thermal simulation data model of the LCD screen operation; The component parameter acquisition module is used to obtain the thermal resistance between the heat source junction of the LCD component and the component package shell and the power consumption of the component at room temperature according to the semiconductor device specification; Component temperature rise acquisition module, used to calculate the temperature rise of components on the heat flow path according to the resistance encountered by LCD components on the heat flow path, the thermal resistance between the heat source junction of the components and the component packaging shell, and the power consumption of the LCD components at room temperature; A maximum stable working temperature acquisition module for components, used to calculate the maximum stable working temperature of the LCD components according to the temperature rise of the LCD components in the heat flow path; A thermal simulation result acquisition module is used to substitute the maximum stable temperature of the LCD screen components into the thermal simulation data model to obtain the thermal simulation results of the LCD screen; A temperature range acquisition module where the LCD screen cannot work at all, used for reverse simulation based on the thermal simulation result of the LCD screen to obtain the temperature range where the LCD screen cannot work at all; The LCD screen full-time domain normal display adjustment module is used to adaptively adjust the brightness of the LCD screen according to the temperature range in which the LCD screen cannot work at all, so as to realize the normal display function of the LCD screen in full-time and full-domain scenarios; and The thermal balance test verification module is used to carry out thermal balance tests on the LCD screen on the vehicle under high temperature and high cold extreme temperature scenarios to verify the accuracy of the solution.

9. An electronic device, characterized in that: include: At least one processor, at least one memory and a communication interface; wherein, The processor, memory and communication interface communicate with each other; The memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the temperature adaptive control method of the liquid crystal screen for special vehicles according to any one of claims 1-7.

10. A non-transitory computer-readable storage medium, characterized in that: The non-transitory computer-readable storage medium stores computer instructions, and the computer instructions enable the computer to execute the temperature adaptive control method of the liquid crystal screen for special vehicles as described in any one of claims 1-7.

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