Low-temperature starting circuit and display device

Abstract

The utility model discloses a low-temperature starting circuit and a display device, and the circuit comprises a temperature detection module which obtains temperature data, and a micro-control module which receives the temperature data and generates a control signal or adjusts the resistance value of an adjustable resistor. The power supply module is used for receiving a control signal to generate an output voltage or generating the output voltage according to the resistance value of the adjustable resistor, a first end of the micro-control module is connected with a second end of the temperature detection module, and the micro-control module comprises the adjustable resistor; the first end of the power module is connected with the second end of the micro-control module, and the first end of a display device in the vehicle is connected with the second end of the power module. According to the low-temperature starting circuit and the display device provided by the invention, through the low-temperature starting circuit capable of automatically adjusting the power, the display device with the heating layer can have different heating powers at different environment temperatures.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to a low-temperature start-up circuit and display device. Background Technology

[0002] The relationship between in-vehicle displays and temperature during startup is a significant technical issue, especially in cold climates. In low temperatures, in-vehicle displays may be affected, exhibiting problems such as slower screen response, blurry images, or freezing. This can impact the driver's ability to access and operate vehicle information, thereby reducing driving safety.

[0003] To address this issue, some vehicle manufacturers have begun developing display technologies designed for low-temperature environments. One solution involves using special screen materials and liquid crystal display technology, enabling the display to function properly even at low temperatures.

[0004] In addition, some vehicle displays are equipped with heating functions, which automatically heat up upon startup to ensure proper screen operation. However, these heated displays typically use a fixed heating power, resulting in varying performance under different ambient temperatures. Utility Model Content

[0005] In view of the above problems, the purpose of this utility model is to provide a low-temperature start-up circuit and a display device. Through the low-temperature start-up circuit that can automatically adjust the power, the display device with a heating layer can have different heating powers at different ambient temperatures.

[0006] According to one aspect of this utility model, a low-temperature start-up circuit is provided for a display device in a vehicle, comprising: a temperature detection module for acquiring temperature data; a microcontroller module for receiving the temperature data and generating a control signal or adjusting the resistance value of an adjustable resistor; and a power supply module for receiving the control signal and generating an output voltage or generating an output voltage according to the resistance value of the adjustable resistor, wherein a first terminal of the microcontroller module is connected to a second terminal of the temperature detection module, and the microcontroller module includes the adjustable resistor; a first terminal of the power supply module is connected to a second terminal of the microcontroller module, and a first terminal of the display device in the vehicle is connected to a second terminal of the power supply module.

[0007] Optionally, the power module includes: a vehicle power supply providing a base voltage, the base voltage being a fixed value; and a boost converter connected to the vehicle power supply and the microcontroller module.

[0008] Optionally, the power module includes: a vehicle power supply providing a base voltage, the base voltage being a fixed value; and a Buck step-down unit connected to the vehicle power supply and the microcontroller module.

[0009] Optionally, the Boost converter is connected to the microcontroller module via an I2C bus, and the microcontroller module provides control signals to the Boost converter; or the Buck converter is connected to the microcontroller module via an I2C bus, and the microcontroller module provides control signals to the Buck converter.

[0010] Optionally, the Boost converter includes: a first resistor, with a first end connected to ground; a first operational amplifier, with its non-inverting input connected to a reference signal and its negative input connected to a second end of the first resistor; a second operational amplifier, with its negative input connected to the output of the first operational amplifier; an oscillator, with its output connected to the non-inverting input of the second operational amplifier; a second resistor, with its first end connected to the second end of the first resistor and its second end connected to the first end of the adjustable resistor in the microcontroller module; a first switching transistor, with its second end connected to ground and its control terminal connected to the output of the second operational amplifier; a first inductor, with its first end connected to the output of the vehicle power supply and its second end connected to the first end of the first switching transistor; a first diode, with its first end connected to the first end of the first switching transistor and its second end connected to the heating layer; and a first capacitor, with its first end connected to the second end of the first diode and its second end connected to ground, wherein the second end of the first diode is also connected to the second end of the adjustable resistor in the microcontroller module.

[0011] Optionally, the Buck step-down unit includes: a step-down chip, the step-down chip having five terminals: a first terminal is a voltage input terminal connected to the output terminal of the vehicle power supply, a second terminal is an enable terminal connected to the first terminal, a third terminal is an output terminal, a fourth terminal is a feedback terminal, and a fifth terminal is a ground terminal; a second capacitor, the first terminal of the second capacitor being connected to the first terminal of the step-down chip, and the second terminal being connected to the ground terminal; a second inductor, the first terminal of the second inductor being connected to the third terminal of the step-down chip, and the second terminal being connected to the heating layer; a fourth resistor, the first terminal of the fourth resistor being connected to the second terminal of the adjustable resistor, and the second terminal being connected to the fourth terminal of the step-down chip; a fifth resistor, the first terminal of the fifth resistor being connected to the second terminal of the fourth resistor, and the second terminal being connected to the ground terminal; a third capacitor, the first terminal of the third capacitor being connected to the second terminal of the second inductor, and the second terminal being connected to the ground terminal, wherein the first terminal of the adjustable resistor is connected to the second terminal of the second inductor.

[0012] Optionally, the adjustable resistor includes: multiple switches, each switch including one input terminal and two output terminals, the multiple switches being cascaded sequentially, the input terminal of the switch in the later stage being connected to the output terminal of the switch in the previous stage, and the two output terminals of one switch in the previous stage being respectively connected to the input terminals of two switches in the later stage; multiple series-connected resistance sections, except for the last resistance section, the two ends of all the resistance sections are sequentially connected to the multiple output terminals of the multiple switches in the last stage, wherein the input terminal of the first stage switch is the first terminal of the adjustable resistor, the second terminal of the last resistance section is the second terminal of the adjustable resistor, and the microcontroller module selects the conduction position of each stage switch according to the temperature data, so that the resistance between the first terminal and the second terminal of the adjustable resistor is different when the temperature data is different.

[0013] Optionally, all of the multiple switches are single-pole double-throw switches.

[0014] Optionally, the temperature detection module includes a temperature sensor.

[0015] According to another aspect of the present invention, a display device is provided, including the low-temperature start-up circuit described above.

[0016] The low-temperature start-up circuit and display device provided by this utility model include a temperature detection module that detects the ambient temperature of the area where the display device is located to obtain temperature data, a microcontroller module that receives the temperature data and generates a control signal or adjusts the resistance value of an adjustable resistor, and a power supply module that generates an output voltage according to the control signal or the resistance value of the adjustable resistor. Therefore, by utilizing the vehicle power supply, the low-temperature start-up circuit provides different voltages to the heating layer for different ambient temperatures, thereby enabling the display device with the heating layer to have different heating powers at different ambient temperatures.

[0017] Furthermore, for vehicle power supplies with different voltages and / or currents, low-temperature start-up circuits with different designs can be used. By using a Buck or Boost unit to adjust the voltage or current supplied by the vehicle power supply to adapt to the ambient temperature, different voltages can be automatically output, thereby enabling the display device with a heating layer to have different heating power at different ambient temperatures. Attached Figure Description

[0018] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

[0019] Figure 1 A structural diagram of a vehicle display device according to an embodiment of the present invention is shown;

[0020] Figure 2 A schematic diagram illustrating the heating principle of a vehicle display device according to an embodiment of the present invention is shown;

[0021] Figure 3 A structural diagram of a low-temperature start-up circuit according to an embodiment of the present invention is shown;

[0022] Figure 4 A flowchart of the low-temperature start-up circuit according to an embodiment of the present invention is shown;

[0023] Figure 5 A structural diagram of a low-temperature start-up circuit according to a first embodiment of the present invention is shown;

[0024] Figure 6 A structural diagram of a low-temperature start-up circuit according to a second embodiment of the present invention is shown;

[0025] Figure 7 A structural diagram of a low-temperature start-up circuit according to a third embodiment of the present invention is shown;

[0026] Figure 8 A structural diagram of a low-temperature start-up circuit according to a fourth embodiment of the present invention is shown;

[0027] Figure 9 Partial structural diagrams of the microcontroller module in the low-temperature start-up circuit according to the second and fourth embodiments of the present invention are shown;

[0028] Figure 10 A power-temperature diagram of the heating layer of a low-temperature start-up circuit according to an embodiment of the present invention is shown. Detailed Implementation

[0029] Various embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0030] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0031] Figure 1 A structural diagram of a vehicle display device according to an embodiment of the present invention is shown; Figure 2 A schematic diagram illustrating the heating principle of a vehicle display device according to an embodiment of the present invention is shown.

[0032] refer to Figure 1 The display device 100 inside the vehicle comprises, from bottom to top: a thin-film transistor electrode layer (TFT Pol) 110, a thin-film transistor layer (TFT glass) 120, a color filter layer (CF glass) 130, a heating layer (ITO heating layer) 140, and a color filter electrode layer (CF Pol) 150. Furthermore, the display device 100 also includes a flexible circuit board 160 and a conductive layer 170 connecting the flexible circuit board 160 and the color filter electrode layer 150.

[0033] The heating layer 140 is made of materials such as indium tin oxide, and is connected to the vehicle's power supply. Given a fixed current or voltage output from the vehicle's power supply and a fixed resistance value for the heating layer 140, the power can be calculated using the formula P=U. 2 As can be seen from / R, the heating power of the heating layer 140 is fixed, such as Figure 2 As shown.

[0034] However, the required heating power varies depending on the ambient temperature. For example, a higher heating power is desired when the ambient temperature is low, while a lower heating power is desired when the ambient temperature is not too low. Therefore, it is desirable for the voltage or current applied to the heating layer 140 to be automatically adjusted according to the ambient temperature.

[0035] This application provides a low-temperature start-up circuit, for example, located on the flexible circuit board 160 of the display device and connected to the heating layer 140 of the display device, for providing different voltages to the heating layer 140 according to the ambient temperature, so as to realize automatic power adjustment according to the ambient temperature, such as... Figure 10 As shown.

[0036] Figure 3 A structural diagram of a low-temperature start-up circuit according to an embodiment of the present invention is shown; Figure 4 A flowchart of the low-temperature start-up circuit according to an embodiment of the present invention is shown.

[0037] refer to Figure 3 and Figure 4 The low-temperature start-up circuit 200 of this application includes a temperature detection module 210 for acquiring temperature data, a microcontroller module 220 for receiving temperature data and generating control signals or adjusting the resistance value of an adjustable resistor, and a power supply module 230 for receiving control signals and generating output voltage or generating output voltage according to the resistance value of the adjustable resistor. The input terminal of the microcontroller module 220 is connected to the output terminal of the temperature detection module 210, and the microcontroller module 220 includes an adjustable resistor. The input terminal of the power supply module 230 is connected to the output terminal of the microcontroller module 220, and the input terminal of the heating layer 140 of the display device is connected to the output terminal of the power supply module 230.

[0038] Specifically, the operating steps of the low-temperature start-up circuit 200 include:

[0039] Step S201: The temperature detection module detects and obtains temperature data.

[0040] In this step, the temperature detection module 210 is used to detect the ambient temperature to obtain temperature data. Specifically, the temperature detection module 210 includes, for example, a temperature sensor, whose thermocouple is located near the display device 100 to detect the ambient temperature near the display device 100 and obtain temperature data.

[0041] Step S202: The microcontroller module generates a control signal or adjusts the resistance value of the variable resistor based on the temperature data.

[0042] In this step, the microcontroller module 220 is connected to the temperature detection module 210 and is used to generate corresponding control signals or adjust the resistance value of the variable resistor based on the temperature data. That is, the microcontroller module 220 generates two outputs based on the temperature data: one is to output a control signal, and the other is to adjust the resistance value of the variable resistor.

[0043] Therefore, in this application, based on the output of the microcontroller module 220, there are two specific embodiments: one is a program control embodiment that generates a control signal so that the power supply module 230 outputs voltage according to the control signal; the other is a non-program control embodiment that adjusts the resistance value of the variable resistor.

[0044] Specifically, in the program-controlled embodiment, the control signals generated by the microcontroller module 220 are transmitted via the I2C bus.

[0045] In a non-programmable control embodiment, the microcontroller module 220 has a variable resistor, and the microcontroller module 220 adjusts the resistance value of the variable resistor according to temperature data.

[0046] Step S203: The power module 230 generates an output voltage based on the control signal or the resistance value of the variable resistor.

[0047] In this step, the power module 230 is connected to the microcontroller module 220 and is used to output the corresponding voltage according to the control signal generated by the microcontroller module 220, or to output the corresponding voltage through a variable resistor whose resistance value is adjusted by the microcontroller module 220.

[0048] Specifically, in the program-controlled embodiment, the power module 230 selectively turns on its internal circuitry based on the control signal generated by the microcontroller module 220, enabling the power module 230 to output an output voltage that matches the control signal. In this embodiment, the magnitude of the output voltage from the power module 230 varies depending on the control signal.

[0049] In the non-programmable control embodiment, the two ends of the variable resistor in the microcontroller module 220 are connected to the circuit structure in the power supply module 230. Since the microcontroller module 220 adjusts the resistance value of the variable resistor based on temperature data, the output voltage of the power supply module 230 also changes. Therefore, when the microcontroller module 220 adjusts the variable resistor to different resistance values, the output voltage of the power supply module 230 will also be different.

[0050] Specifically, the lower the ambient temperature, the greater the output voltage generated by the power module 230; the higher the ambient temperature, the smaller the output voltage generated by the power module 230.

[0051] Furthermore, the power module 230 may employ a Buck buck converter or a Boost converter.

[0052] Step S204: The heating layer of the display device is heated according to the output voltage.

[0053] In this step, the heating layer 140 in the display device 100 is connected to the power module 230 and is heated according to the voltage output by the power module 230 to rapidly and appropriately heat the display device 100. Figure 10 As shown.

[0054] Figure 5 A structural diagram of a low-temperature start-up circuit according to a first embodiment of the present invention is shown.

[0055] refer to Figure 5 In the low-temperature start-up circuit of the first embodiment, a program control method is adopted. Specifically, the low-temperature start-up circuit includes: a temperature detection module 210, a microcontroller module 220, a power supply module 230, and a heating layer 140. Among them, the power supply module 230 includes a vehicle power supply 231 and a Boost converter 232, and the temperature detection module 210 includes a temperature sensor 211.

[0056] Temperature sensor 211 in temperature detection module 210 detects the ambient temperature of the area where display device 100 is located and obtains temperature data. Microcontroller module 220 receives the temperature data and generates a control signal. Vehicle power supply 231 provides base voltage to Boost converter 232. Then, Boost converter 232 modifies the voltage provided by vehicle power supply 231 according to the control signal sent by microcontroller module 220 via I2C bus. That is, in the first embodiment, microcontroller module 220 controls Boost converter 232 to modify the output voltage through a program.

[0057] The I2C (Inter-Integrated Circuit) bus is a serial communication bus used for data transmission between electronic devices. It consists of two lines: a serial data line (SDA) and a serial clock line (SCL). The I2C bus supports multi-master and multi-slave communication, enabling fast and simple communication between devices. On the I2C bus, each device has a unique address, and the master can select the device to communicate with by sending the address. During communication, the master generates a clock signal to control data transmission and reception.

[0058] In this embodiment, the vehicle power supply 231 provides, for example, a base voltage of 12V.

[0059] Figure 6 A structural diagram of a low-temperature start-up circuit according to a second embodiment of the present invention is shown. Compared with the first embodiment, the low-temperature start-up circuit of the second embodiment employs a non-programmed control method.

[0060] refer to Figure 6 The low-temperature start-up circuit of the second embodiment includes a temperature detection module 210, a microcontroller module 220, a power supply module 230, and a heating layer 140. The temperature detection module 210 includes a temperature sensor 211, and the power supply module 230 includes a vehicle power supply 231 and a Boost converter 232. An adjustable resistor R3 in the microcontroller module 220 is connected to the Boost converter 232.

[0061] Specifically, the Boost boost unit 232 includes: a first operational amplifier OP1, a second operational amplifier OP2, an oscillator OSC, a first resistor R1, a second resistor R2, a first switch Q1, a first inductor L1, a first diode D1, and a first capacitor C1.

[0062] The first terminal of the first resistor R1 is connected to the ground terminal GND; the non-inverting input terminal of the first operational amplifier OP1 is connected to the reference signal Vref, and the negative input terminal is connected to the second terminal of the first resistor R1; the non-inverting input terminal of the second operational amplifier OP2 is connected to the oscillator OSC, and the negative input terminal is connected to the output terminal of the first operational amplifier OP1; the first terminal of the second resistor R2 is connected to the second terminal of the first resistor R1, and the second terminal is connected to the first terminal A of the adjustable resistor R3 in the microcontroller module 220; the second terminal of the first switch Q1 is connected to the ground terminal GND, and the control terminal is connected to the output terminal of the second operational amplifier OP2; the first terminal of the first inductor L1 is connected to the output terminal of the vehicle power supply 231, and the second terminal is connected to the first terminal of the first switch Q1; the first terminal of the first diode D1 is connected to the first terminal of the first switch Q1, and the second terminal is connected to the heating layer 140; the first terminal of the first capacitor C1 is connected to the second terminal of the first diode D1, and the second terminal is connected to the ground terminal GND. In addition, the second terminal of the first diode D1 is also connected to the second terminal B of the adjustable resistor R3 in the microcontroller module 220, that is, the adjustable resistor R3 is connected between the second terminal of the second resistor R2 and the output terminal of the Boost boost unit 232.

[0063] In this embodiment, the formula for calculating the output voltage of the Boost converter 232 is as follows:

[0064] Vout=Vref * [1+(R1+R3) / R2],

[0065] In this formula, the reference voltage Vref is 0.6V.

[0066] Specifically, the adjustable resistor R3 in the microcontroller module 220 includes multiple switches and multiple resistance sections. Each switch includes one input terminal and two output terminals. The multiple switches are cascaded sequentially, with the input terminal of a subsequent switch connected to the output terminal of a previous switch, and the two output terminals of a previous switch connected to the input terminals of two switches in the subsequent stage, respectively. The multiple resistance sections are connected in series sequentially, and except for the last resistance section, the two ends of all resistance sections are sequentially connected to the multiple output terminals of the multiple switches in the last stage. The input terminal of the first stage switch is the first terminal of the adjustable resistor R3, and the second terminal of the last resistance section is the second terminal of the adjustable resistor R3. The microcontroller module 220 selects the conduction position of each stage switch according to the temperature data, so that the resistance value between the first and second terminals of the adjustable resistor R3 is different when the temperature data is different.

[0067] Specifically, one embodiment of the adjustable resistor R3 in the microcontroller module 220 has the following structure: Figure 9 As shown. The adjustable resistor R3 consists of seven single-pole double-throw switches and eight resistance sections. Figure 9As shown, the eight resistance sections are connected in series from the first resistance section R31 to the eighth resistance section R38. The node between two adjacent resistance sections is connected to one output terminal of a partial single-pole double-throw switch.

[0068] In this circuit, the input terminal of the first switch S1 serves as the first terminal A of the adjustable resistor R3; the first output terminal a of the first switch S1 is connected to the input terminal of the second switch S2, and the second output terminal b of the first switch S1 is connected to the input terminal of the third switch S3; the first output terminal c of the second switch S2 is connected to the input terminal of the fourth switch S4, and the second output terminal d of the second switch S2 is connected to the input terminal of the fifth switch S5; the first output terminal e of the third switch S3 is connected to the input terminal of the sixth switch S6, and the second output terminal f of the third switch S3 is connected to the input terminal of the seventh switch S7; the first output terminal g of the fourth switch S4 is connected to the first resistance portion R31. One end is connected: the second output terminal h of the fourth switch S4 is connected to the second end of the first resistance section R31; the first output terminal i of the fifth switch S5 is connected to the first end of the third resistance section R33, and the second output terminal j of the fifth switch S5 is connected to the second end of the third resistance section R33; the first output terminal k of the sixth switch S6 is connected to the first end of the fifth resistance section R35, and the second output terminal l of the sixth switch S6 is connected to the second end of the fifth resistance section R35; the first output terminal m of the seventh switch S7 is connected to the first end of the seventh resistance section R37, and the second output terminal n of the seventh switch S7 is connected to the second end of the seventh resistance section R37. The second end of the eighth resistance section R38 serves as the second end B of the adjustable resistor R3.

[0069] In the adjustable resistor R3, the first switch S1 forms one group, the second switch S2 and the third switch S3 form the second group, and the fourth to seventh switches S7 form the third group. When the microcontroller module 220 adjusts the resistance value of the adjustable resistor R3 based on temperature data, it controls the conduction state of the first to seventh switches S7 to control the resistance value of the adjustable resistor R3. By adjusting the conduction direction of the corresponding switches in the three groups, it is possible to control which resistance value portion the first terminal A of the adjustable resistor R3 starts from. Different numbers of resistance value portions between the first terminal A and the second terminal B of the adjustable resistor R3 result in different resistance values ​​for the adjustable resistor R3.

[0070] In one embodiment, when the adjustable resistor R3 is at its maximum value, the input terminal of the first switch S1 is connected to the first output terminal a, the input terminal of the second switch S2 is connected to the first output terminal c, and the input terminal of the fourth switch S4 is connected to the first output terminal g. When the adjustable resistor R3 is at its minimum value, the input terminal of the first switch S1 is connected to the second output terminal b, the input terminal of the third switch S3 is connected to the second output terminal f, and the input terminal of the seventh switch S7 is connected to the second output terminal n.

[0071] In this embodiment, the resistance values ​​of the multiple resistance portions of the adjustable resistor R3 may be the same or different. The vehicle power supply 231 provides, for example, a base voltage of 12V.

[0072] Figure 7 A structural diagram of a low-temperature startup circuit according to a third embodiment of the present invention is shown. Compared with the low-temperature startup circuit of the first embodiment, the power supply module 230 in the third embodiment uses a different circuit structure.

[0073] refer to Figure 7 In the low-temperature start-up circuit of the third embodiment, a program control method is adopted. Specifically, the low-temperature start-up circuit includes: a temperature detection module 210, a microcontroller module 220, a power supply module 230, and a heating layer 140. Among them, the temperature detection module 210 includes a temperature sensor 211, and the power supply module 230 includes a vehicle power supply 231 and a Buck step-down unit 233.

[0074] Temperature sensor 211 in temperature detection module 210 detects the ambient temperature of the area where display device 100 is located and obtains temperature data. Microcontroller module 220 receives the temperature data and generates a control signal. Vehicle power supply 231 provides a base voltage to Buck step-down unit 233. Then, Buck step-down unit 233 modifies the base voltage provided by vehicle power supply 231 according to the control signal sent by microcontroller module 220 via I2C bus. That is, in the third embodiment, microcontroller module 220 controls Buck step-down unit 233 to modify the output voltage through program control.

[0075] In this embodiment, the vehicle power supply 231 provides, for example, a base voltage of 24V.

[0076] Figure 8 A structural diagram of a low-temperature startup circuit according to a fourth embodiment of the present invention is shown. Compared with the second embodiment, the power supply module 230 in the low-temperature startup circuit of the fourth embodiment adopts a different circuit structure.

[0077] refer to Figure 8 The low-temperature start-up circuit of the fourth embodiment includes: a temperature detection module 210, a microcontroller module 220, a power supply module 230, and a heating layer 140. The temperature detection module 210 includes a temperature sensor 211, and the power supply module 230 includes a vehicle power supply 231 and a Buck converter 233. An adjustable resistor R3 in the microcontroller module 220 is connected to the Buck converter 233.

[0078] Specifically, the Buck step-down unit 233 includes: a step-down chip U1, a second capacitor C2, a second inductor L2, a fourth resistor R4, a fifth resistor R5, and a third capacitor C3.

[0079] The step-down chip U1 includes five terminals: the first terminal is the voltage input terminal VIN, which is connected to the output terminal of the vehicle power supply 231; the second terminal is the enable terminal EN, which is connected to the first terminal; the third terminal is the output terminal LX; the fourth terminal is the feedback terminal FB; and the fifth terminal is the ground terminal GND, which is connected to ground GND. The first terminal of the second capacitor C2 is connected to the first terminal of the step-down chip U1, and the second terminal is connected to the ground terminal GND. The first terminal of the second inductor L2 is connected to the third terminal of the step-down chip U1, and the second terminal is connected to the heating layer 140. The first terminal of the fourth resistor R4 is connected to the second terminal B of the adjustable resistor R3, and the second terminal is connected to the fourth terminal of the step-down chip U1. The first terminal of the fifth resistor R5 is connected to the second terminal of the fourth resistor R4, and the second terminal is connected to the ground terminal GND. The first terminal of the third capacitor C3 is connected to the second terminal of the second inductor L2, and the second terminal is connected to the ground terminal GND. The first terminal of the adjustable resistor R3 in the microcontroller module 220 is connected to the second terminal of the second inductor L2, and the second terminal is connected to the first terminal of the fourth resistor R4.

[0080] In this embodiment, the formula for calculating the output voltage of the Buck step-down unit 233 is as follows:

[0081] Vout=Vfb* [1+(R1+R3) / R2],

[0082] In this formula, the feedback voltage Vfb is 0.6V.

[0083] Specifically, the structure of the adjustable resistor R3 in the microcontroller module 220 is as follows: Figure 9 As shown, the relevant descriptions can be found above and will not be repeated here. However, it is understood that the adjustable resistor R3 in both the second and fourth embodiments... Figure 9 Only one possible embodiment is shown. Those skilled in the art can make adaptive modifications to the number of switches and the number of resistance sections as needed, and the resistance value of each resistance section can also be adapted as needed.

[0084] In this embodiment, the vehicle power supply 231 provides, for example, a base voltage of 24V.

[0085] The low-temperature start-up circuit and display device provided by this utility model utilize the vehicle power supply. The low-temperature start-up circuit provides different voltages to the heating layer for different ambient temperatures, thereby enabling the display device with the heating layer to have different heating powers at different ambient temperatures.

[0086] Furthermore, for vehicle power supplies with different voltages and / or currents, low-temperature start-up circuits with different designs can be used. By using a Buck or Boost unit to adjust the voltage or current supplied by the vehicle power supply to adapt to the ambient temperature, different voltages can be automatically output, thereby enabling the display device with a heating layer to have different heating power at different ambient temperatures.

[0087] As described above, these embodiments of the present invention do not exhaustively cover all details, nor do they limit the invention to the specific embodiments described. Clearly, many modifications and variations can be made based on the above description. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to effectively utilize the present invention and its modifications. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low-temperature start-up circuit for a display device inside a vehicle, characterized in that, include: The system includes a temperature detection module for acquiring temperature data, a microcontroller module for receiving the temperature data and generating a control signal or adjusting the resistance value of an adjustable resistor, and a power supply module for receiving the control signal and generating an output voltage or generating an output voltage based on the resistance value of the adjustable resistor. The microcontroller module's input terminal is connected to the temperature detection module's output terminal, and the microcontroller module includes the adjustable resistor; the power supply module's input terminal is connected to the microcontroller module's output terminal, and the vehicle's in-vehicle display device's input terminal is connected to the power supply module's output terminal.

2. The low-temperature start-up circuit according to claim 1, characterized in that, The power module includes: The vehicle power supply provides a base voltage, which is a fixed value. The Boost converter is connected to the vehicle power supply and the microcontroller module.

3. The low-temperature start-up circuit according to claim 1, characterized in that, The power module includes: The vehicle power supply provides a base voltage, which is a fixed value. The Buck step-down unit is connected to the vehicle power supply and the microcontroller module.

4. The low-temperature start-up circuit according to claim 2, characterized in that, The Boost converter is connected to the microcontroller module via an I2C bus, and the microcontroller module provides control signals to the Boost converter.

5. The low-temperature start-up circuit according to claim 3, characterized in that, The Buck step-down unit is connected to the microcontroller module via an I2C bus, and the microcontroller module provides control signals to the Buck step-down unit.

6. The low-temperature start-up circuit according to claim 2, characterized in that, The Boost unit includes: The first resistor, with its first end connected to the ground terminal; A first operational amplifier, wherein the non-inverting input terminal of the first operational amplifier is connected to a reference signal, and the negative input terminal is connected to the second end of the first resistor; A second operational amplifier, wherein the negative input terminal of the second operational amplifier is connected to the output terminal of the first operational amplifier; An oscillator, the output of which is connected to the non-inverting input of the second operational amplifier; The second resistor has a first end connected to the second end of the first resistor, and the second end connected to the first end of the adjustable resistor in the microcontroller module. The first switching transistor has its second terminal connected to the ground terminal and its control terminal connected to the output terminal of the second operational amplifier. A first inductor, with its first end connected to the output terminal of the vehicle power supply and its second end connected to the first end of the first switching transistor; The first diode has a first end connected to the first end of the first switching transistor and a second end connected to the heating layer. A first capacitor, wherein a first terminal of the first capacitor is connected to a second terminal of the first diode, and the second terminal is connected to a ground terminal. The second end of the first diode is also connected to the second end of the adjustable resistor in the microcontroller module.

7. The low-temperature start-up circuit according to claim 3, characterized in that, The Buck step-down unit includes: The step-down chip includes five terminals: the first terminal is the voltage input terminal, which is connected to the output terminal of the vehicle power supply; the second terminal is the enable terminal, which is connected to the first terminal; the third terminal is the output terminal; the fourth terminal is the feedback terminal; and the fifth terminal is the ground terminal. The second capacitor has its first end connected to the first end of the step-down chip and its second end connected to the ground terminal. The second inductor has its first end connected to the third end of the step-down chip and its second end connected to the heating layer. The fourth resistor has its first end connected to the second end of the adjustable resistor, and its second end connected to the fourth end of the step-down chip. The fifth resistor has its first end connected to the second end of the fourth resistor, and its second end connected to the ground terminal. The third capacitor has its first terminal connected to the second terminal of the second inductor, and its second terminal connected to the ground terminal. The first end of the adjustable resistor is connected to the second end of the second inductor.

8. The low-temperature start-up circuit according to claim 6 or 7, characterized in that, The adjustable resistor includes: Multiple switches, each switch including one input terminal and two output terminals, are cascaded in sequence. The input terminal of the switch in the subsequent stage is connected to the output terminal of the switch in the preceding stage, and the two output terminals of the switch in the preceding stage are respectively connected to the input terminals of the two switches in the subsequent stage. The multiple series-connected resistance sections, except for the last one, are sequentially connected at both ends to the multiple output terminals of the multiple switches in the last stage. Wherein, the input terminal of the first-stage switch is the first terminal of the adjustable resistor, and the second terminal of the last resistance value portion is the second terminal of the adjustable resistor. The microcontroller module selects the conduction position of each stage switch according to the temperature data so that the resistance value between the first terminal and the second terminal of the adjustable resistor is different when the temperature data is different.

9. The low-temperature start-up circuit according to claim 8, characterized in that, All of the switches are single-pole double-throw switches.

10. The low-temperature start-up circuit according to claim 1, characterized in that, The temperature detection module includes a temperature sensor.

11. A display device, characterized in that, Includes the low-temperature start-up circuit as described in any one of claims 1-10.

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