Low-temperature heating display screen structure for electronic rearview mirror

Abstract

The utility model relates to a low-temperature heating display screen structure used on an electronic rearview mirror. The low-temperature heating display screen structure at least comprises a control mainboard, a backlight, a substrate liquid crystal, a bonding material, CG glass and an MCU microcontroller. The heating display screen is formed by combining and connecting CG glass, an OCA attaching material, an electric heating layer, an OCA attaching material, a display screen substrate liquid crystal and a backlight module in sequence from front to back into a whole. The electric heating layer is composed of a heating cover plate, a PET film material and a thermistor. The heating cover plate is rectangular, the PET film material is installed on the heating cover plate and attached to the heating cover plate, and the thermistors are installed on the four edges of the heating cover plate. The liquid crystal heating device can quickly heat liquid crystal in a low-temperature environment, can effectively heat the liquid crystal on the whole display screen, ensures the arrangement uniformity and fluidity of liquid crystal molecules, further can effectively solve the problems of image residue, black screen, slow response and the like when the external environment temperature of the display screen is relatively low, and improves the quality of the display screen. And the safety of the driver is ensured.

Description

Technical Field

[0001] The utility model relates to a low-temperature heating display screen structure for an electronic rearview mirror, belonging to the field of electronic display devices. Background Art

[0002] The replacement of physical rearview mirrors by electronic rearview mirrors has become a development trend. Due to the reflection angle of the lens and the display area of traditional automotive exterior rearview mirrors, visual blind spots will occur when the driver views the rearview mirror, affecting the view of the vehicle's rear. At the same time, in bad weather, traditional exterior rearview mirrors will form frost or water vapor on the lens due to weather or temperature changes, affecting the driver's vision and posing a great potential safety hazard.

[0003] In electronic rearview mirrors, since the display screen components in the current display system are mostly used for liquid crystal displays, the operating temperature of in-vehicle liquid crystal displays is -30°C to 85°C. Considering the inherent physical properties of liquid crystals, the movement of liquid crystal molecules becomes relatively slow in a low-temperature environment, thus affecting the display effect, that is, picture ghosting (the delay time increases). As the key core device for visual perception in an electronic rearview mirror, since the display screen is installed inside the vehicle, especially in extremely cold or colder regions in the north, when the vehicle is parked outdoors for a long time and the driver starts the vehicle for the first time, it is necessary to wait until the ambient temperature of the in-vehicle air conditioner reaches above -10°C to eliminate the picture ghosting phenomenon of the display screen. During this period, the driver's waiting time is relatively long.

[0004] Currently, the solutions to the above problems of low-temperature liquid crystal screens in the industry are as follows: One is to customize a wider-temperature liquid crystal, which is relatively expensive, and at the same time, the comprehensive parameter performance of the display screen will decline, making mass production difficult; the other is to heat the liquid crystal by increasing the backlight brightness and relying on the heat radiation of the backlight. Since the heat source is far from the liquid crystal, the heating efficiency is low, the system power consumption increases sharply, and the life of the backlight lamp beads is reduced. The third is to wrap the liquid crystal screen with thermal insulation materials to prevent the direct impact of low temperature on the liquid crystal screen. The size of the display screen will increase, and the effect is not significant during cold start in extremely cold weather. Summary of the Invention

[0005] The utility model provides a low-temperature heating display screen structure for an electronic rearview mirror to solve the above problems existing in the prior art. The utility model can quickly heat the liquid crystal in a low-temperature environment, effectively heat the liquid crystal of the entire display screen, and ensure the uniformity and fluidity of the arrangement of liquid crystal molecules.

[0006] To achieve the above object, the technical solution provided by the present utility model is: a low-temperature heating display screen structure for an electronic rearview mirror, which at least includes a control main board, a backlight, a substrate liquid crystal, a bonding material, a CG glass, and an MCU microcontroller; the heating display screen is sequentially combined and connected into an integral whole from front to back by a CG glass, an OCA bonding material, an electric heating layer, an OCA bonding material, a display screen substrate liquid crystal, and a backlight module; the electric heating layer is composed of a heating cover plate, a PET film material, and a thermistor; the heating cover plate is rectangular, the PET film material is installed on the heating cover plate and is bonded to the heating cover plate, and the thermistor is installed on the four sides of the heating cover plate.

[0007] Moreover, the heating cover plate of the electric heating layer is connected to the control main board through an FPC cable.

[0008] Moreover, there are four thermistors, which are respectively installed in the middle of the four sides of the heating cover plate.

[0009] Moreover, PIN pins are provided below the electric heating layer for receiving electric heating signals.

[0010] Moreover, the heating network of the electric heating layer adopts a parallel connection method.

[0011] According to the above technical solution, a low-temperature heating display screen structure for an electronic rearview mirror provided by the present utility model has the following advantages compared with the prior art:

[0012] (1) The technical solution adopted by the present utility model installs the electric heating layer between the display screen liquid crystal substrate and the CG glass, which can quickly heat the liquid crystal in a low-temperature environment, effectively heat the liquid crystal of the entire display screen, ensure the uniformity and fluidity of the arrangement of liquid crystal molecules, and thus can effectively address problems such as image retention, black screen, and slow response of the display screen when the external environmental temperature is relatively low, ensuring the safety of the driver.

[0013] (2) The technical solution adopted by the present utility model introduces temperature sensing and control technology, uses an NTC thermistor to monitor the temperature of the cover plate and adjust the heating level, keeps the working temperature of the display screen always within the expected range, realizes two heating control methods of automatic and manual, enhances the convenience and flexibility of user operation, and improves the service life of the display screen.

[0014] (3) The technical solution adopted by the present utility model has a simple structure, low cost, and is easy to implement and maintain. At the same time, the heating network adopting a parallel connection method provides a higher heating power, making the heating process faster and more uniform. Description of the Drawings

[0015] Figure 1 Front view of the display screen;

[0016] Figure 2 Side view and partial enlarged view of the display screen;

[0017] Figure 3 Rear view of the display screen;

[0018] Figure 4 Temperature control principle;

[0019] Figure 5 Heating circuit diagram.

[0020] In the figure: 1. CG glass; 2. OCA bonding material; 3. Electric heating layer; 4. OCA bonding material; 5. Liquid crystal and backlight module of the display screen substrate; 6. PIN pin; 7. Heating cover plate; 8. Thermistor; 9. FPC cable. Specific implementation mode

[0021] The following combines the attached drawings and specific embodiments to make a detailed and specific description of the present utility model, but the protection scope of the present utility model is not limited to the following embodiments.

[0022] In the technical solution provided by the present utility model, a low-temperature heating display screen structure for an electronic rearview mirror includes at least a control main board, a backlight, a substrate liquid crystal, a bonding material, a CG glass, and an MCU microcontroller; as Figure 1 、 Figure 2 and Figure 3 shown, the heating display screen is sequentially combined and connected into a whole from front to back by a CG glass 1, an OCA bonding material 2, an electric heating layer 3, an OCA bonding material 4, a liquid crystal and backlight module 5 of the display screen substrate; the electric heating layer is composed of a heating cover plate 7, a PET film material, and a thermistor 8; the heating cover plate is rectangular, the PET film material is installed on the heating cover plate 7 and is attached to the heating cover plate 7, and the thermistor 8 is installed on the four sides of the heating cover plate 7.

[0023] Moreover, the heating cover plate of the electric heating layer is connected to the control main board through an FPC cable 9.

[0024] Moreover, there are four thermistors, which are respectively installed in the middle of the four sides of the heating cover plate.

[0025] Moreover, a PIN pin 6 is provided below the electric heating layer for receiving an electric heating signal.

[0026] Moreover, the heating network of the electric heating layer adopts a parallel connection method.

[0027] As Figure 4As shown, in a low-temperature environment, after the PIN pin 6 of the electric heating layer receives an electric heating signal, a 24V voltage is input through the main control board. After the power supply of the electric heating layer 3 is turned on, heat is evenly generated. The generated heat is transferred to the CG glass 1 and the liquid crystal of the display screen substrate 5 through the OCA bonding materials 2 and 4 on the upper and lower sides respectively. The heat is effectively transferred to the liquid crystal of the display screen substrate, effectively preventing the reduction of the fluidity of liquid crystal molecules in a low-temperature environment, unstable and uneven arrangement, which affects the response speed and refresh rate of the liquid crystal screen, resulting in problems such as image retention, black screen, and slow response. At the same time, considering the impact of long-term heating on the life of the display screen, a certain heating time is set, which can either automatically stop after a certain heating time or be manually turned on / off by a button for the display screen heating.

[0028] In this embodiment, the model of the control main board is CMS_MB_V1.0, and the model of the MCU microcontroller is R7F7016923A. As Figure 5 shown, the heating network adopts a parallel connection method, with a higher heating power. Four thermistors 8 are installed around the heating cover 7. The resistance value of the thermistor 8 will change according to the temperature change of the heating cover 7. The heating cover 7 is connected to the control main board through an FPC cable. When the control main board is working, the MCU microcontroller continuously detects the resistance values of the four thermistors 8 on the heating cover 7, converts the resistance values of the thermistors 8 into corresponding temperatures. When the temperature is lower than T1 °C, the MCU microcontroller turns on the heating drive circuit module to heat the heating cover. When it is detected that the temperatures of the four thermistors on the cover are all higher than T2 °C, the MCU microcontroller turns off the heating drive circuit module to stop heating, ensuring that the working temperature of the display screen is always within the expected temperature range.

Claims

1. A low-temperature heating display screen structure for an electronic rearview mirror, comprising at least a control main board, a backlight, a substrate liquid crystal, a bonding material, a CG glass, and an MCU microcontroller, characterized in that: The heated display screen is connected as a whole from front to back by a CG glass, an OCA bonding material, an electric heating layer, an OCA bonding material, a display substrate liquid crystal, and a backlight module in combination; the electric heating layer is composed of a heating cover plate, a PET film material, and a thermistor; the heating cover plate is rectangular, the PET film material is installed on the heating cover plate and fits with the heating cover plate, and the thermistor is installed on the four sides of the heating cover plate.

2. The low-temperature heating display screen structure for an electronic rearview mirror according to claim 1, wherein: The heating cover plate of the electric heating layer is connected to the control main board through an FPC cable.

3. The low-temperature heating display screen structure for an electronic rearview mirror according to claim 1, wherein: There are four thermistors, which are respectively installed in the middle of the four sides of the heating cover plate.

4. The low-temperature heating display screen structure for an electronic rearview mirror according to claim 1, characterized in that: PIN pins are provided below the electric heating layer for receiving electric heating signals.

5. The low-temperature heating display screen structure for an electronic rearview mirror according to claim 1, characterized in that: The heating network of the electric heating layer adopts a parallel connection method.

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