阅读说明：本技术 一种对hud进行温度保护的方法 (Method for carrying out temperature protection on HUD ) 是由 汤赵斌 谢建伟 于 2020-12-03 设计创作，主要内容包括：本发明属于HUD车载显示技术领域,尤其为一种对HUD进行温度保护的方法,包括以下步骤：步骤S1、采用TMP75作为温度传感器IC,将温度传感器IC安装于HUD的背光板上；步骤S2、采用12C的方式将温度传感器IC与HUD的MCU连接；步骤S3、在温度传感器IC的公共端上采用电容C1作为旁路电容；步骤S4、设置R3作为上拉电阻；步骤S5、设置R1和R2作为12C的上拉电阻；步骤S6、工作时由温度传感器IC实时输出温度值提供给MCU进行检测,当温度到达85℃时,通过MCU控制背光降低显示亮度,当温度超过105℃时,通过MCU关闭背光。本发明能够实现对HUD温度的调节控制,确保HUD能够在高温条件下正常工作,避免由于高温造成LCD烧屏。(The invention belongs to the technical field of HUD vehicle-mounted display, and particularly relates to a method for carrying out temperature protection on a HUD, which comprises the following steps: step S1, adopting TMP75 as a temperature sensor IC, and installing the temperature sensor IC on a backlight plate of the HUD; step S2, connecting the temperature sensor IC with the MCU of the HUD in a 12C mode; step S3, adopting a capacitor C1 as a bypass capacitor on the common end of the temperature sensor IC; step S4, setting R3 as a pull-up resistor; step S5, setting R1 and R2 as pull-up resistors of 12C; and step S6, outputting a temperature value in real time by the temperature sensor IC during working and providing the temperature value for the MCU for detection, controlling the backlight to reduce the display brightness by the MCU when the temperature reaches 85 ℃, and closing the backlight by the MCU when the temperature exceeds 105 ℃. The invention can realize the adjustment and control of the HUD temperature, ensure that the HUD can normally work under the high-temperature condition and avoid LCD screen burning caused by high temperature.)

1. A method of temperature protecting a HUD, comprising: the method comprises the following steps:

step S1, adopting TMP75 as a temperature sensor IC, and installing the temperature sensor IC on a backlight plate of the HUD;

step S2, connecting the temperature sensor IC with the MCU of the HUD in a 12C mode;

step S3, adopting a capacitor C1 as a bypass capacitor at the common end of the temperature sensor IC to filter the voltage;

step S4, setting R3 as a pull-up resistor, and confirming the default state of the ALERT signal;

step S5, setting R1 and R2 as pull-up resistors of the 12C to ensure that the 12C can normally communicate and work;

and step S6, outputting a temperature value in real time by the temperature sensor IC during working and providing the temperature value for the MCU for detection, controlling the backlight to reduce the display brightness by the MCU when the temperature reaches 85 ℃, and closing the backlight by the MCU when the temperature exceeds 105 ℃.

2. A method of temperature protecting a HUD according to claim 1, wherein: the capacitor C1 is a 0.1uF capacitor.

3. A method of temperature protecting a HUD according to claim 1, wherein: the pull-up resistor R3 is set to a value of 4.7K.

4. A method of temperature protecting a HUD according to claim 1, wherein: the pull-up resistors R1 and R2 are set to a value of 10K.

Technical Field

The invention relates to the technical field of HUD vehicle-mounted display, in particular to a method for carrying out temperature protection on a HUD.

Background

The automobile HUD is a short for automobile head-up display and head-up display. The head-up display system belongs to a head-up display system, namely, a projection is arranged on a front windshield, and the projection can display some information, such as current speed, navigation information and the like, so that the eyes of a driver can always look at the front for driving, the distraction of the driver can be avoided, and the effects of improving the driving safety and convenience are achieved.

Under the irradiation of sunlight, a display screen of the HUD is brighter than the ambient brightness of the outside in the sunlight, and a displayed image can be seen, so that a backlight with high brightness is required to be adopted, the backlight brightness needs to reach at least over 100 ten thousand nits to meet the requirement, and the backlight with high brightness is required to be adopted to reach the high brightness, and the temperature of the backlight is very high. When the temperature rises to a certain degree (the maximum working temperature of the LCD screen), the contrast of the LCD screen in a high-temperature area is reduced to be almost incapable of identifying image information, and the phenomenon is called screen burn-in phenomenon.

Although HUD can avoid driver's attention dispersion when using, improves and drives the security, but current HUD can not normally work under the high temperature condition, easily causes the LCD to burn the screen, can not realize the control regulation to the temperature, and the stability and the reliability of its work can not obtain the guarantee.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a method for protecting the temperature of the HUD, and solves the problems that the conventional HUD cannot normally work under a high-temperature condition, an LCD is easy to burn, the temperature can not be controlled and adjusted, and the working stability and reliability of the HUD cannot be guaranteed.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a method of temperature protecting a HUD comprising the steps of:

step S1, adopting TMP75 as a temperature sensor IC, and installing the temperature sensor IC on a backlight plate of the HUD;

step S2, connecting the temperature sensor IC with the MCU of the HUD in a 12C mode;

step S3, adopting a capacitor C1 as a bypass capacitor at the common end of the temperature sensor IC to filter the voltage;

step S4, setting R3 as a pull-up resistor, and confirming the default state of the ALERT signal;

step S5, setting R1 and R2 as pull-up resistors of the 12C to ensure that the 12C can normally communicate and work;

and step S6, outputting a temperature value in real time by the temperature sensor IC during working and providing the temperature value for the MCU for detection, controlling the backlight to reduce the display brightness by the MCU when the temperature reaches 85 ℃, and closing the backlight by the MCU when the temperature exceeds 105 ℃.

As a preferred technical solution of the present invention, the capacitor C1 is a 0.1uF capacitor.

As a preferred embodiment of the present invention, the pull-up resistor R3 is set to 4.7K.

In a preferred embodiment of the present invention, the pull-up resistors R1 and R2 are set to 10K.

(III) advantageous effects

Compared with the prior art, the invention provides a method for protecting the temperature of the HUD, which has the following beneficial effects:

this method of carrying out temperature protection to HUD, through set up temperature sensing ICTMP75 on board is shaded, adopt electric capacity C1 as bypass capacitance, carry out filtering process to the voltage, set up R3 as pull-up resistance, confirm with acquiescence state to the ALERT signal, set up R1 and R2 as 12C's pull-up resistance, in order to ensure that 12C can normal communication and work, during operation provides MCU by temperature sensor IC real-time output temperature value and detects, when the temperature reachs 85 ℃, reduce through MCU control backlight and show luminance, when the temperature exceedes 105 ℃, close backlight through MCU, realize the regulation and control to the HUD temperature, ensure that D can normally work under the high temperature condition, avoid because high temperature causes HULCD to burn the screen, make HUD's stability and reliability obtain the guarantee.

Drawings

FIG. 1 is a circuit diagram of a temperature sensor IC of the present invention;

FIG. 2 is a schematic representation of the method steps for temperature protection of a HUD according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1-2, the present invention provides the following technical solutions: a method of temperature protecting a HUD comprising the steps of:

step S1, adopting TMP75 as a temperature sensor IC, and installing the temperature sensor IC on a backlight plate of the HUD;

step S2, connecting the temperature sensor IC with the MCU of the HUD in a 12C mode;

step S3, adopting a capacitor C1 as a bypass capacitor at the common end of the temperature sensor IC to filter the voltage;

step S4, setting R3 as a pull-up resistor, and confirming the default state of the ALERT signal;

step S5, setting R1 and R2 as pull-up resistors of the 12C to ensure that the 12C can normally communicate and work;

and step S6, outputting a temperature value in real time by the temperature sensor IC during working and providing the temperature value for the MCU for detection, controlling the backlight to reduce the display brightness by the MCU when the temperature reaches 85 ℃, and closing the backlight by the MCU when the temperature exceeds 105 ℃.

Specifically, the capacitor C1 is a 0.1uF capacitor.

In this embodiment, the capacitor C1 is a 0.1uF capacitor, which can perform a filtering process on the voltage.

Specifically, pull-up resistor R3 is set to a value of 4.7K.

In this embodiment, the pull-up resistor R3 is set to 4.7K, and the default state of the ALERT signal can be confirmed.

Specifically, pull-up resistors R1 and R2 are set to a value of 10K.

In this embodiment, the pull-up resistors R1 and R2 are set to 10K, and normal communication and operation of I2C can be ensured by the setting of the pull-up resistors R1 and R2.

The working principle and the using process of the invention are as follows: according to the invention, TI temperature sensing ICTMP75 is selected and connected with an MCU in an I2C mode, an IC is placed on a backlight board, C1 selects a 0.1uF capacitor as a bypass capacitor to filter voltage, R3 is used as a pull-up resistor with a set value of 4.7K to confirm the default state of an ALERT signal, R1 and R2 are used as pull-up resistors of I2C with a value of 10K to ensure that the I2C can normally communicate and work, the design can output a temperature value in real time to be provided for the MCU to detect, when the temperature reaches 85 degrees, the display brightness is reduced, the system is protected, when the temperature exceeds 105 degrees, the backlight is turned off, and LCD screen burning caused by high temperature is avoided.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.