CN106627376A - Car rearview mirror device capable of automatically adjusting brightness - Google Patents

Abstract

The invention discloses an automobile rearview mirror device for automatically adjusting the brightness. The device realizes that the rearview mirror can quickly and automatically adjust the brightness when the automobile encounters strong light or the ambient light becomes dark, so that the driver can make timely adjustments according to the situation. It responds, and there is an electric heater to eliminate the influence of frost on the rearview mirror. The CPU changes the brightness of the LCD screen through the change of the voltage. The processing process is intelligent, the response is fast, and the brightness is consistent.

Description

A car rearview mirror device with automatic brightness adjustment

technical field

The invention relates to the field of automobiles, in particular to an automobile rearview mirror device for automatically adjusting brightness.

Background technique

In the traditional sense of the car rearview mirror, when the car is driving at night, the lights of the rear vehicles shine on the rearview mirror, and the human eyes will feel dizzy when they see it, which is dangerous to driving. The existing anti-glare rearview mirror is made up of a special mirror, two photodiodes and an electronic controller, and the electronic controller receives the front light and rear light signals sent by the photodiode, and is installed under the front windshield of the compartment.

Can be divided into manual anti-glare rearview mirror automatic anti-glare rearview mirror,

The principle of the automatic anti-dazzling rearview mirror is to compare the signals sent by the photodiodes on the front and the back, and then use the electronic controller to apply voltage to the ionosphere of the rearview mirror to darken its color, and the strong light emitted A large part will be absorbed by the mirror, so that the light reflected into the driver's eyes becomes softer, but this anti-glare has two disadvantages,

One is that when the light behind the car is weaker than the light in front of the car, if the rearview mirror is dimmed at this time, it is not conducive to the driver to reverse the car and see the situation behind the car clearly.

The second is because the voltage is applied to the ionosphere. The structure is to add electrochemical substances to the lens. When the lens is energized, the electrochemical substance undergoes chemical changes through the flowing current, thereby changing the light transmittance of the lens. The lens becomes dark. When the light is bright When the lens becomes brighter, the reaction speed of the whole process is slower. If the car suddenly encounters a strong light when driving at high speed, the driver cannot judge the sudden situation according to the strong light, which may cause a traffic accident.

Contents of the invention

Aiming at the shortcomings of the prior art, the present invention provides a car rearview mirror device that automatically adjusts the brightness. The device realizes that the rearview mirror can quickly and automatically adjust the brightness when the car encounters strong light or the ambient light becomes dark, so that the driver It can respond in time according to the situation, and it is equipped with a heater to eliminate the influence of frost on the rearview mirror.

The technical scheme that realizes the object of the present invention is:

An automobile rearview mirror device for automatically adjusting brightness, comprising a first photosensitive sensor, a second photosensitive sensor, an A/D conversion circuit, a D/A conversion circuit, a CPU control unit, an LCD liquid crystal screen, a voltage stabilizing circuit and an electric heater;

The second photosensitive sensor is connected with the first photosensitive sensor and the A/D conversion circuit,

The CPU control unit is respectively connected with the A/D conversion circuit and the D/A conversion circuit,

The LCD liquid crystal screen is connected with the D/A conversion circuit,

The voltage stabilizing circuit is connected with the CPU control unit and the electric heater;

The first photosensitive sensor is arranged on the back of the display screen area, and is used to judge whether it is day or night to control the opening and closing of the entire device;

The second photosensitive sensor is placed on the upper part of the rearview mirror, and is used to change the output voltage value of the photosensitive sensor according to the intensity of the ambient light.

The first photosensitive sensor and the second photosensitive sensor sense the change of external light, and convert the change of light into an electrical signal through the A/D conversion circuit, and transmit it to the CPU control unit.

The further CPU control unit makes the rearview mirror LCD display screen reach the corresponding brightness through digital-to-analog conversion according to the electrical signal.

The optical rotation of the LCD liquid crystal screen is adjusted by the applied voltage;

The LCD liquid crystal screen is a segmented black and white LCD liquid crystal screen, and the brightness can be adjusted step by step by changing the voltage value.

The electric heater is manually controlled, and is used to heat the rearview mirror, remove water droplets on the mirror surface in rainy or foggy days, and eliminate the influence of rain, snow or frost;

Beneficial effect

The invention provides an automobile rearview mirror device for automatically adjusting brightness. The device realizes that the rearview mirror can quickly and automatically adjust the brightness when the automobile encounters strong light or the ambient light becomes dark, so that the driver can make adjustments in time according to the situation. There is an electric heater to eliminate the impact of frost on the rearview mirror. The CPU changes the brightness of the LCD screen through voltage changes. The processing process is intelligent, the response is quick, and the brightness is consistent.

Description of drawings

Fig. 1 is a schematic diagram of the device structure of the present invention;

Fig. 2 is a schematic diagram of the control flow of the present invention.

detailed description

The content of the present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited thereto.

Example

A kind of car rearview mirror device that automatically adjusts brightness, comprises the first photosensitive sensor 1, the second photosensitive sensor 2, A/D conversion circuit 3, D/A conversion circuit 8, CPU control unit 4, LCD liquid crystal screen 7, stabilizing Piezoelectric circuit 5 and electric heater 6;

The second photosensitive sensor 2 is connected with the first photosensitive sensor 1 and the A/D conversion circuit 3,

The CPU control unit 4 is connected with the A/D conversion circuit 3 and the D/A conversion circuit 8 respectively,

The LCD liquid crystal screen 7 is connected with the D/A conversion circuit 8,

The voltage stabilizing circuit 5 is connected with the CPU control unit 4 and the electric heater 6;

The first photosensitive sensor 1 is arranged on the back of the LCD liquid crystal screen 7, and is used to judge whether it is day or night to control the opening and closing of the entire device;

The second photosensitive sensor 2 is placed on the upper part of the rearview mirror, and is used to change the output voltage value of the photosensitive sensor according to the intensity of the ambient light.

The first photosensitive sensor 1 and the second photosensitive sensor 2 sense the change of external light, and convert the light change into an electrical signal through the A/D conversion circuit 3 and transmit it to the CPU control unit 4 .

Further, the CPU control unit 4 converts the electrical signal through the D/A conversion circuit 8 to control the LCD liquid crystal screen 7 to achieve the corresponding brightness.

The optical rotation of the LCD liquid crystal screen 7 is adjusted by the applied voltage;

The LCD liquid crystal screen 7 is a segmented black and white LCD liquid crystal screen, and the brightness can be adjusted step by step by changing the voltage value.

The electric heating sheet 6 is manually controlled, and is used to heat the rearview mirror, remove water drops on the mirror surface in rainy or foggy days, and eliminate the influence of rain, snow or frost;

As shown in Figure 2, the general workflow

Before S101 driving, a driver judges whether there is frost and fog, and if yes, jump to S102 and execute in sequence

S102 Manually turn on the electric heater to heat, remove frost and fog

S103 The first photosensitive sensor judges whether it is night, if it is executed sequentially, if not, return to S108

S104 Turn on the second photosensitive sensor

S105 judges whether to accept strong light irradiation, if not, jump to S108, if yes, execute sequentially

S106CPU controller issues voltage command

S107LCD liquid crystal screen

S10 ends.

The control process of the above-mentioned automobile rearview mirror device with automatic brightness adjustment is as follows: after the automobile is started, if the first photosensitive sensor 1 turns on the whole device at night, the vehicle power supply supplies power to the CPU control unit 4 through the voltage stabilizing circuit 5. If there is frost in the sight glass, we manually turn on the electric heater 6 to heat it to eliminate the influence of frost; if the external light changes, the second photosensitive sensor 2 passes through to convert the light signal into an electrical signal, and then passes through the A/D conversion circuit 3 is converted into a digital signal and processed by the CPU control unit 4; then the CPU control unit 4 converts the digital signal into a corresponding voltage value signal through the D/A conversion circuit 8, and transmits it to the LCD liquid crystal screen 7 to achieve the purpose of adjusting the brightness of the screen Effect.

Claims (4)

1. a kind of automobile rear view mirror device of automatic regulating lightness, it is characterised in that including the first light sensor, second is photosensitive Sensor, A/D change-over circuits, D/A change-over circuits, CPU control units, LCD liquid crystal displays, mu balanced circuit and electric heating piece；

Second light sensor is connected with the first light sensor, A/D change-over circuits,

CPU control units are connected respectively with A/D change-over circuits, D/A change-over circuits,

LCD liquid crystal displays are connected with D/A change-over circuits,

Mu balanced circuit is connected with CPU control units, electric heating piece；

The first described light sensor is arranged at the back of display screen area, for judging daytime and night control whole device Opening with close；

The second described light sensor is positioned over rearview mirror top, change light sensor for the power of ambient light defeated The magnitude of voltage for going out,

First light sensor, the second light sensor, by the change of light, is led to by experiencing the change of ambient Cross A/D change-over circuits and change into electric signal, send CPU control units to,

According to electric signal, again Jing digital-to-analogue conversions make rearview mirror LCD display reach corresponding brightness to further CPU control units.

2. intensity adjustable display screen according to claim 1, it is characterised in that：Described LCD liquid crystal displays are segmentation Black and white LCD liquid crystal display, adjusts its optical activity and adjusts brightness step by step by added voltage swing.

3. according to claim 1 rearview mirror eliminates the impact of sleet sky or frost by installing electric heating piece.

4. a kind of automobile, it is characterised in that install on the automobile just like the automotive rear-view any one of claim 1-3 Lens device.