CN115578964A - Method and device for controlling brightness of display screen of electronic exterior rearview mirror - Google Patents

Abstract

The invention provides a method and a device for controlling the brightness of a display screen of an electronic exterior rearview mirror, wherein the method comprises the following steps: step 1, detecting whether a triggering condition for automatically adjusting the brightness of the display screen of the electronic exterior rearview mirror is met, if yes, entering the next step, otherwise, repeatedly executing the step; step 2, adjusting the current brightness of the display screen of the electronic exterior rear view mirror to the lowest brightness; step 3, determining a target display screen; step 4, obtaining the brightness of the current environment in the vehicle; step 5, adjusting the brightness of the target display screen to target brightness according to the current ambient light brightness in the vehicle; and 6, judging whether the sight line direction leaves the target display screen, if so, returning to the step 2, and otherwise, returning to the step 4. The invention realizes the automatic adjustment of the brightness of the display screen of the electronic exterior rearview mirror and improves the driving safety.

Description

Method and device for controlling brightness of display screen of electronic exterior rearview mirror

technical field

The invention relates to the field of display technology, in particular to a method and device for controlling the brightness of a display screen of an electronic exterior rearview mirror.

Background technique

With the continuous development of vehicle electronic technology, the trend of electronic exterior mirrors replacing traditional optical exterior mirrors has become more and more obvious. The electronic exterior rearview mirror can effectively eliminate visual blind spots by sending the left and right cameras installed outside the car to collect the road images behind the vehicle to the corresponding left and right display screens inside the car for display, and it is not affected by external factors such as weather and glare. smaller.

However, when the ambient light inside the car is low (such as at night), the picture of the display screen in the car of the electronic exterior mirror is a relatively large source of interference for the driver. Therefore, how to Intelligently adjusting the brightness of the interior display screen of the electronic exterior mirror has become an urgent problem to be solved.

Contents of the invention

The invention provides a method and device for controlling the brightness of the display screen of an electronic exterior rearview mirror, aiming at solving the defects in the prior art, realizing automatic adjustment of the brightness of the display screen of the electronic exterior rearview mirror, and improving driving safety.

In order to achieve the above object, the technical scheme adopted in the present invention is:

One aspect of the present invention provides a method for controlling the brightness of a display screen of an electronic exterior rearview mirror, comprising:

Step 1. Detect whether the trigger condition for automatic adjustment of the brightness of the electronic exterior mirror display is met, and if so, proceed to the next step; otherwise, repeat this step;

Step 2. Adjust the current brightness of the display screen of the electronic exterior rearview mirror to the lowest brightness;

Step 3. Determine the target display screen, the target display screen is the electronic exterior rearview mirror display screen whose brightness needs to be adjusted;

Step 4. Obtain the current ambient light brightness in the car;

Step 5, adjusting the brightness of the target display screen to the target brightness according to the current ambient light brightness in the vehicle;

Step 6. Judging whether the line of sight is away from the target display screen, if yes, return to step 2, otherwise return to step 4.

Specifically, the step 3 includes:

Step 301, determine the steering intention of the vehicle, and determine the display screen on the steering side as the target display screen, otherwise proceed to the next step;

Step 302, obtaining the driver's line of sight direction;

Step 303, determining the display screen that the driver's line of sight is facing as the target display screen.

Further, after the step 302, it also includes:

Step 302A, judging whether the driver's line of sight is facing the direction of the co-pilot, if yes, go to the next step, otherwise go to step 303;

Step 302B, determine whether the co-pilot has passengers, if yes, enter the next step, otherwise enter step 303;

Step 302C, detect whether there is a moving object behind the vehicle, if yes, go to step 303, otherwise return to step 302.

Specifically, the step 301 includes:

Step 3011, monitor whether the turn signal signal is valid, if yes, determine the steering intention of the vehicle according to the turn signal signal, otherwise go to the next step;

Step 3012, obtaining the slope of the left and right lane lines of the current lane;

Step 3013, calculating the first discriminant relation and the second discriminant relation;

Step 3014: Determine the steering intention of the vehicle according to the first discriminant relational expression and the second discriminant relational expression, including: if the first discriminant relational expression is greater than the first preset threshold, determine that the vehicle is turning right, If the second discriminant relational expression is greater than the first preset threshold, it is judged that the vehicle is turning left;

The first discriminant relational expression is p1=k2/(k2-k1), and the second discriminant relational expression is p2=k1/(k1-k2), wherein, k1 represents the slope of the left lane line of the current lane, and k2 represents The slope of the right lane line of the current lane.

Specifically, the step 302 includes:

Step 3021, obtain the driver's head image, and convert it into a grayscale image;

Step 3022, establish a coordinate system with the lower left corner of the grayscale image as the origin, the horizontal direction as the X axis, and the vertical direction as the Y axis;

Step 3023, perform face recognition, and obtain the driver's orbital parameters, which include: the x-coordinate of the right boundary of the left orbit, the x-coordinate of the left boundary of the right orbit, the width of the left orbit, and the width of the right orbit;

Step 3024, obtaining the center coordinates of the left and right pupils of the driver;

Step 3025. Calculate the third discriminant according to the driver's orbital parameters and the center coordinates of the driver's left and right pupils;

Step 3026: Determine the driver's line of sight direction according to the third discriminant formula, including: if the third discriminant formula is greater than the second preset threshold, then judging that the line of sight direction is left; if the third discriminant formula is smaller than the third preset threshold If the threshold is set, it is judged that the line of sight is to the right; if the third discriminant is between the second preset threshold and the third preset threshold, it is judged that the line of sight is in the middle;

The third discriminant is: p3=[x(ql)-x(lp)]/W(l)-[x(rp)-x(qr)]/W(r),

Among them, x(lp) represents the x-coordinate of the center of the left pupil, x(rp) represents the x-coordinate of the center of the right pupil; x(ql) represents the x-coordinate of the right boundary of the left orbit, and x(qr) represents the left The x-coordinate of the lateral border; W(l) indicates the width of the left orbit and W(r) the width of the right orbit.

Specifically, the step 5 includes:

Step 501, identifying the driver;

Step 502, obtaining the standard brightness value of the display screen of the driver at the best viewing distance under the current ambient light brightness in the vehicle;

Step 503, obtaining the actual distance between the driver and the target display screen;

Step 504, determine the target brightness according to the preset brightness adjustment relational expression;

The preset brightness adjustment relational formula is: L(Dj)=L0*Dp/D0, wherein, L(Dj) represents the target brightness, D0 represents the optimal viewing distance, L0 represents the standard brightness value of the display screen, and Dp represents the actual distance .

Another aspect of the present invention provides a brightness control device for an electronic exterior rearview mirror display screen, comprising:

The brightness control module, and the ambient light sensing module connected with the brightness control module, the trigger condition judgment module, the target display screen determination module, and the display module also include the camera module connected with the display module, and the trigger condition judgment module The vehicle speed detection module connected to the module, the trigger condition judgment module is also connected with the ambient light sensing module and the target display screen determination module;

The camera module is used to acquire road condition images;

The display module is used to display the road condition image obtained by the camera module;

The ambient light sensing module is used to obtain the current brightness value of the ambient light in the car;

The vehicle speed detection module is used to obtain the current vehicle speed;

The trigger condition judging module is used to judge whether the trigger condition for starting the automatic adjustment of the brightness of the display screen of the electronic exterior rearview mirror is met according to the current ambient light brightness value in the vehicle obtained by the ambient light sensing module and the current vehicle speed obtained by the vehicle speed detection module;

The target display screen determination module is used to determine the target display screen that needs brightness adjustment after the trigger condition is met;

The brightness control module is used to control the brightness of the target display screen according to the current ambient light brightness value in the vehicle obtained by the ambient light sensing module.

Specifically, the target display screen determination module includes: a steering intention judging submodule for determining the steering direction, and a gaze tracking submodule for identifying the direction of human gaze.

Further, the target display screen determination module further includes: a passenger monitoring submodule for determining whether the co-pilot has passengers, and a target identification submodule for monitoring whether there is a moving target behind the vehicle.

Specifically, the steering intention judgment submodule includes:

A turn signal acquisition unit, a lane line extraction unit, a first calculation unit, and a first judgment unit connected in sequence;

The turning signal acquisition unit is used to acquire the turning signal;

The lane line extraction unit is used to obtain the slope of the lane line;

The first calculation unit is used to calculate the first discriminant relational expression and the second discriminant relational expression;

The first judging unit is configured to judge the steering intention of the vehicle according to the first discriminant relational expression and the second discriminant relational expression.

Specifically, the gaze tracking submodule includes:

The orbital parameter acquisition unit, the pupil position acquisition unit, the second calculation unit, and the second judgment unit are sequentially connected;

The orbital parameter acquisition unit is used to acquire the driver's orbital parameters;

The pupil position acquisition unit is used for the center coordinates of the left and right pupils of the driver;

The second calculation unit is used to calculate the third discriminant according to the driver's orbital parameters and the center coordinates of the driver's left and right pupils;

The second judging unit is configured to determine the driver's line of sight direction according to the third judging formula.

Specifically, the brightness control module includes:

A brightness calculation submodule, and a driver identification submodule connected to the brightness calculation submodule, a storage submodule, and a distance acquisition submodule;

The driver identification sub-module is used to identify the identity of the driver;

The storage sub-module is used to store the standard brightness value of the display screen;

The distance obtaining submodule is used to obtain the actual distance between the driver and the target display screen;

The brightness calculation sub-module is used to determine the target brightness according to the standard brightness value of the display screen, the actual distance and the preset brightness adjustment relationship.

The beneficial effects of the present invention are: the present invention firstly adjusts the current brightness of the display screen of the electronic exterior rearview mirror to the minimum brightness after detecting that the trigger condition for automatic adjustment of the brightness of the display screen of the electronic exterior rearview mirror is satisfied, and then determines the target display screen , adjust the brightness of the target display screen to the target brightness according to the current ambient light brightness in the car, realize the automatic adjustment of the brightness of the electronic exterior rearview mirror display screen, and improve driving safety.

Description of drawings

Fig. 1 is the schematic flow sheet of electronic outside rearview mirror display brightness control method of the present invention;

Fig. 2 is a structural schematic diagram of the electronic exterior rearview mirror display brightness control device of the present invention.

detailed description

The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. The accompanying drawings are only for reference and description, and do not constitute a limitation to the protection scope of the present invention.

Example 1

As shown in Figure 1, the present embodiment provides a method for controlling the brightness of the display screen of an electronic exterior rearview mirror, including:

Step 1. Detect whether the trigger condition for automatic adjustment of the brightness of the display screen of the electronic exterior rearview mirror is met, and if yes, proceed to the next step; otherwise, repeat this step.

In this embodiment, the triggering conditions include: the ambient light brightness L(E) inside the vehicle is lower than a preset value, and the current vehicle speed V is greater than 0.

Step 2. Adjust the current brightness of the display screen of the electronic exterior rearview mirror to the minimum brightness.

In this embodiment, when the interior ambient light brightness L(E) is lower than the preset value, as the initial condition of the system, the current brightness of the display screens of the left and right electronic exterior mirrors is adjusted to the system The lowest allowable brightness L(D), instead of directly turning off the power of the display, can respond to subsequent brightness adjustments more quickly, timely display the rear road conditions, and improve system safety.

In order to prevent the driver from being disturbed by the sudden extinguishing of the display screen, a voice reminder can be used before reducing the brightness of the display screen.

Step 3. Determine the target display screen, where the target display screen is the electronic exterior rearview mirror display screen whose brightness needs to be adjusted.

Step 4. Obtain the current ambient light brightness L(E) inside the vehicle.

Step 5. Adjust the brightness of the target display screen to the target brightness L(Dj) according to the current ambient light brightness L(E) in the vehicle.

Step 6. Judging whether the line of sight is away from the target display screen, if yes, return to step 2, otherwise return to step 4.

Example 2

Different from Example 1, this description provides a specific implementation method of Step 3:

Step 301 , determine the steering intention of the vehicle, and determine the display screen on the steering side as the target display screen, otherwise proceed to the next step.

Step 302, acquiring the driver's line of sight direction.

Step 303, determining the display screen that the driver's line of sight is facing as the target display screen.

Example 3

Different from Embodiment 2, after the step 302, it also includes:

Step 302A, judging whether the driver's line of sight is facing the direction of the co-pilot, if yes, go to the next step, otherwise go to step 303.

Depending on the setting direction of the driving seat in different countries, the method of judging whether the driver's line of sight is facing the direction of the co-pilot is also different.

Step 302B, judging whether the co-pilot has passengers, if yes, go to the next step, otherwise go to step 303.

Step 302C, detect whether there is a moving object behind the vehicle, if yes, go to step 303, otherwise return to step 302.

Detecting whether there is a moving target behind the vehicle can be realized by means of image recognition, etc., which is a prior art and will not be repeated here.

Example 4

Different from Embodiment 2, this embodiment provides a specific implementation method of step 301:

Step 3011, monitor whether the turn signal signal is valid, if yes, determine the steering intention of the vehicle according to the turn signal signal, otherwise go to the next step;

Step 3012, acquire the slopes k1 and k2 of the left and right lane lines of the current lane.

Obtaining the slopes of the left and right lane lines is an existing technology, and will not be repeated here.

Step 3013, calculating the first discriminant relational expression and the second discriminant relational expression.

In this embodiment, the first discriminant relationship is p1=k2/(k2-k1), and the second discriminant relationship is p2=k1/(k1-k2), where k1 represents the left lane of the current lane The slope of the line, k2 represents the slope of the right lane line of the current lane.

Step 3014: Determine the steering intention of the vehicle according to the first discriminant relational expression and the second discriminant relational expression, including: if the first discriminant relational expression is greater than the first preset threshold p11, judge that the vehicle is turning right, If the second discriminant relational expression is greater than the first preset threshold p11, it is determined that the vehicle is turning left.

Wherein, the preset threshold p11 can be obtained through calibration of a set normal lane departure value.

Example 5

Different from Embodiment 2, this embodiment provides a specific implementation method of step 302:

Step 3021, acquire the driver's head image, and convert it into a grayscale image.

Step 3022: Establish a coordinate system with the lower left corner of the grayscale image as the origin, the horizontal direction as the X axis, and the vertical direction as the Y axis.

Step 3023, perform face recognition, and obtain the driver's orbital parameters, the driver's orbital parameters include: the x-coordinate of the right boundary of the left orbit, the x-coordinate of the left boundary of the right orbit, the width W(l) of the left orbit, the right Orbital width W(r).

Step 3024, acquire the center coordinates of the left and right pupils of the driver.

In the prior art, there are many methods to determine the pupil center position, such as the gradient-based algorithm proposed by Fabian Timm.

Step 3025: Calculate a third discriminant formula according to the driver's orbital parameters and the center coordinates of the driver's left and right pupils.

In this embodiment, the third discriminant formula is:

p3=[x(ql)-x(lp)]/W(l)-[x(rp)-x(qr)]/W(r),

Among them, x(lp) represents the x-coordinate of the center of the left pupil, x(rp) represents the x-coordinate of the center of the right pupil; x(ql) represents the x-coordinate of the right boundary of the left orbit, and x(qr) represents the left The x-coordinate of the lateral border; W(l) indicates the width of the left orbit and W(r) the width of the right orbit.

Step 3026: Determine the driver's gaze direction according to the third discriminant formula, including: if the third discriminant formula is greater than the second preset threshold p12, judge the gaze direction to be left; if the third discriminant formula is smaller than the third If the preset threshold p13 is used, it is judged that the direction of sight is rightward; if the third discriminant is between the second preset threshold p12 and the third preset threshold p13, it is judged that the direction of sight is in the middle.

In this embodiment, the second preset threshold p12=0.03, and the third preset threshold p13=-0.03.

Example 6

Different from Embodiment 1, this embodiment provides a specific implementation method of step 5:

Step 501, identify the driver.

Step 502. Obtain the standard brightness value L0 of the display screen of the driver at the optimal viewing distance D0 under the current ambient light brightness L(E) in the vehicle.

The standard luminance value L0 of the display screen indicates that the driver can obtain the most comfortable visual experience at the optimal viewing distance D0, which can be calibrated through experiments and stored.

Step 503, acquiring the actual distance Dp between the driver and the target display screen.

The actual distance Dp can be obtained by measuring in advance or setting a distance sensor on the display screen of the electronic exterior rearview mirror, and feeding back the measured result to the control system.

Step 504: Determine the target brightness L(Dj) according to the preset brightness adjustment relational expression.

In this embodiment, the preset brightness adjustment relational formula is: L(Dj)=L0*Dp/D0, wherein L(Dj) represents the target brightness, D0 represents the optimal viewing distance, and L0 represents the standard brightness of the display screen value, Dp represents the actual distance.

Example 7

As shown in Figure 2, the present embodiment provides a brightness control device for the display screen of an electronic exterior rearview mirror, including:

The brightness control module, and the ambient light sensing module connected with the brightness control module, the trigger condition judgment module, the target display screen determination module, and the display module also include the camera module connected with the display module, and the trigger condition judgment module The vehicle speed detection module connected to the module, the trigger condition judgment module is also connected with the ambient light sensing module and the target display screen determination module;

The camera module is used to acquire road condition images;

The display module is used to display the road condition image obtained by the camera module;

The ambient light sensing module is used to obtain the current brightness value of the ambient light in the car;

The vehicle speed detection module is used to obtain the current vehicle speed;

The trigger condition judging module is used to judge whether the trigger condition for starting the automatic adjustment of the brightness of the display screen of the electronic exterior rearview mirror is met according to the current ambient light brightness value in the vehicle obtained by the ambient light sensing module and the current vehicle speed obtained by the vehicle speed detection module;

The target display screen determination module is used to determine the target display screen that needs brightness adjustment after the trigger condition is met;

The brightness control module is used to control the brightness of the target display screen according to the current ambient light brightness value in the vehicle obtained by the ambient light sensing module.

Example 8

Different from Embodiment 7, this embodiment provides a specific structure of the target display screen determination module, including: a steering intention judgment sub-module for determining the steering direction, and a gaze tracking for identifying the direction of the human line of sight. submodule.

In another embodiment of the present invention, the target display screen determination module further includes: a passenger monitoring sub-module for determining whether the co-pilot has passengers, and a target identification sub-module for monitoring whether there is a moving target behind the vehicle.

Example 9

The difference from Embodiment 8 is that this embodiment provides a specific structure of the steering intention judgment submodule, including a turn signal acquisition unit, a lane line extraction unit, a first calculation unit, and a first judgment unit connected in sequence;

The turning signal acquisition unit is used to acquire the turning signal;

The lane line extraction unit is used to obtain the slope of the lane line;

The first calculation unit is used to calculate the first discriminant relational expression and the second discriminant relational expression;

The first judging unit is configured to judge the steering intention of the vehicle according to the first discriminant relational expression and the second discriminant relational expression.

Example 10

Different from Embodiment 8, this embodiment provides a specific structure of the gaze tracking submodule, including an orbital parameter acquisition unit, a pupil position acquisition unit, a second calculation unit, and a second judgment unit connected in sequence;

The orbital parameter acquisition unit is used to acquire the driver's orbital parameters;

The pupil position acquisition unit is used for the center coordinates of the left and right pupils of the driver;

The second calculation unit is used to calculate the third discriminant according to the driver's orbital parameters and the center coordinates of the driver's left and right pupils;

The second judging unit is configured to determine the driver's line of sight direction according to the third judging formula.

Example 11

Different from Embodiment 7, this embodiment provides a specific structure of the brightness control module, including: a brightness calculation sub-module, and a driver identification sub-module connected to the brightness calculation sub-module, a storage sub-module, Distance acquisition sub-module;

The driver identification sub-module is used to identify the identity of the driver;

The storage sub-module is used to store the standard brightness value of the display screen;

The distance obtaining submodule is used to obtain the actual distance between the driver and the target display screen;

The brightness calculation sub-module is used to determine the target brightness according to the standard brightness value of the display screen, the actual distance and the preset brightness adjustment relationship.

The above disclosures are only preferred embodiments of the present invention, and cannot be used to limit the protection scope of the present invention. Therefore, equivalent changes made according to the patent scope of the present invention still fall within the scope of the present invention.

Claims (12)

1. A method for controlling the brightness of a display screen of an electronic exterior rearview mirror is characterized by comprising the following steps:

step 1, detecting whether a trigger condition for automatically adjusting the brightness of the display screen of the electronic exterior rear-view mirror is met, if yes, entering the next step, and otherwise, repeatedly executing the step;

step 2, adjusting the current brightness of the display screen of the electronic exterior rear view mirror to the lowest brightness;

step 3, determining a target display screen, wherein the target display screen is an electronic exterior mirror display screen of which the brightness needs to be adjusted;

step 4, obtaining the brightness of the current environment in the vehicle;

step 5, adjusting the brightness of the target display screen to a target brightness according to the current ambient light brightness in the vehicle;

and 6, judging whether the sight line direction leaves the target display screen, if so, returning to the step 2, otherwise, returning to the step 4.

2. The method for controlling the brightness of the display screen of the electronic exterior mirror according to claim 1, wherein the step 3 comprises:

step 301, determining the steering intention of the vehicle, determining a display screen on the steering side as a target display screen, and otherwise, entering the next step;

step 302, obtaining the sight line direction of a driver;

step 303, determining the display screen towards which the driver looks as a target display screen.

3. The method for controlling the brightness of the display screen of the electronic exterior mirror according to claim 2, further comprising, after the step 302:

step 302A, judging whether the sight line direction of the driver faces to a copilot direction, if so, entering the next step, otherwise, entering step 303;

step 302B, judging whether the passenger exists in the copilot, if so, entering the next step, otherwise, entering step 303;

and step 302C, detecting whether a moving target exists behind the vehicle, if so, entering step 303, and otherwise, returning to step 302.

4. The method for controlling the brightness of the display screen of the electronic exterior mirror according to claim 2, wherein the step 301 comprises:

step 3011, monitoring whether the turn signal is valid, if yes, determining the turning intention of the vehicle according to the turn signal, otherwise, entering the next step;

step 3012, obtaining slopes of left and right lane lines of a current lane;

step 3013, calculating a first discrimination relation and a second discrimination relation;

step 3014, determining the steering intention of the vehicle according to the first and second discriminant relations, including: if the first judgment relation is larger than a first preset threshold value, judging that the vehicle turns to the right, and if the second judgment relation is larger than the first preset threshold value, judging that the vehicle turns to the left;

the first discriminant relation is p1= k 2/(k 2-k 1), and the second discriminant relation is p2= k 1/(k 1-k 2), where k1 represents a slope of a left lane line of the current lane and k2 represents a slope of a right lane line of the current lane.

5. The method as claimed in claim 2, wherein the step 302 comprises:

step 3021, acquiring a head image of the driver, and converting the head image into a gray image;

step 3022, establishing a coordinate system with the lower left corner of the grayscale image as the origin, the horizontal direction as the X-axis, and the vertical direction as the Y-axis;

step 3023, performing face recognition to obtain eye socket parameters of the driver, where the eye socket parameters of the driver include: the x coordinate of the right side boundary of the left eye socket, the x coordinate of the left side boundary of the right eye socket, the width of the left eye socket and the width of the right eye socket;

step 3024, obtaining the central coordinate positions of the left pupil and the right pupil of the driver;

step 3025, calculating a third discriminant according to the orbital parameters of the driver and the central coordinate positions of the left pupil and the right pupil of the driver;

step 3026, determining the driver's gaze direction according to the third criterion includes: if the third discriminant is larger than a second preset threshold, judging that the sight line direction is leftward; if the third discriminant is smaller than a third preset threshold, judging that the sight line direction is rightward; if the third discriminant is between a second preset threshold and a third preset threshold, judging that the sight line direction is middle;

the third discriminant is: p3= [ x (ql) -x (lp) ]/W (l) - [ x (rp) -x (qr) ]/W (r),

wherein x (lp) represents the x coordinate of the left pupil center position, and x (rp) represents the x coordinate of the right pupil center position; x (ql) represents the x coordinate of the right border of the left orbit, x (qr) represents the x coordinate of the left border of the right orbit; w (l) represents the width of the left orbit and W (r) represents the width of the right orbit.

6. The electronic exterior mirror display screen brightness control method according to claim 1, wherein the step 5 comprises:

step 501, identifying a driver;

502, obtaining a standard brightness value of a display screen when the driver has the best viewing distance under the current in-vehicle environment brightness;

step 503, acquiring the actual distance between the driver and the target display screen;

step 504, determining the target brightness according to a preset brightness adjustment relational expression;

the preset brightness regulation relational expression is as follows: l (Dj) = L0 × Dp/D0, where L (Dj) represents target luminance, D0 represents optimal viewing distance, L0 represents display screen standard luminance value, and Dp represents actual distance.

7. An electronic exterior mirror display screen brightness control device, comprising:

the system comprises a brightness control module, an ambient light sensing module, a trigger condition judging module, a target display screen determining module and a display module which are connected with the brightness control module, a camera module connected with the display module, and a vehicle speed detecting module connected with the trigger condition judging module, wherein the trigger condition judging module is also connected with the ambient light sensing module and the target display screen determining module;

the camera module is used for acquiring road condition images;

the display module is used for displaying the road condition image acquired by the camera module;

the environment light sensing module is used for acquiring the current environment light brightness value in the vehicle;

the vehicle speed detection module is used for acquiring the current vehicle speed;

the trigger condition judging module is used for judging whether a trigger condition for starting the automatic brightness adjustment of the display screen of the electronic exterior rearview mirror is met or not according to the current in-vehicle environment light brightness value acquired by the environment light sensing module and the current vehicle speed acquired by the vehicle speed detecting module;

the target display screen determining module is used for determining a target display screen needing brightness adjustment after the trigger condition is met;

and the brightness control module is used for controlling the brightness of the target display screen according to the current in-vehicle ambient light brightness value acquired by the ambient light sensing module.

8. The electronic exterior mirror display screen brightness control device according to claim 7, wherein the target display screen determination module includes: a steering intention judging submodule for determining the steering direction and a sight tracking submodule for identifying the direction of the sight of human eyes.

9. The electronic exterior mirror display screen brightness control device according to claim 8, wherein the target display screen determination module further comprises: the passenger monitoring submodule is used for determining whether passengers exist in the copilot or not, and the target recognition submodule is used for monitoring whether a moving target exists behind the vehicle or not.

10. The electronic exterior mirror display screen brightness control device according to claim 8, wherein the turning intention judging sub-module includes:

the system comprises a turn light signal acquisition unit, a lane line extraction unit, a first calculation unit and a first judgment unit which are sequentially connected;

the turn signal acquiring unit is used for acquiring a turn signal;

the lane line extraction unit is used for acquiring the slope of a lane line;

the first calculating unit is used for calculating a first judging relational expression and a second judging relational expression;

and the first judging unit is used for judging the steering intention of the vehicle according to the first judging relational expression and the second judging relational expression.

11. The electronic exterior mirror display screen brightness control of claim 8, wherein the gaze tracking sub-module comprises:

the eye socket parameter acquisition unit, the pupil position acquisition unit, the second calculation unit and the second judgment unit are sequentially connected;

the orbit parameter acquisition unit is used for acquiring orbit parameters of a driver;

the pupil position acquisition unit is used for acquiring the central coordinate positions of left and right pupils of a driver;

the second calculation unit is used for calculating a third discriminant according to the orbital parameters of the driver and the coordinate positions of the centers of the left and right pupils of the driver;

and the second judgment unit is used for determining the sight line direction of the driver according to a third judgment formula.

12. The electronic exterior mirror display screen brightness control device according to claim 7, wherein the brightness control module comprises:

the brightness calculation sub-module, and the driver identification sub-module, the storage sub-module and the distance acquisition sub-module which are connected with the brightness calculation sub-module;

the driver identification submodule is used for identifying the identity of a driver;

the storage submodule is used for storing the standard brightness value of the display screen;

the distance acquisition submodule is used for acquiring the actual distance between the driver and the target display screen;

and the brightness calculation submodule is used for determining the brightness of the target according to the standard brightness value of the display screen, the actual distance and a preset brightness regulation relational expression.

Images