Windshield control method and system

Abstract

The present application relates to the technical field of display, and provides a windshield control method and system. The method comprises: by means of a sensor, acquiring vehicle exterior environment information and driver behavior information in real time; and on the basis of the vehicle exterior environment information and the driver behavior information, respectively driving liquid crystal molecules in two liquid crystal thin films in a designated area on the inner side of a windshield to deflect in a designated direction until a designated included angle is formed between the liquid crystal modules in the two liquid crystal thin films. In the present application, the included angle between liquid crystal molecules in two liquid crystal thin films in a designated area on the inner side of a windshield is controlled, thereby implementing the control of the light transmittance of the windshield on the basis of specific scene characteristics, protecting eyes of a driver, providing a clear field of view, and ensuring driving safety; in addition, in the present application, pixel-level control can be achieved for a liquid crystal control area, so that each liquid crystal pixel can be accurately controlled, and positions on which the light transmittance needs to be changed are accurately controlled, without the need of synchronously changing the entire windshield, thereby achieving high fineness of control.

Description

Windshield control method and control system TECHNICAL FIELD

[0001] The application belongs to the technical field of display, and particularly relates to a windshield control method and a control system. BACKGROUND

[0002] During vehicle driving, special external light conditions can affect the driver's vision, and can greatly increase the risk of driving accidents. For example, in a strong sunlight scene, the driver's eyes are easily stimulated by sunlight, which can cause fatigue and discomfort; the high beam of an oncoming vehicle at night can cause the driver to be unable to open his eyes; and the glare of external light in rainy weather can also disturb the driver's vision.

[0003] In the prior art, there are design schemes for adjusting the brightness of the whole windshield in the face of different external light conditions. However, this scheme has the defects of affecting the driver's observation of the external environment and insufficient control precision. SUMMARY

[0004] In view of the above technical problems, the application provides a windshield control method and a control system.

[0005] Specifically, the application provides a windshield control method, which comprises: acquiring vehicle external environment information and driver behavior information in real time through a sensor; and driving liquid crystal molecules in two layers of liquid crystal films in a specified area on the inner side of the windshield to deflect in a specified direction according to the vehicle external environment information and the driver behavior information, until the liquid crystal molecules in the two layers of liquid crystal films form an included angle of a specified angle.

[0006] This technical means realizes control of the light transmittance of the windshield according to specific scene characteristics by controlling the included angle of the liquid crystal molecules in the two layers of liquid crystal films in the specified area on the inner side of the windshield, protects the driver's eyes, provides a clear field of view for the driver, and ensures driving safety; and the liquid crystal control area proposed in the application realizes accurate control to each liquid crystal pixel, and accurate control of the position where the light transmittance needs to be changed without synchronous change of the whole windshield.

[0007] Further, the vehicle external environment information at least comprises an external light state; and the driver behavior information at least comprises a driver eye position and driver head movement information.

[0008] By acquiring the light state and the driver's eye and head information, a reliable and comprehensive information source basis is provided for subsequent light scene analysis, and the accuracy of subsequent control of the liquid crystal molecules is ensured.

[0009] Further, the control of the liquid crystal molecules in the two-layer liquid crystal film to form a specified angle includes: combining the vehicle external environment information and the driver behavior information to obtain a current light scene; matching the light scene with a plurality of preset light scene types to obtain a light scene type to which the current light scene belongs.

[0010] Further, the control of the liquid crystal molecules in the two-layer liquid crystal film to form a specified angle also includes: outputting a corresponding control signal according to the light scene type to which the current light scene belongs, and generating an electrical signal based on the control signal to drive the liquid crystal molecules in the two-layer liquid crystal film to deflect, thereby controlling the positional relationship of the liquid crystal molecules; wherein the control signal at least includes a first control signal, a second control signal and a third control signal.

[0011] By matching to find the light scene type of the current light scene, and then controlling the positional relationship of the liquid crystal molecules to adapt to this light scene type, the light transmission mode of the windshield can be quickly changed according to the environmental information and the driver state, providing a clear view for the driver and ensuring driving safety.

[0012] Further, the preset light scene type at least includes a first light scene type, a second light scene type and a third light scene type; and the control of the positional relationship of the liquid crystal molecules in the two-layer liquid crystal film includes: when the current light scene belongs to the first light scene type, outputting a first control signal to control the liquid crystal molecules in the two-layer liquid crystal film to be parallel to each other based on the first control signal; when the current light scene belongs to the second light scene type, determining a to-be-controlled area in the two-layer liquid crystal film and outputting a second control signal to control the liquid crystal molecules in the to-be-controlled area to form a specified non-zero angle based on the second control signal; and when the current light scene belongs to the third light scene type, outputting a third control signal to control the liquid crystal molecules in the two-layer liquid crystal film to be parallel to each other and form a specified non-zero angle with the horizontal road surface based on the third control signal.

[0013] According to different light scene types, the liquid crystal molecules form different angles, which realizes flexible change of the light transmission of the windshield according to the environmental light level and the driver state information; at the same time, flexible adjustment of the light transmission of a specific area on the windshield, i.e., the position corresponding to the driver's line of sight, is realized, with high control precision.

[0014] Further, the first light scene type at least includes a scene in which the overall brightness of the environment is lower than a preset value; the second light scene type at least includes a scene in which light from an external light source of the vehicle irradiates into the vehicle; and the third light scene type at least includes a scene in which a specified degree of glare phenomenon occurs in the driver's field of view.

[0015] The preset light scene types for several special light scene scenarios are designed, and the several types are representative and often appear in actual road driving process.

[0016] Further, the determination of the to-be-controlled area in the two-layer liquid crystal film comprises: obtaining the distance between the to-be-controlled point on the windshield and the sensor based on the light source, the driver's eye position and the sensor, so as to determine the to-be-controlled area according to the distance between the to-be-controlled point and the sensor.

[0017] Further, the obtaining of the distance between the to-be-controlled point and the sensor comprises: determining a positioning triangle with the positions of the light source, the driver's eye position and the sensor as vertices; obtaining an inner angle of the positioning triangle with the driver's eye position as a vertex according to the distance between the driver's eye position and the light source, the distance between the light source and the sensor, and the inner angle of the positioning triangle with the sensor as a vertex; and obtaining the distance between the to-be-controlled point on the windshield and the sensor according to the inner angle of the positioning triangle with the driver's eye position as a vertex and the distance between the driver's eye position and the sensor.

[0018] Further, the determination of the to-be-controlled area according to the distance between the to-be-controlled point and the sensor comprises: determining the position of the to-be-controlled point according to the distance between the to-be-controlled point and the sensor; and determining the to-be-controlled area according to the position of the to-be-controlled point; the to-be-controlled area comprises a specified range of area around the to-be-controlled point on the windshield.

[0019] The light source in front of the vehicle, such as the high beam of the oncoming lane and the ambient light, can be obtained by the sensor, the light intensity information of a very fine area in front of the driver can be obtained, and the direction of the light can be accurately calculated by the algorithm, so that the deflection angle of each liquid crystal pixel can be precisely controlled, and the smooth transition of the entire windshield transmittance can be achieved.

[0020] Based on the same inventive concept, the application further provides a windshield control system according to the windshield control method, the system at least comprising a sensor, a controller and a liquid crystal driver; the sensor is used to obtain real-time vehicle external environment information and driver behavior information; the controller is used to output a control signal to the liquid crystal driver according to the vehicle external environment information and the driver behavior information; and the liquid crystal driver is used to drive the liquid crystal molecules in the two-layer liquid crystal film in the specified area on the inner side of the windshield to deflect in a specified direction according to the control signal, until the liquid crystal molecules in the two-layer liquid crystal film form a specified angle.

[0021] The above control system can finely control the deflection of liquid crystal molecules of the liquid crystal film, dynamically adjust the positional relationship of the liquid crystal molecules, protect the eyes of the driver, provide a clearer windshield view, and ensure driving safety.

[0022] Further, the controller comprises at least a memory and a processor; the memory is used to store computer instructions of a plurality of function layers; the function layers comprise at least a calculation function layer, a matching function layer and an output function layer; the processor communicates with the memory through a bus, and is used to execute computer instructions of each function layer stored in the memory.

[0023] Further, the calculation function layer comprises at least a calculation function module; the calculation function module comprises computer instructions used to combine the off-vehicle environment information and the driver behavior information for analysis to obtain a current light scene; wherein the calculation function layer provides the current light scene to the matching function layer.

[0024] Further, the matching function layer comprises at least a matching function module; the matching function module comprises computer instructions used to match the light scene with a plurality of preset light scene types to obtain a light scene type to which the current light scene belongs, and obtain a corresponding calling signal according to the light scene type; wherein the light scene type comprises at least a first light scene type, a second light scene type and a third light scene type, and the matching function layer provides the calling signal to the output function layer.

[0025] Further, the output function layer comprises at least a first output function module, a second output function module and a third output function module; the first output function module comprises computer instructions used to receive the calling signal corresponding to the first light scene type, and output a first control signal; the second output function module comprises computer instructions used to receive the calling signal corresponding to the second light scene type, determine a to-be-controlled area in the two-layer liquid crystal film, and output a second control signal; and the third output function module comprises computer instructions used to receive the calling signal corresponding to the third light scene type, and output a third control signal.

[0026] The above modularization of each function layer of the memory makes the control system adaptable to different scene requirements.

[0027] Further, the liquid crystal driver comprises at least an input port, a generation module and an output port; the input port is configured to receive the control signal output by the output function layer; the control signal comprises at least the first control signal, the second control signal and the third control signal; the generation module is configured to generate an electric signal based on the control signal; and the output port is configured to output the electric signal to the liquid crystal film, so as to drive the liquid crystal molecules in the two-layer liquid crystal film to deflect, and further control the positional relationship of the liquid crystal molecules.

[0028] The liquid crystal driver can generate an electric signal with sufficient strength, which can drive the liquid crystal molecules to deflect 1, and the deflected liquid crystal molecules have the function of reducing the transmittance or filtering polarized light.

[0029] In summary, the application belongs to the technical field of display, and proposes a windshield control method and a control system. The sensor is used to acquire the vehicle external environment information and the driver behavior information in real time. According to the vehicle external environment information and the driver behavior information, the liquid crystal molecules in the two-layer liquid crystal film in the specified area on the inner side of the windshield are driven to deflect in a specified direction, until the liquid crystal molecules in the two-layer liquid crystal film form a specified angle. The application controls the included angle of the liquid crystal molecules in the two-layer liquid crystal film in the specified area on the inner side of the windshield, controls the light transmittance of the windshield according to the specific scene characteristics, protects the eyes of the driver, provides a clear field of view, and ensures the driving safety. Moreover, the liquid crystal control area of the application can achieve pixel-level control, accurately controls each liquid crystal pixel, accurately controls the position where the light transmittance needs to be changed, and does not need to change the whole windshield synchronously, so the control precision is high.

[0030] Compared with the prior art, the application has at least the following beneficial effects:

[0031] The application controls the included angle of the liquid crystal molecules in the two-layer liquid crystal film in the specified area on the inner side of the windshield, controls the light transmittance of the windshield according to the specific scene characteristics, protects the eyes of the driver, provides a clear field of view, and ensures the driving safety. Moreover, the liquid crystal control area of the application can achieve pixel-level control, accurately controls each liquid crystal pixel, accurately controls the position where the light transmittance needs to be changed, and does not need to change the whole windshield synchronously; meanwhile, the light transmittance can be steplessly adjusted, so that the low light transmittance and the high light transmittance time can be smoothly transitioned, the visual discomfort of the driver is reduced, the control area can be changed along with the movement of the head or the eyes of the driver, and the eyes of the driver are better protected. BRIEF DESCRIPTION OF DRAWINGS

[0032] FIG. 1 is a flow diagram of a windshield control method according to an embodiment of the application.

[0033] FIG. 2 is a schematic diagram of a windshield structure according to an embodiment of the application.

[0034] Figure 3 is a schematic diagram of a method for determining a region to be controlled according to an embodiment of the application.

[0035] Figure 4 is a schematic diagram of a windshield control system according to an embodiment of the application.

[0036] Figure 5 is a schematic diagram of a controller framework according to an embodiment of the application.

[0037] Figure 6 is a schematic diagram of a memory framework according to an embodiment of the application.

[0038] Figure 7 is a schematic diagram of a liquid crystal driver framework according to an embodiment of the application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0040] Embodiment One:

[0041] Referring to Figure 1, which is a schematic diagram of a method for controlling a windshield according to an embodiment of the application.

[0042] Specifically, the present application proposes a method for controlling a windshield, the method comprising: acquiring vehicle exterior environment information and driver behavior information in real time through a sensor; driving liquid crystal molecules in two layers of liquid crystal films in a specified region on the inner side of the windshield to deflect in a specified direction according to the vehicle exterior environment information and the driver behavior information, until the liquid crystal molecules in the two layers of liquid crystal films form an included angle of a specified angle.

[0043] The vehicle exterior environment information includes the state of light outside the vehicle, such as the ambient brightness and whether there is direct sunlight, etc.; the driver behavior information includes the position of the driver's eyes and the movement information of the driver's head, etc.

[0044] In a preferred embodiment of the present application, Figure 2 is a schematic diagram of a windshield structure according to an embodiment of the application.

[0045] In this embodiment, the specific steps for controlling the windshield are as follows:

[0046] 1) Receive the image of the front camera outside the vehicle, analyze the current ambient brightness, whether there is high beam shining, track the changes and displacements of abnormal bright spots; receive the image of the camera inside the vehicle, analyze the activity state of the driver's head and eyes, the position of the driver's eyes, etc.

[0047] 2) According to the results of the previous two analyses, if it is daytime, the ambient light is too strong to stimulate the driver's eyes, the output control signal will reduce the light transmittance of the entire liquid crystal film, reducing the brightness of the light entering the driver's eyes.

[0048] If the sun is directly above the driver's eyes, the output control signal will reduce the light transmittance of the corresponding position in the liquid crystal film according to the position of the driver's eyes captured by the in-vehicle camera, protecting the driver's eyes, while the light transmittance of other areas is not affected. If the driver's head or eyes move, the position of the control area will also adjust accordingly, and the light transmittance will also be adjusted appropriately according to the brightness.

[0049] If it is night, the external brightness is low, the control of the two layers of liquid crystal molecules is deflected to the parallel state, making the entire film in a full transmittance state.

[0050] If it is night, the high beam or scattered light in front of the car shines into the driver's cabin, the two layers of liquid crystal molecules in the area where the incident light from the driver's front is deflected to have a certain angle between them. The angle is 0 when the light transmittance is highest, and the angle is perpendicular when the light transmittance is lowest. The controller calculates the light intensity of the high beam and the angle of incidence on the windshield to calculate the angle of the two layers of liquid crystal molecules. The stronger the light intensity, the larger the angle, and the lower the light transmittance, reducing the stimulation of the driver's eyes. While other areas maintain high light transmittance, not affecting the driver's observation.

[0051] If it is raining, the external light produces a lot of scattered glare, making it difficult for the driver to observe the external road conditions. At this time, the controller outputs a polarization control signal, making the two layers of liquid crystal molecules in the film have an angle of 0, with the highest light transmittance, but forming a certain angle with the horizontal direction of the road surface to eliminate most of the glare reflected from the road surface, allowing the driver to clearly observe the road conditions.

[0052] 3) The liquid crystal driver installed in the vehicle receives the control signal from the controller and generates a corresponding electric signal with sufficient strength. This electric signal can drive the liquid crystal molecules in the liquid crystal film to deflect, and the deflected liquid crystal molecules have the effect of reducing the transmittance or filtering polarized light.

[0053] 4) The liquid crystal film is attached to the inside of the front windshield, and the film has two layers, each containing liquid crystal molecules that can be independently controlled. Adjusting the relative rotation angle of the two layers of liquid crystal molecules controls the light transmittance, with the smallest light transmittance when the two layers are perpendicular and the largest light transmittance when they are parallel. At this time, it has a polarization effect that can filter glare, but in order to achieve the maximum elimination of ground glare, the rotation direction of the two layers of liquid crystal film also needs to have a certain angle with the ground driving direction.

[0054] 5) The liquid crystal control area in this embodiment can achieve pixel-level control, accurate control to each liquid crystal pixel, accurate control of the position where the light transmittance needs to be changed, stepless adjustment of the light transmittance, smooth transition of low light transmittance and high light transmittance time, no discomfort for the driver, and movement of the control area with the driver's head or eye position to better protect the driver's eyes.

[0055] 6) In this embodiment, the camera and the controller can use the existing camera and controller hardware of the intelligent driving control system, without further improvement of the structure.

[0056] This technical means controls the included angle of the liquid crystal molecules in the two-layer liquid crystal film in the specified area on the inner side of the windshield, controls the light transmittance of the windshield according to the specific scene characteristics, protects the driver's eyes, provides a clear view for the driver, and ensures driving safety. Moreover, the liquid crystal control area proposed in the application achieves accurate control to each liquid crystal pixel, accurate control of the position where the light transmittance needs to be changed, and no need to change the entire windshield synchronously.

[0057] Further, controlling the liquid crystal molecules in the two-layer liquid crystal film to form a specified angle includes: analyzing the current light scene by combining the vehicle external environment information and the driver behavior information; matching the light scene with a plurality of preset light scene types to obtain a light scene type to which the current light scene belongs; outputting a corresponding control signal according to the light scene type to which the current light scene belongs, and generating an electric signal based on the control signal to drive the liquid crystal molecules in the two-layer liquid crystal film to deflect, and further control the positional relationship of the liquid crystal molecules. The control signal at least includes a first control signal, a second control signal and a third control signal.

[0058] By matching to find the light scene type of the current light scene, and then controlling the positional relationship of the liquid crystal molecules to adapt to the light scene type, the light transmittance mode of the windshield can be quickly changed according to the environmental information and the driver's state, a clear view is provided for the driver, and driving safety is ensured.

[0059] Further, the preset light scene type includes a first light scene type, a second light scene type and a third light scene type; and the control of the positional relationship of the liquid crystal molecules in the two-layer liquid crystal film according to the light scene type to which the current light scene belongs includes:

[0060] When the current light scene belongs to the first light scene type, a first control signal is outputted to control the liquid crystal molecules in the two-layer liquid crystal film to be parallel to each other; when the current light scene belongs to the second light scene type, a to-be-controlled region in the two-layer liquid crystal film is determined, and a second control signal is outputted to control the liquid crystal molecules in the to-be-controlled region to form a specified non-zero angle; when the current light scene belongs to the third light scene type, a third control signal is outputted to control the liquid crystal molecules in the two-layer liquid crystal film to be parallel to each other and form a specified non-zero angle with the horizontal road surface.

[0061] According to different light scene types, the liquid crystal molecules form different angles, the light transmittance of the windshield is flexibly changed according to the ambient light level and the driver state information, the light transmittance of a specific region on the windshield, i.e., the position corresponding to the driver's line of sight, is flexibly adjusted, and the control precision is high.

[0062] Further, the first light scene type includes a scene in which the overall brightness of the environment is lower than a preset value; the second light scene type includes a scene in which light from an external light source irradiates into the vehicle; and the third light scene type includes a scene in which a specified degree of glare phenomenon occurs in the driver's field of view.

[0063] In the second light scene type, the light can be light greater than a specified intensity or light from a light source within a specified threshold distance from the vehicle.

[0064] Several preset light scene types for special light scenes are designed, and these types are representative and often occur in actual road driving.

[0065] Further, the determination of the to-be-controlled region in the two-layer liquid crystal film includes: obtaining the distance between a to-be-controlled point on the windshield and the sensor based on the light source, the driver's eye position, and the sensor, to determine the to-be-controlled region according to the distance between the to-be-controlled point and the sensor.

[0066] The distance between the to-be-controlled point and the sensor is obtained by: determining a positioning triangle with the positions of the light source, the driver's eye position, and the sensor as vertices; obtaining an internal angle of the positioning triangle with the driver's eye position as a vertex according to the distances between the driver's eye position and the light source and between the light source and the sensor, and the internal angle of the positioning triangle with the sensor as a vertex; and obtaining the distance between the to-be-controlled point on the windshield and the sensor according to the internal angle of the positioning triangle with the driver's eye position as a vertex and the distance between the driver's eye position and the sensor.

[0067] The determining the to-be-controlled region according to the distance between the to-be-controlled point and the sensor comprises: determining the position of the to-be-controlled point according to the distance between the to-be-controlled point and the sensor; and determining the to-be-controlled region according to the position of the to-be-controlled point; the to-be-controlled region comprises a region of a specified range around the to-be-controlled point on the windshield.

[0068] Referring to FIG. 3, it is a schematic diagram of a to-be-controlled region determination method according to an embodiment of the present application

[0069] As shown in FIG. 3, the A point is provided with a front camera towards the outside of the vehicle and an in-vehicle camera towards the inside of the vehicle; the B point is the position of the driver's eyes; the C point is the position of the high beam; the O point is the liquid crystal light transmittance control point; a is the distance between the high beam and the driver; b is the distance between the high beam and the camera towards the outside of the vehicle; c is the distance between the in-vehicle camera and the driver; and α is the angle between the lens normal line calculated by the front camera and the light line of the high beam; and β is the angle between the lens normal line calculated by the in-vehicle camera and the line connecting the driver's eyes.

[0070] The object photographed by the camera forms an image on the CCD image plane of the camera, which contains the shape, size and position information of the object, and the pixel points of the image can be corresponded to the points on the actual object surface, thereby establishing the corresponding relationship between the pixel points and the points on the actual object surface.

[0071] Through the above-mentioned corresponding relationship, the coordinates of the pixel points in the image can be determined, and the angle between the incident light line corresponding to the pixel points and the optical axis of the camera can be calculated by using the triangular geometry principle in combination with the camera internal and external parameters.

[0072] Through the angle calculation and the triangular measurement principle, the distance between the measured object and the camera can be calculated. Specifically, the distance between the measured object surface point and the optical center of the camera can be calculated by using the triangular measurement principle by using the known pixel point coordinates, the coordinates of the actual object surface point and the calculated angle.

[0073] The distances b and c and the angles α and β can be calculated through the above-mentioned principle.

[0074] According to the formula of the side length and the angle of the triangle, we have: (Formula 1);

[0075] (Formula 2);

[0076] (Formula 3);

[0077] From Formula 3, we have: (Formula 4);

[0078] From Formula 2, we have: (Formula 5);

[0079] The angle B is calculated using Equation 4, and then angle B is substituted into Equation 5 to calculate... length, Given the distance from the camera position to the liquid crystal transmittance control point, and the relative position of the camera installation position on the windshield, the position of point O on the windshield can be determined by converting the relative position. Then, by controlling the deflection of liquid crystal molecules within a certain range of O, the position of the transmittance point can be precisely controlled.

[0080] Sensors can acquire information about the light sources in front of the vehicle, such as the high beams of oncoming headlights and ambient light. They can obtain light intensity information for a very detailed area in front of the driver's field of vision. Algorithms can accurately calculate the direction of the light, thereby finely controlling the deflection angle of each liquid crystal pixel to achieve a smooth transition in the light transmittance of the entire windshield.

[0081] Example 2:

[0082] Based on the same inventive concept, please refer to Figure 4. This application also proposes a windshield control system according to the windshield control method, the system including at least a sensor 10, a controller 20 and a liquid crystal driver 30.

[0083] The sensor 10 is used to acquire real-time information about the external environment and driver behavior. Specifically, the sensor 10 includes at least an external front camera and an internal camera. The external front camera is installed above the windshield and is responsible for acquiring images of the front of the vehicle and transmitting them to the controller 20. The internal camera is installed in the driver's cab, facing the driver's head, and is responsible for capturing the position of the driver's eyes. Both the external front camera and the internal camera are connected to the controller 20.

[0084] The controller 20 is used to output control signals to the liquid crystal driver 30 based on the external environment information and driver behavior information. The controller 20 is installed inside the vehicle and connected to the liquid crystal driver 30. Referring to Figure 5, the controller 20 includes at least a memory 201 and a processor 202. The memory 201 stores computer instructions for multiple functional layers. Referring to Figure 6, the functional layers include at least a calculation functional layer 204, a matching functional layer 205, and an output functional layer 206. The processor 202 communicates with the memory 201 via a bus 203 and executes the computer instructions for each functional layer stored in the memory 201.

[0085] In some embodiments, the processor 202 may be a Central Processing Unit (CPU), or it may be other general-purpose processors 202, digital signal processors 202 (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor 202 may be a microprocessor 202, or it may be any conventional processor 202. In some embodiments, the memory 201 may be an internal storage unit of the computer device, such as a hard disk or RAM. In other embodiments, the memory 201 may be an external storage device of the computer device, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. Further, the memory 201 may include both internal and external storage units of the computer device. The memory 201 is used to store the operating system, applications, bootloader, data, and other programs, such as the program code of the computer program. The memory 201 can also be used to temporarily store data that has been output or will be output.

[0086] The calculation function layer 204 includes at least a calculation function module 2041; the calculation function module 2041 includes computer instructions for analyzing the external environment information and the driver behavior information to obtain the current lighting scene; wherein the calculation function layer 204 provides the current lighting scene to the matching function layer 205.

[0087] In some embodiments, the computer instructions of the computing function module 2041 correspond to an image recognition algorithm, which analyzes the image information collected by the front camera outside the vehicle and the camera inside the vehicle to identify the current lighting scene.

[0088] The matching function layer 205 includes at least a matching function module 2051; the matching function module 2051 includes a computer instruction for matching the light scene with a plurality of preset light scene types to obtain the light scene type to which the current light scene belongs, and obtaining a corresponding call signal according to the light scene type; wherein, the light scene type includes at least a first light scene type, a second light scene type and a third light scene type, and the matching function layer 205 provides a call signal to the output function layer 206.

[0089] In some embodiments, the computer instructions of the matching function module 2051 correspond to corresponding matching algorithms, such as rule-based matching algorithms, which set clear judgment conditions for each preset lighting scene type. When the current lighting scene meets all the conditions of a certain preset type, it is judged as that type. Alternatively, classification algorithms in machine learning, such as decision trees, support vector machines, and neural networks, are used. First, a large amount of labeled data (including vehicle exterior environment information and driver behavior information of known lighting scene types) is used to train the model. The trained model can perform classification prediction based on the input current lighting scene information. The matching function module 2051 calls different output function modules according to the identified lighting scene type.

[0090] The output function layer 206 includes at least a first output function module 2061, a second output function module 2062, and a third output function module 2063. The first output function module 2061 includes a computer instruction for receiving a call signal corresponding to a first lighting scene type and outputting a first control signal. The second output function module 2062 includes a computer instruction for receiving a call signal corresponding to a second lighting scene type to determine the area to be controlled in the two liquid crystal films 40 and outputting a second control signal. The third output function module 2063 includes a computer instruction for receiving a call signal corresponding to a third lighting scene type and outputting a third control signal.

[0091] In some embodiments, different functions correspond to each output function module. For example, when the current scene type is the first light scene, the matching function module 2051 calls the first output function module 2061. At this time, the first output function module 2061 runs to output the first control signal. The other output function modules are similar and will not be described in detail here.

[0092] It should be noted that the first lighting scene type includes scenes where the overall ambient brightness is lower than a preset value, the second lighting scene type includes scenes where light shines into the vehicle from a light source outside the vehicle, and the third lighting scene type includes scenes that cause a specified degree of glare in the driver's field of vision.

[0093] It should also be noted that the algorithm logic for the second output function module 2062 to determine the computer instructions with control areas is as follows:

[0094] A positioning triangle is determined using the positions of the light source, the driver's eye position, and the sensor 10 as vertices. Then, based on the distance between the driver's eye position and the light source, the distance between the light source and the sensor 10, and the interior angles of the positioning triangle with the sensor 10 as the vertex, the interior angles of the positioning triangle with the driver's eye position as the vertex are obtained. Further, based on the interior angles of the positioning triangle with the driver's eye position as the vertex and the distance between the driver's eye position and the sensor 10, the distance between the point to be controlled on the windshield and the sensor 10 is obtained. Finally, the position of the point to be controlled is determined based on the distance between the point to be controlled and the sensor 10, and the controllable area is determined based on the position of the point to be controlled. The controllable area includes a specified range around the point to be controlled on the windshield.

[0095] The liquid crystal driver 30 is used to drive the liquid crystal molecules in the two layers of liquid crystal films 40 in a specified area inside the windshield to deflect in a specified direction according to the control signal, until the liquid crystal molecules in the two layers of liquid crystal films 40 form an angle of a specified angle.

[0096] Referring to Figure 7, the liquid crystal driver 30 includes at least an input port 301, a generation module 302, and an output port 303. The input port 301 is used to receive control signals output by the output functional layer 206. The control signals include at least a first control signal, a second control signal, and a third control signal. The generation module 302 is used to generate electrical signals based on the control signals. The output port 303 is used to output the electrical signals to the liquid crystal film 40 to drive the liquid crystal molecules in the two layers of liquid crystal film 40 to deflect, thereby controlling the positional relationship of the liquid crystal molecules.

[0097] The liquid crystal driver 30 is connected to the liquid crystal film 40 of the windshield. After obtaining the light scene type, the controller 20 maps different light scene types to corresponding control signals and outputs the control signals to the liquid crystal driver 30. At this time, its input port 301 receives the control signals, and the generation module 302 generates electrical signals according to the signal conversion mechanism. This electrical signal is output through the output port 303 so that the electrical signal is applied to the two layers of liquid crystal film 40. Specifically, the liquid crystal driver 30 can be a dedicated integrated circuit chip. Its input port 301 receives the control signals from the controller 20, and its output port 303 is connected to the electrodes of the liquid crystal film 40.

[0098] In the first light scene type, the generated electrical signal controls the liquid crystal molecules in the two layers of liquid crystal film 40 to be parallel to each other; in the second light scene type, the generated electrical signal controls the liquid crystal molecules in the area to be controlled to form a specified non-zero angle; in the third light scene type, the generated electrical signal controls the liquid crystal molecules in the two layers of liquid crystal film 40 to be parallel to each other and to form a specified non-zero angle with the horizontal road surface.

[0099] In summary, this application belongs to the field of display technology and proposes a windshield control method and control system. It acquires real-time information about the external environment and driver behavior through sensors. Based on this information, it drives the liquid crystal molecules in two layers of liquid crystal films in a designated area on the inner side of the windshield to deflect in a designated direction until the liquid crystal molecules in the two layers of liquid crystal films form a designated angle. By controlling the angle between the liquid crystal molecules in the two layers of liquid crystal films in a designated area on the inner side of the windshield, this application achieves control over the windshield's light transmittance according to specific scene characteristics, protecting the driver's eyes, providing a clear field of vision, and ensuring driving safety. Moreover, the liquid crystal control area of ​​this application can achieve pixel-level control, precisely controlling each liquid crystal pixel and precisely controlling the location where the light transmittance needs to be changed, without requiring the entire windshield to change synchronously, resulting in high control precision.

[0100] In the several embodiments provided in this application, it will be understood that each block in the flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the figures. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved.

[0101] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause an electronic device to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0102] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit the scope of protection of this application. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application for those skilled in the art.

Claims

1. A windshield control method, wherein, The method comprises: Real-time acquisition of vehicle external environment information and driver behavior information through a sensor; According to the vehicle external environment information and the driver behavior information, the liquid crystal molecules in the two layers of liquid crystal films in the specified area on the inner side of the windshield are driven to deflect in a specified direction until the liquid crystal molecules in the two layers of liquid crystal films form an included angle of a specified angle.

2. The windshield control method of claim 1, wherein, The vehicle external environment information at least includes the light state outside the vehicle; and the driver behavior information at least includes the driver's eye position and the driver's head movement information.

3. The windshield control method of claim 2, wherein, Controlling the liquid crystal molecules in the two layers of liquid crystal films to form an included angle of a specified angle comprises: Combining the vehicle external environment information and the driver behavior information for analysis to obtain a current light scene; Matching the light scene with a plurality of preset light scene types to obtain a light scene type to which the current light scene belongs.

4. The windshield control method of claim 3, wherein, Controlling the liquid crystal molecules in the two layers of liquid crystal films to form an included angle of a specified angle further comprises: According to the light scene type to which the current light scene belongs, outputting a corresponding control signal, and generating an electrical signal based on the control signal to drive the liquid crystal molecules in the two layers of liquid crystal films to deflect, thereby controlling the positional relationship of the liquid crystal molecules; The control signal at least includes a first control signal, a second control signal and a third control signal.

5. The windshield control method of claim 4, wherein, The preset light scene type at least includes a first light scene type, a second light scene type and a third light scene type; The control of the positional relationship of the liquid crystal molecules in the two layers of liquid crystal films comprises: When the current light scene belongs to the first light scene type, outputting the first control signal to control the liquid crystal molecules in the two layers of liquid crystal films to be parallel to each other based on the first control signal; When the current light scene belongs to the second light scene type, determining a to-be-controlled area in the two layers of liquid crystal films, and outputting the second control signal to control the liquid crystal molecules in the to-be-controlled area to form an included angle of a specified non-zero angle based on the second control signal; When the current light scene belongs to the third light scene type, outputting the third control signal to control the liquid crystal molecules in the two layers of liquid crystal films to be parallel to each other and form an included angle of a specified non-zero angle with the horizontal road surface based on the third control signal.

6. A windscreen control method according to claim 5, wherein, The first light scene type at least includes a scene in which the overall brightness of the environment is lower than a preset value; The second light scene type at least includes a scene in which light from an external light source of the vehicle irradiates the driver inside the vehicle; The third light scene type at least includes a scene in which a specified degree of glare phenomenon is generated in the driver's field of view.

7. The windshield control method of claim 5, wherein, The determination of the to-be-controlled area in the two layers of liquid crystal films comprises: Based on the positions of the light source, the driver's eye position and the sensor, a positioning triangle is determined with the positions of the light source, the driver's eye position and the sensor as the vertices; and the distance between the to-be-controlled point on the windshield and the sensor is obtained to determine the to-be-controlled area according to the distance between the to-be-controlled point and the sensor.

8. A windscreen control method according to claim 7, wherein, The distance between the to-be-controlled point and the sensor is obtained by: Determining a positioning triangle with the positions of the light source, the driver's eye position and the sensor as the vertices; and According to the distance between the driver's eye position and the light source, the distance between the light source and the sensor, and the inner angle of the positioning triangle with the sensor as the vertex, the inner angle of the positioning triangle with the driver's eye position as the vertex is obtained; According to the inner angle of the positioning triangle with the driver's eye position as the vertex and the distance between the driver's eye position and the sensor, the distance between the to-be-controlled point on the windshield and the sensor is obtained.

9. The windshield control method of claim 8, wherein, The determination of the to-be-controlled region according to the distance between the to-be-controlled point and the sensor comprises: According to the distance between the to-be-controlled point and the sensor, the position of the to-be-controlled point is determined; According to the position of the to-be-controlled point, the to-be-controlled region is determined; the to-be-controlled region comprises a specified range of regions around the to-be-controlled point on the windshield.

10. A windscreen control system, wherein, The system at least comprises a sensor (10), a controller (20) and a liquid crystal driver (30); The sensor (10) is used to acquire real-time vehicle external environment information and driver behavior information; The controller (20) is used to output a control signal to the liquid crystal driver (30) according to the vehicle external environment information and the driver behavior information; The liquid crystal driver (30) is used to drive the liquid crystal molecules in the two layers of liquid crystal films (40) in the specified region on the inner side of the windshield to deflect in the specified direction according to the control signal, until the liquid crystal molecules in the two layers of liquid crystal films (40) form a specified angle.

11. The windshield control system of claim 10, wherein, The controller (20) at least comprises a memory (201) and a processor (202); The memory (201) is used to store computer instructions of multiple function layers; the function layers at least comprise a calculation function layer (204), a matching function layer (205) and an output function layer (206); The processor (202) communicates with the memory (201) through a bus (203) and is used to execute the computer instructions of each function layer stored in the memory (201).

12. The windshield control system of claim 11, wherein, The calculation function layer (204) at least comprises a calculation function module (2041); the calculation function module (2041) comprises computer instructions used to analyze the vehicle external environment information and the driver behavior information to obtain a current light scene; wherein the calculation function layer (204) provides the current light scene to the matching function layer (205).

13. The windshield control system of claim 12, wherein, The matching function layer (205) at least comprises a matching function module (2051); the matching function module (2051) comprises computer instructions used to match the light scene with a plurality of preset light scene types to obtain a light scene type to which the current light scene belongs, and acquire a corresponding calling signal according to the light scene type; wherein the light scene type at least comprises a first light scene type, a second light scene type and a third light scene type, and the matching function layer (205) provides the calling signal to the output function layer (206).

14. The windshield control system of claim 13, wherein, The output function layer (206) at least comprises a first output function module (2061), a second output function module (2062) and a third output function module (2063). The first output function module (2061) comprises computer instructions for receiving a calling signal corresponding to a first light scene type, and outputting a first control signal; The second output function module (2062) comprises computer instructions for receiving a calling signal corresponding to a second light scene type, determining a to-be-controlled area in the two-layer liquid crystal film (40), and outputting a second control signal; The third output function module (2063) comprises computer instructions for receiving a calling signal corresponding to a third light scene type, and outputting a third control signal.

15. The windscreen control system of claim 14, wherein, The liquid crystal driver (30) comprises at least an input port (301), a generation module (302), and an output port (303); The input port (301) is configured to receive a control signal output by the output function layer (206), wherein the control signal comprises at least the first control signal, the second control signal, and the third control signal; The generation module (302) is configured to generate an electrical signal based on the control signal; The output port (303) is configured to output the electrical signal to the liquid crystal film (40), so as to drive liquid crystal molecules in the two-layer liquid crystal film (40) to deflect, and further control a positional relationship of the liquid crystal molecules.

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