Vehicle-mounted projection curtain control method and device and vehicle

Abstract

The invention relates to the technical field of projection, in particular to a vehicle-mounted projection curtain control method and device and a vehicle. The method is applied to the vehicle-mounted projection device, and the vehicle-mounted projection device is configured in the mode that a rolling driving mechanism of the vehicle-mounted projection device can roll or unroll a vehicle-mounted projection curtain and drive a curtain supporting mechanism to rotate in the front-back direction so as to drive the vehicle-mounted projection curtain to rotate in the front-back direction. The actual sight direction of at least one film watching passenger is obtained; calculating a sight line deviation angle between the at least one actual sight line direction and the corresponding direct sight line direction, calculating an angle adjustment value according to the at least one sight line deviation angle, and generating a control signal according to the angle adjustment value; the rolling driving mechanism responds to the control signal and drives the curtain supporting mechanism to rotate the angle adjustment value so that the vehicle-mounted projection curtain can rotate the angle adjustment value, and the normal vector of the rotated vehicle-mounted projection curtain can be matched with the actual sight line direction. By adopting the method, the film watching experience of the user can be improved.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and in particular to a method, device and vehicle for controlling a vehicle-mounted projection screen. Background Art

[0002] With the rapid development of the automobile industry and the growing demand of consumers for vehicle entertainment functions, in-vehicle projection technology is constantly developing and improving. In-vehicle projection technology refers to the technology of using projection equipment in the car to project information or entertainment content onto specific surfaces in the car (such as windshield, car projection screen or other internal components).

[0003] Regarding the method of realizing projection through a vehicle-mounted projection screen, the vehicle-mounted projection screen of the related technology adopts a fixed installation type. The user needs to watch at a specific position and at a specific angle to achieve the best viewing effect. If the user changes the position, the viewing effect will be reduced.

[0004] Therefore, the relevant technology has low flexibility in controlling the screen, resulting in the user's viewing experience needing to be improved. Summary of the invention

[0005] Based on this, it is necessary to provide a vehicle-mounted projection screen control method, device and vehicle to address the above-mentioned technical problems, so as to improve the flexibility of vehicle-mounted projection screen control and thus improve the user's viewing experience.

[0006] In a first aspect, a method for controlling a vehicle-mounted projection screen is provided, wherein the method is applied to a vehicle-mounted projection device, wherein the vehicle-mounted projection device comprises:

[0007] Car projection screen;

[0008] A screen support mechanism, used to provide support when the vehicle-mounted projection screen is in an unfolded state;

[0009] A winding drive mechanism, used for winding or unfolding the vehicle-mounted projection screen, and controlling the screen support mechanism to rotate forward and backward, so that the vehicle-mounted projection screen rotates forward and backward to change the inclination angle of the vehicle-mounted projection screen relative to a horizontal plane or a vertical plane;

[0010] The method comprises:

[0011] When the vehicle-mounted projection screen is unfolded, obtaining the actual sight direction of at least one viewing passenger;

[0012] Calculating a sight line deviation angle between at least one of the actual sight line directions and a simulated direct sight line direction, calculating an angle adjustment value according to at least one of the sight line deviation angles, and generating a control signal according to the angle adjustment value;

[0013] The winding drive mechanism drives the screen support mechanism to rotate the angle adjustment value in response to the control signal, so that the vehicle-mounted projection screen rotates by the angle adjustment value, and the normal vector of the rotated vehicle-mounted projection screen matches the actual line of sight direction.

[0014] In combination with the first aspect, in a first possible implementation manner of the first aspect, calculating the angle adjustment value according to at least one of the sight line deviation angles includes:

[0015] When the number of the movie-watching passenger is one, calculating the difference between the sight line deviation angle and a preset angle critical value to obtain the angle adjustment value;

[0016] When the number of the movie-watching passengers is more than one, a weighted calculation is performed on the difference between each sight line deviation angle and a preset angle critical value to obtain the angle adjustment value.

[0017] In combination with the first possible implementation of the first aspect, in a second possible implementation of the first aspect, when the number of the movie-watching passengers is more than one, weighted calculation is performed on the difference between each of the sight line deviation angles and a preset angle threshold value to obtain the angle adjustment value, including:

[0018] Obtaining the inclination angle difference between the seat backs corresponding to the movie-watching passengers;

[0019] When each of the inclination angle differences is less than or equal to a preset inclination angle threshold, weighted calculation is performed on the difference between each of the sight line deviation angles and a preset angle critical value to obtain the angle adjustment value;

[0020] When there is an inclination difference greater than the inclination threshold value among all the inclination differences, the preset main viewing angle direction and angle critical value are obtained, and the difference between the line of sight deviation angle from the main viewing angle direction and the angle critical value is calculated to obtain the angle adjustment value.

[0021] In combination with the first aspect, in a third possible implementation manner of the first aspect, the rolling drive mechanism is configured to be able to move forward and backward along the roof; before or after the rolling drive mechanism drives the curtain support mechanism to rotate the angle adjustment value, the method further includes:

[0022] Obtaining the contour of the front seats and the contour of the vehicle-mounted projection screen after rotation;

[0023] In the case where there is an overlapping portion between the contour of the front seat and the contour of the vehicle-mounted projection screen after rotation, a longitudinal distance adjustment value required after the vehicle-mounted projection screen is rotated is calculated, and the winding drive mechanism moves backward by the longitudinal distance adjustment value.

[0024] In combination with the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, calculating the longitudinal distance adjustment value required after the vehicle-mounted projection screen is rotated includes:

[0025] Calculating the longitudinal movement distance of the end of the vehicle-mounted projection screen after the vehicle-mounted projection screen rotates by the angle adjustment value;

[0026] Obtaining the distance between the end of the vehicle-mounted projection screen and the front seat before the vehicle-mounted projection screen rotates by the angle adjustment value;

[0027] In the case where the longitudinal moving distance is greater than the spacing distance, a longitudinal distance adjustment value required to eliminate the overlapping portion is calculated to obtain a longitudinal distance adjustment value required after the vehicle-mounted projection screen is rotated.

[0028] In combination with the first aspect, in a fifth possible implementation of the first aspect, calculating a sight deviation angle between at least one of the actual sight directions and the simulated direct sight direction includes:

[0029] For each of the actual sight lines, obtaining the actual sight line landing point where the actual sight line falls on the vehicle-mounted projection screen and the reference sight line landing point where the direct sight line falls on the vehicle-mounted projection screen;

[0030] Acquire the longitudinal deviation distance between the actual sight line landing point and the reference sight line landing point and the actual sight line distance between the actual sight line landing point and the eyes of the viewing passenger;

[0031] The sight line deviation angle between the actual sight line direction and the direct sight line direction is calculated according to the longitudinal deviation distance and the actual sight line distance.

[0032] In combination with the first aspect, in a sixth possible implementation of the first aspect, calculating a sight deviation angle between at least one of the actual sight directions and the simulated direct sight direction includes:

[0033] For each actual sight line direction, obtaining the actual sight line distance from the viewing passenger to the vehicle-mounted projection screen along the actual sight line direction and the reference sight line distance from the viewing passenger to the vehicle-mounted projection screen along the direct sight line direction;

[0034] A sight line deviation angle between the actual sight line direction and the direct sight line direction is calculated according to the reference sight line distance and the actual sight line distance.

[0035] In a second aspect, a vehicle-mounted projection screen control device is provided, which is applied to a vehicle-mounted projection device, and the vehicle-mounted projection device includes:

[0036] Car projection screen;

[0037] A screen support mechanism, used to provide support when the vehicle-mounted projection screen is in an unfolded state;

[0038] A winding drive mechanism, used for winding or unfolding the vehicle-mounted projection screen, and controlling the screen support mechanism to rotate forward and backward, so that the vehicle-mounted projection screen rotates forward and backward to change the inclination angle of the vehicle-mounted projection screen relative to a horizontal plane or a vertical plane;

[0039] The vehicle-mounted projection screen control device comprises:

[0040] A detection module, used for obtaining the actual sight line direction of at least one viewing passenger when the vehicle-mounted projection screen is unfolded;

[0041] A control module, configured to calculate a sight line deviation angle between at least one of the actual sight line directions and a simulated direct sight line direction, calculate an angle adjustment value according to at least one of the sight line deviation angles, and generate a control signal according to the angle adjustment value;

[0042] The winding drive mechanism drives the screen support mechanism to rotate the angle adjustment value in response to the control signal, so that the vehicle-mounted projection screen rotates by the angle adjustment value, and the normal vector of the rotated vehicle-mounted projection screen matches the actual line of sight direction.

[0043] In combination with the second aspect, in a first possible implementation manner of the second aspect, the curtain supporting mechanism includes:

[0044] A cross bar, installed at the end of the vehicle-mounted projection screen, providing support when the vehicle-mounted projection screen is in an unfolded state, so that the vehicle-mounted projection screen remains in the unfolded state;

[0045] Two first telescopic rods are respectively located at the two side edges of the side of the vehicle-mounted projection screen facing away from the projection direction, and are installed between the winding drive mechanism and the cross bar, and are telescopic when the winding drive mechanism unfolds or winds up the vehicle-mounted projection screen;

[0046] Two folding rods, two ends of each folding rod are rotatably connected to two ends of the first telescopic rod respectively, and each folding rod is opened or folded when the winding drive mechanism unfolds or winds up the vehicle-mounted projection screen;

[0047] The second telescopic rod has two ends respectively fixed to the folding positions of the two folding rods, and is telescopic when the two folding rods are opened or folded.

[0048] In a third aspect, a vehicle is provided, comprising the vehicle-mounted projection device and the vehicle-mounted projection screen control device as described in the second aspect or the first implementable mode of the second aspect.

[0049] The above-mentioned vehicle-mounted projection screen control method, device and vehicle, the method is applied to the vehicle-mounted projection device, the vehicle-mounted projection device includes: a vehicle-mounted projection screen, a screen support mechanism and a winding drive mechanism, wherein the screen support mechanism is used to provide support when the vehicle-mounted projection screen is in an unfolded state, the winding drive mechanism is used to roll up or unfold the vehicle-mounted projection screen, and control the screen support mechanism to rotate forward and backward, so that the vehicle-mounted projection screen rotates forward and backward to change the inclination angle of the vehicle-mounted projection screen relative to the horizontal plane or the vertical plane; the method includes: when the vehicle-mounted projection screen is unfolded, obtaining the actual sight direction of at least one viewing passenger; calculating the sight deviation angle between at least one actual sight direction and the corresponding direct sight direction, calculating the angle adjustment value according to the at least one sight deviation angle, and generating a control signal according to the angle adjustment value; the winding drive mechanism drives the screen support mechanism to rotate the angle adjustment value in response to the control signal, so that the vehicle-mounted projection screen rotates the angle adjustment value, and the normal vector of the rotated vehicle-mounted projection screen matches the actual sight direction. It can be seen that the vehicle-mounted projection screen control method of the present application can change the inclination angle of the vehicle-mounted projection screen according to the line of sight of the viewing passengers to match the actual line of sight of the viewing passengers, without the need for the viewing passengers to maintain a specific position to watch the movie. Therefore, the present application improves the flexibility of the related technology for screen control, thereby improving the user's viewing experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A structural block diagram of a vehicle-mounted projection device to which a vehicle-mounted projection screen control method is applied in an embodiment;

[0051] Figure 2 A schematic diagram of a process flow of a vehicle-mounted projection screen control method in one embodiment;

[0052] Figure 3 is a schematic diagram of a relative coordinate system in one embodiment;

[0053] Figure 4 A position comparison diagram of a vehicle-mounted projection screen before and after rotation in one embodiment;

[0054] Figure 5 is a simulation diagram of an actual sight line direction and a direct sight line direction in one embodiment;

[0055] Figure 6 is a simulation diagram of an actual sight line direction and a direct sight line direction in one embodiment;

[0056] Figure 7 is a structural block diagram of a vehicle-mounted projection screen control device in one embodiment;

[0057] Figure 8 is a schematic structural diagram of a curtain support mechanism in one embodiment;

[0058] Fig. 9 is a schematic structural diagram of a curtain support mechanism in one embodiment;

[0059] Fig.10 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment.

[0060] Description of reference numerals:

[0061] 1. a vehicle-mounted projection device; 11. a vehicle-mounted projection screen; 12. a screen support mechanism; 121. a cross bar; 122. a first telescopic rod; 123. a folding rod; 1231. a first unit rod; 1232. a second unit rod; 124. a second telescopic rod; 13. a rolling drive mechanism. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0063] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present application in a schematic manner, and therefore the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0064] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical contents disclosed in this application.

[0065] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0066] At present, the vehicle-mounted projection screen of the related technology adopts a fixed installation type, and a winding drive mechanism is installed on the roof of the vehicle. The winding drive mechanism drives the vehicle-mounted projection screen to move in the vertical direction to roll up or unfold the vehicle-mounted projection screen. For this method, the user needs to watch the movie in a specific position and at a specific angle, for example, sitting upright on the seat or leaning slightly on the seat back, in order to achieve the best viewing effect; if the user changes the position, for example, the user leans on the seat back and increases the inclination angle of the seat back, at this time, the vehicle-mounted projection screen still remains in a vertically unfolded state, resulting in a reduced viewing effect.

[0067] In order to improve the flexibility of screen control and enhance the user's viewing experience, the present application proposes a vehicle-mounted projection screen control method, which is applied to a vehicle-mounted projection device, which includes a vehicle-mounted projection screen, a screen support mechanism and a winding drive mechanism, wherein the screen support mechanism provides support force when the vehicle-mounted projection screen is unfolded, the winding drive mechanism winds or unfolds the vehicle-mounted projection screen, and controls the screen support mechanism to rotate forward and backward, thereby driving the vehicle-mounted projection screen to rotate forward and backward to change the inclination angle of the vehicle-mounted projection screen relative to the horizontal plane or the vertical plane.

[0068] Based on the device, when the vehicle-mounted projection screen is unfolded, the actual sight directions of all viewing passengers are obtained; the sight deviation angles between all actual sight directions and the simulated direct sight directions are calculated, the angle adjustment values ​​are calculated according to all sight deviation angles, and the corresponding control signals are generated according to the angle adjustment values; the winding drive mechanism drives the screen support mechanism to rotate the angle adjustment value in response to the control signal, so as to drive the vehicle-mounted projection screen to rotate the angle adjustment value, so that the normal vector of the rotated vehicle-mounted projection screen matches the actual sight direction.

[0069] It can be seen that when the actual line of sight direction of the movie-watching passengers changes, the present application can adaptively change the inclination angle of the vehicle-mounted projection screen to match the actual line of sight direction of the movie-watching passengers. The movie-watching passengers do not need to maintain a specific position to watch the movie to ensure the viewing effect, thereby improving the flexibility of the screen control and the user's viewing experience.

[0070] Next, the present application will be described in detail through the following examples.

[0071] In one embodiment, a vehicle-mounted projection screen control method is provided, and the method is applied to Figure 1The vehicle-mounted projection device 1 in the embodiment is described as an example. The vehicle-mounted projection device 1 includes: a vehicle-mounted projection screen 11, a screen supporting mechanism 12 and a rolling drive mechanism 13, wherein the screen supporting mechanism 12 is used to provide support when the vehicle-mounted projection screen 11 is in an unfolded state; the rolling drive mechanism 13 is used to roll up or unfold the vehicle-mounted projection screen 11, and control the screen supporting mechanism 12 to rotate forward and backward, so that the vehicle-mounted projection screen 11 rotates forward and backward to change the inclination angle of the vehicle-mounted projection screen 11 relative to a horizontal plane or a vertical plane.

[0072] In a specific embodiment, the winding drive mechanism 13 is installed on the roof and is located behind the driver's seat and the co-driver's seat, and extends along the width direction of the vehicle. It is suitable for winding the vehicle-mounted projection screen 11 into the cavity of the roof or unfolding the vehicle-mounted projection screen 11 in the vertical direction.

[0073] Since the vehicle-mounted projection screen 11 is generally made of flexible materials, in order to ensure that the vehicle-mounted projection screen 11 can remain flat in the unfolded state, and to ensure that the projection screen can remain flat and not fall after rotating a certain angle, to improve the phenomenon that the flatness of the vehicle-mounted projection screen 11 is reduced due to special road conditions such as road bumps during vehicle driving, and to improve the viewing experience of the movie-watching passengers. Therefore, a screen support mechanism 12 is installed on the back side of the vehicle-mounted projection screen 11, that is, the side away from the projection direction, and the screen support mechanism 12 is configured to be able to retract and / or fold along the reeling or unfolding direction of the vehicle-mounted projection screen 11 under the driving force of the reeling drive mechanism 13.

[0074] Exemplarily, the screen support mechanism 12 is a telescopic rod that can be extended and retracted along the winding or unfolding direction of the vehicle-mounted projection screen 11, or the screen support mechanism 12 is a folding rod that can be folded or unfolded along the winding or unfolding direction of the vehicle-mounted projection screen 11, or the screen support mechanism 12 includes a telescopic rod that can be extended and retracted along the winding or unfolding direction of the vehicle-mounted projection screen 11 and a folding rod that can be folded or unfolded.

[0075] The winding drive mechanism 13 drives the vehicle-mounted projection screen 11 to unfold and drives the screen support mechanism 12 to extend or open. The screen support mechanism 12 provides support when the vehicle-mounted projection screen 11 is in the unfolded state, so that the vehicle-mounted projection screen 11 remains flat; and the winding drive mechanism 13 drives the vehicle-mounted projection screen 11 to roll up and drives the screen support mechanism 12 to shorten or fold. When the vehicle-mounted projection screen 11 is in the rolled-up state, the screen support mechanism 12 follows the vehicle-mounted projection screen 11 to be stored in the cavity on the roof.

[0076] Since the extension and / or folding of the screen support mechanism 12 is performed on the back of the vehicle-mounted projection screen 11, although the rolling or unfolding of the vehicle-mounted projection screen 11 and the extension and / or folding of the screen support mechanism 12 occur simultaneously, there will be no interference between them.

[0077] The winding drive mechanism 13 is also configured to be rotatably connected to the screen support mechanism 12 along its own length extension direction. With the front direction of the vehicle as the forward direction, the screen support mechanism 12 can rotate forward or backward under the driving force of the winding drive mechanism 13 and maintain the rotated state, thereby driving the vehicle-mounted projection screen 11 to rotate forward or backward and maintain the rotated state, so as to change the inclination angle of the vehicle-mounted projection screen 11 relative to the horizontal plane or the vertical plane.

[0078] As an example, the winding drive mechanism 13 is provided with a rotating rod along its length extension direction, and the rotating rod is rotatably connected to both ends of the winding drive mechanism 13. The winding drive mechanism 13 is also provided with a driving source for driving the rotating rod to rotate with its own central axis as the rotating axis; the rotating rod is fixedly connected to the screen support mechanism 12. When the driving source controls the rotating rod to rotate, the rotating rod drives the screen support mechanism 12 to rotate, thereby driving the vehicle-mounted projection screen 11 to rotate, so as to adjust the inclination angle of the vehicle-mounted projection screen 11.

[0079] Applied to the above-mentioned vehicle-mounted projection device 1, such as Figure 2 As shown, the vehicle-mounted projection screen control method provided by the present application includes the following steps:

[0080] Step 202: After the vehicle-mounted projection screen is unfolded, the actual sight direction of at least one viewing passenger is obtained.

[0081] The above-mentioned movie-watching passengers refer to users whose sight lines fall within the range of the vehicle-mounted projection screen 11 and last for more than a preset time. Users who close their eyes to sleep, look out the window, or lower their heads to check items such as mobile phones and last for more than a preset time will not be treated as movie-watching passengers.

[0082] In some embodiments, a mechanical button or remote control for turning on or off the vehicle-mounted projection device 1 is provided on the vehicle, and / or an application program released by a manufacturer to control the vehicle-mounted projection device 1 is installed on the vehicle-mounted display screen. The user sends an opening command to the vehicle-mounted projection device 1 through the mechanical button, remote control or application program, and after receiving the opening command, the controller of the vehicle-mounted projection device 1 sends a screen unfolding command to the reeling drive mechanism 13, and after receiving the screen unfolding command, the reeling drive mechanism 13 unfolds the vehicle-mounted projection screen 11 in the vertical direction.

[0083] When the vehicle-mounted projection screen 11 is unfolded, the eye images of the passengers watching the movie on the rear seats are captured by a high-frame rate camera. The high-frame rate camera usually has a high resolution and sensitivity, so that eye details can be clearly obtained under various lighting conditions. In order to better capture the eye images of each passenger watching the movie on the rear seats, cameras are arranged on both sides of the vehicle-mounted projection screen 11.

[0084] After capturing the eye image of the viewing passenger, image processing techniques such as edge detection, threshold segmentation and morphological operations are used to extract key features from the eye image, including the pupil center and corneal reflection point, and the actual line of sight direction is calculated based on the relative position relationship between the pupil center and the corneal reflection point. Among them, the pupil center is usually expressed as a circular area, which can be located by Hough transform or other circle detection algorithms; the corneal reflection point is a very bright small dot that is easy to distinguish from other features.

[0085] In some embodiments, a geometric model of the eye is established, and the coordinates of the key features actually measured are substituted into the model. The actual line of sight direction is obtained by solving the optimization algorithm. When optimizing the model, factors such as the position and angle of the head relative to the trunk, the position and angle of the pupil relative to the eye, and the eyelid occlusion of the eyeball can be considered to improve the calculation accuracy. In order to improve the accuracy, calibration is usually required. The user looks at a series of target points of known positions on the vehicle-mounted projection screen 11, and the user's eye image is captured and processed by the camera to obtain the key feature position of the eye at this time, calculate the user's line of sight direction at this time, and then compare the actual line of sight direction with the calculated line of sight direction to compensate for individual differences caused by factors such as the size and shape of the eyeball and reduce errors.

[0086] Step 204, calculating a sight line deviation angle between at least one of the actual sight line directions and the simulated direct sight line direction, calculating an angle adjustment value according to at least one of the sight line deviation angles, and generating a control signal according to the angle adjustment value.

[0087] When the movie-watching passengers watch movies at a specific position and at a specific angle, such as sitting upright on the seat or leaning slightly on the seat but with their eyes looking straight ahead, the viewing effect can be guaranteed; however, when the movie-watching passengers adjust the seat back so that the upper body tilts backward, the viewing direction of the movie-watching passengers' eyes will deflect upward. At this time, if the viewing effect at a specific position and a specific angle is to be guaranteed, the eyeballs need to turn downward. If the eyeballs remain in this state for a long time, it will cause discomfort to the eyes of the movie-watching passengers, thereby affecting the viewing experience of the movie-watching passengers. Therefore, in order to ensure that the viewing experience of the movie-watching passengers is still good when their posture changes, the present application adaptively adjusts the inclination angle of the vehicle-mounted projection screen 11 according to the changes in the viewing direction of the movie-watching passengers.

[0088] When the vehicle-mounted projection screen 11 is in the vertically unfolded state, in order to ensure a better viewing effect, the viewing passenger needs to look directly at the vehicle-mounted projection screen 11. Therefore, in order to identify the change in the viewing passenger's actual viewing direction relative to the direct viewing direction, after obtaining the viewing passenger's actual viewing direction, combined with Figure 3 To illustrate, a relative coordinate system is established with the top center of the vehicle-mounted projection screen 11 as the origin, the front direction of the vehicle as the X-axis, the rotation axis of the vehicle-mounted projection screen 11 as the Y-axis, and the unfolding direction of the vehicle-mounted projection screen 11 as the Z-axis; the direct line of sight of the movie-watching passenger is simulated in the relative coordinate system, and the direct line of sight direction is simulated according to the position and angle of the head of the movie-watching passenger relative to the torso; and then the angle between the actual line of sight direction and the direct line of sight direction is calculated to obtain the line of sight deviation angle.

[0089] Combination Figure 4 To explain, Figure 4 In the middle, A is the line of sight deviation angle, which can reflect the change in the line of sight direction of the movie-watching passengers from the ideal direct line of sight direction to the actual line of sight direction at the current moment. The inclination angle of the vehicle-mounted projection screen 11 is adjusted according to the line of sight deviation angle, so that the inclination angle of the vehicle-mounted projection screen 11 can be matched with the actual line of sight direction of the movie-watching passengers, so that the movie-watching passengers can watch the movie in a comfortable posture, and the viewing effect can be guaranteed without maintaining an upright sitting posture, thereby improving the viewing experience of the movie-watching passengers.

[0090] The vehicle-mounted projection screen 11 control method of the present application can be applied to vehicles with four seats or more. Considering that there may be more than one viewing passenger, when there is only one viewing passenger, the viewing deviation angle is calculated according to the angle between the actual viewing direction of this viewing passenger and the corresponding direct viewing direction, and then the angle adjustment value is obtained according to the viewing deviation angle; when there is more than one viewing passenger, in order to comprehensively consider the actual viewing direction of each viewing passenger, the actual viewing direction of each viewing passenger is obtained respectively, and the direct viewing direction of each viewing passenger is simulated in the above-mentioned relative coordinate system; the corresponding viewing deviation angles are calculated according to the angle between the actual viewing direction of each viewing passenger and the corresponding direct viewing direction; and the angle adjustment value is calculated by comprehensively calculating the viewing deviation angles, and the inclination angle of the vehicle-mounted projection screen 11 is adjusted according to the angle adjustment value, which can take into account the viewing effect of each viewing passenger at the same time.

[0091] After the angle adjustment value is obtained, a corresponding control signal is generated according to the angle adjustment value, and the control signal is sent to the winding drive mechanism 13, so that the winding drive mechanism 13 responds to the control signal, thereby controlling the vehicle-mounted projection screen 11 to rotate to the angle adjustment value.

[0092] Step 206: The winding drive mechanism drives the screen support mechanism to rotate the angle adjustment value in response to the control signal, so that the vehicle-mounted projection screen rotates by the angle adjustment value, and the normal vector of the rotated vehicle-mounted projection screen matches the actual line of sight direction.

[0093] After receiving the control signal, the winding drive mechanism 13 parses the angle adjustment value from the control signal; since the screen support mechanism 12 supports the vehicle-mounted projection screen 11, the vehicle-mounted projection screen 11 can be driven to rotate the angle adjustment value by driving the screen support mechanism 12, thereby changing the inclination angle of the vehicle-mounted projection screen 11 relative to the vertical plane or the horizontal plane, such as Figure 4 As shown, Figure 4 A is the line of sight deviation angle; moreover, after the vehicle-mounted projection screen 11 is adjusted from the vertically unfolded state to the inclined unfolded state, it can still remain flat under the support of the screen support mechanism 12, thereby ensuring the flatness of the projection picture.

[0094] When the driving mechanism drives the screen support mechanism 12 to rotate, the rotation direction of the screen support mechanism 12 is determined according to the vertical position relationship between the actual sight line direction of the viewing passenger and the corresponding direct sight line direction, so as to ensure that the normal vector of the vehicle-mounted projection screen 11 matches the actual sight line direction of the viewing passenger after rotation. Exemplarily: taking the front direction of the vehicle as the forward direction, if the actual sight line direction of the viewing passenger is located above the direct sight line direction in the vertical direction, the winding driving mechanism 13 drives the screen support mechanism 12 to rotate forward, and stops driving when the rotation angle reaches the angle adjustment value; if the actual sight line direction of the viewing passenger is located below the direct sight line direction in the vertical direction, the winding driving mechanism 13 drives the screen support mechanism 12 to rotate backward, and stops driving when the rotation angle reaches the angle adjustment value.

[0095] The above-mentioned vehicle-mounted projection screen control method is applied to a vehicle-mounted projection device, and the vehicle-mounted projection device is configured such that its winding drive mechanism can not only wind up or unfold the vehicle-mounted projection screen, but also drive the screen support mechanism that provides support force for the vehicle-mounted projection screen to rotate in the front-to-back direction, thereby driving the vehicle-mounted projection screen to rotate forward and backward; based on the vehicle-mounted projection device, when the vehicle-mounted projection screen is unfolded, the line of sight deviation angle between the actual line of sight direction of the viewing passenger and the corresponding direct line of sight direction is calculated; the angle adjustment value is calculated according to the line of sight deviation angle, and a corresponding control signal is generated according to the angle adjustment value; the winding drive mechanism responds to the control signal, drives the screen support mechanism to rotate the angle adjustment value, thereby driving the vehicle-mounted projection screen to rotate the corresponding angle to change the inclination angle of the vehicle-mounted projection screen. Therefore, the vehicle-mounted projection screen control method of the present application can match the actual line of sight direction of the viewing passenger, so that the viewing passenger can watch the movie in a comfortable posture, and can ensure a better viewing effect without maintaining an upright sitting posture, thereby improving the flexibility of the screen control and the viewing experience of the viewing passenger.

[0096] In a specific embodiment, in combination Figure 3 , 5 For explanation, the calculation of the sight deviation angle between at least one actual sight line direction and the corresponding direct sight line direction in the above step 202 includes: for each viewing passenger, according to the position and angle of the viewing passenger's head relative to the torso, simulating the sight line direction of the viewing passenger's eyes looking directly at the vehicle-mounted projection screen 11, that is, the direct sight line direction; on the plane formed by the X-axis and the Z-axis of the relative coordinate system, by obtaining the actual sight line landing point where the actual sight line direction falls on the vehicle-mounted projection screen 11 and the reference sight line landing point where the direct sight line direction falls on the vehicle-mounted projection screen 11; according to the actual sight line landing point and the reference sight line landing point The corresponding longitudinal deviation distance is obtained according to the distance between the actual sight point and the eyes of the viewing passenger; the corresponding actual sight distance is obtained according to the longitudinal deviation distance and the actual sight distance; the angle between the actual sight direction and the direct sight direction, i.e. the sight deviation angle, is calculated using the sine function and the inverse sine function according to the longitudinal deviation distance and the actual sight distance; the mathematical expressions used include: sinA=a / b, A=arcsin(a / b), sin represents the sign of the sine function, A represents the sight deviation angle, a represents the longitudinal deviation distance, b represents the actual sight distance, and arcsin represents the sign of the inverse sine function.

[0097] In another specific embodiment, in combination Figure 3 , 6For explanation, the calculation of the sight deviation angle between at least one actual sight direction and the corresponding direct sight direction in the above step 202 includes: for each viewing passenger, according to the position and angle of the viewing passenger's head relative to the torso, simulating the sight direction of the viewing passenger's eyes looking directly at the vehicle-mounted projection screen 11, that is, the direct sight direction; on the plane formed by the X-axis and the Z-axis of the relative coordinate system, for each actual sight direction, obtaining the distance from the viewing passenger to the vehicle-mounted projection screen 11 along the actual sight direction, that is, the actual sight distance, and the distance from the viewing passenger to the vehicle-mounted projection screen 11 along the direct sight direction, that is, the reference sight distance; according to the reference sight distance and the actual sight distance, using the cosine function and the inverse cosine function to calculate the angle between the actual sight direction and the direct sight direction, that is, the sight deviation angle; the mathematical expressions used include: cosA=c / b, A=arccos(c / b), cos represents the sign of the cosine function, A represents the sight deviation angle, c represents the reference sight distance, b represents the actual sight distance, and arccos represents the sign of the inverse cosine function.

[0098] In a specific implementation, for calculating the angle adjustment value according to at least one sight line deviation angle in the above step 202, since the number of movie-watching passengers may be more than one, it is necessary to calculate the angle adjustment value according to the number of movie-watching passengers. As an example, if there is only one movie-watching passenger, the sight line deviation angle corresponding to this movie-watching passenger is directly used as the angle adjustment value; if there are more than one movie-watching passenger, in order to comprehensively consider the actual sight line direction of each movie-watching passenger, a weighted calculation or an average value is calculated according to the sight line deviation angle corresponding to each movie-watching passenger to obtain the angle adjustment value, and the inclination angle of the vehicle-mounted projection screen 11 is adjusted according to the angle adjustment value, so that the viewing effect of each movie-watching passenger can be taken into account at the same time.

[0099] In some scenarios, when the posture of the movie-watching passengers changes slightly, the eyeballs will also rotate slightly with the posture, and this slight rotation may not cause discomfort to the eyes of the movie-watching passengers even if it lasts for a long time. Therefore, as another example, in order to improve the control accuracy of the vehicle-mounted projection screen 11 and filter out situations where the vehicle-mounted projection screen 11 does not need to be adjusted, this application presets an angle critical value through a real vehicle calibration test. When the number of movie-watching passengers is one, the difference between the line of sight deviation angle and the preset angle critical value is calculated to obtain the angle adjustment value; when the number of movie-watching passengers is more than one, in order to comprehensively consider the actual line of sight direction of each movie-watching passenger, the difference between each line of sight deviation angle and the preset angle critical value is calculated, and each difference is weighted or averaged to obtain the angle adjustment value. The inclination angle of the vehicle-mounted projection screen 11 is adjusted according to the angle adjustment value, which can take into account the viewing effect of each movie-watching passenger at the same time.

[0100] The angle critical value is 10°. Users can change the angle critical value according to their preferences through the application installed on the vehicle display screen. The change range is [5, 15]°. Taking the front direction of the vehicle as the forward direction, in one embodiment, if there are two viewing passengers in the second row, the weights corresponding to the left viewing passengers and the right viewing passengers are both set to 50%. In another embodiment, the weights are set according to the user's own preferences. For example, the user sets the priority of the left viewing passenger or the right viewing passenger according to his or her own preferences, and the system defaults the priority and non-priority weight ratio to 6:4 or 7:3. When there are two viewing passengers, the difference corresponding to each viewing passenger is weightedly calculated according to the preset viewing passenger priority items and the corresponding weight ratio to obtain the angle adjustment value. For example: the user sets the priority of the right viewing passenger, and the system defaults the priority and non-priority weight ratio to 6:4. Then the weight allocated to the difference corresponding to the right viewing passenger is 60%, and the weight allocated to the difference corresponding to the left viewing passenger is 40%. Then, the difference corresponding to the right viewing passenger and its weight and the difference corresponding to the left viewing passenger and its weight are weighted calculated to obtain the angle adjustment value.

[0101] For the above-mentioned situation where there are more than one moviegoer, in some scenes, each moviegoer may sit on the seat at a different angle. Especially when the angle difference is large, it is difficult to take into account the actual line of sight of each moviegoer at the same time; moreover, if the inclination angle of the vehicle-mounted projection screen 11 is adjusted by taking into account the actual line of sight of each moviegoer at the same time, it may result in that the adjusted vehicle-mounted projection screen 11 and the actual line of sight of each moviegoer cannot match each other, resulting in a lower viewing experience for all moviegoers.

[0102] Therefore, in a specific embodiment, when the number of moviegoers is more than one, the seat back inclination angle corresponding to each moviegoer is obtained, and then the inclination difference between the seat back inclination angles is obtained; when each inclination angle difference is less than or equal to a preset inclination angle threshold, the difference between each line of sight deviation angle and the preset angle critical value is weighted or averaged to obtain an angle adjustment value; when there is an inclination angle difference greater than the inclination threshold among all the inclination angle differences, the preset main viewing angle direction and the angle critical value are obtained, and the difference between the line of sight deviation angle from the main viewing angle direction and the angle critical value is calculated to obtain the angle adjustment value, or the line of sight deviation angle in the future main viewing angle is used as the angle adjustment value.

[0103] By presetting the main viewing angle, when the actual sight lines of the passengers differ greatly, the angle adjustment value is calculated based on the sight line deviation angle obtained in the main viewing angle direction, which can ensure the viewing effect of the passengers in the main viewing angle direction and avoid the phenomenon that the viewing effect of all passengers is not guaranteed to a certain extent. For example, the sight line direction of the passenger on the right side is used as the main sight line direction by default, and the user can also change the main viewing angle through the application installed on the vehicle display screen; if there are 3 passengers in a row of seats in the back row, the middle seat is treated as the left seat or the right seat according to the structural arrangement of the seats, and the passenger in the middle seat is treated as the left passenger or the right passenger during processing.

[0104] In some embodiments, in order to satisfy the viewing experience of most of the movie-watching passengers, the angle adjustment value is determined by determining the viewing line preference trend of all the movie-watching passengers. As an example, a first number and a second number are obtained, the first number refers to the number of inclination angle differences less than or equal to the inclination angle threshold among all inclination angle differences, and the second number refers to the number of inclination angle differences greater than the inclination angle threshold among all inclination angle differences; when the first number is greater than the second number, it means that among all the seats occupied by the movie-watching passengers, the majority of the seats have a small difference in the inclination angle of the seat backs, and the minority have a large difference in the inclination angle of the seat backs; then, the case where the difference in the inclination angle of the seat backs is small can be taken as the standard, the inclination angle difference less than or equal to the inclination angle threshold can be taken as the target inclination angle difference, the seat corresponding to the target inclination angle difference can be taken as the target seat, and the movie-watching passenger sitting on the target seat can be taken as the target movie-watching passenger, and the difference between the line of sight deviation angle of the target movie-watching passenger and the angle critical value can be weighted or averaged to obtain the angle adjustment value;

[0105] Similarly, when the first number is less than the second number, it means that among all the seats occupied by the movie-watching passengers, the majority of the seats have a large difference in the inclination angle of the seat back, while the minority of the seats have a small difference in the inclination angle of the seat back; then, the case where the inclination angle of the seat back is greatly different can be used as the standard, and the inclination difference greater than the inclination threshold can be used as the target inclination difference, the seat corresponding to the target inclination difference can be used as the target seat, and the movie-watching passenger sitting on the target seat can be used as the target movie-watching passenger, and the difference between the sight deviation angle of the target movie-watching passenger and the angle threshold can be weighted or averaged to obtain the angle adjustment value. When the first number is equal to the second number, the angle adjustment value can be calculated based on the preset main viewing angle direction.

[0106] Taking the position of the vehicle projection screen 11 as the reference position, and the front direction of the vehicle as the forward direction, the seats in front of the vehicle projection screen 11 are the front seats, and the seats behind the vehicle projection screen 11 are the back seats. Due to the limited space in the car, the gap between the vehicle projection screen 11 and the front seats is narrow. In some scenes, when the backrests of the front seats are tilted backward or the angle adjustment value is large, the rotation path of the vehicle projection screen 11 may interfere with the front seats, causing the vehicle projection screen 11 to overlap with the front seats after adjustment, so that the viewing passengers cannot see the complete projection picture, affecting the viewing experience.

[0107] Therefore, in a specific embodiment, the winding drive mechanism 13 is configured to be able to move forward and backward along the roof; before or after the winding drive mechanism 13 drives the screen support mechanism 12 to rotate the angle adjustment value, the front seat contour and the contour of the vehicle-mounted projection screen 11 after rotation are obtained; when there is an overlapping part between the front seat contour and the contour of the vehicle-mounted projection screen 11 after rotation, the longitudinal distance adjustment value required to eliminate the overlapping part is calculated, and the winding drive mechanism 13 moves backward by the longitudinal distance adjustment value. In this way, it can be ensured that the vehicle-mounted projection screen 11 remains flat after adjustment, presents a complete projection picture, and ensures the viewing experience of the viewing passengers.

[0108] Exemplarily, the front seat image is captured by a camera, and an image processing algorithm (such as the Canny edge detection algorithm) is used to identify the seat edges in the front seat image, thereby outlining the front seat contour; or the front seat image is converted into a grayscale image using a threshold segmentation method, and then one or more thresholds are set to distinguish between the background and the seat, thereby extracting the front seat contour; or the front seat contour can be constructed by scanning the front seat contour using a 4D millimeter-wave radar.

[0109] Before the winding drive mechanism 13 drives the screen support mechanism 12 to rotate the angle adjustment value, a method similar to the above-mentioned method of constructing the front seat contour can be used to construct the contour of the vehicle-mounted projection screen 11 in the vertically unfolded state, and based on the contour in the vertically unfolded state, the contour of the vehicle-mounted projection screen 11 adjusted according to the angle adjustment value can be simulated; after the winding drive mechanism 13 drives the screen support mechanism 12 to rotate the angle adjustment value, a method similar to the above-mentioned method of constructing the front seat contour can be directly used to construct the contour of the vehicle-mounted projection screen 11 after rotation.

[0110] After constructing the contours of the front seats and the contours of the vehicle-mounted projection screen 11 after rotation, if there is an overlapping portion between the two contours, a longitudinal distance adjustment value is calculated, and the longitudinal distance adjustment value refers to the longitudinal movement distance required to prevent the vehicle-mounted projection screen 11 from overlapping the front seats after rotation; the winding drive mechanism 13 is moved backward according to the longitudinal distance adjustment value so that the vehicle-mounted projection screen 11 will not interfere with the front seats.

[0111] In a specific embodiment, in Figure 3 The contours of the vehicle-mounted projection screen 11 before and after rotation are observed on the plane formed by the X-axis and the Z-axis of the relative coordinate system shown. The step of calculating the longitudinal distance adjustment value required after the vehicle-mounted projection screen 11 is rotated includes: calculating the longitudinal movement distance of the end of the vehicle-mounted projection screen 11 after the vehicle-mounted projection screen 11 is rotated by the angle adjustment value; obtaining the interval distance between the end of the vehicle-mounted projection screen 11 and the front seat before the vehicle-mounted projection screen 11 is rotated by the angle adjustment value; calculating the difference between the longitudinal movement distance and the interval distance, and obtaining the longitudinal distance adjustment value required after the vehicle-mounted projection screen 11 is rotated.

[0112] Among them, the longitudinal movement distance is the movement distance corresponding to the end of the vehicle-mounted projection screen 11 from the position before rotation to the position after rotation; the interval distance is the distance from the end of the vehicle-mounted projection screen 11 to the front seat when it is in a vertically unfolded state; therefore, by comparing the numerical values ​​of the longitudinal movement distance and the interval distance, when the longitudinal movement distance is greater than the interval distance, the longitudinal distance adjustment value can be obtained by subtracting the interval distance from the longitudinal movement distance, and when the longitudinal movement distance is less than or equal to the interval distance, there is no need to move the vehicle-mounted projection screen 11.

[0113] When the inclination angle of the vehicle-mounted projection screen 11 changes, the lens of the vehicle-mounted projection optical machine needs to be adjusted accordingly. Therefore, in a specific embodiment, the vehicle-mounted projection device 1 also includes a vehicle-mounted projection optical machine, and the lens of the vehicle-mounted projection optical machine is configured to be able to rotate up and down, left and right according to the inclination angle of the vehicle-mounted projection screen 11, so as to ensure that the vehicle-mounted projection screen 11 can obtain the best projection picture effect at any inclination angle. Among them, exemplarily, for a four-seat or five-seat vehicle, the vehicle-mounted projection optical machine is arranged on the roof position behind the second row of seats; for a seven-seat vehicle, the vehicle-mounted projection optical machine is arranged on the roof position between the second row of seats and the third row of seats.

[0114] After the vehicle-mounted projection screen 11 is adjusted, the following steps are also included: the vehicle-mounted projection optical machine is turned on and starts projecting; during the viewing process of at least one passenger, the step of obtaining the actual sight line direction of at least one passenger is returned, and after generating a control signal, the control signal is also sent to the vehicle-mounted projection optical machine, the vehicle-mounted projection optical machine parses the angle adjustment value from the control signal, and adaptively rotates the lens according to the angle adjustment value, so as to adaptively adjust the projection angle of the vehicle-mounted projection optical machine according to the inclination angle of the vehicle-mounted projection screen 11, thereby providing the passengers with a good viewing experience during the viewing process.

[0115] Since the rotation angle of the lens of a general vehicle-mounted projection optical machine is limited, for such vehicle-mounted projection optical machine, after the vehicle-mounted projection optical machine analyzes the angle adjustment value, if the angle adjustment value is less than or equal to the maximum angle adjustment value of the vehicle-mounted projection optical machine, the lens of the vehicle-mounted projection optical machine rotates according to the angle adjustment value; if the angle adjustment value is greater than the maximum angle adjustment value, the lens of the vehicle-mounted projection optical machine rotates according to the maximum angle adjustment value, and after the rotation, the projection image on the vehicle-mounted projection screen 11 is corrected. Among them, when the actual line of sight direction is higher than the direct line of sight direction, the rotation direction of the lens of the vehicle-mounted projection optical machine is upward, and when the actual line of sight direction is lower than the direct line of sight direction, the rotation direction of the lens of the vehicle-mounted projection optical machine is downward.

[0116] In order to improve the control accuracy of the lens of the vehicle-mounted projection screen 11 and the vehicle-mounted projection optical machine, the situation where the actual line of sight direction of the viewing passengers changes briefly is screened out. In some embodiments, a line of sight change duration threshold is set; when the actual line of sight direction or the line of sight deviation angle obtained lasts for a period of time that reaches or exceeds the line of sight change duration threshold, the angle adjustment value is calculated to adjust the vehicle-mounted projection screen 11 and the vehicle-mounted projection optical machine; when the actual line of sight direction or the line of sight deviation angle obtained lasts for a period of time that does not reach the line of sight change duration threshold, there is no need to calculate the angle adjustment value and perform subsequent steps of adjusting the vehicle-mounted projection screen 11 and the vehicle-mounted projection optical machine. Exemplarily, the line of sight change duration threshold can be set to 20s, and users can also change the value of the line of sight change duration threshold according to their own preferences through the application installed on the vehicle display screen.

[0117] In some scenarios, the movie-watching passengers may fall asleep during the movie-watching process and may not watch the movie for a long time. In order to reduce manual operations by users, in some embodiments, a threshold for the length of time without watching the movie is set; during the movie-watching process, the actual line of sight direction of each movie-watching passenger is monitored in real time; when it is detected that the actual line of sight direction of each movie-watching passenger is not within the visible range of the vehicle-mounted projection screen 11 and the duration exceeds the threshold for the length of time without watching the movie, the movie-watching passenger is automatically prompted by voice whether to turn off the vehicle-mounted projection device 1; after receiving the reply from the movie-watching passenger confirming to turn off the vehicle-mounted projection screen 11, the vehicle-mounted projection device 1 is automatically turned off; if a reply from the movie-watching passenger is received that the vehicle-mounted projection device 1 does not need to be turned off, the current state of the vehicle-mounted projection screen 11 is maintained until the actual line of sight direction of any movie-watching passenger is detected to return to the visible range of the vehicle-mounted projection screen 11 again, and the lens of the vehicle-mounted projection screen 11 and the vehicle-mounted projection optical machine are adjusted according to the latest actual line of sight direction. Exemplarily, the time threshold for not watching a movie can be set to 5 minutes, and the user can also change the value of the time threshold for not watching a movie according to his or her preferences through an application installed on the vehicle display screen.

[0118] In some scenarios, there may be a situation where the movie-watching passengers have not watched the movie for a long time and have not instructed to turn off the vehicle-mounted projection device 1. In order to automatically turn off the vehicle-mounted projection device 1 in this case to save energy, when no reply is received from any of the movie-watching passengers and the actual line of sight of each movie-watching passenger has not returned to the visible range of the vehicle-mounted projection screen 11, and the duration exceeds a certain period, the vehicle-mounted projection device 1 is directly turned off.

[0119] In some embodiments, in order to provide a better lighting environment during the movie watching process, a light sensor is also installed on the roof, and the window glass adopts smart window glass; the light sensor is used to detect the light conditions inside the car in real time, and then adjust the brightness of the lights on the rear seats and the brightness of the smart windows according to the light conditions; a movie watching privacy mode is provided. When the user selects the movie watching privacy mode through a pre-installed application, the rear window and rear windshield are automatically adjusted to a completely black state. At this time, the system will turn on the streaming media rearview mirror mode through the rear camera to view the road conditions behind the vehicle.

[0120] In some scenarios, the front passengers may adjust the front seat backrests. When the adjustment angle exceeds a certain angle, the vehicle-mounted projection screen 11 may interfere with the front seats when it is opened and unfolded downward, causing the vehicle-mounted projection screen 11 to be unable to keep the picture flat after it is fully unfolded, affecting the viewing experience of the rear passengers. To this end, in some embodiments, the positions of the vehicle-mounted projection screen 11 and the front seats are detected by a position sensor to obtain the minimum distance between the vehicle-mounted projection screen 11 and the front seats; if the minimum distance is not less than a preset distance threshold, for example, 10 mm, the vehicle-mounted projection screen 11 is directly unfolded; if the minimum distance is less than the distance threshold, the camera is used to detect whether there are occupants in the front seats; if there are no occupants in the front seats, the front seats are moved forward until the minimum distance is not less than the distance threshold, then the movement is stopped, and the vehicle-mounted projection screen 11 is unfolded; if there are occupants in the front seats, the winding drive mechanism 13 is moved backward, driving the vehicle-mounted projection screen 11 to move backward until the minimum distance is not less than the distance threshold, then the movement is stopped, and the vehicle-mounted projection screen 11 is unfolded.

[0121] In some scenarios, the winding drive mechanism 13 drives the vehicle-mounted projection screen 11 to move to the end and still cannot meet the requirement that the minimum distance is not less than the distance threshold. Therefore, in some embodiments, in this case, a voice prompt is given to the front passenger whether to move the front seat; if a reply is received from the front passenger agreeing to move the front seat, the front seat is moved forward until the minimum distance is not less than the distance threshold; if a reply is received from the front passenger disagreeing to move the front seat, the start of the vehicle-mounted projection device 1 is terminated.

[0122] When the vehicle-mounted projection screen 11 is close to the rear seats, it will cause discomfort to the eyes of the rear-row passengers, reducing the viewing experience of the passengers. Therefore, in some embodiments, in order to improve the viewing effect, an optimal viewing distance is set between the vehicle-mounted projection screen 11 and the rear seats; the positions of the vehicle-mounted projection screen 11 and the rear seats are detected by a position sensor to obtain the distance between the vehicle-mounted projection screen 11 and the rear seats; if the distance does not meet the optimal viewing distance, the rear seats are moved until the distance between the rear seats and the vehicle-mounted projection screen 11 meets the optimal viewing distance. The optimal viewing distance can be a default value developed by the manufacturer, and the user can also change the value of the optimal viewing distance through a pre-installed application according to his or her preferences.

[0123] It should be understood that although Figure 2 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 2At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0124] In one embodiment, in combination Figure 1 , 7 To illustrate, a vehicle-mounted projection screen control device is provided, which is applied to a vehicle-mounted projection device 1, and the vehicle-mounted projection device 1 includes: a vehicle-mounted projection screen 11, a screen support mechanism 12 and a winding drive mechanism 13, wherein:

[0125] A screen support mechanism 12, used to provide support when the vehicle-mounted projection screen 11 is in an unfolded state;

[0126] The winding drive mechanism 13 is used to wind up or unfold the vehicle-mounted projection screen 11, and control the screen support mechanism 12 to rotate forward and backward, so that the vehicle-mounted projection screen 11 rotates forward and backward to change the inclination angle of the vehicle-mounted projection screen 11 relative to the horizontal plane or the vertical plane.

[0127] like Figure 7 As shown, the vehicle-mounted projection screen control device includes: a detection module and a control module, wherein:

[0128] A detection module, used for obtaining the actual sight line direction of at least one viewing passenger when the vehicle-mounted projection screen is unfolded;

[0129] A control module, configured to calculate a sight line deviation angle between at least one of the actual sight line directions and a simulated direct sight line direction, calculate an angle adjustment value according to at least one of the sight line deviation angles, and generate a control signal according to the angle adjustment value;

[0130] The winding drive mechanism 13 drives the screen support mechanism 12 to rotate the angle adjustment value in response to the control signal, so that the vehicle-mounted projection screen 11 rotates the angle adjustment value, and the normal vector of the rotated vehicle-mounted projection screen 11 matches the actual line of sight direction.

[0131] In a specific embodiment, the winding drive mechanism 13 is installed on the roof and is located behind the driver's seat and the co-driver's seat, and extends along the width direction of the vehicle, suitable for winding the vehicle-mounted projection screen 11 into the cavity of the roof or unfolding it in the vertical direction.

[0132] In a specific embodiment, the screen support mechanism 12 is arranged on the back side of the vehicle-mounted projection screen 11, that is, the side away from the projection direction, and is configured to be able to extend and / or fold along the rolling or unfolding direction of the vehicle-mounted projection screen 11 under the driving force of the rolling drive mechanism 13. Since the extension and / or folding of the screen support mechanism 12 is performed on the back side of the vehicle-mounted projection screen 11, although the rolling or unfolding of the vehicle-mounted projection screen 11 and the extension and / or folding of the screen support mechanism 12 occur simultaneously, there is no interference between them.

[0133] The winding drive mechanism 13 drives the vehicle-mounted projection screen 11 to unfold and drives the screen support mechanism 12 to extend or open. The screen support mechanism 12 provides support when the vehicle-mounted projection screen 11 is in the unfolded state, so that the vehicle-mounted projection screen 11 remains flat, thereby improving the phenomenon that the flatness of the vehicle-mounted projection screen 11 is reduced due to special road conditions such as bumpy roads during vehicle driving; and the winding drive mechanism 13 drives the vehicle-mounted projection screen 11 to rewind and drives the screen support mechanism 12 to shorten or fold. When the vehicle-mounted projection screen 11 is in the rolled-up state, the screen support mechanism 12 follows the vehicle-mounted projection screen 11 to be stored in the cavity on the roof.

[0134] In a specific embodiment, the detection module includes at least two cameras, and at least two cameras are arranged near the top of the vehicle-mounted projection screen 11, and the detection direction is toward the rear seats to detect the rear passengers and their lines of sight. For example: if there are two cameras, the two cameras are respectively arranged on both sides of the top of the vehicle-mounted projection screen 11 to detect the rear passengers and their lines of sight.

[0135] In a specific implementation, the control module is a module for controlling the vehicle-mounted projection device 1 , and may be arranged in the floor below the seat to control the entire vehicle-mounted projection device 1 .

[0136] In a specific embodiment, the winding drive mechanism 13 is provided with a rotating rod along its length extension direction, and the rotating rod is rotatably connected to both ends of the winding drive mechanism 13. The winding drive mechanism 13 is also provided with a driving source for driving the rotating rod to rotate with its own central axis as the rotating axis. Exemplarily, the driving source is a motor; the rotating rod is fixedly connected to the screen support mechanism 12. When the winding drive mechanism 13 drives the rotating rod to rotate, the rotating rod drives the screen support mechanism 12 to rotate, thereby driving the vehicle-mounted projection screen 11 to rotate, so as to adjust the inclination angle of the vehicle-mounted projection screen 11.

[0137] In a specific embodiment, the winding drive mechanism 13 is connected to the control module for communication. The control module sends the generated control signal to the winding drive mechanism 13. The winding drive mechanism 13 responds to the control signal, parses the angle adjustment value, and drives the rotating rod to rotate the angle adjustment value through the driving source. When the actual line of sight direction is higher than the direct line of sight direction, the rotation direction is upward. When the actual line of sight direction is lower than the direct line of sight direction, the rotation direction is downward. The screen support mechanism 12 rotates the corresponding angle following the rotating rod, and drives the vehicle-mounted projection screen 11 to rotate the corresponding angle.

[0138] Since the vehicle-mounted projection screen 11 is generally made of a flexible material, in order to ensure that the vehicle-mounted projection screen 11 can remain flat after being rotated, in a specific implementation manner, Figure 8 To illustrate, the curtain support mechanism 12 includes: a crossbar 121, two first telescopic rods 122, two folding rods 123 and a second telescopic rod 124, wherein:

[0139] A cross bar 121, installed at the end of the vehicle-mounted projection screen 11, provides support when the vehicle-mounted projection screen 11 is in an unfolded state, so that the vehicle-mounted projection screen 11 remains in the unfolded state;

[0140] Two first telescopic rods 122 are respectively located at the two side edges of the side of the vehicle-mounted projection screen 11 away from the projection direction, and are installed between the winding drive mechanism 13 and the cross bar 121, and are telescopic when the winding drive mechanism 13 unfolds or winds up the vehicle-mounted projection screen 11;

[0141] Two folding rods 123, two ends of each folding rod 123 are rotatably connected to two ends of the first telescopic rod 122, and each folding rod 123 is opened or folded when the rolling drive mechanism 13 unfolds or rolls up the vehicle-mounted projection screen 11;

[0142] The second telescopic rod 124 has two ends respectively fixed to the folded portions of the two folding rods 123 , and is telescopic when the two folding rods 123 are opened or folded.

[0143] In a specific embodiment, one end of the two first telescopic rods 122 is fixedly connected to the rotating rod in the winding drive mechanism 13, and the other end is fixedly connected to the cross bar 121; Fig. 9For explanation, each folding rod 123 includes a first unit rod 1231 and a second unit rod 1232, and both ends of the first unit rod 1231 are rotatably connected to one end of the first telescopic rod 122 close to the winding drive mechanism 13 and one end of the second unit rod 1232 respectively, and the other end of the second unit rod 1232 is rotatably connected to one end of the first telescopic rod 122 close to the cross bar 121, and the rotation axes of the first unit rod 1231 and the second unit rod 1232 are both perpendicular to the vertically unfolded vehicle-mounted projection screen 11; the first unit rod 1231 and the second unit rod 1232 of each folding rod 123 are rotatably connected by a connecting piece, and the second telescopic rod 124 is fixedly connected to the connecting pieces of the two folding rods 123 respectively.

[0144] In this way, when the winding drive mechanism 13 vertically unfolds the vehicle-mounted projection screen 11, the two first telescopic rods 122 extend as the vehicle-mounted projection screen 11 unfolds downward; at the same time, for each folding rod 123, the end of the first unit rod 1231 close to the second unit rod 1232 rotates downward, and the end of the second unit rod 1232 close to the cross bar 121 also rotates downward, so that the entire folding rod 123 is opened; the second telescopic rod 124 extends as the two folding rods 123 are opened, thereby supporting the vertically unfolded vehicle-mounted projection screen 11.

[0145] When the rolling-up driving mechanism 13 rolls up the vehicle-mounted projection screen 11, the two first telescopic rods 122 shorten as the vehicle-mounted projection screen 11 rolls up; at the same time, for each folding rod 123, the end of the first unit rod 1231 close to the second unit rod 1232 rotates upward, and the end of the second unit rod 1232 close to the cross bar 121 also rotates upward, so that the entire folding rod 123 is folded; the second telescopic rod 124 shortens as the two folding rods 123 are folded; when the vehicle-mounted projection screen 11 is rolled up, the first telescopic rod 122 shortens to the shortest and follows the vehicle-mounted projection screen 11 to be stored in the cavity on the roof, the two folding rods 123 are folded to overlap and are parallel to the length direction of the vehicle-mounted projection screen 11, the second telescopic rod 124 shortens to the shortest and is on the same central axis as the fully folded folding rod 123, and the two folding rods 123 and the second telescopic rod 124 are together with the vehicle-mounted projection screen 11 to be stored in the cavity on the roof.

[0146] When the reeling drive mechanism 13 drives the rotating rod to rotate, the rotating rod drives the two first telescopic rods 122 to rotate, the two first telescopic rods 122 respectively drive the connected folding rods 123 to rotate, and the two folding rods 123 drive the second telescopic rods 124 to rotate, thereby realizing the rotation of the entire screen support mechanism 12 and the vehicle-mounted projection screen 11. During the rotation of the vehicle-mounted projection screen 11, the two first telescopic rods 122 provide support for the edge of the vehicle-mounted projection screen 11, and the two folding rods 123 and the second telescopic rod 124 provide support for the middle area of ​​the vehicle-mounted projection screen 11, thereby ensuring the flatness of the vehicle-mounted projection screen 11 during and after the rotation, and ensuring the viewing effect of the viewing passengers.

[0147] In a specific embodiment, the control module is used to calculate the angle adjustment value based on at least one of the sight line deviation angles, specifically including: when the number of the movie-watching passengers is one, calculating the difference between the sight line deviation angle and a preset angle critical value to obtain the angle adjustment value; when the number of the movie-watching passengers is more than one, performing a weighted calculation on the difference between each of the sight line deviation angles and the preset angle critical value to obtain the angle adjustment value.

[0148] In a specific embodiment, the control module is used to perform weighted calculation on the difference between each sight line deviation angle and a preset angle critical value to obtain the angle adjustment value when the number of the movie-watching passengers is more than one, including: obtaining the inclination difference between the seat backs corresponding to each of the movie-watching passengers; when each of the inclination differences is less than or equal to a preset inclination threshold, performing weighted calculation on the difference between each of the sight line deviation angles and a preset angle critical value to obtain the angle adjustment value; when there is an inclination difference greater than the inclination threshold among all the inclination differences, obtaining a preset main viewing angle direction and an angle critical value, calculating the difference between the sight line deviation angle from the main viewing angle direction and the angle critical value, and obtaining the angle adjustment value.

[0149] In a specific embodiment, the winding drive mechanism is configured to be able to move forward and backward along the roof; before or after the winding drive mechanism drives the screen support mechanism to rotate the angle adjustment value, the detection module is also used to obtain the contour of the front seats and the contour of the vehicle-mounted projection screen after rotation; the control module is also used to calculate the longitudinal distance adjustment value required after the vehicle-mounted projection screen is rotated when there is an overlapping part between the contour of the front seats and the contour of the vehicle-mounted projection screen after rotation, and the winding drive mechanism moves backward by the longitudinal distance adjustment value.

[0150] In a specific implementation, the control module is used to calculate the longitudinal distance adjustment value required after the vehicle-mounted projection screen is rotated, specifically including: calculating the longitudinal movement distance of the end of the vehicle-mounted projection screen after the vehicle-mounted projection screen is rotated by the angle adjustment value; obtaining the interval distance from the end of the vehicle-mounted projection screen to the front seat before the vehicle-mounted projection screen is rotated by the angle adjustment value; when the longitudinal movement distance is greater than the interval distance, calculating the longitudinal distance adjustment value required to eliminate the overlapping part, and obtaining the longitudinal distance adjustment value required after the vehicle-mounted projection screen is rotated.

[0151] In a specific embodiment, the control module is used to calculate the line of sight deviation angle between at least one of the actual line of sight directions and the simulated direct line of sight direction, specifically including: for each of the actual line of sight directions, obtaining the actual line of sight landing point where the actual line of sight direction falls on the vehicle-mounted projection screen and the reference line of sight landing point where the direct line of sight direction falls on the vehicle-mounted projection screen; obtaining the longitudinal deviation distance between the actual line of sight landing point and the reference line of sight landing point and the actual line of sight distance between the actual line of sight landing point and the eyes of the viewing passenger; and calculating the line of sight deviation angle between the actual line of sight direction and the direct line of sight direction based on the longitudinal deviation distance and the actual line of sight distance.

[0152] In a specific implementation, the control module is used to calculate the line of sight deviation angle between at least one of the actual line of sight directions and the simulated direct line of sight direction, specifically including: for each of the actual line of sight directions, obtaining the actual line of sight distance of the viewing passenger along the actual line of sight direction to the vehicle-mounted projection screen and the reference line of sight distance along the direct line of sight direction to the vehicle-mounted projection screen; and calculating the line of sight deviation angle between the actual line of sight direction and the direct line of sight direction based on the reference line of sight distance and the actual line of sight distance.

[0153] For the specific definition of the vehicle-mounted projection screen control device, please refer to the definition of the vehicle-mounted projection screen control method above, which will not be repeated here. Each module in the above-mentioned vehicle-mounted projection screen control device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0154] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Fig.10As shown. The computer device includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as the actual sight direction of the viewing passengers. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a vehicle-mounted projection screen control method is implemented.

[0155] Those skilled in the art will understand that Fig.10 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0156] In one embodiment, a vehicle is provided, the vehicle comprising the vehicle-mounted projection screen control device described in the aforementioned embodiment, the vehicle-mounted projection screen control device being used to execute the steps of the vehicle-mounted projection screen control method described in the aforementioned embodiment.

[0157] If the technical solution of this application involves personal information, the product using the technical solution of this application has clearly informed the personal information processing rules and obtained the individual's voluntary consent before processing personal information. If the technical solution of this application involves sensitive personal information, the product using the technical solution of this application has obtained the individual's separate consent before processing sensitive personal information, and at the same time meets the "explicit consent" requirement. For example, for steps such as capturing the eye image of the movie-watching passenger through a camera to obtain the actual line of sight of the movie-watching passenger, a clear and obvious sign is set at the camera and other personal information collection devices to inform that the personal information collection scope has been entered and personal information will be collected. If the individual voluntarily enters the collection scope, it is deemed to agree to the collection of his or her personal information; or on the device for processing personal information, when the personal information processing rules are notified by obvious signs / information, the individual's authorization is obtained by means of pop-up information or by asking the individual to upload his or her personal information. For example, after unfolding the car projection screen, the preset personal information processing rules are projected onto the car projection screen through the car projection optical machine, and options such as "accept / agree" and "reject / disagree" are provided for the user to choose. Among them, the personal information processing rules may include information such as the personal information processor, the purpose of personal information processing, the processing method, and the type of personal information processed. In addition, to improve the security of personal privacy, information such as eye images collected by personal information collection devices such as cameras can be saved offline or stored in a personal storage network disk.

[0158] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0159] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0160] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A vehicle-mounted projection screen control method, characterized in that: Applied to a vehicle-mounted projection device, the vehicle-mounted projection device comprises: Car projection screen; A screen support mechanism, used to provide support when the vehicle-mounted projection screen is in an unfolded state; A winding drive mechanism, used for winding or unfolding the vehicle-mounted projection screen, and controlling the screen support mechanism to rotate forward and backward, so that the vehicle-mounted projection screen rotates forward and backward to change the inclination angle of the vehicle-mounted projection screen relative to a horizontal plane or a vertical plane; The method comprises: When the vehicle-mounted projection screen is unfolded, obtaining the actual sight direction of at least one viewing passenger; Calculating a sight line deviation angle between at least one of the actual sight line directions and a simulated direct sight line direction, calculating an angle adjustment value according to at least one of the sight line deviation angles, and generating a control signal according to the angle adjustment value; The winding drive mechanism drives the screen support mechanism to rotate the angle adjustment value in response to the control signal, so that the vehicle-mounted projection screen rotates by the angle adjustment value, and the normal vector of the rotated vehicle-mounted projection screen matches the actual line of sight direction.

2. The vehicle-mounted projection screen control method according to claim 1, characterized in that: Calculating an angle adjustment value according to at least one of the sight line deviation angles comprises: When the number of the movie-watching passenger is one, calculating the difference between the sight line deviation angle and a preset angle critical value to obtain the angle adjustment value; When the number of the movie-watching passengers is more than one, a weighted calculation is performed on the difference between each sight line deviation angle and a preset angle critical value to obtain the angle adjustment value.

3. The vehicle-mounted projection screen control method according to claim 2, characterized in that: When the number of the movie-watching passengers is more than one, weighted calculation is performed on the difference between each sight line deviation angle and a preset angle threshold value to obtain the angle adjustment value, including: Obtaining the inclination angle difference between the seat backs corresponding to the movie-watching passengers; When each of the inclination angle differences is less than or equal to a preset inclination angle threshold, weighted calculation is performed on the difference between each of the sight line deviation angles and a preset angle critical value to obtain the angle adjustment value; When there is an inclination difference greater than the inclination threshold value among all the inclination differences, the preset main viewing angle direction and angle critical value are obtained, and the difference between the line of sight deviation angle from the main viewing angle direction and the angle critical value is calculated to obtain the angle adjustment value.

4. The vehicle-mounted projection screen control method according to claim 1, characterized in that: The winding drive mechanism is configured to be able to move forward and backward along the roof; Before or after the rolling drive mechanism drives the curtain support mechanism to rotate the angle adjustment value, the method further includes: Obtaining the contour of the front seats and the contour of the vehicle-mounted projection screen after rotation; In the case where there is an overlapping portion between the contour of the front seat and the contour of the vehicle-mounted projection screen after rotation, a longitudinal distance adjustment value required after the vehicle-mounted projection screen is rotated is calculated, and the winding drive mechanism moves backward by the longitudinal distance adjustment value.

5. The vehicle-mounted projection screen control method according to claim 4, characterized in that: Calculating the longitudinal distance adjustment value required after the vehicle-mounted projection screen is rotated, including: Calculating the longitudinal movement distance of the end of the vehicle-mounted projection screen after the vehicle-mounted projection screen rotates by the angle adjustment value; Obtaining the distance between the end of the vehicle-mounted projection screen and the front seat before the vehicle-mounted projection screen rotates by the angle adjustment value; In the case where the longitudinal moving distance is greater than the spacing distance, a longitudinal distance adjustment value required to eliminate the overlapping portion is calculated to obtain a longitudinal distance adjustment value required after the vehicle-mounted projection screen is rotated.

6. The vehicle-mounted projection screen control method according to claim 1, characterized in that: Calculating a sight deviation angle between at least one of the actual sight directions and the simulated direct sight direction, comprising: For each of the actual sight lines, obtaining the actual sight line landing point where the actual sight line falls on the vehicle-mounted projection screen and the reference sight line landing point where the direct sight line falls on the vehicle-mounted projection screen; Acquire the longitudinal deviation distance between the actual sight line landing point and the reference sight line landing point and the actual sight line distance between the actual sight line landing point and the eyes of the viewing passenger; A sight line deviation angle between the actual sight line direction and the direct sight line direction is calculated according to the longitudinal deviation distance and the actual sight line distance.

7. The vehicle-mounted projection screen control method according to claim 1, characterized in that: Calculating a sight deviation angle between at least one of the actual sight directions and the simulated direct sight direction, comprising: For each actual sight line direction, obtaining the actual sight line distance from the viewing passenger to the vehicle-mounted projection screen along the actual sight line direction and the reference sight line distance from the viewing passenger to the vehicle-mounted projection screen along the direct sight line direction; A sight line deviation angle between the actual sight line direction and the direct sight line direction is calculated according to the reference sight line distance and the actual sight line distance.

8. A vehicle-mounted projection screen control device, characterized in that: Application and vehicle-mounted projection device, the vehicle-mounted projection device comprising: Car projection screen; A screen support mechanism, used to provide support when the vehicle-mounted projection screen is in an unfolded state; A winding drive mechanism, used for winding or unfolding the vehicle-mounted projection screen, and controlling the screen support mechanism to rotate forward and backward, so that the vehicle-mounted projection screen rotates forward and backward to change the inclination angle of the vehicle-mounted projection screen relative to a horizontal plane or a vertical plane; The vehicle-mounted projection screen control device comprises: A detection module, used for obtaining the actual sight direction of at least one viewing passenger when the vehicle-mounted projection screen is unfolded; A control module, configured to calculate a sight line deviation angle between at least one of the actual sight line directions and a simulated direct sight line direction, calculate an angle adjustment value according to at least one of the sight line deviation angles, and generate a control signal according to the angle adjustment value; The winding drive mechanism drives the screen support mechanism to rotate the angle adjustment value in response to the control signal, so that the vehicle-mounted projection screen rotates by the angle adjustment value, and the normal vector of the rotated vehicle-mounted projection screen matches the actual line of sight direction.

9. The vehicle-mounted projection screen control device according to claim 8, characterized in that: The curtain supporting mechanism comprises: A cross bar, installed at the end of the vehicle-mounted projection screen, providing support when the vehicle-mounted projection screen is in an unfolded state, so that the vehicle-mounted projection screen remains in the unfolded state; Two first telescopic rods are respectively located at the two side edges of the side of the vehicle-mounted projection screen facing away from the projection direction, and are installed between the winding drive mechanism and the cross bar, and are telescopic when the winding drive mechanism unfolds or winds up the vehicle-mounted projection screen; Two folding rods, two ends of each folding rod are rotatably connected to two ends of the first telescopic rod respectively, and each folding rod is opened or folded when the winding drive mechanism unfolds or winds up the vehicle-mounted projection screen; The second telescopic rod has two ends respectively fixed to the folding positions of the two folding rods, and is telescopic when the two folding rods are opened or folded.

10. A vehicle, characterized in that: The vehicle comprises the vehicle-mounted projection device and the vehicle-mounted projection screen control device as described in any one of claims 8 to 9.

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