Vehicle-mounted screen and control circuit thereof

Abstract

The invention discloses a vehicle-mounted screen and a control circuit thereof, and relates to the field of vehicle-mounted supplies, a screen supporting structure is arranged in a shell used for rolling up the screen, the screen supporting structure comprises a limiting structure and a supporting structure stretching out and drawing back in the vertical direction, one end of the supporting structure is connected with the shell, and the other end of the supporting structure is connected with the limiting structure. One end of the screen supporting mechanism is connected with the free end of the screen, the other end of the screen supporting mechanism is connected with the free end of the screen and moves in the vertical direction along with movement of the free end of the screen, in the screen opening process, the free end of the screen moves downwards, and the other end of the screen supporting mechanism synchronously moves downwards in the vertical direction along with unfolding of the screen. The limiting structure is used for limiting the extension length of the supporting structure, so that the screen is kept in a flattened state, and the viewing experience of passengers is improved; and meanwhile, the shaking amplitude of the screen along with the vehicle is reduced, and the damage to the whole vehicle-mounted screen device is reduced.

Description

Technical Field

[0001] The present invention relates to the field of vehicle supplies, and particularly to a vehicle-mounted screen and its control circuit. Background Art

[0002] Modern consumers have higher and higher requirements for the driving experience, and hope to enjoy a comfortable and entertaining environment similar to that at home in the vehicle. During long-distance travel, people hope to use the time in the vehicle for entertainment and relaxation, such as watching movies, TV shows, etc. The emergence of vehicle-mounted screens provides a new solution for in-vehicle entertainment and meets the needs of consumers for diverse entertainment experiences.

[0003] After the existing screens are unfolded, they can only be in a hanging state, and the stability of the screens decreases. When passing through a road surface with poor conditions, the screens swing under the bumps of the vehicle body, which not only affects the viewing experience of passengers, but also causes damage to the screens themselves and the vehicle-mounted screen devices during the shaking of the vehicle. Therefore, there is a need for a vehicle-mounted screen that can fix the unfolded screen, reduce the swinging amplitude of the screen with the vehicle, avoid damage to the screen, and improve the viewing experience of passengers. Summary of the Invention

[0004] The purpose of the present invention is to provide a vehicle-mounted screen and its control circuit to solve the problems existing in the above-mentioned prior art, so that the free end of the screen can be fixed after unfolding, and the whole screen is in a flattened state to ensure the viewing experience of passengers.

[0005] To achieve the above purpose, the present invention provides the following solution: The present invention provides a vehicle-mounted screen, including a housing and a screen wound in the housing, and a screen support mechanism is arranged on the top surface of the housing;

[0006] The screen support mechanism includes a limiting structure and a support structure that can be telescoped in the vertical direction. One end of the support structure is connected to the housing, and the other end is connected to the free end of the screen and moves in the vertical direction along with the movement of the free end of the screen. The limiting structure is used to keep the support structure at a fixed extended length.

[0007] In one embodiment, the support structure includes a support frame, and the support frame includes at least two connecting rods. The ends of the two connecting rods are rotatably connected. The free end of one connecting rod is rotatably connected to the housing, and the free end of the other connecting rod is rotatably connected to the bottom plate. The free end of the screen is connected to the bottom plate.

[0008] In one embodiment, the limiting structure includes an electromagnetic lock. A tooth is arranged at the end of the connecting rod that is rotatably connected to the inner side wall of the housing. A locking tongue that meshes with the tooth is arranged on the electromagnetic lock. The electromagnetic lock is arranged on one side of the support frame and is used to control the telescopic length of the whole support frame through the locking tongue.

[0009] In one embodiment, a screen driving mechanism is further included. The screen mechanism is arranged on the same side of the support frame and the electromagnetic lock. The screen driving mechanism includes a motor and a reel. One end of the screen is fixedly connected to the reel, and the motor is used to drive the reel to retract and extend the screen.

[0010] In one embodiment, the screen driving mechanism also includes a bearing support and a motor support, the bearing support and the motor support are arranged on the top surface of the shell, the motor is arranged on the motor support, and the output shaft of the motor faces the bearing support, a connecting transmission shaft is provided on the output shaft of the motor, and the axis of the connecting transmission shaft coincides with the axis of the output shaft of the motor, a passive connecting shaft is provided on the bearing support, the passive connecting shaft faces the motor support, and the axis of the connecting transmission shaft coincides with the axis of the passive connecting shaft, and the two ends of the scroll are respectively sleeved on the outside of the motor, the connecting transmission shaft and the passive connecting shaft, and are fixedly connected to the inner side wall of the scroll through the passive connecting shaft and the connecting transmission shaft.

[0011] In one embodiment, a fixing surface is provided on the outer side surface of the reel, which is recessed in the axial direction of the reel. The length of the fixing surface along the axial direction of the reel is less than the length of the reel. A reel pressure strip is provided on the fixing surface for fixing the end of the screen on the reel. The reel pressure strip is embedded in the fixing surface, and the curvature of the side of the reel pressure strip facing away from the fixing surface is the same as the curvature of the reel.

[0012] In one embodiment, the end of the connecting transmission shaft away from the motor and the end of the passive connecting shaft away from the bearing support are both provided with a transmission plane, and the inner side wall of the reel is provided with a protruding step surface, and the transmission plane abuts against the step surface.

[0013] In one embodiment, a first through hole is provided on the transmission plane, a second through hole is provided on the outer side of the reel at a position corresponding to the step surface, the second through hole passes through the reel, and the axes of the first through hole and the second through hole coincide with each other, and fixing pins are provided in the first through hole and the second through hole.

[0014] In one embodiment, a stretch fixing strip is provided at the free end of the screen, and the screen is fixedly connected to the bottom plate via the stretch fixing strip.

[0015] In one embodiment, a pressure-sensitive sensor is provided on the opposite side of the base plate where the connecting rod is connected. The pressure-sensitive sensor is strip-shaped and is arranged along the length direction of the base plate. At least two groups of pressure-sensitive sensors are arranged along the width direction of the base plate. The pressure-sensitive sensor is electrically connected to the motor and the electromagnetic lock.

[0016] To achieve the above object, the present invention further provides a control circuit for a vehicle-mounted screen, the control circuit being applied to the above-mentioned vehicle-mounted screen, the control circuit comprising: a motor drive circuit, an electromagnetic lock control circuit, a pressure-sensitive sensor circuit, and a single-chip microcomputer;

[0017] The motor drive circuit is used to drive the motor to work; the electromagnetic lock control circuit is used to control the opening and closing of the electromagnetic lock; the varistor sensor circuit is used to detect the pressure generated on the bottom plate;

[0018] The single-chip microcomputer is respectively connected to the motor drive circuit, the electromagnetic lock control circuit and the varistor sensor circuit, and is used to control the motor drive circuit, the electromagnetic lock control circuit and the varistor sensor circuit.

[0019] The present invention has achieved the following technical effects compared with the prior art:

[0020] A screen support structure is provided in the housing for winding the screen. The screen support mechanism includes a limiting structure and a support structure that expands and contracts in the vertical direction. One end of the support structure is connected to the housing. After the screen is opened, the free end of the screen moves downward, and the other end of the screen support mechanism moves downward synchronously in the vertical direction as the screen unfolds. After the screen is unfolded to an appropriate size, the limiting structure is used to limit the elongation length of the support structure, so that the screen remains flat, improving the viewing experience of passengers; at the same time, the shaking amplitude of the screen with the vehicle is reduced, and the overall damage to the vehicle-mounted screen is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the overall structure of the vehicle-mounted screen in the embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the housing structure in the vehicle-mounted screen in the embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the reel without the screen in the vehicle-mounted screen in the embodiment of the present invention inside the housing;

[0025] Figure 4 It is a schematic diagram of the structure of the driving device of the reel in the vehicle-mounted screen in the embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of the overall structure of the screen driving mechanism in the vehicle-mounted screen in the embodiment of the present invention;

[0027] Figure 6 It is a top view schematic diagram of the screen driving mechanism in the vehicle-mounted screen in the embodiment of the present invention;

[0028] Figure 7 Schematic cross-sectional structure diagram of the screen driving mechanism in the in-vehicle screen along the A-A direction in the top view state in the embodiment of the present invention;

[0029] Figure 8 Overall structure diagram of the screen support mechanism in the in-vehicle screen in the embodiment of the present invention;

[0030] Figure 9 End structure diagram of the connecting rod of the screen support mechanism in the in-vehicle screen connected to the housing in the embodiment of the present invention;

[0031] Figure 10 Structure diagram of the electromagnetic lock of the screen support mechanism in the in-vehicle screen in the embodiment of the present invention;

[0032] Figure 11 Structure diagram of three groups of pressure-sensitive sensors arranged on the bottom plate in the in-vehicle screen in the embodiment of the present invention;

[0033] Figure 12 Structure diagram of the passive connecting shaft in the in-vehicle screen in the embodiment of the present invention;

[0034] Figure 13 Structure diagram of the reel in the in-vehicle screen in the embodiment of the present invention;

[0035] Figure 14 Enlarged schematic diagram of the structure at position A of the reel in the in-vehicle screen in the embodiment of the present invention;

[0036] Figure 15 Structure block diagram of the control circuit in the embodiment of the present invention;

[0037] Figure 16 Schematic diagram of the motor drive circuit in the embodiment of the present invention;

[0038] Figure 17 Schematic diagram of the electromagnetic lock control circuit in the embodiment of the present invention;

[0039] Figure 18 Schematic diagram of the pressure-sensitive sensor circuit in the embodiment of the present invention;

[0040] Figure 19 Schematic circuit diagram of the single-chip microcomputer in the embodiment of the present invention

[0041] Figure 20 Schematic diagram of the key circuit in the embodiment of the present invention;

[0042] Figure 21 Schematic diagram of the infrared sensor circuit in the embodiment of the present invention;

[0043] Figure 22 Schematic diagram of the power supply circuit in the embodiment of the present invention.

[0044] Among them, 1. housing; 2. connecting rod; 3. reel; 4. bottom plate; 5. stretching fixing strip; 6. pressure-sensitive sensor; 7. electromagnetic lock; 8. motor support; 9. bearing support; 10. reel pressing strip; 11. motor; 12. coupling; 13. O-ring; 14. connecting transmission shaft; 15. transmission plane; 16. fixing surface; 17. fixing pin; 18. passive connecting shaft; 19. support seat; 20. teeth; 21. lock tongue; 22. rotating shaft seat; 23. keyway; 24. flat key; 25. stepped surface. Specific embodiments

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] The purpose of the present invention is to provide a vehicle-mounted screen and its control circuit to solve the problems existing in the prior art, enable the screen to remain relatively stable with the vehicle, improve the viewing experience of passengers, and at the same time reduce the damage to the vehicle-mounted screen caused by vehicle shaking.

[0047] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] Please refer to Figure 1 , in this embodiment, the vehicle-mounted screen includes a housing 1, the screen is wound inside the housing 1, a screen support mechanism is provided on the top surface of the housing 1, the screen support mechanism includes a limiting structure and a support structure, wherein the support structure can expand and contract in the vertical direction to change its length, and one end of the support structure is connected to the top surface of the housing 1; during use, the free end of the screen moves downward from the housing 1, dragging the screen wound in the housing 1 to unfold. During the unfolding process of the screen, the other end of the support structure moves downward in the vertical direction as the screen unfolds until the screen unfolds to an appropriate size. At this time, the limiting structure locks the support structure to limit the elongation length of the support structure, and the support structure supports the unfolded screen to prevent the screen from shaking with the vehicle. At the same time, the elongation length of the support structure is equal to the unfolding length of the screen, and the support structure ensures that the screen is in a flat state, improving the viewing experience of passengers.

[0049] Please refer to Figure 1 , Figure 8 and Figure 9The supporting structure may be a support frame, which includes at least two connecting rods 2, the ends of the two connecting rods 2 being rotatably connected, the free end of one of the connecting rods 2 being rotatably connected to the shell 1, and the connection position between the free end of the connecting rod 2 and the shell 1 being located on the inner side wall of the shell 1. In order to improve the stability of the connection between the connecting rod 2 and the shell 1, a support seat 19 is provided on the top surface of the shell 1, and the connecting rod 2 is rotatably connected to the shell 1 through the support seat 19. The free end of the other connecting rod 2 is rotatably connected to the bottom plate 4. In order to ensure that the screen remains flat during the unfolding process, the free end of the screen is connected to the bottom plate 4, and the horizontal support of the screen is achieved through the bottom plate 4.

[0050] Preferably, a rotating shaft seat 22 is provided on the base plate 4 , and the end of the connecting rod 2 rotatably connected to the base plate 4 is rotatably connected to the rotating shaft seat 22 .

[0051] The number of support structures is set according to actual needs. Preferably, two support structures are provided, and the free ends of the two support structures are respectively arranged at the two ends of the scroll 3. The two support structures simultaneously support the two ends of the base plate 4 to prevent the screen from tilting during the unfolding process, thereby further improving the stability of the screen after unfolding; the support mechanism includes but is not limited to a support frame, and can also be an electric telescopic rod, a cylinder, or the like that has a mechanism that can limit its arbitrary telescopic length during the telescopic process.

[0052] Please refer to Figure 9 and Figure 10 When the supporting structure is a support frame, the limiting mechanism is an electromagnetic lock 7. When the support frame is extended or retracted, the angle between the connecting rod 2 rotatably connected to the shell 1 and the shell 1 is an acute angle. As the acute angle changes, the telescopic length of the support frame changes accordingly. The electromagnetic lock 7 is arranged on the side where the angle between the connecting rod 2 and the shell 1 is an obtuse angle. The end of the connecting rod 2 that is rotatably connected to the inner side wall of the shell 1 is provided with teeth 20. The electromagnetic lock 7 is provided with a lock tongue 21 that meshes with the teeth 20 on the side facing the connecting rod 2. The electromagnetic lock 7 is arranged on one side of the support frame. The lock tongue 21 of the electromagnetic lock 7 is engaged with the teeth 20. The teeth 20 at the end of the connecting rod 2 mesh with each other. When the support frame extends with the screen, the lock tongue 21 of the electromagnetic lock 7 retracts, and the connecting rod 2, which is rotatably connected to the housing 1, rotates smoothly. When the screen stops unfolding, the support frame stops extending, and the lock tongue 21 of the electromagnetic lock 7 pops out and meshes with the teeth 20 at the end of the connecting rod 2. The lock tongue 21 restricts the rotation of the connecting rod 2, thereby controlling the overall extension length of the supporting frame to remain unchanged, keeping the screen in a flat state, and preventing the screen from swinging with the shaking of the vehicle, ensuring the passengers' viewing experience, thereby reducing damage to the screen caused by the shaking of the vehicle;

[0053] In a preferred technical solution, five teeth 20 are provided at the end of the connecting rod 2 rotatably connected to the housing 1, and four meshing intervals are formed at the end of the connecting rod 2. When the screen is unfolded by 1 / 4, 2 / 4, 3 / 4, and 4 / 4, the locking tongue 21 of the electromagnetic lock 7 pops out and snaps into the meshing intervals. By controlling the rotation angle of the connecting rod 2, the overall elongation length of the support frame is controlled, so that the support frame can still keep the screen in a flattened state when the screen is unfolded by different lengths, and at the same time, the shaking of the screen is reduced.

[0054] Please refer to Figure 1 and Figure 5 , the vehicle-mounted screen further includes a screen driving mechanism, and the screen driving mechanism is arranged on the same side as the support frame and the electromagnetic lock 7 to prevent the support frame from interfering with the normal retraction and deployment of the screen. The screen driving mechanism includes a motor 11 and a reel 3. The motor 11 and the reel 3 are arranged inside the housing 1. One end of the screen is fixed on the reel 3 to ensure that the screen can be smoothly wound on the reel 3. The motor 11 is used to drive the rotation of the reel 3, and the retraction and deployment of the screen by the reel 3 are realized by changing the rotation direction of the motor 11.

[0055] Since traditional vehicle-mounted screens are generally LCD screens or LED screens, when they are stored after use, the structure for storing the screen will occupy a large space inside the vehicle compartment, and may even block the sunroof or sky curtain of the vehicle, which brings great limitations to the vehicle interior and structural design. In this technical solution, the traditional LCD screen or LED screen is replaced by a screen. After storage, the screen is wound on the reel 3, and at the same time, the support frame for supporting the screen flat is folded, further reducing the occupied space of the screen after storage; through tests, the vehicle-mounted screen in this solution can reduce the occupied space by 85% after storage.

[0056] To ensure the smooth retraction and deployment of the screen, the screen driving mechanism further includes a bearing support 9 and a motor 11 support 8. The bearing support 9 and the motor 11 support 8 are also arranged on the top surface of the housing 1. The motor 11 is arranged on the motor 11 support 8, the output shaft of the motor 11 faces the bearing support 9, a connecting transmission shaft 14 is arranged on the output shaft of the motor 11, and the axis of the connecting transmission shaft 14 coincides with the axis of the output shaft of the motor 11. A passive connecting shaft 18 is arranged on the bearing support 9, the passive connecting shaft 18 faces the motor 11 support 8, and the axis of the passive connecting shaft 18 coincides with the axis of the connecting transmission shaft 14;

[0057] Preferably, manufacturing errors and installation errors inevitably exist during the manufacturing and installation of each structure. Therefore, a coupling 12 is provided between the output shaft of the motor 11 and the connecting transmission shaft 14 to correct the concentricity between the output shaft of the motor 11 and the connecting transmission shaft 14, so that the output torque of the motor 11 can be smoothly transmitted to the connecting transmission shaft 14 and the reel 3. Among them, the diameters of the motor 11, the connecting transmission shaft 14, and the passive connecting shaft 18 are smaller than the inner diameter of the reel 3. Both ends of the reel 3 are respectively sleeved outside the motor 11, the connecting transmission shaft 14, and the passive connecting shaft 18. The passive connecting shaft 18 and the connecting transmission shaft 14 are fixedly connected to the inner side wall of the reel 3 to ensure that the reel 3, the motor 11, the connecting transmission shaft 14, and the passive connecting shaft 18 rotate synchronously. An annular groove for placing the O-ring 13 is also provided on the outer side surface of the connecting transmission shaft 14. The O-ring 13 is sleeved on the outer side surface of the connecting transmission shaft 14 through the annular groove to buffer the extrusion force between the inner side wall of the reel 3 and the connecting transmission shaft 14, avoid collision between the reel 3 and the connecting transmission shaft 14 during operation, and reduce the noise during the process of the reel 3 winding and unwinding the screen.

[0058] Please refer to Figure 5 , to ensure the stable connection between the end of the screen and the reel 3, a fixing surface 16 recessed in the axial direction of the reel 3 is provided on the outer side surface of the reel 3. The length of the fixing surface 16 along the axial direction of the reel 3 is smaller than the length of the reel 3, and a reel 3 pressing strip is provided on the fixing surface 16. After flattening one end of the screen, it is placed on the fixing surface 16. The reel 3 pressing strip is embedded in the fixing surface 16, and the end of the screen is fixed on the reel 3 by the extrusion between the reel 3 pressing strip and the fixing surface 16. And in order to prevent the side of the reel 3 pressing strip away from the fixing surface 16 from damaging the screen, the side of the reel 3 pressing strip away from the fixing surface 16 is set as an arc surface with the same radian as the reel 3;

[0059] Preferably, multiple through holes are provided at the end of the screen, multiple fixing holes are provided on the reel pressing strip 10, and multiple threaded holes are provided on the fixing surface 16. The number of through holes at the end of the screen, the number of fixing holes on the reel pressing strip 10, and the number of threaded holes on the fixing surface 16 are the same and are arranged in one-to-one correspondence. The end of the screen is placed on the fixing surface 16, and the through holes at the end of the screen are aligned with the threaded holes on the fixing surface 16. The reel pressing strip 10 is embedded in the fixing surface 16 to press the screen tightly, and then bolts are used to pass through the fixing holes and screw into the threaded holes provided on the fixing surface 16 to further improve the connection stability between the screen and the reel 3 and between the reel pressing strip 10 and the reel 3.

[0060] Please refer to Figures 4 to 7 and Figures 12 to 14, to improve the transmission efficiency between the connecting transmission shaft 14, the passive connecting shaft 18 and the reel 3, a transmission plane 15 is provided at the end of the connecting transmission shaft 14 away from the motor 11, and a transmission plane 15 is also provided at the end of the passive connecting shaft 18 away from the bearing support 9. Moreover, a protruding stepped surface 25 is provided on the inner side wall of the reel 3. After sleeving the reel 3 outside the connecting transmission shaft 14 and the passive connecting shaft 18, the transmission plane 15 abuts against the stepped surface 25, and torque is transmitted through the cooperation between the transmission plane 15 and the stepped surface 25;

[0061] A keyway 23 is also provided on the transmission plane 15, and a flat key 24 matching the shape and size of the keyway 23 is provided on the stepped surface 25. During the assembly process of the reel 3, the connecting transmission shaft 14 and the passive connecting shaft 18, the flat key 24 is inserted into the corresponding keyway 23, and torque is transmitted through the cooperation between the flat key 24 and the keyway 23; As one of the embodiments, please refer to Figure 4 , Figure 7 and Figure 12 and Figure 14 , keyways 23 are also provided on the side symmetrical to the side where the transmission planes 15 are provided on the connecting transmission shaft 14 and the passive connecting shaft 18, and are symmetrical to the keyways 23 provided on the transmission planes 15. Two symmetrical flat keys 24 are also provided on the side of the inside of the reel 3 opposite to the stepped surface 25 and opposite to the flat keys 24 symmetrical to the stepped surface 25, for cooperating with the keyways 23 provided on the connecting transmission shaft 14 and the passive connecting shaft 18;

[0062] Since both the transmission connecting shaft and the passive connecting shaft 18 are arranged inside the reel 3, the long-term abutting cooperation is likely to cause wear of the transmission plane 15 and the stepped surface 25, reducing the later transmission effect. Therefore, to ensure the stable torque transmission between the transmission connecting shaft 14, the passive connecting shaft 18 and the reel 3, a first through hole is provided on the transmission plane 15, and a second through hole is provided at the position on the outer side surface of the reel 3 corresponding to the stepped surface 25. The second through hole penetrates the reel 3. In this embodiment, the first through hole is provided at the bottom of the keyway 23, and the second through hole passes through the flat key 24. After sleeving the reel 3 outside the transmission connecting shaft 14 and the passive connecting shaft 18, after the transmission plane 15 abuts against the stepped surface 25, ensure that the axes of the first through hole and the second through hole coincide, and a fixing pin 17 is provided in the first through hole and the second through hole, and torque is transmitted through the fixing pin 17 between the reel 3 and the connecting transmission shaft 14 and between the reel 3 and the passive transmission shaft; Preferably, a counterbore is provided at the position on the outer side surface of the reel 3 corresponding to the second through hole. After inserting the fixing pin 17 into the first through hole and the second through hole, the end of the fixing pin 17 is hidden in the counterbore to prevent the end of the fixing pin 17 from damaging the screen;

[0063] Since the entire screen is flexible, during the process of unfolding the screen, the free end of the screen will have a curved surface distributed in the vertical direction under uneven force, which affects the viewing experience of passengers. Therefore, a stretching and fixing strip 5 is provided at the free end of the screen. The stretching and fixing strip 5 includes two fixing strips, which are respectively arranged on the front and back of the screen, sandwich the free end of the screen between the two fixing strips, and fix the stretching and fixing strip 5 composed of the two fixing strips on the bottom plate 4. During the process of the bottom plate 4 dragging the free end of the screen to unfold, the force on the free end of the screen is ensured to be uniform, and the appearance of a curved surface at the free end of the screen is avoided.

[0064] Please refer to Figure 1 and 11 , because the space inside the vehicle is relatively narrow, especially after placing items in the vehicle, the height inside the vehicle decreases, and the stacked items form an obstacle under the in-vehicle screen. To prevent the free end of the screen from being unable to continue descending under the obstruction of the obstacle during the unfolding process of the screen, which may cause wrinkles on the screen, in order to be able to adjust the unfolding size of the screen in real time, a pressure-sensitive sensor 6 is provided on the opposite side where the bottom plate 4 is connected to the connecting rod 2. The pressure-sensitive sensor 6 is strip-shaped, and the strip-shaped pressure-sensitive sensor 6 is arranged along the length direction of the bottom plate 4, and at least two groups are arranged along the width direction of the bottom plate 4. The two groups of pressure-sensitive sensors 6 are respectively arranged at the edge positions of the bottom plate 4. After the bottom plate 4 touches an obstacle, the bottom plate 4 tilts, and the obstacle slides on the bottom plate 4 until the obstacle touches the pressure-sensitive sensor 6. After the pressure-sensitive sensor 6 detects the pressure generated on the bottom plate 4, the pressure-sensitive sensor 6 controls the motor 11 to reverse and retract the screen until no pressure signal is generated on the pressure-sensitive sensor 6, and the motor 11 controls the reel 3 to stop retracting the screen. At this time, the electromagnetic lock 7 is energized, and the locking tongue 21 pops out and meshes with the tooth 20 at the end of the connecting rod 2. If the tooth 20 at the end of the connecting rod 2 cannot mesh with the locking tongue 21, the motor 11 continues to control the reel 3 to retract the screen and raise the bottom plate 4 above the obstacle until the locking tongue 21 meshes with the tooth 20 at the end of the connecting rod 2. The electromagnetic lock 7 locks the extended length of the support frame to keep the screen in a flattened state and reduce the damage to the screen caused by vehicle shaking;

[0065] Preferably, to improve the detection range and sensitivity of the pressure-sensitive sensor 6, on the basis of the above technical solution, a third group of pressure-sensitive sensors 6 is arranged at the middle position of the bottom plate 4 to expand the detection range of the pressure-sensitive sensor 6. No matter which position on the bottom plate 4 comes into contact with an obstacle, a signal can be quickly transmitted to the motor 11 to prevent the screen from continuing to unfold.

[0066] Adaptations made according to actual needs are within the protection scope of the present invention.

[0067] In another embodiment, the present invention also provides a control circuit for an in-vehicle screen. As Figure 15As shown in the figure, the control circuit includes: a motor drive circuit, an electromagnetic lock control circuit, a pressure-sensitive sensor circuit, and a single-chip microcomputer. The motor drive circuit is used to drive the motor to work; the electromagnetic lock control circuit is used to control the opening and closing of the electromagnetic lock; the pressure-sensitive sensor circuit is used to detect the pressure generated on the bottom plate; the single-chip microcomputer is connected to the motor drive circuit, the electromagnetic lock control circuit, and the pressure-sensitive sensor circuit respectively, and is used to control the motor drive circuit, the electromagnetic lock control circuit, and the pressure-sensitive sensor circuit.

[0068] The current bracket selects a DC motor with a Hall sensor, and the motor drive circuit is as Figure 16 shown. The functions of the motor drive circuit are as follows:

[0069] Function 1: Speed control and forward / reverse rotation. U5 is an H-bridge drive chip that can control the voltage of OUT1 and OUT2 output to the positive and negative poles of the motor. M_C1 / 2 is connected to the single-chip microcomputer IO port through a current-limiting resistor. When M_C1 / 2 outputs a high / low level, OUT1 / 2 outputs 12V / 0V. If you need to control the motor to rotate forward, M_C1 outputs a high level and M_C2 outputs a low level. There will be a positive 12V voltage difference between OUT1 and OUT2, and the motor rotates forward. For reverse rotation, set M_C1 to low level and M_C2 to high level. For speed control, pull one of them low, and control the speed of the other through the duty cycle of PWM. In addition, if both inputs are high level, the motor brakes. If both are low level, the chip enters the low-power mode.

[0070] Function 2: Motion feedback. The feedback terminal of the Hall sensor of the motor is connected to the single-chip microcomputer IO port through a current-limiting resistor. By detecting the sequence of the signal waveforms of S1 and S2 ports and the number of rising edges, the forward / reverse rotation of the motor, its number of motion cycles per unit time (speed), and the total number of motion cycles (bracket position) can be identified.

[0071] The electromagnetic lock control circuit is as Figure 17 shown. The single-chip microcomputer outputs a high level through LOCK_CTR1, and R25 enhances the driving ability of this high level. Then turn on Q1, so that LOCK1 outputs 12V, making the electromagnetic lock energized, and the lock tongue retracts to release the lock. When the output is low, the electromagnetic lock will restore its original state to lock the bracket. However, since the electromagnetic lock is an inductive load, a reverse electromotive force will be released when the power is turned off. Here, a diode D2 is connected in reverse to release the energy to the 12V power supply to prevent the MOS transistor Q1 from being damaged.

[0072] The pressure-sensitive sensor is actually a varistor. When the pressure on the surface of the sensor changes, the resistance value changes. As Figure 18As shown, there are three piezoresistive sensor interfaces, P1 is used, and the rest are reserved. Here, R14, R15, and R16 are used as voltage-dividing resistors. The piezoresistive sensors are under different pressures, resulting in different resistances. The real-time pressure is input to the ADC of the single-chip microcomputer through a current-limiting resistor. Once under pressure, the single-chip microcomputer will respond immediately.

[0073] The minimum system of the single-chip microcomputer is the minimum unit that enables the single-chip microcomputer to work. As Figure 19 shown, the single-chip microcomputer includes: ① It is powered by 3.3v, provided by the power supply circuit. C6 and C7 are power supply filtering capacitors. ② The power-on reset circuit, composed of R4 and C9. ③ There is no external crystal oscillator, and the internal RC oscillator is used as the clock source. ④ The download circuit, H1 provides an external download interface and the debugging serial port USART1.

[0074] After the single-chip microcomputer can work effectively, it becomes the brain of the entire system. All signals will be input to the single-chip microcomputer, and then the single-chip microcomputer will process them uniformly according to the program. Such as motion control, button control, speed, position, pressure sensing, etc.

[0075] As Figure 15 shown, the control circuit further includes: a button circuit, connected to the single-chip microcomputer, for controlling the screen to rise, fall, stop urgently, or return to the origin.

[0076] As Figure 20 shown, SW1~4 are on-board buttons for debugging. KEY1 is a button interface, and buttons with different appearance shapes can be selected to be connected to replace the function of the on-board buttons. Each button is connected to the single-chip microcomputer through a current-limiting resistor. Usually, the single-chip microcomputer defaults to output a high level. If the button is pressed, the corresponding IO port level will be pulled low.

[0077] As Figure 15 shown, the control circuit further includes: an infrared sensor circuit, connected to the single-chip microcomputer, for detecting whether the screen has returned to the origin. Figure 21 This is a schematic diagram of the infrared sensor circuit.

[0078] If the bracket needs to achieve position control of the screen at the millimeter level in terms of function, then at least the position of the origin needs to be known, and then operations and controls are carried out. In the present invention, an infrared pair tube is selected. When the screen returns to the origin, the infrared pair tube's transmitted light will be blocked. The infrared sensor gives a high-level signal to the single-chip microcomputer through the current-limiting resistor R24. In this way, the bracket knows that the device has been reset. In addition, R23 is the current-limiting resistor for the power supply of the receiving tube, and R22 is the current-limiting resistor for the transmitting tube.

[0079] As Figure 15As shown in the figure, the control circuit further includes: a power supply circuit, which is respectively connected to the motor drive circuit, the electromagnetic lock control circuit, the varistor sensor circuit, the single-chip microcomputer, the button circuit and the infrared sensor circuit, and is used to supply power to the motor drive circuit, the electromagnetic lock control circuit, the varistor sensor circuit, the single-chip microcomputer, the button circuit and the infrared sensor circuit.

[0080] As Figure 22 shown in the figure, the 12V power supply is input through DC1. U3 is a bidirectional TVS tube with 26V (the possible peak voltage fluctuation of the in-vehicle 12V power supply), which is mainly used for bidirectional electrostatic protection. D1 is an anti-reverse diode to prevent the power supply from being reversely connected and burning out the circuit. Finally, after being stabilized, filtered by capacitors, it is input to the stepper motor, the electric door lock, the infrared pair tube and the DCDC for power use. The DCDC further chops the 12V through the internal MOS tube, continues the current through L1, stabilizes the wave through C3 and C4, and then outputs 3.3V for use by the unit machine, the button circuit, the varistor sensor circuit, etc.

[0081] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed invention.

[0082] In the present invention, specific examples are used to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A vehicle-mounted screen, characterized in that, It includes a housing and a screen wound inside the housing, and a screen support mechanism is provided on the top surface of the housing; The screen support mechanism includes a limiting structure and a support structure that telescopically moves in the vertical direction. One end of the support structure is connected to the housing, and the other end is connected to the free end of the screen and moves in the vertical direction as the free end of the screen moves. The limiting structure is used for the support structure to maintain a fixed extended length.

2. The in-vehicle screen according to claim 1, characterized in that, The support structure includes a support frame, and the support frame includes at least two connecting rods. The ends of the two connecting rods are rotatably connected. The free end of one of the connecting rods is rotatably connected to the housing, and the free end of the other connecting rod is rotatably connected to a bottom plate. The free end of the screen is connected to the bottom plate.

3. The in-vehicle screen according to claim 2, wherein The limiting structure includes an electromagnetic lock. Teeth are provided at the end of the connecting rod that is rotatably connected to the inner side wall of the housing. A locking tongue that meshes with the teeth is provided on the electromagnetic lock. The electromagnetic lock is provided on one side of the support frame and is used to control the telescopic length of the entire support frame through the locking tongue.

4. The in-vehicle screen according to claim 3, wherein It further includes a screen driving mechanism. The screen mechanism is provided on the same side as the support frame and the electromagnetic lock. The screen driving mechanism includes a motor and a reel. One end of the screen is fixedly connected to the reel, and the motor is used to drive the reel to wind and unwind the screen.

5. The vehicle-mounted screen according to claim 4, characterized in that, The screen driving mechanism further includes a bearing support and a motor support. The bearing support and the motor support are provided on the top surface of the housing. The motor is provided on the motor support, and the output shaft of the motor faces the bearing support. A connecting transmission shaft is provided on the output shaft of the motor. The axis of the connecting transmission shaft coincides with the axis of the output shaft of the motor. A passive connecting shaft is provided on the bearing support, and the passive connecting shaft faces the motor support. The axis of the connecting transmission shaft coincides with the axis of the passive connecting shaft. Both ends of the reel are respectively sleeved outside the motor, the connecting transmission shaft, and the passive connecting shaft, and are fixedly connected to the inner side wall of the reel through the passive connecting shaft and the connecting transmission shaft.

6. The vehicle-mounted screen according to claim 4, wherein, A fixing surface that recesses towards the axis of the reel is provided on the outer side surface of the reel. The length of the fixing surface along the axial direction of the reel is less than the length of the reel. A reel pressing strip for fixing the end of the screen on the reel is provided on the fixing surface. The reel pressing strip is embedded in the fixing surface, and the arc of the side of the reel pressing strip facing away from the fixing surface is the same as the arc of the reel.

7. The vehicle-mounted screen according to claim 5, wherein, A transmission plane is provided at the end of the connecting transmission shaft far from the motor and at the end of the passive connecting shaft far from the bearing support. A protruding step surface is provided on the inner side wall of the reel, and the transmission plane abuts against the step surface.

8. The in-vehicle screen according to claim 7, wherein A first through hole is provided on the transmission plane, and a second through hole is provided at a position corresponding to the step surface on the outer side of the reel. The second through hole penetrates the reel, and the axis of the first through hole coincides with the axis of the second through hole. A fixing pin is provided in the first through hole and the second through hole.

9. The vehicle-mounted screen according to claim 4, wherein A stretching and fixing strip is provided at the free end of the screen, and the screen is fixedly connected to the bottom plate through the stretching and fixing strip.

10. The in-vehicle screen according to claim 9, characterized in that, A pressure-sensitive sensor is provided on the opposite side of the bottom plate connected to the connecting rod. The pressure-sensitive sensor is strip-shaped and arranged along the length direction of the bottom plate. At least two groups of the pressure-sensitive sensors are arranged along the width direction of the bottom plate, and the pressure-sensitive sensor is electrically connected to the motor and the electromagnetic lock.

11. A control circuit for an in-vehicle screen, characterized in that, The control circuit is applied to the vehicle-mounted screen according to any one of claims 1-10. The control circuit includes: a motor drive circuit, an electromagnetic lock control circuit, a pressure-sensitive sensor circuit, and a single-chip microcomputer. The motor drive circuit is used to drive the motor to work; the electromagnetic lock control circuit is used to control the opening and closing of the electromagnetic lock; the pressure-sensitive sensor circuit is used to detect the pressure generated on the bottom plate. The single-chip microcomputer is respectively connected to the motor drive circuit, the electromagnetic lock control circuit, and the pressure-sensitive sensor circuit, and is used to control the motor drive circuit, the electromagnetic lock control circuit, and the pressure-sensitive sensor circuit.

12. The control circuit of the in-vehicle screen according to claim 11, characterized in that, The control circuit further includes: A key circuit, connected to the single-chip microcomputer, and used to control the screen to rise, fall, stop urgently, or return to the origin.

13. The control circuit of the in-vehicle screen according to claim 12, characterized in that, The control circuit further includes: An infrared sensor circuit, connected to the single-chip microcomputer, and used to detect whether the screen returns to the origin.

14. The control circuit of the in-vehicle screen according to claim 13, characterized in that, The control circuit further includes: A power supply circuit, respectively connected to the motor drive circuit, the electromagnetic lock control circuit, the pressure-sensitive sensor circuit, the single-chip microcomputer, the key circuit, and the infrared sensor circuit, and is used to supply power to the motor drive circuit, the electromagnetic lock control circuit, the pressure-sensitive sensor circuit, the single-chip microcomputer, the key circuit, and the infrared sensor circuit.

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