Rear projection screen, seat and vehicle

Abstract

The invention provides a rear projection screen, a seat and a vehicle. The rear projection screen, the seat and the vehicle can be applied to the field of intelligent cabins. A rear projection screen is installed on the seat, the seat comprises a heat dissipation device, the heat dissipation device comprises an air inlet, a fan and an air outlet, the air inlet, the fan and the air outlet are arranged from bottom to top, and the rear projection screen is located on an air outlet path of the fan. The back projection screen can be applied to an intelligent automobile or an electric automobile, the heat dissipation efficiency of the back projection screen can be improved, and therefore the situation that the temperature in the seat backrest rises too fast can be avoided.

Description

Rear projection screens, seats and vehicles Technical Field

[0001] The present application relates to the field of smart cockpits, and more specifically, to a rear projection screen, a seat, and a vehicle. Background Art

[0002] With the development of in-cabin usage scenarios, vehicles are becoming more than just a means of transportation. They are now also being used for family interactions, in-car office work, and on-the-go entertainment. In-car entertainment has evolved from the audio, image, and multimedia eras to an immersive experience. In-car displays have become a necessity, and large screens in particular are becoming the preferred entertainment device of choice. However, solving the heat dissipation issue for large-screen in-car displays has become a pressing issue.

[0003] Summary of the Invention

[0004] The present application provides a rear projection screen, a seat and a vehicle, which help to improve the heat dissipation efficiency of the rear projection screen, thereby preventing the temperature inside the seat back from rising too quickly.

[0005] In a first aspect, the present application provides a chair having a rear projection screen installed thereon, the chair including a heat dissipation device, the heat dissipation device including an air inlet, a fan and an air outlet, the air inlet, the fan and the air outlet being arranged from bottom to top, wherein the rear projection screen is located on the air outlet path of the fan.

[0006] Based on this technical solution, placing the air inlet at the bottom allows unheated air to enter the seat back. The fan-blown air heats up after passing through the rear projection screen. Because the heated air rises, it can be discharged out of the seat through the air outlet. This helps improve the rear projection screen's heat dissipation efficiency and prevents the seat back from heating up too quickly.

[0007] In some possible implementations, the rear projection screen can also be called a light field screen. The rear projection screen can break through the limitations of the physical space in the vehicle cabin and achieve long-distance imaging at a certain distance (for example, 3 meters), thereby reducing visual fatigue. At the same time, based on the design of the spatial optical system, a large-size (for example, 40 inches) picture can be achieved. In combination with the first aspect, in certain implementations of the first aspect, the seat includes a seat cover, and a plurality of ventilation holes are provided on the seat cover, and the arrangement position of at least some of the plurality of ventilation holes corresponds to the arrangement position of the air outlet.

[0008] Based on the above technical solution, by reusing the ventilation holes on the seat cover, the air from the air outlet can be discharged outside the seat through the ventilation holes. This eliminates the need to open additional holes in the seat cover, helping to reduce the production and design costs of the seat.

[0009] In some possible implementations, the size of the air outlet is larger than the size of the ventilation hole (for example, the area of ​​the air outlet is larger than the area of ​​the ventilation hole).

[0010] In some possible implementations, the projection area of ​​at least part of the ventilation hole on a preset plane (eg, the ground) is located within the projection area of ​​the air outlet on the preset plane.

[0011] In combination with the first aspect, in certain implementations of the first aspect, the heat dissipation device also includes a backrest ventilation bag, one end of the backrest ventilation bag is connected to the fan and the other end of the backrest ventilation bag is provided with an air outlet, and the rear projection screen is located on the air outlet path of the air outlet of the backrest ventilation bag.

[0012] Based on the above technical solution, the air blown out of the fan outlet can first pass through the backrest ventilation bag, and then blow out the air outlet of the backrest ventilation bag to the rear projection screen. In this way, the backrest ventilation bag can achieve wind concentration, which helps to improve the heat dissipation efficiency of the rear projection screen.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the air outlet is located in a top area of ​​a seat back in the seat.

[0014] Based on the above technical solution, since the seat cover with ventilation holes is generally located in the top area of ​​the seat back, by placing the air outlet of the heat dissipation device in the top area of ​​the seat back, the ventilation holes on the seat cover can be reused. This eliminates the need for additional holes in the seat cover, helping to reduce seat production and design costs.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the seat includes a seat back panel having a recessed portion, and the air inlet is disposed in the recessed portion.

[0016] Based on the above technical solution, the air inlet can be set in the recessed part of the seat backboard, which will not affect the appearance of the seat. In addition, since the user's knee space is far away from the human body, it is not easy for the user to notice the air intake.

[0017] In some possible implementations, the height of the air inlet from the cabin floor is [200 mm, 500 mm]. In a second aspect, the present application provides a seat, the seat comprising a backrest frame, the backrest frame comprising an upper crossbeam, the upper crossbeam comprising a mounting hole, so that a rear projection screen is fixedly connected to the upper crossbeam through the mounting hole.

[0018] Based on the above technical solution, by setting a mounting hole on the upper crossbeam of the seat frame, the rear projection screen can be fixed to the upper crossbeam through the mounting hole, thereby realizing the installation of the rear projection screen on the seat.

[0019] In some possible implementations, the rear projection screen includes mounting holes, and the mounting holes on the upper beam and the mounting holes on the rear projection screen are fixed by connecting members (eg, bolts), thereby fixing the rear projection screen on the upper beam.

[0020] In combination with the second aspect, in some implementations of the second aspect, the upper beam includes a positioning pin, and the positioning pin is used to position the rear projection screen.

[0021] Based on the above technical solution, by providing positioning pins on the upper crossbeam of the seat frame, it is convenient for the installer to install the rear projection screen on the seat frame.

[0022] In a third aspect, the present application provides a headrest, which is located in a seat, on which a rear projection screen is installed, and a ring-shaped bracket is provided on the first side of the headrest, and the rear projection screen is located inside the ring-shaped bracket; wherein the first side is the side away from the head of the user on the seat.

[0023] Based on the above technical solution, the annular bracket provided on the first side of the headrest can protect the rear projection screen and prevent it from being damaged by external force.

[0024] In combination with the third aspect, in certain implementations of the third aspect, the headrest includes a support portion bent toward a second side, the support portion being used to support the headrest on the second side, where the second side is close to the head of the user on the seat.

[0025] Based on the above technical solution, the headrest includes a support portion bent toward the direction of the user's head. The support portion can support the soft material in the headrest that is in contact with the user's head, thereby providing a comfortable experience for the user.

[0026] In a fourth aspect, the present application provides a rear projection screen, which includes a mounting bracket, and the mounting bracket includes a mounting hole, so that the rear projection screen is fixedly connected to the upper crossbeam of the seat frame through the mounting hole.

[0027] Based on the above technical solution, by setting a mounting hole on the mounting bracket of the rear projection screen, the rear projection screen can be fixed to the upper crossbeam of the backrest frame through the mounting hole, thereby realizing the installation of the rear projection screen on the seat.

[0028] In combination with the fourth aspect, in certain implementations of the fourth aspect, the rear projection screen further includes a rotation axis, and the screen of the rear projection screen rotates around the rotation axis.

[0029] Based on the above technical solution, by providing a rotation axis in the rear projection screen, the user can press the edge of the rear projection screen to rotate the screen around the rotation axis. This allows users with different physical characteristics to adjust the rear projection screen to a position that best suits their viewing experience by pressing the screen edge, helping to enhance the user's viewing experience.

[0030] In some possible implementations, the rear projection screen includes a damping structure, which can be used to prevent the rear projection screen from rotating when the force applied by the user to the screen edge of the rear projection screen is less than or equal to a preset value (for example, the preset value may be 7N-10N) or the user does not press the screen edge.

[0031] In combination with the fourth aspect, in certain implementations of the fourth aspect, the mounting bracket further includes another mounting hole, the seat frame further includes a locating pin, and the size of the another mounting hole matches the size of the locating pin.

[0032] Based on the above technical solution, by providing mounting holes for cooperating with positioning pins on the mounting bracket of the rear projection screen, it is convenient for the installer to install the rear projection screen on the seat frame.

[0033] In a fifth aspect, a seating system is provided, which comprises any possible seat according to the first or second aspect, any possible headrest according to the third aspect, and any possible rear projection screen according to the fourth aspect.

[0034] In the sixth aspect, a vehicle is provided, which includes any possible seat according to the first or second aspect above, or the vehicle includes any possible headrest according to the third aspect, or the vehicle includes any possible rear projection screen according to the fourth aspect, or the vehicle includes the seat system described in the fifth aspect.

[0035] The seat described in the first aspect, the seat described in the second aspect, the headrest described in the third aspect, and the rear projection screen described in the fourth aspect can be combined with each other.

[0036] For example, the structures of the seat of the first aspect and the seat of the second aspect can be combined with each other, such as the seat includes a seat back, the seat back includes a backrest frame, the backrest frame includes an upper crossbeam, the upper crossbeam includes a mounting hole, so that the rear projection screen is fixedly connected to the upper crossbeam through the mounting hole; the seat includes a heat dissipation device, the heat dissipation device includes an air inlet, a fan and an air outlet, the air inlet, the fan and the air outlet are arranged from bottom to top, wherein the rear projection screen is located on the air outlet path of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic diagram of a backrest frame provided in an embodiment of the present application.

[0038] FIG2 is another schematic diagram of the backrest frame provided in an embodiment of the present application.

[0039] FIG3 is a schematic diagram of a rear projection screen provided in an embodiment of the present application.

[0040] FIG4 is a schematic diagram of the rear projection screen provided in an embodiment of the present application rotating around a rotation axis.

[0041] FIG5 is a schematic diagram of a seat provided with a rear projection screen according to an embodiment of the present application.

[0042] FIG6 is a schematic diagram of a heat dissipation structure provided in an embodiment of the present application.

[0043] FIG7 is a schematic diagram showing the positional relationship among the fan, the backrest ventilation bag and the rear projection screen provided in an embodiment of the present application.

[0044] FIG8 is a physical picture of the backrest ventilation bag provided in an embodiment of the present application.

[0045] FIG9 is a schematic diagram of the back panel of the seat back provided in an embodiment of the present application.

[0046] FIG10 is a schematic diagram of multiple ventilation holes and air outlets on a seat cover provided in an embodiment of the present application.

[0047] Figure markings: 100-backrest frame; 110-upper crossbeam; 111-first mounting hole; 112-locating pin; 113-headrest rod mounting hole; 114-headrest rod mounting crossbeam; 120-seat back; 121-back panel; 122-seat cover; 1221-ventilation hole; 130-headrest; 131-front headrest; 132-rear headrest; 133-ring bracket; 140-support part; 200-rear projection screen; 210-mounting bracket; 211-second mounting hole; 220-rotating axis; 300-heat dissipation structure; 310-air outlet; 311-rectangular hole; 320-fan; 330-air inlet; 340-backrest ventilation bag. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a way to describe the association relationship of associated objects, indicating that there can be three kinds of relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. "At least one" means one or more. For example, "at least one of A and B" is similar to "A and / or B", describing the association relationship of associated objects, indicating that there can be three kinds of relationships, for example, at least one of A and B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0049] In the embodiments of the present application, prefixes such as "first" and "second" are used only to distinguish different description objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects. In the embodiments of the present application, the use of prefixes such as ordinal numbers to distinguish description objects does not constitute a restriction on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and no unnecessary restrictions should be constituted due to the use of such prefixes. In addition, in the description of this embodiment, unless otherwise specified, the meaning of "plurality" is two or more. The embodiments of the present application provide a chair, which includes a backrest frame 100, the backrest frame 100 includes an upper crossbeam 110, and the upper crossbeam 110 includes a first mounting hole 111, so that the rear projection screen 200 is fixedly connected to the upper crossbeam 110 through the first mounting hole 111.

[0050] The above rear-projection screen can also be called a light field screen. When the rear-projection screen is fixed to the backrest frame, when the human eye is at a certain distance from the backrest, the human eye can see a magnified high-definition virtual image when looking at the rear-projection screen. This achieves a 3-meter viewing distance, a quasi-3D effect, and a 40-inch visual experience. At the same time, placing the rear-projection screen on the backrest frame can achieve long-range imaging anti-shake and motion perception synchronization, effectively preventing users from motion sickness. The rear-projection screen uses diffuse reflection imaging, which has the advantages of avoiding direct blue light and protecting eyesight. The human eye is always in a state of distance viewing, with the lens flattened and the ciliary muscle relaxed.

[0051] In order to accommodate a large rear projection screen within the seat back, the seat back frame structure required a redesign. Unlike conventional back frames, which typically have an upper crossbar, the back frame in this embodiment replaces the headrest upper crossbar with an upper crossbar. This structure serves two purposes: 1. Providing sufficient frame strength; 2. Providing a mounting point for the headrest rod. The mounting holes on the rear projection screen mate with the mounting structure on the back frame, ensuring a stable attachment of the rear projection screen to the back frame.

[0052] 1 shows a schematic diagram of a backrest frame 100 provided in an embodiment of the present application. The backrest frame 100 may include an upper crossbeam 110 , and the upper crossbeam 110 includes a first mounting hole 111 .

[0053] Optionally, the upper crossbeam 110 further includes a positioning pin 112, which is used to assist in positioning the rear projection screen 200. When the rear projection screen 200 is assembled to the backrest frame 100, the positioning pin 112 can be used to first position the rear projection screen 200, thereby facilitating the first mounting hole 111 to cooperate with the mounting structure on the rear projection screen 200.

[0054] For example, Figure 2 shows another schematic diagram of a backrest frame 100 provided in an embodiment of the present application. The upper crossbeam 110 may include a headrest rod mounting hole 113 and a headrest rod mounting crossbeam 114. A headrest guide sleeve mounting conduit may be arranged on the headrest mounting crossbeam 114. This headrest mounting crossbeam 114 can be used to secure the headrest and increase its strength, thereby meeting regulatory requirements.

[0055] 3 shows a schematic diagram of a rear projection screen 200 provided in an embodiment of the present application. The rear projection screen 200 includes a mounting bracket 210, which includes a second mounting hole 211, so that the rear projection screen 200 is fixedly connected to the upper crossbeam 110 of the backrest frame 100 through the second mounting hole 211.

[0056] Optionally, the rear projection screen 200 further includes a rotation axis 220 .

[0057] Due to the different body sizes of different users, different users have different requirements for the tilt angle of the rear projection screen. To meet the needs of different users, the rear projection screen 200 can be rotated around the rotation axis 220 within a certain angle range. For example, the angle range is [-25°, 25°].

[0058] For example, the rear projection screen 200 itself can rotate about the Y-axis (perpendicular to the vehicle's forward direction). To adjust the screen angle, the user can press the edge of the screen with a finger, pushing the rear projection screen 200 to rotate about the rotation axis 220, allowing the screen to rotate within a range of [-25°, 25°].

[0059] The above Y-axis direction can also be understood as a direction perpendicular to the vehicle's forward direction (X-axis direction).

[0060] Optionally, the rear projection screen 200 includes a damping structure, which can be used to prevent the rear projection screen 200 from rotating when the force applied by the user to the edge of the screen is less than or equal to a preset value (for example, the preset value may be 7N-10N) or the user does not apply any force to the edge of the screen.

[0061] For example, FIG4 shows a schematic diagram of the rear projection screen 200 provided in an embodiment of the present application rotating around the rotation axis 220 .

[0062] Optionally, the first mounting hole 111 can be matched with the second mounting hole 211 through a connecting member (for example, a bolt) so that the rear projection screen 200 is fixed on the upper beam 110 .

[0063] This embodiment of the present application also provides a headrest 130 positioned within a seat, which is equipped with a rear projection screen 200. A ring-shaped bracket 133 is provided on a first side of the headrest 130, with the rear projection screen 200 positioned within the ring-shaped bracket 133. The first side is the side facing away from the head of the user in the seat. This ring-shaped bracket provided on the first side of the headrest protects the rear projection screen from damage caused by external forces. The first side can also be understood as the front side of the headrest.

[0064] In order to prevent the rear projection screen 200 from affecting the comfort of the seat, the rear projection screen 200 can be arranged on the back of the headrest 130. In order to provide a soft feeling when the user's head contacts the headrest 130, a ring bracket 133 can be arranged on the back of the headrest 130.

[0065] For example, Figure 5 shows a schematic diagram of a seat equipped with a rear projection screen 200 according to an embodiment of the present application. A headrest 130 can be inserted into the seat back 120. The headrest 130 can be divided into a front headrest 131 and a rear headrest 132. The rear headrest 132 includes an annular bracket 133, within which the rear projection screen 200 can be positioned, providing protection for the rear projection screen 200.

[0066] As shown in FIG. 5 , the annular bracket 133 may extend from the seat back 120 and into the headrest 130 , and the rear projection screen 200 may be located inside the annular bracket 133 .

[0067] Optionally, as shown in FIG5 , a support portion 140 extends from the seat back 120 . The support portion 140 bends toward the position of the user's head after extending from the seat back 120 . The support portion 140 can support the soft material on the headrest, thereby providing a comfortable experience for the user. The rear projection screen 200 generates heat when it is working. Through simulation, it was found that when the outside temperature is 74°, the temperature of the seat equipped with the rear projection screen 200 can reach about 93°. Because a part of the rear projection screen 200 body is located inside the seat back 120 and the internal space of the seat back 120 is enclosed. In order to ensure that the temperature inside the seat does not become too high due to the heat generated by the rear projection screen 200, a heat dissipation structure 300 can be arranged inside the seat back 120.

[0068] Optionally, the heat dissipation structure 300 may include an air outlet 310 , a fan 320 and an air inlet 330 , wherein the air inlet 330 , the fan 320 and the air outlet 310 are arranged from bottom to top, and the rear projection screen 200 is located on the air outlet path of the fan 320 .

[0069] For example, Figure 6 shows a schematic diagram of a heat dissipation structure 300 provided in an embodiment of the present application. The heat dissipation device 300 also includes a backrest ventilation bag 340, one end of which is connected to the fan 320 and the other end of which is provided with an air outlet. The rear projection screen 200 is located in the air outlet path of the air outlet of the backrest ventilation bag 340.

[0070] For example, Figure 7 shows a schematic diagram of the positional relationship between the fan 320, backrest ventilation bag 340, and rear projection screen 200, as provided in an embodiment of the present application. The backrest ventilation bag 340 is connected to the fan 320 at one end and has an air outlet at the other end, which is aligned with the rear projection screen 200. The rest of the backrest ventilation bag 340 is a fully enclosed structure. The airflow from the fan 320 passes through the backrest ventilation bag 340, where it is focused, and then blows toward the rear projection screen 200, thereby enhancing the cooling effect on the rear projection screen 200.

[0071] For example, Figure 8 shows a photo of a backrest ventilation bag 340 provided in an embodiment of the present application. The backrest ventilation bag 340 is a three-dimensional (3D) textile structure that allows airflow through it and provides good support to prevent collapse after long-term riding.

[0072] Optionally, the seat includes a back panel 121 having a recessed portion, and the air inlet 330 may be located in the recessed portion. For example, FIG9 shows a schematic diagram of the back panel 121 of the seat back provided in an embodiment of the present application. The back panel 121 includes an air outlet 310 and an air inlet 320. As can be seen, the air inlet 330 is located in the recessed portion of the back panel 121, near the knee space of the rear passengers. The air inlet 330 is arranged here for the following reasons:

[0073] (1) Air rises when heated.

[0074] (2) The air inlet is located in the recessed area of ​​the knee space below the backrest, making it difficult to be found and not affecting the appearance of the seat.

[0075] (3) The knee space is located far away from the human body, and it is not easy for the human body to feel the wind entering.

[0076] Exemplarily, the distance between the air inlet 330 and the ground inside the vehicle cabin is [200 mm, 500 mm].

[0077] Optionally, the seat back 120 includes a seat cover 122 , on which a plurality of ventilation holes 1221 are provided. The arrangement positions of at least some of the plurality of ventilation holes 1221 correspond to the arrangement positions of the air outlets 310 .

[0078] Optionally, the size of the air outlet 310 is larger than the size of the ventilation hole 1221. For example, the area of ​​the air outlet is larger than the area of ​​the ventilation hole.

[0079] Optionally, a projection area of ​​at least part of the ventilation holes on a preset plane (eg, the ground) is located within a projection area of ​​the air outlet on the preset plane.

[0080] Optionally, the air outlet 310 is located in a top area of ​​the seat back 120 .

[0081] For example, Figure 10 shows a schematic diagram of multiple ventilation holes 1221 and air outlets 310 on a seat cover according to an embodiment of the present application. The multiple ventilation holes 1221 may be circular holes. The air outlets 310 may be located in the top area of ​​the seat back 120 and may be rectangular holes 311. Each rectangular hole 311 may be aligned with at least a portion of the multiple ventilation holes 1221.

[0082] Optionally, the ventilation hole 1221 may be located on a shoulder cover of the seat back 120 and the air outlet 310 may be located below the shoulder cover.

[0083] In this embodiment, air outlet 310 is located at the top of seat back 120. This is done to account for the tendency of heated air to rise. Furthermore, this allows for the reuse of ventilation holes on the shoulder cover, eliminating the need for additional holes in the cover. The holes in the cover are circular, while the holes in air outlet 310 are rectangular. The precise arrangement and placement of these two holes ensures that the air outlet is not obstructed, enhancing ventilation.

[0084] An embodiment of the present application also provides a seating system, which includes the above-mentioned seat and a rear projection screen.

[0085] An embodiment of the present application also provides a vehicle, which includes the above-mentioned seat, or the vehicle includes the above-mentioned pillow, or the vehicle includes the above-mentioned rear projection screen, or the vehicle includes the above-mentioned seat system.

[0086] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0087] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0088] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0089] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0090] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0091] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0092] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A seat, characterized in that: The seat is equipped with a rear projection screen, and the seat includes a heat dissipation device, which includes an air inlet, a fan and an air outlet. The air inlet, the fan and the air outlet are arranged from bottom to top, wherein: The rear projection screen is located on the air outlet path of the fan.

2. The seat according to claim 1, characterized in that: The seat comprises a seat cover, on which a plurality of ventilation holes are arranged, and at least some of the plurality of ventilation holes are arranged at positions corresponding to the arrangement positions of the air outlets.

3. The seat according to claim 1 or 2, characterized in that: The heat dissipation device also includes a backrest ventilation bag, One end of the backrest ventilation bag is connected to the fan and the other end of the backrest ventilation bag is provided with an air outlet, and the rear projection screen is located on the air outlet path of the air outlet of the backrest ventilation bag.

4. The seat according to any one of claims 1 to 3, characterized in that: The air outlet is located in a top area of ​​a seat back in the seat.

5. The seat according to any one of claims 1 to 4, characterized in that: The seat comprises a seat back plate, a recessed portion is arranged on the seat back plate, and the air inlet is arranged in the recessed portion.

6. A seat, characterized in that: The seat comprises a backrest frame, the backrest frame comprises an upper crossbeam, and the upper crossbeam comprises a first mounting hole, so that the rear projection screen is fixedly connected to the upper crossbeam through the first mounting hole.

7. The seat according to claim 6, characterized in that The upper crossbeam includes positioning pins, and the positioning pins are used to position the rear projection screen.

8. A headrest, characterized in that: The headrest is located in the seat, a rear projection screen is installed on the seat, a ring bracket is provided on the first side of the headrest, and the rear projection screen is located inside the ring bracket; The first side is a side away from the head of the user on the seat.

9. The headrest according to claim 8, characterized in that: The headrest includes a support portion bent toward a second side, wherein the support portion is used to support the headrest on the second side, where the second side is a side close to the head of a user on the seat.

10. A rear projection screen, characterized in that: The rear projection screen includes a mounting bracket, and the mounting bracket includes a first mounting hole, so that the rear projection screen is fixedly connected to the upper crossbeam of the seat frame through the first mounting hole.

11. The rear projection screen according to claim 10, characterized in that: The rear projection screen also includes a rotation axis, and the screen of the rear projection screen rotates around the rotation axis.

12. The rear projection screen according to claim 10 or 11, characterized in that: The mounting bracket further includes a second mounting hole, and the seat frame further includes a positioning pin, and the size of the second mounting hole matches the size of the positioning pin.

13. A seat system, characterized in that: The seat system comprises a seat as described in any one of claims 1-7, a headrest as described in claim 8 or 9, and a rear projection screen as described in any one of claims 10-12.

14. A vehicle, characterized in that: The vehicle comprises a seat as described in any one of claims 1-7, or the vehicle comprises a headrest as described in claim 8 or 9, or the vehicle comprises a rear projection screen as described in any one of claims 10-12, or the vehicle comprises a seat system as described in claim 13.

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