Display device

Abstract

The utility model discloses a display device, which belongs to the technical field of projection display, and comprises a shell, a rotating shaft, a scroll screen and an elastic buffer piece, the rotating shaft is arranged in the shell, and the buffering piece surrounds the rotating shaft. The scroll screen is provided with a first end and a second end which are oppositely arranged, the first end is connected with the buffer part, and the buffer part is used for supporting the scroll screen to reduce the contact area between the scroll screen and the rotating shaft; the shell is provided with an opening, and when the rotating shaft is rotated, the second end penetrates through the opening to be away from or close to the rotating shaft. The elastic buffer part is arranged around the rotating shaft, the first end of the scroll screen is connected with the buffer part, and when the scroll screen is wound on the rotating shaft, the buffer part supports the scroll screen, so that the contact area of the scroll screen and the rotating shaft can be reduced, the situation of stress concentration on the scroll screen is reduced, indentations on the scroll screen are reduced or partially reduced, and the service life of the scroll screen is prolonged. The watching effect is improved. And the design of most rolling screens in the market can be compatible, the structure is simple, implementation is easy, and the cost is low.

Description

Technical Field

[0001] The present application relates to the technical field of projection display, and more particularly, to a display device. Background Art

[0002] A liftable projection screen is a common form of projection screen and can be applied to places such as homes, meeting rooms, and cars. When the projection screen is idle, it will be wound onto a winding shaft, thus saving space. However, due to some structural unevenness on the winding shaft, periodic stripe-shaped indentations will appear on the screen surface after long-term winding, seriously affecting the viewing experience. Summary of the Utility Model

[0003] The present application provides a display device to improve the above defects.

[0004] In a first aspect, the present application provides a display device, including: a housing, a rotating shaft, a scroll screen, and an elastic buffer member; the rotating shaft is disposed inside the housing, and the buffer member surrounds the rotating shaft; the scroll screen has a first end and a second end disposed opposite to each other, the first end is connected to the buffer member, and the buffer member is used to support the scroll screen to reduce the contact area between the scroll screen and the rotating shaft; the housing is provided with an opening, and when the rotating shaft is rotated, the second end passes through the opening to move away from or close to the rotating shaft.

[0005] Optionally, for a possible implementation, the elastic modulus of the buffer member is less than the elastic modulus of the scroll screen.

[0006] Optionally, for a possible implementation, it includes at least two elastic buffer members, and the buffer members are at least fixed at both ends of the rotating shaft.

[0007] Optionally, for a possible implementation, each of the buffer members is disposed on the same side of the rotating shaft.

[0008] Optionally, for a possible implementation, the rotating shaft includes a undulating portion, the undulating portion is located between the two buffer members, and the undulating portion and the buffer member are disposed on the same side of the rotating shaft.

[0009] Optionally, for a possible implementation, the length of each buffer member in the circumferential direction of the rotating shaft is greater than the circumference of the rotating shaft in the circumferential direction.

[0010] Optionally, for a possible implementation, the buffer member includes a first portion and a second portion connected in sequence in the circumferential direction of the rotating shaft, and the second portion has a uniform thickness in the radial direction of the rotating shaft; the first portion has a first end and a second end disposed opposite to each other, the first end is connected to the second portion, and the thickness in the radial direction of the rotating shaft gradually changes from the first end to the second end, and the thickness of the first end in the radial direction of the rotating shaft is greater than the thickness of the second end in the radial direction of the rotating shaft.

[0011] Optionally, for a possible implementation, based on the spacing L between two adjacent buffer members, the elastic modulus E of the scroll screen, the thickness h of the scroll screen, the thickness D of the buffer member, the acceleration of gravity g, and the density of the scroll screen, the satisfied relationship is

[0012] Optionally, for a possible implementation, it further includes: a support member having a first connection portion and a second connection portion, the first connection portion is hinged to the housing, and the second connection portion is hinged to the second end of the scroll screen.

[0013] Optionally, for a possible implementation, it further includes: a driving member disposed on the housing and connected to the rotating shaft for driving the rotating shaft to rotate.

[0014] The present application provides a display device, including: a housing, a rotating shaft, a scroll screen, and an elastic buffer member; the rotating shaft is disposed inside the housing, and the buffer member is disposed around the rotating shaft; the scroll screen has a first end and a second end disposed opposite to each other, the first end is connected to the buffer member, and the buffer member is used to support the scroll screen to reduce the contact area between the scroll screen and the rotating shaft; the housing is provided with an opening, and when the rotating shaft is rotated, the second end passes through the opening to move away from or close to the rotating shaft.

[0015] The elastic buffer member is disposed around the rotating shaft, and the first end of the scroll screen is connected to the buffer member. When the scroll screen is wound around the rotating shaft, the buffer member supports the scroll screen, which can reduce the contact area between the scroll screen and the rotating shaft, thereby reducing the occurrence of stress concentration on the scroll screen, achieving the reduction or partial reduction of the indentation on the scroll screen, and improving the viewing effect. Moreover, the application can be compatible with the designs of most retractable screens on the market, with a simple structure, easy to implement, and low cost.

[0016] Other features and advantages of the present application will be described in the subsequent specification, and, in part, will become apparent from the specification or will be understood by implementing the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures specifically pointed out in the written specification, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0018] Figure 1 Shows a side structural schematic diagram of the display device provided by the embodiment of the present application;

[0019] Figure 2 Shows a front structural schematic diagram of the display device provided by the embodiment of the present application;

[0020] Figure 3 Shows a side structural schematic diagram of the rotating shaft provided by the embodiment of the present application;

[0021] Figure 4 Shows a partial cross-sectional structural schematic diagram of the rotating shaft provided by the embodiment of the present application;

[0022] Figure 5 Shows a cross-sectional structural schematic diagram of the rotating shaft provided by the embodiment of the present application;

[0023] Figure 6 Shows a cross-sectional structural schematic diagram of the rotating shaft provided by another embodiment of the present application;

[0024] Figure 7 Shows a cross-sectional structural schematic diagram of the rotating shaft provided by another embodiment of the present application;

[0025] Figure 8 Shows a partially enlarged structural schematic diagram of the buffer structure provided by the embodiment of the present application;

[0026] Figure 9 Shows a partially enlarged structural schematic diagram of the buffer structure provided by another embodiment of the present application;

[0027] Figure 10 Shows a cross-sectional schematic diagram of the buffer structure provided by the embodiment of the present application;

[0028] Figure 11 Shows a front structural schematic diagram of the display device provided by another embodiment of the present application;

[0029] Figure 12 Shows a front structural schematic diagram of the display device provided by another embodiment of the present application;

[0030] Figure 13 Shows a schematic diagram of the hinge structure provided by the embodiment of the present application;

[0031] Figure 14The structural schematic diagram of the fixed connection provided by the embodiment of the present application is shown.

[0032] Explanation of reference numerals:

[0033] 1. Housing; 2. Rotating shaft; 3. Reel screen; 31. First end; 32. Second end; 4. Buffer member; 41. First part; 42. Second part; 43. First surface; 44. Second surface; 411. Third end; 412. Fourth end; 5. Support member. Detailed implementation manners

[0034] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Usually, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application to be protected, but only represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0035] It should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0036] The lifting projection screen is a common form of projection screen and can be applied to places such as homes, meeting rooms, and cars. When the projection screen is idle, it will be wound onto the winding shaft, thus saving space. However, due to some structural unevenness on the winding shaft, periodic stripe-shaped indentations will appear on the screen surface after long-term winding, seriously affecting the viewing experience.

[0037] Therefore, in the embodiments of the present application, a display device is provided to solve or partially solve the above problems.

[0038] Please refer to Figures 1-4 , which shows a side structural schematic diagram of a display device provided by an embodiment of the present application. The device includes: a housing 1, a rotating shaft 2, a reel screen 3, and an elastic buffer member 4.

[0039] The rotating shaft 2 is arranged inside the housing 1, and the buffer member 4 is arranged around the rotating shaft 2.

[0040] The scroll screen 3 has a first end 31 and a second end 32 that are oppositely disposed. The first end 31 is connected to the buffer member 4 . The buffer member 4 is used to support the scroll screen 3 to reduce the contact area between the scroll screen 3 and the rotating shaft 2 .

[0041] The housing 1 is provided with an opening, and when the rotating shaft 2 is rotated, the second end 32 passes through the opening and moves away from or close to the rotating shaft 2 .

[0042] It should be noted that the scroll screen 3 is made of flexible material, and the scroll screen 3 can be a screen for projection. The projection can be achieved by emitting corresponding light from a projector to illuminate the scroll screen 3. Exemplarily, the scroll screen 3 is an anti-light screen.

[0043] The buffer is made of a flexible material and has elasticity. For example, the buffer may be in the shape of a regular long strip, or in an irregular shape.

[0044] It should be noted that due to the tolerance of the shaft during the processing, or the deformation caused by the temperature difference, concave and convex undulating areas appear on the surface of the shaft, and the existing scroll screen is fixed on the shaft, and when the scroll screen is in the storage state, the scroll screen is wrapped around the shaft along the circumference of the shaft. The scroll screen is wrapped around the shaft for a long time, and the scroll screen is prone to stress concentration at the uneven position of the shaft surface, resulting in periodic indentations on the surface of the scroll screen, affecting the viewing effect.

[0045] The elastic buffer of the present application is arranged around the rotating shaft, and the first end of the scroll screen is connected to the buffer. When the scroll screen is wound around the rotating shaft, the buffer can at least partially support the scroll screen, which can reduce the contact area between the scroll screen and the rotating shaft, thereby avoiding stress concentration on the scroll screen, reducing or partially reducing the indentation on the scroll screen, and improving the viewing effect.

[0046] Moreover, the present application is compatible with most roll-up screen designs on the market, has a simple structure, is easy to implement, and has a low cost.

[0047] Furthermore, the elastic modulus of the buffer member 4 is smaller than the elastic modulus of the scroll screen 3 .

[0048] Since the elastic modulus of the buffer 4 is smaller than that of the scroll screen 3, that is, the hardness of the buffer 4 is smaller than that of the scroll screen 3, when the scroll screen 3 is in the storage state, the compression between the buffer 4 and the scroll screen 3 will not cause new indentations on the scroll screen 3. That is, the present application can reduce or partially reduce the indentations caused by the uneven surface of the shaft 2 through the buffer 4, and will not increase new indentations, which can effectively improve the viewing effect.

[0049] Preferably, the buffer is a flexible material buffer layer with a certain thickness and width, which can be a foam material or a flexible porous material with good compressibility and resilience, such as EVA foam, PE foam, acrylic foam, etc. Among them, the porous material has better compressibility and resilience, which can avoid new indentations on the scroll screen.

[0050] Preferably, the width of the buffer is more than 10 times the thickness of the buffer, which can achieve a better support effect.

[0051] Further, please refer to Figure 2 , which includes at least two elastic buffers 4, and the buffer 4 is at least fixed at both ends of the rotating shaft 2. The contact area between the scroll screen 3 and the rotating shaft 2 can be further reduced, thereby reducing the indentations caused by the uneven surface of the rotating shaft 2.

[0052] Further, the rotating shaft includes a undulating portion, the undulating portion is located between the two buffers, and the undulating portion and the buffer are arranged on the same side of the rotating shaft.

[0053] There is an uneven undulating area on the surface of the rotating shaft at the position of the undulating portion. The undulating portion is located between the two buffers and is arranged on the same side of the rotating shaft as the buffer. The buffers at both ends of the undulating portion are used to support the scroll screen, which can reduce the contact area between the scroll screen and the undulating portion and reduce the indentations on the scroll screen caused by the undulating portion.

[0054] Preferably, please refer to Figure 5 , which shows a cross-sectional view of the rotating shaft 2 in the axial direction. The length of the buffer 4 in the circumferential direction of the rotating shaft 2 is less than the circumference of the rotating shaft 2 in the circumferential direction, that is, the buffer 4 does not completely cover the rotating shaft 2, and the undulating portion and the buffer 4 are arranged on the same side of the rotating shaft 2.

[0055] Preferably, please refer to Figure 6 , which shows a cross-sectional view of the rotating shaft 2 in the axial direction. The length of the buffer 4 in the circumferential direction of the rotating shaft 2 is equal to the circumference of the rotating shaft 2 in the circumferential direction, that is, the buffer 4 completely covers the rotating shaft 2.

[0056] Preferably, please refer to Figure 7 , which shows a cross-sectional view of the rotating shaft 2 in the axial direction. The length of each buffer 4 in the circumferential direction of the rotating shaft 2 is greater than the circumference of the rotating shaft 2 in the circumferential direction, that is, the buffer 4 completely covers the rotating shaft 2 and part of the buffer 4 overlaps. The contact area between the scroll screen 3 and the rotating shaft 2 can be further reduced.

[0057] Further, the thickness of the buffer layer is greater than a threshold value, and the threshold value is the maximum deformation amount generated in the radial direction of the rotating shaft when the buffer layer is extruded by the scroll screen.

[0058] When the thickness of the buffer layer is greater than the threshold value, when the scroll screen is in the stored state, the scroll screen can be made not to contact the rotating shaft, that is, the contact area between the two is 0, so as to eliminate the indentation caused by the uneven surface of the rotating shaft.

[0059] It should be noted that the threshold value can be obtained based on experience.

[0060] Furthermore, please refer to Figure 9 , the buffer member 4 includes a first part 41 and a second part 42 connected in sequence in the circumferential direction of the rotating shaft 2, and the second part 42 has a uniform thickness in the radial direction of the rotating shaft 2.

[0061] The first part 41 has a third end 411 and a fourth end 412 arranged oppositely, the third end 411 is connected to the second part 42, and the thickness from the third end 411 to the fourth end 412 is gradually changing in the radial direction of the rotating shaft 2, and the thickness of the third end 411 in the radial direction of the rotating shaft 2 is greater than the thickness of the fourth end 412 in the radial direction of the rotating shaft 2.

[0062] When the first end of the scroll screen is connected to the buffer member, the thickness from the third end to the fourth end gradually decreases, which is beneficial to keeping the scroll screen flat and preventing new indentations from being generated.

[0063] Furthermore, the buffer member includes a first part, a second part and a third part connected in sequence in the circumferential direction of the rotating shaft, and the second part has a uniform thickness in the radial direction of the rotating shaft.

[0064] The first part has a third end and a fourth end arranged oppositely, the third end is connected to the second part, and the thickness from the third end to the fourth end is gradually changing in the radial direction of the rotating shaft, and the thickness of the third end in the radial direction of the rotating shaft is greater than the thickness of the fourth end in the radial direction of the rotating shaft.

[0065] The third part has a fifth end and a sixth end arranged oppositely, the fifth end is connected to the second part, and the thickness from the fifth end to the sixth end is gradually changing in the radial direction of the rotating shaft, and the thickness of the fifth end in the radial direction of the rotating shaft is greater than the thickness of the sixth end in the radial direction of the rotating shaft.

[0066] It can make the buffer member connect with the rotating shaft more smoothly and also connect with the scroll screen more smoothly, and can avoid new indentations on the scroll screen.

[0067] It should be noted that please refer to Figure 8 , the buffer member 4 can be a material structure with a single thickness, please refer to Figure 9 , or it can be a structure with a certain transitional shape at the head and tail, having a smoother transitional effect.

[0068] Furthermore, please refer to Figure 8, the buffer member 4 has a first surface 43 and a second surface 44 which are oppositely arranged. The first surface 43 is connected to the circumferential surface of the rotating shaft 2, and the cross-sectional shape of the buffer member 4 in the circumferential direction of the rotating shaft 2 can be various.

[0069] Exemplarily, the cross-sectional shape of the buffer member in the circumferential direction of the rotating shaft can be a rectangle.

[0070] Exemplarily, the cross-sectional shape of the buffer member in the circumferential direction of the rotating shaft can be a trapezoid. And when viewed in the circumferential direction of the rotating shaft, the side corresponding to the first surface is the lower base of the trapezoid, and the side corresponding to the second surface is the lower base of the trapezoid. This can make the buffer member connect with the scroll screen more smoothly and avoid new indentations on the scroll screen.

[0071] Exemplarily, refer to Figure 10 , the cross-sectional shape of the buffer member in the circumferential direction of the rotating shaft can be an irregular circle. When viewed from the circumferential direction of the rotating shaft, the line corresponding to the first surface 43 is a straight line, and the line corresponding to the second surface 44 is an arc. The two ends of the straight line are connected to the two ends of the arc. Since the surface of the buffer member in contact with the scroll screen is arc-shaped, it makes the buffer member connect with the scroll screen more smoothly and the scroll screen does not generate new indentations.

[0072] Further, based on the distance L between two adjacent buffer members, the elastic modulus E of the scroll screen, the thickness h of the scroll screen, the thickness D of the buffer member, the gravitational acceleration g, and the density ρ of the scroll screen, the satisfied relationship is

[0073] Specifically, the maximum interval of the buffer members can be estimated in a certain way. Simplify the situation of the scroll screen being suspended and deformed into a simply supported beam deflection problem. Please refer to Figures 13-14 , where Figure 13 shows a schematic diagram of a hinge connection, Figure 14 shows a schematic diagram of a fixed connection. The support of the buffer member 4 is between the hinge connection and the fixed connection. Then, when the scroll screen 3 is subjected to a uniform force (gravity) between two buffer members with a distance L, the maximum deflection in the case of a fixed connection is: The maximum deflection in the case of a hinge connection is Obviously, w 固 <w 铰 ; the uniform force q = ρghb (N / m), ρ is the density of the scroll screen 3, g is the gravitational acceleration, h is the thickness of the scroll screen 3, b is the width of the scroll screen 3; E is the elastic modulus of the scroll screen 3, and I = bh 3 / 12 is the section modulus of the scroll screen 3. Thus, it can be obtained that

[0074] Therefore, when the thickness of the buffer member 4 is D, the distance L between the buffer members 4 needs to satisfy ω < D to ensure that the scroll screen will not contact the surface of the rotating shaft, that is Considering the actual situation, the scroll screen 3 is wound in multiple layers, and there will be certain deformation restrictions between them. Generally, it can be estimated according to the fixed connection method.

[0075] Exemplarily, taking a PET film with h = 0.1 mm as an example, its E = 3 GPa, ρ = 1.37 g / cm3. Taking a rectangular cross-section buffer, with a thickness D = 1 mm, and estimating according to the fixed connection method, when L < 315 mm, the condition that the scroll screen and the rotating shaft do not contact can be satisfied, and it can be optimized and adjusted according to the actual situation.

[0076] Further, please refer to Figure 11 , which has 3 elastic buffer members 4, arranged at intervals on the rotating shaft 2, and the distance between two adjacent buffer members 4 is the same.

[0077] Further, please refer to Figure 12 , which has 4 elastic buffer members 4, arranged at intervals on the rotating shaft 2, and the distance between two adjacent buffer members 4 is the same.

[0078] It should be noted that the number of buffer members can be determined according to the actual situation.

[0079] Further, please refer to Figure 1 , which further includes: a support member 5. The support member 5 has a first connection portion and a second connection portion. The first connection portion is hinged to the housing 1, and the second connection portion is hinged to the second end 32 of the scroll screen 3.

[0080] Since the first connection portion of the support member 5 is hinged to the housing 1, and the second connection portion of the support member 5 is hinged to the second end 32 of the scroll screen 3, when the scroll screen 3 is opened, due to the gravity of the support member 5, the support member 5 is used to support the scroll screen 3 to make the surface of the scroll screen 3 flat.

[0081] Further, it further includes: a driving member, which is arranged on the housing and connected to the rotating shaft for driving the rotating shaft to rotate.

[0082] In one embodiment, the buffer member is a flexible material buffer layer with a certain thickness and width, and its elastic modulus is lower than that of the material of the scroll screen. A foam material with good compressibility and resilience can be used. The buffer member is installed at the position where the rotating shaft is connected to the scroll screen, and the buffer members are arranged at intervals. Its function is to separate the undulating structures on the scroll screen and the rotating shaft, so that the scroll screen is suspended to avoid forming indentations due to long-term extrusion and will not generate new indentations. This application can be compatible with most of the retractable screen designs on the market, with a simple structure, easy to implement, and low cost.

[0083] The present application also provides a vehicle system, including: a main body and the aforementioned display device, wherein the main body is provided with a mounting position, and the display device is configured to be fixed at the mounting position.

[0084] Exemplarily, the vehicle system may be a vehicle.

[0085] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A display device, characterized in that: include: Shell, rotating shaft, scroll screen and elastic buffer; The rotating shaft is arranged in the housing, and the buffer is arranged around the rotating shaft; The scroll screen has a first end and a second end that are arranged opposite to each other, the first end is connected to the buffer, and the buffer is used to support the scroll screen to reduce the contact area between the scroll screen and the rotating shaft; The shell is provided with an opening, and when the rotating shaft is rotated, the second end passes through the opening and moves away from or close to the rotating shaft.

2. The display device according to claim 1, characterized in that The elastic modulus of the buffer is smaller than the elastic modulus of the scroll screen.

3. The display device according to claim 2, characterized in that: It comprises at least two elastic buffers, and the buffers are fixed at least at two ends of the rotating shaft.

4. The display device according to claim 3, characterized in that: Each of the buffer components is arranged on the same side of the rotating shaft.

5. The display device according to claim 4, characterized in that: The rotating shaft comprises an undulating portion, the undulating portion is located between the two buffer members, and the undulating portion and the buffer members are arranged on the same side of the rotating shaft.

6. The display device according to claim 1, characterized in that: The length of each buffer member in the circumferential direction of the rotating shaft is greater than the circumference of the rotating shaft in the circumferential direction.

7. The display device according to claim 1, characterized in that: The buffer member comprises a first portion and a second portion connected in sequence in the circumferential direction of the shaft, and the thickness of the second portion in the radial direction of the shaft is uniform; The first part has a first end and a second end that are arranged opposite to each other, the first end is connected to the second part, the thickness in the radial direction of the shaft is gradually changed from the first end to the second end, and the thickness of the first end in the radial direction of the shaft is greater than the thickness of the second end in the radial direction of the shaft.

8. The display device according to claim 1, characterized in that: Based on the distance L between two adjacent buffers, the elastic modulus E of the scroll screen, the thickness h of the scroll screen, the thickness D of the buffer, the gravitational acceleration g and the density of the scroll screen, the relationship satisfied is:

9. The display device according to claim 1, characterized in that: Also includes: The support member has a first connection portion and a second connection portion, the first connection portion is hinged to the shell, and the second connection portion is hinged to the second end of the scroll screen.

10. The display device according to claim 1, characterized in that: Also includes: A driving member is disposed on the housing and connected to the rotating shaft to drive the rotating shaft to rotate.

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