CN112349206B

CN112349206B - Foldable display device

Info

Publication number: CN112349206B
Application number: CN202011239841.XA
Authority: CN
Inventors: 张晓音
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2022-07-12
Anticipated expiration: 2040-11-09
Also published as: CN112349206A

Abstract

The invention provides a foldable display device. The foldable display device comprises a bending area and a non-bending area; the first heat dissipation assembly is positioned in the bending area and comprises a base; the base comprises an inner cavity and at least one first opening; the fixing strip is rotatably connected with the base; the fixing strip is provided with at least one groove; the groove is communicated with the inner cavity and used for transmitting heat of the display device to the first opening, and the first opening is used for diffusing the heat transmitted to the bending area to the outside of the display device. According to the foldable display device, the first heat dissipation assembly is arranged in the bending area of the foldable display device and comprises the groove and the inner cavity structure which are mutually communicated, so that heat of the display device can be transmitted to the first opening which is in contact with the outside, the heat is led out of the display device through the first opening, the heat accumulated at the bending area is dissipated, and the normal work of the bending area is ensured.

Description

Foldable display device

[ technical field ] A

The invention relates to the technical field of display, in particular to a foldable display device.

[ background of the invention ]

The existing foldable display device includes an organic light emitting display panel. The foldable display device may be foldable about a folding axis, and the organic light emitting display panel may be bent and provide display images at a plurality of bent positions.

With the more and more diversified functions of products, the foldable display device has higher and higher requirements on heat dissipation. The flexible screen product involves the product folding, rotatory in the use, and traditional radiating mode is mostly paste passive radiating mode such as fin, radiating block, so traditional radiating mode can't guarantee the product can both guarantee better radiating effect when arbitrary angle and scene are used.

Therefore, how to efficiently dissipate heat of the foldable display device is becoming a very important issue in the current display panel.

[ summary of the invention ]

In order to solve the above problems, the present invention provides a foldable display device.

A foldable display device includes a bending region and a non-bending region;

the first heat dissipation assembly is positioned in the bending area and comprises a base; the base comprises an inner cavity and at least one first opening;

the fixing strip is rotatably connected with the base; the fixing strip is provided with at least one groove;

the groove is communicated with the inner cavity and used for transmitting heat of the display device to the first opening, and the first opening is used for diffusing the heat transmitted to the bending area to the outside of the display device.

According to the foldable display device provided by the embodiment of the invention, the first heat dissipation assembly is arranged in the bending area of the foldable display device and comprises the groove and the inner cavity structure which are communicated with each other, so that the heat of the display device can be transmitted to the first opening which is in contact with the outside, and the heat is led out of the display device through the first opening, so that the heat accumulated at the bending area is dissipated, and the normal work of the bending area is ensured.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a foldable display device according to an embodiment of the present invention;

FIG. 2 is a schematic view of the base of FIG. 1;

FIG. 3A is a cross-sectional view taken along line C1-C2 in FIG. 2;

FIG. 3B is a cross-sectional view taken along line B1-B2 in FIG. 2;

FIG. 4A is a cross-sectional view taken along line A1-A2 of FIG. 2;

FIG. 4B is an enlarged schematic view of region E of FIG. 4A;

fig. 5 is a schematic structural diagram of another foldable display device provided in an embodiment of the present invention;

fig. 6 is a schematic structural diagram of another foldable display device provided in the embodiments of the present invention;

fig. 7A is a schematic structural view of the fixing bar 205 before sliding into the sliding groove 3118;

fig. 7B is a schematic structural view after the fixing bar 205 slides into the sliding groove 3118;

FIG. 7C is an enlarged schematic view of region A of FIG. 7A;

fig. 8 is a schematic structural diagram of another foldable display device provided in the embodiments of the present invention;

fig. 9 is a schematic structural diagram of another foldable display device provided in the embodiments of the present invention;

fig. 10 is a schematic structural diagram of a foldable display device according to an embodiment of the present invention;

FIG. 11 is a schematic diagram showing a heat diffusion path of a display device according to an embodiment of the present invention;

FIG. 12 is a schematic view of a foldable display device according to an embodiment of the present invention;

fig. 13 is a schematic view of another foldable display device provided in the embodiments of the present invention.

[ detailed description ] embodiments

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this embodiment of the invention, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that although the terms first, second, etc. may be used to describe the heat dissipation assemblies in embodiments of the present invention, the heat dissipation assemblies should not be limited to these terms. These terms are only used to distinguish heat dissipation assemblies from one another. For example, a first heat dissipation assembly can also be referred to as a second heat dissipation assembly, and similarly, a second heat dissipation assembly can also be referred to as a first heat dissipation assembly without departing from the scope of embodiments of the present invention.

Fig. 1 is a schematic structural view of a foldable display device according to an embodiment of the present invention, fig. 2 is a schematic structural view of a base in fig. 1, fig. 3A is a sectional view taken along line C1-C2 in fig. 2, fig. 3B is a sectional view taken along line B1-B2 in fig. 2, fig. 4A is a sectional view taken along line a1-a2 in fig. 2, and fig. 4B is an enlarged schematic structural view of region E in fig. 4A.

As shown in fig. 1 to 4B, the foldable display device 1 includes: a bending zone 20 and a non-bending zone 10; a first heat dissipation assembly 30 located in the bending region 20; the first heat dissipation assembly 30 includes a base 301, the base 301 includes an inner cavity 3011, and at least one first opening 3012, wherein the first opening 3012 communicates with the inner cavity 3011; the fixing strip 205 is positioned in the inner cavity 3011 of the base 301, and the fixing strip 205 is rotatably connected with the base 301. As shown in fig. 4A, the fixing bar 205 may be rotatably connected to the base 301 by a screw 303, but the manner of rotatably matching the fixing bar 205 with the base 301 is not limited thereto. At least one groove 3021 is provided on the fixing strip 205; the groove 3021 communicates with the inner cavity 3011 and is used for transmitting heat of the display device to the first opening 3012, and the first opening 3012 is used for diffusing the heat transmitted to the bending region 20 to the outside of the display device.

In this application, collapsible display device includes first radiator unit, and first radiator unit is located the bending region for with the heat diffusion of bending region department, avoid the long-time gathering of heat in the bending region, influence the normal work in bending region. The first heat dissipation assembly comprises a base and a fixing strip which is rotatably connected with the base, the base comprises an inner cavity and at least one first opening, the inner cavity is a cavity with a hollow structure, the inner cavity is connected with the first opening, and the first opening is directly connected with the external environment; at least one groove is arranged on the fixing strip, wherein the groove is communicated with the inner cavity. After recess and inner chamber intercommunication, can transmit display device's heat to the first opening on the base, because first opening directly links to each other with external environment, consequently transmit to outside the display device can be derived to the heat of first opening part through first opening to the heat of gathering in buckle area department is dissipated, guarantees the normal work of buckle area department.

Alternatively, both the bending region and the non-bending region include an organic light emitting display panel 01 (as shown in fig. 6).

Further, in order to rapidly conduct the heat of the bending region, the inventor of the present application further proposes a design, as shown in fig. 5 to 6. In this embodiment, the same technical parts as those in the above embodiments are not described herein again. The technical points in this embodiment will be described below. In this embodiment, as shown in fig. 5, the display device further includes: and the second heat dissipation assembly 60 is located in the non-bending area, and the second heat dissipation assembly 60 comprises a plurality of heat pipes 204 arranged at intervals. The working principle of the heat pipe is that the heat is quickly conducted by utilizing the phase change process of medium evaporation at the hot end and condensation at the cold end (namely, the latent heat of evaporation and condensation of liquid). A typical heat pipe consists of a pipe casing, a wick and end caps. The interior of the heat pipe is pumped into a negative pressure state and filled with proper liquid, and the liquid has a low boiling point and is easy to volatilize. The tube wall has a wick that is constructed of a capillary porous material. When one end of the heat pipe is heated, the liquid in the capillary tube is quickly vaporized, the vapor flows to the other end under the power of heat diffusion, the vapor is condensed at the cold end to release heat, and the liquid flows back to the evaporation end along the porous material by the capillary action, so that the circulation is not stopped until the temperatures of the two ends of the heat pipe are equal (at the moment, the heat diffusion of the vapor is stopped). This cycle is rapid and heat can be conducted away from the heat source. That is to say, in this application embodiment, the bending region not only can dispel the heat through first radiator unit, can also dispel the heat through the heat pipe in non-bending region, has fully guaranteed the thermal quick diffusion of bending region.

Further, in order to improve the heat dissipation efficiency of the heat pipe on the non-bending region, the inventor of the present application proposes a design, as shown in fig. 5, and the same technical parts in this embodiment as those in the foregoing embodiment are not described herein again. The technical points in this embodiment will be described below. In the present embodiment, as shown in fig. 5, the heat pipe 204 has a first end 2041 on a side away from the first heat sink assembly 30; the second heat dissipation assembly further includes a heat sink 202 covering a first end of at least some of the plurality of heat pipes in a thickness direction of the heat pipes (as indicated by direction D1 in fig. 5). Optionally, the heat sink 202 and the heat pipe 204 are at least partially overlapped, that is, the heat sink 202 may be only connected to the first end 2041 of a part of the heat pipe 204, and the heat sink 202 increases the heat dissipation area of the heat pipe 204, thereby improving the heat dissipation efficiency of the heat pipe 204; meanwhile, the heat sink 202 overlaps the end 2041 of the heat pipe 204 on the side away from the first heat sink assembly 30, so that the end of the non-bending region can be a heat dissipation position in addition to the bending region on the display device, thereby increasing the heat dissipation position on the display device and improving the heat dissipation efficiency.

Optionally, the heat sink 202 includes heat dissipation fins, and the size of the heat dissipation fins and the distance between the fins may be selected according to actual needs, which is not limited herein.

Alternatively, as shown in fig. 5, in order to make the heat dissipation area large enough, the heat sink 202 covers the first ends 2041 of all the heat pipes 204.

Further, in order to quickly conduct the heat at the upper end of the non-bending region out of the display device, the inventor of the present application proposes a design, as shown in fig. 6, and the same technical parts in this embodiment as those in the foregoing embodiment are not described herein again. The technical points in this embodiment will be described below. In this embodiment, for convenience of description, fig. 6 only illustrates a structural schematic diagram of the second heat dissipation assembly located on one side of the first heat dissipation assembly. As shown in fig. 6, the second heat dissipation assembly further includes a support plate 201, where the support plate 201 is located on a side of the heat pipe 204 away from the display panel 01; a second opening 2010 is arranged on the support plate 201, and the projection of the heat sink 202 on the display panel 01 at least partially covers the projection of the second opening 2010 on the display panel 01; the second opening 2010 is used to diffuse heat transferred to the non-bending region out of the display device 1.

The supporting plate plays a role in bearing and supporting the second heat dissipation assembly, and optionally, the supporting plate is fixed with the heat sink through a screw.

In order to make the normal operation of the display panel 01 on the display device not affected by the temperature, the support plate 201 is disposed away from the display panel 01. Since the supporting plate 201 is provided with a second opening 2010 directly connected to the outside, and the second opening 2010 partially overlaps the heat sink 202, the heat on the heat sink 202 can be conducted out of the display device through the second opening 2010.

Optionally, the size of the second opening 2010 is the same as that of the heat sink 202, that is, the projection of the heat sink 202 on the display panel 01 and the projection of the second opening 2010 on the display panel 01 substantially completely overlap, in this case, the heat sink 202 may be clamped in the second opening 2010, and the heat sink 202 may partially extend from the second opening 2010 to the outside, so that the overall thickness of the second heat dissipation assembly is not affected by the size of the heat sink 202. On the other hand, since the size of the second opening 2010 is the same as that of the heat sink 202, the heat sink 202 can be mounted and dismounted from the outside of the second opening 2010, and it should be noted that the outside of the second opening 2010 refers to the side of the second opening 2010 far away from the display panel 01, so that the size and shape of the heat sink 202 are not limited, and the flexibility of the heat sink is increased.

Based on the above embodiments, further, in order to quickly conduct the heat on the display panel 01 to the heat pipe 204 and then to be led out of the display device through the structures of the heat pipe 204, the heat sink 202, and the like, the inventor of the present application further proposes a design, as shown in fig. 6, and the same technical parts in this embodiment as in the above embodiments are not described herein again. The technical points in this embodiment will be described below. In this embodiment, as shown in fig. 6, the second heat dissipation assembly further includes a copper sheet 203, where the copper sheet 203 is located on one side of the heat pipe 204 close to the display panel 01; optionally, the projection area of the copper sheet 203 on the display panel 01 is smaller than or equal to the projection area of the supporting plate 201 on the display panel 01. In this embodiment, since the copper sheet 203 has a relatively strong heat dissipation capability and high horizontal and vertical heat conductivity coefficients, heat on the display panel 01 can be quickly conducted to the heat pipe 204, thereby preventing abnormal display caused by an excessively high temperature on the display panel 01.

On the other hand, since the size of the copper sheet 203 is substantially the same as that of the supporting board 201, a relatively closed space can be formed between the copper sheet 203 and the supporting board 201, and the closed space can be used for accommodating some components of the display device, and the second heat dissipation assembly can also dissipate heat for the components.

Optionally, the copper sheet 203 is fixed to the display panel 01 by adhesive.

On the basis of the above embodiment, further, in order to perform rapid heat conduction so as to uniformly distribute heat in the display device, at least two of the heat pipe 204, the heat sink 202, the copper sheet 203 and the fixing strip 205 are fixedly connected by welding. That is, at least two of the heat pipe 204, the heat sink 202, the copper sheet 203, and the fixing bar 205 are one body.

Optionally, the heat pipe 204 is fixedly connected to the fixing bar 205 by welding. Due to the rotation fit between the fixing strip 205 and the base 301, when the heat pipe 204 and the fixing strip 205 are formed into a whole by welding, the heat pipe 204 can also rotate relative to the base 301.

Optionally, the heat pipe 204, the heat sink 202, the copper sheet 203, and the fixing strip 205 are all fixedly connected by welding, so that the second heat dissipation assembly can rotate relative to the base 301 as a whole.

In order to ensure a good rotational connection between the fixing bar 205 and the base 301, the inventor of the present application further proposes a design, as shown in fig. 7A to 7C, and the same technical parts in this embodiment as those in the above-mentioned embodiment are not described herein again. The technical points in this embodiment will be described below. In this embodiment, the base 301 includes a sliding slot 3118, and the sliding slot 3118 is used for accommodating the fixing strip 205. As can be seen from fig. 4B and 7C, the recess 3021 of the fixing strip 205 is an annular groove. And as shown in fig. 7B, after the fixing strip 205 is slid into the sliding slot 3118, a micro-cavity 3013 is formed between the groove 3021 and the sliding slot 3118. As can be seen in fig. 3A and 7B, the microcavity 3013 communicates with the internal cavity 3011. In this embodiment, the fixing bar 205 may be slid into the base 301 along the sliding slot 3118 on the base 301, so as to achieve pre-positioning, thereby ensuring that the fixing bar 205 and the base 301 finally form a good rotational connection.

Alternatively, the projection of the connection area 2042 (refer to fig. 5) of the heat pipe 204 and the fixing bar 205 on the display panel 01 substantially completely covers the projection of the spacing area between two adjacent grooves 3021 on the fixing bar 205 on the display panel 01. Such a design maximizes the microcavities while not affecting the rotation of the heat pipe.

In order to avoid the excessive heat concentration of the display panel 01 at the base 301, the inventor of the present application further proposes a design, as shown in fig. 8. In this embodiment, the same technical parts as those in the above embodiments are not described herein again. The technical points in this embodiment will be described below. In this embodiment, as shown in fig. 5 and 8, a heat insulation sheet 302 is disposed between the display panel 01 and the base 301, and when the display device is in a flat state, a projection of the heat insulation sheet 302 on the display panel 01 is adjacent to a projection of the second heat dissipation assembly 60 on the display panel. In this embodiment, the heat insulating sheet 302 is disposed below the display panel 01, so that a local overheating phenomenon is prevented, and the heat insulating sheet 302 can enable the inner cavity 3011 to have only one air outlet channel, i.e., to lead out heat from the first opening 3012.

Optionally, the sum of the projection area of the heat insulating sheet 302 on the display panel 01 and the projection area of the second heat dissipation assembly 60 on the display panel 01 is equal to the area of the display panel 01.

On the premise of ensuring that the display panel does not generate local overheating phenomenon at the base, the rotation of the heat pipe is not influenced. The heat insulating sheet 302 is designed into a lotus-root shape as shown in fig. 8, wherein the heat insulating sheet 302 includes at least a first cover portion 3116 and a second cover portion 3115, and a dimension 3116 of the first cover portion is larger than a dimension 3115 of the second cover portion 3115 in an extending direction of the heat pipe 204. The first cover portion 3116 of the heat shield 302 covers the area of the groove 3021 on the fixing bar 205, so as to prevent the display panel 01 from concentrating heat at the base 301 too much; in order not to affect the rotation of the heat pipe 204, a part of the heat insulating sheet 302 is removed above the connection position of the heat pipe 204 and the fixing bar 205 (i.e., in the direction of D1 in fig. 5) to form a second cover portion 3115, and the part of the heat insulating sheet 302 is removed to adapt to the shape of the connection position of the heat pipe 204 and the fixing bar 205, and a rotation space of the heat pipe 204 is reserved.

Based on the above embodiment, when the display panel works, heat can be quickly conducted to the edge and the middle position through the heat pipe 204, the edge heat can be dissipated through the heat sink 202, and the middle heat can be exchanged with the outside through the micro-cavity 3013 and the inner cavity 3011 and through the first opening 3012, so as to achieve the effect of reducing the temperature.

Further, based on the above embodiments, on the premise of ensuring the heat exchange between the base and the outside, in order to prevent the liquid from entering the display device, the invention further provides a design, as shown in fig. 9 and fig. 10, and the same technical parts in this embodiment as in the above embodiments are not described again. The technical points in the present embodiment will be explained below. In this embodiment, as shown in fig. 9 and 10, the base 301 further includes a baffle 304 and a waterproof and air-permeable membrane 305, the baffle includes a plurality of third openings 3113, and a projection of the waterproof and air-permeable membrane 305 on the display panel at least partially overlaps with a projection of the third openings 3113 on the display panel. In this embodiment, after the waterproof breathable film 305 is fixed on the base, air can flow into the micro-cavity 3013 through the waterproof breathable film 305, so as to exchange heat with the interior of the micro-cavity 3013, thereby achieving the effect of heat dissipation; meanwhile, the waterproof breathable film 305 can not only realize the breathable function, but also block liquid from entering the display device, so that the waterproof requirement of the product is met.

Optionally, the waterproof breathable film 305 is fixed at the third opening 3113 of the baffle 304 by a back adhesive.

Optionally, the blocking piece 304 is adhered to the base 301 by a back adhesive.

In this application, when the non-bending area of the display device is more than one, the second heat dissipation assembly can be arranged in any non-bending area. Specifically, as shown in fig. 1, the non-bending region includes a first non-bending region and a second non-bending region, and the first non-bending region and the second non-bending region are respectively located at two sides of the first heat dissipation assembly; the first non-bending area and the second non-bending area comprise a second heat dissipation assembly.

Similarly, when the display device has more than one bending area, the first heat dissipation assembly can be arranged in any one bending area.

Optionally, the included angle of the two second heat dissipation assemblies is variable in a range of 0 to 180 °.

Fig. 11 is a schematic diagram illustrating a heat diffusion path in a foldable display device when the heat dissipation structure provided in the embodiments of the present application is used. As shown in fig. 11, heat at the bent portion of the foldable display device can be released to the environment outside the display device through the first heat dissipation assembly 30 located at the bent portion, and heat at the non-bent portion can be released to the environment outside the display device through the second heat dissipation assembly 60 located at the non-bent portion. Specifically, heat generated by the display panel in the non-bending region can be uniformly conducted to each heat pipe 204 through the copper sheet 203, and the heat pipe 204 can transfer the heat to the heat sink 202 and release the heat to the environment outside the display device through the second opening 2010.

It should be noted that the schematic diagram of the heat diffusion path in fig. 11 only represents the diffusion path of most heat, and in practice, the diffusion path of a small part of heat may be different from this, for example: the heat at the bent portion of the foldable display device can be released to the environment outside the display device through the second heat dissipation assembly 60 located at the non-bent region, and the heat at the non-bent portion can be released to the environment outside the display device through the first heat dissipation assembly 30 located at the bent region. Specifically, since the conduction directions of the heat pipes are not unique, when the heat at the display panel in the non-bending region is greater than the heat at the display panel in the bending region, the heat generated by the display panel in the non-bending region can be uniformly conducted to each heat pipe 204 through the copper sheet 203, the heat pipe 204 transfers the heat to the fixing strip 205, and the heat on the fixing strip 205 enters the inner cavity 3011 from the micro cavity 3013 and is finally released to the environment outside the display device through the first opening 3012.

That is to say, the heat radiation structure that this application provided, the route of its heat conduction can change according to actual conditions, on the basis that provides multiple heat dissipation way, can carry out the self-adaptation regulation based on the radiating state of different positions for whole radiating efficiency is higher, and the radiating effect is better.

Fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present application, and fig. 13 is a schematic structural diagram of another display device according to an embodiment of the present application. The display device may be any electronic equipment with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic paper book, or a television. As described above, the display device is provided with the first heat dissipation assembly in the bending region and the second heat dissipation assembly in the non-bending region, so that heat in the display device can be effectively transferred to an environment outside the display device, and adverse effects on normal display due to heat concentration in the display device can be avoided.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A foldable display device, comprising

A bending region and a non-bending region;

the fixing strip is positioned in the inner cavity and is rotationally connected with the base; the fixing strip is provided with at least one groove;

2. The foldable display device of claim 1, wherein the display device further comprises:

and the second heat dissipation assembly is positioned in the non-bending area and comprises a plurality of heat pipes arranged at intervals.

3. The foldable display device of claim 2,

the heat pipe is provided with a first end part at one side far away from the first heat dissipation component;

the second heat dissipation assembly further comprises a heat sink covering a first end of at least some of the plurality of heat pipes in a thickness direction of the heat pipes.

4. The foldable display device of claim 3,

the bending area and the non-bending area comprise display panels;

the second heat dissipation assembly further comprises a support plate positioned on one side of the heat pipe away from the display panel;

a second opening is arranged on the supporting plate, and the projection of the radiator on the display panel at least partially covers the projection of the second opening on the display panel;

the second opening is used for diffusing the heat transmitted to the non-bending area to the outside of the display device.

5. The foldable display device of claim 4,

the second heat dissipation assembly further comprises a copper sheet, and the copper sheet is positioned on one side, close to the display panel, of the heat pipe; the projection area of the copper sheet on the display panel is equal to the projection area of the support plate on the display panel.

6. The foldable display device of claim 5,

at least two of the heat pipe, the radiator, the copper sheet and the fixing strip are fixedly connected in a welding mode.

7. The foldable display device of claim 1,

the base includes the spout, the spout is used for holding the fixed strip, the recess is the ring channel, just the recess with form the microcavity between the spout, the microcavity with the inner chamber intercommunication.

8. The foldable display device of claim 2, wherein the display device further comprises a display panel, a thermal insulating sheet is disposed between the display panel and the base,

when the display device is in a flat state, the projection of the heat insulation sheet on the display panel is adjacent to the projection of the second heat dissipation assembly on the display panel.

9. The foldable display device of claim 8, wherein a sum of a projected area of the thermal insulating sheet on the display panel and a projected area of the second heat dissipation assembly on the display panel is equal to an area of the display panel.

10. The foldable display device of claim 2,

the non-bending area comprises a first non-bending area and a second non-bending area, and the first non-bending area and the second non-bending area are respectively positioned at two sides of the first heat dissipation assembly;

the first non-bending area and the second non-bending area comprise one second heat dissipation assembly.