Lampshade, backlight module and display device

Abstract

The present invention discloses a lampshade, a backlight module and a display device. The lampshade includes a main body, which includes a bottom wall, a top wall and side walls. The bottom wall, the top wall and the side walls together enclose a mounting cavity. The mounting cavity has a mounting opening, which is arranged opposite to the side wall. The lampshade also includes a first fin group, which includes a first heat dissipation fin and a second heat dissipation fin. The first heat dissipation fin is connected to the side of the side wall away from the mounting opening, and the first heat dissipation fin is provided with at least one first heat dissipation opening; the second heat dissipation fin is connected to the side of the side wall away from the mounting opening, and the second heat dissipation fin is provided with at least one second heat dissipation opening, which is larger than the first heat dissipation opening. The present invention provides a first heat dissipation fin and a second heat dissipation fin, and respectively provides a first heat dissipation opening and a second heat dissipation opening larger than the first heat dissipation opening. Therefore, airflow flows to the second heat dissipation opening, and the outside air is supplemented to form a heat convection phenomenon, thereby improving the heat dissipation effect.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a lampshade, a backlight module using the lampshade, and a display device using the backlight module. Background Art

[0002] The backplane in a traditional backlight module needs to consider the light loss and intensity of the light source and then design a curved lampshade. However, while meeting the first two requirements, the light source cannot effectively dissipate heat in the closed cavity, which has a great impact on the life of the light source itself. Summary of the Invention

[0003] The main purpose of the present invention is to provide a lampshade, which aims to improve the problem that the light source in the backlight module cannot effectively dissipate heat.

[0004] To achieve the above-mentioned purpose, the lampshade proposed in the present invention includes a main body, the main body includes a bottom wall, a top wall and a side wall, the bottom wall, the top wall and the side wall together enclose a mounting cavity, the mounting cavity has a mounting opening, and the mounting opening is arranged opposite to the side wall, the lampshade also includes a first fin group, the first fin group includes a first heat dissipation fin and a second heat dissipation fin, the first heat dissipation fin is connected to the side of the side wall away from the mounting opening, and the first heat dissipation fin is provided with at least one first heat dissipation opening; the second heat dissipation fin is connected to the side of the side wall away from the mounting opening, and the second heat dissipation fin is provided with at least one second heat dissipation opening, and the second heat dissipation opening is larger than the first heat dissipation opening.

[0005] In one embodiment, there are a plurality of the first heat dissipation fins, and a plurality of the second heat dissipation fins, and the plurality of the first heat dissipation fins and the plurality of the second heat dissipation fins are arranged alternately.

[0006] In one embodiment, the lampshade further includes a support plate, which is arranged on a side of the side wall away from the mounting opening and perpendicular to the side wall, and the first heat dissipating fins and the second heat dissipating fins are both connected to one side of the support plate.

[0007] In one embodiment, the plate surface of the first heat dissipating fin and the plate surface of the second heat dissipating fin are both arranged at an acute angle to the side wall, and are both connected to the side wall.

[0008] In one embodiment, the first heat dissipation opening is formed by a recessed edge of the first heat dissipation fin that is not connected to the support plate and the side wall; the second heat dissipation opening is formed by a recessed edge of the second heat dissipation fin that is not connected to the support plate and the side wall.

[0009] In one embodiment, each of the first heat dissipation fins is provided with two first heat dissipation openings, and each of the second heat dissipation fins is provided with two second heat dissipation openings.

[0010] In one embodiment, the lampshade further includes a second fin group, and the second fin group and the first fin group are symmetrically arranged with respect to the support plate.

[0011] In one embodiment, the main body, the first heat dissipating fins, the second heat dissipating fins, and the support plate are all made of copper.

[0012] The present invention also proposes a backlight module, including a back panel, a light source, a light guide plate, an optical film and the above-mentioned lampshade, wherein the lampshade is arranged on one side of the back panel and close to the edge of the back panel, the light source is arranged in the lampshade, the light guide plate is arranged on one side of the back panel and opposite to the light emitting side of the light source, and the optical film is arranged on the side of the light guide plate away from the back panel.

[0013] The present invention further provides a display device, characterized in that it comprises a display panel and the above-mentioned backlight module, wherein the display panel is arranged on a side of the optical film away from the back plate.

[0014] The technical solution of the present invention, by disposing a first fin assembly on the side of the main body facing away from the mounting opening, can conduct heat within the main body to the outside through the first fin assembly, thereby improving the heat dissipation effect. Furthermore, because the first fin assembly includes first and second heat dissipation fins, the first heat dissipation fins have a first heat dissipation opening, and the second heat dissipation fins have a second heat dissipation opening, and the second heat dissipation opening is larger than the first heat dissipation opening, as the temperature in the space between the first and second heat dissipation fins continues to rise, the air pressure in the space also continues to rise, and thus the pressure continues to rise. According to the relationship P = F / S, the second heat dissipation opening is larger than the first heat dissipation opening, and the area of ​​the second heat dissipation opening S2 is greater than the area of ​​the first heat dissipation opening S1. Therefore, the gas pressure at the first heat dissipation opening is greater than the gas pressure at the second heat dissipation opening, thereby achieving a trend of airflow toward the second heat dissipation opening. When a portion of the gas in the space flows out of the second heat dissipation opening, a negative pressure is formed. Subsequently, gas from the outside world or other spaces can be directed into the space through the first heat dissipation opening. This cycle repeatedly forms a significant thermal convection phenomenon, further improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1 This is a structural schematic diagram of an embodiment of a lampshade according to an embodiment of the present invention;

[0017] Figure 2 is a cross-sectional view of an embodiment of a backlight module according to the second embodiment of the present invention;

[0018] Figure 3 This is a cross-sectional view of a display device according to embodiment 3 of the present invention.

[0019] Description of Figure Numbers:

[0020] Label name Label name 100 lampshade 110 Main body 111 bottom wall 112 Top wall 113 sidewall 110a Installation port 120 First fin group 121 First heat sink 121a First heat dissipation opening 122 Second heat sink 122a Second heat dissipation opening 130 Support plate 140 Second fin group 200 Back panel 300 light source 400 light guide plate 500 Optical film 600 Display panel

[0021] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] The present invention provides a lampshade 100 .

[0026] In the embodiment of the present invention, Figure 1 As shown, the lampshade 100 includes a main body 110, which includes a bottom wall 111, a top wall 112 and a side wall 113. The bottom wall 111, the top wall 112 and the side wall 113 together enclose a mounting cavity, and the mounting cavity has a mounting opening 110a, which is arranged opposite to the side wall 113. The lampshade 100 also includes a first fin group 120, which includes a first heat dissipation fin 121 and a second heat dissipation fin 122. The first heat dissipation fin 121 is connected to a side of the side wall 113 away from the mounting opening 110a, and at least one first heat dissipation opening 121a is provided on the first heat dissipation fin 121; the second heat dissipation fin 122 is connected to a side of the side wall 113 away from the mounting opening 110a, and at least one second heat dissipation opening 122a is provided on the second heat dissipation fin 122, and the second heat dissipation opening 122a is larger than the first heat dissipation opening 121a.

[0027] The main body 110 of the lampshade 100 is formed with a mounting cavity, which has a mounting opening 110a. The light source 300 can be installed in the mounting cavity through the mounting opening 110a. The inner wall of the lampshade 100 can be provided with a reflector to improve the light utilization rate. It is understandable that since the mounting cavity is used to install the light source 300, the light source 300 can generate a lot of heat when working. The lampshade 100, when combined with other structures, will make it difficult for the heat emitted by the light source 300 to dissipate. In the technical solution of the present invention, a first fin group 120 is provided on the side of the side wall 113 away from the mounting opening 110a, so that the heat in the mounting cavity can be conducted to the first fin group 120 for heat dissipation. Furthermore, the first fin group 120 includes a first heat dissipation fin 121 and a second heat dissipation fin 122. The first heat dissipation fin 121 is provided with at least one first heat dissipation opening 121a, and the second heat dissipation fin 122 is provided with at least one second heat dissipation opening 122a. The opening of the second heat dissipation fin 122 is larger than the opening of the first heat dissipation fin 121, so that the hot air flow in the space between the first heat dissipation fin 121 and the second heat dissipation fin 122 and the external air flow can form a convection state through the first heat dissipation opening 121a and the second heat dissipation opening 122a, thereby improving the heat dissipation effect. Specifically, as the light source 300 generates more and more heat during operation, the air pressure in the space between the adjacent first and second heat dissipation fins 122 becomes increasingly greater. Since the second heat dissipation opening 122a is larger than the first heat dissipation opening 121a, according to P=F / S, at the local positions of the first heat dissipation opening 121a and the second heat dissipation opening 122a, the pressure at the corresponding first heat dissipation opening 121a will be greater than the pressure at the second heat dissipation opening 122a. Therefore, when the pressure rises, it first rises to the pressure value at the second heat dissipation opening 122a, and then rises to the pressure value at the first heat dissipation opening 121a. However, when the air rises to the pressure value at the second heat dissipation opening 122a, the air first flows out from the second heat dissipation opening 122a, thereby realizing the trend of air flowing to the second heat dissipation opening 122a with a larger opening. When a part of the air between the first heat dissipation fin 121 and the second heat dissipation fin 122 flows out from the second heat dissipation opening 122a, a negative pressure is formed in the space between the first heat dissipation fin 121 and the second heat dissipation fin 122, and then the air in other spaces or the outside world is supplemented by the first heat dissipation opening 121a, thereby achieving a better convection effect and improving the heat dissipation effect.

[0028] Specifically, the first fin group 120 may include a first heat dissipating fin 121 or at least two first heat dissipating fins 121, and may also include a second heat dissipating fin 122 and at least two second heat dissipating fins 122. When there are at least two first heat dissipating fins 121 and second heat dissipating fins 122, the first heat dissipating fins 121 and the second heat dissipating fins 122 may be arranged alternately, or several first heat dissipating fins 121 may be arranged at one end of the main body 110, and several second heat dissipating fins 122 may be arranged at the other end of the main body 110.

[0029] The technical solution of the present invention, by disposing a first fin assembly 120 on the side of the sidewall 113 of the main body 110 facing away from the mounting opening 110a, can conduct heat within the main body 110 to the outside through the first fin assembly 120, thereby improving the heat dissipation effect. Furthermore, because the first fin assembly 120 includes a first heat dissipation fin 121 and a second heat dissipation fin 122, the first heat dissipation fin 121 has a first heat dissipation opening 121a, and the second heat dissipation fin 122 has a second heat dissipation opening 122a, and the second heat dissipation opening 122a is larger than the first heat dissipation opening 121a, as the temperature in the space between the first heat dissipation fin 121 and the second heat dissipation fin 122 continues to rise, the air pressure in the space also continues to rise, thereby continuously increasing the pressure. According to P=F / S, the second heat dissipation opening 122a is larger than the first heat dissipation opening 121a, and the area S2 of the second heat dissipation opening 122a is greater than the area S1 of the first heat dissipation opening 121a. Therefore, the gas pressure at the first heat dissipation opening 121a is greater than the gas pressure at the second heat dissipation opening 122a, thereby achieving a trend of airflow toward the second heat dissipation opening 122a. When a portion of the gas in the space flows out from the second heat dissipation opening 122a, negative pressure is formed. Then, by allowing the gas from the outside or other spaces to flow into the space through the first heat dissipation opening 121a, this cycle can be repeated to form a significant thermal convection phenomenon, thereby further improving the heat dissipation effect.

[0030] In one example, if Figure 1 As shown, there are a plurality of first heat dissipating fins 121 and a plurality of second heat dissipating fins 122 , and the plurality of first heat dissipating fins 121 and the plurality of second heat dissipating fins 122 are arranged alternately.

[0031] Multiple first heat dissipation fins 121 and multiple second heat dissipation fins 122 are arranged alternately, which means that there is a first heat dissipation fin 121, a second heat dissipation fin 122, another first heat dissipation fin 121, another second heat dissipation fin 122... and so on, so that there is a second heat dissipation fin 122 between every two adjacent first heat dissipation fins 121, and at the same time, there is a first heat dissipation fin 121 between every two adjacent second heat dissipation fins 122.

[0032] Taking the example of a case where two first heat dissipation fins 121 and two second heat dissipation fins 122 are provided, and the fins at the head end are the first heat dissipation fins 121 and the fins at the tail end are the second heat dissipation fins 122, three cavities are formed between these fins. After the air in the cavity at the tail end is heated, the air in the cavity at the tail end will flow out through the second heat dissipation openings 122a of the second heat dissipation fins 122 at the tail end, thereby forming a negative pressure in the cavity at the tail end. Even if the gas in the middle cavity should have a tendency to flow toward the head end after being heated, because the cavity at the tail end forms a negative pressure, at this time, the negative pressure is greater than the pressure of the gas in the middle cavity flowing toward the head end, so the gas in the middle cavity will eventually have a tendency to flow toward the tail end cavity. In this cycle, the gas in all cavities will flow toward the tail end, and then be supplemented by the gas in the head end, forming a more stable convection state and achieving a better heat dissipation effect.

[0033] Furthermore, if Figure 1 As shown, the lampshade 100 further includes a support plate 130 , which is disposed on a side of the side wall 113 away from the mounting opening 110 a and perpendicular to the side wall 113 , and the first heat dissipation fins 121 and the second heat dissipation fins 122 are both connected to one side of the support plate 130 .

[0034] This arrangement allows the first heat sink 121 to connect to the side wall 113 on one side and to the support plate 130 on the other side, thereby improving the stability of the connection of the first heat sink 121, providing better thermal conductivity, and achieving better heat dissipation. Similarly, this arrangement allows the second heat sink 122 to connect to the side wall 113 on one side and to the support plate 130 on the other side, thereby improving the stability of the connection of the second heat sink 122, providing better thermal conductivity, and achieving better heat dissipation. In addition, the connection of the support plate 130 to the side wall 113 increases the heat dissipation area and improves the heat dissipation effect.

[0035] Furthermore, if Figure 1 As shown, the plate surfaces of the first heat dissipating fins 121 and the plate surfaces of the second heat dissipating fins 122 are both arranged at an acute angle to the side wall 113 and are both connected to the side wall 113 .

[0036] By arranging the surfaces of the first and second heat dissipating fins 121, 122 at an acute angle to the side wall 113, the first and second heat dissipating fins 121, 122 are inclined relative to the side wall 113, thereby increasing the heat dissipation area of ​​the first and second heat dissipating fins 121, 122 and improving the heat dissipation effect of the first and second heat dissipating fins 121, 122. It should be noted that the arrangement of the surface of the first heat dissipating fin 121 at an acute angle to the side wall 113 means that the largest surface of the first heat dissipating fin 121 is arranged at an acute angle to the side wall 113; and the arrangement of the surface of the second heat dissipating fin 122 at an acute angle to the side wall 113 means that the largest surface of the second heat dissipating fin 122 is arranged at an acute angle to the side wall 113.

[0037] Specifically, the maximum surface of the first heat sink 121 can be shaped like a triangle, rectangle, or oval. The maximum surface of the second heat sink 122 can also be shaped like a triangle, rectangle, or oval. Preferably, the maximum surface of both the first heat sink 121 and the second heat sink 122 is triangular. This arrangement makes triangular heat sinks easier to process than rectangular or oval heat sinks. Furthermore, when the lampshade 100 is mounted on a display device, it must be mated with adhesive tape and a plastic frame, which must encompass the edges of the heat sinks. By configuring the maximum surfaces of both the first heat sink 121 and the second heat sink 122 to be triangular, since their two surfaces are connected to the sidewall 113 and the support plate 130, respectively, only one surface of each heat sink needs to be processed to ensure that it is in contact with the adhesive tape and the plastic frame. In contrast, rectangular heat sinks require both surfaces of each heat sink to be in contact with the adhesive tape and the plastic frame. Furthermore, the requirements for forming a sealed space by arranging triangular fins side by side are also simpler than those for arranging rectangular fins side by side. Therefore, designing the maximum surface of the first and second fins 121, 122 to be triangular is more conducive to forming a sealed space together with the tape and the plastic frame. Furthermore, by connecting both the first and second fins 121, 122 to the side wall 113, the connection strength between the first and second fins 121, 122 is enhanced, and the heat conduction efficiency from the side wall 113 to the first and second fins 121, 122 is also improved.

[0038] Furthermore, if Figure 1 As shown, the first heat dissipation opening 121a is formed by the edge depression of the first heat dissipation fin 121 not connected to the support plate 130 and the side wall 113; the second heat dissipation opening 122a is formed by the edge depression of the second heat dissipation fin 122 not connected to the support plate 130 and the side wall 113.

[0039] Compared with the solution of opening the first heat dissipation opening 121a and the second heat dissipation opening 122a in the middle of the first heat dissipation fin 121 and the middle of the second heat dissipation fin 122 respectively, this example opens the first heat dissipation opening 121a at the edge of the first heat dissipation fin 121 and the second heat dissipation opening 122a at the edge of the second heat dissipation fin 122. Under the premise of ensuring convection, the heat dissipation effect of the first heat dissipation fin 121 and the second heat dissipation fin 122 can be better guaranteed.

[0040] Furthermore, if Figure 1 As shown, each first heat dissipation fin 121 defines two first heat dissipation openings 121 a , and each second heat dissipation fin 122 defines two second heat dissipation openings 122 a .

[0041] Compared to a solution in which only one first heat dissipation opening 121a is provided on the first heat dissipation fin 121, in this example, two first heat dissipation openings 121a are provided on the first heat dissipation fin 121, thereby increasing the heat dissipation area and achieving a better convection effect. Furthermore, the presence of two first heat dissipation openings 121a on the first heat dissipation fin 121 prevents an excessive number of first heat dissipation openings 121a, thereby preventing the heat dissipation area of ​​the first heat dissipation fin 121 from being too small, thereby ensuring a better heat dissipation effect.

[0042] Similarly, compared to a solution in which only one second heat dissipation opening 122a is provided on the second heat dissipation fin 122, in this example, two second heat dissipation openings 122a are provided on the second heat dissipation fin 122, thereby increasing the heat dissipation area and achieving a better convection effect. Furthermore, the presence of two second heat dissipation openings 122a on the second heat dissipation fin 122 prevents an excessive number of second heat dissipation openings 122a, thereby preventing the heat dissipation area of ​​the second heat dissipation fin 122 from being too small, thereby ensuring a better heat dissipation effect.

[0043] Furthermore, if Figure 1 As shown, the lampshade 100 further includes a second fin group 140 , and the second fin group 140 and the first fin group 120 are symmetrically arranged about the support plate 130 .

[0044] This arrangement further enhances the heat dissipation effect and improves space utilization, ensuring that as many heat dissipating fins as possible are present within a limited space, thereby improving heat dissipation efficiency. Furthermore, by arranging the second fin group 140 symmetrically with the first fin group 120 about the support plate 130, the heat convection effect on the opposing sides of the support plate 130 is comparable, thereby ensuring significant heat convection on the side of the entire sidewall 113 facing away from the mounting opening 110a, thereby improving the heat dissipation effect. Specifically, the second fin group 140 includes a third heat dissipating fin and a fourth heat dissipating fin. The third heat dissipating fin is symmetrically arranged with the first heat dissipating fin 121 about the support plate 130, and the fourth heat dissipating fin is symmetrically arranged with the second heat dissipating fin 122 about the support plate 130.

[0045] The lampshade 100 in the technical solution of the present invention can be a structure independent of the back plate of the backlight module, and the main body 110 , the first heat dissipation fins 121 , the second heat dissipation fins 122 and the support plate 130 are all made of copper.

[0046] Typically, the back plate of the backlight module is made of galvanized aluminum and galvanized steel, which has a low thermal conductivity. In this example, by setting the material of the main body 110, the first heat dissipation fins 121, the second heat dissipation fins 122 and the support plate 130 to copper, the thermal conductivity of the lampshade 100 is higher, thereby improving the heat dissipation efficiency.

[0047] Example 2:

[0048] The present invention also provides a backlight module, such as Figure 2 As shown, the backlight module includes a back plate 200, a light source 300, a light guide plate 400, an optical film 500 and a lampshade 100. The specific structure of the lampshade 100 refers to the above embodiment. Since the backlight module adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here. Among them, the lampshade 100 is arranged on one side of the back plate 200 and is arranged close to the edge of the back plate 200, the light source 300 is arranged in the lampshade 100, the light guide plate 400 is arranged on one side of the back plate 200 and is arranged opposite to the light output side of the light source 300, and the optical film 500 is arranged on the side of the light guide plate 400 away from the back plate 200.

[0049] The light source 300 is arranged in the lampshade 100, and the lampshade 100 is arranged on one side of the back plate 200 and close to the edge of the back plate 200. The backlight module is a side-entry backlight module. The light guide plate 400 is arranged on one side of the back plate 200 and opposite to the light emitting side of the light source 300. The optical film 500 is arranged on the side of the light guide plate 400 away from the back plate 200. The light emitted by the light source 300 passes through the light guiding effect of the light guide plate 400, making the light more divergent and emitted toward the optical film 500, thereby achieving a more uniform light output effect.

[0050] Furthermore, when the lampshade 100 is installed on the back plate 200, a recessed groove may be provided near the edge of the back plate 200, and the bottom wall 111 of the lampshade 100 may be installed in the recessed groove of the back plate 200. Buckles are provided on opposite sides of the bottom wall 111 of the lampshade 100, and the back plate 200 is provided with a slot, which is inserted into the slot so that the lampshade 100 is snap-connected to the back plate 200.

[0051] This arrangement allows the lampshade 100 to be independent of the back panel 200. When the lampshade 100 is positioned on one side of the back panel 200, the original bending process of the back panel can be eliminated, thereby avoiding the need for a bent structure of the back panel 200, thus saving the need for cutting and bending processes. Furthermore, when the lampshade 100 is positioned on the back panel 200, it can also strengthen the back panel 200.

[0052] Example 3:

[0053] The present invention also provides a display device, such as Figure 3 As shown, the display device includes a display panel 600 and a backlight module. The specific structure of the backlight module is similar to that of the above embodiments. Since the present display device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. Among them, the display panel 600 is provided on the side of the optical film 500 away from the back plate 200.

[0054] By arranging the display panel 600 on the side of the optical film 500 away from the back plate 200, the light emitted from the backlight module by the optical film 500 can be diverged onto the display panel 600, so that the user can see a display image with a certain brightness from the side of the display panel 600 away from the backlight module.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A lampshade, comprising a main body, the main body comprising a bottom wall, a top wall, and side walls, the bottom wall, the top wall, and the side walls collectively enclosing a mounting cavity, the mounting cavity having a mounting opening, the mounting opening being arranged opposite to the side walls, characterized in that: The lampshade further includes a first fin group, and the first fin group includes: a first heat dissipation fin connected to a side of the side wall facing away from the mounting opening, the first heat dissipation fin being provided with at least one first heat dissipation opening; and The second heat dissipation fin is connected to the side of the side wall away from the mounting opening. The second heat dissipation fin is provided with at least one second heat dissipation opening. The second heat dissipation opening is larger than the first heat dissipation opening and guides the hot air flow to flow in the direction from the first heat dissipation opening to the second heat dissipation opening.

2. The lampshade according to claim 1, wherein There are a plurality of the first heat dissipation fins, and a plurality of the second heat dissipation fins. The plurality of the first heat dissipation fins and the plurality of the second heat dissipation fins are arranged alternately.

3. The lampshade according to claim 1, wherein The lampshade further includes a support plate, which is arranged on a side of the side wall away from the installation opening and is perpendicular to the side wall, and the first heat dissipation fins and the second heat dissipation fins are both connected to one side of the support plate.

4. The lampshade according to claim 3, wherein The plate surface of the first heat dissipating fin and the plate surface of the second heat dissipating fin are both arranged at an acute angle to the side wall and are both connected to the side wall.

5. The lampshade according to claim 3, wherein The first heat dissipation opening is formed by a recessed edge of the first heat dissipation fin that is not connected to the support plate and the side wall; The second heat dissipation opening is formed by a recessed edge of the second heat dissipation fin that is not connected to the support plate and the side wall.

6. The lampshade according to claim 5, wherein Each of the first heat dissipation fins is provided with two first heat dissipation openings, and each of the second heat dissipation fins is provided with two second heat dissipation openings.

7. The lampshade according to claim 3, wherein: The lampshade further includes a second fin group, and the second fin group and the first fin group are symmetrically arranged with respect to the support plate.

8. The lampshade according to any one of claims 3 to 7, characterized in that: The main body, the first heat dissipation fins, the second heat dissipation fins and the support plate are all made of copper.

9. A backlight module, characterized in that: It includes a back panel, a light source, a light guide plate, an optical film and a lampshade as described in any one of claims 1 to 8, wherein the lampshade is arranged on one side of the back panel and close to the edge of the back panel, the light source is arranged in the lampshade, the light guide plate is arranged on one side of the back panel and opposite to the light output side of the light source, and the optical film is arranged on the side of the light guide plate away from the back panel.

10. A display device, characterized in that: It comprises a display panel and the backlight module as claimed in claim 9, wherein the display panel is arranged on a side of the optical film away from the back plate.

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