CN113056173B

CN113056173B - Display device

Info

Publication number: CN113056173B
Application number: CN202110276749.9A
Authority: CN
Inventors: 胡小波
Original assignee: TCL Huaxing Photoelectric Technology Co Ltd
Current assignee: TCL Huaxing Photoelectric Technology Co Ltd
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2023-02-28
Anticipated expiration: 2041-03-15
Also published as: CN113056173A

Abstract

A display device, comprising: a display screen; the cooling pipeline is arranged on one side of the display screen, and a magnetic fluid refrigerant is arranged in the cooling pipeline; the magnetic field piece is used for generating a magnetic field to drive the magnetofluid refrigerant to flow in the cooling pipeline; the cooling pipeline (magnetic fluid refrigerants are arranged in the cooling pipeline) and the magnetic field piece are installed on one side of the display screen, the magnetic field piece and the magnetic fluid refrigerants in the cooling pipeline form a dynamically opened magnetic field, and the cooling liquid in the cooling pipeline flows in a certain direction through the magnetic field, so that the heat dissipation of the display screen is accelerated.

Description

Display device

Technical Field

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

Background

The Mini-LED (Mini Light Emitting Diode) Display screen has the characteristics of high contrast, high color rendering performance and the like which are comparable to those of an OLED (Organic Light Emitting Diode) Display screen, has a slightly higher cost, is only about six-fold of the OLED, and is easier to implement compared with the OLED, so the Mini-LED becomes a layout hotspot of various large panel manufacturers.

In some Mini-LED products used outdoors, the power of a Mini-LED device needs to be increased in order to increase the brightness of a display screen, so that the display generates heat quickly, the Mini-LED device is in a high-temperature environment for a long time, the aging speed of the device is easy to accelerate, the service life of the Mini-LED product is shortened, and the display screen is unevenly cooled by the conventional cooling and radiating design.

Therefore, in the existing display device technology, the problem of uneven heat dissipation of the display screen still exists, and improvement is urgently needed.

Disclosure of Invention

The invention relates to a display device, which is used for solving the problem of uneven heat dissipation of a display screen in the prior art.

In order to solve the problems, the technical scheme provided by the invention is as follows:

the present invention provides a display device including:

a display screen;

the cooling pipeline is arranged on one side of the display screen, and a magnetic fluid refrigerant is arranged in the cooling pipeline;

and the magnetic field component is used for generating a magnetic field to drive the magnetic fluid refrigerant to flow in the cooling pipeline.

In one embodiment, the magnetic fluid coolant includes a coolant and magnetic particles disposed in the coolant.

In one embodiment, the number of magnetic particles per unit length at the corners of the cooling duct is greater than the number of magnetic particles per unit length at the non-corners of the cooling duct.

In one embodiment, the display screen includes a first region and a second region, the heat generated by the first region is greater than the heat generated by the second region, and the number of the magnetic particles in the magnetic fluid refrigerant in the cooling pipeline corresponding to the unit length of the first region is greater than the number of the magnetic particles in the magnetic fluid refrigerant in the cooling pipeline corresponding to the unit length of the second region.

In one embodiment, the magnetic field member comprises a plurality of electromagnets arranged at intervals.

In one embodiment, a plurality of the electromagnets are mounted to the cooling duct, the plurality of electromagnets being adapted to be sequentially turned on and off to generate the magnetic field.

In one embodiment, the electromagnets are arranged at equal intervals along the extension direction of the cooling duct.

In one embodiment, the cooling duct is a closed structure.

In one embodiment, the cooling duct comprises at least one closed structure.

In one embodiment, a fan is also included, the fan being mounted to the display screen and adjacent to the cooling duct.

Compared with the prior art, the display device provided by the invention has the beneficial effects that:

the present invention provides a display device including: a display screen; the cooling pipeline is arranged on one side of the display screen, and a magnetic fluid refrigerant is arranged in the cooling pipeline; and the magnetic field component is used for generating a magnetic field to drive the magnetic fluid refrigerant to flow in the cooling pipeline, so that the cooling liquid in the cooling pipeline flows, and the heat dissipation of the display screen is uniform.

Drawings

Fig. 1 is a schematic view of a first structure of a display device according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a second structure of a display device according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a third structure of the display device according to the embodiment of the invention.

Fig. 4 is a fourth structural schematic diagram of a display device according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of a fifth structure of a display device according to an embodiment of the present invention.

Fig. 6 is a sixth structural schematic diagram of a display device according to an embodiment of the present invention.

Fig. 7 is a seventh structural schematic diagram of a display device according to an embodiment of the present invention.

Fig. 8 is an eighth structural schematic diagram of a display device according to an embodiment of the present invention.

Fig. 9 is a schematic diagram of a ninth structure of the display device according to the embodiment of the present invention.

Fig. 10 is a schematic diagram of a tenth structure of a display device according to an embodiment of the present invention.

Fig. 11 is an eleventh structural diagram of a display device according to an embodiment of the present invention.

Fig. 12 is a twelfth structural schematic diagram of a display device according to an embodiment of the disclosure.

Fig. 13 is a thirteenth structural schematic diagram of the display device according to the embodiment of the invention.

Fig. 14 is a schematic diagram of a fourteenth structure of a display device according to an embodiment of the disclosure.

Fig. 15 is a fifteenth structural schematic diagram of a display device according to an embodiment of the invention.

Fig. 16 is a sixteenth structural diagram of a display device according to an embodiment of the disclosure.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The present invention provides a display device, and particularly, refer to fig. 1 to 16.

In some Mini-LED products used outdoors, in order to increase the brightness of a display screen, the power of a Mini-LED device needs to be increased, so that the display generates heat quickly, the Mini-LED device is caused to be in a high-temperature environment for a long time, the aging speed of the device is easy to accelerate, the service life of the Mini-LED product is shortened, the existing cooling and heat dissipation design is generally that the peripheral heat dissipation is quick, the middle heat dissipation is slow, the temperature in the middle of the display is obviously higher than the temperature at the edge of the display, and the integral heat dissipation of the display is uneven. Accordingly, the present invention provides a display device to solve the above problems.

Fig. 1 is a schematic view of a first structure of a display device according to an embodiment of the present invention. First, the display device 1 may be a liquid crystal display device, an OLED display device, a Mini-LED display device, or a Micro-LED display device, as can be seen from fig. 1, the display device 1 is generally a cuboid, but not limited to a cuboid, and may be in other various shapes, and eight outer corners of the display device 1 are rounded corners, so as to avoid inconvenience and even scratching of fingers when a user installs, carries or uses the display device 1.

The first direction Z is a direction perpendicular to a plane where a display surface of the display device 1 is located, the second direction X is a direction on the display surface of the display device 1 and parallel to one side of the display surface of the display device 1, and the third direction Y is a direction perpendicular to both the first direction Z and the second direction X.

Fig. 2 is a schematic view of a second structure of the display device according to the embodiment of the present invention. Which is alsobase:Sub>A cross-sectional view of the display device 1 in fig. 1 alongbase:Sub>A-base:Sub>A. As can be seen from fig. 2, the display device 1 includes: a display screen 11; a cooling pipeline 12 arranged at one side of the display screen 11, wherein a magnetic fluid refrigerant is arranged in the cooling pipeline 12; and the magnetic field piece 13 is used for generating a magnetic field to drive the magnetic fluid refrigerant to flow in the cooling pipeline 12.

The magnetic fluid refrigerant is a viscous cooling liquid containing magnetic particles, and is arranged in the cooling pipeline 12 and mainly used for accelerating heat dissipation of the display screen 11.

It can be understood that, firstly, the cooling duct 12 and the magnetic field element 13 are both disposed on a side of the display screen 11 away from the display surface, that is, on the back of the display screen 11, one is that various electric devices of the display screen 11 are all disposed on the back of the display screen 11, and disposing the cooling duct 12 on the back of the display screen 11 is more beneficial to heat dissipation of the display screen 11; secondly, the cooling pipeline 12 is arranged on the back of the display screen 11 to prevent the cooling pipeline 12 from shielding the display surface of the display screen 11, so as to avoid influencing the display visual angle of the display screen 11; furthermore, a magnetic fluid refrigerant is arranged in the cooling pipeline 12, and the magnetic fluid refrigerant can circularly move in the cooling pipeline 12 under the action of a magnetic field, so that the heat dissipation of the display screen 11 is accelerated and more uniform; the magnetic field element 13 cooperates with the magnetic fluid refrigerant in the cooling pipeline 12 to generate a magnetic field, and the magnetic fluid refrigerant flows in a certain direction according to an area of the generated magnetic field, so as to replace heat inside the display screen 11 and cool the display screen 11.

Further, the magnetic fluid refrigerant comprises cooling liquid and magnetic particles arranged in the cooling liquid.

The cooling liquid is a liquid for cooling, and has a main function of protecting the normal and good operation of the display screen 11, and circulates in the cooling pipeline 12 to achieve the effects of freezing prevention, boiling prevention, rust prevention, corrosion prevention and the like, such as an ethylene glycol-water solution and the like. Furthermore, the cooling liquid can also be an anti-freezing cooling liquid, namely the cooling liquid with an anti-freezing function can be more conveniently adapted to the environment with severe climate.

It should be noted that the diameters of the magnetic particles are smaller than the diameter of the cooling pipe 12, and preferably, the magnetic particles with small diameters but strong magnetic materials should be selected to ensure that the magnetic particles can rapidly flow in the cooling pipe 12, so as to drive the cooling liquid to rapidly flow in the cooling pipe 12; further, the diameter of the magnetic particles is preferably less than one-half of the diameter of the cooling pipe 12, so as to avoid the magnetic particles from affecting the flow of the cooling liquid in the cooling pipe 12 when the magnetic particles flow together with the cooling liquid in the cooling pipe 12.

It can be understood that the cooling liquid is used for flowing in the cooling pipeline 12, and is accelerated to the heat dissipation of the display screen 11, the magnetic particles are also arranged in the cooling pipeline 12, and are used for generating a magnetic field under the cooperation of the magnetic field piece 13, and flow along the opening and closing sequence of the magnetic field piece 13, so as to drive the cooling liquid to flow in the cooling pipeline 12, and further enable the display screen 11 to dissipate heat quickly, and play a role in cooling.

In one embodiment, the number of magnetic particles per unit length at the corners of the cooling tunnel 12 is greater than the number of magnetic particles per unit length at the non-corners of the cooling tunnel 12.

It is understood that the cooling duct 12 forms various shapes on the back of the display screen 11, when the cooling duct 12 is formed by splicing a plurality of straight lines, a corner is formed at the joint of the two spliced cooling ducts 12, and the number of the magnetic particles in the corner is greater than that in the non-corner, so as to sufficiently ensure the flow velocity of the cooling liquid in the cooling duct 12 in the corner and the flow velocity of the cooling liquid in the cooling duct 12 in the non-corner.

In another embodiment, the display screen 11 includes a first region and a second region, the heat generated by the first region is greater than the heat generated by the second region, and the number of the magnetic particles in the magnetic fluid refrigerant in the cooling pipeline 12 corresponding to the unit length of the first region is greater than the number of the magnetic particles in the magnetic fluid refrigerant in the cooling pipeline 12 corresponding to the unit length of the second region.

It can be understood that the display screen includes a first area and a second area, the heat generated by the first area is greater than the heat generated by the second area, for example, the first area is where the number of electronic components is large and concentrated, and the second area is where the number of electronic components is relatively small, after the display screen operates for a period of time, the entire display screen starts to generate heat due to continuous operation of various electronic components, and the heat generation amount in the first area is greater than the heat generation amount in the second area; in order to rapidly and uniformly cool the display screen 11, in an area with a large amount of heat generated by the display screen, the flow speed of the cooling liquid in the cooling pipeline should be increased, and therefore, in the area with a large amount of heat generated, the magnetic field strength corresponding to the cooling pipeline should be increased, that is, the number of the magnetic particles in the cooling pipeline in the area with a large amount of heat generated should be increased. The number of the magnetic particles in the magnetic fluid refrigerant in the cooling pipeline 12 in unit length corresponding to the first region is greater than the number of the magnetic particles in the magnetic fluid refrigerant in the cooling pipeline 12 in unit length corresponding to the second region, so that the flow speed of the cooling liquid at the corner of the cooling pipeline 12 can be increased, the heat dissipation speed of the region at the corner of the cooling pipeline 12 is similar to the heat dissipation speed of the region at the non-corner of the cooling pipeline 12 as much as possible, and the heat dissipation speed of the whole display screen 11 is uniform.

Further, in one embodiment, the magnetic field piece 13 includes a plurality of electromagnets arranged at intervals.

It should be noted that the magnetic field component 13 includes, but is not limited to, the electromagnet, and may also be other components capable of generating a magnetic field.

It can be understood that, when the magnetic field element 13 is the electromagnet, the number of the electromagnets includes at least two, and two adjacent electromagnets are disposed at a certain distance, for example, the adjacent electromagnets are disposed at equal intervals, or the adjacent electromagnets are disposed in an arithmetic series or an geometric series; it should be noted that when the plurality of electromagnets are arranged in an arithmetic progression or an geometric progression, the plurality of magnetic particles in the cooling duct 12 are arranged corresponding to the plurality of electromagnets, that is, when the plurality of electromagnets are arranged in an arithmetic progression, the plurality of magnetic particles are also arranged in an arithmetic progression; when the electromagnets are arranged in an equal ratio array, the magnetic particles are also arranged in an equal ratio array.

Further, a plurality of the electromagnets are installed in the cooling duct 12, and the plurality of the electromagnets are sequentially turned on and off to generate the magnetic field.

It is understood that a plurality of the electromagnets are installed on the outer wall of the cooling duct 12, spaced apart from the magnetic particles in the cooling duct 12, so that the magnetic particles form a magnetic field with the electromagnets; the electromagnets are sequentially switched on and off to generate the magnetic field; when the electro-magnet is opened in proper order, at every turn open the electro-magnet with magnetic particle forms magnetic field all around, and when a next group the electro-magnet was opened, last group the electro-magnet was closed, and a next group the electro-magnet magnetic field all around was opened, and last group the electro-magnet magnetic field all around was closed, circulates in proper order, makes a plurality ofly the opening and closing of electro-magnet go on according to certain direction, for example, the direction that magnetic field opened can be clockwise or anticlockwise, makes to be located in the cooling duct 12 magnetic particle is according to certain direction motion, and then makes in the cooling duct 12 the coolant liquid flows according to clockwise or anticlockwise, in order to accelerate in the cooling duct 12 the coolant liquid is right display screen 11's heat dissipation function.

The electromagnets which are turned on each time are in one group, and the number of the electromagnets in each group can be one or more. During each cycle, the number of the electromagnets of one group turned on each time is equal; when the number of the electromagnets in one group is one, the magnetic field generated by the electromagnets in one group is weakest; the more the number of the electromagnets in a group, the strongest the magnetic field generated by the electromagnets in a group; it should be noted that, in the cooling pipe 12 including a plurality of sections of different shapes, the number of the electromagnets in each group should be less than or equal to the number of the electromagnets disposed on the smallest section of the cooling pipe 12 in the cooling pipe 12, so as to avoid affecting the flow direction of the magnetic particles in the cooling pipe 12, and thus affecting the flow direction of the cooling liquid. For example, in fig. 3 to 6, the smallest section of the cooling pipe 12 is the section B-B, and if the number of the electromagnets arranged on the outer wall of the cooling pipe 12 in the section B-B is one, the number of the electromagnets switched on and off in each group is one; if the number of the electromagnets arranged on the outer wall of the cooling pipeline 12 in the section B-B is two, the number of the electromagnets which are turned on and off in each group is two; and so on.

Further, in the display device of the present invention, the electromagnets are disposed at equal intervals along the extending direction of the cooling duct 12.

It can be understood that, in order to fully ensure the uniformity of the heat dissipation speed of each area of the display screen 11, the electromagnets are arranged on one side of the outer wall of the cooling duct 12, and the spacing distance L between every two adjacent electromagnets is equal along the extending direction of the cooling duct 12, which is simple and convenient, and meanwhile, the situation that different numbers of the magnetic particles need to be arranged in different area ranges is avoided, as shown in fig. 10.

Further, in the embodiment provided in the present application, the cooling duct 12 is a closed structure.

It will be appreciated that the cooling ducts 12 are joined end to end, with no breaks in the cooling ducts 12 throughout. This arrangement can prevent the coolant in the cooling pipe 12 from running off to the maximum extent, so that the coolant can flow in the on and off directions of the magnetic field as long as the magnetic field is present.

Further, the cooling duct 12 comprises at least one closed structure.

It is understood that in an embodiment, the cooling pipe 12 includes a closed structure, that is, the whole cooling pipe 12 is connected end to end and disposed on one side of the display screen 11 in various shapes, in this structure design, the cooling liquid in the cooling pipe 12 has only one flow loop, and the flow direction of the cooling liquid is unique in one period, specifically, referring to fig. 3, 4, 5 and 6, the cooling pipe 12 includes one closed structure, in fig. 3, the cooling pipe 12 is in a concave shape opening in the negative direction of the second direction X, in fig. 4, the cooling pipe 12 is in a convex shape protruding in the negative direction of the second direction X, in fig. 5, the cooling pipe 12 is in an i-shape disposed in the third direction Y, and in fig. 6, the cooling pipe 12 is in a cross shape disposed in the third direction Y.

As can be further seen from fig. 3 to 6, the cooling pipes 12 are all symmetrical structures, and it can be understood that the better the symmetry of the cooling pipes 12 is, the more uniform the heat dissipation speed of each area of the display screen 11 is. In fig. 3 and 4, the axis of symmetry of the cooling duct 12 is the center line of the display screen 11 along the first direction, and further, the structure of the cooling duct 12 may also be an asymmetric structure, which is not limited to the case shown in the embodiment of the present invention.

In another embodiment, the cooling duct 12 comprises a plurality of closed structures, i.e., a plurality of "chevrons". The centers of the plurality of closed structures are the same, and refer to fig. 7, fig. 8 and fig. 9. In each closed structure, the electromagnets are controlled independently, and firstly, the magnetic fields of two adjacent closed structures can be opened simultaneously or separately; for example, fig. 7 includes three square "openings" of the enclosure structure, and the electromagnet on each enclosure structure can be controlled to be turned on and off independently; fig. 8 contains two oval "ports" of the enclosure, each of which is also individually controllable to open and close by the electromagnet; fig. 9 contains two circular "ports" of the enclosure, each of which is individually controllable to open and close by the electromagnet. Furthermore, the opening and closing directions of the electromagnets in each adjacent closed structure may be the same or different, that is, when a first closed structure opens and closes each electromagnet in sequence in a clockwise direction, a second closed structure may also open and close each electromagnet in sequence in a clockwise direction or in a counterclockwise direction, and the magnetic fields of each closed structure are controlled independently and do not affect each other; it should be noted that, when the directions of opening and closing the magnetic fields of two adjacent closed structures are different, in order to ensure that the magnetic fields of two adjacent closed structures do not interfere with each other, a certain distance needs to be separated between two adjacent closed structures; when the magnetic field directions of two adjacent closed structures are the same, in order to ensure that the circulation period of the electromagnet of the closed structure located in the central area of the display screen 11 is equal to the circulation period of the electromagnet of the closed structure located in the frame area of the display screen 11, the opening and closing speed of each electromagnet of the closed structure located in the central area of the display screen 11 is less than the opening and closing speed of each electromagnet of the closed structure located in the edge area of the display screen 11; further, when the magnetic field directions of two adjacent closed structures are the same, the circulation periods of the magnetic fields of the two adjacent closed structures may also be different, and since the magnetic field directions are the same, at this time, the requirement for the separation distance between the two adjacent closed structures is reduced, and the magnetic field in the adjacent closed structure may drive the cooling liquid in the other closed structure to flow at an accelerated speed, so as to accelerate the heat dissipation of the display screen 11.

Further, the circulation period of the magnetic field in each of the closed structures may be determined by controlling the opening and closing intervals of the two adjacent electromagnets, and when the flow speed of the cooling liquid in the cooling pipe 12 is required to be faster, the circulation period of the magnetic field in each of the closed structures is shorter, that is, the opening and closing intervals of the two adjacent electromagnets are shorter; conversely, the longer the time interval between the turning on and off of two adjacent electromagnets.

Further, in each of the closed structures, the number of the electromagnets that are simultaneously turned on and off at a time may be one or more, and the stronger the effect of the magnetic field, the faster the flow speed of the cooling liquid in the cooling pipe 12 when the number of the electromagnets that are simultaneously turned on and off is.

Further, as can be seen from fig. 11 and 12, when the cooling duct 12 is disposed in a straight line shape on one side of the display screen 11, the electromagnet disposed on the outer wall of the cooling duct 12 is rectangular in shape; as can be seen from fig. 13 and 15, when the cooling duct 12 is disposed on one side of the display screen 11 in an elliptical shape, the electromagnet disposed on the outer wall of the cooling duct 12 is shaped into a fan-shaped ring corresponding to the elliptical cooling duct 12; as can be seen from fig. 14 and 16, the cooling duct 12 is disposed in a circular shape on one side of the display panel 11, and therefore, the electromagnet disposed on the outer wall of the cooling duct 12 has a fan-shaped ring shape corresponding to the circular cooling duct 12.

Further, in an embodiment, as can be seen from fig. 13 and 14, the electromagnets on the closed structure located in the central area of the display screen 11 are disposed corresponding to the electromagnets on the closed structure located in the edge area of the display screen 11; in another embodiment, the electromagnets on the closed structure in the central area of the display screen 11 are offset from the electromagnets on the closed structure in the edge area of the display screen 11.

Further, the display device 1 further comprises a fan 14, and the fan 14 is mounted on the display screen 11 and adjacent to the cooling duct 12.

It can be understood that, like the cooling duct 12, the fan 14 is used for cooling the display screen 11, and both the fan 14 and the cooling duct 12 are disposed on the back of the display surface of the display device 1, which is more convenient for heat dissipation of electronic components disposed on the back of the display surface of the display device 1; and secondly, the visual angle range of the display surface of the display device 1 is prevented from being shielded.

The foregoing detailed description is directed to a display device provided in an embodiment of the present invention, and the principle and the embodiment of the present invention are described herein by applying specific examples, and the description of the foregoing embodiments is only for assisting understanding of the technical solutions and the core ideas of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A display device, comprising:

a display screen;

the magnetic field piece is used for generating a magnetic field to drive the magnetofluid refrigerant to flow in the cooling pipeline;

the magnetic fluid refrigerant comprises cooling liquid and magnetic particles arranged in the cooling liquid, and the number of the magnetic particles in the unit length of the corners of the cooling pipeline is larger than that of the magnetic particles in the unit length of the non-corners of the cooling pipeline.

2. The display device according to claim 1, wherein the display screen includes a first region and a second region, the first region generates more heat than the second region, and the number of the magnetic particles in the magnetic fluid refrigerant per unit length of the cooling channel corresponding to the first region is greater than the number of the magnetic particles in the magnetic fluid refrigerant per unit length of the cooling channel corresponding to the second region.

3. The display device according to claim 1, wherein the magnetic field element comprises a plurality of electromagnets arranged at intervals.

4. The display device according to claim 3, wherein a plurality of the electromagnets are installed in the cooling duct, the plurality of the electromagnets being adapted to be sequentially turned on and off to generate the magnetic field.

5. The display device according to claim 3, wherein a plurality of the electromagnets are arranged at equal intervals in an extending direction of the cooling duct.

6. The display device according to claim 1, wherein the cooling duct is a closed structure.

7. The display device according to claim 6, wherein the cooling duct has a rectangular or circular shape.

8. The display device of claim 1, further comprising a fan mounted to the display screen adjacent to the cooling duct.