KR20140091263A - Display apparatus - Google Patents

Abstract

A display apparatus according to an embodiment of the present invention comprises a display module and a heat radiation unit coupled to the rear of the display module. The heat radiation unit includes a core portion disposed to share one side with pillar of polygon to which multiple polygonal pillars extending in longitudinal direction are adjacent; a front sheet coupled to the front of the core portion; and a rear sheet coupled to the rear of the core portion.

Description

Display device {DISPLAY APPARATUS}

The present invention relates to a display device. And more particularly, to a display device improved in heat dissipation structure.

(PDP), Electro Luminescent Display (ELD), Vacuum Fluorescent Display (VFD), and the like have been developed in recent years in response to the demand for display devices. Display) have been studied and used.

Such a display device includes a display module for displaying an image, a control board for controlling the display device, and a PCB plate to which the control board is attached. In the operation of the display device, The degradation may proceed in the display module, shortening the life of the product, and lowering the reliability of the product.

Accordingly, there is a need for a structure capable of preventing heat generated from other components such as a control board from being transmitted to the display module, and diffusing heat generated in the display module.

The present invention provides a display device capable of effectively diffusing heat generated from a display module and preventing heat generated from a component located behind the display module from being transmitted to the display module.

A display device according to an embodiment of the present invention is a display device including a display module and a heat dissipation part coupled to the rear of the display module, wherein the heat dissipation part has a plurality of polygonal columns extending in the front- A core portion that is disposed to share one side surface with the other; A front seat coupled to the front of the core portion; And a rear seat coupled to a rear portion of the core portion.

The core portion may have the shape of a hexagonal column extending in the front-rear direction.

At least one of the front seat and the rear seat may be made of a material having excellent thermal conductivity.

At least one of the front seat and the rear seat may be a metallic material.

The back seat may have a greater thickness in the front-back direction than the front seat.

The value obtained by dividing the thickness of the core portion by the thickness of the heat dissipating portion may be 0.4 or more and 0.6 or less.

The display module may include a display panel and a back cover attached to a rear surface of the display panel, wherein the display panel may be an OLED panel.

A display device according to an embodiment of the present invention includes: a PCB plate coupled to a rear portion of the heat dissipation unit; And a rear cover coupled to the rear of the PCB plate and surrounding at least a part of the PCB plate.

According to the present invention, it is possible to effectively dissipate heat without increasing the volume and thickness, thereby improving the reliability of the product. Particularly, the heat generated from the display module is diffused and the heat generated from the components such as the control board located behind the display module is prevented from being transmitted to the display module, thereby preventing deterioration of the product and extending the life of the product, Can be improved.

1 is a perspective view showing a part of a display device according to one embodiment of the present invention as viewed from the rear.
2 is an exploded perspective view of a display device according to an embodiment of the present invention.
3 is a cross-sectional perspective view showing a section taken along line AA in FIG. 1;
FIG. 4 is a view showing a state in which the mid cabinet is removed in FIG. 3. FIG.
5 is a side cross-sectional view showing an example of an outer end portion of the heat dissipating portion.
6 is a side cross-sectional view showing another example of the outer end portion of the heat dissipating portion.
7 is a cross-sectional view of a part of a polygonal column constituting the core of the heat dissipation part.
FIG. 8A is a diagram for schematically showing a portion where a heat source is located in a simulation, and FIG. 8B is a diagram showing a portion for measuring temperature in a front seat during a simulation.
9 is a diagram showing the surface temperature distribution of the front seat by the simulation.
10 is a view schematically showing a heat dissipation unit.

Hereinafter, an embodiment of a display device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view of a part of a display device obliquely viewed from the rear, FIG. 2 is an exploded perspective view of a display device according to an embodiment of the present invention, FIG. 3 is a cross- FIG. 4 is a view showing a state in which the mid cabinet is removed in FIG. 3. FIG.

1 to 4, a display device according to an exemplary embodiment of the present invention includes a display module 10 as a part for displaying an image, a heat radiating part 40 coupled to the rear of the display module 10, A mid cabinet 30 provided outside the edges of the display module 10 and the heat dissipating unit 40, a PCB plate 50 coupled to the rear of the heat dissipating unit 40, And a rear cover 60 which is coupled to the rear of the rear cover 60.

First, the display module 10 includes a display panel 11 and a back cover 12 coupled to the back surface of the display panel 11.

Here, the display panel 11 may be an OLED panel that displays an image using an organic light emitting device (OLED).

Organic light emitting devices (OLEDs) have a structure in which an organic light emitting layer in the form of a functional thin film is inserted between an anode electrode and a cathode electrode. The holes are injected from the anode and electrons are injected from the cathode. The excitons are formed by bonding holes, and the excitons emit light while recombining light.

As a method of implementing a full color organic light emitting display, there are an independent light emitting method, a color filter method, and a color conversion method. In the independent light emission method, R, G, and B are implemented by performing thermal deposition using a metal shadow mask in which light emitting materials of R, G, and B are precisely patterned. In the color filter method, R, G, and B are implemented by forming a white light emitting layer and patterning R, G, and B color filters. In the color conversion method, R, G, and B are implemented using a color conversion layer in which a blue light emitting layer is formed and a blue color is changed to green and red.

The back cover 12 is a plate-shaped member that is coupled to the rear of the display panel 11 and is made of a material capable of maintaining a certain level of strength or higher even with a small thickness. For example, CFRP (Carbon Fiber- Plastic).

In the present embodiment, a display module including an OLED panel is described as an example of the display module 10, but a display module 10 applicable to the present invention may be applied to a display module 10 including an OLED panel The present invention is not limited thereto and may be applied to various other types of display modules 10 including a liquid crystal display device (LCD), a plasma display panel (Plasma Display Panel), a field emission display (FED) It is also possible.

A heat dissipating unit 40 is coupled to the rear of the display module 10. The heat dissipation unit 40 is attached to the back surface of the display module 10 by an adhesive layer 20 where the adhesive layer 20 is a member having an adhesive force to both the front surface and the back surface, .

The heat dissipating unit 40 includes a core unit 41, a front sheet 42 coupled to the front of the core unit 41, And a rear seat 43 which is coupled to the rear of the rear seat 41. The core portion 41 of the heat dissipating portion 40 has a shape in which a plurality of hollow polygonal columns extending in the front-rear direction are coupled to each other as shown in a part of a cross section in Fig. Therefore, when the core portion 41 is viewed from the front or the rear side, several polygons have a shape in which one side contacts one side or is shared and arranged.

That is, the core portion 41 includes a plurality of polygonal columns, and one of the polygonal columns has a structure in which the other polygonal column and one side are in contact with each other or one side is mutually shared .

Hereinafter, the hexagonal column will be described as an example of the polygonal column. However, it is to be understood that the polygonal column forming the core portion of the heat-radiating portion according to the present invention is not necessarily limited to a hexagonal column, and that various types of polygonal columns such as a triangular column or a quadrangular column may be used.

For example, when a polygonal column is a hexagonal column, any one of the six sides constituting the hexagonal column may be regarded as being tangent to one side of the adjacent hexagonal column, and any one hexagonal column may be adjacent to the hexagonal column It can also be viewed as sharing one aspect.

For example, in FIG. 7, if the thickness of the side surface of the hexagonal column is H _t , it can be considered that any one hexagonal column shares the side surface with the adjacent hexagonal column. If the lateral thickness of the hexagonal column is H _t / It can be interpreted that one side of one hexagonal column is in contact with one side of the adjacent hexagonal column and is integrally joined.

When the front sheet 42 and the rear sheet 43 are made of a material having excellent thermal conductivity, the heat diffusion effect can be obtained. Can be obtained simultaneously. In addition, it is light in weight and has excellent strength against an external force in the longitudinal direction.

Meanwhile, since the core portion 41 of the heat dissipating portion 40 has the shape of a polygonal column including a hexagonal column as described above, it is difficult for the cross-section of the edge to be cleanly aligned when cut according to the product size in the manufacturing process . Therefore, it is necessary to finish the edge portion of the heat dissipating portion 40 cleanly.

5 and 6 are side cross-sectional views showing an example in which the edges of the heat dissipating unit 40 are finished. The finishing process of the heat radiating portion 40 should be such that the side edge of the core portion 41 can be neatly processed and the mid cabinet accommodating portion 70 (see FIG. 4) in which a part of the mid cabinet 30, Should be able to form. The mid cabinet accommodating portion 70 is provided between the edge of the display module 10 and the edge of the heat radiating portion 40. That is, behind the mid-cabinet accommodating portion 70 and in front of the heat-radiating portion 40.

The edge portion of the heat dissipation unit 40 is stepped backward and the mid cabinet accommodating unit 70 is provided in front of a stepped portion formed rearward. That is, the heat radiating part 40 is formed to be thinner in the fore and aft direction at the edge, and the mid cabinet accommodating part 70 is provided in front of the part where the front and rear direction thicknesses are thinner.

5, the length of the core portion 41 is shorter than the lengths of the front seat 42 and the rear seat 43. As shown in Fig. That is, the end portion of the core portion 41 is positioned further inside than the end portions of the front sheet 42 and the rear sheet 43. The front sheet 42 has a first bent portion 421 bent and extended from the end portion of the core portion 41 at a substantially right angle toward the rear and a second bent portion 421 extending from the rear end of the first bent portion 421 And a second bent portion 422 bent and extending outward at a substantially right angle. The second bent portion 422 extends parallel to the rear seat 43 and the rear edge of the second bent portion 422 and the front edge of the rear seat 43 can be tangent to each other.

At this time, the space between the second bent portion 422 of the front seat 42 and the display module 10 forms a mid cabinet receiving portion 70 as shown in FIG. The mid cabinet accommodating portion 70 is a space into which the insertion portion 32 of the mid cabinet 30 described later is inserted.

That is, the heat dissipating unit 40 is formed to be stepped from the outer side to the rear side of the end of the core unit 41. The thickness of the stepped portion is reduced in the front-rear direction, and the stepped space is formed in the mid- .

6 is a side cross-sectional view showing another example of finishing the edge portion of the heat radiation portion 40. As shown in Fig. 6, the front seat 42 extends a little longer than the core portion 41, and the rear seat 43 extends longer than the front seat 42. As shown in Fig. Therefore, the core portion 41 is the shortest, the rear seat 43 is the longest, and the front seat 42 has the length between the core portion 41 and the rear seat 43. In such a structure, an end block 44 is fitted between the front seat 42 and the rear seat 43.

The end block 44 includes a medial portion 441 and a lateral portion 442. The inner side portion 441 of the end block 44 is a portion having a relatively thick thickness in the forward and backward direction and the outer side portion 442 is located further outward than the inner side portion 441 and is relatively inferior to the inner side portion 441 And has a small thickness in the back and forth direction. At this time, the rear surface of the inner portion 441 and the rear surface of the outer portion 442 are positioned on substantially the same plane, and the front surface is stepped backward from the outer portion 442 side. And the front side space of the stepped outer side portion 442 forms the mid cabinet receiving portion 70. [

The length of the front sheet 42 extending from one of the edges of the core portion 41 to the outside is L1 and the length of the back sheet 43 extending further outward from the core portion 41 is L2 The length of the inside portion 441 of the end block 44 is L1 and the length of the outside portion 442 is L2-L1.

Meanwhile, the mid cabinet 30 is coupled to the outer edge of the display module 10 and the heat dissipating unit 40 having the above-described structure. The mid cabinet 30 may have a substantially "C" shape to engage with the upper end, the left end, and the right end of the display module 10 and the heat dissipating portion 40 as shown in Fig. However, in addition to this, it is also possible to have a substantially " As shown in FIG. 3, the mid cabinet 30 includes a frame portion 31 extending in the front-rear direction and an insertion portion 32 projecting inward from the frame portion 31. The rear edge of the rim portion 31 extends to the rear or back of the rear seat 43 of the heat dissipating unit 40 and the front end of the rim extends to the front surface of the display panel 11 A little more forward. The insertion portion 32 protrudes and extends inward from a center point of the rim portion 31. The width of the insertion portion 32 in the front-rear direction is substantially the same as the width between the display module 10 and the second bent portion 422 of the front seat 42. That is, the front-rear width of the insertion portion 32 is substantially the same as the front-rear width of the mid-cabinet accommodating portion 70. This is because the insertion portion 32 is inserted into the mid cabinet accommodating portion 70 which is a space between the display module 10 and the second bent portion 422 of the front seat 42.

6, the mid cabinet accommodating portion 70 is formed between the display module 10 and the outer side portion 442 of the end block 44. [0050] However, when the heat dissipating portion 40 is finished as shown in FIG. 6, The thickness of the insertion portion 32 in the front-rear direction is substantially equal to the distance between the display module 10 and the outer portion 442.

In the case where the core of the heat dissipation unit 40 is formed of several hollow hexagonal columns, the heat dissipation performance may vary depending on the length of one side of the hexagonal cross section of the hexagonal column and the ratio of the thickness of one side, The heat dissipation performance may vary depending on the thickness of the core portion 41 constituting the heat dissipation portion 40 and the ratio of the thickness of the front sheet 42 and the thickness of the rear sheet 43. The relationship between the size of the heat dissipation portion 40 and the heat radiation performance Will be described in detail later.

A PCB plate 50 is coupled to the rear surface of the heat dissipating unit 40. A control board (not shown) having various functions can be coupled to the PCB plate 50. For example, a power supply unit for converting a driving power source for driving the display module 10, a main control board for generating a video signal for driving the display module 10, and a timing controller ) May be combined.

The rear cover 60 is disposed behind the PCB 50 and protects the PCB 50 and the control board coupled thereto. Therefore, the rear cover 60 is further protruded forward and downward, and a space for the control board and the like coupled to the PCB 50 is located therebetween. The rear end of the rear cover 60 is in contact with the rear surface of the heat dissipating unit 40. However, it may be in contact with the backside of the PCB plate 50.

Hereinafter, the relationship between the size of the heat radiation portion 40 and the heat radiation performance will be described with reference to FIGS. 7 to 10. FIG. Here, the core 41 has a honeycomb structure having a hexagonal cross-section as shown in FIG.

If the width of one side of the hexagonal cross section of the core portion 41 is denoted by H _t and the average length of one side is denoted by H _l , β which is a ratio of H _t to H _l can be expressed by the following equation.

For reference, in the above relationship, when H _t is fixed and H _l is increased, β is decreased, the heat insulating effect is increased but the stiffness is weakened, the size of the core portion 41 is increased, and appearance is poor. On the other hand, when H _t is fixed and H _l is decreased, β increases and the stiffness increases but the adiabatic effect decreases. On the other hand, when H _l is fixed and H _t is increased, β increases and the adiabatic effect decreases. On the other hand, when H _l is fixed and H _t is made small, the stiffness can be weakened as β decreases and the wall thickness becomes thin, but the adiabatic effect increases. That is, since the adiabatic effect is increased when the value of? Is small, it is preferable that the stiffness can be increased while minimizing the? Value in consideration of the size of the core portion 41 and the wall thickness.

The reason why the heat radiating portion 40 has the heat insulating performance is the influence of an air pocket provided inside the core portion 41. For reference, the coefficient of thermal conductivity of air is about 0.026 W / mK. The theoretical heat insulation limit of the heat dissipating portion 40 can not exceed the heat conduction coefficient of air. The heat transfer coefficient of the heat dissipating unit 40 according to the value of? is shown in the following table. Table 1 below shows a case in which the material of the core portion 41 is aluminum (Al) having a thermal conductivity coefficient of 150 W / mK.

beta value Ht [mm] Hl [mm] Heat transfer coefficient [W / mK] 0.02 0.08 4 3.4441 0.05 0.2 4 8.5352

In the case of aluminum (Al), the non-rigidity can be increased by reducing the weight, and when the value of β is 0.02 to 0.05, optimum heat transfer performance can be obtained.

On the other hand, when the core 41 is made of the same material as that of the front seat 42 and the rear seat 43, deformation due to a difference in thermal expansion coefficient can be prevented. For example, when the core portion 41, the front sheet 42, and the rear sheet 43 are made of aluminum (Al), deformation due to the difference in thermal expansion coefficient can be prevented.

FIG. 8A is a diagram for schematically showing a portion where a heat source is located in a simulation, and FIG. 8B is a diagram showing a portion for measuring temperature in a front seat during a simulation.

In the three cases in which the thicknesses of the front sheet 42, the core portion 41 and the rear sheet 43 are set to be different from each other, the temperature of each point of the front sheet 42 Respectively.

In more detail the simulation conditions, the first sample size constituting the heat radiating portion 40 is 100 ㅧ 100mm ^2, the thickness of the core portion 41 has a front seat 42 and rear seat 43 to 2.7mm And the thickness of the film was varied. The heat source area is 14 ㅧ 18mm ² , and the input power has a heating value of about 5W. 3.7005mm H _l, H _t is the thermal conductivity was calculated to 0.06mm, the thermal conductivity of the calculated x-direction Kx = 1.292 W / mK, y thermal conductivity of the thermal conductivity in the direction Ky = 1.292 W / mK, z directions of the Kz = 2.592 W / mK was applied. The material of the Al50 series was a metal with a thermal conductivity of Kl = 138 W / mK.

Table 2 shows the thicknesses of the front seat 42, the core portion 41, and the rear seat 43 in the three cases of Case 1, Case 2 and Case 3.

Case1 Case2 Case3 Front seat [mm] 0.8 0.2 0.2 Core section [mm] 2.7 2.7 2.7 Rear seat [mm] 0.2 0.8 0.2

Table 3 below shows the simulation results.

Case 1 Case 2 Case 3 T source 52.2177 50.5565 54.3681 T1 48.9928 49.6037 51.5236 T2 46.3873 46.8215 45.5373 T3 47.1202 47.5927 46.8424 T4 46.3419 46.7799 45.3718

Table 3 shows the maximum temperature difference of 2.65 ° C (T1 and T4), 2.82 ° C (T1 and T4), and 6.15 ° C (T1 and T4) for case 1, case 2 and case 3, respectively. In Case 1 and Case 2, it can be seen that the temperature difference is relatively small between the respective points T1 to T4, and that in Case 3, the temperature difference is relatively large.

Figures 9A, 9B and 9C show the results of this simulation. More specifically, when there is a heat source on the rear side of the rear seat 43, the surface temperature distribution result on the front seat 42 is shown. FIG. 9A shows the case 1, FIG. 9B shows the case 2, and FIG. 9C shows the case 3.

In Case 1 and Case 2, the diffusion performance of the surface temperature is relatively good. On the other hand, in Case 3, the temperature of the central portion is high because the thermal diffusion is not performed properly. In Case 3, the thermal diffusivity is low. Therefore, it can be seen that as the thickness of the front seat 42 or the rear seat 43 is increased, the heat dissipation performance is superior.

It is also understood that, when the thickness of the rear sheet 43 is increased, the effect of increasing the thermal diffusivity is obtained. The temperature deviations in T1 to T4 are not significantly different between Case 1 and Case 2. However, the temperature in the heat source is relatively lower for case 2. Therefore, it is more effective to make the thickness of the rear seat 43 relatively thick as in Case 2 than to make the thickness of the front seat 42 thick.

Further, since other parts such as the PCB plate 50 can be joined to the rear seat 43, it is also advantageous in terms of product durability that the rear seat 43 is made thicker.

10, the optimum combination ratio of the core portion 41, the front seat 42, and the rear seat 43 will be examined.

10 is a diagram schematically showing the heat dissipating unit 40. As shown in Fig. The planar direction of the heat radiating portion 40, that is, when the heat transfer coefficient as referred to the heat transfer coefficient of the vertical and horizontal directions K _v, and a thickness direction, that is, the front-rear direction K _h d, K _v is a good larger, K _h is smaller The better.

The larger the K _v , the better the thermal diffusivity. The smaller the K _h , the better the insulation performance. The better the heat dissipation in the thickness direction (front and rear direction) and the better the thermal diffusivity in the planar direction (up and down direction).

Table 4 below shows the correlation between the thickness of the core portion 41 with respect to the thickness of the entire heat dissipating portion 40 and the thermal diffusivity which is a value of Kh against Kv.

Core part thickness / Heat dissipation part thickness K _v / K _h 0.1 4.74 0.2 8.78 0.3 9.68 0.4 10.9 0.5 11.27 0.6 10.80 0.7 9.49 0.8 7.33 0.9 4.36

The larger the value of Kv / Kh, the better the heat dissipation performance.

As shown in Table 4, when the thickness of the core portion 41 / the thickness of the heat dissipation portion 40 is 0.4 to 0.6, the value of Kv / Kh is higher than 10 and is high.

Therefore, it can be seen that when the thickness of the core portion 41 accounts for about 40% to 60% of the total thickness of the heat dissipating portion 40, the heat dissipating performance is excellent.

In the display device according to the embodiment of the present invention, the display module 10 including the display panel 11 can effectively dissipate heat, It is possible to prevent heat from being transmitted from the rear PCB plate side to the display module 10 side.

10: Display module 11: Display panel
12: back cover 20: adhesive layer
30: a mid cabinet 31: a rim
32: insertion part 40:
41: core part 42: front sheet
43: rear seat 44: end block
441: medial portion 442:
50: PCB plate 60: Rear cover
70: mid cabinet accommodating portion

Claims (8)

A display device comprising: a display module; and a heat dissipation unit coupled to the rear of the display module,
The heat-
A core portion in which a plurality of polygonal columns extending in the front-rear direction share one side surface of the adjacent polygonal columns;
A front seat coupled to the front of the core portion; And
And a rear seat coupled to the rear of the core portion
Display device.
3. The method of claim 2,
The core portion
The shape of the hexagonal column extending in the longitudinal direction
Display device.
3. The method according to claim 1 or 2,
Wherein at least one of the front sheet and the back sheet is made of a material having excellent thermal conductivity
Display device.
The method of claim 3,
Wherein at least one of the front seat and the rear seat is made of a metal material
Display device.
3. The method according to claim 1 or 2,
The rear seat is thicker in the fore-and-aft direction than the front seat
Display device.
3. The method according to claim 1 or 2,
The value obtained by dividing the thickness of the core portion by the thickness of the heat dissipating portion is 0.4 or more and 0.6 or less
Display device.
The method according to claim 1,
The display module includes:
A display panel; and a back cover attached to a back surface of the display panel,
The display panel is an OLED panel
Display device.
The method according to claim 1,
A PCB plate coupled to the rear of the heat dissipation unit;
And a rear cover coupled to the rear of the PCB plate and surrounding at least a portion of the PCB plate
Display device.

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