KR20170119344A - Back cover and display apparatus having the same - Google Patents

Abstract

A back cover for a display device, comprising: a core layer forming a core material; And a skin layer made of an Al-coated steel sheet having a plated layer of Al formed on at least one surface of the steel sheet and being laminated on both surfaces of the core layer.
The back cover of the present invention is characterized in that the skin layer laminated on both surfaces of the core layer exhibits both the rigidity of the GI steel sheet and the heat resistance, corrosion resistance and high thermal conductivity possessed by Al and is advantageous for slimming the display device, The effect can be effectively released.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back cover for a display device having high thermal conductivity and rigidity,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a back cover coupled to stably support a display panel on the back surface of a display panel.

2. Description of the Related Art Generally, a display device is a device for receiving and displaying an image signal, and includes a TV, a monitor, and the like. As means for displaying an image, an OLED (Organic Light Emitting Display) Display Device), and Plasma Display Panel (PDP).

In recent years, as the information society has developed, the demand for display devices has been increasing in various forms and gradually becoming lighter, larger and slimmer. Particularly, in the case of a display device for a large screen to be applied to a TV, there is an increasing demand for a lightweight and slimmer TV structure as well as high picture quality and high definition.

FIG. 1 is an exploded perspective view showing a conventional display device, and FIG. 2 is an enlarged cross-sectional view showing an assembling structure of a main part of the display device of FIG.

As can be seen from these drawings, the display device 10 is provided with a display panel 11 on its front surface, and the back cover 12 is assembled to support the display panel 11 , And a middle cabinet (13) is fastened along the edges thereof. At this time, the display panel 11 and the back cover 12 in the edge area are bonded to the middle cabinet 13 via the double-sided tape 14, and the display panel 11 and the back cover 12 A magnetic pad 15 for joining them can be interposed.

The display panel 11 is an image display device, and is supported by a back cover 12 to prevent damage due to impact due to a fragile impact. That is, the back cover 12 is an essential part of the display device for stably supporting the display panel 11, and should be formed of a plate having sufficient rigidity. For example, the display panel may be composed of a panel made of a high-strength resin composite material proposed by the present applicant in Korean Patent No. 10-1472340 (prior art). The back cover 12 of the prior art document has a multi-layer structure composed of a core layer 12a and a pair of skin layers 12b disposed between the core layer 12a. Here, the core layer 12a is made of resin favorable for slimming, and the skin layer 12b is made of a metal plate of an aluminum plate material (Al plate material) or a galvanized steel sheet (GI steel sheet) in consideration of thermal conductivity and rigidity. The back cover 12 of the multi-layer structure exhibits excellent rigidity as the skin layer 12b is thicker, so that the back panel 12 can stably support the display panel.

The Al plate material constituting the skin layer has an excellent thermal conductivity and shows an excellent merit in heat dissipation of the display device, but it has a disadvantage that the display panel can not be stably supported due to insufficient rigidity. In addition, the GI steel exhibits high rigidity and can support the display panel even with a small thickness, which is advantageous for slimming down the display device. However, the GI steel sheet can not efficiently emit heat generated from the display panel due to low thermal conductivity.

In recent years, in order to overcome such disadvantages, a display device has been proposed in which a sliming is implemented using a GI steel sheet as a skin layer of a back cover, and an Al plate for thermal conduction is additionally attached to one side of the back cover have. However, since the above-described display device requires addition of an Al plate, the structure is complicated, the manufacturing cost is increased, and the display is limited to a slim size.

Korean Registered Patent No. 10-1472340 (registered and display device)

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a back cover capable of exhibiting sufficient rigidity while being thin and having a high thermal conductivity at the same time, And a display device provided with the display device.

According to an aspect of the present invention, there is provided a back cover for a display device, including: a core layer forming a core; And a skin layer made of an Al-coated steel sheet having a plated layer of Al formed on at least one surface of the steel sheet and being laminated on both surfaces of the core layer.

Here, the plating layer is characterized by being an alloy layer in which Si is mixed with Al, and is formed on the steel sheet via an Fe or Mg metal layer.

Further, the steel sheet is characterized in that the steel sheet is composed of a steel sheet of any of Galvalume steel sheet, Galvanized steel sheet, EGI steel sheet and CR steel sheet.

According to another aspect of the present invention, there is provided a display device comprising: a back cover having the above-described structure; and a display panel supported on the front surface of the back cover.

The back cover of the present invention is characterized in that the skin layer laminated on both surfaces of the core layer exhibits both the rigidity of the GI steel sheet and the heat resistance, corrosion resistance and high thermal conductivity possessed by Al and is advantageous for slimming the display device, The effect can be effectively released.

1 is an exploded perspective view showing a general configuration of a display device,
2 is a cross-sectional view showing a coupling structure of a display device according to a conventional technique,
3 is an assembled cross-sectional view of a display device according to an embodiment of the present invention,
4 is an assembled cross-sectional view illustrating a display device according to another embodiment of the present invention,
5 is an enlarged sectional view showing a cross-sectional structure of a back cover according to an embodiment of the present invention, and Fig.
FIG. 6 is a perspective sectional view showing the skin layer of FIG. 5 in detail.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 and 4 are combined sectional views showing a display device according to an embodiment of the present invention.

3, a display device according to an exemplary embodiment of the present invention includes a back cover 100, a display panel 300 supported on a back cover in front of the back cover, 100 and a middle cabinet 200 coupled along the edges of the display panel 300. A middle sheet 400 may further intervene between the back cover 100 and the display panel 300 and the back cover 100 and the display panel 300 may be attached to the double- To be connected to the middle cabinet 200.

Specifically, the back cover 100 supports the display panel 300 so that the display device can be stably fixed to an external structure (not shown) such as a wall surface or a bracket. The back cover 100 has sufficient rigidity to stably support the display panel 300, and at the same time, is made of a material and structure favorable for slimming down and lightening. The detailed structure of the back cover 100 will be described later.

The display panel 300 may be an image display device that displays an image from an external signal, and may be an organic light emitting panel advantageous for slimming, for example. The display panel 300 includes a front transparent electrode layer that is divided into a plurality of pixel regions on a transparent substrate, a light emitting layer that forms an RGB light emitting region corresponding to each pixel region, and a back electrode layer that is formed on the back surface of the light emitting layer. The transparent substrate is a base for forming a light emitting structure and has a minimum thickness capable of forming a light emitting layer. In addition, the display panel 300 may include various types of image display devices such as a liquid crystal panel and a plasma panel in addition to the organic light emitting panel.

The middle cabinet 200 is interposed between the display panel 300 and the back cover 100 to form the rim of the display device while maintaining the tightness of the coupling in the edge area. The middle cabinet 200 has a rectangular frame shape corresponding to the edge shapes of the display panel 300 and the back cover 100. The back cover 100 is coupled to the rear surface of the seating rib 210 and the display panel 300 is coupled to the front surface of the cabinet 200. [ do. At this time, the back cover 100 and the display panel 300 are coupled to the seating rib 210 via the double-sided adhesive member 500, and the adhesive member 500 can be configured by various means such as double-sided tape.

The middle cabinet 200 of the present invention may be formed by injection molding a plastic resin, or may be formed by steam-molding so as to decorate the exterior gorgeously. Further, the middle cabinet 200 may be formed of a metal frame made of extruded aluminum.

The middle sheet 400 has a structure in which the back cover 100 and the display panel 300 are joined together or the heat generated in the display panel 300 is transmitted to the back cover 100 so that efficient heat is emitted. And is interposed between the back cover and the display panel 300 in the frame of the cabinet 200. The middle sheet 400 may be a magnetic pad or a double-sided adhesive foam pad for bonding the back cover 100 and the display panel 300, In order to efficiently transmit, it can be composed of a metal plate or metal mesh having high thermal conductivity such as Al.

Referring to FIG. 4, the display device according to another embodiment of the present invention is a structure in which the back cover 100 is a substitute for the middle cabinet (200 in FIG. 3), and the middle cabinet is deleted. The back cover 100 for this purpose forms a side flange 100 'which is folded upward at the body edge of the plate, and the side flange 100' forms the rim of the display device. The display panel 300 is directly coupled to the back cover 100 in the receiving space inside the side flange 100 'via the adhesive member 500 in the edge area and the middle sheet 400 is interposed .

As described above, the display device according to another embodiment of the present invention can reduce the number of components, simplify the assembling process, and reduce manufacturing cost, in place of the middle cabinet.

FIG. 5 is an enlarged cross-sectional view showing a cross-sectional structure of a back cover according to an embodiment of the present invention, and FIG. 6 is a perspective sectional view showing a skin layer as a main part of FIG.

The back cover 100 according to the embodiment of the present invention has a multi-layer structure including a core layer 110 forming an inner core and a pair of skin layers 120 forming an outer skin.

Specifically, the core layer 110 serves as a support for the back cover 100. The core layer 110 may be made of a filler material such as an inorganic compound, a fabric, or a synthetic resin, An additive, an inorganic compound additive, and the like.

Examples of the inorganic compound used as the filler material of the core layer 110 include aluminum hydroxide (Al (OH) ₃ ), magnesium hydroxide (Mg (OH) ₂ ), antimony trioxide (Sb ₂ O ₃ ) boron compound or a mixture thereof may be used. As the fiber, a fiber or fabric such as a glass fabric, a carbon fabric or a mixture thereof may be used. As the synthetic resin, bisphenol A thermosetting epoxy resin such as a -A type epoxy resin, a polyethylene resin such as a low density polyethylene (LDPE), ethylene vinyl acetate copolymer (EVA), a mixture thereof and the like can be used.

As the flame retardant auxiliary used as an additive for the core layer 110, magnesium oxide (MgO), zinc oxide (ZnO), silicon dioxide (SiO ₂ ) or the like can be used. As the inorganic compound additive, talc ), Clay, kaolin, mica, diatomaceous earth, graphite, carbon black and the like.

The core layer 110 may be formed by an extrusion molding method or a high-temperature compression molding method. When the molding is performed by an extrusion molding method, the filling material is preferably an inorganic compound. When molding by a high-temperature bonding method, And a thermosetting epoxy resin. At this time, the thickness of the core layer 110 is not particularly limited, but is usually 0.2 to 1.7 mm, preferably 0.7 to 1.7 mm.

The core layer 110 having the above-described structure may further include the thermally conductive particles 111. The thermally conductive particles are dispersed in the core of the core layer 110 to function as a filler and serve as a thermally conductive filler for improving the vertical thermal conductivity of the back cover. That is, the thermally conductive particles 111 function to improve vertical heat conduction by thermally connecting the skin layer 120, which is laminated on both surfaces of the core layer 110.

The thermally conductive particles 111 may be selected from the group consisting of Alumina, Boron Nitride, Talc, SiC, and mixtures thereof. The thermal conductivity of alumina is 33 W / mk, and the thermal conductivity of boron nitride is 55 W / mk, and the vertical thermal conductivity can be further improved by these thermally conductive particles.

In addition, the average particle size of the thermally conductive particles 111 is usually 1 to 30 μm (micron), preferably 3 to 20 μm. If the particle size of the thermally conductive particle is too small, the particles may be dispersed irregularly, and if it is too large, cracks may occur in the core layer 110.

The content of the core material is 80 to 95% by weight, preferably 80 to 90% by weight, more preferably 80 to 85% by weight, based on the total weight of the core material and the thermally conductive particles constituting the core layer 110 , The content of the thermally conductive particles is 5 to 20% by weight, preferably 10 to 20% by weight, more preferably 25 to 20% by weight. If the content of the thermally conductive particles is too small, the vertical thermal conductivity of the thermally conductive composite panel may become insufficient. If the content of the thermally conductive particles is too large (20 wt% or more) There is a possibility that the adhesive strength with the skin layer 120 is lowered. When the additive is used in the core layer 110, the content of the additive is 0 to 10% by weight, preferably 0 to 5% by weight, more preferably 0.5 to 5% by weight, based on the total weight of the core material, 3% by weight.

In addition, the core layer 110 is formed in a variety of structures so as to exhibit sufficient rigidity along with weight reduction. That is, the core layer 110 may be composed of a core material having a honeycomb structure, a corrugate structure, and an emboss structure. The core layer 110 having the above-described structure is relatively light compared to the plate structure, and exhibits high resistance to the bending property.

The skin layer 120 serves to protect the core layer 110 by being laminated on both sides of the core layer 110 and to improve the horizontal thermal conductivity of the back cover 100. Particularly, 120 is made of an aluminum-plated steel sheet on which the surface of the steel sheet is plated with aluminum.

6, the skin layer 120 constituting the back cover 100 is formed of a plated steel sheet on which a plating layer 122 is coded on one or both surfaces of the steel sheet 121 and the steel sheet 121. As shown in FIG.

Here, the steel plate 121 is composed of a GI type steel sheet such as a Galvalume steel sheet, a galvanized steel sheet, an electro galvanized iron (EGI) or a cold rolled steel (CR) And the plating layer 122 may be composed of an aluminum (Al) layer.

The Galvalume steel sheet is a galvanized steel sheet mixed with aluminum, zinc, and silicon, and exhibits excellent durability and heat resistance, and particularly excellent in corrosion resistance as compared with a galvanized steel sheet. The galvanized steel sheet is a hot-rolled steel sheet obtained by heat-treating a cold rolled steel sheet in a continuous hot-dip coating line to obtain a predetermined material, and exhibits excellent workability, high corrosion resistance, and easy surface pattern formation. EGI steel sheet is coated with zinc coating on the surface of cold-rolled steel sheet or hot-rolled steel sheet by electrodeposition method. It can maintain the material characteristics of the original plate and can alloy, compound, multilayer and thin film of plating layer and exhibits excellent corrosion resistance and processability. The CR steel sheet is a hot-rolled coil, which has a surface scale removed, is rolled up to about 0.15 to 3.2 mm, is subjected to annealing and temper rolling, and has excellent workability and weldability. The galvanized steel sheet or the CR steel sheet of the GI series has a somewhat disadvantageous thermal conductivity as compared with the aluminum steel sheet but exhibits excellent rigidity and the thermal conductivity is complemented by the plating layer 122.

The plated layer 122 may be made of Al alone or may be composed of a mixed material of Al and Si mixed with Al functioning mainly to improve the thermal conductivity of the skin layer 120 and Si being formed on the surface of the steel plate 121 And functions to improve the adhesion of Al (i.e., the plating layer). Si is preferably mixed in an amount of 2 wt% or less based on the total weight, and when the Si constituting the plating layer 122 is more than 2 wt%, the surface thermal conductivity may be deteriorated.

The plating layer 122 may be coated on the surface of the steel sheet 121 via the metal layer 123. The metal layer 123 may be formed of an Fe layer or a Mg layer. The metal layer 123 functions to improve the surface hardness of the plating layer 122. The plating layer 122 including the metal layer 123 is composed of 1 to 98% by weight of Al, 1 to 98% by weight of Fe or Mg, and 1 to 2% by weight of Si, based on the total weight. If the content of Al is less than 1 wt%, heat conduction increase efficiency may not be exhibited, and if it exceeds 98 wt%, problems such as plating layer adherence may occur. If Fe or Mg is less than 1 wt%, problems such as scratches may occur on the surface of the plating layer. If the content of Fe or Mg is more than 98 wt%, the plating effect of Al may not be exhibited.

The skin layer 120 made of an Al-coated steel sheet as described above may be laminated on both sides of the core layer 110 via a hot melting film 112 as shown in FIG.

[Experimental Example]

The physical properties and thermal conductivity of the back cover according to the embodiment of the present invention and the back cover according to the related art were compared through experiments. In the back cover according to the embodiment of the present invention, a composite material steel sheet having an Al layer plated on the surface of a galvanized steel sheet is used, and a galvanized steel sheet of a single material is used as a back cover according to the related art.

Example (Al-plated GI steel plate) Comparative Example (GI steel plate) Plating thickness (탆) 5 ~ 26 - physics
characteristic
Yield Strength (Mpa) 185 ~ 206 206 Tensile Strength (Mpa) 293 to 326 326 Elongation (%) 38 ~ 43 43 Thermal conductivity (W / mk) 70 ~ 144 68

As can be seen from the above experimental example, the back cover to which the composite material of the Al-coated GI steel sheet according to the embodiment of the present invention is applied as the skin layer is a back cover in which a GI steel sheet of a single material according to the related art is applied as a skin layer It can be seen that the thermal conductivity shows a remarkable difference of more than 2 times as much as that of 68W / mk and 144W / mk, though the thickness is almost the same and the physical properties are similar in rigidity.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

100: Back cover
110: core layer 111: thermally conductive particle
120: skin layer
121: steel plate 122: plated layer
123: metal layer

Claims (8)

A back cover for a display device supporting a display panel,
A core layer forming a core material;
And a skin layer made of an Al-plated steel sheet having a plated layer of Al formed on at least one surface of the steel sheet and being laminated on both surfaces of the core layer. The plating method according to claim 1,
Wherein the Al alloy layer is a mixture of Al and Si. The plating method according to claim 2,
Wherein the metal layer is formed on the steel sheet via an Fe or Mg metal layer. The method of claim 3,
Wherein the content of Al is 1 to 98% by weight, the content of Fe or Mg is 1 to 98% by weight, and the content of Si is 1 to 2% by weight. The steel plate according to claim 1,
A Galvanized steel plate, a Galvanized steel plate, an EGI steel plate, or a CR steel plate. A back cover comprising: a back cover comprising: a back cover; And
And a display panel disposed on the front surface of the back cover and supported by the back cover. The method according to claim 6,
And a middle cabinet coupled to the back cover along an edge of the display panel. The method according to claim 6,
And a middle sheet interposed between the back cover and the display panel.

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