KR101802069B1 - Reflective element having the funtion for radiating heat and preventing oxidation - Google Patents

Abstract

The present invention relates to a reflective member having oxidation prevention/heat radiation function, and an increased reflective efficiency. According to one embodiment of the present invention, the reflective member comprises: a transparent base layer; a reflective layer formed by depositing a metal on one surface of the transparent base layer; an oxidation prevention/heat radiation layer formed by depositing a different metal from the metal forming the reflective layer on a surface facing the surface of the transparent base layer side of the reflective layer; an adhesive layer formed on the surface facing the reflective layer side surface of the oxidation prevention/heat radiation layer, and reflecting light penetrating the reflective layer and the oxidation prevention/heat radiation layer towards the reflective layer and the oxidation prevention/heat radiation layer again; and a white base layer attached to the adhesive layer and reflecting light penetrating the adhesive layer towards the adhesive layer again. According to the present invention, the oxidation prevention/heat radiation layer is included, thus being able to prevent oxidation of the reflective layer and effectively radiate heat generated from the reflective layer. Moreover, the adhesive layer and the white base layer to reflect the light penetrating the reflective layer and the oxidation prevention/heat radiation layer again are included, thus being able to increase a reflective efficiency of the reflective member.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a reflective member having oxidation preventing function and heat dissipating function,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a reflection member having an oxidation prevention function and a heat radiation function, and more particularly, to a reflection member having an oxidation prevention function and a heat radiation function.

A backlight unit (BLU) is a device that supplies light from the back of a liquid crystal display (LCD).

1 is a sectional view showing a conventional edge type backlight unit.

1, an edge type backlight unit 10 generally includes a light source 11 for supplying light of a visible light ray from the side of a backlight unit 10, a light source 11 for emitting light from the light source 11, A reflective sheet 13 positioned on the rear surface of the light guide plate 12 and reflecting light in the direction of the liquid crystal display device and a backlight unit 10 And a plurality of sheets including a diffusion sheet 15, a prism sheet 16, and the like.

The reflective sheet 13 reflects light that is emitted from the back surface of the light guide plate 12, that is, in a direction opposite to the liquid crystal display device, thereby preventing loss of light supplied from the light source. The reflection sheet 13 is provided to increase the brightness of light emitted from the backlight unit 10 toward the liquid crystal display device and conventionally includes metal particles in the reflection layer of the reflection sheet 13, Techniques for increasing the reflection efficiency have been known (see prior art document 1).

The heat radiation sheet 14 positioned on the rear surface of the reflective sheet 13 serves to dissipate heat to the outside of the backlight unit 10 so that heat emitted from the light source 11 or the like is not held in the backlight unit 10. [ The backlight unit 10 includes the heat-radiating sheet 14, thereby preventing deterioration of many components in the backlight unit 10. [

However, according to the conventional backlight unit 10 as shown in FIG. 1, a plurality of reflective sheets 13 and heat-radiating sheets 14 must be provided, and manufacturing costs are increased due to the addition of parts exist. There is an increasing need for techniques that can improve the reflection efficiency and solve these limitations.

In addition, when the reflective sheet 13 is produced using only an ordinary polymer resin adhesive, there is a difference in heat shrinkage between the polymer base layer and the adhesive layer of the reflective sheet 13, and a difference in thermal deformation between the polymer base layer and the adhesive layer A curl of the reflective sheet 13 is generated. When curling occurs in the reflective sheet 13, uniform reflection of light on the reflective sheet 13 is not possible, resulting in distortion of the image of the liquid crystal display device.

1. Korean Patent Registration No. 10-0829693 (name of the invention: a reflective sheet and a backlight unit using the same and a liquid crystal display device using the same)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems as described above, and it is an object of the present invention to provide a method and apparatus for preventing oxidation of a reflective layer formed of a metal, effectively releasing heat generated therein, Thereby providing a reflective member.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a reflective member comprising: a transparent substrate layer; A reflective layer formed by laminating a metal on one surface of the transparent substrate layer; An antioxidant heat-releasing layer formed by stacking a metal and a metal forming the reflective layer on a surface of the reflective layer opposite to the surface facing the transparent substrate layer; An adhesive layer formed on a surface of the antioxidation heat-dissipating layer facing the surface facing the reflective layer, the adhesive layer being configured to reflect the light transmitted through the reflective layer and the antioxidation layer in the direction of the reflective layer and the antioxidant layer; And a white base layer attached to the adhesive layer and configured to reflect the light transmitted through the adhesive layer in the direction of the adhesive layer; .

According to another aspect of the present invention, the reflective layer is formed of silver (Ag), and the antioxidant layer is formed of at least one of copper (Cu), aluminum (Al), nickel (Ni), chromium (Cr) ), Tin (Sn), zinc (Zn), gold (Au), and platinum (Pt).

According to another aspect of the present invention, the adhesive layer may comprise a white pigment.

According to another aspect of the present invention, the white pigment may be any one or a mixture of two or more of aluminum oxide, titanium oxide, and zinc oxide.

According to the reflective member of the present invention, oxidation of the reflective layer can be prevented by including the anti-oxidation heat-radiating layer, and the heat generated in the reflective layer can be effectively emitted. Further, by including the adhesive layer and the white base layer that reflects the light passing through the reflection layer and the anti-oxidation and radiation layer, the reflection efficiency of the reflection member can be increased.

1 is a schematic cross-sectional view of a conventional edge type backlight unit.
2 is a schematic cross-sectional view of a reflective member according to an embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view showing a state where light is reflected by the reflection member of FIG. 2. FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

It is to be understood that elements or layers are referred to as being "on " other elements or layers, including both intervening layers or other elements directly on or in between.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

Like reference numerals refer to like elements throughout the specification.

The sizes and thicknesses of the individual components shown in the figures are shown for convenience of explanation and the present invention is not necessarily limited to the size and thickness of the components shown.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other partially or entirely and technically various interlocking and driving is possible as will be appreciated by those skilled in the art, It may be possible to cooperate with each other in association.

Hereinafter, the reflective member according to the present invention will be described in detail with reference to the accompanying drawings.

The reflective member 100 of the present invention is a composite film member that reflects light incident on the reflective member 100 again to change the path of light. The reflective member 100 of the present invention may be disposed on the lower surface of the light guide plate included in the backlight unit and reflect the light transmitted through the light guide plate toward the light guide plate.

However, this arrangement and function are merely examples in which the reflecting member 100 of the present invention is used, and the reflecting member 100 of the present invention is a member that is disposed at various positions of a known optical device and changes the path of light Of course.

FIG. 2 is a schematic cross-sectional view of a reflective member 100 according to an embodiment of the present invention, and FIG. 3 is a schematic cross-sectional view illustrating a reflection of light in the reflective member 100 of FIG.

Referring to FIG. 2, the reflective member 100 includes a transparent substrate layer 110, a reflective layer 120, an anti-oxidation layer 130, an adhesive layer 140, and a white substrate layer 140.

The transparent substrate layer 110 is a member of an optical transparent material providing a surface on which the reflective layer 120 to be described later is formed and providing a supporting force to the reflective member 100 of the present invention.

The transparent base layer 110 transmits incident light. It is preferable that the transparent base material layer 110 be formed such that the visible light transmittance of the transparent base material layer 110 is 70% or more, preferably 80% or more, and more preferably 90% or more.

The transparent base layer 110 is preferably formed of polyethylene terephthalate (PET) having such light transmittance and excellent in strength, heat resistance, and abrasion resistance. In addition, the transparent substrate layer 110 may be formed of a material selected from the group consisting of polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), polychlorinated biphenyl (PCB), polyvinyl alcohol (PC), polyethylene naphthalate (PEN), polyamide (PA), polyacetal (POM), polyphenylene ether (PPE), copolymers thereof or mixtures thereof. In addition, it is needless to say that the transparent base layer 110 may be formed of a transparent material for optical known to a person skilled in the art.

Although the thickness of the transparent base layer 110 is not particularly limited, it may be formed to a thickness of about 4 탆 to 300 탆, more preferably about 10 탆 to 200 탆. When the thickness of the transparent base material layer 110 is too small, rigidity is low and the reflective layer 120 to be described later can not be sufficiently protected. When the thickness of the transparent base material layer 110 is too thick, And the like. The thickness of the transparent substrate layer 110 may be suitably selected in consideration of the environment around the reflective member 100.

The reflective layer 120 is formed on one surface of the transparent substrate layer 110 and reflects light transmitted through the transparent substrate layer 110.

The metal forming the reflective layer 120 is preferably silver (Ag) or a silver alloy that reflects visible light with about 90% efficiency. Silver is a metal which is easily denatured by oxygen, sulfur, chlorine, sodium and the like and has low environmental resistance. Therefore, silver containing silver, palladium, copper, platinum, indium, tin, neodymium and cerium The reflective layer 120 may be formed using an alloy. At this time, when the content of the metal other than silver is large, the reflectance of the reflective layer 120 may be lowered. Therefore, the content of silver is preferably about 80 wt% to 99.99 wt%, more preferably about 90 wt% to 99.99 wt%.

However, the metal forming the reflective layer 120 is not limited thereto, and it is needless to say that a silver-white high reflectivity metal or an alloy of the metal may be used.

The reflective layer 120 is preferably formed uniformly to a thickness of about 500 Å to 2000 Å, more preferably to a thickness of about 1000 Å to 1500 Å. If the thickness of the reflective layer 120 is less than about 500 angstroms, the effect of reflecting light is small and many voids are generated on the surface of the reflective layer 120, so that it is difficult to form a uniform layer. If the thickness of the reflective layer 120 exceeds about 2000 ANGSTROM, the improvement of the reflectance is insignificant, but the process time and the process cost are increased, which is not reasonable.

The reflective layer 120 may be formed by a deposition method capable of forming a uniform layer with a fine thickness.

As the deposition method, a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method may be employed without limitation. Specifically, the metal layer may be formed by a chemical vapor deposition method such as APCVD, LPCVD, or PECVD, or may be formed by thermal evaporation deposition, sputtering ), And ion beam deposition (physical vapor deposition).

The reflective layer 120 may be formed by coating a resin layer containing silver powder on one side of the transparent substrate layer 110 or by attaching a silver thin film on one side of the transparent substrate layer 110 .

A transparent acrylic or urethane based primer layer may be included between the transparent substrate layer 110 and the reflective layer 120 to improve adhesion between the transparent substrate layer 110 and the reflective layer 120. The primer layer can increase the adhesion strength between the transparent substrate layer 110 and the reflective layer 120 deposited on the transparent substrate layer 110.

In order to improve the adhesion between the transparent substrate layer 110 and the reflective layer 120, plasma treatment, corona treatment, and the like are performed before forming the reflective layer 120 on the transparent substrate layer 110, The adhesion between the reflective layer 110 and the reflective layer 120 can be enhanced.

The antioxidation heat-dissipating layer 130 is formed on a surface of the reflective layer 120 facing the transparent substrate layer 110 side to prevent oxidation of the reflective layer 120 and effectively emit heat generated in the reflective layer 120. [ .

The anti-oxidation layer 130 is formed to cover the reflective layer 120 formed on one side of the transparent substrate layer 110. The antioxidant layer 130 may be formed to completely cover the reflective layer 120 so that metal such as silver that forms the reflective layer 120 is not exposed to the outside. When the metal forming the reflective layer 120 is oxidized, the reflectance of the reflective member 100 is lowered. Therefore, it is preferable that the anti-oxidation layer 130 is formed so that the reflective layer 120 does not contact external oxygen and moisture.

Conventionally, in order to prevent the oxidation of the reflection layer 120, an oxidation protection layer composed of an organic polymer material such as epoxy, polypropylene, polyethylene, polyimide, polyacryl, etc. is formed to cover the reflection layer 120 by a wet coating method .

On the contrary, the anti-oxidation layer 130 of the present invention is formed of a metal. At this time, it is preferable that the anti-oxidation layer 130 is formed of a metal different from the metal forming the reflective layer 120. Since the metal is superior to the organic polymer material in heat conductivity, when the oxidation-preventing and heat-dissipating layer 130 is formed of a metal, the heat generated in the reflection layer 120 may be transferred to the oxidation- ). ≪ / RTI >

The present invention can prevent heat generated in the reflective layer 120 from being trapped in the reflective member 100 by preventing the thermal deformation of the reflective member 100 by preventing the reflective layer 120 from being trapped by the reflective layer 120, It is possible to maintain a uniform reflectivity and to prevent a problem that a screen is distorted in a liquid crystal display device.

The anti-oxidation layer 130 is preferably formed of copper (Cu), which has excellent thermal conductivity and is a stable metal. The antioxidant layer 130 may be formed of one or more of aluminum (Al), nickel (Ni), chrome (Cr), titanium (Ti), gold (Au), and platinum Alloy, or may be formed of a metal having a good thermal conductivity.

The thickness of the oxidation preventing heat sink layer 130 and the method of forming the oxidation preventing heat sink layer 130 can be applied in the same manner as described in the thickness of the reflective layer 120 and the method of forming the reflective layer 120, Duplicate description will be omitted.

The adhesive layer 140 is formed on a surface of the antioxidation and heat dissipation layer 130 opposite to the surface of the antireflection layer 120. The adhesive layer 140 is formed on the reflective layer 120 and the antioxidation layer 130, Reflection heat-radiating layer 130 in the direction of the anti-oxidation heat-dissipating layer 130.

The adhesive layer 140 may include a white pigment 141 having a light reflecting property and an excellent thermal conductivity. The white pigment 141 is preferably aluminum oxide (alumina) having excellent thermal conductivity and excellent durability and strength.

The white pigment 141 such as aluminum oxide can not only reflect the light transmitted through the reflective layer 120 and the anti-oxidation layer 130 in the direction of the reflective layer 120 and the anti-oxidation layer 130, The heat transferred from the oxidation-preventing and heat-dissipating layer 130 can be effectively dispersed.

Therefore, by including such a white pigment in the adhesive layer 140, it is possible to prevent side effects of curling of the reflective member 100 due to thermal deformation. When the curling phenomenon of the reflection member 100 is improved, the reflection efficiency of the reflection sheet is improved due to the uniform reflection on the reflection layer 120, and problems such as distortion in the image of the liquid crystal display device can be improved There is a significant advantage in.

The white pigment 141 is not limited to the above-described aluminum oxide but may be any one or a mixture of two or more of titanium oxide, zinc oxide, silicon oxide, zirconium oxide, magnesium fluoride, barium sulfate and calcium carbonate.

The average particle diameter (hereinafter referred to as particle diameter) of the white pigment 141 may be about 200 nm to 5 占 퐉. More preferably, the particle diameter of the white pigment 141 may be about 500 nm to 3 占 퐉. If the particle size of the white pigment 141 is less than 200 nm, it is difficult to effectively reflect the light that has passed through the reflective layer 120 and the anti-oxidation and heat-releasing layer 130, It is preferable that the particle diameter of the white pigment 141 is within the above-mentioned range.

As the polymer resin used for the adhesive layer 140, any polymer resin selected from acrylic, urethane, epoxy, and melamine resins or a mixture thereof may be used without limitation.

The white substrate layer 150 may be attached to the adhesive layer 140 to provide a supporting force to the reflective member 100 and to reflect the light transmitted through the adhesive layer 140 in the direction of the adhesive layer 140.

The white base layer 150 may be formed of any one or a mixture of two or more of the materials described in the above-described transparent base layer 110 and the above. Unlike the transparent base layer 110, the white base layer 150 may be opaque or white to reflect light passing through the adhesive layer 140 toward the adhesive layer 140.

In order to configure the white base layer 150 to reflect light again, the white base layer 150 may include the white pigment described above in the adhesive layer 140.

When the white pigment layer 150 contains a white pigment, not only the light passing through the adhesive layer 140 can be reflected but also the white base layer 150 is generated in the reflective layer 120, , The heat transferred through the adhesive layer 140 may be effectively dispersed to release heat to the outside of the reflective member 100.

According to the reflective member 100 of the present invention described above, oxidation of the reflective layer 120 can be prevented by including the anti-oxidation and radiation layer 130, and heat generated from the reflective layer 120 can be effectively emitted. The reflective layer 120 and the antioxidant layer 130 may include an adhesive layer 140 and a white substrate layer 150 that reflect the light passing through the reflective layer 120 and the anti- .

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100 ... Reflective member
110 ... The transparent substrate layer
120 ... Reflective layer
130 ... The anti-oxidation heat-
140 ... Adhesive layer
141 ... White pigment
150 ... The white substrate layer

Claims (4)

A transparent base layer;
A reflective layer formed by laminating a metal on one surface of the transparent substrate layer;
An antioxidant heat-releasing layer formed by depositing a metal other than the metal forming the reflective layer on a surface of the reflective layer facing the surface facing the transparent substrate layer;
An adhesive layer formed on a surface of the antioxidation heat-dissipating layer facing the surface facing the reflective layer, the adhesive layer being configured to reflect the light transmitted through the reflective layer and the antioxidation layer in the direction of the reflective layer and the antioxidant layer; And
A white substrate layer attached to the adhesive layer and configured to reflect the light transmitted through the adhesive layer in the direction of the adhesive layer; / RTI >
Wherein the reflective layer is formed of silver (Ag), and the antioxidant-releasing layer is made of copper (Cu), and the antioxidant- ), Chromium (Cr), titanium (Ti), gold (Au), and platinum (Pt)
Wherein the adhesive layer comprises a white pigment,
Wherein the white pigment is any one or a mixture of two or more of aluminum oxide, titanium oxide, zinc oxide, silicon oxide, zirconium oxide, magnesium fluoride, barium sulfate and calcium carbonate. delete delete delete

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