KR20210085720A - transparent display and GLASS ASSEMBLY COMPRISING THE SAME - Google Patents

Abstract

A transparent display part according to an embodiment of the present invention includes a transparent base film, a transparent electrode layer disposed on the upper surface of the transparent base film, a plurality of light emitting elements disposed on the transparent electrode layer, an edge part electrode layer electrically connected to the transparent electrode layer and disposed at the edge of the transparent base film, an anisotropic conductive adhesive layer disposed on the edge part electrode layer, a plurality of flexible printed circuit boards (FPCBs) disposed on the anisotropic conductive adhesive layer and electrically connected to the edge part electrode layer through the anisotropic conductive adhesive layer, a first protective sheet disposed on the flexible printed circuit board, and a second protective sheet disposed under the transparent base film. It is possible to prevent the corrosion of the edge part electrode layer caused by external moisture.

Description

Transparent display unit and glass assembly including the same

It relates to a transparent display unit and a glass assembly. Specifically, it relates to a transparent display unit capable of displaying text or an image while maintaining visual transparency and a glass assembly. More specifically, it relates to a transparent display unit and a glass assembly for preventing corrosion of the edge portion electrode layer.

In general, glass windows play a role in letting outside light into the room and blocking and introducing outside air to properly ventilate the room air. In the closed state, they block the flow of heat from inside and outside to provide cooling and heating effects. plays a role in maintaining

Recently, as a glass window of a building, a window made of an LED all-glass assembly in which LED is inserted is used. Windows with LED all-glass assemblies can achieve lighting or advertising effects without compromising the unique function of glass windows. However, in the LED all-glass assembly, the LED is inserted between two glass plates, and in this case, the LED is mounted on a transparent electrode layer formed on the glass plate. In addition, the space between the glass sheets is sealed with a sealing member to protect the LED.

On the other hand, a flexible printed circuit board (FPCB) for electrically connecting the electrode layer and the driver control unit is formed on the edge portion of the transparent electrode layer of the glass assembly. Here, the driving control unit controls the driving of the LED to display text or images.

In the case of the glass assembly in which the LED is inserted between the two glass plates as described above, the LED disposed between the glass assembly and the electrode for driving the same may be corroded and damaged by moisture, etc. In order to improve durability, moisture, etc. More attention is needed to damage the electrodes by penetration. In particular, since the edge portion electrode layer electrically connected to the flexible printed circuit board is disposed on the edge, there is a problem in that it is more easily exposed to the risk of such corrosion.

The present invention is to solve this problem, and provides a transparent display unit and a glass assembly for preventing corrosion of the edge portion electrode layer caused by external moisture or the like.

However, the problems to be solved by the embodiments of the present invention are not limited to the above problems and may be variously expanded within the scope of the technical idea included in the present invention.

The transparent display unit according to an embodiment of the present invention is electrically connected to a transparent base film, a transparent electrode layer disposed on the upper surface of the transparent base film, a plurality of light emitting devices disposed on the transparent electrode layer, and the transparent electrode layer, and the transparent Edge part electrode layer disposed on the edge of the base film, an anisotropic conductive adhesive layer disposed on the edge part electrode layer, a plurality of flexible printing disposed on the anisotropic conductive adhesive layer and electrically connected to the edge part electrode layer through the anisotropic conductive adhesive layer and a circuit board (FPCB), a first protective sheet disposed on the flexible printed circuit board, and a second protective sheet disposed under the transparent base film.

The second protective sheet may be disposed to extend past an end of the transparent base film on a plane.

The second protective sheet may be in contact with a lower surface of the transparent base film and a lower surface of the flexible printed circuit board.

The first protective sheet may be disposed to extend past an end of the transparent base film on a plane.

Outside the end of the transparent base film, the first protective sheet and the second protective sheet may be adhered to each other between the plurality of flexible printed circuit boards.

The first protective sheet and the second protective sheet may be disposed to cover a longitudinal end of the region in which the edge portion electrode layer is formed on a plane, and the longitudinal direction is the transparent base film from which the flexible printed circuit board is drawn out. direction parallel to the end of

The first protective sheet may be disposed over an area wider than an area in which the edge portion electrode layer is formed on a plane.

The first protective sheet may be disposed to cover a boundary line between the transparent electrode layer and the edge portion electrode layer on a plane.

The first protective sheet may be disposed to cover the entire end of the anisotropic conductive adhesive layer on a plane.

The first protective sheet may be in contact with an upper surface of the flexible printed circuit board and an upper surface of the edge part electrode layer.

The first protective sheet and the second protective sheet may be disposed on only a part of the entire area of the transparent base film.

The anisotropic conductive adhesive layer may include a resin and conductive particles dispersed in the resin.

The first protective sheet may include at least one of acrylonitrile-butadiene rubber (NBR), a polyester resin, an acrylic resin, an epoxy resin, and a polyimide resin.

The first protective sheet may further include at least one of a silicone adhesive and an acrylic adhesive.

The second protective sheet may include at least one of acrylonitrile-butadiene rubber (NBR), a polyester resin, an acrylic resin, an epoxy resin, and a polyimide resin.

The second protective sheet may further include at least one of a silicone adhesive and an acrylic adhesive.

Each of the first protective sheet and the second protective sheet may have a thickness of 10 to 1000 μm.

A glass assembly according to another embodiment of the present invention is a glass assembly including the transparent display unit described above, a first sealing member disposed on the first protective sheet, and a first glass sheet disposed on an upper surface of the first sealing member. , a second sealing member disposed under the second protective sheet, and a second glass sheet disposed on a lower surface of the second sealing member may be further included.

The first sealing member includes at least one of polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), ionoplast polymer, cyclo olefin polymer (COP), and polyurethane. can do.

The second sealing member includes at least one of polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), ionoplast polymer, cyclo olefin polymer (COP), and polyurethane. can do.

The transparent display unit and the glass assembly according to an embodiment of the present invention include a first protective sheet disposed on a flexible printed circuit board and a second protective sheet disposed under the transparent base film, so that the anisotropic conductive adhesive layer and the sealing member are in contact Corrosion of the electrode layer of the edge part due to this can be prevented.

1 is a diagram schematically showing the configuration of a transparent display unit according to an embodiment of the present invention.
FIG. 2 is an enlarged view of part A of FIG. 1 .
FIG. 3 is a view showing a cross-section taken along line III-III' of FIG. 2 .
FIG. 4 is a view showing a cross-section taken along line IV-IV' of FIG. 2 .
5 is a view schematically showing a cross-section of a glass assembly according to an embodiment of the present invention.
6 is a photograph of the edge portion electrode layer after the corrosion rate evaluation of Example 1.
7 is a photograph of the edge portion electrode layer after the corrosion rate evaluation of Comparative Example 1.

Terms such as first, second and third are used to describe, but are not limited to, various parts, components, regions, layers and/or sections. These terms are used only to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, a first part, component, region, layer or section described below may be referred to as a second part, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of referring to specific embodiments only, and is not intended to limit the invention. As used herein, the singular forms also include the plural forms unless the phrases clearly indicate the opposite. The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and includes the presence or absence of another characteristic, region, integer, step, operation, element and/or component. It does not exclude additions.

When a part is referred to as being “on” or “on” another part, it may be directly on or on the other part, or the other part may be involved in between. In contrast, when a part refers to being "directly above" another part, the other part is not interposed therebetween.

Although not defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Commonly used terms defined in the dictionary are additionally interpreted as having a meaning consistent with the related technical literature and the presently disclosed content, and unless defined, they are not interpreted in an ideal or very formal meaning.

Hereinafter, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein.

The present inventors have attempted to provide a glass assembly capable of displaying text or images while maintaining visual transparency by inserting a transparent display unit in which an LED is mounted on a transparent substrate film between glass sheets.

A configuration of a transparent display unit according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4 .

1 is a view schematically showing the configuration of a transparent display unit according to an embodiment of the present invention, FIG. 2 is an enlarged view of part A of FIG. 1 , and FIG. 3 is a view taken along line III-III' of FIG. It is a view showing a cross section, and FIG. 4 is a view showing a cross section taken along line IV-IV' of FIG. 2 .

1 to 3 , the transparent display unit 100 includes a transparent base film 10, an electrode layer disposed on the upper surface of the transparent base film, and a plurality of light emitting diodes (LEDs, 21) mounted on the electrode layer. .

A driving control unit (not shown) for controlling driving of the transparent display unit is present at the edge portion of the electrode layer. The driving controller controls the driving of the transparent display unit 100 , that is, the driving of the light emitting diode 21 to display text or images.

In addition, a flexible printed circuit board (FPCB, 40) for electrically connecting the driving control unit and the electrode layer is present at an edge portion of the electrode layer. One embodiment of the present invention relates to this edge portion.

The electrode layer includes an edge portion electrode layer 22 connected to the flexible printed circuit board 40 at the edge portion and an internal electrode layer 23 on which the light emitting device 21 is mounted.

As shown in FIGS. 2 and 3 , the transparent display unit 100 according to an embodiment of the present invention includes a transparent base film 10 and an edge part electrode layer 22 disposed on the upper surface of the transparent base film 10 . , An anisotropic conductive adhesive layer 30 disposed on the edge part electrode layer 22, disposed on the anisotropic conductive adhesive layer 30, and electrically connected to the edge part electrode layer 22 through the anisotropic conductive adhesive layer 30. Flexible printing It includes a circuit board (FPCB, 40), a first protective sheet 51 disposed on the flexible printed circuit board 40, and a second protective sheet 52 disposed under the transparent base film (10).

In an embodiment of the present invention, by disposing the first protective sheet 51 on the flexible printed circuit board 40 and also by disposing the second protective sheet 52 disposed under the transparent base film 10, the edge portion By preventing corrosion of the electrode layer 22, the durability and lifespan of the transparent display unit 100 are improved.

Hereinafter, each configuration will be described in detail.

In an embodiment of the present invention, the transparent base film 10 may be a light-transmitting polymer film. The transparent base film 10 may have insulation and heat resistance in order to prevent a change in state due to external light while preventing electric power from leaking to the outside. Examples of the transparent base film 10 include, but are not limited to, polyethylene terephthalate (PET), polycarbonate (PC), cyclo olefin polymer (COP), and the like. For example, the transparent base film 10 may be a COP film. In this case, heat resistance is excellent, and durability of the transparent display unit 100 is improved.

The thickness of the transparent base film 10 is not particularly limited. However, if the thickness of the transparent substrate film 10 is too thin, when the glass assembly 200 is bonded, the transparent substrate film 10 is deformed due to the pressure applied to the LED side or cracks may be induced in the electrode layer region. can On the other hand, when the thickness of the transparent base film is too thick, cracks may occur in the glass sheets 71 and 72 due to stress. According to one example, the thickness of the transparent base film 10 may be about 200 to 300㎛. In this case, since the above-described problem does not occur, and heat resistance is excellent, thermal deformation of the transparent base film 10 can be prevented even when the transparent display unit 100 is exposed to external light for a long time.

In the transparent display unit 100 according to an embodiment of the present invention, the electrode layer is a portion disposed on one surface of the transparent base film 10 , and serves to drive the light emitting devices (LED, 21 ).

In addition, since the electrode layer has excellent light transmittance, not only the external light is incident, the portion on which the electrode layer is formed does not block the user's view, and the external light is also excellent. Accordingly, the transparent display unit 100 according to an embodiment of the present invention has excellent visual transparency.

The electrode layer includes an edge portion electrode layer 22 connected to the flexible printed circuit board 40 at the edge portion and an internal electrode layer 23 on which the light emitting device 21 is mounted.

The electrode layer includes a circuit pattern formed of at least one of metal, metallic nano wire, transparent conductive oxide, metal mesh, carbon nano tube, and graphene. can do. More specifically, the edge portion electrode layer 22 may include a metal line. The internal electrode layer 23 may include at least one of a metallic nano wire, a transparent conductive oxide, a metal mesh, a carbon nano tube, and a graphene.

Here, non-limiting examples of metal nanowires include silver nanowires, copper nanowires, nickel nanowires, and the like, and these may be used alone or in combination of two or more. Non-limiting examples of the transparent conductive oxide include Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Zinc Oxide (ZnO), Aluminum Zinc Oxide (AZO), In ₂ O ₃ (Indium Oxide), and the like, and these are alone or two or more types may be mixed and used. Non-limiting examples of the use of the metal mesh include silver (Ag) mesh, copper (Cu) mesh, aluminum (Al) mesh, and the like, and these may be used alone or in combination of two or more. Among them, silver nanowire, copper mesh and silver mesh have excellent conductivity and light transmittance, and ITO and IZO have low resistivity and can be deposited at low temperatures, and have high visible light transmittance. .

According to an example, the internal electrode layer 23 may include a circuit pattern formed of an electrode material selected from the group consisting of Ag nanowires, copper meshes, and silver meshes. In this case, the line width and thickness of the circuit pattern are not particularly limited. However, when the circuit pattern has a width of about 5 to 15 μm and a thickness of about 0.2 to 1 μm, the internal electrode layer 23 has a sheet resistance of about 0.5 to 3 Ω/sq.

The internal electrode layer 23 may be formed through a method known in the art. For example, the internal electrode layer 23 may form at least one circuit pattern by coating the above-described electrode material on the transparent base film 10 and then irradiating a laser or a mask and an etching process. Alternatively, the circuit pattern made of the electrode material may be formed on the transparent base film 10 through an inkjet printing process. However, the present invention is not limited thereto.

In the transparent display unit 100 according to an embodiment of the present invention, the light emitting device (Light Emitting Diode, LED, 21 ) is a light emitting body mounted on the internal electrode layer 23 and flickering according to the supply of power. Since a plurality of the light emitting devices 21 are spaced apart and arranged in a matrix form, various types of characters or images can be displayed, and a moving picture can also be displayed.

The light emitting device 21 usable in an embodiment of the present invention may be used without any particular limitation as long as it is commonly known in the art. Accordingly, the color of the light emitting device 21 may be a monochromatic light emitting device 21 such as red (R), green (G), or blue (B), or a two-color light emitting device 21 of R and G; It may be a tri-color light emitting device 21 of R, G, and B. When each light emitting device 21 is a three-color light emitting device 21 of R, G, and B, characters or images having various colors can be displayed.

The light emitting device 21 may be fixed on the internal electrode layer 23 through a mounting method known in the art. For example, a pad (not shown) including a material having high electrical conductivity such as silver (Ag) may be formed on at least a portion of the internal electrode layer 23 . In this case, the light emitting device 21 may be fixed on the pad using a low-temperature surface mount technology (SMT) process. In this case, the light emitting device 21 may be attached to the pad through solder.

The electrode layer is divided into an internal electrode layer 23 on which the LED 21 is mounted, and an edge part electrode layer 22 on which the LED 21 is not mounted and connected to the flexible printed circuit board 40 . The edge portion electrode layer 22 may be opaque, and the inner electrode layer 23 may be transparent.

The anisotropic conductive adhesive layer 30 is disposed on the electrode layer and electrically connects the flexible printed circuit board (FPCB, 40) and the edge part electrode layer 22 to be described later.

As the anisotropic conductive adhesive layer 30, an anisotropic conductive adhesive or adhesive film used in the field may be used in a variety of ways without limitation.

Specifically, the anisotropic conductive adhesive layer 30 may include a resin and conductive particles dispersed in the resin. As such, the anisotropic conductive adhesive layer 30 may use a film having electrical conductivity in the thickness direction of the adhesive layer and insulating properties in the surface direction of the film. In addition, a resin capable of securing adhesive performance with the edge portion electrode layer 22 and the flexible printed circuit board 40 may be used.

More specifically, the resin included in the anisotropic conductive adhesive layer 30 may include at least one of acryl and epoxy.

More specifically, the conductive particles included in the anisotropic conductive adhesive layer 30 may include a polymer core having an average particle diameter of 2 to 20 μm and a coating layer including at least one of Ni, Au, Cu and Ag.

The anisotropic conductive adhesive layer 30 may be positioned to include at least a portion of a portion where the edge portion electrode layer 22 and the flexible printed circuit board 40 overlap.

The flexible printed circuit board (FPCB, 40) is disposed on the anisotropic conductive adhesive layer 30 and is electrically connected to the edge portion electrode layer 22 through the anisotropic conductive adhesive layer 30 . The electrically connected flexible printed circuit board 40 electrically connects the edge portion electrode layer 22 and the driving controller (not shown). The driving control unit controls driving of the transparent display unit 100 . That is, by controlling the driving of the light emitting diode 21, a character or an image is displayed.

Flexible printed circuit board (FPCB, 40) A flexible printed circuit board used in the relevant field may be used without limitation. Specifically, the flexible printed circuit board 40 may include an electrode part and a resin layer on which the electrode part is formed. As shown in FIG. 2 , the electrode part of the flexible printed circuit board 40 may be positioned to correspond to the electrode part of the edge part electrode layer 22 .

The electrode part of the flexible printed circuit board 40 may be made of a conductive metal such as copper, tin-plated copper, or nickel-plated copper. As the conductor, a foil-shaped conductive metal is preferable.

The resin layer of the flexible printed circuit board 40 may include polyimide or polyester.

There may be one or a plurality of such flexible printed circuit boards 40 . However, when the flexible printed circuit board 40 is disposed on a large portion of the transparent base film 10 , the bonding reliability of the glass assembly 200 may be deteriorated. Therefore, the width of each flexible printed circuit board 40 so that the ratio of the total width (W) of the flexible printed circuit board 40 to the length (L) of the edge portion of the transparent base film 10 is in the range of about 0.1 to 0.5 It is desirable to control Here, the total width (W) of the flexible printed circuit board 40 is the sum of the widths (W1) of n number of flexible printed circuit boards (n×W ₁ ), and at this time, the width of each flexible printed circuit board 40 may be the same as or different from each other.

The first protective sheet 51 is disposed on the flexible printed circuit board 40 to prevent direct contact between the anisotropic conductive adhesive layer 30 and the first sealing member 61 to be described later, thereby forming the edge portion electrode layer 22 . prevent corrosion; The first protective sheet 51 prevents direct contact between the flexible printed circuit board 40 and the first sealing member 61 , and also has an adhesive ability between the flexible printed circuit board 40 and the first sealing member 61 . It can be used without restriction as long as it is a material that can secure

Specifically, the first protective sheet 51 may include acrylonitrile-butadiene rubber (NBR), a polyester resin, or an acrylic resin. It may include at least one of an epoxy resin and a polyimide resin. The first protective sheet 51 may be formed in one layer or two or more layers. When two or more materials of the above-described first protective sheet 51 are included, two or more materials may be included in one layer, or one or more materials may be included in two or more layers.

The first protective sheet 51 may further include at least one of a silicone adhesive and an acrylic adhesive. At least one of the silicone adhesive and the acrylic adhesive may be included in addition to the above-described layer, or may be configured as a separate layer. Polyethylene terephthalate (PET) may be used as the polyester resin. Specific examples of the first protective sheet 51 include a single layer of polyethylene terephthalate, acrylonitrile-butadiene rubber (NBR)/epoxy resin/epoxy resin three layers, and acrylonitrile-butadiene rubber (NBR)/acrylic resin/epoxy resin. 3 layers, acrylonitrile-butadiene rubber (NBR)/epoxy resin/epoxy resin/PET 4 layers, acrylonitrile-butadiene rubber (NBR)/epoxy resin/epoxy resin/PET 4 layers, acrylic resin single layer, acrylic resin/ 2 layers of polyethylene terephthalate, 2 layers of polyester resin/silicone adhesive, 2 layers of polyimide resin/silicone adhesive, 2 layers of polyimide resin/acrylic adhesive, or 3 layers of polyimide resin/silicone adhesive/acrylic adhesive can

The first protective sheet 51 may have a thickness of 10 to 1000 μm. At this time, when the first protective sheet 51 is multi-layered with two or more layers, it means the sum of the thicknesses of the multi-layers. When the first protective sheet 51 is too thin, it may be difficult to achieve the above-described purpose of preventing corrosion of the edge portion electrode layer 22 . When the first protective sheet 51 is too thick, the edge portion electrode layer 22 may be damaged during bonding using a sealing member due to a thickness step.

The first protective sheet 51 may be formed to cover the entire edge portion electrode layer 22 by being disposed over an area wider than the area in which the edge portion electrode layer 22 is formed on a plane. Furthermore, the first protective sheet 51 may be formed to cover both the anisotropic conductive adhesive layer 30 and the edge portion electrode layer 22 .

2 is a plan view of the transparent display unit 100 in which the edge portion electrode layer 22 is disposed on the lower portion and the flexible printed circuit board 40 is disposed on the upper portion, and as shown in FIG. 2 , the edge portion electrode layer 22 and An anisotropic conductive adhesive layer 30 is positioned on a portion where the flexible printed circuit board 40 overlaps.

The first protective sheet 51 may be disposed to cover a boundary line between the edge portion electrode layer 22 and the transparent electrode layer 23 . In addition, specifically, the first protective sheet 51 may extend to cover the entire end of the anisotropic conductive adhesive layer 30 on a plane.

The first protective sheet 51 may extend past the end of the transparent base film 10 on a plane. At this time, the end of the transparent substrate film 10 is the end of the portion from which the flexible printed circuit board 40 is drawn out. In addition, as shown in FIG. 3 , the first protective sheet 51 may contact the upper surface of the flexible printed circuit board 40 and the upper surface of the edge portion electrode layer 22 .

In a plan view, the first protective sheet 51 may be formed to be 5 mm to 10 mm larger than the end of the edge portion electrode layer 22 .

By forming the first protective sheet 51 as described above, penetration of moisture into the edge portion electrode layer 22 through the first sealing member 61 may be fundamentally prevented. If the first protective sheet 51 is not properly positioned so that moisture partially penetrates into the edge part electrode layer 22 through the first sealing member 61 , the cations (eg, Cu ^{2+ ) in the edge part electrode layer 22 .} ions) are generated, which move to the flexible printed circuit board 40 through the edge portion of the anisotropic conductive adhesive layer 30 to corrode the edge portion electrode layer 22 (so-called electro-migration). In addition, when moisture penetrates into the anisotropic conductive adhesive layer 30 and the anisotropic conductive adhesive layer 30 retains moisture, the thickness of the corresponding layer expands, and the conductive particles contained in the anisotropic conductive adhesive layer 30 become the edge electrode layer ( 22) and the flexible printed circuit board 40 becomes difficult to contact. In this case, an electrical connection between the edge portion electrode layer 22 and the flexible printed circuit board 40 may be defective. However, according to an embodiment of the present invention, by disposing the first protective sheet 51 on the flexible printed circuit board 40, it is possible to prevent such penetration of moisture.

In addition, such penetration of moisture can be more reliably prevented by the second protective sheet 52 . The second protective sheet 52 is disposed under the transparent base film 10 to further prevent moisture, etc. from penetrating from the lower or end of the transparent base film 10 , and also the edge part electrode layer 22 and the flexible printed circuit. Electrical connection by the anisotropic conductive film 30 of the substrate 40 can be made more reliably.

The second protective sheet 52 is acrylonitrile-butadiene rubber (NBR), polyester resin, or acrylic resin. It may include at least one of an epoxy resin and a polyimide resin. The second protective sheet 52 may be formed in one layer or two or more layers. When two or more materials of the above-described second protective sheet 52 are included, two or more materials may be included in one layer, or one or more materials may be included in two or more layers.

The second protective sheet 52 may further include at least one of a silicone adhesive and an acrylic adhesive. At least one of the silicone adhesive and the acrylic adhesive may be included in addition to the above-described layer, or may be configured as a separate layer. Polyethylene terephthalate (PET) may be used as the polyester resin. Specific examples of the second protective sheet 52 include a single layer of polyethylene terephthalate, three layers of acrylonitrile-butadiene rubber (NBR)/epoxy resin/epoxy resin, and acrylonitrile-butadiene rubber (NBR)/acrylic resin/epoxy resin. 3 layers, acrylonitrile-butadiene rubber (NBR)/epoxy resin/epoxy resin/PET 4 layers, acrylonitrile-butadiene rubber (NBR)/epoxy resin/epoxy resin/PET 4 layers, acrylic resin single layer, acrylic resin/ 2 layers of polyethylene terephthalate, 2 layers of polyester resin/silicone adhesive, 2 layers of polyimide resin/silicone adhesive, 2 layers of polyimide resin/acrylic adhesive, or 3 layers of polyimide resin/silicone adhesive/acrylic adhesive can

The second protective sheet 52 may have a thickness of 10 to 1000 μm. At this time, when the second protective sheet 52 is multi-layered with two or more layers, it means the sum of the thicknesses of the multi-layers. When the second protective sheet 52 is too thin, it may be difficult to achieve the above-described purpose of preventing corrosion of the edge portion electrode layer 22 . When the second protective sheet 52 is too thick, the edge portion electrode layer 22 may be damaged during bonding using a sealing member due to a thickness step.

As shown in FIG. 2 , the second protective sheet 52 may extend past the end of the transparent base film 10 on a plane. At this time, the end of the transparent substrate film 10 is the end of the portion from which the flexible printed circuit board 40 is drawn out. With this configuration, the second protective sheet 52 is formed to contact the lower surface of the transparent base film 10 and the lower surface of the flexible printed circuit board 40 as shown in FIG. 3 . As described above, the second protective sheet 52 extends past the end of the transparent base film 10 and is formed to contact the lower surface of the transparent base film 10 and the lower surface of the flexible printed circuit board 40 , Moisture that may penetrate through a portion from which the flexible printed circuit board 40 is withdrawn from the end of the base film 10 may also be blocked.

On the other hand, among the ends of the portion from which the flexible printed circuit board 40 is drawn out, in the portion where the flexible printed circuit board 40 is not located, that is, in the region between the flexible printed circuit boards 40 , as shown in FIG. 4 , The first protective sheet 51 and the second protective sheet 52 extending past the end of the transparent base film 10 may be in contact with each other to be adhered. Thereby, the same effect as being sealed at the end part of the transparent base film 10 by the 1st and 2nd protective sheets 51 and 52 can be acquired, and the penetration of moisture can be prevented more reliably.

In addition, the second protective sheet 52 may be formed to cover the longitudinal end of the region where the edge portion electrode layer 22 is formed on a plane. Here, the longitudinal direction is the left and right direction in FIG. 2 , which corresponds to the width direction of the flexible printed circuit board 40 , and the edge of the transparent substrate film 10 from which the flexible printed circuit board 40 is drawn outward is It is the direction parallel to the extension direction. By being formed in this way, in the region corresponding to the longitudinal direction of the edge portion electrode layer 22 , both the first and second protective sheets 51 and 52 are present above and below the edge portion electrode layer 22 . Because it is possible to effectively suppress the penetration of moisture into the anisotropic conductive adhesive layer 30 disposed therebetween, and also to suppress the thickness expansion of the anisotropic conductive adhesive layer 30, it is included in the anisotropic conductive adhesive layer 30 It is possible to prevent electrical connection failure caused by the conductive particles failing to contact the edge portion electrode layer 22 and the flexible printed circuit board 40 . At this time, the longitudinal end of the second protective sheet 52 may be formed to be 5 mm to 10 mm larger than the longitudinal end of the edge portion electrode layer 22 , but is not particularly limited and may be appropriately adjusted.

In addition, it is preferable that the second protective sheet 52 does not extend excessively beyond the boundary line between the edge portion electrode layer 22 and the internal electrode layer 23 . It is required to have a transparent property from the portion where the inner electrode layer 23 is located. When the second protective sheet 52 excessively extends into the region of the inner electrode layer 23 past the boundary line, an additional second protective sheet ( 52) because the transparency may decrease. Since the boundary line portion between the edge portion electrode layer 22 and the inner electrode layer 23 is located inward from the end of the relatively transparent base film 10, the penetration of moisture can be sufficiently prevented just by covering the first protective sheet 51. can

As such, the second protective sheet 52 is formed under the transparent base film 10, and is formed to cover the end of the transparent base film 10 from which the flexible printed circuit board 40 is drawn, thereby preventing the penetration of moisture. It is possible to more reliably block, and furthermore, it is possible to obtain the effect of more reliably making electrical connection by the anisotropic conductive adhesive layer 30 .

The first and second protective sheets 51 and 52 described above are not formed on the entire area of the transparent base film 10 , but are only partially formed corresponding to the above-described area before forming the glass assembly to be described later.

5 shows a cross-section of a glass assembly 200 according to an embodiment of the present invention. The glass assembly 200 of FIG. 5 is merely illustrative of the present invention, and the present invention is not limited thereto. Accordingly, the glass assembly 200 of FIG. 5 may be deformed into various shapes.

As shown in FIG. 5 , the glass assembly 200 according to an embodiment of the present invention has a transparent base film 10 , an edge part electrode layer 22 disposed on the upper surface of the transparent base film 10 , and an edge part electrode layer. The anisotropic conductive adhesive layer 30, which is disposed on the anisotropic conductive adhesive layer 30, and is electrically connected to the edge part electrode layer 22 through the anisotropic conductive adhesive layer 30 (FPCB, 40), flexible A first protective sheet 51 disposed on the printed circuit board 40 , a first sealing member 61 disposed on the first protective sheet 51 , and a first disposed on the first sealing member 61 . The glass sheet 71 , the second protective sheet 52 disposed under the transparent base film 10 , the second sealing member 62 disposed under the second protective sheet 51 , and the second sealing member 62 disposed under the second sealing member 62 . and a second glass sheet 52 which is

The transparent base film 10, the edge part electrode layer 22, the anisotropic conductive adhesive layer 30, the flexible printed circuit board 40, the first protective sheet 51, and the second described in the above-described transparent display part 100 Since the protective sheet 52 is the same as that of the transparent display unit 100 , the overlapping description will be omitted.

In the glass assembly 200 according to an embodiment of the present invention, the first sealing member 61 is disposed between the first glass sheet 71 and the transparent display unit 100 , and is a portion of the transparent display unit 100 . While protecting the light emitting device 21 , the first glass sheet 71 and the transparent display unit 100 are prevented from being separated from each other. In addition, the first sealing member 61 prevents external air such as moisture or oxygen from penetrating into the transparent display unit 100 . The first sealing member 61 may be disposed on the entire surface of the first glass sheet 71 .

The first sealing member 61 is formed of an optically transparent polymer so that external light can be incident without blocking the user's view. Specifically, the first sealing member 61 may include at least one of polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), ionoplast polymer, and polyurethane. For example, the first sealing member 61 may be formed of PVB resin. In this case, the first sealing member 61 may not only seal the transparent display unit 100 to the first glass sheet 71 , but also block outside air while blocking about 99% or more of UV rays.

The thickness of the first sealing member 61 is adjusted according to the height of the light emitting device 21 in the transparent display unit 100 . However, in order to protect the light emitting element 21 of the transparent display unit 100 and to prevent light transmittance from being impaired, the thickness of the first sealing member 61 with respect to the _{height H 1 of the light emitting element 21 .} this can be a range from 1.5 to 5 ratio (D ₁ / H ₁₎ of (D _1).

When the first sealing member 61 and the anisotropic conductive adhesive layer 30 are in direct contact, a reaction occurs in the electrode part and the edge part electrode layer 22 of the flexible printed circuit board 40, thereby causing corrosion. In one embodiment of the present invention, by configuring the first protective sheet 51 on the upper surface of the flexible printed circuit board 40, this is prevented.

In the glass assembly 200 according to an embodiment of the present invention, the first glass sheet 71 is made of glass and/or a transparent polymer such as polymethyl methacrylate (PMMA), polycarbonate (PC), or the like. As a plate member, it may be colorless and transparent, or colored transparent. In this case, the first glass sheet 71 may have a light transmittance of 85% or more with respect to visible light.

The shape of the first glass sheet 71 may be a planar shape or a curved shape like a bow, that is, a curved shape. Here, when the first glass sheet 71 has a curved shape, the radius of the curved surface R may be about 0.2 to 0.3 m.

In the glass assembly 200 according to an embodiment of the present invention, the second sealing member 62 is a portion disposed between the second glass sheet 72 and the transparent display unit 100, and external air such as moisture or oxygen It prevents penetration into the transparent display unit 100 .

5 , the second sealing member 62 may be disposed on the entire surface of the transparent display unit 100 to cover the transparent display unit 100 . In this case, the second sealing member 62 seals the transparent display unit 100 and the second glass sheet 72 so that they do not separate from each other.

The second sealing member 62 is formed of an optically transparent polymer so that external light can be incident without blocking the user's view. Specifically, the second sealing member 62 may include at least one of polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), ionoplast polymer, and polyurethane. For example, the second sealing member 62 may be formed of PVB resin. In this case, the second sealing member 62 may not only seal the transparent display unit 100 to the second glass sheet 72 , but also block external air while blocking about 99% or more of UV rays.

The thickness of the 2nd sealing member 62 is not specifically limited. However, if the thickness of the second sealing member 62 is too thick, pressure is applied to the transparent display unit 100 during the bonding process between the second glass sheet 72 and the transparent display unit 100 to cause cracks in the electrode layer, or Permeability may be reduced. On the other hand, if the thickness of the second sealing member 62 is too thin, sealing properties and air barrier properties may be deteriorated. Accordingly, the thickness of the second sealing member 62 may be 0.2 to 0.8 mm.

Like the first glass sheet 71, the second glass sheet 72 is also a plate member containing glass and/or a transparent polymer such as polymethyl methacrylate (PMMA), polycarbonate (PC), or the like, It may be colorless and transparent, or colored transparent. In this case, the second glass sheet 72 may have a light transmittance of 85% or more with respect to visible light. The second glass sheet 72 may have the same or different material, color, and/or light transmittance from the first glass sheet 71 .

The shape of the second glass sheet 72 may be a planar shape or a curved shape like a bow, that is, a curved shape. Here, when the second glass sheet 72 has a curved shape, the radius of the curved surface R may be about 0.2 to 0.3 m.

In the glass assembly 200 according to an embodiment of the present invention, the transparent display unit 100 is a portion interposed between the first glass sheet 71 and the second glass sheet 72 , and includes images and text. Display information. In addition, since the transparent display unit 100 has a yellowness index (YI) value of 3.0 or less, not only external light may be incident, but also the visual transparency of the glass assembly 200 is not reduced, and thus, the user's view do not block

In one embodiment of the present invention, there may be one transparent display unit 100 . Alternatively, there may be a plurality of transparent display units 100 . The plurality of transparent display units 100 may display one large image. That is, when the image signal is divided according to the screen division method set in the LED driver, one large image is generated into a plurality of divided images, and then each divided image can be displayed through each corresponding transparent display unit 100 . have.

The glass assembly 200 has a light transmittance of about 70 to 80% and a light reflectance of about 8 to 15% at a wavelength of the visible light region (wavelength of 400 to 700 nm). In particular, when the glass assembly 200 according to an embodiment of the present invention has a light transmittance of 70% or more at a wavelength of the visible ray region and satisfies the following relation 1, the view is not blocked by the electrode layer, and from the inside or the outside Permeability can be secured, and also appearance characteristics, electrical conductivity, and visual transparency can be further improved.

[Relational Expression 1]

(In Relation 1, T is the light transmittance (%) of the glass assembly at the wavelength of the visible ray region, and R _S is the sheet resistance (Ω/sq) of the transparent electrode layer.)

According to one example, the glass assembly 200 has a light transmittance of 70% or more at a wavelength of a visible ray region, and satisfies the following relational expression (2). In this case, since the glass assembly 200 has very good electrical conductivity, not only power consumption is low and heat generation is low, but also visual transparency is secured, so that characters or images can be displayed more clearly.

[Relational Expression 2]

(In Relation 2, T is the light transmittance (%) of the glass assembly at the wavelength of the visible ray region, and R _S is the sheet resistance (Ω/sq) of the transparent electrode layer.)

In addition, in an embodiment of the present invention, by arranging the first protective sheet 51 on the upper surface of the flexible printed circuit board 40 and configuring the second protective sheet 52 on the lower surface of the transparent base film 10, moisture Corrosion that may occur in the electrode layer 22 of the edge portion is prevented by the penetration.

That is, when the glass assembly 200 is immersed in water at 100° C. for 48 hours in a state in which current is applied to the edge electrode layer 22 and the flexible printed circuit board 40, the corrosion rate of the edge electrode layer 22 This can be less than 1%. In this case, the corrosion rate means the weight of the corroded edge portion electrode layer 22 with respect to the total weight of the edge portion electrode layer 22 .

Hereinafter, the present invention will be described in more detail through experimental examples. However, these experimental examples are only for illustrating the present invention, and the present invention is not limited thereto.

[Example 1]

1-1. Manufacture of transparent display part

On one side of the PET film substrate (size: 500 mm × 600 mm, thickness: 250 μm), a circuit pattern (line width: 15 μm) is formed with a copper mesh through a mask and etching process to form an electrode layer (sheet resistance: about 1 Ω/ sq) was formed. The edge portion electrode layer formed a circuit pattern with copper lines. After that, silver (Ag) solder was formed on the electrode layer through a screen printing process, and a plurality of LEDs (height: about 1 mm) were mounted on each silver (Ag) solder using a low-temperature surface mount technology (SMT) method. . An anisotropic conductive adhesive layer (RA3351, manufactured by H&S) was formed on the edge of the electrode layer on which the LED was not mounted, and a flexible printed circuit board (FPCB) was laminated on the anisotropic conductive adhesive layer. Thereafter, protective sheets (silicone adhesive layer/PET two layers) were respectively laminated on the upper surface of the flexible printed circuit board and the lower surface of the PET film to manufacture a transparent display unit.

1-2. manufacture of glass assemblies

On the first glass sheet, a PVB resin film (thickness 1.52m, Kuraray Butatcite), the transparent display unit prepared in Example 1-1, a PVB resin film (thickness 1.52m, Kuraray Butatcite) and a second glass sheet are sequentially laminated After that, the glass assembly was prepared by bonding by pressing at 130° C. at a pressure of 11.5 bar.

[Comparative Example 1]

The same procedure as in Example 1 was carried out, except that a protective sheet was not formed on the upper surface of the flexible printed circuit board and the lower surface of the PET film during the manufacturing process of the transparent display unit.

[Experimental Example: Corrosion Rate Evaluation]

The glass assemblies prepared in Example 1 and Comparative Example 1 were exposed to high temperature (85° C.) and high humidity (85%) for 1000 hours in a state where current was applied to the electrode layer and the flexible printed circuit board. Then, the state of the portion where the edge portion electrode layer is located was observed under a microscope. The results are shown in FIGS. 6 and 7 .

As shown in FIG. 6 , cracks generated by the movement of metal ions and reaction with moisture were not observed in the vicinity of the edge portion electrode layer of Example 1. However, as shown in FIG. 7 , such cracks were observed near the edge portion electrode layer of Comparative Example 1, confirming that corrosion was in progress.

The present invention is not limited to the above embodiments, but can be manufactured in various different forms, and those of ordinary skill in the art to which the present invention pertains can take other specific forms without changing the technical spirit or essential features of the present invention. It will be understood that it can be implemented as Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10: transparent base film,
21: light emitting diode,
22: edge part electrode layer,
23: an inner electrode layer;
30: anisotropic conductive adhesive layer;
40: flexible printed circuit board,
51: a first protective sheet;
52: a second protective sheet;
61: a first sealing member;
62: a second sealing member;
71: a first glass sheet;
72: a second glass sheet;
100: transparent display unit,
200: glass assembly

Claims (20)

transparent base film,
A transparent electrode layer disposed on the upper surface of the transparent base film,
a plurality of light emitting devices disposed on the transparent electrode layer;
an edge part electrode layer electrically connected to the transparent electrode layer and disposed at an edge of the transparent base film;
An anisotropic conductive adhesive layer disposed on the edge portion electrode layer,
a plurality of flexible printed circuit boards (FPCBs) disposed on the anisotropic conductive adhesive layer and electrically connected to the edge portion electrode layer through the anisotropic conductive adhesive layer;
a first protective sheet disposed on the flexible printed circuit board; and
A second protective sheet disposed on the lower surface of the transparent base film
A transparent display unit comprising a. According to claim 1,
The second protective sheet is a transparent display unit arranged to extend past an end of the transparent base film on a plane. 3. The method of claim 2,
The second protective sheet is a transparent display unit in contact with a lower surface of the transparent base film and a lower surface of the flexible printed circuit board. 3. The method of claim 2,
The first protective sheet is a transparent display unit arranged to extend past an end of the transparent base film on a plane. 5. The method of claim 4,
A transparent display unit in which the first protective sheet and the second protective sheet are adhered to each other between the plurality of flexible printed circuit boards outside the end of the transparent base film. According to claim 1,
The first protective sheet and the second protective sheet are disposed to cover the longitudinal end of the region in which the edge portion electrode layer is formed on a plane,
The longitudinal direction is a transparent display unit in a direction parallel to an end of the transparent base film from which the flexible printed circuit board is drawn out. According to claim 1,
The first protective sheet is a transparent display unit disposed over an area wider than the area in which the edge portion electrode layer is formed on a plane. 8. The method of claim 7,
The first protective sheet is a transparent display unit disposed to cover a boundary line between the transparent electrode layer and the edge portion electrode layer on a plane. 8. The method of claim 7,
The first protective sheet is a transparent display unit disposed to cover the entire end of the anisotropic conductive adhesive layer on a plane. 8. The method of claim 7,
The first protective sheet is a transparent display unit in contact with an upper surface of the flexible printed circuit board and an upper surface of the edge part electrode layer. According to claim 1,
The transparent display unit in which the first protective sheet and the second protective sheet are disposed only in a part of the entire area of the transparent base film. According to claim 1,
The anisotropic conductive adhesive layer is a transparent display unit comprising a resin and conductive particles dispersed in the resin. According to claim 1,
The first protective sheet may include at least one of acrylonitrile-butadiene rubber (NBR), a polyester resin, an acrylic resin, an epoxy resin, and a polyimide resin. 14. The method of claim 13,
The first protective sheet is a transparent display unit further comprising at least one of a silicone adhesive and an acrylic adhesive. According to claim 1,
The second protective sheet may include at least one of acrylonitrile-butadiene rubber (NBR), a polyester resin, an acrylic resin, an epoxy resin, and a polyimide resin. 16. The method of claim 15,
The second protective sheet is a transparent display unit further comprising at least one of a silicone adhesive and an acrylic adhesive. According to claim 1,
The first protective sheet and the second protective sheet each have a thickness of 10 to 1000 ㎛ transparent display unit. A glass assembly comprising the transparent display unit according to any one of claims 1 to 17, comprising:
a first sealing member disposed on the first protective sheet;
a first glass sheet disposed on an upper surface of the first sealing member;
a second sealing member disposed under the second protective sheet;
A second glass sheet disposed on a lower surface of the second sealing member
Glass assembly further comprising a. 19. The method of claim 18,
The first sealing member includes at least one of polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), ionoplast polymer, cyclo olefin polymer (COP), and polyurethane. glass assembly. 19. The method of claim 18,
The second sealing member includes at least one of polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), ionoplast polymer, cyclo olefin polymer (COP), and polyurethane. glass assembly.

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