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1. WO2020111581 - TRANSPARENT DISPLAY UNIT AND GLASS ASSEMBLY COMPRISING THE SAME

Document

Description

Title of Invention

Technical Field

1  

Background Art

2   3   4   5  

Disclosure of Invention

6   7   8   9   10   11   12   13   14   15   16   17   18   19   20   21   22   23   24   25   26  

Brief Description of Drawings

27   28   29   30   31   32   33   34  

Mode for the Invention

35   36   37   38   39   40   41   42   43   44   45   46   47   48   49   50   51   52   53   54   55   56   57   58   59   60   61   62   63   64   65   66   67   68   69   70   71   72   73   74   75   76   77   78   79   80   81   82   83   84   85   86   87   88   89   90   91   92   93   94   95   96   97   98   99   100   101   102   103   104   105   106   107   108   109   110   111   112   113   114   115   116   117   118   119   120   121   122   123   124   125   126   127   128   129   130   131   132   133   134   135   136   137   138   139   140   141   142   143   144   145   146   147   148  

Claims

1   2   3   4   5   6   7   8   9   10   11   12   13   14   15   16   17  

Drawings

1   2   3   4   5   6   7   8  

Description

Title of Invention : TRANSPARENT DISPLAY UNIT AND GLASS ASSEMBLY COMPRISING THE SAME

Technical Field

[1]
The present invention relates to a transparent display unit and a glass assembly. Specifically, the present invention relates to a transparent display unit and a glass assembly capable of displaying characters or images while maintaining visual transparency. More specifically, the present invention relates to a transparent display unit and a glass assembly for preventing corrosion of an edge electrode layer generated due to contact of a sealing member and an anisotropic conductive adhesive layer.

Background Art

[2]
In general, a glass window serves to allow external light to be introduced indoors, to perform appropriate ventilation of indoor air by blocking and introducing external air, and to maintain cooling and heating efficiency by blocking heat flow between indoors and outdoors in a closed state.
[3]
In recent years, a window made of a light emitting diode (LED) electro-optical glass assembly into which LEDs are inserted has been used as a glass window of a building. The window made of an LED electro-optical glass assembly may exhibit an illumination effect and an advertising effect without impairing an intrinsic function of a glass window. However, the LED electro-optical glass assembly has the LEDs inserted between two glass sheets, and the LEDs are mounted on an electrode layer formed on a glass sheet. In addition, a space between the glass sheets is sealed by a sealing member so as to protect the LEDs.
[4]
On the other hand, a flexible printed circuit board (FPCB) for electrically connecting the electrode layer and the driver controller is formed at the edge portion of the electrode layer of the glass assembly. Here, the driving controller controls the driving of the LED to display a character or an image.
[5]
The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

Disclosure of Invention

[6]
A transparent display unit and a glass assembly are provided.
[7]
Specifically, the transparent display unit and the glass assembly capable of displaying characters or images while maintaining visual transparency are provided. More specifically, the transparent display unit and the glass assembly for preventing corrosion of an edge electrode layer generated due to contact of a sealing member and an anisotropic conductive adhesive layer are provided.
[8]
A transparent display unit according to an exemplary embodiment of the present invention includes: a transparent substrate film; an edge electrode layer disposed on the upper surface of the transparent substrate film; an anisotropic conductive adhesive layer disposed on the edge electrode layer; a flexible printed circuit board (FPCB) disposed on the anisotropic conductive adhesive layer and electrically connected to the edge electrode layer through the anisotropic conductive adhesive layer; and a protective adhesive layer disposed on the flexible printed circuit board.
[9]
With respect to a plane of the transparent display unit in which the edge electrode layer is disposed downwardly and the flexible printed circuit board is disposed upwardly, the protective adhesive layer may extend beyond the lower end of the edge electrode layer.
[10]
The protective adhesive layer may extend beyond the upper end of the anisotropic conductive adhesive layer.
[11]
The protective adhesive layer may extend beyond the left end and the right end of the anisotropic conductive adhesive layer.
[12]
A driving controller controlling the driving of the transparent display unit may be further included, and the flexible printed circuit board may electrically connect the edge electrode layer and the driving controller.
[13]
A ratio W/L of the entire width W of one or a plurality of flexible printed circuit boards to the edge length L of the transparent substrate film may be 0.1 to 0.5.
[14]
The thickness of the transparent substrate film may be 200 to 300 μm.
[15]
The edge electrode layer may include a circuit pattern formed of one or more among a metal line, a metallic nanowire, a transparent conductive oxide, a metal mesh, carbon nanotubes, and graphene.
[16]
The anisotropic conductive adhesive layer may include a resin and a conductive particle dispersed in the resin.
[17]
The protective adhesive layer may include one or more among acrylonitrile-butadiene rubber (NBR), a polyester resin, an acryl resin, an epoxy resin, and a polyimide resin.
[18]
The protective adhesive layer may further include one or more of a silicone adhesive and an acrylic adhesive.
[19]
The protective adhesive layer may have a thickness of 10 to 1000 μm.
[20]
A glass assembly according to an exemplary embodiment of the present invention includes: a transparent substrate film; an edge electrode layer disposed on the upper surface of the transparent substrate film; an anisotropic conductive adhesive layer disposed on the edge electrode layer; a flexible printed circuit board (FPCB) disposed on the anisotropic conductive adhesive layer and electrically connected to the edge electrode layer through the anisotropic conductive adhesive layer; a protective adhesive layer disposed on the flexible printed circuit board; a first sealing member disposed on the protective adhesive layer; and a first glass sheet disposed on the first sealing member.
[21]
A second sealing member disposed on the lower surface of the transparent substrate film, and a second glass sheet disposed on the lower surface of the second sealing member, may be further included.
[22]
The first sealing member may include one or more among polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), an ionoplast polymer, a cyclo olefin polymer (COP), and polyurethane.
[23]
The second sealing member may include one or more among polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), an ionoplast polymer, a cyclo olefin polymer (COP), and polyurethane.
[24]
In a state that a current is applied to the edge electrode layer and the flexible printed circuit board, when the glass assembly is immersed in water at 100 ℃ for 48 hours, a corrosion rate may be 1 % or less.
[25]
The transparent display unit and the glass assembly according to an exemplary embodiment of the present invention may display the characters or the images while maintaining the visual transparency. For this reason, the transparent display unit and the glass assembly according to the exemplary embodiment of the present invention are applied to an exterior window of a building or a windshield of a vehicle to provide desired information to the user while maintaining the cooling and heating effect of the room to be used for lighting, an advertising means, and the like.
[26]
Also, the transparent display unit and the glass assembly according to an exemplary embodiment of the present invention provides the protective adhesive layer disposed on the flexible printed circuit board, thereby preventing the corrosion of the edge electrode layer due to the contact of the anisotropic conductive adhesive layer and the sealing member.

Brief Description of Drawings

[27]
FIG. 1 is a cross-sectional view schematically showing a cross-section of a transparent display unit.
[28]
FIG. 2 is a cross-sectional view schematically showing a cross-section of a transparent display unit according to an exemplary embodiment of the present invention.
[29]
FIG. 3 is a cross-sectional view schematically showing a plane of a transparent display unit according to an exemplary embodiment of the present invention.
[30]
Fig. 4 is a cross-sectional view schematically showing a plane of the transparent display unit according to an exemplary embodiment of the present invention.
[31]
FIG. 5 is a cross-sectional view schematically showing a plane of the transparent display unit according to an exemplary embodiment of the present invention.
[32]
FIG. 6 is a cross-sectional view schematically showing a cross-section of a transparent display unit according to an exemplary embodiment of the present invention.
[33]
FIG. 7 is a photo of an edge electrode layer after estimating a corrosion rate of Example 1.
[34]
FIG. 8 is a photo of an edge electrode layer after estimating a corrosion rate of Comparative Example 1.

Mode for the Invention

[35]
The terms "first", "second", and "third" are used herein to explain various parts, components, regions, layers, and/or sections, but it should be understood that they are not limited thereto. These terms are used only to discriminate one portion, component, region, layer, or section from another portion, component, region, layer, or section. Thus, a first portion, component, region, layer, or section may be referred to as a second portion, component, region, layer, or section without departing from the scope of the present invention.
[36]
The technical terms used herein are to simply mention a particular embodiment, and are not meant to limit the present invention. An expression used in the singular encompasses the expression of the plural, unless it has a clearly different meaning in the context. It will be further understood that the term "comprises" or "includes", used in this specification, specifies stated properties, regions, integers, steps, operations, elements, and/or components, but does not preclude the presence or addition of other properties, regions, integers, steps, operations, elements, components, and/or groups.
[37]
When referring to a part as being "on" or "above" another part, it may be positioned directly on or above another part, or another part may be interposed therebetween. In contrast, when referring to a part being "directly above" another part, no other part is interposed therebetween.
[38]
Unless defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms defined in commonly used dictionaries are further interpreted as having meanings consistent with the relevant technical literature and the present disclosure, and are not to be construed as idealized or very formal meanings unless defined otherwise.
[39]
The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.
[40]
The present inventors provide a glass assembly capable of displaying characters 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.
[41]
FIG. 1 shows a cross-section of a transparent display unit 100 according to an exemplary embodiment of the present invention. As shown in FIG. 1, the transparent display unit 100 includes a transparent substrate film 10, an electrode layer disposed on an upper surface of the transparent substrate film, and a plurality of light emitting diodes (LEDs) 21 mounted on the electrode layer.
[42]
A driving controller 41 for controlling driving of the transparent display unit is disposed in the edge portion of the electrode layer. The driving controller 41 controls the driving of the transparent display unit 100, that is, controls the driving of the light emitting diodes 21 to display the characters or the images.
[43]
Also, a flexible printed circuit board (FPCB) 40 for electrically connecting the driving controller 41 and the electrode layer is disposed in the edge portion of the electrode layer. An exemplary embodiment of the present invention relates to the edge portion (a dotted line circle).
[44]
The electrode layer includes an edge electrode layer 22 connected to the flexible printed circuit board 40 in the edge portion, and an inner electrode layer 23 to which the light emitting diode 21 is mounted.
[45]
FIG. 2 is a cross-sectional view of a transparent display unit 100 according to an exemplary embodiment of the present invention. The transparent display unit 100 of FIG. 2 is merely for illustrating the present invention, and the present invention is not limited thereto. Thus, the transparent display unit 100 of FIG. 2 may be transformed into various forms.
[46]
As shown in FIG. 2, the transparent display unit 100 according to an exemplary embodiment of the present invention includes the transparent substrate film 10, the edge electrode layer 22 disposed on the transparent substrate film 10, an anisotropic conductive adhesive layer 30 disposed on the edge electrode layer 22, the flexible printed circuit board (FPCB) 40 disposed on the anisotropic conductive adhesive layer 30 and electrically connected to the edge electrode layer 22 through the anisotropic conductive adhesive layer 30, and a protective adhesive layer 50 disposed on the flexible printed circuit board 40.
[47]
In an exemplary embodiment of the present invention, by disposing the protective adhesive layer 50 on the flexible printed circuit substrate 40, the corrosion of the edge electrode layer 22 is prevented, such that durability and life-span of the transparent display unit 100 are improved.
[48]
Hereinafter, each configuration is described in detail.
[49]
In an exemplary embodiment of the present invention, the transparent substrate film 10 may be a light transmitting polymer film of one layer or a plurality of layers. The transparent substrate film 10 may have an insulation characteristic and heat resistance to prevent a state change by external light while preventing power from being leaked to the outside. An example of the transparent substrate film 10 is polyethylene terephthalate (PET), polycarbonate (PC), a cyclo olefin polymer (COP), etc. however it is not limited thereto. For example, the transparent substrate film 10 may be a COP film. In this case, the heat resistance is excellent, and the durability of the transparent display unit 100 is improved.
[50]
The thickness of this transparent substrate film 10 is not particularly limited. However, if the thickness of the transparent substrate film 10 is very thin, during the bonding of a glass assembly 200, the transparent substrate film 10 may be deformed by a pressure applied to the LED side or a crack may be caused on the electrode layer part. On the other hand, if the thickness of the transparent substrate film is very thick, a crack may be generated in a glass sheet 71 or 72 due to the stress. According to an exemplary embodiment, the thickness of the transparent substrate film 10 may be about 200 to 300 μm. In this case, since the above-described problem does not only occur but also the heat resistance is excellent, even if the transparent display unit 100 is exposed to external light for a long time, thermal deformation of the transparent substrate film 10 may be prevented.
[51]
In the transparent display unit 100 according to an exemplary embodiment of the present invention, the electrode layer is a portion disposed on one surface of the transparent substrate film 10 and serves to drive the light emitting diodes (LED) 21.
[52]
In addition, since the electrode layer is excellent in light transmittance, not only is the external light incident, but the portion in which the electrode layer is formed does not block the user's view, and the appearance characteristic is also excellent. Therefore, the transparent display unit 100 according to an exemplary embodiment of the present invention has excellent visual transparency.
[53]
The electrode layer includes an edge electrode layer 22 connected to the flexible printed circuit board (FPCB) 40 in the edge portion, and an inner electrode layer 23 to which the light emitting diode 21 is mounted. The edge electrode layer may include a circuit pattern formed of one or more of a metal, a metallic nanowire, a transparent conductive oxide, a metal mesh, carbon nanotubes, and graphene. More specifically, the edge electrode layer 22 may include a metal line. The inner electrode layer 23 may include one or more among the metallic nanowire, the transparent conductive oxide, the metal mesh, the carbon nanotubes, and the graphene.
[54]
Here, a non-limiting example of the metal nanowire may include Ag nanowire, copper nanowire, nickel nanowire, and the like, which may be singly used or two or more types thereof may be mixedly used. A non-limiting example of the transparent conductive oxide may include Indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), aluminum zinc oxide (AZO), indium oxide (In 2O 3), and the like, which may be singly used or two or more types thereof may be mixedly used. A non-limiting example of the metal mesh may include silver (Ag) mesh, copper (Cu) mesh, aluminum (Al) mesh, and the like, which may be singly used or two or more types thereof may be mixedly used. Among them, the silver nanowire, the copper mesh, and the silver mesh are excellent in conductivity and light transmittance, while ITO and IZO have low specific resistance values, may be deposited at a low temperature, and are high in light transmittance of visible rays.
[55]
According to one example, the inner electrode layer 23 may include a circuit pattern made of an electrode material selected from a group consisting of the Ag nanowire, the copper mesh, and the silver mesh. In this case, a line width and a thickness of the circuit pattern are not particularly limited. However, when the circuit pattern has a width of approximately 5 to 15 m and a thickness of approximately 0.2 to 1 m, the transparent electrode layer 120 has sheet resistance of approximately 0.5 to 3 Ω/sq.
[56]
The inner electrode layer 23 may be formed through a method known to the art. For example, in the inner electrode layer 23, the above-described electrode material is coated on the transparent substrate film 10, and then a laser is irradiated onto the electrode material or mask and etching processes are performed to form at least a circuit pattern. Alternatively, the circuit pattern made of the electrode material may be formed on the transparent substrate film 10 through an inkjet printing process. However, the present invention is not limited thereto.
[57]
In the transparent display unit 100 according to an exemplary embodiment of the present invention, the light emitting diode (LED) 21 is a light emitting member which is mounted on the inner electrode layer 23 and is lit according to supply of power. A plurality of light emitting diodes 21 are spaced apart from each other and arranged in a matrix form, various forms of characters or images may be displayed and a video may also be displayed.
[58]
The light emitting diode 21 available in an exemplary embodiment of the present invention may be used without a particular limit as long as it is generally known to the art. Further, the light emitting diode 21 may be a single-color light emitting diode 21 having a color such as red (R), green (G), blue (B), etc., a two-color light emitting diode 21 having colors such as R and G, or a three-color light emitting diode 21 having colors such as R, G, and B. When the respective light emitting diode 21 are the three-color light emitting diodes 130 of R, G, and B, characters or images having various colors may be displayed.
[59]
The light emitting diode 21 may be fixed onto the inner electrode layer 23 through a mounting method known to the art
[60]
For example, a pad (not illustrated) including a material having high electrical conductivity such as silver (Ag) may be formed in at least a part of the inner electrode layer 23. In this case, the light emitting diode 21 may be fixed onto the pad by using a low-temperature surface mount technology (SMT) process. In this case, the light emitting diode 21 may be attached to the pad through solder.
[61]
The electrode layer is divided into the inner electrode layer 23 on which the LED 21 is mounted and the edge electrode layer 22 connected to the flexible printed circuit board (FPCB) 40 without mounting the LED 21. The edge electrode layer 22 may be opaque and the inner electrode layer 23 may be transparent.
[62]
The anisotropic conductive adhesive layer 30 is disposed on the electrode layer, and electrically connects the flexible printed circuit board (FPCB) 40 to be described later and the edge electrode layer 22.
[63]
The anisotropic conductive adhesive layer 30 may variously use the anisotropic conductive adhesive layer 30 used in the field without limitation.
[64]
In detail, the anisotropic conductive adhesive layer 30 may include a resin and a conductive particle dispersed in the resin. As described above, the anisotropic conductive adhesive layer 30 may be a film having electrical conductivity in the thickness direction of the adhesive layer and representing an insulation characteristic in the surface direction of the film. In addition, it is possible to use a resin that can secure the adhesion to the edge electrode layer 22 and the flexible printed circuit board 40.
[65]
More specifically, the resin included in the anisotropic conductive adhesive layer 30 may include at least one kind or more of acryl and epoxy.
[66]
In detail, the conductive particle 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 one or more of Ni, Au, Cu, and Ag.
[67]
The anisotropic conductive adhesive layer 30 may be disposed so as to include at least part among the portion where the edge electrode layer 22 and the flexible printed circuit board (FPCB) 40 are overlapped.
[68]
The flexible printed circuit board (FPCB) 40 is disposed on the anisotropic conductive adhesive layer 30, and is electrically connected to the edge electrode layer 22 through the anisotropic conductive adhesive layer 30. The electrically connected flexible printed circuit board 40 electrically connects the edge electrode layer 22 and the driving controller 41. The driving controller 41 controls the driving of the transparent display unit 100. That is, by controlling the driving of the light emitting diode 21, the characters or the images are displayed.
[69]
The flexible printed circuit board (FPCB) 40 may be a flexible printed circuit board used in the field without limitation. In more detail, the flexible printed circuit board 40 may include an electrode part (a black part) and a resin layer (a white part). As shown in FIG. 2, the electrode part of the flexible printed circuit board 40 may be disposed to correspond to the electrode part of the edge electrode layer 22.
[70]
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 a conductor, a thin conductive metal is preferable.
[71]
The resin layer of the flexible printed circuit board 40 may include polyimide or polyester.
[72]
The number of flexible printed circuit boards 40 may be one or more. However, when the flexible printed circuit board 40 is disposed on a large portion of the transparent substrate film 10, the bonding reliability of the glass assembly 200 may be deteriorated. Therefore, it is preferable to adjust the width of each flexible printed circuit board 40 so that the ratio of the entire width W of the flexible printed circuit board 40 for the edge length L of the transparent substrate film 10 is about a 0.1 to 0.5 range. Here, the entire width W of the flexible printed circuit board 40 is the sum of the width W1 of the n flexible printed circuits (FPC) as n X W1, and in this case, the width of each flexible printed circuit board 40 may be the same or different. FIG. 5 briefly illustrates the relationship between the edge length L and the width W of the flexible printed circuit board 40.
[73]
The protective adhesive layer 50 is disposed on the flexible printed circuit board 40 to prevent direct contact of the anisotropic conductive adhesive layer 30 and a first sealing member 61, thereby preventing the corrosion of the edge electrode layer 22.
[74]
The protective adhesive layer 50 may be any material preventing the direct contact between the flexible printed circuit board 40 and the first sealing member 61 and that is capable of securing sufficient adhesion between the flexible printed circuit board 40 and the first sealing member 61 without limitation.
[75]
In detail, the protective adhesive layer 50 may include one or more among acrylonitrile-butadiene rubber (NBR), polyester resin, acryl resin, epoxy resin, and polyimide resin. The protective adhesive layer 50 may be formed as one layer or two or more layers. When two or more types of the above-described protective adhesive layer 50 material are included, two or more types may be included in one layer or one or more materials may be included in two or more layers.
[76]
The protective adhesive layer 50 may further include one or more types of silicone adhesives and acrylic adhesives. At least one of the silicone adhesives and the acrylic adhesives may be included in addition to the above-described layer, or may be composed of a separate layer.
[77]
As the polyester resin, polyethylene terephthalate (PET) may be used.
[78]
An example of the detailed protective adhesive layer 50 may be a polyethylene terephthalate single layer, an acrylonitrile-butadiene rubber (NBR)/epoxy resin/epoxy resin triple layer, an acrylonitrile-butadiene rubber (NBR)/acryl resin/epoxy resin triple layer, an acrylonitrile-butadiene rubber (NBR)/epoxy resin/epoxy resin/PET quadruple layer, an acrylonitrile-butadiene rubber (NBR)/epoxy resin/epoxy resin/PET quadruple layer, an acryl resin single layer, an acryl resin/polyethylene terephthalate double layer, a polyester resin/silicone adhesive double layer, a polyimide resin/silicone adhesive double layer, a polyimide resin/acrylic adhesive double layer, or a polyimide resin/silicone adhesive/acrylic adhesive triple layer.
[79]
The protective adhesive layer 50 may have the thickness of 10 to 1000 μm. In this case, when the protective adhesive layer 50 is multi-layered with two or more layers, it means the sum of the thicknesses of the multi-layers. If the protective adhesive layer 50 is too thin, it may be difficult to achieve the purpose of preventing the corrosion of the edge electrode layer 22 described above. If the protective adhesive layer 50 is too thick, the edge electrode layer 22 may be damaged by a thickness step during the bonding using a sealing member.
[80]
The protective adhesive layer 50 may be formed to cover all of the edge electrode layer 22. Furthermore, the protective adhesive layer 50 may be formed to cover all of the anisotropic conductive adhesive layer 30 and the edge electrode layer 22.
[81]
FIG. 3 schematically shows the plane of the transparent display unit 100 according to an exemplary embodiment of the present invention. More specifically, FIG. 3 shows the plane of the transparent display unit 100 where the edge electrode layer 22 is disposed downwardly and the flexible printed circuit board 40 is disposed upwardly. As shown in FIG. 3, the anisotropic conductive adhesive layer 30 is disposed at the part where the edge electrode layer 22 and the flexible printed circuit board 40 are overlapping.
[82]
The protective adhesive layer 50 may extend beyond the bottom of the edge electrode layer 22. Specifically, the protective adhesive layer 50 may extend beyond the upper end of the anisotropic conductive adhesive layer 30 and beyond the lower end of the edge electrode layer 22. More specifically, the protective adhesive layer 50 may extend beyond the left end, the right end, and the upper end of the anisotropic conductive adhesive layer 30 and the lower end of the edge electrode layer 22.
[83]
FIG. 4 shows an enlarged plane of the transparent display unit 100 according to an exemplary embodiment of the present invention. Specifically, the dotted line circle part of FIG. 3 is enlarged and shown.
[84]
The protective adhesive layer 50 may extend by 1 mm or more from the lower end of the edge electrode layer 22 (C).
[85]
In addition, the protective adhesive layer 50 may extend by 1 mm or more from the left end and the right end of the anisotropic conductive adhesive layer 30 (B).
[86]
Further, the protective adhesive layer 50 may extend by 1 mm or more from the upper end of the anisotropic conductive adhesive layer 30 (A).
[87]
As such, the protective adhesive layer 50 is extended, thereby preventing the ingress of moisture into the edge electrode layer 22 through the first sealing member 61. If the protective adhesive layer 50 is not properly disposed such that moisture is partially penetrated into the edge electrode layer 22 through the first sealing member 61, positive ions (e.g. Cu 2+ ions) are produced at the edge electrode layer 22 and move into the flexible printed circuit board 40 through the edge portion of the anisotropic conductive adhesive layer 30, thereby corroding the edge electrode layer 22.
[88]
FIG. 6 shows a cross-section of the glass assembly 200 according to an exemplary embodiment of the present invention. The glass assembly 200 of FIG. 6 is merely to illustrate the present invention, and the present invention is not limited thereto. Thus the glass assembly 200 of FIG. 6 may be modified in various forms.
[89]
As shown in FIG. 6, the glass assembly 200 according to an exemplary embodiment of the present invention includes the transparent substrate film 10, the edge electrode layer 22 disposed on the upper surface of the transparent substrate film 10, the anisotropic conductive adhesive layer 30 disposed on the edge electrode layer, the flexible printed circuit board (FPCB) 40 disposed on the anisotropic conductive adhesive layer 30 and electrically connected to the edge electrode layer 22 through the anisotropic conductive adhesive layer 30, the protective adhesive layer 50 disposed on the flexible printed circuit board 40, the first sealing member 61 disposed on the protective adhesive layer 50, and the first glass sheet 71 disposed on the first sealing member 61.
[90]
The transparent substrate film 10, the edge electrode layer 22, the anisotropic conductive adhesive layer 30, the flexible printed circuit board 40, and the protective adhesive layer 50 described in the transparent display unit 100 are the same as these of the transparent display unit 100 described above such that the repeated description is omitted.
[91]
In the glass assembly 200 according to an exemplary embodiment of the present invention, the first sealing member 61 is the part disposed between the first glass sheet 71 and the transparent display unit 100 so that the first glass sheet 71 and the transparent display unit 100 are not separated from each other. In addition, the first sealing member 61 prevents the moisture or outside air such as oxygen from penetrating the transparent display unit 100.
[92]
The first sealing member 61 may be disposed on the entire surface of the first glass sheet 71. Alternatively, although not shown, the first sealing member 61 may be disposed on the edge of the first glass sheet 71.
[93]
The first sealing member 61 is formed of an optically transparent polymer so that external light may be incident without blocking the user's view. In detail, the first sealing member 61 may include one or more among polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), an ionoplast polymer, and polyurethane. For example, the first sealing member 61 may be formed of a PVB resin. In this case, the first sealing member 61 not only seals the transparent display unit 100 on the first glass sheet 71, but also blocks about 99 % or more of ultraviolet rays (UV) while blocking the external air.
[94]
The thickness of the first sealing member 61 is not particularly limited. However, if the thickness of the first sealing member 61 is too thick, a pressure may be applied to the transparent display unit 100 during the bonding process between the first glass sheet 71 and the transparent display unit 100, thereby causing cracks in the electrode layer or deteriorating light transmission. On the other hand, if the thickness of the first sealing member 61 is too thin, the sealing characteristic and the outside air preventing property may be deteriorated. Therefore, the thickness of the first sealing member 61 may be 0.2 to 0.8 mm.
[95]
When the first sealing member 61 and anisotropic conductive adhesive layer 30 are in direct contact, a reaction occurs at the electrode part of the flexible printed circuit board 40 and the edge electrode layer 22, thereby causing the corrosion. In the exemplary embodiment of the present invention, by forming the protective adhesive layer 50 on the upper surface of the flexible printed circuit board 40, the corrosion is prevented.
[96]
In the glass assembly 200 according to an exemplary embodiment of the present invention, the first glass sheet 71 is a plate member including a transparent polymer such as glass and/or polymethylmethacrylate (PMMA), polycarbonate (PC), etc., and may be colorless-transparent or colored-transparent. In this case, the first glass sheet 71 may have light transmittance of about 85 % or more.
[97]
The shape of the first glass sheet 71 may be a planar shape or a curved shape such as a bow, that is, a curved-surface shape. Here, when the first glass sheet 71 has the curved-surface shape, a curvature radius R may be about 0.2 to 0.3 m.
[98]
As shown in FIG. 6, a second sealing member 62 and a second glass sheet 72 may be further included at the lower surface 10 of the transparent substrate film, that is, the lower surface of the transparent display unit 100.
[99]
In the glass assembly 200 according to an exemplary embodiment of the present invention, the second sealing member 62 is the part disposed between the second glass sheet 72 and the transparent display unit 100, and prevents moisture or the outside air such as oxygen from being penetrated into the transparent display unit 100.
[100]
As shown in FIG. 6, 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 while protecting the light emitting diode 21 of the transparent display unit 100. On the other hand, although not shown, the second sealing member 62 may be disposed on the edge of the second glass sheet 72. In this case, a space is formed between the second glass sheet 72 and the transparent display unit 100 because of the second sealing member 62.
[101]
The second sealing member 62 is formed of an optically transparent polymer so that the external light may be incident without blocking the user's view. Specifically, the second sealing member 62 may include at least one type of polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), an ionoplast polymer, and polyurethane. As an example, the second sealing member 62 may be formed of a PVB resin. In this case, the second sealing member 62 not only seals the transparent display unit 100 on the second glass sheet 72, but also blocks about 99 % or more of the ultraviolet (UV) while blocking the external air.
[102]
The thickness of the second sealing member 62 is adjusted according to the height of the light emitting diode 21 in the transparent display unit 100. However, in order to protect the light emitting diode 21 of the transparent display unit 100 and to simultaneously not impair the light transmittance, a ratio D1/H1 of the thickness of the second sealing member 62 D1 to the height H1 of the light emitting diode 21 may be a 1.5 to 5 range.
[103]
The second glass sheet 72, like the first glass sheet 71, is also a plate member including a transparent polymer such as glass and/or polymethylmethacrylate (PMMA), polycarbonate (PC), etc., and may be colorless-transparent or colored-transparent. In this case, the second glass sheet 72 may have light transmittance of 85 % or more for visible rays. The second glass sheet 72 may have the same or different materials, colors, and/or light transmittance as the first glass sheet 71.
[104]
The shape of the second glass sheet 72 may be a planar shape or a curved shape such as a bow, that is, a curved-surface shape. Here, when the second glass sheet 72 has the curved-surface shape, a curvature radius R may be about 0.2 to 0.3 m.
[105]
In the glass assembly 200 according to an exemplary embodiment of the present invention, the transparent display unit 100 is a part interposed between the first glass sheet 71 and the second glass sheet 72 and displays the images and the characters. In addition, since the transparent display unit 100 has a yellowness index (YI) value of 3.0 or less, the external light may not only be incident, but also the visual transparency of the glass assembly 200 is not deteriorated and thus the user's view is not blocked.
[106]
In an exemplary embodiment of the present invention, there may be one transparent display unit 100. Also, as shown in FIG. 5, there may be multiple transparent display units 100. A plurality of transparent display units 100 may display one large image. That is, when a video signal is divided according to a predetermined screen division method in the LED driver, one large image is generated as a plurality of divided images, and then each divided image may be displayed through each corresponding transparent display unit 100.
[107]
The glass assembly 200 has light transmittance of about 70 to 80 % and light reflectance of about 8 to 15 % at a wavelength in the visible ray region (a wavelength of 400 to 700 nm). Particularly, when the glass assembly 200 according to the exemplary embodiment of the present invention has light transmittance of 70 % or more at the wavelength in the visible ray region and satisfies Equation 1 below, the visual field is not blocked by the electrode layer, perspective may be ensured inside or outside, and an appearance characteristic, electrical conductivity, and visual transparency may also be improved.
[108]
[Equation 1]
[109]
[110]
(In Equation 1, T represents light transmittance (%) of the glass assembly in the wavelength of the visible ray region, and RS represents sheet resistance (Ω/sq.) of the transparent electrode layer.))
[111]
According to an exemplary embodiment, the glass assembly 200 satisfies Equation 2 while having light transmittance of 70 % or more at the wavelength of the visible ray region. In this case, since the glass assembly 200 has excellent electrical conductivity, the power consumption is low and the heat is low, and also the visual transparency is secured so that a character or an image can be displayed more clearly.
[112]
[Equation 2]
[113]
[114]
(In Equation 2, T represents the light transmittance (%) of the glass assembly in the wavelength of the visible ray region, and RS represents the sheet resistance (Ω/sq.) of the electrode layer.)
[115]
In addition, by configuring the protective adhesive layer 50 on the upper surface of the flexible printed circuit board 40 in an exemplary embodiment of the present invention, the reaction and corrosion occurring between the edge electrode layer 22 and the flexible printed circuit board 40 are prevented.
[116]
Specifically, in the state that the current is applied to the edge electrode layer 22 and the flexible printed circuit board 40, when the glass assembly 200 is immersed in water at 100 ℃ for 48 hours, a corrosion rate may be 1 % or less. In this case, the corrosion rate refers to a weight of the corroded edge electrode layer 22 with respect to a weight of the entire edge electrode layer 22.
[117]
Hereinafter, the present invention is described in more detail through an experimental example. However, the experimental example is merely for illustrating the present invention, and the present invention is not limited thereto.
[118]
[Example 1]
[119]
1-1. Manufacturing of a transparent display unit
[120]
On one surface of a PET film substrate (size: 500 mmX600 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 inner electrode layer (sheet resistance: about 1 Ω/sq.). The edge electrode layer forms the circuit pattern with the copper line. Next, after forming silver (Ag) solder on the electrode layer through screen printing, a plurality of LEDs (height: about 1 mm) are mounted to each silver (Ag) solder by using low temperature SMT (surface mount technology). The anisotropic conductive adhesive layer (RA3351, manufactured by H&S Company) is formed at the edge portion of the electrode layer on which the LED is not mounted, and the flexible printed circuit board (FPCB) is stacked on the anisotropic conductive adhesive layer. Next, the protective adhesive layer (a silicone adhesive layer/PET double layer) is stacked to manufacture the transparent display unit.
[121]
1-2. Manufacturing of a glass assembly
[122]
On a first glass sheet, after sequentially stacking the transparent display unit manufactured in Example 1-1, the PVB resin film (thickness of 1.52 mm, Kuraray Butacite), and the second glass sheet, they are combined by applying a pressure of 11.5 bar at 130 ℃ to manufacture the glass assembly.
[123]
[Comparative Example 1]
[124]
In the manufacturing process of the transparent display unit, except that the protective adhesive layer is not formed on the flexible printed circuit board (FPCB), it is performed in the same manner as in Example 1.
[125]
[Experimental Example: corrosion rate estimation]
[126]
The glass assemblies manufactured in Example 1 and Comparative Example 1 are immersed in the state that the current is applied to the electrode layer and the flexible printed circuit (FPCB) in water at 100 ℃ for 48 hours, and corrosion rates are measured.
[127]
The corrosion rate is calculated as follows.
[128]
[a corroded electrode amount]/ [an entire electrode amount]
[129]
(Table 1)
[130]
[131]
As shown in Table 1, Example 1 in which the protective adhesive layer is formed is hardly corroded, but Comparative Example 1 confirms that the edge electrode layer is corroded by the reaction of the edge electrode layer.
[132]
FIG. 7 and FIG. 8 show photos of the edge electrode layer after estimating the corrosion of Example 1 and Comparative Example 1, respectively.
[133]
While this 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, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Therefore, the embodiments described above are only examples and should not be construed as being limitative in any respects.
[134]
<Description of symbols>
[135]
10: transparent substrate film,
[136]
21: light emitting diode,
[137]
22: edge electrode layer,
[138]
23: inner electrode layer,
[139]
30: anisotropic conductive adhesive layer,
[140]
40: flexible printed circuit board,
[141]
41: driving controller,
[142]
50: protective adhesive layer,
[143]
61: first sealing member,
[144]
62: second sealing member,
[145]
71: first glass sheet,
[146]
72: second glass sheet,
[147]
100: transparent display unit,
[148]
200: glass assembly

Claims

[Claim 1]
A transparent display unit comprising: a transparent substrate film; an edge electrode layer disposed on the upper surface of the transparent substrate film; an anisotropic conductive adhesive layer disposed on the edge electrode layer; a flexible printed circuit board (FPCB) disposed on the anisotropic conductive adhesive layer and electrically connected to the edge electrode layer through the anisotropic conductive adhesive layer; and a protective adhesive layer disposed on the flexible printed circuit board.
[Claim 2]
The transparent display unit of claim 1, wherein, with respect to a plane of the transparent display unit in which the edge electrode layer is disposed downwardly and the flexible printed circuit board is disposed upwardly, the protective adhesive layer extends beyond the lower end of the edge electrode layer.
[Claim 3]
The transparent display unit of claim 2, wherein the protective adhesive layer extends beyond the upper end of the anisotropic conductive adhesive layer.
[Claim 4]
The transparent display unit of claim 3, wherein the protective adhesive layer extends beyond the left end and the right end of the anisotropic conductive adhesive layer.
[Claim 5]
The transparent display unit of one of claims 1 to 4, further comprising a driving controller controlling the driving of the transparent display unit, and wherein the flexible printed circuit board electrically connects the edge electrode layer and the driving controller.
[Claim 6]
The transparent display unit of one of claims 1 to 5, wherein a ratio W/L of the entire width W of one or a plurality of flexible printed circuit boards to the edge length L of the transparent substrate film is 0.1 to 0.5.
[Claim 7]
The transparent display unit of one of claims 1 to 6, wherein the thickness of the transparent substrate film is 200 to 300 μm.
[Claim 8]
The transparent display unit of one of claims 1 to 7, wherein the edge electrode layer includes a circuit pattern formed of one or more among a metal line, a metallic nanowire, a transparent conductive oxide, a metal mesh, carbon nanotubes, and graphene.
[Claim 9]
The transparent display unit of one of claims 1 to 8, wherein the anisotropic conductive adhesive layer includes a resin and a conductive particle dispersed in the resin.
[Claim 10]
The transparent display unit of one of claims 1 to 9, wherein the protective adhesive layer includes one or more among an acrylonitrile-butadiene rubber (NBR), a polyester resin, an acryl resin, an epoxy resin, and a polyimide resin.
[Claim 11]
The transparent display unit of claim 10, wherein the protective adhesive layer further includes one or more of a silicone adhesive and an acrylic adhesive.
[Claim 12]
The transparent display unit of one of claims 1 to 11, wherein the protective adhesive layer has a thickness of 10 to 1000 μm.
[Claim 13]
A glass assembly comprising: a transparent substrate film; an edge electrode layer disposed on the upper surface of the transparent substrate film; an anisotropic conductive adhesive layer disposed on the edge electrode layer; a flexible printed circuit board (FPCB) disposed on the anisotropic conductive adhesive layer and electrically connected to the edge electrode layer through the anisotropic conductive adhesive layer; a protective adhesive layer disposed on the flexible printed circuit board; a first sealing member disposed on the protective adhesive layer; and a first glass sheet disposed on the first sealing member.
[Claim 14]
The glass assembly of claim 13, further comprising: a second sealing member disposed on the lower surface of the transparent substrate film; and a second glass sheet disposed on the lower surface of the second sealing member.
[Claim 15]
The glass assembly of claim 13 or 14, wherein the first sealing member includes one or more among polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), an ionoplast polymer, a cyclo olefin polymer (COP), and polyurethane.
[Claim 16]
The glass assembly of claim 14 or 15, wherein the second sealing member includes one or more among polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), an ionoplast polymer, a cyclo olefin polymer (COP), and polyurethane.
[Claim 17]
The glass assembly of one of claims 13 to 16, wherein in a state that a current is applied to the edge electrode layer and the flexible printed circuit board, when the glass assembly is immersed in water at 100 ℃ for 48 hours, a corrosion rate is 1 % or less.

Drawings

[ Fig. 1]

[ Fig. 2]

[ Fig. 3]

[ Fig. 4]

[ Fig. 5]

[ Fig. 6]

[ Fig. 7]

[ Fig. 8]