Large-area transparent reflective panel using nanoclusters and method of manufacturing the same

Abstract

To manufacture a large-area transparent reflection panel capable of increasing a scattering angle in the whole visible light region.SOLUTION: In a large-area transparent reflective panel using nanoclusters and a method of manufacturing the same, the transparent reflective panel includes a light-transmitting medium 10 and a plurality of metal clusters 100 formed on the light-transmitting medium 10. Each of the metal clusters 100 includes unit metal bodies 110 spaced apart from each other and formed on the light transmission medium 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a large-area transparent reflective panel using nanoclusters and a manufacturing method thereof, and more particularly to a large-area transparent reflective panel having scattering function by arranging clusters made of nano-sized unit metal bodies on a large-area glass substrate, and a manufacturing method thereof. [Background technology]

[0002] A transparent reflective panel is a reflective display in which the panel has a degree of transparency, allowing the surrounding background to be discerned and the projected image of the projector to be scattered.

[0003] Generally, transparent reflective panels have a small scattering angle because they are made of micro-scale structures that can scatter projected images into a transparent medium. That is, while conventional semi-transparent films can increase the amount of reflection at a specific angle by using micro diffraction gratings, the small scattering angle makes them difficult to function as a screen.

[0004] Therefore, many studies have been conducted on transparent reflective panels that can increase the scattering angle, such as Korean Patent No. 10-0949870, but satisfactory results have not yet been obtained. Summary of the Invention Problem to be solved

[0005] The present invention has been made in light of the above, and an object of the present invention is to provide a large-area transparent reflective panel that can increase the scattering angle over the entire visible light range.

[0006] Another object of the present invention is to provide a method for manufacturing the transparent reflective panel. [Means for solving the problem]

[0007] A transparent reflective panel according to one embodiment of the present invention includes a light-transmitting medium and a plurality of metal clusters formed on the light-transmitting medium, each of the metal clusters including unit metal bodies spaced apart from one another and formed on the light-transmitting medium.

[0008] The metal clusters are arranged at equal intervals in a first direction (X) and a second direction (Y) perpendicular to the first direction.

[0009] The metal clusters are arranged at intervals of 100 nm to 10 mm.

[0010] Each of the metal clusters has a boundary, and the unit metal bodies are arranged within the boundary of the metal cluster.

[0011] The metal cluster has a boundary with a rounded shape.

[0012] The size of the boundary of the round shape is 50 nm to 5 mm.

[0013] The unit metal bodies are randomly arranged within the boundaries of the metal cluster.

[0014] The size of the unit metal body is 10 nm to 10 μm.

[0015] In a method for manufacturing a transparent reflective panel according to another embodiment of the present invention for achieving the above-described object, a resin is applied to a mold having a plate on which a plurality of protrusions are formed so as to cover the protrusions. A film is formed on a first surface of the resin. The resin is solidified and then the mold is separated from the resin. A first metal layer is formed on a second surface of the resin that is exposed when the mold is separated. The first metal layer is pressed onto a second metal layer formed on a light-transmitting medium. The light-transmitting medium is heat-treated to melt the second metal layer. The light-transmitting medium is then removed, leaving the second metal layer on the first metal layer.

[0016] The first metal layer includes gold (Au), and the second metal layer includes silver (Ag).

[0017] Each of the protrusions has a cylindrical shape.

[0018] The protrusions are arranged at equal intervals from the first surface of the plate in a first direction (X) and in a second direction (Y) perpendicular to the first direction.

[0019] The film includes PET (polyethylene terephthalate).

[0020] In the step of heat treating the optically transparent medium to melt the second metal layer, the second metal layer in contact with the first metal layer is melted and adhered to the first metal layer.

[0021] By separating the mold from the resin, a plurality of spaces are formed in the resin by the protrusions.

[0022] In the step of forming a first metal layer on the second surface of the resin, the first metal layer is also formed on the space portion of the resin.

[0023] In the step of heat-treating the optically transparent medium to melt the second metal layer, the second metal layer opposite the first metal layer formed on the space portion is melted and formed as a unit metal body on the optically transparent medium.

[0024] The unit metal bodies are arranged on the light-transmitting medium at intervals due to the spacing of the spaces. [Effects of the Invention]

[0025] According to the present invention, it is possible to manufacture a large-area transparent reflective panel that can increase the scattering angle over the entire visible light range. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a plan view schematically showing a transparent reflective panel according to one embodiment of the present invention. [Figure 2] 2a to 2f are process diagrams showing a method for manufacturing the transparent reflective panel of FIG.

[0027] <Explanation of symbols>

[0028] 10: Light-transmitting medium 100: Metal cluster

[0029] 110: Unit metal body 210: Mold

[0030] 220: Resin 230: Film

[0031] 240: First metal layer 250: Specific details for implementing the second metal layer invention

[0032] While the present invention can be modified in various ways and can have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description, but it is not intended to limit the present invention to the specific embodiments, and it should be understood that the present invention includes all modifications, equivalents, and alternatives that fall within the spirit and technical scope of the present invention.

[0033] In describing the present invention, if a detailed description of related prior art is deemed to unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Furthermore, numbers (e.g., 1, 2, etc.) used in the description of this specification are merely identification symbols for distinguishing one element from another.

[0034] Furthermore, in this specification, when a component is referred to as being "coupled" or "connected" to another component, it should be understood that the component may be directly coupled or connected to the other component, but unless otherwise specified, it may also be coupled or connected via another component in between.

[0035] In addition, in this specification, a component expressed as a "part" may mean that two or more components are combined into one component, or one component may be divided into two or more components based on more specific functions. Furthermore, each of the components described below may perform part or all of the functions of other components in addition to its own main function, and some of the main functions of each component may be performed by other components.

[0036] Hereinafter, embodiments according to the technical concept of the present invention will be described in detail.

[0037] FIG. 1 is a plan view schematically showing a transparent reflective panel according to one embodiment of the present invention.

[0038] The transparent reflective panel according to this embodiment includes a light-transmitting medium 10 and metal clusters 100 formed on the light-transmitting medium 10 .

[0039] Here, the light-transmitting medium 10 is, for example, glass. However, the light-transmitting medium 10 is not limited and can be any material as long as it has light transmittance and does not change its physical properties or shape during heat treatment.

[0040] Each of the metal clusters 100 includes unit metal bodies 110 spaced apart from one another and formed on the optically transparent medium 10. Each of the unit metal bodies 110 has a randomly determined shape and contains, for example, silver (Ag). The shape of each unit metal body 110 is obtained through a heat treatment process, which will be described later, and the individual shapes are arbitrarily determined through the heat treatment process.

[0041] The metal clusters 100 are arranged at equal intervals (P) in a first direction (X) and a second direction (Y) perpendicular to the first direction (X). That is, since the metal clusters 100 are spaced apart at equal intervals in the first direction (X) and the second direction (Y), the metal clusters 100 are arranged in a regular square shape as a whole.

[0042] However, the spacing in the first direction (X) and the spacing in the second direction (Y) may be different from each other, so that the metal clusters 100 have an overall rectangular arrangement.

[0043] As shown, the metal cluster 100 has a boundary of a predetermined shape, where the boundary of the predetermined shape can be any of a variety of arbitrary shapes, and such arbitrary shaped boundary has a closed shape to form a predetermined region therein.

[0044] Furthermore, the arbitrary shape of the metal cluster 100 is, for example, a round shape, more specifically, a circular boundary. However, even if the boundary is circular, the unit metal body 110 contained therein does not have to have a fixed shape, so although the boundary can be circular as a whole, it is sufficient to have an approximately circular boundary rather than a perfect circle.

[0045] As described above, the unit metal bodies 110 are arranged within a circular boundary. The diameter of the circle at the circular boundary is determined by the diameter of the protrusions 213 in the manufacturing method described below. The unit metal bodies 110 are arranged randomly within the circular boundary.

[0046] Meanwhile, the metal clusters 100 are arranged at equal intervals (P) ranging from 100 nm to 10 mm in each of the first and second directions, the size (D) of the round-shaped boundary of the metal clusters 100 is 50 nm to 5 mm, and the size of the unit metal body 110 is 10 nm to 10 μm.

[0047] In this case, the size of the unit metal body 110 may be calculated as the intermediate value between the maximum and minimum values ​​measured in the linear distance, and the maximum value may be used.

[0048] As described above, when the unit metal bodies 110, which are nanoparticles, form the metal clusters 100, the scattering angle of the metal clusters 100, which resonate in the visible light band, is broadened by plasmon resonance, and the scattering angle becomes large across the entire visible light range.

[0049] The method for manufacturing the transparent reflective panel will be specifically described below.

[0050] 2a to 2f are process diagrams showing a method for manufacturing the transparent reflective panel of FIG.

[0051] First, as shown in Fig. 2a, a mold 210 is prepared in which a plurality of protrusions 213 are formed on a first surface 212 of a plate 211. Here, the first surface 212 is shown as the upper surface of the plate 211 in the drawing.

[0052] Each of the protrusions 213 has a cylindrical shape with a diameter (D), and the protrusions 213 are generally arranged at equal intervals (P) from one another in a first direction on the plane of the plate 211 and in a second direction perpendicular to the first direction. In this case, the mold 210 is made of, for example, a silicon material.

[0053] Meanwhile, the heights of the protrusions 213 are formed to be various, so that a sufficient separation distance is formed between the first metal layer 240 and the second metal layer 250 in the process described later, as shown in FIG. 2e. It is sufficient that the height of the space 223 formed by the protrusion is set as shown in FIG.

[0054] 2b, a liquid resin 220 is applied to the first surface 212 of the mold 210 so as to cover the protrusion 213. Here, the resin 220 must be applied to a thickness greater than the height of the protrusion 213, so that the resin 220 has a uniform thickness even on the upper surface of the protrusion 213.

[0055] The resin 220 solidifies over time. The resin 220 includes a second surface 223 that abuts against the first surface 212 of the mold 210 and a first surface 222 located opposite the second surface 223. In the drawings, the first surface 222 is shown as the upper surface of the resin 220, and the second surface 223 is shown as the lower surface of the resin 220.

[0056] 2b, a film 230 is formed on the first surface 222 of the resin 220. The film 230 is made of, for example, but not limited to, polyethylene terephthalate (PET) material. The film 230 serves as a base substrate that maintains the shape of the resin 220 when the mold 210 is separated.

[0057] The mold 210 is then separated from the solidified resin 220, as shown in Figure 2c.

[0058] As described above, when the mold 210 is separated from the resin 220, the shape of the protrusion 213 of the mold 210 is formed on the resin 220 in an inverted form.

[0059] 2c, when the mold 210 is separated from the resin 220, spaces 221 are formed in a recessed shape that reflects the protruding shape of the protrusions 213. Here, the separation distance between the spaces 221 is substantially the same as the spacing between the protrusions 213.

[0060] Next, as shown in FIG. 2d, a first metal layer 240 is formed on the second surface 223 of the resin 220.

[0061] Here, the second surface 223 of the resin 220 corresponds to the surface where the space 221 is formed as the protrusion 213 is removed. When the first metal layer 240 is formed on the second surface 223 of the resin 220, as shown in the figure, the first metal layer 240 is not only formed on the surface of the resin 220 that protrudes outward, but also the second metal layer 240 is simultaneously formed on the inner surface of the space 221 of the resin 220.

[0062] Here, the first metal layer 240 is made of a material mainly composed of gold (Au), but is not limited to this. The first metal layer 240 is attached to the resin 220 by various known methods such as evaporation or coating, and as described above, the first metal layer 240 fills the bottom of the space 221.

[0063] 2e, apart from forming the first metal layer 240 on the resin 220, a second metal layer 250 is formed on the first surface 12 of another light-transmitting medium 10. Here, the first surface 12 is shown as the upper surface of the light-transmitting medium 10 in the drawing. Here, the second metal layer 250 is made of a material whose main component is silver (Au), but is not limited to this.

[0064] Then, as shown in FIG. 2e, the resin 220 is pressed against the optically transparent medium 10.

[0065] Here, the surface of the resin 220 on which the first metal layer 240 is formed and the surface of the light-transmitting medium 10 on which the second metal layer 250 is formed are arranged opposite each other, and the resin 220 is pressed toward the light-transmitting medium 10.

[0066] As a result, the first metal layer 240 formed on the second surface 223 of the resin 220 comes into contact with the second metal layer 250 formed on the first surface 12 of the optically transparent medium 10, and the first metal layer 240 presses against the second metal layer 250.

[0067] In addition to the pressing step, a heat treatment step is also carried out.

[0068] By such heat treatment, the second metal layer 250 melts and solidifies and adheres to the first metal layer 240. During this process, the adhesion between the first metal layer 240 and the second metal layer 250 becomes stronger than the adhesion between the optically transmissive medium 10 and the second metal layer 250.

[0069] Here, it has been described that the second metal layer 250 is silver (Ag) and the first metal layer 240 is gold (Au), but the materials of the first metal layer 240 and the second metal layer 250 can also be selected so that the melting point of the second metal layer 250 is lower than the melting point of the first metal layer 240.

[0070] On the other hand, when the heat treatment process is performed, the second metal layer 250, which corresponds to the space 221 of the resin 220, i.e., faces the first metal layer 240 formed in the space 221 of the resin 220, and is spaced a predetermined distance from the first metal layer 240 due to the recession of the space 221, is melted on the light-transmitting medium 10.

[0071] In this manner, as the second metal layer 250 is melted on the light-transmitting medium 10, the second metal layer 250 can be formed of unit metal bodies 110 that are randomly arranged and spaced apart from one another.

[0072] Here, the unit metal body 110 can be formed only within the diameter of the space 221. Meanwhile, the diameter of the space 221 can be said to be substantially the same as the diameter of the protrusion 213 in the above process, and therefore, the diameter within which the unit metal body 110 is formed can be said to be within the diameter range of the protrusion 213.

[0073] The resin 220 is then separated from the optically transparent medium 10 and removed, as shown in FIG. 2f.

[0074] In this case, as described above, the adhesion between the first metal layer 240 and the second metal layer 250 due to the heat treatment becomes greater than the adhesion between the second metal layer 250 and the optically transparent medium 10, and the second metal layer 250 attached to the first metal layer 240 is separated from the optically transparent medium 10.

[0075] The melted second metal layer 250 corresponding to the space 221 remains as it is on the light-transmitting medium 10 and is formed of the unit metal body 110 .

[0076] Thus, as shown in FIG. 1, unit metal bodies 110 are formed on the light-transmitting medium 10, and the shape and arrangement of these unit metal bodies 110 are the same as those described above.

[0077] According to the present invention, it is possible to manufacture a large-area transparent reflective panel that can increase the scattering angle over the entire visible light range.

[0078] The foregoing description sets forth the best mode of the invention and, to illustrate the invention, The present invention has been described in detail with reference to the examples set forth above, and examples are provided to enable one skilled in the art to make and use the invention. The specification written in this manner does not intend to limit the invention to the specific terms set forth therein. While the present invention has been described in detail with reference to the examples set forth above, those skilled in the art may make modifications, changes, and variations to the examples without departing from the scope of the present invention.

Claims

1. an optically transparent medium; a plurality of metal clusters formed on the optically transparent medium; The transparent reflective panel, wherein each of the metal clusters includes unit metal bodies formed on the light-transmitting medium in a state spaced apart from each other.

2. 2. The transparent reflective panel of claim 1, wherein the metal clusters are arranged at equal intervals in a first direction (X) and a second direction (Y) perpendicular to the first direction.

3. 3. The transparent reflective panel according to claim 2, wherein the metal clusters are arranged at intervals of 100 nm to 10 mm.

4. each of the metal clusters has a boundary; The transparent reflective panel according to claim 2 , wherein the unit metal bodies are arranged within the boundaries of the metal clusters.

5. The transparent reflective panel according to claim 4 , wherein the boundaries of the metal clusters are rounded.

6. The transparent reflective panel according to claim 5, wherein the size of the boundary of the round shape is 50 nm to 5 mm.

7. The transparent reflective panel according to claim 4 , wherein the unit metal bodies are randomly arranged within the boundaries of the metal clusters.

8. 2. The method according to claim 1, wherein the size of the unit metal body is 10 nm to 10 μm. The transparent reflective panel described above.

9. applying a resin to a mold having a plate on which a plurality of protrusions are formed so as to cover the protrusions; forming a film on a first surface of the resin; separating the mold from the resin after the resin has solidified; forming a first metal layer on a second surface of the resin that is exposed to the outside as the mold is separated; pressing the first metal layer onto a second metal layer formed on an optically transparent medium; heat treating the optically transparent medium to melt the second metal layer; removing the light-transmitting medium so that the second metal layer remains on the first metal layer.

10. 10. The method for manufacturing a transparent reflective panel according to claim 9, wherein the first metal layer contains gold (Au), and the second metal layer contains silver (Ag).

11. The method for manufacturing a transparent reflective panel according to claim 9 , wherein each of the protrusions has a cylindrical shape.

12. 10. The method for manufacturing a transparent reflective panel according to claim 9, wherein the protrusions are arranged at equal intervals in a first direction (X) from the first surface of the plate and in a second direction (Y) perpendicular to the first direction.

13. The method for manufacturing a transparent reflective panel according to claim 9 , wherein the film comprises PET.

14. In the step of heat treating the optically transparent medium to melt the second metal layer, 10. The method for manufacturing a transparent reflective panel according to claim 9, wherein the second metal layer in contact with the first metal layer is melted and attached to the first metal layer.

15. The method for manufacturing a transparent reflective panel according to claim 9 , wherein a plurality of spaces are formed in the resin by the protrusions when the mold is separated from the resin.

16. forming a first metal layer on the second surface of the resin; The method for manufacturing a transparent reflective panel according to claim 15, wherein the first metal layer is also formed on the space portion of the resin.

17. In the step of heat treating the optically transparent medium to melt the second metal layer, The method for manufacturing a transparent reflective panel according to claim 16, wherein the second metal layer opposite the first metal layer formed on the space portion is melted and formed as a unit metal body on the light-transmitting medium.

18. The method for manufacturing a transparent reflective panel according to claim 17, wherein the unit metal bodies are arranged on the light-transmitting medium at intervals due to the spacing of the spaces.

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