Large-area transparent reflective panel using nanoclusters and its manufacturing method

Abstract

In the large-area transparent reflective panel using nanoclusters and the manufacturing method thereof, the transparent reflective panel includes a light-transmitting medium and a plurality of metal clusters formed on the light-transmitting medium, where each of the metal clusters includes unit metal bodies formed on the light-transmitting medium in a state spaced apart from each other.

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 a 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 while scattering the image projected by the projector.

[0003] Generally, a transparent reflective panel has a small scattering angle because it is made of a micro-scale structure that can scatter a projected image into a transparent medium. That is, although a conventional semi-transparent film can increase the amount of reflection at a specific angle by using a micro diffraction grating, it has a small scattering angle and is therefore difficult to function as a screen.

[0004] Accordingly, there have been many studies on transparent reflective panels capable of increasing the scattering angle, such as Korean Patent No. 10-0949870, but satisfactory results have yet to be obtained. Summary of the Invention Problem to be solved

[0005] The present invention has been made in light of the above-mentioned problem, and an object of the present invention is to provide a large-area transparent reflective panel capable of increasing 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 an 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 in 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 that is rounded.

[0012] The border size of the round shape is between 50 nm and 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 an embodiment of the present invention for achieving the other object described above, 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 to the outside as 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 removed, so that the second metal layer remains 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 a 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 polyethylene terephthalate (PET).

[0020] In a 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 light-transmitting medium and melting the second metal layer, the second metal layer facing the first metal layer formed on the space portion is melted and formed as a unit metal body on the light-transmitting medium.

[0024] The unit metal bodies are arranged spaced apart from one another on the light-transmitting medium by the spacing of the spaces. Effect of the Invention

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

[0026] [Figure 1] FIG. 1 is a plan view that illustrates a schematic configuration of a transparent reflective panel according to one embodiment of the present invention. [Diagram 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 carrying out the second metal layer invention

[0032] The present invention can be modified in various ways and can have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this 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 included in 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. In addition, numbers (e.g., 1, 2, etc.) used in the description of this specification are merely identification symbols for distinguishing one component from another.

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

[0035] In addition, in this specification, a component expressed as "part" may be two or more components combined into one component, or one component may be divided into two or more components according to more specific functions. In addition, each of the components described below may perform a part or all of the functions of other components in addition to its 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 that illustrates a schematic configuration of 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 that 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 light-transmitting medium 10. Here, each of the unit metal bodies 110 has a randomly determined shape and includes, for example, silver (Ag). Here, the shape of the unit metal bodies 110 is obtained in a heat treatment process described below, and the individual shapes are arbitrarily determined by 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 have an arrangement in the shape of a regular square as a whole.

[0042] However, instead, 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] Metal cluster 100, as shown, 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 so as to form a predetermined region therein.

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

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

[0046] Meanwhile, the metal clusters 100 are arranged at equal intervals (P) ranging from 100 nm to 10 mm in each of the first direction and the second direction, 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 ​​of the linear distance measurements, and the maximum value may be used.

[0048] As described above, when the unit metal bodies 110, which are nanoparticles, form the metal cluster 100, the scattering angle of the metal cluster 100, which resonates in the visible light band, is broadened by plasmon resonance, and the scattering angle becomes large over 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] 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 having a diameter (D), and the protrusions 213 are generally arranged at equal intervals (P) from each other 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] On the other hand, the heights of the respective protrusions 213 are formed to be various, and in the process described below, it is sufficient that the height of the space 223 formed by the protrusions is formed so that a sufficient separation distance is formed between the first metal layer 240 and the second metal layer 250, as in Figure 2e.

[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 have a thickness greater than the height of the protrusion 213, so that the resin 220 has a certain 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, a 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 FIG. 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 inverted and formed on the resin 220.

[0059] 2c, when the mold 210 is separated from the resin 220, the 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 interval between the protrusions 213.

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

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

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

[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 mainly composed of silver (Au), but is not limited thereto.

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

[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 towards 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 light-transmissive 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 is solidified and attached 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), however, 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 separated from the first metal layer 240 by a predetermined distance 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 may be formed of unit metal bodies 110 that are randomly arranged while being spaced apart from one another.

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

[0073] The resin 220 is then separated from the optically transmissive 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 light-transmitting medium 10, and the second metal layer 250 attached to the first metal layer 240 is separated from the light-transmitting medium 10.

[0075] Moreover, the melted second metal layer 250 corresponding to the space 221 remains as it is on the light transmissive 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 the 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 capable of increasing the scattering angle over the entire visible light range.

[0078] The foregoing description sets forth the best mode of the invention and provides examples to describe the invention and to enable one skilled in the art to make and use the invention. The specification so written is not intended to limit the invention to the specific terms set forth. Thus, although the invention has been described in detail with reference to the foregoing examples, those skilled in the art may make modifications, changes, and variations thereto without departing from the scope of the invention.

Claims

1. A light-transmitting medium; a plurality of metal clusters formed on the optically transparent medium; The transparent reflective panel according to claim 1, wherein each of the metal clusters includes unit metal bodies spaced apart from each other and formed on the light-transmitting medium.

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 from 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 transparent reflective panel according to claim 1, wherein the size of the unit metal body is in the range of 10 nm to 10 μm.

9. A step of 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 includes gold (Au) and the second metal layer includes 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 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 facing 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 of claim 17, wherein the unit metal bodies are arranged spaced apart from one another on the light-transmitting medium by the spacing of the spaces.

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