阅读说明：本技术 装饰构件及其制备方法 (Decorative member and method for producing same ) 是由 金容赞 金起焕 孙政佑 章盛晧 曹弼盛 许南瑟雅 于 2018-06-27 设计创作，主要内容包括：本公开涉及一种装饰构件,所述装饰构件包括：光反射层；以及光吸收层,所述光吸收层设置在所述光反射层上,其中,所述光反射层具有20欧姆/平方以下的表面电阻。(The present disclosure relates to a decoration member, including: a light reflecting layer; and a light absorbing layer disposed on the light reflecting layer, wherein the light reflecting layer has a surface resistance of 20 ohm/square or less.)

1. A trim member comprising:

a light reflecting layer; and

a light absorbing layer disposed on the light reflecting layer,

wherein the light reflecting layer has a surface resistance of 20 ohm/square or less.

2. The decoration member according to claim 1, wherein the light reflection layer has a surface resistance of 10 ohm/square or less.

3. The decoration member according to claim 1 wherein the light reflection layer is a single layer or a multilayer, and comprises one or more materials selected from indium (In), tin (Sn), silicon (Si), germanium (Ge), aluminum (Al), copper (Cu), nickel (Ni), vanadium (V), tungsten (W), tantalum (Ta), molybdenum (Mo), neodymium (Nd), titanium (Ti), iron (Fe), chromium (Cr), cobalt (Co), gold (Au), and silver (Ag), or an oxide, nitride, or oxynitride thereof, and one or more materials selected from carbon and carbon composite.

4. The decoration member according to claim 1, further comprising a color film, wherein the color film is provided at:

a surface of the light absorbing layer such that the light absorbing layer is between the color film and the light reflecting layer; or

Between the light reflecting layer and the light absorbing layer; or

A surface of the light reflecting layer such that the light reflecting layer is between the color film and the light absorbing layer.

5. The trim member of claim 4, further comprising a substrate, wherein the substrate is disposed between:

a surface of the light reflecting layer, wherein the colored film is disposed between the light reflecting layer and the light absorbing layer; or

A surface of the light reflecting layer, wherein the light absorbing layer is between the color film and the light reflecting layer; or

Between the light reflecting layer and the color film; or

A surface of the color film, wherein the light reflecting layer is between the color film and the light absorbing layer.

6. The decoration member according to claim 1 wherein, the light absorption layer includes two or more dots having different thicknesses.

7. The decoration member according to claim 1 wherein the light absorption layer includes at least one region in which the upper surface is inclined at an angle greater than 0 degree and less than or equal to 90 degrees, and the light absorption layer includes at least one region having a thickness different from that in any one region having the inclined surface.

8. The garment of claim 1A decorative member, wherein the light absorbing layer has Δ E^*ab>1, dichroism.

9. The decoration member according to claim 1 wherein, the upper surface of the light absorption layer comprises:

a pattern having tapered protrusions or grooves, wherein an upper surface of the tapered protrusions or grooves is cut; or

Including a pattern of protrusions having a linear shape at their highest points or grooves having a linear shape at their lowest points.

10. The garnish member according to claim 9, wherein when the pattern having the tapered protrusions or grooves is viewed while rotating the pattern around the apex of the tapered protrusions by 360 degrees, the tapered pattern has two or less protrusions or grooves having the same shape.

11. The garnish member according to claim 9, wherein the pattern has only one shape when the upper surface of the pattern including the protrusion whose highest point has a linear shape or the groove whose lowest point has a linear shape is viewed while rotating the pattern by 360 degrees around the center of gravity of the upper surface.

12. The decoration member according to claim 1 wherein, the light absorption layer has a refractive index of 0 to 8at 400 nm.

13. The decoration member according to claim 1 wherein, the light absorption layer has an extinction coefficient of more than 0 and less than or equal to 4 at 400 nm.

14. The decoration member according to claim 1 wherein the light absorption layer is a single layer or a multilayer comprising one or more materials selected from indium (In), titanium (Ti), tin (Sn), silicon (Si), germanium (Ge), aluminum (Al), copper (Cu), nickel (Ni), vanadium (V), tungsten (W), tantalum (Ta), molybdenum (Mo), neodymium (Nd), iron (Fe), chromium (Cr), cobalt (Co), gold (Au), and silver (Ag) or an oxide, nitride, or oxynitride thereof.

15. The decoration member according to any one of claims 1 to 14, which is a decoration film or a case of a mobile device.

Technical Field

The present application claims the priority and benefit of korean patent application No. 10-2017-.

The present disclosure relates to a decorative member and a method of manufacturing the same. In particular, the present disclosure relates to a decoration member suitable for mobile devices or electronic products, and a method of preparing the same.

Background

For mobile phones, various mobile devices, and electronic products, product designs such as colors, shapes, and patterns play an important role in providing product value to customers, in addition to product functions. Product preferences and price also depend on the design.

Taking a mobile phone as an example, various methods are used to obtain various colors and color senses (colorsense) and are used in products. A method of providing a color to the mobile phone case material itself or a method of providing a design by attaching a decorative film realizing a color and a shape to the case material may be included.

In the existing decorative film, there has been an attempt to develop color by a method such as printing and deposition. When different colors (heterocolors) are expressed on a single surface, two or more times of printing are required, and when various colors are applied to a three-dimensional pattern, realization is hardly realistic. In addition, the existing decorative film has a fixed color according to a viewing angle, and even when there is a slight change, the change is limited only to a difference in color perception.

Disclosure of Invention

Technical problem

The present disclosure is directed to providing a decoration member capable of blocking electromagnetic interference (EMI) and easily obtaining various colors due to a laminated structure of a light reflection layer and a light absorption layer.

Technical scheme

One embodiment of the present application provides a decoration element including: a light reflecting layer; and a light absorbing layer disposed on the light reflecting layer, wherein the light reflecting layer has a surface resistance of 20 ohm/square or less.

According to another embodiment of the present application, the color film (color film) is further provided at: a surface of the light reflecting layer opposite to a surface facing the light absorbing layer; between the light reflecting layer and the light absorbing layer; or on a surface of the light absorbing layer opposite to a surface facing the light reflecting layer. The color film adopts a color difference Δ E of more than 1 when the color film is present, as compared with when the color film is not provided^*ab, i.e. the distance in space of the color coordinates CIE L a b in the color-rendering layer.

In this specification, the light absorbing layer may be represented as the color developing layer.

According to another embodiment of the present application, a substrate is provided: a surface of the light reflecting layer opposite to a surface facing the light absorbing layer; or on a surface of the light absorbing layer opposite to a surface facing the light reflecting layer. For example, when the substrate is disposed on a surface of the light reflection layer opposite to a surface facing the light absorption layer and the color film is located on a surface of the light reflection layer opposite to a surface facing the light absorption layer, the color film may be disposed between the substrate and the light reflection layer or on a surface of the substrate opposite to a surface facing the light reflection layer. As another example, when the substrate is disposed on a surface of the light absorbing layer opposite to a surface facing the light reflecting layer and the color film is on a surface of the light absorbing layer opposite to a surface facing the light reflecting layer, the color film may be disposed between the substrate and the light absorbing layer or on a surface of the substrate opposite to a surface facing the light absorbing layer.

According to another embodiment of the present application, a substrate is further disposed on a surface of the light absorbing layer opposite to a surface facing the light reflecting layer, and the color film may be disposed between the light absorbing layer and the substrate, or on a surface of the substrate opposite to a surface facing the light absorbing layer, or between the light reflecting layer and the substrate, or on a surface of the substrate opposite to a surface facing the light reflecting layer.

According to another embodiment of the present application, the light absorbing layer includes more than two dots having different thicknesses.

According to another embodiment of the present application, the light absorbing layer includes more than two regions having different thicknesses.

According to another embodiment of the present application, the light absorbing layer includes one or more regions in which the upper surface has an inclined surface having an inclination angle greater than 0 degrees and less than or equal to 90 degrees, and the light absorbing layer includes one or more regions having a thickness different from that in any one region having the inclined surface.

According to another embodiment of the present application, the light absorbing layer includes one or more regions having a gradually varying thickness.

According to another embodiment of the present application, the light absorbing layer includes one or more regions in which the upper surface has an inclined surface having an inclination angle greater than 0 degree and less than or equal to 90 degrees, and at least one region having the inclined surface has a structure in which a thickness of the light absorbing layer gradually changes.

According to another embodiment of the present application, the light absorbing layer has an extinction coefficient (k) value of greater than 0 and less than or equal to 4, preferably 0.01 to 4, at 400 nm.

According to another embodiment of the present application, the decoration member is a decoration film, a case of a mobile device, a case of an electronic product, or an article requiring color decoration.

Advantageous effects

According to the embodiments described in the present specification, light absorption occurs in each of an entrance path when external light enters through the color-developing layer and a reflection path when the external light is reflected, and since the external light is reflected on each of the light absorption layer surface and the light reflection layer surface, constructive and destructive interference phenomena occur between the reflected light on the light absorption layer surface and the reflected light on the light reflection layer surface. A specific color can be displayed by such light absorption in the incoming path and the reflected path and constructive and destructive interference phenomena. In addition, since the displayed color depends on the thickness, the color may vary depending on the thickness even with the same material composition. In addition to this, by using a light reflection layer having a surface resistance in a specific range while having a light reflection property as a light reflection layer in a laminated structure of the light reflection layer and the light absorption layer, it is possible to provide a decorative member capable of blocking electromagnetic interference (EMI). As a result, when an electronic device to which the decoration member is applied is used, electromagnetic waves harmful to a human body can be blocked.

Drawings

Fig. 1 is a simulation diagram for describing the operation principle of color development in the light reflection layer and light absorption layer structure.

Fig. 2 shows an electromagnetic interference shielding characteristic according to a surface resistance.

Fig. 3 to 6 illustrate a laminated structure of a decoration member according to an embodiment of the present application.

Fig. 7 to 10 illustrate an upper surface structure of a light absorbing layer of a decoration member according to an embodiment of the present application.

Fig. 11 to 14 illustrate a laminated structure of a decoration member according to an embodiment of the present disclosure.

FIG. 15 is a graph showing different N in forming aluminum oxynitride₂A plot of the reflectivity of the partial pressure aluminum oxynitride layer.

Fig. 16 shows characteristics of aluminum oxynitride which can be used as a material of the light reflective layer.

Fig. 17 shows the optical simulation results of example 3 and example 4.

Fig. 18 is a diagram illustrating a method of distinguishing between a light absorbing layer and a light reflecting layer.

Detailed Description

The present disclosure will be described in detail below.

In this specification, "dot" means one position having no area. In this specification, the expression is used to indicate that the light absorbing layer has two or more points having different thicknesses.

In the present specification, "region" means a portion having a specific area. For example, when the decoration member is placed on the ground such that the light reflection layer is placed at the bottom and the light absorption layer is placed at the top, and both ends of the inclined surface or both ends of the same thickness perpendicular to the ground are separated, the region having the inclined surface means a region divided by both ends of the inclined surface, and the region of the same thickness means a region divided by both ends of the same thickness.

In the present specification, a "surface" or "region" may be a flat surface, but is not limited thereto, and a part or all may be a curved surface. For example, a structure in which a vertical sectional shape is a part of an arc of a circle or an ellipse, a wave structure, a zigzag shape, or the like may be included.

In the present specification, the "inclined surface" refers to a surface that forms an angle of more than 0 degrees and less than or equal to 90 degrees with respect to the ground surface by the upper surface when the decoration member is placed on the ground surface such that the light reflection layer is placed at the bottom and the light absorption layer is placed at the top.

In the present specification, the "thickness" of a certain layer means the shortest distance from the lower surface to the upper surface of the corresponding layer.

In this specification, unless otherwise defined, "or" means to include the listed conditions, either selectively or collectively, i.e., the meaning of "and/or".

In the present specification, "layer" means covering 70% or more of the area where the corresponding layer is present. This means that preferably more than 75%, more preferably more than 80% is covered.

In the present specification, the surface resistance can be measured according to the 4-point probe method using a known chip resistor. As for the surface resistance, a resistance value (V/I) was measured by measuring a current (I) and a voltage (V) using 4 probes, and a surface resistance (V/I × W/L) was obtained by using an area (unit area, W) of a sample and a distance (L) between electrodes for measuring resistance, and then multiplied by a Resistance Correction Factor (RCF), thereby calculating a surface resistance unit ohm/square. The resistance correction factor may be calculated using the sample size, the sample thickness, and the temperature at the time of measurement, and may be calculated using a poisson equation. The surface resistance of the entire laminate may be measured and calculated from the laminate itself, and the surface resistance of each layer may be measured before forming the layer formed of the remaining material (except for the target layer measured from the entire laminate), the surface resistance of each layer may be measured after removing the layer formed of the remaining material (except for the target layer measured from the entire laminate), or the surface resistance of each layer may be measured by analyzing the material of the target layer and then forming the layer under the same conditions as the target layer.

A decoration member according to an embodiment of the present application includes a light reflection layer; and a light absorbing layer disposed on the light reflecting layer, wherein the light reflecting layer has a surface resistance of 20 ohm/square or less. In such a structure, the decorative member can exhibit a specific color when viewed from the light absorbing layer side.

The decoration member having such a configuration has a characteristic capable of blocking electromagnetic interference (EMI). With the development of electronic communication, more electromagnetic waves are inevitably used. Therefore, electromagnetic interference (EMI) is a problem that cannot be ignored any more, and research on its harm to the human body is continuously ongoing. In view of the above, EMI regulations in home appliances and communication equipment are strengthened, and materials for blocking electromagnetic waves (EMI; electromagnetic waves, NIR; near infrared, neon) emitted from LCDs and OLEDs, which are harmful to the human body, have been required, resulting in a rapid increase in demand therefor. As such market expands, such an electromagnetic wave shielding material according to an embodiment of the present disclosure is mounted as a decorative member, for example, in the form of a decorative film, for driving a device including a display (i.e., an electronic device that emits a large amount of electromagnetic waves due to its characteristics), and can effectively shield leakage of electromagnetic waves. Fig. 2 shows the relationship between the sheet resistance and the EMI shielding characteristics.

In order to have an electromagnetic wave shielding function, the surface resistance of the light reflection layer of the decorative member of the present disclosure is 20 ohm/square or less, preferably less than 20 ohm/square.

According to one embodiment, the light reflection layer has a value of 20dB or more, and may have a surface resistance of 10 ohm/square or less. For example, the light reflecting layer may have a surface resistance of 1 ohm/square or less. The surface resistance of the light reflection layer is preferably as low as possible for electromagnetic wave shielding interference. For example, the light reflecting layer may have a surface resistance of 0.1 ohm/square or more.

The light reflection layer is not particularly limited as long as it is a material capable of reflecting light and is capable of having the above-described surface resistance in a given thickness or structure of the light reflection layer. The light reflectance may be determined according to materials, for example, colors are easily expressed at a light reflectance of 50% or more. The light reflectance can be measured using an ellipsometer (ellipsometer).

As one example, the light reflection layer may be a single layer or a multilayer including one or more materials selected from indium (In), titanium (Ti), tin (Sn), silicon (Si), germanium (Ge), aluminum (Al), copper (Cu), nickel (Ni), vanadium (V), tungsten (W), tantalum (Ta), molybdenum (Mo), neodymium (Nd), iron (Fe), chromium (Cr), cobalt (Co), gold (Au), and silver (Ag) or an oxide, nitride, or oxynitride thereof, and one or more materials of carbon and carbon composite. For example, the light reflecting layer may include two or more alloys selected from the above materials, or an oxide, nitride, or oxynitride thereof. According to another embodiment, the light reflective layer may be implemented by being prepared using an ink containing carbon or a carbon composite. Carbon black, CNT, and the like may be included as carbon or carbon composites. The ink containing carbon or a carbon composite may contain the above-mentioned material or an oxide, nitride or oxynitride thereof, and for example, may contain a material selected from indium (In), titanium (Ti), tin (Sn), silicon (Si), germanium (Ge). One or more oxides of aluminum (Al), copper (Cu), nickel (Ni), vanadium (V), tungsten (W), tantalum (Ta), molybdenum (Mo), neodymium (Nd), iron (Fe), chromium (Cr), cobalt (Co), gold (Au), and silver (Ag). After printing the ink comprising carbon or carbon composites, a curing process may also be performed.

When the light reflection layer includes two or more materials, one process (e.g., a method of deposition or printing) may be used to form the two or more materials, however, a method of first forming a layer using one or more materials and then additionally forming a layer on the layer using one or more materials may be used. For example, the light reflective layer may be formed by depositing indium or tin to form a layer, then printing an ink containing carbon, and then curing the resultant. The ink may also contain an oxide, such as titanium oxide or silicon oxide.

For example, when aluminum oxynitride is used, by having a composition of 57 at% to 60 at% of aluminum (Al), 3 at% to 8 at% of oxygen (O), and 35 at% to 38 at% of nitrogen (N) in the layer, the following relational expression can be satisfied. As a specific example, the value of the following relational expression may be 1.4 to 1.5. According to one embodiment, at N₂The flow rate is less than 6sccm (N)₂Partial pressure of 6%) may satisfy a surface resistance (Rs) range of less than 20 ohms/square. In FIG. 15, the difference N in forming the aluminum oxynitride layer is shown₂The reflectivity of the partial pressure aluminum oxynitride layer. More specifically, the material of fig. 16 may be used as the material of the light reflecting layer. N of FIG. 16₂The flow rate represents the reaction gas N for forming aluminum oxynitride₂And the color is the color observed from the light reflecting layer.

The relation is as follows:

the light absorbing layer preferably has a refractive index (n) of 0 to 8at 400nm, and the refractive index may be 0 to 7, may be 0.01 to 3, and may be 2 to 2.5. The refractive index (n) can be calculated by sin θ 1/sin θ 2(θ 1 is the angle of light incident on the surface of the light absorbing layer, θ 2 is the refraction angle of light inside the light absorbing layer).

The light absorbing layer preferably has a refractive index (n) of 0 to 8at 380nm to 780nm, and the refractive index may be 0 to 7, may be 0.01 to 3, and may be 2 to 2.5.

The light absorbing layer may have an extinction coefficient (k) of greater than 0 and less than or equal to 4 at 400nm, and the extinction coefficient (k) is preferably 0.01 to 4, may be 0.01 to 3.5, may be 0.01 to 3, and may be 0.1 to 1. The extinction coefficient (k) is- λ/4 π I (dI/dx) (here, the value obtained by multiplying λ/4 π by dI/I, and the reduced fraction of the light intensity per unit length (dx) (e.g., 1m) of the light absorption layer, where λ is the wavelength of the light).

The light absorbing layer may have an extinction coefficient (k) of greater than 0 and less than or equal to 4 (preferably 0.01 to 4) at 380nm to 780nm, and the extinction coefficient (k) is preferably 0.01 to 4, may be 0.01 to 3.5, may be 0.01 to 3, and may be 0.1 to 1.

The extinction coefficient (k) is in the above range at 400nm, preferably in the entire visible wavelength region of 380nm to 780nm, and therefore, the action of the light absorbing layer can be performed in the visible light range. Even when having the same value of the refractive index (n), when the value of the extinction coefficient (k) at 400nm is 0 and when the value of the extinction coefficient (k) is 0.01, it is possible to obtain

The difference of (a). For example, when a case where D65 (solar spectrum) was irradiated as a light source on the laminated structure of glass/light reflecting layer/light absorbing layer/air layer was simulated, Δ E ab values when the k value of the light absorbing layer was 0 and 0.01 were obtained as shown in table 1 below. Here, the thickness (h1) of the light reflecting layer was 120nm, and the thickness (h2) of the light absorbing layer was described in table 1 below. The k value in the simulation was arbitrarily set to 0 and 0.01, and the value of aluminum was used as the n value.

[ TABLE 1]

For example, a method of absorbing light by adding a dye to a resin is used, and use of a material having an extinction coefficient as described above results in a different light absorption spectrum. When light is absorbed by adding a dye to a resin, the absorption wavelength band is fixed, and only a phenomenon occurs in which the absorption amount changes according to a change in the thickness of the coating layer. In addition, in order to obtain a target light absorption amount, it is necessary to change the thickness of at least several micrometers or more to adjust the light absorption amount. On the other hand, in a material having an extinction coefficient, even if the thickness varies by several to several tens of nanometers, the wavelength band of absorbed light changes.

According to one embodiment, the light absorbing layer may be a single layer, or a multilayer of two or more layers.

The light absorbing layer may be formed of a material having an extinction coefficient (k) at 400nm (preferably 380nm to 780nm), that is, a material having an extinction coefficient greater than 0 and less than or equal to 4, preferably 0.01 to 4. For example, the light absorbing layer may include one or more selected from the group consisting of a metal, a metalloid (metalloid), and an oxide, nitride, oxynitride and carbide of the metal or metalloid. Oxides, nitrides, oxynitrides, or carbides of metals or metalloids may be formed under deposition conditions, etc., set by those skilled in the art. The light absorbing layer may further include two or more types of metals, metalloids, alloys, or oxynitrides, which are the same as the light reflecting layer.

For example, the light absorbing layer may be a single layer or a multilayer including one or more materials selected from indium (In), titanium (Ti), tin (Sn), silicon (Si), germanium (Ge), aluminum (Al), copper (Cu), nickel (Ni), vanadium (V), tungsten (W), tantalum (Ta), molybdenum (Mo), neodymium (Nd), iron (Fe), chromium (Cr), cobalt (Co), gold (Au), and silver (Ag), or an oxide, nitride, or oxynitride thereof. As a specific example, the light absorbing layer includes one or more selected from copper oxide, copper nitride, copper oxynitride, aluminum oxide, aluminum nitride, aluminum oxynitride, and molybdenum titanium oxynitride (molybdenum titanium oxynitrides).

According to one embodiment, the light absorbing layer comprises silicon (Si) or germanium (Ge).

The light absorbing layer formed of silicon (Si) or germanium (Ge) may have a refractive index (n) of 0 to 8 or 0 to 7at 400nm and may have an extinction coefficient (k) greater than 0 and less than or equal to 4, preferably 0.01 to 4, and the extinction coefficient (k) may be 0.01 to 3 or 0.01 to 1.

According to another embodiment, the light absorbing layer includes one or more selected from the group consisting of copper oxide, copper nitride, copper oxynitride, aluminum oxide, aluminum nitride, aluminum oxynitride, and molybdenum titanium oxynitride. In this case, the light absorbing layer may have a refractive index (n) of 1 to 3, for example 2 to 2.5, at 400nm and an extinction coefficient (k) of greater than 0 and less than or equal to 4, preferably 0.01 to 2.5, preferably 0.2 to 2.5, more preferably 0.2 to 0.6.

According to one embodiment, the light absorbing layer is AlOxNy (x >0, y > 0).

According to another embodiment, the light absorbing layer may be AlOxNy (0. ltoreq. x.ltoreq.1.5, 0. ltoreq. y.ltoreq.1).

According to another embodiment, the light absorbing layer is AlOxNy (x >0, y >0) and the number of atoms per atom satisfies the following equation with respect to 100% of the total number of atoms.

According to one embodiment, the light absorbing layer may be formed of a material having an extinction coefficient (k) at 400nm, preferably 380nm to 780 nm.

According to one embodiment, the thickness of the light reflecting layer may be determined according to the target color in the final structure, and for example, the thickness may be 1nm or more, preferably 25nm or more, for example 50nm or more, and preferably 70nm or more.

According to one embodiment, the light absorbing layer may have a thickness of 5nm to 500nm, for example 30nm to 500 nm.

According to one embodiment, the difference in thickness of the regions of the light absorbing layer is 2nm to 200nm, and may be determined according to a target color difference.

According to another embodiment of the present application, the surface resistance of the light absorbing layer is 20 ohm/square or less, preferably less than 20 ohm/square. For example, the light absorbing layer may have a surface resistance of 10 ohm/square or less. For example, the light absorbing layer may have a surface resistance of 1 ohm/square or less. The surface resistance of the light absorbing layer is preferably as low as possible for electromagnetic wave shielding interference. For example, the light absorbing layer may have a surface resistance of 0.1 ohm/square or more.

According to another embodiment of the present application, the entire decoration member including the light reflection layer and the light absorption layer may have a surface resistance of 10 ohm/square or less. For example, the entire trim member may have a surface resistance of 1 ohm/square or less. The surface resistance of the decorative member is preferably as low as possible for electromagnetic wave shielding interference. For example, the decoration member may have a surface resistance of 0.1 ohm/square or more.

According to another embodiment of the present invention, the color film is further provided at: on a surface of the light reflecting layer opposite to a surface facing the light absorbing layer; between the light reflecting layer and the light absorbing layer; or on the surface of the light absorbing layer opposite to the surface facing the light reflecting layer. When the substrate is provided on the light reflection layer side, the color film may be provided between the light reflection layer and the substrate, or on the surface of the substrate opposite to the surface facing the light reflection layer. When the substrate is provided on the light absorbing layer side, the color film may be provided between the light absorbing layer and the substrate, or on the surface of the substrate opposite to the surface facing the light absorbing layer.

When the color film is present, the color film is not particularly limited as long as the color film has a color difference Δ E of more than 1, as compared with when the color film is not provided^*ab, i.e. the distance in space of the color coordinates CIE L a b in the color-rendering layer.

Colors can be represented by CIE L a b, and distances in space (Δ E) can be used^*ab) to define the color difference. Specifically, the color difference is

And is at 0<ΔE^*ab<1, the observer may not be able to recognize the color difference [ reference: machine Graphics and Vision (Machine Graphics)Shape and vision) 20(4) 383-]. Therefore, in the present specification, the color difference obtained by color film addition can be represented by Δ E^*ab>1 is defined as follows.

Fig. 11(a) shows a structure in which the light reflecting layer (201), the light absorbing layer (301), and the color film (401) are continuously laminated, fig. 11(b) shows a structure in which the light reflecting layer (201), the color film (401), and the light absorbing layer (301) are continuously laminated, and fig. 11(c) shows a structure in which the color film (401), the light reflecting layer (201), and the light absorbing layer (301) are continuously laminated.

The colored film can also function as a substrate. For example, a material that can be used as a substrate can be used as a color film by adding a pigment or a dye thereto.

The substrate may be provided at: on a surface of the light reflecting layer opposite to a surface facing the light absorbing layer; or on the surface of the light absorbing layer opposite to the surface facing the light reflecting layer. Fig. 12(a) shows an example in which a substrate is provided on a surface of the light reflecting layer opposite to a surface facing the light absorbing layer, and fig. 12(b) shows an example in which a substrate is provided on a surface of the light absorbing layer opposite to a surface facing the light reflecting layer.

For example, when the substrate is disposed on the surface of the light reflection layer opposite to the surface facing the light absorption layer and the color film is located on the surface of the light reflection layer opposite to the surface facing the light absorption layer, the color film may be disposed at: between the substrate and the light reflecting layer; or on the surface of the substrate opposite to the surface facing the light reflecting layer. As another example, when the substrate is disposed on a surface of the light absorbing layer opposite to a surface facing the light reflecting layer and the color film is located on a surface of the light absorbing layer opposite to a surface facing the light reflecting layer, the color film may be disposed at: between the substrate and the light absorbing layer; or on the surface of the substrate opposite to the surface facing the light absorbing layer.

According to another embodiment of the present application, a substrate is disposed on a surface of the light reflection layer opposite to a surface facing the light absorption layer, and a color film is further disposed. Fig. 13(a) shows a structure in which a color film (401) is provided on a surface of the light absorbing layer (301) opposite to the light reflecting layer (201), fig. 13(b) shows a structure in which the color film (401) is provided between the light absorbing layer (301) and the light reflecting layer (201), fig. 13(c) shows a structure in which the color film (401) is provided between the light reflecting layer (201) and the substrate (101), and fig. 13(d) shows a structure in which the color film (401) is provided on a surface of the substrate (101) opposite to the light reflecting layer (201). Fig. 13(e) shows a structure in which color films (401a, 401b, 401c, 401d) are respectively provided on the surface of the light absorbing layer (301) opposite to the light reflecting layer (201) side, between the light absorbing layer (301) and the light reflecting layer (201), between the light reflecting layer (201) and the substrate (101), and on the surface of the substrate (101) opposite to the light reflecting layer (201) side, however, the structure is not limited thereto, and 1 to 3 of the color films (401a, 401b, 401c, 401d) may not be included.

According to another embodiment of the present application, a substrate is disposed on a surface of the light absorbing layer opposite to a surface facing the light reflecting layer, and a color film is further disposed. Fig. 14(a) shows a structure in which a color film (401) is provided on a surface of a substrate (101) opposite to the light absorption layer (301) side, fig. 14(b) shows a structure in which the color film (401) is provided between the substrate (101) and the light absorption layer (301), fig. 14(c) shows a structure in which the color film (401) is provided between the light absorption layer (301) and the light reflection layer (201), and fig. 14(d) shows a structure in which the color film (401) is provided on a surface of the light reflection layer (201) opposite to the light absorption layer (301) side. Fig. 14(e) shows a structure in which color films (401a, 401b, 401c, 401d) are respectively provided on the surface of the substrate (101) opposite to the light absorbing layer (301) side, between the substrate (101) and the light absorbing layer (301), between the light absorbing layer (301) and the light reflecting layer (201), and on the surface of the light reflecting layer (201) opposite to the light absorbing layer (301) side, however, the structure is not limited thereto, and 1 to 3 of the color films (401a, 401b, 401c, 401d) may not be included.

In the structure such as fig. 13(b) and 14(c), when the color film has a visible light transmittance of more than 0%, the light reflection layer may reflect light entering through the color film, and thus, color may be obtained by laminating the light absorption layer and the light reflection layer.

In the structures such as fig. 13(c), 13(d) and 14(d), the transmittance of the color displayed from the color film of the light reflection layer (201) may be 1% or more, preferably 3% or more, more preferably 5% or more, so that the change in the color difference obtained by the color film addition can be recognized. This is because the light transmitted in such a light transmittance range can be mixed with the color obtained by the color film.

The color film may be provided as one sheet (sheet), or as a laminate of two or more sheets of the same or different types.

A material capable of displaying a target color by combining with a color displayed by the above-described laminated structure of the light reflecting layer and the light absorbing layer may be used as the color film. For example, a color film that expresses color by dispersing one or two or more pigments and dyes into a matrix resin may be used. Such a color film may be formed by directly applying the composition for forming a color film on a position where the color film can be disposed, or a method of preparing a color film by applying the composition for forming a color film on a separate substrate or using a known molding method such as casting or extrusion, and then disposing or attaching the color film on a position where the color film can be disposed may be used.

The pigment and dye that can be contained in the color film may be selected from pigments and dyes that can obtain a target color from a final decorative member, and are known in the art, and one or two or more of pigments and dyes such as a red-based, yellow-based, violet-based, blue-based, or pink-based pigment and dye may be used. Specifically, dyes such as perillyl ketone (perinone) -based red dyes, anthraquinone-based red dyes, methine yellow dyes, anthraquinone-based violet dyes, phthalocyanine-based blue dyes, thioindigo-based pink dyes, or isoindigo (isoxindigo) -based pink dyes may be used alone or as a combination. Pigments such as carbon black, copper phthalocyanine (c.i. pigment blue 15:3), c.i. pigment red 112, pigment blue or isoindoline yellow may be used alone or as a combination. Commercially available pigments and dyes may be used, and for example, materials manufactured by CibaORACET or Achlung Paint company (Chokwang Paint Ltd.) may be used as such dyes or pigments. The type of dye or pigment and its color are for illustrative purposes only, and various known dyes or pigments may be used and more various colors may be obtained therefrom.

As the matrix resin contained in the color film, a material known as a transparent film, a primer layer, an adhesive layer, or a coating material may be used, and the matrix resin is not particularly limited to these materials. For example, various materials such as acrylic-based resins, polyethylene terephthalate-based resins, urethane-based resins, linear olefin-based resins, cyclic olefin-based resins, epoxy-based resins, or triacetylcellulose-based resins may be selected, and copolymers or mixtures of the above materials may also be used.

When the color film is disposed closer to the position where the decorative member is observed than the light-reflecting layer or the light-absorbing layer in the structures of, for example, fig. 13(a) and 13(b) and fig. 14(a), 14(b), and 14(c), the light transmittance of the color displayed by the color film of the light-reflecting layer, the light-absorbing layer, or the laminated structure of the light-reflecting layer and the light-absorbing layer may be 1% or more, preferably 3% or more, more preferably 5% or more. Thus, a target color can be obtained by combining a color displayed from the color film and a color displayed from the light reflection layer, the light absorption layer, or the laminated structure thereof.

The thickness of the color film is not particularly limited, and those skilled in the art can select and set the thickness as long as they can obtain the target color. For example, the color film may have a thickness of 500nm to 1 mm.

According to another embodiment of the present application, when the light absorbing layer includes the pattern, the pattern may have a symmetric structure, an asymmetric structure, or a combination thereof.

According to one embodiment, the light absorbing layer may include a symmetrical structure pattern. As the symmetrical structure, a prism structure, a lenticular lens structure, or the like may be included.

In the present specification, the asymmetric structure pattern means having an asymmetric structure on at least one surface when viewed from an upper surface, a side surface or a cross section. When having such an asymmetric structure, the decoration member may exhibit dichroism. Dichroism means that different colors are observed depending on the viewing angle.

Dichroism may be related to the above-mentioned chromatic aberration

And a color difference Δ E according to the angle of view^*ab>1 may be defined as having dichroism.

According to one embodiment, the light absorbing layer has Δ E^*ab>1, dichroism.

According to one embodiment, the light absorbing layer includes a pattern having tapered protrusions or grooves on an upper surface thereof. The tapered shape includes a conical, elliptical conical, or multi-pyramidal shape. Here, the shape of the bottom surface of the multi-pyramid shape includes a triangle, a square, a star shape having 5 or more protruding points, and the like. The tapered shape may have a shape of a protrusion formed on the upper surface of the light absorbing layer or a shape of a groove formed on the upper surface of the light absorbing layer. The protrusion has a triangular cross-section and the groove has an inverted triangular cross-section. The lower surface of the light absorbing layer may have the same shape as the upper surface of the light absorbing layer.

According to one embodiment, the tapered pattern may have an asymmetric structure. For example, when a cone pattern is rotated 360 degrees based on the apex of the cone and viewed from the upper surface, it is difficult to display dichroism from the pattern when there are three or more identical shapes. However, when the cone pattern is rotated 360 degrees based on the apex of the cone and viewed from the upper surface, dichroism may be exhibited when there are two or less identical shapes. Fig. 7 shows the upper surface of the tapered shape, and (a) both show tapered shapes of symmetrical structures, and (b) show tapered shapes of asymmetrical structures.

The taper shape of the symmetrical structure has a structure in which the bottom surface of the taper shape is a circle or a regular polygon having the same side length, and the apex of the taper exists on a vertical line of the center of gravity of the bottom surface. However, the taper shape of the asymmetric structure has a structure in which the position of the apex of the taper exists on a vertical line at a point other than the center of gravity of the bottom surface when viewed from the upper surface, or a structure in which the bottom surface is a polygon or an ellipse of the asymmetric structure. When the bottom surface is a polygon of an asymmetrical structure, at least one side and corner of the polygon may be designed to be different from the remaining portions.

For example, as shown in FIG. 8, the location of the apex of the cone may be changed. Specifically, as shown in the first drawing in fig. 8, when the apex of the cone is designed to be located on the vertical line of the center of gravity (O1) of the bottom surface when viewed from the upper surface, 4 identical structures (4-fold symmetry) can be obtained when rotated 360 degrees based on the apex of the cone. However, by designing the apex of the cone at a position (O2) other than the center of gravity (O1) of the bottom surface, the symmetrical structure is broken. When the length of one side of the bottom surface is taken as x, the migration distances of the apex of the taper are taken as a and b, the height of the taper (the length of a line perpendicularly connecting from the apex of the taper (O1 or O2) to the bottom surface) is taken as h, and the angle formed by the bottom surface and the side surface of the taper is taken as θ n, the cosine values of the surfaces 1, 2, 3, and 4 of fig. 8 can be obtained as follows.

Here, θ 1 and θ 2 are the same, and thus no dichroism exists. However, θ 3 and θ 4 are different, and θ 3- θ 4 | represent a color difference (E ab) between two colors, and thus dichroism may be obtained. Here, - [ theta ] 3-theta 4 | is > 0. As described above, how much the symmetric structure is broken, i.e., the degree of asymmetry, can be quantitatively expressed using the angle formed by the bottom surface and the side surface of the taper, and a value representing such degree of asymmetry is proportional to the chromatic aberration of dichroism.

According to another embodiment, the light absorbing layer includes a pattern having protrusions in which the highest points have a line shape or grooves in which the lowest points have a line shape. The linear shape may be a linear shape or a curved shape, and may include both a curved line and a straight line. When the pattern of protrusions or grooves having a linear shape is rotated by 360 degrees based on the center of gravity of the upper surface and viewed from the upper surface, it is difficult to exhibit dichroism when two or more identical shapes are present. However, when the pattern of protrusions or grooves having a linear shape is rotated by 360 degrees based on the center of gravity of the upper surface and viewed from the upper surface, dichroism may be exhibited when only one identical shape is present. Fig. 9 shows the upper surface of a pattern having linear-shaped protrusions. Fig. 9(a) shows a pattern having linear-shaped protrusions that do not exhibit dichroism, and fig. 9(b) shows a pattern having linear-shaped protrusions that exhibit dichroism. The X-X 'section of FIG. 9(a) is an isosceles triangle or an equilateral triangle, and the Y-Y' section of FIG. 9(b) is a triangle having different side lengths.

According to another embodiment, the light absorbing layer includes a pattern in which the upper surface has protrusions or grooves having a structure in which the tapered upper surface is cut. Such a cross section of the pattern may have a trapezoidal or inverted trapezoidal shape. In this case, dichroism can also be exhibited by designing the upper surface, side surface, or cross section to have an asymmetric structure.

In addition to the structure shown above, various protrusion or groove patterns as shown in fig. 10 can be obtained.

According to another embodiment of the present application, the light absorbing layer may include two or more regions having different thicknesses.

According to the embodiment, light absorption occurs in an entrance path and a reflection path of light in the light absorbing layer, and by reflecting light on each of the surface of the light absorbing layer and the interface of the light absorbing layer and the light reflecting layer, the two reflected lights undergo constructive interference and destructive interference. In this specification, light reflected on the surface of the light absorbing layer may be expressed as surface reflection light, and light reflected on the interface of the light absorbing layer and the light reflecting layer may be expressed as interface reflection light. Fig. 1 and 3 show simulations of this operating principle. In fig. 3, the substrate is not included, however, the substrate may be disposed at the bottom of the light reflection layer.

By fig. 18, a light absorbing layer and a light reflecting layer are described. In the decoration member of fig. 18, the light enters in the direction L_i-1Layer, L_iLayer and L_i+1Sequence of layers Each layer, interface I_iAt L_i-1Layer and L_iBetween layers, interface I_i+1At L_iLayer and L_i+1Between the layers.

When light having a specific wavelength is irradiated in a direction perpendicular to each layer so that thin film interference does not occur, the interface I_iThe reflectivity can be expressed by the following mathematical equation 1.

[ mathematical equation 1]

In mathematical equation 1, n_i(λ) represents a refractive index according to a wavelength (λ) of the i-th layer, k_i(λ) represents an extinction coefficient according to the wavelength (λ) of the ith layer. The extinction coefficient is a measure that can define the intensity at which a host material absorbs light of a particular wavelength, and this definition is as described above.

Using mathematical equation 1, the interface I as calculated at each wavelength_iThe sum of the reflectivities at each wavelength is R_iWhen R is_iAs shown in mathematical equation 2 below.

[ mathematical equation 2]

An example of the structure according to this embodiment is shown in fig. 3 and 4. In fig. 3 and 4, the light absorbing layer (301) is provided on the light reflecting layer (201), and the light absorbing layer has two or more dots having different thicknesses. According to fig. 3, the thicknesses of the a region and the B region are different in the light absorbing layer (301). According to fig. 4, the thicknesses of the C region and the D region are different in the light absorbing layer (301).

According to another embodiment of the present application, the light absorbing layer includes one or more regions having an inclined surface on an upper surface thereof, the inclined surface having an inclination angle greater than 0 degrees and less than or equal to 90 degrees, and the light absorbing layer includes one or more regions having a thickness different from a thickness in any one of the regions having the inclined surface.

The surface characteristics such as the slope of the upper surface of the light reflecting layer may be the same as the upper surface of the light absorbing layer. For example, by using a deposition method in forming the light absorbing layer, the upper surface of the light absorbing layer may have the same slope as the upper surface of the light reflecting layer.

Fig. 5 shows the structure of the decoration member having the light absorption layer in which the upper surface has the inclined surface. The structure is a structure in which a substrate (101), a light reflecting layer (201), and a light absorbing layer (301) are laminated, and the thickness t1 in the region E and the thickness t2 in the region F are different in the light absorbing layer (301).

Fig. 6 relates to a light absorbing layer having inclined surfaces facing each other, the light absorbing layer having a structure of a triangular cross-section. In the structure having the patterns of the inclined surfaces facing each other as in fig. 6, the thickness of the light absorbing layer may be different in both surfaces of the triangular structure even when deposition is performed under the same conditions. Accordingly, the light absorbing layer having two or more regions having different thicknesses may be formed using only one process. Thereby, the displayed color can be made different according to the thickness of the light absorbing layer. Here, when the thickness of the light reflecting layer is equal to or more than a certain thickness, the color change is not affected.

According to another embodiment of the present application, the light absorbing layer includes one or more regions having a gradually varying thickness. Fig. 3 shows a structure in which the thickness of the light absorbing layer gradually changes.

According to another embodiment of the present application, the light absorbing layer includes one or more regions having an inclined surface on an upper surface thereof, the inclined surface having an inclination angle greater than 0 degree and less than or equal to 90 degrees, and at least one region having the inclined surface has a structure in which a thickness of the light absorbing layer gradually changes. Fig. 6 illustrates a structure of a light absorbing layer including a region having an upper surface with an inclined surface. In fig. 6, both the G region and the H region have a structure in which the upper surface of the light absorbing layer has an inclined surface and the thickness of the light absorbing layer gradually changes.

According to one embodiment, the light absorbing layer includes a first region having a first inclined surface having an inclined angle in a range of 1 to 90 degrees, and the light absorbing layer may further include a second region in which the upper surface has an inclined surface having a different inclined direction or a different inclined angle from the first inclined surface, or the upper surface is horizontal. Here, in the light absorbing layer, the thicknesses of the first region and the second region may be different from each other.

According to another embodiment, the light absorbing layer includes a first region having a first inclined surface having an inclined angle in a range of 1 to 90 degrees, and the light absorbing layer may further include two or more regions in which the upper surface has an inclined surface having a different inclined direction or a different inclined angle from the first inclined surface, or the upper surface is horizontal. Here, in the light absorbing layer, the thicknesses in the first region and the two or more regions may all be different from each other.

According to one embodiment, a substrate disposed on a lower surface of the light reflecting layer or an upper surface of the light absorbing layer may be further included. The surface characteristics of the substrate, such as the slope of the upper surface, may be the same as the upper surfaces of the light reflecting layer and the light absorbing layer. By forming the light reflection layer and the light absorption layer using a deposition method, the substrate, the light reflection layer, and the light absorption layer may have inclined surfaces of the same angle. For example, the above structure may be obtained by forming an inclined surface or a three-dimensional structure on the upper surface of the substrate and sequentially depositing the light reflecting layer and the light absorbing layer thereon, or sequentially depositing the light absorbing layer and the light reflecting layer.

According to one embodiment, a method of forming a pattern on an ultraviolet curable resin and curing the resultant using ultraviolet rays or processing with a laser may be used to form an inclined surface or a three-dimensional structure on a surface of a substrate.

According to one embodiment, the surface resistance of the entire decoration element including the light reflection layer, the light absorption layer, and the substrate (if necessary) is 20 ohm/square or less, for example, less than 20 ohm/square. Therefore, when the decoration member is used for decoration in the electronic device, the function of electromagnetic interference blocking can be also achieved.

According to one embodiment, the decoration element may be a decoration film or a casing of the mobile device. The decoration member may further include a glue layer according to necessity.

The material of the substrate is not particularly limited, and when the inclined surface or the three-dimensional structure is formed using the above-described method, an ultraviolet curable resin known in the art may be used.

On the light absorbing layer, a protective layer may also be provided.

According to one embodiment, an adhesive layer may be further provided on the opposite surface of the substrate provided with the light absorbing layer or the light reflecting layer. The adhesive layer may be an Optically Clear Adhesive (OCA) layer. If necessary, a release liner (release liner) may be further provided on the adhesive layer for protection.

In this specification, deposition such as a sputtering method has been described as an example of forming the light reflecting layer and the light absorbing layer, however, various methods of preparing a thin film may be used as long as the configuration and characteristics according to the embodiments described in this specification can be obtained. For example, a vapor deposition method, a Chemical Vapor Deposition (CVD) method, a wet coating, or the like may be used.

The present disclosure will be described in more detail below with reference to examples. However, the following examples are for illustrative purposes only and do not limit the scope of the present disclosure.

Examples 1 and 2 and comparative examples 1 and 2

On the transparent PET, a light reflective layer formed of aluminum oxynitride was formed using reactive sputtering deposition. The composition of the resulting light reflective layer is shown in table 2. The light reflectance of the light reflecting layer is shown in fig. 15. 2%, 4%, 6% and 8% in fig. 15 represent N under the condition of deposition of the light reflective layer₂Partial pressure.

A light absorbing layer (thickness 40nm) formed of aluminum oxynitride was formed thereon using the conditions of table 3 below. The refractive index (n) and extinction coefficient (k) of the light-absorbing layer are shown in table 4. When preparing the light-absorbing layer, at 3X 10^-6The deposition process was performed under vacuum conditions of a base pressure of Torr and a process pressure of 3 mTorr, Ar gas was adjusted to 100sccm, andreaction gas N₂To prepare a light absorbing layer having the composition shown in table 3 below.

[ TABLE 2]

[ TABLE 3 ]

The element content measurements of tables 2 and 3 were performed by the XPS analysis method under the following specific conditions.

K-alpha, Saimer non-Seal science and technology Inc (Thermo Fisher Scientific Inc)

An X-ray source: monochromatic Al K alpha (1486.6eV),

x-ray spot size: 300 μm

Ar ion etching: monoatomic (1000eV, height, grating width: 1.5mm, sputtering rate: 0.18nm/s)

The operation mode is as follows: CAE (constant Analyzer energy) mode

And (3) charge compensation: default FG03 mode (250 μ A, 1V)

Background of peaks: method of using intelligence

[ TABLE 4 ]

The surface resistance and the electromagnetic wave Shielding Effectiveness (SE) of the light reflection layers prepared in the examples and comparative examples were measured, and the results are shown in table 5 below. It can be confirmed that the electromagnetic wave shielding effectiveness is better in the example than in the comparative example.

The electromagnetic wave Shielding Effectiveness (SE) is a value that exhibits an electric field shielding effect and a magnetic field shielding effect, is calculated by an SE of 10log (P1/P0) of a received power level (P1) of the receiver when the load sample is mounted with respect to a received power level (P0) of the receiver when the reference sample is mounted, and is a sum of a reflection loss (R), an absorption loss (a), and a correction factor (B) of the light reflection layer.

The surface resistances of the light reflection layers of the examples and comparative examples were measured according to the 4-point probe method using a known surface resistor. The surface resistance of the entire stack depends on the resistance of the light reflecting layers having a low surface resistance because these layers are connected in parallel. Specifically, the surface resistance was measured using a measurement device of Hiresta MCP-HT450, ASP Probe (ASP PROBE).

[ TABLE 5 ]

	Surface resistance (ohm/square)	SE[dB]
			Example 1	4.7	32
Example 2	16	23
			Comparative example 1	22	20.3
Comparative example 2	64	0.321

As shown in table 5, it was confirmed that, in the example, the electromagnetic wave shielding effectiveness was excellent.

Example 3

Preparation was performed in the same manner as in example 1, except that a gold primer (blue primer) coating layer and a substrate having an asymmetric prism structure were formed on a transparent PET film, instead of transparent PET.

Example 4

Preparation was performed in the same manner as in example 2, except that a blue primer (blue primer) coating layer and a substrate having an asymmetric prism structure were formed on a transparent PET film, instead of the transparent PET film.

The optical simulation results of example 3 and example 4 are shown in fig. 17. From fig. 17, it can be seen that various colors are obtained with the introduction of the asymmetric prism structure and the color film. As shown by the arrows of fig. 17, the right, lower, left, and upper surfaces of fig. 17 represent colors obtained when the laminated film of fig. 17 is viewed from the right, from below, from the left, and from above, respectively.