Patent Description:
When a light is incident into a film, the light reflected from a surface of the film, and the light reflected from the film after passing through the film, are constructively interfered, and then the color of the light externally displayed is determined. Here, the change or the variation of the color of the light externally displayed according to an incident angle of the light is defined as structural coloration.

The color due to the structural coloration may be changed or varied according to the number of layers stacked on the film, the height of the layers stacked on the film, and so on. Thus, various kinds of products using the above-mentioned properties are manufactured.

Recently, as preference for the product having a relatively high-quality exterior is increases, the structural coloration may be applied to the exterior of a sunglass or an expensive product, or may be applied a display device.

Unlike to the above-mentioned structural coloration in which various kinds of colors are displayed according to viewing angles, an identification film in which specific patterns are formed to have a specific reflective spectrum on a specific wavelength has been developed and applied to an anti-counterfeiting product. For example, in <CIT>, a plurality of reflective spectrums covering various kinds of wavelengths is formed in the identification film, and thus the identification or the security on the identification film may be enhanced.

In addition, in <CIT>, a magneto-variable material displaying colors changed according to the change of the magnetic field, is used to manufacture the anti-counterfeiting product.

Accordingly, the structural coloration or the light conversion structure may be widely used, and thus a structure displaying the reflective light having various colors or patterns more efficiently is more needed.

Related prior art patent publications include <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, and <CIT>.

The present invention is developed to solve the above-mentioned problems of the related arts. The present invention provides a structural coloration substrate having more various and more complex patterns to be encrypted, so that the security may be more increased and the manufacturing may be more simplified.

A method of manufacturing a structural coloration substrate according to the invention is defined in claim <NUM>.

A structural coloration substrate according to the invention is defined in claim <NUM>. Further embodiments of the invention are defined in the dependent claims.

The above mentioned structural coloration substrate exiting various kinds of colors and patterns may be used as the security substrate. Thus, the encrypted security substrate may be manufactured, and the security substrate may be used to an encrypted code for moneys or expensive products for enhancing the security.

One advantage of the present invention is that the forming or the manufacturing the pattern may be performed more easily or more efficiently. The structural coloration layer may be stacked via an atomic layer deposition, and thus the coating may be performed to have a relatively fine thickness in a range about tens of nano meters and the effect of the structural coloration may be maintained. Thus, the structural coloration substrate may be effectively used for the moneys or the barcodes.

Another advantage of the present invention is that the structural coloration substrate having the quantum dot, the structural coloration layer and the light conversion structure may be easily manufactured, and thus various kinds of patterns may be included and the productivity and the manufacturing efficiency may be increased.

In addition, the security substrate manufactured by the method mentioned above, may be effectively used for the security verification system. Here, in the security verification system, the security pattern may be identified by the scanner, and the coincidence between the security pattern and the stored pattern may be decided.

Here, the structural coloration substrate may display various kinds of complex colors and patterns due to the addition of the quantum dot or the light conversion structure. Thus, if the structural coloration substrate is encrypted and used for the security verification system, the structural coloration substrate may be prevented from being imitated, and thus the security may be more increased. Here, the pattern or the color displayed by the structural coloration substrate may be imitated only if the entire processes for manufacturing the structural coloration substrate are substantially same, and it is impossible to find out the entire manufacturing processes from the final product of the structural coloration substrate. Thus, the imitation or the copy of the pattern or the color of the structural coloration substrate may be impossible in principle, and thus the security may be more increased.

However, due to the limitation of the manufacturing processes of the structural coloration substrate, the color or the pattern may be blurred or be hard to be identified in a boundary area between the adjacent patterns. Thus, in scanning the structural coloration substrate, the scanner would better scan the color or the pattern at a central portion of each pattern in the structural coloration substrate.

In addition, the database includes an information displayed by the security pattern according to the angle of the incident light, and the scanner may rotate to change the angle of the incident light incident into the security substrate. Thus, the verification for the single security substrate may be performed with various kinds of processes, and thus the security may be more increased.

The invention is described more fully hereinafter with Reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms as long as they fall within the scope of the claims. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.

It will be understood that, although the terms first, second, third etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.

Thus, the term "below" can encompass both an orientation of above and below.

The invention is described more fully hereinafter with reference to the accompanying drawings.

<FIG> is a flow chart illustrating a method for manufacturing a structural coloration substrate according to an example embodiment of the present invention. <FIG> and <FIG> are process views illustrating the method for manufacturing the structural coloration substrate of <FIG>, and <FIG> and <FIG> are plan views illustrating a pattern and a color displayed externally through the structural coloration substrate of <FIG>.

Referring to <FIG>, in manufacturing the structural coloration substrate <NUM> according to the present example embodiment, a first pattern <NUM> is formed on a base substrate <NUM> using a quantum dot(step S11), and the first pattern <NUM> displays a first color A. The base substrate <NUM> absorbs a light from outside, and here the light from outside means that the light passes through an upper substrate <NUM> and is provided to the base substrate <NUM>. For example, the base substrate <NUM> may include a black or black-based color. When the base substrate <NUM> includes the black or black-based color, a second color B having the black or black-based color may be displayed as viewed in an upper portion of the base substrate <NUM>, as illustrated in <FIG>.

The first pattern <NUM> formed by the quantum dot has a relatively thinner thickness, and thus the first pattern <NUM> is directly formed on the base substrate <NUM>, and a structural coloration layer explained below may also be formed on the first pattern <NUM>.

Alternatively, the first pattern <NUM> formed by the quantum dot may be formed on an upper substrate.

For example, referring to <FIG> and <FIG>, in forming the first pattern <NUM> on the base substrate <NUM>, the upper substrate <NUM> is disposed on the base substrate <NUM> (step S12).

Here, the upper substrate <NUM> is a transparent substrate, and may include a non-metallic material such as a glass, silicon and so on, or a metallic material such as sliver, aluminum and so on. On the upper substrate <NUM>, the subsequent processes like forming the quantum dot or stacking the structural coloration layer are performed, and thus the upper substrate <NUM> may also include the materials or may be surface-treated for performing the subsequent processes more efficiently.

Then, referring to <FIG> and <FIG>, in forming the first pattern <NUM> on the base substrate <NUM>, the first pattern <NUM> displaying the first color A may be formed on the upper substrate <NUM> using the quantum dot (step S13).

Here, the first pattern <NUM>, as explained above, may be directly formed on the base substrate <NUM>, and thus a structure, an arrangement, a material and so on of the first pattern <NUM> are substantially same as the first pattern <NUM> for the process of forming the first pattern <NUM> directly formed on the base substrate <NUM>.

In <FIG>, the first pattern <NUM> is embedded in an inside from an upper surface of the upper substrate <NUM>. To form the embedded first pattern <NUM>, the quantum dot is imprinted into the inside of the upper substrate <NUM> and then a doctoring is performed on the surface of the upper substrate <NUM>, or a groove for the first pattern <NUM> is formed on the upper substrate <NUM> and then the quantum dot is filled with the groove via a capillary phenomenon.

In some non-claimed configurations, the first pattern <NUM> is formed to be protruded from the upper substrate <NUM>. To form the protruded quantum dot pattern, the quantum dot may be printed on the upper substrate <NUM> via a printing process, or the quantum dot may be selectively coated on the upper substrate <NUM> via a mask pattern.

The first pattern <NUM> formed via the above-mentioned process, as illustrated in <FIG>, may be a longitudinal pattern extending along a line on an upper surface of the upper substrate <NUM>. Alternatively, although not shown in the figure, the first pattern <NUM> may be a dot pattern, a checkerboard pattern and so on. In addition, the distance between the patterns may be uniform or different from each other, and in the dot pattern, each dot may have a circular shape or various kinds of shapes.

Accordingly, as the shape or the arrangement of the first pattern <NUM> may be changed variously, and thus a security pattern explained below of the structural coloration substrate may be more complicated, to improve the security.

As illustrated in <FIG>, when the first pattern <NUM> is the longitudinal pattern extending the direction, the first pattern <NUM> may display the first color A externally.

Thus, the base substrate <NUM> on which the first pattern <NUM> is formed, may display the first color A and a second color B different from the first color A alternately.

Although not shown in the figure, the upper substrate <NUM> may be omitted and the first pattern <NUM> may be directly formed on the base substrate <NUM> using the quantum dot, and thus the color displayed externally may be alternately changed by the first color A and the second color B, as illustrated in <FIG>.

Then, referring to <FIG> and <FIG>, at least one structural coloration layer <NUM> is stacked on the upper substrate <NUM> or the base substrate <NUM> (when the upper substrate <NUM> is omitted) on which the first pattern <NUM> is formed (step S14).

The structural coloration layer <NUM> stacked is at least one, and thus as each of the structural coloration layer <NUM> is stacked, the color displayed externally may be changed.

Each of the at least one structural coloration layer <NUM> may include TiO<NUM> or Al<NUM>O<NUM>. For example, a first layer of the stacked structural coloration layers includes TiO<NUM>, a second layer thereof on the first layer includes Al<NUM>O<NUM>, and a third layer thereof on the second layer includes TiO<NUM>. Here, the combination of the materials of the structural coloration layer may be variously changed.

In addition, for example, each of the at least one structural coloration layer may be formed via an atomic layer deposition (ALD), and thus, each of the structural coloration layer may be stacked with a relatively fine thickness in a range of tens of nano meters. Further, regardless of the shape of the first pattern, the thickness of the structural coloration layer may be formed with a relatively fine thickness.

Accordingly, the security substrate manufactured by the method according to the present example embodiment, may have the relatively fine thickness, and thus the security substrate may have more enhanced usability and security.

Alternatively, to increase the productivity and the efficiency of the process, each of the structural coloration layer may be stacked or formed via a thin film coating process such as a chemical vapor deposition (CVD), an evaporation, a coating and so on.

As the at least one structural coloration layer <NUM> is stacked, as illustrated in <FIG>, the color displayed externally due to the structural coloration layer is changed. For example, the second color B displayed by the base substrate <NUM> may be changed to be a fourth color C different from the second color B, as the structural coloration layer <NUM> is stacked. In addition, the first color A displayed by the first pattern <NUM> may be changed to be a third color A' different from the first color A, as the structural coloration layer <NUM> is stacked.

However, since the third color A' is different from the fourth color C, as illustrated in <FIG>, in the pattern displayed externally, the third color A' and the fourth color C are arranged alternately.

Here, the colors exampled as in <FIG> and <FIG>, may be variously changed according to the material of the structural coloration layer, the number of the stacked structural coloration layers, and so on. In addition, the colors may be variously changed according to a direction of an incident light or a viewing angle for the structural coloration layer.

However, since the first pattern <NUM> is included, even though the colors displayed externally are changed, the pattern displayed externally is maintained to include the colors different from each other which are alternately changed. Thus, information on the pattern and the color may be encrypted and the structural coloration layer may be verified based on the encrypted information on the pattern and the color.

Referring to <FIG> and <FIG>, a protective layer <NUM> is coated on an upper surface of the structural coloration layer <NUM> (step S15). Here, the structural coloration layer <NUM> substantially means the at least one structural coloration layer, but for the convenience of the explanation, hereinafter, the structural coloration layer is used to mean the at least one structural coloration layer.

The protective layer <NUM> may be coated on the upper surface of the structural coloration layer <NUM> with a minimized thickness for protecting the damage of the structural coloration layer <NUM>, via the thin film coating process.

The protective layer <NUM> is formed to prevent the structural coloration layer <NUM> from being damaged, and thus may include a transparent material. Thus, the protective layer <NUM> may protect the structural coloration layer <NUM> with the minimized thickness, so that the encrypted information on the color and the pattern may be prevented from being damage and the durability and the security of the structural coloration substrate may be enhanced.

<FIG> is a flow chart illustrating a method for manufacturing a structural coloration substrate <NUM> not part of the present invention. <FIG> and <FIG> are process views illustrating the method for manufacturing the structural coloration substrate of <FIG>, and <FIG> and <FIG> are plan views illustrating a pattern and a color displayed externally through the structural coloration substrate of <FIG>, not belonging to the present invention.

In the method according to such example, the specific method and the specific process are different from the method for manufacturing the structural coloration substrate <NUM> according to the previous example embodiment referring to <FIG>, but the material used for the method, the process of forming the first pattern using the quantum dot or the process of stacking the structural coloration layer are substantially same as the method in <FIG>, and thus any repetitive explanation concerning the same technical features is omitted.

Referring to <FIG> and <FIG>, in the method for manufacturing the structural coloration substrate <NUM>, not part of the invention, at least one structural coloration layer <NUM> is stacked on the base substrate <NUM> (step S21).

The stacked structural coloration layer <NUM> is at least one layer, and the color displayed externally is changed according to the number of the stacked layers. The method for the stacking the layer and the material of the stacked layer are substantially same as in the method explained referring to <FIG>.

Accordingly, as the structural coloration layer <NUM> is directly stacked on the base substrate <NUM>, as illustrated in <FIG>, the second color B originally displayed by the base substrate <NUM> is changed to a fifth color C' by the structural coloration layer <NUM>.

Here, since the structural coloration layer <NUM> is stacked over an entire surface of the base substrate <NUM>, any additional pattern is not displayed externally and the same fifth color C' is displayed externally or outwardly. Here, when the viewing angle of the incident light incident into the base substrate <NUM> is changed, the fifth color C' may be changed and displayed.

Then, referring to <FIG>, a first pattern <NUM> is formed on an upper surface of the structural coloration layer <NUM> using the quantum dot (step S22).

Here, as explained with regard to <FIG>, a thickness of the first pattern <NUM> formed using the quantum dot is relatively thin, and thus any additional upper substrate <NUM> may be omitted and then the first pattern <NUM> may be directly formed on the upper surface of the structural coloration layer <NUM>.

Alternatively, the first pattern <NUM> may be formed on the upper substrate <NUM>.

In addition, in any cases that the first pattern <NUM> is formed directly on the structural coloration layer <NUM> or on the upper substrate <NUM>, the structure, the arrangement, the material and so on of the first pattern <NUM> may be substantially same as those explained in the previous example embodiment.

Referring to <FIG> and <FIG>, illustrating examples not part of the claimed invention, in forming the first pattern <NUM>, the upper substrate <NUM> is formed on the upper surface of the structural coloration layer <NUM> (step S23), and the first pattern <NUM> is formed on the upper substrate <NUM> using the quantum dot (step S24).

Alternatively, the first pattern <NUM> may be formed on the upper substrate <NUM> using the quantum dot, and then the upper substrate <NUM> on which the first pattern <NUM> is formed may be attached or imprinted on the upper surface of the structural coloration layer <NUM>.

The upper substrate <NUM> may be transparent, and the first pattern <NUM> formed using the quantum dot may display the first color A as explained above.

Here, in forming the first pattern <NUM> on the upper substrate <NUM>, the upper substrate <NUM> on which the first pattern <NUM> is formed is disposed on the upper surface of the structural coloration layer <NUM>, and thus, as illustrated in <FIG>, the first color A is displayed outwardly or externally in the position at which the first pattern <NUM> is formed.

Referring to <FIG>, the structural coloration layer <NUM> and the first pattern <NUM> overlap with each other, and thus the longitudinal pattern displaying the first color A and the longitudinal pattern displaying the fifth color C' are alternately arranged. Thus, the patterns having colors different from each other are displayed outwardly or externally.

Here, as the incident angle of the light incident into the structural coloration substrate is changed or as the viewing angle on the structural coloration substrate is changed, the color displayed externally may be changed. However, the alternately changed pattern of the longitudinal patterns respectively having the colors different from each other is uniformly maintained.

Then, referring to <FIG> and <FIG>, illustrating examples not covered by the claims, a protective layer <NUM> is coated on an upper surface of the upper substrate <NUM> on which the first pattern <NUM> is formed (step S25).

The protective layer <NUM> may be coated on the upper surface of the structural coloration layer <NUM> with a minimized thickness for protecting the damage of the structural coloration layer <NUM>, via the thin film coating process. Thus, the protective layer <NUM> may protect the first pattern <NUM>, so that the encrypted information on the colors and the patterns may be prevented from being damage and the durability and the security of the structural coloration substrate may be enhanced.

<FIG> is a flow chart illustrating a method for manufacturing a structural coloration substrate <NUM> not part of the present invention. <FIG> and <FIG> are process views, not belonging to the invention, illustrating the method for manufacturing the structural coloration substrate of <FIG>.

In the method according to the present example, the specific method and the specific process are different from the method for manufacturing the structural coloration substrate <NUM> according to the previous example embodiments referring to <FIG> and <FIG>, but the material used for the method, and the process of stacking the structural coloration layer are substantially same as the method in <FIG> and <FIG>, and thus any repetitive explanation concerning the same technical features is omitted.

Referring to <FIG> and <FIG>, in the method according the present example , not part of the invention, at least one structural coloration layer <NUM> is stacked on the base substrate <NUM> (step S31).

Here, the structural coloration layer <NUM> is stacked over an entire area of the base substrate <NUM>, and thus the color originally displayed by the base substrate <NUM> is changed by the structural coloration layer <NUM> and is displayed externally.

Then, referring to <FIG> and <FIG>, illustrating an example not belonging to the invention, a first pattern <NUM> is formed on an upper surface of the structural coloration layer <NUM> using the quantum dot (step S22).

Here, as explained above, the first pattern <NUM> formed using the quantum dot has a relatively thinner thickness, and thus any additional upper substrate <NUM> may be omitted and the first pattern <NUM> may be directly formed on an upper surface of the structural coloration layer <NUM>.

In addition, in cases that the first pattern <NUM> is directly formed on the structural coloration layer <NUM> or the first pattern <NUM> is formed on the upper substrate <NUM>, the technical features such as the structure, the arrangement, the material and so on of the first pattern <NUM> are substantially same as explained above.

In forming the first pattern <NUM>, the upper substrate <NUM> is disposed on the upper surface of the structural coloration layer <NUM>, and the first pattern <NUM> may be formed on the upper substrate <NUM> using the quantum dot.

As the first pattern <NUM> is formed on the upper surface of the structural coloration layer <NUM>, the color displayed by the first pattern <NUM> is displayed externally at the position in which the first pattern <NUM> is formed.

Referring again to <FIG> and <FIG>, not part of the invention, at least one structural coloration layer <NUM> is additionally stacked on the base substrate <NUM> on which the first pattern <NUM> is formed (step S33).

Here, the additionally stacked structural coloration layer <NUM> is at least one layer, and thus the first pattern <NUM> is interposed between the plurality of the structural coloration layers <NUM> and <NUM>.

In addition, the material of the additionally stacked structural coloration layer <NUM> may be selected considering the material of the previously stacked structural coloration layer <NUM>, and thus various kinds of colors may be displayed externally due to the structural coloration layer.

As the structural coloration layer <NUM> is additionally stacked, the color displayed due to the previously stacked structural coloration layer <NUM> is changed, and the color displayed due to the first pattern <NUM> is also changed. However, the color displayed at the position in which the first pattern <NUM> is formed, is different from the color displayed at the position in which the structural coloration layers <NUM> and <NUM> overlap with each other.

Thus, more various kinds of colors are displayed outwardly.

Then, referring to <FIG> and <FIG>, illustrating another example that does not belong to the invention, a protective layer <NUM> is coated on an upper surface of the structural coloration layer <NUM> (step S34). Here, the coating of the protective layer <NUM> is substantially same as the coating of the protective layer mentioned above, and thus any repetitive explanation is omitted.

<FIG> is a flow chart illustrating a method for manufacturing a structural coloration substrate <NUM> not part of the present invention. <FIG>, <FIG>, <FIG> and <FIG> are process views illustrating the exemplary method for manufacturing the structural coloration substrate of <FIG>.

In such examples, the material used for the method, and the process of stacking the structural coloration layer are substantially same as the method in <FIG>, <FIG> and <FIG>, and thus any repetitive explanation concerning the same technical features is omitted.

Referring to <FIG> and <FIG>, illustrating an example that is not part of the invention, at least one structural coloration layer <NUM> is stacked on the base substrate (step S41).

As the structural coloration layer <NUM> is directly stacked on the base substrate <NUM>, although not shown in the figure, the second color B originally displayed by the base substrate <NUM> is changed due to the structural coloration layer <NUM> and is displayed externally.

Here, the structural coloration layer <NUM> is stacked over an entire area of the base substrate <NUM>, and thus any additional pattern is not displayed externally and same color is displayed externally. As explained above, as the angle of the incident light into the base substrate <NUM> is changed, the color may be changed and displayed.

Then, referring to <FIG>, <FIG> and <FIG>, showing configurations not falling under the claims of the invention, a mask pattern <NUM> is disposed on the structural coloration layer <NUM>, and the structural coloration layer <NUM> is patterned using the mask pattern <NUM> to form a first pattern <NUM> (step S42).

Here, the mask pattern <NUM> may include an opening at which the first pattern <NUM> is formed.

For example, the first pattern <NUM> may be formed via a photolithography or an etching and so on.

The mask pattern <NUM> may be a mask absorbing the light or blocking the light, and thus as the mask pattern <NUM> absorbs or blocks the light, the structural coloration layer <NUM> is patterned to be a structural coloration pattern <NUM> having the first pattern <NUM>. Here, the portions at which the first pattern <NUM> is not formed are not cured and additional removing processes may be performed to remove the portions.

Alternatively, the mask pattern <NUM> may act as an etch stopper, and thus the structural coloration layer <NUM> is selectively etched to be formed as the structural coloration pattern <NUM> having the first pattern <NUM>.

Then, referring to <FIG> and <FIG>, illustrating a step that is not part of the invention, the first pattern <NUM> is extended to form a first extending pattern <NUM> extending from the first pattern <NUM> on the base substrate <NUM> (step S43).

The first extending pattern <NUM> may be formed via the photolithography or the etching and so on.

The mask pattern <NUM> absorbs the light or blocks the light with the structural coloration pattern <NUM>, and thus as the absorption or the blocking of the light, the base substrate <NUM> is patterned and then the first extending pattern <NUM> extending from the first pattern <NUM> with the same pattern is formed. Here, the portions at which the first extending pattern <NUM> is formed are not cured, and additional removing processes may be performed to remove the portions.

The first extending pattern <NUM> is formed inside of the base substrate <NUM>, and the depth of the first extending pattern <NUM> inside of the base substrate <NUM> may be variously selected or controlled.

Alternatively, the mask pattern <NUM> may be the etch stopper with the structural coloration pattern <NUM>, and thus the base substrate <NUM> is selectively etched and then the first extending pattern <NUM> extending from the first pattern <NUM> is formed inside of the base substrate <NUM>.

Then, referring to <FIG> and <FIG>, illustrating another configuration that is not part of the invention, the mask pattern <NUM> is removed from the structural coloration pattern <NUM>.

Then, referring to <FIG> and <FIG>, illustrating another configuration not belonging to the claimed invention, a quantum dot <NUM> is filled into the first pattern <NUM> and the first extending pattern <NUM> (step S44).

In filling the quantum dot <NUM> inside of the first pattern <NUM> and the first extending pattern <NUM>, as explained above, the quantum dot may be filled via the capillary phenomenon, or the quantum dot may be imprinted into the first pattern <NUM> and the first extending pattern <NUM> and then the doctoring may be performed on the surface.

Accordingly, as the quantum dot <NUM> is filled into the first pattern <NUM> and the first extending pattern <NUM>, the first pattern <NUM> having the quantum dot displays the first color A of the quantum dot <NUM> externally.

Thus, in the structural coloration substrate according to the present non-claimed example, the first color A is displayed in the area where the first pattern <NUM> is formed, and the color of the structural coloration layer <NUM> is displayed in the area where the first pattern <NUM> is not formed.

Here, as explained above, the color displayed externally may be changed according to the angle of the incident light or the viewing angle. However, the color displayed in the area where the first pattern <NUM> is formed is different from the color displayed in the area where the first pattern <NUM> is not formed.

Accordingly, the structural coloration substrate having the complex patterns and colors may be manufactured. The information on the patterns and the colors may be encrypted, and the structural coloration substrate may be verified based on the encrypted information on the patterns and the colors.

<FIG> is a perspective view illustrating a structural coloration substrate according to still another example embodiment of the present invention. <FIG> is a schematic view illustrating a color displayed externally through a light conversion structure included by the structural coloration substrate of <FIG>. Here, in <FIG>, a cross-section view of the light conversion structure <NUM> is additionally illustrated for the convenience of the explanation.

Referring to <FIG> and <FIG>, the structural coloration substrate <NUM> according to the present example embodiment includes a base substrate <NUM>, a first pattern <NUM> (or an upper substrate <NUM> at which the first pattern <NUM> is formed), at least one structural coloration layer <NUM> and a light conversion structure <NUM>.

The base substrate <NUM> may include a black color or a black-based color. Thus, when no layer is formed on the base substrate <NUM>, the black color may be displayed externally due to the base substrate <NUM>. However, in the present example embodiment, additional layers are formed or stacked on the base substrate <NUM> and thus the color displayed externally may be changed.

In <FIG>, the upper substrate <NUM> is disposed on the base substrate <NUM>, and the first pattern <NUM> is formed on the upper substrate <NUM>. Alternatively, the upper substrate <NUM> may be omitted and the first pattern <NUM> is formed on the base substrate <NUM>. Here, the thickness of the first pattern is relatively thin, and thus even though the upper substrate <NUM> is omitted, the processes or the alignment for forming the structural coloration layer <NUM> may be performed without any problem.

Thus, in the present example embodiment, the case that the first pattern <NUM> is formed on the upper substrate <NUM> and the case that the first pattern <NUM> is formed on the base substrate <NUM> without the upper substrate <NUM> are explained.

Further, in following example embodiments, the above two cases may be applied or may be included, even though the drawings are omitted for one of the two cases.

Thus, in the present example embodiment and in the following example embodiments, the first pattern <NUM> may be formed on the base substrate <NUM> alone without the upper substrate <NUM> and may be also formed on the upper substrate <NUM> disposed on the base substrate <NUM>, and "the upper substrate <NUM> on which the first pattern <NUM> is formed" means that the first pattern <NUM> is formed on the upper substrate <NUM> disposed on the base substrate <NUM>.

The upper substrate <NUM> may be transparent, and the structure or the material thereof is substantially same as mentioned above.

The quantum dot is formed as the first pattern <NUM> on the upper substrate <NUM>.

Here, the first pattern <NUM>, as illustrated in <FIG>, is the embedded pattern formed inside of the upper surface of the upper substrate <NUM>, and the method forming the embedded pattern is substantially same as mentioned above.

Further, the upper substrate <NUM> may be omitted, and then the first pattern <NUM> is directly formed on the base substrate <NUM> using the quantum dot.

As illustrated in <FIG>, the first pattern <NUM> may be formed on the upper substrate <NUM> or may be formed on the base substrate <NUM> without the upper substrate <NUM>. The first pattern <NUM> may be one of a longitudinal pattern, a dot pattern, a checkerboard pattern and so on. In addition, the distance between the first patterns adjacent to each other may be uniform or different from each other, and the dot in the dot pattern may include a circular shape but not limited thereto.

The first pattern <NUM> includes the quantum dot, and the first pattern <NUM> displays the first color A outwardly or externally.

At least one structural coloration layer <NUM> is stacked on the upper surface of the upper substrate <NUM>. Here, according to the number of the stacked structural coloration layers <NUM>, the color displayed externally may be changed, and thus the number of the stacked layers may be changed considering the color displayed.

When the upper substrate <NUM> is omitted, the structural coloration layer <NUM> may be directly formed on the first pattern <NUM>, and the numbers of the stacked layers or the processes forming the stacked layers are substantially same as the case that the upper substrate <NUM> exits.

The number of the stacked structural coloration layers <NUM> is same all over the entire surface of the upper substrate <NUM>.

Here, the material and the method for forming the structural coloration layer <NUM> are substantially same as explained above.

As illustrated in <FIG>, when the second color B is displayed externally due to the at least one structural coloration layer <NUM> is stacked, the first pattern <NUM> displaying the first color A is changed into a first' color A' due to the structural coloration layer <NUM>.

The light conversion structure <NUM> is formed on the structural coloration layer <NUM>, and includes a base frame <NUM> and at least one structure <NUM>, <NUM> and <NUM> disposed on the base frame <NUM>.

The base frame <NUM> has the height substantially same all over the structural coloration layer <NUM>, and the at least one structure <NUM>, <NUM> and <NUM> is formed on the base frame <NUM> with a predetermined pattern.

Here, the base frame <NUM> and the structure <NUM>, <NUM> and <NUM> are integrally formed with each other, and then are disposed or formed on the structural coloration layer <NUM>. Here, the structure <NUM>, <NUM> and <NUM> may be formed to be protruded from the upper surface of the base frame <NUM>.

For example, the light conversion structure <NUM> may be manufactured via a fine pattern manufacturing process such as the imprinting, and then the light conversion structure <NUM> may be formed on the structural coloration layer <NUM> via an attaching process.

In <FIG>, three structures <NUM>, <NUM> and <NUM> different from each other are illustrated as an example, but the number, the alignment and the shape of the structures <NUM>, <NUM> and <NUM> may be variously changed or selected.

For example, as illustrated in <FIG>, the structure includes a first structure <NUM> extending along a first direction X, a second structure <NUM> extending along the first direction X and being spaced apart from and parallel with the first structure <NUM> along a second direction Y perpendicular to the first direction X, and a third structure <NUM> extending along the first direction X and being spaced apart from and parallel with the second structure <NUM> along the second direction Y.

In addition, each of the first to third structures <NUM>, <NUM> and <NUM> has a cross-sectional shape of a triangle along a YZ plane which is formed along a third direction Z perpendicular to the first and second directions X and Y, and triangular shapes of the first to third structures <NUM>, <NUM> and <NUM> may be different from each other as illustrated in <FIG>.

For example, as illustrated in <FIG> and <FIG>, each of the first to third structures <NUM>, <NUM> and <NUM> has the cross-sectional shape of a right-angled triangle, but a base and a height of each of the first to third structures <NUM>, <NUM> and <NUM> may be different from each other.

Accordingly, all of the first to third structures <NUM>, <NUM> and <NUM> have the cross-sectional shape of the triangle, and each of the first to third structures <NUM>, <NUM> and <NUM> has a sub-triangular shape <NUM> as illustrated in <FIG>.

Here, a plurality of the sub-triangular shapes <NUM> is tightly attached with each other, to form the cross-section shape of the first structure <NUM> as the right-angled triangular shape in a whole, and likewise, each of the second and third structures <NUM> and <NUM> has a plurality of sub-triangular shapes tightly attached with each other.

Further, in the following example embodiments, each structure included in the light conversion structure mentioned below includes a plurality of sub-triangular shapes tightly attached with each other to form a triangular shape or a predetermined shape in a whole, regardless of the structure being protruded or being concaved. That is, the plurality of sub-triangular shapes tightly attached with each other forms an entire shape of the structure.

The light conversion structure <NUM> may include a transparent material.

Thus, the light passing through the base frame <NUM> in the light conversion structure <NUM> merely transmits without refraction, and thus the color displayed under the base frame <NUM> is maintained outwardly.

However, the light passing through the structures <NUM>, <NUM> and <NUM> of the light conversion structure <NUM> is refracted differently according to the shape of each of the structures <NUM>, <NUM> and <NUM>. Thus, the color displayed by the structures <NUM>, <NUM> and <NUM> may be changed due to the structures <NUM>, <NUM> and <NUM>. Here, the displayed color may be different from each other, according to each of the structures <NUM>, <NUM> and <NUM>, since the refraction is changed according to the shape of each of the structures <NUM>, <NUM> and <NUM>.

As illustrated in <FIG>, in the area in which the base frame <NUM> is merely disposed or positioned, the second color B representing the color of the structural coloration layer <NUM> is merely displayed.

However, in the area in which the structures <NUM>, <NUM> and <NUM> are positioned or disposed, the colors displayed outwardly are changed according to the position of each of the structures <NUM>, <NUM> and <NUM>. For example, in the area in which the first structure <NUM> is positioned, the second color B may be changed into and displayed as a third color C. In the area in which the second structure <NUM> is positioned, the second color B may be changed into and displayed as a fourth color D. In the area in which the third structure <NUM> is positioned, the second color B may be changed into and displayed as a fifth color E.

In addition, when the first pattern <NUM> is formed under the light conversion structure <NUM> by the quantum dot, the first pattern <NUM> due to the quantum dot is changed into and displayed as a first' color A' by the structural coloration layer <NUM>, and the refractive index is not changed due to the shape of each of the first to third structures <NUM>, <NUM> and <NUM> so that the color is not changed and displayed as the first' color A'.

Thus, as illustrated in <FIG>, the structural coloration substrate according to the present example embodiment has the complex patterns and colors displayed externally, and thus the imitation for the patterns and the colors may be impossible and the security may be enhanced. Thus, the information on the patterns and the colors may be encrypted, and the structural coloration substrate may be verified based on the encrypted information on the patterns and the colors.

Here, the example colors illustrated in <FIG> may be variously changed according to the number of the stacked structural coloration layers, the kinds of the patterns of the light conversion structures and so on. In addition, the example colors may also be changed according to the direction of the incident light and the viewing angle, as explained above.

<FIG> is a perspective view illustrating a structural coloration substrate according to still another example embodiment of the present invention. <FIG> is a schematic view illustrating a color displayed externally through a light conversion structure included by the structural coloration substrate of <FIG>. Here, the cross-sectional shape of the light conversion structure <NUM> is additionally illustrated in <FIG> for the convenience of the explanation.

The structural coloration substrate <NUM> according to the present example embodiment is substantially same as the structural coloration substrate <NUM> according to the previous example embodiment of <FIG> and <FIG>, except for a shape of the light conversion structure <NUM>, and thus any repetitive explanation concerning the same technical features is omitted.

Referring to <FIG> and <FIG>, the structural coloration substrate <NUM> according to the present example embodiment includes a base substrate <NUM>, a first pattern <NUM> (or an upper substrate <NUM> in which the first pattern <NUM> is formed), at least one structural coloration layer <NUM> and a light conversion structure <NUM>, and the arrangement, the shape, the manufacturing process of each of the base substrate <NUM>, the first pattern <NUM> or the upper substrate <NUM>, and the structural coloration layer <NUM> are substantially same as mentioned above.

However, in the present example embodiment, the light conversion structure <NUM> includes a base frame <NUM>, and at least one structure <NUM>, <NUM> and <NUM> formed on the base frame <NUM>, and at least one structure <NUM>, <NUM> and <NUM> is formed concaved inside of the base frame <NUM>.

For example, as illustrated in <FIG>, the structure includes a first structure <NUM> extending along the first direction X and intruded or concaved into the base frame <NUM>, a second structure <NUM> extending along the first direction X, spaced apart from the first structure <NUM> along the second direction Y and intruded or concaved into the base frame <NUM>, and a third structure <NUM> extending along the first direction X, spaced apart from the second structure <NUM> along the second direction Y and intruded or concaved into the base frame <NUM>.

In addition, each of the first to third structures <NUM>, <NUM> and <NUM> has a cross-sectional shape of an intruded triangle along the YZ plane which is formed along the third direction Z, and the intruded triangular shapes of the first to third structures <NUM>, <NUM> and <NUM> may be different from each other as illustrated in <FIG>.

As illustrated in <FIG> and <FIG>, each cross-sectional shape of the first to third structures <NUM>, <NUM> and <NUM> is the triangle, and the intruded internal angles of the triangles of the first to third structures <NUM>, <NUM> and <NUM> are different from each other.

Here, the light conversion structure <NUM> may be manufactured via a fine pattern manufacturing process such as the imprinting and so on, and then may be attached on the structural coloration layer <NUM> via an additional attaching process.

Thus, as explained above, the light passing through the base frame <NUM> merely transmits without the refraction, and the color displayed under the base frame <NUM> is maintained outwardly.

However, the light passing through the structures <NUM>, <NUM> and <NUM> of the light conversion structure <NUM> is refracted differently according to the shape of each of the structures <NUM>, <NUM> and <NUM>. Thus, the color displayed by the structures <NUM>, <NUM> and <NUM> may be changed due to the structures <NUM>, <NUM> and <NUM>. Here, the displayed color may be different from each other, according to each of the structures <NUM>, <NUM> and <NUM>, since the refraction is changed according to the intruded or concaved shape of each of the structures <NUM>, <NUM> and <NUM>.

However, in the area in which the structures <NUM>, <NUM> and <NUM> are positioned or disposed, the colors displayed outwardly are changed according to the position of each of the structures <NUM>, <NUM> and <NUM>. For example, in the area in which the first structure <NUM> is positioned, the second color B may be changed into and displayed as the third color C. In the area in which the second structure <NUM> is positioned, the second color B may be changed into and displayed as the fourth color D. In the area in which the third structure <NUM> is positioned, the second color B may be changed into and displayed as the fifth color E.

<FIG> is a perspective view illustrating a structural coloration substrate according to an example that is not part of the present invention. <FIG> is a schematic view illustrating a color displayed externally through a light conversion structure included by the not claimed structural coloration substrate of <FIG>. Here, the cross-sectional shape of the light conversion structure <NUM> is additionally illustrated in <FIG> for the convenience of the explanation.

The structural coloration substrate <NUM> according to this non-claimed example is substantially same as the structural coloration substrate <NUM> according to the previous example embodiment of <FIG> and <FIG>, except for the disposition of the first pattern <NUM> (or the upper substrate <NUM> in which the first pattern <NUM> is formed) and the structural coloration layer <NUM>, and thus any repetitive explanation concerning the same technical features is omitted.

Referring to <FIG> and <FIG>, illustrating a configuration that does not belong to the claimed invention, the structural coloration substrate <NUM> according to the present example includes a base substrate <NUM>, a first pattern <NUM> (or an upper substrate <NUM> in which the first pattern <NUM> is formed), at least one structural coloration layer <NUM> and a light conversion structure <NUM>, and the arrangement, the shape, the manufacturing process of the base substrate <NUM>, the first pattern <NUM> or the upper substrate <NUM>, the structural coloration layer <NUM> and the light conversion structure <NUM> are substantially same as mentioned above except for the first pattern <NUM> or the upper substrate <NUM> formed on the structural coloration layer <NUM>.

Thus, at least on structural coloration layer <NUM> is stacked on the base substrate <NUM> and the second color B is displayer outwardly or externally.

The first pattern <NUM> displays the first color A, and is formed on the upper surface of the structural coloration layer <NUM>. Alternatively, the upper substrate <NUM> having the first pattern <NUM> displaying the first color A may be formed on the upper surface of the structural coloration layer <NUM>.

Thus, as illustrated in the example, not part of the invention, of <FIG>, the first color A is displayed externally in the area in which the first pattern <NUM> is formed, and the second color B is displayed externally in the area in which the first pattern <NUM> is not formed.

Here, as the light conversion structure <NUM> is additionally formed on the first pattern <NUM> or on the upper substrate <NUM>, the color displayed externally is changed in the area in which the structures <NUM>, <NUM> and <NUM> of the light conversion structure <NUM> are additionally formed.

For example, as illustrated in the example of <FIG>, in the area in which the base frame <NUM> is merely disposed or positioned, the second color B representing the color of the structural coloration layer <NUM> is merely displayed.

In addition, when the first pattern <NUM> is formed under the light conversion structure <NUM> by the quantum dot, the refractive index of the first pattern <NUM> due to the quantum dot is not changed due to the shape of each of the first to third structures <NUM>, <NUM> and <NUM> so that the color is not changed and displayed as the first color A.

Referring to the non-claimed example of <FIG>, the structures of the light conversion structure <NUM> are protruded over the base frame, but alternatively, as explained referring to <FIG> and <FIG>, the structures thereof may be intruded or concaved in the base frame.

<FIG> is a perspective view illustrating a structural coloration substrate according to still another example embodiment not part of the present invention.

The structural coloration substrate <NUM> according to the present example is substantially same as the structural coloration substrate <NUM> according to the previous example embodiment of <FIG>, except for a structural coloration layer 40_2 additionally formed on the first pattern <NUM> (or the upper substrate <NUM> in which the first pattern <NUM> is formed), and thus any repetitive explanation concerning the same technical features is omitted.

Referring to <FIG>, the structural coloration substrate <NUM> includes a base substrate <NUM>, at least one structural coloration layer 40_1, a first pattern <NUM> (or an upper substrate <NUM> in which the first pattern <NUM> is formed), at least one additional structural coloration layer 40_2, and a light conversion structure <NUM>, and the arrangement, the shape, the manufacturing process of each of the base substrate <NUM>, the first pattern <NUM> or the upper substrate <NUM>, and the structural coloration layers 40_1 and 40_2 are substantially same as mentioned above except for the additional structural coloration layer 40_2 additionally formed on the first pattern <NUM> or the upper substrate <NUM>.

Here the first pattern <NUM> or the upper substrate <NUM> on which the first pattern <NUM> is formed, is disposed between the at least one structural coloration layer 40_1 and the at least one additional structural coloration layer 40_2.

Here, the structural coloration layer 40_1 may be formed as a plurality of layers, and the additional structural coloration layer 40_2 may also be formed as a plurality of layers. However, the number of the stacked layers 40_1 may be same as or different from the number of the stacked layers 40_2.

<FIG> is a cross-sectional view illustrating a structural coloration substrate according to still another example embodiment of the present invention.

The structural coloration substrate <NUM> according to the present example embodiment is substantially same as the structural coloration substrate <NUM> according to the previous example embodiment of <FIG> and <FIG>, except for at least on structural coloration layer <NUM> being stacked on an upper surface of a light conversion structure <NUM>, and thus any repetitive explanation concerning the same technical features is omitted.

Referring to <FIG>, the structural coloration substrate <NUM> according to the present example embodiment includes a base substrate <NUM>, a first pattern <NUM> (or an upper substrate <NUM> in which the first pattern <NUM> is formed), a light conversion structure <NUM> and at least one structural coloration layer <NUM>.

The base substrate <NUM> and the first pattern <NUM> or the upper substrate <NUM> formed on the base substrate <NUM> are substantially same as those in the structural coloration substrate <NUM> in <FIG> and <FIG>.

However, in the present example embodiment, the light conversion structure <NUM> is formed on the first pattern <NUM> or the upper substrate <NUM> on which the first pattern <NUM> is formed.

The light conversion structure <NUM> includes a base frame <NUM> and at least one structure <NUM>, <NUM>, <NUM> and <NUM> formed on the base frame <NUM>.

Here, the light conversion structure <NUM> is formed on the first pattern <NUM> or the upper substrate <NUM> on which the first pattern <NUM> is formed. The light conversion structure <NUM> is substantially same as the light conversion structure <NUM> in <FIG>, except for each of the structures <NUM>, <NUM>, <NUM> and <NUM> extending perpendicular to the drawing of <FIG>.

Cross-sectional shapes of first to fourth structures <NUM>, <NUM>, <NUM> and <NUM> of the light conversion structure <NUM> are different from each other. For example, all of the first to fourth structures <NUM>, <NUM>, <NUM> and <NUM> may have the cross-sectional shape of the right triangle, but a base and a height of each of the first to fourth structures <NUM>, <NUM>, <NUM> and <NUM> may be different from each other. Thus, the refractive index is different from each other in the first to fourth structures <NUM>, <NUM>, <NUM> and <NUM>.

In the present example embodiment, the structural coloration layer <NUM> having at least one layer is stacked on the upper surface of the light conversion structure <NUM>. Here, the number of the stacked layers and the thickness of the stacked layers are same all over the light conversion structure <NUM>, which means that the structural coloration layer <NUM> is uniformly formed on the upper surface of the base frame <NUM> and the structures <NUM>, <NUM>, <NUM> and <NUM> regardless of the shapes of the base frame <NUM> and the structures <NUM>, <NUM>, <NUM> and <NUM>.

Thus, the light merely passing through the base frame <NUM> in the light conversion structure <NUM> is not refracted and merely transmits, and thus the color displayed under the base frame <NUM> is maintained and displayed externally.

In the present example embodiment, since the structural coloration layer <NUM> is also formed on the upper surface of the base frame <NUM>, the first color A displayed by the first pattern <NUM> under the base frame <NUM> is changed by the structural coloration layer <NUM> to be displayed as the first' color A' externally.

Although not shown in the figure, the light passing through the structures <NUM>, <NUM>, <NUM> and <NUM> of the light conversion structure <NUM> is refracted differently according to the shapes of the structures <NUM>, <NUM>, <NUM> and <NUM>, and thus the color, for example the second color B, of the structural coloration layer <NUM> may be changed and displayed externally according to the patterns or shapes of the structures <NUM>, <NUM>, <NUM> and <NUM> even though the structural coloration layer <NUM> is formed on the upper surface of the structures <NUM>, <NUM>, <NUM> and <NUM>.

Accordingly, the structural coloration substrate <NUM> according to the present example embodiment has the complex patterns and colors displayed externally and thus the imitation for the patterns and the colors may be impossible and the security may be enhanced. Thus, the information on the patterns and the colors may be encrypted, and the structural coloration substrate may be verified based on the encrypted information on the patterns and the colors.

The structural coloration substrate <NUM> according to the present example embodiment is substantially same as the structural coloration substrate <NUM> according to the previous example embodiment of <FIG>, except for at least one structure of a light conversion structure <NUM> being concaved or intruded into the base frame <NUM> and thus any repetitive explanation concerning the same technical features is omitted.

The first pattern <NUM> may be formed on the base substrate <NUM> using the quantum dot, and alternatively, the upper substrate <NUM> including the first pattern <NUM> may be formed on the base substrate <NUM>.

The light conversion structure <NUM> is formed on the first pattern <NUM> or the upper substrate <NUM> on which the first pattern <NUM> is formed, and the structural coloration layer <NUM> having at least one layer is stacked uniformly on all over the light conversion structure <NUM>.

Here, the light conversion structure <NUM> includes a base frame <NUM>, and at least one structure <NUM>, <NUM>, <NUM> and <NUM> formed on the base frame <NUM>. Here, at least one structure <NUM>, <NUM>, <NUM> and <NUM> is concaved or intruded into the base frame <NUM>.

For example, each of first to fourth structures <NUM>, <NUM>, <NUM> and <NUM> may extend perpendicular to the drawing of <FIG>, and cross-sectional shapes of the first to fourth structures <NUM>, <NUM>, <NUM> and <NUM> may be different from each other. As illustrated in <FIG>, each of the first to fourth structures <NUM>, <NUM>, <NUM> and <NUM> has the cross-sectional shape of a right triangle, but a base and a height of each of the first to fourth structures <NUM>, <NUM>, <NUM> and <NUM> may be different from each other. Thus, the first to fourth structures <NUM>, <NUM>, <NUM> and <NUM> may have the refractive index different from each other.

As explained above, in the light conversion structure <NUM>, the light merely passing through the base frame <NUM> is not refracted and merely transmits, and thus the color displayed under the base frame <NUM> is not changed and displayed externally.

However, in the present example embodiment, since the structural coloration layer <NUM> is also formed on the upper surface of the base frame <NUM>, and thus the first color A displayed by the first pattern <NUM> under the base frame <NUM> is changed by the structural coloration layer <NUM>. Then, the first' color A' is displayed outwardly or externally.

Although not shown in the figure, the light passing through the structures <NUM>, <NUM>, <NUM> and <NUM> of the light conversion structure <NUM> is refracted differently according to the concaved or intruded shapes of the structures <NUM>, <NUM>, <NUM> and <NUM>, and thus the color, for example the second color B, of the structural coloration layer <NUM> may be changed and displayed externally according to the patterns or shapes of the structures <NUM>, <NUM>, <NUM> and <NUM> even though the structural coloration layer <NUM> is formed on the upper surface of the structures <NUM>, <NUM>, <NUM> and <NUM>.

Hereinafter, the method for manufacturing each of the structural coloration substrates <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> explained above, is explained.

<FIG> is a flow chart illustrating a method for manufacturing the structural coloration substrates of <FIG> and <FIG>.

Referring to <FIG>, in the method for manufacturing the structural coloration substrates <NUM> and <NUM> of <FIG> and <FIG>, the first pattern <NUM> is formed on the upper surface of the base substrate <NUM> using the quantum dot (step S51).

Here, when the first pattern <NUM> is formed with the upper substrate <NUM>, in forming the first pattern <NUM> (step S51) may include disposing the upper substrate <NUM> on the upper surface of the base substrate <NUM> (step S52) and forming the first pattern <NUM> on the upper substrate <NUM> using the quantum dot (step S53).

Alternatively, the first pattern <NUM> may be formed on the upper substrate <NUM> using the quantum dot, and then the upper substrate <NUM> having the first pattern <NUM> may be formed or disposed on the upper surface of the base substrate <NUM>.

The step of forming the first pattern <NUM> on the upper substrate <NUM> may be the same as mentioned above, and the upper substrate <NUM> having the first pattern <NUM> may be disposed or formed on the upper surface of the base substrate <NUM> via the imprinting, the attaching and so on.

Then, at least one structural coloration layer <NUM> is stacked on the base substrate <NUM> on which the first pattern <NUM> is formed (step S54). Here, the method for stacking the structural coloration layer <NUM> and the material of the structural coloration layer <NUM> are substantially same as mentioned above.

Then, the light conversion structure <NUM> is formed on the structural coloration layer <NUM> (step S55). In forming the light conversion structure <NUM>, as explained referring to <FIG>, the structures <NUM>, <NUM> and <NUM> may be formed to be protruded from the base frame <NUM> and then the light conversion structure <NUM> may be disposed or formed on the structural coloration layer <NUM>. Here, the structures <NUM>, <NUM> and <NUM> may be intruded or concaved into the base frame, as explained referring to <FIG>.

Then, the structural coloration substrate <NUM> and <NUM> of <FIG> and <FIG> may be manufactured.

<FIG> is a flow chart illustrating a non-claimed exemplary method for manufacturing the structural coloration substrate of <FIG>, wherein at least one structural coloration layer <NUM> is stacked on the upper surface of the base substrate <NUM> (step S61). Here, the method for stacking the structural coloration layer <NUM> and the material of the structural coloration layer <NUM> are same as explained above.

Then, the first pattern <NUM> is formed on the upper surface of the structural coloration layer <NUM> using the quantum dot (step S62).

Likewise, when the upper substrate <NUM> is used for forming the first pattern <NUM>, in forming the first pattern (step S62) includes disposing the upper substrate <NUM> on the upper surface of the structural coloration layer <NUM> (step S63) and forming the first pattern <NUM> on the upper substrate <NUM> using the quantum dot (step S64).

Alternatively, after forming the first pattern <NUM> on the upper substrate <NUM> using the quantum dot, the upper substrate <NUM> having the first pattern <NUM> may be formed or disposed on the upper surface of the base substrate <NUM>.

The method for forming the first pattern <NUM> on the upper substrate <NUM> is same as explained above, and for example, the upper substrate <NUM> may be disposed or formed on the upper surface of the structural coloration layer <NUM> via the imprinting, the attaching and so on.

Then, the light conversion structure <NUM> is formed on the base substrate <NUM> on which the first pattern <NUM> is formed (step S65). In forming the light conversion structure <NUM>, not part of the present invention, as explained referring to <FIG>, the structures <NUM>, <NUM> and <NUM> may be formed to be protruded from the base frame <NUM> and then the light conversion structure <NUM> may be disposed or formed on the structural coloration layer <NUM>. Here, the structures <NUM>, <NUM> and <NUM> may be intruded or concaved into the base frame, although not shown in the figure.

Then, the structural coloration substrate <NUM> of <FIG> may be manufactured.

<FIG> is a flow chart illustrating a non-claimed method for manufacturing the structural coloration substrate of <FIG>, wherein at least on structural coloration layer 40_1 is stacked on the upper surface of the base substrate <NUM> (step S71). Here, the method for stacking the structural coloration layer 40_1 and the material of the structural coloration layer 40_1 are same as explained above.

Then, the first pattern <NUM> is formed on the upper surface of the structural coloration layer 40_1 using the quantum dot (step S72).

Likewise, in using the upper substrate <NUM> in forming the first pattern <NUM>, forming the first pattern <NUM> includes disposing the upper substrate <NUM> on the upper surface of the structural coloration layer 40_1 and forming the first pattern <NUM> on the upper substrate <NUM> using the quantum dot.

Then, at least one additional structural coloration layer 40_2 is additionally stacked on the base substrate <NUM> on which the first pattern <NUM> is formed (step S73). Here, when the first pattern <NUM> is formed on the upper substrate <NUM>, the additional structural coloration layer 40_2 may be additionally stacked on the upper substrate <NUM>.

Here, the additionally stacked structural coloration layer 40_2 may be stacked with the same method of stacking the structural coloration layer 40_1, but the material or the number of the additionally stacked structural coloration layer 40_2 may be different from that of the stacked structural coloration layer 40_1.

Then, the light conversion structure is formed on the upper surface of the additional structural coloration layer 40_2 (step S74), and the structure of the light conversion structure may be same as explained referring to <FIG>.

Then, the structural coloration substrate <NUM> of <FIG>, illustrating a configuration that does not belong to the claimed invention, may be manufactured.

<FIG> is a flow chart illustrating a method for manufacturing the structural coloration substrates of <FIG>.

Referring to <FIG>, in the method for manufacturing the structural coloration substrate <NUM> and <NUM> of <FIG>, the first pattern <NUM> is formed on the upper surface of the base substrate <NUM> using the quantum dot (step S81).

Here, when the upper substrate <NUM> is used for forming the first pattern <NUM>, forming the first pattern <NUM> (step S81) includes disposing the upper substrate <NUM> on the upper surface of the base substrate <NUM> (step S82) and forming the first pattern <NUM> on the upper substrate <NUM> using the quantum dot (step S83).

Here, after forming the first pattern <NUM> on the upper substrate <NUM> using the quantum dot, the upper substrate <NUM> having the first pattern <NUM> may be disposed or formed on the upper surface of the base substrate <NUM>.

The method for forming the first pattern <NUM> on the upper substrate <NUM> is same as explained above, and the upper substrate <NUM> having the first pattern <NUM> may be formed or disposed on the base substrate <NUM> via the imprinting, the attaching and so on.

Then, the light conversion structure <NUM> and <NUM> is formed on the base substrate <NUM> on which the first pattern <NUM> is formed (step S84).

Here, in forming the light conversion structure <NUM>, as explained referring to <FIG>, the structures <NUM>, <NUM>, <NUM> and <NUM> are formed to be protruded from the base frame <NUM>, and then the light conversion structure <NUM> is formed or disposed on the upper substrate <NUM>.

Alternatively, in forming the light conversion structure <NUM>, as explained referring to <FIG>, the structures <NUM>, <NUM>, <NUM> and <NUM> are formed to be intruded or concaved into the base frame <NUM>, and then the light conversion structure <NUM> is formed or disposed on the upper substrate <NUM>.

Then, at least one structural coloration layer <NUM> and <NUM> is stacked on the upper surface of the light conversion structure <NUM> and <NUM>. Here, the method for stacking the structural coloration layer <NUM> and <NUM>, and the material of the structural coloration layer <NUM> and <NUM> are same as explained above.

Then, the structural coloration substrates <NUM> and <NUM> of <FIG> are manufactured.

The structural coloration substrate is manufactured via each of the methods mentioned above example embodiments, and the structural coloration substrate may be manufactured as a security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> when the structural coloration substrate is used for the security. The structural coloration substrate, which is the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> (hereinafter, the security substrate) includes various colors and various arrangements, and thus the information on the colors and the arrangements is encrypted to be used for maintain the security. As mentioned above, the colors and the arrangements included in the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> may be variously changed according to each process for manufacturing the security substrate, and the same color and the same arrangement are only performed by the same process. Thus, if the specific manufacturing process, and the color and the arrangement performed by the specific manufacturing process are secured and protected, the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> having the same color and the same arrangement is impossible to be manufactured by a third party.

Accordingly, the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> manufactured by the method for manufacturing the structural coloration substrate as explained above may be used as a security verification system mentioned below, and then, the security verification system using the security substrate will be explained below.

<FIG> is a schematic view illustrating a non-claimed example of a security verification system using the structural coloration substrate manufactured by the method mentioned above according to the example embodiments of the present invention. <FIG> is a schematic view illustrating structural coloration substrate receiving the light in the security verification system of <FIG>.

Referring to the example of <FIG>, the security verification system <NUM> is the system for confirming and verifying a security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>.

The security verification system <NUM> includes the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>, and further includes a scanner <NUM>, an information acquisition part <NUM>, a deciding part <NUM>, a database <NUM> and an output part <NUM>.

The security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> includes a specific structural coloration pattern formed inside thereof and thus displays a specific color and pattern outwardly, and the specific color and pattern of the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> are encrypted and provided to the database <NUM>.

Here, the color and the pattern of the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> are changed according to the specific processes in manufacturing the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>, and thus the information on the specific processes in manufacturing the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> is also encrypted and provided to the database <NUM>.

In addition, the color displayed by the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> is also changed according to the angle of the incident light and the viewing angle, and thus the information on the color according to the angle is also encrypted and provided to the database <NUM>.

The scanner <NUM> is disposed over the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>, and scans the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>. Here, the scanner <NUM> includes a light emitting part <NUM> and a light receiving part <NUM>. Then, an incident light <NUM> from the light emitting part <NUM> is provided into the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>, and the light receiving part <NUM> receives a reflective light <NUM> reflected by the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>.

Then, the scanner <NUM> provides the information on the incident light <NUM> and the reflective light <NUM> to the information acquisition part <NUM>.

Here, the information acquisition part <NUM> may be implemented as an application (APP) for a mobile device such as a mobile phone, a tablet PC and so on, and thus the user may receive the information directly using the APP.

As explained above, the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> is manufactured to display various patterns and various colors, and thus scanner <NUM> may scan the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> by each pattern. That is, the scanner <NUM> obtains the information on the incident light <NUM> and the reflective light <NUM>, by each pattern.

In the example of <FIG>, if the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> is manufactured to have the checkerboard pattern, the areas obtained by the scanner in the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> may be divided into first to n areas <NUM>, <NUM>, <NUM>,.

Thus, when the information on the pattern of the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> is already provided to the database <NUM>, the scanner <NUM> scans the divided areas of the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> based on the pre-received information on the pattern of the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>.

Here, to scan the first to n areas <NUM>, <NUM>, <NUM>,. , <NUM> of the security substrate independently, the scanner <NUM> may include first to n sub-scanners <NUM>, <NUM>, <NUM>,. , <NUM> respectively scanning the first to n areas <NUM>, <NUM>, <NUM>,.

Accordingly, the first to n sub-scanner <NUM>, <NUM>, <NUM>,. , <NUM> respectively scan the first to n areas <NUM>, <NUM>, <NUM>,. , <NUM>, and then the information on the incident light <NUM> and the reflective light <NUM> at each area is obtained. Then, the obtained information is provided to the information acquisition part <NUM>.

Here, the number of the sub-scanners and the arrangement of the sub-scanners may be changed according to the number of the patterns and the arrangement of the patterns of the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>.

Referring to the method for manufacturing the structural coloration substrate mentioned above, the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> may be stacked or formed with various kinds of materials with various processes such as the coating, the inkjet printing, the imprinting and so on. Thus, the boundary area between the patterns of the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> may be blurred or be hard to be identified as the processes are additionally performed.

Even though the first area <NUM> and the second area <NUM> display the colors different from each other, the colors may not be clearly distinguished with each other with respect to a first boundary line <NUM>. The color displayed in the first area <NUM> and the color displayed in the second area <NUM> may be blurred, mixed or displayed with a gradation in the areas adjacent to the first boundary line <NUM>.

Thus, in the present example embodiment, when the first to n sub-scanners <NUM>, <NUM>, <NUM>,. , <NUM> respectively scan the first to n areas <NUM>, <NUM>, <NUM>,. , <NUM>), each of the first and n sub-scanners <NUM>, <NUM>, <NUM>,. , <NUM> scans a central portion of each of the first to n areas <NUM>, <NUM>, <NUM>,. , <NUM>, instead of scanning a boundary area thereof.

Thus, even though the colors are blurred, mixed or displayed with the gradation in the areas adjacent to the boundary line between the areas adjacent to each other, the scanned information may be more clearly and correctly obtained.

Accordingly, the scanner <NUM> provides the incident light <NUM> into each of the divided areas of the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> using the light emitting part <NUM>, and receives the reflective light <NUM> reflected on each of the divided areas using the light receiving part <NUM>. Then, the received information is provided into the information acquisition part <NUM>.

The information acquisition part <NUM> receives the information of the light emitting into the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> and the information of the light receiving from the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>, which are obtained by the scanner <NUM>, and then acquires the security pattern on the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>.

The information acquisition part <NUM> acquires the information on the pattern of the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> and the information on the color displayed at each of the areas divided by the pattern of the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>. Thus, the information acquisition part <NUM> derives the characteristics of the security pattern of the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> and the information of the color at each pattern.

The deciding part <NUM> compares the information on the security pattern obtained by the information acquisition part <NUM> to the information on the encrypted color and pattern of the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> provided by the database <NUM>, and then decides whether the scanned security substrate is coincided with the real or actual security substrate or not.

Here, in the deciding part <NUM>, the information on the shape of the arrangement of the pattern and the information on the color at each of the areas divided by the pattern are compared, and the decision criteria may be pre-determined. For example, the decision criteria may be more than <NUM>% coincidence or same in the shape of the arrangement of the pattern and more than <NUM>% coincidence or same in the color at each divided area.

Accordingly, the decision result by the deciding part <NUM> is outputted by the output part <NUM>, and then the authenticity of the scanned security substrate may be confirmed or identified by the user.

<FIG> is a schematic view illustrating a scanner, not part of the invention, rotated to scan the structural coloration substrate (security substrate) in the exemplary security verification system of <FIG>.

As explained above in the method for manufacturing the structural coloration substrate, the color displayed by the security substrate is changed according to the angle of the incident light and the viewing angle by the user. Here, the viewing angle may mean the angle of the incident light.

In addition, the information on the change of the color according to the angle of the incident light, is not changed after the security substrate is completely manufactured, and thus the information is pre-stored at the database <NUM>.

To perform the verification of the security substrate more correctly and more increased reliability, the scanning on the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> may be performed according to the angle of the incident light, and then the comparison of the information on the pattern and the color of the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> may be performed according to the angle of the incident light.

In the example of <FIG>, the scanner <NUM> rotates with respect to a central axis and thus the scanner <NUM> rotates with respect to the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>.

As the scanner <NUM> rotates, the angle of the incident light <NUM> incident into the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> is changed, and thus the information of the color on the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> obtained by the reflective light <NUM> may be also changed.

Thus, if the information of the color on the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> changed according to the angle of the incident light is pre-stored in the database <NUM>, the information of the color on the scanned security substrate changed according to the angle of the incident light may be compared with the pre-stored information and then the authenticity of the scanned security substrate may be confirmed or identified more correctly and more reliably.

Alternatively, although not shown in the figure, instead of rotating the scanner <NUM>, the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> may be rotated with respect to the scanner <NUM>, to change the angle of the incident light. In this case, the authenticity of the scanned security substrate may be confirmed or identified via the above-mentioned process or method.

Here, the rotation of the scanner <NUM> or the rotation of the authenticity of the scanned security substrate may be confirmed or identified may be temporarily performed only when the incident light is provided, that is only when the information on the security substrate <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> is obtained. Thus, the authenticity of the scanned security substrate may be confirmed or identified with enhanced security and reliability.

Accordingly, the additional criteria to decide whether the security substrate is authentic or not is considered or selected, so that the verification on the security substrate may be performed more strictly to increase the security and the reliability.

In addition to merely stacking the structural coloration layers, the structural coloration substrate may be formed using the quantum dot. Here, the structural coloration substrate has a various and complex pattern according to the pattern of the quantum dot, and thus the light having various kinds of colors may exit according to the direction of the incident light in the structural coloration substrate.

In addition, the structural coloration substrate may be formed using the quantum dot and the light conversion structure having at least one structure. Here, a various and complex pattern may be formed according to the pattern of the quantum dot and the shape or the arrangement of the structures of the light conversion structure, and thus the light having various kinds of colors may exit according to the direction of the incident light in the structural coloration substrate.

Here, the light conversion structure may be formed to be protruded from or be inwardly concaved from the base frame, and may include patterns extending along a direction or being arranged with various shapes. Thus, the security pattern may be diversified. In addition, as for the light conversion structure, a vertical cross-sectional shape may be a triangle, and combination of inner angles thereof may be diversified. Thus, the color externally displayed may be diversified to enhance encryption of the security pattern more effectively.

In addition, the quantum dot used pattern may be formed as an encrypted code such as the dot pattern, the longitudinal pattern and the checkerboard pattern. Here, the forming or the manufacturing the pattern may be performed more easily or more efficiently. The structural coloration layer may be stacked via an atomic layer deposition, and thus the coating may be performed to have a relatively fine thickness in a range about tens of nano meters and the effect of the structural coloration may be maintained. Thus, the structural coloration substrate may be effectively used for the moneys or the barcodes.

In addition, the protective layer is coated on an uppermost surface, and thus the encrypted security pattern may be prevented from being easily damaged. Thus, the security and the durability of the security pattern may be increased.

The structural coloration substrate having the quantum dot, the structural coloration layer and the light conversion structure may be easily manufactured, and thus various kinds of patterns may be included and the productivity and the manufacturing efficiency may be increased.

Claim 1:
A method for manufacturing a structural coloration substrate (<NUM>), the method comprising:
forming (S12) an upper substrate (<NUM>) on a base substrate (<NUM>);
forming (S13) a first pattern (<NUM>) displaying a first color (A) in the upper substrate (<NUM>), using a quantum dot; and
stacking (S14) at least one structural coloration layer (<NUM>) on the upper surface of the upper substrate;
wherein the first color (A) of the first pattern (<NUM>) is changed and displayed, as the at least one structural coloration layer (<NUM>) is stacked,
characterised in that the first pattern is embedded in an inside from an upper surface of the upper substrate.