CN116018534A - Color-changeable structure and electronic device - Google Patents

Abstract

A variable color structure comprising: a substrate; a color modulation layer disposed on the substrate so as to provide at least two colored lights and including no more than five thin films; and a coloring layer on the color modulation layer. The embodiments are capable of minimizing any increase in thickness of an electronic device by means of a color modulation layer comprising a minimum number and/or minimum thickness of thin films in order to achieve multiple colored lights.

Description

Variable color structure and electronics

technical field

Embodiments relate to a variable color structure and an electronic device.

Background technique

With entering the modern society, consumers are more and more interested in color. In view of this interest, recently, the purchasing power of electronic devices can be increased by providing color members inside and outside of various electronic devices.

Color coating technology, which is most aesthetically appealing to consumers, is widely used in mobile devices and consumer electronics, automotive interior and exterior materials, and architectural interior and exterior materials.

In the existing color structure, since the color modulation layer (color modulation layer) that causes the color shift (color shift) must be composed of six or more thin films, there is a problem that not only the thickness is increased, but also the process is complicated and the process time is increased. question.

In addition, in the existing color structure, there is a problem of difficulty in mass production due to reduced production efficiency caused by performing different process methods for each process unit.

Contents of the invention

technical problem

It is an object of embodiments to address the foregoing and other problems.

Another object of the present embodiment is to provide a variable color structure and electronic device capable of reducing thickness.

Another object of this embodiment is to provide a variable color structure and electronic device capable of providing at least two different colored lights.

Another object of this embodiment is to provide a mass-producible variable color structure and electronic device.

Technical solutions

According to an aspect of an embodiment aimed at achieving the above or other objects, the variable color structure includes: a substrate; a color modulation layer comprising less than five thin films disposed on the substrate to provide at least two or more colored lights; and a colored layer on the color modulation layer.

According to another aspect of the embodiment, an electronic device includes: a main body; and a variable color structure disposed on at least one side of the main body.

technical effect

Effects of the variable color structure and electronic device according to the embodiment are described as follows.

According to at least one of the embodiments, there is an advantage of being able to realize an aesthetically colored light that can greatly appeal to the senses of consumers.

According to at least one of the embodiments, there is an advantage that thickness increase of the electronic device can be minimized by including a color modulation layer having a minimum number and/or minimum thickness of thin films for realizing various colored lights.

According to at least one of the embodiments, there is an advantage that various colored lights can be realized.

According to at least one of the embodiments, the pattern layer is provided on one surface of the substrate, and two or more kinds of colored lights generated from the color modulation layer are emitted to the outside with a wider emission angle, so that the variable color structure The emitted two or more colored lights can be seen with a greater variety of viewing angles. Therefore, the embodiment has an advantage of increasing consumers' purchasing power for an electronic device employing the variable color structure 100 and being aesthetically most appealing to consumers' senses.

According to at least one of the embodiments, there is an advantage that mass production is possible since all unit processes are performed based on a roll-to-roll process.

Further scope of applicability of the embodiments will become apparent from the following detailed description. However, since various changes and modifications within the spirit and scope of the present embodiments can be clearly understood by those skilled in the art, it should be understood that the detailed description and specific embodiments such as the preferred embodiments are given by way of illustration only. .

Description of drawings

FIG. 1 is a cross-sectional view illustrating a variable color structure according to an embodiment.

FIG. 2 shows a state in which colored lights having different wavelengths are provided in the color modulation layer of FIG. 1 .

Fig. 3 shows a color modulation layer according to a first embodiment.

FIG. 4 is a graph showing reflectance according to wavelength in the color modulation layer according to the first embodiment.

Fig. 5 shows a color modulation layer according to a second embodiment.

FIG. 6 is a graph showing reflectance according to wavelength in the color modulation layer according to the second embodiment.

FIG. 7 is a cross-sectional view showing a color modulation layer according to a third embodiment.

FIG. 8 is a graph showing reflectance according to wavelength in the color modulation layer according to the third embodiment.

FIG. 9 is a cross-sectional view showing a color modulation layer according to a fourth embodiment.

FIG. 10 is a graph showing reflectance and transmittance according to wavelengths in the color modulation layer according to the fourth embodiment.

FIG. 11 is a cross-sectional view showing a color modulation layer according to a fifth embodiment.

FIG. 12 is a graph showing reflectance and transmittance according to wavelengths in the color modulation layer according to the fifth embodiment.

Figure 13 illustrates a method for generating variable color structures according to an embodiment.

FIG. 14 shows the patterning process of FIG. 13 .

FIG. 15 shows the printing process of FIG. 13 .

Figure 16 is an embodiment of color according to wavelength, brightness and saturation.

Fig. 17 shows an example of allowing target colors.

Fig. 18 shows an example where target colors are not allowed.

Detailed ways

Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, the technical idea of the present disclosure is not limited to some of the described embodiments, but may be implemented in various forms, and if within the scope of the technical idea of the present disclosure, components in multiple embodiments One or more can be used by being selectively combined and replaced. In addition, unless specifically defined and described explicitly, terms (including technical terms and scientific terms) used in the embodiments of the present disclosure may be interpreted with meanings that can be generally understood by those of ordinary skill in the art to which the present disclosure belongs, and such terms as dictionaries Commonly used terms of the terms defined in may be interpreted in consideration of contextual meanings of related technologies. In addition, terms used in the embodiments of the present disclosure are for describing the embodiments and are not intended to limit the present disclosure. In this specification, unless otherwise specified in the phrase, the singular form may also include the plural form, and when it is described as "at least one (or one or more) of B and C", it may include A One or more of any combination of , B and C combined. Also, terms such as first, second, A, B, (a) and (b) may be used to describe components of the embodiments of the present disclosure. These terms are only used to distinguish a component from other components, and the terms are not limited to the properties, order or sequence of the corresponding components. In addition, when a component is described as being "connected", "coupled" or "joined" to another component, it may not only include the situation that the component is directly "connected", "coupled" or "joined" to another component , can also include the situation where the component is "connected", "coupled" or "bonded" to another component by having one component. In addition, when it is described as being formed or provided on the "top (upper part) or bottom (lower part)" of each component, it may include not only the case where two components are in direct contact with each other, but also the case where another component is formed or provided on both sides. situation between components. In addition, when expressed as "up" or "down", not only the meaning of an upward direction based on one component but also the meaning of a downward direction may be included.

FIG. 1 is a cross-sectional view illustrating a variable color structure according to an embodiment.

Referring to FIG. 1 , a variable color structure 100 according to an embodiment may include a substrate 110 , a color modulation layer 120 and a coloring layer 130 .

For example, the substrate 110 may be used to support the variable color structure 100 . Accordingly, the substrate 110 may be formed of a material having excellent support strength. For example, the substrate 110 may cause at least two or more colored lights generated in the variable color structure 100 to be emitted to the outside. Accordingly, the substrate 110 may be formed of a material having excellent transmittance. For example, the substrate 110 may be formed of a transparent plastic material. For example, the substrate 110 may be formed of a transparent resin material.

The color modulation layer 120 may be disposed on the substrate 110 . The color modulation layer 120 can be used to generate at least two colored lights. For example, the color modulation layer 120 may refract colored light of a specific wavelength range to generate at least two colored lights having different wavelength ranges according to viewing angles. The viewing angle is an angle at which the variable color structure 100 is viewed from the front of the variable color structure 100 , which may be an angle of one of 0 to 180 degrees with respect to the surface of the variable color structure 100 . For example, the viewing angle from the front perpendicular to the surface of the variable color structure 100 may be 90 degrees.

For this, the color modulation layer 120 may be formed of a material having a predetermined refractive index. For example, the color modulation layer 120 may include at least one or more thin films (1110 of FIG. 3, 1210 of FIG. 5, 1310 to 1330 of FIG. 7, 1410 to 1430 of FIG. 9, 1510 to 1530 of FIG. 11). Therefore, the color modulation layer 120 may be based on at least one or more thin films (1110 of FIG. 3, 1210 of FIG. 5, 1310 to 1330 of FIG. 7, 1410 to 1430 of FIG. 9, 1510 of FIG. to 1530) to generate at least two or more colored lights by overlapping or splitting at least two to three wavelength ranges within a wavelength range corresponding to visible light.

In one embodiment, the color modulation layer 120 may generate at least two or more kinds of colored lights and include five or less thin films. For example, the number of films may be one to five. Among five or less films, the lowermost film and the uppermost film may be adhesive members, and the remaining films may be refractive members. For example, the lowermost member may contact the substrate 110 and the uppermost thin film may contact the colored layer 130 . At this time, the lowermost film and the uppermost film may be refractive members. In another example, five or fewer films may be refractive members.

As shown in FIG. 2 , for example, the color modulation layer 120 may include a first film 121 to a third film 123 .

For convenience, FIG. 2 shows three membranes 121 to 123, but an embodiment may have two or fewer membranes or four or more membranes.

The first thin film 121 has a first refractive index, the second thin film 122 has a second refractive index, and the third thin film 123 may have a third refractive index. For example, the first to third refractive indices may be different from each other. For example, the first index of refraction may be different from the second index of refraction, and may be the same as the third index of refraction. For example, the second refractive index may be greater than the first or third refractive index, but is not limited thereto.

The first film 121 has a first thickness, the second film 122 has a second thickness, and the third film 123 may have a third thickness. For example, the first thin film 121 to the third thin film 123 may have a thickness of 10 nanometers to several tens of micrometers, respectively. For example, the first to third thicknesses may be different from each other. For example, the first thickness may be different from the second thickness, and may be the same as the third thickness. For example, the second thickness may be greater than the first thickness or the third thickness, but is not limited thereto.

For example, the first colored light with the first wavelength range λ1 is refracted when passing through the third film 123 and the second film 122 of the color modulation layer 120, and is not incident on the first film 121, but on the first film 121 It is reflected again at the boundary surface between the second film 122 and the second film 122 and the third film 123 and is refracted again. Thus, second colored light having a second wavelength range λ2 can be generated. Therefore, when viewing the variable color structure 100 at the first viewing angle, the second colored light having the second wavelength range λ2 can be seen.

For example, the first colored light having the first wavelength range λ1 may be refracted while passing through the third film 123 , the second film 122 and the first film 121 of the color modulation layer 120 . The first colored light may be reflected at a boundary surface between the first film 121 and the substrate 110 and refracted by the first film 121 , the second film 122 and the third film 123 again. Thus, third colored light having a third wavelength range λ3 can be generated. Therefore, when viewing the variable color structure 100 from the second viewing angle, the third colored light having the third wavelength range λ3 can be seen.

As shown in FIG. 2, through the color modulation layer 120 including the first thin film 121 to the third thin film 123, the first colored light having the first wavelength range λ1 can be generated into the second colored light having the second wavelength range λ2 and a third colored light having a third wavelength range λ3.

Therefore, at least two or more kinds of films having different wavelength ranges may be generated according to the number of films included in the color modulation layer 120, the refractive index of each film, the thickness of each film, the material type of each film, etc. colored light.

The coloring layer 130 may be disposed on the color modulation layer 120 . The coloring layer 130 may be used for tone or luster in terms of design. For example, the colored layer 130 may be displayed in white or black.

On the other hand, the variable color structure 100 according to this embodiment may include a pattern layer 140 .

For example, the pattern layer 140 can make the incident colored light incident on the substrate 110 or the color modulation layer 120 at a wider incident angle.

For example, the pattern layer 140 may cause two or more kinds of colored lights generated at the color modulation layer 120 to be emitted to the outside at a more extended angle. Therefore, since the two or more colored lights emitted from the variable color structure 100 are viewed from more diverse viewing angles, consumers' purchasing power for electronic devices employing the variable color structure 100 is increased, and Aesthetically most appealing to the senses of consumers.

The pattern layer 140 may include a plurality of patterns 145 . The shape, size, height, etc. of the pattern 145 may be randomly formed.

As shown above, the pattern layer 140 may be patterned in one direction. For example, the pattern layer 140 may include a stripe pattern patterned in a vertical direction.

As shown above, the pattern layer 140 may be patterned in horizontal and vertical directions. For example, the pattern layer 140 may include a checkered pattern.

As another example, the pattern layer 140 may be disposed between the substrate 110 and the color modulation layer 120 . For example, the color modulation layer 120 may be formed on the pattern layer 140 after the pattern layer 140 is formed on the substrate 110 . If the thickness of each film of the color modulation layer 120 is smaller than the height of the patterns 145 of the pattern layer 140, at least one film of the color modulation layer 120 may be disposed between the patterns 145 of the pattern layer 140, but is not limited thereto. In this case, at least one thin film of the color modulation layer 120 is provided in a shape corresponding to the shape of the pattern 145 of the pattern layer 140 . In the color modulation layer 120, the number of films, the refractive index of each film, the thickness of each film, the material type of each film, and the curved shape of the film caused by the pattern 145 of the pattern layer 140 are added, and then, it is possible to Generate more kinds of colored light.

The pattern layer 140 may be referred to as an irregular structure, a bend, an uneven layer, or the like.

[first embodiment]

Fig. 3 shows a color modulation layer according to a first embodiment.

Referring to FIG. 3 , the color modulation layer 120 according to the first embodiment may include a thin film 1110 for generating gray light or silver light according to a viewing angle.

For example, thin film 1110 may include TiO ₂ and Nb ₂ O ₅ . For example, thin film 1110 may have a thickness of 50 nanometers to 70 nanometers. The thickness of the thin film 1110 for realizing the waveform of the target color may be variable within a range of ±3%, for example. If the thickness of the thin film 1110 is outside the range of ±3%, the peak wavelength may shift within the wavelength range corresponding to visible light.

By the material and thickness of the thin film 1110 included in the color modulation layer 120 according to the first embodiment, gray light or silver light may be generated according to viewing angles.

FIG. 4 is a graph showing reflectance according to wavelength in the color modulation layer according to the first embodiment.

Reflectance may vary within a wavelength range corresponding to visible light by the material and thickness of the thin film 1110 included in the color modulation layer 120 according to the first embodiment.

As shown in FIG. 4 , the color modulation layer 120 according to the first embodiment may have a peak reflectance 1151 in a wavelength range of 450 nm to 480 nm among wavelength ranges corresponding to visible light. For example, the wavelength range corresponding to visible light may be 380nm to 780nm, but is not limited thereto.

In addition, in the color modulation layer 120 according to the first embodiment, the reflectance may decrease as the wavelength decreases or the wavelength increases according to the peak reflectance 1151 . For example, according to peak reflectivity 1151, the reflectivity may decrease toward 380 nanometers and toward 750 nanometers. For example, according to the peak reflectivity 1151, the slope of the reflectivity as the wavelength decreases may be greater than the slope of the reflectivity as the wavelength increases.

Therefore, as shown in FIG. 4, by the material and thickness of the thin film 1110 of the color modulation layer 120 according to the first embodiment, the variable state of the reflectance is changed according to the peak reflectance 1151, and by the changed reflectance The variable state of the , can generate gray light or silver light depending on the viewing angle.

[Second Embodiment]

Fig. 5 shows a color modulation layer according to a second embodiment.

Referring to FIG. 5 , the color modulation layer 120 according to the second embodiment may include a thin film 1210 for generating cyan light or gold light according to a viewing angle.

For example, thin film 1210 may include TiO ₂ and Nb ₂ O ₅ . For example, thin film 1210 may have a thickness of 70 nanometers to 100 nanometers. The thickness of the thin film 1210 for realizing the waveform of the target color may be variable within a range of ±3%, for example. If the thickness of the thin film 1210 is outside the range of ±3%, the peak wavelength may shift within the wavelength range corresponding to visible light.

By the material and thickness of the thin film 1210 included in the color modulation layer 120 according to the second embodiment, cyan light or golden light may be generated according to viewing angles.

FIG. 6 is a graph showing reflectance according to wavelength in the color modulation layer according to the second embodiment.

Reflectance may vary within a wavelength range corresponding to visible light by the material and thickness of the thin film 1210 included in the color modulation layer 120 according to the second embodiment.

As shown in FIG. 6 , the color modulation layer 120 according to the second embodiment may have a valley reflectance 1251 in a wavelength range of 420 nm to 450 nm among wavelength ranges corresponding to visible light. For example, the wavelength range corresponding to visible light may be 380nm to 780nm, but is not limited thereto.

In addition, in the color modulation layer 120 according to the second embodiment, the reflectance may increase as the wavelength decreases or the wavelength increases according to the valley reflectance 1251 . According to the valley reflectivity 1251, for example, the reflectivity may increase towards 380 nanometers and may increase towards 750 nanometers. For example, according to the valley reflectivity 1251, the slope of the reflectivity as the wavelength decreases may be greater than the slope of the reflectivity as the wavelength increases.

Therefore, as shown in FIG. 6 , by the material and thickness of the thin film 1210 of the color modulation layer 120 according to the second embodiment, the variable state of the reflectance is changed according to the valley reflectance 1251 . Due to the variable state of the altered reflectivity, either cyan or gold light can be generated depending on the viewing angle.

[Third Embodiment]

FIG. 7 is a cross-sectional view showing a color modulation layer according to a third embodiment.

Referring to FIG. 7 , the color modulation layer 120 according to the third embodiment may include a first film 1310 to a third film 1330 for generating violet light or yellow light according to viewing angles.

For example, the first thin film 1310 is disposed on the substrate 110 , the second thin film 1320 is disposed on the first thin film 1310 , and the third thin film 1330 may be disposed on the second thin film 1320 .

For example, each of the first thin film 1310 and the third thin film 1330 may include Nb ₂ O ₅ , and the second thin film 1320 may include SiO ₂ . For example, the thickness of the first thin film 1310 is 5 nm to 25 nm, the thickness of the second thin film 1320 is 80 nm to 100 nm, and the thickness of the third thin film 1330 may be 5 nm to 25 nm.

The thickness of each of the thin film 1310, the thin film 1320, and the thin film 1330 for realizing the waveform of the target color may be variable (for example, within a range of ±3%). If the thickness of each of the thin film 1310, the thin film 1320, and the thin film 1330 is outside the range of ±3%, the peak wavelength may shift within a wavelength range corresponding to visible light.

For example, the first film 1310 may be different from the second film 1320 and may be the same as the third film 1330, but is not limited thereto.

For example, the first thin film 1310 and the third thin film 1330 have a high refractive index, and the second thin film 1320 may have a low refractive index.

For example, the first film 1310 may be an attachment member for attachment to the substrate 110 , and the third film 1330 may be an attachment member for attachment to the colored layer 130 .

Due to the material and thickness of each of the first to third films 1310 to 1330 included in the color modulation layer 120 according to the third embodiment, purple light or yellow light may be generated according to viewing angles.

FIG. 8 is a graph showing reflectance according to wavelength in the color modulation layer according to the third embodiment.

Reflectance may vary within a wavelength range corresponding to visible light by the material and thickness of a thin film included in the color modulation layer 120 according to the third embodiment.

As shown in FIG. 8 , the color modulation layer 120 according to the third embodiment may have a valley reflectance 1351 in a wavelength range of 600 nm to 750 nm among wavelength ranges corresponding to visible light. For example, the wavelength range corresponding to visible light may be 380nm to 780nm, but is not limited thereto.

In addition, in the color modulation layer 120 according to the third embodiment, the reflectance may increase as the wavelength decreases according to the valley reflectance 1351 . For example, according to the valley reflectivity 1351, the reflectivity may increase towards 380 nanometers. For example, valley reflectivity 1351 may remain constant over a wavelength range of 600 nm to 750 nm.

Therefore, as shown in FIG. 8 , the variable state of the reflectance may be changed according to the valley reflectance 1351 by the material and thickness of the thin film of the color modulation layer 120 according to the third embodiment. Due to the variable state of the altered reflectivity, either violet or yellow light can be generated depending on the viewing angle.

[Fourth embodiment]

FIG. 9 is a cross-sectional view showing a color modulation layer according to a fourth embodiment.

Referring to FIG. 9 , the color modulation layer 120 according to the fourth embodiment may include a first film 1410 to a third film 1430 for generating pink light, orange light, or red light according to viewing angles according to the fourth embodiment.

For example, the first thin film 1410 is disposed on the substrate 110 , the second thin film 1420 is disposed on the first thin film 1410 , and the third thin film 1430 may be disposed on the second thin film 1420 .

For example, each of the first thin film 1410 and the third thin film 1430 may include Nb ₂ O ₅ , and the second thin film 1420 may include SiO ₂ . For example, the thickness of the first thin film 1410 is 35 nm to 55 nm, the thickness of the second thin film 1420 is 200 nm to 250 nm, and the thickness of the third thin film 1430 may be 35 nm to 55 nm.

The thickness of each of the thin film 1410, the thin film 1420, and the thin film 1430 for realizing the waveform of the target color may be variable (for example, within a range of ±3%). If the thickness of each of the thin film 1410, the thin film 1420, and the thin film 1430 is outside the range of ±3%, the peak wavelength may shift within a wavelength range corresponding to visible light.

For example, the first film 1410 may be different from the second film 1420 and may be the same as the third film 1430, but is not limited thereto.

For example, the first thin film 1410 and the third thin film 1430 have a high refractive index, and the second thin film 1420 may have a low refractive index.

For example, the first film 1410 is an attachment member for attachment to the substrate 110 , and the third film 1430 may be an attachment member for attachment to the colored layer 130 .

By the material and thickness of each of the first to third films 1410 to 1430 included in the color modulation layer 120 according to the fourth embodiment, pink light, orange light, or red light may be generated according to viewing angles.

FIG. 10 is a graph showing reflectance and transmittance according to wavelengths in the color modulation layer according to the fourth embodiment.

Reflectance may vary within a wavelength range corresponding to visible light by the material and thickness of a thin film included in the color modulation layer 120 according to the fourth embodiment.

As shown in FIG. 10 , the color modulation layer 120 according to the fourth embodiment may have a first valley reflectance 1451 in a wavelength range of 410 nm to 460 nm among wavelength ranges corresponding to visible light. For example, the wavelength range corresponding to visible light may be 380nm to 780nm, but is not limited thereto. The color modulation layer 120 according to the fourth embodiment may have a peak reflectance 1452 in a wavelength range of 480 nm to 520 nm among wavelength ranges corresponding to visible light. The color modulation layer 120 according to the fourth embodiment may have a second valley reflectance 1453 in a wavelength range of 650 nm to 680 nm among wavelength ranges corresponding to visible light.

For example, the second valley reflectivity 1453 may be greater than the first valley reflectivity 1451 . For example, peak reflectivity 1452 may be greater than second valley reflectivity 1453 . For example, according to peak reflectivity 1452, the slope of the reflectivity as the wavelength decreases may be greater than the slope of the reflectivity as the wavelength increases.

The color modulation layer 120 according to the fourth embodiment may have a first peak transmittance 1461 in a wavelength range of 410 nm to 460 nm among wavelength ranges corresponding to visible light. The color modulation layer 120 according to the fourth embodiment may have a valley transmittance 1462 in a wavelength range of 480 nm to 520 nm among wavelength ranges corresponding to visible light. The color modulation layer 120 according to the fourth embodiment may have a second peak transmittance 1463 in a wavelength range of 650 nm to 680 nm among wavelengths corresponding to visible light.

For example, the first peak transmittance 1461 may be greater than the second peak transmittance 1463 .

For example, valley transmittance 1462 may be less than peak reflectivity 1452 and greater than first valley reflectivity 1451 or second valley reflectivity 1453 . For example, peak reflectance 1452 is greater than valley transmittance 1462 and may be less than first peak transmittance 1461 or second peak transmittance 1463 .

Therefore, as shown in FIG. 10 , by the material and thickness of the thin film of the color modulation layer 120 according to the fourth embodiment, the variable state of the reflectance can be according to the first valley reflectance 1451 and the second valley reflectance 1453. and peak reflectivity 1452 changes. In addition, the variable state of the transmittance can be changed according to the first peak transmittance 1461 and the second peak transmittance 1463 and the valley transmittance 1462 by the material and thickness of the thin film of the color modulation layer 120 according to the fourth embodiment. Due to the variable state of reflectance and the variable state of transmittance, pink, orange, or red light can be generated depending on the viewing angle.

[Fifth Embodiment]

FIG. 11 is a cross-sectional view showing a color modulation layer according to a fifth embodiment.

Referring to FIG. 11 , the color modulation layer 120 according to the fourth embodiment may include a first film 1510 to a third film 1530 for generating yellow light, green light, or blue light according to viewing angles according to the fifth embodiment.

For example, the first thin film 1510 is disposed on the substrate 110 , the second thin film 1520 is disposed on the first thin film 1510 , and the third thin film 1530 may be disposed on the second thin film 1520 .

For example, the first thin film 1510 and the third thin film 1530 may include Nb ₂ O ₅ , and the second thin film 1520 may include SiO ₂ . For example, the thickness of the first thin film 1510 is 35 nm to 55 nm, the thickness of the second thin film 1520 is 240 nm to 270 nm, and the thickness of the third thin film 1530 may be 55 nm to 75 nm.

The thickness of each of the thin film 1510, the thin film 1520, and the thin film 1530 for realizing the waveform of the target color may be variable (for example, within a range of ±3%). If each of the thicknesses of the thin film 1510, the thin film 1520, and the thin film 1530 is outside the range of ±3%, the peak wavelength may shift within a wavelength range corresponding to visible light.

For example, the first film 1510 may be different from the second film 1520, and may be the same as the third film 1530, but is not limited thereto.

For example, the first thin film 1510 and the third thin film 1530 have a high refractive index, and the second thin film 1520 may have a low refractive index.

For example, the first film 1510 is an attachment member for attachment to the substrate 110 , and the third film 1530 may be an attachment member for attachment to the colored layer 130 .

By the material and thickness of each of the first to third films 1510 to 1530 included in the color modulation layer 120 according to the fifth embodiment, yellow light, green light, or blue light is generated according to viewing angles.

FIG. 12 is a graph showing reflectance and transmittance according to wavelengths in the color modulation layer according to the fifth embodiment.

Reflectance may vary within a wavelength range corresponding to visible light by the material and thickness of a thin film included in the color modulation layer 120 according to the fifth embodiment.

As shown in FIG. 12 , the color modulation layer according to the fifth embodiment may have a peak reflectance 1551 in a wavelength range of 420 nm to 450 nm among wavelength ranges corresponding to visible light. For example, the wavelength range corresponding to visible light may be 380nm to 780nm, but is not limited thereto. The color modulation layer 120 according to the fifth embodiment may have a valley reflectance 1552 in a wavelength range of 570 nm to 610 nm among wavelength ranges corresponding to visible light.

For example, peak reflectivity 1551 may be greater than valley reflectivity 1552 .

The color modulation layer 120 according to the fifth embodiment may have a valley transmittance 1651 in a wavelength range of 420 nm to 450 nm among wavelength ranges corresponding to visible light. The color modulation layer 120 according to the fifth embodiment may have a peak transmittance 1652 in a wavelength range of 570 nm to 610 nm among wavelength ranges corresponding to visible light.

For example, peak transmittance 1652 may be greater than valley transmittance 1651 .

For example, peak reflectance 1551 may be greater than valley transmittance 1651 and may be less than peak transmittance 1652 . For example, valley reflectance 1552 may be less than valley transmittance 1651 or peak transmittance 1652 .

Therefore, as shown in FIG. 12 , the variable state of the reflectance can be changed according to the valley reflectance 1552 and the peak reflectance 1551 by the material and thickness of the film of the color modulation layer 120 according to the fifth embodiment. In addition, the variable state of the transmittance may be changed according to the peak transmittance 1652 and the valley transmittance 1651 through the material and thickness of the thin film of the color modulation layer 120 . Due to the variable state of the reflectance and the variable state of the transmittance, yellow, green, or blue light can be generated depending on the viewing angle.

Figure 13 illustrates a method for generating a variable color structure according to one embodiment.

As shown in FIG. 1 and FIG. 13 , the method for producing the variable color structure 100 according to one embodiment may include a process S510 of forming a pattern layer 140 on a substrate 110, a process of forming a color modulation layer 120 on a substrate 110. S520, a process S530 of forming the colored layer 130 on the color modulation layer 120 and a cutting process S540.

According to one embodiment, each of the processes S510 to S540 may be performed by a roll-to-roll process. In the roll-to-roll process, rollers are arranged on both sides, and after the product to be processed is accommodated at the input-side roller and the corresponding process is performed, the product on which the process has been performed is wound around the output-side roller . Therefore, it can be used in the next process.

Specifically, each process (S510 to S540) will be described.

[Pattern Layer 140 Formation Process (510)]

For example, the substrate 110 may be wound on a roller 410 . Since the substrate 110 is flexible, it can be easily rolled up to the roller 410 . Roller 410 may be detachable or attached. Accordingly, the roll 410 on which the substrate 110 is wound is received and installed, or the roll 410 on which the substrate 110 is completely unwound can be detached and moved to a previous process (for example, the winding of the substrate 110). process).

The substrate 110 released from the roller 410 may move in one direction, such as a left direction.

A pattern layer 140 including a plurality of patterns 145 may be formed on one side of the substrate 110 .

As shown in FIG. 14 , a UV or heat-cured coating film 201 is applied on one side of a substrate 110 using a coating device 310, and an imprint is made on the applied coating film 201 using a pattern roller 312. A plurality of patterns 145, so that the pattern layer 140 can be formed. The formed pattern layer 140 may be dried and cured using the heater 314 .

The substrate 110 on which the pattern layer 140 is formed by using a drying and curing process may be wound on an output side roll (not shown).

FIG. 1 shows that the pattern layer 140 is formed on the lower surface of the substrate 110 , but may be formed on the upper surface of the substrate 110 .

[Color Modulation Layer 120 Formation Process (520)]

The output-side roll on which the substrate 110 on which the pattern layer 140 forming process 510 is performed is wound may be accommodated for the color modulation layer 120 forming process 520 . In this case, the output side rollers may be input side rollers.

Thereafter, the substrate 110 released from the roller moves in one side direction, and a process of forming the color modulation layer 120 on the substrate 110 may be performed.

For example, several deposition processes may be performed to form the color modulation layer 120 stacked with a low refractive index and a high refractive index. For example, a sputter deposition process can be used to deposit high melting point materials.

For example, several coating processes using a coating agent may be performed to form the color modulation layer 120 in which low and high refractive indices are laminated. For example, the coating agent 201 may include a ceramic material such as an organic-inorganic hybrid, sol-gel, having a size of nanometer to several tens of micrometers. For example, the coating agent 201 may be a nano-dispersion containing a dispersant, a binder, etc. in an organic solvent such as alcohol, methyl chloride, or the like.

For example, after formulating a dispersant in a solvent, a coating process may be performed by a ball mill, a dyno mill, or the like using a coating agent prepared with an abrasive having a solid content of 10% to 40%. For example, the coating process may be performed using a coating agent prepared by being added to a resin such as a binder. For example, the coating process may be performed by a slot die, micro-gravure, or gravure process.

The substrate 110 formed with the color modulation layer 120 may be wound on an output side roll (not shown).

1 shows that the color modulation layer 120 is formed on the opposite side of the substrate 110 on which the pattern layer 140 is formed, but the color modulation layer 120 may be formed on the pattern layer 140 .

[Colored layer forming process (530)]

The output side roller may be accommodated for the coloring layer forming process 530 . The substrate 110 on which the color modulation layer 120 forming process 520 has been performed may be wound around output-side rolls. In this case, the output side rollers may be input side rollers.

Thereafter, the substrate 110 released from the roller is moved in one side direction, and a process of forming the colored layer 130 on the substrate 110 may be performed.

As shown in FIG. 15, the coloring layer 130 forming process may be performed using a printing process.

The substrate 110 released from the rollers may move in one direction by the first to third rollers 411 to 413 . A first ink roller 421 and a second ink roller 422 may be provided. A portion of the first ink roller 421 is immersed in a first tank 431 , and some surfaces may contact the first roller 411 . The second ink roller 422 is immersed in the second cylinder 432 and some surfaces may contact the third roller 413 .

The first ink roller 421 may also be rotated by the rotation of the first roller 411 . Through the rotation of the first ink roller 421 , the ink solution 440 of the first tank 431 may be rotated along the surface of the first ink roller 421 . Through the rotation of the first roller 411 , the substrate 110 can move through between the first roller 411 and the first ink roller 421 . In this case, the ink solution 440 coated on the surface of the first ink roller 421 may be printed on the color modulation layer 120 .

Similarly, the second ink roller 422 can also be rotated by the rotation of the third roller 413 . Through the rotation of the second ink roller 422 , the ink solution 440 of the second tank 432 may rotate along the surface of the second ink roller 422 . Through the rotation of the third roller 413 , the substrate 110 can move through between the third roller 413 and the second ink roller 422 . In this case, the ink solution 440 coated on the surface of the second ink roller 422 may be printed on the color modulation layer 120 . For example, it is possible to print a color or primer (in one or two prints) through the ink solution 440 . The number of printings can be up to 10 consecutive printings.

In one embodiment, it is described that two printing processes are performed, but only one printing process or three or more printing processes may be performed.

For example, a continuous manufacturing process using a microgravure or intaglio process can be performed. For continuous manufacturing, special ink with reliable safety is adopted. For example, for reliable safety, by using acrylic, urethane, etc. as a base resin, a stabilizer such as a pigment including TiO ₂ and carbon can be added. For example, high-reliability inks can be prepared by adding additives such as dispersants.

The substrate 110 on which the coloring layer 130 is formed may be wound around an output side roll (not shown).

[Cutting process (540)]

The output side rollers may be accommodated for the cutting process 540 . The substrate 110 on which the coloring layer 130 forming process 520 has been performed may be wound around output-side rolls. In this case, the output side rollers may be input side rollers.

The substrate 110 released from the input roller and moved in one direction may be cut into unit cells by using a cutting device (not shown). The size of the unit cell may be determined in consideration of the size of the electronic device to be mounted.

Therefore, in one embodiment, each of the processes S510 to S540 may be performed by a roll-to-roll process. Accordingly, mass productivity is improved, enabling mass production, and process efficiency is optimized to reduce process cost and production cost.

On the other hand, allowing and not allowing the use of target colors will be described with reference to FIGS. 16 to 18 .

Figure 16 is an embodiment of colors according to wavelength, brightness and saturation.

FIG. 16 is based on the colored lights shown in FIG. 4 .

The realization of the target color can be related to the wavelength of the visible light band, and the reflectance can be related to the brightness and saturation of the target color.

As shown in Figure 16a, in a downwardly shifted reflectance curve relative to the central reflectance curve, brightness and saturation may decrease, and in an upwardly shifted reflectance curve relative to the central reflectance curve, brightness and saturation may decrease. Saturation can be increased.

As shown in Figure 16b, if the reflectance curve is outside the dominant wavelength range of the target color, it is not allowed. However, colors other than the target color may be realized if the reflectance curve is outside the dominant wavelength range of the target color.

If various color realizations are allowed, the reflectance curve can extend beyond the dominant wavelength range as well as the dominant wavelength range of the target color.

Fig. 17 shows a permissible example of the target color.

FIG. 17 is based on the colored light shown in FIG. 4 .

Since the part of Fig. 17a is the same as that already described in Fig. 16a, further description is omitted.

As shown in FIG. 17b, if the start points of the peaks in the dominant wavelength range are the same and the main peak is within the dominant wavelength range, since there is no obstacle to achieving the target color, variations in reflectance within the dominant wavelength range can be tolerated.

As shown in FIG. 17c, when the end points of the peaks in the dominant wavelength range are the same, variations in reflectance can be tolerated because there is no obstacle to achieving the target color.

In FIG. 17 , ① to ⑥ may mean reflectance curves.

Fig. 18 shows an example where target colors are not allowed.

FIG. 18 is based on the colored light shown in FIG. 12 .

As shown in FIG. 18 , when the amplitude of the peak changes or the peak reflectance of the reflectance curve (①,②) moves toward decreasing or increasing wavelength, the target color may not be allowed because it is not realized. Nevertheless, a change in the amplitude of the peak or a shift of the peak reflectivity of the reflectance curves (①,②) towards decreasing or increasing wavelengths is acceptable if the realization of colors other than the target color is also acceptable.

The foregoing detailed description should not be construed as limiting in all respects, but as illustrative. The scope of the embodiments should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the embodiments are included in the scope of the embodiments.

Industrial Applicability

Embodiments are color-variable structures providing light of at least two or more colors, and may be applied to electronic devices. For example, embodiments may be employed in mobile devices as well as consumer electronics, automotive interior and exterior materials, and architectural interior and exterior materials.

Claims (21)

1. A variable color structure, the variable color structure comprising:

a substrate;

a color modulation layer comprising five or less films disposed on the substrate to provide at least two or more colored lights; and

a colored layer on the color modulation layer.

2. The variable color structure of claim 1, wherein the color modulation layer comprises a thin film for generating gray or silver light according to a viewing angle,

wherein the film comprises TiO ₂ And Nb (Nb) ₂ O ₅ And (2) and

wherein the thickness of the film is 50 nm to 70 nm.

3. The variable color structure according to claim 2, wherein the color modulation layer has a peak reflectance in a wavelength range of 450 nm to 480 nm among wavelength ranges corresponding to visible light, and the reflectance decreases with the decrease in wavelength or the increase in wavelength according to the peak reflectance, and

wherein the wavelength range corresponding to the visible light is 380 nm to 750 nm.

4. The variable color structure according to claim 1, wherein the color modulation layer comprises a thin film for generating cyan light or gold light according to a viewing angle,

Wherein the film comprises TiO ₂ And Nb (Nb) ₂ O ₅ And (2) and

wherein the thickness of the film is 70 nm to 100 nm.

5. The variable color structure according to claim 4, wherein the color modulation layer has a valley reflectance in a wavelength range of 420 nm to 450 nm among wavelength ranges corresponding to visible light, and the reflectance increases as the wavelength decreases or as the wavelength increases according to the valley reflectance, and

wherein the wavelength range corresponding to the visible light is 380 nm to 750 nm.

6. The variable color structure of claim 1, wherein the color modulation layer comprises a first film, a second film, and a third film for generating violet light or yellow light according to a viewing angle,

the first thin film is disposed on the substrate and has a thickness of 5 nm to 25 nm,

the second thin film is disposed on the first thin film and has a thickness of 80 nm to 100 nm,

the third film is provided on the second film and has a thickness of 5 nm to 25 nm, and

the first film and the third film comprise the same material.

7. The variable color structure according to claim 6, wherein the color modulation layer has a valley reflectance in a wavelength range of 600 nm to 750 nm among wavelength ranges corresponding to visible light, and the reflectance increases as the wavelength decreases according to the valley reflectance, and

Wherein the wavelength range corresponding to the visible light is 380 nm to 750 nm.

8. The variable color structure of claim 7, wherein the valley reflectivity remains constant over a wavelength range of 600 nanometers to 750 nanometers.

9. The variable color structure of claim 6, wherein the first and third films comprise Nb ₂ O ₅ And (2) and

the second film comprises SiO ₂ 。

10. The variable color structure of claim 1, wherein the color modulation layer comprises a first film, a second film, and a third film for generating a pink, orange, or red light according to a viewing angle,

the first thin film is disposed on the substrate and has a thickness of 35 nm to 55 nm,

the second film is disposed on the first film and has a thickness of 200 nm to 250 nm,

the third film is disposed on the second film and has a thickness of 35 nm to 55 nm, and

the first film and the third film comprise the same material.

11. The variable color structure of claim 10, wherein the color modulation layer has a first valley reflectance in a wavelength range of 410 nm to 460 nm, a peak reflectance in a wavelength range of 480 nm to 520 nm, and a second valley reflectance in a wavelength range of 650 nm to 680 nm among wavelength ranges corresponding to visible light, and

Wherein the wavelength range corresponding to the visible light is 380 nm to 750 nm.

12. The variable color structure of claim 11, wherein the color modulation layer has a first peak transmittance in a wavelength range of 410 nm to 460 nm and a valley transmittance in a wavelength range of 480 nm to 520 nm among wavelength ranges corresponding to visible light, and has a second peak transmittance in a wavelength range of 650 nm to 680 nm, and

wherein the wavelength range corresponding to the visible light is 380 nm to 750 nm.

13. The variable color structure of claim 10, wherein the first and third films comprise Nb ₂ O ₅ And (2) and

the second film comprises SiO ₂ 。

14. The variable color structure of claim 1, wherein the color modulation layer comprises first, second, and third films for generating yellow, green, or blue light according to a viewing angle,

the first thin film is disposed on the substrate and has a thickness of 35 nm to 55 nm,

the second thin film is disposed on the first thin film and has a thickness of 240 nm to 270 nm,

The third film is disposed on the second film and has a thickness of 55 nm to 75 nm,

the first film and the third film comprise the same material.

15. The variable color structure of claim 14, wherein the color modulation layer has a peak reflectance in a wavelength range of 420 nm to 450 nm and a valley reflectance in a wavelength range of 570nm to 610nm among wavelength ranges corresponding to visible light, and

wherein the wavelength range corresponding to the visible light is 380 nm to 750 nm.

16. The variable color structure of claim 15, wherein the color modulation layer has a valley transmittance in a wavelength range of 420 nm to 450 nm among wavelength ranges corresponding to visible light, and has a peak transmittance in the wavelength range of 570nm to 610nm, and

wherein the wavelength range corresponding to the visible light is 380 nm to 750 nm.

17. The variable color structure of claim 14, wherein the first and third films comprise Nb ₂ O ₅ And (2) and

the second film comprises SiO ₂ 。

18. The variable color structure according to claim 1, wherein among the five or less films, a lowermost film and an uppermost film are adhesive members, and the remaining films are refractive members.

19. The variable color structure of claim 1, wherein the five or less films are refractive members.

20. The variable color structure of claim 1, further comprising:

and a pattern layer disposed on at least one surface of the substrate.

21. An electronic device, the electronic device comprising:

a main body; and

the variable color structure of claims 1-23, disposed on at least one side of the body.

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