Active functional decorative film

Abstract

The present invention relates to an active functional decorative film. The active functional decorative film comprises: a driving layer including charged particles dispersed in a fluid; a first electrode layer and a second electrode layer positioned on the upper surface and the lower surface of the driving layer; and a light collection layer which is positioned on one of the upper surface of the first electrode layer and the lower surface of the second electrode layer, and which includes light collection particles for reflecting or transmitting specific light.

Description

Active functional decorative film

[0001] The present invention relates to an active functional decorative film, and more particularly, to an active functional decorative film in which reflected light or a reflection pattern changes when an electric field is applied.

[0002] In recent years, the need for improved aesthetics in the appearance of electronic and home appliance products has been increasing. For this reason, special decorative films are being applied to electronic and home appliance products to achieve diverse appearances. However, conventional decorative films have been limited to a fixed color and design.

[0003] For this reason, the development and commercialization of color-variable film technology that changes color according to external stimuli is in progress, but conventional films display only the color combinations of the moved color particles by moving the color particles with electricity, so there are limitations in changing the color sensation, such as brightness, in various ways.

[0004] The present invention aims to address various issues, including those described above, by providing an active functional decorative film capable of controlling the color, luster, or pattern reflected from a surface by applying an electric field. However, these tasks are exemplary and are not intended to limit the scope of the present invention.

[0005] An active functional decorative film according to the present invention for solving the above problem may include a driving layer including charged particles dispersed in a fluid; a first electrode layer and a second electrode layer positioned on an upper surface and a lower surface of the driving layer; and a light layer positioned on one of the upper surface of the first electrode layer and the lower surface of the second electrode layer and including light particles that reflect or transmit specific light.

[0006] Additionally, according to the present invention, the driving layer may include charged heterogeneous charged particles having different colors and polarities.

[0007] Additionally, according to the present invention, the charged particles in the driving layer can be encapsulated in a form dispersed within the fluid.

[0008] In addition, according to the present invention, the color difference before and after driving of the driving layer can be varied by 10 or more by a voltage applied between the first electrode layer and the second electrode layer.

[0009] In addition, according to the present invention, the difference in visible light transmittance between the driving layer before and after driving can be varied to 30 or more by a voltage applied between the first electrode layer and the second electrode layer.

[0010] In addition, according to the present invention, one of the first electrode layer and the second electrode layer is formed as an electrode pattern, and by a voltage applied between the first electrode layer and the second electrode layer, the charged particles are aggregated on the electrode pattern, so that the transmittance of the driving layer can be controlled.

[0011] In addition, according to the present invention, the driving layer can be driven by any one of a polymer dispersed liquid crystal (PDLC) method, an electrochromic (EC) method, a suspended particle display (SPD) method, and an electrophoretic method.

[0012] Additionally, according to the present invention, the thickness of the luminous layer may be 2 um to 30 um.

[0013] Additionally, according to the present invention, the light layer may have a transmittance of light in the visible light wavelength band of 50% or more.

[0014] Additionally, according to the present invention, the photoluminescent layer can block ultraviolet (UV) rays.

[0015] In addition, according to the present invention, the luminous layer is divided into a plurality of regions having different luminosities, and each region having different luminosities can be driven by a segment or a thin film transistor (TFT) formed in either the first electrode layer or the second electrode layer.

[0016] In addition, according to the present invention, at least a portion of the gloss layer may have a rough structure, or a predetermined pattern may be formed on the surface of the gloss layer or a predetermined texture may be expressed.

[0017] Additionally, according to the present invention, the optical layer may include a QR code, a bar code, or a logo.

[0018] Additionally, according to the present invention, the luminous layer may include metal particles, mica particles, or particles exhibiting a holographic effect.

[0019] Additionally, according to the present invention, the luminous layer can be formed by mixing the luminous particles and a color masterbatch.

[0020] Additionally, according to the present invention, the luminous particles may be included in the luminous layer at a concentration of 1% or more and 7% or less by weight.

[0021] An active functional decorative film according to the invention for solving the above problem comprises: a driving layer including charged particles dispersed in a fluid; and a first electrode layer and a second electrode layer positioned on an upper surface and a lower surface of the driving layer; wherein the driving layer further includes charged photoluminescent particles that reflect or transmit specific light, and the photoluminescent particles can be charged with a polarity different from that of the charged particles.

[0022] In addition, according to the present invention, the slope of the photoluminescent particles can be varied by a voltage applied between the first electrode layer and the second electrode layer.

[0023] In addition, according to the present invention, the photoluminescent particles may be repeatedly arranged in a layered structure of two or more layers of materials having different refractive indices.

[0024] In addition, according to the present invention, the light particles are plate-shaped with a width of 3 um to 40 um, and are made of AlF3, MgF2, CaF2, SiO2, TiO x It may contain any one of the following substances.

[0025] Additionally, according to the present invention, the fluid may have a different color than the charged particles.

[0026] According to various embodiments of the present invention, as described above, the color, luster, or pattern reflected from a surface can be easily and diversely controlled by electrical actuation. Of course, the scope of the present invention is not limited by these effects.

[0027] FIG. 1 is a cross-sectional view of an example of an active functional decorative film according to an embodiment of the present invention.

[0028] FIG. 2 is a cross-sectional view of another example of an active functional decorative film according to an embodiment of the present invention.

[0029] FIG. 3 is a drawing showing a plan view of the active functional decorative film illustrated in FIGS. 1 and 2.

[0030] FIG. 4 is a cross-sectional view of another example of an active functional decorative film according to an embodiment of the present invention.

[0031] Figure 5 is a drawing showing a plan view of the active functional decorative film illustrated in Figure 4.

[0032] FIG. 6 is a cross-sectional view of another example of an active functional decorative film according to an embodiment of the present invention.

[0033] Fig. 7 is a drawing showing a plan view of the active functional decorative film illustrated in Fig. 6.

[0034] FIGS. 8 to 11 are drawings showing examples of implementation of an active functional decorative film according to an embodiment of the present invention.

[0035] <Explanation of symbols>

[0036] 110: First substrate

[0037] 120: First electrode layer

[0038] 130: Drive layer

[0039] 138: Bulkhead

[0040] 140: Second electrode layer

[0041] 150: Second substrate

[0042] 160: Radiant layer

[0043] 100, 200, 400, 600: Active functional decorative film

[0044] Hereinafter, various preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0045] The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The following embodiments may be modified in various ways, and the scope of the present invention is not limited to the following embodiments. Rather, these embodiments are provided to more faithfully and completely explain the present disclosure and to fully convey the spirit of the present invention to those skilled in the art. In addition, the thickness and size of each layer in the drawings are exaggerated for convenience and clarity of explanation.

[0046] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting of the present invention. As used herein, the singular forms "a," "an," and "the" include the plural forms unless the context clearly dictates otherwise. Furthermore, when used herein, the words "comprise" and / or "comprising" specify the presence of stated features, numbers, steps, operations, parts, elements, and / or groups thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, parts, elements, and / or groups thereof.

[0047] Hereinafter, embodiments of the present invention will be described with reference to drawings schematically illustrating ideal embodiments of the present invention. In the drawings, variations in the shapes depicted may be expected, for example, depending on manufacturing techniques and / or tolerances. Therefore, embodiments of the present invention should not be construed as limited to the specific shapes of the regions depicted herein, but should include, for example, variations in shapes resulting from manufacturing processes.

[0048] FIG. 1 is a drawing showing a cross-section of an example of an active functional decorative film according to an embodiment of the present invention, FIG. 2 is a drawing showing a cross-section of another example of an active functional decorative film according to an embodiment of the present invention, and FIG. 3 is a drawing showing a plan view of the active functional decorative film shown in FIGS. 1 and 2.

[0049] Referring to FIG. 1, an active functional decorative film (100) according to an embodiment of the present invention includes a first substrate (110), a first electrode layer (120), a driving layer (130), a second electrode layer (140), a second substrate (150), and a light layer (160). The first substrate (110) and the second substrate (150) may be made of various types of film, paper, plastic, etc., and are not limited to a specific type. In the drawing, the first substrate (110) and the second substrate (150) are shown as being formed simultaneously on the upper and lower portions of the driving layer (130), but in some cases, the substrates on the upper and lower portions of the driving layer (130) may be omitted.

[0050] The first electrode layer (120) and the second electrode layer (140) may be implemented in a flat form, or some of the electrode layers may be implemented in a specific pattern as illustrated in FIG. 2. The first electrode layer (120) and the second electrode layer (140) may include a color implemented as a transparent electrode. The first electrode layer (120) and the second electrode layer (140) may be formed of, for example, a metal or a transparent conductive oxide such as ITO. The first electrode layer (120) and the second electrode layer (140) are not limited to the term and may be implemented of a transparent conductive material as well as a translucent conductive material.

[0051] The driving layer (130) is located between the first electrode layer (120) and the second electrode layer (140). The driving layer (130) includes charged particles (132, 134) capable of electrophoresis, and the charged particles (132, 134) may exist in a dispersed form within a fluid (136). When an electric field is applied, the charged particles (132, 134) move to a specific position within the fluid (136). For example, the charged particles (132, 134) may be particles exhibiting bi-stability that maintain their current positions even after the electric field disappears. The charged particles (132, 134) may be moved to a desired position within the driving layer (130) by controlling the on / off operation of a switch (not shown) for applying voltage to the first electrode layer (120) and the second electrode layer (140) or by pulse control. The color displayed by the driving layer may vary depending on the position of the charged particles (132, 134).

[0052] By the voltage applied to the first electrode layer (120) and the second electrode layer (140), the color difference (△E) of the driving layer (130) before and after electric driving can be varied to 10 or more. The color difference (△E) refers to the difference between the color of the driving layer (130) before voltage driving and the color of the driving layer (130) after voltage driving. The formula for calculating the color difference (△E) is as shown in the following formula 1, and the larger the color difference value, the more the color has changed. Since the contrast effect by the color difference of the driving layer (130) is greater when it is greater, the minimum color difference (△E) controlled in the driving layer (130) must satisfy 10 or more.

[0053] [Formula 1]

[0054]

[0055] Here, L2 * - L1 * refers to the difference in brightness before and after driving of the driving layer (130), and a2 * - a1 * silver It refers to the difference in red and green color before and after driving of the driving layer (130), b2 * - b1 * refers to the difference in yellow-blue color before and after driving of the driving layer (130). After calculating the difference for each item, the color difference (△E) is calculated as the root value. * ab ) can be obtained.

[0056] The charged particles (132, 134) can be moved to a desired position within the driving layer (130) by controlling the on / off operation of a switch (not shown) for applying voltage to the first electrode layer (120) and the second electrode layer (140) or by pulse control. The color displayed by the driving layer (130) can vary depending on the position of the charged particles (132, 134).

[0057] For example, the driving layer (130) may include first charged particles (132) having a first color and second charged particles (134) having a second color. The first charged particles (132) and the second charged particles (134) are particles charged with different polarities. For example, the first charged particles (132) may exhibit a positive (+) polarity, and the second charged particles (134) may exhibit a negative (-) polarity. The colors of the first charged particles (132) and the second charged particles (134) may be different colors. The first color may be black, and the second color may be white. The black first charged particles (132) may include carbon, and the white second charged particles (134) may include TiO. x may include. Alternatively, at least one of the first color and the second color may be a chromatic color rather than an achromatic color.

[0058] The driving layer (130) exhibits two colors (e.g., black and white) by the movement of the charged particles (132, 134) described above. Various colors or glitter effects can be exhibited by only changing the glitter layer (160) without changing the driving layer (130). For example, various optical effects such as colors or glitter can be exhibited by patterning and laminating at least one type of glitter layer (160) on a large area of ​​film including the driving layer (130), the first electrode layer (120), and the second electrode layer (140).

[0059] By the voltage applied to the first electrode layer (120) and the second electrode layer (140), the difference in visible light transmittance (△T) of the driving layer (130) before and after driving can be varied to 30 or more. The difference in transmittance (△T) refers to the difference between the transmittance of the driving layer (130) before voltage driving and the transmittance of the driving layer (130) after voltage driving. The larger the difference in transmittance, the greater the change in transmittance. Since the contrast effect is greater when the difference in transmittance of the driving layer (130) is large, the minimum transmittance (△T) controlled in the driving layer (130) must satisfy 10 or more.

[0060] The radiant layer (160) is positioned on the second substrate (150) and selectively reflects light of a specific wavelength band or selectively transmits light of a specific wavelength band. The radiant layer (160) may have radiant particles (162) arranged regularly or irregularly, which reflect a portion of the incident light and transmit the remainder. The shape of the radiant particles (162) may be variously modified, such as circular or plate-shaped, depending on the embodiment. In addition, the surface of the radiant particles (162) may be surface-treated to achieve various optical effects.

[0061] The luminous layer (160) may be formed with a thickness of 2 μm to 30 μm. If the thickness of the luminous layer (160) is less than 2 μm, there is a problem in that it is difficult to obtain a luminous effect. If the thickness of the luminous layer (160) exceeds 30 μm, the luminous effect is enhanced, but if the thickness of the luminous layer (160) becomes too thick, the weight increases as the luminous particles (162) increase, which causes a problem in that there is a limit to the electrophoretic operation. In addition, if the thickness of the luminous layer (160) becomes too thick, the transmittance also decreases, and there is a problem in that an appropriate color contrast effect is not exhibited.

[0062] The luminous layer (160) can be divided into multiple regions having different luminosities. In order to independently drive each of the multiple regions, either the first electrode layer (120) or the second electrode layer (140) can be formed with an electrode pattern for segment driving or thin film transistor (TFT) driving.

[0063] Additionally, at least a portion of the opaque layer (160) may be processed into a rough structure. Furthermore, a three-dimensional stereoscopic image may be recorded on the opaque layer (160). Alternatively, the opaque layer (160) may be in the shape of a QR code, barcode, or logo. Alternatively, the opaque layer (160) may include a glass material.

[0064] As another example, a texture may be formed using a mold engraved with a specific pattern or texture on the surface of the radiant layer (160). Alternatively, particles exhibiting a specific optical effect may be added to the radiant layer (160). For example, the particles may include metallic particles, mica particles exhibiting a pearlescent pattern, particles exhibiting a holographic effect, etc., to exhibit various effects based on reflection and refraction.

[0065] The luminous particles (162) may be included in the luminous layer (160) at a concentration of 1% or more and 7% or less by weight. If the luminous particles (162) are included in the luminous layer (160) at a concentration of less than 1% by weight, the content of the luminous particles (162) becomes low, and thus the luminous effect cannot be obtained. On the other hand, if the luminous particles (162) are included in the luminous layer (160) at a concentration exceeding 7% by weight, the content of the luminous particles (162) in the luminous layer (160) increases and the transmittance decreases, which causes a problem in that the visibility of the color change of the driving layer (130) decreases.

[0066] The luminous particles (162) may include a pigment. Unlike dyes, pigments are substances that do not dissolve in a solution. The pigment may be a laminated structure in which particles with different refractive indices are repeatedly arranged in a layered structure of at least two layers. For example, the luminous particles (162) may be implemented as an optically variable pigment (OVP) whose luminosity changes depending on the viewing angle. As another example, the luminous particles (162) may be AlF3, MgF2, CaF2, SiO2, TiO x may contain at least one substance.

[0067] The luminous particles (162) may include plate-shaped pigments having a width of 3 μm to 40 μm. Here, the width refers to the diameter of the longest region of the particles. If the width of the luminous particles (162) is less than 3 μm, there is a problem that the diameter becomes too small, making it difficult to obtain a luminous effect. If the width of the luminous particles (162) exceeds 40 μm, the size of the particles becomes too large, making it difficult to manufacture the luminous layer (160). For example, considering the thickness and area of ​​the luminous layer (160), it is difficult to place a large number of luminous particles (162) inside a film or a microcapsule with a diameter of less than 30 μm, so the width of the luminous particles (162) must be controlled to have an appropriate diameter.

[0068] The luminous particles (162) may be fixed by a material (164) forming a luminous layer (160). The luminous layer (160) has a property of blocking ultraviolet (UV) rays, and the material (164) forming the luminous layer (160) may be, for example, a material having a light transmittance of 50% or more in the visible light wavelength band, and may include a curing agent or a synthetic resin. If the transmittance of the material (164) is less than 50%, there may be a problem that the color or luminous effect of the active functional decorative film (100) is not clear, and therefore, the transmittance of the material (164) should be at least 50% or more. Preferably, the transmittance of the material (164) should be 75% or more.

[0069] As another embodiment, the driving layer (130) can be implemented by manufacturing a capsule containing a fluid (136) containing electrophoretic charged particles (132, 134) with a transparent material and then coating the capsule. The fluid (136) is a polar or non-polar solvent and can be transparent or have a color similar to or contrasting with the charged particles (132, 134).

[0070] In order to secure space in the driving layer (130), a plurality of partition walls (138) may be present between the first electrode layer (120) and the second electrode layer (140). The partition walls (138) may be arranged regularly or irregularly.

[0071] The above-described active functional decorative film (100) can be manufactured by forming a first electrode layer (120) and a second electrode layer (140) on the upper and lower portions of the driving layer (130) after forming the driving layer (130). When substrates (110, 150) are applied, the first substrate (110) and the second substrate (150) can be formed on one surface of the first electrode layer (120) and the second electrode layer (140). Thereafter, a light layer (160) can be formed on the second electrode layer (140) or the second substrate (150). In addition, the order and method of forming the substrates (110, 150), the electrode layers (120, 140), and the driving layer (130) can be implemented by various embodiments.

[0072] Meanwhile, the luminous layer (160) can be formed as a layer representing color using a color masterbatch. For example, a luminous layer (160) of a certain thickness can be formed by mixing luminous particles (162) and a color masterbatch. The luminous particles (162) can be evenly added to the entire luminous layer (160) using the color masterbatch.

[0073] In another embodiment, the luminous layer (160) may be formed of multiple layers having different colors. Although the active functional decorative film (100) illustrated in FIG. 1 illustrates one luminous layer (160), multiple luminous layers (160) may overlap each other. The luminous particles (162) present in each of the multiple luminous layers (160) may be the same or may be composed of different luminous particles (162). In addition, the materials constituting the multiple luminous layers (162) may be controlled to exhibit different colors.

[0074] Referring to FIG. 2, an active functional decorative film (200) according to an embodiment of the present invention includes a first substrate (210), a first electrode layer (220), a driving layer (230), a second electrode layer (240), a second substrate (250), and a light layer (260).

[0075] The driving layer (230) may be driven by any one of, for example, a polymer dispersed liquid crystal (PDLC) method, an electrochromic (EC) method, and a suspended particle display (SPD) method. Since the above methods are already known, a detailed description thereof will be omitted.

[0076] The charged particles (232) can be dispersed within the driving layer (230) or moved to the second electrode layer (240) by controlling the on / off operation of a switch (not shown) for applying voltage to the first electrode layer (220) and the second electrode layer (240) or by pulse control. The transmittance of the driving layer (230) can be changed depending on the position of the charged particles (232).

[0077] By the voltage applied to the first electrode layer (220) and the second electrode layer (240), the visible light transmittance difference (△T) of the driving layer (230) before and after driving can be varied to 30 or more. The transmittance difference (△T) refers to the difference between the transmittance of the driving layer (230) before voltage driving and the transmittance of the driving layer (230) after voltage driving. The larger this transmittance difference is, the greater the change in transmittance is. Since the contrast effect is greater when the transmittance difference of the driving layer (230) is large, the minimum transmittance (△T) controlled in the driving layer (230) must satisfy 10 or more.

[0078] The first electrode layer (220) and the second electrode layer (240) are generally implemented in a planar form. For example, in order to further improve the transmittance, the first electrode layer (220) may be implemented in a specific pattern. In this case, the charged particles (232) may only use one particle having the first color. Depending on whether an electric field is formed, as illustrated in FIG. 2, the charged particles (232) may move away from the second electrode layer (240) or may be formed in agglomeration near the area where the second electrode layer (240) is arranged.

[0079] Referring to FIG. 3, the active functional decorative film (100, 200) illustrated in FIGS. 1 and 2 changes the background color of the luminous layer (160, 260) in the same manner as the driving layer (310, 360) illustrated in FIG. 3 according to the application of an electric field. For example, in the active functional decorative film (100) of FIG. 1, the first charged particle (132) may be a black particle, and the second charged particle (134) may be a white particle. At this time, when electricity is applied, the first charged particle (132) and the second charged particle (134) move in different directions. For example, when a positive (+) voltage is applied to the second electrode layer (140) and a negative (-) voltage is applied to the first electrode layer (120), the first charged particles (132) move toward the second electrode layer (140) and the second charged particles (134) move toward the first electrode layer (120), so that the driving layer (130) can exhibit a black color. Conversely, when a negative (-) voltage is applied to the second electrode layer (140) and a positive (+) voltage is applied to the first electrode layer (120), the second charged particles (134) move toward the second electrode layer (140) and the first charged particles (132) move toward the first electrode layer (120), so that the driving layer (130) can exhibit a white color. Accordingly, the background color (310, 360) of the radiant layer (300, 350) can be a black active functional deco film (300) and a white active functional deco film (350).

[0080] Some of the incident light on the radiant layer (160) is reflected by the radiant particles (162) present in the radiant layer (160), and the remainder passes through the radiant layer (160) and then reaches the driving layer (130, 230). In one embodiment, the radiant layer (160) may be implemented so that more than 70% of the incident light (particularly, visible light) is transmitted. Depending on the color of the driving layer (130), the optical characteristics such as the color and wavelength of the light reflected from the radiant layer (160) change. The color of the active functional decorative film (100) visible to the user's eyes (i.e., the color appearing in the radiant particles (320, 370)) appears as a mixture of the first reflected light reflected from the radiant layer (160) and the second reflected light reflected from the surface of the driving layer (130). Since the second reflected light reflected from the surface of the driving layer (130) varies depending on the color of the driving layer (130), the background color of the active functional decorative film (100) can be changed by applying an electric field to change the color (i.e., background color) of the driving layer (130). For example, if the background color is black, only a specific wavelength of light transmitted through the radiant layer (160) is reflected by the driving layer (130), so that the radiant particles (320) appear to have a specific color. On the other hand, if the background color is white, most of the light transmitted through the radiant particles (370) is reflected by the driving layer (130), so that the radiant particles (370) appear almost colorless.

[0081] FIG. 4 is a cross-sectional view of another example of an active functional decorative film according to an embodiment of the present invention, and FIG. 5 is a plan view of the active functional decorative film illustrated in FIG. 4.

[0082] Referring to FIG. 4, an active functional decorative film (400) according to an embodiment of the present invention includes a first substrate (410), a first electrode layer (420), a driving layer (430), a second electrode layer (440), and a second substrate (450). Hereinafter, a description of the same configuration as described above with reference to FIGS. 1 and 2 is omitted.

[0083] The driving layer (430) includes charged particles (432, 462) dispersed within a fluid (436). For example, the charged particles (432, 462) include luminous particles (462) that selectively reflect or transmit light of a specific wavelength band, and black particles (432) that are charged with a charge opposite to the charge charged on the surface of the luminous particles (462).

[0084] The luminous particles (462) and black particles (432) having surfaces charged with different polarities exist in a dispersed form within the fluid (436). The luminous particles (462) may be the same as the luminous particles (162) constituting the luminous layer (160) illustrated in FIG. 1. When voltage is applied to the first electrode layer (420) and the second electrode layer (440), the luminous particles (462) and black particles (432) dispersed within the fluid (436) move to different electrode layers, respectively. For example, the black particles (432) may exhibit a positive (+) polarity, and the luminous particles (462) may exhibit a negative (-) polarity.

[0085] Referring to FIG. 5, when a positive (+) voltage is applied to the second electrode layer (440) and a negative (-) voltage is applied to the first electrode layer (420), the luminous particles (462) move toward the second electrode layer (440) and the black particles (432) move toward the first electrode layer (420), so that the driving layer (430) can exhibit a luminous effect that contrasts with the color of the driving layer (430) (i.e., the background color) by reflecting some of the incident light by the luminous particles (462). Conversely, when a negative (-) voltage is applied to the second electrode layer (440) and a positive (+) voltage is applied to the first electrode layer (420), the luminous particles (462) move toward the first electrode layer (420) and the black particles (432) move toward the second electrode layer (440), so that the color (i.e., background color) of the driving layer (430) appears black due to the black particles (432). Therefore, an active functional decorative film (500) in which the background color (510) of the driving layer (430) is black and a luminous effect is exhibited by the luminous particles (520) and an active functional decorative film (550) in which the background color (510) appears black can be obtained.

[0086] FIG. 6 is a cross-sectional view of another example of an active functional decorative film according to an embodiment of the present invention, and FIG. 7 is a plan view of the active functional decorative film illustrated in FIG. 6.

[0087] Referring to FIG. 6, an active functional decorative film (600) according to an embodiment of the present invention includes a first substrate (610), a first electrode layer (620), a driving layer (630), a second electrode layer (640), and a second substrate (650). Hereinafter, a description of the same configuration as described above with reference to FIGS. 1 to 3 is omitted.

[0088] The driving layer (630) includes charged particles (662) dispersed within the fluid (636). For example, the charged particles (662) include luminescent particles (662) that selectively reflect or transmit light of a specific wavelength band.

[0089] When an electric field is applied, the charged particles (662) move and / or rotate within the fluid (636). An electric field can be formed in the driving layer (630) by applying a voltage to the first electrode layer (620) and the second electrode layer (640). Depending on the strength of the applied voltage, the moving speed and / or moving position of the charged particles (662) can be controlled. The rotation angle of the charged particles (662) can be controlled via a pulse signal. Since the charged particles (662) are thin plate-shaped, various effects such as transmittance and reflection and sparkling effects on the surface can be exhibited depending on the moving position and / or rotation angle of the charged particles (662).

[0090] The luminous particles (662) may be the same as the luminous particles (162) constituting the luminous layer (160) illustrated in FIG. 1. When voltage is applied to the first electrode layer (620) and the second electrode layer (640), the luminous particles (662) dispersed within the fluid (636) may have their inclination varied at a predetermined angle different from the initial arrangement within the fluid (636). For example, when no voltage is applied to the first electrode layer (620) and the second electrode layer (640), the luminous particles (662) may be arranged in a horizontally laminated form on the electrode layers (620, 640), as shown on the left side of the active functional decorative film (600) illustrated in FIG. 6. When voltage is applied to the first electrode layer (620) and the second electrode layer (640), the luminous particles (662) can be arranged in a stacked form perpendicular to the electrode layers (620, 640), as shown on the right side of the active functional decorative film (600) illustrated in FIG. 6.

[0091] Referring to FIG. 7, when no voltage is applied to the first electrode layer (420) and the second electrode layer (440), the luminous particles (462) are arranged in a horizontal form to the first electrode layer (420) and the second electrode layer (440), and the driving layer (630) may exhibit a luminous effect contrasting with the color of the driving layer (630) (i.e., the background color) by reflecting some of the incident light by the luminous particles (462). When a negative (-) voltage is applied to the second electrode layer (640) and a positive (+) voltage is applied to the first electrode layer (620), the luminous particles (662) may have a variable inclination at a predetermined angle, and are arranged, for example, in a vertical form to the first electrode layer (420) and the second electrode layer (440). In this case, the color of the driving layer (630) (i.e., the background color) appears white in the area where the luminous particles (662) are arranged in contrast to the color of the fluid (636). Therefore, the active functional decorative film (700) in which the background color (710) of the driving layer (630) is black and a luminous effect is exhibited by the luminous particles (720) and the active functional decorative film (750) in which the background color (710) is black and the luminous particles (770) appear white can be used.

[0092] Hereinafter, in order to confirm the luster characteristics of the active functional decorative film of the present invention, films having various luster layers containing luster particles were manufactured, and then the surface colors were compared as shown in FIGS. 8 to 11. FIGS. 8 to 11 are drawings illustrating examples of implementations of active functional decorative films according to embodiments of the present invention.

[0093] First, referring to Fig. 8, it was confirmed that the colors displayed on the same luminous layer differ when the luminous layer has a black background (800) and when the luminous layer has a white background (810). When the background is black (800), the various colors of the luminous layer are clearly displayed, but when the background is white (810), the colors of the luminous layer appear almost identically white and there is no significant difference in color.

[0094] Referring to Fig. 9, it was confirmed that the colors displayed on the same radiant layer differ when the driving layer located on the lower surface of the radiant layer has a black background (900) and a white background (910), as in Fig. 8. When the background is black (900), the various colors of the radiant layer are clearly displayed, but when the background is white (910), the saturation of the colors of the radiant layer is different, but the radiant effect by the radiant layer is the same.

[0095] Referring to Fig. 10, film photographs of experimental examples for determining the luminous effect according to the thickness of the luminous layer are provided. In order to more clearly confirm the luminous effect according to the thickness of the luminous layer, the transmittance and color contrast results were measured and summarized in Table 1 below. Hereinafter, the concentration of the solution refers to the ratio of the content of luminous particles included in the solution manufactured for manufacturing the luminous layer. The color contrast is expressed as O when the color difference between two colors is 10 or more, and X when it is less than 10. Here, the two colors refer to the colors before and after voltage application in the configuration of the present invention.

[0096] Sample photoluminescent layer solution concentration (%) Film thickness (㎛) Transmittance (%) Color contrast Experimental example 1 (Fig. 10 (a)) Not applied --- Experimental example 2 (Fig. 10 (b)) Applied 41580.02O Experimental example 3 (Fig. 10 (c)) Applied 42570.12O Experimental example 4 (Fig. 10 (d)) Applied 43558.23X

[0097] Referring to Table 1 above, among the samples with a thickness of the gloss layer applied, in the case of Experimental Examples 2 and 3 having a thickness of 15㎛ and 25㎛, it was confirmed that the transmittance of the gloss layer was excellent at over 70% and the color difference between the two colors was excellent at over 10 compared to Experimental Example 1 without the gloss layer applied. On the other hand, in Experimental Example 4 with a thick gloss layer applied at 35㎛, the transmittance was measured to be low at less than 70%, and the color contrast effect could not be obtained.

[0098] Referring to Fig. 11, film photographs are provided for experimental examples to determine the luminous effect according to the different control of the concentration of the solution of the luminous layer while the thickness of the luminous layer is constant. In order to more clearly confirm the luminous effect according to the concentration of the solution of the luminous layer, the transmittance and color contrast results were measured and summarized in Table 2 below. Hereinafter, the concentration of the solution means the ratio of the content of luminous particles included in the solution manufactured for manufacturing the luminous layer. The color contrast is expressed as O when the color difference between two colors is 10 or more, and X when it is less than 10. Here, the two colors mean the colors before and after voltage is applied in the configuration of the present invention.

[0099] Sample photoluminescent layer solution concentration (%) Film thickness (㎛) Transmittance (%) Color contrast Experimental example 1 (Fig. 11 (a)) Not applied---Experimental example 5 (Fig. 11 (b)) Applied 4 1578.57 O Experimental example 6 (Fig. 11 (c)) Applied 7 1570.58 O Experimental example 7 (Fig. 11 (d)) Applied 10 1561.35 X

[0100] Referring to Table 2 above, in the case of Experimental Examples 5 and 6, where the concentration of the fluorescence layer was 4% and 7%, respectively, compared to Experimental Example 1, where the fluorescence layer was not applied, the transmittance of the fluorescence layer was excellent at over 70%, and the color difference between the two colors was excellent at over 10. On the other hand, in Experimental Example 7, where the fluorescence layer with a concentration of 10% was applied, the transmittance was measured to be low at less than 70%, and the color contrast effect could not be obtained.

[0101] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent alternative embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. A driving layer containing charged particles dispersed in a fluid; A first electrode layer and a second electrode layer positioned on the upper and lower surfaces of the driving layer; and A light-emitting layer positioned on one of the upper surface of the first electrode layer and the lower surface of the second electrode layer, and including light-emitting particles that reflect or transmit specific light; Including, Active functional decorative film.

2. In paragraph 1, The above driving layer is an active functional decorative film comprising charged heterogeneous charged particles having different colors and polarities.

3. In paragraph 1, An active functional decorative film in which the charged particles in the driving layer are encapsulated in a dispersed form within the fluid.

4. In paragraph 1, An active functional decorative film, wherein the color difference between the driving layer and the second electrode layer varies by 10 or more before and after driving depending on the voltage applied between the first electrode layer and the second electrode layer.

5. In paragraph 1, An active functional decorative film, wherein the difference in visible light transmittance between the driving layer before and after driving is changed to 30 or more by a voltage applied between the first electrode layer and the second electrode layer.

6. In paragraph 1, An active functional decorative film in which one of the first electrode layer and the second electrode layer is formed as an electrode pattern, and the voltage applied between the first electrode layer and the second electrode layer causes the charged particles to aggregate on the electrode pattern, thereby controlling the transmittance of the driving layer.

7. In paragraph 1, The above driving layer is an active functional decorative film driven by any one of a polymer dispersed liquid crystal (PDLC) method, an electrochromic (EC) method, a suspended particle display (SPD) method, and an electrophoretic method.

8. In paragraph 1, An active functional decorative film having a thickness of the above-mentioned gloss layer of 2 um to 30 um.

9. In paragraph 1, The above-mentioned glazing layer is an active functional decorative film having a light transmittance of 50% or more in the visible light wavelength band.

10. In paragraph 1, The above-mentioned gloss layer is an active functional decorative film that blocks ultraviolet (UV) rays.

11. In paragraph 1, The above-mentioned luminous layer is divided into multiple areas having different luminous properties, An active functional decorative film, wherein each region having a different brightness is driven by a segment or thin film transistor (TFT) formed in one of the first electrode layer and the second electrode layer.

12. In paragraph 1, An active functional decorative film, wherein at least a portion of the above-mentioned gloss layer has a rough structure, or a predetermined pattern is formed or a predetermined texture is expressed on the surface of the above-mentioned gloss layer.

13. In paragraph 1, The above-mentioned luminous layer is an active functional decorative film including a QR code, a bar code or a logo.

14. In paragraph 1, An active functional decorative film wherein the above-mentioned luminous layer comprises metal particles, mica particles or particles exhibiting a holographic effect.

15. In paragraph 1, The above-mentioned luminous layer is an active functional decorative film formed by mixing the above-mentioned luminous particles and a color masterbatch.

16. In paragraph 1, An active functional decorative film, wherein the above-mentioned luminous particles are included in the luminous layer at a concentration of 1% to 7% by weight.

17. A driving layer comprising charged particles dispersed in a fluid; and It comprises a first electrode layer and a second electrode layer positioned on the upper surface and the lower surface of the driving layer; The above driving layer further comprises charged photoluminescent particles that reflect or transmit specific light, The above light particles are charged with different polarities from the above charged particles. Active functional decorative film.

18. In paragraph 17, An active functional decorative film, wherein the slope of the photoluminescent particles is changed by a voltage applied between the first electrode layer and the second electrode layer.

19. In paragraph 1 or paragraph 17, The above-mentioned photoluminescent particles are an active functional decorative film in which materials having different refractive indices are repeatedly arranged in a layered structure of two or more layers.

20. In paragraph 1 or paragraph 17, The above-mentioned luminescent particles are plate-shaped with a width of 3 um to 40 um, and are made of AlF 3 , MgF 2 , CaF 2 , SiO 2 , TiO x An active functional decorative film comprising any one of the following materials.

21. In paragraph 1 or paragraph 17, An active functional decorative film wherein the fluid has a different color from the charged particles.

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