Decorative film

Abstract

A decorative film is provided. The decorative film according to an embodiment includes a color layer; a plurality of color filling portions configured to one side of the color layer; and a cover layer including the color layer and the plurality of color filling portions. The plurality of color filling portions each include one side and another side facing in a thickness direction, and the color layer includes one side and another side facing in the thickness direction. The another side of each of the plurality of color filling portions is in contact with the one side of the color layer.

Description

Technical Field

[0001] This utility model relates to a decorative film, and more particularly to a decorative film that forms a decorated device by being adhered to a device. Background Technology

[0002] Decorative films can be adhered to electronic devices such as smartphones, building materials, and packaging equipment. They can also enhance the aesthetic appeal of the viewer by displaying specific colors. Recently, the importance of design elements incorporated through decorative films has become increasingly prominent. Utility Model Content

[0003] Compared to films that can only display a single color, decorative films that impart different colors based on viewing angle can give devices a more premium feel. However, it cannot be said that simply changing color based on viewing angle guarantees a premium feel. If the color changes erratically, it may actually distract the observer. Therefore, not only is proper design necessary to achieve the desired color changes, but the decorative film must also accurately reflect the design effect in the actual product.

[0004] The present invention aims to solve the problem of providing a decorative film that allows for precise control of color changes based on viewing angle.

[0005] The subject matter of this utility model is not limited to the subject matter mentioned above, and those skilled in the art will clearly understand other technical subject matters not mentioned from the following description.

[0006] To address the aforementioned issues, a decorative film according to one embodiment includes: a colored layer; a plurality of colored fillers disposed on one side of the colored layer; and a cover layer including the colored layer and the plurality of colored fillers; the plurality of colored fillers each including one side and another side facing each other in the thickness direction, the colored layer including one side and another side facing each other in the thickness direction, and the other side of each of the plurality of colored fillers contacting the one side of the colored layer.

[0007] Specific details of other embodiments are included in the detailed description and accompanying drawings.

[0008] The decorative film according to the embodiment allows for precise control of color changes based on viewing angle. This, in turn, enhances the aesthetics of the device to which the film is applied.

[0009] In addition, it can prevent the colored filler from deforming when subjected to external impact, thus providing excellent durability.

[0010] The effects of this utility model are not limited to those exemplified above; this specification also includes many other effects. Attached Figure Description

[0011] Figure 1 This is a perspective view of a decorated device according to one embodiment.

[0012] Figure 2 This is a plan view of a decorative film according to one embodiment.

[0013] Figure 3 This is a cross-sectional view of a decorative film according to one embodiment.

[0014] Figure 4 This is a schematic diagram illustrating the path of light reflected from a decorative film according to one embodiment.

[0015] Figure 5 This is a partial cross-sectional view of a decorative film according to one embodiment.

[0016] Figure 6 This is a schematic diagram used to illustrate the refraction and reflection of light in a decorative film according to an embodiment.

[0017] Figure 7 This is a cross-sectional view of the decorative film according to another embodiment.

[0018] Figure 8 This is a cross-sectional view of the decorative film according to yet another embodiment.

[0019] Figure 9 as well as Figure 10 This is a cross-sectional view of the decorative film according to yet another embodiment.

[0020] Figure 11 This is a schematic diagram illustrating the manufacturing process of a decorative film according to one embodiment.

[0021] Figure 12 This is a schematic cross-sectional view of the decorative film based on a manufacturing example.

[0022] Figure 13 This is a schematic cross-sectional view of the decorative film based on the comparative example.

[0023] Figure 14 The icon illustrates the color change rate of the decorative film from different viewing angles, based on the manufacturing example and the comparative example.

[0024] Figure 15 This is a schematic diagram illustrating the blurred boundaries between the color layer, the color filler, and the cover layer.

[0025] [Symbol Explanation]

[0026] 10: Decorated equipment

[0027] 11: Equipment

[0028] 100, 101, 102, 103, 104: Decorative film

[0029] 110: Color layer

[0030] 110a: First Zone

[0031] 110b: Second Zone

[0032] 120: Colored fill section

[0033] W1: Width of the colored fill area

[0034] W2: Spacing of colored filler area

[0035] H1: Height of the colored fill area

[0036] 130: Overlay

[0037] 130a: Gravure pattern

[0038] 140: Light-reflecting layer

[0039] 150: Light Absorption Layer

[0040] 160: Transparent substrate Detailed Implementation

[0041] The advantages and features of this utility model, and the method of achieving them, will become even clearer through the following detailed description of the embodiments with reference to the accompanying drawings. However, this utility model is not limited to the embodiments disclosed below, but can be implemented in many different forms. These embodiments are only intended to more completely disclose this utility model and to more fully introduce the scope of this utility model to those skilled in the art. This utility model should only be defined within the scope of the claims.

[0042] When an element or layer is described as being "on" other elements or layers, this includes not only cases where it is directly above other elements, but also cases where other layers or elements are interspersed in between. Conversely, when an element is described as being "directly on," it means that there are no other elements or layers in between. Throughout this specification, the same reference numerals denote the same constituent elements. "And / or" includes each item mentioned as well as all combinations thereof.

[0043] Although terms such as "first" and "second" are used to describe multiple constituent elements, these constituent elements are not limited by these terms. These terms are only used to distinguish one constituent element from other constituent elements. Therefore, the "first constituent element" mentioned below can also be the "second constituent element" within the technical concept of this utility model.

[0044] The terminology used in this specification is for illustrative purposes only and is not intended to limit the scope of the invention. In this specification, singular statements also have plural meanings unless explicitly stated otherwise. The use of "comprises" and / or "comprising" in this specification does not exclude the possibility that more than one other constituent element besides those mentioned may be present or added.

[0045] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in the meaning commonly understood by one of ordinary skill in the art to which this invention pertains. Furthermore, unless explicitly defined otherwise, terms that are commonly used and defined in dictionaries should not be given idealized or exaggerated interpretations.

[0046] To facilitate the description of the relationship between one component and another illustrated in the accompanying drawings, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used. These spatially relative terms, in addition to the directions illustrated in the drawings, should be understood as terms encompassing different orientations between components during use or operation. For example, if the components illustrated in the drawings are flipped, a component described as "below" or "beneath" of another component may be located "above" of that component. Therefore, the exemplary term "below" may encompass both the lower and upper directions. Components may also be configured in other directions, thus the spatially relative terms can be interpreted according to the configuration direction.

[0047] In this instruction manual, the terms "sheet", "film", and "layer" may be used interchangeably with each other and have the same meaning.

[0048] The embodiments of this utility model will now be described with reference to the accompanying drawings.

[0049] Figure 1 This is a perspective view of a decorated device according to one embodiment.

[0050] See Figure 1 The decorated device 10 may include device 11 and a decorative film 100 adhered to the surface (or appearance) of device 11.

[0051] Equipment 11 can refer to a utensil, apparatus, or device with a physical form. Equipment 11 can be, for example, an electronic device, building equipment, or glass. Examples of electronic devices include not only display devices such as smartphones, tablets (PCs), laptops, monitors, and televisions (TVs), but also household appliances such as refrigerators, air conditioners, and washing machines. Figure 1 In this example, a laptop computer is used as an example of an electronic device, but the embodiments are not limited thereto.

[0052] The decorative film 100 can be adhered to the surface of the device 11 to enhance its appearance. The decorative film 100 can also prevent scratches on the surface of the device 11 and cushion impacts applied to the device 11.

[0053] The decorative film 100 may have more than one color. In this specification, unless otherwise explicitly stated, color is used in the context of not only chromatic colors such as red, blue, green, and yellow, but also achromatic colors such as white, gray, and black. The colors expressed by the decorative film 100 can enhance the aesthetic appeal of the device 11. Furthermore, the decorative film 100 may also have specific patterns.

[0054] The decorative film 100 can have a color that changes depending on the viewing angle. That is, the decorative film 100 can be perceived as different colors depending on the viewing angle. These different colors include not only colors from completely different series, but also colors that, although belonging to the same series, are perceived as different colors due to color differences based on the viewing angle. The color change of the decorative film 100 as described above can be achieved through a color layer (…) provided on the decorative film 100. Figure 3 '110' in the middle) and the colored fill part ( Figure 3 The decorative film 100 will be implemented (120). Next, the decorative film 100 will be described in more detail.

[0055] Figure 2 This is a plan view of a decorative film according to one embodiment. Figure 2 In this example, the decorative film 100 is shown to have a rectangular planar appearance, but it is not limited to this. The planar appearance of the decorative film 100 may correspond to the shape of the area to which it is adhered. Figure 3 This is a cross-sectional view of a decorative film according to one embodiment.

[0056] See Figure 2 as well as Figure 3 The decorative film 100 may include a colored layer 110, a plurality of colored fillers 120 disposed on the colored layer 110, and a cover layer 130 covering the colored layer 110 and the plurality of colored fillers 120. Figure 3 In the illustrated example, the side of the decorative film 100 facing the device is the lower side of the colored layer 110, while the upper side of the cover layer 130 faces outwards. However, this is not a limitation; in some cases, the upper side of the cover layer 130 may be opposite to the device. Figure 1 The surfaces of the '10' in the middle are adhered together.

[0057] Color layer 110 can express a first color. Color layer 110 can express the first color by absorbing the complementary color of the first color. For example, color layer 110 may contain a first wavelength absorbing material that absorbs light in a first wavelength band (including the wavelength of the complementary color of the first color to be expressed). The first wavelength absorbing material may contain dyes and / or pigments.

[0058] The first wavelength-absorbing material can be a material that absorbs wavelengths within a specific range, but it is not limited to this; it can also be composed of a material that absorbs wavelengths within multiple specific ranges. In one embodiment, the first wavelength-absorbing material can be a material that absorbs both red and blue wavelengths simultaneously. In the case described above, the first wavelength-absorbing material will only reflect or refract green, therefore the color layer 110 can be identified as green. As another example, the first wavelength-absorbing material can be a material that absorbs green wavelengths. In the case described above, red and blue will be reflected or refracted, therefore the color layer 110 can be identified as the sum of the two, i.e., purple.

[0059] The colored layer 110 may also comprise a first resin. The first resin may be transparent. The first wavelength absorbing material may be dispersed or dissolved in the first resin. Examples of the first resin include, but are not limited to, (meth)acrylate resins, unsaturated polyester resins, polyester (meth)acrylate resins, silicone polyurethane (meth)acrylate resins, silicone polyester (meth)acrylate resins, fluoropolyurethane (meth)acrylate resins, or mixtures thereof.

[0060] In one embodiment, the color layer 110 may occupy the entire area of ​​the decorative film 100 in a plan view. In another embodiment, the color layer 110 may be configured only for a portion of the decorative film 100 in a plan view. In some embodiments, the color layer 110 may also form a specific pattern in a plan view.

[0061] In one embodiment, one side and the other side of the color layer 110 may each be linear in shape in a cross-sectional view. Furthermore, one side and the other side of the color layer 110 may be parallel. The color layer 110 may have a uniform thickness over the entire area.

[0062] The other side of the colored layer 110 is adhered to the device ( Figure 1 The other side of the color layer 110 may be the side with a plurality of fillers and a cover layer 130. In some embodiments, the device ( ) adhering to the other side of the color layer 110 Figure 1 The '10' in the text may contain a reflective material. The device adhering to the other side of the color layer 110 ( Figure 1 In the case that '10' in the decorative film 100 contains a reflective material, light that has been incident from the outside and passed through the decorative film 100 can be re-entered into the decorative film 100.

[0063] Multiple color fillers 120 can express a second color by absorbing the complementary color of the second color. Each color filler 120 may contain a second wavelength absorbing material that absorbs light in a second wavelength band (including the wavelength of the complementary color of the second color to be expressed). The second wavelength absorbing material may contain dyes and / or pigments.

[0064] In some embodiments, the second color may be different from the first color exhibited by the color layer 110.

[0065] As an example, the first color and the second color can be colors from completely different color families. In the case described above, the first wavelength absorbing material and the second wavelength absorbing material are different materials, and the wavelength bands they absorb can also be different. Even when the first color and the second color are colors from different color families, they do not have to be complementary colors, but this is not a limitation.

[0066] As another example, the first color and the second color can be colors from similar color families. In the case described above, the first wavelength absorbing material and the second wavelength absorbing material can be different materials, and the absorbed wavelength bands can largely overlap but have some differences.

[0067] As another example, the first color and the second color may belong to the same color family, but they can be identified as different colors due to differences in brightness and chroma. In the case described above, the first wavelength absorbing material and the second wavelength absorbing material are the same material, and they absorb the same wavelength band, but their distribution density may be different.

[0068] In other embodiments, the first color and the second color may be exactly the same color. In the case described above, the first wavelength absorbing material and the second wavelength absorbing material are the same material, and the wavelength bands they absorb are also the same, and therefore their distribution density may be substantially the same.

[0069] The colored filler portion 120 may also contain a second resin. The second resin may be transparent. The second wavelength absorbing material may be dispersed or dissolved in the second resin. Examples of the second resin include (meth)acrylate resin, unsaturated polyester resin, polyester (meth)acrylate resin, silicone polyurethane (meth)acrylate resin, silicone polyester (meth)acrylate resin, fluoropolyurethane (meth)acrylate resin, or mixtures thereof, but are not limited thereto. The second resin may be a different material from the first resin, or it may be the same material.

[0070] Multiple color filler portions 120 overlap with a portion of the color layer 110, but do not overlap with another portion. The multiple color filler portions 120 can directly contact the color layer 110. The multiple color filler portions 120 can have a structure that protrudes a specific height from one side of the color layer 110 they contact. One side of the color layer 110 can be divided into a first region 110a that contacts the color filler portions 120 and a second region 110b that does not contact the color filler portions 120, depending on whether it contacts them. The second region 110b of one side of the color layer 110 can directly contact the cover layer 130.

[0071] Multiple colored fill portions 120 may be spaced apart from each other in a plan view. Each colored fill portion 120 may be a line shape extending along a horizontal direction (e.g., a first direction) in a plan view. The width of each colored fill portion 120 (the width in the direction perpendicular to the extension direction) may remain constant along the extension direction. Furthermore, the widths of all multiple colored fill portions 120 may be constant.

[0072] The cross-section of each colored filler portion 120 cut along the thickness direction of the decorative film 100 can be polygonal. For example, the cross-sectional shape of the colored filler portion 120 can be an equilateral trapezoid. In the case described above, the side with the longer width of one parallel and facing side and the other side (i.e., the lower and upper sides of the equilateral trapezoid) of each colored filler portion 120 can be the surface in contact with the colored layer 110. The angle formed by the two sides of the colored filler portion 120 and the other side can be an acute angle. The width of the colored filler portion 120 in the cross-sectional view can gradually decrease while extending along the protruding direction. In the illustrated example, one side and the other side of the colored filler portion 120 in the cross-sectional view are flat in a straight line shape, but it can also be a curved shape such as a depression or a convex shape, or a triangular or bullet shape containing sharp corners, or it can contain a concave-convex structure.

[0073] The cover layer 130 is configured to simultaneously cover the plurality of colored fill portions 120 and the colored layer 110. The cover layer 130 can contact the second region 110b of the colored layer 110. The cover layer 130 can also contact the sides and one side of the plurality of colored fill portions 120. In the plan view, the cover layer 130 has the same shape as the colored layer 110 and can completely overlap with the colored layer 110.

[0074] One side of the cover layer 130 may be flat. In a cross-sectional view, one side of the cover layer 130 may be a straight line. One side of the cover layer 130 may be parallel to one side of the color layer 110.

[0075] The cover layer 130 can be transparent. The cover layer 130 allows most of the light passing through to be transmitted. The light transmittance of the cover layer 130 can be, for example, 80% or more, and further, 87% or more. The cover layer 130 can comprise a transparent third resin. Examples of the third resin include (meth)acrylate resin, unsaturated polyester resin, polyester (meth)acrylate resin, silicone polyurethane (meth)acrylate resin, silicone polyester (meth)acrylate resin, fluoropolyurethane (meth)acrylate resin, or mixtures thereof. The third resin can be different from the first and / or second resins described above, or it can be the same as one or both of them.

[0076] The cover layer 130 can absorb a portion of the light based on its light transmittance. Even when the cover layer 130 absorbs a portion of the light, unlike the color layer 110 or the color filler portion 120, the absorbed wavelength band can be uniform within the visible light wavelength range.

[0077] Figure 4This is a schematic diagram illustrating the path of light reflected from the decorative film 100 according to one embodiment. The term "viewing angle" as used in this specification refers to the angle measured along a direction perpendicular to the colored fill portion 120 extending to one side in a plan view, with reference to a normal perpendicular to one side or the other side of the colored layer 110. Figure 4 In this embodiment, a case is illustrated where refraction does not occur at the interface of the cover layer 130, the colored filler portion 120, and the colored layer 110 because they all have the same refractive index. Interface reflection is omitted. It is assumed that the external light is white light having all wavelengths within the visible light spectrum.

[0078] See Figure 4 When external light enters the decorative film, it passes through the cover layer 130. A portion of the light passing through the cover layer 130 directly enters the color layer 110, while another portion passes through the color filler portion 120 and enters the color layer 110. A reflective structure can be disposed on the other side of the color layer 110, and the light reflected by the reflective structure as described above will again pass through the color layer 110. A portion of the light passing through the color layer 110 will exit through the color filler portion 120 and the cover layer 130, while another portion of the light may exit through the cover layer 130 without passing through the color filler portion 120. The emitted light can be identified by an observer of the decorative film 100. The observer can identify the decorative film 100 as different colors based on the identified light path.

[0079] Next, the color changes described above will be explained in detail. The light rays within the decorative film 100 change along their travel path as they pass through the color layer 110 and the color filler portion 120. The longer the travel distance within the color layer 110, the higher the absorption rate of the first wavelength band light, thereby making the first color more vivid (i.e., increasing the chroma of the first color). Furthermore, the longer the travel distance within the color filler portion 120, the higher the absorption rate of the second wavelength band light, thereby making the second color more vivid (i.e., increasing the chroma of the second color). Moreover, when light passes through both the color layer 110 and the color filler portion 120 simultaneously, since both the first and second wavelength band light are absorbed, a corresponding color can be represented (e.g., a mixture of the first and second colors).

[0080] For example, from a frontal viewing angle (e.g., within 5 degrees) viewed from a direction close to the normal, a portion of the light ray L11 (e.g., light passing through the second region of the color layer 110 that is not in contact with the color filler portion 120) may bypass the color filler portion 120 and instead exit after passing only through the cover layer 130 and the color layer 110. The light ray L11 described above can be identified as the first color by the observer.

[0081] Furthermore, from a frontal viewpoint observed from a direction close to the normal, another portion of the light ray L12 (e.g., light passing through the first region of the color layer 110 in contact with the color fill portion 120) can pass through both the overlay layer 130 and the color layer 110, and both enter and reflect through the color fill portion 120. Because the light ray L12, as described above, travels a considerable distance inside the color fill portion 120 (e.g., twice the height of the color fill portion 120), the observer can perceive a mixed color formed by the mixing of the first color achieved through the color layer 110 and a distinct second color. For example, in the case of a red color layer 110 and a blue color fill portion 120, purple can be perceived, and the chroma and brightness of purple may change depending on which of the color layers 110 and the color fill portion 120 the light travels further.

[0082] When the width of the colored fill portion 120 and the spacing between the colored fill portions 120 are sufficiently large, an observer in a frontal view can identify the first color and the mixed color in a speckled pattern. However, when the width of the colored fill portion 120 is sufficiently small compared to the observer's distinguishing ability, the observer will not be able to distinguish the boundary between the first color and the mixed color, and thus will identify a color composed of two colors mixed together. For example, when the width and spacing of the colored fill portions 120 are set to less than 100 μm, the observer will not be able to identify the speckled pattern, but will instead be able to identify a single color.

[0083] Conversely, from a side viewpoint (e.g., around 45 degrees) viewed from a direction inclined relative to the normal, most of the light rays L21 and L22 pass through the overlay layer 130 and the color layer 110, and both enter and reflect via the color filler portion 120. Not only a portion of the light ray L21 passes through the first region of the color layer 110 in contact with the color filler portion 120, but another portion of the light ray L22 passes through the second region of the color layer 110 that is not in contact with the color filler portion 120, and also exits through the peripheral color filler portion 120. Therefore, most of the light rays emitted from the side can be identified as a mixture of the first color achieved by the color layer 110 and the second color achieved by the color filler portion 120.

[0084] As described above, the decorative film 100 allows the mixing of the first and second colors to be recognized from both front and side views. However, because the light travel paths from the front and side views are different, and the distances traveled through the color-filling portion 120 are also different, the actual recognized color may differ between the front and side views. Generally speaking, from the side view, light can travel a longer distance within the color-filling portion 120, thus enhancing the second color component. Through the process described above, a color change dependent on the viewing angle can be achieved.

[0085] Figure 5 This is a partial cross-sectional view of a decorative film 100 according to one embodiment.

[0086] See Figure 4 as well as Figure 5 The difference in color perceived from the front view and the side view can be related to factors such as the width, spacing and height of the colored filler 120.

[0087] As described above, the decorative film 100 according to one embodiment can have a color that changes depending on the viewing angle. For example, the decorative film 100 can present a color close to a first color in a frontal view and a color close to a second color in a side view, thereby presenting an aesthetic appeal. In the case described above, the width, spacing, and height of the color filling portion 120 can be factors used to achieve the desired colors for different viewing angles.

[0088] Specifically, the smaller the width W1 of the color-filled portion 120, the less the amount of the second color component can be in the frontal view. When the width W1 of the color-filled portion 120 decreases, the second color component in the side view may also decrease partially, but the degree of reduction can be less than in the frontal view. Therefore, when the width W1 of the color-filled portion 120 decreases, the color difference perceived in both the frontal and side views can increase. However, if the width W1 of the color-filled portion 120 is too small, it not only leads to manufacturing difficulties but may also result in insufficient color variation in the side view. For the reasons stated above, the width W1 of the color-filled portion 120 (based on the maximum width) can be between 5 μm and 50 μm.

[0089] Furthermore, the larger the width W2 of the color fill portion 120, the higher the purity of the second color in the frontal view. To achieve high purity of the first color in the frontal view, the spacing W2 of the color fill portions 120 can be 20 μm or more. Additionally, the ratio of the spacing W2 of the color fill portions 120 to the width W1 of the color fill portions 120 can be 2:1 or more.

[0090] However, if the spacing W2 of the color fill portions 120 is too large, it may not be possible to ensure that light rays emitted from a side view travel a sufficient distance through the color fill portions 120. For the reasons stated above, the spacing W2 of the color fill portions 120 can be 200 μm or less. Furthermore, the ratio of the spacing W2 of the color fill portions 120 to the width W1 of the color fill portions 120 can be 5:1 or less.

[0091] Furthermore, the greater the height H1 of the color-filled portion 120, the more color-filled portions 120 the light rays traveling from the front and side views can pass through, thereby increasing the distance traveled through the color-filled portions 120. Therefore, the color deviation in both front and side views can become greater. However, if the height H1 of the color-filled portion 120 is too large, it not only leads to manufacturing difficulties but may also cause an excessive increase in the thickness of the decorative film 100. For the reasons stated above, the height H1 of the color-filled portion 120 can be between 20 μm and 200 μm. Furthermore, the ratio of the height H1 of the color-filled portion 120 to the width W1 of the color-filled portion 120 can be between 2:1 and 10:1 or more.

[0092] Furthermore, the side of the color filler portion 120 can form an acute angle with reference to the boundary surface with the color layer 110, i.e., the other side of the color filler portion 120. For example, the tilt angles θ1 and θ2 formed by the side of the color filler portion 120 and the other side can be in the range of 85 degrees to 89 degrees. As described above, when the tilt angles θ1 and θ2 formed by the side of the color filler portion 120 are acute angles, color changes caused by slight shifts in viewing angle can be reduced from a frontal perspective. For example, when the tilt angles formed by the side of the color filler portion 120 are right angles or obtuse angles, color mixing may occur even with slight changes in frontal viewing angle. This may cause flickering or unclear recognition of content for the observer. Conversely, when the tilt angles θ1 and θ2 formed by the side of the color filler portion 120 are acute angles, the phenomenon described above can be reduced. For example, when the tilt angles θ1 and θ2 of the side of the color filler portion 120 are 85 degrees, abrupt color changes can be prevented within ±5 degrees of the normal.

[0093] The color filler portion 120 includes a first side surface located on one side of the first direction and a second side surface located on the other side of the first direction. In one embodiment, with one side surface of the color filler portion 120 as a reference, the first angle θ1 formed by the first side surface and the second angle θ2 formed by the second side surface may be the same.

[0094] In one embodiment, the color change described above can be expressed as the rate of color change across the viewing angle range using the L* (lightness), a* (degree of red and green), and b* (degree of blue and yellow) values ​​measured by optical measuring instruments and color measurement applications (e.g., color analyzers) at different viewing angles, and the color difference (ΔE) value calculated using the formula described below. In the following formula, ΔE*... ab This represents the rate of color change between the first and second viewpoints. L*1, a*1, and b*1 represent the color coordinates in the first viewpoint, while L*2, a*2, and b*2 represent the color coordinates in the second viewpoint.

[0095] 【formula】

[0096]

[0097] That is, the degree of color change based on the viewing angle can be judged by the deviations of L*, a*, and b* between specific angles.

[0098] As described above, for a decorative film 100 comprising a color layer 110, multiple color-filled portions 120 disposed on the color layer 110 and having a large aspect ratio, and a cover layer 130 covering the color layer and the multiple color-filled portions 120, the ΔE value based on viewing angle includes intervals where ΔE increases and intervals where ΔE decreases. In a ΔE graph showing the color change rate of each interval at 10-degree intervals from 0 degrees to 80 degrees with the normal direction as the reference, there may be at least three or more inflection points. At a 90-degree angle, i.e., in the direction parallel to the surface of the decorative film, it is almost impossible to measure the L*, a*, and b* values; therefore, the interval from 80 degrees to 90 degrees is excluded from the ΔE graph. The sum of the color change rates across all intervals (i.e., the cumulative color change rate by adding up the color change rates of all eight intervals) can be 50 or higher, while the color change rate at an 80-degree viewing angle with 0 degrees (normal) as the reference (i.e., the total color change rate between 0 degrees and 80 degrees) can be 40 or higher. Furthermore, to achieve a superior aesthetic, the total color change rate in the 0-30 degree interval should ideally be greater than that in the 30-80 degree interval, and the cumulative color change rate in the 10-30 degree interval should ideally be 30% or higher than the cumulative color change rate in the 0-80 degree interval. For example, the color change rate at 30 degrees with 0 degrees (normal) as the reference can be designed to be 50% or higher than the color change rate at 80 degrees, preferably 60% or higher.

[0099] With more than four inflection points, when the viewing angle increases from the normal (i.e., the position with a 0-degree angle) towards the side, flickering may occur due to irregular color changes. Therefore, three inflection points are preferable. Furthermore, when there is a small ΔE value from the normal direction and the viewing angle increases towards the side, it is advisable that after the ΔE value gradually increases, it decreases again from a specific angle. In the case described above, it is possible to maintain the color in the normal direction unchanged from the normal direction to a certain angle.

[0100] In one embodiment, the color change rate of the decorative film 100 may have a maximum value within a viewing angle range of 10 to 30 degrees. The maximum color change rate of the decorative film 100 may be between 10 and 13, but is not limited thereto. In some embodiments, the maximum color change rate of the decorative film 100 may be within a viewing angle range of 20 to 30 degrees. Furthermore, in some embodiments, the decorative film 100 may have a color change rate of 7 or higher across the entire viewing angle range of 10 to 30 degrees. That is, the minimum color change rate within a viewing angle range of 10 to 30 degrees may be 7 or higher. As described above, by having a maximum color change rate of 10 to 13 within a viewing angle range of 10 to 30 degrees, and ensuring a minimum color change rate of 7 or higher within the corresponding range, the color change based on viewing angle changes can be easily confirmed with the naked eye, thereby providing an excellent aesthetic experience for the decorative film 100.

[0101] Figure 6 This is a schematic diagram used to illustrate the refraction and reflection of light in a decorative film according to an embodiment.

[0102] See Figure 6 The covering layer 130, the colored filler 120, and the colored layer 110 within the decorative film 100 form interfaces with each other, and interface reflections may occur at these interfaces as described above. When the materials constituting the interfaces have different refractive indices, refraction or scattering may also occur during the passage of light through the interfaces, resulting in changes in the light path. Therefore, the more interfaces there are on the light path used to achieve the color, the more difficult it is to achieve the designed color from a side view. For example, if the reflection does not occur after the light has completely passed through the decorative film (100), but rather at the top of it, the target wavelength band may not be adequately absorbed. Furthermore, when the direction of travel of light changes significantly due to refraction or scattering, a color different from the designed color may be displayed. Therefore, in order to accurately achieve the required color deviation, it is advisable to reduce interface reflections, the angle of refraction of light, and the amount of scattering, or to design it to have a refraction angle optimized for the realization of the designed color.

[0103] On the decorative film 100 according to the embodiment, the colored filler portion 120 and the colored layer 110 are in direct contact and form an interface between them. In the structure described above, compared with the case described in the comparative example below where other layers such as a cover layer 130 are interposed between the colored filler portion 120 and the colored layer 110, the amount of interface reflection can be reduced and path separation phenomenon based on light refraction can be reduced. Therefore, the designed color can be achieved more precisely.

[0104] Furthermore, as described later, when manufacturing the decorative film 100, after the colored filler portion 120 and the cover layer 130 are formed by semi-curing the second resin and the third resin respectively, and the first resin is applied to form the colored layer 110 and then fully cured, the polymerization reaction between the cover layer 130 containing unreacted monomers and the colored filler portion 120 and the colored layer 110, and between the colored filler portion 120 and the colored layer 110, can blur or disappear the boundaries at each interface, thereby reducing reflection, refraction, and scattering at the interface, and improving the adhesion between them can minimize peeling defects and thereby improve durability.

[0105] Next, a decorative film according to another embodiment will be described.

[0106] Figure 7 This is a cross-sectional view of the decorative film 101 according to another embodiment. Figure 7 In the example shown, the decorative film 101 may further include a light-reflecting layer 140 disposed on the other side of the colored coating layer, a light-absorbing layer 150 disposed on the other side of the light-reflecting layer 140, and / or a transparent substrate 160 disposed on one side of the cover layer 130. On one side of the transparent substrate 160 opposite to the cover layer 130, a bottom coating layer comprising multiple protrusions with a diameter of tens to hundreds of nm and a thickness of less than 1 μm may also be provided. In the case described above, the adhesion between the transparent substrate 160 and the cover layer 130 can be improved, thereby easily achieving the cover layer 130 for forming the colored filler portion 120 with a large aspect ratio.

[0107] The light-reflecting layer 140 serves to reflect light passing through the colored coating layer to the upper side. When the light-reflecting layer 140 is used, the color to be achieved by the decorative film 100, which depends on the viewing angle, can be represented regardless of whether the adhered device contains a reflective structure or the color of the adhered device.

[0108] The light-reflecting layer 140 may occupy the entire area of ​​the decorative film 100 in a plan view. The light-reflecting layer 140 may completely overlap with the color layer 110 in a plan view, but is not limited to this. The light-reflecting layer 140 may have a uniform thickness throughout the entire area. The thickness of the light-reflecting layer 140 may, for example, be from 0.1 μm to 100 μm.

[0109] The light-reflecting layer 140 may contain a reflective material. For example, the light-reflecting layer 140 may contain one or more metallic materials selected from indium (In), titanium (Ti), tin (Sn), silicon (Si), germanium (Ge), aluminum (Al), copper (Cu), nickel (Ni), vanadium (V), tungsten (W), tantalum (Ta), molybdenum (Mo), niobium (Nb), iron (Fe), chromium (Cr), cobalt (Co), gold (Au), and silver (Ag). When the light-reflecting layer 140 contains tin (Sn), the light reflection effect can be further enhanced.

[0110] In other embodiments, the light-reflecting layer 140 may be an optical film having a structure consisting of tens to hundreds of alternating layers of low-refractive and high-refractive layers extending to one side, and having a reflective axis in the direction of extension. As described above, it can have a light transmittance of 50% or more, thus allowing it to be used as a transparent decorative film for identifying objects on the opposite side, such as in a refrigerator counter. Furthermore, in another embodiment, a light transmittance of less than 10% can be achieved by stacking two optical films with their reflective axes perpendicular to each other, thereby realizing a decorative film with a better brightness-to-dark ratio. As described above, the reflective axis direction on the plane of the optical film adjacent to the color layer 110 can be further improved by aligning it to a direction substantially the same as the extension direction of the color-filled portion 120, i.e., the first direction. Furthermore, both improved brightness-to-dark ratio and prevention of moiré patterns can be achieved by arranging them at an angle to each other within a range of 10 degrees.

[0111] The light-absorbing layer 150 absorbs a portion of the light passing through the light-reflecting layer 140. Furthermore, the light-absorbing layer 150 blocks light incident from the device side onto the decorative film 101 side. As a result of using the light-absorbing layer 150, unwanted light is blocked from entering the decorative film 101, thus making it easier to achieve the designed color.

[0112] The light-absorbing layer 150 may occupy the entire area of ​​the decorative film 101 in a plan view. The light-absorbing layer 150 may completely overlap with the color layer 110 and / or the light-absorbing layer 150 in a plan view, but is not limited thereto. The light-absorbing layer 150 may have a uniform thickness throughout the entire area. The thickness of the light-absorbing layer 150 may, for example, be from 2 μm to 100 μm.

[0113] The light-absorbing layer 150 may contain a light-absorbing material. For example, the light-absorbing layer 150 may contain carbon black and black pigments, but is not limited to these. It may also contain one or more metallic substances selected from indium (In), titanium (Ti), tin (Sn), silicon (Si), germanium (Ge), aluminum (Al), copper (Cu), nickel (Ni), vanadium (V), tungsten (W), tantalum (Ta), molybdenum (Mo), niobium (Nb), iron (Fe), chromium (Cr), cobalt (Co), gold (Au), and silver (Ag).

[0114] The transparent substrate 160 serves to protect the cover layer 130. The transparent substrate 160 can be retained after the decorative film 100 is adhered to the device, or it can be removed after adhesion. The transparent substrate 160 can have a thickness from 10 μm to 250 μm. The transparent substrate may, for example, comprise at least one material selected from the group consisting of polypropylene (PP), polyethylene (PE), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC), polyoxymethylene (POM), polyamide (PA), polyphenylene ether (PPO), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), polyphenylene sulfide (PPS), polyimide (PI), polyamide-imide (PAI), and polyethyleneimine (PEI).

[0115] As Figure 7 The variant examples can be omitted. Figure 7 At least one of the light-reflecting layer 140, light-absorbing layer 150, and transparent substrate 160 shown in the figure.

[0116] Figure 8 This is a cross-sectional view of the decorative film according to yet another embodiment.

[0117] See Figure 8 According to this embodiment, the decorative film 102 and Figure 3The difference in this embodiment lies in that the side surface of the color-filled portion 120 is asymmetrical. The color-filled portion 120 includes a first side surface located on one side of the first direction and a second side surface located on the other side of the first direction. Based on one side surface of the color-filled portion 120, the first angle θ1 formed by the first side surface is greater than the second angle θ2 formed by the second side surface. For example, the first angle θ1 can be 89 degrees or more but less than 90 degrees, or 89 degrees or more but less than 90 degrees, while the second angle θ2 can be 85 to 89 degrees. In the case described above, from a viewing angle tilted towards the other side of the first direction from the front, the color-changing effect based on the viewing angle change can be presented later compared to a viewing angle tilted towards the other side. When the first and second sides of all the color-filled portions 120 are in the relationship described above, different colors can also be displayed at the same viewing angle based on the front.

[0118] Figure 9 as well as Figure 10 This is a cross-sectional view of the decorative film according to yet another embodiment. Figure 9 as well as Figure 10 In some embodiments, the cross-sectional shape of the other side of the colored filling portion 120 of the decorative films 103 and 104 can be a raised or recessed curve. Figure 9 as well as Figure 10 In some embodiments, one side of the color layer 110 that contacts the other side of the color filler portion 120 may have a surface shape that corresponds to (or complements) that side. In the case described above, although the other side of the color layer 110 may also be flat, it is not limited thereto, and may also have a concave or convex shape that reflects the shape of the other side of the color filler portion 120 that contacts one side of the color layer 110.

[0119] The shape of the other side of the color-filled portion 120 as described above can be determined according to the manufacturing process, which involves forming the color-filled portion 120 within the gravure pattern after forming the gravure pattern on the cover layer 130. Although the structural differences described above may differ from... Figure 3 Compared to embodiments that induce subtle color changes based on viewing angle, this approach can precisely achieve viewing angle-dependent color changes. Figure 3 The implementation examples are similar.

[0120] Figure 11 This is a schematic diagram illustrating the manufacturing process of a decorative film 100 according to an embodiment.

[0121] See Figure 11A cover layer 130 including an intaglio pattern 130a is formed on a transparent substrate 160. The intaglio pattern 130a can be formed by pressurizing and curing a hard or soft mold after or during the application of a third resin. As another example, the cover layer 130 including the intaglio pattern 130a can be formed on a transparent substrate 160 by applying a third resin to a hard or soft mold to form an intaglio pattern 130a corresponding to the mold shape, and then fitting it onto the transparent substrate 160. In order to allow sufficient polymerization reaction with the second and / or first resins in subsequent processes, the cover layer 130 can be formed in a semi-cured state to a degree that removes the flowability of the third resin.

[0122] Next, the colored filling portion 120 is formed by filling the gravure pattern 130a of the cover layer 130 with the second resin and removing the second resin residue in the cover layer 130, followed by curing. During curing, in order to form the colored filling portion 120 bonded to the gravure pattern 130a of the cover layer 130 through polymerization reaction with the third resin, and to ensure sufficient polymerization reaction with the first resin in subsequent processes, semi-curing can be performed to a degree that removes the fluidity of the second resin.

[0123] When forming the gravure pattern 130a with a narrower width and a deeper depth, poor filling of the second resin or a decrease in filling speed may occur. To prevent this, the second resin may contain a solvent. The solvent in the second resin can be removed by a separate drying process before the curing process of the second resin. In the case described above, a colored filling portion 120 recessed on the other side may also be formed.

[0124] Next, a colored layer 110 can be formed by applying a first resin to the other side of the cover layer 130 and the colored filler portion 120 and then curing it. During the curing of the first resin, the semi-cured colored filler portion 120 and the colored layer 110 undergo a polymerization reaction, resulting in a strong bond. The other side of the colored layer 110 can be formed flat, and the thicknesses of the first region 110a of the colored layer 110 opposite to the colored filler portion 120 and the second region 110a of the colored layer 110 opposite to the cover layer 130 can be different, but are not limited to this.

[0125] Figure 15 This is a schematic diagram illustrating the blurred boundaries between the color layer, the color filler, and the cover layer.

[0126] As described above, after the colored filler 120 and the cover layer 130 are formed by semi-curing the second resin and the third resin respectively, and the first resin is applied and then fully cured in order to form the colored layer 110, the bonding strength can be improved by the polymerization reaction between the cover layer 130 containing unreacted monomers and the colored filler 120 and the colored layer 110, and between the colored filler 120 and the colored layer 110.

[0127] For example, such as Figure 15 As shown, the boundaries at each interface can be blurred or eliminated, thereby minimizing unintended refraction, reflection, and scattering at each interface. Furthermore, when using the decorative film in high-temperature and / or hazardous environments, it prevents further degradation of adhesion caused by the penetration of oxygen and moisture into the interface opposite the colored layer 110.

[0128] Next, a light-reflecting layer 140 can be formed on the other side of the color layer 110, and a light-absorbing layer 150 can be formed on the other side of the light-reflecting layer 140, thereby completing the process as follows: Figure 7 The decorative film 100 shown.

[0129] Next, the embodiments will be described in more detail through manufacturing examples and test examples.

[0130] <Manufacturing Example>

[0131] A transparent polyurethane acrylate resin with a liquid refractive index (RI) of 1.53 is coated on one side of a 250 μm thick transparent polyethylene terephthalate (PET) film (V7610, SKC). A pattern mold is then prepared to form a trapezoidal embossed pattern extending parallel to one side at 30 μm intervals, with two inclined surfaces having an inclination angle of 88 degrees, a height of 70 μm, an upper width of 8 μm, and a lower width of 12 μm. The other side of the transparent polyethylene terephthalate (PET) film is then pressed using the pattern mold and cured by irradiation with ultraviolet light (UV). A cover layer with a total thickness of 80 μm is formed on the other side of the transparent polyethylene terephthalate (PET) film, including an intaglio pattern opposite to the embossed pattern.

[0132] The intaglio pattern was filled by applying a second resin comprising 94 wt% polyurethane acrylate resin with a liquid refractive index (RI) of 1.53 and 6 wt% red dye onto the cover layer, and the second resin remaining on the outside of the intaglio pattern was removed using a scraper. Next, the second resin inside the intaglio pattern was cured by irradiation with ultraviolet light, thereby forming a colored filling portion within the cover layer with a thickness less than that of the cover layer.

[0133] A colored layer with a thickness of 10 μm was formed by coating a first resin containing 94 wt% polyurethane acrylate resin with a liquid refractive index (RI) of 1.53 and 6 wt% blue dye onto a cover layer equipped with colored fillers, followed by covering with a 50 μm thick release film (SG-31, SKC) and irradiating with ultraviolet light (UV).

[0134] Next, a decorative film with a total thickness of 190 μm was manufactured by removing the release film. Figure 12 The figure shows a schematic cross-sectional view of the decorative film according to a manufacturing example.

[0135] <Comparative Example>

[0136] A transparent polyurethane acrylate resin with a liquid refractive index (RI) of 1.53 is coated on one side of a 250 μm thick transparent polyethylene terephthalate (PET) film (V7610, SKC). A pattern mold is then prepared to form a trapezoidal relief pattern with two inclined surfaces extending parallel to one side at 30 μm intervals, having an inclination angle of 88 degrees, a height of 70 μm, an upper width of 8 μm, and a lower width of 12 μm. After pressing one side of the transparent polyethylene terephthalate (PET) film with the pattern mold and curing it with ultraviolet light (UV), a cover layer with a total thickness of 80 μm is formed on one side of the transparent polyethylene terephthalate (PET) film, including an intaglio pattern opposite to the relief pattern.

[0137] The intaglio pattern was filled by applying a second resin comprising 94 wt% polyurethane acrylate resin with a liquid refractive index (RI) of 1.53 and 6 wt% red dye onto the cover layer, and the second resin remaining on the outside of the intaglio pattern was removed using a scraper. Next, the second resin inside the intaglio pattern was cured by irradiation with ultraviolet light, thereby forming a colored filling portion within the cover layer with a thickness less than that of the cover layer.

[0138] A colored layer with a thickness of 10 μm was formed by coating the other side of the 250 μm thick transparent polyethylene terephthalate (PET) film (V7610, SKC) with a first resin comprising 94 wt% polyurethane acrylate resin with a liquid refractive index (RI) of 1.53 and 6 wt% blue dye, followed by covering it with a 50 μm thick release film (SG-31, SKC) and irradiating it with ultraviolet light (UV).

[0139] Next, a decorative film with a total thickness of 190 μm was manufactured by removing the release film. Figure 13 The figure shows a schematic cross-sectional view of the decorative film according to the comparative example.

[0140] <Experimental Example 1> Evaluation of Color Coordinates Based on Viewpoint

[0141] After cutting the decorative film sample according to the manufacturing example and Comparative Example 1 into 70mm*70mm pieces, a reflective sheet (product name: RF 188) was placed on the lower part of the color layer. Using the camera of a smartphone and an application that can measure color, namely Color Analyzer, the L*, a*, and b* values ​​of each viewing angle were measured at 10-degree intervals in the range of 0 degrees (normal) to 80 degrees in a direction perpendicular to the extension direction of the color filling part.

[0142] The results of Experiment 1 are shown in Table 1.

[0143] Table 1

[0144]

[0145]

[0146] <Experimental Example 2> Evaluation of Color Change Rate Based on Viewing Perspective

[0147] Using the L*, a*, and b* values ​​measured in Experimental Example 1, the color change rate (ΔE*) for each interval varying in 10-degree increments centered on the normal was calculated by applying the formula described below. ab ).

[0148]

[0149] The results for each interval of Experiment Example 2 are shown in Table 2.

[0150] Table 2

[0151]

[0152] In addition, Figure 14 The results of test example 2 are illustrated in the figure. Figure 15 In the diagram, the horizontal axis represents the viewing angle range, while the vertical axis represents the color change rate (ΔE*) within each range. ab ).

[0153] Refer to Table 2 and Figure 14 The manufacturing example, where the colored filler portion and the colored layer are in direct contact, exhibits a significantly larger color change rate within a viewing angle range of 10 to 30 degrees, compared to a comparative example where a transparent substrate and a transparent pattern are interposed between the colored filler portion and the colored layer. Furthermore, it also exhibits a relatively large color change rate within a viewing angle range of 30 to 80 degrees.

[0154] Based on the results in Table 1, the color change rate at 30 degrees and at 80 degrees, calculated with the normal (0 degrees) as the reference, are shown in Table 3 below.

[0155] Table 3

[0156]

[0157] Referring to Table 3, it can be confirmed that the color change rate in the comparative example at angles of 0 to 30 degrees is 37% of the overall color change rate at angles of 0 to 80 degrees, while it is 61% in the manufactured example. This shows that the manufactured example achieves a significantly higher color change rate at angles that better express aesthetics compared to the comparative example.

[0158] The test examples confirmed that the manufacturing example formed by direct contact between the colored filler portion and the colored layer exhibits a superior color change rate based on viewing angle compared to the comparative example where a transparent substrate and a transparent pattern are interposed between the colored filler portion and the colored layer.

[0159] Generally, objects are observed at angles within 30 degrees of the normal. For example, privacy films used in electronic devices such as laptops and mobile phones typically set the optimal viewing angle for user privacy protection at 30 degrees. Therefore, for decorative films that exhibit aesthetic appeal based on viewing angle, the effect is likely most significant when the optimal color change rate is displayed within an angle of 30 degrees. However, a large color change rate at angles close to the normal (within 10 degrees) may lead to a decrease in aesthetic appeal due to flickering; therefore, it is preferable to exhibit the maximum color change rate within an angle of 10 to 30 degrees. From this perspective, it can be confirmed that the decorative film according to the manufacturing example has a relatively higher aesthetic appeal compared to the comparative example.

[0160] Furthermore, although the colored filler portion of the decorative film has a very narrow width, it can have a thickness that is relatively large compared to its width. In the case described above, unintended color distortion may occur due to easy deformation upon external impact. However, unlike the comparative example, the manufacturing example can minimize the deformation of the colored filler portion even upon external impact by providing a covering layer and a substrate on the outline, thereby preventing color distortion.

[0161] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, those skilled in the art to which this invention pertains should understand that the present invention can be implemented in other specific forms without altering its technical concept or essential features. Therefore, the embodiments described above are merely exemplary in all respects and not limiting.

Claims

1. A decorative film, characterized in that, The decorative film includes: Color layer; Multiple colored fillers are disposed on one side of the colored layer; and, A cover layer that covers the color layer and the plurality of color fill portions; The plurality of colored filling portions are respectively included on one side and another side facing each other in the thickness direction. The color layer includes one side facing each other and another side facing each other in the thickness direction. The other side of each of the plurality of colored fillers contacts the other side of the colored layer.

2. The decorative film according to claim 1, characterized in that, The color layer includes a first wavelength absorption substance that exhibits the first color by absorbing the complementary color of the first color. The plurality of colored filling portions include a second wavelength absorbing material that exhibits the second color by absorbing the complementary color of the second color. The overlay is transparent.

3. The decorative film according to claim 2, characterized in that, The cross-sectional shape of each of the plurality of colored fillers is a trapezoidal shape in which one side is parallel to the other side and the width of the one side is less than the width of the other side. The angle formed by the first side on one side and the second side on the other side with the other side is an acute angle.

4. The decorative film according to claim 3, characterized in that, The width of the other side of each of the plurality of colored fillers is 5 μm to 50 μm. The spacing between the plurality of colored fillers is 20 μm to 200 μm.

5. The decorative film according to claim 4, characterized in that, The ratio of the spacing between the plurality of colored fill portions to the width of the plurality of colored fill portions is 5:1 or less.

6. The decorative film according to claim 4, characterized in that, The height of the plurality of colored fillers is 20 μm to 200 μm.

7. The decorative film according to claim 6, characterized in that, The ratio of the height to the width of the plurality of colored fill portions is 2:1 to 10:

1.

8. The decorative film according to claim 1, characterized in that, The angle formed by the side of the plurality of colored fillers and the other side of the plurality of colored fillers is in the range of 85 degrees to 89 degrees.

9. The decorative film according to claim 8, characterized in that, The sides of the plurality of colored fillers include a first side located on one side of the first direction and a second side located on the other side of the first direction. The angle formed by the first side and the other side of the plurality of colored filling portions is greater than the angle formed by the second side and the other side of the plurality of colored filling portions.

10. The decorative film according to claim 1, characterized in that, The color change rate of the decorative film at a viewing angle of 0 to 30 degrees is greater than that at a viewing angle of 30 to 80 degrees.

11. The decorative film according to claim 1, characterized in that, The color change rate of the decorative film at a viewing angle of 0 to 30 degrees is more than 50% of the color change rate at a viewing angle of 0 to 80 degrees.

12. The decorative film according to claim 11, characterized in that, The decorative film has a color change rate measured in 10-degree intervals across various viewing angles from 0 to 80 degrees. The cumulative color change rate in the 10-30 degree range is more than 30% of the cumulative color change rate in the 0-80 degree range.

13. The decorative film according to claim 12, characterized in that, The color change rate of each interval has 3 inflection points.

14. The decorative film according to claim 12, characterized in that, The sum of the cumulative color change rates of each interval of the decorative film is greater than 50.

15. The decorative film according to claim 1, characterized in that, The decorative film also includes: A light-reflecting layer is disposed on the other side of the color layer.

16. The decorative film according to claim 15, characterized in that, The decorative film also includes: A light-absorbing layer is disposed on the other side of the light-reflecting layer.

17. The decorative film according to claim 1, characterized in that, The cross-sectional shape of the other side of the plurality of colored fillers is a convex or concave curve.

18. The decorative film according to claim 17, characterized in that, One side of the color layer that is in contact with the plurality of color fillers has a surface shape corresponding to the other side of the plurality of color fillers.

Images