Color-changing and heating film comprising electrochromic layer capable of controlling non-colored region

Abstract

A color-changing and heating film according to an embodiment of the present invention is formed by stacking a first transparent substrate, a first transparent conductive layer, an electrochromic layer including colored and non-colored regions according to changes in transparency, a second transparent conductive layer, and a second transparent substrate, wherein a connection form between electrodes disposed on top of and beneath the electrochromic layer and the direction and magnitude of an applied voltage are changed to control the forming position and area of the non-colored region, and the magnitude of heat generation is controlled such that transparency and aesthetics can be improved while a heat insulating effect is maximized. Whereas a conventional heating film and electrochromic film are individually coupled to a window and used, a hybrid-type product, according to an embodiment of the present invention, in which a heating function is added to one color conversion film or electrochromic film is provided. In addition, whereas a transparent conductive layer is patterned in a complicated way in order to implement a conventional shading function, an electronic shading function such as that of blinds or curtains, according to an embodiment of the present invention, can be implemented by freely adjusting a non-colored region to the left and right or up and down simply through bus bar electrode arrangement, connection and voltage control without patterning.

Description

A color-changing heating film comprising a color-changing layer capable of controlling the non-discoloration area

[0001] The present invention relates to a transparent heating film that actively reduces heat transfer coefficient to maximize insulation effect while simultaneously exhibiting a view blocking effect, including a color conversion layer whose transparency can be adjusted to control the amount of light transmitted and a heating layer that is transparent and capable of generating surface heat.

[0002]

[0003] Transparent conductive films, or transparent conductive layers, transmit light in the visible spectrum, infrared, or ultraviolet, while maintaining conductivity. Leveraging these properties of transparency and conductivity, transparent conductive layers are used in numerous electronic devices, including mobile devices.

[0004] Indium oxide (InO) as a material for the transparent conductive layer x ), tin oxide (SnO x ) or their compounds such as indium tin oxide (ITO) or zinc oxide (ZnO) are widely used. In addition to the above-mentioned inorganic materials, conductive polymer materials are also being actively studied for application as transparent conductive layers in products.

[0005]

[0006] A color conversion film or color conversion layer (electrochromic layer) undergoes a redox reaction upon application of voltage or current through a busbar or electrode made of a highly conductive metal material arranged on one or both sides. Accordingly, the color conversion film or color conversion layer changes in transparency as it is colored or discolored, or in accordance with a change in the state of the liquid crystal or electronic ink. The transparency of the color conversion layer can vary in ratio depending on the frequency band of light, and the user can adjust the light transmittance of a desired frequency band by selecting the material and controlling the applied power.

[0007]

[0008] Recently, active research has been conducted on smart windows utilizing color-conversion layers to make glass walls used as conference room partitions opaque or to block sunlight entering through external windows. However, these technologies only serve to block external light and do not prevent or block the inflow or outflow of heat energy.

[0009]

[0010] Meanwhile, when applying voltage through busbars or electrodes positioned on one surface of the color conversion layer to induce a change in transparency of the color conversion layer and thereby generate heat, a non-discoloring region where the transparency does not change may be formed in a portion of the color conversion layer between the busbars or electrodes. Therefore, when using the color conversion film for windows or conference room walls, this non-discoloring region inevitably presents a functional and aesthetic disadvantage.

[0011]

[0012] Related prior art includes Korean Patent Registration No. 10-2583695 (Title of invention: Transparent conductive film for electrochromic film and method for manufacturing the same).

[0013]

[0014] In order to solve the above problems, an embodiment of the present invention provides a color-changing heating film including a color-changing layer that can be easily attached to a window or installed close to a window to control the transmittance of light incident from the outside while simultaneously blocking heat energy flowing in and out to the outside, thereby maximizing the insulation effect.

[0015] In addition, when applying voltage to the color conversion layer in winter, the heat transmission coefficient can be reduced while maximizing the incidence of sunlight, thereby preventing heat leakage from the interior as much as possible. When applying voltage to the color conversion layer, the color conversion layer changes to a discolored heating state, and a non-discolored area in which transparency does not change in some areas may be formed. For this non-discolored area, the embodiment of the present invention allows the formation position and size of the non-discolored area to be arbitrarily controlled by controlling the electrode arrangement, the direction of voltage application, and the size. Through this, a discolored heating film that can perform an external light blocking function in various forms by freely changing an opaque or transparent part, such as a blind or curtain, is provided. This function will be called "electronic shading."

[0016] In addition, the embodiment of the present invention controls the electrode arrangement, voltage application direction and size so that the non-discoloration area can be formed only within a narrow space at the edge of the color conversion layer, thereby enabling a uniform external light blocking effect to be exerted across the entire area of ​​the color conversion layer while simultaneously solving the problem of deteriorating aesthetic elements.

[0017]

[0018] The problems to be solved by the present invention are not limited to the problem(s) mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0019]

[0020] A color-changing heating film including a color-changing layer capable of controlling a color-changing region and a non-discoloring region according to an embodiment of the present invention comprises: a first transparent substrate formed of a transparent material; a first transparent conductive layer formed on the first transparent substrate and formed of a transparent conductive material; a color-changing layer formed on the first transparent conductive layer and including the color-changing region whose transparency changes according to application of an electric field and the non-discoloring region whose transparency does not change; a second transparent conductive layer formed on the color-changing layer and formed of a transparent conductive material; a second transparent substrate formed on the second transparent conductive layer and formed of a transparent material; a first lower electrode and a second lower electrode formed on an upper surface of the first transparent conductive layer and spaced apart from each other in a first direction and arranged side by side; And a first upper electrode disposed on the lower surface of the second transparent conductive layer; wherein one of the first lower electrode or the second lower electrode and the first upper electrode are electrically connected, and by applying an alternating current or direct current voltage between the first lower electrode and the second lower electrode, heat generation of the first transparent conductive layer is induced, and by controlling the direction and size of the application of the voltage, the formation location and size of the area of ​​the non-discoloration region can be adjusted.

[0021] In the above embodiment, the non-discoloration region may be formed close to one of the first lower electrode or the second lower electrode that is electrically connected to the first upper electrode.

[0022] In the above embodiment, a control unit may be included that electrically connects the first upper electrode to one of the first lower electrode or the second lower electrode.

[0023] In the above embodiment, a control unit is included that controls the magnitude of the voltage applied between the first lower electrode and the second lower electrode, and when the voltage applied through the control unit increases, the area of ​​the unmodified region can be reduced.

[0024] In the above embodiment, when the applied voltage through the control unit increases, the boundary between the discolored region and the non-discolored region can move toward one of the first lower electrode or the second lower electrode that is electrically connected to the first upper electrode.

[0025] In the above embodiment, a second upper electrode may be formed on the lower surface of the second transparent conductive layer and arranged parallel to the first upper electrode in a second direction different from the first direction.

[0026] In the above embodiment, a control unit may be included that electrically connects one of the first upper electrode or the second upper electrode to one of the first lower electrode or the second lower electrode.

[0027] In the above embodiment, the control unit can induce heat generation of the second transparent conductive layer by applying an alternating current or direct current voltage between the electrode that is not connected to the first upper electrode among the first lower electrode or the second lower electrode and the second upper electrode.

[0028] In the above embodiment, when the voltage applied between the electrode not connected to the first upper electrode among the first lower electrode or the second lower electrode and the second upper electrode is 90 V or more, the non-discoloration region may be formed in proximity to the connection portion area where the first upper electrode is electrically connected to one of the first lower electrode or the second lower electrode.

[0029] An electronic sunshade having a blind curtain function according to another embodiment of the present invention may include a color-changing heating film according to the above embodiments.

[0030] According to another embodiment of the present invention, a color-changing film including a color-conversion layer capable of controlling a discoloration area and a non-discoloration area is provided, comprising: a first transparent substrate formed of a transparent material; a first transparent conductive layer formed on the first transparent substrate and formed of a transparent conductive material; a color-conversion layer formed on the first transparent conductive layer and including the discoloration area whose transparency changes according to application of an electric field and the non-discoloration area whose transparency does not change; a second transparent conductive layer formed on the color-conversion layer and formed of a transparent conductive material; a second transparent substrate formed on the second transparent conductive layer and formed of a transparent material; a first lower electrode and a second lower electrode formed on an upper surface of the first transparent conductive layer and spaced apart from each other in a first direction and arranged side by side; And a first upper electrode and a second upper electrode formed on the lower surface of the second transparent conductive layer and arranged side by side and spaced apart in a second direction different from the first direction; wherein discoloration of the color conversion layer is induced by applying an alternating current or direct current voltage between one of the first lower electrode or the second lower electrode and the first upper electrode, and the size of the formation position and area of ​​the non-discoloration region can be adjusted by controlling the magnitude of the voltage.

[0031]

[0032] According to an embodiment of the present invention, the transparency is adjusted by applying an electric field to the color conversion layer, thereby adjusting the transmittance of incident light, and the surface heating is induced by applying an electric field to the transparent conductive layer, thereby reducing the thermal transmittance, so as to maximize the insulation effect from the outside. At this time, by attaching a color-changing heating film or electronic visor according to an embodiment of the present invention to a window glass measuring 2 m in length and width, the thermal transmittance is increased to 1.6 W / m even with only heating at 25°C or less. 2 0.9 W / m in K 2K. In addition, according to an embodiment of the present invention, by arranging electrodes on both sides of the color conversion layer, adjusting the wiring shape of the electrodes, and adjusting the magnitude of the voltage applied to the electrodes, the non-discoloration area can be minimized, thereby maximizing the insulation performance and aesthetics. In addition, by taking advantage of the formation of the non-discoloration area in the color conversion layer, the boundary between the discoloration and non-discoloration areas can be controlled by controlling the magnitude and application direction of the voltage, thereby performing additional functions such as electronic shading. At this time, by adjusting the magnitude of the voltage applied to the color conversion layer, the non-discoloration area can be moved to the four ends of the discoloration heating film, and as the voltage increases, the discoloration and the heating temperature increase simultaneously, thereby increasing the insulation effect. In addition, the convenience can be greatly improved by integrating the discoloration heating film with an IoT device and setting it to be arbitrarily controlled remotely.

[0033]

[0034] Figure 1 is a front view schematically illustrating a color-changing heating film according to an embodiment of the present invention.

[0035] FIG. 2 is a side view schematically illustrating a color-changing heating film according to an embodiment of the present invention.

[0036] FIGS. 3A to 3F are drawings showing examples of non-discoloration regions formed in various ways when voltage is applied through electrodes arranged in various ways on one surface of a color conversion layer.

[0037] FIG. 4 is a drawing showing an example of a non-discoloration area formed depending on the magnitude of the applied voltage through the electrode arrangement according to an embodiment of the present invention.

[0038] FIGS. 5A to 5D are drawings showing examples of non-discoloration regions formed in various ways depending on the wiring shape of electrodes in a color-changing heating film according to an embodiment of the present invention.

[0039] FIG. 6a and FIG. 6b are drawings showing examples of non-discoloration regions formed in various ways depending on the wiring shape of electrodes in a color-changing heating film according to an embodiment of the present invention.

[0040] Fig. 7 is a drawing showing an actual implementation example of a color-changing heating film according to an embodiment of the present invention.

[0041] FIGS. 8A and 8B are drawings showing examples of non-discoloration regions formed according to the magnitude of the voltage applied to the electrodes and the wiring shape of the electrodes in a color-changing heating film according to an embodiment of the present invention.

[0042]

[0043] The advantages and / or features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

[0044]

[0045] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0046] Figure 1 is a front view schematically illustrating a color-changing heating film according to an embodiment of the present invention.

[0047] Referring to FIG. 1, a color-changing heating film according to an embodiment of the present invention includes a first transparent substrate (11), a first transparent conductive layer (12) formed on top of the first transparent substrate (11), a color conversion layer (14) formed on top of the first transparent conductive layer (12), a second transparent conductive layer (16) formed on top of the color conversion layer (14), and a second transparent substrate (17) formed on top of the second transparent conductive layer (16).

[0048] A color-changing heating film according to an embodiment of the present invention includes a first lower electrode (13a), a second lower electrode (13b), and a first upper electrode (15a) for applying voltage to a color conversion layer (14). The first lower electrode (13a) and the second lower electrode (13b) are formed on the upper surface of the first transparent conductive layer (12), and are arranged side by side while being spaced apart in the first direction. For example, when the shape of the first transparent conductive layer (12) is a square, the first lower electrode (13a) and the second lower electrode (13b) can be arranged near opposite corners, as shown in Fig. 1. Being arranged side by side means that the shapes of the lower electrodes (13, 13a, 13b) can be a bar or rod shape, and are arranged in the same or similar direction on the same line.

[0049] The first upper electrode (15a) is formed on the lower surface of the second transparent conductive layer (16). The first upper electrode (15a) can be arranged in any region on the lower surface of the second transparent conductive layer (16). In addition, the first upper electrode (15a) can be arranged in a region corresponding to the region between the first lower electrode (13a) and the second lower electrode (13b) on the lower surface of the second transparent conductive layer (16). For example, the first upper electrode (15a) can be arranged in any region within the region projected in the normal direction to the lower surface of the second transparent conductive layer (16) from the region between the first lower electrode (13a) and the second lower electrode (13b).

[0050] FIG. 2 is a side view schematically illustrating a color-changing heating film according to an embodiment of the present invention.

[0051] Referring to FIG. 2, the color-changing heating film according to an embodiment of the present invention may include a second upper electrode (15b) on the lower surface of the second transparent conductive layer (16). The second upper electrode (15b) may be disposed in any region on the lower surface of the second transparent conductive layer (16). In addition, the second upper electrode (15b) may be disposed in a region corresponding to the region between the first lower electrode (13a) and the second lower electrode (13b). The second upper electrode (15b) may be disposed parallel to and spaced apart from the first upper electrode (15a) in a second direction different from the first direction.

[0052] The first transparent substrate (11) and the second transparent substrate (17) can be formed of a transparent material having a high transmittance, for example, a transmittance of 85% or more. The transparent material forming the first transparent substrate (11) and the second transparent substrate (17) can include not only flexible glass having a thickness of 50 μm or less, but also PET (Polyethylene Terephthalate), transparent PI (Polyimide), COP (Cyclic Olefin Polymer), TAC (Cellulose triacetate), ETFE (Ethylene Tetrafluoroethylene), PP (Polypropylene), PO (Polyolefin), PVC (Polyvinyl Chloride), or TPU (Thermoplastic Polyurethane) made of plastic.

[0053] The first transparent conductive layer (12) and the second transparent conductive layer (16) may be formed of a transparent conductive material. The transparent conductive material included in the first transparent conductive layer (12) or the second transparent conductive layer (16) may include one or more of ITO, ITO:W, PEDOT (Poly(3,4-ethylenedioxythiophene)), PEDOT:PSS (Polystyrene sulfonate), PEDOT:PANI (Polyaniline), Ti, Ni, Ni-V alloy, Ni-Cr alloy, Cr, Ag, Au, Cu, Zn, Sn, Fe, Zr, Hf, Ta, Mo, Mn, Co, or W. For example, the first transparent conductive layer (12) or the second transparent conductive layer (16) may be formed by mixing two or more materials of ITO, PEDOT, PEDOT:PSS, PEDOT:PANI, Ti, Ni, Cr, Ag, Au, Cu, Zn, Sn, Fe, Zr, Hf, Ta, Mo, Mn, Co or W in a single layer, or may be formed in the form of two or more laminates with each material as a separate layer. The first transparent conductive layer (12) and the second transparent conductive layer (16) may be formed by depositing on the upper and lower surfaces of the first transparent substrate (11) and the second transparent substrate (17) by a deposition device such as sputtering or PECVD, or by wet coating with a conductive polymer material, respectively. In addition, when the first transparent conductive layer (12) or the second transparent conductive layer (16) is formed by including a metal material, it may be formed in the form of a metal mesh or nanowire, or may be formed in a form dispersed on a transparent conductive substrate.

[0054] When the first transparent conductive layer (12) and the second transparent conductive layer (16) are formed by including ITO, the sheet resistance can be 5 to 500Ω / □. In addition, when the first transparent conductive layer (12) and the second transparent conductive layer (16) are formed by including ITO, they can be preferentially grown and formed in the (222) plane. This is advantageous for the patterning process because uniform etching occurs when immersed in an etching solution. When the first transparent conductive layer (12) and the second transparent conductive layer (16) are formed by including ITO, they can have stable crystallinity without changes in sheet resistance and transmittance even at 170°C.

[0055] When the first transparent conductive layer (12) and the second transparent conductive layer (16) are formed by including PEDOT or a metal such as Ti, Ni, Cr, Ag, Au, Cu, Zn, Sn, Fe, Zr, Hf, Ta, Mo, Mn, Co, or W, the transmittance is lower than that of ITO, but the infrared blocking performance is excellent. When the first transparent conductive layer (12) and the second transparent conductive layer (16) are formed by applying PEDOT, a conjugated polymer solution having a pH of 6 to 8 can be used. When the PEDOT layer is thermally cured, phase separation of the layer occurs, and through this, 99% of light up to the mid-infrared region, that is, an infrared wavelength of 1.5 to 25 ㎛, can be blocked. In addition, when the first transparent conductive layer (12) and the second transparent conductive layer (16) are formed by including PSS or PANI dopant in PEDOT, the conductivity is improved, so that it has characteristics such as 5 to 500Ω / □, which is the same as the surface resistance of ITO, and the transmittance characteristics also reach 30 to 84%.

[0056] The color conversion layer (14) changes transparency from transparent to opaque or from opaque to transparent depending on the application of voltage or current. The color conversion layer (14) is a film in which an oxidation / reduction electrochromic material is dissolved in an electrolyte layer, and is broadly classified into four types according to the driving form.

[0057] First, Type I color-conversion films are devices in which a redox electrochromic material is dissolved in an electrolyte layer. The electrochromic material used in these Type I color-conversion films is mostly viologen, and the film's color change is primarily affected by diffusion due to differences in the concentration of chemical species within the electrolyte.

[0058] In contrast, Type III color conversion films are formed by coating the redox electrochromic material as a solid film on the electrode surface, so that it does not dissolve in the electrolyte layer.

[0059] The electrochromic materials of these Type III color conversion films mainly use conductive polymers and metal oxides such as Ti, Ni, Cr, Ag, Au, Cu, Zn, Sn, Fe, Zr, Hf, Ta, Mo, Mn, Co or W, and the operation of the device is mainly affected by the electrochemical reaction due to electron transfer at the electrode surface.

[0060] Type II color conversion film, which is an intermediate form between Type I and III, uses only one of the oxidation / reduction electrochromic materials dissolved in the electrolyte layer, and the other material as a solid film that does not dissolve in the electrolyte on the electrode surface.

[0061] Type IV color conversion film is a type that uses a solid film formed by dispersing electrochromic materials, such as liquid crystals or electronic ink, whose refractive index changes or whose phase changes when electricity is applied, in a polymer matrix or in water.

[0062] The first lower electrode (13a), the second lower electrode (13b), the first upper electrode (15a), and the second upper electrode (15b) can be formed in a long rod shape through a printing or coating process on the upper surface of the first transparent conductive layer (12) or the lower surface of the second transparent conductive layer (16) using a metal such as Ti, Ni, Cr, Ag, Au, Cu, Zn, Sn, Fe, Zr, Hf, Ta, Mo, Mn, Co, or W.

[0063] Referring to FIGS. 1 and 2, when voltage is applied through the first lower electrode (13a) and the second lower electrode (13b), current flows through the first transparent conductive layer (12), and accordingly, the first transparent conductive layer (12) generates heat as a resistor. In addition, when voltage is applied through the first upper electrode (15a) and the second upper electrode (15b), current flows through the second transparent conductive layer (16), and accordingly, the second transparent conductive layer (16) generates heat as a resistor.

[0064] The heat generating function of the first transparent conductive layer (12) or the second transparent conductive layer (16) reduces the temperature difference between the inside and outside, thereby reducing the thermal transmittance and improving the insulation effect. When the color-changing heating film according to the embodiment of the present invention is attached to a window glass measuring 2 m in length and width, the thermal transmittance is increased to 1.6 W / m even with only heat generation of 25°C or less. 2 0.9 W / m in K 2 It can be lowered to K. Here, the amount of energy saved due to the insulation effect is relatively much larger than the electric energy required for the heat generation of the first transparent conductive layer (12) or the second transparent conductive layer (16), resulting in an overall energy saving effect.

[0065] The color conversion layer (14) can change in transparency when an electric field is applied to the first transparent conductive layer (12) and the second transparent conductive layer (16) as both electrodes. Meanwhile, a first lower electrode (13a) and a second lower electrode (13b) can be formed between the color conversion layer (14) and the first transparent conductive layer (12), and a first upper electrode (15a) and a second upper electrode (15b) can be formed between the color conversion layer (14) and the second transparent conductive layer (16). In this case, the color conversion layer (16) can be in direct electrical contact with the electrodes (13a, 13b, 15a, 15b), and when an electric field is applied to the electrodes (13a, 13b, 15a, 15b), the transparency can be changed. The effect of blocking external light or blocking the view can be obtained by changing the transparency of the color conversion layer (14). In addition, when voltage or current is applied to the electrodes (13a, 13b, 15a, 15b), not only the color conversion layer (14) changes color, but also the heating effect of the color-changing heating film occurs. This heating effect of the color-changing heating film increases further as the applied voltage or current increases.

[0066] Meanwhile, the color conversion layer (14) can change its transparency even when an electric field is applied through two electrodes formed on one of the two sides. However, in this case, a non-discoloring region in which the transparency does not change may be formed in some areas of the color conversion layer (14). The formation of such a non-discoloring region causes problems not only in the external light blocking effect of the color conversion layer (14) but also in the aesthetic aspect.

[0067]

[0068] Figures 3a to 3f are drawings showing examples of non-discoloration areas formed in various ways when voltage is applied through electrodes arranged in various ways on one surface of a color conversion layer (14).

[0069] Referring to FIGS. 3a to 3f, it can be seen that there is a tendency for non-discolored areas to be formed primarily at a distance from the two electrodes.

[0070]

[0071] FIG. 4 is a drawing showing an example of a non-discoloration area formed depending on the magnitude of the applied voltage through the electrode arrangement according to an embodiment of the present invention.

[0072] Fig. 4 illustrates a case where the first upper electrode (15a) is connected to the second lower electrode (13b). When a relatively large voltage (V2>V1) is applied to the first lower electrode (13a) and the second lower electrode (13b), it can be confirmed that the non-discoloration area decreases. Referring to Fig. 4, it can be confirmed that the boundary between the discoloration area and the non-discoloration area moves left and right depending on the magnitude of the applied voltage.

[0073]

[0074] FIGS. 5A to 5D are drawings showing examples of non-discoloration regions formed in various ways depending on the wiring shape of electrodes in a color-changing heating film according to an embodiment of the present invention.

[0075] Referring to FIGS. 5a and 5b, it can be confirmed that the non-discoloration region is formed in a portion close to the first lower electrode (13a) or the second lower electrode (13b) connected to the first upper electrode (15a). In addition, referring to FIGS. 5c and 5d, it can be confirmed that when the second upper electrode (15b) is connected to either the first lower electrode (13a) or the second lower electrode (13b), the non-discoloration region is formed in a portion close to the electrode connected to the second upper electrode (15b). According to the embodiments illustrated in FIGS. 5a to 5d, by controlling the voltage applied to the first lower electrode (13a) and the second lower electrode (13b) and the wiring form of the electrodes, the position of formation of the non-discoloring region that acts as a curtain can be adjusted, and the size and direction can be adjusted by moving the boundary between the discoloring region and the non-discoloring region left and right.

[0076]

[0077] FIG. 6a and FIG. 6b are drawings showing examples of non-discoloration regions formed in various ways depending on the wiring shape of electrodes in a color-changing heating film according to an embodiment of the present invention.

[0078] Referring to FIGS. 6a and 6b, a non-discoloration region formed when the first upper electrode (15a) or the second upper electrode (15b) is connected to the first lower electrode (13a) and voltage is applied between the first upper electrode (15a) and the second upper electrode (15b) is illustrated. In this case, it can be confirmed that the non-discoloration region is formed close to the first upper electrode (15a) or the second upper electrode (15b). That is, in the embodiment according to FIGS. 6a and 6b, the formation position of the non-discoloration region is controlled through the connection shape between the upper electrodes (15a, 15b) and the first lower electrode (13a), and the boundary of the non-discoloration region can be moved up and down by controlling the magnitude of the applied voltage, thereby performing a blind function.

[0079] Previously, the only way to implement blind functions from color conversion films was to form electrode patterns across the entire surface to induce transparency changes in each area. That is, transparent electrodes, such as ITO, were patterned onto the color conversion film, and the patterned electrodes were individually used to partially change transparency through voltage control, thereby implementing electronic shading functions, such as blinds. However, this method incurred high costs due to the additional process of patterning, and the formed electrode patterns could also cause problems such as reduced window transparency.

[0080] According to an embodiment of the present invention, a blind electronic shading function can be simply implemented through electrodes formed in some areas such as edges without micro-patterning electrodes on the entire surface of the color conversion layer (14), thereby reducing costs and not compromising the transparency of the window.

[0081]

[0082] The color-changing heating film according to an embodiment of the present invention may include a control unit (not shown) that controls the wiring configuration so as to electrically connect the first upper electrode (15a) to either the first lower electrode (13a) or the second lower electrode (13b). In addition, the control unit may also control the wiring configuration so as to electrically connect the second upper electrode (15b) to either the first lower electrode (13a) or the second lower electrode (13b). The control unit may be formed by being attached to the color-changing heating film in the form of a switching element or chip. In addition, the control unit may be included in an external terminal so as to remotely control the wiring configuration of the color-changing heating film via a wired or wireless communication network.

[0083] The control unit can control the magnitude of the voltage applied between the first lower electrode (13a) and the second lower electrode (13b). In addition, the control unit can also control the magnitude of the voltage applied between the first upper electrode (15a) and the second upper electrode (15b). That is, the control unit can independently apply an AC or DC voltage to each of the first upper electrode (15a), the second upper electrode (15b), the first lower electrode (13a), and the second lower electrode (13b) as individual nodes. This voltage control of the control unit can also be configured to be remotely possible via wired or wireless communication.

[0084]

[0085] Fig. 7 is a drawing showing an actual implementation example of a color-changing heating film according to an embodiment of the present invention.

[0086] Fig. 7 shows an image of a prototype of a color-changing heating film according to Fig. 6a, which is actually implemented. As the applied voltage increases, the boundary of the non-discoloring region moves upward, and it can be confirmed that the entire region becomes more transparent. In Fig. 7, a color-changing heating film that changes color from an opaque state to a transparent state when voltage is applied is exemplified, but the same effect can be confirmed for a color-changing heating film including a color conversion layer that changes color from a transparent state to an opaque state when voltage is applied. As the magnitude of the applied voltage increases, the color-changing heating film acts as a resistor, and the amount of heat generated further increases.

[0087]

[0088] FIGS. 8A and 8B are drawings showing examples of non-discoloration regions formed according to the magnitude of the voltage applied to the electrodes and the wiring shape of the electrodes in a color-changing heating film according to an embodiment of the present invention.

[0089] Referring to Fig. 8a, the first upper electrode (15a) is connected to the second lower electrode (13b). A voltage V4 is applied between the first lower electrode (13a) and the second lower electrode (13b), and at the voltage V4 Due to this, the first transparent conductive layer (12) generates heat. A voltage V3 is applied between the first lower electrode (13a) and the second upper electrode (15b). In this case, a potential difference is also formed between the first upper electrode (15a) and the second upper electrode (15b), and the second transparent conductive layer (16) also generates heat due to the formed potential difference. At this time, when the voltage V3 becomes 90 V or more, a non-discoloration region is formed near the connection area where the first upper electrode (15a) and the second lower electrode (13b) are connected. Since the formed non-discoloration region becomes very small in size as shown in Fig. 8a, it is not easy to confirm it with the naked eye. For example, when V3 is set to 111 V, V4 is set to 47.6 V, the resistance between the first upper electrode (15a) and the second upper electrode (15b) is set to 145 Ω, and the resistance between the first lower electrode (13a) and the second lower electrode (13b) is set to 111 Ω, the non-discoloration region formed is at a level that can be ignored in terms of visibility. In addition, the part where the non-discoloration region is formed is the outermost part of the discoloration heating film, and in actual use, it is near the frame of a window, etc., so it can be ignored even more. Therefore, the aesthetics of the discoloration heating film are not impaired.

[0090] Referring to Fig. 8b, the first upper electrode (15a) is connected to the first lower electrode (13a). A voltage V6 is applied between the first lower electrode (13a) and the second lower electrode (13b), and a voltage V5 is applied between the second lower electrode (13b) and the second upper electrode (15b). Even in this case, when V5 is 90 V or higher, the non-discoloration area is minimized and formed close to the connection area where the first upper electrode (15a) and the first lower electrode (13a) are connected, thereby maximizing the effects of improved transmittance and improved aesthetics.

[0091]

[0092] Meanwhile, when a voltage is applied between one of the upper electrodes (the first upper electrode and the second upper electrode) and one of the lower electrodes (the first lower electrode and the second lower electrode) without a connection between the upper electrodes (15, 15a, 15b) and the lower electrodes (13, 13a, 13b), only the discoloration of the color conversion layer (14) can be induced without causing the first transparent conductive layer (12) and the second transparent conductive layer (16) to generate heat. As a result, the effect of blocking the view can be sufficiently exerted while minimizing the consumption of electric energy required for heat generation.

[0093]

[0094] As described above, the problem of a non-discoloring area being formed by the voltage applied to one side of the color conversion layer (14) can be exploited to not only be used as a curtain or blind for blocking the view, but also the transmittance and aesthetics of the discoloring heating film can be improved by controlling the formation location of the non-discoloring area and minimizing its size through adjustment of the wiring of the electrodes and the size of the voltage.

[0095]

[0096] While specific embodiments of the present invention have been described so far, it is clear that various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the claims set forth below, but also by equivalents thereof.

[0097] Although the present invention has been described with reference to limited embodiments and drawings, it is not limited to the above-described embodiments. Those skilled in the art will appreciate that various modifications and variations are possible based on this disclosure. Therefore, the scope of the present invention should be understood solely by the scope of the claims set forth below, and all equivalent or equivalent modifications thereof are deemed to fall within the scope of the present invention.

Claims

1. In a color-changing heating film including a color-changing layer capable of controlling a color-changing area and a non-color-changing area, A first transparent substrate formed of a transparent material; A first transparent conductive layer formed on the upper portion of the first transparent substrate and made of a transparent conductive material; A color conversion layer formed on the first transparent conductive layer and including a discoloration region whose transparency changes depending on the application of an electric field and a non-discoloration region whose transparency does not change; A second transparent conductive layer formed on top of the color conversion layer and made of a transparent conductive material; A second transparent substrate formed on the upper side of the second transparent conductive layer and made of a transparent material; A first lower electrode and a second lower electrode formed on the upper surface of the first transparent conductive layer and arranged side by side and spaced apart in the first direction; and Including a first upper electrode arranged on the lower surface of the second transparent conductive layer; Electrically connecting the first upper electrode with one of the first lower electrode or the second lower electrode, When an alternating current or direct current voltage is applied between the first lower electrode and the second lower electrode, heat generation of the first transparent conductive layer is induced. A discoloration heating film characterized in that the formation location and area size of the non-discoloration region are controlled by controlling the direction and size of the voltage application.

2. In paragraph 1, A discoloration heating film, characterized in that the non-discoloration region is formed close to one of the first lower electrode or the second lower electrode that is electrically connected to the first upper electrode.

3. In paragraph 1, A color-changing heating film characterized by including a control unit electrically connecting the first upper electrode to one of the first lower electrode or the second lower electrode.

4. In paragraph 1, A control unit that controls the magnitude of the voltage applied between the first lower electrode and the second lower electrode is included, A color-changing heating film characterized in that the area of ​​the non-denatured region decreases as the applied voltage through the control unit increases.

5. In paragraph 4, A discoloration heating film characterized in that when the applied voltage through the control unit increases, the boundary between the discoloration region and the non-discoloration region moves toward one of the first lower electrode or the second lower electrode that is electrically connected to the first upper electrode.

6. In paragraph 1, A color-changing heating film characterized by including a second upper electrode formed on the lower surface of the second transparent conductive layer and arranged parallel to the first upper electrode in a second direction different from the first direction.

7. In paragraph 6, A color-changing heating film characterized by including a control unit electrically connecting one of the first upper electrode or the second upper electrode to one of the first lower electrode or the second lower electrode.

8. In paragraph 6, A color-changing heating film characterized in that the control unit induces heating of the second transparent conductive layer by applying an alternating current or direct current voltage between the electrode not connected to the first upper electrode among the first lower electrode or the second lower electrode and the second upper electrode.

9. In paragraph 8, A color-changing heating film characterized in that, when a voltage applied between the first lower electrode or the second lower electrode, which is not connected to the first upper electrode, and the second upper electrode is 90 V or more, the non-discoloring region is formed in proximity to a connection area where the first upper electrode is electrically connected to one of the first lower electrode or the second lower electrode.

10. In any one of paragraphs 1 to 9, An electronic sunshade having a blind curtain function formed by including the above-mentioned discoloration heating film.

11. In a color-changing film including a color-changing layer capable of controlling a color-changing area and a non-color-changing area, A first transparent substrate formed of a transparent material; A first transparent conductive layer formed on the upper portion of the first transparent substrate and made of a transparent conductive material; A color conversion layer formed on the first transparent conductive layer and including a discoloration region whose transparency changes depending on the application of an electric field and a non-discoloration region whose transparency does not change; A second transparent conductive layer formed on top of the color conversion layer and made of a transparent conductive material; A second transparent substrate formed on the upper side of the second transparent conductive layer and made of a transparent material; A first lower electrode and a second lower electrode formed on the upper surface of the first transparent conductive layer and arranged side by side and spaced apart in the first direction; and It includes a first upper electrode and a second upper electrode formed on the lower surface of the second transparent conductive layer and arranged side by side and spaced apart in a second direction different from the first direction; Discoloration of the color conversion layer is induced by applying an alternating current or direct current voltage between one of the first lower electrode or the second lower electrode and the first upper electrode, A discoloration film characterized in that the size and location of formation of the non-discoloration region are controlled by controlling the size of the voltage.

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