Active Radiation Control Window

Abstract

The present invention provides an active radiation control window in which the overall transmittance of visible light is maintained and the overall reflectance of near-infrared light is controlled. Here, the active radiation control window includes an adjustment layer, a filter layer, and a resonant layer. The adjustment layer adjusts the transmittance or absorbance of near-infrared light according to an applied voltage. The filter layer is formed below the adjustment layer and transmits visible light and reflects near-infrared light. The resonant layer is formed between the adjustment layer and the filter layer and is made of a dielectric. When the applied voltage is changed, the overall transmittance of visible light is maintained and the overall reflectance of near-infrared light is controlled.

Description

Technical Field

[0001] The present invention relates to an active radiation control window, and more particularly to an active radiation control window in which the total transmittance of visible light is maintained and the total reflectance of near-infrared light is controlled.

Background Art

[0002] Recently, the development and commercialization of electric vehicles have been active, and electric vehicle manufacturers are investing a lot to increase the driving range of electric vehicles.

[0003] Generally, vehicles are equipped with windows made of transparent materials such as glass. In summer, the inflow of near-infrared rays through the windows increases the internal temperature of the vehicle, and a lot of power must be used for the operation of the cooler, resulting in increased battery consumption. Also, in winter, a lot of power is used for vehicle heating, resulting in increased battery consumption. Such power consumption required for cooling and heating makes it difficult to extend the driving range of electric vehicles.

[0004] On the other hand, smart windows are attracting attention because they can freely adjust the amount of light transmitted and improve energy efficiency. Types of smart windows include discoloration methods (CD, Chromic Display) that reversibly induce color changes depending on changes in external voltage (EC, Electrochromic), light wavelength (PC, Photochromic), and temperature (TC, Thermochromic), suspended particle device (SPD), polymer dispersed liquid crystal technology (PDLC), and the like.

[0005] However, the polarization particle alignment type element technology (SPD), polymer dispersed liquid crystal technology (PDLC), and color change method (CD) based on voltage (EC) change have limitations in that the transparency of visible light is controlled and they are not suitable for application to vehicle windows. When applied to windows, there are limitations in that the total amount of energy incident on the system is similar by controlling light transmission and absorption. And the color change method (CD) based on temperature (TC) change has the problem of requiring a high activation temperature.

[0006] Such problems also occur when smart windows are applied not only to vehicles but also to buildings.

[0007] As a prior art document related to this, there is Korean Patent Publication No. 2016-0117326 (published on October 10, 2016).

Summary of the Invention

[0008] The present invention has been made to solve the above problems, and its object is to provide an active radiation control window in which the overall transmittance of visible light is maintained and the overall reflectance of near-infrared light is controlled.

Means for Solving the Problems

[0009] To achieve the above object, an embodiment of the present invention includes an adjustment layer in which the transmittance or absorbance of near-infrared light is adjusted by an applied voltage, a filter layer formed below the adjustment layer that transmits visible light and reflects near-infrared light, and a resonance layer formed between the adjustment layer and the filter layer and made of a dielectric. When the applied voltage changes, the overall transmittance of visible light is maintained and the overall reflectance of near-infrared light is controlled.

[0010] When the first voltage is applied, the transmittance of near-infrared light of the adjustment layer is made higher than the transmittance of near-infrared light when a second voltage different from the first voltage is applied, and the absorbance of near-infrared light when the first voltage is applied is made lower than the absorbance of near-infrared light when the second voltage is applied. When the first voltage and the second voltage are applied, the transmittance and absorbance of visible light are maintained constant.

[0011] The adjustment layer is formed of a plurality of graphene layers stacked thereon.

[0012] The filter layer has a dielectric layer and a metal layer arranged alternately.

[0013] Each of the dielectric layers is formed of a light-transmissive material with respect to visible light and near-infrared light.

[0014] The filter layer is configured by laminating at least one or more dielectric layers.

[0015] Each of the dielectric layers has a dielectric material with a relatively high refractive index and a dielectric material with a relatively low refractive index laminated alternately.

[0016] The resonance layer amplifies the difference between the total reflectance of the near-infrared light when the first voltage is applied and the total reflectance of the near-infrared light when the second voltage is applied, and amplifies the difference between the total absorbance of the near-infrared light when the second voltage is applied and the total absorbance of the near-infrared light when the first voltage is applied.

[0017] When the first voltage and the second voltage are applied, the resonance layer reduces the total absorbance of the visible light.

[0018] The resonance layer is formed with a certain thickness.

[0019] Furthermore, a protective layer formed of a light-transmissive material is included on the upper portion of the adjustment layer.

[0020] The protective layer includes a transparent electrode, and the transparent electrode increases the total transmittance of the visible light due to an anti-reflection effect.

[0021] Furthermore, an insulating layer is formed between the protective layer and the adjustment layer, and the insulating layer electrically insulates the protective layer and the adjustment layer.

[0022] Furthermore, an electrode layer is disposed on the upper side of the resonance layer and the side portion of the adjustment layer, and a power source for applying an electric field to the resonance layer is supplied to the electrode layer.

[0023] Furthermore, an adhesive layer having a predetermined adhesive force is disposed on the upper part of the adjustment layer.

[0024] The filter layer is formed on a substrate, and furthermore, an adhesive layer having a predetermined adhesive force is disposed under the substrate.

Advantages of the Invention

[0025] According to the present invention, when the applied voltage changes, the total transmittance of visible light is maintained, and the total reflectance of near-infrared light can be controlled. Therefore, in summer, a high voltage is applied to the adjustment layer to reduce the absorbance of near-infrared light in the adjustment layer, and at the same time, the transmittance of the adjustment layer is increased so that the transmitted near-infrared light is reflected by the filter layer, thereby realizing a high reflection effect that prevents near-infrared light from flowing into the interior. Also, in winter, a low voltage is applied to the adjustment layer to increase the absorbance of near-infrared light in the adjustment layer, and this is amplified by the resonance layer so that the absorbed near-infrared light can flow well into the interior in the form of heat. By utilizing this, it is possible to reduce the battery consumption for vehicle cooling in summer or vehicle heating in winter, and thereby contribute to extending the driving distance of the vehicle.

Brief Description of the Drawings

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[0027] Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention can be embodied in various different forms and is not limited to the embodiments described herein. Also, in order to clearly describe the present invention in the drawings, parts not related to the description are omitted, and throughout the specification, similar parts are denoted by similar reference numerals.

[0028] Throughout the specification, if a part is "connected (connected, contacted, coupled)" to another part, this includes not only the case where it is "directly connected", but also the case where it is "indirectly connected" with another member interposed therebetween. Also, if a part "includes" a certain component, this means that, unless otherwise stated to the contrary, it does not exclude other components, but can also include other components.

[0029] The terms used in this specification are merely used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions as well, unless the context clearly indicates otherwise. In this specification, terms such as "including" or "having" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and it should be understood that the presence or addition possibility of one or more other features, numbers, steps, operations, components, parts, or combinations thereof is not precluded in advance.

[0030] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0031] FIG. 1 is a cross-sectional view showing an active radiation control window according to a first embodiment of the present invention.

[0032] As shown in FIG. 1, the active radiation control window 1 includes an adjustment layer 100, a filter layer 200, and a resonance layer 300.

[0033] First, the filter layer 200 is provided on the substrate 400. A resonance layer 300 is provided above the filter layer 200, and an adjustment layer 100 is provided above the resonance layer 300.

[0034] When the active radiation control window 1 is used for a vehicle window, the substrate 400 is the vehicle glass. When the active radiation control window is used for a building window, the substrate 400 is the building window glass. However, the substrate 400 is not limited to glass and may be other components of a vehicle or a building.

[0035] For example, the substrate 400 is also a film attached to a vehicle window or a building window and is formed of PET (polyethylene terephthalate), PE (Polyethylene), etc.

[0036] In contrast, the substrate 400 forms a base for supporting the layers formed thereon, and the active radiation control window 1 including the substrate 400 is attached onto other structures such as vehicle glass and building windows.

[0037] The adjustment layer 100 is exposed to the outside 10 on the outermost side of the active radiation control window 1. Therefore, the visible light 30 and the near-infrared light 40 of the outside 10 first flow into the adjustment layer 100.

[0038] The adjustment layer 100 is made of a substance whose optical properties can be electrically adjusted. Desirably, the adjustment layer 100 is formed of a plurality of graphene layers 110, and the graphene layers 110 are provided in a stacked manner.

[0039] The adjustment layer 100 adjusts the transmittance or absorbance of the near-infrared light 40 according to the applied voltage.

[0040] Figures 2a to 2c are graphs for explaining the performance of the adjustment layer of the active radiation control window in FIG. 1.

[0041] As shown in Fig. 2a, when a first voltage of 0.9 eV is applied to the adjustment layer, visible light (350 - 700 nm) exhibits a low reflectivity, while the reflectivity of near-infrared light (700 nm - 2.5 μm) increases.

[0042] On the other hand, when a second voltage of 0.1 eV is applied to the adjustment layer, it can be seen that the reflectivities of visible light and near-infrared light are low and the reflectivity is maintained constant.

[0043] Also, as shown in Fig. 2b, when a second voltage of 0.1 eV is applied to the adjustment layer, the transmissivities of visible light and near-infrared light are constant. However, when a first voltage of 0.9 eV is applied to the adjustment layer, the transmissivity of near-infrared light increases rapidly. It can be seen that by appropriately applying a voltage between the first voltage and the second voltage, the transmissivity of near-infrared light can be adjusted by about 30%.

[0044] Moreover, as shown in Fig. 2c, when a second voltage of 0.1 eV is applied to the adjustment layer, the absorptivities of visible light and near-infrared light are constant. However, when a first voltage of 0.9 eV is applied to the adjustment layer, the absorptivity of near-infrared light decreases rapidly. It can be seen that by appropriately applying a voltage between the first voltage and the second voltage, the absorptivity of near-infrared light can be adjusted by about 30%.

[0045] That is, the adjustment layer 100 can be made such that the transmissivity of near-infrared light when the first voltage is applied is higher than the transmissivity of near-infrared light when the second voltage is applied, or the absorptivity of near-infrared light when the first voltage is applied is lower than the absorptivity of near-infrared light when the second voltage is applied, and when the first voltage and the second voltage are applied, the transmissivity and absorptivity of visible light are maintained constant.

[0046] Thus, when the Fermi-Level of the adjustment layer 100 is adjusted to 0.1 - 0.9 eV, the visible light characteristics can be maintained while the near-infrared light characteristics can be significantly changed. In other words, when the applied voltage changes, the overall transmittance of visible light is maintained, and the overall reflectance of near-infrared light can be controlled.

[0047] Therefore, in summer, a high voltage is applied to the adjustment layer to reduce the absorbance of near-infrared light in the adjustment layer and simultaneously increase the transmittance of the adjustment layer so that the transmitted near-infrared light is reflected from the filter layer 200, thereby realizing a high reflection effect to prevent near-infrared light from flowing into the interior 20.

[0048] Also, in winter, a low voltage is applied to the adjustment layer to reduce the near-infrared transmittance of the adjustment layer and increase the absorbance so that the absorbed near-infrared light can flow well into the interior 20 in the form of heat, amplified by the resonance layer 300 to be described later. By utilizing this, the battery consumption for vehicle cooling in summer or vehicle heating in winter can be reduced, thereby contributing to an extended driving range of the vehicle.

[0049] On the other hand, the filter layer 200 is formed below the adjustment layer 100, transmitting visible light and reflecting near-infrared light.

[0050] Figure 3 is a cross-sectional view showing an example of the filter layer of the active radiation control window of Figure 1. Figures 4a and 4b are graphs for explaining the performance of the filter layer of the active radiation control window of Figure 1.

[0051] First, as shown in Figure 3, the filter layer 200 has a dielectric layer 210 and a metal layer 220, and the dielectric layer 210 and the metal layer 220 are arranged alternately.

[0052] The filter layer 200 has a plurality of dielectric layers 210 and metal layers 220, and is not limited thereto, such as in a form where the dielectric layer 210 / metal layer 220 repeats, or in a form where the dielectric layer 210 / metal layer 220 / dielectric layer 210 is arranged with dielectric layers 210 disposed at the top and bottom of the filter layer 200.

[0053] The dielectric layer 210 is made of a light-transmissive material for visible light and near-infrared light, and is, for example, ITO (Indium Tin Oxide). Also, silver (Ag) is used as the metal layer 220.

[0054] As shown in FIG. 4a, when the filter layer consists only of 5 nm thick silver (Ag), the reflectance of visible light is low, but the reflectance of near-infrared light is also low, within 0.7. Also, when the filter layer consists only of 20 nm of silver (Ag), although the reflectance of near-infrared light exceeds 0.9, there is a problem that the reflectance of visible light is also high.

[0055] However, when the filter layer 200 is in a form where the dielectric layer 210 made of ITO and the metal layer 220 made of 20 nm of silver (Ag) are alternately arranged, as in this embodiment, it can be seen that the reflectance of visible light is low, but the reflectance of near-infrared light increases rapidly. In particular, as in this embodiment, it can be seen that the filter layer exhibits a visible light reflectance similar to that of a filter layer consisting only of 5 nm thick silver (Ag), and a near-infrared light reflectance similar to that of a filter layer consisting only of 20 nm of silver (Ag).

[0056] Also, as shown in FIG. 4b, when the filter layer consists only of 5 nm thick silver (Ag), the transmittance of visible light is high, but the transmittance of near-infrared light is also 0.2 or more. And when the filter layer consists only of 20 nm of silver (Ag), although the transmittance of near-infrared light is low, there is a problem that the transmittance of visible light is also low, at 0.7 or less.

[0057] However, when, as in the present embodiment, the filter layer 200 is in a form in which the dielectric layer 210 made of ITO and the metal layer 220 made of 20 nm of silver (Ag) are alternately arranged, it can be seen that the transmittance of visible light is high and the transmittance of near-infrared light decreases rapidly. In particular, as in the present embodiment, it can be seen that the filter layer exhibits the same visible light transmittance as a filter layer composed only of 5 nm thick silver (Ag), and the same near-infrared light transmittance as a filter layer composed only of 20 nm of silver (Ag).

[0058] When the filter layer 200 is in a form in which the dielectric layer 210 and the metal layer 220 are alternately arranged, the gradient at the boundary wavelength of visible light and near-infrared light can be made even larger. In other words, since the boundary between visible light and near-infrared light can change abruptly, the visible light transmittance and the near-infrared light reflectance can be effectively increased.

[0059] FIG. 5 is a cross-sectional view showing another example of the filter layer of the active radiation control window of FIG. 1. FIGS. 6A to 6C are graphs for explaining the performance of the filter layer of the active radiation energy window of FIG. 5.

[0060] In contrast, as in FIG. 5, the filter layer 200 can also be formed by laminating a plurality of dielectric layers 211, 212, 213.

[0061] In this case, at least one layer (for example, 211) of the plurality of dielectric layers 211, 212, 213 has a structure in which a dielectric material having a relatively high refractive index and a dielectric material having a relatively low refractive index are alternately laminated, and is designed to have a relatively high reflectance in a specific near-infrared region.

[0062] That is, the dielectric material with a relatively high refractive index and the dielectric material with a relatively low refractive index that constitute the at least one dielectric layer 211 each have a thickness corresponding to a quarter wavelength (quarter-wave stack) so as to have a thickness corresponding to a quarter wavelength at a predetermined wavelength (first wavelength, for example, λ = 860 nm) in the near-infrared region close to the visible light region. In this case, a high reflectance is exhibited at the predetermined wavelength.

[0063] Similarly, among the plurality of dielectric layers 211, 212, 213, the other dielectric layers (for example, 212 and 213) excluding the at least one layer (for example, 211) are designed to have a high reflectance at other predetermined wavelengths (second wavelength and third wavelength, for example, λ> 1000 nm) in the near-infrared region. Dielectric materials having three or more refractive indices are laminated on each layer, and a low reflectance can be realized in the visible light region.

[0064] In this case, the number of the dielectric layers to be laminated is sufficient if it is two or more, and the number is not limited.

[0065] As described above, when the dielectric layers are laminated on each other to form the filter layer 200, a sharp reflectance in the infrared can be realized.

[0066] As shown in FIGS. 6a to 6c, unlike the filter layer composed of one dielectric layer as shown in FIG. 6a, in the case of the filter layer in which two dielectric layers are laminated as shown in FIG. 6b, or the filter layer in which three dielectric layers are laminated as shown in FIG. 6c, a high reflectance can be realized in a relatively wide infrared region.

[0067] On the other hand, the resonance layer 300 is formed between the adjustment layer 100 and the filter layer 200.

[0068] The resonance layer 300 is formed with a certain thickness and is formed of a dielectric. As the dielectric forming the resonance layer 300, silicon dioxide (SiO2), PMMA (polymethylmethacrylate), ion gel, etc. can be used.

[0069] When the applied voltage changes, the resonance layer 300 amplifies the difference in the total reflectance of near-infrared light and amplifies the difference in the total absorbance of near-infrared light.

[0070] Figures 7a to 7c are graphs showing the performance of the active radiation control window of FIG. 1 without a resonance layer.

[0071] If the active radiation control window 1 according to the present embodiment does not include a resonance layer, it is difficult to sufficiently obtain the graphene modulation effect between the adjustment layer 100 and the filter layer 200.

[0072] Therefore, as shown in FIG. 7a, the total reflectance of near-infrared light when the first voltage (0.9 eV) is applied is about 70%, and the total reflectance of near-infrared light when the second voltage (0.1 eV) is applied is about 59%, and the difference is about 11%, which is not large.

[0073] Also, as shown in FIG. 7b, it can be seen that there is almost no difference between the total transmittance of near-infrared light when the first voltage (0.9 eV) is applied and the total transmittance of near-infrared light when the second voltage (0.1 eV) is applied.

[0074] Also, as shown in FIG. 7c, the total absorbance of near-infrared light when the first voltage (0.9 eV) is applied is about 20%, and the total absorbance of near-infrared light when the second voltage (0.1 eV) is applied is about 6%, and the difference is about 14%, which is not large. Overall, it can be seen that only about 4% of the total solar energy can be controlled.

[0075] Figures 8a to 8c are graphs for explaining the performance by the resonance layer in the active radiation control window of FIG. 1.

[0076] When the active radiation control window 1 according to this embodiment includes a resonance layer, as shown in FIG. 8a, the total reflectance of near-infrared light when a first voltage (0.9 eV) is applied is 58%, and the total reflectance of near-infrared light when a second voltage (0.1 eV) is applied is 17%. The difference is 41%, indicating that it can be amplified.

[0077] Also, as shown in FIG. 8b, it can be seen that the difference between the total transmittance of near-infrared light when a first voltage (0.9 eV) is applied and the total transmittance of near-infrared light when a second voltage (0.1 eV) is applied is further amplified when compared with FIG. 7b.

[0078] Furthermore, as shown in FIG. 8c, the total absorbance of near-infrared light when a first voltage (0.9 eV) is applied is approximately 56%, and the total absorbance of near-infrared light when a second voltage (0.1 eV) is applied is approximately 9%. The difference is approximately 47%, indicating that it can be amplified. Overall, it can be seen that control of about 22% of the total solar energy is possible.

[0079] In this way, when the resonance layer 300 is provided, a sufficient graphene modulation effect can be obtained between the adjustment layer 100 and the filter layer 200.

[0080] Moreover, the resonance layer 300 can amplify the difference between the total reflectance of near-infrared light when a first voltage is applied and the total reflectance of near-infrared light when a second voltage is applied, and can amplify the difference between the total absorbance of near-infrared light when a second voltage is applied and the total absorbance of near-infrared light when a first voltage is applied.

[0081] In addition, when the resonance layer 300 is provided, due to the multiple reflection effect between the adjustment layer 100 and the filter layer 200, the visible light absorbance decreases. Therefore, when the first voltage and the second voltage are applied, the resonance layer 300 can reduce the overall absorbance of visible light (see Fig. 8c). Utilizing this, in winter, the second voltage (0.1 eV) can be applied to greatly reduce the reflectance of near-infrared light and greatly increase the absorbance of near-infrared light, thereby reducing the battery consumption due to heating.

[0082] Fig. 9 is a cross-sectional view showing the active radiation control window according to the second embodiment of the present invention.

[0083] The active radiation control window 2 in this embodiment is the same as the active radiation control window 1 described in Fig. 1 except that it further includes a protective layer. Therefore, the same reference numerals are assigned to the same components, and duplicate descriptions are omitted.

[0084] That is, as shown in Fig. 9, the active radiation control window 2 according to this embodiment further includes a protective layer 500.

[0085] The protective layer 500 is provided on the upper part of the adjustment layer 100 and is made of a light-transmissive material.

[0086] The protective layer 500 functions to cover and protect the adjustment layer 100, the resonance layer 300, and the filter layer 200 located below on the upper part of the adjustment layer 100, and includes a light-transmissive material so that the light provided from the outside 10 can pass through as it is.

[0087] On the other hand, the protective layer 500 is, for example, a transparent electrode. That is, when a voltage is applied to the filter layer 200 and the protective layer 500, an electric field is formed in the resonance layer 300, and the adjustment layer 100 is modulated.

[0088] Thus, the protective layer 500, as a transparent electrode, prevents visible light from being reflected (Antireflection), and due to such an antireflection effect, the overall transmittance of visible light will increase.

[0089] When the protective layer 500 is a transparent electrode, the transparent electrode can be formed in other structures in addition to the structure shown in FIG. 9. An explanation of this is as follows.

[0090] FIG. 10 is a cross-sectional view showing another example of the active radiation control window of FIG. 9. FIGS. 11a and 11b are plan views showing the active radiation control window of FIG. 10. FIG. 12 is a cross-sectional view showing still another example of the active radiation control window of FIG. 9. FIGS. 13a to 13c are plan views showing the active radiation control window of FIG. 12.

[0091] First, as shown in FIG. 10, in the active radiation control window 3, the electrode layer 500a is disposed above the resonance layer 300 and on the side of the adjustment layer 100.

[0092] The electrode layer 500a is transparent to visible light and near-infrared light and can also be formed of graphene.

[0093] A power source for applying an electric field to the resonance layer 300 is supplied to the electrode layer 500a.

[0094] Also, as shown in FIG. 11a, the electrode layer 500a is formed separately from the adjustment layer 100 and is formed along one side frame at the upper part of the resonance layer 300.

[0095] In contrast, as shown in FIG. 11b, the adjustment layer 100 is formed to have a groove portion 120, and the electrode layer 500a is formed to have a protruding portion 510 sandwiched between the groove portions 120.

[0096] On the other hand, when the electrode layer 500a is not graphene but a transparent electrode made of other materials, an electrode layer 500b is further provided on the upper part of the adjustment layer 100 as in the active radiation control window 4 in FIG. 12.

[0097] The electrode layer 500b provided on the upper part of the adjustment layer 100 is formed in a form provided along the upper one - side frame of the adjustment layer 100 (see Fig. 13a), or in a form having a protruding extension part 520 formed to cover a part of the upper part of the adjustment layer 100 (see Fig. 13b), or in a form formed along the upper frame of the adjustment layer 100 (see Fig. 13c).

[0098] In this case, the electrode layers 500a and 500b contain metal, but depending on the embodiment, they can also be composed of electrodes made of a transparent material.

[0099] Fig. 14 is a cross - sectional view showing an active radiation control window according to the third embodiment of the present invention.

[0100] The active radiation control window 5 in this embodiment further includes an insulating layer 600, and other configurations are the same as those described in Fig. 9.

[0101] That is, as shown in Fig. 14, the active radiation control window 5 according to this embodiment further includes an insulating layer 600.

[0102] The insulating layer 600 is formed between the protective layer 500 and the adjustment layer 100 to electrically insulate the protective layer 500 and the adjustment layer 100. The insulating layer 600 is formed of a dielectric such as, for example, an ion gel.

[0103] The protective layer 500 is a transparent electrode as described above, and in this case, it serves as the opposite electrode of the insulating layer 600. Thus, when a voltage is applied to the adjustment layer 100 and the protective layer 500, an electric field is formed in the insulating layer 600, and the adjustment layer 100 is modulated.

[0104] On the other hand, also in the active radiation control window 5 according to this embodiment, as described in Figs. 10 to 13c, the adjustment layer 100 and the electrode layer 500a are simultaneously formed between the resonance layer 300 and the insulating layer 600. Further, the electrode layer 500b is also further formed between the resonance layer 300 and the insulating layer 600.

[0105] That is, as described with reference to FIGS. 10 to 13c, the adjustment layer 100 and the electrode layer 500a are formed at a predetermined distance on the upper surface of the resonance layer 300, and the insulating layer 600 is formed on the upper surfaces of the adjustment layer 100 and the electrode layer 500a.

[0106] Furthermore, as described with reference to FIG. 12, the electrode layer 500b may be further formed, and the insulating layer 600 may also be formed on the upper surfaces of the adjustment layer 100 and the electrode layers 500a and 500b.

[0107] FIGS. 15a and 15b are cross-sectional views showing an active radiation control window according to a fourth embodiment of the present invention.

[0108] First, as shown in FIG. 15a, the active radiation control window 6 in the present embodiment further includes an adhesive layer 700 formed on the upper part of the adjustment layer 100.

[0109] The adhesive layer 700 contains a substance having a predetermined adhesive force, whereby the active radiation control window 6 is attached to an external structure such as a window. Here, the upper surface of the adhesive layer 700 is formed to have a predetermined adhesive force, and the upper surface of the adhesive layer 700 is attached to the external structure.

[0110] On the other hand, in FIG. 15a, an example is shown in which the adhesive layer 700 is attached to the upper part of the adjustment layer 100 that forms the uppermost layer of the active radiation control window 1 in FIG. 1. However, not only the upper parts of the protective layer 500 or the electrode layers 500a and 500b that form the uppermost layers of the active radiation control windows 2, 3, and 4 described with reference to FIGS. 9 to 12, but also the upper part of the protective layer 500 that forms the uppermost layer of the active radiation control window 5 described with reference to FIG. 14 can be formed.

[0111] In contrast, as shown in FIG. 15b, the active radiation control window 7 in the present embodiment further includes an adhesive layer 700 formed under the substrate 400.

[0112] The adhesive layer 700 contains a substance having a predetermined adhesive force, whereby the active radiation control window 6 is attached onto an external structure such as a window as described above. Here, the lower surface of the adhesive layer 700 is formed to have a predetermined adhesive force, and the lower surface of the adhesive layer 700 is attached onto the external structure.

[0113] According to the embodiment described above, when the applied voltage changes, the overall transmittance of visible light is maintained, and the overall reflectance of near-infrared light is controlled. Therefore, in summer, a high voltage is applied to the adjustment layer to reduce the absorbance of near-infrared light in the adjustment layer, and at the same time, the transmittance of the adjustment layer is increased so that the transmitted near-infrared light is reflected by the filter layer, thereby realizing a high reflection effect that prevents near-infrared light from flowing into the interior. Also, in winter, a low voltage is applied to the adjustment layer to increase the absorbance of near-infrared light in the adjustment layer, and this is amplified by the resonance layer so that the absorbed near-infrared light can flow well into the interior in the form of heat. By making use of this, it is possible to reduce the battery consumption for vehicle air conditioning in summer or vehicle heating in winter, and thereby contribute to extending the driving distance of the vehicle.

[0114] The above description of the present invention is for illustrative purposes, and those with ordinary knowledge in the technical field to which the present invention pertains will understand that it can be easily deformed into other specific forms without changing the technical idea and essential features of the present invention. Therefore, it should be understood that the embodiments described above are illustrative in all aspects and not restrictive. For example, each component described as a single type can also be implemented dispersedly, and similarly, the components described as being dispersed can also be implemented in a combined form. The scope of the present invention is indicated by the claims described below, and it should be analyzed that all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

Explanation of Reference Numerals

[0115] 1, 2, 3, 4, 5, 6, 7: Active radiation control window 100: Adjustment layer 110: Graphene layer 200: Filter layer 210: Dielectric layer 220: Metal layer 300: Resonance layer 400: Substrate 500: Protection layer 500a, 500b: Electrode layer 600: Insulating layer 700: Adhesive layer

Claims

1. An adjustment layer in which the transmittance or absorbance of near-infrared light is adjusted by an applied voltage; A filter layer formed below the adjustment layer, which transmits visible light and reflects near-infrared light; A resonance layer formed between the adjustment layer and the filter layer and made of a dielectric; When the applied voltage changes, the overall transmittance of visible light is maintained and the overall reflectance of near-infrared light is controlled; The resonance layer amplifies the difference between the overall reflectance of the near-infrared light when the first voltage is applied and the overall reflectance of the near-infrared light when the second voltage is applied; An active radiation control window characterized by amplifying the difference between the overall absorbance of the near-infrared light when the second voltage is applied and the overall absorbance of the near-infrared light when the first voltage is applied.

2. The adjustment layer is configured such that the transmittance of near-infrared light when the first voltage is applied is higher than the transmittance of near-infrared light when a second voltage different from the first voltage is applied; is configured such that the absorbance of near-infrared light when the first voltage is applied is lower than the absorbance of near-infrared light when the second voltage is applied; The active radiation control window according to claim 1, characterized in that when the first voltage and the second voltage are applied, the transmittance and absorbance of visible light are maintained constant.

3. The active radiation control window according to claim 2, characterized in that the adjustment layer is formed of a plurality of stacked graphene layers.

4. The active radiation control window according to claim 1, characterized in that the filter layer has dielectric layers and metal layers arranged alternately.

5. The active radiation control window according to claim 4, characterized in that the dielectric layer is formed of a light-transmissive material for visible light and near-infrared light.

6. The active radiation control window according to claim 1, characterized in that the filter layer is composed of at least one or more stacked dielectric layers.

7. The active radiation control window according to claim 6, characterized in that each of the dielectric layers has a dielectric material with a relatively high refractive index and a dielectric material with a relatively low refractive index stacked alternately.

8. The active radiation control window according to claim 1, characterized in that the resonance layer reduces the overall absorbance of visible light when the first voltage and the second voltage are applied.

9. The active radiation control window according to claim 1, wherein the resonance layer is formed with a constant thickness.

10. The active radiation control window according to claim 1, further comprising a protective layer formed of a light-transmissive material on the upper portion of the adjustment layer.

11. The protective layer includes a transparent electrode, The active radiation control window according to claim 10, wherein the transparent electrode increases the total transmittance of the visible light due to an anti-reflection effect.

12. The active radiation control window according to claim 10, further comprising an insulating layer formed between the protective layer and the adjustment layer to electrically insulate the protective layer and the adjustment layer.

13. The active radiation control window according to claim 1, further comprising an electrode layer disposed on the upper side of the resonance layer and the side portion of the adjustment layer, to which a power source for applying an electric field to the resonance layer is supplied.

14. The active radiation control window according to claim 1, further comprising an adhesive layer disposed on the upper portion of the adjustment layer and having a predetermined adhesive force.

15. The filter layer is formed on a substrate, The active radiation control window according to claim 1, further comprising an adhesive layer disposed under the substrate and having a predetermined adhesive force.

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