Light control sheet and method for manufacturing light control sheet

Abstract

The present application aims to improve the design of a light control sheet. The light control sheet of the present application has a first transparent electrode layer, a second transparent electrode layer, a light control layer, a first transparent support layer having a support surface that supports the first transparent electrode layer, and a second transparent support layer. The first transparent electrode layer includes a drive electrode element (30) and a floating electrode element (31). The drive electrode element (30) and the floating electrode element (31) are different layered bodies arranged along the support surface and are electrically insulated from each other by a groove extending along the support surface. The drive electrode element (30) has a narrow portion (30A) sandwiched by a non-drive region (21) including the groove and the floating electrode element (31). The width of the narrow portion (30A) is 1 mm or more.

Description

Technical Field

[0001] This invention relates to a dimming sheet with variable light transmittance and a method for manufacturing the dimming sheet. Background Technology

[0002] A dimming sheet includes a dimming layer comprising a liquid crystal composition and a pair of transparent electrode layers sandwiching the dimming layer. A driving voltage is applied between the pair of transparent electrode layers. The orientation state of the liquid crystal molecules changes according to the potential difference between the transparent electrode layers, thereby changing the transmittance of the dimming sheet. For example, when the long axis direction of the liquid crystal molecules is along the thickness direction of the dimming layer, the dimming sheet is colorless and transparent, and the transmittance of the dimming sheet is high. On the other hand, when the long axis direction of the liquid crystal molecules intersects the thickness direction of the dimming layer, light is scattered within the dimming layer, and the transmittance of the dimming sheet is low (for example, see Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-45135 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] Dimming sheets are attached to components that divide space, such as building windows, partitions, or vehicle windows, and are used as part of such components. In recent years, to increase the added value of dimming sheets, attention has been focused on their aesthetic design. Improved aesthetic design can significantly expand the application range of dimming sheets and create new demands for dimming solutions. Therefore, there is a need to develop dimming sheets with enhanced aesthetic design.

[0008] Methods for solving problems

[0009] One embodiment provides a dimming sheet. The dimming sheet includes: a first transparent electrode layer; a second transparent electrode layer; a dimming layer located between the first and second transparent electrode layers; a first transparent support layer located opposite to the dimming layer relative to the first transparent electrode layer and having a support surface supporting the first transparent electrode layer; and a second transparent support layer located opposite to the dimming layer relative to the second transparent electrode layer. The first transparent electrode layer includes a first electrode element and a second electrode element, the first and second electrode elements being different layered bodies arranged along the support surface and electrically insulated from each other by a groove extending along the support surface. The first electrode element has a narrow portion sandwiched by the groove, the width of the narrow portion being 1 mm or more.

[0010] In another embodiment, a dimming sheet is provided. The dimming sheet comprises: a first transparent electrode layer; a second transparent electrode layer; a dimming layer located between the first and second transparent electrode layers; a first transparent support layer located opposite to the dimming layer relative to the first transparent electrode layer and having a support surface supporting the first transparent electrode layer; and a second transparent support layer located opposite to the dimming layer relative to the second transparent electrode layer. The first transparent electrode layer includes a first electrode element and a second electrode element, the first and second electrode elements being different layered bodies arranged along the support surface and electrically insulated from each other by a groove extending along the support surface. The groove has a curved portion, and the first electrode element has a narrow portion located inside the curved portion, the width of which is 1 mm or more.

[0011] In another embodiment, a dimming sheet is provided. The dimming sheet comprises: a first transparent electrode layer; a second transparent electrode layer; a dimming layer located between the first and second transparent electrode layers; a first transparent support layer located opposite to the dimming layer relative to the first transparent electrode layer and having a support surface supporting the first transparent electrode layer; and a second transparent support layer located opposite to the dimming layer relative to the second transparent electrode layer. The first transparent electrode layer includes a first electrode element and a second electrode element, the first and second electrode elements being different layered bodies arranged along the support surface, and each electrode element being electrically insulated from other electrode elements by grooves extending along the support surface. The width of the narrow portion sandwiched between the groove dividing one of the second electrode elements and the groove dividing other of the second electrode elements is 1 mm or more.

[0012] Another method for manufacturing a dimming sheet is provided. The method includes: a groove forming step, in which a groove is formed in a first film including a first transparent support layer and a first transparent electrode layer supported on the first transparent support layer, at least penetrating the first transparent electrode layer, and a first electrode element and a second electrode element electrically insulated from each other by the groove are formed within the first transparent electrode layer; and a dimming layer disposing of a dimming layer between the first film and a second film including a second transparent support layer and a second transparent electrode layer supported on the second transparent support layer, wherein in the groove forming step, the width of the narrow portion disposed on the first electrode element and sandwiched by the groove is 1 mm or more.

[0013] Another method for manufacturing a dimming sheet is provided. The method includes: a groove forming step, in which a groove is formed in a first film including a first transparent support layer and a first transparent electrode layer supported on the first transparent support layer, at least penetrating the first transparent electrode layer, and a first electrode element and a second electrode element electrically insulated from each other through the groove are formed within the first transparent electrode layer; and a dimming layer disposing of a dimming layer, in which a dimming layer is disposed between the first film and a second film including a second transparent support layer and a second transparent electrode layer supported on the second transparent support layer, wherein a groove having a curved portion is formed in the groove forming step, and the width of the narrow portion of the first electrode element located inside the curved portion is 1 mm or more.

[0014] Another method for manufacturing a dimming sheet is provided. The method includes: a groove forming step, in which a groove is formed in a first film including a first transparent support layer and a first transparent electrode layer supported on the first transparent support layer, at least penetrating the first transparent electrode layer, and a first electrode element and a second electrode element electrically insulated from each other by the groove are formed within the first transparent electrode layer; and a dimming layer disposing of a dimming layer, in which a dimming layer is disposed between the first film and a second film including a second transparent support layer and a second transparent electrode layer supported on the second transparent support layer, wherein in the groove forming step, the width of the narrow portion sandwiched between the groove dividing one of the second electrode elements and the groove dividing other of the second electrode elements is 1 mm or more. Attached Figure Description

[0015] Figure 1 This is a front view of the ordinary type of dimming disc according to the first embodiment.

[0016] Figure 2 This is a cross-sectional view of the dimming sheet in this embodiment.

[0017] Figure 3 This is a cross-sectional view of the dimming sheet in this embodiment.

[0018] Figure 4 This is an enlarged view of the main part of the dimming sheet in this embodiment.

[0019] Figure 5 This is an enlarged view of the main part of the dimming sheet in this embodiment.

[0020] Figure 6 This diagram schematically illustrates a method for manufacturing a dimming film according to this embodiment.

[0021] Figure 7 This is a front view of the dimming disc in the non-driving state of this embodiment.

[0022] Figure 8This is a cross-sectional view of the dimming sheet according to the second embodiment.

[0023] Figure 9 This is the front view of the modified dimming disc.

[0024] Figure 10 This is a cross-sectional view of a modified reverse-type dimming disc.

[0025] Figure 11 This is a cross-sectional view of a modified dimming plate.

[0026] Figure 12 This is a cross-sectional view of a modified dimming plate.

[0027] Figure 13 This is a cross-sectional view of a modified dimming plate.

[0028] Figure 14 This is the front view of the modified dimming disc.

[0029] Figure 15 This is the front view of the modified dimming disc.

[0030] Figure 16 This is the front view of the modified dimming disc.

[0031] Figure 17 This is a diagram illustrating an embodiment used for measuring resistance values.

[0032] Figure 18 This is a graph illustrating the resistance values ​​of the embodiments and comparative examples.

[0033] Figure 19 This is a diagram illustrating the effective voltage of the embodiments and comparative examples. Detailed Implementation

[0034] In the accompanying drawings and detailed descriptions, the same reference symbols refer to the same elements. The drawings may not sometimes correspond to a scale, and relative dimensions, proportions, and depictions of elements in the drawings may sometimes be exaggerated for clarity, illustration, and simplicity.

[0035] (First Implementation)

[0036] Reference Figures 1 to 7 An embodiment of a dimming disc and a method for manufacturing a dimming disc will be described. The dimming disc 10 of this embodiment is of the following normal-type: when no voltage signal is applied to the dimming disc 10, the incident light in the area to be driven is scattered, thereby reducing the light transmittance; when a voltage signal is applied to the dimming disc 10, the light transmittance is increased.

[0037] [Dimming filter]

[0038] Reference Figure 1The planar structure of the dimming plate 10 will be described. For example... Figure 1 As shown, the dimming plate 10 has a first surface 11F and a second surface 11R opposite to the first surface 11F. The dimming plate 10 has a driving region 20 and a non-driving region 21.

[0039] The dimming disc 10 has a stacked structure. The driving region 20 is a region of the driving electrode element 30, which is included as part of the stacked structure and is subject to a voltage signal when the dimming disc 10 is driven. The transmittance of the driving region 20 changes depending on the applied voltage signal to the driving electrode element 30. The driving electrode element 30 is an example of a first electrode element. The non-driving region 21 is a region of the floating electrode element 31, which is included as part of the stacked structure and is not subject to a voltage signal when the dimming disc 10 is driven. The floating electrode element 31 is an example of a second electrode element. The transmittance of the driving region 20 changes according to the applied voltage signal, while the transmittance of the non-driving region 21 does not change according to the applied voltage signal. Figure 1 In the middle, the non-driving area 21 is set along the pattern. The pattern is, for example, one or a combination of text, numbers, symbols, graphics, pictures, patterns, etc.

[0040] Figure 1 The non-driving region 21 shown is elongated and line-like in shape, bending at multiple points between one end 21A and the other end 21B. The non-driving region 21 divides the driving region 20 into a driving region 20B with a defined pattern shape and a driving region 20A located outside it. Furthermore, the non-driving regions 21 do not contact or intersect between one end 21A and the other end 21B, maintaining a distance greater than a predetermined distance between them. Figure 1 Even in regions 101 where non-driven regions 21 are close together, a gap is maintained between the non-driven regions 21. Driven regions 20A and 20B, divided by the non-driven regions 21, are electrically connected via a narrow portion 30A located between the first and second portions of the groove 120, which is sandwiched by the groove 120. In other words, the drive electrode element 30 has a conductive portion 26 sandwiched by the groove 120 and the non-driven regions 21, including the floating electrode element 31. The width of the narrow portion 30A is narrower than that of the drive regions 20A and 20B, connecting the drive regions 20A and 20B. The non-driven regions 21 and the narrow portion 30A surround the drive region 20B. The drive region 20A corresponds to the outer region, and the drive region 20B corresponds to the inner region.

[0041] Connection region 24 is a region for applying voltage signals to drive region 20, and external wiring 25 is connected to connection region 24. Connection region 24 is adjacent to drive region 20. The location of connection region 24 in dimming disc 10 is not particularly limited. Connection region 24 may be located, for example, at a corner of dimming disc 10.

[0042] When a voltage signal is applied to the driving region 20 via the connection region 24, the light transmittance of the driving regions 20A and 20B increases. On the other hand, the light transmittance of the non-driving region 21 remains unchanged. Therefore, a pattern 100 appears in the linear non-driving region 21 within the dimming disc 10. At this time, the light transmittance of the driving region 20B, surrounded by the non-driving region 21, increases, thus displaying a so-called "hollow" pattern 100. Furthermore, Figure 1 The dimming disc 10 shown displays one pattern through the non-driving area 21, but it can also display multiple patterns. That is, the dimming disc 10 can also have multiple non-driving areas 21 that are not connected and are independent.

[0043] Reference Figure 2 as well as Figure 3 The layered structure of the dimming plate 10 is explained. Figure 2 It is along Figure 1 The cross-sectional view along line II-II shows the cross-section of the dimming disc 10 at the driving region 20 and the connecting region 24. Additionally, Figure 2 The thickness ratios of the layers shown in the figure are for illustrative purposes only and are not limited to those shown in the figure.

[0044] The dimming film 10 includes a dimming layer 11, a first transparent electrode layer 12A, a second transparent electrode layer 12B, a first transparent support layer 13A, and a second transparent support layer 13B. The dimming layer 11 is sandwiched between the first transparent electrode layer 12A and the second transparent electrode layer 12B. The first transparent support layer 13A supports the side of the first transparent electrode layer 12A opposite to the dimming layer 11 using a single continuous surface, i.e., the support surface 130. The second transparent support layer 13B supports the side of the second transparent electrode layer 12B opposite to the dimming layer 11. Furthermore, the dimming layer 11 can be a single-layer structure or a multi-layer structure. A multi-layer dimming layer 11 can include a functional layer with dimming function and a thin layer that improves the adhesion between the functional layer and the first transparent electrode layer 12A, and between the functional layer and the second transparent electrode layer 12B.

[0045] Furthermore, the dimming plate 10 has a protective layer 44. The protective layer 44 is located on the opposite side of the first transparent electrode layer 12A relative to the first transparent support layer 13A. The protective layer 44 can also be fixed to the first transparent support layer 13A via an adhesive layer (not shown).

[0046] The first surface 11F of the dimming sheet 10 is the side of the protective layer 44 opposite to the side facing the first transparent support layer 13A. The second surface 11R of the dimming sheet 10 is the side of the second transparent support layer 13B opposite to the side facing the second transparent electrode layer 12B. The second surface 11R is adhered to a transparent plate made of glass, resin, or the like via an adhesive layer (not shown). The transparent plate can be, for example, window glass in various buildings such as residences, shops, stations, and airports; partitions in offices; shop windows; or window glass and windshields in moving vehicles such as vehicles and airplanes. The surfaces of the transparent plate can be flat or curved.

[0047] The connection region 24 includes: a first connection region 24A, connected to an external wiring 25 for applying a voltage signal to the first transparent electrode layer 12A; and a second connection region 24B, connected to an external wiring 25 for applying a voltage signal to the second transparent electrode layer 12B.

[0048] The first connection region 24A is the area where the dimming layer 11, the second transparent electrode layer 12B, and the second transparent support layer 13B are absent, and the first transparent electrode layer 12A is exposed. A first terminal portion 50A is connected to the first transparent electrode layer 12A exposed in the first connection region 24A. That is, a driving electrode element 30 extends from the driving region 20 to the first connection region 24A, and the driving electrode element 30 is connected to the first terminal portion 50A in the first connection region 24A.

[0049] The second connection region 24B is the area where the dimming layer 11, the first transparent electrode layer 12A, the first transparent support layer 13A, and the protective layer 44 are absent, and the second transparent electrode layer 12B is exposed. The exposed second transparent electrode layer 12B in the second connection region 24B is connected to a second terminal portion 50B.

[0050] External wiring 25 extends from the first terminal portion 50A and the second terminal portion 50B, respectively, and these external wiring 25 are connected to the control unit 50. The control unit 50 applies a voltage signal to the driving electrode element 30 of the first transparent electrode layer 12A via the first terminal portion 50A, and applies a voltage signal to the second transparent electrode layer 12B via the second terminal portion 50B. Thus, the control unit 50 controls the potential difference between the first transparent electrode layer 12A and the second transparent electrode layer 12B in the driving region 20. The second transparent electrode layer 12B is controlled, for example, to a ground potential. The dimming switch 10 and the control unit 50 constitute a dimming device.

[0051] The dimming layer 11 comprises a transparent polymer layer and a liquid crystal composition. The transparent polymer layer has voids for the liquid crystal composition to fill. The liquid crystal composition fills the voids in the transparent polymer layer. The liquid crystal composition comprises liquid crystal molecules. The material of the liquid crystal composition can be a known material. An example of liquid crystal molecules is any one selected from the group consisting of Schiff bases, azo compounds, azooxy compounds, biphenyl compounds, terphenyl compounds, benzoic acid esters, diphenylacetylene compounds, pyrimidine compounds, cyclohexane carboxylates, phenylcyclohexane compounds, and dioxane compounds. Alternatively, when the dimming layer 11 has a monolayer structure, the dimming layer 11 is composed only of a functional layer comprising a transparent polymer layer and a liquid crystal composition.

[0052] The liquid crystal composition can be held in any of the following forms: polymer network type, polymer dispersion type, and capsule type. The polymer network type has a transparent polymer network with a three-dimensional mesh structure. The gaps in the mesh are interconnected, and the liquid crystal composition is held within these mesh-like gaps. The polymer network is an example of a transparent polymer layer. The polymer dispersion type has multiple isolated gaps in a transparent polymer layer, and the liquid crystal composition is held within these gaps dispersed in the polymer layer. The capsule type holds a capsule-shaped liquid crystal composition within a transparent polymer layer. In addition to the liquid crystal molecules described above, the liquid crystal composition may also include a monomatrix for forming the transparent polymer layer and dichromatic pigments, etc. Furthermore, the dimming layer 11 may also include spacers 15 for maintaining the thickness of the dimming layer 11 within a certain range.

[0053] The first transparent electrode layer 12A and the second transparent electrode layer 12B are both conductive and transparent to visible light. The materials used to form the first transparent electrode layer 12A and the second transparent electrode layer 12B can be known materials. Examples of materials used to form the first transparent electrode layer 12A and the second transparent electrode layer 12B include indium tin oxide, fluorine-doped tin oxide, tin oxide, zinc oxide, carbon nanotubes, and poly(3,4-ethylenedioxythiophene).

[0054] The first transparent support layer 13A and the second transparent support layer 13B are both substrates that are transparent to visible light. The materials used for the first transparent support layer 13A and the second transparent support layer 13B can be known materials. An example of a material used to form the first transparent support layer 13A and the second transparent support layer 13B is a synthetic resin or an inorganic compound. Synthetic resins include, for example, polyesters, polyacrylates, polycarbonates, polyolefins, etc. Polyesters include, for example, polyethylene terephthalate, polyethylene naphthalate, etc. Polycarbonates include, for example, polymethyl methacrylate, etc. Inorganic compounds include, for example, silicon dioxide, silicon nitride, silicon nitride, etc.

[0055] The first terminal portion 50A and the second terminal portion 50B each include, for example, a conductive adhesive layer and a wiring substrate. The conductive adhesive layer is formed, for example, from anisotropic conductive film (ACF), anisotropic conductive paste (ACP), isotropic conductive film (ICF), or isotropic conductive paste (ICP). The wiring substrate is, for example, a flexible printed circuit (FPC).

[0056] Alternatively, the first terminal portion 50A and the second terminal portion 50B may each have a structure in which a conductive material such as a conductive strip is joined to the external wiring 25 by means of brazing or the like.

[0057] In the driving region 20, the orientation of the liquid crystal molecules in the dimming layer 11 changes due to the voltage change generated between the first transparent electrode layer 12A and the second transparent electrode layer 12B. This change in orientation alters the scattering, absorption, and transmission of visible light entering the dimming layer 11. Specifically, when no voltage signal is applied to the first transparent electrode layer 12A and the second transparent electrode layer 12B in the driving region 20, the orientation of the long axis of the liquid crystal molecules is irregular. Therefore, the scattering of light incident on the dimming layer 11 increases, and the driving region 20 appears cloudy. That is, when no voltage signal is applied to the dimming layer 11, the driving region 20 is opaque. On the other hand, when a voltage signal is applied to the first transparent electrode layer 12A and the second transparent electrode layer 12B, creating a potential difference of a predetermined value or higher between them, the liquid crystal molecules are oriented such that their long axis is aligned with the direction of the electric field between the first transparent electrode layer 12A and the second transparent electrode layer 12B. As a result, light can easily pass through the dimming layer 11, and the driving region 20 is transparent.

[0058] Figure 3 It is along Figure 1 The cross-sectional view of line III-III in the diagram includes the non-driving region 21. (See figure) Figure 3As shown, in the first transparent electrode layer 12A, the driving electrode element 30 is located in the driving region 20. The non-driving region 21 includes the floating region 22 where the floating electrode element 31 is located and the boundary region 23 where the groove 120 is located. No electrode elements are contained in the boundary region 23. That is, the floating region 22 is divided by the boundary region 23 formed by the groove 120. Furthermore, the driving electrode element 30 and the floating electrode element 31 are different layered structures arranged along the support surface 130 of the first transparent support layer 13A.

[0059] The driving electrode element 30 and the floating electrode element 31 are separated by the groove 120. In this embodiment, the groove 120 has an opening 122 on the dimming layer 11 side of the first transparent electrode layer 12A, penetrates the first transparent electrode layer 12A, and extends to the middle of the thickness direction of the first transparent support layer 13A. The driving electrode element 30 and the floating electrode element 31 are insulated from each other by being separated by the groove 120.

[0060] The width L2 of the groove 120 can also be smaller than the diameter of the spacer 15. This suppresses the spacer 15 from entering the groove 120. Furthermore, the groove 120 is filled with a liquid crystal composition. The liquid crystal composition only needs to fill a portion of the volume of the groove 120, not the entire volume. By filling the groove 120 with a liquid crystal composition, the groove 120 is not conspicuous when visually inspecting the dimming disc 10 from either the first surface 11F or the second surface 11R.

[0061] Reference Figure 4 as well as Figure 5 The non-driving region 21 will be described. Figure 4 It is Figure 1 The enlarged view of region 101 is shown. Driving regions 20A and 20B are connected by a narrow section 30A disposed between the non-driving regions 21. The narrow section 30A can also be... Figure 4 It is positioned as shown, connecting the first and second portions of the non-driving region 21. Alternatively, the narrow portion 30A may be provided between the end portion 21A and the end portion 21B. To ensure conductivity between the driving region 20A outside the non-driving region 21 and the driving region 20B inside the non-driving region 21, the width L1 of the narrow portion 30A is 1 mm or more. That is, the relative distance between different portions of the non-driving region 21, including a groove 120 and a floating electrode element 31 as a second electrode element, between one end 21A and the other end 21B, is 1 mm or more. When the width L1 of the narrow portion 30A is less than 1 mm, the resistance value of the narrow portion 30A increases, the light transmittance of the driving regions 20A and 20B is not equal, and even if a driving voltage is applied, the driving region 20B may not change from an opaque state to a transparent state. In addition, when... Figure 1When a hollow pattern as shown is displayed on the dimmer sheet 10, the width L1 of the narrow portion 30A can be 30mm or less to improve design flexibility. When the width L1 of the narrow portion 30A exceeds 30mm, it may not achieve the desired shape.

[0062] Additionally, the non-driving region 21 has a curved or bent portion 102, which may be bent or folded depending on the pattern. For example... Figure 4 As shown, when the bending portion 102 in the non-driving region 21 is bent, the minimum value of the angle θ1 formed by the tangents 105 and 106 that are tangent to different positions of the bending portion 102 is 10 degrees or more.

[0063] like Figure 5 As shown, when the curved portion 102 is composed of two straight, non-driven regions 21 extending in different directions, the minimum value of the angle θ2 formed by the non-driven regions 21 is 10 degrees or more. When the angles θ1 and θ2 are less than 10 degrees, the first transparent support layer 13A and the first transparent electrode layer 12A may peel off during or after the formation of the groove 120. By making the angles θ1 and θ2 10 degrees or more, the peeling of the first transparent support layer 13A and the first transparent electrode layer 12A can be suppressed, and the pattern drawn by the non-driven regions 21 can be made clear.

[0064] [Manufacturing method of dimming film]

[0065] Reference Figure 6 An example of a method for manufacturing the dimming plate 10 will be described.

[0066] First, a film 51A having a first transparent electrode layer 12A and a first transparent support layer 13A, and a film 51B having a second transparent electrode layer 12B and a second transparent support layer 13B are assembled. For the film 51A having the first transparent electrode layer 12A and the first transparent support layer 13A, a groove 120 is formed from the side of the first transparent electrode layer 12A using a cutting machine. A control device connected to the cutting machine causes the cutting machine to move along a pre-input pattern to form the groove 120.

[0067] Alternatively, a device other than a cutting machine can be used to form the groove 120. For example, a cutting tool other than a cutting machine or a laser cutting device can be used to form the groove 120 on the first transparent electrode layer 12A. As a laser cutting device, a laser equipped with a CO2 laser can be used, for example. When using a laser cutting device, the area irradiated by the laser can be directly destroyed to form the groove 120.

[0068] Next, a liquid containing spacers 15, primarily made of materials such as divinylbenzene, and a dispersant for dispersing the spacers 15, is applied to the surfaces of the first transparent electrode layer 12A and the second transparent electrode layer 12B of these films 51A and 51B. Then, the films with the spacers 15 dispersed are heated to remove the dispersant. Alternatively, the spacers 15 can be dispersed only in either film.

[0069] Then, a dimming material containing a transparent polymer and a liquid crystal composition is coated onto the first transparent electrode layer 12A of the film 51A with grooves 120 and the second transparent electrode layer 12B of the film 51B without grooves 120. Next, these films 51A and 51B are irradiated with ultraviolet light in a nitrogen atmosphere to form dimming layers 11A and 11B. The resulting pair of film layers are then stacked and bonded while applying a predetermined pressure. This fills the grooves 120 with the dimming material.

[0070] The dimming sheet 10 can be either a roll-to-roll type where the film is wound from the upstream roller to the downstream roller after various processes, or a sheet-type manufacturing process where the film is cut to a specified size and various processes are performed. In either case, the process of forming the groove 120 is performed before the film composed of the first transparent electrode layer 12A and the first transparent support layer 13A, and the film composed of the second transparent electrode layer 12B and the second transparent support layer 13B are bonded to the dimming layer 11.

[0071] Next, the corner of the second surface 11R of the dimming plate 10 of a specified size is cut in to peel off the second transparent support layer 13B and the second transparent electrode layer 12B. Then, the dimming layer 11 is removed, exposing the first transparent electrode layer 12A to form a connection area 24. Similarly, a connection area 24 is also formed at the corner of the first surface 11F. Then, a first terminal portion 50A and a second terminal portion 50B are formed to connect the external wiring 25 to the connection area 24. Then, the connection area 24 is sealed with epoxy resin or the like. Furthermore, the process of attaching the protective layer 44 to the first transparent support layer 13A can also be performed after the pair of films are attached.

[0072] Thus, by cutting into the first transparent electrode layer 12A and the first transparent support layer 13A to form the groove 120, the groove 120 can be formed more simply than, for example, a manufacturing method that includes processes such as forming a resist mask required for pattern formation, exposure, development, etching, removal of the resist mask, and cleaning.

[0073] [effect]

[0074] Reference Figure 1 as well as Figure 7 The function of this embodiment will be explained. Figure 7 This schematically illustrates the transparency of the dimming disc 10 when it is not driven, i.e., when no voltage signal is applied to the first transparent electrode layer 12A and the second transparent electrode layer 12B. When the dimming disc 10 is not driven, both the driven region 20 and the non-driven region 21 are opaque. Therefore, the entire surface of the dimming disc 10 appears, for example, whitish and cloudy, and images of text, pictures, etc., formed by the non-driven region 21 cannot be visually confirmed.

[0075] Furthermore, the groove 120 has a depth that penetrates the first transparent electrode layer 12A but not the first transparent support layer 13A, so the groove 120 is not conspicuous whether viewed from the first surface 11F or the second surface 11R of the dimming sheet 10. In addition, by filling the groove 120 with a dimming material, the groove 120 becomes even less visible to the naked eye. Thus, the aesthetics of the dimming sheet 10 when displaying patterns are improved.

[0076] like Figure 1 As shown, when the dimming disc 10 is driven, the driving region 20 is transparent while the non-driving region 21 is opaque. Therefore, only the non-driving region 21 appears cloudy, for example, white, and the image of text, pictures, or other patterns formed by the non-driving region 21 can be visually confirmed. At this time, the driving region 20B surrounded by the non-driving region 21 and the driving region 20A outside it become transparent when a voltage signal is applied.

[0077] Thus, according to the dimming sheet 10 of this embodiment, regions with different transmittances are formed within the surface of the dimming sheet 10, and the difference in transmittance of these regions only occurs when the dimming sheet 10 is driven. Therefore, when the dimming sheet 10 is driven, images such as text and pictures formed by the non-driven regions 21 can be visually confirmed, thereby enabling the decoration of the space where the dimming sheet 10 is installed. Furthermore, the appearance of the aforementioned images can be switched by switching between driving and not driving the dimming sheet 10, thus allowing the decorative state of the space to change dynamically. Therefore, the design flexibility of the dimming sheet 10 can be improved.

[0078] As explained above, the advantages listed below can be obtained according to the first embodiment.

[0079] (1) By applying a voltage signal only to one of the driving electrode element 30 and the floating electrode element 31, or by applying different voltage signals to the driving electrode element 30 and the floating electrode element 31, the transmittance of the driving region 20 where the driving electrode element 30 is located and the non-driving region 21 where the floating electrode element 31 is located in the dimming sheet 10 can be changed. Therefore, by changing the application state of the voltage signal to these regions, a pattern can be made to appear on the dimming sheet 10, thus improving the design flexibility of the dimming sheet 10. In addition, the width of the narrow portion 30A provided in the driving electrode element 30 is 1 mm or more, so that peeling of the first transparent electrode layer 12A or the first transparent support layer 13A is less likely to occur during the formation process of the groove 120 or after the formation of the groove 120. In addition, the relative distance between the grooves 120 is always maintained at 1 mm or more, so that even when different parts of the same groove 120 or different grooves 120 are close to each other, conductivity within the same electrode element can be ensured in their close portions. Therefore, poor conduction caused by increased resistance in the proximal portion can be suppressed, and the light transmittance of the drive electrode element 30 and the floating electrode element 31 can be appropriately controlled. As a result, the pattern can be clearly displayed on the dimming disc 10, thus improving the design flexibility of the dimming disc 10.

[0080] (2) The inner region 20B, i.e., the driving region 20B, surrounded by the floating electrode element 31 and the groove 120, and the outer region 20A, i.e., the driving region 20A, are connected through the narrow portion 30A. Therefore, depending on the applied voltage signal to the driving electrode element 30, the changes in the light transmittance of the driving regions 20A and 20B can be synchronized. Thus, for example, a hollow pattern with increased transparency on the inner side can be displayed on the dimming disc 10.

[0081] (3) The angle of the bend 102 in the non-driving region 21 or the angle between the tangents 105 and 106 of the bend 102 is 10 degrees or more. Therefore, during the formation process of the groove 120, it is not easy for the first transparent electrode layer 12A or the first transparent support layer 13A to peel off, and it is easy to form the driving electrode element 30 and the floating electrode element 31 into the desired shape. Therefore, the dimming sheet 10 can clearly display the pattern.

[0082] (4) The groove 120, which divides the driving region 20 and the non-driving region 21, has a depth that penetrates the first transparent electrode layer 12A but not the first transparent support layer 13A. Therefore, light scattering caused by the groove 120 can be suppressed on the surface of the first transparent support layer 13A opposite to the support surface. As a result, the groove 120 is not conspicuous when the dimming disc 10 is viewed from the first transparent electrode layer 12A side, at least from the position opposite to the aforementioned side. Therefore, the aesthetics of the dimming disc 10 can be improved.

[0083] (Second Implementation)

[0084] Next, refer to Figure 8 A second embodiment of the dimming plate 10 will be described. Furthermore, in the second embodiment, the layered structure of the dimming plate 10 differs from that of the first embodiment. Hereinafter, the same reference numerals will be used for the parts that are the same as in the first embodiment, and their detailed descriptions will be omitted.

[0085] Figure 8 This shows the cross-section of the dimming plate 10. The driving electrode element 30 and the floating electrode element 31 are separated by a groove 120. The groove 120 extends along the thickness direction of the first transparent electrode layer 12A. In this embodiment, the groove 120 extends along the thickness direction of the first transparent electrode layer 12A and the first transparent support layer 13A, and penetrates through the first transparent electrode layer 12A and the first transparent support layer 13A. The groove 120 has an opening 122 located on the dimming layer 11 side of the first transparent electrode layer 12A, and an opening 124 located in the first transparent support layer 13A on the opposite side of the first transparent electrode layer 12A. The driving electrode element 30 and the floating electrode element 31 are insulated from each other by being separated by the groove 120.

[0086] The opening 124 of the groove 120 is sealed by the protective layer 44 via the adhesive layer 45. The adhesive layer 45 can be any transparent material that can bond the protective layer 44 to the first transparent support layer 13A. For example, the adhesive layer 45 is an optical clear adhesive film that bonds the first transparent support layer 13A to the protective layer 44.

[0087] [Manufacturing method of dimming film]

[0088] An example of a method for manufacturing the dimming plate 10 will be described.

[0089] Similar to the first embodiment, a film 51A having a first transparent electrode layer 12A and a first transparent support layer 13A, and a film 51B having a second transparent electrode layer 12B and a second transparent support layer 13B are prepared. Furthermore, a dimming material containing a transparent polymer material and a liquid crystal composition, with spacers 15 dispersed on the films 51A and 51B, is coated onto them. Dimming layers 11A and 11B are formed, and a pair of films 51A and 51B are stacked while applying a predetermined pressure.

[0090] In the laminate thus formed, a groove 120 is formed by cutting into the first transparent support layer 13A from the surface 131 opposite to the support surface 130 to the dimming layer 11. The method of forming the groove 120 is the same as in the first embodiment. Then, an adhesive layer 45 and a protective layer 44 are overlapped on the surface 131 of the first transparent support layer 13A.

[0091] Alternatively, the groove 120 may not be formed after the formation of the laminate containing the dimming layer 11 sandwiched between films 51A and 51B. The groove 120 may be formed in any process before the formation of the laminate, such as before the process of distributing spacers 15 to film 51A, between the process of distributing spacers 15 and the process of coating dimming material, or between the process of forming dimming layer 11A and the process of laminating films 51A and 51B.

[0092] According to the second embodiment, in addition to the advantages described in (1) to (3) of the first embodiment, the following advantages can also be obtained.

[0093] (5) According to the above configuration, the groove 120 has a depth that penetrates the first transparent support layer 13A and the second transparent support layer. Therefore, the groove 120 can be formed after the first transparent support layer 13A, the first transparent electrode layer 12A, the dimming layer, the second transparent electrode layer, and the second transparent support layer are stacked. The groove 120 can also be formed in the intermediate process of stacking these layers. Therefore, the degree of freedom of the manufacturing process can be improved.

[0094] [Variation Example]

[0095] The above-described embodiments can be modified as follows. Furthermore, the following variations can also be combined.

[0096] In the above embodiments, a method is described in which the driving region 20B surrounded by the linear non-driving region 21 is connected to the driving region 20A outside the non-driving region 21 through the narrow portion 30A, i.e., the conduction portion 26, but the method is not limited to this.

[0097] Figure 9 This indicates a dimming disc 10 with multiple non-driven regions 21. Each non-driven region 21 consists of a floating region 22 and a boundary region 23. The boundary region 23 has a frame-like shape. The boundary region 23 divides the floating region 22, which serves as an enclosed area. Figure 9 The example shown illustrates a dimming disc 10 where a boundary region 23 surrounds a star-shaped floating region 22. The dimming disc 10 includes distinct, independent non-driven regions 21. Between each non-driven region 21 is a narrow portion 30A, sandwiched by different slots 120. The narrow portion 30A is a portion whose width narrows due to the proximity of the different non-driven regions 21, and is a conductive portion 27 that allows the driven regions 20 surrounding the narrow portion 30A to conduct. The width L3 of the narrow portion 30A is 1 mm or more. That is, the relative distance between the different non-driven regions 21 is 1 mm or more. When the width L3 of the narrow portion 30A is less than 1 mm, the conductivity of the narrow portion 30A decreases, and the transmittance of light from the driven regions 20 connected via the narrow portion 30A may become unequal. Furthermore, Figure 9The dimming disc 10 shown has two non-driven regions 21, but it may also have three or more non-driven regions 21.

[0098] In the above embodiments, the groove 120 has a closed frame shape surrounding the floating electrode element 31. Alternatively, or based thereon, if the groove 120 extends along the support surface 130 of the first transparent support layer 13A, the groove 120 may not have a closed frame shape including the floating electrode element 31. For example, the groove 120 may extend from a starting point located at a first end, through the outer periphery of the floating region 22, to an ending point located at a second end, the first end being one of the four sides of the rectangular dimming plate 10. The second end may be located on the same side as the first end, or on a different side. Furthermore, in this manner, even if the dimming plate 10 is not rectangular, the starting point and ending point of the groove 120 only need to be located at the ends of the dimming plate 10.

[0099] • In the above embodiments, the dimming plate 10 is of the ordinary type, but it can also be of the following reverse type: when no voltage signal is applied, the incident light is transmitted and the light transmittance increases, and when a voltage signal is applied, the incident light is scattered and the light transmittance decreases.

[0100] Figure 10 This is an example of a reverse-type dimming disc 10. For example... Figure 10 As shown, the reverse-type dimming film 10 includes a functional layer 111 having a transparent polymer layer and a liquid crystal composition, a first alignment layer 112, and a second alignment layer 113. The first alignment layer 112 and the second alignment layer 113 constitute the dimming layer 11. The first alignment layer 112 is located between the functional layer 111 and the first transparent electrode layer 12A, and is in contact with these layers. The second alignment layer 113 is located between the functional layer 111 and the second transparent electrode layer 12B, and is in contact with these layers.

[0101] The first alignment layer 112 and the second alignment layer 113 are, for example, vertical alignment films or horizontal alignment films. A vertical alignment film aligns the long axis of the liquid crystal molecules along the thickness direction of the dimming layer 11. A horizontal alignment film aligns the long axis of the liquid crystal molecules along a direction approximately orthogonal to the thickness direction of the dimming layer 11. Thus, the first alignment layer 112 and the second alignment layer 113 restrict the orientation of the plurality of liquid crystal molecules contained in the functional layer 111.

[0102] The materials used to form the first orientation layer 112 and the second orientation layer 113 are organic compounds, inorganic compounds, and mixtures thereof. Examples of organic compounds include polyimide, polyamide, polyvinyl alcohol, and cyanide. Examples of inorganic compounds include silicon oxide and zirconium oxide. Alternatively, the materials used to form the first orientation layer 112 and the second orientation layer 113 can also be organosilicon. Organosilicon is a compound having both inorganic and organic components.

[0103] The groove 120 has an opening 122 on the side of the functional layer 111 in the first alignment layer 112, penetrating the first alignment layer 112 and the first transparent electrode layer 12A but not penetrating the first transparent support layer 13A. That is, the depth of the groove 120 is less than the sum of the thicknesses of the first alignment layer 112, the first transparent electrode layer 12A, and the first transparent support layer 13A. A portion of the functional layer 111 is filled in the groove 120. Alternatively, the groove 120 may also penetrate the first transparent support layer 13A in the same way as in the second embodiment.

[0104] When the dimming disc 10 has a first alignment layer 112 and a second alignment layer 113, in the driving region 20, when no voltage signal is applied to the first transparent electrode layer 12A and the second transparent electrode layer 12B, the orientation of the long axis of the liquid crystal molecules becomes the orientation along the thickness direction of the dimming layer 11. Therefore, the driving region 20 is transparent. On the other hand, in the driving region 20, when a voltage signal is applied to the first transparent electrode layer 12A and the second transparent electrode layer 12B, the orientation of the long axis of the liquid crystal molecules becomes the orientation intersecting the thickness direction of the dimming layer 11. Therefore, the driving region 20 appears cloudy and opaque. When the dimming disc 10 has a first alignment layer 112 and a second alignment layer 113, in the floating region 22 and the boundary region 23, the orientation of the long axis of the liquid crystal molecules always becomes the orientation along the thickness direction of the dimming layer 11, therefore the non-driving region 21 is always transparent.

[0105] Therefore, when the dimming disc 10 is not driven, both the driven area 20 and the non-driven area 21 are transparent, and the image of text, pictures, etc. formed by the non-driven area 21 cannot be visually confirmed. On the other hand, when the dimming disc 10 is driven, the driven area 20 is opaque and the non-driven area 21 is transparent, so the image of text, pictures, etc. formed by the non-driven area 21 can be visually confirmed.

[0106] Thus, even when the dimming film 10 has a first alignment layer 112 and a second alignment layer 113, regions with different transmittances are formed within the surface of the dimming film 10, and the difference in transmittance between these regions only occurs when the dimming film 10 is driven. This improves the design flexibility of the dimming film 10.

[0107] Alternatively, in the above-described manner, the groove 120 extends through the first alignment layer 112. However, the first alignment layer 112 can also be formed after the groove 120 is formed in the laminate composed of the first transparent electrode layer 12A and the first transparent support layer 13A. In this case, the first alignment layer 112 is formed along the bottom and side surfaces of the groove 120. Thus, the groove 120 can be made inconspicuous when viewed from the outside.

[0108] In the above embodiments, when the dimming sheet 10 has a plurality of slots 120, these slots 120 are located at the same depth in the stacking direction (thickness direction) of each layer constituting the dimming sheet 10. Alternatively, or based on this, the plurality of slots 120 may be located at different depths in the stacking direction. Figures 11-13 Examples are given, but in each of these examples, the method of forming the slot 120 can use the methods of the embodiments described above. Furthermore, although the dimming disc 10 is described as a common type, it can also be applied to a reverse type. Moreover, although in Figures 11-13 The text indicates that the slot 120 is not filled with dimming material, but dimming material can also be filled in at least a portion of the slot 120.

[0109] Figure 11 One groove 120A is shown, penetrating both the first transparent support layer 13A and the first transparent electrode layer 12A. The other groove 120B penetrates only the second transparent electrode layer 12B. The groove 120B can also be formed from the second transparent support layer 13B side using a laser cutting device or the like.

[0110] Figure 12 This illustrates another example where multiple slots 120 are formed at different locations in the stacking direction. In this example, the multiple slots 120 are formed by cutting into the first transparent support layer 13A. One slot 120A penetrates both the first transparent support layer 13A and the first transparent electrode layer 12A. Another slot 120B penetrates not only the first transparent support layer 13A and the first transparent electrode layer 12A but also the dimming layer 11 and the second transparent electrode layer 12B. Furthermore, the slots 120 can be filled with a dimming material within the dimming layer 11.

[0111] Figure 13 Other examples illustrate the formation of multiple slots 120 at different locations in the stacking direction. One slot 120A penetrates the first transparent support layer 13A and the first transparent electrode layer 12A. Another slot 120B penetrates the second transparent support layer 13B and the second transparent electrode layer 12B.

[0112] In each of the above examples, the slots 120A and 120B can be configured so that they do not overlap when the dimming disc 10 is viewed from the first surface 11F or from the second surface 11R. The area where the slots 120A and 120B are formed becomes the boundary region 23. Furthermore, when multiple slots 120A and 120B are formed close to each other, the intensity of the area sandwiched between the slots 120A and 120B tends to decrease. However, by placing the multiple slots 120 at different positions in the stacking direction as in the above examples, the intensity reduction of the dimming disc 10 can be suppressed even when multiple slots 120A and 120B are formed close to each other.

[0113] In the above embodiment, the driving electrode element 30, which is the first electrode element, is applied with a voltage signal, while the floating electrode element 31, which is the second electrode element, is not applied with a voltage signal. Alternatively, the first electrode element and the second electrode element may be applied with voltage signals separately. In this case, wiring for applying a voltage signal to the second electrode element is connected to the end of the second electrode element. The terminal portion to which the first electrode element is connected and the terminal portion to which the second electrode element is connected are separate terminals independent of each voltage signal. As described above, if the second electrode element is located at the end of the dimming disc 10, it is easy to connect wiring to the second electrode element. For example, the first region where the first electrode element is located is switched between transparent and opaque by switching the application state of the voltage signal to the first electrode element. And the second region where the second electrode element is located is switched between transparent and opaque independently of the first region by switching the application state of the voltage signal to the second electrode element. Based on this configuration, it is possible to switch between four states: a state where both the first and second regions are transparent, a state where the first region is opaque and the second region is transparent, a state where the first region is transparent and the second region is opaque, and a state where both the first and second regions are opaque. Therefore, the dimming sheet 10 can be used to create a variety of decorative states in the space, thereby further enhancing the aesthetic design of the dimming sheet 10.

[0114] • The transmittance of at least one of the first and second regions can also be controlled to a transmittance corresponding to the range between transparent and opaque. In the dimming sheet 10 comprising a dimming layer 11 containing a liquid crystal composition, when the potential difference between the first transparent electrode layer 12A and the second transparent electrode layer 12B is within a predetermined range, the transmittance of the dimming sheet 10 gradually changes with the change of the potential difference. Therefore, in either the first or second region, by controlling the potential difference between the first transparent electrode layer 12A and the second transparent electrode layer 12B to a value between the potential difference that makes the region transparent and the potential difference that makes the region opaque, it is possible to control the region to be semi-transparent with a transmittance between transparent and opaque.

[0115] Specifically, for example, by switching the application state of the voltage signal to the first electrode element, the first region is switched between transparent and opaque; by switching the application state of the voltage signal to the second electrode element, the second region is switched between translucent and opaque. When the first region is transparent, the second region is controlled to be translucent. With this configuration, it is possible to switch between a state where both the first and second regions are opaque, and a state where the first region is opaque and the second region is translucent. This also improves the appearance design of the dimming sheet 10.

[0116] In the first embodiment, the driving regions 20A and 20B, divided by the non-driving region 21, are electrically connected to each other via a narrow portion 30A. Alternatively, the driving regions 20A and 20B, divided by the non-driving region 21, may be electrically connected to each other via multiple narrow portions 30A. In other words, the driving electrode element 30 has multiple conductive portions 26 sandwiched by the non-driving region 21. The narrow portion 30A has the same configuration as in the first embodiment. For example, as shown in... Figure 14 As shown, the drive regions 20A and 20B can also be electrically connected to each other via the two narrow portions 30A. The width of the narrow portion 30A is 1 mm or more.

[0117] • As one way to form a display pattern when the dimming plate 10 is driven, the dimming plate 10 may also have a first electrode element and a wider slot 120C. Figure 15 The method shown is such that the dimming plate 10 has a first electrode element that changes the light transmittance according to the applied state of a voltage signal and a wide groove 120C, but no second electrode element. The wide groove 120C can also be referred to as a recess. Figure 15 In the example, the entire letter "C" is formed by grooves 120C. The area where grooves 120C are formed does not include electrode elements. Grooves 120C are filled with at least one of a liquid crystal composition, a transparent polymer layer, and a liquid crystal composition. Alternatively, grooves 120C may be filled with substances other than the transparent polymer layer and the liquid crystal composition, or they may be unfilled voids. When the dimming disc 10 is not driven, both the driving area 20 where grooves 120C are not formed and grooves 120C are opaque. When the dimming disc 10 is driven, the driving area 20 is transparent while grooves 120C are opaque. Therefore, only grooves 120C appear cloudy, for example, whitish, and the image of the text, pictures, or other patterns formed by the grooves 120C can be visually confirmed. Figure 15 In the example, the letter "C" can be visually identified. When the dimming disc 10 has multiple slots 120C, the width L30 of the narrow portion 30A divided by the multiple slots 120C is 1 mm or more. Furthermore, the width L10 of the narrow portion 30A formed by one slot 120C is 1 mm or more. The definition of the narrow portion 30A is the same as in the embodiment described above.

[0118] ·like Figure 16 As shown, the first connection region 24A, as an example of a non-driving region, includes a first terminal portion 50A, located in the first transparent electrode layer 12A, exposed from the dimming layer 11. The second connection region 24B, as another example of a non-driving region, includes a second terminal portion 50B, located in the second transparent electrode layer 12B, exposed from the dimming layer 11. The first connection region 24A and the second connection region 24B are arranged along a first direction. The first direction is the direction in which the end edge 10A of the dimming plate 10 extends, and is... Figure 16 The shortest distance between a straight line passing through the slot 120 and along the first direction and a straight line passing through the first connecting region 24A and extending along the first direction is the relative distance L6. When voltage uniformity is required in the dimming disc 10, the relative distance L6 is preferably 5 mm to 50 mm, more preferably 5 mm to 20 mm. That is, the relative distance L6 is the distance between the first connecting region 24A and the second connecting region 24B and the slot 120 in a direction orthogonal to the end edge 10A of the dimming disc 10.

[0119] Furthermore, in configurations where the floating element ratio per unit area is 30% or more, the voltage between the first terminal portion 50A and the second terminal portion 50B is prone to becoming uneven. Therefore, in configurations where the floating element ratio per unit area is 30% or more, when voltage uniformity is required in the dimming disc 10, the relative distance L6 is particularly preferably 5 mm or more and 50 mm or less. Here, the unit area is the area adjacent to the first connection area 24A and the area adjacent to the second connection area 24B. The unit area is distinguished relative to the first connection area 24A by a straight line extending along a first direction through the first connection area 24A. The length of the unit area in the first direction is 100 mm, and the length of the unit area in the second direction, which is orthogonal to the first direction, is 100 mm. The floating element ratio is the ratio of the area of ​​the floating electrode element 31 to the sum of the areas of the driving electrode element 30 (which is the first electrode element) and the floating electrode element 31 (which is the second electrode element).

[0120] • In the narrow portion 30A, the peel strength of the layer supporting the dimming layer 11 relative to the dimming layer 11 is preferably 0.01 N or more. In the dimming sheet 10, the peel strength of the portion including the narrow portion 30A is measured by the method conforming to "6.9.3a) 180-degree peel test" in JIS A 5759:2016. In the case of a common type of dimming sheet 10, it is the peel strength of the first transparent electrode layer 12A relative to the dimming layer 11. In the case of a reverse type of dimming sheet 10, it is the peel strength of the first alignment layer 112 relative to the dimming layer 11. According to this method, peeling of the layer supporting the dimming layer 11 in the narrow portion 30A can be suppressed. It is further preferable that the width of the narrow portion 30A is 2 mm or more, and the peel strength per unit width (10 mm) of the narrow portion 30A is 0.1 N or more. According to this method, peeling of the layer supporting the dimming layer 11 in the narrow portion 30A can be further suppressed.

[0121] • Membrane 51A prior to the formation of the narrow portion 30A (refer to) Figure 6 Preferably, the peel strength of the layer supporting the dimming layer 11 relative to the dimming layer 11 is 0.4 N / 25 mm. A narrow portion 30A with a width of 2 mm or more is formed in the film 51A. The peel strength is measured by the method conforming to "6.9.3a) 180-degree peel test" in JIS A5759:2016. Therefore, even when the narrow portion 30A is narrowed to about 2 mm in width, peeling in the narrow portion 30A can be suppressed.

[0122] [Example]

[0123] <Preparation of Sample 1>

[0124] (Example 1)

[0125] The embodiments described above are examples of the various implementation methods. Furthermore, these embodiments do not limit the scope of the invention.

[0126] like Figure 17 As shown, a rectangular resistance measurement region 143, measuring 50 mm × 25 mm, is formed on a substrate having a transparent electrode layer 140 and a transparent support layer 141. Two resistance measurement regions 143 are connected via a narrow portion 144 (conductive portion) with a width L4 of 50 mm and a length L5 of 100 mm to create a measurement sample. A detector is then connected to the two resistance measurement regions 143 to measure the resistance value.

[0127] (Example 2)

[0128] Except that the width L4 of the narrow portion 144 was set to 30 mm, the test sample was prepared in the same manner as in Example 1.

[0129] (Example 3)

[0130] Except that the width L4 of the narrow portion 144 was set to 10 mm, the test sample was prepared in the same manner as in Example 1.

[0131] (Example 4)

[0132] Except that the width L4 of the narrow portion 144 was set to 5 mm, the test sample was prepared in the same manner as in Example 1.

[0133] (Example 5)

[0134] Except that the width L4 of the narrow portion 144 was set to 2 mm, the test sample was prepared in the same manner as in Example 1.

[0135] (Example 6)

[0136] Except that the width L4 of the narrow portion 144 was set to 1 mm, the test sample was prepared in the same manner as in Example 1.

[0137] (Comparative Example 1)

[0138] Except that the width L4 of the narrow portion 144 was set to 0.5 mm, the test sample was prepared in the same manner as in Example 1.

[0139] <Measurement and Evaluation of Resistance Values>

[0140] The resistance value was measured using a digital multimeter (Yokogawa Corporation, TY530).

[0141] like Figure 18 As shown, the resistance values ​​(Ω) of Examples 1 to 6 are “494”, “719”, “1225”, “2259”, “5220”, and “10900”, respectively, increasing as the width L4 of the narrow portion 144 decreases. In Comparative Example 1, the resistance value is “26800”, which is significantly larger than that of Examples 1 to 6.

[0142] <Preparation of Sample 2>

[0143] Next, the effective voltage was measured in a dimming sheet with a dimming layer sandwiched between a pair of substrates.

[0144] (Example 7)

[0145] Prepare to have with Figure 2 The dimming sheet shown is a dimming sheet with the same stacked structure as the dimming sheet 10. Furthermore, a rectangular characteristic measurement area of ​​50mm × 25mm is secured in two separate locations, and these characteristic measurement areas are connected by a narrow section. The narrow section has a width of 50mm and a length of 100mm. Moreover, it is similar to... Figure 2 The dimming disc 10 shown similarly cuts into the corner of one surface (the second surface), peels off the transparent support layer and the transparent electrode layer, and removes the liquid crystal to form a connection region. Similarly, it cuts into the corner of one surface (the first surface), peels off the transparent support layer and the transparent electrode layer, and removes the liquid crystal to form a connection region. Then, external wiring is connected to these connection regions, enabling control of the voltage applied to the characteristic measurement region.

[0146] (Example 8)

[0147] Except that the width of the narrow portion was set to 30 mm, the test sample was prepared in the same manner as in Example 7.

[0148] (Example 9)

[0149] Except that the width of the narrow portion was set to 10 mm, the test sample was prepared in the same manner as in Example 7.

[0150] (Example 10)

[0151] Except that the width of the narrow portion was set to 5 mm, the test sample was prepared in the same manner as in Example 7.

[0152] (Example 11)

[0153] Except that the width of the narrow portion was set to 2 mm, the test sample was prepared in the same manner as in Example 7.

[0154] (Example 12)

[0155] Except that the width of the narrow portion was set to 1 mm, the test sample was prepared in the same manner as in Example 7.

[0156] (Comparative Example 2)

[0157] Except that the width of the narrow portion was set to 0.5 mm, the test sample was prepared in the same manner as in Example 7.

[0158] <Determination and Evaluation of Effective Voltage>

[0159] A voltage of 80V, 40Hz, and a rectangular waveform was applied to the characteristic measurement area using a power supply device (manufactured by Toppan Printing Co., Ltd.), and the effective voltage was measured using the device.

[0160] like Figure 19As shown, the effective voltage of Examples 7 to 12, with a conduction width of 1.0 mm or more, was 79.6 to 81.4 V. It decreased as the width of the narrow portion narrowed, but the effective voltage did not change significantly. In Comparative Example 2, where the width of the narrow portion was 0.5 mm, the effective voltage was significantly lower at 7.9 V. Furthermore, in Comparative Example 2, poor conductivity occurred due to repeated switching on and off of the voltage.

Claims

1. A dimming film, comprising: First transparent electrode layer; Second transparent electrode layer; A dimming layer is located between the first transparent electrode layer and the second transparent electrode layer; A first transparent support layer, located on the opposite side of the dimming layer relative to the first transparent electrode layer, and having a support surface supporting the first transparent electrode layer; and The second transparent support layer is located on the opposite side of the dimming layer relative to the second transparent electrode layer. The aforementioned first transparent electrode layer includes a first electrode element and a second electrode element. The first electrode element and the second electrode element are different layered bodies arranged along the support surface and are electrically insulated from each other by grooves extending along the support surface. The aforementioned first electrode element includes a narrow portion clamped by the aforementioned groove. The width of the aforementioned narrow portion is 1 mm or more. The aforementioned first electrode element is an electrode element whose light transmittance changes according to the applied state of the voltage signal. The aforementioned second electrode element is the electrode element that is not subject to a voltage signal during dimming disc driving. The aforementioned second electrode element is surrounded by the aforementioned groove.

2. The dimming film as described in claim 1, wherein, The first electrode element described above is an electrode element that changes the light transmittance according to the applied state of the voltage signal. Furthermore, through the second electrode element and the groove provided along the second electrode element, the first electrode element is divided into an inner region surrounded by the second electrode element and the groove, and an outer region adjacent to the inner region through the second electrode element and the groove. The aforementioned inner region and the aforementioned outer region are connected through the aforementioned narrow portion.

3. The dimming film as described in claim 2, wherein, The aforementioned inner region is provided with a plurality of narrow portions that connect the aforementioned inner region to the aforementioned outer region.

4. The dimming film according to any one of claims 1 to 3, wherein, The angle between the curved portion of the first electrode element or the second electrode element, or the angle between the tangents of the curved portion and each other, is 10 degrees or more.

5. The dimming film according to any one of claims 1 to 3, wherein, The groove has an opening on the dimming layer side of the first transparent electrode layer, the depth direction of the groove is the thickness direction of the first transparent electrode layer, and the groove has a depth that penetrates the first transparent electrode layer but does not penetrate the first transparent support layer.

6. The dimming film according to any one of claims 1 to 3, wherein, The groove has an opening on the dimming layer side of the first transparent support layer, the depth direction of the groove is the thickness direction of the first transparent electrode layer, and the groove has a depth that penetrates the first transparent support layer and the first transparent electrode layer.

7. The dimming film according to any one of claims 1 to 3, wherein, The peel strength of the layer supporting the dimming layer in the narrow portion relative to the dimming layer is 0.01N or more.

8. The dimming film according to any one of claims 1 to 3, comprising: The first connection region includes a first terminal portion for applying voltage to the first transparent electrode layer, and a portion of the first transparent electrode layer exposed from the dimming layer; and The second connection region includes a second terminal portion for applying voltage to the second transparent electrode layer, and a portion of the second transparent electrode layer that is exposed from the dimming layer. The first connecting region and the second connecting region are arranged along the first direction. The shortest distance between a straight line passing through the first connecting area along the first direction and a straight line passing through the groove along the first direction is 5 mm or more and 50 mm or less.

9. A dimming film, comprising: First transparent electrode layer; Second transparent electrode layer; A dimming layer is located between the first transparent electrode layer and the second transparent electrode layer; A first transparent support layer, located on the opposite side of the dimming layer relative to the first transparent electrode layer, and having a support surface supporting the first transparent electrode layer; and The second transparent support layer is located on the opposite side of the dimming layer relative to the second transparent electrode layer. The aforementioned first transparent electrode layer includes a first electrode element and a second electrode element. The first electrode element and the second electrode element are different layered bodies arranged along the support surface and are electrically insulated from each other by grooves extending along the support surface. The aforementioned groove has a curved portion, and the aforementioned first electrode element has a narrow portion located inside the curved portion, the width of which is 1 mm or more. The aforementioned first electrode element is an electrode element whose light transmittance changes according to the applied state of the voltage signal. The aforementioned second electrode element is the electrode element that is not subject to a voltage signal during dimming disc driving. The aforementioned second electrode element is surrounded by the aforementioned groove.

10. A dimming film, comprising: First transparent electrode layer; Second transparent electrode layer; A dimming layer is located between the first transparent electrode layer and the second transparent electrode layer; A first transparent support layer, located on the opposite side of the dimming layer relative to the first transparent electrode layer, and having a support surface supporting the first transparent electrode layer; and The second transparent support layer is located on the opposite side of the dimming layer relative to the second transparent electrode layer. The aforementioned first transparent electrode layer includes a first electrode element and multiple second electrode elements. The first electrode element and the second electrode element are different layered bodies arranged along the support surface, and these electrode elements are electrically insulated from other electrode elements by grooves extending along the support surface. The width of the narrow portion sandwiched between the groove dividing one of the aforementioned second electrode elements and the groove dividing other of the aforementioned second electrode elements is 1 mm or more. The aforementioned first electrode element is an electrode element whose light transmittance changes according to the applied state of the voltage signal. The aforementioned second electrode element is the electrode element that is not subject to a voltage signal during dimming disc driving. The aforementioned second electrode element is surrounded by the aforementioned groove.

11. A method for manufacturing a dimming film, comprising: The trench forming process involves forming a trench at least penetrating the first transparent electrode layer in a first film comprising a first transparent support layer and a first transparent electrode layer supported on the first transparent support layer, and forming a first electrode element and a second electrode element electrically insulated from each other through the trench within the first transparent electrode layer; and In the process of setting the dimming layer, the dimming layer is set between the first film and the second film, which includes a second transparent support layer and a second transparent electrode layer supported on the second transparent support layer. In the above-described groove forming process, the width of the narrow portion provided on the first electrode element and sandwiched by the groove is 1 mm or more. The aforementioned first electrode element is an electrode element whose light transmittance changes according to the applied state of the voltage signal. The aforementioned second electrode element is the electrode element that is not subject to a voltage signal during dimming disc driving. In the above-described groove forming process, the groove is formed to surround the second electrode element.

12. The method for manufacturing a dimming film as described in claim 11, wherein, In the above-described groove forming process, the first film used has a peel strength of 0.4 N / 25 mm or more relative to the dimming layer of the layer supporting the dimming layer. In the above-described groove forming process, the width of the narrow portion provided on the first electrode element and sandwiched by the groove is 2 mm or more.

13. A method for manufacturing a dimming film, comprising: The trench forming process involves forming a trench at least penetrating the first transparent electrode layer in a first film comprising a first transparent support layer and a first transparent electrode layer supported on the first transparent support layer, and forming a first electrode element and a second electrode element electrically insulated from each other through the trench within the first transparent electrode layer; and In the process of setting the dimming layer, the dimming layer is set between the first film and the second film, which includes a second transparent support layer and a second transparent electrode layer supported on the second transparent support layer. In the above-described groove forming process, a groove with a curved portion is formed, and the width of the narrow portion of the first electrode element that is divided inside the curved portion is 1 mm or more. The aforementioned first electrode element is an electrode element whose light transmittance changes according to the applied state of the voltage signal. The aforementioned second electrode element is the electrode element that is not subject to a voltage signal during dimming disc driving. In the above-described groove forming process, the groove is formed to surround the second electrode element.

14. A method for manufacturing a dimming film, comprising: The trench forming process involves forming a trench, at least penetrating the first transparent electrode layer, in a first film including a first transparent support layer and a first transparent electrode layer supported on the first transparent support layer; and forming a first electrode element and a plurality of second electrode elements electrically insulated from each other through the trench within the first transparent electrode layer; and In the process of setting the dimming layer, the dimming layer is set between the first film and the second film, which includes a second transparent support layer and a second transparent electrode layer supported on the second transparent support layer. In the above-described groove forming process, the width of the narrow portion sandwiched between the groove dividing one of the second electrode elements and the groove dividing other of the second electrode elements is 1 mm or more. The aforementioned first electrode element is an electrode element whose light transmittance changes according to the applied state of the voltage signal. The aforementioned second electrode element is the electrode element that is not subject to a voltage signal during dimming disc driving. In the above-described groove forming process, the groove is formed to surround the second electrode element.

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