Dimmer plate and dimmer sheet

Abstract

To provide a dimmer plate and a dimmer sheet with which it is possible to heighten the reliability of a structure in the vicinity of a wiring connection part.SOLUTION: A dimmer plate 100 comprises a dimmer sheet 11, a first wiring connection part 51, a second wiring connection part 52, and a transparent plate 110. The dimmer sheet 11 has a first connection area SA to which the first wiring connection part 51 is connected, and a second connection area SB to which the second wiring connection part 52 is connected. At least one of the first connection area SA and the second connection area SB is a target connection area, and the dimmer sheet 11 has auxiliary structural parts 81, 82 that are notches or holes penetrating the dimmer sheet 11 in an area adjacent to the target connection area. The dimmer plate 100 is provided with pasting members 71, 72 that cover the target connection area and the auxiliary structural parts 81, 82 and are fixed to the transparent plate 110 through the auxiliary structural parts 81, 82.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a light control board and a light control sheet with variable light transmittance. [Background technology]

[0002] The light-control sheet includes a light-control layer containing a liquid crystal composition and a pair of transparent electrode layers sandwiching the light-control layer. The orientation state of the liquid crystal composition changes depending on whether or not a voltage is applied to the transparent electrode layer, making it possible to switch between a transparent state in which light passes through the light-control layer and an opaque state in which light transmission through the light-control layer is suppressed by scattering or the like (see, for example, Patent Document 1).

[0003] A wiring connection part for connecting the transparent electrode layer to a power source is attached to the light-controlling sheet. The light-controlling sheet is then attached to a transparent plate such as a window glass. An example of the structure near the wiring connection part will be described with reference to the drawings.

[0004] As shown in Figures 13 and 14, the light control panel 210 includes a light control sheet 211, wiring connections 221 and 222, and a transparent plate 240. The light control sheet 211 includes a light control layer 200, a first transparent electrode layer 201 supported by a first transparent support layer 203, and a second transparent electrode layer 202 supported by a second transparent support layer 204. The light control layer 200 is sandwiched between the first transparent electrode layer 201 and the second transparent electrode layer 202. The surface of the second transparent support layer 204 opposite the second transparent electrode layer 202 is attached to the transparent plate 240 via an adhesive layer 230.

[0005] Figure 13 shows the structure of the portion where the first wiring connection portion 221 for electrically connecting the first transparent electrode layer 201 to a power source is connected to the light-control sheet 211, and Figure 14 shows the structure of the portion where the second wiring connection portion 222 for electrically connecting the second transparent electrode layer 202 to a power source is connected to the light-control sheet 211.

[0006] As shown in FIG. 13 , at the end of the light-controlling sheet 211 to which the first wiring connection portion 221 is connected, the first transparent electrode layer 201 is exposed from the light-controlling layer 200, the second transparent electrode layer 202, and the second transparent support layer 204. The first wiring connection portion 221 is connected to this exposed portion of the first transparent electrode layer 201. More specifically, the first wiring connection portion 221 includes a first wiring substrate 223 and a first conductive adhesive layer 224, and the first wiring substrate 223 is fixed to the first transparent electrode layer 201 via the first conductive adhesive layer 224. A first wiring 251 is connected to the first wiring substrate 223. The periphery of the connection portion between the first transparent electrode layer 201 and the first wiring connection portion 221 is covered with a first sealing portion 227.

[0007] As shown in FIG. 14 , at the end of the light-controlling sheet 211 where the second wiring connection portion 222 is connected, the second transparent electrode layer 202 is exposed from the light-controlling layer 200, the first transparent electrode layer 201, and the first transparent support layer 203. The second wiring connection portion 222 is connected to this exposed portion of the second transparent electrode layer 202. The second wiring connection portion 222 includes a second wiring substrate 225 and a second conductive adhesive layer 226, and the second wiring substrate 225 is fixed to the second transparent electrode layer 202 via the second conductive adhesive layer 226. A second wiring 252 is connected to the second wiring substrate 225. The periphery of the connection portion between the second transparent electrode layer 202 and the second wiring connection portion 222 is covered with a second sealing portion 228. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-45135 Summary of the Invention [Problem to be solved by the invention]

[0009] In the connection structure of the first wiring connection portion 221 shown in FIG. 13, the first wiring connection portion 221 and the transparent plate 240 face each other with a gap therebetween. In other words, the first wiring connection portion 221 is floating relative to the transparent plate 240. Therefore, when a force is applied to the first wiring substrate 223 in a direction away from the transparent plate 240 due to the weight or movement of the first wiring 251, cracks due to bending may occur in the first transparent electrode layer 201 near the connection portion between the first transparent electrode layer 201 and the first wiring connection portion 221, as shown in FIG. 15. Such cracks in the first transparent electrode layer 201 can cause problems when driving the light control sheet 211.

[0010] 14, second transparent electrode layer 202 is fixed to transparent plate 240 together with second transparent support layer 204, and therefore cracks due to bending are unlikely to occur in second transparent electrode layer 202. However, when force is applied to second wiring substrate 225 in a direction away from transparent plate 240, second wiring substrate 225 may peel off from second transparent electrode layer 202, causing abnormalities in conductivity, as shown in FIG.

[0011] Furthermore, when force is applied to the wiring boards 223, 225 in a direction away from the transparent plate 240, the fixation of the light controlling sheet 211 to the transparent plate 240 near the wiring connections 221, 222 weakens, and the light controlling sheet 211 may peel off or float.

[0012] These problems occurring near the wiring connections 221, 222 can be solved, for example, by covering the connection portions between the light controlling sheet 211 and the wiring connections 221, 222 and the surrounding transparent plate 240 with adhesive tape to strengthen the fixation of the light controlling sheet 211 and the wiring connections 221, 222 to the transparent plate 240. However, placing the tape in this manner means fixing the wiring boards 223, 225 to the transparent plate 240 on the periphery of the light controlling sheet 211, which reduces the flexibility of handling the wiring boards 223, 225 when connecting the wiring 251, 252, etc. Furthermore, in order to place the tape, an area where the transparent plate 240 is exposed is required on the periphery of the light controlling sheet 211. However, when the transparent plate 240 is window glass, for example, the transparent plate 240 is fitted into a frame such as a sash, making it difficult to secure a sufficient area on the periphery of the light controlling sheet 211.

[0013] Therefore, a new structure is desired for the structure near the wiring connection portions 221 and 222 to solve the above-mentioned problems. [Means for solving the problem]

[0014] Various aspects of the light control plate and light control sheet for solving the above problems will be described. [Aspect 1] A light-controlling sheet comprising: a light-controlling layer containing a liquid crystal composition; and a pair of transparent electrode layers sandwiching the light-controlling layer, the pair being a first transparent electrode layer and a second transparent electrode layer; a first wiring connection portion for electrically connecting the first transparent electrode layer to a power source; a second wiring connection portion for electrically connecting the second transparent electrode layer to a power source; and a transparent plate to which the back surface of the light-controlling sheet is attached, wherein the light-controlling sheet has a first connection region to which the first wiring connection portion is connected and a second connection region to which the second wiring connection portion is connected, and at least one of the first connection region and the second connection region is a target connection region, and when viewed from a position facing the surface of the light-controlling sheet, the light-controlling sheet has an auxiliary structure that is a notch or hole that penetrates the light-controlling sheet in a region adjacent to the target connection region, and an attachment member attached to the surface of the light-controlling sheet, the attachment member covering the target connection region and the auxiliary structure and fixed to the transparent plate via the auxiliary structure.

[0015] According to the above configuration, the adhesive member covering the target connection area is fixed to the transparent plate near the target connection area via the auxiliary structure. Therefore, the target connection area is protected, and the fixation of the light-adjusting sheet and the wiring connection portion to the transparent plate is strengthened around the target connection area. This reduces peeling of the light-adjusting sheet or wiring substrate, cracks in the transparent electrode layer, and other problems. This increases the reliability of the structure near the wiring connection portion. Furthermore, since the adhesive member can be fixed without extending to the periphery of the light-adjusting sheet, the above effects can be achieved without being restricted by the degree of freedom of the wiring connection portion or the size of the peripheral area of the light-adjusting sheet.

[0016] [Aspect 2] A dimming panel as described in [Aspect 1], wherein the auxiliary structure is a notch recessed in the outer edge of the dimming sheet when viewed from a position opposite the surface of the dimming sheet. According to the above configuration, the auxiliary structure portion can be easily formed in the light controlling sheet.

[0017] [Aspect 3] A dimming panel as described in [Aspect 1], wherein the auxiliary structure is a hole that penetrates the dimming sheet when viewed from a position opposite the surface of the dimming sheet. According to the above configuration, the external shape of the light controlling sheet does not change compared to when the auxiliary structure portion is not formed, making the light controlling sheet easier to handle.

[0018] [Aspect 4] A dimming board described in any one of [Aspect 1] to [Aspect 3], wherein the target connection area is located along the outer edge of the dimming sheet when viewed from a position opposite the surface of the dimming sheet, and the dimming sheet has two auxiliary structures arranged on either side of the target connection area along the direction in which the outer edge of the dimming sheet extends in the target connection area.

[0019] According to the above configuration, the attachment members are fixed to the transparent plate via the auxiliary structures on both sides of the target connection area, thereby further strengthening the fixation of the light controlling sheet and the wiring connection portion to the transparent plate in and around the target connection area.

[0020] [Aspect 5] A dimming board described in any one of [Aspect 1] to [Aspect 4], wherein, when viewed from a position facing the surface of the dimming sheet, the target connection area is located along the outer edge of the dimming sheet, and in a direction perpendicular to the outer edge, the auxiliary structure is positioned so as not to protrude into an area on the dimming sheet that is more inward than the target connection area. According to the above configuration, the auxiliary structure and the attachment member can be covered and concealed by a member similar to that used in the prior art for concealing the target connection region.

[0021] [Aspect 6] A dimming board described in any one of [Aspect 1] to [Aspect 5], wherein, when viewed from a position opposite the surface of the dimming sheet, the target connection area is located along the outer edge of the dimming sheet, the length of the auxiliary structure in a first direction in which the outer edge extends is 5 mm or more and 50 mm or less, and the length of the auxiliary structure in a second direction perpendicular to the first direction is 5 mm or more. According to the above configuration, the adhesive strength of the attachment member to the transparent plate in the auxiliary structure can be suitably obtained.

[0022] [Aspect 7] A dimming panel according to any one of [Aspect 1] to [Aspect 6], wherein the area defined by the auxiliary structure has a rectangular shape when viewed from a position opposite the surface of the dimming sheet. According to the above configuration, the auxiliary structure can be easily designed.

[0023] [Aspect 8] A dimming panel described in any one of [Aspect 1] to [Aspect 6], wherein the area defined by the auxiliary structure has a polygonal shape when viewed from a position opposite the surface of the dimming sheet. According to the above configuration, the auxiliary structure can be formed in a shape that makes it difficult for fingers or the like to get caught on it.

[0024] [Aspect 9] A dimming plate described in any one of [Aspect 1] to [Aspect 6], wherein the inner peripheral edge of the auxiliary structure is configured as a curve when viewed from a position opposite the surface of the dimming sheet. According to the above configuration, fingers or the like are less likely to get caught on the auxiliary structure.

[0025] [Aspect 10] A dimming plate described in any one of [Aspect 1] to [Aspect 6], wherein, when viewed from a position opposite the surface of the dimming sheet, the area partitioned by the auxiliary structure has a polygonal shape in which the corners are rounded to have curvature.

[0026] According to the above configuration, fingers etc. are less likely to get caught on the auxiliary structure. Furthermore, compared to when the auxiliary structure has corners such as right angles, the efficiency of forming the auxiliary structure using a cutting device is improved.

[0027] [Embodiment 11] A light-controlling sheet comprising a light-controlling layer containing a liquid crystal composition and a pair of transparent electrode layers, a first transparent electrode layer and a second transparent electrode layer, sandwiching the light-controlling layer, wherein the light-controlling sheet includes a first connection region to which a first wiring connection portion is connected for electrically connecting the first transparent electrode layer to a power source, and a second connection region to which a second wiring connection portion is connected for electrically connecting the second transparent electrode layer to a power source, at least one of the first connection region and the second connection region is a target connection region, and when viewed from a position facing the surface of the light-controlling sheet, the light-controlling sheet has an auxiliary structure that is a notch or hole that penetrates the light-controlling sheet in a region adjacent to the target connection region.

[0028] According to the above configuration, when attaching the light-adjusting sheet to the transparent plate, the target connection area and auxiliary structure are covered with the adhesive member, allowing the adhesive member to be fixed to the transparent plate through the auxiliary structure near the target connection area. This protects the target connection area and strengthens the fixation of the light-adjusting sheet and wiring connection portion to the transparent plate around the target connection area. This reduces peeling of the light-adjusting sheet or wiring board, cracks in the transparent electrode layer, and other problems. Furthermore, because the adhesive member can be fixed without extending to the periphery of the light-adjusting sheet, the above effects can be achieved without restrictions on the degree of freedom of the wiring connection portion or the size of the peripheral area of the light-adjusting sheet. [Effects of the Invention]

[0029] According to the present disclosure, the reliability of the structure near the wiring connection portion in a light control panel can be improved. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 1 is a diagram showing a planar structure of a light control panel according to one embodiment. [Figure 2] FIG. 2 is a diagram showing a cross-sectional structure taken along line 2-2 of FIG. [Figure 3] FIG. 3 is a diagram showing a cross-sectional structure taken along line 3-3 in FIG. [Figure 4]FIG. 4 is a diagram showing a part of a light control panel according to an embodiment. [Figure 5] FIG. 5 is a diagram showing a configuration in which a light control panel according to one embodiment is provided with a frame. [Figure 6] FIG. 6 is an enlarged view of an auxiliary structure of a light control panel according to one embodiment. [Figure 7] FIG. 7 is a diagram showing a first modified example of the auxiliary structure. [Figure 8] FIG. 8 is a diagram showing a second modified example of the auxiliary structure. [Figure 9] FIG. 9 is a diagram showing a third modified example of the auxiliary structure. [Figure 10] FIG. 10 is a diagram showing a fourth modified example of the auxiliary structure. [Figure 11] FIG. 11 is a diagram showing a fifth modified example of the auxiliary structure. [Figure 12] FIG. 12 is a diagram showing a sixth modified example of the auxiliary structure. [Figure 13] FIG. 13 is a diagram showing a cross-sectional structure of a conventional light control panel. [Figure 14] FIG. 14 is a diagram showing a cross-sectional structure of a conventional light control panel. [Figure 15] FIG. 15 is a diagram showing a cross-sectional structure of a conventional light control panel. [Figure 16] FIG. 16 is a diagram showing a cross-sectional structure of a conventional light control panel. DETAILED DESCRIPTION OF THE INVENTION

[0031] An embodiment of a light control plate and a light control sheet will be described with reference to the drawings. [Configuration of the dimming panel] 1, the light control panel 100 includes a light control unit 10 and a transparent plate 110. The light control unit 10 includes a light control sheet 11, a first wiring connection portion 51, a second wiring connection portion 52, a first attachment member 71, and a second attachment member 72. The back surface of the light control sheet 11 is attached to the transparent plate 110.

[0032] In a plan view seen from a position facing the surface of the light controlling sheet 11, the light controlling sheet 11 includes a light controlling region SL, a first connection region SA, and a second connection region SB. The light controlling region SL is a region where light transmittance is variable, and the connection regions SA and SB are regions where wiring connection portions 51 and 52 are connected. The first wiring connection portion 51 is connected to the first connection region SA, and the second wiring connection portion 52 is connected to the second connection region SB.

[0033] The two connection areas SA and SB are located at the ends of the light controlling sheet 11. For example, the light controlling sheet 11 has a substantially rectangular shape, and the two connection areas SA and SB are arranged along one side of the light controlling sheet 11. The first connection area SA and its periphery are covered by a first adhesive member 71, and the second connection area SB and its periphery are covered by a second adhesive member 72.

[0034] The transparent plate 110 is a glass substrate or a resin substrate. Examples of the transparent plate 110 include window glass installed in a building, window glass installed in a moving body such as a vehicle or an airplane, and a partition installed inside a vehicle or indoors. The surface to which the light controlling sheet 11 is attached may be flat or curved.

[0035] In the above plan view, the transparent plate 110 is approximately the same size as the light controlling sheet 11 or slightly larger than the light controlling sheet 11. In addition, in the above plan view, the first wiring connection portion 51 and the second wiring connection portion 52 extend to the outside of the light controlling sheet 11 and the transparent plate 110. The transparent plate 110 may be fitted into a frame that surrounds the transparent plate 110. For example, if the transparent plate 110 is window glass, a frame that is a sash is located on the outer periphery of the transparent plate 110.

[0036] Fig. 2 is a cross-sectional view taken along line 2-2 in Fig. 1, and Fig. 3 is a cross-sectional view taken along line 3-3 in Fig. 1. First, the layer structure of the light controlling sheet 11 will be described with reference to Figs.

[0037] The light-controlling sheet 11 includes a light-controlling layer 20, a first transparent electrode layer 31, a second transparent electrode layer 32, a first transparent support layer 41, and a second transparent support layer 42. The light-controlling layer 20 is sandwiched between the first transparent electrode layer 31 and the second transparent electrode layer 32 and is in contact with these transparent electrode layers 31 and 32. The first transparent support layer 41 supports the first transparent electrode layer 31 on the side opposite the light-controlling layer 20 with respect to the first transparent electrode layer 31, and the second transparent support layer 42 supports the second transparent electrode layer 32 on the side opposite the light-controlling layer 20 with respect to the second transparent electrode layer 32.

[0038] The surface of the first transparent support layer 41 opposite the first transparent electrode layer 31 is the front surface of the light-controlling sheet 11, and the surface of the second transparent support layer 42 opposite the second transparent electrode layer 32 is the back surface of the light-controlling sheet 11. The region in which the light-controlling layer 20 is sandwiched between the first transparent electrode layer 31 and the second transparent electrode layer 32 is the light-controlling region SL, and in the light-controlling region SL, the first transparent support layer 41, the first transparent electrode layer 31, the light-controlling layer 20, the second transparent electrode layer 32, and the second transparent support layer 42 are arranged in this order from the front surface to the back surface of the light-controlling sheet 11.

[0039] The back surface of the light controlling sheet 11 is attached to the transparent plate 110 via an adhesive layer 90. In other words, the adhesive layer 90 is located between the back surface of the light controlling sheet 11 and the transparent plate 110, and is bonded to both the back surface and the transparent plate 110. The adhesive layer 90 is one of the components of the light controlling unit 10.

[0040] The detailed structure of each layer is described below. The light-controlling layer 20 includes a transparent polymer layer and a liquid crystal composition. The transparent polymer layer has voids, which are filled with the liquid crystal composition. The shape of the voids is spherical, ellipsoidal, or irregular.

[0041] The liquid crystal retention structure of the light-controlling layer 20 is either a polymer network type, a polymer dispersion type, or an capsule type. The polymer network type light-controlling layer 20 has a polymer network with a three-dimensional mesh structure. The polymer network is an example of a transparent polymer layer, and the liquid crystal composition is retained in the interconnected voids of the polymer network. The polymer dispersion type light-controlling layer 20 has a transparent polymer layer that defines a large number of isolated voids, and the liquid crystal composition is retained in the voids dispersed in the transparent polymer layer. The capsule type light-controlling layer 20 retains the liquid crystal composition in the voids within capsules dispersed in the transparent polymer layer.

[0042] The transparent polymer layer is a polymer of a photopolymerizable compound. The photopolymerizable compound is, for example, an ultraviolet-polymerizable compound. The ultraviolet-polymerizable compound is, for example, an acrylate compound such as butyl ethyl acrylate or cyclohexyl acrylate, a methacrylate compound such as N,N-dimethylaminoethyl methacrylate or phenoxyethyl methacrylate, a stilbene compound, a diacrylate compound, a dimethacrylate compound, a triacrylate compound, a trimethacrylate compound, a tetraacrylate compound, a tetramethacrylate compound, or an oligomer of each of these compounds. The proportion of the transparent polymer layer to the total mass of the light-controlling layer 20 is preferably 20% by mass or more and 80% by mass or less.

[0043] The liquid crystal composition contains, for example, a liquid crystal compound having positive dielectric anisotropy, that is, the dielectric constant of the liquid crystal compound in the long axis direction is greater than the dielectric constant of the liquid crystal compound in the short axis direction. The liquid crystal compound is, for example, a Schiff base-based, azo-based, azoxy-based, biphenyl-based, terphenyl-based, benzoate ester-based, tolan-based, pyrimidine-based, pyridazine-based, cyclohexanecarboxylic acid ester-based, phenylcyclohexane-based, biphenylcyclohexane-based, dicyanobenzene-based, naphthalene-based, or dioxane-based compound.

[0044] In addition to the liquid crystal compound, the liquid crystal composition may contain a dichroic dye, a viscosity reducing agent, an antifoaming agent, an antioxidant, a weathering agent, etc. Examples of the weathering agent include an ultraviolet absorber and a light stabilizer. The photochromic layer 20 may also include spacers dispersed throughout the transparent polymer layer. The spacers define the thickness of the photochromic layer 20 around the spacers, thereby making the thickness of the photochromic layer 20 uniform. The spacers may be bead spacers or photospacers formed by exposing and developing a photoresist. The spacers may or may not be light-transmitting.

[0045] Each of the first transparent electrode layer 31 and the second transparent electrode layer 32 is conductive and transparent to light in the visible region. Examples of materials for the transparent electrode layers 31 and 32 include indium tin oxide, fluorine-doped tin oxide, tin oxide, zinc oxide, carbon nanotubes, poly(3,4-ethylenedioxythiophene), silver, and silver alloys.

[0046] Each of the first transparent support layer 41 and the second transparent support layer 42 is a base material that is transparent to light in the visible region. The material of the transparent support layers 41, 42 is, for example, a synthetic resin or an inorganic compound. Examples of synthetic resins include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyacrylates such as polymethyl methacrylate, polycarbonates, and polyolefins. Examples of inorganic compounds include silicon dioxide, silicon oxynitride, and silicon nitride.

[0047] The adhesive layer 90 is transparent to light in the visible region. The adhesive layer 90 has adhesive properties. Alternatively, the adhesive layer 90 may have tackiness. Examples of materials for the adhesive layer 90 include polyolefin resins, polystyrene resins, polyamide resins, polyester resins, polyvinyl resins, polycarbonate resins, polyacrylate resins, polyurethane resins, and silicone resins.

[0048] The adhesive layer 90 may be self-adhesive. The self-adhesive property allows the light controlling sheet 11 to be peeled off from the transparent plate 110 due to external stress and to be re-adhered to the transparent plate 110 due to the adhesive property of the adhesive layer 90 itself.

[0049] Next, the structure near the wiring connections 51, 52 will be described. As shown in FIG. 2, the first transparent support layer 41 and the first transparent electrode layer 31 extend from the light control region SL to the first connection region SA. That is, in the first connection region SA, the first transparent electrode layer 31 is exposed from the light control layer 20, the second transparent electrode layer 32, and the second transparent support layer 42. The first wiring connection 51 is connected to this exposed surface of the first transparent electrode layer 31. The adhesive layer 90 is not disposed in the first connection region SA, and at the boundary between the light control region SL and the first connection region SA, the end faces of the light control layer 20, the second transparent electrode layer 32, the second transparent support layer 42, and the adhesive layer 90 are aligned in the thickness direction.

[0050] 3, the second transparent support layer 42 and the second transparent electrode layer 32 extend from the light control region SL to the second connection region SB. That is, in the second connection region SB, the second transparent electrode layer 32 is exposed from the light control layer 20, the first transparent electrode layer 31, and the first transparent support layer 41. The second wiring connection portion 52 is connected to the exposed surface of the second transparent electrode layer 32. The adhesive layer 90 also extends from the light control region SL to the second connection region SB.

[0051] The first wiring connection portion 51 includes a first wiring substrate 53 and a first conductive adhesive layer 54, and the first conductive adhesive layer 54 is bonded to the first transparent electrode layer 31 and the first wiring substrate 53 between them. This fixes the first wiring connection portion 51 to the first transparent electrode layer 31, and establishes electrical continuity between the first transparent electrode layer 31 and the wiring region of the first wiring substrate 53. A first wiring 57 is connected to the wiring region of the first wiring substrate 53.

[0052] Similarly, the second wiring connection portion 52 includes a second wiring substrate 55 and a second conductive adhesive layer 56, and the second conductive adhesive layer 56 is bonded to the second transparent electrode layer 32 and the second wiring substrate 55 between them. This fixes the second wiring connection portion 52 to the second transparent electrode layer 32, establishing electrical continuity between the second transparent electrode layer 32 and the wiring region of the second wiring substrate 55. A second wiring 58 is connected to the wiring region of the second wiring substrate 55.

[0053] The wiring boards 53 and 55 are, for example, flexible printed circuits (FPCs). The conductive adhesive layers 54 and 56 are, for example, formed of an anisotropic conductive film (ACF), an anisotropic conductive paste (ACP), an isotropic conductive film (ICF), an isotropic conductive paste (ICP), or the like.

[0054] In addition, each of the first wiring connection portion 51 and the second wiring connection portion 52 may have a structure in which a conductive material such as a conductive tape and a conductor are joined by soldering, instead of a structure consisting of wiring substrates 53, 55 and conductive adhesive layers 54, 56.

[0055] 2, the first transparent electrode layer 31 and the first wiring connection portion 51 are covered by a first sealing portion 61. The first sealing portion 61 preferably also covers the end faces of the light control layer 20 and the second transparent electrode layer 32 that face the first connection region SA. A first adhesive member 71 is attached to the surface of the light control sheet 11, i.e., the surface of the first transparent support layer 41 opposite the first transparent electrode layer 31, so as to cover the first connection region SA and the light control region SL near the first connection region SA.

[0056] 3, the second transparent electrode layer 32 and the second wiring connection portion 52 are covered by a second sealing portion 62. The second sealing portion 62 preferably also covers the end faces of the light control layer 20 and the first transparent electrode layer 31 that face the second connection region SB. A second adhesive member 72 is attached to the upper surface of the second sealing portion 62 and the surface of the light control sheet 11 in the vicinity thereof so as to cover the second connection region SB and the light control region SL in the vicinity of the second connection region SB.

[0057] The sealing portions 61 and 62 are one of the components of the dimming unit 10. The sealing portions 61 and 62 are made of a resin such as a photocurable resin or a thermosetting resin. Examples of the resin material for the sealing portions 61 and 62 include a polyacrylate resin, an epoxy resin, an allyl resin, a polyurethane resin, and a silicone resin.

[0058] The attachment members 71, 72 are strip-shaped structures having an attachment surface that is an adhesive or sticky surface. The attachment members 71, 72 are attached to the light-controlling sheet 11 so that the attachment surface is in contact with the light-controlling sheet 11. For example, the attachment members 71, 72 have a support layer and an attachment layer laminated on the support layer, and the attachment layer has adhesive or sticky properties. The material of the attachment layer is, for example, a rubber-based adhesive, an acrylic-based adhesive, a urethane-based adhesive, or a silicone-based adhesive. The material of the support layer is not particularly limited, and may be a resin base material or a fiber base material. It is preferable to use a material that has sufficient strength and bonding power as well as excellent weather resistance for the attachment members 71, 72. For example, adhesive tape such as waterproof tape or polyimide tape is preferably used.

[0059] The operation of the light controlling sheet 11 will now be described. The transparent electrode layers 31 and 32 are electrically connected to a power supply via wiring connection parts 51 and 52 and wiring 57 and 58. The power supply applies a driving voltage, which is an AC voltage, to the transparent electrode layers 31 and 32 to change the alignment state of the liquid crystal compound.

[0060] The light controlling sheet 11 switches between a transparent state and an opaque state based on a change in the alignment state of the liquid crystal compound. The transparent state is a state in which the light transmittance, i.e., the parallel ray transmittance, is relatively high, and the opaque state is a state in which the light transmittance is relatively low. The transparent state is a state in which the haze is relatively low, and the opaque state is a state in which the haze is relatively high.

[0061] When no driving voltage is applied, the orientation of the long axes of the liquid crystal compounds is irregular. Therefore, due to the birefringence of the liquid crystal compounds and the difference in refractive index between the liquid crystal compounds and the transparent polymer layer, light incident on the light-controlling sheet 11 is scattered in various directions by the light-controlling layer 20. Therefore, when no driving voltage is applied, the light-controlling sheet 11 is in an opaque state.

[0062] When the liquid crystal compound has a positive dielectric anisotropy, the liquid crystal compound is oriented such that its long axis is aligned with the electric field when a driving voltage is applied. That is, the liquid crystal compound changes its orientation so that its long axis is aligned with the thickness direction of the light-controlling layer 20. As a result, light scattering in the light-controlling layer 20 is suppressed, and light is more easily transmitted through the light-controlling sheet 11. Therefore, the light-controlling sheet 11 is in a transparent state when a driving voltage is applied.

[0063] Furthermore, the layer structure of the light-adjusting sheet 11 may be different from the above-described structure, as long as the light-adjusting sheet 11 is configured to be switched between a transparent state and an opaque state based on a change in the orientation state of the liquid crystal compound due to the application of a driving voltage.

[0064] For example, the light-controlling sheet 11 may include a pair of alignment layers sandwiching the light-controlling layer 20 between the light-controlling layer 20 and the transparent electrode layers 31 and 32. The alignment layers are layers that control the alignment of the liquid crystal compound contained in the light-controlling layer 20. The liquid crystal composition contained in the light-controlling layer 20 may also include a liquid crystal compound with negative dielectric anisotropy. For example, if the alignment layers are vertical alignment films and the liquid crystal compound has negative dielectric anisotropy, the light-controlling sheet will be transparent when no driving voltage is applied to the transparent electrode layers 31 and 32, and will be opaque when a driving voltage is applied to the transparent electrode layers 31 and 32.

[0065] [Detailed structure around the attached parts] The structure of the light controlling sheet 11 at the portions where the attachment members 71 and 72 are attached will be described in detail with reference to Fig. 4. Fig. 4 shows the light controlling unit 10 and the transparent plate 110 in a state where the attachment members 71 and 72 are not attached.

[0066] As shown in FIG. 4, the light controlling sheet 11 has two first auxiliary structures 81 adjacent to the first connection region SA and two second auxiliary structures 82 adjacent to the second connection region SB. The auxiliary structures 81, 82 are rectangular cutouts provided at the end of the light controlling sheet 11. The two first auxiliary structures 81 sandwich the first connection region SA along the direction in which the outer edge of the light controlling sheet 11 extends in the first connection region SA. The two second auxiliary structures 82 sandwich the second connection region SB along the direction in which the outer edge of the light controlling sheet 11 extends in the second connection region SB.

[0067] The auxiliary structures 81, 82 are configured so that the outer edges of the light controlling sheet 11 are partially recessed, and all layers of the light controlling sheet 11 that constitute the light controlling region SL and the adhesive layer 90 are removed from the auxiliary structures 81, 82. The surface of the transparent plate 110 is exposed in the area defined by the auxiliary structures 81, 82, i.e., the area within the auxiliary structures 81, 82. The area within the auxiliary structures 81, 82 is connected to the outer peripheral area of the light controlling sheet 11. Note that part of the area within the auxiliary structures 81, 82 may be filled with a sealant that seals the edge face of the light controlling sheet 11 along the outer edge of the light controlling sheet 11.

[0068] 1, the first adhesive member 71 covers the first connection area SA and the two first auxiliary structures 81. The second adhesive member 72 covers the second connection area SB and the two second auxiliary structures 82. The first adhesive member 71 and the second adhesive member 72 may be connected to each other. In other words, the first adhesive member 71 and the second adhesive member 72 may form a single strip-shaped member.

[0069] As described above, since the surface of the transparent plate 110 is exposed in the auxiliary structures 81 and 82, the first adhesive member 71 is fixed directly to the surface of the transparent plate 110 in the first auxiliary structure 81. Similarly, the second adhesive member 72 is fixed directly to the surface of the transparent plate 110 in the second auxiliary structure 82. It is preferable that the adhesive members 71 and 72 do not protrude beyond the outer periphery of the light controlling sheet 11. In other words, it is preferable that the adhesive members 71 and 72 are in direct contact with the surface of the transparent plate 110 only in the auxiliary structures 81 and 82.

[0070] According to the above configuration, the first adhesive member 71 covering the first connection area SA is fixed to the transparent plate 110 on both sides of the first connection area SA. Therefore, even if a force is applied to the first wiring connection part 51 in a direction away from the transparent plate 110, the first adhesive member 71 holds down the first connection area SA, thereby preventing the first transparent electrode layer 31 from bending and cracking, and preventing the light controlling sheet 11 from peeling off from the transparent plate 110 near the first connection area SA.

[0071] Similarly, because the second adhesive member 72 covering the second connection area SB is fixed to the transparent plate 110 on both sides of the second connection area SB, the second connection area SB is held down by the second adhesive member 72 even if a force is applied to the second wiring connection part 52 in a direction away from the transparent plate 110. This prevents the second wiring board 55 from peeling off from the second transparent electrode layer 32 and the light controlling sheet 11 from peeling off from the transparent plate 110 in or near the second connection area SB.

[0072] In this embodiment, the attachment members 71, 72 are fixed to the transparent plate 110 via the auxiliary structures 81, 82, and therefore the attachment of the light adjusting unit 10 to the transparent plate 110 in the vicinity of the connection areas SA, SB can be strengthened as described above without extending the attachment members 71, 72 to the outer periphery of the light adjusting sheet 11. This ensures flexibility in the configuration of the wiring connection parts 51, 52 on the outer periphery of the light adjusting sheet 11. Furthermore, even if the area where the transparent plate 110 is exposed on the outer periphery of the light adjusting sheet 11 is small, the light adjusting unit 10 can be accurately fixed to the transparent plate 110.

[0073] For example, FIG. 5 shows a configuration in which the light control panel 100 includes a frame 120. The frame 120 is, for example, a sash, and surrounds the transparent panel 110. An edge portion of the transparent panel 110 along its outer edge is fitted into the frame 120. In this configuration, only a small area of the transparent panel 110 is exposed on the periphery of the light control sheet 11. Even in this case, the attachment members 71 and 72 are fixed to the transparent panel 110 via the auxiliary structures 81 and 82, so that the light control unit 10 can be accurately fixed to the transparent panel 110. As such, with the configuration of this embodiment, the fixation of the light control unit 10 to the transparent panel 110 can be strengthened near the connection areas SA and SB, regardless of the presence or absence of the frame 120.

[0074] The configuration of the auxiliary structures 81 and 82 will be further described with reference to Fig. 6. Fig. 6 shows the structure in the vicinity of the second auxiliary structure 82. The configuration of the second auxiliary structure 82 will be described below, but the configuration of the second auxiliary structure 82, such as its shape and size, also applies to the first auxiliary structure 81.

[0075] In the following, the first direction is the direction in which the outer edges of the light-adjusting sheet 11 in the portions where the connection areas SA and SB are arranged extend, and the second direction is the direction perpendicular to the first direction, in a plan view seen from a position facing the surface of the light-adjusting sheet 11. In other words, when the connection areas SA and SB are arranged along one side of the light-adjusting sheet 11, the direction in which the side extends is the first direction.

[0076] 6 is the length of second auxiliary structure 82 along the first direction. Furthermore, length L1 is the length of second auxiliary structure 82 along the second direction, and length L2 is the length of the portion of second wiring board 55 that overlaps with second connection region SB along the second direction. Length L3 is the length of second sealing portion 62 along the second direction, and length L4 is the length of second connection region SB along the second direction.

[0077] The width W1 of the second auxiliary structure 82 is not particularly limited, but is preferably 5 mm or more, and more preferably 10 mm or more, in order to obtain favorable adhesion strength of the second attaching member 72 to the transparent plate 110. On the other hand, in order to prevent the area required for forming the second auxiliary structure 82 around the second connection region SB from becoming large, the width W1 of the second auxiliary structure 82 is preferably 50 mm or less, and more preferably 20 mm or less.

[0078] The length L1 of the second auxiliary structure 82 is preferably equal to or less than the length L4 of the second connection region SB. In other words, the second auxiliary structure 82 is preferably disposed at a position that does not protrude inward from the second connection region SB in the second direction. Furthermore, the length in the second direction of the second attachment member 72 that covers the second auxiliary structure 82 is preferably equal to or less than the length L4 of the second connection region SB. Conventionally, the connection regions SA and SB have sometimes been concealed with a strip-shaped member to improve the appearance of the light control unit 10. As described above, if the second auxiliary structure 82 and the second attachment member 72 do not protrude beyond the second connection region SB in the second direction, the second auxiliary structure 82 and the second attachment member 72 can be concealed together with the second connection region SB without increasing the width of the concealing member compared to conventional methods.

[0079] The length L3 of the second sealing portion 62 may be equal to or less than the length L4 of the second connection region SB. While FIG. 6 shows the length L3 as being smaller than the length L4, the length L3 may be equal to the length L4, and the second sealing portion 62 may be located over the entire second connection region SB. The length L2 of the second wiring substrate 55 may be equal to or greater than the length L1 of the second auxiliary structure 82, or may be equal to or smaller than the length L1 of the second auxiliary structure 82. The length L1 of the second auxiliary structure 82, like the width W1, is preferably equal to or greater than 5 mm, and more preferably equal to or greater than 10 mm.

[0080] There is no particular limitation on the size of the gap along the first direction between the second connection region SB and the second auxiliary structure 82. It is preferable that the second auxiliary structure 82 be disposed close to the second connection region SB to the extent that the formation of the second auxiliary structure 82 does not affect the second connection region SB.

[0081] The light controlling sheet 11 of this embodiment is manufactured, for example, by cutting into a desired shape a large sheet that is a laminate made up of the constituent layers and adhesive layers of the light controlling sheet 11. Then, by removing parts of the constituent layers, connection areas SA and SB are formed, and by cutting out parts of the sheet, auxiliary structures 81 and 82 are formed. After that, wiring connection parts 51 and 52 are attached to the connection areas SA and SB, and the light controlling sheet 11 is attached to the transparent plate 110. Furthermore, by attaching attachment members 71 and 72, the light controlling unit 10 and the light controlling plate 100 are formed.

[0082] [Variations] 7 to 12, modified shapes of the auxiliary structures 81 and 82 will be described. Below, the configuration of the second auxiliary structure will be described for each modified shape, but the configuration of the shape, size, etc. of the second auxiliary structure of each modified shape is also applied to the first auxiliary structure.

[0083] 7 shows the second auxiliary structure 83 of the first modified example. The second auxiliary structure 83 is a trapezoidal cutout, and the width of the second auxiliary structure 83 along the first direction gradually increases in the direction toward the outer periphery of the light controlling sheet 11 along the second direction.

[0084] In each modification, when the width of the second auxiliary structure 83 along the first direction is not constant, the width W1 of the second auxiliary structure 83 indicates the maximum width of the second auxiliary structure 83 along the first direction. Similarly, when the length of the second auxiliary structure 83 along the second direction is not constant, the length L1 of the second auxiliary structure 83 indicates the maximum length of the second auxiliary structure 83 along the second direction. The lengths L2, L3, and L4 may also be the maximum length of each portion along the second direction. In the first modification, the conditions relating to the width W1 and the lengths L1, L2, L3, and L4 are the same as those in the case of the second auxiliary structure 82 described above.

[0085] Furthermore, the second auxiliary structure 83 may be a polygon such as a triangle, which is different from a rectangle or a trapezoid. If the width of the second auxiliary structure 83 along the first direction gradually increases toward the periphery of the light controlling sheet 11, other members, fingers, etc. are prevented from getting caught on the second auxiliary structure 83 during transportation or installation of the light controlling sheet 11. This prevents deformation or damage to the second auxiliary structure 83 before the second attachment member 72 is attached.

[0086] 8 shows a second auxiliary structure 84 of the second modified example. The second auxiliary structure 84 is a semi-elliptical cutout with the second direction as its major axis, and the width of the second auxiliary structure 84 along the first direction gradually increases in the direction toward the outer periphery of the light controlling sheet 11 along the second direction. In the second modified example, the conditions related to the width W1 and lengths L1, L2, L3, and L4 are the same as those for the second auxiliary structure 82 described above.

[0087] Furthermore, the second auxiliary structure 84 may be semicircular, or may have a shape defined by a curve other than a semicircle or an ellipse. As in the first modified example, if the width of the second auxiliary structure 84 along the first direction gradually increases toward the outer periphery of the light controlling sheet 11, other members, fingers, etc. are prevented from getting caught on the second auxiliary structure 84. Furthermore, if the inner peripheral edge of the second auxiliary structure 84 is configured with a curve, other members, fingers, etc. are further prevented from getting caught on the second auxiliary structure 84 compared to when the second auxiliary structure has a shape with corners. Therefore, deformation or damage to the second auxiliary structure 84 is more preferably prevented before the second attachment member 72 is attached.

[0088] FIG. 9 shows a second auxiliary structure 85 of a third modified example. The second auxiliary structure 85 is a rectangular cutout with rounded corners that have curvature. In detail, the four corners of the second auxiliary structure 85, namely, the two corners located at the bottom of the cutout and the two corners adjacent to the outer peripheral region of the light controlling sheet 11, have curvature. In the third modified example, the conditions related to the width W1 and lengths L1, L2, L3, and L4 are the same as those for the second auxiliary structure 82 described above.

[0089] Furthermore, the second auxiliary structure 85 may have a polygonal shape other than a rectangle with rounded corners. The curvature of the corners prevents other members, fingers, etc. from getting caught on the second auxiliary structure 85 when transporting or applying the light controlling sheet 11, and also prevents the corners from becoming a starting point for damage. This prevents deformation or damage to the second auxiliary structure 85 before the second attachment member 72 is attached.

[0090] Furthermore, if the corners have a curvature, continuous processing is possible when forming the second auxiliary structure 85 using a cutting device without the need for abrupt changes in the cutting direction, thereby improving production efficiency.

[0091] 10 shows a second auxiliary structure 86 of a fourth modified example. The second auxiliary structure 86 is a hole that penetrates the light controlling sheet 11, and the area inside the second auxiliary structure 86 is not connected to the outer periphery of the light controlling sheet 11. The second auxiliary structure 86 is a hexagonal hole. The second auxiliary structure 86 may have a polygonal shape other than a hexagon, such as a rectangle.

[0092] When the second auxiliary structure 86 is a hole, the length L1 indicates the length along the second direction from the outer edge of the light controlling sheet 11 to the position on the second auxiliary structure 86 that is farthest from the outer edge. Furthermore, the length L5 indicates the length along the second direction from the outer edge of the light controlling sheet 11 to the position on the second auxiliary structure 86 that is closest to the outer edge. In the fourth modification, the conditions for the width W1 and the lengths L1, L2, L3, and L4 are the same as those for the second auxiliary structure 82 described above. However, with regard to the value of the length L1, it is preferable that the difference between the lengths L1 and L5, i.e., the diameter along the second direction of the hole that is the second auxiliary structure 86, is 5 mm or more. It is also preferable that the length L5 is 2 mm or more.

[0093] As in the fourth modified example, even if the second auxiliary structure 86 is a hole, the second adhesive member 72 is fixed directly to the transparent plate 110 through the second auxiliary structure 86, thereby strengthening the fixation of the dimming unit 10 to the transparent plate 110 near the second connection area SB.

[0094] Furthermore, even if the second auxiliary structure 86 is a hole, as long as the second auxiliary structure 86 and the second adhesive member 72 do not protrude beyond the second connection area SB in the second direction, it is easily possible to cover and conceal the second auxiliary structure 82 and the second adhesive member 72 together with the second connection area SB.

[0095] If the second auxiliary structure 86 is a hole, it is possible to prevent other components, fingers, etc. from entering and getting caught on the second auxiliary structure 86 from the outside when transporting or installing the light-controlling sheet 11. In addition, since the outer edge of the light-controlling sheet 11 is straight and not recessed, the light-controlling sheet 11 can be easily handled.

[0096] 11 shows a second auxiliary structure 87 of a fifth modified example. As in the fourth modified example, the second auxiliary structure 87 is a hole that penetrates the light controlling sheet 11, and the area inside the second auxiliary structure 87 is not connected to the outer peripheral area of the light controlling sheet 11. In the fifth modified example, the second auxiliary structure 87 is an elliptical hole. The second auxiliary structure 87 may be circular or may have a shape defined by a curve other than a circle or an ellipse.

[0097] In the fifth modified example, the conditions relating to the width W1 and the lengths L1, L2, L3, L4, and L5 are the same as those in the fourth modified example. In the fifth variant, the inner peripheral edge of the second auxiliary structure 87 is curved and the second auxiliary structure 87 has no corners, which more effectively prevents other components, fingers, etc. from getting caught on the second auxiliary structure 87.

[0098] 12 shows a second auxiliary structure 88 of a sixth modified example. As in the fourth modified example, the second auxiliary structure 88 is a hole that penetrates the light controlling sheet 11, and the area inside the second auxiliary structure 88 is not connected to the outer periphery of the light controlling sheet 11. In the sixth modified example, the second auxiliary structure 88 is a rectangular hole with rounded corners that have curvature. The second auxiliary structure 88 may also have a polygonal shape other than a rectangle with rounded corners.

[0099] In the sixth modified example, the conditions relating to the width W1 and the lengths L1, L2, L3, L4, and L5 are the same as those in the fourth modified example. In the sixth variant, the corners of the second auxiliary structure 88 have a curvature, which more effectively prevents other components, fingers, etc. from getting caught on the second auxiliary structure 88, and also makes it possible to improve production efficiency.

[0100] Other variations will be described below. The shapes of the two first auxiliary structures may be different from each other, and the shapes of the two second auxiliary structures may be different from each other. The shapes of the first auxiliary structures and the second auxiliary structures may be different from each other. The number of first auxiliary structures may be one, and the number of second auxiliary structures may be one. That is, the first auxiliary structure may be provided in only one of the areas sandwiching the first connection area SA, or the second auxiliary structure may be provided in only one of the areas sandwiching the second connection area SB. Parts of the connection areas SA and SB may be exposed from the attachment members 71 and 72, or part of the auxiliary structures may be exposed from the attachment members. Only one of the first auxiliary structure and the second auxiliary structure may be provided.

[0101] As described above, according to this embodiment, the following effects can be obtained. (1) The adhesive member covering the connection area is fixed to the transparent plate near the connection area via the auxiliary structure. This protects the connection area and strengthens the fixation of the light-controlling sheet and wiring connection portion to the transparent plate around the connection area. This reduces peeling of the light-controlling sheet or wiring connection portion, cracks in the transparent electrode layer, and other problems. This increases the reliability of the structure near the wiring connection portion. Furthermore, since the adhesive member can be fixed without extending to the periphery of the light-controlling sheet, the above effects can be achieved without being restricted by the degree of freedom of the wiring connection portion or the size of the peripheral area of the light-controlling sheet.

[0102] (2) If the auxiliary structure is a notch, it is easy to form the auxiliary structure. (3) If the auxiliary structure is a hole, the outer shape of the light-controlling sheet does not change from when the auxiliary structure is not formed, making the light-controlling sheet easier to handle.

[0103] (4) If two auxiliary structures sandwich the connection area along the direction of the outer edge of the light-controlling sheet in the connection area, the attachment members are fixed to the transparent plate through the auxiliary structures on both sides of the connection area, thereby further strengthening the fixation of the light-controlling sheet and the wiring connection parts to the transparent plate in and around the connection area.

[0104] (5) In the direction perpendicular to the outer edge of the light controlling sheet in the connection area, the auxiliary structure is positioned so as not to protrude into an area inside the connection area. With this configuration, the auxiliary structure and the attachment member can be concealed by a member similar to that used in the past for concealing the connection area.

[0105] (6) In the direction in which the outer edge of the light-controlling sheet extends in the connection region, the length of the auxiliary structure is 5 mm to 50 mm, and the length of the auxiliary structure in the direction perpendicular to the outer edge is 5 mm or more. With this configuration, the auxiliary structure can provide favorable adhesion strength between the attachment member and the transparent plate.

[0106] (7) If the area defined by the auxiliary structure has a rectangular shape, the auxiliary structure can be easily designed. (8) If the area defined by the auxiliary structure has a polygonal shape, the auxiliary structure can be made to have a shape that makes it difficult for fingers or the like to get caught in.

[0107] (9) If the inner peripheral edge of the auxiliary structure is configured with a curve, fingers etc. are less likely to get caught on the auxiliary structure. (10) If the area defined by the auxiliary structure has a polygonal shape with rounded corners that have curvature, fingers or the like are less likely to get caught in the auxiliary structure. Furthermore, compared to when the auxiliary structure has corners that are right angles or the like, the efficiency of forming the auxiliary structure using a cutting device is improved. [Explanation of symbols]

[0108] SA, SB...Connection area SL…Dimmer area 10...Dimming unit 11...Light-adjusting sheet 20...Photochromic layer 31,32...Transparent electrode layer 41,42...Transparent support layer 51, 52...Wiring connection parts 61, 62...Sealing section 71, 72...Attachment members 81,82…Auxiliary structure part 100...Dimmer 110...Transparent plate

Claims

1. a light-controlling sheet including a light-controlling layer containing a liquid crystal composition and a pair of transparent electrode layers, a first transparent electrode layer and a second transparent electrode layer, sandwiching the light-controlling layer; a first wiring connection portion for electrically connecting the first transparent electrode layer to a power source; a second wiring connection portion for electrically connecting the second transparent electrode layer to a power source; a transparent plate to which the back surface of the light controlling sheet is attached, the light controlling sheet has a first connection region to which the first wiring connection portion is connected and a second connection region to which the second wiring connection portion is connected, and at least one of the first connection region and the second connection region is a target connection region; When viewed from a position facing the surface of the light-controlling sheet, the light-controlling sheet has an auxiliary structure that is a notch or a hole that penetrates the light-controlling sheet in an area adjacent to the target connection area, An attachment member attached to a surface of the light-controlling sheet, the attachment member covering the target connection area and the auxiliary structure and fixed to the transparent plate through the auxiliary structure. Dimmer board.

2. When viewed from a position facing the surface of the light-controlling sheet, the auxiliary structure is a notch in which the outer edge of the light-controlling sheet is recessed. The dimming panel according to claim 1 .

3. When viewed from a position facing the surface of the light-controlling sheet, the auxiliary structure is a hole penetrating the light-controlling sheet. The dimming panel according to claim 1 .

4. When viewed from a position facing the surface of the light controlling sheet, the target connection area is located along the outer edge of the light controlling sheet, and the light controlling sheet has two auxiliary structures that are arranged on either side of the target connection area along the extension direction of the outer edge of the light controlling sheet in the target connection area. The dimming panel according to claim 1 .

5. When viewed from a position facing the surface of the light-adjusting sheet, the target connection area is located along the outer edge of the light-adjusting sheet, and in a direction perpendicular to the outer edge, the auxiliary structure is arranged at a position that does not protrude into an area of the light-adjusting sheet that is more inward than the target connection area. The dimming panel according to claim 1 .

6. When viewed from a position facing the surface of the light-adjusting sheet, the target connection area is located along the outer edge of the light-adjusting sheet, and the length of the auxiliary structure in a first direction, which is the direction in which the outer edge extends, is 5 mm to 50 mm, and the length of the auxiliary structure in a second direction perpendicular to the first direction is 5 mm or more. The dimming panel according to claim 1 .

7. When viewed from a position facing the surface of the light-controlling sheet, the area defined by the auxiliary structure has a rectangular shape. The dimming panel according to claim 1 .

8. When viewed from a position facing the surface of the light-controlling sheet, the area defined by the auxiliary structure has a polygonal shape. The dimming panel according to claim 1 .

9. When viewed from a position facing the surface of the light-controlling sheet, the inner periphery of the auxiliary structure is configured as a curve. The dimming panel according to claim 1 .

10. When viewed from a position facing the surface of the light-controlling sheet, the area defined by the auxiliary structure has a polygonal shape with rounded corners having curvature. The dimming panel according to claim 1 .

11. a light-controlling layer containing a liquid crystal composition; A light-controlling sheet comprising a pair of transparent electrode layers, a first transparent electrode layer and a second transparent electrode layer, sandwiching the light-controlling layer, the light-adjusting sheet includes a first connection region to which a first wiring connection portion is connected for electrically connecting the first transparent electrode layer and a power source, and a second connection region to which a second wiring connection portion is connected for electrically connecting the second transparent electrode layer and a power source, At least one of the first connection region and the second connection region is a target connection region, and when viewed from a position facing the surface of the light controlling sheet, the light controlling sheet has an auxiliary structure that is a notch or a hole that penetrates the light controlling sheet in an area adjacent to the target connection region. Dimming sheet.

Images