Flexible base material, color changing device and terminal product

Abstract

The utility model relates to the technical field of electrochromism, in particular to a flexible base material, a color changing device and a terminal product, the flexible base material comprises at least one film area, the actual perimeter is S1 when the film area is unfolded into a plane, and the curved surface perimeter is S2 when the film area is bent into a curved surface; s1 is obtained by subtracting S2 from S1 of at least one membrane area, and S1 / S2 is smaller than or equal to 0.0015; and / or at least one film area S1 / S2 is greater than 0.0015, the film area with S1 / S2 greater than 0.0015 is provided with a cutting part, one end of the cutting part extends to the edge of the film area, the other end of the cutting part extends to the middle part of the film area, the opening length of the cutting part at the edge of the film area is L1, L1 is greater than or equal to (S1-1.0015S2), the actual perimeter is the perimeter when the film area is unfolded into a plane before the cutting part is formed, and the actual perimeter is greater than or equal to (S1-1.0015S2). And the circumference of the curved surface is the circumference when the membrane area is bent into the curved surface before being provided with the cutting part. The problem that the appearance function of the device is affected by wrinkles generated on the edge when the flexible base material is attached to the curved-surface device is solved.

Description

Technical Field

[0001] The present application relates to the field of electrochromic technology, and more specifically to a flexible substrate, a color-changing device, and a terminal product. Background Art

[0002] When producing some products with specific functions, it is necessary to attach functional films on the surface of the products to achieve dimming or heat insulation effects. Functional films are usually directly laminated through the PVB interlayer lamination process to form products. The products can be glass products.

[0003] For example, when a functional film needs to be applied to glass with a large curvature (arch height), wrinkles will usually be generated at the edge, which will affect the appearance of the entire device and even directly cause the device to fail. In particular, when the functional film is applied to a product with a large curvature, deep wrinkles will be generated at the edge and extend to the middle, resulting in a reduction in the visible area of ​​the film. Therefore, the existing technology has the problem of wrinkles being easily generated at the edge. Utility Model Content

[0004] The purpose of the present application is to provide a flexible substrate, a color-changing device and a terminal product, aiming to solve the technical problem in the prior art that wrinkles are generated at the edges of a curved device when the substrate is attached to the device, thus affecting the appearance and even the function of the device.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: in the first aspect, a flexible substrate is provided, the flexible substrate comprises at least one membrane area, the actual perimeter of the membrane area when unfolded into a plane is S1, and the perimeter of the curved surface when bent into a curved surface is S2;

[0006] The flexible substrate comprises at least one membrane region, the actual perimeter of the membrane region when unfolded into a plane is S1, and the perimeter of the curved surface when bent into a curved surface is S2;

[0007] Wherein, S1 of at least one of the film regions is subtracted from S2 to obtain △S1, and △S1 / S2 is less than or equal to 0.0015; and / or, △S1 / S2 of at least one of the film regions is greater than 0.0015, and a cut-off portion penetrating the thickness direction of the film region is provided on the film region where △S1 / S2 is greater than 0.0015, and one end of the cut-off portion extends to the edge of the film region, and the other end extends to the middle of the film region, and the opening length of the cut-off portion extending along the edge direction of the film region at the edge of the film region is L1, then L1 is greater than or equal to (S1-1.0015S2);

[0008] The actual circumference is the circumference of the membrane area when it is unfolded into a plane before the cut-off portion is opened, and the curved surface circumference is the circumference of the membrane area when it is bent into a curved surface before the cut-off portion is opened.

[0009] Therefore, the effect of the flexible substrate provided in the present application is that it solves the technical problem of wrinkles at the edges of the film area when it is attached to a curved product.

[0010] In one embodiment of the first aspect, the curved surface perimeter is the contour perimeter of the attachment area formed when the film area is attached to the surface of the curved product.

[0011] In one embodiment of the first aspect, L1 is less than or equal to (S1-1.0015S2)+10 mm.

[0012] In one embodiment of the first aspect, L1 is less than or equal to (S1-1.0015S2)+5 mm.

[0013] In one embodiment of the first aspect, L1 is less than or equal to (S1-1.0015S2)+2 mm.

[0014] In one embodiment of the first aspect, the flexible substrate includes at least two film regions, and adjacent film regions are separated from each other.

[0015] In one embodiment of the first aspect, there is a cutting portion between adjacent film areas.

[0016] In one embodiment of the first aspect, the cutting portion is a linear structure.

[0017] In one embodiment of the first aspect, the flexible substrate comprises at least two membrane areas, adjacent membrane areas are divided by a cutting portion and have an uncut connecting segment, the actual perimeter of the membrane area is the sum of the length of the edge of the membrane area and the connecting segment, and the curved surface perimeter of the membrane area is the curved surface perimeter when the area enclosed by the actual perimeter is bent into a curved surface.

[0018] In one embodiment of the first aspect, the cutting portion is a linear structure.

[0019] In one embodiment of the first aspect, the cutout portion is a cutout, and the cutout is a planar structure and extends along the plane where the membrane area is located.

[0020] In one embodiment of the first aspect, one end of the cut-out portion extending toward the middle portion extends toward the highest point of the curved arch formed by the membrane area.

[0021] In one embodiment of the first aspect, one end of the cut-out portion extending toward the middle extends to the highest point of the curved arch formed by the entire membrane or the membrane area.

[0022] In one embodiment of the first aspect, the curvature of the line connecting the two ends of the cut-off portion along the curved surface in the length direction is H1, and the curvature of any line extending from the edge of the membrane area to the middle of the membrane area of ​​the same length is H2, and H1 is greater than H2.

[0023] In one embodiment of the first aspect, one end of the cut-off portion extending toward the middle of the membrane region is pointed.

[0024] In one of the embodiments of the first aspect, one end of the cut-off portion extending toward the middle of the membrane region is also connected to a through hole, and the through hole penetrates through the thickness direction of the membrane region.

[0025] In one of the embodiments of the first aspect, the inner wall of the through hole has at least a curved surface segment, and the projection of the curved surface segment on the flat surface is an arc when the film area is flattened.

[0026] In one embodiment of the first aspect, any one of the film areas is located at an edge portion of the flexible substrate.

[0027] In one embodiment of the first aspect, the length of the cutting portion is L2, the sum of the length of the cutting portion and the length of the connecting section is L3, and L2 / L3 is greater than 4 / 5.

[0028] In a second aspect, the present application further provides a color-changing device, to which the flexible substrate provided in any one of the above embodiments is attached.

[0029] The effect of the color-changing device provided by the present application is that, since the color-changing device includes a flexible substrate, it can achieve the corresponding functional effect, and the flexible substrate will not produce edge wrinkles when attached, will not reduce the function of the color-changing device, and will not affect the appearance.

[0030] In one embodiment of the second aspect, the color changing device has at least one curved surface portion, and the flexible substrate is attached to the curved surface portion and stacked with the curved surface portion.

[0031] In one embodiment of the second aspect, the color-changing device includes a first glass, a first adhesive layer, a second glass, and a second adhesive layer which are sequentially arranged in a stacked form, and the flexible substrate is respectively attached to the first glass and the second glass by means of the first adhesive layer and the second adhesive layer, and the first glass and the second glass are both curved glasses.

[0032] In one embodiment of the second aspect, the curved glass is further provided with a shielding coating, the shielding coating is provided corresponding to the gap between the cut-away portion and the film area, and the shielding coating is made of an opaque material.

[0033] In the third aspect, the present application also provides a terminal product, comprising the flexible substrate provided in any one of the above embodiments, or comprising the color-changing device provided in any one of the above embodiments; the terminal product is any one or more of a vehicle rearview mirror, a curtain wall, a vehicle sunroof, a vehicle side window, a vehicle windshield, an electronic product housing, glasses, a vehicle, and a display panel.

[0034] The terminal product provided in the present application is provided with a flexible substrate, which can prevent wrinkles from occurring at the edges and does not affect the use effect of the terminal product.

[0035] The flexible substrate provided by the present application has the following beneficial effects: the flexible substrate provided by the present application limits the perimeter ratio before and after unfolding to be less than a certain value, so that when the flexible substrate is bent, wrinkles will not be generated on the edges around it, thereby reducing the generation of edge wrinkles. In addition, when the perimeter ratio before and after the flexible substrate is unfolded is greater than a preset value, a cutting portion is provided to cut off the redundant part at the edge, thereby reducing the wrinkles generated at the edge. The technical problem in the prior art that wrinkles distributed at the edge affect the range of the visible area is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 It is a schematic diagram of the structure of attaching a functional film to a curved surface product in the prior art;

[0038] Figure 2 A schematic diagram of the structure of a flexible substrate provided in some embodiments of the present application when unfolded into a plane;

[0039] Figure 3 for Figure 2 A schematic diagram of a structure in which a flexible substrate is attached to a curved product and meets the condition that no wrinkles are generated on the edge;

[0040] Figure 4 A schematic diagram of the structure of a flexible substrate provided in some other embodiments of the present application when unfolded into a plane;

[0041] Figure 5 for Figure 4 A schematic diagram of a structure in which a flexible substrate is attached to a curved product and meets the condition that no wrinkles are generated on the edge;

[0042] Figure 6A schematic diagram of the structure of a flexible substrate with a cut-out portion provided in some other embodiments of the present application when unfolded into a plane;

[0043] Figure 7 for Figure 6 Schematic diagram of the structure in which the flexible substrate is attached to the curved surface product;

[0044] Figure 8 A schematic diagram of the structure of a flexible substrate with a cut-out portion provided in some other embodiments of the present application when unfolded into a plane;

[0045] Fig. 9 for Figure 8 Schematic diagram of the structure in which the flexible substrate is attached to the curved surface product;

[0046] Fig.10 for Fig. 9 A schematic diagram of the enlarged structure at A in the middle;

[0047] Fig.11 There are also some embodiments of the present application providing a schematic diagram of a structure in which a flexible substrate is attached to a curved product and a portion of the film area meets the condition that no wrinkles are generated at the edge;

[0048] Fig.12 for Fig.11 A schematic diagram of the structure when the cutting portion of the flexible substrate is completely cut;

[0049] Fig.13 for Fig.11 A schematic diagram of the structure after the flexible substrate is unfolded into a plane and a cut-away portion is provided;

[0050] Fig.14 for Fig.13 Schematic diagram of the structure in which the flexible substrate is attached to the curved surface product;

[0051] Fig.15 for Fig.11 A schematic diagram of a structure in which the flexible substrate is unfolded into a plane and another form of cut-off portion is provided;

[0052] Fig.16 for Fig.15 Schematic diagram of the structure in which the flexible substrate is attached to the curved surface product;

[0053] Fig.17 for Fig.16 A schematic diagram of the enlarged structure at B in the middle;

[0054] Fig.18 for Figure 7 Schematic diagram of the structure after setting the shielding coating;

[0055] Fig.19 for Fig.16 Schematic diagram of the structure after setting the shielding coating.

[0056] In the figure, 1, flexible substrate; 2, cut-off portion; 3, cutting portion; 4, through hole; 5, shielding coating; 6, membrane area; 7, curved surface product; 8, connecting section. DETAILED DESCRIPTION

[0057] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0058] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0060] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0061] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] It is usually necessary to attach functional films such as electrochromic films, sunscreen films, heat insulation films, etc. on the glass surface to make the glass have functions such as dimming, sunscreen, and heat insulation. When the flexible substrate 1 is laid on the surface of a curved substrate, especially when the flexible substrate 1 is laid on the surface of a hyperbolic substrate, such as Figure 1 The edges of the flexible substrate 1 shown have redundant parts and form deep wrinkles at the edges. The flexible substrate 1 includes a flexible electrochromic film, a flexible battery, a flexible heat insulation film, a flexible sunscreen film, etc. The embodiment of the present application uses a flexible electrochromic film as an embodiment to further explain the present application in detail.

[0063] like Figure 2 and Figure 4 The present application provides a specific embodiment of a flexible substrate 1. The flexible substrate 1 in this embodiment includes at least one membrane area 6. The actual circumference of the membrane area 6 when unfolded into a plane is S1, and the circumference of the curved surface when bent into a curved surface is S2.

[0064] The flexible substrate 1 may specifically be a flexible electrochromic film, comprising a first base layer, a first conductive layer, an electrochromic stacked layer, a second conductive layer and a second base layer stacked in sequence.

[0065] It should be noted that the electrochromic stacked layer can be a liquid electrochromic layer, a sol-state electrochromic layer, or a solid electrochromic layer, wherein the solid electrochromic layer can, for example, include an ion storage layer, an electrolyte layer, and an electrochromic material layer stacked in sequence.

[0066] The first bus bar and the second bus bar are arranged on both sides of the thickness direction of the edges of the flexible electrochromic film, preferably, connecting the first conductive layer and the second conductive layer respectively; the first groove and the second groove are alternately arranged around the flexible electrochromic film, the first groove penetrates the first substrate layer, the first conductive layer and the electrochromic stacking layer to expose the second conductive layer; the second groove penetrates the second substrate layer, the second conductive layer and the electrochromic stacking layer to expose the first conductive layer; the first bus bar is attached to one side of the first substrate layer and is electrically connected to the second conductive layer through the first groove, and the second bus bar is attached to one side of the second substrate layer and is electrically connected to the first conductive layer through the first groove. It is worth noting that in other embodiments, the structure of the electrochromic film can be set arbitrarily, and is not limited here.

[0067] In the flexible substrate 1 provided in this embodiment, ΔS1 is obtained by subtracting S2 from S1 of at least one film region 6, and ΔS1 / S2 is less than or equal to 0.0015.

[0068] in Figure 2 and Figure 4 The membrane area 6 in all meets the above conditions.

[0069] In this embodiment, the actual perimeter S1 is the length of the edge of the membrane area 6 after the flexible substrate 1 is unfolded into a plane, specifically, Figure 2 The circumference of the curved surface is S2, which is the circumference of the curved surface when the flexible substrate 1 is bent into a curved shape. The membrane area 6 in this embodiment can be an independent area in the flexible substrate 1, as shown in FIG. Figure 4 . It can also be an independent integral membrane, such as Figure 2 In the embodiment of the present application, the ratio of the difference between the perimeters of the opening before unfolding and the perimeter S2 before unfolding is limited to a certain value, so that when the flexible substrate 1 is bent, the edge wrinkles are reduced or even eliminated, so that when it is attached to the curved product 7, wrinkles are not generated at the edge. Figure 3 and Figure 5 Since the generation of wrinkles is reduced, there is no need to set too many shielding layers to shield the wrinkles, so the visible area of ​​the flexible substrate 1 can be increased; in addition, the damage to the substrate caused by wrinkles can be reduced, thereby increasing the life of the flexible substrate 1.

[0070] It should be noted that the curved surface perimeter is the contour perimeter of the attached area on the curved surface product 7 when the film area 6 is attached to the curved surface product 7. Figure 3 and Figure 5 The contour perimeter of the middle attachment area. At this time, the membrane area 6 is bent into a curved surface, so it can be called the curved surface perimeter. The length of the curved surface perimeter can be measured by software.

[0071] The actual circumference is Figure 2 and Figure 4 The actual edge circumference when unfolded in a flat form.

[0072] And / or, this embodiment may be improved on the basis of the above embodiments.

[0073] like Fig.11 In the provided flexible substrate 1, at least one film area 6 has a ΔS1 / S2 greater than 0.0015. When ΔS1 / S2 is greater than 0.0015, when such a film area 6 is attached to a curved product 7, more redundant parts will appear at the edge. When the product is bent, these redundant parts cannot disappear and overlap at the edge to form wrinkles. The reason is that the actual perimeter is much larger than the perimeter of the curved surface, that is, ΔS1 / S2 is greater than 0.0015.

[0074] Therefore, if Figure 6 , Figure 8 as well as Fig.13 , Fig.15 ,in Figure 6 and Figure 8In the case of having only one membrane area 6, a cutout 2 is provided on the membrane area 6 where △S1 / S2 is greater than 0.0015, which runs through the thickness direction of the membrane area 6. One end of the cutout 2 extends to one of the edges of the membrane area 6, and the other end extends to the middle of the membrane area 6. The opening length of the cutout 2 extending along the edge of the membrane area 6 at the edge of the membrane area 6 is L1, and L1 is greater than or equal to (S1-1.0015S2), that is, when the ratio of the perimeter difference to S2 is greater than 0.0015, the redundant part is cut off through the cutout 2, and the perimeter after the cutout makes the wrinkles very small and acceptable to the user. It is worth noting that in the embodiment of the present application, for ease of understanding, the actual perimeter S1 is the actual perimeter of the membrane area 6 before the cutout 2 is provided and after the plane is unfolded. Similarly, the curved surface perimeter S2 of the membrane sheet is the curved surface perimeter before the cutout 2 is provided in the membrane area 6 and after the curved surface is formed.

[0075] For example: the circumference of the flexible electrochromic film is 3964 mm, and the ratio of the circumference difference before and after flattening of the flexible electrochromic film to the circumference of the functional film curved surface is 3.2 mm / m; the incision width L1 is greater than or equal to: functional film circumference * ratio = 3.9 m * 3.2 mm / m = 12.5 mm; therefore, the incision needs to be at least 12.5 mm.

[0076] Further improvement on the above embodiment, the L1 is less than or equal to (S1-1.0015S2)+10 mm. In order to avoid the incision being too large and causing the entire curved product 7 to be unable to be attached, the maximum width of the area does not exceed (S1-1.0015S2)+10 mm. As in the above embodiment, the maximum width of the incision does not exceed 22.5 mm. Preferably, L1 is less than or equal to (S1-1.0015S2)+5 mm. More preferably, L1 is less than or equal to (S1-1.0015S2)+2 mm.

[0077] like Figure 7 for Figure 6 The schematic diagram of the film area 6 in the figure is attached to the curved product 7 after the cut-out portion 2 is set, and no wrinkles are generated on the edge.

[0078] like Fig. 9 for Figure 8 The schematic diagram of the film area 6 in the figure is attached to the curved product 7 after the cut-out portion 2 is set, and no wrinkles are generated on the edge.

[0079] like Fig.14 for Fig.13 The schematic diagram of the film area 6 in the figure is attached to the curved product 7 after the cut-out portion 2 is set, and no wrinkles are generated on the edge.

[0080] like Fig.16 for Fig.15 The schematic diagram of the film area 6 in the figure is attached to the curved product 7 after the cut-out portion 2 is set, and no wrinkles are generated on the edge.

[0081] In the embodiment of the present application, when the ratio of the difference between the two lengths of the membrane area 6 and S2 is greater than the preset value 0.0015, the redundant part is cut off at the edge by setting the cut-out part 2, which can reduce the wrinkles generated at the edge on the one hand, and on the other hand, the wrinkles can be concentrated at one end of the cut-out part 2 extending to the middle of the flexible substrate 1, and the area affecting the line of sight is only at the cut-out part 2, and the wrinkles in the remaining part are reduced without affecting the size of the visible area at the edge. The technical problem of the wrinkles distributed at the edge affecting the range of the visible area in the prior art is solved, and the advantages of large visible range and long service life are obtained.

[0082] In some preferred embodiments, when there are more than one membrane area 6, such as Fig.11 and Fig.12 As shown, the flexible substrate 1 includes some film regions 6 where ΔS1 / S2 is less than or equal to 0.0015, and other film regions 6 where ΔS1 / S2 is greater than 0.0015. A cut-off portion 2 that runs through the film region 6 in the thickness direction may be provided on the film region 6, such as Fig.13 and Fig.15 As shown, one end of the cutout portion 2 extends to one edge of the membrane area 6, and the other end extends to the middle of the membrane area 6. The opening length of the cutout portion 2 extending along the edge of the membrane area 6 at the edge of the membrane area 6 is L1, and L1 is greater than or equal to (S1-1.0015S2). In this way, the flexible substrate 1 can be divided into several membrane areas 6 according to the shape of the product, including at least one membrane area 6 with △S1 / S2 less than or equal to 0.0015, so that the membrane area 6 produces visually acceptable wrinkles, or even no wrinkles. The redundant part of the membrane is concentrated in the membrane area 6 where △S1 / S2 is greater than 0.0015, and the redundant part of this part is cut off by the cutout portion 2, releasing the wrinkled part and reducing the generation of wrinkles. The visible area of ​​the entire flexible substrate is further increased.

[0083] In some preferred embodiments, the flexible substrate 1 is divided into a number of film regions 6 with ΔS1 / S2 less than or equal to 0.0015, and the film regions 6 can be electrically connected by splicing adjacent regions without using other methods to release stress.

[0084] Specifically, the flexible substrate 1 can be a flexible film, specifically various functional films that can realize various functions, such as a dimming film, a heat insulation film, a thermal regulating film, etc. When in use, the flexible substrate 1 is used to be attached to the curved product 7, so that the curved product 7 can realize the corresponding function. The curved product 7 can be curved glass, etc.

[0085] It is defined here that the actual perimeter of the membrane area 6 after being flattened is S1, and the perimeter of the curved surface when bent into a curved surface is S2.

[0086] like Figure 2 , the flexible substrate 1 provided in this embodiment has an implementation mode of a membrane area 6, Figure 3 for Figure 2 Schematic diagram of the middle film area 6 attached to the curved product 7. Figure 3 The perimeter of the area to which the film area 6 is attached (the attached area is a curved surface), that is, the perimeter of the curved surface when it is bent into a curved surface, is S2. Figure 2 The state of the membrane area 6 when unfolded into a plane (not attached) is shown, and the circumference in this state is the actual circumference S1.

[0087] Alternatively, when the flexible substrate 1 has a plurality of film regions 6, the actual perimeter and the curved surface perimeter of each film region 6 are the same as above.

[0088] Therefore, the circumference of the curved surface when the membrane area 6 is bent into a curved surface can be understood as follows: when the membrane area 6 is attached to the curved surface product 7, the membrane area 6 is bent into a curved surface, which is equivalent to being unfolded in the form of a curved surface. The membrane area 6 has an attachment area when attached to the curved surface product 7, and the contour circumference of this attachment area is the circumference of the curved surface when the membrane area 6 is bent into a curved surface.

[0089] The reason why wrinkles are generated at the edge is that when the film area 6 is attached to the curved surface, the actual perimeter of the film area 6 after being flattened is greater than the contour perimeter of the attached area on the curved surface. Therefore, the contour length of the actual attached area of ​​the film area 6 is smaller than the original perimeter when flattened. When attached, the actual edge will be squeezed, and the excess part will generate wrinkles, specifically, deep wrinkles will be generated at the edge of the film area 6. Therefore, when S1 is greater than S2 and greater than a certain value, wrinkles will be generated at the edge.

[0090] like Figure 1 This is the case where S1 is greater than S2 and greater than a certain value, and wrinkles are generated at the edge.

[0091] In order to prevent wrinkles on the edge of the film area 6 when it is attached to form a curved surface, the flexible substrate 1 in this embodiment has at least one film area 6. S1 minus S2 to obtain △S1, and △S1 / S2 is less than or equal to 0.0015. The edge wrinkles of the film area 6 when attached are the maximum acceptable to the user, and of course all film areas 6 can meet this condition.

[0092] like Figure 2 As shown in the figure, the flexible substrate 1 has only one film area 6, and the film area 6 meets the above conditions, so Figure 3 When the film area 6 is attached to the curved product 7, the wrinkles on the edge are small and almost negligible, which is accepted by users and even no wrinkles are generated on the edge.

[0093] like Figure 4As shown, in some embodiments of the present application, the flexible substrate 1 has two film regions 6, each of which can meet the above conditions. Figure 5 , when attached, no wrinkles will be generated at the edges of the two film regions 6. It should be noted that, in this embodiment, each film region 6 can be independently provided, or can be partially connected together through a connecting portion.

[0094] Specifically, a difference is obtained by subtracting S2 from S1. Since the existence of this difference causes wrinkles on the edge of the flexible substrate 1, the value obtained by dividing the difference by the value of the curved surface perimeter S2 must be less than or equal to 0.0015. The unit of this difference is set to millimeter, and the unit of the curved surface perimeter S2 is set to meter, then △S1 / S2 is less than or equal to 1.5mm / m, that is, the length difference generated per meter must be less than or equal to 1.5mm. In this way, the edge of the membrane area 6 will not produce wrinkles or the wrinkles generated can be accepted by the user. When the difference and the curved surface perimeter are converted to the same unit length, △S1 / S2 is less than or equal to 0.0015.

[0095] In some embodiments of the present application, Fig.11 and Fig.12 When ΔS1 / S2 of at least one film area 6 of the flexible substrate 1 is greater than 0.0015, that is, greater than 1.5 mm / m, a cutout portion 2 may be provided on the film area 6 that does not meet the condition.

[0096] Or, if Figure 6 and Figure 8 , the flexible substrate 1 provided in the figure has a membrane area 6, and does not satisfy △S1 / S2 is less than or equal to 1.5mm / m, which means that the circumference difference per meter is large, which will cause wrinkles at the edge of the membrane. Therefore, in view of this situation, in some embodiments of the present application, such as Figure 6 , Figure 8 as well as Fig.13 and Fig.15 , a cut-out portion 2 penetrating the thickness direction of the membrane area 6 is provided on the membrane area 6 where △S1 / S2 is greater than 1.5mm / m, one end of the cut-out portion 2 extends to one of the edges of the membrane area 6, and the other end extends to the middle of the membrane area 6. The opening length of the cut-out portion 2 at the edge of the membrane area 6 along the extension direction of the edge of the membrane area 6 is L1, and the size of L1 needs to satisfy (S1-L1-S2) / S2 is less than or equal to 0.0015, that is, L1 is greater than or equal to (S1-1.0015S2), where the actual circumference S1 is the actual circumference of the membrane area 6 before the cut-out portion 2 is provided, and the curved surface circumference S2 is the curved surface circumference of the membrane area 6 before the cut-out portion 2 is provided. It should be noted that the actual circumference and the curved surface circumference are the two circumferences of the membrane area 6 before the cut-out portion 2 is provided, that is, the actual circumference of the membrane area 6 when it is unfolded into a plane and the curved surface circumference when it is bent into a curved surface before the cut-out portion 2 is provided. As Figure 6 , Figure 8 as well as Fig.13 and Fig.15 The opening length L1 formed by the cutout portion 2 at the edge of the membrane region 6 is the opening length of the membrane region 6 when it is in a plane unfolded state. When attached, this opening will be narrowed. Figure 7 , Fig. 9 as well as Fig.14 and Fig.16 , or even just completely overlapped. In the embodiment of the present application, the cut-out portion 2 is provided, and when bent, the cut-out portion 2 releases stress, and the cut-out shrinks when bent. The provision of the cut-out portion 2 is equivalent to reducing the length of the actual perimeter, so that it will not be too long to form extrusion and wrinkles.

[0097] Based on any of the above embodiments, improvements are made, such as Figure 6 and Figure 8 Or Fig.13 and Fig.15 , this embodiment provides two forms of opening the cutout portion 2 on the membrane area 6 when the perimeter of the membrane area 6 does not meet the above conditions. The cutout portion 2 is a planar structure and extends along the surface where the membrane area 6 is located. Specifically, the cutout portion 2 is a missing portion opened on the membrane area 6, and the missing portion forms a missing section at the edge of the membrane area 6, that is, an opening is formed at the edge, and the length of the opening is L1. The length of the opening meets the condition that no wrinkles are generated on the edge: (S1-L1-S2) / S2 is less than or equal to 0.0015, that is, the length of the opening L1 must meet the condition that L1 is greater than or equal to (S1-1.0015S2).

[0098] like Fig.10 for Fig. 9 A partial enlarged view of the cut-off part 2 in the middle attachment state, as shown in FIG. Fig.17 for Fig.16 A partial enlarged view of the cut-off part 2 in the attached state. Fig.11 As shown, the flexible substrate 1 provided in the figure includes two film areas 6, one of which satisfies S1 minus S2 to obtain △S1, and △S1 / S2 is less than or equal to 0.0015, that is, it satisfies the condition that no wrinkles are generated at the edge, and the other film area 6 does not meet the condition that no wrinkles are generated when no cutting is performed.

[0099] Therefore, when each film area 6 of the flexible substrate 1 has both a first film area 6 that meets the conditions and a second film area 6 that does not meet the conditions, the cut-off portion 2 is opened on the second film area 6 that does not meet the conditions. And the cut-off portion 2 is located near the first film area 6 that meets the conditions. In the embodiment of the present application, two film areas 6 are preferably set. Since the area where the electrochromic film is set is usually required as a visible area, if the electrochromic film is divided into too many film areas 6, the dividing lines between the film areas 6 will be increased. The dividing lines of each film area 6 usually do not have the function of adjusting light, and too many dividing lines will affect the normal color change of the electrochromic film. Therefore, the electrochromic film is divided into two areas. On the one hand, the dividing lines are reduced to ensure the normal visual range. On the other hand, the division is reduced to ensure that the entire film area 6 can be normally turned on and discolored without affecting the color change effect. On the other hand, the fewer cutting processes are relatively simple, the structure is simple, and it can better fit the curved product 7. In other embodiments, different numbers of partitions can be set according to the shape of the curved product 7 to make the partition of the entire flexible substrate 1 more reasonable.

[0100] It should be noted that the present application provides a cut-out portion 2, which serves as a stress release structure, to eliminate stress release around the membrane area 6, thereby eliminating wrinkles around the cut-out portion 2, or concentrating wrinkles around the cut-out portion 2, specifically, transferring them to the end of the cut-out portion 2 extending toward the middle of the membrane area 6. Since the wrinkles are transferred to the middle, although there are still wrinkles, the impact is much smaller than that of large-scale wrinkles generated at the edge, and other forms can be used to mask the wrinkles, without relying on the black edge of the edge to cover the wrinkles, which reduces the impact on the appearance and increases the visible area. In addition, it also avoids wrinkling at the edge of the device and causing functional failure.

[0101] Therefore, the effect of this embodiment is that, by setting the cut-out portion 2, the circumference of the membrane area 6 whose circumference originally does not meet the conditions is cut off by 2, so as to meet the condition of not generating wrinkles, thereby solving the technical problem of generating large wrinkles at the edge of the membrane area 6 when it is attached to the curved product 7.

[0102] As a preferred embodiment, Figure 4 and Fig.11 , Fig.12 The flexible substrate 1 includes at least two film areas 6, and the adjacent film areas 6 are separated from each other. The separation of adjacent film areas 6 means that each film area 6 is an independent integral film. After the film areas 6 are separated, as long as the perimeter difference of the corresponding film areas 6 satisfies △S1 / S2 is less than or equal to 1.5mm / m, the wrinkles generated in the film area 6 will be acceptable to the user, or even no wrinkles will be generated.

[0103] In some preferred embodiments of the present application, when there are more than one membrane area 6, the adjacent membrane areas 6 are separated. The design of this embodiment divides the corresponding membrane area 6 that meets the conditions according to the specific contour shape of the product to form an independent membrane area 6, thereby reducing the possibility of wrinkles in the membrane area 6. In other words, since a flexible substrate 1 bent into a smaller curvature is separated into multiple membrane areas 6 according to the requirement of not generating wrinkles, the wrinkles generated in each membrane area 6 are reduced, the range of the visible area is increased, and the user experience is improved.

[0104] It is worth noting that the first bus bar and the second bus bar in the flexible electrochromic film are arranged at the edges of the flexible electrochromic film, specifically at the outer edges of each film area 6, that is, no bus bar is arranged at an edge close to each other in each film area 6 in the figure. The color change of the flexible electrochromic film is changed from the surrounding to the middle. Of course, in order to speed up the color change speed, bus bars can also be arranged at the edges close to each other in the film area 6.

[0105] Based on any of the above embodiments, improvements are made. In some preferred embodiments of the present application, for example, Figure 4 , Fig.13 , Fig.15 There is a cutting portion 3 between adjacent film areas 6. Due to the setting of the cutting portion 3, the film areas 6 can be separated.

[0106] Based on any of the above embodiments, in some preferred embodiments of the present application, the cutting portion 3 may be a linear structure, i.e., a cutting line. Since the cutting line is slender, it will not have a significant impact on the visibility or other functions of the flexible substrate 1. The cutting portion 3 runs through the first base layer to the second base layer of the electrochromic film. Generally speaking, the cutting portion 3 extends along the width direction of the electrochromic film, and the specific extension length can be determined according to the size of the electrochromic film.

[0107] If the flexible substrate 1 is a whole, when it is attached to the curved product 7, since the actual perimeter and the contour length of the attachment area are fixed, there will be a part of redundant parts after the flexible substrate 1 with a longer perimeter is attached to the attachment area, and these redundant parts will produce wrinkles at the edge. When the redundant part of the film area 6 that produces wrinkles in the flexible substrate 1 is cut, the film area 6 formed may meet the condition that the edge does not produce wrinkles, or the wrinkles produced are also very small, which can be accepted by the user. For example, when the film area 6 is at a position with a smaller curvature of the curved surface, it can meet the condition that the edge does not produce wrinkles. After cutting here, the size of the connection between the film area 6 and other areas is reduced, and the influence of the stress of the film area 6 in other areas on the film area 6 is also reduced, so that the attachment effect of the film area 6 is not affected by the pulling of other film areas 6, so that the film area 6 is better attached without wrinkles.

[0108] Based on any of the above embodiments, improvements are made, such as Fig.13 and Fig.15 When the flexible substrate 1 in this embodiment has at least two membrane regions 6, the adjacent membrane regions 6 are not completely separated. Incomplete separation means that there are partially connected regions. Fig.13 and Fig.15 Adjacent membrane areas 6 are divided by cutting portions 3 and have uncut connecting segments 8, the actual perimeter of the membrane area 6 is the sum of the lengths of the edge of the membrane area 6 and the connecting segments 8, and the curved surface perimeter of the membrane area 6 is the curved surface perimeter when the area enclosed by the actual perimeter is bent into a curved surface.

[0109] like Fig.13 and Fig.15 , providing a form of incomplete separation. Figure 4 , Fig.11 and Fig.12 In completely separated form.

[0110] Specifically, since a bus bar needs to be provided, adjacent membrane areas 6 may not be completely cut, specifically, there is an uncut part, namely, a connecting section 8, but it can still be divided into different membrane areas 6, because even if it is not completely cut, the stress between the membrane areas 6 is released, and the generation of wrinkles is reduced, or even no wrinkles are generated. When it is not completely cut, the actual perimeter of the membrane area 6 is the sum of the length of the edge of the membrane area 6 and the length of the connecting section 8. The length of the connecting section 8 can be selected to be the minimum length that separates the membrane area 6, and the curved perimeter of the membrane area 6 is the curved perimeter when the area surrounded by the actual perimeter is bent into a curved surface. Since the flexible substrate 1 in the embodiment of the present application is an electrochromic membrane, the electrochromic membrane usually needs to arrange a bus bar at the edge of the membrane, so the adjacent membrane areas 6 are not completely cut, the first bus bar can connect the second conductive layers of the two areas, and the second bus bar can connect the first conductive layers of the two membrane areas 6, and the membrane areas 6 are controlled simultaneously through a power supply and a control. In addition, there is a connecting section 8, and the ITO corresponding to the connecting section 8 is not disconnected, so the two film areas 6 can be connected to each other. After charging or discharging, the electrons in the two film areas 6 will flow to each other, and finally the voltages of the two film areas 6 will reach a balance, making the transmittance of the two areas consistent, avoiding color difference between the two areas, and improving the user experience.

[0111] The effect of this embodiment is that there is a connecting section 8 between the two membrane areas 6, so it is convenient to arrange a bus bar between the two membrane areas 6. The bus bar crosses the connecting section 8 and connects the two membrane areas 6, so that the two membrane areas 6 are connected by one bus bar, and the two membrane areas 6 are controlled together.

[0112] When the film is completely cut off, it is more conducive to relieving wrinkles, but the bus bars need to be arranged separately. This increases the production process and requires two different controllers to control the two separate film areas 6, which increases the control difficulty and production cost. Therefore, in actual production, the length of the cutting line can be selected according to the specific shape of the product and the actual needs.

[0113] Based on any of the above embodiments, improvements are made, such as Figure 4 In this embodiment, the cutting portion 3 may also be a linear structure. The cutting portion 3 may be formed by cutting the electrochromic film using laser cutting to form a cutting portion 3 that runs through the thickness direction of the electrochromic film.

[0114] like Figure 6 , Figure 8 , Fig.13 and Fig.15 As a preferred implementation provided by this embodiment, the cutout portion 2 can be a cutout. The cutout is a planar structure. On the one hand, the cutout can cut off the redundant membrane. On the other hand, the cutout can release stress. When the flexible substrate 1 is bent outward, the stress can be released to reduce the generation of edge wrinkles.

[0115] Furthermore, adhesive can be dripped on both sides of the cut to bond and seal the two sides of the cut, thereby preventing moisture from entering the electrochromic membrane and affecting the color-changing performance of the membrane.

[0116] As a preferred implementation provided by this embodiment, one end of the cutout portion 2 extending toward the middle extends toward the direction of the highest point of the curved arch formed by the membrane area 6. The cutout portion 2 extends toward the middle of the membrane, and the extension direction is toward the highest point of the curved arch, which has a better effect of releasing stress. The highest point of the arch is the point on the curved product 7 that is farthest from the plane when the curved product 7 is placed on the plane due to bending.

[0117] Furthermore, one end of the cutout portion 2 extending toward the middle extends to the highest point of the curved surface arch formed by the membrane area 6. Specifically, generally speaking, the stress at the highest point of the curved surface arch is the greatest, which will cause larger wrinkles in the remaining parts. When the other end of the cutout portion 2 extends to the highest point of the curved surface, the stress of the entire curved surface is released to the maximum extent possible. At this time, the incision has the best anti-wrinkle effect, can release stress to the greatest extent, and reduce the generation of edge wrinkles. When the cutout portion 2 extends to the highest point, it can better release stress.

[0118] In this embodiment, the curvature of the line between the end of the cut-out portion 2 located at the edge of the membrane region 6 and the end extending toward the middle along the curved surface is H1, and the curvature of any line extending from the edge of the membrane region 6 to the middle of the membrane region 6 of the same length is H2, and H1 is greater than H2. Specifically, after the cut-out portion 2 is opened, the cut-out portion 2 is an arc shape with curvature on the curved surface. In this embodiment, when the cut-out portion 2 extends the same length on the curved surface, the cut-out portion 2 preferably selects the opening direction with the largest curvature.

[0119] This embodiment can better release stress and further reduce the generation of wrinkles.

[0120] In the embodiment of the present application, since the cut-out portion 2 is provided in some membrane areas 6, the wrinkles on the surrounding areas can be reduced or even eliminated, or the wrinkles on the surrounding areas can be transferred to one position, specifically to one end where the cut-out portion 2 extends to the middle, so as to avoid wrinkles at the edge of the membrane area 6 and affect the visible area of ​​the entire flexible substrate 1.

[0121] Preferably, the shape of the cutout portion 2 of this embodiment can be designed into different patterns according to different product shapes, and the design of different patterns is mainly reflected in the shape of the pattern. Cutout portions 2 of different shapes will cause the end of the cutout portion 2 extending to the middle to present different fold distributions.

[0122] Preferably, Figure 6 and Fig.13 As shown, in this embodiment, one end of the cut-off portion 2 extending toward the middle of the membrane region 6 is pointed.

[0123] Specifically, the end of the cutout portion 2 extending toward the middle is a pointed structure, and the shape of the entire cutout portion 2 is triangular. In addition, in other embodiments, the shape of the cutout portion 2 is adjusted accordingly according to the shape of the curved product 7, such as changing to a fan-shaped, arched, or special-shaped structure.

[0124] The end of the cut-off portion 2 is a pointed tip, which concentrates the stress of the flexible substrate 1 at the tip, thereby concentrating the stress at the tip and reducing the wrinkles at the edge. Figure 5 and Fig.10 The wrinkle distribution form shown in the figure has the effect of reducing the distribution size of the edge wrinkles, reducing the distribution area of ​​the wrinkles, and effectively increasing the visible area of ​​the flexible substrate 1.

[0125] As another embodiment, Figure 8 , Fig.15 As shown, one end of the cutout portion 2 extending toward the middle of the membrane region 6 is also connected to the through hole 4, which runs through the thickness direction of the membrane region 6. In this embodiment, by providing the through hole 4, the area of ​​the stress concentration area is increased, the stress is dispersed, and the wrinkle problem of the membrane region 6 is further effectively alleviated.

[0126] Specifically, the through hole 4 is in the form of penetrating the upper and lower surfaces of the membrane area 6 and communicating with the cut-out portion 2. Due to the through hole 4, a planar structure is formed at the end of the cut-out portion 2, which is different from the above-mentioned pointed structure and can form smaller wrinkles. The cut-out portion 2 with a planar structure releases stress to a greater extent, thereby reducing the opening length of the cut-out portion 2, thereby increasing the visible area of ​​the edge of the membrane area 6 and dispersing the wrinkles in the through hole 4 structure, further reducing the depth of the wrinkles.

[0127] Furthermore, the inner wall of the through hole 4 has at least a curved surface segment, and the projection of the curved surface segment on the flat surface when the membrane area 6 is flattened is an arc. Figure 8 and Fig.15 As shown, the through hole 4 can be surrounded by an arc segment and a plane segment. Specifically, it can be understood that the shape of the through hole 4 is an arc. The arc is formed by a chord that does not pass through the radius and the corresponding arc; the cutout 2 is connected to the chord, specifically to the middle of the chord. Since the through hole 4 is an arc, the length of the corresponding arc segment increases and has a curvature, so that the stress can be released on the arc segment, and the wrinkles are dispersed in the arc structure, so that the depth of the wrinkles can be reduced, and the visible area can be further increased.

[0128] As a preferred implementation of this embodiment, any one of the film regions 6 is located at the edge of the flexible substrate 1. Specifically, the film region 6 satisfying ΔS1 / S2 less than or equal to 0.0015 is located at the edge of the flexible substrate 1, and the edge of any one of the film regions 6 satisfying ΔS1 / S2 less than or equal to 0.0015 has an overlapped portion with the edge of the entire flexible substrate 1.

[0129] Specifically, after the membrane area 6 is divided, a portion of the edge of the membrane area 6 overlaps with the overall edge of the flexible substrate 1 , that is, is located at the edge of the flexible substrate 1 , so as to facilitate the setting of the busbar on the membrane area 6 .

[0130] like Fig.13 and Fig.15 When the cutting portion 3 does not completely cut out the membrane area 6, that is, when there is a connecting section 8, the length of the cutting portion 3 is L2, and the sum of the length of the cutting portion 3 and the length of the connecting section 8 is L3, and L2 / L3 is greater than 4 / 5. The length of the connecting section 8 can be the length of the extension section when the cutting portion 3 is extended along a straight line until it is completely cut, see Fig.13 and Fig.15 The dotted line part.

[0131] Specifically, the cutting portion 3 is a cut portion, and the connecting section 8 is an uncut connecting portion. When the cutting portion 3 is not completely cut, the cut portion accounts for more than 4 / 5 of the entire length, which can release stress, prevent edge wrinkles, and facilitate the arrangement of busbars.

[0132] Figure 4 and Fig.12 Completely cut open.

[0133] The present application also provides a specific embodiment of a color-changing device, which is attached with the flexible substrate 1 provided in any of the above embodiments.

[0134] The effect of this embodiment is that, since the color-changing device includes the flexible substrate 1, it can achieve the corresponding functional effect, and the flexible substrate 1 will not produce edge wrinkles when attached, will not reduce the function of the color-changing device, and will not affect the appearance.

[0135] Furthermore, the color changing device has at least one curved surface portion, and the flexible substrate 1 is attached to the curved surface portion and is stacked with the curved surface portion.

[0136] The flexible substrate 1 provided in this embodiment can avoid wrinkles at the edge of the curved surface, and does not affect the appearance and function of the curved surface.

[0137] Preferably, the color-changing device includes a first glass, a first adhesive layer, a second glass, and a second adhesive layer which are sequentially arranged in a stacked form, and the flexible substrate 1 is respectively attached to the first glass and the second glass by means of the first adhesive layer and the second adhesive layer, and the first glass and the second glass are both curved glasses.

[0138] In this embodiment, the color changing device is actually a laminated glass, and the laminated glass is specifically curved glass.

[0139] Glass is a commonly used functional device, especially curved glass, which needs to realize corresponding functions, so it is necessary to attach the flexible substrate 1 without affecting the appearance and function of the curved glass.

[0140] Specifically, the first glass and the second glass are both curved glass with the same curvature, a flexible substrate 1 is sandwiched between the two, and the flexible substrate 1 is specifically bonded to the two side glasses through a first adhesive layer and a second adhesive layer.

[0141] The first adhesive layer and the second adhesive layer may be made of PVB resin adhesive.

[0142] The effect is that the laminated glass has two layers of glass, and the corresponding functions are achieved by using the flexible substrate 1, and the influence of wrinkles on the visible area at the edge is avoided.

[0143] As a preferred embodiment, a shielding coating 5 is further provided on the curved glass. The shielding coating 5 is provided corresponding to the gap between the cut-away portion 2 and the film area 6 , and the shielding coating 5 is made of an opaque material.

[0144] The specific form of the shielding coating 5 can be found in Fig.18 and Fig.19.

[0145] Specifically, the opaque material may be ink.

[0146] The pattern of the shielding coating 5 includes a portion of the shielding cut portion 3, a portion of the shielding cut portion 2, and a fold at the middle extension end of the shielding cut portion 2. The advantage of this design is that except for the fold area, other shielding areas can be designed into a smaller shielding pattern, which improves the design freedom and is more beautiful. The shielding pattern is not limited and can be designed as needed. The shielding pattern uses black ink or other opaque materials.

[0147] The present application also provides a specific embodiment of a terminal product, including the flexible substrate 1 provided in any of the above embodiments, or the color-changing device provided in any of the above embodiments.

[0148] The terminal product is any one or more of a vehicle rearview mirror, a curtain wall, a vehicle sunroof, a vehicle side window, a vehicle windshield, a housing of an electronic product, glasses, a means of transportation, and a display panel.

[0149] When the terminal product is provided with the flexible substrate 1, it can prevent wrinkles from being generated at the edge and will not affect the use effect of the terminal product.

[0150] The present application also provides a specific embodiment of a method for preparing the above-mentioned color-changing device, comprising the following steps:

[0151] Placing a first glass; setting a first adhesive layer on the surface of the first glass; setting a flexible substrate 1 on the first adhesive layer; setting a second adhesive layer on the flexible substrate 1; covering with a second glass; trimming; vacuuming; and pressing.

[0152] First, place the first glass flat, then apply the first adhesive layer on the curved surface of the first glass, and then place the flexible substrate 1 on the first adhesive layer. When the area of ​​the flexible substrate 1 is smaller than the area of ​​the glass, perform the edge filling operation, that is, use the film to fill the empty area of ​​the flexible substrate 1, and then place the second adhesive layer on the flexible substrate 1, and then cover the second glass on the second adhesive layer. After that, repair the excess adhesive around the semi-finished laminated structure. After completion, put an adhesive ring on the outer frame of the laminated structure, perform a vacuum operation through a vacuum equipment, and finally perform pre-pressing and then high pressure to obtain laminated glass.

[0153] The effect of this embodiment is that a method for preparing laminated glass is provided, which can produce laminated glass without wrinkles on the edge of the film layer, and there is no need to set a black border to cover the wrinkles, thereby ensuring the visible area of ​​the laminated glass.

[0154] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A flexible substrate, characterized in that: The flexible substrate comprises at least one membrane region, the actual perimeter of the membrane region when unfolded into a plane is S1, and the perimeter of the curved surface when bent into a curved surface is S2; Wherein, S1 of at least one of the film regions is subtracted from S2 to obtain △S1, and △S1 / S2 is less than or equal to 0.0015; and / or, △S1 / S2 of at least one of the film regions is greater than 0.0015, and a cut-off portion penetrating the thickness direction of the film region is provided on the film region where △S1 / S2 is greater than 0.0015, and one end of the cut-off portion extends to the edge of the film region, and the other end extends to the middle of the film region, and the opening length of the cut-off portion extending along the edge direction of the film region at the edge of the film region is L1, then L1 is greater than or equal to (S1-1.0015S2); The actual circumference is the circumference of the membrane area when it is unfolded into a plane before the cut-off portion is opened, and the curved surface circumference is the circumference of the membrane area when it is bent into a curved surface before the cut-off portion is opened.

2. The flexible substrate according to claim 1, characterized in that The curved surface perimeter is the contour perimeter of the attachment area formed when the film area is attached to the surface of the curved product.

3. The flexible substrate according to claim 1, characterized in that The flexible substrate comprises at least two film regions, and adjacent film regions are separated from each other.

4. The flexible substrate according to claim 3, characterized in that: There are cutouts between adjacent film regions.

5. The flexible substrate according to claim 4, characterized in that The cutting portion is a linear structure.

6. The flexible substrate according to claim 1, characterized in that The flexible substrate includes at least two film areas, adjacent film areas are divided by a cutting portion and have an uncut connecting segment, the actual perimeter of the film area is the sum of the length of the edge of the film area and the connecting segment, and the curved surface perimeter of the film area is the curved surface perimeter when the area surrounded by the actual perimeter is bent into a curved surface.

7. The flexible substrate according to claim 6, characterized in that The cutting portion is a linear structure.

8. The flexible substrate according to claim 1, characterized in that The cut-off portion is a cutout, which is a planar structure and extends along the surface where the membrane area is located.

9. The flexible substrate according to claim 1, characterized in that: One end of the cut-off portion extending toward the middle portion extends toward the direction of the highest point of the curved surface arch formed by the membrane area.

10. The flexible substrate according to claim 9, characterized in that One end of the cut-off portion extending toward the middle portion extends to the highest point of the curved surface arch formed by the membrane area.

11. The flexible substrate according to claim 1, characterized in that The curvature of the line connecting the two ends of the cut-off portion along the curved surface in the length direction is H1, and the curvature of any line extending from the edge of the membrane area to the middle of the membrane area of ​​the same length is H2, and H1 is greater than H2.

12. The flexible substrate according to claim 1, wherein One end of the cut-off portion extending toward the middle of the membrane region is pointed.

13. The flexible substrate according to claim 1, characterized in that One end of the cut-off portion extending toward the middle of the membrane region is also connected to a through hole, and the through hole runs through the thickness direction of the membrane region.

14. The flexible substrate according to claim 13, characterized in that The inner wall of the through hole has at least a curved surface segment, and the projection of the curved surface segment on the flat surface is an arc when the film area is flattened.

15. The flexible substrate according to claim 1, characterized in that Any one of the film areas is located at an edge portion of the flexible substrate.

16. The flexible substrate according to claim 6, characterized in that The length of the cutting portion is L2, the sum of the length of the cutting portion and the length of the connecting section is L3, and L2 / L3 is greater than 4 / 5.

17. The flexible substrate according to claim 6, characterized in that The L1 is less than or equal to (S1-1.0015S2)+10 mm.

18. A color changing device, characterized in that: A flexible substrate according to any one of claims 1 to 17 is attached.

19. The color changing device according to claim 18, characterized in that: The color changing device has at least one curved surface portion, and the flexible substrate is attached to the curved surface portion and is stacked with the curved surface portion.

20. The color changing device according to claim 19, characterized in that: The color changing device includes a first glass, a first adhesive layer, a second glass, and a second adhesive layer which are sequentially arranged in a stacked form. The flexible substrate is respectively attached to the first glass and the second glass by means of the first adhesive layer and the second adhesive layer. Both the first glass and the second glass are curved glass.

21. The color changing device according to claim 20, characterized in that: The curved glass is also provided with a shielding coating, which is arranged corresponding to the gap between the cut-away portion and the film area, and is made of a light-proof material.

22. A terminal product, characterized in that: The flexible substrate comprises any one of claims 1 to 17, or the color-changing device comprises any one of claims 18 to 21; the terminal product is any one or more of a vehicle rearview mirror, a curtain wall, a vehicle sunroof, a vehicle side window, a vehicle windshield, a housing of an electronic product, glasses, a means of transportation, and a display panel.

Images