A light control film and light control glass

Abstract

The application provides a dimming film and dimming glass with a continuously gradual change effect of visible light transmittance in an open state. By introducing a high square resistance conductive layer, a single-zone dimming film with continuously gradual change of visible light transmittance in a certain direction can be obtained while keeping other production processes unchanged. The dimming film can play a comprehensive dimming role in application scenarios requiring continuously gradual change of transmittance, and meet the functional, aesthetic and other scene use requirements in the fields of vehicles or buildings.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic light control materials, in particular to a light-adjustable film and light-adjustable glass. BACKGROUND

[0002] Light-adjustable film is an electronic light control device, which mainly sets a light control layer between two layers of transparent conductive film. When the electric field is turned on, the arrangement or state of the material in the light control layer changes, thereby changing the light transmission characteristics of the device, such as converting from low light transmission to high light transmission, or from high light transmission to low light transmission. Through the action of electric field, the device can realize the rapid conversion between on state and off state. According to the light control mechanism of the light control layer, the light-adjustable film can be divided into suspended particle light-adjustable film, polymer dispersed liquid crystal light-adjustable film, electrochemical reaction light-adjustable film, etc.

[0003] The light-adjustable film known in the art, such as polymer dispersed liquid crystal light-adjustable film and suspended particle light-adjustable film, will change from opaque to uniformly transparent in the on state, while the electrochemical reaction light-adjustable film will change from transparent to uniformly opaque in the on state. Of course, there are also reverse mode light-adjustable films, such as reverse polymer dispersed liquid crystal light-adjustable film, which will change from transparent to uniformly opaque in the on state. In summary, the existing light-adjustable film has a uniform distribution of visible light transmission in the on state. In addition, there are also technologies that divide the entire light-adjustable film into different zones and apply different power to different zones to achieve different visible light transmission of the entire light-adjustable film in the on state. This will increase the manufacturing cost of the light-adjustable film and cannot achieve a continuous gradual change effect. However, in some cases, if a light-adjustable film with a continuous gradual change distribution of visible light transmission in the on state can be used, for example, for the front windshield of a car, if it can present a continuous gradual change effect of the visible light transmission from low to high, the driver can avoid suffering from light pollution such as glare while driving at high speed, and at the same time ensure a clear view and improve driving safety. In addition, some buildings also require light-adjustable glass to present a gradual change of visible light transmission to meet the aesthetic requirements.

[0004] The present application introduces a high sheet resistance transparent conductive layer and is assisted by the setting of wires, so that the light-adjustable film under constant applied voltage can produce a continuous gradual change effect of light transmission, while the overall technical parameters of the light control layer remain unaffected, so that the production of the gradual change light-adjustable film can be realized on the original light-adjustable film production line. The light-adjustable film can play a comprehensive light-adjusting role in application scenarios that require continuous gradual change of light transmission, and meet the functional, aesthetic and other scene use requirements in the field of transportation tools or buildings. SUMMARY

[0005] The present application provides a light-adjustable film and light-adjustable glass with a gradual change of visible light transmission in at least one direction along the surface of the light-adjustable film.

[0006] In the first aspect, the application provides a light-adjustable film, comprising a first transparent substrate (1-1), a first transparent conductive layer (2-1), a light control layer (3), a second transparent conductive layer (2-2), and a second transparent substrate (1-2) arranged in sequence, wherein the light-adjustable film has a gradually changing region of visible light transmittance in at least one direction on the surface in the open state, the region is a single-zone light-adjustable region, the sheet resistance of the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) is greater than or equal to 300 ohms / square, and Qon represents the degree of gradual change of the visible light transmittance of the region in the open state.

[0007] Qon=(Ton max -Ton min ) / Lon,

[0008] Ton max is the maximum visible light transmittance of the region in the open state in the direction, Ton min is the minimum visible light transmittance in the direction,

[0009] Lon is the distance between Ton max and Ton min , and the unit is meter,

[0010] Qon is a dimensionless value,

[0011] wherein the value of Qon is 3.0≥Qon≥0.05.

[0012] Further, the sheet resistance of the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) is greater than or equal to 600 ohms / square.

[0013] Further, the sheet resistance of the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) is greater than or equal to 800 ohms / square.

[0014] Further, the value of Qon is 2.0≥Qon≥0.08.

[0015] Further, the value of Qon is 1.5≥Qon≥0.1.

[0016] Further, the visible light transmittance of the light-adjustable film in any direction on the surface of the light-adjustable film in the closed state is uniform, and Qoff represents the uniformity of the visible light transmittance in the closed state.

[0017] Qoff=(Toff max -Toff min ) / Toff max ,

[0018] Toff maxTmax is the maximum visible light transmittance of the dimming film along the direction in the on state, min Tmin is the minimum visible light transmittance along the direction,

[0019] Wherein, the value of Qoff is: 0.5≥Qoff≥0.0.

[0020] Further, the value of Qoff is: 0.2≥Qoff≥0.0.

[0021] Further, the thickness of the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) is ≤100nm.

[0022] Further, the thickness of the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) is ≤50nm.

[0023] Further, the light control layer (3) is at least one of a suspended particle light control layer, a polymer dispersed liquid crystal light control layer or an electrochemical reaction light control layer.

[0024] Further, the dimming film contains at least two wires connected to an external power source, wherein the at least two wires are distributed on the same side or adjacent sides of the dimming film and are respectively connected to the first transparent conductive layer (2-1) and the second transparent conductive layer (2-2).

[0025] Further, the visible light transmittance of the dimming film in the on state continuously and gradually decreases from one side of the distribution of the wires to the opposite side.

[0026] Further, the single-zone dimming region constitutes an entire dimming film.

[0027] Further, the single-zone dimming region and other dimming regions constitute an entire dimming film.

[0028] In the dimming film of the present application, the other dimming regions are not specifically limited and can be partitioned dimming regions, regions without dimming function or the single-zone dimming region of the present application.

[0029] Further, the number and combination of the single-zone dimming region and other dimming regions are not specifically limited.

[0030] Further, the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) of the single-zone dimming region is electrically conductive everywhere.

[0031] Further, the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) of the single-zone dimming region has a local region that is not electrically conductive with other regions, wherein the local region does not have dimming function.

[0032] Further, the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) is selected from at least one of ITO conductive layer, FZO conductive layer, IZO conductive layer, GZO conductive layer, AZO conductive layer, PEDOT conductive layer, nano-Ag wire conductive layer, conductive graphene, and nano-Cu wire conductive layer.

[0033] Further, the transparent conductive layer has a local area electrically disconnected from other areas by an electrically disconnected isolation line.

[0034] Further, the electrically disconnected isolation line divides the first transparent conductive layer and / or the second transparent conductive layer into at least two parts, which are electrically disconnected.

[0035] Further, the electrically disconnected isolation line can be at least one of a straight line, an arc line, or an irregular pattern.

[0036] Further, the electrically disconnected isolation line can form a closed curve.

[0037] Further, the electrically disconnected isolation line can form a closed curve.

[0038] Further, the electrically disconnected isolation line can form a closed curve.

[0039] Further, the electrically disconnected isolation line can form a closed curve.

[0040] Further, the electrically disconnected isolation line can form a closed curve.

[0041] Further, the electrically disconnected isolation line can form a closed curve.

[0042] Further, the electrically disconnected isolation line can form a closed curve.

[0043] Further, the electrically disconnected isolation line can form a closed curve.

[0044] Further, the laser inner etching, taking the whole light-adjusting film as a whole, etches a separation line from the first transparent substrate side to the first transparent conductive layer side, and the separation line does not etch to or through the second transparent substrate after etching through the first transparent conductive layer, and the separation line area is referred to as an "electrically non-conductive isolation line" in the present application; or etches a separation line from the second transparent substrate side to the second transparent conductive layer side, and the separation line does not etch to or through the first transparent substrate after etching through the second transparent conductive layer, and the separation line area is referred to as an "electrically non-conductive isolation line" in the present application.

[0045] Further, the laser inner etching, taking the whole light-adjusting film as a whole, etches a separation line from the first transparent substrate side to the first transparent conductive layer side, and the separation line does not etch to or through the second transparent substrate after etching through the first transparent conductive layer, and the separation line area is referred to as an "electrically non-conductive isolation line" in the present application; or etches a separation line from the second transparent substrate side to the second transparent conductive layer side, and the separation line does not etch to or through the first transparent substrate after etching through the second transparent conductive layer, and the separation line area is referred to as an "electrically non-conductive isolation line" in the present application.

[0046] Further, the surface of the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) towards the light control layer (3) is covered with an adhesive layer; the adhesive layer material includes at least one of epoxy resin, polyurethane, polyimide resin, polystyrene resin, acrylic resin, modified acrylic resin or silicone resin.

[0047] In the light-adjusting film of the present application, the material of the first transparent substrate (1-1) and the second transparent substrate (1-2) is not specifically limited.

[0048] Further, the first transparent substrate (1-1) and / or the second transparent substrate (1-2) is selected from at least one of PET, PEN, PP, PI, PE and PC.

[0049] The first transparent conductive layer and the second transparent conductive layer of the single-zone light-adjusting area are electrically conductive at each position; or the transparent conductive layer of the area is electrically non-conductive with other areas of the transparent conductive layer, and the local area does not have light-adjusting function, which means that the local area does not require an open state, i.e. the local area is always in a closed state, and in a specific embodiment, a very small area around the first transparent conductive layer and / or the second transparent conductive layer is electrically non-conductive with the internal area of the conductive layer, and the internal area is electrically conductive at each position.

[0050] In a second aspect of the present application, a light-adjustable glass is provided, comprising a first glass plate (4-1) and a second glass plate (4-2), and the light-adjustable film described above arranged between the first glass plate (4-1) and the second glass plate (4-2).

[0051] In the present application, the types of the first glass plate and the second glass plate are not particularly limited, and can be transparent glasses commonly used in light-adjustable glasses known to those skilled in the art, which can be ordinary glasses such as inorganic glasses, organic glasses, or functional glasses such as UV-blocking glasses, IR-blocking glasses, Low-E glasses, tempered glasses, or antibacterial glasses, and can also be selected from colored glasses such as gray glasses and tea-colored glasses.

[0052] Further, a first interlayer (5-1) is arranged between the first glass plate (4-1) and the light-adjustable film, and / or a second interlayer (5-2) is arranged between the second glass plate (4-2) and the light-adjustable film.

[0053] In the present application, the types of the first interlayer and the second interlayer are not particularly limited, and can be interlayers commonly used in light-adjustable glasses known to those skilled in the art, which can be EVA films, TPU films, PVB films, or functional films such as UV-blocking EVA films, UV-blocking TPU films, and UV-blocking PVB films, or colored films such as gray EVA films, gray TPU films, and gray PVB films.

[0054] In the present application, the manufacturing method of the light-adjustable glass is not particularly limited, and can be a conventional interlayer method for light-adjustable glasses, such as interlayer in a laminator, or interlayer in an autoclave or an interlayer box / furnace.

[0055] The present application can increase the potential difference of the conductive layer in a certain direction by introducing a high-resistance conductive layer, so as to realize continuous and gradual change of the visible light transmittance of the light-adjustable film in a certain direction, while other manufacturing processes of the light-adjustable film remain unchanged. The light-adjustable film product prepared by the process can meet the requirements of continuous and gradual change of the visible light transmittance in multiple application scenarios in the fields of transportation and construction.

[0056] The light-adjustable film / light-adjustable glass of the present application can be combined with other light-adjustable films / light-adjustable glasses to form a composite light-adjustable film / light-adjustable glass, which meets the functionalization and aestheticization requirements in the fields of construction and transportation. BRIEF DESCRIPTION OF DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. The accompanying drawings in the following description are only embodiments of the present application, and other drawings can be obtained by the provided drawings without creative labor for those skilled in the art.

[0058] Figure 1 A cross-sectional structure schematic diagram of the light-adjustable film provided for the embodiments of the present application;

[0059] Figure 2 A cross-sectional structure schematic diagram of the light-adjustable film provided for the embodiments of the present application;

[0060] Figure 3 A cross-sectional structure schematic diagram of the light-adjustable glass provided for the embodiments of the present application and a light transmission schematic diagram;

[0061] Figure 4 A visible light transmittance change diagram of the light-adjustable film provided for the embodiments of the present application;

[0062] Figure 5 A cross-sectional structure schematic diagram of the multi-zone light-adjustable film provided for the embodiments of the present application;

[0063] Wherein, 1-1. first transparent substrate, 1-2. second transparent substrate, 2-1. first transparent conductive layer, 2-2. second transparent conductive layer, 3. light control layer, 4-1. first glass plate, 4-2. second glass plate, 5-1. first interlayer, 5-2. second interlayer, D-1, D-2. electrically conductive wire, A-1. ~ A-4. electrically non-conductive isolation line. DETAILED DESCRIPTION

[0064] TERMS

[0065] In the present application, the following terms used have the meanings as defined below.

[0066] ON state:

[0067] It refers to the state of the light-adjustable film after the recommended power supply is applied from the OFF state and the visible light transmittance is stable.

[0068] OFF state:

[0069] It refers to the state of the light-adjustable film after the recommended power supply is applied from the ON state and the visible light transmittance is stable.

[0070] Transparent conductive film:

[0071] Transparent conductive film:

[0072] At least one direction of the surface of the light-adjustable film:

[0073] The direction of the line segment of the intersection of the plane with the light control film.

[0074] Sheet resistance:

[0075] Sheet resistance, which represents the conductive property of the conductive material of the film. When a voltage is applied to the conductive material of the film, the conductive material of the film will hinder the current flow. This hindering effect is called sheet resistance, which is represented by R in the present application. max Rmax represents the maximum sheet resistance. min Rmin represents the minimum sheet resistance. R=ρ / D, where ρ is the resistivity of the conductive material of the film, and D is the thickness of the conductive material of the film. The sheet resistance is related to the conductive property of the conductive material of the film and the thickness of the conductive material of the film.

[0076] The maximum visible light transmittance Toff of the light control film in the off state along at least one direction on the surface of the light control film max The minimum visible light transmittance Toff of the light control film in the off state min

[0077] The direction of the line segment of the intersection of the plane with the light control film. max The minimum visible light transmittance Toff of the light control film in the off state min

[0078] The maximum visible light transmittance Ton of the light control film in the on state along at least one direction on the surface of the light control film max The minimum visible light transmittance Ton of the light control film in the on state min

[0079] The direction of the line segment of the intersection of the plane with the light control film. max The minimum visible light transmittance Ton of the light control film in the on state min

[0080] The definitions of the on state, off state, Ton and Toff of the light control glass are related to the light control film.

[0081] The transmittance of the light control film / light control glass is measured by LS116 transmittance meter (Shenzhen Linshang Technology Co., Ltd.). When no voltage is applied (off state), the transmittance of the light control film / light control glass is marked as Toff= %. When the recommended power supply of the light control film / light control glass is applied (on state), the transmittance of the light control film / light control glass is marked as Ton= %.

[0082] The sheet resistance of the transparent conductive film is measured by Keithley 2100 four-probe resistance tester.​​​​

[0083] The thickness of the transparent conductive layer on the cross section of the transparent conductive film was measured by a SNE-4500M Plus scanning electron microscope of SEC.

[0084] The present application provides a dimming film with continuously gradual change of visible light transmittance in the on state, which realizes effective potential difference by using high sheet resistance conductive layer and auxiliary conductive wire setting, so that the conductive film generates gradually changing voltage drop in a certain direction, thereby obtaining the overall dimming effect and aesthetic function of the dimming film with continuously gradual decrease / increase of light transmittance.

[0085] In order to better illustrate the present application, the following specific examples are provided.

[0086] Example 1 Preparation of ITO / PET transparent conductive film

[0087] An ITO / PET transparent conductive film was prepared by a direct current magnetron sputtering deposition method in a vacuum environment on the surface of a PET film substrate through a roll-to-roll process. The sputtering process was carried out at a voltage of 200 V and a magnetic field strength of 1400 G, using Ar-O2 mixed gas as the process gas, with a volume ratio of argon to oxygen of 3:1. The temperature of the PET film substrate during deposition was 98℃, the sputtering gas pressure was 0.4 Pa (absolute pressure), the thickness of the ITO coating was 50 nm, the sheet resistance was 300 ohms / square, and the width of the transparent conductive film was 1.5 meters. The parameters are shown in Table 1.

[0088] Example 2 Preparation of ITO / PET transparent conductive film

[0089] The same as Example 1, except that the temperature of the PET film substrate was 120℃, and the thickness of the ITO was 40 nm, the sheet resistance was 424 ohms / square, and the parameters are shown in Table 1.

[0090] Example 3 Preparation of ITO / PET transparent conductive film

[0091] The same as Example 1, except that the sputtering gas pressure was 0.2 Pa (absolute pressure), and the thickness of the ITO was 30 nm, the sheet resistance was 657 ohms / square, and the parameters are shown in Table 1.

[0092] Example 4 Preparation of ITO / PET transparent conductive film

[0093] The same as Example 1, except that the temperature of the PET film substrate was 70℃, the sputtering gas pressure was 0.5 Pa (absolute pressure), and the thickness of the ITO was 20 nm, the sheet resistance was 782 ohms / square, and the parameters are shown in Table 1.

[0094] Example 5 Preparation of light modulating film

[0095] Preparation of light control particles:

[0096] Into a 250 mL three-necked round bottom flask, 30 g of 21.2 wt% nitrocellulose (type SS 1 / 4 sec) in isoamyl acetate, 6 g of I2, 70 g of isoamyl acetate, 4 g of anhydrous CaI2, and 4 g of titanium dioxide (type P25) were added and heated to 42°C. After the I2 was dissolved, 6 g of anhydrous methanol, 0.8 g of distilled water, and 4 g of 2,5-pyrazinedicarboxylic acid dihydrate were added to the three-necked round bottom flask and the reaction was stirred at 42°C for 4 hours and then allowed to cool naturally. The resulting reaction solution was centrifuged at 1350 G for 0.5 h to remove the large particulate product, and the supernatant was then centrifuged at 18000 G for 5 h, and the supernatant was discarded to obtain the light control particles.

[0097] Preparation of the polymer matrix precursor:

[0098] A 2.7 g of trisilanol-ethyl-POSS was dissolved in 190 mL of heptane to form a POSS solution. Into a 500 mL three-necked round bottom flask, 54 g of hydroxyl-terminated dimethyldiphenyl polysiloxane and 190 mL of the above POSS solution were added. The three-necked round bottom flask was connected to a water separator with a condenser tube on one side, a mechanical stirrer in the middle, and a thermometer on the other side; the solution in the three-necked round bottom flask was heated to reflux for 30 min, and when a small amount of water appeared in the water separator, a catalyst stannous octoate solution (0.13 g of stannous octoate dissolved in 10 mL of heptane to form a solution) was added. Then, 3 g of a mixture of hydrolyzed acryloxypropyltrimethoxysilane and 1.8 g of hydrolyzed epoxpropyltrimethoxysilane were added dropwise for about 5 min. The condensation reaction was then continued for 5 h, after which 30 mL of trimethylmethoxysilane was immediately added as a reaction terminator; the termination reaction continued for 2 h, and then the reaction was quickly cooled to room temperature. 50 mL of ethanol and the cooled reaction solution were mixed and stirred in a 1 L beaker, and 30 mL of heptane was used to wash the reaction flask and poured into the beaker. After mixing well, 200 mL of methanol was added and stirred for 15 min. The resulting mixture was poured into a 1 L separatory funnel, and after standing for several hours, the layers were separated. The lower layer was removed and rotary evaporated at 70°C to obtain the polymer matrix precursor.

[0099] Preparation of the light control layer matrix emulsion:

[0100] 0.1 g of a photoinitiator 819, 3.0 g of the light control particles, 26.9 g of a suspending medium, i.e., dioctyl terephthalate, and 70.0 g of the polymer matrix precursor were mixed well to obtain the light control layer matrix emulsion.

[0101] The suspension particle light control layer matrix emulsion was coated on the ITO / PET transparent conductive film prepared in Example 1 by a roll-to-roll automatic film coating machine, and then another layer of ITO / PET transparent conductive film prepared in Example 1 was overlaid on the wet film of the light control layer matrix emulsion, to obtain a wet film containing a light control layer. Under a nitrogen atmosphere, the wet film was cured in a UV curing box for 1 minute, with a UV power of 700 W / m 2 , to obtain a section of the light control film 1 as shown in Figure 1 , and the light control film parameters are shown in Table 2. In the open state, it presents a continuously gradually changing visible light transmittance, as shown in Figure 4 .

[0102] Example 6 Preparation of light modulating film

[0103] The same as Example 5, except that the transparent conductive film prepared in Example 2 was used instead, and the section of the light control film was as shown in Figure 1 , to obtain a light control film 2, and the light control film parameters are shown in Table 2.

[0104] Example 7 Preparation of light modulating film

[0105] The same as Example 5, except that the transparent conductive film prepared in Example 3 was used instead, and the section of the light control film was as shown in Figure 1 , to obtain a light control film 3, and the light control film parameters are shown in Table 2.

[0106] Example 8 Preparation of light modulating film

[0107] The same as Example 5, except that the transparent conductive film prepared in Example 4 was used instead, and the section of the light control film was as shown in Figure 1 , to obtain a light control film 4, and the light control film parameters are shown in Table 2.

[0108] Example 9 Preparation of light modulating glass

[0109] The ordinary tempered glass was used as the first and second glass plates, EVA adhesive film was set as the first and second adhesive layers, and the light control film prepared in Example 1 was used, and the light control film was stacked, and the section view is shown in Figure 3 , to obtain a light control glass 5, and the light control glass parameters are shown in Table 2.

[0110] Example 10 Preparation of multi-zone light modulating film

[0111] The same as Example 5, except that a multi-zone light control film was prepared, as shown in Figure 5 , and laser internal etching means was used, and A-1. ~ A-4. in the figure were set as electrically non-conductive isolation lines, which were set on the first transparent conductive layer (2-1) and the second transparent conductive layer (2-2). Through circuit control, the light control areas on both sides of the isolation lines were in different on-off states. That is, a light control film 6 was obtained.

[0112] Of course, the electrically non-conductive isolation lines can be set according to actual needs, and can be set on the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2). The specific number and position can be adjusted according to actual needs. Specifically, as shown in Figure 5 only A-2 is set, and the light control film is divided into two regions, i.e., the A-2 left region and the A-2 right region, which is a partitioned light control film. The A-2 left region and the A-2 right region can be controlled by a circuit to achieve the open state of the A-2 left region and the closed state of the A-2 right region, or other combinations.

[0113] As can be seen from Table 2, the change range of the visible light transmittance of the light control film / light control glass of the embodiments and the Q value in the open and closed states.

[0114] Figure 4 The light control film of Example 5 exhibits a continuously and gradually changing visible light transmittance in the open state, with a change range of 23.5-62.4%.

[0115] The light control range of the light control film / light control glass in the open state can meet the requirements of continuously and gradually changing visible light transmittance in multiple scenes.

[0116] Table 1: Parameters of the transparent conductive films prepared in Examples 1-4

[0117]

[0118] Table 2: Parameters of the light control films / light control glasses prepared in Examples 5-9

[0119]

[0120] The above descriptions of the embodiments are only used to help understand the method of the present application and its core idea. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dimming film, characterized in that: The invention comprises a first transparent substrate (1-1), a first transparent conductive layer (2-1), a light control layer (3), a second transparent conductive layer (2-2), and a second transparent substrate (1-2) which are stacked in sequence, wherein the dimming film comprises at least two wires connected to an external power supply, wherein at least two wires are distributed on the same side or adjacent sides of the dimming film and are respectively connected to the first transparent conductive layer (2-1) and the second transparent conductive layer (2-2); and the visible light transmittance of the dimming film in an on state gradually decreases from one side where the wires are distributed to the opposite side. The dimming film has a region where the visible light transmittance gradually changes along at least one direction of the surface in the on state, the region being a single-zone dimming region, and the sheet resistance of the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) being ≥300 ohms / □; Qon is used to represent the degree of gradual change in the visible light transmittance of the region in the on state. Blood= (Tone max -Tone min ) / Lon, Ton max is the maximum visible light transmittance of the region along the direction in the open state, Ton min is the minimum visible light transmittance in the direction, Lon to Ton max With Ton min The distance between two points in meters, Among them, the Qon value is: 3.0 ≥ Qon ≥ 0.

05.

2. The dimming film according to claim 1, wherein: The sheet resistance of the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) is ≥ 600 ohms / □.

3. The dimming film according to claim 1, wherein: The sheet resistance of the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) is ≥ 800 ohms / □.

4. The dimming film according to claim 1, wherein: The Qon value is: 2.0 ≥ Qon ≥ 0.

08.

5. The dimming film according to claim 1, wherein: The Qon value is: 1.5 ≥ Qon ≥ 0.

1.

6. The dimming film according to claim 1, wherein: The visible light transmittance of the dimming film in the off state is evenly distributed along any direction on the surface of the dimming film. Qoff is used to represent the uniformity of the visible light transmittance distribution in the off state. Qoff= (Toff max -Toff min ) / Toff max , Toff max Toff is the maximum visible light transmittance of the switchable film along the direction in the off state, min is the minimum visible light transmittance in the direction, Among them, the Qoff value is: 0.5 ≥ Qoff ≥ 0.

0.

7. The dimming film according to claim 6, wherein: The Qoff value is: 0.2 ≥ Qoff ≥ 0.

0.

8. The dimming film according to claim 1, wherein: The thickness of the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) is ≤ 100 nm.

9. The dimming film according to claim 1, wherein: The light control layer (3) is at least one of a suspended particle light control layer, a polymer dispersed liquid crystal light control layer or an electrochemical reaction light control layer.

10. The light-switching film according to claim 1, wherein: The single-zone dimming area constitutes a whole dimming film.

11. The light-switching film according to claim 1, wherein: The single-zone dimming area and other dimming areas constitute a whole dimming film.

12. The light-switching film according to claim 1, wherein: Every part of the first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) in the single-zone dimming area is electrically conductive.

13. The light-switching film according to claim 1, wherein: The first transparent conductive layer (2-1) and / or the second transparent conductive layer (2-2) of the single-zone dimming area has a local area that is electrically non-conductive with other areas, wherein the local area does not have a dimming function.

14. A dimming glass, characterized in that: The invention comprises a first glass plate (4-1) and a second glass plate (4-2), and a dimming film according to any one of claims 1 to 13 arranged between the first glass plate (4-1) and the second glass plate (4-2).

15. The switchable glass according to claim 14, characterized in that: A first interlayer (5-1) is provided between the first glass plate (4-1) and the dimming film, and / or a second interlayer (5-2) is provided between the second glass plate (4-2) and the dimming film.

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