CN211808269U

CN211808269U - Photochromic gradual change diaphragm and carry on its apron

Info

Publication number: CN211808269U
Application number: CN201922416835.6U
Authority: CN
Inventors: 陈娟; 陈征; 王忠英
Original assignee: Shine Optoelectronics Kunshan Co Ltd
Current assignee: Shine Optoelectronics Kunshan Co Ltd
Priority date: 2019-12-29
Filing date: 2019-12-29
Publication date: 2020-10-30
Anticipated expiration: 2029-12-29

Abstract

The application provides a photochromism gradual change diaphragm and carry its apron, photochromism gradual change in this photochromism gradual change diaphragm can be the one deck structure, it has the function of photochromism and colour gradual change, or has two-layer structure, its one deck is ordinary gradual change chromatograph or photochromism layer, the opposite side is the photochromism layer, photochromism gradual change diaphragm discolours and presents the colour gradual change under receiving shining of light like this, this photochromism gradual change diaphragm simple structure need not plus scarce the energy, utilize the light energy can realize discolouring promptly, overcome the unchangeable not enough of traditional gradual change membrane.

Description

Photochromic gradual change diaphragm and carry on its apron

Technical Field

The utility model relates to an optical film technical field specifically relates to a photochromism gradual change diaphragm and carry on its apron.

Background

With the improvement of living standard, people have higher requirements on appearance decoration of various consumer products, for example, the appearance of mobile phones has become one of the main determinants of whether products are sold well. In recent years, the introduction of the gradient color brings new changes to the decoration of the mobile phone rear cover, so that the mobile phone rear cover becomes more aesthetic and attractive.

The color of the decorative film used in the market is fixed. To meet the increasing demands of consumers on the appearance of products, new design elements need to be introduced.

Therefore, there is a need in the art for a new photochromic gradient film.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the new photochromic gradual-change film is provided, the film changes color under the action of light, and the film has changeable visual effect of color gradual change, so that the defect that the color of the existing decorative film (gradual-change film) is unchanged is overcome, and a better photochromic gradual-change color effect is achieved.

In order to achieve the purpose, the technical scheme adopted by the application is as follows,

a photochromic gradual-change film is characterized by comprising a base material and a photochromic layer stacked on one side of the base material,

the photochromic layer contains photochromic material which can develop color when being illuminated, and the thickness of the photochromic material gradually increases or gradually decreases from one side to the other side, or

The photochromic layer's thickness is even, and it disposes a plurality of recess, and is plural the recess intussuseption is filled with the photochromic material that can develop colour when receiving illumination, and is plural in at least one kind parameter change setting in width, degree of depth, the duty cycle of recess.

Preferably, the photochromic gradient film further comprises another photochromic layer stacked on the same side or the other side of the substrate.

Preferably, the photochromic gradient film further comprises a gradient color layer stacked on the same side or the other side of the substrate.

The embodiment of the application provides a photochromic gradual change diaphragm, which is characterized by comprising:

a substrate;

a photochromic layer laminated on one side of the base material, the photochromic layer containing a photochromic material which develops color when exposed to light;

and the gradient color layer is laminated on the same side or the opposite side of the substrate and the photochromic layer.

Preferably, the photochromic layer has a uniform thickness or a gradual thickness increasing or decreasing from one side to the other.

Preferably, the photochromic layer has a uniform thickness and comprises a first photochromic layer, a second photochromic layer or a gradient color layer laminated on the first photochromic layer, wherein the thickness of the first photochromic layer is gradually increased from one side to the other side,

the second photochromic layer or the gradient color layer is gradually reduced in thickness from one side to the other side.

Preferably, the photochromic layer has a uniform thickness, and includes a plurality of grooves having a width, a depth, or a duty ratio that varies, and the grooves are filled with a photochromic material.

Preferably, the substrate is selected from the group consisting of glass, quartz, transparent plastic substrates, ceramic substrates,

One or the combination of PET film, transparent PI film, PEN film, nano cellulose paper and explosion-proof film.

Preferably, the photochromic gradual-change membrane further comprises a micro-nano structure, wherein the micro-nano structure is arranged on one side of the base material, the micro-nano structure comprises a plurality of micro lenses, or a reflecting layer and/or a coloring layer are/is further laminated on the micro-nano structure.

The embodiment of the application provides a cover plate, which carries the photochromic gradual-change film.

Advantageous effects

Compared with the scheme in the prior art, the photochromic gradual-change film provided by the embodiment of the application has the functions of the gradual-change film, and the color of the film changes under the condition of light irradiation (such as sunlight) and is gradually changed under the color-change state. Meanwhile, the manufacturing process of the photochromic gradient film is low in difficulty, the photochromic effect can be achieved by utilizing a single-layer gradient structure during manufacturing, or on the basis, the photochromic gradient film is further optimized through a laminated gradient color layer, so that the better photochromic effect is achieved.

Drawings

In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the specification, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise:

fig. 1 is a schematic structural diagram of a photochromic gradient film according to a first embodiment of the present application;

FIG. 2 is a schematic structural diagram of a photochromic gradient film according to a second embodiment of the present application;

FIG. 3 is a schematic structural diagram of a photochromic gradient film according to a third embodiment of the present application;

FIG. 4 is a schematic structural diagram of a photochromic gradient film according to a fourth embodiment of the present application;

FIG. 5 is a schematic structural diagram of a fifth embodiment of a photochromic gradient film;

FIG. 6 is a schematic structural diagram of a photochromic gradient film according to a sixth embodiment of the present application;

FIG. 7 is a schematic structural diagram of a photochromic gradient film according to a seventh embodiment of the present application;

FIG. 8 is a schematic structural diagram of a photochromic gradient film according to an eighth embodiment of the present application;

fig. 9 is a schematic structural view of a photochromic gradient film according to a ninth embodiment of the present application;

fig. 10 is a schematic structural view of a photochromic gradient film according to a tenth embodiment of the present application;

fig. 11 is a schematic structural diagram of a photochromic gradient film according to an eleventh embodiment of the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solution proposed by the present invention, the technical solution in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only a part of the embodiments in the present specification, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from one or more of the embodiments described herein without making any inventive step, shall fall within the scope of protection of the present invention.

The application provides a photochromic gradual change diaphragm, this photochromic gradual change can be its function that has photochromic and colour gradual change of one deck structure, or has two-layer structure, and its one deck is ordinary gradient colour layer or photochromic layer, and another layer is photochromic layer. Therefore, the color of the film changes under the light (such as sunlight, ultraviolet light and the like), the color can be changed visually, the effect of color gradual change is achieved, and the defect that the color of the traditional gradual change color film is unchanged is overcome. The photochromic phenomenon is that the color changes under the irradiation of light sources such as sunlight or ultraviolet light, and the photochromic phenomenon can be restored to the original color reversibly after the light disappears.

The photochromic gradient film proposed in the present application is described in detail below with reference to the accompanying drawings.

As shown in fig. 1, which is a schematic structural diagram of a photochromic gradient film according to an embodiment of the present application, the photochromic gradient film 10 includes a substrate 11 and a photochromic layer 12, wherein the photochromic layer 12 is disposed on the substrate 11. In the present embodiment, the substrate 11 is a transparent substrate selected from glass, quartz, transparent plastic substrates, ceramics, etc., or selected from PET films, transparent PI films, PEN films, nanocellulose papers, explosion-proof films, etc. The photochromic layer comprises a photochromic material that exhibits a color gradient characteristic in one color change state. The photochromic layer has a thickness gradually increasing from one side to the other side, so that its color shows a gradual change characteristic under the irradiation of light due to the influence of the thickness. Preferably, the photochromic material-containing ink is prepared by processes of nano printing, ink-jet printing, silk screen printing, offset printing and the like or by adopting a deposition mode. Preferably, the photochromic layer can be colorless, i.e., transparent in a normal state. During manufacturing, the photochromic gradient color layer is printed on the substrate, namely, the photochromic material is mixed into the transparent imprinting glue, and the photochromic layer with the thickness gradually increasing (thickening) or gradually decreasing (thinning) from one side is imprinted. Compared with the color-changing schemes (such as electrochromism) of other embodiments, the photochromic gradual-changing membrane of the embodiment has the advantages of simple structure, simple manufacturing process and no need of additional scarce energy, can realize color change and color gradual change (namely, visible light color change and visual effect with color gradual change are realized under the irradiation of light) by utilizing light (such as sunlight and ultraviolet light), can change the appearance on the premise of not changing a decorative (membrane) piece, and brings new visual experience and 'dynamic' for consumers.

As a variation of the embodiment of fig. 1, as shown in fig. 2, which is a schematic structural diagram of a second embodiment of the photochromic gradient film, a photochromic gradient film 20 has a substrate 21 and a photochromic layer 22, a groove 23 for accommodating a photochromic material is configured in the photochromic layer 22, and the groove 23 is arranged in a gradient manner (for example, by setting one or a combination of parameters of depth, width, duty ratio, and the like of the groove 23). In this embodiment, the base material 21 is a PET film having a thickness of 50 to 200 μm. In other embodiments, other materials as described above may be used for the substrate. Preferably, the width of the groove 23 varies, such as a periodic variation of the width of the groove 23 from 3.5 μm to 2 μm to 0.2 μm.

During manufacturing, a printing mode of nano printing is preferably adopted, and the photochromic layer comprises the following steps during manufacturing:

s1, pressing texture on a transparent substrate 21 by using transparent pressing glue, wherein the transparent substrate comprises a groove for containing photochromic materials, namely UV pressing texture;

s2, filling the photochromic ink into the UV embossed texture. In S1, the transparent imprint glue is solvent-free uv-curable acrylic resin, and preferably, in one embodiment, the width of the groove varies from 5.5 μm to 3.5 μm to 0.5 μm, and the groove network on the surface of the transparent imprint glue is linear array (in other embodiments, the groove network is not limited to linear array). S2, the photochromic ink is a transparent ink containing resin, curing agent, diluent, leveling agent, etc. and is prepared by adding resin, curing agent, diluent, leveling agent, etc. to the solution or dispersion of photochromic material. And after the photochromic ink is filled in the transparent impression glue, the photochromic ink is uniformly filled at the bottom of the groove of the transparent impression glue.

In one embodiment, the photochromic layer may be formed by screen printing, offset printing, or the like. In the production of the photochromic layer, the photochromic layer is disposed on the transparent substrate by printing using screen printing or offset printing. Wherein the substrate can be a PET film with a thickness of 50-200 μm. The photochromic ink is gradually distributed on the surface of the base material, and the thickness of the photochromic ink is 3-5 mu m.

In one embodiment, the photochromic layer is formed by ink-jet printing, and the ink-jet printing is performed on the base material by changing a single color or two-color hue at the time of forming the photochromic layer. The base material is a PET film with a thickness of 50-200 μm. The photochromic ink is gradually distributed on the surface of the base material, and the thickness of the photochromic ink is 0-5 mu m. The single color ink-jet printing (as shown in fig. 1) refers to that photochromic ink with a single color is sprayed on a substrate after color concentration is adjusted, the two-color ink-jet printing refers to that photochromic ink with two colors (two different colors) is sprayed on the substrate after color concentration is adjusted by mixing and is sprayed on the substrate or the photochromic ink with two laminated hues is sprayed on the substrate, and the colors of the photochromic ink comprise red, yellow, blue and purple phases.

The single-layer photochromic structure adopted in the photochromic gradient film of the embodiment is further optimized by the inventor, namely, a color gradient layer (such as a color gradient modification layer or an ultraviolet-resistant gradient color layer, which is referred to as a gradient color layer for short) is added, and the color gradient layer is combined with the photochromic layer to achieve a better visual effect of photochromic gradient. Preferably, the method adopts a laminated structure, so that the requirement on the photochromic material can be reduced. Provides the straight rate for manufacturing the photochromic gradual-change film.

As shown in fig. 3, a schematic structural diagram of a third embodiment of a photochromic gradient film, the photochromic gradient film 30 includes a substrate 31, a first photochromic layer 31, and a second photochromic layer 32. After the two-layer photochromic structure is discolored, the combination of 2 lights with the same color or different colors (influenced by the thickness) enables the whole photochromic gradual-changing film to show gradual change.

Fig. 4 shows a modification of the embodiment of fig. 3, which is a schematic structural diagram of a photochromic gradient film 40 according to a fourth embodiment of the present application, and the photochromic gradient film 40 includes a substrate 41, a common gradient color layer 42, and a photochromic layer 43, wherein the photochromic layer 43 is laminated on the common gradient color layer 42. In one embodiment, the positions of the ordinary gradient color layer 42 and the photochromic layer 43 are interchanged. In one embodiment, the common gradient color layer 42 may also be a first photochromic layer or a photochromic layer 43 (a second photochromic layer).

Fig. 5 is a schematic structural diagram of a photochromic gradient film according to a fifth embodiment of the present application. The photochromic gradient film 50 comprises a substrate 51, a photochromic layer 52 and a gradient color layer 53, wherein the photochromic layer 52 is laminated on the transparent substrate 51, and the gradient color layer 53 is laminated on the photochromic layer. In this embodiment, the gradient color layer 53 is a gradient color layer (in other embodiments, a plurality of gradient color layers) or an ultraviolet-resistant gradient color layer (in other embodiments, a plurality of ultraviolet-resistant gradient color layers). The photochromic layer may be graded or uniform in color. In one embodiment, the photochromic layer 52 and the gradient color layer 53 are disposed on both sides of the substrate 51 (as shown in fig. 6, the photochromic layer 62 and the gradient color layer 63 are disposed on both sides of the substrate 61, and the thickness of the gradient color layer 63 is gradually increased from one side to the other side in the x direction). At this time, the photochromic gradual change film is applied to the occasion with light, the light firstly passes through the gradual change color layer 53/63 (gradual change color film layer or ultraviolet-resistant gradual change color layer) and then irradiates on the photochromic layer, and the gradual change color layer 53/63 has the characteristic of blocking ultraviolet rays, so that the light intensity received by the photochromic layer 52/62 is gradually changed, the use of the uniform photochromic layer can also generate gradual change color, and the processing technology of the uniform film layer is simpler than that of the gradual change ink layer. In other embodiments, the graded color layer 53/63 includes a color film layer with a graded characteristic, such that the photochromic graded film exhibits a graded characteristic and has a richer color effect. The gradient color layer 53/63 can be prepared by ink jet printing, offset printing, screen printing.

During the manufacture, the gradual change color nanometer ink layer is printed on the base material, and the printing method comprises the following steps: ink jet, offset, screen printing, etc.; the uniform or graded photochromic layer is then printed by screen printing or offset printing. Wherein, the base material adopts a PET film with the thickness of 50-200 μm. The thickness of the ink layer with gradually changed colors printed by ink-jet printing, offset printing and silk-screen printing is changed, such as 3-2-0.2 μm. The photochromic ink is uniformly distributed on the surface of the color modification ink layer, and the thickness of the photochromic ink is about 8-10 mu m.

In the above embodiment, if the gradation color layer is an ultraviolet blocking gradation color layer, it has a function of gradation of ultraviolet transmittance, and an ultraviolet blocking layer containing an ultraviolet blocking agent, such as TiO2, ZnO, or an ultraviolet absorber, or a vacuum-deposited TiO2 layer, or a known ultraviolet blocking optical film layer by interference, is printed therein. The ultraviolet resistant nano material is a series of ultraviolet resistant agents which have absorption or refraction effects on sunlight and have better transparency after being coated into a film, and can be TiO2, ZnO, ultraviolet absorbers and the like. The wavelength band blocked by ultraviolet rays refers to a wavelength band that can cause the photochromic film to undergo a significant reversible color change within a time range. The thickness of the uvioresistant nano ink layer is periodically changed, for example, the thickness is changed from about 3.5 μm to 2 μm to 0.2 μm. The photochromic layer is uniformly distributed on the surface of the ultraviolet-resistant layer, and the thickness of the photochromic layer is 8-10 mu m.

Fig. 7 is a schematic structural diagram of a photochromic gradient film according to a seventh embodiment of the present application. The photochromic gradient film 70 comprises a substrate 71, a gradient color layer 72 and a photochromic layer 74, wherein the gradient color layer 72 comprises a groove (also called a groove) 73, an oil film is filled in the groove network to form a color, the width and the depth of the groove are set according to a certain rule to form the color gradient film layer 72, and the photochromic layer 74 is laminated on the groove. The photochromic layer 74 is of uniform thickness.

As a variation of the embodiment of fig. 7, fig. 8 shows a schematic structural diagram of a photochromic gradient film, which is different in that the gradient color layer and the photochromic layer are located on two sides of the substrate. The photochromic gradient film 80 comprises a substrate 81, a gradient color layer 82 and a photochromic layer 84, wherein the gradient color layer (also called as a texture layer) 82 comprises a groove (also called as a groove and a groove texture) 83 filled with an oil film to form a color, the width and the depth of the groove are set according to a certain rule to form the color gradient film layer 82, and the photochromic layer 84 is arranged on the other side of the substrate 81 opposite to the gradient color layer 82. The photochromic layer 84 is of uniform thickness.

As a variation of the embodiment of fig. 7, a schematic structural diagram of a photochromic gradient film is shown in fig. 9, which is different in that the thickness of the photochromic layer gradually increases or decreases from one side to the other side. The photochromic gradient film 90 comprises a substrate 91, a gradient color layer 92 and a photochromic layer 94, wherein the gradient color layer 92 comprises a groove (also called a groove) 93, an oil film is filled in the groove network to form a color, the width and the depth of the groove are set according to a certain rule to form a color gradient film layer 72, and the photochromic layer 92 is laminated on the groove. The photochromic layer 94 has a thickness that gradually increases or decreases from side to side (for a description of the thickness, please refer to fig. 6).

As a modification of the embodiment of fig. 7, as shown in fig. 10, a schematic structural diagram of a photochromic gradient film is shown, and the difference is that a micro-nano structure layer is arranged on the other side of the base material opposite to the gradient color layer, and the optical effect of the photochromic gradient film is improved by such a design. A photochromic gradient film 100, comprising a substrate 101, a gradient color layer 102, and a photochromic layer 104, wherein the gradient color layer 102 comprises a groove (also called a groove or a groove texture) 103 filled with an oil film to form a color, the width and depth of the groove are set according to a certain rule to form the color gradient film 102, and the photochromic layer 104 is stacked thereon (the thickness of the photochromic layer 104 may be the same or gradually increases/decreases from one side to the other side, the description of the thickness refers to fig. 6); a micro-nano structure layer 105 is arranged on the other side of the substrate 101 opposite to the gradient color layer 102. Preferably, the micro-nano structure layer 105 includes a plurality of lenses.

As a modification of the embodiment of fig. 10, a schematic structural view of a photochromic gradient film is shown in fig. 11, which is different in that a reflective layer and/or a colored layer are sequentially laminated on a micro-nano structure layer. A photochromic gradient film 110, comprising a substrate 111, a gradient color layer 112, and a photochromic layer 114, wherein the gradient color layer 112 comprises a groove (also called a groove or a groove texture) 113 filled with an oil film to form a color, the width and depth of the groove are set according to a certain rule to form the color gradient film 112, and the photochromic layer 114 is stacked thereon (the thickness of the photochromic layer 1104 can be uniform or gradually increased/decreased from one side to the other side); a micro-nano structure layer 115 is disposed on the other side of the substrate 111 facing the gradation layer 112, and a reflective layer 116 and a colored layer 117 are sequentially stacked thereon. The micro-nano structure layer 105 includes a plurality of lenses. The optical effect of the photochromic gradient film is improved through the design.

In this embodiment, the base 71 is a PET film with a thickness of 50 to 200 μm. When the photochromic gradual-change film is manufactured, the photochromic gradual-change film comprises,

s11, UV imprinting textures, namely, stamping groove textures 73 on the transparent base material 71 by using transparent imprinting glue;

s12, manufacturing a color gradient layer, namely filling a color nano oil film into a groove network of the UV impressing texture to form a color gradient film 72;

s13. printing a photochromic layer 74. Preferably, the photochromic layer 74 is screen printed. The photochromic layer 74 is uniform in thickness or graded in thickness.

In S11(UV texture stamping process), the transparent stamping glue is solvent-free UV-curable acrylic resin with a thickness of 5.5-3.5-0.5 μm, and the groove network on the surface of the transparent stamping glue is preferably linear array.

And S12 (printing process of color nano ink), after filling the transparent impression glue with the color nano ink, uniformly filling the color nano ink into the bottom of the groove of the transparent impression glue and communicating the color nano ink with the groove, wherein the thickness of the color nano ink layer is about 3.5-2-0.2 μm.

The photochromic ink is uniformly distributed on the surface of the color modification ink layer, and the thickness of the photochromic ink is 8-10 mu m.

In one embodiment, the photochromic gradient film comprises a protective layer, which is stacked on the photochromic layer, on one side of the substrate, and on the color gradient layer, and has a protective function to prolong the service life of the film.

The photochromic gradual-change film in the embodiment can be used as a decorative film and used for shells of household appliances, various intelligent terminals and shells of electronic products.

In the design of the photochromic gradual change membrane of the embodiment, the photochromic gradual change membrane comprises the base material and the photochromic layer, wherein the photochromic layer changes color under the irradiation of light (such as sunlight) and has a gradual change effect, so that the appearance can be visually changed on the premise of not changing the decorative part, and various visual new experiences and dynamic effects are brought to consumers.

In the design of the substrate, a transparent substrate, such as one selected from glass, quartz, transparent plastic substrate, ceramic, etc., or one or a combination of PET film, transparent PI film, PEN film, nano cellulose paper, or explosion-proof film, etc., can be used.

In the design of the photochromic layer, which comprises a photochromic material, the photochromic layer exhibits a color gradient characteristic in at least one color change state. The thickness of the photochromic layer may be gradually increased (thickened)/decreased (thinned) from one side to the other side, so that the photochromic layer is subjected to photochromism under the irradiation of light, and the color of the photochromic layer is characterized by gradual change due to the film thickness. Preferably, the photochromic material-containing ink is prepared by processes of nano printing, ink-jet printing, silk screen printing, offset printing and the like or by adopting a deposition mode. Preferably, the photochromic layer can be colorless, i.e., transparent in a normal state. Compared with other color-changing schemes (such as electrochromism), the photochromic gradual-changing film has the characteristics of simple structure and no need of adding a scarce energy source during manufacturing, and can be realized by light (such as sunlight and ultraviolet light) during utilization.

In the design of the photochromic layer, a groove is arranged in the photochromic layer, the photochromic material is filled in the groove, and the characteristic of photochromic color gradual change is realized through the gradual change setting of parameters such as the depth, the width, the duty ratio and the like of the groove.

In the design of the photochromic layer, it may comprise a gradient color layer, the photochromic layer realizing the characteristic of photochromic color gradient through the combination thereof.

In the design of the photochromic layer, the film thickness thereof may be gradually increased/decreased from one side to the other side, achieving the characteristic of color gradation. The photochromic layer is matched with the photochromic layer to realize the characteristic of photochromic gradual change.

In the design of the photochromic layer, a groove is arranged in the photochromic layer, pigment is filled in the groove, and the characteristic of color gradual change (sometimes called as a texture layer) is realized by the gradual change of parameters such as the depth, the width, the duty ratio and the like of the groove, and the characteristic of photochromic color gradual change is realized by the cooperation of the groove and the photochromic layer.

In the design of the gradient color layer, it can be a layer of gradient color film or an uvioresistant gradient color layer. The photochromic layer is graded or uniform in color. The photochromic layer and the gradient color layer can be arranged on the same side of the substrate or arranged on two sides of the substrate. Preferably, the light passes through the gradient color layer before being irradiated on the photochromic layer when being disposed on both sides of the substrate.

It should be noted that in other embodiments, for the same photochromic gradient film, only one or more of the features of "substrate", "photochromic layer", "gradient color layer", "texture layer", "color gradient modification layer", "anti-uv gradient color layer", "protection layer" may be included. That is, the above features can be combined in any arrangement and used for the improvement of the photochromic gradient film.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A photochromic gradual-changing film is characterized by comprising

A base material, a photochromic layer stacked on one side of the base material,

2. The photochromic gradient film of claim 1 further comprising another photochromic layer laminated to the same side or another side of said substrate.

3. The photochromic gradient film of claim 1 further comprising a gradient color layer laminated to the same side or the other side of said substrate.

4. The photochromic gradient film of claim 1 wherein,

the substrate is selected from one or the combination of glass, quartz, transparent plastic substrate, ceramic substrate, PET film, transparent PI film, PEN film, nano cellulose paper and explosion-proof film.

5. The photochromic gradient membrane of claim 1, further comprising a micro-nano structure disposed on one side of the substrate, wherein the micro-nano structure comprises a plurality of microlenses, or a reflective layer and/or a colored layer is further laminated on the micro-nano structure.

6. A photochromic gradient film, comprising:

a substrate;

7. The photochromic gradient membrane of claim 6, wherein the thickness of the photochromic layer is uniformly arranged or gradually arranged from one side to the other side, gradually increasing or gradually decreasing.

8. The photochromic gradient film of claim 6, wherein the photochromic layer has a uniform thickness and comprises a first photochromic layer, a second photochromic layer or a gradient color layer laminated thereon,

the thickness of the first photochromic layer gradually increases from one side to the other side,

9. The photochromic gradient film of claim 6, wherein the photochromic layer has a uniform thickness and comprises a plurality of grooves having a configuration of varying width, depth or duty cycle, the grooves being filled with a photochromic material.

10. A cover plate carrying a photochromic gradient film according to any one of claims 1 to 9.