CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims priority to Chinese Patent Application No. 201910531772.0, filed on Jun. 19, 2019, the content of which is herein incorporated by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the technical field of electronic devices, in particular relates to a film structure, a shell, and an electronic device.

BACKGROUND

With the development of the diversity of the electronic devices, users put forward higher requirements for the appearance of the electronic devices. It is a research and development direction of common concern in the industry that how to improve the appearance effect of the electronic devices. In some researches, the offset printing technology is applied to transfer printing patterns to the electronic devices to make the electronic devices present patterns. However, the pattern acquired in this way has single style.

SUMMARY

Therefore, it is necessary to provide a film structure with pattern with more styles.

Furthermore, a method for manufacturing the film structure, a shell, and an electronic device are provided.

A film structure, comprising: a first film assembly, comprising a first film and a texture layer stacked on one another sequentially; and a second film assembly, comprising a second film and a ribbon unit disposed on the second film, wherein the second film assembly is stacked on the first film assembly, the ribbon unit is located adjacent to the first film, and an orthographic projection of the ribbon unit projected on a plane on which the texture layer is located falls in the texture layer.

In some embodiments, the texture layer comprises a first texture area, a plurality of first convex bars parallel to each other and a plurality of second convex bars parallel to each other are disposed in the first texture area; the plurality of first convex bars and the plurality of second convex bars are alternately arranged, and a height of each second convex bar is less than a height of each first convex bar.

In some embodiments, each of the plurality of first convex bars and an adjacent one of the plurality of second convex bars are arranged without a gap.

In some embodiments, the texture layer comprises a first texture area, a plurality of convex bar groups spaced apart from each other are disposed in the first texture area, each convex bar group comprises a first convex bar and a second convex bar parallel to and spliced with each other, and a height of each second convex bar is less than a height of the first convex bar.

In some embodiments, the plurality of convex bar groups are arranged in an array.

In some embodiments, a cross section of each first convex bar in a direction perpendicular to an extension direction of the first convex bar is in shape of a triangle or a trapezoid; and/or a cross section of each second convex bar in a direction perpendicular to an extension direction of the second convex bar is in shape of a triangle or a trapezoid.

In some embodiments, the cross section of each first convex bar in the direction perpendicular to the extension direction of the first convex bar is in shape of an isosceles triangle; and/or the cross section of each second convex bar in the direction perpendicular to the extension direction of the second convex bar is in shape of an isosceles triangle.

In some embodiments, a height difference between the first convex bar and the second convex bar is in a range from 2 μm to 4 μm.

In some embodiments, a width of the first convex bar is equal to a width of the second convex bar.

In some embodiments, the ribbon unit comprises a first ribbon area, a position of the first ribbon area corresponds to a position of the first texture area, and an orthographic projection of the first ribbon area projected on a plane on which the first texture area is located falls in the first texture area.

In some embodiments, the ribbon unit comprises a first monochrome layer and a gradient color layer disposed in the first ribbon area, the first monochrome layer is disposed on the second film, and the gradient color layer is disposed at one side of the first monochrome layer away from the second film.

In some embodiments, an orthographic projection of the first ribbon area projected on a plane on which the first texture area is located coincides with the first texture area completely.

In some embodiments, the texture layer comprises a second texture area, and a plurality of third convex bars parallel to each other are disposed in the second texture area.

In some embodiments, a cross section of each third convex bar in a direction perpendicular to an extension direction of the third convex bar is in shape of a triangle or a trapezoid.

In some embodiments, the ribbon unit comprises a second ribbon area, a position of the second ribbon area corresponds to a position of the second texture area, and an orthographic projection of the second ribbon area projected on a plane on which the second texture area is located falls in the second texture area.

In some embodiments, the orthographic projection of the second ribbon area on the plane on which the second texture area is located coincides with the second texture area completely.

In some embodiments, the ribbon unit comprises a plurality of second monochrome layers in the second ribbon area, and the plurality of second monochrome layers are stacked on the second film sequentially.

In some embodiments, the first film assembly further comprises a reflection unit, and the reflection unit is coated at one side of the texture layer away from the first film.

In some embodiments, the reflection unit comprises: an attaching layer, disposed at one side of the texture layer away from the first film; a first refraction layer, disposed at one side of the attaching layer away from the texture layer; and a second refraction layer, disposed at one side of the first refraction layer away from the attaching layer, and a refractive index of the first refraction layer is less than a refractive index of the second refraction layer.

In some embodiments, the refractive index of the first refraction layer is in a range from 0.68 to 0.72, and the refractive index of the second refraction layer is in a range from 2.55 to 2.76.

In some embodiments, the reflection unit further comprises an interlayer, the interlayer is located between the first refraction layer and the second refraction layer, and the interlayer is an alumina layer or a silicon dioxide layer.

In some embodiments, the attaching layer is an alumina layer, and a thickness of the attaching layer is in a range from 30 nm to 40 nm; the first refraction layer is an indium layer, and a thickness of the first refraction layer is in a range from 10 nm to 30 nm; the interlayer is an alumina layer, and a thickness of the interlayer is in a range from 30 nm to 40 nm; and the second refraction layer is a titanium dioxide layer, and a thickness of the second refraction layer is in a range from 3 nm to 7 nm.

In some embodiments, the reflection unit further comprises a third refraction layer, the third refraction layer is located between the attaching layer and the first refraction layer, and a refractive index of the third refraction layer is greater than the refractive index of the first refraction layer.

In some embodiments, the refractive index of the third layer is in a range from 2.55 to 2.76.

In some embodiments, the reflection unit further comprises a first protection layer and a second protection layer, the first protection layer is located between the first refraction layer and the third refraction layer, the second protection layer is located between the first refraction layer and the second refraction layer, the first protection layer is an alumina layer or a silicon dioxide layer, and the second protection layer is an alumina layer or a silicon dioxide layer.

In some embodiments, the attaching layer is a silicon dioxide layer, and a thickness of the attaching layer is in a range from 8 nm to 12 nm; the third refraction layer is a trititanium pentoxide layer, and a thickness of the third refraction layer is in a range from 7 nm to 17 nm; the first protection layer is a silicon dioxide layer, and the thickness of the first protection layer is in a range from 10 nm to 20 nm; the first refraction layer is an indium layer, and a thickness of the first refraction layer is in a range from 10 nm to 20 nm; the second protection layer is a silicon dioxide layer, and a thickness of the second protection layer is in a range from 20 nm to 30 nm; and the second refraction layer is a trititanium pentoxide layer, and a thickness of the second refraction layer is in a range from 5 nm to 9 nm.

In some embodiments, the first film assembly further comprises an ink layer, and the ink layer is coated at one side of the reflection unit away from the texture layer.

A method for manufacturing a film structure, comprising:

providing a first film assembly, wherein the first film assembly comprises a first film and a texture layer stacked on one another sequentially; forming a ribbon unit on a second film by a color-band transfer-printing process, and acquiring a second film assembly; attaching one side of the ribbon unit away from the second film to one side of the first film away from the texture layer, such that an orthographic projection of the ribbon unit projected on the texture layer falls on the texture layer, thereby acquiring the film structure.

In some embodiments, before attaching one side of the ribbon unit away from the second film to one side of the first film away from the texture layer, further comprising an operation of manufacturing the first film assembly; wherein the manufacturing the first film assembly comprises: forming the texture layer on the first film by a UV transfer-printing process, thereby acquiring the film assembly.

In some embodiments, the forming the texture layer on the first film comprises:

disposing a plurality of first convex bars parallel to each other and a plurality of second convex bars parallel to each other on the first film to form a first texture area and acquiring the texture layer; wherein the plurality of first convex bars and the plurality of second convex bars are alternately arranged, and a height of each second convex bar is less than a height of each first convex bar.

In some embodiments, the forming the ribbon unit on the second film by the color-band transfer-printing process comprises: forming a first monochrome layer and a gradient color layer on the second film by the color-band transfer-printing process, and the gradient color layer is disposed at one side of the first monochrome layer away from the second film, thereby forming a the first ribbon area and acquiring the ribbon unit; a position of the first ribbon area corresponds to a position of the first texture area.

In some embodiments, the forming the texture layer on the first film comprises:

forming a plurality of third convex bars parallel to each other on the first film, thereby forming a second texture area and acquiring the texture layer.

In some embodiments, the forming the ribbon unit on the second film by the color-band transfer-printing process comprises: sequentially disposing a plurality of second monochrome layers on the second film by the color-band transfer-printing process, thereby forming a second ribbon area and acquiring the ribbon unit; wherein a position of the second ribbon area corresponds to a position of the second texture area.

A shell, comprising: a substrate; and the film structure as previously described, wherein the film structure is located on the substrate, and one side of the film structure adjacent to the second film faces towards the substrate.

An electronic device, comprising: the shell as previously described; a display connected to the shell, wherein an installation room is defined by the display and the shell; and a circuit board, located in the installation room and electrically connected to the display.

