EP-4741916-A1 - ELECTROCHROMIC FILM, COLOR-CHANGING DEVICE, AND TERMINAL PRODUCT

EP4741916A1EP 4741916 A1EP4741916 A1EP 4741916A1EP-4741916-A1

Abstract

The present application provides an electrochromic film, a color-changing device, and a terminal product, relating to the field of electrochromic technology. The electrochromic film includes a central portion and an edge portion adjacent to the central portion, the edge portion being electrically connected to a busbar; at least a local region of the edge portion is provided with a blocking portion, through which the current of the busbar is blocked or reduced from being conducted from the blocking portion to the central portion. By providing blocking portion at the edge of the electrochromic film, the current from the busbar is blocked or reduced from being conducted from the blocking portion to the central portion of the electrochromic film. This prevents current from directly flowing from the conductive layer provided with the blocking portion to the conductive layer in the central portion, or reduces the current flowing from the conductive layer provided with the blocking portion to the conductive layer in the central portion. This avoids failure caused by overcharging or over-discharging in the corner regions of the electrochromic film, thereby improving the stability and uniformity of the electric field strength of the electrochromic film and extending the service life of the electrochromic film.

Inventors

WANG, Weishu
LU, Yicai

Assignees

Guangyi Intelligent Tech (Suzhou) Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240614

Claims (20)

An electrochromic film, comprising a central portion and an edge portion adjacent to and connected to the central portion, and the edge portion being electrically connected to a busbar; wherein at least a local region of the edge portion is provided with a blocking portion, such that a current from the busbar is blocked or reduced from being conducted toward the central portion at the location of the blocking portion.
The electrochromic film according to claim 1, wherein the blocking portion is located at a corner of the edge portion.
The electrochromic film according to claim 2, wherein the corner comprises a vertex and two ends with edges connected to each other, the edge portion located between two points is divided into a first segment and a second segment, when a line tangent to the first segment through a point is a first tangent line, and a line tangent to the second segment through the point is a second tangent line; wherein the angle between the first tangent line and the second tangent line is less than 135°, then the point is the vertex of the corner; or a perpendicular distance from any point on the edge portion corresponding to two points at a first preset distance to a line segment connecting the two points is a second preset distance; when the second preset distance is greater than n times the first preset distance, n ranges from 5% to 10%, and the edge portion corresponding to the two points is the corner.
The electrochromic film according to claim 3, wherein a value of the first preset distance ranges from 30 mm to 300 mm.
The electrochromic film according to claim 1, wherein the blocking portion comprises an etched region formed by etching a portion of a conductive layer and/or a component with a resistance greater than that of the busbar.
The electrochromic film according to claim 5, wherein the blocking portion at least penetrates through the conductive layer of the edge portion in contact with the busbar and is located on a side of the busbar adjacent to the central portion; and/or the blocking portion is disposed between the busbar and the conductive layer, and a resistance of the blocking portion is greater than a resistance of the busbar.
The electrochromic film according to claim 1, wherein the electrochromic film comprises a first substrate layer, a first conductive layer, an electrochromic layer, a second conductive layer, and a second substrate layer stacked sequentially; the edge portion is provided with a first groove and a second groove, and the busbar comprises a first busbar and a second busbar; the first groove penetrates through the first substrate layer, the first conductive layer, and the electrochromic layer along a thickness direction of the electrochromic film to expose a portion of the second conductive layer, forming a first electrode, and the first electrode is electrically connected to the first busbar; and the second groove penetrates through the second substrate layer, the second conductive layer, and the electrochromic layer along the thickness direction of the electrochromic film to expose a portion of the first conductive layer, forming a second electrode, and the second electrode is electrically connected to the second busbar.
The electrochromic film according to claim 7, wherein the blocking portion arranged corresponding to the first electrode penetrates through the second conductive layer, and/or the blocking portion arranged corresponding to the second electrode penetrates through the first conductive layer.
The electrochromic film according to claim 8, wherein the blocking portion insulates and separates the first electrode from the central region of the first conductive layer, and/or the blocking portion insulates and separates the second electrode from the central region of the second conductive layer.
The electrochromic film according to claim 7, wherein the first electrode comprises a first straight-edge electrode and a first corner electrode, the first corner electrode is located at the corner of the electrochromic film, the first corner electrode and the first straight-edge electrode are spaced apart from each other on the edge portion, and the blocking portion is disposed corresponding to the first corner electrode; and/or the second electrode comprises a second straight-edge electrode and a second corner electrode, the second corner electrode is located at the corner of the electrochromic film, the second corner electrode and the second straight-edge electrode are spaced apart from each other on the edge portion, and the blocking portion is disposed corresponding to the second corner electrode.
The electrochromic film according to claim 7, wherein the blocking portion penetrates through at least the first conductive layer and the second conductive layer.
The electrochromic film according to claim 7, wherein the blocking portion penetrates through the first conductive layer, the electrochromic layer, and the second conductive layer; and the blocking portion further penetrates through the first substrate and/or the second substrate.
The electrochromic film according to claim 9, wherein a total length of the blocking portion is less than a sum of lengths of the first straight-edge electrode and the second straight-edge electrode.
The electrochromic film according to claim 10, wherein a length of the blocking portion is not less than a length of the first corner electrode, and/or a length of the blocking portion is not less than a length of the second corner electrode.
The electrochromic film according to claim 14, wherein the blocking portion extends along at least one of extending directions of the first corner electrode, and extends to be located between the first corner electrode and an adjacent first straight-edge electrode; and/or the blocking portion extends along at least one of extending directions of the second corner electrode, and extends to be located between the second corner electrode and an adjacent second straight-edge electrode.
The electrochromic film according to claim 14, wherein the blocking portion forms a blocking region with an outer edge of the electrochromic film, the first corner electrode is located in the blocking region, and/or the second corner electrode is located in the blocking region.
The electrochromic film according to any one of claims 1-16, wherein the blocking portion is a linear structure, and the linear structure comprising at least one of a straight line, a broken line, a curve, and an arc.
The electrochromic film according to any one of claims 1-16, wherein the blocking portion is a planar structure, and the planar structure comprising at least one of a polygon, a sector, and an arc surface.
The electrochromic film according to any one of claims 1-16, wherein a distance between the blocking portion and the busbar ranges from 0.3 mm to 20 mm.
The electrochromic film according to claim 19, wherein the distance between the blocking portion and the busbar is 1 mm.

Description

CROSS REFERENCE TO RELATED APPLICATIONS The present application claims priority to Chinese Patent Application No. 2023108129363, filed on July 4, 2023, entitled "electrochromic film, color-changing device, and terminal product," the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present application relates to the technical field of electrochromism, and more particularly to an electrochromic film, a color-changing device, and a terminal product. BACKGROUND Electrochromism is a technology in which electrochromic materials undergo reversible and stable coloring and bleaching under the action of an external voltage. Typically, by setting busbars on the two substrate layers of an electrochromic film, the electrochromic film is electrically connected to an external power source through the busbars, thereby forming a voltage across the two ends of the electrochromic material, causing the electrochromic material of the electrochromic film to change color in response to changes in the voltage across the two ends. Currently, during use, the color-changing endpoint of the electrochromic film in the corner region of the film fails to reach the preset transmittance and thus fails prematurely. SUMMARY In view of this, it is an objective of the present application to overcome the shortcomings of the prior art and provide an electrochromic film, a color-changing device, and a terminal product. The present application provides the following technical solution: an electrochromic film, and the electrochromic film includes a central portion and an edge portion adjacent to and connected to the central portion, and the edge portion being electrically connected to a busbar; at least a local region of the edge portion is provided with a blocking portion, such that a current from the busbar is blocked or reduced from being conducted toward the central portion at the location of the blocking portion. Optionally, the blocking portion is located at a corner of the edge portion. Optionally, the corner includes a vertex and two ends with edges connected to each other, the edge portion located between two points is divided into a first segment and a second segment, when a line tangent to the first segment through a point is a first tangent line, and a line tangent to the second segment through the point is a second tangent line; and the angle between the first tangent line and the second tangent line is less than 135°, then the point is the vertex of the corner; or, a perpendicular distance from any point on the edge portion corresponding to two points at a first preset distance to a line segment connecting the two points is a second preset distance; when the second preset distance is greater than n times the first preset distance, n ranges from 5% to 10%, and the edge portion corresponding to the two points is the corner. Optionally, a value of the first preset distance ranges from 30 mm to 300 mm. Optionally, the blocking portion includes an etched region formed by etching a portion of a conductive layer and/or a component with a resistance greater than that of the busbar. Optionally, the blocking portion at least penetrates through the conductive layer of the edge portion in contact with the busbar and is located on a side of the busbar adjacent to the central portion; and/or the blocking portion is disposed between the busbar and the conductive layer, and a resistance of the blocking portion is greater than a resistance of the busbar. Optionally, the electrochromic film includes a first substrate layer, a first conductive layer, an electrochromic layer, a second conductive layer, and a second substrate layer stacked sequentially; the edge portion is provided with a first groove and a second groove, and the busbar includes a first busbar and a second busbar; the first groove penetrates through the first substrate layer, the first conductive layer, and the electrochromic layer along a thickness direction of the electrochromic film to expose a portion of the second conductive layer, forming a first electrode, and the first electrode is electrically connected to the first busbar; andthe second groove penetrates through the second substrate layer, the second conductive layer, and the electrochromic layer along the thickness direction of the electrochromic film to expose a portion of the first conductive layer, forming a second electrode, and the second electrode is electrically connected to the second busbar. Optionally, the blocking portion arranged corresponding to the first electrode penetrates through the second conductive layer, and/or the blocking portion arranged corresponding to the second electrode penetrates through the first conductive layer. Optionally, the blocking portion insulates and separates the first electrode from the central region of the first conductive layer, and/or the blocking portion insulates and separates the second electrode from the central region of the second conductive