EP-4741918-A1 - ELECTROCHROMIC DIAPHRAGM, COLOR-CHANGING APPARATUS, AND TERMINAL PRODUCT

EP4741918A1EP 4741918 A1EP4741918 A1EP 4741918A1EP-4741918-A1

Abstract

The present application provides an electrochromic film, a color-changing device and a terminal product, belonging to the field of electrochromic technology. The electrochromic film includes an edge portion; the edge portion includes a corner portion and a straight-edge portion, the corner portion is provided with a corner electrode, the straight-edge portion is provided with straight-edge electrodes, and the straight-edge electrodes and the corner electrode are spaced apart; the electrochromic film also includes at least one of the following features: the length of the corner electrode is L 1 , the average length of the straight-edge electrodes is L 2 , and L 2 < L 1 ; the corner electrode includes a first side extending along a first direction and a second side extending along a second direction, the included angle α between the first side and the second side is in the range of 45° ≤ α ≤ 135°; the perimeter of the edge portion is D, the corner electrode is arc-shaped, and the radius of the corner electrode is N. The value of N is in the range of 1/9 × D ≤ N. This effectively avoids accelerated aging of the corner portion and achieves a balance of electric field intensity at the edge portion of the film.

Inventors

WANG, Weishu
LU, Yicai

Assignees

Guangyi Intelligent Tech (Suzhou) Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240614

Claims (16)

An electrochromic film, comprising an edge portion; wherein the edge portion comprises a corner portion and a straight-edge portion, the corner portion is correspondingly provided with a corner electrode, the straight-edge portion is correspondingly provided with straight-edge electrodes, and the straight-edge electrodes are spaced apart from the corner electrode; the electrochromic film further comprises at least one of following features: a length of the corner electrode is L 1 , an average length of the straight-edge electrodes is L 2 , and L 2 < L 1 ; the corner electrode comprises a first side extending along a first direction and a second side extending along a second direction, an included angle α between the first side and the second side is in a range of 45° ≤ α ≤ 135°; and a perimeter of the edge portion is D, the corner electrode is arc-shaped, and a radius of the corner electrode is N, wherein a value of N is in a range of 1/9 × D ≤ N.
The electrochromic film according to claim 1, wherein the L 1 and the L 2 satisfy a condition that: L 2 < L 1 < 4 × L 2 .
The electrochromic film according to claim 2, wherein a difference between the L 1 and the L 2 is greater than 20% of the L 2 .
The electrochromic film according to claim 1, wherein a straight-line distance between two ends of the corner electrode is L, wherein the L and the L 2 satisfy a condition that: L 2 < L.
The electrochromic film according to claim 1, wherein a first interval region is provided between the corner electrode and a straight-edge electrode adjacent to the corner electrode, a length of the first interval region is L 3 ; a second interval region is provided between the adjacent straight-edge electrodes, a length of the second interval region is L 4 ; wherein L 4 ≤ L 3 .
The electrochromic film according to claim 1, wherein the corner electrode protrudes towards the corner portion.
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 of the electrochromic film is provided with a first groove and a second groove; the electrochromic film is electrically connected to a busbar, the busbar comprises a first busbar and a second busbar, the corner electrode comprises a first corner electrode and a second corner electrode, and the straight-edge electrodes comprise a first straight-edge electrode and a second straight-edge electrode; 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 the first corner electrode and the first straight-edge electrode, and the first corner electrode and the first straight-edge electrode are 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 the second corner electrode and the second straight-edge electrode, and the second corner electrode and the second straight-edge electrode are electrically connected to the second busbar.
The electrochromic film according to claim 1, wherein the value of α is in a range of 90° ≤ α ≤ 135°.
The electrochromic film according to any one of claims 1 to 8, wherein a blocking portion is provided corresponding to the corner electrode, and the blocking portion blocks or reduces a current of a busbar from the corner electrode to a central portion of the electrochromic film.
The electrochromic film according to claim 9, wherein the blocking portion comprises an etched region after etching a portion of the conductive layer and/or a filler with a resistance greater than that of the busbar.
The electrochromic film according to any one of claims 1 to 8, wherein for any point on the edge portion between two points separated by a first preset distance, the perpendicular distance from this point to the line segment connecting the two points is defined as a second preset distance; when the second preset distance is less than or equal to n times the first preset distance, where n ranges from 5% to 10%, the corresponding edge portion between the two points is considered as the straight-edge portion; or, any point on the corresponding edge portion between two points at a first preset distance divides the edge portion between the two points into a first segment and a second segment; a line tangent to the first segment through the point is a first tangent line; a line tangent to the second segment through the point is a second tangent line; when an angle between the first tangent line and the second tangent line is greater than or equal to 135°, the corresponding edge portion between the two points is considered as the straight-edge portion.
The electrochromic film according to claim 11, wherein a value of the first preset distance ranges from 30 mm to 300 mm.
The electrochromic film according to any one of claims 1 to 8, wherein for any point on the edge portion between two points separated by a first preset distance, the perpendicular distance from this point to the line segment connecting the two points is defined as a second preset distance; when the second preset distance is larger than n times the first preset distance, where n ranges from 5% to 10%, the corresponding edge portion between the two points is considered as the corner portion; or, the corner portion comprises a vertex and two ends with edges connected to each other; any point on the corresponding edge portion between two points at a first preset distance divides the edge portion between the two points into a first segment and a second segment; a line tangent to the first segment through the point is a first tangent line; a line tangent to the second segment through the point is a second tangent line; when an angle between the first tangent line and the second tangent line is less than 135°, the point is considered as the vertex of the corner portion.
The electrochromic film according to any one of claims 1 to 8, wherein when the electrochromic film is charged or discharged, a maximum electric field intensity in a corner region corresponding to the corner electrode is E 3max , and a minimum electric field intensity in the edge portion is E 4min ; wherein, E 3max < E 4min or a difference between E 3max and E 4min is within 10% of the E 4min to 30% of the E 4min .
A color-changing device, comprising a substrate layer and an electrochromic film according to any one of claims 1 to 14, wherein the substrate layer and the electrochromic film are stacked together.
A terminal product, comprising an electrochromic film according to any one of claims 1 to 14 or a color-changing device according to claim 15, wherein the terminal product comprises any one of a rearview mirror, a curtain wall, a vehicle sunroof , a vehicle side window, a vehicle windshield, a housing of an electronic product, an eyeglass, a vehicle, and a display panel.

Description

CROSS REFERENCE TO RELATED APPLICATIONS The present application claims priority to Chinese Patent Application No. 2023108129081, 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 electrochromic technology, 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 or fading under the action of an external voltage. Typically, busbars are provided on each of the two conductive substrate layers of an electrochromic film, and the electrochromic film is electrically connected to an external power source through the busbars, thereby forming a voltage difference across the two ends of the electrochromic material, causing the electrochromic material of the electrochromic film to change color in response to the change in the voltage difference. Currently, in the use of electrochromic films, the corner regions of the film are prone to premature failure, eventually causing the entire film to fail rapidly. SUMMARY In view of this, an objective of the present application is to overcome the shortcomings of the prior art and provides an electrochromic film, a color-changing device and a terminal product. The present application provides the following technical solution: an electrochromic film, which includes an edge portion; the edge portion includes a corner portion and a straight-edge portion, the corner portion is correspondingly provided with a corner electrode, the straight-edge portion is correspondingly provided with straight-edge electrodes, and the straight-edge electrodes are spaced apart from the corner electrode;the electrochromic film further includes at least one of following features:a length of the corner electrode is L1, an average length of the straight-edge electrodes is L2, and L2 < L1;the corner electrode includes a first side extending along a first direction and a second side extending along a second direction, an included angle α between the first side and the second side is in a range of 45° ≤ α ≤ 135°;a perimeter of the edge portion is D, the corner electrode is arc-shaped, and a radius of the corner electrode is N, wherein a value of N is in a range of 1/9 × D ≤ N. Optionally, the L1 and the L2 satisfy a condition that: L2 < L1 < 4 × L2. Optionally, a difference between L1 and L2 is greater than 20% of the L2. Optionally, a straight-line distance between two ends of the corner electrode is L, wherein the L and the L2 satisfy a condition that: L2 < L. Optionally, a first interval region is provided between the corner electrode and a straight-edge electrode adjacent to the corner electrode, a length of the first interval region is L3; a second interval region is provided between the adjacent straight-edge electrodes, a length of the second interval region is L4;in which, L4 ≤ L3. Optionally, the corner electrode protrudes towards the corner portion. 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 of the electrochromic film is provided with a first groove and a second groove; the electrochromic film is electrically connected to a busbar, the busbar includes a first busbar and a second busbar, the corner electrode includes a first corner electrode and a second corner electrode, and the straight-edge electrodes include a first straight-edge electrode and a second straight-edge electrode; 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 the first corner electrode and the first straight-edge electrode, and the first corner electrode and the first straight-edge electrode are 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 the second corner electrode and the second straight-edge electrode, and the second corner electrode and the second straight-edge electrode are electrically connected to the second busbar. Optionally, the value of α is in a range of 90° ≤ α ≤ 135°. Optionally, a blocking portion is provided corresponding to the corner electrode, and the blocking portion blocks or reduces a current of a busbar from the corner electrode to a central portion of the electrochromic film. Optionally, the blocking portion includes an etched region after etching a portion of the conductive lay