EP-4741917-A1 - ELECTROCHROMIC FILM, COLOR-CHANGING DEVICE, AND TERMINAL PRODUCT

EP4741917A1EP 4741917 A1EP4741917 A1EP 4741917A1EP-4741917-A1

Abstract

The present disclosure provides an electrochromic film, a color-changing device, and a terminal product, which pertains to the field of electrochromic technologies. The electrochromic film includes an edge portion; the edge portion includes: a corner portion corresponding to a corner area of the electrochromic film and a straight-edge portion corresponding to a non-corner area of the electrochromic film. The corner portion is provided with a corner electrode, and each straight-edge portion is provided with a straight-edge electrode; a first spacing region is formed between the corner electrode and an adjacent straight-edge electrode, and a second spacing region is formed between each pair of adjacent straight-edge electrodes; a length of the first spacing region is L 1 , and a length of the second spacing region is L 2 , wherein L 2 <L 1 . The length of the first spacing region is arranged to be greater than the length of the second spacing region. Accordingly, an electrochromic layer in the corner area changes color uniformly with other areas without overcharging or overdischarging, and premature corner failure of the electrochromic film is effectively avoided.

Inventors

CHEN, XINHUA
WANG, Weishu
LU, Yicai

Assignees

Guangyi Intelligent Tech (Suzhou) Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240614

Claims (18)

An electrochromic film, characterized by comprising an edge portion; wherein the edge portion comprises a corner portion corresponding to a corner area of the electrochromic film and a straight-edge portion corresponding to a non-corner area of the electrochromic film, the corner portion is provided with corner electrode(s), and the straight-edge portion is provided with straight-edge electrode(s); a first spacing region is formed between the corner electrode and a straight-edge electrode adjacent to the corner electrode, and a second spacing region is formed between each pair of adjacent straight-edge electrodes; a length of the first spacing region is denoted as L 1 , a length of the second spacing region is denoted as L 2 , wherein L 2 <L 1 .
The electrochromic film according to claim 1, characterized in that , a length of the corner electrode is L 3 , and a length of the straight-edge electrode is L 4 , wherein L 3 ≤L 4 , or L 1 <L 4 , or both.
The electrochromic film according to claim 1, characterized in that , a ratio of L 1 to L 2 is m, and a value range of m is 1≤m≤4.
The electrochromic film according to any one of claims 1 to 3, characterized in that , a polarity of the corner electrode is opposite to a polarity of the straight-edge electrode adjacent to the corner electrode.
The electrochromic film according to claim 1, characterized in that , a plurality of straight-edge electrodes are provided, and the second spacing region is formed between each pair of adjacent straight-edge electrodes; wherein on a same edge of the electrochromic film, lengths of these second spacing regions between pairs of adjacent straight-edge electrodes are identical; alternatively, a length of the second spacing region decreases from two ends of an edge towards a middle of the edge.
The electrochromic film according to claim 1, characterized in that , a value range of the length L 1 of the first spacing region is 5 mm<L 1 ≤200 mm, or a value range of the length L 2 of the second spacing region is 5 mm≤L 2 <200 mm, or both.
The electrochromic film according to claim 1, characterized in that , a sum of a total length of the first spacing region and a total length of the second spacing region is denoted as S 1 ; a sum of a total length of the straight-edge electrode(s) and a total length of the corner electrode(s) is denoted as S 2 ; wherein a ratio of S 1 to S 2 is n, and a value range of n is 1/11≤ n < 1.
The electrochromic film according to claim 1, characterized by comprising a first substrate layer, a first conductive layer, an electrochromic layer, a second conductive layer, and a second substrate layer which are laminated in sequence; wherein the corner portion is provided with a first groove and a second groove; wherein the corner electrode comprises a first corner electrode and a second corner 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 to form the first corner electrode; 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 to form the second corner electrode.
The electrochromic film according to claim 8, characterized in that , the straight-edge electrode comprises a first straight-edge electrode and a second straight-edge electrode, and the straight-edge portion is provided with a third groove and a fourth groove arranged in an alternate manner; wherein the third groove penetrates through the first substrate layer, the first conductive layer, and the electrochromic layer along the thickness direction of the electrochromic film, to expose a portion of the second conductive layer to form the first straight-edge electrode; the fourth 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 to form the second straight-edge electrode.
The electrochromic film according to claim 8, characterized in that , the straight-edge electrode comprises a first straight-edge electrode and a second straight-edge electrode, the electrochromic film further comprises busbars, wherein the busbars comprise a first busbar and a second busbar; the straight-edge portion is provided with a third groove and a fourth groove arranged in an alternate manner; the third groove penetrates through the first substrate layer, the first conductive layer, and the electrochromic layer along the thickness direction of the electrochromic film, to expose a portion of the second conductive layer to form the first straight-edge electrode; the fourth 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 to form the second straight-edge electrode; wherein the second busbar is electrically connected to the second straight-edge electrode and the second corner electrode, and the first busbar is electrically connected to the first straight-edge electrode and the first corner electrode.
The electrochromic film according to any one of claims 1 to 10, characterized in that , for two points on the edge portion that are separated by a first preset distance, the edge portion between these two points is a straight-edge portion if a following condition is satisfied: for any point on this edge portion, a vertical distance from this point to a line segment connecting the two points, which is defined as a second preset distance, is less than or equal to n times the first preset distance, wherein n is in a range of 5% to 10%; alternatively, for two points on the edge portion separated by a first preset distance, the edge portion between the two points is a straight-edge portion if a condition is satisfied, the condition is determined by taking any point on this edge portion, which divides the edge portion into a first segment and a second segment, a first tangent line to the first segment at this point and a second tangent line to the second segment at this point are defined, the condition is satisfied if an included angle between the first tangent line and the second tangent line is greater than or equal to 135°.
The electrochromic film according to any one of claims 1 to 10, characterized in that , for two points on the edge portion that are separated by a first preset distance, the edge portion between these two points is a corner portion if a following condition is satisfied: for any point on this edge portion, a vertical distance from this point to a line segment connecting the two points, which is defined as a second preset distance, is greater than n times the first preset distance, wherein n is in a range of 5% to 10%; alternatively, the corner portion comprises a vertex and an end portion connecting two straight-edge portions, for two points on the edge portion separated by a first preset distance, any point on the edge portion, which divides the edge portion into a first segment and a second segment, is determined as the vertex of the corner portion if an included angle between a first tangent line to the first segment at this point and a second tangent line to the second segment at this point is less than 135°.
The electrochromic film according to claim 11, characterized in that , 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 10, characterized in that , the corner area is defined as an area formed between end portions connecting adjacent straight-edge portions, and an included angle between the two straight-edge portions is less than 135°; alternatively, for two points on the edge portion that are separated by a first preset distance, an area formed by the edge portion between these two points is the corner area if a following condition is satisfied: for any point on this edge portion, a vertical distance from this point to a line segment connecting the two points, which is defined as a second preset distance, is greater than n times the first preset distance, wherein n is in a range of 5% to 10%.
The electrochromic film according to claim 10, characterized in that , a barrier portion is correspondingly arranged at the corner electrode, and the barrier portion is configured to block or restrict a current conducted by the corner electrode from flowing from the barrier portion to a central portion.
The electrochromic film according to claim 15, characterized in that , the barrier part comprises an etching area formed by etching a portion of the conductive layer or a filler having a resistance greater than that of the busbar, or both.
A color-changing device, characterized by comprising at least one substrate layer and the electrochromic film according to any one of claims 1 to 16, wherein the substrate layer and the electrochromic film are laminated together.
A terminal product, characterized by comprising the electrochromic film according to any one of claims 1-16 or the color-changing device according to claim 17, wherein the terminal product comprises any one of a rearview mirror, a curtain wall, an automobile sunroof, an automobile side window, an automobile windshield, a housing of an electronic product, eyeglasses, a vehicle, and a display panel.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present disclosure claims priority to Chinese patent application No. 2023217378267, filed with CNIPA on July 4, 2023, and entitled "electrochromic film, color-changing device and terminal product", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to the field of electrochromic technologies, and more particularly, to an electrochromic film, a color-changing device and a terminal product. BACKGROUND Electrochromism is a technology that enables an electrochromic material to undergo reversible and stable coloring or fading phenomena under the action of an external voltage. Generally, by arranging busbars on a conductive layer of an electrochromic film, the electrochromic film is electrically connected to an external power supply through the busbars. Consequently, a voltage across the two ends of the electrochromic film is generated, and the electrochromic material of the film changes color in response to a change in the voltage across the two ends of the electrochromic film. Currently, during the use of the electrochromic film, failure of a corresponding corner area of the film is prone to occur. Accordingly, the final color change endpoint fails to reach a preset transmittance, which leads to premature failure and ultimately causes rapid failure of the entire film. SUMMARY In view of this, the present disclosure aims to overcome the deficiencies existing in the related art by providing an electrochromic film, a color-changing device and a terminal product. The present disclosure provides the following technical solutions: an electrochromic film which includes an edge portion; the edge portion includes a corner portion corresponding to a corner area of the electrochromic film and a straight-edge portion corresponding to a non-corner area of the electrochromic film, the corner portion is provided with a corner electrode, and the straight-edge portion is provided with a straight-edge electrode; a first spacing region is formed between a corner electrode and a straight-edge electrode adjacent to the corner electrode, and a second spacing region is formed between each pair of adjacent straight-edge electrodes; a length of the first spacing region is denoted as L1, a length of the second spacing region is denoted as L2, wherein L2 <L1. Optionally, a length of the corner electrode is L3, and a length of the straight-edge electrode is L4, L3≤L4, or L1<L4, or both. Optionally, a ratio of L1 to L2 is m, and a value range of m is 1≤m≤4. Optionally, a polarity of the corner electrode is opposite to a polarity of a straight-edge electrode adjacent to the corner electrode. Optionally, a plurality of straight-edge electrodes are provided, and the second spacing region is formed between each pair of adjacent straight-edge electrodes; On a same edge of the electrochromic film, lengths of these second spacing regions between pairs of adjacent straight-edge electrodes are identical; alternatively, a length of the second spacing region decreases from two ends of an edge towards a middle of the edge. Optionally, a value range of the length L1 of the first spacing region is 5 mm<L1≤ 200 mm, or a value range of the length L2 of the second spacing region is 5 mm≤L2<200 mm, or both. Optionally, a sum of a total length of the plurality of first spacing regions and a total length of the plurality of second spacing regions is denoted as S1; a sum of a total length of the straight-edge electrode and a total length of the corner electrode is denoted as S2;a ratio of S1 to S2 is n, and a value range of n is 1/11≤n<1. Optionally, the electrochromic film further includes a first substrate layer, a first conductive layer, an electrochromic layer, a second conductive layer, and a second substrate layer which are laminated in sequence; the corner portion is provided with a first groove and a second groove; the corner electrode includes a first corner electrode and a second corner 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 to form the first corner electrode;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 to form the second corner electrode. Furthermore, the straight-edge electrode includes a first straight-edge electrode and a second straight-edge electrode, and the straight-edge portion is provided with a third groove and a fourth groove arranged in an alternate manner; the third groove penetrates through the first substrate layer, the first conductive layer, and the electrochromic layer along the thickness direction of the electrochromic film, to expose a portion of t