Back-Film Structure for Flexible Display Rolling Reliability
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Solution Overview
Problem
Flexible display panels experience a segment difference between the head end and tail end when rolled, leading to reduced reliability and lifespan due to uneven thickness, which existing technologies have not effectively addressed.
Innovation Solution
A back-film structure with a first portion that gradually increases in thickness in the rolling direction, forming an arc surface to eliminate the segment difference and ensure flatness, while the second portion maintains a constant thickness to simplify processing and enhance rolling reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform thickness back-film structure is used, then the manufacturing process is simple, but segment difference occurs during rolling reducing reliability
Solution Approach 1:
The back-film structure is divided into multiple portions (first back-film portion and second back-film portion) with different thickness characteristics. The first portion has gradually decreasing thickness to eliminate segment difference during rolling, while the second portion maintains uniform thickness for structural stability. This segmentation resolves the contradiction by allowing different regions to serve different functional purposes.
Solution Approach 2:
Different portions of the back-film structure are given different thickness properties according to their specific functional requirements. The first back-film portion near the rolling start has gradually decreasing thickness to address segment difference, while the second portion has uniform thickness for maintaining overall structural integrity. This local differentiation resolves the contradiction between reliability and complexity.
2Reliability
If the back-film thickness is increased to prevent dislocation, then rolling reliability improves, but the segment difference problem worsens
Solution Approach 1:
The first back-film portion is designed with a curved thickness profile (gradually decreasing from one end to the other) rather than a straight uniform thickness. This curvature in the thickness distribution matches the arc shape formed during rolling, eliminating segment difference while maintaining sufficient overall thickness for preventing dislocation.
3Shape
If a gradual thickness change is implemented, then segment difference is eliminated, but manufacturing precision requirements increase
Solution Approach 1:
The gradual thickness change is implemented in segments rather than continuously across the entire back-film. The first portion contains the gradual thickness transition zone, while the second portion maintains uniform thickness. This segmentation makes the manufacturing process more controllable and reduces overall precision requirements compared to implementing gradual change across the entire structure.
Data Source
AI summary
A back-film structure may include a first back-film portion which serves as a first circle upon rolling and a second back-film portion arranged side by side with the first back-film portion in the rolling direction, wherein a thickness of the first back-film portion increases in the rolling direction. This solution can ensure that the inner surface of the tail end of the first back-film portion is located as close as possible to the inner surface of the head end of the first back-film portion after the rolling.