Flexible Touch Panel Bridge Angles for Foldable Display Integrity
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Solution Overview
Problem
Existing display devices with flexible regions suffer from defects such as damage, creases, and buckling when folded due to the design of bridges and signal transmission lines that are aligned at specific angles, leading to interference with light emission and structural integrity issues.
Innovation Solution
A flexible touch sensing panel with bridges and signal transmission lines designed at angles that avoid odd multiples of 90 degrees and even multiples of 180 degrees, integrated with flexible insulating layers to minimize damage and creasing, and positioned to avoid overlapping emitting areas, using metal materials for flexibility and reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If bridges and signal transmission lines are aligned at specific angles (odd multiples of 90 degrees or even multiples of 180 degrees), then manufacturing and assembly are simplified, but damage, creases, and buckling occur when the device is folded
Solution Approach 1:
The patent changes the angular parameter of bridges and signal transmission lines from standard alignments (0°, 90°, 180°) to non-standard angles (e.g., 10°, 80°, 100°, 170°). This parameter modification prevents the lines from being aligned with the folding direction, thereby reducing damage, creases, and buckling while maintaining manufacturability.
2Reliability
If bridges are positioned to connect adjacent touch sensing electrodes, then electrical connectivity is maintained, but interference with light emission occurs
Solution Approach 1:
The patent applies local quality by carefully positioning bridges and signal transmission lines in specific regions where they least interfere with light emission. Bridges are routed through non-emitting areas or at angles that minimize overlap with emitting portions, while maintaining necessary electrical connectivity between adjacent touch sensing electrodes.
Solution Approach 2:
The patent uses asymmetric positioning of bridges and signal transmission lines, avoiding symmetric alignments that would maximize interference. By using non-standard angles and offset positions, the design creates asymmetric routing that reduces interference with light emission while preserving electrical functionality.
3Adaptability or versatility
If the flexible touch sensing panel is folded multiple times, then compact storage is achieved, but creases and buckling increase
Solution Approach 1:
The patent incorporates curved or rounded transitions in the routing of bridges and signal transmission lines, particularly in regions that will be folded. This curvature design allows the panel to bend more smoothly during folding, distributing stress more evenly and reducing sharp creases and buckling that would compromise structural integrity.
Data Source
AI summary
A device with a flexible region that is manipulable in a second standard direction substantially perpendicular to a rotational axis extending in a first standard direction includes a flexible touch sensing panel. The flexible touch sensing panel includes first touch sensing electrodes and a first bridge. The first bridge is on a layer substantially different from a layer on which the first touch sensing electrodes are located and the first bridge connects two first touch sensing electrodes adjacent to each other. The first bridge includes a first portion extending in a first extension direction, which forms a first angle with the first standard direction. The first angle is not about k×90° (where “k” is a non-zero positive or negative odd integer) and is not about m×180° (where “m” is an integer).