Flexible Display Buffer-Layer Layout for Crack-Free Narrow Bezels
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Solution Overview
Problem
Conventional flexible display devices suffer from cracks in the source electrode due to non-optimal placement on the neutral plane during bending, and are limited in high-resolution applications due to line distance and width restrictions, with bezel minimization techniques leading to design constraints.
Innovation Solution
The flexible display device incorporates a substrate with a first and second buffer layer structure, featuring a bending connection line between the layers to maintain a neutral plane, reducing stress concentration and preventing cracks, while allowing for high-resolution designs with minimized bezels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the source electrode is placed in the bending area to minimize bezel width, then the bezel area is reduced, but cracks occur in the source electrode due to stress concentration
Solution Approach 1:
A buffer layer is introduced as an intermediary element between the source electrode and the bending area. This buffer layer absorbs and distributes the stress generated during bending, preventing direct stress concentration on the source electrode while allowing the electrode to extend into the bending area for bezel minimization.
Solution Approach 2:
The buffer layer is implemented as a thin film structure that provides flexibility and stress management. This thin film allows the display device to bend while protecting the source electrode from cracking, enabling the electrode to be positioned in the bending area without compromising reliability.
2Area of stationary object
If conventional bezel bending techniques are used to minimize bezel width, then the bezel area is reduced, but design constraints are imposed due to line distance and width restrictions
Solution Approach 1:
The invention changes the critical parameter of stress distribution by introducing the buffer layer. This parameter change allows line designs with smaller distances and widths that would otherwise be constrained by bending stress, thereby enabling high-resolution displays with greater design flexibility.
3Ease of manufacture
If the source electrode is positioned away from the neutral plane to simplify manufacturing, then manufacturing is easier, but stress concentration causes cracks during bending
Solution Approach 1:
The buffer layer serves as a mediator that decouples the positioning requirements from the stress management requirements. The source electrode can be positioned at manufacturing-friendly locations while the buffer layer ensures stress is properly managed during bending, maintaining reliability.
Data Source
AI summary
A flexible display device of which esthetic appearance is improved by reducing a bezel is disclosed. The flexible display device comprises a substrate including a display area and a non-display area including a bending area; a link line in the non-display area on the substrate; and a bending connection line in the bending area pf the substrate and connected with the link line, and the bending connection line located between a first buffer layer and a second buffer layer of the flexible display device.