Flexible Display Window Layer Segmentation for Stress Dispersion
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Solution Overview
Problem
Flexible displays with stacked layers experience uneven stress distribution when bent, leading to premature wear and damage due to differences in elastic coefficients and material properties, which existing technologies fail to adequately address.
Innovation Solution
A flexible display design featuring a window layer with distinct bent and non-bending areas, where the bent area is formed by cutting, protrusions, or grooves, and a hard coating layer, allowing stress dispersion and maintaining optical characteristics when bent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible displays use a stacked multi-layer structure, then the display can achieve flexible form factors and new device applications, but stress is not evenly distributed when bent due to differences in elastic coefficients and material properties, leading to premature wear and damage
Solution Approach 1:
The window layer is divided into multiple cut units with cut lines formed between adjacent units. When the flexible display is bent, these cut units can move relative to each other along the cut lines, segmenting the stress distribution and preventing stress concentration that would occur in a continuous rigid window layer structure.
Solution Approach 2:
The window layer is designed with different structural properties in different regions: the bent area contains cut units that can move relative to each other to accommodate bending stress, while the non-bent area maintains structural integrity for optimal display performance. This local differentiation allows each region to have the quality needed for its specific function.
2Ease of manufacture
If the window layer is made continuous and rigid for structural integrity, then manufacturing is simplified, but the display cannot be bent without causing stress concentration and damage
Solution Approach 1:
The window layer is segmented into multiple cut units through cutting processes that create cut lines between adjacent units. This segmentation maintains manufacturing simplicity while enabling bending capability, as the cut units can move relative to each other during bending without requiring complex manufacturing steps.
Solution Approach 2:
The window layer transitions from a static continuous structure to a dynamic segmented structure where cut units can move relative to each other during bending. This dynamic behavior allows the window layer to adapt to bending deformations while maintaining structural integrity during normal operation.
3Device complexity
If stress is concentrated in one area during bending, then the structure is simpler, but premature wear and damage occur
Solution Approach 1:
The window layer is divided into multiple cut units that can move independently during bending. This segmentation distributes stress across multiple interfaces rather than concentrating it in one area, reducing wear and damage while adding minimal structural complexity.
Solution Approach 2:
The cut lines act as intermediary zones between adjacent cut units, allowing relative movement and stress redistribution. These intermediary regions prevent stress concentration by providing pathways for stress dissipation, thereby extending display lifespan without significant structural complexity.
Data Source
AI summary
A flexible display is disclosed. In one aspect, the flexible display includes a window layer including a bending area and a non-bending area and a flexible display panel formed over a surface of the window layer and configured to display images. The bending area includes a plurality of cut portions which are configured to be at least partially separated along a plurality of cut lines formed therebetween.