Flexible Display Panel Bending Protection for Wire Stress Relief
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Solution Overview
Problem
Display panels with flexible substrates face challenges in the bending region due to potential damage to wires and increased stress, which can lead to reduced durability and reliability.
Innovation Solution
A bending protection layer is integrated into the bending region of the display panel, composed of a portion of the flattening layer, which extends from the display area to the bending region, providing protection against impact and stress relief for wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small radius of curvature is used for the bending region, then the utilization of inner space is increased and the display device becomes more compact, but the wires disposed in the bending region are more likely to be damaged
Solution Approach 1:
A bending protection layer is formed over the bending region before the device is assembled and used. This protection layer acts as a cushion that absorbs and distributes the stress during bending, preventing direct damage to the wires underneath. The layer is specifically positioned in the bending region to provide targeted protection where stress concentration occurs.
Solution Approach 2:
The bending protection layer is formed using a composite structure that combines materials with different mechanical properties. The layer may include multiple sub-layers with varying flexibility, strength, and stress distribution characteristics, allowing it to effectively protect wires while accommodating the small radius of curvature bending requirement.
2Reliability
If a bending protection layer is formed in the bending region, then wire damage and stress are reduced, but the device complexity increases
Solution Approach 1:
The bending protection layer is merged with the existing encapsulation layer structure. Instead of being a completely separate component, the protection layer is integrated into the encapsulation system, sharing common formation processes and material deposition techniques. This reduces the overall device complexity while maintaining the protective function.
Solution Approach 2:
The bending protection layer serves multiple functions simultaneously: it protects wires from damage, distributes mechanical stress, provides environmental barrier protection, and maintains structural integrity during bending. By consolidating these functions into a single integrated layer, the device complexity is minimized while achieving comprehensive protection.
Data Source
AI summary
A display device includes a display panel having a display area and a bending region. The display panel includes a light emitting diode disposed in the display area. An encapsulation layer encapsulates the light emitting diode. A light-control pattern is disposed on the encapsulation layer. The light-control pattern includes a passivation layer and a flattening layer. The flattening layer extends from the display area to the bending region. A bending protection layer is disposed in the bending region. The bending protection layer is composed of a portion of the flattening layer in the bending region.