Flexible Display Panel Adhesive Structure for Non-Display Bend Cracks
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Solution Overview
Problem
The current non-display area bending process in flexible display panels results in local stress concentration, leading to cracking of wiring or circuits due to asynchronous movement of both sides during bending, which compromises the reliability of the display panel.
Innovation Solution
A flexible display panel design that incorporates a first adhesive layer connected to a second adhesive layer, with the first adhesive layer extending towards the display area and covering the bendable portion, enhancing the stiffness and protective effect on the non-display area, and a backplate on the non-light emitting side for additional support without affecting bending performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the non-display area length L1 is designed to be longer, then the bending flexibility is improved, but the wiring or circuits are easily cracked due to stress concentration
Solution Approach 1:
The patent applies different adhesive layers with different properties to different regions of the non-display area. The first adhesive layer is applied to the bendable portion requiring flexibility, while the second adhesive layer is applied to the stable region requiring structural support. This local differentiation allows the structure to bend flexibly where needed while maintaining wiring integrity in critical areas.
Solution Approach 2:
The patent uses a composite adhesive structure with two distinct adhesive layers. The first adhesive layer provides flexibility for bending, while the second adhesive layer provides structural stability. This composite approach combines the benefits of both material types to achieve both bending flexibility and wiring protection simultaneously.
2Length of moving object
If the non-display area length L1 is designed to be longer, then the bending range is increased, but both sides cannot move synchronously with middle area during bending
Solution Approach 1:
The patent differentiates the adhesive structure into two zones: the first adhesive layer in the bendable portion allows local deformation and asynchronous movement, while the second adhesive layer in the stable region maintains structural coherence. This local differentiation enables the long non-display area to bend without causing stress concentration or cracking.
Solution Approach 2:
The patent segments the adhesive structure into two functional layers: the first adhesive layer segmented to the bendable portion and the second adhesive layer to the stable region. This segmentation allows different parts of the structure to move independently during bending, preventing stress concentration while maintaining overall structural integrity.
3Strength
If adhesive layers are applied to improve stiffness, then protective effect on non-display area is improved, but bending performance may be affected
Solution Approach 1:
The patent applies adhesive layers with different stiffness properties to different regions: the first adhesive layer in the bendable portion has properties optimized for flexibility, while the second adhesive layer in the stable region has properties optimized for protection and stiffness. This local differentiation provides protective effect where needed without compromising bending performance.
Solution Approach 2:
The patent segments the adhesive protection into two functional layers: the first adhesive layer segmented to the bendable portion provides flexibility during bending, while the second adhesive layer segmented to the stable region provides structural protection. This segmentation achieves both protection and bending performance simultaneously.
Data Source
AI summary
A flexible display panel and a display device are provided. A first adhesive layer and a second adhesive layer are provided on a surface of a light-emitting side of the display panel. The first adhesive layer covers a bendable portion and extends toward a direction of the display area, and the second adhesive layer is located on a side of the first adhesive layer away from the display area and connected to the first adhesive layer. The flexible display panel and the display device proposed in the present application can relieve a problem of cracks on both sides of a non-display area and improve product reliability.