Flexible Display Assembly with Layered Covers for Curl Stress Control
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Solution Overview
Problem
The increasing curl stress in OLED flexible display assemblies due to their curving, folding, and curling configurations leads to functional failures, as existing technologies struggle to manage and distribute stress effectively.
Innovation Solution
A flexible display assembly is designed with a support member, a flexible display panel, a cover layer group, and a bonding portion. The cover layer group, flexible display panel, and support member form a structure with two protruding sides and a depressed middle, where the bonding portion is bonded between the support member and the cover layer group, effectively transferring stress and preventing peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the OLED flexible display assembly is configured for curving, folding, and curling to increase curl radius and freedom, then the display flexibility and configurability are improved, but the curl stress increases leading to functional failure
Solution Approach 1:
The cover layer group is divided into multiple layers including a first cover layer, a second cover layer, and a third cover layer with different widths. This segmentation allows each layer to independently manage stress in different regions, with the protruding portions distributing tension and pressure to reduce overall curl stress while maintaining display flexibility.
Solution Approach 2:
Different regions of the cover layer group have different widths to provide localized stress management. The first cover layer has a greater width than the flexible display panel to form protruding portions at both ends, while the second and third cover layers have widths matching the flexible display panel. This local variation in width allows specific regions to bear and distribute stress differently, reducing curl stress concentration.
2Device complexity
If the cover layer group and support member are bonded directly to the flexible display panel edges, then the structure is simplified, but stress concentration causes peeling and functional failure
Solution Approach 1:
The bonding structure extends beyond the two-dimensional plane of the flexible display panel by creating protruding portions at both ends of the cover layer group. These protruding portions bond to the support member in a three-dimensional configuration, distributing bonding stress across a larger area and preventing peeling that would occur with direct edge-to-edge bonding.
Solution Approach 2:
The bonding adhesive layer acts as an intermediary between the cover layer group protruding portions and the support member. This intermediate bonding layer distributes stress uniformly across the bonding interface, preventing stress concentration and peeling that would occur with direct rigid bonding, while maintaining structural integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces curl stress and prevents functional failures by distributing tension and pressure across the bonding portion, maintaining the curving state and ensuring the flexible display panel remains intact.
Implementation Method 1
the bonding portion is bonded between the support member and the cover layer group, effectively transferring stress and preventing peeling
Implementation Method 2
a bonding portion bonded between the first end of the support member and the first end of the cover layer group
Data Source
AI summary
A flexible display assembly, a flexible display device and a method for preparing the flexible display device are provided. The flexible display assembly includes a flexible display panel on a side of a support member, a width of the flexible display panel being less than a width of the support member; a cover layer group on a side, away from the support member, of the flexible display panel, the width of the flexible display panel being less than a width of the cover layer group, the cover layer group, the flexible display panel and the first end of the support member forming a structure with two protruding sides and a depressed middle; and a bonding portion bonded between the first end of the support member and the first end of the cover layer group.