Rollable Display Panel Strain Management
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Solution Overview
Problem
Rollable display panels face peeling issues between layers due to strain accumulation during rolling, as existing structures are not adequately designed to manage stress distribution.
Innovation Solution
A rollable display panel design with varying adhesive layer thickness and elastic modulus in different areas, along with specific layer configurations such as ultra-thin glass and polymer thin films, to absorb and distribute strain effectively, preventing peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rollable display panel is designed with uniform adhesive layer thickness, then the manufacturing process is simple, but strain accumulation causes layer peeling in the strain accumulation area
Solution Approach 1:
The adhesive layer is designed with different thicknesses in different areas: a first thickness in the rollable area and a second thickness (greater than the first) in the strain accumulation area. This local differentiation allows the adhesive layer to provide enhanced bonding strength where strain accumulation occurs, preventing peeling while maintaining manufacturing feasibility through a controlled gradient structure.
2Reliability
If the adhesive layer thickness is increased in the strain accumulation area, then layer peeling is prevented, but the manufacturing precision requirement increases
Solution Approach 1:
The adhesive layer thickness parameter is changed spatially across different regions of the display panel. By transitioning from a uniform thickness to a variable thickness profile (thinner in rollable area, thicker in strain accumulation area), the design optimizes bonding reliability in high-stress regions while the gradual transition minimizes manufacturing precision challenges compared to abrupt changes.
3Reliability
If the elastic modulus is reduced in the strain accumulation area, then strain distribution is improved, but the structural strength decreases
Solution Approach 1:
The cover plate is designed with different elastic moduli in different areas: a first elastic modulus in the rollable area and a second elastic modulus (smaller than the first) in the strain accumulation area. This local modification allows the strain accumulation area to better distribute and absorb mechanical strain, reducing stress concentrations and improving overall reliability without significantly compromising the structural strength of the rollable area.
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
The solution effectively reduces strain accumulation and peeling by increasing adhesive layer thickness and modifying elastic modulus in strain accumulation areas, enhancing the durability and reliability of rollable display panels.
Implementation Method 1
a large strain accumulation will occur in the strain accumulation area
Implementation Method 2
an elastic modulus of a part of at least one of the first structure layer and the second structure layer in the strain accumulation area is smaller than an elastic modulus of a part of at least one of the first structure layer and the second structure layer in the rollable area or the flat area
Implementation Method 3
a side of the first ultra-thin glass layer facing the first polymer thin film has a rolling edge which is used for rolling and has a chamfer
Implementation Method 4
the first polymer thin film is arranged on a side of the first ultra-thin glass layer away from the flexible array substrate; the first hardening layer is arranged on a side of the first polymer thin film away from the flexible array substrate
Data Source
AI summary
The present disclosure relates to a rollable display panel. The rollable display panel includes a first structure layer, a second structure layer, and a first adhesive layer stacked between the first structure layer and the second structure layer. The rollable display panel is divided into a rollable area, a strain accumulation area, and a flat area distributed in sequence along a rolling direction. A thickness of a part of the first adhesive layer located in the strain accumulation area is greater than a thickness of a part of the first adhesive layer located in the rollable area or the flat area.