Flexible Display Crease Reduction via Localized Adhesive and Thickness Variation
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Solution Overview
Problem
Current flexible display technologies face challenges in minimizing creases and production costs due to misalignment deviations between bending auxiliary layers and support plates, leading to abnormal displays and increased film separation under bending stress.
Innovation Solution
A display device design featuring a flexible display panel with a bending auxiliary layer and a support plate, where the sum of their thicknesses differs between regions, with an adhesive layer only in the first region, and recessed-portions on the support plate to accurately align the adhesive layer, reducing creases and film separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bending auxiliary layer and support plate are used to support the flexible display panel, then the panel stability and anti-crease performance are improved, but the device complexity and production difficulty increase due to alignment requirements
Solution Approach 1:
The support plate is designed with different thicknesses in different regions: a first thickness in the first region and a second thickness in the second region. This local quality variation allows the adhesive layer to be positioned precisely in the first region while maintaining panel stability, reducing alignment complexity without compromising reliability
Solution Approach 2:
The adhesive layer is pre-positioned in the first region where the bending auxiliary layer and support plate overlap, before the actual bending operation. This preliminary positioning ensures proper alignment and reduces the complexity of real-time alignment during assembly
2Strength
If the adhesive layer is applied across the entire overlap region, then the bonding strength is improved, but the bending flexibility and crease reduction are worsened due to excessive adhesive in the second region
Solution Approach 1:
The adhesive layer is applied only in the first region where it is needed for bonding, while the second region remains adhesive-free to maintain bending flexibility. This localized application strategy ensures sufficient bonding strength where required while preserving flexibility where needed
Solution Approach 2:
The overlap region is segmented into a first region and a second region with different functional requirements. The adhesive layer is selectively applied only to the first region, creating a segmented bonding strategy that balances strength and flexibility requirements of different areas
3Ease of manufacture
If the bending auxiliary layer and support plate have uniform thickness, then the manufacturing process is simplified, but the alignment precision and adhesive positioning accuracy are reduced
Solution Approach 1:
The support plate features local thickness variation with a first thickness in the first region and a second thickness in the second region. This local quality differentiation provides natural positioning features that improve alignment precision during assembly while maintaining relative manufacturing simplicity through a single component design
Solution Approach 2:
The thickness parameter of the support plate is changed across different regions to create distinct zones. This parameter variation (thickness) serves as a positioning mechanism that improves alignment precision without requiring complex multi-component assemblies
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 design effectively reduces creases and film separation, improves adhesive reliability, and saves production costs by ensuring accurate bending and support of the flexible display panel without additional support structures.
Implementation Method 1
an adhesive layer, between the bending auxiliary layer and the support plate, configured to fix the bending auxiliary layer to the support plate
Data Source
AI summary
A display device and its formation method are provided in the present disclosure. The display device includes a flexible display panel; a bending auxiliary layer fixed on a first surface of the flexible display panel; a support plate at a side of the bending auxiliary layer away from the flexible display panel; and an adhesive layer, between the bending auxiliary layer and the support plate, configured to fix the bending auxiliary layer to the support plate. A region where the bending auxiliary layer overlaps the support plate includes a first region and a second region. A sum of thicknesses of the bending auxiliary layer and the support plate in the first region is less than a sum of thicknesses of the bending auxiliary layer and the support plate in the second region. The adhesive layer is in the first region and not in the second region.