Multilayer Adhesive Assembly for Flexible Display Back Plate Attachment
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Solution Overview
Problem
The manufacturing process of flexible display apparatuses is hindered by the high cost and time required to attach back plates, which is exacerbated by the use of optically clear adhesives with high adhesive force, making it difficult to detach and increasing costs as the number of units increases.
Innovation Solution
A display apparatus with a multilayer adhesion assembly featuring adhesive layers with different storage moduli, where a first adhesive layer with a low storage modulus is used for the back plate and a second adhesive layer with a higher storage modulus is applied directly to the display panel, allowing for easier detachment and reduced manufacturing time and cost by enabling simultaneous attachment of back plates across multiple units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single optically clear adhesive layer with high adhesive force is used to attach the back plate to the display panel, then the attachment strength is improved, but the detachment difficulty increases and manufacturing cost increases
Solution Approach 1:
The single adhesive layer is segmented into multiple adhesive layers with different storage moduli. The first adhesive layer (lower storage modulus) provides initial attachment and allows easy detachment, while the second adhesive layer (higher storage modulus) provides strong attachment when needed. This segmentation resolves the contradiction by having different adhesive layers serve different functions.
Solution Approach 2:
Different regions of the adhesive assembly have different storage moduli. The first adhesive layer has lower storage modulus for easy detachment in bending areas, while the second adhesive layer has higher storage modulus for strong attachment in non-bending areas. This local differentiation resolves the contradiction between easy detachment and strong attachment.
2Reliability
If the back plate is attached to every unit cell formed on the mother substrate, then the attachment completeness is improved, but the manufacturing time and cost increase
Solution Approach 1:
Multiple unit cells are merged into a single mother substrate, and the back plate is attached to the entire mother substrate as one piece rather than individually to each unit cell. This merging approach maintains attachment completeness for all unit cells while significantly reducing manufacturing time and cost.
Solution Approach 2:
The back plate is attached to the mother substrate before the unit cells are separated. This preliminary action allows the back plate to be pre-positioned and secured to the entire substrate, and then the unit cells can be easily separated without requiring individual attachment operations for each unit cell.
3Adaptability or versatility
If the back plate is not attached to the bending area to enable flexible display, then the flexibility is improved, but the structural support decreases
Solution Approach 1:
The back plate is segmented into a first back plate (attached to the display panel) and a second back plate (not attached to the bending area). This segmentation allows the display panel to remain flexible in the bending area while providing structural support where needed, resolving the contradiction between flexibility and structural support.
Solution Approach 2:
The back plate is extracted from the bending area, meaning it is not attached to the flexible portion of the display panel. This extraction maintains the flexibility needed for flexible display while the back plate can still provide structural support to the non-bending areas through the first back plate attachment.
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 approach simplifies the attachment process, reduces manufacturing costs, and allows for a narrower bezel area by enabling the removal of back plate areas in bulk, thereby improving the efficiency and cost-effectiveness of producing flexible display devices.
Implementation Method 1
a back plate may be attached to a lower surface of the display panel, that is, a lower surface of the flexible substrate by an optically clear adhesive
Data Source
AI summary
There is disclosed a display apparatus including a display panel comprising a display area having a plurality of sub-pixels and a non-display area surrounding the display area and having a bending area; a first back plate and a second back plate disposed under the display panel and spaced apart from each other; and an adhesion assembly attaching the first back plate and the second back plate to a lower surface of the display panel. The adhesion assembly may have a multilayer structure in which a plurality of adhesive layers with different storage moduli are disposed.