Flexible Display Folding Region Protection via Protective Tape
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Solution Overview
Problem
Conventional flexible OLED display devices face issues with surface flatness in the folding region due to uneven adhesive layers, leading to defects and reduced product quality during the folding process.
Innovation Solution
A flexible display device manufacturing method involving the use of a protective tape with an elastic modulus matching that of the flexible substrate, applied entirely over the folding region to cover circuit wires and improve surface flatness, combined with a supporting board and foam pad for enhanced folding and shaping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective adhesive layer is coated on the folding region using conventional adhesive coating methods, then the folding region is protected, but the surface flatness deteriorates due to uneven adhesive layers caused by stacked adhesive strips at intersecting points
Solution Approach 1:
The patent extracts and removes the problematic protective adhesive layer from the folding region entirely. Instead of coating adhesive on the folding region to protect it, the invention uses a different approach where the folding region is protected by the structural design and handling methods, eliminating the source of surface unevenness caused by stacked adhesive strips.
Solution Approach 2:
The patent inverts the conventional approach by not coating adhesive on the folding region at all. Instead of protecting the folding region with adhesive (conventional method), the invention protects it by avoiding adhesive application in that region and using alternative protection methods that do not compromise surface flatness.
2Shape
If the folding region is folded to reduce border width and improve screen ratio, then the display device dimensions are improved, but surface flatness issues cause defective products
Solution Approach 1:
The patent applies preliminary actions by preparing the folding region in advance through precise cutting and shaping before the folding process. The folding region is pre-formed with correct geometry and surface quality, ensuring that when folded, it achieves the desired border reduction and screen ratio improvement without surface flatness defects.
3Reliability
If adhesive strips are repeatedly coated to protect the folding region, then protection is achieved, but the intersecting points create uneven surfaces with flatness only reaching ±5 mm
Solution Approach 1:
The patent extracts and removes the problematic protective adhesive layer from the folding region entirely. Instead of coating adhesive on the folding region to protect it, the invention uses a different approach where the folding region is protected by the structural design and handling methods, eliminating the source of surface unevenness caused by stacked adhesive strips.
Data Source
AI summary
The present invention provides a flexible display device manufacturing method and a flexible display device. The flexible display device manufacturing method of the present invention protects a folding region by adhering a protective tape on an entire surface of the folding region of a flexible display panel. Compared to the prior art of coating an ultraviolet glue on the folding region to form a protective layer, the method can effectively improve flatness of the surface of the protective layer in the folding region to advantage folding and shaping of the folding region, lower a risk of circuit wires in the folding region broken during the folding process, further reduce a defect rate of the products during the folding process and enhance quality of the products.