Foldable Display Adhesive Coating for Flat, Area-Specific Layers
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Solution Overview
Problem
Existing display apparatus manufacturing methods result in non-flat adhesive layers formed using different types of adhesive compositions, leading to potential defects during the manufacturing process.
Innovation Solution
A method involving the simultaneous coating of two adhesive compositions with specific monomer content differences and dynamic surface tension variations is used to form a preliminary adhesive layer, which is then cured using UV rays, resulting in distinct adhesive layers for non-folded and foldable areas, enhancing impact resistance and folding characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different types of adhesive compositions are used to form the adhesive layer in different areas, then impact resistance in non-folded areas and folding characteristics in foldable areas are improved, but the adhesive layer becomes non-flat causing manufacturing defects
Solution Approach 1:
The patent applies local quality by using different adhesive compositions with specific properties for different areas: the first adhesive composition is used for non-folded areas to provide impact resistance, while the second adhesive composition is used for foldable areas to provide folding characteristics. This spatial differentiation of material properties resolves the contradiction between achieving area-specific performance and maintaining overall layer flatness.
Solution Approach 2:
The patent employs parameter changes by carefully controlling the dynamic surface tension of the two adhesive compositions to differ by 0.1-1.0 mN/m, and controlling their coating speeds to maintain a specific ratio. These parameter adjustments ensure that despite using different adhesive types, the adhesive layer remains flat during the coating process, thereby resolving the contradiction between localized performance optimization and manufacturing precision.
2Ease of manufacture
If different adhesive compositions are coated at different times, then each adhesive can be applied optimally, but the coating process becomes complex and defects may occur at boundaries
Solution Approach 1:
The patent merges the coating operations of two different adhesive compositions into a single simultaneous coating process. By coordinating the coating speeds and maintaining a specific speed ratio between the first and second adhesive compositions, the patent achieves uniform adhesive layer formation without boundary defects, thus resolving the contradiction between ease of manufacture and manufacturing precision.
Solution Approach 2:
The patent uses dynamic surface tension as an intermediary parameter to control the interaction between the two different adhesive compositions during simultaneous coating. By maintaining the dynamic surface tension difference within 0.1-1.0 mN/m, the patent ensures proper spreading and boundary formation without defects, enabling both adhesives to be applied optimally while maintaining layer uniformity.
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 method reduces manufacturing defects by ensuring uniform adhesive layer formation, improving impact resistance in non-folded areas and folding characteristics in foldable areas, thereby enhancing the overall durability and reliability of the display apparatus.
Implementation Method 1
forming a lower adhesive layer by irradiating an ultraviolet ray to the preliminary lower adhesive layer
Data Source
AI summary
A method of manufacturing a display apparatus includes preparing a display panel with a functional layer attached to a surface of the display panel. The display panel includes a first non-folded area, a second non-folded area, and a foldable area between the first non-folded area and the second non-folded area, and forming a preliminary lower adhesive layer on the functional layer. The forming the preliminary lower adhesive layer includes coating a first adhesive composition on a portion of the functional layer that overlaps the first non-folded area and the second non-folded area and coating a second adhesive composition on another portion of the functional layer that overlaps the foldable area. During the forming the preliminary lower adhesive layer, the coating the first adhesive composition and the coating the second adhesive composition are simultaneously performed.