Flexible Display Adhesive Layer Modulation for Mounting Rigidity
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Solution Overview
Problem
Conventional flexible display apparatuses face challenges in maintaining flexibility while ensuring the reliability and mounting rate of components, particularly in regions requiring rigidity, due to the use of adhesive films that compromise flexibility in areas where it is not necessary.
Innovation Solution
A flexible display apparatus with a display panel having a flexible area and a non-flexible area, where a first adhesive layer with a low storage modulus (1 MPa or less) is used between the flexible area and a protective film, and a second adhesive layer with a higher storage modulus (10 MPa or more) is used between the non-flexible area and the protective film, allowing for enhanced flexibility in the display area and rigidity in the pad unit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a protective film is attached to a flexible display apparatus by using an adhesive excellent in flexibility, then flexibility of the entire flexible display apparatus is improved, but a mounting rate of a chip on film (COF) is lowered in a region such as a pad unit where flexibility is not required
Solution Approach 1:
The patent applies local quality by using a first adhesive layer with high flexibility in the flexible area and a second adhesive layer with high rigidity in the non-flexible area (pad unit). This allows each region to have the specific adhesive property needed for its function, resolving the contradiction between overall flexibility and local mounting reliability.
Solution Approach 2:
The adhesive layer is segmented into two distinct regions: a first adhesive layer for the flexible area and a second adhesive layer for the non-flexible pad unit area. This segmentation enables independent optimization of adhesive properties in each region, allowing flexibility where needed and rigidity where mounting reliability is critical.
2Ease of operation
If a single adhesive layer with high flexibility is used throughout the display panel, then flexibility is maintained, but rigidity is insufficient in the pad unit area for stable component mounting
Solution Approach 1:
The patent implements local quality by assigning different adhesive characteristics to different regions: the first adhesive layer in the flexible area provides high flexibility for bending operations, while the second adhesive layer in the pad unit area provides high rigidity for stable chip mounting, eliminating the need to compromise either flexibility or rigidity.
Solution Approach 2:
The adhesive system functions as a composite structure with two different adhesive layers, each optimized for its specific region. This composite approach allows the display panel to simultaneously exhibit flexibility in the display area and rigidity in the pad unit area, resolving the contradiction between these opposing mechanical properties.
Data Source
AI summary
Provided is a flexible display apparatus in which flexibility is secured and reliability of products is improved, and a method of manufacturing the same. The flexible display apparatus includes a display panel including a flexible area and a non-flexible area and having one surface and the other surface opposite to the one surface; a protective film attached to the one surface of the display pane; a first adhesive layer interposed between the flexible area of the display panel and the protective film and configured to have a first storage modulus; and a second adhesive layer interposed between the non-flexible area of the display panel and the protective film and configured to have a second storage modulus.