Foldable Display Stress Buffer for Peeling and Crack Resistance
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Solution Overview
Problem
Conventional foldable display apparatuses suffer from durability defects such as peeling of the organic light-emitting layer and cracks in the protective parts due to repeated folding and unfolding.
Innovation Solution
Incorporating a first layer with a lower storage modulus than the cover window, and optionally a protective part with recesses, to reduce compressive stress and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional foldable display apparatus is used, then the display can be folded and unfolded, but durability defects such as peeling of the organic light-emitting layer and cracks in the protective part occur due to repeated folding and unfolding
Solution Approach 1:
A first layer with lower storage modulus than the cover window is introduced as an intermediary component between the display panel and the cover window. This intermediate layer acts as a stress buffer that reduces compressive stress during folding, preventing direct stress transmission that causes peeling and cracking, thereby resolving the contradiction between flexibility and structural integrity.
Solution Approach 2:
The storage modulus parameter of the first layer is specifically designed to be lower than that of the cover window. This parameter change creates a gradient structure where the softer first layer absorbs mechanical stress while the harder cover window maintains protective function, solving the durability issue without compromising structural strength.
2Area of stationary object
If the screen of the portable display apparatus is enlarged, then more information can be displayed, but portability is deteriorated
Solution Approach 1:
The display apparatus employs a dynamic folding mechanism that allows the large-screen display to be transformed into a compact form. The first layer with lower storage modulus enables controlled deformation during folding while maintaining display functionality, resolving the contradiction between large screen area and portability by making the structure dynamically adaptable.
3Reliability
If a protective part is added to protect the display panel, then durability is improved, but compressive stress during folding increases causing cracks
Solution Approach 1:
The protective structure is designed as a composite system consisting of the cover window and the first layer with different storage moduli. This composite structure allows the harder cover window to provide protection while the softer first layer absorbs compressive stress during folding, preventing stress concentration that would cause cracks in the protective part.
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
Reduces peeling of the organic light-emitting layer and cracks in the protective parts, while increasing puncture strength and durability of the foldable display apparatus.
Implementation Method 1
the first layer having a storage modulus lower than a storage modulus of the cover window
Data Source
AI summary
A foldable display apparatus includes a display panel, a cover window on the display panel, and a first layer between the display panel and the cover window, the first layer having a storage modulus lower than a storage modulus of the cover window to reduce durability defects in the apparatus. The apparatus may further include a protective part between the display panel and the cover window for distributing stress and further reducing durability defects.