Foldable Display Layer Structure for Stress-Relieving Crack Resistance
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Solution Overview
Problem
Foldable display apparatuses experience defects such as cracks due to compression and tensile stress from repeated bending in the folding area, which is not adequately addressed by existing technologies.
Innovation Solution
A display apparatus design featuring a folding area with inflection points and symmetrical empty spaces between layers, including a first layer with a space portion and a second layer with greater rigidity, to absorb stress and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display apparatus is folded repeatedly, then the display apparatus can be compacted and transported easily, but compression and tensile stress occur in the folding area causing cracks and defects
Solution Approach 1:
The patent introduces empty spaces between layers in the inflection areas before folding occurs, which act as cushioning zones to absorb compression and tensile stress during repeated folding operations, preventing cracks and maintaining structural integrity
Solution Approach 2:
The patent applies different structural characteristics to different areas: the inflection areas have empty spaces between layers to accommodate stress, while other areas maintain normal layered structure for structural support and functionality
2Volume of moving object
If layers are closely stacked to reduce thickness, then the display apparatus becomes thinner and more compact, but stress concentration increases in the folding area leading to cracks
Solution Approach 1:
Empty spaces are pre-formed between layers in the inflection areas to serve as cushioning zones that absorb stress during folding, preventing stress concentration that would otherwise cause cracks in thin, closely-stacked structures
Solution Approach 2:
The patent resolves the thickness-stress contradiction by introducing a new dimensional feature (empty spaces in the thickness direction) that allows stress absorption without significantly increasing overall device thickness
Data Source
AI summary
A display apparatus includes a display module having a folding area and inflection areas respectively on both sides of the folding area in a first direction, a first layer on a surface of the display module opposite to a display surface thereof, and a second layer on a surface of the first layer opposite to the display module. An empty space is defined between the display module and the second layer in a thickness direction in the inflection area.