Foldable Sheet Lattice Bending Area Crease Prevention
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Solution Overview
Problem
Foldable electronic devices experience creasing and deformation issues due to repeated folding, leading to a rough touch feel and aesthetic deterioration, as the accumulation of plastic deformations causes permanent bends in the display panel.
Innovation Solution
A foldable sheet with a lattice pattern and bending areas that are bent at least twice to protrude in the unfolding direction, allowing the bodies to be arranged in parallel, thereby preventing creases and enhancing deformation flexibility and accuracy in coupling with display panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a foldable sheet is used to enable folding operations, then portability and screen size are improved, but creases and permanent deformations occur due to repeated folding
Solution Approach 1:
The foldable sheet is divided into a folding area with a lattice pattern and body areas. The lattice pattern segments the structure into multiple small units that can deform independently, distributing the stress of repeated folding across many small segments rather than concentrating it in one location, thereby preventing permanent creases and maintaining structural integrity.
Solution Approach 2:
Different areas of the foldable sheet are given different structural properties. The folding area has a lattice pattern providing flexibility and deformation space, while the body areas maintain solid structure for stability. This local differentiation allows the folding region to accommodate repeated folding without transmitting permanent deformation to the entire sheet.
2Ease of manufacture
If the foldable sheet structure is simplified, then manufacturing ease is improved, but deformation flexibility and crease prevention are reduced
Solution Approach 1:
The folding area employs a lattice pattern that creates a porous or honeycomb-like structure. This lattice structure is relatively simple to manufacture using standard fabrication techniques while providing excellent deformation flexibility. The porous lattice allows the material to compress and expand during folding without requiring complex mechanisms, achieving both manufacturing ease and functional flexibility.
Data Source
AI summary
A foldable sheet of an embodiment may include a body area including a first body and a second body spaced apart from the first body, a folding area positioned between the first body and the second body and folded in a first direction so that the first body and the second body face each other, a bending area including a first bending area for connecting one end of the folding area and the first body, and a second bending area for connecting the other end of the folding area and the second body. The bending area may have a structure which is bent at least twice to protrude in a second direction opposite to the first direction so that the first body and the second body are arranged in parallel to each other in a state where the folding area is unfolded.