Flexible Display Bending Structure With Stress-Reducing Space
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Solution Overview
Problem
The flexible display apparatus experiences high tensile stress during bending, leading to damage of signal lines and defects such as dark and bright lines due to the deformation around the bending portion.
Innovation Solution
A stress-reducing space is introduced in the display apparatus, featuring side walls formed by exposed surfaces of back films, metal plates, and support layers, which reduces tensile stress by extending into the gap between the back film and support layer, and aligning the back film edges to create a space that alleviates stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bending portion is made flexible to enable device deformation, then adaptability is improved, but tensile stress concentration occurs causing signal line damage
Solution Approach 1:
A stress-reducing space is pre-formed at the bending portion before the device is bent. This space acts as a cushion that absorbs and distributes tensile stress during bending, preventing stress concentration that would otherwise damage signal lines. The space is created by defining a region with reduced material density or void space at the bending portion.
Solution Approach 2:
The bending portion is structured with a porous or void-containing configuration. This porous structure allows the material to deform more easily under bending stress while maintaining structural integrity. The voids or porous regions compress and expand during bending, reducing the transmission of stress to the signal lines.
2Ease of manufacture
If the bending portion structure is simplified to reduce manufacturing complexity, then ease of manufacture is improved, but stress concentration increases causing display defects
Solution Approach 1:
The bending portion is segmented into distinct functional zones: a stress-reducing space region, a transition region, and a rigid support region. This segmentation allows each zone to perform its specific function - the stress-reducing space absorbs stress, the transition region gradually transfers load, and the rigid region provides structural support - thereby achieving uniform stress distribution without overly complex manufacturing.
3Strength
If material density is increased to improve structural strength, then strength is improved, but tensile stress concentration worsens during bending
Solution Approach 1:
Different regions of the bending portion have different material densities optimized for their specific functions. The stress-reducing space has lower density to absorb stress, while other regions maintain higher density for structural support. This local variation in material quality allows the structure to be both strong and stress-resistant during bending.
Data Source
AI summary
A display apparatus is provided. The display apparatus includes a display panel having a display portion in a display region, a connecting portion, and a bending portion; a cover window on a first side of the display portion; a support layer between the display portion and the connecting portion; a first back film covering a back surface of the connecting portion, the first back film on a side of the connecting portion closer to the display portion; a metal plate between the support layer and the display portion; a second back film covering a surface of the display portion facing the connecting portion; and a metal support layer between the metal plate and the second back film. The bending portion connects the display portion and the connecting portion. The display apparatus includes a stress-reducing space. The stress-reducing space is open to the bending cavity.