Oblique Hole Support Plate for Foldable Display Stress Relief
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Solution Overview
Problem
The bending performance of foldable phones is affected by the reinforcing steel sheet, which does not adequately distribute stress during bending, leading to potential issues with the display panel's support and reliability.
Innovation Solution
A support plate with a bendable region and a pattern region featuring oblique holes that intersect with the thickness direction at a non-zero angle, optimizing stress distribution and improving bending performance by reducing maximum stress concentration on flat surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a reinforcing steel sheet is used to support the display panel in a foldable phone, then the structural strength is improved, but the bending performance deteriorates due to stress concentration on flat surfaces
Solution Approach 1:
The support plate incorporates a pattern region with multiple holes (through holes or blind holes) distributed across the bendable region and flat regions. This porous structure reduces stress concentration during bending by distributing mechanical loads across the hole boundaries, preventing stress accumulation that would occur in solid flat surfaces. The holes create stress relief zones that improve bending performance while maintaining overall structural integrity.
Solution Approach 2:
The support plate features different structural characteristics in different regions: the pattern region with holes is located in the bendable region and extends into flat regions, while the non-pattern regions maintain solid structure. This local differentiation allows the bendable region to flex more easily during folding operations, while the flat regions retain sufficient structural strength for supporting the display panel in its unfolded state.
2Ease of manufacture
If a solid flat support plate is used, then the manufacturing simplicity is improved, but the stress distribution during bending deteriorates leading to peeling risks
Solution Approach 1:
The pattern region with holes is designed to cover the bendable region and extend into flat regions, creating a porous structure that improves stress distribution during bending. This hole pattern prevents stress concentration at the interface between the support plate and display panel, reducing peeling risks while maintaining reasonable manufacturing complexity through standard drilling or punching processes.
Data Source
AI summary
Provided are a support plate, a display apparatus and an electronic device. The support plate includes flat regions including first and second flat regions spaced apart along a first direction, a bendable region between the first and second flat regions, and a pattern region covering at least the bendable region. A plurality of hole groups arranged along the first direction are disposed in the pattern region, and each hole group includes a plurality of holes at intervals along a second direction. At least two of holes in part of the pattern region covering the bendable region are oblique holes, and central axes of the oblique holes intersect with a thickness direction of the bendable region at a non-zero included angle. The central axes of the oblique holes are located in a first datum plane, and the bendable region bends along the thickness direction perpendicular to the first and second directions.