Foldable Support Plate Structure for Low-Stress Flexible Display Bending
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Solution Overview
Problem
Existing foldable electronic devices face challenges in maintaining mechanical stability, anti-extrusion performance, and bending performance while minimizing weight and impact on radio frequency performance.
Innovation Solution
A foldable support plate with a first transition support portion having a smaller bending radius and grooves, combined with local plating and varying material rigidity, enhances mechanical stability and reduces stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common methods are used to improve mechanical stability, then anti-extrusion performance and bending performance are improved, but total weight increases and radio frequency performance is affected
Solution Approach 1:
The support plate employs local quality by creating through grooves only in specific regions where stress concentration occurs during folding, rather than uniformly reinforcing the entire plate. This allows the plate to maintain mechanical stability at critical bending zones while keeping other areas lightweight, thus resolving the contradiction between mechanical stability and total weight.
Solution Approach 2:
The support plate uses composite material structure combining metal base material with groove features that create a hierarchical structure. This composite design provides enhanced mechanical properties and stress distribution at the groove locations while maintaining overall light weight, addressing both mechanical stability and weight concerns.
2Volume of moving object
If the folding radius is small, then the device is more compact, but the flexible display is prone to wrinkles and components may separate
Solution Approach 1:
The support plate incorporates through grooves that create a porous-like structure with controlled voids. These grooves allow the plate to flex more easily during folding while maintaining structural integrity, enabling smaller folding radius without causing display wrinkles or component separation, thus resolving the contradiction between compact folded size and display integrity.
3Strength
If the support plate is made thicker to improve anti-extrusion performance, then mechanical strength increases, but bending flexibility decreases
Solution Approach 1:
The support plate is segmented through the creation of through grooves that divide the plate into multiple regions. This segmentation allows different parts of the plate to have different functional characteristics - regions with grooves provide flexibility for bending while regions between grooves maintain strength for anti-extrusion performance, thus resolving the contradiction between strength and bending flexibility.
Data Source
AI summary
This application prides relates to a foldable support plate, a flexible display module, and a foldable electronic device. In an example, a foldable support plate includes a first support portion, a foldable support portion, and a first transition support portion. When the foldable support plate is folded, the first support portion is in a flat state. The foldable support portion is in a bent state when the foldable support plate is folded. The first transition support portion is connected between the first support portion and the foldable support portion. A bending radian of the first transition support portion is less than a bending radian of the foldable support portion when the foldable support plate is folded.