Foldable Display Middle Frame Stress Management
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Solution Overview
Problem
Conventional foldable display devices experience transfer or distortion of the display screen and sagging of the display panel due to material irregularities and stress on the folding part, especially under high-temperature, high-humidity conditions, which affects their folding characteristics.
Innovation Solution
A foldable display device design featuring a display panel with folding and non-folding parts supported by middle frames with specific folding patterns and opening patterns, where the middle frames include bars and slits aligned differently to minimize stress and allow independent slippage, enhancing support and folding stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a soft structure including silicone resin is used for the folding part of the middle frame, then the display panel can be folded, but the display panel may swell or sag when folded multiple times
Solution Approach 1:
The patent changes the material parameter from soft silicone resin to rigid plastic for the folding part of the middle frame. This parameter change maintains folding capability while preventing display panel swelling and sagging, as the rigid plastic provides sufficient structural support even in the folding region.
Solution Approach 2:
The patent uses the same material (rigid plastic) for both the folding part and non-folding part of the middle frame. This homogeneity eliminates material interface irregularities that cause display screen transfer and distortion, while maintaining uniform mechanical properties throughout the frame structure.
2Strength
If different materials are used for the folding part and non-folding part of the middle frame, then the display panel can be protected, but irregularities are formed at the interface between different materials
Solution Approach 1:
The patent applies homogeneity by using the same rigid plastic material throughout the entire middle frame, including both folding and non-folding parts. This eliminates the material interface that would otherwise create irregularities causing display screen transfer and distortion, while maintaining adequate protection through uniform material properties.
3Ease of operation
If a soft folding part is used in the middle frame, then the display panel can be folded, but the folding part may be deformed or hardened under high-temperature, high-humidity conditions
Solution Approach 1:
The patent changes the material parameter from soft silicone resin to rigid plastic for the folding part. This parameter change eliminates the deformation and hardening issues that occur under high-temperature, high-humidity conditions, as rigid plastic maintains its mechanical properties and dimensional stability in harsh environments while still allowing folding operation.
Data Source
AI summary
A foldable display device that reduces a transfer or distortion phenomenon of a folding part, prevents a display panel from sagging, and exhibits excellent folding characteristics. The foldable display device includes a display panel including a folding part and a non-folding part, a plurality of middle frames disposed at the lower surface of the display panel, and a bottom case for receiving the display panel and the middle frames. Each of the middle frames includes a frame folding part located at a region corresponding to the folding part of the display panel and a plurality of plates located at a region corresponding to the non-folding part of the display panel.