Flexible Display Sheet Member for Stress Distribution
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Solution Overview
Problem
Portable information devices with flexible displays face failure due to insufficient curvature radius during repeated folding operations, leading to potential display issues when the curvature radius becomes smaller near fixed points.
Innovation Solution
A portable information device design featuring a flexible sheet-shaped member with strength changing sections that gradually decrease flexural strength from fixed points to inflection points, preventing excessive stress and peeling, and incorporating a conductive sheet for noise shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the display is folded with a small curvature radius to achieve a compact folding structure, then the device can be more compact when folded, but the display may fail due to excessive stress concentration at fixed points
Solution Approach 1:
The sheet-shaped member is designed with non-uniform flexural strength: high flexural strength near fixed points to withstand stress concentration, and low flexural strength in the folding region to enable smooth bending. This local differentiation of mechanical properties allows the structure to simultaneously achieve compact folding and maintain display reliability
Solution Approach 2:
The sheet-shaped member acts as a pre-designed stress buffer between the display and chassis. By positioning it to cover the folding region and fixed points, it beforehand cushions the stress that would otherwise concentrate on the display, preventing failure while enabling compact folding
2Reliability
If the sheet-shaped member has high flexural strength throughout to prevent display failure, then display reliability improves, but the folding region cannot achieve smooth bending and may crack
Solution Approach 1:
The sheet-shaped member is designed with spatially varying flexural strength: high strength sections at fixed points for durability, and low strength sections in the folding region for smooth bending. This local differentiation resolves the contradiction between reliability and folding smoothness
Solution Approach 2:
The sheet-shaped member's flexural strength is dynamically adapted to the functional requirements of different regions. The high flexural strength zones provide structural support where needed, while low flexural strength zones allow dynamic bending motion, enabling both reliability and ease of operation
Data Source
AI summary
A portable information device is described. The portable information device includes a first chassis, a second chassis, a display, and a flexible sheet-shaped member. The display includes a folding region located between the first and second chassis. The sheet-shaped member is attached to a first fixed point located at a position offset from a center of the folding region to a side of the first chassis, and is also attached to a second fixed point located at a position offset from the center of the folding region to a side of the second chassis. In addition, the sheet-shaped member includes a first strength changing section in which a flexural strength decreases gradually from the first fixed point towards a first inflection point, and a second strength changing section in which the flexural strength decreases gradually from the second fixed point towards a second inflection point.