Rollable Display Bent Opening Stress Distribution
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Solution Overview
Problem
Conventional rollable display devices face issues with stress distribution on flexible panels, leading to defective pixels and deteriorated image quality due to uneven stress on exposed and connected portions.
Innovation Solution
The design incorporates a housing with a bent opening portion and a grip with a bent coupling recess, allowing the flexible display panel to be bent and distributed stress evenly, minimizing stress on pixels and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible display panel is pulled out through a straight opening, then the device structure is simple, but stress concentrates on pixels causing defective pixels and deteriorated image quality
Solution Approach 1:
The opening portion is designed with a bent shape including first and second bent portions with different radii of curvature. This curved geometry distributes stress evenly across the flexible display panel during extraction, preventing pixel damage while maintaining structural integrity. The varying radii of curvature optimize stress distribution at different locations.
2Reliability
If the opening portion has varying radius of curvature, then stress distribution is improved, but manufacturing precision requirements increase
Solution Approach 1:
The bent opening portion is divided into multiple segments with different radii of curvature (first bent portion and second bent portion). Each segment can be independently formed or adjusted, allowing precise control over stress distribution characteristics while simplifying the manufacturing process through modular fabrication.
3Reliability
If the flexible display panel is bent during extraction, then stress on pixels is reduced, but the grip and coupling mechanism become more complex
Solution Approach 1:
The grip includes a coupling recess with a bent shape that matches the curvature of the flexible display panel. This curved coupling interface naturally guides the panel through the opening portion in a bent trajectory, reducing pixel stress while integrating seamlessly with the opening portion geometry.
4Reliability
If the external panel has multi-radius curvature, then stress distribution is optimized, but the display panel manufacturing becomes more difficult
Solution Approach 1:
The external panel is divided into multiple regions with different radii of curvature, allowing each region to be manufactured separately or with different processes. This segmentation enables optimized stress distribution while maintaining manufacturing feasibility through modular production approaches.
Data Source
AI summary
A rollable display device includes a flexible display panel displaying an image, a housing accommodating the flexible display panel in a rolled state, the housing having a bent opening portion through which the flexible display panel is pulled out, and a grip attached to the flexible display panel, the grip pulling the flexible display panel out of the housing by an external force.