Flexible Display End Parts with Concave Shape for Stress Distribution

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Solution Overview

Problem

Flexible display devices face durability issues due to stress concentration at the end parts when folded, leading to potential breakage.

Innovation Solution

The flexible display device is designed with end parts of the folding sections formed in a concave shape to distribute stress evenly, preventing concentration and enhancing durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the flexible display is folded at one or more positions, then the display device can be rolled, folded, stored or carried like cloth, but stress concentrates on both end parts of the folding part, reducing durability

Engineering Contradiction:

ImprovefoldabilityVSAvoiddurability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The end parts of the folding part are given a different shape (concave) compared to the rest of the flexible display. This local structural differentiation allows the end parts to better withstand stress concentration during folding, while the main body maintains its foldability. The concave shape creates a gradual transition that distributes mechanical stress more effectively at the critical end regions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The end parts of the folding part are formed with a concave curvature instead of a straight or convex edge. This curved geometry helps distribute the stress that occurs during folding by creating a gradual transition zone, reducing the peak stress concentration at the ends of the folding part and thereby improving durability while maintaining foldability.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Volume of moving object

If the flexible display is folded, then the display device can be compactly stored and carried, but gaps may occur at seam parts, affecting display quality

Engineering Contradiction:

Improvestorage compactnessVSAvoidseam alignment

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The concave shape at the end parts of the folding part creates a localized structural feature that helps maintain alignment between folded sections. This local geometric modification ensures that when the flexible display is folded and stored, the seam parts remain properly aligned, preventing gaps and maintaining display quality while achieving compact storage.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10777758B2Display device

Publication Date: 2020.09.15 SHARP KK

AI summary

A display device includes one flexible display panel (2) having at least one part at which the one flexible display panel (2) is folded, at least one of end parts (21) of the at least one part is formed so as to have a concave shape.