Negative-Poisson Stretchable Display for Aspect Ratio Stability

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Solution Overview

Problem

Existing stretchable displays suffer from aspect ratio distortion and limited stretching due to contraction in directions perpendicular to the stretching direction, leading to low aperture ratio and limited integration of light emitting elements.

Innovation Solution

A stretchable display with a negative Poisson's ratio structure, comprising cores with light emitting elements and wires wound in opposite directions, allowing expansion or contraction in both X and Y directions simultaneously, maintaining aspect ratio and improving element integration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a traditional stretchable display structure is used, then the display can be stretched, but the aspect ratio is not maintained due to contraction in the perpendicular direction

Engineering Contradiction:

ImprovestretchabilityVSAvoidaspect ratio

Core Design Contradiction:

Adaptability or versatilityVSShape

Solution Approach 1:

The patent applies the inversion principle by designing a structure with negative Poisson's ratio, where the conventional behavior of material contraction in the perpendicular direction during stretching is reversed. The alternating wound wire configuration causes the structure to expand in both longitudinal and transverse directions simultaneously, maintaining aspect ratio while enabling stretchability.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent employs asymmetry through the alternating wound directions of adjacent wires. First wires are wound in one direction while second wires are wound in the opposite direction, creating an asymmetric structure that produces symmetric expansion behavior in both directions during stretching, thus preserving aspect ratio.

Inventive Principle:

Principle #4Asymmetry

2Adaptability or versatility

If new elastic materials are introduced to make the substrate stretchable, then the display becomes stretchable, but the cost increases significantly

Engineering Contradiction:

ImprovestretchabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent changes the structural parameters of the existing display components by introducing alternating wound directions and specific geometric configurations of wires and cores. This structural parameter modification enables stretchability using conventional materials and manufacturing processes, avoiding the need for expensive elastic substrates while maintaining the stretchable function.

Inventive Principle:

Principle #35Parameter changes

3Length of moving object

If the display is stretched in one direction, then the display can be expanded, but the aperture ratio decreases and image distortion occurs

Engineering Contradiction:

Improvedisplay sizeVSAvoidimage quality

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The patent inverts the conventional stretching behavior by creating a negative Poisson's ratio structure. When stretched in one direction, the alternating wound wire configuration causes expansion in the perpendicular direction instead of contraction, maintaining the aperture ratio and preventing image distortion while achieving display expansion.

Inventive Principle:

Principle #13The other way round (Inversion)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The display maintains image aspect ratio and reduces distortion during stretching by expanding in perpendicular directions, enhancing the integration and aperture ratio of light emitting elements.

Implementation Method 1

A stretchable display having a negative Poisson's ratio according to an embodiment of the present invention includes a first core in which a first light emitting element is installed, a second core which is positioned next to the first core and in which a second light emitting element is installed

Methodology Applied

Scientific EffectNegative Poisson's ratio: Poisson's Effect

Data Source

PatentUS12602083B2Stretchable display having negative Poisson's ratio

Publication Date: 2026.04.14 SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

AI summary

Provided is a stretchable display having a negative Poisson's ratio including: a first core on which a first light-emitting element is installed; a second core positioned next to the first core and on which a second light-emitting element is installed; multiple first wires coming out from one side of the first core and wound in one direction around the first core; and multiple second wires coming out from one side of the second core and wound in the opposite direction to the first wire around the second core, wherein any of the multiple first wires and any of the multiple second wires are connected between the first core and the second core in a connection part, and when a distance between the first core and the second core increases, the first wires are unwound while the first core rotates, and the second wires are unwound while the second core rotates.