Foldable Display Cushion Layering for Impact Absorption

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Solution Overview

Problem

Flexible display devices, particularly foldable ones, face challenges in absorbing and dispersing external shocks effectively, leading to potential damage from impacts and reduced durability.

Innovation Solution

A display device design incorporating a cushion member with a high-density layer and a low-density layer, each containing hollow particles, where the high-density layer has smaller hollow particles and higher density, and both layers are bonded with adhesive polymer resin, enhancing impact absorption and resilience.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single-density cushion layer is used, then the structure is simple, but the impact absorption and dispersion performance is insufficient

Engineering Contradiction:

Improveimpact absorption performanceVSAvoidcushion member structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cushion member is divided into multiple layers with different densities (first cushion layer with higher density, second cushion layer with lower density). Each layer absorbs impact at different stages, with the higher-density layer handling initial impact and the lower-density layer providing subsequent cushioning, thereby improving overall impact absorption performance while maintaining structural organization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the cushion member are assigned different density characteristics. The first cushion layer closer to the display panel uses higher density for immediate impact resistance, while the second cushion layer uses lower density for gentle cushioning. This local differentiation optimizes impact dispersion across the cushion member structure.

Inventive Principle:

Principle #3Local quality

2Reliability

If the cushion member is made thicker to improve shock absorption, then impact absorption improves, but the device thickness increases

Engineering Contradiction:

Improveshock absorptionVSAvoiddevice thickness

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The cushion member combines different density materials in a layered composite structure. The higher-density first cushion layer and lower-density second cushion layer work together to provide enhanced shock absorption within a compact total thickness. This composite approach achieves better impact dispersion than a single uniform material would allow.

Inventive Principle:

Principle #40Composite materials

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 design improves the device's durability by effectively absorbing and dispersing external shocks, maintaining resilience, and allows for a slim, flexible display device.

Implementation Method 1

a cushion member disposed on a rear surface of the display panel, where the cushion member includes a high-density layer and a layer on the high-density layer, and a low-density layer disposed on the buffer layer

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

each of the high-density layer and the low-density layer includes an adhesive polymer resin

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS20250390145A1Display device and electronic device including the same

Publication Date: 2025.12.25 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a display panel, a window disposed on a side of the display panel, and a cushion member disposed on a rear surface of the display panel, where the cushion member includes a high-density layer and a buffer layer on the high-density layer, and a low-density layer disposed on the buffer layer, where the low-density layer is disposed closer to the display panel than to the high-density layer.