Porous-Metal Display Substrate for Sealing Film Stress Reduction

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Solution Overview

Problem

Display panels deformed into non-flat shapes experience bending stress, leading to potential damage and deterioration of image quality due to uneven tensile and compressive forces on the sealing film.

Innovation Solution

A display apparatus with a porous-metal substrate composed of a single layer of porous metal material is used below the display panel, featuring different thicknesses in its bent substrate portions to adjust the neutral plane, reducing the impact of tensile forces on the sealing film.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the display panel is deformed into a non-flat shape, then the display apparatus achieves flexible form factor and adaptability, but the sealing film is damaged and image quality deteriorates due to bending stress

Engineering Contradiction:

Improveflexible form factorVSAvoidsealing film integrity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the physical parameters of the substrate by introducing a porous structure with controlled porosity (30-70%) and varying thickness. This porous metal substrate can absorb and distribute bending stresses, preventing stress concentration on the sealing film while maintaining the flexible form factor of the display panel.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite structure combining a porous metal substrate with the display panel and cover substrate. The porous metal substrate acts as a shock-absorbing layer that dissipates bending energy, protecting the sealing film from damage while enabling flexible deformation of the overall display apparatus.

Inventive Principle:

Principle #40Composite materials

2Strength

If the neutral plane is positioned closer to the sealing film, then the structural strength is improved, but the tensile stress on the sealing film increases and causes damage

Engineering Contradiction:

Improvestructural strengthVSAvoidtensile stress on sealing film

Core Design Contradiction:

StrengthVSStress or pressure

Solution Approach 1:

The patent controls the thickness of the porous metal substrate to adjust the position of the neutral plane. By optimizing the substrate thickness, the neutral plane is positioned away from the sealing film, reducing tensile stress on the sealing film while maintaining adequate structural strength through the porous metal support structure.

Inventive Principle:

Principle #35Parameter changes

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 solution effectively displaces the neutral plane to minimize the tensile stress range on the sealing film, thereby reducing damage and extending the lifespan of the display panel.

Implementation Method 1

a porous-metal substrate disposed below the display panel and formed of a porous metal material

Methodology Applied

Scientific EffectPorous material absorption: Porosity

Implementation Method 2

Since the porous metal material has thermal conductivity and shock absorption function

Methodology Applied

Scientific EffectShock absorption: Damping

Implementation Method 3

Since the porous metal material has thermal conductivity and shock absorption function

Methodology Applied

Scientific EffectThermal conductivity: Conduction (thermal)

Data Source

PatentUS20250221291A1Display apparatus including electric conductive substrate having spacer

Publication Date: 2025.07.03 LG DISPLAY CO LTD

AI summary

A display apparatus includes a display panel including a display area, a porous-metal substrate disposed below the display panel and including a porous metal material, and a cover substrate disposed above the display panel. The porous-metal substrate includes a flat substrate portion and first and second bent substrate portions convexly curved in opposite directions, and thicknesses of the first and second bent substrate portions are different from each other.