Porous Heat-Spreading Substrate for OLED Burn-In and Impact Protection

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Solution Overview

Problem

Displays, particularly OLEDs, are susceptible to image sticking due to thermal burn-in and physical damage from impacts, leading to permanent or temporary image retention and breakage.

Innovation Solution

A porous heat spreading cushion layer is integrated into the display, comprising a flexible porous substrate with a polymeric material, coated with electroless copper and carbon nanotubes, to absorb and spread heat, and provide cushioning against physical shocks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a light emitting layer is used to display images, then information can be output to users, but thermal burn-in occurs causing image sticking

Engineering Contradiction:

Improvelight emissionVSAvoidimage retention

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

A heat spreading layer is introduced as an intermediary component between the light emitting layer and the environment. This layer absorbs and redistributes heat away from the light emitting layer, preventing localized thermal accumulation that causes image sticking, while not interfering with the light emission function.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the thermal parameters of the display structure by introducing a heat spreading layer with specific thermal conductivity properties. This modifies the heat distribution pattern, transforming concentrated heat into dispersed heat, thereby preventing thermal burn-in while maintaining light emission.

Inventive Principle:

Principle #35Parameter changes

2Length of moving object

If the display is made thin and flexible, then device portability is improved, but susceptibility to physical shock damage increases

Engineering Contradiction:

Improvedisplay thicknessVSAvoidimpact resistance

Core Design Contradiction:

Length of moving objectVSReliability

Solution Approach 1:

A cushioning layer is integrated into the display structure in advance, positioned to provide mechanical protection before impact occurs. This layer absorbs and dissipates impact energy, protecting the thin display from shock damage while maintaining the overall thin profile.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The display employs a composite structure combining multiple materials with different properties - a thin flexible substrate for portability, a heat spreading layer for thermal management, and a cushioning layer for mechanical protection. This composite approach achieves both thinness and impact resistance simultaneously.

Inventive Principle:

Principle #40Composite materials

3Use of energy by moving object

If heat is generated by light emission, then display function is achieved, but thermal accumulation causes permanent damage

Engineering Contradiction:

Improvelight emission energyVSAvoidthermal damage

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The heat generated by light emission, which is normally a harmful byproduct causing thermal damage, is converted into a beneficial effect by using it to warm the heat spreading layer. This layer then acts as a thermal reservoir and distribution system, preventing localized overheating and converting waste heat into useful thermal management.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 prevents thermal burn-in and protects the display from physical damage by dissipating heat and absorbing impact energy, maintaining display integrity.

Implementation Method 1

The porous heat spreading cushion layer can be placed adjacent to the display to absorb and spread the heat generated by the display

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

The porous substrate can provide a physical cushion to the display and can absorb impact energy due to physical shock

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 3

A first electroless copper coating can be positioned between the porous substrate and the light emitting layer. A second electroless copper coating can be positioned between the porous substrate and the cover layer

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS12431043B2Heat spreading substrate for a display

Publication Date: 2025.09.30 HEWLETT PACKARD DEVELOPMENT COMPANY LP

AI summary

The present disclosure is drawn to displays for electronic devices. In one example, the display includes a light emitting layer with an organic light emitting element. A porous substrate can be attached to the light emitting layer, wherein the porous substrate is flexible and spreads heat generated by the light emitting layer. A cover layer can be attached to a surface of the porous substrate opposite the light emitting layer.