Foldable Display Bottom Plate for Bubble Venting and Heat Dissipation

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Solution Overview

Problem

Electroluminescent display devices face issues with screen defects due to bubbles generated during lamination and heat dissipation challenges, particularly in foldable display devices.

Innovation Solution

A foldable display device design featuring a bottom plate with folding patterns and aperture patterns that allow bubble venting and improved heat dissipation, including a system middle frame and a foldable display module with a display panel, bottom plate, and driving circuit unit, utilizing adhesives and metal layers for structural support and thermal management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a lamination process is used to bond the display module, then structural integrity is improved, but bubbles are generated causing screen defects

Engineering Contradiction:

Improvebonding strengthVSAvoidscreen defects

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by providing predetermined venting paths and aperture patterns in the bottom plate before the lamination process. These pre-designed pathways allow bubbles to escape during bonding, preventing screen defects while maintaining bonding strength.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent extracts the harmful bubbles from the bonding interface by designing aperture patterns that create dedicated escape routes. The bubbles are removed from the adhesive layer through these apertures, preventing them from remaining trapped and causing screen defects.

Inventive Principle:

Principle #2Taking out (Extraction)

2Power

If circuit components are heated for operation, then display functionality is improved, but heat accumulation causes afterimage phenomenon

Engineering Contradiction:

Improvedisplay functionalityVSAvoidheat accumulation

Core Design Contradiction:

PowerVSTemperature

Solution Approach 1:

The patent converts the harmful heat accumulation into a beneficial effect by designing the aperture patterns to serve dual purposes: venting bubbles during bonding and facilitating heat dissipation during operation. The same structural features that remove bubbles also create pathways for heat to escape, preventing afterimage phenomenon.

Inventive Principle:

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

Solution Approach 2:

The aperture patterns in the bottom plate perform multiple functions: they act as bubble venting paths during the lamination process and as heat dissipation pathways during display operation. This multi-functionality allows the same structure to address both manufacturing defects and operational thermal issues.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Strength

If adhesive is applied extensively for bonding, then bonding coverage is improved, but adhesive degradation increases reducing lifespan

Engineering Contradiction:

Improvebonding coverageVSAvoiddisplay lifespan

Core Design Contradiction:

StrengthVSDuration of action of stationary object

Solution Approach 1:

The patent segments the adhesive bonding area by introducing aperture patterns that divide the continuous adhesive layer into separated regions. This segmentation reduces the total amount of adhesive required and prevents excessive adhesive from degrading, thereby extending display lifespan while maintaining adequate bonding coverage.

Inventive Principle:

Principle #1Segmentation

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 effectively removes bubbles and enhances heat dissipation, reducing screen defects and increasing the lifespan of the display panel while minimizing adhesive degradation and power consumption.

Implementation Method 1

a bottom plate that is bonded between the display panel and the system middle frame and includes a plurality of folding patterns disposed in the folding area and a plurality of aperture patterns disposed in the plurality of flat areas

Methodology Applied

Scientific EffectBubble venting:

Implementation Method 2

The design effectively removes bubbles and enhances heat dissipation, reducing screen defects and increasing the lifespan of the display panel

Methodology Applied

Scientific EffectHeat dissipation:

Data Source

PatentUS20250275071A1Display Device

Publication Date: 2025.08.28 LG DISPLAY CO LTD

AI summary

Disclosed is a display device in which bubbles generated in a bonding process of a display module can be eliminated, which comprises a foldable display device comprising a system middle frame capable of folding relative to a folding axis, and a foldable display module having a folding area that is bonded with the system middle frame and capable of folding relative to the folding axis, and a plurality of flat areas connected through the folding area, wherein the foldable display module comprises a display panel including the plurality of flat areas and the folding area, and a bottom plate that is bonded between the display panel and the system middle frame and includes a plurality of folding patterns disposed in the folding area and a plurality of aperture patterns disposed in the plurality of flat areas.