Foldable OLED Display Magnetic Hinge for Adhesion Stability

Solution Overview

Problem

The low adhesion stability between the display screen and the middle frame in flexible and foldable OLED display devices leads to issues such as easy detachment, floating, and bubble formation, which affect display quality and allow foreign matter intrusion.

Innovation Solution

An OLED display device comprising a display panel attached to a metal sheet with a magnet sheet on its foldable area, opposite to a hub piece on the middle frame, enhancing adhesion stability by using a magnetically attracted hinge mechanism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If adhesive is used to fix the display screen to the middle frame, then adhesion stability is improved, but in the foldable area where no adhesive is used, adhesion stability deteriorates causing easy detachment and floating

Engineering Contradiction:

Improveadhesion stabilityVSAvoidfolding operation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the mechanical adhesive bonding system with a magnetic field-based holding system. Magnets are embedded in the middle frame at the foldable area, creating magnetic attraction forces that replace the adhesive's holding function. This allows the display screen to be securely held without physical adhesive contact, solving the contradiction between adhesion stability and folding operation ease.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces magnets as an intermediary element between the middle frame and the display screen. These magnets create an invisible magnetic field that acts as a mediator to provide holding force in the foldable area, eliminating the need for direct adhesive bonding while maintaining secure attachment during folding operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If no adhesive is used in the foldable area to enable movement, then folding operation is improved, but adhesion stability deteriorates causing detachment and floating

Engineering Contradiction:

Improvefolding operationVSAvoidadhesion stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent replaces the mechanical adhesive bonding system with a magnetic field-based holding system. Magnets are embedded in the middle frame at the foldable area, creating magnetic attraction forces that replace the adhesive's holding function. This allows the display screen to be securely held without physical adhesive contact, solving the contradiction between adhesion stability and folding operation ease.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces magnets as an intermediary element between the middle frame and the display screen. These magnets create an invisible magnetic field that acts as a mediator to provide holding force in the foldable area, eliminating the need for direct adhesive bonding while maintaining secure attachment during folding operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If adhesive is used to ensure adhesion stability, then detachment is prevented, but bubble formation and foreign matter intrusion occur affecting display quality

Engineering Contradiction:

Improveadhesion stabilityVSAvoidbubble formation and foreign matter intrusion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical adhesive bonding system with a magnetic field-based holding system. By eliminating physical adhesive contact in the foldable area, the source of bubbles and foreign matter entrapment is removed, while magnetic attraction continues to provide secure holding without causing these harmful effects.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces magnets as an intermediary element that creates a contactless holding force through magnetic fields. This intermediary magnetic field provides adhesion stability without the physical contact that causes bubble formation and foreign matter intrusion, thereby improving display quality.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Improves adhesion stability during folding and unfolding, preventing detachment and bubble formation, thereby maintaining display quality and preventing foreign matter intrusion.

Implementation Method 1

the magnet sheet is disposed opposite to the hub piece. Therefore, the adhesion stability of the middle frame and the display panel can be improved, and the display panel and the middle frame will not easily fall off when the OLED display device is folded

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentEP4131389B1OLED display device

Publication Date: 2026.03.11 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

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AI summary

An OLED display device includes a display panel, a metal sheet, and a middle frame. The display panel is closely attached to one side of the metal sheet, and is defined with a foldable area and a non-foldable area. The metal sheet is disposed between the middle frame and the display panel. The middle frame is disposed on one side of the metal sheet facing away from the display panel. The foldable area of the middle frame is disposed with a hub piece, and the foldable area of the metal sheet is disposed with a magnet sheet, and the magnet sheet is disposed opposite to the hub piece.