Foldable Display Hinge Assembly for Crease and Thickness Control

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Solution Overview

Problem

Conventional foldable display devices suffer from creases during use and increased thickness during carrying due to inadequate folding mechanisms.

Innovation Solution

A display device with a hinge assembly comprising a lever, link, and roller system that allows for differential rotation trajectories, supported by wing plates with varying thicknesses, preventing wrinkles during use and compensating for thickness changes during carrying.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a conventional folding mechanism is used, then the display device can be folded for portability, but creases and wrinkles occur during use

Engineering Contradiction:

Improvefolding capabilityVSAvoiddisplay quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements a dynamic hinge assembly with multiple moving components (lever, link, roller) that adapt the folding mechanism's behavior based on the display's state. The roller moves along a curved trajectory guided by the lever-link mechanism, dynamically adjusting support positions to prevent wrinkles during use while enabling folding for portability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent introduces a wing plate as an intermediary component between the display module and the hinge assembly. This wing plate with varying thickness acts as a mediator that distributes mechanical stress and provides differential support, preventing direct contact that would cause creases while maintaining the folding capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If a conventional folding mechanism is used, then the display device can be folded for portability, but thickness increases during carrying

Engineering Contradiction:

Improvefolding capabilityVSAvoidthickness

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The wing plate is designed with varying thickness (first portion with greater thickness, second portion with smaller thickness) to provide localized support where needed. This local quality differentiation allows the structure to maintain compactness in carrying position while providing support to prevent wrinkles during use, optimizing both portability and display quality.

Inventive Principle:

Principle #3Local quality

3Manufacturing precision

If a hinge assembly with lever and link is used, then differential rotation trajectories can be achieved, but device complexity increases

Engineering Contradiction:

Improvefolding precisionVSAvoidhinge assembly complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent combines the lever, link, and roller into an integrated hinge assembly where components work together as a unified mechanism. The lever rotates around a first rotation axis, the link rotates around a second rotation axis, and the roller is guided by both, merging multiple functions into a single compact assembly that achieves differential rotation trajectories without excessive complexity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20260068067A1Display device and electronic device including the same

Publication Date: 2026.03.05 SAMSUNG DISPLAY CO LTD

AI summary

Provided is a display device including a display module including a folding portion and a non-folding portion, a hinge assembly including a lever that rotates around a lever rotation axis, a link that rotates around a link rotation axis, and a roller that is fixedly attached to the link and moves along a slot, and a wing plate disposed between the display module and the hinge assembly rotates along the lever and contacts the roller.