Rollable Display Cover Window Sliding Guide Mechanism

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Solution Overview

Problem

Flexible rollable display devices face stability issues due to stress applied to the cover window during shape changes, which can lead to breakage.

Innovation Solution

A rollable display device design that includes a housing with a winding roller and a sliding guide, where the cover window slides along the guide to reduce stress, and is attached to the display panel with an adhesive layer and magnetic attachment members, allowing the cover window to be bent within the housing without being wound around the roller.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the cover window is rigidly attached to the display panel, then structural stability is improved, but stress concentration during bending leads to breakage

Engineering Contradiction:

Improvestructural stabilityVSAvoidcover window durability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The attachment system is divided into two independent parts: a winding roller mechanism that handles the display panel and a sliding guide mechanism that handles the cover window. This segmentation allows each component to move independently, preventing stress concentration at the attachment interface while maintaining structural stability during bending and rolling operations.

Inventive Principle:

Principle #1Segmentation

2Strength

If the cover window is attached to the display panel, then structural integrity is improved, but stress applied during shape changes causes breakage

Engineering Contradiction:

Improvestructural integrityVSAvoidstress-induced breakage

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The sliding guide acts as an intermediary mechanism between the housing and the cover window. It provides a controlled path for the cover window to slide during bending, mediating the stress forces and distributing them along the sliding path rather than concentrating them at attachment points, thereby preventing stress-induced breakage while maintaining structural integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If the cover window moves with the display panel during rolling, then structural integrity is improved, but stress concentration occurs at the winding roller

Engineering Contradiction:

Improvestructural integrityVSAvoidstress concentration

Core Design Contradiction:

StrengthVSStress or pressure

Solution Approach 1:

The movement control is segmented into two independent systems: the winding roller that manages display panel rolling and the sliding guide that manages cover window movement. This segmentation ensures the cover window does not move with the display panel during rolling, eliminating stress concentration at the winding roller while maintaining structural integrity through the sliding mechanism.

Inventive Principle:

Principle #1Segmentation

4Reliability

If the cover window is allowed to bend independently, then stress reduction is improved, but attachment reliability deteriorates

Engineering Contradiction:

Improvestress reductionVSAvoidattachment reliability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The sliding guide serves as an intermediary attachment mechanism that enables independent cover window bending while maintaining attachment reliability. It provides a controlled sliding path that accommodates the cover window's independent movement during bending, reducing stress on the attachment while ensuring the cover window remains properly positioned and securely attached throughout the bending process.

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

This design effectively reduces stress on the cover window, preventing breakage and enhancing durability by allowing the cover window to move independently of the display panel, thus maintaining structural integrity during bending and rolling.

Implementation Method 1

an adhesive layer attaching the cover window to the display panel

Methodology Applied

Scientific EffectAdhesive bonding: Adhesive

Implementation Method 2

a first magnet and a second magnet respectively attached to the cover window at opposing sides of the cover window in a second direction crossing the first direction; and a first opposing body and a second opposing body attached to the display panel to face the first and second magnets, respectively, the first and second opposing bodies magnetically attractable to the first and second magnets

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentUS10203531B2Variable size display screen and display device including the same

Publication Date: 2019.02.12 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes: a display panel which displays an image with light; a cover window disposed on the display panel to form an outer display surface of the display device; a housing into which and out from the display panel and the cover window are together moved; and within the housing: a winding roller around which the display panel is wound and unwound within the housing, a first end of the display panel being connected to the winding roller; and a sliding guide along which the cover window slides to be bent within the housing, the sliding guide disposed outside the winding roller.