Rollable Display Panel Bidirectional Winding Stress Dispersion

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Solution Overview

Problem

Conventional flat panel displays using glass substrates are limited by reduced flexibility, which restricts their applications and uses, especially when rolled, as continuous rolling in one direction can cause stress and hinder complete horizontal deployment.

Innovation Solution

A rollable display device featuring a flexible display panel wound alternately in both clockwise and counterclockwise directions using two rollers with adjustable winding speeds and diameters to disperse stress and maintain static characteristics, incorporating a driving motor and housing for controlled deployment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the display panel is wound in only one direction, then the winding mechanism is simple, but stress accumulates and static characteristics change

Engineering Contradiction:

Improvewinding mechanism complexityVSAvoidstatic characteristics stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The first roller winds the display panel alternately in first and second opposite directions in a periodic manner, creating alternating stress applications that prevent cumulative stress in one direction, thereby maintaining static characteristics while managing complexity

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system uses two rollers that can rotate in opposite directions to wind the display panel from both sides alternately, inverting the single-direction winding approach to achieve stress dispersion and maintain reliability

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If the display panel is wound in both directions alternately, then stress is dispersed and static characteristics are maintained, but the device complexity increases

Engineering Contradiction:

Improvestatic characteristics stabilityVSAvoidwinding mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The first and second rollers are integrated into a single housing and controlled by a unified driving motor, merging multiple winding functions into one coordinated system that reduces overall device complexity while maintaining bidirectional winding capability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The driving motor serves multiple functions by controlling both the first and second rollers to rotate in different directions, allowing one motor to perform the work of multiple motors and simplifying the device architecture

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Manufacturing precision

If glass substrates are used in flat panel displays, then manufacturing precision is high, but flexibility is reduced

Engineering Contradiction:

Improvedisplay panel manufacturing precisionVSAvoiddisplay panel flexibility

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The display panel uses a flexible substrate instead of traditional glass, enabling the panel to be wound around rollers and deployed in various configurations, thus achieving both flexibility and maintained manufacturing precision through advanced flexible display technologies

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentUS9625946B2Display device

Publication Date: 2017.04.18 SAMSUNG DISPLAY CO LTD

AI summary

Provided is a display device, including a flexible display panel; and a first roller connected to the display panel and having an outer surface, the first roller winding the flexible display panel on the outer surface, the first roller winding both in a first rotating direction and in a second rotating direction opposite to the first direction.