Flexible Display Drive Mechanism for Flat Retractable Screens

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Solution Overview

Problem

Current retractable screen technologies face challenges in efficiently expanding and retracting flexible displays without causing visual distortions, such as bulging or swelling, due to limitations in torque transmission and mechanical stability.

Innovation Solution

A driving mechanism with a reduction gearbox structure and transmission assembly is implemented, which converts a low input torque into a higher output torque to drive the flexible display screen between expanded and retracted states, utilizing a sliding rail mechanism with elastic assemblies and guide rails to maintain screen flatness and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a direct drive mechanism is used to expand and retract the flexible display screen, then the device structure is simple, but the screen cannot be driven smoothly and may cause visual distortions due to insufficient torque control

Engineering Contradiction:

Improvestructure simplicityVSAvoidscreen flatness and stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

A reduction gearbox is introduced as an intermediary mechanism between the driving motor and the flexible display screen. The gearbox includes a first transmission member (drive shaft) connected to the motor and a second transmission member (driven shaft) connected to the screen, with gear teeth engaging between them to provide torque reduction and smooth motion transmission, preventing screen distortion while maintaining structural feasibility

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The reduction gearbox changes the torque parameter from the motor output by reducing speed and increasing torque through gear meshing. The gear ratio transforms the high-speed low-torque motor output into low-speed high-torque output suitable for driving the flexible display screen smoothly without causing visual distortions

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a reduction gearbox structure is added to improve torque transmission, then the screen can be driven smoothly without visual distortions, but the device complexity increases

Engineering Contradiction:

Improvescreen flatness and stabilityVSAvoidmechanical structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The transmission system is segmented into distinct functional components: the reduction gearbox for torque conversion, the first transmission member for power transmission, and the second transmission member for screen driving. This segmentation allows each component to be optimized independently while maintaining overall system reliability and manageable complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reduction gearbox serves multiple functions simultaneously: torque reduction, motion transmission, and motion control. By integrating these functions into a single mechanism, the overall device complexity is minimized while achieving reliable screen expansion and retraction without visual distortions

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If the flexible display screen is expanded and retracted frequently, then the user experience is improved, but power loss increases due to friction and mechanical resistance

Engineering Contradiction:

Improvescreen expansion and retractionVSAvoidpower loss

Core Design Contradiction:

Ease of operationVSLoss of energy

Solution Approach 1:

The traditional mechanical friction-based transmission is replaced with a magnetic field-based driving system. The driving assembly uses electromagnetic forces to act on the flexible display screen directly, eliminating mechanical contact and friction, thereby enabling frequent screen expansion and retraction operations with minimal energy loss

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 solution enables smooth and efficient expansion and retraction of flexible displays, preventing visual distortions and minimizing power loss, while ensuring the screen remains flat and stable throughout the process.

Implementation Method 1

the reduction gearbox structure converting the first torque into a second torque and outputting the second torque to the first transmission member

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Implementation Method 2

utilizing a sliding rail mechanism with elastic assemblies and guide rails to maintain screen flatness and stability

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11800661B2Driving mechanism and electronic device

Publication Date: 2023.10.24 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

A driving mechanism, includes a frame body, as well as a driving assembly and a transmission assembly mounted on the frame body; the driving assembly including a driving member and a reduction gearbox structure connected together and mounted to the frame body; the transmission assembly including a first transmission member and a second transmission member, the first transmission member being mounted to the frame body and connected to the reduction gearbox structure, the second transmission member being in transmission connection with a flexible display screen. The driving member outputs a first torque to be converted into a second torque, and the second torque is output to the first transmission member, to drive the flexible display screen to move, wherein the first torque is less than the second torque.