Rollable Display Grounding Continuity via Movable Contact

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Solution Overview

Problem

Conventional rollable display devices face challenges with electromagnetic interference (EMI) due to discontinuity in grounding, particularly in printed circuit boards, leading to increased costs from using EMI materials and difficulties in maintaining contact during roller rotation.

Innovation Solution

Incorporating a movable grounding unit inside the roller and an additional grounding unit under the roller, which contacts the roller support unit upon unwinding, ensures continuity and enhanced grounding, minimizing EMI through improved contact mechanisms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a fixed grounding unit is used in the roller support unit, then grounding is provided during winding, but grounding contact is lost during unwinding

Engineering Contradiction:

Improvegrounding continuityVSAvoidroller rotation contact maintenance

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The grounding unit is designed to move dynamically between a first position (contacting the roller support unit during winding) and a second position (contacting the roller during unwinding). This dynamic repositioning ensures continuous grounding contact is maintained throughout the roller's rotation cycle, resolving the contradiction between maintaining grounding reliability and ease of operation during roller rotation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

A movable grounding unit acts as an intermediary between the roller support unit and the roller, adapting its position based on the roller's rotational state. This intermediary component ensures continuous electrical connection is maintained regardless of whether the roller is in winding or unwinding phase, solving the contact maintenance problem.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If EMI materials are used to reduce electromagnetic interference, then EMI performance is improved, but device cost increases

Engineering Contradiction:

Improveelectromagnetic interferenceVSAvoidcost

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent replaces complex EMI shielding materials with a simpler mechanical grounding system. By ensuring continuous electrical connection through the movable grounding unit that adapts to the roller's position, the system achieves EMI reduction through proper grounding rather than requiring expensive EMI-blocking materials, thus reducing device complexity and cost.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention uses a simple, cost-effective grounding mechanism instead of expensive EMI materials. The movable grounding unit provides adequate EMI protection through proper electrical connection without requiring costly shielding components, achieving the same protective effect at lower cost.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS11589486B2Display device

Publication Date: 2023.02.21 LG DISPLAY CO LTD

AI summary

A display device includes a display part including a display panel in which a plurality of pixels is defined, a roller fastened with the display part and configured to wind or unwind the display part, a roller support unit configured to support the roller at both sides of the roller, and a first grounding unit including a body accommodated inside the roller so as to be movable and a contact portion connected to an outer surface of the body and brought into contact with the roller support unit as the body moves, thus maintaining and enhancing continuity of grounding and maximizing the effect of improving EMI.