Speaker Assembly Grounding for Flexible Display Antenna Interference

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Solution Overview

Problem

Electronic devices with flexible displays face challenges in efficiently utilizing internal space due to the placement of components like speaker assemblies, which can lead to performance deterioration of antenna radiators due to parasitic resonance and electromagnetic interference.

Innovation Solution

A stacked structure is implemented where the speaker assembly is positioned between the printed circuit board and the support, with a case electrically connecting the PCB and the support, grounding the PCB to reduce parasitic resonance and interference, and a holder separates the speaker assembly from conductive portions to minimize electromagnetic interaction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the speaker assembly is disposed between the PCB and the support in a stacked structure, then the internal space is efficiently utilized, but the antenna radiator may experience parasitic resonance and electromagnetic interference

Engineering Contradiction:

Improveinternal space utilizationVSAvoidparasitic resonance and electromagnetic interference

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

A non-conductive holder is introduced as an intermediary component between the speaker assembly and the conductive portions (PCB and support). This holder physically separates the speaker assembly from the conductive elements, preventing electromagnetic coupling and parasitic resonance while allowing the stacked structure to maintain efficient space utilization. The holder acts as a mediator that blocks harmful electromagnetic fields from the speaker assembly from interacting with the antenna radiator.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If the case of the speaker assembly is made of metal material to provide structural support, then the structural strength is improved, but electromagnetic interference with the antenna radiator increases

Engineering Contradiction:

Improvestructural support strengthVSAvoidelectromagnetic interference

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The speaker assembly is segmented into distinct functional components: the metal case provides structural support, while the holder separates it from the conductive portions. This segmentation allows the metal case to fulfill its structural function without directly contacting the PCB and support, thereby preventing electromagnetic interference with the antenna radiator while maintaining structural integrity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The non-conductive holder serves as a mediator between the metal case of the speaker assembly and the conductive portions (PCB and support). This intermediary prevents electromagnetic fields from the metal case from coupling with the antenna radiator, thus reducing electromagnetic interference while allowing the metal case to provide necessary structural support.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If the PCB is grounded to the support to reduce parasitic resonance, then the electromagnetic interference is reduced, but the internal space arrangement becomes more complex

Engineering Contradiction:

Improveparasitic resonanceVSAvoidinternal space arrangement complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The grounding function is merged into the existing stacked structure by utilizing the holder as part of the assembly. The holder simultaneously serves as a structural component of the stacked arrangement and as the grounding path between the PCB and support. This merging approach achieves parasitic resonance reduction without adding separate grounding components that would increase structural complexity.

Inventive Principle:

Principle #5Merging (Combining)

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 configuration effectively reduces parasitic resonance, enhancing the radiation characteristics of the antenna radiator and improving the overall performance of wireless communication by efficiently using internal space and reducing electromagnetic interference.

Implementation Method 1

The case may electrically connect the PCB and the support

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

The holder may separate the case from the plurality of conductive portions

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Data Source

PatentUS20240431018A1Electronic device comprising ground structure using speaker assembly

Publication Date: 2024.12.26 SAMSUNG ELECTRONICS CO LTD

AI summary

An electronic device may include: a first housing; a second housing slidably coupled to the first housing; a flexible display including a display area that is reduced or expanded according to sliding-in or sliding-out of the second housing; a driving unit for driving the second housing; a support member disposed on the second housing and supporting at least a portion of the flexible display; a speaker assembly disposed on a surface of the support member, which is opposite to the surface of the support member facing the flexible display; and a printed circuit board disposed on a surface of the speaker assembly, which is opposite to the surface of the speaker assembly facing the flexible display. The speaker assembly may include a case electrically connecting the printed circuit board to the support member, and a speaker disposed in the case. Various other embodiments are also possible.