Display-Adjacent Speaker Pairing for EMI-Canceling Audio Output

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Solution Overview

Problem

Integrating audio transducers such as speakers into compact electronic devices is challenging due to limited space and the potential for electromagnetic interference with display components.

Innovation Solution

Implementing a speaker system with two speakers mounted adjacent to a data line of the display, operating acoustically and mechanically in phase but electrically out of phase, using reversed magnetic polarity and opposite current directions to mitigate electromagnetic interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If speakers are integrated into compact electronic devices, then audio output capability is improved, but electromagnetic interference with display components increases

Engineering Contradiction:

Improveaudio output capabilityVSAvoidelectromagnetic interference with display

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies the principle of converting harmful electromagnetic interference into a beneficial effect by using differential signaling. Two speakers are driven with opposite polarity signals, causing their electromagnetic fields to cancel each other out near the display data lines. This transforms the harmful electromagnetic radiation into a neutral or beneficial interference-cancellation mechanism, allowing audio output capability to be improved without compromising display functionality.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent implements preliminary anti-action by pre-configuring the speaker system to generate counteracting electromagnetic fields before interference occurs. The differential drive circuitry is designed to output signals with opposite polarities to adjacent speakers, creating electromagnetic fields that naturally cancel each other's interference effects on display data lines before the interference can affect display operation.

Inventive Principle:

Principle #9Preliminary anti-action

2Area of stationary object

If speakers are mounted adjacent to display data lines, then space utilization is improved, but electromagnetic interference with data lines increases

Engineering Contradiction:

Improvespace utilizationVSAvoidelectromagnetic interference with data lines

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful electromagnetic interference that would normally result from mounting speakers adjacent to display data lines into a beneficial effect. By driving adjacent speakers with opposite polarity signals, the electromagnetic fields generated by the speakers cancel each other out in the region of the data lines, transforming potential interference into a shielding effect that protects display operation while maximizing space utilization.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent applies asymmetry by introducing opposite polarity configurations for adjacent speakers. Rather than treating all speakers symmetrically with identical drive signals, the system deliberately creates asymmetric electromagnetic field patterns through differential signaling, where adjacent speakers generate fields of equal magnitude but opposite direction, resulting in cancellation at the display data lines.

Inventive Principle:

Principle #4Asymmetry

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

Effectively cancels electromagnetic interference with display data lines, allowing for efficient audio output while maintaining display functionality in compact electronic devices.

Implementation Method 1

a first speaker and a second speaker that are both mounted adjacent to a data line of the display... operate acoustically and mechanically in phase, while being electrically out of phase

Methodology Applied

Scientific EffectElectromagnetic interference: Electromagnetic Induction

Implementation Method 2

using reversed magnetic polarity and opposite current directions to mitigate electromagnetic interference

Methodology Applied

Scientific EffectElectromagnetic field cancellation: Electromagnetic Induction

Data Source

PatentUS12495233B2Audio transducer systems for electronic devices with displays

Publication Date: 2025.12.09 APPLE INC

AI summary

Aspects of the subject technology relate to electronic devices having speakers. An electronic device may operate a pair of speakers to in a way that mitigates electromagnetic interference with a display of the electronic device. For example, the speakers may be operated acoustically and mechanically in phase, and electrically out of phase, to mitigates interference with a display of the electronic device.