Panel Speaker Stiffening Structure for Audio Leakage
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Solution Overview
Problem
Conventional mobile devices with panel speakers suffer from narrow band call quality issues and 'dead band' areas on the front display, resulting in inadequate audio signal output and privacy concerns due to audio signal leakage.
Innovation Solution
The implementation of a panel speaker system using a stiffened chassis with ribs and a piezoelectric actuator, combined with echo cancellation tape, to enhance acoustic performance by directing audio signals effectively and minimizing leakage, while maintaining user privacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional speaker technology is used in mobile devices, then the device structure is simple, but the audio signal output is narrow band and inadequate
Solution Approach 1:
The patent combines the display module with the speaker function by making the display module itself vibrate to produce audio signals. The stiffening structure integrates the chassis, display support, and acoustic waveguides into a unified system where the display module serves dual purposes as both visual output and acoustic radiation surface.
Solution Approach 2:
The patent transitions from conventional point-source speakers to a surface-area-based acoustic system. The entire display module surface becomes an acoustic radiating surface, utilizing the two-dimensional area of the display to propagate sound waves in multiple directions simultaneously, thereby expanding the effective acoustic output area.
2Adaptability or versatility
If panel speakers are used behind the front display, then the device integrates speaker and display, but dead band areas are created on the front display
Solution Approach 1:
The stiffening structure includes multiple acoustic waveguides that segment and distribute acoustic energy to different regions of the display module. This segmentation ensures that audio signals are propagated uniformly across the entire display surface, eliminating dead band areas where no sound would be produced.
Solution Approach 2:
The acoustic waveguides act as intermediary structures that transfer vibrations from the actuator to various regions of the display module. These waveguides mediate the distribution of acoustic energy, ensuring uniform sound propagation across the display surface and preventing dead zones.
3Manufacturing precision
If the display module vibrates to produce audio signals, then wide band sound output is achieved, but audio signal leakage may occur
Solution Approach 1:
The stiffening structure incorporates localized acoustic waveguides and damping materials in specific regions to control sound propagation paths. Different portions of the structure have different acoustic properties - some regions guide sound forward, others dampen backward radiation, creating localized acoustic zones that prevent unwanted leakage.
4Manufacturing precision
If a stiffening structure with ribs is added to the chassis, then acoustic performance is improved, but device complexity increases
Solution Approach 1:
The stiffening ribs are designed to serve multiple functions simultaneously: they provide structural reinforcement to the chassis, act as acoustic waveguides to distribute sound waves, and serve as mounting structures for the display module. This multi-functionality reduces the need for separate components, thereby limiting the increase in overall device complexity.
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 solution provides improved wide band sound output, reduced echo issues, and enhanced user privacy by effectively transmitting audio signals through a vibrating display module without compromising sound quality or increasing noise radiation.
Implementation Method 1
an actuator located in the first portion adjacent to the at least one wall; and a movable section configured to be actuated by the actuator
Data Source
AI summary
An apparatus includes a first portion configured to carry one or more components of the apparatus and at least one wall extending between two or more sides of the first portion; an actuator located in the first portion adjacent to the at least one wall; and a movable section on the first portion and configured to be actuated by the actuator. At least the first portion and the movable section define a speaker.