Thin Display Speaker with Multi-Exciter Signal Processing
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Solution Overview
Problem
In the field of flat panel speakers, there is a demand for further improvement in sound quality, particularly as displays and speakers become thinner and lighter, and existing technologies struggle to effectively utilize display panels as diaphragms for enhanced audio performance.
Innovation Solution
A display apparatus and signal generation apparatus that incorporate a thin plate-like display cell with M exciters on its back surface, driven by a signal processor generating specific combinations of audio signals to optimize sound output, including attenuating low-frequency signals to prevent screen shaking and maintaining sound pressure balance across channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the display cell is made thinner and lighter to improve display quality, then the structural strength and rigidity deteriorate, causing screen shaking at low frequencies
Solution Approach 1:
The patent applies parameter changes by attenuating low-frequency signals (below a predetermined frequency) to prevent screen shaking. The signal processing unit modifies the frequency characteristics of audio signals to match the mechanical properties of the thin display cell, thereby resolving the contradiction between thinness and structural strength.
2Reliability
If multiple exciters are added to improve sound quality, then the audio performance improves, but the device complexity increases
Solution Approach 1:
The patent divides the audio frequency range into multiple bands and assigns different exciters to handle different frequency ranges. This segmentation allows each exciter to specialize in specific frequencies, improving overall sound quality while managing complexity through functional division.
Solution Approach 2:
The patent dynamically selects and combines signals from multiple exciters based on frequency content and volume levels. At low volumes, all exciters operate; at high volumes, low-frequency exciters are attenuated to prevent distortion, creating a dynamic adaptation strategy.
3Power
If high volume output is increased to improve audio performance, then the sound pressure increases, but screen shaking and distortion occur due to low-frequency vibrations
Solution Approach 1:
The patent converts the harmful low-frequency vibrations that cause screen shaking into a beneficial filtering strategy. By identifying the frequency range that causes distortion and systematically attenuating it, the system transforms a problematic characteristic into a controlled design parameter, enabling high-volume output without distortion.
4Adaptability or versatility
If the display panel is used as a diaphragm to integrate speaker functions, then the device integration improves, but the sound pressure balance across channels deteriorates
Solution Approach 1:
The patent applies local quality by assigning different exciters to different spatial locations on the display panel, with each exciter optimized for specific frequency ranges and directional characteristics. This allows the integrated display-speaker system to maintain sound pressure balance across channels by treating different regions of the panel with locally optimized excitation strategies.
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 enhances sound quality by suppressing low-frequency vibrations that cause screen shaking and maintains sound pressure balance, even at high volumes, thereby improving overall audio performance in thin and lightweight flat panel speakers.
Implementation Method 1
M exciters that are disposed on a back surface side of the display cell, and vibrate the display cell
Implementation Method 2
The driving section generates M kinds of first audio signals on the basis of an audio signal obtained from an external signal
Data Source
AI summary
A display apparatus according to an embodiment of the present disclosure includes: a thin plate-like display cell that displays an image; M exciters that are disposed on a back surface side of the display cell, and vibrate the display cell; and a driving section that drives the display cell and the M exciters.