Panel Speaker With Non-Adhesive Vibration Regions for Stereo Separation
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Solution Overview
Problem
Conventional panel speakers using multiple vibration actuators on a display panel often produce monaural sound instead of stereophonic sound due to cross-vibration interference between actuators, resulting in low left/right separation of sound channels.
Innovation Solution
A panel speaker design featuring a single vibration panel with non-adhesive regions between the panels and actuators, allowing independent control of each actuator to minimize cross-vibration interference, using adhesive regions to separate the actuators and enhance sound separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple vibration actuators are attached to a display panel to achieve stereophonic sound, then the sound output capability is improved, but cross-vibration interference occurs between actuators resulting in low left/right separation
Solution Approach 1:
The display panel is divided into multiple independent vibration regions through non-adhesive regions, where each region can vibrate independently without interfering with adjacent regions. This segmentation allows multiple vibration actuators to operate simultaneously with minimal cross-vibration interference, achieving both stereophonic sound output and high left/right separation.
Solution Approach 2:
Different regions of the display panel are given different adhesive properties: non-adhesive regions allow independent vibration for sound output, while adhesive regions provide structural support and prevent unwanted vibrations. This local differentiation of properties enables the panel to simultaneously achieve vibration independence for stereophonic sound and structural integrity for maintaining left/right separation.
2Strength
If a transmission panel is bonded to the back side of the display panel to form an integrated vibration panel, then the structural strength is improved, but the vibration independence of multiple actuators deteriorates
Solution Approach 1:
The bonding between the transmission panel and display panel is segmented into adhesive regions and non-adhesive regions. The non-adhesive regions correspond to the vibration regions where independent actuator operation is required, while the adhesive regions provide structural support. This segmented bonding approach maintains both structural strength and vibration independence.
Solution Approach 2:
The transmission panel exhibits different bonding characteristics in different regions: strongly bonded in adhesive regions for structural support, and unbonded in non-adhesive regions for vibration independence. This local differentiation allows the integrated panel structure to simultaneously provide strength and vibration independence for multiple actuators.
3Ease of manufacture
If the entire display panel is bonded to form a unified vibration panel, then the ease of manufacture is improved, but the device complexity increases due to the need for partitioning mechanisms
Solution Approach 1:
The bonding pattern is segmented into adhesive and non-adhesive regions directly in the panel structure, eliminating the need for additional partitioning mechanisms. The non-adhesive regions naturally define the vibration boundaries without requiring physical dividers or complex control systems, simplifying both manufacturing and device design.
Solution Approach 2:
The partitioning function is extracted from mechanical partitioning mechanisms and implemented through the adhesive pattern itself. The non-adhesive regions serve as natural vibration isolators, removing the need for additional partitioning structures and reducing device complexity while maintaining ease of manufacture.
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 design improves the quality of stereophonic sound output by increasing the left/right average vibration ratio, enhancing sound separation and simplifying the speaker structure without the need for additional partitioning mechanisms.
Implementation Method 1
a vibration actuator is attached to the back surface of the display panel (vibration panel). Thus, the vibration of the vibration actuator can be transmitted to the display panel
Implementation Method 2
The transmission panel is fixed to the display panel by a double-sided adhesive tape or the like
Data Source
AI summary
A panel speaker includes: a single vibration panel formed by adhering one surface of a first panel and one surface of a second panel; a first vibration actuator configured to drive and vibrate the single vibration panel; and a second vibration actuator configured to drive and vibrate the single vibration panel, the single vibration panel has, in a plan view, a first non-adhesive region and a second non-adhesive region in both of which the first panel and the second panel are not bonded to each other, and the first vibration actuator is coupled to other surface of the second panel to drive the first non-adhesive region, and the second vibration actuator is coupled to the other surface of the second panel to drive the second non-adhesive region.