Panel Speaker Strip Adhesive Reduces Vibration Resistance
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Solution Overview
Problem
The sound quality of the output sound from display speakers is compromised due to variations in sound pressure at different frequencies, which are affected by the region where the double-sided adhesive tape is attached to the display panel.
Innovation Solution
A panel speaker configuration is introduced, where a first panel and a second panel are adhered using a first adhesive layer with strip-shaped regions, and the second panel is coupled with a vibration actuator through a second adhesive layer, positioned between adjacent strip-shaped regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a double-sided adhesive tape is used to fix the transmission panel to the display panel, then the panels are securely bonded, but the sound quality deteriorates due to vibration resistance and sound pressure variations
Solution Approach 1:
The adhesive layer is divided into multiple strip-shaped regions arranged in parallel, creating separate bonding zones. This segmentation allows the panels to vibrate more freely between the strips while maintaining secure bonding at the strip locations, thereby improving sound quality without sacrificing bonding strength
Solution Approach 2:
The adhesive layer has different properties in different regions: the strip-shaped regions provide strong bonding, while the regions between strips allow vibration. This local differentiation of adhesive properties enables simultaneous achievement of secure bonding and improved sound quality
2Strength
If the adhesive layer covers the entire contact area, then maximum bonding strength is achieved, but vibration resistance increases and sound quality deteriorates
Solution Approach 1:
The continuous adhesive layer is segmented into discrete strip-shaped regions, reducing the total adhesive contact area. This allows the panels to vibrate more freely in the non-adhesive regions while maintaining sufficient bonding strength at the strip locations
Solution Approach 2:
The strip-shaped adhesive regions act as intermediaries that provide localized bonding while allowing vibration transmission in the gaps between strips, mediating between the conflicting requirements of bonding strength and vibration freedom
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 improves the sound quality of the output sound by reducing vibration resistance and allowing for more efficient vibration of the display panel, resulting in higher sound pressure across various frequency ranges.
Implementation Method 1
a vibration actuator configured to vibrate the first panel and the second panel
Implementation Method 2
an adhesive layer configured to adhere one surface of the first panel to one surface of the second panel
Data Source
AI summary
A panel speaker includes: a first panel; a second panel; a vibration actuator configured to vibrate the first panel and the second panel; an adhesive layer configured to adhere one surface of the first panel to one surface of the second panel; and a coupling portion configured to couple other surface of the second panel with the vibration actuator, the adhesive layer includes a plurality of strip-shaped regions parallel to one direction in a plan view of the second panel, and the coupling portion is disposed at a region sandwiched between adjacent two of the plurality of strip-shaped regions in the plan view of the second panel.