Panel Vibration Actuator for Bidirectional Sound in Dual Displays
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Solution Overview
Problem
Conventional display devices with integrated speakers face challenges in sound quality and immersion due to rear sound emission, interference, and spatial constraints, especially in double-faced display devices that require sound output in opposite directions.
Innovation Solution
A panel vibration type sound generating actuator that directly vibrates two display panels in a double-faced display device, using a single bobbin with bidirectional movement, a plate with a through-hole, and magnets to minimize space and improve sound localization, eliminating the need for separate speakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate speaker is disposed at the rear or lower part of a display panel, then sound can be generated, but the sound progresses toward the rear side or underside rather than toward the viewer, disturbing the immersive experience
Solution Approach 1:
The patent combines the sound generation function with the display panel itself by making the display panel vibrate directly to produce sound. The display panel serves dual purposes: displaying images and generating sound, eliminating the need for separate speakers and ensuring sound progresses toward the viewer for an immersive experience
Solution Approach 2:
The display panel is designed to perform multiple functions simultaneously - it acts as both the image display surface and the sound generation element. By applying vibration to the display panel, it becomes a universal component that provides both visual and auditory output toward the viewer
2Adaptability or versatility
If two or more speakers are arranged in opposite directions for a double-faced display device, then sound can be output in opposite directions, but the sounds may overlap or interfere with each other to degrade the sound transfer characteristic
Solution Approach 1:
Instead of using two separate speakers that may interfere with each other, the patent uses a single sound generation actuator that simultaneously vibrates both display panels in opposite directions. This unified approach eliminates sound interference while maintaining the capability to output sound in opposite directions
Solution Approach 2:
A single actuator performs the function of driving both display panels, making it a multi-functional component that enables bidirectional sound output without the interference problems associated with multiple separate speakers
3Ease of manufacture
If conventional speakers are used in display devices, then sound generation is achieved, but the speakers occupy a predetermined space and impose restrictions on design and spatial arrangement
Solution Approach 1:
The sound generation function is merged with the display panel structure itself. The display panel becomes the sound-generating element through direct vibration, eliminating the need for separate speaker components and the space they would occupy
Solution Approach 2:
The separate speaker component is extracted from the system entirely. By making the display panel itself the sound generation element, the patent removes the need for dedicated speaker space, freeing up design and spatial arrangement options
4Volume of moving object
If a single sound generating actuator is used to vibrate two display panels, then space is minimized, but the display panels need to be vibrated in opposite directions requiring bidirectional movement
Solution Approach 1:
The actuator design uses asymmetric magnet arrangements and bobbin configurations to enable bidirectional movement. By strategically placing magnets and designing the bobbin structure, the system achieves opposite-direction vibration of both display panels through a single actuator without requiring complex mechanical mechanisms
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
Enhances sound quality and localization in double-faced display devices by directly vibrating both display panels, reducing thickness and space occupation while minimizing sound pressure reduction due to phase differences.
Implementation Method 1
at least one magnet, wherein a coil is wound around an outside of the bobbin
Data Source
AI summary
The present embodiment relates to a double-faced display device generating sound by directly vibrating a display panel and includes: a first display panel and a second display panel disposed at the front and rear surface thereof, respectively; a single sound generating actuator connected to the first display panel and the second display panel to simultaneously vibrate the first display panel and the second display panel and thus generate sound; and a support part configured to support the sound generating actuator, the first display panel, and the second display panel. The present embodiment does not require a separate speaker and thus can achieve a thin or slim display device, and can improve the localization or the quality of sound output in opposite directions in the double-faced display device.