Acoustically Transparent Display Perforations
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Solution Overview
Problem
Conventional acoustically transparent displays with rigid electronic boards struggle to maintain angle-independent acoustic signal distribution when loudspeakers are placed behind the screen, leading to energy loss and audio quality degradation due to diffraction and reflection issues.
Innovation Solution
The system incorporates a light emitting display with perforations extending perpendicularly to the display surface, featuring non-cylindrical shapes such as truncated cones or conical openings that occupy at least 5% of the display area, allowing for optimal acoustic signal transmission and reducing reflections, with loudspeakers positioned immediately behind the display to ensure consistent sound distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rigid electronic board structure is used for the display screen, then manufacturing precision and structural stability are improved, but acoustic signal transmission quality deteriorates due to diffraction and reflection caused by the rigid structure
Solution Approach 1:
The display screen incorporates a perforated structure with multiple openings distributed across the surface. These perforations allow acoustic signals to pass through the display screen more efficiently, reducing diffraction and reflection effects caused by a completely solid rigid structure. The porous/perforated design maintains structural stability while improving acoustic transparency.
2Length of stationary object
If the loudspeaker is placed far behind the display screen, then space allocation is improved, but acoustic signal quality deteriorates due to energy diffraction and reflection towards the room behind the screen
Solution Approach 1:
The invention optimizes the placement of the loudspeaker in the spatial dimension, positioning it at a specific distance behind the display screen. This optimal positioning ensures that acoustic signals travel through the perforations at angles that minimize diffraction and reflection towards the rear room, while still maintaining adequate space allocation. The solution transforms a one-dimensional space problem into an optimized three-dimensional spatial arrangement.
3Productivity
If the loudspeaker is placed immediately behind the display screen, then acoustic signal transmission efficiency is improved, but space allocation deteriorates due to limited space next to the display
Solution Approach 1:
The display screen acts as a thin film structure with perforations that allows the loudspeaker to be positioned immediately behind it. The thin film nature of the display screen enables close proximity placement of the loudspeaker without requiring substantial space, while the perforations ensure efficient acoustic signal transmission. This resolves the conflict between transmission efficiency and space allocation.
4Reliability
If perforations with large open area are used, then acoustic signal transmission is improved, but display visual quality deteriorates due to reduced light emission area
Solution Approach 1:
The perforations are strategically positioned in specific local areas of the display screen, particularly in regions where they do not interfere with the primary light emission zones. This local quality approach ensures that acoustic transmission is optimized in specific areas while maintaining visual quality in other areas. The perforations are distributed to balance acoustic transparency with light emission effectiveness.
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 enhances sound reproduction and distribution, maintaining high audio quality across a wider audience area while minimizing energy loss and reflections, achieving an acoustic transparency index comparable to cinema projection screens.
Implementation Method 1
The system can be configured to enable an optimal route for the acoustic signal to pass the display screen
Implementation Method 2
The perforations can have a truncated cone shape. This has the advantage of reducing should reflection at the back of the display
Implementation Method 3
Loudspeakers can be designed to provide a lambertian radiation distribution of the acoustic signal. This is an angle independent distribution which can avoid that the acoustic signal has high quality in only a very limited area
Implementation Method 4
If the loudspeaker is placed too far behind the display screen, a remarkable amount of energy will be diffracted and/or reflected towards the room behind the screen
Data Source
AI summary
A system and method for providing visual and acoustical signals that includes a light emitting display having light sources and a display surface, and perforations extending perpendicularly to the display surface and disposed between the light sources, at least one loudspeaker positioned behind the light emitting display. The perforations have a non-cylindrical shape. The openings on the side of the light sources occupies at least 5% of the area of the light emitting display for sound passing through.