Display Panel Sound Generation Segmentation
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Solution Overview
Problem
Display devices face challenges in providing sufficient bass sound while minimizing panel displacement due to vibrations, which can affect visibility and mechanical reliability.
Innovation Solution
A display device design featuring a display panel with multiple sound generators, including a first sound generator for low-frequency sounds and second and third sound generators for high-frequency sounds, utilizing a bobbin, voice coil, and magnet for the first generator and piezoelectric elements for the others, along with blocking members to form an air duct for enhanced sound output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single sound generator is used to output low-pitched sound, then bass sound can be provided, but panel displacement increases reducing visibility and mechanical reliability
Solution Approach 1:
The sound generation function is segmented into multiple independent sound generators (first, second, and third sound generators) positioned at different locations on the display panel. Each generator handles specific frequency ranges, with the first generator dedicated to low-frequency bass sounds and the second and third generators handling high-frequency sounds. This segmentation distributes the mechanical stress and displacement across multiple components rather than concentrating it in a single generator, thereby maintaining bass output capability while reducing overall panel displacement and improving reliability.
2Reliability
If multiple sound generators are used to reduce panel displacement, then reliability improves, but device complexity increases
Solution Approach 1:
The display panel serves multiple functions: it acts as both the visual display surface and the vibration membrane for sound generation across all frequency ranges. The blocking members are designed to serve dual purposes: they structurally support the multiple sound generators while simultaneously forming air ducts that guide sound waves. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity despite the addition of multiple sound generators.
3Power
If blocking members are added to form air ducts, then sound wave propagation is optimized, but device complexity increases
Solution Approach 1:
The blocking members that form the air ducts are merged with the structural framework of the display device. The same blocking members that provide structural support and housing for the sound generators are simultaneously configured to create the air duct pathways. This merging of structural and acoustic functions allows sound wave propagation to be optimized without adding separate, dedicated air duct components, thereby minimizing the increase in device complexity.
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 effectively provides bass-enhanced stereo sound with reduced panel displacement, improving sound quality and reliability by optimizing sound wave propagation and panel vibration.
Implementation Method 1
a voice coil which surrounds the bobbin, and a magnet which surrounds the bobbin and spaced apart from the bobbin
Implementation Method 2
the vibration layer has a piezoelectric material that contracts or expands according to the first driving voltage applied to the first electrode and the second driving voltage applied to the second electrode
Data Source
AI summary
Provided is a display device. The display device includes a display panel including two long sides extending in a first direction and two short sides extending in a second direction, a first sound generator on a first area of one surface of the display panel, the first sound generator outputs a first sound by vibrating the display panel, a second sound generator on a second area of the one surface of the display panel, the second sound generator outputs a second by vibrating the display panel, a bottom frame on the one surface of the display panel, and a first blocking member between the one surface of the display panel and the bottom frame and along edges of the display panel, the first blocking member includes at least one opening.