Vibration Apparatus for Display Panel Sound Reproduction
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Solution Overview
Problem
Display apparatuses face challenges in providing effective sound reproduction due to the thickness and fragility of piezoelectric elements, which limit their application in thin and flexible displays, and struggle to output stereo sound while maintaining sound pressure level characteristics.
Innovation Solution
A vibration apparatus is integrated at the rear surface of a display panel, utilizing a supporting member with a first and second member to enhance sound quality and sound pressure level characteristics, particularly for low-pitched sound bands, by vibrating the display panel to generate sound in a forward direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If piezoelectric elements are used to generate sound, then the display apparatus can be made thin, but the reliability is reduced due to fragility
Solution Approach 1:
The patent changes the material parameter from fragile piezoelectric elements to flexible piezoelectric composite material that maintains thinness while improving durability and reliability through compositional modification
Solution Approach 2:
The patent uses piezoelectric composite material combining flexible substrate with piezoelectric particles, creating a composite structure that achieves both thinness and enhanced reliability compared to traditional piezoelectric elements
2Device complexity
If a single vibration apparatus is used, then the structure is simple, but stereo sound reproduction and sound pressure level characteristics are insufficient
Solution Approach 1:
The patent divides the vibration apparatus into multiple independent units (first and second vibration apparatuses) with different vibration directions, enabling stereo sound reproduction while maintaining overall structural simplicity
Solution Approach 2:
The patent makes the display panel serve multiple functions: both as the display surface and as the vibration member for sound reproduction, eliminating the need for separate speaker components
3Length of stationary object
If piezoelectric elements are used, then thinness is achieved, but damage occurs due to fragile characteristic
Solution Approach 1:
The patent employs piezoelectric composite material with flexible substrate and piezoelectric particles, creating a structure that maintains thinness while significantly improving strength and damage resistance
Solution Approach 2:
The patent modifies the mechanical properties by changing from brittle piezoelectric ceramic to flexible piezoelectric composite, achieving both thinness and enhanced strength
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 solution enables improved sound reproduction with enhanced sound pressure level and localization, addressing the limitations of traditional piezoelectric elements by effectively vibrating the display panel to produce high-quality sound, including stereo sound, without increasing the thickness of the display apparatus.
Implementation Method 1
a vibration apparatus disposed at a rear surface of the display panel and configured to vibrate the display panel
Implementation Method 2
piezoelectric elements that enable thinness to be implemented
Data Source
AI summary
An apparatus comprises a display panel configured to display an image, a vibration apparatus disposed at a rear surface of the display panel and configured to vibrate the display panel, a supporting member disposed at the rear surface of the display panel and including a first member and a second member, and the first member and the second member are disposed on a same surface as the supporting member.