Display Panel Sound Generation Using Harmonic Tone Simulation
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Solution Overview
Problem
Small display devices face challenges in producing low-frequency sounds due to limited space, making it difficult to increase the cross-sectional area of sound generators, while larger devices can produce low-frequency sounds but often result in visible panel vibrations, which are undesirable.
Innovation Solution
A display device with a first and second sound generator on its surface, along with a sound driver circuit that generates specific sound signals to produce low-frequency sounds without increasing the sound generator area, and uses harmonic tones to simulate the fundamental tone, reducing the need for larger sound generators and minimizing panel vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the cross-sectional area of the sound generator is increased to increase vibration displacement for low-frequency sound output, then the low-frequency sound output capability is improved, but the device size increases
Solution Approach 1:
The patent changes the driving parameters by applying different frequency signals (first frequency for first sound generator, second frequency higher than first for second sound generator) to create harmonic tones that simulate the fundamental tone, enabling low-frequency sound perception without increasing sound generator area
Solution Approach 2:
The patent uses harmonic tones (second sound) to copy or simulate the effect of the fundamental tone (first sound), allowing the perception of low-frequency sound without physically producing the fundamental frequency, thus avoiding the need for large sound generators
2Object-generated harmful factors
If the cross-sectional area of the sound generator is increased to increase vibration displacement, then the low-frequency sound output capability is improved, but the device complexity increases
Solution Approach 1:
The patent makes the display panel serve multiple functions: both as the display surface and as the vibration surface for sound generation, eliminating the need for separate sound generator structures and reducing device complexity
Solution Approach 2:
The patent merges the display panel and sound generation function into a single integrated structure, where the display panel itself vibrates to produce sound, thereby simplifying the overall device structure
3Object-generated harmful factors
If the display panel vibration is increased to output low-frequency sound in middle- or large-sized devices, then the low-frequency sound output capability is improved, but the visual recognition of panel vibration by users occurs
Solution Approach 1:
The patent uses mechanical vibration of the display panel at specific frequencies (first and second frequencies) to generate sound, controlling the vibration characteristics to produce audible low-frequency sound while minimizing visible vibration through the use of harmonic frequencies that are less perceptible visually
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
Enables the perception of low-frequency sounds in small devices without increasing sound generator size and minimizes visible vibrations in larger devices, providing high-quality sound output.
Implementation Method 1
a first sound generator which is disposed on a surface of the first substrate and vibrates the display panel according to a first sound signal to output a first sound
Implementation Method 2
a second sound generator which is disposed on the surface of the first substrate and vibrates the display panel according to a second sound signal to generate a second sound in a higher frequency range than the first sound
Data Source
AI summary
A display device includes a display panel which includes a first substrate, a second substrate, and a light emitting element layer disposed between the first substrate and the second substrate and outputting light to the second substrate, a first sound generator which is disposed on a surface of the first substrate and outputs sound by vibrating the display panel, and a first buffer member which is disposed on the surface of the first substrate, where a height of the first buffer member is smaller than that of the first sound generator.