Under-Panel Dual Actuators for Display Audio and Haptic Feedback
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Solution Overview
Problem
Existing display devices face challenges in providing both sound output and haptic feedback without compromising the display area, as they often require a front speaker that occupies valuable space.
Innovation Solution
The display device incorporates two sound generating devices, a piezoelectric actuator for high frequencies and a linear resonant actuator for low frequencies, positioned beneath the display panel, allowing for sound generation and haptic feedback without a front speaker, thus increasing the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a front speaker is provided on the display device, then sound output quality is improved, but the display area is reduced
Solution Approach 1:
The patent moves the speaker from the front surface (2D plane) to the back surface of the display panel, utilizing the third dimension (thickness direction) to resolve the space conflict. This allows the display area on the front surface to be maximized while sound generation functions are maintained on the back surface through vibration of the display panel.
2Area of stationary object
If sound generating devices are integrated beneath the display panel, then display area is increased, but sound pressure level may be reduced
Solution Approach 1:
The display panel serves dual functions: as the visual display surface and as the sound generation membrane. By utilizing the display panel itself for sound generation through vibration, the system eliminates the need for separate front-facing speakers while maintaining sound output capability, thereby maximizing display area without significant loss in sound pressure level.
3Adaptability or versatility
If haptic feedback is added to sound generation functions, then user interaction capability is improved, but device complexity increases
Solution Approach 1:
The same sound generating devices (first and second speakers) are used for both sound output and haptic feedback functions. The display panel vibrates to provide both audio output and tactile feedback, eliminating the need for separate haptic actuator components and reducing overall device complexity while enhancing user interaction capabilities.
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 high-quality sound output across frequency ranges and provides haptic feedback while maximizing the display area by eliminating the need for a front speaker.
Implementation Method 1
the first sound generating device includes a piezoelectric actuator
Implementation Method 2
the second sound generating device includes an actuator by pressing a mass connected to a spring via a voice coil
Implementation Method 3
an actuator by pressing a mass connected to a spring via a voice coil
Data Source
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AI summary
A display device including: a display panel; and first and second sound generating device configured to generating sounds and vibrate the display panel, wherein the first sound generating device may have a higher sound pressure level than the second sound generating device in a first frequency range, and the second sound generating device may have a higher sound pressure level than the first sound generating device in a second frequency range lower than the first frequency range. A method of driving a display device in sound generating and haptic modes also is disclosed.