Display Device Dual Vibration Elements Phase Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices with vibration elements struggle to effectively manage vibrations to prevent sound leakage and ensure desired sound output, particularly in portable devices where space and vibration control are critical.
Innovation Solution
The display device incorporates a first vibration element attached to the display panel and a second vibration element disposed under the lower frame, with a phase-opposed or phase-same vibration signal configuration to manage vibrations and enhance sound output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single vibration element is used to generate sound, then the device structure is simple, but sound leakage occurs and sound pressure is insufficient
Solution Approach 1:
The single vibration element is divided into two separate vibration elements (first vibration element and second vibration element) positioned at different locations. This segmentation allows independent control of each element to manage sound propagation directions and reduce unwanted sound leakage while maintaining sufficient sound pressure output.
Solution Approach 2:
The second vibration element is configured to generate vibrations that counterbalance the vibrations from the first vibration element in specific directions. By controlling the phase and amplitude of each element, the system creates destructive interference for unwanted sound leakage while constructive interference enhances desired sound output.
2Object-generated harmful factors
If vibration elements are added to enhance sound output, then sound pressure increases, but the device complexity increases
Solution Approach 1:
The display panel serves multiple functions: it acts as both the display component and a vibration transmission surface for sound output. By utilizing the existing display panel structure for vibration transmission, the system enhances sound pressure without adding separate vibration transmission components, thereby limiting the increase in device complexity.
Solution Approach 2:
The first and second vibration elements are integrated into the existing device structure at different locations. The vibration control system combines the output of both elements to achieve enhanced sound pressure while utilizing shared control circuitry and integration with the display panel structure to manage overall device complexity.
3Ease of operation
If vibration elements are used for haptic feedback, then user experience improves, but control precision requirements increase
Solution Approach 1:
The system dynamically adjusts the phase and amplitude of each vibration element based on real-time requirements. By implementing dynamic phase control where the second vibration element can be configured with opposite phase to the first element, the system achieves precise haptic feedback control without requiring ultra-precise manufacturing tolerances, as the control system can compensate through active phase management.
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 effectively reduces unwanted vibrations and sound leakage, while enhancing the overall sound pressure and frequency range, providing a more comprehensive and controlled haptic feedback experience.
Implementation Method 1
an inverse piezoelectric effect principle of generating a displacement when applying a voltage to a piezoelectric element is used
Implementation Method 2
The vibration element is an element that converts electrical energy into mechanical vibration using an electromagnetic force generation principle
Data Source
AI summary
A display device includes a display panel displaying an image, a lower frame disposed under the display panel, a first vibration element attached to a lower surface of the display panel and which generates a first vibration based on a first vibration signal, a second vibration element disposed under the lower frame and which generates a second vibration based on a second vibration signal, and a first vibration driver circuit which provides the first vibration signal to the first vibration element, where a phase of the second vibration signal is opposite to a phase of the first vibration signal.