Piezoelectric Touch Panel Vibration Uniformity via Dual-Surface Actuation
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Solution Overview
Problem
Existing touch panel devices using multiple piezoelectric elements for vibration feedback face interference issues, leading to reduced vibration at the center, complicating circuit configurations when trying to suppress these interferences.
Innovation Solution
A display input device with piezoelectric elements disposed on both the front and back surfaces of the touch panel, driven by a simple configuration that applies the same voltage waveform to all elements, ensuring uniform vibration distribution without interference, using elastic members to maintain the touch panel in a curved state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple piezoelectric elements are disposed on one surface of the touch panel, then the touch panel can be vibrated to provide tactile feedback, but vibration interference occurs causing reduced vibration at the center
Solution Approach 1:
The patent applies dimensionality change by disposing piezoelectric elements on both the front surface and back surface of the touch panel, transitioning from a single-surface arrangement to a dual-surface configuration. This spatial redistribution allows vibration sources to be positioned at different locations relative to the panel center, preventing constructive and destructive interference patterns that occur when all elements are on one surface. The result is more uniform vibration distribution across the touch panel surface.
2Reliability
If different voltage waveforms are input to respective piezoelectric elements to suppress vibration interference, then vibration uniformity is improved, but circuit configuration and processing become complicated
Solution Approach 1:
The patent applies homogeneity by inputting the same voltage waveform to all piezoelectric elements simultaneously, treating all elements uniformly rather than applying different waveforms to different elements. This simplified control approach, combined with the dual-surface spatial arrangement, achieves vibration uniformity without requiring complex differential waveform generation and control circuits.
3Reliability
If piezoelectric elements are disposed on both front and back surfaces, then vibration interference is suppressed and uniformity is improved, but device structure becomes more complex
Solution Approach 1:
The patent applies multi-functionality by having the touch panel serve dual purposes: as the display interface and as the vibration transmission medium. The piezoelectric elements on both surfaces vibrate the touch panel itself, eliminating the need for separate vibration transmission structures. This integrates the vibration function into the existing touch panel structure, reducing overall device complexity despite the dual-surface element arrangement.
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 suppresses vibration reduction at the center, providing a consistent tactile feedback to users across the touch panel with a simplified circuit structure.
Implementation Method 1
a plurality of piezoelectric elements 651 to 656, and a drive portion 64. The plurality of piezoelectric elements 651 to 656 are provided in a divided manner on a front surface and a back surface of the touch panel 63. The drive portion 64 drives the piezoelectric elements 651 to 656 in accordance with a touch operation on the touch panel 63, thereby to vibrate the touch panel 63.
Data Source
AI summary
In order to suppress reduction in vibration due to interference by use of a simple structure, a display input device (6) includes: a display portion (62); a touch panel (63) that is provided on an upper surface of the display portion (62) and detects a position of a touch operation; a plurality of piezoelectric elements (651 to 656) provided in a divided manner on a front surface and a back surface of the touch panel (63); and a drive portion (64) that drives the piezoelectric elements (651 to 656) in accordance with a touch operation on the touch panel (63), thereby to vibrate the touch panel (63).