Piezoelectric Haptic Module Electrode Geometry for Low-Frequency Vibration
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Solution Overview
Problem
Current touch panel technologies increase mass to reduce vibration frequency, resulting in higher overall weight and contradicting the goal of lightweight, thin screens, while also complicating production processes.
Innovation Solution
A haptic feedback module comprising a touch panel and a piezoelectric haptic feedback module with a soft circuit board and piezoelectric units, where the first electrode areas are 10-20% the length of the piezoelectric units, allowing for resonance frequencies below 500 Hz without additional mass, enabling perceivable vibrations by the human body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mass of vibration units is increased to reduce vibration frequency, then the perception frequency is improved, but the overall weight of the touch panel increases
Solution Approach 1:
The patent changes the physical parameters of the piezoelectric units, specifically making their length significantly larger than the electrode areas (10-20% ratio). This parameter change allows the piezoelectric units to function as vibration elements with appropriate resonance frequencies without requiring additional mass, thereby achieving human-perceptible vibrations while maintaining lightweight design
Solution Approach 2:
The patent replaces traditional mechanical vibration systems with piezoelectric units that convert electrical energy directly to mechanical vibrations. This substitution eliminates the need for heavy mechanical vibration components while achieving the desired vibration frequencies through the piezoelectric effect and careful dimensional design
2Measurement precision
If the mass of vibration units is increased to reduce vibration frequency, then the perception frequency is improved, but the production processes become more complex
Solution Approach 1:
The patent merges the functions of electrode structures and vibration elements into a unified design where the piezoelectric units are directly positioned below the electrode areas. This integration eliminates the need for separate vibration components and simplifies the production process while achieving the required vibration frequencies through the dimensional relationship between electrode areas and piezoelectric units
3Measurement precision
If additional mass is added to reduce resonance frequency, then the vibration frequency becomes perceivable, but the touch panel no longer achieves light and thin design
Solution Approach 1:
The patent achieves the required vibration frequency by changing the dimensional parameters of existing components - specifically making the piezoelectric units significantly longer than the electrode areas (10-20% ratio). This allows resonance frequency reduction without adding mass or thickness, maintaining the light and thin design while achieving human-perceptible vibrations
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 effectively reduces resonance frequency to a range perceivable by humans without increasing mass, aligning with the goal of lightweight touch screens and simplifying production processes.
Implementation Method 1
each piezoelectric unit comprises a piezoelectric component
Implementation Method 2
the resonance frequency can be reduced to the range of vibration frequency perceptible to the human body
Data Source
AI summary
A haptic feedback module with a touch panel and a piezoelectric haptic feedback module is disclosed. The piezoelectric haptic feedback module contacts with the touch panel and has a first soft circuit board and a plurality of piezoelectric units. The first soft circuit board has a plurality of first electrode areas and each first electrode area has a first length. Each of the piezoelectric units is respectively configured below each of the first electrode areas. Each of the piezoelectric units has a second length, wherein the first length is 10% to 20% of the second length.