Piezoelectric Haptic Substrate Resonance for Fast Vibration Response

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Solution Overview

Problem

Existing haptic feedback technologies using ERM and LRA motors struggle to achieve rapid vibration response times below the human perception threshold of 20 ms, leading to lag in user experience.

Innovation Solution

A driving method for a haptic feedback substrate utilizing a piezoelectric vibration unit, where a high-frequency AC signal is applied to resonate and a non-resonant high-frequency AC signal is used to quickly start and stop vibrations, respectively, to improve response speed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If ERM and LRA motors are used for haptic feedback, then the device can provide vibration feedback, but the response time exceeds the human perception threshold of 20 ms causing lag

Engineering Contradiction:

Improvevibration response speedVSAvoidresponse time delay

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The patent replaces traditional ERM and LRA motors with a piezoelectric vibration unit that utilizes the piezoelectric effect to generate vibrations. This substitution enables much faster response times by directly converting electrical signals to mechanical vibrations through the piezoelectric material, overcoming the inertia and mechanical delays inherent in motor-based systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs resonance frequency principles by applying a first AC signal at a frequency greater than the haptic feedback signal frequency to cause the piezoelectric vibration unit to resonate. This resonance mechanism enables rapid vibration initiation and termination, achieving response times below the human perception threshold of 20 ms.

Inventive Principle:

Principle #18Mechanical vibration

2Speed

If a high-frequency AC signal is applied to the piezoelectric vibration unit to resonate, then the vibration response speed is improved, but the complexity of the driving method increases

Engineering Contradiction:

Improvevibration response speedVSAvoiddriving method complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent uses periodic AC signals with specific frequency characteristics to control the piezoelectric vibration unit. By applying a first AC signal at a resonant frequency during the initial stage and a second AC signal at a non-resonant frequency during the terminal stage, the system achieves rapid vibration control through structured periodic signaling rather than complex control algorithms.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent changes the frequency parameter of the AC signal applied to the piezoelectric vibration unit to achieve different vibration states. By adjusting the frequency from resonant to non-resonant conditions, the system controls the vibration response speed and termination characteristics, simplifying the overall control approach through parameter modulation rather than system complexity.

Inventive Principle:

Principle #35Parameter changes

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 method enables the haptic feedback substrate to quickly initiate and terminate vibrations, enhancing user experience by avoiding lag in haptic responses.

Implementation Method 1

loading a first AC signal to a piezoelectric vibration unit of the haptic feedback substrate

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

the haptic feedback substrate being configured to resonate under an action of the first AC signal

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS20260016897A1Haptic feedback substrate and driving method therefor, and touch device

Publication Date: 2026.01.15 BEIJING BOE TECH DEV CO LTD

AI summary

A driving method for a haptic feedback substrate includes obtaining a haptic feedback signal required by a user; and driving the haptic feedback substrate to vibrate according to the haptic feedback signal. A first AC signal is loaded to a piezoelectric vibration unit of the haptic feedback substrate. A frequency of the first AC signal is greater than a frequency of the haptic feedback signal. The haptic feedback substrate is configured to resonate under an action of the first AC signal. At a stable vibration stage, the haptic feedback signal is loaded to the piezoelectric vibration unit. At a terminal vibration stage, a second AC signal is loaded to the piezoelectric vibration unit. A frequency of the second AC signal is a non-resonant frequency of the haptic feedback substrate. The frequency of the second AC signal is greater than the frequency of the haptic feedback signal.