Display Panel Haptic Feedback Noise Reduction

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Solution Overview

Problem

Haptic feedback technologies in display devices generate noise that can cause user confusion and discomfort, with noise levels varying by touch location and actuator configuration, necessitating a method to minimize and uniformize noise radiation.

Innovation Solution

A method involving a display device with a haptic module and processor that senses user input, determines haptic feedback, and adjusts voltage applied to actuators using a frequency response function to reduce and uniformize noise radiation, by inversely calculating voltages and predicting noise based on surface speed and acoustic impedance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If haptic feedback is provided by exciting the panel at various touch points, then haptic feedback corresponding to each touch point is delivered, but noise is generated and radiated causing user confusion and inconvenience

Engineering Contradiction:

Improvehaptic feedback deliveryVSAvoidnoise radiation

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by measuring and adjusting the frequency response function at each specific touch point location on the panel. Different locations have different noise characteristics, and the system tailors the haptic feedback voltage and frequency response specifically for each location to minimize noise while maintaining effective haptic delivery.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes physical parameters by measuring the frequency response function (including resonance frequency and damping characteristics) at each touch point and adjusting the haptic feedback voltage and frequency accordingly. This parameter optimization reduces noise radiation while maintaining haptic effectiveness.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If multiple actuators are disposed on the display panel to provide haptic feedback at different locations, then haptic feedback coverage is improved, but noise distribution becomes non-uniform across different locations

Engineering Contradiction:

Improvehaptic feedback coverageVSAvoidnoise uniformity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent segments the display panel into multiple measurement locations and measures the frequency response function at each segment independently. This allows the system to account for location-specific characteristics and adjust haptic feedback accordingly, achieving uniform noise distribution across the entire panel.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs preliminary measurement of the frequency response function at each touch point location before providing haptic feedback. This advance characterization allows the system to pre-calculate the optimal voltage and frequency settings for each location, ensuring uniform noise distribution when haptic feedback is delivered.

Inventive Principle:

Principle #10Preliminary action

3Force

If haptic feedback voltage is increased to enhance tactile sensation, then haptic feedback strength is improved, but radiation noise magnitude increases causing user discomfort

Engineering Contradiction:

Improvehaptic feedback strengthVSAvoidnoise magnitude

Core Design Contradiction:

ForceVSObject-generated harmful factors

Solution Approach 1:

The patent utilizes mechanical vibration principles by measuring the resonance frequency and damping characteristics of the panel at each touch point. By exciting the panel at its resonance frequency with optimized voltage, the system achieves maximum haptic feedback strength with minimum voltage input, thereby reducing noise radiation while maintaining strong tactile sensation.

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

The patent implements feedback by measuring the frequency response function (including resonance frequency and damping ratio) at each touch point and using this information to adjust the haptic feedback voltage and frequency. This closed-loop approach optimizes the balance between haptic feedback strength and noise radiation.

Inventive Principle:

Principle #23Feedback

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 effectively reduces radiation noise and ensures uniform noise distribution across touch locations, enhancing user experience by minimizing discomfort-causing noise while providing tailored haptic feedback.

Implementation Method 1

a haptic module including a plurality of actuators exciting a point of the panel

Methodology Applied

Scientific EffectMechanical vibration: Vibration

Implementation Method 2

noise is generated while the display panel moves due to the providing of haptic feedback

Methodology Applied

Scientific EffectAcoustic radiation: Acoustic Radiation Pressure

Data Source

PatentUS11726573B2Method for providing haptic feedback

Publication Date: 2023.08.15 IND ACADEMIC COOP FOUND YONSEI UNIV

AI summary

A method for providing haptic feedback includes sensing a user's input through a display panel, determining haptic feedback corresponding to the input, and controlling a voltage applied to each of the plurality of actuators to provide the determined haptic feedback to a location where the input is sensed, wherein the controlling of the voltage applied to each of the plurality of actuators includes adjusting the voltage applied to each of the plurality of actuators to reduce the magnitude of radiation noise of the panel due to excitation of the plurality of actuators and to uniformize the magnitude of the noise for each location of the panel.