Touchscreen Interference Suppression via Dynamic Bandwidth Adjustment

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Solution Overview

Problem

Existing touchscreen anti-interference solutions fail to effectively suppress wideband interference signals, leading to reduced touch sensitivity and potential failures in stylus or glove functionality.

Innovation Solution

A method and apparatus that detect wideband interference signals on a touchscreen by reducing the detection bandwidth of a band-pass filter when such signals are present, allowing for improved interference immunity without compromising touch sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the touch decision threshold is increased to suppress interference signals, then interference immunity is improved, but touch sensitivity is reduced

Engineering Contradiction:

Improveinterference immunityVSAvoidtouch sensitivity

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent dynamically adjusts the detection bandwidth parameter of the band-pass filter based on interference detection results. When wideband interference is detected, the bandwidth is reduced to suppress interference while preserving touch sensitivity, resolving the contradiction between interference immunity and touch sensitivity through adaptive parameter modification rather than static threshold adjustment

Inventive Principle:

Principle #35Parameter changes

2Reliability

If frequency hopping is used to avoid narrowband interference, then interference suppression is improved for narrowband signals, but it is ineffective against wideband interference signals

Engineering Contradiction:

Improveinterference suppressionVSAvoideffectiveness against wideband interference

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic bandwidth adjustment of the band-pass filter based on real-time interference detection. The filter bandwidth is adaptively modified according to the detected interference characteristics, enabling the system to effectively suppress both narrowband and wideband interference signals, thereby improving versatility against different interference types

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The detection bandwidth parameter of the band-pass filter is dynamically changed based on interference detection results. When wideband interference is detected across multiple frequencies, the bandwidth is reduced to suppress the interference, making the system effective against wideband signals while maintaining frequency hopping capability for narrowband interference

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If a fixed detection bandwidth is used, then the system is simple to operate, but it cannot effectively suppress wideband interference signals

Engineering Contradiction:

Improvesystem simplicityVSAvoidwideband interference suppression

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system performs self-adjustment of the detection bandwidth based on its own interference detection capabilities. The touchscreen controller automatically detects interference signals and adjusts the filter bandwidth accordingly, eliminating the need for manual intervention while maintaining simplicity of operation

Inventive Principle:

Principle #25Self-service

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 the impact of wideband interference signals on touch sampling, enhancing interference immunity while maintaining touch sensitivity by adjusting the detection bandwidth and frequency to minimize interference.

Implementation Method 1

reducing a detection bandwidth of a band-pass filter from a first detection bandwidth to a second detection bandwidth

Methodology Applied

Scientific EffectBand-pass filtering: Filter (electronic)

Data Source

PatentUS10459572B2Touchscreen interference suppression method and apparatus, and terminal device

Publication Date: 2019.10.29 HUAWEI DEVICE CO LTD

AI summary

This application provides a touchscreen interference suppression method and apparatus, and a terminal device. In the method, when a touchscreen is in an untouched state, whether a wideband interference signal exists in the touchscreen is detected; and when the wideband interference signal exists, a detection bandwidth of a filter unit is reduced.