Touch Panel Noise Reduction via Signal Region Segmentation

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Solution Overview

Problem

Touch panels face the challenge of generating irregular noise due to inadvertent contact from a user's hand, which decreases sensitivity and affects performance, as existing methods to reduce noise often compromise sensitivity.

Innovation Solution

A method and system for a touch panel that generates a detection signal, identifies contact regions, calculates intervals between them, and removes noise regions based on effective-noise distances and widths, maintaining sensitivity by distinguishing between effective and noise contact areas.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If sensitivity of the touch panel is decreased to remove palm noise, then noise is reduced, but touch panel performance deteriorates

Engineering Contradiction:

Improvepalm noiseVSAvoidtouch panel performance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The detection signal is segmented into multiple contact regions, and the patent applies different processing methods to different segments. Effective contact regions are identified and preserved while noise regions are removed, allowing selective handling of different signal portions to resolve the contradiction between noise reduction and performance maintenance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the detection signal are assigned different qualities or characteristics. The patent identifies effective contact regions with specific width ranges and applies noise removal only to regions that meet noise criteria, preserving local signal quality where needed while removing noise in other areas.

Inventive Principle:

Principle #3Local quality

2Reliability

If sensitivity of the touch panel is maximized to operate efficiently, then touch panel performance is improved, but irregular noise increases

Engineering Contradiction:

Improvetouch panel performanceVSAvoidirregular noise

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and removes the harmful noise components from the detection signal while preserving the effective contact regions. By identifying noise regions based on width criteria and removing only those specific portions, the system maintains high sensitivity for effective contacts while eliminating irregular noise.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent converts the harmful effect of high sensitivity (which amplifies noise) into a benefit by using the high-sensitivity detection to precisely identify and then remove noise regions. The high sensitivity allows for accurate differentiation between effective contacts and noise, transforming the potential harm into a means for noise elimination.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS8493343B2Touch panel and noise reducing method therefor

Publication Date: 2013.07.23 SAMSUNG DISPLAY CO LTD

AI summary

A method for reducing noise of a touch panel includes: generating a detection signal including at least one contact region; generating a combination noise region including at least a portion of the at least one contact region; and generating a final detection signal. The generating the final detection signal includes removing the combination noise region from the detection signal.