Capacitive Touch Screen Noise Elimination via Channel Segmentation

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Solution Overview

Problem

Capacitive touch screen panels face efficiency degradation due to external noise, which affects the accuracy of touch input recognition.

Innovation Solution

A touch screen panel and driving method that include a noise measuring unit and a noise eliminating unit to calculate and eliminate noise from sensing data across multiple output channels, using noise ratios and reciprocal calculations to produce noise-eliminated data, thereby minimizing the impact of noise on touch recognition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If capacitive touch screen uses multiple output channels for sensing, then touch recognition capability is improved, but noise from external sources degrades the efficiency

Engineering Contradiction:

Improvetouch recognition capabilityVSAvoidefficiency

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The sensing data from multiple output channels is segmented and processed individually. The noise measuring unit calculates noise values for each channel separately, and the noise eliminating unit processes each channel's data independently using its specific noise characteristics, allowing targeted noise removal while preserving touch recognition capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The noise eliminating unit acts as an intermediary between the noisy sensing data and the final touch recognition process. It introduces intermediate noise eliminated data that serves as a cleaned version of the original sensing data, mediating the effect of external noise on touch recognition efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If noise measurement and elimination processes are added, then noise influence is minimized, but device complexity increases

Engineering Contradiction:

Improvenoise elimination effectivenessVSAvoidprocessing unit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The noise eliminating unit uses the sensing data itself to measure and eliminate noise. The noise measuring unit calculates noise values directly from the sensing data obtained during predetermined periods, and the elimination process uses these self-measured noise characteristics without requiring external calibration or additional reference signals

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system implements feedback by continuously measuring noise values from the sensing data and using these measurements to adjust the noise elimination process. The noise eliminating unit uses the calculated noise values to produce noise eliminated data, creating a closed-loop system that adapts to varying noise conditions

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10528194B2Touch screen panel and driving method of the same

Publication Date: 2020.01.07 SAMSUNG DISPLAY CO LTD

AI summary

The touch screen panel may include: a touch sensor that outputs sensing data through n output channels (“n” is a natural number equal to or larger than 2); a noise measuring unit that calculates a noise value of an m-th output channel (“m” is a natural number smaller than “n”) and a noise value of an m+1-th output channel by using the sensing data outputted from the touch sensor during a predetermined period; and a noise eliminating unit that produces noise eliminated data of the m+1-th output channel by using sensing data of the m-th output channel, sensing data of the m+1-th output channel, the noise value of the m-th output channel, and the noise value of the m+1-th output channel.