Touch Detection Circuit Noise Reduction via Switched Integration

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Solution Overview

Problem

Existing touch detecting apparatuses face reduced detection accuracy due to noise interference, which is mitigated by combining sensor signals but results in blurred object shape data and increased detection time through repetitive signal superimposition methods.

Innovation Solution

A touch detecting apparatus comprising three or more detectors, detection signal lines, switches, and a control circuit that switches between coupling and decoupling modes to integrate outputs from multiple detectors, allowing for accurate shape detection in a shorter time by performing output integration multiple times while changing detector combinations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If signals from multiple sensors are combined to increase signal intensity and reduce noise, then noise resistance is improved, but detection precision deteriorates due to blur in object shape data

Engineering Contradiction:

Improvenoise resistanceVSAvoidobject shape detection accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent segments the detection process into multiple individual detection instances, where each sensor's output is processed separately through integration and complementary processing operations, rather than combining all sensor signals simultaneously. This allows individual shape detection while still achieving noise reduction through multiple measurements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements periodic detection by repeating the touch detection process multiple times, integrating outputs from different sensor combinations in each cycle. This periodic execution enables noise reduction through signal averaging while maintaining shape detection accuracy by processing each cycle's results separately.

Inventive Principle:

Principle #19Periodic action

2Reliability

If touch detection is repeated multiple times and signals are superimposed to increase signal intensity, then noise resistance is improved, but detection time increases

Engineering Contradiction:

Improvenoise resistanceVSAvoiddetection time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent performs preliminary integration of sensor outputs during the detection process itself, rather than requiring separate post-processing steps. The integration line accumulates detection results in real-time, and complementary processing is applied systematically, reducing the overall time required for multiple detection cycles.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent maintains continuous detection and integration operations across multiple measurement cycles, with the integration line continuously accumulating useful signal information. This continuous processing eliminates idle time between detection cycles and efficiently utilizes the detection period to reduce overall measurement time.

Inventive Principle:

Principle #20Continuity of useful action

3Measurement precision

If individual sensor outputs are processed separately to maintain detection precision, then object shape detection accuracy is improved, but noise resistance deteriorates

Engineering Contradiction:

Improveobject shape detection accuracyVSAvoidnoise resistance

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent introduces an integration line as an intermediary element that receives and accumulates outputs from multiple sensors separately. This intermediary structure allows individual sensor signals to be processed independently for shape accuracy while simultaneously building up a combined signal that provides noise resistance through integration of multiple measurements.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces direct mechanical signal combination (which causes blur) with an electrical integration process. The integration line electrically accumulates detection outputs over time and across sensors, providing noise filtering through the integration effect while preserving the individual sensor data integrity needed for accurate shape detection.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS10564763B2Touch detecting apparatus, display apparatus with touch detection function, and touch detection method

Publication Date: 2020.02.18 MAGNOLIA WHITE CORP

AI summary

According to an aspect, a touch detecting apparatus includes: three or more detectors; three or more detection signal lines; an integration line; three or more switches; and a control circuit. The control circuit controls the number of times an output integration is performed. During the output integration, the control circuit switches a first type switch to a decoupling mode, and switches second type switches to a coupling mode. The first type switch is one switch coupled to a first type detector, and each second type switch is coupled to one or more of second type detectors with which the second type switch corresponds. During the output integration, the integration line outputs an integrated output of outputs from the second type detectors. The output integration is performed a plurality of times corresponding to at least the number of the detectors while a combination of the second type detectors is changed.