Interactive Board Material Recognition Using Infrared and Elastic Waves

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Interactive devices struggle to accurately determine the material type of a touch object due to inaccurate or impossible touch area measurements, particularly when using infrared or capacitive touch screens.

Innovation Solution

A method involving an interactive board with an infrared touch sensor and an elastic wave sensor to generate electrical signals, where the infrared touch sensor generates an infrared blocking signal and the elastic wave sensor detects vibrations, allowing for the calculation of a ratio of average energy values to determine the material type of the touch object.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If infrared touch sensor or capacitive touch screen is used for interaction, then touch detection function is achieved, but material type recognition accuracy deteriorates due to inaccurate or impossible touch area measurement

Engineering Contradiction:

Improvetouch detection functionVSAvoidmaterial type recognition accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent segments the touch detection function into two independent systems: infrared touch sensor for touch detection and elastic wave sensor for material recognition. This segmentation allows each sensor to specialize in its optimal detection task, with the elastic wave sensor capturing vibration characteristics that reveal material properties without relying on inaccurate touch area measurements from the infrared system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces elastic wave vibration signals as an intermediary to bridge the gap between touch detection and material recognition. Instead of directly using touch area data from the infrared sensor, the system uses elastic wave sensors to detect vibrations transmitted through the operation panel, which serve as an intermediary indicator of material properties.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If only infrared blocking electrical signal is used for material recognition, then touch detection is achieved, but material specificity is insufficient leading to poor recognition accuracy

Engineering Contradiction:

Improvetouch detection capabilityVSAvoidmaterial specificity information

Core Design Contradiction:

Ease of operationVSLoss of information

Solution Approach 1:

The patent merges two different types of electrical signals: infrared blocking signals for touch detection and elastic wave signals for material characterization. By combining these signals, the system preserves the touch detection capability while adding material-specific information from vibration characteristics, thereby preventing information loss about material properties.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent adds another dimension of information by transitioning from two-dimensional infrared blocking signal analysis to three-dimensional analysis that includes temporal vibration characteristics from elastic waves. This dimensional expansion captures material-specific properties that are invisible to traditional infrared touch detection.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Measurement precision

If elastic wave sensor is used to detect vibration, then material recognition capability is improved, but vibration interference from environment may worsen recognition accuracy

Engineering Contradiction:

Improvematerial recognition capabilityVSAvoidenvironmental vibration interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent implements feedback mechanisms through signal processing that continuously monitors elastic wave signals and adjusts detection parameters to distinguish genuine touch-induced vibrations from environmental noise. The system uses the characteristics of touch-generated vibrations as a reference feedback to filter out unrelated environmental vibrations, thereby maintaining high material recognition accuracy despite environmental interference.

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

This method improves the accuracy of material recognition by combining infrared blocking electrical signals with elastic wave data, overcoming issues of material specificity and vibration interference in existing technologies.

Implementation Method 1

generating an infrared blocking electrical signal by the infrared touch sensor from a first moment when a touch object performs touch operation in a touch detection region

Methodology Applied

Scientific EffectInfrared blocking: Absorption (EM radiation)

Implementation Method 2

the elastic wave sensor is configured to detect vibration of the operation panel and generate an electrical signal

Methodology Applied

Scientific EffectVibration detection: Vibration

Data Source

PatentUS12493385B2Method for recognizing material, interactive board, and storage medium

Publication Date: 2025.12.09 GUANGZHOU SHIYUAN ELECTRONICS CO LTD

AI summary

The present disclosure provides a method for recognizing a material, an interactive board, and a storage medium, which is applied to an interactive board, and the interactive board includes an operation panel, an infrared touch sensor, and an elastic wave sensor. The infrared touch sensor is arranged on at least one edge of the operation panel to form a touch detection region of the interactive board, and the elastic wave sensor is configured to detect vibration of the operation panel and generate an electrical signal.