Heat Sensitive Touch Panel for Non-Conductive Object Detection
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Solution Overview
Problem
Capacitive sensing touch panels can only detect conductive objects and fail to detect non-conductive objects, limiting their functionality.
Innovation Solution
A heat sensitive touch panel is developed, comprising a substrate with a sensing layer of heat sensitive blocks and conductive wires that detect touch locations based on temperature changes, allowing the detection of both conductive and non-conductive objects by measuring resistance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a capacitive sensing touch panel is used, then the touch location of a conductive object can be detected, but the touch location of a non-conductive object cannot be detected
Solution Approach 1:
The patent replaces the capacitive sensing mechanism with a thermal conduction-based detection system. Heat sensitive blocks made of thermistor material change resistance based on temperature changes caused by touch objects, enabling detection of both conductive and non-conductive objects through thermal rather than electrical field interaction
Solution Approach 2:
The patent utilizes the temperature coefficient of resistance parameter of heat sensitive materials. The resistance of heat sensitive blocks changes with temperature changes induced by touch objects, allowing the system to detect touch locations based on resistance variations rather than capacitance changes
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 heat sensitive touch panel effectively determines touch locations for both conductive and non-conductive objects by utilizing heat sensitive materials with high temperature coefficients of resistance, enhancing detection accuracy and convenience.
Implementation Method 1
utilizing heat sensitive materials with high temperature coefficients of resistance
Data Source
AI summary
The present disclosure provides a heat sensitive touch panel that comprises a substrate and a sensing layer disposed on the substrate, wherein the sensing layer comprises heat sensitive blocks and conductive wires. The heat sensitive blocks are made of a heat sensitive material and disposed on the substrate. The conductive wires are disposed on the substrate to electrically connect the heat sensitive blocks with a controller. If a finger or a dedicated stylus touches the heat sensitive touch panel, resistance of the heat sensitive blocks will change correspondingly such that the output signals generated when the touch panel is touched by a finger or a dedicated stylus are different from those when untouched, thereby being able to determine the touch location. The heat sensitive touch panel can detect a touch location of a conductive object or a non-conductive object on the touch panel.