Switch-Controlled Touch Electrodes for Extended Sensing Distance
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Solution Overview
Problem
Conventional non-contact touch systems face challenges in generating sensing signals due to insufficient sensing distance, and adding optical sensors increases costs and components.
Innovation Solution
A touch device with adjustable sensing distance achieved by controlling the electrical connection relationships between touch electrodes using switches, allowing for various sensing scenarios through capacitive signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical sensors are added to enhance sensing sensitivity, then sensing distance is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and removes the optical sensor component from the touch sensing system, achieving sensing functionality through capacitive electrodes alone. This eliminates the need for complex optical components while maintaining touch detection capability through electrical field sensing.
Solution Approach 2:
The patent replaces the optical sensing mechanism with an electrical field-based capacitive sensing mechanism. Instead of using optical sensors to detect touch, the system uses capacitive electrodes to sense changes in electrical field caused by touch operations, substituting a simpler electrical system for a more complex optical one.
2Measurement precision
If optical sensors are added to enhance sensing sensitivity, then sensing distance is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and removes the optical sensor component from the touch sensing system, achieving sensing functionality through capacitive electrodes alone. This eliminates the need for complex optical components while maintaining touch detection capability through electrical field sensing.
Solution Approach 2:
The patent uses simple capacitive electrode structures that are cheaper to manufacture compared to optical sensors. The capacitive sensing approach uses standard conductive materials and simpler fabrication processes, reducing overall manufacturing cost while achieving the required sensing performance.
3Length of stationary object
If sensing distance is increased beyond conventional limits, then non-contact touch capability is improved, but sensing signal generation becomes difficult
Solution Approach 1:
The patent merges multiple electrode functions and combines capacitive sensing with switch-controlled electrical connection to enhance signal generation. By integrating these elements, the system achieves extended sensing distance while maintaining sufficient sensing signal strength through the combined effect of capacitive coupling and electrical connection control.
Solution Approach 2:
The patent changes the electrical connection parameters of the electrodes by controlling switch states, thereby adjusting the sensing characteristics. By modifying how electrodes are electrically connected rather than physically reconfiguring them, the system can optimize sensing signal generation for different touch distances and scenarios.
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 touch device can recognize touch operations within and beyond the sensing distance, optimizing circuit layout and reducing component costs by adjusting the electrical connection between electrodes.
Implementation Method 1
the touch device can change electrical connection relationships of touch electrodes by including switches connecting the touch electrodes, thereby changing a sensing distance of the touch device and making it suitable for various sensing scenarios
Implementation Method 2
A conventional non-contact touch systems is usually difficult to generate sensing signals due to insufficient sensing distance
Data Source
AI summary
A touch device includes a substrate, a plurality of touch electrodes on a surface of the substrate, a plurality of first switches and a plurality of second switches, a switch control circuit, and a touch control circuit. Each of the first switches is connected to at least one of the touch electrodes. The switch control circuit is connected to the first switches and the second switches. The switch control circuit is used to output a first signal to each of the first switches, output a second signal to each of the second switches, and control working states of the first switches and the second switches according to the first signal and the second signal to control connection relationships of the touch electrodes. The touch control circuit is used to recognize touch operations on at least parts of the touch electrodes. A smart apparatus is also provided.