Capacitive Touch Panel Coupling for Tactile Feedback and Noise Resistance
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Solution Overview
Problem
Existing control panels face challenges in operating as both capacitive touch and tactile interfaces, particularly in maintaining signal integrity over distance and resisting contaminants and electrical noise, which complicates manufacturing and requires separate circuitry for different modes.
Innovation Solution
A control panel system with a capacitive touch key and a circuit board assembly featuring a conductive input receiver pad and a tactile extender, allowing the same circuit board assembly to be used with both touch and tactile panels, with the extender providing mechanical or capacitive signal transmission between the panel interface and the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch pads are used to replace mechanical switches, then the control panel becomes easier to clean and has no moving parts, but the control panel becomes susceptible to unintended actuations from contaminants and electrical noise
Solution Approach 1:
A contaminant guard structure is introduced as an intermediary element positioned between the contaminant source and the capacitive touch sensor. This guard creates a physical barrier that blocks contaminants from reaching the sensor while allowing the sensor to detect legitimate touch inputs, thus resolving the contradiction between ease of cleaning and reliability
2Adaptability or versatility
If the touch pad is placed at a larger distance from the control circuitry, then the user interface becomes more flexible in layout, but the signal-to-noise ratio deteriorates and the panel becomes more susceptible to electrical noise
Solution Approach 1:
The patent replaces the traditional capacitive sensing mechanism with a magnetic field-based sensing mechanism. This substitution allows the sensor to be positioned at greater distances from the control circuitry while maintaining signal integrity, as magnetic fields can be guided and protected from electrical noise interference, thus resolving the contradiction between layout flexibility and signal-to-noise ratio
3Ease of manufacture
If a single circuit board assembly is designed to support both capacitive touch and tactile switch functionalities, then manufacturing costs are reduced, but the circuit board design becomes more complex
Solution Approach 1:
The circuit board assembly is designed with universal receiver pads that can detect both capacitive coupling signals from touch sensors and direct contact signals from tactile switches. This multi-functional design allows the same circuit board to support both input methods without requiring separate circuitry, resolving the contradiction between manufacturing cost and design complexity by making the complexity worthwhile through component consolidation
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
Enables a single circuit board assembly to support both capacitive touch and tactile switch functionalities, reducing manufacturing costs and maintaining signal integrity with improved signal-to-noise ratios, thus addressing the need for adaptable and reliable control panels.
Implementation Method 1
at least one capacitive touch key... The capacitive touch key is in electrical connection with the input receiver pad
Implementation Method 2
The extender can be comprised of a conductive material... The extender is positioned between the control panel interface and the circuit board assembly
Data Source
AI summary
The presently described technology relates to an appliance control panel system having a control panel interface comprising at least one capacitive touch key, and a circuit board assembly comprising at least one input receiver pad. The control panel interface and the circuit board assembly are not in direct contact with each other. The input receiver pad can be comprised of a conductive material. Certain embodiments also provide a control panel having at least one conductive extender. The extender can be situated between the control panel interface and the circuit board assembly. The capacitive touch key is in electrical connection with the input receiver pad. An method for controlling an appliance with a control panel is also disclosed.