Single button capacitive user interface
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Solution Overview
Problem
Conventional refrigeration appliances lack a reliable user interface that provides clear feedback on temperature settings, relying on analog potentiometers with moving parts that wear out over time.
Innovation Solution
A capacitive user interface featuring a single capacitive touch button and LED indicators, where the self-capacitive electrode sensor receives user input and adjusts the storage compartment temperature, providing visual feedback through color-coded LED illumination for temperature settings and special modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a manually turned knob with potentiometer is used for temperature control, then the user interface is simple and easy to manufacture, but the system lacks visual feedback and the moving parts wear out over time
Solution Approach 1:
The patent replaces the mechanical potentiometer system with a capacitive touch sensor system. The self-capacitive electrode sensor detects user input through electrical capacitance changes rather than mechanical rotation, eliminating wear from moving parts while maintaining simple user interaction. This substitution directly improves reliability by removing the mechanical wear issue.
Solution Approach 2:
The patent introduces LED indicators that provide visual feedback to the user about the selected temperature setting. The LEDs illuminate to show the current temperature level, creating a feedback loop that was missing in the conventional knob system. This resolves the contradiction by adding complexity only where needed for feedback, while the core control mechanism remains simple.
2Loss of information
If a manually turned knob with alignment marks is used, then the manufacturing is simple, but the visual indication of temperature set point is minimal and unclear
Solution Approach 1:
The patent uses LED indicators that can change color or illumination state to clearly indicate different temperature settings and operational modes. This provides rich visual information feedback without requiring complex mechanical alignment marks or multiple physical indicators. The color/illumination changes convey temperature levels and special modes intuitively.
Solution Approach 2:
The illuminated LED indicators provide immediate visual feedback to the user about the selected temperature setting and operational status. This feedback mechanism eliminates the information loss present in conventional knobs where users must rely on alignment marks and memory. The feedback is continuous and clear, showing exactly what setting is active.
3Ease of operation
If a capacitive touch button with LED indicators is implemented, then visual feedback and reliability are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The capacitive touch button serves multiple functions: temperature adjustment, mode selection, and providing visual feedback through integration with the LED indicator system. This multi-functionality reduces the need for separate controls for different operations, simplifying the overall user interface despite the advanced technology used. The single button handles what would traditionally require multiple controls.
Solution Approach 2:
The patent combines the control input mechanism (capacitive touch button) with the feedback display system (LED indicators) into a single integrated user interface assembly. This merging reduces the total number of separate components compared to traditional systems with separate knobs, switches, and indicator lights, potentially simplifying assembly and manufacturing processes despite the advanced electronics used.
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 capacitive user interface offers improved reliability and user feedback, eliminating mechanical wear and allowing for precise temperature control with clear visual indicators, enhancing the longevity and usability of the refrigeration appliance.
Implementation Method 1
The controller is configured to receive a signal from the self-capacitive electrode sensor
Implementation Method 2
a plurality of light-emitting diode (LED) indicators configured to display at least one of a temperature setting
Data Source
AI summary
Provided is a refrigeration appliance including a storage compartment, a user interface controller, and a user interface arranged in the storage compartment. The user interface is a stacked arrangement including a sensor assembly carrier, a graphic overlay, a light guide, and a printed circuit board (PCB) with a user interface controller and a self-capacitive electrode sensor. The main controller receives a signal from the user interface with self-capacitive electrode sensor and adjusts the temperature of the storage compartment based on the signal from the self-capacitive electrode sensor. A method controlling a refrigeration appliance with a stacked user interface is also provided.