Dead-Front Capacitive Touch Interface With Color-Matched Backlighting
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Solution Overview
Problem
Capacitive touch switches in user interfaces of domestic appliances lack effective visual feedback mechanisms to maintain a dead-front appearance when icons are not illuminated, resulting in a monochromatic surface that may not be aesthetically pleasing or user-friendly.
Innovation Solution
A capacitive touch switch design incorporating a transparent insulating panel, a filtering layer with opaque color, a tinted transparent substrate with capacitive electrodes, and a light source that transmits light through the substrate and panel to create invisible icons when not illuminated, along with a method of manufacturing this interface using a printed circuit board and light guides to achieve a monochromatic surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional buttons are used in user controls, then visual feedback is provided through button appearance changes, but the profile height is increased and aesthetic appeal is reduced
Solution Approach 1:
The patent replaces traditional mechanical buttons with a capacitive touch switch system that uses electrical fields to detect user input. This substitution eliminates the need for raised mechanical buttons while maintaining tactile feedback through capacitive sensing, thereby reducing profile height while preserving user interaction capabilities
Solution Approach 2:
The patent employs color-changing indicators or illuminated elements that change appearance based on activation state. When deactivated, the icons become invisible or match the panel color, creating a dead-front appearance. When activated, they display distinct colors or illumination patterns, providing visual feedback without requiring raised buttons
2Ease of operation
If icons are made visible on the panel, then user interface functionality is provided, but the dead-front appearance is compromised when icons are not illuminated
Solution Approach 1:
The patent applies different optical properties to different regions of the panel. The background panel material has one set of optical properties (e.g., opaque or specific color), while the icon regions have different optical properties (e.g., transparent or contrasting color). This local differentiation allows icons to be invisible when deactivated by matching the panel appearance, yet visible when illuminated or activated
Solution Approach 2:
The patent changes optical parameters such as transparency, color, or reflectivity of icon regions based on activation state. When deactivated, icon regions are configured to match the panel's optical parameters, creating a dead-front appearance. When activated, the parameters change to provide visible feedback, maintaining aesthetic appeal while enabling user interface functionality
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 solution provides a visually appealing dead-front effect by making icons invisible when not illuminated, enhancing user experience by maintaining a monochromatic surface appearance, which can be customized in color and functionality.
Implementation Method 1
a light source configured to transmit light through the transparent substrate, the transparent icon, and the transparent insulating panel when energized
Implementation Method 2
the transparent substrate being tinted to substantially match the opaque color of the filtering layer
Data Source
AI summary
A capacitive touch switch is disclosed which includes a transparent insulating panel, a filtering layer having an opaque color, a transparent icon being defined in the filtering layer, a transparent substrate including a capacitive electrode, the transparent substrate being tinted to substantially match the opaque color of the filtering layer, and a light source configured to transmit light through the transparent substrate, the transparent icon, and the transparent insulating panel when energized. A user interface and a method of manufacturing a capacitive touch switch are also disclosed.