Capacitive Sensor Electrode Integrated with Diffusion Layer
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Solution Overview
Problem
Control panels with indicia or controls are not fully illuminated due to shadowing and negative imaging caused by intervening components between the panel and the light source, leading to incomplete visibility in low ambient light conditions.
Innovation Solution
A control console assembly incorporating a diffusion layer and a capacitive sensor electrode, where the diffusion layer is placed between the light source and the panel, diffusing light to eliminate shadowing and negative imaging, and allowing related circuitry and components to be positioned closely without air gaps, ensuring uniform illumination and effective capacitive sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light source is placed behind the control panel to provide backlighting, then the indicia or controls become visible in low ambient light, but shadowing and negative imaging occur due to intervening components between the panel and light source
Solution Approach 1:
A diffuser layer is introduced as an intermediary component between the light source and the control panel indicia. This diffuser scatters the light rays, preventing direct shadowing by intervening components while maintaining overall illumination. The diffuser acts as a mediator that transforms concentrated light into distributed light, eliminating the harmful shadowing effect while preserving visibility.
2Ease of manufacture
If intervening components are placed between the panel and light source, then the light source can be positioned behind the panel, but shadowing and negative imaging are produced that reduce illumination quality
Solution Approach 1:
The diffuser layer serves as a mediator that allows the light source to be positioned behind the panel (maintaining ease of manufacture) while simultaneously eliminating the shadowing caused by intervening components. The diffuser redistributes light uniformly across the panel surface, resolving the contradiction between manufacturing convenience and illumination quality.
3Reliability
If the electrode of a capacitive sensor is positioned close to the diffusion layer, then capacitive sensing performance is maintained, but air gaps may cause performance degradation
Solution Approach 1:
The electrode of the capacitive sensor is merged with or directly attached to the diffuser layer, eliminating air gaps between these two components. This integration ensures reliable capacitive sensing performance while simplifying the assembly process. The merging of components removes the need for precise spacing control, reducing device complexity despite the critical functional requirement.
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 assembly provides substantially uniform illumination to controls and indicia with no shadowing or negative imaging, enhancing visibility and maintaining capacitive sensor performance by eliminating air gaps and obscuring obstructing components.
Implementation Method 1
a diffusion layer, where the diffusion layer is placed between the light source and the panel, diffusing light to eliminate shadowing and negative imaging
Data Source
AI summary
A control console assembly includes a diffusion layer and an electrode of a capacitive sensor. The diffusion layer has an outer surface and an inner surface substantially opposite the outer surface. The electrode of the capacitive sensor is mated to at least one of the inner surface or the outer surface of the diffusion layer.