Capacitive Vehicle Control Panel Layout for Uniform Backlighting
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Solution Overview
Problem
Existing capacitive proximity sensor systems for operating devices, particularly in vehicles, require significant design and assembly efforts and face challenges with uniform backlighting due to internal components.
Innovation Solution
The operating device features a capacitive proximity sensor system with electrode carrier elements arranged between the front wall and a carrier plate, where each electrode carrier element has an electrode end facing the rear side of the front wall and a contact end electrically connected to the carrier plate, allowing for easy assembly and improved backlighting through a hollow space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitive proximity sensor system is integrated into the front wall with electrodes arranged at the rear side, then the detection reliability is improved, but the assembly complexity increases
Solution Approach 1:
The front wall is divided into multiple symbol fields, each with its own electrode carrier element. This segmentation allows for modular assembly where each electrode carrier element can be independently positioned and connected, reducing the overall assembly complexity while maintaining detection reliability across the entire front wall surface.
Solution Approach 2:
An electrode carrier element is introduced as an intermediary component between the front wall and the electrodes. This carrier element simplifies the assembly process by providing a pre-organized structure that holds multiple electrodes in correct positions, thereby reducing the complexity of directly mounting electrodes to the front wall while ensuring reliable capacitive detection.
2Volume of moving object
If internal components are arranged within the front wall structure, then the compactness is improved, but the backlighting uniformity deteriorates
Solution Approach 1:
The electrode carrier element is positioned in the spatial dimension between the front wall and the carrier plate, creating a hollow space that allows backlight to pass through uniformly. This three-dimensional arrangement maintains structural compactness while resolving the backlighting uniformity issue by separating the internal components from the light path.
Solution Approach 2:
The electrode carrier element acts as a mediator that organizes internal components without obstructing the backlight path. By positioning electrodes on the carrier element rather than directly in the front wall, the design allows uniform backlighting while maintaining component integration and structural compactness.
3Measurement precision
If electrodes are arranged at the rear side of the front wall, then the capacitive detection capability is improved, but the manufacturing complexity increases
Solution Approach 1:
The manufacturing process is segmented into modular steps: first producing the electrode carrier element with pre-attached electrodes, then integrating this assembly into the front wall structure. This segmentation simplifies manufacturing by allowing electrodes to be manufactured and positioned as a separate module, reducing the complexity of directly integrating electrodes into the front wall while maintaining capacitive detection precision.
Solution Approach 2:
The electrode carrier element serves as a manufacturing intermediary that simplifies the production process. electrodes can be manufactured and positioned on the carrier element separately, then the complete assembly is integrated into the front wall, reducing manufacturing complexity while preserving the capacitive detection capability at the rear side of the front wall.
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
This configuration reduces design and assembly complexity while enabling effective capacitive detection and uniform backlighting of symbol fields, enhancing the overall performance and usability of the operating device.
Implementation Method 1
capacitive proximity sensor system including individual electrodes associated with the symbol fields, the electrodes being arranged at the rear side of the front wall... for identifying that symbol field which is approached by an object
Data Source
AI summary
The operating device, such as a human-machine interface, in particular for a vehicle component, is provided with a front wall having a front side that has several fixed symbol fields and having a rear side, a capacitive sensor system that has individual electrodes associated with the symbol fields, which electrodes are arranged on the rear side of the front wall, and a carrier plate that faces the rear side of the front wall and is arranged at a distance from the front wall.