Capacitive Switching Area in Laminated Glazing
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Solution Overview
Problem
Existing composite panes with capacitive switching areas face challenges in being easily and cost-effectively integrated without obstructing the view, and they often require separate components that can lead to accidental triggering.
Innovation Solution
A composite disk with a capacitive switching area is designed, featuring a substrate, intermediate layers, and a cover plate with an electrically conductive layer separated by thin dividing lines, where the capacitive switching area is connected to sensor electronics through a supply line and connection area, allowing for precise touch detection without visual obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a capacitive switching area is integrated into the composite pane, then touch detection function is achieved, but the view through the pane is obstructed by separate components
Solution Approach 1:
The capacitive switching area is merged directly into the composite pane structure by integrating the electrically conductive layer into one of the intermediate layers. This eliminates the need for separate components attached to the pane surface, thereby maintaining optical transparency while enabling touch detection functionality.
Solution Approach 2:
The intermediate layer of the composite pane serves multiple functions: it acts as both a structural bonding layer between glass substrates and as the carrier for the electrically conductive layer that enables capacitive touch sensing. This multi-functionality reduces the number of separate components needed.
2Adaptability or versatility
If separate components are used for capacitive switching, then the switching area can be implemented, but accidental triggering is more likely to occur
Solution Approach 1:
By integrating the capacitive switching area directly into the composite pane structure, the system reduces the number of separate components and interfaces. This integration improves reliability by eliminating potential failure points and reducing the likelihood of accidental triggering from component misalignment or external interference.
3Adaptability or versatility
If a carrier film with electrically conductive layer is integrated into the composite pane, then the capacitive switching area can be formed, but the manufacturing complexity increases
Solution Approach 1:
The carrier film with the electrically conductive layer is merged with the intermediate layer of the composite pane, allowing the capacitive switching area to be formed during the standard lamination process. This approach avoids additional manufacturing steps and reduces overall device complexity by utilizing existing structural layers.
4Ease of operation
If the capacitive switching area is made visible, then touch detection is easier, but the aesthetic appearance and view through the pane is degraded
Solution Approach 1:
The electrically conductive layer is applied locally only in the specific region where touch detection is required, rather than across the entire pane. This localized approach enables touch functionality while maintaining the aesthetic appearance and optical transparency of the rest of the pane.
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 enables the integration of a capacitive switching area into composite panes without obstructing the view, providing precise touch detection and preventing accidental triggering, while eliminating the need for separate components.
Implementation Method 1
If an object approaches the switching range, the capacitance of the surface electrode to ground or the capacitance of the capacitor formed by the two coupled electrodes changes.
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2A
AI summary
The present invention relates to a composite pane (100) with a capacitive switching region (10), comprising at least: - a substrate (1), - at least one first intermediate layer (2) which is joined extensively to the substrate (1), - at least one second intermediate layer (3, 3') which is joined extensively to the first intermediate layer (2), and - an outer pane (4) which is joined extensively to the second intermediate layer (3, 3'), wherein a carrier film (5) having an electrically conductive layer (6) is arranged at least in sections between the first intermediate layer (2) and the second intermediate layer (3, 3'), a capacitive switching region (10) is separated electrically from the electrically conductive layer (6) by at least one coating-free dividing line (7), the capacitive switching region (10) has a contact region (11), a supply region (12) and a connection region (13), the supply region (12) electrically connects the contact region (11) to the connection region (13) and the connection region (13) is electrically connectable to sensor electronics (14), and the surface capacitance (cI) between the contact region (11) and the external surface (IV) of the substrate (1) is greater than the surface capacitance (cA) between the contact region (11) and the external surface (I) of the outer pane (4).