Segmented Laminated Pane Recess Insulation Leakage Current
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Solution Overview
Problem
Laminated panes with electrically controllable optical properties face issues with leakage currents between adjacent segments due to defective separating lines at the cut edges of multilayer films, leading to incomplete separation and electrical conductivity between segments.
Innovation Solution
Introducing recesses in the first flat electrode at the regions of separating lines to electrically insulate defective areas, ensuring complete separation and preventing leakage currents between segments by overlapping the recesses with the separating lines, thus allowing for selective activation of individual segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separating lines are introduced by laser methods in the region of inhomogeneous cut edge, then electrical isolation between segments is achieved, but leakage current occurs due to discontinuous separating lines
Solution Approach 1:
The patent applies preliminary action by introducing recesses in the carrier film at the cut edge region before the laser separation process. These recesses are positioned to overlap with the separating lines, creating a preliminary structural feature that prevents leakage currents from forming in the first place, rather than attempting to fix leakage after it occurs.
Solution Approach 2:
The recesses in the carrier film act as an intermediary structure between the inhomogeneous cut edge and the separating lines. This intermediary feature disrupts the path of leakage currents by creating physical gaps and insulating barriers, thereby preventing direct electrical contact between adjacent segments through the separating line defects.
2Ease of operation
If the carrier film is cut back to expose the flat electrode for electrical contacting, then electrical contact is enabled, but the cut edge becomes inhomogeneous creating separation defects
Solution Approach 1:
The patent introduces recesses in the carrier film at the cut edge region as a preliminary structural modification. These recesses are created before the final cut-back operation, establishing a controlled geometry that guides the subsequent exposing process and ensures homogeneous cut edges even when the carrier film is removed to expose the flat electrode for electrical contacting.
3Ease of manufacture
If separate production of multilayer film and lamination is used, then manufacturing flexibility is improved, but leakage currents occur at the interface between functional element and panes
Solution Approach 1:
The patent applies preliminary action by introducing recesses in the carrier film at the cut edge region before the lamination process. These recesses are positioned to overlap with the separating lines and extend into the intermediate layer, creating a preliminary insulating structure that prevents leakage currents from forming at the interface between the functional element and the panes during separate production.
Solution Approach 2:
The recesses act as an intermediary structure at the interface between the functional element and the panes. This intermediary feature creates physical separation and electrical insulation at the critical interface region, preventing leakage currents while allowing the separate production processes to maintain their manufacturing flexibility.
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 effectively prevents leakage currents and enables selective switching of the active layer in segments, ensuring reliable electrical separation and improved functionality of the laminated pane with reduced defects in the separating lines.
Implementation Method 1
at least one recess (20) is introduced in the first flat electrode (12) in the region of at least one separating line (16), wherein the portion situated within the recess (20) is electrically insulated from the surface region of the first flat electrode (12) situated outside the recess (20)
Implementation Method 2
When a voltage is applied to the flat electrodes, the liquid crystals align themselves in a common direction and the transmittance of light through the active layer is increased
Implementation Method 3
When no voltage is applied, the liquid crystals are randomly oriented, resulting in strong scattering of the light passing through the active layer
Data Source
AI summary
A laminated pane with an electrically controllable functional element switchable in segments, includes first and second panes joined to one another via an intermediate layer, and a functional element embedded in the intermediate layer. The functional element includes, flat atop one another in this order, a first carrier film, a first flat electrode, an active layer, a second flat electrode, and a second carrier film, the first flat electrode is divided into segments by at least one separating line, a group of first bus bars electrically conductively contacts the first flat electrode, at least one second bus bar electrically conductively contacts the second flat electrode. In the region of a separating line a recess is introduced in the first electrode, which recess surrounds a portion of the first electrode and electrically insulates the portion situated within the recess from the surface region of the first electrode situated outside the recess.