Laminated Glazing with Picture Frame Interlayer for Device Protection
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Solution Overview
Problem
Electroluminescent materials, liquid crystal devices, and suspended particle devices in laminated glazing are sensitive to temperature and humidity, leading to reduced operational lifespan when exposed to elevated conditions.
Innovation Solution
A laminated glazing design with a suspended particle device positioned between three layers of polyvinyl butyral interlayer material, including an infrared reflective film and a 'picture frame' configuration to minimize temperature sensitivity and prevent air bubble issues, ensuring effective adhesion and reduced humidity sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If an electroluminescent device is incorporated into laminated glazing, then the operational lifetime is extended compared to conventional bulbs, but the device becomes sensitive to temperature and humidity which reduces its half-life under elevated conditions
Solution Approach 1:
The laminate is divided into multiple plies with the electroluminescent device positioned between specific plies. This segmentation creates isolated chambers that control the thermal and humidity environment around the sensitive electrical device, protecting it from extreme conditions while maintaining its extended operational lifetime benefits.
Solution Approach 2:
The interlayer material acts as an intermediary between the electroluminescent device and the external environment. It provides thermal insulation and humidity barrier properties, mediating the harsh environmental conditions to protect the device's reliability while allowing the device to function with extended lifetime.
2Reliability
If the electroluminescent device is laminated between two plies of interlayer material, then the humidity sensitivity is reduced, but air bubbles may develop around the periphery causing de-lamination
Solution Approach 1:
The laminate structure is segmented into multiple plies with strategic cut-outs that create a 'picture frame' configuration. This segmentation allows the interlayer material to wrap around and adhere to the electroluminescent device from multiple directions, eliminating air bubble pockets while maintaining humidity protection.
Solution Approach 2:
The solution transitions from a simple two-ply sandwich structure to a multi-ply three-dimensional configuration with cut-outs. This dimensional change allows the interlayer material to contact the device surface more comprehensively, improving adhesion strength while preventing bubble formation in the peripheral regions.
3Strength
If a 'picture frame' design with three plies of interlayer material is used, then adhesion and bubble prevention are improved, but the device complexity increases
Solution Approach 1:
The laminate is segmented into three plies with cut-outs arranged in a 'picture frame' pattern. This segmentation strategy improves adhesion by increasing the contact surface area between the interlayer material and the electroluminescent device, while the systematic arrangement keeps the manufacturing process manageable.
Solution Approach 2:
The multi-ply 'picture frame' structure serves multiple functions simultaneously: it provides enhanced adhesion, prevents air bubble formation, maintains humidity protection, and offers structural support. This multi-functionality justifies the increased complexity by delivering comprehensive performance benefits in a single integrated design.
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 enhances the durability and performance of electroluminescent devices by reducing temperature sensitivity and preventing air bubble-related de-lamination, maintaining the aesthetic and functional benefits of laminated glazing in varying environmental conditions.
Implementation Method 1
infrared radiation reflecting means provided within the laminate
Implementation Method 2
first, second and third plies of interlayer material, each ply being made from polyvinyl butyral
Data Source
Figure 1~2
Figure 3
AI summary
A laminated glazing comprising two panes of glazing material joined together by at least one ply o f interlayer material, an electrical device (e.g. an electroluminescent lamp, an LCD or an SPD) located between the panes of glazing material and an infrared radiation reflecting means (e.g. reflective film) also located between the panes for reducing the amount of infrared radiation that may otherwise be incident upon the electrical device. One or more of the panes of glazing material and/or the at least one ply of interlayer material may be body-tinted. The glazing may be used as an automotive window, especially as a roof window.