Sealed Liquid Crystal Functional Element Aging Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrically controllable optical functional elements in vehicles, such as sun visors, suffer from aging issues due to penetration of harmful substances through exit surfaces, leading to undesirable changes in optical properties like brightening or altered transmittance.
Innovation Solution
A functional element with a stack sequence of carrier films, active layers, and surface electrodes is sealed with a barrier material on its lateral faces to prevent diffusion of harmful substances, using a thermoplastic polymer like polyethylene terephthalate (PET) for enhanced sealing and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the functional element is left unsealed at the lateral faces, then the manufacturing process is simpler and easier, but harmful substances penetrate through the exit surfaces causing aging phenomena like brightening and changes in shading
Solution Approach 1:
A barrier material in the form of a thin film is applied to seal the lateral faces of the functional element. This thin film barrier effectively prevents penetration of harmful substances through the exit surfaces of the active layer, thereby preventing aging phenomena such as brightening and shading changes, while maintaining a simple and lightweight sealing structure.
Solution Approach 2:
The sealing solution uses a composite structure combining the functional element layers (carrier films, active layer, surface electrodes) with a barrier material layer. This composite material approach creates an integrated sealing system that protects the functional element from harmful substances while maintaining the electrical and optical properties of the active layer.
2Reliability
If the lateral faces are completely sealed with barrier material, then aging resistance is significantly improved, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The barrier material is applied to seal the lateral faces completely, providing sufficient protection against harmful substance penetration. This complete sealing approach ensures maximum aging resistance while the application process is designed to be efficient, balancing thorough protection with manufacturing feasibility.
Solution Approach 2:
The barrier material acts as an intermediary layer between the functional element and the external environment. This intermediate barrier prevents direct contact between harmful substances and the active layer, effectively mediating the interaction between the functional element and its environment to prevent aging.
3Object-affected harmful factors
If a barrier material is applied to seal the lateral faces, then harmful substance penetration is prevented, but the device structure becomes more complex
Solution Approach 1:
A thin film barrier material is used to seal the lateral faces of the functional element. This thin film provides effective protection against harmful substance penetration through the exit surfaces while maintaining a simple and lightweight structure that does not significantly increase device complexity.
Solution Approach 2:
The sealing structure uses a composite material approach, integrating the barrier material with the existing functional element layers. This composite structure provides effective protection while maintaining structural simplicity and avoiding excessive complexity in the overall device architecture.
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 sealing significantly reduces or prevents aging phenomena, ensuring improved aging resistance and maintaining the optical properties of the functional element, thereby enhancing the longevity and performance of composite panes in vehicles.
Implementation Method 1
at least one exit surface of the active layer on at least one lateral face of the functional element is sealed at least in sections with a barrier material
Implementation Method 2
When no voltage is applied, the liquid crystals are oriented in a disorderly fashion, resulting in strong scattering of the light passing through the active layer
Implementation Method 3
When a voltage is applied on the surface electrodes, the liquid crystals align themselves in a common direction and the transmittance of light through the active layer is increased
Data Source
AI summary
A functional element having electrically controllable optical properties, includes a stack sequence of at least a first carrier film, an active layer, and a second carrier film, wherein at least one exit surface of the active layer on at least one lateral face of the stack sequence of the functional element is sealed at least in sections with a barrier material.