Laminated Glass Structure to Suppress Liquid Crystal Pooling
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Solution Overview
Problem
Laminated glass with a liquid crystal cell experiences uneven liquid crystal distribution (liquid crystal pool) when exposed to high temperatures, leading to a defective appearance.
Innovation Solution
Incorporating a covering member between the liquid crystal cell and one of the transparent substrates, with a thickness that is 25% or more and 75% or less of the intermediate layer, to control the expansion of the intermediate layer and redistribute the liquid crystal, thereby suppressing the formation of liquid crystal pools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liquid crystal cell is sandwiched between transparent substrates to form a laminated glass, then light transmittance control function is achieved, but liquid crystal pool occurs under high-temperature conditions
Solution Approach 1:
A covering member is introduced as an intermediary component between the liquid crystal cell and the first transparent substrate. This covering member has a specific refractive index (1.40-1.60) that differs from both the liquid crystal cell and the transparent substrate, acting as a mediator to control the expansion behavior of the intermediate layer and prevent liquid crystal pool formation under high-temperature conditions.
Solution Approach 2:
The invention controls the thickness of the covering member within a specific range (25%-75% of the intermediate layer thickness) and specifies a particular refractive index range (1.40-1.60). By adjusting these parameters, the expansion characteristics of the intermediate layer are modified, preventing excessive expansion that would cause liquid crystal pool while maintaining the light transmittance control function.
2Temperature
If the intermediate layer expands under high temperature, then thermal expansion occurs, but liquid crystal becomes unevenly distributed
Solution Approach 1:
The covering member is pre-installed in the structure before high-temperature exposure occurs. Its specific refractive index and thickness create a preliminary constraint on the intermediate layer's expansion, counteracting the thermal expansion effect before it can cause liquid crystal pool formation. This preliminary anti-action prevents the harmful effect rather than correcting it after occurrence.
3Manufacturing precision
If a covering member is added to suppress liquid crystal pool, then appearance quality improves, but device structure becomes more complex
Solution Approach 1:
The covering member is implemented as a thin film or sheet structure with flexible dimensions that can be adjusted to match different device sizes. This thin-film approach adds minimal structural complexity while effectively suppressing liquid crystal pool and improving appearance quality. The covering member can be integrated into the existing lamination process with minimal additional steps.
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 suppresses the formation of liquid crystal pools, maintaining the appearance and light control performance of the laminated glass even under high-temperature conditions.
Implementation Method 1
When a laminated glass which sandwiches a liquid crystal cell is exposed to a high-temperature environment, a base material and a liquid crystal layer of the liquid crystal cell expand.
Data Source
AI summary
A laminated glass capable of suppressing an appearance defect of a liquid crystal cell includes: a first transparent substrate; a second transparent substrate disposed oppositely to the first transparent substrate; a liquid crystal cell provided between the first transparent substrate and the second transparent substrate; a first intermediate layer composed of an OCR and provided between the first transparent substrate and the liquid crystal cell; a second intermediate layer composed of an OCA and provided between the second transparent substrate and the liquid crystal cell; and a covering member provided between the liquid crystal cell and the first transparent substrate. The dimmer cell has a region overlapping the covering member and a region not overlapping the covering member.