Vehicle Dimming Assembly Using Transmissive Polarizer
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Solution Overview
Problem
Existing vehicle window glass with dimming functional layers is thick, costly, and prone to defects like dye precipitation and unevenness due to high dye concentration, which affects driving safety and increases vehicle weight.
Innovation Solution
A dimming assembly comprising a first substrate layer, a dimming functional layer, and a polarizing film layer made of transmissive polarizing material, with controlled dye concentration and thickness to achieve a dark state effect, reducing thickness and material cost while avoiding dye precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a relatively thick single-layer dye liquid crystal LC dimming film layer is used to achieve the dark state effect, then the light transmittance can be reduced to achieve dark state, but it is prone to have defects such as dye precipitation, color spots and unevenness
Solution Approach 1:
The patent divides the single thick dimming film layer into two thinner layers: a first dye liquid crystal LC dimming film layer and a second dye liquid crystal LC dimming film layer. Each layer has a thickness of 5-20 μm, which is thinner than the conventional single layer. This segmentation reduces dye concentration in each layer, preventing dye precipitation and color spots while achieving uniform dimming effect through the combination of both layers.
2Illumination intensity
If a double-layer dye liquid crystal LC dimming film layer is used to achieve the dark state effect, then the dark state effect is improved, but the glass for vehicle window becomes relatively thick and the cost is high
Solution Approach 1:
The patent optimizes the thickness parameter of each dimming film layer to be 5-20 μm, which is thinner than conventional single-layer designs. By controlling the thickness parameter and combining two layers with different light transmittance characteristics, the patent achieves the desired dark state effect while reducing overall thickness compared to conventional approaches.
3Illumination intensity
If more dye liquid crystals or increased thickness of the dye liquid crystal is used to achieve lower dark state, then the light transmittance is reduced, but it is prone to have defects such as dye precipitation, color spots and unevenness
Solution Approach 1:
The patent segments the high dye concentration into two separate thinner layers, so that each layer maintains lower dye concentration (avoiding precipitation) while the combination achieves the required overall dimming effect. This segmentation maintains system reliability by preventing dye aggregation and ensuring uniform optical properties throughout the structure.
4Weight of moving object
If the thickness of the glass for vehicle window is reduced to reduce vehicle weight, then the weight is reduced, but the safety performance parameters such as strength and rigidity may be compromised
Solution Approach 1:
The patent uses composite material structure with two different types of dye liquid crystal LC dimming film layers (first layer and second layer) with different light transmittance characteristics. This composite structure allows optimization of both weight and strength by selecting appropriate material combinations and thicknesses for each layer, achieving the desired dimming effect while maintaining structural integrity and safety performance.
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 assembly achieves a dark state effect with reduced thickness and cost, improved stability, and lower weight, addressing the issues of thickness and cost in existing technologies.
Implementation Method 1
a polarizing film layer (30) connected to the dimming functional layer (20), wherein the polarizing film layer (30) is made of a transmissive polarizing material
Data Source
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Figure 5
AI summary
A vehicle and a dimming assembly. The dimming assembly comprises a first substrate layer (10), a dimming functional layer (20) and a polarizing film layer (30), wherein the dimming functional layer (20) is connected to the first substrate layer (10); and the polarizing film layer (30) is connected to the dimming functional layer (20), and the polarizing film layer (30) is made of a transmissive-type polarizing material. The polarizing film layer (30) is made of the transmissive-type polarizing material, and the polarizing film layer (30) and the dimming functional layer (20) are combined with each other, such that when light sequentially passes through the polarizing film layer (30) and the dimming functional layer (20) or sequentially passes through the dimming functional layer (20) and the polarizing film layer (30), the dimming assembly can present a dark-state effect. The thickness of the polarizing film layer (30) is relatively thin, and the material cost is low; and after the polarizing film layer (30) and the dimming functional layer (20) are combined with each other, the thickness of the dimming assembly can be reduced, thereby reducing the cost and also reducing the weight. The content of a dye doped in the dimming functional layer (20) is relatively low, and thus the precipitation of the dye can be prevented.