Smart Window Optical Laminate With Bubble-Resistant Protective Film
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Solution Overview
Problem
Conventional smart windows using transmittance variable optical laminates are prone to fixed transmittance, causing issues with visibility at night or glare during the day, and surface protection films for these laminates often fail to provide adequate peeling force, leading to bubble formation or film peeling during manufacturing.
Innovation Solution
A transmittance variable optical laminate with a light control laminate structure including polarizing plates, transparent conductive layers, and a liquid crystal layer, protected by a surface protection film with a peeling force of 1.0 N/25 mm to 2.4 N/25 mm and a hard coating layer with a surface pencil hardness of HB to 6H, preventing damage and bubble formation during handling and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a surface protection film is attached to protect the optical laminate, then the optical laminate is protected from surface damage or scratches, but bubbles are generated at the interface between the surface protection film and the adherend surface during ITO deposition
Solution Approach 1:
The patent applies parameter changes by optimizing the peeling force of the surface protection film to a specific range (1.0 N/25 mm to 2.4 N/25 mm). This controlled parameter adjustment ensures the film provides adequate protection during handling while allowing proper peeling during manufacturing processes without causing bubble generation or damage to underlying layers.
2Strength
If the peeling force of the surface protection film is excessively large, then the film provides strong adhesion, but the film inside the laminate is peeled off during the peeling process
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the peeling force parameter within the range of 1.0 N/25 mm to 2.4 N/25 mm. This optimized parameter ensures sufficient adhesion strength for protection during handling while maintaining reliability by preventing film peeling during the peeling process.
3Illumination intensity
If the optical laminate has high transmittance, then visibility is improved, but glare is caused to the driver during the day
Solution Approach 1:
The patent applies dynamics by implementing a transmittance variable optical laminate that can change its light transmittance properties in response to external conditions. This dynamic adjustment allows the laminate to provide high transmittance for visibility when needed while reducing transmittance to prevent glare, adapting to different environmental conditions.
4Object-affected harmful factors
If the optical laminate has low transmittance, then glare is prevented during the day, but visibility is reduced at night
Solution Approach 1:
The transmittance variable optical laminate enables dynamic adjustment of light transmittance to resolve this contradiction. During daytime, the laminate maintains low transmittance to prevent glare, while at nighttime, it switches to high transmittance to ensure adequate visibility, thus adapting to different ambient light conditions.
5Strength
If a hard coating layer is applied to protect the surface, then resistance to scratches and impacts is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies composite materials by integrating a hard coating layer with the optical laminate structure. This composite approach provides enhanced surface hardness and resistance to scratches and impacts while managing the manufacturing complexity through established coating processes.
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 optimized peeling force and surface hardness of the laminate protect it from scratches and external impacts, ensuring durability and preventing bubble formation during manufacturing and peeling, enhancing the reliability of smart windows.
Implementation Method 1
a transmittance variable optical laminate capable of changing the transmittance of light when a voltage is applied has been developed
Implementation Method 2
a surface protection film that may protect the optical laminate from surface damage or scratches by being attached to one or both surfaces of the optical laminate
Data Source
AI summary
The present invention relates to a transmittance variable optical laminate including a light control laminate including: a first polarizing plate; a first transparent conductive layer formed on one surface of the first polarizing plate; a second polarizing plate opposite to the first polarizing plate; a second transparent conductive layer formed on one surface of the second polarizing plate and opposite to the first transparent conductive layer; and a liquid crystal layer provided between the first transparent conductive layer and the second transparent conductive layer, wherein at least one of a surface protection film and a hard coating layer is provided on one or both surfaces of the light control laminate, and at least one of the first transparent conductive layer and the second transparent conductive layer is formed in direct contact with any one of the first polarizing plate and the second polarizing plate, wherein the surface protection film has a peeling force of 1.0 N/25 mm to 2.4 N/25 mm, and the hard coating layer has a surface pencil hardness of HB to 6H, and to a smart window including the same.