Optical Laminate Structure for Thin, Damage-Resistant Smart Windows
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Solution Overview
Problem
Conventional optical laminates for smart windows face issues such as increased manufacturing complexity, thickness, and damage during transport due to the inclusion of a separate substrate for forming conductive layers, leading to defects when bonded to smart windows.
Innovation Solution
An optical laminate design that forms transparent conductive layers directly on polarizing plates without a separate substrate, utilizing a specific elastic modulus range for the polarizing plates to enhance rigidity and prevent damage during transport and bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate substrate is used to form the conductive layer, then the conductive layer can be properly formed, but the manufacturing process becomes complicated and the laminate thickness increases
Solution Approach 1:
The patent combines the substrate and conductive layer into a single integrated structure where the conductive layer is formed directly on the polarizing plate substrate. This eliminates the need for a separate substrate, simplifying the manufacturing process and reducing laminate thickness while maintaining conductive layer functionality.
2Reliability
If a separate substrate is used to form the conductive layer, then the conductive layer can be properly formed, but the laminate thickness increases
Solution Approach 1:
The patent merges the substrate and conductive layer functions into a single integrated component, eliminating the additional thickness contributed by a separate substrate. The conductive layer is deposited directly onto the polarizing plate, reducing overall laminate thickness.
3Device complexity
If a polarizing plate is used without a supporting substrate, then the manufacturing process is simplified, but the polarizing plate is easily bent and damaged during transport
Solution Approach 1:
The patent modifies the physical parameters of the polarizing plate by selecting materials and designing thicknesses that achieve an optimal balance between flexibility and rigidity. The polarizing plate is designed to have sufficient bending resistance for transport while maintaining the simplified single-substrate structure.
4Device complexity
If a polarizing plate is used without a supporting substrate, then the manufacturing process is simplified, but defects such as lifting and pressing defects occur during bonding
Solution Approach 1:
The patent optimizes the polarizing plate's mechanical parameters including thickness and material selection to prevent bonding defects. The plate is designed with sufficient rigidity to maintain flatness during bonding operations, preventing lifting and pressing defects while keeping the manufacturing process simple.
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 results in a thinner, more durable optical laminate with improved flexural properties, reducing manufacturing complexity and preventing defects, while maintaining optical characteristics.
Implementation Method 1
The optical laminate is driven to change transmittance by driving liquid crystals in response to application of a voltage.
Implementation Method 2
a first transparent conductive layer formed on one surface of 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
Data Source
AI summary
Disclosed is an optical 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 a liquid crystal layer provided between the first transparent conductive layer and the second transparent conductive layer, wherein at least one of the first polarizing plate and the second polarizing plate has an S of 0.5 to 4.0 N·mm as calculated by Equation 1. The optical laminate is free from concerns about damage during transport due to its easy handling, no defects are generated when bonding the optical laminate to a smart window. Also disclosed are a smart window including the optical laminate and an automobile or a window for a building using the same.