Variable Transmittance Optical Device Using Guest-Host Liquid Crystal Film
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Solution Overview
Problem
Existing optical devices with variable transmittance, such as those using liquid crystal compounds, face challenges in achieving high contrast ratios between transparent and black modes while efficiently managing energy consumption and maintaining durability, especially under varying environmental conditions.
Innovation Solution
An optical device incorporating an active liquid crystal element film with a guest host liquid crystal layer, capable of switching between oriented states via voltage application, utilizing a nematic liquid crystal compound and anisotropic dye to control transmittance across UV-A, visible, and near-infrared light ranges, and featuring a folded structure to prevent wrinkles and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If liquid crystal compounds are used to achieve variable transmittance, then transmittance can be adjusted between transparent and black modes, but the contrast ratio and energy consumption efficiency are insufficient
Solution Approach 1:
The patent applies parameter changes by utilizing the voltage-dependent optical properties of liquid crystal compounds. By adjusting the applied voltage, the liquid crystal molecules reorient themselves, changing the transmittance parameter from high (transparent mode) to low (black mode). This enables energy-efficient control where the device maintains its state without continuous power input, only requiring energy for state transitions.
Solution Approach 2:
The patent employs phase transitions of liquid crystal compounds between different orientational states (nematic phase orientations). The liquid crystal material undergoes reorientation transitions when voltage is applied, changing from a state where molecules are aligned parallel to the substrate (transparent mode) to a state where they are perpendicular (black mode), achieving high contrast ratio with low energy consumption.
2Illumination intensity
If liquid crystal compounds are used for transmittance control, then variable transmittance is achieved, but durability under varying environmental conditions deteriorates
Solution Approach 1:
The patent uses composite materials by combining liquid crystal compounds with specific host materials and dichroic dyes in a guest-host cell configuration. This composite structure enhances durability by selecting materials with appropriate thermal stability, chemical resistance, and mechanical properties that can withstand varying environmental conditions while maintaining optical performance.
Solution Approach 2:
The patent applies local quality by optimizing the chemical composition and molecular structure of the liquid crystal compound and host material specifically for environmental stability. The guest-host system allows the liquid crystal molecules to be embedded in a matrix that provides structural support and environmental protection, enhancing overall device reliability without compromising the variable transmittance function.
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 device achieves high contrast ratios with lower energy consumption and improved durability, suitable for applications like eyewear and vehicle sunroofs, maintaining optical performance under temperature and humidity variations.
Implementation Method 1
An optical device incorporating an active liquid crystal element film with a guest host liquid crystal layer, capable of switching between oriented states via voltage application
Implementation Method 2
utilizing a nematic liquid crystal compound and anisotropic dye to control transmittance across UV-A, visible, and near-infrared light ranges
Data Source
AI summary
An optical device capable of varying transmittance, such that can be used for various applications such as eyewear, for example, sunglasses or AR (augmented reality) or VR (virtual reality) eyewear, an outer wall of a building or a sunroof for a vehicle.