Polymer Dispersed Liquid Crystal Shutter Low Voltage Switching
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Solution Overview
Problem
Existing liquid crystal shutters require high driving voltages to switch between light scattering and transparent states, leading to increased power consumption and challenges in meeting environmental certifications.
Innovation Solution
A polymer dispersed liquid crystal (PDLC) light shutter device with nematic liquid crystals and a polymer binder system, which switches between high and low light scattering states using a low driving voltage, achieved by aligning liquid crystal microdroplets within a polymer binder system between transparent substrates with conducting electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high driving voltage is used to achieve light transmission switching, then the light transmission requirement is satisfied, but power consumption increases
Solution Approach 1:
The patent changes the physical parameters of the liquid crystal system by introducing a polymer binder system with specific refractive index matching to the liquid crystal droplets. This parameter modification enables the liquid crystal to switch between transparent and scattering states at lower driving voltages, directly resolving the contradiction between achieving light transmission and minimizing power consumption
Solution Approach 2:
The invention creates a composite material system where liquid crystal droplets are dispersed in a polymer binder system. This composite structure combines the electro-optical properties of liquid crystals with the mechanical stability and refractive index matching of the polymer matrix, enabling low-voltage operation while maintaining effective light transmission control
2Illumination intensity
If high driving voltage is applied to switch the shutter state, then the transmission requirement is met, but compliance with environmental certifications becomes difficult
Solution Approach 1:
By modifying the refractive index parameters of the polymer binder system to match the liquid crystal droplets, the patent enables the shutter to achieve required light transmission levels at lower driving voltages. This parameter optimization reduces power consumption and eliminates harmful high-voltage effects, facilitating compliance with environmental certifications
3Adaptability or versatility
If liquid crystal droplets are dispersed in polymer binder system, then wide viewing angle is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the refractive index parameter of the polymer binder system to match that of the liquid crystal droplets. This parameter matching reduces sensitivity to droplet size variations and improves manufacturing tolerances, enabling wide viewing angles without excessive manufacturing precision requirements
Solution Approach 2:
The invention creates local quality uniformity by ensuring the polymer binder system has consistent refractive index properties throughout the device. This local uniformity compensates for variations in droplet distribution and size, achieving wide viewing angles while maintaining reasonable manufacturing precision standards
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 enables a wide viewing angle and low driving voltage operation, reducing power consumption while maintaining high contrast ratios and broad operating temperature ranges, thus addressing the limitations of existing shutter technologies.
Implementation Method 1
PDLCs consist of micron-size droplets of low-molecular weight nematic liquid crystals dispersed in a polymer binder system... Upon application of a voltage across the electrodes of the shutter, a switching occurs from an opaque, high scattering state to a clear, transparent state
Implementation Method 2
A liquid crystal display can show an image using electro-optical characteristics of a liquid crystal, which is injected into a space defined by two substrates... The electro-optical characteristics of the liquid crystals appear when electric power is applied thereto
Data Source
AI summary
A polymer dispersed liquid crystal light shutter device and method for use of the same are disclosed. First and second substrates are disposed substantially parallel. A polymer binder system is interposed between the first and second substrates and a plurality of liquid crystals are dispersed in the polymer binder system. The liquid crystal shutter device is able to switch between a high light absorbing dark state and a low light absorbing transparent state, and visa versa, with a low driving voltage. The liquid crystal shutter device includes formulations of liquid crystal mixtures having nematic liquid crystals and polymer systems to provide a wide viewing angle, low driving voltage, high contrast ratio, for example.