Dimming Device Vertical Alignment Agent Low Voltage
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Solution Overview
Problem
Conventional dimming devices with liquid crystal layers require high drive voltages, leading to increased power consumption and higher product costs, and are limited in using inexpensive electronic components due to their higher withstand voltage requirements.
Innovation Solution
A dimming device with a polymer dispersed liquid crystal layer sandwiched between transparent substrates, utilizing a vertical alignment agent to achieve a drive voltage of 25 V or less for a haze of 80% or more, eliminating the need for alignment films and allowing the use of inexpensive resin substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an alignment film is used to vertically align the liquid crystal compound, then the liquid crystal can be properly aligned, but the manufacturing process becomes complicated and the manufacturing cost increases
Solution Approach 1:
The invention extracts and removes the alignment film from the device structure, replacing it with a vertical alignment agent incorporated into the liquid crystal composition. This eliminates the separate alignment film layer and its associated coating and heating steps, thereby simplifying the manufacturing process while maintaining vertical alignment functionality
Solution Approach 2:
The invention merges the vertical alignment function with the liquid crystal composition itself by incorporating a vertical alignment agent into the liquid crystal material. This combines multiple functions (liquid crystal operation and vertical alignment) into a single integrated system, eliminating the need for separate alignment films and reducing manufacturing complexity
2Manufacturing precision
If an alignment film with coating and heating steps is used, then vertical alignment is achieved, but the manufacturing cost increases and substrate material choices are limited
Solution Approach 1:
The invention removes the alignment film and its associated coating and heating steps from the manufacturing process. The vertical alignment function is instead achieved through a vertical alignment agent in the liquid crystal composition, eliminating unnecessary process steps and reducing device complexity
Solution Approach 2:
The invention changes the approach from physical/chemical treatment of substrates (coating and heating) to chemical modification of the liquid crystal composition itself. By incorporating the vertical alignment agent into the liquid crystal material, the alignment mechanism changes from substrate-based to composition-based, simplifying the overall process
3Reliability
If conventional liquid crystal layers are used, then the device can function, but high drive voltage is required leading to increased power consumption
Solution Approach 1:
The invention changes the chemical composition parameters of the liquid crystal system by incorporating specific vertical alignment agents and optimizing the liquid crystal compound selection. This composition modification enables the liquid crystal to achieve proper alignment and functionality at lower drive voltages, thereby reducing power consumption while maintaining reliable operation
4Ease of operation
If high drive voltage is required, then the liquid crystal layer can switch states, but inexpensive electronic components with lower withstand voltage cannot be used, increasing product costs
Solution Approach 1:
The invention modifies the electrical parameters of the liquid crystal system through composition optimization, specifically by incorporating vertical alignment agents and selecting appropriate liquid crystal compounds. This reduces the operating voltage requirements, enabling the use of inexpensive electronic components with lower withstand voltage ratings and increasing component selection flexibility
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 provides a cost-effective dimming device with reduced power consumption and lower manufacturing costs, suitable for various applications including smart windows, while maintaining high haze levels and faster switching speeds.
Implementation Method 1
changes a refractive index difference between the liquid crystal compounds or the liquid crystal compound and the macromolecule by controlling an alignment direction of the liquid crystal compound by an electric field, so that a transmissive state and a scattering state of incident light can be switched
Implementation Method 2
the liquid crystal layer comprises a vertical alignment agent, wherein the dimming device has a drive voltage of 25 V or less for providing a haze of 80% or more
Data Source
AI summary
A dimming device includes a pair of transparent substrates and a liquid crystal layer sandwiched between the pair of transparent substrates. The liquid crystal layer includes a vertical alignment agent, and the dimming device has a drive voltage of 25 V or less for providing a haze of 80% or more.