Liquid Crystal Alignment Layer with Methacryloyloxy Silane
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Solution Overview
Problem
Existing liquid crystal switchable displays, particularly in reverse mode, face challenges in achieving high transmittance while maintaining low driving voltage, as increased resin addition enhances transmittance but raises switching voltage, and decreased resin leads to insufficient adhesion and reduced transmittance.
Innovation Solution
A liquid crystal device with a first alignment layer containing methacryloyloxy-containing silane and a bifunctional-group resin, which allows for low driving voltage operation and stable transmittance by forming chemical bonds between reactive functional groups, enabling efficient light passage and switching between transparent and opaque states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the addition amount of resin is increased to enhance transmittance, then the transmittance of the liquid crystal device increases, but the driving voltage required for switching increases
Solution Approach 1:
The patent changes the chemical parameters of the resin by selecting specific bifunctional-group resins with particular molecular structures and functional groups. This allows optimization of the resin's interaction with liquid crystal molecules, achieving high transmittance while maintaining lower driving voltages through modified molecular-level parameters rather than simply increasing resin quantity
Solution Approach 2:
The patent uses composite material formulation by combining specific types of bifunctional-group resins with liquid crystal materials in optimized ratios. The composite system leverages the synergistic effects between the resin's functional groups and liquid crystal molecules to achieve both high transmittance and low driving voltage, resolving the contradiction through material composition optimization
2Power
If the addition amount of resin is decreased to reduce driving voltage, then the driving voltage decreases, but the adhesion becomes insufficient and transmittance decreases
Solution Approach 1:
The patent modifies the chemical parameters of the resin system by introducing specific bifunctional-group resins with enhanced adhesive properties. These resins maintain strong adhesion to liquid crystal molecules even at lower concentrations, ensuring both sufficient bonding strength and high transmittance while enabling lower driving voltages
Solution Approach 2:
The patent employs a small amount of highly effective bifunctional-group resin that delivers maximum performance at minimal concentrations. This approach uses a small quantity of specially designed resin molecules that provide disproportionate benefit in terms of adhesion and optical performance, avoiding the need for large resin additions
3Reliability
If more resin is added to stabilize alignment and improve transmittance, then the adhesion and transmittance improve, but the driving voltage increases
Solution Approach 1:
The patent optimizes the molecular parameters of the resin by selecting bifunctional-group resins with specific functional group configurations that enhance alignment stability through improved molecular interactions. This allows achieving reliable liquid crystal alignment with minimal resin content, thereby maintaining low driving voltages while ensuring stable alignment
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 transmittance in the transparent state with reduced driving voltage, maintaining optical stability and efficient switching between states, suitable for applications in smart windows and flexible displays.
Implementation Method 1
an alignment layer comprising reactive functional groups
Implementation Method 2
switching the orientation of the liquid crystal molecules under the action of electric field
Implementation Method 3
exhibiting high transmittance and low driving voltage
Data Source
AI summary
A liquid crystal device having higher transmittance and lower driving voltage is provided. The liquid crystal device comprises a first substrate having a first conductive layer, a second substrate having a second conductive layer, a first alignment layer and a liquid crystal layer. The first alignment layer comprises a liquid crystal alignment treatment agent and a methacryloyloxy-containing silane and is disposed on the first conductive layer of the first substrate. The liquid crystal layer comprises a liquid crystal material and a bifunctional-group resin and is disposed on the first alignment layer. The second substrate having a second conductive layer is disposed on the liquid crystal layer.