Scattering Liquid Crystal Device With Polygonal Electrode Openings
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Solution Overview
Problem
Conventional liquid crystal devices require polarizers, limiting their brightness and increasing manufacturing complexity, while scattering liquid crystal devices driven by lateral electric fields at low voltage do not address the need for high-performance scattering reflectance effectively.
Innovation Solution
A liquid crystal device configuration featuring a first and second electrode with polygonal openings on a substrate, where the liquid crystal layer exhibits transparency without voltage and scattering properties with applied voltage, enhancing scattering reflectance through the formation of multiple refractive index boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional liquid crystal devices use polarizers, then they can control light transmission, but their brightness is limited and manufacturing complexity increases
Solution Approach 1:
The patent removes the polarizer component from the liquid crystal device structure. By using a scattering liquid crystal layer that inherently scatters light in the off-state, the device achieves its function without requiring external polarizers, thereby simplifying manufacturing and potentially increasing brightness.
Solution Approach 2:
The patent changes the optical properties of the liquid crystal layer by using materials with specific scattering characteristics. The scattering liquid crystal layer is designed to exhibit strong light scattering in the off-state and high transparency in the on-state, replacing the need for polarizer-based light control.
2Use of energy by moving object
If scattering liquid crystal devices use lateral electric fields for low voltage driving, then they can reduce operating voltage, but their scattering reflectance performance is insufficient
Solution Approach 1:
The patent employs a composite structure combining a scattering liquid crystal layer with a specific electrode configuration. The scattering liquid crystal layer is paired with electrodes featuring optimized opening patterns (including projecting portions) to enhance the lateral electric field distribution, thereby improving scattering reflectance while maintaining low voltage operation.
Solution Approach 2:
The patent introduces projecting portions in the electrode openings to create localized variations in the electric field distribution. These projecting portions concentrate the lateral electric field in specific regions, enhancing the scattering effect and reflectance performance in critical areas without increasing overall operating voltage.
3Reliability
If electrode openings are designed with projecting portions, then scattering reflectance is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the electrode opening structure into distinct components: a base opening and projecting portions. This segmentation allows for modular manufacturing processes where the base opening and projecting portions can be formed through separate steps, potentially reducing overall manufacturing precision requirements compared to forming a single complex shape.
Solution Approach 2:
The patent designs the electrode openings with projecting portions that extend in specific directions (first and second directions perpendicular to each other). This preliminary structural design guides the electric field distribution and liquid crystal alignment, making the system more robust to manufacturing variations and reducing the criticality of precise opening dimensions.
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-performance scattering with increased reflectance and isotropic refractive index distribution, eliminating the need for polarizers and simplifying manufacturing by using a lateral electric field and specific electrode opening designs.
Implementation Method 1
the liquid crystal layer exhibits transparency while no voltage being applied and scattering property while voltage being applied
Implementation Method 2
scattering liquid crystal devices utilizing a lateral electric field, which can be driven at low voltage
Implementation Method 3
an electrode, in the liquid crystal layer, which forms a lateral electric field parallel to the substrates
Implementation Method 4
enhancing scattering reflectance through the formation of multiple refractive index boundaries
Implementation Method 5
the liquid crystal layer exhibits transparency while no voltage being applied and scattering property while voltage being applied
Data Source
AI summary
According to one embodiment, a liquid crystal device includes a first substrate including a first electrode and a second electrode, a second substrate, a liquid crystal layer, and the second electrode is located on a side of the liquid crystal layer with respect to the first electrode and includes a first opening, the first opening is formed into a polygonal shape including a base portion and at least one projecting portion projecting from the base portion along a first direction, a width of the base portion along the first direction is greater than a width of the projecting portion along the first direction, and the liquid crystal layer exhibits transparency while no voltage being applied and scattering property while voltage being applied.