Cholesteric Liquid Crystal Element With Inclined Structures
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Solution Overview
Problem
Existing liquid crystal elements using cholesteric liquid crystals face challenges in achieving large-area coverage and mass production due to limitations in the circularly polarized light interference exposure method, which restricts the alignment and phase distribution of cholesteric liquid crystals.
Innovation Solution
A liquid crystal element design featuring a transparent substrate with inclined structures and a staircase surface configuration, where the alignment film is interposed between the substrate and the cholesteric liquid crystal layer, allowing for the helical axis of the cholesteric liquid crystals to be inclined, enabling efficient reflection of circularly polarized light and facilitating larger area coverage and mass production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the circularly polarized light interference exposure method is used to align cholesteric liquid crystals, then the liquid crystals can be aligned in a predetermined direction with desired phase distribution, but the area coverage is limited and large area production is difficult
Solution Approach 1:
The invention divides the alignment function into two parts: a alignment film that provides the alignment direction and a cholesteric liquid crystal layer that provides the phase distribution. This segmentation allows the alignment film to be applied over large areas using conventional techniques while the cholesteric liquid crystal maintains its optical properties across the entire area.
Solution Approach 2:
The alignment film acts as an intermediary between the substrate and the cholesteric liquid crystal layer. It transfers the alignment direction to the liquid crystal molecules without requiring complex interference exposure, enabling large area coverage while maintaining alignment precision.
2Manufacturing precision
If conventional alignment methods are used, then alignment precision can be maintained, but the device complexity and difficulty of mass production increase
Solution Approach 1:
The invention extracts the alignment function from the cholesteric liquid crystal system and places it in a separate alignment film. This simplifies the overall structure by removing the need for complex interference exposure setups while maintaining alignment precision through the film's molecular orientation.
Solution Approach 2:
The alignment film automatically provides the alignment direction through its molecular structure without requiring external alignment devices or complex exposure processes. This self-aligning property reduces device complexity and facilitates mass production.
3Reliability
If the helical axis of cholesteric liquid crystal is made inclined to improve circularly polarized light reflection, then reflective properties are enhanced, but the alignment and phase distribution become more difficult to control
Solution Approach 1:
The invention creates different orientations in different layers: the alignment film maintains a uniform alignment direction for easy control, while the cholesteric liquid crystal layer develops an inclined helical axis for enhanced reflection. This local differentiation allows both control precision and reflective performance to be optimized independently.
Solution Approach 2:
The invention uses a composite structure of alignment film and cholesteric liquid crystal layer where each material contributes its optimal properties. The alignment film ensures precise phase distribution control while the inclined cholesteric liquid crystal provides superior circularly polarized light reflection.
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 allows for the creation of a liquid crystal element that can be easily scaled to larger areas and mass-produced, with improved reflective properties and reduced complexity in alignment, compared to traditional methods.
Implementation Method 1
Cholesteric liquid crystals have properties that reflect light of a specific wavelength according to the helical pitch
Implementation Method 2
reflect light of a specific wavelength according to the helical pitch
Implementation Method 3
an alignment film disposed on a surface of each of the structures and a liquid crystal layer containing a cholesteric liquid crystal and in contact with the alignment film
Data Source
AI summary
According to one embodiment, a liquid crystal element includes a transparent substrate including a first main surface, a plurality of structures disposed on the first main surface and arranged along one direction, an alignment film disposed on a surface of each of the structures and a liquid crystal layer containing a cholesteric liquid crystal and in contact with the alignment film, and the helical axis of the cholesteric liquid crystal is inclined with respect to the first main surface, each of the plurality of structures includes a first surface inclined with respect to the first main surface, in the plurality of structures, the first surfaces are parallel to each other, and the alignment film is interposed between the first surface and the liquid crystal layer.