Liquid Crystal Optical Element Structure for Uniform Molecular Alignment
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Solution Overview
Problem
Existing liquid crystal polarization gratings face challenges in increasing productivity and preventing light scattering in larger elements due to the use of molds that require multiple stamping processes, leading to undesired gaps and misalignment of liquid crystal molecules.
Innovation Solution
A liquid crystal optical element design with structured areas and partitions that define alignment directions for liquid crystal molecules, using a single mold to minimize gaps and ensure uniform alignment, thereby reducing light scattering and enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple stamping processes are used to manufacture liquid crystal polarization gratings, then productivity can be increased, but gaps and misalignment of liquid crystal molecules occur leading to light scattering
Solution Approach 1:
The patent merges multiple stamping processes into a single stamping operation by designing a mold with multiple cavities. Each cavity corresponds to a different region of the substrate, allowing all regions to be stamped simultaneously in one process, thereby eliminating gaps and misalignment between regions while maintaining high productivity
Solution Approach 2:
The patent transitions from sequential processing in one dimension (time) to parallel processing in another dimension (space). By arranging multiple stamping cavities in different spatial positions within a single mold, the patent enables simultaneous stamping of multiple substrate regions, resolving the contradiction between productivity and precision
2Manufacturing precision
If a single mold is used to stamp the entire substrate, then alignment precision is improved, but the mold size and complexity increase
Solution Approach 1:
The patent segments the mold into multiple independent cavities, each capable of forming a specific region pattern. This segmentation allows the complex overall pattern to be divided into manageable sections that can be simultaneously stamped, reducing the complexity of each individual stamping operation while achieving high precision across the entire substrate
Solution Approach 2:
The patent designs a universal mold structure that can stamp multiple different region patterns in a single operation. The mold incorporates multiple cavities with different geometries, allowing it to perform multiple functions simultaneously, thereby improving precision without proportionally increasing complexity
3Productivity
If larger substrate sizes are used, then productivity is improved, but light scattering increases due to gaps between stamped regions
Solution Approach 1:
The patent merges adjacent stamped regions by using a single mold that creates overlapping or contiguous patterns across the entire substrate. This eliminates the gaps that would otherwise form between separately stamped regions, preventing light scattering while enabling the use of larger substrate sizes for increased productivity
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 design allows for cost-effective manufacturing of larger liquid crystal optical elements with reduced light scattering, maintaining optimal performance by ensuring uniform alignment of liquid crystal molecules across the substrate.
Implementation Method 1
a liquid crystal polarization grating splits the incident light into 0-th-order diffracted light and first-order diffracted light when light with a wavelength λ is made incident
Data Source
AI summary
According to one embodiment, a liquid crystal optical element according to one embodiment includes a substrate, a plurality of structures aligned at a prescribed pitch in each of a plurality of first areas, and a liquid crystal layer arranged across the plurality of first areas and a second area surrounding each of the plurality of first areas. The liquid crystal layer includes first liquid crystal molecules arranged in the first areas between the adjacent structures and aligned along the structures, and second liquid crystal molecules having the long axes aligned in the same direction in the second area.