Curved Optical Element Retarder Layer With Uniform Retardation
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Solution Overview
Problem
Existing optical elements with non-planar surfaces and retarder layers face challenges in achieving uniform retardation due to deformation and stress during manufacturing, leading to costly and complex fabrication processes.
Innovation Solution
A single-layer retarder layer with uniform retardation is formed on a non-planar optical surface using a photoalignable material, aligned through polarized light irradiation and heating, eliminating the need for additional alignment layers and allowing for a simplified, cost-effective manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a retarder film is shaped to conform along a non-planar lens, then the optical element can be fabricated, but deformation and stress during heating and forming cause significant change or disappearance of retardation, leading to non-uniform retardation values
Solution Approach 1:
The invention divides the retarder into two functional parts: a substrate layer providing mechanical support and adhesion, and a liquid crystal layer providing the optical retardation function. This segmentation allows the substrate to withstand forming stresses while the liquid crystal layer maintains uniform retardation properties.
Solution Approach 2:
The invention changes the physical state and properties of the liquid crystal material by controlling temperature during phase transitions. By heating above the clearing point and then cooling, the liquid crystal molecules achieve uniform orientation and maintain stable retardation values that are insensitive to subsequent mechanical deformation.
2Manufacturing precision
If a two-layer structure with alignment layer and liquid crystal layer is used, then molecular alignment can be achieved, but the fabrication process becomes complicated and costly with multiple steps including alignment film formation, coating, drying, and thickness adjustment
Solution Approach 1:
The invention merges the substrate layer and liquid crystal layer into a single integrated retarder structure. The substrate layer serves dual functions of mechanical support and adhesion, eliminating the need for separate alignment layers and reducing the total number of fabrication steps while maintaining effective molecular alignment.
Solution Approach 2:
The substrate layer is designed to perform multiple functions simultaneously: providing mechanical strength, ensuring adhesion to the lens surface, and enabling proper orientation of the liquid crystal molecules. This multi-functionality reduces the overall device complexity while achieving the desired alignment.
3Manufacturing precision
If multiple layers are used to form the retarder, then uniform retardation can be achieved, but the thickness of the optical element increases
Solution Approach 1:
The invention uses a thin liquid crystal layer deposited on a flexible substrate that can conform to the non-planar lens surface. This thin-film approach achieves uniform retardation across the curved surface without requiring multiple thick layers, thereby minimizing the overall thickness of the optical element.
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 enables the production of optical elements with uniform retardation values, enhancing display quality by optimizing viewing angle, brightness, and contrast, while reducing thickness and manufacturing complexity.
Implementation Method 1
aligned through polarized light irradiation
Implementation Method 2
aligned through polarized light irradiation and heating
Data Source
AI summary
Provided is an optical element which has a retarder layer that achieves uniform retardation despite a non-planar optical surface of the optical element and which does not require complicated steps for fabrication. The optical element 10 includes a substrate 11 having a non-planar optical surface 11a, and a retarder layer 12 on the optical surface 11a. The retarder layer 12 has a uniform retardation value throughout the layer and is composed of a single layer. The optical element 10 may lack a molecule alignment mechanism to promote retardation in the retarder layer 12.