High Refractive Index Optical Elements via Rigid Rod Polymer Solution Deposition
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Solution Overview
Problem
Conventional optical polymers often have refractive indices that are not sufficiently high, making it difficult to achieve optimal optical performance in applications such as LCDs and other optical devices, and existing processing techniques can introduce stresses and damages that affect the quality of these polymers.
Innovation Solution
The use of polymer solutions with rigid rod-like molecules, deposited using techniques like slot die coating and post-deposition treatments, to form optical elements with high refractive indices without the need for stretching or thermo-processing, thereby minimizing stress and achieving desired optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical polymers with standard processing techniques are used, then manufacturing is easier, but the refractive index is not sufficiently high and stress/damage occurs
Solution Approach 1:
The patent changes the fundamental processing parameters by using solution deposition at low temperatures instead of high-temperature melt processing. This allows achieving high refractive indices (greater than 1.6 or 1.7) without the thermal stresses that damage conventional polymers, resolving the contradiction between optical performance and ease of manufacture
Solution Approach 2:
The patent employs composite material strategies by incorporating rigid rod-like polymer molecules with specific molecular structures (containing aromatic rings, heteroatoms, and rigid backbones) into solution-processable formulations. This enables achieving high refractive indices through molecular composition rather than processing conditions, avoiding stress and damage while maintaining ease of manufacture
2Manufacturing precision
If stretching or thermo-processing is applied to conventional polymers, then optical anisotropy is achieved, but stress and damage are introduced
Solution Approach 1:
The patent replaces mechanical stretching processes with solution deposition and controlled drying/annealing processes. The rigid rod-like polymer molecules self-align during deposition and drying to achieve optical anisotropy without mechanical stress, eliminating the contradiction between achieving optical anisotropy and avoiding stress/damage
Solution Approach 2:
The patent utilizes phase transition principles by controlling the solvent evaporation and drying process to achieve molecular alignment. The polymers transition from solution state to solid film state under controlled conditions, allowing optical anisotropy to develop naturally without mechanical stretching, thus avoiding stress and damage while achieving the desired optical properties
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
This method allows for the creation of optical elements with refractive indices greater than 1.6 or 1.7, suitable for applications like LCDs and optical security films, while avoiding the stresses and damages associated with traditional processing methods.
Implementation Method 1
The solvent may be removed by drying at temperatures of at least about 80° C.
Implementation Method 2
The deposited polymer layer may then be subjected to UV or IR light radiation, or other types of activation energy
Implementation Method 3
The deposited polymer layer may then be subjected to UV or IR light radiation, or other types of activation energy
Implementation Method 4
A solution may include between about 0.1% and 30% by weight of a specific polymer having rigid rod-like molecules
Data Source
AI summary
Provided are methods of depositing polymer solutions on substrates to form various optical elements. A polymer solution may include about 0.1%-30% by weight of a specific polymer having rigid rod-like molecules. The molecules may include various cores, spacers, and sides groups to ensure their solubility, viscosity, and cross-linking ability. The deposition techniques may include slot die, spray, molding, roll coating, and so forth. Pre-deposition techniques may be used to improve wettability and adhesion of substrates. Post-deposition techniques may include ultraviolet cross-linking, specific drying techniques, evaporation of solvent, treating with salt solutions, and shaping. The disclosed polymers and deposition processes may yield optical elements with high refractive index values, such as greater than 1.6. These optical elements may be used as +A plates, −C plates, or biaxial polymers and used as retarders in LCD active panels or as light collimators and light guides.