Patterned Gradient Polymer Film for Optical Layer Merging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical systems face challenges in achieving desired optical properties such as transmittance, haze, clarity, and refractive index, particularly in managing incident light effectively, and in maintaining durability and reducing manufacturing costs while improving optical performance.
Innovation Solution
The development of patterned gradient polymer films with varying local volume fractions of nanovoids across a transverse plane, which can include a binder and a plurality of nanovoids, integrated with substrates like release liners, diffusers, or reflectors, to control optical properties like refractive index, haze, and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an air layer and diffuser layer are incorporated into the optical system to manage incident light, then optical performance (transmittance, haze, clarity) is improved, but device complexity increases
Solution Approach 1:
The patent combines the air layer and diffuser layer into a single integrated gradient polymer film with patterned nanovoids. This merging eliminates the need for separate layers while maintaining the optical functions of both, thereby reducing device complexity while preserving optical performance.
Solution Approach 2:
The gradient polymer film uses a composite structure with a polymer binder and nanovoids creating a gradient refractive index material. This composite approach allows simultaneous achievement of diffuser and air layer functions within a single material system, reducing overall system complexity.
2Reliability
If multiple optical layers are used to achieve desired optical properties, then optical performance is improved, but manufacturing cost increases
Solution Approach 1:
By merging multiple optical layers into a single gradient polymer film, the patent reduces the number of manufacturing steps, material handling operations, and assembly processes required, thereby lowering manufacturing costs while maintaining optical performance.
Solution Approach 2:
The patent employs continuous gradient refractive index variations and patterned nanovoid distributions to achieve desired optical properties within a single layer, eliminating the need for multiple discrete layers and associated manufacturing complexity and cost.
3Ease of manufacture
If uniform nanovoid distribution is used in the polymer film, then manufacturing simplicity is maintained, but optical performance (refractive index control, haze, transmission) is limited
Solution Approach 1:
The patent implements patterned nanovoid distributions with varying local volume fractions across the film thickness and lateral dimensions. This creates spatially varying refractive indices and optical properties in different regions, enabling sophisticated light management while maintaining a single-film manufacturing approach.
Solution Approach 2:
The gradient polymer film combines polymer binder with controlled nanovoid distributions to create a composite material with spatially varying optical properties. This allows independent optimization of refractive index, haze, and transmission in different regions without requiring multiple uniform layers.
4Reliability
If the local volume fraction of nanovoids varies across the transverse plane, then optical performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent achieves patterned nanovoid distributions by controlling polymerization parameters such as UV irradiation intensity and duration during fabrication. By varying these parameters spatially, the nanovoid volume fraction is controlled to create desired gradient patterns, balancing optical performance with manufacturability.
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
These gradient polymer films enhance optical performance by supporting total internal reflection, improving durability, reducing manufacturing costs, and maintaining or improving retro-reflectivity and on-axis brightness in optical systems, while also allowing for controlled light extraction and scattering.
Implementation Method 1
These gradient polymer films enhance optical performance by supporting total internal reflection
Implementation Method 2
The dimensions of the pores or voids in a nanovoided article can generally be described as having an average effective diameter which can range from about 1 nanometer to about 1000 nanometers
Implementation Method 3
a gradient polymer film that includes a binder and a plurality of nanovoids, wherein a local volume fraction of the plurality of nanovoids varies across a transverse plane of the gradient polymer film
Data Source
AI summary
The present disclosure generally relates to patterned gradient polymer films and methods for making the same, and more particularly to patterned gradient optical films that have regions that include variations in optical properties such as refractive index, haze, transmission, clarity, or a combination thereof. The variation in optical properties can occur across a transverse plane of the film as well as through a thickness direction of the film.