Curved Optical Stack with Flexible Layer for Wrinkle-Free Polarization
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Solution Overview
Problem
Conventional optical systems using reflective polarizers face challenges in achieving high polarization contrast and mechanical flexibility, particularly when formed into curved shapes, due to limitations in thickness and orientation of reflective polarizer films, leading to defects like wrinkling and compromised optical properties.
Innovation Solution
Incorporating a non-adhesive flexible optical layer with a reflective polarizer in an optical stack and using thick, substantially uniaxially oriented reflective polarizer films with additional interference layers, which are bonded together with an adhesive layer, allows for higher sag-to-diameter ratios without defects and improved optical performance in folded optics designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional reflective polarizer films are used in curved optical systems, then the system structure is simple, but the mechanical flexibility is poor and defects like wrinkling occur
Solution Approach 1:
The patent uses a composite structure consisting of a reflective polarizer layer bonded to a flexible substrate layer. This composite material approach allows the optical system to maintain structural simplicity while achieving the mechanical flexibility needed for curved configurations, preventing wrinkling and defects by combining materials with complementary properties.
Solution Approach 2:
The patent modifies physical parameters of the reflective polarizer by controlling its thickness (50-200 micrometers) and degree of uniaxial orientation. By adjusting these parameters, the film achieves both the optical performance required for polarization contrast and the mechanical properties needed for flexible curved configurations without wrinkling.
2Reliability
If thin reflective polarizer films are used to achieve flexibility, then mechanical flexibility improves, but polarization contrast deteriorates
Solution Approach 1:
The patent optimizes the thickness parameter of the reflective polarizer to a specific range (50-200 micrometers) and controls the degree of uniaxial orientation. This parameter optimization ensures that the film is thin enough to provide mechanical flexibility for curved configurations while maintaining sufficient thickness and orientation to achieve high polarization contrast ratio.
Solution Approach 2:
The composite structure of the reflective polarizer bonded to a flexible substrate allows the system to achieve both high polarization contrast ratio and mechanical flexibility. The substrate provides the necessary flexibility while the reflective polarizer layer maintains its optical properties for high polarization contrast.
3Manufacturing precision
If thick reflective polarizer films are used to improve polarization contrast, then optical properties improve, but mechanical flexibility deteriorates
Solution Approach 1:
The patent sets the reflective polarizer thickness within the optimal range of 50-200 micrometers, which is thick enough to provide high polarization contrast ratio but thin enough to maintain mechanical flexibility. This parameter control resolves the contradiction between optical performance and mechanical properties.
Solution Approach 2:
By creating a composite structure where the reflective polarizer is bonded to a flexible substrate, the system achieves both high polarization contrast ratio and mechanical flexibility. The substrate compensates for the reduced flexibility that would result from using a thicker polarizer layer alone.
4Adaptability or versatility
If reflective polarizers are formed into curved shapes with high sag-to-diameter ratios, then optical system design flexibility improves, but defects like wrinkling increase
Solution Approach 1:
The patent controls the thickness and uniaxial orientation of the reflective polarizer to enable the film to be formed into curved shapes with high sag-to-diameter ratios without developing wrinkles or other defects. These parameter adjustments allow the optical system to achieve design flexibility while maintaining optical quality.
Solution Approach 2:
The composite structure of the reflective polarizer bonded to a flexible substrate enables the optical system to achieve high sag-to-diameter ratios in curved configurations. The substrate provides the necessary mechanical compliance to accommodate high curvature without causing wrinkling or defects in the reflective polarizer layer.
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 approach enhances mechanical flexibility and optical properties, such as polarization contrast, by maintaining desired optical properties when formed into curved shapes, and improves manufacturing feasibility of polarizing beam splitters and lens assemblies.
Implementation Method 1
a reflective polarizer substantially transmitting light having a first polarization state and substantially reflecting light having an orthogonal second polarization state
Implementation Method 2
reflective polarizer substantially transmitting light having a first polarization state and substantially reflecting light having an orthogonal second polarization state
Implementation Method 3
At least one location on the non-adhesive flexible optical layer has an optical retardance of less than about 100 nm or greater than about 200 nm at a wavelength of about 550 nm
Data Source
AI summary
An optical component includes a first optical element having a curved first major surface; and an optical stack formed into a curved shape. The optical stack is bonded and conforms to the curved first major surface of the first optical element. The optical stack includes a reflective polarizer including a plurality of polymeric layers; and a non-adhesive flexible optical layer bonded to the reflective polarizer prior to forming the optical stack into the curved shape, such that the non-adhesive flexible optical layer bonded to the reflective polarizer improves a desired optical property of the reflective polarizer upon forming the optical stack into the curved shape relative to that of the reflective polarizer being formed into the curved shape without the non-adhesive flexible optical layer bonded to the reflective polarizer.