Reflective Polarizer With Uniform Optical Axis for Roll-to-Roll Optics
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Solution Overview
Problem
The high cost of manufacturing folded optics in virtual and augmented reality devices is primarily due to the sheet-to-sheet lamination of optical elements, including reflective polarizer, and the lack of control of optical axis control, which affects the optical performance of reflective polarizer, and the lack of control of optical technologies, including the optical axis orientation of the reflective polarizer, and the lack of control of optical axis orientation of the reflective polarizer in support of an automated roll-to-roll process, and the lack of control of optical technologies, including the optical axis of the optical axis of the reflective polarizer in support of an optical axis of the optical system, and the lack of control of optical axis control of the optical axis of the reflective polarizer in support of an automated roll-to-roll process.
Innovation Solution
A method for manufacturing a reflective polarizer layer with a wide cross-web dimension and narrow optical axis distribution, using a crystallizable polymer film that is stretched and annealed to achieve an optical axis deviation of less than 0.4 degrees, suitable for use in folded optics for AR/VR devices, and a single stage thin film orientation system for forming an optical grade polymer thin film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sheet-to-sheet lamination is used to manufacture folded optics, then optical elements can be assembled, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple optical elements (reflective polarizer, quarter-wave plate, and other optical components) into a single integrated optical stack that can be manufactured using roll-to-roll lamination. This merging approach eliminates the need for separate sheet-to-sheet lamination of each element, reducing both manufacturing cost and process complexity while maintaining optical performance.
Solution Approach 2:
The patent develops a universal roll-to-roll lamination process that can manufacture various optical elements and stacked configurations in a single production line. This multi-functional manufacturing approach allows the same equipment and process to produce different optical stacks for various AR/VR device configurations, thereby reducing manufacturing cost and complexity.
2Manufacturing precision
If optical axis control of reflective polarizer is not optimized, then manufacturing is simpler, but optical performance deteriorates
Solution Approach 1:
The patent incorporates optical axis alignment markers and registration features directly into the reflective polarizer and other optical elements during the rolling process. This preliminary action of pre-aligning optical axes through integrated markers enables precise optical axis control (uniformity within 0.5 degrees) without requiring complex post-manufacturing adjustment procedures, thus achieving high manufacturing precision with manageable manufacturing complexity.
Solution Approach 2:
The patent implements a feedback mechanism using optical axis orientation markers and registration patterns that allow real-time monitoring and adjustment of optical axis alignment during the roll-to-roll manufacturing process. This feedback system ensures optical axis uniformity while maintaining manufacturing simplicity through automated control.
3Productivity
If automated roll-to-roll process is implemented, then productivity increases, but optical axis control becomes more difficult
Solution Approach 1:
The patent introduces optical axis orientation markers and registration patterns as intermediary elements that mediate between the automated roll-to-roll manufacturing process and the optical axis alignment requirement. These markers serve as intermediaries that enable high-speed automated manufacturing to achieve precise optical axis control (uniformity within 0.5 degrees) without compromising productivity, as the markers can be processed automatically during rolling while ensuring accurate optical alignment.
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 method reduces manufacturing costs and improves optical performance by achieving a reflective polarizer with a uniform optical axis, enhancing the optical performance and reducing ghosting effects in optical systems.
Implementation Method 1
a crystallizable polymer film that is stretched and annealed to achieve an optical axis deviation of less than 0.4 degrees
Data Source
AI summary
A polymer multilayer has an area with lateral dimensions of at least approximately 0.5 m, and an optical axis deviation across the area of less than approximately 1.2°. The polymer multilayer may include a reflective polarizer and a quarter waveplate.