Transferable Thin-Film Optical Devices for AR/VR Headsets
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Solution Overview
Problem
Current thin-film optical devices face challenges in being transferred and handled without degrading their optical properties, as removal from substrates can cause tearing or stress, disrupting the molecular pattern and degrading their functionality.
Innovation Solution
A transferrable thin-film optical device is developed, featuring a thin-film layer with a molecular pattern that can be preserved during separation and reattachment, allowing for flexible and removable attachment to various substrates using methods like thermal release or soluble barriers, enabling transfer without affecting optical functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thin-film optical devices are printed directly on a substrate, then the optical elements can be manufactured and handled, but removal from the substrate would cause tearing or stress to the thin films, degrading the optical properties
Solution Approach 1:
The thin-film optical device is segmented into a functional thin-film layer and a separate carrier substrate. The thin-film layer is formed on the carrier substrate using standard fabrication processes, then the entire assembly is transferred to the final destination substrate. This segmentation allows the thin film to be handled during manufacturing without being permanently bonded to the final substrate, preventing tearing and stress damage while maintaining optical properties.
Solution Approach 2:
A carrier substrate serves as an intermediary during the manufacturing and transfer process. The thin-film optical layer is first formed on this temporary carrier substrate, which provides mechanical support and enables standard fabrication techniques. After the thin-film layer is fully formed and optimized, the carrier substrate is removed or transferred along with the thin-film layer to the final destination, allowing the thin film to be manufactured without direct bonding to the final substrate that would cause damage upon removal.
2Ease of manufacture
If thin-film optical devices are printed directly on a substrate, then the optical elements can be manufactured, but they are substantially difficult to be transferred and/or handled without degrading the optical properties
Solution Approach 1:
By separating the thin-film optical layer from the final substrate through the use of a carrier substrate, the system enables independent optimization of each component. The thin-film layer can be manufactured, tested, and optimized on the carrier substrate, then transferred to various different destination substrates as needed. This segmentation provides adaptability and versatility in applying the same thin-film optical design to different substrate types and applications.
Solution Approach 2:
The carrier substrate approach creates a universal manufacturing platform where the same thin-film optical layer can be transferred to multiple different destination substrates. The carrier substrate acts as a universal intermediary that accommodates various fabrication processes and enables the thin-film layer to be adapted to different application requirements and substrate types without remanufacturing.
3Adaptability or versatility
If a separating film is placed between the functional film and the base plate, then the functional film can be transferred, but the device complexity increases
Solution Approach 1:
The carrier substrate serves as a robust intermediary that enables transfer of the thin-film optical layer without requiring complex separating films. The carrier substrate provides strong mechanical support and a reliable interface for forming the thin-film layer, then allows for clean separation or transfer to the destination substrate. This approach simplifies the overall device structure compared to using specialized separating films, while still achieving effective transfer capability.
Data Source
Figure 1~2A
Figure 2B~3B
Figure 4A~4B
AI summary
A transferrable thin-film optical device and a head-mounted display are provided. A transferrable thin-film optical device comprises a thin-film layer providing at least one predetermined optical function. The thin-film layer is configured to be removably attached to a substrate, such that a molecular pattern for the at least one predetermined optical function of the thin-film layer is preserved post removal.