Microlens Array With Refractive Index Conversion Layer For Wearable Displays
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Solution Overview
Problem
Wearable electronic devices, such as Head Mounted Displays, face challenges in achieving slimness and high display quality due to misalignment of microlens arrays and complex fabrication processes, which result in reduced field of view and degraded image quality.
Innovation Solution
A slim display device is developed with a microlens array featuring a refractive index conversion layer formed by UV-curable monomers and liquid crystal molecules, and an optical path adjustment layer, which collimates light and maintains a preset distance from the display panel, using a polymer network and alignment materials to vary refractive indices and control light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional microlens arrays are used in wearable electronic devices, then light collimation is achieved, but misalignment errors occur and field of view is reduced
Solution Approach 1:
The patent combines the microlens array and optical path adjustment layer into a single integrated structure. The optical path adjustment layer is formed directly on the microlens array substrate, eliminating the need for separate alignment processes between two independent components. This merging resolves the misalignment issue while maintaining light collimation functionality and expanding field of view.
Solution Approach 2:
The integrated structure serves multiple functions simultaneously: the microlens array provides light collimation, while the optical path adjustment layer performs both optical path correction and structural support. This multi-functionality eliminates the need for separate alignment mechanisms, improving manufacturing precision without compromising field of view.
2Manufacturing precision
If complex fabrication processes are used to achieve precise microlens alignment, then alignment precision is improved, but device complexity increases
Solution Approach 1:
By integrating the optical path adjustment layer directly onto the microlens array substrate, the patent reduces the number of separate fabrication steps. The alignment is achieved through the integrated structure itself rather than through complex multi-step alignment processes, thereby simplifying the fabrication process while maintaining high alignment precision.
Solution Approach 2:
The optical path adjustment layer is formed using the microlens array substrate as the base, allowing the structure to self-align during fabrication. The UV curing process and material deposition occur in-situ on the substrate, eliminating the need for external alignment mechanisms and reducing fabrication complexity.
3Manufacturing precision
If standard optical components are used, then device simplicity is maintained, but display quality is degraded
Solution Approach 1:
The patent employs composite material structures combining organic UV-curable resin with inorganic optical layers. This composite approach enables precise control of optical properties (refractive index, thickness) to achieve high display quality, while the materials are deposited using standard semiconductor fabrication techniques that do not significantly increase device complexity.
Solution Approach 2:
The patent optimizes specific parameters of the optical path adjustment layer (thickness, refractive index, UV curing conditions) to achieve high display quality. By precisely controlling these parameters during fabrication, the patent improves display quality without requiring fundamentally more complex optical structures.
4Manufacturing precision
If UV-curable resin and liquid crystal molecules are used to form refractive index conversion layer, then light distribution is controlled, but fabrication process becomes more complex
Solution Approach 1:
The patent controls the refractive index distribution by adjusting the concentration and composition ratio of liquid crystal molecules within the UV-curable resin matrix. By varying these material parameters, precise light distribution control is achieved. The materials are applied using standard coating and curing processes, so the increased material sophistication does not translate to proportionally increased fabrication complexity.
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 solution enhances display quality by minimizing misalignment errors and achieving a slim design, providing improved field of view and image clarity in wearable electronic devices without the need for special microlenses.
Implementation Method 1
UV-curable monomers react to ultraviolet light to form a polymer network
Implementation Method 2
a refractive index conversion layer in which a refractive index varies from region to region; and an optical path adjustment layer configured to collect the light, emitted from the display part and transmitted by the microlens array
Data Source
AI summary
A display device may include a display configured to emit light for displaying an image, a microlens array on the display and configured to collimate the image incident from the display so as to be delivered to the eyes of a user, the microlens array including a refractive index conversion layer in which a refractive index varies from region to region, and an optical path adjustment layer configured to collect light, emitted from the display and transmitted by the microlens array, and to space the display and the microlens array a preset distance apart from each other. Here, the refractive index conversion layer may include a polymer and liquid crystal molecules that interact with the polymer.