Near-Eye Display Array Optics for Adaptive Focus and Resolution
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Solution Overview
Problem
Conventional near-eye displays struggle with focusing virtual images into sharp focus for individual users without moving parts, limiting their adaptability and resolution, especially when combined with real-world viewing.
Innovation Solution
A near-eye display utilizing a see-through display coupled with dynamic, switchable optics, including arrays of light-emitting transparent pixels and tunable micro-lenses, which can rapidly focus and steer light to adjust to individual optical prescriptions and switch between virtual and real-world images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional near-eye displays use fixed optics to form virtual images, then the device structure is simple, but the display cannot be adjusted to individual users' optical prescriptions and provides limited adaptability
Solution Approach 1:
The patent applies dynamic optics by replacing fixed optical elements with switchable micro-lenses that can change their focal length and positioning. These micro-lenses can be electronically controlled to adjust the virtual image focus and position, enabling adaptation to different users' optical prescriptions without mechanical moving parts. The dynamic adjustment is achieved through electronic switching between different lens elements in the array.
2Adaptability or versatility
If conventional near-eye displays use moving parts to adjust focus, then the adaptability to users is improved, but the device complexity increases and reliability decreases
Solution Approach 1:
The patent replaces mechanical focusing mechanisms (such as moving lenses or mirrors) with an electronically controlled array of switchable micro-lenses. This substitution eliminates mechanical moving parts that would reduce reliability, while maintaining the ability to adjust focus and adapt to different users. The electronic switching between lens elements provides the same functional adaptability without the reliability penalties of mechanical systems.
3Device complexity
If see-through displays are placed directly in the user's line of sight without optical combiners, then the device simplicity is improved, but the ability to focus virtual images sharply is reduced
Solution Approach 1:
The patent segments the optical function into multiple discrete micro-lenses arranged in an array directly on or near the see-through display. Each micro-lens can be independently controlled to focus light from corresponding display regions. This segmentation allows the system to maintain structural simplicity while achieving sharp virtual image focus through the collective action of multiple focused beamlets that reconstruct the image.
4Measurement precision
If the near-eye display uses static optics, then the device complexity is low, but the resolution and apparent pixel count are limited
Solution Approach 1:
The patent uses dynamically switchable micro-lenses that can rapidly change their optical properties to increase the apparent resolution. By switching between different lens configurations and focal positions, the system can direct light from each physical pixel to multiple apparent pixel locations in the virtual image, effectively multiplying the resolution without proportionally increasing the physical pixel count or optical structure 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
Enables sharp focus and high resolution virtual images adaptable to individual users, allowing simultaneous viewing of virtual and real-world images without moving parts, with rapid switching capabilities.
Implementation Method 1
An array of switchable micro-lenses focus the light so as to form a virtual image as perceived by a person wearing the near-eye display
Data Source
AI summary
Transparent organic light-emitting diodes (OLEDs) can be used as light-emitting pixels in a near-eye display for augmented reality applications. The light from these pixels can be switchably tuned and/or steered with tunable beam-steering and focusing elements, also called tunable micro-lenses. These tunable micro-lenses are arranged in an array and mated to the array of pixels, for example, by embedding in a spectacle lens. The tunable micro-lenses use fast-switching half-wave plates to selectively focus and/or tilt light from the pixels. By switching the light from the pixels between resolvable positions/angles at a rate faster than the flicker fusion threshold (e.g., 60 Hz), the tunable micro-lenses can effectively double the apparent resolution of the near-eye display. And by switching between focusing and non-focusing states at the same rate, the tunable micro-lenses can effectively superimpose the virtual images from the pixels on the real-world image visible through the pixels.