OST Near-Eye Display Lens with Dual Optical Powers for Vision Correction
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Solution Overview
Problem
Existing wearable optical display systems do not effectively integrate ophthalmic correction while providing a clear view of the surrounding environment, as they either obstruct the field of regard or fail to provide adequate vision correction.
Innovation Solution
A novel optical see-through near-eye display system incorporating a partially transmissive partially reflective lens with distinct optical powers for both incoming and reflected light, coupled with an electro-optical unit that projects light images onto the lens, enabling ophthalmic correction and clear transmission of the external scene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wearable optical display system uses a single optical power lens, then the device complexity is reduced, but it cannot provide adequate ophthalmic correction for both reflected and transmitted light paths
Solution Approach 1:
The patent applies local quality by assigning different optical powers to different surfaces of the same lens. The first surface has a first optical power for correcting transmitted light, while the second surface has a second optical power for correcting reflected light. This allows the lens to provide tailored optical correction for each light path without requiring separate lenses, thereby enhancing adaptability while controlling complexity.
Solution Approach 2:
The patent implements universality by designing a single lens that simultaneously performs multiple functions: it corrects vision for both transmitted light (from the external environment) and reflected light (from the display). This multi-functional lens eliminates the need for separate corrective lenses for each path, resolving the contradiction between versatility and complexity.
2Adaptability or versatility
If a wearable optical display system uses a partially transmissive partially reflective lens, then ophthalmic correction is provided, but the field of regard may be obstructed
Solution Approach 1:
The patent applies parameter changes by carefully controlling the optical properties of the lens surfaces. By optimizing the optical powers of the first and second surfaces, the system achieves sufficient reflectivity for display visibility while maintaining adequate transmissivity for environmental viewing. This parameter optimization allows the lens to provide vision correction without significantly obstructing the field of regard.
3Ease of manufacture
If the optical powers for transmitted and reflected light are made equal, then the manufacturing precision is simplified, but the ophthalmic correction effectiveness is reduced
Solution Approach 1:
The patent applies local quality by specifying that the first surface and second surface have different optical powers tailored to their respective functions. The first surface optical power is optimized for transmitted light correction, while the second surface optical power is optimized for reflected light correction. This localized optimization ensures accurate ophthalmic correction for each path, achieving manufacturing precision despite the 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 system provides effective ophthalmic correction for both reflected and incoming light, allowing users to view projected information without obstructing their field of regard, while maintaining clear vision of the surrounding environment.
Implementation Method 1
The partially transmissive partially reflective lens is configured to at least partially transmit incoming light of an outward scene to the eye
Implementation Method 2
enabling reflection of the light beam image toward the eye
Implementation Method 3
The first optical power is configured to provide ophthalmic correction with respect to reflected light beam image, wherein the second optical power is configured to provide ophthalmic correction with respect to transmitted incoming light
Data Source
AI summary
An optical see-through (OST) near-eye display (NED) system, integrating ophthalmic correction for an eye of a user, includes a partially transmissive partially reflective lens, including an inner surface having an inner surface radius of curvature exhibiting a first optical power. An outer surface has an outer surface radius of curvature exhibiting a second optical power. The lens is faces the eye to transmit incoming light of an outward scene to the eye. An electro-optical unit optically couples with the lens, and includes a light display projecting a light beam image onto the inner surface, to reflect the light beam image toward the eye. The electro-optical unit is located at a user's glabellar region. The first optical power provides ophthalmic correction with respect to the reflected light beam image. The second optical power is configured to provide ophthalmic correction with respect to transmitted incoming light from the outward scene.