Augmented Reality Light Guide Optics for Thin, Wide-FOV Displays
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Solution Overview
Problem
Existing augmented reality optical systems face challenges in reducing size and weight while maintaining a sufficient Field of View (FOV) and improving image quality, with beam splitters limiting design flexibility.
Innovation Solution
An optical device comprising a light generating unit, first and second optical elements, and a light guide, where light is transmitted and reflected through these elements to enhance FOV and reduce thickness, utilizing dielectric coatings to manage reflectance and transmittance, and inclining elements to optimize light paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a beam splitter is used in the optical system, then augmented reality image can be reflected to reach the user, but the size and weight of the optical system cannot be reduced
Solution Approach 1:
The patent removes the beam splitter from the optical system and replaces it with a light guide that directs light through the lens. This extraction of the beam splitter function allows for a lighter and simpler optical system while maintaining the augmented reality display capability.
Solution Approach 2:
The lens in the patent serves multiple functions: it focuses light from the display, manages the field of view, and replaces the beam splitter's light direction control. This multi-functionality reduces the number of separate components needed, thereby reducing overall system weight and complexity.
2Weight of moving object
If the thickness of the augmented reality lens is reduced, then the weight is reduced, but the Field of View (FOV) is insufficient
Solution Approach 1:
The patent optimizes the lens parameters including curvature radius, thickness distribution, and refractive index to achieve a balance between thin lens design (for weight reduction) and sufficient field of view. By carefully controlling these parameters, the lens provides both lightweight construction and adequate FOV.
3Use of energy by moving object
If the incident angle on the first optical element is increased, then light transmission is improved, but the reflected light path becomes complex
Solution Approach 1:
The patent uses a light guide that directs light in a controlled path, effectively adding a dimensional control mechanism to manage light propagation. This allows the system to achieve good light transmission without requiring complex reflected light paths through the lens.
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 optical device achieves reduced thickness and weight while maintaining FOV and enhancing image quality, with a simplified manufacturing process.
Implementation Method 1
a first optical element configured to transmit or reflect incident light according to an incident angle
Implementation Method 2
a first optical element configured to transmit or reflect incident light according to an incident angle
Implementation Method 3
a light guide configured to reflect the incident light
Implementation Method 4
a second optical element formed at a predetermined slope and configured to reflect the incident light
Implementation Method 5
the first optical element may have a dielectric coating layer formed thereon
Data Source
AI summary
An optical device for augmented reality, includes: a light generating unit for generating a first light; a first optical element for transmitting or reflecting an incident light according to an incident angle; a light guide for reflecting the incident light; and a second optical element formed with a predetermined slope and reflecting the incident light.