HOE Smart Glasses Optics Without MEMS Scanner Complexity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing spectacle-type terminal devices face issues with complexity and size due to optical system complications, potential eye safety hazards from short-wavelength laser light, and optical system errors from frame bending.
Innovation Solution
A spectacle-type terminal device with a holographic optical element (HOE) on the lens, an optical engine in the front body portion, and a compact design that uses long-wavelength light, eliminating the need for a MEMS mirror scanner and addressing frame bending errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a MEMS mirror scanner is used to reflect laser light for implementing a virtual image, then the virtual image can be displayed, but the structure becomes complicated and the device size increases
Solution Approach 1:
The patent extracts and removes the MEMS mirror scanner from the optical system, replacing it with a simpler configuration that uses laser light reflection directly off the spectacle glass surface, thereby eliminating the complex moving mechanical components while maintaining virtual image display capability
Solution Approach 2:
The spectacle glass serves multiple functions: it acts as both the display surface for the virtual image and the reflective surface for the laser light, eliminating the need for separate optical components and reducing overall system complexity
2Reliability
If a MEMS mirror scanner is used to implement a virtual image, then the virtual image can be displayed, but the device size increases making compact design difficult
Solution Approach 1:
By removing the MEMS mirror scanner and associated mechanical structures, the patent dramatically reduces the volume required for the optical system, enabling a compact spectacle design that can be worn comfortably
Solution Approach 2:
The patent merges the optical system components into the existing spectacle frame structure, using the glass surface itself as part of the optical path, thereby minimizing the additional volume required beyond the normal spectacle dimensions
3Reliability
If short-wavelength laser light is used as the image source, then the virtual image can be generated, but eye safety problems arise that may damage the eye
Solution Approach 1:
The patent changes the wavelength parameter of the light source, using longer wavelength laser light instead of short-wavelength laser light, which reduces the harmful effects on the eye while maintaining the ability to generate a visible virtual image through reflection off the glass surface
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 device achieves a compact structure, resolves eye safety concerns, and prevents optical system errors while providing a virtual image without the complexity of MEMS mirror scanners.
Implementation Method 1
a holographic optical element (HOE), which is formed in at least one area of photopolymers formed on an inner surface or inside area of the lens, and is configured to display a virtual image corresponding to the image light by diffracting the image light
Implementation Method 2
an optical engine disposed in a region within the front body portion and configured to generate an image light that serves as an image source of a virtual image
Data Source
AI summary
A spectacle-type terminal device comprises: a lens; a front body portion configured to allow parts to be mounted thereon and formed to support and secure the lens; and an optical engine disposed in a region within the front body portion and generating an image light that serves as an image source of a virtual image. There may be formed a holographic optical element (HOE), which is formed in at least one area of photopolymers formed on an inner surface or inside area of the lens, and is configured to display a virtual image corresponding to the image light by diffracting the image light.