Dynamic Spatial Imaging in Smart Glasses
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Solution Overview
Problem
Current display technologies for smart glasses lack the ability to dynamically adjust imaging distances, resulting in a limited and uniform visual experience for users.
Innovation Solution
A display apparatus comprising a control circuit, a display unit, and a spatial light modulator that adjusts imaging distances by changing modulation patterns based on electronic signals, combined with a polarizing beam splitter and a polarizer to filter and project light in a way that creates a dynamic and immersive 3D experience, allowing images to appear at different spatial distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed imaging distance is used in display devices, then the device structure is simple, but the visual experience is limited and uniform
Solution Approach 1:
The patent applies dynamics by making the imaging distance adjustable rather than fixed. The spatial light modulator dynamically changes the focal length of the waveguide, enabling the imaging distance to be adjusted in real-time based on user needs, thus transforming a static system into a dynamic one that adapts to different viewing requirements.
Solution Approach 2:
The patent changes the optical parameter (focal length) of the waveguide using the spatial light modulator. By modifying the focal length parameter, the system can adjust the imaging distance without changing the physical structure of the display device, thereby improving visual experience while maintaining structural simplicity.
2Manufacturing precision
If a spatial light modulator is added to adjust imaging distances, then depth perception is enhanced, but device complexity increases
Solution Approach 1:
The patent uses the spatial light modulator as an intermediary component between the light source and the user's eye. This mediator adjusts the optical properties of light passing through the waveguide, enabling precise control over imaging distance and depth perception without requiring complex mechanical adjustments or multiple display elements.
Solution Approach 2:
The patent replaces potential mechanical adjustment mechanisms with an optical-based spatial light modulator. Instead of physically moving components to change imaging distance, the system uses optical field modulation to achieve the same effect, reducing mechanical complexity while improving precision.
3Illumination intensity
If polarization filtering is used to combine ambient light and modulation images, then light-field control is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by using polarization filtering at specific locations within the optical path. The polarizer is positioned to selectively filter light based on its polarization state, allowing different regions of the optical system to handle different light components (ambient light versus modulation images) with appropriate polarization characteristics, thereby achieving precise light-field control.
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 enables a distinctive visual experience by allowing images to appear at varying distances, enhancing the depth perception and immersion in virtual environments, while also compensating for diopter and astigmatism, thus improving the overall visual experience for users.
Implementation Method 1
a first spatial light modulator, set in front of the display unit and connected to the control circuit through signals, wherein the first spatial light modulator is configured to change modulation patterns or contents based on electronic signals generated by the control circuit, to dynamically adjust spatial imaging distances
Implementation Method 2
a polarizing beam splitter set in front of the first spatial light modulator, wherein one end of the polarizing beam splitter receives images modulated by the first spatial light modulator, and another end of the polarizing prism converts or filters ambient light into first linearly polarized light and projects the first linearly polarized light and the modulation images to a user after combining the first linearly polarized light and the modulation images
Implementation Method 3
a polarizer set behind the display unit, to convert or filter ambient light into the first linearly polarized light
Implementation Method 4
a second spatial light modulator set behind the display unit, wherein the second spatial light modulator compensates ambient light to compensate changes generated when the ambient light passes through the first spatial light modulator and the display unit, so that light-field changes generated, after the ambient light passes through the display apparatus, in two perpendicular polarization directions are the same
Data Source
AI summary
The present disclosure provides a display apparatus, including: a control circuit; a display unit, configured to generate images; and a first spatial light modulator, set at a front end of the display unit and connected to the control circuit through signals, where the first spatial light modulator is configured to change a modulation pattern or content based on electronic signals generated by the control circuit, to dynamically adjust spatial imaging distances. In addition, the present disclosure further provides a method for controlling a display apparatus.