Adaptive Beam Divergence for Virtual Retinal Displays
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Solution Overview
Problem
Existing virtual retinal scan displays face challenges in achieving a large effective total eye box with a simultaneous large visual field, while maintaining high image quality and tolerance to eye movements and smart glasses slipping.
Innovation Solution
The optical system incorporates an adaptive optical element that dynamically varies the beam divergence of the light beam as a function of the angle of incidence on the deflection unit, synchronized with the refraction device of the projector unit, to compensate for different path lengths and ensure optimal image projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a virtual retinal scan display uses a fixed beam divergence, then the optical path is simple, but the image quality deteriorates when the angle of incidence on the deflection unit varies
Solution Approach 1:
The patent applies dynamics by making the beam divergence adjustable rather than fixed. The adaptive optical element dynamically changes the beam divergence according to the angle of incidence on the deflection unit, allowing the system to adapt to varying optical conditions and maintain image quality across different viewing angles.
Solution Approach 2:
The patent changes the parameter of beam divergence based on the angle of incidence. By varying this optical parameter in response to changing conditions, the system maintains optimal image quality without requiring a completely different optical design for each angle.
2Manufacturing precision
If the optical system compensates for different path lengths, then image quality improves, but the device complexity increases
Solution Approach 1:
The adaptive optical element modifies the beam divergence parameter to compensate for varying path lengths. This single parameter adjustment achieves focus compensation without requiring multiple separate optical elements or complex mechanical adjustments.
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
This solution enables an improved functionality of the virtual retinal scan display, achieving a large effective total eye box with a large visual field, high image quality, and high tolerance to eye movements and smart glasses slipping, ensuring comfortable and personalized user experience.
Implementation Method 1
having a refraction device actuable in particular by the projector unit, for the at least one light beam for the scanning projection of the image content
Implementation Method 2
an adaptive optical element for modifying a beam divergence, which is situated in the optical path of the light beam between the light source and the deflection unit
Data Source
AI summary
An optical system for a virtual retinal scan display. The optical system includes an image source which supplies image data, an image processing device for the image data, a projector unit having a light source modulatable in time for generating a light beam, and an actuable refraction device for the light beam for the scanning projection of the image content, a deflection unit onto which the image content is able to be projected and which is designed to guide the projected image content onto an eye of a user, and an adaptive optical element for modifying a beam divergence, which is situated in the optical path between the light source and the deflection unit. The adaptive optical element is able to be actuated so that the beam divergence of the light beam is variable as a function of the angle of incidence of the light beam on the deflection unit.