Eye-Tracked Deflection Scanning for Virtual Retinal Displays
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Solution Overview
Problem
Existing virtual retinal display systems face challenges in achieving higher projection line density and image resolution due to limitations in actuating the deflection device.
Innovation Solution
An optical system with an actuable deflection device that adjusts its scanning region based on user eye status, using an eye status detection device and control unit to generate actuation signals for micromirror devices, allowing flexible adjustment of scanning regions and imaging paths to enhance projection line density and image resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the scanning region of the deflection device is fixed, then the system structure is simple, but the projection line density and image resolution are limited
Solution Approach 1:
The patent implements dynamic adjustment of the scanning region by the deflection device based on real-time eye status detection. The scanning region is no longer fixed but adapts its size and position according to the user's pupil location and eye movements, thereby increasing projection line density and image resolution where needed without requiring a permanently complex system structure.
Solution Approach 2:
The system changes the scanning region parameters (size, position, shape) dynamically based on detected eye status. By adjusting these parameters in response to user gaze direction and pupil position, the system achieves variable image resolution and projection line density, resolving the contradiction between fixed simplicity and variable performance.
2Productivity
If the scanning region is adjusted dynamically based on eye status, then projection line density and image resolution are improved, but the device complexity increases
Solution Approach 1:
The system employs a feedback loop where an eye status detection device continuously monitors the user's eye position, pupil location, and gaze direction. This information feeds back to the control unit, which adjusts the deflection device's scanning region accordingly. This closed-loop feedback mechanism enables dynamic optimization of projection line density without requiring overly complex manual control systems.
Solution Approach 2:
The system performs self-adjustment of the scanning region based on automatic eye status detection. The control unit autonomously processes detection data and generates appropriate actuation signals for the deflection device, eliminating the need for manual intervention or complex external control mechanisms, thereby achieving high productivity with manageable device complexity.
3Adaptability or versatility
If multiple imaging paths are used to generate multiple exit pupils, then user flexibility is improved, but the optical system complexity increases
Solution Approach 1:
The optical system employs an optical segmentation element that divides the light beam into multiple imaging paths, each corresponding to a different exit pupil. This segmentation allows multiple users or multiple viewing positions to be supported simultaneously. By using segmentation rather than completely separate optical systems for each user, the patent achieves high adaptability while controlling overall system complexity.
Solution Approach 2:
The deflection device and optical segmentation element serve multiple functions: they simultaneously create multiple exit pupils, adjust scanning regions for different users, and maintain image quality across different viewing positions. This multi-functionality reduces the need for separate dedicated components for each user, thereby achieving user flexibility without proportionally increasing system 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 method and system enable increased projection line density and image resolution by dynamically adapting the scanning region to user eye movements and status, providing a more responsive and high-resolution virtual retinal display experience.
Implementation Method 1
an eye status detection device for detecting and/or determining the eye status of the user. In particular, the eye status detection device is used for detecting and/or determining the movement of the eye, the speed of the eye movement, the pupil position, the pupil size, the direction of view
Implementation Method 2
a projector unit comprising a time-modulable light source for generating at least one light beam and comprising the actuable deflection device for the at least one light beam for the scanning projection of the image content over a scanning region
Data Source
AI summary
A method for actuating an actuable deflection device of an optical system for a virtual retinal display. A first eye status of the user of the virtual retinal display, detected and/or determined using an eye status detection device of the optical system, is received by way of a control unit of the optical system at a first time. In addition, first actuation signals are generated for the actuable deflection device using the control unit, in such a way that the scanning region of the deflection device is adjusted in accordance with the detected and/or determined first eye status of the user.