Movable Lens Focus Adjustment for AR Eye Strain
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Solution Overview
Problem
Wearable electronic devices with display devices for augmented reality (AR) or virtual reality (VR) often suffer from pixel granularity issues, leading to reduced immersion and increased eye fatigue due to fixed display-to-eye distances, which do not accommodate varying user eye conditions such as eyesight and field of vision.
Innovation Solution
An electronic device with a housing containing an optical device that includes a display device and a movable lens, capable of detecting spot diameters of light emitted and reflected by a user's eye, allowing for automatic focus adjustment to optimize image clarity and reduce eye strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the display device is fixed at a specific distance from the user's eye, then the device structure is simple and stable, but the user experiences eye fatigue and cannot optimize focus for varying eye conditions
Solution Approach 1:
The patent applies the dynamics principle by making the lens position adjustable rather than fixed. The lens can be dynamically repositioned along the optical axis to accommodate different user eye conditions and focus requirements, transforming the static optical system into a dynamic one that adapts to user needs.
Solution Approach 2:
The patent implements parameter changes by varying the lens position parameter to optimize focus for different users. By changing the distance between the lens and the display device, the system adjusts the focal plane to match individual user eye conditions, thereby improving ease of operation without requiring complex mechanical adjustments.
2Manufacturing precision
If the display device uses minute pixels for high resolution, then pixel granularity is reduced and immersion is improved, but the user still cannot optimize focus for varying eye conditions due to fixed display-to-eye distance
Solution Approach 1:
The patent introduces an intermediary element (the movable lens) between the display device and the user's eye. This lens acts as a mediator that can be positioned at different distances to accommodate various eye conditions, allowing high-resolution display while enabling focus optimization for different users without changing the display hardware itself.
3Measurement precision
If the lens position is fixed, then the device structure is simple and stable, but the spot diameter detected by the light-receiving device varies and cannot be used for accurate focus detection
Solution Approach 1:
The patent implements feedback by using the light-receiving device to detect the spot diameter of light reflected from the user's eye and feed this information back to the control unit. Based on this feedback, the control unit adjusts the lens position to achieve optimal focus, creating a closed-loop system that improves measurement precision.
Solution Approach 2:
The patent applies preliminary action by having the control unit move the lens to different positions before final focus is achieved. The system performs multiple detections at different lens positions and uses this preliminary information to converge on the optimal focus position, improving the accuracy of focus detection.
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 provides enhanced immersion, improved display quality, reduced eye fatigue, and lower power consumption by dynamically adjusting focus to suit individual user conditions, thereby improving the overall VR/AR experience.
Implementation Method 1
detecting, with the use of the light-receiving device, a spot diameter of first light that is emitted from the light-emitting device and reflected by a detection target
Data Source
AI summary
A method for operating an electronic device, which is easy on eyes, is provided. The electronic device includes a display device including a light-emitting device and a light-receiving device, and a lens. The method includes a step of displaying an image for focus adjustment of a user's eye; a step of detecting a spot diameter of first light reflected by the user's eye; a step of moving the lens and detecting a spot diameter of second light reflected by the user's eye; a step of determining whether the spot diameter of the second light is smaller than the spot diameter of the first light; a step of further moving the lens and detecting a spot diameter of the third light reflected by the user's eye in the case where the spot diameter of the second light is smaller than the spot diameter of the first light; a step of determining whether the spot diameter of the third light is smaller than the spot diameter of the second light; and a step of moving the lens to a position at which the spot diameter of the first light has been detected, in the case where the spot diameter of the second light is larger than the spot diameter of the first light.