HMD Micro-Mirror Gradient Control for Eyesight Correction
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Solution Overview
Problem
Current head-mounted display (HMD) technologies fail to precisely measure and correct users' eyesight, particularly for astigmatism, and require re-adjustment when multiple users share the same device, leading to user inconvenience and eye fatigue.
Innovation Solution
An HMD apparatus utilizing an active element with micro-mirrors that adjusts focal length based on detected eyesight information, allowing for automatic correction and miniaturization, while providing a high-definition display by controlling the gradient of micro-mirrors to form an optimized image for each user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an active element with micro-mirrors is used to adjust focal length, then the HMD size is reduced and eyesight correction is improved, but the device complexity increases
Solution Approach 1:
The patent combines the eyesight measurement function and focal length adjustment function into a single active element (MEMS mirror) system. The micro-mirrors serve dual purposes: measuring eyesight by detecting light reflection patterns and adjusting focal length by changing their tilt angles, thereby reducing overall device volume while integrating multiple functions into one component.
Solution Approach 2:
The active element with micro-mirrors performs multiple functions simultaneously: it acts as both an eyesight measurement device and a focal length adjustment mechanism. This multi-functionality reduces the need for separate components, thereby miniaturizing the HMD while maintaining comprehensive eyesight correction capabilities including astigmatism correction.
2Measurement precision
If the gradient of micro-mirrors is controlled to adjust focal length, then eyesight correction precision is improved, but the control complexity increases
Solution Approach 1:
The patent employs dynamic control of micro-mirror gradients where the tilt angles of individual micro-mirrors are continuously adjusted based on detected eyesight parameters. This dynamic adjustment allows precise focal length correction for different vision conditions (myopia, hyperopia, astigmatism) by varying the gradient distribution across the mirror array in real-time.
Solution Approach 2:
The system changes physical parameters of the micro-mirrors (tilt angles and gradient distributions) to achieve different focal lengths and correction patterns. By controlling the angular orientation of each micro-mirror, the system dynamically alters optical path lengths to precisely correct various eyesight conditions without requiring mechanical lens changes.
3Ease of operation
If automatic eyesight detection and correction is implemented, then user convenience is improved, but the measurement and control complexity increases
Solution Approach 1:
The HMD system performs automatic eyesight detection and correction without requiring external equipment or manual user intervention. The active element measures the user's eyesight parameters automatically when the device is worn, and the processor autonomously calculates and applies the appropriate focal length corrections, making the entire process transparent and convenient for the user.
Solution Approach 2:
The system implements a feedback loop where the active element continuously measures eyesight parameters, the processor analyzes the data to determine optimal correction settings, and the micro-mirror gradients are adjusted accordingly. This closed-loop feedback mechanism enables automatic adaptation to different users and viewing conditions, simplifying operation while managing measurement complexity through algorithmic processing.
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 precise eyesight measurement and correction, reduces eye fatigue, and allows for a miniaturized HMD design that provides a high-definition display tailored to individual users, improving user experience and convenience.
Implementation Method 1
an active element comprising a plurality of micro-mirrors and configured to reflect the image provided on the display
Data Source
AI summary
A head mounted display (HMD) apparatus and a display method thereof are provided. The apparatus includes a display configured to provide an image, an active element comprising a plurality of micro-mirrors and configured to reflect the image provided on the display, and a processor configured to detect a user's eyesight and adjust a focal length of the image provided on the display by controlling a gradient of at least some of the plurality of the micro-mirrors based on the detected user's eyesight.