HMD Optics Position Detection via Light Sensor Feedback
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Solution Overview
Problem
Adjusting the interpupillary distance (IPD) in head-mounted displays (HMDs) can lead to uncomfortable viewing experiences and eye strain due to changes in the position of optics relative to the electronic display, affecting the immersion and presence experienced by users, especially when viewing 3D or stereoscopic images.
Innovation Solution
The implementation of an automatic position determination mechanism for HMD optics, where a light sensor generates light measurements based on a pixel pattern displayed by the electronic display to determine the current position of optical elements, allowing for the adjustment of the rendering center to align subsequent images with the optical elements, thereby maintaining optimal image alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the IPD of the HMD is adjusted to accommodate different users, then the viewing comfort is improved, but the alignment between the optics and the electronic display changes, leading to degraded image quality and reduced immersion
Solution Approach 1:
The system performs preliminary action by automatically determining the position of optical elements and adjusting the rendering center of the electronic display before the user views images. This pre-alignment ensures that when IPD is adjusted, the rendering center is proactively repositioned to maintain optimal alignment between the optics and display, preventing image quality degradation before it occurs.
Solution Approach 2:
The system implements feedback by using light sensors to detect the position of optical elements and then using this information to automatically adjust the rendering center. This closed-loop feedback mechanism ensures that any changes in optics position due to IPD adjustment are compensated for in real-time, maintaining consistent alignment and image quality across different user configurations.
2Adaptability or versatility
If the position of the optics is changed to adjust IPD, then the adaptability to different users is improved, but the immersion and presence experienced by the user are reduced
Solution Approach 1:
The system applies dynamics by making the rendering center adjustable and repositionable based on detected optics position. Instead of a fixed rendering center, the system dynamically adapts the rendering center location to match the current optics position, allowing the HMD to maintain immersive image quality across different IPD settings while preserving the adaptability benefits of adjustable optics.
3Manufacturing precision
If manual alignment procedures are used to maintain optics-display alignment, then the manufacturing precision is improved, but the device complexity and user burden increase
Solution Approach 1:
The system implements self-service by automatically determining optics position using light sensors and autonomously adjusting the rendering center without user intervention. This eliminates the need for manual alignment procedures, reducing device complexity from the user perspective while maintaining high alignment precision through automated detection and adjustment mechanisms.
Solution Approach 2:
The system replaces mechanical alignment procedures with an optical detection system using light sensors. Instead of requiring physical adjustment mechanisms or manual mechanical alignment, the system uses optical fields to detect optics position and electronically adjusts the rendering center, substituting mechanical complexity with optical and computational solutions.
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 ensures that images are consistently aligned with the user's optics, reducing eye strain and maintaining immersion by automatically adjusting the rendering center based on the determined position of the optical elements, thus enhancing the overall viewing experience across varying IPD settings.
Implementation Method 1
a light sensor generates light measurements based on a pixel pattern displayed by the electronic display
Data Source
AI summary
A head mounted display (HMD) includes an electronic display, an optical element, and a light sensor. The electronic display is configured to generate a pixel pattern of display light and the optical element is disposed to pass the display light to a user of the HMD. The light sensor is disposed proximate to the optical element to generate light measurements in response to the pixel pattern. The light measurements are representative of a lateral position of the optical element with respect to the electronic display.