HMD Image Alignment 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 of 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 precise alignment and adjustment of the rendering center to maintain optimal image presentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the IPD of the HMD is adjusted to account for variations in interpupillary distance, then the viewing comfort for different users is improved, but the position of the optics changes relative to the electronic display, causing misalignment of 3D or stereoscopic images
Solution Approach 1:
The system uses light sensors to detect the position of optical elements and provides feedback to a controller, which then adjusts the rendering center of the electronic display to compensate for misalignment caused by IPD adjustments
Solution Approach 2:
The system dynamically changes the rendering center parameter of the electronic display based on detected optics position, allowing the display to adapt its output parameters to maintain proper alignment with the moved optics
2Adaptability or versatility
If the position of the optics is changed to accommodate different IPD settings, then the HMD can be used by different people with different interpupillary distances, but the immersion and presence of 3D or stereoscopic images deteriorate
Solution Approach 1:
Light sensors continuously monitor the optics position and provide feedback to maintain proper alignment, ensuring consistent 3D image quality across different IPD settings
Solution Approach 2:
The rendering center is dynamically adjusted based on real-time detection of optics position, allowing the system to adapt to different IPD settings while maintaining reliable 3D image presentation
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 a comfortable viewing experience by maintaining the correct alignment of images with the optical elements, reducing eye strain and enhancing the immersion and presence of 3D or stereoscopic content, regardless of IPD adjustments.
Implementation Method 1
a light sensor generates light measurements based on a pixel pattern displayed by the electronic display to determine the current position of optical elements
Data Source
AI summary
A method of automatic image alignment with head mounted display (HMD) optics includes generating a pixel pattern of display light on an electronic display of the HMD. A light sensor of the HMD then generates light measurements in response to the pixel pattern, where the light measurements are representative of a lateral position of an optical element of the HMD. The method also includes adjusting a rendering center of the electronic display for presentation of one or more images with respect to the optical element based on the light measurements.