Head-Mounted Display Alignment Markers for Left-Right Eye Calibration
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Solution Overview
Problem
Existing VR, AR, and MR technologies face challenges in providing comfortable and natural-feeling presentations of virtual image elements due to misalignment of left and right displays relative to a user's eyes, leading to potential discomfort and eye strain.
Innovation Solution
A head-mounted display system with an imaging device to capture user eye images and a processor that provides alignment markers and adjusts image content based on user input to align left and right displays vertically, using eye-tracking for precise alignment and feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment markers and image adjustment features are added to enable vertical alignment, then display alignment precision is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary actions by providing alignment markers before the actual image content is displayed. Users can adjust the vertical alignment of alignment markers independently to calibrate the display system, ensuring proper alignment before viewing virtual or augmented content.
Solution Approach 2:
The system incorporates feedback mechanisms where users can visually compare alignment markers and provide input on vertical alignment adjustments. The system processes this user input and automatically adjusts the image content vertical position accordingly, creating a closed-loop alignment system.
2Measurement precision
If eye-tracking imaging devices are integrated to capture user eye images, then alignment accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The imaging device serves as an intermediary tool that captures eye images and provides data to the processing system. This intermediary enables indirect measurement of eye alignment through captured images, which are then processed to determine vertical alignment status without requiring direct complex measurement systems.
Solution Approach 2:
The system replaces complex mechanical alignment adjustment mechanisms with an image-processing-based approach. Instead of using mechanical sensors or actuators to detect and correct alignment, the system uses imaging devices to capture eye positions and computationally determines alignment status, substituting mechanical systems with optical and computational methods.
Data Source
AI summary
A wearable device may include a head-mounted display (HMD) for rendering a three-dimensional (3D) virtual object which appears to be located in an ambient environment of a user of the display. The relative positions of the HMD and one or more eyes of the user may not be in desired positions to receive image information outputted by the HMD. For example, the HMD-to-eye vertical alignment may be different between the left and right eyes. The wearable device may determine if the HMD is level on the user's head and may then provide the user with a left-eye alignment marker and a right-eye alignment marker. Based on user feedback, the wearable device may determine if there is any left-right vertical misalignment and may take actions to reduce or minimize the effects of any misalignment.