Scanning Display Alignment With Variable FOV and Resolution
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Solution Overview
Problem
Misalignment between left-eye and right-eye projectors in head-mounted display devices leads to vertical disparity, particularly in non-rigid frames, impacting user experience and causing discomfort.
Innovation Solution
A scanning display system with a controller that switches between a display mode and an alignment mode, using higher resolution and smaller field of view alignment images to calibrate the projector positions, allowing precise adjustment within the human perception threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If alignment calibration is performed using standard resolution images, then the calibration process is simple and fast, but the alignment precision is insufficient to meet human perception thresholds
Solution Approach 1:
The system dynamically switches between display mode and alignment mode, adjusting the field of view and resolution based on the operational requirement. During alignment calibration, the system transitions to alignment mode with a reduced field of view and higher resolution, while during normal operation, it returns to display mode with full field of view and standard resolution. This dynamic adaptation resolves the contradiction by providing high precision only when needed for calibration.
Solution Approach 2:
The patent changes key parameters (field of view size and image resolution) between two distinct operational modes. In alignment mode, the field of view is reduced and resolution is increased to enhance calibration precision. In display mode, the field of view is maximized and resolution is reduced to maintain normal viewing performance. This parameter switching enables the system to achieve high measurement precision during calibration without permanently increasing device complexity.
2Measurement precision
If the field of view is reduced for alignment calibration, then the resolution increases and calibration precision improves, but the display area decreases
Solution Approach 1:
The field of view is made dynamic rather than fixed, switching between a reduced field of view during alignment calibration and a full field of view during normal display operation. This temporal separation allows the system to enjoy the benefits of both small field of view (high resolution for calibration) and large field of view (normal display area) without compromising either function permanently.
Solution Approach 2:
The operational timeline is segmented into distinct phases: alignment mode for calibration and display mode for normal operation. During the alignment phase, the field of view is reduced to concentrate pixels and improve resolution for precise calibration. During the display phase, the full field of view is restored to provide adequate display area. This temporal segmentation resolves the spatial contradiction between field of view size and resolution.
Data Source
AI summary
One example provides a display device comprising a scanning display system comprising a left-eye projector and a right-eye projector. The display device further comprises a controller configured to control the scanning display system to, in a display mode, output stereoscopic display images using the left-eye projector and the right-eye projector. The stereoscopic display images comprise a first field of view (FOV) and a first resolution. The controller is further configured to control the scanning display system to, in an alignment mode, output a left-eye alignment image and a right-eye alignment image respectively using the left-eye projector and the right-eye projector. One or more of the left-eye alignment image or the right-eye alignment image comprises a second FOV that is smaller than the first FOV, and a second resolution that is higher than the first resolution.