Field Sequential Display Color Sub-field Timing Warping
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Solution Overview
Problem
Field sequential display systems face challenges in maintaining image quality when used in moving head-worn displays, as head movements cause noticeable shifts in pixel positions, leading to artifacts like color fringing and color break-up, especially during rapid head movements.
Innovation Solution
The system warps multi-field color virtual content by adjusting the timing of color sub-fields based on predicted head poses, using a series of pulses to align pixel activation with the intended geometric positions, minimizing color break-up artifacts and improving image stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If field sequential display projects color sub-images at high rates to deliver smooth color MR scenarios, then image quality is improved, but device complexity increases due to the need for precise timing adjustment during head movement
Solution Approach 1:
The system performs preliminary warping of color sub-images based on predicted head poses before projection. By anticipating head movements and pre-calculating the necessary geometric transformations, the display maintains image quality without requiring complex real-time timing adjustments during the actual projection of each color field.
Solution Approach 2:
The patent implements dynamic warping that adapts to actual head poses in real-time. The system continuously adjusts the warping parameters based on feedback from head tracking sensors, allowing the display to maintain geometric accuracy despite changes in user head position during the field sequential projection cycle.
2Device complexity
If the display uses conventional field sequential projection without timing adjustment, then device complexity is reduced, but image quality deteriorates due to color break-up artifacts during head movement
Solution Approach 1:
The patent segments the color image into separate red, green, and blue sub-images that are projected in sequential fields. By processing and warping each color field independently based on its specific timing within the field sequence, the system avoids color break-up artifacts while maintaining manageable system complexity through modular processing.
Solution Approach 2:
The system dynamically changes warping parameters for each color field based on the predicted head pose at the time of projection. By adjusting geometric transformation parameters individually for each color sub-image rather than applying a single static warp, the display maintains image quality without requiring complete system redesign.
3Stability of the object's composition
If the system warps color fields based on predicted head poses at different times, then image stability is improved, but processing time increases
Solution Approach 1:
The system performs warping operations in advance based on predicted head poses before the actual projection occurs. By pre-calculating the necessary geometric transformations and preparing warped color sub-images ahead of time, the system reduces real-time processing requirements and maintains image stability without significant time penalty.
Solution Approach 2:
The patent implements periodic warping adjustments synchronized with the field sequential projection cycle. By applying warping transformations at regular intervals corresponding to each color field projection, the system maintains stable images while using efficient periodic processing rather than continuous computation.
Data Source
AI summary
Embodiments provide a computer implemented method for warping multi-field color virtual content for sequential projection. First and second color fields having different first and second colors are obtained. A first time for projection of a warped first color field is determined. A first pose corresponding to the first time is predicted. For each one color among the first colors in the first color field, (a) an input representing the one color among the first colors in the first color field is identified; (b) the input is reconfigured as a series of pulses creating a plurality of per-field inputs; and (c) each one of the series of pulses is warped based on the first pose. The warped first color field is generated based on the warped series of pulses. Pixels on a sequential display are activated based on the warped series of pulses to display the warped first color field.