HMD Distortion Unit Architecture for Low-Latency Image Correction
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Solution Overview
Problem
Head-mounted displays (HMDs) face challenges with latency and distortion issues due to the proximity of the display surface to the wearer's eyes, leading to motion sickness and the need for wide-angle views, which existing graphics processing systems address inefficiently.
Innovation Solution
A low latency distortion unit separate from the graphics processing unit performs distortion mapping and filtering on pixel data, reducing latency and improving efficiency by using hardware logic optimized for distortion correction and motion compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distortion mapping is performed using standard graphics processing unit, then image distortion correction is achieved, but processing latency increases and rendering efficiency decreases
Solution Approach 1:
The patent separates the distortion mapping function from the general-purpose graphics processing unit by implementing a dedicated hardware distortion unit. This segmentation allows the distortion correction to be performed independently with specialized circuitry, avoiding the overhead of general GPU processing and reducing latency while maintaining correction accuracy.
Solution Approach 2:
The patent introduces a dedicated distortion unit as an intermediary component between the graphics processing unit and the display. This intermediate hardware layer handles the distortion mapping specifically, acting as a mediator that optimizes the processing pipeline by dedicating specific hardware resources to the distortion correction task.
2Adaptability or versatility
If wide field of view is provided using lenses, then viewing angle is improved, but motion artifacts increase due to latency
Solution Approach 1:
The patent applies distortion mapping in advance to the image data before it is displayed, using a dedicated hardware unit that can process the distortion correction quickly. This preliminary action ensures that the distorted image is pre-corrected, allowing the lenses to provide wide field of view without introducing motion artifacts during head movement.
3Device complexity
If standard projection is used for rendering, then graphics processing is simplified, but image quality deteriorates when viewed through HMD optical arrangement
Solution Approach 1:
The patent divides the graphics processing pipeline into two distinct stages: standard rendering using the graphics processing unit, and distortion mapping using a dedicated hardware distortion unit. This segmentation allows the rendering process to remain simple while the distortion correction is handled by specialized hardware, ensuring image quality without increasing overall system complexity.
Data Source
AI summary
A graphics processing system for a head mounted display (or other non-standard projection display) comprises a low latency distortion unit which is separate from a graphics processing unit in the graphics processing system. The low latency distortion unit receives pixel data generated by the graphics processing system using a standard projection and performs a mapping operation to introduce distortion which is dependent upon the optical properties of the optical arrangement within the head mounted display. The distorted pixel data which is generated by the low latency distortion unit is then output to the display in the head mounted display.