Non-uniform resolution headworn display for large field of view
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Solution Overview
Problem
Current headworn display systems face challenges in achieving a large field-of-view (FOV) with high pixel density and 20/20 visual acuity due to enormous data rate requirements and limitations in available microdisplay technology, leading to compromises in either pixel size or FOV.
Innovation Solution
Designing a display system with a non-uniform distribution of pixel sizes, where pixels in the central foveal region have a size compatible with 20/20 vision and progressively larger sizes further away, reducing the overall number of pixels needed and thus the computational load and data rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If uniform high pixel density is maintained across the entire display to achieve 20/20 visual acuity, then visual resolution is improved, but data rate requirements become enormous (22.15 Gbps) and impractical for portable devices
Solution Approach 1:
The patent applies local quality by varying pixel density across different regions of the display. High pixel density is concentrated in the central foveal region where visual acuity is most sensitive, while peripheral regions use lower pixel density. This resolves the contradiction by maintaining 20/20 visual acuity where needed without requiring uniform high density across the entire large FOV, thereby reducing the enormous data rate requirement to a practical level.
Solution Approach 2:
The patent segments the display into multiple resolution zones: a high-resolution central region and lower-resolution peripheral regions. This segmentation allows the system to allocate computational and bandwidth resources selectively, improving visual resolution in the critical central area while reducing overall data rate requirements by using coarser sampling in peripheral areas where human vision is less sensitive.
2Area of stationary object
If display size is increased to achieve a large field-of-view (100° diagonal) with uniform pixel density, then FOV is improved, but the number of pixels required (5250×2950) exceeds current microdisplay technology capabilities
Solution Approach 1:
The patent applies local quality by concentrating high pixel density in the central foveal region and reducing pixel density in peripheral regions. This allows the display to achieve a large 100° diagonal FOV without requiring an impractically high total pixel count of 5250×2950, as the reduced peripheral density significantly lowers the overall pixel requirement while maintaining perceived visual quality.
Solution Approach 2:
The patent segments the large FOV display into a high-resolution central region and lower-resolution peripheral regions. This segmentation enables the system to achieve a large overall FOV area while keeping the pixel count within current microdisplay technology capabilities by using non-uniform sampling density across different spatial zones.
3Measurement precision
If uniform high pixel density is used across the entire display, then visual acuity is improved, but power consumption and computational load become prohibitively high
Solution Approach 1:
The patent applies local quality by maintaining high pixel density only in the central foveal region where visual acuity is most critical, while using lower pixel density in peripheral regions. This resolves the contradiction by preserving 20/20 visual acuity in the most sensitive viewing area without requiring uniform high density across the entire display, thereby significantly reducing power consumption and computational load.
Solution Approach 2:
The patent applies partial action by providing high visual resolution only where it is most needed (central foveal region) rather than uniformly across the entire display. This partial application of high pixel density maintains visual acuity in the critical central area while reducing overall computational load and power consumption by using lower resolution in peripheral areas where full acuity is less critical.
Data Source
AI summary
A display system includes a rendering engine, a display driver, an image source, and display optics. The rendering engine receives a non-uniform resolution distribution pattern and generates one or more rendered pixels. The display driver receives the one or more rendered pixels and generates one or more display driver pixels. The image source device receives the one or more display driver pixels and generates an image. And the display optics receives the image and provides a display optics image having a space-variant resolution that follows the non-uniform resolution distribution pattern.