Wearable Display FOV Expansion via Color Channel Offset
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Solution Overview
Problem
Wearable display systems face limitations in expanding the field of view (FOV) due to the tradeoff between image resolution, quality, and weight, with compact planar optics often restricting the FOV and color range, especially at the edges.
Innovation Solution
The use of binocular summation phenomenon to expand the overall perceived FOV by offsetting the FOV of certain color channels for each eye, allowing the human brain to compensate for limited color ranges at the edges by utilizing complementary color information from the other eye, achieved through pupil-replicating waveguide assemblies that offset the FOV of color channels in opposite directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If compact planar optical components are used to reduce size and weight of optics block, then weight and complexity are reduced, but field of view and color range are limited
Solution Approach 1:
The patent divides the color spectrum into multiple segments (blue, green, red color channels) and assigns each to separate waveguide assemblies. Each waveguide assembly can be independently optimized for its specific color range, allowing compact design while collectively providing a broader field of view when the assemblies are combined in the display system.
2Area of stationary object
If wider field of view is implemented, then immersion experience is improved, but weight and complexity of optics block increase
Solution Approach 1:
The display system is segmented into multiple specialized waveguide assemblies, each handling a specific color channel. This segmentation allows each component to be simpler and more compact, while the system as a whole achieves wider field of view through the combination of multiple assemblies working together.
3Area of stationary object
If FOV of color channels is offset in opposite directions for left and right eyes, then overall perceived FOV is expanded, but color range at edges may be limited for individual eye
Solution Approach 1:
The patent merges the visual information from both eyes through binocular summation. Color information that is offset or limited in one eye's field of view is compensated by the complementary color information from the other eye, resulting in complete color perception when the brain combines both inputs.
Solution Approach 2:
Different color channels are distributed with different spatial qualities across the field of view. The blue channel may be optimized for certain angular ranges while the red channel covers complementary ranges, with each color channel having its own optimal viewing zone that together provides comprehensive color coverage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively increases the FOV of wearable displays while maintaining overall color perception, allowing for a wider field of view without significant increases in weight or complexity, enabling greater immersion in virtual or augmented reality environments.
Implementation Method 1
The use of binocular summation phenomenon to expand the overall perceived FOV by offsetting the FOV of certain color channels for each eye
Implementation Method 2
a first pupil-replicating waveguide assembly for displaying first and second color channels of the first image to the left eye, such that a field of view for the first color channel of the first image is offset from a field of view for the second color channel of the first image
Data Source
AI summary
A display system is presented for displaying a color stereoscopic image comprising first and second images for user's left and right eyes respectively. A first display is configured for displaying first and second color channels of the first image to the left eye, such that a field of view of the first color channel of the first image is offset from a field of view of the second color channel of the first image in a first direction. A second display is configured for displaying first and second color channels of the second image to the right eye, such that a field of view of the first color channel of the second image is offset from a field of view of the second color channel of the second image in a second direction opposite to the first direction.