Mixed Reality Display Luminance Control for Dark Adaptation
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Solution Overview
Problem
Conventional mixed-reality devices compromise user vision in low-light or dark ambient lighting conditions by deactivating rods in the eyes, leading to temporary visual impairment and limited peripheral vision.
Innovation Solution
A mixed-reality device with an eye tracker that adjusts luminance levels of image frames based on the angle relative to the eye position and the anatomy of rods and cones in the eye, generating luminance-adjusted image frames to preserve dark adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mixed-reality devices display images with uniform high luminance, then visual acuity in the center field of view is improved, but rod photoreceptors are deactivated leading to loss of peripheral vision and temporary visual impairment in dark conditions
Solution Approach 1:
The patent applies local quality by differentiating luminance treatment across different regions of the visual field. Central regions (fovea) receive full luminance for high visual acuity, while peripheral regions receive reduced or no luminance to preserve rod function. This spatial differentiation of quality allows simultaneous optimization of central vision and peripheral dark adaptation.
Solution Approach 2:
The patent segments the visual field into distinct zones based on photoreceptor distribution: a central foveal region dominated by cones requiring high luminance for acuity, and peripheral regions dominated by rods requiring low luminance for dark adaptation. This segmentation enables targeted luminance control that matches the functional requirements of each retinal zone.
2Object-affected harmful factors
If mixed-reality devices reduce overall luminance to preserve dark adaptation, then rod function is maintained, but visual acuity and image quality deteriorate
Solution Approach 1:
Instead of uniform luminance reduction, the patent applies local quality by maintaining high luminance only in the central foveal region where cones provide visual acuity, while reducing luminance in peripheral regions where rods dominate. This selective approach preserves both dark adaptation (through peripheral dimming) and visual acuity (through central brightness).
3Object-affected harmful factors
If mixed-reality devices limit peripheral vision to preserve dark adaptation, then rod deactivation is reduced, but field of view and spatial awareness are compromised
Solution Approach 1:
The patent changes the luminance parameter dynamically across the visual field rather than uniformly limiting the field of view. By adjusting luminance levels spatially (high in center, low in periphery) rather than restricting angular coverage, the system preserves the full field of view while protecting rod function through selective dimming of peripheral regions.
Data Source
AI summary
Examples are disclosed that relate to a mixed-reality device having improved dark adaptation to see in dark ambient lighting conditions. In one example, a mixed-reality device includes an eye tracker, a near-eye display, a logic subsystem, and a storage subsystem. The eye tracker is configured to determine a position of an eye. The storage subsystem holds instructions executable by the logic subsystem to generate an image frame including a plurality of pixels, wherein each pixel has a native luminance level, map the position of the eye to the image frame, adjust luminance levels of pixels of the image frame as a function of angle relative to the position of the eye mapped to the image frame and based at least on a rod and cone anatomy of the eye to generate a luminance-adjusted image frame, and render, via the near-eye display, the luminance-adjusted image frame.