Waveguide Eye Illumination for Head-Mounted Displays
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Solution Overview
Problem
Conventional head-mounted devices that illuminate the eye for gaze tracking or identity determination require multiple light sources, leading to increased costs, heat generation, and power consumption.
Innovation Solution
A device with a light source and a waveguide having multiple leakage points to redirect light for eye illumination, replacing the need for multiple light sources and reducing power consumption and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light sources are used to illuminate the eye, then the eye illumination effect is improved, but the power consumption increases
Solution Approach 1:
The waveguide is divided into multiple leakage points along its length, allowing a single light source to illuminate the eye from multiple locations. This segmentation of the waveguide structure enables distributed illumination without requiring multiple light sources, thus maintaining effective eye illumination while reducing power consumption.
Solution Approach 2:
The waveguide acts as an intermediary between the single light source and the eye, transporting light from the source through the waveguide to multiple leakage points. This intermediary structure allows one light source to effectively illuminate the eye from multiple positions, resolving the contradiction between illumination effectiveness and power consumption.
2Illumination intensity
If multiple light sources are used to illuminate the eye, then the eye illumination effect is improved, but the heat generation increases
Solution Approach 1:
The waveguide is segmented into multiple leakage points that distribute illumination along its length. This allows a single light source to provide effective eye illumination without the need for multiple heat-generating light sources, thus reducing overall heat generation while maintaining illumination effectiveness.
Solution Approach 2:
The waveguide serves as a thermal intermediary, conducting light from a single light source to multiple leakage points while isolating the heat generation to just one location. This reduces the total heat generated in the system compared to using multiple light sources, while still achieving effective eye illumination.
3Illumination intensity
If multiple light sources are used to illuminate the eye, then the eye illumination effect is improved, but the device cost increases
Solution Approach 1:
The waveguide is segmented into multiple leakage points to provide distributed eye illumination. This structural segmentation allows the system to achieve effective illumination from a single light source, reducing the number of required components and lowering device cost while maintaining illumination effectiveness.
Solution Approach 2:
The waveguide acts as an intermediary component that enables one light source to effectively illuminate the eye from multiple positions. This reduces the total component count compared to using multiple light sources, thereby reducing device complexity and cost while maintaining effective eye illumination.
4Illumination intensity
If multiple light sources are used to illuminate the eye, then the eye illumination effect is improved, but the number of components increases
Solution Approach 1:
The waveguide is segmented into multiple leakage points along its structure, enabling a single light source to illuminate the eye from multiple locations. This segmentation approach maintains effective illumination while reducing the total number of components by eliminating the need for multiple light sources and their associated mounting structures.
Solution Approach 2:
The waveguide serves as an intermediary that connects a single light source to multiple illumination points on the eye. This reduces the component count by consolidating multiple illumination functions into a single integrated structure, thereby simplifying the device while maintaining effective eye illumination.
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
The solution effectively illuminates the eye with reduced power consumption and heat generation, enabling efficient gaze tracking and identity determination while minimizing costs.
Implementation Method 1
a waveguide, optically coupled to the light source, to redirect the light to emit in a first direction from a plurality of leakage points
Implementation Method 2
a waveguide, optically coupled to the light source, to redirect the light to emit in a first direction from a plurality of leakage points
Data Source
AI summary
In one implementation, a device includes a frame to mount the device to a head. The device includes a light source, coupled to the frame, to generate light. The device includes a waveguide, optically coupled to the light source, to redirect the light to emit in a first direction from a plurality of leakage points, wherein, when the device is mounted to the head, the light is emitted in the first direction towards an eye to illuminate the eye.