Tunable VCSEL and HCG Grating for 3D Gaze Mapping
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Solution Overview
Problem
There is a need for improved systems and methods to receive a three dimensional (3D) map of at least a part of a body of a user, particularly for applications involving hand tracking and user monitoring.
Innovation Solution
A mobile device equipped with tunable VCSELs and an HCG grating, which emits light to capture 3D map data of a user's body, including their head and gaze direction, by analyzing light reflected off the eye.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If VCSELs are used to capture 3D map data, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The VCSEL system is designed to perform multiple functions: capturing 3D map data, identifying gaze direction, and extracting head coordinates using the same hardware platform. This multi-functionality approach allows the system to achieve high measurement precision across multiple tasks without proportionally increasing device complexity
Solution Approach 2:
The system uses tunable VCSELs that can change wavelength parameters to capture different types of data (structural 3D map, reflected light patterns for gaze detection). By changing operational parameters rather than adding separate hardware components, the system maintains measurement precision while controlling complexity
2Adaptability or versatility
If HCG grating is used for wavelength tuning, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The system replaces mechanical wavelength tuning mechanisms with an HCG (high-contrast grating) based optical approach. The HCG grating provides wavelength selectivity through its periodic structure, enabling adaptable wavelength selection without mechanical moving parts, thereby reducing manufacturing complexity while maintaining precision
Solution Approach 2:
The HCG grating structure is designed with adjustable parameters that allow dynamic wavelength tuning. By modifying the grating period, depth, or fill factor, the system can adapt to different wavelength requirements, providing versatility while the grating fabrication processes are optimized to meet precision requirements
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 system effectively identifies the direction of a user's gaze and extracts 3D coordinates of a user's head, enabling precise tracking and interaction within a controlled environment.
Implementation Method 1
A light emitting device is included with tunable VCSEL laser with one or more active regions having quantum wells and barriers
Implementation Method 2
The VCSEL laser includes an HCG grating and a bottom DBR
Implementation Method 3
one or more active regions having quantum wells and barriers
Implementation Method 4
identify a direction of a user's gaze by analyzing light reflected off an element of the eye
Data Source
AI summary
An apparatus is provided to receive a three dimensional (3D) map of at least a part of a body of a user. A light emitting device is included with tunable VCSEL laser with one or more active regions having quantum wells and barriers. The active regions are surrounded by one or more p-n junctions. The one or more active regions can include a selected shape structure one or more tunnel junction (TJ) 20s provided. One or more apertures are provided with the selected shape structure. One or more buried tunnel junctions (BTJ) or oxide confine the apertures, additional TJ's, planar structures and or additional BTJ's created during a regrowth process that is independent of a first growth process. A VCSEL output is determined in response to an application of the VCSEL laser. The VCSEL laser includes an HCG grating and a bottom DBR. A user monitoring device 100 includes the VCSEL laser. A user monitoring device that includes the VCSEL laser 10. The light emitting device is included in a camera of a communication device.