Head-Mounted VR Eye Tracking With Diffractive Optical Patterns
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head-mounted virtual reality devices face issues of high calibration complexity and low calibration accuracy due to the use of multiple infrared emitting diodes, which lead to exposure of circuit boards, electrostatic interference, and increased assembly errors.
Innovation Solution
A head-mounted virtual reality device utilizing a light source and diffractive optical element to form a reflected pattern on the eyeball, reducing the number of light-emitting components and minimizing mutual interference, with a processor determining pupil coordinates for improved calibration accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple infrared emitting diodes are used for eye movement recognition, then the coverage area increases, but the circuit board size increases and assembly complexity increases
Solution Approach 1:
Multiple infrared emitting diodes are merged into a single infrared emitting diode, which projects infrared light to multiple eye positions through optical design. This reduces the number of components from multiple diodes to one, simplifying assembly while maintaining coverage area.
Solution Approach 2:
The single infrared emitting diode performs multiple functions by projecting infrared light to different eye positions through the optical system. One component achieves what previously required multiple specialized components, reducing circuit board size and assembly complexity.
2Reliability
If multiple infrared emitting diodes are arranged on the circuit board, then eye movement coverage is improved, but the circuit board becomes exposed and electrostatic interference increases
Solution Approach 1:
Multiple infrared emitting diodes are consolidated into one, reducing the number of exposed electronic components on the circuit board. This minimizes the circuit board's exposure and reduces susceptibility to electrostatic interference while maintaining eye movement recognition accuracy.
3Area of stationary object
If multiple infrared emitting diodes are used, then light coverage is improved, but mutual interference between light sources increases
Solution Approach 1:
Multiple light sources are merged into one infrared emitting diode, eliminating mutual interference between multiple light sources. The single light source projects infrared light to multiple eye positions through optical design, ensuring accurate eye movement recognition without interference.
Solution Approach 2:
An optical system acts as an intermediary between the single infrared emitting diode and multiple eye positions. The optical design directs light precisely to different eye locations, achieving wide coverage while preventing light interference through controlled optical paths.
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
Reduces the size of the circuit board, facilitates assembly, and enhances calibration accuracy by minimizing component exposure and interference, thereby improving eye movement recognition.
Implementation Method 1
a diffractive optical element which disperses the light source into a plurality of rays
Data Source
AI summary
The present disclosure provides a head-mounted virtual reality device, including an eye movement recognition assembly and a processor, where the eye movement recognition assembly includes a light source assembly and a first camera; the light source assembly includes a light source and a diffractive optical element, where the diffractive optical element is provided with a plurality of light-emitting holes, a first pattern is formed by the plurality of light-emitting holes, and the light source assembly is configured such that a first reflected pattern on an eyeball of a user is formed by light emitted by the light source assembly when the head-mounted virtual reality device is used; the first camera is configured to photograph a first eye picture of a user when the head-mounted virtual reality device is used, and the first eye picture includes at least part of the first reflected pattern.