Programmable Light Source for Accurate Eye Tracking
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Solution Overview
Problem
Current eyeball tracking technologies in virtual reality display systems face inaccuracies due to constant winking, pupil reflex glints being covered, and interference from eyelashes or eye accessories, leading to reduced accuracy in eye tracking.
Innovation Solution
An object tracking apparatus comprising a lens, a light splitting device, and a programmable light source with multiple sub-light sources that dynamically adjust light emission patterns to project detection light beams, enhancing accuracy through on-axis and off-axis detection methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single light source is used for eyeball tracking, then the device structure is simple, but the tracking accuracy is reduced due to obstructions from winking, eyelashes, or accessories
Solution Approach 1:
The light source is divided into multiple sub-light sources (first, second, third sub-light sources) that can be independently controlled. This segmentation allows the system to selectively activate specific light sources based on detection needs, improving tracking accuracy by providing multiple illumination angles while maintaining manageable device complexity through modular control
Solution Approach 2:
The system dynamically adjusts which sub-light sources are activated based on real-time detection requirements. The controller selectively turns on specific sub-light sources depending on the detection task (e.g., using off-axis light when on-axis light is blocked by winking or accessories), enabling adaptive response to changing conditions without requiring all light sources to be constantly active
2Measurement precision
If multiple light beams are projected to different positions of the light splitting device, then object detection accuracy is enhanced through on-axis and off-axis methods, but the light source control complexity increases
Solution Approach 1:
The light splitting device receives light beams at multiple distinct positions (first, second, third positions) corresponding to different optical paths. Each position is associated with specific sub-light sources, creating segmented detection channels that can be independently controlled to achieve both on-axis and off-axis detection methods
Solution Approach 2:
The light splitting device acts as an intermediary that distributes light from multiple sub-light sources to different optical paths. It receives light beams at multiple positions and directs them appropriately, enabling the system to switch between on-axis and off-axis detection modes without requiring complex mechanical reconfiguration of the entire optical system
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 improves the accuracy of object tracking by dynamically adjusting light emission patterns, allowing for precise detection of eyeball positions despite potential obstructions, thereby enhancing human-computer interaction in virtual reality systems.
Implementation Method 1
The lens generates and projects a detection light beam to an object
Implementation Method 2
The light splitting device receives at least one of the plurality of light beams and generates at least one reflection light beam to the lens
Data Source
AI summary
A head mounted display device, an object tracking apparatus and a method for tracking object thereof are provided. The object tracking apparatus includes a lens, a light splitting device, a programmable light source and an image extractor. The lens generates and projects a detection light beam to an object. The programmable light source has a plurality of sub-light sources. The sub-light sources respectively project a plurality of light beams to a plurality of positions of the light splitting device. The programmable light source receives a driving signal, and adjusts a light-on status of each of the sub-light sources according to the driving signal. The image extractor extracts a detection image from the object. Wherein, the light splitting device receives at least one of the light beams and generates at least one reflection light beam to the lens, and the lens generates the detection light beam accordingly.