Pen-Type XR Controller LED Layout for Occlusion-Resistant Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tracking systems for XR controllers face challenges in accurately detecting the position and orientation of the controller due to LED obstruction by the user's hand and the high cost of using cameras with global shutters, which are necessary for high accuracy.
Innovation Solution
A pen-type controller design with strategically placed LEDs and a tracking system using cameras with rolling shutters, positioned to minimize distortion, allowing for accurate detection of the controller's position and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If LEDs are disposed on the controller surface for tracking, then the controller can be detected by the tracking system, but the LEDs become hidden by the user's hand making detection inaccurate
Solution Approach 1:
The patent applies dimensionality change by arranging LEDs not only on the pen portion but also on the grip portion, utilizing the longitudinal dimension of the controller. This spatial distribution ensures that at least one LED remains visible to the camera even when the user's hand obscures other LEDs, thereby maintaining detection accuracy despite hand obstruction.
2Measurement precision
If a camera with global shutter is used to eliminate video distortion, then detection accuracy is improved, but the system cost becomes high
Solution Approach 1:
The patent employs cheaper rolling shutter cameras instead of expensive global shutter cameras. By strategically arranging multiple LEDs on both the pen and grip portions, the system compensates for the distortion introduced by rolling shutters, enabling accurate tracking with lower-cost hardware.
Solution Approach 2:
The patent changes the spatial parameters of LED arrangement, placing LEDs at specific positions on the pen portion and grip portion. This parameter optimization allows the system to maintain detection accuracy even with rolling shutter distortion, as the LEDs are positioned to remain detectable despite the sequential scanning nature of rolling shutters.
3Reliability
If multiple LEDs are disposed on the controller to ensure visibility, then detection reliability is improved, but the device complexity increases
Solution Approach 1:
The patent segments the LED arrangement into two distinct regions: the pen portion and the grip portion. This segmentation allows the controller to maintain detection reliability through distributed LEDs while keeping the overall structure simple and intuitive, as the LED placements follow the natural segmented structure of the controller.
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 enables high-accuracy detection of the controller's position and orientation, even when LEDs are obscured, while reducing system costs by utilizing less expensive rolling shutters.
Implementation Method 1
a first light emitting part disposed at an end part of the grip portion which is closer to the axis direction (or the axis) of the pen portion than another end part of the grip portion
Data Source
AI summary
A pen-type controller includes a pen portion having a pen shape, a grip portion that intersects an axis direction of the pen portion, and a first light emitting part disposed at an end part of the grip portion, wherein the end part is closer to the axis of the pen portion than another end part of the grip portion.