VR Pen Tracking with 3D Posture and Precise Edge Detection
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Solution Overview
Problem
Existing technologies face issues with reduced precision and response speed in detecting the position coordinates and inclination of electronic pens, particularly in peripheral regions of sensors, and these problems are not adequately addressed by existing methods.
Innovation Solution
An input device that includes a sensor, detection circuit, processors, and memory devices to detect positions in both two- and three-dimensional spaces, allowing for the output of position coordinates and posture information, such as inclination and rotation, of an electronic pen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a plurality of loop coils are used to detect position coordinates and inclination angle, then position detection coverage is expanded, but measurement precision deteriorates in peripheral regions
Solution Approach 1:
The patent transitions from two-dimensional loop coil sensing to three-dimensional electromagnetic field sensing by introducing a Z-axis component. The sensor detects position coordinates (X, Y) and inclination angle (θ) simultaneously using electromagnetic induction in three dimensions, allowing accurate measurement even when the pen is held at angles away from the input surface.
Solution Approach 2:
The patent changes the detection parameters from simple two-dimensional position coordinates to include three-dimensional position information and inclination angle. By detecting signal levels from multiple loop coils and calculating both position and orientation parameters, the system maintains measurement precision across the entire sensor area including peripheral regions.
2Adaptability or versatility
If electromagnetic inductive coupling is used for signal exchange, then position and inclination detection is enabled, but response speed decreases
Solution Approach 1:
The system performs preliminary signal exchange to establish electromagnetic coupling between the pen and sensor before actual position detection. This allows the sensor to pre-configure its detection state, enabling faster response during subsequent position changes while maintaining both position and inclination detection capabilities.
3Device complexity
If sensor detects position in two-dimensional space only, then device complexity is reduced, but adaptability to three-dimensional drawing deteriorates
Solution Approach 1:
The patent makes the sensor system universal by enabling it to perform multiple detection functions simultaneously: two-dimensional position coordinates (X, Y), three-dimensional position (Z-axis), and inclination angle (θ). This multi-functionality is achieved through electromagnetic induction that can detect both planar and spatial orientation information from a single sensor array.
Solution Approach 2:
The system adds the Z-axis dimension to traditional two-dimensional position detection, enabling three-dimensional position tracking. By incorporating inclination angle detection through electromagnetic field analysis, the sensor can accurately track pen movements in three-dimensional space while maintaining relatively simple device architecture.
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 input device provides precise and responsive detection of pen positions and postures, enabling seamless transitions between two- and three-dimensional drawing and virtual reality environments without coordinate displacement or jumping movements.
Implementation Method 1
signals are exchanged between the electronic pen and the position detection device provided with the sensor through electromagnetic inductive coupling
Data Source
AI summary
Disclosed is a system that generates a virtual reality (VR) image. The system includes a device including a digitizer that, in operation, detects a position indicated by an electronic pen a tracking device that, in operation, detects a position of a tracker of the electronic pen for inputting a position in a VR space, the tracking device being positioned above the digitizer; and a computer that, in operation, generates a VR image of the electronic pen in the VR space based on a posture of the electronic pen in a three-dimensional space detected by tracking the tracker of the electronic pen using the tracking device, and the position indicated by the electronic pen detected by the digitizer.