Stylus Orientation Detection via Simultaneous Tip-Wire Signal Processing
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Solution Overview
Problem
Existing methods for detecting the tilt angle of a stylus require excessive signal synchronization, complex touch controller operations, and extended touch detection durations, making them inefficient and cumbersome.
Innovation Solution
The conductive tip and wire module of the stylus transmit signals simultaneously and at the same frequency, allowing for simultaneous scanning and processing of capacitive sense signals to determine the tilt angle without separate signal processing operations or additional synchronization, utilizing machine learning techniques to estimate orientation parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate signal processing operations are used for conductive tip and wire module, then signal synchronization can be achieved, but device complexity and touch detection duration increase
Solution Approach 1:
The patent merges the signal processing operations for the conductive tip and wire module into a single simultaneous processing operation. Both elements are driven by synchronized drive signals and processed through the same capacitive sense signals, eliminating the need for separate processing sequences and reducing controller complexity while maintaining signal synchronization.
Solution Approach 2:
The capacitive sense array and processing circuitry are designed to handle both tip and wire module signals universally through a single processing path. The system uses the same sense electrodes and processing logic to detect both elements, reducing the need for dedicated processing operations for each element type.
2Measurement precision
If separate signal processing operations are used for conductive tip and wire module, then signal differentiation is possible, but touch detection duration is extended
Solution Approach 1:
The system maintains continuous simultaneous driving of both tip and wire module throughout the detection process. Rather than alternating between processing different elements, both elements are driven continuously with synchronized signals, allowing orientation detection to proceed without interruption and reducing total detection time.
Solution Approach 2:
The tip and wire module are driven simultaneously with pre-synchronized drive signals before the actual orientation measurement begins. This preliminary simultaneous driving establishes the signal relationship in advance, allowing the processing stage to directly extract orientation information without requiring sequential processing steps.
3Measurement precision
If machine learning techniques are applied, then orientation parameter estimation accuracy improves, but processing complexity increases
Solution Approach 1:
The patent replaces complex geometric calculation and manual programming approaches with machine learning model-based estimation. The machine learning model automatically learns the relationship between capacitive sense signal patterns and orientation parameters from training data, substituting complex algorithmic processing with a trained model that provides accurate estimates through pattern recognition.
Solution Approach 2:
The machine learning model performs self-adjustment and optimization during the training phase, automatically incorporating the impact of additional information such as sensor sizes and response functions without requiring manual programming or measurement. The model adapts to specific sensor characteristics autonomously, reducing the need for manual calibration and complex processing setup.
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
This approach simplifies signal processing, reduces systemic errors, and enhances data accuracy, enabling efficient and accurate detection of stylus orientation parameters within a short touch scan time, thereby improving display quality and user experience.
Implementation Method 1
capacitive sense arrays can be found in cellular phones, GPS devices, set-top boxes, cameras, computer screens, MP3 players, digital tablets... The capacitances of these capacitive sense elements vary when an object (e.g., a finger, a hand, a stylus, or another object) comes into contact with or hovers above the touch sensing surface
Implementation Method 2
The conductive tip and wire module of the stylus transmit signals simultaneously and at the same frequency... Both the tip and wire drive signals have a single stylus drive frequency
Data Source
AI summary
An electronic device includes a capacitive sense array and is coupled to a stylus including a conductive tip and a conductive wire module. The conductive tip and wire module of the stylus are driven by a tip drive signal and a wire drive signal simultaneously. The tip and wire drive signals have a single stylus drive frequency. While the conductive tip and wire module are driven by the tip and wire drive signals, the electronic device scans the capacitive sense array to obtain a plurality of capacitive sense signals from a plurality of sense electrodes of the capacitive sense array. The electronic device generates a composite image of the capacitive sense array based on the plurality of capacitive sense signals and processes the composite image to determine one or more orientation parameters (e.g., a tilt angle) of the stylus with respect to a surface of the capacitive sense array.