Stylus Tilt Angle Detection via Modulated Electrical Signals
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Solution Overview
Problem
Current styluses lack the capability to accurately detect the tilt angle and axial direction with respect to touch screens, limiting user control options and input selections.
Innovation Solution
A touch control apparatus comprising a stylus with a first electrode at its tip and a second electrode surrounding it, along with a sensing circuit and processing module, which emits and receives electrical signals in specific modulation sequences to determine the tilt angle by calculating signal strengths and processing the information to determine the tilt angle and axial direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a stylus uses only basic touch contact without active signal emission, then the device complexity is reduced, but the measurement precision of tilt angle and axial direction is insufficient
Solution Approach 1:
The patent replaces passive mechanical touch contact with an active electromagnetic signal emission system. The stylus contains electrodes that emit electrical signals and a control circuit that processes modulation sequences, substituting simple mechanical interaction with an electromagnetic field-based detection system to enable precise tilt angle and axial direction measurement
Solution Approach 2:
The patent changes the operational parameters of the stylus by implementing time-varying signal emission patterns. The control circuit selectively emits electrical signals during different time periods based on detected axial direction, creating temporal parameter variations that encode directional information into the signal emission pattern for accurate tilt angle detection
2Measurement precision
If the stylus emits electrical signals in multiple time periods with different modulations, then the measurement precision of axial direction and tilt angle is improved, but the loss of time for signal processing increases
Solution Approach 1:
The patent implements periodic signal emission with distinct modulation sequences in different time periods. The control circuit emits electrical signals alternately during first and second time periods, with each period using different modulation patterns that correspond to different axial directions, enabling the touch control apparatus to decode precise directional information through temporal signal analysis
Solution Approach 2:
The system employs feedback mechanisms where the touch control apparatus receives electrical signals from the stylus, processes the modulation sequences to determine axial direction and tilt angle, and uses this information to control signal emission timing. This closed-loop feedback optimizes the signal detection process and reduces overall processing time
3Adaptability or versatility
If the touch control apparatus processes modulation sequences from multiple time periods, then the adaptability of control options is enhanced, but the device complexity of the control system increases
Solution Approach 1:
The patent segments the signal processing function into distinct modules within the touch control apparatus. The processing circuit separates the tasks of receiving electrical signals, determining modulation sequences, calculating axial direction, and determining tilt angle into independent processing stages, allowing each module to handle specific aspects of the complex control logic without requiring complete system redesign
Solution Approach 2:
The touch control apparatus is designed with multi-functional capabilities to handle various modulation sequences and signal patterns from the stylus. The processing circuit can interpret different time-period signal combinations and generate corresponding control options, making the system universally adaptable to multiple input modes while managing complexity through integrated design
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
Enables more precise control and input options by accurately detecting the tilt angle and axial direction of the stylus, enhancing user experience and providing additional control functions.
Implementation Method 1
a first electrode at a tip of the stylus and a second electrode surrounding the first electrode... instructing the first electrode to emit an electrical signal; instructing the second electrode to emit an electrical signal
Implementation Method 2
The sensing circuit is connected to a touch panel which includes a plurality of first touch sensitive electrodes and a plurality of second touch sensitive electrodes... instructing the sensing circuit to receive electrical signals emitted by the stylus
Data Source
AI summary
The present application provides a touch control apparatus for detecting a tilt angle of a stylus emitting electrical signals. A processing module of the touch control apparatus is configured for instructing a signal strength detecting circuit to calculate magnitudes of signal strengths of electrical signals in two time periods to determine a modulation sequence. The modulation sequence includes a plurality of modulations, in each of the time periods one type of the plurality of modulations is used. And the processing module is further configured for determining the tilt angle of the stylus based on the electrical signals of the two time periods.