Stylus Tip Status Verification via Electrostatic Coupling
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Solution Overview
Problem
Digitizer systems often experience errors where the stylus incorrectly identifies its tip status as 'touch' when no force is applied, leading to 'inking in hover' issues, due to mechanical problems requiring external calibration.
Innovation Solution
The stylus and digitizer sensor collaborate to verify the tip status, with the sensor sending notifications to correct errors, allowing the stylus to recalibrate its pressure sensor and the system to adjust accordingly, using wireless communication channels like electrostatic or Bluetooth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the stylus uses a mechanical pressure sensor to detect tip contact, then pressure sensitivity is improved, but mechanical failures cause false 'touch' readings when no force is applied
Solution Approach 1:
The patent introduces an electrostatic field-based detection mechanism as an intermediary to verify the mechanical pressure sensor's readings. The digitizer sensor detects electrostatic coupling between the stylus tip and the sensor surface, providing an independent verification channel that mediates the reliability issue of the mechanical sensor without compromising pressure sensitivity.
Solution Approach 2:
The system implements a feedback mechanism where the digitizer sensor continuously monitors electrostatic coupling and compares it with mechanical sensor readings. When discrepancies are detected (e.g., mechanical sensor indicates touch but electrostatic coupling is absent), the system receives feedback to correct the false reading, ensuring reliable tip status detection.
2Manufacturing precision
If external calibration equipment is used to correct mechanical sensor errors, then manufacturing precision is improved, but device complexity and calibration requirements increase
Solution Approach 1:
The patent enables the stylus-digitizer system to perform self-calibration using the electrostatic field detection mechanism. The system automatically detects and corrects calibration drift by comparing electrostatic coupling readings with mechanical sensor readings, eliminating the need for external calibration equipment and reducing device complexity while maintaining manufacturing precision.
3Measurement precision
If the system continuously monitors tip status to prevent inking in hover, then writing accuracy is improved, but energy consumption increases
Solution Approach 1:
The system implements periodic sampling of electrostatic coupling rather than continuous monitoring. The digitizer sensor checks for stylus presence and tip status at regular intervals during hover and writing operations, maintaining writing accuracy while significantly reducing energy consumption compared to continuous monitoring.
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 collaboration effectively resolves the 'inking in hover' problem by ensuring accurate tip status detection and recalibration, enhancing the reliability of stylus input in digitizer systems.
Implementation Method 1
a pressure sensor for detecting applied pressure on the tip
Implementation Method 2
Tracking is based on detecting a signal emitted by a tip of the stylus and picked up by the digitizer sensor due to electrostatic coupling established between the tip and a portion of the matrix of electrode junctions
Data Source
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Figure 2
Figure 3A
AI summary
A method for identifying an error in a tip status indication from a stylus includes detecting input from a stylus with a digitizer sensor via an electrostatic (ES) wireless communication channel established between said stylus and said digitizer sensor. An indication of a tip status is received from the stylus, indicating whether the tip status is in hover or touch. The tip status is verified based on input detected with the digitizer sensor. When an error is identified in the tip status indication, a notification of the error is sent.