Active Pen Electrode Layout for Tilt-Accurate Position Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional systems using active pens struggle with accurately detecting the position of pens on a panel surface, especially when tilted, and fail to allocate time slots efficiently based on pen functions, leading to incorrect position detection and interference from user hand contact.
Innovation Solution
A communication method between active pens and a sensor controller that includes a beacon signal for timing, functional information acquisition, and dynamic slot allocation, along with a pen design featuring a pen tip and peripheral electrodes to manage signal intensity and absorption, ensuring accurate position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sensor controller uses conventional beacon signals to designate time slots, then the basic communication framework is established, but the time slot allocation cannot be dynamically adjusted according to different active pen functions and capabilities
Solution Approach 1:
The patent implements dynamic time slot allocation where the sensor controller adjusts time slot assignments based on real-time detection of active pen functions and capabilities. The beacon signal now carries functional information about each pen's electrodes and detection capabilities, enabling the controller to dynamically optimize time slot distribution rather than using fixed allocation.
Solution Approach 2:
The system changes the parameters of time slot allocation based on detected pen characteristics. The beacon signal includes functional information that allows the sensor controller to modify allocation parameters such as the number of time slots assigned to each pen, the timing of downlink signals, and the configuration of measurement slots according to each pen's specific capabilities.
2Ease of operation
If the active pen is tilted with respect to the panel surface, then the pen can be used at various angles, but the peak of the reception intensity distribution shifts causing inaccurate position detection
Solution Approach 1:
The patent employs multiple electrodes with different functions positioned at specific locations on the active pen. The pen tip electrode detects position, while peripheral electrodes detect inclination and azimuth. Each electrode has a specialized local function that contributes to overall accurate detection even when the pen is tilted, compensating for the shift in reception intensity distribution.
Solution Approach 2:
The patent uses asymmetric electrode arrangements and different electrode configurations to detect and compensate for pen tilt. The peripheral electrodes are positioned asymmetrically around the pen tip, enabling the system to detect inclination angles and correct position detection errors that occur when the pen is held at angles other than perpendicular to the panel.
3Ease of operation
If the user's hand touches the panel surface while holding the active pen, then the user can maintain grip, but the downlink signal flows toward the hand causing false detection of the contact position
Solution Approach 1:
The patent segments the electrode functions into distinct roles: the pen tip electrode is dedicated to position detection, while separate peripheral electrodes handle inclination and azimuth detection. This segmentation allows the system to distinguish between signals from the pen tip contact and signals influenced by hand contact, preventing false detection of contact position.
Solution Approach 2:
The peripheral electrodes act as intermediaries that detect the pen's orientation and provide correction information. By detecting inclination and azimuth angles, these intermediary sensors enable the system to compensate for signal distortion caused by hand contact and accurately determine the true pen tip contact position on the panel.
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 method allows timely allocation of time slots based on pen capabilities and reduces signal interference from pen tilt and user hand contact, enhancing position detection accuracy.
Implementation Method 1
The active pen can be capacitively coupled to sensor electrodes provided on a panel surface (touch surface) of the tablet terminal to thereby transmit and receive signals to and from a sensor controller in the tablet terminal.
Data Source
AI summary
An active pen is provided that transmits, through coupling capacitance, a signal to a sensor electrode connected to a sensor controller. The active pen includes a pen tip electrode provided on a leading end in a pen axis direction of the active pen; a peripheral electrode provided behind in the pen axis direction as viewed from the pen tip electrode; and a signal processor that transmits a downlink signal from the pen tip electrode and that transmits a reverse-phase signal of the downlink signal from the peripheral electrode at the same time.