Stylus–Host Synchronization via Capacitive Array Magnetic Fields
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing capacitive touch screens face challenges in synchronizing active styluses effectively, leading to inefficiencies in operation and increased scanning times due to the need for additional inductive tracking layers.
Innovation Solution
The integration of a magnetic field generation system using electrodes in capacitive sense arrays to synchronize the operation of active styluses, eliminating the need for separate inductive tracking layers by using a magnetic field detection mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate inductive tracking layers are added to capacitive touch screens for stylus synchronization, then stylus tracking capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the inductive tracking function with the existing capacitive sense array by having the same electrodes perform both capacitive sensing and magnetic field generation for stylus tracking. This eliminates the need for separate inductive tracking layers while maintaining stylus synchronization capability.
Solution Approach 2:
The electrodes in the capacitive sense array are designed to serve multiple functions: capacitive touch sensing and inductive stylus tracking through magnetic field generation. This multi-functionality reduces overall device complexity by eliminating dedicated separate layers.
2Reliability
If additional inductive tracking layers are implemented for active stylus synchronization, then stylus operation reliability is improved, but scanning time increases
Solution Approach 1:
By combining capacitive sensing and inductive tracking into a single electrode system, the patent enables simultaneous operation of both functions without sequential scanning delays, thereby reducing overall scanning time while maintaining synchronization reliability.
3Reliability
If separate inductive tracking layers are added, then magnetic field detection for stylus synchronization is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines magnetic field generation and detection functions with the existing capacitive electrode structure, eliminating the need for separate inductive tracking layers and associated manufacturing processes, thereby reducing manufacturing cost while maintaining detection capability.
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 reduces scanning time and enhances operational efficiency by allowing direct capacitive coupling between the stylus and the sense array, improving synchronization and reducing the reliance on high-impedance paths.
Implementation Method 1
the capacitive sense array is configured to transmit an electrical signal or current through a plurality of electrodes and generate a magnetic field using the plurality of electrodes
Implementation Method 2
the stylus may detect the magnetic field generated by the capacitive sense array and may synchronize its operation to the operation of a host, using the magnetic field
Implementation Method 3
The stylus may capacitively couple a transmit (TX) signal to the capacitive sense array
Data Source
AI summary
A system and method for synchronizing a stylus to a capacitive sense array. The system including a capacitive sense array which includes a plurality of electrodes. A magnetic field is generated using the plurality of electrodes. The magnetic field is used to synchronize the operation of the stylus and the capacitive sense array.