Stylus Receive Architecture for Position Determination
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Solution Overview
Problem
Existing systems for determining the position of a stylus with respect to an electronic device are hindered by noise, particularly in touch sensor assemblies that use on-cell touch technology, which can obscure voltage changes and reduce accuracy.
Innovation Solution
The system employs a stylus with capacitive receive architecture that senses device stimulation signals transmitted by the electronic device, allowing the stylus to communicate these signals wirelessly back to the device for estimating its position, using multiple receive electrodes and processing techniques like multi-stimulation and quadrature scans to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the stylus uses voltage changes to determine position, then position determination is enabled, but noise obscures the voltage changes and reduces accuracy
Solution Approach 1:
Instead of the stylus transmitting voltage changes to the device (traditional approach), the patent inverts the architecture so the device transmits stimulation signals and the stylus receives and senses them. This receive architecture at the stylus eliminates the need for the stylus to generate signals, thereby improving noise immunity and position determination accuracy.
Solution Approach 2:
The patent introduces device stimulation signals as an intermediary medium. Rather than directly measuring voltage changes from the stylus, the system uses device-generated stimulation signals that are sensed by the stylus, providing a cleaner reference signal that is less susceptible to noise interference.
2Measurement precision
If multiple receive electrodes and processing techniques are used, then noise immunity and accuracy improve, but device complexity increases
Solution Approach 1:
The patent divides the sensing function into multiple receive electrodes on the stylus, with each electrode contributing to the overall position determination. This segmentation allows for more accurate position and orientation detection through signal processing techniques like multi-stimulation and quadrature scans, while distributing the complexity across multiple simple sensing elements rather than one complex sensor.
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 provides better noise immunity and accurate determination of the stylus's position, orientation, and movement relative to the electronic device's input surface, enhancing user interaction and input precision.
Implementation Method 1
executing a relationship scan using a capacitive coupling interface between the stylus and the electronic device, wherein the capacitive coupling interface includes the stylus capacitive receive architecture
Data Source
AI summary
Systems, methods, and computer-readable media for enabling position determination of a stylus with receive architecture are provided. The stylus can comprise: a plurality of electrodes; a plurality of sensing circuits coupled to the plurality of electrodes, the plurality of sensing circuits configured to sense receive signals on the plurality of electrodes in response to stimulation signals from a touch sensor panel of an electronic device in communication with the stylus; and a processor coupled to the plurality of sensing circuits, the processor configured to: correlate the receive signals sensed by the plurality of electrodes with a first set of codes to generate correlation data; and transmit data including the correlation data or generated using the correlation data to the electronic device in communication with the stylus.