Stylus Transmission Electrode for False Touch Filtering
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Solution Overview
Problem
Existing electronic devices struggle to differentiate between false touch areas caused by the palm or wrist when holding an active stylus and normal finger operations on a touch panel, leading to incorrect touch coordinate reporting.
Innovation Solution
Incorporating transmission electrodes on the stylus and touch device to transmit suppressing report signals to ignore false touch areas and downlink signals to accurately identify stylus placement on the touch panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch device uses the existing touch panel to detect all touch contacts, then the touch detection coverage is complete, but false touch events from palm or wrist contact are incorrectly reported
Solution Approach 1:
The touch detection system is segmented into two independent parts: the touch panel detects all contact points while the first transmission electrode on the holding portion identifies palm/wrist contact. By dividing the detection function between these two components, the system can distinguish true stylus touches from false palm touches, resolving the contradiction between complete detection coverage and accurate event identification.
Solution Approach 2:
The first transmission electrode acts as an intermediary that transmits a first downlink signal indicating palm or wrist contact. This intermediary signal allows the touch processing circuit to filter false touch events without affecting the completeness of touch panel detection, thereby maintaining both detection coverage and accuracy.
2Productivity
If the touch device reports all detected touch coordinates, then the touch response is comprehensive, but stylus placement events are incorrectly reported as normal touches
Solution Approach 1:
The first transmission electrode performs preliminary detection of palm or wrist contact before the touch panel processes the touch event. By transmitting the first downlink signal in advance, the system pre-identifies false touch areas, allowing the touch processing circuit to reliably distinguish stylus placement events from normal touches while maintaining efficient event reporting.
3Measurement precision
If the touch device adds signal transmission components to the stylus, then the ability to identify false touch areas improves, but the stylus structure becomes more complex
Solution Approach 1:
The first transmission electrode on the holding portion serves multiple functions: it transmits the first downlink signal for false touch area identification and can also participate in touch detection. By making this component multi-functional, the system improves false touch detection accuracy without adding excessive complexity to the stylus structure.
Data Source
AI summary
A stylus, a touch device, and a touch processing circuit are provided. The stylus includes a holding portion and a first transmission electrode. The first transmission electrode is disposed on the holding portion. The touch device includes a touch panel and a touch processing circuit. The touch processing circuit is coupled to the touch panel. The first transmission electrode transmits a first downlink signal to the touch device. The first downlink signal is used to determine a touch event that the stylus is laid on the touch panel. The touch processing circuit receives at least one first downlink signal from the holding portion of the stylus through the touch panel. The touch processing circuit is configured to determine the touch event that the stylus is laid on the touch panel based on the first downlink signal.