Synchronization Signal for Correlated Touch Data Acquisition
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Solution Overview
Problem
Capacitive touch screens with multiple layers of mutual capacitance sensors face accuracy issues due to unequal pitch, leading to inconsistent cross-correlation of touch data between different sensing layers.
Innovation Solution
The implementation of a synchronization signal to drive and acquire data from multiple touch sensing units, ensuring synchronized operation between touch location and touch force sensing units, thereby correlating touch data effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple layers of mutual capacitance sensors are used with different pitches, then touch parameter detection capability is improved, but data cross-correlation accuracy deteriorates
Solution Approach 1:
The patent divides the touch sensing function into multiple independent sensing layers, each optimized for specific parameters (e.g., one layer for X-Y location, another for pressure). Each layer operates with its own drive and sense lines at its optimal pitch, allowing independent optimization while maintaining overall system functionality through the segmentation of sensing tasks across layers.
Solution Approach 2:
The patent introduces a synchronization signal as an intermediary mechanism that coordinates data acquisition timing across multiple sensing layers with different pitches. This synchronization signal acts as a mediator that enables consistent temporal correlation of touch events across layers, resolving the cross-correlation accuracy problem caused by pitch differences.
2Speed
If data acquisition from multiple sensing layers is performed independently, then acquisition speed is improved, but data consistency deteriorates
Solution Approach 1:
The patent implements periodic data acquisition cycles synchronized by a common synchronization signal that periodically triggers simultaneous sampling across all sensing layers. This periodic action ensures that while each layer can operate at its own high speed, the data from different layers remains consistently correlated through regular synchronized acquisition events.
Solution Approach 2:
The patent employs feedback mechanisms where the synchronization signal coordinates the timing of drive line activation and sense line reading across multiple layers. This feedback-based synchronization ensures that data acquisition from different layers occurs in a coordinated manner, maintaining data consistency while allowing each layer to operate independently at optimal speeds.
Data Source
AI summary
Disclosed herein is an electronic device including a first touch circuit to be coupled to a first touch sensing unit, the first touch sensing unit having first drive lines and first sense lines intersecting the first drive lines. A second touch circuit is to be coupled to a second touch sensing unit, the second touch sensing unit having second drive lines and second sense lines intersecting the second drive lines. A touch force circuit is to be coupled to a touch force sensing unit, the touch force sensing unit having third drive lines and third sense lines intersecting the third drive lines. The first touch circuit, second touch circuit, and touch force circuit are configured to drive the first, second, and third drive lines as a function of a synchronization signal, and acquire data from the first, second, and third sense lines as a function of the synchronization signal.