Touch Apparatus Resonance Signal Acquisition via Segmented Electrode Activation
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Solution Overview
Problem
Existing touch apparatuses face challenges in quickly acquiring touch coordinates and improving the signal-to-noise ratio for effective touch detection, particularly when using a stylus pen.
Innovation Solution
A touch apparatus with a touch panel comprising first and second touch electrodes, where a touch driver applies driving signals with varying enable and disable levels to generate resonance signals and receive detection signals, allowing for efficient touch coordinate acquisition and object type determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous driving signals are applied to all touch electrodes to maintain resonance, then the resonance signal strength is improved, but the touch coordinate acquisition time increases and processing efficiency decreases
Solution Approach 1:
The touch electrode array is divided into multiple groups (first touch electrodes and second touch electrodes) that are activated in alternating time sections. During the first time section, driving signals are applied to first touch electrodes while second touch electrodes receive detection signals, and vice versa in the second time section. This segmentation allows resonance signal generation and touch coordinate detection to occur simultaneously in different electrode groups, reducing total acquisition time while maintaining sufficient resonance signal strength.
Solution Approach 2:
The system employs periodic alternating activation of different electrode groups in time sections. Driving signals are applied periodically to generate resonance, while detection signals are received in alternating periods. This periodic action ensures continuous resonance maintenance across the touch panel while enabling time-multiplexed detection of touch coordinates, thereby reducing overall detection time without compromising signal quality.
2Reliability
If driving signals are applied to generate strong resonance signals, then the signal strength is improved, but the noise level increases and signal-to-noise ratio deteriorates
Solution Approach 1:
The system extracts and separates the detection signal reception from the driving signal application in time. During time sections when driving signals are applied to generate resonance, detection signals are not received from those same electrodes. Instead, detection is performed on alternating electrode groups during their designated detection time sections. This extraction of detection from the driving process eliminates noise from simultaneous signal generation and detection, improving signal-to-noise ratio while maintaining adequate signal strength through the alternating resonance excitation.
Solution Approach 2:
The system applies preliminary anti-action by preventing the reception of detection signals during the time sections when driving signals are actively generating resonance. This preemptive separation avoids the introduction of noise and interference that would occur if detection were performed simultaneously with strong driving signal application. By anticipating and preventing the harmful interaction between driving and detection signals, the system maintains high signal-to-noise ratio while still achieving sufficient resonance signal strength through alternating excitation cycles.
3Area of stationary object
If all touch electrodes are activated simultaneously for detection, then the detection coverage is improved, but the processing complexity and time consumption increase
Solution Approach 1:
The touch electrode array is segmented into multiple groups (first and second touch electrodes) that are activated and detected in alternating time sections. This segmentation reduces the number of electrodes actively processed at any given moment, thereby reducing processing complexity and time consumption. Despite this segmentation, complete detection coverage is maintained because all electrode groups are systematically activated across different time sections, ensuring that the entire touch panel area is monitored without requiring simultaneous processing of all electrodes.
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
Enables rapid acquisition of touch coordinates along intersecting axes and secure touch signal processing time, enhancing the signal-to-noise ratio for accurate touch detection.
Implementation Method 1
a touch driver that applies a first driving signal for generation of a resonance signal of a stylus pen to the touch panel in a first section
Data Source
AI summary
A touch apparatus according to an exemplary embodiment includes: a touch panel that includes a plurality of first touch electrodes extending in a first direction and arranged in a second direction that crosses the first direction, and a plurality of second touch electrodes extending in the second direction and arranged in the first direction; and a touch driver that applies a first driving signal for generation of a resonance signal of a stylus pen to the touch panel in a first section, and receives a detection signal from the plurality of first touch electrodes and the plurality of second touch electrodes in a second section that is next to the first section.