Capacitive Touch Detecting Device With Segmented Drive Areas
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Solution Overview
Problem
Touch detecting devices face a trade-off between detection sensitivity, position detection accuracy, and detection speed, as increasing the number of detection circuits and electrodes can slow down detection processes.
Innovation Solution
A capacitive touch detecting device with a first and second drive area, each containing drive and detection electrodes, where the electrodes are arranged orthogonally and applied with drive signals in a specific timing pattern to minimize interference and enhance detection speed while maintaining sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of detection circuits and electrodes is increased to improve detection sensitivity and position detection accuracy, then the detection speed decreases due to increased detection time and drive time
Solution Approach 1:
The touch detecting device is divided into multiple drive areas (first drive area and second drive area), each with its own drive electrodes and detection electrodes. This segmentation allows independent control and detection in different regions, enabling parallel processing that increases detection speed while maintaining position detection accuracy through the distributed electrode arrangement.
Solution Approach 2:
The patent implements periodic driving of detection electrodes in alternating patterns between the first and second drive areas. By periodically switching which drive area is actively driven and which is in detection mode, the system achieves high detection speed through time-division multiplexing while maintaining accurate touch detection through systematic scanning of all electrode regions.
2Reliability
If the number of detection circuits and electrodes is increased to improve detection sensitivity, then the detection time increases, thereby decreasing the detection speed
Solution Approach 1:
The detection system is segmented into multiple independent drive areas with separate detection circuits. Each drive area can be detected independently and in parallel, reducing the total detection time required to scan the entire touch surface while maintaining high detection sensitivity through the distributed sensor architecture.
Solution Approach 2:
While one drive area is being driven, another drive area is being detected, and vice versa. This continuous alternating operation ensures that detection actions are continuously performed across the entire touch surface without idle periods, reducing overall detection time while maintaining sensitivity through uninterrupted monitoring of all regions.
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
The solution allows for accurate and sensitive touch detection while increasing detection speed by minimizing interference between drive areas and optimizing the timing of drive signal application.
Implementation Method 1
outputting a detection signal serving as a signal corresponding to a change in capacitance generated between the detection electrodes and the drive electrodes
Data Source
AI summary
According to an aspect, a touch detecting device includes: a first drive area and a second drive area each including drive electrodes and detection electrodes, the drive electrodes extending in a first direction, being arrayed in a second direction intersecting with the first direction, and being applied with a drive signal, the detection electrodes extending in the second direction, being arrayed in the first direction, and outputting a detection signal. Application of the drive signal to the drive electrodes in the second drive area is stopped at a timing to apply the drive signal to the drive electrodes arranged in a first predetermined area included in the first drive area, and application of the drive signal to the drive electrodes in the first drive area is stopped at a timing to apply the drive signal to a second predetermined area included in the second drive area.