ADS Array Substrate Common Electrode Touch Detection
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Solution Overview
Problem
Capacitive touch screens face issues with 'ghost points' during self-capacitance touch detection, leading to inaccurate multi-point touch recognition and prolonged detection times, which affect sensitivity and accuracy.
Innovation Solution
The ADS array substrate integrates common electrodes as touch electrodes, with signal lines connected to each touch electrode to transmit voltage and detect self-capacitance changes, ensuring unique detection signals for each touch point and simultaneous detection of multiple points, thereby avoiding 'ghost points' and improving sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If self-capacitance touch detection is used, then the structure is simple and easy to implement, but ghost points occur during multi-point touch detection
Solution Approach 1:
The touch detection function is segmented by assigning separate signal lines to different touch electrodes (common electrodes), allowing independent detection of each touch point. This segmentation enables accurate multi-point touch recognition by distinguishing individual touch locations through dedicated detection channels, eliminating the ghost point problem while maintaining structural simplicity.
2Device complexity
If traditional touch electrode arrangement is used, then detection is sequential, but detection time is prolonged
Solution Approach 1:
Multiple touch electrodes are electrically connected in parallel to a single signal line, merging their detection functions. This allows simultaneous detection of multiple touch points through one unified detection channel, dramatically reducing detection time while maintaining accurate multi-point touch recognition capability.
Solution Approach 2:
The common electrodes serve dual functions: as display electrodes for liquid crystal control and as touch detection electrodes for touch input. This multi-functionality eliminates the need for separate touch electrode layers, reducing structural complexity and enabling simultaneous multi-point detection through the integrated electrode system.
3Measurement precision
If more touch electrodes are added for accurate multi-point detection, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The common electrodes perform both display and touch detection functions simultaneously. By utilizing the existing common electrode structure for dual purposes, the system achieves accurate multi-point touch detection without adding extra touch electrode layers or increasing the overall number of electrodes, thus maintaining device simplicity while improving detection capability.
Solution Approach 2:
Multiple touch electrodes are combined and connected to a single signal line for unified detection. This merging approach allows the system to detect multiple touch points accurately using fewer signal lines, reducing the complexity of the signaling infrastructure while maintaining high detection precision.
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 solution enables accurate multi-point touch recognition and reduces detection time by using common electrodes as touch electrodes, enhancing touch sensitivity and avoiding 'ghost points' in self-capacitance touch detection.
Implementation Method 1
Each of the signal lines is configured to transmit a common voltage signal to the corresponding touch electrode
Implementation Method 2
each of the signal lines is further configured to detect whether there is a change of a self-capacitance of the corresponding touch electrode
Data Source
AI summary
The present disclosure provides an ADS array substrate, a method for manufacturing the same and a display device. The common electrodes of the ADS array substrate serves as touch electrodes, and each touch electrode is electrically connected to a corresponding signal line. In a touch time period of a time period for displaying one frame of image, it is detected whether a self-capacitance of the touch electrode is changed via a corresponding signal line and then a touch position is determined. Each signal line corresponds to a unique touch electrode, then a detection signal obtained via each signal line corresponds to a unique touch electrode, so even though a plurality of touch electrodes are touched, the corresponding touches positions may be determined exactly.