Touch Electrode Grouping for Accurate Display Touch Sensing
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Solution Overview
Problem
Existing touch detection modules in display devices face challenges in accurately sensing touches due to deviations in touch sensing signals and noise effects across different sensing areas, which affect the precision and efficiency of touch detection.
Innovation Solution
The touch detection module employs a touch driver circuit that sorts driving electrodes into groups based on distance from the driver circuit, varying the number of electrodes simultaneously driven and modulating signal characteristics like supply period, frequency band, and voltage level to reduce signal deviations and noise, thereby enhancing touch detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the same number of touch driving electrodes are simultaneously driven across all sensing areas, then the touch driver circuit operation is simplified, but signal deviations and noise effects occur due to different distances from the touch driver circuit
Solution Approach 1:
The patent applies local quality by configuring different numbers of simultaneously driven touch driving electrodes for different sensing areas based on their distances from the touch driver circuit. Specifically, a first number of electrodes are simultaneously driven in a first sensing area closer to the touch driver circuit, while a second number of electrodes are simultaneously driven in a second sensing area farther away, with the first number being greater than the second number. This localized differentiation compensates for signal attenuation and reduces noise effects in distant areas, thereby improving overall touch detection accuracy without requiring complete system redesign.
Solution Approach 2:
The patent segments the touch sensing area into multiple regions (first sensing area and second sensing area) based on distance from the touch driver circuit. Each segment is then configured with appropriate numbers of simultaneously driven electrodes tailored to its specific characteristics. This segmentation allows the system to optimize performance for each region independently, addressing signal deviations caused by varying distances while maintaining manageable circuit operation through structured organization.
2Productivity
If more touch driving electrodes are simultaneously driven to improve detection speed, then productivity increases, but signal deviations and noise effects worsen across different sensing areas
Solution Approach 1:
The patent applies local quality by configuring different numbers of simultaneously driven touch driving electrodes for different sensing areas based on their distances from the touch driver circuit. Specifically, a first number of electrodes are simultaneously driven in a first sensing area closer to the touch driver circuit, while a second number of electrodes are simultaneously driven in a second sensing area farther away, with the first number being greater than the second number. This localized differentiation compensates for signal attenuation and reduces noise effects in distant areas, thereby improving overall touch detection accuracy without requiring complete system redesign.
3Loss of time
If the number of simultaneously driven electrodes is increased to reduce detection time, then detection efficiency improves, but noise effects and signal deviations increase
Solution Approach 1:
The patent applies local quality by configuring different numbers of simultaneously driven touch driving electrodes for different sensing areas based on their distances from the touch driver circuit. Specifically, a first number of electrodes are simultaneously driven in a first sensing area closer to the touch driver circuit, while a second number of electrodes are simultaneously driven in a second sensing area farther away, with the first number being greater than the second number. This localized differentiation compensates for signal attenuation and reduces noise effects in distant areas, thereby improving overall touch detection accuracy without requiring complete system redesign.
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 approach reduces signal deviations and noise, improving the accuracy and efficiency of touch detection by optimizing the number and characteristics of touch driving signals across different sensing areas.
Implementation Method 1
modulating signal characteristics like supply period, frequency band, and voltage level to reduce signal deviations and noise
Implementation Method 2
a touch driver circuit that detects a change in the capacitance among the touch electrodes
Data Source
AI summary
The present disclosure relates to a touch detection module and a display device including the same. According to an embodiment, a touch detection module includes driving electrodes arranged in parallel, sensing electrodes arranged to cross the driving electrodes, and a touch driving circuit configured to supply touch driving signals to the driving electrodes and detect touch sensing signals through the sensing electrodes to detect touch position coordinates, wherein the touch driver circuit sorts the driving electrodes into a plurality of touch electrode groups based on distances between the touch driver circuit and the driving electrodes, and sequentially supplies the touch driving signals to the driving electrodes of the touch electrode groups.