Touch Detection Device With Periodic Sensor Driving
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Solution Overview
Problem
Touch-detection devices face a trade-off between detection precision and time required for sensing, as increasing the number of driving electrodes enhances precision but prolongs the time needed for completing one-time sensing.
Innovation Solution
The implementation of a touch-detection device with a driver that simultaneously supplies a driving signal to first sensors in one period and second sensors in a subsequent period, and successively supplies the signal to individual first sensors when an object is detected, allowing for efficient detection while maintaining precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of driving electrodes is increased to enhance detection precision, then detection resolution is improved, but the time required for completing one-time sensing increases
Solution Approach 1:
The detection surface is divided into multiple regions, each region being sensed simultaneously by dedicated driving electrodes. This segmentation allows parallel sensing operations across different regions, maintaining high detection precision through sufficient electrode density while reducing total sensing time through concurrent operations.
Solution Approach 2:
The sensing operation is organized into periodic cycles where driving signals are supplied to different groups of driving electrodes in sequential time periods. This periodic action enables systematic coverage of the entire detection surface while allowing optimization of signal frequency and duty cycle to balance precision and speed.
2Measurement precision
If the number of driving electrodes is increased to improve detection precision, then detection resolution is enhanced, but device complexity increases
Solution Approach 1:
Multiple driving electrodes are electrically connected in groups, allowing them to be driven simultaneously with common signals. This merging reduces the number of independent signal lines and control circuits needed, thereby reducing device complexity while maintaining the physical presence of multiple electrodes for high detection precision.
Solution Approach 2:
The driving electrodes serve dual functions: they act as both detection elements for sensing touch input and as display elements for showing information. This multi-functionality eliminates the need for separate electrode sets for detection and display, reducing overall device complexity 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 approach reduces the time needed for detection while maintaining detection precision, enabling faster sensing cycles and improved sensitivity without compromising accuracy.
Implementation Method 1
a detection electrode which forms a capacitance between the driving electrode and itself, and detects an object which is in contact with, or in close proximity to, a detection surface
Data Source
AI summary
In one embodiment, a touch-detection device includes first and second sensors, a driver and a detection circuit. The driver supplies a driving signal to the first and second sensors. The detection circuit detects an object which is in contact with a detection area, based on a detection signal which is read from the first and second sensors. The driver simultaneously supplies the signal to the first sensors in a first period, simultaneously supplies the signal to the second sensors in a second period following the first period, when the object was not detected in the first period, and successively supplies the signal to the respective first sensors in the second period, when the object was detected in the first period.