Capacitive Touch System Time Delay for Edge Data Integrity
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Solution Overview
Problem
Existing capacitive touch systems face issues when an active pen is near the edge of a touch panel, as they switch from a position detecting mode to a data receiving mode prematurely, resulting in incomplete data transmission and incorrect determination processes.
Innovation Solution
A capacitive touch system with a touch control chip that drives electrodes via driving wires and reads sensing signals from sensing electrodes, allowing for a time delay between position detection and data reception modes, enabling complete data transmission by driving the last driving wire multiple times or reversing the driving direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the touch panel switches from position detecting mode to data receiving mode immediately, then the response speed is improved, but data completeness deteriorates when touch is near the edge
Solution Approach 1:
The patent applies preliminary action by introducing a time delay period before switching from position detecting mode to data receiving mode. This delay ensures that the touch panel completes the position detection cycle and receives complete data from the active pen before mode switching occurs, preventing data loss especially when the touch is near the edge of the panel.
Solution Approach 2:
The patent implements dynamics by making the mode switching timing adaptive rather than fixed. The system dynamically adjusts the timing between position detection and data reception based on the touch location and duration, allowing flexible transition that maintains both response speed and data completeness under different operating conditions.
2Productivity
If the touch panel receives data immediately upon touch, then data transmission efficiency is improved, but position detection accuracy deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the touch handling process into distinct sequential phases: first position detecting mode to determine touch location, then a time delay period, and finally data receiving mode. This segmentation ensures that position detection is completed accurately before data transmission begins, maintaining both precision and efficiency.
Solution Approach 2:
The patent uses preliminary action by performing position detection before data reception. The system first identifies the touch position and completes the detection cycle, then initiates data receiving mode. This preliminary position detection ensures accurate measurement while the time delay allows the system to prepare for efficient data transmission without interference.
3Device complexity
If the touch panel uses a single driving mode, then the device complexity is reduced, but data reception completeness deteriorates at edge locations
Solution Approach 1:
The patent implements dynamics by introducing a time delay mechanism that adapts the driving sequence based on touch location. When touch is detected near the edge, the system dynamically extends the position detection phase and delays data reception to ensure completeness. This dynamic adjustment maintains data reception completeness without requiring complex additional hardware, preserving system simplicity.
Solution Approach 2:
The patent applies parameter changes by modifying the timing parameters of the driving sequence rather than changing the fundamental driving mode. The system adjusts the time delay period and mode switching timing based on touch position and duration, allowing flexible adaptation to different scenarios while maintaining the same basic driving architecture and avoiding increased device complexity.
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
Ensures accurate position detection and complete data reception by separating the modes with a time delay, preventing data loss and improving the reliability of capacitive touch systems.
Implementation Method 1
the touch control chip drives the driving electrodes via the driving wires
Implementation Method 2
the touch control chip reads a sensing signal from the sensing electrodes via the sensing wires
Data Source
AI summary
A capacitive touch system and a sensing method thereof are disclosed. The capacitive touch system includes a touch panel including a plurality of driving electrodes and a plurality of sensing electrodes; a touch control chip; and an external device configured to transmit data to the touch control chip. In a position detection mode, the touch control chip drives the driving electrodes, reads a sensing signal from the sensing electrodes, and determines a position of a touch according to the sensing signal. In a data receiving mode, the touch control chip receives the data transmitted by the external device after a time delay period. In the capacitive touch system and the sensing method thereof, the position detection mode and the data receiving mode can be sequentially performed by delaying the time period.