Capacitive Touch Panel with Vertical and Horizontal Sensing Capacitors
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Solution Overview
Problem
Current capacitive touch technologies face challenges with noise immunity and precise multitouch capabilities, as self-capacitive types are prone to ghost points and have low noise immunity, while mutual-capacitive types consume high power and are complex.
Innovation Solution
A touch panel design featuring an array of capacitive sensor units with vertical and horizontal sensing capacitors connected to emitting and receiving signal lines, utilizing a touch sensor chip and an inversion reconstruction algorithm to monitor capacitance changes, ensuring equal capacitance values and effective noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If self-capacitive touch technology is used, then cost is reduced and operation is simplified, but anti-noise ability deteriorates and ghost points increase
Solution Approach 1:
The patent combines both self-capacitive and mutual-capacitive sensing capabilities into a single touch panel system. The touch sensor includes both self-capacitive sensing electrodes and mutual-capacitive sensing electrodes, allowing the system to leverage the simplicity and low cost of self-capacitive technology while incorporating the superior anti-noise ability of mutual-capacitive technology for improved reliability
Solution Approach 2:
The touch panel is designed with multi-functional sensing capabilities, supporting both self-capacitive and mutual-capacitive touch detection modes. This universal design allows the system to adapt to different operating conditions and noise environments, providing robust anti-noise performance while maintaining ease of manufacture through shared electrode structures
2Reliability
If mutual-capacitive touch technology is used, then anti-noise ability is improved and multitouch precision is enhanced, but power consumption increases and working timing becomes complicated
Solution Approach 1:
The touch panel dynamically switches between self-capacitive and mutual-capacitive sensing modes based on operational requirements. The control circuit can activate only the necessary sensing type for each touch event, reducing overall power consumption while maintaining high anti-noise ability and multitouch precision when mutual-capacitive mode is needed
Solution Approach 2:
The system changes operational parameters by adjusting which sensing mode is active. During low-noise conditions or single-touch events, self-capacitive mode is used to conserve power. During noisy conditions or multitouch events, mutual-capacitive mode is activated to maintain precision, thereby optimizing power consumption while preserving reliability
3Device complexity
If only self-capacitive sensing is implemented, then device complexity is reduced, but measurement precision for multitouch deteriorates
Solution Approach 1:
The patent merges self-capacitive and mutual-capacitive sensing structures within the same touch panel. The combination of self-capacitive electrodes and mutual-capacitive electrodes enables precise multitouch detection by leveraging the complementary strengths of both sensing types, while the integrated design keeps overall device complexity manageable
4Measurement precision
If only mutual-capacitive sensing is implemented, then multitouch precision is improved, but device complexity increases
Solution Approach 1:
The touch panel achieves universal sensing capability through a unified electrode structure that supports both self-capacitive and mutual-capacitive modes. This multi-functional design maintains high multitouch detection accuracy while reducing device complexity by eliminating the need for separate sensing structures for different touch modes
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 provides strong anti-noise ability and precise multitouch capabilities, enhancing the performance of capacitive touch panels by effectively calculating capacitance variations and determining touch positions with high accuracy.
Implementation Method 1
each of the capacitive sensor units comprising a vertical sensing capacitor and a horizontal sensing capacitor disposed adjacent to each other
Data Source
AI summary
A touch panel includes a substrate, a plurality of capacitive sensor units, an emitting signal line, N first receiving signal lines, and M second receiving signal lines. Each of the capacitive sensor units includes a vertical sensing capacitor and a horizontal sensing capacitor disposed adjacent to each other. The emitting signal line is connected to one terminal of each of the vertical sensing capacitors and one terminal of each of the horizontal sensing capacitors. The N first receiving signal lines, are respectively connected to another terminals of the vertical sensing capacitors of the capacitive sensor units in the N columns. The M second receiving signal lines are respectively connected to another terminals of the horizontal sensing capacitors of the capacitive sensor units in the M rows, the horizontal sensing capacitors in a same row corresponding to one second receiving signal line.