Capacitive Touch Screen NFC Multiplexing Electrodes
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Solution Overview
Problem
Existing near field communication methods for capacitive touch screen terminals using electrostatic field detection fail to transmit data reliably between touch screens with large size differences and often initiate data transmission incorrectly, leading to poor user experience.
Innovation Solution
The method employs multiplexed driving and sensing electrodes to transmit data as a frequency sequence, allowing for accurate near field communication between capacitive touch screen terminals with size differences, and includes verification mechanisms to ensure correct data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electrostatic field detection manner is adopted to integrate NFC function in touch chip, then hardware structure is simplified, but data transmission fails between touch screens with large size difference
Solution Approach 1:
The patent changes the detection parameter from static electrostatic field distribution to dynamic frequency sequence modulation. The touch screen electrodes modulate the frequency of signals based on capacitance changes, enabling reliable data transmission between screens of different sizes by transforming spatial electrostatic interactions into temporal frequency variations.
Solution Approach 2:
The patent replaces the traditional NFC electromagnetic coupling mechanism with a capacitive touch screen-based communication system. By utilizing the existing capacitive sensing electrodes in touch screens and modulating signal frequencies rather than relying on dedicated NFC antennas, the system achieves NFC functionality without additional hardware complexity.
2Device complexity
If electrostatic field detection manner is adopted, then integration is improved, but accurate detection of field changes is difficult
Solution Approach 1:
The patent implements feedback mechanisms where the receiving terminal responds with frequency sequences based on detected changes. This bidirectional frequency sequence exchange allows both terminals to confirm successful data transmission and distinguish between intentional communication and spurious field changes, improving detection accuracy.
Solution Approach 2:
The patent uses periodic frequency sequence modulation and detection cycles. By alternating between transmission and reception phases with standardized frequency sequences, the system creates clear temporal patterns that facilitate accurate detection and discrimination from random electrostatic field variations.
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 enhances the reliability of data transmission and user experience by accurately distinguishing between changes in the electrostatic field caused by conductors or terminals, improving integration and reducing hardware complexity.
Implementation Method 1
a voltage is applied to electrodes involved in the data transmission on the first capacitive touch screen, and the corresponding electric field distribution is formed; and, when a second terminal having a second capacitive touch screen contacts the first terminal, the second terminal would detect the electric field distribution
Data Source
AI summary
A capacitive touch screen terminal and a near field communication method and system thereof are provided. In the method and the system, the near field communication is realized through multiplexing driving electrodes and sensing electrodes of a touch sensor in a capacitive touch screen by a transmitting terminal and a receiving terminal, and a frequency sequence is used as a carrier for data transmission. It may be suitable for the near field communication between two capacitive touch screen terminals having a large size difference; meanwhile, after starting the near field communication, the two capacitive touch screens can accurately distinguish whether a change in the electrostatic field is caused by conductors becoming near, or by the terminal communicating with it, wherein the conductors are hand, and so on. Therefore, the reliability while the data transmission is started is improved and the user experience is optimized.