Capacitive Touch Panel Data Transmission via Signal Inversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional touch panels require at least 3 touch points and have distance limitations, restricting data transmission capabilities, especially in hand-held devices with multi-touch screens, which limits simultaneous connections to 3 devices.
Innovation Solution
A touch-control communication system utilizing a projective capacitive touch panel with a processing circuit that outputs a touch-control radio frequency detection signal, which is inverted and modulated to transmit data through a single or multiple touch points, allowing data transmission to mobile devices via a capacitive touch interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional touch panel communication method is used, then data transmission is possible, but at least 3 touch points are required and distance limits exist among touch points
Solution Approach 1:
The patent extracts the communication function from the traditional multi-touch-point requirement and implements it through a single touch point. The external device communicates with the touch panel by detecting changes in capacitance at one touch point, eliminating the need for multiple touch points and their associated distance constraints.
Solution Approach 2:
The touch panel's capacitive sensing capability is extended to serve dual purposes: traditional touch input and data communication. By modulating the capacitance at a single touch point, the system enables the touch panel to function as both an input device and a communication interface, allowing connection to multiple devices simultaneously.
2Quantity of substance
If conventional touch panel communication is used, then 3 devices can be connected simultaneously, but only 10 touch points are available on touch panels
Solution Approach 1:
The patent implements dynamic communication by sequentially activating different touch points for different device connections. The system can dynamically switch between communication modes, allowing multiple devices to connect simultaneously by allocating different touch points or time slots to different devices, thereby exceeding the traditional limit of 3 simultaneous connections.
3Loss of information
If touch panel characteristics are utilized for data transmission, then communication capability is enhanced, but signal-to-noise ratio decreases
Solution Approach 1:
The patent employs feedback mechanisms where the external device sends test signals to the touch panel and analyzes the reflected or modulated signals. By continuously monitoring the capacitance changes and adjusting the detection parameters, the system can distinguish genuine data signals from noise, thereby maintaining high measurement precision while enabling robust data transmission.
Solution Approach 2:
The patent introduces an intermediary detection circuit that acts as a mediator between the touch panel capacitance changes and the data transmission process. This intermediary circuit amplifies and filters the weak capacitance signals, converting them into reliable digital data while rejecting noise, thus enabling accurate data transmission through the touch panel's capacitive characteristics.
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
Enables data transmission to mobile devices using a single or multiple touch points, enhancing the data transmission capabilities of touch panels by allowing more flexible and efficient communication with multiple devices simultaneously.
Implementation Method 1
When a finger touches the capacitive touch panel, a part of the electric field is absorbed by the finger, resulting in change in the charge time and the discharge time
Implementation Method 2
The signal receiving antenna is used to receive the touch-control radio frequency detection signal
Implementation Method 3
The signal inverting circuit inverts the received touch-control radio frequency detection signal to output an inversion signal
Implementation Method 4
The signal modulating circuit outputs a modulation signal according to a transmitted data and the inversion signal
Implementation Method 5
The signal amplifying circuit amplifies the modulation signal output by the signal modulating circuit so as to output an amplification signal
Data Source
AI summary
A touch-control communication system and a touch control communication method are provided in the present invention. The system includes a mobile device and a data transmission device. The mobile device has a capacitive touch panel, and the capacitive touch panel emits a touch sensing signal when the capacitive touch panel senses touch. The data transmission device is configured with a transceiver antenna and a signal inverting circuit. According to the transmission data, the data transmission device determines whether or not the signal inverting circuit outputs an inversion signal to the transceiver antenna, so that the capacitive touch panel obtains a logic state of the transmission data by detecting whether or not a touch point exists. Thus, the transmission data can be transmitted to the mobile device.