Kunlun Tongtai touch screen - the data processing process of capacitive touch screen

Create Date: 2024-8-30 12:03:23|Source: Kunlun Tongs/MCGS

After receiving the touch signal, the capacitive touch screen converts the touch data into electrical pulses and transmits it to the touch screen control IC for processing. The signal is amplified by a low-noise amplifier (LNA), then converted and demodulated by analog-to-digital ratio, and finally sent to a DSP for data processing.

Capacitive touch screens generally have M+N (M rows, N rows) physical capacitive touch sensors. These M+N interleaved sensors form the M*N capacitive sensing points, which change when the user's finger approaches the touchscreen. The spacing of the sensors (i.e., the distance between adjacent rows or columns) is usually around a few millimeters, and this separation distance determines the physical resolution of the touchscreen M*N.

The coordinate system between the capacitive touch screen module and the LCD module is completely different. The pixel coordinates of the LCD module are generally determined by its resolution, for example, a WVGA screen, its resolution is 800*480, that is to say, there are 800 lines, each row of 480 RGB pixels. Thus, a specific position can be determined by pixels (x,y) in the X and Y directions. Capacitive touchscreen modules, on the other hand, determine the coordinate system based on their original physical dimensions in the X and Y directions. There must be a reasonable mapping method between the two coordinate systems to ensure the correctness of the input and output operations.

Therefore, the DSP processor of the touch screen control IC also has to convert the pixel mapping between the capacitive touch screen module and the LCD module on the obtained data, so as to ensure that the touch point sensed by the user on the touch screen is the point pointed by the user.

In addition, in order to maintain the stability of the touch coordinates, the touch screen control IC needs to further process the jitter of the touch point, including the jitter of the finger and the noise of the capacitive data, and change the filtering coefficient of the low-pass filter according to the change of coordinates to achieve smooth processing of the coordinates.

Finally, software must be used to analyze the data and determine what function each touch is intended to use before it can be transmitted to the console. This process involves determining the size, shape, and location of the area to be touched on the screen. If necessary, the processor groups similar touches. If the user moves their finger, the processor calculates the difference between the start and end of the user's touch.

Kunlun Tongtai touch screen - the data processing process of capacitive touch screen

More on that

	Failure and maintenance method of Kunlun Tongtai touch screen 1. Failure regarding touch deviation If it is the position touched by the finger that does not coincide with the mouse arrow. Then you should install the driver and correct the position without touching the bullseye vertically. and re-correct the position. If some areas are touched accurately, some areas ...
	Introduction to Kunlun Tongtai touch screen programming software Kunlun Tongtai touch screen programming software is a very professional configuration software. This program is very robust and suitable for the engineer profession, which can perform a variety of functions such as rapid data collection, detection, front-end data processing and control, and it can also be used with all kinds of mainstream collection boards.
	Kunlun Tongtai touch screen - the advantages and disadvantages of resistive screen merit The advantage of resistive touch screen is that its screen and control system are relatively cheap, and the response sensitivity is very good, and whether it is a four-wire resistance touch screen or a five-wire resistance touch screen, they are a kind of working environment that is completely isolated from the outside world, not afraid of dust and water vapor, and can adapt to various ...
	How to write the variable address of Kunlun Tongtai touch screen The writing of the variable address of Kunlun Tongtai touch screen depends on the communication protocol and communication method used. In general, the variable address of the touch screen is communicated through the Modbus protocol, and the address can be written in the following ways: 1. For Modbus RTU communication mode, change ...
	Kunlun Tongtai touch screen - comparison of the advantages and disadvantages of various industrial touch screens 1. Surface acoustic wave screen The three corners of the acoustic screen are pasted with transducers that transmit and receive sound waves in the X and Y directions respectively (transducers: made of special ceramic materials, divided into transmitting transducers and receiving transducers. It is to convert the electrical signal sent by the controller through the touch screen cable into sound.
	Three common maintenance methods to solve Kunlun Tongtai touch screen failure 1. The touch of some areas is accurate, and the touch of some areas is biased The main reason for this phenomenon is that a large amount of dust or scale dirt has accumulated on the sound wave reflection stripes on the periphery of the surface sound wave Kunlun Tongtai touch screen, which hinders the transmission of sound wave signals. At this point, you can clean the touch ...
	Kunlun Tongtai touch screen - compared with the traditional touch screen, what are the advantages of capacitive touch screen 1. Novelty of operation The capacitive touch screen supports multi-touch, making operation more intuitive and fun. 2. It is not easy to be touched by mistake Because the capacitive touch screen needs to sense the current of the human body, as long as the human body can operate it, there will be no ...
	Kunlun Tongtai touch screen - what is the difference between capacitive screen and resistive screen? 1. The meaning is different Resistive Screen: A resistive touch screen is a touch screen product controlled by pressure sensing. Capacitive screen: Capacitive screen, also known as capacitive touch screen, is a four-layer composite glass screen that uses capacitive touch technology to work. 2. The working principle is different Electricity...
	Kunlun Tongtai touch screen - the advantages of wireless resistance touch screen 1. Compared with the four-line touch screen, the five-line touch screen has a longer service life and can withstand more than 30 million clicks. The lifespan of a four-wire resistive touch screen is 3 to 4 years, while the average of a five-wire resistive screen can reach 6 years. 2. Once the industrial display of the four-wire touch screen is touched...
	Kunlun Tongtai touch screen - the difference between infrared touch screen and capacitive touch screen The difference between infrared touch screen and capacitive touch screen is that the infrared touch screen has grooves and is afraid of strong light. This machine is thick and heavy, but it is cheap. The capacitive screen all-in-one machine is more beautiful, lighter and thinner, it is pure flat and easy to implement. 1. Infrared touch screen all-in-one machine Infrared technology ...
	How to operate the Kunlun Tongtai touch screen network setting When using Kunlun Tongtai touch screen, sometimes for communication requirements, you need to set up a network communication address, so how to set up the network of Kunlun Tongtai touch screen? Let's take a look at it. Power on the Kunlun Tongtai touch screen, tap anywhere on the screen to enter the main interface after the TPC is powered on, ...
	Introduction to the main functions and components of Kunlun Tongtai embedded configuration software The main features of the MCGS embedded configuration software 1. Simple and flexible visual operation interface: using full Chinese and visual development interface, in line with the usage habits and requirements of Chinese. 2. Strong real-time performance and good parallel processing performance: it is a real 32-bit system...
	Types of Kunlun Tongtai touch screens Kunlun touch screen is a positioning device, the user can directly enter coordinate information by pointing to the computer, just like a mouse and keyboard, it is also an input device. Kunlun touch screen has many advantages such as durability, fast response, space saving, and convenient communication. With this technique, ...
	Kunlun Tongtai touch screen - touch all-in-one screen fault analysis and treatment method Analysis and treatment method of touch all-in-one screen fault Fault 1: Touch deviation phenomenon: The position touched by the finger does not coincide with the mouse arrow. Analysis: After installing the driver, there was no vertical touch to the bullseye center position when correcting the position. Place...
	How does the touch screen communicate with the PLC? 1. Connect the touch screen with the PLC We know the communication between two pieces of hardware, whether wireless or wired. The first step is to establish a connection. The most common connection between PLC and touch screen is serial data cable connection. The data cable can be used in a treasure ...
	How to set the fault alarm between Kunlun Tongtai touch screen and Siemens PLC 1. Write a program in the PLC, and when a fault occurs, an alarm signal will be output. The corresponding program can be written with a series of PLCs such as S7-200 or S7-1200. 2. Configure the communication protocol between the PLC and the touch screen. Protocols such as MODBUS or OPC can be used to communicate, specifically ...
	How to detect Kunlun Tongtai touch screen and 200smart communication 1. First of all, go to the official website of MCGS to download the latest version of other embedded versions, and you can find the PPI of S7-200 in the "Equipment Toolbox", which is compatible with the driver of Siemens SMARTPLC. 2. Secondly, all non-board equipment in Kunlun MCGS is the first to pass ...
	The main function of Kunlun Tongtai embedded configuration software The main features of the MCGS embedded configuration software 1. Simple and flexible visual operation interface: using full Chinese and visual development interface, in line with the usage habits and requirements of Chinese. 2. Strong real-time performance and good parallel processing performance: it is a real 32-bit system...
	Kunlun Tongtai touch screen - technical parameters of five-wire resistive touch screen Screen structure: ITO Film and ITO Glass are laminated, and the middle is isolated by a DOT point Outlet cable: FRC copper cable (flat conduction wire) length: 200mm Connection location with touch screen: Withstand tensile force: 2.0 kg horizontal with the screen, 1.0 kg vertical with the screen...
	The solution to the touch failure of the industrial touch screen 1. Check the wiring port: first check whether the wiring interface is loose, and then check whether the serial port conflicts with the interrupt number. If a conflict occurs, adjust resources to avoid it. Check the surface of the industrial touch screen again for cracks, and replace it in time if so. At the same time, inspect the surface of the industrial touch screen ...