what is tft lcd touch screen ?

Touch screen is also called LDQUO; Touch screen throughout; And other Touch panel RDQUO; Touch, is a kind of can receive the first input signal of induction type liquid crystal display device, when contact with the graphic buttons on the screen, the screen of the tactile feedback system according to the program of pre-programmed drive all kinds of connecting device, can be used to replace the mechanical button panel, and liquid crystal display screen by creating vivid audio effect. As one of the latest computer input devices, touch screen is the most simple, convenient and natural way of human-computer interaction. It gives multimedia a new look, is a very attractive new multimedia interactive equipment.


It is mainly used in public information inquiry, leadership office, industrial control, military command, video games, song and order, multimedia teaching, real estate presale and so on. How it works For the convenience of operation, people use touch screens instead of mouse or keyboard. 


When working, first touch the touch screen installed on the front of the display with a finger or other objects, and then the system will locate and select information input according to the icon or menu position touched by the finger. The touch screen is composed of a touch detection component and a touch screen controller. The touch detection component is installed in front of the display screen for detecting the user’s touch position and receiving the touch screen controller after delivery; The main function of the touch screen controller is to receive touch information from the touch point detection device, and convert it into contact coordinates, and then send to the CPU, it can receive the COMMAND from the CPU and execute it.

nbsp; The main types of touch screens are distinguished by technical principles and can be divided into five basic categories: vector pressure sensing touch screens, resistive touch screens, capacitive touch screens, infrared touch screens, and surface acoustic touch screens.


Among them, the vector pressure sensor technology touch screen has retired from the stage of history; Infrared touch screen is cheap, but its frame is fragile, easy to produce light interference, distortion in the case of curved surface; The design idea of capacitive touch screen is reasonable, but the problem of image distortion is difficult to be solved fundamentally. The positioning of the resistance technology touch screen is accurate, but its price is quite high, and it is afraid of scraping and easy to damage;

Surface acoustic touch screen solves various defects of previous touch screen, clear and not easy to be damaged, suitable for various occasions, the disadvantage is that if there are water droplets and dust on the surface of the screen, the touch screen will become dull, or even do not work. According to the working principle of touch screen and the medium of information transmission, there are four types of touch screen, they are resistive type, capacitive inductive type, infrared type and surface acoustic type.


Each type of touch screen has its own advantages and disadvantages, and understanding how each type of touch screen technology works and its characteristics is key to understanding which type of touch screen is suitable for which situation.

what is tft lcd touch screen ?


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