The LCD touch screen, also known as the touch panel, is an inductive liquid crystal display device that can receive input signals such as contacts. When the graphic buttons on the screen are touched, the tactile feedback system on the screen can drive various connections according to pre-programmed programs. The device can be used to replace the mechanical button panel and use the liquid crystal display screen to create dynamic audio-visual effects.
The working part of the LCD touch screen is generally composed of three parts: two transparent resistive conductor layers, an isolation layer between the two conductors, and electrodes.
The resistive conductor layer is made of resistive materials, such as indium tin oxide (ITO) coated on the substrate, the upper substrate is made of plastic, and the lower substrate is made of glass.
The isolation layer is a viscous insulating liquid material, such as polyester film. The electrode is made of materials with excellent conductivity (such as silver powder ink), and its conductivity is about 1000 times that of ITO.
In order to facilitate the operation, people use a touch screen instead of a mouse or keyboard. When working, we must first touch the touch screen installed on the front of the display with a finger or other object, and then the system locates and selects information input according to the icon or menu position touched by the finger.
The LCD 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 to detect the user's touch position and send it to the touch screen controller after acceptance.
The main function of the LCD touch screen controller is to receive touch information from the touch point detection device, convert it into contact coordinates, and then send it to the CPU. It can also receive commands sent by the CPU and execute them.
