LCD touch panel, also known as touch panel, is an inductive LCD device that can receive touch and other input signals. When touching the graphic buttons on the screen, the tactile feedback system on the screen can drive various connection devices according to the pre-programmed program, which can replace the mechanical button panel and create a vivid audio and video effect through the LCD screen.
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LCD touch screen structure
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 conductor layers, and electrodes.
The resistive conductor layer is composed of a resistive material, such as indium tin oxide (ITO) coated on a substrate, with plastic for the upper substrate and glass for the lower substrate.
The isolation layer is a viscous insulating liquid material, such as polyester film. The electrodes are made of materials with excellent conductivity (such as silver powder ink), whose conductivity is about 1000 times that of ITO.
LCD touch screen principle
For operational convenience, people use a touch screen instead of a mouse or keyboard. When working, we must first touch the touch screen installed in the front of the display with a finger or other object, and then the system is positioned according to the location of the finger touch icon or menu to select the information input.
LCD touch screen consists of touch detection components and touch screen controller; touch detection components installed in front of the monitor screen, used to detect the user’s touch location, accepted and sent to the touch screen controller.
The main role of the LCD touch screen controller is to receive touch information from the touch point detection device, and convert it into contact coordinates, and then sent to the CPU, it can also receive commands from the CPU and to execute.
