1. Capacitive sensing touch
Capacitive sensing devices use the current sensing of the human body to work. The capacitive touch screen is a four-layer composite glass screen. The inner surface and interlayer of the glass screen are each coated with a layer of ITO, and the outermost layer is a thin layer of silica glass protective layer. , The sandwich ITO coating is used as the working surface, four electrodes are drawn on the four corners, and the inner layer of ITO is the shielding layer to ensure a good working environment. When the finger touches the metal layer, due to the human body electric field, the user and the touch screen surface are formed A coupling capacitor. For high-frequency current, the capacitor is a direct conductor, so the finger draws a small current from the contact point. This current flows from the electrodes on the four corners of the touch screen and flows through the four electrodes. It is proportional to the distance from the finger to the four corners. The controller obtains the position of the touch point by accurately calculating the ratio of these four currents. The surface of the capacitive touch all-in-one machine is flat.
2. Infrared touch
The infrared touch screen used in the infrared touch all-in-one machine uses the dense infrared matrix in the X and Y directions to detect and locate the user's touch. It corresponds to the infrared receiving tube one by one to form a horizontal and vertical cross infrared matrix. When the user touches the screen, the finger will block the two horizontal and vertical infrared electronic whiteboard lines passing through the position, so it can judge the position of the touch point on the screen. The touch screen is a highly integrated electronic circuit integration product. The infrared touch screen contains a complete integrated control circuit, and a set of high-precision, anti-interference infrared emitting tubes and a set of infrared receiving tubes, which are cross-mounted on the highly integrated circuit board. In two opposite directions, an invisible infrared grating is formed. The intelligent control system embedded in the control circuit continuously pulses the diode to form an infrared polarized beam grid, thereby realizing the function of infrared touch. Infrared touch screens are generally suitable for light Large-size touch all-in-one machine.
The rapid development of touch all-in-one manufacturers in recent years has made people more confident in the prospects of this market, and further analysis of the factors of its rapid development mainly include the progress of various technologies and the overall market environment. At the same time, all walks of life are concerned about this kind of The demand for technical equipment is constantly expanding and increasing. Of course, the cooperation of various technical resources and professional channels is also a vital driving force.
