Industrial all-in-one resistive screen capacitive touch screen infrared from working principle to the advantages and disadvantages compared

Resistance screen capacitance screen industrial machine infrared touch screen panel from working principle to the advantages and disadvantages compared to industrial machine principle for operational convenience, people can use the touch screen to replace the mouse or keyboard. Work, the first touch installation with fingers or other objects in the front of the touch screen, displays and system according to the fingers touch the icon or menu to locate the position selection information input. Touch screen consists of touch detection unit and touch screen controller; Touch detection unit installed in front of the display screen, used to detect the user touch position, after accept send a touch screen controller; The main function of controller and touch screen from the touch point detection device to receive touch information, and convert it to touch point coordinate, then to the CPU, it also can accept and execute command from the CPU. 1, surface acoustic wave screens acoustic screen paste with X respectively, and the three Angle Y direction of the transmit and receive sound wave transducer ( Transducer: made of special ceramic materials, divided into transmitting transducer and receiving transducer. Is the controller through the touch screen cable from the electrical signal into sound waves can and by the reflection stripe into surface acoustic waves into electrical signals. ） , four side engraved with the reflecting surface of ultrasonic reflection stripes. When a finger or a soft touch screen object, part of the acoustic energy is absorbed, so changed the received signal, and after the processing of the controller to get a touch of X, Y coordinates. 2, 4 line resistance screen 4-wire resistive touch between surface protective coating and base covered with two layers of ITO transparent conductive layer ( ITO: indium oxide, weak conductive body, feature is down to 1800 (when the thickness Mr = 10 - 10 meters) The following will suddenly become transparent, light transmittance drop instead, if you go on thin to 300 when the thickness of light transmittance and rising. Is that all the resistance and the main material of capacitive touch screen. ） , two layer corresponding to the X, Y, among them with a small transparent insulation insulation particles, when touching the pressure made through two conductive layer, due to the change of electrical resistance have a touch of X, Y coordinates. 3, five line resistance screen five line resistance screen above base covered with the X, Y direction of the two voltage field and in the same layer of ITO transparent conductive layer, the outermost layer of nickel gold conductive layer ( Nickel gold conductive layer: just for pure conductor, when touch with time-sharing detection contact point X axis and Y axis voltage method measured the position of the touch point. Inner ITO need, four leads the outer one, a total of 5 root lead. 4, capacitive touch capacitance screen surface coated with ITO transparent conductive layer, voltage is connected to the four corners, small dc distribute in the screen surface, form a uniform electric field, with the hand touch screen, the human body as a highly coupling capacitance, from another screen corners together to form the coupling capacitance current, current through the calculation of the controller to the touch location relative distance to get the coordinates of the touch. Infrared screens infrared touch screen is the b with X, Y direction with infrared matrix to detect and locate zhi, the user's touch. Usually the infrared touch screen in front of the display to install a frame, the circuit boards by outer frame around the screen configuration infrared transmitting tube and infrared receiving tube, one to one correspondence form somehow cross infrared matrix. Users in the touch screen, the finger will block after the location of the relation of two infrared, which can determine the location of the touch point on the screen.