) Is a form of data import and output devices are mixed together in order to reduce the size of the area used by the program to display graphics on the screen and the touch of a finger, users can use to select items on the screen, all that is in the nature of a picture or text to popular touch-screen commands implemented in the style of work that help people who have difficulty using the device handle must be imported, such as keyboard, mouse, etc.Touch screen, we know which position on the screen, press.The touch screen will be able to know where we feel it will have to rely on the basic system which has 3 different categories: Resistor (resistive) The system consists of Chong krachok resistors are coated with conductive and resistor, both by this class are not contiguous. With a barrier layer and the adjustable resistor on top. While the screen is working, there will be electricity flowing through both layers. When users touch the screen. Make two layers layer where we touch each other. Changes of electric current flowing through and was saved, and calculate the position immediately. Straight touch, knowing that any section then there will be a special driver that acts as a signal to the touch, or translate the code sent to the operating system. Capacitor (capacitive) The system will be the capacitors that store electric charge class which is placed on the screen of the Chong krachok. When users touch the screen, some of the ions are sent to the user, the existing electric charge in capacitors decreased. This will decrease the position of the indicator to the touch, which is a circuit that monitors located at the corner of the screen on all four corners. Then the computer will calculate the difference in electric charge from each corner until the touch position and then sent to the driver. Surface acoustic wave (surface acoustic wave) screen.Wave audio system. On the screen of the surface acoustic wave screen system will have a receiver and transmitter, as always, the vertical and horizontal of the glass of the screen and a reflective Act. Send electronic signals coming from the transmitter to the other. The receiver will tell if disturbed by waves of users and will be able to experience batamnaeng RA. The use of the system wave makes the screen can display more clearly the two systems above.In other systems, things will be different, it is checking a user's touch. If a system with two resistors and specify the location of the impact from the. The user can use a finger or press anything. In the system, it must be a capacitor, a device that is conductive. Typically, it takes the user's finger to cause the flow of charge is used to specify the position. The section in the surface acoustic wave screen system will work in a system similar to the resistance to the touch, the user can use anything touching it. With the exception of a pen or small and solid materials.In regard to price. The system will be resistance, but the image that appears on the screen is not clear, because the resistance is only 75% only krasaeng (the system capacitor to be 90% light distribution) and the material will not cause spikes. The screen of the surface acoustic wave screen system will have a maximum price.
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