Touch screen is a screen on the surface of Liquid Crystal Display (LCD). It can receive contact from outside, like man’s finger. When you touch a picture button of LCD, the touch screen would generate some kind of contact signal according to pre-programmed programs. It is perfectly replacing the mechanical button, not only from function effect but also from the sound effect and visual effect. As one of the newest computer output devices, touch panel is the simplest, easiest, and the most natural way for human-machine interaction so far. It is a revolutionary product that totally changes the appearance of multi-media devices that highly attract attention. It is widely used in public information inquiry machines, office devices, industrial control devices, military commanding devices, electronic game machines, food ordering devices in cafeteria, multi-media teaching devices in school and so on. The technical requirements of touch panel are transparent material and absolute orientation. Firstly, touch screen is on the surface of LCD, so it must be transparent and people could see the video from LCD. That is the reason why chalkboard and elevator switch button do not use LCD. Secondly, absolute orientation, it means wherever your finger touches is the exact position and you do not need a second action. It is unlike the computer mouse that has a relative system and it needs an arrow to tell you the position. Touch panel does not have an arrow because an arrow would confuse the users.
(Last Updated On: June 18, 2020)