Aldan Point Touch Screen LCD

1) optical imaging techniques is to record the touch point, or recognise an off-screen gesture. Using this unique technology, the touch actually registers up to 1mm (0. 04) before the physical touch on the touch surface. This technology effectively scales to touch-enable very large displays. Overlays are not used, therefore excellent image clarity is provided. In addition, scratches on the touch surface will not affect the touch screen operation. 2) surface acoustic wave technology is one of the most advanced touchscreen types. It is based on sending acoustic waves across a clear glass panel with a series of transducers and reflectors. When a finger touches the screen, the waves are absorbed, causing a touch event to be detected at that point. Because the panel is all glass there are no layers that can be worn, giving this technology the highest durability factor and also the highest clarity. 3) 5-wire resistive touch technology consists of a glass or acrylic panel that is coated with electrically conductive and resistive layers. The thin layers are separated by invisible separator dots. When operating, an electrical current moves through the screen. When pressure is applied to the screen the layers are pressed together, causing a change in the electrical current and a touch event to be registered. 5-wire resistive type touchscreens are generally more durable than the similar 4-wire resistive type. Although clarity is less than with other touch screen types, resistive screens are very durable and can be used in a variety of environments. This type of screen is recommended for demanding point-of-sale systems, restaurant systems, industrial controls, and other workplace applications.