- Anne Beetem Acker
Table-height electronic display and controller (interface) with a touchscreen top that can detect two or more simultaneous points of contact on its surface. Multi-touch tables typically include an integral computer to process the screen’s input and output as well as any other associated outputs such as audio. The screen surface (a sheet of glass or polymer) is lit by an array of infrared LEDs around the edge of the screen inside the table, and a short-throw projector displays an image (e.g. a keyboard) on the screen from below. Some form of optical touch technology such as surface capacitance, SAW (surface acoustic wave), infrared grid technology, or FTIR (frustrated total internal reflection) is used to detect and locate touches on the image. An internal camera sends data to the computer, which then deduces where the fingers have pressed and uses that information to control an application (app). Multi-touch tables use either custom software or a touchscreen package such as Touchlib....