To turn a standard display and a regular float glass into a sophisticated touch system, a sensor must recognize the position of the finger(s).
We use projected capacitive touch sensors (PCAP), which are based on electrically conductive and transparent indium tin oxide (ITO). The technical process involves coating a glass panel with ITO and structuring this layer with a laser in a linear or diamond shape. This creates a grid that can be used to identify the position of one or more fingers, but also gestures. For the evaluation of the touch sensor signals we provide complete solutions (hardware and firmware).
To avoid reflections at the contact surfaces of the individual glasses, the individual parts of the touch system are usually optically bonded.