A simple projected capacitive touch panel is developed. This touch panel is capable of detecting multi-point touch events. The
device consists of a single piece of patterned transparent ITO glass and a sensing circuit. The applied driving signal is projected onto the sensing node in the form of an electric field. A charge sensing circuit is used to monitor the mutual capacitance between the driving and sensing nodes. This approach provides a simple and low cost alternative to current capacitive multi-touch panel design.
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