LOW-LATENCY TOUCH SENSITIVE DEVICE

摘要

Disclosed are a sensor and method that provide detection of touch events from human fingers on a two-dimensional manifold with the capability for multiple simultaneous touch events to be detected and distinguished from each other. In accordance with an embodiment, the touch events are detected, processed and supplied to downstream computational processes with very low latency, i.e. on the order of one millisecond or less. Disclosed is a projected capacitive method that has been enhanced for high update rate and low latency measurements of touch events. The technique can use parallel hardware and higher frequency waveforms to gain the above advantages. Also disclosed are methods to make the measurements sensitive and robust, allow the technique to be used on transparent display surfaces and permit economical manufacturing of products which employ the technique.

主权项

1. A low-latency touch sensitive device comprising:
first and second plurality of conductors being arranged such that:
each of the paths of the conductors of the first plurality of conductors cross each of the paths of the conductors of the second plurality of conductors, and whereinwhen the touch sensitive device is not being touched, a negligible amount of signal is coupled between them, andwhen the touch sensitive device is being touched, a non-negligible amount of signal is coupled between them; signal generator adapted to generate a plurality of unique orthogonal signals, each unique orthogonal signal being orthogonal to each of the other unique orthogonal signals; transmitter associated with the first plurality of conductors, the transmitter being adapted to transmit each of the plurality of unique orthogonal signals on each of the first plurality of conductors simultaneously; receiver associated with the second plurality of conductors, the receiver being adapted to receive signals present on each of the second plurality of conductors; and signal processor being adapted to decode the signals present on each of the second plurality of conductors, and for each of the signals present on each of the second plurality of conductors to determine which of the unique orthogonal signals form a non-negligible part thereof.