Cypress Semiconductor Corporation

Robert Michael Birch

Jonathan R Peterson

Andriy Maharyta

Louis W Bokma

Andrew Best

A method and apparatus varying, by interval, a frequency of a drive signal applied to one electrode of each of a plurality of electrode pairs, select a frequency corresponding to the frequency of the drive signal, monitor changes in capacitance of each of the electrode pairs through receive signals at the selected frequency, from the other electrode of each of the plurality of electrode pairs; and determine a position of at least two objects, which are simultaneously on a touch device, according to the monitored capacitance changes.

Touch sensing

An apparatus having a processing device for calibrating a touch-sensor device with calibration capacitors is described. Methods of calibrating the touch-sensor device using the same are also described. Processing device and multiple calibration capacitors are disposed on an integrated circuit (IC) die substrate. The processing device includes a measurement circuit to be coupled to a touch-sensor device and a switching circuit to selectively couple the calibration capacitors to the measurement circuit. The processing device is configured to calibrate the touch-sensor device by applying one or more capacitance touch values from one or more of the calibration capacitors using the switching circuit. The one or more capacitance touch values simulate a touch on the touch-sensor device.

Calibration of a touch-sensor device

An apparatus for and method of resolving multiple centroids from data received from a multi-touch sensor device are described.

Multiple touch resolve

In one embodiment, an apparatus comprises a plurality of capacitors, each having a first electrode and a second electrode. The apparatus includes charging circuitry coupled to the first electrodes and sensing circuitry coupled to the second electrodes, the sensing circuitry configured to detect changes in capacitance across the capacitors responsive to movement of an input object relative to the apparatus. Interpolating circuitry identifies which one of the capacitors is nearest to the input object according to the detected capacitance changes.

A single-layer touch-sensor device having a calibration mechanism coupled therewith is described. Included is a charge measurement circuit coupled, by a pair of electrical traces, with a slider of the single-layer touch-sensor device. A pair of calibration capacitors is included, each calibration capacitor coupled, between the slider and the charge measurement circuit, with one of the pair of electrical traces. A pair of connection switches is also included, each connection switch coupled with one of the pair of calibration capacitors.

Calibration of single-layer touch-sensor device

An embodiment of the present invention is directed to a method for rejecting sensor information when a switch is being pressed in a system having sensors over switches. A switch in the process of being pressed may be determined based on an increase in pressure which may be determined by measuring the increase in capacitance at a plurality of capacitive sensors. The rejection of sensor information when the switch is being pressed allows the user interface to more accurately thus facilitates smooth and jitterless interface operation.

Growing community of inventors

Seattle, WA, United States of America

Robert Michael Birch