Inventors:
Christopher J. Silk - Cambridge, GB
David T. E. Ely - Cambridge, GB
Andrew Errington - Cambridge, GB
Ian Collins - Cambridge, GB
Geoffrey Foote - Cambridge, GB
Julian Haines - Cambridge, GB
Robert J. Bolender - Davis CA, US
Gareth J. McCaughan - Cambridge, GB
Assignee:
Synaptics (UK) Limited - Cambridge
International Classification:
G09G 5/00
Abstract:
A low cost x-y digitizing system is described for use in consumer electronic devices, such as portable digital assistants, mobile telephones, web browsers and the like. The digitizer includes a resonant stylus, an excitation winding for energizing the resonant stylus and a set of sensor windings for sensing the signal generated by the stylus, from which the x-y position of the stylus is determined. A novel stylus design is described together with novel digitizer windings and novel excitation and processing circuitry.