TOUCH SENSING DEVICE AND A DETECTION METHOD

摘要

A touch sensor having a touch sensitive film, a signal filter, electrical circuitry and a processing unit. The film is capable of capacitive or inductive coupling to an external object when a touch is made by the object. The signal filter is formed by the resistance of the film and the capacitive or inductive coupling to the external object, and the filter has properties affected by location of the touch and/or capacitance or inductance of the touch. The electrical circuitry is coupled to the touch sensitive film and configured to supply excitation, amplitude and wave form into the signal filter and to receive response signals from the signal filter. The processing unit is configured to detect the presence or proximity of a touch, the location of said touch, the capacitance and/or inductance of said touch by processing response signals and thereby measuring changes in the properties of the signal filter.

主权项

1. A touch sensing device, comprising:
a touch sensitive film comprising conductive material having a resistance, the film being capable of capacitive or inductive coupling to an external object when a touch is made by said external object, a signal filter formed at least by the resistance of the touch sensitive film and the capacitive or inductive coupling to the external object, the signal filter having properties that are affected at least by the location of the touch, the capacitance or inductance of the touch or by a combination of said properties of the touch, electrical circuitry resistively or wirelessly coupled to the touch sensitive film at one or more locations, the electrical circuitry being configured to supply one or more excitation signals having at least one frequency, amplitude and wave form into the signal filter and to receive one or more response signals from the signal filter, and a processing unit resistively or wirelessly coupled to the electrical circuitry, wherein the processing unit is configured to detect the presence or proximity of a touch by the external object, the location of said touch, the capacitance or inductance of said touch, or a combination thereof by processing one or more response signals and thereby measuring changes in the properties of the signal filter.