| 摘要 |
<p>A Digitiser includes grid of conductors including excitation conductors detection conductors; excitation circuitry for applying signals to selected excitation conductors; measurement circuitry for obtaining measurements from selected detection conductors; and processing circuitry to detect one or more objects positioned adjacent the grid of conductors. The excitation circuitry may be arranged to operate in a cyclic manner to select each of the excitation conductors during an excitation cycle, wherein an excitation cycle comprises a sequence of excitation intervals during each of which a different pair of neighbouring excitation conductors is selected by the excitation circuitry and to which complementary excitation signals are applied, and wherein the excitation circuitry is arranged to polarity modulate each excitation signal using a polarity control signal so that the polarity of the excitation signal applied to a selected conductor changes during a time that the excitation conductor is selected. Alternatively the consecutive pairs may be chosen in an overlapping manner. Measurement circuitry may function in a similar manner in choosing pairs of conductors. Control circuitry may be arranged to generate control signals on a cyclic basis independently of the processing circuitry. A method of making a transducer making use of various adhesive layers and ultrasonic bonding is also present.</p> |
