DIGITISER
1 Assignment
0 Petitions
Accused Products
Abstract
A digitiser includes a grid of conductors having excitation conductors and detection conductors. Excitation circuitry applies excitation signals to selected excitation conductors; measurement circuitry obtains measurements from selected detection conductors; and processing circuitry processes measurements obtained by the measurement 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 includes a sequence of excitation intervals during each of which a different pair of neighboring excitation conductors is selected by the excitation circuitry and to which complementary excitation signals are applied. 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.
52 Citations
113 Claims
-
1-43. -43. (canceled)
-
44. A digitiser comprising:
-
a grid of conductors having a plurality of excitation conductors and a plurality of detection conductors; excitation circuitry for applying excitation signals to selected excitation conductors; measurement circuitry for obtaining measurements of signals obtained from selected detection conductors; and processing circuitry for processing measurements obtained by the measurement circuitry to detect one or more objects positioned adjacent the grid of conductors; wherein the measurements obtained from the measurement circuitry comprise differential measurements and wherein the processing circuitry is operable to; process the differential measurements to identify one or more possible areas of touch and, for each possible area of touch, a start point and an end point for the possible area of touch; and integrate the differential measurements using the identified start point and end point to restrict the integration of the differential measurements to the differential measurements from the identified start point to the identified end point. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
-
-
65-111. -111. (canceled)
-
112. A digitizing method comprising:
-
providing a grid of conductors comprising a plurality of excitation conductors and a plurality of detection conductors; applying excitation signals to selected excitation conductors; obtaining measurements from selected detection conductors; and processing obtained measurements to detect one or more objects positioned adjacent the grid of conductors; wherein the measurements obtained from the measurement circuitry comprise differential measurements and wherein the processing includes; processing the differential measurements to identify one or more possible areas of touch and, for each possible area of touch, a start point and an end point for the possible area of touch; and integrating the differential measurements using the identified start point and end point to restrict the integration of the differential measurements to the differential measurements from the identified start point to the identified end point.
-
-
113-120. -120. (canceled)
Specification