Variable-Pitch Tracking For Touch Sensors
In one embodiment, a touch sensor includes a touch-sensitive area, a first set of electrodes, a first set of connection pads, and a first set of tracks. The first set of tracks electrically couple the first set of connection pads of the touch sensor to the first set of electrodes of the touch sensor. A first portion and a second portion of the first set of tracks extend along an edge of the touch-sensitive area of the touch sensor. The first portion of the first set of tracks are closer in distance to the first set of connection pads than the second portion of the first set of tracks. A first pitch between two tracks of the first portion of the first set of tracks is less than a second pitch between the two tracks of the second portion of the first set of tracks.
1 .- 20 . (canceled)
21 . A touch sensor comprising:
a touch-sensitive area;
a first set of electrodes;
a first set of connection pads; and
a first set of tracks, the first set of tracks configured to electrically couple the first set of connection pads of the touch sensor to the first set of electrodes of the touch sensor, a first portion and a second portion of the first set of tracks extending along an edge of the touch-sensitive area of the touch sensor, the first portion of the first set of tracks being closer in distance to the first set of connection pads than the second portion of the first set of tracks;
wherein a first pitch between two tracks of the first portion of the first set of tracks is less than a second pitch between the two tracks of the second portion of the first set of tracks.
22 . The touch sensor of claim 21 , further comprising:
a second set of electrodes;
a second set of connection pads; and
a second set of tracks, the second set of tracks configured to electrically couple the second set of connection pads of the touch sensor to the second set of electrodes of the touch sensor, a first portion and a second portion of the second set of tracks extending along the edge of the touch-sensitive area of the touch sensor, the first portion of the second set of tracks being closer in distance to the second set of connection pads than the second portion of the second set of tracks;
wherein the first portion of the second set of tracks comprises more tracks than the second portion of the second set of tracks.
23 . The touch sensor of claim 22 , wherein:
a third portion of the second set of tracks extends along the edge of the touch-sensitive area of the touch sensor, the second portion of the second set of tracks being closer in distance to the second set of connection pads than the third portion of the second set of tracks; and
the second portion of the second set of tracks comprises more tracks than the third portion of the second set of tracks.
24 . The touch sensor of claim 22 , wherein:
the first set of electrodes are sense electrodes; and
the second set of electrodes are drive electrodes.
25 . The touch sensor of claim 22 , further comprising a third set of tracks, wherein the third set of tracks are ground lines that extend along the edge of the touch-sensitive area of the touch sensor between the first set of tracks and the second set of tracks.
26 . The touch sensor of claim 21 , wherein the first set of tracks are arranged in a cascading pattern.
27 . The touch sensor of claim 21 , wherein the first pitch between the two tracks of the first portion of the first set of tracks being less than the second pitch between the two tracks of the second portion of the first set of tracks is caused at least in part by a separation distance between the two tracks.
28 . The touch sensor of claim 21 , wherein the first pitch between the two tracks of the first portion of the first set of tracks being less than the second pitch between the two tracks of the second portion of the first set of tracks is caused at least in part by different widths of the two tracks.
29 . The touch sensor of claim 21 , further comprising bridges configured to electrically couple the two tracks of the first set of tracks to the first set of connection pads.
30 . The touch sensor of claim 21 , wherein the first set of electrodes is made of a mesh of fine lines of conductive material.
31 . A device comprising:
a touch sensor comprising:
a touch-sensitive area;
a first set of electrodes;
a first set of connection pads; and
a first set of tracks, the first set of tracks configured to electrically couple the first set of connection pads of the touch sensor to the first set of electrodes of the touch sensor, a first portion and a second portion of the first set of tracks extending along an edge of the touch-sensitive area of the touch sensor, the first portion of the first set of tracks being closer in distance to the first set of connection pads than the second portion of the first set of tracks;
wherein a first pitch between two tracks of the first portion of the first set of tracks is less than a second pitch between the two tracks of the second portion of the first set of tracks; and
a computer-readable non-transitory storage medium embodying logic that is configured when executed to control the touch sensor.
32 . The device of claim 31 , the touch sensor further comprising:
a second set of electrodes;
a second set of connection pads; and
a second set of tracks, the second set of tracks configured to electrically couple the second set of connection pads of the touch sensor to the second set of electrodes of the touch sensor, a first portion and a second portion of the second set of tracks extending along the edge of the touch-sensitive area of the touch sensor, the first portion of the second set of tracks being closer in distance to the second set of connection pads than the second portion of the second set of tracks;
wherein the first portion of the second set of tracks comprises more tracks than the second portion of the second set of tracks.
33 . The device of claim 32 , wherein:
a third portion of the second set of tracks extends along the edge of the touch-sensitive area of the touch sensor, the second portion of the second set of tracks being closer in distance to the second set of connection pads than the third portion of the second set of tracks; and
the second portion of the second set of tracks comprises more tracks than the third portion of the second set of tracks.
34 . The device of claim 32 , wherein:
the first set of electrodes are sense electrodes; and
the second set of electrodes are drive electrodes.
35 . The device of claim 32 , the touch sensor further comprising a third set of tracks, wherein the third set of tracks are ground lines that extend along the edge of the touch-sensitive area of the touch sensor between the first set of tracks and the second set of tracks.
36 . The device of claim 31 , wherein the first set of tracks are arranged in a cascading pattern.
37 . The device of claim 31 , wherein the first pitch between the two tracks of the first portion of the first set of tracks being less than the second pitch between the two tracks of the second portion of the first set of tracks is caused at least in part by a separation distance between the two tracks.
38 . The device of claim 31 , wherein the first pitch between the two tracks of the first portion of the first set of tracks being less than the second pitch between the two tracks of the second portion of the first set of tracks is caused at least in part by different widths of the two tracks.
39 . The device of claim 31 , the touch sensor further comprising bridges configured to electrically couple the two tracks of the first set of tracks to the first set of connection pads.
40 . The device of claim 31 , wherein the first set of electrodes is made of a mesh of fine lines of conductive material.