Capacitive touch sensor

A projected capacitive touch sensor, comprising:

• a sensor grid (a) that includes a trace that (i) has a trace start point and a trace end point, (ii) is electrically conductive between the trace start point and the trace end point, and (iii) is formed in one or more pairs of trace cells that each include a first trace cell and a second trace cell that is rotationally symmetrical to the first trace cell and (b) that includes additional traces that each (i) have trace axes that are approximately perpendicular to a trace axis of the trace and (ii) are radially symmetrical to the trace,
• wherein the trace start point and the trace end point define the trace axis,
• wherein a trace direction is defined from the trace start point to the trace end point,
• wherein a trace-perpendicular direction is defined as being perpendicular to the trace direction,
• wherein a segment of the trace that is formed in the first trace cell comprises:
• a first portion of the trace that starts at a first point on the trace axis and that is formed in the trace direction and in the trace-perpendicular direction;
• a second portion of the trace that starts at an end point of the first portion and that is formed in a direction opposite the trace direction and in the trace-perpendicular direction;
• a third portion of the trace that starts at an end point of the second portion and that is formed in the trace direction and in the trace-perpendicular direction;
• a fourth portion of the trace that starts at an end point of the third portion, that ends at a second point on the trace axis, and that is formed in the trace direction and in a direction opposite the trace-perpendicular direction.

A projected capacitive touch sensor, comprising:

• a sensor grid (a) that includes a trace that (i) has a trace start point and a trace end point, (ii) is electrically conductive between the trace start point and the trace end point, and (iii) is formed in one or more pairs of trace cells that each include a first trace cell and a second trace cell that is rotationally symmetrical to the first trace cell and (b) that includes additional traces that each (i) have trace axes that are approximately perpendicular to a trace axis of the trace and (ii) are radially symmetrical to the trace,
• wherein the trace start point and the trace end point define the trace axis,
• wherein a trace direction is defined from the trace start point to the trace end point,
• wherein a trace-perpendicular direction is defined as being perpendicular to the trace direction,
• wherein a segment of the trace that is formed in the first trace cell comprises:
• a first portion of the trace that starts at a first point on the trace axis and that is formed in the trace direction and in the trace-perpendicular direction;
• a second portion of the trace that starts at an end point of the first portion and that is formed in the trace direction and in a direction that is opposite the trace-perpendicular direction;
• a third portion of the trace that starts at an end point of the second portion and that is formed in the trace direction and in the trace-perpendicular direction;
• a fourth portion of the trace that starts at an end point of the third portion, that ends at a second point on the trace axis, and that is formed in the trace direction and in the direction opposite the trace-perpendicular direction.

A projected capacitive touch sensor, comprising:

• a sensor grid that includes a trace that (i) has a trace start point and a trace end point, (ii) is electrically conductive between the trace start point and the trace end point, and (iii) is formed in one or more pairs of trace cells that each include a first trace cell and a second trace cell that is rotationally symmetrical to the first trace cell,
• wherein the trace start point and the trace end point define a trace axis,
• wherein a trace direction is defined from the trace start point to the trace end point,
• wherein a trace-perpendicular direction is defined as being perpendicular to the trace direction,
• wherein a segment of the trace that is formed in the first trace cell comprises:
• a first curved portion of the trace that starts at a first point on the trace axis and that is concave in a direction opposite the trace direction;
• a second curved portion of the trace that starts at an end point of the first curved portion and that is convex in a direction opposite the trace direction and in the trace-perpendicular direction;
• a third curved portion of the trace that starts at an end point of the second curved portion and that is concave in the trace-perpendicular direction;
• a fourth curved portion of the trace that starts at an end point of the third curved portion and that is convex in the trace direction and in the trace-perpendicular direction;
• a fifth curved portion of the trace that starts at an end point of the fourth curved portion, that ends at a second point on the trace axis and that is concave in the trace direction.