Self-capacitive touch panel
A self-capacitive touch panel including a border electrode and a central electrode is provided. The border electrode has a first centroid. The central electrode has a second centroid A first average distance from the first centroid to all possible touch points in the border electrode is smaller than a second average distance from the second centroid to all possible touch points in the central electrode.
1. A self-capacitive touch panel, comprising:
a border electrode, having a first centroid representing a position at which a detected capacitance change of the border electrode occurs; and
a central electrode, having a second centroid representing a position at which a detected capacitance change of the central electrode occurs;
wherein, a first average distance from the first centroid to all possible touch points in the border electrode is smaller than a second average distance from the second centroid to all possible touch points in the central electrode.
2. The self-capacitive touch panel according to claim 1 , the first centroid having a first coordinate, the second centroid having a second coordinate, the self-capacitive touch panel further comprising:
a first sensor, coupled to the border electrode, for detecting a first capacitance change occurring at the border electrode;
a second sensor, coupled to the central electrode, for detecting a second capacitance change occurring at the central electrode; and
a controller, for determining a position of a touch point according to a product of the first coordinate and the first capacitance change and a product of the second coordinate and the second capacitance change.
3. The self-capacitive touch panel according to claim 1 , wherein a planar shape of the border electrode is similar to a first right-angle triangle, the central electrode comprises a plurality of central sub-electrodes each having a planar shape similar to a second right-angle triangle, a shortest side of the first right-angle triangle is shorter than a shortest side of the second right-angle triangle, and a second shortest side of the first right-angle triangle is equal to a second shortest side of the second right-angle triangle.
4. The self-capacitive touch panel according to claim 1 , wherein the central electrode comprises a plurality of central sub-electrodes each having a planar shape similar to a first right-angle triangle, the border electrode comprises a plurality of border sub-electrodes each having a planar shape similar to a second right-angle triangle, a shortest side of the first right-angle triangle is shorter than a shortest side of the second right-angle triangle, and a second shortest side of the first right-angle triangle is equal to a second shortest side of the second right-angle triangle.
5. The self-capacitive touch panel according to claim 1 , wherein the central electrode comprises a plurality of central sub-electrodes, and a planar shape of the border electrode and the central sub-electrodes is similar to a right-angle triangle.
6. The self-capacitive touch panel according to claim 1 , wherein a planar shape of the border electrode is similar to a first right-angle triangle, a planar shape of the central electrode is similar to a second right-angle triangle, a shortest side of the first right-angle triangle is shorter than a shortest side of the second right-angle triangle, and a second shortest side of the first right-angle triangle is equal to a second shortest side of the second right-angle triangle.
7. The self-capacitive touch panel according to claim 1 , wherein a planar shape of the border electrode is similar to a first parallelogram, a planar shape of the central electrode is similar to a second parallelogram, a first side of the first parallelogram is equal to a second side of the second parallelogram, and a first height of the first parallelogram perpendicular to the first side is shorter than a second height of the second parallelogram perpendicular to the second side.
8. A self-capacitive touch panel, comprising:
a border electrode, having a first centroid representing a position at which a detected capacitance change of the border electrode occurs, comprising a plurality of border sub-electrodes;
a central electrode, having a second centroid representing a position at which a detected capacitance change of the central electrode occurs, comprising a plurality of central sub-electrodes;
a first sensor, comprising a plurality of first sub-sensors, wherein each of the first sub-sensors is coupled to a first border sub-electrode of the border sub-electrodes to detect a first capacitance change occurring at the border electrode; and
a second sensor, comprising a plurality of second sub-sensors, wherein each of the second sub-sensors is coupled to a first central sub-electrode of the central sub-electrodes to detect a second capacitance change occurring at the central electrode.
9. The self-capacitive touch panel according to claim 8 , the first centroid having a first coordinate, the second centroid having a second coordinate, the self-capacitive touch panel further comprising:
a controller, for determining a position of a touch point according to a product of the first coordinate and the first capacitance change and a product of the second coordinate and the second capacitance change.