Touch panel, display panel, and display unit
View Patent ↗A touch panel, a display panel, and a display unit achieving prevention of erroneous detection caused by external noise, are provided. The touch panel includes: a plurality of detection scan electrodes extending in a first direction; and a plurality of detection electrodes facing the plurality of detection scan electrodes and extending in a second direction which intersects the first direction. A ratio of fringe capacitance to total capacitance between one or more selected detection scan electrodes and a first detection electrode is different from a ratio of fringe capacitance to total capacitance between the one or more selected detection scan electrodes and a second detection electrode. The one or more selected detection scan electrodes are selected, in a desired unit, from the plurality of detection scan electrodes, to be supplied with a selection pulse, and each of the first and the second detection electrodes is selected from the plurality of detection electrodes.
1. A touch panel comprising:
a scan-side substrate;
a detection-side substrate;
scan electrodes on the scan-side substrate, each scan electrode having an elongated shape along a first direction, each scan electrode being an electrode to which a selection drive voltage is applied;
detection electrodes facing the scan electrodes, each detection electrode having an elongated shape along a second direction which intersects the first direction, each detection electrode being an electrode from which a detection output signal is obtained; and
a dielectric between the scan electrodes and the detection electrodes,
wherein,
one or more of the scan electrodes are selectable by the application of the selection drive voltage,
each detection electrode crosses the scan electrodes, and, proceeding along the first direction and along any of the scan electrodes, separate areas of overlap where the detection electrodes face the scan electrode are alternatingly different,
each of the detection electrodes has a detection electrode extending part extending along the second direction and detection electrode projecting parts extending along the first direction, and
the detection electrode projecting parts only overlap alternate scan electrodes.
2. The touch panel according to claim 1 , wherein a first ratio of fringe capacitance, between the one or more selected scan electrodes and the detection electrode projecting parts of a given detection electrode, to a total capacitance, between the one or more selected scan electrodes and the detection electrode projecting parts of the given detection electrode, is different than a second ratio of fringe capacitance, between the one or more selected scan electrodes and the detection electrode extending parts of the given detection electrode, to the total capacitance, between the one or more selected scan electrodes and the detection electrode extending parts of the given detection electrode.
3. The touch panel according to claim 1 , wherein each scan electrode has an elongated shape of constant width.
4. A touch panel comprising:
a scan-side substrate;
a detection-side substrate;
scan electrodes on the scan-side substrate, each scan electrode having an elongated shape along a first direction, each scan electrode being an electrode to which a selection drive voltage is applied;
detection electrodes facing the scan electrodes, each detection electrode having an elongated shape along a second direction which intersects the first direction, each detection electrode being an electrode from which a detection output signal is obtained; and
a dielectric between the scan electrodes and the detection electrodes,
wherein,
one or more of the scan electrodes are selectable by the application of the selection drive voltage,
each detection electrode crosses the scan electrodes, and, proceeding along the first direction and along any of the scan electrodes, separate areas of overlap where the detection electrodes face the scan electrode are alternatingly different,
each of the scan electrodes has a scan electrode extending part extending along the first direction and scan electrode projecting parts extending along the second direction, and
line widths of the scan electrodes in regions overlapping the detection electrodes are different for those regions overlapping the scan electrode projecting parts than those regions overlapping the scan electrode extending parts.
5. The touch panel according to claim 4 , wherein a first ratio of fringe capacitance, between the detection electrodes and the scan electrode projecting parts of the one or more selected scan electrodes, to a total capacitance, between the detection electrodes and the scan electrode projecting parts of the one or more selected scan electrodes, is different from a second ratio of fringe capacitance, between the detection electrodes and the scan electrode extending parts of the one or more selected scan electrodes, to the total capacitance, between the detection electrodes and the scan electrode extending parts of the one or more selected scan electrodes.
6. The touch panel according to claim 4 , wherein each detection electrode has an elongated shape of constant width.
7. A touch panel comprising:
a scan-side substrate;
a detection-side substrate;
scan electrodes on the scan-side substrate, each scan electrode having an elongated shape along a first direction, each scan electrode being an electrode to which a selection drive voltage is applied;
detection electrodes facing the scan electrodes, each detection electrode having an elongated shape along a second direction which intersects the first direction, each detection electrode being an electrode from which a detection output signal is obtained, and
a dielectric between the scan electrodes and the detection electrodes,
wherein,
one or more of the scan electrodes are selectable by the application of the selection drive voltage,
the detection electrodes cross the scan electrodes,
each of the scan electrodes has (a) a scan electrode extending part extending along the first direction and (b) scan electrode projecting parts extending along the second direction, and
line widths of the scan electrodes in adjacent regions overlapping the detection electrodes are different for those regions overlapping the scan electrode projecting parts than those regions overlapping the scan electrode extending parts.
8. The touch panel according to claim 7 , a first ratio of fringe capacitance, between the detection electrodes and the adjacent regions of the scan electrode projecting parts of the one or more selected scan electrodes, to a total capacitance, between the detection electrodes and the adjacent regions of the scan electrode projecting parts of the one or more selected scan electrodes, is different from a second ratio of fringe capacitance, between the detection electrodes and the scan electrode extending parts of the one or more selected scan electrodes, to the total capacitance, between the detection electrodes and the scan electrode extending parts of the one or more selected scan electrodes.
9. A touch panel comprising:
a scan-side substrate;
a detection-side substrate;
scan electrodes on the scan-side substrate, each scan electrode having an elongated shape along a first direction, each scan electrode being an electrode to which a selection drive voltage is applied;
detection electrodes facing the scan electrodes, each detection electrode having an elongated shape along a second direction which intersects the first direction, each detection electrode being an electrode from which a detection output signal is obtained, and
a dielectric between the scan electrodes and the detection electrodes,
wherein,
one or more of the scan electrodes are selectable by the application of the selection drive voltage;
each detection electrode crosses the scan electrodes, and, proceeding along the first direction and along any of the scan electrodes, separate areas of overlap where the detection electrodes face the scan electrode are alternatingly different,
one electrode of the scan electrodes or the detection electrodes has an elongated shape of constant width, and another electrode of the scan electrodes or the detection electrodes has an elongated shape which has at least two different widths, and
the elongated shape of the another electrode has at least two portions, one of which is wider than the other, the widest portion crossing the one electrode and the narrowest portion is not crossing the one electrode.