DISPLAY DEVICE
In a display device including a capacitive coupling touch panel, reaction to touch with nonconductive input means is achieved, and highly accurate position detection is realized with a small number of electrodes even with a small touch area. X-electrodes and Y-electrodes which intersect with each other via a first insulating layer and a Z-electrode which is in a floating state via a second insulating layer are disposed. For the Z-electrode, a material whose thickness changes by pressing due to touch, such as an elastic conductive material, is used. The Z-electrode is arranged so as to overlap both the X-electrode and the Y-electrode neighboring to each other. A pad portion of the X-electrode has a shape such that an area is maximized in the vicinity of a fine line portion of the relevant X-electrode.
1 . A display device comprising:
a capacitive touch panel,
the capacitive touch panel including a plurality of X-electrodes, a plurality of Y-electrodes, and a Z-electrode,
the X-electrode and the Y-electrode intersecting with each other via a first insulating layer at an intersecting portion, each of the X-electrode and the Y-electrode being formed such that pad portions and fine line portions are alternately arranged in its extending direction, the pad portion of the X-electrode and the pad portion of the Y-electrode being arranged so as not to overlap each other as viewed in plan,
the Z-electrode being formed so as to overlap, via a second insulating layer, both the X-electrode and the Y-electrode neighboring to each other as viewed in plan,
the Z-electrode being electrically floating,
one of the X-electrode and the Y-electrode being sequentially applied with a pulse signal, and a change in the signal being detected from the other electrode, wherein
the Z-electrode is formed of an elastic conductive material, and
the intersecting portion is formed in a different layer from the X-electrode or the Y-electrode.
2 . The display device according to claim 1 , wherein
the second insulating layer changes in thickness by pressing.
3 . The display device according to claim 1 , wherein
a thickness of the second insulating layer is maintained with a spacer.
4 . The display device according to claim 1 , wherein
the pad portion of the X-electrode extends to the vicinities of fine line portions of X-electrodes neighboring to the relevant X-electrode,
the relevant X-electrode has a shape in the pad portion such that, as viewed in plan, an area is minimized in the vicinity of the fine line portion of one of the neighboring X-electrodes and maximized in the vicinity of the fine line portion of the relevant X-electrode, and
the area of the relevant pad portion decreases from the vicinity of the fine line portion of the relevant X-electrode toward the vicinity of the fine line portion of the other neighboring X-electrode.
5 . The display device according to claim 1 , wherein
the pad portion of the X-electrode extends to the vicinities of fine line portions of X-electrodes neighboring to the relevant X-electrode,
the pad portion of the relevant X-electrode has a shape such that, as viewed in plan, an electrode width is minimized in both the vicinities of the fine line portions of the neighboring X-electrodes and maximized in the vicinity of the fine line portion of the relevant X-electrode,
the pad portion of the Y-electrode has a shape such that, as viewed in plan, a width in an extending direction of the X-electrode is constant relative to an extending direction of the Y-electrode, and
the pad portions of the X-electrode and the pad portions of the Y-electrode are alternately arranged in the extending direction of the X-electrode as viewed in plan.
6 . The display device according to claim 1 , wherein
in the pad portions of the two neighboring X-electrodes, the pad portion has a convex shape toward the neighboring X-electrode.
7 . The display device according to claim 1 , wherein
in the pad portions of the three neighboring X-electrodes, the pad portion has a convex shape toward one of the neighboring X-electrodes and has a concave shape toward the other X-electrode.
8 . The display device according to claim 1 , wherein
the Z-electrode is stacked with an elastic insulating film.
9 . The display device according to claim 1 , wherein
the Z-electrode is stacked on a supporting layer.
10 . A display device comprising:
a capacitive touch panel which detects touch position coordinates on a display region by a capacitive system,
the capacitive touch panel including a plurality of X-electrodes, a plurality of Y-electrodes, and a Z-electrode,
the X-electrode and the Y-electrode intersecting with each other via a first insulating layer at an intersecting portion, each of the X-electrode and the Y-electrode being formed such that pad portions and fine line portions are alternately arranged in its extending direction, the pads portion of the X-electrode and the pad portions of the Y-electrode being arranged so as not to overlap each other as viewed in plan,
the Z-electrode being formed so as to overlap, via a second insulating layer, both the plurality of X-electrodes and the plurality of Y-electrodes as viewed in plan,
the Z-electrode being electrically floating,
one of the X-electrode and the Y-electrode being sequentially applied with a pulse signal, and a change in the signal being detected from the other electrode, wherein
the Z-electrode is formed of an elastic conductive material, and
the intersecting portion is formed in a different layer from the X-electrode or the Y-electrode.
11 . The display device according to claim 10 , wherein
the Z-electrode is stacked with an elastic insulating film.
12 . The display device according to claim 10 , wherein
the Z-electrode is a solid electrode.
13 . A display device comprising:
a capacitive touch panel which detects touch position coordinates on a display region by a capacitive system,
the capacitive touch panel including a plurality of X-electrodes, a plurality of Y-electrodes, and a Z-electrode,
the X-electrode and the Y-electrode intersecting with each other via a first insulating layer at an intersecting portion, each of the X-electrode and the Y-electrode being formed such that individual electrodes and the intersecting portions are alternately arranged in its extending direction, the individual electrode of the X-electrode and the individual electrode of the Y-electrode being arranged without overlapping each other as viewed in plan,
the Z-electrode being formed so as to overlap, via a second insulating layer, both the X-electrode and the Y-electrode as viewed in plan,
the Z-electrode being electrically floating,
the second insulating layer being formed of a gas whose volume changes by pressure,
one of the X-electrode and the Y-electrode being sequentially applied with a pulse signal, and a change in the signal being detected from the other electrode, wherein
the Z-electrode is formed of an elastic material, and
the intersecting portion is formed in a different layer from the X-electrode or the Y-electrode.
14 . The display device according to claim 13 , wherein
the second insulating layer is air.