Touch panel and touch panel device
A touch panel includes X electrodes and Y electrodes disposed on a support substrate in such a manner that each of the Y electrodes intersects the X electrodes, X floating electrodes laminated on a first insulating layer at places opposed to the X electrodes, Y floating electrodes laminated on the first insulating layer at places opposed to the Y electrodes, and a second insulating layer covering the X floating electrodes and the Y floating electrodes. The area of X electrodes is smaller than the area of X floating electrodes and the area of Y electrodes is smaller than the area of Y floating electrodes in a unit lattice region of a lattice formed of the X electrodes and the Y electrodes. A mutual capacitance generated between an X electrode and a Y electrode decreases when a surface of the second insulating layer is touched by a pointer.
1. A touch panel comprising:
a support substrate;
a plurality of X electrodes disposed on the support substrate;
a plurality of Y electrodes disposed on the support substrate in such a manner that each of the plurality of Y electrodes intersects the plurality of X electrodes and is isolated from the plurality of X electrodes;
a plurality of X floating electrodes laminated on a first insulating layer at places opposed to the plurality of X electrodes;
a plurality of Y floating electrodes laminated on the first insulating layer at places opposed to the plurality of Y electrodes; and
a second insulating layer covering the plurality of X floating electrodes and the plurality of Y floating electrodes,
wherein area of X electrodes is smaller than area of X floating electrodes and area of Y electrodes is smaller than area of Y floating electrodes in a unit lattice region of a lattice formed of the plurality of X electrodes and the plurality of Y electrodes,
wherein a mutual capacitance generated between an X electrode and a Y electrode decreases when a surface of the second insulating layer is touched by a pointer, and
wherein, in areas where the plurality of X floating electrodes and the plurality of Y floating electrodes are separated and the plurality of X electrodes and the plurality of Y electrodes are separated in planar view, the plurality of X floating electrodes are separated from the plurality of Y electrodes and the plurality of Y floating electrodes are separated from the plurality of X electrodes in planar view.
2. The touch panel according to claim 1 ,
wherein the plurality of X floating electrodes and the plurality of Y floating electrodes are island-like electrodes separated from the other electrodes.
3. The touch panel according to claim 1 ,
wherein thickness from top faces of the plurality of X electrodes to the surface of the second insulating layer is not more than 50 μm, and
wherein thickness from top faces of the plurality of Y electrodes to the surface of the second insulating layer is not more than 50 μm.
4. The touch panel according to claim 1 ,
wherein the pointer is a finger or a conductor electrically coupled to the finger, and
wherein the following condition is satisfied:
C f2 <C nt +√{square root over ( C nt 2 +C nt C b )}
where C f2 represents a combined capacitance obtained by connecting a capacitance generated between an X floating electrode and the pointer and a capacitance generated between the X floating electrode and the X electrode facing the X floating electrode in series or a combined capacitance obtained by connecting a capacitance generated between a Y floating electrode and the pointer and a capacitance generated between the Y floating electrode and the Y electrode facing the Y floating electrode in series; C nt represents a mutual capacitance generated between the X electrode and the Y electrode when the surface of the second insulating layer is not touched by the pointer; and C b represents a body capacitance of a human having the finger.
5. The touch panel according to claim 1 , wherein the plurality of X electrodes, the plurality of Y electrodes, the plurality of X floating electrodes, and the plurality of Y floating electrodes are used to present a texture to the pointer, which is a finger.
6. A touch panel device comprising:
the touch panel according to claim 1 ; and
a controller for the touch panel,
wherein the controller is configured to determine a touch point on the touch panel by measuring a variation in mutual capacitance between each of the plurality of X electrodes and each of the plurality of Y electrodes with a driving signal having an angular frequency ω,
wherein the pointer is a finger or a conductor electrically coupled with the finger, and
wherein the following condition is satisfied:
Z
2
Z
1
2
+
2
Z
1
Z
2
<
j
ω
C
n
t
where Z 1 represents a combined impedance obtained by connecting a capacitance generated between an X floating electrode and the pointer and a capacitance generated between the X floating electrode and the X electrode facing the X floating electrode in series or a combined impedance obtained by connecting a capacitance generated between a Y floating electrode and the pointer and a capacitance generated between the Y floating electrode and the Y electrode facing the Y floating electrode in series; Z 2 represents a impedance of a body of a human having the finger; C nt represents a mutual capacitance generated between the X electrode and the Y electrode when the surface of the second insulating layer is not touched by the pointer; and j represents an imaginary number.
7. A touch panel device comprising
the touch panel according to claim 1 ; and
a controller for the touch panel,
wherein the controller is configured to determine a touch point on the touch panel by measuring a variation in mutual capacitance between each of the plurality of X electrodes and each of the plurality of Y electrodes with a driving signal having an angular frequency ω,
wherein the pointer is a finger or a conductor electrically coupled with the finger, and
wherein the following, condition is satisfied:
C
f
2
4
(
1
+
ω
2
C
b
2
R
b
2
)
(
C
b
+
2
C
f
2
)
2
+
4
ω
2
C
b
2
C
f
2
2
R
b
2
<
C
n
t
2
where C f2 represents a combined capacitance obtained by connecting a capacitance generated between an X floating electrode and the pointer and a capacitance generated between the X floating electrode and the X electrode facing the X floating electrode in series or a combined capacitance obtained by connecting a capacitance generated between a Y floating electrode and the pointer and a capacitance generated between the Y floating electrode and the Y electrode facing the Y floating electrode in series; C nt represents a mutual capacitance generated between the X electrode and the Y electrode when the surface of the second insulating layer is not touched by the pointer; C b represents a body capacitance of a human having the finger; and R b represents a body resistance of the human having the finger.
8. A tactile touch panel device comprising:
the touch panel according to claim 1 ; and
a controller for the touch panel,
wherein the controller is configured to:
determine a touch point on the touch panel by measuring a variation in mutual capacitance between each of the plurality of X electrodes and each of the plurality of Y electrodes with a driving signal; and
present a texture by supplying the X electrodes and the Y electrodes other than the X electrodes and the Y electrodes used to measure mutual capacitances with driving signals at different frequencies having a predetermined frequency difference.
9. The touch panel according to claim 1 ,
wherein the pointer is a finger or a conductor electrically coupled to the finger, and
wherein the following condition is satisfied:
C
f
2
<
C
n
t
+
C
n
t
2
+
C
nt
×
10
-
10
where C f2 represents a combined capacitance obtained by connecting a capacitance generated between an X floating electrode and the pointer and a capacitance generated between the X floating electrode and the X electrode facing the X floating electrode in series or a combined capacitance obtained by connecting a capacitance generated between a Y floating electrode and the pointer and a capacitance generated between the Y floating electrode and the Y electrode facing the Y floating electrode in series and C nt represents a mutual capacitance generated between the X electrode and the Y electrode when the surface of the second insulating layer is not touched by the pointer.
10. A touch panel device comprising:
the touch panel according to claim 1 ; and
a controller for the touch panel,
wherein the controller is configured to determine a touch point on the touch panel by measuring a variation in mutual capacitance between each of the plurality of X electrodes and each of the plurality of Y electrodes with a driving signal having an angular frequency ω,
wherein the pointer is a finger or a conductor electrically coupled with the finger, and
wherein the following condition is satisfied
500
(
-
2
j
×
10
7
+
3
ω
)
Z
1
{
-
2
j
×
10
10
+
ω
(
3000
+
Z
1
)
}
<
j
ω
C
n
t
where Z 1 represents a combined impedance obtained by connecting a capacitance generated between an X floating electrode and the pointer and a capacitance generated between the X floating electrode and the X electrode facing the X floating electrode in series or a combined impedance obtained by connecting a capacitance generated between a Y floating electrode and the pointer and a capacitance generated between the Y floating electrode and the Y electrode facing the Y floating electrode in series; and j represents an imaginary number.
11. A touch panel device comprising:
the touch panel according to claim 1 ; and
a controller for the touch panel,
wherein the controller is configured to determine a touch point on the touch panel by measuring a variation in mutual capacitance between each of the plurality of X electrodes and each of the plurality of Y electrodes with a driving signal having an angular frequency ω,
wherein the pointer is a finger or a conductor electrically coupled with the finger, and
wherein the following condition is satisfied:
C
f
2
4
(
1
+
2.25
×
10
-
14
×
ω
2
)
(
1
×
10
-
10
+
2
C
f
2
)
2
+
9
×
10
-
14
×
C
f
2
2
ω
2
<
C
n
t
2
where C f2 represents a combined capacitance obtained by connecting a capacitance generated between an X floating electrode and the pointer and a capacitance generated between the X floating electrode and the X electrode facing the X floating electrode in series or a combined capacitance obtained by connecting a capacitance generated between a Y floating electrode and the pointer and a capacitance generated between the Y floating electrode and the Y electrode facing the Y floating electrode in series; and C nt represents a mutual capacitance generated between the X electrode and the Y electrode when the surface of the second insulating layer is not touched by the pointer.