JP2019121353A - Touch panel and touch panel device - Google Patents

Abstract

To realize a reduction in thickness and a multi-touch in a touch panel of a projection-type capacitance system.SOLUTION: A touch panel includes: a supporting substrate; a plurality of X-electrodes arranged on the supporting substrate; a plurality of Y-electrodes on the supporting substrate, which intersect with the X-electrodes and are separated from the X-electrodes; a plurality of X-floating electrodes, facing the X-electrodes and laminated with a first insulating layer in between; a plurality of Y-floating electrode, facing the Y-electrodes with a first insulating layer in between; and a second insulating layer covering the X-floating electrodes and the Y-floating electrodes. An area of each X-electrodes is smaller than that of each X-floating electrodes and an area of each Y-electrodes is smaller than an area of each Y-floating electrodes in a unit lattice region of a lattice formed of the X-electrodes and the Y-electrodes. When a surface of the second insulating layer is touched by an indicator, a relative capacity formed of the X-electrodes and the Y-electrodes is reduced.SELECTED DRAWING: Figure 1B

Description

  The present disclosure relates to a touch panel and a touch panel device.

  In recent years, with the spread of smartphones and tablet terminals, touch panels have been widely recognized as user interfaces with good operability. The touch panel is mounted on display units of various electronic devices.

  For example, Patent Document 1 discloses a touch panel and a display device that can increase detection sensitivity without changing the wiring design of the touch panel. Specifically, in a capacitive touch panel, a plurality of X electrodes extending in parallel to a first direction, a first X electrode, and an insulating material are formed on the surface of a transparent substrate. A plurality of Y electrodes extending in parallel to a second direction intersecting the direction, and separately disposed on the other surface of the substrate so as to cover respective regions where the X electrodes and the Y electrodes intersect And respective floating electrodes formed of a transparent conductive material.

  In addition, a technology has been developed which presents a texture on the surface of a touch panel by electrostatic force. For example, Patent Document 2 discloses a tactile presentation device that presents a texture on the surface of a touch panel. In the tactile sense presentation device described in Patent Document 2, a plurality of electrodes are arranged in a plane, and in a certain period, voltages for detecting a contact position are supplied to the plurality of electrodes, and in other periods, Supply voltage to multiple electrodes to present texture.

JP, 2013-167953, A International Publication No. 2014/002405

  Along with the demand for thinner display devices, it is also required to further reduce the thickness of touch panels. However, it has been found from the research of the inventor that when thinning of the projected capacitive touch panel is promoted, a problem occurs in which it is not possible to distinguish between a true touch point and a ghost point in multi-touch. Therefore, a technology capable of simultaneously achieving thinning and multi-touch in a projected capacitive touch panel is desired.

  The touch panel according to one aspect of the present disclosure is arranged to intersect the support substrate, the plurality of X electrodes arranged on the support substrate, and the plurality of X electrodes on the support substrate, and the plurality of X A plurality of Y floating electrodes insulated from the electrodes, a plurality of X floating electrodes stacked via a first insulating layer at a position facing the plurality of X electrodes, and a plurality of Y electrodes opposed to the plurality of X electrodes The plurality of Y floating electrodes stacked in the first insulating layer and the second insulating layer covering the plurality of X floating electrodes and the plurality of Y floating electrodes; In the unit lattice region of the lattice formed by the X electrode and the plurality of Y electrodes, the X electrode area is smaller than the X floating electrode area, the Y electrode area is smaller than the Y floating electrode area, and the surface of the second insulating layer is It is formed by X electrode and Y electrode when it is touched by the indicator The mutual capacitance is reduced.

  According to one aspect of the present disclosure, thinning and multi-touch can be realized in a projected capacitive touch panel.

It is a top view which shows a touch panel typically. The cross-section in the BB cutting line in FIG. 1A is shown typically. It is a top view which shows a touch panel typically. The cross-section in the BB cutting line in FIG. 1A is shown typically. It is a top view which shows a touch panel typically. The circuit model of the touch panel containing X floating electrode FX and Y floating electrode FY is shown typically. The circuit model of the touch panel of a comparative example which does not contain X floating electrode FX and Y floating electrode FY is shown. The equivalent circuit at the time of the non-touch of the comparative example shown to FIG. 2B is shown typically. The equivalent circuit at the time of the touch of the comparative example shown to FIG. 2B is shown typically. These show the calculation result of the relationship between the insulation film thickness and the signal current in a receiving electrode in the model shown to FIG. 3A and 3B. The charge amount change at the touch point by one point touch, the charge amount change at one actual touch point in the two point touch, and the charge amount change at the ghost point in the two point touch are shown. Indicates the amount of charge at a touch point at a single point touch and at a ghost point when no touch is performed. The similar simulation result of the comparative example shown to FIG. 2B is shown. The experimental result of charge amount change in the structure which made the film thickness of the insulating layer of the comparative example shown to FIG. 2B thin is shown. In the structural example shown to FIG. 2A, a circuit model when a finger is touching is shown typically. The equivalent circuit of the model of FIG. 6A is shown typically. An example of composition of a display is shown typically. 1 schematically shows a logical configuration of a tactile sense touch panel device included in a display device.

  Hereinafter, embodiments will be described with reference to the attached drawings. The embodiments are merely examples for realizing the present disclosure, and do not limit the technical scope of the present disclosure. The same reference numerals are given to the same configuration in each drawing. In order to make the description easy to understand, the dimensions and shapes of the illustrated objects may be exaggerated.

  The configuration of the touch panel (touch panel substrate) 100 will be described with reference to FIGS. 1A, 1B, and 1C. 1A and 1C are plan views schematically showing the touch panel 100. FIG. FIG. 1B schematically shows a cross-sectional structure taken along the line BB in FIG. 1A.

  The touch panel 100 includes a support substrate 101, a plurality of X electrodes X0 to X4 and a plurality of Y electrodes Y0 to Y4 disposed on the support substrate 101. The example of FIG. 1A shows five X electrodes and five Y electrodes, but the number of each of the X electrodes and the Y electrodes depends on the design of the touch panel 100. The X electrode and the Y electrode are typically formed of a transparent conductor, for example, formed of ITO or IZO.

  The plurality of X electrodes X <b> 0 to X <b> 4 extend in parallel to one side of the rectangular support substrate 101 and are arranged in parallel separately from each other. The plurality of Y electrodes Y <b> 0 to Y <b> 4 extend in parallel to the other side of the support substrate 101 and are arranged in parallel separately from each other. The X electrodes X0 to X4 and the plurality of Y electrodes Y0 to Y4 cross each other. The Y electrodes Y0 to Y4 are insulated from the X electrodes X0 to X4 via insulating films at the intersections.

  In the example of FIG. 1A, the X electrodes X0 to X4 extend in the left-right direction of the figure. The Y electrodes Y0 to Y4 extend in the vertical direction in the drawing. Each X electrode and each Y electrode are orthogonal to each other. The X electrodes X0 to X4 may not be parallel to each other, and may not be parallel to one side of the support substrate 101. The Y electrodes Y0 to Y4 may not be parallel to each other, and may not be parallel to one side of the support substrate 101. Each X electrode and each Y electrode may not be orthogonal to each other.

  In the example illustrated in FIG. 1A, the X electrodes X0 to X4 have a shape in which a plurality of rhombus-shaped portions are connected in a beaded manner via connection portions. That is, one X electrode is formed by electrically connecting the rhombic portions adjacent on the left and right via the connection portion, and extends in the left-right direction. Similarly, the Y electrodes Y0 to Y4 also have a shape in which a plurality of rhombus-shaped portions are connected in a beaded manner via connection portions. One Y electrode is formed by electrically connecting vertically adjacent rhombic portions via the connection portion, and extends in the vertical direction. In the example of FIG. 1A, both ends of each X electrode and each Y electrode are triangular portions.

  When viewed perpendicularly to the main surface of the support substrate 101 (in plan view), the X electrodes X0 to X4 and the Y electrodes Y0 to Y4 are formed such that the connection portions of the rhombus portions overlap with each other via the insulating film. It is done. The rhombic portions of the X electrodes X0 to X4 and the rhombic portions of the Y electrodes Y0 to Y4 are formed so as not to overlap with each other. That is, the rhombus portions of the X electrodes X0 to X4 and the rhombus portions of the Y electrodes Y0 to Y4 are arranged on the same plane.

The rhombic portion of each X electrode exists between two adjacent Y electrodes, and the pitch P _XD of the rhombic portion of each X electrode coincides with the pitch P _YE of the Y electrodes Y0 to Y4. The rhombic portion of each Y electrode exists between two adjacent X electrodes, and the pitch P _YD of the rhombic portion of each Y electrode corresponds to the pitch P _XE of the X electrodes X0 to X4.

  The shape of the support substrate 101 is determined by design, and may not be rectangular, and may be, for example, a polygon with five or more corners, or may have sides of a curve. The shapes of the X and Y electrodes are determined by design. In the example of FIG. 1A, for example, it may be strip-like (rectangular), or wide portions of a plurality of predetermined shapes (in the example of FIG. 1A, rhombus) may be connected in a beaded manner by narrow connection portions. It may be configured.

  A plurality of X floating electrodes FX each facing an X electrode and a plurality of Y floating electrodes FY each facing a Y electrode are arranged on the support substrate 101. The floating electrode is an electrode that is not given a specific potential and is electrically floating. In FIG. 1A, only one X floating electrode is indicated by the symbol FX, and only one Y floating electrode is indicated by the symbol FY. The X floating electrode FX and the Y floating electrode FY are typically formed of a transparent conductor, and are formed of, for example, ITO or IZO.

  In the example of FIG. 1A, each X floating electrode FX and each Y floating electrode FY are island-like and surrounded by an insulating layer, and other electrodes (here, X electrode, Y electrode, other X And isolated from the floating electrode FX and the other Y floating electrode FY). In the example of FIG. 1A, the shapes of the X floating electrode FX and the Y floating electrode FY arranged at the periphery are common and triangular. The shapes of the X floating electrode FX and the Y floating electrode FY in the inner region are common and rectangular. The shapes of the X floating electrode FX and the Y floating electrode FY depend on the design, and these shapes may be different.

  The X floating electrode FX mainly overlaps the X electrode through the insulating layer in plan view. That is, in plan view, the area of the region in which the X floating electrode FX overlaps with one or more X electrodes is larger than the area in which it overlaps with one or more Y electrodes. In the example of FIG. 1A, each X floating electrode FX overlaps with one whole of the rhombus portion of the X electrode and a part of the connecting portions at both ends thereof. In the example of FIG. 1A, each X floating electrode FX faces the portion of one X electrode sandwiched by the Y electrodes, and does not face the other X electrodes.

  In the example of FIG. 1A, a region where the X floating electrode FX and the Y electrode overlap does not exist, but a part of the X floating electrode FX may overlap the Y electrode. The X floating electrode FX is disposed above the X electrode and the Y electrode, and an insulating layer exists between them.

  The Y floating electrode FY mainly overlaps the Y electrode via the insulating layer in plan view. That is, in plan view, the area of the area where the Y floating electrode FY overlaps with the one or more Y electrodes is larger than the area where it overlaps with the one or more X electrodes. In the example of FIG. 1A, each Y floating electrode FY overlaps one whole of a rhombic portion of the Y electrode and a part of the connecting portion at both ends thereof. In the example of FIG. 1A, each Y floating electrode FY faces the portion of one Y electrode sandwiched by the X electrodes, and does not face the other Y electrodes.

  In the example of FIG. 1A, a region where the Y floating electrode FY and the X electrode overlap does not exist, but a part of the Y floating electrode FY may overlap the X electrode. The Y floating electrode FY is disposed above the X electrode and the Y electrode, and an insulating layer exists between them.

  In the example of FIG. 1A, one row of X floating electrodes FX arranged in the lateral direction is arranged in the same direction so as to overlap with one X electrode in plan view, and the center of each X floating electrode FX is X It coincides with the center of the rhombus portion of the electrode. One row of Y floating electrodes FY arranged in the vertical direction is arranged in the same direction so as to overlap with one Y electrode in plan view, and the center of each Y floating electrode FY is a rhombic portion of the Y electrode It matches the center.

  Referring to FIG. 1B, X electrodes X1 to X3, Y electrodes Y1 to Y3, an X floating electrode FX, and a Y floating electrode FY are arranged on a support substrate 101. The X electrodes X1 to X3 and the Y electrodes Y1 to Y3 are covered with the first insulating layer 102, and the X floating electrode FX and the Y floating electrode FY are covered with the second insulating layer 103. The surface 105 of the second insulating layer 103 is a touch surface touched by an indicator (for example, a finger or a conductor held by the finger). Hereinafter, the side of the touch surface 105 with respect to the support substrate 101 is referred to as the front side or the upper side. The support may be, for example, a stylus (pen) in addition to a finger. A stylus, called a passive type, is made of a conductive material, is electrically coupled to a finger, and works the same as when it is touched with a finger.

  The support substrate 101 is an insulating substrate, and is typically formed of a transparent insulating material such as resin or glass. The support substrate 101 may be a flexible substrate or an inflexible substrate.

  The X electrodes X1 to X3 and the Y electrodes Y1 to Y3 are arranged at an equal pitch in the horizontal direction of the drawing. The X electrodes and the Y electrodes are alternately arranged. In the example of FIG. 1B, the X electrodes X1 to X3 and the Y electrodes Y1 to Y3 are formed directly on (in contact with) the support substrate 101, but the support substrate 101 and the X electrodes X1 to X3 and the Y electrode Y1 are formed. An insulating layer may be present between ~ Y3.

  As shown in FIG. 1B, in this example, the X electrodes X1 to X3 and the Y electrodes Y1 to Y3 are arranged on the same plane in a region other than the intersections of the X electrodes X1 to X3 and the Y electrodes Y1 to Y3. ing. The X electrodes X1 to X3 and the Y electrodes Y1 to Y3 are covered with the first insulating layer 102. The first insulating layer 102 is composed of one or more insulating layers. The first insulating layer 102 is, for example, an acrylic resin layer.

  The X floating electrodes FX are disposed on the X electrodes X1 to X3 so as to cover the X electrodes X1 to X3, respectively. A first insulating layer 102 is present between the X floating electrode FX and the X electrodes X1 to X3. The distance between the X floating electrode FX and the X electrodes X1 to X3 is the same.

  The Y floating electrodes FY are disposed on the Y electrodes Y1 to Y3 so as to cover the Y electrodes Y1 to Y3, respectively. A first insulating layer 102 is present between the Y floating electrode FY and the Y electrodes Y1 to Y3. The distance between the Y floating electrode FY and the Y electrodes Y1 to Y3 is the same. In the example of FIG. 1B, the X floating electrode FX and the Y floating electrode FY are arranged on the same plane.

  The X floating electrode FX and the Y floating electrode FY are covered with the second insulating layer 103. The second insulating layer 103 is composed of one or more insulating layers. The second insulating layer 103 is composed of, for example, a lower acrylic resin layer and an upper cover glass, a lower silicon oxide film and an upper hard coat layer, or a lower acrylic resin layer and an upper hard layer. Composed of a coat layer. As described above, the upper surface 105 of the second insulating layer 103 is a touch surface to be touched by the indicator.

  In the example of FIGS. 1A and 1B, each of the X floating electrode FX and the Y floating electrode FY is island-shaped and is insulated from other conductors. In another example, the plurality of X floating electrodes FX may be connected by a conductor connection. For example, one row of X floating electrodes facing one X electrode may be connected in a beaded manner. A plurality of X floating electrodes connected by the connection part can also be seen as one X floating electrode.

  Similarly, the plurality of Y floating electrodes FY may be connected by a conductor connection. For example, one row of Y floating electrodes facing one Y electrode may be connected in a beaded manner. A plurality of Y floating electrodes connected by the connection part can also be seen as one Y floating electrode. By forming the X floating electrode FX and the Y floating electrode FY with a conductor insulated from another conductor in the form of an island, the X floating electrode FX and the Y floating electrode FY can be formed by an easier process.

  The X electrodes X1 to X3 and the Y electrodes Y1 to Y3 constitute a planar grid. As shown in FIGS. 1B and 1C, this planar lattice is composed of a plurality of unit lattices 110. The unit cell 110 is a repeating unit of a lattice. The unit cell 110 may have a plurality of different configurations, and FIGS. 1B and 1C show one example of the unit cell configuration. In a plan view, a region 111 defined by a line surrounding the unit cell 110 is referred to as a unit cell region.

  In the example of FIGS. 1B and 1C, the unit lattice 110 (unit lattice region 111) has a rectangular shape in plan view, and includes a part of one X electrode X1 and a part of one Y electrode Y1. The unit lattice region 111 that defines the unit lattice 110 further includes one X floating electrode FX facing the X electrode X1 and one Y floating electrode FY facing the Y electrode Y1 in plan view. Each X floating electrode FX and each Y floating electrode FY are accommodated in one unit cell area 111. The patterns of the X electrode, the Y electrode, the X floating electrode, and the Y floating electrode in the unit lattice region 111 are common.

  The unit cell 110 shown in FIG. 1C is a basic unit cell. That is, this basic unit lattice 110 is a unit lattice with the smallest area among the unit lattices. The unit cell area 111 is a basic unit cell area. That is, in the touch panel shown in FIG. 1C, one X floating electrode FX facing the X electrode X1 and one Y floating electrode facing the Y electrode Y1 different from the X floating electrode FX in the basic unit lattice region Includes FY.

  In the unit lattice region 111, the area of the X electrode X1 is smaller than the area of the X floating electrode FX. The area of the Y electrode Y1 is smaller than the area of the Y floating electrode FY. In each unit lattice region 111, the X electrode area is smaller than the X floating electrode area, and the Y electrode area is smaller than the Y floating electrode area. The number of X electrodes and Y electrodes included in one unit cell region, and the number of X floating electrodes and Y floating electrodes vary depending on the configuration of the unit cell.

  Figures 1D and 1E show other example unit cell configurations. FIG. 1D schematically shows a cross-sectional structure taken along the line BB in FIG. 1A. FIG. 1E is a plan view schematically showing the touch panel 100. FIG. In the example of FIGS. 1D and 1E, the unit lattice 110 (unit lattice region 111) has a square shape in a plan view, a part of each of the two X electrodes X2 and X3, and each of the two Y electrodes Y2 and Y3. Including some.

  The unit lattice region 111 defining the unit lattice 110 is, in a plan view, a part of one X floating electrode FX facing the X electrode X2, a part of one X floating electrode FX facing the X electrode X3, It includes a part of one Y floating electrode FY facing the Y electrode Y2 and a part of one Y floating electrode FY facing the Y electrode Y3. The patterns of the X electrode, the Y electrode, the X floating electrode, and the Y floating electrode in the unit lattice region 111 are common.

  The unit cell 110 shown in FIG. 1E is a basic unit cell. That is, this basic unit lattice 110 is a unit lattice with the smallest area among the unit lattices. The unit cell area 111 is a basic unit cell area. The touch panel shown in FIG. 1E includes two half X floating electrodes and two half Y floating electrodes in the basic unit cell region. That is, the touch panel shown in FIG. 1E has, in the basic unit lattice region, an X floating electrode equal in area to one X floating electrode FX and a Y floating electrode equal in area to one Y floating electrode FY. Including.

  The touch panel 100 is used as a mutual-capacitance projected capacitive touch panel. When the indicator touches the touch surface 105 of the touch panel 100, the mutual capacitance formed by the X electrode and the Y electrode facing the indicator (located below the indicator) decreases. As described later, this makes it possible to accurately detect the actual touch position when two places are touched simultaneously.

  While reducing the mutual capacitance formed by the X electrode and the Y electrode according to the touch of the indicator by the X floating electrode FX and Y floating electrode FY of this configuration, the thicknesses of the insulating layers 102 and 103 can be reduced. it can. Hereinafter, the operation of the X floating electrode FX and the Y floating electrode FY according to the present configuration will be described in comparison with a comparative example.

  FIG. 2A schematically shows a circuit model of the touch panel 100 including the X floating electrode FX and the Y floating electrode FY of this embodiment. The floating electrode is an electrode which is not given a specific potential and is in an electrically floating state. FIG. 2B shows a circuit model of a touch panel of a comparative example which does not include the X floating electrode FX and the Y floating electrode FY. In the following, the indicator is assumed to be a finger.

In the configuration example of the present embodiment shown in FIG. 2A, a capacitance C _{x -fx} exists between the X electrode X2 and the X floating electrode FX. There is a capacitance C _fx-f between the X floating electrode FX and the finger. A capacitance _Cy-fy exists between the Y electrode Y3 and the Y floating electrode FY. A capacitance C _fy-f exists between the Y floating electrode FY and the finger.

  The thickness D of the insulating layer 103 existing between (the upper surface of) the X floating electrode FX and (the upper surface of the Y floating electrode FY) and the finger is, for example, 10 μm. The thickness of the insulating layer 102 between (the lower surface of) the X floating electrode FX and (the lower surface of) the Y floating electrode FY, and (the upper surface of) the X electrode X2 and (the upper surface of) the Y electrode Y3 is also 10 μm, for example. .

In the comparative example shown in FIG. 2B, a capacitance C _{x -f} exists between the X electrode X2R and the finger. A capacitance C _y-f exists between the Y electrode Y3R and the finger. The thickness D of the insulating layer between the X electrode X2R and the Y electrode Y3R and the finger is, for example, 500 μm.

  In the configuration example of FIGS. 2A and 2B, for example, the X electrode is a drive electrode and the Y electrode is a reception electrode. In both configurations shown in FIGS. 2A and 2B, the touch of the indicator reduces the mutual capacitance formed by the X and Y electrodes.

  The insulating film thickness D of the configuration example of the present embodiment shown in FIG. 2A is much smaller than the insulating film thickness of the comparative example shown in FIG. 2B. When the insulating film thickness D in the comparative example is reduced, the capacitance between the X electrode and the Y electrode at the time of touch is increased. When the mutual capacitance between the X electrode and the Y electrode increases according to the touch, a ghost occurs in which the mutual capacitance increases at a position different from the actual touch position in the two-point touch. This problem of the comparative example will be described with reference to FIGS. 3A, 3B, 4.

3A and 3B schematically show equivalent circuits of the comparative example shown in FIG. 2B. FIG. 3A shows a circuit when the touch panel is not touched by a finger, and FIG. 3B shows a circuit when the touch panel is touched by a finger. Referring to FIG. 3A, electrodes e1 and e2 are an X electrode X2R and a Y electrode Y3R. There is a capacitance _Cnt between the electrodes e1 and e2. The drive voltage V _Tx is applied to the drive electrode e1. The signal current measured at the receiving electrode e2 is I _Rx .

Referring to FIG. 3B, the finger is represented by a circuit consisting of electrodes e3 and e4 and resistors R _f1 and R _f2 . The human body has a resistance Rb and the capacitance _{C b.} A capacitance C _f1 is present between the drive electrode e1 and the electrode e3 of the finger, and a capacitance C _f2 is present between the reception electrode e2 and the electrode e4 of the finger. The values of the capacitances C _f1 and C _f2 are, for example, the same.

FIG. 4 shows the calculation results of the relationship between the insulating film thickness D and the signal current I _Rx at the receiving electrode e2 in the models shown in FIG. 3A and FIG. 3B. In the calculation, assuming that the drive voltage V _Tx is a sine wave of 1 V and 100 kHz, the electrodes e1, e2, e3 and e4 are 3 mm square conductors, and the distance between the electrodes e1 and e2 on the circuit is 3 mm. ing. The body capacitance _{C b} is 100 pF, the body resistance Rb is 1.5kΩ And, the fingertip of the resistance _{R f1, R f2} assumes a 25Ω respectively.

  As shown in FIG. 4, when the insulating film thickness D between the electrode and the finger is less than 50 μm, the signal current to be detected increases due to touch, that is, the mutual capacitance between the X electrode and the Y electrode Will increase. In the comparative example which does not include the floating electrode shown in FIG. 2B, the insulating film thickness D needs to be 50 μm or more in order to detect two accurate touch positions.

Figure 3A, the model shown in 3B, the change in mutual capacitance by the touch (or Delta] Q) is, in either a negative or positive going, the impedance C _f and the impedance of the body between the finger and the electrode e1, e2 It turns out that the relationship can be done.

By increasing the insulating film thickness D, the capacitances C _f1 and C _f2 between the finger and the electrodes e1 and e2 can be reduced, and their respective impedances can be made larger than the impedance of the body. Considering an extreme example, when the impedance of the capacitances C _f1 and C _f2 is sufficiently larger than the impedance of the body, the impedance of the body can be regarded as zero. In this case, the potential at the midpoint of the finger resistances R _f1 and R _f2 is fixed to ground, and I _Rx does not flow. Therefore, the touch reduces the signal current I _Rx , that is, the mutual capacitance of the X electrode and the Y electrode decreases.

On the other hand, when the insulating film thickness D decreases, the capacitances C _f1 and C _f2 between the finger and the electrodes e1 and e2 increase, and these impedances become smaller than the impedance of the body. In extreme cases, the impedance of the body can be regarded as infinite. By inserting the electrodes e3 and e4 of the finger, the capacitance between the electrodes e1 and e2 increases, and the signal current I _Rx at the reception electrode e2 increases. Thus, the touch causes the signal current I _Rx to increase, that is, the mutual capacitance of the X electrode and the Y electrode increases.

Consider the cause of ghosting. Assuming that the impedance of the body is infinite, the potential of FINGER shown in FIG. 3B is 1/2 of the potential of V _Tx . Since V _Tx outputs an AC voltage or a pulse voltage or a step voltage, the potential of FINGER oscillates at half the amplitude of the voltage output from V _Tx . Since the impedance of the body is infinite, the potential of the hand being touched is also a potential close to 1/2 of the potential of V _Tx .

In this case, the potential of the finger other than the finger touching the electrode e1 is also a potential close to 1/2 of the potential of V _Tx . When two points are touched, the electric potential of the finger on the side not touching e1 is close to 1/2 of the electric potential of V _Tx , so the position facing the finger on the side not touching e1 The current flows in the receiving electrode at the point of the current, and the current I _Rx observed by the ammeter connected to the receiving electrode increases.

On the other hand, when the insulating film thickness D is large, it can be considered that the impedance of the body is zero, so the potentials of the finger touching and the finger not touching are zero. Therefore, no current flows in the receiving electrode at a position facing the non-finger finger touching e1, and the current I _Rx observed by the ammeter connected to the receiving electrode does not change.

  As described above, by increasing the impedance between the X and Y electrodes and the finger, the mutual capacitance due to the touch is reduced, and the touch position in the two-point touch can be accurately detected. In order to reduce the insulating film thickness D while maintaining the impedance between the X electrode and the Y electrode and the finger at a large value, the X electrode and the Y electrode may be reduced. Thereby, even if the insulating film thickness D is thin, the capacitance between the X electrode and the Y electrode and the finger can be reduced, and the impedance can be increased.

  However, if the X and Y electrodes are made smaller, the detection accuracy of the touch position may be reduced. The touch panel 100 of the present disclosure includes an X floating electrode FX and a Y floating electrode FY, and further, the X floating electrode area in the unit lattice region is larger than the X electrode area, and the Y floating electrode area is larger than the Y electrode area.

  Therefore, the change (sensitivity) of the signal current due to the touch increases, that is, the change (sensitivity) due to the touch of the mutual capacitance between the X electrode and the Y electrode increases, and the accurate touch position can be detected. In particular, in a configuration in which the insulating film thickness D between the X and Y electrodes and the finger is less than 50 μm, accurate touch position can be detected.

  5A and 5B show simulation results of the touch panel 100 of the present disclosure including floating electrodes. The X floating electrode and the Y floating electrode are squares each having a side of about 1200 μm, and the gap between the floating electrodes is about 10 μm. The pitch of each of the X electrode and the Y electrode is 1700 μm. The first insulating layer 102 is an acrylic layer, and its thickness is approximately 10 μm. The second insulating layer 103 is composed of a lower acrylic layer and an upper hard coat layer, and the acrylic layer is about 2 μm and the hard coat layer is about 10 μm. The drive signal has an amplitude of 10 V and a frequency of 100 kHz.

  FIG. 5A shows charge amount change at a touch point by one point touch, charge amount change at one actual touch point in a two point touch, and charge amount change at a ghost point in a two point touch. A ghost point is a point at which an X electrode of one actual touch point intersects with a Y electrode of the other actual touch point.

  As shown in FIG. 5A, one point touch reduces the amount of charge (signal current) at the touch point. Similarly, the two-point touch reduces the amount of charge (signal current) at each of the two touch points. The change in the amount of charge (signal current) is substantially similar between the one-point touch and the two-point touch. The charge amount (signal current) at the ghost point in the two-point touch is increasing. As shown to FIG. 5A, even if it thins a surface insulation film, the touch point of a two-point touch can be detected correctly by the touch panel of this indication containing a floating electrode.

  FIG. 5B shows the amount of charge Q at a touch point at a single point touch and at a ghost point when no touch is performed. FIG. 5B further shows the amount of change in capacitance ΔQ from the time of non-touch due to one-point touch. FIG. 5C shows similar simulation results of the comparative example shown in FIG. 2B.

  As shown in FIGS. 5B and 5C, the charge amount Q decreases with one point touch, and the charge amount at the ghost touch point increases. As can be understood by comparing FIGS. 5B and 5C, the ratio of the charge change amount ΔQ by the touch to the charge amount Q at no touch in the touch panel 100 of the present disclosure is the touch to the charge amount Q at no touch in the comparative example. Larger than the ratio of the charge change amount .DELTA.Q due to. The ratio occupied by ΔQ in the dynamic range of the circuit for measuring the signal current is increased, so that the SN ratio is improved.

  FIG. 5D shows experimental results of charge amount change in a structure (10 μm) in which the thickness D of the insulating layer is reduced in the comparative example shown in FIG. 2B. Specifically, the charge amount change at the touch point due to the one-point touch and the charge amount change at the ghost point in the two-point touch are shown. By one-point touch, the mutual capacitance of the touch position is increased, and the signal charge amount is increased. On the other hand, the signal charge amount at the position of the ghost also increases.

  Thus, when the insulating film thickness D in the comparative example is reduced, the capacitance between the X electrode and the Y electrode at the time of touch is increased. When the mutual capacitance between the X electrode and the Y electrode increases according to the touch, a ghost occurs in which the mutual capacitance increases at a position different from the actual touch position in the two-point touch. The amount of signal charge due to the actual touch and the ghost touch is comparable, and the actual touch and the ghost touch can not be identified using the threshold.

  Hereinafter, the configuration of the touch panel 100 of the present disclosure will be described using formulas. In the following, the configuration example shown in FIG. 2A is used. FIG. 6A schematically shows a circuit model when a finger is touching in the configuration example shown in FIG. 2A. FIG. 6B schematically shows an equivalent circuit of the model of FIG. 6A.

As shown in FIGS. 6A and 6B, the amplitude of the power supply V _Tx is V, and the angular frequency is ω. The combined capacitance between the X electrode X2 and the finger and the combined capacitance between the Y electrode Y3 and the finger are both denoted as C _f2 . These values are identical. Impedance Z ₁ and the Y electrode Y3 and the impedance Z ₁ of the finger and the X electrode X2 and the fingers are the same value, it is expressed by the following equation. Here, j represents an imaginary number.

As described with reference to FIGS. 3A, 3B, the finger and the body can be represented by a specific circuit. Here, the impedance of the finger resistances R _f1 and R _f2 is set to zero. Then, the impedance Z ₂ of the fingers and the body is represented by the following formula.

In the circuit shown in FIG. 6B, the combined impedance Z _t of the circuit viewed from the power supply V _Tx is expressed by the following equation.

Total current I _t of the circuit shown in FIG. 6B is expressed by the following equation.

Therefore, the signal current I _Rx is expressed by the following equation.

Here, the capacitance between the X electrode X2 and the Y electrode Y3 at the time of no touch is C _nt . The signal current _Int at the time of no touch is expressed by the following equation.

  The decrease in mutual capacity by touch means that the condition represented by the following equation is satisfied.

  That is, the following formula is established.

  From Equation 8, the following equation is established.

  Furthermore, the following equation is established from Equation 1 and Equation 2.

Here, according to the human body model of JIS, R _b = 1.5 kΩ and C _b = 100 pF. The driving frequency of a typical touch panel is 100 kHz, and the angular frequency ω is 2π × 100 × 10 ³ radians / second. Therefore, the impedance Z ₂ may be calculated as follows.

Thus, Z ₂ can be approximated to −j 16 kΩ, that is, R _b can be approximated to 0. Here, Z ₂ in equation (8) is replaced with Z ₃ as Z ₃ = 1 / jωC _b .

Rewriting Z ₁ and Z ₃ in Equation (12) into 1 / (jωC _f2 ) and 1 / jωC _b , respectively, the following equation is obtained.

  The following equation is obtained from equation (13).

In Equation ^{_{(14), (C nt -}} (C nt) 1/2 (C b + C nt) 1/2) is negative. Therefore, the following formula is obtained.

An example of the value of the variable described by the above equation will be described based on the embodiment. The outline of the touch panel in the present embodiment is the same as in FIGS. 1A and 1B. In this embodiment, when the touch panel is viewed in plan, the X floating electrode FX and the Y floating electrode FY have a square shape of 1180 μm on one side, and the gap between the adjacent X floating electrode FX and the Y floating electrode FY is 9 μm. . Both the pitch P _XE of the X electrode and the pitch P _{YE of the} Y electrode are 1680 μm.

  The X electrode has a shape in which rhombus parts are connected in a beaded connection via a band-like connection part, the rhombus part is a square with a side length of 230 μm, and the band width of the band-like connection part is 50 μm is there. The Y electrode has a shape in which a rhombus portion is connected in a beaded connection via a band-like connection portion, the rhombus portion is a square having a side length of 230 μm, and the band width of the band-like connection portion is 50 μm. is there.

  The first insulating layer 102 is an acrylic layer having a relative dielectric constant of 3 and has a thickness of about 10 μm. The second insulating layer 103 is composed of a lower acrylic layer and an upper hard coat layer. The acrylic layer has a dielectric constant of 3 and a thickness of 1.5 μm, and the hard coat layer has a dielectric constant of 5.3 and a thickness It is approximately 10 μm. The drive signal is at a frequency of 100 kHz.

In the case of this configuration example, referring to FIG. 2A, the value of the capacitance C _x −fx existing between the X electrode and one X floating electrode FX is 0.5 pF, and one X floating electrode FX and one finger The value of the capacitance C _{fx −f} existing between is 5.2 pF. The value of the capacitance C _y-fy existing between the Y electrode and one Y floating electrode FY is 0.5 pF, and the capacitance C _fy-f existing between one Y floating electrode FY and the finger is The value is 5.2 pF.

Referring to FIG. 6A, a capacitance C _f2 formed between a finger and an X electrode via one X floating electrode is a capacitance obtained by connecting a capacitance C _{x -fx} and a capacitance C _{fx -f} in series, The value is 0.456 pF. The capacitance formed between the finger and the Y electrode through one Y floating electrode has the same value of 0.456 pF and is denoted by the same symbol C _{f 2} . When the touch panel is not touched by a finger, a mutual capacitance is formed between the X electrode and the Y electrode via the X floating electrode and the Y floating electrode, but the cross portion of the X electrode and the Y electrode is located at one place. The mutual capacitance of is represented by C _nt and its value is 0.288 pF. This value can be determined by measurement or by means of a capacity simulator based on a three-dimensional shape.

Assuming that R _b = 1.5 kΩ and C _b = 100 pF according to the human body model and using the values described above, the value on the left side of Equation 8 is 1.31 × 10 ⁻⁹ Siemens, and the value on the right side of Equation 8 is 1. 81 × 10 ⁻⁷ Siemens, and the present embodiment satisfies Equation 8. Further, using R _b = 1.5 kΩ and C _b = 100 pF, Expression 8 is expressed as follows.

The value on the left side of Formula 10 is 4.28 × 10 ⁻³⁰ [F ² ], the value on the right side of Formula 10 is 8.32 × 10 ⁻²⁶ [F ² ], and this example satisfies Formula 10. Further, using R _b = 1.5 kΩ and C _b = 100 pF, Expression 10 is expressed as follows.

Further, the value of C _f2 of Formula 15 is 4.56 × 10 ⁻¹³ F, the value of the right side of Formula 15 is 5.66 × 10 ⁻¹² F, and this example satisfies Formula 15. Further, using R _b = 1.5 kΩ and C _b = 100 pF, Expression 15 is expressed as follows.

  The control method of the touch panel 100 will be described below. In the example described below, the touch panel 100 also functions as a tactile sense presentation panel. The tactile presentation panel imparts a feeling of texture to the finger by the electrostatic force oscillating at a predetermined frequency generated between the X electrode and the Y electrode.

  That is, the X electrode and the Y electrode are also used to give a sense of texture together with the detection of the touch point. When the user touches the touch surface 105, the control method of the touch panel 100 specifies the touch position on the touch surface 105 and gives the finger a feeling of texture. Hereinafter, the touch panel 100 which also functions as a tactile sense presentation panel is also referred to as a tactile sense presentation touch panel. The touch panel 100 may be used only for touch position detection.

  The touch panel 100 includes an X floating electrode and a Y floating electrode in addition to the X electrode and the Y electrode. As described above, in the unit lattice region, the X floating electrode area is larger than the X electrode area, and the Y floating electrode area is larger than the Y electrode area. Further, as described above, the touch panel 100 according to the present embodiment distinguishes the actual touch point and the ghost point in the two-point touch even if the insulating layer 102 covering the X floating electrode and the Y floating electrode is thinned, and is accurate Can identify two touch points.

  In the touch panel 100 according to the present embodiment, the distance between the X floating electrode and the Y floating electrode and the finger is short, and the area of the X floating electrode and the Y floating electrode facing the finger is larger than the X electrode and the Y electrode. A strong electrostatic force can be generated between the floating electrode and the Y floating electrode, and a large texture can be presented.

  FIG. 7 schematically shows a configuration example of the display device 10. The display device 10 is connected to the display panel 200 for displaying an image, the touch panel 100 disposed on the front side (user side) of the display panel 200, the display panel 200 and the touch panel 100, and a display device control unit for controlling them. And 300.

  The display panel 200 is, for example, a liquid crystal display panel or an OLED (Organic Light Emitting Diode) display panel. The display device control unit 300 causes the display panel 200 to display an image based on image data input from the outside. The display device control unit 300 controls the touch panel 100 to detect the touch position on the touch surface of the finger on the touch panel 100. The display device control unit 300 controls the touch panel 100 to present a texture feeling in the area corresponding to the area such as the button displayed on the display panel 200.

  The display device control unit 300 includes, for example, a processor, a memory, a storage, and an interface with the outside. These components are interconnected by internal wiring. The processor realizes a predetermined function by operating according to a program stored in the memory. The program executed by the processor and the data to be referred to are, for example, loaded from storage into memory. The display control unit 300 includes, in addition to or in place of the processor, a logic circuit that implements a predetermined function.

  FIG. 8 schematically shows an example of the logical configuration of the tactile sense touch panel device 15 included in the display device 10. As shown in FIG. The tactile sense presentation touch panel device 15 includes a tactile sense presentation touch panel control unit 350 that controls the tactile sense presentation touch panel 100 and the tactile sense presentation touch panel 100. The tactile sense presentation touch panel control unit 350 is a part of the display device control unit 300.

  The tactile sense touch panel control unit 350 includes a touch panel drive unit 351. The touch panel drive unit 351 detects the contact of an object on the touch surface 105 with X electrodes (X electrodes X0 to X4 in the example of FIG. 1A) and Y electrodes (Y electrodes Y0 to Y4 in the example of FIG. 1A). Control the operation. The touch panel drive unit 351 is a circuit for realizing the function of a touch panel that detects a touch of a pointer on the touch surface 105 using an X electrode and a Y electrode.

  The tactile sense presentation touch panel control unit 350 operates the X electrode drive unit 352 for controlling the operation of the X electrode so as to cause the touch surface 105 to present a texture feeling, and the operation of the Y electrode to present the texture feeling on the touch surface 105. And Y electrode driver 353 for control. The X electrode drive unit 352 and the Y electrode drive unit 353 are circuits for presenting texture feeling on the touch surface 105 using the X electrode and the Y electrode.

  The tactile sense presentation touch panel control unit 350 includes a switch (SW) 354 connected to a plurality of X electrodes and a switch 355 connected to a plurality of Y electrodes. The switch 354 is configured to connect a part of X electrodes to the touch panel drive unit 351, connect other X electrodes to the X electrode drive unit 352, and switch the connection of each X electrode from one to the other. ing. The switch 355 is configured to connect a part of the Y electrodes to the touch panel drive unit 351, connect the other Y electrodes to the Y electrode drive unit 353, and switch the connection of each Y electrode from one to the other. ing.

  The tactile sense touch panel control unit 350 includes a main control unit 356. The main control unit 356 is connected to the touch panel drive unit 351, the X electrode drive unit 352, the Y electrode drive unit 353, the switch 354, and the switch 355. The main control unit 356 receives a control signal from the outside of the tactile sense touch panel control unit 350, and controls other components in the tactile sense touch panel control unit 350.

  The tactile sense presentation touch panel device 15 presents a feeling of texture on the touch surface 105 by the operations of the X electrode drive unit 352 and the Y electrode drive unit 353. When the user brings a finger into contact with the touch surface 105, this finger is equivalent to an electrode connected to the ground with the X electrode or the Y electrode facing the insulator. When a voltage is applied to the X electrode or the Y electrode, an electrostatic attraction (electrostatic force) is generated between the X electrode or the Y electrode and the finger.

  When an alternating voltage is applied, the electrostatic force periodically changes. Due to the change in electrostatic force, the frictional force between the touch surface 105 and the finger changes periodically. When the user traces the touch surface 105 with a finger, the frictional force felt by the finger changes periodically, and the user perceives a feeling of texture. A touch is perceived if the frequency of the alternating voltage is greater than 5 Hz and less than 500 Hz, and no touch is perceived if the frequency is not in this range.

  When an alternating voltage of the first frequency f1 is applied to the X electrode and an alternating voltage of the second frequency f2 is applied to the Y electrode, the electrostatic force changes at the first frequency f1 and the second frequency f2. Furthermore, a beat occurs in which the electrostatic force changes at the frequency of the difference between the first frequency f1 and the second frequency f2. The texture feeling due to the beat is perceived when the beat frequency exceeds 10 Hz and is less than 1000 Hz, and the texture feeling due to the beat is not perceived when the beat frequency is not within this range.

  In one example, the first frequency f1 is set so that the first frequency f1 and the second frequency f2 are both 500 Hz or more, and the absolute value of the difference between the first frequency f1 and the second frequency f2 exceeds 10 Hz and is less than 1000 Hz. And a second frequency f2 is determined. For example, the first frequency f1 = 1000 Hz and the second frequency f2 = 1240 Hz.

  Under control of the main control unit 356, the X electrode drive unit 352 applies a first AC voltage to some of the X electrodes connected to the X electrode drive unit 352, and connects the other X electrodes to the ground. Do. Of the Y electrodes connected to the Y electrode drive unit 353, the Y electrode drive unit 353 applies a second AC voltage to some of the Y electrodes under control of the main control unit 356, and sets the other Y electrodes 14 to ground. Connecting.

  For example, the touch panel 100 includes five X electrodes X0 to X4 and six Y electrodes Y0 to Y5, the first AC voltage is applied to the X electrode X1, the second AC voltage is applied to the Y electrode Y1, and It is assumed that the electrodes X2 to X4 and the Y electrodes Y2 to Y5 are connected to the ground. At this time, a beat of 240 Hz occurs at a portion where the X electrode X1 and the Y electrode Y1 of the touch surface 105 intersect, and the user can perceive a texture feeling with a finger. At the intersection of the X electrode X1 and the Y electrodes Y2 to Y5, although the electrostatic force changes at 1000 Hz, no texture is perceived.

  In the portion where the Y electrode Y1 and the X electrodes X2 to X4 intersect, although the electrostatic force changes at 1240 Hz, no texture is perceived. In the other part, the electrostatic force does not change, and no sense of texture is perceived. In this manner, the touch sense touch panel device 15 can present a feeling of texture at any position on the touch surface 105. The X electrode driving unit 352 and the Y electrode driving unit 353 may connect the X electrode and the Y electrode to a predetermined DC power supply instead of the ground.

  The touch panel drive unit 351 sequentially supplies drive signals to the X electrodes, and measures signal current of the Y electrodes sequentially or simultaneously while supplying drive signals to the X electrodes. The drive signal may be given in a group unit of a plurality of continuous X electrodes, and the signal current may be measured in a group unit of a plurality of continuous Y electrodes.

  In the portion where the X electrode and the Y electrode intersect, a capacitance is generated between the X electrode and the Y electrode. When the touch panel drive unit 351 inputs an alternating current signal to one X electrode, an alternating current flows between the X electrode and the selected Y electrode, and the touch panel drive unit 351 detects the alternating current.

  When the user's finger comes in contact with a portion on the touch surface 105 facing the portion where the X electrode and the Y electrode intersect, a capacitance is generated between the X electrode or the Y electrode and the finger, X The capacitance between the electrode and the Y electrode is reduced. Along with this, the signal current (AC current) of the Y electrode decreases.

  The main control unit 356 specifies, to the touch panel drive unit 351, an X electrode to which a drive signal is to be supplied and a Y electrode to measure a signal current. The main control unit 356 compares the signal current measured by the touch panel drive unit 351 with a predetermined threshold value, and determines that the capacitance between the X electrode and the Y electrode connected to the touch panel drive unit 351 is reduced. To detect.

  The main control unit 356 specifies the position where the user's finger is in contact by specifying the X electrode and the Y electrode connected to the touch panel drive unit 351 when the capacitance decreases. The contact position is a position on the touch surface 105 facing a portion where the X electrode and the Y electrode connected to the touch panel drive unit 351 intersect.

  Next, processing in which the tactile sense presentation touch panel device 15 makes detection of the touch point and presentation of the feeling of texture compatible with each other will be described. The main control unit 356 controls which of the touch panel drive unit 351 and the X electrode drive unit 352 the switch 354 connects the X electrode to. Similarly, the main control unit 356 controls which of the touch panel drive unit 351 and the Y electrode drive unit 353 the switch 355 connects to each of the Y electrodes.

  The main control unit 356 causes the switch 354 to connect a part of the X electrodes to the touch panel drive unit 351, and causes the other X electrodes to be connected to the X electrode drive unit 352. Further, the main control unit 356 causes the switch 354 to sequentially change the X electrode connected to the touch panel drive unit 351.

  When changing the X electrode connected to the touch panel drive unit 351, the switch 354 connects the X electrode which has been connected to the touch panel drive unit 351 to the X electrode drive unit 352, and the X electrode drive unit 352 The touch panel drive unit 351 is connected to a part of the X electrodes of the plurality of X electrodes 13 connected to the touch panel drive unit 351.

  For example, X electrode X1 is connected to touch panel drive unit 351 from the state where X electrode X0 is connected to touch panel drive unit 351 and X electrodes X1 to X4 are connected to X electrode drive unit 352 among X electrodes X0 to X4. And the X electrodes X0 and X2 to X4 are connected to the X electrode driving unit 352. Similarly, the X electrodes connected to the touch panel drive unit 351 are sequentially changed.

  The main control unit 356 causes the switch 355 to connect some of the Y electrodes to the touch panel drive unit 351, connect the other Y electrodes to the Y electrode drive unit 353, and sequentially connect the Y electrodes connected to the touch panel drive unit 351. Change to When changing the Y electrode connected to the touch panel drive unit 351, the switch 355 connects the Y electrode connected to the touch panel drive unit 351 to this time to the Y electrode drive unit 353, and the Y electrode drive unit 353 A part of Y electrodes of the plurality of Y electrodes connected to the touch panel driving unit 351 is connected to the touch panel drive unit 351.

  For example, from among the Y electrodes Y0 to Y5, the Y electrode Y0 is connected to the touch panel drive unit 351, and the Y electrodes Y1 to Y5 are connected to the Y electrode drive unit 353, the Y electrode Y1 is connected to the touch panel drive unit 351 And the Y electrodes Y0 and Y2 to Y5 are connected to the Y electrode drive unit 353, and similarly, the Y electrodes 14 connected to the touch panel drive unit 351 are sequentially changed.

  The main control unit 356 controls the X electrode drive unit 352 to apply the first alternating voltage to the X electrode corresponding to the area where the texture is to be presented, and connects the other X electrodes to the ground. The main control unit 356 controls the Y electrode drive unit 353 to apply the second AC voltage to the Y electrode corresponding to the area where the texture is to be presented, and connects the other Y electrodes to the ground.

  The main control unit 356 sequentially connects the X electrode and the Y electrode to the touch panel drive unit 351, and sequentially controls the touch surface to detect a touch on the touch surface 105. A scan of the touch surface 105 is performed to detect touch points. After scanning of the entire touch surface 105 is completed, the main control unit 356 repeats the process of sequentially connecting the X electrode 13 and the Y electrode 14 to the touch panel drive unit 351. As a result, the scanning is repeated, and when the user touches an arbitrary position on the touch surface 105, the touch position is detected.

  During a period other than the period connected to the touch panel drive unit 351, a specific AC voltage is applied to one or a plurality of specific X electrodes, and a second AC voltage is applied to a specific one or a plurality of continuous Y electrodes. Given. The other X and Y electrodes are connected to ground. As a result, a sense of texture is presented on a specific target area in the touch surface 105.

  As described above, as a result of controlling the X electrode and the Y electrode, the touch surface 105 is partially used for touch detection, and the other portion is used for presenting a sense of texture and used for touch detection. The position of the portion to be moved is sequentially changed. Each portion on the touch surface 105 is used for touch detection at a specific timing, and is used for texture presentation in other periods.

  As mentioned above, although embodiment of this indication was described, this indication is not limited to said embodiment. Those skilled in the art can easily change, add, or convert the elements of the above-described embodiment within the scope of the present disclosure. It is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment.

Reference Signs List 10 display device, 15 tactile sense touch panel device, 100 touch panel, 101 support substrate, 102 insulating layer, 103 insulating layer, 200 display panel, 300 display device control unit, 350 tactile sense touch panel control unit, 351 touch panel drive unit, 352 X electrode Drive unit, 353 Y electrode drive unit, 354 switch, 355 switch, 356 main control unit, X0-X4 X electrode, Y0-Y4 Y electrode, FX X floating electrode, FY Y floating electrode

Claims (11)

A supporting substrate,
A plurality of X electrodes arranged on the support substrate;
A plurality of Y electrodes arranged on the support substrate so as to intersect the plurality of X electrodes and insulated from the plurality of X electrodes;
A plurality of X floating electrodes stacked via a first insulating layer at positions facing the plurality of X electrodes;
A plurality of Y floating electrodes stacked via the first insulating layer at positions facing the plurality of Y electrodes;
A second insulating layer covering the plurality of X floating electrodes and the plurality of Y floating electrodes;
Including
In the unit lattice region of the lattice formed by the plurality of X electrodes and the plurality of Y electrodes, the X electrode area is smaller than the X floating electrode area, and the Y electrode area is smaller than the Y floating electrode area,
When the surface of the second insulating layer is touched by the indicator, the mutual capacitance formed by the X electrode and the Y electrode decreases.
Touch panel. It is a touch panel according to claim 1, and
The plurality of X floating electrodes are disposed at positions facing each of the plurality of X electrodes, and are configured of a plurality of island-like electrodes separated from other electrodes,
The plurality of Y floating electrodes are disposed at positions facing each of the plurality of Y electrodes, and are configured of a plurality of island-like electrodes separated from other electrodes.
Touch panel. It is a touch panel according to claim 1, and
The thickness from the upper surface of the plurality of X electrodes to the surface of the second insulating layer is 50 μm or less,
The thickness from the upper surface of the plurality of Y electrodes to the surface of the second insulating layer is 50 μm or less.
Touch panel. It is a touch panel according to claim 1, and
The indicator is a finger or a conductor electrically coupled to the finger,
C _f2 is a series of a capacitance formed by one X floating electrode and the indicator, and a capacitance formed by the X electrode facing the one X floating electrode and the one X floating electrode A combined capacitance connected, an electrostatic capacitance formed by one Y floating electrode and the indicator, and an electrostatic discharge formed by the one Y floating electrode and a Y electrode facing the one Y floating electrode It is a combined capacitance of series connection of capacitance and
_Cnt is a mutual capacitance formed by the one X electrode and the one Y electrode when the surface of the second insulating layer is not touched by the indicator,
C _b is a body volume of the human body having the finger,
The following conditions are met,

Touch panel. It is a touch panel according to claim 1, and
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 texture feeling to a finger that is the pointer.
Touch panel. A touch panel according to claim 1;
A control unit that controls the touch panel;
The control unit
A touch position on the touch panel is specified by measuring a change in mutual capacitance between the plurality of X electrodes and the plurality of Y electrodes by a drive signal of an angular frequency ω,
The indicator is a finger or a conductor electrically coupled to the finger,
_Cnt is a mutual capacitance formed by the one X electrode and the one Y electrode when the surface of the second insulating layer is not touched by the indicator,
Z ₁ is a capacitance formed by one X floating electrode and the indicator, and a capacitance formed by an X electrode facing the one X floating electrode and the one X floating electrode A complex synthetic impedance connected in series, a capacitance formed by one Y floating electrode and the indicator, and a Y electrode facing the one Y floating electrode and the one Y floating electrode Complex composite impedance in which capacitance is connected in series,
Z ₂ is the complex impedance of the body of the human body with said finger,
j is an imaginary number,
The following conditions are met,

Touch panel device. A touch panel according to claim 1;
A control unit that controls the touch panel;
The control unit
A touch position on the touch panel is specified by measuring a change in mutual capacitance between the plurality of X electrodes and the plurality of Y electrodes by a drive signal of an angular frequency ω,
The indicator is a finger or a conductor electrically coupled to the finger,
C _f2 is a series of a capacitance formed by one X floating electrode and the indicator, and a capacitance formed by the X electrode facing the one X floating electrode and the one X floating electrode A combined capacitance connected, an electrostatic capacitance formed by one Y floating electrode and the indicator, and an electrostatic discharge formed by the one Y floating electrode and a Y electrode facing the one Y floating electrode It is a combined capacitance of series connection of capacitance and
_Cnt is a mutual capacitance formed by the one X electrode and the one Y electrode when the surface of the second insulating layer is not touched by the indicator,
C _b is a body volume of the human body having the finger,
R _b is a body resistance of the human body having the finger,
The following conditions are met,

Touch panel device. A touch panel according to claim 1;
A control unit that controls the touch panel;
The control unit
A touch position on the touch panel is specified by measuring a change in mutual capacitance between the plurality of X electrodes and the plurality of Y electrodes by a drive signal,
A texture is presented by giving drive signals of different frequencies having a predetermined frequency difference to X electrodes and Y electrodes different from each other in X and Y electrodes whose mutual capacitances are measured.
Touch panel device. It is a touch panel according to claim 1, and
The indicator is a finger or a conductor electrically coupled to the finger,
C _f2 is a series of a capacitance formed by one X floating electrode and the indicator, and a capacitance formed by the X electrode facing the one X floating electrode and the one X floating electrode A combined capacitance connected, an electrostatic capacitance formed by one Y floating electrode and the indicator, and an electrostatic discharge formed by the one Y floating electrode and a Y electrode facing the one Y floating electrode It is a combined capacitance of series connection of capacitance and
_Cnt is a mutual capacitance formed by the one X electrode and the one Y electrode when the surface of the second insulating layer is not touched by the indicator,
The following conditions are met,

Touch panel. A touch panel according to claim 1;
A control unit that controls the touch panel;
The control unit
A touch position on the touch panel is specified by measuring a change in mutual capacitance between the plurality of X electrodes and the plurality of Y electrodes by a drive signal of an angular frequency ω,
The indicator is a finger or a conductor electrically coupled to the finger,
_Cnt is a mutual capacitance formed by the one X electrode and the one Y electrode when the surface of the second insulating layer is not touched by the indicator,
Z ₁ is a capacitance formed by one X floating electrode and the indicator, and a capacitance formed by an X electrode facing the one X floating electrode and the one X floating electrode A complex synthetic impedance connected in series, a capacitance formed by one Y floating electrode and the indicator, and a Y electrode facing the one Y floating electrode and the one Y floating electrode Complex composite impedance in which capacitance is connected in series,
j is an imaginary number,
The following conditions are met,

Touch panel device. A touch panel according to claim 1;
A control unit that controls the touch panel;
The control unit
A touch position on the touch panel is specified by measuring a change in mutual capacitance between the plurality of X electrodes and the plurality of Y electrodes by a drive signal of an angular frequency ω,
The indicator is a finger or a conductor electrically coupled to the finger,
C _f2 is a series of a capacitance formed by one X floating electrode and the indicator, and a capacitance formed by the X electrode facing the one X floating electrode and the one X floating electrode A combined capacitance connected, an electrostatic capacitance formed by one Y floating electrode and the indicator, and an electrostatic discharge formed by the one Y floating electrode and a Y electrode facing the one Y floating electrode It is a combined capacitance of series connection of capacitance and
_Cnt is a mutual capacitance formed by the one X electrode and the one Y electrode when the surface of the second insulating layer is not touched by the indicator,
The following conditions are met,

Touch panel device.

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