WO2013069290A1 - Dispositif de panneau tactile - Google Patents

Dispositif de panneau tactile Download PDF

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Publication number
WO2013069290A1
WO2013069290A1 PCT/JP2012/007182 JP2012007182W WO2013069290A1 WO 2013069290 A1 WO2013069290 A1 WO 2013069290A1 JP 2012007182 W JP2012007182 W JP 2012007182W WO 2013069290 A1 WO2013069290 A1 WO 2013069290A1
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WIPO (PCT)
Prior art keywords
electrode
electrodes
touch panel
signal
changeover switch
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PCT/JP2012/007182
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English (en)
Japanese (ja)
Inventor
基之 岳山
英則 北村
福島　奨
信次 藤川
Original Assignee
パナソニック株式会社
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Priority to JP2013510388A priority Critical patent/JP5327408B1/ja
Publication of WO2013069290A1 publication Critical patent/WO2013069290A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Definitions

  • the present invention relates to a capacitive touch panel device.
  • touch panel devices for inputting necessary information by touching an image displayed on a display with a mobile terminal, a personal computer, a bank ATM (Automatic Teller Machine) terminal, or the like have become widespread.
  • the touch panel device needs to detect the position of a detection target object such as a finger touched on the surface with high accuracy and high sensitivity.
  • Capacitive touch panel devices are superior in terms of their lifetime, responsiveness, and detection accuracy compared to resistive thin film methods, and are widely used.
  • the capacitive touch panel device monitors a change in capacitance when a detection target object touches the surface of the touch panel device, and detects a touch position.
  • Patent Document 1 discloses a touch panel device in which a plurality of detection electrodes of a touch panel are electrically coupled, and the amount of change in capacitance to be detected is increased to increase detection sensitivity.
  • the position detection accuracy decreases when a plurality of detection electrodes are electrically coupled.
  • the touch panel device is electrically connected in series between a touch panel having first and second electrodes, an AC signal source for inputting an AC signal to the first electrode, and the AC signal source and the first electrode. And a detection circuit for detecting a change in capacitance between the first electrode and the second electrode when a detection target touches the touch panel based on a change in a signal output from at least the second electrode.
  • This touch panel device can increase detection sensitivity with a simple configuration.
  • FIG. 1 is a schematic cross-sectional view of a touch panel of a touch panel device according to Embodiment 1.
  • FIG. FIG. 2A is a schematic cross-sectional view illustrating the operating principle of a mutual capacitance type touch panel device.
  • 2B is an equivalent circuit diagram of the touch panel device shown in FIG. 2A.
  • 2C is an equivalent circuit diagram of the touch panel device shown in FIG. 2A.
  • FIG. 2D is a diagram showing a voltage waveform of electrodes of the touch panel device shown in FIG. 2A.
  • FIG. 2E is a diagram showing a voltage waveform of electrodes of the touch panel device shown in FIG. 2A.
  • FIG. 3 is a configuration diagram of the touch panel device according to the first embodiment.
  • FIG. 3 is a configuration diagram of the touch panel device according to the first embodiment.
  • FIG. 4 is a timing chart showing a switching control signal of the touch panel device in the first embodiment.
  • FIG. 5A is a configuration diagram of the touch panel device according to Embodiment 1.
  • FIG. 5B is an equivalent circuit diagram of the touch panel device shown in FIG. 5A.
  • FIG. 6A is a schematic cross-sectional view of a touch panel device of a comparative example. 6B is a schematic cross-sectional view of the touch panel device according to Embodiment 1.
  • FIG. FIG. 7A is a configuration diagram of another touch panel device according to the first exemplary embodiment.
  • FIG. 7B is a configuration diagram of still another touch panel device according to Embodiment 1.
  • FIG. 8 is a configuration diagram of still another touch panel device according to the first exemplary embodiment.
  • FIG. 8 is a configuration diagram of still another touch panel device according to the first exemplary embodiment.
  • FIG. 9 is a configuration diagram of the touch panel device according to the second embodiment.
  • FIG. 10 is a configuration diagram of Modification 1 of the touch panel device according to the second embodiment.
  • FIG. 11 is a configuration diagram of a second modification of the touch panel device according to the second embodiment.
  • FIG. 12 is a configuration diagram of a third modification of the touch panel device according to the second embodiment.
  • FIG. 13 is a configuration diagram of Modification 4 of the touch panel device according to Embodiment 2.
  • FIG. 14 is a configuration diagram of Modification Example 5 of the touch panel device according to Embodiment 2.
  • FIG. 15A is a configuration diagram of Modification 6 of the touch panel device according to Embodiment 2.
  • FIG. 15B is a configuration diagram of Modification Example 7 of the touch panel device according to Embodiment 2.
  • FIG. 15A is a configuration diagram of Modification 6 of the touch panel device according to Embodiment 2.
  • FIG. 15B is a configuration diagram of Modification Example 7 of the touch panel device according to
  • FIG. 16 is a configuration diagram of the touch panel device according to the third embodiment.
  • FIG. 17 is a block diagram of the touch panel device shown in FIG.
  • FIG. 18 is a configuration diagram of another touch panel device according to the third embodiment.
  • FIG. 19 is a block diagram of the touch panel device shown in FIG.
  • FIG. 20A is a schematic cross-sectional view of the touch panel device according to Embodiment 4.
  • FIG. 20B is a diagram showing a waveform of a signal of the touch panel device in the fourth exemplary embodiment.
  • FIG. 20C is a schematic cross-sectional view of another touch panel device according to Embodiment 4.
  • FIG. 21 is a configuration diagram of the touch panel device according to the fifth embodiment.
  • FIG. 22 is a schematic cross-sectional view of the touch panel device according to the sixth embodiment.
  • FIG. 23A is a schematic cross-sectional view illustrating the operating principle of a self-capacitance touch panel device.
  • FIG. 23B is an equivalent circuit diagram of the touch panel device shown in FIG. 2A.
  • FIG. 23C is a diagram showing a waveform of an electrode voltage of the touch panel device shown in FIG. 2A.
  • FIG. 23D is a diagram showing a waveform of an electrode voltage of the touch panel device shown in FIG. 2A.
  • FIG. 24A is a configuration diagram of the touch panel device according to Embodiment 6.
  • FIG. 24B is a configuration diagram of another touch panel device according to Embodiment 6.
  • FIG. 25A is a schematic cross-sectional view of the touch panel device according to Embodiment 7.
  • FIG. 24A is a schematic cross-sectional view of the touch panel device according to Embodiment 7.
  • FIG. 25B is a schematic cross-sectional view of another touch panel device according to Embodiment 7.
  • FIG. 26 is a configuration diagram of a touch panel of the touch panel device according to the eighth embodiment.
  • FIG. 27 is a configuration diagram of a touch panel of another touch panel device according to the eighth embodiment.
  • FIG. 28 is a configuration diagram of the touch panel device according to the ninth embodiment.
  • FIG. 29A is a diagram showing frequency characteristics of signals propagating through the electrodes of the touch panel device according to Embodiments 1 to 5.
  • FIG. 29B is a diagram illustrating frequency characteristics of signals propagating through the electrodes of the touch panel device of the comparative example.
  • FIG. 30A is a diagram showing a frequency characteristic of a signal propagating through the electrode of the touch panel device in the first to fifth embodiments.
  • FIG. 30B is a diagram illustrating frequency characteristics of signals propagating through the electrodes of the touch panel device of the comparative example.
  • FIG. 31 is a configuration diagram of the touch panel device according to the tenth embodiment.
  • FIG. 32 is a configuration diagram of another touch panel device according to the tenth embodiment.
  • FIG. 33 is a block diagram of still another touch panel device according to the tenth embodiment.
  • FIG. 34 is a configuration diagram of still another touch panel device according to the tenth embodiment.
  • FIG. 35 is a configuration diagram of still another touch panel device according to the tenth embodiment.
  • FIG. 36 is a block diagram of still another touch panel device according to the tenth embodiment.
  • FIG. 37 is a block diagram of still another touch panel device according to the tenth embodiment.
  • FIG. 38 is a block diagram of still another touch panel device according to the tenth embodiment.
  • the capacitive touch panel device detects a change in capacitance of transparent electrodes facing each other in a lattice shape with an insulating layer such as a dielectric interposed therebetween.
  • Capacitive touch panel devices include a self-capacitance type that detects changes in the capacitance of the electrode itself (capacitance between the electrode and ground) and a mutual capacitance type that detects a change in capacitance between opposing electrodes. There are two types. The touch panel device according to the embodiment described below can be applied to both self-capacitance type and mutual capacitance type touch panel devices.
  • FIG. 1 is a schematic cross-sectional view of a touch panel 100 mounted on the touch panel device 1 according to the first embodiment.
  • the touch panel device 1 is a mutual capacitance type touch panel device.
  • the touch panel 100 includes a liquid crystal display element (hereinafter referred to as LCD) 107 that is an image display element, an electrode layer 108, a glass layer 105, a shield layer 106, and a protective layer 101.
  • the electrode layer 108, the glass layer 105, the shield layer 106, and the protective layer 101 are transparent.
  • the LCD 107 and the electrode layer 108 are disposed to face each other with the glass layer 105 and the shield layer 106 interposed therebetween.
  • the electrode layer 108 includes a drive electrode 104, a glass layer 103 that is an insulating layer, and a detection electrode 102 that faces the drive electrode 104 with the glass layer 103 interposed therebetween.
  • the drive electrode 104 and the detection electrode 102 are formed by arranging transparent electrodes such as ITO (Indium Tin Oxide) in a grid pattern in directions orthogonal to each other.
  • An AC signal is input to the drive electrode 104 and output from the detection electrode 102. By detecting this AC signal, a change in capacitance between the drive electrode 104 and the detection electrode 102 is detected.
  • the transparent shield layer 106 is connected to the ground, and noise generated when driving the LCD 107 jumps into the drive electrode 104 and the detection electrode 102 to prevent the touch panel 100 from malfunctioning.
  • An LCD substrate on which the LCD 107 is mounted is also connected to the ground.
  • the shield layer 106 and the LCD substrate are collectively referred to as a panel ground.
  • the shield layer 106 is not an essential component for the touch panel device in the embodiment.
  • FIG. 2A is a schematic cross-sectional view for explaining the operation principle of the mutual capacitance type touch panel device 1 and is an enlarged view of the electrode layer 108.
  • FIG. 2B is an equivalent circuit diagram of the touch panel device 1 in a state where the detection target F such as an operator's finger is not touching the touch panel 100.
  • FIG. 2C is an equivalent circuit diagram of the touch panel device 1 in a state where the detection target F touches the touch panel 100.
  • FIG. 2D shows a waveform of the drive voltage Vs that is an AC signal applied to the drive electrode 104.
  • FIG. 2E shows a waveform of a detection voltage Vd that is an AC signal detected from the detection electrode 102.
  • the stray capacitance between the detection electrode 102 and the ground and the drive electrode 104 and the ground are made easy to understand the operation principle of the mutual capacitance type touch panel device 1.
  • the stray capacitance between them is not taken into consideration.
  • a coupling capacitance Ce exists between the drive electrode 104 and the detection electrode 102 at the intersection where the drive electrode 104 and the detection electrode 102 intersect via the insulating layer 103.
  • the drive voltage Vs of the AC signal is applied to the drive electrode 104, the AC signal current i1 flows to the detection electrode 102 through the coupling capacitor Ce and is converted to the detection voltage Vd by the resistor R.
  • the capacitance Cf is connected between the detection object F and the detection electrode 102 in parallel with the coupling capacitor Ce. At this time, a part of the charge accumulated in the coupling capacitor Ce escapes to the ground via the capacitance Cf. Therefore, as shown in FIG. 2C, a part of the AC signal current i1 (current i3) flows through the capacitance Cf, and the current i2 flowing through the resistor R is smaller than the current i1. Therefore, the detection voltage Vd2 generated in the resistor R is a value smaller than the detection voltage Vd1 when the detection target F is not touched.
  • a predetermined threshold voltage Vth is set between the detection voltage Vd1 and the detection voltage Vd2, and the detection circuit 114, which will be described later, compares the detection voltage Vd with the threshold voltage Vth. If the detection voltage Vd is higher than the threshold voltage Vth, it is determined that the detection target F is not touched. Conversely, if the detection voltage Vd is lower than the threshold voltage Vth, the detection target F is touched. It is determined that
  • FIG. 3 is a configuration diagram of the touch panel device 1 according to the first embodiment.
  • the touch panel device 1 includes a touch panel 100, an AC signal source 110, a drive electrode changeover switch 112, a detection electrode changeover switch 113, a detection circuit 114, and a control circuit 115.
  • An inductance element 111 as a matching element is connected in series between the AC signal source 110 and the drive electrode changeover switch 112.
  • the longitudinal direction of the touch panel 100 is defined as the X axis, and the direction orthogonal to the X axis is defined as the Y axis.
  • the touch panel 100 includes a plurality of drive electrodes 104 (first electrodes) arranged in a substantially equal interval in the X-axis direction (first direction) and extending in the Y-axis direction (second direction), and the Y-axis direction.
  • first electrodes arranged in a substantially equal interval in the X-axis direction (first direction) and extending in the Y-axis direction (second direction), and the Y-axis direction.
  • detection electrodes 102 second electrodes
  • the drive electrode 104 is composed of six drive electrodes X1 to X6, and the detection electrode 102 is composed of six detection electrodes Y1 to Y6.
  • the drive electrodes X1 to X6 and the detection electrodes Y1 to Y6 are arranged in a lattice pattern so as to be orthogonal to each other.
  • the AC signal source 110 generates an AC signal having a frequency of about 1.0 MHz to 1.5 MHz, for example.
  • the drive electrode changeover switch 112 (first electrode changeover switch) includes switches TSW1 to TSW6 that are electrically connected to the drive electrodes X1 to X6, respectively.
  • the drive electrode Xm (electrically connected to the inductance element 111) m is an integer satisfying 1 ⁇ m ⁇ 6), and other drive electrodes not selected are connected to the ground.
  • the drive electrode changeover switch 112 has one terminal electrically connected to the drive electrodes X1 to X6 and the other terminal electrically connected to the inductance element 111.
  • the drive electrode selector switch 112 switches the connection state between the drive electrodes X1 to X6 and the inductance element 111 between an open state and a short circuit state. The drive electrode in the open state is connected to the ground.
  • the drive electrodes X1, X2, X4, X5, and X6 that are not selected are connected to the ground.
  • the AC signal source 110 inputs an AC signal to the drive electrode X3 selected by the drive electrode changeover switch 112 via the inductance element 111.
  • the drive electrodes X1, X2, X4, X5, and X6 that are in the open state are connected to the ground.
  • the detection electrode changeover switch 113 (second electrode changeover switch) includes switches RSW1 to RSW6 that are electrically connected to the detection electrodes Y1 to Y6, respectively, and is a detection electrode Yn (electrically connected to the detection circuit 114).
  • n is an integer satisfying 1 ⁇ n ⁇ 6), and other detection electrodes not selected are connected to the ground. That is, one terminal of the detection electrode selector switch 113 is electrically connected to the detection electrodes Y1 to Y6, and the other terminal is electrically connected to the input side of the detection circuit 114. Then, the connection state between the detection electrodes Y1 to Y6 and the detection circuit 114 is switched between an open state and a short circuit state. The detection electrode that has been opened is connected to the ground.
  • the detection electrodes Y1, Y2, Y4, Y5, and Y6 that are not selected are connected to the ground.
  • the detection electrodes Y1, Y2, Y4, Y5, and Y6 in the open state are connected to the ground.
  • the control circuit 115 outputs a switching control signal SEL1 to the drive electrode switch 112, and controls switching of the switches TSW1 to TSW6. Similarly, the control circuit 115 outputs a switching control signal SEL2 to the detection electrode switch 113 to control switching of the switches RSW1 to RSW6.
  • the detection circuit 114 generates a detection voltage Vd from the AC signal output from the detection electrode Yn (1 ⁇ n ⁇ 6) selected by the detection electrode switch 113 (short-circuited with the detection circuit 114). By comparing with the voltage Vth, it is detected whether or not the detection object F has touched the touch panel 100.
  • the electrode that is short-circuited between the AC signal source, the inductance element, the detection circuit, and the like by the drive electrode changeover switch and the detection electrode changeover switch is referred to as a “selected electrode or selection electrode”,
  • An electrode that is in an open state may be referred to as an “unselected electrode or non-selected electrode”.
  • FIG. 4 is a timing chart showing the switching timing of the switching control signal SEL1 for controlling the switches TSW1 to TSW6 of the drive electrode switching switch 112 and the switching control signal SEL2 for controlling the switches RSW1 to RSW6 of the detection electrode switching switch 113. is there.
  • the drive electrode changeover switch 112 scans the drive electrodes X1 to X6 connected to the AC signal source 110 so as to be sequentially selected at a constant time interval Td.
  • the detection electrode selector switch 113 sets all the detection electrodes Y1 to Y6. Are sequentially selected at a constant time interval Ts, and an AC signal is output to the detection circuit 114 from the selected detection electrodes Yn (1 ⁇ n ⁇ 6).
  • the scan is repeated after returning to the first drive electrode X1. All scans of the drive electrodes X1 to X6 and the detection electrodes Y1 to Y6 are completed at the frame time Tf, and the scan of the next frame is started. This scanning operation is sequentially repeated under the control of the control circuit 115.
  • the detection circuit 114 detects the position on the touch panel 100 touched by the detection object F based on the switching control signals SEL1 and SEL2 input from the control circuit 115 and the comparison result between the detection voltage Vd and the threshold voltage Vth.
  • the switch control signal SEL1 of the switch TSW3 is at the high level “H” and the switch RSW3 is switched.
  • the detection circuit 114 detects the detection voltage Vd smaller than the threshold voltage Vth.
  • the detection circuit 114 detects the touch of the detection object F at the timing when the drive electrode X3 is connected to the AC signal source 110 and the detection electrode Y3 is connected to the detection circuit 114.
  • FIG. 5A is a configuration diagram of a region touched by the detection target F of the touch panel device 1 illustrated in FIG. 3.
  • FIG. 5B is an equivalent circuit diagram of a transmission path from the AC signal source 110 to the detection circuit 114.
  • the AC signal source 110 When the drive electrode X3 and the detection electrode Y3 are selected in the touch panel device 1, the AC signal source 110, the inductance element 111, the input terminal P1 of the drive electrode X3, the intersection P33 of the drive electrode X3 and the detection electrode Y3, and the detection electrode Y3 A transmission path 117 through which an AC signal current that reaches the detection circuit 114 via the output terminal P3 flows is formed.
  • a resistor Rd exists from the input terminal P1 of the drive electrode X3 to the intersection P33 of the drive electrode X3 and the detection electrode Y3, and a resistance Rs exists from the intersection P33 to the output terminal P3 of the detection electrode Y3.
  • the drive electrodes X2 and X4 adjacent to the drive electrode X3 are connected to the ground. Therefore, stray capacitances Cs1 and Cs2 exist between the drive electrode X3 and the drive electrodes X2 and X4, respectively. Further, a stray capacitance Cs3 also exists between the drive electrode X3 and the panel ground.
  • the detection electrodes Y2 and Y4 adjacent to the detection electrode Y3 are connected to the ground. Therefore, stray capacitances Cs4 and Cs5 exist between the detection electrode Y3 and the detection electrodes Y2 and Y4. Further, a stray capacitance Cs6 exists also between the detection electrode Y3 and the panel ground.
  • a series resonant circuit is formed by the capacitance.
  • the resonance frequency fres of this series resonance circuit is expressed by (Equation 1).
  • the stray capacitance Csd is determined by the width of the drive electrode X3, the distance to the adjacent drive electrodes X2 and X4, the panel ground, the shield layer 106, and the like.
  • the inductance element 111 When the inductance element 111 is not electrically connected between the drive electrode and the AC signal source 110 in a touch panel mounted on a general information terminal (for example, a smartphone or a tablet PC), resonance of the drive electrode The frequency becomes a high frequency of several tens of MHz or more. On the other hand, the frequency of the AC signal output from the AC signal source 110 of the touch panel device mounted on a general information terminal is about several tens of kHz to 500 kHz. Also from this, unless the inductance element 111 is electrically connected between the drive electrode and the AC signal source 110, it is generally difficult to resonate the drive electrode at the frequency of the AC signal.
  • the resonance frequency of the drive electrode can be reduced.
  • the frequency of the AC signal The drive electrode can be made to resonate and the sensitivity of the touch panel 100 can be improved.
  • the frequency of the AC signal output from the AC signal source 110 of the touch panel device mounted on a general information terminal is about several tens of kHz to 500 kHz is when the AC signal is transmitted between the drive electrode and the detection electrode. This is because the drive electrode and the detection electrode function as a low-pass filter, and when an AC signal having a high frequency of 500 kHz or higher is input, the AC signal is greatly attenuated during transmission through each electrode. Therefore, in general, the frequency of the AC signal is a frequency that is equal to or lower than the cutoff frequency when the drive electrode and the detection electrode function as a low-pass filter, and reduces power loss during signal transmission through each electrode. Yes.
  • the resonance frequency of the drive electrode and the like can be lowered by further increasing the inductance of the inductance element 111.
  • the drive electrode and the like can be resonated even at a frequency of 500 kHz or less. It becomes possible. Thereby, a highly sensitive touch panel device 1 can be realized.
  • the inductance of the inductance element 111 when the inductance of the inductance element 111 is increased in order to lower the resonance frequency of the drive electrode or the like to be lower than the cutoff frequency of the drive electrode, the resistance loss of the inductance element 111 increases in proportion to the magnitude of the inductance. End up. If the inductance is excessively increased, the sensitivity of the touch panel device 1 may decrease due to power loss in the inductance element 111. For this reason, the structure of the drive electrode or the like may be designed so that the cutoff frequency of the drive electrode or the like is as high as possible.
  • the target value of the resonance frequency by the inductance element 111 and the drive electrode or the like is near the cutoff frequency of the drive electrode or the like (for example, about 1.0 MHz to 1.5 MHz for a touch panel device for a general communication device). It is good also as a structure which considers so that it may set and the inductance of the inductance element 111 may not become large too much.
  • the frequency of the AC signal output from the AC signal source 110 is set in the vicinity of the resonance frequency fres formed by the inductance element 111 and the drive electrode.
  • the cutoff frequency fc of the transmission line 117 is the time constant (Rd ⁇ Csd) of the low-pass filter constituted by the drive electrode X3 and the time constant of the low-pass filter constituted by the detection electrode Y3. It has a relationship of (Rs ⁇ Css) and (Equation 2).
  • FIG. 6A shows the intensity of the electric field reaching the detection electrode from the drive electrode in the touch panel device of the comparative example to which the inductance element 111 is not connected.
  • FIG. 6B is a diagram showing the intensity of the electric field reaching the detection electrode from the drive electrode in the touch panel device 1 in Embodiment 1 in which the drive electrode and the like are resonated at the frequency of the AC signal of the AC signal source 110 by the inductance element 111.
  • the same inductance element 111 is connected to all the drive electrodes X1 to X6.
  • the values of the resistance Rd and the stray capacitance Csd of the drive electrodes X1 to X6 vary, the input impedances of the drive electrodes do not match and vary. Therefore, when the drive electrodes X1 to X6 are resonated using the same inductance element 111, the resonance frequencies of the drive electrodes X1 to X6 have different values. As a result, when the frequency of the AC signal is one, it may be difficult to flow a large resonance current through all the drive electrodes X1 to X6.
  • FIG. 7A is a configuration diagram of another touch panel device 1002 according to Embodiment 1. 7A, the same reference numerals are given to the same portions as those of the touch panel device 1 shown in FIG. In the touch panel device 1002 shown in FIG. 7A, the drive electrodes X1 to X6 are divided into two groups: a group GA composed of drive electrodes X1 to X3 having close input impedance and a group GB composed of drive electrodes X4 to X6 having close input impedance.
  • An inductance element 111a having an inductance La is connected in series to the drive electrodes X1 to X3 belonging to the group GA.
  • An inductance element 111b having an inductance Lb is connected in series to the drive electrodes X4 to X6 belonging to the group GB.
  • FIG. 7B is a configuration diagram of still another touch panel device 1003 according to Embodiment 1. 7B, the same reference numerals are given to the same portions as those of the touch panel device 1002 shown in FIG. 7A. In the touch panel device 1003 shown in FIG.
  • the drive electrodes X1, X6 at both ends are grouped into a group GA, and the drive electrodes X2, X3, X4, X5 between the drive electrodes X1, X6 are grouped into a group GB. It is considered that the driving electrodes X1 and X6 at both ends are different from the driving electrodes X2, X3, X4, and X5 between the driving electrodes X1 and X6 in the surroundings and have different stray capacitances. On the other hand, the drive electrodes X1 and X6 belonging to the group GA are in a similar surrounding situation, and thus have similar stray capacitances.
  • the drive electrodes X2, X3, X4, and X5 belonging to the group GB are in a similar surrounding situation, and thus have similar stray capacitances. Thereby, the variation in the input impedance of the drive electrodes of the groups GA and GB can be reduced.
  • an inductance element that can resonate each drive electrode may be electrically connected between each of the drive electrodes X1 to X6 and the drive electrode changeover switch 112.
  • FIG. 8 is a configuration diagram of still another touch panel device 1004 according to the first embodiment.
  • inductance elements 111-1 to 111-6 are arranged between the drive electrode changeover switch 112 and the drive electrodes X1 to X6, and different inductance elements are provided for all the drive electrodes X1 to X6.
  • 111-1 to 111-6 are connected. That is, in FIG. 8, one terminal of the drive electrode selector switch 112 is connected to the inductance elements 111-1 to 111-6, and the other terminal is connected to the AC signal source 110.
  • the drive electrode selector switch 112 switches the connection state between the inductance elements 111-1 to 111-6 and the AC signal source 110 between an open state and a short circuit state.
  • the resonance frequency fres can be adjusted more accurately.
  • the detection sensitivity can be made uniform in all the drive electrodes X1 to X6.
  • the number of inductance elements is increased to cope with variations in the input impedance of the drive electrodes and the like.
  • the AC signal source has a frequency at which each electrode resonates due to the input impedance of each electrode and the inductance shown in FIG.
  • the frequency of the output signal may be changed for each electrode to be driven.
  • an inductance element for resonating the detection electrodes Y1 to Y6 is electrically connected between the detection electrodes (second electrodes) Y1 to Y6 and the detection circuit 114. It is good also as composition which is not done. In this configuration, the resonance frequency of each of the detection electrodes Y1 to Y6 is different from the frequency of the AC signal, and it is possible to avoid the detection sensitivity of the detection electrodes Y1 to Y6 from becoming too high.
  • the detection electrodes Y1 to Y6 receive noise radiated from these noise sources with high sensitivity, and it is difficult for the detection circuit 114 to detect an AC signal. Can be avoided.
  • the “resonance frequency” in the first embodiment refers to the first electrode changeover switch (drive electrode changeover switch or X electrode changeover) from the connection point of the inductance element with the AC signal source or the detection signal input point of the detection circuit.
  • FIG. 9 is a configuration diagram of the touch panel device 2 according to the second embodiment.
  • the touch panel device 2 according to the second embodiment includes a touch panel 120 instead of the touch panel 100 and further includes a divided electrode changeover switch 127.
  • the drive electrode Xm (1 ⁇ m ⁇ 6) is substantially equal to the drive electrode Xm1 (1 ⁇ m ⁇ 6) (third electrode) and Xm2 (1 ⁇ m ⁇ 6) (fourth electrode) is divided into two drive electrodes.
  • the divided electrode changeover switch is further added to the drive electrode changeover switch 112. 127 are connected in series.
  • the divided electrode changeover switch 127 includes switches TSW7 to TSW12.
  • the control circuit 115 controls the divided electrode changeover switch 127 to connect the drive electrode Xm2 (1 ⁇ m ⁇ 6) to the AC signal source 110 while the detection electrode changeover switch 113 scans the detection electrodes Y1 to Y3.
  • the drive electrode Xm1 (1 ⁇ m ⁇ 6) is connected to the AC signal source 110, and an AC signal is input to the drive electrode.
  • the drive electrodes X1 to X6 are divided into two in this way, the effective length of each drive electrode after division can be shortened (substantially 1 ⁇ 2 in FIG. 9) compared to the drive electrode before division.
  • the resistance Rd and stray capacitance Csd of the drive electrode are smaller than those of the drive electrode that is not divided.
  • the cut-off frequency fc when the drive electrode is viewed as a transmission line can be made higher than the cut-off frequency fc when the drive electrode is not divided.
  • the frequency of the AC signal can be increased as compared with the case where the drive electrode is not divided, so that the inductance of the inductance element 111 can be reduced and the resistance loss in the inductance element 111 can be reduced. Thereby, the electric field and magnetic field radiated from the drive electrode can be enhanced.
  • the AC signal input from the AC signal source 110 passes through the path 122.
  • the AC signal input from the AC signal source 110 passes through the path 123.
  • the length of the drive electrode X32 included in the path 123 is shorter than the length of the drive electrode (X3) included in the path 122.
  • the inductance element 111 is one element.
  • the circuit configuration is simplified, and a small and inexpensive touch panel device can be realized.
  • the touch panel device 2 of FIG. 9 can be realized by one AC signal source 110, the circuit configuration is simplified and the power consumption can be reduced.
  • the divided electrode changeover switch 127 is configured as a switch different from the drive electrode changeover switch 112, but the divided electrode changeover switch 127 may be included in the drive electrode changeover switch 112.
  • the drive electrode is divided into two at a substantially central portion in the Y-axis direction.
  • a pair of divided electrodes for example, the drive electrodes X11 and X12
  • the input impedance of the pair is approximate, it is not necessary to prepare an inductance element for each of the divided electrodes. Thereby, a small touch panel device can be realized.
  • FIG. 10 is a configuration diagram of Modification 1 of touch panel device 2 according to the second embodiment.
  • AC signals having opposite phases are simultaneously input from one AC signal source 110 to the two divided drive electrodes Xm1 (1 ⁇ m ⁇ 6) and drive electrodes Xm2 (1 ⁇ m ⁇ 6).
  • An inductance element 111 is connected to the AC signal source 110.
  • the inductance element 111 is connected to the drive electrode changeover switch 124 directly and via the phase inversion circuit 125.
  • the drive electrode selector switch 124 is composed of six switches TSW13 to 18 that are sequentially switched, and each of the switches TSW13 to TSW18 is composed of two switches SW1 and SW2 that operate so as to be simultaneously interrupted. Therefore, the AC signals whose phases are mutually inverted from the AC signal source 110 are simultaneously applied to the two drive electrodes Xm1 (1 ⁇ m ⁇ 6) and the drive electrodes Xm2 (1 ⁇ m ⁇ 6) selected by the drive electrode changeover switch 124. Is entered.
  • FIG. 11 is a configuration diagram of a second modification of the touch panel device 2 according to the second embodiment.
  • in-phase AC signals are simultaneously input from one AC signal source 110 to the two divided drive electrodes Xm1 (1 ⁇ m ⁇ 6) and drive electrodes Xm2 (1 ⁇ m ⁇ 6).
  • This modified example is different from the touch panel device 2 in that the drive electrode Xm1 and the drive electrode Xm2 are simultaneously connected to the AC signal source 110 without being switched, and an in-phase AC signal is simultaneously input to each drive electrode. is there.
  • the divided electrode changeover switch 127 of FIG. 9 is not necessary, and the circuit configuration can be simplified, and the phase inversion circuit 125 of FIG. 10 is also unnecessary, and the circuit configuration can be further simplified.
  • FIG. 12 is a configuration diagram of a third modification of the touch panel device according to the second embodiment. In this modification, AC signals from different AC signal sources are simultaneously input to the two divided drive electrodes.
  • AC signals are input from two different AC signal sources 110a and 110b to the drive electrode Xm1 (1 ⁇ m ⁇ 6) and the drive electrode Xm2 (1 ⁇ m ⁇ 6) divided into two.
  • the drive electrode Xm1 (1 ⁇ m ⁇ 6) is connected to the AC signal source 110a via the drive electrode changeover switch 112a and the inductance element 111a.
  • the drive electrode Xm2 (1 ⁇ m ⁇ 6) is connected to the AC signal source 110b via the drive electrode changeover switch 112b and the inductance element 111b.
  • the drive electrode changeover switch 112a and the drive electrode changeover switch 112b are switched so as to select the same drive electrodes Xm1 and Xm2 of the integer m at the same time.
  • FIG. 13 is a configuration diagram of Modification 4 of the touch panel device according to Embodiment 2.
  • the drive electrodes X1 to X6 are divided, but the same effect can be obtained by dividing the detection electrodes Y1 to Y6.
  • the detection electrodes Y1 to Y6 are divided into two at a substantially central portion in the X-axis direction, and the divided detection electrode Yn1 (1 ⁇ n ⁇ 6) (fifth electrode) and detection electrode Yn2 (1 ⁇ n ⁇ 6) (sixth electrode) outputs AC signals separately.
  • the detection electrodes Y1 to Y6 are each divided into two detection electrodes, that is, a detection electrode Yn1 (1 ⁇ n ⁇ 6) and a detection electrode Yn2 (1 ⁇ n ⁇ 6).
  • the detection electrode Yn1 (1 ⁇ n ⁇ 6) is connected to the detection circuit 114a via the detection electrode changeover switch 113a.
  • the detection electrode Yn2 (1 ⁇ n ⁇ 6) is connected to the detection circuit 114b through the detection electrode switch 113b.
  • the detection electrode change-over switch 113a scans the detection electrodes Yn1 (1 ⁇ n ⁇ 6) sequentially connected to the detection circuit 114a while the drive electrodes X1 to X3 are selected by the drive electrode change-over switch 112.
  • the detection electrode change-over switch 113b scans so that the detection electrode Yn2 (1 ⁇ n ⁇ 6) is sequentially connected to the detection circuit 114b while the drive electrodes X4 to X6 are selected by the drive electrode change-over switch 112.
  • the average effective length of the detection electrode in the transmission path from the AC signal source 110 to the detection circuit 114a or the detection circuit 114b can be shortened.
  • the average effective value of the resistance Rs and the stray capacitance Css of the detection electrode becomes smaller than before the division.
  • the cut-off frequency fc of the transmission line can be made higher than the cut-off frequency fc when the detection electrode is not divided.
  • the touch panel 121 of Embodiment 2 uses a long-axis electrode (Y electrode) longer than the X electrode as the detection electrode, the effect of increasing the cut-off frequency is greater when the detection electrode is divided. From this technical idea, the electrodes may be divided in preference to those having a long electrode length.
  • one drive electrode of the drive electrodes (drive electrode Xn (1 ⁇ n ⁇ 3) in FIG. 13) facing the detection electrode Yn1 (1 ⁇ n ⁇ 6) and the detection electrode Yn2 (1
  • the AC signal from the AC signal source 110 is input to one of the drive electrodes (in FIG. 13, the drive electrode Xn (4 ⁇ n ⁇ 6)) opposed to ⁇ n ⁇ 6).
  • the drive electrode changeover switch 112 may be controlled.
  • two of the drive electrodes X1 to X6 can be scanned simultaneously, and the scan time of the drive electrodes X1 to X6 can be shortened.
  • the detection circuits 114a and 114b are connected to the respective divided detection electrodes. However, the detection electrode changeover switch 113a and the detection circuit 114a, and the detection electrode changeover switch 113b and the detection circuit 114b are not operated simultaneously. Thus, similarly to the touch panel device 2 shown in FIG. 9, one detection electrode changeover switch and one detection circuit can be switched and controlled by the divided electrode changeover switch. In this way, since only one detection circuit is required, the circuit configuration is simplified and power consumption can be reduced.
  • FIG. 14 is a configuration diagram of Modification 5 of the touch panel device according to Embodiment 2.
  • both the drive electrode and the detection electrode are divided into two at the substantially central portions thereof.
  • the drive electrode Xm (1 ⁇ m ⁇ 6) is divided into the drive electrode Xm1 (1 ⁇ m ⁇ 6) and the drive electrode Xm2 (1 ⁇ m ⁇ 6), and the detection electrode Yn (1 ⁇ n ⁇ 6) is the detection electrode Yn1. (1 ⁇ n ⁇ 6) and detection electrode Yn2 (1 ⁇ n ⁇ 6).
  • Other configurations are the same as those shown in FIGS.
  • the average effective lengths of the drive electrodes and the detection electrodes in the transmission path from the AC signal source 110a to the detection circuit 114a and in the transmission path from the AC signal source 110b to the detection circuit 114b are further shortened.
  • the average effective value of the resistance Rd of the drive electrode, the resistance Rs of the detection electrode, the stray capacitance Csd of the drive electrode, and the stray capacitance Css of the detection electrode is further reduced as compared with a touch panel device having electrodes that are not divided.
  • the cut-off frequency fc of the transmission line can be made higher than the cut-off frequency fc when the electrodes are not divided.
  • the AC signal source, the drive electrode changeover switch, and the detection electrode changeover switch may be one system, and the divided drive electrode and detection electrode may be switched.
  • one of the drive electrodes (in FIG. 14, Xn1 (1 ⁇ n ⁇ 3)) and Xn2 (1 ⁇ n ⁇ 3) are opposed to the detection electrode Yn1 (1 ⁇ n ⁇ 6). 3) and a drive electrode (in FIG. 14, Xn1 (4 ⁇ n ⁇ 6)) facing one of the drive electrodes of the pair) and the detection electrode Yn2 (1 ⁇ n ⁇ 6).
  • the AC signal sources 110a and 110b is applied to one drive electrode of one of the two and a pair of Xn2 (a pair of 4 ⁇ n ⁇ 6).
  • the switches 112a and 112b may be controlled.
  • the short-axis electrode (X electrode) is used as the drive electrode
  • the long-axis electrode (Y electrode) may be used as the drive electrode.
  • the resistance Rd and the stray capacitance Csd of the drive electrode are larger than when the drive electrode is used as the X electrode, so that the effect of dividing the electrode is greater.
  • FIG. 15A is a configuration diagram of Modification 6 of the touch panel device according to Embodiment 2.
  • an AC signal is detected by a differential amplifier connected to two detection electrodes.
  • FIG. 15A only selected electrodes are indicated by solid lines, and unselected electrodes are indicated by broken lines.
  • FIG. 15A relates to detection of Modification 2 shown in FIG.
  • the differential amplifier 126 has a non-inverting input terminal (+), an inverting input terminal ( ⁇ ), and an output terminal, and is obtained by subtracting a signal input to the inverting input terminal from a signal input to the non-inverting input terminal. The difference is output from the output terminal.
  • the drive electrode X3 is divided into a drive electrode X31 and a drive electrode X32.
  • the detection signal from the detection electrode Y2 that intersects the drive electrode X32 is connected to the non-inverting input terminal of the differential amplifier 126.
  • a detection signal from the detection electrode Y4 that intersects the drive electrode X31 is connected to the inverting input terminal of the differential amplifier 126.
  • the differential amplifier 126 outputs a difference between the detection signal of the detection electrode Y2 and the detection signal of the detection electrode Y4 to the detection circuit 114. Thereby, in-phase noise from the LCD 107 and the like picked up by the detection electrode Y2 and the detection electrode Y4 can be removed, and the detection sensitivity of the touch panel device 2 can be increased.
  • detection as to which of the detection electrodes Y2 and Y4 is touched can be specified by the polarity of the detection signal of the differential amplifier 126.
  • the voltage of the signal output from the detection electrode closer to the detection target F becomes lower as shown in FIG. 2E. Therefore, in the circuit shown in FIG.
  • the detection circuit 114 can determine that the detection electrode Y2 is touched. When the absolute value of the signal output from the differential amplifier 126 is less than a predetermined threshold value, the detection circuit 114 can determine that it is not touched near either of the detection electrodes Y2 and Y4.
  • FIG. 15B is a configuration diagram of Modification 7 of the touch panel device according to Embodiment 2.
  • FIG. 15B relates to detection of the fourth modification illustrated in FIG. 13.
  • the detection electrode Y2 is divided into two detection electrodes Y21 and Y22.
  • a detection signal from the detection electrode Y22 that intersects the drive electrode X5 is connected to the non-inverting input terminal of the differential amplifier 126.
  • the detection signal from the detection electrode Y21 that does not intersect the drive electrode X5 is connected to the inverting input terminal of the differential amplifier 126.
  • the differential amplifier 126 outputs a difference between the detection signal of the detection electrode Y22 and the detection signal of the detection electrode Y21 to the detection circuit 114.
  • the detection as to which of the detection electrodes Y21 and Y22 is touched can be specified by the polarity of the detection signal of the differential amplifier 126. Similar to the circuit shown in FIG. 15A, in the circuit shown in FIG. 15B, when the signal output from the differential amplifier 126 is positive and the absolute value of the signal is equal to or greater than a predetermined threshold, the detection electrode Y21 The detection circuit 114 can determine that a touch has been made nearby.
  • the detection circuit 114 can determine that the detection electrode Y22 has been touched. When the absolute value of the signal output from the differential amplifier 126 is less than a predetermined threshold value, the detection circuit 114 can determine that it is not touched near any of the detection electrodes Y21 and Y22.
  • the detection electrodes connected to the inverting input terminal and the non-inverting input terminal of the differential amplifier 126 are similarly close to the touched position even if the detection electrodes shown in FIGS. 15A and 15B are reversed.
  • the detection electrode can be detected.
  • FIG. 16 and 17 are configuration diagrams of the touch panel device 3 according to the third embodiment.
  • the same reference numerals are assigned to the same parts as those of touch panel device 1 in the first embodiment shown in FIG. Unlike the first embodiment, the touch panel device 3 according to the third embodiment receives an AC signal from both ends of one drive electrode.
  • one end Pe1 and the other end Pe2 of the drive electrode X3 are driven by one AC signal source 110 in a state where the drive electrode X3 and the detection electrode Y5 are selected (a state where the touch of the intersection P35 is detected).
  • AC signal is input from.
  • both ends (end Pe1 and end Pe2) of drive electrode X3 are electrically connected. That is, one terminal electrically connected to the drive electrode X3 of the drive electrode changeover switch is electrically connected to two ends of the drive electrode X3 in the Y-axis direction in a short-circuited state.
  • a path 131 and a path 132 as shown in FIG. 16 exist as paths through which the AC signal passes from the AC signal source 110 to the detection circuit 114.
  • the path 131 is a path that reaches the detection circuit 114 via the end Pe1 of the drive electrode X3 and the intersection P35.
  • the path 132 is a path that reaches the detection circuit 114 via the end Pe2 of the drive electrode X3 and the intersection P35.
  • the length of the drive electrode X3 included in the path 131 is shorter than the length of the drive electrode X3 included in the path 132. Therefore, the resistance Rd1 of the drive electrode X3 included in the path 131 is smaller than the resistance Rd2 of the drive electrode X3 included in the path 132. Therefore, a larger AC signal current flows through the path 131.
  • one end Pe1 and the other end Pe2 of the drive electrode X3 from one AC signal source 110 in a state where the drive electrode X3 and the detection electrode Y2 are selected (a state in which a touch at the intersection P32 is detected).
  • AC signal is input from.
  • the two ends (the end Pe1 and the end Pe2) of the drive electrode X3 are electrically connected in a short-circuited state.
  • the path 133 is a path that reaches the detection circuit 114 via the end Pe1 of the drive electrode X3 and the intersection P32.
  • the path 134 is a path that reaches the detection circuit 114 via the end Pe2 of the drive electrode X3 and the intersection P32.
  • the length of the drive electrode X3 included in the path 134 is shorter than the length of the drive electrode X3 included in the path 133. Accordingly, the resistance Rd4 of the drive electrode X3 included in the path 134 is smaller than the resistance Rd3 of the drive electrode X3 included in the path 133. Therefore, a larger AC signal current flows through the path 134.
  • FIG. 18 and 19 are configuration diagrams of another touch panel device 3A according to the third embodiment. 18 and 19, the same reference numerals are assigned to the same parts as those of touch panel device 1 in the first embodiment shown in FIG.
  • an AC signal is input from the AC signal source 110 to the drive electrode X2 in a state where the drive electrode X2 and the detection electrode Y2 are selected (a state in which a touch at the intersection P22 is detected), and the detection electrode
  • One end Ps1 and the other end Ps2 of Y2 are connected to one detection circuit 114.
  • both ends (the end Ps1 and the end Ps2) of the detection electrode Y2 are electrically connected.
  • one terminal electrically connected to the detection electrode Y2 of the detection electrode changeover switch is electrically connected to both ends of the detection electrode Y2 in the X-axis direction in a short-circuited state.
  • a path 135 is a path that reaches the detection circuit 114 via the AC signal source 110, the intersection P22, and the end portion Ps1.
  • the path 136 is a path that reaches the detection circuit 114 via the AC signal source 110, the intersection P22, and the end portion Ps2.
  • the length of the detection electrode Y2 included in the path 135 is shorter than the length of the detection electrode Y2 included in the path 136. Accordingly, the resistance Rs1 of the detection electrode Y2 included in the path 135 is smaller than the resistance Rs2 of the detection electrode Y2 included in the path 136. Therefore, more AC signal current flows through the path 135.
  • a path 137 is a path that reaches the detection circuit 114 via the AC signal source 110, the intersection P25, and the end portion Ps1.
  • the path 138 is a path that reaches the detection circuit 114 via the AC signal source 110, the intersection P25, and the end portion Ps2.
  • the length of the detection electrode Y2 included in the path 138 is shorter than the length of the detection electrode Y2 included in the path 137. Accordingly, the resistance Rs4 of the detection electrode Y2 included in the path 138 is smaller than the resistance Rs3 of the detection electrode Y2 included in the path 137. Therefore, more AC signal current flows through the path 138.
  • FIG. 20A is a schematic cross-sectional view of touch panel device 1000 according to Embodiment 4.
  • FIG. 20B is a diagram illustrating a waveform of a signal of the touch panel device 1000.
  • the same reference numerals are assigned to the same parts as those of touch panel device 1 in the first embodiment shown in FIG.
  • noise generated from the LCD 107 or the like is efficiently shielded.
  • the touch panel 100 has a shield layer 106 disposed between the LCD 107 and the electrode layer 108.
  • the shield layer 106 is disposed near the electrode layer 108, stray capacitances (stray capacitances Cs3 and Cs6 in FIG. 5A) are generated between the drive electrode 104, the detection electrode 102, and the shield layer 106, and the transmission line The cut-off frequency fc decreases.
  • Touch panel device 1000 according to the fourth embodiment further includes a ground switch SW10 connected between shield layer 106 and the ground and controlled by control circuit 115. By controlling the ground switch SW10, the stray capacitance can be reduced while shielding noise from the LCD 107 or the like.
  • the LCD 107 periodically reverses the polarity of the drive signal of the LCD 107 in order to prevent its own damage.
  • Spike-like noise occurs during a predetermined period Tn (hereinafter referred to as noise period Tn) when the polarity is reversed.
  • the noise period Tn is a predetermined period in an image display frame period T (for example, 1/60 Hz) for displaying an image. If the drive electrode 104 and the detection electrode 102 of the touch panel 100 pick up this noise, it causes a false detection.
  • the LCD 107 generates noise larger than the other periods in the noise period Tn.
  • the control circuit 115 is grounded so that the shield layer 106 is connected to the ground during the noise period Tn, and the shield layer 106 is disconnected from the ground during a part or all of the period excluding the noise period Tn.
  • the switch SW10 is controlled.
  • the control circuit 115 sets the frequency of the AC signal only during the noise period Tn.
  • the AC signal source 110 may be controlled so as to be lower than the cutoff frequency and lower than the frequency in a period other than the noise period Tn.
  • FIG. 20C is a schematic cross-sectional view of another touch panel device 1000A according to the fourth embodiment. 20C, the same reference numerals are given to the same portions as those of the touch panel device 1000 illustrated in FIG. 20A.
  • a touch panel device 1000A illustrated in FIG. 20C includes a variable inductance element 111V that can change the inductance instead of the inductance element 111.
  • the control circuit 115 switches the inductance of the variable inductance element 111V so as to lower the resonance frequency.
  • the control circuit 115 sets the inductance of the variable inductance element 111V during the noise period Tn to be larger than the period other than the noise period Tn, and the resonance frequency is increased even if the stray capacitance is increased by the conduction of the ground switch SW10. Can be matched to the frequency of the AC signal.
  • the variable inductance element 111V can be constituted by a plurality of inductance elements selected by the control circuit 115, for example.
  • the variable inductance element 111V can be configured by a plurality of inductance elements connected in series and a plurality of switches respectively connected in parallel to the inductance elements.
  • FIG. 21 is a configuration diagram of the touch panel device 1005 according to the fifth embodiment.
  • the same reference numerals are assigned to the same parts as those of touch panel device 1 in the first embodiment shown in FIG.
  • Touch panel device 1005 in the fifth embodiment efficiently shields noise generated from LCD 107 (FIG. 1) or the like.
  • electrodes drive electrodes and detection electrodes
  • LCD 107 LCD 107
  • the surrounding electrodes of the selected electrode are connected to the ground, and the stray capacitances Cs1, Cs2, Cs4, and Cs5 (FIG. 5A) between the selected electrode and the surrounding electrodes are increased, and the alternating current is increased.
  • the cutoff frequency fc of the transmission line from the signal source 110 to the detection circuit 114 is lowered. As a result, the attenuation amount of the AC signal input from the AC signal source 110 increases, and the detection sensitivity of the touch panel 100 decreases.
  • the control circuit 115 separates and opens only the electrode adjacent to the selection electrode having the largest stray capacitance between the selection electrode and the ground, the AC signal source 110, and the detection circuit 114,
  • the drive electrode changeover switch 112 and the detection electrode changeover switch 113 are controlled so that the selection electrode and the electrodes other than the electrode selection electrode adjacent thereto are connected to the ground. For example, as shown in FIG. 21, in a state in which a certain drive electrode X3 and a certain detection electrode Y3 are selected, the control circuit 115 performs another drive electrode X2, X4 adjacent to a certain drive electrode X3 and a certain detection.
  • the drive electrode changeover switch 112 and the detection electrode are connected so that the other detection electrodes Y2 and Y4 adjacent to the electrode Y3 are separated from the ground and opened, and the drive electrodes X1, X5 and X6 and the detection electrodes Y1, Y5 and Y6 are connected to the ground.
  • the changeover switch 113 is controlled.
  • Such control makes it possible to prevent the cutoff frequency fc from being lowered and to simultaneously block noise from the LCD 107 or the like, and to realize a touch panel device 1005 with high detection sensitivity. Furthermore, since the electrode close to the selection electrode is separated from the ground, the intensity of the electromagnetic field radiated from the selection electrode is increased, and detection of a farther detection target is possible.
  • the electrode to be separated from the ground does not have to be both the drive electrode and the detection electrode, and may be at least one of the electrodes.
  • the control circuit 115 connects the electrodes other than the selected electrode to the ground during the noise period Tn, and the period other than the noise period Tn. You may make it isolate
  • the electrode for cutting off the connection with the ground is not limited to the adjacent electrode, and an electrode further away from the selection electrode may be separated from the ground.
  • Embodiment 6 Touch panel device 6 according to Embodiment 6 will be described with reference to FIGS. 22 to 24B.
  • the touch panel device in Embodiments 1 to 5 is a mutual capacitance type touch panel device
  • the touch panel device in Embodiment 6 is a self-capacitance type touch panel device.
  • the self-capacitance type touch panel device detects the change in mutual capacitance at the intersection of the drive electrode and the detection electrode arranged in a grid
  • the self-capacitance type serves as the drive electrode and the detection electrode, It detects a change in capacitance (self-capacitance) between itself and ground.
  • FIG. 22 is a schematic cross-sectional view of touch panel 200 mounted on touch panel device 6 in the sixth embodiment.
  • the touch panel 200 is a self-capacitance type touch panel and has substantially the same structure as the mutual capacitance type touch panel 100.
  • the touch panel 200 includes a glass layer 103 that is an insulating layer, and a Y electrode 202 and an X electrode 204 that face each other with the glass layer 103 interposed therebetween.
  • the glass layer 103, the Y electrode 202, and the X electrode 204 constitute an electrode layer 208.
  • the Y electrode 202 and the X electrode 204 are arranged in a lattice pattern so as to extend at right angles to each other.
  • a drive voltage Vs which is an AC signal, is applied to each electrode from an AC signal source, and a change in the self-capacitance of each electrode is detected as a change in the AC signal voltage.
  • the Y electrode 202 is located closer to the protective layer 101 than the X electrode 204. Since both the X electrode 204 and the Y electrode 202 operate on the same principle, the Y electrode 202 closer to the protective layer 101, that is, the surface will be described below.
  • FIG. 23A to FIG. 23D are diagrams for explaining the operation principle of the self-capacitance type touch panel device 6.
  • FIG. 23A is a schematic cross-sectional view of the electrode layer 208 of the touch panel 200 of the touch panel device 6.
  • FIG. 23B is an equivalent circuit diagram of the touch panel 200 shown in FIG. 23A.
  • FIG. 23C shows the waveform of the drive voltage Vs applied to the Y electrode 202.
  • FIG. 23D shows a waveform of the detection voltage Vd3 when the detection target F such as the operator's finger is not touched, and a waveform of the detection voltage Vd4 when there is a touch.
  • a stray capacitance Csy exists between the Y electrode 202 and the ground.
  • a capacitance Cey is generated between the Y electrode 202 and the detection target F. Since a part of the electric charge charged in the stray capacitance Csy escapes to the ground through the finger due to the electrostatic capacitance Cey, the detection voltage Vd4 becomes smaller than the detection voltage Vd3 when there is no touch. Therefore, it is possible to detect a touch on the touch panel 200 by comparing the threshold voltage Vth set in advance with the detection voltage Vd.
  • the X electrode 204 operates similarly to the Y electrode 202.
  • FIG. 24A is a configuration diagram of the touch panel device 6 according to the sixth embodiment.
  • the touch panel device 6 includes a touch panel 200, AC signal sources 210a and 210b, an X electrode changeover switch 212a, a Y electrode changeover switch 212b, detection circuits 214a and 214b, and a control circuit 215. Prepare.
  • the longitudinal direction of the touch panel 200 is defined as the X axis, and the direction orthogonal to the X axis is defined as the Y axis.
  • the touch panel 200 includes a plurality of X electrodes 204 (first electrodes) and a plurality of Y electrodes 202 (second electrodes).
  • the plurality of X electrodes 204 are arranged at substantially equal intervals in the X-axis direction (first direction) and extend in the Y-axis direction (second direction).
  • the plurality of Y electrodes 202 are arranged at substantially equal intervals in the Y-axis direction and extend in the X-axis direction.
  • the X electrode 204 is composed of six X electrodes XS1 to XS6, and the Y electrode 202 is composed of six Y electrodes YS1 to YS6.
  • the X electrodes XS1 to XS6 are arranged in a lattice shape so as to extend at right angles to the Y electrodes YS1 to YS6 and to face each other through the glass layer 105.
  • the AC signal source 210a is connected to the X electrode changeover switch 212a (first electrode changeover switch) and the detection circuit 214a via the inductance element 211a.
  • the X electrode changeover switch 212a is connected to the X electrodes XS1 to XS6.
  • the AC signal source 210b is connected to the Y electrode changeover switch 212b (second electrode changeover switch) and the detection circuit 214b via the inductance element 211b.
  • the Y electrode changeover switch 212b is connected to the Y electrodes YS1 to YS6.
  • the X electrode changeover switch 212a and the Y electrode changeover switch 212b are controlled by the control circuit 215.
  • the configuration and operation of the X electrode changeover switch 212a and the Y electrode changeover switch 212b operate in the same manner as the drive electrode changeover switch 112 and the detection electrode changeover switch 113 of the first embodiment.
  • a stray capacitance Csx exists between the X electrodes XS1 to XS6 and the ground.
  • the resonance frequency fresx of the series resonance circuit in the transmission path from the AC signal source 210a to the detection circuit 214a is determined by the value of the inductance La of the inductance element 211a and the stray capacitance Csx, and is expressed by (Equation 3).
  • the cutoff frequency fcx of the transmission line from the AC signal source 210a to the detection circuit 214a is proportional to the reciprocal of the time constant (Rx ⁇ Csx) determined by the product of the resistance Rx of the X electrodes XS1 to XS6 and the stray capacitance Csx. To do. That is, the cutoff frequency fcx is expressed by (Equation 4).
  • a stray capacitance Csy exists between the Y electrodes YS1 to YS6 and the ground.
  • the resonance frequency fresy of the series resonance circuit in the transmission path from the AC signal source 210b to the detection circuit 214b is determined by the value of the inductance Lb of the inductance element 211b and the stray capacitance Csy, and is expressed by (Equation 5).
  • the cutoff frequency fcy of the transmission line from the AC signal source 210b to the detection circuit 214b is proportional to the reciprocal of the time constant (Ry ⁇ Csy) determined by the product of the resistance Ry of the Y electrodes YS1 to YS6 and the stray capacitance Csy. To do. That is, the cutoff frequency fcy is expressed by (Equation 6).
  • a resonance circuit is formed by connecting an inductance element between an AC signal source and an electrode, and a resonance current is passed through the electrode.
  • the electric field intensity around the electrode can be increased, and the detection sensitivity can be improved.
  • the self-capacitance type touch panel device is different from the mutual capacitance type touch panel device in detection principle, but the factors that determine the resonance frequency of the transmission path, the factors that determine the cutoff frequency, and the influence of noise from the LCD Are the same as those of the mutual capacitance type touch panel device. Therefore, the technology of the touch panel device in the first to fifth embodiments can be similarly applied to the touch panel device 6 in the sixth embodiment and has the same effect.
  • FIG. 24B is a configuration diagram of another touch panel device 6A according to the sixth embodiment. 24B, the same reference numerals are given to the same portions as those of the touch panel device 6 shown in FIG. 24A.
  • the touch panel device 6A includes inductance elements 211a-1 to 211a-6 and 211b-1 to 211b-6 instead of the inductance elements 211a and 211b of the touch panel device 6 shown in FIG. 24A, and includes an X electrode changeover switch 1212a and a Y electrode changeover switch. 1212b.
  • inductance elements 211a-1 to 211a-6 are connected in series between the X electrodes XS1 to XS6 and the X electrode changeover switch 212a to which AC signals are input.
  • Inductance elements 211b-1 to 211b-6 are connected in series between Y electrodes YS1 to YS6 to which AC signals are input and Y electrode changeover switch 212b, respectively.
  • the X electrode change-over switch 1212a sequentially connects the X electrodes XS1 to XS6 to the detection circuit 214a similarly to the X electrode change-over switch 212a, and the Y electrode change-over switch 1212b connects the Y electrodes YS1 to YS6 in the same manner as the Y electrode change-over switch 212b. This is connected to the sequential detection circuit 214b. Specifically, when the X electrode changeover switch 212a connects the inductance elements 211a-m (1 ⁇ m ⁇ 6) to the AC signal source 210a, the X electrode changeover switch 1212a connects the X electrode XSm to the detection circuit 214a. To do.
  • the Y electrode changeover switch 1212b connects the Y electrode YSn to the detection circuit 214b.
  • a circuit similar to the touch panel device 6 shown in FIG. 24A can be formed for each of the X electrodes XS1 to XS6 and the Y electrodes YS1 to YS6, and the position where the detection object F touches the touch panel 200 is highly sensitive. And it can detect with high precision.
  • FIG. 25A is a schematic cross-sectional view of touch panel device 1007 in the seventh embodiment.
  • Touch panel device 1007 shown in FIG. 25A further includes inductance element 140 connected in series between the input side of drive electrode 104 of touch panel device 1 in Embodiment 1 and the ground. That is, the inductance element 140 is connected in series between one end portion of the drive electrode 104 electrically connected to the inductance element 111 and the ground.
  • the stray capacitance Csd of the drive electrode 104 is selected by selecting the inductance of the inductance element 140 so that the inductance element 140 and the stray capacitance Csd of the drive electrode 104 resonate at the frequency of the AC signal of the AC signal source 110. Apparently small. Thereby, the cutoff frequency of the drive electrode can be increased, and the inductance of the inductance element 111 can be reduced. Thereby, the resistance loss in the inductance element 111 can be reduced, and the sensitivity of the touch panel device 1007 can be increased.
  • FIG. 25B is a schematic cross-sectional view of another touch panel device 1007A according to the seventh embodiment.
  • Touch panel device 1007A shown in FIG. 25B further includes shunt capacitor 141 connected in series between the output side end of drive electrode 104 of touch panel device 1 in Embodiment 1 and the ground. That is, the capacitor 141 is connected in series between at least one end in the extending direction of the drive electrode 104 electrically connected to the inductance element 111 and the ground.
  • the resonance frequency of the drive electrode 104 can be lowered, and as a result, the inductance of the inductance element 111 can be reduced.
  • the resistance loss in the inductance element 111 can be reduced, and the sensitivity of the touch panel device 1007A can be increased.
  • FIG. 26 is a configuration diagram of the touch panel 221 of the touch panel device according to the eighth embodiment.
  • the same reference numerals are assigned to the same portions as those of touch panel 200 of touch panel device 6 in Embodiment 6 shown in FIG. 24A.
  • a long-axis electrode (Y electrode in FIG. 26) has a larger resistance than a short-axis electrode (X electrode in FIG. 26).
  • the width W1 in the direction perpendicular to the X-axis direction in which the long-axis electrode extends is made wider than the width W2 in the direction perpendicular to the Y-direction in which the short-axis electrode extends. Thereby, the cutoff frequency of the transmission line from the AC signal source to the detector can be increased.
  • FIG. 27 is a configuration diagram of the touch panel 222 of another touch panel device according to the eighth embodiment.
  • the same reference numerals are assigned to the same parts as those of the touch panel 200 of the touch panel device 6 in the sixth embodiment shown in FIGS. 22 and 24A.
  • an electrode closer to the shield layer 106 (X electrode in FIG. 27) has a larger stray capacitance with the shield layer 106 than an electrode farther from the shield layer 106 (Y electrode in FIG. 27).
  • X electrode in FIG. 27 an electrode closer to the shield layer 106
  • Y electrode in FIG. 27 In the touch panel 222 in the eighth embodiment shown in FIG.
  • the width W4 in the direction perpendicular to the direction of the Y axis extending from the X electrode close to the shield layer 106 is perpendicular to the direction of the X axis extending from the Y electrode far from the shield layer 106. It is preferable to make it wider than the width W3 in the direction. Thereby, the resistance of the X electrode close to the shield layer 106 can be lowered, and the cutoff frequency of the transmission path from the AC signal source to the detector can be increased.
  • the configuration of the touch panel device in Embodiments 7 and 8 shown in FIGS. 25A to 27 can be applied to all of the touch panel devices in Embodiments 1 to 6, and has the same effect.
  • FIG. 28 is a configuration diagram of the touch panel device according to the ninth embodiment. 28, the same reference numerals are assigned to the same parts as those of touch panel device 1 in the first embodiment shown in FIG.
  • a touch panel device 1009 shown in FIG. 28 includes a touch panel 1019 instead of the touch panel 100 in the first embodiment.
  • the extending direction of the drive electrodes X1 to X6 is not perpendicular to the extending direction of the detection electrodes Y1 to Y6.
  • the intersection where the detection object F touches can be detected with high sensitivity. And has a similar effect.
  • the touch panel 100 may include only one drive electrode X1 and only one detection electrode Y1 facing the drive electrode X1.
  • This touch panel device can be used as a touch sensor that detects with high sensitivity whether or not a detection object has touched touch panel 100, and has the same effect as touch panel device 1 in the first embodiment.
  • the configuration of the touch panel device in the ninth embodiment can be applied to all the touch panel devices in the first to eighth embodiments and has the same effect.
  • the touch panel devices according to the first to eighth embodiments can increase both the detection position accuracy and the detection sensitivity with a simple configuration.
  • the LCD 107 is attached to the touch panels 100 and 200.
  • the LCD 107 is not necessarily an indispensable component in applications where touch detection is performed without displaying an image on the touch panel surface.
  • the drive electrode 104, the detection electrode 102, the X electrode 204, and the Y electrode 202 are arranged at substantially equal intervals. They may be arranged at different intervals. For example, if an area where the finger is frequently touched is specified on the touch panel 100, the resolution of the touch position can be increased by arranging the gap between the electrodes 102 and 104 in the area narrower than other areas. .
  • control circuits 115 and 215 sequentially switch the drive electrode switch 112, the detection electrode switch 113, the X electrode switch 212a, and the Y electrode switch 212b.
  • the electrodes are not necessarily switched sequentially. It may not be necessary and may be switched while skipping one or more electrodes.
  • control circuits 115 and 215 may switch the electrode changeover switches 112, 113, 212a, and 212b so as to select a plurality of electrodes simultaneously.
  • the control circuit 115 simultaneously maintains a plurality of adjacent drive electrodes X1, X2 among the plurality of drive electrodes X1 to X6 to the inductance element 111, and then drives the drive electrode X1.
  • the drive electrode changeover switch 112 may be controlled so that the drive electrodes X2 and X3 adjacent to each other are separated from the inductance element 111 and the connection to the inductance element 111 is maintained at the same time. Thereby, the sensitivity of the touch panel device 1 can be increased.
  • the touch panel device 1004 shown in FIG. 8 may be operated similarly.
  • the X electrodes XS1 and XS2 adjacent to each other among the plurality of X electrodes XS1 to XS6 are simultaneously connected to the inductance element 211a, and the Y electrodes YS1 to YS6 are mutually connected.
  • a plurality of adjacent Y electrodes YS1 and YS2 are simultaneously connected to the inductance element 211b, and then the electrodes XS1 and YS1 are disconnected from the inductance elements 211a and 211b, and a plurality of adjacent X electrodes XS2 and XS3 are simultaneously connected to the inductance element 211a.
  • the electrode change-over switches 212a and 212b may be controlled so that the plurality of Y electrodes YS2 and YS3 that are connected to each other are simultaneously connected to the inductance element 211b. Thereby, the sensitivity of the touch panel device 6 can be increased.
  • the touch panel device 6A shown in FIG. 24B may be operated similarly.
  • the plurality of electrodes selected at the same time may not be adjacent to each other.
  • the detection circuit 114 and 214 will detect a change in capacitance between the detection electrodes 102, Y from the electrode 202 to input AC signal electrodes or between electrodes and ground, always It may not be an AC signal, and may be another signal such as a DC signal.
  • the drive electrode 104 and the detection electrode 102 are divided at substantially the center in the direction in which each electrode extends.
  • the electrode may be divided at an arbitrary position other than the substantially central portion in the extending direction of the electrode.
  • the division position may be different in each electrode in consideration of the usage state of the touch panel. Thereby, for example, when the drive electrode is divided, the amount of energy loss lost in the drive electrode when an AC signal is transmitted through the drive electrode can be suppressed to the maximum, and a highly sensitive touch panel device can be realized.
  • the electrode is divided into two, but the same effect can be obtained even if the electrode is divided into three or more electrodes.
  • a rectangular wave may be used as an AC signal.
  • the resonance frequency of each electrode may vary from electrode to electrode.
  • the frequency of the AC signal and the resonance frequency of each electrode are significantly different, and an electrode with low sensitivity may be generated. Therefore, by using a rectangular wave having a frequency occupation band wider than that of a sine wave as an AC signal, even if the resonance frequency of each electrode varies, it is possible to prevent the AC signal frequency and the resonance frequency of each electrode from greatly differing. Can do.
  • the touch panel device includes a touch panel 100 having a drive electrode (first electrode) 104 and a detection electrode (second electrode) 102, and an AC signal having a predetermined frequency.
  • a touch panel 100 having a drive electrode (first electrode) 104 and a detection electrode (second electrode) 102, and an AC signal having a predetermined frequency.
  • the detection circuit 114 may detect a change in capacitance between the drive electrode 104 and the detection electrode 102 when a detection target touches the surface of the touch panel 100 based on a change in a signal output from the detection electrode 102.
  • the drive electrode 104 and the detection electrode 102 are arranged in a state where they are insulated from each other in a direct current manner.
  • the drive electrodes 104 are arranged at substantially equal intervals in the X-axis direction (first direction), and the Y-axis direction (second second) orthogonal to the X-axis direction.
  • the detection electrodes 102 (second electrodes) are arranged at substantially equal intervals in the Y-axis direction and extend in the X-axis direction.
  • the configuration of the drive electrode 104 and the detection electrode 102 is not limited to this, and the drive electrode 104 and the detection electrode 102 may be arranged and extended in an arbitrary direction.
  • the effects of the touch panel device according to the first to fifth embodiments are similarly exhibited even if the arrangement direction and the extending direction of the drive electrodes 104 and the detection electrodes 102 are arbitrary.
  • the drive electrode 104 and the detection electrode 102 are not only composed of a plurality of electrodes but also one electrode. The case where it consists of is also included.
  • the drive electrode 104 and the detection electrode 102 are Both may be formed on the same layer of the touch panel 100.
  • the drive electrode 104 and the detection electrode 102 are arranged on the same layer of the touch panel 100. Even if both of the detection electrodes 102 are formed, they are not short-circuited to each other.
  • the touch panel 100 can be thinned and the manufacturing process can be simplified.
  • the touch panel device includes a touch panel 100, an AC signal source 110, an inductance element 111, and a detection circuit 114.
  • the touch panel 100 is arranged at an arbitrary interval in the first direction and extends in a second direction different from the first direction, and a drive electrode 104 (first electrode) and an arbitrary interval in the third direction.
  • a detection electrode 102 (second electrode) that is arranged and extends in a fourth direction that is different from the third direction and three-dimensionally intersects with the second direction, and is disposed opposite to the drive electrode 104 with an insulating layer interposed therebetween;
  • Have The AC signal source 110 inputs an AC signal having a predetermined frequency to the drive electrode 104.
  • the inductance element 111 is electrically connected in series between the AC signal source 110 and the drive electrode 104.
  • the detection circuit 114 detects a change in capacitance at the intersection of the drive electrode 104 and the detection electrode 102 when a detection target touches the surface of the touch panel 100 based on a change in a signal output from the detection electrode 102.
  • the drive electrodes 104 are arranged at substantially equal intervals in the X-axis direction (first direction), and the Y-axis direction (second second) orthogonal to the X-axis direction.
  • the detection electrodes 102 are arranged at substantially equal intervals in the Y-axis direction and extend in the X-axis direction, but the drive electrodes 104 and the detection electrodes 102
  • the configuration need not be limited to this.
  • the extending direction of the drive electrode 104 (second direction) and the extending direction of the detection electrode 102 (fourth direction) are three-dimensionally crossed, and the first direction and the second direction.
  • the first, second, third, and fourth directions can be freely selected as long as the conditions are different and the conditions that the third direction and the fourth direction are different are satisfied.
  • the first direction and the third direction may be the same direction
  • the first direction and the fourth direction may be the same direction
  • the second direction and the third direction. May be in the same direction. Even if the first, second, third, and fourth directions have such a relationship, the effects of the touch panel device in the first to fifth embodiments are similarly exhibited.
  • both the drive electrode 104 (first electrode) and the detection electrode 102 (second electrode) may be composed of a plurality of electrodes.
  • the touch panel device outputs a drive electrode changeover switch 112 (first electrode changeover switch) that selects an electrode to which an AC signal is input from a plurality of drive electrodes 104 and a plurality of detection electrodes 102.
  • a configuration including a detection electrode changeover switch 113 (second electrode changeover switch) that selects an electrode whose signal is detected by the detection circuit 114, and a control circuit 115 that controls the drive electrode changeover switch 112 and the detection electrode changeover switch 113. It may be.
  • the drive electrode changeover switch 112 has a function of selecting an electrode to which an AC signal is input from the plurality of drive electrodes 104, and the detection electrode changeover switch 113 is selected from the plurality of detection electrodes 102. If the output signal has a function of selecting an electrode detected by the detection circuit 114, the effect of the touch panel device in the embodiment using the mutual capacitive touch panel can be exhibited.
  • a touch panel device using a self-capacitance type touch panel includes a touch panel 200 having an X electrode 204 (first electrode) and a Y electrode 202 (second electrode), and an AC signal having a predetermined frequency as X.
  • AC signal sources 210a and 210b input to the electrode 204 and the Y electrode 202, an inductance element 211a electrically connected in series between the AC signal source 210a and the X electrode 204, and detection circuits 114a and 114b, respectively.
  • the detection circuits 114a and 114b indicate the change in capacitance between the X electrode 204 and the ground or the change in capacitance between the Y electrode 202 and the ground when the detection object touches the surface of the touch panel 200.
  • Detection is based on changes in signals output from the electrode 204 and the Y electrode 202.
  • the X electrodes 204 are arranged at substantially equal intervals in the X-axis direction (first direction) and in the Y-axis direction (second direction) orthogonal to the X-axis direction.
  • the Y electrodes 202 (second electrodes) are arranged at substantially equal intervals in the Y-axis direction and extend in the X-axis direction.
  • the configurations of the X electrode 204 and the Y electrode 202 are the same.
  • the X electrode 204 and the Y electrode 202 may be arranged and extended in an arbitrary direction.
  • the effect of the touch panel device 6 in the sixth embodiment is exhibited similarly even if the arrangement direction and the extending direction of the X electrode 204 and the Y electrode 202 are arbitrary.
  • the X electrode 204 and the Y electrode 202 are not only composed of a plurality of electrodes, but only one. The case where it comprises from the electrode of this is also included. In this case, the X electrode changeover switch 212a and the Y electrode changeover switch 212b in FIG. 24A become unnecessary.
  • the X electrode 204 and the Y electrode 202 are Both may be configured to be formed in the same layer of the touch panel 200.
  • the arrangement direction and the extending direction of the X electrode 204 and the Y electrode 202 are determined so that the X electrode 204 and the Y electrode 202 do not cross each other, the X electrode 204 and the Y electrode 202 are arranged on the same layer of the touch panel 200. Even if both of the Y electrodes 202 are formed, they are not short-circuited to each other. In this manner, by forming both the X electrode 204 and the Y electrode 202 in the same layer of the touch panel 200, the touch panel 200 can be thinned and the manufacturing process can be simplified.
  • the touch panel device includes the touch panel 200, AC signal sources 210a and 210b, inductance elements 211a and 211b, and detection circuits 214a and 214b.
  • the touch panel 200 is arranged at an arbitrary interval in the first direction, and has a plurality of X electrodes 204 (first electrodes) extending in a second direction different from the first direction, and an arbitrary number in the third direction.
  • a plurality of Y electrodes 202 (second electrodes) arranged in an interval, extending in a fourth direction that is different from the third direction and intersecting the second direction, and arranged to face the X electrode 204 with an insulating layer interposed therebetween. Electrode).
  • the AC signal sources 210 a and 210 b input an AC signal having a predetermined frequency to the X electrode 204 and the Y electrode 202.
  • the inductance element 211a is electrically connected in series between the AC signal source 210a and the X electrode 204.
  • the inductance element 211b is electrically connected in series between the AC signal source 210a and the Y electrode 202.
  • the detection circuits 214a and 214b indicate the change in capacitance between the X electrode 204 and the ground or the change in capacitance between the Y electrode 202 and the ground when the detection object touches the surface of the touch panel 200. Detection is based on changes in signals output from the electrode 204 and the Y electrode 202.
  • the X electrodes 204 are arranged at substantially equal intervals in the X-axis direction (first direction), and the Y-axis direction (second direction) orthogonal to the X-axis direction.
  • the Y electrodes 202 (second electrodes) are arranged at substantially equal intervals in the Y-axis direction and extend in the X-axis direction.
  • the configuration of the X electrode 204 and the Y electrode 202 is Need not be limited to this.
  • the extending direction (second direction) of the X electrode 204 and the extending direction (fourth direction) of the Y electrode 202 are three-dimensionally crossed, and the first direction and the second direction
  • the first, second, third, and fourth directions can be freely selected as long as the conditions are different and the condition that the third direction and the fourth direction are different is satisfied.
  • the first direction and the third direction may be the same direction
  • the first direction and the fourth direction may be the same direction
  • the second direction and the third direction. May be in the same direction. Even if the first, second, third, and fourth directions have such a relationship, the effect of the touch panel device in the sixth embodiment is exhibited in the same manner.
  • both the X electrode 204 and the Y electrode 202 may be composed of a plurality of electrodes.
  • the touch panel device includes an X electrode changeover switch 212a for selecting an electrode for inputting an AC signal among a plurality of X electrodes 204, a Y electrode changeover switch 212b for selecting an electrode for inputting an AC signal among Y electrodes 202,
  • a configuration including a control circuit 215 for controlling the electrode changeover switch 212a and the Y electrode changeover switch 212b may be employed.
  • the X electrode changeover switch 212 a has a function of selecting an electrode to which an AC signal is input from among the plurality of X electrodes 204, and the Y electrode changeover switch 212 b is selected from among the plurality of Y electrodes 202. If the output signal has a function of selecting an electrode detected by the detection circuit 214, the effect described in the embodiment using the self-capacitance type touch panel can be exhibited.
  • the first electrode (the drive electrode 104 or the X electrode 204) of the touch panel device according to the embodiment using the self-capacitance touch panel and the mutual capacitance touch panel has the third electrode and the fourth electrode at arbitrary positions. It is divided into The control circuit (115 or 215) switches the first electrode so that an in-phase or out-of-phase AC signal is input simultaneously or alternately from the AC signal source (110a, 110b or 210a) to the third electrode and the fourth electrode.
  • the switch (drive electrode switch 112a, 112b or X electrode switch 212a) may be controlled. For example, in the touch panel device shown in FIG.
  • the drive electrode 104 is divided into the third electrode Xn1 and the fourth electrode Xn2 at an arbitrary position on the Y axis, but it is not necessary to be limited to the Y axis.
  • the effect of the touch panel device shown in FIG. 14 can be obtained.
  • this configuration can be applied not only to the mutual capacitive touch panel but also to a self capacitive touch panel, and has the same effect.
  • the X electrode 204 is divided into a third electrode and a fourth electrode at an arbitrary position in the Y-axis direction. Even if the changeover switch 212a is configured to determine the electrical connection state between the third electrode and the fourth electrode, and the AC signal source 210a and the detection circuit 214a, the effect of the divided electrodes shown in FIG. Can be exhibited similarly.
  • the second electrode (detection electrode 102 or Y electrode 202) of the touch panel device according to the embodiment using the self-capacitance touch panel and the mutual capacitance touch panel is divided into fifth and sixth electrodes at an arbitrary position. May be.
  • the control circuit (115 or 215) may be configured to control the second electrode changeover switch so that signals output from the fifth electrode and the sixth electrode are input to the detection circuit.
  • the detection electrode 102 is divided into the fifth electrode Yn1 and the sixth electrode Yn2 at an arbitrary position in the X-axis direction, but the detection electrode 102 needs to be limited to the X-axis direction. There is no.
  • the advantageous effects of the touch panel device shown in FIG. 14 can be obtained.
  • this configuration can be applied not only to a mutual capacitive touch panel but also to a touch panel device using a self capacitive touch panel.
  • the Y electrode 202 may be divided into a fifth electrode and a sixth electrode at an arbitrary position in the X-axis direction.
  • FIG. 1 Even if the Y electrode selector switch 212b is configured to determine the electrical connection state between the fifth electrode and the sixth electrode, and the AC signal source 210b and the detection circuit 214b, FIG. The effect of the divided electrodes shown can be exhibited as well.
  • each electrode is illustrated in a rectangular shape, but the shape is not limited to this, and the diamond shape and backgammon shape used in the current touch panel device are not limited thereto. The same effect can be obtained even if the shape is different.
  • a change in capacitance between the first electrode (X electrode) or the second electrode (Y electrode) and the ground when the detection target object touches the surface of the touch panel Is detected by a change in the signal output from the first electrode and the second electrode ”means a change in capacitance between the first electrode and the ground or between the second electrode and the ground.
  • the detection circuit detects a change in capacitance between only the change in the signal output from the first electrode, and a case where the detection circuit detects only a change in the signal output from the second electrode
  • the detection circuit detects from a change in the signal output from both the first electrode and the second electrode.
  • the change in the signal output from the X electrode 204 causes a change between the X electrode 204 and the ground.
  • the detection circuit 214a may detect a change in the capacitance of the Y electrode 202, or the detection circuit 214b may detect a change in the capacitance between the Y electrode 202 and the ground from the change in the signal output from the Y electrode 202. May be. Further, the change in capacitance between the X electrode 204 and the ground and the change in capacitance between the Y electrode 202 and the ground may be detected by the detection circuit 214a and the detection circuit 214b, respectively. The same applies when an AC signal is input from the AC signal source 210b to the Y electrode 202 (second electrode).
  • the inductance element in the embodiment refers to a chip component having an inductance component at the frequency of the AC signal, and does not refer to a transmission path from the AC signal source 110 to the detection circuit 114.
  • the frequency of the AC signal of the AC signal source 110 of the touch panel device 1 in the first to fifth embodiments is such that the first electrode changeover switch 112 and the second electrode have the maximum transmission loss from the AC signal source 110 to the detection circuit 114. This is determined based on the resonance frequency of the electrode in the combination of connection states of the changeover switch 113. For this reason, in the combination of the first electrode and the second electrode with the maximum transmission loss from the AC signal source 110 to the detection circuit 114, the relationship between the resonance frequency of the electrode and the frequency of the AC signal can be optimized, and the resonance current Therefore, it is possible to increase the sensitivity of the electrode whose detection sensitivity of the touch panel device 1 is most deteriorated.
  • the combination of the first electrode and the second electrode that maximizes the transmission loss from the AC signal source 110 to the detection circuit 114 is the combination of the electrode X3 and the electrode Y3 in FIG. That is, the electrodes X1, X2, X4 to X6, the electrodes Y1, Y2, and Y4 to Y6 are short-circuited to the ground, the electrode X3 is short-circuited to the inductance element 111, and the electrode Y3 is short-circuited to the detection circuit 114.
  • the first electrode changeover switch 112 and the second electrode changeover switch 113 are controlled by the control circuit 115 so as to be in the state, the transmission loss from the AC signal source 110 to the detection circuit 114 is maximized.
  • the electrode changeover switch 112 connects a certain first electrode X3 of the plurality of first electrodes X1 to X2 and the inductance element 111, and the second electrode changeover switch 113
  • a certain second electrode Y3 of the plurality of second electrodes Y1 to Y2 is connected to the detection circuit 114, and the other first electrodes X1, X2, and X4 to X6 are not connected to the inductance element 111.
  • the other second electrodes Y1, Y2, Y4 to Y6 are connected to the ground without being connected to the detection circuit 114, the transmission loss from the AC signal source 110 to the detection circuit 114 is maximized. .
  • the frequency of the AC signal source 110 is determined based on the resonance frequency of a certain first electrode X3 when the transmission loss from the AC signal source 110 to the detection circuit 114 is maximized.
  • the frequency of the AC signal source 110 is made the same as this resonance frequency.
  • the AC signal sources 210a and 210b include, for example, a certain first electrode XS3 and a plurality of second electrodes out of the plurality of first electrodes XS1 to XS6.
  • the transmission loss from the AC signal source 210a to the detection circuit 214a is maximized when an AC signal is input to a certain second electrode YS3 of the electrodes YS1 to YS6, and the transmission loss from the AC signal source 210b to the detection circuit 214b is maximized. Transmission loss is maximized.
  • the frequency of the AC signal is determined based on the resonance frequency of a certain first electrode XS3.
  • the frequency of the AC signal may be the same as this resonance frequency.
  • the transmission loss here refers to a transmission loss in a state where there is no detection target in an area where the detection target near the touch panel 100 can be detected.
  • the transmission loss is an AC signal input to the detection circuit 114 for the power level of the AC signal output from the AC signal source 110 when an AC signal output from the AC signal source 110 is input to the detection circuit 114. It refers to the degree of decrease in the signal power level.
  • the control circuit 115 controls the first electrode changeover switch 112 and the second electrode changeover switch 113 and the combination of the electrode X3 and the electrode Y3 is selected, the electrode X3 to which an AC signal is input. Is the frequency f1.
  • the frequency of the AC signal is set to the frequency f1
  • a resonance current that contributes to an improvement in detection sensitivity is generated in the combination of the electrode X3 and the electrode Y3, which has the largest transmission loss and the detection sensitivity of the touch panel may decrease. I can do things.
  • the frequency of the AC signal is the same as the resonance frequency f1 of the electrode X3.
  • the present invention is not limited to this, and a frequency around the resonance frequency f1 may be selected based on the resonance frequency f1. Since the conductivity of the transparent electrode, etc. is low, the Q value of the electrode does not become so high, so even if it slightly deviates from the resonance frequency of the electrode, the current value of the AC signal flowing through the electrode is greatly greater than the resonance current value at the resonance frequency. There is no decrease.
  • an AC signal input from an AC signal source can be resonated by a resonance circuit formed by the inductance element and the stray capacitance of the electrode, and a large resonance current can flow through the electrode. Since the resonance current can increase the strength of the electric field generated from the touch panel, a touch panel device with high detection position accuracy and high detection sensitivity can be provided.
  • the resonance frequency of each electrode is often different for each electrode. This is because the length of the transmission path between each electrode and the AC signal source is different, and also because each electrode has a different stray capacitance value. Therefore, when the frequency of the AC signal supplied from the AC signal source to each electrode is made common at the same frequency, the resonance frequency of the electrode and the frequency of the AC signal are greatly different in a certain electrode, and a large resonance current flows. It may also be difficult.
  • the AC signal source of the touch panel device according to the embodiment is based on the resonance frequency of the electrode in the combination of the connection states of the first and second electrode changeover switches that maximize the transmission loss from the AC signal source to the detection circuit. The frequency is determined.
  • the relationship between the resonance frequency of the electrode and the frequency of the AC signal can be optimized, and the resonance current Since it is possible to flow to the electrode, the sensitivity of the electrode having the lowest detection sensitivity of the touch panel device can be increased.
  • the “resonance frequency” in the embodiment refers to the first electrode changeover switch (drive electrode changeover switch or X electrode) from the connection point between the inductance element 111 (111-1 to 111-6) and the AC signal source 110.
  • the frequency at which the imaginary component of the input impedance when the target electrode is viewed via the changeover switch) or the second electrode changeover switch (detection electrode changeover switch or Y electrode changeover switch) is zero.
  • the AC signal source 110 is electrically connected to the AC signal source 110 in a combination of the connection states of the first and second electrode changeover switches 112 and 113 that maximize the transmission loss from the AC signal source 110 to the detection circuit 114. Is determined based on the resonance frequency of the electrode connected to the first electrode switch 112 and the second electrode switching switch 112 and the second frequency, in which the transmission loss from the AC signal source 110 to the detection circuit 114 is maximized.
  • the combination of the connection states of the electrode changeover switch 113 is the same as the resonance frequency of the electrode electrically connected to the AC signal source 110.
  • the technical idea is other than the mutual capacitance type touch panel device in the first to fifth embodiments. Can also be adapted.
  • the frequency of the AC signal includes the plurality of first electrodes and the plurality of second electrodes.
  • the frequency of the AC signal is determined from the resonance frequency of the electrode that maximizes the transmission loss from the AC signal source 110 or the AC signal source of the plurality of first electrodes and the plurality of second electrodes.
  • FIG. 29A shows the frequency characteristics Q1 and Q2 of the power of the signal propagating through a certain part of the electrode X2 in the touch panel device 1 in the first to fifth embodiments shown in FIG.
  • FIG. 29B shows frequency characteristics Q1 and Q2 of power of a signal propagating through a certain part of the electrode X2 in the touch panel device of the comparative example.
  • the vertical axis indicates the power propagating through that portion of the electrode X2
  • the horizontal axis indicates the frequency.
  • the plurality of first electrodes X1 to X6 and the plurality of first electrodes in the first state where the detection target does not exist in the detectable range of the touch panel 100 The resonance frequency of one of the two electrodes Y1 to Y6 is the frequency f0.
  • the frequency fb of the AC signal output from the AC signal source 110 may satisfy the relationship of (Equation 7).
  • the AC signal input from the AC signal source 110 is resonated by the resonance circuit formed by the stray capacitance of the inductance element 111 and the electrodes Xm and Yn (1 ⁇ m ⁇ 6, 1 ⁇ n ⁇ 6).
  • a large resonance current can be passed through the electrodes Xm and Yn. Since this resonance current can increase the strength of the electric field generated from the touch panel, it is possible to provide the touch panel device 1 having both high detection position accuracy and high detection sensitivity.
  • the resonance frequency of the electrode X2 in the second state where the detection target object touches the surface of the touch panel 100 is a frequency f1 lower than the frequency f0.
  • the frequency fb of the AC signal is substantially the same as the resonance frequency f0 of the electrode X2 in the first state.
  • the resonance frequency of the electrode X2 changes to the lower side by the change amount ⁇ f and becomes the frequency f1.
  • the power propagating through any part of the electrode X2 changes greatly from the power P0 in the first state to the power P1 in the second state, and decreases.
  • the power of the signal output from each of the electrodes Y1 to Y6 also greatly differs between the first state and the second state.
  • the detection circuit 114 By detecting the amount of change in the power of the signal output from each of the electrodes Y1 to Y6 by the detection circuit 114, it is possible to detect with high sensitivity whether or not the detection target has touched the surface of the touch panel 100 or in the vicinity thereof. Can do.
  • the condition of (Equation 7) for example, there is a difference between the power of the signal output from the electrode Y1 in the first state and the power of the signal output from the electrode Y1 in the second state. This can be similarly applied to the electrodes Y2 to Y6 other than the electrode Y1.
  • the frequency fb of the AC signal is between the resonance frequencies f0 and f1, and the frequency characteristics Q1 and Q2 intersect.
  • the power P0 of the signal propagating through any part of the electrode X2 in the first state and the power P1 of the signal propagating through that part of the electrode X2 in the second state are substantially the same.
  • the difference between the power value of the signal output from the electrode Y1 in the first state and the power value of the signal output from the electrode Y1 in the second state is reduced.
  • the touch panel device can detect with high sensitivity whether or not the detection target object touches the surface or the vicinity of the touch panel 100.
  • the frequency fb of the AC signal is lower than the resonance frequency f0 of the electrode Xm (1 ⁇ m ⁇ 6), and the electrode Xm when the detection target object touches the surface of the touch panel or is positioned nearby.
  • the resonance frequency f1 is the same, the power of the signal propagating through the electrode is higher in the situation where the detection object touches the surface of the touch panel than in the situation where the detection object does not exist in the detectable range of the touch panel. Increased by a factor of 2 (Ma> 1).
  • Ma a factor of 2
  • the power of the propagated signal is 1 / Mb times.
  • Ma and Mb are in the relationship of (Equation 8)
  • the difference from the value of the signal output from the electrode Yn when it does not exist in the possible range is small.
  • the resonance frequency f0 of the electrode and the frequency fb of the AC signal when the detection target does not exist in the detectable range of the touch panel satisfy the relationship of (Equation 7).
  • the frequency fb of the AC signal is always the resonance frequency f1 of the electrode (the resonance frequency of the electrode Xm when the detection object touches the surface of the touch panel).
  • the power of the signal propagating through the electrode Xm is smaller than when the detection target does not exist in the detectable range of the touch panel. That is, Ma takes a value smaller than 1.
  • the touch panel device of the embodiment does not satisfy (Equation 8), the value of the signal output from the second electrode Yn when the detection target touches the surface of the touch panel and the detection target are The difference from the value of the signal output from the second electrode Yn when it does not exist in the detectable range of the touch panel becomes large. Therefore, the touch panel device 1 with high detection sensitivity of the detection target can be realized.
  • FIG. 30A shows frequency characteristics Qn1 and Qn2 of normalized power of a signal propagating through a certain part of the electrode X2 in the touch panel device 1 in the first to fifth embodiments shown in FIG.
  • FIG. 30B shows frequency characteristics Qn1 and Qn2 of power of a signal propagating through a certain part of the electrode X2 in the touch panel device of the comparative example.
  • the vertical axis indicates the normalized power propagating through that portion of the electrode X2
  • the horizontal axis indicates the frequency.
  • the normalized power is a value obtained by dividing the power value shown in FIG. 29A by the maximum power value, that is, the power value at the resonance frequency.
  • the resonance frequencies f0 and f1 and the frequency fb of the AC signal may be configured so as to satisfy the condition shown in (Equation 9).
  • the frequency fb shown in FIG. 30A satisfies the relationship of (Equation 9) and is further away from the frequency f0 than from the frequency f1.
  • the normalized power of the signal propagating through any part of the electrode X2 changes from the normalized power Pn1 to the normalized power Pn2. That is, by changing from the first state to the second state, the absolute value of the difference between the frequency fb of the AC signal and the resonance frequency of the electrode X2 increases from the difference ⁇ f0 to the difference ⁇ f1.
  • the frequency fb of the AC signal is separated from the resonance frequency of the electrode X2, the power of the signal propagating through any part of the electrode X decreases.
  • the touch panel device in which the relationship between the resonance frequencies f0 and f1 and the frequency fb of the AC signal satisfies (Equation 9) has high sensitivity to the detection target.
  • the resonance frequencies f0 and f1 and the frequency fb of the AC signal do not satisfy the relationship of (Equation 9).
  • the absolute value of the difference between the frequency fb of the AC signal and the resonance frequency of the electrode X2 decreases from the difference ⁇ f0 to the difference ⁇ f1. That is, the amount of attenuation from the power value at the resonance frequency of the signal propagating through any part of the electrode X2 is smaller in the second state than in the first state. In other words, more power can be propagated to the electrode X2 in the second state than in the first state from the viewpoint of the resonance phenomenon.
  • FIGS. 29A and 29B can be applied not only to the electrode X2 but also to electrodes other than the electrode X2. These relationships can be similarly applied to the self-capacitance type touch panel shown in the sixth embodiment as well as the mutual capacitance type touch panel device in the first to fifth embodiments, and the same effect can be obtained.
  • the “detectable range” in the embodiment refers to a range in which the detection circuit of the touch panel device can detect the detection target.
  • the “resonance frequency” in the embodiment refers to a first electrode changeover switch (referred to as a drive electrode changeover switch or an X electrode changeover switch) or a second electrode from the connection point of the inductance element with the AC signal source.
  • a changeover switch referring to a detection electrode changeover switch, a Y electrode changeover switch, or the like.
  • the “frequency of the AC signal” in the embodiment may be different for each electrode. Thereby, the relationship between the resonance frequencies f0 and f1 of the respective electrodes can be easily changed so as to satisfy (Equation 7) or (Equation 9).
  • the AC signal When the frequency is f0 and the resonance frequency of one of the plurality of first electrodes and the plurality of second electrodes when the detection target touches the surface of the touch panel 100 is f1, the AC signal
  • the frequency fb satisfies the relationship of (Equation 9) can be applied to other than the mutual capacitance type touch panel device shown in the first to fifth embodiments. Specifically, even for the self-capacitance type touch panel device described in Embodiment 6, the advantageous effects obtained by the mutual capacitance type touch panel device can be obtained in the same manner.
  • FIG. 31 is a configuration diagram of the touch panel device 2001 according to the tenth embodiment.
  • the touch panel device 2001 further includes a variable capacitor 150 a electrically connected in series with the inductance element 111 between the AC signal source 110 and the drive electrode changeover switch 112.
  • the variable capacitor 150 a is connected in series between the AC signal source 110 and the inductance element 111.
  • the resonance frequency of each electrode X1 to X6 can be designed to be approximately the same value. Is possible. As a result, by fixing the frequency of the AC signal output from the AC signal source 110 in the vicinity of the resonance frequency, a large resonance current can be passed through each of the electrodes X1 to X6. Control of the capacitance value of the variable capacitor 150 a is performed by the control circuit 115.
  • the control circuit 115 confirms at least the connection state of the drive electrode changeover switch 112, recognizes the electrode electrically connected to the AC signal source 110 among the electrodes X1 to X6, and is electrically connected thereto.
  • the capacitance value of the variable capacitor 150a is adjusted to a desired value.
  • the capacitance value of the variable capacitor 150a required to shift the resonance frequency of each electrode to the vicinity of the frequency of the output signal of the AC signal source 110 is stored in the storage unit of the control circuit 115 in correspondence with each electrode. Also good.
  • only the switch TSW3 of the drive electrode selector switch 112 is electrically connected to the AC signal source 110 side, that is, only the electrode X3 of the electrodes X1 to X6 is electrically connected to the AC signal source 110. Yes.
  • the control circuit 115 reads the capacitance value corresponding to the electrode X3 recorded in the storage unit, and sends a control signal for adjusting the capacitance value of the variable capacitor 150a to the read capacitance value to the variable capacitor 150a.
  • the capacitance value of the variable capacitor 150a recorded in the storage unit is not only the value corresponding to the connection state of the drive electrode changeover switch 112 but also the combination of the connection state of the drive electrode changeover switch 112 and the detection electrode changeover switch 113.
  • the capacitance value may be set corresponding to In FIG.
  • the capacitance value of the variable capacitor 150a is set so that the resonance frequency of the plurality of electrodes is close to the frequency of the output signal of the AC signal source 110 in a state where the plurality of electrodes are electrically connected to the AC signal source 110. Adjusted. That is, the control circuit 115 holds the optimum capacitance value of the variable capacitor 150a corresponding to the combination of a plurality of electrodes selected from the electrodes X1 to X6 in the storage unit. As a result, a plurality of electrodes can be coupled to increase the conductivity of the electrode equivalently, and a resonance current can flow through the coupled electrodes, so that the sensitivity of the touch panel device 2001 can be remarkably improved. .
  • variable capacitor 150a is electrically connected in series between the AC signal source 110 and the inductance element 111.
  • the variable capacitor 150a is connected between the inductance element 111 and the drive electrode selector switch 112. May be electrically connected in series, and the same effect can be obtained.
  • the variable capacitor 150 a may be integrated with the control circuit 115. Further, the variable capacitor 150a may be formed by the same semiconductor process as the control circuit 115. As a result, a small and inexpensive touch panel device 2001 can be realized.
  • FIG. 32 is a configuration diagram of another touch panel device 2002 according to the tenth embodiment. 32, the same reference numerals are given to the same portions as those of the touch panel device 2001 shown in FIG.
  • a touch panel device 2002 shown in FIG. 32 includes a variable capacitor 150b instead of the variable capacitor 150a of the touch panel device 2001 shown in FIG.
  • the variable capacitor 150b is not electrically connected in series between the AC signal source 110 and the inductance element 111, and the AC signal source 110 and the inductance element 111 between the AC signal source 110 and the inductance element 111 are connected.
  • the connection point 1150b is electrically connected in series with the ground. Also in the touch panel device 2002 shown in FIG. 32, the same advantageous effect as that of the touch panel device 2001 in FIG.
  • 32 can be obtained by a combination of the inductance of the inductance element 111 and the capacitance value of the variable capacitor 150b. 32 is not a connection point 1150b between the inductance element 111 and the AC signal source 110 at one end of the variable capacitor 150b, but the inductance element 111 and the drive electrode changeover switch 112 between the inductance element 111 and the drive electrode changeover switch 112. Even when connected to the connection point 2150b to which are connected, the same advantageous effects as those of the touch panel device 2002 shown in FIG. 32 can be obtained.
  • FIG. 33 is a configuration diagram of still another touch panel device 2003 according to the tenth embodiment. 33, the same reference numerals are given to the same portions as those of the touch panel devices 2001 and 2002 shown in FIGS.
  • a touch panel device 2003 shown in FIG. 33 includes capacitors 142a to 142f having fixed capacitances instead of the variable capacitors 150a and 150b shown in FIGS.
  • the capacitors 142a to 142f used are connected in series between the electrodes X1 to X6 and the drive electrode changeover switch 112.
  • the resonance frequencies of the electrodes X1 to X6 can be designed to be substantially the same value.
  • the structure of the touch panel device 2003 can be simplified.
  • the electrodes X1 to X6 are electrically connected to the capacitors 142a to 142f, respectively.
  • At least one of the electrodes X1 to X6 may not be electrically connected to the capacitor. It is possible to resonate the electrode not connected to the capacitor to the frequency f1 by the inductance of the inductance element 111, and to resonate the other electrodes to the frequency f1 by connecting a capacitor in series with the drive electrode changeover switch 112. .
  • the capacitors 142a ⁇ 142f may be a variable capacitance capacitor instead of a fixed capacitor having a fixed capacitance value. In this case, by controlling the capacitance of the capacitor 142a ⁇ 142f by the control circuit 115, it is possible for resonating electrodes X1 ⁇ X6 at the frequency of the AC signal output from the AC signal source 110.
  • FIG. 34 is a configuration diagram of still another touch panel device 2004 according to the tenth embodiment. 34, the same reference numerals are given to the same portions as those of the touch panel device 2003 shown in FIG.
  • a touch panel device 2004 shown in FIG. 34 includes capacitors 143a to 143f instead of the capacitors 142a to 142f of the touch panel device 2003 shown in FIG.
  • the capacitors 143a to 143f are electrically connected between the connection points 1143a to 1143f where the drive electrodes X1 to X6 and the drive electrode changeover switch 112 are connected between the drive electrodes X1 to X6 and the drive electrode changeover switch 112, respectively, and the ground.
  • the same advantageous effect as that of the touch panel device 2003 shown in FIG. 33 can be obtained by combining the inductance of the inductance element 111 and the capacitance values of the capacitors 143a to 143f.
  • FIG. 35 is a block diagram of still another touch panel device 3006 according to the tenth embodiment. 35, the same reference numerals are assigned to the same portions as those of self-capacitance type touch panel device 6 in the sixth embodiment shown in FIG. 24A.
  • the touch panel device 3006 further includes variable capacitors 250a and 250b.
  • the variable capacitor 250a is electrically connected in series between the AC signal source 210a and the inductance element 211a, or between the inductance element 211a and the X electrode changeover switch 212a. That is, the variable capacitor 250a is electrically connected in series with the inductance element 211a between the AC signal source 210a and the X electrode changeover switch 212a.
  • variable capacitor 250b is electrically connected in series between the AC signal source 210b and the inductance element 211b, or between the inductance element 211b and the Y electrode changeover switch 212b. That is, the variable capacitor 250b is electrically connected in series with the inductance element 211b between the AC signal source 210b and the Y electrode changeover switch 212b.
  • the resonance frequency of each electrode is often different for each electrode. This is because the length of the transmission line between each electrode and the AC signal source is different, and also because each electrode has a different stray capacitance value. Therefore, when the frequency of the AC signal supplied from the AC signal source 110 to each electrode is made common at the same frequency, the resonance frequency of the electrode and the frequency of the AC signal are greatly different in a certain electrode, and a large resonance current flows. It also occurs when things are difficult.
  • the resonance frequency of each of the electrodes XS1 to XS6 is adjusted by adjusting the capacitance value of the variable capacitor 250a for each X electrode electrically connected to the AC signal source 210a. It is possible to design to approximately the same value. As a result, by fixing the frequency of the AC signal output from the AC signal source 210a to a frequency in the vicinity of the resonance frequency, a large resonance current can be passed through each electrode.
  • the control circuit 215 controls the capacitance value of the variable capacitor 250a.
  • the control circuit 215 confirms at least the connection state of the X electrode changeover switch 212a, recognizes the X electrode electrically connected to the AC signal source 210a among the plurality of X electrodes, and then sets the resonance frequency of the electrode. In order to shift to the vicinity of the frequency of the output signal of the AC signal source 210a, the capacitance value of the variable capacitor 250a is adjusted to a desired value. The capacitance value of the variable capacitor 250a necessary for shifting the resonance frequency of each electrode to the vicinity of the frequency of the output signal of the AC signal source 210a is stored in the storage unit of the control circuit 215 in a form corresponding to each electrode. May be.
  • the capacitance value of the variable capacitor 250a recorded in the storage unit is not only the value corresponding to the connection state of the X electrode changeover switch 212a, but also the combination of the connection state of the X electrode changeover switch 212a and the Y electrode changeover switch 212b.
  • a capacitance value may be set for.
  • two or more electrodes may be electrically connected to the AC signal source 210a at the same time.
  • the capacitance value of the variable capacitor 250a is set so that the resonance frequency of the plurality of electrodes is close to the frequency of the output signal of the AC signal source 210a in a state where the plurality of electrodes are electrically connected to the AC signal source 210a. Adjusted.
  • control circuit 215 may hold the optimum capacitance value of the variable capacitor 250a corresponding to the combination of a plurality of electrodes selected from the electrodes XS1 to XS6 in the storage unit.
  • the control circuit 215 may hold the optimum capacitance value of the variable capacitor 250a corresponding to the combination of a plurality of electrodes selected from the electrodes XS1 to XS6 in the storage unit.
  • the conductivity of the electrodes is equivalently increased, and a resonance current can flow through the combined electrodes. Therefore, the sensitivity of the touch panel device 3006 can be significantly improved.
  • the variable capacitor 250b operates in the same manner as the variable capacitor 250a with respect to the Y electrodes YS1 to YS2, and the same effect is obtained.
  • variable capacitor 250a is electrically connected in series between the AC signal source 210a and the inductance element 211a, but the variable capacitor 250a is connected between the inductance element 211a and the X electrode changeover switch 212a. Even if they are electrically connected in series, the same effect can be obtained.
  • variable capacitor 250b is electrically connected in series between the AC signal source 210b and the inductance element 211b, but the variable capacitor 250b is connected between the inductance element 211b and the Y electrode changeover switch 212b. Even if they are electrically connected in series, the same effect can be obtained.
  • variable capacitors 250a and 250b may be integrated with the control circuit 215. Furthermore, at least one of the variable capacitors 250a and 250b may be formed by the same semiconductor process as the control circuit 215. Thereby, a small and inexpensive touch panel device 3006 can be realized.
  • touch panel device 3006 may not include one of the variable capacitors 250a and 250b.
  • FIG. 36 is a block diagram of still another touch panel device 3007 according to the tenth embodiment. 36, the same reference numerals are given to the same portions as those of the touch panel device 3006 shown in FIG.
  • a touch panel device 3007 shown in FIG. 36 includes variable capacitors 250c and 250d instead of the variable capacitors 250a and 250b of the touch panel device 3006 shown in FIG.
  • the variable capacitor 250c is electrically connected in series between a connection point 1250c between the AC signal source 210a and the inductance element 211a where the AC signal source 210a and the inductance element 211a are connected, and the ground.
  • the variable capacitor 250d is electrically connected in series between a connection point 1250d between the AC signal source 210b and the inductance element 211b, where the AC signal source 210b and the inductance element 211b are connected, and the ground.
  • the touch panel device 3007 shown in FIG. 36 has a combination of the inductance of the inductance element 211a and the capacitance value of the variable capacitor 250c, and the combination of the inductance value of the inductance element 211b and the capacitance value of the variable capacitor 250d.
  • the same advantageous effect as 3006 can be obtained.
  • variable capacitor 250c is electrically connected not between the connection point 1250c but between the connection point 2250c between the inductance element 211a and the X electrode changeover switch 212a and the X electrode changeover switch 212a and the ground. Even when connected in series, the same advantageous effects as those of the touch panel device 3007 shown in FIG. 36 can be obtained.
  • variable capacitor 250d is not at the connection point 1250d, but between the connection point 2250d between the inductance element 211b and the Y electrode changeover switch 212b and the connection point 2250d and the ground. Even if they are electrically connected in series, the same advantageous effects as those of the touch panel device 3007 shown in FIG. 36 can be obtained.
  • FIG. 37 is a block diagram of still another touch panel device 3008 according to the tenth embodiment. 37, the same reference numerals are given to the same portions as those of the touch panel devices 3006 and 3007 shown in FIGS.
  • a touch panel device 3008 shown in FIG. 37 includes capacitors 242a to 242l having fixed capacitances instead of the variable capacitors 250a to 250d shown in FIGS.
  • the capacitors 242a to 242f are electrically connected in series between each of the electrodes XS1 to XS6 and the X electrode changeover switch 212a.
  • the capacitors 242g to 242l are electrically connected in series between each of the electrodes YS1 to YS6 and the Y electrode changeover switch 212b.
  • the resonant frequencies of the electrodes XS1 to XS6 can be designed to be substantially the same value.
  • the capacitance values of the capacitors 242g to 242l for each of the Y electrodes YS1 to YS6 can be designed to be substantially the same value.
  • the touch panel device 3008 does not need to control the capacitance value of the capacitor by the control circuit 215, the structure can be simplified.
  • the electrodes XS1 to XS6 and YS1 to YS6 are electrically connected to the capacitors 242a to 242f and 242g to 242l, respectively, but at least one of the electrodes XS1 to XS6 and YS1 to YS6 is used.
  • the capacitor does not have to be electrically connected to the electrode.
  • resonance is caused, for example, at the frequency f1 by the inductance of the inductance element 211a or the inductance of the inductance element 211b.
  • a capacitor is provided between the X electrode changeover switch 212a or the Y electrode changeover switch 212b. By connecting in series, it is possible to resonate at the frequency f1.
  • the capacitors 242a to 242l may be variable capacitors.
  • the control circuit 215 controls the capacitance values of the variable capacitors 242a to 242l so that the electrodes can resonate at the frequency of the AC signal output from the AC signal sources 210a and 210b.
  • FIG. 38 is a configuration diagram of the touch panel device 3009 according to the tenth embodiment.
  • the same reference numerals are given to the same portions as those of the touch panel device 3008 shown in FIG.
  • a touch panel device 3009 shown in FIG. 38 includes capacitors 243a to 243l instead of the capacitors 242a to 242l of the touch panel device 3008 shown in FIG.
  • Capacitors 243a to 243f are respectively connected to connection points 1243a to 1243f between the X electrodes XS1 to XS6 and the X electrode changeover switch 212a between the X electrodes XS1 to XS6 and the X electrode changeover switch 212a and the ground. They are electrically connected in series.
  • Capacitors 243g to 243l are respectively connected to connection points 1243g to 1243l where the Y electrodes YS1 to YS6 and the Y electrode changeover switch 212b are connected between the Y electrodes YS1 to YS6 and the Y electrode changeover switch 212b, respectively. They are electrically connected in series.
  • the combinations of the capacitance values of the capacitors 243a to 243f and the inductance of the inductance element 211a, and the combinations of the capacitance values of the capacitors 243g to 243l and the inductance of the inductance element 211b are shown in FIG. Advantageous effects similar to those of the touch panel device 3008 can be obtained.
  • the reactance element such as a capacitor is connected between the electrode and the AC signal source, thereby varying the resonance frequency of each electrode.
  • the variation in the resonance frequency of each electrode may be reduced depending on the structure of the touch panel device. For example, it is possible to reduce the variation in the value of the stray capacitance between each electrode of the touch panel 100, 200 and the ground, or to reduce the variation in the electrical length from the AC signal source to each electrode, thereby resonating each electrode. Frequency variations can be suppressed.
  • the “resonance frequency” refers to a first electrode changeover switch (referring to a drive electrode changeover switch or an X electrode changeover switch) or a second electrode changeover switch (detection) from the connection point of the inductance element with the AC signal source. This indicates the frequency at which the imaginary component is 0 in the impedance characteristic when the target electrode is viewed via the electrode changeover switch, the Y electrode changeover switch, or the like.
  • a noise removal filter is provided at the input stage of the detection circuit. The filter has a pass band that can substantially pass the frequency of the AC signal output from the AC signal source.
  • a variable capacitor 150a that is selected according to the state of the drive electrode switch 112 or the detection electrode switch 113.
  • the capacitance values 150b and 250a to 250d are recorded in advance in the storage unit of the control circuit 115 before use, but are not limited to such a configuration.
  • a capacitance value required for the control circuit 115 to resonate for each electrode may be measured and recorded in the storage unit.
  • the inductance element is electrically connected in series between the AC signal source and the electrode.
  • the present invention is not limited to this, and the connection point between the AC signal source and the electrode. Even if they are electrically connected in series between the ground and the ground, the same effect is obtained.
  • the AC signal source 110 of the touch panel device 1 varies the frequency of the AC signal input to at least two of the plurality of first electrodes X1 to X6.
  • the “resonance frequency” refers to a first electrode changeover switch (referring to a drive electrode changeover switch or an X electrode changeover switch) or a second electrode changeover switch (detection) from the connection point of the inductance element with the AC signal source.
  • a filter for removing noise is provided at the input stage of the detection circuit, and this filter has a pass band that can pass substantially the frequency of the AC signal.
  • the drive electrode changeover switch 112 electrically connects each of the electrodes X1 to X6 and the AC signal source 110 sequentially, the electrical length of the signal line from the AC signal source 110 to the electrode X1. Is longer than the electrical length of the signal line from the AC signal source 110 to the electrode X6.
  • the resonance frequency of each electrode also changes depending on the electrical length of the signal line from the AC signal source 110 to each electrode, and the resonance frequency of the electrode X1 is lower than the resonance frequency of the electrode X6. In this state, when the frequency of the AC signal output from the AC signal source 110 is the same as the resonance frequency of the electrode X1, the resonance frequency of the electrode X6 may be greatly different from the frequency of the AC signal.
  • the frequency of the AC signal input to electrode X1 is different from the frequency of the AC signal input to electrode X6.
  • the frequency of the AC signal input to the electrode X1 is the same as the resonance frequency of the electrode X1
  • the frequency of the AC signal input to the electrode X6 is the same as the resonance frequency of the electrode X6.
  • touch panel device 1 can avoid a situation in which the detection sensitivity of electrode X6 is significantly deteriorated relative to the detection sensitivity of electrode X1.
  • the frequency of the AC signal input to each electrode is the same as the resonance frequency of each electrode.
  • the frequency of the AC signal input to each electrode is not limited to this, and is the frequency around the resonance frequency of each electrode. If there is no problem.
  • the frequencies of the AC signals input to the electrodes X1 and X6 are different from each other.
  • the frequencies of the AC signals input to the other two electrodes or three or more electrodes may be different from each other. The effect is obtained.
  • Differentiating the frequency of the AC signal depending on the input electrodes can be applied not only to the mutual capacitance type touch panel device in the first to fifth embodiments but also to the self-capacitance type touch panel device in the sixth embodiment.
  • the same effect can be obtained by making the frequencies of the AC signals input to at least two of the plurality of first electrodes and the plurality of second electrodes different from each other.
  • the AC signal source 110 is used when the frequency of the AC signal input to at least two of the plurality of first electrodes (electrodes X1 to X6) is different. May switch the frequency of the AC signal input to one of the plurality of first electrodes in terms of time.
  • alternating current is input to at least two of the plurality of first electrodes (electrodes XS1 to XS6) and the plurality of second electrodes (electrodes YS1 to YS6).
  • the AC signal sources 110a and 110b may switch the frequency of the AC signal input to one of the plurality of first electrodes and the plurality of second electrodes in terms of time. good.
  • the resonance frequency of the electrode may change.
  • the resonance frequency of the electrode and the frequency of the AC signal input to the electrode may be greatly different.
  • a touch panel device with high detection sensitivity can be realized by selecting an appropriate AC signal frequency according to environmental changes.
  • the AC signal source may change the frequency of the AC signal in consideration of the change amount.
  • the touch panel device may further include an environmental sensor 901 such as a temperature sensor for detecting an ambient environment of the touch panel device.
  • an environmental sensor 901 such as a temperature sensor for detecting an ambient environment of the touch panel device.
  • the frequency of the AC signal is determined based on the output value from the environment sensor 901.
  • the frequency of the AC signal can be determined based on the output value from the environment sensor 901.
  • the AC signal source 110 may detect the resonance frequency of at least one of the plurality of first electrodes X1 to X6 and determine the frequency of the AC signal based on the detected resonance frequency.
  • the AC signal sources 110a and 110b detect the resonance frequency of at least one of the plurality of first electrodes XS1 to XS6 and the plurality of second electrodes YS1 to YS6, and based on the detected resonance frequency. Alternatively, the frequency of the AC signal may be determined.
  • the AC power supply 110 (110a, 110b, 210a, 210b), for example, changes the frequency of the AC signal input to each electrode, and the voltage value detected by the detection circuit 114 (114a, 114b, 214a, 214b) is the highest.
  • the increasing frequency can be detected as the resonance frequency of the electrode.
  • the AC signal source 110 may detect the resonance frequency of each electrode when the touch panel device is activated, and may repeat detection of the resonance frequency every predetermined period after the activation of the touch panel device.
  • the AC signal source 110 detects the resonance frequency of each electrode every predetermined period after activation, so that even if the resonance frequency of each electrode fluctuates with time, an appropriate AC signal frequency is set as needed. It is possible to select and input to each electrode. When determining the frequency of the AC signal input to each electrode based on the detected resonance frequency of each electrode, for example, the frequency of the AC signal is selected to be the same as or around the resonance frequency of each electrode.
  • the resonance frequency of each electrode is measured at the time of manufacturing the touch panel device, and the measured resonance frequency is stored in the control circuit 115.
  • the AC power supply 110 (110a, 110b) is based on the recorded resonance frequency. You may determine the frequency of the alternating current signal input into each electrode.
  • a sine wave signal may be used as the AC signal.
  • the resonance frequency of each electrode may vary, generally, a signal having a wideband frequency component such as a rectangular wave is used as an AC signal.
  • a rectangular wave signal may be used as the AC signal. Since a circuit for generating a rectangular wave signal is simpler than a sine wave signal, the circuit scale of the AC signal source can be reduced.
  • the touch panel device according to the present invention is widely applicable to touch panel devices used for portable terminals, personal computers, ATM terminals, and the like.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)

Abstract

L'invention concerne un dispositif de panneau tactile qui comporte les éléments suivants : un panneau tactile qui a des premières et secondes électrodes; une source de signal en courant alternatif (CA) qui entre un signal CA dans les premières électrodes; un élément d'inductance connecté électriquement en série entre la source de signal CA et les premières électrodes; et un circuit de détection qui utilise des changements dans les signaux émis à partir des secondes électrodes, au moins pour détecter des changements de capacité entre les premières et secondes électrodes lorsqu'un objet donné touche le panneau tactile. Ce dispositif de panneau tactile permet d'augmenter la sensibilité de détection avec une architecture simple.
PCT/JP2012/007182 2011-11-11 2012-11-08 Dispositif de panneau tactile WO2013069290A1 (fr)

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CN104503627A (zh) * 2015-01-14 2015-04-08 京东方科技集团股份有限公司 触控结构、触控显示面板和触控显示装置
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KR20160092594A (ko) * 2015-01-27 2016-08-05 삼성디스플레이 주식회사 터치 표시 장치 및 그 구동 방법
KR102302139B1 (ko) 2015-01-27 2021-09-14 삼성디스플레이 주식회사 터치 표시 장치 및 그 구동 방법
JP2017091490A (ja) * 2015-11-10 2017-05-25 ハイマックス テクノロジーズ リミテッド インセル型タッチ表示パネル
CN106775037A (zh) * 2015-11-20 2017-05-31 奇景光电股份有限公司 内嵌式触控显示面板
JP2019125015A (ja) * 2018-01-12 2019-07-25 Ｔｉａｎｍａ Ｊａｐａｎ株式会社 容量検出回路及び静電容量センサ装置
JP7011159B2 (ja) 2018-01-12 2022-01-26 Ｔｉａｎｍａ Ｊａｐａｎ株式会社 容量検出回路及び静電容量センサ装置
US10901558B2 (en) 2018-06-21 2021-01-26 International Business Machines Corporation Highly sensitive capacitive touch with resonant coupling
CN112805667A (zh) * 2018-11-27 2021-05-14 阿尔卑斯阿尔派株式会社 具有斜交检测电极组的接近检测装置

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