WO2013069290A1 - Touch-panel device - Google Patents

Touch-panel device

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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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WO
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Patent type
Prior art keywords
electrode
electrodes
plurality
touch panel
ac signal
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PCT/JP2012/007182
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French (fr)
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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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means

Abstract

This touch-panel device is provided with the following: a touch panel that has first and second electrodes; an AC signal source that inputs an AC signal to the first electrodes; an inductance element electrically connected in series between the AC signal source and the first electrodes; and a detection circuit that uses changes in signals outputted from the second electrodes, at least, to detect changes in capacitance between the first and second electrodes when a given object touches the touch panel. This touch-panel device makes it possible to increase detection sensitivity with a simple architecture.

Description

Touch panel device

The present invention relates to a touch panel device of capacitive type.

Recently, portable terminals, personal computers, bank ATM (Automatic Teller Machine) touch panel device of the image displayed on the display in such a terminal to input necessary information by touching a finger has become widespread. The touch panel device, it is necessary to detect the position of the detection object, such as a touched finger to the surface in high precision high sensitivity.

The detection method of the touch panel, the resistive film type, an electrostatic capacitance method is known. The touch panel device of the capacitive type, as compared to the resistive film type, its life is excellent in terms of responsiveness and detection accuracy is widely used. The touch panel device of the capacitive type monitors changes in capacitance when the detection object is in contact with the surface of the touch panel device, detecting a touch position.

Patent Document 1 discloses a touch panel device electrically coupled, to increase the detection sensitivity by increasing the capacitance variations to detect a plurality of detection electrodes of the touch panel.

However, the position detection accuracy and electrically coupled to the plurality of detection electrodes is reduced.

JP 2008-153025 JP

The touch panel device includes a touch panel having a first and second electrode, and an AC signal source for inputting the AC signal to the first electrode, are electrically connected in series between the AC signal source and the first electrode an inductance element, a detection circuit for detecting object is detected by a change in signal output from at least the second electrode a change in capacitance between the first electrode and the second electrode at the time of touching the touch panel provided with a door.

The touch panel device can increase the detection sensitivity by a simple configuration.

Figure 1 is a schematic cross-sectional view of a touch panel of a touch panel device of the first embodiment. Figure 2A is a cross-sectional schematic diagram illustrating the operation principle of mutual capacitance type touch panel device. Figure 2B is an equivalent circuit diagram of the touch panel device shown in Figure 2A. Figure 2C is an equivalent circuit diagram of the touch panel device shown in Figure 2A. Figure 2D is a diagram showing a waveform of the voltage of the electrode of the touch panel device shown in Figure 2A. Figure 2E is a diagram showing a waveform of the voltage of the electrode of the touch panel device shown in Figure 2A. Figure 3 is a block diagram of a touch panel device of the first embodiment. Figure 4 is a timing chart showing the switching control signal of a touch panel device of the first embodiment. Figure 5A is a configuration diagram of a touch panel device of the first embodiment. Figure 5B is an equivalent circuit diagram of the touch panel device shown in FIG. 5A. Figure 6A is a cross-sectional schematic view of a touch panel device of the comparative example. Figure 6B is a cross-sectional schematic view of a touch panel device of the first embodiment. Figure 7A is a block diagram of another touch panel device of the first embodiment. Figure 7B is a block diagram of yet another touch panel device of the first embodiment. Figure 8 is a block diagram of yet another touch panel device of the first embodiment. Figure 9 is a configuration diagram of a touch panel apparatus in the second embodiment. Figure 10 is a block diagram of a first modification of the touch panel device according to the second embodiment. Figure 11 is a block diagram of a second modification of the touch panel device according to the second embodiment. Figure 12 is a block diagram of a third modification of the touch panel apparatus in the second embodiment. Figure 13 is a block diagram of a fourth modification of the touch panel device of the second embodiment. Figure 14 is a block diagram of a fifth modification of the touch panel apparatus in the second embodiment. Figure 15A is a block diagram of a sixth modification of the touch panel apparatus in the second embodiment. Figure 15B is a block diagram of a seventh modification of the touch panel apparatus in the second embodiment. Figure 16 is a structural view of a touch panel device according to the third embodiment. Figure 17 is a block diagram of a touch panel device shown in FIG. 16. Figure 18 is a block diagram of another touch panel device in the third embodiment. Figure 19 is a block diagram of a touch panel device shown in FIG. 18. Figure 20A is a cross-sectional schematic view of a touch panel device of the fourth embodiment. Figure 20B is a diagram showing a waveform of a signal of a touch panel device of the fourth embodiment. Figure 20C is a schematic sectional view of another touch panel device of the fourth embodiment. Figure 21 is a structural view of a touch panel device in the fifth embodiment. Figure 22 is a cross-sectional schematic view of a touch panel device according to the sixth embodiment. Figure 23A is a schematic cross-sectional view illustrating the operating principle of the self-capacitance type touch panel device. Figure 23B is an equivalent circuit diagram of the touch panel device shown in Figure 2A. Figure 23C is a diagram showing a waveform of the voltage of the electrode of the touch panel device shown in Figure 2A. Figure 23D is a diagram showing a waveform of the voltage of the electrode of the touch panel device shown in Figure 2A. Figure 24A is a configuration diagram of a touch panel device according to the sixth embodiment. Figure 24B is a block diagram of another touch panel device according to the sixth embodiment. Figure 25A is a cross-sectional schematic view of a touch panel device according to the seventh embodiment. Figure 25B is a schematic sectional view of another touch panel device according to the seventh embodiment. Figure 26 is a configuration diagram of a touch panel of a touch panel device according to the eighth embodiment. Figure 27 is a configuration diagram of a touch panel of another touch panel device according to the eighth embodiment. Figure 28 is a configuration diagram of a touch panel device according to the ninth embodiment. Figure 29A is a graph showing the frequency characteristic of the signal propagating in the electrodes of a touch panel device according to the first to fifth embodiments. Figure 29B is a graph showing the frequency characteristic of the signal propagating in the electrodes of the touch panel device of the comparative example. Figure 30A is a graph showing the frequency characteristic of the signal propagating in the electrodes of a touch panel device according to the first to fifth embodiments. Figure 30B is a graph showing the frequency characteristic of the signal propagating in the electrodes of the touch panel device of the comparative example. Figure 31 is a block diagram of a touch panel device according to the tenth embodiment. Figure 32 is a block diagram of another touch panel device according to the tenth embodiment. Figure 33 is a block diagram of yet another touch panel device according to the tenth embodiment. Figure 34 is a block diagram of yet another touch panel device according to the tenth embodiment. Figure 35 is a block diagram of yet another touch panel device according to the tenth embodiment. Figure 36 is a block diagram of yet another touch panel device according to the tenth embodiment. Figure 37 is a block diagram of yet another touch panel device according to the tenth embodiment. Figure 38 is a block diagram of yet another touch panel device according to the tenth embodiment.

The touch panel device of the capacitive type detects a capacitance variation of the transparent electrodes facing in a grid across the insulating layer such as a dielectric. The touch panel device of an electrostatic capacitance method, a self-capacitance type for detecting a change (capacitance between the electrodes and the ground) the electrode itself of the electrostatic capacitance, the mutual capacitance type for detecting a capacitance change between opposed electrodes there are two types. The touch panel device of the embodiment described below are applicable to the touch panel device of the self-capacitance type and mutual capacitive both schemes.

(Embodiment 1)
Figure 1 is a schematic cross-sectional view of the touch panel 100 mounted to the touch panel device 1 in 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 device is an image display element (hereinafter, LCD hereinafter) 107 and the electrode layer 108 and the glass layer 105 shielding layer 106 and the protective layer 101. An electrode layer 108 and the glass layer 105 and the shield layer 106 protective layer 101 is transparent. LCD107 and the electrode layer 108 are oppositely arranged with the glass layer 105 and the shield layer 106. The upper electrode layer 108 detection object such as the finger of the operator touches (surface side) is covered and protected by the protective layer 101. Electrode layer 108 includes a drive electrode 104, the glass layer 103 is an insulating layer, and a detection electrode 102 that faces the driving electrode 104 sandwiching the glass layer 103. Drive electrodes 104 and the detection electrode 102 is formed by arranging in a grid pattern in a direction orthogonal to the transparent electrode such as ITO (Indium Tin Oxide) with each other. The driving electrodes 104, the AC signal is input and output from the detection electrode 102. Detecting a change in capacitance between the driving electrodes 104 and the detection electrode 102 by detecting the AC signal. When there is a change in capacitance, it can be seen that the detection object such as a finger touches the touch panel 100. Transparent shielding layer 106 is connected to ground, and prevents the noise generated when driving the LCD107 is jumped to the driving electrode 104 and detecting electrode 102, the touch panel 100 to malfunction. Also, LCD board having LCD107 is connected to ground. Hereinafter referred to as the panel ground collectively shielding layer 106 and the LCD board. Note that the shield layer 106 is not an essential configuration in the touch panel device of the embodiment.

2A is a schematic sectional view for explaining the operation principle of the touch panel device 1 of the mutual capacitance type, an enlarged view of the electrode layer 108. Figure 2B is an equivalent circuit diagram of the touch panel device 1 in a state where the detection object F is not touched in the operator's finger or the like on the touch panel 100. Figure 2C is an equivalent circuit diagram of the touch panel device 1 in a state where the detection object F has touched the touch panel 100. Figure 2D shows the waveform of the driving voltage Vs is an AC signal applied to the drive electrodes 104. Figure 2E shows a waveform of the detection voltage Vd is an AC signal detected from the detection electrode 102. In the equivalent circuit diagram shown in FIG. 2B and FIG. 2C, as the understanding of the operation principle of the touch panel device 1 of the mutual displacement is facilitated, stray capacitance and the driving electrode 104 and the ground between the detection electrode 102 and the ground the stray capacitance or the like between the not taken into consideration. As shown in FIG. 2A, the drive electrode 104 and the detection electrode 102 is coupling capacitance Ce is present between the detection electrode 102 and the driving electrode 104 is at the intersection intersecting with the insulating layer 103. When the drive voltage Vs of the AC signal to the drive electrode 104 is applied, an AC signal current i1 flows in the detection electrode 102 through a coupling capacitor Ce, is converted into the detection voltage Vd by the resistor R.

In a state where the detection object F is not touching the touch panel 100, as shown in Figure 2B, all the alternating signal currents i1 flows in resistor R, the detection voltage Vd1 is generated in the resistor R.

On the other hand, the detection object F is in the state where the touch panel 100, so that the capacitance Cf in parallel with the coupling capacitor Ce between the detection electrode 102 and the detection object F is connected. At this time, part of the accumulated in the coupling capacitance Ce charge escapes to the ground through a capacitance Cf. Accordingly, as shown in Figure 2C, a portion of the AC signal current i1 (current i3) flows to the electrostatic capacitance Cf, the current i2 flowing through the resistor R is reduced from the current i1. Therefore, the detection voltage Vd2 generated in the resistor R becomes smaller than the detection voltage Vd1 when the detection object F is not touched. Therefore, by setting the predetermined threshold voltage Vth between the detection voltage Vd1 detection voltage Vd2, compares the detection voltage Vd and threshold voltage Vth detection circuit 114 to be described later. If when the detected voltage Vd is greater than the threshold voltage Vth, it is determined that the detection object F is not touched, when the detection voltage Vd to the contrary smaller than the threshold voltage Vth, the detection object F is touched determines that the.

Figure 3 is a block diagram of a touch panel device 1 in the first embodiment. The touch panel device 1 includes a touch panel 100, the AC signal source 110, a drive electrode switching switch 112, and the detection electrode switching switch 113, a detection circuit 114, a control circuit 115. The inductance element 111 as a matching element is connected in series between the AC signal source 110 and the driving electrode changeover switch 112.

In FIG. 3, X-axis in the longitudinal direction of the touch panel 100, a direction orthogonal to the X-axis and Y-axis. The touch panel 100 is arranged at substantially equal intervals in the X-axis direction (first direction), a plurality of drive electrodes 104 extending in the Y-axis direction (second direction) (first electrode), Y-axis direction to be arranged at substantially equal intervals, and a plurality of detection electrodes 102 extending in the X-axis direction (the second electrode). In this embodiment in order to simplify the description, the driving electrode 104 is composed of six drive electrodes X1 ~ X6, the detection electrode 102 is assumed to be composed of six detection electrodes Y1 ~ Y6. The drive electrodes X1 ~ X6 and the detection electrodes Y1 ~ Y6 are arranged in a grid pattern so as each other are orthogonal.

AC signal source 110, for example, generates an AC signal of a frequency of about 1.0 MHz ~ 1.5 MHz. Drive electrode switching switch 112 (first electrode changeover switch) consists switches TSW1 ~ TSW6 which are electrically connected to each of the drive electrodes X1 ~ X6, the inductance element 111 electrically connected to the driving electrode Xm ( m along with selecting an integer) satisfying 1 ≦ m ≦ 6, to connect the other driving electrodes that are not selected to the ground. That is, the driving electrode switching switch 112 has one terminal electrically connected to the drive electrodes X1 ~ X6, the other terminal is the inductance element 111 and electrically connected. The drive electrode switching switch 112 switches the connection state between the drive electrodes X1 ~ X6 and the inductance element 111 between the open and the short-circuit state. Drive electrodes in an open state is connected to the ground.

For example, in FIG. 3, when the drive electrodes X3 is selected, the driving electrodes X1 that has not been selected, X2, X4, X5, X6 is connected to the ground. AC signal source 110 inputs the AC signal via the inductance element 111 to the driving electrodes X3 selected by the drive electrode switching switch 112. Thus, the drive electrode X3 and the inductance element 111 when switched to a short-circuited state, the driving electrodes X1 became open, X2, X4, X5, X6 is to be connected to the ground.

Detecting electrode switching switch 113 (second electrode changeover switch) consists respectively electrically the attached switches RSW1 ~ RSW6 detection electrodes Y1 ~ Y6, detection circuit 114 electrically connected to the detection electrode Yn ( n along with selecting an integer) satisfying 1 ≦ n ≦ 6, to connect the other detection electrodes that are not selected to the ground. That is, one terminal of the detecting electrode switching switch 113 is detected at the electrodes Y1 ~ Y6 are electrically connected, the other terminal is input electrically connected to the detection circuit 114. Then, it switches the connection state between the detection circuit 114 and the detection electrodes Y1 ~ Y6 between an open state and the short-circuit state. Detection electrodes in an open state is connected to the ground.

For example, in FIG. 3, when the detection electrode Y3 is selected, the detection electrodes Y1 that has not been selected, Y2, Y4, Y5, Y6 is connected to the ground. Thus, when the detection electrode Y3 and the detection circuit 114 is switched to a short-circuited state, the detection electrodes Y1 became open, Y2, Y4, Y5, Y6 is to be connected to ground.

In the above description, a driving electrode in an open state with respect to the AC signal source 110, to connect the detection electrodes in an open state with respect to the detection circuit 114 to ground, a short circuit to the AC signal source 110 a drive electrode in a state, in order to reduce the influence of noise generated when driving the LCD107 for the detection electrode was short-circuited to the detection circuit 114. With this configuration, even configuration in which the shield layer 106 of FIG. 1, it is possible to reduce the influence of noise generated when driving the LCD 107. The drive electrodes was opened to the AC signal source 110, and need not necessarily be connected to the ground detection electrode in an open state with respect to the detection circuit 114. Whether to connect was opened electrode to the ground, the amount and the noise LCD107 occurs, depending on whether the shield layer 106 is arranged, as appropriate, it may be determined.

The control circuit 115 outputs a switching control signal SEL1 to the drive electrode switching switch 112, controls the switching of the switches TSW1 ~ TSW6. Similarly, the control circuit 115 outputs a switching control signal SEL2 to the detection electrode switching switch 113, controls the switching of the switches RSW1 ~ RSW6.

Detection circuit 114 generates a detection voltage Vd from an AC signal output from the selected by the detection electrode switching switch 113 (became detection circuit 114 a short circuit state) detection electrodes Yn (1 ≦ n ≦ 6), the threshold value by comparing the voltage Vth, the detection object F to detect whether or not touching the touch panel 100.

In the following description, the driving electrode switching switch, the detecting electrode switching switch, the AC signal source, an inductance element, between the such detection circuit that the electrode serving as a short-circuit state is referred to as "selected electrode or selection electrode", that of the opened electrode may be referred to as "electrode or non-selective electrodes that are not selected."

Next, the principle of detecting a touch position on the touch panel 100. Figure 4 is a timing chart showing the switching timing of the switching control signal SEL2 for controlling the respective switches RSW1 ~ RSW6 switching control signals SEL1, and the detection electrode switching switch 113 controls the switches TSW1 ~ TSW6 drive electrode switching switch 112 is there.

4, the switching control signal SEL1 of the switches TSW1 ~ TSW6 is in the period of the high level "H" (Td), the driving electrodes X1 ~ X6 is connected to an AC signal source 110 via the inductance element 111, the switching control signal SEL1 There is a period of low level "L" driving electrodes X1 ~ X6 is connected to the ground. Similarly, in the period the switching control signal SEL2 is high level "H" of the switches RSW1 ~ RSW6 (Ts), the detection electrodes Y1 ~ Y6 are connected to the detection circuit 114, a period switching control signal SEL2 is at the low level "L" the detection electrodes Y1 ~ Y6 are connected to ground.

As shown in FIG. 4, the drive electrode switching switch 112 scans to sequentially select the drive electrodes X1 ~ X6 connecting to an AC signal source 110 at a predetermined time interval Td. To a particular drive electrode Xm (1 ≦ m ≦ 6) is (the period being input AC signal) period is connected to the AC signal source 110, the detection electrode switching switch 113, all the detection electrodes Y1 ~ Y6 the scanned to sequentially select at a constant time interval Ts, and outputs the AC signal to the detection circuit 114 from the selected detection electrodes Yn (1 ≦ n ≦ 6). When the selection of the drive electrodes X6 is completed, repeat the scan returns to the first drive electrode X1. Drive electrodes X1 ~ X6, the detection electrodes Y1 ~ Y6 is all scan ending at frame time Tf, proceeds to scan the next frame. The scanning operation is sequentially repeated by the control of the control circuit 115.

Since the speed of scanning of the frame is sufficiently faster than the movement of the detection target F (frame time Tf sufficiently small), the touch position detection object F, is detected at intervals accuracy of intersection of the drive electrode and the detection electrode be able to. Detection circuit 114 includes a switch control signal SEL1, SEL2 is input from the control circuit 115, the comparison result between the detection voltage Vd and threshold voltage Vth, to detect the position on the touch panel 100 detects the object F has touched.

For example, in FIG. 3, if the detection object F to the position detection electrode Y3 and the driving electrodes X3 on the touch panel 100 intersect has touched, the switching control signal SEL1 of the switch TSW3 is high level "H", the switching of the switch RSW3 at the timing of the control signal SEL2 is a high level "H" (timing Tp in Fig. 4), the detection circuit 114 will detect a small detection voltage Vd than the threshold voltage Vth.

In other words, the driving electrodes X3 is connected to an AC signal source 110, and, in the detection electrode Y3 is connected to the detection circuit 114 timing detection circuit 114 will detect a touch of a detection target object F.

In the touch panel device 1 of the present embodiment, the inductance element 111 is connected between an AC signal source 110 and the driving electrodes X1 ~ X6. Describing the effect of the inductance element 111 below. Figure 5A is a configuration view of the area detection object F of the touch panel device 1 shown in FIG. 3 is touching. Figure 5B is an equivalent circuit diagram of a transmission path from the AC signal source 110 to the detection circuit 114.

In the touch panel device 1, when the driving electrodes X3 and detection electrode Y3 is selected respectively, the AC signal source 110, an inductance element 111, an input terminal P1 of the driving electrodes X3, intersection P33 of the driving electrodes X3 and the detection electrode Y3, the detection electrode Y3 transmission line 117 to AC signal current reaches the detection circuit 114 via the output terminal P3 of the flow is formed.

From the input terminal P1 of the driving electrodes X3 to the intersection P33 of the driving electrodes X3 and the detecting electrode Y3 is present the resistance Rd, the from the intersection P33 to the output end P3 of the sensing electrodes Y3 resistor Rs are present.

The drive electrodes X2, X4 adjacent to the drive electrode X3 is connected to the ground. Therefore, the driving electrode X3 is between the driving electrodes X2, X4, stray capacitance Cs1, Cs2 exists, respectively. Furthermore, there is a stray capacitance Cs3 between the drive electrode X3 and the panel ground.

Similarly, detection electrodes Y2, Y4 adjacent to the detection electrode Y3 is connected to the ground. Therefore, between the detecting electrode Y3 and the detection electrode Y2, Y4, there is a stray capacitance Cs4 and Cs5. Furthermore, there is a stray capacitance Cs6 between the detection electrode Y3 and the panel ground.

As shown in Figure 5B, the inductance L of the inductance element 111 to the transmission line 117, the stray capacitance of the driving electrodes X3 Csd (= Cs1 + Cs2 + Cs3), determined by the stray capacitance of the coupling capacitor Ce and detection electrodes Y3 Css (= Cs4 + Cs5 + Cs6) static series resonance circuit is formed by a capacitance. Here, the value of the coupling capacitance Ce, since stray capacitance Csd, sufficiently small compared to the value of Css, the resonant frequency fres of the series resonance circuit is expressed by equation (1).

Figure JPOXMLDOC01-appb-M000001

Here, the stray capacitance Csd is determined by such as the distance to the width of the driving electrodes X3, neighboring driving electrodes X2, X4 and panel ground, shield layer 106 and the like. Thus, by electrically connecting between the inductance element 111 and the driving electrode and the AC signal source 110, it is possible to resonate the driving electrodes at the frequency of the AC signal, the amplitude of the AC signal flowing through the driving electrodes the value can be increased. As a result, the electric field strength and magnetic field strength of the driving electrodes near can enhance, it is possible to improve the sensitivity of the touch panel 100.

General information terminals (e.g., a smart phone, a tablet PC, etc.) in a touch panel mounted on, if not electrically connected to the inductance element 111 is provided between the AC signal source 110 and the driving electrodes, the resonance of the driving electrodes frequency becomes the number 10MHz or more of high frequency. On the other hand, the frequency of the AC signal output from the AC signal source 110 of a touch panel device mounted on general information terminal is about 500kHz are used several 10 kHz. This also if not electrically connected between the AC signal source 110 inductance element 111 and the driving electrode, generally at the frequency of the AC signal, it is difficult to resonate the drive electrodes. In the touch panel device 1 in the first embodiment, since the inductance element 111 is electrically connected between the AC signal source 110 and the driving electrode, can be reduced the resonance frequency of the driving electrodes, as a result, the frequency of the AC signal in can be resonated driving electrodes, it is possible to improve sensitivity of the touch panel 100.

As the reason for the frequency of the AC signal AC signal source 110 outputs a touch panel device mounted on the general information terminal is 500kHz about several 10 kHz, when the AC signal driving electrodes and the sensing electrodes are transmitted , driving electrodes and the sensing electrodes acts as a low pass filter, if you enter a AC signal frequency higher than 500kHz, the AC signal is because the results in greatly attenuated during transmission of each electrode. Therefore, as the frequency of generally alternating signal, it employs the following frequency cut-off frequency at which the driving electrode and the detection electrode is to function as a low pass filter, each electrode signal thereby reducing the power loss in the transmission there. In the first embodiment, further, by increasing the inductance of the inductance element 111, since it is possible to lower the resonant frequency such as the drive electrodes, for example, it is also resonate driving electrode or the like in frequencies below 500kHz It can become. This realizes a highly sensitive touch panel device 1.

However, to lower the resonant frequency such as a driving electrode below the cut-off frequency such as the drive electrodes and is increased the inductance of the inductance element 111, increasing the resistance loss of the inductance element 111 in proportion to the magnitude of the inductance put away. When excessively increased inductance, there is a fear of lowered sensitivity of the touch panel device 1 by the power loss in the inductance element 111. Therefore, the structure of the driving electrodes such as the cut-off frequency such as a driving electrode is as high as possible may be designed. Then, (if a touch panel device for general communication device, for example, about 1.0 MHz ~ 1.5 MHz) cutoff vicinity of the frequency of such driving electrodes a target value of the resonance frequency due to the inductance element 111 driving electrodes or the like set may be configured to inductance of the inductance element 111 is placed so they too large. Frequency of the AC signal output from the AC signal source 110 is set near the resonance frequency fres by the inductance element 111 and the driving electrode or the like.

As shown in the equivalent circuit of FIG. 5B, the cutoff frequency fc of the transmission line 117, the time constant of the low pass filter composed of the low pass filter time constant (Rd × Csd) and detection electrode Y3 constituted by the drive electrodes X3 a (Rs × Css) and the relationship (Equation 2).

Figure JPOXMLDOC01-appb-M000002

Therefore, in order to increase the cut-off frequency fc, the resistance Rd of the drive electrodes X3, stray capacitance Csd, the resistance Rs of the sensing electrodes Y3, it is necessary to reduce at least one of the stray capacitance Css.

6A shows the electric field intensity reaching the detector electrode from the drive electrode in the touch panel device of the comparative example the inductance element 111 is not connected. 6B is a diagram showing the electric field strength reaching the detection electrode from the drive electrode in the touch panel device 1 of the first embodiment to resonate at the frequency of the AC signal of the AC signal source 110 to drive electrodes or the like by the inductance element 111.

As shown in FIG. 6B, when the AC signal voltage of the resonance frequency fres that is determined by the inductance L and the stray capacitance Csd of the inductance element 111 is applied to the drive electrode 104, the drive electrode 104 through a large resonance current amplitude value. This resonant current, the intensity of the electric field E2 to reach the detection electrode 102 from the drive electrode 104 is larger than the intensity of the electric field E1 near the electrodes of the touch panel device of the comparative example shown in FIG. 6A. As a result, the electric field E2 will reach far from the surface of the touch panel 100. Between the detection object F within range of the electric field E2 is close to the detection object F and the detection electrode 102, the electrostatic capacitance Cf described above is formed. Accordingly, the detection sensitivity for detecting the object F of the touch panel 100 as the reach of the electric field is large will be increased.

In the touch panel device 1 shown in FIG. 3, all of the same inductance element 111 to the drive electrodes X1 ~ X6 are connected. However, the resistance Rd of the drive electrodes X1 ~ X6, since the value of the stray capacitance Csd there are variations, the input impedance of each drive electrodes are not identical, are varied. Therefore, when to resonate the driving electrodes X1 ~ X6 with the same inductance element 111, the resonant frequency of the drive electrodes X1 ~ X6 is a different value. As a result, when the frequency of the AC signal of one type, it may be difficult to supply a large resonance current in all the driving electrodes X1 ~ X6.

Therefore, instead of the inductance element 111, a plurality of different inductance elements inductance selected by the switch may be configured to select the inductance element having an optimum inductance depending on the electrode for inputting an AC signal. Figure 7A is a block diagram of another touch panel device 1002 in the first embodiment. In Figure 7A, the same portions as the touch panel device 1 shown in FIG 1 are denoted by the same reference numbers. In the touch panel device 1002 shown in FIG. 7A, divide the driving electrodes X1 ~ X6, and group GA consisting of drive electrodes X1 ~ X3 close in input impedance, to two groups of Group GB consisting driving electrodes X4 ~ X6 closer input impedance It shows an example of. The drive electrodes X1 ~ X3 belonging to the group GA, the inductance element 111a having an inductance La are connected in series. The driving electrodes X4 ~ X6 belonging to the group GB, the inductance element 111b having an inductance Lb are connected in series. In this way, each electrode group in the near input impedance, the inductance element having an optimum inductance L is connected, it is possible to suppress the variation in resonance frequency between the groups. As a result, the respective electrodes in the driving, it is possible to supply a large resonant current amplitude value, it is possible to improve the sensitivity of the touch panel device 1002.

As a method for grouping the drive electrodes, to check the surroundings of each of the drive electrodes (positional relationship between the ground and the like or other electrode), grouping the drive electrodes between which the surroundings are similar, namely the stray capacitance Csd of it may be divided into a plurality of groups close in value. If similar ambient conditions, it is possible to suppress Therefore come even close the size of the stray capacitance of the driving electrodes, low variation of the input impedance between the electrodes grouped. Figure 7B is a further block diagram of another touch panel device 1003 in the first embodiment. 7B, the components identical to those of the touch panel device 1002 shown in FIG. 7A are denoted by the same reference numbers. In the touch panel device 1003 shown in FIG. 7B, groups the driving electrodes X1, X6 at each end to the group GA, grouped into groups GB drive electrodes X2, X3, X4, X5 in between the driving electrodes X1, X6. Drive electrodes X1, X6 at both ends have different drive electrodes X2, X3, X4, X5 and the surrounding situation where between the driving electrodes X1, X6, believed stray capacitance is different. On the other hand, the driving electrodes X1, X6 belonging to the group GA is in the surroundings that are similar to each other, thus having a stray capacitance similar. Also, the drive electrodes X2, X3, X4, X5 in the group GB is in the surroundings that are similar to each other, thus having a stray capacitance similar. Thus, a group GA, can reduce the variation in the input impedance of GB driving electrodes.

Further, instead of the inductance element 111 in FIG. 3, between the drive electrode switching switch 112 and the drive electrodes X1 ~ X6, it may inductance element is caused to resonate respective drive electrode as construction of electrically connecting. By adopting such a configuration, you can choose the best inductance respective electrodes resonate, thereby improving the electric and magnetic field intensity around the electrode.

Figure 8 is a further block diagram of another touch panel device 1004 in the first embodiment. 8, the same portions as the touch panel device 1 shown in FIG 1 are denoted by the same reference numbers. In the touch panel device 1004 shown in FIG. 8, an inductance element 111-1 to 111-6, the driving electrode changeover switch 112 and is disposed between the drive electrodes X1-X6, all different inductance element to the drive electrodes X1-X6 connecting the 111-1 to 111-6. That is, in FIG. 8, one terminal of the driving electrode switching switch 112 is connected to the inductance elements 111-1 to 111-6, the other terminal is connected to the AC signal source 110. The drive electrode switching switch 112 switches the connection state between the AC signal source 110 and the inductance elements 111-1 to 111-6 between an open state and the short-circuit state.

In this way, it is possible to adjust the inductance of the inductance element for each drive electrode, it is possible to match more accurately the resonant frequency fres. As a result, it is possible to align the detection sensitivity in all the driving electrodes X1 ~ X6.

In the above, by increasing the number of inductance elements, but corresponding to the variation of the input impedance of such driving electrodes, the frequency of resonance the electrodes by an inductance of the input impedance and 3 of each electrode, AC signal source of it may be changing the frequency of the output signal for each electrode to drive. Thus, without increasing the number of the inductance element, it is possible to cause a resonance phenomenon at the electrodes, compact and can realize an inexpensive touch panel device.

Incidentally, the touch panel device 1 in the first embodiment, between the detection electrode (second electrode) Y1 ~ Y6 and detection circuit 114, the inductance element for resonating the detection electrodes Y1 ~ Y6 is electrically connected it may be configured that are not. In this configuration, the frequency of the respective resonant frequency and the AC signal of the detection electrodes Y1 ~ Y6 are different, can be avoided that the detection sensitivity of the detection electrodes Y1 ~ Y6 is too high. Result, when a noise source such as a liquid crystal panel in the vicinity of the touch panel device is present, will receive detects noise electrodes Y1 ~ Y6 emitted is sensitively therefrom noise source, an AC signal is difficult to detect in the detection circuit 114 possible to avoid a situation in which a.

The "resonance frequency" in the first embodiment, the input point of the detection signal at the connection point or detection circuit of the AC signal source of the inductance element, the first electrode selector switch (drive electrode switching switch and X electrode switching in the input impedance characteristics when viewed target electrode through the points to switch, etc.) or the second electrode switching switch (refer to the detection electrode switching switch and the Y electrode change-over switch, etc.), the frequency at which the imaginary component is zero points.

(Embodiment 2)
Figure 9 is a configuration diagram of a touch panel device 2 in the second embodiment. This embodiment is, in FIG. 9, the same portions as the touch panel device 1 of the first embodiment shown in FIG. 1 are denoted by the same reference numbers. The touch panel device 2 of the second embodiment includes a touch panel 120 in place of the touch panel 100 further includes a split electrode switching switch 127.

As shown in FIG. 9, the touch panel 120, the driving electrode Xm (1 ≦ m ≦ 6) driving electrodes at a substantially central portion of the Y-axis direction Xm1 (1 ≦ m ≦ 6) (third electrode) Xm2 (1 ≦ m ≦ 6) (which is bisected into two driving electrodes of the fourth electrode).

Then, further divided electrode switching switch for inputting an AC signal from one of the AC signal source 110 to the two drive electrodes Xm1 (1 ≦ m ≦ 6) and Xm2 (1 ≦ m ≦ 6), the drive electrode switching switch 112 127 are connected in series. Divided electrode switching switch 127 is a switch TSW7 ~ TSW12. The control circuit 115 controls the divided electrode switching switch 127 to connect the drive electrode Xm2 (1 ≦ m ≦ 6) while the detecting electrode switching switch 113 is scanning the detection electrodes Y1 ~ Y3 to the AC signal source 110 , the detection electrode switching switch 113 is connected to the AC signal source 110 to drive electrodes Xm1 (1 ≦ m ≦ 6) while scanning the detection electrodes Y4 ~ Y6, and inputs the AC signal to the drive electrodes. With such driving electrodes X1 ~ X6 two split can be (about 1/2 in FIG. 9) the effective length of the shorter of the respective drive electrodes of the divided compared to pre-division driving electrodes. As a result, smaller than the drive electrodes value of the resistor Rd and the floating capacitance Csd of the driving electrodes are not divided. Accordingly, the cutoff frequency fc when viewed drive electrodes as the transmission line, can be higher than the cutoff frequency fc in the case of not dividing the driving electrode. As a result, since as compared with the case of not dividing the driving electrode and it is possible to increase the frequency of the AC signal, it is possible to reduce the inductance of the inductance element 111 can reduce the resistance loss in the inductance element 111. Thus, it is possible to enhance the electrical or magnetic field emanating from the drive electrode.

Further, in FIG. 9, for example, when the position of detecting the touch of the intersection P13, in the first embodiment that does not divide the driving electrodes, an AC signal inputted from the AC signal source 110 will pass through a path 122. On the other hand, in the present embodiment as divided into two driving electrodes, an AC signal inputted from the AC signal source 110 and thus through the path 123. Length of the drive electrodes X32 to be included in the path 123 is shorter than the length of the drive electrodes included in the path 122 (X3). Thus, when the AC signal is transmitted to the drive electrodes, it can suppress energy loss which is lost in the driving electrode can be realized a highly sensitive touch panel device.

Further, as the touch panel device 2 shown in FIG. 9, according to the configuration of the inductance element 111 is electrically connected between the AC signal source 110 and the driving electrode switching switch 112, an inductance element 111 is 1 element finished, the circuit configuration is simplified, compact and can realize an inexpensive touch panel device. The touch panel device 2 of FIG. 9, 1 because it can be implemented in an AC signal source 110 of the system, can be lowered together with a circuit configuration is simplified, the power consumption.

In FIG. 9, but is configured as a separate switch a split electrode switching switch 127 and the driving electrode switching switch 112 may be a split electrode switching switch 127 as configuration including the drive electrode switching switch 112.

Further, in FIG. 9, the drive electrodes are divided into two parts at a substantially central portion of the Y-axis direction, but by dividing the electrode at a substantially central portion, after dividing the electrode pair (e.g., the drive electrodes X11 and X12 since the input impedance of the pair) is approximated, it is not necessary to prepare the inductance element for each electrode after the division. This realizes a compact touch panel device.

Hereinafter, a modified example 1-7 of the second embodiment will be described with reference to FIG. 15B from Figure 10. In Figure 15B from Figure 10, the same portions as the touch panel device 2 shown in FIG. 9 are denoted by the same reference numbers.

(Modification 1)
Figure 10 is a block diagram of a first modification of the touch panel device 2 in the second embodiment. In this modification, enter two divided driving electrodes Xm1 (1 ≦ m ≦ 6) and driving electrodes Xm2 (1 ≦ m ≦ 6) reverse phase AC signals to each other from one AC signal source 110 in the same time.

The AC signal source 110, the inductance element 111 is connected. The inductance element 111 is directly driven electrode selector switch 124 and is connected via a phase inversion circuit 125. Drive electrode switching switch 124 is composed of sequentially switched are six switches TSW 13 ~ 18, each of the switches TSW 13 ~ 18, is composed of two switches SW1, SW2 operative to intermittently simultaneously with one another. Accordingly, two drive electrodes Xm1 (1 ≦ m ≦ 6) and driving electrodes Xm2 (1 ≦ m ≦ 6) The AC signal phase reversal to each other simultaneously from the AC signal source 110 selected by the drive electrode switching switch 124 It is inputted.

Thereby, the divided electrodes changeover switch 127 of FIG. 9 becomes unnecessary in the present modification, it can be simplified in circuit configuration.

(Modification 2)
Figure 11 is a block diagram of a second modification of the touch panel device 2 in the second embodiment. In this modification, enter two divided driving electrodes Xm1 (1 ≦ m ≦ 6) and driving electrodes Xm2 (1 ≦ m ≦ 6) phase AC signal from one AC signal source 110 in the same time. That this modification is different from the touch panel device 2 are simultaneously connected to an AC signal source 110 without switching the drive electrodes Xm1 and the driving electrode Xm2, in that it entered simultaneously respective drive electrodes an AC signal in-phase is there.

Accordingly, in this modification becomes unnecessary split electrode switching switch 127 in FIG. 9, the circuit configuration can be simplified, can further simplify the circuit configuration phase inverting circuit 125 in FIG. 10 also becomes unnecessary.

(Modification 3)
Figure 12 is a block diagram of a third modification of the touch panel apparatus in the second embodiment. In this modification, at the same time inputs the AC signal into two divided driving electrodes from different AC signal source.

The split into two the drive electrodes Xm1 (1 ≦ m ≦ 6) and driving electrodes Xm2 (1 ≦ m ≦ 6), 2 different AC signal source 110a, the AC signal from 110b are input respectively. Drive electrodes Xm1 (1 ≦ m ≦ 6), the drive electrode switching switch 112a, is connected to an AC signal source 110a through the inductive element 111a. On the other hand, the driving electrodes Xm2 (1 ≦ m ≦ 6), the drive electrode switching switch 112b, are connected to an AC signal source 110b through the inductance element 111b. Drive electrodes selector switch 112a and the driving electrode changeover switch 112b switches operates to select the same drive electrodes Xm1, Xm2 integer m at the same time is performed.

This way, by inputting an AC signal from the two different AC signal source to the driving electrodes divided into two, it is not necessary to bridge to insulated from each other the wiring to the drive electrodes from the AC signal source, it is possible to reduce the number of wiring layers of the wiring board or the like.

(Modification 4)
Figure 13 is a block diagram of a fourth modification of the touch panel device of the second embodiment. In Modification 1-3, the driving electrodes X1 ~ X6 is divided, the same effect be divided detection electrodes Y1 ~ Y6. In this modified example, by dividing the detection electrodes Y1 ~ Y6 into two at substantially a central portion of the X-axis direction, the divided detection electrode Yn1 (1 ≦ n ≦ 6) (fifth electrode) and detection electrode Yn2 (1 ≦ n ≦ 6) (outputs separately an AC signal from the sixth electrode).

In the touch panel 121 of the present modified example, divided into two detection electrodes of the detection electrode Yn1 detection electrodes Y1 ~ Y6 respectively (1 ≦ n ≦ 6) and the detection electrode Yn2 (1 ≦ n ≦ 6). Detection electrode Yn1 (1 ≦ n ≦ 6) is connected to the detection circuit 114a through the detection electrode switching switch 113a. Detection electrodes Yn2 (1 ≦ n ≦ 6) is connected to the detection circuit 114b through the detecting electrode switching switch 113b. Detecting electrode switching switch 113a is driven by electrode switching switch 112, while the drive electrodes X1 ~ X3 is selected, scanned to sequentially connected to a detection circuit 114a detecting electrode Yn1 (1 ≦ n ≦ 6). Detecting electrode switching switch 113b is driven by electrode switching switch 112, while the driving electrodes X4 ~ X6 is selected, scanned to sequentially connected to a detection circuit 114b detects electrode Yn2 (1 ≦ n ≦ 6).

Thus, when the detection electrode is divided into two, it can be shortened average effective length of the detection electrodes of the transmission path from the AC signal source 110 to the detection circuit 114a or the detection circuit 114b. As a result, the average effective value of the resistor Rs and the stray capacitance Css of the detection electrode is smaller than that before the division. Accordingly, the cutoff frequency fc of the transmission path, can be higher than the cutoff frequency fc in the case of not dividing the detection electrode. The touch panel 121 of the second embodiment, in order to have the detection electrodes of the electrode of the longer major axis than X electrode (Y electrode), the effect of better to divide the detection electrode is higher cut-off frequency increases. This technical idea may be performed partitioning the electrodes in preference from the longest electrode length.

The drive electrode facing the detection electrode Yn1 (1 ≦ n ≦ 6) (13, drive electrodes Xn (1 ≦ n ≦ 3)) and one drive electrode of the detection electrode Yn2 (1 ≦ n ≦ 6) opposite to that drive electrodes (13, drive electrodes Xn (4 ≦ n ≦ 6) to the one drive electrode of the), the AC signal from the AC signal source 110 is input so that the drive electrode switching switch 112 may be configured to be controlled. Thus among the electrode of the driving electrodes X1 ~ X6, it is possible to scan the two electrodes at the same time, it is possible to shorten the scanning time of the drive electrodes X1 ~ X6.

Also the such an effect is obtained is because the detection electrodes are divided.

Further, in FIG. 13, the detection circuit 114a in each divided detection electrodes have been connected to 114b, and the detection electrode switching switch 113a and the detection circuit 114a, the configuration is not operated and the detection electrode switching switch 113b and the detection circuit 114b simultaneously doing, similarly to the touch panel device 2 shown in FIG. 9, one detection electrode switching switch and one detection circuit, it can be switched control division electrode switching switch. In this way, together with the detection circuit circuit configuration is simplified because requires only one system, it is possible to reduce the power consumption.

(Modification 5)
Figure 14 is a configuration diagram of a fifth modification of the touch panel apparatus in the second embodiment. In this modification, two split both driving electrode and the detection electrode on each of the substantially central portion. Drive electrodes Xm (1 ≦ m ≦ 6) is divided to the drive electrodes Xm1 (1 ≦ m ≦ 6) and driving electrodes Xm2 (1 ≦ m ≦ 6), the detection electrodes Yn (1 ≦ n ≦ 6) is the detection electrode Yn1 is divided into (1 ≦ n ≦ 6) and the detection electrode Yn2 (1 ≦ n ≦ 6). Other configurations, 12, is the same as FIG. 13, the description thereof is omitted.

Accordingly, in a transmission path from the AC signal source 110a to the detection circuit 114a and the average effective length of the driving electrodes and the detecting electrodes of the transmission path from the AC signal source 110b to the detection circuit 114b is shorter. As a result, the resistance Rd of the drive electrodes, the stray capacitance Csd of the resistor Rs and the drive electrode of the detection electrode, the average effective value of the stray capacitance Css of the detection electrode is further reduced in comparison with the touch panel device having an electrode which is not divided. Accordingly, the cutoff frequency fc of the transmission path can be further higher than the cutoff frequency fc in the case of not dividing the electrode.

Incidentally, the modification 4 Similarly, the AC signal source, and a drive electrode switching switch and the detection electrode switching switch one system, divided driving electrodes and detecting electrodes may be switched, respectively. Furthermore, modification 4 Similarly, in the drive electrode (14 facing the detection electrode Yn1 (1 ≦ n ≦ 6) is one Xn2 (1 ≦ n ≦ of Xn1 (1 ≦ n ≦ 3) one pair and one drive electrode of the), the drive face the detection electrode Yn2 (1 ≦ n ≦ 6) electrodes of the three) (in FIG. 14, Xn1 (4 ≦ n ≦ 6) one Xn2 in and one drive electrode of the one of the pair) of (4 ≦ n ≦ 6), AC signal source 110a, the driving electrode switching as an AC signal from 110b is applied from among the switch 112a, 112b may be configured to be controlled.

The In either modification, illustrates a case where the short axis electrode (X electrode) and the drive electrodes, the long axis of the electrode (Y electrode) may be used as the drive electrode. If the Y electrode and the drive electrode, the resistance Rd and the floating capacitance Csd of the drive electrodes is larger as compared with the case of driving electrodes X electrode, the effect of dividing the electrode becomes larger.

(Modification 6)
Figure 15A is a configuration diagram of a sixth modification of the touch panel device of the second embodiment. This modification detects an AC signal by the connected differential amplifier to the two detection electrodes. Incidentally, shows only the selected electrodes in FIG. 15A by the solid line, the electrodes that are not selected are indicated by broken lines.

Figure 15A relates to the detection of Modification 2 shown in FIG. 10. Differential amplifier 126 is non-inverting input terminal (+) and the inverting input terminal (-) and an output terminal, obtained by subtracting the input signal to the inverting input terminal from the non-inverting input the signal input to the terminal and it outputs the difference from the output terminal. Driving electrodes X3 is divided to the drive electrodes X31 and the driving electrode X32. Detection signals from the detection electrodes Y2 intersecting the drive electrodes X32 is connected to the non-inverting input terminal of the differential amplifier 126. On the other hand, the detection signal from the detection electrode Y4 intersecting the drive electrodes X31 is connected to the inverting input terminal of the differential amplifier 126. Differential amplifier 126 outputs a difference detection signal and the detection signal of the detection electrode Y4 of the detection electrodes Y2 to the detection circuit 114. Thus, it is possible to remove common mode noise from LCD107 like the detection electrode Y2 and the detection electrode Y4 pick up, it is possible to increase the detection sensitivity of the touch panel device 2. Note that in FIG. 15A, the detection of either of whether there is a touch detection electrodes Y2, Y4 may be identified by the polarity of the detection signal of the differential amplifier 126. Voltage of the signal output from the detection electrode is closer to the detection object F is lower as shown in FIG. 2E. Thus, in the circuit shown in FIG. 15A, when the signal output from the differential amplifier 126 is the absolute value of the positive and is and its signal is above a predetermined threshold value, the detection circuit is touched near the detection electrodes Y4 114 can be determined. Further, the detection circuit 114 is touched near the detection electrode Y2 when the absolute value of is and its signal is negative signal output from the differential amplifier 126 is above a predetermined threshold value can be determined. A detection circuit 114 is not touched to close any of the differential amplifier 126 detecting electrodes Y2, when the absolute value of the output signal is less than a predetermined threshold value from Y4 can be determined.

(Modification 7)
Figure 15B is a block diagram of a seventh modification of the touch panel device of the second embodiment. FIG. 15B relates to the detection of Modification 4 shown in FIG. 13. Detection electrodes Y2 is divided into two detection electrodes Y21 and the detection electrode Y22. Detection signals from the detection electrodes Y22 intersecting the driving electrode X5 is connected to the non-inverting input terminal of the differential amplifier 126. On the other hand, the detection signal from the detection electrodes Y21 which does not intersect with the drive electrodes X5 is connected to the inverting input terminal of the differential amplifier 126. Differential amplifier 126 outputs a difference detection signal and the detection signal of the detection electrodes Y21 detection electrodes Y22 to detection circuit 114. Thus, it is possible to remove common mode noise from LCD107 like the detection electrodes Y21, Y22 pick up, it is possible to increase the detection sensitivity of the touch panel device 2. Note that in FIG. 15B, the detection of either of whether there is a touch detection electrodes Y21, Y22 may be identified by the polarity of the detection signal of the differential amplifier 126. Similar to the circuit shown in FIG. 15A, the circuit shown in FIG. 15B, when the signal output from the differential amplifier 126 is the absolute value of the positive and is and its signal is above a predetermined threshold value, the detection electrodes Y21 a detection circuit 114 is touched close can be determined. Further, the detection circuit 114 is touched near the detection electrode Y22 in the case the absolute value of is and its signal is negative signal output from the differential amplifier 126 is above a predetermined threshold value can be determined. A detection circuit 114 either not touched to close the detection electrodes Y21, Y22 if the absolute value of a signal output from the differential amplifier 126 is less than the predetermined threshold value can be determined.

Modification 6, close to the inverting input terminal and noninverting connected thereto detecting electrode to the input terminal is touched similarly be detected electrode opposite shown in FIGS. 15A and 15B the position of the differential amplifier 126 it is possible to detect the detection electrode.

(Embodiment 3)
Figure 16 and Figure 17 is a configuration diagram of a touch panel device 3 in the third embodiment. 16, the same portions as the touch panel device 1 according to the first embodiment shown in FIG. 3 are denoted by the same reference numbers. In the touch panel device 3 in the third embodiment, unlike the first embodiment, the AC signal is input from both ends of a single drive electrode.

In Figure 16, in a state in which the driving electrode X3 and the detection electrode Y5 is selected (state for detecting the touch of intersection P35), one end of the driving electrodes X3 by one AC signal source 110 Pe1 and the other end Pe2 AC signal is input from. Here, both ends of the driving electrodes X3 (end Pe1 and end Pe2) are electrically connected. That is, one terminal electrically connected to the driving electrodes X3 driving electrode changeover switch is connected with two ends electrically short-circuited state in the Y-axis direction of the driving electrodes X3. In this case, the AC signal from the AC signal source 110 to the detection circuit 114 as the path through, there are paths 131 and path 132 as shown in FIG. 16. Path 131, the end Pe1 drive electrode X3, a path to the detection circuit 114 via the intersection P35. Path 132, the end Pe2 of the driving electrodes X3, is a path to the detection circuit 114 via the intersection P35. Here, the length of the driving electrodes X3 included in the path 131 is shorter than the length of the drive electrodes X3 included in the path 132. Therefore, the resistance Rd1 driving electrodes X3 included in the path 131 is smaller than the resistance Rd2 driving electrodes X3 included in the path 132. Therefore, the larger AC signal current flows through a path 131.

In Figure 17, in a state in which the driving electrode X3 and the detection electrode Y2 is selected (state for detecting the touch of intersection P32), one end of the driving electrodes X3 from one AC signal source 110 Pe1 and the other end Pe2 AC signal is input from. Here, the two ends of the driving electrodes X3 (end Pe1 and end Pe2) are electrically connected in a short-circuit state. In this case, the path which the AC signal current flows from the AC signal source 110 to the detection circuit 114, there are pathways 133 and path 134. Path 133, the end Pe1 drive electrode X3, a path to the detection circuit 114 via the intersection P32. Path 134, the end Pe2 of the driving electrodes X3, is a path to the detection circuit 114 via the intersection P32. Here, the length of the driving electrodes X3 included in the path 134 is shorter than the length of the drive electrodes X3 included in the path 133. Therefore, the resistance Rd4 driving electrodes X3 included in the path 134 is smaller than the resistance Rd3 driving electrodes X3 included in the path 133. Therefore, the larger AC signal current flows through a path 134.

Thus, through electrically connecting both ends of one of the driving electrodes, applying an AC signal voltage from both ends, the shorter path from the AC signal source 110 to the detection circuit 114 (the lower path more resistance), more AC signal current flows. Therefore, in comparison with the case of applying an AC signal voltage from only one end Pe1 of the driving electrodes, it is possible to reduce the effective resistance of the transmission path, it is possible to increase the cut-off frequency fc of the transmission path Become. Similarly, it is possible to reduce the effective resistance of the transmission path, it is possible to reduce the transmission loss of an AC signal, it can be realized with a touch panel device 3 low consumption.

In the touch panel device 3 shown in FIGS. 16 and 17, although the AC signal from both ends of one driving electrode is input, a similar concept, even if a detection signal from both ends of one detection electrode, the detection electrode resistance can be lowered, it is possible to increase the cut-off frequency fc.

Figure 18 and Figure 19 is a block diagram of another touch panel device 3A according to the third embodiment. 18 and 19, the same portions as the touch panel device 1 according to the first embodiment shown in FIG. 3 are denoted by the same reference numbers. In the touch panel device 3A shown in FIG. 18, in a state in which the driving electrode X2 and the detection electrode Y2 is selected (state for detecting the touch of intersection P22), an AC signal is input from the AC signal source 110 to the drive electrodes X2, detection electrodes one end of Y2 Ps1 and the other end Ps2 is connected to one detection circuit 114. Here, both ends of the detection electrodes Y2 (end Ps1 and end Ps2) are electrically connected. That is, one terminal detected electrode Y2 electrically connected detecting electrode switching switch is connected at both ends of the X-axis direction and electrically shorted state of the detection electrode Y2. In this case, the path which the AC signal current flows from the AC signal source 110 to the detection circuit 114, there are pathways 135 and path 136. Path 135 includes an AC signal source 110, the intersection P22, a path to the detection circuit 114 via the end Ps1. Path 136, the AC signal source 110, the intersection P22, a path to the detection circuit 114 via the end Ps2. Here, the length of the detection electrodes Y2 included in the path 135 is shorter than the length of the detection electrodes Y2 included in the path 136. Therefore, the resistance Rs1 of the detection electrodes Y2 included in the path 135 is smaller than the resistance Rs2 of the detection electrodes Y2 included in the path 136. Therefore, the more the alternating signal current will flow path 135.

On the other hand, in FIG. 19, in a state in which the drive electrodes X5 and the detection electrode Y2 is selected (state for detecting the touch of intersection P25), an AC signal is input from the AC signal source 110 to the drive electrodes X5, one of the detection electrodes Y2 end Ps1 and the other end Ps2 of the are connected to one detection circuit 114. Here, both ends of the detection electrodes Y2 (end Ps1 and end Ps2) are electrically connected. In this case, the path through which the alternating signal current from the AC signal source 110 to the detection circuit 114, there are pathways 137 and path 138. Path 137, the AC signal source 110, the intersection P25, a path to the detection circuit 114 via the end Ps1. Path 138 includes an AC signal source 110, the intersection P25, a path to the detection circuit 114 via the end Ps2. Here, the length of the detection electrodes Y2 included in the path 138 is shorter than the length of the detection electrodes Y2 included in the path 137. Therefore, the resistance Rs4 detection electrodes Y2 included in the path 138 is smaller than the resistance Rs3 detection electrodes Y2 included in the path 137. Therefore, the more the alternating signal current will flow path 138.

Thus, electrically connecting both ends of one detection electrode and outputs an AC signal from the two ends, the alternating signal current through the shortest path from the AC signal source to the detection circuit (small path having transmission resistance) It flows. Therefore, as compared with the case of taking out an alternating signal current from only one end Ps1 of the detection electrodes, it is possible to reduce the effective resistance of the transmission path, it is possible to increase the cut-off frequency fc of the transmission path . Similarly, it is possible to reduce the effective resistance of the transmission path, it is possible to reduce the transmission loss of an AC signal, it can be realized a low touch panel device 3A.

(Embodiment 4)
Figure 20A is a cross-sectional schematic view of a touch panel device 1000 of the fourth embodiment. Figure 20B is a diagram showing a waveform of a signal of a touch panel device 1000. In FIG. 20A, the same portions as the touch panel device 1 of the first embodiment shown in FIG. 1 are denoted by the same reference numbers. In the fourth embodiment, shields efficiently noise generated from like LCD 107.

Shielding layer 106 is disposed between the LCD107 and the electrode layer 108 on the touch panel 100 as shown in FIG. 20A. When the shield layer 106 in the vicinity of the electrode layer 108 is disposed, the driving electrode 104 and detecting electrode 102, stray capacitance between the shield layer 106 (stray capacitance Cs3, Cs6 in FIG. 5A) is generated, the transmission path of the cut-off frequency fc is lowered. The touch panel device 1000 of the fourth embodiment is further provided with a ground switch SW10 which is controlled by the control circuit 115 is connected between the shield layer 106 and the ground. The control of the ground switch SW10, while shielding the noise from the like LCD 107, it is possible to reduce the stray capacitance.

In LCD 107, in order to prevent damage to itself, which inverts the polarity of the drive signal LCD 107 periodically. Predetermined time period Tn (hereinafter, referred to as noise periods Tn) at the time of inverting the polarity spike noise occurs. Noise period Tn is a predetermined period in the image display frame period for displaying an image T (e.g., 1/60 Hz). Drive electrodes 104 and the detection electrode 102 of the touch panel 100 causes erroneous detection when picking up this noise. LCD107 is the noise period Tn, to generate a larger noise than other periods.

As shown in FIG. 20B, during the noise period Tn is connected to the shield layer 106 to the ground, some or all of the periods except for the noise period Tn is the control circuit 115 to disconnect the shield layer 106 from the ground with the ground to control the switch SW10.

By such control, together with the noise generated from the LCD107 shields from jumping to the drive electrodes 104 and the detection electrodes 102, to reduce the stray capacitance between the drive electrode 104 and the detection electrode 102 and the shield layer 106 it becomes possible.

The noise period Tn which controls the ground switch SW10 connects the shield layer 106 ground and, since the cutoff frequency is lowered by the stray capacitance is increased, the control circuit 115 the frequency of the noise period Tn only AC signals becomes below the cut-off frequency is lowered, it may control the AC signal source 110 so as to decrease than the frequency in the period other than the noise period Tn.

Figure 20C is a schematic sectional view of another touch panel device 1000A in Embodiment 4. In Figure 20C, the same portions as the touch panel device 1000 shown in FIG 20A are denoted by the same reference numbers. The touch panel device 1000A shown in FIG. 20C, instead of the inductance element 111, a variable inductance element 111V capable of changing inductance. In the touch panel device 1000A, when the low frequency of the AC signal, the control circuit 115 switches the value of the variable inductance element 111V to lower the resonant frequency. Specifically, the control circuit 115 is larger than the variable inductance element periods other than the noise period Tn inductance 111V in noise period Tn, even stray capacitance by conductive ground switch SW10 is increased, the resonant frequency it can be matched to the frequency of the AC signal. This realizes a highly sensitive touch panel device 1000A. Variable inductance element 111V, for example, can be constituted by a plurality of inductance elements which are selected by the control circuit 115. Or, the variable inductance element 111V can also be composed of a plurality of inductance elements connected in series, and a plurality of switches respectively connected in parallel to those of the inductance element.

(Embodiment 5)
Figure 21 is a configuration diagram of a touch panel device 1005 in the fifth embodiment. In FIG. 21, the same portions as the touch panel device 1 according to the first embodiment shown in FIG. 3 are denoted by the same reference numbers. The touch panel device 1005 in the fifth embodiment, the shield efficiently noise generated from the LCD 107 (FIG. 1) or the like.

In the touch panel device 1 according to the first embodiment shown in FIG. 3, the electrode that is not selected in the touch panel 100 (the driving electrodes and detecting electrodes) is connected to the ground, influence the electrode noise is selected from like LCD107 It is prevented from. However, in the state in which the electrode around the selected electrode is connected to ground, stray capacitance between the selected electrode and the surrounding electrode Cs1, Cs2, Cs4, Cs5 (FIG. 5A) becomes large, alternating the cut-off frequency fc of the transmission path from the signal source 110 to the detection circuit 114 becomes low. As a result, attenuation of the AC signal input from the AC signal source 110 is increased, the detection sensitivity of the touch panel 100 is reduced.

In the touch panel device 1005 in the fifth embodiment, the control circuit 115 opens separately from the stray capacitance only ground the electrode adjacent to the largest selection electrodes an AC signal source 110 detecting circuit 114. between the selected electrodes, so as to connect the selected electrode and the electrode other than the electrode selection electrode adjacent thereto in the ground, to control the drive electrode switching switch 112 and the detection electrode switching switch 113. For example, as shown in FIG. 21, in the state where one drive electrode X3 and one detection electrode Y3 is selected, the control circuit 115 further drive electrodes X2, X4 and certain detection adjacent to one drive electrode X3 another detection electrodes Y2, Y4 adjacent to the electrode Y3 is opened separately from the ground, the driving electrodes X1, X5, X6 and detection electrodes Y1, Y5, Y6 drive electrode switching switch 112 and the detection electrode so as to be connected to ground to control the change-over switch 113.

This control prevents a decrease in the cutoff frequency fc, and it is possible to achieve both the shielding of noise from LCD107 etc., it can achieve high touch panel device 1005 detection sensitivity. Further, since the electrode close to the selective electrode is disconnected from ground, the electromagnetic field intensity emitted from the selected electrodes is increased, it is possible to detect the more distant object to be detected.

The electrode disconnected from ground need not be both driving electrodes and detecting electrodes may be at least one of the electrodes. Similar to the touch panel device 1000,1000A of the fourth embodiment shown in FIGS. 20A and FIG. 20C, while the control circuit 115 noise period Tn is connected to other than the selected electrodes to the ground, a period excluding the noise period Tn one part or neighboring electrodes to the selection electrodes in total may be disconnected to the ground. The electrode disconnecting the connection to the ground, not only adjacent electrodes may detach the electrode away from the further selection electrode from the ground.

(Embodiment 6)
For the touch panel device 6 according to the sixth embodiment will be described with reference to FIGS. 22 to 24B. The touch panel device according to the first to fifth embodiments is a mutual capacitance-type touch panel device, a touch panel device of the sixth embodiment is a self-capacitance type touch panel device.

Briefly explaining the operation principle of the self-capacitance type touch panel device first. Whereas mutual capacitance type for detecting a change of the mutual capacitance of the intersection of lattice shape arrayed drive electrode and the detection electrode, the self-capacitance type has one electrode serve driving electrode and the detection electrode, the electrode and it detects a change in capacitance (self-capacitance) between itself and the ground.

Figure 22 is a cross-sectional schematic view of the touch panel 200 to be mounted on the touch panel 6 in the sixth embodiment. 22, components identical to those of the touch panel 100 according to the first embodiment shown in FIG. 1 are denoted by the same reference numbers. The touch panel 200 is a self-capacitance type touch panel, having a substantially similar structure to that of the touch panel 100 of the mutual capacitance type. The touch panel 200, as shown in FIG. 22, includes a glass layer 103 which is an insulating layer, and a Y electrode 202 and X electrode 204 that face each other across the glass layer 103. Glass layer 103 and the Y electrode 202 and X electrode 204 constituting the electrode layer 208. Y electrode 202 and X electrode 204 are arranged in a grid pattern so as to extend at right angles to each other. Each electrode is driven voltage Vs is an AC signal from the AC signal source is applied, to detect a change in the self-capacitance of each electrode as a change in the AC signal voltage. Y electrode 202 is located near the protective layer 101 as compared to the X electrode 204. Since X electrodes 204, Y electrodes 202 operate together on the same principle, will be described below Y electrode 202 is closer to the protective layer 101 or surface.

Figure 23D Figures 23A is a diagram for explaining the operating principle of the self-capacitance type touch panel device 6. Figure 23A is a cross-sectional schematic view of the electrode layer 208 of the touch panel 200 of the touch panel device 6. Figure 23B is an equivalent circuit diagram of the touch panel 200 shown in FIG. 23A. Figure 23C shows a waveform of a driving voltage Vs applied to the Y electrode 202. Figure 23D is a waveform of the detection voltage Vd3 when there is no touch detected object F of the operator's finger or the like and shows the waveform of the detection voltage Vd4 when there is a touch.

Between the Y electrode 202 and the ground are present stray capacitance Csy. In this state, the detection object F capacitance Cey occurs between Touching the surface of the touch panel 200 and the Y electrode 202 and the detection object F. The capacitance cey, since a part of the charge stored in the stray capacitance Csy escapes to the ground through the finger, the detection voltage Vd4 is smaller than the detection voltage Vd3 in the absence of a touch. Therefore, by comparing the detection voltage Vd and threshold voltage Vth which is set in advance, it is possible to detect a touch to the touch panel 200. X electrodes 204 also operate similarly to the Y electrode 202.

Figure 24A is a configuration diagram of a touch panel device 6 according to the sixth embodiment. As shown in FIG. 24A, the touch panel device 6 includes a touch panel 200, the AC signal source 210a, and 210 b, and the X electrode selector switch 212a, a Y electrode switching switch 212b, the detection circuit 214a, and 214b, and a control circuit 215 provided.

In Figure 24A, the X axis in the longitudinal direction of the touch panel 200, a direction orthogonal to the X-axis and Y-axis. The touch panel 200 includes a plurality of X electrodes 204 (first electrode), and a plurality of Y electrodes 202 (second electrodes). A plurality of X electrodes 204 are arranged at substantially equal intervals in the X-axis direction (first direction), extending in the Y-axis direction (second direction). A plurality of Y electrodes 202 are arranged at substantially equal intervals in the Y-axis direction, extending in the X-axis direction. In this embodiment in order to simplify the explanation, the X electrode 204 is composed of six X electrodes XS1 ~ XS6, Y electrode 202 is assumed to be composed of six Y electrodes YS1 ~ YS6. X electrodes XS1 ~ XS6 via the Y electrodes YS1 ~ YS6 the glass layer 105 extends orthogonally are arranged in a grid pattern so as to face each other.

AC signal source 210a is connected to the X electrode selector switch 212a (a first electrode changeover switch) and the detection circuit 214a through the inductive element 211a. X electrode switching switch 212a is connected to the X electrodes XS1 ~ XS6. AC signal source 210b is connected to the Y electrode selector switch 212b (second electrode selector switch) and the detection circuit 214b through the inductance element 211b. Y electrode switching switch 212b is connected to the Y electrodes YS1 ~ YS6.

X electrode selector switch 212a and the Y electrode selector switch 212b are controlled by the control circuit 215. Construction and operation of the X electrode switching switch 212a and the Y electrode switching switch 212b operates similarly to the drive electrode switching switch 112 and the detection electrode switching switch 113 of the first embodiment.

In the touch panel device 6, stray capacitance Csx is present between the X electrodes XS1 ~ XS6 and ground. Resonant frequency fresx of the series resonant circuit of 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, represented by equation (3).

Figure JPOXMLDOC01-appb-M000003

Thus, from an AC signal source 210a and applies an AC signal voltage of a frequency fresx resonance current flows, it is possible to increase the detection sensitivity of the touch panel device 6 in the same manner as the touch panel device 1 in the first embodiment.

Further, the cut-off frequency fcx of the transmission path from the AC signal source 210a to the detection circuit 214a includes a resistor Rx of X electrodes XS1 ~ XS6, proportional to the reciprocal of the time constant (Rx × Csx) determined by the product of the stray capacitance Csx to. That is, the cutoff frequency fcx is expressed by equation (4).

Figure JPOXMLDOC01-appb-M000004

Therefore, in order to increase the cut-off frequency fcx of the transmission path including the X electrodes XS1 ~ XS6, it is necessary to reduce at least one of the resistors Rx and stray capacitance Csx.

Similarly, stray capacitance Csy is present between the Y electrodes YS1 ~ YS6 and ground. Resonant frequency fresy of the series resonant circuit of 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, represented by equation (5).

Figure JPOXMLDOC01-appb-M000005

Thus, from an AC signal source 210b and applies an AC signal voltage of a frequency fresy resonance current flows, it is possible to increase the detection sensitivity of the touch panel device 6 in the same manner as the touch panel device 1 in the first embodiment.

Further, the cut-off frequency fcy of the transmission path from the AC signal source 210b to the detection circuit 214b includes a resistance Ry of the Y electrodes YS1 ~ YS6, proportional to the reciprocal of the time constant (Ry × Csy) which is determined by the product of the stray capacitance Csy to. That is, the cutoff frequency fcy is expressed by equation (6).

Figure JPOXMLDOC01-appb-M000006

Therefore, in order to increase the cut-off frequency fcy of the transmission path including Y electrodes YS1 ~ YS6, it is necessary to reduce at least one of the resistors Ry and stray capacitance Csy.

Thus, according to the sixth embodiment, even self-capacitance type touch panel device 6, by connecting an inductance element between an AC signal source and the electrode constitute a resonant circuit, by passing the resonance current to the electrodes , it is possible to increase the electric field strength around the electrodes, it is possible to improve the detection sensitivity.

As described above, self-capacitance type touch panel device, a touch panel device and a detection principle of mutual capacitance type is different, factors that determine the resonance frequency of the transmission path, factors that determine the cutoff frequency, the effect of noise from the LCD etc. are the same as the mutual capacitance type touch panel device. Therefore, technology of the touch panel device of the fifth embodiment 1 to embodiment example is also applicable similarly to a touch panel device 6 of the sixth embodiment, the same effects.

Figure 24B is a block diagram of another touch panel device 6A according to the sixth embodiment. In Figure 24B, the same portions as the touch panel device 6 shown in FIG. 24A are denoted by the same reference numbers. The touch panel device 6A includes an inductance element 211a, the inductance element 211a-1 ~ 211a-6,211b-1 ~ 211b-6 in place of 211b of the touch panel device 6 shown in FIG. 24A, X electrode switching switch 1212a and the Y electrode selector switch further comprising a and 1212b. Like the touch panel device 1004 according to the first embodiment shown in FIG. 8, an inductance element 211a-1 ~ 211a-6 between the X electrodes XS1 ~ XS6 the AC signal is input and the X electrode switching switch 212a is in series connected inductance elements 211b-1 ~ 211b-6 between the Y electrodes YS1 ~ YS6 and Y electrode change-over switch 212b that AC signal is inputted are connected in series. X electrode switching switch 1212a is similar to the X electrode switching switch 212a, and sequentially connected to the detection circuit 214a to X electrodes XS1 ~ XS6, Y electrode switching switch 1212b is similar to the Y electrode switching switch 212b, the Y electrodes YS1 ~ YS6 to connect to the sequential detection circuit 214b. Specifically, when the X electrode switching switch 212a is connected to the AC signal source 210a inductance elements 211a-m (1 ≦ m ≦ 6), the X electrode switching switch 1212a connects the X electrodes XSm the detection circuit 214a to. Further, when the Y electrode switching switch 212b is connected to the AC signal source 210b inductance elements 211b-n (1 ≦ n ≦ 6), Y electrode switching switch 1212b connects the Y electrode YSn the detection circuit 214b. This operation can form a similar circuit with the touch panel device 6 shown in FIG. 24A for each of the X electrodes XS1 ~ XS6 and Y electrodes YS1 ~ YS6, a position detection object F has touched the touch panel 200 with a high sensitivity and it can be detected with high accuracy.

(Embodiment 7)
Figure 25A is a cross-sectional schematic view of a touch panel device 1007 according to the seventh embodiment. In FIG. 25A, the same portions as the touch panel device 1 of the first embodiment shown in FIG. 1 are denoted by the same reference numbers. The touch panel device 1007 shown in FIG. 25A further includes an inductance element 140 connected in series between the input side and the ground of the drive electrodes 104 of the touch panel device 1 in the first embodiment. That is, the inductance element 140 are connected in series between the one end and the ground, which is electrically connected to the inductance element 111 of the drive electrodes 104. Here, at the frequency of the AC signal of the AC signal source 110, so that the stray capacitance Csd of the inductance element 140 and the driving electrode 104 resonates, by selecting the inductance of the inductance element 140, the stray capacitance of the driving electrodes 104 Csd it is possible to reduce the apparent. This makes it possible to raise the cutoff frequency of the drive electrodes, it is possible to reduce the inductance of the inductance element 111. This can reduce the resistance loss in the inductance element 111 can increase the sensitivity of the touch panel device 1007.

Figure 25B is a schematic sectional view of another touch panel device 1007A in the seventh embodiment. In Figure 25B, the same portions as the touch panel device 1 of the first embodiment shown in FIG. 1 are denoted by the same reference numbers. The touch panel device 1007A shown in Figure 25B further comprises a capacitor 141 for shunt connected in series between the output side of the end portion and the ground of the drive electrodes 104 of the touch panel device 1 in the first embodiment. That is, the capacitor 141 between the direction of the at least one end portion and the ground of extension of the inductance element 111 electrically connected to the drive electrodes 104 are connected in series. Thus, it is possible to reduce the resonance frequency of the driving electrodes 104, the result, it is possible to reduce the inductance of the inductance element 111. This can reduce the resistance loss in the inductance element 111 can increase the sensitivity of the touch panel device 1007A.

(Embodiment 8)
Figure 26 is a configuration diagram of a touch panel 221 of the touch panel device according to the eighth embodiment. In Figure 26, the same portions as touch 200 of the touch panel device 6 of the sixth embodiment shown in FIG. 24A are denoted by the same reference numbers. Generally the long axis of the electrode (in FIG. 26 Y electrode), the resistance is larger than that of the minor axis electrode (in FIG. 26 X electrode). In the touch panel 221 shown in FIG. 26, the width W1 of the direction at right angles with the direction of the X axis of extension of the long axis of the electrode, it is wider than the width W2 direction of the Y-direction perpendicular of extension of the minor axis electrodes. Thus, it is possible to increase the cut-off frequency of the transmission path from the AC signal source to the detector.

Figure 27 is a block diagram of a touch panel 222 of another touch panel device according to the eighth embodiment. In Figure 26, the same portions as touch 200 of the touch panel device 6 of the sixth embodiment shown in FIGS. 22 and 24A are denoted by the same reference numbers. Nearby electrode by a common shield layer 106 (in FIG. 27 X electrode), the stray capacitance between the shield layer 106 is larger than the shield layer 106 farther electrode (in FIG. 27 Y electrode). In the touch panel 222 according to the eighth embodiment shown in FIG. 27, the X axis extending distant Y electrode direction at right angles with the direction of the width W4 of the Y-axis of extension of the X electrode close to the shield layer 106 from the shield layer 106 perpendicular to the direction of it is preferred to larger than width W3. Thus, it is possible to reduce the resistance of the X electrodes near the shield layer 106, it is possible to increase the cut-off frequency of the transmission path from the AC signal source to the detector.

The configuration of the touch panel device in Embodiments 7 and 8 shown in FIG. 27 from FIG. 25A may be applied to all of the touch panel device according to the first to sixth embodiments have the same effect.

(Embodiment 9)
Figure 28 is a configuration diagram of a touch panel device according to the ninth embodiment. In Figure 28, the same portions as the touch panel device 1 of the first embodiment shown in FIG. 1 are denoted by the same reference numbers. The touch panel device 1009 shown in FIG. 28 includes a touch panel 1019 in place of the touch panel 100 in the first embodiment. The extending direction of the driving electrodes X1 ~ X6 In the touch panel 1019 is not perpendicular to the direction of extension of the detection electrodes Y1 ~ Y6. However, as the touch panel device 1 in the first embodiment, among the intersection of drive electrodes X1 ~ X6 is opposed to the detection electrodes Y1 ~ Y6, is possible to detect the intersection of the detection object F touches the high sensitivity It can have the same effect.

In the touch panel device 1 according to the first embodiment shown in FIG. 1, the touch panel 100 is only one of the drive electrodes X1, it may comprise only one detection electrode Y1 opposite to the driving electrode X1. The touch panel device can be used as a touch sensor detecting object for detecting whether the touch panel 100 with a high sensitivity, has the same effect as the touch panel device 1 in the first embodiment.

The configuration of the touch panel device according to the ninth embodiment can be applied to all of the touch panel device according to the first to eighth embodiments have the same effect.

As described above, the touch panel device according to the first to eighth embodiments, it is possible to both increase the detection position accuracy and detection sensitivity with a simple structure.

In the above embodiment, LCD 107 is mounted on the touch panel 100 and 200. In applications for touch detection without displaying the image on the touch panel surface LCD107 it is not necessarily essential components.

In the above embodiment, the driving electrode 104, the detection electrodes 102, X electrodes 204 and Y electrodes 202 has been arranged at substantially regular intervals may not be arranged necessarily at equal intervals, different by position it may be arranged at intervals. For example, the touch panel 100, if it is identified region finger is frequently touched by arranging the spacing of the electrodes 102, 104 in the area narrower than the other regions, it is possible to increase the resolution of the touch position .

In the above embodiment, the control circuit 115, 215 is driven electrode switching switch 112 sequentially switches but the detection electrode switching switch 113, X electrode switching switch 212a and the Y electrode switching switch 212b, switching of the electrode is necessarily carried out sequentially even if not well may be switched while skipping one or more electrodes.

Further, the control circuit 115, 215 is the electrode switching switch 112,113,212a to select a plurality of electrodes at the same time, it may be switched 212b.

For example, the touch panel device 1 shown in FIG. 3, the control circuit 115 is connected maintain multiple driving electrodes X1, X2 which are adjacent to each other among the plurality of driving electrodes X1 ~ X6 simultaneously to the inductance element 111, then, drive electrodes X1 the may control the drive electrode switching switch 112 to connect maintain simultaneously the inductance element 111 to drive electrodes X2, X3 which are adjacent to each other separately from the inductance element 111. This makes it possible to increase the sensitivity of the touch panel device 1. The touch panel device 1004 may also be operated in the same manner shown in FIG.

Further, the touch panel device 6 shown in FIG. 24A, connected maintain multiple X electrodes adjacent to each other among the plurality of X electrodes XS1 ~ XS6 XS1, XS2 simultaneously the inductance element 211a among the plurality of Y electrodes YS1 ~ YS6 each other adjacent the plurality of Y electrodes YS1, YS2 simultaneously connected maintain the inductance element 211b, then, electrodes XS1, YS1 inductance elements 211a, at the same time the inductance element 211a a plurality of X electrodes XS2, XS3 adjacent to each other separately from 211b electrode switching switch 212a to connect the plurality of Y electrodes adjacent to each other by connecting YS2, YS3 simultaneously the inductance element 211b, may be controlled 212b. This makes it possible to increase the sensitivity of the touch panel device 6. The touch panel device 6A shown in FIG. 24B may also be operated in the same manner.

In the above, may not be adjacent to each other are a plurality of electrodes are simultaneously selected.

In the above embodiment, 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 may not be alternating signal, may be another signal such as a DC signal.

In the second embodiment, the driving electrodes 104 and the detection electrode 102 is each electrode is divided electrodes at substantially the center portion of the extending direction, is not always necessary to divide the electrode in a substantially central portion of the electrode no it may divide the electrode at any position other than the substantially central portion in the direction of extension of the electrodes. Further, in consideration of the use state of the touch panel may be divided positions different in each electrode. Thus, for example, when dividing the drive electrodes, when the AC signal is transmitted to the drive electrode, the energy loss which is lost in the drive electrode maximally can be suppressed, it can be realized a highly sensitive touch panel device. Further, in the embodiments described above, divides the electrode into two, be divided into three or more electrodes, the same effect can be obtained.

Incidentally, the touch panel device in all embodiments above, may be a rectangular wave as AC signal. The resonant frequency of each electrode may vary for each electrode. In this case, when adopting the sine wave as the alternating current signal, significantly different and the frequency of the AC signal and the resonant frequency of each electrode, a lower electrode sensitivity may occur. Therefore, by using a rectangular wave having a frequency band occupied wider than the sine wave as the alternating current signal, even variations in the resonance frequency of each electrode, to prevent the frequency of the AC signal and the resonant frequency of each electrode is greatly different can.

The touch panel device according to the embodiment using a mutual capacitance type touch panel, the driving electrode (first electrode) 104 and the detection electrode and the touch panel 100 and a (second electrode) 102, the predetermined frequency of the AC signal the includes an AC signal source 110 to be input to the drive electrode 104, and the inductance element 111 that is electrically connected in series between the AC signal source 110 and the driving electrode 104, and a detection circuit 114. Detection circuit 114 detects the object may be detected by a change of the signal output of the change in capacitance between the detection electrode 102 driving electrode 104 at the time of touching on the surface of the touch panel 100 from the detection electrode 102 . Incidentally, the driving electrode 104 and detecting electrode 102 are mutually are arranged in galvanically insulated state.

For example, the touch panel device shown in Embodiment Modes 1 to 5, the driving electrodes 104 are arranged at substantially equal intervals in the X-axis direction (first direction), Y-axis direction perpendicular to the X-axis direction (second extends in direction), the detection electrode 102 (second electrode) are arranged at substantially equal intervals in the Y-axis direction, and extends in the X-axis direction. However, the configuration of the drive electrodes 104 and the detection electrode 102 need not be limited to this, the driving electrode 104 and detecting electrode 102 may be Mashimashi sequence and extend in any direction. Effect of Oeru touch panel device in Embodiment Modes 1 to 5, the arrangement direction and the extending direction of the driving electrodes 104 and the detection electrode 102 can be exhibited similarly be any. In the structure where the drive electrodes 104 and the detection electrode 102 is Zaisa sequence and extending in an arbitrary direction, the drive electrodes 104 and the detection electrode 102 is not only the case that a plurality of electrodes, one electrode also it includes a case consists of.

Further, as described above, when the arrangement direction and the extending direction of the driving electrodes 104 and the detection electrode 102 was an arbitrary direction, and the drive electrodes 104 (first electrode) and the detection electrode 102 (second electrode) both may be configured to be formed in the same layer of the touch panel 100. For example, as drive electrodes 104 and the detection electrodes 102 do not intersect with each other, when the arrangement direction of drive electrodes 104 and the detection electrodes 102, the extending direction is determined, the driving electrodes 104 on the same layer of the touch panel 100 and even if both of the detection electrodes 102 are formed, not be shorted together. Thus, both the electrodes of the drive electrode 104 and the detection electrode 102 by forming the same layers of the touch panel 100 can be simplified thickness and manufacturing process of the touch panel 100.

The touch panel device according to the embodiment using a mutual capacitance touch panel includes a touch panel 100 and the AC signal source 110 and the inductance element 111 and the detection circuit 114. The touch panel 100 is arranged at arbitrary intervals in the first direction, the drive electrodes 104 extending in a second direction different from the first direction (the first electrode), at any interval in a third direction are arranged, extending to the fourth direction that intersects a third different from the direction and the second direction and steric, oppositely disposed detecting electrode 102 across the driving electrodes 104 and the insulating layer (second electrode) having. AC signal source 110 inputs an AC signal of a predetermined frequency to the drive electrode 104. The inductance element 111 is electrically connected in series between the driving electrode 104 and an AC signal source 110. Detection circuit 114 detects the object is detected by a change of the signal output of the change in capacitance at the intersection between the detection electrode 102 driving electrode 104 at the time of touching on the surface of the touch panel 100 from the detection electrode 102. For example, the touch panel device shown in Embodiment Modes 1 to 5, the driving electrodes 104 are arranged at substantially equal intervals in the X-axis direction (first direction), Y-axis direction perpendicular to the X-axis direction (second extends in direction), the detection electrode 102 (second electrode) are arranged at substantially equal intervals in the Y-axis direction and extends in the X-axis direction, the driving electrodes 104 and the detection electrode 102 configuration does not need to be limited to this. Specifically, the extending direction of the drive electrode 104 (second direction) to the extending direction of the detection electrode 102 (fourth direction) is related to overpass, and a first direction second of different direction, and, if only meet the third direction and a fourth condition that the directions are different, the first, second, third and fourth direction may be freely selected. For example, the first direction and the third direction may be the same direction or to the first direction and the fourth direction may be the same direction or a second direction and the third direction There may be the same direction. Even first, second, third and fourth direction was such a relationship, the effect of the touch panel device according to the first to fifth embodiments can be exhibited similarly.

Incidentally, the touch panel device of the embodiment using the above-described mutual capacitance type touch panel, the drive electrodes 104 (first electrode) and the detection electrode 102 (second electrode) be both composed of a plurality of electrodes good. Its touch panel device, from among the plurality of drive electrodes 104, driving electrodes changeover switch 112 for selecting an electrode AC signal is input (first electrode changeover switch), is output from a plurality of detection electrodes 102 configuration with the detection electrode switching switch 113 (second electrode changeover switch) for selecting the electrodes to be detected in the signal detection circuit 114, a control circuit 115 for controlling the drive electrode switching switch 112 and the detection electrode switching switch 113 it may be. That is, the driving electrode switching switch 112 has a function of selecting the electrode AC signal from among a plurality of drive electrodes 104 is input, the detection electrode switching switch 113 from a plurality of detection electrodes 102, have a function of selecting the electrode signal output is detected at the detection circuit 114, it can be effective in the touch panel device of the embodiment using the above-described mutual capacitance type touch panel.

The touch panel device according to an embodiment using a self-capacitance type touch panel, a touch panel 200 having an X electrode 204 (first electrode) and the Y electrode 202 (second electrode), an AC signal of a predetermined frequency X comprises an AC signal source 210a to be input respectively to the electrodes 204 and Y electrodes 202, and 210 b, the inductance element 211a which is electrically connected in series between the AC signal source 210a and the X electrode 204, the detection circuit 114a, and 114b . Detection circuit 114a, 114b is a change in capacitance between the change or Y electrode 202 and the ground electrostatic capacitance between the X electrode 204 and the ground when the detection target has touched the surface of the touch panel 200 X detected by a change of the signal output from the electrode 204 and the Y electrode 202.. For example, the touch panel device 6 of the sixth embodiment, X electrodes 204 are arranged at substantially equal intervals in the X-axis direction (first direction), the Y-axis direction perpendicular to the X-axis direction (second direction) extends, Y electrodes 202 (second electrodes) are arranged at substantially equal intervals in the Y-axis direction and extends in the X-axis direction, the configuration of the X electrode 204 and Y electrode 202 which need not be limited to, X electrodes 204 and Y electrodes 202 may have Mashimashi sequence and extend in any direction. The effect of the touch panel device 6 in the sixth embodiment, the arrangement direction and the extending direction of the X electrode 204 and Y electrode 202 can be exhibited similarly be any. In the structure of the X electrode 204 and Y electrode 202 is Zaisa sequence and extend in any direction, the X electrodes 204 and Y electrodes 202, not only the case that a plurality of electrodes, only one also it includes the case consists of the electrodes. In this case, X electrode switching switch 212a in FIG. 24A, the Y electrode switching switch 212b becomes unnecessary.

Further, as described above, when the arrangement direction and the extending direction of the X electrode 204 and Y electrode 202 is an arbitrary direction, the X electrode 204 (first electrode) and the Y electrode 202 (second electrode) both may be configured to be formed in the same layer of the touch panel 200. For example, as X electrodes 204 and Y electrodes 202 do not intersect with each other, when the arrangement direction of the X electrodes 204 and Y electrodes 202, the extending direction is determined, the X electrode 204 and the same layer of the touch panel 200 even if both the Y electrode 202 is formed, not be shorted together. Thus, by forming the both electrodes of the X electrodes 204 and Y electrodes 202 in the same layer of the touch panel 200 can be simplified thickness and manufacturing process of the touch panel 200.

The touch panel device according to the embodiment using a self-capacitance type touch panel includes a touch panel 200 AC signal source 210a, 210b and the inductance element 211a, 211b and the detection circuit 214a, and 214b. The touch panel 200 is arranged at arbitrary intervals in a first direction, a plurality of X electrodes 204 extending in a second direction different from the first direction (the first electrode), optionally in a third direction are arranged at intervals, extending to the fourth direction that intersects the third and different and the second direction direction, a plurality of which are arranged opposite each other across the X electrode 204 insulating layer Y electrode 202 (second and an electrode). AC signal source 210a, 210b inputs the AC signal of a predetermined frequency to the X electrodes 204 and Y electrodes 202. Inductance element 211a is electrically connected in series between the AC signal source 210a and the X electrode 204. Inductance element 211b are electrically connected in series between the AC signal source 210a and the Y electrode 202. Detection circuit 214a, X a change in capacitance between 214b and the electrostatic capacitance changes or Y electrode 202 and the ground between the X electrode 204 and the ground when the detection target has touched the surface of the touch panel 200 detected by a change of the signal output from the electrode 204 and the Y electrode 202.. For example, the touch panel device 6 shown in the sixth embodiment, X electrodes 204 are arranged at substantially equal intervals in the X-axis direction (first direction), Y axis direction (a second direction perpendicular to the X-axis direction ) extends in, Y electrode 202 (second electrode) are arranged at substantially equal intervals in the Y-axis direction and extends in the X-axis direction, the configuration of the X electrode 204 and Y electrode 202 there is no need to be limited to this. Specifically, a relationship that the extending direction of the X electrode 204 (second direction) and the extending direction of the Y electrode 202 (fourth direction) crossing, and a first direction second of different direction, and, if only meet the third direction and a fourth condition that the directions are different, the first, second, third and fourth direction may be freely selected. For example, the first direction and the third direction may be the same direction or to the first direction and the fourth direction may be the same direction or a second direction and the third direction There may be the same direction. Even first, second, third and fourth direction was such a relationship, the effect of the touch panel device of the sixth embodiment are exhibited similarly.

Incidentally, the touch panel device of the embodiment using the above-described self-capacitance type touch panel, both may be constituted by a plurality of electrodes and the X electrodes 204 and Y electrodes 202. Its touch panel device includes a X electrode switching switch 212a for selecting an electrode for inputting an AC signal out of the plurality of X electrodes 204, and the Y electrode selector switch 212b for selecting an electrode for inputting an AC signal of the Y electrodes 202, X a configuration in which a control circuit 215 for controlling the electrode selector switch 212a and the Y electrode switching switch 212b may be. That, X electrode switching switch 212a from a plurality of X electrodes 204, has a function of selecting the electrode AC signal is input, Y electrode switching switch 212b from a plurality of Y electrodes 202 , have a function of selecting the electrode signal output is detected at the detection circuit 214, it is possible to exert the effects described in the embodiment using the above-described self-capacitance type touch panel.

Note that the first electrode (driving electrode 104 or the X electrode 204) of a touch panel device according to an embodiment using a self-capacitance type touch panel and a mutual capacitance type touch panel, the third electrode and the fourth electrode at any position It is divided into. Control circuit (115 or 215) is an AC signal source (110a, 110b or 210a) the first electrode switching as input from an AC signal in-phase or anti-phase simultaneously or alternately to the third electrode and a fourth electrode switch (drive electrode switching switch 112a, 112b or X electrode switching switch 212a) may be controlled. For example, the touch panel device shown in FIG. 14, the driving electrode 104 is divided into an arbitrary in the position the third electrode Xn1 and the fourth electrode Xn2 on the Y axis, but need not be limited to the Y-axis , for example, also in the touch panel device the extending direction of the drive electrode 104 is other than the Y-axis direction, it is possible to obtain the effect of the touch panel device shown in FIG. 14. Further, this configuration is not only mutual capacitance type touch panel, can be applied to self-capacitance type touch panel has the same effect. Specifically, in the embodiment using self-capacitance type touch panel shown in FIG. 24A, X electrodes 204 is divided into third and fourth electrodes at an arbitrary position in the Y-axis direction, X electrodes changeover switch 212a comprises a third electrode and a fourth electrode, it is configured to determine an electrical connection state between the AC signal source 210a and a detection circuit 214a, the effect of split electrodes 14 the can be exhibited in the same way.

The second electrode (detection electrode 102 and Y electrode 202) of a touch panel device according to an embodiment using a self-capacitance type touch panel and a mutual capacitance type touch panel, divided into the fifth and sixth electrodes at any position it may be. In this case, the control circuit (115 or 215) may be configured to control the second electrode switching switch to input to the detection circuit a signal output from the fifth electrode and the sixth electrode. For example, the touch panel device shown in FIG. 14, but the detection electrode 102 is divided into a fifth electrode Yn1 and sixth electrode Yn2 at any position in the direction of the X axis, it should be limited in the direction of the X axis no. For example, even in the touch panel device the extending direction of the detection electrode 102 is other than the X-axis direction, can be obtained the advantageous effect of the touch panel device shown in FIG. 14. Further, this configuration is not only mutual capacitance touch panel, it can be similarly applied to a touch panel device using a self-capacitance type touch panel. Specifically, in the embodiment using self-capacitance type touch panel shown in FIG. 24A, Y electrodes 202 may be divided into a fifth electrode and the sixth electrode at an arbitrary position in the direction of the X axis. In this case, Y electrode switching switch 212b is a fifth electrode and a sixth electrode, be configured to determine an electrical connection state between the AC signal source 210b and the detection circuit 214b, in FIG. 14 the effect of the divided electrodes shown can be exhibited similarly.

Incidentally, the touch panel device according to the embodiment, for convenience, have been shown the shape of the electrodes in rectangular, need not be limited to, the diamond shape being used in current touch panel device and backgammon shape be another shape etc., the same effect can be obtained.

Incidentally, in the embodiment, the capacitance between the "first electrode (X electrode) when the detection target has touched the surface of the touch panel or the second electrode (Y electrode), the ground and, change and a first electrode and detects "a change of the signal output from the second electrode, the electrostatic capacitance changes or the second electrode and the ground between the first electrode and the ground a change in capacitance between a case where the detection circuit from the change only of the signal output from the first electrode is detected, and if the detection circuit from the change only of the signal output from the second electrode to detect , detection circuit and a case of detecting the change of the first electrode and the second signal output from the both electrodes of the electrode. In the touch panel device 6 shown in FIG. 24A for example, if you enter the AC signal from the AC signal source 210a to X electrodes 204 (first electrode), between the change of the signal output from the X electrode 204 of the X electrode 204 and the ground the change in electrostatic capacitance detection circuit to 214a may be detected, and a change in electrostatic capacitance detection circuit 214b detects a period from the change of the signal output from the Y electrode 202 and the Y electrode 202 and the ground and it may be. Further, the detection circuit 214a and the detection circuit 214b, may detect a change in capacitance between the capacitance change and the Y electrode 202 and the ground between the X electrode 204 and the ground, respectively. If the AC signal source 210b enter the AC signal to the Y electrode 202 (second electrode) is the same.

Here, the inductance element according to the embodiment, points to a chip component or the like having an inductance component at the frequency of the AC signal, does not point to the 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 according to the first to fifth embodiments, the first electrode switching switch 112 and the second electrode transmission loss from the AC signal source 110 to the detection circuit 114 is maximum It is determined based on the resonance frequency of the electrodes in the combination of the connection state of the switch 113. Therefore, the combination of the first electrode and the second electrode transmission loss from the AC signal source 110 to the detection circuit 114 becomes the maximum, it can be optimized relationship of the frequency of the resonant frequency and the AC signal electrodes, the resonant current the order becomes possible to flow to the electrode, it is possible to detect the sensitivity of the touch panel device 1 is achieved sensitivity raised the most degraded electrodes. For example, the combination of the first electrode and the second electrode transmission loss from the AC signal source 110 to the detection circuit 114 is maximum, will be described an example in which the combination of electrode X3 and the electrode Y3 in FIG. That is, the electrodes X1, X2, X4 ~ X6, the electrodes Y1, Y2, Y4 ~ Y6 is a short circuit state with respect to ground, becomes the electrode X3 is the inductance element 111 and short-circuit state, a short circuit between the electrode Y3 detection circuit 114 so that state, when the first electrode switching switch 112 and the second electrode switching switch 113 is controlled by the control circuit 115, the transmission loss from the AC signal source 110 to the detection circuit 114 is maximum.

That is, in the touch panel device 1, by electrode switching switch 112 connects the one first electrode X3 and the inductance element 111 of the plurality of first electrodes X1 ~ X2, and the second electrode switching switch 113 connects the one second electrode Y3 and the detection circuit 114 of the plurality of second electrodes Y1 ~ Y2, without connecting the other of the first electrode X1, X2, X4 ~ X6 in the inductance element 111 connected to ground, the transmission loss from the AC signal source 110 when connected to the ground without connecting the other second electrodes Y1, Y2, Y4 ~ Y6 to the detection circuit 114 and the detection circuit 114 is maximum to . Transmission loss of the frequency of the AC signal source 110 from the AC signal source 110 to the detection circuit 114 is determined based on the resonance frequency of a certain first electrode X3 at which the maximum. For example, the frequency of the AC signal source 110 to the same as the resonance frequency.

Further, the touch panel device 6,6A shown in FIG. 24A and FIG. 24B, an AC signal source 210a, 210b is, for example, a certain first electrode XS3 a plurality of second of the plurality of first electrodes XS1 ~ XS6 the transmission loss of an AC signal into a certain second electrode YS3 of the electrodes YS1 ~ YS6 from the AC signal source 210a when the input to the detection circuit 214a is maximum, from the AC signal source 210b to the detection circuit 214b transmission loss is maximum. In this case, the frequency of the AC signal is determined based on the resonance frequency of a certain first electrode XS3. Frequency of the AC signal may be the same as the resonance frequency.

Here, the transmission loss between the points to transmission loss in the absence or the detection object in space to detect the detection target of the touch panel 100 near. Further, the transmission loss, when the AC signal output from the AC signal source 110 is input to the detection circuit 114, is input from the AC signal source 110 to the detection circuit 114 to the power level of the output AC signal AC It refers to the degree of reduction in the signal power level.

As described above, the control circuit 115 controls the first electrode switching switch 112 and the second electrode switching switch 113, when the combination of the electrode X3 and the electrode Y3 is selected, electrode AC signal is input X3 the resonance frequency and frequency f1. Here, when the frequency f1 the frequency of the AC signal, most transmission loss is large, in the combination of the electrode X3 and the electrode Y3 that could detection sensitivity of the touch panel drops, generates the contributing resonance current to the improvement of detection sensitivity it is thing. In this case, was the same as the resonance frequency f1 of the electrode X3 the frequency of the AC signal is not necessarily limited thereto, based on the resonance frequency f1, it may be selected frequencies near the resonance frequency f1. Conductivity such as a transparent electrode for low, the Q value of the electrode is not a very high value, even if slightly deviated from the resonance frequency of the electrodes, the current value of the AC signal flowing through the electrode is far from the resonance current at the resonance frequency reduction is not able to.

With this arrangement, an alternating signal inputted from the AC signal source is resonated by the resonant circuit formed by the stray capacitance of the inductance element and the electrode, it is possible to supply a large resonance current to the electrodes. Detection position accuracy and the detection sensitivity can be increased the intensity of the electric field generated from the touch panel by the resonance current can provide both high touch panel device.

The resonance frequency of each electrode, often differs in each electrode. This is because the length of the transmission path between the electrodes and the AC signal source is different, and the value of the stray capacitance at each electrode is also different for. Therefore, when the AC signal source made common frequency of the AC signal supplied to the respective electrodes at the same frequency, largely different and the frequency of the resonance frequency and the AC signal electrodes in some electrodes, to flow a large resonance current also occur when it is difficult. AC signal source of a touch panel device of the embodiment, the AC signal on the basis of the resonance frequency of the electrodes in the combination of the connection states of the first and second electrode switching switch transmission loss is maximum from the AC signal source to the detection circuit and determines the frequency of. Therefore, the combination of the first electrode and the second electrode transmission loss from the AC signal source to the detection circuit is maximum, it can optimize the relationship between the frequency of the resonant frequency and the AC signal electrodes, the resonance current since it is possible to flow to the electrode, it is possible to increase the sensitivity of the detection sensitivity is lowest electrode of a touch panel device.

The "resonance frequency" in the embodiment, the connection point of the inductance element 111 (111-1 to 111-6) and the AC signal source 110, the first electrode selector switch (drive electrode switching switch and X electrodes It refers a frequency of an imaginary component becomes zero input impedance when viewing the target electrode through the switch) or the second electrode switching switch (detecting electrode switching switch and the Y electrode change-over switch).

The frequency of the AC signal, in a combination of connection states of the first and second electrode switching switch 112 and 113 transmission loss from the AC signal source 110 to the detection circuit 114 is maximized, electrical and AC signal source 110 frequency of the determined by "or" AC signal based on the resonance frequency of the connected electrodes are from the AC signal source 110 detection circuit 114 until the transmission loss first electrode switching switch 112 and the second having a maximum of in combination with the connection state of the electrode switching switch 113, technical idea identity is ", and the resonance frequency of the AC signal source 110 and electrically connected to the electrode other than the mutual capacitance type touch panel apparatus in the first to fifth embodiments It can be adapted. Specifically, with respect to the self-capacitance type touch panel device described in Embodiment 6, the same technical ideas frequency of "AC signal, a plurality of first electrodes and a plurality of second electrodes frequency of among the AC signal source 110 transmission loss from is determined based on the resonance frequency of the electrodes with a maximum "or" AC signal, AC signal source among the plurality of first electrodes and a plurality of second electrodes by transmission loss from 110 is the same as the resonant frequency of the electrode having the largest "to adopt a configuration, the advantageous effect obtained by the mutual capacitance type touch panel device, be obtained also in self-capacitance type touch panel device can.

Figure 29A shows the frequency characteristic Q1, Q2 of the power of the signal propagating through the certain portion of the electrode X2 in the touch panel device 1 in the first to fifth embodiments shown in FIG. Figure 29B shows the power of the frequency characteristic Q1, Q2 of the signal propagating through certain portions of the electrode X2 in the touch panel device of the comparative example. In FIG 29A and FIG 29B, the vertical axis represents the power propagating the site of the electrode X2, the horizontal axis represents frequency. FIG detection object in the touch panel device 1 in the first to fifth embodiments shown in 3 of the touch panel 100 detectable range into a plurality of first in first state is a state where no electrodes X1 ~ X6 and plural second resonance frequency of a certain one of the electrodes in the second electrode Y1 ~ Y6 is the frequency f0. In this case, the frequency fb of the AC signal AC signal source 110 is output may not satisfy the relationship (7).

Figure JPOXMLDOC01-appb-M000007

With this structure, the inductance element 111 and the electrode Xm an AC signal input from the AC signal source 110, by resonating at a resonance circuit formed by the stray capacitance of Yn (1 ≦ m ≦ 6,1 ≦ n ≦ 6) it can flow a large resonance current electrode Xm, the Yn. Detection position accuracy and the detection sensitivity can be increased the intensity of the electric field generated from the touch panel by the resonance current can provide both high touch panel device 1.

In the touch panel device 1 shown in FIG. 3, the resonant frequency of the electrode X2 in the second state detection object is in a state of touching the surface of the touch panel 100 is a low frequency f1 than the frequency f0. As shown in FIG. 29A, the frequency fb of the AC signal is approximately the same as the resonance frequency f0 of the electrode X2 in the first state. The influence of the detection object such as the finger of the operator in the second state, the resonant frequency of the electrode X2 changes to low only variation Delta] f, the frequency f1. As a result, the power propagating through any site of the electrode X2 decreases greatly changed from the power P0 of the case of the first state to the power P1 in the case of the second state. Accordingly, the power of the signal output from each of the electrodes of the electrode Y1 ~ Y6 also become very different things in the first and second states. By detecting the amount of change in the power of the signal output from each of the electrodes of the electrode Y1 ~ Y6 in detection circuit 114, that the surface or object to be detected in the vicinity of the touch panel 100 detects whether the touch sensitivity can. Note that equation (7) satisfies the condition as far as, for example, be bring a difference in the power of the first state signal outputted from the electrode Y1 in the power and signal output from the electrode Y1 in the second state can, this is similarly applicable in the electrodes Y1 other electrodes Y2 ~ Y6.

On the other hand, the touch panel device of the comparative example shown in Figure 29B, the frequency fb of the AC signal is in between the resonance frequency f0, f1, a frequency of the frequency characteristic Q1, Q2 intersect. In this case, almost the same as the power P1 of the signal propagating through the site of the electrode X2 in the second state and the power P0 of the signal propagating through any site of the electrode X2 in the first state. As a result, for example, the difference between the power value of the signal output from the electrode Y1 in the power value and the second state of the signal output from the electrode Y1 in the first state is reduced. This can be said also in the electrode Y2 ~ Y6 other than the electrode Y1. Therefore, the surface or object to be detected in the vicinity of the touch panel 100 is difficult to detect whether the touch sensitivity. However, this situation, since the frequency fb of the resonance frequency f0 and the AC signal electrode X2 in the first state does not occur as long as it satisfies the relation of equation (7) satisfies the relation of equation (7) the touch panel device it is possible to detect with high sensitivity whether surface or object to be detected in the vicinity of the touch panel 100 is touched.

Frequency fb of the AC signal is a frequency lower than the resonance frequency f0 of the electrode Xm (1 ≦ m ≦ 6), and, in the case where the detection object is positioned near or touching the surface of the touch panel of the electrode Xm If it is equal to the resonance frequency f1, who situation detection target has touched the surface of the touch panel, the power of the signal detection target propagates electrode than situation that does not exist in the detectable range of the touch panel Ma times (Ma> 1) only increases. On the other hand, when the detection object touches the surface of the touch panel, the electrode Xm, Yn (1 ≦ n ≦ 6) part of the power of the signal to be propagated for leak detection object and the electrode Xm, the Yn power of propagating signal is 1 / Mb times. Here, if the Ma and Mb have the relationship of equation (8), the value of the signal output from the electrode Yn in the case where the detection object is touching the surface of the touch panel, the detection object is detected on the touch panel the difference between the value of the signal output from the electrode Yn in the absence in the range becomes small.

Figure JPOXMLDOC01-appb-M000008

When Ma and the Mb have the relationship of equation (8), since the electrode Xm by the detection object has touched the surface of the touch panel, and the decrease and increase of the signal propagating on Yn is offset, the electrode change the value of the signal output from Yn is not generated, the detection target can not be determined whether or not the touch surface of the touch panel.

In the touch panel device of the embodiment, the detection object is the resonance frequency f0 of the electrodes in the absence of the detectable range of the touch panel, and the frequency fb of the AC signal, satisfies the relation of equation (7). Thus, when the detection target has touched the surface of the touch panel is always a resonance frequency of the frequency fb of the AC signal electrodes f1 (the resonant frequency of the electrode Xm when detection target has touched the surface of the touch panel) Unlike a result, the power of the signal detection target propagates electrode Xm compared with a case that does not exist in the detectable range of the touch panel becomes small. In other words, Ma takes a value smaller than 1. Thus the touch panel device of Embodiment for not satisfying the equation (8), the value of the signal output from the second electrode Yn in the case where the detection object is touching the surface of the touch panel, the object to be detected the difference between the value of the signal output from the second electrode Yn in the absence in the detectable range of the touch panel becomes large. Therefore, it is possible to realize a touch panel device 1 high detection sensitivity of the detection object.

Figure 30A shows the signal normalization power frequency characteristics Qn1, Qn2 of propagating a certain site of the electrode X2 in the touch panel device 1 in the first to fifth embodiments shown in FIG. Figure 30B shows the frequency characteristic Qn1, Qn2 of the signal of the power propagating through certain portions of the electrode X2 in the touch panel device of the comparative example. In FIG 30A and FIG 30B, the vertical axis represents the normalized power propagating the site of the electrode X2, the horizontal axis represents frequency. Normalizing power is divided by the power value at the maximum value i.e. the resonance frequency of the power value of the power shown in FIG. 29A. In the touch panel device 1 according to the first to fifth embodiments, the resonance frequency f0, f1 and the frequency fb of the AC signal may be constituted by satisfying the relationship shown in equation (9).

Figure JPOXMLDOC01-appb-M000009

Frequency fb shown in FIG. 30A satisfies the relationship (9), further from the frequency f0 as compared to the frequency f1. In this case, when the changes from a first state to a second state, the normalized power of the signals propagating through any site of the electrode X2 changes from a normalized power Pn1 to normalize power Pn2. That is, by changing from a first state to a second state, the absolute value of the difference between the resonance frequency of the frequency fb and the electrode X2 of the AC signal increases from the difference Δf0 to the difference .DELTA.f1. More from the resonance frequency of the electrode X2 away the frequency fb of the AC signal, the power of the signals propagating through any site of the electrode X decreases. Therefore, the attenuation amount from the power value at the resonant frequency of a signal propagating through the site of the electrode X2 is is larger in the second state than in the first state. Here, further, since the power loss due to the proximity of the detection target is applied, the amount of change in the power value of a signal propagating through any site that by the electrode X2, which changes from a first state to a second state a large the things. Thus, the touch panel device relation frequency fb meets (9) of the AC signal with the resonance frequency f0, f1 has a high sensitivity for detecting the object.

On the other hand, the touch panel device of the comparative example shown in FIG. 30B, the frequency fb of the resonance frequency f0, f1 and an AC signal does not satisfy the relationship (9). In this case, by changing from a first state to a second state, the absolute value of the difference between the resonance frequency of the frequency fb and the electrode X2 of the AC signal is reduced from the difference Δf0 to the difference .DELTA.f1. That is, the attenuation amount from the power value at the resonant frequency of a signal propagating through any site of the electrode X2 is smaller towards than the first state of the second state. That is, with respect to the first state toward the second state, from the viewpoint of resonance, it is possible to propagate the more power to the electrode X2. When changing from a first state to a second state power loss caused by the proximity of the detection target is applied to the direction of the change and reverse, signal propagated through the electrode X2 is attenuated. Therefore, the touch panel device that does not satisfy the condition of equation (9) compared to the touch panel device which satisfies the condition (9), the detection sensitivity is lowered.

The relationship shown in FIG. 29A and FIG. 29B, can be applied in not without electrodes other than X2 electrode only the electrode X2. Further, these relationships are not only mutual capacitance type touch panel device according to the first to fifth embodiments, can also be similarly applied to the self-capacitance type touch panel described in Embodiment 6, the same effect can be obtained.

Moreover, the "detectable range" in the embodiment, the detection circuit of the touch panel device is pointing detectable range detection object.

Furthermore, the term "resonance frequency" in the embodiments, (refer to the driving electrode changeover switch and X electrode switching switch, etc.) from a connection point between the AC signal source of the inductance element, the first electrode changeover switch or the second electrode in the impedance characteristic when viewed target electrode through the switch (refer to the detection electrode switching switch and the Y electrode change-over switch, etc.) refers to the frequency at which the imaginary component is zero. Further, "the frequency of the alternating signal" in the embodiment may be different for each electrode. This allows the relationship between the resonance frequency f0, f1 of each electrode can be easily modified to so as to satisfy the equation (7) or (9).

Incidentally, the resonance frequency of the one electrode of the plurality of first electrodes and a plurality of second electrodes when the "detection target is not present in the detection range of the touch panel 100 when the f0, of the AC signal frequency fb is the resonance of the plurality of first electrodes and a plurality of second one of the electrodes in the electrode when a is satisfying the relationship "or" detection object does not exist in the detectable range of the touch panel 100 (7) when the frequency is f0, the resonant frequency of the one electrode of the plurality of first electrodes and a plurality of second electrodes in a case where the detection object has touched the surface of the touch panel 100 and the f1, the AC signal frequency fb can be adaptable in addition to mutual capacitance type touch panel device technical idea of ​​satisfying "the relationship shown in the first to fifth embodiments of (9). Specifically, with respect to the self-capacitance type touch panel device described in Embodiment 6, it is possible to obtain the advantageous effects obtained by the mutual capacitance type touch panel device as well.

(Embodiment 10)
Figure 31 is a block diagram of a touch panel device 2001 according to the tenth embodiment. In Figure 31, the same portions as the touch panel device 1 according to the first embodiment shown in FIG. 3 are denoted by the same reference numbers. The touch panel device 2001 further includes a variable capacitor 150a that electrically to the inductance element 111 are connected in series between the AC signal source 110 and the driving electrode changeover switch 112. In the touch panel device 2001, the variable capacitor 150a is connected in series between the AC signal source 110 and the inductance element 111.

By adjusting the capacitance value of the variable capacitor 150a for each electrode electrically connected to an AC signal source 110 of the electrode X1 ~ X6, possible to generally designed to the same value the resonance frequency of the electrodes X1 ~ X6 it is possible. As a result, the frequency of the AC signal output from the AC signal source 110, by fixing near its resonant frequency, it is possible to supply a large resonance current to the electrodes X1 ~ X6. Control of the capacitance value of the variable capacitor 150a is performed by the control circuit 115. The control circuit 115 checks the connection status of at least the driving electrode switching switch 112, recognizes the electrodes are electrically connected to an AC signal source 110 of the electrodes X1 ~ X6, is its electrical connection for shifting the resonant frequency of the electrode to the vicinity of the frequency of the output signal of the AC signal source 110 adjusts the capacitance value of the variable capacitor 150a to a desired value. Capacitance value of the variable capacitor 150a needed to shift to near the frequency of the output signal of the AC signal source 110 to the resonance frequency of each electrode is conserved in correspondence to each electrode in the storage unit of the control circuit 115 it may be. In Figure 31, only switch TSW3 driving electrode changeover switch 112 is electrically connected to an AC signal source 110 side, i.e. only the electrode X3 of the electrode X1 ~ X6 is electrically connected to an AC signal source 110 there. At this time, the control circuit 115 reads the capacitance value corresponding to the electrode X3 stored in the storage unit, the capacitance value of the variable capacitor 150a a control signal for adjusting the capacitance value thus read out to the variable capacitor 150a Send. The capacity value of the variable capacitor 150a stored in the storage unit, not only those corresponding to the connection to the drive electrode switching switch 112, the combination of the connection state of the drive electrode switching switch 112 and the detection electrode switching switch 113 it may set the capacitance value in response to. Further, in FIG. 31, but it is only the electrode X3 What is electrically connected to an AC signal source 110, two or more electrodes AC signal source 110 at the same time of the touch panel device 2001 in electrodes X1 ~ X6 it may be electrically connected. In this case, in a state in which a plurality of electrodes are electrically connected to an AC signal source 110, the capacitance value of the variable capacitor 150a so that the resonance frequencies of the plurality of electrodes is frequency near the output signal of the AC signal source 110 is It is adjusted. That is, the optimal capacitance value of the variable capacitor 150a corresponding to the combination of a plurality of electrodes that are selected from among the electrodes X1 ~ X6, the control circuit 115 holds the storage unit. Thus, the conductivity of equivalently electrodes by combining multiple electrode increases, since the resonance current can be supplied to the combined electrodes, it is possible to significantly improve the sensitivity of the touch panel device 2001 .

Note that in FIG. 31, but are electrically connected in series between the variable capacitor 150a is AC signal source 110 and the inductance element 111, between the variable capacitor 150a is the inductance element 111 and the driving electrode switching switch 112 electrically well be connected in series, it is possible to obtain the same effect. Further, the variable capacitor 150a may be integrated with the control circuit 115. Further, the variable capacitor 150a may be formed by the same semiconductor process and control circuit 115. Thus, it is possible to realize the inexpensive touch panel device 2001 compact.

Figure 32 is a block diagram of another touch panel device 2002 according to the tenth embodiment. In Figure 32, components identical to those of the touch panel device 2001 shown in FIG. 31 are denoted by the same reference numbers. The touch panel device 2002 shown in FIG. 32 includes a variable capacitor 150b in place of the variable capacitor 150a of the touch panel device 2001 shown in FIG. 31. Variable capacitor 150b is not electrically connected in series between the AC signal source 110 and the inductance element 111, and an AC signal source 110 and the inductance element 111 between the AC signal source 110 and the inductance element 111 is connected are electrically connected in series between the connection point 1150b and ground are. Any touch panel device 2002 shown in FIG. 32, a combination of the capacitance values ​​of the inductance and the variable capacitor 150b of the inductance element 111, it is possible to obtain the same advantageous effect as the touch panel device 2001 of FIG. 32. Rather than a connection point 1150b between one end of the variable capacitor 150b in FIG. 32 is the inductance element 111 and the AC signal source 110, the inductance element 111 and the driving electrode switching switch 112 between the inductance element 111 and the driving electrode switching switch 112 Doo is be connected to a connection point 2150b that is connected, it is possible to obtain the same advantageous effect as the touch panel device 2002 shown in FIG. 32.

Figure 33 is a further block diagram of another touch panel device 2003 according to the tenth embodiment. In Figure 33, components identical to those of the touch panel device 2001 and 2002 shown in Figures 31 and 32 are denoted by the same reference numbers. The touch panel device 2003 shown in FIG. 33, a capacitor 142a ~ 142f having a fixed capacitance instead of the variable capacitor 150a, 150b shown in Figures 31 and 32. Used, connected in series between the capacitors 142a ~ 142f and the electrodes X1 ~ X6 and the drive electrode switching switch 112. The capacitance of the capacitor 142a ~ 142f, by adjusting for each electrode X1 ~ X6 capacitor 142a ~ 142f are connected, it is possible to design the resonance frequency of the electrodes X1 ~ X6 substantially the same value. By fixing the frequency of the AC signal output from the AC signal source 110 near its resonant frequency, it is possible to supply a large resonance current to each electrode. In the touch panel device 2003, the control circuit 115 since it is not necessary to control the capacitance value of the capacitor, it is possible to simplify the structure of the touch panel device 2003. In the touch panel device 2003 shown in FIG. 33, electrodes X1 ~ X6 are electrically connected with capacitors 142a ~ 142f. At least one of the electrodes X1 ~ X6 may not be electrically connected to the capacitor. Electrode which is not connected to the capacitor to resonate with the frequency f1 by the inductance of the inductance element 111, it is possible to resonate with the frequency f1 in that connected in series a capacitor between the drive electrode switching switch 112 in the case of other electrode .

In the touch panel device 2003 shown in FIG. 33, 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.

Figure 34 is a further block diagram of another touch panel device 2004 according to the tenth embodiment. In Figure 34, components identical to those of the touch panel device 2003 shown in FIG. 33 are denoted by the same reference numbers. The touch panel device 2004 shown in FIG. 34, a capacitor 143a ~ 143 f instead of the capacitors 142a ~ 142f of the touch panel device 2003 shown in FIG. 33. Each electricity between the capacitor 143a ~ 143 f the driving electrodes X1 ~ X6 and the drive electrode connection point 1143a ~ 1143f and the ground, the driving electrodes X1 ~ X6 and drive electrode switching switch 112 is connected between the changeover switch 112 They are connected in series basis. In such a configuration, a combination between the capacitance value of the inductance and the capacitor 143a ~ 143 f of the inductance element 111, it is possible to obtain the same advantageous effect as the touch panel device 2003 shown in FIG. 33.

Figure 35 is a block diagram of yet another touch panel device 3006 according to the tenth embodiment. In Figure 35, components identical to those of self-capacitance type touch panel device 6 of the sixth embodiment shown in FIG. 24A are denoted by the same reference numbers. The touch panel device 3006 further includes a variable capacitor 250a, the 250b. Variable capacitor 250a is electrically connected in series between the between the AC signal source 210a and the inductance element 211a or inductance element 211a and the X electrode switching switch 212a,. That is, the variable capacitance capacitor 250a is electrically connected in series and the inductance element 211a between the AC signal source 210a and the X electrode switching switch 212a. Variable capacitor 250b is provided between the AC signal source 210b and the inductance element 211b or, are electrically connected in series between the inductance element 211b and the Y electrode switching switch 212b. That is, the variable capacitance capacitor 250b are connected in series the inductance element 211b electrically between the AC signal source 210b and the Y electrode switching switch 212b.

The resonance frequency of each electrode, often differs in each electrode. This is also the reason the length of the transmission line between the respective electrodes and the AC signal source is different, and the value of the stray capacitance at each electrode is also different for. Therefore, when the AC signal source 110 in common the frequency of an AC signal supplied to the respective electrodes at the same frequency, largely different and the frequency of the resonance frequency and the AC signal electrodes in some electrodes, supply a large resonance current also occur when things are difficult.

In mutual capacitance type touch panel device 3006 shown in FIG. 35, by adjusting for each X electrode is electrically connected to an AC signal source 210a the capacitance value of the variable capacitor 250a, the resonance frequency of the electrodes XS1 ~ XS6 generally it is possible to design to the same value. As a result, by fixing the frequency of the AC signal output from the AC signal source 210a to the frequency near the resonance frequency, it is possible to supply a large resonance current to each electrode. Control of the capacitance value of the variable capacitor 250a is performed by the control circuit 215. Control circuit 215, after recognizing at least a connection state confirmation X electrode switching switch 212a, the X electrode that is electrically connected to an AC signal source 210a of the plurality of X electrodes, the resonant frequency of the electrode for shifting to the frequency near the output signal of the AC signal source 210a, to adjust the capacitance value of the variable capacitor 250a to a desired value. Capacitance value of the variable capacitor 250a needed to shift to near the frequency of the output signal of the AC signal source 210a and the resonant frequency of each electrode is stored in a manner corresponding to each electrode in the storage unit of the control circuit 215 and it may be. The capacity value of the variable capacitor 250a stored in the storage unit, not only those corresponding to the connection to the X electrode switching switch 212a, the combination of the connection state of the X electrode switching switch 212a and the Y electrode switching switch 212b it may set the capacitance value against. The touch panel device 3006 may also be electrically connected to an AC signal source 210a has two or more electrodes at the same time. In this case, in a state in which a plurality of electrodes are electrically connected to an AC signal source 210a, the capacitance value of the variable capacitor 250a so that the resonance frequencies of the plurality of electrodes is frequency near the output signal of the AC signal source 210a is It is adjusted. That is, the optimal capacitance value of the variable capacitor 250a corresponding to a combination of a plurality of electrodes that are selected from among the electrodes XS1 ~ XS6, control circuit 215 may be held in the storage unit. Thus, equivalently conductivity of the electrode is increased by coupling the plurality of electrodes, since it is possible to flow a resonance current to the combined electrodes, can significantly improve the sensitivity of the touch panel device 3006 Become. Variable capacitor 250b is similar effect behave like variable capacitor 250a to the Y electrodes YS1 ~ YS2 are obtained.

Note that in FIG. 35, although the variable capacitor 250a is electrically connected in series between the AC signal source 210a and the inductance element 211a, while the variable capacitor 250a is the inductance element 211a and the X electrode switching switch 212a electrically be connected in series, it is possible to obtain the same effect. Similarly, in FIG. 35, although the variable capacitor 250b are electrically connected in series between the AC signal source 210b and the inductance element 211b, the variable capacitor 250b is the inductance element 211b and the Y electrode switching switch 212b be electrically connected in series between, it is possible to obtain the same effect.

Further, the variable capacitor 250a, at least one of the 250b, may be integrated with the control circuit 215. Further, the variable capacitor 250a, at least one of the 250b, may be formed by the same semiconductor process and control circuit 215. Thus, it is possible to realize the inexpensive touch panel device 3006 compact.

The touch panel device 3006 may not include variable capacitors 250a, 250b to one of the.

Figure 36 is a block diagram of yet another touch panel device 3007 according to the tenth embodiment. In Figure 36, components identical to those of the touch panel device 3006 shown in FIG. 35 are denoted by the same reference numbers. The touch panel device shown in FIG. 36 3007, includes variable capacitors 250c, the 250d instead of the variable capacitor 250a, 250b of the touch panel device 3006 shown in FIG. 35. Variable capacitor 250c are electrically connected in series between the connection point 1250c and ground AC signal source 210a and the inductance element 211a is connected between the AC signal source 210a and the inductance element 211a. Variable capacitor 250d are electrically connected in series between the connection point 1250d and ground AC signal source 210b and the inductance element 211b is connected between the AC signal source 210b and the inductance element 211b.

In the touch panel device 3007 shown in FIG. 36, a combination of the capacitance values ​​of the inductance and the variable capacitor 250c of the inductance element 211a, and, by a combination of inductance and capacitance of the variable capacitor 250d of the inductance element 211b, the touch panel device of FIG. 35 it is possible to obtain the advantageous effects similar to 3006.

Variable capacitor 250c rather than connection points 1250c, electrical between the connection point 2250c and the ground in which the inductance element 211a and the X electrode switching switch 212a between the inductance element 211a and the X electrode switching switch 212a is connected to be connected in series, it is possible to obtain the same advantageous effect as the touch panel device 3007 shown in FIG. 36. Similarly, the variable capacitor 250d rather than connection point 1250D, between the inductance element 211b and the Y electrode connection point 2250d and ground and the inductance element 211b and the Y electrode switching switch 212b is connected between the changeover switch 212b electrically be connected in series, it is possible to obtain the same advantageous effect as the touch panel device 3007 shown in FIG. 36.

Figure 37 is a block diagram of yet another touch panel device 3008 according to the tenth embodiment. In Figure 37, components identical to those of the touch panel device 3006 and 3007 shown in FIG. 35 and FIG. 36 are denoted by the same reference numbers. The touch panel device 3008 shown in FIG. 37, a capacitor 242a ~ 2421 having a fixed capacitance instead of the variable capacitor 250a ~ 250d shown in FIGS. 35 and 36. Capacitors 242a ~ 242f are electrically connected in series respectively between each and the X electrode switching switch 212a of the electrodes XS1 ~ XS6. Capacitor 242 g ~ 2421 are electrically connected in series between each and the Y electrode switching switch 212b of electrodes YS1 ~ YS6. By adjusting the capacitance of the capacitor 242a ~ 242f for each X electrodes XS1 ~ XS6, it is possible to design the resonance frequency of the electrodes XS1 ~ XS6 substantially the same value. By fixing the frequency of the AC signal output from the AC signal source 210a to the frequency near the resonance frequency, it is possible to supply a large resonance current to the electrodes XS1 ~ XS6. Similarly, the capacitance of the capacitor 242 g ~ 2421, by adjusting for each Y electrode YS1 ~ YS6, it is possible to design the resonance frequency of the electrodes YS1 ~ YS6 substantially the same value. By fixing the frequency of the AC signal output from the AC signal source 210b to a frequency near the resonance frequency, it is possible to supply a large resonance current to the electrodes YS1 ~ YS6.

In the touch panel device 3008, since there is no need to control the capacitance value of the capacitor by the control circuit 215, it is possible to simplify the structure. In the touch panel device 3008, electrodes XS1 ~ XS6, YS1 ~ YS6 capacitors 242a respectively ~ 242f, but are 242 g ~ 2421 electrically connected, electrodes XS1 ~ XS6, YS1 ~ at least one of the YS6 capacitor electrodes may not be electrically connected. The electrode is not connected to the capacitor, it is resonated to the inductance element 211a of the inductance or inductance element inductance, for example, by the frequency f1 of the 211b, a capacitor between the X electrode switching switch 212a or Y electrode switching switch 212b in the case of other electrode it is possible to resonate with the frequency f1 by being connected in series.

The capacitor 242a ~ 2421 may be a variable capacitance capacitor. In this case, the control circuit 215 by controlling the capacitance value of the variable capacitor 242a ~ 2421, AC signal source 210a of the electrode, can be resonated at the frequency of the AC signal output of 210b.

Figure 38 is a configuration diagram of a touch panel device 3009 according to the tenth embodiment. In Figure 38, components identical to those of the touch panel device 3008 shown in FIG. 37 are denoted by the same reference numbers. The touch panel device 3009 shown in FIG. 38, a capacitor 243a ~ 243L in place of the capacitors 242a ~ 2421 of the touch panel device 3008 shown in FIG. 37. Capacitors 243a ~ 243 f is, X electrodes XS1 ~ the respective and the X electrode X electrodes XS1 ~ respectively X electrode switching switch 212a and is connected to the connection point 1243a ~ 1243f and ground XS6 between the changeover switch 212a of XS6 It is electrically connected in series between. Capacitor 243 g ~ 243L is, Y electrodes YS1 ~ the respective and the Y electrode Y electrodes YS1 ~ respectively Y electrode switching switch 212b and is connected to the connection point 1243g ~ 1243l and ground YS6 between changeover switch 212b of YS6 It is electrically connected in series between. In the touch panel device 3009, the combination of the inductance of each and the inductance elements 211a of the capacitance of the capacitor 243a ~ 243 f, and, in combination with the inductance of each inductance element 211b of the capacitance of the capacitor 243 g ~ 243L, shown in FIG. 37 it is possible to obtain an advantageous effect similar to the touch panel device 3008.

In the touch panel device 2001 ~ 2004,3006 ~ 3009 shown in FIGS. 31 to 38 according to the tenth embodiment, by connecting the reactance element such as a capacitor between the electrodes and the AC signal source, variations in the resonance frequency of each electrode the smaller, but the structure of the touch panel device may reduce variations in the resonant frequency of each electrode. For example, you can reduce variations in the value of the stray capacitance between each electrode and the ground of the touch panel 100, 200, or by the AC signal source or to reduce variations in electrical length to the electrodes, the resonance of each electrode it is possible to suppress the variation of the frequency.

The "resonance frequency", from the connection point between the AC signal source of the inductance element, the first electrode (refer to a drive electrode switching switch and X electrode switching switch) change-over switch or the second electrode selector switch (detection in the impedance characteristic when viewed target electrode through the point to the electrode switching switch and Y electrode change-over switch, etc.) refers to the frequency at which the imaginary component is zero. Also, the input stage of the detection circuit is a filter is provided for removing noise. The filter has a pass band generally can pass the frequency of the AC signal AC signal source is output.

Incidentally, Figures 31 and 32, FIG. 35, the touch panel device 2001,2002,3006,3007 shown in FIG. 36, the variable capacitor 150a is selected according to the state of the drive electrode switching switch 112 or the detection electrode switching switch 113, 150b, the capacitance value of 250a ~ 250d are pre-recorded prior to use in the storage unit of the control circuit 115, but is not limited to such a configuration. During use of the touch panel device 2001,2002,3006,3007, control circuit 115 may be recorded in the storage unit to measure the capacitance value required to resonate for each electrode. After the control circuit 115 as a method of measuring a capacitance value which is necessary for resonating each electrode, which controls the drive electrode switching switch 112 and the detection electrode switching switch 113 to a state in which an AC signal is supplied to the electrode to be measured , by sweeping the capacitance value of the variable capacitor, a method of obtaining a capacitance value when the value of the signal detected in the detection circuit 114 becomes maximum it can be considered. Thereby, the state of the touch panel device is changed from the factory, even if the resonant frequency of each electrode had changed, it is possible to select the element values ​​of the optimum variable capacitor for each electrode, a long period of time It can be achieved a touch panel device capable of maintaining a high and stable sensitivity.

Incidentally, the touch panel device according to the tenth embodiment, the connection point between the but inductance element is electrically connected in series between the AC signal source and the electrodes is not limited to this, the AC signal source and the electrodes It is electrically connected in series between the ground and has the same effect.

(Embodiment 11)
AC signal source 110 of the touch panel device 1 according to the first to fifth embodiments are each made different frequencies of the alternating current signal to be input to the at least two electrodes of the plurality of first electrodes X1 ~ X6. For example, in FIG. 3, the operation of the touch panel device 1 when having different frequencies of the alternating current signal to be input to the two electrodes X1, X6 of the plurality of first electrodes X1 ~ X6, hereinafter, be described. The "resonance frequency", from the connection point between the AC signal source of the inductance element, the first electrode (refer to a drive electrode switching switch and X electrode switching switch) change-over switch or the second electrode selector switch (detection in the impedance characteristic when viewed target electrode through the point to the electrode switching switch and Y electrode change-over switch, etc.) refers to the frequency at which the imaginary component is zero. Also, the input stage of the detection circuit filter is provided for removing noise, the filter has a pass band that can pass through substantially the frequency of the AC signal.

In the touch panel device 1 in FIG. 3, when the drive electrode switching switch 112 is sequentially electrically connecting the AC signal source 110 and each of the electrodes X1 ~ X6, the electrical length of the signal line from the AC signal source 110 to the electrode X1 It is longer than the electrical length of the signal path from the AC signal source 110 to the electrode X6. The resonant frequency of each electrode also changes from the AC signal source 110 by an electrical length of the signal line to each electrode, the resonant frequency of the electrode X1 is lower than the resonant frequency of the electrode X6. In this state, when the frequency of the AC signal AC signal source 110 is output is the same as the resonant frequency of the electrode X1, there is a case where the frequency of the resonance frequency and the AC signal electrode X6 is greatly different. As a result, it becomes difficult to flow a resonance current on the electrode X6, the detection sensitivity of the detection object using the electrode X6 decreases greatly as compared with the case of using the electrode X1. The touch panel device 1 in the eleventh embodiment, are different from each other the frequency of the AC signal inputted to the frequency and the electrodes X6 AC signal input to the electrode X1. For example, the same as the resonant frequency of the electrode X1 of the AC signal input to the electrode X1, the frequency of the AC signal input to the electrode X6 is identical to the resonance frequency of the electrodes X6. With this configuration, the touch panel device 1 according to the eleventh embodiment can avoid a situation in which the detection sensitivity of the electrode X6 to detection sensitivity of the electrode X1 is remarkably deteriorated. In this example, the frequency of the AC signal input to each of the electrodes was the same as the resonance frequency of each electrode, the frequency of the AC signal input to each electrode is not limited to this, at a frequency near the resonance frequency of each electrode no problem, if any. Further, in the different frequencies of the alternating current signal inputted to the electrode X1 and the electrode X6 each other but may be different from each other the frequency of the AC signal inputted to the other two electrodes and three or more electrodes, similar effect can be obtained. Varying the frequency of the AC signal by the electrodes to be input is not only mutual capacitance type touch panel apparatus in the first to fifth embodiments, equally applicable to self-capacitance type touch panel device according to the sixth embodiment. In this case, the same effect that different from each other the frequency of the AC signal input to the at least two electrodes of the plurality of first electrodes and a plurality of second electrodes is obtained.

Incidentally, in the case where the different frequency of the AC signal input to the at least two electrodes of the touch panel device 1 according to the first to fifth embodiments, a plurality of first electrodes (electrodes X1 ~ X6) is an AC signal source 110 it may switch the frequency of the AC signal input to one electrode of the plurality of first electrodes in time. Similarly, inputs to at least two electrodes of the touch panel device 6,6A in the sixth embodiment, a plurality of first electrodes (electrodes XS1 ~ XS6) and a plurality of second electrodes (electrodes YS1 ~ YS6) AC when varying the frequency of the signal, the AC signal source 110a, 110b can be switched the frequency of the AC signal input to one electrode of the plurality of first electrodes and a plurality of second electrodes in time good. If the ambient environment of the temperature of the touch panel 100 is changed, there is a possibility that the resonant frequency of the electrode changes, the result, although the frequency of the AC signal inputted resonant frequency of the electrode and its electrodes are significantly different fear, by selecting the appropriate frequency of the AC signal in response to environmental changes, it is possible to realize a high detection sensitivity touch panel device. If the change in the resonance frequency of the temporally electrode has been obtained in advance, the AC signal source may change the frequency of the AC signal in consideration of the variation.

Further, as shown in FIGS. 31 to 38, a touch panel device may further comprise an environmental sensor 901, such as a temperature sensor for detecting the ambient environment of the touch panel device. In this case, to determine the frequency of the AC signal based on the output value from the environment sensor 901. In this case, by storing the correlation data between the output value of the resonance frequency and the environmental sensors 901 of the electrode advance, it is possible to determine the frequency of the AC signal based on the output value from the environment sensor 901.

Incidentally, the AC signal source 110 detects the resonant frequency of at least one electrode of the plurality of first electrodes X1 ~ X6, may determine the frequency of the AC signal on the basis of the detected resonance frequency. Also, the AC signal source 110a, 110b includes at least one detecting the resonant frequency of the electrode, based on the detected resonant frequency of the plurality of first electrodes XS1 ~ XS6 and a plurality of second electrodes YS1 ~ YS6 it may be used to determine the frequency of the AC signal to. AC power source 110 (110a, 110b, 210a, 210b), for example, the frequency of the AC signal input to each of the electrodes by transitioning, the detection circuit 114 (114a, 114b, 214a, 214b) is a voltage value detected by most the higher becomes the frequency can be detected as a resonance frequency of the electrodes. AC signal source 110 (110a, 110b) may be detected resonance frequency of each electrode at the start of the touch panel device, also, after the activation of the touch panel device, it may repeat the detection of the resonant frequency for each predetermined time period. After starting the AC signal source for each predetermined time period 110 (110a, 110b) By detects the resonance frequency of each electrode, as the resonant frequency of each electrode varies temporally, from time to time, the frequency of the appropriate AC signal selected, it is possible to input to each electrode. In determining the frequency of the basis of the resonance frequency of each detected electrode AC signal input to each electrode, for example, the frequency of the AC signal are the same or periphery value thereof and the resonance frequency of each electrode is selected. The resonance frequency of each electrode was measured at the time of manufacture of the touch panel device, stores the measured resonance frequency to the control circuit 115, an AC power source 110 (110a, 110b) is based on the recorded resonance frequency the frequency of the AC signal input to each electrode may be determined.

In the touch panel device according to the above embodiment, it may be used a signal of the sine wave as the alternating current signal. If there is a possibility that the resonant frequency of each electrode varies, in general, a signal having a broadband frequency component of the rectangular wave or the like is used as an AC signal. However, the touch panel device according to the above embodiment, based on the resonance frequency of each electrode, since it is possible to determine the frequency of the appropriate AC signal for each electrode, by using a sinusoidal signal as an AC signal , it is possible to increase the amplitude of the signal detected by the detection circuit. On the other hand, it may be used a signal of rectangular wave as AC signal. Compared with the sine wave signal, for the circuit that generates a signal of a rectangular wave is a simplified, it is possible to reduce the circuit scale of the AC signal source.

The touch panel device of the present invention, a mobile terminal, a personal computer, is widely applicable to a touch panel device, such as those used in the ATM terminal.

1,2,3,6 touch panel device 100,120,121,200,221,222 touch panel 102 detects the electrode (second electrode)
103 glass layer (insulating layer)
104 driving electrode (first electrode)
106 shield layer 107 liquid crystal display device (image display device)
110,110a, 110b, 210a, 210b AC signal source 111,111b, 111-1 ~ 111-6,140,211a, 211b inductance element 112, 112a, 112b drive electrode switching switch (first electrode changeover switch)
113, 113a, 113b detection electrode switching switch (second electrode changeover switch)
114,114a, 114b, 214a, 214b detection circuit 115, 215 control circuit 141 capacitor 202 Y electrodes (second electrodes)
204 X electrode (first electrode)
212a X electrode switching switch (first electrode changeover switch)
212b Y electrode change-over switch (second electrode changeover switch)
901 Environmental sensors X1 ~ X6 driving electrode (first electrode)
Y1 ~ Y6 detection electrodes (second electrode)
Xm1 (1 ≦ m ≦ 6) driving electrode (third electrode)
Xm2 (1 ≦ m ≦ 6) driving electrode (fourth electrode)
Yn1 (1 ≦ n ≦ 6) detecting electrode (third electrode, the fifth electrode)
Yn2 (1 ≦ n ≦ 6) detecting electrode (fourth electrode, the sixth electrode)
XS1 ~ XS6 X electrode (first electrode)
YS1 ~ YS6 Y electrode (second electrode)

Claims (25)

  1. A touch panel having a plurality of first electrodes and a plurality of second electrodes,
    An AC signal source for inputting the AC signal to the plurality of first electrodes,
    An inductance element that is electrically connected in series between respectively the AC signal source of the plurality of first electrodes,
    The change in the signal detected object is outputted from the plurality of first electrodes and the second electrodes changes in the capacitance of the plurality of between the plurality of second electrodes at the time of touching the touch panel and a detection circuit to be detected,
    First electrode changeover switch for switching between short and open states of the state of connection with each of the inductance elements of said plurality of first electrodes,
    A second electrode changeover switch for switching between an open state and the short-circuit state a connection state between the detection circuit respectively, respectively and the plurality of second electrodes,
    A control circuit for controlling said first electrode switching switch and the second electrode selector switch,
    A variable capacitor wherein is an inductance element and electrically connected in series between said ac signal source first electrode changeover switch,
    Touch panel device provided with.
  2. A touch panel having a plurality of first electrodes and a plurality of second electrodes,
    An AC signal source for inputting the AC signal to the plurality of first electrodes,
    An inductance element that is electrically connected in series between respectively the AC signal source of the plurality of first electrodes,
    The change in the signal detected object is outputted from the plurality of first electrodes and the second electrodes changes in the capacitance of the plurality of between the plurality of second electrodes at the time of touching the touch panel and a detection circuit to be detected,
    First electrode changeover switch for switching between short and open states of the state of connection with each of the inductance elements of said plurality of first electrodes,
    A second electrode changeover switch for switching between an open state and the short-circuit state the connection state with each of the detection circuit of the plurality of second electrodes,
    A control circuit for controlling said first electrode switching switch and the second electrode selector switch,
    Electrically in series between one connection point and the ground of the connection point between the first electrode changeover switch connection point and said inductance element between the AC signal source and the inductance element a variable capacitor connected,
    Touch panel device provided with.
  3. A touch panel having a plurality of first electrodes and a plurality of second electrodes,
    An AC signal source for inputting the AC signal to the plurality of first electrodes,
    A plurality of inductance elements electrically respectively connected in series between the AC signal source and the plurality of first electrodes,
    The change in the signal detected object is outputted from the plurality of first electrodes and the second electrodes changes in the capacitance of the plurality of between the plurality of second electrodes at the time of touching the touch panel and a detection circuit to be detected,
    First electrode changeover switch for switching between a connection state open a short-circuited state of said plurality of first electrodes and the plurality of inductance elements,
    A second electrode changeover switch for switching between an open state and the short-circuit state a connection state between the plurality of second electrodes wherein the detection circuit,
    A control circuit for controlling said first electrode switching switch and the second electrode selector switch,
    A plurality of capacitors in which the plurality of inductance elements and electrically respectively connected in series between respectively the first electrode switching switch of the plurality of first electrodes,
    Touch panel device provided with.
  4. A touch panel having a plurality of first electrodes and a plurality of second electrodes,
    An AC signal source for inputting the AC signal to the plurality of first electrodes,
    An inductance element that is electrically connected in series between the AC signal source and the plurality of first electrodes,
    The change in the signal detected object is outputted from the plurality of first electrodes and the second electrodes changes in the capacitance of the plurality of between the plurality of second electrodes at the time of touching the touch panel and a detection circuit to be detected,
    First electrode changeover switch for switching between an open state and the short-circuit state a connection state between the plurality of first respective, respectively and the inductance element of the electrode,
    A second electrode changeover switch for switching between an open state and the short-circuit state a connection state between the detection circuit respectively, respectively and the plurality of second electrodes,
    A control circuit for controlling said first electrode switching switch and the second electrode selector switch,
    A plurality of capacitors electrically respectively connected in series between a plurality of connection points and ground between each said first electrode changeover switch of the plurality of first electrodes,
    Touch panel device provided with.
  5. A touch panel having a plurality of first electrodes and a plurality of second electrodes,
    An AC signal source for inputting the AC signal to the plurality of first electrodes and the plurality of second electrodes,
    An inductance element that is electrically connected in series between respectively the AC signal source of the plurality of first electrodes,
    Capacitance between each and the ground of the second electrode of the change or the plurality electrostatic capacitance between each and ground of the plurality of first electrodes upon detection target has touched the touch panel change, a detection circuit for detecting a change of the signal output from the plurality of first electrodes and the plurality of second electrodes,
    First electrode changeover switch for switching between short and open states of the state of connection with each of the inductance elements of said plurality of first electrodes,
    A second electrode changeover switch for switching between an open state and the short-circuit state a connection state between the AC signal source and the plurality of second electrodes,
    A control circuit for controlling said first electrode switching switch and the second electrode selector switch,
    A variable capacitor wherein is an inductance element and electrically connected in series between said ac signal source first electrode changeover switch,
    Touch panel device provided with.
  6. A touch panel having a plurality of first electrodes and a plurality of second electrodes,
    An AC signal source for inputting the AC signal to the plurality of first electrodes and the plurality of second electrodes,
    An inductance element that is electrically connected in series between respectively the AC signal source of the plurality of first electrodes,
    Capacitance between each and the ground of the second electrode of the change or the plurality electrostatic capacitance between each and ground of the plurality of first electrodes upon detection target has touched the touch panel change, a detection circuit for detecting a change of the signal output from the plurality of first electrodes and the plurality of second electrodes,
    First electrode changeover switch for switching between short and open states of the state of connection with each of the inductance elements of said plurality of first electrodes,
    A second electrode changeover switch for switching between an open state and the short-circuit state the connection state between the respective, respectively and the AC signal source of the plurality of second electrodes,
    A control circuit for controlling said first electrode switching switch and the second electrode selector switch,
    Electrically in series between one connection point and the ground of the connection point between the first electrode changeover switch connection point and said inductance element between the AC signal source and the inductance element a variable capacitor connected,
    Touch panel device provided with.
  7. A touch panel having a plurality of first electrodes and a plurality of second electrodes,
    An AC signal source for inputting an AC signal of a predetermined frequency to the plurality of first electrodes and the plurality of second electrodes,
    An inductance element that is electrically connected in series between respectively the AC signal source of the plurality of first electrodes,
    Detection target of the electrostatic capacitance between each and the ground of the second electrode of the capacitance change or the plurality between each and ground of the plurality of first electrodes upon the touch panel touched change, a detection circuit for detecting a change of the signal output from the plurality of first electrodes and the plurality of second electrodes,
    First electrode changeover switch for switching between an open state and the short-circuit state a connection state between the plurality of first respective, respectively and the inductance element of the electrode,
    A second electrode changeover switch for switching between an open state and the short-circuit state a connection state between the AC signal source and the plurality of second electrodes,
    A control circuit for controlling said first electrode switching switch and the second electrode selector switch,
    A plurality of capacitors electrically connected in series respectively between said first electrode changeover switch respectively respective and of the plurality of first electrodes,
    Touch panel device provided with.
  8. A touch panel having a plurality of first electrodes and a plurality of second electrodes,
    An AC signal source for inputting the AC signal to the plurality of first electrodes and the plurality of second electrodes,
    An inductance element that is electrically connected in series between respectively the AC signal source of the plurality of first electrodes,
    Change in capacitance between the detection object is the second electrode and the ground of the capacitance change or the plurality between each and ground of the plurality of first electrodes at the time of touching the touch panel and a detection circuit for detecting a change of the signal output from the plurality of first electrodes and the plurality of second electrodes,
    First electrode changeover switch for switching between short and open states of the state of connection with each of the inductance elements of said plurality of first electrodes,
    A second electrode changeover switch for switching between an open state and the short-circuit state the connection state with each of the AC signal source of the plurality of second electrodes,
    A control circuit for controlling said first electrode switching switch and the second electrode selector switch,
    A plurality of capacitors electrically connected in series respectively between the ground and at a plurality of connection points between each said first electrode changeover switch of the plurality of first electrodes,
    Touch panel device provided with.
  9. A touch panel having a first electrode and a second electrode,
    An AC signal source for inputting the AC signal to the first electrode,
    An inductance element that is electrically connected in series between said ac signal source first electrode,
    A detection circuit for detecting object is detected by a change of the signal output of the change in capacitance from the second electrode between the first electrode and the second electrode at the time of touching the touch panel,
    Equipped with a,
    Resonance frequency of the one electrode in the first electrode and the second electrode when the detection object does not exist in the detectable range of the touch panel is a frequency f0,
    Frequency fb of the AC signal and the resonance frequency f0 satisfies the following relationship, the touch panel device.
    Figure JPOXMLDOC01-appb-M000010
  10. A touch panel having a first electrode and a second electrode,
    An AC signal source for inputting the AC signal to the first electrode,
    An inductance element that is electrically connected in series between said ac signal source first electrode,
    A detection circuit for detecting object is detected by a change of the signal output of the change in capacitance from the second electrode between the first electrode and the second electrode at the time of touching the touch panel,
    Equipped with a,
    Resonance frequency of the one electrode in the first electrode and the second electrode when the detection object does not exist in the detectable range of the touch panel is a frequency f0,
    Resonance frequency of the one electrode in the first electrode and the second electrode when the detection target has touched the surface of the touch panel is a frequency f1,
    Frequency fb of the AC signal and the frequency f0 and the frequency f1 satisfies the following relationship, the touch panel device.
    Figure JPOXMLDOC01-appb-M000011
  11. A touch panel having a first electrode and a second electrode,
    An AC signal source for inputting the AC signal to the first electrode and the second electrode,
    An inductance element that is electrically connected in series between said ac signal source first electrode,
    It said first electrode a change in capacitance between the change or the second electrode and the ground electrostatic capacitance between the first electrode and the ground when the detection target has touched the touch panel a detection circuit for detecting a change of the signal output from said second electrode and,
    Equipped with a,
    Resonance frequency of the one electrode in the first electrode and the second electrode when the detection object does not exist in the detectable range of the touch panel is a frequency f0,
    Frequency fb of the AC signal and the frequency f0 satisfies the following relationship, the touch panel device.
    Figure JPOXMLDOC01-appb-M000012
  12. A touch panel having a first electrode and a second electrode,
    An AC signal source for inputting the AC signal to the first electrode and the second electrode,
    An inductance element that is electrically connected in series between said ac signal source first electrode,
    It said first electrode a change in capacitance between the change or the second electrode and the ground electrostatic capacitance between the first electrode and the ground when the detection target has touched the touch panel a detection circuit for detecting a change of the signal output from said second electrode and,
    Equipped with a,
    Resonance frequency of the one electrode in the first electrode and the second electrode when the detection object does not exist in the detectable range of the touch panel is a frequency f0,
    Resonance frequency of the one electrode in the first electrode and the second electrode when the detection target has touched the touch panel is a frequency f1,
    Frequency fb of the AC signal and the frequency f0 and the frequency f1 satisfies the following relationship, the touch panel device.
    Figure JPOXMLDOC01-appb-M000013
  13. A touch panel having a plurality of first electrodes and a plurality of second electrodes,
    An AC signal source for inputting the AC signal to the plurality of first electrodes,
    An inductance element that is electrically connected in series between respectively the AC signal source of the plurality of first electrodes,
    The change in the signal detected object is outputted from the plurality of first electrodes and the second electrodes changes in the capacitance of the plurality of between the plurality of second electrodes at the time of touching the touch panel and a detection circuit to be detected,
    Equipped with a,
    The frequency of the AC signal input to the at least two electrodes of the plurality of first electrodes are different from each other, the touch panel device.
  14. A touch panel having a plurality of first electrodes and a plurality of second electrodes,
    An AC signal source for inputting the AC signal to the plurality of first electrodes and the plurality of second electrodes,
    An inductance element that is electrically connected in series between the AC signal source and the plurality of first electrodes,
    Capacitance between each and the ground of the second electrode of the change or the plurality electrostatic capacitance between each and ground of the plurality of first electrodes upon detection target has touched the touch panel change, a detection circuit for detecting a change of the signal output from the plurality of first electrodes and the plurality of second electrodes,
    Equipped with a,
    The frequency of the AC signal input to the at least two electrodes of the plurality of first electrodes and the plurality of second electrodes are different from each other, the touch panel device.
  15. The AC signal source switches the frequency of the AC signal input to one electrode of the plurality of first electrodes in time, the touch panel device according to claim 13 or claim 14.
  16. Further comprising an environmental sensor for detecting the ambient environment of the touch panel,
    The AC signal source determines the frequency of the alternating signal to be input to the one electrode of the plurality of first electrodes on the basis of the detected ambient environment, the touch panel device according to claim 15.
  17. The AC signal source to detect the resonant frequency of at least one first electrode of the plurality of first electrodes, determining the frequency of the AC signal on the basis of the detected resonance frequency, claim 13 or the touch panel device according to claim 14.
  18. Wherein the frequency of the AC signal input to the at least two electrodes, respectively, wherein is determined based on the resonance frequency of the at least two electrodes, the touch panel device according to claim 13 or claim 14.
  19. The AC signal is a sine wave, a touch panel device according to claim 13 or claim 14.
  20. The AC signal is a rectangular wave, a touch panel device according to claim 13 or claim 14.
  21. A touch panel having a plurality of first electrodes and a plurality of second electrodes,
    An AC signal source for inputting the AC signal to the plurality of first electrodes,
    An inductance element that is electrically connected in series between respectively the AC signal source of the plurality of first electrodes,
    The change in the signal detected object is outputted from the plurality of first electrodes and the second electrodes changes in the capacitance of the plurality of between the plurality of second electrodes at the time of touching the touch panel and a detection circuit to be detected,
    First electrode changeover switch for switching between short and open states of the state of connection with each of the inductance elements of said plurality of first electrodes,
    A second electrode changeover switch for switching between an open state and the short-circuit state the connection state with each of the detection circuit of the plurality of second electrodes,
    A control circuit for controlling said first electrode switching switch and the second electrode selector switch,
    Equipped with a,
    The frequency of the alternating signal is determined on the basis of the connection state of the first electrode switching switch and the second electrode selector switch,
    The AC signal source switches the frequency of the AC signal input to one electrode of the plurality of first electrodes in time, the touch panel device.
  22. A touch panel having a plurality of first electrodes and a plurality of second electrodes,
    An AC signal source for inputting an AC signal of a predetermined frequency to the plurality of first electrodes,
    An inductance element that is electrically connected in series between respectively the AC signal source of the plurality of first electrodes,
    Detection object is outputted from the second electrode a change in capacitance of said plurality between each respective said plurality of second electrodes of the plurality of first electrodes at the time of touching the touch panel a detection circuit for detecting a change in that signal,
    First electrode changeover switch for switching between short and open states of the state of connection with each of the inductance elements of said plurality of first electrodes,
    A second electrode changeover switch for switching between an open state and the short-circuit state the connection state with each of the detection circuit of the plurality of second electrodes,
    A control circuit for controlling said first electrode switching switch and the second electrode selector switch,
    Equipped with a,
    The first electrode switching switch connects the one first electrode of the plurality of first electrodes and the inductance element, and the second electrode switching switch of the plurality of second electrodes transmission loss when the ones of the one second electrode was connected to the said detection circuit from the AC signal source to the detection circuit is maximum,
    The predetermined frequency, said first electrode switching switch connects the one first electrode of the plurality of first electrodes and the inductance element, and the second electrode switching switch said plurality It is determined based on the resonance frequency of the certain first electrode when one has a second electrode connected between the detection circuit of the second electrode of a touch panel device.
  23. Wherein the predetermined frequency is equal to the resonant frequency, the touch panel device according to claim 22.
  24. A touch panel having a plurality of first electrodes and a plurality of second electrodes,
    An AC signal source for inputting an AC signal having a predetermined frequency and a second electrode wherein the plurality of first electrodes of the plurality,
    An inductance element that is electrically connected in series between respectively the AC signal source of the plurality of first electrodes,
    Wherein a change in capacitance between the second electrode and the ground of a change or the plurality capacitance between the plurality of first electrodes and the ground when the detection target has touched the touch panel a detection circuit for detecting a change of the signal output from the plurality of first electrodes and the plurality of second electrodes,
    Equipped with a,
    Wherein when said AC signal source, and inputs the AC signal into a certain second electrode of the one first electrode and the plurality of second electrodes of the plurality of first electrode transmission loss from the AC signal source to said detection circuit is maximum,
    The predetermined frequency is determined based on the resonance frequency of the certain first electrode, a touch panel device.
  25. Frequency of the AC signal is the same as the resonance frequency, the touch panel device according to claim 24.
PCT/JP2012/007182 2011-11-11 2012-11-08 Touch-panel device WO2013069290A1 (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015049821A (en) * 2013-09-04 2015-03-16 アルパイン株式会社 Position detection apparatus
CN104423688A (en) * 2013-09-03 2015-03-18 新唐科技股份有限公司 Sensing device
CN104503627A (en) * 2015-01-14 2015-04-08 京东方科技集团股份有限公司 Touch structure, touch display panel and touch display device
JP2015115021A (en) * 2013-12-16 2015-06-22 株式会社ジャパンディスプレイ Display device with touch detection function, and electronic apparatus
JP2016099897A (en) * 2014-11-25 2016-05-30 株式会社ジャパンディスプレイ Display device and touch detection method
US9501169B2 (en) 2014-06-27 2016-11-22 Synaptics Incorporated Acquiring multiple capacitive partial profiles with orthogonal sensor electrodes
JP2017091490A (en) * 2015-11-10 2017-05-25 ハイマックス テクノロジーズ リミテッド In-cell touch display panel
US9703430B2 (en) 2014-06-30 2017-07-11 Synaptics Incorporated Driving sensor electrodes for proximity sensing

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58182744A (en) * 1982-04-20 1983-10-25 Fujitsu Ltd Coordinate detector
JPS605324A (en) * 1983-06-23 1985-01-11 Fujitsu Ltd Appointed position detecting device
JPH11143626A (en) * 1997-11-10 1999-05-28 Sharp Corp Coordinate input device
JP2009192306A (en) * 2008-02-13 2009-08-27 Wacom Co Ltd Position detecting device
JP2009244958A (en) * 2008-03-28 2009-10-22 Sony Corp Display device with touch sensor
WO2010133070A1 (en) * 2009-05-21 2010-11-25 智点科技(深圳)有限公司 Touch-control flat panel display and driving circuit thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58182744A (en) * 1982-04-20 1983-10-25 Fujitsu Ltd Coordinate detector
JPS605324A (en) * 1983-06-23 1985-01-11 Fujitsu Ltd Appointed position detecting device
JPH11143626A (en) * 1997-11-10 1999-05-28 Sharp Corp Coordinate input device
JP2009192306A (en) * 2008-02-13 2009-08-27 Wacom Co Ltd Position detecting device
JP2009244958A (en) * 2008-03-28 2009-10-22 Sony Corp Display device with touch sensor
WO2010133070A1 (en) * 2009-05-21 2010-11-25 智点科技(深圳)有限公司 Touch-control flat panel display and driving circuit thereof

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104423688A (en) * 2013-09-03 2015-03-18 新唐科技股份有限公司 Sensing device
US9898123B2 (en) 2013-09-03 2018-02-20 Nuvoton Technology Corporation Sensing device
JP2015049821A (en) * 2013-09-04 2015-03-16 アルパイン株式会社 Position detection apparatus
CN104423759A (en) * 2013-09-04 2015-03-18 阿尔派株式会社 Location detection device
US9600126B2 (en) 2013-09-04 2017-03-21 Alpine Electronics, Inc. Location detection device
JP2015115021A (en) * 2013-12-16 2015-06-22 株式会社ジャパンディスプレイ Display device with touch detection function, and electronic apparatus
US9678599B2 (en) 2014-06-27 2017-06-13 Synaptics Incorporated Acquiring multiple capacitive partial profiles for interleaved capacitive sensing
US9501169B2 (en) 2014-06-27 2016-11-22 Synaptics Incorporated Acquiring multiple capacitive partial profiles with orthogonal sensor electrodes
US9703430B2 (en) 2014-06-30 2017-07-11 Synaptics Incorporated Driving sensor electrodes for proximity sensing
JP2016099897A (en) * 2014-11-25 2016-05-30 株式会社ジャパンディスプレイ Display device and touch detection method
US9965121B2 (en) 2014-11-25 2018-05-08 Japan Display Inc. Display and touch detection method
WO2016112672A1 (en) * 2015-01-14 2016-07-21 京东方科技集团股份有限公司 Touch structure, touch display panel and touch display device
CN104503627A (en) * 2015-01-14 2015-04-08 京东方科技集团股份有限公司 Touch structure, touch display panel and touch display device
JP2017091490A (en) * 2015-11-10 2017-05-25 ハイマックス テクノロジーズ リミテッド In-cell touch display panel

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