TWI575430B - Mutual-capacitance input device with hovering touch - Google Patents

Description

Suspension sensing mutual capacitance input device

The invention relates to the technical field of a touch panel, and more particularly to a mutual induction input device for suspension sensing.

With the rapid spread of smart phones and tablets, the demand for hover gestures has gradually emerged following touch input and multi-finger gestures. The hover detection device has been widely used on different smart phones to increase the added value of smart phones. The suspension detecting device can detect the proximity, the distance, the position and the moving direction of the object within a certain distance when the object is not touched. However, commercial floating gesture detection devices are mostly optical photography or infrared scanning methods, which often have hand shadow problems, ambient light interference and energy consumption concerns, which are not conducive to the application of mobile devices.

Projected capacitive touch has the advantages of energy saving, long service life, simple structure and easy product design, and is especially suitable for mobile electronic devices. In the capacitive sensing method of the projected capacitive touch panel, it is generally divided into a self-capacitance type and a mutual capacitance type. The conventional self capacitance sensing method in FIG. 1 is connected to a driving and sensing circuit simultaneously on the same conductor line. 110, 120, after driving the conductor line, the same conductor line is sensed by the amount of change of the signal to determine the size of the self-inductance capacitor.

Another capacitive touch panel driving method is to sense the change of the mutual capacitance (Cm) to determine whether an object is close to the touch panel. Similarly, the mutual sensing capacitance (Cm) is not a physical capacitance. It is a mutual induction capacitance (Cm) between the conductor line in the first direction and the conductor line in the second direction. 2 is a schematic diagram of a conventional mutual induction capacitance (Cm) sensing. As shown in FIG. 2, the driver 210 is disposed in a first direction (Y), and the sensor 220 is disposed in a second direction (X). During the first half of the first time period T1, the driver 210 drives the conductor line 230 in the first direction, and uses the voltage Vy_1 to charge the mutual induction capacitor (Cm) 250. During the second half of the first time period T1, all the sensing is performed. The device 220 senses the voltages (Vo_1, Vo_2, ..., Vo_n) on the conductor lines 240 in all the second directions to obtain n data, and after m driving cycles, mxn data can be obtained.

The conventional projected capacitive touch panel technology only inks the detection of multi-touch on the touch panel, and still cannot perform the floating induction. Therefore, there is still room for improvement in the conventional projected capacitive touch panel.

The purpose of the present invention is mainly to provide a floating-inductance mutual capacitive input device, which can implement the floating sensing detection technology in a projected capacitive touch input device.

According to a feature of the present invention, the present invention provides a mutual induction input device for suspension sensing, comprising a plurality of transmitting electrodes and a plurality of receiving An electrode, a touch sensing signal source, at least one first amplifier having a gain greater than zero, a first selection switch circuit, and a second selection switch circuit. The touch sensing signal source generates a touch sensing signal of at least one frequency and is coupled to the plurality of transmitting electrodes via the first selection switch circuit. The first selection switch circuit is connected to the plurality of emitter electrodes, the touch sensing signal source, and the at least one first amplifier having a gain greater than zero, and the first selection switch circuit sequentially couples the touch sensing signals At least one of the plurality of emitter electrodes is coupled to the plurality of emitter electrodes, and the plurality of emitter electrodes other than the selected at least one emitter electrode are coupled to a capacitor cancellation signal. The second selection switch circuit is coupled to the plurality of receiving electrodes and the at least one first amplifier having a gain greater than zero, and the second selection switch circuit sequentially couples the sensing signals on the at least one receiving electrode of the plurality of receiving electrodes to At least one first amplifier having a gain greater than zero to generate the capacitor cancellation signal and coupling the capacitance cancellation signal to the first selection switch circuit.

According to another feature of the present invention, the present invention provides a mutual induction input device for suspension sensing, comprising a plurality of transmitting electrodes, a plurality of receiving electrodes, a touch sensing signal source, a selection switching circuit, a plurality of reflective deflection electrodes, And a plurality of amplifiers whose gain is greater than zero. The touch sensing signal source generates a touch sensing signal of at least one frequency and is coupled to the plurality of transmitting electrodes via the selection switch circuit. The selection switch circuit is connected to the plurality of transmitting electrodes and the touch sensing signal source, and the selection switch circuit sequentially transmits the touch sensing signals to at least one of the plurality of transmitting electrodes. Each of the plurality of reflective deflecting electrodes has a reflective biasing electrode corresponding to one of the plurality of transmitting electrodes pole. Each of the plurality of amplifiers having a gain greater than zero corresponds to a transmitting electrode to transmit an electrical signal on the corresponding transmitting electrode to the reflective deflecting electrode corresponding to the transmitting electrode via the second amplifier.

110, 120‧‧‧ drive and sensing circuits

210‧‧‧ drive

220‧‧‧ sensor

230‧‧‧Conductor wire

240‧‧‧ conductor wire

250‧‧‧ mutual induction capacitor

300‧‧‧suspension induction mutual capacitance input device

330‧‧‧Touch sensing signal source

350‧‧‧First selection switch circuit

360‧‧‧Second selection switch circuit

310, 310-1, 310-2, ..., 310-m‧‧‧ transmitting electrodes

320, 320-1, 320-2, ..., 320-n‧‧‧ receiving electrodes

340, 340-1, 340-2, ..., 340-n‧‧‧ first amplifier

370‧‧‧Reflective deflection electrode

380, 380-1, 380-2, ..., 380-m‧‧‧ second amplifier

1200, 1300‧‧‧suspension induction mutual capacitance input device

1250‧‧‧Select switch circuit

FIG. 1 is a schematic diagram of a conventional self-induced capacitance sensing.

FIG. 2 is a schematic diagram of a conventional mutual induction capacitance sensing.

3 is a schematic diagram of a mutual capacitive input device for suspension sensing of the present invention.

4 is an equivalent circuit diagram of a receiving electrode RX of FIG. 3 of the present invention.

FIG. 5 is another schematic diagram of the mutual induction input device of the suspension induction of the present invention.

FIG. 6 is still another schematic diagram of the mutual induction input device of the suspension induction of the present invention.

FIG. 7A is a schematic diagram of a conventional mutual capacitance touch sensing operation.

Figure 7B is a cross-sectional view taken along line AA' of Figure 7A.

Fig. 8A is a schematic view showing the operation principle of the mutual induction input device of the suspension induction of the present invention.

Figure 8B is a cross-sectional view taken along line BB' of Figure 8A.

FIG. 9 is still another schematic diagram of the mutual induction input device of the suspension induction of the present invention.

Figure 10 is a cross-sectional view taken at CC' in Figure 9.

Figure 11 is an equivalent circuit diagram of a receiving electrode RX of Figure 6 of the present invention.

Figure 12 is a further schematic view of the mutual induction input device of the suspension induction of the present invention.

Figure 13 is a further schematic view of the mutual induction input device of the suspension induction of the present invention.

3 is a schematic diagram of a mutual sensing capacitive input device 300 of the present invention. The mutual capacitive input device 300 includes a plurality of transmitting electrodes 310, a plurality of receiving electrodes 320, a touch sensing signal source 330, at least one first amplifier 340 having a gain greater than zero, a first selection switch circuit 350, and a first The second selection switch circuit 360.

The plurality of transmitting electrodes 310 are arranged in a first direction (X), and the plurality of receiving electrodes 320 are arranged in a second direction (Y) to sense a touch or proximity of an external object. The first direction (X) and the second direction (Y) are substantially perpendicular to each other. The shape of each of the plurality of emitter electrodes 310 and the plurality of receiver electrodes 320 is one of the following: a polygon, a circle, a triangle, a rectangle, a diamond, a wedge, a square, or a tandem of the above shapes. In the present embodiment, a rectangle is taken as an example for illustration.

The touch sensing signal source 330 generates a touch sensing signal of at least one frequency and is coupled to the plurality of transmitting electrodes 310 via the first selection switch circuit 350.

The first selection switch circuit 350 is coupled to the plurality of transmissions The electrode 310, the touch sensing signal source 330, and the at least one first amplifier 340 having a gain greater than zero. The first selection switch circuit 350 sequentially selects the touch sensing signals to be transmitted to at least one of the plurality of transmitting electrodes 310, and selects a plurality of transmitting electrodes other than the selected at least one transmitting electrode. Connect to receive a capacitor offset signal (Sig).

The second selection switch circuit 360 is coupled to the plurality of receiving electrodes 320 and the at least one first amplifier 340 having a gain greater than zero. The second selection switch circuit 360 sequentially outputs the sensing signals on the at least one receiving electrode of the plurality of receiving electrodes to the at least one first amplifier 340 having a gain greater than zero to generate the capacitor offset signal (Sig), and Output to the first selection switch circuit. The gain of the first amplifier 340 having at least one gain greater than zero is preferably one.

In the prior art, when the touch sensing signal is connected to the transmitting electrode 310-1 from the signal source 330 and sensed by the receiving electrode 320-1, the other transmitting electrodes (310-2, ..., 310-m) are used. There is a capacitance between the receiving electrode 320-1 and the receiving electrode 320-1, which forms a large background capacitance, which is not conducive to sensing a small change in the sensing capacitance between the transmitting electrode 310-1 and the receiving electrode 320-1. However, in the present invention, as shown in FIG. 3, when the touch sensing signal is output to the transmitting electrode 310-1 and the signal is sensed by the receiving electrode 320-1, the second selecting switch circuit 360 receives the receiving electrode 320- The sensed signal Sen1 is output to the at least one first amplifier 340 having a gain greater than zero to generate the capacitor offset signal (Sig). At this time, the first selection switch circuit 350 will select a plurality of transmitting electrodes (310-2, . . . , 310-m) other than the selected at least one transmitting electrode (310-1). Connect to receive the capacitor offset signal (Sig). Since the signals on the transmitting electrodes 310-2, ..., 310-m are the same as the receiving signals of the receiving electrode 320-1, the transmitting electrodes 310-2, ..., 310-m have the same as the receiving electrodes 320-1. The potential (AC), so the capacitance effect between the emitter electrodes 310-2, ..., 310-m and the receiving electrode is cancelled, no longer a heavy burden of sensing, nor a receiving electrode as in the prior art 320-1 produces noise interference. The gain of the first amplifier 340 having at least one gain greater than zero is preferably one.

4 is an equivalent circuit diagram of a receiving electrode RX in FIG. As shown in Figure 4, , ,... C _eq1 C _eq2 C _eq3 ... C _eqn . Therefore, C _total = C _eq1 + C _eq2 + C _eq3 + ... + C _eqn + C _RG + C _FG = n × C _eq1 + C _RG + C _FG . Since the present invention uses the at least one first amplifier 340 having a gain greater than zero to generate the capacitor cancellation signal (Sig) from the signal Sen1 sensed by the receiving electrode 320-1, and outputs it to the transmitting electrodes 310-2, . 310-m, so the transmitting electrodes 310-2, ..., 310-m have the same potential (AC) as the receiving electrode 320-1, so C ₂ = C ₃ = C ₄ = ... = C _n = 0, so C _eq2 =C _eq3 =C _eq4 =...=C _eqn =0, so C _total =C _eq1 +C _RG +C _FG . It can be seen from the formula that the proportion of C _FG is greatly increased, so the detection sensitivity is also greatly improved.

FIG. 5 is another schematic diagram of a floating induction mutual capacitance input device 300 of the present invention. The main difference from FIG. 3 is that the at least one first amplifier 340 having a gain greater than zero is moved between the plurality of receiving electrodes 320 and the second selection switch circuit 360, and the number thereof is changed to n, where n is The number of the plurality of receiving electrodes 320. The at least one first amplifier 340 having a gain greater than zero can slow down the signal Sen1 sensed by the receiving electrode 320-1. After being amplified and amplified, it is output to the second selection switch circuit 360 to compensate for the attenuation of the sensed signal Sen1 during transmission.

FIG. 6 is still another schematic diagram of a floating induction mutual capacitance input device 300 of the present invention. The main difference from FIG. 5 is that a plurality of reflective deflecting electrodes 370 are added and a plurality of second amplifiers 380 having a gain greater than zero are added.

Each of the plurality of reflective deflecting electrodes 370 has a reflective deflecting electrode corresponding to one of the plurality of transmitting electrodes 310. Each of the reflective deflecting electrodes 370 is disposed on one side of the corresponding transmitting electrode 310, and the area of the reflective deflecting electrode 370 is not less than the area of the transmitting electrode 310. That is, if the plane in which the plurality of receiving electrodes 320 are located is regarded as the upper layer, the plane in which the plurality of transmitting electrodes 310 are located is the middle layer, and the plane in which the plurality of reflective deflecting electrodes 370 are located is the lower layer. The reflective deflecting electrode 370 is located below the transmitting electrode 310, so that a part of it is covered by the transmitting electrode 310.

Each of the plurality of second amplifiers 380 having a gain greater than zero corresponds to one of the transmitting electrodes 310 to transmit an electrical signal on the corresponding transmitting electrode 310 to the transmitting electrode 310 via the second amplifier 370. Corresponding to this reflection bias electrode 370. The gain of the at least one first amplifier 340 having a gain greater than zero and the second amplifier of the plurality of second amplifiers 380 having a gain greater than zero are respectively programmable. The gain value of the second amplifier 380 is preferably one.

The plurality of emitter electrodes 310, the plurality of receiver electrodes 320, and the plurality of reflective deflection electrodes 370 are made of a conductive material. The conductive material is one of the following: chromium, bismuth, aluminum, silver, copper, titanium, nickel, ruthenium, cobalt, tungsten, magnesium (Mg), calcium (Ca), potassium (K), lithium (Li), indium (In), molybdenum, alloy, indium tin oxide (ITO), IZO, ZnO, GZO, MG (OH) 2, conductive polymer, carbon nanotube, graphene, nanowire, lithium fluoride (LiF ), magnesium fluoride (MgF2), and lithium oxide (Li2O).

FIG. 7A is a schematic diagram of a conventional mutual capacitance touch sensing operation. Figure 7B is a cross-sectional view taken along line AA' of Figure 7A. As shown in FIG. 7A, when the emitter electrode 310-j has a positive touch sensing signal and the receiving electrodes 320-(i-1), 320-i, 320-(i+1) have no touch sensing signals, Wherein, part of the power line is emitted from the transmitting electrode 310-j to the receiving electrode 320-(i-1), 320-i, 320-(i+1), and part of the power line is emitted downward to the adjacent conductor with a negative relative potential below. (not shown). When the emitter electrode is a negative polarity touch sensing signal, the power line is distributed in the same manner as above, but in the opposite direction.

FIG. 8A is a schematic diagram showing the operation of the mutual inductance input device 300 of the suspension induction of the present invention. Figure 8B is a cross-sectional view taken along line BB' of Figure 8A. As shown in FIG. 8A, when the emitter electrode 310-j and the reflective deflecting electrode 370-j have the same amount of positive touch sensing signals, the receiving electrodes 320-(i-1), 320-i, 320-(i +1) When there is no touch sensing signal, the power line emitted from the transmitting electrode 310-j is repelled by the same potential of the reflective deflecting electrode and all upwards toward the receiving electrode 320-(i-1), 320-i, 320 -(i+1), therefore, its upward power line is multiplied and the extension is pushed up, so that the range of its induction can be increased. And because of its sensing The range becomes larger, so suspension sensing can be performed.

FIG. 9 is still another schematic diagram of a floating induction mutual capacitance input device 300 of the present invention. The main difference from FIG. 6 is that each of the reflective deflecting electrodes 370 is disposed adjacent to the corresponding transmitting electrode 310. Figure 10 is a cross-sectional view taken at CC' in Figure 9. As can be seen from FIG. 10, since the reflection deflecting electrode 370 is disposed around the corresponding emitter electrode 310, the reflective deflecting electrode 370 and the emitter electrode 310 are in the same plane.

Figure 11 is an equivalent circuit diagram of a receiving electrode RX of Figure 6. As shown in FIG. 11, since the present invention uses the at least one second amplifier 380-1 with a gain greater than zero to simultaneously output the touch sensing signal to the reflective deflecting electrode 370-1, the transmitting electrode 310-1 and the reflection The deflecting electrode 370-1 has the same potential (alternating current), so the capacitance C _TRS between the transmitting electrode 310-1 and the reflective deflecting electrode 370-1 is 0, so the capacitance of the receiving electrode RX is C _{RXeq → G} = C _Rg +C _FG . It can be seen from the formula that the proportion of C _FG is greatly increased, so the detection sensitivity is also greatly improved.

12 is a further schematic diagram of a floating induction mutual capacitance input device 1200 of the present invention. The main difference from FIG. 6 is that the at least one first amplifier 340 having a gain greater than zero is removed and the structure of the first selection switch circuit 350 is modified accordingly. That is, the floating-sensing mutual-capacitance input device 1200 includes a plurality of transmitting electrodes 310, a plurality of receiving electrodes 320, a touch sensing signal source 330, a selection switching circuit 1250, a plurality of reflective deflection electrodes 370, and a plurality of gains greater than Zero amplifier 380. The gain of the amplifiers 380 is preferably one. Suspension sensing mutual capacitance input device For the technical details of the 1200, refer to the foregoing description and FIG. 3 to FIG. 11 , and details are not described herein again.

FIG. 13 is another schematic diagram of a floating induction mutual capacitance input device 1300 of the present invention. The main difference from FIG. 12 is that each of the reflective deflecting electrodes 370 is disposed around the same plane of the corresponding transmitting electrode 310.

As can be seen from the foregoing description, the present invention uses the reflective deflection electrode 370 such that the power lines on the emitter electrode 310 are concentrated in the detection direction and extend in this direction, so that the sensing range becomes large, and suspension sensing can be performed. Thereby, the projected capacitive touch panel technology can be applied to the suspension sensing.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of the claims is intended to be limited to the above embodiments.

300‧‧‧suspension induction mutual capacitance input device

330‧‧‧Touch sensing signal source

340‧‧‧First amplifier

350‧‧‧First selection switch circuit

360‧‧‧Second selection switch circuit

310, 310-1, 310-2, ..., 310-m‧‧‧ transmitting electrodes

320, 320-1, 320-2, ..., 320-n‧‧‧ receiving electrodes

Claims (16)

A mutual sensing input device for suspension sensing, comprising: a plurality of transmitting electrodes; a plurality of receiving electrodes; a touch sensing signal source, which generates a touch sensing signal of at least one frequency; and at least one first amplifier having a gain greater than zero; a first selection switch circuit connected to the plurality of emitter electrodes, the touch sensing signal source, and the at least one first amplifier having a gain greater than zero, the first selection switch circuit sequentially aligning the touch sensing signals Selecting at least one of the plurality of emitter electrodes coupled to the plurality of emitter electrodes and coupling a plurality of selected emitter electrodes other than the selected at least one emitter electrode to a capacitor cancellation signal; a second selection switch circuit coupled to the a plurality of receiving electrodes and the at least one first amplifier having a gain greater than zero, the second selecting switch circuit sequentially coupling the sensing signals on the at least one receiving electrode of the plurality of receiving electrodes to the first one of the at least one gain greater than zero An amplifier to generate the capacitor cancellation signal and couple the capacitance cancellation signal to the first selection switch circuit And a plurality of reflective deflection electrodes, each of the plurality of reflective deflection electrodes respectively corresponding to one of the plurality of emitter electrodes; wherein each of the reflective deflection electrodes is disposed adjacent to the emitter electrode . The mutual inductance input device of the suspension sensing method of claim 1, further comprising: a plurality of second amplifiers having a gain greater than zero, the plurality of second amplifiers of the second amplifier having a gain greater than zero Corresponding to one transmitting power a pole for transmitting an electrical signal on the corresponding transmitting electrode to the reflective deflecting electrode corresponding to the transmitting electrode via the second amplifier. The mutual induction input device of the suspension sensing method of claim 2, wherein the gain of the at least one first amplifier having a gain greater than zero and the second amplifier of the plurality of second amplifiers having a gain greater than zero The system is programmable. The mutual induction input device for suspension sensing according to claim 1, wherein the plurality of transmitting electrodes, the plurality of receiving electrodes, and the plurality of reflective deflecting electrodes are made of a conductive material. The mutual induction input device for suspension sensing according to claim 4, wherein the conductive material is one of the following: chromium, bismuth, aluminum, silver, copper, titanium, nickel, lanthanum, cobalt, tungsten, Magnesium (Mg), calcium (Ca), potassium (K), lithium (Li), indium (In), molybdenum, alloy, indium tin oxide (ITO), IZO, ZnO, GZO, MG (OH) 2, conductive Polymer, carbon nanotube, graphene, nanosilver, lithium fluoride (LiF), magnesium fluoride (MgF2), and lithium oxide (Li2O). The mutual inductance input device of the suspension sensing method of claim 1, wherein the plurality of transmitting electrodes are arranged in a first direction, and the plurality of receiving electrodes are arranged in a second direction, the first The direction is perpendicular to the second direction. The mutual induction input device of the suspension sensing method of claim 1, wherein each of the plurality of transmitting electrodes and the plurality of receiving electrodes has a shape of one of the following: a rectangle, a triangle, a polygon, Wedge, diamond, square, circular or a combination of the above shapes. A mutual induction input device for suspension sensing, comprising: a plurality of transmitting electrodes; a plurality of receiving electrodes; a touch sensing signal source that generates at least one frequency of the touch sensing signal; a selection switch circuit connected to the plurality of transmitting electrodes and the touch sensing signal source, the selection switch circuit to the touch sensing signal </ RTI> selectively selecting at least one of the plurality of emitter electrodes; a plurality of reflective deflecting electrodes, each of the plurality of reflective deflecting electrodes corresponding to one of the plurality of emitter electrodes; And a plurality of amplifiers having a gain greater than zero, each of the amplifiers having a gain greater than zero corresponding to one of the emitter electrodes, respectively, for transmitting an electrical signal on the corresponding emitter electrode to the emitter electrode via the plurality of amplifiers Corresponding to the reflective deflection electrode, wherein the gain of each of the plurality of amplifiers having a gain greater than zero is programmable. The mutual induction input device of the suspension sensing method of claim 8, wherein each of the reflective deflection electrodes is disposed on a side of the corresponding one of the transmitting electrodes, and the area of the reflective deflecting electrode is not less than the emitting electrode area. The mutual induction input device for suspension sensing according to claim 8, wherein the plurality of transmitting electrodes, the plurality of receiving electrodes, and the plurality of reflective deflecting electrodes are made of a conductive material. The mutual induction input device for suspension sensing according to claim 10, wherein the conductive material is one of the following: chromium, bismuth, aluminum, silver, copper, titanium, nickel, lanthanum, cobalt, tungsten, Magnesium (Mg), calcium (Ca), potassium (K), lithium (Li), indium (In), molybdenum, alloy, indium tin oxide (ITO), IZO, ZnO, GZO, MG (OH) 2, conductive Polymer, carbon nanotube, graphene, nanosilver, lithium fluoride (LiF), magnesium fluoride (MgF2), and lithium oxide (Li2O). The mutual induction input device of the suspension sensing method of claim 8, wherein the plurality of transmitting electrodes are arranged in a first direction, the complex The plurality of receiving electrodes are arranged in a second direction, the first direction being perpendicular to the second direction. The mutual induction input device for suspension sensing according to claim 8, wherein each of the reflective deflection electrodes is disposed adjacent to the corresponding emitter electrode. A mutual sensing input device for suspension sensing, comprising: a plurality of transmitting electrodes; a plurality of receiving electrodes; a touch sensing signal source, which generates a touch sensing signal of at least one frequency; and at least one first amplifier having a gain greater than zero; a first selection switch circuit connected to the plurality of emitter electrodes, the touch sensing signal source, and the at least one first amplifier having a gain greater than zero, the first selection switch circuit sequentially aligning the touch sensing signals Selecting at least one of the plurality of emitter electrodes coupled to the plurality of emitter electrodes and coupling a plurality of selected emitter electrodes other than the selected at least one emitter electrode to a capacitor cancellation signal; a second selection switch circuit coupled to the a plurality of receiving electrodes and the at least one first amplifier having a gain greater than zero, the second selecting switch circuit sequentially coupling the sensing signals on the at least one receiving electrode of the plurality of receiving electrodes to the first one of the at least one gain greater than zero An amplifier to generate the capacitor cancellation signal and couple the capacitance cancellation signal to the first selection switch circuit a plurality of reflective deflection electrodes, each of the plurality of reflective deflection electrodes respectively corresponding to one of the plurality of emitter electrodes; and a plurality of second amplifiers having a gain greater than zero, the plurality of gains being greater than zero Each of the second amplifiers of the second amplifier corresponds to one of the transmitting powers a pole for transmitting an electrical signal on the corresponding transmitting electrode to the reflective deflecting electrode corresponding to the transmitting electrode via the second amplifier. The mutual induction input device of the suspension sensing method of claim 14, wherein each of the reflective deflection electrodes is disposed on a side of the corresponding one of the transmitting electrodes, and the area of the reflective deflecting electrode is not less than the emitting electrode area. A mutual sensing input device for suspension sensing, comprising: a plurality of transmitting electrodes; a plurality of receiving electrodes; a touch sensing signal source generating at least one frequency touch sensing signal; and a selection switching circuit connected to the plurality a plurality of transmitting electrodes and the touch sensing signal source, wherein the selection switch circuit sequentially transmits the touch sensing signals to at least one of the plurality of transmitting electrodes; the plurality of reflective deflecting electrodes, the plurality of reflections Each of the reflective deflection electrodes of the deflection electrode respectively corresponds to one of the plurality of emitter electrodes; and a plurality of amplifiers having a gain greater than zero, each amplifier of the plurality of amplifiers having a gain greater than zero corresponding to one of the emitter electrodes Transmitting, by the plurality of amplifiers, the electrical signal on the corresponding transmitting electrode to the reflective deflecting electrode corresponding to the transmitting electrode; wherein, the shape of each of the plurality of transmitting electrodes and the plurality of receiving electrodes is as follows One of them: rectangle, triangle, polygon, wedge, diamond, square Or said series of circular shape.