CN102486706A - Capacitor type touch device - Google Patents
Capacitor type touch device Download PDFInfo
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- CN102486706A CN102486706A CN2010105725381A CN201010572538A CN102486706A CN 102486706 A CN102486706 A CN 102486706A CN 2010105725381 A CN2010105725381 A CN 2010105725381A CN 201010572538 A CN201010572538 A CN 201010572538A CN 102486706 A CN102486706 A CN 102486706A
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Abstract
The invention provides a capacitor type touch device. The capacitor type touch device comprises a first touch unit, a first voltage difference capturing unit, a first feedback signal generation unit and a control unit, wherein the first touch unit comprises a touch base plate and a first conductive layer; the first voltage difference capturing unit is electrically connected with the first conductive layer and outputs a first voltage signal and a second voltage signal; the first feedback signal generation unit outputs a first feedback signal according to the variation value of the voltage difference between the first voltage signal and the second voltage signal; and the control unit receives the first feedback signal to calculate a touch position and outputs a first power supply signal to the first voltage difference capturing unit. Therefore, the capacitor type touch device disclosed by the invention has the advantages that the sensing speed is improved according to the simple circuit design, and production cost is reduced.
Description
Technical field
The present invention relates to a kind of contactor control device, particularly relate to a kind of capacitive touch device.
Background technology
The advantage that has ease of Use because of contact panel; The instead conventional keys; Incorporate gradually now in the electronic product purposes of all kinds; Especially on mobile communication, consumption electronic products application, the contact panel of combining display panel and input media becomes must being equipped with of high-order fashion electronic product especially.
Please with reference to shown in Figure 1, it is the synoptic diagram of existing capacitive touch device.Capacitive touch device 1 is to carry out sensing with charging conversion (Charge Transfer) mode.Capacitive touch device 1 has 11,12, two capacitor C of two switchs (Reset Switch)
p, C
SumAnd a comparer 13, wherein capacitor C
pElectric capacity for induction electrode.Capacitor C
pVia switch 11 and power signal V
DDElectrically connect capacitor C
SumParallelly connected with switch 12, and capacitor C
SumThe input end that is connected comparer 13 with an end of switch 12, and capacitive touch device 1 provides a reference voltage V in addition
ThTo another input end, output one voltage V after comparer 13 is compared the voltage of two input ends
Out
Because capacitor C
pVia switch 11 and power signal V
DDElectrically connect power signal V
DDTo capacitor C
pCharge, then change switch 11, so that capacitor C
pThe discharge and to capacitor C
SumCharge capacitor C
pElectric charge can move to capacitor C
Sum, during along with capacitive touch device 1 running, above-mentioned to C
pThe step that discharges and recharges can be carried out repeatedly.When finger touches in contact panel, capacitor C
pVoltage can rise, conversion is during switch 11, capacitor C
SumVoltage can rise, the amplitude that rises is then by capacitor C
pAnd capacitor C
SumVolume ratio decision, just know capacitor C as long as measure the time that surpasses certain voltage this moment
pVariable quantity, after measure finishing, control switch 12 again so that capacitor C
SumOriginal state is got back in discharge.Step according to above-mentioned can record the touch-control state.
Yet because capacitive touch device 1 needs through the discharging and recharging of two capacitors, to record the state of touch-control, it consumes time more of a specified duration easily, makes that the reaction time of capacitive touch device 1 is slower.In addition, existing capacitive touch device mostly adopts single-ended line of induction testing circuit, can't record the absolute coordinates of position of touch.Therefore, how the speed of a kind of easy circuit design with the raising sensing is provided, and can detects the capacitive touch device of the absolute coordinates of position of touch, real one of the current important topic that belongs to.
Summary of the invention
Because above-mentioned problem, the object of the invention improves the speed of sensing for a kind of capacitive touch device is provided with easy circuit design.
For achieving the above object, the present invention provides a kind of capacitive touch device, and it comprises one first touch control unit, one first voltage difference acquisition unit, one first a back coupling signal generation unit and a control module.First touch control unit has a touch base plate and one first conductive layer, and the touch base plate and the first conductive layer opposing parallel are provided with; One end of the first voltage difference acquisition unit and first conductive layer electrically connects, and exports one first voltage signal and one second voltage signal; The first back coupling signal generation unit and the first voltage difference acquisition unit electrically connect, and export one first back coupling signal according to the voltage difference changing value of first voltage signal and second voltage signal; The control module and the first voltage difference acquisition unit and the first back coupling signal generation unit electrically connect, and control module receives first and feedbacks signal with the calculating position of touch, and exports power signal to the first a voltage difference acquisition unit.
In one embodiment of the invention, first conductive layer has a plurality of induction buss.
In one embodiment of the invention; The first voltage difference acquisition unit has a pressure drop element, one first capturing element and one second capturing element; First capturing element connects an end of pressure drop element; And export first voltage signal, and second capturing element connects the other end of pressure drop element, and export second voltage signal.
In one embodiment of the invention, the first back coupling signal generation unit has an arithmetic element, and receives first voltage signal and second voltage signal.
In one embodiment of the invention, capacitive touch device also comprises one first selected cell, and itself and first touch control unit and the first voltage difference acquisition unit electrically connect.
In one embodiment of the invention, first selected cell has at least one multiplexer.
In one embodiment of the invention, first selected cell has at least one resistance and at least one on-off element.
In one embodiment of the invention, capacitive touch device also comprises one second touch control unit, and it has a touch base plate and one first conductive layer, and second touch control unit and first touch control unit electrically connect.
As stated; Because of foundation capacitive touch device of the present invention; It is being connected of multiplexer by first selected cell a plurality of induction buss of switching the first voltage difference acquisition unit and first touch control unit; And with first capturing element of the first voltage difference acquisition unit and the voltage at second capturing element acquisition pressure drop element two ends, to differentiate position of touch and time.In addition, capacitive touch device of the present invention also can comprise second touch control unit, and itself and first touch control unit electrically connect, and need not increase complicated circuit connection and detect position of touch.Capacitive touch device of the present invention can improve the speed of sensing by easy circuit design, and reduce production costs.
Description of drawings
Fig. 1 is the synoptic diagram of existing capacitive touch device;
Fig. 2 is the synoptic diagram of capacitive touch device of the present invention;
Fig. 3 is the oscillogram of capacitive touch device of the present invention;
Fig. 4～Fig. 6 is the variation aspect synoptic diagram of first selected cell of the present invention;
Fig. 7～Figure 10 E is the variation aspect synoptic diagram of first touch control unit of the present invention; And
Figure 11～Figure 15 is the variation aspect synoptic diagram of capacitive touch device of the present invention.
The reference numeral explanation
1,2,2a～2g: capacitive touch device
11,12: switch
13: comparer
21,21a～21g: first touch control unit
211,211a, 291: the first conductive layers
212,212b, 292: the second conductive layers
22,22a: the first voltage difference acquisition unit
221,261: the pressure drop element
222,262: the first capturing elements
223,263: the second capturing elements
23: the first back coupling signal generation units
231,271: arithmetic element
232,272: wave filter
233,273: comparer
234,274: subtracter
235,275: amplifying circuit
24: control module
241: microprocessor
242: the waveform modulated device
25,25a, 25b, 25c: first selected cell
251,281: multiplexer
252,282: resistance
253,283: on-off element
26: the second voltage difference acquisition units
27: the second back coupling signal generation units
28: the second selected cells
29: the second touch control units
30: the three touch control units
6: induction electrode
A～E: end points
C
p, C
Sum: capacitor
M: slide bar
N, O, P: button
V1, V11: first voltage signal
V2, V12: second voltage signal
V3, V13: voltage difference signal
V4, V5, V6, V8, V14, V15, V16: voltage signal
V7: the first back coupling signal
V17: the second back coupling signal
V9, VDD: power signal
V21, V22: signal
V
Th: reference voltage
V
Out: voltage
Embodiment
Below will a kind of capacitive touch device according to preferred embodiment of the present invention be described with reference to relevant drawings.
Please with reference to shown in Figure 2, it is the synoptic diagram of capacitive touch device of the present invention.Capacitive touch device 2 comprises one first touch control unit 21, one first voltage difference acquisition unit 22, one first and feedbacks signal generation unit 23, a control module 24 and first selected cell 25.
First touch control unit 21 has a touch base plate (figure does not show) and one first conductive layer 211.Touch base plate can be the substrate of Touch Screen, and its material is glass or plastic cement.First conductive layer 211 is as solid line indicated among the figure; It has a plurality of induction buss; Each is responded to bus and is formed by a plurality of induction electrodes 6 serial connection, and induction electrodes 6 of these induction buss are rhombus, square, circular, oval, polygon or irregular shape, in present embodiment; Induction electrode is to be example with the rhombus, but non-in order to limit the present invention.
First touch control unit 21 also has one second conductive layer 212; It also has a plurality of induction buss; And bearing of trends of these induction buss of these induction buss and first conductive layers 211 of second conductive layer 212 are vertical each other, and an end of second conductive layer 212 and 22 electric connections of the first voltage difference acquisition unit.In addition, the induction electrode of these induction buss of second conductive layer 212 is rhombus, square, circular, oval, polygon or irregular shape, and in present embodiment, induction electrode also is example with the rhombus.
In addition, first touch control unit 21 also has an insulation course (figure does not show), and it is arranged between first conductive layer 211 and second conductive layer 212, electrically conducts to avoid first conductive layer 211 and second conductive layer 212.
One end of the first voltage difference acquisition unit 22 and first conductive layer 211 electrically connects, and it has a pressure drop element 221, one first capturing element 222 and one second capturing element 223.Pressure drop element 221 is a capacitor or a resistance, and in the present embodiment, pressure drop element 221 is to be example with resistance, and is right non-in order to limit the present invention.First capturing element 222 connects an end of pressure drop element 221; And export one first voltage signal V1 according to the end points that connects; And this second capturing element 223 connects the other end of this pressure drop element 221, also exports one second voltage signal V2 according to the end points that connects.In present embodiment, first capturing element 222 and this second capturing element 223 are to be example with a voltage follower respectively.
The first back coupling signal generation unit 23 and the first voltage difference acquisition unit 22 electrically connect.The first back coupling signal generation unit 23 has an arithmetic element 231; To receive the first voltage signal V1 and the second voltage signal V2; And export a voltage difference signal V3 according to the voltage difference of the first voltage signal V1 and the second voltage signal V2; In the present embodiment, arithmetic element 231 is to be example with a differential amplifier.In addition, first feedbacks signal generation unit 23 and also has a wave filter 232, a comparer 233, a subtracter 234 and an amplifying circuit 235.Wave filter 232 receives voltage difference signal V3, and exports a voltage signal V4 to subtracter 234.The output terminal of wave filter 232 and comparer 233 electrically connect a reference voltage V
ThInput to comparer 233, and comparer 233 outputs one signal V21 is to control module 24.Subtracter 234 cuts a voltage signal V5 to export a voltage signal V6 with voltage signal V4, and wherein voltage signal V5 is provided or provided by a microprocessor 241 of control module 24 by external circuit.At last, voltage signal V6 is via producing into one first back coupling signal V7 after the amplifying circuit 235.In the present embodiment, wave filter 232 is to be example with a BPF..In addition, amplifying circuit 235 can freely be set up or delete because of the circuit design difference, and it is to be example to have amplifying circuit 235 that first of the capacitive touch device 2 of present embodiment is feedback signal generation unit 23.
The control module 24 and the first voltage difference acquisition unit 22 and first feedback the signal generation unit 23 electric connections.Control module 24 has a microprocessor 241 and a waveform modulated device 242.Microprocessor 241 receives the first back coupling signal V7, and converts the first back coupling signal V7 into digital signal by analog signal, exports a voltage signal V8, and this voltage signal V8 is a square-wave voltage signal.Waveform modulated device 242 receives voltage signal V8 and converts the power signal V9 of a string wave voltage signal to; At last power signal V9 is transferred to the first voltage difference acquisition unit 22 and first selected cell 25, make its action so that the first voltage acquisition unit 22 and first selected cell, 25 power supplys to be provided.
First selected cell 25 and first touch control unit 21 and the first voltage difference acquisition unit 22 electrically connect.First selected cell 25 has at least one multiplexer, at least one resistance and at least one on-off element.As shown in Figure 2; First selected cell 25 of the capacitive touch device 2 of present embodiment has a multiplexer 251 and a plurality of resistance 252; One end of multiplexer 251 and an end of these resistance 252 and first touch control unit 21 electrically connect, and the other end of multiplexer 251 and the first voltage difference acquisition unit 22 electrically connect.In addition, the resistance value of these resistance 252 of first selected cell 25 of present embodiment is greater than the resistance value of this pressure drop element 221.
The capacitive touch device 2 of present embodiment also comprises one second voltage difference acquisition unit 26, one second and feedbacks signal generation unit 27 and one second selected cell 28.
The second voltage difference acquisition unit 26 and first conductive layer 211 electrically connect away from an end of the first voltage difference acquisition unit 22, and the second voltage difference acquisition unit 26 also has a pressure drop element 261, one first capturing element 262 and one second capturing element 263.Pressure drop element 261 is electric capacity or a resistance, and in the present embodiment, pressure drop element 261 is to be example with resistance, and is right non-in order to limit the present invention.First capturing element 262 connects an end of pressure drop element 261; And export one first voltage signal V11 according to the end points that connects; And this second capturing element 263 connects the other end of this pressure drop element 261, also exports one second voltage signal V2 according to the end points that connects.In present embodiment, first capturing element 262 and this second capturing element 263 are example with a voltage follower respectively.
The second back coupling signal generation unit 27 and the second voltage difference acquisition unit 26 electrically connect.The second back coupling signal generation unit 27 has an arithmetic element 271; To receive the first voltage signal V11 and the second voltage signal V12; And export a voltage difference signal V13 according to the voltage difference of the first voltage signal V11 and the second voltage signal V12; In the present embodiment, arithmetic element 271 is to be example with a differential amplifier.In addition, second feedbacks signal generation unit 27 and also has a wave filter 272, a comparer 273, a subtracter 274 and an amplifying circuit 275.Wave filter 272 receives voltage difference signal V13, and exports a voltage signal V14 to subtracter 274.The output terminal of wave filter 272 and comparer 273 electrically connect a reference voltage V
ThInput to comparer 273, and comparer 273 outputs one signal V22 is to control module 24.Subtracter 274 cuts a voltage signal V15 to export a voltage signal V16 with voltage signal V14, and wherein voltage signal V15 is that external circuit provides or provides for a microprocessor 241 of control module 24.At last, voltage signal V16 is via producing into one second back coupling signal V17 after the amplifying circuit 275.In the present embodiment, wave filter 272 is to be example with a BPF..In addition, amplifying circuit 275 can freely be set up or delete because of the circuit design difference, and it is to be example to have amplifying circuit 275 that second of the capacitive touch device 2 of present embodiment is feedback signal generation unit 27.
Second selected cell 28 and first touch control unit 21 and the second voltage difference acquisition unit 26 electrically connect.Second selected cell 28 has at least one multiplexer, at least one resistance and at least one on-off element.As shown in Figure 2; Second selected cell 28 of the capacitive touch device 2 of present embodiment has a multiplexer 281 and a plurality of resistance 282; One end of multiplexer 281 and an end of these resistance 282 and first touch control unit 21 electrically connect, and the other end of multiplexer 281 and the second voltage difference acquisition unit 26 electrically connect.In addition, the resistance value of these resistance 282 of second selected cell 28 of present embodiment is greater than the resistance value of this pressure drop element 261.
Wherein, an end of the second voltage difference acquisition unit 26 and second conductive layer, 212 parts electrically connects, and an end of second conductive layer, 212 parts and the first voltage difference acquisition unit 22 electrically connect.
More than be to discuss to the structure of disclosed capacitive touch device 2; Then; Then still based on above-mentioned Fig. 2 and simultaneously with reference to Fig. 3, the example that is applied as so that capacitive touch device 2 uses in reality proposes detailed explanation to explain the action of this capacitive touch device 2.Wherein, Fig. 3 is an oscillogram of capacitive touch device 2.
At this, be the example explanation to detect first conductive layer 211.After first voltage signal V1 that arithmetic element 231 will be imported and the mutual computing of the second voltage signal V2, output voltage difference signal V3 then, via generation voltage signal V4 after wave filter 232 filtering, and transfers to comparer 233 and subtracter 234.Getting into comparer 233 voltage signal V4 waveform before is string wave voltage signal, with the reference voltage V of comparer 233
ThRelatively, export a signal V21 to microprocessor 241, this signal V21 is square wave news signals.Voltage signal V4 deducts voltage signal V5 through subtracter 234 and obtains voltage signal V6, after amplifying through amplifying circuit 235, obtains the first back coupling signal V7.Microprocessor 241 utilizes the rising edge (also can be falling edge, if the time that falling edge is then counted changes time T 3 into) of signal V21 to make flip-flop number to begin counting, count down to begin after the time T 1 to read first feedback signal V7 magnitude of voltage; And do ac/dc conversion via microprocessor 241; The magnitude of voltage of reading this moment is the peak value of the first back coupling signal V7, and when hand touched the line of induction, the peak value of the first back coupling signal V7 can change; Generally can become big; As shown in Figure 3, the first back coupling signal V7 of dotted line is touching, and the first back coupling signal V7 of solid line is for after touching.This moment microprocessor 241 just can to record present hand be to touch which bar line of induction, suppose not touch when responding to bus, the peak value of being read is Vax, to respond to the peak value that bus reads be Vap and hand touches.
After first voltage signal V11 that arithmetic element 271 will be imported and the mutual computing of the second voltage signal V12, output voltage difference signal V13 then, via generation voltage signal V14 after wave filter 272 filtering, and transfers to comparer 273 and subtracter 274.Comparer 273 is with reference voltage V
ThAfter doing comparison with voltage signal V14, and produce a signal V22, this signal V22 is the square-wave voltage signal.Voltage signal V14 obtains voltage signal V16 after deducting voltage signal V15 through subtracter 274, amplifies through amplifying circuit 275 to obtain the second back coupling signal V17 again.Microprocessor 241 utilizes the rising edge (also can be falling edge, if the time that falling edge is then counted changes time T 4 into) of signal V22 to make flip-flop number to begin counting, count down to begin after the time T 2 to read second feedback signal V17 magnitude of voltage; And do ac/dc conversion via microprocessor 241; The magnitude of voltage of reading this moment is the peak value of the second back coupling signal V17, and when hand touched the induction bus, the peak value of the second back coupling signal V17 can change; Generally can become big; As shown in Figure 3, the second back coupling signal V17 of dotted line is touching, and the second back coupling signal V17 of solid line is for after touching.When supposing not touch, the peak value of reading is Vbx, and hand to touch the peak value read of induction bus be Vbp.
If omit comparer 273 and signal V22; And the rising edge flip-flop number that directly utilizes signal V21 begins counting; Then can after counting down to time T 5, begin to read the magnitude of voltage of the second back coupling signal V17; And do ac/dc conversion via microprocessor 241, or the falling edge flip-flop number of signal V21 capable of using begins counting, count down to begin after the time T 6 to read second feedback signal V17 magnitude of voltage do the ac/dc conversion.
After obtaining the voltage change Vai, Vbi of 211 same induction buss of first conductive layer two-end-point, Vai=Vap-Vax, Vbi=Vbp-Vbx.Switch after each bar induction bus of same direction (about direction) through multiplexer 251,281 again; These voltage changes Vai, Vbi be multiplied by respectively respond to bus coordinate Xi; Calculate coordinate center of gravity X; Promptly be the coordinate X that touches of finger, the X that calculates like formula (1), formula (2) and formula (3).First conductive layer 211 of first touch control unit 21 has the 1st to N bar induction bus, i be 1～N one of them.
If only wish to get coordinate Y according to first conductive layer, 211 measured data, its formula capable of using (4) is calculated, and so just can learn the coordinate Y that finger touches.
Y=(Vai-Vbi)/(Vai+Vbi) formula (4)
According to above-mentioned step; After measuring the voltage change Vci, Vdi of 212 same induction buss of second conductive layer two-end-point; Process multiplexer 251,281 switches after each bar induction bus of same directions (direction up and down) again, these voltage changes Vci, Vdi is multiplied by respectively responds to bus coordinate Yi, calculates coordinate center of gravity Y; Promptly be the coordinate Y that touches of finger, the Y that calculates like formula (5), formula (6) and formula (7).Second conductive layer 212 of first touch control unit 21 has the 1st to N bar induction bus, i be 1～N one of them.
If only wish to get coordinate X according to second conductive layer, 212 measured data, its formula capable of using (8) is calculated, and so just can learn the coordinate X that finger touches.
X=(Vci-Vdi)/(Vci+Vdi) formula (8)
Please with reference to Fig. 4 to Fig. 6, below will be primarily aimed in the capacitive touch device variation aspect of first selected cell and second selected cell and explain.Because it is identical that first selected cell and the variation aspect of second selected cell are all, and all illustrates with first selected cell at this.In addition, for convenience's sake, the subelement among the figure (for example first touch control unit, the first voltage difference acquisition unit, the second voltage difference acquisition unit, the first back coupling signal generation unit and the second back coupling signal generation unit) is omitted and is not shown.
Please with reference to shown in Figure 4, what first selected cell 25 of the first selected cell 25a of present embodiment and the foregoing description was different is that the first selected cell 25a has two multiplexers 251 and a resistance 252.Wherein a multiplexer 251 electrically connects with pressure drop element 221, and the other end and first touch control unit 21 electrically connect; And an end of another multiplexer 251 and resistance 252 electrically connect, and the other end also electrically connects with first touch control unit 21.The switching of these multiplexers 251 of microprocessor 241 control of control module 24, since the state of every induction bus of flyback retrace first touch control unit 21.
Please with reference to shown in Figure 5, what first selected cell 25 of the first selected cell 25b of present embodiment and the foregoing description was different is, the first selected cell 25b has a multiplexer 251, a resistance 252 and a plurality of on-off element 253.These on-off elements 253 all electrically connect with the multiplexer 251 and first touch control unit 21, and the switching of multiplexer 251 these on-off elements 253 of control is to connect pressure drop element 221 or resistance 252.
Please with reference to shown in Figure 6, what first selected cell 25 of the first selected cell 25c of present embodiment and the foregoing description was different is, the first selected cell 25c has a multiplexer 251, a plurality of resistance 252 and a plurality of on-off element 253.These on-off elements 253 all electrically connect with the multiplexer 251 and first touch control unit 21, and the switching of multiplexer 251 these on-off elements 253 of control is to connect pressure drop element 221 or these resistance 252.
Please with reference to Fig. 7 to Figure 10 F, the variation aspect that below will be primarily aimed at first touch control unit in the capacitive touch device is explained.
Please with reference to shown in Figure 7; What first touch control unit 21 of the first touch control unit 21a of present embodiment and the foregoing description was different is; The first touch control unit 21a has the first conductive layer 211a, does not have second conductive layer, and the first conductive layer 211a has a plurality of induction buss; The induction electrode of these induction buss is a rhombus, and these induction buss electrically connect first selected cell 25 and second selected cell 28.
Please with reference to shown in Figure 8; What the first touch control unit 21b of present embodiment was different with the first touch control unit 21a of the foregoing description is; The first touch control unit 21a only has the second conductive layer 212b; Do not have first conductive layer, the induction electrode of these induction buss of the second conductive layer 212b is square, and these induction buss electrically connect first selected cell 25 and second selected cell 28.
Below; For convenience's sake, the subelement among the figure (the for example first voltage difference acquisition unit, the second voltage difference acquisition unit, the first back coupling signal generation unit, the second back coupling signal generation unit, first selected cell and second selected cell) is omitted and is not shown.
First touch control unit 21 of present embodiment also can connect a plurality of buttons, bar shaped slide bar or arc slide bar, and to replace these induction buss, please with reference to shown in Fig. 9 A～9I, it is the variation aspect of these buttons.Wherein terminal A and A ' need be connected in the connecting line at the two ends of same induction bus, and end points is different English when letter, and like terminal A, B, C, D and E, expression need respectively be connected to the connecting line of different induction buss, in order to avoid the phase mutual interference.
, be the variation aspect of first touch control unit please with reference to shown in Figure 10 A～10E.These induction buss of first touch control unit, 10 Λ～10C and at least one button or slide bar electrically connect.Shown in Figure 10 A, these induction buss of the first touch control unit 21c connect a plurality of slide bar M and a plurality of button N respectively.Shown in Figure 10 B, a plurality of button O connect these induction buss of the first touch control unit 21d respectively, and button P can be directly connected in second selected cell 28 or be connected in the induction bus of the first touch control unit 21d.Shown in Figure 10 C, the two induction buss wherein of the first touch control unit 21e connect the two ends of a slide bar M respectively.Please with reference to shown in Figure 10 D, the first touch control unit 21f is that having only end to end, two ends connect first selected cell or second selected cell with these induction bus series connection of first conductive layer.Shown in Figure 10 E, what the first touch control unit 21g was different with the first touch control unit 21f is, the first touch control unit 21g just connects at a distance from many induction buss, and flu spacer answers the quantity of bus can be according to design decision.
The variation aspect of above-described first touch control unit is merely and illustrates, and the variation aspect of first touch control unit can be different according to design, and make that the method or the button number of connection that connect are different.
Please with reference to Figure 11 to Figure 15; The variation aspect that below will be primarily aimed at capacitive touch device is explained; For convenience's sake, the subelement among the figure (for example first selected cell, second selected cell, the first voltage difference acquisition unit, the second voltage difference acquisition unit, the first back coupling signal generation unit and the second back coupling signal generation unit) is omitted and is not shown.
Please with reference to shown in Figure 11; What the capacitive touch device 2c of present embodiment and the capacitive touch device of the foregoing description 2 were different is, capacitive touch device 2c only has the first voltage difference acquisition unit 22, first and feedbacks signal generation unit 23, control module 24 and first selected cell 25.First selected cell 25 connects first conductive layer 211 of first touch control unit 21 and an end of second conductive layer 212.
Please with reference to shown in Figure 12, what the capacitive touch device 2d of present embodiment was different with the capacitive touch device 2c of the foregoing description is that capacitive touch device 2d also has one second touch control unit 29.Second touch control unit 29 and first touch control unit 21 electrically connect, and its connected mode can be serial or parallel connection.Second touch control unit 29 has a touch base plate (figure does not illustrate), one first conductive layer 291 and one second conductive layer 292.Wherein, in the capacitive touch device 2 of touch base plate, first conductive layer 291 and second conductive layer 292 and the foregoing description, touch base plate, first conductive layer 211 and second conductive layer 212 have identical technical characterictic, so repeat no more in this.
Please with reference to shown in Figure 13; What the capacitive touch device 2e of present embodiment was different with the capacitive touch device 2d of the foregoing description is, capacitive touch device 2d also has the second voltage difference acquisition unit 26, second and feedbacks the signal generation unit 27 and second selected cell 28.Second touch control unit 29 and first touch control unit 21 electrically connect, and its connected mode can be serial or parallel connection, and an end of first touch control unit 21 and first selected cell 25 electrically connect, and an end of second touch control unit 29 and second selected cell 28 electrically connect.
Please with reference to shown in Figure 14, what the capacitive touch device 2f of present embodiment was different with the capacitive touch device 2e of the foregoing description is that capacitive touch device 2f also has one the 3rd touch control unit 30.The 3rd touch control unit 30 and first touch control unit 21 and second touch control unit 29 electrically connect, and its connected mode can be serial or parallel connection.The 3rd touch control unit 30 has a touch base plate (figure does not illustrate), one first conductive layer and one second conductive layer.Wherein, in the capacitive touch device 2 of touch base plate, first conductive layer and second conductive layer and the foregoing description, touch base plate, first conductive layer 211 and second conductive layer 212 have identical technical characterictic, so repeat no more in this.Second touch control unit 29 and the 3rd touch control unit 30 all only have first conductive layer in the present embodiment, and the induction electrode of first conductive layer is a rectangle.The two ends side of first conductive layer 211 of first touch control unit 21 does not electrically connect with second touch control unit 29 and the 3rd touch control unit 30, and an end of second conductive layer 212 of second touch control unit 21 and first selected cell 25 and second selected cell 28 electrically connect.An end and first selected cell 25 that second touch control unit 29 does not connect first touch control unit 21 electrically connect, and the 3rd touch control unit 30 does not connect an end and 28 electric connections of second selected cell of first touch control unit 21.
Please with reference to shown in Figure 15, the capacitive touch device 2g of present embodiment is different with the capacitive touch device 2f of the foregoing description is that the 3rd touch control unit 30 and first touch control unit 21 and second touch control unit, 29 electric connection modes are inequality.The two ends side of first conductive layer 211 of first touch control unit 21 does not electrically connect with second touch control unit 29 and the 3rd touch control unit 30 in the present embodiment, and an end of second conductive layer 212 of second touch control unit 21 and first selected cell 25 and second selected cell 28 electrically connect.The end that first touch control unit 21 and second touch control unit 29 electrically connect also electrically connect with first selected cell 25, and an end of first touch control unit 21 and the 3rd touch control unit 30 also electrically connects with second selected cell 28.
In sum; Because of foundation a kind of capacitive touch device of the present invention; It is being connected of multiplexer by first selected cell a plurality of induction buss of switching the first voltage difference acquisition unit and first touch control unit; And with first capturing element of the first voltage difference acquisition unit and the voltage at second capturing element acquisition pressure drop element two ends, to differentiate position of touch and time.In addition, capacitive touch device of the present invention also can comprise second touch control unit, and itself and first touch control unit electrically connect, to increase the area of touch-control.Capacitive touch device of the present invention can improve the speed of sensing by easy circuit design, and can detect the absolute coordinates of position of touch, and reduce production costs.
The above is merely illustrative, but not is restricted.Anyly do not break away from spirit of the present invention and category, and to its equivalent modifications of carrying out or change, all should be contained in during claim of the present invention encloses.
Claims (15)
1. capacitive touch device comprises:
One first touch control unit has one first conductive layer;
One first voltage difference acquisition unit with the end electric connection of this first conductive layer, and is exported one first voltage signal and one second voltage signal;
One first back coupling signal generation unit electrically connects with this first voltage difference acquisition unit, and exports one first back coupling signal according to the voltage difference changing value of this first voltage signal and this second voltage signal; And
One control module electrically connects with this first voltage difference acquisition unit and this first back coupling signal generation unit, and this control module receives this first back coupling signal with the calculating position of touch, and exports a power signal to this first voltage difference acquisition unit.
2. capacitive touch device as claimed in claim 1, wherein this first conductive layer has a plurality of induction buss, and each induction electrode of responding to bus is rhombus, square, circular or irregular shape.
3. capacitive touch device as claimed in claim 2; Wherein this first touch control unit also has one second conductive layer; It has a plurality of induction buss; And the bearing of trend of this induction bus of this second conductive layer and this induction bus of this first conductive layer is vertical each other and do not electrically connect, and an end of this second conductive layer and this first voltage difference acquisition unit electrically connect.
4. capacitive touch device as claimed in claim 1; Wherein this first voltage difference acquisition unit has a pressure drop element, one first capturing element and one second capturing element; This first capturing element connects an end of this pressure drop element; And export this first voltage signal, and this second capturing element connects the other end of this pressure drop element, and export this second voltage signal.
5. capacitive touch device as claimed in claim 4, wherein this first capturing element and this second capturing element are respectively a voltage follower.
6. capacitive touch device as claimed in claim 4, wherein this first back coupling signal generation unit has an arithmetic element, and receives this first voltage signal and this second voltage signal, and this arithmetic element is a differential amplifier.
7. capacitive touch device as claimed in claim 1, wherein this power signal is a string wave voltage signal.
8. capacitive touch device as claimed in claim 7, wherein this control module has a microcontroller and a waveform modulated device, and this microcontroller is exported a square-wave voltage signal to this waveform modulated device, this this string wave voltage signal of waveform modulated device output.
9. capacitive touch device as claimed in claim 4 also comprises one first selected cell, electrically connects with this first touch control unit and this first voltage difference acquisition unit.
10. capacitive touch device as claimed in claim 9; Wherein this first selected cell has at least one multiplexer and a plurality of resistance; One end of this multiplexer and an end of this resistance and this first touch control unit electrically connect, and the other end of this multiplexer and this first voltage difference acquisition unit electrically connect.
11. capacitive touch device as claimed in claim 10, wherein the resistance value of this resistance of this first selected cell is greater than the resistance value of this pressure drop element.
12. capacitive touch device as claimed in claim 1 also comprises:
One second voltage difference acquisition unit; Electrically connect with an end of this first conductive layer; It has another pressure drop element, one the 3rd capturing element and one the 4th capturing element, and the 3rd capturing element connects an end of this pressure drop element, and exports a tertiary voltage signal; And the 4th capturing element connects the other end of this another pressure drop element, and exports one the 4th voltage signal; And
One second back coupling signal generation unit; It has an arithmetic element; And receiving this tertiary voltage signal and the 4th voltage signal, this second back coupling signal generation unit is exported one second according to the voltage difference of this tertiary voltage signal and the 4th voltage signal and is feedback signal to this control module.
13. capacitive touch device as claimed in claim 12 also comprises one second touch control unit, this second touch control unit and this first touch control unit electrically connect.
14. capacitive touch device as claimed in claim 13, wherein an end of this second touch control unit and this first voltage difference acquisition unit electrically connect, and an end of this second touch control unit and this second voltage difference acquisition unit electrically connect.
15. capacitive touch device as claimed in claim 14 also comprises one the 3rd touch control unit, electrically connects with this second touch control unit, an end of the 3rd touch control unit and this second voltage difference acquisition unit electrically connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105725381A CN102486706A (en) | 2010-12-01 | 2010-12-01 | Capacitor type touch device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105725381A CN102486706A (en) | 2010-12-01 | 2010-12-01 | Capacitor type touch device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102486706A true CN102486706A (en) | 2012-06-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105725381A Pending CN102486706A (en) | 2010-12-01 | 2010-12-01 | Capacitor type touch device |
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| Country | Link |
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| CN (1) | CN102486706A (en) |
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| TWI498800B (en) * | 2013-06-06 | 2015-09-01 | Focaltech Electronics Ltd | Electrode structures and lcd apparatus |
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Application publication date: 20120606 |