CN108700974A - Capacitive detection circuit and electronic device - Google Patents

Capacitive detection circuit and electronic device Download PDF

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Publication number
CN108700974A
CN108700974A CN201680002043.0A CN201680002043A CN108700974A CN 108700974 A CN108700974 A CN 108700974A CN 201680002043 A CN201680002043 A CN 201680002043A CN 108700974 A CN108700974 A CN 108700974A
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electrode
detection circuit
receiving electrode
capacitive detection
coupled
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CN201680002043.0A
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CN108700974B (en
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梁颖思
文亚南
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

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

Abstract

A kind of capacitive detection circuit (14) is applied to an electronic device (10), wherein the capacitive detection circuit (14) includes multiple carry electrode (TX1~TXN);An at least receiving electrode (RX1~RXM);And a driving sensing circuit (140), it is coupled to an at least receiving electrode (RX1~RXM), for generating a drive signal (VDR) to an at least receiving electrode (RX1~RXM), and an at least receiving electrode (RX described in measurement1~RXM) voltage, to generate an at least output signal (VO11~VOMN);Wherein, an at least output signal (VO11~VOMN) it is relevant to an at least receiving electrode (RX1~RXM) and the multiple carry electrode (TX1~TXN) a carry electrode between an at least mutual capacitance (CM11~CMMN) capacitance.

Description

Capacitive detection circuit and electronic device Technical field
This application involves a kind of capacitive detection circuit and electronic device more particularly to a kind of capacitive detection circuits and electronic device for promoting mutual tolerance sensing precision.
Background technique
As science and technology is showing improvement or progress day by day, the operation interface of various electronic products is gradually humanized in recent years.For example, through touch screen, user can directly be operated on the screen with finger or stylus, input information/text/pattern, eliminate the need for the trouble of the input equipments such as keyboard or key.In fact, touch screen usually by an induction panel and is set to the display at induction panel rear and forms.The position that electronic device is touched on induction panel according to user, and the picture that display is presented at that time to judge the meaning of the secondary touching, and execute corresponding operating result.
Mutual capacitance type capacitance sensing has been widely used in the electronic device with touch screen; and with scientific and technological evolution and the market demand; the touch screen (such as flexible screen) with ultra-thin protective layer has been developed in the prior art; however; for the touch screen with ultra-thin protective layer; coupled capacitor between its electrode and finger is larger, and the degree of difficulty for causing mutual tolerance to sense increases.
Therefore, the prior art has improved necessity in fact.
Summary of the invention
Therefore, the main purpose of the application is to be to provide the capacitive detection circuit and electronic device of a kind of enhancement mutual tolerance sensing precision.
In order to solve the above-mentioned technical problem, this application provides a capacitive detection circuits, are applied to an electronic device, which is characterized in that the capacitive detection circuit includes multiple carry electrodes；An at least receiving electrode；And a driving sensing circuit, it is coupled to an at least receiving electrode, for generating a driving signal to an at least receiving electrode, and the voltage of an at least receiving electrode is measured, to generate an at least output signal；Wherein, an at least output signal is relevant to the capacitance of at least mutual capacitance between an at least receiving electrode and a carry electrode of the multiple carry electrode.
In addition, the application separately provides an electronic device, it include a capacitive detection circuit, including multiple carry electrodes；An at least receiving electrode；And one driving sensing circuit, it is coupled to an at least receiving electrode, for generating a driving signal to an at least receiving electrode, and measure the voltage of an at least receiving electrode, to generate multiple output signals, wherein, the multiple output signal is relevant to the capacitance of multiple mutual capacitance between an at least receiving electrode and the multiple carry electrode；And a signal processing module, it is coupled to the driving sensing circuit, and according to the multiple output signal, judges at least touch position in the touch screen.
Detailed description of the invention
Fig. 1 is the schematic diagram of one electronic device of the embodiment of the present application.
Capacity effect schematic diagram of the Fig. 2 between the embodiment of the present application electrode and electrode and between electrode and finger.
Fig. 3 is the equivalent capacity schematic diagram between the driving sensing circuit of the embodiment of the present application one and a ground terminal.
Fig. 4 is the schematic diagram that the embodiment of the present application one drives sensing circuit.
Fig. 5 is the schematic diagram that the embodiment of the present application one drives sensing circuit.
Fig. 6 is the schematic diagram that the embodiment of the present application one drives sensing circuit.
Fig. 7 is the schematic diagram that the embodiment of the present application one judges process.
Fig. 8 is the schematic diagram of one capacitive detection circuit of the embodiment of the present application.
Fig. 9 is the top view of multiple carry electrodes and multiple receiving electrodes.
Figure 10 is the side view of multiple carry electrodes and multiple receiving electrodes along an A-A ' line.
Specific embodiment
In order to which the objects, technical solutions and advantages of the application are more clearly understood, with reference to the accompanying drawings and embodiments, the application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, it is not used to limit the application.
Referring to FIG. 1, Fig. 1 is the schematic diagram of one electronic device 10 of the embodiment of the present application.Electronic device 10 can be the electronic products such as a notebook, a smart phone or a computer comprising a capacitive detection circuit 14 and a signal processing module 16.Capacitive detection circuit 14 is connected to carry electrode TX1~TXN, receiving electrode RX1~RXM, capacitive detection circuit 14 includes a driving sensing circuit 140.Carry electrode TX1~TXNAnd receiving electrode RX1~RXMIt may be disposed at a touch screen of electronic device 10, touch screen can be a flexible screen or bendable (Flexible) screen.Driving sensing circuit 140 (can pass through a multiplexer MUX) is coupled to receiving electrode RX1~RXM, the driving generation of sensing circuit 140 one driving signal VDR to receiving electrode RX1~RXM, and receiving electrode RX is measured in different time1~RXMVoltage, to generate output signal VO11~VOMN‐, wherein output signal VO11~VOMN‐It is relevant to carry electrode TX1~TXNWith receiving electrode RX1~RXMBetween be formed by mutual capacitance (Mutual Capacitance) CM11~CMMNCapacitance, it can use output signal VO11~VOMNCharacterize measured CM11~CMMNCapacitance. Signal processing module 16 is coupled to capacitive detection circuit 14, and according to output signal VO11~VOMNThe position that judgement touching occurs.
On the other hand, as shown in Figure 1, carry electrode TX1~TXNPass through switch SW1~SWNIt is coupled to a ground terminal GND, when capacitive detection circuit 14 is intended to detect (interpretation) carry electrode TX1~TXNIn a carry electrode TXnWith receiving electrode RX1~RXMIn a receiving electrode RXmBetween a mutual capacitance CMmnWhen, correspond to carry electrode TXnA switch SWnFor breaking (Cut off), and rest switch SW1~SWn-1、SWn+1~SWNFor conducting (Conducted).In other words, when capacitive detection circuit 14 is intended to interpretation receiving electrode RX1~RXMIn any receiving electrode and carry electrode TXnBetween mutual capacitance when, carry electrode TXnSuspension joint (Floating) state of presentation, and remaining carry electrode TX1~TXn-1、TXn+1~TXNIt is coupled to ground terminal GND.For example, when capacitive detection circuit 14 is intended to interpretation receiving electrode RXmWith carry electrode TX1Between mutual capacitance when, switch SW1For open circuit, carry electrode TX1Presentation floating, and rest switch SW2~SWNFor conducting, at this time remaining carry electrode TX2~TXNIt is coupled to ground terminal GND.
Specifically, referring to FIG. 2, Fig. 2 is painted when capacitive detection circuit 14 is intended to interpretation receiving electrode RXmWith carry electrode TX1Between mutual capacitance when, the capacity effect between capacity effect and electrode and finger between electrode and electrode, wherein CTX1Represent carry electrode TX1Capacitor between finger, CRXmRepresent receiving electrode RXmCapacitor between finger, CMm1Represent receiving electrode RXmWith carry electrode TX1Between capacitor, CMm2~CMmNRepresent receiving electrode RXmWith carry electrode TX2~TXNBetween capacitor, and CFERepresent the capacitor between finger and ground terminal GND.Due to carry electrode TX1For floating, the electric current I that self-powered innervation slowdown monitoring circuit 140 flows out can be split into an electric current I1, an electric current I2An and electric current IB, wherein electric current I1It represents from receiving electrode RXmFlow through capacitor CTX1And capacitor CM1And the electric current of finger is flowed to, and electric current I2It represents from receiving electrode RXmFlow through capacitor CRXmThe electric current of finger is flowed to and flows to, electricity Flow IBIt represents from receiving electrode RXmFlow to remaining carry electrode TX2~TXNElectric current.
Further, the equivalent capacity between sensing circuit 140 and ground terminal GND is driven to be illustrated in Fig. 3, Fig. 3 is labeled with a node NF, a node NTX1, a node NRXmAn and capacitor CM2-N, wherein node NFRepresent the finger in Fig. 2, node NTX1Represent the carry electrode TX in Fig. 21, node NRXmRepresent the receiving electrode RX in Fig. 2m, capacitor CM2-NRepresent CMm2~CMmNIt is formed by an equivalent capacity.Subsequent explanation for convenience, receiving electrode RX/ node NRXmCapacitor between ground terminal GND equivalent can become a testing capacitance CUT, i.e. capacitor CFE、CTX1、CRXm、CMm1、CM2-NIt can be in receiving electrode RXm/ node NRXmBe formed as testing capacitance C between ground terminal GNDUT.Similarly, electric current I is in node NRXmIt is split into electric current I1, electric current I2And electric current IB, electric current I1From node NRXmFlow through capacitor CMm1And capacitor CTX1Flow to node NF, and electric current I2From node NRXmFlow through capacitor CRXmFlow to node NF, electric current IBFrom node NRXmFlow through capacitor CM2-NFlow to ground terminal GND.In addition, in the case where touch screen 12 is the situation of flexible screen, capacitor CTX1、CRXmMuch larger than capacitor CMm1(i.e. capacitor CFE、CTX1、CRXmAll it is much larger than capacitor CM), and capacitor CTX1With capacitor CRXmQuite, electronic device 10 can carry out operation using signal processing module 16, to eliminate electric current IBGenerated effect, and Fig. 2 and circuit structure shown in Fig. 3 are utilized, it may make electric current I1 that can more reflect capacitor CMm1Capacitance size, and keep capacitor interpretation more accurate, so that the judgement to position of touch is more accurate, and then promote overall efficiency.
In addition, particular circuit configurations about driving sensing circuit 140, fig. 4 to fig. 6 is please referred to, fig. 4 to fig. 6 is respectively the schematic diagram of the driving sensing circuit 440,540,640 of the multiple embodiments of the application, and driving sensing circuit 440,540,640 can be used to realize driving sensing circuit 140.For convenience of explanation, fig. 4 to fig. 6 is all to drive sensing circuit 140 to be intended to interpretation mutual capacitance CMm1For be illustrated, and testing capacitance C depicted in fig. 4 to fig. 6UTIt represents when capacitive detection circuit 14 is intended to interpretation receiving electrode RXmWith carry electrode TX1Between mutual capacitance when, (connect between capacitive detection circuit 14 and ground terminal GND Receive electrode RXm/ node NRXmBetween ground terminal GND) equivalent capacity.As shown in figure 4, driving sensing circuit 440 includes one drive circuit 442 and a measurement circuit 444.Driving circuit 442 is coupled to receiving electrode RXm/ node NRXm, for generating driving signal VDR, measurement circuit 444 is coupled to receiving electrode RXm/ node NRXm, for measuring receiving electrode RXmVoltage, and generate output signal VOm1.Driving circuit 442 may include that an AC signal generator AC4 and an impedance unit Z4, impedance unit Z4 are coupled between AC signal generator AC4 and impedance unit Z4, and AC signal generator AC4 can produce a driving signal VDR' to impedance unit Z4, and impedance unit Z4 can be by driving signal VDR' it is transferred to receiving electrode RXm, wherein impedance unit Z4 can be made of resistance or capacitor.In addition, measurement circuit 444 may include a filter, an amplifier or an analog-digital converter (Analog-to-Digital Converter, ADC).In an embodiment, capacitive detection circuit 14 may compare driving signal VDR' and receiving electrode RXmVoltage, and judge testing capacitance CUTCapacitance size.
As shown in figure 5, driving sensing circuit 540 includes that a charge transfer circuit 542 and a measurement circuit 544, charge transfer circuit 542 are coupled to receiving electrode RXm/ node NRXm, charge transfer circuit 542 may include transfer switch S1, S2 and an accumulation capacitor CI5, wherein accumulation capacitor CI5For with testing capacitance CUTCharge-exchange is carried out, and measurement circuit 544 is used to measure accumulation capacitor CI5An accumulation voltage, and generate output signal VOm1.One end of switch S1 is coupled to accumulation capacitor CI5A first end and receiving electrode RXm/ node NRXm, the other end of switch S1 is coupled to ground terminal GND；One end of switch S2 is coupled to accumulation capacitor CI5A second end, the other end of switch S2 is coupled to a voltage generator 5420, to receive a voltage V caused by voltage generator 5420H5.Measurement circuit 544 is coupled to accumulation capacitor CI5Second end.In a first time, transfer switch S1 is open circuit and transfer switch S2 is conducting, at this time 5420 couples of accumulation capacitor C of voltage generatorI5And testing capacitance CUTCharging, and accumulate capacitor CI5With testing capacitance CUTBetween will do it charge share (Charge Sharing)；In one second time, transfer switch S1 For conducting and transfer switch S2 is open circuit, at this point, measurement circuit 544 can measure accumulation capacitor CI5Accumulation voltage, and output signal output VO accordinglym1To signal processing module 16.In addition, measurement circuit 544 also may include a filter, an amplifier and/or an analog-digital converter, and drive driving signal V caused by sensing circuit 540DRIt can be considered a square-wave signal.
As shown in fig. 6, driving sensing circuit 640 includes that a charge transfer circuit 642 and a measurement circuit 644, charge transfer circuit 642 are coupled to receiving electrode RXm/ node NRXm, charge transfer circuit 642 may include transfer switch S3, S4 and an accumulation capacitor CI6, wherein accumulation capacitor CI6For with testing capacitance CUTCharge-exchange is carried out, and measurement circuit 644 is used to measure accumulation capacitor CI6An accumulation voltage, and generate output signal VOm1.One end of transfer switch S3 is coupled to accumulation capacitor CI6A first end, the other end of transfer switch S3 is coupled to ground terminal GND；One end of switch S4 is coupled to receiving electrode RXm/ node NRXm, the other end of switch S4 is coupled to a voltage generator 6420, to receive a voltage V caused by voltage generator 6420H6.In addition, accumulation capacitor CI6A second end be coupled to receiving electrode RXm/ node NRXm, and measurement circuit 644 is coupled to accumulation capacitor CI6Second end.In the third time, transfer switch S3 is open circuit and transfer switch S4 is conducting, and voltage generator 6420 is to testing capacitance C at this timeUTCharging；In tetra- time of Yu Yi, transfer switch S3 is conducting and transfer switch S4 is open circuit, accumulates capacitor C at this timeI6With testing capacitance CUTCharge-exchange is carried out, in this way, which measurement circuit 644 can measure accumulation capacitor CI6Accumulation voltage and output signal output VO accordinglym1To signal processing module 16.In addition, measurement circuit 644 also may include a filter, an amplifier or an analog-digital converter, and drive driving signal V caused by sensing circuit 640DRIt can be considered a square-wave signal.
In addition, signal processing module 16 can be according to output signal VOutIn correspond to mutual capacitance CM11~CMMN‐Output signal VO11~VOMN, judge the coordinate position that touch-control occurs.Specifically, signal processing module 16 receives output signal VO11~VOMNAfter can be by output signal VO11~VOMNIt is arranged in one Output signal matrix (as shown in table 1), wherein output signal VOmnIt is relevant to carry electrode TXnWith receiving electrode RXmBetween mutual capacitance CMmn。
For convenience of explanation, it is assumed that a touch point betides carry electrode TXjWith receiving electrode RXiBetween, and another touch point betides carry electrode TXgWith receiving electrode RXkBetween, and the actual value of output signal matrix is formed into a matrix M1 (as shown in table 2).In matrix M1, output signal VOig(it is relevant to carry electrode TXgWith receiving electrode RXiBetween mutual capacitance CMig) it is VSi+VSg+BL, output signal VOkj(it is relevant to carry electrode TXjWith receiving electrode RXkBetween mutual capacitance CMkj) it is VSk+VSj+BL, output signal VOij(it is relevant to carry electrode TXjWith receiving electrode RXiBetween mutual capacitance CMij) it is VSi '+VSj+BL, output signal VOkg(it is relevant to carry electrode TXgWith receiving electrode RXkBetween mutual capacitance CMkg) value be VSk '+VSg+BL, the i-th row (Row) of matrix M1 value of remaining row element (Row Entry) other than output signal VOig and output signal VOij is all VSi+BL, row k value of remaining row element other than output signal VOkj and output signal VOkg is all VSk+BL, and the jth column (Column) of matrix M1 are in addition to output signal VOijAnd output signal VOkjThe value of remaining column element (Column Entry) is all VSj+BL in addition, and g is arranged in addition to output signal VOigAnd output signal VOkgThe value of remaining column element is all VSg+BL in addition, and matrix M1 value of remaining element (Entry) other than above-mentioned element is all BL, wherein VSi, VSk, VSj, VSg can represent the particular value of output signal, and BL represents a baseline value (Baseline).It should be noted that, (the i of matrix M1, j) a position and (k, g) a position is the position that actual touch spots occur, and (the i of matrix M1, g) a position and a position (k, j) be easy to cause the erroneous judgement of position of touch and form terrible point.
Table 1
Table 2 (matrix M1)
It should be noted that, it is to be different from matrix M1 other rows to be formed by row vector that the i-th row and row k of matrix M1, which is formed by row vector, the jth of matrix M1 arranges and g column to be formed by column vector be to be different from matrix M1 other column to be formed by column vector, therefore, signal processing module 16 can the i-th row of selection matrix M1 and the particular row of kth behavioural matrix M1 and selected jth column and g be classified as square The special column of battle array M1.In addition, in order to avoid ghost point causes the erroneous judgement of position of touch, the output signal for being located at particular row (the i-th row) can be subtracted particular value VSi by signal processing module 16, the output signal for being located at particular row (row k) is subtracted into particular value VSk, the output signal for being located at special column (jth column) is subtracted into particular value VSj, and the output signal for being located at special column (g column) is subtracted into particular value VSg.In this way, which matrix M2 can be obtained in signal processing module 16.As shown in table 3, only (i in matrix M2, j) a element and (k, g) value of a element is VSi '-VSi+BL and VSk '-VSk+BL, the value of remaining element is all BL, in this case, because of (i, j) a element and (k, g) a element is all different from the other elements of matrix M2, therefore signal processing module 16 can select (i, j) a element and (k, g) a element is special elements, and according to the (i of matrix M2, j) a element and (k, g) position where a element, the position for judging that touch-control occurs is located at carry electrode TXj‐With receiving electrode RXi‐Between and carry electrode TXg‐With receiving electrode RXk‐Between.
Table 3 (matrix M2)
In addition, signal processing module 16 can calculate particular value VSi according to the i-th row of matrix M1, particular value VSk is calculated according to row k, according to the jth column count particular value VSj of matrix M1, and according to g column count particular value VSg.For example, signal processing module 16 can be according to output signal VOi1~VOi(j-1)、VOi(j+1)~VOi(g-1)、VOi(g+1)~VOiNParticular value VSi is calculated, according to output signal VOk1~VOk(j-1)、VOk(j+1)~VOk(g-1)、VOk(g+1)~VOkNParticular value VSk is calculated, according to output signal VO1j~VO(i-1)j、VO(i+1)j~VO(k-1)j、VO(k+1)j~VOMjParticular value VSj is calculated, and according to output signal VO1g~VO(i-1) g、VO(i+1)g~VO(k-1)g、VO(k+1)g~VOMgCalculate particular value VSg.
About signal processing module 16 according to output signal VO11~VOMNJudge that the mode of operation of position occurs for touch-control, can further be summarized as a judgement process.Referring to FIG. 7, Fig. 7 is the schematic diagram that the embodiment of the present application one judges process 70, judge that process 70 comprises the steps of:
Step 700: by output signal VO11~VOMNIt is arranged in matrix M1.
Step 702: the particular row of the i-th row and kth behavioural matrix M1 is chosen from matrix M1, and selection jth column and g are classified as the special column of matrix M1, it is to be different from matrix M1 other rows to be formed by row vector that wherein the i-th row and row k, which are formed by row vector, and it is to be different from matrix M1 other column to be formed by column vector that jth column and g column, which are formed by column vector,.
Step 704: the output signal VO of the i-th row will be located ati1~VOiNParticular value VSi is subtracted, the output signal VO of row k will be located atk1~VOkNParticular value VSk is subtracted, the output signal VO of jth column will be located at1j~VOMjSubtract particular value VSj, and the output signal VO that g column will be located at1g~VOMgParticular value VS2g is subtracted, to form matrix M2.
Step 706: choosing (i, j) a element from matrix M2 and (k, g) a element is special elements, wherein (i, j) a element and (k, g) a element are different from the other elements of matrix M2.
Step 708: according to (i, j) a element and (k, g) a element in the position of matrix M2, judging the position that touch-control occurs.
About the details of operation for judging process 70, aforementioned relevant paragraph is please referred to, is repeated no more in this.
It should be noted that, table 2 and table 3 are to assume that a touch point generates a particular row and a special example that is classified as is illustrated, actually, one touch point generates can multiple particular rows and multiple special column, and ability preforming technique personnel can change accordingly according to the concept of process 70 is judged, and multiple special elements are found out, and then judge that position occurs for touch-control.
In addition, judging that process 70 can be used in carry electrode TX1~TXNAnd receiving electrode RX1~RXMIn electronic device with asymmetric line style (Asymmetric Pattern, such as double-deck tin indium oxide (Double Indium Tin Oxide, DITO) line style), i.e. carry electrode TX1~TXNWith receiving electrode RX1~RXMWith different line widths.For example, Fig. 9 and Figure 10 is please referred to, Fig. 9 is respectively carry electrode TX1~TXNAnd receiving electrode RX1~RXMTop view, Figure 10 be carry electrode TX1~TXNAnd receiving electrode RX1~RXMAlong the side view of an A-A ' line.As shown in figure 9, carry electrode TX1~TXNIt is parallel to each other, receiving electrode RX1~RXMAlso it is parallel to each other, carry electrode TX1~TXNWith receiving electrode RX1~RXMInterlaced it can be arranged, for example, sending electrode TX1~TXNWith receiving electrode RX1~RXMIt can be mutually perpendicular to.In addition, carry electrode TX1~TXNWith a line width W1, carry electrode TX1~TXNSpacing have a spacing G1；Receiving electrode RX1~RXMWith a line width W2, receiving electrode RX1~RXMSpacing have a spacing G2.Wherein, carry electrode TX1~TXNLine width W1 be greater than receiving electrode RX1~RXMLine width W2, and carry electrode TX1~TXNBetween spacing G1 be less than receiving electrode RX1~RXMBetween spacing G2.In addition, as shown in Figure 10, carry electrode TX1~TXNAnd receiving electrode RX1~RXMIt is all set on a display screen 120 of electronic device 10, specifically, receiving electrode RX1~RXMIt may be disposed on display screen 120, and carry electrode TX1~TXNReceiving electrode can be alternately arranged on RX1~RXMOn, that is to say, that as carry electrode TX1~TXNIt is set to a horizontal level L1, receiving electrode RX1~RXMWhen being set to a horizontal level L2, receiving electrode RX1~RXMHorizontal level L2 be located at display screen 120 and carry electrode TX1~TXNHorizontal level L1 between.
As carry electrode TX1~TXNAnd receiving electrode RX1~RXMWhen asymmetric line style with (be applied to DITO) depicted in Fig. 9 and Figure 10, using judge that more signal to noise ratio (Signal-to-Noise Ratio, SNR) can be obtained in process 70.Specifically, it is assumed that touch point occurs in carry electrode TXjWith receiving electrode RXiBetween, when capacitive detection circuit 14 is intended to interpretation receiving electrode RXiWith carry electrode TX1~TXNIn a carry electrode TXa(wherein carry electrode TXaFor carry electrode TX1~TXNIn in addition to carry electrode TXjOther carry electrodes in addition, i.e. carry electrode TXaFor TX1~TXj-1、TXj+1~TXNIn one of them carry electrode) between mutual capacitance when, because of carry electrode TXjWith biggish line width W1 and lesser spacing G1 and carry electrode TXjPositioned at upper layer, and carry electrode TXjReceiving electrode RX will be shieldediAnd generate screen effect；And when capacitive detection circuit 14 is intended to interpretation receiving electrode RXiWith carry electrode TXjBetween mutual capacitance when, carry electrode TXjIt is floating without screen effect.In this way, which the value (or being equivalent to the value for reducing BL) of VSi '-VSi and VSk '-VSk in matrix M2 can be enhanced, and make the interpretation of touch point position more accurate.
It is noted that previous embodiment is used to illustrate the concept of the application, those skilled in the art is when the modification that can do difference accordingly.For example, the driving sensing circuit of the application is not limited to be coupled to multiple receiving electrodes through multiplexer, the driving sensing circuit of the application also can only be coupled to single receiving electrode, that is the electronic device of the application may include multiple driving sensing circuits, and each sensing circuit is only coupled to a receiving electrode of multiple receiving electrodes, signal processing module can judge the position that touch-control occurs according to the output signal that multiple sensing circuits are exported.
In addition, the switch SW of capacitive detection circuit1~SWNIt is not limited to be coupled to ground terminal GND.It lifts For example, referring to FIG. 8, Fig. 8 is the schematic diagram of one capacitive detection circuit 84 of the embodiment of the present application, for convenience of explanation, capacitive detection circuit 84 is only painted a receiving electrode RX.Capacitive detection circuit 84 is similar to capacitive detection circuit 14, therefore same components continue to use the same symbol.Similarly, when capacitive detection circuit 84 is intended to interpretation receiving electrode RX and carry electrode TXnBetween mutual capacitance when, correspond to carry electrode TXnSwitch SWnFor open circuit, and rest switch SW1~SWn-1、SWn+1~SWNFor conducting.Unlike capacitive detection circuit 14, switch SW1~SWNIt is coupled to receiving electrode RX.In other words, when capacitive detection circuit 84 is intended to interpretation receiving electrode RX and carry electrode TXnBetween mutual capacitance when, carry electrode TXnStill in floating, and remaining carry electrode TX1~TXn-1、TXn+1~TXNIt is coupled to receiving electrode RX.In this way, when capacitive detection circuit 84 is intended to interpretation receiving electrode RX and carry electrode TXnBetween mutual capacitance when, do not have electric current from receiving electrode RX and flow to remaining carry electrode TX1~TXn-1、TXn+1~TXN, signal processing module 16 judges therefore the baseline value BL when coordinate position that touch-control occurs can be reduced, and keeps the interpretation of position of touch more accurate.
In conclusion the application generates driving signal to receiving electrode using driving sensing circuit, and measure the voltage of receiving electrode；Using switch to control multiple carry electrodes, so that floating is presented in carry electrode to be surveyed；Utilize the erroneous judgement for judging that process avoids ghost point from causing position of touch.In this way, which the electronic device of the application can be sharp and accurately judges position of touch.
The foregoing is merely the section Examples of the application, are not intended to limit the invention, and any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all be included in the protection scope of the present invention.

Claims (26)

  1. A kind of capacitive detection circuit is applied to an electronic device, and the electronic device includes touch screen, and the touch screen includes multiple carry electrodes and an at least receiving electrode, wherein the capacitive detection circuit includes:
    One driving sensing circuit, is coupled to an at least receiving electrode, for generating a driving signal to an at least receiving electrode, and the voltage of an at least receiving electrode is measured, to generate an at least output signal；Wherein, an at least output signal is relevant to the capacitance of at least mutual capacitance between an at least receiving electrode and a carry electrode of the multiple carry electrode.
  2. Capacitive detection circuit described in claim 1, wherein, when detecting first mutual capacitance between one first carry electrode of the multiple carry electrode and one first receiving electrode of an at least receiving electrode when the capacitive detection circuit, first carry electrode is suspension joint.
  3. Capacitive detection circuit as claimed in claim 2, wherein remaining carry electrode in the multiple carry electrode other than first carry electrode is coupled to a ground terminal.
  4. Capacitive detection circuit as claimed in claim 2, wherein remaining carry electrode in the multiple carry electrode other than first carry electrode is coupled to first receiving electrode.
  5. Capacitive detection circuit as described in claim 1, wherein additionally comprise:
    One first end of multiple switch, each switch is coupled to a carry electrode of the multiple carry electrode；
    Wherein, when first mutual capacitance between one first carry electrode of the multiple carry electrode of capacitive detection circuit interpretation and one first receiving electrode of an at least receiving electrode, corresponding to a first switch of first carry electrode to be breaking in the multiple switch, rest switch is conducting.
  6. Capacitive detection circuit as claimed in claim 5 a, wherein second end of each switch is coupled to a ground terminal in the multiple switch.
  7. Capacitive detection circuit as claimed in claim 5 a, wherein second end of each switch is coupled to first receiving electrode in the multiple switch.
  8. Capacitive detection circuit as described in claim 1, wherein the driving sensing circuit includes:
    One drive circuit is coupled to an at least receiving electrode, for generating the driving signal；And
    One measurement circuit is coupled to an at least receiving electrode, for measuring the voltage of an at least receiving electrode.
  9. Capacitive detection circuit as claimed in claim 8, wherein the driving circuit includes:
    One AC signal generator；And
    One impedance unit is coupled between the AC signal generator and an at least receiving electrode.
  10. Capacitive detection circuit as described in claim 1, wherein the driving sensing circuit includes:
    One charge transfer circuit is coupled to an at least receiving electrode, including an accumulation capacitor, wherein the accumulation capacitor is used to carry out charge-exchange with a testing capacitance, wherein the testing capacitance is relevant to a mutual capacitance of the multiple mutual capacitance；And
    One measurement circuit, for measuring an accumulation voltage of the accumulation capacitor, to generate the output signal.
  11. Capacitive detection circuit as claimed in claim 10, wherein the charge transfer circuit includes:
    One first transfer switch, one end is coupled to the accumulation capacitor and an at least receiving electrode, the other end are coupled to a ground terminal；And
    One second transfer switch, one end are coupled to the accumulation capacitor and the measurement circuit, and the other end is coupled to a first voltage generator.
  12. Capacitive detection circuit as claimed in claim 11, wherein, in a first time, first transfer switch is breaking (Cutoff), second transfer switch is conducting (Conducted), and in one second time, first transfer switch is conducting, and second transfer switch is open circuit.
  13. Capacitive detection circuit as claimed in claim 12, wherein, in the first time, the first voltage generator is to the testing capacitance and the accumulation capacitor charging, and in second time, the measurement circuit measures the accumulation voltage of the accumulation capacitor.
  14. Capacitive detection circuit as claimed in claim 10, wherein the charge transfer circuit includes:
    One third transfer switch, one end are coupled to the accumulation capacitor, and the other end is coupled to a ground terminal；And
    One the 4th transfer switch, one end are coupled to an at least receiving electrode, and the other end receives a first voltage.
  15. Capacitive detection circuit as claimed in claim 14, wherein in the third time, the third transfer switch is open circuit, and the 4th transfer switch is conducting, and in one the 4th time, the third transfer switch is conducting, and the 4th transfer switch is open circuit.
  16. Capacitive detection circuit as claimed in claim 15, wherein in the Yu Suoshu third time, the first voltage generator charges to the testing capacitance, and in the 4th time, and the testing capacitance and the accumulation capacitor carry out charge-exchange.
  17. Capacitive detection circuit as described in claim 8 or 10, wherein the measurement circuit includes a filter, an amplifier or an analog-digital converter.
  18. A kind of electronic device, wherein include:
    One capacitive detection circuit comprising:
    Multiple carry electrodes；
    Multiple receiving electrodes；And
    One driving sensing circuit, it is coupled to the multiple receiving electrode, for generating a driving signal to the multiple receiving electrode, and measure the voltage of the multiple receiving electrode, to generate multiple output signals, wherein, the multiple output signal is relevant to the capacitance of multiple mutual capacitance between the multiple receiving electrode and the multiple carry electrode；And
    One signal processing module is coupled to the driving sensing circuit, and according to the multiple output signal, judges at least touch position in the touch screen.
  19. Capacitive detection circuit as claimed in claim 18, wherein the signal processing module is used to execute following steps, according to the multiple output signal, to judge at least touch position in the touch screen:
    The multiple output signal is arranged in one first matrix；
    An at least particular row and at least one special column are chosen from first matrix；
    Multiple first output signals for corresponding to one first particular row in an at least particular row are subtracted into one first particular value, multiple second output signals for corresponding to one first special column in at least one special column are subtracted into one second particular value, to form one second matrix；
    An at least special elements are chosen from second matrix, wherein an at least special elements are different from the other elements of second matrix；And
    According to an at least special elements in the position of second matrix, at least touch position in the touch screen is judged.
  20. Capacitive detection circuit as claimed in claim 19, wherein the signal processing module is separately used to execute following steps:
    According to first particular row of first matrix, first particular value is calculated；And
    According to the described first special column of first matrix, second particular value is calculated.
  21. Electronic device as claimed in claim 18, wherein the multiple carry electrode is parallel to each other, and the multiple receiving electrode is parallel to each other.
  22. Electronic device as claimed in claim 18, wherein the multiple carry electrode and the interlaced setting of the multiple receiving electrode.
  23. Electronic device as claimed in claim 18, wherein the multiple carry electrode and the multiple reception Electrode is mutually perpendicular to.
  24. Electronic device as claimed in claim 18, wherein the multiple carry electrode has one first line width, and multiple receiving electrodes have one second line width, and the First Line is wider than second line width.
  25. Electronic device as claimed in claim 18, wherein the multiple carry electrode has one first spacing, and multiple receiving electrodes have one second spacing, and first spacing is less than second spacing.
  26. Electronic device as claimed in claim 18, wherein additionally comprise:
    One display screen；
    Wherein, the multiple carry electrode is set to a first level level, and the multiple receiving electrode is set to one second horizontal level；
    Wherein, the second horizontal position level is between the display screen and first level level.
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