CN102890588A - Induction circuit capable of realizing multi-touch location - Google Patents
Induction circuit capable of realizing multi-touch location Download PDFInfo
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- CN102890588A CN102890588A CN2011102045145A CN201110204514A CN102890588A CN 102890588 A CN102890588 A CN 102890588A CN 2011102045145 A CN2011102045145 A CN 2011102045145A CN 201110204514 A CN201110204514 A CN 201110204514A CN 102890588 A CN102890588 A CN 102890588A
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Abstract
The invention relates to an induction circuit capable of realizing multi-touch location. The induction circuit comprises multiple interconnected RC (Resistor, Capacitor) basic units and multiple leading-out terminals; in the multiple interconnected RC basic units, each RC basic unit is composed of multiple interconnected resistors R and multiple capacitors C, each connection point between the interconnected resistors R is connected with one end of the capacitor C, and the other end of the capacitor C is connected with the ground G; in the multiple leading-out terminals, each leading-out terminal is connected with one RC basic unit, and is used for receiving an external excitation signal and providing the excitation signal to the connected RC basic unit, and simultaneously feeding back the output signal of the RC basic unit to the outside. According to the induction circuit provided by the invention, the induction circuit is composed of multiple interconnected RC basic units, can identify multiple touches pressed simultaneously, and can provide accurate capacitance values so as to locate the touches accurately.
Description
Technical field
The present invention relates to the touch-control field of locating technology, be specifically related to a kind of sensor circuit of realizing the multiconductor location.
Background technology
The various features such as the touch-control location technology is directly perceived owing to it, easy operating, reaction velocity are fast are used by the extensive carrier as man-machine interaction in electronic application field, its basic functional principle is: convert thereof into electronic signal when touching when touch control induction equipment has detected, process the position of determining touch by signal analysis, signal, then carry out corresponding action.Present touch-control location technology mainly adopts simple resistive touch induction structure or capacitance touch induction structure to realize.
Simple resistive touch induction structure generally is comprised of upper conductive layer, separation layer and lower conductiving layer, and wherein lower conductiving layer has electric current to pass through, so separation layer is used for when the user does not press conductive layer and lower conductiving layer in the isolation.When the user uses the touch panel of resistive touch induction structure, can touch conductive layer and cause two conductive layers to connect at contact point, this moment, the part electric current of lower conductiving layer injected upper conductive layer by tie point, cause the variation of electric current, estimated the position of tie point on this touch panel with this variation by electric current.When only having a contact point between two conductive layers, the position of contact point on touch panel can be determined by the output signal of lead-out terminal so; If but when simultaneously two or more contact point being arranged between two conductive layers, when namely having at least two contact points, but can only produce a corresponding output signal of estimating contact position, in this case, namely two finger tips contact with touch panel and produce a mean place touch point, can't correctly identify user's indication as the touch-screen of user interface.For fear of the generation of this type of situation, the user must avoid two finger tips to contact with touch panel at synchronization very carefully, and this constraint also causes the application of multifinger complicated man-machine interactive operation to can not get supporting.
The capacitance touch induction structure is divided into again self-capacitance touch sensible and two kinds of structures of mutual capacitance touch sensible.Wherein self-capacitance is also referred to as absolute capacitance or stray capacitance, most of self-capacitance touch induction devices play a role by the variation of the capacity of detection self-capacitance, the self-capacitance touch induction device has the induction electrode that conductive materials is made usually, comes the electric capacity of exploring electrode by sending internally electric charge in a small amount; When human body touch body during near touch induction device, the electric capacity of human body touch body and the coupling capacitance of sensing electrode can change the self-capacitance of sensing electrode, and the comparison of the self-capacitance by sensing electrode and original self-capacitance can be determined the position of touch point thus; The quantity of its induction chip of this kind self-capacitance touch induction device is directly proportional with the quantity of contact point, in touch panel applications, because the cost that this self-capacitance formula is directly responded to is higher, and can only identify at most two contacts, so usually be not used.
Mutual capacitance is also referred to as conduction electric capacity, the mutual capacitance touch induction device moves based on the coupling capacitance between their electrodes of induction or the variation of mutual capacitance, the electrode of mutual capacitance touch induction device is comprised of driver circuit and induction line, these circuits are in two mutually perpendicular separation layers, and are mingled with megohmite insulant between this is two-layer; During normal running, activate drive wire, between adjacent electrode, set up capacitive coupling, when sense object touches when projecting the field line of another electrode from an electrode, can detect the variation of mutual capacitance and the position of definite contact point; But higher, the complex process of manufacturing cost of the mutual capacitance type touch induction device that existing method realizes, and coupling capacitance out of true cause the contact point positioning error large easily.
Summary of the invention
Technical matters to be solved by this invention provides a kind of sensor circuit of realizing the multiconductor location, can realize at least two contacts are identified, and can provide more accurate capacitance so that the contact is located more accurately.
The present invention discloses a kind of sensor circuit of realizing the multiconductor location in order to solve the problems of the technologies described above, and comprises a plurality of interconnective RC elementary cells and a plurality of exit:
In described a plurality of interconnective RC elementary cell, each RC elementary cell is made of a plurality of interconnective resistance R and a plurality of capacitor C, each tie point place between described interconnective resistance R is connected with an end of capacitor C respectively, and the other end of described capacitor C is connected with ground G;
In described a plurality of exit, each exit is connected with a RC elementary cell, is used for receiving the external drive signal and offering the RC elementary cell that is connected, and feeds back simultaneously the output signal of this RC elementary cell to outside.
Further, the circuit structure of described RC elementary cell is shaped as polygon.
Further, described polygon is the RC elementary cell of delta circuit structure, the RC elementary cell of described delta circuit structure is made of 3 resistance R and 3 capacitor C, described 3 resistance R interconnect 3 limits of the RC elementary cell that forms described delta circuit structure, tie point place between per two limits all is connected with respectively a capacitor C, and described each capacitor C is connected with ground G.
Further, described polygon is the RC elementary cell of quadrilateral circuit structure, the RC elementary cell of described quadrilateral circuit structure is made of 4 resistance R and 4 capacitor C, described 4 resistance R interconnect 4 limits of the RC elementary cell that forms described quadrilateral circuit structure, tie point place between per two limits all is connected with respectively a capacitor C, and described each capacitor C is connected with ground G.
Further, described polygon is the RC elementary cell of hexagon circuit structure, the RC elementary cell of described hexagon circuit structure is made of 6 resistance R and 6 capacitor C, described 6 resistance R interconnect 6 limits of the RC elementary cell that forms described hexagon circuit structure, tie point place between per two limits all is connected with respectively a capacitor C, and described each capacitor C is connected with ground G.
Further, described polygon is the RC elementary cell of octagon circuit structure, the RC elementary cell of described octagon circuit structure is made of 8 resistance R and 8 capacitor C, described 8 resistance R interconnect 8 limits of the RC elementary cell that forms described octagon circuit structure, tie point place between per two limits all is connected with respectively a capacitor C, and described each capacitor C is connected with ground G.
Further, described polygon is the RC elementary cell of regular polygon circuit structure.
Further, described polygon is the RC elementary cell of irregular polygon circuit structure.
Further, described composition can realize that the shape of circuit structure of a plurality of interconnective RC elementary cell of sensor circuit of multiconductor location is identical.
Further, described composition can realize that the shape of circuit structure of a plurality of interconnective RC elementary cell of the sensor circuit of multiconductor location is at least two kinds.
Adopt the beneficial effect of the invention described above technical scheme to be: by the sensor circuit of being set up by a plurality of interconnective RC elementary cells, can realize a plurality of contacts of pressing are simultaneously identified, and can provide more accurate capacitance so that the contact is located more accurately.
Description of drawings
Fig. 1 is the sensor circuit structural representation that is comprised of a plurality of RC elementary cells in the embodiment of the invention;
Fig. 2 is the electrical block diagram of one of them RC elementary cell of Fig. 1 sensor circuit structural representation;
Fig. 3 is the sensor circuit structural representation that is comprised of the RC elementary cell of a plurality of quadrilateral circuit structures in the embodiment of the invention;
Fig. 4 is the sensor circuit structural representation that is comprised of the RC elementary cell of a plurality of hexagon circuit structures in the embodiment of the invention;
Fig. 5 is the sensor circuit structural representation that is comprised of the RC elementary cell of the RC elementary cell of a plurality of delta circuit structures and a plurality of quadrilateral circuit structures in the embodiment of the invention;
Fig. 6 is the RC circuit diagram in the sensor circuit in the embodiment of the invention;
Fig. 7 is the lag characteristic figure when the RC circuit has or not finger touch in the sensor circuit in the embodiment of the invention;
Fig. 8 is the fundamental diagram that sensor circuit is realized the location, contact in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention and feature are described, institute gives an actual example and only is used for explaining the present invention, is not be used to limiting scope of the present invention.
One embodiment of the invention discloses a kind of sensor circuit of realizing the multiconductor location, Fig. 1 is the sensor circuit structural representation that is comprised of a plurality of RC elementary cells in the embodiment of the invention, Fig. 2 is the electrical block diagram of one of them RC elementary cell of Fig. 1 sensor circuit structural representation, and as shown in Figure 1 and Figure 2: wherein said sensor circuit refers to be interconnected and the sensor circuit of the RC network structure that forms by resistance R and capacitor C; In the present embodiment, the described sensor circuit of multiconductor location of realizing comprises a plurality of interconnective RC elementary cells and a plurality of exit, wherein said each RC elementary cell is made of a plurality of interconnective resistance R and a plurality of capacitor C, each tie point place between described a plurality of interconnective resistance R is connected with respectively a capacitor C, and the other end of described capacitor C is connected with ground G; Each exit in described a plurality of exit is connected with a RC elementary cell in described a plurality of interconnective RC elementary cells, and described exit is used for the RC elementary cell that is connected is provided pumping signal and feeds back the output signal of this RC elementary cell.As described in Figure 1, the exit in the described sensor circuit comprises left end and the right-hand member exit of X-direction top and bottom exit and Y direction, and X-direction top exit is XT_0 in the present embodiment, XT_1, and XT_2 ..., XT_N; X-direction bottom exit is XB_0, XB_1, and XB_2 ..., XB_N; Y direction left end exit is YL_0, YL_1, and YL_2 ..., YL_N; Y direction right-hand member exit is YR_0, YR_1, and YR_2 ..., YR_N; Wherein four exits 102 of an elementary cell 101 in the sensor circuit of Fig. 1 are respectively: XT_0, XT_1, YL_N-1, YL_N.
In embodiments of the present invention, can be according to the needs of practical application, the described circuit structure design of a plurality of interconnective RC elementary cell of the sensor circuit that multiconductor is located that realizes is become various shapes, such as triangle, quadrilateral, hexagon, octagon etc., or regular polygon or irregular polygon etc.As shown in Figure 1, described sensor circuit is comprised of the RC elementary cell of a plurality of interconnective delta circuit structures, and wherein the RC elementary cell of each delta circuit structure is a conductive area with a plurality of exits; Fig. 2 is the electrical block diagram of one of them RC elementary cell of Fig. 1 sensor circuit structural representation, as shown in Figure 2, the RC elementary cell of described this delta circuit structure is comprised of 3 resistance R and 3 capacitor C, described 3 resistance R interconnect 3 limits of the RC elementary cell that forms the delta circuit structure, tie point place between per two limits all connects respectively a capacitor C, and described each capacitor C is connected with ground G.
Sensor circuit shown in Figure 3 is comprised of the RC elementary cell of a plurality of interconnective quadrilateral circuit structures, and wherein the RC elementary cell of each quadrilateral circuit structure is a conductive area with a plurality of exits; Wherein the RC elementary cell of each quadrilateral circuit structure is made of 4 resistance R and 4 capacitor C, described 4 resistance R interconnect 4 limits of the RC elementary cell that forms described quadrilateral circuit structure, tie point place between per two limits all connects respectively a capacitor C, and described each capacitor C is connected with ground G.
Sensor circuit shown in Figure 4 is comprised of the RC elementary cell of a plurality of interconnective hexagon circuit structures, and wherein the RC elementary cell of each hexagon circuit structure is a conductive area with a plurality of exits; Wherein the RC elementary cell of each hexagon circuit structure is made of 6 resistance R and 6 capacitor C, described 6 resistance R interconnect 6 limits of the RC elementary cell that forms described hexagon circuit structure, tie point place between per two limits all connects respectively a capacitor C, and described each capacitor C is connected with ground G.
The rest may be inferred, the shape of the circuit structure of described RC elementary cell is octagon also, the RC elementary cell of described octagon circuit structure is made of 8 resistance R and 8 capacitor C, described 8 resistance R interconnect 8 limits of the RC elementary cell that forms described octagon circuit structure, tie point place between per two limits all connects respectively a capacitor C, and described each capacitor C is connected with ground G.Can certainly be according to practical situations, the circuit structure design of described a plurality of interconnective RC elementary cells is become different shapes, as shown in Figure 5, described sensor circuit is comprised of the RC elementary cell of a plurality of interconnective delta circuit structures and the RC elementary cell of a plurality of interconnective quadrilateral circuit structures, and wherein the RC elementary cell of the RC elementary cell of each delta circuit structure and each quadrilateral circuit structure is a conductive area with a plurality of exits.In other embodiment of the present invention, have at least in described a plurality of interconnective RC elementary cells a RC elementary cell circuit structure be shaped as polygon, wherein said polygon can be regular polygon, also can be irregular polygon; When concrete the application, described polygon can be triangle, quadrilateral, hexagon, octagon or other the shape in the above-mentioned example.
Those skilled in the art should be understood that; design shape for the circuit structure of RC elementary cell can be flexible and changeable; be not limited to the described shape of above-mentioned example, any modification of making within the spirit and principles in the present invention, replacement, improvement etc. all should be included within protection scope of the present invention.
The principle of work that can realize the sensor circuit of multiconductor location below in conjunction with 6～8 couples of the present invention of accompanying drawing is described in detail:
In embodiments of the present invention, utilize " lag characteristic of RC circuit " to come the principle of work of location, contact is described, wherein, the lag characteristic of described RC circuit is as shown in Figure 6: in the RC of Fig. 6 circuit, add pulse signal at input end VIN, because electric capacity is discharged and recharged, exit VOUT can produce retardation Tc to input end VIN, as shown in Figure 7, wherein retardation Tc is the function of R and C: Tc=f (R, C).
Fig. 8 is the fundamental diagram that sensor circuit is realized the location, contact in the embodiment of the invention, as shown in Figure 8, the sensor circuit that forms take quadrilateral RC elementary cell is as example, on sensor circuit 801, add pumping signal with mode by exit all around in a certain order, utilize the lag characteristic of RC circuit, can produce corresponding row and postpone and be listed as to postpone.As shown in Figure 7: in a specific embodiment, the high level voltage of supposing pulse is VH, and the threshold value that detects voltage is VTH, VTH=a*VH then, and wherein a is constant (0＜a≤1); Time point when the voltage of input pulse VIN surpasses VTH is made as T0, and the time point the when voltage of corresponding exit VOUT surpasses VTH is made as T1, thus time delay Tc=T1-T0.Again because human body is equivalent to a device that stores electronics, similarly be equivalent to an electric capacity, when user's finger touch during to sensor circuit 801, because body capacitance is added on the sensor circuit, cause " normally " capacitance field of sensor circuit 801 to change, owing to changed the electric capacity of certain RC elementary cell on the sensor circuit 801 during finger touch, row, column retardation when therefore having or not finger touch is different, as shown in Figure 7: corresponding Tcf=T1f-T0f time delay when finger touch is arranged; And corresponding retardation Tcf also is the function of R and C: Tcf=f (R, C) when finger touch is arranged, and the retardation Tc with without finger touch the time compares, and obtains amount of delay △ T, △ T=Tcf-Tc.In embodiments of the present invention, described exit postpones and the row inhibit signal at the row that finger touch is arranged and produce during without finger touch for pumping signal, formed by △ TDC and register through preprocessing system 802(), calculate finger touch and row postpones and row postpone during without finger touch time difference, and convert thereof into digital signal, namely through △ TDC(Delta-Time-to Digital Converter time data converter) carry out the conversion of digital signal, and the digital signal after will changing is stored in the register, be processor finally by after-treatment system in the disposal system 803(present embodiment later), by specific algorithm, finish the positioning function to the contact.
Present embodiment is described respectively single-point in conjunction with the principle of work of above-mentioned sensor circuit, response process when 2 and multiple point touching: in embodiments of the present invention, when single finger touch is to the sensor circuit, because the inductance capacitance of finger has changed on the sensor circuit value of the capacitor C that is connected with ground G of certain any RC elementary cell, therefore capable delay output signal and the row delay output signal that should put changed thereupon, the signal that ranks postpone is through preprocessing system, the storage of after-treatment system and calculating, obtain the X of this point and the coordinate position of Y, thereby realized the location to single contact; When having two fingers to touch simultaneously on the sensor circuit, because the inductance capacitance of finger has changed the value of the capacitor C that is connected with ground G of certain RC elementary cell of 2 on the sensor circuit, capable delay output signal and row delay output signal that should 2 be changed thereupon, the signal that ranks postpone is through storage and the calculating of preprocessing system, after-treatment system, obtain the coordinate position of this X of 2 and Y, thereby realized the location to two contacts that touch simultaneously; When having simultaneously a plurality of finger touch to the sensor circuit, because the inductance capacitance of finger has changed the value of the capacitor C that is connected with ground G of the RC elementary cell of a plurality of points on the sensor circuit, therefore capable delay output signal and row delay output signal that should multiple spot be changed thereupon, the signal that ranks postpone is through storage and the calculating of preprocessing system, after-treatment system, obtain the X of these touch points and the coordinate position of Y, thereby realized the location to a plurality of contacts that touch simultaneously.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the sensor circuit that can realize the multiconductor location is characterized in that, the described sensor circuit of multiconductor location of realizing comprises a plurality of interconnective RC elementary cells and a plurality of exit:
In described a plurality of interconnective RC elementary cell, each RC elementary cell is made of a plurality of interconnective resistance R and a plurality of capacitor C, each tie point place between described interconnective resistance R is connected with an end of capacitor C respectively, and the other end of described capacitor C is connected with ground G;
In described a plurality of exit, each exit is connected with a RC elementary cell, is used for receiving the external drive signal and offering the RC elementary cell that is connected, and feeds back simultaneously the output signal of this RC elementary cell to outside.
2. the sensor circuit of realizing multiconductor location according to claim 1 is characterized in that, the circuit structure of described RC elementary cell be shaped as polygon.
3. the sensor circuit of realizing multiconductor location according to claim 2, it is characterized in that, described polygon is the RC elementary cell of delta circuit structure, the RC elementary cell of described delta circuit structure is made of 3 resistance R and 3 capacitor C, described 3 resistance R interconnect 3 limits of the RC elementary cell that forms described delta circuit structure, tie point place between per two limits all connects respectively a capacitor C, and described each capacitor C is connected with ground G.
4. the sensor circuit of realizing multiconductor location according to claim 2, it is characterized in that, described polygon is the RC elementary cell of quadrilateral circuit structure, the RC elementary cell of described quadrilateral circuit structure is made of 4 resistance R and 4 capacitor C, described 4 resistance R interconnect 4 limits of the RC elementary cell that forms described quadrilateral circuit structure, tie point place between per two limits all connects respectively a capacitor C, and described each capacitor C is connected with ground G.
5. the sensor circuit of realizing multiconductor location according to claim 2, it is characterized in that, described polygon is the RC elementary cell of hexagon circuit structure, the RC elementary cell of described hexagon circuit structure is made of 6 resistance R and 6 capacitor C, described 6 resistance R interconnect 6 limits of the RC elementary cell that forms described hexagon circuit structure, tie point place between per two limits all connects respectively a capacitor C, and described each capacitor C is connected with ground G.
6. the sensor circuit of realizing multiconductor location according to claim 2, it is characterized in that, described polygon is the RC elementary cell of octagon circuit structure, the RC elementary cell of described octagon circuit structure is made of 8 resistance R and 8 capacitor C, described 8 resistance R interconnect 8 limits of the RC elementary cell that forms described octagon circuit structure, tie point place between per two limits all connects respectively a capacitor C, and described each capacitor C is connected with ground G.
7. the sensor circuit of realizing the multiconductor location according to claim 2 is characterized in that described polygon is the RC elementary cell of regular polygon circuit structure.
8. the sensor circuit of realizing the multiconductor location according to claim 2 is characterized in that described polygon is the RC elementary cell of irregular polygon circuit structure.
9. each described sensor circuit of realizing multiconductor location is characterized in that according to claim 1～8, and described composition can realize that the shape of circuit structure of a plurality of interconnective RC elementary cell of sensor circuit of multiconductor location is identical.
10. each described sensor circuit of realizing multiconductor location is characterized in that according to claim 1～8, and described composition can realize that the shape of circuit structure of a plurality of interconnective RC elementary cell of the sensor circuit of multiconductor location is at least two kinds.
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| CN201110204514.5A CN102890588B (en) | 2011-07-21 | 2011-07-21 | Induction circuit capable of realizing multi-touch location |
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| CN201110204514.5A CN102890588B (en) | 2011-07-21 | 2011-07-21 | Induction circuit capable of realizing multi-touch location |
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| US20030016849A1 (en) * | 2001-04-27 | 2003-01-23 | Andrade Thomas L. | Capacitive sensor system with improved capacitance measuring sensitivity |
| US20040104826A1 (en) * | 2002-10-31 | 2004-06-03 | Harald Philipp | Charge transfer capacitive position sensor |
| CN101393502A (en) * | 2008-10-31 | 2009-03-25 | 敦泰科技有限公司 | Mutual capacitance touch screen and combined mutual capacitance touch screen |
| CN101853116A (en) * | 2009-04-03 | 2010-10-06 | Tcl集团股份有限公司 | Touch screen and contact positioning method thereof |
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2011
- 2011-07-21 CN CN201110204514.5A patent/CN102890588B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030016849A1 (en) * | 2001-04-27 | 2003-01-23 | Andrade Thomas L. | Capacitive sensor system with improved capacitance measuring sensitivity |
| US20040104826A1 (en) * | 2002-10-31 | 2004-06-03 | Harald Philipp | Charge transfer capacitive position sensor |
| CN101393502A (en) * | 2008-10-31 | 2009-03-25 | 敦泰科技有限公司 | Mutual capacitance touch screen and combined mutual capacitance touch screen |
| CN101853116A (en) * | 2009-04-03 | 2010-10-06 | Tcl集团股份有限公司 | Touch screen and contact positioning method thereof |
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