CN101957699B - Touch input device and touch sensing circuit - Google Patents
Touch input device and touch sensing circuit Download PDFInfo
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- CN101957699B CN101957699B CN 200910160004 CN200910160004A CN101957699B CN 101957699 B CN101957699 B CN 101957699B CN 200910160004 CN200910160004 CN 200910160004 CN 200910160004 A CN200910160004 A CN 200910160004A CN 101957699 B CN101957699 B CN 101957699B
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Abstract
The invention discloses a touch input device and a touch sensing circuit, wherein the touch input device comprises a touch panel, a selection module and a differential motion detection module, wherein the touch panel contains a plurality of capacitor nodes which are formed and distributed on the touch panel respectively. The selection module is electrically connected with the capacitor nodes of the touch panel, and a first capacitor node and a second capacitor node of the capacitor nodes are selected by the selection module, wherein the second capacitor node is close to the first capacitor node. The differential motion detection module is electrically connected with the selection module for detecting capacitance differences between the first capacitor node and the second capacitor node which are selected by the selection module and generating touch sensing signals according to the capacitance differences. The touch input device and the touch sensing circuit of the invention are capable of saving numbers and reducing setting cost of circuit elements, reducing circuit setting area, accelerating the detection process and the like.
Description
Technical field
The present invention relates to a kind of touch-control input device and touch control sensing circuit, and be particularly related to touch-control input device and the touch control sensing circuit that adopts the differential detection mode.
Background technology
Because science and technology is showing improvement or progress day by day, more and more diversification and the hommizations of product such as drive information, communication, electronics.For example, by products such as contact panel, handwriting pads, the user can directly with finger or pointer running program or input message on panel, save the trouble of input medias such as in the past using mouse or keyboard.
It is several that the technology of existing contact panel is broadly divided into resistance-type, condenser type, optical profile type and ultrasonic formula.Its chief component of electric resistance touch-control panel comprises up and down two-layer indium tin oxide-coated glass (ITO glass).When object touches that the upper strata electro-conductive glass makes its depression and when the lower floor electro-conductive glass contacts, the controller of this panel will detect a voltage signal, and judge accordingly the coordinate position of contact point.
Capacitance type touch-control panel is divided into again surface-capacitive touch panel and projective capacitive touch panel.The structure of surface-capacitive touch panel forms and comprises an electro-conductive glass, all be coated with conductive material on the electro-conductive glass two sides, and the outside of electro-conductive glass can be covered with again, and one deck is scratch resistant films.Electrode around glass plate can form uniform electric field at glass surface.Whenever the user with the finger touch panel, its finger will with outside conductive layer on capacitive coupling, suck electric current small on panel.The magnitude of current that flows out from the electrode that is positioned at contact panel each corner is directly proportional with the distance of pointing the corner, and the controller of contact panel is by the positional information that calculates contact point to this current ratio.
And recently, projective capacitive touch panel is widely used in various screen touch electronic devices (as intelligent mobile phone) especially.The positioning principle of projective capacitive touch panel is to utilize the capacitance variations that is embedded in the induction grid in contact panel to judge the position of contact point.See also Fig. 1, Fig. 1 shows the schematic diagram of contact panel 10 in prior art.As shown in Figure 1, contact panel 10 is embedded with many directions X wires with layered mode and (comprises X1～Xm) and many Y-direction wires and (comprise Y1～Yn).Directions X wire and Y-direction wire are staggered and jointly form the induction grid, namely form a capacitive node (for example capacitive node 100a, 100b, 100c in Fig. 1) in the point of crossing of each directions X wire and Y-direction wire, for example in this example, have m*n capacitive node.In the time of the finger touch screen, finger will change the capacitance of capacitive node contiguous on the induction grid to the coupled relation of induction grid.Testing circuit can utilize the capacitance change of the capacitive node on the induction grid to calculate the coordinate position of contact point.
See also Fig. 2, Fig. 2 shows the schematic diagram of touch-control input device 1 in prior art and touch control detection circuit 12 thereof.As shown in Figure 2, touch-control input device 1 of the prior art has comprised the touch control sensing circuit 12 that coordinates contact panel 10 to use.Touch control sensing circuit 12 inside can comprise multiplex's selector switch 120, control circuit 1200, differential detection module 122 and comparison capacitor array (array) 124.In side circuit, differential detection module 122 can be comparator circuit, and comparison capacitor array 124 can a plurality of capacitors of ad hoc fashion spread configuration and form.In comparison capacitor array 124, each capacitor difference correspondence is as the reference capacitance value of the capacitive node of contact panel 10 diverse locations.
This be because, the capacitive node of diverse location all has different built-in (intrinsic) capacitances on capacitance type touch-control panel, they may be because of the coupled relation of baseplate material, thickness, contiguous conductive region or different from contact panel frame distance, and need have different reference capacitance values.Adopt single criterion can cause serious distortion.For example the built-in capacitance that faces antermarginal capacitive node namely be positioned at the Centromedian capacitive node of contact panel notable difference arranged.
In practical application, control circuit 1200 can be controlled multiplex's selector switch 120, and ((Y1～Yn) is with selected specific capacitive node for X1～Xm) and Y-direction wire to select specific directions X wires by multiplex's selector switch 120.For example multiplex's selector switch 120 can select directions X wire X3 and Y-direction wire Y3 to correspond to capacitive node 100a.Then, the capacitance of the capacitive node 100a that differential detection module 122 can be chosen with this moment with compare capacitor array 124 and compare.In this example, comparison capacitor array 124 stores the built-in capacitance of different capacitive nodes when not contacting on contact panel 10 in order to provide, as the standard of follow-up judgement.That is to say, comparison capacitor array 124 need arrange many capacitors of deciding with different capacitances.For corresponding all capacitive nodes, it may be provided with at most m*n the capacitor with different capacitance sizes.
On the other hand, the capacitance of comparison capacitor array needs close to testing capacitance value on contact panel, capacitive node 100a in practical application for example, 100b, the capacitance of 100c may be 10pF, 11pF and 12pF, compares capacitor array and must be the capacitor array of 10pF～12pF.And want electric capacity more than built-in 10pF relatively to consume area and cost is higher IC is inner.
Yet, under the requirement that the contact panel degree of accuracy progressively improves now, capacitive node (m*n) number that the contact panel 10 of same size comprises improves constantly, huge comparison capacitor array 124 (m*n capacitor altogether) is set on touch-control input device 1, and having seemed does not meet cost benefit, and also the target with electronic installation slimming now runs in the opposite direction.And in present large-sized contact panel, it is larger that the stray capacitance of a whole piece capacitive node adds federation, and the capacitance of the comparison capacitor array that it is required is also larger.
The present invention proposes a kind of touch-control input device and touch control sensing circuit, can be widely used in the electronic system of various touch-control inputs, to address the above problem.
Summary of the invention
One object of the present invention is to provide a kind of touch-control input device, and it comprises contact panel, selects module and differential detection module.
According to an embodiment, contact panel comprises a plurality of capacitive nodes, and these capacitive nodes form respectively and be distributed in this contact panel.Select these capacitive nodes of module and contact panel to be electrically connected, select module to choose the first capacitive node and the second capacitive node in these capacitive nodes, wherein contiguous the first capacitive node of the second capacitive node.The differential detection module is electrically connected with selecting module, and the differential detection module is selected the first capacitive node that module chooses and the capacitance difference between the second capacitive node in order to detect, and produces according to this touch sense signals.
In one embodiment, this contact panel is the projection type capacitance touch control panel.
In one embodiment, this contact panel comprises many directions X wires and many Y-direction wires, these many directions X wires and this many Y-direction wires are arranged each other and are latticed, and each these a plurality of capacitive node is corresponding to directions X wire wherein and a Y-direction wire and forming wherein.
In one embodiment, this selection module comprises first multiplex's selector switch and second multiplex's selector switch.Wherein this first multiplex (MUX) selector switch is coupled between this contact panel and this differential detection module, many directions X wires of this of this first multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this selects module select wherein a directions X wire and select wherein Y-direction wire from these many Y-direction wires from these many directions X wires by this first multiplex (MUX) selector switch, thus to choose this first capacitive node.Second multiplex's selector switch is coupled between this contact panel and this differential detection module, many directions X wires of this of this second multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this selects module select wherein a directions X wire and select wherein Y-direction wire from these many Y-direction wires from these many directions X wires by this second multiplex (MUX) selector switch, thus to choose this second capacitive node.
Another object of the present invention is to provide a kind of touch-control input device, it comprises contact panel, selects module and differential detection module.
According to an embodiment, contact panel comprises a plurality of capacitive nodes, and these capacitive nodes form respectively and be distributed in this contact panel.Select these capacitive nodes of module and contact panel to be electrically connected, selecting module to choose at least one capacitive node in these capacitive nodes forms the first capacitive node group and chooses at least one capacitive node formation the second capacitive node group, wherein capacitive node of contiguous the first capacitive node group of the capacitive node of the second capacitive node group.The differential detection module is electrically connected with selecting module, the first capacitive node group that differential detection module detection selection module is chosen and the total capacitance value difference between the second capacitive node group, and produce according to this touch sense signals.
In one embodiment, this contact panel is the projection type capacitance touch control panel.
In one embodiment, this contact panel comprises many directions X wires and many Y-direction wires, these many directions X wires and this many Y-direction wires are arranged each other and are latticed, and each these a plurality of capacitive node is corresponding to directions X wire wherein and a Y-direction wire and forming wherein.
In one embodiment, this selection module comprises first multiplex's selector switch and second multiplex's selector switch.Wherein first multiplex's selector switch is coupled between this contact panel and this differential detection module, many directions X wires of this of this first multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this selects module select wherein a directions X wire and select at least two Y-direction wires from these many Y-direction wires from these many directions X wires by this first multiplex (MUX) selector switch, chooses thus and form this first capacitive node group.Second multiplex's selector switch is coupled between this contact panel and this differential detection module, many directions X wires of this of this second multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this selects module select wherein a directions X wire and select at least two Y-direction wires from these many Y-direction wires from these many directions X wires by this second multiplex (MUX) selector switch, chooses thus and form this second capacitive node group.
In another embodiment, this selection module comprises first multiplex's selector switch and second multiplex's selector switch.Wherein first multiplex's selector switch is coupled between this contact panel and this differential detection module, many directions X wires of this of this first multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this selects module to select at least two directions X wires and select wherein Y-direction wire from these many Y-direction wires from these many directions X wires by this first multiplex (MUX) selector switch, chooses thus and form this first capacitive node group.Second multiplex's selector switch is coupled between this contact panel and this differential detection module, many directions X wires of this of this second multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this selects module to select at least two directions X wires and select wherein Y-direction wire from these many Y-direction wires from these many directions X wires by this second multiplex (MUX) selector switch, chooses thus and form this second capacitive node group.
In another embodiment, this selection module comprises first multiplex's selector switch and second multiplex's selector switch.Wherein this first multiplex (MUX) selector switch is coupled between this contact panel and this differential detection module, many directions X wires of this of this first multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this selects module to select at least two directions X wires and select at least two Y-direction wires from these many Y-direction wires from these many directions X wires by this first multiplex (MUX) selector switch, chooses thus and form this first capacitive node group.Second multiplex's selector switch is coupled between this contact panel and this differential detection module, many directions X wires of this of this second multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this selects module to select at least two directions X wires and select at least two Y-direction wires from these many Y-direction wires from these many directions X wires by this second multiplex (MUX) selector switch, chooses thus and form this second capacitive node group.
In another embodiment, this selection module comprises first multiplex's selector switch and second multiplex's selector switch.This first multiplex (MUX) selector switch is coupled between this contact panel and this differential detection module, many directions X wires of this of this first multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this selection module by this first multiplex (MUX) selector switch from these many directions X wires select one first directions X wires and should many Y-direction wire ground connection or sky connect, thus to choose all capacitive nodes that should the first directions X wire and to form this first capacitive node group.This second multiplex (MUX) selector switch, be coupled between this contact panel and this differential detection module, many directions X wires of this of this second multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this selection module by this second multiplex (MUX) selector switch from these many directions X wires select one second directions X wires and should many Y-direction wire ground connection or sky connect, thus to choose all capacitive nodes that should the second directions X wire and to form this second capacitive node group.
In another embodiment, this selection module comprises first multiplex's selector switch and second multiplex's selector switch.This first multiplex (MUX) selector switch is coupled between this contact panel and this differential detection module, many directions X wires of this of this first multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this selection module should many directions X wire ground connection by this first multiplex (MUX) selector switch or sky connects and select one first Y-direction wires from these many Y-direction wires, thus to choose all capacitive nodes that should the first Y-direction wire and to form this first capacitive node group.This second multiplex (MUX) selector switch is coupled between this contact panel and this differential detection module, many directions X wires of this of this second multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this selection module should many directions X wire ground connection by this second multiplex (MUX) selector switch or sky connects and select one second Y-direction wires from these many Y-direction wires, thus to choose all capacitive nodes that should the second Y-direction wire and to form this second capacitive node group.
In one embodiment, when this differential detection module detects this total capacitance value difference between this first capacitive node group and this second capacitive node group, this selection module is further chosen the first capacitive node and the second capacitive node from these a plurality of capacitive nodes of this first capacitive node group, this differential detection module further detects this first capacitive node that this selection module chooses and the capacitance difference between this second capacitive node, and produces according to this this touch sense signals.
Another object of the present invention is to provide a kind of touch control sensing circuit, touch control sensing circuit is applicable to contact panel, and contact panel comprises a plurality of capacitive nodes and forms and distribute thereon.
According to an embodiment, touch control sensing circuit comprises selects module and differential detection module.Select these capacitive nodes of module and contact panel to be electrically connected, select module to choose the first capacitive node and the second capacitive node in these capacitive nodes, wherein contiguous the first capacitive node of the second capacitive node.The differential detection module is electrically connected with selecting module, and the differential detection module is selected the first capacitive node that module chooses and the capacitance difference between the second capacitive node in order to detect, and produces according to this touch sense signals.
In one embodiment, the contact panel of this touch-control input device comprises many directions X wires and many Y-direction wires, and wherein this selection module comprises first multiplex's selector switch and second multiplex's selector switch.This first multiplex (MUX) selector switch is coupled between this contact panel and this differential detection module, many directions X wires of this of this first multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this selects module select wherein a directions X wire and select wherein Y-direction wire from these many Y-direction wires from these many directions X wires by this first multiplex (MUX) selector switch, thus to choose this first capacitive node.This second multiplex (MUX) selector switch, be coupled between this contact panel and this differential detection module, many directions X wires of this of this second multiplex (MUX) selector switch and this contact panel and this many Y-direction wires are electrically connected, this select module by this second multiplex (MUX) selector switch from these many directions X wires select wherein a directions X wire and from should many Y-direction wires selections Y-direction wire wherein, thus to choose this second capacitive node.
Can be further understood by the following detailed description and accompanying drawings about the advantages and spirit of the present invention.
Description of drawings
Fig. 1 shows the schematic diagram of a kind of contact panel in prior art.
Fig. 2 shows the schematic diagram of a kind of touch-control input device in prior art and touch control detection circuit thereof.
Fig. 3 shows the schematic diagram according to the touch-control input device in the first specific embodiment of the present invention.
Fig. 4 shows the schematic diagram according to the touch-control input device in the second specific embodiment of the present invention.
Embodiment
See also Fig. 3.Fig. 3 shows the schematic diagram according to the touch-control input device 3 in the first specific embodiment of the present invention.Touch-control input device 3 comprises contact panel 30 and corresponding touch control sensing circuit 32.Touch control sensing circuit 32 in this specific embodiment itself also can be made, and is widely used in the electronic system of various touch controllable functions, is not limited to the touch-control input device 3 in the present embodiment.
In this embodiment, contact panel 30 comprises many directions X wires (X1～Xm) and many Y-direction wires (Y1～Yn), directions X wire and Y-direction wire are arranged each other and are latticed, be level, be vertically staggered and form well word shape grid as X, Y-direction wire in Fig. 3, but the invention is not restricted to this, it is also applicable to the arrangement of conductor of other direction or angle.And form a capacitive node (300a, 300b, 300c in as Fig. 3) at each directions X wire and the staggered part of Y-direction wire.That is to say, contact panel comprises a plurality of capacitive nodes, respectively correspondence wherein directions X wire form and be distributed in this contact panel with Y-direction wire wherein, for example capacitive node 300a corresponds to directions X wire X3 and Y-direction wire Y3, and capacitive node 300b corresponds to directions X wire X3 and Y-direction wire Y2.In actual applications, contact panel can be the capacitance touching control panel of projection type capacitance touch control panel or other tool similarity.
As shown in Figure 3, touch control sensing circuit 32 comprises selection module 320 and differential detection module 322.Select module 320 and these capacitive nodes of contact panel 30 to be electrically connected.Differential detection module 322 is electrically connected with selecting module 320.
In this embodiment, select module 320 further to comprise first multiplex's selector switch 3202, second multiplex's selector switch 3204 and the control circuit 3200 in order to control above-mentioned multiplex's selector switch.First multiplex's selector switch 3202 and second multiplex's selector switch 3204 are respectively coupled between contact panel 30 and differential detection module 322.First multiplex's selector switch 3202 and second multiplex's selector switch 3204 respectively with the directions X wire of contact panel 30 (X1～Xm) and Y-direction wire (Y1～Yn) be electrically connected.
(X1～Xm) selects wherein a directions X wire and from these Y-direction wires (Y1～Yn) select wherein Y-direction wire, thus to choose a capacitive node (the first capacitive node) from these directions X wires to select module 320 can utilize control circuit 3200 to control first multiplex's selector switchs 3202.On the other hand, select module 320 also can utilize control circuit 3200 to control second multiplex's selector switch 3204, to choose another capacitive node (the second capacitive node).Differential detection module 322 can detect the capacitance difference between two capacitive nodes that this selection module 320 chooses, and produces according to this touch sense signals Soutput.
In actual applications, differential detection module 322 can comprise electric capacitance measurement unit and comparator unit, in order to calculate and to compare capacitance difference between capacitive node.
Below lifting an operational instances is illustrated, first multiplex's selector switch 3202 can select directions X wire X3 and Y-direction wire Y3 to choose capacitive node 300a, simultaneously, second multiplex's selector switch 3204 can select directions X wire X3 and Y-direction wire Y2 to choose capacitive node 300b.
In this operational instances, differential detection module 322 can calculate the capacitance difference between capacitive node 300a and capacitive node 300b.If this moment, there is external object to touch the position at capacitive node 300a place, make the capacitance of capacitive node 300a change, the capacitance difference that can detect between capacitive node 300a and contiguous capacitive node 300b by touch control sensing circuit 32 of the present invention is judged.
What need special instruction is, in the present invention, the second selected the second capacitive node of multiplex's selector switch 3204 (being capacitive node 300b in this example) of selecting module 320 through design to choose contiguous the first selected the first capacitive node of multiplex's selector switch 3202 (in this example as capacitive node 300a).The capacitance equivalence that thus, can utilize the second capacitive node is as the first capacitive node touched criterion whether.With the extra corresponding criterion as each capacitive node of capacitor array of comparing be set in prior art compare, the present invention utilizes the differential relation of two adjacent capacitive nodes to be used as producing the criterion of touch sense signals Soutput, can save quantity and the setup cost of circuit component and dwindle circuit area is set, thus reach now electronic installation lightening with the demand such as low power consumption.
In addition, select the relative position relation of the first capacitive node and the second capacitive node to be not restricted to aforesaid horizontal neighbouring relations (as capacitive node 300a, 300b).For example in another operational instances, vertical adjacent capacitive node 300a and capacitive node 300c can be selected, also similar effect can be reached.
Below by table 1 show touch-control input device 3 of the present invention Y-direction wire fix and testing process to different directions X wires in, select the selected X of module 320, the operational instances of Y-direction wire.(k is the positive integer between 1～n)
Table 1
| Time | 1 | 2 | 3 | … | m-1 |
| First multiplex's selector switch | X1，Yk | X2，Yk | X3，Yk | … | X m-1，Yk |
| Second multiplex's selector switch | X2，Yk | X3，Yk | X4，Yk | … | Xm，Yk |
By the flow process of table 1, can with once sense cycle on a specific Y-direction wire (Yk), carry out differential measurement to every two adjacent capacitive nodes respectively.
On the other hand, directions X wire is fixed and is as shown in table 2 below to the testing process of different Y-direction wires in touch-control input device 3 of the present invention.(k is the positive integer between 1～m)
Table 2
| Time | 1 | 2 | 3 | … | n-1 |
| First multiplex's selector switch | Xk，Y1 | Xk，Y2 | Xk，Y3 | … | Xk，Y n-1 |
| Second multiplex's selector switch | Xk，Y2 | Xk，Y3 | Xk，Y4 | … | Xk，Yn |
See also Fig. 4, Fig. 4 shows the schematic diagram according to the touch-control input device 5 in the second specific embodiment of the present invention.Compare with aforesaid the first specific embodiment of the present invention, touch-control input device 5 its maximum differences in the second specific embodiment are, the selection module 520 of touch-control input device 5 is to choose a plurality of capacitive nodes 50 all capacitive nodes to form the first capacitive node group from contact panel, and from contact panel 50 all capacitive nodes alternative get a plurality of capacitive nodes and form the second capacitive node group, the capacitive node of contiguous the first capacitive node group of the capacitive node of the second capacitive node group wherein.
In an operational instances, the selection module 520 of touch-control input device 5 is selected two directions X wires (X1, X2) and is selected a wherein Y-direction wire (Y3) from this Y-direction wire from this directions X wire by first multiplex's selector switch 5202, chooses thus two capacitive nodes (as capacitive node 500a, the 500b in Fig. 4) and forms the first capacitive node group 500s1.On the other hand, select module 520 to select two directions X wires (X3, X4) and select a wherein Y-direction wire (Y3) from this Y-direction wire from this directions X wire by second multiplex's selector switch 5204, choose thus two capacitive nodes (as capacitive node 500c, the 500d in Fig. 4) and form the second capacitive node group 500s2.Wherein the capacitive node of the second capacitive node group 500s2 is close to the capacitive node of the first capacitive node group 500s1.
The first capacitive node group 500s1 that differential detection module 522 detection selection modules 520 are chosen and the total capacitance value difference between the second capacitive node group 500s2, and carry out follow-up touch-control judgement.
When this differential detection module 522 detects total capacitance value difference between this first capacitive node group 500s1 and this second capacitive node group 500s2, touch-control input device 5 can carry out further judgement to differentiate in a plurality of capacitive nodes that the first capacitive node group 500s1 group is comprised, and is actually its corresponding extraneous contact best of which capacitive node.
Selecting module 520 further to choose respectively any two capacitive nodes from these a plurality of capacitive nodes of this first capacitive node group 500s1 progressively detects, choosing and detecting and with reference to the detailed step of the first specific embodiment, separately not give unnecessary details at this between any two capacitive nodes wherein.Differential detection module 522 can further judge the capacitance difference between capacitive node in the first capacitive node group 500s1, and produces according to this touch sense signals Soutput.
Below by table 3 and table 4 show touch-control input device 5 of the present invention Y-direction wire fix and testing process to different directions X wires in, select the selected X of module 520, the operational instances of Y-direction wire.(k is the positive integer between 1～n, and m is 2 multiple)
Table 3
| Time | 1 | 2 | 3 | … | (m/2)-1 |
| First multiplex's selector switch | X1+X2，Yk | X3+X4，Yk | X5+X6，Yk | … | X m-3+X m-2，Yk |
| Second multiplex's selector switch | X3+X4，Yk | X5+X6，Yk | X7+X8，Yk | … | X m-1+X m，Yk |
As shown in table 3, choose simultaneously two directions X wires by touch-control input device 5 of the present invention, make the one-time detection flow process approximately only need cycle of original 1/2 to complete, a cycle as shown in table 3 shortens to (m/2)-1.That is to say, the present invention can reach the effect that shortens sense cycle thus.
Pass through subsequently table 4, after his-and-hers watches 3 flow processs finish, the possible capacitive node group of judgement is done internal judgment again.For example, if be judged to be (X in table 3 flow process
2t+ X
2t+1, Yk) with (X
2t+1+ X
2t+2, Yk) these two groups of capacitive node group differences are maximum.
Table 4
| Time | 1 | 2 | 3 |
| First multiplex's selector switch | X 2t-1，Yk | X 2t，Yk | X 2t+1，Yk |
| Second multiplex's selector switch | X 2t，Yk | X 2t+1，Yk | X 2t+2，Yk |
In the second specific embodiment, touch-control input device 5 can by table 3 and two stage judgement shown in table 4, can corresponding extraneous touch-control input judge generation touch sense signals Soutput.In the second specific embodiment, other inner member of touch-control input device 5 and testing process details and the roughly the same part of the first specific embodiment are not separately given unnecessary details at this.
In sum, in touch-control input device 5 of the present invention, selected the first capacitive node group and the relative position relation of the capacitive node of this its composition of the second capacitive node group are not restricted to vertical adjacent 2 relations (as capacitive node 500a and 500b, capacitive node 500c and 500d) of Fig. 4.For example in another operational instances, the adjoining capacitive node of can comprise in each capacitive node group that level is adjacent, annular, square, oblique line or other geometric figure being arranged forms, the composition number of its capacitive node is not defined as two yet, also can be a plurality of capacitive nodes more than three or three, all can reach similar or detect faster the effect that judges.
What need special instruction is that multiplex's selector switch of selection module 520 is not limited to a selected Y-direction wire and two directions X wires in the second specific embodiment when choosing wire.Select module 520 can select respectively at least two Y-direction wires of a directions X wire collocation, at least two Y-direction wires of directions X wires collocation or at least two Y-direction wires of at least two directions X wires collocation, choose mode with corresponding different capacitive node group respectively.
In another operation is implemented, first multiplex's selector switch 5202 also can be selected (to select the first directions X wire (for example X3) in X1～Xm) and (ground connection of Y1～Yn) or sky connect, and form first capacitive node groups with all capacitive nodes of choosing corresponding directions X wire (on the X3 axle) thus with all Y-direction wires from the directions X wire.Second multiplex's selector switch 5204 also can be selected (to select the second directions X wire (for example X4) in X1～Xm) and (ground connection of Y1～Yn) or sky connect, and form second capacitive node groups with all capacitive nodes of choosing corresponding directions X wire (on the X4 axle) thus with all Y-direction wires from the directions X wire.
Or during another operation implemented, first multiplex's selector switch 5202 can (ground connection of X1～Xm) or sky connect, and on a corresponding Y-direction wire, all capacitive nodes form first capacitive node groups by choosing with all directions X wires.Second multiplex's selector switch 5204 also can (ground connection of X1～Xm) or sky connect, and form second capacitive node groups by all capacitive nodes of choosing corresponding another Y-direction wire with all directions X wires.
Compared with prior art, the present invention utilizes the differential relation of adjacent capacitor node or adjacent capacitive node group, as the criterion that produces touch sense signals.Can reach thus quantity and the setup cost of saving circuit component, dwindle circuit area and acceleration detection flow process texts are set, thereby reach now the demand such as the lightening and low power consumption of electronic installation.
By the detailed description of above preferred specific embodiment, be to wish more to know to describe feature of the present invention and spirit, and with above-mentioned disclosed preferred specific embodiment, scope of the present invention limited.On the contrary, its objective is that hope can and be equal to arrangement with various changes and be covered by in the scope of claims of the present invention.
The primary clustering symbol description
1,3,5: touch-control input device
10,30,50: contact panel
12,32,52: touch control sensing circuit
100a, 100b, 100c, 300a, 300b, 300c: capacitive node
500a, 500b, 500c: capacitive node
120: multiplex's selector switch
124: the comparison capacitor array
122,322,522: the differential detection module
320,520: select module
3202,5202: the first multiplex's selector switchs
3204,5204: the second multiplex's selector switchs
1200,3200,5200: control circuit
X1, X2, X3, X4, Xm:X direction wire
Y1, Y2, Y3, Y4, Yn:Y direction wire
Soutput: touch sense signals.
Claims (8)
1. touch-control input device comprises:
Contact panel, it comprises:
A plurality of capacitive nodes form and are distributed on described contact panel;
Select module, be electrically connected with described a plurality of capacitive nodes of described contact panel, described selection module is chosen a plurality of capacitive nodes and is formed the first capacitive node group and choose a plurality of capacitive nodes formation the second capacitive node group, the capacitive node of contiguous described the first capacitive node group of the capacitive node of wherein said the second capacitive node group in described a plurality of capacitive nodes; And
The differential detection module is electrically connected with described selection module, described the first capacitive node group that the described selection module of described differential detection module detection is chosen and the total capacitance value difference between described the second capacitive node group, and produce according to this first touch sense signals;
Wherein, described touch-control input device further judges according to described the first touch sense signals the position that touch-control occurs:
If judge that touch-control occurs in described the first capacitive node group, described selection module is further chosen respectively any two capacitive nodes and is progressively detected from a plurality of capacitive nodes of described the first capacitive node group, with the capacitance difference between capacitive node in definite described the first capacitive node group, and produce according to this second touch sense signals;
If judge that touch-control occurs in described the second capacitive node group, described selection module is further chosen respectively any two capacitive nodes and is progressively detected from a plurality of capacitive nodes of described the second capacitive node group, with the capacitance difference between capacitive node in definite described the second capacitive node group, and produce according to this 3rd touch sense signals.
2. touch-control input device according to claim 1, wherein, described contact panel is the projection type capacitance touch control panel.
3. touch-control input device according to claim 1, wherein, described contact panel comprises many directions X wires and many Y-direction wires, described many directions X wires and described many Y-direction wires are arranged each other and are latticed, and each described a plurality of capacitive node forms with a Y-direction wire wherein corresponding to directions X wire wherein.
4. touch-control input device according to claim 3, wherein, described selection module comprises:
First multiplex's selector switch, be coupled between described contact panel and described differential detection module, the described many directions X wires of described first multiplex's selector switch and described contact panel and described many Y-direction wires are electrically connected, described selection module is selected wherein a directions X wire and selects at least two Y-direction wires from described many Y-direction wires from described many directions X wires by described first multiplex's selector switch, chooses thus and form described the first capacitive node group; And
Second multiplex's selector switch, be coupled between described contact panel and described differential detection module, the described many directions X wires of described second multiplex's selector switch and described contact panel and described many Y-direction wires are electrically connected, described selection module is selected wherein a directions X wire and selects at least two Y-direction wires from described many Y-direction wires from described many directions X wires by described second multiplex's selector switch, chooses thus and form described the second capacitive node group.
5. touch-control input device according to claim 3, wherein, described selection module comprises:
First multiplex's selector switch, be coupled between described contact panel and described differential detection module, the described many directions X wires of described first multiplex's selector switch and described contact panel and described many Y-direction wires are electrically connected, described selection module is selected at least two directions X wires and is selected wherein Y-direction wire from described many Y-direction wires from described many directions X wires by described first multiplex's selector switch, chooses thus and form described the first capacitive node group; And
Second multiplex's selector switch, be coupled between described contact panel and described differential detection module, the described many directions X wires of described second multiplex's selector switch and described contact panel and described many Y-direction wires are electrically connected, described selection module is selected at least two directions X wires and is selected wherein Y-direction wire from described many Y-direction wires from described many directions X wires by described second multiplex's selector switch, chooses thus and form described the second capacitive node group.
6. touch-control input device according to claim 3, wherein, described selection module comprises:
First multiplex's selector switch, be coupled between described contact panel and described differential detection module, the described many directions X wires of described first multiplex's selector switch and described contact panel and described many Y-direction wires are electrically connected, described selection module is selected at least two directions X wires and is selected at least two Y-direction wires from described many Y-direction wires from described many directions X wires by described first multiplex's selector switch, chooses thus and form described the first capacitive node group; And
Second multiplex's selector switch, be coupled between described contact panel and described differential detection module, the described many directions X wires of described second multiplex's selector switch and described contact panel and described many Y-direction wires are electrically connected, described selection module is selected at least two directions X wires and is selected at least two Y-direction wires from described many Y-direction wires from described many directions X wires by described second multiplex's selector switch, chooses thus and form described the second capacitive node group.
7. touch-control input device according to claim 3, wherein, described selection module comprises:
First multiplex's selector switch, be coupled between described contact panel and described differential detection module, the described many directions X wires of described first multiplex's selector switch and described contact panel and described many Y-direction wires are electrically connected, described selection module is selected one first directions X wire and described many Y-direction wire ground connection or sky is connect from described many directions X wires by described first multiplex's selector switch, thus with all capacitive nodes of choosing described the first directions X wire of correspondence and form described the first capacitive node group; And
Second multiplex's selector switch, be coupled between described contact panel and described differential detection module, the described many directions X wires of described second multiplex's selector switch and described contact panel and described many Y-direction wires are electrically connected, described selection module is selected one second directions X wire and described many Y-direction wire ground connection or sky is connect from described many directions X wires by described second multiplex's selector switch, thus with all capacitive nodes of choosing described the second directions X wire of correspondence and form described the second capacitive node group.
8. touch-control input device according to claim 3, wherein, described selection module comprises:
First multiplex's selector switch, be coupled between described contact panel and described differential detection module, the described many directions X wires of described first multiplex's selector switch and described contact panel and described many Y-direction wires are electrically connected, described selection module by described first multiplex's selector switch with described many directions X wire ground connection or sky connects and select one first Y-direction wire from described many Y-direction wires, thus with all capacitive nodes of choosing corresponding described the first Y-direction wire and form described the first capacitive node group; And
Second multiplex's selector switch, be coupled between described contact panel and described differential detection module, the described many directions X wires of described second multiplex's selector switch and described contact panel and described many Y-direction wires are electrically connected, described selection module by described second multiplex's selector switch with described many directions X wire ground connection or sky connects and select one second Y-direction wire from described many Y-direction wires, thus with all capacitive nodes of choosing corresponding described the second Y-direction wire and form described the second capacitive node group.
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| CN 200910160004 CN101957699B (en) | 2009-07-15 | 2009-07-15 | Touch input device and touch sensing circuit |
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| CN 200910160004 CN101957699B (en) | 2009-07-15 | 2009-07-15 | Touch input device and touch sensing circuit |
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| KR101461157B1 (en) | 2011-04-18 | 2014-11-13 | 삼성디스플레이 주식회사 | touch screen system and driving method thereof |
| US9035752B2 (en) * | 2013-03-11 | 2015-05-19 | Amazon Technologies, Inc. | Force sensing input device under an unbroken exterior portion of a device |
| CN105117077A (en) * | 2014-03-21 | 2015-12-02 | 马维尔国际有限公司 | Method, device and touch component for determining touch area on touch panel |
| EP3182258B1 (en) * | 2014-09-03 | 2020-07-01 | Huawei Technologies Co. Ltd. | Terminal, terminal control device and method |
| CN114327161A (en) * | 2021-12-28 | 2022-04-12 | 北京集创北方科技股份有限公司 | Touch device and touch positioning method |
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| CN1797309A (en) * | 2004-12-27 | 2006-07-05 | 盛群半导体股份有限公司 | Interpretation method for touch controlled induction system |
| CN101339313A (en) * | 2007-07-03 | 2009-01-07 | 株式会社日立显示器 | Display device with touch panel |
| CN101408826A (en) * | 2008-11-17 | 2009-04-15 | 友达光电股份有限公司 | Sensing apparatus of capacitance touching control panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797309A (en) * | 2004-12-27 | 2006-07-05 | 盛群半导体股份有限公司 | Interpretation method for touch controlled induction system |
| CN101339313A (en) * | 2007-07-03 | 2009-01-07 | 株式会社日立显示器 | Display device with touch panel |
| CN101408826A (en) * | 2008-11-17 | 2009-04-15 | 友达光电股份有限公司 | Sensing apparatus of capacitance touching control panel |
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