CN102681738A - Multi-point touch identifying method and touch device for mutual capacitance type touch equipment - Google Patents
Multi-point touch identifying method and touch device for mutual capacitance type touch equipment Download PDFInfo
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- CN102681738A CN102681738A CN2012101360556A CN201210136055A CN102681738A CN 102681738 A CN102681738 A CN 102681738A CN 2012101360556 A CN2012101360556 A CN 2012101360556A CN 201210136055 A CN201210136055 A CN 201210136055A CN 102681738 A CN102681738 A CN 102681738A
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Abstract
The invention is applied to the field of electric digital data processing and provides a multi-point touch identifying method for mutual capacitance type touch equipment. The method comprises the following steps of: (A), catching contacts of touch action corresponding positions; (B), respectively analyzing contact combination relations of the touch action corresponding positions according to a plurality of combination rules, comparing with historical information and selecting a contact combination rule of a touch action corresponding position that a contact combination relation of the touch action corresponding position meets the historical information; (C), combining contacts of the touch action corresponding positions by using the contact combination rule of the touch action corresponding position, which meets the historical information; and (D), obtaining new contacts according to the combination and calculating a coordinate position of the touch action corresponding position. By technical characteristics that each contact combination relation is analyzed and compared with the historical information according to a plurality of combination rules so as to select the combination rule meeting the historical information and the contacts are combined, the identifying method has high identification accuracy without error.
Description
Technical field
The invention belongs to electric digital data processing field, relate in particular to a kind of capacitance touch equipment multiple point touching discrimination method and touching device.
Background technology
When generic finger touches capacitance plate; The electric field of surface capacitance changes the corresponding induced signal of triggering; Can be come out by identification in the intensity and the position that cause touching, the variation shape of signal (with reference to figure 1) when ground connection is good, and the center that promptly is considered to current touch above the peak value of presetting the touch threshold signal is the contact; Calculate the coordinate position of touch according to the contact, i.e. popular centroid algorithm in the capacitance plate drive software at present.During imperfect earth, touch signal becomes in no longer desirable (with reference to figure 2), and larger area touches (touching like thumb) and is prone to two or above contact, then draws two or above coordinate position easily according to classic method.Need a kind of mechanism this moment, can a stable contact be merged in some contacts of these appearance, simultaneously, do not influence two identifications when depending near the touch.Popular (with reference to figure 3) can touch than large tracts of land and stablize identification one-tenth a bit at present, and the probability that is mistaken for some when then multiple spot is near touch is high; Can multiple spot truly be recognized as multiple spot near touching, then larger area touches and also is mistaken for multiple spot easily.Show low, the easy erroneous judgement of the accurate identification of touch of mutual capacitance touch apparatus multiple point touching discrimination method in the prior art in sum, experienced not good defective when touching continuously.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of multiple point touching discrimination method of mutual capacitance type touch apparatus, is intended to solve accurately low, the easy erroneous judgement of identification in the prior art, the continuous not good technical matters of experience that touches.
The embodiment of the invention is achieved in that a kind of multiple point touching discrimination method of mutual capacitance type touch apparatus, said method comprising the steps of:
The contact of A, seizure touch action correspondence position;
B, utilize and a plurality ofly merge the contact that rule analyzes the touch action correspondence position respectively and merge relation, the comparison historical information, the contact of choosing the touch action correspondence position merges the contact that relation meets the touch action correspondence position of historical information and merges rule;
C, utilize the contact of the said touch action correspondence position that meets historical information to merge rule the contact of seizure touch action correspondence position is merged;
D, obtain new contact, calculate the coordinate position of touch action correspondence position according to merging.
Further technical scheme of the present invention is: may further comprise the steps in the said B step:
B1, the contact that utilizes a plurality of merging rules to analyze the touch action correspondence position respectively merge relation;
B2, the contact that will analyze the touch action correspondence position merge relation according to sorting apart from distance between the contact;
B3, comparison historical information, the contact that selects the touch action correspondence position merges the contact merging rule that relation meets the touch action correspondence position of historical information;
Said distance is the distance of two touch contacts; In rectangular coordinate system, be expressed as the quadratic sum of absolute value of difference of absolute value and ordinate of the difference of two touch contact horizontal ordinates, or the absolute value sum of the difference of the absolute value of the further approximate difference that is reduced to two touch contact horizontal ordinates and ordinate.
Further technical scheme of the present invention is: further comprising the steps of after the said step B, before the C:
The contact merging of judging said touch action correspondence position concerns that the contact of the touch action correspondence position that meets historical information merges rule and whether has a plurality of;
When a plurality of, select all to merge that contact spacing concerns that from nearest merging the contact of pairing touch action correspondence position merges rule in the relation.
Further technical scheme of the present invention is: a plurality of contacts merge rule and comprise strong rule set and general rule collection among the said step B;
Said strong rule set is the functional operation value of first vegetarian refreshments in centre position, two contacts, and the preset ratio greater than the functional operation value of said two contacts should merge this two contacts;
Said general rule collection is that two contact enclosing region all elements values meet specific characteristic, should merge this two contacts;
Said specific characteristic is in two contact enclosing region, and the functional operation value of corresponding element vegetarian refreshments surpasses the preset ratio of the functional operation value of said two contacts.
Further technical scheme of the present invention is: described strong rule set is contained the mathematical feature of a plurality of touches.Described general rule collection is contained the mathematical feature of a plurality of touches.
Described data characteristics is to touch when taking place, and the signal that is reflected on the capacitance plate changes.
Another purpose of the embodiment of the invention is to provide a kind of capacitance touch equipment multiple point touching device for identifying, and this device comprises:
Search module is used to catch the contact of touch action correspondence position;
Analyze the contrast module; Be used to utilize a plurality of contact merging relations that rule analyzes the touch action correspondence position respectively that merge; The comparison historical information, the contact of choosing the touch action correspondence position merges the contact merging rule that relation meets the touch action correspondence position of historical information;
Merge module, be used to utilize the said contact that meets the touch action correspondence position of historical information to merge regular contact and merge seizure touch action correspondence position;
Computing module is used for obtaining new contact according to merging, calculates the coordinate position of touch action correspondence position.
Further technical scheme of the present invention is: said analysis contrast module comprises with lower module:
Analysis module is used to utilize a plurality of contact merging relations that rule analyzes the touch action correspondence position respectively that merge;
Merge and concern order module, be used for the contact that analyzes the touch action correspondence position is merged relation according to sorting apart from distance between the contact;
Information contrast module, the contact that is used to select the touch action correspondence position merge the contact that relation meets the touch action correspondence position of historical information and merge rule.
Further technical scheme of the present invention is: merge between the module and also comprise with lower module in said analyses and comparison module, contact:
Merge and concern statistical module, be used to judge that the contact merging of said touch action correspondence position concerns that the contact of the touch action correspondence position that meets historical information merges rule and whether has a plurality of;
Merge rule and select module, be used for when a plurality of, select all to merge that contact spacing concerns that from nearest merging the contact of pairing touch action correspondence position merges rule in the relation.
Utilize a plurality of merging rules; Analyzing touch action correspondence position contact merges relation and compares with historical information; Select the merging rule that meets historical information; The contact is merged the technical characterictic that obtains new contact, thus make the accurate identification of this discrimination method high, be difficult for erroneous judgement, experience when touching continuously good.Existing other technologies and scheme under identical mutual capacitance type touch screen structure, are difficult to the touch identification level that reaches identical with the present invention.
Description of drawings
Fig. 1 is prior art mutual capacitance type touch apparatus ground signalling touch signal variation diagram when good;
Fig. 2 is prior art mutual capacitance type touch apparatus ground signalling touch signal variation diagram when bad;
Fig. 3 is the schematic diagram of prior art mutual capacitance type touch apparatus contact identification classic method;
Fig. 4 is that mutual capacitance type touch apparatus of the present invention touches the discrimination method process flow diagram;
Fig. 5 is the structure principle chart that mutual capacitance type touch apparatus of the present invention touches discrimination method;
Fig. 6 is a strong rule set schematic diagram in the multiple point touching discrimination method of mutual capacitance type touch apparatus of the present invention;
Fig. 7 is general rule collection schematic diagram and a special characteristic schematic diagram in the multiple point touching discrimination method of mutual capacitance type touch apparatus of the present invention;
Fig. 8 is horizontal/vertically schematic diagram of data characteristics in the multiple point touching discrimination method of mutual capacitance type touch apparatus of the present invention;
Fig. 9 is the oblique schematic diagram of data characteristics in the multiple point touching discrimination method of mutual capacitance type touch apparatus of the present invention;
Figure 10 is a data characteristics square schematic diagram in the multiple point touching discrimination method of mutual capacitance type touch apparatus of the present invention;
Figure 11 be in the multiple point touching discrimination method of mutual capacitance type touch apparatus of the present invention 3 touch and merge schematic diagrams;
Figure 12 be in the multiple point touching discrimination method of mutual capacitance type touch apparatus of the present invention 4 touch and merge schematic diagrams;
Figure 13 is that the continuous touch and the classic method of the multiple point touching discrimination method of mutual capacitance type touch apparatus of the present invention touches comparison diagram continuously.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 4 shows the flow process of the multiple point touching discrimination method of the capacitance touch equipment that the embodiment of the invention provides, and details are as follows:
In step S101,, catch all contacts that surpass preset touch threshold according to the variation of the induced signal of touch action correspondence position.
In step S102; A plurality of merging preset when utilizing design are regular, analyze respectively capturing the corresponding contact of touch action, obtain the merging relation between each contact; These are merged relation according to putting in order apart from distance between the contact; And compare with historical information, select each contact and merge the merging rule contact that relation meets historical information, the merging rule of other merging relation neglects; The merging rule that merges relation when the contact selected has when a plurality of, selects the merging rule of contact spacing from nearest merging relation.Preset a plurality of contacts merge rule and comprise strong rule set and general rule collection, contain a plurality of different data characteristicses in each rule set.
Said strong rule set is the functional operation value of first vegetarian refreshments in centre position, two contacts, and the preset ratio greater than the functional operation value of said two contacts should merge this two contacts.Like two contacts is respectively contact A (2,2), contact B (4,5), considers the element value of Pa (3,3) and Pb (3,4) position, if these two element values should merge contact A and contact B all above the preset ratio of the functional operation value of two contacts.Can be expressed as with general mathematical linguistics: if f [Pa (3,3) and Pb (3,4)]
>F ' (contact A, contact B) then thinks to merge (with reference to figure 6).Function f and f ' can be linear functions, like summation/weighted sum, can be nonlinear functions, like maximizing, can be nonlinear functions also, like product or the like.
The general rule collection is that two contact enclosing region all elements values meet specific characteristic, should merge this two contacts.Surpass two contact position element value sums like all place value element value sums of enclosing region, consider Pa (2,3), Pb (2,4), Pee (2; 5), Pd (3,2), Pc (3,3), Pcc (3; 4), Pdd (3,5), Pe (4,2) Paa (4; 3), Pbb (4,4) position element value if these element value sums surpass the functional operation value of contact A, contact B, is then thought to merge (with reference to figure 7).
Specific characteristic is in two contact enclosing region, and the functional operation value of corresponding element vegetarian refreshments surpasses the preset ratio of the functional operation value of said two contacts.Be meant contact A like 50%, two contact, contact B, correspondence position is meant Pa-Paa, Pb-Pbb, Pc-Pcc, Pd-Pdd, Pe-Pee occurs in the rectangular area each other in pairs, is produced respectively by two contacts.If f [(Pa+Paa), (Pb+Pbb), (Pc+Pcc), (Pd+Pdd), (Pe+Pee)]>f ' (contact A, contact B), think that then this regional numerical value meets specific characteristic, should merge contact A and contact B.Function f and f ' can be linear functions, like summation, can be nonlinear functions, like maximizing, also can be nonlinear functions, like product or the like (with reference to figure 7).
Data characteristics is to touch when taking place, and the signal that is reflected on the capacitance plate changes.Data characteristics comprises laterally/vertically touchs, oblique touch, square touch etc.
Laterally/vertically touch: consideration be contact A and the numerical value of six points in B centre; Middle six some Pa, Pb, Pc; Paa; Pbb, the correspondence position element value sum of Pcc adds the element value sum of upper contact B correspondence position greater than the element value of contact A correspondence position, thinks that contact A and contact B can merge (with reference to figure 8).
Oblique touch: consideration be two some Pc in the middle of contact A and the B, Pcc numerical value will be respectively greater than the preset ratio like contact A and contact B functional operation value, and six some Pa on every side; Pb; Pd, Paa, Pbb; The correspondence position element value sum of Pdd adds the element value sum of upper contact B correspondence position greater than the element value of contact A correspondence position, thinks that contact A and contact B can merge (with reference to figure 9).
Square touches: consideration be contact A and the numerical value of B centre Pc is greater than predetermined threshold value; While Pa; Pb; Paa, the correspondence position element value sum of Pbb is greater than contact A correspondence position element value and adds upper contact B correspondence position element value sum, thinks that contact A and contact B can merge (with reference to Figure 10).
All meet above-mentioned three shapes generally though it should be noted that the data characteristics of touch, not only terminate in this; Maybe be bigger such as scope; Comprise more element, Fig. 8, Fig. 9, Figure 10 just illustrate, and do not represent the present invention only to handle to these three data characteristics.
Said distance is the distance of two touch contacts; In rectangular coordinate system, be expressed as the quadratic sum of absolute value of difference of absolute value and ordinate of the difference of two touch contact horizontal ordinates, or the absolute value sum of the difference of the absolute value of the further approximate difference that is reduced to two touch contact horizontal ordinates and ordinate.
In step S103, utilize the merging rule of the merging relation of selecting that meets historical information most, merge capturing all contacts that surpass preset touch threshold.
The information that historical information prestores when comprising touch information record and design once.This paper mainly refers to touch information record once; The information that the touch in past brings; Exist two a finger to touch and never interrupted; Though currently have two touch contacts that can merge, algorithm still tends to keep the independence of these two contacts, rather than with the two merging.The information that deposits in during design is the reference to the empirical parameter of touch-screen research, and the information that deposits in during design obtains upgrading along with the increase of touch information record once.
In step S104,, calculate according to these element values and touch corresponding coordinate position merging a plurality of element values that obtain among the S103.
With reference to accompanying drawing 4, the multiple point touching device for identifying of this capacitance touch equipment provided by the invention, this device comprises: search module, analysis contrast module, merging module, computing module.
It is specific as follows that analysis contrast module 20 is done the process that the contact is analyzed and the merging relation is compared: analysis module 201, utilize a plurality of contact merging relations that rule analyzes the touch action correspondence position respectively that merge; Merge and concern order module 202, the contact that analyzes the touch action correspondence position is merged relation according to sorting apart from distance between the contact; Information contrast module 203, the contact that selects the touch action correspondence position merges the contact merging rule that relation meets the touch action correspondence position of historical information.
Between analyses and comparison module, merging module, also comprise: merge and concern statistical module, merge rule selection module.Merge and concern statistical module 61, judge that the contact merging of said touch action correspondence position concerns that the contact of the touch action correspondence position that meets historical information merges rule and whether has a plurality of; Merge rule and select module 62, when a plurality of, select all to merge that contact spacing concerns that from nearest merging the contact of pairing touch action correspondence position merges rule in the relation.
For the ease of saying something, illustrate as follows:
When no any history touches, use all merging regular, the current some touch contacts that search out are analyzed, the amalgamation result that obtains is final amalgamation result.Because have no historical information, have no way of with reference to judging.
When historical the touch arranged, 3 touches were arranged like the past, 4 touches of current discovery supposes to have two combinations and rule, and rule 1 is to the contact of close together, and rule 2 is to apart from contact far away.Rule 1 finds that A and B can merge, and C and D can merge, and always has two independent touches, and rule 2 finds that B and D can merge; And A, C is respectively independent touch, contrasts historical information (3 touches) this moment; Rule 1 provides the result of 2 touches, and rule 2 provides the result of 3 touches, therefore accepts and believe the result of rule 2; B and D merge, and A and C are independent, the result of ignore rule 1 (with reference to Figure 12)
There are two contacts that touch correspondence position in past, does not merge, and is judged as independently two touches; Occurred three contacts that touch correspondence position now, supposed current have two combinations and rule, according to rule 1; B and C can merge into a touch, and A is independent touch, according to rule 2; A and B can merge into a touch, and C is independent touch.Two groups of rules have all provided the amalgamation result consistent with account of the history.But because the contact distance each other that can merge in the rule 1 is nearer, so take the merging method in the rule 1, B and C merge, and A keeps independent (with reference to Figure 11).In like manner, if there are three touches in the past,, keep three contact independence separately though so current have the rule that can merge, but still tend to believe historical information.
On the different electronic equipment that has the mutual capacitance type touch-screen of several moneys, test, the result is following: the effect when thumb is stablized setting-out behind the continuous line segment representative of black use the present invention is recognized as single-point touches and steady and continuous.When the same setting-out data of classic method identification are used in black discrete point representative, two even three touches of often quoting, result chaotic and unstable (with reference to Figure 13).
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the multiple point touching discrimination method of a mutual capacitance type touch apparatus is characterized in that, said method comprising the steps of:
The contact of A, seizure touch action correspondence position;
B, utilize and a plurality ofly merge the contact that rule analyzes the touch action correspondence position respectively and merge relation, the comparison historical information, the contact of choosing the touch action correspondence position merges the contact that relation meets the touch action correspondence position of historical information and merges rule;
C, utilize the contact of the said touch action correspondence position that meets historical information to merge rule the contact of seizure touch action correspondence position is merged;
D, obtain new contact, calculate the coordinate position of touch action correspondence position according to merging.
2. according to claim
1The multiple point touching discrimination method of described mutual capacitance type touch apparatus is characterized in that, may further comprise the steps in the said B step:
B
1.Utilize a plurality of contact merging relations that rule analyzes the touch action correspondence position respectively that merge;
B
2.The contact that analyzes the touch action correspondence position is merged relation according to sorting apart from distance between the contact;
B
3.The comparison historical information, the contact that selects the touch action correspondence position merges the contact merging rule that relation meets the touch action correspondence position of historical information;
Said distance is the distance of two touch contacts; In rectangular coordinate system, be expressed as the quadratic sum of absolute value of difference of absolute value and ordinate of the difference of two touch contact horizontal ordinates, or the absolute value sum of the difference of the absolute value of the further approximate difference that is reduced to two touch contact horizontal ordinates and ordinate.
3. according to claim
2The multiple point touching discrimination method of described mutual capacitance type touch apparatus is characterized in that, and is further comprising the steps of after said step B, before the C:
The contact merging of judging said touch action correspondence position concerns that the contact of the touch action correspondence position that meets historical information merges rule and whether has a plurality of;
When a plurality of, select all to merge that contact spacing concerns that from nearest merging the contact of pairing touch action correspondence position merges rule in the relation.
4. according to claim
1The multiple point touching discrimination method of described mutual capacitance type touch apparatus is characterized in that, a plurality of contacts merge rule and comprise strong rule set and general rule collection among the said step B;
Said strong rule set is the functional operation value of first vegetarian refreshments in centre position, two contacts, and the preset ratio greater than the functional operation value of said two contacts should merge this two contacts;
Said general rule collection is that two contact enclosing region all elements values meet specific characteristic, should merge this two contacts;
Said specific characteristic is in two contact enclosing region, and the functional operation value of corresponding element vegetarian refreshments surpasses the preset ratio of the functional operation value of said two contacts.
5. according to claim
4The multiple point touching discrimination method of described mutual capacitance type touch apparatus is characterized in that described strong rule set is contained the data characteristics of a plurality of touches;
Described data characteristics is to touch when taking place, and the signal that is reflected on the capacitance plate changes.
6. according to claim
4The multiple point touching discrimination method of described mutual capacitance type touch apparatus is characterized in that described general rule collection is contained the data characteristics of a plurality of touches;
Described data characteristics is to touch when taking place, and the signal that is reflected on the capacitance plate changes.
7. a mutual capacitance type touch apparatus multiple point touching device for identifying is characterized in that, comprising:
Search module is used to catch the contact of touch action correspondence position;
Analyze the contrast module; Be used to utilize a plurality of contact merging relations that rule analyzes the touch action correspondence position respectively that merge; The comparison historical information, the contact of choosing the touch action correspondence position merges the contact merging rule that relation meets the touch action correspondence position of historical information;
Merge module, be used to utilize the said contact that meets the touch action correspondence position of historical information to merge regular contact and merge seizure touch action correspondence position;
Computing module is used for obtaining new contact according to merging, calculates the coordinate position of touch action correspondence position.
8. according to claim
7Described mutual capacitance type touch apparatus multiple point touching device for identifying is characterized in that, said analysis contrast module comprises with lower module:
Analysis module is used to utilize a plurality of contact merging relations that rule analyzes the touch action correspondence position respectively that merge;
Merge and concern order module, be used for the contact that analyzes the touch action correspondence position is merged relation according to sorting apart from distance between the contact;
Information contrast module, the contact that is used to select the touch action correspondence position merge the contact that relation meets the touch action correspondence position of historical information and merge rule.
9. according to claim
7Described mutual capacitance type touch apparatus multiple point touching device for identifying is characterized in that, between said analyses and comparison module, merging module, also comprises with lower module:
Merge and concern statistical module, be used to judge that the contact merging of said touch action correspondence position concerns that the contact of the touch action correspondence position that meets historical information merges rule and whether has a plurality of;
Merge rule and select module, be used for when a plurality of, select all to merge that contact spacing concerns that from nearest merging the contact of pairing touch action correspondence position merges rule in the relation.
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